ref: a5c1cc0792714826785832d1a75cff260b73670e
dir: /src/effects_i.c/
/* Implements a libSoX internal interface for implementing effects.
* All public functions & data are prefixed with lsx_ .
*
* Copyright (c) 2005-8 Chris Bagwell and SoX contributors
*
* This library 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.
*
* This library 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 Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define LSX_EFF_ALIAS
#include "sox_i.h"
#include <string.h>
int lsx_usage(sox_effect_t * effp)
{
if (effp->handler.usage)
lsx_fail("usage: %s", effp->handler.usage);
else
lsx_fail("this effect takes no parameters");
return SOX_EOF;
}
char * lsx_usage_lines(char * * usage, char const * const * lines, size_t n)
{
if (!*usage) {
size_t i, len;
for (len = i = 0; i < n; len += strlen(lines[i++]) + 1);
*usage = lsx_malloc(len);
strcpy(*usage, lines[0]);
for (i = 1; i < n; ++i) {
strcat(*usage, "\n");
strcat(*usage, lines[i]);
}
}
return *usage;
}
lsx_enum_item const lsx_wave_enum[] = {
LSX_ENUM_ITEM(SOX_WAVE_,SINE)
LSX_ENUM_ITEM(SOX_WAVE_,TRIANGLE)
{0, 0}};
void lsx_generate_wave_table(
lsx_wave_t wave_type,
sox_data_t data_type,
void *table,
size_t table_size,
double min,
double max,
double phase)
{
uint32_t t;
uint32_t phase_offset = phase / M_PI / 2 * table_size + 0.5;
for (t = 0; t < table_size; t++)
{
uint32_t point = (t + phase_offset) % table_size;
double d;
switch (wave_type)
{
case SOX_WAVE_SINE:
d = (sin((double)point / table_size * 2 * M_PI) + 1) / 2;
break;
case SOX_WAVE_TRIANGLE:
d = (double)point * 2 / table_size;
switch (4 * point / table_size)
{
case 0: d = d + 0.5; break;
case 1: case 2: d = 1.5 - d; break;
case 3: d = d - 1.5; break;
}
break;
default: /* Oops! FIXME */
d = 0.0; /* Make sure we have a value */
break;
}
d = d * (max - min) + min;
switch (data_type)
{
case SOX_FLOAT:
{
float *fp = (float *)table;
*fp++ = (float)d;
table = fp;
continue;
}
case SOX_DOUBLE:
{
double *dp = (double *)table;
*dp++ = d;
table = dp;
continue;
}
default: break;
}
d += d < 0? -0.5 : +0.5;
switch (data_type)
{
case SOX_SHORT:
{
short *sp = table;
*sp++ = (short)d;
table = sp;
continue;
}
case SOX_INT:
{
int *ip = table;
*ip++ = (int)d;
table = ip;
continue;
}
default: break;
}
}
}
/*
* lsx_parsesamples
*
* Parse a string for # of samples. If string ends with a 's'
* then the string is interpreted as a user calculated # of samples.
* If string contains ':' or '.' or if it ends with a 't' then its
* treated as an amount of time. This is converted into seconds and
* fraction of seconds and then use the sample rate to calculate
* # of samples.
* Returns NULL on error, pointer to next char to parse otherwise.
*/
char const * lsx_parsesamples(sox_rate_t rate, const char *str0, size_t *samples, int def)
{
int i, found_samples = 0, found_time = 0;
char const * end;
char const * pos;
sox_bool found_colon, found_dot;
char * str = (char *)str0;
for (;*str == ' '; ++str);
for (end = str; *end && strchr("0123456789:.ets", *end); ++end);
if (end == str)
return NULL;
pos = strchr(str, ':');
found_colon = pos && pos < end;
pos = strchr(str, '.');
found_dot = pos && pos < end;
if (found_colon || found_dot || *(end-1) == 't')
found_time = 1;
else if (*(end-1) == 's')
found_samples = 1;
if (found_time || (def == 't' && !found_samples)) {
for (*samples = 0, i = 0; *str != '.' && i < 3; ++i) {
char * last_str = str;
long part = strtol(str, &str, 10);
if (!i && str == last_str)
return NULL;
*samples += rate * part;
if (i < 2) {
if (*str != ':')
break;
++str;
*samples *= 60;
}
}
if (*str == '.') {
char * last_str = str;
double part = strtod(str, &str);
if (str == last_str)
return NULL;
*samples += rate * part + .5;
}
return *str == 't'? str + 1 : str;
}
{
char * last_str = str;
double part = strtod(str, &str);
if (str == last_str)
return NULL;
*samples = part + .5;
return *str == 's'? str + 1 : str;
}
}
#if 0
#include <assert.h>
#define TEST(st, samp, len) \
str = st; \
next = lsx_parsesamples(10000, str, &samples, 't'); \
assert(samples == samp && next == str + len);
int main(int argc, char * * argv)
{
char const * str, * next;
size_t samples;
TEST("0" , 0, 1)
TEST("1" , 10000, 1)
TEST("0s" , 0, 2)
TEST("0s,", 0, 2)
TEST("0s/", 0, 2)
TEST("0s@", 0, 2)
TEST("0t" , 0, 2)
TEST("0t,", 0, 2)
TEST("0t/", 0, 2)
TEST("0t@", 0, 2)
TEST("1s" , 1, 2)
TEST("1s,", 1, 2)
TEST("1s/", 1, 2)
TEST("1s@", 1, 2)
TEST(" 01s" , 1, 4)
TEST("1e6s" , 1000000, 4)
TEST("1t" , 10000, 2)
TEST("1t,", 10000, 2)
TEST("1t/", 10000, 2)
TEST("1t@", 10000, 2)
TEST("1.1t" , 11000, 4)
TEST("1.1t,", 11000, 4)
TEST("1.1t/", 11000, 4)
TEST("1.1t@", 11000, 4)
TEST("1e6t" , 10000, 1)
TEST(".0", 0, 2)
TEST("0.0", 0, 3)
TEST("0:0.0", 0, 5)
TEST("0:0:0.0", 0, 7)
TEST(".1", 1000, 2)
TEST(".10", 1000, 3)
TEST("0.1", 1000, 3)
TEST("1.1", 11000, 3)
TEST("1:1.1", 611000, 5)
TEST("1:1:1.1", 36611000, 7)
TEST("1:1", 610000, 3)
TEST("1:01", 610000, 4)
TEST("1:1:1", 36610000, 5)
TEST("1:", 600000, 2)
TEST("1::", 36000000, 3)
TEST("0.444444", 4444, 8)
TEST("0.555555", 5556, 8)
assert(!lsx_parsesamples(10000, "x", &samples, 't'));
return 0;
}
#endif
/* a note is given as an int,
* 0 => 440 Hz = A
* >0 => number of half notes 'up',
* <0 => number of half notes down,
* example 12 => A of next octave, 880Hz
*
* calculated by freq = 440Hz * 2**(note/12)
*/
static double calc_note_freq(double note)
{
return 440.0 * pow(2.0, note / 12.0);
}
/* Read string 'text' and convert to frequency.
* 'text' can be a positive number which is the frequency in Hz.
* If 'text' starts with a hash '%' and a following number the corresponding
* note is calculated.
* Return -1 on error.
*/
double lsx_parse_frequency(char const * text, char * * end_ptr)
{
double result;
if (*text == '%') {
result = strtod(text + 1, end_ptr);
if (*end_ptr == text + 1)
return -1;
return calc_note_freq(result);
}
result = strtod(text, end_ptr);
if (end_ptr) {
if (*end_ptr == text)
return -1;
if (**end_ptr == 'k') {
result *= 1000;
++*end_ptr;
}
}
return result < 0 ? -1 : result;
}
FILE * lsx_open_input_file(sox_effect_t * effp, char const * filename)
{
FILE * file;
if (!filename || !strcmp(filename, "-")) {
if (effp->global_info->global_info->stdin_in_use_by) {
lsx_fail("stdin already in use by `%s'", effp->global_info->global_info->stdin_in_use_by);
return NULL;
}
effp->global_info->global_info->stdin_in_use_by = effp->handler.name;
file = stdin;
}
else if (!(file = fopen(filename, "r"))) {
lsx_fail("couldn't open file %s: %s", filename, strerror(errno));
return NULL;
}
return file;
}
int lsx_effects_init(void)
{
init_fft_cache();
return SOX_SUCCESS;
}
int lsx_effects_quit(void)
{
clear_fft_cache();
return SOX_SUCCESS;
}