mpd/src/pcm_channels.c
Avuton Olrich 0aee49bdf8 all: Update copyright header.
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.
2009-03-13 11:51:55 -07:00

246 lines
5.9 KiB
C

/*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "pcm_channels.h"
#include "pcm_buffer.h"
#include <glib.h>
#include <assert.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "pcm"
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,
int8_t dest_channels,
int8_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 {
g_warning("conversion %u->%u channels is not supported",
src_channels, dest_channels);
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,
int8_t dest_channels,
int8_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 {
g_warning("conversion %u->%u channels is not supported",
src_channels, dest_channels);
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,
int8_t dest_channels,
int8_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 {
g_warning("conversion %u->%u channels is not supported",
src_channels, dest_channels);
return NULL;
}
return dest;
}