FFmpeg: libavformat/nutdec.c Source File

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libavformat

nutdec.c

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1 /*

2 * "NUT" Container Format demuxer

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 #include "libavutil/avstring.h"

24 #include "libavutil/avassert.h"

25 #include "libavutil/bswap.h"

26 #include "libavutil/dict.h"

27 #include "libavutil/intreadwrite.h"

28 #include "libavutil/mathematics.h"

29 #include "libavutil/tree.h"

30 #include "libavcodec/bytestream.h"

31 #include "avio_internal.h"

32 #include "nut.h"

33 #include "riff.h"

35 #define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */

37 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,

38 int64_t *pos_arg, int64_t pos_limit);

40 static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)

41 {

42 unsigned int len = ffio_read_varlen(bc);

44 if (len && maxlen)

45 avio_read(bc, string, FFMIN(len, maxlen));

46 while (len > maxlen) {

47 avio_r8(bc);

48 len--;

49 }

51 if (maxlen)

52 string[FFMIN(len, maxlen - 1)] = 0;

54 if (maxlen == len)

55 return -1;

56 else

57 return 0;

58 }

60 static int64_t get_s(AVIOContext *bc)

61 {

62 int64_t v = ffio_read_varlen(bc) + 1;

64 if (v & 1)

65 return -(v >> 1);

66 else

67 return (v >> 1);

68 }

70 static uint64_t get_fourcc(AVIOContext *bc)

71 {

72 unsigned int len = ffio_read_varlen(bc);

74 if (len == 2)

75 return avio_rl16(bc);

76 else if (len == 4)

77 return avio_rl32(bc);

78 else {

79 av_log(NULL, AV_LOG_ERROR, "Unsupported fourcc length %d\n", len);

80 return -1;

81 }

82 }

84 #ifdef TRACE

85 static inline uint64_t get_v_trace(AVIOContext *bc, const char *file,

86 const char *func, int line)

87 {

88 uint64_t v = ffio_read_varlen(bc);

90 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n",

91 v, v, file, func, line);

92 return v;

93 }

95 static inline int64_t get_s_trace(AVIOContext *bc, const char *file,

96 const char *func, int line)

97 {

98 int64_t v = get_s(bc);

100 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n",

101 v, v, file, func, line);

102 return v;

103 }

104

105 static inline uint64_t get_4cc_trace(AVIOContext *bc, char *file,

106 char *func, int line)

107 {

108 uint64_t v = get_fourcc(bc);

109

110 av_log(NULL, AV_LOG_DEBUG, "get_fourcc %5"PRId64" / %"PRIX64" in %s %s:%d\n",

111 v, v, file, func, line);

112 return v;

113 }

114 #define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)

115 #define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)

116 #define get_fourcc(bc) get_4cc_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)

117 #endif

118

119 static int get_packetheader(NUTContext *nut, AVIOContext *bc,

120 int calculate_checksum, uint64_t startcode)

121 {

122 int64_t size;

123 // start = avio_tell(bc) - 8;

124

125 startcode = av_be2ne64(startcode);

126 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);

127

128 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);

129 size = ffio_read_varlen(bc);

130 if (size > 4096)

131 avio_rb32(bc);

132 if (ffio_get_checksum(bc) && size > 4096)

133 return -1;

134

135 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);

136

137 return size;

138 }

139

140 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)

141 {

142 uint64_t state = 0;

143

144 if (pos >= 0)

145 /* Note, this may fail if the stream is not seekable, but that should

146 * not matter, as in this case we simply start where we currently are */

147 avio_seek(bc, pos, SEEK_SET);

148 while (!url_feof(bc)) {

149 state = (state << 8) | avio_r8(bc);

150 if ((state >> 56) != 'N')

151 continue;

152 switch (state) {

153 case MAIN_STARTCODE:

154 case STREAM_STARTCODE:

155 case SYNCPOINT_STARTCODE:

156 case INFO_STARTCODE:

157 case INDEX_STARTCODE:

158 return state;

159 }

160 }

161

162 return 0;

163 }

164

165 /**

166 * Find the given startcode.

167 * @param code the startcode

168 * @param pos the start position of the search, or -1 if the current position

169 * @return the position of the startcode or -1 if not found

170 */

171 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)

172 {

173 for (;;) {

174 uint64_t startcode = find_any_startcode(bc, pos);

175 if (startcode == code)

176 return avio_tell(bc) - 8;

177 else if (startcode == 0)

178 return -1;

179 pos = -1;

180 }

181 }

182

183 static int nut_probe(AVProbeData *p)

184 {

185 int i;

186 uint64_t code = 0;

187

188 for (i = 0; i < p->buf_size; i++) {

189 code = (code << 8) | p->buf[i];

190 if (code == MAIN_STARTCODE)

191 return AVPROBE_SCORE_MAX;

192 }

193 return 0;

194 }

195

196 #define GET_V(dst, check) \

197 do { \

198 tmp = ffio_read_varlen(bc); \

199 if (!(check)) { \

200 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \

201 return AVERROR_INVALIDDATA; \

202 } \

203 dst = tmp; \

204 } while (0)

205

206 static int skip_reserved(AVIOContext *bc, int64_t pos)

207 {

208 pos -= avio_tell(bc);

209 if (pos < 0) {

210 avio_seek(bc, pos, SEEK_CUR);

211 return AVERROR_INVALIDDATA;

212 } else {

213 while (pos--)

214 avio_r8(bc);

215 return 0;

216 }

217 }

218

219 static int decode_main_header(NUTContext *nut)

220 {

221 AVFormatContext *s = nut->avf;

222 AVIOContext *bc = s->pb;

223 uint64_t tmp, end;

224 unsigned int stream_count;

225 int i, j, count;

226 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;

227

228 end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);

229 end += avio_tell(bc);

230

231 tmp = ffio_read_varlen(bc);

232 if (tmp < 2 && tmp > 4) {

233 av_log(s, AV_LOG_ERROR, "Version %"PRId64" not supported.\n",

234 tmp);

235 return AVERROR(ENOSYS);

236 }

237 nut->version = tmp;

238 if (nut->version > 3)

239 nut->minor_version = ffio_read_varlen(bc);

240

241 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);

242

243 nut->max_distance = ffio_read_varlen(bc);

244 if (nut->max_distance > 65536) {

245 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);

246 nut->max_distance = 65536;

247 }

248

249 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational));

250 nut->time_base = av_malloc(nut->time_base_count * sizeof(AVRational));

251 if (!nut->time_base)

252 return AVERROR(ENOMEM);

253

254 for (i = 0; i < nut->time_base_count; i++) {

255 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));

256 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));

257 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {

258 av_log(s, AV_LOG_ERROR, "time base invalid\n");

259 return AVERROR_INVALIDDATA;

260 }

261 }

262 tmp_pts = 0;

263 tmp_mul = 1;

264 tmp_stream = 0;

265 tmp_head_idx = 0;

266 for (i = 0; i < 256;) {

267 int tmp_flags = ffio_read_varlen(bc);

268 int tmp_fields = ffio_read_varlen(bc);

269

270 if (tmp_fields > 0)

271 tmp_pts = get_s(bc);

272 if (tmp_fields > 1)

273 tmp_mul = ffio_read_varlen(bc);

274 if (tmp_fields > 2)

275 tmp_stream = ffio_read_varlen(bc);

276 if (tmp_fields > 3)

277 tmp_size = ffio_read_varlen(bc);

278 else

279 tmp_size = 0;

280 if (tmp_fields > 4)

281 tmp_res = ffio_read_varlen(bc);

282 else

283 tmp_res = 0;

284 if (tmp_fields > 5)

285 count = ffio_read_varlen(bc);

286 else

287 count = tmp_mul - tmp_size;

288 if (tmp_fields > 6)

289 get_s(bc);

290 if (tmp_fields > 7)

291 tmp_head_idx = ffio_read_varlen(bc);

292

293 while (tmp_fields-- > 8)

294 ffio_read_varlen(bc);

295

296 if (count == 0 || i + count > 256) {

297 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);

298 return AVERROR_INVALIDDATA;

299 }

300 if (tmp_stream >= stream_count) {

301 av_log(s, AV_LOG_ERROR, "illegal stream number\n");

302 return AVERROR_INVALIDDATA;

303 }

304

305 for (j = 0; j < count; j++, i++) {

306 if (i == 'N') {

307 nut->frame_code[i].flags = FLAG_INVALID;

308 j--;

309 continue;

310 }

311 nut->frame_code[i].flags = tmp_flags;

312 nut->frame_code[i].pts_delta = tmp_pts;

313 nut->frame_code[i].stream_id = tmp_stream;

314 nut->frame_code[i].size_mul = tmp_mul;

315 nut->frame_code[i].size_lsb = tmp_size + j;

316 nut->frame_code[i].reserved_count = tmp_res;

317 nut->frame_code[i].header_idx = tmp_head_idx;

318 }

319 }

320 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);

321

322 if (end > avio_tell(bc) + 4) {

323 int rem = 1024;

324 GET_V(nut->header_count, tmp < 128U);

325 nut->header_count++;

326 for (i = 1; i < nut->header_count; i++) {

327 uint8_t *hdr;

328 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);

329 rem -= nut->header_len[i];

330 if (rem < 0) {

331 av_log(s, AV_LOG_ERROR, "invalid elision header\n");

332 return AVERROR_INVALIDDATA;

333 }

334 hdr = av_malloc(nut->header_len[i]);

335 if (!hdr)

336 return AVERROR(ENOMEM);

337 avio_read(bc, hdr, nut->header_len[i]);

338 nut->header[i] = hdr;

339 }

340 av_assert0(nut->header_len[0] == 0);

341 }

342

343 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {

344 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");

345 return AVERROR_INVALIDDATA;

346 }

347

348 nut->stream = av_calloc(stream_count, sizeof(StreamContext));

349 if (!nut->stream)

350 return AVERROR(ENOMEM);

351 for (i = 0; i < stream_count; i++)

352 avformat_new_stream(s, NULL);

353

354 return 0;

355 }

356

357 static int decode_stream_header(NUTContext *nut)

358 {

359 AVFormatContext *s = nut->avf;

360 AVIOContext *bc = s->pb;

361 StreamContext *stc;

362 int class, stream_id;

363 uint64_t tmp, end;

364 AVStream *st;

365

366 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);

367 end += avio_tell(bc);

368

369 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);

370 stc = &nut->stream[stream_id];

371 st = s->streams[stream_id];

372 if (!st)

373 return AVERROR(ENOMEM);

374

375 class = ffio_read_varlen(bc);

376 tmp = get_fourcc(bc);

377 st->codec->codec_tag = tmp;

378 switch (class) {

379 case 0:

380 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

381 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {

382 ff_nut_video_tags,

383 ff_codec_bmp_tags,

384 0

385 },

386 tmp);

387 break;

388 case 1:

389 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

390 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {

391 ff_nut_audio_tags,

392 ff_codec_wav_tags,

393 0

394 },

395 tmp);

396 break;

397 case 2:

398 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

399 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);

400 break;

401 case 3:

402 st->codec->codec_type = AVMEDIA_TYPE_DATA;

403 st->codec->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp);

404 break;

405 default:

406 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);

407 return AVERROR(ENOSYS);

408 }

409 if (class < 3 && st->codec->codec_id == AV_CODEC_ID_NONE)

410 av_log(s, AV_LOG_ERROR,

411 "Unknown codec tag '0x%04x' for stream number %d\n",

412 (unsigned int) tmp, stream_id);

413

414 GET_V(stc->time_base_id, tmp < nut->time_base_count);

415 GET_V(stc->msb_pts_shift, tmp < 16);

416 stc->max_pts_distance = ffio_read_varlen(bc);

417 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true

418 st->codec->has_b_frames = stc->decode_delay;

419 ffio_read_varlen(bc); // stream flags

420

421 GET_V(st->codec->extradata_size, tmp < (1 << 30));

422 if (st->codec->extradata_size) {

423 if (ff_get_extradata(st->codec, bc, st->codec->extradata_size) < 0)

424 return AVERROR(ENOMEM);

425 }

426

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

428 GET_V(st->codec->width, tmp > 0);

429 GET_V(st->codec->height, tmp > 0);

430 st->sample_aspect_ratio.num = ffio_read_varlen(bc);

431 st->sample_aspect_ratio.den = ffio_read_varlen(bc);

432 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {

433 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",

434 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);

435 return AVERROR_INVALIDDATA;

436 }

437 ffio_read_varlen(bc); /* csp type */

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

439 GET_V(st->codec->sample_rate, tmp > 0);

440 ffio_read_varlen(bc); // samplerate_den

441 GET_V(st->codec->channels, tmp > 0);

442 }

443 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {

444 av_log(s, AV_LOG_ERROR,

445 "stream header %d checksum mismatch\n", stream_id);

446 return AVERROR_INVALIDDATA;

447 }

448 stc->time_base = &nut->time_base[stc->time_base_id];

449 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,

450 stc->time_base->den);

451 return 0;

452 }

453

454 static void set_disposition_bits(AVFormatContext *avf, char *value,

455 int stream_id)

456 {

457 int flag = 0, i;

458

459 for (i = 0; ff_nut_dispositions[i].flag; ++i)

460 if (!strcmp(ff_nut_dispositions[i].str, value))

461 flag = ff_nut_dispositions[i].flag;

462 if (!flag)

463 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);

464 for (i = 0; i < avf->nb_streams; ++i)

465 if (stream_id == i || stream_id == -1)

466 avf->streams[i]->disposition |= flag;

467 }

468

469 static int decode_info_header(NUTContext *nut)

470 {

471 AVFormatContext *s = nut->avf;

472 AVIOContext *bc = s->pb;

473 uint64_t tmp, chapter_start, chapter_len;

474 unsigned int stream_id_plus1, count;

475 int chapter_id, i;

476 int64_t value, end;

477 char name[256], str_value[1024], type_str[256];

478 const char *type;

479 AVChapter *chapter = NULL;

480 AVStream *st = NULL;

481 AVDictionary **metadata = NULL;

482

483 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);

484 end += avio_tell(bc);

485

486 GET_V(stream_id_plus1, tmp <= s->nb_streams);

487 chapter_id = get_s(bc);

488 chapter_start = ffio_read_varlen(bc);

489 chapter_len = ffio_read_varlen(bc);

490 count = ffio_read_varlen(bc);

491

492 if (chapter_id && !stream_id_plus1) {

493 int64_t start = chapter_start / nut->time_base_count;

494 chapter = avpriv_new_chapter(s, chapter_id,

495 nut->time_base[chapter_start %

496 nut->time_base_count],

497 start, start + chapter_len, NULL);

498 metadata = &chapter->metadata;

499 } else if (stream_id_plus1) {

500 st = s->streams[stream_id_plus1 - 1];

501 metadata = &st->metadata;

502 } else

503 metadata = &s->metadata;

504

505 for (i = 0; i < count; i++) {

506 get_str(bc, name, sizeof(name));

507 value = get_s(bc);

508 if (value == -1) {

509 type = "UTF-8";

510 get_str(bc, str_value, sizeof(str_value));

511 } else if (value == -2) {

512 get_str(bc, type_str, sizeof(type_str));

513 type = type_str;

514 get_str(bc, str_value, sizeof(str_value));

515 } else if (value == -3) {

516 type = "s";

517 value = get_s(bc);

518 } else if (value == -4) {

519 type = "t";

520 value = ffio_read_varlen(bc);

521 } else if (value < -4) {

522 type = "r";

523 get_s(bc);

524 } else {

525 type = "v";

526 }

527

528 if (stream_id_plus1 > s->nb_streams) {

529 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");

530 continue;

531 }

532

533 if (!strcmp(type, "UTF-8")) {

534 if (chapter_id == 0 && !strcmp(name, "Disposition")) {

535 set_disposition_bits(s, str_value, stream_id_plus1 - 1);

536 continue;

537 }

538

539 if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) {

540 sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den);

541 if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den)

542 st->r_frame_rate.num = st->r_frame_rate.den = 0;

543 continue;

544 }

545

546 if (metadata && av_strcasecmp(name, "Uses") &&

547 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces"))

548 av_dict_set(metadata, name, str_value, 0);

549 }

550 }

551

552 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {

553 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");

554 return AVERROR_INVALIDDATA;

555 }

556 return 0;

557 }

558

559 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)

560 {

561 AVFormatContext *s = nut->avf;

562 AVIOContext *bc = s->pb;

563 int64_t end;

564 uint64_t tmp;

565 int ret;

566

567 nut->last_syncpoint_pos = avio_tell(bc) - 8;

568

569 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);

570 end += avio_tell(bc);

571

572 tmp = ffio_read_varlen(bc);

573 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);

574 if (*back_ptr < 0)

575 return AVERROR_INVALIDDATA;

576

577 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],

578 tmp / nut->time_base_count);

579

580 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {

581 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");

582 return AVERROR_INVALIDDATA;

583 }

584

585 *ts = tmp / nut->time_base_count *

586 av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE;

587

588 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0)

589 return ret;

590

591 return 0;

592 }

593

594 //FIXME calculate exactly, this is just a good approximation.

595 static int64_t find_duration(NUTContext *nut, int64_t filesize)

596 {

597 AVFormatContext *s = nut->avf;

598 int64_t duration = 0;

599

600 ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp);

601

602 if(duration > 0)

603 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;

604 return duration;

605 }

606

607 static int find_and_decode_index(NUTContext *nut)

608 {

609 AVFormatContext *s = nut->avf;

610 AVIOContext *bc = s->pb;

611 uint64_t tmp, end;

612 int i, j, syncpoint_count;

613 int64_t filesize = avio_size(bc);

614 int64_t *syncpoints;

615 uint64_t max_pts;

616 int8_t *has_keyframe;

617 int ret = AVERROR_INVALIDDATA;

618

619 if(filesize <= 0)

620 return -1;

621

622 avio_seek(bc, filesize - 12, SEEK_SET);

623 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);

624 if (avio_rb64(bc) != INDEX_STARTCODE) {

625 av_log(s, AV_LOG_ERROR, "no index at the end\n");

626

627 if(s->duration<=0)

628 s->duration = find_duration(nut, filesize);

629 return ret;

630 }

631

632 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);

633 end += avio_tell(bc);

634

635 max_pts = ffio_read_varlen(bc);

636 s->duration = av_rescale_q(max_pts / nut->time_base_count,

637 nut->time_base[max_pts % nut->time_base_count],

638 AV_TIME_BASE_Q);

639 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;

640

641 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);

642 syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t));

643 has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t));

644 if (!syncpoints || !has_keyframe) {

645 ret = AVERROR(ENOMEM);

646 goto fail;

647 }

648 for (i = 0; i < syncpoint_count; i++) {

649 syncpoints[i] = ffio_read_varlen(bc);

650 if (syncpoints[i] <= 0)

651 goto fail;

652 if (i)

653 syncpoints[i] += syncpoints[i - 1];

654 }

655

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

657 int64_t last_pts = -1;

658 for (j = 0; j < syncpoint_count;) {

659 uint64_t x = ffio_read_varlen(bc);

660 int type = x & 1;

661 int n = j;

662 x >>= 1;

663 if (type) {

664 int flag = x & 1;

665 x >>= 1;

666 if (n + x >= syncpoint_count + 1) {

667 av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1);

668 goto fail;

669 }

670 while (x--)

671 has_keyframe[n++] = flag;

672 has_keyframe[n++] = !flag;

673 } else {

674 while (x != 1) {

675 if (n >= syncpoint_count + 1) {

676 av_log(s, AV_LOG_ERROR, "index overflow B\n");

677 goto fail;

678 }

679 has_keyframe[n++] = x & 1;

680 x >>= 1;

681 }

682 }

683 if (has_keyframe[0]) {

684 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");

685 goto fail;

686 }

687 av_assert0(n <= syncpoint_count + 1);

688 for (; j < n && j < syncpoint_count; j++) {

689 if (has_keyframe[j]) {

690 uint64_t B, A = ffio_read_varlen(bc);

691 if (!A) {

692 A = ffio_read_varlen(bc);

693 B = ffio_read_varlen(bc);

694 // eor_pts[j][i] = last_pts + A + B

695 } else

696 B = 0;

697 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],

698 last_pts + A, 0, 0, AVINDEX_KEYFRAME);

699 last_pts += A + B;

700 }

701 }

702 }

703 }

704

705 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {

706 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");

707 goto fail;

708 }

709 ret = 0;

710

711 fail:

712 av_free(syncpoints);

713 av_free(has_keyframe);

714 return ret;

715 }

716

717 static int nut_read_header(AVFormatContext *s)

718 {

719 NUTContext *nut = s->priv_data;

720 AVIOContext *bc = s->pb;

721 int64_t pos;

722 int initialized_stream_count;

723

724 nut->avf = s;

725

726 /* main header */

727 pos = 0;

728 do {

729 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;

730 if (pos < 0 + 1) {

731 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");

732 return AVERROR_INVALIDDATA;

733 }

734 } while (decode_main_header(nut) < 0);

735

736 /* stream headers */

737 pos = 0;

738 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {

739 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;

740 if (pos < 0 + 1) {

741 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");

742 return AVERROR_INVALIDDATA;

743 }

744 if (decode_stream_header(nut) >= 0)

745 initialized_stream_count++;

746 }

747

748 /* info headers */

749 pos = 0;

750 for (;;) {

751 uint64_t startcode = find_any_startcode(bc, pos);

752 pos = avio_tell(bc);

753

754 if (startcode == 0) {

755 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");

756 return AVERROR_INVALIDDATA;

757 } else if (startcode == SYNCPOINT_STARTCODE) {

758 nut->next_startcode = startcode;

759 break;

760 } else if (startcode != INFO_STARTCODE) {

761 continue;

762 }

763

764 decode_info_header(nut);

765 }

766

767 s->data_offset = pos - 8;

768

769 if (bc->seekable) {

770 int64_t orig_pos = avio_tell(bc);

771 find_and_decode_index(nut);

772 avio_seek(bc, orig_pos, SEEK_SET);

773 }

774 av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE);

775

776 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);

777

778 return 0;

779 }

780

781 static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)

782 {

783 int count = ffio_read_varlen(bc);

784 int skip_start = 0;

785 int skip_end = 0;

786 int channels = 0;

787 int64_t channel_layout = 0;

788 int sample_rate = 0;

789 int width = 0;

790 int height = 0;

791 int i;

792

793 for (i=0; i<count; i++) {

794 uint8_t name[256], str_value[256], type_str[256];

795 int value;

796 if (avio_tell(bc) >= maxpos)

797 return AVERROR_INVALIDDATA;

798 get_str(bc, name, sizeof(name));

799 value = get_s(bc);

800

801 if (value == -1) {

802 get_str(bc, str_value, sizeof(str_value));

803 av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value);

804 } else if (value == -2) {

805 uint8_t *dst = NULL;

806 int64_t v64, value_len;

807

808 get_str(bc, type_str, sizeof(type_str));

809 value_len = ffio_read_varlen(bc);

810 if (avio_tell(bc) + value_len >= maxpos)

811 return AVERROR_INVALIDDATA;

812 if (!strcmp(name, "Palette")) {

813 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len);

814 } else if (!strcmp(name, "Extradata")) {

815 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len);

816 } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) {

817 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, value_len + 8);

818 if(!dst)

819 return AVERROR(ENOMEM);

820 AV_WB64(dst, v64);

821 dst += 8;

822 } else if (!strcmp(name, "ChannelLayout") && value_len == 8) {

823 channel_layout = avio_rl64(bc);

824 continue;

825 } else {

826 av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str);

827 avio_skip(bc, value_len);

828 continue;

829 }

830 if(!dst)

831 return AVERROR(ENOMEM);

832 avio_read(bc, dst, value_len);

833 } else if (value == -3) {

834 value = get_s(bc);

835 } else if (value == -4) {

836 value = ffio_read_varlen(bc);

837 } else if (value < -4) {

838 get_s(bc);

839 } else {

840 if (!strcmp(name, "SkipStart")) {

841 skip_start = value;

842 } else if (!strcmp(name, "SkipEnd")) {

843 skip_end = value;

844 } else if (!strcmp(name, "Channels")) {

845 channels = value;

846 } else if (!strcmp(name, "SampleRate")) {

847 sample_rate = value;

848 } else if (!strcmp(name, "Width")) {

849 width = value;

850 } else if (!strcmp(name, "Height")) {

851 height = value;

852 } else {

853 av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name);

854 }

855 }

856 }

857

858 if (channels || channel_layout || sample_rate || width || height) {

859 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PARAM_CHANGE, 28);

860 if (!dst)

861 return AVERROR(ENOMEM);

862 bytestream_put_le32(&dst,

863 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT*(!!channels) +

864 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT*(!!channel_layout) +

865 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) +

866 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height))

867 );

868 if (channels)

869 bytestream_put_le32(&dst, channels);

870 if (channel_layout)

871 bytestream_put_le64(&dst, channel_layout);

872 if (sample_rate)

873 bytestream_put_le32(&dst, sample_rate);

874 if (width || height){

875 bytestream_put_le32(&dst, width);

876 bytestream_put_le32(&dst, height);

877 }

878 }

879

880 if (skip_start || skip_end) {

881 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10);

882 if (!dst)

883 return AVERROR(ENOMEM);

884 AV_WL32(dst, skip_start);

885 AV_WL32(dst+4, skip_end);

886 }

887

888 return 0;

889 }

890

891 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,

892 uint8_t *header_idx, int frame_code)

893 {

894 AVFormatContext *s = nut->avf;

895 AVIOContext *bc = s->pb;

896 StreamContext *stc;

897 int size, flags, size_mul, pts_delta, i, reserved_count;

898 uint64_t tmp;

899

900 if (avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {

901 av_log(s, AV_LOG_ERROR,

902 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",

903 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);

904 return AVERROR_INVALIDDATA;

905 }

906

907 flags = nut->frame_code[frame_code].flags;

908 size_mul = nut->frame_code[frame_code].size_mul;

909 size = nut->frame_code[frame_code].size_lsb;

910 *stream_id = nut->frame_code[frame_code].stream_id;

911 pts_delta = nut->frame_code[frame_code].pts_delta;

912 reserved_count = nut->frame_code[frame_code].reserved_count;

913 *header_idx = nut->frame_code[frame_code].header_idx;

914

915 if (flags & FLAG_INVALID)

916 return AVERROR_INVALIDDATA;

917 if (flags & FLAG_CODED)

918 flags ^= ffio_read_varlen(bc);

919 if (flags & FLAG_STREAM_ID) {

920 GET_V(*stream_id, tmp < s->nb_streams);

921 }

922 stc = &nut->stream[*stream_id];

923 if (flags & FLAG_CODED_PTS) {

924 int coded_pts = ffio_read_varlen(bc);

925 // FIXME check last_pts validity?

926 if (coded_pts < (1 << stc->msb_pts_shift)) {

927 *pts = ff_lsb2full(stc, coded_pts);

928 } else

929 *pts = coded_pts - (1LL << stc->msb_pts_shift);

930 } else

931 *pts = stc->last_pts + pts_delta;

932 if (flags & FLAG_SIZE_MSB)

933 size += size_mul * ffio_read_varlen(bc);

934 if (flags & FLAG_MATCH_TIME)

935 get_s(bc);

936 if (flags & FLAG_HEADER_IDX)

937 *header_idx = ffio_read_varlen(bc);

938 if (flags & FLAG_RESERVED)

939 reserved_count = ffio_read_varlen(bc);

940 for (i = 0; i < reserved_count; i++)

941 ffio_read_varlen(bc);

942

943 if (*header_idx >= (unsigned)nut->header_count) {

944 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");

945 return AVERROR_INVALIDDATA;

946 }

947 if (size > 4096)

948 *header_idx = 0;

949 size -= nut->header_len[*header_idx];

950

951 if (flags & FLAG_CHECKSUM) {

952 avio_rb32(bc); // FIXME check this

953 } else if (size > 2 * nut->max_distance || FFABS(stc->last_pts - *pts) >

954 stc->max_pts_distance) {

955 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");

956 return AVERROR_INVALIDDATA;

957 }

958

959 stc->last_pts = *pts;

960 stc->last_flags = flags;

961

962 return size;

963 }

964

965 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)

966 {

967 AVFormatContext *s = nut->avf;

968 AVIOContext *bc = s->pb;

969 int size, stream_id, discard;

970 int64_t pts, last_IP_pts;

971 StreamContext *stc;

972 uint8_t header_idx;

973 int ret;

974

975 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);

976 if (size < 0)

977 return size;

978

979 stc = &nut->stream[stream_id];

980

981 if (stc->last_flags & FLAG_KEY)

982 stc->skip_until_key_frame = 0;

983

984 discard = s->streams[stream_id]->discard;

985 last_IP_pts = s->streams[stream_id]->last_IP_pts;

986 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||

987 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&

988 last_IP_pts > pts) ||

989 discard >= AVDISCARD_ALL ||

990 stc->skip_until_key_frame) {

991 avio_skip(bc, size);

992 return 1;

993 }

994

995 if (av_new_packet(pkt, size + nut->header_len[header_idx]) < 0)

996 return AVERROR(ENOMEM);

997 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);

998 pkt->pos = avio_tell(bc); // FIXME

999 if (stc->last_flags & FLAG_SM_DATA) {

1000 int sm_size;

1001 if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0)

1002 return AVERROR_INVALIDDATA;

1003 if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0)

1004 return AVERROR_INVALIDDATA;

1005 sm_size = avio_tell(bc) - pkt->pos;

1006 size -= sm_size;

1007 pkt->size -= sm_size;

1008 }

1009

1010 ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size);

1011 if (ret != size) {

1012 if (ret < 0)

1013 return ret;

1014 }

1015 av_shrink_packet(pkt, nut->header_len[header_idx] + ret);

1016

1017 pkt->stream_index = stream_id;

1018 if (stc->last_flags & FLAG_KEY)

1019 pkt->flags |= AV_PKT_FLAG_KEY;

1020 pkt->pts = pts;

1021

1022 return 0;

1023 }

1024

1025 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)

1026 {

1027 NUTContext *nut = s->priv_data;

1028 AVIOContext *bc = s->pb;

1029 int i, frame_code = 0, ret, skip;

1030 int64_t ts, back_ptr;

1031

1032 for (;;) {

1033 int64_t pos = avio_tell(bc);

1034 uint64_t tmp = nut->next_startcode;

1035 nut->next_startcode = 0;

1036

1037 if (tmp) {

1038 pos -= 8;

1039 } else {

1040 frame_code = avio_r8(bc);

1041 if (url_feof(bc))

1042 return AVERROR_EOF;

1043 if (frame_code == 'N') {

1044 tmp = frame_code;

1045 for (i = 1; i < 8; i++)

1046 tmp = (tmp << 8) + avio_r8(bc);

1047 }

1048 }

1049 switch (tmp) {

1050 case MAIN_STARTCODE:

1051 case STREAM_STARTCODE:

1052 case INDEX_STARTCODE:

1053 skip = get_packetheader(nut, bc, 0, tmp);

1054 avio_skip(bc, skip);

1055 break;

1056 case INFO_STARTCODE:

1057 if (decode_info_header(nut) < 0)

1058 goto resync;

1059 break;

1060 case SYNCPOINT_STARTCODE:

1061 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)

1062 goto resync;

1063 frame_code = avio_r8(bc);

1064 case 0:

1065 ret = decode_frame(nut, pkt, frame_code);

1066 if (ret == 0)

1067 return 0;

1068 else if (ret == 1) // OK but discard packet

1069 break;

1070 default:

1071 resync:

1072 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);

1073 tmp = find_any_startcode(bc, nut->last_syncpoint_pos + 1);

1074 if (tmp == 0)

1075 return AVERROR_INVALIDDATA;

1076 av_log(s, AV_LOG_DEBUG, "sync\n");

1077 nut->next_startcode = tmp;

1078 }

1079 }

1080 }

1081

1082 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,

1083 int64_t *pos_arg, int64_t pos_limit)

1084 {

1085 NUTContext *nut = s->priv_data;

1086 AVIOContext *bc = s->pb;

1087 int64_t pos, pts, back_ptr;

1088 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",

1089 stream_index, *pos_arg, pos_limit);

1090

1091 pos = *pos_arg;

1092 do {

1093 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;

1094 if (pos < 1) {

1095 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");

1096 return AV_NOPTS_VALUE;

1097 }

1098 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);

1099 *pos_arg = pos - 1;

1100 av_assert0(nut->last_syncpoint_pos == *pos_arg);

1101

1102 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);

1103 if (stream_index == -2)

1104 return back_ptr;

1105 av_assert0(stream_index == -1);

1106 return pts;

1107 }

1108

1109 static int read_seek(AVFormatContext *s, int stream_index,

1110 int64_t pts, int flags)

1111 {

1112 NUTContext *nut = s->priv_data;

1113 AVStream *st = s->streams[stream_index];

1114 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };

1115 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };

1116 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };

1117 int64_t pos, pos2, ts;

1118 int i;

1119

1120 if (st->index_entries) {

1121 int index = av_index_search_timestamp(st, pts, flags);

1122 if (index < 0)

1123 index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD);

1124 if (index < 0)

1125 return -1;

1126

1127 pos2 = st->index_entries[index].pos;

1128 ts = st->index_entries[index].timestamp;

1129 } else {

1130 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,

1131 (void **) next_node);

1132 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",

1133 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,

1134 next_node[1]->ts);

1135 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,

1136 next_node[1]->pos, next_node[1]->pos,

1137 next_node[0]->ts, next_node[1]->ts,

1138 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);

1139

1140 if (!(flags & AVSEEK_FLAG_BACKWARD)) {

1141 dummy.pos = pos + 16;

1142 next_node[1] = &nopts_sp;

1143 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,

1144 (void **) next_node);

1145 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,

1146 next_node[1]->pos, next_node[1]->pos,

1147 next_node[0]->back_ptr, next_node[1]->back_ptr,

1148 flags, &ts, nut_read_timestamp);

1149 if (pos2 >= 0)

1150 pos = pos2;

1151 // FIXME dir but I think it does not matter

1152 }

1153 dummy.pos = pos;

1154 sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,

1155 NULL);

1156

1157 av_assert0(sp);

1158 pos2 = sp->back_ptr - 15;

1159 }

1160 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);

1161 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);

1162 avio_seek(s->pb, pos, SEEK_SET);

1163 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);

1164 if (pos2 > pos || pos2 + 15 < pos)

1165 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");

1166 for (i = 0; i < s->nb_streams; i++)

1167 nut->stream[i].skip_until_key_frame = 1;

1168

1169 return 0;

1170 }

1171

1172 static int nut_read_close(AVFormatContext *s)

1173 {

1174 NUTContext *nut = s->priv_data;

1175 int i;

1176

1177 av_freep(&nut->time_base);

1178 av_freep(&nut->stream);

1179 ff_nut_free_sp(nut);

1180 for (i = 1; i < nut->header_count; i++)

1181 av_freep(&nut->header[i]);

1182

1183 return 0;

1184 }

1185

1186 AVInputFormat ff_nut_demuxer = {

1187 .name = "nut",

1188 .long_name = NULL_IF_CONFIG_SMALL("NUT"),

1189 .flags = AVFMT_SEEK_TO_PTS,

1190 .priv_data_size = sizeof(NUTContext),

1191 .read_probe = nut_probe,

1192 .read_header = nut_read_header,

1193 .read_packet = nut_read_packet,

1194 .read_close = nut_read_close,

1195 .read_seek = read_seek,

1196 .extensions = "nut",

1197 .codec_tag = ff_nut_codec_tags,

1198 };

Generated on Sun Mar 23 2014 23:50:12 for FFmpeg by doxygen 1.8.2