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resampler: Split the resampler implementations into separate files

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Rebased by Peter Meerwald.

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: poljar (Damir Jelić) <poljarinho@gmail.com>
This commit is contained in:
poljar (Damir Jelić) 2014-08-04 14:40:12 +02:00 • committed by Tanu Kaskinen
parent 64d17a6b0a
commit 72103e1e33
8 changed files with 748 additions and 604 deletions
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102
src/pulsecore/resampler/libsamplerate.c Normal file
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/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <samplerate.h>
#include "pulsecore/resampler.h"
static unsigned libsamplerate_resample(pa_resampler *r, const pa_memchunk *input, unsigned in_n_frames, pa_memchunk *output, unsigned *out_n_frames) {
SRC_DATA data;
SRC_STATE *state;
pa_assert(r);
pa_assert(input);
pa_assert(output);
pa_assert(out_n_frames);
state = r->impl.data;
memset(&data, 0, sizeof(data));
data.data_in = pa_memblock_acquire_chunk(input);
data.input_frames = (long int) in_n_frames;
data.data_out = pa_memblock_acquire_chunk(output);
data.output_frames = (long int) *out_n_frames;
data.src_ratio = (double) r->o_ss.rate / r->i_ss.rate;
data.end_of_input = 0;
pa_assert_se(src_process(state, &data) == 0);
pa_memblock_release(input->memblock);
pa_memblock_release(output->memblock);
*out_n_frames = (unsigned) data.output_frames_gen;
return in_n_frames - data.input_frames_used;
}
static void libsamplerate_update_rates(pa_resampler *r) {
SRC_STATE *state;
pa_assert(r);
state = r->impl.data;
pa_assert_se(src_set_ratio(state, (double) r->o_ss.rate / r->i_ss.rate) == 0);
}
static void libsamplerate_reset(pa_resampler *r) {
SRC_STATE *state;
pa_assert(r);
state = r->impl.data;
pa_assert_se(src_reset(state) == 0);
}
static void libsamplerate_free(pa_resampler *r) {
SRC_STATE *state;
pa_assert(r);
state = r->impl.data;
if (state)
src_delete(state);
}
int pa_resampler_libsamplerate_init(pa_resampler *r) {
int err;
SRC_STATE *state;
pa_assert(r);
if (!(state = src_new(r->method, r->work_channels, &err)))
return -1;
r->impl.free = libsamplerate_free;
r->impl.update_rates = libsamplerate_update_rates;
r->impl.resample = libsamplerate_resample;
r->impl.reset = libsamplerate_reset;
r->impl.data = state;
return 0;
}