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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 "media/audio/linux/audio_manager_linux.h" | 5 #include "media/audio/linux/audio_manager_linux.h" |
6 | 6 |
7 #include "base/command_line.h" | 7 #include "base/command_line.h" |
8 #include "base/environment.h" | 8 #include "base/environment.h" |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 #include "base/nix/xdg_util.h" | 10 #include "base/nix/xdg_util.h" |
11 #include "base/process_util.h" | 11 #include "base/process_util.h" |
12 #include "base/stl_util.h" | 12 #include "base/stl_util.h" |
| 13 #include "media/audio/audio_parameters.h" |
13 #include "media/audio/audio_output_dispatcher.h" | 14 #include "media/audio/audio_output_dispatcher.h" |
| 15 #include "media/audio/audio_util.h" |
14 #include "media/audio/linux/alsa_input.h" | 16 #include "media/audio/linux/alsa_input.h" |
15 #include "media/audio/linux/alsa_output.h" | 17 #include "media/audio/linux/alsa_output.h" |
16 #include "media/audio/linux/alsa_wrapper.h" | 18 #include "media/audio/linux/alsa_wrapper.h" |
17 #if defined(USE_PULSEAUDIO) | 19 #if defined(USE_PULSEAUDIO) |
18 #include "media/audio/pulse/pulse_output.h" | 20 #include "media/audio/pulse/pulse_output.h" |
19 #endif | 21 #endif |
20 #if defined(USE_CRAS) | 22 #if defined(USE_CRAS) |
21 #include "media/audio/linux/cras_input.h" | 23 #include "media/audio/linux/cras_input.h" |
22 #include "media/audio/linux/cras_output.h" | 24 #include "media/audio/linux/cras_output.h" |
23 #endif | 25 #endif |
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335 switches::kAlsaInputDevice); | 337 switches::kAlsaInputDevice); |
336 } | 338 } |
337 | 339 |
338 return new AlsaPcmInputStream(this, device_name, params, wrapper_.get()); | 340 return new AlsaPcmInputStream(this, device_name, params, wrapper_.get()); |
339 } | 341 } |
340 | 342 |
341 AudioManager* CreateAudioManager() { | 343 AudioManager* CreateAudioManager() { |
342 return new AudioManagerLinux(); | 344 return new AudioManagerLinux(); |
343 } | 345 } |
344 | 346 |
| 347 AudioParameters AudioManagerLinux::GetPreferredLowLatencyOutputStreamParameters( |
| 348 const AudioParameters& input_params) { |
| 349 // Since Linux doesn't actually have a low latency path the hardware buffer |
| 350 // size is quite large in order to prevent glitches with general usage. Some |
| 351 // clients, such as WebRTC, have a more limited use case and work acceptably |
| 352 // with a smaller buffer size. The check below allows clients which want to |
| 353 // try a smaller buffer size on Linux to do so. |
| 354 int buffer_size = std::min( |
| 355 static_cast<size_t>(input_params.frames_per_buffer()), |
| 356 GetAudioHardwareBufferSize()); |
| 357 |
| 358 // TODO(dalecurtis): This should include bits per channel and channel layout |
| 359 // eventually. |
| 360 return AudioParameters( |
| 361 AudioParameters::AUDIO_PCM_LOW_LATENCY, input_params.channel_layout(), |
| 362 GetAudioHardwareSampleRate(), 16, buffer_size); |
| 363 } |
| 364 |
345 } // namespace media | 365 } // namespace media |
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