1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
// 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.
#ifndef MEDIA_AUDIO_SIMPLE_SOURCES_H_
#define MEDIA_AUDIO_SIMPLE_SOURCES_H_
#include "base/files/file_path.h"
#include "base/synchronization/lock.h"
#include "media/audio/audio_io.h"
#include "media/base/audio_converter.h"
#include "media/base/seekable_buffer.h"
namespace media {
class WavAudioHandler;
// An audio source that produces a pure sinusoidal tone.
class MEDIA_EXPORT SineWaveAudioSource
: public AudioOutputStream::AudioSourceCallback {
public:
// |channels| is the number of audio channels, |freq| is the frequency in
// hertz and it has to be less than half of the sampling frequency
// |sample_freq| or else you will get aliasing.
SineWaveAudioSource(int channels, double freq, double sample_freq);
~SineWaveAudioSource() override;
// Return up to |cap| samples of data via OnMoreData(). Use Reset() to
// allow more data to be served.
void CapSamples(int cap);
void Reset();
// Implementation of AudioSourceCallback.
int OnMoreData(AudioBus* audio_bus,
uint32_t total_bytes_delay,
uint32_t frames_skipped) override;
void OnError(AudioOutputStream* stream) override;
// The number of OnMoreData() and OnError() calls respectively.
int callbacks() { return callbacks_; }
int errors() { return errors_; }
protected:
int channels_;
double f_;
int time_state_;
int cap_;
int callbacks_;
int errors_;
base::Lock time_lock_;
};
class MEDIA_EXPORT FileSource : public AudioOutputStream::AudioSourceCallback,
public AudioConverter::InputCallback {
public:
FileSource(const AudioParameters& params,
const base::FilePath& path_to_wav_file);
~FileSource() override;
// Implementation of AudioSourceCallback.
int OnMoreData(AudioBus* audio_bus,
uint32_t total_bytes_delay,
uint32_t frames_skipped) override;
void OnError(AudioOutputStream* stream) override;
private:
AudioParameters params_;
base::FilePath path_to_wav_file_;
// The WAV data at |path_to_wav_file_| is read into memory and kept here.
// This memory needs to survive for the lifetime of |wav_audio_handler_|,
// so declare it first. Do not access this member directly.
scoped_ptr<char[]> raw_wav_data_;
scoped_ptr<WavAudioHandler> wav_audio_handler_;
scoped_ptr<AudioConverter> file_audio_converter_;
int wav_file_read_pos_;
bool load_failed_;
// Provides audio data from wav_audio_handler_ into the file audio converter.
double ProvideInput(AudioBus* audio_bus,
base::TimeDelta buffer_delay) override;
// Loads the wav file on the first OnMoreData invocation.
void LoadWavFile(const base::FilePath& path_to_wav_file);
};
class BeepingSource : public AudioOutputStream::AudioSourceCallback {
public:
BeepingSource(const AudioParameters& params);
~BeepingSource() override;
// Implementation of AudioSourceCallback.
int OnMoreData(AudioBus* audio_bus,
uint32_t total_bytes_delay,
uint32_t frames_skipped) override;
void OnError(AudioOutputStream* stream) override;
static void BeepOnce();
private:
int buffer_size_;
scoped_ptr<uint8_t[]> buffer_;
AudioParameters params_;
base::TimeTicks last_callback_time_;
base::TimeDelta interval_from_last_beep_;
int beep_duration_in_buffers_;
int beep_generated_in_buffers_;
int beep_period_in_frames_;
};
} // namespace media
#endif // MEDIA_AUDIO_SIMPLE_SOURCES_H_
|
