AudioStreamOut is the abstraction interface for the audio output hardware.
More...
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| virtual size_t | bufferSize () const =0 |
| | returns size of output buffer - eg. More...
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| virtual uint32_t | channels () const =0 |
| | returns the output channel nask More...
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| virtual status_t | dump (int fd, const Vector< String16 > &args)=0 |
| | dump the state of the audio output device More...
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| virtual int | format () const =0 |
| | return audio format in 8bit or 16bit PCM format - eg. More...
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| uint32_t | frameSize () const |
| | return the frame size (number of bytes per sample). More...
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| virtual String8 | getParameters (const String8 &keys)=0 |
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| virtual status_t | getRenderPosition (uint32_t *dspFrames)=0 |
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| virtual uint32_t | latency () const =0 |
| | return the audio hardware driver latency in milli seconds. More...
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| virtual uint32_t | sampleRate () const =0 |
| | return audio sampling rate in hz - eg. More...
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| virtual status_t | setParameters (const String8 &keyValuePairs)=0 |
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| virtual status_t | setVolume (float left, float right)=0 |
| | Use this method in situations where audio mixing is done in the hardware. More...
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| virtual status_t | standby ()=0 |
| | Put the audio hardware output into standby mode. More...
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| virtual ssize_t | write (const void *buffer, size_t bytes)=0 |
| | write audio buffer to driver. More...
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| virtual | ~AudioStreamOut ()=0 |
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AudioStreamOut is the abstraction interface for the audio output hardware.
It provides information about various properties of the audio output hardware driver.
Definition at line 48 of file AudioHardwareInterface.h.
| virtual android_audio_legacy::AudioStreamOut::~AudioStreamOut |
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| ) |
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pure virtual |
| virtual size_t android_audio_legacy::AudioStreamOut::bufferSize |
( |
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const |
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pure virtual |
returns size of output buffer - eg.
4800
| virtual uint32_t android_audio_legacy::AudioStreamOut::channels |
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const |
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pure virtual |
returns the output channel nask
| virtual status_t android_audio_legacy::AudioStreamOut::dump |
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int |
fd, |
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const Vector< String16 > & |
args |
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) |
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pure virtual |
dump the state of the audio output device
| virtual int android_audio_legacy::AudioStreamOut::format |
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const |
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pure virtual |
return audio format in 8bit or 16bit PCM format - eg.
AudioSystem:PCM_16_BIT
| uint32_t android_audio_legacy::AudioStreamOut::frameSize |
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const |
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inline |
| virtual String8 android_audio_legacy::AudioStreamOut::getParameters |
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const String8 & |
keys | ) |
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pure virtual |
| virtual status_t android_audio_legacy::AudioStreamOut::getRenderPosition |
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uint32_t * |
dspFrames | ) |
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pure virtual |
| virtual uint32_t android_audio_legacy::AudioStreamOut::latency |
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const |
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pure virtual |
return the audio hardware driver latency in milli seconds.
| virtual uint32_t android_audio_legacy::AudioStreamOut::sampleRate |
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const |
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pure virtual |
return audio sampling rate in hz - eg.
44100
| virtual status_t android_audio_legacy::AudioStreamOut::setParameters |
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const String8 & |
keyValuePairs | ) |
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pure virtual |
| virtual status_t android_audio_legacy::AudioStreamOut::setVolume |
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float |
left, |
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float |
right |
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) |
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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_audio_legacy::AudioStreamOut::standby |
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pure virtual |
Put the audio hardware output into standby mode.
Returns status based on include/utils/Errors.h
| virtual ssize_t android_audio_legacy::AudioStreamOut::write |
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const void * |
buffer, |
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size_t |
bytes |
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) |
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pure virtual |
write audio buffer to driver.
Returns number of bytes written