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freeswitch/src/switch_resample.c

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/*
* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
* Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
*
* Version: MPL 1.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
*
* The Initial Developer of the Original Code is
* Anthony Minessale II <anthm@freeswitch.org>
* Portions created by the Initial Developer are Copyright (C)
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Anthony Minessale II <anthm@freeswitch.org>
*
*
* switch_resample.c -- Resampler
*
*/
#include <switch.h>
#include <switch_resample.h>
#ifndef WIN32
#include <switch_private.h>
#endif
#include <speex/speex_resampler.h>
#define NORMFACT (float)0x8000
#define MAXSAMPLE (float)0x7FFF
#define MAXSAMPLEC (char)0x7F
#define QUALITY 0
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
#ifndef MAX
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif
#define resample_buffer(a, b, c) a > b ? ((a / 1000) / 2) * c : ((b / 1000) / 2) * c
SWITCH_DECLARE(switch_status_t) switch_resample_perform_create(switch_audio_resampler_t **new_resampler,
uint32_t from_rate, uint32_t to_rate,
uint32_t to_size,
int quality, uint32_t channels, const char *file, const char *func, int line)
{
int err = 0;
switch_audio_resampler_t *resampler;
double lto_rate, lfrom_rate;
switch_zmalloc(resampler, sizeof(*resampler));
if (!channels) channels = 1;
resampler->resampler = speex_resampler_init(channels, from_rate, to_rate, quality, &err);
if (!resampler->resampler) {
free(resampler);
return SWITCH_STATUS_GENERR;
}
*new_resampler = resampler;
lto_rate = (double) resampler->to_rate;
lfrom_rate = (double) resampler->from_rate;
resampler->from_rate = from_rate;
resampler->to_rate = to_rate;
resampler->factor = (lto_rate / lfrom_rate);
resampler->rfactor = (lfrom_rate / lto_rate);
resampler->channels = channels;
//resampler->to_size = resample_buffer(to_rate, from_rate, (uint32_t) to_size);
resampler->to_size = switch_resample_calc_buffer_size(resampler->to_rate, resampler->from_rate, to_size) / 2;
resampler->to = malloc(resampler->to_size * sizeof(int16_t) * resampler->channels);
switch_assert(resampler->to);
return SWITCH_STATUS_SUCCESS;
}
SWITCH_DECLARE(uint32_t) switch_resample_process(switch_audio_resampler_t *resampler, int16_t *src, uint32_t srclen)
{
int to_size = switch_resample_calc_buffer_size(resampler->to_rate, resampler->from_rate, srclen) / 2;
if (to_size > resampler->to_size) {
resampler->to_size = to_size;
resampler->to = realloc(resampler->to, resampler->to_size * sizeof(int16_t) * resampler->channels);
switch_assert(resampler->to);
}
resampler->to_len = resampler->to_size;
speex_resampler_process_interleaved_int(resampler->resampler, src, &srclen, resampler->to, &resampler->to_len);
return resampler->to_len;
}
SWITCH_DECLARE(void) switch_resample_destroy(switch_audio_resampler_t **resampler)
{
if (resampler && *resampler) {
if ((*resampler)->resampler) {
speex_resampler_destroy((*resampler)->resampler);
}
free((*resampler)->to);
free(*resampler);
*resampler = NULL;
}
}
SWITCH_DECLARE(switch_size_t) switch_float_to_short(float *f, short *s, switch_size_t len)
{
switch_size_t i;
float ft;
for (i = 0; i < len; i++) {
ft = f[i] * NORMFACT;
if (ft >= 0) {
s[i] = (short) (ft + 0.5);
} else {
s[i] = (short) (ft - 0.5);
}
if ((float) s[i] > MAXSAMPLE)
s[i] = (short) MAXSAMPLE / 2;
if (s[i] < (short) -MAXSAMPLE)
s[i] = (short) -MAXSAMPLE / 2;
}
return len;
}
SWITCH_DECLARE(int) switch_char_to_float(char *c, float *f, int len)
{
int i;
if (len % 2) {
return (-1);
}
for (i = 1; i < len; i += 2) {
f[(int) (i / 2)] = (float) (((c[i]) * 0x100) + c[i - 1]);
f[(int) (i / 2)] /= NORMFACT;
if (f[(int) (i / 2)] > MAXSAMPLE)
f[(int) (i / 2)] = MAXSAMPLE;
if (f[(int) (i / 2)] < -MAXSAMPLE)
f[(int) (i / 2)] = -MAXSAMPLE;
}
return len / 2;
}
SWITCH_DECLARE(int) switch_float_to_char(float *f, char *c, int len)
{
int i;
float ft;
long l;
for (i = 0; i < len; i++) {
ft = f[i] * NORMFACT;
if (ft >= 0) {
l = (long) (ft + 0.5);
} else {
l = (long) (ft - 0.5);
}
c[i * 2] = (unsigned char) ((l) & 0xff);
c[i * 2 + 1] = (unsigned char) (((l) >> 8) & 0xff);
}
return len * 2;
}
SWITCH_DECLARE(int) switch_short_to_float(short *s, float *f, int len)
{
int i;
for (i = 0; i < len; i++) {
f[i] = (float) (s[i]) / NORMFACT;
/* f[i] = (float) s[i]; */
}
return len;
}
SWITCH_DECLARE(void) switch_swap_linear(int16_t *buf, int len)
{
int i;
for (i = 0; i < len; i++) {
buf[i] = ((buf[i] >> 8) & 0x00ff) | ((buf[i] << 8) & 0xff00);
}
}
SWITCH_DECLARE(void) switch_generate_sln_silence(int16_t *data, uint32_t samples, uint32_t channels, uint32_t divisor)
{
int16_t s;
uint32_t x, i, j;
int sum_rnd = 0;
int16_t rnd2 = (int16_t) switch_micro_time_now() + (int16_t) (intptr_t) data;
if (channels == 0) channels = 1;
assert(divisor);
if (divisor == (uint32_t)-1) {
memset(data, 0, samples * 2);
return;
}
for (i = 0; i < samples; i++, sum_rnd = 0) {
for (x = 0; x < 6; x++) {
rnd2 = rnd2 * 31821U + 13849U;
sum_rnd += rnd2;
}
s = (int16_t) ((int16_t) sum_rnd / (int) divisor);
for (j = 0; j < channels; j++) {
*data = s;
data++;
}
}
}
SWITCH_DECLARE(uint32_t) switch_merge_sln(int16_t *data, uint32_t samples, int16_t *other_data, uint32_t other_samples, int channels)
{
int i;
int32_t x, z;
if (channels == 0) channels = 1;
if (samples > other_samples) {
x = other_samples;
} else {
x = samples;
}
for (i = 0; i < x * channels; i++) {
z = data[i] + other_data[i];
switch_normalize_to_16bit(z);
data[i] = (int16_t) z;
}
return x;
}
SWITCH_DECLARE(uint32_t) switch_unmerge_sln(int16_t *data, uint32_t samples, int16_t *other_data, uint32_t other_samples, int channels)
{
int i;
int32_t x;
if (channels == 0) channels = 1;
if (samples > other_samples) {
x = other_samples;
} else {
x = samples;
}
for (i = 0; i < x * channels; i++) {
data[i] -= other_data[i];
}
return x;
}
SWITCH_DECLARE(void) switch_mux_channels(int16_t *data, switch_size_t samples, uint32_t orig_channels, uint32_t channels)
{
switch_size_t i = 0;
uint32_t j = 0;
switch_assert(channels < 11);
if (orig_channels > channels) {
for (i = 0; i < samples; i++) {
int32_t z = 0;
for (j = 0; j < orig_channels; j++) {
z += data[i * orig_channels + j];
switch_normalize_to_16bit(z);
data[i] = (int16_t) z;
}
}
} else if (orig_channels < channels) {
/* interesting problem... take a give buffer and double up every sample in the buffer without using any other buffer.....
This way beats the other i think bacause there is no malloc but I do have to copy the data twice */
#if 1
uint32_t k = 0, len = samples * orig_channels;
for (i = 0; i < len; i++) {
data[i+len] = data[i];
}
for (i = 0; i < samples; i++) {
for (j = 0; j < channels; j++) {
data[k++] = data[i + samples];
}
}
#else
uint32_t k = 0, len = samples * 2 * orig_channels;
int16_t *orig = NULL;
switch_zmalloc(orig, len);
memcpy(orig, data, len);
for (i = 0; i < samples; i++) {
for (j = 0; j < channels; j++) {
data[k++] = orig[i];
}
}
free(orig);
#endif
}
}
SWITCH_DECLARE(void) switch_change_sln_volume_granular(int16_t *data, uint32_t samples, int32_t vol)
{
double newrate = 0;
double pos[13] = {1.25, 1.50, 1.75, 2.0, 2.25, 2.50, 2.75, 3.0, 3.25, 3.50, 3.75, 4.0, 4.5};
double neg[13] = {.917, .834, .751, .668, .585, .502, .419, .336, .253, .087, .017, .004, 0.0};
double *chart;
uint32_t i;
if (vol == 0) return;
switch_normalize_volume_granular(vol);
if (vol > 0) {
chart = pos;
} else {
chart = neg;
}
i = abs(vol) - 1;
switch_assert(i < 13);
newrate = chart[i];
if (newrate) {
int32_t tmp;
uint32_t x;
int16_t *fp = data;
for (x = 0; x < samples; x++) {
tmp = (int32_t) (fp[x] * newrate);
switch_normalize_to_16bit(tmp);
fp[x] = (int16_t) tmp;
}
} else {
memset(data, 0, samples * 2);
}
}
SWITCH_DECLARE(void) switch_change_sln_volume(int16_t *data, uint32_t samples, int32_t vol)
{
double newrate = 0;
double pos[4] = {1.3, 2.3, 3.3, 4.3};
double neg[4] = {.80, .60, .40, .20};
double *chart;
uint32_t i;
if (vol == 0) return;
switch_normalize_volume(vol);
if (vol > 0) {
chart = pos;
} else {
chart = neg;
}
i = abs(vol) - 1;
switch_assert(i < 4);
newrate = chart[i];
if (newrate) {
int32_t tmp;
uint32_t x;
int16_t *fp = data;
for (x = 0; x < samples; x++) {
tmp = (int32_t) (fp[x] * newrate);
switch_normalize_to_16bit(tmp);
fp[x] = (int16_t) tmp;
}
}
}
/* For Emacs:
* Local Variables:
* mode:c
* indent-tabs-mode:t
* tab-width:4
* c-basic-offset:4
* End:
* For VIM:
* vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
*/
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