JackLibSampleRateResampler.cpp
/*
Copyright (C) 2008 Grame
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "JackLibSampleRateResampler.h"
#include "JackError.h"
namespace Jack
{
JackLibSampleRateResampler::JackLibSampleRateResampler()
:JackResampler()
{
int error;
fResampler = src_new(SRC_LINEAR, 1, &error);
if (error != 0) {
jack_error("JackLibSampleRateResampler::JackLibSampleRateResampler err = %s", src_strerror(error));
}
}
JackLibSampleRateResampler::JackLibSampleRateResampler(unsigned int quality)
:JackResampler()
{
switch (quality) {
case 0:
quality = SRC_LINEAR;
break;
case 1:
quality = SRC_ZERO_ORDER_HOLD;
break;
case 2:
quality = SRC_SINC_FASTEST;
break;
case 3:
quality = SRC_SINC_MEDIUM_QUALITY;
break;
case 4:
quality = SRC_SINC_BEST_QUALITY;
break;
default:
quality = SRC_LINEAR;
jack_error("Out of range resample quality");
break;
}
int error;
fResampler = src_new(quality, 1, &error);
if (error != 0) {
jack_error("JackLibSampleRateResampler::JackLibSampleRateResampler err = %s", src_strerror(error));
}
}
JackLibSampleRateResampler::~JackLibSampleRateResampler()
{
src_delete(fResampler);
}
void JackLibSampleRateResampler::Reset(unsigned int new_size)
{
JackResampler::Reset(new_size);
src_reset(fResampler);
}
unsigned int JackLibSampleRateResampler::ReadResample(jack_default_audio_sample_t* buffer, unsigned int frames)
{
jack_ringbuffer_data_t ring_buffer_data[2];
SRC_DATA src_data;
unsigned int frames_to_write = frames;
unsigned int written_frames = 0;
int res;
jack_ringbuffer_get_read_vector(fRingBuffer, ring_buffer_data);
unsigned int available_frames = (ring_buffer_data[0].len + ring_buffer_data[1].len) / sizeof(jack_default_audio_sample_t);
jack_log("Output available = %ld", available_frames);
for (int j = 0; j < 2; j++) {
if (ring_buffer_data[j].len > 0) {
src_data.data_in = (jack_default_audio_sample_t*)ring_buffer_data[j].buf;
src_data.data_out = &buffer[written_frames];
src_data.input_frames = ring_buffer_data[j].len / sizeof(jack_default_audio_sample_t);
src_data.output_frames = frames_to_write;
src_data.end_of_input = 0;
src_data.src_ratio = fRatio;
res = src_process(fResampler, &src_data);
if (res != 0) {
jack_error("JackLibSampleRateResampler::ReadResample ratio = %f err = %s", fRatio, src_strerror(res));
return 0;
}
frames_to_write -= src_data.output_frames_gen;
written_frames += src_data.output_frames_gen;
if ((src_data.input_frames_used == 0 || src_data.output_frames_gen == 0) && j == 0) {
jack_log("Output : j = %d input_frames_used = %ld output_frames_gen = %ld frames1 = %lu frames2 = %lu"
, j, src_data.input_frames_used, src_data.output_frames_gen, ring_buffer_data[0].len, ring_buffer_data[1].len);
}
jack_log("Output : j = %d input_frames_used = %ld output_frames_gen = %ld", j, src_data.input_frames_used, src_data.output_frames_gen);
jack_ringbuffer_read_advance(fRingBuffer, src_data.input_frames_used * sizeof(jack_default_audio_sample_t));
}
}
if (written_frames < frames) {
jack_error("Output available = %ld", available_frames);
jack_error("JackLibSampleRateResampler::ReadResample error written_frames = %ld", written_frames);
}
return written_frames;
}
unsigned int JackLibSampleRateResampler::WriteResample(jack_default_audio_sample_t* buffer, unsigned int frames)
{
jack_ringbuffer_data_t ring_buffer_data[2];
SRC_DATA src_data;
unsigned int frames_to_read = frames;
unsigned int read_frames = 0;
int res;
jack_ringbuffer_get_write_vector(fRingBuffer, ring_buffer_data);
unsigned int available_frames = (ring_buffer_data[0].len + ring_buffer_data[1].len) / sizeof(jack_default_audio_sample_t);
jack_log("Input available = %ld", available_frames);
for (int j = 0; j < 2; j++) {
if (ring_buffer_data[j].len > 0) {
src_data.data_in = &buffer[read_frames];
src_data.data_out = (jack_default_audio_sample_t*)ring_buffer_data[j].buf;
src_data.input_frames = frames_to_read;
src_data.output_frames = (ring_buffer_data[j].len / sizeof(jack_default_audio_sample_t));
src_data.end_of_input = 0;
src_data.src_ratio = fRatio;
res = src_process(fResampler, &src_data);
if (res != 0) {
jack_error("JackLibSampleRateResampler::WriteResample ratio = %f err = %s", fRatio, src_strerror(res));
return 0;
}
frames_to_read -= src_data.input_frames_used;
read_frames += src_data.input_frames_used;
if ((src_data.input_frames_used == 0 || src_data.output_frames_gen == 0) && j == 0) {
jack_log("Input : j = %d input_frames_used = %ld output_frames_gen = %ld frames1 = %lu frames2 = %lu"
, j, src_data.input_frames_used, src_data.output_frames_gen, ring_buffer_data[0].len, ring_buffer_data[1].len);
}
jack_log("Input : j = %d input_frames_used = %ld output_frames_gen = %ld", j, src_data.input_frames_used, src_data.output_frames_gen);
jack_ringbuffer_write_advance(fRingBuffer, src_data.output_frames_gen * sizeof(jack_default_audio_sample_t));
}
}
if (read_frames < frames) {
jack_error("Input available = %ld", available_frames);
jack_error("JackLibSampleRateResampler::WriteResample error read_frames = %ld", read_frames);
}
return read_frames;
}
}
Jack
Definition: JackAC3Encoder.cpp:30
jack_ringbuffer_write_advance
void jack_ringbuffer_write_advance(jack_ringbuffer_t *rb, size_t cnt)
jack_error
SERVER_EXPORT void jack_error(const char *fmt,...)
Definition: JackError.cpp:92
jack_ringbuffer_get_read_vector
void jack_ringbuffer_get_read_vector(const jack_ringbuffer_t *rb, jack_ringbuffer_data_t *vec)
jack_ringbuffer_get_write_vector
void jack_ringbuffer_get_write_vector(const jack_ringbuffer_t *rb, jack_ringbuffer_data_t *vec)
jack_ringbuffer_read_advance
void jack_ringbuffer_read_advance(jack_ringbuffer_t *rb, size_t cnt)
jack_ringbuffer_data_t
Definition: ringbuffer.h:45
jack_log
SERVER_EXPORT void jack_log(const char *fmt,...)
Definition: JackError.cpp:108
SRC_DATA
Definition: samplerate.h:42