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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "media/base/audio_bus.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "base/memory/aligned_memory.h" | |
9 #include "media/base/decrypt_config.h" | |
10 | |
11 namespace media { | |
12 | |
13 // Ensure each channel is 16-byte aligned for easy SSE optimizations. | |
14 static const int kChannelAlignment = 16; | |
15 | |
16 AudioBus::AudioBus(int channels, int frames, ChannelLayout channel_layout) | |
17 : frames_(frames), | |
18 channel_layout_(channel_layout) { | |
19 // 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.
| |
20 int aligned_frames = | |
21 (frames_ + kChannelAlignment - 1) & ~(kChannelAlignment - 1); | |
22 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'
| |
23 | |
24 audio_data_.reset(static_cast<float*>(base::AlignedAlloc( | |
25 audio_data_size_, kChannelAlignment))); | |
26 | |
27 // 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.
| |
28 audio_data_vector_.reserve(channels); | |
29 for (int i = 0; i < channels; ++i) | |
30 audio_data_vector_.push_back(audio_data_.get() + i * aligned_frames); | |
31 } | |
32 | |
33 AudioBus::AudioBus(int frames, const std::vector<float*>& audio_data_vector) | |
34 : audio_data_vector_(audio_data_vector), | |
35 frames_(frames), | |
36 channel_layout_(CHANNEL_LAYOUT_NONE) { | |
37 // Sanity check wrapped vector for alignment and channel count. | |
38 for (size_t i = 0; i < audio_data_vector_.size(); ++i) { | |
39 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.
| |
40 (kChannelAlignment - 1), 0U); | |
41 } | |
42 } | |
43 | |
44 AudioBus::~AudioBus() {} | |
45 | |
46 scoped_ptr<AudioBus> AudioBus::Create(int channels, int frames) { | |
47 return scoped_ptr<AudioBus>(new AudioBus( | |
48 channels, frames, CHANNEL_LAYOUT_NONE)); | |
49 } | |
50 | |
51 scoped_ptr<AudioBus> AudioBus::Create(const AudioParameters& params) { | |
52 return scoped_ptr<AudioBus>(new AudioBus( | |
53 params.channels(), params.frames_per_buffer(), params.channel_layout())); | |
54 } | |
55 | |
56 scoped_ptr<AudioBus> AudioBus::WrapVector( | |
57 int frames, const std::vector<float*>& audio_data_vector) { | |
58 return scoped_ptr<AudioBus>(new AudioBus(frames, audio_data_vector)); | |
59 } | |
60 | |
61 void AudioBus::Zero(int frames) { | |
62 DCHECK_LE(frames, frames_); | |
63 for (size_t i = 0; i < audio_data_vector_.size(); ++i) | |
64 memset(audio_data_vector_[i], 0, frames * sizeof(*audio_data_vector_[i])); | |
65 } | |
66 | |
67 } // namespace media | |
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