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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "content/renderer/media/audio_renderer_impl.h" | 5 #include "content/renderer/media/audio_renderer_impl.h" |
6 | 6 |
7 #include <math.h> | 7 #include <math.h> |
8 | 8 |
9 #include <algorithm> | 9 #include <algorithm> |
10 | 10 |
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53 } | 53 } |
54 } | 54 } |
55 | 55 |
56 bool AudioRendererImpl::OnInitialize(int bits_per_channel, | 56 bool AudioRendererImpl::OnInitialize(int bits_per_channel, |
57 ChannelLayout channel_layout, | 57 ChannelLayout channel_layout, |
58 int sample_rate) { | 58 int sample_rate) { |
59 // We use the AUDIO_PCM_LINEAR flag because AUDIO_PCM_LOW_LATENCY | 59 // We use the AUDIO_PCM_LINEAR flag because AUDIO_PCM_LOW_LATENCY |
60 // does not currently support all the sample-rates that we require. | 60 // does not currently support all the sample-rates that we require. |
61 // Please see: http://code.google.com/p/chromium/issues/detail?id=103627 | 61 // Please see: http://code.google.com/p/chromium/issues/detail?id=103627 |
62 // for more details. | 62 // for more details. |
63 audio_parameters_ = AudioParameters(AudioParameters::AUDIO_PCM_LINEAR, | 63 audio_parameters_.Reset( |
64 channel_layout, | 64 AudioParameters::AUDIO_PCM_LINEAR, |
65 sample_rate, | 65 channel_layout, sample_rate, bits_per_channel, |
66 bits_per_channel, | 66 audio_hardware::GetHighLatencyOutputBufferSize(sample_rate)); |
67 0); | |
68 | 67 |
69 bytes_per_second_ = audio_parameters_.GetBytesPerSecond(); | 68 bytes_per_second_ = audio_parameters_.GetBytesPerSecond(); |
70 | 69 |
71 DCHECK(sink_.get()); | 70 DCHECK(sink_.get()); |
72 | 71 |
73 if (!is_initialized_) { | 72 if (!is_initialized_) { |
74 sink_->Initialize( | 73 sink_->Initialize(audio_parameters_, this); |
75 audio_hardware::GetHighLatencyOutputBufferSize(sample_rate), | |
76 audio_parameters_.channels, | |
77 audio_parameters_.sample_rate, | |
78 audio_parameters_.format, | |
79 this); | |
80 | 74 |
81 sink_->Start(); | 75 sink_->Start(); |
82 is_initialized_ = true; | 76 is_initialized_ = true; |
83 return true; | 77 return true; |
84 } | 78 } |
85 | 79 |
86 return false; | 80 return false; |
87 } | 81 } |
88 | 82 |
89 void AudioRendererImpl::OnStop() { | 83 void AudioRendererImpl::OnStop() { |
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186 base::TimeDelta request_delay = | 180 base::TimeDelta request_delay = |
187 base::TimeDelta::FromMilliseconds(audio_delay_milliseconds); | 181 base::TimeDelta::FromMilliseconds(audio_delay_milliseconds); |
188 | 182 |
189 // Finally we need to adjust the delay according to playback rate. | 183 // Finally we need to adjust the delay according to playback rate. |
190 if (GetPlaybackRate() != 1.0f) { | 184 if (GetPlaybackRate() != 1.0f) { |
191 request_delay = base::TimeDelta::FromMicroseconds( | 185 request_delay = base::TimeDelta::FromMicroseconds( |
192 static_cast<int64>(ceil(request_delay.InMicroseconds() * | 186 static_cast<int64>(ceil(request_delay.InMicroseconds() * |
193 GetPlaybackRate()))); | 187 GetPlaybackRate()))); |
194 } | 188 } |
195 | 189 |
196 uint32 bytes_per_frame = | 190 int bytes_per_frame = audio_parameters_.GetBytesPerFrame(); |
197 audio_parameters_.bits_per_sample * audio_parameters_.channels / 8; | |
198 | 191 |
199 const size_t buf_size = number_of_frames * bytes_per_frame; | 192 const size_t buf_size = number_of_frames * bytes_per_frame; |
200 scoped_array<uint8> buf(new uint8[buf_size]); | 193 scoped_array<uint8> buf(new uint8[buf_size]); |
201 | 194 |
202 uint32 frames_filled = FillBuffer(buf.get(), number_of_frames, request_delay); | 195 uint32 frames_filled = FillBuffer(buf.get(), number_of_frames, request_delay); |
203 uint32 bytes_filled = frames_filled * bytes_per_frame; | 196 uint32 bytes_filled = frames_filled * bytes_per_frame; |
204 DCHECK_LE(bytes_filled, buf_size); | 197 DCHECK_LE(bytes_filled, buf_size); |
205 UpdateEarliestEndTime(bytes_filled, request_delay, base::Time::Now()); | 198 UpdateEarliestEndTime(bytes_filled, request_delay, base::Time::Now()); |
206 | 199 |
207 // Deinterleave each audio channel. | 200 // Deinterleave each audio channel. |
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227 | 220 |
228 void AudioRendererImpl::OnRenderError() { | 221 void AudioRendererImpl::OnRenderError() { |
229 host()->DisableAudioRenderer(); | 222 host()->DisableAudioRenderer(); |
230 } | 223 } |
231 | 224 |
232 void AudioRendererImpl::OnRenderEndOfStream() { | 225 void AudioRendererImpl::OnRenderEndOfStream() { |
233 // TODO(enal): schedule callback instead of polling. | 226 // TODO(enal): schedule callback instead of polling. |
234 if (base::Time::Now() >= earliest_end_time_) | 227 if (base::Time::Now() >= earliest_end_time_) |
235 SignalEndOfStream(); | 228 SignalEndOfStream(); |
236 } | 229 } |
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