audio_parameters.cc revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
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      input_channels_(0) {
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      input_channels_(0) {
32}
33
34AudioParameters::AudioParameters(Format format, ChannelLayout channel_layout,
35                                 int input_channels,
36                                 int sample_rate, int bits_per_sample,
37                                 int frames_per_buffer)
38    : format_(format),
39      channel_layout_(channel_layout),
40      sample_rate_(sample_rate),
41      bits_per_sample_(bits_per_sample),
42      frames_per_buffer_(frames_per_buffer),
43      channels_(ChannelLayoutToChannelCount(channel_layout)),
44      input_channels_(input_channels) {
45}
46
47void AudioParameters::Reset(Format format, ChannelLayout channel_layout,
48                            int channels, int input_channels,
49                            int sample_rate, int bits_per_sample,
50                            int frames_per_buffer) {
51  if (channel_layout != CHANNEL_LAYOUT_DISCRETE)
52    DCHECK_EQ(channels, ChannelLayoutToChannelCount(channel_layout));
53
54  format_ = format;
55  channel_layout_ = channel_layout;
56  channels_ = channels;
57  input_channels_ = input_channels;
58  sample_rate_ = sample_rate;
59  bits_per_sample_ = bits_per_sample;
60  frames_per_buffer_ = frames_per_buffer;
61}
62
63bool AudioParameters::IsValid() const {
64  return (format_ >= AUDIO_PCM_LINEAR) &&
65         (format_ < AUDIO_LAST_FORMAT) &&
66         (channels_ > 0) &&
67         (channels_ <= media::limits::kMaxChannels) &&
68         (channel_layout_ > CHANNEL_LAYOUT_UNSUPPORTED) &&
69         (channel_layout_ < CHANNEL_LAYOUT_MAX) &&
70         (input_channels_ >= 0) &&
71         (input_channels_ <= media::limits::kMaxChannels) &&
72         (sample_rate_ >= media::limits::kMinSampleRate) &&
73         (sample_rate_ <= media::limits::kMaxSampleRate) &&
74         (bits_per_sample_ > 0) &&
75         (bits_per_sample_ <= media::limits::kMaxBitsPerSample) &&
76         (frames_per_buffer_ > 0) &&
77         (frames_per_buffer_ <= media::limits::kMaxSamplesPerPacket);
78}
79
80int AudioParameters::GetBytesPerBuffer() const {
81  return frames_per_buffer_ * GetBytesPerFrame();
82}
83
84int AudioParameters::GetBytesPerSecond() const {
85  return sample_rate_ * GetBytesPerFrame();
86}
87
88int AudioParameters::GetBytesPerFrame() const {
89  return channels_ * bits_per_sample_ / 8;
90}
91
92void AudioParameters::SetDiscreteChannels(int channels) {
93  channel_layout_ = CHANNEL_LAYOUT_DISCRETE;
94  channels_ = channels;
95}
96
97}  // namespace media
98