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
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
// Copyright (c) 2009 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 "chrome/common/render_messages.h"
#include "chrome/renderer/audio_message_filter.h"
#include "chrome/renderer/media/audio_renderer_impl.h"
#include "chrome/renderer/render_view.h"
#include "chrome/renderer/render_thread.h"
#include "media/base/filter_host.h"
// We'll try to fill 8192 samples per buffer, which is roughly ~194ms of audio
// data for a 44.1kHz audio source.
static const size_t kSamplesPerBuffer = 8192;
AudioRendererImpl::AudioRendererImpl(AudioMessageFilter* filter)
: AudioRendererBase(kDefaultMaxQueueSize),
filter_(filter),
stream_id_(0),
shared_memory_(NULL),
shared_memory_size_(0),
io_loop_(filter->message_loop()),
stopped_(false),
playback_rate_(0.0f),
packet_request_event_(true, false) {
DCHECK(io_loop_);
}
AudioRendererImpl::~AudioRendererImpl() {
}
bool AudioRendererImpl::IsMediaFormatSupported(
const media::MediaFormat& media_format) {
int channels;
int sample_rate;
int sample_bits;
return ParseMediaFormat(media_format, &channels, &sample_rate, &sample_bits);
}
bool AudioRendererImpl::OnInitialize(const media::MediaFormat& media_format) {
// Parse integer values in MediaFormat.
int channels;
int sample_rate;
int sample_bits;
if (!ParseMediaFormat(media_format, &channels, &sample_rate, &sample_bits)) {
return false;
}
// Create the audio output stream in browser process.
size_t packet_size = kSamplesPerBuffer * channels * sample_bits / 8;
io_loop_->PostTask(FROM_HERE,
NewRunnableMethod(this, &AudioRendererImpl::OnCreateStream,
AudioManager::AUDIO_PCM_LINEAR, channels, sample_rate, sample_bits,
packet_size));
return true;
}
void AudioRendererImpl::OnStop() {
AutoLock auto_lock(lock_);
if (stopped_)
return;
stopped_ = true;
io_loop_->PostTask(FROM_HERE,
NewRunnableMethod(this, &AudioRendererImpl::OnDestroy));
}
void AudioRendererImpl::OnReadComplete(media::Buffer* buffer_in) {
AutoLock auto_lock(lock_);
if (stopped_)
return;
// Use the base class to queue the buffer.
AudioRendererBase::OnReadComplete(buffer_in);
// Post a task to render thread to notify a packet reception.
io_loop_->PostTask(FROM_HERE,
NewRunnableMethod(this, &AudioRendererImpl::OnNotifyPacketReady));
}
void AudioRendererImpl::SetPlaybackRate(float rate) {
// TODO(hclam): This is silly. We should use a playback rate of != 1.0 to
// stop the audio stream. This does not work right now, so we just check
// for this in OnNotifyPacketReady().
playback_rate_ = rate;
}
void AudioRendererImpl::SetVolume(float volume) {
AutoLock auto_lock(lock_);
if (stopped_)
return;
// TODO(hclam): change this to multichannel if possible.
io_loop_->PostTask(FROM_HERE,
NewRunnableMethod(
this, &AudioRendererImpl::OnSetVolume, volume, volume));
}
void AudioRendererImpl::OnCreated(base::SharedMemoryHandle handle,
size_t length) {
DCHECK(MessageLoop::current() == io_loop_);
AutoLock auto_lock(lock_);
if (stopped_)
return;
shared_memory_.reset(new base::SharedMemory(handle, false));
shared_memory_->Map(length);
shared_memory_size_ = length;
filter_->Send(new ViewHostMsg_StartAudioStream(0, stream_id_));
}
void AudioRendererImpl::OnRequestPacket() {
DCHECK(MessageLoop::current() == io_loop_);
packet_request_event_.Signal();
// Try to fill in the fulfil the packet request.
OnNotifyPacketReady();
}
void AudioRendererImpl::OnStateChanged(AudioOutputStream::State state,
int info) {
DCHECK(MessageLoop::current() == io_loop_);
AutoLock auto_lock(lock_);
if (stopped_)
return;
switch (state) {
case AudioOutputStream::STATE_ERROR:
host_->Error(media::PIPELINE_ERROR_AUDIO_HARDWARE);
break;
// TODO(hclam): handle these events.
case AudioOutputStream::STATE_STARTED:
case AudioOutputStream::STATE_PAUSED:
break;
default:
NOTREACHED();
break;
}
}
void AudioRendererImpl::OnVolume(double left, double right) {
// TODO(hclam): decide whether we need to report the current volume to
// pipeline.
}
void AudioRendererImpl::OnCreateStream(
AudioManager::Format format, int channels, int sample_rate,
int bits_per_sample, size_t packet_size) {
DCHECK(MessageLoop::current() == io_loop_);
AutoLock auto_lock(lock_);
if (stopped_)
return;
// Make sure we don't call create more than once.
DCHECK_EQ(0, stream_id_);
stream_id_ = filter_->AddDelegate(this);
ViewHostMsg_Audio_CreateStream params;
params.format = format;
params.channels = channels;
params.sample_rate = sample_rate;
params.bits_per_sample = bits_per_sample;
params.packet_size = packet_size;
filter_->Send(new ViewHostMsg_CreateAudioStream(0, stream_id_, params));
}
void AudioRendererImpl::OnDestroy() {
DCHECK(MessageLoop::current() == io_loop_);
filter_->RemoveDelegate(stream_id_);
filter_->Send(new ViewHostMsg_CloseAudioStream(0, stream_id_));
}
void AudioRendererImpl::OnSetVolume(double left, double right) {
DCHECK(MessageLoop::current() == io_loop_);
AutoLock auto_lock(lock_);
if (stopped_)
return;
filter_->Send(new ViewHostMsg_SetAudioVolume(0, stream_id_, left, right));
}
void AudioRendererImpl::OnNotifyPacketReady() {
DCHECK(MessageLoop::current() == io_loop_);
AutoLock auto_lock(lock_);
if (stopped_)
return;
if (packet_request_event_.IsSignaled()) {
size_t filled = 0;
DCHECK(shared_memory_.get());
// TODO(hclam): This is a hack. The stream should be stopped.
if (playback_rate_ > 0.0f) {
filled = FillBuffer(static_cast<uint8*>(shared_memory_->memory()),
shared_memory_size_, playback_rate_);
} else {
memset(shared_memory_->memory(), 0, shared_memory_size_);
filled = shared_memory_size_;
}
if (filled > 0) {
packet_request_event_.Reset();
// Then tell browser process we are done filling into the buffer.
filter_->Send(
new ViewHostMsg_NotifyAudioPacketReady(0, stream_id_, filled));
}
}
}
|
