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1 /* | 1 /* |
2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2012 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 |
11 #include "webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.h" | 11 #include "webrtc/modules/rtp_rtcp/source/forward_error_correction_internal.h" |
12 | 12 |
13 #include <assert.h> | 13 #include <assert.h> |
14 #include <string.h> | 14 #include <string.h> |
15 | 15 |
| 16 #include <algorithm> |
| 17 |
16 #include "webrtc/modules/rtp_rtcp/source/fec_private_tables_bursty.h" | 18 #include "webrtc/modules/rtp_rtcp/source/fec_private_tables_bursty.h" |
17 #include "webrtc/modules/rtp_rtcp/source/fec_private_tables_random.h" | 19 #include "webrtc/modules/rtp_rtcp/source/fec_private_tables_random.h" |
18 | 20 |
19 namespace { | 21 namespace { |
20 using webrtc::fec_private_tables::kPacketMaskBurstyTbl; | 22 using webrtc::fec_private_tables::kPacketMaskBurstyTbl; |
21 using webrtc::fec_private_tables::kPacketMaskRandomTbl; | 23 using webrtc::fec_private_tables::kPacketMaskRandomTbl; |
22 | 24 |
23 // Allow for different modes of protection for packets in UEP case. | 25 // Allow for different modes of protection for packets in UEP case. |
24 enum ProtectionMode { | 26 enum ProtectionMode { |
25 kModeNoOverlap, | 27 kModeNoOverlap, |
(...skipping 359 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
385 memcpy(packet_mask, | 387 memcpy(packet_mask, |
386 mask_table.fec_packet_mask_table()[num_media_packets - | 388 mask_table.fec_packet_mask_table()[num_media_packets - |
387 1][num_fec_packets - 1], | 389 1][num_fec_packets - 1], |
388 num_fec_packets * num_mask_bytes); | 390 num_fec_packets * num_mask_bytes); |
389 } else { // UEP case | 391 } else { // UEP case |
390 UnequalProtectionMask(num_media_packets, num_fec_packets, num_imp_packets, | 392 UnequalProtectionMask(num_media_packets, num_fec_packets, num_imp_packets, |
391 num_mask_bytes, packet_mask, mask_table); | 393 num_mask_bytes, packet_mask, mask_table); |
392 } // End of UEP modification | 394 } // End of UEP modification |
393 } // End of GetPacketMasks | 395 } // End of GetPacketMasks |
394 | 396 |
| 397 void InsertZeroColumns(int num_zeros, |
| 398 uint8_t* new_mask, |
| 399 int new_mask_bytes, |
| 400 int num_fec_packets, |
| 401 int new_bit_index) { |
| 402 for (uint16_t row = 0; row < num_fec_packets; ++row) { |
| 403 const int new_byte_index = row * new_mask_bytes + new_bit_index / 8; |
| 404 const int max_shifts = (7 - (new_bit_index % 8)); |
| 405 new_mask[new_byte_index] <<= std::min(num_zeros, max_shifts); |
| 406 } |
| 407 } |
| 408 |
| 409 void CopyColumn(uint8_t* new_mask, |
| 410 int new_mask_bytes, |
| 411 uint8_t* old_mask, |
| 412 int old_mask_bytes, |
| 413 int num_fec_packets, |
| 414 int new_bit_index, |
| 415 int old_bit_index) { |
| 416 // Copy column from the old mask to the beginning of the new mask and shift it |
| 417 // out from the old mask. |
| 418 for (uint16_t row = 0; row < num_fec_packets; ++row) { |
| 419 int new_byte_index = row * new_mask_bytes + new_bit_index / 8; |
| 420 int old_byte_index = row * old_mask_bytes + old_bit_index / 8; |
| 421 new_mask[new_byte_index] |= ((old_mask[old_byte_index] & 0x80) >> 7); |
| 422 if (new_bit_index % 8 != 7) { |
| 423 new_mask[new_byte_index] <<= 1; |
| 424 } |
| 425 old_mask[old_byte_index] <<= 1; |
| 426 } |
| 427 } |
| 428 |
395 } // namespace internal | 429 } // namespace internal |
396 } // namespace webrtc | 430 } // namespace webrtc |
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