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