FFmpeg: libavformat/rtmppkt.c Source File

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libavformat

rtmppkt.c

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1 /*

2 * RTMP input format

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 "libavcodec/bytestream.h"

23 #include "libavutil/avstring.h"

24 #include "libavutil/intfloat.h"

25 #include "avformat.h"

27 #include "rtmppkt.h"

28 #include "flv.h"

29 #include "url.h"

31 void ff_amf_write_bool(uint8_t **dst, int val)

32 {

33 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL);

34 bytestream_put_byte(dst, val);

35 }

37 void ff_amf_write_number(uint8_t **dst, double val)

38 {

39 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER);

40 bytestream_put_be64(dst, av_double2int(val));

41 }

43 void ff_amf_write_string(uint8_t **dst, const char *str)

44 {

45 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);

46 bytestream_put_be16(dst, strlen(str));

47 bytestream_put_buffer(dst, str, strlen(str));

48 }

50 void ff_amf_write_string2(uint8_t **dst, const char *str1, const char *str2)

51 {

52 int len1 = 0, len2 = 0;

53 if (str1)

54 len1 = strlen(str1);

55 if (str2)

56 len2 = strlen(str2);

57 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);

58 bytestream_put_be16(dst, len1 + len2);

59 bytestream_put_buffer(dst, str1, len1);

60 bytestream_put_buffer(dst, str2, len2);

61 }

63 void ff_amf_write_null(uint8_t **dst)

64 {

65 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);

66 }

68 void ff_amf_write_object_start(uint8_t **dst)

69 {

70 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);

71 }

73 void ff_amf_write_field_name(uint8_t **dst, const char *str)

74 {

75 bytestream_put_be16(dst, strlen(str));

76 bytestream_put_buffer(dst, str, strlen(str));

77 }

79 void ff_amf_write_object_end(uint8_t **dst)

80 {

81 /* first two bytes are field name length = 0,

82 * AMF object should end with it and end marker

83 */

84 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);

85 }

87 int ff_amf_read_bool(GetByteContext *bc, int *val)

88 {

89 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_BOOL)

90 return AVERROR_INVALIDDATA;

91 *val = bytestream2_get_byte(bc);

92 return 0;

93 }

95 int ff_amf_read_number(GetByteContext *bc, double *val)

96 {

97 uint64_t read;

98 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NUMBER)

99 return AVERROR_INVALIDDATA;

100 read = bytestream2_get_be64(bc);

101 *val = av_int2double(read);

102 return 0;

103 }

104

105 int ff_amf_read_string(GetByteContext *bc, uint8_t *str,

106 int strsize, int *length)

107 {

108 int stringlen = 0;

109 int readsize;

110 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_STRING)

111 return AVERROR_INVALIDDATA;

112 stringlen = bytestream2_get_be16(bc);

113 if (stringlen + 1 > strsize)

114 return AVERROR(EINVAL);

115 readsize = bytestream2_get_buffer(bc, str, stringlen);

116 if (readsize != stringlen) {

117 av_log(NULL, AV_LOG_WARNING,

118 "Unable to read as many bytes as AMF string signaled\n");

119 }

120 str[readsize] = '0円';

121 *length = FFMIN(stringlen, readsize);

122 return 0;

123 }

124

125 int ff_amf_read_null(GetByteContext *bc)

126 {

127 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NULL)

128 return AVERROR_INVALIDDATA;

129 return 0;

130 }

131

132 int ff_rtmp_check_alloc_array(RTMPPacket **prev_pkt, int *nb_prev_pkt,

133 int channel)

134 {

135 int nb_alloc;

136 RTMPPacket *ptr;

137 if (channel < *nb_prev_pkt)

138 return 0;

139

140 nb_alloc = channel + 16;

141 // This can't use the av_reallocp family of functions, since we

142 // would need to free each element in the array before the array

143 // itself is freed.

144 ptr = av_realloc_array(*prev_pkt, nb_alloc, sizeof(**prev_pkt));

145 if (!ptr)

146 return AVERROR(ENOMEM);

147 memset(ptr + *nb_prev_pkt, 0, (nb_alloc - *nb_prev_pkt) * sizeof(*ptr));

148 *prev_pkt = ptr;

149 *nb_prev_pkt = nb_alloc;

150 return 0;

151 }

152

153 int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,

154 int chunk_size, RTMPPacket **prev_pkt, int *nb_prev_pkt)

155 {

156 uint8_t hdr;

157

158 if (ffurl_read(h, &hdr, 1) != 1)

159 return AVERROR(EIO);

160

161 return ff_rtmp_packet_read_internal(h, p, chunk_size, prev_pkt,

162 nb_prev_pkt, hdr);

163 }

164

165 static int rtmp_packet_read_one_chunk(URLContext *h, RTMPPacket *p,

166 int chunk_size, RTMPPacket **prev_pkt_ptr,

167 int *nb_prev_pkt, uint8_t hdr)

168 {

169

170 uint8_t buf[16];

171 int channel_id, timestamp, size;

172 uint32_t extra = 0;

173 enum RTMPPacketType type;

174 int written = 0;

175 int ret, toread;

176 RTMPPacket *prev_pkt;

177

178 written++;

179 channel_id = hdr & 0x3F;

180

181 if (channel_id < 2) { //special case for channel number >= 64

182 buf[1] = 0;

183 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)

184 return AVERROR(EIO);

185 written += channel_id + 1;

186 channel_id = AV_RL16(buf) + 64;

187 }

188 if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,

189 channel_id)) < 0)

190 return ret;

191 prev_pkt = *prev_pkt_ptr;

192 size = prev_pkt[channel_id].size;

193 type = prev_pkt[channel_id].type;

194 extra = prev_pkt[channel_id].extra;

195

196 hdr >>= 6;

197 if (hdr == RTMP_PS_ONEBYTE) {

198 timestamp = prev_pkt[channel_id].ts_delta;

199 } else {

200 if (ffurl_read_complete(h, buf, 3) != 3)

201 return AVERROR(EIO);

202 written += 3;

203 timestamp = AV_RB24(buf);

204 if (hdr != RTMP_PS_FOURBYTES) {

205 if (ffurl_read_complete(h, buf, 3) != 3)

206 return AVERROR(EIO);

207 written += 3;

208 size = AV_RB24(buf);

209 if (ffurl_read_complete(h, buf, 1) != 1)

210 return AVERROR(EIO);

211 written++;

212 type = buf[0];

213 if (hdr == RTMP_PS_TWELVEBYTES) {

214 if (ffurl_read_complete(h, buf, 4) != 4)

215 return AVERROR(EIO);

216 written += 4;

217 extra = AV_RL32(buf);

218 }

219 }

220 if (timestamp == 0xFFFFFF) {

221 if (ffurl_read_complete(h, buf, 4) != 4)

222 return AVERROR(EIO);

223 timestamp = AV_RB32(buf);

224 }

225 }

226 if (hdr != RTMP_PS_TWELVEBYTES)

227 timestamp += prev_pkt[channel_id].timestamp;

228

229 if (!prev_pkt[channel_id].read) {

230 if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,

231 size)) < 0)

232 return ret;

233 p->read = written;

234 p->offset = 0;

235 prev_pkt[channel_id].ts_delta = timestamp -

236 prev_pkt[channel_id].timestamp;

237 prev_pkt[channel_id].timestamp = timestamp;

238 } else {

239 // previous packet in this channel hasn't completed reading

240 RTMPPacket *prev = &prev_pkt[channel_id];

241 p->data = prev->data;

242 p->size = prev->size;

243 p->channel_id = prev->channel_id;

244 p->type = prev->type;

245 p->ts_delta = prev->ts_delta;

246 p->extra = prev->extra;

247 p->offset = prev->offset;

248 p->read = prev->read + written;

249 p->timestamp = prev->timestamp;

250 prev->data = NULL;

251 }

252 p->extra = extra;

253 // save history

254 prev_pkt[channel_id].channel_id = channel_id;

255 prev_pkt[channel_id].type = type;

256 prev_pkt[channel_id].size = size;

257 prev_pkt[channel_id].extra = extra;

258 size = size - p->offset;

259

260 toread = FFMIN(size, chunk_size);

261 if (ffurl_read_complete(h, p->data + p->offset, toread) != toread) {

262 ff_rtmp_packet_destroy(p);

263 return AVERROR(EIO);

264 }

265 size -= toread;

266 p->read += toread;

267 p->offset += toread;

268

269 if (size > 0) {

270 RTMPPacket *prev = &prev_pkt[channel_id];

271 prev->data = p->data;

272 prev->read = p->read;

273 prev->offset = p->offset;

274 return AVERROR(EAGAIN);

275 }

276

277 prev_pkt[channel_id].read = 0; // read complete; reset if needed

278 return p->read;

279 }

280

281 int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,

282 RTMPPacket **prev_pkt, int *nb_prev_pkt,

283 uint8_t hdr)

284 {

285 while (1) {

286 int ret = rtmp_packet_read_one_chunk(h, p, chunk_size, prev_pkt,

287 nb_prev_pkt, hdr);

288 if (ret > 0 || ret != AVERROR(EAGAIN))

289 return ret;

290

291 if (ffurl_read(h, &hdr, 1) != 1)

292 return AVERROR(EIO);

293 }

294 }

295

296 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,

297 int chunk_size, RTMPPacket **prev_pkt_ptr,

298 int *nb_prev_pkt)

299 {

300 uint8_t pkt_hdr[16], *p = pkt_hdr;

301 int mode = RTMP_PS_TWELVEBYTES;

302 int off = 0;

303 int written = 0;

304 int ret;

305 RTMPPacket *prev_pkt;

306

307 if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,

308 pkt->channel_id)) < 0)

309 return ret;

310 prev_pkt = *prev_pkt_ptr;

311

312 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp;

313

314 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.

315 if (prev_pkt[pkt->channel_id].channel_id &&

316 pkt->extra == prev_pkt[pkt->channel_id].extra) {

317 if (pkt->type == prev_pkt[pkt->channel_id].type &&

318 pkt->size == prev_pkt[pkt->channel_id].size) {

319 mode = RTMP_PS_FOURBYTES;

320 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta)

321 mode = RTMP_PS_ONEBYTE;

322 } else {

323 mode = RTMP_PS_EIGHTBYTES;

324 }

325 }

326

327 if (pkt->channel_id < 64) {

328 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));

329 } else if (pkt->channel_id < 64 + 256) {

330 bytestream_put_byte(&p, 0 | (mode << 6));

331 bytestream_put_byte(&p, pkt->channel_id - 64);

332 } else {

333 bytestream_put_byte(&p, 1 | (mode << 6));

334 bytestream_put_le16(&p, pkt->channel_id - 64);

335 }

336 if (mode != RTMP_PS_ONEBYTE) {

337 uint32_t timestamp = pkt->timestamp;

338 if (mode != RTMP_PS_TWELVEBYTES)

339 timestamp = pkt->ts_delta;

340 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp);

341 if (mode != RTMP_PS_FOURBYTES) {

342 bytestream_put_be24(&p, pkt->size);

343 bytestream_put_byte(&p, pkt->type);

344 if (mode == RTMP_PS_TWELVEBYTES)

345 bytestream_put_le32(&p, pkt->extra);

346 }

347 if (timestamp >= 0xFFFFFF)

348 bytestream_put_be32(&p, timestamp);

349 }

350 // save history

351 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;

352 prev_pkt[pkt->channel_id].type = pkt->type;

353 prev_pkt[pkt->channel_id].size = pkt->size;

354 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;

355 if (mode != RTMP_PS_TWELVEBYTES) {

356 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta;

357 } else {

358 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp;

359 }

360 prev_pkt[pkt->channel_id].extra = pkt->extra;

361

362 if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)

363 return ret;

364 written = p - pkt_hdr + pkt->size;

365 while (off < pkt->size) {

366 int towrite = FFMIN(chunk_size, pkt->size - off);

367 if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)

368 return ret;

369 off += towrite;

370 if (off < pkt->size) {

371 uint8_t marker = 0xC0 | pkt->channel_id;

372 if ((ret = ffurl_write(h, &marker, 1)) < 0)

373 return ret;

374 written++;

375 }

376 }

377 return written;

378 }

379

380 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,

381 int timestamp, int size)

382 {

383 if (size) {

384 pkt->data = av_malloc(size);

385 if (!pkt->data)

386 return AVERROR(ENOMEM);

387 }

388 pkt->size = size;

389 pkt->channel_id = channel_id;

390 pkt->type = type;

391 pkt->timestamp = timestamp;

392 pkt->extra = 0;

393 pkt->ts_delta = 0;

394

395 return 0;

396 }

397

398 void ff_rtmp_packet_destroy(RTMPPacket *pkt)

399 {

400 if (!pkt)

401 return;

402 av_freep(&pkt->data);

403 pkt->size = 0;

404 }

405

406 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)

407 {

408 const uint8_t *base = data;

409 AMFDataType type;

410 unsigned nb = -1;

411 int parse_key = 1;

412

413 if (data >= data_end)

414 return -1;

415 switch ((type = *data++)) {

416 case AMF_DATA_TYPE_NUMBER: return 9;

417 case AMF_DATA_TYPE_BOOL: return 2;

418 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);

419 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);

420 case AMF_DATA_TYPE_NULL: return 1;

421 case AMF_DATA_TYPE_ARRAY:

422 parse_key = 0;

423 case AMF_DATA_TYPE_MIXEDARRAY:

424 nb = bytestream_get_be32(&data);

425 case AMF_DATA_TYPE_OBJECT:

426 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {

427 int t;

428 if (parse_key) {

429 int size = bytestream_get_be16(&data);

430 if (!size) {

431 data++;

432 break;

433 }

434 if (size < 0 || size >= data_end - data)

435 return -1;

436 data += size;

437 }

438 t = ff_amf_tag_size(data, data_end);

439 if (t < 0 || t >= data_end - data)

440 return -1;

441 data += t;

442 }

443 return data - base;

444 case AMF_DATA_TYPE_OBJECT_END: return 1;

445 default: return -1;

446 }

447 }

448

449 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,

450 const uint8_t *name, uint8_t *dst, int dst_size)

451 {

452 int namelen = strlen(name);

453 int len;

454

455 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {

456 len = ff_amf_tag_size(data, data_end);

457 if (len < 0)

458 len = data_end - data;

459 data += len;

460 }

461 if (data_end - data < 3)

462 return -1;

463 data++;

464 for (;;) {

465 int size = bytestream_get_be16(&data);

466 if (!size)

467 break;

468 if (size < 0 || size >= data_end - data)

469 return -1;

470 data += size;

471 if (size == namelen && !memcmp(data-size, name, namelen)) {

472 switch (*data++) {

473 case AMF_DATA_TYPE_NUMBER:

474 snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data)));

475 break;

476 case AMF_DATA_TYPE_BOOL:

477 snprintf(dst, dst_size, "%s", *data ? "true" : "false");

478 break;

479 case AMF_DATA_TYPE_STRING:

480 len = bytestream_get_be16(&data);

481 av_strlcpy(dst, data, FFMIN(len+1, dst_size));

482 break;

483 default:

484 return -1;

485 }

486 return 0;

487 }

488 len = ff_amf_tag_size(data, data_end);

489 if (len < 0 || len >= data_end - data)

490 return -1;

491 data += len;

492 }

493 return -1;

494 }

495

496 static const char* rtmp_packet_type(int type)

497 {

498 switch (type) {

499 case RTMP_PT_CHUNK_SIZE: return "chunk size";

500 case RTMP_PT_BYTES_READ: return "bytes read";

501 case RTMP_PT_PING: return "ping";

502 case RTMP_PT_SERVER_BW: return "server bandwidth";

503 case RTMP_PT_CLIENT_BW: return "client bandwidth";

504 case RTMP_PT_AUDIO: return "audio packet";

505 case RTMP_PT_VIDEO: return "video packet";

506 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";

507 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";

508 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";

509 case RTMP_PT_NOTIFY: return "notification";

510 case RTMP_PT_SHARED_OBJ: return "shared object";

511 case RTMP_PT_INVOKE: return "invoke";

512 case RTMP_PT_METADATA: return "metadata";

513 default: return "unknown";

514 }

515 }

516

517 static void amf_tag_contents(void *ctx, const uint8_t *data,

518 const uint8_t *data_end)

519 {

520 unsigned int size, nb = -1;

521 char buf[1024];

522 AMFDataType type;

523 int parse_key = 1;

524

525 if (data >= data_end)

526 return;

527 switch ((type = *data++)) {

528 case AMF_DATA_TYPE_NUMBER:

529 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data)));

530 return;

531 case AMF_DATA_TYPE_BOOL:

532 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);

533 return;

534 case AMF_DATA_TYPE_STRING:

535 case AMF_DATA_TYPE_LONG_STRING:

536 if (type == AMF_DATA_TYPE_STRING) {

537 size = bytestream_get_be16(&data);

538 } else {

539 size = bytestream_get_be32(&data);

540 }

541 size = FFMIN(size, sizeof(buf) - 1);

542 memcpy(buf, data, size);

543 buf[size] = 0;

544 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);

545 return;

546 case AMF_DATA_TYPE_NULL:

547 av_log(ctx, AV_LOG_DEBUG, " NULL\n");

548 return;

549 case AMF_DATA_TYPE_ARRAY:

550 parse_key = 0;

551 case AMF_DATA_TYPE_MIXEDARRAY:

552 nb = bytestream_get_be32(&data);

553 case AMF_DATA_TYPE_OBJECT:

554 av_log(ctx, AV_LOG_DEBUG, " {\n");

555 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {

556 int t;

557 if (parse_key) {

558 size = bytestream_get_be16(&data);

559 size = FFMIN(size, sizeof(buf) - 1);

560 if (!size) {

561 av_log(ctx, AV_LOG_DEBUG, " }\n");

562 data++;

563 break;

564 }

565 memcpy(buf, data, size);

566 buf[size] = 0;

567 if (size >= data_end - data)

568 return;

569 data += size;

570 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);

571 }

572 amf_tag_contents(ctx, data, data_end);

573 t = ff_amf_tag_size(data, data_end);

574 if (t < 0 || t >= data_end - data)

575 return;

576 data += t;

577 }

578 return;

579 case AMF_DATA_TYPE_OBJECT_END:

580 av_log(ctx, AV_LOG_DEBUG, " }\n");

581 return;

582 default:

583 return;

584 }

585 }

586

587 void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)

588 {

589 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",

590 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->size);

591 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {

592 uint8_t *src = p->data, *src_end = p->data + p->size;

593 while (src < src_end) {

594 int sz;

595 amf_tag_contents(ctx, src, src_end);

596 sz = ff_amf_tag_size(src, src_end);

597 if (sz < 0)

598 break;

599 src += sz;

600 }

601 } else if (p->type == RTMP_PT_SERVER_BW){

602 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));

603 } else if (p->type == RTMP_PT_CLIENT_BW){

604 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));

605 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {

606 int i;

607 for (i = 0; i < p->size; i++)

608 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);

609 av_log(ctx, AV_LOG_DEBUG, "\n");

610 }

611 }

612

613 int ff_amf_match_string(const uint8_t *data, int size, const char *str)

614 {

615 int len = strlen(str);

616 int amf_len, type;

617

618 if (size < 1)

619 return 0;

620

621 type = *data++;

622

623 if (type != AMF_DATA_TYPE_LONG_STRING &&

624 type != AMF_DATA_TYPE_STRING)

625 return 0;

626

627 if (type == AMF_DATA_TYPE_LONG_STRING) {

628 if ((size -= 4 + 1) < 0)

629 return 0;

630 amf_len = bytestream_get_be32(&data);

631 } else {

632 if ((size -= 2 + 1) < 0)

633 return 0;

634 amf_len = bytestream_get_be16(&data);

635 }

636

637 if (amf_len > size)

638 return 0;

639

640 if (amf_len != len)

641 return 0;

642

643 return !memcmp(data, str, len);

644 }

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