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libavcodec/utils.c

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00001 /*
00002  * utils for libavcodec
00003  * Copyright (c) 2001 Fabrice Bellard
00004  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
00005  *
00006  * This file is part of Libav.
00007  *
00008  * Libav is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * Libav is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with Libav; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00028 #include "libavutil/avassert.h"
00029 #include "libavutil/avstring.h"
00030 #include "libavutil/crc.h"
00031 #include "libavutil/mathematics.h"
00032 #include "libavutil/pixdesc.h"
00033 #include "libavutil/audioconvert.h"
00034 #include "libavutil/imgutils.h"
00035 #include "libavutil/samplefmt.h"
00036 #include "libavutil/dict.h"
00037 #include "avcodec.h"
00038 #include "dsputil.h"
00039 #include "libavutil/opt.h"
00040 #include "imgconvert.h"
00041 #include "thread.h"
00042 #include "audioconvert.h"
00043 #include "internal.h"
00044 #include "bytestream.h"
00045 #include <stdlib.h>
00046 #include <stdarg.h>
00047 #include <limits.h>
00048 #include <float.h>
00049 
00050 static int volatile entangled_thread_counter=0;
00051 static int (*ff_lockmgr_cb)(void **mutex, enum AVLockOp op);
00052 static void *codec_mutex;
00053 static void *avformat_mutex;
00054 
00055 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size)
00056 {
00057     if(min_size < *size)
00058         return ptr;
00059 
00060     min_size= FFMAX(17*min_size/16 + 32, min_size);
00061 
00062     ptr= av_realloc(ptr, min_size);
00063     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
00064         min_size= 0;
00065 
00066     *size= min_size;
00067 
00068     return ptr;
00069 }
00070 
00071 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
00072 {
00073     void **p = ptr;
00074     if (min_size < *size)
00075         return;
00076     min_size= FFMAX(17*min_size/16 + 32, min_size);
00077     av_free(*p);
00078     *p = av_malloc(min_size);
00079     if (!*p) min_size = 0;
00080     *size= min_size;
00081 }
00082 
00083 /* encoder management */
00084 static AVCodec *first_avcodec = NULL;
00085 
00086 AVCodec *av_codec_next(AVCodec *c){
00087     if(c) return c->next;
00088     else  return first_avcodec;
00089 }
00090 
00091 #if !FF_API_AVCODEC_INIT
00092 static
00093 #endif
00094 void avcodec_init(void)
00095 {
00096     static int initialized = 0;
00097 
00098     if (initialized != 0)
00099         return;
00100     initialized = 1;
00101 
00102     dsputil_static_init();
00103 }
00104 
00105 static av_always_inline int codec_is_encoder(AVCodec *codec)
00106 {
00107     return codec && (codec->encode || codec->encode2);
00108 }
00109 
00110 static av_always_inline int codec_is_decoder(AVCodec *codec)
00111 {
00112     return codec && codec->decode;
00113 }
00114 
00115 void avcodec_register(AVCodec *codec)
00116 {
00117     AVCodec **p;
00118     avcodec_init();
00119     p = &first_avcodec;
00120     while (*p != NULL) p = &(*p)->next;
00121     *p = codec;
00122     codec->next = NULL;
00123 
00124     if (codec->init_static_data)
00125         codec->init_static_data(codec);
00126 }
00127 
00128 unsigned avcodec_get_edge_width(void)
00129 {
00130     return EDGE_WIDTH;
00131 }
00132 
00133 void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
00134     s->coded_width = width;
00135     s->coded_height= height;
00136     s->width = -((-width )>>s->lowres);
00137     s->height= -((-height)>>s->lowres);
00138 }
00139 
00140 #define INTERNAL_BUFFER_SIZE (32+1)
00141 
00142 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
00143                                int linesize_align[AV_NUM_DATA_POINTERS])
00144 {
00145     int i;
00146     int w_align= 1;
00147     int h_align= 1;
00148 
00149     switch(s->pix_fmt){
00150     case PIX_FMT_YUV420P:
00151     case PIX_FMT_YUYV422:
00152     case PIX_FMT_UYVY422:
00153     case PIX_FMT_YUV422P:
00154     case PIX_FMT_YUV440P:
00155     case PIX_FMT_YUV444P:
00156     case PIX_FMT_GBRP:
00157     case PIX_FMT_GRAY8:
00158     case PIX_FMT_GRAY16BE:
00159     case PIX_FMT_GRAY16LE:
00160     case PIX_FMT_YUVJ420P:
00161     case PIX_FMT_YUVJ422P:
00162     case PIX_FMT_YUVJ440P:
00163     case PIX_FMT_YUVJ444P:
00164     case PIX_FMT_YUVA420P:
00165     case PIX_FMT_YUV420P9LE:
00166     case PIX_FMT_YUV420P9BE:
00167     case PIX_FMT_YUV420P10LE:
00168     case PIX_FMT_YUV420P10BE:
00169     case PIX_FMT_YUV422P9LE:
00170     case PIX_FMT_YUV422P9BE:
00171     case PIX_FMT_YUV422P10LE:
00172     case PIX_FMT_YUV422P10BE:
00173     case PIX_FMT_YUV444P9LE:
00174     case PIX_FMT_YUV444P9BE:
00175     case PIX_FMT_YUV444P10LE:
00176     case PIX_FMT_YUV444P10BE:
00177     case PIX_FMT_GBRP9LE:
00178     case PIX_FMT_GBRP9BE:
00179     case PIX_FMT_GBRP10LE:
00180     case PIX_FMT_GBRP10BE:
00181         w_align = 16; //FIXME assume 16 pixel per macroblock
00182         h_align = 16 * 2; // interlaced needs 2 macroblocks height
00183         break;
00184     case PIX_FMT_YUV411P:
00185     case PIX_FMT_UYYVYY411:
00186         w_align=32;
00187         h_align=8;
00188         break;
00189     case PIX_FMT_YUV410P:
00190         if(s->codec_id == CODEC_ID_SVQ1){
00191             w_align=64;
00192             h_align=64;
00193         }
00194     case PIX_FMT_RGB555:
00195         if(s->codec_id == CODEC_ID_RPZA){
00196             w_align=4;
00197             h_align=4;
00198         }
00199     case PIX_FMT_PAL8:
00200     case PIX_FMT_BGR8:
00201     case PIX_FMT_RGB8:
00202         if(s->codec_id == CODEC_ID_SMC){
00203             w_align=4;
00204             h_align=4;
00205         }
00206         break;
00207     case PIX_FMT_BGR24:
00208         if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){
00209             w_align=4;
00210             h_align=4;
00211         }
00212         break;
00213     default:
00214         w_align= 1;
00215         h_align= 1;
00216         break;
00217     }
00218 
00219     *width = FFALIGN(*width , w_align);
00220     *height= FFALIGN(*height, h_align);
00221     if(s->codec_id == CODEC_ID_H264 || s->lowres)
00222         *height+=2; // some of the optimized chroma MC reads one line too much
00223                     // which is also done in mpeg decoders with lowres > 0
00224 
00225     for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
00226         linesize_align[i] = STRIDE_ALIGN;
00227 //STRIDE_ALIGN is 8 for SSE* but this does not work for SVQ1 chroma planes
00228 //we could change STRIDE_ALIGN to 16 for x86/sse but it would increase the
00229 //picture size unneccessarily in some cases. The solution here is not
00230 //pretty and better ideas are welcome!
00231 #if HAVE_MMX
00232     if(s->codec_id == CODEC_ID_SVQ1 || s->codec_id == CODEC_ID_VP5 ||
00233        s->codec_id == CODEC_ID_VP6 || s->codec_id == CODEC_ID_VP6F ||
00234        s->codec_id == CODEC_ID_VP6A) {
00235         for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
00236             linesize_align[i] = 16;
00237     }
00238 #endif
00239 }
00240 
00241 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
00242     int chroma_shift = av_pix_fmt_descriptors[s->pix_fmt].log2_chroma_w;
00243     int linesize_align[AV_NUM_DATA_POINTERS];
00244     int align;
00245     avcodec_align_dimensions2(s, width, height, linesize_align);
00246     align = FFMAX(linesize_align[0], linesize_align[3]);
00247     linesize_align[1] <<= chroma_shift;
00248     linesize_align[2] <<= chroma_shift;
00249     align = FFMAX3(align, linesize_align[1], linesize_align[2]);
00250     *width=FFALIGN(*width, align);
00251 }
00252 
00253 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
00254                              enum AVSampleFormat sample_fmt, const uint8_t *buf,
00255                              int buf_size, int align)
00256 {
00257     int ch, planar, needed_size, ret = 0;
00258 
00259     needed_size = av_samples_get_buffer_size(NULL, nb_channels,
00260                                              frame->nb_samples, sample_fmt,
00261                                              align);
00262     if (buf_size < needed_size)
00263         return AVERROR(EINVAL);
00264 
00265     planar = av_sample_fmt_is_planar(sample_fmt);
00266     if (planar && nb_channels > AV_NUM_DATA_POINTERS) {
00267         if (!(frame->extended_data = av_mallocz(nb_channels *
00268                                                 sizeof(*frame->extended_data))))
00269             return AVERROR(ENOMEM);
00270     } else {
00271         frame->extended_data = frame->data;
00272     }
00273 
00274     if ((ret = av_samples_fill_arrays(frame->extended_data, &frame->linesize[0],
00275                                       buf, nb_channels, frame->nb_samples,
00276                                       sample_fmt, align)) < 0) {
00277         if (frame->extended_data != frame->data)
00278             av_free(frame->extended_data);
00279         return ret;
00280     }
00281     if (frame->extended_data != frame->data) {
00282         for (ch = 0; ch < AV_NUM_DATA_POINTERS; ch++)
00283             frame->data[ch] = frame->extended_data[ch];
00284     }
00285 
00286     return ret;
00287 }
00288 
00289 static int audio_get_buffer(AVCodecContext *avctx, AVFrame *frame)
00290 {
00291     AVCodecInternal *avci = avctx->internal;
00292     InternalBuffer *buf;
00293     int buf_size, ret;
00294 
00295     buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
00296                                           frame->nb_samples, avctx->sample_fmt,
00297                                           32);
00298     if (buf_size < 0)
00299         return AVERROR(EINVAL);
00300 
00301     /* allocate InternalBuffer if needed */
00302     if (!avci->buffer) {
00303         avci->buffer = av_mallocz(sizeof(InternalBuffer));
00304         if (!avci->buffer)
00305             return AVERROR(ENOMEM);
00306     }
00307     buf = avci->buffer;
00308 
00309     /* if there is a previously-used internal buffer, check its size and
00310        channel count to see if we can reuse it */
00311     if (buf->extended_data) {
00312         /* if current buffer is too small, free it */
00313         if (buf->extended_data[0] && buf_size > buf->audio_data_size) {
00314             av_free(buf->extended_data[0]);
00315             if (buf->extended_data != buf->data)
00316                 av_free(&buf->extended_data);
00317             buf->extended_data = NULL;
00318             buf->data[0] = NULL;
00319         }
00320         /* if number of channels has changed, reset and/or free extended data
00321            pointers but leave data buffer in buf->data[0] for reuse */
00322         if (buf->nb_channels != avctx->channels) {
00323             if (buf->extended_data != buf->data)
00324                 av_free(buf->extended_data);
00325             buf->extended_data = NULL;
00326         }
00327     }
00328 
00329     /* if there is no previous buffer or the previous buffer cannot be used
00330        as-is, allocate a new buffer and/or rearrange the channel pointers */
00331     if (!buf->extended_data) {
00332         if (!buf->data[0]) {
00333             if (!(buf->data[0] = av_mallocz(buf_size)))
00334                 return AVERROR(ENOMEM);
00335             buf->audio_data_size = buf_size;
00336         }
00337         if ((ret = avcodec_fill_audio_frame(frame, avctx->channels,
00338                                             avctx->sample_fmt, buf->data[0],
00339                                             buf->audio_data_size, 32)))
00340             return ret;
00341 
00342         if (frame->extended_data == frame->data)
00343             buf->extended_data = buf->data;
00344         else
00345             buf->extended_data = frame->extended_data;
00346         memcpy(buf->data, frame->data, sizeof(frame->data));
00347         buf->linesize[0] = frame->linesize[0];
00348         buf->nb_channels = avctx->channels;
00349     } else {
00350         /* copy InternalBuffer info to the AVFrame */
00351         frame->extended_data = buf->extended_data;
00352         frame->linesize[0]   = buf->linesize[0];
00353         memcpy(frame->data, buf->data, sizeof(frame->data));
00354     }
00355 
00356     frame->type          = FF_BUFFER_TYPE_INTERNAL;
00357 
00358     if (avctx->pkt) frame->pkt_pts = avctx->pkt->pts;
00359     else            frame->pkt_pts = AV_NOPTS_VALUE;
00360     frame->reordered_opaque = avctx->reordered_opaque;
00361 
00362     if (avctx->debug & FF_DEBUG_BUFFERS)
00363         av_log(avctx, AV_LOG_DEBUG, "default_get_buffer called on frame %p, "
00364                "internal audio buffer used\n", frame);
00365 
00366     return 0;
00367 }
00368 
00369 static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
00370 {
00371     int i;
00372     int w= s->width;
00373     int h= s->height;
00374     InternalBuffer *buf;
00375     AVCodecInternal *avci = s->internal;
00376 
00377     if(pic->data[0]!=NULL) {
00378         av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");
00379         return -1;
00380     }
00381     if(avci->buffer_count >= INTERNAL_BUFFER_SIZE) {
00382         av_log(s, AV_LOG_ERROR, "buffer_count overflow (missing release_buffer?)\n");
00383         return -1;
00384     }
00385 
00386     if(av_image_check_size(w, h, 0, s))
00387         return -1;
00388 
00389     if (!avci->buffer) {
00390         avci->buffer = av_mallocz((INTERNAL_BUFFER_SIZE+1) *
00391                                   sizeof(InternalBuffer));
00392     }
00393 
00394     buf = &avci->buffer[avci->buffer_count];
00395 
00396     if(buf->base[0] && (buf->width != w || buf->height != h || buf->pix_fmt != s->pix_fmt)){
00397         if(s->active_thread_type&FF_THREAD_FRAME) {
00398             av_log_missing_feature(s, "Width/height changing with frame threads is", 0);
00399             return -1;
00400         }
00401 
00402         for (i = 0; i < AV_NUM_DATA_POINTERS; i++) {
00403             av_freep(&buf->base[i]);
00404             buf->data[i]= NULL;
00405         }
00406     }
00407 
00408     if (!buf->base[0]) {
00409         int h_chroma_shift, v_chroma_shift;
00410         int size[4] = {0};
00411         int tmpsize;
00412         int unaligned;
00413         AVPicture picture;
00414         int stride_align[AV_NUM_DATA_POINTERS];
00415         const int pixel_size = av_pix_fmt_descriptors[s->pix_fmt].comp[0].step_minus1+1;
00416 
00417         avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
00418 
00419         avcodec_align_dimensions2(s, &w, &h, stride_align);
00420 
00421         if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
00422             w+= EDGE_WIDTH*2;
00423             h+= EDGE_WIDTH*2;
00424         }
00425 
00426         do {
00427             // NOTE: do not align linesizes individually, this breaks e.g. assumptions
00428             // that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2
00429             av_image_fill_linesizes(picture.linesize, s->pix_fmt, w);
00430             // increase alignment of w for next try (rhs gives the lowest bit set in w)
00431             w += w & ~(w-1);
00432 
00433             unaligned = 0;
00434             for (i=0; i<4; i++){
00435                 unaligned |= picture.linesize[i] % stride_align[i];
00436             }
00437         } while (unaligned);
00438 
00439         tmpsize = av_image_fill_pointers(picture.data, s->pix_fmt, h, NULL, picture.linesize);
00440         if (tmpsize < 0)
00441             return -1;
00442 
00443         for (i=0; i<3 && picture.data[i+1]; i++)
00444             size[i] = picture.data[i+1] - picture.data[i];
00445         size[i] = tmpsize - (picture.data[i] - picture.data[0]);
00446 
00447         memset(buf->base, 0, sizeof(buf->base));
00448         memset(buf->data, 0, sizeof(buf->data));
00449 
00450         for(i=0; i<4 && size[i]; i++){
00451             const int h_shift= i==0 ? 0 : h_chroma_shift;
00452             const int v_shift= i==0 ? 0 : v_chroma_shift;
00453 
00454             buf->linesize[i]= picture.linesize[i];
00455 
00456             buf->base[i]= av_malloc(size[i]+16); //FIXME 16
00457             if(buf->base[i]==NULL) return -1;
00458             memset(buf->base[i], 128, size[i]);
00459 
00460             // no edge if EDGE EMU or not planar YUV
00461             if((s->flags&CODEC_FLAG_EMU_EDGE) || !size[2])
00462                 buf->data[i] = buf->base[i];
00463             else
00464                 buf->data[i] = buf->base[i] + FFALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (pixel_size*EDGE_WIDTH>>h_shift), stride_align[i]);
00465         }
00466         for (; i < AV_NUM_DATA_POINTERS; i++) {
00467             buf->base[i] = buf->data[i] = NULL;
00468             buf->linesize[i] = 0;
00469         }
00470         if(size[1] && !size[2])
00471             ff_set_systematic_pal2((uint32_t*)buf->data[1], s->pix_fmt);
00472         buf->width  = s->width;
00473         buf->height = s->height;
00474         buf->pix_fmt= s->pix_fmt;
00475     }
00476     pic->type= FF_BUFFER_TYPE_INTERNAL;
00477 
00478     for (i = 0; i < AV_NUM_DATA_POINTERS; i++) {
00479         pic->base[i]= buf->base[i];
00480         pic->data[i]= buf->data[i];
00481         pic->linesize[i]= buf->linesize[i];
00482     }
00483     pic->extended_data = pic->data;
00484     avci->buffer_count++;
00485 
00486     if(s->pkt) pic->pkt_pts= s->pkt->pts;
00487     else       pic->pkt_pts= AV_NOPTS_VALUE;
00488     pic->reordered_opaque= s->reordered_opaque;
00489 
00490     if(s->debug&FF_DEBUG_BUFFERS)
00491         av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p, %d "
00492                "buffers used\n", pic, avci->buffer_count);
00493 
00494     return 0;
00495 }
00496 
00497 int avcodec_default_get_buffer(AVCodecContext *avctx, AVFrame *frame)
00498 {
00499     switch (avctx->codec_type) {
00500     case AVMEDIA_TYPE_VIDEO:
00501         return video_get_buffer(avctx, frame);
00502     case AVMEDIA_TYPE_AUDIO:
00503         return audio_get_buffer(avctx, frame);
00504     default:
00505         return -1;
00506     }
00507 }
00508 
00509 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
00510     int i;
00511     InternalBuffer *buf, *last;
00512     AVCodecInternal *avci = s->internal;
00513 
00514     assert(s->codec_type == AVMEDIA_TYPE_VIDEO);
00515 
00516     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
00517     assert(avci->buffer_count);
00518 
00519     if (avci->buffer) {
00520         buf = NULL; /* avoids warning */
00521         for (i = 0; i < avci->buffer_count; i++) { //just 3-5 checks so is not worth to optimize
00522             buf = &avci->buffer[i];
00523             if (buf->data[0] == pic->data[0])
00524                 break;
00525         }
00526         assert(i < avci->buffer_count);
00527         avci->buffer_count--;
00528         last = &avci->buffer[avci->buffer_count];
00529 
00530         if (buf != last)
00531             FFSWAP(InternalBuffer, *buf, *last);
00532     }
00533 
00534     for (i = 0; i < AV_NUM_DATA_POINTERS; i++) {
00535         pic->data[i]=NULL;
00536 //        pic->base[i]=NULL;
00537     }
00538 //printf("R%X\n", pic->opaque);
00539 
00540     if(s->debug&FF_DEBUG_BUFFERS)
00541         av_log(s, AV_LOG_DEBUG, "default_release_buffer called on pic %p, %d "
00542                "buffers used\n", pic, avci->buffer_count);
00543 }
00544 
00545 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
00546     AVFrame temp_pic;
00547     int i;
00548 
00549     assert(s->codec_type == AVMEDIA_TYPE_VIDEO);
00550 
00551     /* If no picture return a new buffer */
00552     if(pic->data[0] == NULL) {
00553         /* We will copy from buffer, so must be readable */
00554         pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
00555         return s->get_buffer(s, pic);
00556     }
00557 
00558     /* If internal buffer type return the same buffer */
00559     if(pic->type == FF_BUFFER_TYPE_INTERNAL) {
00560         if(s->pkt) pic->pkt_pts= s->pkt->pts;
00561         else       pic->pkt_pts= AV_NOPTS_VALUE;
00562         pic->reordered_opaque= s->reordered_opaque;
00563         return 0;
00564     }
00565 
00566     /*
00567      * Not internal type and reget_buffer not overridden, emulate cr buffer
00568      */
00569     temp_pic = *pic;
00570     for(i = 0; i < AV_NUM_DATA_POINTERS; i++)
00571         pic->data[i] = pic->base[i] = NULL;
00572     pic->opaque = NULL;
00573     /* Allocate new frame */
00574     if (s->get_buffer(s, pic))
00575         return -1;
00576     /* Copy image data from old buffer to new buffer */
00577     av_picture_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
00578              s->height);
00579     s->release_buffer(s, &temp_pic); // Release old frame
00580     return 0;
00581 }
00582 
00583 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
00584     int i;
00585 
00586     for(i=0; i<count; i++){
00587         int r= func(c, (char*)arg + i*size);
00588         if(ret) ret[i]= r;
00589     }
00590     return 0;
00591 }
00592 
00593 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr),void *arg, int *ret, int count){
00594     int i;
00595 
00596     for(i=0; i<count; i++){
00597         int r= func(c, arg, i, 0);
00598         if(ret) ret[i]= r;
00599     }
00600     return 0;
00601 }
00602 
00603 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat *fmt){
00604     while (*fmt != PIX_FMT_NONE && ff_is_hwaccel_pix_fmt(*fmt))
00605         ++fmt;
00606     return fmt[0];
00607 }
00608 
00609 void avcodec_get_frame_defaults(AVFrame *pic){
00610     memset(pic, 0, sizeof(AVFrame));
00611 
00612     pic->pts= AV_NOPTS_VALUE;
00613     pic->key_frame= 1;
00614     pic->sample_aspect_ratio = (AVRational){0, 1};
00615     pic->format = -1;           /* unknown */
00616 }
00617 
00618 AVFrame *avcodec_alloc_frame(void){
00619     AVFrame *pic= av_malloc(sizeof(AVFrame));
00620 
00621     if(pic==NULL) return NULL;
00622 
00623     avcodec_get_frame_defaults(pic);
00624 
00625     return pic;
00626 }
00627 
00628 #if FF_API_AVCODEC_OPEN
00629 int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
00630 {
00631     return avcodec_open2(avctx, codec, NULL);
00632 }
00633 #endif
00634 
00635 int attribute_align_arg avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options)
00636 {
00637     int ret = 0;
00638     AVDictionary *tmp = NULL;
00639 
00640     if (avcodec_is_open(avctx))
00641         return 0;
00642 
00643     if ((!codec && !avctx->codec)) {
00644         av_log(avctx, AV_LOG_ERROR, "No codec provided to avcodec_open2().\n");
00645         return AVERROR(EINVAL);
00646     }
00647     if ((codec && avctx->codec && codec != avctx->codec)) {
00648         av_log(avctx, AV_LOG_ERROR, "This AVCodecContext was allocated for %s, "
00649                "but %s passed to avcodec_open2().\n", avctx->codec->name, codec->name);
00650         return AVERROR(EINVAL);
00651     }
00652     if (!codec)
00653         codec = avctx->codec;
00654 
00655     if (avctx->extradata_size < 0 || avctx->extradata_size >= FF_MAX_EXTRADATA_SIZE)
00656         return AVERROR(EINVAL);
00657 
00658     if (options)
00659         av_dict_copy(&tmp, *options, 0);
00660 
00661     /* If there is a user-supplied mutex locking routine, call it. */
00662     if (ff_lockmgr_cb) {
00663         if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
00664             return -1;
00665     }
00666 
00667     entangled_thread_counter++;
00668     if(entangled_thread_counter != 1){
00669         av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
00670         ret = -1;
00671         goto end;
00672     }
00673 
00674     avctx->internal = av_mallocz(sizeof(AVCodecInternal));
00675     if (!avctx->internal) {
00676         ret = AVERROR(ENOMEM);
00677         goto end;
00678     }
00679 
00680     if (codec->priv_data_size > 0) {
00681       if(!avctx->priv_data){
00682         avctx->priv_data = av_mallocz(codec->priv_data_size);
00683         if (!avctx->priv_data) {
00684             ret = AVERROR(ENOMEM);
00685             goto end;
00686         }
00687         if (codec->priv_class) {
00688             *(AVClass**)avctx->priv_data= codec->priv_class;
00689             av_opt_set_defaults(avctx->priv_data);
00690         }
00691       }
00692       if (codec->priv_class && (ret = av_opt_set_dict(avctx->priv_data, &tmp)) < 0)
00693           goto free_and_end;
00694     } else {
00695         avctx->priv_data = NULL;
00696     }
00697     if ((ret = av_opt_set_dict(avctx, &tmp)) < 0)
00698         goto free_and_end;
00699 
00700     if(avctx->coded_width && avctx->coded_height)
00701         avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
00702     else if(avctx->width && avctx->height)
00703         avcodec_set_dimensions(avctx, avctx->width, avctx->height);
00704 
00705     if ((avctx->coded_width || avctx->coded_height || avctx->width || avctx->height)
00706         && (  av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx) < 0
00707            || av_image_check_size(avctx->width,       avctx->height,       0, avctx) < 0)) {
00708         av_log(avctx, AV_LOG_WARNING, "ignoring invalid width/height values\n");
00709         avcodec_set_dimensions(avctx, 0, 0);
00710     }
00711 
00712     /* if the decoder init function was already called previously,
00713        free the already allocated subtitle_header before overwriting it */
00714     if (codec_is_decoder(codec))
00715         av_freep(&avctx->subtitle_header);
00716 
00717 #define SANE_NB_CHANNELS 128U
00718     if (avctx->channels > SANE_NB_CHANNELS) {
00719         ret = AVERROR(EINVAL);
00720         goto free_and_end;
00721     }
00722 
00723     avctx->codec = codec;
00724     if ((avctx->codec_type == AVMEDIA_TYPE_UNKNOWN || avctx->codec_type == codec->type) &&
00725         avctx->codec_id == CODEC_ID_NONE) {
00726         avctx->codec_type = codec->type;
00727         avctx->codec_id   = codec->id;
00728     }
00729     if (avctx->codec_id != codec->id || (avctx->codec_type != codec->type
00730                            && avctx->codec_type != AVMEDIA_TYPE_ATTACHMENT)) {
00731         av_log(avctx, AV_LOG_ERROR, "codec type or id mismatches\n");
00732         ret = AVERROR(EINVAL);
00733         goto free_and_end;
00734     }
00735     avctx->frame_number = 0;
00736 #if FF_API_ER
00737 
00738     av_log(avctx, AV_LOG_DEBUG, "err{or,}_recognition separate: %d; %d\n",
00739            avctx->error_recognition, avctx->err_recognition);
00740     /* FF_ER_CAREFUL (==1) implies AV_EF_CRCCHECK (== 1<<1 - 1),
00741        FF_ER_COMPLIANT (==2) implies AV_EF_{CRCCHECK,BITSTREAM} (== 1<<2 - 1), et cetera} */
00742     avctx->err_recognition |= (1<<(avctx->error_recognition-(avctx->error_recognition>=FF_ER_VERY_AGGRESSIVE))) - 1;
00743     av_log(avctx, AV_LOG_DEBUG, "err{or,}_recognition combined: %d; %d\n",
00744            avctx->error_recognition, avctx->err_recognition);
00745 #endif
00746 
00747     if (avctx->codec_type == AVMEDIA_TYPE_AUDIO &&
00748         (!avctx->time_base.num || !avctx->time_base.den)) {
00749         avctx->time_base.num = 1;
00750         avctx->time_base.den = avctx->sample_rate;
00751     }
00752 
00753     if (HAVE_THREADS && !avctx->thread_opaque) {
00754         ret = ff_thread_init(avctx);
00755         if (ret < 0) {
00756             goto free_and_end;
00757         }
00758     }
00759     if (!HAVE_THREADS && !(codec->capabilities & CODEC_CAP_AUTO_THREADS))
00760         avctx->thread_count = 1;
00761 
00762     if (avctx->codec->max_lowres < avctx->lowres) {
00763         av_log(avctx, AV_LOG_ERROR, "The maximum value for lowres supported by the decoder is %d\n",
00764                avctx->codec->max_lowres);
00765         ret = AVERROR(EINVAL);
00766         goto free_and_end;
00767     }
00768     if (codec_is_encoder(avctx->codec)) {
00769         int i;
00770         if (avctx->codec->sample_fmts) {
00771             for (i = 0; avctx->codec->sample_fmts[i] != AV_SAMPLE_FMT_NONE; i++)
00772                 if (avctx->sample_fmt == avctx->codec->sample_fmts[i])
00773                     break;
00774             if (avctx->codec->sample_fmts[i] == AV_SAMPLE_FMT_NONE) {
00775                 av_log(avctx, AV_LOG_ERROR, "Specified sample_fmt is not supported.\n");
00776                 ret = AVERROR(EINVAL);
00777                 goto free_and_end;
00778             }
00779         }
00780         if (avctx->codec->supported_samplerates) {
00781             for (i = 0; avctx->codec->supported_samplerates[i] != 0; i++)
00782                 if (avctx->sample_rate == avctx->codec->supported_samplerates[i])
00783                     break;
00784             if (avctx->codec->supported_samplerates[i] == 0) {
00785                 av_log(avctx, AV_LOG_ERROR, "Specified sample_rate is not supported\n");
00786                 ret = AVERROR(EINVAL);
00787                 goto free_and_end;
00788             }
00789         }
00790         if (avctx->codec->channel_layouts) {
00791             if (!avctx->channel_layout) {
00792                 av_log(avctx, AV_LOG_WARNING, "channel_layout not specified\n");
00793             } else {
00794                 for (i = 0; avctx->codec->channel_layouts[i] != 0; i++)
00795                     if (avctx->channel_layout == avctx->codec->channel_layouts[i])
00796                         break;
00797                 if (avctx->codec->channel_layouts[i] == 0) {
00798                     av_log(avctx, AV_LOG_ERROR, "Specified channel_layout is not supported\n");
00799                     ret = AVERROR(EINVAL);
00800                     goto free_and_end;
00801                 }
00802             }
00803         }
00804         if (avctx->channel_layout && avctx->channels) {
00805             if (av_get_channel_layout_nb_channels(avctx->channel_layout) != avctx->channels) {
00806                 av_log(avctx, AV_LOG_ERROR, "channel layout does not match number of channels\n");
00807                 ret = AVERROR(EINVAL);
00808                 goto free_and_end;
00809             }
00810         } else if (avctx->channel_layout) {
00811             avctx->channels = av_get_channel_layout_nb_channels(avctx->channel_layout);
00812         }
00813     }
00814 
00815     if(avctx->codec->init && !(avctx->active_thread_type&FF_THREAD_FRAME)){
00816         ret = avctx->codec->init(avctx);
00817         if (ret < 0) {
00818             goto free_and_end;
00819         }
00820     }
00821 end:
00822     entangled_thread_counter--;
00823 
00824     /* Release any user-supplied mutex. */
00825     if (ff_lockmgr_cb) {
00826         (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
00827     }
00828     if (options) {
00829         av_dict_free(options);
00830         *options = tmp;
00831     }
00832 
00833     return ret;
00834 free_and_end:
00835     av_dict_free(&tmp);
00836     av_freep(&avctx->priv_data);
00837     av_freep(&avctx->internal);
00838     avctx->codec= NULL;
00839     goto end;
00840 }
00841 
00842 int ff_alloc_packet(AVPacket *avpkt, int size)
00843 {
00844     if (size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
00845         return AVERROR(EINVAL);
00846 
00847     if (avpkt->data) {
00848         uint8_t *pkt_data;
00849         int pkt_size;
00850 
00851         if (avpkt->size < size)
00852             return AVERROR(EINVAL);
00853 
00854         pkt_data = avpkt->data;
00855         pkt_size = avpkt->size;
00856         av_init_packet(avpkt);
00857         avpkt->data = pkt_data;
00858         avpkt->size = pkt_size;
00859         return 0;
00860     } else {
00861         return av_new_packet(avpkt, size);
00862     }
00863 }
00864 
00865 int attribute_align_arg avcodec_encode_audio2(AVCodecContext *avctx,
00866                                               AVPacket *avpkt,
00867                                               const AVFrame *frame,
00868                                               int *got_packet_ptr)
00869 {
00870     int ret;
00871     int user_packet = !!avpkt->data;
00872     int nb_samples;
00873 
00874     if (!(avctx->codec->capabilities & CODEC_CAP_DELAY) && !frame) {
00875         av_init_packet(avpkt);
00876         avpkt->size = 0;
00877         return 0;
00878     }
00879 
00880     /* check for valid frame size */
00881     if (frame) {
00882         nb_samples = frame->nb_samples;
00883         if (avctx->codec->capabilities & CODEC_CAP_SMALL_LAST_FRAME) {
00884             if (nb_samples > avctx->frame_size)
00885                 return AVERROR(EINVAL);
00886         } else if (!(avctx->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)) {
00887             if (nb_samples != avctx->frame_size)
00888                 return AVERROR(EINVAL);
00889         }
00890     } else {
00891         nb_samples = avctx->frame_size;
00892     }
00893 
00894     if (avctx->codec->encode2) {
00895         *got_packet_ptr = 0;
00896         ret = avctx->codec->encode2(avctx, avpkt, frame, got_packet_ptr);
00897         if (!ret && *got_packet_ptr &&
00898             !(avctx->codec->capabilities & CODEC_CAP_DELAY)) {
00899             avpkt->pts = frame->pts;
00900             avpkt->duration = av_rescale_q(frame->nb_samples,
00901                                            (AVRational){ 1, avctx->sample_rate },
00902                                            avctx->time_base);
00903         }
00904     } else {
00905         /* for compatibility with encoders not supporting encode2(), we need to
00906            allocate a packet buffer if the user has not provided one or check
00907            the size otherwise */
00908         int fs_tmp   = 0;
00909         int buf_size = avpkt->size;
00910         if (!user_packet) {
00911             if (avctx->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE) {
00912                 av_assert0(av_get_bits_per_sample(avctx->codec_id) != 0);
00913                 buf_size = nb_samples * avctx->channels *
00914                            av_get_bits_per_sample(avctx->codec_id) / 8;
00915             } else {
00916                 /* this is a guess as to the required size.
00917                    if an encoder needs more than this, it should probably
00918                    implement encode2() */
00919                 buf_size = 2 * avctx->frame_size * avctx->channels *
00920                            av_get_bytes_per_sample(avctx->sample_fmt);
00921                 buf_size += FF_MIN_BUFFER_SIZE;
00922             }
00923         }
00924         if ((ret = ff_alloc_packet(avpkt, buf_size)))
00925             return ret;
00926 
00927         /* Encoders using AVCodec.encode() that support
00928            CODEC_CAP_SMALL_LAST_FRAME require avctx->frame_size to be set to
00929            the smaller size when encoding the last frame.
00930            This code can be removed once all encoders supporting
00931            CODEC_CAP_SMALL_LAST_FRAME use encode2() */
00932         if ((avctx->codec->capabilities & CODEC_CAP_SMALL_LAST_FRAME) &&
00933             nb_samples < avctx->frame_size) {
00934             fs_tmp = avctx->frame_size;
00935             avctx->frame_size = nb_samples;
00936         }
00937 
00938         /* encode the frame */
00939         ret = avctx->codec->encode(avctx, avpkt->data, avpkt->size,
00940                                    frame ? frame->data[0] : NULL);
00941         if (ret >= 0) {
00942             if (!ret) {
00943                 /* no output. if the packet data was allocated by libavcodec,
00944                    free it */
00945                 if (!user_packet)
00946                     av_freep(&avpkt->data);
00947             } else {
00948                 if (avctx->coded_frame)
00949                     avpkt->pts = avctx->coded_frame->pts;
00950                 /* Set duration for final small packet. This can be removed
00951                    once all encoders supporting CODEC_CAP_SMALL_LAST_FRAME use
00952                    encode2() */
00953                 if (fs_tmp) {
00954                     avpkt->duration = av_rescale_q(avctx->frame_size,
00955                                                    (AVRational){ 1, avctx->sample_rate },
00956                                                    avctx->time_base);
00957                 }
00958             }
00959             avpkt->size = ret;
00960             *got_packet_ptr = (ret > 0);
00961             ret = 0;
00962         }
00963 
00964         if (fs_tmp)
00965             avctx->frame_size = fs_tmp;
00966     }
00967     if (!ret)
00968         avctx->frame_number++;
00969 
00970     /* NOTE: if we add any audio encoders which output non-keyframe packets,
00971              this needs to be moved to the encoders, but for now we can do it
00972              here to simplify things */
00973     avpkt->flags |= AV_PKT_FLAG_KEY;
00974 
00975     return ret;
00976 }
00977 
00978 #if FF_API_OLD_DECODE_AUDIO
00979 int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx,
00980                                              uint8_t *buf, int buf_size,
00981                                              const short *samples)
00982 {
00983     AVPacket pkt;
00984     AVFrame frame0;
00985     AVFrame *frame;
00986     int ret, samples_size, got_packet;
00987 
00988     av_init_packet(&pkt);
00989     pkt.data = buf;
00990     pkt.size = buf_size;
00991 
00992     if (samples) {
00993         frame = &frame0;
00994         avcodec_get_frame_defaults(frame);
00995 
00996         if (avctx->frame_size) {
00997             frame->nb_samples = avctx->frame_size;
00998         } else {
00999             /* if frame_size is not set, the number of samples must be
01000                calculated from the buffer size */
01001             int64_t nb_samples;
01002             if (!av_get_bits_per_sample(avctx->codec_id)) {
01003                 av_log(avctx, AV_LOG_ERROR, "avcodec_encode_audio() does not "
01004                        "support this codec\n");
01005                 return AVERROR(EINVAL);
01006             }
01007             nb_samples = (int64_t)buf_size * 8 /
01008                          (av_get_bits_per_sample(avctx->codec_id) *
01009                          avctx->channels);
01010             if (nb_samples >= INT_MAX)
01011                 return AVERROR(EINVAL);
01012             frame->nb_samples = nb_samples;
01013         }
01014 
01015         /* it is assumed that the samples buffer is large enough based on the
01016            relevant parameters */
01017         samples_size = av_samples_get_buffer_size(NULL, avctx->channels,
01018                                                   frame->nb_samples,
01019                                                   avctx->sample_fmt, 1);
01020         if ((ret = avcodec_fill_audio_frame(frame, avctx->channels,
01021                                             avctx->sample_fmt,
01022                                             samples, samples_size, 1)))
01023             return ret;
01024 
01025         /* fabricate frame pts from sample count.
01026            this is needed because the avcodec_encode_audio() API does not have
01027            a way for the user to provide pts */
01028         frame->pts = av_rescale_q(avctx->internal->sample_count,
01029                                   (AVRational){ 1, avctx->sample_rate },
01030                                   avctx->time_base);
01031         avctx->internal->sample_count += frame->nb_samples;
01032     } else {
01033         frame = NULL;
01034     }
01035 
01036     got_packet = 0;
01037     ret = avcodec_encode_audio2(avctx, &pkt, frame, &got_packet);
01038     if (!ret && got_packet && avctx->coded_frame) {
01039         avctx->coded_frame->pts       = pkt.pts;
01040         avctx->coded_frame->key_frame = !!(pkt.flags & AV_PKT_FLAG_KEY);
01041     }
01042     /* free any side data since we cannot return it */
01043     if (pkt.side_data_elems > 0) {
01044         int i;
01045         for (i = 0; i < pkt.side_data_elems; i++)
01046             av_free(pkt.side_data[i].data);
01047         av_freep(&pkt.side_data);
01048         pkt.side_data_elems = 0;
01049     }
01050 
01051     if (frame && frame->extended_data != frame->data)
01052         av_free(frame->extended_data);
01053 
01054     return ret ? ret : pkt.size;
01055 }
01056 #endif
01057 
01058 int attribute_align_arg avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
01059                          const AVFrame *pict)
01060 {
01061     if(buf_size < FF_MIN_BUFFER_SIZE){
01062         av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
01063         return -1;
01064     }
01065     if(av_image_check_size(avctx->width, avctx->height, 0, avctx))
01066         return -1;
01067     if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
01068         int ret = avctx->codec->encode(avctx, buf, buf_size, pict);
01069         avctx->frame_number++;
01070         emms_c(); //needed to avoid an emms_c() call before every return;
01071 
01072         return ret;
01073     }else
01074         return 0;
01075 }
01076 
01077 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
01078                             const AVSubtitle *sub)
01079 {
01080     int ret;
01081     if(sub->start_display_time) {
01082         av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
01083         return -1;
01084     }
01085     if(sub->num_rects == 0 || !sub->rects)
01086         return -1;
01087     ret = avctx->codec->encode(avctx, buf, buf_size, sub);
01088     avctx->frame_number++;
01089     return ret;
01090 }
01091 
01092 static void apply_param_change(AVCodecContext *avctx, AVPacket *avpkt)
01093 {
01094     int size = 0;
01095     const uint8_t *data;
01096     uint32_t flags;
01097 
01098     if (!(avctx->codec->capabilities & CODEC_CAP_PARAM_CHANGE))
01099         return;
01100 
01101     data = av_packet_get_side_data(avpkt, AV_PKT_DATA_PARAM_CHANGE, &size);
01102     if (!data || size < 4)
01103         return;
01104     flags = bytestream_get_le32(&data);
01105     size -= 4;
01106     if (size < 4) /* Required for any of the changes */
01107         return;
01108     if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {
01109         avctx->channels = bytestream_get_le32(&data);
01110         size -= 4;
01111     }
01112     if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) {
01113         if (size < 8)
01114             return;
01115         avctx->channel_layout = bytestream_get_le64(&data);
01116         size -= 8;
01117     }
01118     if (size < 4)
01119         return;
01120     if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {
01121         avctx->sample_rate = bytestream_get_le32(&data);
01122         size -= 4;
01123     }
01124     if (flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) {
01125         if (size < 8)
01126             return;
01127         avctx->width  = bytestream_get_le32(&data);
01128         avctx->height = bytestream_get_le32(&data);
01129         avcodec_set_dimensions(avctx, avctx->width, avctx->height);
01130         size -= 8;
01131     }
01132 }
01133 
01134 int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
01135                          int *got_picture_ptr,
01136                          AVPacket *avpkt)
01137 {
01138     int ret;
01139 
01140     *got_picture_ptr= 0;
01141     if((avctx->coded_width||avctx->coded_height) && av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx))
01142         return -1;
01143 
01144     avctx->pkt = avpkt;
01145     apply_param_change(avctx, avpkt);
01146 
01147     if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size || (avctx->active_thread_type&FF_THREAD_FRAME)){
01148         if (HAVE_THREADS && avctx->active_thread_type&FF_THREAD_FRAME)
01149              ret = ff_thread_decode_frame(avctx, picture, got_picture_ptr,
01150                                           avpkt);
01151         else {
01152             ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
01153                               avpkt);
01154             picture->pkt_dts= avpkt->dts;
01155             picture->sample_aspect_ratio = avctx->sample_aspect_ratio;
01156             picture->width  = avctx->width;
01157             picture->height = avctx->height;
01158             picture->format = avctx->pix_fmt;
01159         }
01160 
01161         emms_c(); //needed to avoid an emms_c() call before every return;
01162 
01163         if (*got_picture_ptr)
01164             avctx->frame_number++;
01165     }else
01166         ret= 0;
01167 
01168     return ret;
01169 }
01170 
01171 #if FF_API_OLD_DECODE_AUDIO
01172 int attribute_align_arg avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
01173                          int *frame_size_ptr,
01174                          AVPacket *avpkt)
01175 {
01176     AVFrame frame;
01177     int ret, got_frame = 0;
01178 
01179     if (avctx->get_buffer != avcodec_default_get_buffer) {
01180         av_log(avctx, AV_LOG_ERROR, "Custom get_buffer() for use with"
01181                "avcodec_decode_audio3() detected. Overriding with avcodec_default_get_buffer\n");
01182         av_log(avctx, AV_LOG_ERROR, "Please port your application to "
01183                "avcodec_decode_audio4()\n");
01184         avctx->get_buffer = avcodec_default_get_buffer;
01185     }
01186 
01187     ret = avcodec_decode_audio4(avctx, &frame, &got_frame, avpkt);
01188 
01189     if (ret >= 0 && got_frame) {
01190         int ch, plane_size;
01191         int planar = av_sample_fmt_is_planar(avctx->sample_fmt);
01192         int data_size = av_samples_get_buffer_size(&plane_size, avctx->channels,
01193                                                    frame.nb_samples,
01194                                                    avctx->sample_fmt, 1);
01195         if (*frame_size_ptr < data_size) {
01196             av_log(avctx, AV_LOG_ERROR, "output buffer size is too small for "
01197                    "the current frame (%d < %d)\n", *frame_size_ptr, data_size);
01198             return AVERROR(EINVAL);
01199         }
01200 
01201         memcpy(samples, frame.extended_data[0], plane_size);
01202 
01203         if (planar && avctx->channels > 1) {
01204             uint8_t *out = ((uint8_t *)samples) + plane_size;
01205             for (ch = 1; ch < avctx->channels; ch++) {
01206                 memcpy(out, frame.extended_data[ch], plane_size);
01207                 out += plane_size;
01208             }
01209         }
01210         *frame_size_ptr = data_size;
01211     } else {
01212         *frame_size_ptr = 0;
01213     }
01214     return ret;
01215 }
01216 #endif
01217 
01218 int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
01219                                               AVFrame *frame,
01220                                               int *got_frame_ptr,
01221                                               AVPacket *avpkt)
01222 {
01223     int ret = 0;
01224 
01225     *got_frame_ptr = 0;
01226 
01227     avctx->pkt = avpkt;
01228 
01229     if (!avpkt->data && avpkt->size) {
01230         av_log(avctx, AV_LOG_ERROR, "invalid packet: NULL data, size != 0\n");
01231         return AVERROR(EINVAL);
01232     }
01233 
01234     apply_param_change(avctx, avpkt);
01235 
01236     if ((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size) {
01237         ret = avctx->codec->decode(avctx, frame, got_frame_ptr, avpkt);
01238         if (ret >= 0 && *got_frame_ptr) {
01239             avctx->frame_number++;
01240             frame->pkt_dts = avpkt->dts;
01241             if (frame->format == AV_SAMPLE_FMT_NONE)
01242                 frame->format = avctx->sample_fmt;
01243         }
01244     }
01245     return ret;
01246 }
01247 
01248 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
01249                             int *got_sub_ptr,
01250                             AVPacket *avpkt)
01251 {
01252     int ret;
01253 
01254     avctx->pkt = avpkt;
01255     *got_sub_ptr = 0;
01256     ret = avctx->codec->decode(avctx, sub, got_sub_ptr, avpkt);
01257     if (*got_sub_ptr)
01258         avctx->frame_number++;
01259     return ret;
01260 }
01261 
01262 void avsubtitle_free(AVSubtitle *sub)
01263 {
01264     int i;
01265 
01266     for (i = 0; i < sub->num_rects; i++)
01267     {
01268         av_freep(&sub->rects[i]->pict.data[0]);
01269         av_freep(&sub->rects[i]->pict.data[1]);
01270         av_freep(&sub->rects[i]->pict.data[2]);
01271         av_freep(&sub->rects[i]->pict.data[3]);
01272         av_freep(&sub->rects[i]->text);
01273         av_freep(&sub->rects[i]->ass);
01274         av_freep(&sub->rects[i]);
01275     }
01276 
01277     av_freep(&sub->rects);
01278 
01279     memset(sub, 0, sizeof(AVSubtitle));
01280 }
01281 
01282 av_cold int avcodec_close(AVCodecContext *avctx)
01283 {
01284     /* If there is a user-supplied mutex locking routine, call it. */
01285     if (ff_lockmgr_cb) {
01286         if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
01287             return -1;
01288     }
01289 
01290     entangled_thread_counter++;
01291     if(entangled_thread_counter != 1){
01292         av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
01293         entangled_thread_counter--;
01294         return -1;
01295     }
01296 
01297     if (avcodec_is_open(avctx)) {
01298         if (HAVE_THREADS && avctx->thread_opaque)
01299             ff_thread_free(avctx);
01300         if (avctx->codec && avctx->codec->close)
01301             avctx->codec->close(avctx);
01302         avcodec_default_free_buffers(avctx);
01303         avctx->coded_frame = NULL;
01304         av_freep(&avctx->internal);
01305     }
01306 
01307     if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
01308         av_opt_free(avctx->priv_data);
01309     av_opt_free(avctx);
01310     av_freep(&avctx->priv_data);
01311     if (codec_is_encoder(avctx->codec))
01312         av_freep(&avctx->extradata);
01313     avctx->codec = NULL;
01314     avctx->active_thread_type = 0;
01315     entangled_thread_counter--;
01316 
01317     /* Release any user-supplied mutex. */
01318     if (ff_lockmgr_cb) {
01319         (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
01320     }
01321     return 0;
01322 }
01323 
01324 AVCodec *avcodec_find_encoder(enum CodecID id)
01325 {
01326     AVCodec *p, *experimental=NULL;
01327     p = first_avcodec;
01328     while (p) {
01329         if (codec_is_encoder(p) && p->id == id) {
01330             if (p->capabilities & CODEC_CAP_EXPERIMENTAL && !experimental) {
01331                 experimental = p;
01332             } else
01333                 return p;
01334         }
01335         p = p->next;
01336     }
01337     return experimental;
01338 }
01339 
01340 AVCodec *avcodec_find_encoder_by_name(const char *name)
01341 {
01342     AVCodec *p;
01343     if (!name)
01344         return NULL;
01345     p = first_avcodec;
01346     while (p) {
01347         if (codec_is_encoder(p) && strcmp(name,p->name) == 0)
01348             return p;
01349         p = p->next;
01350     }
01351     return NULL;
01352 }
01353 
01354 AVCodec *avcodec_find_decoder(enum CodecID id)
01355 {
01356     AVCodec *p;
01357     p = first_avcodec;
01358     while (p) {
01359         if (codec_is_decoder(p) && p->id == id)
01360             return p;
01361         p = p->next;
01362     }
01363     return NULL;
01364 }
01365 
01366 AVCodec *avcodec_find_decoder_by_name(const char *name)
01367 {
01368     AVCodec *p;
01369     if (!name)
01370         return NULL;
01371     p = first_avcodec;
01372     while (p) {
01373         if (codec_is_decoder(p) && strcmp(name,p->name) == 0)
01374             return p;
01375         p = p->next;
01376     }
01377     return NULL;
01378 }
01379 
01380 static int get_bit_rate(AVCodecContext *ctx)
01381 {
01382     int bit_rate;
01383     int bits_per_sample;
01384 
01385     switch(ctx->codec_type) {
01386     case AVMEDIA_TYPE_VIDEO:
01387     case AVMEDIA_TYPE_DATA:
01388     case AVMEDIA_TYPE_SUBTITLE:
01389     case AVMEDIA_TYPE_ATTACHMENT:
01390         bit_rate = ctx->bit_rate;
01391         break;
01392     case AVMEDIA_TYPE_AUDIO:
01393         bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
01394         bit_rate = bits_per_sample ? ctx->sample_rate * ctx->channels * bits_per_sample : ctx->bit_rate;
01395         break;
01396     default:
01397         bit_rate = 0;
01398         break;
01399     }
01400     return bit_rate;
01401 }
01402 
01403 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
01404 {
01405     int i, len, ret = 0;
01406 
01407     for (i = 0; i < 4; i++) {
01408         len = snprintf(buf, buf_size,
01409                        isprint(codec_tag&0xFF) ? "%c" : "[%d]", codec_tag&0xFF);
01410         buf      += len;
01411         buf_size  = buf_size > len ? buf_size - len : 0;
01412         ret      += len;
01413         codec_tag>>=8;
01414     }
01415     return ret;
01416 }
01417 
01418 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
01419 {
01420     const char *codec_name;
01421     const char *profile = NULL;
01422     AVCodec *p;
01423     char buf1[32];
01424     int bitrate;
01425     AVRational display_aspect_ratio;
01426 
01427     if (encode)
01428         p = avcodec_find_encoder(enc->codec_id);
01429     else
01430         p = avcodec_find_decoder(enc->codec_id);
01431 
01432     if (p) {
01433         codec_name = p->name;
01434         profile = av_get_profile_name(p, enc->profile);
01435     } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
01436         /* fake mpeg2 transport stream codec (currently not
01437            registered) */
01438         codec_name = "mpeg2ts";
01439     } else if (enc->codec_name[0] != '\0') {
01440         codec_name = enc->codec_name;
01441     } else {
01442         /* output avi tags */
01443         char tag_buf[32];
01444         av_get_codec_tag_string(tag_buf, sizeof(tag_buf), enc->codec_tag);
01445         snprintf(buf1, sizeof(buf1), "%s / 0x%04X", tag_buf, enc->codec_tag);
01446         codec_name = buf1;
01447     }
01448 
01449     switch(enc->codec_type) {
01450     case AVMEDIA_TYPE_VIDEO:
01451         snprintf(buf, buf_size,
01452                  "Video: %s%s",
01453                  codec_name, enc->mb_decision ? " (hq)" : "");
01454         if (profile)
01455             snprintf(buf + strlen(buf), buf_size - strlen(buf),
01456                      " (%s)", profile);
01457         if (enc->pix_fmt != PIX_FMT_NONE) {
01458             snprintf(buf + strlen(buf), buf_size - strlen(buf),
01459                      ", %s",
01460                      av_get_pix_fmt_name(enc->pix_fmt));
01461         }
01462         if (enc->width) {
01463             snprintf(buf + strlen(buf), buf_size - strlen(buf),
01464                      ", %dx%d",
01465                      enc->width, enc->height);
01466             if (enc->sample_aspect_ratio.num) {
01467                 av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
01468                           enc->width*enc->sample_aspect_ratio.num,
01469                           enc->height*enc->sample_aspect_ratio.den,
01470                           1024*1024);
01471                 snprintf(buf + strlen(buf), buf_size - strlen(buf),
01472                          " [PAR %d:%d DAR %d:%d]",
01473                          enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
01474                          display_aspect_ratio.num, display_aspect_ratio.den);
01475             }
01476             if(av_log_get_level() >= AV_LOG_DEBUG){
01477                 int g= av_gcd(enc->time_base.num, enc->time_base.den);
01478                 snprintf(buf + strlen(buf), buf_size - strlen(buf),
01479                      ", %d/%d",
01480                      enc->time_base.num/g, enc->time_base.den/g);
01481             }
01482         }
01483         if (encode) {
01484             snprintf(buf + strlen(buf), buf_size - strlen(buf),
01485                      ", q=%d-%d", enc->qmin, enc->qmax);
01486         }
01487         break;
01488     case AVMEDIA_TYPE_AUDIO:
01489         snprintf(buf, buf_size,
01490                  "Audio: %s",
01491                  codec_name);
01492         if (profile)
01493             snprintf(buf + strlen(buf), buf_size - strlen(buf),
01494                      " (%s)", profile);
01495         if (enc->sample_rate) {
01496             snprintf(buf + strlen(buf), buf_size - strlen(buf),
01497                      ", %d Hz", enc->sample_rate);
01498         }
01499         av_strlcat(buf, ", ", buf_size);
01500         av_get_channel_layout_string(buf + strlen(buf), buf_size - strlen(buf), enc->channels, enc->channel_layout);
01501         if (enc->sample_fmt != AV_SAMPLE_FMT_NONE) {
01502             snprintf(buf + strlen(buf), buf_size - strlen(buf),
01503                      ", %s", av_get_sample_fmt_name(enc->sample_fmt));
01504         }
01505         break;
01506     case AVMEDIA_TYPE_DATA:
01507         snprintf(buf, buf_size, "Data: %s", codec_name);
01508         break;
01509     case AVMEDIA_TYPE_SUBTITLE:
01510         snprintf(buf, buf_size, "Subtitle: %s", codec_name);
01511         break;
01512     case AVMEDIA_TYPE_ATTACHMENT:
01513         snprintf(buf, buf_size, "Attachment: %s", codec_name);
01514         break;
01515     default:
01516         snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
01517         return;
01518     }
01519     if (encode) {
01520         if (enc->flags & CODEC_FLAG_PASS1)
01521             snprintf(buf + strlen(buf), buf_size - strlen(buf),
01522                      ", pass 1");
01523         if (enc->flags & CODEC_FLAG_PASS2)
01524             snprintf(buf + strlen(buf), buf_size - strlen(buf),
01525                      ", pass 2");
01526     }
01527     bitrate = get_bit_rate(enc);
01528     if (bitrate != 0) {
01529         snprintf(buf + strlen(buf), buf_size - strlen(buf),
01530                  ", %d kb/s", bitrate / 1000);
01531     }
01532 }
01533 
01534 const char *av_get_profile_name(const AVCodec *codec, int profile)
01535 {
01536     const AVProfile *p;
01537     if (profile == FF_PROFILE_UNKNOWN || !codec->profiles)
01538         return NULL;
01539 
01540     for (p = codec->profiles; p->profile != FF_PROFILE_UNKNOWN; p++)
01541         if (p->profile == profile)
01542             return p->name;
01543 
01544     return NULL;
01545 }
01546 
01547 unsigned avcodec_version( void )
01548 {
01549   return LIBAVCODEC_VERSION_INT;
01550 }
01551 
01552 const char *avcodec_configuration(void)
01553 {
01554     return LIBAV_CONFIGURATION;
01555 }
01556 
01557 const char *avcodec_license(void)
01558 {
01559 #define LICENSE_PREFIX "libavcodec license: "
01560     return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;
01561 }
01562 
01563 void avcodec_flush_buffers(AVCodecContext *avctx)
01564 {
01565     if(HAVE_THREADS && avctx->active_thread_type&FF_THREAD_FRAME)
01566         ff_thread_flush(avctx);
01567     else if(avctx->codec->flush)
01568         avctx->codec->flush(avctx);
01569 }
01570 
01571 static void video_free_buffers(AVCodecContext *s)
01572 {
01573     AVCodecInternal *avci = s->internal;
01574     int i, j;
01575 
01576     if (!avci->buffer)
01577         return;
01578 
01579     if (avci->buffer_count)
01580         av_log(s, AV_LOG_WARNING, "Found %i unreleased buffers!\n",
01581                avci->buffer_count);
01582     for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
01583         InternalBuffer *buf = &avci->buffer[i];
01584         for(j=0; j<4; j++){
01585             av_freep(&buf->base[j]);
01586             buf->data[j]= NULL;
01587         }
01588     }
01589     av_freep(&avci->buffer);
01590 
01591     avci->buffer_count=0;
01592 }
01593 
01594 static void audio_free_buffers(AVCodecContext *avctx)
01595 {
01596     AVCodecInternal *avci = avctx->internal;
01597     InternalBuffer *buf;
01598 
01599     if (!avci->buffer)
01600         return;
01601     buf = avci->buffer;
01602 
01603     if (buf->extended_data) {
01604         av_free(buf->extended_data[0]);
01605         if (buf->extended_data != buf->data)
01606             av_free(buf->extended_data);
01607     }
01608     av_freep(&avci->buffer);
01609 }
01610 
01611 void avcodec_default_free_buffers(AVCodecContext *avctx)
01612 {
01613     switch (avctx->codec_type) {
01614     case AVMEDIA_TYPE_VIDEO:
01615         video_free_buffers(avctx);
01616         break;
01617     case AVMEDIA_TYPE_AUDIO:
01618         audio_free_buffers(avctx);
01619         break;
01620     default:
01621         break;
01622     }
01623 }
01624 
01625 #if FF_API_OLD_FF_PICT_TYPES
01626 char av_get_pict_type_char(int pict_type){
01627     return av_get_picture_type_char(pict_type);
01628 }
01629 #endif
01630 
01631 int av_get_bits_per_sample(enum CodecID codec_id){
01632     switch(codec_id){
01633     case CODEC_ID_ADPCM_SBPRO_2:
01634         return 2;
01635     case CODEC_ID_ADPCM_SBPRO_3:
01636         return 3;
01637     case CODEC_ID_ADPCM_SBPRO_4:
01638     case CODEC_ID_ADPCM_CT:
01639     case CODEC_ID_ADPCM_IMA_WAV:
01640     case CODEC_ID_ADPCM_IMA_QT:
01641     case CODEC_ID_ADPCM_SWF:
01642     case CODEC_ID_ADPCM_MS:
01643     case CODEC_ID_ADPCM_YAMAHA:
01644     case CODEC_ID_ADPCM_G722:
01645         return 4;
01646     case CODEC_ID_PCM_ALAW:
01647     case CODEC_ID_PCM_MULAW:
01648     case CODEC_ID_PCM_S8:
01649     case CODEC_ID_PCM_U8:
01650     case CODEC_ID_PCM_ZORK:
01651         return 8;
01652     case CODEC_ID_PCM_S16BE:
01653     case CODEC_ID_PCM_S16LE:
01654     case CODEC_ID_PCM_S16LE_PLANAR:
01655     case CODEC_ID_PCM_U16BE:
01656     case CODEC_ID_PCM_U16LE:
01657         return 16;
01658     case CODEC_ID_PCM_S24DAUD:
01659     case CODEC_ID_PCM_S24BE:
01660     case CODEC_ID_PCM_S24LE:
01661     case CODEC_ID_PCM_U24BE:
01662     case CODEC_ID_PCM_U24LE:
01663         return 24;
01664     case CODEC_ID_PCM_S32BE:
01665     case CODEC_ID_PCM_S32LE:
01666     case CODEC_ID_PCM_U32BE:
01667     case CODEC_ID_PCM_U32LE:
01668     case CODEC_ID_PCM_F32BE:
01669     case CODEC_ID_PCM_F32LE:
01670         return 32;
01671     case CODEC_ID_PCM_F64BE:
01672     case CODEC_ID_PCM_F64LE:
01673         return 64;
01674     default:
01675         return 0;
01676     }
01677 }
01678 
01679 #if FF_API_OLD_SAMPLE_FMT
01680 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt) {
01681     return av_get_bytes_per_sample(sample_fmt) << 3;
01682 }
01683 #endif
01684 
01685 #if !HAVE_THREADS
01686 int ff_thread_init(AVCodecContext *s){
01687     return -1;
01688 }
01689 #endif
01690 
01691 unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
01692 {
01693     unsigned int n = 0;
01694 
01695     while(v >= 0xff) {
01696         *s++ = 0xff;
01697         v -= 0xff;
01698         n++;
01699     }
01700     *s = v;
01701     n++;
01702     return n;
01703 }
01704 
01705 int ff_match_2uint16(const uint16_t (*tab)[2], int size, int a, int b){
01706     int i;
01707     for(i=0; i<size && !(tab[i][0]==a && tab[i][1]==b); i++);
01708     return i;
01709 }
01710 
01711 void av_log_missing_feature(void *avc, const char *feature, int want_sample)
01712 {
01713     av_log(avc, AV_LOG_WARNING, "%s not implemented. Update your Libav "
01714             "version to the newest one from Git. If the problem still "
01715             "occurs, it means that your file has a feature which has not "
01716             "been implemented.\n", feature);
01717     if(want_sample)
01718         av_log_ask_for_sample(avc, NULL);
01719 }
01720 
01721 void av_log_ask_for_sample(void *avc, const char *msg, ...)
01722 {
01723     va_list argument_list;
01724 
01725     va_start(argument_list, msg);
01726 
01727     if (msg)
01728         av_vlog(avc, AV_LOG_WARNING, msg, argument_list);
01729     av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
01730             "of this file to ftp://upload.libav.org/incoming/ "
01731             "and contact the libav-devel mailing list.\n");
01732 
01733     va_end(argument_list);
01734 }
01735 
01736 static AVHWAccel *first_hwaccel = NULL;
01737 
01738 void av_register_hwaccel(AVHWAccel *hwaccel)
01739 {
01740     AVHWAccel **p = &first_hwaccel;
01741     while (*p)
01742         p = &(*p)->next;
01743     *p = hwaccel;
01744     hwaccel->next = NULL;
01745 }
01746 
01747 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel)
01748 {
01749     return hwaccel ? hwaccel->next : first_hwaccel;
01750 }
01751 
01752 AVHWAccel *ff_find_hwaccel(enum CodecID codec_id, enum PixelFormat pix_fmt)
01753 {
01754     AVHWAccel *hwaccel=NULL;
01755 
01756     while((hwaccel= av_hwaccel_next(hwaccel))){
01757         if (   hwaccel->id      == codec_id
01758             && hwaccel->pix_fmt == pix_fmt)
01759             return hwaccel;
01760     }
01761     return NULL;
01762 }
01763 
01764 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
01765 {
01766     if (ff_lockmgr_cb) {
01767         if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY))
01768             return -1;
01769         if (ff_lockmgr_cb(&avformat_mutex, AV_LOCK_DESTROY))
01770             return -1;
01771     }
01772 
01773     ff_lockmgr_cb = cb;
01774 
01775     if (ff_lockmgr_cb) {
01776         if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_CREATE))
01777             return -1;
01778         if (ff_lockmgr_cb(&avformat_mutex, AV_LOCK_CREATE))
01779             return -1;
01780     }
01781     return 0;
01782 }
01783 
01784 int avpriv_lock_avformat(void)
01785 {
01786     if (ff_lockmgr_cb) {
01787         if ((*ff_lockmgr_cb)(&avformat_mutex, AV_LOCK_OBTAIN))
01788             return -1;
01789     }
01790     return 0;
01791 }
01792 
01793 int avpriv_unlock_avformat(void)
01794 {
01795     if (ff_lockmgr_cb) {
01796         if ((*ff_lockmgr_cb)(&avformat_mutex, AV_LOCK_RELEASE))
01797             return -1;
01798     }
01799     return 0;
01800 }
01801 
01802 unsigned int avpriv_toupper4(unsigned int x)
01803 {
01804     return     toupper( x     &0xFF)
01805             + (toupper((x>>8 )&0xFF)<<8 )
01806             + (toupper((x>>16)&0xFF)<<16)
01807             + (toupper((x>>24)&0xFF)<<24);
01808 }
01809 
01810 #if !HAVE_THREADS
01811 
01812 int ff_thread_get_buffer(AVCodecContext *avctx, AVFrame *f)
01813 {
01814     f->owner = avctx;
01815     return avctx->get_buffer(avctx, f);
01816 }
01817 
01818 void ff_thread_release_buffer(AVCodecContext *avctx, AVFrame *f)
01819 {
01820     f->owner->release_buffer(f->owner, f);
01821 }
01822 
01823 void ff_thread_finish_setup(AVCodecContext *avctx)
01824 {
01825 }
01826 
01827 void ff_thread_report_progress(AVFrame *f, int progress, int field)
01828 {
01829 }
01830 
01831 void ff_thread_await_progress(AVFrame *f, int progress, int field)
01832 {
01833 }
01834 
01835 #endif
01836 
01837 #if FF_API_THREAD_INIT
01838 int avcodec_thread_init(AVCodecContext *s, int thread_count)
01839 {
01840     s->thread_count = thread_count;
01841     return ff_thread_init(s);
01842 }
01843 #endif
01844 
01845 enum AVMediaType avcodec_get_type(enum CodecID codec_id)
01846 {
01847     if (codec_id <= CODEC_ID_NONE)
01848         return AVMEDIA_TYPE_UNKNOWN;
01849     else if (codec_id < CODEC_ID_FIRST_AUDIO)
01850         return AVMEDIA_TYPE_VIDEO;
01851     else if (codec_id < CODEC_ID_FIRST_SUBTITLE)
01852         return AVMEDIA_TYPE_AUDIO;
01853     else if (codec_id < CODEC_ID_FIRST_UNKNOWN)
01854         return AVMEDIA_TYPE_SUBTITLE;
01855 
01856     return AVMEDIA_TYPE_UNKNOWN;
01857 }
01858 
01859 int avcodec_is_open(AVCodecContext *s)
01860 {
01861     return !!s->internal;
01862 }
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