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/* Spa
*
* Copyright © 2018 Wim Taymans
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <math.h>
#define M_PI_M2 ( M_PI + M_PI )
#define DEFINE_SINE(type,scale) \
static void \
audio_test_src_create_sine_##type (struct impl *this, type *samples, size_t n_samples) \
{ \
size_t i; \
uint32_t c, channels; \
float step, amp; \
float freq = this->props.freq; \
float volume = this->props.volume; \
\
channels = this->port.current_format.info.raw.channels; \
step = M_PI_M2 * freq / this->port.current_format.info.raw.rate; \
amp = volume * scale; \
\
for (i = 0; i < n_samples; i++) { \
type val; \
this->port.accumulator += step; \
if (this->port.accumulator >= M_PI_M2) \
this->port.accumulator -= M_PI_M2; \
val = (type) (sin (this->port.accumulator) * amp); \
for (c = 0; c < channels; ++c) \
*samples++ = val; \
} \
}
DEFINE_SINE(int16_t, 32767.0);
DEFINE_SINE(int32_t, 2147483647.0);
DEFINE_SINE(float, 1.0);
DEFINE_SINE(double, 1.0);
static const render_func_t sine_funcs[] = {
(render_func_t) audio_test_src_create_sine_int16_t,
(render_func_t) audio_test_src_create_sine_int32_t,
(render_func_t) audio_test_src_create_sine_float,
(render_func_t) audio_test_src_create_sine_double
};
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