FFmpeg: libavformat/r3d.c Source File

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libavformat

r3d.c

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1 /*

2 * R3D REDCODE demuxer

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg is free software; you can redistribute it and/or

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

12 * FFmpeg is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

18 * License along with FFmpeg; if not, write to the Free Software

19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

20 */

22 #include "libavutil/intreadwrite.h"

23 #include "libavutil/dict.h"

24 #include "libavutil/mathematics.h"

25 #include "avformat.h"

26 #include "internal.h"

28 typedef struct R3DContext {

29 unsigned video_offsets_count;

30 unsigned *video_offsets;

31 unsigned rdvo_offset;

32 } R3DContext;

34 typedef struct Atom {

35 unsigned size;

36 uint32_t tag;

37 uint64_t offset;

38 } Atom;

40 static int read_atom(AVFormatContext *s, Atom *atom)

41 {

42 atom->offset = avio_tell(s->pb);

43 atom->size = avio_rb32(s->pb);

44 if (atom->size < 8)

45 return -1;

46 atom->tag = avio_rl32(s->pb);

47 av_dlog(s, "atom %u %.4s offset %#"PRIx64"\n",

48 atom->size, (char*)&atom->tag, atom->offset);

49 return atom->size;

50 }

52 static int r3d_read_red1(AVFormatContext *s)

53 {

54 AVStream *st = avformat_new_stream(s, NULL);

55 char filename[258];

56 int tmp;

57 int av_unused tmp2;

58 AVRational framerate;

60 if (!st)

61 return AVERROR(ENOMEM);

62 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

63 st->codec->codec_id = AV_CODEC_ID_JPEG2000;

65 tmp = avio_r8(s->pb); // major version

66 tmp2 = avio_r8(s->pb); // minor version

67 av_dlog(s, "version %d.%d\n", tmp, tmp2);

69 tmp = avio_rb16(s->pb); // unknown

70 av_dlog(s, "unknown1 %d\n", tmp);

72 tmp = avio_rb32(s->pb);

73 avpriv_set_pts_info(st, 32, 1, tmp);

75 tmp = avio_rb32(s->pb); // filenum

76 av_dlog(s, "filenum %d\n", tmp);

78 avio_skip(s->pb, 32); // unknown

80 st->codec->width = avio_rb32(s->pb);

81 st->codec->height = avio_rb32(s->pb);

83 tmp = avio_rb16(s->pb); // unknown

84 av_dlog(s, "unknown2 %d\n", tmp);

86 framerate.num = avio_rb16(s->pb);

87 framerate.den = avio_rb16(s->pb);

88 if (framerate.num > 0 && framerate.den > 0) {

89 #if FF_API_R_FRAME_RATE

90 st->r_frame_rate =

91 #endif

92 st->avg_frame_rate = framerate;

93 }

95 tmp = avio_r8(s->pb); // audio channels

96 av_dlog(s, "audio channels %d\n", tmp);

97 if (tmp > 0) {

98 AVStream *ast = avformat_new_stream(s, NULL);

99 if (!ast)

100 return AVERROR(ENOMEM);

101 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;

102 ast->codec->codec_id = AV_CODEC_ID_PCM_S32BE;

103 ast->codec->channels = tmp;

104 avpriv_set_pts_info(ast, 32, 1, st->time_base.den);

105 }

106

107 avio_read(s->pb, filename, 257);

108 filename[sizeof(filename)-1] = 0;

109 av_dict_set(&st->metadata, "filename", filename, 0);

110

111 av_dlog(s, "filename %s\n", filename);

112 av_dlog(s, "resolution %dx%d\n", st->codec->width, st->codec->height);

113 av_dlog(s, "timescale %d\n", st->time_base.den);

114 av_dlog(s, "frame rate %d/%d\n",

115 framerate.num, framerate.den);

116

117 return 0;

118 }

119

120 static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)

121 {

122 R3DContext *r3d = s->priv_data;

123 AVStream *st = s->streams[0];

124 int i;

125

126 r3d->video_offsets_count = (atom->size - 8) / 4;

127 r3d->video_offsets = av_malloc(atom->size);

128 if (!r3d->video_offsets)

129 return AVERROR(ENOMEM);

130

131 for (i = 0; i < r3d->video_offsets_count; i++) {

132 r3d->video_offsets[i] = avio_rb32(s->pb);

133 if (!r3d->video_offsets[i]) {

134 r3d->video_offsets_count = i;

135 break;

136 }

137 av_dlog(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);

138 }

139

140 if (st->avg_frame_rate.num)

141 st->duration = av_rescale_q(r3d->video_offsets_count,

142 av_inv_q(st->avg_frame_rate),

143 st->time_base);

144 av_dlog(s, "duration %"PRId64"\n", st->duration);

145

146 return 0;

147 }

148

149 static void r3d_read_reos(AVFormatContext *s)

150 {

151 R3DContext *r3d = s->priv_data;

152 int av_unused tmp;

153

154 r3d->rdvo_offset = avio_rb32(s->pb);

155 avio_rb32(s->pb); // rdvs offset

156 avio_rb32(s->pb); // rdao offset

157 avio_rb32(s->pb); // rdas offset

158

159 tmp = avio_rb32(s->pb);

160 av_dlog(s, "num video chunks %d\n", tmp);

161

162 tmp = avio_rb32(s->pb);

163 av_dlog(s, "num audio chunks %d\n", tmp);

164

165 avio_skip(s->pb, 6*4);

166 }

167

168 static int r3d_read_header(AVFormatContext *s)

169 {

170 R3DContext *r3d = s->priv_data;

171 Atom atom;

172 int ret;

173

174 if (read_atom(s, &atom) < 0) {

175 av_log(s, AV_LOG_ERROR, "error reading atom\n");

176 return -1;

177 }

178 if (atom.tag == MKTAG('R','E','D','1')) {

179 if ((ret = r3d_read_red1(s)) < 0) {

180 av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");

181 return ret;

182 }

183 } else {

184 av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");

185 return -1;

186 }

187

188 s->internal->data_offset = avio_tell(s->pb);

189 av_dlog(s, "data offset %#"PRIx64"\n", s->internal->data_offset);

190 if (!s->pb->seekable)

191 return 0;

192 // find REOB/REOF/REOS to load index

193 avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);

194 if (read_atom(s, &atom) < 0)

195 av_log(s, AV_LOG_ERROR, "error reading end atom\n");

196

197 if (atom.tag != MKTAG('R','E','O','B') &&

198 atom.tag != MKTAG('R','E','O','F') &&

199 atom.tag != MKTAG('R','E','O','S'))

200 goto out;

201

202 r3d_read_reos(s);

203

204 if (r3d->rdvo_offset) {

205 avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);

206 if (read_atom(s, &atom) < 0)

207 av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");

208 if (atom.tag == MKTAG('R','D','V','O')) {

209 if (r3d_read_rdvo(s, &atom) < 0)

210 av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");

211 }

212 }

213

214 out:

215 avio_seek(s->pb, s->internal->data_offset, SEEK_SET);

216 return 0;

217 }

218

219 static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)

220 {

221 AVStream *st = s->streams[0];

222 int tmp;

223 int av_unused tmp2;

224 int64_t pos = avio_tell(s->pb);

225 unsigned dts;

226 int ret;

227

228 dts = avio_rb32(s->pb);

229

230 tmp = avio_rb32(s->pb);

231 av_dlog(s, "frame num %d\n", tmp);

232

233 tmp = avio_r8(s->pb); // major version

234 tmp2 = avio_r8(s->pb); // minor version

235 av_dlog(s, "version %d.%d\n", tmp, tmp2);

236

237 tmp = avio_rb16(s->pb); // unknown

238 av_dlog(s, "unknown %d\n", tmp);

239

240 if (tmp > 4) {

241 tmp = avio_rb16(s->pb); // unknown

242 av_dlog(s, "unknown %d\n", tmp);

243

244 tmp = avio_rb16(s->pb); // unknown

245 av_dlog(s, "unknown %d\n", tmp);

246

247 tmp = avio_rb32(s->pb);

248 av_dlog(s, "width %d\n", tmp);

249 tmp = avio_rb32(s->pb);

250 av_dlog(s, "height %d\n", tmp);

251

252 tmp = avio_rb32(s->pb);

253 av_dlog(s, "metadata len %d\n", tmp);

254 }

255 tmp = atom->size - 8 - (avio_tell(s->pb) - pos);

256 if (tmp < 0)

257 return -1;

258 ret = av_get_packet(s->pb, pkt, tmp);

259 if (ret < 0) {

260 av_log(s, AV_LOG_ERROR, "error reading video packet\n");

261 return -1;

262 }

263

264 pkt->stream_index = 0;

265 pkt->dts = dts;

266 if (st->avg_frame_rate.num)

267 pkt->duration = (uint64_t)st->time_base.den*

268 st->avg_frame_rate.den/st->avg_frame_rate.num;

269 av_dlog(s, "pkt dts %"PRId64" duration %d\n", pkt->dts, pkt->duration);

270

271 return 0;

272 }

273

274 static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)

275 {

276 AVStream *st = s->streams[1];

277 int av_unused tmp, tmp2;

278 int samples, size;

279 int64_t pos = avio_tell(s->pb);

280 unsigned dts;

281 int ret;

282

283 dts = avio_rb32(s->pb);

284

285 st->codec->sample_rate = avio_rb32(s->pb);

286 if (st->codec->sample_rate <= 0) {

287 av_log(s, AV_LOG_ERROR, "Bad sample rate\n");

288 return AVERROR_INVALIDDATA;

289 }

290

291 samples = avio_rb32(s->pb);

292

293 tmp = avio_rb32(s->pb);

294 av_dlog(s, "packet num %d\n", tmp);

295

296 tmp = avio_rb16(s->pb); // unknown

297 av_dlog(s, "unknown %d\n", tmp);

298

299 tmp = avio_r8(s->pb); // major version

300 tmp2 = avio_r8(s->pb); // minor version

301 av_dlog(s, "version %d.%d\n", tmp, tmp2);

302

303 tmp = avio_rb32(s->pb); // unknown

304 av_dlog(s, "unknown %d\n", tmp);

305

306 size = atom->size - 8 - (avio_tell(s->pb) - pos);

307 if (size < 0)

308 return -1;

309 ret = av_get_packet(s->pb, pkt, size);

310 if (ret < 0) {

311 av_log(s, AV_LOG_ERROR, "error reading audio packet\n");

312 return ret;

313 }

314

315 pkt->stream_index = 1;

316 pkt->dts = dts;

317 if (st->codec->sample_rate)

318 pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);

319 av_dlog(s, "pkt dts %"PRId64" duration %d samples %d sample rate %d\n",

320 pkt->dts, pkt->duration, samples, st->codec->sample_rate);

321

322 return 0;

323 }

324

325 static int r3d_read_packet(AVFormatContext *s, AVPacket *pkt)

326 {

327 Atom atom;

328 int err = 0;

329

330 while (!err) {

331 if (read_atom(s, &atom) < 0) {

332 err = -1;

333 break;

334 }

335 switch (atom.tag) {

336 case MKTAG('R','E','D','V'):

337 if (s->streams[0]->discard == AVDISCARD_ALL)

338 goto skip;

339 if (!(err = r3d_read_redv(s, pkt, &atom)))

340 return 0;

341 break;

342 case MKTAG('R','E','D','A'):

343 if (s->nb_streams < 2)

344 return -1;

345 if (s->streams[1]->discard == AVDISCARD_ALL)

346 goto skip;

347 if (!(err = r3d_read_reda(s, pkt, &atom)))

348 return 0;

349 break;

350 default:

351 skip:

352 avio_skip(s->pb, atom.size-8);

353 }

354 }

355 return err;

356 }

357

358 static int r3d_probe(AVProbeData *p)

359 {

360 if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))

361 return AVPROBE_SCORE_MAX;

362 return 0;

363 }

364

365 static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

366 {

367 AVStream *st = s->streams[0]; // video stream

368 R3DContext *r3d = s->priv_data;

369 int frame_num;

370

371 if (!st->avg_frame_rate.num)

372 return -1;

373

374 frame_num = av_rescale_q(sample_time, st->time_base,

375 av_inv_q(st->avg_frame_rate));

376 av_dlog(s, "seek frame num %d timestamp %"PRId64"\n",

377 frame_num, sample_time);

378

379 if (frame_num < r3d->video_offsets_count) {

380 if (avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET) < 0)

381 return -1;

382 } else {

383 av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);

384 return -1;

385 }

386

387 return 0;

388 }

389

390 static int r3d_close(AVFormatContext *s)

391 {

392 R3DContext *r3d = s->priv_data;

393

394 av_freep(&r3d->video_offsets);

395

396 return 0;

397 }

398

399 AVInputFormat ff_r3d_demuxer = {

400 .name = "r3d",

401 .long_name = NULL_IF_CONFIG_SMALL("REDCODE R3D"),

402 .priv_data_size = sizeof(R3DContext),

403 .read_probe = r3d_probe,

404 .read_header = r3d_read_header,

405 .read_packet = r3d_read_packet,

406 .read_close = r3d_close,

407 .read_seek = r3d_seek,

408 };

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