/*
  * 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/avstring.h"

 #include "libavutil/integer.h"
 #include "libavutil/crc.h"

 #include "libavutil/pixdesc.h"

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

 #include "libavutil/dict.h"

 #include "avcodec.h"

 #include "dsputil.h"

 #include "libavutil/opt.h"

 #include "imgconvert.h"

 #include "thread.h"

 #include "audioconvert.h"

 #include "internal.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;

 void *av_fast_realloc(void *ptr, unsigned int *size, FF_INTERNALC_MEM_TYPE 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;

 }
 

 void av_fast_malloc(void *ptr, unsigned int *size, FF_INTERNALC_MEM_TYPE min_size)

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

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

     av_free(*p);

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

 }
 

 /* encoder management */

 static AVCodec *first_avcodec = NULL;

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

 void avcodec_register(AVCodec *codec)

 {
     AVCodec **p;

     avcodec_init();

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

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

 }
 

 #if LIBAVCODEC_VERSION_MAJOR < 53

 void register_avcodec(AVCodec *codec)
 {
     avcodec_register(codec);
 }

 #endif

 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);
 }
 

 typedef struct InternalBuffer{

     int last_pic_num;

     uint8_t *base[4];

     uint8_t *data[4];

     int linesize[4];

     int width, height;
     enum PixelFormat pix_fmt;

 }InternalBuffer;
 

 #define INTERNAL_BUFFER_SIZE (32+1)

 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[4]){

     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_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_YUV420P9LE:
     case PIX_FMT_YUV420P9BE:
     case PIX_FMT_YUV420P10LE:
     case PIX_FMT_YUV420P10BE:

     case PIX_FMT_YUV422P10LE:
     case PIX_FMT_YUV422P10BE:

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

         w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
         h_align= 16;

         if(s->codec_id == CODEC_ID_MPEG2VIDEO || s->codec_id == CODEC_ID_MJPEG || s->codec_id == CODEC_ID_AMV || s->codec_id == CODEC_ID_THP || s->codec_id == CODEC_ID_H264)

             h_align= 32; // interlaced is rounded up to 2 MBs

         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;
     }
 

     *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

 
     linesize_align[0] =
     linesize_align[1] =
     linesize_align[2] =
     linesize_align[3] = STRIDE_ALIGN;
 //STRIDE_ALIGN is 8 for SSE* but this does not work for SVQ1 chroma planes
 //we could change STRIDE_ALIGN to 16 for x86/sse but it would increase the
 //picture size unneccessarily in some cases. The solution here is not
 //pretty and better ideas are welcome!
 #if HAVE_MMX
     if(s->codec_id == CODEC_ID_SVQ1 || s->codec_id == CODEC_ID_VP5 ||
        s->codec_id == CODEC_ID_VP6 || s->codec_id == CODEC_ID_VP6F ||
        s->codec_id == CODEC_ID_VP6A) {
         linesize_align[0] =
         linesize_align[1] =
         linesize_align[2] = 16;
     }
 #endif
 }
 
 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[4];
     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);

 }
 

 #if LIBAVCODEC_VERSION_MAJOR < 53

 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h){

     return av_image_check_size(w, h, 0, av_log_ctx);

 }

 #endif

 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){

     int i;

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

     InternalBuffer *buf;

     int *picture_number;

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

     if(av_image_check_size(w, h, 0, s))

         return -1;
 

     if(s->internal_buffer==NULL){

         s->internal_buffer= av_mallocz((INTERNAL_BUFFER_SIZE+1)*sizeof(InternalBuffer));

     }
 #if 0
     s->internal_buffer= av_fast_realloc(

         s->internal_buffer,
         &s->internal_buffer_size,

         sizeof(InternalBuffer)*FFMAX(99,  s->internal_buffer_count+1)/*FIXME*/
         );
 #endif

     buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];

     picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE]).last_pic_num; //FIXME ugly hack

     (*picture_number)++;

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

         if(s->active_thread_type&FF_THREAD_FRAME) {
             av_log_missing_feature(s, "Width/height changing with frame threads is", 0);
             return -1;
         }
 

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

     if(buf->base[0]){

         pic->age= *picture_number - buf->last_pic_num;
         buf->last_pic_num= *picture_number;

     }else{

         int h_chroma_shift, v_chroma_shift;

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

         int unaligned;

         AVPicture picture;

         int stride_align[4];

         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]);

         buf->last_pic_num= -256*256*256*64;

         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]);

         }

         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->age= 256*256*256*64;
     }

     pic->type= FF_BUFFER_TYPE_INTERNAL;

     for(i=0; i<4; i++){
         pic->base[i]= buf->base[i];
         pic->data[i]= buf->data[i];

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

     }
     s->internal_buffer_count++;
 

     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, s->internal_buffer_count);
 

     return 0;
 }
 

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

     int i;

     InternalBuffer *buf, *last;

     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);

     assert(s->internal_buffer_count);

     if(s->internal_buffer){

     buf = NULL; /* avoids warning */

     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
         buf= &((InternalBuffer*)s->internal_buffer)[i];
         if(buf->data[0] == pic->data[0])
             break;
     }
     assert(i < s->internal_buffer_count);
     s->internal_buffer_count--;
     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
 

     FFSWAP(InternalBuffer, *buf, *last);

     }

     for(i=0; i<4; 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, s->internal_buffer_count);

 }
 

 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
     AVFrame temp_pic;
     int i;
 
     /* 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);
     }
 
     /* If internal buffer type return the same buffer */

     if(pic->type == FF_BUFFER_TYPE_INTERNAL) {

         if(s->pkt) pic->pkt_pts= s->pkt->pts;
         else       pic->pkt_pts= AV_NOPTS_VALUE;

         pic->reordered_opaque= s->reordered_opaque;

         return 0;

     }

 
     /*
      * Not internal type and reget_buffer not overridden, emulate cr buffer
      */
     temp_pic = *pic;
     for(i = 0; i < 4; 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->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;
 }
 

 #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 (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;
     }

     if(avctx->codec || !codec) {
         ret = AVERROR(EINVAL);

         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) {

             *(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(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 (codec->decode)
         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 (HAVE_THREADS && !avctx->thread_opaque) {

         ret = ff_thread_init(avctx);

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

     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 (avctx->codec->encode) {

         int i;

         if (avctx->codec->sample_fmts) {

             if (avctx->sample_fmt == AV_SAMPLE_FMT_NONE)
                 avctx->sample_fmt = AV_SAMPLE_FMT_S16;

             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->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;

         }

     }

     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);
     avctx->codec= NULL;
     goto end;

 }
 

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

                          const short *samples)
 {

     if(buf_size < FF_MIN_BUFFER_SIZE && 0){

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

         return -1;
     }

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

         int ret = avctx->codec->encode(avctx, buf, buf_size, samples);

         avctx->frame_number++;
         return ret;
     }else
         return 0;

 }
 

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

                          const AVFrame *pict)

 {

     if(buf_size < FF_MIN_BUFFER_SIZE){

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

         return -1;
     }

     if(av_image_check_size(avctx->width, avctx->height, 0, avctx))

         return -1;

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

         int ret = avctx->codec->encode(avctx, buf, buf_size, pict);

         avctx->frame_number++;

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

         return ret;
     }else
         return 0;

 }
 

 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, 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;
 }
 

 #if FF_API_VIDEO_OLD
 int attribute_align_arg avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
                          int *got_picture_ptr,
                          const uint8_t *buf, int buf_size)
 {
     AVPacket avpkt;
     av_init_packet(&avpkt);
     avpkt.data = buf;
     avpkt.size = buf_size;
     // HACK for CorePNG to decode as normal PNG by default
     avpkt.flags = AV_PKT_FLAG_KEY;
 
     return avcodec_decode_video2(avctx, picture, got_picture_ptr, &avpkt);
 }
 #endif
 

 int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
                          int *got_picture_ptr,
                          AVPacket *avpkt)
 {

     int ret;

     *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)){

         avctx->pkt = avpkt;

         if (HAVE_PTHREADS && avctx->active_thread_type&FF_THREAD_FRAME)
              ret = ff_thread_decode_frame(avctx, picture, got_picture_ptr,
                                           avpkt);
         else {
             ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
                               avpkt);
             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;

         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_AUDIO_OLD

 int attribute_align_arg avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,

                          int *frame_size_ptr,

                          const uint8_t *buf, int buf_size)

 {

     AVPacket avpkt;
     av_init_packet(&avpkt);
     avpkt.data = buf;
     avpkt.size = buf_size;
 
     return avcodec_decode_audio3(avctx, samples, frame_size_ptr, &avpkt);
 }
 #endif
 
 int attribute_align_arg avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
                          int *frame_size_ptr,
                          AVPacket *avpkt)
 {

     int ret;
 

     avctx->pkt = avpkt;
 

     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){

         //FIXME remove the check below _after_ ensuring that all audio check that the available space is enough
         if(*frame_size_ptr < AVCODEC_MAX_AUDIO_FRAME_SIZE){
             av_log(avctx, AV_LOG_ERROR, "buffer smaller than AVCODEC_MAX_AUDIO_FRAME_SIZE\n");
             return -1;
         }
         if(*frame_size_ptr < FF_MIN_BUFFER_SIZE ||

         *frame_size_ptr < avctx->channels * avctx->frame_size * sizeof(int16_t)){

             av_log(avctx, AV_LOG_ERROR, "buffer %d too small\n", *frame_size_ptr);
             return -1;
         }
 

         ret = avctx->codec->decode(avctx, samples, frame_size_ptr, avpkt);

         avctx->frame_number++;

     }else{

         ret= 0;

         *frame_size_ptr=0;
     }

     return ret;
 }
 

 #if FF_API_SUBTITLE_OLD

 int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
                             int *got_sub_ptr,
                             const uint8_t *buf, int buf_size)
 {

     AVPacket avpkt;
     av_init_packet(&avpkt);
     avpkt.data = buf;
     avpkt.size = buf_size;
 
     return avcodec_decode_subtitle2(avctx, sub, got_sub_ptr, &avpkt);
 }
 #endif
 
 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 (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;

     if (avctx->codec && avctx->codec->priv_class)

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

     av_freep(&avctx->priv_data);

     if(avctx->codec && avctx->codec->encode)

         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;
 }
 
 AVCodec *avcodec_find_encoder(enum CodecID id)
 {

     AVCodec *p, *experimental=NULL;

     p = first_avcodec;
     while (p) {

         if (p->encode != NULL && 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 (p->encode != NULL && 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;
     while (p) {

         if (p->decode != NULL && 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 (p->decode != NULL && strcmp(name,p->name) == 0)
             return p;
         p = p->next;
     }
     return NULL;
 }
 

 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;
 }
 

 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_name;

     const char *profile = NULL;

     AVCodec *p;
     char buf1[32];

     int bitrate;

     AVRational display_aspect_ratio;

 
     if (encode)
         p = avcodec_find_encoder(enc->codec_id);
     else
         p = avcodec_find_decoder(enc->codec_id);
 
     if (p) {
         codec_name = p->name;

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

     } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
         /* fake mpeg2 transport stream codec (currently not
            registered) */
         codec_name = "mpeg2ts";

     } else if (enc->codec_name[0] != '\0') {
         codec_name = enc->codec_name;
     } else {
         /* output avi tags */

         char tag_buf[32];
         av_get_codec_tag_string(tag_buf, sizeof(tag_buf), enc->codec_tag);
         snprintf(buf1, sizeof(buf1), "%s / 0x%04X", tag_buf, enc->codec_tag);

         codec_name = buf1;
     }
 
     switch(enc->codec_type) {

     case AVMEDIA_TYPE_VIDEO:

         snprintf(buf, buf_size,
                  "Video: %s%s",

                  codec_name, enc->mb_decision ? " (hq)" : "");

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

         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),
                          " [PAR %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:

         snprintf(buf, buf_size,
                  "Audio: %s",
                  codec_name);

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

         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:

         snprintf(buf, buf_size, "Data: %s", codec_name);

         break;

     case AVMEDIA_TYPE_SUBTITLE:

         snprintf(buf, buf_size, "Subtitle: %s", codec_name);

         break;

     case AVMEDIA_TYPE_ATTACHMENT:

         snprintf(buf, buf_size, "Attachment: %s", codec_name);
         break;

     default:

         snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
         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 )
 {
   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_init(void)
 {

     static int initialized = 0;

     if (initialized != 0)

         return;

     initialized = 1;

     dsputil_static_init();

 }
 

 void avcodec_flush_buffers(AVCodecContext *avctx)
 {

     if(HAVE_PTHREADS && avctx->active_thread_type&FF_THREAD_FRAME)
         ff_thread_flush(avctx);

     else if(avctx->codec->flush)

         avctx->codec->flush(avctx);

 }
 

 void avcodec_default_free_buffers(AVCodecContext *s){

     int i, j;
 
     if(s->internal_buffer==NULL) return;

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

     for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
         InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
         for(j=0; j<4; j++){
             av_freep(&buf->base[j]);
             buf->data[j]= NULL;
         }
     }
     av_freep(&s->internal_buffer);

     s->internal_buffer_count=0;
 }
 

 #if FF_API_OLD_FF_PICT_TYPES

 char av_get_pict_type_char(int pict_type){

     return av_get_picture_type_char(pict_type);

 }

 #endif

 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_CT:

     case CODEC_ID_ADPCM_IMA_WAV:

     case CODEC_ID_ADPCM_MS:
     case CODEC_ID_ADPCM_YAMAHA:

         return 4;

     case CODEC_ID_ADPCM_G722:

     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;
     }
 }
 

 #if FF_API_OLD_SAMPLE_FMT

 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt) {

     return av_get_bytes_per_sample(sample_fmt) << 3;

 }

 #endif

 #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;
 }

 #if LIBAVCODEC_VERSION_MAJOR < 53

 #include "libavutil/parseutils.h"

 
 int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str)
 {

     return av_parse_video_size(width_ptr, height_ptr, str);

 }
 
 int av_parse_video_frame_rate(AVRational *frame_rate, const char *arg)
 {

     return av_parse_video_rate(frame_rate, arg);

 }

 #endif

 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;
     }
 
     ff_lockmgr_cb = cb;
 
     if (ff_lockmgr_cb) {
         if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_CREATE))
             return -1;
     }
     return 0;
 }

 
 unsigned int ff_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_PTHREADS
 
 int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
 {
     f->owner = avctx;
     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)
 {
 }
 
 #endif

 #if FF_API_THREAD_INIT

 int avcodec_thread_init(AVCodecContext *s, int thread_count)
 {

     s->thread_count = thread_count;
     return ff_thread_init(s);

 }
 
 void avcodec_thread_free(AVCodecContext *s)
 {

 #if HAVE_THREADS

     ff_thread_free(s);

 #endif

 }
 
 #endif