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
log_packet(const AVFormatContext * fmt_ctx,const AVPacket * pkt,const char * tag)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
main(int argc,char ** argv)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 int stream_index = 0;
54 int *stream_mapping = NULL;
55 int stream_mapping_size = 0;
56
57 if (argc < 3) {
58 printf("usage: %s input output\n"
59 "API example program to remux a media file with libavformat and libavcodec.\n"
60 "The output format is guessed according to the file extension.\n"
61 "\n", argv[0]);
62 return 1;
63 }
64
65 in_filename = argv[1];
66 out_filename = argv[2];
67
68 if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
69 fprintf(stderr, "Could not open input file '%s'", in_filename);
70 goto end;
71 }
72
73 if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
74 fprintf(stderr, "Failed to retrieve input stream information");
75 goto end;
76 }
77
78 av_dump_format(ifmt_ctx, 0, in_filename, 0);
79
80 avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, out_filename);
81 if (!ofmt_ctx) {
82 fprintf(stderr, "Could not create output context\n");
83 ret = AVERROR_UNKNOWN;
84 goto end;
85 }
86
87 stream_mapping_size = ifmt_ctx->nb_streams;
88 stream_mapping = av_mallocz_array(stream_mapping_size, sizeof(*stream_mapping));
89 if (!stream_mapping) {
90 ret = AVERROR(ENOMEM);
91 goto end;
92 }
93
94 ofmt = ofmt_ctx->oformat;
95
96 for (i = 0; i < ifmt_ctx->nb_streams; i++) {
97 AVStream *out_stream;
98 AVStream *in_stream = ifmt_ctx->streams[i];
99 AVCodecParameters *in_codecpar = in_stream->codecpar;
100
101 if (in_codecpar->codec_type != AVMEDIA_TYPE_AUDIO &&
102 in_codecpar->codec_type != AVMEDIA_TYPE_VIDEO &&
103 in_codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) {
104 stream_mapping[i] = -1;
105 continue;
106 }
107
108 stream_mapping[i] = stream_index++;
109
110 out_stream = avformat_new_stream(ofmt_ctx, NULL);
111 if (!out_stream) {
112 fprintf(stderr, "Failed allocating output stream\n");
113 ret = AVERROR_UNKNOWN;
114 goto end;
115 }
116
117 ret = avcodec_parameters_copy(out_stream->codecpar, in_codecpar);
118 if (ret < 0) {
119 fprintf(stderr, "Failed to copy codec parameters\n");
120 goto end;
121 }
122 out_stream->codecpar->codec_tag = 0;
123 }
124 av_dump_format(ofmt_ctx, 0, out_filename, 1);
125
126 if (!(ofmt->flags & AVFMT_NOFILE)) {
127 ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
128 if (ret < 0) {
129 fprintf(stderr, "Could not open output file '%s'", out_filename);
130 goto end;
131 }
132 }
133
134 ret = avformat_write_header(ofmt_ctx, NULL);
135 if (ret < 0) {
136 fprintf(stderr, "Error occurred when opening output file\n");
137 goto end;
138 }
139
140 while (1) {
141 AVStream *in_stream, *out_stream;
142
143 ret = av_read_frame(ifmt_ctx, &pkt);
144 if (ret < 0)
145 break;
146
147 in_stream = ifmt_ctx->streams[pkt.stream_index];
148 if (pkt.stream_index >= stream_mapping_size ||
149 stream_mapping[pkt.stream_index] < 0) {
150 av_packet_unref(&pkt);
151 continue;
152 }
153
154 pkt.stream_index = stream_mapping[pkt.stream_index];
155 out_stream = ofmt_ctx->streams[pkt.stream_index];
156 log_packet(ifmt_ctx, &pkt, "in");
157
158 /* copy packet */
159 pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
160 pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
161 pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
162 pkt.pos = -1;
163 log_packet(ofmt_ctx, &pkt, "out");
164
165 ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
166 if (ret < 0) {
167 fprintf(stderr, "Error muxing packet\n");
168 break;
169 }
170 av_packet_unref(&pkt);
171 }
172
173 av_write_trailer(ofmt_ctx);
174 end:
175
176 avformat_close_input(&ifmt_ctx);
177
178 /* close output */
179 if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
180 avio_closep(&ofmt_ctx->pb);
181 avformat_free_context(ofmt_ctx);
182
183 av_freep(&stream_mapping);
184
185 if (ret < 0 && ret != AVERROR_EOF) {
186 fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));
187 return 1;
188 }
189
190 return 0;
191 }
192