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| 1 // Copyright 2015 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 "chromecast/media/audio/audio_manager.h" |
| 6 |
| 7 #include "chromecast/base/task_runner_impl.h" |
| 8 #include "chromecast/media/audio/audio_output_stream.h" |
| 9 #include "chromecast/public/cast_media_shlib.h" |
| 10 #include "chromecast/public/media/media_pipeline_backend.h" |
| 11 #include "chromecast/public/media/media_pipeline_device_params.h" |
| 12 |
| 13 namespace { |
| 14 const int kDefaultSampleRate = 48000; |
| 15 |
| 16 // Define bounds for the output buffer size (in frames). |
| 17 // Note: These values are copied from AudioManagerPulse implementation. |
| 18 static const int kMinimumOutputBufferSize = 512; |
| 19 static const int kMaximumOutputBufferSize = 8192; |
| 20 static const int kDefaultOutputBufferSize = 2048; |
| 21 } // namespace |
| 22 |
| 23 namespace chromecast { |
| 24 namespace media { |
| 25 |
| 26 AudioManager::AudioManager(::media::AudioLogFactory* audio_log_factory) |
| 27 : AudioManagerBase(audio_log_factory) {} |
| 28 |
| 29 AudioManager::~AudioManager() { |
| 30 Shutdown(); |
| 31 } |
| 32 |
| 33 bool AudioManager::HasAudioOutputDevices() { |
| 34 return true; |
| 35 } |
| 36 |
| 37 bool AudioManager::HasAudioInputDevices() { |
| 38 return false; |
| 39 } |
| 40 |
| 41 void AudioManager::ShowAudioInputSettings() { |
| 42 LOG(WARNING) << "No support for input audio devices"; |
| 43 } |
| 44 |
| 45 void AudioManager::GetAudioInputDeviceNames( |
| 46 ::media::AudioDeviceNames* device_names) { |
| 47 DCHECK(device_names->empty()); |
| 48 LOG(WARNING) << "No support for input audio devices"; |
| 49 } |
| 50 |
| 51 ::media::AudioParameters AudioManager::GetInputStreamParameters( |
| 52 const std::string& device_id) { |
| 53 LOG(WARNING) << "No support for input audio devices"; |
| 54 // Need to send a valid AudioParameters object even when it will unused. |
| 55 return ::media::AudioParameters( |
| 56 ::media::AudioParameters::AUDIO_PCM_LOW_LATENCY, |
| 57 ::media::CHANNEL_LAYOUT_STEREO, 48000, 16, 1024); |
| 58 } |
| 59 |
| 60 scoped_ptr<MediaPipelineBackend> AudioManager::CreateMediaPipelineBackend() { |
| 61 if (!audio_task_runner_) |
| 62 audio_task_runner_.reset(new TaskRunnerImpl()); |
| 63 |
| 64 MediaPipelineDeviceParams device_params( |
| 65 MediaPipelineDeviceParams::kModeIgnorePts, audio_task_runner_.get()); |
| 66 return scoped_ptr<MediaPipelineBackend>( |
| 67 CastMediaShlib::CreateMediaPipelineBackend(device_params)); |
| 68 } |
| 69 |
| 70 ::media::AudioOutputStream* AudioManager::MakeLinearOutputStream( |
| 71 const ::media::AudioParameters& params) { |
| 72 DCHECK_EQ(::media::AudioParameters::AUDIO_PCM_LINEAR, params.format()); |
| 73 return new AudioOutputStream(params, this); |
| 74 } |
| 75 |
| 76 ::media::AudioOutputStream* AudioManager::MakeLowLatencyOutputStream( |
| 77 const ::media::AudioParameters& params, |
| 78 const std::string& device_id) { |
| 79 DCHECK_EQ(::media::AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format()); |
| 80 return new AudioOutputStream(params, this); |
| 81 } |
| 82 |
| 83 ::media::AudioInputStream* AudioManager::MakeLinearInputStream( |
| 84 const ::media::AudioParameters& params, |
| 85 const std::string& device_id) { |
| 86 LOG(WARNING) << "No support for input audio devices"; |
| 87 return nullptr; |
| 88 } |
| 89 |
| 90 ::media::AudioInputStream* AudioManager::MakeLowLatencyInputStream( |
| 91 const ::media::AudioParameters& params, |
| 92 const std::string& device_id) { |
| 93 LOG(WARNING) << "No support for input audio devices"; |
| 94 return nullptr; |
| 95 } |
| 96 |
| 97 ::media::AudioParameters AudioManager::GetPreferredOutputStreamParameters( |
| 98 const std::string& output_device_id, |
| 99 const ::media::AudioParameters& input_params) { |
| 100 ::media::ChannelLayout channel_layout = ::media::CHANNEL_LAYOUT_STEREO; |
| 101 int sample_rate = kDefaultSampleRate; |
| 102 int buffer_size = kDefaultOutputBufferSize; |
| 103 int bits_per_sample = 16; |
| 104 if (input_params.IsValid()) { |
| 105 // Do not change: |
| 106 // - the channel layout |
| 107 // - the number of bits per sample |
| 108 // We support stereo only with 16 bits per sample. |
| 109 sample_rate = input_params.sample_rate(); |
| 110 buffer_size = std::min( |
| 111 kMaximumOutputBufferSize, |
| 112 std::max(kMinimumOutputBufferSize, input_params.frames_per_buffer())); |
| 113 } |
| 114 |
| 115 ::media::AudioParameters output_params( |
| 116 ::media::AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout, |
| 117 sample_rate, bits_per_sample, buffer_size); |
| 118 return output_params; |
| 119 } |
| 120 |
| 121 } // namespace media |
| 122 } // namespace chromecast |
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