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/***
This file is part of PulseAudio.
Copyright 2014, 2015 Andrey Semashev
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio 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 Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stddef.h>
#include <soxr.h>
#include <pulsecore/resampler.h>
static unsigned resampler_soxr_resample(pa_resampler *r, const pa_memchunk *input, unsigned in_n_frames,
pa_memchunk *output, unsigned *out_n_frames) {
soxr_t state;
void *in, *out;
size_t consumed = 0, produced = 0;
pa_assert(r);
pa_assert(input);
pa_assert(output);
pa_assert(out_n_frames);
state = r->impl.data;
pa_assert(state);
in = pa_memblock_acquire_chunk(input);
out = pa_memblock_acquire_chunk(output);
pa_assert_se(soxr_process(state, in, in_n_frames, &consumed, out, *out_n_frames, &produced) == 0);
pa_memblock_release(input->memblock);
pa_memblock_release(output->memblock);
*out_n_frames = produced;
return in_n_frames - consumed;
}
static void resampler_soxr_free(pa_resampler *r) {
pa_assert(r);
if (!r->impl.data)
return;
soxr_delete(r->impl.data);
r->impl.data = NULL;
}
static void resampler_soxr_reset(pa_resampler *r) {
#if SOXR_THIS_VERSION >= SOXR_VERSION(0, 1, 2)
pa_assert(r);
soxr_clear(r->impl.data);
#else
/* With libsoxr prior to 0.1.2 soxr_clear() makes soxr_process() crash afterwards,
* so don't use this function and re-create the context instead. */
soxr_t old_state;
pa_assert(r);
old_state = r->impl.data;
r->impl.data = NULL;
if (pa_resampler_soxr_init(r) == 0) {
if (old_state)
soxr_delete(old_state);
} else {
r->impl.data = old_state;
pa_log_error("Failed to reset libsoxr context");
}
#endif
}
static void resampler_soxr_update_rates(pa_resampler *r) {
soxr_t old_state;
pa_assert(r);
/* There is no update method in libsoxr,
* so just re-create the resampler context */
old_state = r->impl.data;
r->impl.data = NULL;
if (pa_resampler_soxr_init(r) == 0) {
if (old_state)
soxr_delete(old_state);
} else {
r->impl.data = old_state;
pa_log_error("Failed to update libsoxr sample rates");
}
}
int pa_resampler_soxr_init(pa_resampler *r) {
soxr_t state;
soxr_datatype_t io_format;
soxr_io_spec_t io_spec;
soxr_runtime_spec_t runtime_spec;
unsigned long quality_recipe;
soxr_quality_spec_t quality;
soxr_error_t err = NULL;
pa_assert(r);
switch (r->work_format) {
case PA_SAMPLE_S16NE:
io_format = SOXR_INT16_I;
break;
case PA_SAMPLE_FLOAT32NE:
io_format = SOXR_FLOAT32_I;
break;
default:
pa_assert_not_reached();
}
io_spec = soxr_io_spec(io_format, io_format);
/* Resample in one thread. Multithreading makes
* performance worse with small chunks of audio. */
runtime_spec = soxr_runtime_spec(1);
switch (r->method) {
case PA_RESAMPLER_SOXR_MQ:
quality_recipe = SOXR_MQ | SOXR_LINEAR_PHASE;
break;
case PA_RESAMPLER_SOXR_HQ:
quality_recipe = SOXR_HQ | SOXR_LINEAR_PHASE;
break;
case PA_RESAMPLER_SOXR_VHQ:
quality_recipe = SOXR_VHQ | SOXR_LINEAR_PHASE;
break;
default:
pa_assert_not_reached();
}
quality = soxr_quality_spec(quality_recipe, 0);
state = soxr_create(r->i_ss.rate, r->o_ss.rate, r->work_channels, &err, &io_spec, &quality, &runtime_spec);
if (!state) {
pa_log_error("Failed to create libsoxr resampler context: %s.", (err ? err : "[unknown error]"));
return -1;
}
r->impl.free = resampler_soxr_free;
r->impl.reset = resampler_soxr_reset;
r->impl.update_rates = resampler_soxr_update_rates;
r->impl.resample = resampler_soxr_resample;
r->impl.data = state;
return 0;
}
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