512 lines
13 KiB
C
512 lines
13 KiB
C
/*
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* utils for libavcodec
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* Copyright (c) 2001 Fabrice Bellard.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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void *av_mallocz(unsigned int size)
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{
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void *ptr;
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ptr = av_malloc(size);
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if (!ptr)
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return NULL;
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memset(ptr, 0, size);
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return ptr;
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}
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/* cannot call it directly because of 'void **' casting is not automatic */
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void __av_freep(void **ptr)
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{
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av_free(*ptr);
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*ptr = NULL;
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}
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/* encoder management */
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AVCodec *first_avcodec;
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void register_avcodec(AVCodec *format)
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{
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AVCodec **p;
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p = &first_avcodec;
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while (*p != NULL) p = &(*p)->next;
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*p = format;
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format->next = NULL;
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}
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void avcodec_get_context_defaults(AVCodecContext *s){
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s->bit_rate= 800*1000;
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s->bit_rate_tolerance= s->bit_rate*10;
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s->qmin= 2;
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s->qmax= 31;
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s->rc_eq= "tex^qComp";
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s->qcompress= 0.5;
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s->max_qdiff= 3;
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s->b_quant_factor=1.25;
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s->b_quant_offset=1.25;
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s->i_quant_factor=-0.8;
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s->i_quant_offset=0.0;
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s->error_concealment= 3;
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s->error_resilience= 1;
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s->workaround_bugs= FF_BUG_AUTODETECT;
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s->frame_rate = 25 * FRAME_RATE_BASE;
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s->gop_size= 50;
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s->me_method= ME_EPZS;
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}
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/**
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* allocates a AVCodecContext and set it to defaults.
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* this can be deallocated by simply calling free()
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*/
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AVCodecContext *avcodec_alloc_context(void){
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AVCodecContext *avctx= av_mallocz(sizeof(AVCodecContext));
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if(avctx==NULL) return NULL;
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avcodec_get_context_defaults(avctx);
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return avctx;
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}
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int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
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{
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int ret;
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avctx->codec = codec;
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avctx->frame_number = 0;
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if (codec->priv_data_size > 0) {
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avctx->priv_data = av_mallocz(codec->priv_data_size);
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if (!avctx->priv_data)
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return -ENOMEM;
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} else {
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avctx->priv_data = NULL;
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}
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ret = avctx->codec->init(avctx);
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if (ret < 0) {
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av_freep(&avctx->priv_data);
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return ret;
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}
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return 0;
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}
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int avcodec_encode_audio(AVCodecContext *avctx, UINT8 *buf, int buf_size,
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const short *samples)
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{
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int ret;
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ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
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avctx->frame_number++;
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return ret;
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}
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int avcodec_encode_video(AVCodecContext *avctx, UINT8 *buf, int buf_size,
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const AVPicture *pict)
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{
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int ret;
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ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
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emms_c(); //needed to avoid a emms_c() call before every return;
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avctx->frame_number++;
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return ret;
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}
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/* decode a frame. return -1 if error, otherwise return the number of
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bytes used. If no frame could be decompressed, *got_picture_ptr is
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zero. Otherwise, it is non zero */
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int avcodec_decode_video(AVCodecContext *avctx, AVPicture *picture,
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int *got_picture_ptr,
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UINT8 *buf, int buf_size)
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{
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int ret;
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ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
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buf, buf_size);
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emms_c(); //needed to avoid a emms_c() call before every return;
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if (*got_picture_ptr)
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avctx->frame_number++;
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return ret;
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}
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/* decode an audio frame. return -1 if error, otherwise return the
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*number of bytes used. If no frame could be decompressed,
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*frame_size_ptr is zero. Otherwise, it is the decompressed frame
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*size in BYTES. */
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int avcodec_decode_audio(AVCodecContext *avctx, INT16 *samples,
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int *frame_size_ptr,
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UINT8 *buf, int buf_size)
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{
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int ret;
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ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
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buf, buf_size);
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avctx->frame_number++;
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return ret;
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}
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int avcodec_close(AVCodecContext *avctx)
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{
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if (avctx->codec->close)
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avctx->codec->close(avctx);
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av_freep(&avctx->priv_data);
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avctx->codec = NULL;
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return 0;
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}
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AVCodec *avcodec_find_encoder(enum CodecID id)
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{
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AVCodec *p;
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p = first_avcodec;
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while (p) {
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if (p->encode != NULL && p->id == id)
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return p;
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p = p->next;
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}
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return NULL;
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}
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AVCodec *avcodec_find_encoder_by_name(const char *name)
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{
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AVCodec *p;
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p = first_avcodec;
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while (p) {
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if (p->encode != NULL && strcmp(name,p->name) == 0)
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return p;
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p = p->next;
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}
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return NULL;
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}
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AVCodec *avcodec_find_decoder(enum CodecID id)
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{
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AVCodec *p;
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p = first_avcodec;
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while (p) {
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if (p->decode != NULL && p->id == id)
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return p;
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p = p->next;
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}
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return NULL;
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}
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AVCodec *avcodec_find_decoder_by_name(const char *name)
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{
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AVCodec *p;
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p = first_avcodec;
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while (p) {
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if (p->decode != NULL && strcmp(name,p->name) == 0)
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return p;
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p = p->next;
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}
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return NULL;
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}
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AVCodec *avcodec_find(enum CodecID id)
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{
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AVCodec *p;
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p = first_avcodec;
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while (p) {
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if (p->id == id)
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return p;
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p = p->next;
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}
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return NULL;
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}
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const char *pix_fmt_str[] = {
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"yuv420p",
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"yuv422",
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"rgb24",
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"bgr24",
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"yuv422p",
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"yuv444p",
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"rgba32",
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"bgra32",
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"yuv410p",
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"yuv411p",
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};
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void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
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{
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const char *codec_name;
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AVCodec *p;
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char buf1[32];
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char channels_str[100];
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int bitrate;
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if (encode)
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p = avcodec_find_encoder(enc->codec_id);
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else
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p = avcodec_find_decoder(enc->codec_id);
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if (p) {
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codec_name = p->name;
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} else if (enc->codec_name[0] != '\0') {
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codec_name = enc->codec_name;
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} else {
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/* output avi tags */
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if (enc->codec_type == CODEC_TYPE_VIDEO) {
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snprintf(buf1, sizeof(buf1), "%c%c%c%c",
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enc->codec_tag & 0xff,
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(enc->codec_tag >> 8) & 0xff,
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(enc->codec_tag >> 16) & 0xff,
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(enc->codec_tag >> 24) & 0xff);
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} else {
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snprintf(buf1, sizeof(buf1), "0x%04x", enc->codec_tag);
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}
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codec_name = buf1;
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}
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switch(enc->codec_type) {
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case CODEC_TYPE_VIDEO:
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snprintf(buf, buf_size,
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"Video: %s%s",
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codec_name, enc->flags & CODEC_FLAG_HQ ? " (hq)" : "");
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if (enc->codec_id == CODEC_ID_RAWVIDEO) {
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snprintf(buf + strlen(buf), buf_size - strlen(buf),
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", %s",
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pix_fmt_str[enc->pix_fmt]);
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}
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if (enc->width) {
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snprintf(buf + strlen(buf), buf_size - strlen(buf),
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", %dx%d, %0.2f fps",
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enc->width, enc->height,
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(float)enc->frame_rate / FRAME_RATE_BASE);
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}
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if (encode) {
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snprintf(buf + strlen(buf), buf_size - strlen(buf),
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", q=%d-%d", enc->qmin, enc->qmax);
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}
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bitrate = enc->bit_rate;
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break;
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case CODEC_TYPE_AUDIO:
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snprintf(buf, buf_size,
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"Audio: %s",
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codec_name);
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switch (enc->channels) {
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case 1:
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strcpy(channels_str, "mono");
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break;
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case 2:
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strcpy(channels_str, "stereo");
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break;
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case 6:
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strcpy(channels_str, "5:1");
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break;
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default:
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sprintf(channels_str, "%d channels", enc->channels);
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break;
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}
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if (enc->sample_rate) {
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snprintf(buf + strlen(buf), buf_size - strlen(buf),
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", %d Hz, %s",
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enc->sample_rate,
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channels_str);
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}
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/* for PCM codecs, compute bitrate directly */
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switch(enc->codec_id) {
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case CODEC_ID_PCM_S16LE:
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case CODEC_ID_PCM_S16BE:
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case CODEC_ID_PCM_U16LE:
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case CODEC_ID_PCM_U16BE:
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bitrate = enc->sample_rate * enc->channels * 16;
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break;
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case CODEC_ID_PCM_S8:
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case CODEC_ID_PCM_U8:
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case CODEC_ID_PCM_ALAW:
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case CODEC_ID_PCM_MULAW:
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bitrate = enc->sample_rate * enc->channels * 8;
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break;
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default:
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bitrate = enc->bit_rate;
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break;
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}
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break;
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default:
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av_abort();
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}
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if (encode) {
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if (enc->flags & CODEC_FLAG_PASS1)
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snprintf(buf + strlen(buf), buf_size - strlen(buf),
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", pass 1");
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if (enc->flags & CODEC_FLAG_PASS2)
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snprintf(buf + strlen(buf), buf_size - strlen(buf),
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", pass 2");
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}
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if (bitrate != 0) {
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snprintf(buf + strlen(buf), buf_size - strlen(buf),
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", %d kb/s", bitrate / 1000);
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}
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}
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/* Picture field are filled with 'ptr' addresses */
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void avpicture_fill(AVPicture *picture, UINT8 *ptr,
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int pix_fmt, int width, int height)
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{
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int size;
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size = width * height;
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switch(pix_fmt) {
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case PIX_FMT_YUV420P:
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picture->data[0] = ptr;
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picture->data[1] = picture->data[0] + size;
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picture->data[2] = picture->data[1] + size / 4;
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picture->linesize[0] = width;
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picture->linesize[1] = width / 2;
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picture->linesize[2] = width / 2;
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break;
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case PIX_FMT_YUV422P:
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picture->data[0] = ptr;
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picture->data[1] = picture->data[0] + size;
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picture->data[2] = picture->data[1] + size / 2;
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picture->linesize[0] = width;
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picture->linesize[1] = width / 2;
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picture->linesize[2] = width / 2;
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break;
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case PIX_FMT_YUV444P:
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picture->data[0] = ptr;
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picture->data[1] = picture->data[0] + size;
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picture->data[2] = picture->data[1] + size;
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picture->linesize[0] = width;
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picture->linesize[1] = width;
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picture->linesize[2] = width;
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break;
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case PIX_FMT_RGB24:
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case PIX_FMT_BGR24:
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picture->data[0] = ptr;
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picture->data[1] = NULL;
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picture->data[2] = NULL;
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picture->linesize[0] = width * 3;
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break;
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case PIX_FMT_RGBA32:
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case PIX_FMT_BGRA32:
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picture->data[0] = ptr;
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picture->data[1] = NULL;
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picture->data[2] = NULL;
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picture->linesize[0] = width * 4;
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break;
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case PIX_FMT_YUV422:
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picture->data[0] = ptr;
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picture->data[1] = NULL;
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picture->data[2] = NULL;
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picture->linesize[0] = width * 2;
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break;
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default:
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picture->data[0] = NULL;
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picture->data[1] = NULL;
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picture->data[2] = NULL;
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break;
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}
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}
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int avpicture_get_size(int pix_fmt, int width, int height)
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{
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int size;
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size = width * height;
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switch(pix_fmt) {
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case PIX_FMT_YUV420P:
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size = (size * 3) / 2;
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break;
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case PIX_FMT_YUV422P:
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size = (size * 2);
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break;
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case PIX_FMT_YUV444P:
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size = (size * 3);
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break;
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case PIX_FMT_RGB24:
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case PIX_FMT_BGR24:
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size = (size * 3);
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break;
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case PIX_FMT_RGBA32:
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case PIX_FMT_BGRA32:
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size = (size * 4);
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break;
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case PIX_FMT_YUV422:
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size = (size * 2);
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break;
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default:
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size = -1;
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break;
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}
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return size;
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}
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unsigned avcodec_version( void )
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{
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return LIBAVCODEC_VERSION_INT;
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}
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unsigned avcodec_build( void )
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{
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return LIBAVCODEC_BUILD;
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}
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/* must be called before any other functions */
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void avcodec_init(void)
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{
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static int inited = 0;
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if (inited != 0)
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return;
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inited = 1;
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//dsputil_init();
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}
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/* this should be called after seeking and before trying to decode the next frame */
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void avcodec_flush_buffers(AVCodecContext *avctx)
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{
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MpegEncContext *s = avctx->priv_data;
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s->num_available_buffers=0;
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}
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static int raw_encode_init(AVCodecContext *s)
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{
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return 0;
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}
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static int raw_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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UINT8 *buf, int buf_size)
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{
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return -1;
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}
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static int raw_encode_frame(AVCodecContext *avctx,
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unsigned char *frame, int buf_size, void *data)
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{
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return -1;
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}
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AVCodec rawvideo_codec = {
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"rawvideo",
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CODEC_TYPE_VIDEO,
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CODEC_ID_RAWVIDEO,
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0,
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raw_encode_init,
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raw_encode_frame,
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NULL,
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raw_decode_frame,
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};
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