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/*
* 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 "config.h"
#include "pcm_byteswap.h"
#include "pcm_buffer.h"
#include <glib.h>
#include <assert.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "pcm"
static inline uint16_t swab16(uint16_t x)
{
return (x << 8) | (x >> 8);
}
const int16_t *pcm_byteswap_16(struct pcm_buffer *buffer,
const int16_t *src, size_t len)
{
unsigned i;
int16_t *buf = pcm_buffer_get(buffer, len);
assert(buf != NULL);
for (i = 0; i < len / 2; i++)
buf[i] = swab16(src[i]);
return buf;
}
static inline uint32_t swab32(uint32_t x)
{
return (x << 24) |
((x & 0xff00) << 8) |
((x & 0xff0000) >> 8) |
(x >> 24);
}
const int32_t *pcm_byteswap_32(struct pcm_buffer *buffer,
const int32_t *src, size_t len)
{
unsigned i;
int32_t *buf = pcm_buffer_get(buffer, len);
assert(buf != NULL);
for (i = 0; i < len / 4; i++)
buf[i] = swab32(src[i]);
return buf;
}
const void *
pcm_byteswap(struct pcm_buffer *buffer, enum sample_format format,
const void *src, size_t size)
{
switch (format) {
case SAMPLE_FORMAT_UNDEFINED:
case SAMPLE_FORMAT_S24:
/* not implemented */
return NULL;
case SAMPLE_FORMAT_S8:
return src;
case SAMPLE_FORMAT_S16:
return pcm_byteswap_16(buffer, src, size);
case SAMPLE_FORMAT_S24_P32:
case SAMPLE_FORMAT_S32:
return pcm_byteswap_32(buffer, src, size);
}
/* unreachable */
assert(false);
return NULL;
}
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