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diff --git a/doc/examples/output.c b/doc/examples/output.c
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@@ -1,663 +0,0 @@
-/*
- * 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 output.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/channel_layout.h"
-#include "libavutil/mathematics.h"
-#include "libavutil/opt.h"
-#include "libavformat/avformat.h"
-#include "libavresample/avresample.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 */
-
-#define SCALE_FLAGS SWS_BICUBIC
-
-// a wrapper around a single output AVStream
-typedef struct OutputStream {
- AVStream *st;
-
- /* pts of the next frame that will be generated */
- int64_t next_pts;
-
- AVFrame *frame;
- AVFrame *tmp_frame;
-
- float t, tincr, tincr2;
-
- struct SwsContext *sws_ctx;
- AVAudioResampleContext *avr;
-} OutputStream;
-
-/**************************************************************/
-/* audio output */
-
-/*
- * add an audio output stream
- */
-static void add_audio_stream(OutputStream *ost, AVFormatContext *oc,
- enum AVCodecID codec_id)
-{
- AVCodecContext *c;
- AVCodec *codec;
- int ret;
-
- /* find the audio encoder */
- codec = avcodec_find_encoder(codec_id);
- if (!codec) {
- fprintf(stderr, "codec not found\n");
- exit(1);
- }
-
- ost->st = avformat_new_stream(oc, codec);
- if (!ost->st) {
- fprintf(stderr, "Could not alloc stream\n");
- exit(1);
- }
-
- c = ost->st->codec;
-
- /* put sample parameters */
- 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;
-
- ost->st->time_base = (AVRational){ 1, c->sample_rate };
-
- // some formats want stream headers to be separate
- if (oc->oformat->flags & AVFMT_GLOBALHEADER)
- c->flags |= CODEC_FLAG_GLOBAL_HEADER;
-
- /* 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;
-}
-
-static void open_audio(AVFormatContext *oc, OutputStream *ost)
-{
- AVCodecContext *c;
- int nb_samples;
-
- c = ost->st->codec;
-
- /* open it */
- if (avcodec_open2(c, NULL, NULL) < 0) {
- fprintf(stderr, "could not open codec\n");
- exit(1);
- }
-
- /* init signal generator */
- ost->t = 0;
- ost->tincr = 2 * M_PI * 110.0 / c->sample_rate;
- /* increment frequency by 110 Hz per second */
- ost->tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
-
- if (c->codec->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE)
- nb_samples = 10000;
- else
- nb_samples = c->frame_size;
-
- 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);
-}
-
-/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
- * 'nb_channels' channels. */
-static AVFrame *get_audio_frame(OutputStream *ost)
-{
- AVFrame *frame = ost->tmp_frame;
- int j, i, v;
- int16_t *q = (int16_t*)frame->data[0];
-
- /* check if we want to generate more frames */
- if (av_compare_ts(ost->next_pts, ost->st->codec->time_base,
- STREAM_DURATION, (AVRational){ 1, 1 }) >= 0)
- return NULL;
-
-
- for (j = 0; j < frame->nb_samples; j++) {
- v = (int)(sin(ost->t) * 10000);
- for (i = 0; i < ost->st->codec->channels; i++)
- *q++ = v;
- ost->t += ost->tincr;
- ost->tincr += ost->tincr2;
- }
-
- return frame;
-}
-
-/* if a frame is provided, send it to the encoder, otherwise flush the encoder;
- * return 1 when encoding is finished, 0 otherwise
- */
-static int encode_audio_frame(AVFormatContext *oc, OutputStream *ost,
- AVFrame *frame)
-{
- AVPacket pkt = { 0 }; // data and size must be 0;
- int got_packet;
-
- av_init_packet(&pkt);
- avcodec_encode_audio2(ost->st->codec, &pkt, frame, &got_packet);
-
- if (got_packet) {
- pkt.stream_index = ost->st->index;
-
- av_packet_rescale_ts(&pkt, ost->st->codec->time_base, ost->st->time_base);
-
- /* 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);
- }
- }
-
- return (frame || got_packet) ? 0 : 1;
-}
-
-/*
- * 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;
-}
-
-/**************************************************************/
-/* video output */
-
-/* Add a video output stream. */
-static void add_video_stream(OutputStream *ost, AVFormatContext *oc,
- enum AVCodecID codec_id)
-{
- AVCodecContext *c;
- AVCodec *codec;
-
- /* find the video encoder */
- codec = avcodec_find_encoder(codec_id);
- if (!codec) {
- fprintf(stderr, "codec not found\n");
- exit(1);
- }
-
- ost->st = avformat_new_stream(oc, codec);
- if (!ost->st) {
- fprintf(stderr, "Could not alloc stream\n");
- exit(1);
- }
-
- c = ost->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. */
- ost->st->time_base = (AVRational){ 1, STREAM_FRAME_RATE };
- c->time_base = ost->st->time_base;
-
- 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;
-}
-
-static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)
-{
- AVFrame *picture;
- int ret;
-
- picture = av_frame_alloc();
- if (!picture)
- return NULL;
-
- 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);
- }
-
- return picture;
-}
-
-static void open_video(AVFormatContext *oc, OutputStream *ost)
-{
- AVCodecContext *c;
-
- c = ost->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. */
- ost->frame = alloc_picture(c->pix_fmt, c->width, c->height);
- if (!ost->frame) {
- 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. */
- ost->tmp_frame = NULL;
- if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
- ost->tmp_frame = alloc_picture(AV_PIX_FMT_YUV420P, c->width, c->height);
- if (!ost->tmp_frame) {
- 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, 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);
-
- 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 AVFrame *get_video_frame(OutputStream *ost)
-{
- AVCodecContext *c = ost->st->codec;
-
- /* check if we want to generate more frames */
- if (av_compare_ts(ost->next_pts, ost->st->codec->time_base,
- STREAM_DURATION, (AVRational){ 1, 1 }) >= 0)
- return NULL;
-
- 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);
- if (!ost->sws_ctx) {
- fprintf(stderr,
- "Cannot initialize the conversion context\n");
- exit(1);
- }
- }
- 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);
- }
-
- 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;
- int got_packet = 0;
-
- c = ost->st->codec;
-
- frame = get_video_frame(ost);
-
- if (oc->oformat->flags & AVFMT_RAWPICTURE) {
- /* a hack to avoid data copy with some raw video muxers */
- AVPacket pkt;
- av_init_packet(&pkt);
-
- if (!frame)
- return 1;
-
- pkt.flags |= AV_PKT_FLAG_KEY;
- pkt.stream_index = ost->st->index;
- pkt.data = (uint8_t *)frame;
- pkt.size = sizeof(AVPicture);
-
- pkt.pts = pkt.dts = frame->pts;
- av_packet_rescale_ts(&pkt, c->time_base, ost->st->time_base);
-
- ret = av_interleaved_write_frame(oc, &pkt);
- } else {
- AVPacket pkt = { 0 };
- av_init_packet(&pkt);
-
- /* encode the image */
- ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
- if (ret < 0) {
- fprintf(stderr, "Error encoding a video frame\n");
- exit(1);
- }
-
- if (got_packet) {
- 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);
- }
-
- return (frame || got_packet) ? 0 : 1;
-}
-
-static void close_stream(AVFormatContext *oc, OutputStream *ost)
-{
- avcodec_close(ost->st->codec);
- av_frame_free(&ost->frame);
- av_frame_free(&ost->tmp_frame);
- sws_freeContext(ost->sws_ctx);
- avresample_free(&ost->avr);
-}
-
-/**************************************************************/
-/* media file output */
-
-int main(int argc, char **argv)
-{
- OutputStream video_st = { 0 }, audio_st = { 0 };
- const char *filename;
- AVOutputFormat *fmt;
- AVFormatContext *oc;
- int have_video = 0, have_audio = 0;
- int encode_video = 0, encode_audio = 0;
-
- /* 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. */
- if (fmt->video_codec != AV_CODEC_ID_NONE) {
- add_video_stream(&video_st, oc, fmt->video_codec);
- have_video = 1;
- encode_video = 1;
- }
- if (fmt->audio_codec != AV_CODEC_ID_NONE) {
- add_audio_stream(&audio_st, oc, fmt->audio_codec);
- have_audio = 1;
- encode_audio = 1;
- }
-
- /* Now that all the parameters are set, we can open the audio and
- * video codecs and allocate the necessary encode buffers. */
- if (have_video)
- open_video(oc, &video_st);
- if (have_audio)
- 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);
-
- while (encode_video || encode_audio) {
- /* select the stream to encode */
- if (encode_video &&
- (!encode_audio || av_compare_ts(video_st.next_pts, video_st.st->codec->time_base,
- audio_st.next_pts, audio_st.st->codec->time_base) <= 0)) {
- encode_video = !write_video_frame(oc, &video_st);
- } else {
- encode_audio = !process_audio_stream(oc, &audio_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 (have_video)
- close_stream(oc, &video_st);
- if (have_audio)
- close_stream(oc, &audio_st);
-
- if (!(fmt->flags & AVFMT_NOFILE))
- /* Close the output file. */
- avio_close(oc->pb);
-
- /* free the stream */
- avformat_free_context(oc);
-
- return 0;
-}
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