FFmpeg: libavformat/rmdec.c Source File

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libavformat

rmdec.c

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1 /*

2 * "Real" compatible 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/avassert.h"

23 #include "libavutil/avstring.h"

24 #include "libavutil/channel_layout.h"

25 #include "libavutil/internal.h"

26 #include "libavutil/intreadwrite.h"

27 #include "libavutil/dict.h"

28 #include "avformat.h"

29 #include "avio_internal.h"

30 #include "internal.h"

31 #include "rmsipr.h"

32 #include "rm.h"

34 #define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r') ///< interleaving for Cooker/ATRAC

35 #define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0') ///< no interleaving needed

36 #define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4') ///< interleaving for 28.8

37 #define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r') ///< interleaving for Sipro

38 #define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f') ///< VBR case for AAC

39 #define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's') ///< VBR case for AAC

41 struct RMStream {

42 AVPacket pkt; ///< place to store merged video frame / reordered audio data

43 int videobufsize; ///< current assembled frame size

44 int videobufpos; ///< position for the next slice in the video buffer

45 int curpic_num; ///< picture number of current frame

46 int cur_slice, slices;

47 int64_t pktpos; ///< first slice position in file

48 /// Audio descrambling matrix parameters

49 int64_t audiotimestamp; ///< Audio packet timestamp

50 int sub_packet_cnt; // Subpacket counter, used while reading

51 int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container

52 int audio_framesize; /// Audio frame size from container

53 int sub_packet_lengths[16]; /// Length of each subpacket

54 int32_t deint_id; ///< deinterleaver used in audio stream

55 };

57 typedef struct {

58 int nb_packets;

59 int old_format;

60 int current_stream;

61 int remaining_len;

62 int audio_stream_num; ///< Stream number for audio packets

63 int audio_pkt_cnt; ///< Output packet counter

64 } RMDemuxContext;

66 static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)

67 {

68 int i;

69 char *q, r;

71 q = buf;

72 for(i=0;i<len;i++) {

73 r = avio_r8(pb);

74 if (i < buf_size - 1)

75 *q++ = r;

76 }

77 if (buf_size > 0) *q = '0円';

78 }

80 static void get_str8(AVIOContext *pb, char *buf, int buf_size)

81 {

82 get_strl(pb, buf, buf_size, avio_r8(pb));

83 }

85 static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)

86 {

87 if (size >= 1<<24)

88 return -1;

89 if (ff_alloc_extradata(avctx, size))

90 return AVERROR(ENOMEM);

91 avctx->extradata_size = avio_read(pb, avctx->extradata, size);

92 if (avctx->extradata_size != size)

93 return AVERROR(EIO);

94 return 0;

95 }

97 static void rm_read_metadata(AVFormatContext *s, AVIOContext *pb, int wide)

98 {

99 char buf[1024];

100 int i;

101

102 for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {

103 int len = wide ? avio_rb16(pb) : avio_r8(pb);

104 get_strl(pb, buf, sizeof(buf), len);

105 av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);

106 }

107 }

108

109 RMStream *ff_rm_alloc_rmstream (void)

110 {

111 RMStream *rms = av_mallocz(sizeof(RMStream));

112 rms->curpic_num = -1;

113 return rms;

114 }

115

116 void ff_rm_free_rmstream (RMStream *rms)

117 {

118 av_free_packet(&rms->pkt);

119 }

120

121 static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,

122 AVStream *st, RMStream *ast, int read_all)

123 {

124 char buf[256];

125 uint32_t version;

126 int ret;

127

128 /* ra type header */

129 version = avio_rb16(pb); /* version */

130 if (version == 3) {

131 unsigned bytes_per_minute;

132 int header_size = avio_rb16(pb);

133 int64_t startpos = avio_tell(pb);

134 avio_skip(pb, 8);

135 bytes_per_minute = avio_rb16(pb);

136 avio_skip(pb, 4);

137 rm_read_metadata(s, pb, 0);

138 if ((startpos + header_size) >= avio_tell(pb) + 2) {

139 // fourcc (should always be "lpcJ")

140 avio_r8(pb);

141 get_str8(pb, buf, sizeof(buf));

142 }

143 // Skip extra header crap (this should never happen)

144 if ((startpos + header_size) > avio_tell(pb))

145 avio_skip(pb, header_size + startpos - avio_tell(pb));

146 if (bytes_per_minute)

147 st->codec->bit_rate = 8LL * bytes_per_minute / 60;

148 st->codec->sample_rate = 8000;

149 st->codec->channels = 1;

150 st->codec->channel_layout = AV_CH_LAYOUT_MONO;

151 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

152 st->codec->codec_id = AV_CODEC_ID_RA_144;

153 ast->deint_id = DEINT_ID_INT0;

154 } else {

155 int flavor, sub_packet_h, coded_framesize, sub_packet_size;

156 int codecdata_length;

157 unsigned bytes_per_minute;

158 /* old version (4) */

159 avio_skip(pb, 2); /* unused */

160 avio_rb32(pb); /* .ra4 */

161 avio_rb32(pb); /* data size */

162 avio_rb16(pb); /* version2 */

163 avio_rb32(pb); /* header size */

164 flavor= avio_rb16(pb); /* add codec info / flavor */

165 ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */

166 avio_rb32(pb); /* ??? */

167 bytes_per_minute = avio_rb32(pb);

168 if (version == 4) {

169 if (bytes_per_minute)

170 st->codec->bit_rate = 8LL * bytes_per_minute / 60;

171 }

172 avio_rb32(pb); /* ??? */

173 ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */

174 st->codec->block_align= avio_rb16(pb); /* frame size */

175 ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */

176 avio_rb16(pb); /* ??? */

177 if (version == 5) {

178 avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);

179 }

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

181 avio_rb32(pb);

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

183 if (version == 5) {

184 ast->deint_id = avio_rl32(pb);

185 avio_read(pb, buf, 4);

186 buf[4] = 0;

187 } else {

188 get_str8(pb, buf, sizeof(buf)); /* desc */

189 ast->deint_id = AV_RL32(buf);

190 get_str8(pb, buf, sizeof(buf)); /* desc */

191 }

192 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

193 st->codec->codec_tag = AV_RL32(buf);

194 st->codec->codec_id = ff_codec_get_id(ff_rm_codec_tags,

195 st->codec->codec_tag);

196

197 switch (st->codec->codec_id) {

198 case AV_CODEC_ID_AC3:

199 st->need_parsing = AVSTREAM_PARSE_FULL;

200 break;

201 case AV_CODEC_ID_RA_288:

202 st->codec->extradata_size= 0;

203 ast->audio_framesize = st->codec->block_align;

204 st->codec->block_align = coded_framesize;

205 break;

206 case AV_CODEC_ID_COOK:

207 st->need_parsing = AVSTREAM_PARSE_HEADERS;

208 case AV_CODEC_ID_ATRAC3:

209 case AV_CODEC_ID_SIPR:

210 if (read_all) {

211 codecdata_length = 0;

212 } else {

213 avio_rb16(pb); avio_r8(pb);

214 if (version == 5)

215 avio_r8(pb);

216 codecdata_length = avio_rb32(pb);

217 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){

218 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");

219 return -1;

220 }

221 }

222

223 ast->audio_framesize = st->codec->block_align;

224 if (st->codec->codec_id == AV_CODEC_ID_SIPR) {

225 if (flavor > 3) {

226 av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",

227 flavor);

228 return -1;

229 }

230 st->codec->block_align = ff_sipr_subpk_size[flavor];

231 } else {

232 if(sub_packet_size <= 0){

233 av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");

234 return -1;

235 }

236 st->codec->block_align = ast->sub_packet_size;

237 }

238 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)

239 return ret;

240

241 break;

242 case AV_CODEC_ID_AAC:

243 avio_rb16(pb); avio_r8(pb);

244 if (version == 5)

245 avio_r8(pb);

246 codecdata_length = avio_rb32(pb);

247 if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){

248 av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");

249 return -1;

250 }

251 if (codecdata_length >= 1) {

252 avio_r8(pb);

253 if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)

254 return ret;

255 }

256 break;

257 default:

258 av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));

259 }

260 switch (ast->deint_id) {

261 case DEINT_ID_INT4:

262 if (ast->coded_framesize > ast->audio_framesize ||

263 sub_packet_h <= 1 ||

264 ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)

265 return AVERROR_INVALIDDATA;

266 break;

267 case DEINT_ID_GENR:

268 if (ast->sub_packet_size <= 0 ||

269 ast->sub_packet_size > ast->audio_framesize)

270 return AVERROR_INVALIDDATA;

271 break;

272 case DEINT_ID_SIPR:

273 case DEINT_ID_INT0:

274 case DEINT_ID_VBRS:

275 case DEINT_ID_VBRF:

276 break;

277 default:

278 av_log(s, AV_LOG_ERROR, "Unknown interleaver %X\n", ast->deint_id);

279 return AVERROR_INVALIDDATA;

280 }

281 if (ast->deint_id == DEINT_ID_INT4 ||

282 ast->deint_id == DEINT_ID_GENR ||

283 ast->deint_id == DEINT_ID_SIPR) {

284 if (st->codec->block_align <= 0 ||

285 ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||

286 ast->audio_framesize * sub_packet_h < st->codec->block_align)

287 return AVERROR_INVALIDDATA;

288 if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)

289 return AVERROR(ENOMEM);

290 }

291

292 if (read_all) {

293 avio_r8(pb);

294 avio_r8(pb);

295 avio_r8(pb);

296 rm_read_metadata(s, pb, 0);

297 }

298 }

299 return 0;

300 }

301

302 int

303 ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,

304 AVStream *st, RMStream *rst, int codec_data_size, const uint8_t *mime)

305 {

306 unsigned int v;

307 int size;

308 int64_t codec_pos;

309 int ret;

310

311 avpriv_set_pts_info(st, 64, 1, 1000);

312 codec_pos = avio_tell(pb);

313 v = avio_rb32(pb);

314 if (v == MKTAG(0xfd, 'a', 'r', '.')) {

315 /* ra type header */

316 if (rm_read_audio_stream_info(s, pb, st, rst, 0))

317 return -1;

318 } else if (v == MKBETAG('L', 'S', 'D', ':')) {

319 avio_seek(pb, -4, SEEK_CUR);

320 if ((ret = rm_read_extradata(pb, st->codec, codec_data_size)) < 0)

321 return ret;

322

323 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

324 st->codec->codec_tag = AV_RL32(st->codec->extradata);

325 st->codec->codec_id = ff_codec_get_id(ff_rm_codec_tags,

326 st->codec->codec_tag);

327 } else if(mime && !strcmp(mime, "logical-fileinfo")){

328 int stream_count, rule_count, property_count, i;

329 ff_free_stream(s, st);

330 if (avio_rb16(pb) != 0) {

331 av_log(s, AV_LOG_WARNING, "Unsupported version\n");

332 goto skip;

333 }

334 stream_count = avio_rb16(pb);

335 avio_skip(pb, 6*stream_count);

336 rule_count = avio_rb16(pb);

337 avio_skip(pb, 2*rule_count);

338 property_count = avio_rb16(pb);

339 for(i=0; i<property_count; i++){

340 uint8_t name[128], val[128];

341 avio_rb32(pb);

342 if (avio_rb16(pb) != 0) {

343 av_log(s, AV_LOG_WARNING, "Unsupported Name value property version\n");

344 goto skip; //FIXME skip just this one

345 }

346 get_str8(pb, name, sizeof(name));

347 switch(avio_rb32(pb)) {

348 case 2: get_strl(pb, val, sizeof(val), avio_rb16(pb));

349 av_dict_set(&s->metadata, name, val, 0);

350 break;

351 default: avio_skip(pb, avio_rb16(pb));

352 }

353 }

354 } else {

355 int fps;

356 if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {

357 fail1:

358 av_log(s, AV_LOG_WARNING, "Unsupported stream type %08x\n", v);

359 goto skip;

360 }

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

362 st->codec->codec_id = ff_codec_get_id(ff_rm_codec_tags,

363 st->codec->codec_tag);

364 av_dlog(s, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));

365 if (st->codec->codec_id == AV_CODEC_ID_NONE)

366 goto fail1;

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

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

369 avio_skip(pb, 2); // looks like bits per sample

370 avio_skip(pb, 4); // always zero?

371 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

372 st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;

373 fps = avio_rb32(pb);

374

375 if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)

376 return ret;

377

378 if (fps > 0) {

379 av_reduce(&st->avg_frame_rate.den, &st->avg_frame_rate.num,

380 0x10000, fps, (1 << 30) - 1);

381 #if FF_API_R_FRAME_RATE

382 st->r_frame_rate = st->avg_frame_rate;

383 #endif

384 } else if (s->error_recognition & AV_EF_EXPLODE) {

385 av_log(s, AV_LOG_ERROR, "Invalid framerate\n");

386 return AVERROR_INVALIDDATA;

387 }

388 }

389

390 skip:

391 /* skip codec info */

392 size = avio_tell(pb) - codec_pos;

393 avio_skip(pb, codec_data_size - size);

394

395 return 0;

396 }

397

398 /** this function assumes that the demuxer has already seeked to the start

399 * of the INDX chunk, and will bail out if not. */

400 static int rm_read_index(AVFormatContext *s)

401 {

402 AVIOContext *pb = s->pb;

403 unsigned int size, n_pkts, str_id, next_off, n, pos, pts;

404 AVStream *st;

405

406 do {

407 if (avio_rl32(pb) != MKTAG('I','N','D','X'))

408 return -1;

409 size = avio_rb32(pb);

410 if (size < 20)

411 return -1;

412 avio_skip(pb, 2);

413 n_pkts = avio_rb32(pb);

414 str_id = avio_rb16(pb);

415 next_off = avio_rb32(pb);

416 for (n = 0; n < s->nb_streams; n++)

417 if (s->streams[n]->id == str_id) {

418 st = s->streams[n];

419 break;

420 }

421 if (n == s->nb_streams) {

422 av_log(s, AV_LOG_ERROR,

423 "Invalid stream index %d for index at pos %"PRId64"\n",

424 str_id, avio_tell(pb));

425 goto skip;

426 } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {

427 av_log(s, AV_LOG_ERROR,

428 "Nr. of packets in packet index for stream index %d "

429 "exceeds filesize (%"PRId64" at %"PRId64" = %"PRId64")\n",

430 str_id, avio_size(pb), avio_tell(pb),

431 (avio_size(pb) - avio_tell(pb)) / 14);

432 goto skip;

433 }

434

435 for (n = 0; n < n_pkts; n++) {

436 avio_skip(pb, 2);

437 pts = avio_rb32(pb);

438 pos = avio_rb32(pb);

439 avio_skip(pb, 4); /* packet no. */

440

441 av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);

442 }

443

444 skip:

445 if (next_off && avio_tell(pb) < next_off &&

446 avio_seek(pb, next_off, SEEK_SET) < 0) {

447 av_log(s, AV_LOG_ERROR,

448 "Non-linear index detected, not supported\n");

449 return -1;

450 }

451 } while (next_off);

452

453 return 0;

454 }

455

456 static int rm_read_header_old(AVFormatContext *s)

457 {

458 RMDemuxContext *rm = s->priv_data;

459 AVStream *st;

460

461 rm->old_format = 1;

462 st = avformat_new_stream(s, NULL);

463 if (!st)

464 return -1;

465 st->priv_data = ff_rm_alloc_rmstream();

466 return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);

467 }

468

469 static int rm_read_header(AVFormatContext *s)

470 {

471 RMDemuxContext *rm = s->priv_data;

472 AVStream *st;

473 AVIOContext *pb = s->pb;

474 unsigned int tag;

475 int tag_size;

476 unsigned int start_time, duration;

477 unsigned int data_off = 0, indx_off = 0;

478 char buf[128], mime[128];

479 int flags = 0;

480

481 tag = avio_rl32(pb);

482 if (tag == MKTAG('.', 'r', 'a', 0xfd)) {

483 /* very old .ra format */

484 return rm_read_header_old(s);

485 } else if (tag != MKTAG('.', 'R', 'M', 'F')) {

486 return AVERROR(EIO);

487 }

488

489 tag_size = avio_rb32(pb);

490 avio_skip(pb, tag_size - 8);

491

492 for(;;) {

493 if (url_feof(pb))

494 return -1;

495 tag = avio_rl32(pb);

496 tag_size = avio_rb32(pb);

497 avio_rb16(pb);

498 av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",

499 (tag ) & 0xff,

500 (tag >> 8) & 0xff,

501 (tag >> 16) & 0xff,

502 (tag >> 24) & 0xff,

503 tag,

504 tag_size);

505 if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))

506 return -1;

507 switch(tag) {

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

509 /* file header */

510 avio_rb32(pb); /* max bit rate */

511 avio_rb32(pb); /* avg bit rate */

512 avio_rb32(pb); /* max packet size */

513 avio_rb32(pb); /* avg packet size */

514 avio_rb32(pb); /* nb packets */

515 duration = avio_rb32(pb); /* duration */

516 s->duration = av_rescale(duration, AV_TIME_BASE, 1000);

517 avio_rb32(pb); /* preroll */

518 indx_off = avio_rb32(pb); /* index offset */

519 data_off = avio_rb32(pb); /* data offset */

520 avio_rb16(pb); /* nb streams */

521 flags = avio_rb16(pb); /* flags */

522 break;

523 case MKTAG('C', 'O', 'N', 'T'):

524 rm_read_metadata(s, pb, 1);

525 break;

526 case MKTAG('M', 'D', 'P', 'R'):

527 st = avformat_new_stream(s, NULL);

528 if (!st)

529 return AVERROR(ENOMEM);

530 st->id = avio_rb16(pb);

531 avio_rb32(pb); /* max bit rate */

532 st->codec->bit_rate = avio_rb32(pb); /* bit rate */

533 avio_rb32(pb); /* max packet size */

534 avio_rb32(pb); /* avg packet size */

535 start_time = avio_rb32(pb); /* start time */

536 avio_rb32(pb); /* preroll */

537 duration = avio_rb32(pb); /* duration */

538 st->start_time = start_time;

539 st->duration = duration;

540 if(duration>0)

541 s->duration = AV_NOPTS_VALUE;

542 get_str8(pb, buf, sizeof(buf)); /* desc */

543 get_str8(pb, mime, sizeof(mime)); /* mimetype */

544 st->codec->codec_type = AVMEDIA_TYPE_DATA;

545 st->priv_data = ff_rm_alloc_rmstream();

546 if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,

547 avio_rb32(pb), mime) < 0)

548 return -1;

549 break;

550 case MKTAG('D', 'A', 'T', 'A'):

551 goto header_end;

552 default:

553 /* unknown tag: skip it */

554 avio_skip(pb, tag_size - 10);

555 break;

556 }

557 }

558 header_end:

559 rm->nb_packets = avio_rb32(pb); /* number of packets */

560 if (!rm->nb_packets && (flags & 4))

561 rm->nb_packets = 3600 * 25;

562 avio_rb32(pb); /* next data header */

563

564 if (!data_off)

565 data_off = avio_tell(pb) - 18;

566 if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&

567 avio_seek(pb, indx_off, SEEK_SET) >= 0) {

568 rm_read_index(s);

569 avio_seek(pb, data_off + 18, SEEK_SET);

570 }

571

572 return 0;

573 }

574

575 static int get_num(AVIOContext *pb, int *len)

576 {

577 int n, n1;

578

579 n = avio_rb16(pb);

580 (*len)-=2;

581 n &= 0x7FFF;

582 if (n >= 0x4000) {

583 return n - 0x4000;

584 } else {

585 n1 = avio_rb16(pb);

586 (*len)-=2;

587 return (n << 16) | n1;

588 }

589 }

590

591 /* multiple of 20 bytes for ra144 (ugly) */

592 #define RAW_PACKET_SIZE 1000

593

594 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){

595 RMDemuxContext *rm = s->priv_data;

596 AVIOContext *pb = s->pb;

597 AVStream *st;

598 uint32_t state=0xFFFFFFFF;

599

600 while(!url_feof(pb)){

601 int len, num, i;

602 *pos= avio_tell(pb) - 3;

603 if(rm->remaining_len > 0){

604 num= rm->current_stream;

605 len= rm->remaining_len;

606 *timestamp = AV_NOPTS_VALUE;

607 *flags= 0;

608 }else{

609 state= (state<<8) + avio_r8(pb);

610

611 if(state == MKBETAG('I', 'N', 'D', 'X')){

612 int n_pkts, expected_len;

613 len = avio_rb32(pb);

614 avio_skip(pb, 2);

615 n_pkts = avio_rb32(pb);

616 expected_len = 20 + n_pkts * 14;

617 if (len == 20)

618 /* some files don't add index entries to chunk size... */

619 len = expected_len;

620 else if (len != expected_len)

621 av_log(s, AV_LOG_WARNING,

622 "Index size %d (%d pkts) is wrong, should be %d.\n",

623 len, n_pkts, expected_len);

624 len -= 14; // we already read part of the index header

625 if(len<0)

626 continue;

627 goto skip;

628 } else if (state == MKBETAG('D','A','T','A')) {

629 av_log(s, AV_LOG_WARNING,

630 "DATA tag in middle of chunk, file may be broken.\n");

631 }

632

633 if(state > (unsigned)0xFFFF || state <= 12)

634 continue;

635 len=state - 12;

636 state= 0xFFFFFFFF;

637

638 num = avio_rb16(pb);

639 *timestamp = avio_rb32(pb);

640 avio_r8(pb); /* reserved */

641 *flags = avio_r8(pb); /* flags */

642 }

643 for(i=0;i<s->nb_streams;i++) {

644 st = s->streams[i];

645 if (num == st->id)

646 break;

647 }

648 if (i == s->nb_streams) {

649 skip:

650 /* skip packet if unknown number */

651 avio_skip(pb, len);

652 rm->remaining_len = 0;

653 continue;

654 }

655 *stream_index= i;

656

657 return len;

658 }

659 return -1;

660 }

661

662 static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,

663 RMDemuxContext *rm, RMStream *vst,

664 AVPacket *pkt, int len, int *pseq,

665 int64_t *timestamp)

666 {

667 int hdr;

668 int seq = 0, pic_num = 0, len2 = 0, pos = 0; //init to silcense compiler warning

669 int type;

670 int ret;

671

672 hdr = avio_r8(pb); len--;

673 type = hdr >> 6;

674

675 if(type != 3){ // not frame as a part of packet

676 seq = avio_r8(pb); len--;

677 }

678 if(type != 1){ // not whole frame

679 len2 = get_num(pb, &len);

680 pos = get_num(pb, &len);

681 pic_num = avio_r8(pb); len--;

682 }

683 if(len<0) {

684 av_log(s, AV_LOG_ERROR, "Insufficient data\n");

685 return -1;

686 }

687 rm->remaining_len = len;

688 if(type&1){ // frame, not slice

689 if(type == 3){ // frame as a part of packet

690 len= len2;

691 *timestamp = pos;

692 }

693 if(rm->remaining_len < len) {

694 av_log(s, AV_LOG_ERROR, "Insufficient remaining len\n");

695 return -1;

696 }

697 rm->remaining_len -= len;

698 if(av_new_packet(pkt, len + 9) < 0)

699 return AVERROR(EIO);

700 pkt->data[0] = 0;

701 AV_WL32(pkt->data + 1, 1);

702 AV_WL32(pkt->data + 5, 0);

703 if ((ret = avio_read(pb, pkt->data + 9, len)) != len) {

704 av_free_packet(pkt);

705 av_log(s, AV_LOG_ERROR, "Failed to read %d bytes\n", len);

706 return ret < 0 ? ret : AVERROR(EIO);

707 }

708 return 0;

709 }

710 //now we have to deal with single slice

711

712 *pseq = seq;

713 if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){

714 if (len2 > ffio_limit(pb, len2)) {

715 av_log(s, AV_LOG_ERROR, "Impossibly sized packet\n");

716 return AVERROR_INVALIDDATA;

717 }

718 vst->slices = ((hdr & 0x3F) << 1) + 1;

719 vst->videobufsize = len2 + 8*vst->slices + 1;

720 av_free_packet(&vst->pkt); //FIXME this should be output.

721 if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)

722 return AVERROR(ENOMEM);

723 memset(vst->pkt.data, 0, vst->pkt.size);

724 vst->videobufpos = 8*vst->slices + 1;

725 vst->cur_slice = 0;

726 vst->curpic_num = pic_num;

727 vst->pktpos = avio_tell(pb);

728 }

729 if(type == 2)

730 len = FFMIN(len, pos);

731

732 if(++vst->cur_slice > vst->slices) {

733 av_log(s, AV_LOG_ERROR, "cur slice %d, too large\n", vst->cur_slice);

734 return 1;

735 }

736 if(!vst->pkt.data)

737 return AVERROR(ENOMEM);

738 AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);

739 AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);

740 if(vst->videobufpos + len > vst->videobufsize) {

741 av_log(s, AV_LOG_ERROR, "outside videobufsize\n");

742 return 1;

743 }

744 if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)

745 return AVERROR(EIO);

746 vst->videobufpos += len;

747 rm->remaining_len-= len;

748

749 if (type == 2 || vst->videobufpos == vst->videobufsize) {

750 vst->pkt.data[0] = vst->cur_slice-1;

751 *pkt= vst->pkt;

752 vst->pkt.data= NULL;

753 vst->pkt.size= 0;

754 vst->pkt.buf = NULL;

755 #if FF_API_DESTRUCT_PACKET

756 FF_DISABLE_DEPRECATION_WARNINGS

757 vst->pkt.destruct = NULL;

758 FF_ENABLE_DEPRECATION_WARNINGS

759 #endif

760 if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin

761 memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,

762 vst->videobufpos - 1 - 8*vst->slices);

763 pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);

764 pkt->pts = AV_NOPTS_VALUE;

765 pkt->pos = vst->pktpos;

766 vst->slices = 0;

767 return 0;

768 }

769

770 return 1;

771 }

772

773 static inline void

774 rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)

775 {

776 uint8_t *ptr;

777 int j;

778

779 if (st->codec->codec_id == AV_CODEC_ID_AC3) {

780 ptr = pkt->data;

781 for (j=0;j<pkt->size;j+=2) {

782 FFSWAP(int, ptr[0], ptr[1]);

783 ptr += 2;

784 }

785 }

786 }

787

788 static int readfull(AVFormatContext *s, AVIOContext *pb, uint8_t *dst, int n) {

789 int ret = avio_read(pb, dst, n);

790 if (ret != n) {

791 if (ret >= 0) memset(dst + ret, 0, n - ret);

792 else memset(dst , 0, n);

793 av_log(s, AV_LOG_ERROR, "Failed to fully read block\n");

794 }

795 return ret;

796 }

797

798 int

799 ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,

800 AVStream *st, RMStream *ast, int len, AVPacket *pkt,

801 int *seq, int flags, int64_t timestamp)

802 {

803 RMDemuxContext *rm = s->priv_data;

804 int ret;

805

806 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

807 rm->current_stream= st->id;

808 ret = rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp);

809 if(ret)

810 return ret < 0 ? ret : -1; //got partial frame or error

811 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

812 if ((ast->deint_id == DEINT_ID_GENR) ||

813 (ast->deint_id == DEINT_ID_INT4) ||

814 (ast->deint_id == DEINT_ID_SIPR)) {

815 int x;

816 int sps = ast->sub_packet_size;

817 int cfs = ast->coded_framesize;

818 int h = ast->sub_packet_h;

819 int y = ast->sub_packet_cnt;

820 int w = ast->audio_framesize;

821

822 if (flags & 2)

823 y = ast->sub_packet_cnt = 0;

824 if (!y)

825 ast->audiotimestamp = timestamp;

826

827 switch (ast->deint_id) {

828 case DEINT_ID_INT4:

829 for (x = 0; x < h/2; x++)

830 readfull(s, pb, ast->pkt.data+x*2*w+y*cfs, cfs);

831 break;

832 case DEINT_ID_GENR:

833 for (x = 0; x < w/sps; x++)

834 readfull(s, pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);

835 break;

836 case DEINT_ID_SIPR:

837 readfull(s, pb, ast->pkt.data + y * w, w);

838 break;

839 }

840

841 if (++(ast->sub_packet_cnt) < h)

842 return -1;

843 if (ast->deint_id == DEINT_ID_SIPR)

844 ff_rm_reorder_sipr_data(ast->pkt.data, h, w);

845

846 ast->sub_packet_cnt = 0;

847 rm->audio_stream_num = st->index;

848 rm->audio_pkt_cnt = h * w / st->codec->block_align;

849 } else if ((ast->deint_id == DEINT_ID_VBRF) ||

850 (ast->deint_id == DEINT_ID_VBRS)) {

851 int x;

852 rm->audio_stream_num = st->index;

853 ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;

854 if (ast->sub_packet_cnt) {

855 for (x = 0; x < ast->sub_packet_cnt; x++)

856 ast->sub_packet_lengths[x] = avio_rb16(pb);

857 rm->audio_pkt_cnt = ast->sub_packet_cnt;

858 ast->audiotimestamp = timestamp;

859 } else

860 return -1;

861 } else {

862 av_get_packet(pb, pkt, len);

863 rm_ac3_swap_bytes(st, pkt);

864 }

865 } else

866 av_get_packet(pb, pkt, len);

867

868 pkt->stream_index = st->index;

869

870 #if 0

871 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

872 if(st->codec->codec_id == AV_CODEC_ID_RV20){

873 int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);

874 av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);

875

876 seq |= (timestamp&~0x3FFF);

877 if(seq - timestamp > 0x2000) seq -= 0x4000;

878 if(seq - timestamp < -0x2000) seq += 0x4000;

879 }

880 }

881 #endif

882

883 pkt->pts = timestamp;

884 if (flags & 2)

885 pkt->flags |= AV_PKT_FLAG_KEY;

886

887 return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;

888 }

889

890 int

891 ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,

892 AVStream *st, RMStream *ast, AVPacket *pkt)

893 {

894 RMDemuxContext *rm = s->priv_data;

895

896 av_assert0 (rm->audio_pkt_cnt > 0);

897

898 if (ast->deint_id == DEINT_ID_VBRF ||

899 ast->deint_id == DEINT_ID_VBRS)

900 av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);

901 else {

902 if(av_new_packet(pkt, st->codec->block_align) < 0)

903 return AVERROR(ENOMEM);

904 memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this

905 (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),

906 st->codec->block_align);

907 }

908 rm->audio_pkt_cnt--;

909 if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {

910 ast->audiotimestamp = AV_NOPTS_VALUE;

911 pkt->flags = AV_PKT_FLAG_KEY;

912 } else

913 pkt->flags = 0;

914 pkt->stream_index = st->index;

915

916 return rm->audio_pkt_cnt;

917 }

918

919 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)

920 {

921 RMDemuxContext *rm = s->priv_data;

922 AVStream *st = NULL; // init to silence compiler warning

923 int i, len, res, seq = 1;

924 int64_t timestamp, pos;

925 int flags;

926

927 for (;;) {

928 if (rm->audio_pkt_cnt) {

929 // If there are queued audio packet return them first

930 st = s->streams[rm->audio_stream_num];

931 res = ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);

932 if(res < 0)

933 return res;

934 flags = 0;

935 } else {

936 if (rm->old_format) {

937 RMStream *ast;

938

939 st = s->streams[0];

940 ast = st->priv_data;

941 timestamp = AV_NOPTS_VALUE;

942 len = !ast->audio_framesize ? RAW_PACKET_SIZE :

943 ast->coded_framesize * ast->sub_packet_h / 2;

944 flags = (seq++ == 1) ? 2 : 0;

945 pos = avio_tell(s->pb);

946 } else {

947 len=sync(s, &timestamp, &flags, &i, &pos);

948 if (len > 0)

949 st = s->streams[i];

950 }

951

952 if(len<0 || url_feof(s->pb))

953 return AVERROR(EIO);

954

955 res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,

956 &seq, flags, timestamp);

957 if (res < -1)

958 return res;

959 if((flags&2) && (seq&0x7F) == 1)

960 av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);

961 if (res)

962 continue;

963 }

964

965 if( (st->discard >= AVDISCARD_NONKEY && !(flags&2))

966 || st->discard >= AVDISCARD_ALL){

967 av_free_packet(pkt);

968 } else

969 break;

970 }

971

972 return 0;

973 }

974

975 static int rm_read_close(AVFormatContext *s)

976 {

977 int i;

978

979 for (i=0;i<s->nb_streams;i++)

980 ff_rm_free_rmstream(s->streams[i]->priv_data);

981

982 return 0;

983 }

984

985 static int rm_probe(AVProbeData *p)

986 {

987 /* check file header */

988 if ((p->buf[0] == '.' && p->buf[1] == 'R' &&

989 p->buf[2] == 'M' && p->buf[3] == 'F' &&

990 p->buf[4] == 0 && p->buf[5] == 0) ||

991 (p->buf[0] == '.' && p->buf[1] == 'r' &&

992 p->buf[2] == 'a' && p->buf[3] == 0xfd))

993 return AVPROBE_SCORE_MAX;

994 else

995 return 0;

996 }

997

998 static int64_t rm_read_dts(AVFormatContext *s, int stream_index,

999 int64_t *ppos, int64_t pos_limit)

1000 {

1001 RMDemuxContext *rm = s->priv_data;

1002 int64_t pos, dts;

1003 int stream_index2, flags, len, h;

1004

1005 pos = *ppos;

1006

1007 if(rm->old_format)

1008 return AV_NOPTS_VALUE;

1009

1010 if (avio_seek(s->pb, pos, SEEK_SET) < 0)

1011 return AV_NOPTS_VALUE;

1012

1013 rm->remaining_len=0;

1014 for(;;){

1015 int seq=1;

1016 AVStream *st;

1017

1018 len=sync(s, &dts, &flags, &stream_index2, &pos);

1019 if(len<0)

1020 return AV_NOPTS_VALUE;

1021

1022 st = s->streams[stream_index2];

1023 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

1024 h= avio_r8(s->pb); len--;

1025 if(!(h & 0x40)){

1026 seq = avio_r8(s->pb); len--;

1027 }

1028 }

1029

1030 if((flags&2) && (seq&0x7F) == 1){

1031 av_dlog(s, "%d %d-%d %"PRId64" %d\n",

1032 flags, stream_index2, stream_index, dts, seq);

1033 av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);

1034 if(stream_index2 == stream_index)

1035 break;

1036 }

1037

1038 avio_skip(s->pb, len);

1039 }

1040 *ppos = pos;

1041 return dts;

1042 }

1043

1044 static int rm_read_seek(AVFormatContext *s, int stream_index,

1045 int64_t pts, int flags)

1046 {

1047 RMDemuxContext *rm = s->priv_data;

1048

1049 if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)

1050 return -1;

1051 rm->audio_pkt_cnt = 0;

1052 return 0;

1053 }

1054

1055

1056 AVInputFormat ff_rm_demuxer = {

1057 .name = "rm",

1058 .long_name = NULL_IF_CONFIG_SMALL("RealMedia"),

1059 .priv_data_size = sizeof(RMDemuxContext),

1060 .read_probe = rm_probe,

1061 .read_header = rm_read_header,

1062 .read_packet = rm_read_packet,

1063 .read_close = rm_read_close,

1064 .read_timestamp = rm_read_dts,

1065 .read_seek = rm_read_seek,

1066 };

1067

1068 AVInputFormat ff_rdt_demuxer = {

1069 .name = "rdt",

1070 .long_name = NULL_IF_CONFIG_SMALL("RDT demuxer"),

1071 .priv_data_size = sizeof(RMDemuxContext),

1072 .read_close = rm_read_close,

1073 .flags = AVFMT_NOFILE,

1074 };

Generated on Sat Jan 25 2014 19:52:04 for FFmpeg by doxygen 1.8.2