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 "libavutil/avassert.h"

32 #include "libavutil/channel_layout.h"

33 #include "libavutil/intreadwrite.h"

34 #include "libavutil/dict.h"

35 #include "libavcodec/bytestream.h"

36 #include "avformat.h"

37 #include "internal.h"

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

75 #define LEFT 2

76 #define RIGHT 4

77 #define STEREO 6

79 /**

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

81 * which contain additional information about video properties

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

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

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

85 * no extradata changing in this frame.

86 */

87 #define IFF_EXTRA_VIDEO_SIZE 41

89 typedef enum {

90 COMP_NONE,

91 COMP_FIB,

92 COMP_EXP

93 } svx8_compression_type;

95 typedef struct {

96 int64_t body_pos;

97 int64_t body_end;

98 uint32_t body_size;

99 svx8_compression_type svx8_compression;

100 unsigned maud_bits;

101 unsigned maud_compression;

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

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

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

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

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

107 unsigned masking; ///< masking method used

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

109 } IffDemuxContext;

110

111 /* Metadata string read */

112 static int get_metadata(AVFormatContext *s,

113 const char *const tag,

114 const unsigned data_size)

115 {

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

117

118 if (!buf)

119 return AVERROR(ENOMEM);

120

121 if (avio_read(s->pb, buf, data_size) < 0) {

122 av_free(buf);

123 return AVERROR(EIO);

124 }

125 buf[data_size] = 0;

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

127 return 0;

128 }

129

130 static int iff_probe(AVProbeData *p)

131 {

132 const uint8_t *d = p->buf;

133

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

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

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

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

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

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

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

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

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

143 AV_RL32(d+8) == ID_RGBN) )

144 return AVPROBE_SCORE_MAX;

145 return 0;

146 }

147

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

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

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

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

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

153

154 static int iff_read_header(AVFormatContext *s)

155 {

156 IffDemuxContext *iff = s->priv_data;

157 AVIOContext *pb = s->pb;

158 AVStream *st;

159 uint8_t *buf;

160 uint32_t chunk_id, data_size;

161 uint32_t screenmode = 0, num, den;

162 unsigned transparency = 0;

163 unsigned masking = 0; // no mask

164 uint8_t fmt[16];

165 int fmt_size;

166

167 st = avformat_new_stream(s, NULL);

168 if (!st)

169 return AVERROR(ENOMEM);

170

171 st->codec->channels = 1;

172 st->codec->channel_layout = AV_CH_LAYOUT_MONO;

173 avio_skip(pb, 8);

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

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

176 iff->bitmap_compression = -1;

177 iff->svx8_compression = -1;

178 iff->maud_bits = -1;

179 iff->maud_compression = -1;

180

181 while(!url_feof(pb)) {

182 uint64_t orig_pos;

183 int res;

184 const char *metadata_tag = NULL;

185 chunk_id = avio_rl32(pb);

186 data_size = avio_rb32(pb);

187 orig_pos = avio_tell(pb);

188

189 switch(chunk_id) {

190 case ID_VHDR:

191 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

192

193 if (data_size < 14)

194 return AVERROR_INVALIDDATA;

195 avio_skip(pb, 12);

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

197 if (data_size >= 16) {

198 avio_skip(pb, 1);

199 iff->svx8_compression = avio_r8(pb);

200 }

201 break;

202

203 case ID_MHDR:

204 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

205

206 if (data_size < 32)

207 return AVERROR_INVALIDDATA;

208 avio_skip(pb, 4);

209 iff->maud_bits = avio_rb16(pb);

210 avio_skip(pb, 2);

211 num = avio_rb32(pb);

212 den = avio_rb16(pb);

213 if (!den)

214 return AVERROR_INVALIDDATA;

215 avio_skip(pb, 2);

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

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

218 iff->maud_compression = avio_rb16(pb);

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

220 st->codec->channel_layout = AV_CH_LAYOUT_MONO;

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

222 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;

223 break;

224

225 case ID_ABIT:

226 case ID_BODY:

227 case ID_DBOD:

228 case ID_MDAT:

229 iff->body_pos = avio_tell(pb);

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

231 iff->body_size = data_size;

232 break;

233

234 case ID_CHAN:

235 if (data_size < 4)

236 return AVERROR_INVALIDDATA;

237 if (avio_rb32(pb) < 6) {

238 st->codec->channels = 1;

239 st->codec->channel_layout = AV_CH_LAYOUT_MONO;

240 } else {

241 st->codec->channels = 2;

242 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;

243 }

244 break;

245

246 case ID_CAMG:

247 if (data_size < 4)

248 return AVERROR_INVALIDDATA;

249 screenmode = avio_rb32(pb);

250 break;

251

252 case ID_CMAP:

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

254 av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %d\n",

255 data_size);

256 return AVERROR_INVALIDDATA;

257 }

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

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

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

261 return AVERROR(ENOMEM);

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

263 return AVERROR(EIO);

264 break;

265

266 case ID_BMHD:

267 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

268 if (data_size <= 8)

269 return AVERROR_INVALIDDATA;

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

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

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

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

274 if (data_size >= 10)

275 masking = avio_r8(pb);

276 if (data_size >= 11)

277 iff->bitmap_compression = avio_r8(pb);

278 if (data_size >= 14) {

279 avio_skip(pb, 1); // padding

280 transparency = avio_rb16(pb);

281 }

282 if (data_size >= 16) {

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

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

285 }

286 break;

287

288 case ID_DPEL:

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

290 return AVERROR_INVALIDDATA;

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

292 return fmt_size;

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

294 st->codec->pix_fmt = AV_PIX_FMT_RGB24;

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

296 st->codec->pix_fmt = AV_PIX_FMT_RGBA;

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

298 st->codec->pix_fmt = AV_PIX_FMT_BGRA;

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

300 st->codec->pix_fmt = AV_PIX_FMT_ARGB;

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

302 st->codec->pix_fmt = AV_PIX_FMT_ABGR;

303 else {

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

305 return AVERROR_PATCHWELCOME;

306 }

307 break;

308

309 case ID_DGBL:

310 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

311 if (data_size < 8)

312 return AVERROR_INVALIDDATA;

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

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

315 iff->bitmap_compression = avio_rb16(pb);

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

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

318 st->codec->bits_per_coded_sample = 24;

319 break;

320

321 case ID_DLOC:

322 if (data_size < 4)

323 return AVERROR_INVALIDDATA;

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

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

326 break;

327

328 case ID_TVDC:

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

330 return AVERROR_INVALIDDATA;

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

332 if (res < 0)

333 return res;

334 break;

335

336 case ID_ANNO:

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

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

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

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

341 }

342

343 if (metadata_tag) {

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

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

346 return res;

347 }

348 }

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

350 }

351

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

353

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

355 case AVMEDIA_TYPE_AUDIO:

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

357

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

359 st->codec->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;

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

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

362 st->codec->codec_id = AV_CODEC_ID_PCM_U8;

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

364 st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;

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

366 st->codec->codec_id = AV_CODEC_ID_PCM_ALAW;

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

368 st->codec->codec_id = AV_CODEC_ID_PCM_MULAW;

369 } else {

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

371 return AVERROR_PATCHWELCOME;

372 }

373

374 st->codec->bits_per_coded_sample =

375 av_get_bits_per_sample(st->codec->codec_id);

376

377 st->codec->block_align =

378 st->codec->bits_per_coded_sample * st->codec->channels / 8;

379 } else {

380 switch (iff->svx8_compression) {

381 case COMP_NONE:

382 st->codec->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;

383 break;

384 case COMP_FIB:

385 st->codec->codec_id = AV_CODEC_ID_8SVX_FIB;

386 break;

387 case COMP_EXP:

388 st->codec->codec_id = AV_CODEC_ID_8SVX_EXP;

389 break;

390 default:

391 av_log(s, AV_LOG_ERROR,

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

393 return -1;

394 }

395 }

396

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

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

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

400 break;

401

402 case AVMEDIA_TYPE_VIDEO:

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

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

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

406 st->codec->bits_per_coded_sample = 24;

407 }

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

409 iff->masking = masking;

410 iff->transparency = transparency;

411

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

413 st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;

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

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

416 return AVERROR(ENOMEM);

417 }

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

419 buf = st->codec->extradata;

420 bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);

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

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

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

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

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

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

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

428 st->codec->codec_id = AV_CODEC_ID_IFF_ILBM;

429 break;

430 default:

431 return -1;

432 }

433

434 return 0;

435 }

436

437 static int iff_read_packet(AVFormatContext *s,

438 AVPacket *pkt)

439 {

440 IffDemuxContext *iff = s->priv_data;

441 AVIOContext *pb = s->pb;

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

443 int ret;

444 int64_t pos = avio_tell(pb);

445

446 if (pos >= iff->body_end)

447 return AVERROR_EOF;

448

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

450 if (st->codec->codec_tag == ID_MAUD) {

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

452 } else {

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

454 }

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

456 uint8_t *buf;

457

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

459 return AVERROR(ENOMEM);

460 }

461

462 buf = pkt->data;

463 bytestream_put_be16(&buf, 2);

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

465 } else {

466 av_assert0(0);

467 }

468

469 if (pos == iff->body_pos)

470 pkt->flags |= AV_PKT_FLAG_KEY;

471 if (ret < 0)

472 return ret;

473 pkt->stream_index = 0;

474 return ret;

475 }

476

477 AVInputFormat ff_iff_demuxer = {

478 .name = "iff",

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

480 .priv_data_size = sizeof(IffDemuxContext),

481 .read_probe = iff_probe,

482 .read_header = iff_read_header,

483 .read_packet = iff_read_packet,

484 .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,

485 };

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