665 lines
19 KiB
C
665 lines
19 KiB
C
/*
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* Copyright (c) 2001 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/**
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* @file
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* libavcodec API use example.
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*
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* @example avcodec.c
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* Note that libavcodec only handles codecs (mpeg, mpeg4, etc...),
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* not file formats (avi, vob, mp4, mov, mkv, mxf, flv, mpegts, mpegps, etc...). See library 'libavformat' for the
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* format handling
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*/
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#include <math.h>
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#include <libavutil/opt.h>
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#include <libavcodec/avcodec.h>
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#include <libavutil/channel_layout.h>
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#include <libavutil/common.h>
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#include <libavutil/imgutils.h>
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#include <libavutil/mathematics.h>
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#include <libavutil/samplefmt.h>
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#define INBUF_SIZE 4096
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#define AUDIO_INBUF_SIZE 20480
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#define AUDIO_REFILL_THRESH 4096
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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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int best_nb_channels = 0;
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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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if (nb_channels > best_nb_channels) {
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best_ch_layout = *p;
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best_nb_channels = nb_channels;
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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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/*
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* Audio encoding example
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*/
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static void audio_encode_example(const char *filename)
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{
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AVCodec *codec;
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AVCodecContext *c= NULL;
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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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FILE *f;
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uint16_t *samples;
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float t, tincr;
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printf("Encode audio file %s\n", filename);
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/* find the MP2 encoder */
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codec = avcodec_find_encoder(AV_CODEC_ID_MP2);
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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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c = avcodec_alloc_context3(codec);
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if (!c) {
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fprintf(stderr, "Could not allocate audio codec context\n");
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exit(1);
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}
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/* put sample parameters */
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c->bit_rate = 64000;
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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 sample format %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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/* open it */
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if (avcodec_open2(c, codec, NULL) < 0) {
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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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f = fopen(filename, "wb");
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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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/* frame containing input raw audio */
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frame = av_frame_alloc();
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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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if (buffer_size < 0) {
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fprintf(stderr, "Could not get sample buffer size\n");
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exit(1);
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}
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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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/* encode a single tone sound */
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t = 0;
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tincr = 2 * M_PI * 440.0 / c->sample_rate;
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for (i = 0; i < 200; i++) {
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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++) {
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samples[2*j] = (int)(sin(t) * 10000);
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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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t += tincr;
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}
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/* encode the samples */
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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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}
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/* get the delayed frames */
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for (got_output = 1; got_output; i++) {
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ret = avcodec_encode_audio2(c, &pkt, NULL, &got_output);
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if (ret < 0) {
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fprintf(stderr, "Error encoding 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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}
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fclose(f);
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av_freep(&samples);
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av_frame_free(&frame);
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avcodec_close(c);
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av_free(c);
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}
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/*
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* Audio decoding.
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*/
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static void audio_decode_example(const char *outfilename, const char *filename)
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{
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AVCodec *codec;
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AVCodecContext *c= NULL;
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int len;
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FILE *f, *outfile;
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uint8_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
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AVPacket avpkt;
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AVFrame *decoded_frame = NULL;
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av_init_packet(&avpkt);
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printf("Decode audio file %s to %s\n", filename, outfilename);
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/* find the mpeg audio decoder */
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codec = avcodec_find_decoder(AV_CODEC_ID_MP2);
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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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c = avcodec_alloc_context3(codec);
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if (!c) {
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fprintf(stderr, "Could not allocate audio codec context\n");
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exit(1);
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}
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/* open it */
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if (avcodec_open2(c, codec, NULL) < 0) {
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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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f = fopen(filename, "rb");
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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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outfile = fopen(outfilename, "wb");
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if (!outfile) {
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av_free(c);
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exit(1);
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}
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/* decode until eof */
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avpkt.data = inbuf;
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avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);
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while (avpkt.size > 0) {
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int got_frame = 0;
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if (!decoded_frame) {
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if (!(decoded_frame = av_frame_alloc())) {
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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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}
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len = avcodec_decode_audio4(c, decoded_frame, &got_frame, &avpkt);
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if (len < 0) {
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fprintf(stderr, "Error while decoding\n");
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exit(1);
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}
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if (got_frame) {
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/* if a frame has been decoded, output it */
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int data_size = av_samples_get_buffer_size(NULL, c->channels,
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decoded_frame->nb_samples,
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c->sample_fmt, 1);
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if (data_size < 0) {
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/* This should not occur, checking just for paranoia */
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fprintf(stderr, "Failed to calculate data size\n");
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exit(1);
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}
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fwrite(decoded_frame->data[0], 1, data_size, outfile);
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}
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avpkt.size -= len;
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avpkt.data += len;
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avpkt.dts =
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avpkt.pts = AV_NOPTS_VALUE;
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if (avpkt.size < AUDIO_REFILL_THRESH) {
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/* Refill the input buffer, to avoid trying to decode
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* incomplete frames. Instead of this, one could also use
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* a parser, or use a proper container format through
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* libavformat. */
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memmove(inbuf, avpkt.data, avpkt.size);
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avpkt.data = inbuf;
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len = fread(avpkt.data + avpkt.size, 1,
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AUDIO_INBUF_SIZE - avpkt.size, f);
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if (len > 0)
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avpkt.size += len;
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}
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}
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fclose(outfile);
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fclose(f);
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avcodec_close(c);
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av_free(c);
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av_frame_free(&decoded_frame);
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}
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/*
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* Video encoding example
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*/
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static void video_encode_example(const char *filename, int codec_id)
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{
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AVCodec *codec;
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AVCodecContext *c= NULL;
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int i, ret, x, y, got_output;
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FILE *f;
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AVFrame *frame;
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AVPacket pkt;
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uint8_t endcode[] = { 0, 0, 1, 0xb7 };
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printf("Encode video file %s\n", filename);
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/* find the mpeg1 video encoder */
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codec = avcodec_find_encoder(codec_id);
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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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c = avcodec_alloc_context3(codec);
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if (!c) {
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fprintf(stderr, "Could not allocate video codec context\n");
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exit(1);
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}
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/* put sample parameters */
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c->bit_rate = 400000;
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/* resolution must be a multiple of two */
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c->width = 352;
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c->height = 288;
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/* frames per second */
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c->time_base = (AVRational){1,25};
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/* emit one intra frame every ten frames
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* check frame pict_type before passing frame
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* to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
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* then gop_size is ignored and the output of encoder
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* will always be I frame irrespective to gop_size
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*/
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c->gop_size = 10;
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c->max_b_frames = 1;
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c->pix_fmt = AV_PIX_FMT_YUV420P;
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if (codec_id == AV_CODEC_ID_H264)
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av_opt_set(c->priv_data, "preset", "slow", 0);
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/* open it */
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if (avcodec_open2(c, codec, NULL) < 0) {
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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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f = fopen(filename, "wb");
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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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frame = av_frame_alloc();
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if (!frame) {
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fprintf(stderr, "Could not allocate video frame\n");
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exit(1);
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}
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frame->format = c->pix_fmt;
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frame->width = c->width;
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frame->height = c->height;
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/* the image can be allocated by any means and av_image_alloc() is
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* just the most convenient way if av_malloc() is to be used */
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ret = av_image_alloc(frame->data, frame->linesize, c->width, c->height,
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c->pix_fmt, 32);
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if (ret < 0) {
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fprintf(stderr, "Could not allocate raw picture buffer\n");
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exit(1);
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}
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/* encode 1 second of video */
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for (i = 0; i < 25; i++) {
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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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fflush(stdout);
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/* prepare a dummy image */
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/* Y */
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for (y = 0; y < c->height; y++) {
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for (x = 0; x < c->width; x++) {
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frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
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}
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}
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/* Cb and Cr */
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for (y = 0; y < c->height/2; y++) {
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for (x = 0; x < c->width/2; x++) {
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frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2;
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frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5;
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}
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}
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frame->pts = i;
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/* encode the image */
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ret = avcodec_encode_video2(c, &pkt, frame, &got_output);
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if (ret < 0) {
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fprintf(stderr, "Error encoding frame\n");
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exit(1);
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}
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if (got_output) {
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printf("Write frame %3d (size=%5d)\n", i, pkt.size);
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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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}
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/* get the delayed frames */
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for (got_output = 1; got_output; i++) {
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fflush(stdout);
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ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
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if (ret < 0) {
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fprintf(stderr, "Error encoding frame\n");
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exit(1);
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}
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if (got_output) {
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printf("Write frame %3d (size=%5d)\n", i, pkt.size);
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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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}
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/* add sequence end code to have a real mpeg file */
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fwrite(endcode, 1, sizeof(endcode), f);
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fclose(f);
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avcodec_close(c);
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av_free(c);
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av_freep(&frame->data[0]);
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av_frame_free(&frame);
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printf("\n");
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}
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/*
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* Video decoding example
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*/
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static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize,
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char *filename)
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{
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FILE *f;
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int i;
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f = fopen(filename,"w");
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fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255);
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for (i = 0; i < ysize; i++)
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fwrite(buf + i * wrap, 1, xsize, f);
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fclose(f);
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}
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static int decode_write_frame(const char *outfilename, AVCodecContext *avctx,
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AVFrame *frame, int *frame_count, AVPacket *pkt, int last)
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{
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int len, got_frame;
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char buf[1024];
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len = avcodec_decode_video2(avctx, frame, &got_frame, pkt);
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if (len < 0) {
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fprintf(stderr, "Error while decoding frame %d\n", *frame_count);
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return len;
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}
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if (got_frame) {
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printf("Saving %sframe %3d\n", last ? "last " : "", *frame_count);
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fflush(stdout);
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/* the picture is allocated by the decoder, no need to free it */
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snprintf(buf, sizeof(buf), outfilename, *frame_count);
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pgm_save(frame->data[0], frame->linesize[0],
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avctx->width, avctx->height, buf);
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(*frame_count)++;
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}
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if (pkt->data) {
|
|
pkt->size -= len;
|
|
pkt->data += len;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void video_decode_example(const char *outfilename, const char *filename)
|
|
{
|
|
AVCodec *codec;
|
|
AVCodecContext *c= NULL;
|
|
int frame_count;
|
|
FILE *f;
|
|
AVFrame *frame;
|
|
uint8_t inbuf[INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
|
|
AVPacket avpkt;
|
|
|
|
av_init_packet(&avpkt);
|
|
|
|
/* 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);
|
|
|
|
printf("Decode video file %s to %s\n", filename, outfilename);
|
|
|
|
/* find the mpeg1 video decoder */
|
|
codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO);
|
|
if (!codec) {
|
|
fprintf(stderr, "Codec not found\n");
|
|
exit(1);
|
|
}
|
|
|
|
c = avcodec_alloc_context3(codec);
|
|
if (!c) {
|
|
fprintf(stderr, "Could not allocate video codec context\n");
|
|
exit(1);
|
|
}
|
|
|
|
if(codec->capabilities&CODEC_CAP_TRUNCATED)
|
|
c->flags|= CODEC_FLAG_TRUNCATED; /* we do not send complete frames */
|
|
|
|
/* For some codecs, such as msmpeg4 and mpeg4, width and height
|
|
MUST be initialized there because this information is not
|
|
available in the bitstream. */
|
|
|
|
/* open it */
|
|
if (avcodec_open2(c, codec, NULL) < 0) {
|
|
fprintf(stderr, "Could not open codec\n");
|
|
exit(1);
|
|
}
|
|
|
|
f = fopen(filename, "rb");
|
|
if (!f) {
|
|
fprintf(stderr, "Could not open %s\n", filename);
|
|
exit(1);
|
|
}
|
|
|
|
frame = av_frame_alloc();
|
|
if (!frame) {
|
|
fprintf(stderr, "Could not allocate video frame\n");
|
|
exit(1);
|
|
}
|
|
|
|
frame_count = 0;
|
|
for (;;) {
|
|
avpkt.size = fread(inbuf, 1, INBUF_SIZE, f);
|
|
if (avpkt.size == 0)
|
|
break;
|
|
|
|
/* NOTE1: some codecs are stream based (mpegvideo, mpegaudio)
|
|
and this is the only method to use them because you cannot
|
|
know the compressed data size before analysing it.
|
|
|
|
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
|
|
'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 */
|
|
avpkt.data = inbuf;
|
|
while (avpkt.size > 0)
|
|
if (decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 0) < 0)
|
|
exit(1);
|
|
}
|
|
|
|
/* 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 */
|
|
avpkt.data = NULL;
|
|
avpkt.size = 0;
|
|
decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 1);
|
|
|
|
fclose(f);
|
|
|
|
avcodec_close(c);
|
|
av_free(c);
|
|
av_frame_free(&frame);
|
|
printf("\n");
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
const char *output_type;
|
|
|
|
/* register all the codecs */
|
|
avcodec_register_all();
|
|
|
|
if (argc < 2) {
|
|
printf("usage: %s output_type\n"
|
|
"API example program to decode/encode a media stream with libavcodec.\n"
|
|
"This program generates a synthetic stream and encodes it to a file\n"
|
|
"named test.h264, test.mp2 or test.mpg depending on output_type.\n"
|
|
"The encoded stream is then decoded and written to a raw data output.\n"
|
|
"output_type must be choosen between 'h264', 'mp2', 'mpg'.\n",
|
|
argv[0]);
|
|
return 1;
|
|
}
|
|
output_type = argv[1];
|
|
|
|
if (!strcmp(output_type, "h264")) {
|
|
video_encode_example("test.h264", AV_CODEC_ID_H264);
|
|
} else if (!strcmp(output_type, "mp2")) {
|
|
audio_encode_example("test.mp2");
|
|
audio_decode_example("test.sw", "test.mp2");
|
|
} else if (!strcmp(output_type, "mpg")) {
|
|
video_encode_example("test.mpg", AV_CODEC_ID_MPEG1VIDEO);
|
|
video_decode_example("test%02d.pgm", "test.mpg");
|
|
} else {
|
|
fprintf(stderr, "Invalid output type '%s', choose between 'h264', 'mp2', or 'mpg'\n",
|
|
output_type);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|