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