1 /*
2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
3 *
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
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include <assert.h>
12
13 #include <algorithm> // Access to min.
14
15 #include "webrtc/modules/audio_coding/neteq/sync_buffer.h"
16
17 namespace webrtc {
18
FutureLength() const19 size_t SyncBuffer::FutureLength() const {
20 return Size() - next_index_;
21 }
22
PushBack(const AudioMultiVector & append_this)23 void SyncBuffer::PushBack(const AudioMultiVector& append_this) {
24 size_t samples_added = append_this.Size();
25 AudioMultiVector::PushBack(append_this);
26 AudioMultiVector::PopFront(samples_added);
27 if (samples_added <= next_index_) {
28 next_index_ -= samples_added;
29 } else {
30 // This means that we are pushing out future data that was never used.
31 // assert(false);
32 // TODO(hlundin): This assert must be disabled to support 60 ms frames.
33 // This should not happen even for 60 ms frames, but it does. Investigate
34 // why.
35 next_index_ = 0;
36 }
37 dtmf_index_ -= std::min(dtmf_index_, samples_added);
38 }
39
PushFrontZeros(size_t length)40 void SyncBuffer::PushFrontZeros(size_t length) {
41 InsertZerosAtIndex(length, 0);
42 }
43
InsertZerosAtIndex(size_t length,size_t position)44 void SyncBuffer::InsertZerosAtIndex(size_t length, size_t position) {
45 position = std::min(position, Size());
46 length = std::min(length, Size() - position);
47 AudioMultiVector::PopBack(length);
48 for (size_t channel = 0; channel < Channels(); ++channel) {
49 channels_[channel]->InsertZerosAt(length, position);
50 }
51 if (next_index_ >= position) {
52 // We are moving the |next_index_| sample.
53 set_next_index(next_index_ + length); // Overflow handled by subfunction.
54 }
55 if (dtmf_index_ > 0 && dtmf_index_ >= position) {
56 // We are moving the |dtmf_index_| sample.
57 set_dtmf_index(dtmf_index_ + length); // Overflow handled by subfunction.
58 }
59 }
60
ReplaceAtIndex(const AudioMultiVector & insert_this,size_t length,size_t position)61 void SyncBuffer::ReplaceAtIndex(const AudioMultiVector& insert_this,
62 size_t length,
63 size_t position) {
64 position = std::min(position, Size()); // Cap |position| in the valid range.
65 length = std::min(length, Size() - position);
66 AudioMultiVector::OverwriteAt(insert_this, length, position);
67 }
68
ReplaceAtIndex(const AudioMultiVector & insert_this,size_t position)69 void SyncBuffer::ReplaceAtIndex(const AudioMultiVector& insert_this,
70 size_t position) {
71 ReplaceAtIndex(insert_this, insert_this.Size(), position);
72 }
73
GetNextAudioInterleaved(size_t requested_len,int16_t * output)74 size_t SyncBuffer::GetNextAudioInterleaved(size_t requested_len,
75 int16_t* output) {
76 if (!output) {
77 assert(false);
78 return 0;
79 }
80 size_t samples_to_read = std::min(FutureLength(), requested_len);
81 ReadInterleavedFromIndex(next_index_, samples_to_read, output);
82 next_index_ += samples_to_read;
83 return samples_to_read;
84 }
85
IncreaseEndTimestamp(uint32_t increment)86 void SyncBuffer::IncreaseEndTimestamp(uint32_t increment) {
87 end_timestamp_ += increment;
88 }
89
Flush()90 void SyncBuffer::Flush() {
91 Zeros(Size());
92 next_index_ = Size();
93 end_timestamp_ = 0;
94 dtmf_index_ = 0;
95 }
96
set_next_index(size_t value)97 void SyncBuffer::set_next_index(size_t value) {
98 // Cannot set |next_index_| larger than the size of the buffer.
99 next_index_ = std::min(value, Size());
100 }
101
set_dtmf_index(size_t value)102 void SyncBuffer::set_dtmf_index(size_t value) {
103 // Cannot set |dtmf_index_| larger than the size of the buffer.
104 dtmf_index_ = std::min(value, Size());
105 }
106
107 } // namespace webrtc
108