/* * Copyright (c) 2013 Stefano Sabatini * * 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/libavcodec demuxing and muxing API usage example * @example remux.c * * Remux streams from one container format to another. Data is copied from the * input to the output without transcoding. */ #include <libavutil/mem.h> #include <libavutil/timestamp.h> #include <libavformat/avformat.h> static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt, const char *tag) { AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base; printf("%s: pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n", tag, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base), av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base), av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base), pkt->stream_index); } int main(int argc, char **argv) { const AVOutputFormat *ofmt = NULL; AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL; AVPacket *pkt = NULL; const char *in_filename, *out_filename; int ret, i; int stream_index = 0; int *stream_mapping = NULL; int stream_mapping_size = 0; if (argc < 3) { printf("usage: %s input output\n" "API example program to remux a media file with libavformat and libavcodec.\n" "The output format is guessed according to the file extension.\n" "\n", argv[0]); return 1; } in_filename = argv[1]; out_filename = argv[2]; pkt = av_packet_alloc(); if (!pkt) { fprintf(stderr, "Could not allocate AVPacket\n"); return 1; } if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) { fprintf(stderr, "Could not open input file '%s'", in_filename); goto end; } if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) { fprintf(stderr, "Failed to retrieve input stream information"); goto end; } av_dump_format(ifmt_ctx, 0, in_filename, 0); avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename); if (!ofmt_ctx) { fprintf(stderr, "Could not create output context\n"); ret = AVERROR_UNKNOWN; goto end; } stream_mapping_size = ifmt_ctx->nb_streams; stream_mapping = av_calloc(stream_mapping_size, sizeof(*stream_mapping)); if (!stream_mapping) { ret = AVERROR(ENOMEM); goto end; } ofmt = ofmt_ctx->oformat; for (i = 0; i < ifmt_ctx->nb_streams; i++) { AVStream *out_stream; AVStream *in_stream = ifmt_ctx->streams[i]; AVCodecParameters *in_codecpar = in_stream->codecpar; if (in_codecpar->codec_type != AVMEDIA_TYPE_AUDIO && in_codecpar->codec_type != AVMEDIA_TYPE_VIDEO && in_codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) { stream_mapping[i] = -1; continue; } stream_mapping[i] = stream_index++; out_stream = avformat_new_stream(ofmt_ctx, NULL); if (!out_stream) { fprintf(stderr, "Failed allocating output stream\n"); ret = AVERROR_UNKNOWN; goto end; } ret = avcodec_parameters_copy(out_stream->codecpar, in_codecpar); if (ret < 0) { fprintf(stderr, "Failed to copy codec parameters\n"); goto end; } out_stream->codecpar->codec_tag = 0; } av_dump_format(ofmt_ctx, 0, out_filename, 1); if (!(ofmt->flags & AVFMT_NOFILE)) { ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE); if (ret < 0) { fprintf(stderr, "Could not open output file '%s'", out_filename); goto end; } } ret = avformat_write_header(ofmt_ctx, NULL); if (ret < 0) { fprintf(stderr, "Error occurred when opening output file\n"); goto end; } while (1) { AVStream *in_stream, *out_stream; ret = av_read_frame(ifmt_ctx, pkt); if (ret < 0) break; in_stream = ifmt_ctx->streams[pkt->stream_index]; if (pkt->stream_index >= stream_mapping_size || stream_mapping[pkt->stream_index] < 0) { av_packet_unref(pkt); continue; } pkt->stream_index = stream_mapping[pkt->stream_index]; out_stream = ofmt_ctx->streams[pkt->stream_index]; log_packet(ifmt_ctx, pkt, "in"); /* copy packet */ av_packet_rescale_ts(pkt, in_stream->time_base, out_stream->time_base); pkt->pos = -1; log_packet(ofmt_ctx, pkt, "out"); ret = av_interleaved_write_frame(ofmt_ctx, pkt); /* pkt is now blank (av_interleaved_write_frame() takes ownership of * its contents and resets pkt), so that no unreferencing is necessary. * This would be different if one used av_write_frame(). */ if (ret < 0) { fprintf(stderr, "Error muxing packet\n"); break; } } av_write_trailer(ofmt_ctx); end: av_packet_free(&pkt); avformat_close_input(&ifmt_ctx); /* close output */ if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE)) avio_closep(&ofmt_ctx->pb); avformat_free_context(ofmt_ctx); av_freep(&stream_mapping); if (ret < 0 && ret != AVERROR_EOF) { fprintf(stderr, "Error occurred: %s\n", av_err2str(ret)); return 1; } return 0; }