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/*
* PCM - Common plugin code
* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "iatomic.h"
#include "pcm_generic.h"
typedef snd_pcm_uframes_t (*snd_pcm_slave_xfer_areas_func_t)
(snd_pcm_t *pcm,
const snd_pcm_channel_area_t *areas,
snd_pcm_uframes_t offset,
snd_pcm_uframes_t size,
const snd_pcm_channel_area_t *slave_areas,
snd_pcm_uframes_t slave_offset,
snd_pcm_uframes_t *slave_sizep);
typedef snd_pcm_sframes_t (*snd_pcm_slave_xfer_areas_undo_func_t)
(snd_pcm_t *pcm,
const snd_pcm_channel_area_t *res_areas, /* result areas */
snd_pcm_uframes_t res_offset, /* offset of result areas */
snd_pcm_uframes_t res_size, /* size of result areas */
snd_pcm_uframes_t slave_undo_size);
typedef struct {
snd_pcm_generic_t gen;
snd_pcm_slave_xfer_areas_func_t read;
snd_pcm_slave_xfer_areas_func_t write;
snd_pcm_slave_xfer_areas_undo_func_t undo_read;
snd_pcm_slave_xfer_areas_undo_func_t undo_write;
int (*init)(snd_pcm_t *pcm);
snd_pcm_uframes_t appl_ptr, hw_ptr;
snd_atomic_write_t watom;
} snd_pcm_plugin_t;
/* make local functions really local */
#define snd_pcm_plugin_init \
snd1_pcm_plugin_init
#define snd_pcm_plugin_fast_ops \
snd1_pcm_plugin_fast_ops
#define snd_pcm_plugin_undo_read_generic \
snd1_pcm_plugin_undo_read_generic
#define snd_pcm_plugin_undo_write_generic \
snd1_pcm_plugin_undo_write_generic
#define snd_pcm_plugin_rewind \
snd1_pcm_plugin_rewind
#define snd_pcm_plugin_forward \
snd1_pcm_plugin_forward
void snd_pcm_plugin_init(snd_pcm_plugin_t *plugin);
snd_pcm_sframes_t snd_pcm_plugin_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
snd_pcm_sframes_t snd_pcm_plugin_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
extern const snd_pcm_fast_ops_t snd_pcm_plugin_fast_ops;
snd_pcm_sframes_t snd_pcm_plugin_undo_read_generic
(snd_pcm_t *pcm,
const snd_pcm_channel_area_t *res_areas, /* result areas */
snd_pcm_uframes_t res_offset, /* offset of result areas */
snd_pcm_uframes_t res_size, /* size of result areas */
snd_pcm_uframes_t slave_undo_size);
snd_pcm_sframes_t snd_pcm_plugin_undo_write_generic
(snd_pcm_t *pcm,
const snd_pcm_channel_area_t *res_areas, /* result areas */
snd_pcm_uframes_t res_offset, /* offset of result areas */
snd_pcm_uframes_t res_size, /* size of result areas */
snd_pcm_uframes_t slave_undo_size);
/* make local functions really local */
#define snd_pcm_linear_get_index snd1_pcm_linear_get_index
#define snd_pcm_linear_put_index snd1_pcm_linear_put_index
#define snd_pcm_linear_convert_index snd1_pcm_linear_convert_index
#define snd_pcm_linear_convert snd1_pcm_linear_convert
#define snd_pcm_linear_getput snd1_pcm_linear_getput
#define snd_pcm_alaw_decode snd1_pcm_alaw_decode
#define snd_pcm_alaw_encode snd1_pcm_alaw_encode
#define snd_pcm_mulaw_decode snd1_pcm_mulaw_decode
#define snd_pcm_mulaw_encode snd1_pcm_mulaw_encode
#define snd_pcm_adpcm_decode snd1_pcm_adpcm_decode
#define snd_pcm_adpcm_encode snd1_pcm_adpcm_encode
int snd_pcm_linear_get_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format);
int snd_pcm_linear_put_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format);
int snd_pcm_linear_convert_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format);
void snd_pcm_linear_convert(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset,
const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset,
unsigned int channels, snd_pcm_uframes_t frames,
unsigned int convidx);
void snd_pcm_linear_getput(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset,
const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset,
unsigned int channels, snd_pcm_uframes_t frames,
unsigned int get_idx, unsigned int put_idx);
void snd_pcm_alaw_decode(const snd_pcm_channel_area_t *dst_areas,
snd_pcm_uframes_t dst_offset,
const snd_pcm_channel_area_t *src_areas,
snd_pcm_uframes_t src_offset,
unsigned int channels, snd_pcm_uframes_t frames,
unsigned int putidx);
void snd_pcm_alaw_encode(const snd_pcm_channel_area_t *dst_areas,
snd_pcm_uframes_t dst_offset,
const snd_pcm_channel_area_t *src_areas,
snd_pcm_uframes_t src_offset,
unsigned int channels, snd_pcm_uframes_t frames,
unsigned int getidx);
void snd_pcm_mulaw_decode(const snd_pcm_channel_area_t *dst_areas,
snd_pcm_uframes_t dst_offset,
const snd_pcm_channel_area_t *src_areas,
snd_pcm_uframes_t src_offset,
unsigned int channels, snd_pcm_uframes_t frames,
unsigned int putidx);
void snd_pcm_mulaw_encode(const snd_pcm_channel_area_t *dst_areas,
snd_pcm_uframes_t dst_offset,
const snd_pcm_channel_area_t *src_areas,
snd_pcm_uframes_t src_offset,
unsigned int channels, snd_pcm_uframes_t frames,
unsigned int getidx);
typedef struct _snd_pcm_adpcm_state {
int pred_val; /* Calculated predicted value */
int step_idx; /* Previous StepSize lookup index */
} snd_pcm_adpcm_state_t;
void snd_pcm_adpcm_decode(const snd_pcm_channel_area_t *dst_areas,
snd_pcm_uframes_t dst_offset,
const snd_pcm_channel_area_t *src_areas,
snd_pcm_uframes_t src_offset,
unsigned int channels, snd_pcm_uframes_t frames,
unsigned int putidx,
snd_pcm_adpcm_state_t *states);
void snd_pcm_adpcm_encode(const snd_pcm_channel_area_t *dst_areas,
snd_pcm_uframes_t dst_offset,
const snd_pcm_channel_area_t *src_areas,
snd_pcm_uframes_t src_offset,
unsigned int channels, snd_pcm_uframes_t frames,
unsigned int getidx,
snd_pcm_adpcm_state_t *states);
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