94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2003-2011 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.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "pcm_pack.h"
|
|
|
|
#include <glib.h>
|
|
|
|
static void
|
|
pack_sample(uint8_t *dest, const int32_t *src0, bool reverse_endian)
|
|
{
|
|
const uint8_t *src = (const uint8_t *)src0;
|
|
|
|
if ((G_BYTE_ORDER == G_BIG_ENDIAN) != reverse_endian)
|
|
++src;
|
|
|
|
*dest++ = *src++;
|
|
*dest++ = *src++;
|
|
*dest++ = *src++;
|
|
}
|
|
|
|
void
|
|
pcm_pack_24(uint8_t *dest, const int32_t *src, const int32_t *src_end,
|
|
bool reverse_endian)
|
|
{
|
|
/* duplicate loop to help the compiler's optimizer (constant
|
|
parameter to the pack_sample() inline function) */
|
|
|
|
if (G_LIKELY(!reverse_endian)) {
|
|
while (src < src_end) {
|
|
pack_sample(dest, src++, false);
|
|
dest += 3;
|
|
}
|
|
} else {
|
|
while (src < src_end) {
|
|
pack_sample(dest, src++, true);
|
|
dest += 3;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
unpack_sample(int32_t *dest0, const uint8_t *src, bool reverse_endian)
|
|
{
|
|
uint8_t *dest = (uint8_t *)dest0;
|
|
|
|
if ((G_BYTE_ORDER == G_BIG_ENDIAN) != reverse_endian)
|
|
/* extend the sign bit to the most fourth byte */
|
|
*dest++ = *src & 0x80 ? 0xff : 0x00;
|
|
|
|
*dest++ = *src++;
|
|
*dest++ = *src++;
|
|
*dest++ = *src;
|
|
|
|
if ((G_BYTE_ORDER == G_LITTLE_ENDIAN) != reverse_endian)
|
|
/* extend the sign bit to the most fourth byte */
|
|
*dest++ = *src & 0x80 ? 0xff : 0x00;
|
|
}
|
|
|
|
void
|
|
pcm_unpack_24(int32_t *dest, const uint8_t *src, const uint8_t *src_end,
|
|
bool reverse_endian)
|
|
{
|
|
/* duplicate loop to help the compiler's optimizer (constant
|
|
parameter to the unpack_sample() inline function) */
|
|
|
|
if (G_LIKELY(!reverse_endian)) {
|
|
while (src < src_end) {
|
|
unpack_sample(dest++, src, false);
|
|
src += 3;
|
|
}
|
|
} else {
|
|
while (src < src_end) {
|
|
unpack_sample(dest++, src, true);
|
|
src += 3;
|
|
}
|
|
}
|
|
}
|