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