C++ (Cpp) convertIntToFloat Examples

Example #1

File: SampleBuffer.cpp Project: AHudon/SOEN6471_LMMS

f_cnt_t SampleBuffer::decodeSampleSF( const char * _f,
					int_sample_t * & _buf,
					ch_cnt_t & _channels,
					sample_rate_t & _samplerate )
{
	SNDFILE * snd_file;
	SF_INFO sf_info;
	f_cnt_t frames = 0;
	bool sf_rr = false;
	sample_t * fbuf = 0;

	if( ( snd_file = sf_open( _f, SFM_READ, &sf_info ) ) != NULL )
	{
		frames = sf_info.frames;

		// check if float
		if ( (sf_info.format & SF_FORMAT_SUBMASK) == SF_FORMAT_FLOAT ) // if yes, use float format for buffer
		{
			fbuf = new sample_t[sf_info.channels * frames];
			sf_rr = sf_read_float( snd_file, fbuf, sf_info.channels * frames );
		}
		else // otherwise, use int
		{
			_buf = new int_sample_t[sf_info.channels * frames];
			sf_rr = sf_read_short( snd_file, _buf, sf_info.channels * frames );
		}

		if( sf_rr < sf_info.channels * frames )
		{
#ifdef DEBUG_LMMS
			printf( "SampleBuffer::decodeSampleSF(): could not read"
				" sample %s: %s\n", _f, sf_strerror( NULL ) );
#endif
		}
		_channels = sf_info.channels;
		_samplerate = sf_info.samplerate;

		sf_close( snd_file );
	}
	else
	{
#ifdef DEBUG_LMMS
		printf( "SampleBuffer::decodeSampleSF(): could not load "
				"sample %s: %s\n", _f, sf_strerror( NULL ) );
#endif
	}
    //write down either directly or convert i->f depending on file type

    if ( frames > 0 && fbuf != NULL )
    {
        directFloatWrite ( fbuf, frames, _channels);
    }
    else if ( frames > 0 && _buf != NULL )
    {
        convertIntToFloat ( _buf, frames, _channels);
    }

	return frames;
}

Example #2

File: SampleBuffer.cpp Project: floft/lmms

f_cnt_t SampleBuffer::decodeSampleDS( const char * _f,
						int_sample_t * & _buf,
						ch_cnt_t & _channels,
						sample_rate_t & _samplerate )
{
	DrumSynth ds;
	f_cnt_t frames = ds.GetDSFileSamples( _f, _buf, _channels, _samplerate );

	if ( frames > 0 && _buf != NULL )
	{
		convertIntToFloat ( _buf, frames, _channels);
	}

	return frames;

}

Example #3

File: SampleBuffer.cpp Project: floft/lmms

f_cnt_t SampleBuffer::decodeSampleOGGVorbis( const char * _f,
						int_sample_t * & _buf,
						ch_cnt_t & _channels,
						sample_rate_t & _samplerate )
{
	static ov_callbacks callbacks =
	{
		qfileReadCallback,
		qfileSeekCallback,
		qfileCloseCallback,
		qfileTellCallback
	} ;

	OggVorbis_File vf;

	f_cnt_t frames = 0;

	QFile * f = new QFile( _f );
	if( f->open( QFile::ReadOnly ) == false )
	{
		delete f;
		return 0;
	}

	int err = ov_open_callbacks( f, &vf, NULL, 0, callbacks );

	if( err < 0 )
	{
		switch( err )
		{
			case OV_EREAD:
				printf( "SampleBuffer::decodeSampleOGGVorbis():"
						" media read error\n" );
				break;
			case OV_ENOTVORBIS:
/*				printf( "SampleBuffer::decodeSampleOGGVorbis():"
					" not an Ogg Vorbis file\n" );*/
				break;
			case OV_EVERSION:
				printf( "SampleBuffer::decodeSampleOGGVorbis():"
						" vorbis version mismatch\n" );
				break;
			case OV_EBADHEADER:
				printf( "SampleBuffer::decodeSampleOGGVorbis():"
					" invalid Vorbis bitstream header\n" );
				break;
			case OV_EFAULT:
				printf( "SampleBuffer::decodeSampleOgg(): "
					"internal logic fault\n" );
				break;
		}
		delete f;
		return 0;
	}

	ov_pcm_seek( &vf, 0 );

   	_channels = ov_info( &vf, -1 )->channels;
   	_samplerate = ov_info( &vf, -1 )->rate;

	ogg_int64_t total = ov_pcm_total( &vf, -1 );

	_buf = new int_sample_t[total * _channels];
	int bitstream = 0;
	long bytes_read = 0;

	do
	{
		bytes_read = ov_read( &vf, (char *) &_buf[frames * _channels],
					( total - frames ) * _channels *
							BYTES_PER_INT_SAMPLE,
					isLittleEndian() ? 0 : 1,
					BYTES_PER_INT_SAMPLE, 1, &bitstream );
		if( bytes_read < 0 )
		{
			break;
		}
		frames += bytes_read / ( _channels * BYTES_PER_INT_SAMPLE );
	}
	while( bytes_read != 0 && bitstream == 0 );

	ov_clear( &vf );
	// if buffer isn't empty, convert it to float and write it down

	if ( frames > 0 && _buf != NULL )
	{
		convertIntToFloat ( _buf, frames, _channels);
	}

	return frames;
}