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diff --git a/libavformat/output-example.c b/libavformat/output-example.c
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-/*
- * Copyright (c) 2003 Fabrice Bellard
- *
- * 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:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * 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
- * THE SOFTWARE.
- */
-
-/**
- * @file
- * libavformat API example.
- *
- * @example libavformat/output-example.c
- * Output a media file in any supported libavformat format.
- * The default codecs are used.
- */
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <math.h>
-
-#include "libavutil/mathematics.h"
-#include "libavformat/avformat.h"
-#include "libswscale/swscale.h"
-
-/* 5 seconds stream duration */
-#define STREAM_DURATION 5.0
-#define STREAM_FRAME_RATE 25 /* 25 images/s */
-#define STREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
-#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */
-
-static int sws_flags = SWS_BICUBIC;
-
-/**************************************************************/
-/* audio output */
-
-static float t, tincr, tincr2;
-static int16_t *samples;
-static int audio_input_frame_size;
-
-/*
- * add an audio output stream
- */
-static AVStream *add_audio_stream(AVFormatContext *oc, enum AVCodecID codec_id)
-{
- AVCodecContext *c;
- AVStream *st;
- AVCodec *codec;
-
- /* find the audio encoder */
- codec = avcodec_find_encoder(codec_id);
- if (!codec) {
- fprintf(stderr, "codec not found\n");
- exit(1);
- }
-
- st = avformat_new_stream(oc, codec);
- if (!st) {
- fprintf(stderr, "Could not alloc stream\n");
- exit(1);
- }
-
- c = st->codec;
-
- /* put sample parameters */
- c->sample_fmt = AV_SAMPLE_FMT_S16;
- c->bit_rate = 64000;
- c->sample_rate = 44100;
- c->channels = 2;
-
- // some formats want stream headers to be separate
- if (oc->oformat->flags & AVFMT_GLOBALHEADER)
- c->flags |= CODEC_FLAG_GLOBAL_HEADER;
-
- return st;
-}
-
-static void open_audio(AVFormatContext *oc, AVStream *st)
-{
- AVCodecContext *c;
-
- c = st->codec;
-
- /* open it */
- if (avcodec_open2(c, NULL, NULL) < 0) {
- fprintf(stderr, "could not open codec\n");
- exit(1);
- }
-
- /* init signal generator */
- t = 0;
- tincr = 2 * M_PI * 110.0 / c->sample_rate;
- /* increment frequency by 110 Hz per second */
- tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
-
- if (c->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)
- audio_input_frame_size = 10000;
- else
- audio_input_frame_size = c->frame_size;
- samples = av_malloc(audio_input_frame_size *
- av_get_bytes_per_sample(c->sample_fmt) *
- c->channels);
-}
-
-/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
- * 'nb_channels' channels. */
-static void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
-{
- int j, i, v;
- int16_t *q;
-
- q = samples;
- for (j = 0; j < frame_size; j++) {
- v = (int)(sin(t) * 10000);
- for (i = 0; i < nb_channels; i++)
- *q++ = v;
- t += tincr;
- tincr += tincr2;
- }
-}
-
-static void write_audio_frame(AVFormatContext *oc, AVStream *st)
-{
- AVCodecContext *c;
- AVPacket pkt = { 0 }; // data and size must be 0;
- AVFrame *frame = avcodec_alloc_frame();
- int got_packet;
-
- av_init_packet(&pkt);
- c = st->codec;
-
- get_audio_frame(samples, audio_input_frame_size, c->channels);
- frame->nb_samples = audio_input_frame_size;
- avcodec_fill_audio_frame(frame, c->channels, c->sample_fmt,
- (uint8_t *)samples,
- audio_input_frame_size *
- av_get_bytes_per_sample(c->sample_fmt) *
- c->channels, 1);
-
- avcodec_encode_audio2(c, &pkt, frame, &got_packet);
- if (!got_packet)
- return;
-
- pkt.stream_index = st->index;
-
- /* Write the compressed frame to the media file. */
- if (av_interleaved_write_frame(oc, &pkt) != 0) {
- fprintf(stderr, "Error while writing audio frame\n");
- exit(1);
- }
- avcodec_free_frame(&frame);
-}
-
-static void close_audio(AVFormatContext *oc, AVStream *st)
-{
- avcodec_close(st->codec);
-
- av_free(samples);
-}
-
-/**************************************************************/
-/* video output */
-
-static AVFrame *picture, *tmp_picture;
-static int frame_count;
-
-/* Add a video output stream. */
-static AVStream *add_video_stream(AVFormatContext *oc, enum AVCodecID codec_id)
-{
- AVCodecContext *c;
- AVStream *st;
- AVCodec *codec;
-
- /* find the video encoder */
- codec = avcodec_find_encoder(codec_id);
- if (!codec) {
- fprintf(stderr, "codec not found\n");
- exit(1);
- }
-
- st = avformat_new_stream(oc, codec);
- if (!st) {
- fprintf(stderr, "Could not alloc stream\n");
- exit(1);
- }
-
- c = st->codec;
-
- /* Put sample parameters. */
- c->bit_rate = 400000;
- /* 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. */
- c->time_base.den = STREAM_FRAME_RATE;
- c->time_base.num = 1;
- c->gop_size = 12; /* emit one intra frame every twelve frames at most */
- c->pix_fmt = STREAM_PIX_FMT;
- if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
- /* just for testing, we also add B frames */
- c->max_b_frames = 2;
- }
- if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
- /* Needed to avoid using macroblocks in which some coeffs overflow.
- * 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;
- }
- /* Some formats want stream headers to be separate. */
- if (oc->oformat->flags & AVFMT_GLOBALHEADER)
- c->flags |= CODEC_FLAG_GLOBAL_HEADER;
-
- return st;
-}
-
-static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)
-{
- AVFrame *picture;
- uint8_t *picture_buf;
- int size;
-
- picture = avcodec_alloc_frame();
- if (!picture)
- return NULL;
- size = avpicture_get_size(pix_fmt, width, height);
- picture_buf = av_malloc(size);
- if (!picture_buf) {
- av_free(picture);
- return NULL;
- }
- avpicture_fill((AVPicture *)picture, picture_buf,
- pix_fmt, width, height);
- return picture;
-}
-
-static void open_video(AVFormatContext *oc, AVStream *st)
-{
- AVCodecContext *c;
-
- c = st->codec;
-
- /* open the codec */
- if (avcodec_open2(c, NULL, NULL) < 0) {
- fprintf(stderr, "could not open codec\n");
- exit(1);
- }
-
- /* Allocate the encoded raw picture. */
- picture = alloc_picture(c->pix_fmt, c->width, c->height);
- if (!picture) {
- fprintf(stderr, "Could not allocate picture\n");
- exit(1);
- }
-
- /* If the output format is not YUV420P, then a temporary YUV420P
- * picture is needed too. It is then converted to the required
- * output format. */
- tmp_picture = NULL;
- if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
- tmp_picture = alloc_picture(AV_PIX_FMT_YUV420P, c->width, c->height);
- if (!tmp_picture) {
- fprintf(stderr, "Could not allocate temporary picture\n");
- exit(1);
- }
- }
-}
-
-/* Prepare a dummy image. */
-static void fill_yuv_image(AVFrame *pict, int frame_index,
- int width, int height)
-{
- int x, y, i;
-
- i = frame_index;
-
- /* Y */
- for (y = 0; y < height; y++)
- for (x = 0; x < width; x++)
- pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
-
- /* Cb and Cr */
- for (y = 0; y < height / 2; y++) {
- for (x = 0; x < width / 2; x++) {
- pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
- pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
- }
- }
-}
-
-static void write_video_frame(AVFormatContext *oc, AVStream *st)
-{
- int ret;
- AVCodecContext *c;
- static struct SwsContext *img_convert_ctx;
-
- c = st->codec;
-
- if (frame_count >= STREAM_NB_FRAMES) {
- /* No more frames to compress. The codec has a latency of a few
- * frames if using B-frames, so we get the last frames by
- * passing the same picture again. */
- } else {
- 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 (img_convert_ctx == NULL) {
- img_convert_ctx = sws_getContext(c->width, c->height,
- AV_PIX_FMT_YUV420P,
- c->width, c->height,
- c->pix_fmt,
- sws_flags, NULL, NULL, NULL);
- if (img_convert_ctx == NULL) {
- fprintf(stderr,
- "Cannot initialize the conversion context\n");
- exit(1);
- }
- }
- fill_yuv_image(tmp_picture, frame_count, c->width, c->height);
- sws_scale(img_convert_ctx, tmp_picture->data, tmp_picture->linesize,
- 0, c->height, picture->data, picture->linesize);
- } else {
- fill_yuv_image(picture, frame_count, c->width, c->height);
- }
- }
-
- if (oc->oformat->flags & AVFMT_RAWPICTURE) {
- /* Raw video case - the API will change slightly in the near
- * future for that. */
- AVPacket pkt;
- av_init_packet(&pkt);
-
- pkt.flags |= AV_PKT_FLAG_KEY;
- pkt.stream_index = st->index;
- pkt.data = (uint8_t *)picture;
- pkt.size = sizeof(AVPicture);
-
- ret = av_interleaved_write_frame(oc, &pkt);
- } else {
- AVPacket pkt = { 0 };
- int got_packet;
- av_init_packet(&pkt);
-
- /* encode the image */
- ret = avcodec_encode_video2(c, &pkt, picture, &got_packet);
- /* If size is zero, it means the image was buffered. */
- if (!ret && got_packet && pkt.size) {
- if (pkt.pts != AV_NOPTS_VALUE) {
- pkt.pts = av_rescale_q(pkt.pts,
- c->time_base, st->time_base);
- }
- if (pkt.dts != AV_NOPTS_VALUE) {
- pkt.dts = av_rescale_q(pkt.dts,
- c->time_base, st->time_base);
- }
- pkt.stream_index = st->index;
-
- /* Write the compressed frame to the media file. */
- ret = av_interleaved_write_frame(oc, &pkt);
- } else {
- ret = 0;
- }
- }
- if (ret != 0) {
- fprintf(stderr, "Error while writing video frame\n");
- exit(1);
- }
- frame_count++;
-}
-
-static void close_video(AVFormatContext *oc, AVStream *st)
-{
- avcodec_close(st->codec);
- av_free(picture->data[0]);
- av_free(picture);
- if (tmp_picture) {
- av_free(tmp_picture->data[0]);
- av_free(tmp_picture);
- }
-}
-
-/**************************************************************/
-/* media file output */
-
-int main(int argc, char **argv)
-{
- const char *filename;
- AVOutputFormat *fmt;
- AVFormatContext *oc;
- AVStream *audio_st, *video_st;
- double audio_pts, video_pts;
- int i;
-
- /* Initialize libavcodec, and register all codecs and formats. */
- av_register_all();
-
- if (argc != 2) {
- printf("usage: %s output_file\n"
- "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"
- "\n", argv[0]);
- return 1;
- }
-
- filename = argv[1];
-
- /* Autodetect the output format from the name. default is MPEG. */
- fmt = av_guess_format(NULL, filename, NULL);
- if (!fmt) {
- printf("Could not deduce output format from file extension: using MPEG.\n");
- fmt = av_guess_format("mpeg", NULL, NULL);
- }
- if (!fmt) {
- fprintf(stderr, "Could not find suitable output format\n");
- return 1;
- }
-
- /* Allocate the output media context. */
- oc = avformat_alloc_context();
- if (!oc) {
- fprintf(stderr, "Memory error\n");
- return 1;
- }
- oc->oformat = fmt;
- snprintf(oc->filename, sizeof(oc->filename), "%s", filename);
-
- /* Add the audio and video streams using the default format codecs
- * and initialize the codecs. */
- video_st = NULL;
- audio_st = NULL;
- if (fmt->video_codec != AV_CODEC_ID_NONE) {
- video_st = add_video_stream(oc, fmt->video_codec);
- }
- if (fmt->audio_codec != AV_CODEC_ID_NONE) {
- audio_st = add_audio_stream(oc, fmt->audio_codec);
- }
-
- /* Now that all the parameters are set, we can open the audio and
- * video codecs and allocate the necessary encode buffers. */
- if (video_st)
- open_video(oc, video_st);
- if (audio_st)
- open_audio(oc, audio_st);
-
- av_dump_format(oc, 0, filename, 1);
-
- /* open the output file, if needed */
- if (!(fmt->flags & AVFMT_NOFILE)) {
- if (avio_open(&oc->pb, filename, AVIO_FLAG_WRITE) < 0) {
- fprintf(stderr, "Could not open '%s'\n", filename);
- return 1;
- }
- }
-
- /* Write the stream header, if any. */
- avformat_write_header(oc, NULL);
-
- for (;;) {
- /* Compute current audio and video time. */
- if (audio_st)
- audio_pts = (double)audio_st->pts.val * audio_st->time_base.num / audio_st->time_base.den;
- else
- audio_pts = 0.0;
-
- if (video_st)
- video_pts = (double)video_st->pts.val * video_st->time_base.num /
- video_st->time_base.den;
- else
- video_pts = 0.0;
-
- if ((!audio_st || audio_pts >= STREAM_DURATION) &&
- (!video_st || video_pts >= STREAM_DURATION))
- break;
-
- /* write interleaved audio and video frames */
- if (!video_st || (video_st && audio_st && audio_pts < video_pts)) {
- write_audio_frame(oc, audio_st);
- } else {
- write_video_frame(oc, video_st);
- }
- }
-
- /* 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(). */
- av_write_trailer(oc);
-
- /* Close each codec. */
- if (video_st)
- close_video(oc, video_st);
- if (audio_st)
- close_audio(oc, audio_st);
-
- /* Free the streams. */
- for (i = 0; i < oc->nb_streams; i++) {
- av_freep(&oc->streams[i]->codec);
- av_freep(&oc->streams[i]);
- }
-
- if (!(fmt->flags & AVFMT_NOFILE))
- /* Close the output file. */
- avio_close(oc->pb);
-
- /* free the stream */
- av_free(oc);
-
- return 0;
-}
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