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  1. /*
  2.  * Copyright (c) 2013 Stefano Sabatini
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a copy
  5.  * of this software and associated documentation files (the "Software"), to deal
  6.  * in the Software without restriction, including without limitation the rights
  7.  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  8.  * copies of the Software, and to permit persons to whom the Software is
  9.  * furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice shall be included in
  12.  * all copies or substantial portions of the Software.
  13.  *
  14.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  17.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  19.  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  20.  * THE SOFTWARE.
  21.  */
  22.  
  23. /**
  24.  * @file
  25.  * libavformat/libavcodec demuxing and muxing API example.
  26.  *
  27.  * Remux streams from one container format to another.
  28.  * @example remuxing.c
  29.  */
  30.  
  31. #include <libavutil/timestamp.h>
  32. #include <libavformat/avformat.h>
  33.  
  34. static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt, const char *tag)
  35. {
  36.     AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base;
  37.  
  38.     printf("%s: pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n",
  39.            tag,
  40.            av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base),
  41.            av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base),
  42.            av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base),
  43.            pkt->stream_index);
  44. }
  45.  
  46. int main(int argc, char **argv)
  47. {
  48.     AVOutputFormat *ofmt = NULL;
  49.     AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
  50.     AVPacket pkt;
  51.     const char *in_filename, *out_filename;
  52.     int ret, i;
  53.  
  54.     if (argc < 3) {
  55.         printf("usage: %s input output\n"
  56.                "API example program to remux a media file with libavformat and libavcodec.\n"
  57.                "The output format is guessed according to the file extension.\n"
  58.                "\n", argv[0]);
  59.         return 1;
  60.     }
  61.  
  62.     in_filename  = argv[1];
  63.     out_filename = argv[2];
  64.  
  65.     av_register_all();
  66.  
  67.     if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
  68.         fprintf(stderr, "Could not open input file '%s'", in_filename);
  69.         goto end;
  70.     }
  71.  
  72.     if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
  73.         fprintf(stderr, "Failed to retrieve input stream information");
  74.         goto end;
  75.     }
  76.  
  77.     av_dump_format(ifmt_ctx, 0, in_filename, 0);
  78.  
  79.     avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
  80.     if (!ofmt_ctx) {
  81.         fprintf(stderr, "Could not create output context\n");
  82.         ret = AVERROR_UNKNOWN;
  83.         goto end;
  84.     }
  85.  
  86.     ofmt = ofmt_ctx->oformat;
  87.  
  88.     for (i = 0; i < ifmt_ctx->nb_streams; i++) {
  89.         AVStream *in_stream = ifmt_ctx->streams[i];
  90.         AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
  91.         if (!out_stream) {
  92.             fprintf(stderr, "Failed allocating output stream\n");
  93.             ret = AVERROR_UNKNOWN;
  94.             goto end;
  95.         }
  96.  
  97.         ret = avcodec_copy_context(out_stream->codec, in_stream->codec);
  98.         if (ret < 0) {
  99.             fprintf(stderr, "Failed to copy context from input to output stream codec context\n");
  100.             goto end;
  101.         }
  102.         out_stream->codec->codec_tag = 0;
  103.         if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
  104.             out_stream->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
  105.     }
  106.     av_dump_format(ofmt_ctx, 0, out_filename, 1);
  107.  
  108.     if (!(ofmt->flags & AVFMT_NOFILE)) {
  109.         ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
  110.         if (ret < 0) {
  111.             fprintf(stderr, "Could not open output file '%s'", out_filename);
  112.             goto end;
  113.         }
  114.     }
  115.  
  116.     ret = avformat_write_header(ofmt_ctx, NULL);
  117.     if (ret < 0) {
  118.         fprintf(stderr, "Error occurred when opening output file\n");
  119.         goto end;
  120.     }
  121.  
  122.     while (1) {
  123.         AVStream *in_stream, *out_stream;
  124.  
  125.         ret = av_read_frame(ifmt_ctx, &pkt);
  126.         if (ret < 0)
  127.             break;
  128.  
  129.         in_stream  = ifmt_ctx->streams[pkt.stream_index];
  130.         out_stream = ofmt_ctx->streams[pkt.stream_index];
  131.  
  132.         log_packet(ifmt_ctx, &pkt, "in");
  133.  
  134.         /* copy packet */
  135.         pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
  136.         pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
  137.         pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
  138.         pkt.pos = -1;
  139.         log_packet(ofmt_ctx, &pkt, "out");
  140.  
  141.         ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
  142.         if (ret < 0) {
  143.             fprintf(stderr, "Error muxing packet\n");
  144.             break;
  145.         }
  146.         av_free_packet(&pkt);
  147.     }
  148.  
  149.     av_write_trailer(ofmt_ctx);
  150. end:
  151.  
  152.     avformat_close_input(&ifmt_ctx);
  153.  
  154.     /* close output */
  155.     if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
  156.         avio_closep(&ofmt_ctx->pb);
  157.     avformat_free_context(ofmt_ctx);
  158.  
  159.     if (ret < 0 && ret != AVERROR_EOF) {
  160.         fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));
  161.         return 1;
  162.     }
  163.  
  164.     return 0;
  165. }
  166.