2 * Copyright (c) 2014 Martin Storsjo
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavformat/avformat.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/mathematics.h"
29 static int usage(const char *argv0
, int ret
)
31 fprintf(stderr
, "%s -out foo.mpd file1\n", argv0
);
40 int is_audio
, is_video
;
42 int sample_rate
, channels
;
45 int64_t sidx_start
, sidx_length
;
46 int64_t earliest_presentation
;
47 uint32_t earliest_presentation_timescale
;
53 struct Track
**tracks
;
54 int multiple_tracks_per_file
;
57 static void set_codec_str(AVCodecContext
*codec
, char *str
, int size
)
59 switch (codec
->codec_id
) {
60 case AV_CODEC_ID_H264
:
61 snprintf(str
, size
, "avc1");
62 if (codec
->extradata_size
>= 4 && codec
->extradata
[0] == 1) {
63 av_strlcatf(str
, size
, ".%02x%02x%02x",
64 codec
->extradata
[1], codec
->extradata
[2], codec
->extradata
[3]);
68 snprintf(str
, size
, "mp4a.40"); // 0x40 is the mp4 object type for AAC
69 if (codec
->extradata_size
>= 2) {
70 int aot
= codec
->extradata
[0] >> 3;
72 aot
= ((AV_RB16(codec
->extradata
) >> 5) & 0x3f) + 32;
73 av_strlcatf(str
, size
, ".%d", aot
);
79 static int find_sidx(struct Tracks
*tracks
, int start_index
,
83 AVIOContext
*f
= NULL
;
86 if ((err
= avio_open2(&f
, file
, AVIO_FLAG_READ
, NULL
, NULL
)) < 0)
89 while (!f
->eof_reached
) {
90 int64_t pos
= avio_tell(f
);
97 if (tag
== MKBETAG('s', 'i', 'd', 'x')) {
98 int version
, track_id
;
100 int64_t earliest_presentation
;
101 version
= avio_r8(f
);
102 avio_rb24(f
); /* flags */
103 track_id
= avio_rb32(f
);
104 timescale
= avio_rb32(f
);
105 earliest_presentation
= version
? avio_rb64(f
) : avio_rb32(f
);
106 for (i
= start_index
; i
< tracks
->nb_tracks
; i
++) {
107 struct Track
*track
= tracks
->tracks
[i
];
108 if (!track
->sidx_start
) {
109 track
->sidx_start
= pos
;
110 track
->sidx_length
= size
;
111 } else if (pos
== track
->sidx_start
+ track
->sidx_length
) {
112 track
->sidx_length
= pos
+ size
- track
->sidx_start
;
114 if (track
->track_id
== track_id
) {
115 track
->earliest_presentation
= earliest_presentation
;
116 track
->earliest_presentation_timescale
= timescale
;
120 if (avio_seek(f
, pos
+ size
, SEEK_SET
) != pos
+ size
)
130 static int handle_file(struct Tracks
*tracks
, const char *file
)
132 AVFormatContext
*ctx
= NULL
;
133 int err
= 0, i
, orig_tracks
= tracks
->nb_tracks
;
134 char errbuf
[50], *ptr
;
137 err
= avformat_open_input(&ctx
, file
, NULL
, NULL
);
139 av_strerror(err
, errbuf
, sizeof(errbuf
));
140 fprintf(stderr
, "Unable to open %s: %s\n", file
, errbuf
);
144 err
= avformat_find_stream_info(ctx
, NULL
);
146 av_strerror(err
, errbuf
, sizeof(errbuf
));
147 fprintf(stderr
, "Unable to identify %s: %s\n", file
, errbuf
);
151 if (ctx
->nb_streams
< 1) {
152 fprintf(stderr
, "No streams found in %s\n", file
);
155 if (ctx
->nb_streams
> 1)
156 tracks
->multiple_tracks_per_file
= 1;
158 for (i
= 0; i
< ctx
->nb_streams
; i
++) {
160 AVStream
*st
= ctx
->streams
[i
];
162 if (st
->codec
->bit_rate
== 0) {
163 fprintf(stderr
, "Skipping track %d in %s as it has zero bitrate\n",
168 track
= av_mallocz(sizeof(*track
));
170 err
= AVERROR(ENOMEM
);
173 temp
= av_realloc(tracks
->tracks
,
174 sizeof(*tracks
->tracks
) * (tracks
->nb_tracks
+ 1));
177 err
= AVERROR(ENOMEM
);
180 tracks
->tracks
= temp
;
181 tracks
->tracks
[tracks
->nb_tracks
] = track
;
184 if ((ptr
= strrchr(file
, '/')))
185 track
->name
= ptr
+ 1;
187 track
->bitrate
= st
->codec
->bit_rate
;
188 track
->track_id
= st
->id
;
189 track
->timescale
= st
->time_base
.den
;
190 track
->duration
= st
->duration
;
191 track
->is_audio
= st
->codec
->codec_type
== AVMEDIA_TYPE_AUDIO
;
192 track
->is_video
= st
->codec
->codec_type
== AVMEDIA_TYPE_VIDEO
;
194 if (!track
->is_audio
&& !track
->is_video
) {
196 "Track %d in %s is neither video nor audio, skipping\n",
197 track
->track_id
, file
);
198 av_freep(&tracks
->tracks
[tracks
->nb_tracks
]);
202 tracks
->duration
= FFMAX(tracks
->duration
,
203 av_rescale_rnd(track
->duration
, AV_TIME_BASE
,
204 track
->timescale
, AV_ROUND_UP
));
206 if (track
->is_audio
) {
207 track
->channels
= st
->codec
->channels
;
208 track
->sample_rate
= st
->codec
->sample_rate
;
210 if (track
->is_video
) {
211 track
->width
= st
->codec
->width
;
212 track
->height
= st
->codec
->height
;
214 set_codec_str(st
->codec
, track
->codec_str
, sizeof(track
->codec_str
));
219 avformat_close_input(&ctx
);
221 err
= find_sidx(tracks
, orig_tracks
, file
);
225 avformat_close_input(&ctx
);
229 static void write_time(FILE *out
, int64_t time
, int decimals
, enum AVRounding round
)
231 int seconds
= time
/ AV_TIME_BASE
;
232 int fractions
= time
% AV_TIME_BASE
;
233 int minutes
= seconds
/ 60;
234 int hours
= minutes
/ 60;
235 fractions
= av_rescale_rnd(fractions
, pow(10, decimals
), AV_TIME_BASE
, round
);
240 fprintf(out
, "%dH", hours
);
241 if (hours
|| minutes
)
242 fprintf(out
, "%dM", minutes
);
243 fprintf(out
, "%d.%0*dS", seconds
, decimals
, fractions
);
246 static int output_mpd(struct Tracks
*tracks
, const char *filename
)
250 struct Track
**adaptation_sets_buf
[2] = { NULL
};
251 struct Track
***adaptation_sets
;
252 int nb_tracks_buf
[2] = { 0 };
255 int64_t latest_start
= 0;
257 if (!tracks
->multiple_tracks_per_file
) {
258 adaptation_sets
= adaptation_sets_buf
;
259 nb_tracks
= nb_tracks_buf
;
261 for (i
= 0; i
< 2; i
++) {
262 adaptation_sets
[i
] = av_malloc(sizeof(*adaptation_sets
[i
]) * tracks
->nb_tracks
);
263 if (!adaptation_sets
[i
]) {
264 ret
= AVERROR(ENOMEM
);
268 for (i
= 0; i
< tracks
->nb_tracks
; i
++) {
270 if (tracks
->tracks
[i
]->is_video
)
272 else if (tracks
->tracks
[i
]->is_audio
)
276 adaptation_sets
[set_index
][nb_tracks
[set_index
]++] = tracks
->tracks
[i
];
279 adaptation_sets
= &tracks
->tracks
;
280 nb_tracks
= &tracks
->nb_tracks
;
284 out
= fopen(filename
, "w");
286 ret
= AVERROR(errno
);
290 fprintf(out
, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
291 fprintf(out
, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
292 "\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
293 "\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
294 "\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
295 "\tprofiles=\"urn:mpeg:dash:profile:isoff-on-demand:2011\"\n"
296 "\ttype=\"static\"\n");
297 fprintf(out
, "\tmediaPresentationDuration=\"");
298 write_time(out
, tracks
->duration
, 1, AV_ROUND_DOWN
);
299 fprintf(out
, "\"\n");
300 fprintf(out
, "\tminBufferTime=\"PT5S\">\n");
302 for (i
= 0; i
< tracks
->nb_tracks
; i
++) {
303 int64_t start
= av_rescale_rnd(tracks
->tracks
[i
]->earliest_presentation
,
305 tracks
->tracks
[i
]->earliest_presentation_timescale
,
307 latest_start
= FFMAX(start
, latest_start
);
309 fprintf(out
, "\t<Period start=\"");
310 write_time(out
, latest_start
, 3, AV_ROUND_UP
);
311 fprintf(out
, "\">\n");
314 for (set
= 0; set
< nb_sets
; set
++) {
315 if (nb_tracks
[set
] == 0)
317 fprintf(out
, "\t\t<AdaptationSet segmentAlignment=\"true\">\n");
319 for (i
= 0; i
< nb_tracks
[set
]; i
++) {
320 struct Track
*track
= adaptation_sets
[set
][i
];
321 if (strcmp(track
->name
, adaptation_sets
[set
][0]->name
))
323 fprintf(out
, "\t\t\t<ContentComponent id=\"%d\" contentType=\"%s\" />\n", track
->track_id
, track
->is_audio
? "audio" : "video");
327 for (i
= 0; i
< nb_tracks
[set
]; ) {
328 struct Track
*first_track
= adaptation_sets
[set
][i
];
329 int width
= 0, height
= 0, sample_rate
= 0, channels
= 0, bitrate
= 0;
330 fprintf(out
, "\t\t\t<Representation id=\"%d\" codecs=\"", i
);
331 for (j
= i
; j
< nb_tracks
[set
]; j
++) {
332 struct Track
*track
= adaptation_sets
[set
][j
];
333 if (strcmp(track
->name
, first_track
->name
))
335 if (track
->is_audio
) {
336 sample_rate
= track
->sample_rate
;
337 channels
= track
->channels
;
339 if (track
->is_video
) {
340 width
= track
->width
;
341 height
= track
->height
;
343 bitrate
+= track
->bitrate
;
346 fprintf(out
, "%s", track
->codec_str
);
348 fprintf(out
, "\" mimeType=\"%s/mp4\" bandwidth=\"%d\"",
349 width
? "video" : "audio", bitrate
);
350 if (width
> 0 && height
> 0)
351 fprintf(out
, " width=\"%d\" height=\"%d\"", width
, height
);
353 fprintf(out
, " audioSamplingRate=\"%d\"", sample_rate
);
356 fprintf(out
, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", channels
);
357 fprintf(out
, "\t\t\t\t<BaseURL>%s</BaseURL>\n", first_track
->name
);
358 fprintf(out
, "\t\t\t\t<SegmentBase indexRange=\"%"PRId64
"-%"PRId64
"\" />\n", first_track
->sidx_start
, first_track
->sidx_start
+ first_track
->sidx_length
- 1);
359 fprintf(out
, "\t\t\t</Representation>\n");
362 fprintf(out
, "\t\t</AdaptationSet>\n");
364 fprintf(out
, "\t</Period>\n");
365 fprintf(out
, "</MPD>\n");
369 for (i
= 0; i
< 2; i
++)
370 av_free(adaptation_sets_buf
[i
]);
374 static void clean_tracks(struct Tracks
*tracks
)
377 for (i
= 0; i
< tracks
->nb_tracks
; i
++) {
378 av_freep(&tracks
->tracks
[i
]);
380 av_freep(&tracks
->tracks
);
381 tracks
->nb_tracks
= 0;
384 int main(int argc
, char **argv
)
386 const char *out
= NULL
;
387 struct Tracks tracks
= { 0 };
392 for (i
= 1; i
< argc
; i
++) {
393 if (!strcmp(argv
[i
], "-out")) {
396 } else if (argv
[i
][0] == '-') {
397 return usage(argv
[0], 1);
399 if (handle_file(&tracks
, argv
[i
]))
403 if (!tracks
.nb_tracks
|| !out
)
404 return usage(argv
[0], 1);
406 output_mpd(&tracks
, out
);
408 clean_tracks(&tracks
);