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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 // THREAD SAFETY | 5 // THREAD SAFETY |
6 // | 6 // |
7 // AlsaPcmOutputStream object is *not* thread-safe and should only be used | 7 // AlsaPcmOutputStream object is *not* thread-safe and should only be used |
8 // from the audio thread. We DCHECK on this assumption whenever we can. | 8 // from the audio thread. We DCHECK on this assumption whenever we can. |
9 // | 9 // |
10 // SEMANTICS OF Close() | 10 // SEMANTICS OF Close() |
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516 | 516 |
517 std::string AlsaPcmOutputStream::FindDeviceForChannels(uint32 channels) { | 517 std::string AlsaPcmOutputStream::FindDeviceForChannels(uint32 channels) { |
518 // Constants specified by the ALSA API for device hints. | 518 // Constants specified by the ALSA API for device hints. |
519 static const int kGetAllDevices = -1; | 519 static const int kGetAllDevices = -1; |
520 static const char kPcmInterfaceName[] = "pcm"; | 520 static const char kPcmInterfaceName[] = "pcm"; |
521 static const char kIoHintName[] = "IOID"; | 521 static const char kIoHintName[] = "IOID"; |
522 static const char kNameHintName[] = "NAME"; | 522 static const char kNameHintName[] = "NAME"; |
523 | 523 |
524 const char* wanted_device = GuessSpecificDeviceName(channels); | 524 const char* wanted_device = GuessSpecificDeviceName(channels); |
525 if (!wanted_device) | 525 if (!wanted_device) |
526 return ""; | 526 return std::string(); |
527 | 527 |
528 std::string guessed_device; | 528 std::string guessed_device; |
529 void** hints = NULL; | 529 void** hints = NULL; |
530 int error = wrapper_->DeviceNameHint(kGetAllDevices, | 530 int error = wrapper_->DeviceNameHint(kGetAllDevices, |
531 kPcmInterfaceName, | 531 kPcmInterfaceName, |
532 &hints); | 532 &hints); |
533 if (error == 0) { | 533 if (error == 0) { |
534 // NOTE: Do not early return from inside this if statement. The | 534 // NOTE: Do not early return from inside this if statement. The |
535 // hints above need to be freed. | 535 // hints above need to be freed. |
536 for (void** hint_iter = hints; *hint_iter != NULL; hint_iter++) { | 536 for (void** hint_iter = hints; *hint_iter != NULL; hint_iter++) { |
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758 } | 758 } |
759 | 759 |
760 // Changes the AudioSourceCallback to proxy calls to. Pass in NULL to | 760 // Changes the AudioSourceCallback to proxy calls to. Pass in NULL to |
761 // release ownership of the currently registered callback. | 761 // release ownership of the currently registered callback. |
762 void AlsaPcmOutputStream::set_source_callback(AudioSourceCallback* callback) { | 762 void AlsaPcmOutputStream::set_source_callback(AudioSourceCallback* callback) { |
763 DCHECK(IsOnAudioThread()); | 763 DCHECK(IsOnAudioThread()); |
764 source_callback_ = callback; | 764 source_callback_ = callback; |
765 } | 765 } |
766 | 766 |
767 } // namespace media | 767 } // namespace media |
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