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/*
* Copyright (C) 2003-2009 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "pcm_format.h"
#include "pcm_dither.h"
#include <glib.h>
static void
pcm_convert_8_to_16(int16_t *out, const int8_t *in,
unsigned num_samples)
{
while (num_samples > 0) {
*out++ = *in++ << 8;
--num_samples;
}
}
static void
pcm_convert_24_to_16(struct pcm_dither_24 *dither,
int16_t *out, const int32_t *in,
unsigned num_samples)
{
pcm_dither_24_to_16(dither, out, in, num_samples);
}
const int16_t *
pcm_convert_to_16(struct pcm_dither_24 *dither,
uint8_t bits, const void *src,
size_t src_size, size_t *dest_size_r)
{
static int16_t *buf;
static size_t len;
unsigned num_samples;
switch (bits) {
case 8:
num_samples = src_size;
*dest_size_r = src_size << 1;
if (*dest_size_r > len) {
len = *dest_size_r;
buf = g_realloc(buf, len);
}
pcm_convert_8_to_16((int16_t *)buf,
(const int8_t *)src,
num_samples);
return buf;
case 16:
*dest_size_r = src_size;
return src;
case 24:
num_samples = src_size / 4;
*dest_size_r = num_samples * 2;
if (*dest_size_r > len) {
len = *dest_size_r;
buf = g_realloc(buf, len);
}
pcm_convert_24_to_16(dither,
(int16_t *)buf,
(const int32_t *)src,
num_samples);
return buf;
}
g_warning("only 8 or 16 bits are supported for conversion!\n");
return NULL;
}
static void
pcm_convert_8_to_24(int32_t *out, const int8_t *in,
unsigned num_samples)
{
while (num_samples > 0) {
*out++ = *in++ << 16;
--num_samples;
}
}
static void
pcm_convert_16_to_24(int32_t *out, const int16_t *in,
unsigned num_samples)
{
while (num_samples > 0) {
*out++ = *in++ << 8;
--num_samples;
}
}
const int32_t *
pcm_convert_to_24(uint8_t bits, const void *src,
size_t src_size, size_t *dest_size_r)
{
static int32_t *buf;
static size_t len;
unsigned num_samples;
switch (bits) {
case 8:
num_samples = src_size;
*dest_size_r = src_size * 4;
if (*dest_size_r > len) {
len = *dest_size_r;
buf = g_realloc(buf, len);
}
pcm_convert_8_to_24(buf, (const int8_t *)src,
num_samples);
return buf;
case 16:
num_samples = src_size / 2;
*dest_size_r = num_samples * 4;
if (*dest_size_r > len) {
len = *dest_size_r;
buf = g_realloc(buf, len);
}
pcm_convert_16_to_24(buf, (const int16_t *)src,
num_samples);
return buf;
case 24:
*dest_size_r = src_size;
return src;
}
g_warning("only 8 or 24 bits are supported for conversion!\n");
return NULL;
}
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