584 lines
20 KiB
C
584 lines
20 KiB
C
/*
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* Copyright (c) 2010 Nicolas George
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* Copyright (c) 2011 Stefano Sabatini
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* Copyright (c) 2014 Andrey Utkin
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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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* API example for demuxing, decoding, filtering, encoding and muxing
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* @example transcoding.c
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*/
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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#include <libavfilter/avfiltergraph.h>
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#include <libavfilter/avcodec.h>
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#include <libavfilter/buffersink.h>
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#include <libavfilter/buffersrc.h>
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#include <libavutil/opt.h>
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#include <libavutil/pixdesc.h>
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static AVFormatContext *ifmt_ctx;
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static AVFormatContext *ofmt_ctx;
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typedef struct FilteringContext {
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AVFilterContext *buffersink_ctx;
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AVFilterContext *buffersrc_ctx;
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AVFilterGraph *filter_graph;
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} FilteringContext;
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static FilteringContext *filter_ctx;
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static int open_input_file(const char *filename)
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{
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int ret;
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unsigned int i;
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ifmt_ctx = NULL;
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if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n");
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return ret;
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}
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if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
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return ret;
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}
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for (i = 0; i < ifmt_ctx->nb_streams; i++) {
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AVStream *stream;
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AVCodecContext *codec_ctx;
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stream = ifmt_ctx->streams[i];
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codec_ctx = stream->codec;
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/* Reencode video & audio and remux subtitles etc. */
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if (codec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
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|| codec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
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/* Open decoder */
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ret = avcodec_open2(codec_ctx,
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avcodec_find_decoder(codec_ctx->codec_id), NULL);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Failed to open decoder for stream #%u\n", i);
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return ret;
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}
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}
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}
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av_dump_format(ifmt_ctx, 0, filename, 0);
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return 0;
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}
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static int open_output_file(const char *filename)
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{
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AVStream *out_stream;
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AVStream *in_stream;
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AVCodecContext *dec_ctx, *enc_ctx;
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AVCodec *encoder;
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int ret;
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unsigned int i;
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ofmt_ctx = NULL;
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avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, filename);
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if (!ofmt_ctx) {
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av_log(NULL, AV_LOG_ERROR, "Could not create output context\n");
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return AVERROR_UNKNOWN;
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}
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for (i = 0; i < ifmt_ctx->nb_streams; i++) {
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out_stream = avformat_new_stream(ofmt_ctx, NULL);
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if (!out_stream) {
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av_log(NULL, AV_LOG_ERROR, "Failed allocating output stream\n");
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return AVERROR_UNKNOWN;
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}
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in_stream = ifmt_ctx->streams[i];
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dec_ctx = in_stream->codec;
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enc_ctx = out_stream->codec;
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if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO
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|| dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
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/* in this example, we choose transcoding to same codec */
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encoder = avcodec_find_encoder(dec_ctx->codec_id);
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if (!encoder) {
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av_log(NULL, AV_LOG_FATAL, "Neccessary encoder not found\n");
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return AVERROR_INVALIDDATA;
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}
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/* In this example, we transcode to same properties (picture size,
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* sample rate etc.). These properties can be changed for output
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* streams easily using filters */
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if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
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enc_ctx->height = dec_ctx->height;
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enc_ctx->width = dec_ctx->width;
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enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
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/* take first format from list of supported formats */
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enc_ctx->pix_fmt = encoder->pix_fmts[0];
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/* video time_base can be set to whatever is handy and supported by encoder */
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enc_ctx->time_base = dec_ctx->time_base;
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} else {
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enc_ctx->sample_rate = dec_ctx->sample_rate;
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enc_ctx->channel_layout = dec_ctx->channel_layout;
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enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
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/* take first format from list of supported formats */
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enc_ctx->sample_fmt = encoder->sample_fmts[0];
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enc_ctx->time_base = (AVRational){1, enc_ctx->sample_rate};
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}
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/* Third parameter can be used to pass settings to encoder */
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ret = avcodec_open2(enc_ctx, encoder, NULL);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot open video encoder for stream #%u\n", i);
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return ret;
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}
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} else if (dec_ctx->codec_type == AVMEDIA_TYPE_UNKNOWN) {
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av_log(NULL, AV_LOG_FATAL, "Elementary stream #%d is of unknown type, cannot proceed\n", i);
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return AVERROR_INVALIDDATA;
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} else {
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/* if this stream must be remuxed */
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ret = avcodec_copy_context(ofmt_ctx->streams[i]->codec,
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ifmt_ctx->streams[i]->codec);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Copying stream context failed\n");
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return ret;
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}
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}
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if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
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enc_ctx->flags |= CODEC_FLAG_GLOBAL_HEADER;
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}
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av_dump_format(ofmt_ctx, 0, filename, 1);
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if (!(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) {
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ret = avio_open(&ofmt_ctx->pb, filename, AVIO_FLAG_WRITE);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Could not open output file '%s'", filename);
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return ret;
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}
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}
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/* init muxer, write output file header */
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ret = avformat_write_header(ofmt_ctx, NULL);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Error occurred when opening output file\n");
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return ret;
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}
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return 0;
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}
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static int init_filter(FilteringContext* fctx, AVCodecContext *dec_ctx,
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AVCodecContext *enc_ctx, const char *filter_spec)
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{
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char args[512];
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int ret = 0;
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AVFilter *buffersrc = NULL;
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AVFilter *buffersink = NULL;
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AVFilterContext *buffersrc_ctx = NULL;
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AVFilterContext *buffersink_ctx = NULL;
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AVFilterInOut *outputs = avfilter_inout_alloc();
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AVFilterInOut *inputs = avfilter_inout_alloc();
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AVFilterGraph *filter_graph = avfilter_graph_alloc();
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if (!outputs || !inputs || !filter_graph) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO) {
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buffersrc = avfilter_get_by_name("buffer");
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buffersink = avfilter_get_by_name("buffersink");
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if (!buffersrc || !buffersink) {
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av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
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ret = AVERROR_UNKNOWN;
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goto end;
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}
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snprintf(args, sizeof(args),
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"video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
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dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt,
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dec_ctx->time_base.num, dec_ctx->time_base.den,
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dec_ctx->sample_aspect_ratio.num,
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dec_ctx->sample_aspect_ratio.den);
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ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
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args, NULL, filter_graph);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n");
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goto end;
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}
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ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
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NULL, NULL, filter_graph);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n");
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goto end;
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}
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ret = av_opt_set_bin(buffersink_ctx, "pix_fmts",
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(uint8_t*)&enc_ctx->pix_fmt, sizeof(enc_ctx->pix_fmt),
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AV_OPT_SEARCH_CHILDREN);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n");
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goto end;
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}
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} else if (dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
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buffersrc = avfilter_get_by_name("abuffer");
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buffersink = avfilter_get_by_name("abuffersink");
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if (!buffersrc || !buffersink) {
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av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not found\n");
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ret = AVERROR_UNKNOWN;
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goto end;
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}
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if (!dec_ctx->channel_layout)
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dec_ctx->channel_layout =
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av_get_default_channel_layout(dec_ctx->channels);
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snprintf(args, sizeof(args),
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"time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"PRIx64,
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dec_ctx->time_base.num, dec_ctx->time_base.den, dec_ctx->sample_rate,
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av_get_sample_fmt_name(dec_ctx->sample_fmt),
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dec_ctx->channel_layout);
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ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
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args, NULL, filter_graph);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer source\n");
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goto end;
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}
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ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
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NULL, NULL, filter_graph);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot create audio buffer sink\n");
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goto end;
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}
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ret = av_opt_set_bin(buffersink_ctx, "sample_fmts",
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(uint8_t*)&enc_ctx->sample_fmt, sizeof(enc_ctx->sample_fmt),
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AV_OPT_SEARCH_CHILDREN);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot set output sample format\n");
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goto end;
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}
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ret = av_opt_set_bin(buffersink_ctx, "channel_layouts",
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(uint8_t*)&enc_ctx->channel_layout,
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sizeof(enc_ctx->channel_layout), AV_OPT_SEARCH_CHILDREN);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot set output channel layout\n");
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goto end;
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}
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ret = av_opt_set_bin(buffersink_ctx, "sample_rates",
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(uint8_t*)&enc_ctx->sample_rate, sizeof(enc_ctx->sample_rate),
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AV_OPT_SEARCH_CHILDREN);
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if (ret < 0) {
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av_log(NULL, AV_LOG_ERROR, "Cannot set output sample rate\n");
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goto end;
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}
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} else {
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ret = AVERROR_UNKNOWN;
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goto end;
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}
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/* Endpoints for the filter graph. */
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outputs->name = av_strdup("in");
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outputs->filter_ctx = buffersrc_ctx;
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outputs->pad_idx = 0;
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outputs->next = NULL;
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inputs->name = av_strdup("out");
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inputs->filter_ctx = buffersink_ctx;
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inputs->pad_idx = 0;
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inputs->next = NULL;
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if (!outputs->name || !inputs->name) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec,
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&inputs, &outputs, NULL)) < 0)
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goto end;
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if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
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goto end;
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/* Fill FilteringContext */
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fctx->buffersrc_ctx = buffersrc_ctx;
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fctx->buffersink_ctx = buffersink_ctx;
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fctx->filter_graph = filter_graph;
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end:
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avfilter_inout_free(&inputs);
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avfilter_inout_free(&outputs);
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return ret;
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}
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static int init_filters(void)
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{
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const char *filter_spec;
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unsigned int i;
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int ret;
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filter_ctx = av_malloc_array(ifmt_ctx->nb_streams, sizeof(*filter_ctx));
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if (!filter_ctx)
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return AVERROR(ENOMEM);
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for (i = 0; i < ifmt_ctx->nb_streams; i++) {
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filter_ctx[i].buffersrc_ctx = NULL;
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filter_ctx[i].buffersink_ctx = NULL;
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filter_ctx[i].filter_graph = NULL;
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if (!(ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO
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|| ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO))
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continue;
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if (ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
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filter_spec = "null"; /* passthrough (dummy) filter for video */
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else
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filter_spec = "anull"; /* passthrough (dummy) filter for audio */
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ret = init_filter(&filter_ctx[i], ifmt_ctx->streams[i]->codec,
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ofmt_ctx->streams[i]->codec, filter_spec);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int encode_write_frame(AVFrame *filt_frame, unsigned int stream_index, int *got_frame) {
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int ret;
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int got_frame_local;
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AVPacket enc_pkt;
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int (*enc_func)(AVCodecContext *, AVPacket *, const AVFrame *, int *) =
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(ifmt_ctx->streams[stream_index]->codec->codec_type ==
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AVMEDIA_TYPE_VIDEO) ? avcodec_encode_video2 : avcodec_encode_audio2;
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if (!got_frame)
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got_frame = &got_frame_local;
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av_log(NULL, AV_LOG_INFO, "Encoding frame\n");
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/* encode filtered frame */
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enc_pkt.data = NULL;
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enc_pkt.size = 0;
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av_init_packet(&enc_pkt);
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ret = enc_func(ofmt_ctx->streams[stream_index]->codec, &enc_pkt,
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filt_frame, got_frame);
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av_frame_free(&filt_frame);
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if (ret < 0)
|
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return ret;
|
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if (!(*got_frame))
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return 0;
|
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|
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/* prepare packet for muxing */
|
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enc_pkt.stream_index = stream_index;
|
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av_packet_rescale_ts(&enc_pkt,
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ofmt_ctx->streams[stream_index]->codec->time_base,
|
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ofmt_ctx->streams[stream_index]->time_base);
|
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|
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av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n");
|
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/* mux encoded frame */
|
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ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt);
|
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return ret;
|
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}
|
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|
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static int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index)
|
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{
|
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int ret;
|
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AVFrame *filt_frame;
|
|
|
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av_log(NULL, AV_LOG_INFO, "Pushing decoded frame to filters\n");
|
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/* push the decoded frame into the filtergraph */
|
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ret = av_buffersrc_add_frame_flags(filter_ctx[stream_index].buffersrc_ctx,
|
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frame, 0);
|
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if (ret < 0) {
|
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av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n");
|
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return ret;
|
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}
|
|
|
|
/* pull filtered frames from the filtergraph */
|
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while (1) {
|
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filt_frame = av_frame_alloc();
|
|
if (!filt_frame) {
|
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ret = AVERROR(ENOMEM);
|
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break;
|
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}
|
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av_log(NULL, AV_LOG_INFO, "Pulling filtered frame from filters\n");
|
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ret = av_buffersink_get_frame(filter_ctx[stream_index].buffersink_ctx,
|
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filt_frame);
|
|
if (ret < 0) {
|
|
/* if no more frames for output - returns AVERROR(EAGAIN)
|
|
* if flushed and no more frames for output - returns AVERROR_EOF
|
|
* rewrite retcode to 0 to show it as normal procedure completion
|
|
*/
|
|
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
|
|
ret = 0;
|
|
av_frame_free(&filt_frame);
|
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break;
|
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}
|
|
|
|
filt_frame->pict_type = AV_PICTURE_TYPE_NONE;
|
|
ret = encode_write_frame(filt_frame, stream_index, NULL);
|
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if (ret < 0)
|
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break;
|
|
}
|
|
|
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return ret;
|
|
}
|
|
|
|
static int flush_encoder(unsigned int stream_index)
|
|
{
|
|
int ret;
|
|
int got_frame;
|
|
|
|
if (!(ofmt_ctx->streams[stream_index]->codec->codec->capabilities &
|
|
CODEC_CAP_DELAY))
|
|
return 0;
|
|
|
|
while (1) {
|
|
av_log(NULL, AV_LOG_INFO, "Flushing stream #%u encoder\n", stream_index);
|
|
ret = encode_write_frame(NULL, stream_index, &got_frame);
|
|
if (ret < 0)
|
|
break;
|
|
if (!got_frame)
|
|
return 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int ret;
|
|
AVPacket packet = { .data = NULL, .size = 0 };
|
|
AVFrame *frame = NULL;
|
|
enum AVMediaType type;
|
|
unsigned int stream_index;
|
|
unsigned int i;
|
|
int got_frame;
|
|
int (*dec_func)(AVCodecContext *, AVFrame *, int *, const AVPacket *);
|
|
|
|
if (argc != 3) {
|
|
av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <output file>\n", argv[0]);
|
|
return 1;
|
|
}
|
|
|
|
av_register_all();
|
|
avfilter_register_all();
|
|
|
|
if ((ret = open_input_file(argv[1])) < 0)
|
|
goto end;
|
|
if ((ret = open_output_file(argv[2])) < 0)
|
|
goto end;
|
|
if ((ret = init_filters()) < 0)
|
|
goto end;
|
|
|
|
/* read all packets */
|
|
while (1) {
|
|
if ((ret = av_read_frame(ifmt_ctx, &packet)) < 0)
|
|
break;
|
|
stream_index = packet.stream_index;
|
|
type = ifmt_ctx->streams[packet.stream_index]->codec->codec_type;
|
|
av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n",
|
|
stream_index);
|
|
|
|
if (filter_ctx[stream_index].filter_graph) {
|
|
av_log(NULL, AV_LOG_DEBUG, "Going to reencode&filter the frame\n");
|
|
frame = av_frame_alloc();
|
|
if (!frame) {
|
|
ret = AVERROR(ENOMEM);
|
|
break;
|
|
}
|
|
av_packet_rescale_ts(&packet,
|
|
ifmt_ctx->streams[stream_index]->time_base,
|
|
ifmt_ctx->streams[stream_index]->codec->time_base);
|
|
dec_func = (type == AVMEDIA_TYPE_VIDEO) ? avcodec_decode_video2 :
|
|
avcodec_decode_audio4;
|
|
ret = dec_func(ifmt_ctx->streams[stream_index]->codec, frame,
|
|
&got_frame, &packet);
|
|
if (ret < 0) {
|
|
av_frame_free(&frame);
|
|
av_log(NULL, AV_LOG_ERROR, "Decoding failed\n");
|
|
break;
|
|
}
|
|
|
|
if (got_frame) {
|
|
frame->pts = av_frame_get_best_effort_timestamp(frame);
|
|
ret = filter_encode_write_frame(frame, stream_index);
|
|
av_frame_free(&frame);
|
|
if (ret < 0)
|
|
goto end;
|
|
} else {
|
|
av_frame_free(&frame);
|
|
}
|
|
} else {
|
|
/* remux this frame without reencoding */
|
|
av_packet_rescale_ts(&packet,
|
|
ifmt_ctx->streams[stream_index]->time_base,
|
|
ofmt_ctx->streams[stream_index]->time_base);
|
|
|
|
ret = av_interleaved_write_frame(ofmt_ctx, &packet);
|
|
if (ret < 0)
|
|
goto end;
|
|
}
|
|
av_free_packet(&packet);
|
|
}
|
|
|
|
/* flush filters and encoders */
|
|
for (i = 0; i < ifmt_ctx->nb_streams; i++) {
|
|
/* flush filter */
|
|
if (!filter_ctx[i].filter_graph)
|
|
continue;
|
|
ret = filter_encode_write_frame(NULL, i);
|
|
if (ret < 0) {
|
|
av_log(NULL, AV_LOG_ERROR, "Flushing filter failed\n");
|
|
goto end;
|
|
}
|
|
|
|
/* flush encoder */
|
|
ret = flush_encoder(i);
|
|
if (ret < 0) {
|
|
av_log(NULL, AV_LOG_ERROR, "Flushing encoder failed\n");
|
|
goto end;
|
|
}
|
|
}
|
|
|
|
av_write_trailer(ofmt_ctx);
|
|
end:
|
|
av_free_packet(&packet);
|
|
av_frame_free(&frame);
|
|
for (i = 0; i < ifmt_ctx->nb_streams; i++) {
|
|
avcodec_close(ifmt_ctx->streams[i]->codec);
|
|
if (ofmt_ctx && ofmt_ctx->nb_streams > i && ofmt_ctx->streams[i] && ofmt_ctx->streams[i]->codec)
|
|
avcodec_close(ofmt_ctx->streams[i]->codec);
|
|
if (filter_ctx && filter_ctx[i].filter_graph)
|
|
avfilter_graph_free(&filter_ctx[i].filter_graph);
|
|
}
|
|
av_free(filter_ctx);
|
|
avformat_close_input(&ifmt_ctx);
|
|
if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE))
|
|
avio_closep(&ofmt_ctx->pb);
|
|
avformat_free_context(ofmt_ctx);
|
|
|
|
if (ret < 0)
|
|
av_log(NULL, AV_LOG_ERROR, "Error occurred: %s\n", av_err2str(ret));
|
|
|
|
return ret ? 1 : 0;
|
|
}
|