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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, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <speex/speex_resampler.h>
#include <math.h>
#include <pulsecore/once.h>
#include <pulsecore/resampler.h>
bool pa_speex_is_fixed_point(void) {
static bool result = false;
PA_ONCE_BEGIN {
float f_out = -1.0f, f_in = 1.0f;
spx_uint32_t in_len = 1, out_len = 1;
SpeexResamplerState *s;
pa_assert_se(s = speex_resampler_init(1, 1, 1,
SPEEX_RESAMPLER_QUALITY_MIN, NULL));
/* feed one sample that is too soft for fixed-point speex */
pa_assert_se(speex_resampler_process_float(s, 0, &f_in, &in_len,
&f_out, &out_len) == RESAMPLER_ERR_SUCCESS);
/* expecting sample has been processed, one sample output */
pa_assert_se(in_len == 1 && out_len == 1);
/* speex compiled with --enable-fixed-point will output 0.0 due to insufficient precision */
if (fabsf(f_out) < 0.00001f)
result = true;
speex_resampler_destroy(s);
} PA_ONCE_END;
return result;
}
static unsigned speex_resample_float(pa_resampler *r, const pa_memchunk *input, unsigned in_n_frames, pa_memchunk *output, unsigned *out_n_frames) {
float *in, *out;
uint32_t inf = in_n_frames, outf = *out_n_frames;
SpeexResamplerState *state;
pa_assert(r);
pa_assert(input);
pa_assert(output);
pa_assert(out_n_frames);
state = r->impl.data;
in = pa_memblock_acquire_chunk(input);
out = pa_memblock_acquire_chunk(output);
/* Strictly speaking, speex resampler expects its input
* to be normalized to the [-32768.0 .. 32767.0] range.
* This matters if speex has been compiled with --enable-fixed-point,
* because such speex will round the samples to the nearest
* integer. speex with --enable-fixed-point is therefore incompatible
* with PulseAudio's floating-point sample range [-1 .. 1]. speex
* without --enable-fixed-point works fine with this range.
* Care has been taken to call speex_resample_float() only
* for speex compiled without --enable-fixed-point.
*/
pa_assert_se(speex_resampler_process_interleaved_float(state, in, &inf, out, &outf) == 0);
pa_memblock_release(input->memblock);
pa_memblock_release(output->memblock);
pa_assert(inf == in_n_frames);
*out_n_frames = outf;
return 0;
}
static unsigned speex_resample_int(pa_resampler *r, const pa_memchunk *input, unsigned in_n_frames, pa_memchunk *output, unsigned *out_n_frames) {
int16_t *in, *out;
uint32_t inf = in_n_frames, outf = *out_n_frames;
SpeexResamplerState *state;
pa_assert(r);
pa_assert(input);
pa_assert(output);
pa_assert(out_n_frames);
state = r->impl.data;
in = pa_memblock_acquire_chunk(input);
out = pa_memblock_acquire_chunk(output);
pa_assert_se(speex_resampler_process_interleaved_int(state, in, &inf, out, &outf) == 0);
pa_memblock_release(input->memblock);
pa_memblock_release(output->memblock);
pa_assert(inf == in_n_frames);
*out_n_frames = outf;
return 0;
}
static void speex_update_rates(pa_resampler *r) {
SpeexResamplerState *state;
pa_assert(r);
state = r->impl.data;
pa_assert_se(speex_resampler_set_rate(state, r->i_ss.rate, r->o_ss.rate) == 0);
}
static void speex_reset(pa_resampler *r) {
SpeexResamplerState *state;
pa_assert(r);
state = r->impl.data;
pa_assert_se(speex_resampler_reset_mem(state) == 0);
}
static void speex_free(pa_resampler *r) {
SpeexResamplerState *state;
pa_assert(r);
state = r->impl.data;
if (!state)
return;
speex_resampler_destroy(state);
}
int pa_resampler_speex_init(pa_resampler *r) {
int q, err;
SpeexResamplerState *state;
pa_assert(r);
r->impl.free = speex_free;
r->impl.update_rates = speex_update_rates;
r->impl.reset = speex_reset;
if (r->method >= PA_RESAMPLER_SPEEX_FIXED_BASE && r->method <= PA_RESAMPLER_SPEEX_FIXED_MAX) {
q = r->method - PA_RESAMPLER_SPEEX_FIXED_BASE;
r->impl.resample = speex_resample_int;
} else {
pa_assert(r->method >= PA_RESAMPLER_SPEEX_FLOAT_BASE && r->method <= PA_RESAMPLER_SPEEX_FLOAT_MAX);
q = r->method - PA_RESAMPLER_SPEEX_FLOAT_BASE;
r->impl.resample = speex_resample_float;
}
pa_log_info("Choosing speex quality setting %i.", q);
if (!(state = speex_resampler_init(r->work_channels, r->i_ss.rate, r->o_ss.rate, q, &err)))
return -1;
r->impl.data = state;
return 0;
}
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