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| 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/filters/reference_audio_renderer.h" | |
| 6 | |
| 7 #include <math.h> | |
| 8 | |
| 9 #include "base/bind.h" | |
| 10 #include "base/synchronization/waitable_event.h" | |
| 11 | |
| 12 namespace media { | |
| 13 | |
| 14 ReferenceAudioRenderer::ReferenceAudioRenderer(AudioManager* audio_manager) | |
| 15 : AudioRendererBase(), | |
| 16 audio_manager_(audio_manager), | |
| 17 bytes_per_second_(0), | |
| 18 buffer_capacity_(0) { | |
| 19 } | |
| 20 | |
| 21 ReferenceAudioRenderer::~ReferenceAudioRenderer() { | |
| 22 // Close down the audio device. | |
| 23 if (controller_) { | |
| 24 base::WaitableEvent closed_event(true, false); | |
| 25 controller_->Close(base::Bind(&base::WaitableEvent::Signal, | |
| 26 base::Unretained(&closed_event))); | |
| 27 closed_event.Wait(); | |
| 28 } | |
| 29 } | |
| 30 | |
| 31 void ReferenceAudioRenderer::SetPlaybackRate(float rate) { | |
| 32 // TODO(fbarchard): limit rate to reasonable values | |
| 33 AudioRendererBase::SetPlaybackRate(rate); | |
| 34 | |
| 35 if (controller_ && rate > 0.0f) | |
| 36 controller_->Play(); | |
| 37 } | |
| 38 | |
| 39 void ReferenceAudioRenderer::SetVolume(float volume) { | |
| 40 if (controller_) | |
| 41 controller_->SetVolume(volume); | |
| 42 } | |
| 43 | |
| 44 void ReferenceAudioRenderer::OnCreated(AudioOutputController* controller) { | |
| 45 NOTIMPLEMENTED(); | |
| 46 } | |
| 47 | |
| 48 void ReferenceAudioRenderer::OnPlaying(AudioOutputController* controller) { | |
| 49 NOTIMPLEMENTED(); | |
| 50 } | |
| 51 | |
| 52 void ReferenceAudioRenderer::OnPaused(AudioOutputController* controller) { | |
| 53 NOTIMPLEMENTED(); | |
| 54 } | |
| 55 | |
| 56 void ReferenceAudioRenderer::OnError(AudioOutputController* controller, | |
| 57 int error_code) { | |
| 58 NOTIMPLEMENTED(); | |
| 59 } | |
| 60 | |
| 61 void ReferenceAudioRenderer::OnMoreData(AudioOutputController* controller, | |
| 62 AudioBuffersState buffers_state) { | |
| 63 // TODO(fbarchard): Waveout_output_win.h should handle zero length buffers | |
| 64 // without clicking. | |
| 65 uint32 pending_bytes = static_cast<uint32>(ceil(buffers_state.total_bytes() * | |
| 66 GetPlaybackRate())); | |
| 67 base::TimeDelta delay = base::TimeDelta::FromMicroseconds( | |
| 68 base::Time::kMicrosecondsPerSecond * pending_bytes / | |
| 69 bytes_per_second_); | |
| 70 bool buffers_empty = buffers_state.pending_bytes == 0; | |
| 71 uint32 read = FillBuffer(buffer_.get(), buffer_capacity_, delay, | |
| 72 buffers_empty); | |
| 73 controller->EnqueueData(buffer_.get(), read); | |
| 74 } | |
| 75 | |
| 76 bool ReferenceAudioRenderer::OnInitialize(int bits_per_channel, | |
| 77 ChannelLayout channel_layout, | |
| 78 int sample_rate) { | |
| 79 int samples_per_packet = sample_rate / 10; | |
| 80 int hardware_buffer_size = samples_per_packet * | |
| 81 ChannelLayoutToChannelCount(channel_layout) * bits_per_channel / 8; | |
| 82 | |
| 83 // Allocate audio buffer based on hardware buffer size. | |
| 84 buffer_capacity_ = 3 * hardware_buffer_size; | |
| 85 buffer_.reset(new uint8[buffer_capacity_]); | |
| 86 | |
| 87 AudioParameters params(AudioParameters::AUDIO_PCM_LINEAR, channel_layout, | |
| 88 sample_rate, bits_per_channel, samples_per_packet); | |
| 89 bytes_per_second_ = params.GetBytesPerSecond(); | |
| 90 | |
| 91 controller_ = AudioOutputController::Create(audio_manager_, this, params, | |
| 92 buffer_capacity_); | |
| 93 return controller_ != NULL; | |
| 94 } | |
| 95 | |
| 96 void ReferenceAudioRenderer::OnStop() { | |
| 97 if (controller_) | |
| 98 controller_->Pause(); | |
| 99 } | |
| 100 | |
| 101 } // namespace media | |
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Chromium Code Reviews
Issue 9121062:
Remove "high"-latency audio code path (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src