0aee49bdf8
This updates the copyright header to all be the same, which is pretty much an update of where to mail request for a copy of the GPL and the years of the MPD project. This also puts all committers under 'The Music Player Project' umbrella. These entries should go individually in the AUTHORS file, for consistancy.
123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "pcm_mix.h"
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#include "pcm_volume.h"
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#include "pcm_utils.h"
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#include "audio_format.h"
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#include <glib.h>
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#include <math.h>
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "pcm"
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static void
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pcm_add_8(int8_t *buffer1, const int8_t *buffer2,
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unsigned num_samples, int volume1, int volume2)
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{
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while (num_samples > 0) {
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int32_t sample1 = *buffer1;
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int32_t sample2 = *buffer2++;
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sample1 = ((sample1 * volume1 + sample2 * volume2) +
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pcm_volume_dither() + PCM_VOLUME_1 / 2)
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/ PCM_VOLUME_1;
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*buffer1++ = pcm_range(sample1, 8);
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--num_samples;
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}
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}
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static void
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pcm_add_16(int16_t *buffer1, const int16_t *buffer2,
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unsigned num_samples, int volume1, int volume2)
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{
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while (num_samples > 0) {
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int32_t sample1 = *buffer1;
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int32_t sample2 = *buffer2++;
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sample1 = ((sample1 * volume1 + sample2 * volume2) +
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pcm_volume_dither() + PCM_VOLUME_1 / 2)
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/ PCM_VOLUME_1;
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*buffer1++ = pcm_range(sample1, 16);
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--num_samples;
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}
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}
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static void
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pcm_add_24(int32_t *buffer1, const int32_t *buffer2,
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unsigned num_samples, unsigned volume1, unsigned volume2)
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{
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while (num_samples > 0) {
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int64_t sample1 = *buffer1;
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int64_t sample2 = *buffer2++;
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sample1 = ((sample1 * volume1 + sample2 * volume2) +
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pcm_volume_dither() + PCM_VOLUME_1 / 2)
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/ PCM_VOLUME_1;
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*buffer1++ = pcm_range(sample1, 24);
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--num_samples;
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}
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}
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static void
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pcm_add(void *buffer1, const void *buffer2, size_t size,
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int vol1, int vol2,
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const struct audio_format *format)
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{
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switch (format->bits) {
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case 8:
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pcm_add_8((int8_t *)buffer1, (const int8_t *)buffer2,
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size, vol1, vol2);
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break;
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case 16:
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pcm_add_16((int16_t *)buffer1, (const int16_t *)buffer2,
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size / 2, vol1, vol2);
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break;
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case 24:
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pcm_add_24((int32_t*)buffer1,
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(const int32_t*)buffer2,
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size / 4, vol1, vol2);
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break;
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default:
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g_error("%u bits not supported by pcm_add!\n", format->bits);
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}
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}
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void
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pcm_mix(void *buffer1, const void *buffer2, size_t size,
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const struct audio_format *format, float portion1)
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{
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int vol1;
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float s = sin(M_PI_2 * portion1);
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s *= s;
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vol1 = s * PCM_VOLUME_1 + 0.5;
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vol1 = vol1 > PCM_VOLUME_1 ? PCM_VOLUME_1 : (vol1 < 0 ? 0 : vol1);
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pcm_add(buffer1, buffer2, size, vol1, PCM_VOLUME_1 - vol1, format);
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}
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