/*
  * utils for libavcodec

  * Copyright (c) 2001 Fabrice Bellard

  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>

  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.

  *

  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 /**

  * @file

  * utils.
  */

 #include "config.h"

 #include "libavutil/atomic.h"

 #include "libavutil/attributes.h"

 #include "libavutil/avassert.h"

 #include "libavutil/avstring.h"

 #include "libavutil/bprint.h"

 #include "libavutil/channel_layout.h"

 #include "libavutil/crc.h"

 #include "libavutil/frame.h"

 #include "libavutil/internal.h"

 #include "libavutil/mathematics.h"

 #include "libavutil/pixdesc.h"

 #include "libavutil/imgutils.h"
 #include "libavutil/samplefmt.h"

 #include "libavutil/dict.h"

 #include "avcodec.h"

 #include "dsputil.h"

 #include "libavutil/opt.h"

 #include "thread.h"

 #include "frame_thread_encoder.h"

 #include "internal.h"

 #include "bytestream.h"

 #include "version.h"

 #include <stdlib.h>

 #include <stdarg.h>

 #include <limits.h>

 #include <float.h>

 #if CONFIG_ICONV

 # include <iconv.h>
 #endif

 #if HAVE_PTHREADS
 #include <pthread.h>
 #elif HAVE_W32THREADS
 #include "compat/w32pthreads.h"
 #elif HAVE_OS2THREADS
 #include "compat/os2threads.h"
 #endif
 
 #if HAVE_PTHREADS || HAVE_W32THREADS || HAVE_OS2THREADS
 static int default_lockmgr_cb(void **arg, enum AVLockOp op)
 {
     void * volatile * mutex = arg;
     int err;
 
     switch (op) {
     case AV_LOCK_CREATE:
         return 0;
     case AV_LOCK_OBTAIN:
         if (!*mutex) {
             pthread_mutex_t *tmp = av_malloc(sizeof(pthread_mutex_t));
             if (!tmp)
                 return AVERROR(ENOMEM);
             if ((err = pthread_mutex_init(tmp, NULL))) {
                 av_free(tmp);
                 return AVERROR(err);
             }
             if (avpriv_atomic_ptr_cas(mutex, NULL, tmp)) {
                 pthread_mutex_destroy(tmp);
                 av_free(tmp);
             }
         }
 
         if ((err = pthread_mutex_lock(*mutex)))
             return AVERROR(err);
 
         return 0;
     case AV_LOCK_RELEASE:
         if ((err = pthread_mutex_unlock(*mutex)))
             return AVERROR(err);
 
         return 0;
     case AV_LOCK_DESTROY:
         if (*mutex)
             pthread_mutex_destroy(*mutex);
         av_free(*mutex);
         avpriv_atomic_ptr_cas(mutex, *mutex, NULL);
         return 0;
     }
     return 1;
 }
 static int (*lockmgr_cb)(void **mutex, enum AVLockOp op) = default_lockmgr_cb;
 #else
 static int (*lockmgr_cb)(void **mutex, enum AVLockOp op) = NULL;
 #endif
 
 

 volatile int ff_avcodec_locked;

 static int volatile entangled_thread_counter = 0;

 static void *codec_mutex;

 static void *avformat_mutex;

 #if CONFIG_RAISE_MAJOR
 #    define LIBNAME "LIBAVCODEC_155"
 #else
 #    define LIBNAME "LIBAVCODEC_55"
 #endif
 

 #if FF_API_FAST_MALLOC && CONFIG_SHARED && HAVE_SYMVER

 FF_SYMVER(void*, av_fast_realloc, (void *ptr, unsigned int *size, size_t min_size), LIBNAME)

 {

     return av_fast_realloc(ptr, size, min_size);

 }

 FF_SYMVER(void, av_fast_malloc, (void *ptr, unsigned int *size, size_t min_size), LIBNAME)

 {

     av_fast_malloc(ptr, size, min_size);

 }

 #endif

 static inline int ff_fast_malloc(void *ptr, unsigned int *size, size_t min_size, int zero_realloc)

 {
     void **p = ptr;
     if (min_size < *size)

         return 0;

     min_size = FFMAX(17 * min_size / 16 + 32, min_size);

     av_free(*p);

     *p = zero_realloc ? av_mallocz(min_size) : av_malloc(min_size);

     if (!*p)
         min_size = 0;
     *size = min_size;

     return 1;
 }
 
 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
 {
     uint8_t **p = ptr;
     if (min_size > SIZE_MAX - FF_INPUT_BUFFER_PADDING_SIZE) {

         av_freep(p);

         *size = 0;
         return;
     }
     if (!ff_fast_malloc(p, size, min_size + FF_INPUT_BUFFER_PADDING_SIZE, 1))
         memset(*p + min_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

 }
 

 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
 {
     uint8_t **p = ptr;
     if (min_size > SIZE_MAX - FF_INPUT_BUFFER_PADDING_SIZE) {
         av_freep(p);
         *size = 0;
         return;
     }
     if (!ff_fast_malloc(p, size, min_size + FF_INPUT_BUFFER_PADDING_SIZE, 1))
         memset(*p, 0, min_size + FF_INPUT_BUFFER_PADDING_SIZE);
 }
 

 /* encoder management */

 static AVCodec *first_avcodec = NULL;

 static AVCodec **last_avcodec = &first_avcodec;

 AVCodec *av_codec_next(const AVCodec *c)
 {

     if (c)
         return c->next;
     else
         return first_avcodec;

 }
 

 static av_cold void avcodec_init(void)

 {
     static int initialized = 0;
 
     if (initialized != 0)
         return;
     initialized = 1;
 

     if (CONFIG_DSPUTIL)
         ff_dsputil_static_init();

 }
 

 int av_codec_is_encoder(const AVCodec *codec)

 {

     return codec && (codec->encode_sub || codec->encode2);

 }
 

 int av_codec_is_decoder(const AVCodec *codec)

 {
     return codec && codec->decode;
 }
 

 av_cold void avcodec_register(AVCodec *codec)

 {
     AVCodec **p;

     avcodec_init();

     p = last_avcodec;

     codec->next = NULL;

 
     while(*p || avpriv_atomic_ptr_cas((void * volatile *)p, NULL, codec))

         p = &(*p)->next;

     last_avcodec = &codec->next;

 
     if (codec->init_static_data)
         codec->init_static_data(codec);

 }
 

 #if FF_API_EMU_EDGE

 unsigned avcodec_get_edge_width(void)
 {
     return EDGE_WIDTH;
 }

 #endif

 #if FF_API_SET_DIMENSIONS

 void avcodec_set_dimensions(AVCodecContext *s, int width, int height)
 {

     int ret = ff_set_dimensions(s, width, height);
     if (ret < 0) {
         av_log(s, AV_LOG_WARNING, "Failed to set dimensions %d %d\n", width, height);
     }

 }
 #endif
 
 int ff_set_dimensions(AVCodecContext *s, int width, int height)
 {
     int ret = av_image_check_size(width, height, 0, s);
 
     if (ret < 0)
         width = height = 0;

     s->coded_width  = width;
     s->coded_height = height;

     s->width        = FF_CEIL_RSHIFT(width,  s->lowres);
     s->height       = FF_CEIL_RSHIFT(height, s->lowres);

 
     return ret;

 }
 

 int ff_side_data_update_matrix_encoding(AVFrame *frame,
                                         enum AVMatrixEncoding matrix_encoding)
 {
     AVFrameSideData *side_data;
     enum AVMatrixEncoding *data;
 
     side_data = av_frame_get_side_data(frame, AV_FRAME_DATA_MATRIXENCODING);
     if (!side_data)
         side_data = av_frame_new_side_data(frame, AV_FRAME_DATA_MATRIXENCODING,
                                            sizeof(enum AVMatrixEncoding));
 
     if (!side_data)
         return AVERROR(ENOMEM);
 
     data  = (enum AVMatrixEncoding*)side_data->data;
     *data = matrix_encoding;
 
     return 0;
 }
 

 #if HAVE_NEON || ARCH_PPC || HAVE_MMX

 #   define STRIDE_ALIGN 16
 #else
 #   define STRIDE_ALIGN 8
 #endif
 

 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
                                int linesize_align[AV_NUM_DATA_POINTERS])
 {
     int i;

     int w_align = 1;
     int h_align = 1;

     switch (s->pix_fmt) {

     case AV_PIX_FMT_YUV420P:
     case AV_PIX_FMT_YUYV422:
     case AV_PIX_FMT_UYVY422:
     case AV_PIX_FMT_YUV422P:
     case AV_PIX_FMT_YUV440P:
     case AV_PIX_FMT_YUV444P:

     case AV_PIX_FMT_GBRAP:

     case AV_PIX_FMT_GBRP:
     case AV_PIX_FMT_GRAY8:
     case AV_PIX_FMT_GRAY16BE:
     case AV_PIX_FMT_GRAY16LE:
     case AV_PIX_FMT_YUVJ420P:
     case AV_PIX_FMT_YUVJ422P:
     case AV_PIX_FMT_YUVJ440P:
     case AV_PIX_FMT_YUVJ444P:
     case AV_PIX_FMT_YUVA420P:

     case AV_PIX_FMT_YUVA422P:
     case AV_PIX_FMT_YUVA444P:

     case AV_PIX_FMT_YUV420P9LE:
     case AV_PIX_FMT_YUV420P9BE:
     case AV_PIX_FMT_YUV420P10LE:
     case AV_PIX_FMT_YUV420P10BE:

     case AV_PIX_FMT_YUV420P12LE:
     case AV_PIX_FMT_YUV420P12BE:
     case AV_PIX_FMT_YUV420P14LE:
     case AV_PIX_FMT_YUV420P14BE:

     case AV_PIX_FMT_YUV420P16LE:
     case AV_PIX_FMT_YUV420P16BE:

     case AV_PIX_FMT_YUVA420P9LE:
     case AV_PIX_FMT_YUVA420P9BE:
     case AV_PIX_FMT_YUVA420P10LE:
     case AV_PIX_FMT_YUVA420P10BE:
     case AV_PIX_FMT_YUVA420P16LE:
     case AV_PIX_FMT_YUVA420P16BE:

     case AV_PIX_FMT_YUV422P9LE:
     case AV_PIX_FMT_YUV422P9BE:
     case AV_PIX_FMT_YUV422P10LE:
     case AV_PIX_FMT_YUV422P10BE:

     case AV_PIX_FMT_YUV422P12LE:
     case AV_PIX_FMT_YUV422P12BE:
     case AV_PIX_FMT_YUV422P14LE:
     case AV_PIX_FMT_YUV422P14BE:

     case AV_PIX_FMT_YUV422P16LE:
     case AV_PIX_FMT_YUV422P16BE:

     case AV_PIX_FMT_YUVA422P9LE:
     case AV_PIX_FMT_YUVA422P9BE:

     case AV_PIX_FMT_YUVA422P10LE:
     case AV_PIX_FMT_YUVA422P10BE:

     case AV_PIX_FMT_YUVA422P16LE:
     case AV_PIX_FMT_YUVA422P16BE:

     case AV_PIX_FMT_YUV444P9LE:
     case AV_PIX_FMT_YUV444P9BE:
     case AV_PIX_FMT_YUV444P10LE:
     case AV_PIX_FMT_YUV444P10BE:

     case AV_PIX_FMT_YUV444P12LE:
     case AV_PIX_FMT_YUV444P12BE:
     case AV_PIX_FMT_YUV444P14LE:
     case AV_PIX_FMT_YUV444P14BE:

     case AV_PIX_FMT_YUV444P16LE:
     case AV_PIX_FMT_YUV444P16BE:

     case AV_PIX_FMT_YUVA444P9LE:
     case AV_PIX_FMT_YUVA444P9BE:
     case AV_PIX_FMT_YUVA444P10LE:
     case AV_PIX_FMT_YUVA444P10BE:

     case AV_PIX_FMT_YUVA444P16LE:
     case AV_PIX_FMT_YUVA444P16BE:

     case AV_PIX_FMT_GBRP9LE:
     case AV_PIX_FMT_GBRP9BE:
     case AV_PIX_FMT_GBRP10LE:
     case AV_PIX_FMT_GBRP10BE:

     case AV_PIX_FMT_GBRP12LE:
     case AV_PIX_FMT_GBRP12BE:
     case AV_PIX_FMT_GBRP14LE:
     case AV_PIX_FMT_GBRP14BE:

         w_align = 16; //FIXME assume 16 pixel per macroblock
         h_align = 16 * 2; // interlaced needs 2 macroblocks height

         break;

     case AV_PIX_FMT_YUV411P:

     case AV_PIX_FMT_YUVJ411P:

     case AV_PIX_FMT_UYYVYY411:

         w_align = 32;
         h_align = 8;

         break;

     case AV_PIX_FMT_YUV410P:

         if (s->codec_id == AV_CODEC_ID_SVQ1) {
             w_align = 64;
             h_align = 64;

         }

         break;

     case AV_PIX_FMT_RGB555:

         if (s->codec_id == AV_CODEC_ID_RPZA) {
             w_align = 4;
             h_align = 4;

         }

         break;

     case AV_PIX_FMT_PAL8:
     case AV_PIX_FMT_BGR8:
     case AV_PIX_FMT_RGB8:

         if (s->codec_id == AV_CODEC_ID_SMC ||
             s->codec_id == AV_CODEC_ID_CINEPAK) {

             w_align = 4;
             h_align = 4;

         }

         break;

     case AV_PIX_FMT_BGR24:

         if ((s->codec_id == AV_CODEC_ID_MSZH) ||
             (s->codec_id == AV_CODEC_ID_ZLIB)) {
             w_align = 4;
             h_align = 4;

         }

         break;
     case AV_PIX_FMT_RGB24:
         if (s->codec_id == AV_CODEC_ID_CINEPAK) {
             w_align = 4;
             h_align = 4;
         }

         break;

     default:

         w_align = 1;
         h_align = 1;

         break;
     }
 

     if (s->codec_id == AV_CODEC_ID_IFF_ILBM || s->codec_id == AV_CODEC_ID_IFF_BYTERUN1) {
         w_align = FFMAX(w_align, 8);

     }
 

     *width  = FFALIGN(*width, w_align);
     *height = FFALIGN(*height, h_align);

     if (s->codec_id == AV_CODEC_ID_H264 || s->lowres)

         // some of the optimized chroma MC reads one line too much

         // which is also done in mpeg decoders with lowres > 0

         *height += 2;

     for (i = 0; i < 4; i++)

         linesize_align[i] = STRIDE_ALIGN;

 }
 

 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
 {

     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
     int chroma_shift = desc->log2_chroma_w;

     int linesize_align[AV_NUM_DATA_POINTERS];

     int align;

     avcodec_align_dimensions2(s, width, height, linesize_align);

     align               = FFMAX(linesize_align[0], linesize_align[3]);

     linesize_align[1] <<= chroma_shift;
     linesize_align[2] <<= chroma_shift;

     align               = FFMAX3(align, linesize_align[1], linesize_align[2]);
     *width              = FFALIGN(*width, align);

 }
 

 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos)
 {
     if (pos <= AVCHROMA_LOC_UNSPECIFIED || pos >= AVCHROMA_LOC_NB)
         return AVERROR(EINVAL);
     pos--;
 
     *xpos = (pos&1) * 128;
     *ypos = ((pos>>1)^(pos<4)) * 128;
 
     return 0;
 }
 

 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos)
 {
     int pos, xout, yout;
 
     for (pos = AVCHROMA_LOC_UNSPECIFIED + 1; pos < AVCHROMA_LOC_NB; pos++) {
         if (avcodec_enum_to_chroma_pos(&xout, &yout, pos) == 0 && xout == xpos && yout == ypos)
             return pos;
     }
     return AVCHROMA_LOC_UNSPECIFIED;
 }
 

 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
                              enum AVSampleFormat sample_fmt, const uint8_t *buf,
                              int buf_size, int align)
 {
     int ch, planar, needed_size, ret = 0;
 
     needed_size = av_samples_get_buffer_size(NULL, nb_channels,
                                              frame->nb_samples, sample_fmt,
                                              align);
     if (buf_size < needed_size)
         return AVERROR(EINVAL);
 
     planar = av_sample_fmt_is_planar(sample_fmt);
     if (planar && nb_channels > AV_NUM_DATA_POINTERS) {
         if (!(frame->extended_data = av_mallocz(nb_channels *
                                                 sizeof(*frame->extended_data))))
             return AVERROR(ENOMEM);
     } else {
         frame->extended_data = frame->data;
     }
 
     if ((ret = av_samples_fill_arrays(frame->extended_data, &frame->linesize[0],

                                       (uint8_t *)(intptr_t)buf, nb_channels, frame->nb_samples,

                                       sample_fmt, align)) < 0) {
         if (frame->extended_data != frame->data)

             av_freep(&frame->extended_data);

         return ret;
     }
     if (frame->extended_data != frame->data) {
         for (ch = 0; ch < AV_NUM_DATA_POINTERS; ch++)
             frame->data[ch] = frame->extended_data[ch];
     }
 
     return ret;
 }
 

 static int update_frame_pool(AVCodecContext *avctx, AVFrame *frame)

 {

     FramePool *pool = avctx->internal->pool;
     int i, ret;

     switch (avctx->codec_type) {
     case AVMEDIA_TYPE_VIDEO: {

         AVPicture picture;

         int size[4] = { 0 };
         int w = frame->width;
         int h = frame->height;
         int tmpsize, unaligned;

         if (pool->format == frame->format &&
             pool->width == frame->width && pool->height == frame->height)
             return 0;

         avcodec_align_dimensions2(avctx, &w, &h, pool->stride_align);

         if (!(avctx->flags & CODEC_FLAG_EMU_EDGE)) {

             w += EDGE_WIDTH * 2;
             h += EDGE_WIDTH * 2;

         }

         do {
             // NOTE: do not align linesizes individually, this breaks e.g. assumptions
             // that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2

             av_image_fill_linesizes(picture.linesize, avctx->pix_fmt, w);

             // increase alignment of w for next try (rhs gives the lowest bit set in w)

             w += w & ~(w - 1);

             unaligned = 0;

             for (i = 0; i < 4; i++)

                 unaligned |= picture.linesize[i] % pool->stride_align[i];

         } while (unaligned);

         tmpsize = av_image_fill_pointers(picture.data, avctx->pix_fmt, h,
                                          NULL, picture.linesize);

         if (tmpsize < 0)
             return -1;

         for (i = 0; i < 3 && picture.data[i + 1]; i++)
             size[i] = picture.data[i + 1] - picture.data[i];

         size[i] = tmpsize - (picture.data[i] - picture.data[0]);

         for (i = 0; i < 4; i++) {
             av_buffer_pool_uninit(&pool->pools[i]);
             pool->linesize[i] = picture.linesize[i];
             if (size[i]) {

                 pool->pools[i] = av_buffer_pool_init(size[i] + 16 + STRIDE_ALIGN - 1,

                                                      CONFIG_MEMORY_POISONING ?
                                                         NULL :
                                                         av_buffer_allocz);

                 if (!pool->pools[i]) {
                     ret = AVERROR(ENOMEM);
                     goto fail;
                 }
             }
         }
         pool->format = frame->format;
         pool->width  = frame->width;
         pool->height = frame->height;

         break;
         }
     case AVMEDIA_TYPE_AUDIO: {

         int ch     = av_frame_get_channels(frame); //av_get_channel_layout_nb_channels(frame->channel_layout);

         int planar = av_sample_fmt_is_planar(frame->format);
         int planes = planar ? ch : 1;
 
         if (pool->format == frame->format && pool->planes == planes &&
             pool->channels == ch && frame->nb_samples == pool->samples)
             return 0;
 
         av_buffer_pool_uninit(&pool->pools[0]);
         ret = av_samples_get_buffer_size(&pool->linesize[0], ch,
                                          frame->nb_samples, frame->format, 0);
         if (ret < 0)
             goto fail;

         pool->pools[0] = av_buffer_pool_init(pool->linesize[0], NULL);
         if (!pool->pools[0]) {
             ret = AVERROR(ENOMEM);
             goto fail;
         }

         pool->format     = frame->format;
         pool->planes     = planes;
         pool->channels   = ch;
         pool->samples = frame->nb_samples;
         break;

         }

     default: av_assert0(0);
     }
     return 0;
 fail:
     for (i = 0; i < 4; i++)
         av_buffer_pool_uninit(&pool->pools[i]);
     pool->format = -1;
     pool->planes = pool->channels = pool->samples = 0;
     pool->width  = pool->height = 0;
     return ret;
 }

 static int audio_get_buffer(AVCodecContext *avctx, AVFrame *frame)
 {
     FramePool *pool = avctx->internal->pool;
     int planes = pool->planes;
     int i;

     frame->linesize[0] = pool->linesize[0];
 
     if (planes > AV_NUM_DATA_POINTERS) {
         frame->extended_data = av_mallocz(planes * sizeof(*frame->extended_data));
         frame->nb_extended_buf = planes - AV_NUM_DATA_POINTERS;
         frame->extended_buf  = av_mallocz(frame->nb_extended_buf *
                                           sizeof(*frame->extended_buf));
         if (!frame->extended_data || !frame->extended_buf) {
             av_freep(&frame->extended_data);
             av_freep(&frame->extended_buf);
             return AVERROR(ENOMEM);

         }

     } else {

         frame->extended_data = frame->data;

         av_assert0(frame->nb_extended_buf == 0);
     }

 
     for (i = 0; i < FFMIN(planes, AV_NUM_DATA_POINTERS); i++) {
         frame->buf[i] = av_buffer_pool_get(pool->pools[0]);
         if (!frame->buf[i])
             goto fail;
         frame->extended_data[i] = frame->data[i] = frame->buf[i]->data;

     }

     for (i = 0; i < frame->nb_extended_buf; i++) {
         frame->extended_buf[i] = av_buffer_pool_get(pool->pools[0]);
         if (!frame->extended_buf[i])
             goto fail;
         frame->extended_data[i + AV_NUM_DATA_POINTERS] = frame->extended_buf[i]->data;

     }
 

     if (avctx->debug & FF_DEBUG_BUFFERS)
         av_log(avctx, AV_LOG_DEBUG, "default_get_buffer called on frame %p", frame);
 
     return 0;
 fail:
     av_frame_unref(frame);
     return AVERROR(ENOMEM);
 }

 static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
 {
     FramePool *pool = s->internal->pool;
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pic->format);
     int pixel_size = desc->comp[0].step_minus1 + 1;
     int h_chroma_shift, v_chroma_shift;
     int i;
 
     if (pic->data[0] != NULL) {
         av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");
         return -1;

     }

 
     memset(pic->data, 0, sizeof(pic->data));

     pic->extended_data = pic->data;

 
     av_pix_fmt_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
 
     for (i = 0; i < 4 && pool->pools[i]; i++) {
         const int h_shift = i == 0 ? 0 : h_chroma_shift;
         const int v_shift = i == 0 ? 0 : v_chroma_shift;

         int is_planar = pool->pools[2] || (i==0 && s->pix_fmt == AV_PIX_FMT_GRAY8);

 
         pic->linesize[i] = pool->linesize[i];
 
         pic->buf[i] = av_buffer_pool_get(pool->pools[i]);
         if (!pic->buf[i])
             goto fail;
 
         // no edge if EDGE EMU or not planar YUV

         if ((s->flags & CODEC_FLAG_EMU_EDGE) || !is_planar)

             pic->data[i] = pic->buf[i]->data;
         else {
             pic->data[i] = pic->buf[i]->data +
                 FFALIGN((pic->linesize[i] * EDGE_WIDTH >> v_shift) +
                         (pixel_size * EDGE_WIDTH >> h_shift), pool->stride_align[i]);
         }
     }
     for (; i < AV_NUM_DATA_POINTERS; i++) {
         pic->data[i] = NULL;
         pic->linesize[i] = 0;
     }
     if (pic->data[1] && !pic->data[2])
         avpriv_set_systematic_pal2((uint32_t *)pic->data[1], s->pix_fmt);

     if (s->debug & FF_DEBUG_BUFFERS)

         av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p\n", pic);

     return 0;

 fail:
     av_frame_unref(pic);
     return AVERROR(ENOMEM);

 }
 

 void avpriv_color_frame(AVFrame *frame, const int c[4])
 {
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
     int p, y, x;
 

     av_assert0(desc->flags & AV_PIX_FMT_FLAG_PLANAR);

 
     for (p = 0; p<desc->nb_components; p++) {
         uint8_t *dst = frame->data[p];
         int is_chroma = p == 1 || p == 2;

         int bytes  = is_chroma ? FF_CEIL_RSHIFT(frame->width,  desc->log2_chroma_w) : frame->width;
         int height = is_chroma ? FF_CEIL_RSHIFT(frame->height, desc->log2_chroma_h) : frame->height;
         for (y = 0; y < height; y++) {

             if (desc->comp[0].depth_minus1 >= 8) {
                 for (x = 0; x<bytes; x++)
                     ((uint16_t*)dst)[x] = c[p];
             }else
                 memset(dst, c[p], bytes);
             dst += frame->linesize[p];
         }
     }
 }
 

 int avcodec_default_get_buffer2(AVCodecContext *avctx, AVFrame *frame, int flags)

 {

     int ret;
 
     if ((ret = update_frame_pool(avctx, frame)) < 0)
         return ret;
 
 #if FF_API_GET_BUFFER

 FF_DISABLE_DEPRECATION_WARNINGS

     frame->type = FF_BUFFER_TYPE_INTERNAL;

 FF_ENABLE_DEPRECATION_WARNINGS

 #endif
 

     switch (avctx->codec_type) {
     case AVMEDIA_TYPE_VIDEO:
         return video_get_buffer(avctx, frame);
     case AVMEDIA_TYPE_AUDIO:
         return audio_get_buffer(avctx, frame);
     default:
         return -1;
     }
 }
 

 int ff_init_buffer_info(AVCodecContext *avctx, AVFrame *frame)

 {

     if (avctx->internal->pkt) {
         frame->pkt_pts = avctx->internal->pkt->pts;
         av_frame_set_pkt_pos     (frame, avctx->internal->pkt->pos);
         av_frame_set_pkt_duration(frame, avctx->internal->pkt->duration);
         av_frame_set_pkt_size    (frame, avctx->internal->pkt->size);

     } else {
         frame->pkt_pts = AV_NOPTS_VALUE;

         av_frame_set_pkt_pos     (frame, -1);
         av_frame_set_pkt_duration(frame, 0);
         av_frame_set_pkt_size    (frame, -1);

     }

     frame->reordered_opaque = avctx->reordered_opaque;

     switch (avctx->codec->type) {

     case AVMEDIA_TYPE_VIDEO:

         frame->format              = avctx->pix_fmt;

         if (!frame->sample_aspect_ratio.num)
             frame->sample_aspect_ratio = avctx->sample_aspect_ratio;

         if (av_frame_get_colorspace(frame) == AVCOL_SPC_UNSPECIFIED)
             av_frame_set_colorspace(frame, avctx->colorspace);
         if (av_frame_get_color_range(frame) == AVCOL_RANGE_UNSPECIFIED)
             av_frame_set_color_range(frame, avctx->color_range);

         break;
     case AVMEDIA_TYPE_AUDIO:

         if (!frame->sample_rate)
             frame->sample_rate    = avctx->sample_rate;
         if (frame->format < 0)
             frame->format         = avctx->sample_fmt;

         if (!frame->channel_layout) {
             if (avctx->channel_layout) {
                  if (av_get_channel_layout_nb_channels(avctx->channel_layout) !=
                      avctx->channels) {
                      av_log(avctx, AV_LOG_ERROR, "Inconsistent channel "
                             "configuration.\n");
                      return AVERROR(EINVAL);
                  }
 
                 frame->channel_layout = avctx->channel_layout;
             } else {
                 if (avctx->channels > FF_SANE_NB_CHANNELS) {
                     av_log(avctx, AV_LOG_ERROR, "Too many channels: %d.\n",
                            avctx->channels);
                     return AVERROR(ENOSYS);
                 }
             }
         }

         av_frame_set_channels(frame, avctx->channels);

         break;
     }

     return 0;

 }

 #if FF_API_GET_BUFFER

 FF_DISABLE_DEPRECATION_WARNINGS

 int avcodec_default_get_buffer(AVCodecContext *avctx, AVFrame *frame)

 {

     return avcodec_default_get_buffer2(avctx, frame, 0);
 }

 typedef struct CompatReleaseBufPriv {
     AVCodecContext avctx;
     AVFrame frame;
 } CompatReleaseBufPriv;
 
 static void compat_free_buffer(void *opaque, uint8_t *data)
 {
     CompatReleaseBufPriv *priv = opaque;

     if (priv->avctx.release_buffer)
         priv->avctx.release_buffer(&priv->avctx, &priv->frame);

     av_freep(&priv);

 }
 

 static void compat_release_buffer(void *opaque, uint8_t *data)

 {

     AVBufferRef *buf = opaque;
     av_buffer_unref(&buf);
 }

 FF_ENABLE_DEPRECATION_WARNINGS

 #endif

 static int get_buffer_internal(AVCodecContext *avctx, AVFrame *frame, int flags)

 {

     int override_dimensions = 1;

     int ret;
 

     if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
         if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0 || avctx->pix_fmt<0) {
             av_log(avctx, AV_LOG_ERROR, "video_get_buffer: image parameters invalid\n");
             return AVERROR(EINVAL);
         }

     }

     if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {

         if (frame->width <= 0 || frame->height <= 0) {

             frame->width  = FFMAX(avctx->width,  FF_CEIL_RSHIFT(avctx->coded_width,  avctx->lowres));
             frame->height = FFMAX(avctx->height, FF_CEIL_RSHIFT(avctx->coded_height, avctx->lowres));

             override_dimensions = 0;
         }

     }

     if ((ret = ff_init_buffer_info(avctx, frame)) < 0)
         return ret;

 #if FF_API_GET_BUFFER

 FF_DISABLE_DEPRECATION_WARNINGS

     /*

      * Wrap an old get_buffer()-allocated buffer in a bunch of AVBuffers.

      * We wrap each plane in its own AVBuffer. Each of those has a reference to
      * a dummy AVBuffer as its private data, unreffing it on free.
      * When all the planes are freed, the dummy buffer's free callback calls
      * release_buffer().
      */
     if (avctx->get_buffer) {
         CompatReleaseBufPriv *priv = NULL;
         AVBufferRef *dummy_buf = NULL;
         int planes, i, ret;

         if (flags & AV_GET_BUFFER_FLAG_REF)
             frame->reference    = 1;

         ret = avctx->get_buffer(avctx, frame);
         if (ret < 0)
             return ret;

         /* return if the buffers are already set up
          * this would happen e.g. when a custom get_buffer() calls
          * avcodec_default_get_buffer
          */
         if (frame->buf[0])

             goto end;

 
         priv = av_mallocz(sizeof(*priv));
         if (!priv) {
             ret = AVERROR(ENOMEM);
             goto fail;

         }

         priv->avctx = *avctx;
         priv->frame = *frame;

         dummy_buf = av_buffer_create(NULL, 0, compat_free_buffer, priv, 0);
         if (!dummy_buf) {
             ret = AVERROR(ENOMEM);
             goto fail;

         }

 #define WRAP_PLANE(ref_out, data, data_size)                            \
 do {                                                                    \
     AVBufferRef *dummy_ref = av_buffer_ref(dummy_buf);                  \
     if (!dummy_ref) {                                                   \
         ret = AVERROR(ENOMEM);                                          \
         goto fail;                                                      \
     }                                                                   \
     ref_out = av_buffer_create(data, data_size, compat_release_buffer,  \
                                dummy_ref, 0);                           \
     if (!ref_out) {                                                     \
         av_frame_unref(frame);                                          \
         ret = AVERROR(ENOMEM);                                          \
         goto fail;                                                      \
     }                                                                   \
 } while (0)
 
         if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
             const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);
 

             planes = av_pix_fmt_count_planes(frame->format);

             /* workaround for AVHWAccel plane count of 0, buf[0] is used as
                check for allocated buffers: make libavcodec happy */

             if (desc && desc->flags & AV_PIX_FMT_FLAG_HWACCEL)

                 planes = 1;

             if (!desc || planes <= 0) {

                 ret = AVERROR(EINVAL);
                 goto fail;
             }

             for (i = 0; i < planes; i++) {

                 int v_shift    = (i == 1 || i == 2) ? desc->log2_chroma_h : 0;
                 int plane_size = (frame->height >> v_shift) * frame->linesize[i];

                 WRAP_PLANE(frame->buf[i], frame->data[i], plane_size);
             }
         } else {
             int planar = av_sample_fmt_is_planar(frame->format);
             planes = planar ? avctx->channels : 1;
 
             if (planes > FF_ARRAY_ELEMS(frame->buf)) {
                 frame->nb_extended_buf = planes - FF_ARRAY_ELEMS(frame->buf);
                 frame->extended_buf = av_malloc(sizeof(*frame->extended_buf) *
                                                 frame->nb_extended_buf);
                 if (!frame->extended_buf) {
                     ret = AVERROR(ENOMEM);
                     goto fail;
                 }
             }

             for (i = 0; i < FFMIN(planes, FF_ARRAY_ELEMS(frame->buf)); i++)
                 WRAP_PLANE(frame->buf[i], frame->extended_data[i], frame->linesize[0]);

             for (i = 0; i < frame->nb_extended_buf; i++)

                 WRAP_PLANE(frame->extended_buf[i],
                            frame->extended_data[i + FF_ARRAY_ELEMS(frame->buf)],
                            frame->linesize[0]);
         }
 
         av_buffer_unref(&dummy_buf);

 end:

         frame->width  = avctx->width;
         frame->height = avctx->height;
 

         return 0;

 fail:
         avctx->release_buffer(avctx, frame);
         av_freep(&priv);
         av_buffer_unref(&dummy_buf);
         return ret;

     }

 FF_ENABLE_DEPRECATION_WARNINGS

 #endif
 

     ret = avctx->get_buffer2(avctx, frame, flags);
 

     if (avctx->codec_type == AVMEDIA_TYPE_VIDEO && !override_dimensions) {

         frame->width  = avctx->width;
         frame->height = avctx->height;
     }
 
     return ret;

 }
 

 int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
 {
     int ret = get_buffer_internal(avctx, frame, flags);
     if (ret < 0)
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
     return ret;
 }
 
 static int reget_buffer_internal(AVCodecContext *avctx, AVFrame *frame)

 {

     AVFrame *tmp;

     int ret;

     av_assert0(avctx->codec_type == AVMEDIA_TYPE_VIDEO);

     if (frame->data[0] && (frame->width != avctx->width || frame->height != avctx->height || frame->format != avctx->pix_fmt)) {
         av_log(avctx, AV_LOG_WARNING, "Picture changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s in reget buffer()\n",
                frame->width, frame->height, av_get_pix_fmt_name(frame->format), avctx->width, avctx->height, av_get_pix_fmt_name(avctx->pix_fmt));
         av_frame_unref(frame);

     }
 

     ff_init_buffer_info(avctx, frame);

     if (!frame->data[0])
         return ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF);

     if (av_frame_is_writable(frame)) {
         frame->pkt_pts = avctx->internal->pkt ? avctx->internal->pkt->pts : AV_NOPTS_VALUE;
         frame->reordered_opaque = avctx->reordered_opaque;

         return 0;

     }

     tmp = av_frame_alloc();
     if (!tmp)
         return AVERROR(ENOMEM);
 
     av_frame_move_ref(tmp, frame);

 
     ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF);
     if (ret < 0) {

         av_frame_free(&tmp);

         return ret;

     }

     av_frame_copy(frame, tmp);
     av_frame_free(&tmp);

     return 0;
 }
 

 int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
 {
     int ret = reget_buffer_internal(avctx, frame);
     if (ret < 0)
         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
     return ret;
 }
 

 #if FF_API_GET_BUFFER
 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic)
 {

     av_assert0(s->codec_type == AVMEDIA_TYPE_VIDEO);
 

     av_frame_unref(pic);
 }
 
 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic)
 {
     av_assert0(0);

     return AVERROR_BUG;

 }
 #endif
 

 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
 {

     int i;
 

     for (i = 0; i < count; i++) {
         int r = func(c, (char *)arg + i * size);
         if (ret)
             ret[i] = r;

     }
     return 0;
 }
 

 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr), void *arg, int *ret, int count)
 {

     int i;
 

     for (i = 0; i < count; i++) {
         int r = func(c, arg, i, 0);
         if (ret)
             ret[i] = r;

     }
     return 0;
 }
 

 static int is_hwaccel_pix_fmt(enum AVPixelFormat pix_fmt)
 {
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

     return desc->flags & AV_PIX_FMT_FLAG_HWACCEL;

 }
 

 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)

 {

     while (*fmt != AV_PIX_FMT_NONE && is_hwaccel_pix_fmt(*fmt))

         ++fmt;

     return fmt[0];
 }
 

 #if FF_API_AVFRAME_LAVC

 void avcodec_get_frame_defaults(AVFrame *frame)

 {

 #if LIBAVCODEC_VERSION_MAJOR >= 55
      // extended_data should explicitly be freed when needed, this code is unsafe currently
      // also this is not compatible to the <55 ABI/API
     if (frame->extended_data != frame->data && 0)

         av_freep(&frame->extended_data);

 #endif

     memset(frame, 0, sizeof(AVFrame));

     av_frame_unref(frame);

 }
 

 AVFrame *avcodec_alloc_frame(void)
 {

     return av_frame_alloc();

 }
 

 void avcodec_free_frame(AVFrame **frame)
 {

     av_frame_free(frame);

 }

 #endif

 MAKE_ACCESSORS(AVCodecContext, codec, AVRational, pkt_timebase)

 MAKE_ACCESSORS(AVCodecContext, codec, const AVCodecDescriptor *, codec_descriptor)

 MAKE_ACCESSORS(AVCodecContext, codec, int, lowres)

 MAKE_ACCESSORS(AVCodecContext, codec, int, seek_preroll)

 MAKE_ACCESSORS(AVCodecContext, codec, uint16_t*, chroma_intra_matrix)

 int av_codec_get_max_lowres(const AVCodec *codec)
 {
     return codec->max_lowres;
 }
 

 static void avcodec_get_subtitle_defaults(AVSubtitle *sub)
 {
     memset(sub, 0, sizeof(*sub));
     sub->pts = AV_NOPTS_VALUE;
 }
 

 static int get_bit_rate(AVCodecContext *ctx)
 {
     int bit_rate;
     int bits_per_sample;
 

     switch (ctx->codec_type) {

     case AVMEDIA_TYPE_VIDEO:
     case AVMEDIA_TYPE_DATA:
     case AVMEDIA_TYPE_SUBTITLE:
     case AVMEDIA_TYPE_ATTACHMENT:
         bit_rate = ctx->bit_rate;
         break;
     case AVMEDIA_TYPE_AUDIO:
         bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
         bit_rate = bits_per_sample ? ctx->sample_rate * ctx->channels * bits_per_sample : ctx->bit_rate;
         break;
     default:
         bit_rate = 0;
         break;
     }
     return bit_rate;
 }
 

 int attribute_align_arg ff_codec_open2_recursive(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
 {
     int ret = 0;
 

     ff_unlock_avcodec();

 
     ret = avcodec_open2(avctx, codec, options);
 

     ff_lock_avcodec(avctx);

     return ret;
 }
 

 int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)

 {

     int ret = 0;

     AVDictionary *tmp = NULL;
 

     if (avcodec_is_open(avctx))
         return 0;
 

     if ((!codec && !avctx->codec)) {

         av_log(avctx, AV_LOG_ERROR, "No codec provided to avcodec_open2()\n");

         return AVERROR(EINVAL);
     }
     if ((codec && avctx->codec && codec != avctx->codec)) {
         av_log(avctx, AV_LOG_ERROR, "This AVCodecContext was allocated for %s, "

                                     "but %s passed to avcodec_open2()\n", avctx->codec->name, codec->name);

         return AVERROR(EINVAL);
     }
     if (!codec)
         codec = avctx->codec;
 

     if (avctx->extradata_size < 0 || avctx->extradata_size >= FF_MAX_EXTRADATA_SIZE)
         return AVERROR(EINVAL);
 

     if (options)
         av_dict_copy(&tmp, *options, 0);

     ret = ff_lock_avcodec(avctx);
     if (ret < 0)

         return ret;

     avctx->internal = av_mallocz(sizeof(AVCodecInternal));
     if (!avctx->internal) {
         ret = AVERROR(ENOMEM);
         goto end;
     }
 

     avctx->internal->pool = av_mallocz(sizeof(*avctx->internal->pool));
     if (!avctx->internal->pool) {
         ret = AVERROR(ENOMEM);
         goto free_and_end;
     }
 

     avctx->internal->to_free = av_frame_alloc();
     if (!avctx->internal->to_free) {
         ret = AVERROR(ENOMEM);
         goto free_and_end;
     }
 

     if (codec->priv_data_size > 0) {

         if (!avctx->priv_data) {

             avctx->priv_data = av_mallocz(codec->priv_data_size);
             if (!avctx->priv_data) {
                 ret = AVERROR(ENOMEM);
                 goto end;
             }
             if (codec->priv_class) {
                 *(const AVClass **)avctx->priv_data = codec->priv_class;
                 av_opt_set_defaults(avctx->priv_data);
             }

         }

         if (codec->priv_class && (ret = av_opt_set_dict(avctx->priv_data, &tmp)) < 0)
             goto free_and_end;

     } else {
         avctx->priv_data = NULL;
     }

     if ((ret = av_opt_set_dict(avctx, &tmp)) < 0)
         goto free_and_end;

     // only call ff_set_dimensions() for non H.264/VP6F codecs so as not to overwrite previously setup dimensions

     if (!(avctx->coded_width && avctx->coded_height && avctx->width && avctx->height &&
           (avctx->codec_id == AV_CODEC_ID_H264 || avctx->codec_id == AV_CODEC_ID_VP6F))) {

     if (avctx->coded_width && avctx->coded_height)

         ret = ff_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);

     else if (avctx->width && avctx->height)

         ret = ff_set_dimensions(avctx, avctx->width, avctx->height);
     if (ret < 0)
         goto free_and_end;

     }

     if ((avctx->coded_width || avctx->coded_height || avctx->width || avctx->height)
         && (  av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx) < 0
            || av_image_check_size(avctx->width,       avctx->height,       0, avctx) < 0)) {

         av_log(avctx, AV_LOG_WARNING, "Ignoring invalid width/height values\n");

         ff_set_dimensions(avctx, 0, 0);

     }
 

     /* if the decoder init function was already called previously,

      * free the already allocated subtitle_header before overwriting it */

     if (av_codec_is_decoder(codec))

         av_freep(&avctx->subtitle_header);
 

     if (avctx->channels > FF_SANE_NB_CHANNELS) {

         ret = AVERROR(EINVAL);

         goto free_and_end;

     }
 

     avctx->codec = codec;

     if ((avctx->codec_type == AVMEDIA_TYPE_UNKNOWN || avctx->codec_type == codec->type) &&

         avctx->codec_id == AV_CODEC_ID_NONE) {

         avctx->codec_type = codec->type;
         avctx->codec_id   = codec->id;
     }

     if (avctx->codec_id != codec->id || (avctx->codec_type != codec->type

                                          && avctx->codec_type != AVMEDIA_TYPE_ATTACHMENT)) {

         av_log(avctx, AV_LOG_ERROR, "Codec type or id mismatches\n");

         ret = AVERROR(EINVAL);

         goto free_and_end;

     }

     avctx->frame_number = 0;

     avctx->codec_descriptor = avcodec_descriptor_get(avctx->codec_id);

     if (avctx->codec->capabilities & CODEC_CAP_EXPERIMENTAL &&
         avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {

         const char *codec_string = av_codec_is_encoder(codec) ? "encoder" : "decoder";
         AVCodec *codec2;

         av_log(avctx, AV_LOG_ERROR,

                "The %s '%s' is experimental but experimental codecs are not enabled, "
                "add '-strict %d' if you want to use it.\n",

                codec_string, codec->name, FF_COMPLIANCE_EXPERIMENTAL);
         codec2 = av_codec_is_encoder(codec) ? avcodec_find_encoder(codec->id) : avcodec_find_decoder(codec->id);
         if (!(codec2->capabilities & CODEC_CAP_EXPERIMENTAL))

             av_log(avctx, AV_LOG_ERROR, "Alternatively use the non experimental %s '%s'.\n",

                 codec_string, codec2->name);

         ret = AVERROR_EXPERIMENTAL;
         goto free_and_end;
     }
 

     if (avctx->codec_type == AVMEDIA_TYPE_AUDIO &&
         (!avctx->time_base.num || !avctx->time_base.den)) {
         avctx->time_base.num = 1;
         avctx->time_base.den = avctx->sample_rate;

     }
 

     if (!HAVE_THREADS)
         av_log(avctx, AV_LOG_WARNING, "Warning: not compiled with thread support, using thread emulation\n");
 

     if (CONFIG_FRAME_THREAD_ENCODER) {

         ff_unlock_avcodec(); //we will instanciate a few encoders thus kick the counter to prevent false detection of a problem

         ret = ff_frame_thread_encoder_init(avctx, options ? *options : NULL);

         ff_lock_avcodec(avctx);

         if (ret < 0)
             goto free_and_end;
     }

     if (HAVE_THREADS

         && !(avctx->internal->frame_thread_encoder && (avctx->active_thread_type&FF_THREAD_FRAME))) {

         ret = ff_thread_init(avctx);

         if (ret < 0) {
             goto free_and_end;
         }
     }

     if (!HAVE_THREADS && !(codec->capabilities & CODEC_CAP_AUTO_THREADS))
         avctx->thread_count = 1;

     if (avctx->codec->max_lowres < avctx->lowres || avctx->lowres < 0) {

         av_log(avctx, AV_LOG_ERROR, "The maximum value for lowres supported by the decoder is %d\n",

                avctx->codec->max_lowres);

         ret = AVERROR(EINVAL);
         goto free_and_end;

     }

     if (av_codec_is_encoder(avctx->codec)) {

         int i;

         if (avctx->codec->sample_fmts) {

             for (i = 0; avctx->codec->sample_fmts[i] != AV_SAMPLE_FMT_NONE; i++) {

                 if (avctx->sample_fmt == avctx->codec->sample_fmts[i])
                     break;

                 if (avctx->channels == 1 &&
                     av_get_planar_sample_fmt(avctx->sample_fmt) ==
                     av_get_planar_sample_fmt(avctx->codec->sample_fmts[i])) {
                     avctx->sample_fmt = avctx->codec->sample_fmts[i];
                     break;
                 }
             }

             if (avctx->codec->sample_fmts[i] == AV_SAMPLE_FMT_NONE) {

                 char buf[128];
                 snprintf(buf, sizeof(buf), "%d", avctx->sample_fmt);
                 av_log(avctx, AV_LOG_ERROR, "Specified sample format %s is invalid or not supported\n",
                        (char *)av_x_if_null(av_get_sample_fmt_name(avctx->sample_fmt), buf));

                 ret = AVERROR(EINVAL);
                 goto free_and_end;
             }

         }

         if (avctx->codec->pix_fmts) {

             for (i = 0; avctx->codec->pix_fmts[i] != AV_PIX_FMT_NONE; i++)

                 if (avctx->pix_fmt == avctx->codec->pix_fmts[i])
                     break;

             if (avctx->codec->pix_fmts[i] == AV_PIX_FMT_NONE

                 && !((avctx->codec_id == AV_CODEC_ID_MJPEG || avctx->codec_id == AV_CODEC_ID_LJPEG)

                      && avctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL)) {

                 char buf[128];
                 snprintf(buf, sizeof(buf), "%d", avctx->pix_fmt);
                 av_log(avctx, AV_LOG_ERROR, "Specified pixel format %s is invalid or not supported\n",
                        (char *)av_x_if_null(av_get_pix_fmt_name(avctx->pix_fmt), buf));

                 ret = AVERROR(EINVAL);
                 goto free_and_end;
             }
         }

         if (avctx->codec->supported_samplerates) {
             for (i = 0; avctx->codec->supported_samplerates[i] != 0; i++)
                 if (avctx->sample_rate == avctx->codec->supported_samplerates[i])
                     break;
             if (avctx->codec->supported_samplerates[i] == 0) {

                 av_log(avctx, AV_LOG_ERROR, "Specified sample rate %d is not supported\n",
                        avctx->sample_rate);

                 ret = AVERROR(EINVAL);
                 goto free_and_end;
             }
         }
         if (avctx->codec->channel_layouts) {
             if (!avctx->channel_layout) {

                 av_log(avctx, AV_LOG_WARNING, "Channel layout not specified\n");

             } else {
                 for (i = 0; avctx->codec->channel_layouts[i] != 0; i++)
                     if (avctx->channel_layout == avctx->codec->channel_layouts[i])
                         break;
                 if (avctx->codec->channel_layouts[i] == 0) {

                     char buf[512];
                     av_get_channel_layout_string(buf, sizeof(buf), -1, avctx->channel_layout);
                     av_log(avctx, AV_LOG_ERROR, "Specified channel layout '%s' is not supported\n", buf);

                     ret = AVERROR(EINVAL);
                     goto free_and_end;
                 }
             }
         }

         if (avctx->channel_layout && avctx->channels) {

             int channels = av_get_channel_layout_nb_channels(avctx->channel_layout);
             if (channels != avctx->channels) {
                 char buf[512];
                 av_get_channel_layout_string(buf, sizeof(buf), -1, avctx->channel_layout);
                 av_log(avctx, AV_LOG_ERROR,
                        "Channel layout '%s' with %d channels does not match number of specified channels %d\n",
                        buf, channels, avctx->channels);

                 ret = AVERROR(EINVAL);
                 goto free_and_end;
             }

         } else if (avctx->channel_layout) {
             avctx->channels = av_get_channel_layout_nb_channels(avctx->channel_layout);

         }

         if(avctx->codec_type == AVMEDIA_TYPE_VIDEO &&
            avctx->codec_id != AV_CODEC_ID_PNG // For mplayer
         ) {

             if (avctx->width <= 0 || avctx->height <= 0) {
                 av_log(avctx, AV_LOG_ERROR, "dimensions not set\n");
                 ret = AVERROR(EINVAL);
                 goto free_and_end;
             }
         }

         if (   (avctx->codec_type == AVMEDIA_TYPE_VIDEO || avctx->codec_type == AVMEDIA_TYPE_AUDIO)
             && avctx->bit_rate>0 && avctx->bit_rate<1000) {

             av_log(avctx, AV_LOG_WARNING, "Bitrate %d is extremely low, maybe you mean %dk\n", avctx->bit_rate, avctx->bit_rate);

         }

 
         if (!avctx->rc_initial_buffer_occupancy)
             avctx->rc_initial_buffer_occupancy = avctx->rc_buffer_size * 3 / 4;

     }

     avctx->pts_correction_num_faulty_pts =
     avctx->pts_correction_num_faulty_dts = 0;
     avctx->pts_correction_last_pts =
     avctx->pts_correction_last_dts = INT64_MIN;
 

     if (   avctx->codec->init && (!(avctx->active_thread_type&FF_THREAD_FRAME)
         || avctx->internal->frame_thread_encoder)) {

         ret = avctx->codec->init(avctx);
         if (ret < 0) {

             goto free_and_end;

         }

     }

     ret=0;

     if (av_codec_is_decoder(avctx->codec)) {

         if (!avctx->bit_rate)
             avctx->bit_rate = get_bit_rate(avctx);

         /* validate channel layout from the decoder */

         if (avctx->channel_layout) {
             int channels = av_get_channel_layout_nb_channels(avctx->channel_layout);
             if (!avctx->channels)
                 avctx->channels = channels;
             else if (channels != avctx->channels) {

                 char buf[512];
                 av_get_channel_layout_string(buf, sizeof(buf), -1, avctx->channel_layout);

                 av_log(avctx, AV_LOG_WARNING,

                        "Channel layout '%s' with %d channels does not match specified number of channels %d: "
                        "ignoring specified channel layout\n",
                        buf, channels, avctx->channels);

                 avctx->channel_layout = 0;
             }

         }

         if (avctx->channels && avctx->channels < 0 ||
             avctx->channels > FF_SANE_NB_CHANNELS) {
             ret = AVERROR(EINVAL);
             goto free_and_end;
         }

         if (avctx->sub_charenc) {
             if (avctx->codec_type != AVMEDIA_TYPE_SUBTITLE) {
                 av_log(avctx, AV_LOG_ERROR, "Character encoding is only "
                        "supported with subtitles codecs\n");
                 ret = AVERROR(EINVAL);
                 goto free_and_end;
             } else if (avctx->codec_descriptor->props & AV_CODEC_PROP_BITMAP_SUB) {
                 av_log(avctx, AV_LOG_WARNING, "Codec '%s' is bitmap-based, "
                        "subtitles character encoding will be ignored\n",
                        avctx->codec_descriptor->name);
                 avctx->sub_charenc_mode = FF_SUB_CHARENC_MODE_DO_NOTHING;
             } else {
                 /* input character encoding is set for a text based subtitle
                  * codec at this point */
                 if (avctx->sub_charenc_mode == FF_SUB_CHARENC_MODE_AUTOMATIC)
                     avctx->sub_charenc_mode = FF_SUB_CHARENC_MODE_PRE_DECODER;
 

                 if (avctx->sub_charenc_mode == FF_SUB_CHARENC_MODE_PRE_DECODER) {
 #if CONFIG_ICONV
                     iconv_t cd = iconv_open("UTF-8", avctx->sub_charenc);
                     if (cd == (iconv_t)-1) {
                         av_log(avctx, AV_LOG_ERROR, "Unable to open iconv context "
                                "with input character encoding \"%s\"\n", avctx->sub_charenc);
                         ret = AVERROR(errno);
                         goto free_and_end;
                     }
                     iconv_close(cd);
 #else

                     av_log(avctx, AV_LOG_ERROR, "Character encoding subtitles "
                            "conversion needs a libavcodec built with iconv support "
                            "for this codec\n");
                     ret = AVERROR(ENOSYS);
                     goto free_and_end;

 #endif

                 }
             }
         }

     }

 end:

     ff_unlock_avcodec();

     if (options) {
         av_dict_free(options);
         *options = tmp;
     }
 

     return ret;

 free_and_end:

     av_dict_free(&tmp);

     av_freep(&avctx->priv_data);

     if (avctx->internal) {
         av_frame_free(&avctx->internal->to_free);

         av_freep(&avctx->internal->pool);

     }

     av_freep(&avctx->internal);

     avctx->codec = NULL;

     goto end;

 }
 

 int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size)

 {

     if (avpkt->size < 0) {
         av_log(avctx, AV_LOG_ERROR, "Invalid negative user packet size %d\n", avpkt->size);
         return AVERROR(EINVAL);
     }
     if (size < 0 || size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE) {

         av_log(avctx, AV_LOG_ERROR, "Invalid minimum required packet size %"PRId64" (max allowed is %d)\n",

                size, INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);

         return AVERROR(EINVAL);

     }

     if (avctx) {

         av_assert0(!avpkt->data || avpkt->data != avctx->internal->byte_buffer);
         if (!avpkt->data || avpkt->size < size) {
             av_fast_padded_malloc(&avctx->internal->byte_buffer, &avctx->internal->byte_buffer_size, size);
             avpkt->data = avctx->internal->byte_buffer;
             avpkt->size = avctx->internal->byte_buffer_size;
             avpkt->destruct = NULL;
         }

     }

     if (avpkt->data) {

         AVBufferRef *buf = avpkt->buf;
 #if FF_API_DESTRUCT_PACKET

 FF_DISABLE_DEPRECATION_WARNINGS

         void *destruct = avpkt->destruct;

 FF_ENABLE_DEPRECATION_WARNINGS

 #endif

         if (avpkt->size < size) {

             av_log(avctx, AV_LOG_ERROR, "User packet is too small (%d < %"PRId64")\n", avpkt->size, size);

             return AVERROR(EINVAL);

         }

 
         av_init_packet(avpkt);

 #if FF_API_DESTRUCT_PACKET

 FF_DISABLE_DEPRECATION_WARNINGS

         avpkt->destruct = destruct;

 FF_ENABLE_DEPRECATION_WARNINGS

 #endif
         avpkt->buf      = buf;

         avpkt->size     = size;

         return 0;
     } else {

         int ret = av_new_packet(avpkt, size);
         if (ret < 0)

             av_log(avctx, AV_LOG_ERROR, "Failed to allocate packet of size %"PRId64"\n", size);

         return ret;

     }

 }
 

 int ff_alloc_packet(AVPacket *avpkt, int size)
 {
     return ff_alloc_packet2(NULL, avpkt, size);
 }
 

 /**
  * Pad last frame with silence.
  */
 static int pad_last_frame(AVCodecContext *s, AVFrame **dst, const AVFrame *src)
 {
     AVFrame *frame = NULL;
     int ret;
 

     if (!(frame = av_frame_alloc()))

         return AVERROR(ENOMEM);
 

     frame->format         = src->format;
     frame->channel_layout = src->channel_layout;

     av_frame_set_channels(frame, av_frame_get_channels(src));

     frame->nb_samples     = s->frame_size;
     ret = av_frame_get_buffer(frame, 32);
     if (ret < 0)

         goto fail;
 

     ret = av_frame_copy_props(frame, src);
     if (ret < 0)

         goto fail;
 
     if ((ret = av_samples_copy(frame->extended_data, src->extended_data, 0, 0,
                                src->nb_samples, s->channels, s->sample_fmt)) < 0)
         goto fail;
     if ((ret = av_samples_set_silence(frame->extended_data, src->nb_samples,
                                       frame->nb_samples - src->nb_samples,
                                       s->channels, s->sample_fmt)) < 0)
         goto fail;
 
     *dst = frame;
 
     return 0;
 
 fail:

     av_frame_free(&frame);

     return ret;
 }
 

 int attribute_align_arg avcodec_encode_audio2(AVCodecContext *avctx,
                                               AVPacket *avpkt,
                                               const AVFrame *frame,
                                               int *got_packet_ptr)
 {

     AVFrame tmp;

     AVFrame *padded_frame = NULL;

     int ret;

     AVPacket user_pkt = *avpkt;

     int needs_realloc = !user_pkt.data;

     *got_packet_ptr = 0;
 

     if (!(avctx->codec->capabilities & CODEC_CAP_DELAY) && !frame) {

         av_free_packet(avpkt);

         av_init_packet(avpkt);

         return 0;

     }
 

     /* ensure that extended_data is properly set */
     if (frame && !frame->extended_data) {
         if (av_sample_fmt_is_planar(avctx->sample_fmt) &&
             avctx->channels > AV_NUM_DATA_POINTERS) {
             av_log(avctx, AV_LOG_ERROR, "Encoding to a planar sample format, "

                                         "with more than %d channels, but extended_data is not set.\n",

                    AV_NUM_DATA_POINTERS);
             return AVERROR(EINVAL);
         }
         av_log(avctx, AV_LOG_WARNING, "extended_data is not set.\n");
 
         tmp = *frame;
         tmp.extended_data = tmp.data;
         frame = &tmp;
     }
 

     /* check for valid frame size */
     if (frame) {
         if (avctx->codec->capabilities & CODEC_CAP_SMALL_LAST_FRAME) {

             if (frame->nb_samples > avctx->frame_size) {
                 av_log(avctx, AV_LOG_ERROR, "more samples than frame size (avcodec_encode_audio2)\n");

                 return AVERROR(EINVAL);

             }

         } else if (!(avctx->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)) {

             if (frame->nb_samples < avctx->frame_size &&
                 !avctx->internal->last_audio_frame) {
                 ret = pad_last_frame(avctx, &padded_frame, frame);
                 if (ret < 0)
                     return ret;
 
                 frame = padded_frame;
                 avctx->internal->last_audio_frame = 1;
             }
 

             if (frame->nb_samples != avctx->frame_size) {
                 av_log(avctx, AV_LOG_ERROR, "nb_samples (%d) != frame_size (%d) (avcodec_encode_audio2)\n", frame->nb_samples, avctx->frame_size);

                 ret = AVERROR(EINVAL);
                 goto end;

             }

         }
     }
 

     ret = avctx->codec->encode2(avctx, avpkt, frame, got_packet_ptr);
     if (!ret) {
         if (*got_packet_ptr) {

             if (!(avctx->codec->capabilities & CODEC_CAP_DELAY)) {

                 if (avpkt->pts == AV_NOPTS_VALUE)
                     avpkt->pts = frame->pts;
                 if (!avpkt->duration)
                     avpkt->duration = ff_samples_to_time_base(avctx,
                                                               frame->nb_samples);

             }
             avpkt->dts = avpkt->pts;

         } else {
             avpkt->size = 0;

         }
     }

     if (avpkt->data && avpkt->data == avctx->internal->byte_buffer) {

         needs_realloc = 0;

         if (user_pkt.data) {
             if (user_pkt.size >= avpkt->size) {
                 memcpy(user_pkt.data, avpkt->data, avpkt->size);
             } else {
                 av_log(avctx, AV_LOG_ERROR, "Provided packet is too small, needs to be %d\n", avpkt->size);
                 avpkt->size = user_pkt.size;
                 ret = -1;
             }

             avpkt->buf      = user_pkt.buf;

             avpkt->data     = user_pkt.data;
             avpkt->destruct = user_pkt.destruct;
         } else {
             if (av_dup_packet(avpkt) < 0) {
                 ret = AVERROR(ENOMEM);
             }
         }
     }
 

     if (!ret) {

         if (needs_realloc && avpkt->data) {

             ret = av_buffer_realloc(&avpkt->buf, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);

             if (ret >= 0)
                 avpkt->data = avpkt->buf->data;

         }
 

         avctx->frame_number++;

     }

     if (ret < 0 || !*got_packet_ptr) {

         av_free_packet(avpkt);

         av_init_packet(avpkt);

         goto end;

     }

     /* NOTE: if we add any audio encoders which output non-keyframe packets,

      *       this needs to be moved to the encoders, but for now we can do it
      *       here to simplify things */

     avpkt->flags |= AV_PKT_FLAG_KEY;
 

 end:

     av_frame_free(&padded_frame);

     return ret;

 }
 

 #if FF_API_OLD_ENCODE_AUDIO

 int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx,
                                              uint8_t *buf, int buf_size,
                                              const short *samples)
 {
     AVPacket pkt;
     AVFrame *frame;
     int ret, samples_size, got_packet;
 
     av_init_packet(&pkt);
     pkt.data = buf;
     pkt.size = buf_size;
 
     if (samples) {

         frame = av_frame_alloc();

         if (!frame)
             return AVERROR(ENOMEM);

 
         if (avctx->frame_size) {
             frame->nb_samples = avctx->frame_size;
         } else {
             /* if frame_size is not set, the number of samples must be

              * calculated from the buffer size */

             int64_t nb_samples;
             if (!av_get_bits_per_sample(avctx->codec_id)) {
                 av_log(avctx, AV_LOG_ERROR, "avcodec_encode_audio() does not "

                                             "support this codec\n");

                 av_frame_free(&frame);

                 return AVERROR(EINVAL);
             }
             nb_samples = (int64_t)buf_size * 8 /
                          (av_get_bits_per_sample(avctx->codec_id) *

                           avctx->channels);

             if (nb_samples >= INT_MAX) {
                 av_frame_free(&frame);

                 return AVERROR(EINVAL);

             }

             frame->nb_samples = nb_samples;
         }
 
         /* it is assumed that the samples buffer is large enough based on the

          * relevant parameters */

         samples_size = av_samples_get_buffer_size(NULL, avctx->channels,
                                                   frame->nb_samples,
                                                   avctx->sample_fmt, 1);
         if ((ret = avcodec_fill_audio_frame(frame, avctx->channels,
                                             avctx->sample_fmt,

                                             (const uint8_t *)samples,

                                             samples_size, 1)) < 0) {
             av_frame_free(&frame);

             return ret;

         }

 
         /* fabricate frame pts from sample count.

          * this is needed because the avcodec_encode_audio() API does not have
          * a way for the user to provide pts */

         if (avctx->sample_rate && avctx->time_base.num)

             frame->pts = ff_samples_to_time_base(avctx,

                                                  avctx->internal->sample_count);

         else
             frame->pts = AV_NOPTS_VALUE;

         avctx->internal->sample_count += frame->nb_samples;
     } else {
         frame = NULL;
     }
 
     got_packet = 0;
     ret = avcodec_encode_audio2(avctx, &pkt, frame, &got_packet);
     if (!ret && got_packet && avctx->coded_frame) {
         avctx->coded_frame->pts       = pkt.pts;
         avctx->coded_frame->key_frame = !!(pkt.flags & AV_PKT_FLAG_KEY);
     }
     /* free any side data since we cannot return it */

     av_packet_free_side_data(&pkt);

 
     if (frame && frame->extended_data != frame->data)

         av_freep(&frame->extended_data);

     av_frame_free(&frame);

     return ret ? ret : pkt.size;
 }

 #endif
 

 #if FF_API_OLD_ENCODE_VIDEO

 int attribute_align_arg avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,

                                              const AVFrame *pict)

 {

     AVPacket pkt;
     int ret, got_packet = 0;
 

     if (buf_size < FF_MIN_BUFFER_SIZE) {

         av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");

         return -1;
     }

     av_init_packet(&pkt);
     pkt.data = buf;
     pkt.size = buf_size;
 
     ret = avcodec_encode_video2(avctx, &pkt, pict, &got_packet);
     if (!ret && got_packet && avctx->coded_frame) {
         avctx->coded_frame->pts       = pkt.pts;
         avctx->coded_frame->key_frame = !!(pkt.flags & AV_PKT_FLAG_KEY);
     }
 
     /* free any side data since we cannot return it */
     if (pkt.side_data_elems > 0) {
         int i;
         for (i = 0; i < pkt.side_data_elems; i++)
             av_free(pkt.side_data[i].data);
         av_freep(&pkt.side_data);
         pkt.side_data_elems = 0;
     }
 
     return ret ? ret : pkt.size;
 }

 #endif
 
 int attribute_align_arg avcodec_encode_video2(AVCodecContext *avctx,
                                               AVPacket *avpkt,
                                               const AVFrame *frame,
                                               int *got_packet_ptr)
 {
     int ret;

     AVPacket user_pkt = *avpkt;

     int needs_realloc = !user_pkt.data;

     *got_packet_ptr = 0;
 

     if(CONFIG_FRAME_THREAD_ENCODER &&
        avctx->internal->frame_thread_encoder && (avctx->active_thread_type&FF_THREAD_FRAME))

         return ff_thread_video_encode_frame(avctx, avpkt, frame, got_packet_ptr);
 

     if ((avctx->flags&CODEC_FLAG_PASS1) && avctx->stats_out)
         avctx->stats_out[0] = '\0';
 

     if (!(avctx->codec->capabilities & CODEC_CAP_DELAY) && !frame) {

         av_free_packet(avpkt);

         av_init_packet(avpkt);

         avpkt->size = 0;

         return 0;

     }
 
     if (av_image_check_size(avctx->width, avctx->height, 0, avctx))
         return AVERROR(EINVAL);
 

     av_assert0(avctx->codec->encode2);

     ret = avctx->codec->encode2(avctx, avpkt, frame, got_packet_ptr);

     av_assert0(ret <= 0);
 
     if (avpkt->data && avpkt->data == avctx->internal->byte_buffer) {

         needs_realloc = 0;

         if (user_pkt.data) {
             if (user_pkt.size >= avpkt->size) {
                 memcpy(user_pkt.data, avpkt->data, avpkt->size);
             } else {
                 av_log(avctx, AV_LOG_ERROR, "Provided packet is too small, needs to be %d\n", avpkt->size);
                 avpkt->size = user_pkt.size;
                 ret = -1;
             }

             avpkt->buf      = user_pkt.buf;

             avpkt->data     = user_pkt.data;
             avpkt->destruct = user_pkt.destruct;
         } else {
             if (av_dup_packet(avpkt) < 0) {
                 ret = AVERROR(ENOMEM);
             }
         }
     }
 

     if (!ret) {
         if (!*got_packet_ptr)
             avpkt->size = 0;
         else if (!(avctx->codec->capabilities & CODEC_CAP_DELAY))
             avpkt->pts = avpkt->dts = frame->pts;

         if (needs_realloc && avpkt->data) {
             ret = av_buffer_realloc(&avpkt->buf, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);

             if (ret >= 0)
                 avpkt->data = avpkt->buf->data;

         }
 

         avctx->frame_number++;

     }

     if (ret < 0 || !*got_packet_ptr)
         av_free_packet(avpkt);

     else
         av_packet_merge_side_data(avpkt);

     emms_c();
     return ret;

 }
 

 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,

                             const AVSubtitle *sub)
 {
     int ret;

     if (sub->start_display_time) {

         av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
         return -1;
     }

     ret = avctx->codec->encode_sub(avctx, buf, buf_size, sub);

     avctx->frame_number++;
     return ret;
 }
 

 /**
  * Attempt to guess proper monotonic timestamps for decoded video frames
  * which might have incorrect times. Input timestamps may wrap around, in
  * which case the output will as well.
  *
  * @param pts the pts field of the decoded AVPacket, as passed through
  * AVFrame.pkt_pts
  * @param dts the dts field of the decoded AVPacket
  * @return one of the input values, may be AV_NOPTS_VALUE
  */
 static int64_t guess_correct_pts(AVCodecContext *ctx,
                                  int64_t reordered_pts, int64_t dts)
 {
     int64_t pts = AV_NOPTS_VALUE;
 
     if (dts != AV_NOPTS_VALUE) {
         ctx->pts_correction_num_faulty_dts += dts <= ctx->pts_correction_last_dts;
         ctx->pts_correction_last_dts = dts;

     } else if (reordered_pts != AV_NOPTS_VALUE)
         ctx->pts_correction_last_dts = reordered_pts;
 

     if (reordered_pts != AV_NOPTS_VALUE) {
         ctx->pts_correction_num_faulty_pts += reordered_pts <= ctx->pts_correction_last_pts;
         ctx->pts_correction_last_pts = reordered_pts;

     } else if(dts != AV_NOPTS_VALUE)
         ctx->pts_correction_last_pts = dts;
 

     if ((ctx->pts_correction_num_faulty_pts<=ctx->pts_correction_num_faulty_dts || dts == AV_NOPTS_VALUE)
        && reordered_pts != AV_NOPTS_VALUE)
         pts = reordered_pts;
     else
         pts = dts;
 
     return pts;
 }
 

 static int apply_param_change(AVCodecContext *avctx, AVPacket *avpkt)

 {

     int size = 0, ret;

     const uint8_t *data;
     uint32_t flags;
 
     data = av_packet_get_side_data(avpkt, AV_PKT_DATA_PARAM_CHANGE, &size);

     if (!data)
         return 0;
 
     if (!(avctx->codec->capabilities & CODEC_CAP_PARAM_CHANGE)) {
         av_log(avctx, AV_LOG_ERROR, "This decoder does not support parameter "
                "changes, but PARAM_CHANGE side data was sent to it.\n");
         return AVERROR(EINVAL);
     }
 
     if (size < 4)
         goto fail;
 

     flags = bytestream_get_le32(&data);
     size -= 4;

     if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {

         if (size < 4)
             goto fail;

         avctx->channels = bytestream_get_le32(&data);
         size -= 4;
     }
     if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) {
         if (size < 8)

             goto fail;

         avctx->channel_layout = bytestream_get_le64(&data);
         size -= 8;
     }
     if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {

         if (size < 4)
             goto fail;

         avctx->sample_rate = bytestream_get_le32(&data);
         size -= 4;
     }
     if (flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) {
         if (size < 8)

             goto fail;

         avctx->width  = bytestream_get_le32(&data);
         avctx->height = bytestream_get_le32(&data);
         size -= 8;

         ret = ff_set_dimensions(avctx, avctx->width, avctx->height);
         if (ret < 0)
             return ret;

     }

 
     return 0;
 fail:
     av_log(avctx, AV_LOG_ERROR, "PARAM_CHANGE side data too small.\n");
     return AVERROR_INVALIDDATA;

 }
 

 static int add_metadata_from_side_data(AVCodecContext *avctx, AVFrame *frame)
 {

     int size;

     const uint8_t *side_metadata;
 

     AVDictionary **frame_md = avpriv_frame_get_metadatap(frame);
 

     side_metadata = av_packet_get_side_data(avctx->internal->pkt,

                                             AV_PKT_DATA_STRINGS_METADATA, &size);

     return av_packet_unpack_dictionary(side_metadata, size, frame_md);

 }
 

 static int unrefcount_frame(AVCodecInternal *avci, AVFrame *frame)
 {
     int ret;
 
     /* move the original frame to our backup */
     av_frame_unref(avci->to_free);
     av_frame_move_ref(avci->to_free, frame);
 
     /* now copy everything except the AVBufferRefs back
      * note that we make a COPY of the side data, so calling av_frame_free() on
      * the caller's frame will work properly */
     ret = av_frame_copy_props(frame, avci->to_free);
     if (ret < 0)
         return ret;
 
     memcpy(frame->data,     avci->to_free->data,     sizeof(frame->data));
     memcpy(frame->linesize, avci->to_free->linesize, sizeof(frame->linesize));
     if (avci->to_free->extended_data != avci->to_free->data) {

         int planes = av_frame_get_channels(avci->to_free);

         int size   = planes * sizeof(*frame->extended_data);
 
         if (!size) {
             av_frame_unref(frame);
             return AVERROR_BUG;
         }
 
         frame->extended_data = av_malloc(size);
         if (!frame->extended_data) {
             av_frame_unref(frame);
             return AVERROR(ENOMEM);
         }
         memcpy(frame->extended_data, avci->to_free->extended_data,
                size);
     } else
         frame->extended_data = frame->data;
 
     frame->format         = avci->to_free->format;
     frame->width          = avci->to_free->width;
     frame->height         = avci->to_free->height;
     frame->channel_layout = avci->to_free->channel_layout;
     frame->nb_samples     = avci->to_free->nb_samples;

     av_frame_set_channels(frame, av_frame_get_channels(avci->to_free));

 
     return 0;
 }
 

 int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,

                                               int *got_picture_ptr,

                                               const AVPacket *avpkt)

 {

     AVCodecInternal *avci = avctx->internal;

     int ret;

     // copy to ensure we do not change avpkt
     AVPacket tmp = *avpkt;

     if (!avctx->codec)
         return AVERROR(EINVAL);

     if (avctx->codec->type != AVMEDIA_TYPE_VIDEO) {
         av_log(avctx, AV_LOG_ERROR, "Invalid media type for video\n");
         return AVERROR(EINVAL);
     }
 

     *got_picture_ptr = 0;
     if ((avctx->coded_width || avctx->coded_height) && av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx))

         return AVERROR(EINVAL);

     av_frame_unref(picture);

     if ((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size || (avctx->active_thread_type & FF_THREAD_FRAME)) {

         int did_split = av_packet_split_side_data(&tmp);

         ret = apply_param_change(avctx, &tmp);
         if (ret < 0) {
             av_log(avctx, AV_LOG_ERROR, "Error applying parameter changes.\n");
             if (avctx->err_recognition & AV_EF_EXPLODE)
                 goto fail;
         }
 

         avctx->internal->pkt = &tmp;

         if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME)
             ret = ff_thread_decode_frame(avctx, picture, got_picture_ptr,

                                          &tmp);

         else {
             ret = avctx->codec->decode(avctx, picture, got_picture_ptr,

                                        &tmp);

             picture->pkt_dts = avpkt->dts;

 
             if(!avctx->has_b_frames){

                 av_frame_set_pkt_pos(picture, avpkt->pos);

             }
             //FIXME these should be under if(!avctx->has_b_frames)

             /* get_buffer is supposed to set frame parameters */
             if (!(avctx->codec->capabilities & CODEC_CAP_DR1)) {

                 if (!picture->sample_aspect_ratio.num)    picture->sample_aspect_ratio = avctx->sample_aspect_ratio;
                 if (!picture->width)                      picture->width               = avctx->width;
                 if (!picture->height)                     picture->height              = avctx->height;
                 if (picture->format == AV_PIX_FMT_NONE)   picture->format              = avctx->pix_fmt;

             }

         }

         add_metadata_from_side_data(avctx, picture);

 fail:

         emms_c(); //needed to avoid an emms_c() call before every return;

         avctx->internal->pkt = NULL;

         if (did_split) {

             av_packet_free_side_data(&tmp);

             if(ret == tmp.size)
                 ret = avpkt->size;
         }

         if (*got_picture_ptr) {
             if (!avctx->refcounted_frames) {

                 int err = unrefcount_frame(avci, picture);
                 if (err < 0)
                     return err;

             }
 

             avctx->frame_number++;

             av_frame_set_best_effort_timestamp(picture,
                                                guess_correct_pts(avctx,
                                                                  picture->pkt_pts,
                                                                  picture->pkt_dts));

         } else
             av_frame_unref(picture);

     } else
         ret = 0;

     /* many decoders assign whole AVFrames, thus overwriting extended_data;
      * make sure it's set correctly */

     av_assert0(!picture->extended_data || picture->extended_data == picture->data);

     return ret;
 }
 

 #if FF_API_OLD_DECODE_AUDIO

 int attribute_align_arg avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,

                                               int *frame_size_ptr,
                                               AVPacket *avpkt)

 {

     AVFrame *frame = av_frame_alloc();

     int ret, got_frame = 0;
 

     if (!frame)
         return AVERROR(ENOMEM);

     if (avctx->get_buffer != avcodec_default_get_buffer) {

         av_log(avctx, AV_LOG_ERROR, "Custom get_buffer() for use with"

                                     "avcodec_decode_audio3() detected. Overriding with avcodec_default_get_buffer\n");

         av_log(avctx, AV_LOG_ERROR, "Please port your application to "

                                     "avcodec_decode_audio4()\n");

         avctx->get_buffer = avcodec_default_get_buffer;
         avctx->release_buffer = avcodec_default_release_buffer;

     }
 

     ret = avcodec_decode_audio4(avctx, frame, &got_frame, avpkt);

 
     if (ret >= 0 && got_frame) {
         int ch, plane_size;

         int planar    = av_sample_fmt_is_planar(avctx->sample_fmt);

         int data_size = av_samples_get_buffer_size(&plane_size, avctx->channels,

                                                    frame->nb_samples,

                                                    avctx->sample_fmt, 1);
         if (*frame_size_ptr < data_size) {
             av_log(avctx, AV_LOG_ERROR, "output buffer size is too small for "

                                         "the current frame (%d < %d)\n", *frame_size_ptr, data_size);

             av_frame_free(&frame);

             return AVERROR(EINVAL);
         }
 

         memcpy(samples, frame->extended_data[0], plane_size);

 
         if (planar && avctx->channels > 1) {
             uint8_t *out = ((uint8_t *)samples) + plane_size;
             for (ch = 1; ch < avctx->channels; ch++) {

                 memcpy(out, frame->extended_data[ch], plane_size);

                 out += plane_size;
             }
         }
         *frame_size_ptr = data_size;
     } else {
         *frame_size_ptr = 0;
     }

     av_frame_free(&frame);

     return ret;
 }

 #endif
 
 int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
                                               AVFrame *frame,
                                               int *got_frame_ptr,

                                               const AVPacket *avpkt)

 {

     AVCodecInternal *avci = avctx->internal;

     int ret = 0;
 
     *got_frame_ptr = 0;

     if (!avpkt->data && avpkt->size) {
         av_log(avctx, AV_LOG_ERROR, "invalid packet: NULL data, size != 0\n");
         return AVERROR(EINVAL);
     }

     if (!avctx->codec)
         return AVERROR(EINVAL);

     if (avctx->codec->type != AVMEDIA_TYPE_AUDIO) {
         av_log(avctx, AV_LOG_ERROR, "Invalid media type for audio\n");
         return AVERROR(EINVAL);
     }

     av_frame_unref(frame);

     if ((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size || (avctx->active_thread_type & FF_THREAD_FRAME)) {

         uint8_t *side;
         int side_size;

         uint32_t discard_padding = 0;

         // copy to ensure we do not change avpkt
         AVPacket tmp = *avpkt;
         int did_split = av_packet_split_side_data(&tmp);

         ret = apply_param_change(avctx, &tmp);
         if (ret < 0) {
             av_log(avctx, AV_LOG_ERROR, "Error applying parameter changes.\n");
             if (avctx->err_recognition & AV_EF_EXPLODE)
                 goto fail;
         }

         avctx->internal->pkt = &tmp;

         if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME)
             ret = ff_thread_decode_frame(avctx, frame, got_frame_ptr, &tmp);
         else {
             ret = avctx->codec->decode(avctx, frame, got_frame_ptr, &tmp);
             frame->pkt_dts = avpkt->dts;
         }

         if (ret >= 0 && *got_frame_ptr) {

             add_metadata_from_side_data(avctx, frame);

             avctx->frame_number++;

             av_frame_set_best_effort_timestamp(frame,
                                                guess_correct_pts(avctx,
                                                                  frame->pkt_pts,
                                                                  frame->pkt_dts));

             if (frame->format == AV_SAMPLE_FMT_NONE)
                 frame->format = avctx->sample_fmt;

             if (!frame->channel_layout)
                 frame->channel_layout = avctx->channel_layout;

             if (!av_frame_get_channels(frame))
                 av_frame_set_channels(frame, avctx->channels);

             if (!frame->sample_rate)
                 frame->sample_rate = avctx->sample_rate;

         }

         side= av_packet_get_side_data(avctx->internal->pkt, AV_PKT_DATA_SKIP_SAMPLES, &side_size);

         if(side && side_size>=10) {
             avctx->internal->skip_samples = AV_RL32(side);

             av_log(avctx, AV_LOG_DEBUG, "skip %d samples due to side data\n",
                    avctx->internal->skip_samples);

             discard_padding = AV_RL32(side + 4);

         }

         if (avctx->internal->skip_samples && *got_frame_ptr) {

             if(frame->nb_samples <= avctx->internal->skip_samples){
                 *got_frame_ptr = 0;
                 avctx->internal->skip_samples -= frame->nb_samples;

                 av_log(avctx, AV_LOG_DEBUG, "skip whole frame, skip left: %d\n",
                        avctx->internal->skip_samples);

             } else {
                 av_samples_copy(frame->extended_data, frame->extended_data, 0, avctx->internal->skip_samples,
                                 frame->nb_samples - avctx->internal->skip_samples, avctx->channels, frame->format);

                 if(avctx->pkt_timebase.num && avctx->sample_rate) {

                     int64_t diff_ts = av_rescale_q(avctx->internal->skip_samples,
                                                    (AVRational){1, avctx->sample_rate},
                                                    avctx->pkt_timebase);

                     if(frame->pkt_pts!=AV_NOPTS_VALUE)

                         frame->pkt_pts += diff_ts;

                     if(frame->pkt_dts!=AV_NOPTS_VALUE)

                         frame->pkt_dts += diff_ts;

                     if (av_frame_get_pkt_duration(frame) >= diff_ts)
                         av_frame_set_pkt_duration(frame, av_frame_get_pkt_duration(frame) - diff_ts);

                 } else {
                     av_log(avctx, AV_LOG_WARNING, "Could not update timestamps for skipped samples.\n");

                 }

                 av_log(avctx, AV_LOG_DEBUG, "skip %d/%d samples\n",
                        avctx->internal->skip_samples, frame->nb_samples);

                 frame->nb_samples -= avctx->internal->skip_samples;
                 avctx->internal->skip_samples = 0;
             }
         }
 

         if (discard_padding > 0 && discard_padding <= frame->nb_samples && *got_frame_ptr) {
             if (discard_padding == frame->nb_samples) {
                 *got_frame_ptr = 0;
             } else {
                 if(avctx->pkt_timebase.num && avctx->sample_rate) {
                     int64_t diff_ts = av_rescale_q(frame->nb_samples - discard_padding,
                                                    (AVRational){1, avctx->sample_rate},
                                                    avctx->pkt_timebase);
                     if (av_frame_get_pkt_duration(frame) >= diff_ts)
                         av_frame_set_pkt_duration(frame, av_frame_get_pkt_duration(frame) - diff_ts);
                 } else {
                     av_log(avctx, AV_LOG_WARNING, "Could not update timestamps for discarded samples.\n");
                 }
                 av_log(avctx, AV_LOG_DEBUG, "discard %d/%d samples\n",
                        discard_padding, frame->nb_samples);
                 frame->nb_samples -= discard_padding;
             }
         }

 fail:

         avctx->internal->pkt = NULL;

         if (did_split) {

             av_packet_free_side_data(&tmp);

             if(ret == tmp.size)
                 ret = avpkt->size;
         }

         if (ret >= 0 && *got_frame_ptr) {

             if (!avctx->refcounted_frames) {

                 int err = unrefcount_frame(avci, frame);
                 if (err < 0)
                     return err;

             }

         } else

             av_frame_unref(frame);

     }

     return ret;
 }
 

 #define UTF8_MAX_BYTES 4 /* 5 and 6 bytes sequences should not be used */
 static int recode_subtitle(AVCodecContext *avctx,
                            AVPacket *outpkt, const AVPacket *inpkt)
 {

 #if CONFIG_ICONV

     iconv_t cd = (iconv_t)-1;
     int ret = 0;
     char *inb, *outb;
     size_t inl, outl;
     AVPacket tmp;
 #endif
 

     if (avctx->sub_charenc_mode != FF_SUB_CHARENC_MODE_PRE_DECODER || inpkt->size == 0)

         return 0;
 

 #if CONFIG_ICONV

     cd = iconv_open("UTF-8", avctx->sub_charenc);

     av_assert0(cd != (iconv_t)-1);

 
     inb = inpkt->data;
     inl = inpkt->size;
 
     if (inl >= INT_MAX / UTF8_MAX_BYTES - FF_INPUT_BUFFER_PADDING_SIZE) {
         av_log(avctx, AV_LOG_ERROR, "Subtitles packet is too big for recoding\n");
         ret = AVERROR(ENOMEM);
         goto end;
     }
 
     ret = av_new_packet(&tmp, inl * UTF8_MAX_BYTES);
     if (ret < 0)
         goto end;

     outpkt->buf  = tmp.buf;

     outpkt->data = tmp.data;
     outpkt->size = tmp.size;
     outb = outpkt->data;
     outl = outpkt->size;
 
     if (iconv(cd, &inb, &inl, &outb, &outl) == (size_t)-1 ||
         iconv(cd, NULL, NULL, &outb, &outl) == (size_t)-1 ||
         outl >= outpkt->size || inl != 0) {
         av_log(avctx, AV_LOG_ERROR, "Unable to recode subtitle event \"%s\" "
                "from %s to UTF-8\n", inpkt->data, avctx->sub_charenc);
         av_free_packet(&tmp);
         ret = AVERROR(errno);
         goto end;
     }
     outpkt->size -= outl;

     memset(outpkt->data + outpkt->size, 0, outl);

 
 end:
     if (cd != (iconv_t)-1)
         iconv_close(cd);
     return ret;
 #else
     av_assert0(!"requesting subtitles recoding without iconv");
 #endif
 }
 

 static int utf8_check(const uint8_t *str)
 {
     const uint8_t *byte;
     uint32_t codepoint, min;
 
     while (*str) {
         byte = str;
         GET_UTF8(codepoint, *(byte++), return 0;);
         min = byte - str == 1 ? 0 : byte - str == 2 ? 0x80 :
               1 << (5 * (byte - str) - 4);
         if (codepoint < min || codepoint >= 0x110000 ||
             codepoint == 0xFFFE /* BOM */ ||
             codepoint >= 0xD800 && codepoint <= 0xDFFF /* surrogates */)
             return 0;
         str = byte;
     }
     return 1;
 }
 

 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,

                              int *got_sub_ptr,
                              AVPacket *avpkt)

 {

     int i, ret = 0;

     if (!avpkt->data && avpkt->size) {
         av_log(avctx, AV_LOG_ERROR, "invalid packet: NULL data, size != 0\n");
         return AVERROR(EINVAL);
     }
     if (!avctx->codec)
         return AVERROR(EINVAL);

     if (avctx->codec->type != AVMEDIA_TYPE_SUBTITLE) {
         av_log(avctx, AV_LOG_ERROR, "Invalid media type for subtitles\n");
         return AVERROR(EINVAL);
     }
 

     *got_sub_ptr = 0;

     avcodec_get_subtitle_defaults(sub);

     if ((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size) {

         AVPacket pkt_recoded;

         AVPacket tmp = *avpkt;
         int did_split = av_packet_split_side_data(&tmp);
         //apply_param_change(avctx, &tmp);
 

         if (did_split) {
             /* FFMIN() prevents overflow in case the packet wasn't allocated with
              * proper padding.
              * If the side data is smaller than the buffer padding size, the
              * remaining bytes should have already been filled with zeros by the
              * original packet allocation anyway. */
             memset(tmp.data + tmp.size, 0,
                    FFMIN(avpkt->size - tmp.size, FF_INPUT_BUFFER_PADDING_SIZE));
         }
 

         pkt_recoded = tmp;
         ret = recode_subtitle(avctx, &pkt_recoded, &tmp);
         if (ret < 0) {
             *got_sub_ptr = 0;
         } else {

             avctx->internal->pkt = &pkt_recoded;

 
             if (avctx->pkt_timebase.den && avpkt->pts != AV_NOPTS_VALUE)
                 sub->pts = av_rescale_q(avpkt->pts,
                                         avctx->pkt_timebase, AV_TIME_BASE_Q);
             ret = avctx->codec->decode(avctx, sub, got_sub_ptr, &pkt_recoded);

             av_assert1((ret >= 0) >= !!*got_sub_ptr &&
                        !!*got_sub_ptr >= !!sub->num_rects);

 
             if (sub->num_rects && !sub->end_display_time && avpkt->duration &&
                 avctx->pkt_timebase.num) {
                 AVRational ms = { 1, 1000 };
                 sub->end_display_time = av_rescale_q(avpkt->duration,
                                                      avctx->pkt_timebase, ms);
             }
 

             for (i = 0; i < sub->num_rects; i++) {
                 if (sub->rects[i]->ass && !utf8_check(sub->rects[i]->ass)) {
                     av_log(avctx, AV_LOG_ERROR,
                            "Invalid UTF-8 in decoded subtitles text; "
                            "maybe missing -sub_charenc option\n");
                     avsubtitle_free(sub);
                     return AVERROR_INVALIDDATA;
                 }
             }
 

             if (tmp.data != pkt_recoded.data) { // did we recode?
                 /* prevent from destroying side data from original packet */
                 pkt_recoded.side_data = NULL;
                 pkt_recoded.side_data_elems = 0;
 
                 av_free_packet(&pkt_recoded);
             }

             if (avctx->codec_descriptor->props & AV_CODEC_PROP_BITMAP_SUB)
                 sub->format = 0;
             else if (avctx->codec_descriptor->props & AV_CODEC_PROP_TEXT_SUB)
                 sub->format = 1;

             avctx->internal->pkt = NULL;

         }
 

         if (did_split) {

             av_packet_free_side_data(&tmp);

             if(ret == tmp.size)
                 ret = avpkt->size;
         }
 

         if (*got_sub_ptr)
             avctx->frame_number++;

     }
 

     return ret;
 }
 

 void avsubtitle_free(AVSubtitle *sub)
 {
     int i;
 

     for (i = 0; i < sub->num_rects; i++) {

         av_freep(&sub->rects[i]->pict.data[0]);
         av_freep(&sub->rects[i]->pict.data[1]);
         av_freep(&sub->rects[i]->pict.data[2]);
         av_freep(&sub->rects[i]->pict.data[3]);
         av_freep(&sub->rects[i]->text);
         av_freep(&sub->rects[i]->ass);
         av_freep(&sub->rects[i]);

     }
 

     av_freep(&sub->rects);

 
     memset(sub, 0, sizeof(AVSubtitle));
 }
 

 av_cold int ff_codec_close_recursive(AVCodecContext *avctx)
 {
     int ret = 0;
 

     ff_unlock_avcodec();

 
     ret = avcodec_close(avctx);
 

     ff_lock_avcodec(NULL);

     return ret;
 }
 

 av_cold int avcodec_close(AVCodecContext *avctx)

 {

     int ret;
 
     if (!avctx)
         return 0;
 
     ret = ff_lock_avcodec(avctx);

     if (ret < 0)
         return ret;

     if (avcodec_is_open(avctx)) {

         FramePool *pool = avctx->internal->pool;
         int i;

         if (CONFIG_FRAME_THREAD_ENCODER &&
             avctx->internal->frame_thread_encoder && avctx->thread_count > 1) {

             ff_unlock_avcodec();

             ff_frame_thread_encoder_free(avctx);

             ff_lock_avcodec(avctx);

         }

         if (HAVE_THREADS && avctx->internal->thread_ctx)

             ff_thread_free(avctx);
         if (avctx->codec && avctx->codec->close)
             avctx->codec->close(avctx);
         avctx->coded_frame = NULL;

         avctx->internal->byte_buffer_size = 0;
         av_freep(&avctx->internal->byte_buffer);

         av_frame_free(&avctx->internal->to_free);

         for (i = 0; i < FF_ARRAY_ELEMS(pool->pools); i++)
             av_buffer_pool_uninit(&pool->pools[i]);
         av_freep(&avctx->internal->pool);

         av_freep(&avctx->internal);
     }
 
     if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)

         av_opt_free(avctx->priv_data);
     av_opt_free(avctx);

     av_freep(&avctx->priv_data);

     if (av_codec_is_encoder(avctx->codec))

         av_freep(&avctx->extradata);

     avctx->codec = NULL;

     avctx->active_thread_type = 0;

     ff_unlock_avcodec();

     return 0;
 }
 

 static enum AVCodecID remap_deprecated_codec_id(enum AVCodecID id)

 {
     switch(id){

         //This is for future deprecatec codec ids, its empty since

         //last major bump but will fill up again over time, please don't remove it

 //         case AV_CODEC_ID_UTVIDEO_DEPRECATED: return AV_CODEC_ID_UTVIDEO;

         case AV_CODEC_ID_OPUS_DEPRECATED: return AV_CODEC_ID_OPUS;

         case AV_CODEC_ID_TAK_DEPRECATED : return AV_CODEC_ID_TAK;

         case AV_CODEC_ID_PCM_S24LE_PLANAR_DEPRECATED : return AV_CODEC_ID_PCM_S24LE_PLANAR;
         case AV_CODEC_ID_PCM_S32LE_PLANAR_DEPRECATED : return AV_CODEC_ID_PCM_S32LE_PLANAR;

         case AV_CODEC_ID_ESCAPE130_DEPRECATED : return AV_CODEC_ID_ESCAPE130;

         case AV_CODEC_ID_G2M_DEPRECATED : return AV_CODEC_ID_G2M;

         case AV_CODEC_ID_WEBP_DEPRECATED: return AV_CODEC_ID_WEBP;

         case AV_CODEC_ID_HEVC_DEPRECATED: return AV_CODEC_ID_HEVC;

         default                         : return id;
     }
 }
 

 static AVCodec *find_encdec(enum AVCodecID id, int encoder)

 {

     AVCodec *p, *experimental = NULL;

     p = first_avcodec;

     id= remap_deprecated_codec_id(id);

     while (p) {

         if ((encoder ? av_codec_is_encoder(p) : av_codec_is_decoder(p)) &&
             p->id == id) {

             if (p->capabilities & CODEC_CAP_EXPERIMENTAL && !experimental) {
                 experimental = p;
             } else
                 return p;
         }

         p = p->next;
     }

     return experimental;

 }
 

 AVCodec *avcodec_find_encoder(enum AVCodecID id)
 {
     return find_encdec(id, 1);
 }
 

 AVCodec *avcodec_find_encoder_by_name(const char *name)
 {
     AVCodec *p;

     if (!name)
         return NULL;

     p = first_avcodec;
     while (p) {

         if (av_codec_is_encoder(p) && strcmp(name, p->name) == 0)

             return p;
         p = p->next;
     }
     return NULL;
 }
 

 AVCodec *avcodec_find_decoder(enum AVCodecID id)

 {

     return find_encdec(id, 0);

 }
 
 AVCodec *avcodec_find_decoder_by_name(const char *name)
 {
     AVCodec *p;

     if (!name)
         return NULL;

     p = first_avcodec;
     while (p) {

         if (av_codec_is_decoder(p) && strcmp(name, p->name) == 0)

             return p;
         p = p->next;
     }
     return NULL;
 }
 

 const char *avcodec_get_name(enum AVCodecID id)

 {

     const AVCodecDescriptor *cd;

     AVCodec *codec;
 

     if (id == AV_CODEC_ID_NONE)
         return "none";

     cd = avcodec_descriptor_get(id);
     if (cd)
         return cd->name;

     av_log(NULL, AV_LOG_WARNING, "Codec 0x%x is not in the full list.\n", id);
     codec = avcodec_find_decoder(id);
     if (codec)
         return codec->name;
     codec = avcodec_find_encoder(id);
     if (codec)
         return codec->name;
     return "unknown_codec";
 }
 

 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
 {
     int i, len, ret = 0;
 

 #define TAG_PRINT(x)                                              \

     (((x) >= '0' && (x) <= '9') ||                                \
      ((x) >= 'a' && (x) <= 'z') || ((x) >= 'A' && (x) <= 'Z') ||  \

      ((x) == '.' || (x) == ' ' || (x) == '-' || (x) == '_'))

     for (i = 0; i < 4; i++) {
         len = snprintf(buf, buf_size,

                        TAG_PRINT(codec_tag & 0xFF) ? "%c" : "[%d]", codec_tag & 0xFF);

         buf        += len;
         buf_size    = buf_size > len ? buf_size - len : 0;
         ret        += len;
         codec_tag >>= 8;

     }
     return ret;
 }
 

 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
 {

     const char *codec_type;

     const char *codec_name;

     const char *profile = NULL;

     const AVCodec *p;

     int bitrate;

     AVRational display_aspect_ratio;

     if (!buf || buf_size <= 0)
         return;
     codec_type = av_get_media_type_string(enc->codec_type);
     codec_name = avcodec_get_name(enc->codec_id);
     if (enc->profile != FF_PROFILE_UNKNOWN) {

         if (enc->codec)
             p = enc->codec;
         else
             p = encode ? avcodec_find_encoder(enc->codec_id) :
                         avcodec_find_decoder(enc->codec_id);

         if (p)
             profile = av_get_profile_name(p, enc->profile);
     }
 

     snprintf(buf, buf_size, "%s: %s", codec_type ? codec_type : "unknown",
              codec_name);

     buf[0] ^= 'a' ^ 'A'; /* first letter in uppercase */

 
     if (enc->codec && strcmp(enc->codec->name, codec_name))
         snprintf(buf + strlen(buf), buf_size - strlen(buf), " (%s)", enc->codec->name);
 

     if (profile)
         snprintf(buf + strlen(buf), buf_size - strlen(buf), " (%s)", profile);
     if (enc->codec_tag) {

         char tag_buf[32];
         av_get_codec_tag_string(tag_buf, sizeof(tag_buf), enc->codec_tag);

         snprintf(buf + strlen(buf), buf_size - strlen(buf),
                  " (%s / 0x%04X)", tag_buf, enc->codec_tag);

     }
 

     switch (enc->codec_type) {

     case AVMEDIA_TYPE_VIDEO:

         if (enc->pix_fmt != AV_PIX_FMT_NONE) {

             char detail[256] = "(";

             const char *colorspace_name;

             snprintf(buf + strlen(buf), buf_size - strlen(buf),
                      ", %s",

                      av_get_pix_fmt_name(enc->pix_fmt));

             if (enc->bits_per_raw_sample &&
                 enc->bits_per_raw_sample <= av_pix_fmt_desc_get(enc->pix_fmt)->comp[0].depth_minus1)

                 av_strlcatf(detail, sizeof(detail), "%d bpc, ", enc->bits_per_raw_sample);

             if (enc->color_range != AVCOL_RANGE_UNSPECIFIED)
                 av_strlcatf(detail, sizeof(detail),
                             enc->color_range == AVCOL_RANGE_MPEG ? "tv, ": "pc, ");

 
             colorspace_name = av_get_colorspace_name(enc->colorspace);
             if (colorspace_name)
                 av_strlcatf(detail, sizeof(detail), "%s, ", colorspace_name);
 

             if (strlen(detail) > 1) {
                 detail[strlen(detail) - 2] = 0;
                 av_strlcatf(buf, buf_size, "%s)", detail);
             }

         }

         if (enc->width) {
             snprintf(buf + strlen(buf), buf_size - strlen(buf),

                      ", %dx%d",
                      enc->width, enc->height);

             if (enc->sample_aspect_ratio.num) {

                 av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,

                           enc->width * enc->sample_aspect_ratio.num,
                           enc->height * enc->sample_aspect_ratio.den,
                           1024 * 1024);

                 snprintf(buf + strlen(buf), buf_size - strlen(buf),

                          " [SAR %d:%d DAR %d:%d]",

                          enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
                          display_aspect_ratio.num, display_aspect_ratio.den);

             }

             if (av_log_get_level() >= AV_LOG_DEBUG) {
                 int g = av_gcd(enc->time_base.num, enc->time_base.den);

                 snprintf(buf + strlen(buf), buf_size - strlen(buf),

                          ", %d/%d",
                          enc->time_base.num / g, enc->time_base.den / g);

             }

         }

         if (encode) {
             snprintf(buf + strlen(buf), buf_size - strlen(buf),
                      ", q=%d-%d", enc->qmin, enc->qmax);
         }

         break;

     case AVMEDIA_TYPE_AUDIO:

         if (enc->sample_rate) {
             snprintf(buf + strlen(buf), buf_size - strlen(buf),

                      ", %d Hz", enc->sample_rate);

         }

         av_strlcat(buf, ", ", buf_size);

         av_get_channel_layout_string(buf + strlen(buf), buf_size - strlen(buf), enc->channels, enc->channel_layout);

         if (enc->sample_fmt != AV_SAMPLE_FMT_NONE) {

             snprintf(buf + strlen(buf), buf_size - strlen(buf),

                      ", %s", av_get_sample_fmt_name(enc->sample_fmt));

         }

         break;

     case AVMEDIA_TYPE_DATA:
         if (av_log_get_level() >= AV_LOG_DEBUG) {
             int g = av_gcd(enc->time_base.num, enc->time_base.den);
             if (g)
                 snprintf(buf + strlen(buf), buf_size - strlen(buf),
                          ", %d/%d",
                          enc->time_base.num / g, enc->time_base.den / g);
         }
         break;

     case AVMEDIA_TYPE_SUBTITLE:
         if (enc->width)
             snprintf(buf + strlen(buf), buf_size - strlen(buf),
                      ", %dx%d", enc->width, enc->height);
         break;

     default:

         return;

     }

     if (encode) {
         if (enc->flags & CODEC_FLAG_PASS1)
             snprintf(buf + strlen(buf), buf_size - strlen(buf),
                      ", pass 1");
         if (enc->flags & CODEC_FLAG_PASS2)
             snprintf(buf + strlen(buf), buf_size - strlen(buf),
                      ", pass 2");
     }

     bitrate = get_bit_rate(enc);

     if (bitrate != 0) {

         snprintf(buf + strlen(buf), buf_size - strlen(buf),

                  ", %d kb/s", bitrate / 1000);

     } else if (enc->rc_max_rate > 0) {
         snprintf(buf + strlen(buf), buf_size - strlen(buf),
                  ", max. %d kb/s", enc->rc_max_rate / 1000);

     }
 }
 

 const char *av_get_profile_name(const AVCodec *codec, int profile)
 {
     const AVProfile *p;
     if (profile == FF_PROFILE_UNKNOWN || !codec->profiles)
         return NULL;
 
     for (p = codec->profiles; p->profile != FF_PROFILE_UNKNOWN; p++)
         if (p->profile == profile)
             return p->name;
 
     return NULL;
 }
 

 unsigned avcodec_version(void)

 {

 //    av_assert0(AV_CODEC_ID_V410==164);
     av_assert0(AV_CODEC_ID_PCM_S8_PLANAR==65563);
     av_assert0(AV_CODEC_ID_ADPCM_G722==69660);
 //     av_assert0(AV_CODEC_ID_BMV_AUDIO==86071);
     av_assert0(AV_CODEC_ID_SRT==94216);

     av_assert0(LIBAVCODEC_VERSION_MICRO >= 100);

     av_assert0(CODEC_ID_CLLC == AV_CODEC_ID_CLLC);
     av_assert0(CODEC_ID_PCM_S8_PLANAR == AV_CODEC_ID_PCM_S8_PLANAR);
     av_assert0(CODEC_ID_ADPCM_IMA_APC == AV_CODEC_ID_ADPCM_IMA_APC);
     av_assert0(CODEC_ID_ILBC == AV_CODEC_ID_ILBC);
     av_assert0(CODEC_ID_SRT == AV_CODEC_ID_SRT);

     return LIBAVCODEC_VERSION_INT;

 }

 const char *avcodec_configuration(void)

 {

     return FFMPEG_CONFIGURATION;

 }
 

 const char *avcodec_license(void)

 {
 #define LICENSE_PREFIX "libavcodec license: "

     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;

 }
 

 void avcodec_flush_buffers(AVCodecContext *avctx)
 {

     if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME)

         ff_thread_flush(avctx);

     else if (avctx->codec->flush)

         avctx->codec->flush(avctx);

 
     avctx->pts_correction_last_pts =
     avctx->pts_correction_last_dts = INT64_MIN;

     if (!avctx->refcounted_frames)

         av_frame_unref(avctx->internal->to_free);

 }
 

 int av_get_exact_bits_per_sample(enum AVCodecID codec_id)

 {

     switch (codec_id) {

     case AV_CODEC_ID_8SVX_EXP:
     case AV_CODEC_ID_8SVX_FIB:

     case AV_CODEC_ID_ADPCM_CT:
     case AV_CODEC_ID_ADPCM_IMA_APC:
     case AV_CODEC_ID_ADPCM_IMA_EA_SEAD:

     case AV_CODEC_ID_ADPCM_IMA_OKI:

     case AV_CODEC_ID_ADPCM_IMA_WS:
     case AV_CODEC_ID_ADPCM_G722:
     case AV_CODEC_ID_ADPCM_YAMAHA:

         return 4;

     case AV_CODEC_ID_PCM_ALAW:
     case AV_CODEC_ID_PCM_MULAW:
     case AV_CODEC_ID_PCM_S8:

     case AV_CODEC_ID_PCM_S8_PLANAR:

     case AV_CODEC_ID_PCM_U8:
     case AV_CODEC_ID_PCM_ZORK:

         return 8;

     case AV_CODEC_ID_PCM_S16BE:

     case AV_CODEC_ID_PCM_S16BE_PLANAR:

     case AV_CODEC_ID_PCM_S16LE:
     case AV_CODEC_ID_PCM_S16LE_PLANAR:
     case AV_CODEC_ID_PCM_U16BE:
     case AV_CODEC_ID_PCM_U16LE:

         return 16;

     case AV_CODEC_ID_PCM_S24DAUD:
     case AV_CODEC_ID_PCM_S24BE:
     case AV_CODEC_ID_PCM_S24LE:

     case AV_CODEC_ID_PCM_S24LE_PLANAR:

     case AV_CODEC_ID_PCM_U24BE:
     case AV_CODEC_ID_PCM_U24LE:

         return 24;

     case AV_CODEC_ID_PCM_S32BE:
     case AV_CODEC_ID_PCM_S32LE:

     case AV_CODEC_ID_PCM_S32LE_PLANAR:

     case AV_CODEC_ID_PCM_U32BE:
     case AV_CODEC_ID_PCM_U32LE:
     case AV_CODEC_ID_PCM_F32BE:
     case AV_CODEC_ID_PCM_F32LE:

         return 32;

     case AV_CODEC_ID_PCM_F64BE:
     case AV_CODEC_ID_PCM_F64LE:

         return 64;

     default:
         return 0;
     }
 }
 

 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be)

 {

     static const enum AVCodecID map[AV_SAMPLE_FMT_NB][2] = {
         [AV_SAMPLE_FMT_U8  ] = { AV_CODEC_ID_PCM_U8,    AV_CODEC_ID_PCM_U8    },
         [AV_SAMPLE_FMT_S16 ] = { AV_CODEC_ID_PCM_S16LE, AV_CODEC_ID_PCM_S16BE },
         [AV_SAMPLE_FMT_S32 ] = { AV_CODEC_ID_PCM_S32LE, AV_CODEC_ID_PCM_S32BE },
         [AV_SAMPLE_FMT_FLT ] = { AV_CODEC_ID_PCM_F32LE, AV_CODEC_ID_PCM_F32BE },
         [AV_SAMPLE_FMT_DBL ] = { AV_CODEC_ID_PCM_F64LE, AV_CODEC_ID_PCM_F64BE },
         [AV_SAMPLE_FMT_U8P ] = { AV_CODEC_ID_PCM_U8,    AV_CODEC_ID_PCM_U8    },
         [AV_SAMPLE_FMT_S16P] = { AV_CODEC_ID_PCM_S16LE, AV_CODEC_ID_PCM_S16BE },
         [AV_SAMPLE_FMT_S32P] = { AV_CODEC_ID_PCM_S32LE, AV_CODEC_ID_PCM_S32BE },
         [AV_SAMPLE_FMT_FLTP] = { AV_CODEC_ID_PCM_F32LE, AV_CODEC_ID_PCM_F32BE },
         [AV_SAMPLE_FMT_DBLP] = { AV_CODEC_ID_PCM_F64LE, AV_CODEC_ID_PCM_F64BE },

     };
     if (fmt < 0 || fmt >= AV_SAMPLE_FMT_NB)

         return AV_CODEC_ID_NONE;

     if (be < 0 || be > 1)
         be = AV_NE(1, 0);
     return map[fmt][be];

 }
 

 int av_get_bits_per_sample(enum AVCodecID codec_id)

 {
     switch (codec_id) {

     case AV_CODEC_ID_ADPCM_SBPRO_2:

         return 2;

     case AV_CODEC_ID_ADPCM_SBPRO_3:

         return 3;

     case AV_CODEC_ID_ADPCM_SBPRO_4:
     case AV_CODEC_ID_ADPCM_IMA_WAV:
     case AV_CODEC_ID_ADPCM_IMA_QT:
     case AV_CODEC_ID_ADPCM_SWF:
     case AV_CODEC_ID_ADPCM_MS:

         return 4;
     default:
         return av_get_exact_bits_per_sample(codec_id);
     }
 }
 

 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
 {
     int id, sr, ch, ba, tag, bps;
 
     id  = avctx->codec_id;
     sr  = avctx->sample_rate;
     ch  = avctx->channels;
     ba  = avctx->block_align;
     tag = avctx->codec_tag;
     bps = av_get_exact_bits_per_sample(avctx->codec_id);
 
     /* codecs with an exact constant bits per sample */

     if (bps > 0 && ch > 0 && frame_bytes > 0 && ch < 32768 && bps < 32768)
         return (frame_bytes * 8LL) / (bps * ch);

     bps = avctx->bits_per_coded_sample;
 
     /* codecs with a fixed packet duration */
     switch (id) {

     case AV_CODEC_ID_ADPCM_ADX:    return   32;
     case AV_CODEC_ID_ADPCM_IMA_QT: return   64;
     case AV_CODEC_ID_ADPCM_EA_XAS: return  128;
     case AV_CODEC_ID_AMR_NB:

     case AV_CODEC_ID_EVRC:

     case AV_CODEC_ID_GSM:
     case AV_CODEC_ID_QCELP:
     case AV_CODEC_ID_RA_288:       return  160;
     case AV_CODEC_ID_AMR_WB:
     case AV_CODEC_ID_GSM_MS:       return  320;
     case AV_CODEC_ID_MP1:          return  384;
     case AV_CODEC_ID_ATRAC1:       return  512;
     case AV_CODEC_ID_ATRAC3:       return 1024;
     case AV_CODEC_ID_MP2:
     case AV_CODEC_ID_MUSEPACK7:    return 1152;
     case AV_CODEC_ID_AC3:          return 1536;

     }
 
     if (sr > 0) {
         /* calc from sample rate */

         if (id == AV_CODEC_ID_TTA)

             return 256 * sr / 245;
 
         if (ch > 0) {
             /* calc from sample rate and channels */

             if (id == AV_CODEC_ID_BINKAUDIO_DCT)

                 return (480 << (sr / 22050)) / ch;
         }
     }
 
     if (ba > 0) {
         /* calc from block_align */

         if (id == AV_CODEC_ID_SIPR) {

             switch (ba) {
             case 20: return 160;
             case 19: return 144;
             case 29: return 288;
             case 37: return 480;
             }

         } else if (id == AV_CODEC_ID_ILBC) {

             switch (ba) {
             case 38: return 160;
             case 50: return 240;
             }

         }
     }
 
     if (frame_bytes > 0) {
         /* calc from frame_bytes only */

         if (id == AV_CODEC_ID_TRUESPEECH)

             return 240 * (frame_bytes / 32);

         if (id == AV_CODEC_ID_NELLYMOSER)

             return 256 * (frame_bytes / 64);

         if (id == AV_CODEC_ID_RA_144)
             return 160 * (frame_bytes / 20);

         if (id == AV_CODEC_ID_G723_1)
             return 240 * (frame_bytes / 24);

 
         if (bps > 0) {
             /* calc from frame_bytes and bits_per_coded_sample */

             if (id == AV_CODEC_ID_ADPCM_G726)

                 return frame_bytes * 8 / bps;
         }
 
         if (ch > 0) {
             /* calc from frame_bytes and channels */
             switch (id) {

             case AV_CODEC_ID_ADPCM_AFC:
                 return frame_bytes / (9 * ch) * 16;

             case AV_CODEC_ID_ADPCM_DTK:
                 return frame_bytes / (16 * ch) * 28;

             case AV_CODEC_ID_ADPCM_4XM:
             case AV_CODEC_ID_ADPCM_IMA_ISS:

                 return (frame_bytes - 4 * ch) * 2 / ch;

             case AV_CODEC_ID_ADPCM_IMA_SMJPEG:

                 return (frame_bytes - 4) * 2 / ch;

             case AV_CODEC_ID_ADPCM_IMA_AMV:

                 return (frame_bytes - 8) * 2 / ch;

             case AV_CODEC_ID_ADPCM_XA:

                 return (frame_bytes / 128) * 224 / ch;

             case AV_CODEC_ID_INTERPLAY_DPCM:

                 return (frame_bytes - 6 - ch) / ch;

             case AV_CODEC_ID_ROQ_DPCM:

                 return (frame_bytes - 8) / ch;

             case AV_CODEC_ID_XAN_DPCM:

                 return (frame_bytes - 2 * ch) / ch;

             case AV_CODEC_ID_MACE3:

                 return 3 * frame_bytes / ch;

             case AV_CODEC_ID_MACE6:

                 return 6 * frame_bytes / ch;

             case AV_CODEC_ID_PCM_LXF:

                 return 2 * (frame_bytes / (5 * ch));

             case AV_CODEC_ID_IAC:

             case AV_CODEC_ID_IMC:
                 return 4 * frame_bytes / ch;

             }
 
             if (tag) {
                 /* calc from frame_bytes, channels, and codec_tag */

                 if (id == AV_CODEC_ID_SOL_DPCM) {

                     if (tag == 3)
                         return frame_bytes / ch;
                     else
                         return frame_bytes * 2 / ch;
                 }
             }
 
             if (ba > 0) {
                 /* calc from frame_bytes, channels, and block_align */
                 int blocks = frame_bytes / ba;
                 switch (avctx->codec_id) {

                 case AV_CODEC_ID_ADPCM_IMA_WAV:

                     if (bps < 2 || bps > 5)
                         return 0;
                     return blocks * (1 + (ba - 4 * ch) / (bps * ch) * 8);

                 case AV_CODEC_ID_ADPCM_IMA_DK3:

                     return blocks * (((ba - 16) * 2 / 3 * 4) / ch);

                 case AV_CODEC_ID_ADPCM_IMA_DK4:

                     return blocks * (1 + (ba - 4 * ch) * 2 / ch);

                 case AV_CODEC_ID_ADPCM_IMA_RAD:
                     return blocks * ((ba - 4 * ch) * 2 / ch);

                 case AV_CODEC_ID_ADPCM_MS:

                     return blocks * (2 + (ba - 7 * ch) * 2 / ch);
                 }
             }
 
             if (bps > 0) {
                 /* calc from frame_bytes, channels, and bits_per_coded_sample */
                 switch (avctx->codec_id) {

                 case AV_CODEC_ID_PCM_DVD:

                     if(bps<4)
                         return 0;

                     return 2 * (frame_bytes / ((bps * 2 / 8) * ch));

                 case AV_CODEC_ID_PCM_BLURAY:

                     if(bps<4)
                         return 0;

                     return frame_bytes / ((FFALIGN(ch, 2) * bps) / 8);

                 case AV_CODEC_ID_S302M:

                     return 2 * (frame_bytes / ((bps + 4) / 4)) / ch;
                 }
             }
         }
     }
 
     return 0;

 }
 

 #if !HAVE_THREADS

 int ff_thread_init(AVCodecContext *s)
 {

     return -1;
 }

 #endif

 
 unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
 {
     unsigned int n = 0;
 

     while (v >= 0xff) {

         *s++ = 0xff;
         v -= 0xff;
         n++;
     }
     *s = v;
     n++;
     return n;
 }

 int ff_match_2uint16(const uint16_t(*tab)[2], int size, int a, int b)
 {

     int i;

     for (i = 0; i < size && !(tab[i][0] == a && tab[i][1] == b); i++) ;

     return i;
 }
 

 #if FF_API_MISSING_SAMPLE

 FF_DISABLE_DEPRECATION_WARNINGS

 void av_log_missing_feature(void *avc, const char *feature, int want_sample)

 {

     av_log(avc, AV_LOG_WARNING, "%s is not implemented. Update your FFmpeg "

             "version to the newest one from Git. If the problem still "

             "occurs, it means that your file has a feature which has not "

             "been implemented.\n", feature);

     if(want_sample)

         av_log_ask_for_sample(avc, NULL);

 }
 

 void av_log_ask_for_sample(void *avc, const char *msg, ...)

 {

     va_list argument_list;
 
     va_start(argument_list, msg);
 

     if (msg)

         av_vlog(avc, AV_LOG_WARNING, msg, argument_list);

     av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
             "of this file to ftp://upload.ffmpeg.org/MPlayer/incoming/ "
             "and contact the ffmpeg-devel mailing list.\n");

 
     va_end(argument_list);

 }

 FF_ENABLE_DEPRECATION_WARNINGS

 #endif /* FF_API_MISSING_SAMPLE */

 
 static AVHWAccel *first_hwaccel = NULL;

 static AVHWAccel **last_hwaccel = &first_hwaccel;

 
 void av_register_hwaccel(AVHWAccel *hwaccel)
 {

     AVHWAccel **p = last_hwaccel;

     hwaccel->next = NULL;

     while(*p || avpriv_atomic_ptr_cas((void * volatile *)p, NULL, hwaccel))

         p = &(*p)->next;

     last_hwaccel = &hwaccel->next;

 }

 
 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel)
 {
     return hwaccel ? hwaccel->next : first_hwaccel;
 }

 AVHWAccel *ff_find_hwaccel(AVCodecContext *avctx)

 {

     enum AVCodecID codec_id = avctx->codec->id;
     enum AVPixelFormat pix_fmt = avctx->pix_fmt;
 

     AVHWAccel *hwaccel = NULL;

     while ((hwaccel = av_hwaccel_next(hwaccel)))
         if (hwaccel->id == codec_id

             && hwaccel->pix_fmt == pix_fmt)
             return hwaccel;
     return NULL;
 }

 
 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
 {

     if (lockmgr_cb) {
         if (lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY))

             return -1;

         if (lockmgr_cb(&avformat_mutex, AV_LOCK_DESTROY))

             return -1;

     }
 

     lockmgr_cb = cb;

     if (lockmgr_cb) {
         if (lockmgr_cb(&codec_mutex, AV_LOCK_CREATE))

             return -1;

         if (lockmgr_cb(&avformat_mutex, AV_LOCK_CREATE))

             return -1;
     }
     return 0;
 }
 

 int ff_lock_avcodec(AVCodecContext *log_ctx)
 {

     if (lockmgr_cb) {
         if ((*lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))

             return -1;
     }
     entangled_thread_counter++;
     if (entangled_thread_counter != 1) {
         av_log(log_ctx, AV_LOG_ERROR, "Insufficient thread locking around avcodec_open/close()\n");

         if (!lockmgr_cb)
             av_log(log_ctx, AV_LOG_ERROR, "No lock manager is set, please see av_lockmgr_register()\n");

         ff_avcodec_locked = 1;
         ff_unlock_avcodec();

         return AVERROR(EINVAL);
     }
     av_assert0(!ff_avcodec_locked);
     ff_avcodec_locked = 1;
     return 0;
 }
 
 int ff_unlock_avcodec(void)
 {
     av_assert0(ff_avcodec_locked);
     ff_avcodec_locked = 0;
     entangled_thread_counter--;

     if (lockmgr_cb) {
         if ((*lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE))

             return -1;
     }
     return 0;
 }
 

 int avpriv_lock_avformat(void)
 {

     if (lockmgr_cb) {
         if ((*lockmgr_cb)(&avformat_mutex, AV_LOCK_OBTAIN))

             return -1;
     }
     return 0;
 }
 
 int avpriv_unlock_avformat(void)
 {

     if (lockmgr_cb) {
         if ((*lockmgr_cb)(&avformat_mutex, AV_LOCK_RELEASE))

             return -1;

     }
     return 0;
 }

 unsigned int avpriv_toupper4(unsigned int x)

 {

     return av_toupper(x & 0xFF) +
           (av_toupper((x >>  8) & 0xFF) << 8)  +
           (av_toupper((x >> 16) & 0xFF) << 16) +
           (av_toupper((x >> 24) & 0xFF) << 24);

 }

 int ff_thread_ref_frame(ThreadFrame *dst, ThreadFrame *src)
 {
     int ret;
 
     dst->owner = src->owner;
 
     ret = av_frame_ref(dst->f, src->f);
     if (ret < 0)
         return ret;
 
     if (src->progress &&
         !(dst->progress = av_buffer_ref(src->progress))) {
         ff_thread_release_buffer(dst->owner, dst);
         return AVERROR(ENOMEM);
     }
 
     return 0;
 }
 

 #if !HAVE_THREADS

 enum AVPixelFormat ff_thread_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
 {
     return avctx->get_format(avctx, fmt);
 }
 

 int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)

 {
     f->owner = avctx;

     return ff_get_buffer(avctx, f->f, flags);

 }