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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 <pulse/xmalloc.h>
#include <math.h>
#include <pulsecore/resampler.h>
struct peaks_data { /* data specific to the peak finder pseudo resampler */
unsigned o_counter;
unsigned i_counter;
float max_f[PA_CHANNELS_MAX];
int16_t max_i[PA_CHANNELS_MAX];
};
static unsigned peaks_resample(pa_resampler *r, const pa_memchunk *input, unsigned in_n_frames, pa_memchunk *output, unsigned *out_n_frames) {
unsigned c, o_index = 0;
unsigned i, i_end = 0;
void *src, *dst;
struct peaks_data *peaks_data;
pa_assert(r);
pa_assert(input);
pa_assert(output);
pa_assert(out_n_frames);
peaks_data = r->impl.data;
src = pa_memblock_acquire_chunk(input);
dst = pa_memblock_acquire_chunk(output);
i = ((uint64_t) peaks_data->o_counter * r->i_ss.rate) / r->o_ss.rate;
i = i > peaks_data->i_counter ? i - peaks_data->i_counter : 0;
while (i_end < in_n_frames) {
i_end = ((uint64_t) (peaks_data->o_counter + 1) * r->i_ss.rate) / r->o_ss.rate;
i_end = i_end > peaks_data->i_counter ? i_end - peaks_data->i_counter : 0;
pa_assert_fp(o_index * r->w_fz < pa_memblock_get_length(output->memblock));
/* 1ch float is treated separately, because that is the common case */
if (r->work_channels == 1 && r->work_format == PA_SAMPLE_FLOAT32NE) {
float *s = (float*) src + i;
float *d = (float*) dst + o_index;
for (; i < i_end && i < in_n_frames; i++) {
float n = fabsf(*s++);
if (n > peaks_data->max_f[0])
peaks_data->max_f[0] = n;
}
if (i == i_end) {
*d = peaks_data->max_f[0];
peaks_data->max_f[0] = 0;
o_index++, peaks_data->o_counter++;
}
} else if (r->work_format == PA_SAMPLE_S16NE) {
int16_t *s = (int16_t*) src + r->work_channels * i;
int16_t *d = (int16_t*) dst + r->work_channels * o_index;
for (; i < i_end && i < in_n_frames; i++)
for (c = 0; c < r->work_channels; c++) {
int16_t n = abs(*s++);
if (n > peaks_data->max_i[c])
peaks_data->max_i[c] = n;
}
if (i == i_end) {
for (c = 0; c < r->work_channels; c++, d++) {
*d = peaks_data->max_i[c];
peaks_data->max_i[c] = 0;
}
o_index++, peaks_data->o_counter++;
}
} else {
float *s = (float*) src + r->work_channels * i;
float *d = (float*) dst + r->work_channels * o_index;
for (; i < i_end && i < in_n_frames; i++)
for (c = 0; c < r->work_channels; c++) {
float n = fabsf(*s++);
if (n > peaks_data->max_f[c])
peaks_data->max_f[c] = n;
}
if (i == i_end) {
for (c = 0; c < r->work_channels; c++, d++) {
*d = peaks_data->max_f[c];
peaks_data->max_f[c] = 0;
}
o_index++, peaks_data->o_counter++;
}
}
}
pa_memblock_release(input->memblock);
pa_memblock_release(output->memblock);
*out_n_frames = o_index;
peaks_data->i_counter += in_n_frames;
/* Normalize counters */
while (peaks_data->i_counter >= r->i_ss.rate) {
pa_assert(peaks_data->o_counter >= r->o_ss.rate);
peaks_data->i_counter -= r->i_ss.rate;
peaks_data->o_counter -= r->o_ss.rate;
}
return 0;
}
static void peaks_update_rates_or_reset(pa_resampler *r) {
struct peaks_data *peaks_data;
pa_assert(r);
peaks_data = r->impl.data;
peaks_data->i_counter = 0;
peaks_data->o_counter = 0;
}
int pa_resampler_peaks_init(pa_resampler*r) {
struct peaks_data *peaks_data;
pa_assert(r);
pa_assert(r->i_ss.rate >= r->o_ss.rate);
pa_assert(r->work_format == PA_SAMPLE_S16NE || r->work_format == PA_SAMPLE_FLOAT32NE);
peaks_data = pa_xnew0(struct peaks_data, 1);
r->impl.resample = peaks_resample;
r->impl.update_rates = peaks_update_rates_or_reset;
r->impl.reset = peaks_update_rates_or_reset;
r->impl.data = peaks_data;
return 0;
}
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