/*****************************************************************************
* DoWork: process samples buffer
*****************************************************************************
* This function queues the audio buffer to be processed by the galaktos thread
*****************************************************************************/
static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
{
int i_samples;
int i_channels;
float *p_float;
galaktos_thread_t *p_thread = p_filter->p_sys->p_thread;
p_float = (float *)p_in_buf->p_buffer;
i_channels = p_thread->i_channels;
p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
p_out_buf->i_nb_bytes = p_in_buf->i_nb_bytes;
for( i_samples = p_in_buf->i_nb_samples; i_samples > 0; i_samples-- )
{
int i_cur_sample = p_thread->i_cur_sample;
p_thread->p_data[0][i_cur_sample] = FloatToInt16( p_float[0] );
if( i_channels > 1 )
{
p_thread->p_data[1][i_cur_sample] = FloatToInt16( p_float[1] );
}
p_float += i_channels;
if( ++(p_thread->i_cur_sample) == 512 )
{
addPCM( p_thread->p_data );
p_thread->i_cur_sample = 0;
}
}
}
/*****************************************************************************
* Fill buffer
*****************************************************************************/
static int FillBuffer( int16_t *p_data, int *pi_data,
date_t *pi_date, date_t *pi_date_end,
goom_thread_t *p_this )
{
int i_samples = 0;
block_t *p_block;
while( *pi_data < 512 )
{
if( !p_this->i_blocks ) return VLC_EGENERIC;
p_block = p_this->pp_blocks[0];
i_samples = __MIN( (unsigned)(512 - *pi_data),
p_block->i_buffer / sizeof(float) / p_this->i_channels );
/* Date management */
if( p_block->i_pts > VLC_TS_INVALID &&
p_block->i_pts != date_Get( pi_date_end ) )
{
date_Set( pi_date_end, p_block->i_pts );
}
p_block->i_pts = VLC_TS_INVALID;
date_Increment( pi_date_end, i_samples );
while( i_samples > 0 )
{
float *p_float = (float *)p_block->p_buffer;
p_data[*pi_data] = FloatToInt16( p_float[0] );
if( p_this->i_channels > 1 )
p_data[512 + *pi_data] = FloatToInt16( p_float[1] );
(*pi_data)++;
p_block->p_buffer += (sizeof(float) * p_this->i_channels);
p_block->i_buffer -= (sizeof(float) * p_this->i_channels);
i_samples--;
}
if( !p_block->i_buffer )
{
block_Release( p_block );
p_this->i_blocks--;
if( p_this->i_blocks )
memmove( p_this->pp_blocks, p_this->pp_blocks + 1,
p_this->i_blocks * sizeof(block_t *) );
}
}
*pi_date = *pi_date_end;
*pi_data = 0;
return VLC_SUCCESS;
}
PackedInt16Cplx* CreatePackedTwiddleFactors(int size)
{
int i;
PackedInt16Cplx* twiddleFactors = (PackedInt16Cplx*)malloc(sizeof(PackedInt16Cplx)*size);
float scaleFac = (float)(1<<15);
if(twiddleFactors) {
for(i = 0; i < size/2; ++i) {
int cosSin;
float tmp;
tmp = scaleFac*cosf(2.0*M_PI*i/size);
cosSin = FloatToInt16(tmp) << 16;
tmp = -scaleFac*sinf(2.0*M_PI*i/size);
cosSin |= FloatToInt16(tmp) & 0x0000ffff;
twiddleFactors[i] = cosSin;
}
}
return twiddleFactors;
}
