git.sesse.net Git - ffmpeg/blob - tools/sidxindex.c

   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];
  45     int64_t sidx_start, sidx_length;
  46     int64_t  earliest_presentation;
  47     uint32_t earliest_presentation_timescale;
  48 };
  49
  50 struct Tracks {
  51     int nb_tracks;
  52     int64_t duration;
  53     struct Track **tracks;
  54     int multiple_tracks_per_file;
  55 };
  56
  57 static void set_codec_str(AVCodecContext *codec, char *str, int size)
  58 {
  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]);
  65         }
  66         break;
  67     case AV_CODEC_ID_AAC:
  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;
  71             if (aot == 31)
  72                 aot = ((AV_RB16(codec->extradata) >> 5) & 0x3f) + 32;
  73             av_strlcatf(str, size, ".%d", aot);
  74         }
  75         break;
  76     }
  77 }
  78
  79 static int find_sidx(struct Tracks *tracks, int start_index,
  80                      const char *file)
  81 {
  82     int err = 0;
  83     AVIOContext *f = NULL;
  84     int i;
  85
  86     if ((err = avio_open2(&f, file, AVIO_FLAG_READ, NULL, NULL)) < 0)
  87         goto fail;
  88
  89     while (!f->eof_reached) {
  90         int64_t pos = avio_tell(f);
  91         int32_t size, tag;
  92
  93         size = avio_rb32(f);
  94         tag  = avio_rb32(f);
  95         if (size < 8)
  96             break;
  97         if (tag == MKBETAG('s', 'i', 'd', 'x')) {
  98             int version, track_id;
  99             uint32_t timescale;
 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;
 113                 }
 114                 if (track->track_id == track_id) {
 115                     track->earliest_presentation = earliest_presentation;
 116                     track->earliest_presentation_timescale = timescale;
 117                 }
 118             }
 119         }
 120         if (avio_seek(f, pos + size, SEEK_SET) != pos + size)
 121             break;
 122     }
 123
 124 fail:
 125     if (f)
 126         avio_close(f);
 127     return err;
 128 }
 129
 130 static int handle_file(struct Tracks *tracks, const char *file)
 131 {
 132     AVFormatContext *ctx = NULL;
 133     int err = 0, i, orig_tracks = tracks->nb_tracks;
 134     char errbuf[50], *ptr;
 135     struct Track *track;
 136
 137     err = avformat_open_input(&ctx, file, NULL, NULL);
 138     if (err < 0) {
 139         av_strerror(err, errbuf, sizeof(errbuf));
 140         fprintf(stderr, "Unable to open %s: %s\n", file, errbuf);
 141         return 1;
 142     }
 143
 144     err = avformat_find_stream_info(ctx, NULL);
 145     if (err < 0) {
 146         av_strerror(err, errbuf, sizeof(errbuf));
 147         fprintf(stderr, "Unable to identify %s: %s\n", file, errbuf);
 148         goto fail;
 149     }
 150
 151     if (ctx->nb_streams < 1) {
 152         fprintf(stderr, "No streams found in %s\n", file);
 153         goto fail;
 154     }
 155     if (ctx->nb_streams > 1)
 156         tracks->multiple_tracks_per_file = 1;
 157
 158     for (i = 0; i < ctx->nb_streams; i++) {
 159         struct Track **temp;
 160         AVStream *st = ctx->streams[i];
 161
 162         if (st->codec->bit_rate == 0) {
 163             fprintf(stderr, "Skipping track %d in %s as it has zero bitrate\n",
 164                     st->id, file);
 165             continue;
 166         }
 167
 168         track = av_mallocz(sizeof(*track));
 169         if (!track) {
 170             err = AVERROR(ENOMEM);
 171             goto fail;
 172         }
 173         temp = av_realloc(tracks->tracks,
 174                           sizeof(*tracks->tracks) * (tracks->nb_tracks + 1));
 175         if (!temp) {
 176             av_free(track);
 177             err = AVERROR(ENOMEM);
 178             goto fail;
 179         }
 180         tracks->tracks = temp;
 181         tracks->tracks[tracks->nb_tracks] = track;
 182
 183         track->name = file;
 184         if ((ptr = strrchr(file, '/')))
 185             track->name = ptr + 1;
 186
 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;
 193
 194         if (!track->is_audio && !track->is_video) {
 195             fprintf(stderr,
 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]);
 199             continue;
 200         }
 201
 202         tracks->duration = FFMAX(tracks->duration,
 203                                  av_rescale_rnd(track->duration, AV_TIME_BASE,
 204                                                 track->timescale, AV_ROUND_UP));
 205
 206         if (track->is_audio) {
 207             track->channels    = st->codec->channels;
 208             track->sample_rate = st->codec->sample_rate;
 209         }
 210         if (track->is_video) {
 211             track->width  = st->codec->width;
 212             track->height = st->codec->height;
 213         }
 214         set_codec_str(st->codec, track->codec_str, sizeof(track->codec_str));
 215
 216         tracks->nb_tracks++;
 217     }
 218
 219     avformat_close_input(&ctx);
 220
 221     err = find_sidx(tracks, orig_tracks, file);
 222
 223 fail:
 224     if (ctx)
 225         avformat_close_input(&ctx);
 226     return err;
 227 }
 228
 229 static void write_time(FILE *out, int64_t time, int decimals, enum AVRounding round)
 230 {
 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);
 236     seconds %= 60;
 237     minutes %= 60;
 238     fprintf(out, "PT");
 239     if (hours)
 240         fprintf(out, "%dH", hours);
 241     if (hours || minutes)
 242         fprintf(out, "%dM", minutes);
 243     fprintf(out, "%d.%0*dS", seconds, decimals, fractions);
 244 }
 245
 246 static int output_mpd(struct Tracks *tracks, const char *filename)
 247 {
 248     FILE *out;
 249     int i, j, ret = 0;
 250     struct Track **adaptation_sets_buf[2] = { NULL };
 251     struct Track ***adaptation_sets;
 252     int nb_tracks_buf[2] = { 0 };
 253     int *nb_tracks;
 254     int set, nb_sets;
 255
 256     if (!tracks->multiple_tracks_per_file) {
 257         adaptation_sets = adaptation_sets_buf;
 258         nb_tracks = nb_tracks_buf;
 259         nb_sets = 2;
 260         for (i = 0; i < 2; i++) {
 261             adaptation_sets[i] = av_malloc(sizeof(*adaptation_sets[i]) * tracks->nb_tracks);
 262             if (!adaptation_sets[i]) {
 263                 ret = AVERROR(ENOMEM);
 264                 goto err;
 265             }
 266         }
 267         for (i = 0; i < tracks->nb_tracks; i++) {
 268             int set_index = -1;
 269             if (tracks->tracks[i]->is_video)
 270                 set_index = 0;
 271             else if (tracks->tracks[i]->is_audio)
 272                 set_index = 1;
 273             else
 274                 continue;
 275             adaptation_sets[set_index][nb_tracks[set_index]++] = tracks->tracks[i];
 276         }
 277     } else {
 278         adaptation_sets = &tracks->tracks;
 279         nb_tracks = &tracks->nb_tracks;
 280         nb_sets = 1;
 281     }
 282
 283     out = fopen(filename, "w");
 284     if (!out) {
 285         ret = AVERROR(errno);
 286         perror(filename);
 287         return ret;
 288     }
 289     fprintf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
 290     fprintf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
 291                 "\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
 292                 "\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
 293                 "\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
 294                 "\tprofiles=\"urn:mpeg:dash:profile:isoff-on-demand:2011\"\n"
 295                 "\ttype=\"static\"\n");
 296     fprintf(out, "\tmediaPresentationDuration=\"");
 297     write_time(out, tracks->duration, 1, AV_ROUND_DOWN);
 298     fprintf(out, "\"\n");
 299     fprintf(out, "\tminBufferTime=\"PT5S\">\n");
 300
 301     fprintf(out, "\t<Period start=\"PT0.0S\">\n");
 302
 303     for (set = 0; set < nb_sets; set++) {
 304         if (nb_tracks[set] == 0)
 305             continue;
 306         fprintf(out, "\t\t<AdaptationSet segmentAlignment=\"true\">\n");
 307         if (nb_sets == 1) {
 308             for (i = 0; i < nb_tracks[set]; i++) {
 309                 struct Track *track = adaptation_sets[set][i];
 310                 if (strcmp(track->name, adaptation_sets[set][0]->name))
 311                     break;
 312                 fprintf(out, "\t\t\t<ContentComponent id=\"%d\" contentType=\"%s\" />\n", track->track_id, track->is_audio ? "audio" : "video");
 313             }
 314         }
 315
 316         for (i = 0; i < nb_tracks[set]; ) {
 317             struct Track *first_track = adaptation_sets[set][i];
 318             int width = 0, height = 0, sample_rate = 0, channels = 0, bitrate = 0;
 319             fprintf(out, "\t\t\t<Representation id=\"%d\" codecs=\"", i);
 320             for (j = i; j < nb_tracks[set]; j++) {
 321                 struct Track *track = adaptation_sets[set][j];
 322                 if (strcmp(track->name, first_track->name))
 323                     break;
 324                 if (track->is_audio) {
 325                     sample_rate = track->sample_rate;
 326                     channels = track->channels;
 327                 }
 328                 if (track->is_video) {
 329                     width = track->width;
 330                     height = track->height;
 331                 }
 332                 bitrate += track->bitrate;
 333                 if (j > i)
 334                     fprintf(out, ",");
 335                 fprintf(out, "%s", track->codec_str);
 336             }
 337             fprintf(out, "\" mimeType=\"%s/mp4\" bandwidth=\"%d\"",
 338                     width ? "video" : "audio", bitrate);
 339             if (width > 0 && height > 0)
 340                 fprintf(out, " width=\"%d\" height=\"%d\"", width, height);
 341             if (sample_rate > 0)
 342                 fprintf(out, " audioSamplingRate=\"%d\"", sample_rate);
 343             fprintf(out, ">\n");
 344             if (channels > 0)
 345                 fprintf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", channels);
 346             fprintf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", first_track->name);
 347             fprintf(out, "\t\t\t\t<SegmentBase indexRange=\"%"PRId64"-%"PRId64"\" />\n", first_track->sidx_start, first_track->sidx_start + first_track->sidx_length - 1);
 348             fprintf(out, "\t\t\t</Representation>\n");
 349             i = j;
 350         }
 351         fprintf(out, "\t\t</AdaptationSet>\n");
 352     }
 353     fprintf(out, "\t</Period>\n");
 354     fprintf(out, "</MPD>\n");
 355
 356     fclose(out);
 357 err:
 358     for (i = 0; i < 2; i++)
 359         av_free(adaptation_sets_buf[i]);
 360     return ret;
 361 }
 362
 363 static void clean_tracks(struct Tracks *tracks)
 364 {
 365     int i;
 366     for (i = 0; i < tracks->nb_tracks; i++) {
 367         av_freep(&tracks->tracks[i]);
 368     }
 369     av_freep(&tracks->tracks);
 370     tracks->nb_tracks = 0;
 371 }
 372
 373 int main(int argc, char **argv)
 374 {
 375     const char *out = NULL;
 376     struct Tracks tracks = { 0 };
 377     int i;
 378
 379     av_register_all();
 380
 381     for (i = 1; i < argc; i++) {
 382         if (!strcmp(argv[i], "-out")) {
 383             out = argv[i + 1];
 384             i++;
 385         } else if (argv[i][0] == '-') {
 386             return usage(argv[0], 1);
 387         } else {
 388             if (handle_file(&tracks, argv[i]))
 389                 return 1;
 390         }
 391     }
 392     if (!tracks.nb_tracks || !out)
 393         return usage(argv[0], 1);
 394
 395     output_mpd(&tracks, out);
 396
 397     clean_tracks(&tracks);
 398
 399     return 0;
 400 }