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sidxindex.c
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1 /*
2  * Copyright (c) 2014 Martin Storsjo
3  *
4  * This file is part of FFmpeg.
5  *
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.
10  *
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.
15  *
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
19  */
20 
21 #include <stdio.h>
22 #include <string.h>
23 
24 #include "libavformat/avformat.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/mathematics.h"
28 
29 static int usage(const char *argv0, int ret)
30 {
31  fprintf(stderr, "%s -out foo.mpd file1\n", argv0);
32  return ret;
33 }
34 
35 struct Track {
36  const char *name;
37  int64_t duration;
38  int bitrate;
39  int track_id;
40  int is_audio, is_video;
41  int width, height;
42  int sample_rate, channels;
43  int timescale;
44  char codec_str[30];
46 };
47 
48 struct Tracks {
49  int nb_tracks;
50  int64_t duration;
51  struct Track **tracks;
53 };
54 
55 static void set_codec_str(AVCodecParameters *codecpar, char *str, int size)
56 {
57  switch (codecpar->codec_id) {
58  case AV_CODEC_ID_H264:
59  snprintf(str, size, "avc1");
60  if (codecpar->extradata_size >= 4 && codecpar->extradata[0] == 1) {
61  av_strlcatf(str, size, ".%02x%02x%02x",
62  codecpar->extradata[1], codecpar->extradata[2],
63  codecpar->extradata[3]);
64  }
65  break;
66  case AV_CODEC_ID_AAC:
67  snprintf(str, size, "mp4a.40"); // 0x40 is the mp4 object type for AAC
68  if (codecpar->extradata_size >= 2) {
69  int aot = codecpar->extradata[0] >> 3;
70  if (aot == 31)
71  aot = ((AV_RB16(codecpar->extradata) >> 5) & 0x3f) + 32;
72  av_strlcatf(str, size, ".%d", aot);
73  }
74  break;
75  }
76 }
77 
78 static int find_sidx(struct Tracks *tracks, int start_index,
79  const char *file)
80 {
81  int err = 0;
82  AVIOContext *f = NULL;
83  int i;
84 
85  if ((err = avio_open2(&f, file, AVIO_FLAG_READ, NULL, NULL)) < 0)
86  goto fail;
87 
88  while (!f->eof_reached) {
89  int64_t pos = avio_tell(f);
90  int32_t size, tag;
91 
92  size = avio_rb32(f);
93  tag = avio_rb32(f);
94  if (size < 8)
95  break;
96  if (tag == MKBETAG('s', 'i', 'd', 'x')) {
97  for (i = start_index; i < tracks->nb_tracks; i++) {
98  struct Track *track = tracks->tracks[i];
99  if (!track->sidx_start) {
100  track->sidx_start = pos;
101  track->sidx_length = size;
102  } else if (pos == track->sidx_start + track->sidx_length) {
103  track->sidx_length = pos + size - track->sidx_start;
104  }
105  }
106  }
107  if (avio_seek(f, pos + size, SEEK_SET) != pos + size)
108  break;
109  }
110 
111 fail:
112  if (f)
113  avio_close(f);
114  return err;
115 }
116 
117 static int handle_file(struct Tracks *tracks, const char *file)
118 {
120  int err = 0, i, orig_tracks = tracks->nb_tracks;
121  char errbuf[50], *ptr;
122  struct Track *track;
123 
124  err = avformat_open_input(&ctx, file, NULL, NULL);
125  if (err < 0) {
126  av_strerror(err, errbuf, sizeof(errbuf));
127  fprintf(stderr, "Unable to open %s: %s\n", file, errbuf);
128  return 1;
129  }
130 
131  err = avformat_find_stream_info(ctx, NULL);
132  if (err < 0) {
133  av_strerror(err, errbuf, sizeof(errbuf));
134  fprintf(stderr, "Unable to identify %s: %s\n", file, errbuf);
135  goto fail;
136  }
137 
138  if (ctx->nb_streams < 1) {
139  fprintf(stderr, "No streams found in %s\n", file);
140  goto fail;
141  }
142  if (ctx->nb_streams > 1)
143  tracks->multiple_tracks_per_file = 1;
144 
145  for (i = 0; i < ctx->nb_streams; i++) {
146  struct Track **temp;
147  AVStream *st = ctx->streams[i];
148 
149  if (st->codecpar->bit_rate == 0) {
150  fprintf(stderr, "Skipping track %d in %s as it has zero bitrate\n",
151  st->id, file);
152  continue;
153  }
154 
155  track = av_mallocz(sizeof(*track));
156  if (!track) {
157  err = AVERROR(ENOMEM);
158  goto fail;
159  }
160  temp = av_realloc_array(tracks->tracks, tracks->nb_tracks + 1,
161  sizeof(*tracks->tracks));
162  if (!temp) {
163  av_free(track);
164  err = AVERROR(ENOMEM);
165  goto fail;
166  }
167  tracks->tracks = temp;
168  tracks->tracks[tracks->nb_tracks] = track;
169 
170  track->name = file;
171  if ((ptr = strrchr(file, '/')))
172  track->name = ptr + 1;
173 
174  track->bitrate = st->codecpar->bit_rate;
175  track->track_id = st->id;
176  track->timescale = st->time_base.den;
177  track->duration = st->duration;
180 
181  if (!track->is_audio && !track->is_video) {
182  fprintf(stderr,
183  "Track %d in %s is neither video nor audio, skipping\n",
184  track->track_id, file);
185  av_freep(&tracks->tracks[tracks->nb_tracks]);
186  continue;
187  }
188 
189  tracks->duration = FFMAX(tracks->duration,
191  track->timescale, AV_ROUND_UP));
192 
193  if (track->is_audio) {
194  track->channels = st->codecpar->channels;
195  track->sample_rate = st->codecpar->sample_rate;
196  }
197  if (track->is_video) {
198  track->width = st->codecpar->width;
199  track->height = st->codecpar->height;
200  }
201  set_codec_str(st->codecpar, track->codec_str, sizeof(track->codec_str));
202 
203  tracks->nb_tracks++;
204  }
205 
206  avformat_close_input(&ctx);
207 
208  err = find_sidx(tracks, orig_tracks, file);
209 
210 fail:
211  if (ctx)
212  avformat_close_input(&ctx);
213  return err;
214 }
215 
216 static void write_time(FILE *out, int64_t time, int decimals, enum AVRounding round)
217 {
218  int seconds = time / AV_TIME_BASE;
219  int fractions = time % AV_TIME_BASE;
220  int minutes = seconds / 60;
221  int hours = minutes / 60;
222  fractions = av_rescale_rnd(fractions, pow(10, decimals), AV_TIME_BASE, round);
223  seconds %= 60;
224  minutes %= 60;
225  fprintf(out, "PT");
226  if (hours)
227  fprintf(out, "%dH", hours);
228  if (hours || minutes)
229  fprintf(out, "%dM", minutes);
230  fprintf(out, "%d.%0*dS", seconds, decimals, fractions);
231 }
232 
233 static int output_mpd(struct Tracks *tracks, const char *filename)
234 {
235  FILE *out;
236  int i, j, ret = 0;
237  struct Track **adaptation_sets_buf[2] = { NULL };
238  struct Track ***adaptation_sets;
239  int nb_tracks_buf[2] = { 0 };
240  int *nb_tracks;
241  int set, nb_sets;
242 
243  if (!tracks->multiple_tracks_per_file) {
244  adaptation_sets = adaptation_sets_buf;
245  nb_tracks = nb_tracks_buf;
246  nb_sets = 2;
247  for (i = 0; i < 2; i++) {
248  adaptation_sets[i] = av_malloc_array(tracks->nb_tracks, sizeof(*adaptation_sets[i]));
249  if (!adaptation_sets[i]) {
250  ret = AVERROR(ENOMEM);
251  goto err;
252  }
253  }
254  for (i = 0; i < tracks->nb_tracks; i++) {
255  int set_index = -1;
256  if (tracks->tracks[i]->is_video)
257  set_index = 0;
258  else if (tracks->tracks[i]->is_audio)
259  set_index = 1;
260  else
261  continue;
262  adaptation_sets[set_index][nb_tracks[set_index]++] = tracks->tracks[i];
263  }
264  } else {
265  adaptation_sets = &tracks->tracks;
266  nb_tracks = &tracks->nb_tracks;
267  nb_sets = 1;
268  }
269 
270  out = fopen(filename, "w");
271  if (!out) {
272  ret = AVERROR(errno);
273  perror(filename);
274  return ret;
275  }
276  fprintf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
277  fprintf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
278  "\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
279  "\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
280  "\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
281  "\tprofiles=\"urn:mpeg:dash:profile:isoff-on-demand:2011\"\n"
282  "\ttype=\"static\"\n");
283  fprintf(out, "\tmediaPresentationDuration=\"");
284  write_time(out, tracks->duration, 1, AV_ROUND_DOWN);
285  fprintf(out, "\"\n");
286  fprintf(out, "\tminBufferTime=\"PT5S\">\n");
287 
288  fprintf(out, "\t<Period start=\"PT0.0S\">\n");
289 
290  for (set = 0; set < nb_sets; set++) {
291  if (nb_tracks[set] == 0)
292  continue;
293  fprintf(out, "\t\t<AdaptationSet segmentAlignment=\"true\">\n");
294  if (nb_sets == 1) {
295  for (i = 0; i < nb_tracks[set]; i++) {
296  struct Track *track = adaptation_sets[set][i];
297  if (strcmp(track->name, adaptation_sets[set][0]->name))
298  break;
299  fprintf(out, "\t\t\t<ContentComponent id=\"%d\" contentType=\"%s\" />\n", track->track_id, track->is_audio ? "audio" : "video");
300  }
301  }
302 
303  for (i = 0; i < nb_tracks[set]; ) {
304  struct Track *first_track = adaptation_sets[set][i];
305  int width = 0, height = 0, sample_rate = 0, channels = 0, bitrate = 0;
306  fprintf(out, "\t\t\t<Representation id=\"%d\" codecs=\"", i);
307  for (j = i; j < nb_tracks[set]; j++) {
308  struct Track *track = adaptation_sets[set][j];
309  if (strcmp(track->name, first_track->name))
310  break;
311  if (track->is_audio) {
312  sample_rate = track->sample_rate;
313  channels = track->channels;
314  }
315  if (track->is_video) {
316  width = track->width;
317  height = track->height;
318  }
319  bitrate += track->bitrate;
320  if (j > i)
321  fprintf(out, ",");
322  fprintf(out, "%s", track->codec_str);
323  }
324  fprintf(out, "\" mimeType=\"%s/mp4\" bandwidth=\"%d\"",
325  width ? "video" : "audio", bitrate);
326  if (width > 0 && height > 0)
327  fprintf(out, " width=\"%d\" height=\"%d\"", width, height);
328  if (sample_rate > 0)
329  fprintf(out, " audioSamplingRate=\"%d\"", sample_rate);
330  fprintf(out, ">\n");
331  if (channels > 0)
332  fprintf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", channels);
333  fprintf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", first_track->name);
334  fprintf(out, "\t\t\t\t<SegmentBase indexRange=\"%"PRId64"-%"PRId64"\" />\n", first_track->sidx_start, first_track->sidx_start + first_track->sidx_length - 1);
335  fprintf(out, "\t\t\t</Representation>\n");
336  i = j;
337  }
338  fprintf(out, "\t\t</AdaptationSet>\n");
339  }
340  fprintf(out, "\t</Period>\n");
341  fprintf(out, "</MPD>\n");
342 
343  fclose(out);
344 err:
345  for (i = 0; i < 2; i++)
346  av_free(adaptation_sets_buf[i]);
347  return ret;
348 }
349 
350 static void clean_tracks(struct Tracks *tracks)
351 {
352  int i;
353  for (i = 0; i < tracks->nb_tracks; i++) {
354  av_freep(&tracks->tracks[i]);
355  }
356  av_freep(&tracks->tracks);
357  tracks->nb_tracks = 0;
358 }
359 
360 int main(int argc, char **argv)
361 {
362  const char *out = NULL;
363  struct Tracks tracks = { 0 };
364  int i;
365 
366  for (i = 1; i < argc; i++) {
367  if (!strcmp(argv[i], "-out")) {
368  out = argv[i + 1];
369  i++;
370  } else if (argv[i][0] == '-') {
371  return usage(argv[0], 1);
372  } else {
373  if (handle_file(&tracks, argv[i]))
374  return 1;
375  }
376  }
377  if (!tracks.nb_tracks || !out)
378  return usage(argv[0], 1);
379 
380  output_mpd(&tracks, out);
381 
382  clean_tracks(&tracks);
383 
384  return 0;
385 }
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
else temp
Definition: vf_mcdeint.c:256
channels
Definition: aptx.c:30
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3899
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
#define AVIO_FLAG_READ
read-only
Definition: avio.h:654
static void clean_tracks(struct Tracks *tracks)
Definition: sidxindex.c:350
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
int is_audio
Definition: ismindex.c:74
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
AVRounding
Rounding methods.
Definition: mathematics.h:79
static void set(uint8_t *a[], int ch, int index, int ch_count, enum AVSampleFormat f, double v)
Definition: swresample.c:59
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3891
int height
Definition: ismindex.c:75
Format I/O context.
Definition: avformat.h:1351
int main(int argc, char **argv)
Definition: sidxindex.c:360
Round toward +infinity.
Definition: mathematics.h:83
static int find_sidx(struct Tracks *tracks, int start_index, const char *file)
Definition: sidxindex.c:78
int width
Video only.
Definition: avcodec.h:3965
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:801
#define f(width, name)
Definition: cbs_vp9.c:255
int id
Format-specific stream ID.
Definition: avformat.h:881
int bitrate
Definition: ismindex.c:72
int nb_tracks
Definition: ismindex.c:88
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
#define height
uint32_t tag
Definition: movenc.c:1483
static void write_time(FILE *out, int64_t time, int decimals, enum AVRounding round)
Definition: sidxindex.c:216
Definition: ismindex.c:69
ptrdiff_t size
Definition: opengl_enc.c:101
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
void * av_realloc_array(void *ptr, size_t nmemb, size_t size)
Definition: mem.c:198
int width
Definition: ismindex.c:75
char codec_str[30]
Definition: sidxindex.c:44
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3928
int is_video
Definition: ismindex.c:74
int channels
Definition: ismindex.c:77
#define AVERROR(e)
Definition: error.h:43
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
Definition: aviobuf.c:1190
static int output_mpd(struct Tracks *tracks, const char *filename)
Definition: sidxindex.c:233
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3895
static int usage(const char *argv0, int ret)
Definition: sidxindex.c:29
int sample_rate
Definition: ismindex.c:77
int64_t sidx_start
Definition: sidxindex.c:45
static av_always_inline av_const double round(double x)
Definition: libm.h:444
static void set_codec_str(AVCodecParameters *codecpar, char *str, int size)
Definition: sidxindex.c:55
int64_t duration
Definition: ismindex.c:89
#define FFMAX(a, b)
Definition: common.h:94
#define fail()
Definition: checkasm.h:117
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3917
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1407
#define AV_TIME_BASE
Internal time base represented as integer.
Definition: avutil.h:254
#define width
int32_t
AVFormatContext * ctx
Definition: movenc.c:48
int multiple_tracks_per_file
Definition: sidxindex.c:52
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
Rescale a 64-bit integer with specified rounding.
Definition: mathematics.c:58
Stream structure.
Definition: avformat.h:874
sample_rate
const char * name
Definition: ismindex.c:70
int64_t duration
Definition: ismindex.c:71
int timescale
Definition: ismindex.c:81
size_t av_strlcatf(char *dst, size_t size, const char *fmt,...)
Definition: avstring.c:101
int avio_open2(AVIOContext **s, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
Create and initialize a AVIOContext for accessing the resource indicated by url.
Definition: aviobuf.c:1178
#define snprintf
Definition: snprintf.h:34
struct Track ** tracks
Definition: ismindex.c:90
Round toward -infinity.
Definition: mathematics.h:82
int track_id
Definition: ismindex.c:73
int64_t sidx_length
Definition: sidxindex.c:45
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
Definition: error.c:105
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:923
int sample_rate
Audio only.
Definition: avcodec.h:4009
int64_t bitrate
Definition: h264_levels.c:89
Main libavformat public API header.
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3563
int den
Denominator.
Definition: rational.h:60
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4426
#define MKBETAG(a, b, c, d)
Definition: common.h:367
static int handle_file(struct Tracks *tracks, const char *file)
Definition: sidxindex.c:117
#define av_free(p)
int eof_reached
true if eof reached
Definition: avio.h:239
int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:537
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3913
int channels
Audio only.
Definition: avcodec.h:4005
FILE * out
Definition: movenc.c:54
#define av_freep(p)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1021
#define av_malloc_array(a, b)
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:903