audio_parameters.cc revision 1320f92c476a1ad9d19dba2a48c72b75566198e9 
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/audio/audio_parameters.h"
6
7#include "base/logging.h"
8#include "media/base/limits.h"
9
10namespace media {
11
12AudioParameters::AudioParameters()
13    : format_(AUDIO_PCM_LINEAR),
14      channel_layout_(CHANNEL_LAYOUT_NONE),
15      sample_rate_(0),
16      bits_per_sample_(0),
17      frames_per_buffer_(0),
18      channels_(0),
19      effects_(NO_EFFECTS) {
20}
21
22AudioParameters::AudioParameters(Format format, ChannelLayout channel_layout,
23                                 int sample_rate, int bits_per_sample,
24                                 int frames_per_buffer)
25    : format_(format),
26      channel_layout_(channel_layout),
27      sample_rate_(sample_rate),
28      bits_per_sample_(bits_per_sample),
29      frames_per_buffer_(frames_per_buffer),
30      channels_(ChannelLayoutToChannelCount(channel_layout)),
31      effects_(NO_EFFECTS) {
32}
33
34AudioParameters::AudioParameters(Format format, ChannelLayout channel_layout,
35                                 int sample_rate, int bits_per_sample,
36                                 int frames_per_buffer, int effects)
37    : format_(format),
38      channel_layout_(channel_layout),
39      sample_rate_(sample_rate),
40      bits_per_sample_(bits_per_sample),
41      frames_per_buffer_(frames_per_buffer),
42      channels_(ChannelLayoutToChannelCount(channel_layout)),
43      effects_(effects) {
44}
45
46AudioParameters::AudioParameters(Format format, ChannelLayout channel_layout,
47                                 int channels, int sample_rate,
48                                 int bits_per_sample, int frames_per_buffer,
49                                 int effects)
50    : format_(format),
51      channel_layout_(channel_layout),
52      sample_rate_(sample_rate),
53      bits_per_sample_(bits_per_sample),
54      frames_per_buffer_(frames_per_buffer),
55      channels_(channels),
56      effects_(effects) {
57  if (channel_layout != CHANNEL_LAYOUT_DISCRETE)
58    DCHECK_EQ(channels, ChannelLayoutToChannelCount(channel_layout));
59}
60
61void AudioParameters::Reset(Format format, ChannelLayout channel_layout,
62                            int channels, int sample_rate,
63                            int bits_per_sample, int frames_per_buffer) {
64  if (channel_layout != CHANNEL_LAYOUT_DISCRETE)
65    DCHECK_EQ(channels, ChannelLayoutToChannelCount(channel_layout));
66
67  format_ = format;
68  channel_layout_ = channel_layout;
69  channels_ = channels;
70  sample_rate_ = sample_rate;
71  bits_per_sample_ = bits_per_sample;
72  frames_per_buffer_ = frames_per_buffer;
73}
74
75bool AudioParameters::IsValid() const {
76  return (format_ >= AUDIO_PCM_LINEAR) &&
77         (format_ < AUDIO_LAST_FORMAT) &&
78         (channels_ > 0) &&
79         (channels_ <= media::limits::kMaxChannels) &&
80         (channel_layout_ > CHANNEL_LAYOUT_UNSUPPORTED) &&
81         (channel_layout_ <= CHANNEL_LAYOUT_MAX) &&
82         (sample_rate_ >= media::limits::kMinSampleRate) &&
83         (sample_rate_ <= media::limits::kMaxSampleRate) &&
84         (bits_per_sample_ > 0) &&
85         (bits_per_sample_ <= media::limits::kMaxBitsPerSample) &&
86         (frames_per_buffer_ > 0) &&
87         (frames_per_buffer_ <= media::limits::kMaxSamplesPerPacket);
88}
89
90int AudioParameters::GetBytesPerBuffer() const {
91  return frames_per_buffer_ * GetBytesPerFrame();
92}
93
94int AudioParameters::GetBytesPerSecond() const {
95  return sample_rate_ * GetBytesPerFrame();
96}
97
98int AudioParameters::GetBytesPerFrame() const {
99  return channels_ * bits_per_sample_ / 8;
100}
101
102base::TimeDelta AudioParameters::GetBufferDuration() const {
103  return base::TimeDelta::FromMicroseconds(
104      frames_per_buffer_ * base::Time::kMicrosecondsPerSecond /
105      static_cast<float>(sample_rate_));
106}
107
108bool AudioParameters::Equals(const AudioParameters& other) const {
109  return format_ == other.format() &&
110         sample_rate_ == other.sample_rate() &&
111         channel_layout_ == other.channel_layout() &&
112         channels_ == other.channels() &&
113         bits_per_sample_ == other.bits_per_sample() &&
114         frames_per_buffer_ == other.frames_per_buffer() &&
115         effects_ == other.effects();
116}
117
118}  // namespace media
119