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 };
  47
  48 struct Tracks {
  49     int nb_tracks;
  50     int64_t duration;
  51     struct Track **tracks;
  52     int multiple_tracks_per_file;
  53 };
  54
  55 static void set_codec_str(AVCodecContext *codec, char *str, int size)
  56 {
  57     switch (codec->codec_id) {
  58     case AV_CODEC_ID_H264:
  59         snprintf(str, size, "avc1");
  60         if (codec->extradata_size >= 4 && codec->extradata[0] == 1) {
  61             av_strlcatf(str, size, ".%02x%02x%02x",
  62                         codec->extradata[1], codec->extradata[2], codec->extradata[3]);
  63         }
  64         break;
  65     case AV_CODEC_ID_AAC:
  66         snprintf(str, size, "mp4a.40"); // 0x40 is the mp4 object type for AAC
  67         if (codec->extradata_size >= 2) {
  68             int aot = codec->extradata[0] >> 3;
  69             if (aot == 31)
  70                 aot = ((AV_RB16(codec->extradata) >> 5) & 0x3f) + 32;
  71             av_strlcatf(str, size, ".%d", aot);
  72         }
  73         break;
  74     }
  75 }
  76
  77 static int find_sidx(struct Tracks *tracks, int start_index,
  78                      const char *file)
  79 {
  80     int err = 0;
  81     AVIOContext *f = NULL;
  82     int i;
  83
  84     if ((err = avio_open2(&f, file, AVIO_FLAG_READ, NULL, NULL)) < 0)
  85         goto fail;
  86
  87     while (!f->eof_reached) {
  88         int64_t pos = avio_tell(f);
  89         int32_t size, tag;
  90
  91         size = avio_rb32(f);
  92         tag  = avio_rb32(f);
  93         if (size < 8)
  94             break;
  95         if (tag == MKBETAG('s', 'i', 'd', 'x')) {
  96             for (i = start_index; i < tracks->nb_tracks; i++) {
  97                 struct Track *track = tracks->tracks[i];
  98                 if (!track->sidx_start) {
  99                     track->sidx_start  = pos;
 100                     track->sidx_length = size;
 101                 } else if (pos == track->sidx_start + track->sidx_length) {
 102                     track->sidx_length = pos + size - track->sidx_start;
 103                 }
 104             }
 105         }
 106         if (avio_seek(f, pos + size, SEEK_SET) != pos + size)
 107             break;
 108     }
 109
 110 fail:
 111     if (f)
 112         avio_close(f);
 113     return err;
 114 }
 115
 116 static int handle_file(struct Tracks *tracks, const char *file)
 117 {
 118     AVFormatContext *ctx = NULL;
 119     int err = 0, i, orig_tracks = tracks->nb_tracks;
 120     char errbuf[50], *ptr;
 121     struct Track *track;
 122
 123     err = avformat_open_input(&ctx, file, NULL, NULL);
 124     if (err < 0) {
 125         av_strerror(err, errbuf, sizeof(errbuf));
 126         fprintf(stderr, "Unable to open %s: %s\n", file, errbuf);
 127         return 1;
 128     }
 129
 130     err = avformat_find_stream_info(ctx, NULL);
 131     if (err < 0) {
 132         av_strerror(err, errbuf, sizeof(errbuf));
 133         fprintf(stderr, "Unable to identify %s: %s\n", file, errbuf);
 134         goto fail;
 135     }
 136
 137     if (ctx->nb_streams < 1) {
 138         fprintf(stderr, "No streams found in %s\n", file);
 139         goto fail;
 140     }
 141     if (ctx->nb_streams > 1)
 142         tracks->multiple_tracks_per_file = 1;
 143
 144     for (i = 0; i < ctx->nb_streams; i++) {
 145         struct Track **temp;
 146         AVStream *st = ctx->streams[i];
 147
 148         if (st->codec->bit_rate == 0) {
 149             fprintf(stderr, "Skipping track %d in %s as it has zero bitrate\n",
 150                     st->id, file);
 151             continue;
 152         }
 153
 154         track = av_mallocz(sizeof(*track));
 155         if (!track) {
 156             err = AVERROR(ENOMEM);
 157             goto fail;
 158         }
 159         temp = av_realloc(tracks->tracks,
 160                           sizeof(*tracks->tracks) * (tracks->nb_tracks + 1));
 161         if (!temp) {
 162             av_free(track);
 163             err = AVERROR(ENOMEM);
 164             goto fail;
 165         }
 166         tracks->tracks = temp;
 167         tracks->tracks[tracks->nb_tracks] = track;
 168
 169         track->name = file;
 170         if ((ptr = strrchr(file, '/')))
 171             track->name = ptr + 1;
 172
 173         track->bitrate   = st->codec->bit_rate;
 174         track->track_id  = st->id;
 175         track->timescale = st->time_base.den;
 176         track->duration  = st->duration;
 177         track->is_audio  = st->codec->codec_type == AVMEDIA_TYPE_AUDIO;
 178         track->is_video  = st->codec->codec_type == AVMEDIA_TYPE_VIDEO;
 179
 180         if (!track->is_audio && !track->is_video) {
 181             fprintf(stderr,
 182                     "Track %d in %s is neither video nor audio, skipping\n",
 183                     track->track_id, file);
 184             av_freep(&tracks->tracks[tracks->nb_tracks]);
 185             continue;
 186         }
 187
 188         tracks->duration = FFMAX(tracks->duration,
 189                                  av_rescale_rnd(track->duration, AV_TIME_BASE,
 190                                                 track->timescale, AV_ROUND_UP));
 191
 192         if (track->is_audio) {
 193             track->channels    = st->codec->channels;
 194             track->sample_rate = st->codec->sample_rate;
 195         }
 196         if (track->is_video) {
 197             track->width  = st->codec->width;
 198             track->height = st->codec->height;
 199         }
 200         set_codec_str(st->codec, track->codec_str, sizeof(track->codec_str));
 201
 202         tracks->nb_tracks++;
 203     }
 204
 205     avformat_close_input(&ctx);
 206
 207     err = find_sidx(tracks, orig_tracks, file);
 208
 209 fail:
 210     if (ctx)
 211         avformat_close_input(&ctx);
 212     return err;
 213 }
 214
 215 static void write_time(FILE *out, int64_t time, int decimals, enum AVRounding round)
 216 {
 217     int seconds = time / AV_TIME_BASE;
 218     int fractions = time % AV_TIME_BASE;
 219     int minutes = seconds / 60;
 220     int hours = minutes / 60;
 221     fractions = av_rescale_rnd(fractions, pow(10, decimals), AV_TIME_BASE, round);
 222     seconds %= 60;
 223     minutes %= 60;
 224     fprintf(out, "PT");
 225     if (hours)
 226         fprintf(out, "%dH", hours);
 227     if (hours || minutes)
 228         fprintf(out, "%dM", minutes);
 229     fprintf(out, "%d.%0*dS", seconds, decimals, fractions);
 230 }
 231
 232 static int output_mpd(struct Tracks *tracks, const char *filename)
 233 {
 234     FILE *out;
 235     int i, j, ret = 0;
 236     struct Track **adaptation_sets_buf[2] = { NULL };
 237     struct Track ***adaptation_sets;
 238     int nb_tracks_buf[2] = { 0 };
 239     int *nb_tracks;
 240     int set, nb_sets;
 241
 242     if (!tracks->multiple_tracks_per_file) {
 243         adaptation_sets = adaptation_sets_buf;
 244         nb_tracks = nb_tracks_buf;
 245         nb_sets = 2;
 246         for (i = 0; i < 2; i++) {
 247             adaptation_sets[i] = av_malloc(sizeof(*adaptation_sets[i]) * tracks->nb_tracks);
 248             if (!adaptation_sets[i]) {
 249                 ret = AVERROR(ENOMEM);
 250                 goto err;
 251             }
 252         }
 253         for (i = 0; i < tracks->nb_tracks; i++) {
 254             int set_index = -1;
 255             if (tracks->tracks[i]->is_video)
 256                 set_index = 0;
 257             else if (tracks->tracks[i]->is_audio)
 258                 set_index = 1;
 259             else
 260                 continue;
 261             adaptation_sets[set_index][nb_tracks[set_index]++] = tracks->tracks[i];
 262         }
 263     } else {
 264         adaptation_sets = &tracks->tracks;
 265         nb_tracks = &tracks->nb_tracks;
 266         nb_sets = 1;
 267     }
 268
 269     out = fopen(filename, "w");
 270     if (!out) {
 271         ret = AVERROR(errno);
 272         perror(filename);
 273         return ret;
 274     }
 275     fprintf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
 276     fprintf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
 277                 "\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
 278                 "\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
 279                 "\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
 280                 "\tprofiles=\"urn:mpeg:dash:profile:isoff-on-demand:2011\"\n"
 281                 "\ttype=\"static\"\n");
 282     fprintf(out, "\tmediaPresentationDuration=\"");
 283     write_time(out, tracks->duration, 1, AV_ROUND_DOWN);
 284     fprintf(out, "\"\n");
 285     fprintf(out, "\tminBufferTime=\"PT5S\">\n");
 286
 287     fprintf(out, "\t<Period start=\"PT0.0S\">\n");
 288
 289     for (set = 0; set < nb_sets; set++) {
 290         if (nb_tracks[set] == 0)
 291             continue;
 292         fprintf(out, "\t\t<AdaptationSet segmentAlignment=\"true\">\n");
 293         if (nb_sets == 1) {
 294             for (i = 0; i < nb_tracks[set]; i++) {
 295                 struct Track *track = adaptation_sets[set][i];
 296                 if (strcmp(track->name, adaptation_sets[set][0]->name))
 297                     break;
 298                 fprintf(out, "\t\t\t<ContentComponent id=\"%d\" contentType=\"%s\" />\n", track->track_id, track->is_audio ? "audio" : "video");
 299             }
 300         }
 301
 302         for (i = 0; i < nb_tracks[set]; ) {
 303             struct Track *first_track = adaptation_sets[set][i];
 304             int width = 0, height = 0, sample_rate = 0, channels = 0, bitrate = 0;
 305             fprintf(out, "\t\t\t<Representation id=\"%d\" codecs=\"", i);
 306             for (j = i; j < nb_tracks[set]; j++) {
 307                 struct Track *track = adaptation_sets[set][j];
 308                 if (strcmp(track->name, first_track->name))
 309                     break;
 310                 if (track->is_audio) {
 311                     sample_rate = track->sample_rate;
 312                     channels = track->channels;
 313                 }
 314                 if (track->is_video) {
 315                     width = track->width;
 316                     height = track->height;
 317                 }
 318                 bitrate += track->bitrate;
 319                 if (j > i)
 320                     fprintf(out, ",");
 321                 fprintf(out, "%s", track->codec_str);
 322             }
 323             fprintf(out, "\" mimeType=\"%s/mp4\" bandwidth=\"%d\"",
 324                     width ? "video" : "audio", bitrate);
 325             if (width > 0 && height > 0)
 326                 fprintf(out, " width=\"%d\" height=\"%d\"", width, height);
 327             if (sample_rate > 0)
 328                 fprintf(out, " audioSamplingRate=\"%d\"", sample_rate);
 329             fprintf(out, ">\n");
 330             if (channels > 0)
 331                 fprintf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", channels);
 332             fprintf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", first_track->name);
 333             fprintf(out, "\t\t\t\t<SegmentBase indexRange=\"%"PRId64"-%"PRId64"\" />\n", first_track->sidx_start, first_track->sidx_start + first_track->sidx_length - 1);
 334             fprintf(out, "\t\t\t</Representation>\n");
 335             i = j;
 336         }
 337         fprintf(out, "\t\t</AdaptationSet>\n");
 338     }
 339     fprintf(out, "\t</Period>\n");
 340     fprintf(out, "</MPD>\n");
 341
 342     fclose(out);
 343 err:
 344     for (i = 0; i < 2; i++)
 345         av_free(adaptation_sets_buf[i]);
 346     return ret;
 347 }
 348
 349 static void clean_tracks(struct Tracks *tracks)
 350 {
 351     int i;
 352     for (i = 0; i < tracks->nb_tracks; i++) {
 353         av_freep(&tracks->tracks[i]);
 354     }
 355     av_freep(&tracks->tracks);
 356     tracks->nb_tracks = 0;
 357 }
 358
 359 int main(int argc, char **argv)
 360 {
 361     const char *out = NULL;
 362     struct Tracks tracks = { 0 };
 363     int i;
 364
 365     av_register_all();
 366
 367     for (i = 1; i < argc; i++) {
 368         if (!strcmp(argv[i], "-out")) {
 369             out = argv[i + 1];
 370             i++;
 371         } else if (argv[i][0] == '-') {
 372             return usage(argv[0], 1);
 373         } else {
 374             if (handle_file(&tracks, argv[i]))
 375                 return 1;
 376         }
 377     }
 378     if (!tracks.nb_tracks || !out)
 379         return usage(argv[0], 1);
 380
 381     output_mpd(&tracks, out);
 382
 383     clean_tracks(&tracks);
 384
 385     return 0;
 386 }