1 /*
2 * Copyright (c) 2015 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 "webrtc/common_audio/audio_ring_buffer.h"
12
13 #include "webrtc/base/checks.h"
14 #include "webrtc/common_audio/ring_buffer.h"
15
16 // This is a simple multi-channel wrapper over the ring_buffer.h C interface.
17
18 namespace webrtc {
19
AudioRingBuffer(size_t channels,size_t max_frames)20 AudioRingBuffer::AudioRingBuffer(size_t channels, size_t max_frames) {
21 buffers_.reserve(channels);
22 for (size_t i = 0; i < channels; ++i)
23 buffers_.push_back(WebRtc_CreateBuffer(max_frames, sizeof(float)));
24 }
25
~AudioRingBuffer()26 AudioRingBuffer::~AudioRingBuffer() {
27 for (auto buf : buffers_)
28 WebRtc_FreeBuffer(buf);
29 }
30
Write(const float * const * data,size_t channels,size_t frames)31 void AudioRingBuffer::Write(const float* const* data, size_t channels,
32 size_t frames) {
33 RTC_DCHECK_EQ(buffers_.size(), channels);
34 for (size_t i = 0; i < channels; ++i) {
35 const size_t written = WebRtc_WriteBuffer(buffers_[i], data[i], frames);
36 RTC_CHECK_EQ(written, frames);
37 }
38 }
39
Read(float * const * data,size_t channels,size_t frames)40 void AudioRingBuffer::Read(float* const* data, size_t channels, size_t frames) {
41 RTC_DCHECK_EQ(buffers_.size(), channels);
42 for (size_t i = 0; i < channels; ++i) {
43 const size_t read =
44 WebRtc_ReadBuffer(buffers_[i], nullptr, data[i], frames);
45 RTC_CHECK_EQ(read, frames);
46 }
47 }
48
ReadFramesAvailable() const49 size_t AudioRingBuffer::ReadFramesAvailable() const {
50 // All buffers have the same amount available.
51 return WebRtc_available_read(buffers_[0]);
52 }
53
WriteFramesAvailable() const54 size_t AudioRingBuffer::WriteFramesAvailable() const {
55 // All buffers have the same amount available.
56 return WebRtc_available_write(buffers_[0]);
57 }
58
MoveReadPositionForward(size_t frames)59 void AudioRingBuffer::MoveReadPositionForward(size_t frames) {
60 for (auto buf : buffers_) {
61 const size_t moved =
62 static_cast<size_t>(WebRtc_MoveReadPtr(buf, static_cast<int>(frames)));
63 RTC_CHECK_EQ(moved, frames);
64 }
65 }
66
MoveReadPositionBackward(size_t frames)67 void AudioRingBuffer::MoveReadPositionBackward(size_t frames) {
68 for (auto buf : buffers_) {
69 const size_t moved = static_cast<size_t>(
70 -WebRtc_MoveReadPtr(buf, -static_cast<int>(frames)));
71 RTC_CHECK_EQ(moved, frames);
72 }
73 }
74
75 } // namespace webrtc
76