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44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/* Spa */
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/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
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/* SPDX-License-Identifier: MIT */
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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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size_t i; \
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uint32_t 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->port.current_format.info.raw.channels; \
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step = M_PI_M2 * freq / this->port.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->port.accumulator += step; \
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if (this->port.accumulator >= M_PI_M2) \
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this->port.accumulator -= M_PI_M2; \
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val = (type) (sin (this->port.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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