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1 /* | 1 /* |
2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
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372 } | 372 } |
373 | 373 |
374 size_t RepairedRtpStreamId::ValueSize(const std::string& rsid) { | 374 size_t RepairedRtpStreamId::ValueSize(const std::string& rsid) { |
375 return RtpStreamId::ValueSize(rsid); | 375 return RtpStreamId::ValueSize(rsid); |
376 } | 376 } |
377 | 377 |
378 bool RepairedRtpStreamId::Write(uint8_t* data, const std::string& rsid) { | 378 bool RepairedRtpStreamId::Write(uint8_t* data, const std::string& rsid) { |
379 return RtpStreamId::Write(data, rsid); | 379 return RtpStreamId::Write(data, rsid); |
380 } | 380 } |
381 | 381 |
| 382 // For Frame Marking RTP Header Extension: |
| 383 // |
| 384 // https://tools.ietf.org/html/draft-ietf-avtext-framemarking-04#page-4 |
| 385 // This extensions provides meta-information about the RTP streams outside the |
| 386 // encrypted media payload, an RTP switch can do codec-agnostic |
| 387 // selective forwarding without decrypting the payload. |
| 388 // |
| 389 // for Non-Scalable Streams: |
| 390 // |
| 391 // 0 1 |
| 392 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 |
| 393 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 394 // | ID=? | L=0 |S|E|I|D|0 0 0 0| |
| 395 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 396 // |
| 397 // for Scalable Streams: |
| 398 // |
| 399 // 0 1 2 3 |
| 400 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
| 401 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 402 // | ID=? | L=2 |S|E|I|D|B| TID | LID | TL0PICIDX | |
| 403 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 404 // |
| 405 constexpr RTPExtensionType FrameMarking::kId; |
| 406 constexpr const char* FrameMarking::kUri; |
| 407 |
| 408 bool FrameMarking::Parse(rtc::ArrayView<const uint8_t> data, |
| 409 FrameMarks* frame_marks) { |
| 410 RTC_DCHECK(frame_marks); |
| 411 |
| 412 if (data.empty()) |
| 413 return false; |
| 414 |
| 415 // Set frame marking data |
| 416 frame_marks->start_of_frame = (data[0] & 0x80) != 0; |
| 417 frame_marks->end_of_frame = (data[0] & 0x40) != 0; |
| 418 frame_marks->independent = (data[0] & 0x20) != 0; |
| 419 frame_marks->discardable = (data[0] & 0x10) != 0; |
| 420 |
| 421 // Check variable length. |
| 422 if (data.size() == 1) { |
| 423 // We are non-scalable. |
| 424 frame_marks->base_layer_sync = false; |
| 425 frame_marks->temporal_layer_id = 0; |
| 426 frame_marks->layer_id = 0; |
| 427 frame_marks->tl0_pic_idx = 0; |
| 428 } else if (data.size() == 3) { |
| 429 // Set scalable parts |
| 430 frame_marks->base_layer_sync = (data[0] & 0x08) != 0; |
| 431 frame_marks->temporal_layer_id = data[0] & 0x07; |
| 432 frame_marks->layer_id = data[1]; |
| 433 frame_marks->tl0_pic_idx = data[2]; |
| 434 } else { |
| 435 // Incorrect length. |
| 436 return false; |
| 437 } |
| 438 return true; |
| 439 } |
| 440 |
| 441 bool FrameMarking::IsScalable(const FrameMarks& frame_marks) { |
| 442 return (frame_marks.base_layer_sync || |
| 443 (frame_marks.temporal_layer_id && |
| 444 frame_marks.temporal_layer_id != kNoTemporalIdx) || |
| 445 (frame_marks.layer_id && frame_marks.layer_id != kNoSpatialIdx) || |
| 446 (frame_marks.tl0_pic_idx && frame_marks.tl0_pic_idx != kNoTl0PicIdx)); |
| 447 } |
| 448 |
| 449 size_t FrameMarking::ValueSize(const FrameMarks& frame_marks) { |
| 450 return IsScalable(frame_marks) ? 3 : 1; |
| 451 } |
| 452 |
| 453 bool FrameMarking::Write(uint8_t* data, const FrameMarks& frame_marks) { |
| 454 data[0] = frame_marks.start_of_frame ? 0x80 : 0x00; |
| 455 data[0] |= frame_marks.end_of_frame ? 0x40 : 0x00; |
| 456 data[0] |= frame_marks.independent ? 0x20 : 0x00; |
| 457 data[0] |= frame_marks.discardable ? 0x10 : 0x00; |
| 458 |
| 459 // Check if it is scalable. |
| 460 if (IsScalable(frame_marks)) { |
| 461 data[0] |= frame_marks.base_layer_sync ? 0x08 : 0x00; |
| 462 data[0] |= (frame_marks.temporal_layer_id & 0x07); |
| 463 data[1] = frame_marks.layer_id; |
| 464 data[2] = static_cast<uint8_t>(frame_marks.tl0_pic_idx); |
| 465 } |
| 466 return true; |
| 467 } |
| 468 |
| 469 uint8_t FrameMarking::CreateLayerId(const RTPVideoHeaderVP9& vp9) { |
| 470 // The following shows VP9 Layer encoding information (3 bits for |
| 471 // spatial and temporal layer) mapped to the generic LID and TID fields. |
| 472 // The P and U bits MUST match the corresponding bits in the VP9 Payload |
| 473 // Description. |
| 474 // 0 1 2 3 |
| 475 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
| 476 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 477 // | ID=2 | L=2 |S|E|I|D|B| TID |0|0|0|P|U| SID | TL0PICIDX | |
| 478 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 479 return (vp9.spatial_idx != kNoSpatialIdx ? vp9.spatial_idx & 0x07 : 0x00) | |
| 480 (vp9.temporal_up_switch ? 0x08 : 0x00) | |
| 481 (vp9.inter_pic_predicted ? 0x10 : 0x00); |
| 482 } |
| 483 |
382 } // namespace webrtc | 484 } // namespace webrtc |
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