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#include <stdint.h>
#include "ardour/interpolation.h"
using namespace ARDOUR;
LibSamplerateInterpolation::LibSamplerateInterpolation() : _speed (1.0L), state (0)
{
}
LibSamplerateInterpolation::~LibSamplerateInterpolation()
{
for (int i = 0; i < state.size(); i++) {
state[i] = src_delete (state[i]);
}
}
void
LibSamplerateInterpolation::set_speed (double new_speed)
{
_speed = new_speed;
for (int i = 0; i < state.size(); i++) {
src_set_ratio (state[i], 1.0/_speed);
}
}
void
LibSamplerateInterpolation::reset_state ()
{
printf("INTERPOLATION: reset_state()\n");
for (int i = 0; i < state.size(); i++) {
if (state[i]) {
src_reset (state[i]);
} else {
state[i] = src_new (SRC_SINC_FASTEST, 1, &error);
}
}
}
void
LibSamplerateInterpolation::add_channel_to (int input_buffer_size, int output_buffer_size)
{
SRC_DATA* newdata = new SRC_DATA;
/* Set up sample rate converter info. */
newdata->end_of_input = 0 ;
newdata->input_frames = input_buffer_size;
newdata->output_frames = output_buffer_size;
newdata->input_frames_used = 0 ;
newdata->output_frames_gen = 0 ;
newdata->src_ratio = 1.0/_speed;
data.push_back (newdata);
state.push_back (0);
reset_state ();
}
void
LibSamplerateInterpolation::remove_channel_from ()
{
delete data.back ();
data.pop_back ();
delete state.back ();
state.pop_back ();
reset_state ();
}
nframes_t
LibSamplerateInterpolation::interpolate (int channel, nframes_t nframes, Sample *input, Sample *output)
{
if (!data.size ()) {
printf ("ERROR: trying to interpolate with no channels\n");
return 0;
}
data[channel]->data_in = input;
data[channel]->data_out = output;
data[channel]->input_frames = nframes * _speed;
data[channel]->output_frames = nframes;
data[channel]->src_ratio = 1.0/_speed;
if ((error = src_process (state[channel], data[channel]))) {
printf ("\nError : %s\n\n", src_strerror (error));
exit (1);
}
//printf("INTERPOLATION: channel %d input_frames_used: %d\n", channel, data[channel]->input_frames_used);
return data[channel]->input_frames_used;
}
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