FFmpeg: libavformat/flvdec.c Source File

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libavformat

flvdec.c

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1 /*

2 * FLV demuxer

4 *

5 * This demuxer will generate a 1 byte extradata for VP6F content.

6 * It is composed of:

7 * - upper 4bits: difference between encoded width and visible width

8 * - lower 4bits: difference between encoded height and visible height

9 *

10 * This file is part of FFmpeg.

11 *

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

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

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

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

16 *

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

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

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

20 * Lesser General Public License for more details.

21 *

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

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

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

25 */

27 #include "libavutil/avstring.h"

28 #include "libavutil/channel_layout.h"

29 #include "libavutil/dict.h"

30 #include "libavutil/opt.h"

31 #include "libavutil/intfloat.h"

32 #include "libavutil/mathematics.h"

33 #include "libavcodec/bytestream.h"

34 #include "libavcodec/mpeg4audio.h"

35 #include "avformat.h"

36 #include "internal.h"

37 #include "avio_internal.h"

38 #include "flv.h"

40 #define VALIDATE_INDEX_TS_THRESH 2500

42 typedef struct {

43 const AVClass *class; ///< Class for private options.

44 int trust_metadata; ///< configure streams according onMetaData

45 int wrong_dts; ///< wrong dts due to negative cts

46 uint8_t *new_extradata[FLV_STREAM_TYPE_NB];

47 int new_extradata_size[FLV_STREAM_TYPE_NB];

48 int last_sample_rate;

49 int last_channels;

50 struct {

51 int64_t dts;

52 int64_t pos;

53 } validate_index[2];

54 int validate_next;

55 int validate_count;

56 int searched_for_end;

57 } FLVContext;

59 static int flv_probe(AVProbeData *p)

60 {

61 const uint8_t *d;

63 d = p->buf;

64 if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {

65 return AVPROBE_SCORE_MAX;

66 }

67 return 0;

68 }

70 static AVStream *create_stream(AVFormatContext *s, int codec_type)

71 {

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

73 if (!st)

74 return NULL;

75 st->codec->codec_type = codec_type;

76 if(s->nb_streams>=3 ||( s->nb_streams==2

77 && s->streams[0]->codec->codec_type != AVMEDIA_TYPE_DATA

78 && s->streams[1]->codec->codec_type != AVMEDIA_TYPE_DATA))

79 s->ctx_flags &= ~AVFMTCTX_NOHEADER;

81 avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */

82 return st;

83 }

84 static int flv_same_audio_codec(AVCodecContext *acodec, int flags)

85 {

86 int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;

87 int flv_codecid = flags & FLV_AUDIO_CODECID_MASK;

88 int codec_id;

90 if (!acodec->codec_id && !acodec->codec_tag)

91 return 1;

93 if (acodec->bits_per_coded_sample != bits_per_coded_sample)

94 return 0;

96 switch(flv_codecid) {

97 //no distinction between S16 and S8 PCM codec flags

98 case FLV_CODECID_PCM:

99 codec_id = bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 :

100 #if HAVE_BIGENDIAN

101 AV_CODEC_ID_PCM_S16BE;

102 #else

103 AV_CODEC_ID_PCM_S16LE;

104 #endif

105 return codec_id == acodec->codec_id;

106 case FLV_CODECID_PCM_LE:

107 codec_id = bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : AV_CODEC_ID_PCM_S16LE;

108 return codec_id == acodec->codec_id;

109 case FLV_CODECID_AAC:

110 return acodec->codec_id == AV_CODEC_ID_AAC;

111 case FLV_CODECID_ADPCM:

112 return acodec->codec_id == AV_CODEC_ID_ADPCM_SWF;

113 case FLV_CODECID_SPEEX:

114 return acodec->codec_id == AV_CODEC_ID_SPEEX;

115 case FLV_CODECID_MP3:

116 return acodec->codec_id == AV_CODEC_ID_MP3;

117 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

118 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

119 case FLV_CODECID_NELLYMOSER:

120 return acodec->codec_id == AV_CODEC_ID_NELLYMOSER;

121 case FLV_CODECID_PCM_MULAW:

122 return acodec->sample_rate == 8000 &&

123 acodec->codec_id == AV_CODEC_ID_PCM_MULAW;

124 case FLV_CODECID_PCM_ALAW:

125 return acodec->sample_rate = 8000 &&

126 acodec->codec_id == AV_CODEC_ID_PCM_ALAW;

127 default:

128 return acodec->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);

129 }

130 }

131

132 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, AVCodecContext *acodec, int flv_codecid) {

133 switch(flv_codecid) {

134 //no distinction between S16 and S8 PCM codec flags

135 case FLV_CODECID_PCM:

136 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 :

137 #if HAVE_BIGENDIAN

138 AV_CODEC_ID_PCM_S16BE;

139 #else

140 AV_CODEC_ID_PCM_S16LE;

141 #endif

142 break;

143 case FLV_CODECID_PCM_LE:

144 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : AV_CODEC_ID_PCM_S16LE; break;

145 case FLV_CODECID_AAC : acodec->codec_id = AV_CODEC_ID_AAC; break;

146 case FLV_CODECID_ADPCM: acodec->codec_id = AV_CODEC_ID_ADPCM_SWF; break;

147 case FLV_CODECID_SPEEX:

148 acodec->codec_id = AV_CODEC_ID_SPEEX;

149 acodec->sample_rate = 16000;

150 break;

151 case FLV_CODECID_MP3 : acodec->codec_id = AV_CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;

152 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:

153 acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate

154 acodec->codec_id = AV_CODEC_ID_NELLYMOSER;

155 break;

156 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:

157 acodec->sample_rate = 16000;

158 acodec->codec_id = AV_CODEC_ID_NELLYMOSER;

159 break;

160 case FLV_CODECID_NELLYMOSER:

161 acodec->codec_id = AV_CODEC_ID_NELLYMOSER;

162 break;

163 case FLV_CODECID_PCM_MULAW:

164 acodec->sample_rate = 8000;

165 acodec->codec_id = AV_CODEC_ID_PCM_MULAW;

166 break;

167 case FLV_CODECID_PCM_ALAW:

168 acodec->sample_rate = 8000;

169 acodec->codec_id = AV_CODEC_ID_PCM_ALAW;

170 break;

171 default:

172 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);

173 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;

174 }

175 }

176

177 static int flv_same_video_codec(AVCodecContext *vcodec, int flags)

178 {

179 int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;

180

181 if (!vcodec->codec_id && !vcodec->codec_tag)

182 return 1;

183

184 switch (flv_codecid) {

185 case FLV_CODECID_H263:

186 return vcodec->codec_id == AV_CODEC_ID_FLV1;

187 case FLV_CODECID_SCREEN:

188 return vcodec->codec_id == AV_CODEC_ID_FLASHSV;

189 case FLV_CODECID_SCREEN2:

190 return vcodec->codec_id == AV_CODEC_ID_FLASHSV2;

191 case FLV_CODECID_VP6:

192 return vcodec->codec_id == AV_CODEC_ID_VP6F;

193 case FLV_CODECID_VP6A:

194 return vcodec->codec_id == AV_CODEC_ID_VP6A;

195 case FLV_CODECID_H264:

196 return vcodec->codec_id == AV_CODEC_ID_H264;

197 default:

198 return vcodec->codec_tag == flv_codecid;

199 }

200 }

201

202 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid, int read) {

203 AVCodecContext *vcodec = vstream->codec;

204 switch(flv_codecid) {

205 case FLV_CODECID_H263 : vcodec->codec_id = AV_CODEC_ID_FLV1 ; break;

206 case FLV_CODECID_REALH263: vcodec->codec_id = AV_CODEC_ID_H263 ; break; // Really mean it this time

207 case FLV_CODECID_SCREEN: vcodec->codec_id = AV_CODEC_ID_FLASHSV; break;

208 case FLV_CODECID_SCREEN2: vcodec->codec_id = AV_CODEC_ID_FLASHSV2; break;

209 case FLV_CODECID_VP6 : vcodec->codec_id = AV_CODEC_ID_VP6F ;

210 case FLV_CODECID_VP6A :

211 if(flv_codecid == FLV_CODECID_VP6A)

212 vcodec->codec_id = AV_CODEC_ID_VP6A;

213 if (read) {

214 if (vcodec->extradata_size != 1) {

215 vcodec->extradata = av_malloc(1 + FF_INPUT_BUFFER_PADDING_SIZE);

216 if (vcodec->extradata)

217 vcodec->extradata_size = 1;

218 }

219 if (vcodec->extradata)

220 vcodec->extradata[0] = avio_r8(s->pb);

221 else

222 avio_skip(s->pb, 1);

223 }

224 return 1; // 1 byte body size adjustment for flv_read_packet()

225 case FLV_CODECID_H264:

226 vcodec->codec_id = AV_CODEC_ID_H264;

227 return 3; // not 4, reading packet type will consume one byte

228 case FLV_CODECID_MPEG4:

229 vcodec->codec_id = AV_CODEC_ID_MPEG4;

230 return 3;

231 default:

232 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);

233 vcodec->codec_tag = flv_codecid;

234 }

235

236 return 0;

237 }

238

239 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) {

240 int length = avio_rb16(ioc);

241 if(length >= buffsize) {

242 avio_skip(ioc, length);

243 return -1;

244 }

245

246 avio_read(ioc, buffer, length);

247

248 buffer[length] = '0円';

249

250 return length;

251 }

252

253 static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) {

254 FLVContext *flv = s->priv_data;

255 unsigned int timeslen = 0, fileposlen = 0, i;

256 char str_val[256];

257 int64_t *times = NULL;

258 int64_t *filepositions = NULL;

259 int ret = AVERROR(ENOSYS);

260 int64_t initial_pos = avio_tell(ioc);

261

262 if(vstream->nb_index_entries>0){

263 av_log(s, AV_LOG_WARNING, "Skiping duplicate index\n");

264 return 0;

265 }

266

267 if (s->flags & AVFMT_FLAG_IGNIDX)

268 return 0;

269

270 while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {

271 int64_t** current_array;

272 unsigned int arraylen;

273

274 // Expect array object in context

275 if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)

276 break;

277

278 arraylen = avio_rb32(ioc);

279 if(arraylen>>28)

280 break;

281

282 if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times){

283 current_array= ×

284 timeslen= arraylen;

285 }else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions){

286 current_array= &filepositions;

287 fileposlen= arraylen;

288 }else // unexpected metatag inside keyframes, will not use such metadata for indexing

289 break;

290

291 if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {

292 ret = AVERROR(ENOMEM);

293 goto finish;

294 }

295

296 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {

297 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)

298 goto invalid;

299 current_array[0][i] = av_int2double(avio_rb64(ioc));

300 }

301 if (times && filepositions) {

302 // All done, exiting at a position allowing amf_parse_object

303 // to finish parsing the object

304 ret = 0;

305 break;

306 }

307 }

308

309 if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {

310 for (i = 0; i < fileposlen; i++) {

311 av_add_index_entry(vstream, filepositions[i], times[i]*1000,

312 0, 0, AVINDEX_KEYFRAME);

313 if (i < 2) {

314 flv->validate_index[i].pos = filepositions[i];

315 flv->validate_index[i].dts = times[i] * 1000;

316 flv->validate_count = i + 1;

317 }

318 }

319 } else {

320 invalid:

321 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");

322 }

323

324 finish:

325 av_freep(&times);

326 av_freep(&filepositions);

327 avio_seek(ioc, initial_pos, SEEK_SET);

328 return ret;

329 }

330

331 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {

332 AVCodecContext *acodec, *vcodec;

333 FLVContext *flv = s->priv_data;

334 AVIOContext *ioc;

335 AMFDataType amf_type;

336 char str_val[256];

337 double num_val;

338

339 num_val = 0;

340 ioc = s->pb;

341

342 amf_type = avio_r8(ioc);

343

344 switch(amf_type) {

345 case AMF_DATA_TYPE_NUMBER:

346 num_val = av_int2double(avio_rb64(ioc)); break;

347 case AMF_DATA_TYPE_BOOL:

348 num_val = avio_r8(ioc); break;

349 case AMF_DATA_TYPE_STRING:

350 if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)

351 return -1;

352 break;

353 case AMF_DATA_TYPE_OBJECT:

354 if ((vstream || astream) && ioc->seekable && key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)

355 if (parse_keyframes_index(s, ioc, vstream ? vstream : astream,

356 max_pos) < 0)

357 av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");

358

359 while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {

360 if (amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)

361 return -1; //if we couldn't skip, bomb out.

362 }

363 if(avio_r8(ioc) != AMF_END_OF_OBJECT)

364 return -1;

365 break;

366 case AMF_DATA_TYPE_NULL:

367 case AMF_DATA_TYPE_UNDEFINED:

368 case AMF_DATA_TYPE_UNSUPPORTED:

369 break; //these take up no additional space

370 case AMF_DATA_TYPE_MIXEDARRAY:

371 avio_skip(ioc, 4); //skip 32-bit max array index

372 while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {

373 //this is the only case in which we would want a nested parse to not skip over the object

374 if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)

375 return -1;

376 }

377 if(avio_r8(ioc) != AMF_END_OF_OBJECT)

378 return -1;

379 break;

380 case AMF_DATA_TYPE_ARRAY: {

381 unsigned int arraylen, i;

382

383 arraylen = avio_rb32(ioc);

384 for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {

385 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)

386 return -1; //if we couldn't skip, bomb out.

387 }

388 }

389 break;

390 case AMF_DATA_TYPE_DATE:

391 avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)

392 break;

393 default: //unsupported type, we couldn't skip

394 return -1;

395 }

396

397 if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL

398 acodec = astream ? astream->codec : NULL;

399 vcodec = vstream ? vstream->codec : NULL;

400

401 if (amf_type == AMF_DATA_TYPE_NUMBER || amf_type == AMF_DATA_TYPE_BOOL) {

402 if (!strcmp(key, "duration"))

403 s->duration = num_val * AV_TIME_BASE;

404 else if (!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))

405 vcodec->bit_rate = num_val * 1024.0;

406 else if (!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))

407 acodec->bit_rate = num_val * 1024.0;

408 else if (!strcmp(key, "datastream")) {

409 AVStream *st = create_stream(s, AVMEDIA_TYPE_DATA);

410 if (!st)

411 return AVERROR(ENOMEM);

412 st->codec->codec_id = AV_CODEC_ID_TEXT;

413 } else if (flv->trust_metadata) {

414 if (!strcmp(key, "videocodecid") && vcodec) {

415 flv_set_video_codec(s, vstream, num_val, 0);

416 } else

417 if (!strcmp(key, "audiocodecid") && acodec) {

418 int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET;

419 flv_set_audio_codec(s, astream, acodec, id);

420 } else

421 if (!strcmp(key, "audiosamplerate") && acodec) {

422 acodec->sample_rate = num_val;

423 } else if (!strcmp(key, "audiosamplesize") && acodec) {

424 acodec->bits_per_coded_sample = num_val;

425 } else if (!strcmp(key, "stereo") && acodec) {

426 acodec->channels = num_val + 1;

427 acodec->channel_layout = acodec->channels == 2 ?

428 AV_CH_LAYOUT_STEREO :

429 AV_CH_LAYOUT_MONO;

430 } else

431 if (!strcmp(key, "width") && vcodec) {

432 vcodec->width = num_val;

433 } else

434 if (!strcmp(key, "height") && vcodec) {

435 vcodec->height = num_val;

436 }

437 }

438 }

439

440 if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 &&

441 ((!acodec && !strcmp(key, "audiocodecid")) ||

442 (!vcodec && !strcmp(key, "videocodecid"))))

443 s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object

444

445 if (!strcmp(key, "duration") ||

446 !strcmp(key, "filesize") ||

447 !strcmp(key, "width") ||

448 !strcmp(key, "height") ||

449 !strcmp(key, "videodatarate") ||

450 !strcmp(key, "framerate") ||

451 !strcmp(key, "videocodecid") ||

452 !strcmp(key, "audiodatarate") ||

453 !strcmp(key, "audiosamplerate") ||

454 !strcmp(key, "audiosamplesize") ||

455 !strcmp(key, "stereo") ||

456 !strcmp(key, "audiocodecid"))

457 return 0;

458

459 if(amf_type == AMF_DATA_TYPE_BOOL) {

460 av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val));

461 av_dict_set(&s->metadata, key, str_val, 0);

462 } else if(amf_type == AMF_DATA_TYPE_NUMBER) {

463 snprintf(str_val, sizeof(str_val), "%.f", num_val);

464 av_dict_set(&s->metadata, key, str_val, 0);

465 } else if (amf_type == AMF_DATA_TYPE_STRING)

466 av_dict_set(&s->metadata, key, str_val, 0);

467 }

468

469 return 0;

470 }

471

472 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {

473 AMFDataType type;

474 AVStream *stream, *astream, *vstream, *dstream;

475 AVIOContext *ioc;

476 int i;

477 char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.

478

479 vstream = astream = dstream = NULL;

480 ioc = s->pb;

481

482 //first object needs to be "onMetaData" string

483 type = avio_r8(ioc);

484 if (type != AMF_DATA_TYPE_STRING ||

485 amf_get_string(ioc, buffer, sizeof(buffer)) < 0)

486 return -1;

487

488 if (!strcmp(buffer, "onTextData"))

489 return 1;

490

491 if (strcmp(buffer, "onMetaData"))

492 return -1;

493

494 //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.

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

496 stream = s->streams[i];

497 if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream;

498 else if(stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;

499 else if(stream->codec->codec_type == AVMEDIA_TYPE_DATA) dstream = stream;

500 }

501

502 //parse the second object (we want a mixed array)

503 if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)

504 return -1;

505

506 return 0;

507 }

508

509 static int flv_read_header(AVFormatContext *s)

510 {

511 int offset, flags;

512

513 avio_skip(s->pb, 4);

514 flags = avio_r8(s->pb);

515 /* old flvtool cleared this field */

516 /* FIXME: better fix needed */

517 if (!flags) {

518 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;

519 av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");

520 }

521

522 s->ctx_flags |= AVFMTCTX_NOHEADER;

523

524 if(flags & FLV_HEADER_FLAG_HASVIDEO){

525 if(!create_stream(s, AVMEDIA_TYPE_VIDEO))

526 return AVERROR(ENOMEM);

527 }

528 if(flags & FLV_HEADER_FLAG_HASAUDIO){

529 if(!create_stream(s, AVMEDIA_TYPE_AUDIO))

530 return AVERROR(ENOMEM);

531 }

532 // Flag doesn't indicate whether or not there is script-data present. Must

533 // create that stream if it's encountered.

534

535 offset = avio_rb32(s->pb);

536 avio_seek(s->pb, offset, SEEK_SET);

537 avio_skip(s->pb, 4);

538

539 s->start_time = 0;

540

541 return 0;

542 }

543

544 static int flv_read_close(AVFormatContext *s)

545 {

546 int i;

547 FLVContext *flv = s->priv_data;

548 for(i=0; i<FLV_STREAM_TYPE_NB; i++)

549 av_freep(&flv->new_extradata[i]);

550 return 0;

551 }

552

553 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)

554 {

555 av_free(st->codec->extradata);

556 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);

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

558 return AVERROR(ENOMEM);

559 st->codec->extradata_size = size;

560 avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);

561 return 0;

562 }

563

564 static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,

565 int size)

566 {

567 av_free(flv->new_extradata[stream]);

568 flv->new_extradata[stream] = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);

569 if (!flv->new_extradata[stream])

570 return AVERROR(ENOMEM);

571 flv->new_extradata_size[stream] = size;

572 avio_read(pb, flv->new_extradata[stream], size);

573 return 0;

574 }

575

576 static void clear_index_entries(AVFormatContext *s, int64_t pos)

577 {

578 int i, j, out;

579 av_log(s, AV_LOG_WARNING, "Found invalid index entries, clearing the index.\n");

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

581 AVStream *st = s->streams[i];

582 /* Remove all index entries that point to >= pos */

583 out = 0;

584 for (j = 0; j < st->nb_index_entries; j++) {

585 if (st->index_entries[j].pos < pos)

586 st->index_entries[out++] = st->index_entries[j];

587 }

588 st->nb_index_entries = out;

589 }

590 }

591

592

593 static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,

594 int64_t dts, int64_t next)

595 {

596 int ret = AVERROR_INVALIDDATA, i;

597 AVIOContext *pb = s->pb;

598 AVStream *st = NULL;

599 AMFDataType type;

600 char buf[20];

601 int length;

602

603 type = avio_r8(pb);

604 if (type == AMF_DATA_TYPE_MIXEDARRAY)

605 avio_seek(pb, 4, SEEK_CUR);

606 else if (type != AMF_DATA_TYPE_OBJECT)

607 goto out;

608

609 amf_get_string(pb, buf, sizeof(buf));

610 if (strcmp(buf, "type") || avio_r8(pb) != AMF_DATA_TYPE_STRING)

611 goto out;

612

613 amf_get_string(pb, buf, sizeof(buf));

614 //FIXME parse it as codec_id

615 amf_get_string(pb, buf, sizeof(buf));

616 if (strcmp(buf, "text") || avio_r8(pb) != AMF_DATA_TYPE_STRING)

617 goto out;

618

619 length = avio_rb16(pb);

620 ret = av_get_packet(s->pb, pkt, length);

621 if (ret < 0) {

622 ret = AVERROR(EIO);

623 goto out;

624 }

625

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

627 st = s->streams[i];

628 if (st->codec->codec_type == AVMEDIA_TYPE_DATA)

629 break;

630 }

631

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

633 st = create_stream(s, AVMEDIA_TYPE_DATA);

634 if (!st)

635 goto out;

636 st->codec->codec_id = AV_CODEC_ID_TEXT;

637 }

638

639 pkt->dts = dts;

640 pkt->pts = dts;

641 pkt->size = ret;

642

643 pkt->stream_index = st->index;

644 pkt->flags |= AV_PKT_FLAG_KEY;

645

646 avio_seek(s->pb, next + 4, SEEK_SET);

647 out:

648 return ret;

649 }

650

651 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)

652 {

653 FLVContext *flv = s->priv_data;

654 int ret, i, type, size, flags;

655 int stream_type=-1;

656 int64_t next, pos, meta_pos;

657 int64_t dts, pts = AV_NOPTS_VALUE;

658 int av_uninit(channels);

659 int av_uninit(sample_rate);

660 AVStream *st = NULL;

661

662 for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */

663 pos = avio_tell(s->pb);

664 type = avio_r8(s->pb);

665 size = avio_rb24(s->pb);

666 dts = avio_rb24(s->pb);

667 dts |= avio_r8(s->pb) << 24;

668 av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts);

669 if (url_feof(s->pb))

670 return AVERROR_EOF;

671 avio_skip(s->pb, 3); /* stream id, always 0 */

672 flags = 0;

673

674 if (flv->validate_next < flv->validate_count) {

675 int64_t validate_pos = flv->validate_index[flv->validate_next].pos;

676 if (pos == validate_pos) {

677 if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=

678 VALIDATE_INDEX_TS_THRESH) {

679 flv->validate_next++;

680 } else {

681 clear_index_entries(s, validate_pos);

682 flv->validate_count = 0;

683 }

684 } else if (pos > validate_pos) {

685 clear_index_entries(s, validate_pos);

686 flv->validate_count = 0;

687 }

688 }

689

690 if(size == 0)

691 continue;

692

693 next= size + avio_tell(s->pb);

694

695 if (type == FLV_TAG_TYPE_AUDIO) {

696 stream_type=FLV_STREAM_TYPE_AUDIO;

697 flags = avio_r8(s->pb);

698 size--;

699 } else if (type == FLV_TAG_TYPE_VIDEO) {

700 stream_type=FLV_STREAM_TYPE_VIDEO;

701 flags = avio_r8(s->pb);

702 size--;

703 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD)

704 goto skip;

705 } else if (type == FLV_TAG_TYPE_META) {

706 stream_type=FLV_STREAM_TYPE_DATA;

707 if (size > 13+1+4 && dts == 0) { // Header-type metadata stuff

708 meta_pos = avio_tell(s->pb);

709 if (flv_read_metabody(s, next) == 0){

710 goto skip;

711 }

712 avio_seek(s->pb, meta_pos, SEEK_SET);

713 }

714 } else {

715 av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);

716 skip:

717 avio_seek(s->pb, next, SEEK_SET);

718 continue;

719 }

720

721 /* skip empty data packets */

722 if (!size)

723 continue;

724

725 /* now find stream */

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

727 st = s->streams[i];

728 if (stream_type == FLV_STREAM_TYPE_AUDIO) {

729 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&

730 (s->audio_codec_id || flv_same_audio_codec(st->codec, flags))) {

731 break;

732 }

733 } else

734 if (stream_type == FLV_STREAM_TYPE_VIDEO) {

735 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&

736 (s->video_codec_id || flv_same_video_codec(st->codec, flags))) {

737 break;

738 }

739 } else if (stream_type == FLV_STREAM_TYPE_DATA) {

740 if (st->codec->codec_type == AVMEDIA_TYPE_DATA)

741 break;

742 }

743 }

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

745 static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_DATA};

746 av_log(s, AV_LOG_WARNING, "Stream discovered after head already parsed\n");

747 st = create_stream(s,

748 stream_types[stream_type]);

749 if (!st)

750 return AVERROR(ENOMEM);

751

752 }

753 av_dlog(s, "%d %X %d \n", stream_type, flags, st->discard);

754 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))

755 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))

756 || st->discard >= AVDISCARD_ALL

757 ){

758 avio_seek(s->pb, next, SEEK_SET);

759 continue;

760 }

761 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || stream_type == FLV_STREAM_TYPE_AUDIO)

762 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);

763 break;

764 }

765

766 // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps

767 if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE) && !flv->searched_for_end){

768 int size;

769 const int64_t pos= avio_tell(s->pb);

770 int64_t fsize= avio_size(s->pb);

771 retry_duration:

772 avio_seek(s->pb, fsize-4, SEEK_SET);

773 size= avio_rb32(s->pb);

774 avio_seek(s->pb, fsize-3-size, SEEK_SET);

775 if(size == avio_rb24(s->pb) + 11){

776 uint32_t ts = avio_rb24(s->pb);

777 ts |= avio_r8(s->pb) << 24;

778 if(ts)

779 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;

780 else if (fsize >= 8 && fsize - 8 >= size){

781 fsize -= size+4;

782 goto retry_duration;

783 }

784 }

785

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

787 flv->searched_for_end = 1;

788 }

789

790 if(stream_type == FLV_STREAM_TYPE_AUDIO){

791 int bits_per_coded_sample;

792 channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;

793 sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);

794 bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;

795 if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {

796 st->codec->channels = channels;

797 st->codec->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :

798 AV_CH_LAYOUT_STEREO;

799 st->codec->sample_rate = sample_rate;

800 st->codec->bits_per_coded_sample = bits_per_coded_sample;

801 }

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

803 flv_set_audio_codec(s, st, st->codec, flags & FLV_AUDIO_CODECID_MASK);

804 flv->last_sample_rate = sample_rate = st->codec->sample_rate;

805 flv->last_channels = channels = st->codec->channels;

806 } else {

807 AVCodecContext ctx;

808 ctx.sample_rate = sample_rate;

809 flv_set_audio_codec(s, st, &ctx, flags & FLV_AUDIO_CODECID_MASK);

810 sample_rate = ctx.sample_rate;

811 }

812 } else if(stream_type == FLV_STREAM_TYPE_VIDEO) {

813 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);

814 }

815

816 if (st->codec->codec_id == AV_CODEC_ID_AAC ||

817 st->codec->codec_id == AV_CODEC_ID_H264 ||

818 st->codec->codec_id == AV_CODEC_ID_MPEG4) {

819 int type = avio_r8(s->pb);

820 size--;

821 if (st->codec->codec_id == AV_CODEC_ID_H264 || st->codec->codec_id == AV_CODEC_ID_MPEG4) {

822 int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension

823 pts = dts + cts;

824 if (cts < 0) { // dts are wrong

825 flv->wrong_dts = 1;

826 av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");

827 }

828 if (flv->wrong_dts)

829 dts = AV_NOPTS_VALUE;

830 }

831 if (type == 0 && (!st->codec->extradata || st->codec->codec_id == AV_CODEC_ID_AAC)) {

832 if (st->codec->extradata) {

833 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)

834 return ret;

835 ret = AVERROR(EAGAIN);

836 goto leave;

837 }

838 if ((ret = flv_get_extradata(s, st, size)) < 0)

839 return ret;

840 if (st->codec->codec_id == AV_CODEC_ID_AAC && 0) {

841 MPEG4AudioConfig cfg;

842 if (avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,

843 st->codec->extradata_size * 8, 1) >= 0) {

844 st->codec->channels = cfg.channels;

845 st->codec->channel_layout = 0;

846 if (cfg.ext_sample_rate)

847 st->codec->sample_rate = cfg.ext_sample_rate;

848 else

849 st->codec->sample_rate = cfg.sample_rate;

850 av_dlog(s, "mp4a config channels %d sample rate %d\n",

851 st->codec->channels, st->codec->sample_rate);

852 }

853 }

854

855 ret = AVERROR(EAGAIN);

856 goto leave;

857 }

858 }

859

860 /* skip empty data packets */

861 if (!size) {

862 ret = AVERROR(EAGAIN);

863 goto leave;

864 }

865

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

867 if (ret < 0)

868 return ret;

869 pkt->dts = dts;

870 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;

871 pkt->stream_index = st->index;

872 if (flv->new_extradata[stream_type]) {

873 uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,

874 flv->new_extradata_size[stream_type]);

875 if (side) {

876 memcpy(side, flv->new_extradata[stream_type],

877 flv->new_extradata_size[stream_type]);

878 av_freep(&flv->new_extradata[stream_type]);

879 flv->new_extradata_size[stream_type] = 0;

880 }

881 }

882 if (stream_type == FLV_STREAM_TYPE_AUDIO && (sample_rate != flv->last_sample_rate ||

883 channels != flv->last_channels)) {

884 flv->last_sample_rate = sample_rate;

885 flv->last_channels = channels;

886 ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);

887 }

888

889 if ( stream_type == FLV_STREAM_TYPE_AUDIO ||

890 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||

891 stream_type == FLV_STREAM_TYPE_DATA)

892 pkt->flags |= AV_PKT_FLAG_KEY;

893

894 leave:

895 avio_skip(s->pb, 4);

896 return ret;

897 }

898

899 static int flv_read_seek(AVFormatContext *s, int stream_index,

900 int64_t ts, int flags)

901 {

902 FLVContext *flv = s->priv_data;

903 flv->validate_count = 0;

904 return avio_seek_time(s->pb, stream_index, ts, flags);

905 }

906

907 #define OFFSET(x) offsetof(FLVContext, x)

908 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM

909 static const AVOption options[] = {

910 { "flv_metadata", "Allocate streams according the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD},

911 { NULL }

912 };

913

914 static const AVClass flv_class = {

915 .class_name = "flvdec",

916 .item_name = av_default_item_name,

917 .option = options,

918 .version = LIBAVUTIL_VERSION_INT,

919 };

920

921 AVInputFormat ff_flv_demuxer = {

922 .name = "flv",

923 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),

924 .priv_data_size = sizeof(FLVContext),

925 .read_probe = flv_probe,

926 .read_header = flv_read_header,

927 .read_packet = flv_read_packet,

928 .read_seek = flv_read_seek,

929 .read_close = flv_read_close,

930 .extensions = "flv",

931 .priv_class = &flv_class,

932 };

Generated on Wed Jul 10 2013 23:47:58 for FFmpeg by doxygen 1.8.2