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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
// Copyright (c) 2011 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/audio/mac/audio_input_mac.h"
#include "base/basictypes.h"
#include "base/logging.h"
#include "media/audio/audio_util.h"
#include "media/audio/mac/audio_manager_mac.h"
#if !defined(MAC_OS_X_VERSION_10_6) || \
MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
enum {
kAudioQueueErr_EnqueueDuringReset = -66632
};
#endif
PCMQueueInAudioInputStream::PCMQueueInAudioInputStream(
AudioManagerMac* manager, const AudioParameters& params)
: manager_(manager),
callback_(NULL),
audio_queue_(NULL),
buffer_size_bytes_(0) {
// We must have a manager.
DCHECK(manager_);
// A frame is one sample across all channels. In interleaved audio the per
// frame fields identify the set of n |channels|. In uncompressed audio, a
// packet is always one frame.
format_.mSampleRate = params.sample_rate;
format_.mFormatID = kAudioFormatLinearPCM;
format_.mFormatFlags = kLinearPCMFormatFlagIsPacked |
kLinearPCMFormatFlagIsSignedInteger;
format_.mBitsPerChannel = params.bits_per_sample;
format_.mChannelsPerFrame = params.channels;
format_.mFramesPerPacket = 1;
format_.mBytesPerPacket = (params.bits_per_sample * params.channels) / 8;
format_.mBytesPerFrame = format_.mBytesPerPacket;
format_.mReserved = 0;
buffer_size_bytes_ = params.GetPacketSize();
}
PCMQueueInAudioInputStream::~PCMQueueInAudioInputStream() {
DCHECK(!callback_);
DCHECK(!audio_queue_);
}
bool PCMQueueInAudioInputStream::Open() {
OSStatus err = AudioQueueNewInput(&format_,
&HandleInputBufferStatic,
this,
NULL, // Use OS CFRunLoop for |callback|
kCFRunLoopCommonModes,
0, // Reserved
&audio_queue_);
if (err != noErr) {
HandleError(err);
return false;
}
return SetupBuffers();
}
void PCMQueueInAudioInputStream::Start(AudioInputCallback* callback) {
DCHECK(callback);
DCHECK(audio_queue_) << "Must call Open() first";
if (callback_)
return;
callback_ = callback;
OSStatus err = AudioQueueStart(audio_queue_, NULL);
if (err != noErr)
HandleError(err);
}
void PCMQueueInAudioInputStream::Stop() {
if (!audio_queue_)
return;
// We request a synchronous stop, so the next call can take some time. In
// the windows implementation we block here as well.
OSStatus err = AudioQueueStop(audio_queue_, true);
if (err != noErr)
HandleError(err);
}
void PCMQueueInAudioInputStream::Close() {
// It is valid to call Close() before calling Open() or Start(), thus
// |audio_queue_| and |callback_| might be NULL.
if (audio_queue_) {
OSStatus err = AudioQueueDispose(audio_queue_, true);
audio_queue_ = NULL;
if (err != noErr)
HandleError(err);
}
if (callback_) {
callback_->OnClose(this);
callback_ = NULL;
}
manager_->ReleaseInputStream(this);
// CARE: This object may now be destroyed.
}
void PCMQueueInAudioInputStream::HandleError(OSStatus err) {
if (callback_)
callback_->OnError(this, static_cast<int>(err));
NOTREACHED() << "error code " << err;
}
bool PCMQueueInAudioInputStream::SetupBuffers() {
DCHECK(buffer_size_bytes_);
for (int i = 0; i < kNumberBuffers; ++i) {
AudioQueueBufferRef buffer;
OSStatus err = AudioQueueAllocateBuffer(audio_queue_,
buffer_size_bytes_,
&buffer);
if (err == noErr)
err = QueueNextBuffer(buffer);
if (err != noErr) {
HandleError(err);
return false;
}
// |buffer| will automatically be freed when |audio_queue_| is released.
}
return true;
}
OSStatus PCMQueueInAudioInputStream::QueueNextBuffer(
AudioQueueBufferRef audio_buffer) {
// Only the first 2 params are needed for recording.
return AudioQueueEnqueueBuffer(audio_queue_, audio_buffer, 0, NULL);
}
// static
void PCMQueueInAudioInputStream::HandleInputBufferStatic(
void* data,
AudioQueueRef audio_queue,
AudioQueueBufferRef audio_buffer,
const AudioTimeStamp* start_time,
UInt32 num_packets,
const AudioStreamPacketDescription* desc) {
reinterpret_cast<PCMQueueInAudioInputStream*>(data)->
HandleInputBuffer(audio_queue, audio_buffer, start_time,
num_packets, desc);
}
void PCMQueueInAudioInputStream::HandleInputBuffer(
AudioQueueRef audio_queue,
AudioQueueBufferRef audio_buffer,
const AudioTimeStamp* start_time,
UInt32 num_packets,
const AudioStreamPacketDescription* packet_desc) {
DCHECK_EQ(audio_queue_, audio_queue);
DCHECK(audio_buffer->mAudioData);
if (!callback_) {
// This can happen if Stop() was called without start.
DCHECK_EQ(0U, audio_buffer->mAudioDataByteSize);
return;
}
if (audio_buffer->mAudioDataByteSize)
callback_->OnData(this,
reinterpret_cast<const uint8*>(audio_buffer->mAudioData),
audio_buffer->mAudioDataByteSize,
audio_buffer->mAudioDataByteSize);
// Recycle the buffer.
OSStatus err = QueueNextBuffer(audio_buffer);
if (err != noErr) {
if (err == kAudioQueueErr_EnqueueDuringReset) {
// This is the error you get if you try to enqueue a buffer and the
// queue has been closed. Not really a problem if indeed the queue
// has been closed.
// TODO(joth): PCMQueueOutAudioOutputStream uses callback_ to provide an
// extra guard for this situation, but it seems to introduce more
// complications than it solves (memory barrier issues accessing it from
// multiple threads, looses the means to indicate OnClosed to client).
// Should determine if we need to do something equivalent here.
return;
}
HandleError(err);
}
}
|
