/*
  * 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 "libavutil/avassert.h"

 #include "libavutil/avstring.h"

 #include "libavutil/crc.h"

 #include "libavutil/mathematics.h"

 #include "libavutil/pixdesc.h"

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

 #include "libavutil/dict.h"

 #include "libavutil/avassert.h"

 #include "avcodec.h"

 #include "dsputil.h"

 #include "libavutil/opt.h"

 #include "imgconvert.h"

 #include "thread.h"

 #include "audioconvert.h"

 #include "internal.h"

 #include "bytestream.h"

 #include <stdlib.h>

 #include <stdarg.h>

 #include <limits.h>

 #include <float.h>

 static int volatile entangled_thread_counter=0;

 static int (*ff_lockmgr_cb)(void **mutex, enum AVLockOp op);

 static void *codec_mutex;

 static void *avformat_mutex;

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

 {

     if(min_size < *size)

         return ptr;

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

     ptr= av_realloc(ptr, min_size);

     if(!ptr) //we could set this to the unmodified min_size but this is safer if the user lost the ptr and uses NULL now

         min_size= 0;
 
     *size= min_size;

 
     return ptr;

 }
 

 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_malloc(void *ptr, unsigned int *size, size_t min_size)
 {
     ff_fast_malloc(ptr, size, min_size, 0);
 }
 
 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);

 }
 

 /* encoder management */

 static AVCodec *first_avcodec = NULL;

 AVCodec *av_codec_next(AVCodec *c){
     if(c) return c->next;
     else  return first_avcodec;
 }
 

 static void avcodec_init(void)

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

     ff_dsputil_static_init();

 }
 

 int av_codec_is_encoder(AVCodec *codec)

 {
     return codec && (codec->encode || codec->encode2);
 }
 

 int av_codec_is_decoder(AVCodec *codec)

 {
     return codec && codec->decode;
 }
 

 void avcodec_register(AVCodec *codec)

 {
     AVCodec **p;

     avcodec_init();

     p = &first_avcodec;
     while (*p != NULL) p = &(*p)->next;

     *p = codec;
     codec->next = NULL;

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

 }
 

 unsigned avcodec_get_edge_width(void)
 {
     return EDGE_WIDTH;
 }
 

 void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
     s->coded_width = width;
     s->coded_height= height;
     s->width = -((-width )>>s->lowres);
     s->height= -((-height)>>s->lowres);
 }
 

 #define INTERNAL_BUFFER_SIZE (32+1)

 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 PIX_FMT_YUV420P:

     case PIX_FMT_YUYV422:

     case PIX_FMT_UYVY422:

     case PIX_FMT_YUV422P:

     case PIX_FMT_YUV440P:

     case PIX_FMT_YUV444P:

     case PIX_FMT_GBRP:

     case PIX_FMT_GRAY8:

     case PIX_FMT_GRAY16BE:
     case PIX_FMT_GRAY16LE:

     case PIX_FMT_YUVJ420P:
     case PIX_FMT_YUVJ422P:

     case PIX_FMT_YUVJ440P:

     case PIX_FMT_YUVJ444P:

     case PIX_FMT_YUVA420P:

     case PIX_FMT_YUVA444P:

     case PIX_FMT_YUV420P9LE:
     case PIX_FMT_YUV420P9BE:
     case PIX_FMT_YUV420P10LE:
     case PIX_FMT_YUV420P10BE:

     case PIX_FMT_YUV422P9LE:
     case PIX_FMT_YUV422P9BE:

     case PIX_FMT_YUV422P10LE:
     case PIX_FMT_YUV422P10BE:

     case PIX_FMT_YUV444P9LE:
     case PIX_FMT_YUV444P9BE:
     case PIX_FMT_YUV444P10LE:
     case PIX_FMT_YUV444P10BE:

     case PIX_FMT_GBRP9LE:
     case PIX_FMT_GBRP9BE:
     case PIX_FMT_GBRP10LE:
     case PIX_FMT_GBRP10BE:

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

         break;
     case PIX_FMT_YUV411P:

     case PIX_FMT_UYYVYY411:

         w_align=32;
         h_align=8;
         break;
     case PIX_FMT_YUV410P:
         if(s->codec_id == CODEC_ID_SVQ1){
             w_align=64;
             h_align=64;
         }

     case PIX_FMT_RGB555:
         if(s->codec_id == CODEC_ID_RPZA){
             w_align=4;
             h_align=4;
         }
     case PIX_FMT_PAL8:

     case PIX_FMT_BGR8:
     case PIX_FMT_RGB8:

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

         break;

     case PIX_FMT_BGR24:
         if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){
             w_align=4;
             h_align=4;
         }
         break;

     default:
         w_align= 1;
         h_align= 1;
         break;
     }
 

     if(s->codec_id == CODEC_ID_IFF_ILBM || s->codec_id == CODEC_ID_IFF_BYTERUN1){
         w_align= FFMAX(w_align, 8);
     }
 

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

     if(s->codec_id == CODEC_ID_H264 || s->lowres)

         *height+=2; // some of the optimized chroma MC reads one line too much

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

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

         linesize_align[i] = STRIDE_ALIGN;

 }
 
 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
     int chroma_shift = av_pix_fmt_descriptors[s->pix_fmt].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);

 }
 

 void ff_init_buffer_info(AVCodecContext *s, AVFrame *pic)
 {
     if (s->pkt) {
         pic->pkt_pts = s->pkt->pts;
         pic->pkt_pos = s->pkt->pos;
     } else {
         pic->pkt_pts = AV_NOPTS_VALUE;
         pic->pkt_pos = -1;
     }
     pic->reordered_opaque= s->reordered_opaque;
     pic->sample_aspect_ratio = s->sample_aspect_ratio;
     pic->width               = s->width;
     pic->height              = s->height;
     pic->format              = s->pix_fmt;
 }
 

 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 audio_get_buffer(AVCodecContext *avctx, AVFrame *frame)
 {
     AVCodecInternal *avci = avctx->internal;
     InternalBuffer *buf;

     int buf_size, ret;

 
     buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
                                           frame->nb_samples, avctx->sample_fmt,
                                           32);
     if (buf_size < 0)
         return AVERROR(EINVAL);
 
     /* allocate InternalBuffer if needed */
     if (!avci->buffer) {
         avci->buffer = av_mallocz(sizeof(InternalBuffer));
         if (!avci->buffer)
             return AVERROR(ENOMEM);
     }
     buf = avci->buffer;
 
     /* if there is a previously-used internal buffer, check its size and
        channel count to see if we can reuse it */
     if (buf->extended_data) {
         /* if current buffer is too small, free it */
         if (buf->extended_data[0] && buf_size > buf->audio_data_size) {
             av_free(buf->extended_data[0]);
             if (buf->extended_data != buf->data)

                 av_freep(&buf->extended_data);

             buf->extended_data = NULL;
             buf->data[0] = NULL;
         }
         /* if number of channels has changed, reset and/or free extended data
            pointers but leave data buffer in buf->data[0] for reuse */
         if (buf->nb_channels != avctx->channels) {
             if (buf->extended_data != buf->data)
                 av_free(buf->extended_data);
             buf->extended_data = NULL;
         }
     }
 
     /* if there is no previous buffer or the previous buffer cannot be used
        as-is, allocate a new buffer and/or rearrange the channel pointers */
     if (!buf->extended_data) {

         if (!buf->data[0]) {
             if (!(buf->data[0] = av_mallocz(buf_size)))

                 return AVERROR(ENOMEM);

             buf->audio_data_size = buf_size;

         }

         if ((ret = avcodec_fill_audio_frame(frame, avctx->channels,
                                             avctx->sample_fmt, buf->data[0],
                                             buf->audio_data_size, 32)))

             return ret;
 

         if (frame->extended_data == frame->data)
             buf->extended_data = buf->data;
         else
             buf->extended_data = frame->extended_data;
         memcpy(buf->data, frame->data, sizeof(frame->data));
         buf->linesize[0] = frame->linesize[0];
         buf->nb_channels = avctx->channels;
     } else {
         /* copy InternalBuffer info to the AVFrame */
         frame->extended_data = buf->extended_data;
         frame->linesize[0]   = buf->linesize[0];
         memcpy(frame->data, buf->data, sizeof(frame->data));

     }
 
     frame->type          = FF_BUFFER_TYPE_INTERNAL;
 

     if (avctx->pkt) {
         frame->pkt_pts = avctx->pkt->pts;
         frame->pkt_pos = avctx->pkt->pos;
     } else {
         frame->pkt_pts = AV_NOPTS_VALUE;
         frame->pkt_pos = -1;
     }
 

     frame->reordered_opaque = avctx->reordered_opaque;
 
     if (avctx->debug & FF_DEBUG_BUFFERS)
         av_log(avctx, AV_LOG_DEBUG, "default_get_buffer called on frame %p, "
                "internal audio buffer used\n", frame);
 
     return 0;
 }
 
 static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
 {

     int i;

     int w= s->width;
     int h= s->height;

     InternalBuffer *buf;

     AVCodecInternal *avci = s->internal;

     if(pic->data[0]!=NULL) {
         av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");
         return -1;
     }

     if(avci->buffer_count >= INTERNAL_BUFFER_SIZE) {
         av_log(s, AV_LOG_ERROR, "buffer_count overflow (missing release_buffer?)\n");

         return -1;
     }

     if(av_image_check_size(w, h, 0, s) || s->pix_fmt<0)

         return -1;
 

     if (!avci->buffer) {
         avci->buffer = av_mallocz((INTERNAL_BUFFER_SIZE+1) *
                                   sizeof(InternalBuffer));

     }

     buf = &avci->buffer[avci->buffer_count];

     if(buf->base[0] && (buf->width != w || buf->height != h || buf->pix_fmt != s->pix_fmt)){

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

             av_freep(&buf->base[i]);
             buf->data[i]= NULL;
         }
     }
 

     if (!buf->base[0]) {

         int h_chroma_shift, v_chroma_shift;

         int size[4] = {0};
         int tmpsize;

         int unaligned;

         AVPicture picture;

         int stride_align[AV_NUM_DATA_POINTERS];

         const int pixel_size = av_pix_fmt_descriptors[s->pix_fmt].comp[0].step_minus1+1;

         avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);

         avcodec_align_dimensions2(s, &w, &h, stride_align);

         if(!(s->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, s->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] % stride_align[i];

             }

         } while (unaligned);

         tmpsize = av_image_fill_pointers(picture.data, s->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]);

 
         memset(buf->base, 0, sizeof(buf->base));
         memset(buf->data, 0, sizeof(buf->data));

         for(i=0; i<4 && size[i]; i++){

             const int h_shift= i==0 ? 0 : h_chroma_shift;
             const int v_shift= i==0 ? 0 : v_chroma_shift;

             buf->linesize[i]= picture.linesize[i];

             buf->base[i]= av_malloc(size[i]+16); //FIXME 16

             if(buf->base[i]==NULL) return -1;

             memset(buf->base[i], 128, size[i]);
 

             // no edge if EDGE EMU or not planar YUV

             if((s->flags&CODEC_FLAG_EMU_EDGE) || !size[2])

                 buf->data[i] = buf->base[i];

             else

                 buf->data[i] = buf->base[i] + FFALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (pixel_size*EDGE_WIDTH>>h_shift), stride_align[i]);

         }

         for (; i < AV_NUM_DATA_POINTERS; i++) {
             buf->base[i] = buf->data[i] = NULL;
             buf->linesize[i] = 0;
         }

         if(size[1] && !size[2])

             ff_set_systematic_pal2((uint32_t*)buf->data[1], s->pix_fmt);

         buf->width  = s->width;
         buf->height = s->height;
         buf->pix_fmt= s->pix_fmt;

     }

     pic->type= FF_BUFFER_TYPE_INTERNAL;

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

         pic->base[i]= buf->base[i];
         pic->data[i]= buf->data[i];

         pic->linesize[i]= buf->linesize[i];

     }

     pic->extended_data = pic->data;

     avci->buffer_count++;

     pic->width  = buf->width;
     pic->height = buf->height;
     pic->format = buf->pix_fmt;
     pic->sample_aspect_ratio = s->sample_aspect_ratio;

     if (s->pkt) {
         pic->pkt_pts = s->pkt->pts;
         pic->pkt_pos = s->pkt->pos;
     } else {
         pic->pkt_pts = AV_NOPTS_VALUE;
         pic->pkt_pos = -1;
     }

     pic->reordered_opaque= s->reordered_opaque;

     pic->sample_aspect_ratio = s->sample_aspect_ratio;
     pic->width               = s->width;
     pic->height              = s->height;
     pic->format              = s->pix_fmt;

     if(s->debug&FF_DEBUG_BUFFERS)

         av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p, %d "
                "buffers used\n", pic, avci->buffer_count);

     return 0;
 }
 

 int avcodec_default_get_buffer(AVCodecContext *avctx, AVFrame *frame)
 {
     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;
     }
 }
 

 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){

     int i;

     InternalBuffer *buf, *last;

     AVCodecInternal *avci = s->internal;

     assert(s->codec_type == AVMEDIA_TYPE_VIDEO);
 

     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);

     assert(avci->buffer_count);
 
     if (avci->buffer) {
         buf = NULL; /* avoids warning */
         for (i = 0; i < avci->buffer_count; i++) { //just 3-5 checks so is not worth to optimize
             buf = &avci->buffer[i];
             if (buf->data[0] == pic->data[0])
                 break;
         }
         assert(i < avci->buffer_count);
         avci->buffer_count--;
         last = &avci->buffer[avci->buffer_count];

         if (buf != last)
             FFSWAP(InternalBuffer, *buf, *last);

     }

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

         pic->data[i]=NULL;

 //        pic->base[i]=NULL;
     }

 //printf("R%X\n", pic->opaque);

 
     if(s->debug&FF_DEBUG_BUFFERS)

         av_log(s, AV_LOG_DEBUG, "default_release_buffer called on pic %p, %d "
                "buffers used\n", pic, avci->buffer_count);

 }
 

 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
     AVFrame temp_pic;
     int i;
 

     assert(s->codec_type == AVMEDIA_TYPE_VIDEO);
 

     if (pic->data[0] && (pic->width != s->width || pic->height != s->height || pic->format != s->pix_fmt)) {

         av_log(s, AV_LOG_WARNING, "Picture changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s in reget buffer()\n",
                pic->width, pic->height, av_get_pix_fmt_name(pic->format), s->width, s->height, av_get_pix_fmt_name(s->pix_fmt));

         s->release_buffer(s, pic);
     }
 

     ff_init_buffer_info(s, pic);
 

     /* If no picture return a new buffer */
     if(pic->data[0] == NULL) {
         /* We will copy from buffer, so must be readable */
         pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
         return s->get_buffer(s, pic);
     }
 

     assert(s->pix_fmt == pic->format);

     /* If internal buffer type return the same buffer */

     if(pic->type == FF_BUFFER_TYPE_INTERNAL) {

         return 0;

     }

 
     /*
      * Not internal type and reget_buffer not overridden, emulate cr buffer
      */
     temp_pic = *pic;

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

         pic->data[i] = pic->base[i] = NULL;
     pic->opaque = NULL;
     /* Allocate new frame */
     if (s->get_buffer(s, pic))
         return -1;
     /* Copy image data from old buffer to new buffer */

     av_picture_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,

              s->height);
     s->release_buffer(s, &temp_pic); // Release old frame
     return 0;
 }
 

 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;
 }
 

 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat *fmt){
     while (*fmt != PIX_FMT_NONE && ff_is_hwaccel_pix_fmt(*fmt))
         ++fmt;

     return fmt[0];
 }
 

 void avcodec_get_frame_defaults(AVFrame *pic){
     memset(pic, 0, sizeof(AVFrame));
 

     pic->pts = pic->pkt_dts = pic->pkt_pts = pic->best_effort_timestamp = AV_NOPTS_VALUE;

     pic->pkt_pos = -1;

     pic->key_frame= 1;

     pic->sample_aspect_ratio = (AVRational){0, 1};

     pic->format = -1;           /* unknown */

 }
 

 AVFrame *avcodec_alloc_frame(void){

     AVFrame *pic= av_malloc(sizeof(AVFrame));

     if(pic==NULL) return NULL;

     avcodec_get_frame_defaults(pic);

     return pic;
 }
 

 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;
 }
 

 #if FF_API_AVCODEC_OPEN

 int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)

 {

     return avcodec_open2(avctx, codec, NULL);
 }
 #endif
 
 int attribute_align_arg avcodec_open2(AVCodecContext *avctx, 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);

     /* If there is a user-supplied mutex locking routine, call it. */
     if (ff_lockmgr_cb) {
         if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
             return -1;
     }
 

     entangled_thread_counter++;
     if(entangled_thread_counter != 1){
         av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");

         ret = -1;

         goto end;
     }

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

     if (codec->capabilities & CODEC_CAP_EXPERIMENTAL)
         if (avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
             av_log(avctx, AV_LOG_ERROR, "Codec is experimental but experimental codecs are not enabled, see -strict -2\n");
             ret = -1;
             goto free_and_end;
         }
 

     //We only call avcodec_set_dimensions() for non h264 codecs so as not to overwrite previously setup dimensions
     if(!( avctx->coded_width && avctx->coded_height && avctx->width && avctx->height && avctx->codec_id == CODEC_ID_H264)){

     if(avctx->coded_width && avctx->coded_height)
         avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
     else if(avctx->width && avctx->height)
         avcodec_set_dimensions(avctx, avctx->width, avctx->height);

     }

     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");
         avcodec_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);
 

 #define SANE_NB_CHANNELS 128U

     if (avctx->channels > 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 == 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;

     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 (HAVE_THREADS && !avctx->thread_opaque) {

         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->codec->sample_fmts[i] == AV_SAMPLE_FMT_NONE) {
                 av_log(avctx, AV_LOG_ERROR, "Specified sample_fmt is not supported.\n");
                 ret = AVERROR(EINVAL);
                 goto free_and_end;
             }

         }

         if (avctx->codec->pix_fmts) {
             for (i = 0; avctx->codec->pix_fmts[i] != PIX_FMT_NONE; i++)
                 if (avctx->pix_fmt == avctx->codec->pix_fmts[i])
                     break;
             if (avctx->codec->pix_fmts[i] == PIX_FMT_NONE) {
                 av_log(avctx, AV_LOG_ERROR, "Specified pix_fmt is not supported\n");
                 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 is not supported\n");
                 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) {
                     av_log(avctx, AV_LOG_ERROR, "Specified channel_layout is not supported\n");
                     ret = AVERROR(EINVAL);
                     goto free_and_end;
                 }
             }
         }

         if (avctx->channel_layout && avctx->channels) {
             if (av_get_channel_layout_nb_channels(avctx->channel_layout) != avctx->channels) {
                 av_log(avctx, AV_LOG_ERROR, "channel layout does not match number of channels\n");
                 ret = AVERROR(EINVAL);
                 goto free_and_end;
             }

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

         }
     }

     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)){

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

             goto free_and_end;

         }

     }

     if (av_codec_is_decoder(avctx->codec) && !avctx->bit_rate)

         avctx->bit_rate = get_bit_rate(avctx);
 

     ret=0;
 end:
     entangled_thread_counter--;

 
     /* Release any user-supplied mutex. */
     if (ff_lockmgr_cb) {
         (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
     }

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

     return ret;

 free_and_end:

     av_dict_free(&tmp);

     av_freep(&avctx->priv_data);

     av_freep(&avctx->internal);

     avctx->codec= NULL;
     goto end;

 }
 

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

 {

     if (size < 0 || avpkt->size < 0 || size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE) {
         av_log(avctx, AV_LOG_ERROR, "Size %d invalid\n", size);

         return AVERROR(EINVAL);

     }

     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) {

         void *destruct = avpkt->destruct;

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

             return AVERROR(EINVAL);

         }

 
         av_init_packet(avpkt);

         avpkt->destruct = destruct;

         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 %d\n", size);
         return ret;

     }

 }
 

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

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

     AVPacket user_pkt = *avpkt;

     int nb_samples;

     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);
         avpkt->size = 0;

         return 0;

     }
 
     /* check for valid frame size */
     if (frame) {
         nb_samples = frame->nb_samples;
         if (avctx->codec->capabilities & CODEC_CAP_SMALL_LAST_FRAME) {
             if (nb_samples > avctx->frame_size)
                 return AVERROR(EINVAL);
         } else if (!(avctx->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)) {
             if (nb_samples != avctx->frame_size)
                 return AVERROR(EINVAL);
         }
     } else {
         nb_samples = avctx->frame_size;
     }
 
     if (avctx->codec->encode2) {
         ret = avctx->codec->encode2(avctx, avpkt, frame, got_packet_ptr);

         if (!ret && *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;

         }
     } else {
         /* for compatibility with encoders not supporting encode2(), we need to
            allocate a packet buffer if the user has not provided one or check
            the size otherwise */
         int fs_tmp   = 0;
         int buf_size = avpkt->size;

         if (!user_pkt.data) {

             if (avctx->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE) {
                 av_assert0(av_get_bits_per_sample(avctx->codec_id) != 0);

                 if (!frame)
                     return AVERROR(EINVAL);

                 buf_size = nb_samples * avctx->channels *
                            av_get_bits_per_sample(avctx->codec_id) / 8;
             } else {
                 /* this is a guess as to the required size.
                    if an encoder needs more than this, it should probably
                    implement encode2() */
                 buf_size = 2 * avctx->frame_size * avctx->channels *
                            av_get_bytes_per_sample(avctx->sample_fmt);

                 buf_size += 2*FF_MIN_BUFFER_SIZE;

             }
         }

         if ((ret = ff_alloc_packet2(avctx, avpkt, buf_size)))

             return ret;
 
         /* Encoders using AVCodec.encode() that support
            CODEC_CAP_SMALL_LAST_FRAME require avctx->frame_size to be set to
            the smaller size when encoding the last frame.
            This code can be removed once all encoders supporting
            CODEC_CAP_SMALL_LAST_FRAME use encode2() */
         if ((avctx->codec->capabilities & CODEC_CAP_SMALL_LAST_FRAME) &&
             nb_samples < avctx->frame_size) {
             fs_tmp = avctx->frame_size;
             avctx->frame_size = nb_samples;
         }
 
         /* encode the frame */
         ret = avctx->codec->encode(avctx, avpkt->data, avpkt->size,
                                    frame ? frame->data[0] : NULL);
         if (ret >= 0) {
             if (!ret) {
                 /* no output. if the packet data was allocated by libavcodec,
                    free it */

                 if (!user_pkt.data && avpkt->data != avctx->internal->byte_buffer)

                     av_freep(&avpkt->data);
             } else {
                 if (avctx->coded_frame)

                     avpkt->pts = avpkt->dts = avctx->coded_frame->pts;

                 /* Set duration for final small packet. This can be removed
                    once all encoders supporting CODEC_CAP_SMALL_LAST_FRAME use
                    encode2() */
                 if (fs_tmp) {

                     avpkt->duration = ff_samples_to_time_base(avctx,
                                                               avctx->frame_size);

                 }
             }
             avpkt->size = ret;
             *got_packet_ptr = (ret > 0);
             ret = 0;
         }
 
         if (fs_tmp)
             avctx->frame_size = fs_tmp;
     }

     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->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) {

             uint8_t *new_data = av_realloc(avpkt->data, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);

             if (new_data)
                 avpkt->data = new_data;
         }
 

         avctx->frame_number++;

     }

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

     /* 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;
 
     return ret;

 }
 

 #if FF_API_OLD_DECODE_AUDIO
 int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx,
                                              uint8_t *buf, int buf_size,
                                              const short *samples)
 {
     AVPacket pkt;
     AVFrame frame0;
     AVFrame *frame;
     int ret, samples_size, got_packet;
 
     av_init_packet(&pkt);
     pkt.data = buf;
     pkt.size = buf_size;
 
     if (samples) {
         frame = &frame0;
         avcodec_get_frame_defaults(frame);
 
         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");
                 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)
                 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)))

             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 */

     ff_packet_free_side_data(&pkt);

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

         av_freep(&frame->extended_data);

 
     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 (!(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->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 &&

             avpkt->destruct == av_destruct_packet) {
             uint8_t *new_data = av_realloc(avpkt->data, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);

             if (new_data)
                 avpkt->data = new_data;
         }
 

         avctx->frame_number++;

     }

     if (ret < 0 || !*got_packet_ptr)
         av_free_packet(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(avctx, buf, buf_size, (void *)(intptr_t)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;
     }
     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;
     }
     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 void apply_param_change(AVCodecContext *avctx, AVPacket *avpkt)
 {
     int size = 0;
     const uint8_t *data;
     uint32_t flags;
 
     if (!(avctx->codec->capabilities & CODEC_CAP_PARAM_CHANGE))
         return;
 
     data = av_packet_get_side_data(avpkt, AV_PKT_DATA_PARAM_CHANGE, &size);
     if (!data || size < 4)
         return;
     flags = bytestream_get_le32(&data);
     size -= 4;
     if (size < 4) /* Required for any of the changes */
         return;
     if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {
         avctx->channels = bytestream_get_le32(&data);
         size -= 4;
     }
     if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) {
         if (size < 8)
             return;
         avctx->channel_layout = bytestream_get_le64(&data);
         size -= 8;
     }
     if (size < 4)
         return;
     if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {
         avctx->sample_rate = bytestream_get_le32(&data);
         size -= 4;
     }
     if (flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) {
         if (size < 8)
             return;
         avctx->width  = bytestream_get_le32(&data);
         avctx->height = bytestream_get_le32(&data);

         avcodec_set_dimensions(avctx, avctx->width, avctx->height);

         size -= 8;
     }
 }
 

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

                          const AVPacket *avpkt)

 {

     int ret;

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

     *got_picture_ptr= 0;

     if((avctx->coded_width||avctx->coded_height) && av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx))

         return -1;

     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);
         apply_param_change(avctx, &tmp);
         avctx->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){

             picture->pkt_pos= avpkt->pos;

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

             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 == PIX_FMT_NONE)
                 picture->format = avctx->pix_fmt;

         }

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

         avctx->pkt = NULL;
         if (did_split)
             ff_packet_free_side_data(&tmp);

         if (*got_picture_ptr){

             avctx->frame_number++;

             picture->best_effort_timestamp = guess_correct_pts(avctx,
                                                             picture->pkt_pts,
                                                             picture->pkt_dts);
         }

     }else
         ret= 0;
 

     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;
     int ret, got_frame = 0;
 
     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);
             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;
     }
     return ret;
 }
 #endif
 
 int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
                                               AVFrame *frame,
                                               int *got_frame_ptr,
                                               AVPacket *avpkt)
 {
     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->capabilities & CODEC_CAP_DELAY) || avpkt->size) {

         av_packet_split_side_data(avpkt);

         apply_param_change(avctx, avpkt);
 

         avctx->pkt = avpkt;

         ret = avctx->codec->decode(avctx, frame, got_frame_ptr, avpkt);
         if (ret >= 0 && *got_frame_ptr) {
             avctx->frame_number++;
             frame->pkt_dts = avpkt->dts;

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

         }

     }

     return ret;
 }
 

 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
                             int *got_sub_ptr,
                             AVPacket *avpkt)
 {

     int ret;
 

     avctx->pkt = avpkt;

     *got_sub_ptr = 0;

     avcodec_get_subtitle_defaults(sub);

     ret = avctx->codec->decode(avctx, sub, got_sub_ptr, avpkt);

     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 avcodec_close(AVCodecContext *avctx)

 {

     /* If there is a user-supplied mutex locking routine, call it. */
     if (ff_lockmgr_cb) {
         if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
             return -1;
     }
 

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

     if (avcodec_is_open(avctx)) {
         if (HAVE_THREADS && avctx->thread_opaque)
             ff_thread_free(avctx);
         if (avctx->codec && avctx->codec->close)
             avctx->codec->close(avctx);
         avcodec_default_free_buffers(avctx);
         avctx->coded_frame = NULL;

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

         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;

     entangled_thread_counter--;

 
     /* Release any user-supplied mutex. */
     if (ff_lockmgr_cb) {
         (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
     }

     return 0;
 }
 

 static enum CodecID remap_deprecated_codec_id(enum CodecID id)
 {
     switch(id){

         //This is for future deprecatec codec ids, its empty since
         //last major bump but will fill up again over time, please dont remove it
 //         case CODEC_ID_UTVIDEO_DEPRECATED: return CODEC_ID_UTVIDEO;

         default                         : return id;
     }
 }
 

 AVCodec *avcodec_find_encoder(enum CodecID id)
 {

     AVCodec *p, *experimental=NULL;

     p = first_avcodec;

     id= remap_deprecated_codec_id(id);

     while (p) {

         if (av_codec_is_encoder(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_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 CodecID id)
 {

     AVCodec *p, *experimental=NULL;

     p = first_avcodec;

     id= remap_deprecated_codec_id(id);

     while (p) {

         if (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_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 CodecID id)
 {
     AVCodec *codec;
 
 #if !CONFIG_SMALL
     switch (id) {
 #include "libavcodec/codec_names.h"
     }
     av_log(NULL, AV_LOG_WARNING, "Codec 0x%x is not in the full list.\n", id);
 #endif
     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;
 
     for (i = 0; i < 4; i++) {
         len = snprintf(buf, buf_size,
                        isprint(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;

     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) {
         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%s", codec_type ? codec_type : "unknown",
              codec_name, enc->mb_decision ? " (hq)" : "");
     buf[0] ^= 'a' ^ 'A'; /* first letter in uppercase */
     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 != PIX_FMT_NONE) {

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

                      av_get_pix_fmt_name(enc->pix_fmt));

         }

         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;
     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);

     }
 }
 

 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(CODEC_ID_V410==164);

     av_assert0(CODEC_ID_PCM_S8_PLANAR==65563);
     av_assert0(CODEC_ID_ADPCM_G722==69660);

 //     av_assert0(CODEC_ID_BMV_AUDIO==86071);

     av_assert0(CODEC_ID_SRT==94216);

     av_assert0(LIBAVCODEC_VERSION_MICRO >= 100);

   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);

 }
 

 static void video_free_buffers(AVCodecContext *s)
 {

     AVCodecInternal *avci = s->internal;

     int i, j;
 

     if (!avci->buffer)
         return;

     if (avci->buffer_count)
         av_log(s, AV_LOG_WARNING, "Found %i unreleased buffers!\n",
                avci->buffer_count);

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

         InternalBuffer *buf = &avci->buffer[i];

         for(j=0; j<4; j++){
             av_freep(&buf->base[j]);
             buf->data[j]= NULL;
         }
     }

     av_freep(&avci->buffer);

     avci->buffer_count=0;

 }
 

 static void audio_free_buffers(AVCodecContext *avctx)
 {
     AVCodecInternal *avci = avctx->internal;
     InternalBuffer *buf;
 
     if (!avci->buffer)
         return;
     buf = avci->buffer;
 
     if (buf->extended_data) {
         av_free(buf->extended_data[0]);
         if (buf->extended_data != buf->data)

             av_freep(&buf->extended_data);

     }
     av_freep(&avci->buffer);
 }
 
 void avcodec_default_free_buffers(AVCodecContext *avctx)
 {
     switch (avctx->codec_type) {
     case AVMEDIA_TYPE_VIDEO:
         video_free_buffers(avctx);
         break;
     case AVMEDIA_TYPE_AUDIO:
         audio_free_buffers(avctx);
         break;
     default:
         break;
     }
 }
 

 int av_get_exact_bits_per_sample(enum CodecID codec_id)
 {

     switch(codec_id){

     case CODEC_ID_ADPCM_CT:

     case CODEC_ID_ADPCM_IMA_APC:

     case CODEC_ID_ADPCM_IMA_EA_SEAD:
     case CODEC_ID_ADPCM_IMA_WS:

     case CODEC_ID_ADPCM_G722:

     case CODEC_ID_ADPCM_YAMAHA:

         return 4;

     case CODEC_ID_PCM_ALAW:
     case CODEC_ID_PCM_MULAW:
     case CODEC_ID_PCM_S8:
     case CODEC_ID_PCM_U8:

     case CODEC_ID_PCM_ZORK:

         return 8;
     case CODEC_ID_PCM_S16BE:
     case CODEC_ID_PCM_S16LE:

     case CODEC_ID_PCM_S16LE_PLANAR:

     case CODEC_ID_PCM_U16BE:
     case CODEC_ID_PCM_U16LE:
         return 16;
     case CODEC_ID_PCM_S24DAUD:
     case CODEC_ID_PCM_S24BE:
     case CODEC_ID_PCM_S24LE:
     case CODEC_ID_PCM_U24BE:
     case CODEC_ID_PCM_U24LE:
         return 24;
     case CODEC_ID_PCM_S32BE:
     case CODEC_ID_PCM_S32LE:
     case CODEC_ID_PCM_U32BE:
     case CODEC_ID_PCM_U32LE:

     case CODEC_ID_PCM_F32BE:

     case CODEC_ID_PCM_F32LE:

         return 32;

     case CODEC_ID_PCM_F64BE:
     case CODEC_ID_PCM_F64LE:
         return 64;

     default:
         return 0;
     }
 }
 

 enum CodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be)
 {
     static const enum CodecID map[AV_SAMPLE_FMT_NB][2] = {
         [AV_SAMPLE_FMT_U8  ] = { CODEC_ID_PCM_U8,    CODEC_ID_PCM_U8    },
         [AV_SAMPLE_FMT_S16 ] = { CODEC_ID_PCM_S16LE, CODEC_ID_PCM_S16BE },
         [AV_SAMPLE_FMT_S32 ] = { CODEC_ID_PCM_S32LE, CODEC_ID_PCM_S32BE },
         [AV_SAMPLE_FMT_FLT ] = { CODEC_ID_PCM_F32LE, CODEC_ID_PCM_F32BE },
         [AV_SAMPLE_FMT_DBL ] = { CODEC_ID_PCM_F64LE, CODEC_ID_PCM_F64BE },
         [AV_SAMPLE_FMT_U8P ] = { CODEC_ID_PCM_U8,    CODEC_ID_PCM_U8    },
         [AV_SAMPLE_FMT_S16P] = { CODEC_ID_PCM_S16LE, CODEC_ID_PCM_S16BE },
         [AV_SAMPLE_FMT_S32P] = { CODEC_ID_PCM_S32LE, CODEC_ID_PCM_S32BE },
         [AV_SAMPLE_FMT_FLTP] = { CODEC_ID_PCM_F32LE, CODEC_ID_PCM_F32BE },
         [AV_SAMPLE_FMT_DBLP] = { CODEC_ID_PCM_F64LE, CODEC_ID_PCM_F64BE },
     };
     if (fmt < 0 || fmt >= AV_SAMPLE_FMT_NB)
         return CODEC_ID_NONE;
     if (be < 0 || be > 1)
         be = AV_NE(1, 0);
     return map[fmt][be];

 }
 

 int av_get_bits_per_sample(enum CodecID codec_id)
 {
     switch (codec_id) {
     case CODEC_ID_ADPCM_SBPRO_2:
         return 2;
     case CODEC_ID_ADPCM_SBPRO_3:
         return 3;
     case CODEC_ID_ADPCM_SBPRO_4:
     case CODEC_ID_ADPCM_IMA_WAV:
     case CODEC_ID_ADPCM_IMA_QT:
     case CODEC_ID_ADPCM_SWF:
     case 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)
         return (frame_bytes * 8) / (bps * ch);
     bps = avctx->bits_per_coded_sample;
 
     /* codecs with a fixed packet duration */
     switch (id) {
     case CODEC_ID_ADPCM_ADX:    return   32;
     case CODEC_ID_ADPCM_IMA_QT: return   64;
     case CODEC_ID_ADPCM_EA_XAS: return  128;
     case CODEC_ID_AMR_NB:
     case CODEC_ID_GSM:
     case CODEC_ID_QCELP:
     case CODEC_ID_RA_144:
     case CODEC_ID_RA_288:       return  160;
     case CODEC_ID_IMC:          return  256;
     case CODEC_ID_AMR_WB:
     case CODEC_ID_GSM_MS:       return  320;
     case CODEC_ID_MP1:          return  384;
     case CODEC_ID_ATRAC1:       return  512;
     case CODEC_ID_ATRAC3:       return 1024;
     case CODEC_ID_MP2:
     case CODEC_ID_MUSEPACK7:    return 1152;
     case CODEC_ID_AC3:          return 1536;
     }
 
     if (sr > 0) {
         /* calc from sample rate */
         if (id == CODEC_ID_TTA)
             return 256 * sr / 245;
 
         if (ch > 0) {
             /* calc from sample rate and channels */
             if (id == CODEC_ID_BINKAUDIO_DCT)
                 return (480 << (sr / 22050)) / ch;
         }
     }
 
     if (ba > 0) {
         /* calc from block_align */
         if (id == CODEC_ID_SIPR) {
             switch (ba) {
             case 20: return 160;
             case 19: return 144;
             case 29: return 288;
             case 37: return 480;
             }
         }
     }
 
     if (frame_bytes > 0) {
         /* calc from frame_bytes only */
         if (id == CODEC_ID_TRUESPEECH)
             return 240 * (frame_bytes / 32);
         if (id == CODEC_ID_NELLYMOSER)
             return 256 * (frame_bytes / 64);
 
         if (bps > 0) {
             /* calc from frame_bytes and bits_per_coded_sample */
             if (id == CODEC_ID_ADPCM_G726)
                 return frame_bytes * 8 / bps;
         }
 
         if (ch > 0) {
             /* calc from frame_bytes and channels */
             switch (id) {
             case CODEC_ID_ADPCM_4XM:
             case CODEC_ID_ADPCM_IMA_ISS:
                 return (frame_bytes - 4 * ch) * 2 / ch;
             case CODEC_ID_ADPCM_IMA_SMJPEG:
                 return (frame_bytes - 4) * 2 / ch;
             case CODEC_ID_ADPCM_IMA_AMV:
                 return (frame_bytes - 8) * 2 / ch;
             case CODEC_ID_ADPCM_XA:
                 return (frame_bytes / 128) * 224 / ch;
             case CODEC_ID_INTERPLAY_DPCM:
                 return (frame_bytes - 6 - ch) / ch;
             case CODEC_ID_ROQ_DPCM:
                 return (frame_bytes - 8) / ch;
             case CODEC_ID_XAN_DPCM:
                 return (frame_bytes - 2 * ch) / ch;
             case CODEC_ID_MACE3:
                 return 3 * frame_bytes / ch;
             case CODEC_ID_MACE6:
                 return 6 * frame_bytes / ch;
             case CODEC_ID_PCM_LXF:
                 return 2 * (frame_bytes / (5 * ch));
             }
 
             if (tag) {
                 /* calc from frame_bytes, channels, and codec_tag */
                 if (id == 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 CODEC_ID_ADPCM_IMA_WAV:
                     return blocks * (1 + (ba - 4 * ch) / (4 * ch) * 8);
                 case CODEC_ID_ADPCM_IMA_DK3:

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

                 case CODEC_ID_ADPCM_IMA_DK4:
                     return blocks * (1 + (ba - 4 * ch) * 2 / ch);
                 case 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 CODEC_ID_PCM_DVD:
                     return 2 * (frame_bytes / ((bps * 2 / 8) * ch));
                 case CODEC_ID_PCM_BLURAY:
                     return frame_bytes / ((FFALIGN(ch, 2) * bps) / 8);
                 case 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;
 }
 

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

 {

     av_log(avc, AV_LOG_WARNING, "%s 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);

 }

 
 static AVHWAccel *first_hwaccel = NULL;
 
 void av_register_hwaccel(AVHWAccel *hwaccel)
 {
     AVHWAccel **p = &first_hwaccel;
     while (*p)
         p = &(*p)->next;
     *p = hwaccel;
     hwaccel->next = NULL;
 }

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

 
 AVHWAccel *ff_find_hwaccel(enum CodecID codec_id, enum PixelFormat 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 (ff_lockmgr_cb) {
         if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY))
             return -1;

         if (ff_lockmgr_cb(&avformat_mutex, AV_LOCK_DESTROY))
             return -1;

     }
 
     ff_lockmgr_cb = cb;
 
     if (ff_lockmgr_cb) {
         if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_CREATE))
             return -1;

         if (ff_lockmgr_cb(&avformat_mutex, AV_LOCK_CREATE))
             return -1;
     }
     return 0;
 }
 
 int avpriv_lock_avformat(void)
 {
     if (ff_lockmgr_cb) {
         if ((*ff_lockmgr_cb)(&avformat_mutex, AV_LOCK_OBTAIN))
             return -1;
     }
     return 0;
 }
 
 int avpriv_unlock_avformat(void)
 {
     if (ff_lockmgr_cb) {
         if ((*ff_lockmgr_cb)(&avformat_mutex, AV_LOCK_RELEASE))
             return -1;

     }
     return 0;
 }

 unsigned int avpriv_toupper4(unsigned int x)

 {
     return     toupper( x     &0xFF)
             + (toupper((x>>8 )&0xFF)<<8 )
             + (toupper((x>>16)&0xFF)<<16)
             + (toupper((x>>24)&0xFF)<<24);
 }

 #if !HAVE_THREADS

 
 int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
 {
     f->owner = avctx;

 
     ff_init_buffer_info(avctx, f);
 

     return avctx->get_buffer(avctx, f);
 }
 
 void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
 {
     f->owner->release_buffer(f->owner, f);
 }
 
 void ff_thread_finish_setup(AVCodecContext *avctx)
 {
 }
 
 void ff_thread_report_progress(AVFrame *f, int progress, int field)
 {
 }
 
 void ff_thread_await_progress(AVFrame *f, int progress, int field)
 {
 }
 

 int ff_thread_can_start_frame(AVCodecContext *avctx)
 {
     return 1;
 }
 

 #endif

 enum AVMediaType avcodec_get_type(enum CodecID codec_id)
 {

     AVCodec *c= avcodec_find_decoder(codec_id);
     if(!c)
         c= avcodec_find_encoder(codec_id);
     if(c)
         return c->type;
 

     if (codec_id <= CODEC_ID_NONE)
         return AVMEDIA_TYPE_UNKNOWN;
     else if (codec_id < CODEC_ID_FIRST_AUDIO)
         return AVMEDIA_TYPE_VIDEO;
     else if (codec_id < CODEC_ID_FIRST_SUBTITLE)
         return AVMEDIA_TYPE_AUDIO;
     else if (codec_id < CODEC_ID_FIRST_UNKNOWN)
         return AVMEDIA_TYPE_SUBTITLE;
 
     return AVMEDIA_TYPE_UNKNOWN;
 }

 
 int avcodec_is_open(AVCodecContext *s)
 {
     return !!s->internal;
 }