2003-07-22 14:46:15 +02:00
|
|
|
/*
|
|
|
|
* Copyright (c) 2003 Fabrice Bellard
|
2005-12-17 19:14:38 +01:00
|
|
|
*
|
2003-07-22 14:46:15 +02:00
|
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
|
|
* in the Software without restriction, including without limitation the rights
|
|
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
|
|
* furnished to do so, subject to the following conditions:
|
2005-12-17 19:14:38 +01:00
|
|
|
*
|
2003-07-22 14:46:15 +02:00
|
|
|
* The above copyright notice and this permission notice shall be included in
|
|
|
|
* all copies or substantial portions of the Software.
|
2005-12-17 19:14:38 +01:00
|
|
|
*
|
2003-07-22 14:46:15 +02:00
|
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
2005-12-17 19:14:38 +01:00
|
|
|
* THE SOFTWARE.
|
2003-07-22 14:46:15 +02:00
|
|
|
*/
|
2011-06-30 21:06:25 +02:00
|
|
|
|
|
|
|
/**
|
|
|
|
* @file
|
|
|
|
* libavformat API example.
|
|
|
|
*
|
2014-02-15 15:50:29 +01:00
|
|
|
* @example output.c
|
2014-02-11 15:49:39 +01:00
|
|
|
* Output a media file in any supported libavformat format. The default
|
|
|
|
* codecs are used.
|
2011-06-30 21:06:25 +02:00
|
|
|
*/
|
|
|
|
|
2003-07-22 14:46:15 +02:00
|
|
|
#include <stdlib.h>
|
|
|
|
#include <stdio.h>
|
2004-01-06 22:03:41 +01:00
|
|
|
#include <string.h>
|
2003-07-22 14:46:15 +02:00
|
|
|
#include <math.h>
|
|
|
|
|
2014-06-23 21:38:37 +02:00
|
|
|
#include "libavutil/channel_layout.h"
|
2011-06-04 13:58:23 +02:00
|
|
|
#include "libavutil/mathematics.h"
|
2014-07-24 19:47:26 +02:00
|
|
|
#include "libavutil/opt.h"
|
2008-05-09 13:56:36 +02:00
|
|
|
#include "libavformat/avformat.h"
|
2014-07-24 19:47:26 +02:00
|
|
|
#include "libavresample/avresample.h"
|
2008-05-09 13:56:36 +02:00
|
|
|
#include "libswscale/swscale.h"
|
2003-07-22 14:46:15 +02:00
|
|
|
|
|
|
|
/* 5 seconds stream duration */
|
2003-09-11 01:09:30 +02:00
|
|
|
#define STREAM_DURATION 5.0
|
|
|
|
#define STREAM_FRAME_RATE 25 /* 25 images/s */
|
|
|
|
#define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
|
2012-10-06 12:10:34 +02:00
|
|
|
#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */
|
2003-07-22 14:46:15 +02:00
|
|
|
|
2014-06-24 09:28:41 +02:00
|
|
|
#define SCALE_FLAGS SWS_BICUBIC
|
2006-08-03 18:55:36 +02:00
|
|
|
|
2014-06-21 17:17:40 +02:00
|
|
|
// a wrapper around a single output AVStream
|
|
|
|
typedef struct OutputStream {
|
|
|
|
AVStream *st;
|
2016-02-10 14:13:39 +01:00
|
|
|
AVCodecContext *enc;
|
2014-06-21 17:17:40 +02:00
|
|
|
|
2014-06-24 10:52:26 +02:00
|
|
|
/* pts of the next frame that will be generated */
|
|
|
|
int64_t next_pts;
|
|
|
|
|
2014-06-21 17:17:40 +02:00
|
|
|
AVFrame *frame;
|
|
|
|
AVFrame *tmp_frame;
|
2014-06-24 08:56:27 +02:00
|
|
|
|
|
|
|
float t, tincr, tincr2;
|
2014-06-24 10:21:07 +02:00
|
|
|
|
|
|
|
struct SwsContext *sws_ctx;
|
2014-07-24 19:47:26 +02:00
|
|
|
AVAudioResampleContext *avr;
|
2014-06-21 17:17:40 +02:00
|
|
|
} OutputStream;
|
|
|
|
|
2003-07-22 14:46:15 +02:00
|
|
|
/**************************************************************/
|
|
|
|
/* audio output */
|
|
|
|
|
2005-12-17 19:14:38 +01:00
|
|
|
/*
|
2003-07-22 14:46:15 +02:00
|
|
|
* add an audio output stream
|
|
|
|
*/
|
2014-06-24 08:56:27 +02:00
|
|
|
static void add_audio_stream(OutputStream *ost, AVFormatContext *oc,
|
|
|
|
enum AVCodecID codec_id)
|
2003-07-22 14:46:15 +02:00
|
|
|
{
|
|
|
|
AVCodecContext *c;
|
2012-01-28 20:12:45 +01:00
|
|
|
AVCodec *codec;
|
2014-07-24 19:47:26 +02:00
|
|
|
int ret;
|
2012-01-28 20:12:45 +01:00
|
|
|
|
|
|
|
/* find the audio encoder */
|
|
|
|
codec = avcodec_find_encoder(codec_id);
|
|
|
|
if (!codec) {
|
|
|
|
fprintf(stderr, "codec not found\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2003-07-22 14:46:15 +02:00
|
|
|
|
2016-02-10 14:13:39 +01:00
|
|
|
ost->st = avformat_new_stream(oc, NULL);
|
2014-06-24 08:56:27 +02:00
|
|
|
if (!ost->st) {
|
2003-07-22 14:46:15 +02:00
|
|
|
fprintf(stderr, "Could not alloc stream\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
2016-02-10 14:13:39 +01:00
|
|
|
c = avcodec_alloc_context3(codec);
|
|
|
|
if (!c) {
|
|
|
|
fprintf(stderr, "Could not alloc an encoding context\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
ost->enc = c;
|
2003-07-22 14:46:15 +02:00
|
|
|
|
|
|
|
/* put sample parameters */
|
2014-07-24 19:47:26 +02:00
|
|
|
c->sample_fmt = codec->sample_fmts ? codec->sample_fmts[0] : AV_SAMPLE_FMT_S16;
|
|
|
|
c->sample_rate = codec->supported_samplerates ? codec->supported_samplerates[0] : 44100;
|
|
|
|
c->channel_layout = codec->channel_layouts ? codec->channel_layouts[0] : AV_CH_LAYOUT_STEREO;
|
|
|
|
c->channels = av_get_channel_layout_nb_channels(c->channel_layout);
|
|
|
|
c->bit_rate = 64000;
|
2010-01-21 18:10:13 +01:00
|
|
|
|
2014-07-23 13:09:16 +02:00
|
|
|
ost->st->time_base = (AVRational){ 1, c->sample_rate };
|
|
|
|
|
2010-01-21 18:10:13 +01:00
|
|
|
// some formats want stream headers to be separate
|
2012-03-30 02:27:05 +02:00
|
|
|
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
|
2015-06-29 21:59:37 +02:00
|
|
|
c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
|
2014-07-24 19:47:26 +02:00
|
|
|
|
|
|
|
/* initialize sample format conversion;
|
|
|
|
* to simplify the code, we always pass the data through lavr, even
|
|
|
|
* if the encoder supports the generated format directly -- the price is
|
|
|
|
* some extra data copying;
|
|
|
|
*/
|
|
|
|
ost->avr = avresample_alloc_context();
|
|
|
|
if (!ost->avr) {
|
|
|
|
fprintf(stderr, "Error allocating the resampling context\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
av_opt_set_int(ost->avr, "in_sample_fmt", AV_SAMPLE_FMT_S16, 0);
|
|
|
|
av_opt_set_int(ost->avr, "in_sample_rate", 44100, 0);
|
|
|
|
av_opt_set_int(ost->avr, "in_channel_layout", AV_CH_LAYOUT_STEREO, 0);
|
|
|
|
av_opt_set_int(ost->avr, "out_sample_fmt", c->sample_fmt, 0);
|
|
|
|
av_opt_set_int(ost->avr, "out_sample_rate", c->sample_rate, 0);
|
|
|
|
av_opt_set_int(ost->avr, "out_channel_layout", c->channel_layout, 0);
|
|
|
|
|
|
|
|
ret = avresample_open(ost->avr);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "Error opening the resampling context\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static AVFrame *alloc_audio_frame(enum AVSampleFormat sample_fmt,
|
|
|
|
uint64_t channel_layout,
|
|
|
|
int sample_rate, int nb_samples)
|
|
|
|
{
|
|
|
|
AVFrame *frame = av_frame_alloc();
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (!frame) {
|
|
|
|
fprintf(stderr, "Error allocating an audio frame\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
frame->format = sample_fmt;
|
|
|
|
frame->channel_layout = channel_layout;
|
|
|
|
frame->sample_rate = sample_rate;
|
|
|
|
frame->nb_samples = nb_samples;
|
|
|
|
|
|
|
|
if (nb_samples) {
|
|
|
|
ret = av_frame_get_buffer(frame, 0);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "Error allocating an audio buffer\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return frame;
|
2003-07-22 16:41:49 +02:00
|
|
|
}
|
|
|
|
|
2014-06-24 08:56:27 +02:00
|
|
|
static void open_audio(AVFormatContext *oc, OutputStream *ost)
|
2003-07-22 16:41:49 +02:00
|
|
|
{
|
|
|
|
AVCodecContext *c;
|
2016-02-10 14:13:39 +01:00
|
|
|
int nb_samples, ret;
|
2003-07-22 16:41:49 +02:00
|
|
|
|
2016-02-10 14:13:39 +01:00
|
|
|
c = ost->enc;
|
2003-07-22 16:41:49 +02:00
|
|
|
|
2003-07-22 14:46:15 +02:00
|
|
|
/* open it */
|
2012-01-28 20:12:45 +01:00
|
|
|
if (avcodec_open2(c, NULL, NULL) < 0) {
|
2003-07-22 14:46:15 +02:00
|
|
|
fprintf(stderr, "could not open codec\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* init signal generator */
|
2014-06-24 08:56:27 +02:00
|
|
|
ost->t = 0;
|
|
|
|
ost->tincr = 2 * M_PI * 110.0 / c->sample_rate;
|
2003-07-22 16:41:49 +02:00
|
|
|
/* increment frequency by 110 Hz per second */
|
2014-06-24 08:56:27 +02:00
|
|
|
ost->tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
|
2003-07-22 14:46:15 +02:00
|
|
|
|
2015-07-07 02:41:27 +02:00
|
|
|
if (c->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE)
|
2014-07-24 19:47:26 +02:00
|
|
|
nb_samples = 10000;
|
2012-02-24 08:59:38 +01:00
|
|
|
else
|
2014-07-24 19:47:26 +02:00
|
|
|
nb_samples = c->frame_size;
|
2014-06-24 09:02:25 +02:00
|
|
|
|
2014-07-24 19:47:26 +02:00
|
|
|
ost->frame = alloc_audio_frame(c->sample_fmt, c->channel_layout,
|
|
|
|
c->sample_rate, nb_samples);
|
|
|
|
ost->tmp_frame = alloc_audio_frame(AV_SAMPLE_FMT_S16, AV_CH_LAYOUT_STEREO,
|
|
|
|
44100, nb_samples);
|
2016-02-10 14:13:39 +01:00
|
|
|
|
|
|
|
/* copy the stream parameters to the muxer */
|
|
|
|
ret = avcodec_parameters_from_context(ost->st->codecpar, c);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "Could not copy the stream parameters\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
|
|
|
|
* 'nb_channels' channels. */
|
2014-06-24 10:52:26 +02:00
|
|
|
static AVFrame *get_audio_frame(OutputStream *ost)
|
2003-08-08 20:03:31 +02:00
|
|
|
{
|
2014-07-24 19:47:26 +02:00
|
|
|
AVFrame *frame = ost->tmp_frame;
|
|
|
|
int j, i, v;
|
|
|
|
int16_t *q = (int16_t*)frame->data[0];
|
2014-06-24 10:52:26 +02:00
|
|
|
|
|
|
|
/* check if we want to generate more frames */
|
2016-02-10 14:13:39 +01:00
|
|
|
if (av_compare_ts(ost->next_pts, ost->enc->time_base,
|
2014-06-24 10:52:26 +02:00
|
|
|
STREAM_DURATION, (AVRational){ 1, 1 }) >= 0)
|
|
|
|
return NULL;
|
2014-06-24 07:51:18 +02:00
|
|
|
|
2003-08-08 20:03:31 +02:00
|
|
|
|
2014-07-24 19:47:26 +02:00
|
|
|
for (j = 0; j < frame->nb_samples; j++) {
|
2014-06-24 08:56:27 +02:00
|
|
|
v = (int)(sin(ost->t) * 10000);
|
2016-02-10 14:13:39 +01:00
|
|
|
for (i = 0; i < ost->enc->channels; i++)
|
2003-08-08 20:03:31 +02:00
|
|
|
*q++ = v;
|
2014-06-24 08:56:27 +02:00
|
|
|
ost->t += ost->tincr;
|
|
|
|
ost->tincr += ost->tincr2;
|
2003-08-08 20:03:31 +02:00
|
|
|
}
|
2014-06-24 10:52:26 +02:00
|
|
|
|
2014-07-24 19:47:26 +02:00
|
|
|
return frame;
|
2003-08-08 20:03:31 +02:00
|
|
|
}
|
|
|
|
|
2014-07-24 19:47:26 +02:00
|
|
|
/* if a frame is provided, send it to the encoder, otherwise flush the encoder;
|
2014-06-24 10:52:26 +02:00
|
|
|
* return 1 when encoding is finished, 0 otherwise
|
|
|
|
*/
|
2014-07-24 19:47:26 +02:00
|
|
|
static int encode_audio_frame(AVFormatContext *oc, OutputStream *ost,
|
|
|
|
AVFrame *frame)
|
2003-07-22 14:46:15 +02:00
|
|
|
{
|
2016-09-22 09:32:08 +02:00
|
|
|
int ret;
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2016-09-22 09:32:08 +02:00
|
|
|
ret = avcodec_send_frame(ost->enc, frame);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "Error submitting a frame for encoding\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2004-05-29 04:06:32 +02:00
|
|
|
|
2016-09-22 09:32:08 +02:00
|
|
|
while (ret >= 0) {
|
|
|
|
AVPacket pkt = { 0 }; // data and size must be 0;
|
2003-07-22 14:46:15 +02:00
|
|
|
|
2016-09-22 09:32:08 +02:00
|
|
|
av_init_packet(&pkt);
|
2014-07-24 19:47:26 +02:00
|
|
|
|
2016-09-22 09:32:08 +02:00
|
|
|
ret = avcodec_receive_packet(ost->enc, &pkt);
|
|
|
|
if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF) {
|
|
|
|
fprintf(stderr, "Error encoding a video frame\n");
|
2014-06-24 10:52:26 +02:00
|
|
|
exit(1);
|
2016-09-22 09:32:08 +02:00
|
|
|
} else if (ret >= 0) {
|
|
|
|
av_packet_rescale_ts(&pkt, ost->enc->time_base, ost->st->time_base);
|
|
|
|
pkt.stream_index = ost->st->index;
|
|
|
|
|
|
|
|
/* Write the compressed frame to the media file. */
|
|
|
|
ret = av_interleaved_write_frame(oc, &pkt);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "Error while writing video frame\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2014-06-24 10:52:26 +02:00
|
|
|
}
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
2014-06-24 10:52:26 +02:00
|
|
|
|
2016-09-22 09:32:08 +02:00
|
|
|
return ret == AVERROR_EOF;
|
2003-07-22 16:41:49 +02:00
|
|
|
}
|
|
|
|
|
2014-07-24 19:47:26 +02:00
|
|
|
/*
|
|
|
|
* encode one audio frame and send it to the muxer
|
|
|
|
* return 1 when encoding is finished, 0 otherwise
|
|
|
|
*/
|
|
|
|
static int process_audio_stream(AVFormatContext *oc, OutputStream *ost)
|
|
|
|
{
|
|
|
|
AVFrame *frame;
|
|
|
|
int got_output = 0;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
frame = get_audio_frame(ost);
|
|
|
|
got_output |= !!frame;
|
|
|
|
|
|
|
|
/* feed the data to lavr */
|
|
|
|
if (frame) {
|
|
|
|
ret = avresample_convert(ost->avr, NULL, 0, 0,
|
|
|
|
frame->extended_data, frame->linesize[0],
|
|
|
|
frame->nb_samples);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "Error feeding audio data to the resampler\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
while ((frame && avresample_available(ost->avr) >= ost->frame->nb_samples) ||
|
|
|
|
(!frame && avresample_get_out_samples(ost->avr, 0))) {
|
|
|
|
/* when we pass a frame to the encoder, it may keep a reference to it
|
|
|
|
* internally;
|
|
|
|
* make sure we do not overwrite it here
|
|
|
|
*/
|
|
|
|
ret = av_frame_make_writable(ost->frame);
|
|
|
|
if (ret < 0)
|
|
|
|
exit(1);
|
|
|
|
|
|
|
|
/* the difference between the two avresample calls here is that the
|
|
|
|
* first one just reads the already converted data that is buffered in
|
|
|
|
* the lavr output buffer, while the second one also flushes the
|
|
|
|
* resampler */
|
|
|
|
if (frame) {
|
|
|
|
ret = avresample_read(ost->avr, ost->frame->extended_data,
|
|
|
|
ost->frame->nb_samples);
|
|
|
|
} else {
|
|
|
|
ret = avresample_convert(ost->avr, ost->frame->extended_data,
|
|
|
|
ost->frame->linesize[0], ost->frame->nb_samples,
|
|
|
|
NULL, 0, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "Error while resampling\n");
|
|
|
|
exit(1);
|
|
|
|
} else if (frame && ret != ost->frame->nb_samples) {
|
|
|
|
fprintf(stderr, "Too few samples returned from lavr\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
ost->frame->nb_samples = ret;
|
|
|
|
|
|
|
|
ost->frame->pts = ost->next_pts;
|
|
|
|
ost->next_pts += ost->frame->nb_samples;
|
|
|
|
|
|
|
|
got_output |= encode_audio_frame(oc, ost, ret ? ost->frame : NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
return !got_output;
|
|
|
|
}
|
|
|
|
|
2003-07-22 14:46:15 +02:00
|
|
|
/**************************************************************/
|
|
|
|
/* video output */
|
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Add a video output stream. */
|
2014-06-21 17:17:40 +02:00
|
|
|
static void add_video_stream(OutputStream *ost, AVFormatContext *oc,
|
|
|
|
enum AVCodecID codec_id)
|
2003-07-22 14:46:15 +02:00
|
|
|
{
|
|
|
|
AVCodecContext *c;
|
2012-01-28 20:12:45 +01:00
|
|
|
AVCodec *codec;
|
|
|
|
|
|
|
|
/* find the video encoder */
|
|
|
|
codec = avcodec_find_encoder(codec_id);
|
|
|
|
if (!codec) {
|
|
|
|
fprintf(stderr, "codec not found\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2003-07-22 14:46:15 +02:00
|
|
|
|
2016-02-10 14:13:39 +01:00
|
|
|
ost->st = avformat_new_stream(oc, NULL);
|
2014-06-21 17:17:40 +02:00
|
|
|
if (!ost->st) {
|
2003-07-22 14:46:15 +02:00
|
|
|
fprintf(stderr, "Could not alloc stream\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2016-02-10 14:13:39 +01:00
|
|
|
c = avcodec_alloc_context3(codec);
|
|
|
|
if (!c) {
|
|
|
|
fprintf(stderr, "Could not alloc an encoding context\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
ost->enc = c;
|
2003-07-22 14:46:15 +02:00
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Put sample parameters. */
|
2003-07-22 14:46:15 +02:00
|
|
|
c->bit_rate = 400000;
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Resolution must be a multiple of two. */
|
|
|
|
c->width = 352;
|
|
|
|
c->height = 288;
|
|
|
|
/* timebase: This is the fundamental unit of time (in seconds) in terms
|
|
|
|
* of which frame timestamps are represented. For fixed-fps content,
|
|
|
|
* timebase should be 1/framerate and timestamp increments should be
|
|
|
|
* identical to 1. */
|
2014-07-23 13:09:16 +02:00
|
|
|
ost->st->time_base = (AVRational){ 1, STREAM_FRAME_RATE };
|
|
|
|
c->time_base = ost->st->time_base;
|
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
c->gop_size = 12; /* emit one intra frame every twelve frames at most */
|
|
|
|
c->pix_fmt = STREAM_PIX_FMT;
|
2012-08-05 11:11:04 +02:00
|
|
|
if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
|
2016-04-27 19:45:23 +02:00
|
|
|
/* just for testing, we also add B-frames */
|
2003-09-11 01:09:30 +02:00
|
|
|
c->max_b_frames = 2;
|
|
|
|
}
|
2012-08-05 11:11:04 +02:00
|
|
|
if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
|
2007-06-12 11:29:25 +02:00
|
|
|
/* Needed to avoid using macroblocks in which some coeffs overflow.
|
2012-03-30 02:27:05 +02:00
|
|
|
* This does not happen with normal video, it just happens here as
|
|
|
|
* the motion of the chroma plane does not match the luma plane. */
|
|
|
|
c->mb_decision = 2;
|
2004-01-06 22:16:59 +01:00
|
|
|
}
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Some formats want stream headers to be separate. */
|
|
|
|
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
|
2015-06-29 21:59:37 +02:00
|
|
|
c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
|
2003-07-22 16:41:49 +02:00
|
|
|
}
|
|
|
|
|
2012-10-06 12:10:34 +02:00
|
|
|
static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)
|
2003-07-22 16:41:49 +02:00
|
|
|
{
|
|
|
|
AVFrame *picture;
|
2014-06-16 13:20:51 +02:00
|
|
|
int ret;
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2013-11-09 10:05:22 +01:00
|
|
|
picture = av_frame_alloc();
|
2003-07-22 16:41:49 +02:00
|
|
|
if (!picture)
|
|
|
|
return NULL;
|
2014-06-16 13:20:51 +02:00
|
|
|
|
|
|
|
picture->format = pix_fmt;
|
|
|
|
picture->width = width;
|
|
|
|
picture->height = height;
|
|
|
|
|
|
|
|
/* allocate the buffers for the frame data */
|
|
|
|
ret = av_frame_get_buffer(picture, 32);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "Could not allocate frame data.\n");
|
|
|
|
exit(1);
|
2003-07-22 16:41:49 +02:00
|
|
|
}
|
2014-06-16 13:20:51 +02:00
|
|
|
|
2003-07-22 16:41:49 +02:00
|
|
|
return picture;
|
|
|
|
}
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2014-06-21 17:17:40 +02:00
|
|
|
static void open_video(AVFormatContext *oc, OutputStream *ost)
|
2003-07-22 16:41:49 +02:00
|
|
|
{
|
|
|
|
AVCodecContext *c;
|
2016-02-10 14:13:39 +01:00
|
|
|
int ret;
|
2003-07-22 16:41:49 +02:00
|
|
|
|
2016-02-10 14:13:39 +01:00
|
|
|
c = ost->enc;
|
2003-07-22 16:41:49 +02:00
|
|
|
|
|
|
|
/* open the codec */
|
2012-01-28 20:12:45 +01:00
|
|
|
if (avcodec_open2(c, NULL, NULL) < 0) {
|
2003-07-22 14:46:15 +02:00
|
|
|
fprintf(stderr, "could not open codec\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Allocate the encoded raw picture. */
|
2014-06-21 17:17:40 +02:00
|
|
|
ost->frame = alloc_picture(c->pix_fmt, c->width, c->height);
|
|
|
|
if (!ost->frame) {
|
2003-07-22 16:41:49 +02:00
|
|
|
fprintf(stderr, "Could not allocate picture\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2003-07-22 14:46:15 +02:00
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* If the output format is not YUV420P, then a temporary YUV420P
|
|
|
|
* picture is needed too. It is then converted to the required
|
|
|
|
* output format. */
|
2014-06-21 17:17:40 +02:00
|
|
|
ost->tmp_frame = NULL;
|
2012-10-06 12:10:34 +02:00
|
|
|
if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
|
2014-06-21 17:17:40 +02:00
|
|
|
ost->tmp_frame = alloc_picture(AV_PIX_FMT_YUV420P, c->width, c->height);
|
|
|
|
if (!ost->tmp_frame) {
|
2003-07-22 16:41:49 +02:00
|
|
|
fprintf(stderr, "Could not allocate temporary picture\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
}
|
2016-02-10 14:13:39 +01:00
|
|
|
|
|
|
|
/* copy the stream parameters to the muxer */
|
|
|
|
ret = avcodec_parameters_from_context(ost->st->codecpar, c);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "Could not copy the stream parameters\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2003-07-22 16:41:49 +02:00
|
|
|
}
|
2003-07-22 14:46:15 +02:00
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Prepare a dummy image. */
|
|
|
|
static void fill_yuv_image(AVFrame *pict, int frame_index,
|
|
|
|
int width, int height)
|
2003-07-22 14:46:15 +02:00
|
|
|
{
|
2014-06-16 13:20:51 +02:00
|
|
|
int x, y, i, ret;
|
|
|
|
|
|
|
|
/* when we pass a frame to the encoder, it may keep a reference to it
|
|
|
|
* internally;
|
|
|
|
* make sure we do not overwrite it here
|
|
|
|
*/
|
|
|
|
ret = av_frame_make_writable(pict);
|
|
|
|
if (ret < 0)
|
|
|
|
exit(1);
|
2003-07-22 16:41:49 +02:00
|
|
|
|
|
|
|
i = frame_index;
|
2003-07-22 14:46:15 +02:00
|
|
|
|
|
|
|
/* Y */
|
2012-03-30 02:27:05 +02:00
|
|
|
for (y = 0; y < height; y++)
|
|
|
|
for (x = 0; x < width; x++)
|
2003-07-22 16:41:49 +02:00
|
|
|
pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2003-07-22 14:46:15 +02:00
|
|
|
/* Cb and Cr */
|
2012-03-30 02:27:05 +02:00
|
|
|
for (y = 0; y < height / 2; y++) {
|
|
|
|
for (x = 0; x < width / 2; x++) {
|
2003-07-22 16:41:49 +02:00
|
|
|
pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
|
|
|
|
pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
|
|
|
}
|
2003-07-22 16:41:49 +02:00
|
|
|
}
|
2003-07-22 14:46:15 +02:00
|
|
|
|
2014-06-24 10:52:26 +02:00
|
|
|
static AVFrame *get_video_frame(OutputStream *ost)
|
2003-07-22 16:41:49 +02:00
|
|
|
{
|
2016-02-10 14:13:39 +01:00
|
|
|
AVCodecContext *c = ost->enc;
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2014-06-24 10:52:26 +02:00
|
|
|
/* check if we want to generate more frames */
|
2016-02-10 14:13:39 +01:00
|
|
|
if (av_compare_ts(ost->next_pts, c->time_base,
|
2014-06-24 10:52:26 +02:00
|
|
|
STREAM_DURATION, (AVRational){ 1, 1 }) >= 0)
|
|
|
|
return NULL;
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2014-06-24 10:52:26 +02:00
|
|
|
if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
|
|
|
|
/* as we only generate a YUV420P picture, we must convert it
|
|
|
|
* to the codec pixel format if needed */
|
|
|
|
if (!ost->sws_ctx) {
|
|
|
|
ost->sws_ctx = sws_getContext(c->width, c->height,
|
|
|
|
AV_PIX_FMT_YUV420P,
|
|
|
|
c->width, c->height,
|
|
|
|
c->pix_fmt,
|
|
|
|
SCALE_FLAGS, NULL, NULL, NULL);
|
2014-06-24 10:21:07 +02:00
|
|
|
if (!ost->sws_ctx) {
|
2014-06-24 10:52:26 +02:00
|
|
|
fprintf(stderr,
|
|
|
|
"Cannot initialize the conversion context\n");
|
|
|
|
exit(1);
|
2006-08-03 18:55:36 +02:00
|
|
|
}
|
2003-09-11 01:09:30 +02:00
|
|
|
}
|
2014-06-24 10:52:26 +02:00
|
|
|
fill_yuv_image(ost->tmp_frame, ost->next_pts, c->width, c->height);
|
|
|
|
sws_scale(ost->sws_ctx, ost->tmp_frame->data, ost->tmp_frame->linesize,
|
|
|
|
0, c->height, ost->frame->data, ost->frame->linesize);
|
|
|
|
} else {
|
|
|
|
fill_yuv_image(ost->frame, ost->next_pts, c->width, c->height);
|
2003-07-22 16:41:49 +02:00
|
|
|
}
|
|
|
|
|
2014-06-24 10:52:26 +02:00
|
|
|
ost->frame->pts = ost->next_pts++;
|
|
|
|
|
|
|
|
return ost->frame;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* encode one video frame and send it to the muxer
|
|
|
|
* return 1 when encoding is finished, 0 otherwise
|
|
|
|
*/
|
|
|
|
static int write_video_frame(AVFormatContext *oc, OutputStream *ost)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
AVCodecContext *c;
|
|
|
|
AVFrame *frame;
|
|
|
|
|
2016-02-10 14:13:39 +01:00
|
|
|
c = ost->enc;
|
2014-06-24 10:52:26 +02:00
|
|
|
|
|
|
|
frame = get_video_frame(ost);
|
|
|
|
|
2015-10-12 16:06:07 +02:00
|
|
|
/* encode the image */
|
2016-09-22 09:32:08 +02:00
|
|
|
ret = avcodec_send_frame(c, frame);
|
2015-10-12 16:06:07 +02:00
|
|
|
if (ret < 0) {
|
2016-09-22 09:32:08 +02:00
|
|
|
fprintf(stderr, "Error submitting a frame for encoding\n");
|
2015-10-12 16:06:07 +02:00
|
|
|
exit(1);
|
|
|
|
}
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2016-09-22 09:32:08 +02:00
|
|
|
while (ret >= 0) {
|
|
|
|
AVPacket pkt = { 0 };
|
2014-06-24 10:52:26 +02:00
|
|
|
|
2016-09-22 09:32:08 +02:00
|
|
|
av_init_packet(&pkt);
|
2015-10-12 16:06:07 +02:00
|
|
|
|
2016-09-22 09:32:08 +02:00
|
|
|
ret = avcodec_receive_packet(c, &pkt);
|
|
|
|
if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF) {
|
|
|
|
fprintf(stderr, "Error encoding a video frame\n");
|
|
|
|
exit(1);
|
|
|
|
} else if (ret >= 0) {
|
|
|
|
av_packet_rescale_ts(&pkt, c->time_base, ost->st->time_base);
|
|
|
|
pkt.stream_index = ost->st->index;
|
|
|
|
|
|
|
|
/* Write the compressed frame to the media file. */
|
|
|
|
ret = av_interleaved_write_frame(oc, &pkt);
|
|
|
|
if (ret < 0) {
|
|
|
|
fprintf(stderr, "Error while writing video frame\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
}
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
2014-06-24 10:52:26 +02:00
|
|
|
|
2016-09-22 09:32:08 +02:00
|
|
|
return ret == AVERROR_EOF;
|
2003-07-22 16:41:49 +02:00
|
|
|
}
|
|
|
|
|
2014-06-24 09:02:25 +02:00
|
|
|
static void close_stream(AVFormatContext *oc, OutputStream *ost)
|
2003-07-22 16:41:49 +02:00
|
|
|
{
|
2016-02-10 14:13:39 +01:00
|
|
|
avcodec_free_context(&ost->enc);
|
2014-06-21 17:17:40 +02:00
|
|
|
av_frame_free(&ost->frame);
|
|
|
|
av_frame_free(&ost->tmp_frame);
|
2014-06-24 10:21:07 +02:00
|
|
|
sws_freeContext(ost->sws_ctx);
|
2014-07-24 19:47:26 +02:00
|
|
|
avresample_free(&ost->avr);
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/**************************************************************/
|
|
|
|
/* media file output */
|
|
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
|
|
{
|
2014-06-24 09:02:25 +02:00
|
|
|
OutputStream video_st = { 0 }, audio_st = { 0 };
|
2003-07-22 14:46:15 +02:00
|
|
|
const char *filename;
|
|
|
|
AVOutputFormat *fmt;
|
|
|
|
AVFormatContext *oc;
|
2014-06-24 08:56:27 +02:00
|
|
|
int have_video = 0, have_audio = 0;
|
2014-06-24 10:52:26 +02:00
|
|
|
int encode_video = 0, encode_audio = 0;
|
2003-07-22 16:41:49 +02:00
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Initialize libavcodec, and register all codecs and formats. */
|
2003-07-22 14:46:15 +02:00
|
|
|
av_register_all();
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2003-07-22 14:46:15 +02:00
|
|
|
if (argc != 2) {
|
|
|
|
printf("usage: %s output_file\n"
|
2003-07-22 16:41:49 +02:00
|
|
|
"API example program to output a media file with libavformat.\n"
|
|
|
|
"The output format is automatically guessed according to the file extension.\n"
|
|
|
|
"Raw images can also be output by using '%%d' in the filename\n"
|
2003-07-22 14:46:15 +02:00
|
|
|
"\n", argv[0]);
|
2011-09-21 18:46:56 +02:00
|
|
|
return 1;
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2003-07-22 14:46:15 +02:00
|
|
|
filename = argv[1];
|
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Autodetect the output format from the name. default is MPEG. */
|
2010-01-23 00:09:08 +01:00
|
|
|
fmt = av_guess_format(NULL, filename, NULL);
|
2003-07-22 14:46:15 +02:00
|
|
|
if (!fmt) {
|
|
|
|
printf("Could not deduce output format from file extension: using MPEG.\n");
|
2010-01-23 00:09:08 +01:00
|
|
|
fmt = av_guess_format("mpeg", NULL, NULL);
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
|
|
|
if (!fmt) {
|
|
|
|
fprintf(stderr, "Could not find suitable output format\n");
|
2011-09-21 18:46:56 +02:00
|
|
|
return 1;
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Allocate the output media context. */
|
2009-02-08 09:27:26 +01:00
|
|
|
oc = avformat_alloc_context();
|
2003-07-22 14:46:15 +02:00
|
|
|
if (!oc) {
|
|
|
|
fprintf(stderr, "Memory error\n");
|
2011-09-21 18:46:56 +02:00
|
|
|
return 1;
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
|
|
|
oc->oformat = fmt;
|
2003-07-22 16:41:49 +02:00
|
|
|
snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
|
2003-07-22 14:46:15 +02:00
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Add the audio and video streams using the default format codecs
|
|
|
|
* and initialize the codecs. */
|
2012-08-05 11:11:04 +02:00
|
|
|
if (fmt->video_codec != AV_CODEC_ID_NONE) {
|
2014-06-21 17:17:40 +02:00
|
|
|
add_video_stream(&video_st, oc, fmt->video_codec);
|
|
|
|
have_video = 1;
|
2014-06-24 10:52:26 +02:00
|
|
|
encode_video = 1;
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
2012-08-05 11:11:04 +02:00
|
|
|
if (fmt->audio_codec != AV_CODEC_ID_NONE) {
|
2014-06-24 08:56:27 +02:00
|
|
|
add_audio_stream(&audio_st, oc, fmt->audio_codec);
|
|
|
|
have_audio = 1;
|
2014-06-24 10:52:26 +02:00
|
|
|
encode_audio = 1;
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Now that all the parameters are set, we can open the audio and
|
|
|
|
* video codecs and allocate the necessary encode buffers. */
|
2014-06-21 17:17:40 +02:00
|
|
|
if (have_video)
|
|
|
|
open_video(oc, &video_st);
|
2014-06-24 08:56:27 +02:00
|
|
|
if (have_audio)
|
|
|
|
open_audio(oc, &audio_st);
|
2003-07-22 16:41:49 +02:00
|
|
|
|
2012-03-30 00:28:00 +02:00
|
|
|
av_dump_format(oc, 0, filename, 1);
|
|
|
|
|
2003-07-22 14:46:15 +02:00
|
|
|
/* open the output file, if needed */
|
|
|
|
if (!(fmt->flags & AVFMT_NOFILE)) {
|
2011-04-15 16:42:09 +02:00
|
|
|
if (avio_open(&oc->pb, filename, AVIO_FLAG_WRITE) < 0) {
|
2003-07-22 14:46:15 +02:00
|
|
|
fprintf(stderr, "Could not open '%s'\n", filename);
|
2011-09-21 18:46:56 +02:00
|
|
|
return 1;
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
|
|
|
}
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Write the stream header, if any. */
|
2012-02-19 10:34:40 +01:00
|
|
|
avformat_write_header(oc, NULL);
|
2005-12-17 19:14:38 +01:00
|
|
|
|
2014-06-24 10:52:26 +02:00
|
|
|
while (encode_video || encode_audio) {
|
|
|
|
/* select the stream to encode */
|
|
|
|
if (encode_video &&
|
2016-02-10 14:13:39 +01:00
|
|
|
(!encode_audio || av_compare_ts(video_st.next_pts, video_st.enc->time_base,
|
|
|
|
audio_st.next_pts, audio_st.enc->time_base) <= 0)) {
|
2014-06-24 10:52:26 +02:00
|
|
|
encode_video = !write_video_frame(oc, &video_st);
|
2003-07-22 14:46:15 +02:00
|
|
|
} else {
|
2014-07-24 19:47:26 +02:00
|
|
|
encode_audio = !process_audio_stream(oc, &audio_st);
|
2003-07-22 14:46:15 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Write the trailer, if any. The trailer must be written before you
|
|
|
|
* close the CodecContexts open when you wrote the header; otherwise
|
|
|
|
* av_write_trailer() may try to use memory that was freed on
|
|
|
|
* av_codec_close(). */
|
2009-02-18 07:49:32 +01:00
|
|
|
av_write_trailer(oc);
|
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
/* Close each codec. */
|
2014-06-21 17:17:40 +02:00
|
|
|
if (have_video)
|
2014-06-24 09:02:25 +02:00
|
|
|
close_stream(oc, &video_st);
|
2014-06-24 08:56:27 +02:00
|
|
|
if (have_audio)
|
2014-06-24 09:02:25 +02:00
|
|
|
close_stream(oc, &audio_st);
|
2003-07-22 14:46:15 +02:00
|
|
|
|
2012-03-30 02:27:05 +02:00
|
|
|
if (!(fmt->flags & AVFMT_NOFILE))
|
|
|
|
/* Close the output file. */
|
2011-02-21 22:45:20 +01:00
|
|
|
avio_close(oc->pb);
|
2003-07-22 14:46:15 +02:00
|
|
|
|
|
|
|
/* free the stream */
|
2014-06-24 11:10:57 +02:00
|
|
|
avformat_free_context(oc);
|
2003-07-22 14:46:15 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|