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56 lines
2.7 KiB
C
56 lines
2.7 KiB
C
/* Spa
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* Copyright (C) 2017 Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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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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typedef SpaResult (*RenderFunc) (SpaAudioTestSrc *this, void *samples, size_t n_samples);
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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 (SpaAudioTestSrc *this, type * samples, size_t n_samples) \
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{ \
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int i, c, channels; \
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double step, amp; \
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\
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channels = this->current_format.info.raw.channels; \
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step = M_PI_M2 * this->props.freq / this->current_format.info.raw.rate; \
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amp = this->props.volume * scale; \
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\
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for (i = 0; i < n_samples; i++) { \
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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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for (c = 0; c < channels; ++c) \
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*samples++ = (type) (sin (this->accumulator) * amp); \
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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 RenderFunc sine_funcs[] = {
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(RenderFunc) audio_test_src_create_sine_int16_t,
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(RenderFunc) audio_test_src_create_sine_int32_t,
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(RenderFunc) audio_test_src_create_sine_float,
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(RenderFunc) audio_test_src_create_sine_double
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};
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