Method startEncoding

src/core/audio/AudioFileOgg.cpp:70–179

bool AudioFileOgg::startEncoding()
{
	vorbis_comment vc;
	const char * comments = "Cool=This song has been made using LMMS";
	int comment_length = strlen( comments );
	char * user_comments = new char[comment_length + 1];
	strcpy( user_comments, comments );

	vc.user_comments = &user_comments;
	vc.comment_lengths = &comment_length;
	vc.comments = 1;
	vc.vendor = NULL;

	m_channels = channels();

	bool useVariableBitRate = getOutputSettings().getBitRateSettings().isVariableBitRate();
	bitrate_t minimalBitrate = nominalBitrate();
	bitrate_t maximumBitrate = nominalBitrate();

	if( useVariableBitRate )
	{
		minimalBitrate = minBitrate();		// min for vbr
		maximumBitrate = maxBitrate();		// max for vbr
	}


	m_rate 		= sampleRate();		// default-samplerate
	if( m_rate > 48000 )
	{
		m_rate = 48000;
		setSampleRate( 48000 );
	}

	m_comments 	= &vc;			// comments for ogg-file

	// Have vorbisenc choose a mode for us
	vorbis_info_init( &m_vi );

	if( vorbis_encode_setup_managed( &m_vi, m_channels, m_rate,
			( maximumBitrate > 0 )? maximumBitrate * 1000 : -1,
						nominalBitrate() * 1000, 
			( minimalBitrate > 0 )? minimalBitrate * 1000 : -1 ) )
	{
		printf( "Mode initialization failed: invalid parameters for "
								"bitrate\n" );
		vorbis_info_clear( &m_vi );
		delete[] user_comments;
		return false;
	}

	if( useVariableBitRate )
	{
		// Turn off management entirely (if it was turned on).
		vorbis_encode_ctl( &m_vi, OV_ECTL_RATEMANAGE_SET, NULL );
	}
	else
	{
		vorbis_encode_ctl( &m_vi, OV_ECTL_RATEMANAGE_AVG, NULL );