FFmpeg: libavformat/iff.c Source File

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libavformat

iff.c

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1 /*

5 *

6 * This file is part of FFmpeg.

7 *

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

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

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

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

12 *

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

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

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

16 * Lesser General Public License for more details.

17 *

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

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

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

21 */

23 /**

24 * @file

25 * IFF file demuxer

26 * by Jaikrishnan Menon

27 * for more information on the .iff file format, visit:

28 * http://wiki.multimedia.cx/index.php?title=IFF

29 */

31 #include <inttypes.h>

33 #include "libavutil/avassert.h"

34 #include "libavutil/channel_layout.h"

35 #include "libavutil/intreadwrite.h"

36 #include "libavutil/dict.h"

37 #include "libavcodec/bytestream.h"

38 #include "avformat.h"

39 #include "id3v2.h"

40 #include "internal.h"

42 #define ID_8SVX MKTAG('8','S','V','X')

43 #define ID_16SV MKTAG('1','6','S','V')

44 #define ID_MAUD MKTAG('M','A','U','D')

45 #define ID_MHDR MKTAG('M','H','D','R')

46 #define ID_MDAT MKTAG('M','D','A','T')

47 #define ID_VHDR MKTAG('V','H','D','R')

48 #define ID_ATAK MKTAG('A','T','A','K')

49 #define ID_RLSE MKTAG('R','L','S','E')

50 #define ID_CHAN MKTAG('C','H','A','N')

51 #define ID_PBM MKTAG('P','B','M',' ')

52 #define ID_ILBM MKTAG('I','L','B','M')

53 #define ID_BMHD MKTAG('B','M','H','D')

54 #define ID_DGBL MKTAG('D','G','B','L')

55 #define ID_CAMG MKTAG('C','A','M','G')

56 #define ID_CMAP MKTAG('C','M','A','P')

57 #define ID_ACBM MKTAG('A','C','B','M')

58 #define ID_DEEP MKTAG('D','E','E','P')

59 #define ID_RGB8 MKTAG('R','G','B','8')

60 #define ID_RGBN MKTAG('R','G','B','N')

61 #define ID_DSD MKTAG('D','S','D',' ')

62 #define ID_ANIM MKTAG('A','N','I','M')

64 #define ID_FORM MKTAG('F','O','R','M')

65 #define ID_FRM8 MKTAG('F','R','M','8')

66 #define ID_ANNO MKTAG('A','N','N','O')

67 #define ID_AUTH MKTAG('A','U','T','H')

68 #define ID_CHRS MKTAG('C','H','R','S')

69 #define ID_COPYRIGHT MKTAG('(','c',')',' ')

70 #define ID_CSET MKTAG('C','S','E','T')

71 #define ID_FVER MKTAG('F','V','E','R')

72 #define ID_NAME MKTAG('N','A','M','E')

73 #define ID_TEXT MKTAG('T','E','X','T')

74 #define ID_ABIT MKTAG('A','B','I','T')

75 #define ID_BODY MKTAG('B','O','D','Y')

76 #define ID_DBOD MKTAG('D','B','O','D')

77 #define ID_DPEL MKTAG('D','P','E','L')

78 #define ID_DLOC MKTAG('D','L','O','C')

79 #define ID_TVDC MKTAG('T','V','D','C')

81 #define LEFT 2

82 #define RIGHT 4

83 #define STEREO 6

85 /**

86 * This number of bytes if added at the beginning of each AVPacket

87 * which contain additional information about video properties

88 * which has to be shared between demuxer and decoder.

89 * This number may change between frames, e.g. the demuxer might

90 * set it to smallest possible size of 2 to indicate that there's

91 * no extradata changing in this frame.

92 */

93 #define IFF_EXTRA_VIDEO_SIZE 41

95 typedef enum {

96 COMP_NONE,

97 COMP_FIB,

98 COMP_EXP

99 } svx8_compression_type;

100

101 typedef struct IffDemuxContext {

102 int is_64bit; ///< chunk size is 64-bit

103 int64_t body_pos;

104 int64_t body_end;

105 uint32_t body_size;

106 svx8_compression_type svx8_compression;

107 unsigned maud_bits;

108 unsigned maud_compression;

109 unsigned bitmap_compression; ///< delta compression method used

110 unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)

111 unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)

112 unsigned flags; ///< 1 for EHB, 0 is no extra half darkening

113 unsigned transparency; ///< transparency color index in palette

114 unsigned masking; ///< masking method used

115 uint8_t tvdc[32]; ///< TVDC lookup table

116 } IffDemuxContext;

117

118 /* Metadata string read */

119 static int get_metadata(AVFormatContext *s,

120 const char *const tag,

121 const unsigned data_size)

122 {

123 uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);

124

125 if (!buf)

126 return AVERROR(ENOMEM);

127

128 if (avio_read(s->pb, buf, data_size) != data_size) {

129 av_free(buf);

130 return AVERROR(EIO);

131 }

132 buf[data_size] = 0;

133 av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);

134 return 0;

135 }

136

137 static int iff_probe(AVProbeData *p)

138 {

139 const uint8_t *d = p->buf;

140

141 if ( (AV_RL32(d) == ID_FORM &&

142 (AV_RL32(d+8) == ID_8SVX ||

143 AV_RL32(d+8) == ID_16SV ||

144 AV_RL32(d+8) == ID_MAUD ||

145 AV_RL32(d+8) == ID_PBM ||

146 AV_RL32(d+8) == ID_ACBM ||

147 AV_RL32(d+8) == ID_DEEP ||

148 AV_RL32(d+8) == ID_ILBM ||

149 AV_RL32(d+8) == ID_RGB8 ||

150 AV_RL32(d+8) == ID_RGB8 ||

151 AV_RL32(d+8) == ID_ANIM ||

152 AV_RL32(d+8) == ID_RGBN)) ||

153 (AV_RL32(d) == ID_FRM8 && AV_RL32(d+12) == ID_DSD))

154 return AVPROBE_SCORE_MAX;

155 return 0;

156 }

157

158 static const AVCodecTag dsd_codec_tags[] = {

159 { AV_CODEC_ID_DSD_MSBF, ID_DSD },

160 { AV_CODEC_ID_NONE, 0 },

161 };

162

163

164 #define DSD_SLFT MKTAG('S','L','F','T')

165 #define DSD_SRGT MKTAG('S','R','G','T')

166 #define DSD_MLFT MKTAG('M','L','F','T')

167 #define DSD_MRGT MKTAG('M','R','G','T')

168 #define DSD_C MKTAG('C',' ',' ',' ')

169 #define DSD_LS MKTAG('L','S',' ',' ')

170 #define DSD_RS MKTAG('R','S',' ',' ')

171 #define DSD_LFE MKTAG('L','F','E',' ')

172

173 static const uint32_t dsd_stereo[] = { DSD_SLFT, DSD_SRGT };

174 static const uint32_t dsd_5point0[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LS, DSD_RS };

175 static const uint32_t dsd_5point1[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LFE, DSD_LS, DSD_RS };

176

177 typedef struct {

178 uint64_t layout;

179 const uint32_t * dsd_layout;

180 } DSDLayoutDesc;

181

182 static const DSDLayoutDesc dsd_channel_layout[] = {

183 { AV_CH_LAYOUT_STEREO, dsd_stereo },

184 { AV_CH_LAYOUT_5POINT0, dsd_5point0 },

185 { AV_CH_LAYOUT_5POINT1, dsd_5point1 },

186 };

187

188 static const uint64_t dsd_loudspeaker_config[] = {

189 AV_CH_LAYOUT_STEREO,

190 0, 0,

191 AV_CH_LAYOUT_5POINT0, AV_CH_LAYOUT_5POINT1,

192 };

193

194 static const char * dsd_source_comment[] = {

195 "dsd_source_comment",

196 "analogue_source_comment",

197 "pcm_source_comment",

198 };

199

200 static const char * dsd_history_comment[] = {

201 "general_remark",

202 "operator_name",

203 "creating_machine",

204 "timezone",

205 "file_revision"

206 };

207

208 static int parse_dsd_diin(AVFormatContext *s, AVStream *st, uint64_t eof)

209 {

210 AVIOContext *pb = s->pb;

211

212 while (avio_tell(pb) + 12 <= eof) {

213 uint32_t tag = avio_rl32(pb);

214 uint64_t size = avio_rb64(pb);

215 uint64_t orig_pos = avio_tell(pb);

216 const char * metadata_tag = NULL;

217

218 switch(tag) {

219 case MKTAG('D','I','A','R'): metadata_tag = "artist"; break;

220 case MKTAG('D','I','T','I'): metadata_tag = "title"; break;

221 }

222

223 if (metadata_tag && size > 4) {

224 unsigned int tag_size = avio_rb32(pb);

225 int ret = get_metadata(s, metadata_tag, FFMIN(tag_size, size - 4));

226 if (ret < 0) {

227 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);

228 return ret;

229 }

230 }

231

232 avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));

233 }

234

235 return 0;

236 }

237

238 static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)

239 {

240 AVIOContext *pb = s->pb;

241 char abss[24];

242 int hour, min, sec, i, ret, config;

243 int dsd_layout[6];

244 ID3v2ExtraMeta *id3v2_extra_meta;

245

246 while (avio_tell(pb) + 12 <= eof) {

247 uint32_t tag = avio_rl32(pb);

248 uint64_t size = avio_rb64(pb);

249 uint64_t orig_pos = avio_tell(pb);

250

251 switch(tag) {

252 case MKTAG('A','B','S','S'):

253 if (size < 8)

254 return AVERROR_INVALIDDATA;

255 hour = avio_rb16(pb);

256 min = avio_r8(pb);

257 sec = avio_r8(pb);

258 snprintf(abss, sizeof(abss), "%02dh:%02dm:%02ds:%d", hour, min, sec, avio_rb32(pb));

259 av_dict_set(&st->metadata, "absolute_start_time", abss, 0);

260 break;

261

262 case MKTAG('C','H','N','L'):

263 if (size < 2)

264 return AVERROR_INVALIDDATA;

265 st->codec->channels = avio_rb16(pb);

266 if (size < 2 + st->codec->channels * 4)

267 return AVERROR_INVALIDDATA;

268 st->codec->channel_layout = 0;

269 if (st->codec->channels > FF_ARRAY_ELEMS(dsd_layout)) {

270 avpriv_request_sample(s, "channel layout");

271 break;

272 }

273 for (i = 0; i < st->codec->channels; i++)

274 dsd_layout[i] = avio_rl32(pb);

275 for (i = 0; i < FF_ARRAY_ELEMS(dsd_channel_layout); i++) {

276 const DSDLayoutDesc * d = &dsd_channel_layout[i];

277 if (av_get_channel_layout_nb_channels(d->layout) == st->codec->channels &&

278 !memcmp(d->dsd_layout, dsd_layout, st->codec->channels * sizeof(uint32_t))) {

279 st->codec->channel_layout = d->layout;

280 break;

281 }

282 }

283 break;

284

285 case MKTAG('C','M','P','R'):

286 if (size < 4)

287 return AVERROR_INVALIDDATA;

288 tag = avio_rl32(pb);

289 st->codec->codec_id = ff_codec_get_id(dsd_codec_tags, tag);

290 if (!st->codec->codec_id) {

291 av_log(s, AV_LOG_ERROR, "'%c%c%c%c' compression is not supported\n",

292 tag&0xFF, (tag>>8)&0xFF, (tag>>16)&0xFF, (tag>>24)&0xFF);

293 return AVERROR_PATCHWELCOME;

294 }

295 break;

296

297 case MKTAG('F','S',' ',' '):

298 if (size < 4)

299 return AVERROR_INVALIDDATA;

300 st->codec->sample_rate = avio_rb32(pb) / 8;

301 break;

302

303 case MKTAG('I','D','3',' '):

304 id3v2_extra_meta = NULL;

305 ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);

306 if (id3v2_extra_meta) {

307 if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {

308 ff_id3v2_free_extra_meta(&id3v2_extra_meta);

309 return ret;

310 }

311 ff_id3v2_free_extra_meta(&id3v2_extra_meta);

312 }

313

314 if (size < avio_tell(pb) - orig_pos) {

315 av_log(s, AV_LOG_ERROR, "id3 exceeds chunk size\n");

316 return AVERROR_INVALIDDATA;

317 }

318 break;

319

320 case MKTAG('L','S','C','O'):

321 if (size < 2)

322 return AVERROR_INVALIDDATA;

323 config = avio_rb16(pb);

324 if (config != 0xFFFF) {

325 if (config < FF_ARRAY_ELEMS(dsd_loudspeaker_config))

326 st->codec->channel_layout = dsd_loudspeaker_config[config];

327 if (!st->codec->channel_layout)

328 avpriv_request_sample(s, "loudspeaker configuration %d", config);

329 }

330 break;

331 }

332

333 avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));

334 }

335

336 return 0;

337 }

338

339 static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};

340 static const uint8_t deep_rgba[] = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};

341 static const uint8_t deep_bgra[] = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};

342 static const uint8_t deep_argb[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};

343 static const uint8_t deep_abgr[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};

344

345 static int iff_read_header(AVFormatContext *s)

346 {

347 IffDemuxContext *iff = s->priv_data;

348 AVIOContext *pb = s->pb;

349 AVStream *st;

350 uint8_t *buf;

351 uint32_t chunk_id;

352 uint64_t data_size;

353 uint32_t screenmode = 0, num, den;

354 unsigned transparency = 0;

355 unsigned masking = 0; // no mask

356 uint8_t fmt[16];

357 int fmt_size;

358

359 st = avformat_new_stream(s, NULL);

360 if (!st)

361 return AVERROR(ENOMEM);

362

363 st->codec->channels = 1;

364 st->codec->channel_layout = AV_CH_LAYOUT_MONO;

365 iff->is_64bit = avio_rl32(pb) == ID_FRM8;

366 avio_skip(pb, iff->is_64bit ? 8 : 4);

367 // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content

368 st->codec->codec_tag = avio_rl32(pb);

369 if (st->codec->codec_tag == ID_ANIM) {

370 avio_skip(pb, 8);

371 st->codec->codec_tag = avio_rl32(pb);

372 }

373 iff->bitmap_compression = -1;

374 iff->svx8_compression = -1;

375 iff->maud_bits = -1;

376 iff->maud_compression = -1;

377

378 while(!avio_feof(pb)) {

379 uint64_t orig_pos;

380 int res;

381 const char *metadata_tag = NULL;

382 int version, nb_comments, i;

383 chunk_id = avio_rl32(pb);

384 data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);

385 orig_pos = avio_tell(pb);

386

387 switch(chunk_id) {

388 case ID_VHDR:

389 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

390

391 if (data_size < 14)

392 return AVERROR_INVALIDDATA;

393 avio_skip(pb, 12);

394 st->codec->sample_rate = avio_rb16(pb);

395 if (data_size >= 16) {

396 avio_skip(pb, 1);

397 iff->svx8_compression = avio_r8(pb);

398 }

399 break;

400

401 case ID_MHDR:

402 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

403

404 if (data_size < 32)

405 return AVERROR_INVALIDDATA;

406 avio_skip(pb, 4);

407 iff->maud_bits = avio_rb16(pb);

408 avio_skip(pb, 2);

409 num = avio_rb32(pb);

410 den = avio_rb16(pb);

411 if (!den)

412 return AVERROR_INVALIDDATA;

413 avio_skip(pb, 2);

414 st->codec->sample_rate = num / den;

415 st->codec->channels = avio_rb16(pb);

416 iff->maud_compression = avio_rb16(pb);

417 if (st->codec->channels == 1)

418 st->codec->channel_layout = AV_CH_LAYOUT_MONO;

419 else if (st->codec->channels == 2)

420 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;

421 break;

422

423 case ID_ABIT:

424 case ID_BODY:

425 case ID_DBOD:

426 case ID_DSD:

427 case ID_MDAT:

428 iff->body_pos = avio_tell(pb);

429 iff->body_end = iff->body_pos + data_size;

430 iff->body_size = data_size;

431 break;

432

433 case ID_CHAN:

434 if (data_size < 4)

435 return AVERROR_INVALIDDATA;

436 if (avio_rb32(pb) < 6) {

437 st->codec->channels = 1;

438 st->codec->channel_layout = AV_CH_LAYOUT_MONO;

439 } else {

440 st->codec->channels = 2;

441 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;

442 }

443 break;

444

445 case ID_CAMG:

446 if (data_size < 4)

447 return AVERROR_INVALIDDATA;

448 screenmode = avio_rb32(pb);

449 break;

450

451 case ID_CMAP:

452 if (data_size < 3 || data_size > 768 || data_size % 3) {

453 av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %"PRIu64"\n",

454 data_size);

455 return AVERROR_INVALIDDATA;

456 }

457 st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;

458 st->codec->extradata = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);

459 if (!st->codec->extradata)

460 return AVERROR(ENOMEM);

461 if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)

462 return AVERROR(EIO);

463 break;

464

465 case ID_BMHD:

466 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

467 if (data_size <= 8)

468 return AVERROR_INVALIDDATA;

469 st->codec->width = avio_rb16(pb);

470 st->codec->height = avio_rb16(pb);

471 avio_skip(pb, 4); // x, y offset

472 st->codec->bits_per_coded_sample = avio_r8(pb);

473 if (data_size >= 10)

474 masking = avio_r8(pb);

475 if (data_size >= 11)

476 iff->bitmap_compression = avio_r8(pb);

477 if (data_size >= 14) {

478 avio_skip(pb, 1); // padding

479 transparency = avio_rb16(pb);

480 }

481 if (data_size >= 16) {

482 st->sample_aspect_ratio.num = avio_r8(pb);

483 st->sample_aspect_ratio.den = avio_r8(pb);

484 }

485 break;

486

487 case ID_DPEL:

488 if (data_size < 4 || (data_size & 3))

489 return AVERROR_INVALIDDATA;

490 if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)

491 return fmt_size;

492 if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))

493 st->codec->pix_fmt = AV_PIX_FMT_RGB24;

494 else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))

495 st->codec->pix_fmt = AV_PIX_FMT_RGBA;

496 else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))

497 st->codec->pix_fmt = AV_PIX_FMT_BGRA;

498 else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))

499 st->codec->pix_fmt = AV_PIX_FMT_ARGB;

500 else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))

501 st->codec->pix_fmt = AV_PIX_FMT_ABGR;

502 else {

503 avpriv_request_sample(s, "color format %.16s", fmt);

504 return AVERROR_PATCHWELCOME;

505 }

506 break;

507

508 case ID_DGBL:

509 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

510 if (data_size < 8)

511 return AVERROR_INVALIDDATA;

512 st->codec->width = avio_rb16(pb);

513 st->codec->height = avio_rb16(pb);

514 iff->bitmap_compression = avio_rb16(pb);

515 st->sample_aspect_ratio.num = avio_r8(pb);

516 st->sample_aspect_ratio.den = avio_r8(pb);

517 st->codec->bits_per_coded_sample = 24;

518 break;

519

520 case ID_DLOC:

521 if (data_size < 4)

522 return AVERROR_INVALIDDATA;

523 st->codec->width = avio_rb16(pb);

524 st->codec->height = avio_rb16(pb);

525 break;

526

527 case ID_TVDC:

528 if (data_size < sizeof(iff->tvdc))

529 return AVERROR_INVALIDDATA;

530 res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));

531 if (res < 0)

532 return res;

533 break;

534

535 case ID_ANNO:

536 case ID_TEXT: metadata_tag = "comment"; break;

537 case ID_AUTH: metadata_tag = "artist"; break;

538 case ID_COPYRIGHT: metadata_tag = "copyright"; break;

539 case ID_NAME: metadata_tag = "title"; break;

540

541 /* DSD tags */

542

543 case MKTAG('F','V','E','R'):

544 if (data_size < 4)

545 return AVERROR_INVALIDDATA;

546 version = avio_rb32(pb);

547 av_log(s, AV_LOG_DEBUG, "DSIFF v%d.%d.%d.%d\n",version >> 24, (version >> 16) & 0xFF, (version >> 8) & 0xFF, version & 0xFF);

548 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

549 break;

550

551 case MKTAG('D','I','I','N'):

552 res = parse_dsd_diin(s, st, orig_pos + data_size);

553 if (res < 0)

554 return res;

555 break;

556

557 case MKTAG('P','R','O','P'):

558 if (data_size < 4)

559 return AVERROR_INVALIDDATA;

560 if (avio_rl32(pb) != MKTAG('S','N','D',' ')) {

561 avpriv_request_sample(s, "unknown property type");

562 break;

563 }

564 res = parse_dsd_prop(s, st, orig_pos + data_size);

565 if (res < 0)

566 return res;

567 break;

568

569 case MKTAG('C','O','M','T'):

570 if (data_size < 2)

571 return AVERROR_INVALIDDATA;

572 nb_comments = avio_rb16(pb);

573 for (i = 0; i < nb_comments; i++) {

574 int year, mon, day, hour, min, type, ref;

575 char tmp[24];

576 const char *tag;

577 int metadata_size;

578

579 year = avio_rb16(pb);

580 mon = avio_r8(pb);

581 day = avio_r8(pb);

582 hour = avio_r8(pb);

583 min = avio_r8(pb);

584 snprintf(tmp, sizeof(tmp), "%04d-%02d-%02d %02d:%02d", year, mon, day, hour, min);

585 av_dict_set(&st->metadata, "comment_time", tmp, 0);

586

587 type = avio_rb16(pb);

588 ref = avio_rb16(pb);

589 switch (type) {

590 case 1:

591 if (!i)

592 tag = "channel_comment";

593 else {

594 snprintf(tmp, sizeof(tmp), "channel%d_comment", ref);

595 tag = tmp;

596 }

597 break;

598 case 2:

599 tag = ref < FF_ARRAY_ELEMS(dsd_source_comment) ? dsd_source_comment[ref] : "source_comment";

600 break;

601 case 3:

602 tag = ref < FF_ARRAY_ELEMS(dsd_history_comment) ? dsd_history_comment[ref] : "file_history";

603 break;

604 default:

605 tag = "comment";

606 }

607

608 metadata_size = avio_rb32(pb);

609 if ((res = get_metadata(s, tag, metadata_size)) < 0) {

610 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", tag);

611 return res;

612 }

613

614 if (metadata_size & 1)

615 avio_skip(pb, 1);

616 }

617 break;

618 }

619

620 if (metadata_tag) {

621 if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {

622 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);

623 return res;

624 }

625 }

626 avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));

627 }

628

629 avio_seek(pb, iff->body_pos, SEEK_SET);

630

631 switch(st->codec->codec_type) {

632 case AVMEDIA_TYPE_AUDIO:

633 avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);

634

635 if (st->codec->codec_tag == ID_16SV)

636 st->codec->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;

637 else if (st->codec->codec_tag == ID_MAUD) {

638 if (iff->maud_bits == 8 && !iff->maud_compression) {

639 st->codec->codec_id = AV_CODEC_ID_PCM_U8;

640 } else if (iff->maud_bits == 16 && !iff->maud_compression) {

641 st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;

642 } else if (iff->maud_bits == 8 && iff->maud_compression == 2) {

643 st->codec->codec_id = AV_CODEC_ID_PCM_ALAW;

644 } else if (iff->maud_bits == 8 && iff->maud_compression == 3) {

645 st->codec->codec_id = AV_CODEC_ID_PCM_MULAW;

646 } else {

647 avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);

648 return AVERROR_PATCHWELCOME;

649 }

650 } else if (st->codec->codec_tag != ID_DSD) {

651 switch (iff->svx8_compression) {

652 case COMP_NONE:

653 st->codec->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;

654 break;

655 case COMP_FIB:

656 st->codec->codec_id = AV_CODEC_ID_8SVX_FIB;

657 break;

658 case COMP_EXP:

659 st->codec->codec_id = AV_CODEC_ID_8SVX_EXP;

660 break;

661 default:

662 av_log(s, AV_LOG_ERROR,

663 "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);

664 return -1;

665 }

666 }

667

668 st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);

669 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;

670 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;

671 break;

672

673 case AVMEDIA_TYPE_VIDEO:

674 iff->bpp = st->codec->bits_per_coded_sample;

675 if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {

676 iff->ham = iff->bpp > 6 ? 6 : 4;

677 st->codec->bits_per_coded_sample = 24;

678 }

679 iff->flags = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;

680 iff->masking = masking;

681 iff->transparency = transparency;

682

683 if (!st->codec->extradata) {

684 st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;

685 st->codec->extradata = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);

686 if (!st->codec->extradata)

687 return AVERROR(ENOMEM);

688 }

689 av_assert0(st->codec->extradata_size >= IFF_EXTRA_VIDEO_SIZE);

690 buf = st->codec->extradata;

691 bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);

692 bytestream_put_byte(&buf, iff->bitmap_compression);

693 bytestream_put_byte(&buf, iff->bpp);

694 bytestream_put_byte(&buf, iff->ham);

695 bytestream_put_byte(&buf, iff->flags);

696 bytestream_put_be16(&buf, iff->transparency);

697 bytestream_put_byte(&buf, iff->masking);

698 bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));

699 st->codec->codec_id = AV_CODEC_ID_IFF_ILBM;

700 break;

701 default:

702 return -1;

703 }

704

705 return 0;

706 }

707

708 static int iff_read_packet(AVFormatContext *s,

709 AVPacket *pkt)

710 {

711 IffDemuxContext *iff = s->priv_data;

712 AVIOContext *pb = s->pb;

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

714 int ret;

715 int64_t pos = avio_tell(pb);

716

717 if (pos >= iff->body_end)

718 return AVERROR_EOF;

719

720 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

721 if (st->codec->codec_tag == ID_DSD || st->codec->codec_tag == ID_MAUD) {

722 ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * st->codec->block_align));

723 } else {

724 ret = av_get_packet(pb, pkt, iff->body_size);

725 }

726 } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

727 uint8_t *buf;

728

729 if (av_new_packet(pkt, iff->body_size + 2) < 0) {

730 return AVERROR(ENOMEM);

731 }

732

733 buf = pkt->data;

734 bytestream_put_be16(&buf, 2);

735 ret = avio_read(pb, buf, iff->body_size);

736 if (ret<0) {

737 av_free_packet(pkt);

738 } else if (ret < iff->body_size)

739 av_shrink_packet(pkt, ret + 2);

740 } else {

741 av_assert0(0);

742 }

743

744 if (pos == iff->body_pos)

745 pkt->flags |= AV_PKT_FLAG_KEY;

746 if (ret < 0)

747 return ret;

748 pkt->stream_index = 0;

749 return ret;

750 }

751

752 AVInputFormat ff_iff_demuxer = {

753 .name = "iff",

754 .long_name = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),

755 .priv_data_size = sizeof(IffDemuxContext),

756 .read_probe = iff_probe,

757 .read_header = iff_read_header,

758 .read_packet = iff_read_packet,

759 .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,

760 };

Generated on Sun Mar 8 2015 02:34:53 for FFmpeg by doxygen 1.8.2