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 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 26 AudioRingBuffer::~AudioRingBuffer() { 27 for (auto buf : buffers_) 28 WebRtc_FreeBuffer(buf); 29 } 30 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 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 49 size_t AudioRingBuffer::ReadFramesAvailable() const { 50 // All buffers have the same amount available. 51 return WebRtc_available_read(buffers_[0]); 52 } 53 54 size_t AudioRingBuffer::WriteFramesAvailable() const { 55 // All buffers have the same amount available. 56 return WebRtc_available_write(buffers_[0]); 57 } 58 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 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
