FFmpeg: tools/sidxindex.c Source File

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sidxindex.c

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1 /*

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 */

21 #include <stdio.h>

22 #include <string.h>

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)

30 {

31 fprintf(stderr, "%s -out foo.mpd file1\n", argv0);

32 return ret;

33 }

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 };

48 struct Tracks {

49 int nb_tracks;

50 int64_t duration;

51 struct Track **tracks;

52 int multiple_tracks_per_file;

53 };

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 }

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;

84 if ((err = avio_open2(&f, file, AVIO_FLAG_READ, NULL, NULL)) < 0)

85 goto fail;

87 while (!f->eof_reached) {

88 int64_t pos = avio_tell(f);

89 int32_t size, tag;

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 }

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