Index: media/base/audio_bus.cc |
diff --git a/media/base/audio_bus.cc b/media/base/audio_bus.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..afab5858c482b4fe35aa20d3910794c4c7ed0c83 |
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+++ b/media/base/audio_bus.cc |
@@ -0,0 +1,67 @@ |
+// Copyright (c) 2012 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "media/base/audio_bus.h" |
+ |
+#include "base/logging.h" |
+#include "base/memory/aligned_memory.h" |
+#include "media/base/decrypt_config.h" |
+ |
+namespace media { |
+ |
+// Ensure each channel is 16-byte aligned for easy SSE optimizations. |
+static const int kChannelAlignment = 16; |
+ |
+AudioBus::AudioBus(int channels, int frames, ChannelLayout channel_layout) |
+ : frames_(frames), |
+ channel_layout_(channel_layout) { |
+ // Choose a size such that each channel is aligned by kChannelAlignment. |
Chris Rogers
2012/08/06 19:40:26
do we want sanity checking DCHECKS, etc. on channe
DaleCurtis
2012/08/07 01:36:32
Done.
|
+ int aligned_frames = |
+ (frames_ + kChannelAlignment - 1) & ~(kChannelAlignment - 1); |
+ audio_data_size_ = sizeof(float) * channels * aligned_frames; |
Chris Rogers
2012/08/06 19:40:26
The security guys seemed keen on using size_t for
DaleCurtis
2012/08/07 01:36:32
Used CHECK() above plus limits to ensure this can'
|
+ |
+ audio_data_.reset(static_cast<float*>(base::AlignedAlloc( |
+ audio_data_size_, kChannelAlignment))); |
+ |
+ // Seperate audio data out into channels for easy lookup later. |
Chris Rogers
2012/08/06 19:40:26
typo: Seperate
DaleCurtis
2012/08/07 01:36:32
Done.
|
+ audio_data_vector_.reserve(channels); |
+ for (int i = 0; i < channels; ++i) |
+ audio_data_vector_.push_back(audio_data_.get() + i * aligned_frames); |
+} |
+ |
+AudioBus::AudioBus(int frames, const std::vector<float*>& audio_data_vector) |
+ : audio_data_vector_(audio_data_vector), |
+ frames_(frames), |
+ channel_layout_(CHANNEL_LAYOUT_NONE) { |
+ // Sanity check wrapped vector for alignment and channel count. |
+ for (size_t i = 0; i < audio_data_vector_.size(); ++i) { |
+ DCHECK_EQ(reinterpret_cast<uintptr_t>(audio_data_vector_[i]) & |
scherkus (not reviewing)
2012/08/06 18:55:34
idea: add static IsAligned() function at top by co
DaleCurtis
2012/08/07 01:36:32
Done.
|
+ (kChannelAlignment - 1), 0U); |
+ } |
+} |
+ |
+AudioBus::~AudioBus() {} |
+ |
+scoped_ptr<AudioBus> AudioBus::Create(int channels, int frames) { |
+ return scoped_ptr<AudioBus>(new AudioBus( |
+ channels, frames, CHANNEL_LAYOUT_NONE)); |
+} |
+ |
+scoped_ptr<AudioBus> AudioBus::Create(const AudioParameters& params) { |
+ return scoped_ptr<AudioBus>(new AudioBus( |
+ params.channels(), params.frames_per_buffer(), params.channel_layout())); |
+} |
+ |
+scoped_ptr<AudioBus> AudioBus::WrapVector( |
+ int frames, const std::vector<float*>& audio_data_vector) { |
+ return scoped_ptr<AudioBus>(new AudioBus(frames, audio_data_vector)); |
+} |
+ |
+void AudioBus::Zero(int frames) { |
+ DCHECK_LE(frames, frames_); |
+ for (size_t i = 0; i < audio_data_vector_.size(); ++i) |
+ memset(audio_data_vector_[i], 0, frames * sizeof(*audio_data_vector_[i])); |
+} |
+ |
+} // namespace media |