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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_channels.h"
#include "pcm_buffer.h"
#include <assert.h>
static void
pcm_convert_channels_16_1_to_2(int16_t *dest, const int16_t *src,
unsigned num_frames)
{
while (num_frames-- > 0) {
int16_t value = *src++;
*dest++ = value;
*dest++ = value;
}
}
static void
pcm_convert_channels_16_2_to_1(int16_t *dest, const int16_t *src,
unsigned num_frames)
{
while (num_frames-- > 0) {
int32_t a = *src++, b = *src++;
*dest++ = (a + b) / 2;
}
}
static void
pcm_convert_channels_16_n_to_2(int16_t *dest,
unsigned src_channels, const int16_t *src,
unsigned num_frames)
{
unsigned c;
assert(src_channels > 0);
while (num_frames-- > 0) {
int32_t sum = 0;
int16_t value;
for (c = 0; c < src_channels; ++c)
sum += *src++;
value = sum / (int)src_channels;
/* XXX this is actually only mono ... */
*dest++ = value;
*dest++ = value;
}
}
const int16_t *
pcm_convert_channels_16(struct pcm_buffer *buffer,
uint8_t dest_channels,
uint8_t src_channels, const int16_t *src,
size_t src_size, size_t *dest_size_r)
{
unsigned num_frames = src_size / src_channels / sizeof(*src);
unsigned dest_size = num_frames * dest_channels * sizeof(*src);
int16_t *dest = pcm_buffer_get(buffer, dest_size);
*dest_size_r = dest_size;
if (src_channels == 1 && dest_channels == 2)
pcm_convert_channels_16_1_to_2(dest, src, num_frames);
else if (src_channels == 2 && dest_channels == 1)
pcm_convert_channels_16_2_to_1(dest, src, num_frames);
else if (dest_channels == 2)
pcm_convert_channels_16_n_to_2(dest, src_channels, src,
num_frames);
else
return NULL;
return dest;
}
static void
pcm_convert_channels_24_1_to_2(int32_t *dest, const int32_t *src,
unsigned num_frames)
{
while (num_frames-- > 0) {
int32_t value = *src++;
*dest++ = value;
*dest++ = value;
}
}
static void
pcm_convert_channels_24_2_to_1(int32_t *dest, const int32_t *src,
unsigned num_frames)
{
while (num_frames-- > 0) {
int32_t a = *src++, b = *src++;
*dest++ = (a + b) / 2;
}
}
static void
pcm_convert_channels_24_n_to_2(int32_t *dest,
unsigned src_channels, const int32_t *src,
unsigned num_frames)
{
unsigned c;
assert(src_channels > 0);
while (num_frames-- > 0) {
int32_t sum = 0;
int32_t value;
for (c = 0; c < src_channels; ++c)
sum += *src++;
value = sum / (int)src_channels;
/* XXX this is actually only mono ... */
*dest++ = value;
*dest++ = value;
}
}
const int32_t *
pcm_convert_channels_24(struct pcm_buffer *buffer,
uint8_t dest_channels,
uint8_t src_channels, const int32_t *src,
size_t src_size, size_t *dest_size_r)
{
unsigned num_frames = src_size / src_channels / sizeof(*src);
unsigned dest_size = num_frames * dest_channels * sizeof(*src);
int32_t *dest = pcm_buffer_get(buffer, dest_size);
*dest_size_r = dest_size;
if (src_channels == 1 && dest_channels == 2)
pcm_convert_channels_24_1_to_2(dest, src, num_frames);
else if (src_channels == 2 && dest_channels == 1)
pcm_convert_channels_24_2_to_1(dest, src, num_frames);
else if (dest_channels == 2)
pcm_convert_channels_24_n_to_2(dest, src_channels, src,
num_frames);
else
return NULL;
return dest;
}
static void
pcm_convert_channels_32_1_to_2(int32_t *dest, const int32_t *src,
unsigned num_frames)
{
pcm_convert_channels_24_1_to_2(dest, src, num_frames);
}
static void
pcm_convert_channels_32_2_to_1(int32_t *dest, const int32_t *src,
unsigned num_frames)
{
while (num_frames-- > 0) {
int64_t a = *src++, b = *src++;
*dest++ = (a + b) / 2;
}
}
static void
pcm_convert_channels_32_n_to_2(int32_t *dest,
unsigned src_channels, const int32_t *src,
unsigned num_frames)
{
unsigned c;
assert(src_channels > 0);
while (num_frames-- > 0) {
int64_t sum = 0;
int32_t value;
for (c = 0; c < src_channels; ++c)
sum += *src++;
value = sum / (int64_t)src_channels;
/* XXX this is actually only mono ... */
*dest++ = value;
*dest++ = value;
}
}
const int32_t *
pcm_convert_channels_32(struct pcm_buffer *buffer,
uint8_t dest_channels,
uint8_t src_channels, const int32_t *src,
size_t src_size, size_t *dest_size_r)
{
unsigned num_frames = src_size / src_channels / sizeof(*src);
unsigned dest_size = num_frames * dest_channels * sizeof(*src);
int32_t *dest = pcm_buffer_get(buffer, dest_size);
*dest_size_r = dest_size;
if (src_channels == 1 && dest_channels == 2)
pcm_convert_channels_32_1_to_2(dest, src, num_frames);
else if (src_channels == 2 && dest_channels == 1)
pcm_convert_channels_32_2_to_1(dest, src, num_frames);
else if (dest_channels == 2)
pcm_convert_channels_32_n_to_2(dest, src_channels, src,
num_frames);
else
return NULL;
return dest;
}
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