New file |
| | |
| | | /* |
| | | * 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 example. |
| | | * |
| | | * Remux streams from one container format to another. |
| | | * @example remuxing.c |
| | | */ |
| | | |
| | | #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) |
| | | { |
| | | AVOutputFormat *ofmt = NULL; |
| | | AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL; |
| | | AVPacket pkt; |
| | | 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]; |
| | | |
| | | 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_mallocz_array(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 */ |
| | | pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX); |
| | | pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX); |
| | | pkt.duration = av_rescale_q(pkt.duration, 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); |
| | | if (ret < 0) { |
| | | fprintf(stderr, "Error muxing packet\n"); |
| | | break; |
| | | } |
| | | av_packet_unref(&pkt); |
| | | } |
| | | |
| | | av_write_trailer(ofmt_ctx); |
| | | end: |
| | | |
| | | 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; |
| | | } |