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 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){
132 const int width = s->width;
133 const int height= s->height;
136 assert(pic->data[0]==NULL);
137 assert(INTERNAL_BUFFER_SIZE > s->internal_buffer_count);
139 if(s->internal_buffer==NULL){
140 s->internal_buffer= av_mallocz(INTERNAL_BUFFER_SIZE*sizeof(InternalBuffer));
143 s->internal_buffer= av_fast_realloc(
145 &s->internal_buffer_size,
146 sizeof(InternalBuffer)*FFMAX(99, s->internal_buffer_count+1)/*FIXME*/
150 buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
153 pic->age= pic->coded_picture_number - buf->last_pic_num;
154 buf->last_pic_num= pic->coded_picture_number;
156 int align, h_chroma_shift, v_chroma_shift;
157 int w, h, pixel_size;
159 avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);
177 if(s->codec_id==CODEC_ID_SVQ1) align=63;
180 w= (width +align)&~align;
181 h= (height+align)&~align;
183 if(!(s->flags&CODEC_FLAG_EMU_EDGE)){
188 buf->last_pic_num= -256*256*256*64;
191 const int h_shift= i==0 ? 0 : h_chroma_shift;
192 const int v_shift= i==0 ? 0 : v_chroma_shift;
194 pic->linesize[i]= pixel_size*w>>h_shift;
196 buf->base[i]= av_mallocz((pic->linesize[i]*h>>v_shift)+16); //FIXME 16
197 if(buf->base[i]==NULL) return -1;
198 memset(buf->base[i], 128, pic->linesize[i]*h>>v_shift);
200 if(s->flags&CODEC_FLAG_EMU_EDGE)
201 buf->data[i] = buf->base[i];
203 buf->data[i] = buf->base[i] + (pic->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift);
205 pic->age= 256*256*256*64;
206 pic->type= FF_BUFFER_TYPE_INTERNAL;
210 pic->base[i]= buf->base[i];
211 pic->data[i]= buf->data[i];
213 s->internal_buffer_count++;
218 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
220 InternalBuffer *buf, *last, temp;
222 assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
223 assert(s->internal_buffer_count);
225 buf = NULL; /* avoids warning */
226 for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize
227 buf= &((InternalBuffer*)s->internal_buffer)[i];
228 if(buf->data[0] == pic->data[0])
231 assert(i < s->internal_buffer_count);
232 s->internal_buffer_count--;
233 last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];
241 // pic->base[i]=NULL;
243 //printf("R%X\n", pic->opaque);
246 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, enum PixelFormat * fmt){
250 void avcodec_get_context_defaults(AVCodecContext *s){
251 s->bit_rate= 800*1000;
252 s->bit_rate_tolerance= s->bit_rate*10;
257 s->rc_eq= "tex^qComp";
260 s->b_quant_factor=1.25;
261 s->b_quant_offset=1.25;
262 s->i_quant_factor=-0.8;
263 s->i_quant_offset=0.0;
264 s->error_concealment= 3;
265 s->error_resilience= 1;
266 s->workaround_bugs= FF_BUG_AUTODETECT;
267 s->frame_rate_base= 1;
270 s->me_method= ME_EPZS;
271 s->get_buffer= avcodec_default_get_buffer;
272 s->release_buffer= avcodec_default_release_buffer;
273 s->get_format= avcodec_default_get_format;
274 s->me_subpel_quality=8;
276 s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
277 s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;
281 * allocates a AVCodecContext and set it to defaults.
282 * this can be deallocated by simply calling free()
284 AVCodecContext *avcodec_alloc_context(void){
285 AVCodecContext *avctx= av_mallocz(sizeof(AVCodecContext));
287 if(avctx==NULL) return NULL;
289 avcodec_get_context_defaults(avctx);
295 * allocates a AVPFrame and set it to defaults.
296 * this can be deallocated by simply calling free()
298 AVFrame *avcodec_alloc_frame(void){
299 AVFrame *pic= av_mallocz(sizeof(AVFrame));
304 int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
311 avctx->codec = codec;
312 avctx->codec_id = codec->id;
313 avctx->frame_number = 0;
314 if (codec->priv_data_size > 0) {
315 avctx->priv_data = av_mallocz(codec->priv_data_size);
316 if (!avctx->priv_data)
319 avctx->priv_data = NULL;
321 ret = avctx->codec->init(avctx);
323 av_freep(&avctx->priv_data);
329 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
330 const short *samples)
334 ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
335 avctx->frame_number++;
339 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
344 ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
346 emms_c(); //needed to avoid a emms_c() call before every return;
348 avctx->frame_number++;
354 * @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
355 * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end
356 * @param buf_size the size of the buffer in bytes
357 * @param got_picture_ptr zero if no frame could be decompressed, Otherwise, it is non zero
358 * @return -1 if error, otherwise return the number of
361 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
362 int *got_picture_ptr,
363 uint8_t *buf, int buf_size)
367 ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
370 emms_c(); //needed to avoid a emms_c() call before every return;
372 if (*got_picture_ptr)
373 avctx->frame_number++;
377 /* decode an audio frame. return -1 if error, otherwise return the
378 *number of bytes used. If no frame could be decompressed,
379 *frame_size_ptr is zero. Otherwise, it is the decompressed frame
381 int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
383 uint8_t *buf, int buf_size)
387 ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
389 avctx->frame_number++;
393 int avcodec_close(AVCodecContext *avctx)
395 if (avctx->codec->close)
396 avctx->codec->close(avctx);
397 av_freep(&avctx->priv_data);
402 AVCodec *avcodec_find_encoder(enum CodecID id)
407 if (p->encode != NULL && p->id == id)
414 AVCodec *avcodec_find_encoder_by_name(const char *name)
419 if (p->encode != NULL && strcmp(name,p->name) == 0)
426 AVCodec *avcodec_find_decoder(enum CodecID id)
431 if (p->decode != NULL && p->id == id)
438 AVCodec *avcodec_find_decoder_by_name(const char *name)
443 if (p->decode != NULL && strcmp(name,p->name) == 0)
450 AVCodec *avcodec_find(enum CodecID id)
462 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
464 const char *codec_name;
467 char channels_str[100];
471 p = avcodec_find_encoder(enc->codec_id);
473 p = avcodec_find_decoder(enc->codec_id);
476 codec_name = p->name;
477 if (!encode && enc->codec_id == CODEC_ID_MP3) {
478 if (enc->sub_id == 2)
480 else if (enc->sub_id == 1)
483 } else if (enc->codec_name[0] != '\0') {
484 codec_name = enc->codec_name;
486 /* output avi tags */
487 if (enc->codec_type == CODEC_TYPE_VIDEO) {
488 snprintf(buf1, sizeof(buf1), "%c%c%c%c",
489 enc->codec_tag & 0xff,
490 (enc->codec_tag >> 8) & 0xff,
491 (enc->codec_tag >> 16) & 0xff,
492 (enc->codec_tag >> 24) & 0xff);
494 snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
499 switch(enc->codec_type) {
500 case CODEC_TYPE_VIDEO:
501 snprintf(buf, buf_size,
503 codec_name, enc->mb_decision ? " (hq)" : "");
504 if (enc->codec_id == CODEC_ID_RAWVIDEO) {
505 snprintf(buf + strlen(buf), buf_size - strlen(buf),
507 avcodec_get_pix_fmt_name(enc->pix_fmt));
510 snprintf(buf + strlen(buf), buf_size - strlen(buf),
511 ", %dx%d, %0.2f fps",
512 enc->width, enc->height,
513 (float)enc->frame_rate / enc->frame_rate_base);
516 snprintf(buf + strlen(buf), buf_size - strlen(buf),
517 ", q=%d-%d", enc->qmin, enc->qmax);
519 bitrate = enc->bit_rate;
521 case CODEC_TYPE_AUDIO:
522 snprintf(buf, buf_size,
525 switch (enc->channels) {
527 strcpy(channels_str, "mono");
530 strcpy(channels_str, "stereo");
533 strcpy(channels_str, "5:1");
536 sprintf(channels_str, "%d channels", enc->channels);
539 if (enc->sample_rate) {
540 snprintf(buf + strlen(buf), buf_size - strlen(buf),
546 /* for PCM codecs, compute bitrate directly */
547 switch(enc->codec_id) {
548 case CODEC_ID_PCM_S16LE:
549 case CODEC_ID_PCM_S16BE:
550 case CODEC_ID_PCM_U16LE:
551 case CODEC_ID_PCM_U16BE:
552 bitrate = enc->sample_rate * enc->channels * 16;
554 case CODEC_ID_PCM_S8:
555 case CODEC_ID_PCM_U8:
556 case CODEC_ID_PCM_ALAW:
557 case CODEC_ID_PCM_MULAW:
558 bitrate = enc->sample_rate * enc->channels * 8;
561 bitrate = enc->bit_rate;
569 if (enc->flags & CODEC_FLAG_PASS1)
570 snprintf(buf + strlen(buf), buf_size - strlen(buf),
572 if (enc->flags & CODEC_FLAG_PASS2)
573 snprintf(buf + strlen(buf), buf_size - strlen(buf),
577 snprintf(buf + strlen(buf), buf_size - strlen(buf),
578 ", %d kb/s", bitrate / 1000);
582 unsigned avcodec_version( void )
584 return LIBAVCODEC_VERSION_INT;
587 unsigned avcodec_build( void )
589 return LIBAVCODEC_BUILD;
592 /* must be called before any other functions */
593 void avcodec_init(void)
595 static int inited = 0;
601 dsputil_static_init();
605 * Flush buffers, should be called when seeking or when swicthing to a different stream.
607 void avcodec_flush_buffers(AVCodecContext *avctx)
609 if(avctx->codec->flush)
610 avctx->codec->flush(avctx);
613 void avcodec_default_free_buffers(AVCodecContext *s){
616 if(s->internal_buffer==NULL) return;
618 for(i=0; i<INTERNAL_BUFFER_SIZE; i++){
619 InternalBuffer *buf= &((InternalBuffer*)s->internal_buffer)[i];
621 av_freep(&buf->base[j]);
625 av_freep(&s->internal_buffer);
627 s->internal_buffer_count=0;
630 char av_get_pict_type_char(int pict_type){
632 case I_TYPE: return 'I';
633 case P_TYPE: return 'P';
634 case B_TYPE: return 'B';
635 case S_TYPE: return 'S';
636 case SI_TYPE:return 'i';
637 case SP_TYPE:return 'p';
642 int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
658 for(;;){ //note is executed 1 or 2 times
659 gcd = ff_gcd(nom, den);
663 larger= FFMAX(nom, den);
666 int64_t div= (larger + max - 1) / max;
667 nom = (nom + div/2)/div;
668 den = (den + div/2)/div;
682 int64_t av_rescale(int64_t a, int b, int c){
687 if(a<0) return -av_rescale(-a, b, c);
690 if(h==0) return a*b/c;
698 return ((h/c)<<32) + l/c;