2006-09-10 14:02:42 +00:00
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/*
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* copyright (c) 2001 Fabrice Bellard
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*
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2011-03-18 17:35:10 +00:00
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* This file is part of Libav.
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2006-10-07 15:30:46 +00:00
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*
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2011-03-18 17:35:10 +00:00
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* Libav is free software; you can redistribute it and/or
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2006-09-10 14:02:42 +00:00
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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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2006-10-07 15:30:46 +00:00
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* version 2.1 of the License, or (at your option) any later version.
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2006-09-10 14:02:42 +00:00
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*
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2011-03-18 17:35:10 +00:00
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* Libav is distributed in the hope that it will be useful,
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2006-09-10 14:02:42 +00:00
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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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2011-03-18 17:35:10 +00:00
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* License along with Libav; if not, write to the Free Software
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2006-09-10 14:02:42 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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2003-03-06 11:32:04 +00:00
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/**
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2010-04-20 14:45:34 +00:00
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* @file
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2011-06-30 19:06:25 +00:00
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* libavcodec API use example.
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2001-07-22 14:18:56 +00:00
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*
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2011-06-30 19:06:25 +00:00
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* @example libavcodec/api-example.c
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2001-07-22 14:18:56 +00:00
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* Note that this library only handles codecs (mpeg, mpeg4, etc...),
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2003-08-28 13:30:03 +00:00
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* not file formats (avi, vob, etc...). See library 'libavformat' for the
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2005-12-17 18:14:38 +00:00
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* format handling
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2001-07-22 14:18:56 +00:00
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*/
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2003-03-06 11:32:04 +00:00
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2001-07-22 14:18:56 +00:00
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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2007-02-18 21:23:50 +00:00
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2003-02-10 09:40:23 +00:00
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#ifdef HAVE_AV_CONFIG_H
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#undef HAVE_AV_CONFIG_H
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#endif
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2009-10-06 06:18:57 +00:00
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#include "libavcodec/avcodec.h"
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2012-11-10 15:00:00 +00:00
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#include "libavutil/channel_layout.h"
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2012-08-06 13:49:32 +00:00
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#include "libavutil/common.h"
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2012-07-31 14:35:18 +00:00
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#include "libavutil/imgutils.h"
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2008-10-02 16:29:15 +00:00
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#include "libavutil/mathematics.h"
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2011-11-11 20:44:41 +00:00
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#include "libavutil/samplefmt.h"
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2001-07-22 14:18:56 +00:00
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#define INBUF_SIZE 4096
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2010-05-25 19:13:28 +00:00
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#define AUDIO_INBUF_SIZE 20480
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#define AUDIO_REFILL_THRESH 4096
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2001-07-22 14:18:56 +00:00
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2012-07-31 13:32:02 +00:00
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/* check that a given sample format is supported by the encoder */
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static int check_sample_fmt(AVCodec *codec, enum AVSampleFormat sample_fmt)
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{
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const enum AVSampleFormat *p = codec->sample_fmts;
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while (*p != AV_SAMPLE_FMT_NONE) {
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if (*p == sample_fmt)
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return 1;
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p++;
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}
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return 0;
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}
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/* just pick the highest supported samplerate */
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static int select_sample_rate(AVCodec *codec)
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{
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const int *p;
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int best_samplerate = 0;
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if (!codec->supported_samplerates)
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return 44100;
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p = codec->supported_samplerates;
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while (*p) {
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best_samplerate = FFMAX(*p, best_samplerate);
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p++;
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}
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return best_samplerate;
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}
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/* select layout with the highest channel count */
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static int select_channel_layout(AVCodec *codec)
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{
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const uint64_t *p;
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uint64_t best_ch_layout = 0;
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2013-04-03 12:33:58 +00:00
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int best_nb_channels = 0;
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2012-07-31 13:32:02 +00:00
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if (!codec->channel_layouts)
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return AV_CH_LAYOUT_STEREO;
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p = codec->channel_layouts;
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while (*p) {
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int nb_channels = av_get_channel_layout_nb_channels(*p);
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2013-04-03 12:33:58 +00:00
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if (nb_channels > best_nb_channels) {
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2012-07-31 13:32:02 +00:00
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best_ch_layout = *p;
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2013-04-03 12:33:58 +00:00
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best_nb_channels = nb_channels;
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2012-07-31 13:32:02 +00:00
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}
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p++;
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}
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return best_ch_layout;
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}
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2001-07-22 14:18:56 +00:00
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/*
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2005-12-17 18:14:38 +00:00
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* Audio encoding example
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2001-07-22 14:18:56 +00:00
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*/
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2009-03-31 09:32:59 +00:00
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static void audio_encode_example(const char *filename)
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2001-07-22 14:18:56 +00:00
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{
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AVCodec *codec;
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2002-09-19 18:24:52 +00:00
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AVCodecContext *c= NULL;
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2012-07-31 13:32:02 +00:00
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AVFrame *frame;
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AVPacket pkt;
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int i, j, k, ret, got_output;
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int buffer_size;
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2001-07-22 14:18:56 +00:00
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FILE *f;
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2012-07-31 13:32:02 +00:00
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uint16_t *samples;
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2001-07-22 14:18:56 +00:00
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float t, tincr;
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printf("Audio encoding\n");
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/* find the MP2 encoder */
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2012-08-05 09:11:04 +00:00
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codec = avcodec_find_encoder(AV_CODEC_ID_MP2);
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2001-07-22 14:18:56 +00:00
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if (!codec) {
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fprintf(stderr, "codec not found\n");
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exit(1);
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}
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|
2011-06-18 11:40:48 +00:00
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c = avcodec_alloc_context3(codec);
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2005-12-17 18:14:38 +00:00
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2001-07-22 14:18:56 +00:00
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/* put sample parameters */
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c->bit_rate = 64000;
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2012-07-31 13:32:02 +00:00
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/* check that the encoder supports s16 pcm input */
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c->sample_fmt = AV_SAMPLE_FMT_S16;
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if (!check_sample_fmt(codec, c->sample_fmt)) {
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fprintf(stderr, "encoder does not support %s",
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av_get_sample_fmt_name(c->sample_fmt));
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exit(1);
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}
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/* select other audio parameters supported by the encoder */
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c->sample_rate = select_sample_rate(codec);
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c->channel_layout = select_channel_layout(codec);
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c->channels = av_get_channel_layout_nb_channels(c->channel_layout);
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2001-07-22 14:18:56 +00:00
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/* open it */
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2012-02-19 09:34:40 +00:00
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if (avcodec_open2(c, codec, NULL) < 0) {
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2001-07-22 14:18:56 +00:00
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fprintf(stderr, "could not open codec\n");
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exit(1);
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}
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2005-12-17 18:14:38 +00:00
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2004-04-09 15:04:51 +00:00
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f = fopen(filename, "wb");
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2001-07-22 14:18:56 +00:00
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if (!f) {
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fprintf(stderr, "could not open %s\n", filename);
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exit(1);
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}
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2005-12-17 18:14:38 +00:00
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2012-07-31 13:32:02 +00:00
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/* frame containing input raw audio */
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frame = avcodec_alloc_frame();
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if (!frame) {
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fprintf(stderr, "could not allocate audio frame\n");
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exit(1);
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}
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frame->nb_samples = c->frame_size;
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frame->format = c->sample_fmt;
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frame->channel_layout = c->channel_layout;
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/* the codec gives us the frame size, in samples,
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* we calculate the size of the samples buffer in bytes */
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buffer_size = av_samples_get_buffer_size(NULL, c->channels, c->frame_size,
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c->sample_fmt, 0);
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samples = av_malloc(buffer_size);
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if (!samples) {
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fprintf(stderr, "could not allocate %d bytes for samples buffer\n",
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buffer_size);
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exit(1);
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}
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/* setup the data pointers in the AVFrame */
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ret = avcodec_fill_audio_frame(frame, c->channels, c->sample_fmt,
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(const uint8_t*)samples, buffer_size, 0);
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if (ret < 0) {
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fprintf(stderr, "could not setup audio frame\n");
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exit(1);
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}
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2001-07-22 14:18:56 +00:00
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/* encode a single tone sound */
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t = 0;
|
2008-10-02 16:29:15 +00:00
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tincr = 2 * M_PI * 440.0 / c->sample_rate;
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2001-07-22 14:18:56 +00:00
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for(i=0;i<200;i++) {
|
2012-07-31 13:32:02 +00:00
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av_init_packet(&pkt);
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pkt.data = NULL; // packet data will be allocated by the encoder
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pkt.size = 0;
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for (j = 0; j < c->frame_size; j++) {
|
2001-07-22 14:18:56 +00:00
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samples[2*j] = (int)(sin(t) * 10000);
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2012-07-31 13:32:02 +00:00
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for (k = 1; k < c->channels; k++)
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samples[2*j + k] = samples[2*j];
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2001-07-22 14:18:56 +00:00
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t += tincr;
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}
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/* encode the samples */
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2012-07-31 13:32:02 +00:00
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ret = avcodec_encode_audio2(c, &pkt, frame, &got_output);
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if (ret < 0) {
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fprintf(stderr, "error encoding audio frame\n");
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exit(1);
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}
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if (got_output) {
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fwrite(pkt.data, 1, pkt.size, f);
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av_free_packet(&pkt);
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}
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2001-07-22 14:18:56 +00:00
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}
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fclose(f);
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|
2012-07-31 13:32:02 +00:00
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av_freep(&samples);
|
2012-09-21 07:10:23 +00:00
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avcodec_free_frame(&frame);
|
2001-07-22 14:18:56 +00:00
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avcodec_close(c);
|
2005-02-22 11:37:03 +00:00
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av_free(c);
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2001-07-22 14:18:56 +00:00
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}
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/*
|
2005-12-17 18:14:38 +00:00
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* Audio decoding.
|
2001-07-22 14:18:56 +00:00
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*/
|
2009-03-31 09:32:59 +00:00
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static void audio_decode_example(const char *outfilename, const char *filename)
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2001-07-22 14:18:56 +00:00
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{
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AVCodec *codec;
|
2002-09-19 18:24:52 +00:00
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AVCodecContext *c= NULL;
|
2011-11-11 20:44:41 +00:00
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int len;
|
2001-07-22 14:18:56 +00:00
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FILE *f, *outfile;
|
2010-05-25 19:13:28 +00:00
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uint8_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
|
2009-04-10 11:07:52 +00:00
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AVPacket avpkt;
|
2011-11-11 20:44:41 +00:00
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AVFrame *decoded_frame = NULL;
|
2009-04-10 11:07:52 +00:00
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av_init_packet(&avpkt);
|
2001-07-22 14:18:56 +00:00
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printf("Audio decoding\n");
|
2005-12-17 18:14:38 +00:00
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2001-07-22 14:18:56 +00:00
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/* find the mpeg audio decoder */
|
2012-08-05 09:11:04 +00:00
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codec = avcodec_find_decoder(AV_CODEC_ID_MP2);
|
2001-07-22 14:18:56 +00:00
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|
if (!codec) {
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fprintf(stderr, "codec not found\n");
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exit(1);
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}
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|
2011-06-18 11:40:48 +00:00
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c = avcodec_alloc_context3(codec);
|
2001-07-22 14:18:56 +00:00
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/* open it */
|
2012-02-19 09:34:40 +00:00
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if (avcodec_open2(c, codec, NULL) < 0) {
|
2001-07-22 14:18:56 +00:00
|
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|
fprintf(stderr, "could not open codec\n");
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|
exit(1);
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|
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}
|
2005-12-17 18:14:38 +00:00
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2004-04-09 15:04:51 +00:00
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f = fopen(filename, "rb");
|
2001-07-22 14:18:56 +00:00
|
|
|
if (!f) {
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fprintf(stderr, "could not open %s\n", filename);
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|
exit(1);
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|
|
|
}
|
2004-04-09 15:04:51 +00:00
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outfile = fopen(outfilename, "wb");
|
2001-07-22 14:18:56 +00:00
|
|
|
if (!outfile) {
|
2005-02-22 11:37:03 +00:00
|
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|
av_free(c);
|
2001-07-22 14:18:56 +00:00
|
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|
exit(1);
|
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
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|
2001-07-22 14:18:56 +00:00
|
|
|
/* decode until eof */
|
2009-04-10 11:07:52 +00:00
|
|
|
avpkt.data = inbuf;
|
2010-05-25 19:16:15 +00:00
|
|
|
avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);
|
|
|
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|
|
while (avpkt.size > 0) {
|
2011-11-11 20:44:41 +00:00
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int got_frame = 0;
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|
|
|
|
if (!decoded_frame) {
|
|
|
|
if (!(decoded_frame = avcodec_alloc_frame())) {
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|
fprintf(stderr, "out of memory\n");
|
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|
|
exit(1);
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|
|
|
}
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|
} else
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|
|
|
avcodec_get_frame_defaults(decoded_frame);
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|
len = avcodec_decode_audio4(c, decoded_frame, &got_frame, &avpkt);
|
2010-05-25 19:16:15 +00:00
|
|
|
if (len < 0) {
|
|
|
|
fprintf(stderr, "Error while decoding\n");
|
|
|
|
exit(1);
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
2011-11-11 20:44:41 +00:00
|
|
|
if (got_frame) {
|
2010-05-25 19:16:15 +00:00
|
|
|
/* if a frame has been decoded, output it */
|
2011-11-11 20:44:41 +00:00
|
|
|
int data_size = av_samples_get_buffer_size(NULL, c->channels,
|
|
|
|
decoded_frame->nb_samples,
|
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|
|
c->sample_fmt, 1);
|
|
|
|
fwrite(decoded_frame->data[0], 1, data_size, outfile);
|
2010-05-25 19:16:15 +00:00
|
|
|
}
|
|
|
|
avpkt.size -= len;
|
|
|
|
avpkt.data += len;
|
|
|
|
if (avpkt.size < AUDIO_REFILL_THRESH) {
|
|
|
|
/* Refill the input buffer, to avoid trying to decode
|
|
|
|
* incomplete frames. Instead of this, one could also use
|
|
|
|
* a parser, or use a proper container format through
|
|
|
|
* libavformat. */
|
|
|
|
memmove(inbuf, avpkt.data, avpkt.size);
|
|
|
|
avpkt.data = inbuf;
|
|
|
|
len = fread(avpkt.data + avpkt.size, 1,
|
|
|
|
AUDIO_INBUF_SIZE - avpkt.size, f);
|
|
|
|
if (len > 0)
|
|
|
|
avpkt.size += len;
|
|
|
|
}
|
|
|
|
}
|
2001-07-22 14:18:56 +00:00
|
|
|
|
|
|
|
fclose(outfile);
|
|
|
|
fclose(f);
|
|
|
|
|
|
|
|
avcodec_close(c);
|
2005-02-22 11:37:03 +00:00
|
|
|
av_free(c);
|
2012-09-21 07:10:23 +00:00
|
|
|
avcodec_free_frame(&decoded_frame);
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2005-12-17 18:14:38 +00:00
|
|
|
* Video encoding example
|
2001-07-22 14:18:56 +00:00
|
|
|
*/
|
2009-03-31 09:32:59 +00:00
|
|
|
static void video_encode_example(const char *filename)
|
2001-07-22 14:18:56 +00:00
|
|
|
{
|
|
|
|
AVCodec *codec;
|
2002-09-19 18:24:52 +00:00
|
|
|
AVCodecContext *c= NULL;
|
2012-07-31 14:35:18 +00:00
|
|
|
int i, ret, x, y, got_output;
|
2001-07-22 14:18:56 +00:00
|
|
|
FILE *f;
|
2002-12-09 12:03:43 +00:00
|
|
|
AVFrame *picture;
|
2012-07-31 14:35:18 +00:00
|
|
|
AVPacket pkt;
|
|
|
|
uint8_t endcode[] = { 0, 0, 1, 0xb7 };
|
2001-07-22 14:18:56 +00:00
|
|
|
|
|
|
|
printf("Video encoding\n");
|
|
|
|
|
|
|
|
/* find the mpeg1 video encoder */
|
2012-08-05 09:11:04 +00:00
|
|
|
codec = avcodec_find_encoder(AV_CODEC_ID_MPEG1VIDEO);
|
2001-07-22 14:18:56 +00:00
|
|
|
if (!codec) {
|
|
|
|
fprintf(stderr, "codec not found\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
2011-06-18 11:40:48 +00:00
|
|
|
c = avcodec_alloc_context3(codec);
|
2002-12-09 12:03:43 +00:00
|
|
|
picture= avcodec_alloc_frame();
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
/* put sample parameters */
|
|
|
|
c->bit_rate = 400000;
|
|
|
|
/* resolution must be a multiple of two */
|
2005-12-17 18:14:38 +00:00
|
|
|
c->width = 352;
|
2001-07-22 14:18:56 +00:00
|
|
|
c->height = 288;
|
|
|
|
/* frames per second */
|
2005-04-30 21:43:59 +00:00
|
|
|
c->time_base= (AVRational){1,25};
|
2001-07-22 14:18:56 +00:00
|
|
|
c->gop_size = 10; /* emit one intra frame every ten frames */
|
2003-07-23 10:41:07 +00:00
|
|
|
c->max_b_frames=1;
|
2012-10-06 10:10:34 +00:00
|
|
|
c->pix_fmt = AV_PIX_FMT_YUV420P;
|
2001-07-22 14:18:56 +00:00
|
|
|
|
|
|
|
/* open it */
|
2012-02-19 09:34:40 +00:00
|
|
|
if (avcodec_open2(c, codec, NULL) < 0) {
|
2001-07-22 14:18:56 +00:00
|
|
|
fprintf(stderr, "could not open codec\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2004-04-09 15:04:51 +00:00
|
|
|
f = fopen(filename, "wb");
|
2001-07-22 14:18:56 +00:00
|
|
|
if (!f) {
|
|
|
|
fprintf(stderr, "could not open %s\n", filename);
|
|
|
|
exit(1);
|
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2012-07-31 14:35:18 +00:00
|
|
|
ret = av_image_alloc(picture->data, picture->linesize, c->width, c->height,
|
|
|
|
c->pix_fmt, 32);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "could not alloc raw picture buffer\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
picture->format = c->pix_fmt;
|
|
|
|
picture->width = c->width;
|
|
|
|
picture->height = c->height;
|
2001-07-22 14:18:56 +00:00
|
|
|
|
|
|
|
/* encode 1 second of video */
|
|
|
|
for(i=0;i<25;i++) {
|
2012-07-31 14:35:18 +00:00
|
|
|
av_init_packet(&pkt);
|
|
|
|
pkt.data = NULL; // packet data will be allocated by the encoder
|
|
|
|
pkt.size = 0;
|
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
fflush(stdout);
|
|
|
|
/* prepare a dummy image */
|
|
|
|
/* Y */
|
|
|
|
for(y=0;y<c->height;y++) {
|
|
|
|
for(x=0;x<c->width;x++) {
|
2002-12-06 17:39:32 +00:00
|
|
|
picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Cb and Cr */
|
|
|
|
for(y=0;y<c->height/2;y++) {
|
|
|
|
for(x=0;x<c->width/2;x++) {
|
2002-12-06 17:39:32 +00:00
|
|
|
picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
|
|
|
|
picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-07-31 14:35:18 +00:00
|
|
|
picture->pts = i;
|
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
/* encode the image */
|
2012-07-31 14:35:18 +00:00
|
|
|
ret = avcodec_encode_video2(c, &pkt, picture, &got_output);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "error encoding frame\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (got_output) {
|
|
|
|
printf("encoding frame %3d (size=%5d)\n", i, pkt.size);
|
|
|
|
fwrite(pkt.data, 1, pkt.size, f);
|
|
|
|
av_free_packet(&pkt);
|
|
|
|
}
|
2003-07-23 10:41:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* get the delayed frames */
|
2012-07-31 14:35:18 +00:00
|
|
|
for (got_output = 1; got_output; i++) {
|
2003-07-23 10:41:07 +00:00
|
|
|
fflush(stdout);
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2012-07-31 14:35:18 +00:00
|
|
|
ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "error encoding frame\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (got_output) {
|
|
|
|
printf("encoding frame %3d (size=%5d)\n", i, pkt.size);
|
|
|
|
fwrite(pkt.data, 1, pkt.size, f);
|
|
|
|
av_free_packet(&pkt);
|
|
|
|
}
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* add sequence end code to have a real mpeg file */
|
2012-07-31 14:35:18 +00:00
|
|
|
fwrite(endcode, 1, sizeof(endcode), f);
|
2001-07-22 14:18:56 +00:00
|
|
|
fclose(f);
|
|
|
|
|
|
|
|
avcodec_close(c);
|
2005-02-22 11:37:03 +00:00
|
|
|
av_free(c);
|
2012-07-31 14:35:18 +00:00
|
|
|
av_freep(&picture->data[0]);
|
2012-09-21 07:10:23 +00:00
|
|
|
avcodec_free_frame(&picture);
|
2001-07-22 14:18:56 +00:00
|
|
|
printf("\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2005-12-17 18:14:38 +00:00
|
|
|
* Video decoding example
|
2001-07-22 14:18:56 +00:00
|
|
|
*/
|
|
|
|
|
2009-03-31 09:32:59 +00:00
|
|
|
static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize,
|
|
|
|
char *filename)
|
2001-07-22 14:18:56 +00:00
|
|
|
{
|
|
|
|
FILE *f;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
f=fopen(filename,"w");
|
|
|
|
fprintf(f,"P5\n%d %d\n%d\n",xsize,ysize,255);
|
|
|
|
for(i=0;i<ysize;i++)
|
|
|
|
fwrite(buf + i * wrap,1,xsize,f);
|
|
|
|
fclose(f);
|
|
|
|
}
|
|
|
|
|
2009-03-31 09:32:59 +00:00
|
|
|
static void video_decode_example(const char *outfilename, const char *filename)
|
2001-07-22 14:18:56 +00:00
|
|
|
{
|
|
|
|
AVCodec *codec;
|
2002-09-19 18:24:52 +00:00
|
|
|
AVCodecContext *c= NULL;
|
2009-04-10 11:07:52 +00:00
|
|
|
int frame, got_picture, len;
|
2001-07-22 14:18:56 +00:00
|
|
|
FILE *f;
|
2002-12-09 12:03:43 +00:00
|
|
|
AVFrame *picture;
|
2009-04-10 11:07:52 +00:00
|
|
|
uint8_t inbuf[INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
|
2001-07-22 14:18:56 +00:00
|
|
|
char buf[1024];
|
2009-04-10 11:07:52 +00:00
|
|
|
AVPacket avpkt;
|
|
|
|
|
|
|
|
av_init_packet(&avpkt);
|
2001-07-22 14:18:56 +00:00
|
|
|
|
2003-08-01 11:01:05 +00:00
|
|
|
/* set end of buffer to 0 (this ensures that no overreading happens for damaged mpeg streams) */
|
|
|
|
memset(inbuf + INBUF_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
|
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
printf("Video decoding\n");
|
|
|
|
|
|
|
|
/* find the mpeg1 video decoder */
|
2012-08-05 09:11:04 +00:00
|
|
|
codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO);
|
2001-07-22 14:18:56 +00:00
|
|
|
if (!codec) {
|
|
|
|
fprintf(stderr, "codec not found\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
2011-06-18 11:40:48 +00:00
|
|
|
c = avcodec_alloc_context3(codec);
|
2002-12-09 12:03:43 +00:00
|
|
|
picture= avcodec_alloc_frame();
|
2001-07-22 14:18:56 +00:00
|
|
|
|
2002-11-26 16:16:04 +00:00
|
|
|
if(codec->capabilities&CODEC_CAP_TRUNCATED)
|
2007-06-12 09:29:25 +00:00
|
|
|
c->flags|= CODEC_FLAG_TRUNCATED; /* we do not send complete frames */
|
2002-11-26 16:16:04 +00:00
|
|
|
|
2007-06-12 09:29:25 +00:00
|
|
|
/* For some codecs, such as msmpeg4 and mpeg4, width and height
|
|
|
|
MUST be initialized there because this information is not
|
|
|
|
available in the bitstream. */
|
2001-07-22 14:18:56 +00:00
|
|
|
|
|
|
|
/* open it */
|
2012-02-19 09:34:40 +00:00
|
|
|
if (avcodec_open2(c, codec, NULL) < 0) {
|
2001-07-22 14:18:56 +00:00
|
|
|
fprintf(stderr, "could not open codec\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
/* the codec gives us the frame size, in samples */
|
|
|
|
|
2004-04-09 15:04:51 +00:00
|
|
|
f = fopen(filename, "rb");
|
2001-07-22 14:18:56 +00:00
|
|
|
if (!f) {
|
|
|
|
fprintf(stderr, "could not open %s\n", filename);
|
|
|
|
exit(1);
|
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
frame = 0;
|
|
|
|
for(;;) {
|
2009-04-10 11:07:52 +00:00
|
|
|
avpkt.size = fread(inbuf, 1, INBUF_SIZE, f);
|
|
|
|
if (avpkt.size == 0)
|
2001-07-22 14:18:56 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
/* NOTE1: some codecs are stream based (mpegvideo, mpegaudio)
|
|
|
|
and this is the only method to use them because you cannot
|
2005-12-17 18:14:38 +00:00
|
|
|
know the compressed data size before analysing it.
|
2001-07-22 14:18:56 +00:00
|
|
|
|
2001-08-15 13:12:23 +00:00
|
|
|
BUT some other codecs (msmpeg4, mpeg4) are inherently frame
|
|
|
|
based, so you must call them with all the data for one
|
|
|
|
frame exactly. You must also initialize 'width' and
|
2001-07-22 14:18:56 +00:00
|
|
|
'height' before initializing them. */
|
|
|
|
|
|
|
|
/* NOTE2: some codecs allow the raw parameters (frame size,
|
|
|
|
sample rate) to be changed at any frame. We handle this, so
|
|
|
|
you should also take care of it */
|
|
|
|
|
|
|
|
/* here, we use a stream based decoder (mpeg1video), so we
|
|
|
|
feed decoder and see if it could decode a frame */
|
2009-04-10 11:07:52 +00:00
|
|
|
avpkt.data = inbuf;
|
|
|
|
while (avpkt.size > 0) {
|
|
|
|
len = avcodec_decode_video2(c, picture, &got_picture, &avpkt);
|
2001-07-22 14:18:56 +00:00
|
|
|
if (len < 0) {
|
|
|
|
fprintf(stderr, "Error while decoding frame %d\n", frame);
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
if (got_picture) {
|
2003-07-23 10:41:07 +00:00
|
|
|
printf("saving frame %3d\n", frame);
|
2001-07-22 14:18:56 +00:00
|
|
|
fflush(stdout);
|
|
|
|
|
|
|
|
/* the picture is allocated by the decoder. no need to
|
|
|
|
free it */
|
|
|
|
snprintf(buf, sizeof(buf), outfilename, frame);
|
2005-12-17 18:14:38 +00:00
|
|
|
pgm_save(picture->data[0], picture->linesize[0],
|
2001-07-22 14:18:56 +00:00
|
|
|
c->width, c->height, buf);
|
|
|
|
frame++;
|
|
|
|
}
|
2009-04-10 11:07:52 +00:00
|
|
|
avpkt.size -= len;
|
|
|
|
avpkt.data += len;
|
2001-07-22 14:18:56 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* some codecs, such as MPEG, transmit the I and P frame with a
|
|
|
|
latency of one frame. You must do the following to have a
|
|
|
|
chance to get the last frame of the video */
|
2009-04-10 11:07:52 +00:00
|
|
|
avpkt.data = NULL;
|
|
|
|
avpkt.size = 0;
|
|
|
|
len = avcodec_decode_video2(c, picture, &got_picture, &avpkt);
|
2001-07-22 14:18:56 +00:00
|
|
|
if (got_picture) {
|
2003-07-23 10:41:07 +00:00
|
|
|
printf("saving last frame %3d\n", frame);
|
2001-07-22 14:18:56 +00:00
|
|
|
fflush(stdout);
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
/* the picture is allocated by the decoder. no need to
|
|
|
|
free it */
|
|
|
|
snprintf(buf, sizeof(buf), outfilename, frame);
|
2005-12-17 18:14:38 +00:00
|
|
|
pgm_save(picture->data[0], picture->linesize[0],
|
2001-07-22 14:18:56 +00:00
|
|
|
c->width, c->height, buf);
|
|
|
|
frame++;
|
|
|
|
}
|
2005-12-17 18:14:38 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
fclose(f);
|
|
|
|
|
|
|
|
avcodec_close(c);
|
2005-02-22 11:37:03 +00:00
|
|
|
av_free(c);
|
2012-09-21 07:10:23 +00:00
|
|
|
avcodec_free_frame(&picture);
|
2001-07-22 14:18:56 +00:00
|
|
|
printf("\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
|
|
{
|
|
|
|
const char *filename;
|
|
|
|
|
2007-06-13 08:28:00 +00:00
|
|
|
/* register all the codecs */
|
2001-07-22 14:18:56 +00:00
|
|
|
avcodec_register_all();
|
2003-02-10 09:40:23 +00:00
|
|
|
|
2001-07-22 14:18:56 +00:00
|
|
|
if (argc <= 1) {
|
|
|
|
audio_encode_example("/tmp/test.mp2");
|
|
|
|
audio_decode_example("/tmp/test.sw", "/tmp/test.mp2");
|
|
|
|
|
|
|
|
video_encode_example("/tmp/test.mpg");
|
|
|
|
filename = "/tmp/test.mpg";
|
|
|
|
} else {
|
|
|
|
filename = argv[1];
|
|
|
|
}
|
|
|
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// audio_decode_example("/tmp/test.sw", filename);
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video_decode_example("/tmp/test%d.pgm", filename);
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return 0;
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}
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