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
34static 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
46int 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 |= 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);
150end:
151
152    avformat_close_input(&ifmt_ctx);
153
154    /* close output */
155    if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
156        avio_close(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