Public Member Functions | |
| virtual size_t | bufferSize () const =0 |
| returns size of output buffer - eg. | |
| virtual int | channelCount () const =0 |
| return number of output audio channels. | |
| virtual status_t | dump (int fd, const Vector< String16 > &args)=0 |
| dump the state of the audio output device | |
| virtual int | format () const =0 |
| return audio format in 8bit or 16bit PCM format - eg. | |
| uint32_t | frameSize () const |
| return the frame size (number of bytes per sample). | |
| virtual uint32_t | latency () const =0 |
| return the audio hardware driver latency in milli seconds. | |
| virtual uint32_t | sampleRate () const =0 |
| return audio sampling rate in hz - eg. | |
| virtual status_t | setVolume (float volume)=0 |
| Use this method in situations where audio mixing is done in the hardware. | |
| virtual status_t | standby ()=0 |
| Put the audio hardware output into standby mode. | |
| virtual ssize_t | write (const void *buffer, size_t bytes)=0 |
| write audio buffer to driver. | |
| virtual | ~AudioStreamOut ()=0 |
It provides information about various properties of the audio output hardware driver.
Definition at line 40 of file AudioHardwareInterface.h.
| virtual android::AudioStreamOut::~AudioStreamOut | ( | ) | [pure virtual] |
| virtual size_t android::AudioStreamOut::bufferSize | ( | ) | const [pure virtual] |
returns size of output buffer - eg.
4800
| virtual int android::AudioStreamOut::channelCount | ( | ) | const [pure virtual] |
return number of output audio channels.
Acceptable values are 1 (mono) or 2 (stereo)
| virtual status_t android::AudioStreamOut::dump | ( | int | fd, | |
| const Vector< String16 > & | args | |||
| ) | [pure virtual] |
dump the state of the audio output device
| virtual int android::AudioStreamOut::format | ( | ) | const [pure virtual] |
return audio format in 8bit or 16bit PCM format - eg.
AudioSystem:PCM_16_BIT
| uint32_t android::AudioStreamOut::frameSize | ( | ) | const [inline] |
return the frame size (number of bytes per sample).
Definition at line 65 of file AudioHardwareInterface.h.
References channelCount(), and format().
| virtual uint32_t android::AudioStreamOut::latency | ( | ) | const [pure virtual] |
return the audio hardware driver latency in milli seconds.
| virtual uint32_t android::AudioStreamOut::sampleRate | ( | ) | const [pure virtual] |
return audio sampling rate in hz - eg.
44100
| virtual status_t android::AudioStreamOut::setVolume | ( | float | volume | ) | [pure virtual] |
Use this method in situations where audio mixing is done in the hardware.
This method serves as a direct interface with hardware, allowing you to directly set the volume as apposed to via the framework. This method might produce multiple PCM outputs or hardware accelerated codecs, such as MP3 or AAC.
| virtual status_t android::AudioStreamOut::standby | ( | ) | [pure virtual] |
Put the audio hardware output into standby mode.
Returns status based on include/utils/Errors.h
| virtual ssize_t android::AudioStreamOut::write | ( | const void * | buffer, | |
| size_t | bytes | |||
| ) | [pure virtual] |
write audio buffer to driver.
Returns number of bytes written