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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 FFmpeg.
00007  *
00008  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00028 /* needed for mkstemp() */
00029 #define _XOPEN_SOURCE 600
00030 
00031 #include "libavutil/avstring.h"
00032 #include "libavutil/integer.h"
00033 #include "libavutil/crc.h"
00034 #include "avcodec.h"
00035 #include "dsputil.h"
00036 #include "opt.h"
00037 #include "imgconvert.h"
00038 #include "audioconvert.h"
00039 #include "internal.h"
00040 #include <stdlib.h>
00041 #include <stdarg.h>
00042 #include <limits.h>
00043 #include <float.h>
00044 #if !HAVE_MKSTEMP
00045 #include <fcntl.h>
00046 #endif
00047 
00048 const uint8_t ff_reverse[256]={
00049 0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0,
00050 0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8,
00051 0x04,0x84,0x44,0xC4,0x24,0xA4,0x64,0xE4,0x14,0x94,0x54,0xD4,0x34,0xB4,0x74,0xF4,
00052 0x0C,0x8C,0x4C,0xCC,0x2C,0xAC,0x6C,0xEC,0x1C,0x9C,0x5C,0xDC,0x3C,0xBC,0x7C,0xFC,
00053 0x02,0x82,0x42,0xC2,0x22,0xA2,0x62,0xE2,0x12,0x92,0x52,0xD2,0x32,0xB2,0x72,0xF2,
00054 0x0A,0x8A,0x4A,0xCA,0x2A,0xAA,0x6A,0xEA,0x1A,0x9A,0x5A,0xDA,0x3A,0xBA,0x7A,0xFA,
00055 0x06,0x86,0x46,0xC6,0x26,0xA6,0x66,0xE6,0x16,0x96,0x56,0xD6,0x36,0xB6,0x76,0xF6,
00056 0x0E,0x8E,0x4E,0xCE,0x2E,0xAE,0x6E,0xEE,0x1E,0x9E,0x5E,0xDE,0x3E,0xBE,0x7E,0xFE,
00057 0x01,0x81,0x41,0xC1,0x21,0xA1,0x61,0xE1,0x11,0x91,0x51,0xD1,0x31,0xB1,0x71,0xF1,
00058 0x09,0x89,0x49,0xC9,0x29,0xA9,0x69,0xE9,0x19,0x99,0x59,0xD9,0x39,0xB9,0x79,0xF9,
00059 0x05,0x85,0x45,0xC5,0x25,0xA5,0x65,0xE5,0x15,0x95,0x55,0xD5,0x35,0xB5,0x75,0xF5,
00060 0x0D,0x8D,0x4D,0xCD,0x2D,0xAD,0x6D,0xED,0x1D,0x9D,0x5D,0xDD,0x3D,0xBD,0x7D,0xFD,
00061 0x03,0x83,0x43,0xC3,0x23,0xA3,0x63,0xE3,0x13,0x93,0x53,0xD3,0x33,0xB3,0x73,0xF3,
00062 0x0B,0x8B,0x4B,0xCB,0x2B,0xAB,0x6B,0xEB,0x1B,0x9B,0x5B,0xDB,0x3B,0xBB,0x7B,0xFB,
00063 0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7,
00064 0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF,
00065 };
00066 
00067 static int volatile entangled_thread_counter=0;
00068 int (*ff_lockmgr_cb)(void **mutex, enum AVLockOp op);
00069 static void *codec_mutex;
00070 
00071 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
00072 {
00073     if(min_size < *size)
00074         return ptr;
00075 
00076     *size= FFMAX(17*min_size/16 + 32, min_size);
00077 
00078     ptr= av_realloc(ptr, *size);
00079     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
00080         *size= 0;
00081 
00082     return ptr;
00083 }
00084 
00085 /* encoder management */
00086 static AVCodec *first_avcodec = NULL;
00087 
00088 AVCodec *av_codec_next(AVCodec *c){
00089     if(c) return c->next;
00090     else  return first_avcodec;
00091 }
00092 
00093 void avcodec_register(AVCodec *codec)
00094 {
00095     AVCodec **p;
00096     avcodec_init();
00097     p = &first_avcodec;
00098     while (*p != NULL) p = &(*p)->next;
00099     *p = codec;
00100     codec->next = NULL;
00101 }
00102 
00103 #if LIBAVCODEC_VERSION_MAJOR < 53
00104 void register_avcodec(AVCodec *codec)
00105 {
00106     avcodec_register(codec);
00107 }
00108 #endif
00109 
00110 void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
00111     s->coded_width = width;
00112     s->coded_height= height;
00113     s->width = -((-width )>>s->lowres);
00114     s->height= -((-height)>>s->lowres);
00115 }
00116 
00117 typedef struct InternalBuffer{
00118     int last_pic_num;
00119     uint8_t *base[4];
00120     uint8_t *data[4];
00121     int linesize[4];
00122     int width, height;
00123     enum PixelFormat pix_fmt;
00124 }InternalBuffer;
00125 
00126 #define INTERNAL_BUFFER_SIZE 32
00127 
00128 #define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
00129 
00130 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
00131     int w_align= 1;
00132     int h_align= 1;
00133 
00134     switch(s->pix_fmt){
00135     case PIX_FMT_YUV420P:
00136     case PIX_FMT_YUYV422:
00137     case PIX_FMT_UYVY422:
00138     case PIX_FMT_YUV422P:
00139     case PIX_FMT_YUV444P:
00140     case PIX_FMT_GRAY8:
00141     case PIX_FMT_GRAY16BE:
00142     case PIX_FMT_GRAY16LE:
00143     case PIX_FMT_YUVJ420P:
00144     case PIX_FMT_YUVJ422P:
00145     case PIX_FMT_YUVJ444P:
00146     case PIX_FMT_YUVA420P:
00147         w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
00148         h_align= 16;
00149         break;
00150     case PIX_FMT_YUV411P:
00151     case PIX_FMT_UYYVYY411:
00152         w_align=32;
00153         h_align=8;
00154         break;
00155     case PIX_FMT_YUV410P:
00156         if(s->codec_id == CODEC_ID_SVQ1){
00157             w_align=64;
00158             h_align=64;
00159         }
00160     case PIX_FMT_RGB555:
00161         if(s->codec_id == CODEC_ID_RPZA){
00162             w_align=4;
00163             h_align=4;
00164         }
00165     case PIX_FMT_PAL8:
00166     case PIX_FMT_BGR8:
00167     case PIX_FMT_RGB8:
00168         if(s->codec_id == CODEC_ID_SMC){
00169             w_align=4;
00170             h_align=4;
00171         }
00172         break;
00173     case PIX_FMT_BGR24:
00174         if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){
00175             w_align=4;
00176             h_align=4;
00177         }
00178         break;
00179     default:
00180         w_align= 1;
00181         h_align= 1;
00182         break;
00183     }
00184 
00185     *width = ALIGN(*width , w_align);
00186     *height= ALIGN(*height, h_align);
00187     if(s->codec_id == CODEC_ID_H264)
00188         *height+=2; // some of the optimized chroma MC reads one line too much
00189 }
00190 
00191 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h){
00192     if((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/8)
00193         return 0;
00194 
00195     av_log(av_log_ctx, AV_LOG_ERROR, "picture size invalid (%ux%u)\n", w, h);
00196     return -1;
00197 }
00198 
00199 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
00200     int i;
00201     int w= s->width;
00202     int h= s->height;
00203     InternalBuffer *buf;
00204     int *picture_number;
00205 
00206     if(pic->data[0]!=NULL) {
00207         av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");
00208         return -1;
00209     }
00210     if(s->internal_buffer_count >= INTERNAL_BUFFER_SIZE) {
00211         av_log(s, AV_LOG_ERROR, "internal_buffer_count overflow (missing release_buffer?)\n");
00212         return -1;
00213     }
00214 
00215     if(avcodec_check_dimensions(s,w,h))
00216         return -1;
00217 
00218     if(s->internal_buffer==NULL){
00219         s->internal_buffer= av_mallocz((INTERNAL_BUFFER_SIZE+1)*sizeof(InternalBuffer));
00220     }
00221 #if 0
00222     s->internal_buffer= av_fast_realloc(
00223         s->internal_buffer,
00224         &s->internal_buffer_size,
00225         sizeof(InternalBuffer)*FFMAX(99,  s->internal_buffer_count+1)/*FIXME*/
00226         );
00227 #endif
00228 
00229     buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
00230     picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE]).last_pic_num; //FIXME ugly hack
00231     (*picture_number)++;
00232 
00233     if(buf->base[0] && (buf->width != w || buf->height != h || buf->pix_fmt != s->pix_fmt)){
00234         for(i=0; i<4; i++){
00235             av_freep(&buf->base[i]);
00236             buf->data[i]= NULL;
00237         }
00238     }
00239 
00240     if(buf->base[0]){
00241         pic->age= *picture_number - buf->last_pic_num;
00242         buf->last_pic_num= *picture_number;
00243     }else{
00244         int h_chroma_shift, v_chroma_shift;
00245         int size[4] = {0};
00246         int tmpsize;
00247         AVPicture picture;
00248         int stride_align[4];
00249 
00250         avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
00251 
00252         avcodec_align_dimensions(s, &w, &h);
00253 
00254         if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
00255             w+= EDGE_WIDTH*2;
00256             h+= EDGE_WIDTH*2;
00257         }
00258 
00259         ff_fill_linesize(&picture, s->pix_fmt, w);
00260 
00261         for (i=0; i<4; i++){
00262 //STRIDE_ALIGN is 8 for SSE* but this does not work for SVQ1 chroma planes
00263 //we could change STRIDE_ALIGN to 16 for x86/sse but it would increase the
00264 //picture size unneccessarily in some cases. The solution here is not
00265 //pretty and better ideas are welcome!
00266 #if HAVE_MMX
00267             if(s->codec_id == CODEC_ID_SVQ1)
00268                 stride_align[i]= 16;
00269             else
00270 #endif
00271             stride_align[i] = STRIDE_ALIGN;
00272             picture.linesize[i] = ALIGN(picture.linesize[i], stride_align[i]);
00273         }
00274 
00275         tmpsize = ff_fill_pointer(&picture, NULL, s->pix_fmt, h);
00276         if (tmpsize < 0)
00277             return -1;
00278 
00279         for (i=0; i<3 && picture.data[i+1]; i++)
00280             size[i] = picture.data[i+1] - picture.data[i];
00281         size[i] = tmpsize - (picture.data[i] - picture.data[0]);
00282 
00283         buf->last_pic_num= -256*256*256*64;
00284         memset(buf->base, 0, sizeof(buf->base));
00285         memset(buf->data, 0, sizeof(buf->data));
00286 
00287         for(i=0; i<4 && size[i]; i++){
00288             const int h_shift= i==0 ? 0 : h_chroma_shift;
00289             const int v_shift= i==0 ? 0 : v_chroma_shift;
00290 
00291             buf->linesize[i]= picture.linesize[i];
00292 
00293             buf->base[i]= av_malloc(size[i]+16); //FIXME 16
00294             if(buf->base[i]==NULL) return -1;
00295             memset(buf->base[i], 128, size[i]);
00296 
00297             // no edge if EDEG EMU or not planar YUV
00298             if((s->flags&CODEC_FLAG_EMU_EDGE) || !size[2])
00299                 buf->data[i] = buf->base[i];
00300             else
00301                 buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), stride_align[i]);
00302         }
00303         if(size[1] && !size[2])
00304             ff_set_systematic_pal((uint32_t*)buf->data[1], s->pix_fmt);
00305         buf->width  = s->width;
00306         buf->height = s->height;
00307         buf->pix_fmt= s->pix_fmt;
00308         pic->age= 256*256*256*64;
00309     }
00310     pic->type= FF_BUFFER_TYPE_INTERNAL;
00311 
00312     for(i=0; i<4; i++){
00313         pic->base[i]= buf->base[i];
00314         pic->data[i]= buf->data[i];
00315         pic->linesize[i]= buf->linesize[i];
00316     }
00317     s->internal_buffer_count++;
00318 
00319     pic->reordered_opaque= s->reordered_opaque;
00320 
00321     if(s->debug&FF_DEBUG_BUFFERS)
00322         av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);
00323 
00324     return 0;
00325 }
00326 
00327 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
00328     int i;
00329     InternalBuffer *buf, *last;
00330 
00331     assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
00332     assert(s->internal_buffer_count);
00333 
00334     buf = NULL; /* avoids warning */
00335     for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
00336         buf= &((InternalBuffer*)s->internal_buffer)[i];
00337         if(buf->data[0] == pic->data[0])
00338             break;
00339     }
00340     assert(i < s->internal_buffer_count);
00341     s->internal_buffer_count--;
00342     last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
00343 
00344     FFSWAP(InternalBuffer, *buf, *last);
00345 
00346     for(i=0; i<4; i++){
00347         pic->data[i]=NULL;
00348 //        pic->base[i]=NULL;
00349     }
00350 //printf("R%X\n", pic->opaque);
00351 
00352     if(s->debug&FF_DEBUG_BUFFERS)
00353         av_log(s, AV_LOG_DEBUG, "default_release_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);
00354 }
00355 
00356 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
00357     AVFrame temp_pic;
00358     int i;
00359 
00360     /* If no picture return a new buffer */
00361     if(pic->data[0] == NULL) {
00362         /* We will copy from buffer, so must be readable */
00363         pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
00364         return s->get_buffer(s, pic);
00365     }
00366 
00367     /* If internal buffer type return the same buffer */
00368     if(pic->type == FF_BUFFER_TYPE_INTERNAL)
00369         return 0;
00370 
00371     /*
00372      * Not internal type and reget_buffer not overridden, emulate cr buffer
00373      */
00374     temp_pic = *pic;
00375     for(i = 0; i < 4; i++)
00376         pic->data[i] = pic->base[i] = NULL;
00377     pic->opaque = NULL;
00378     /* Allocate new frame */
00379     if (s->get_buffer(s, pic))
00380         return -1;
00381     /* Copy image data from old buffer to new buffer */
00382     av_picture_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
00383              s->height);
00384     s->release_buffer(s, &temp_pic); // Release old frame
00385     return 0;
00386 }
00387 
00388 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
00389     int i;
00390 
00391     for(i=0; i<count; i++){
00392         int r= func(c, (char*)arg + i*size);
00393         if(ret) ret[i]= r;
00394     }
00395     return 0;
00396 }
00397 
00398 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat *fmt){
00399     while (*fmt != PIX_FMT_NONE && ff_is_hwaccel_pix_fmt(*fmt))
00400         ++fmt;
00401     return fmt[0];
00402 }
00403 
00404 void avcodec_get_frame_defaults(AVFrame *pic){
00405     memset(pic, 0, sizeof(AVFrame));
00406 
00407     pic->pts= AV_NOPTS_VALUE;
00408     pic->key_frame= 1;
00409 }
00410 
00411 AVFrame *avcodec_alloc_frame(void){
00412     AVFrame *pic= av_malloc(sizeof(AVFrame));
00413 
00414     if(pic==NULL) return NULL;
00415 
00416     avcodec_get_frame_defaults(pic);
00417 
00418     return pic;
00419 }
00420 
00421 int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
00422 {
00423     int ret= -1;
00424 
00425     /* If there is a user-supplied mutex locking routine, call it. */
00426     if (ff_lockmgr_cb) {
00427         if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
00428             return -1;
00429     }
00430 
00431     entangled_thread_counter++;
00432     if(entangled_thread_counter != 1){
00433         av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
00434         goto end;
00435     }
00436 
00437     if(avctx->codec || !codec)
00438         goto end;
00439 
00440     if (codec->priv_data_size > 0) {
00441         avctx->priv_data = av_mallocz(codec->priv_data_size);
00442         if (!avctx->priv_data) {
00443             ret = AVERROR(ENOMEM);
00444             goto end;
00445         }
00446     } else {
00447         avctx->priv_data = NULL;
00448     }
00449 
00450     if(avctx->coded_width && avctx->coded_height)
00451         avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
00452     else if(avctx->width && avctx->height)
00453         avcodec_set_dimensions(avctx, avctx->width, avctx->height);
00454 
00455     if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height)){
00456         av_freep(&avctx->priv_data);
00457         ret = AVERROR(EINVAL);
00458         goto end;
00459     }
00460 
00461     avctx->codec = codec;
00462     avctx->codec_id = codec->id;
00463     avctx->frame_number = 0;
00464     if(avctx->codec->init){
00465         ret = avctx->codec->init(avctx);
00466         if (ret < 0) {
00467             av_freep(&avctx->priv_data);
00468             avctx->codec= NULL;
00469             goto end;
00470         }
00471     }
00472     ret=0;
00473 end:
00474     entangled_thread_counter--;
00475 
00476     /* Release any user-supplied mutex. */
00477     if (ff_lockmgr_cb) {
00478         (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
00479     }
00480     return ret;
00481 }
00482 
00483 int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
00484                          const short *samples)
00485 {
00486     if(buf_size < FF_MIN_BUFFER_SIZE && 0){
00487         av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
00488         return -1;
00489     }
00490     if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
00491         int ret = avctx->codec->encode(avctx, buf, buf_size, samples);
00492         avctx->frame_number++;
00493         return ret;
00494     }else
00495         return 0;
00496 }
00497 
00498 int attribute_align_arg avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
00499                          const AVFrame *pict)
00500 {
00501     if(buf_size < FF_MIN_BUFFER_SIZE){
00502         av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
00503         return -1;
00504     }
00505     if(avcodec_check_dimensions(avctx,avctx->width,avctx->height))
00506         return -1;
00507     if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
00508         int ret = avctx->codec->encode(avctx, buf, buf_size, pict);
00509         avctx->frame_number++;
00510         emms_c(); //needed to avoid an emms_c() call before every return;
00511 
00512         return ret;
00513     }else
00514         return 0;
00515 }
00516 
00517 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
00518                             const AVSubtitle *sub)
00519 {
00520     int ret;
00521     if(sub->start_display_time) {
00522         av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");
00523         return -1;
00524     }
00525     if(sub->num_rects == 0 || !sub->rects)
00526         return -1;
00527     ret = avctx->codec->encode(avctx, buf, buf_size, sub);
00528     avctx->frame_number++;
00529     return ret;
00530 }
00531 
00532 int attribute_align_arg avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
00533                          int *got_picture_ptr,
00534                          const uint8_t *buf, int buf_size)
00535 {
00536     int ret;
00537 
00538     *got_picture_ptr= 0;
00539     if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height))
00540         return -1;
00541     if((avctx->codec->capabilities & CODEC_CAP_DELAY) || buf_size){
00542         ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
00543                                 buf, buf_size);
00544 
00545         emms_c(); //needed to avoid an emms_c() call before every return;
00546 
00547         if (*got_picture_ptr)
00548             avctx->frame_number++;
00549     }else
00550         ret= 0;
00551 
00552     return ret;
00553 }
00554 
00555 int attribute_align_arg avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
00556                          int *frame_size_ptr,
00557                          const uint8_t *buf, int buf_size)
00558 {
00559     int ret;
00560 
00561     if((avctx->codec->capabilities & CODEC_CAP_DELAY) || buf_size){
00562         //FIXME remove the check below _after_ ensuring that all audio check that the available space is enough
00563         if(*frame_size_ptr < AVCODEC_MAX_AUDIO_FRAME_SIZE){
00564             av_log(avctx, AV_LOG_ERROR, "buffer smaller than AVCODEC_MAX_AUDIO_FRAME_SIZE\n");
00565             return -1;
00566         }
00567         if(*frame_size_ptr < FF_MIN_BUFFER_SIZE ||
00568         *frame_size_ptr < avctx->channels * avctx->frame_size * sizeof(int16_t)){
00569             av_log(avctx, AV_LOG_ERROR, "buffer %d too small\n", *frame_size_ptr);
00570             return -1;
00571         }
00572 
00573         ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
00574                                 buf, buf_size);
00575         avctx->frame_number++;
00576     }else{
00577         ret= 0;
00578         *frame_size_ptr=0;
00579     }
00580     return ret;
00581 }
00582 
00583 int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
00584                             int *got_sub_ptr,
00585                             const uint8_t *buf, int buf_size)
00586 {
00587     int ret;
00588 
00589     *got_sub_ptr = 0;
00590     ret = avctx->codec->decode(avctx, sub, got_sub_ptr,
00591                                buf, buf_size);
00592     if (*got_sub_ptr)
00593         avctx->frame_number++;
00594     return ret;
00595 }
00596 
00597 int avcodec_close(AVCodecContext *avctx)
00598 {
00599     /* If there is a user-supplied mutex locking routine, call it. */
00600     if (ff_lockmgr_cb) {
00601         if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))
00602             return -1;
00603     }
00604 
00605     entangled_thread_counter++;
00606     if(entangled_thread_counter != 1){
00607         av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
00608         entangled_thread_counter--;
00609         return -1;
00610     }
00611 
00612     if (HAVE_THREADS && avctx->thread_opaque)
00613         avcodec_thread_free(avctx);
00614     if (avctx->codec->close)
00615         avctx->codec->close(avctx);
00616     avcodec_default_free_buffers(avctx);
00617     av_freep(&avctx->priv_data);
00618     avctx->codec = NULL;
00619     entangled_thread_counter--;
00620 
00621     /* Release any user-supplied mutex. */
00622     if (ff_lockmgr_cb) {
00623         (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
00624     }
00625     return 0;
00626 }
00627 
00628 AVCodec *avcodec_find_encoder(enum CodecID id)
00629 {
00630     AVCodec *p;
00631     p = first_avcodec;
00632     while (p) {
00633         if (p->encode != NULL && p->id == id)
00634             return p;
00635         p = p->next;
00636     }
00637     return NULL;
00638 }
00639 
00640 AVCodec *avcodec_find_encoder_by_name(const char *name)
00641 {
00642     AVCodec *p;
00643     if (!name)
00644         return NULL;
00645     p = first_avcodec;
00646     while (p) {
00647         if (p->encode != NULL && strcmp(name,p->name) == 0)
00648             return p;
00649         p = p->next;
00650     }
00651     return NULL;
00652 }
00653 
00654 AVCodec *avcodec_find_decoder(enum CodecID id)
00655 {
00656     AVCodec *p;
00657     p = first_avcodec;
00658     while (p) {
00659         if (p->decode != NULL && p->id == id)
00660             return p;
00661         p = p->next;
00662     }
00663     return NULL;
00664 }
00665 
00666 AVCodec *avcodec_find_decoder_by_name(const char *name)
00667 {
00668     AVCodec *p;
00669     if (!name)
00670         return NULL;
00671     p = first_avcodec;
00672     while (p) {
00673         if (p->decode != NULL && strcmp(name,p->name) == 0)
00674             return p;
00675         p = p->next;
00676     }
00677     return NULL;
00678 }
00679 
00680 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
00681 {
00682     const char *codec_name;
00683     AVCodec *p;
00684     char buf1[32];
00685     int bitrate;
00686     AVRational display_aspect_ratio;
00687 
00688     if (encode)
00689         p = avcodec_find_encoder(enc->codec_id);
00690     else
00691         p = avcodec_find_decoder(enc->codec_id);
00692 
00693     if (p) {
00694         codec_name = p->name;
00695     } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
00696         /* fake mpeg2 transport stream codec (currently not
00697            registered) */
00698         codec_name = "mpeg2ts";
00699     } else if (enc->codec_name[0] != '\0') {
00700         codec_name = enc->codec_name;
00701     } else {
00702         /* output avi tags */
00703         if(   isprint(enc->codec_tag&0xFF) && isprint((enc->codec_tag>>8)&0xFF)
00704            && isprint((enc->codec_tag>>16)&0xFF) && isprint((enc->codec_tag>>24)&0xFF)){
00705             snprintf(buf1, sizeof(buf1), "%c%c%c%c / 0x%04X",
00706                      enc->codec_tag & 0xff,
00707                      (enc->codec_tag >> 8) & 0xff,
00708                      (enc->codec_tag >> 16) & 0xff,
00709                      (enc->codec_tag >> 24) & 0xff,
00710                       enc->codec_tag);
00711         } else {
00712             snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
00713         }
00714         codec_name = buf1;
00715     }
00716 
00717     switch(enc->codec_type) {
00718     case CODEC_TYPE_VIDEO:
00719         snprintf(buf, buf_size,
00720                  "Video: %s%s",
00721                  codec_name, enc->mb_decision ? " (hq)" : "");
00722         if (enc->pix_fmt != PIX_FMT_NONE) {
00723             snprintf(buf + strlen(buf), buf_size - strlen(buf),
00724                      ", %s",
00725                      avcodec_get_pix_fmt_name(enc->pix_fmt));
00726         }
00727         if (enc->width) {
00728             snprintf(buf + strlen(buf), buf_size - strlen(buf),
00729                      ", %dx%d",
00730                      enc->width, enc->height);
00731             if (enc->sample_aspect_ratio.num) {
00732                 av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
00733                           enc->width*enc->sample_aspect_ratio.num,
00734                           enc->height*enc->sample_aspect_ratio.den,
00735                           1024*1024);
00736                 snprintf(buf + strlen(buf), buf_size - strlen(buf),
00737                          " [PAR %d:%d DAR %d:%d]",
00738                          enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
00739                          display_aspect_ratio.num, display_aspect_ratio.den);
00740             }
00741             if(av_log_get_level() >= AV_LOG_DEBUG){
00742                 int g= av_gcd(enc->time_base.num, enc->time_base.den);
00743                 snprintf(buf + strlen(buf), buf_size - strlen(buf),
00744                      ", %d/%d",
00745                      enc->time_base.num/g, enc->time_base.den/g);
00746             }
00747         }
00748         if (encode) {
00749             snprintf(buf + strlen(buf), buf_size - strlen(buf),
00750                      ", q=%d-%d", enc->qmin, enc->qmax);
00751         }
00752         bitrate = enc->bit_rate;
00753         break;
00754     case CODEC_TYPE_AUDIO:
00755         snprintf(buf, buf_size,
00756                  "Audio: %s",
00757                  codec_name);
00758         if (enc->sample_rate) {
00759             snprintf(buf + strlen(buf), buf_size - strlen(buf),
00760                      ", %d Hz", enc->sample_rate);
00761         }
00762         av_strlcat(buf, ", ", buf_size);
00763         avcodec_get_channel_layout_string(buf + strlen(buf), buf_size - strlen(buf), enc->channels, enc->channel_layout);
00764         if (enc->sample_fmt != SAMPLE_FMT_NONE) {
00765             snprintf(buf + strlen(buf), buf_size - strlen(buf),
00766                      ", %s", avcodec_get_sample_fmt_name(enc->sample_fmt));
00767         }
00768 
00769         /* for PCM codecs, compute bitrate directly */
00770         switch(enc->codec_id) {
00771         case CODEC_ID_PCM_F64BE:
00772         case CODEC_ID_PCM_F64LE:
00773             bitrate = enc->sample_rate * enc->channels * 64;
00774             break;
00775         case CODEC_ID_PCM_S32LE:
00776         case CODEC_ID_PCM_S32BE:
00777         case CODEC_ID_PCM_U32LE:
00778         case CODEC_ID_PCM_U32BE:
00779         case CODEC_ID_PCM_F32BE:
00780         case CODEC_ID_PCM_F32LE:
00781             bitrate = enc->sample_rate * enc->channels * 32;
00782             break;
00783         case CODEC_ID_PCM_S24LE:
00784         case CODEC_ID_PCM_S24BE:
00785         case CODEC_ID_PCM_U24LE:
00786         case CODEC_ID_PCM_U24BE:
00787         case CODEC_ID_PCM_S24DAUD:
00788             bitrate = enc->sample_rate * enc->channels * 24;
00789             break;
00790         case CODEC_ID_PCM_S16LE:
00791         case CODEC_ID_PCM_S16BE:
00792         case CODEC_ID_PCM_S16LE_PLANAR:
00793         case CODEC_ID_PCM_U16LE:
00794         case CODEC_ID_PCM_U16BE:
00795             bitrate = enc->sample_rate * enc->channels * 16;
00796             break;
00797         case CODEC_ID_PCM_S8:
00798         case CODEC_ID_PCM_U8:
00799         case CODEC_ID_PCM_ALAW:
00800         case CODEC_ID_PCM_MULAW:
00801         case CODEC_ID_PCM_ZORK:
00802             bitrate = enc->sample_rate * enc->channels * 8;
00803             break;
00804         default:
00805             bitrate = enc->bit_rate;
00806             break;
00807         }
00808         break;
00809     case CODEC_TYPE_DATA:
00810         snprintf(buf, buf_size, "Data: %s", codec_name);
00811         bitrate = enc->bit_rate;
00812         break;
00813     case CODEC_TYPE_SUBTITLE:
00814         snprintf(buf, buf_size, "Subtitle: %s", codec_name);
00815         bitrate = enc->bit_rate;
00816         break;
00817     case CODEC_TYPE_ATTACHMENT:
00818         snprintf(buf, buf_size, "Attachment: %s", codec_name);
00819         bitrate = enc->bit_rate;
00820         break;
00821     default:
00822         snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
00823         return;
00824     }
00825     if (encode) {
00826         if (enc->flags & CODEC_FLAG_PASS1)
00827             snprintf(buf + strlen(buf), buf_size - strlen(buf),
00828                      ", pass 1");
00829         if (enc->flags & CODEC_FLAG_PASS2)
00830             snprintf(buf + strlen(buf), buf_size - strlen(buf),
00831                      ", pass 2");
00832     }
00833     if (bitrate != 0) {
00834         snprintf(buf + strlen(buf), buf_size - strlen(buf),
00835                  ", %d kb/s", bitrate / 1000);
00836     }
00837 }
00838 
00839 unsigned avcodec_version( void )
00840 {
00841   return LIBAVCODEC_VERSION_INT;
00842 }
00843 
00844 void avcodec_init(void)
00845 {
00846     static int initialized = 0;
00847 
00848     if (initialized != 0)
00849         return;
00850     initialized = 1;
00851 
00852     dsputil_static_init();
00853 }
00854 
00855 void avcodec_flush_buffers(AVCodecContext *avctx)
00856 {
00857     if(avctx->codec->flush)
00858         avctx->codec->flush(avctx);
00859 }
00860 
00861 void avcodec_default_free_buffers(AVCodecContext *s){
00862     int i, j;
00863 
00864     if(s->internal_buffer==NULL) return;
00865 
00866     for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
00867         InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
00868         for(j=0; j<4; j++){
00869             av_freep(&buf->base[j]);
00870             buf->data[j]= NULL;
00871         }
00872     }
00873     av_freep(&s->internal_buffer);
00874 
00875     s->internal_buffer_count=0;
00876 }
00877 
00878 char av_get_pict_type_char(int pict_type){
00879     switch(pict_type){
00880     case FF_I_TYPE: return 'I';
00881     case FF_P_TYPE: return 'P';
00882     case FF_B_TYPE: return 'B';
00883     case FF_S_TYPE: return 'S';
00884     case FF_SI_TYPE:return 'i';
00885     case FF_SP_TYPE:return 'p';
00886     case FF_BI_TYPE:return 'b';
00887     default:        return '?';
00888     }
00889 }
00890 
00891 int av_get_bits_per_sample(enum CodecID codec_id){
00892     switch(codec_id){
00893     case CODEC_ID_ADPCM_SBPRO_2:
00894         return 2;
00895     case CODEC_ID_ADPCM_SBPRO_3:
00896         return 3;
00897     case CODEC_ID_ADPCM_SBPRO_4:
00898     case CODEC_ID_ADPCM_CT:
00899         return 4;
00900     case CODEC_ID_PCM_ALAW:
00901     case CODEC_ID_PCM_MULAW:
00902     case CODEC_ID_PCM_S8:
00903     case CODEC_ID_PCM_U8:
00904     case CODEC_ID_PCM_ZORK:
00905         return 8;
00906     case CODEC_ID_PCM_S16BE:
00907     case CODEC_ID_PCM_S16LE:
00908     case CODEC_ID_PCM_S16LE_PLANAR:
00909     case CODEC_ID_PCM_U16BE:
00910     case CODEC_ID_PCM_U16LE:
00911         return 16;
00912     case CODEC_ID_PCM_S24DAUD:
00913     case CODEC_ID_PCM_S24BE:
00914     case CODEC_ID_PCM_S24LE:
00915     case CODEC_ID_PCM_U24BE:
00916     case CODEC_ID_PCM_U24LE:
00917         return 24;
00918     case CODEC_ID_PCM_S32BE:
00919     case CODEC_ID_PCM_S32LE:
00920     case CODEC_ID_PCM_U32BE:
00921     case CODEC_ID_PCM_U32LE:
00922     case CODEC_ID_PCM_F32BE:
00923     case CODEC_ID_PCM_F32LE:
00924         return 32;
00925     case CODEC_ID_PCM_F64BE:
00926     case CODEC_ID_PCM_F64LE:
00927         return 64;
00928     default:
00929         return 0;
00930     }
00931 }
00932 
00933 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt) {
00934     switch (sample_fmt) {
00935     case SAMPLE_FMT_U8:
00936         return 8;
00937     case SAMPLE_FMT_S16:
00938         return 16;
00939     case SAMPLE_FMT_S32:
00940     case SAMPLE_FMT_FLT:
00941         return 32;
00942     case SAMPLE_FMT_DBL:
00943         return 64;
00944     default:
00945         return 0;
00946     }
00947 }
00948 
00949 #if !HAVE_THREADS
00950 int avcodec_thread_init(AVCodecContext *s, int thread_count){
00951     return -1;
00952 }
00953 #endif
00954 
00955 unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
00956 {
00957     unsigned int n = 0;
00958 
00959     while(v >= 0xff) {
00960         *s++ = 0xff;
00961         v -= 0xff;
00962         n++;
00963     }
00964     *s = v;
00965     n++;
00966     return n;
00967 }
00968 
00969 /* Wrapper to work around the lack of mkstemp() on mingw/cygin.
00970  * Also, tries to create file in /tmp first, if possible.
00971  * *prefix can be a character constant; *filename will be allocated internally.
00972  * Returns file descriptor of opened file (or -1 on error)
00973  * and opened file name in **filename. */
00974 int av_tempfile(char *prefix, char **filename) {
00975     int fd=-1;
00976 #if !HAVE_MKSTEMP
00977     *filename = tempnam(".", prefix);
00978 #else
00979     size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */
00980     *filename = av_malloc(len);
00981 #endif
00982     /* -----common section-----*/
00983     if (*filename == NULL) {
00984         av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n");
00985         return -1;
00986     }
00987 #if !HAVE_MKSTEMP
00988     fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444);
00989 #else
00990     snprintf(*filename, len, "/tmp/%sXXXXXX", prefix);
00991     fd = mkstemp(*filename);
00992     if (fd < 0) {
00993         snprintf(*filename, len, "./%sXXXXXX", prefix);
00994         fd = mkstemp(*filename);
00995     }
00996 #endif
00997     /* -----common section-----*/
00998     if (fd < 0) {
00999         av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename);
01000         return -1;
01001     }
01002     return fd; /* success */
01003 }
01004 
01005 typedef struct {
01006     const char *abbr;
01007     int width, height;
01008 } VideoFrameSizeAbbr;
01009 
01010 typedef struct {
01011     const char *abbr;
01012     int rate_num, rate_den;
01013 } VideoFrameRateAbbr;
01014 
01015 static const VideoFrameSizeAbbr video_frame_size_abbrs[] = {
01016     { "ntsc",      720, 480 },
01017     { "pal",       720, 576 },
01018     { "qntsc",     352, 240 }, /* VCD compliant NTSC */
01019     { "qpal",      352, 288 }, /* VCD compliant PAL */
01020     { "sntsc",     640, 480 }, /* square pixel NTSC */
01021     { "spal",      768, 576 }, /* square pixel PAL */
01022     { "film",      352, 240 },
01023     { "ntsc-film", 352, 240 },
01024     { "sqcif",     128,  96 },
01025     { "qcif",      176, 144 },
01026     { "cif",       352, 288 },
01027     { "4cif",      704, 576 },
01028     { "qqvga",     160, 120 },
01029     { "qvga",      320, 240 },
01030     { "vga",       640, 480 },
01031     { "svga",      800, 600 },
01032     { "xga",      1024, 768 },
01033     { "uxga",     1600,1200 },
01034     { "qxga",     2048,1536 },
01035     { "sxga",     1280,1024 },
01036     { "qsxga",    2560,2048 },
01037     { "hsxga",    5120,4096 },
01038     { "wvga",      852, 480 },
01039     { "wxga",     1366, 768 },
01040     { "wsxga",    1600,1024 },
01041     { "wuxga",    1920,1200 },
01042     { "woxga",    2560,1600 },
01043     { "wqsxga",   3200,2048 },
01044     { "wquxga",   3840,2400 },
01045     { "whsxga",   6400,4096 },
01046     { "whuxga",   7680,4800 },
01047     { "cga",       320, 200 },
01048     { "ega",       640, 350 },
01049     { "hd480",     852, 480 },
01050     { "hd720",    1280, 720 },
01051     { "hd1080",   1920,1080 },
01052 };
01053 
01054 static const VideoFrameRateAbbr video_frame_rate_abbrs[]= {
01055     { "ntsc",      30000, 1001 },
01056     { "pal",          25,    1 },
01057     { "qntsc",     30000, 1001 }, /* VCD compliant NTSC */
01058     { "qpal",         25,    1 }, /* VCD compliant PAL */
01059     { "sntsc",     30000, 1001 }, /* square pixel NTSC */
01060     { "spal",         25,    1 }, /* square pixel PAL */
01061     { "film",         24,    1 },
01062     { "ntsc-film", 24000, 1001 },
01063 };
01064 
01065 int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str)
01066 {
01067     int i;
01068     int n = FF_ARRAY_ELEMS(video_frame_size_abbrs);
01069     char *p;
01070     int frame_width = 0, frame_height = 0;
01071 
01072     for(i=0;i<n;i++) {
01073         if (!strcmp(video_frame_size_abbrs[i].abbr, str)) {
01074             frame_width = video_frame_size_abbrs[i].width;
01075             frame_height = video_frame_size_abbrs[i].height;
01076             break;
01077         }
01078     }
01079     if (i == n) {
01080         p = str;
01081         frame_width = strtol(p, &p, 10);
01082         if (*p)
01083             p++;
01084         frame_height = strtol(p, &p, 10);
01085     }
01086     if (frame_width <= 0 || frame_height <= 0)
01087         return -1;
01088     *width_ptr = frame_width;
01089     *height_ptr = frame_height;
01090     return 0;
01091 }
01092 
01093 int av_parse_video_frame_rate(AVRational *frame_rate, const char *arg)
01094 {
01095     int i;
01096     int n = FF_ARRAY_ELEMS(video_frame_rate_abbrs);
01097     char* cp;
01098 
01099     /* First, we check our abbreviation table */
01100     for (i = 0; i < n; ++i)
01101          if (!strcmp(video_frame_rate_abbrs[i].abbr, arg)) {
01102              frame_rate->num = video_frame_rate_abbrs[i].rate_num;
01103              frame_rate->den = video_frame_rate_abbrs[i].rate_den;
01104              return 0;
01105          }
01106 
01107     /* Then, we try to parse it as fraction */
01108     cp = strchr(arg, '/');
01109     if (!cp)
01110         cp = strchr(arg, ':');
01111     if (cp) {
01112         char* cpp;
01113         frame_rate->num = strtol(arg, &cpp, 10);
01114         if (cpp != arg || cpp == cp)
01115             frame_rate->den = strtol(cp+1, &cpp, 10);
01116         else
01117            frame_rate->num = 0;
01118     }
01119     else {
01120         /* Finally we give up and parse it as double */
01121         AVRational time_base = av_d2q(strtod(arg, 0), 1001000);
01122         frame_rate->den = time_base.den;
01123         frame_rate->num = time_base.num;
01124     }
01125     if (!frame_rate->num || !frame_rate->den)
01126         return -1;
01127     else
01128         return 0;
01129 }
01130 
01131 void ff_log_missing_feature(void *avc, const char *feature, int want_sample)
01132 {
01133     av_log(avc, AV_LOG_WARNING, "%s not implemented. Update your FFmpeg "
01134             "version to the newest one from SVN. If the problem still "
01135             "occurs, it means that your file has a feature which has not "
01136             "been implemented.", feature);
01137     if(want_sample)
01138         ff_log_ask_for_sample(avc, NULL);
01139     else
01140         av_log(avc, AV_LOG_WARNING, "\n");
01141 }
01142 
01143 void ff_log_ask_for_sample(void *avc, const char *msg)
01144 {
01145     if (msg)
01146         av_log(avc, AV_LOG_WARNING, "%s ", msg);
01147     av_log(avc, AV_LOG_WARNING, "If you want to help, upload a sample "
01148             "of this file to ftp://upload.ffmpeg.org/MPlayer/incoming/ "
01149             "and contact the ffmpeg-devel mailing list.\n");
01150 }
01151 
01152 static AVHWAccel *first_hwaccel = NULL;
01153 
01154 void av_register_hwaccel(AVHWAccel *hwaccel)
01155 {
01156     AVHWAccel **p = &first_hwaccel;
01157     while (*p)
01158         p = &(*p)->next;
01159     *p = hwaccel;
01160     hwaccel->next = NULL;
01161 }
01162 
01163 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel)
01164 {
01165     return hwaccel ? hwaccel->next : first_hwaccel;
01166 }
01167 
01168 AVHWAccel *ff_find_hwaccel(enum CodecID codec_id, enum PixelFormat pix_fmt)
01169 {
01170     AVHWAccel *hwaccel=NULL;
01171 
01172     while((hwaccel= av_hwaccel_next(hwaccel))){
01173         if (   hwaccel->id      == codec_id
01174             && hwaccel->pix_fmt == pix_fmt)
01175             return hwaccel;
01176     }
01177     return NULL;
01178 }
01179 
01180 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op))
01181 {
01182     if (ff_lockmgr_cb) {
01183         if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_DESTROY))
01184             return -1;
01185     }
01186 
01187     ff_lockmgr_cb = cb;
01188 
01189     if (ff_lockmgr_cb) {
01190         if (ff_lockmgr_cb(&codec_mutex, AV_LOCK_CREATE))
01191             return -1;
01192     }
01193     return 0;
01194 }

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