diff options
Diffstat (limited to 'chromium/media/audio/audio_manager.h')
| -rw-r--r-- | chromium/media/audio/audio_manager.h | 39 |
1 files changed, 35 insertions, 4 deletions
diff --git a/chromium/media/audio/audio_manager.h b/chromium/media/audio/audio_manager.h index cc5b95c8197..891d2a26589 100644 --- a/chromium/media/audio/audio_manager.h +++ b/chromium/media/audio/audio_manager.h @@ -58,11 +58,16 @@ class MEDIA_EXPORT AudioManager { // threads to avoid blocking the rest of the application. virtual void ShowAudioInputSettings() = 0; - // Appends a list of available input devices. It is not guaranteed that - // all the devices in the list support all formats and sample rates for + // Appends a list of available input devices to |device_names|, + // which must initially be empty. It is not guaranteed that all the + // devices in the list support all formats and sample rates for // recording. virtual void GetAudioInputDeviceNames(AudioDeviceNames* device_names) = 0; + // Appends a list of available output devices to |device_names|, + // which must initially be empty. + virtual void GetAudioOutputDeviceNames(AudioDeviceNames* device_names) = 0; + // Factory for all the supported stream formats. |params| defines parameters // of the audio stream to be created. // @@ -71,6 +76,14 @@ class MEDIA_EXPORT AudioManager { // or three buffers are created, one will be locked for playback and one will // be ready to be filled in the call to AudioSourceCallback::OnMoreData(). // + // To create a stream for the default output device, pass an empty string + // for |device_id|, otherwise the specified audio device will be opened. + // + // The |input_device_id| is used for low-latency unified streams + // (input+output) only and then only if the audio parameters specify a >0 + // input channel count. In other cases this id is ignored and should be + // empty. + // // Returns NULL if the combination of the parameters is not supported, or if // we have reached some other platform specific limit. // @@ -82,14 +95,18 @@ class MEDIA_EXPORT AudioManager { // // Do not free the returned AudioOutputStream. It is owned by AudioManager. virtual AudioOutputStream* MakeAudioOutputStream( - const AudioParameters& params, const std::string& input_device_id) = 0; + const AudioParameters& params, + const std::string& device_id, + const std::string& input_device_id) = 0; // Creates new audio output proxy. A proxy implements // AudioOutputStream interface, but unlike regular output stream // created with MakeAudioOutputStream() it opens device only when a // sound is actually playing. virtual AudioOutputStream* MakeAudioOutputStreamProxy( - const AudioParameters& params, const std::string& input_device_id) = 0; + const AudioParameters& params, + const std::string& device_id, + const std::string& input_device_id) = 0; // Factory to create audio recording streams. // |channels| can be 1 or 2. @@ -130,14 +147,28 @@ class MEDIA_EXPORT AudioManager { // streams. It is a convenience interface to // AudioManagerBase::GetPreferredOutputStreamParameters and each AudioManager // does not need their own implementation to this interface. + // TODO(tommi): Remove this method and use GetOutputStreamParameteres instead. virtual AudioParameters GetDefaultOutputStreamParameters() = 0; + // Returns the output hardware audio parameters for a specific output device. + virtual AudioParameters GetOutputStreamParameters( + const std::string& device_id) = 0; + // Returns the input hardware audio parameters of the specific device // for opening input streams. Each AudioManager needs to implement their own // version of this interface. virtual AudioParameters GetInputStreamParameters( const std::string& device_id) = 0; + // Returns the device id of an output device that belongs to the same hardware + // as the specified input device. + // If the hardware has only an input device (e.g. a webcam), the return value + // will be empty (which the caller can then interpret to be the default output + // device). Implementations that don't yet support this feature, must return + // an empty string. + virtual std::string GetAssociatedOutputDeviceID( + const std::string& input_device_id) = 0; + protected: AudioManager(); |