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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 // Software adjust volume of samples, allows each audio stream its own | 5 // Software adjust volume of samples, allows each audio stream its own |
6 // volume without impacting master volume for chrome and other applications. | 6 // volume without impacting master volume for chrome and other applications. |
7 | 7 |
8 // Implemented as templates to allow 8, 16 and 32 bit implementations. | 8 // Implemented as templates to allow 8, 16 and 32 bit implementations. |
9 // 8 bit is unsigned and biased by 128. | 9 // 8 bit is unsigned and biased by 128. |
10 | 10 |
11 // TODO(vrk): This file has been running pretty wild and free, and it's likely | 11 // TODO(vrk): This file has been running pretty wild and free, and it's likely |
12 // that a lot of the functions can be simplified and made more elegant. Revisit | 12 // that a lot of the functions can be simplified and made more elegant. Revisit |
13 // after other audio cleanup is done. (crbug.com/120319) | 13 // after other audio cleanup is done. (crbug.com/120319) |
14 | 14 |
15 #include <algorithm> | 15 #include <algorithm> |
16 #include <limits> | 16 #include <limits> |
17 | 17 |
18 #include "base/atomicops.h" | 18 #include "base/atomicops.h" |
19 #include "base/basictypes.h" | 19 #include "base/basictypes.h" |
20 #include "base/logging.h" | 20 #include "base/logging.h" |
21 #include "base/shared_memory.h" | 21 #include "base/shared_memory.h" |
22 #include "base/time.h" | 22 #include "base/time.h" |
23 #if defined(OS_WIN) | |
24 #include "base/sys_info.h" | |
25 #include "base/win/windows_version.h" | |
26 #include "media/audio/audio_manager_base.h" | |
27 #endif | |
28 #include "media/audio/audio_parameters.h" | 23 #include "media/audio/audio_parameters.h" |
29 #include "media/audio/audio_util.h" | 24 #include "media/audio/audio_util.h" |
| 25 |
30 #if defined(OS_MACOSX) | 26 #if defined(OS_MACOSX) |
31 #include "media/audio/mac/audio_low_latency_input_mac.h" | 27 #include "media/audio/mac/audio_low_latency_input_mac.h" |
32 #include "media/audio/mac/audio_low_latency_output_mac.h" | 28 #include "media/audio/mac/audio_low_latency_output_mac.h" |
33 #endif | 29 #elif defined(OS_WIN) |
34 #if defined(OS_WIN) | 30 #include "base/command_line.h" |
| 31 #include "base/sys_info.h" |
| 32 #include "base/win/windows_version.h" |
35 #include "media/audio/win/audio_low_latency_input_win.h" | 33 #include "media/audio/win/audio_low_latency_input_win.h" |
36 #include "media/audio/win/audio_low_latency_output_win.h" | 34 #include "media/audio/win/audio_low_latency_output_win.h" |
| 35 #include "media/audio/audio_manager_base.h" |
| 36 #include "media/base/media_switches.h" |
37 #endif | 37 #endif |
38 | 38 |
39 using base::subtle::Atomic32; | 39 using base::subtle::Atomic32; |
40 | 40 |
41 const uint32 kUnknownDataSize = static_cast<uint32>(-1); | 41 const uint32 kUnknownDataSize = static_cast<uint32>(-1); |
42 | 42 |
43 namespace media { | 43 namespace media { |
44 | 44 |
45 // TODO(fbarchard): Convert to intrinsics for better efficiency. | 45 // TODO(fbarchard): Convert to intrinsics for better efficiency. |
46 template<class Fixed> | 46 template<class Fixed> |
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344 #if defined(OS_MACOSX) | 344 #if defined(OS_MACOSX) |
345 // Hardware sample-rate on the Mac can be configured, so we must query. | 345 // Hardware sample-rate on the Mac can be configured, so we must query. |
346 return AUAudioOutputStream::HardwareSampleRate(); | 346 return AUAudioOutputStream::HardwareSampleRate(); |
347 #elif defined(OS_WIN) | 347 #elif defined(OS_WIN) |
348 if (!IsWASAPISupported()) { | 348 if (!IsWASAPISupported()) { |
349 // Fall back to Windows Wave implementation on Windows XP or lower | 349 // Fall back to Windows Wave implementation on Windows XP or lower |
350 // and use 48kHz as default input sample rate. | 350 // and use 48kHz as default input sample rate. |
351 return 48000; | 351 return 48000; |
352 } | 352 } |
353 | 353 |
| 354 // TODO(crogers): tune this rate for best possible WebAudio performance. |
| 355 // WebRTC works well at 48kHz and a buffer size of 480 samples will be used |
| 356 // for this case. Note that exclusive mode is experimental. |
| 357 const CommandLine* cmd_line = CommandLine::ForCurrentProcess(); |
| 358 if (cmd_line->HasSwitch(switches::kEnableExclusiveMode)) { |
| 359 // This sample rate will be combined with a buffer size of 256 samples |
| 360 // (see GetAudioHardwareBufferSize()), which corresponds to an output |
| 361 // delay of ~5.33ms. |
| 362 return 48000; |
| 363 } |
| 364 |
354 // Hardware sample-rate on Windows can be configured, so we must query. | 365 // Hardware sample-rate on Windows can be configured, so we must query. |
355 // TODO(henrika): improve possibility to specify audio endpoint. | 366 // TODO(henrika): improve possibility to specify an audio endpoint. |
356 // Use the default device (same as for Wave) for now to be compatible. | 367 // Use the default device (same as for Wave) for now to be compatible |
| 368 // or possibly remove the ERole argument completely until it is in use. |
357 return WASAPIAudioOutputStream::HardwareSampleRate(eConsole); | 369 return WASAPIAudioOutputStream::HardwareSampleRate(eConsole); |
358 #elif defined(OS_ANDROID) | 370 #elif defined(OS_ANDROID) |
359 return 16000; | 371 return 16000; |
360 #else | 372 #else |
361 // Hardware for Linux is nearly always 48KHz. | 373 // Hardware for Linux is nearly always 48KHz. |
362 // TODO(crogers) : return correct value in rare non-48KHz cases. | 374 // TODO(crogers) : return correct value in rare non-48KHz cases. |
363 return 48000; | 375 return 48000; |
364 #endif | 376 #endif |
365 } | 377 } |
366 | 378 |
367 int GetAudioInputHardwareSampleRate(const std::string& device_id) { | 379 int GetAudioInputHardwareSampleRate(const std::string& device_id) { |
368 // TODO(henrika): add support for device selection on all platforms. | 380 // TODO(henrika): add support for device selection on all platforms. |
369 // Only exists on Windows today. | 381 // Only exists on Windows today. |
370 #if defined(OS_MACOSX) | 382 #if defined(OS_MACOSX) |
371 return AUAudioInputStream::HardwareSampleRate(); | 383 return AUAudioInputStream::HardwareSampleRate(); |
372 #elif defined(OS_WIN) | 384 #elif defined(OS_WIN) |
373 if (!IsWASAPISupported()) { | 385 if (!IsWASAPISupported()) { |
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390 // Core Audio API, so a low buffer size is possible. For Linux, further | 402 // Core Audio API, so a low buffer size is possible. For Linux, further |
391 // tuning may be needed. | 403 // tuning may be needed. |
392 #if defined(OS_MACOSX) | 404 #if defined(OS_MACOSX) |
393 return 128; | 405 return 128; |
394 #elif defined(OS_WIN) | 406 #elif defined(OS_WIN) |
395 if (!IsWASAPISupported()) { | 407 if (!IsWASAPISupported()) { |
396 // Fall back to Windows Wave implementation on Windows XP or lower | 408 // Fall back to Windows Wave implementation on Windows XP or lower |
397 // and assume 48kHz as default sample rate. | 409 // and assume 48kHz as default sample rate. |
398 return 2048; | 410 return 2048; |
399 } | 411 } |
| 412 |
| 413 // TODO(crogers): tune this size to best possible WebAudio performance. |
| 414 // WebRTC always uses 10ms for Windows and does not call this method. |
| 415 // Note that exclusive mode is experimental. |
| 416 const CommandLine* cmd_line = CommandLine::ForCurrentProcess(); |
| 417 if (cmd_line->HasSwitch(switches::kEnableExclusiveMode)) { |
| 418 return 256; |
| 419 } |
| 420 |
400 // This call must be done on a COM thread configured as MTA. | 421 // This call must be done on a COM thread configured as MTA. |
401 // TODO(tommi): http://code.google.com/p/chromium/issues/detail?id=103835. | 422 // TODO(tommi): http://code.google.com/p/chromium/issues/detail?id=103835. |
402 int mixing_sample_rate = | 423 int mixing_sample_rate = |
403 WASAPIAudioOutputStream::HardwareSampleRate(eConsole); | 424 WASAPIAudioOutputStream::HardwareSampleRate(eConsole); |
404 if (mixing_sample_rate == 48000) | 425 if (mixing_sample_rate == 48000) |
405 return 480; | 426 return 480; |
406 else if (mixing_sample_rate == 44100) | 427 else if (mixing_sample_rate == 44100) |
407 return 448; | 428 return 448; |
408 else | 429 else |
409 return 960; | 430 return 960; |
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530 if ((base::SysInfo::NumberOfProcessors() < 2) || | 551 if ((base::SysInfo::NumberOfProcessors() < 2) || |
531 (base::win::GetVersion() == base::win::VERSION_VISTA)) { | 552 (base::win::GetVersion() == base::win::VERSION_VISTA)) { |
532 return 3; | 553 return 3; |
533 } | 554 } |
534 return 2; | 555 return 2; |
535 } | 556 } |
536 | 557 |
537 #endif | 558 #endif |
538 | 559 |
539 } // namespace media | 560 } // namespace media |
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