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https://github.com/alsa-project/alsa-lib.git
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Removed voices plugin
This commit is contained in:
Abramo Bagnara
parent
43e11d788a
commit
bce4a22410
1 changed files with 0 additions and 210 deletions
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/*
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* Voices conversion Plug-In
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* Copyright (c) 1999 by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#ifdef __KERNEL__
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#include "../../include/driver.h"
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#include "../../include/pcm.h"
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#include "../../include/pcm_plugin.h"
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <endian.h>
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#include <byteswap.h>
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#include "../pcm_local.h"
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#endif
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/*
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* Basic voices conversion plugin
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*/
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struct voices_private_data {
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int src_voices;
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int dst_voices;
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int width; /* in bites */
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int flg_signed: 1;
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};
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static void divide_8bit(char *src_ptr, char *dst_ptr, int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = *src_ptr;
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*dst_ptr++ = *src_ptr++;
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}
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}
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static void divide_16bit(short *src_ptr, short *dst_ptr, int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = *src_ptr;
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*dst_ptr++ = *src_ptr++;
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}
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}
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static void merge_8bit_unsigned(unsigned char *src_ptr,
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unsigned char *dst_ptr,
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int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = ((int)*src_ptr + (int)*(src_ptr + 1)) / 2;
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src_ptr += 2;
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}
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}
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static void merge_8bit_signed(signed char *src_ptr,
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signed char *dst_ptr,
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int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = ((int)*src_ptr + (int)*(src_ptr + 1)) / 2;
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src_ptr += 2;
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}
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}
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static void merge_16bit_unsigned(unsigned short *src_ptr,
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unsigned short *dst_ptr,
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int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = ((int)*src_ptr + (int)*(src_ptr + 1)) / 2;
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src_ptr += 2;
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}
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}
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static void merge_16bit_signed(signed short *src_ptr,
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signed short *dst_ptr,
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int size)
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{
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while (size-- > 0) {
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*dst_ptr++ = ((int)*src_ptr + (int)*(src_ptr + 1)) / 2;
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src_ptr += 2;
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}
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}
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static ssize_t voices_transfer(snd_pcm_plugin_t *plugin,
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char *src_ptr, size_t src_size,
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char *dst_ptr, size_t dst_size)
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{
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struct voices_private_data *data;
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if (plugin == NULL || src_ptr == NULL || src_size < 0 ||
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dst_ptr == NULL || dst_size < 0)
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return -EINVAL;
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if (src_size == 0)
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return 0;
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data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
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if (data == NULL)
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return -EINVAL;
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switch (data->width) {
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case 8:
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if (data->src_voices > data->dst_voices) {
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if (data->flg_signed) {
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merge_8bit_signed(src_ptr, dst_ptr, src_size / 2);
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} else {
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merge_8bit_unsigned(src_ptr, dst_ptr, src_size / 2);
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}
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} else {
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divide_8bit(src_ptr, dst_ptr, src_size);
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}
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break;
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case 16:
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if (data->src_voices > data->dst_voices) {
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if (data->flg_signed) {
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merge_16bit_signed((short *)src_ptr, (short *)dst_ptr, src_size / 4);
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} else {
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merge_16bit_unsigned((short *)src_ptr, (short *)dst_ptr, src_size / 4);
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}
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} else {
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divide_16bit((short *)src_ptr, (short *)dst_ptr, src_size / 2);
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}
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break;
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default:
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return -EINVAL;
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}
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return (src_size * data->dst_voices) / data->src_voices;
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}
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static ssize_t voices_src_size(snd_pcm_plugin_t *plugin, size_t size)
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{
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struct voices_private_data *data;
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if (plugin == NULL || size <= 0)
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return -EINVAL;
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data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
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return (size * data->src_voices) / data->dst_voices;
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}
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static ssize_t voices_dst_size(snd_pcm_plugin_t *plugin, size_t size)
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{
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struct voices_private_data *data;
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if (plugin == NULL || size <= 0)
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return -EINVAL;
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data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
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return (size * data->dst_voices) / data->src_voices;
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}
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int snd_pcm_plugin_build_voices(snd_pcm_format_t *src_format,
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snd_pcm_format_t *dst_format,
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snd_pcm_plugin_t **r_plugin)
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{
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struct voices_private_data *data;
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snd_pcm_plugin_t *plugin;
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if (r_plugin == NULL)
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return -EINVAL;
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*r_plugin = NULL;
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if (src_format->interleave != dst_format->interleave &&
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src_format->voices > 1)
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return -EINVAL;
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if (!dst_format->interleave)
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return -EINVAL;
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if (src_format->format != dst_format->format)
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return -EINVAL;
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if (src_format->rate != dst_format->rate)
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return -EINVAL;
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if (src_format->voices == dst_format->voices)
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return -EINVAL;
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if (src_format->voices < 1 || src_format->voices > 2 ||
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dst_format->voices < 1 || dst_format->voices > 2)
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return -EINVAL;
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if (src_format->format < SND_PCM_SFMT_S8 || src_format->format > SND_PCM_SFMT_U16_BE) {
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if (src_format->format != SND_PCM_SFMT_MU_LAW && src_format->format != SND_PCM_SFMT_A_LAW)
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return -EINVAL;
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}
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plugin = snd_pcm_plugin_build("voices conversion",
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sizeof(struct voices_private_data));
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if (plugin == NULL)
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return -ENOMEM;
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data = (struct voices_private_data *)snd_pcm_plugin_extra_data(plugin);
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data->src_voices = src_format->voices;
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data->dst_voices = dst_format->voices;
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data->width = snd_pcm_format_width(src_format->format);
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data->flg_signed = snd_pcm_format_signed(src_format->format);
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plugin->transfer = voices_transfer;
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plugin->src_size = voices_src_size;
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plugin->dst_size = voices_dst_size;
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*r_plugin = plugin;
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return 0;
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}
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