TargetFileOggVorbis::TargetFileOggVorbis( const DataTargetRef &dataTarget, size_t sampleRate, size_t numChannels, SampleType sampleType )
: cinder::audio::TargetFile( sampleRate, numChannels, sampleType ), mDataTarget( dataTarget )
{
CI_ASSERT( mDataTarget );
mStream = mDataTarget->getStream();
vorbis_info_init( &mVorbisInfo );
auto status = vorbis_encode_init_vbr( &mVorbisInfo, getNumChannels(), getSampleRate(), mVorbisBaseQuality );
if ( status ) {
throw AudioFormatExc( string( "TargetFileOggVorbis: invalid quality setting." ) );
}
vorbis_comment_init( &mVorbisComment );
vorbis_comment_add_tag( &mVorbisComment, "ENCODER", "libcinder" );
vorbis_analysis_init( &mVorbisDspState, &mVorbisInfo );
vorbis_block_init( &mVorbisDspState, &mVorbisBlock );
// a constant stream serial number is used, this is okay since no streams are multiplexed
ogg_stream_init( &mOggStream, 0 );
ogg_packet header, headerComment, headerCodebook;
vorbis_analysis_headerout( &mVorbisDspState, &mVorbisComment, &header, &headerComment, &headerCodebook );
ogg_stream_packetin( &mOggStream, &header );
ogg_stream_packetin( &mOggStream, &headerComment );
ogg_stream_packetin( &mOggStream, &headerCodebook );
// flush ogg page so audio data starts on a new page
while ( ogg_stream_flush( &mOggStream, &mOggPage ) != 0 ) {
mStream->writeData( mOggPage.header, mOggPage.header_len );
mStream->writeData( mOggPage.body, mOggPage.body_len );
}
}
OutputDeviceNode::OutputDeviceNode( const DeviceRef &device, const Format &format )
: OutputNode( format ), mDevice( device )
{
if( ! mDevice ) {
string errorMsg = "Empty DeviceRef.";
if( ! audio::Device::getDefaultOutput() )
errorMsg += " Also, no default output Device so perhaps there is no available hardware output.";
throw AudioDeviceExc( errorMsg );
}
// listen to the notifications sent by device property changes in order to update the audio graph.
mWillChangeConn = mDevice->getSignalParamsWillChange().connect( bind( &OutputDeviceNode::deviceParamsWillChange, this ) );
mDidChangeConn = mDevice->getSignalParamsDidChange().connect( bind( &OutputDeviceNode::deviceParamsDidChange, this ) );
mInterruptionBeganConn = Context::deviceManager()->getSignalInterruptionBegan().connect( [this] { disable(); } );
mInterruptionEndedConn = Context::deviceManager()->getSignalInterruptionEnded().connect( [this] { enable(); } );
size_t deviceNumChannels = mDevice->getNumOutputChannels();
// If number of channels hasn't been specified, default to 2 (or 1 if that is all that is available).
if( getChannelMode() != ChannelMode::SPECIFIED ) {
setChannelMode( ChannelMode::SPECIFIED );
setNumChannels( std::min( deviceNumChannels, (size_t)2 ) );
}
// Double check the device has enough channels to support what was requested, which may not be the case if the user asked for more than what is available.
if( deviceNumChannels < getNumChannels() )
throw AudioFormatExc( string( "Device can not accommodate " ) + to_string( deviceNumChannels ) + " output channels." );
}
OutputDeviceNode::OutputDeviceNode( const DeviceRef &device, const Format &format )
: OutputNode( format ), mDevice( device )
{
CI_ASSERT( mDevice );
// listen to the notifications sent by device property changes in order to update the audio graph.
mWillChangeConn = mDevice->getSignalParamsWillChange().connect( bind( &OutputDeviceNode::deviceParamsWillChange, this ) );
mDidChangeConn = mDevice->getSignalParamsDidChange().connect( bind( &OutputDeviceNode::deviceParamsDidChange, this ) );
size_t deviceNumChannels = mDevice->getNumOutputChannels();
// If number of channels hasn't been specified, default to 2 (or 1 if that is all that is available).
if( getChannelMode() != ChannelMode::SPECIFIED ) {
setChannelMode( ChannelMode::SPECIFIED );
setNumChannels( std::min( deviceNumChannels, (size_t)2 ) );
}
// Double check the device has enough channels to support what was requested, which may not be the case if the user asked for more than what is available.
if( deviceNumChannels < getNumChannels() )
throw AudioFormatExc( string( "Device can not accommodate " ) + to_string( deviceNumChannels ) + " output channels." );
}
