3 * Copyright (c) 2001 Fabrice Bellard.
4 * Copyright (c) 2003 Michel Bardiaux for the av_log API
5 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 #include "mpegvideo.h"
34 const uint8_t ff_sqrt_tab[128]={
35 0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5,
36 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
37 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
38 9, 9, 9, 9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11
41 const uint8_t ff_log2_tab[256]={
42 0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
43 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
44 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
45 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
46 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
47 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
48 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
49 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
52 void avcodec_default_free_buffers(AVCodecContext *s);
54 void *av_mallocz(unsigned int size)
58 ptr = av_malloc(size);
65 char *av_strdup(const char *s)
78 * realloc which does nothing if the block is large enough
80 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
85 *size= FFMAX(17*min_size/16 + 32, min_size);
87 return av_realloc(ptr, *size);
91 static unsigned int last_static = 0;
92 static unsigned int allocated_static = 0;
93 static void** array_static = NULL;
96 * allocation of static arrays - do not use for normal allocation.
98 void *av_mallocz_static(unsigned int size)
100 void *ptr = av_mallocz(size);
103 array_static =av_fast_realloc(array_static, &allocated_static, sizeof(void*)*(last_static+1));
106 array_static[last_static++] = ptr;
113 * same as above, but does realloc
116 void *av_realloc_static(void *ptr, unsigned int size)
120 return av_mallocz_static(size);
121 /* Look for the old ptr */
122 for(i = 0; i < last_static; i++) {
123 if(array_static[i] == ptr) {
124 array_static[i] = av_realloc(array_static[i], size);
125 return array_static[i];
133 * free all static arrays and reset pointers to 0.
135 void av_free_static(void)
138 av_freep(&array_static[--last_static]);
140 av_freep(&array_static);
144 * Frees memory and sets the pointer to NULL.
145 * @param arg pointer to the pointer which should be freed
147 void av_freep(void *arg)
149 void **ptr= (void**)arg;
154 /* encoder management */
155 AVCodec *first_avcodec = NULL;
157 void register_avcodec(AVCodec *format)
161 while (*p != NULL) p = &(*p)->next;
166 void avcodec_set_dimensions(AVCodecContext *s, int width, int height){
167 s->coded_width = width;
168 s->coded_height= height;
169 s->width = -((-width )>>s->lowres);
170 s->height= -((-height)>>s->lowres);
173 typedef struct InternalBuffer{
180 #define INTERNAL_BUFFER_SIZE 32
182 #define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
184 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
189 case PIX_FMT_YUV420P:
191 case PIX_FMT_UYVY422:
192 case PIX_FMT_YUV422P:
193 case PIX_FMT_YUV444P:
195 case PIX_FMT_YUVJ420P:
196 case PIX_FMT_YUVJ422P:
197 case PIX_FMT_YUVJ444P:
198 w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
201 case PIX_FMT_YUV411P:
202 case PIX_FMT_UYVY411:
206 case PIX_FMT_YUV410P:
207 if(s->codec_id == CODEC_ID_SVQ1){
212 if(s->codec_id == CODEC_ID_RPZA){
217 if(s->codec_id == CODEC_ID_SMC){
223 if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){
234 *width = ALIGN(*width , w_align);
235 *height= ALIGN(*height, h_align);
238 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h){
239 if((int)w>0 && (int)h>0 && (w+128)*(uint64_t)(h+128) < INT_MAX/4)
242 av_log(av_log_ctx, AV_LOG_ERROR, "picture size invalid (%ux%u)\n", w, h);
246 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
253 assert(pic->data[0]==NULL);
254 assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
256 if(avcodec_check_dimensions(s,w,h))
259 if(s->internal_buffer==NULL){
260 s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
263 s->internal_buffer= av_fast_realloc(
265 &s->internal_buffer_size,
266 sizeof(InternalBuffer)*FFMAX(99, s->internal_buffer_count+1)/*FIXME*/
270 buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
271 picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE-1]).last_pic_num; //FIXME ugly hack
275 pic->age= *picture_number - buf->last_pic_num;
276 buf->last_pic_num= *picture_number;
278 int h_chroma_shift, v_chroma_shift;
281 avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
287 case PIX_FMT_UYVY422:
301 avcodec_align_dimensions(s, &w, &h);
303 if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
308 buf->last_pic_num= -256*256*256*64;
311 const int h_shift= i==0 ? 0 : h_chroma_shift;
312 const int v_shift= i==0 ? 0 : v_chroma_shift;
314 //FIXME next ensures that linesize= 2^x uvlinesize, thats needed because some MC code assumes it
315 buf->linesize[i]= ALIGN(pixel_size*w>>h_shift, STRIDE_ALIGN<<(h_chroma_shift-h_shift));
317 buf->base[i]= av_mallocz((buf->linesize[i]*h>>v_shift)+16); //FIXME 16
318 if(buf->base[i]==NULL) return -1;
319 memset(buf->base[i], 128, buf->linesize[i]*h>>v_shift);
321 if(s->flags&CODEC_FLAG_EMU_EDGE)
322 buf->data[i] = buf->base[i];
324 buf->data[i] = buf->base[i] + ALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), STRIDE_ALIGN);
326 pic->age= 256*256*256*64;
328 pic->type= FF_BUFFER_TYPE_INTERNAL;
331 pic->base[i]= buf->base[i];
332 pic->data[i]= buf->data[i];
333 pic->linesize[i]= buf->linesize[i];
335 s->internal_buffer_count++;
340 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
342 InternalBuffer *buf, *last, temp;
344 assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
345 assert(s->internal_buffer_count);
347 buf = NULL; /* avoids warning */
348 for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
349 buf= &((InternalBuffer*)s->internal_buffer)[i];
350 if(buf->data[0] == pic->data[0])
353 assert(i < s->internal_buffer_count);
354 s->internal_buffer_count--;
355 last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
363 // pic->base[i]=NULL;
365 //printf("R%X\n", pic->opaque);
368 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
372 /* If no picture return a new buffer */
373 if(pic->data[0] == NULL) {
374 /* We will copy from buffer, so must be readable */
375 pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
376 return s->get_buffer(s, pic);
379 /* If internal buffer type return the same buffer */
380 if(pic->type == FF_BUFFER_TYPE_INTERNAL)
384 * Not internal type and reget_buffer not overridden, emulate cr buffer
387 for(i = 0; i < 4; i++)
388 pic->data[i] = pic->base[i] = NULL;
390 /* Allocate new frame */
391 if (s->get_buffer(s, pic))
393 /* Copy image data from old buffer to new buffer */
394 img_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,
396 s->release_buffer(s, &temp_pic); // Release old frame
400 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count){
403 for(i=0; i<count; i++){
404 int r= func(c, arg[i]);
410 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt){
414 static const char* context_to_name(void* ptr) {
415 AVCodecContext *avc= ptr;
417 if(avc && avc->codec && avc->codec->name)
418 return avc->codec->name;
423 static AVClass av_codec_context_class = { "AVCodecContext", context_to_name };
425 void avcodec_get_context_defaults(AVCodecContext *s){
426 memset(s, 0, sizeof(AVCodecContext));
428 s->av_class= &av_codec_context_class;
429 s->bit_rate= 800*1000;
430 s->bit_rate_tolerance= s->bit_rate*10;
435 s->rc_eq= "tex^qComp";
438 s->b_quant_factor=1.25;
439 s->b_quant_offset=1.25;
440 s->i_quant_factor=-0.8;
441 s->i_quant_offset=0.0;
442 s->error_concealment= 3;
443 s->error_resilience= 1;
444 s->workaround_bugs= FF_BUG_AUTODETECT;
445 s->frame_rate_base= 1;
448 s->me_method= ME_EPZS;
449 s->get_buffer= avcodec_default_get_buffer;
450 s->release_buffer= avcodec_default_release_buffer;
451 s->get_format= avcodec_default_get_format;
452 s->execute= avcodec_default_execute;
454 s->me_subpel_quality=8;
455 s->lmin= FF_QP2LAMBDA * s->qmin;
456 s->lmax= FF_QP2LAMBDA * s->qmax;
457 s->sample_aspect_ratio= (AVRational){0,1};
458 s->ildct_cmp= FF_CMP_VSAD;
459 s->profile= FF_PROFILE_UNKNOWN;
460 s->level= FF_LEVEL_UNKNOWN;
462 s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
463 s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
465 s->reget_buffer= avcodec_default_reget_buffer;
469 * allocates a AVCodecContext and set it to defaults.
470 * this can be deallocated by simply calling free()
472 AVCodecContext *avcodec_alloc_context(void){
473 AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
475 if(avctx==NULL) return NULL;
477 avcodec_get_context_defaults(avctx);
482 void avcodec_get_frame_defaults(AVFrame *pic){
483 memset(pic, 0, sizeof(AVFrame));
485 pic->pts= AV_NOPTS_VALUE;
489 * allocates a AVPFrame and set it to defaults.
490 * this can be deallocated by simply calling free()
492 AVFrame *avcodec_alloc_frame(void){
493 AVFrame *pic= av_malloc(sizeof(AVFrame));
495 if(pic==NULL) return NULL;
497 avcodec_get_frame_defaults(pic);
502 int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
509 avctx->codec = codec;
510 avctx->codec_id = codec->id;
511 avctx->frame_number = 0;
512 if (codec->priv_data_size > 0) {
513 avctx->priv_data = av_mallocz(codec->priv_data_size);
514 if (!avctx->priv_data)
517 avctx->priv_data = NULL;
520 if(avctx->coded_width && avctx->coded_height)
521 avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
522 else if(avctx->width && avctx->height)
523 avcodec_set_dimensions(avctx, avctx->width, avctx->height);
525 if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height)){
526 av_freep(&avctx->priv_data);
530 ret = avctx->codec->init(avctx);
532 av_freep(&avctx->priv_data);
538 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
539 const short *samples)
541 if(buf_size < FF_MIN_BUFFER_SIZE && 0){
542 av_log(avctx, AV_LOG_ERROR, "buffer smaller then minimum size\n");
545 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
546 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
547 avctx->frame_number++;
553 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
556 if(buf_size < FF_MIN_BUFFER_SIZE){
557 av_log(avctx, AV_LOG_ERROR, "buffer smaller then minimum size\n");
560 if(avcodec_check_dimensions(avctx,avctx->width,avctx->height))
562 if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
563 int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
564 avctx->frame_number++;
565 emms_c(); //needed to avoid a emms_c() call before every return;
574 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
575 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
576 * @param buf_size the size of the buffer in bytes
577 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
578 * @return -1 if error, otherwise return the number of
581 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
582 int *got_picture_ptr,
583 uint8_t *buf, int buf_size)
588 if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height))
590 ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
593 emms_c(); //needed to avoid a emms_c() call before every return;
595 if (*got_picture_ptr)
596 avctx->frame_number++;
600 /* decode an audio frame. return -1 if error, otherwise return the
601 *number of bytes used. If no frame could be decompressed,
602 *frame_size_ptr is zero. Otherwise, it is the decompressed frame
604 int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
606 uint8_t *buf, int buf_size)
611 ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
613 avctx->frame_number++;
617 int avcodec_close(AVCodecContext *avctx)
619 if (avctx->codec->close)
620 avctx->codec->close(avctx);
621 avcodec_default_free_buffers(avctx);
622 av_freep(&avctx->priv_data);
627 AVCodec *avcodec_find_encoder(enum CodecID id)
632 if (p->encode != NULL && p->id == id)
639 AVCodec *avcodec_find_encoder_by_name(const char *name)
644 if (p->encode != NULL && strcmp(name,p->name) == 0)
651 AVCodec *avcodec_find_decoder(enum CodecID id)
656 if (p->decode != NULL && p->id == id)
663 AVCodec *avcodec_find_decoder_by_name(const char *name)
668 if (p->decode != NULL && strcmp(name,p->name) == 0)
675 static AVCodec *avcodec_find(enum CodecID id)
687 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
689 const char *codec_name;
692 char channels_str[100];
696 p = avcodec_find_encoder(enc->codec_id);
698 p = avcodec_find_decoder(enc->codec_id);
701 codec_name = p->name;
702 if (!encode && enc->codec_id == CODEC_ID_MP3) {
703 if (enc->sub_id == 2)
705 else if (enc->sub_id == 1)
708 } else if (enc->codec_id == CODEC_ID_MPEG2TS) {
709 /* fake mpeg2 transport stream codec (currently not
711 codec_name = "mpeg2ts";
712 } else if (enc->codec_name[0] != '\0') {
713 codec_name = enc->codec_name;
715 /* output avi tags */
716 if (enc->codec_type == CODEC_TYPE_VIDEO) {
717 snprintf(buf1, sizeof(buf1), "%c%c%c%c",
718 enc->codec_tag & 0xff,
719 (enc->codec_tag >> 8) & 0xff,
720 (enc->codec_tag >> 16) & 0xff,
721 (enc->codec_tag >> 24) & 0xff);
723 snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
728 switch(enc->codec_type) {
729 case CODEC_TYPE_VIDEO:
730 snprintf(buf, buf_size,
732 codec_name, enc->mb_decision ? " (hq)" : "");
733 if (enc->codec_id == CODEC_ID_RAWVIDEO) {
734 snprintf(buf + strlen(buf), buf_size - strlen(buf),
736 avcodec_get_pix_fmt_name(enc->pix_fmt));
739 snprintf(buf + strlen(buf), buf_size - strlen(buf),
740 ", %dx%d, %0.2f fps",
741 enc->width, enc->height,
742 (float)enc->frame_rate / enc->frame_rate_base);
745 snprintf(buf + strlen(buf), buf_size - strlen(buf),
746 ", q=%d-%d", enc->qmin, enc->qmax);
748 bitrate = enc->bit_rate;
750 case CODEC_TYPE_AUDIO:
751 snprintf(buf, buf_size,
754 switch (enc->channels) {
756 strcpy(channels_str, "mono");
759 strcpy(channels_str, "stereo");
762 strcpy(channels_str, "5:1");
765 snprintf(channels_str, sizeof(channels_str), "%d channels", enc->channels);
768 if (enc->sample_rate) {
769 snprintf(buf + strlen(buf), buf_size - strlen(buf),
775 /* for PCM codecs, compute bitrate directly */
776 switch(enc->codec_id) {
777 case CODEC_ID_PCM_S16LE:
778 case CODEC_ID_PCM_S16BE:
779 case CODEC_ID_PCM_U16LE:
780 case CODEC_ID_PCM_U16BE:
781 bitrate = enc->sample_rate * enc->channels * 16;
783 case CODEC_ID_PCM_S8:
784 case CODEC_ID_PCM_U8:
785 case CODEC_ID_PCM_ALAW:
786 case CODEC_ID_PCM_MULAW:
787 bitrate = enc->sample_rate * enc->channels * 8;
790 bitrate = enc->bit_rate;
794 case CODEC_TYPE_DATA:
795 snprintf(buf, buf_size, "Data: %s", codec_name);
796 bitrate = enc->bit_rate;
799 snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
803 if (enc->flags & CODEC_FLAG_PASS1)
804 snprintf(buf + strlen(buf), buf_size - strlen(buf),
806 if (enc->flags & CODEC_FLAG_PASS2)
807 snprintf(buf + strlen(buf), buf_size - strlen(buf),
811 snprintf(buf + strlen(buf), buf_size - strlen(buf),
812 ", %d kb/s", bitrate / 1000);
816 unsigned avcodec_version( void )
818 return LIBAVCODEC_VERSION_INT;
821 unsigned avcodec_build( void )
823 return LIBAVCODEC_BUILD;
826 /* must be called before any other functions */
827 void avcodec_init(void)
829 static int inited = 0;
835 dsputil_static_init();
839 * Flush buffers, should be called when seeking or when swicthing to a different stream.
841 void avcodec_flush_buffers(AVCodecContext *avctx)
843 if(avctx->codec->flush)
844 avctx->codec->flush(avctx);
847 void avcodec_default_free_buffers(AVCodecContext *s){
850 if(s->internal_buffer==NULL) return;
852 for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
853 InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
855 av_freep(&buf->base[j]);
859 av_freep(&s->internal_buffer);
861 s->internal_buffer_count=0;
864 char av_get_pict_type_char(int pict_type){
866 case I_TYPE: return 'I';
867 case P_TYPE: return 'P';
868 case B_TYPE: return 'B';
869 case S_TYPE: return 'S';
870 case SI_TYPE:return 'i';
871 case SP_TYPE:return 'p';
876 int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
877 AVRational a0={0,1}, a1={1,0};
878 int sign= (nom<0) ^ (den<0);
879 int64_t gcd= ff_gcd(ABS(nom), ABS(den));
883 if(nom<=max && den<=max){
884 a1= (AVRational){nom, den};
889 int64_t x = nom / den;
890 int64_t next_den= nom - den*x;
891 int64_t a2n= x*a1.num + a0.num;
892 int64_t a2d= x*a1.den + a0.den;
894 if(a2n > max || a2d > max) break;
897 a1= (AVRational){a2n, a2d};
901 assert(ff_gcd(a1.num, a1.den) == 1);
903 *dst_nom = sign ? -a1.num : a1.num;
909 int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){
914 assert(rnd >=0 && rnd<=5 && rnd!=4);
916 if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1));
918 if(rnd==AV_ROUND_NEAR_INF) r= c/2;
919 else if(rnd&1) r= c-1;
921 if(b<=INT_MAX && c<=INT_MAX){
923 return (a * b + r)/c;
925 return a/c*b + (a%c*b + r)/c;
928 ai= av_mul_i(av_int2i(a), av_int2i(b));
929 ai= av_add_i(ai, av_int2i(r));
931 return av_i2int(av_div_i(ai, av_int2i(c)));
934 int64_t av_rescale(int64_t a, int64_t b, int64_t c){
935 return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF);
938 int64_t ff_gcd(int64_t a, int64_t b){
939 if(b) return ff_gcd(b, a%b);
945 static int av_log_level = AV_LOG_DEBUG;
947 static void av_log_default_callback(void* ptr, int level, const char* fmt, va_list vl)
949 static int print_prefix=1;
950 AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
951 if(level>av_log_level)
954 if(print_prefix && avc) {
955 fprintf(stderr, "[%s @ %p]", avc->item_name(ptr), avc);
957 #define fprintf please_use_av_log
959 print_prefix= strstr(fmt, "\n") != NULL;
961 vfprintf(stderr, fmt, vl);
964 static void (*av_log_callback)(void*, int, const char*, va_list) = av_log_default_callback;
966 void av_log(void* avcl, int level, const char *fmt, ...)
970 av_vlog(avcl, level, fmt, vl);
974 void av_vlog(void* avcl, int level, const char *fmt, va_list vl)
976 av_log_callback(avcl, level, fmt, vl);
979 int av_log_get_level(void)
984 void av_log_set_level(int level)
986 av_log_level = level;
989 void av_log_set_callback(void (*callback)(void*, int, const char*, va_list))
991 av_log_callback = callback;
994 #if !defined(HAVE_THREADS)
995 int avcodec_thread_init(AVCodecContext *s, int thread_count){