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Removed voices plugin

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This commit is contained in:
Abramo Bagnara 2000-03-22 16:20:05 +00:00
parent 43e11d788a
commit bce4a22410
1 changed files with 0 additions and 210 deletions
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210
src/pcm/plugin/voices.c
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@ -1,210 +0,0 @@
/*
* Voices conversion Plug-In
* Copyright (c) 1999 by Jaroslav Kysela <perex@suse.cz>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifdef __KERNEL__
#include "../../include/driver.h"
#include "../../include/pcm.h"
#include "../../include/pcm_plugin.h"
#else
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <endian.h>
#include <byteswap.h>
#include "../pcm_local.h"
#endif
/*
* Basic voices conversion plugin
*/
struct voices_private_data {
int src_voices;
int dst_voices;
int width; /* in bites */
int flg_signed: 1;
};
static void divide_8bit(char *src_ptr, char *dst_ptr, int size)
{
while (size-- > 0) {
*dst_ptr++ = *src_ptr;
*dst_ptr++ = *src_ptr++;
}
}
static void divide_16bit(short *src_ptr, short *dst_ptr, int size)
{
while (size-- > 0) {
*dst_ptr++ = *src_ptr;
*dst_ptr++ = *src_ptr++;
}
}
static void merge_8bit_unsigned(unsigned char *src_ptr,
unsigned char *dst_ptr,
int size)
{
while (size-- > 0) {
*dst_ptr++ = ((int)*src_ptr + (int)*(src_ptr + 1)) / 2;
src_ptr += 2;
}
}
static void merge_8bit_signed(signed char *src_ptr,
signed char *dst_ptr,
int size)
{
while (size-- > 0) {
*dst_ptr++ = ((int)*src_ptr + (int)*(src_ptr + 1)) / 2;
src_ptr += 2;
}
}
static void merge_16bit_unsigned(unsigned short *src_ptr,
unsigned short *dst_ptr,
int size)
{
while (size-- > 0) {
*dst_ptr++ = ((int)*src_ptr + (int)*(src_ptr + 1)) / 2;
src_ptr += 2;
}
}
static void merge_16bit_signed(signed short *src_ptr,
signed short *dst_ptr,
int size)
{
while (size-- > 0) {
*dst_ptr++ = ((int)*src_ptr + (int)*(src_ptr + 1)) / 2;
src_ptr += 2;
}
}
static ssize_t voices_transfer(snd_pcm_plugin_t *plugin,
char *src_ptr, size_t src_size,
char *dst_ptr, size_t dst_size)
{
struct voices_private_data *data;
if (plugin == NULL || src_ptr == NULL || src_size < 0 ||
dst_ptr == NULL || dst_size < 0)
return -EINVAL;
if (src_size == 0)
return 0;
data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
if (data == NULL)
return -EINVAL;
switch (data->width) {
case 8:
if (data->src_voices > data->dst_voices) {
if (data->flg_signed) {
merge_8bit_signed(src_ptr, dst_ptr, src_size / 2);
} else {
merge_8bit_unsigned(src_ptr, dst_ptr, src_size / 2);
}
} else {
divide_8bit(src_ptr, dst_ptr, src_size);
}
break;
case 16:
if (data->src_voices > data->dst_voices) {
if (data->flg_signed) {
merge_16bit_signed((short *)src_ptr, (short *)dst_ptr, src_size / 4);
} else {
merge_16bit_unsigned((short *)src_ptr, (short *)dst_ptr, src_size / 4);
}
} else {
divide_16bit((short *)src_ptr, (short *)dst_ptr, src_size / 2);
}
break;
default:
return -EINVAL;
}
return (src_size * data->dst_voices) / data->src_voices;
}
static ssize_t voices_src_size(snd_pcm_plugin_t *plugin, size_t size)
{
struct voices_private_data *data;
if (plugin == NULL || size <= 0)
return -EINVAL;
data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
return (size * data->src_voices) / data->dst_voices;
}
static ssize_t voices_dst_size(snd_pcm_plugin_t *plugin, size_t size)
{
struct voices_private_data *data;
if (plugin == NULL || size <= 0)
return -EINVAL;
data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
return (size * data->dst_voices) / data->src_voices;
}
int snd_pcm_plugin_build_voices(snd_pcm_format_t *src_format,
snd_pcm_format_t *dst_format,
snd_pcm_plugin_t **r_plugin)
{
struct voices_private_data *data;
snd_pcm_plugin_t *plugin;
if (r_plugin == NULL)
return -EINVAL;
*r_plugin = NULL;
if (src_format->interleave != dst_format->interleave &&
src_format->voices > 1)
return -EINVAL;
if (!dst_format->interleave)
return -EINVAL;
if (src_format->format != dst_format->format)
return -EINVAL;
if (src_format->rate != dst_format->rate)
return -EINVAL;
if (src_format->voices == dst_format->voices)
return -EINVAL;
if (src_format->voices < 1 || src_format->voices > 2 ||
dst_format->voices < 1 || dst_format->voices > 2)
return -EINVAL;
if (src_format->format < SND_PCM_SFMT_S8 || src_format->format > SND_PCM_SFMT_U16_BE) {
if (src_format->format != SND_PCM_SFMT_MU_LAW && src_format->format != SND_PCM_SFMT_A_LAW)
return -EINVAL;
}
plugin = snd_pcm_plugin_build("voices conversion",
sizeof(struct voices_private_data));
if (plugin == NULL)
return -ENOMEM;
data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
data->src_voices = src_format->voices;
data->dst_voices = dst_format->voices;
data->width = snd_pcm_format_width(src_format->format);
data->flg_signed = snd_pcm_format_signed(src_format->format);
plugin->transfer = voices_transfer;
plugin->src_size = voices_src_size;
plugin->dst_size = voices_dst_size;
*r_plugin = plugin;
return 0;
}