/* Spa
 * Copyright (C) 2017 Wim Taymans <wim.taymans@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include <math.h>

#define M_PI_M2 ( M_PI + M_PI )

typedef SpaResult (*RenderFunc) (SpaAudioTestSrc *this, void *samples, size_t n_samples);

#define DEFINE_SINE(type,scale)                                                 \
static void                                                                     \
audio_test_src_create_sine_##type (SpaAudioTestSrc *this, type * samples, size_t n_samples) \
{                                                                               \
  int i, c, channels;                                                           \
  double step, amp;                                                             \
                                                                                \
  channels = this->current_format.info.raw.channels;                            \
  step = M_PI_M2 * this->props.freq / this->current_format.info.raw.rate;       \
  amp = this->props.volume * scale;                                             \
                                                                                \
  for (i = 0; i < n_samples; i++) {                                             \
    this->accumulator += step;                                                  \
    if (this->accumulator >= M_PI_M2)                                           \
      this->accumulator -= M_PI_M2;                                             \
    for (c = 0; c < channels; ++c)                                              \
      *samples++ = (type) (sin (this->accumulator) * amp);                      \
  }                                                                             \
}

DEFINE_SINE (int16_t, 32767.0);
DEFINE_SINE (int32_t, 2147483647.0);
DEFINE_SINE (float, 1.0);
DEFINE_SINE (double, 1.0);

static const RenderFunc sine_funcs[] = {
  (RenderFunc) audio_test_src_create_sine_int16_t,
  (RenderFunc) audio_test_src_create_sine_int32_t,
  (RenderFunc) audio_test_src_create_sine_float,
  (RenderFunc) audio_test_src_create_sine_double
};