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Diffstat (limited to '')
| -rw-r--r-- | spa/plugins/audiotestsrc/render.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/spa/plugins/audiotestsrc/render.c b/spa/plugins/audiotestsrc/render.c new file mode 100644 index 0000000..4133fd0 --- /dev/null +++ b/spa/plugins/audiotestsrc/render.c @@ -0,0 +1,64 @@ +/* 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 +}; |