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#include "fische_internal.h"
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#ifdef DEBUG
#include <stdio.h>
#endif
struct fische__audiobuffer*
fische__audiobuffer_new (struct fische* parent) {
struct fische__audiobuffer* retval = malloc (sizeof (struct fische__audiobuffer));
retval->priv = malloc (sizeof (struct _fische__audiobuffer_));
struct _fische__audiobuffer_* P = retval->priv;
P->fische = parent;
P->buffer = 0;
P->buffer_size = 0;
P->format = parent->audio_format;
P->is_locked = 0;
P->puts = 0;
P->gets = 0;
P->last_get = 0;
retval->front_sample_count = 0;
retval->front_samples = 0;
retval->back_sample_count = 0;
retval->back_samples = 0;
return retval;
}
void
fische__audiobuffer_free (struct fische__audiobuffer* self)
{
if (!self)
return;
fische__audiobuffer_lock( self );
free (self->priv->buffer);
free (self->priv);
free (self);
}
void
fische__audiobuffer_insert (struct fische__audiobuffer* self, const void* data, uint_fast32_t size)
{
struct _fische__audiobuffer_* P = self->priv;
if (P->buffer_size > 44100)
return;
uint_fast8_t width = 1;
switch (P->format) {
case FISCHE_AUDIOFORMAT_DOUBLE:
width = 8;
break;
case FISCHE_AUDIOFORMAT_FLOAT:
case FISCHE_AUDIOFORMAT_S32:
case FISCHE_AUDIOFORMAT_U32:
width = 4;
break;
case FISCHE_AUDIOFORMAT_S16:
case FISCHE_AUDIOFORMAT_U16:
width = 2;
}
uint_fast32_t old_bufsize = P->buffer_size;
P->buffer_size += size / width;
P->buffer = realloc (P->buffer, P->buffer_size * sizeof (double));
uint_fast32_t i;
for (i = 0; i < size / width; ++ i) {
double* dest = (P->buffer + old_bufsize + i);
switch (P->format) {
case FISCHE_AUDIOFORMAT_FLOAT:
*dest = * ( (float*) data + i);
break;
case FISCHE_AUDIOFORMAT_DOUBLE:
*dest = * ( (double*) data + i);
break;
case FISCHE_AUDIOFORMAT_S32:
*dest = * ( (int32_t*) data + i);
*dest /= INT32_MAX;
break;
case FISCHE_AUDIOFORMAT_U32:
*dest = * ( (uint32_t*) data + i);
*dest -= INT32_MAX;
*dest /= INT32_MAX;
break;
case FISCHE_AUDIOFORMAT_S16:
*dest = * ( (int16_t*) data + i);
*dest /= INT16_MAX;
break;
case FISCHE_AUDIOFORMAT_U16:
*dest = * ( (uint16_t*) data + i);
*dest -= INT16_MAX;
*dest /= INT16_MAX;
break;
case FISCHE_AUDIOFORMAT_S8:
*dest = * ( (int8_t*) data + i);
*dest /= INT8_MAX;
break;
case FISCHE_AUDIOFORMAT_U8:
*dest = * ( (uint8_t*) data + i);
*dest /= INT8_MAX;
*dest /= INT8_MAX;
break;
}
}
++ P->puts;
}
void
fische__audiobuffer_get (struct fische__audiobuffer* self)
{
struct _fische__audiobuffer_* P = self->priv;
if (P->buffer_size == 0)
return;
double* new_start = P->buffer + P->last_get * 2;
P->buffer_size -= P->last_get * 2;
// pop used data off front
memmove (P->buffer, new_start, P->buffer_size * sizeof (double));
P->buffer = realloc (P->buffer, P->buffer_size * sizeof (double));
if (!P->puts)
return;
// fallback for first get
if (P->gets == 0) {
P->gets = 3;
P->puts = 1;
}
// get/put ratio
double d_ratio = ( (double) P->gets ) / P->puts;
uint_fast8_t ratio = ceil( d_ratio );
// how many samples to return
uint_fast32_t n_samples = P->buffer_size / 2 / ratio;
// set return data size and remember
self->front_sample_count = n_samples;
self->back_sample_count = n_samples;
P->last_get = n_samples;
// set export buffer
self->front_samples = P->buffer;
self->back_samples = P->buffer + P->buffer_size - n_samples * 2;
// increment get counter
++ P->gets;
}
void
fische__audiobuffer_lock (struct fische__audiobuffer* self)
{
#ifdef __GNUC__
while ( !__sync_bool_compare_and_swap( &self->priv->is_locked, 0, 1 ) )
usleep( 1 );
#else
while( self->priv->is_locked )
usleep( 1 );
self->priv->is_locked = 1;
#endif
}
void
fische__audiobuffer_unlock (struct fische__audiobuffer* self)
{
self->priv->is_locked = 0;
}
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