3 * Copyright (c) 2001 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #include "mpegvideo.h"
29 void *av_mallocz(unsigned int size)
33 ptr = av_malloc(size);
40 char *av_strdup(const char *s)
53 * realloc which does nothing if the block is large enough
55 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size)
60 *size= min_size + 10*1024;
62 return av_realloc(ptr, *size);
66 /* allocation of static arrays - do not use for normal allocation */
67 static unsigned int last_static = 0;
68 static char*** array_static = NULL;
69 static const unsigned int grow_static = 64; // ^2
70 void *__av_mallocz_static(void** location, unsigned int size)
72 unsigned int l = (last_static + grow_static) & ~(grow_static - 1);
73 void *ptr = av_mallocz(size);
80 array_static = av_realloc(array_static, l);
81 array_static[last_static++] = (char**) location;
86 /* free all static arrays and reset pointers to 0 */
87 void av_free_static(void)
92 for (i = 0; i < last_static; i++)
94 av_free(*array_static[i]);
95 *array_static[i] = NULL;
97 av_free(array_static);
103 /* cannot call it directly because of 'void **' casting is not automatic */
104 void __av_freep(void **ptr)
110 /* encoder management */
111 AVCodec *first_avcodec;
113 void register_avcodec(AVCodec *format)
117 while (*p != NULL) p = &(*p)->next;
122 typedef struct InternalBuffer{
128 #define INTERNAL_BUFFER_SIZE 32
130 #define ALIGN(x, a) (((x)+(a)-1)&~((a)-1))
132 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){
137 case PIX_FMT_YUV420P:
139 case PIX_FMT_YUV422P:
140 case PIX_FMT_YUV444P:
142 case PIX_FMT_YUVJ420P:
143 case PIX_FMT_YUVJ422P:
144 case PIX_FMT_YUVJ444P:
145 w_align= 16; //FIXME check for non mpeg style codecs and use less alignment
148 case PIX_FMT_YUV411P:
152 case PIX_FMT_YUV410P:
153 if(s->codec_id == CODEC_ID_SVQ1){
164 *width = ALIGN(*width , w_align);
165 *height= ALIGN(*height, h_align);
168 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
174 assert(pic->data[0]==NULL);
175 assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
177 if(s->internal_buffer==NULL){
178 s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
181 s->internal_buffer= av_fast_realloc(
183 &s->internal_buffer_size,
184 sizeof(InternalBuffer)*FFMAX(99, s->internal_buffer_count+1)/*FIXME*/
188 buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
191 pic->age= pic->coded_picture_number - buf->last_pic_num;
192 buf->last_pic_num= pic->coded_picture_number;
194 int h_chroma_shift, v_chroma_shift;
195 int s_align, pixel_size;
197 avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
216 avcodec_align_dimensions(s, &w, &h);
217 #if defined(ARCH_POWERPC) || defined(HAVE_MMI) //FIXME some cleaner check
223 if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
228 buf->last_pic_num= -256*256*256*64;
231 const int h_shift= i==0 ? 0 : h_chroma_shift;
232 const int v_shift= i==0 ? 0 : v_chroma_shift;
234 pic->linesize[i]= ALIGN(pixel_size*w>>h_shift, s_align);
236 buf->base[i]= av_mallocz((pic->linesize[i]*h>>v_shift)+16); //FIXME 16
237 if(buf->base[i]==NULL) return -1;
238 memset(buf->base[i], 128, pic->linesize[i]*h>>v_shift);
240 if(s->flags&CODEC_FLAG_EMU_EDGE)
241 buf->data[i] = buf->base[i];
243 buf->data[i] = buf->base[i] + (pic->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift);
245 pic->age= 256*256*256*64;
246 pic->type= FF_BUFFER_TYPE_INTERNAL;
250 pic->base[i]= buf->base[i];
251 pic->data[i]= buf->data[i];
253 s->internal_buffer_count++;
258 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
260 InternalBuffer *buf, *last, temp;
262 assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
263 assert(s->internal_buffer_count);
265 buf = NULL; /* avoids warning */
266 for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
267 buf= &((InternalBuffer*)s->internal_buffer)[i];
268 if(buf->data[0] == pic->data[0])
271 assert(i < s->internal_buffer_count);
272 s->internal_buffer_count--;
273 last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
281 // pic->base[i]=NULL;
283 //printf("R%X\n", pic->opaque);
286 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, enum PixelFormat * fmt){
290 void avcodec_get_context_defaults(AVCodecContext *s){
291 s->bit_rate= 800*1000;
292 s->bit_rate_tolerance= s->bit_rate*10;
297 s->rc_eq= "tex^qComp";
300 s->b_quant_factor=1.25;
301 s->b_quant_offset=1.25;
302 s->i_quant_factor=-0.8;
303 s->i_quant_offset=0.0;
304 s->error_concealment= 3;
305 s->error_resilience= 1;
306 s->workaround_bugs= FF_BUG_AUTODETECT;
307 s->frame_rate_base= 1;
310 s->me_method= ME_EPZS;
311 s->get_buffer= avcodec_default_get_buffer;
312 s->release_buffer= avcodec_default_release_buffer;
313 s->get_format= avcodec_default_get_format;
314 s->me_subpel_quality=8;
315 s->lmin= FF_QP2LAMBDA * s->qmin;
316 s->lmax= FF_QP2LAMBDA * s->qmax;
318 s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
319 s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
323 * allocates a AVCodecContext and set it to defaults.
324 * this can be deallocated by simply calling free()
326 AVCodecContext *avcodec_alloc_context(void){
327 AVCodecContext *avctx= av_mallocz(sizeof(AVCodecContext));
329 if(avctx==NULL) return NULL;
331 avcodec_get_context_defaults(avctx);
337 * allocates a AVPFrame and set it to defaults.
338 * this can be deallocated by simply calling free()
340 AVFrame *avcodec_alloc_frame(void){
341 AVFrame *pic= av_mallocz(sizeof(AVFrame));
346 int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
353 avctx->codec = codec;
354 avctx->codec_id = codec->id;
355 avctx->frame_number = 0;
356 if (codec->priv_data_size > 0) {
357 avctx->priv_data = av_mallocz(codec->priv_data_size);
358 if (!avctx->priv_data)
361 avctx->priv_data = NULL;
363 ret = avctx->codec->init(avctx);
365 av_freep(&avctx->priv_data);
371 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
372 const short *samples)
376 ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
377 avctx->frame_number++;
381 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
386 ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
388 emms_c(); //needed to avoid a emms_c() call before every return;
390 avctx->frame_number++;
396 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
397 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
398 * @param buf_size the size of the buffer in bytes
399 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
400 * @return -1 if error, otherwise return the number of
403 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
404 int *got_picture_ptr,
405 uint8_t *buf, int buf_size)
409 ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
412 emms_c(); //needed to avoid a emms_c() call before every return;
414 if (*got_picture_ptr)
415 avctx->frame_number++;
419 /* decode an audio frame. return -1 if error, otherwise return the
420 *number of bytes used. If no frame could be decompressed,
421 *frame_size_ptr is zero. Otherwise, it is the decompressed frame
423 int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
425 uint8_t *buf, int buf_size)
429 ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
431 avctx->frame_number++;
435 int avcodec_close(AVCodecContext *avctx)
437 if (avctx->codec->close)
438 avctx->codec->close(avctx);
439 av_freep(&avctx->priv_data);
444 AVCodec *avcodec_find_encoder(enum CodecID id)
449 if (p->encode != NULL && p->id == id)
456 AVCodec *avcodec_find_encoder_by_name(const char *name)
461 if (p->encode != NULL && strcmp(name,p->name) == 0)
468 AVCodec *avcodec_find_decoder(enum CodecID id)
473 if (p->decode != NULL && p->id == id)
480 AVCodec *avcodec_find_decoder_by_name(const char *name)
485 if (p->decode != NULL && strcmp(name,p->name) == 0)
492 AVCodec *avcodec_find(enum CodecID id)
504 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
506 const char *codec_name;
509 char channels_str[100];
513 p = avcodec_find_encoder(enc->codec_id);
515 p = avcodec_find_decoder(enc->codec_id);
518 codec_name = p->name;
519 if (!encode && enc->codec_id == CODEC_ID_MP3) {
520 if (enc->sub_id == 2)
522 else if (enc->sub_id == 1)
525 } else if (enc->codec_name[0] != '\0') {
526 codec_name = enc->codec_name;
528 /* output avi tags */
529 if (enc->codec_type == CODEC_TYPE_VIDEO) {
530 snprintf(buf1, sizeof(buf1), "%c%c%c%c",
531 enc->codec_tag & 0xff,
532 (enc->codec_tag >> 8) & 0xff,
533 (enc->codec_tag >> 16) & 0xff,
534 (enc->codec_tag >> 24) & 0xff);
536 snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
541 switch(enc->codec_type) {
542 case CODEC_TYPE_VIDEO:
543 snprintf(buf, buf_size,
545 codec_name, enc->mb_decision ? " (hq)" : "");
546 if (enc->codec_id == CODEC_ID_RAWVIDEO) {
547 snprintf(buf + strlen(buf), buf_size - strlen(buf),
549 avcodec_get_pix_fmt_name(enc->pix_fmt));
552 snprintf(buf + strlen(buf), buf_size - strlen(buf),
553 ", %dx%d, %0.2f fps",
554 enc->width, enc->height,
555 (float)enc->frame_rate / enc->frame_rate_base);
558 snprintf(buf + strlen(buf), buf_size - strlen(buf),
559 ", q=%d-%d", enc->qmin, enc->qmax);
561 bitrate = enc->bit_rate;
563 case CODEC_TYPE_AUDIO:
564 snprintf(buf, buf_size,
567 switch (enc->channels) {
569 strcpy(channels_str, "mono");
572 strcpy(channels_str, "stereo");
575 strcpy(channels_str, "5:1");
578 sprintf(channels_str, "%d channels", enc->channels);
581 if (enc->sample_rate) {
582 snprintf(buf + strlen(buf), buf_size - strlen(buf),
588 /* for PCM codecs, compute bitrate directly */
589 switch(enc->codec_id) {
590 case CODEC_ID_PCM_S16LE:
591 case CODEC_ID_PCM_S16BE:
592 case CODEC_ID_PCM_U16LE:
593 case CODEC_ID_PCM_U16BE:
594 bitrate = enc->sample_rate * enc->channels * 16;
596 case CODEC_ID_PCM_S8:
597 case CODEC_ID_PCM_U8:
598 case CODEC_ID_PCM_ALAW:
599 case CODEC_ID_PCM_MULAW:
600 bitrate = enc->sample_rate * enc->channels * 8;
603 bitrate = enc->bit_rate;
611 if (enc->flags & CODEC_FLAG_PASS1)
612 snprintf(buf + strlen(buf), buf_size - strlen(buf),
614 if (enc->flags & CODEC_FLAG_PASS2)
615 snprintf(buf + strlen(buf), buf_size - strlen(buf),
619 snprintf(buf + strlen(buf), buf_size - strlen(buf),
620 ", %d kb/s", bitrate / 1000);
624 unsigned avcodec_version( void )
626 return LIBAVCODEC_VERSION_INT;
629 unsigned avcodec_build( void )
631 return LIBAVCODEC_BUILD;
634 /* must be called before any other functions */
635 void avcodec_init(void)
637 static int inited = 0;
643 dsputil_static_init();
647 * Flush buffers, should be called when seeking or when swicthing to a different stream.
649 void avcodec_flush_buffers(AVCodecContext *avctx)
651 if(avctx->codec->flush)
652 avctx->codec->flush(avctx);
655 void avcodec_default_free_buffers(AVCodecContext *s){
658 if(s->internal_buffer==NULL) return;
660 for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
661 InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
663 av_freep(&buf->base[j]);
667 av_freep(&s->internal_buffer);
669 s->internal_buffer_count=0;
672 char av_get_pict_type_char(int pict_type){
674 case I_TYPE: return 'I';
675 case P_TYPE: return 'P';
676 case B_TYPE: return 'B';
677 case S_TYPE: return 'S';
678 case SI_TYPE:return 'i';
679 case SP_TYPE:return 'p';
684 int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
700 for(;;){ //note is executed 1 or 2 times
701 gcd = ff_gcd(nom, den);
705 larger= FFMAX(nom, den);
708 int64_t div= (larger + max - 1) / max;
709 nom = (nom + div/2)/div;
710 den = (den + div/2)/div;
724 int64_t av_rescale(int64_t a, int b, int c){
729 if(a<0) return -av_rescale(-a, b, c);
732 if(h==0) return a*b/c;
740 return ((h/c)<<32) + l/c;