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Add filter-type external plugin SDK

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Added the SDK for filter-type PCM plugins.
Share some codes with ioplug.
This commit is contained in:
Takashi Iwai 2005-02-14 13:33:08 +00:00
parent 4ea51d8201
commit 5eb794fe0b
9 changed files with 672 additions and 137 deletions
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96
include/pcm_extplug.h Normal file
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/*
* ALSA external PCM plugin SDK (draft version)
*
* Copyright (c) 2005 Takashi Iwai <tiwai@suse.de>
*
* 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
*
*/
#ifndef __ALSA_PCM_EXTPLUG_H
#define __ALSA_PCM_EXTPLUG_H
/* hw constraints */
enum {
SND_PCM_EXTPLUG_HW_FORMAT,
SND_PCM_EXTPLUG_HW_CHANNELS,
SND_PCM_EXTPLUG_HW_PARAMS
};
typedef struct snd_pcm_extplug snd_pcm_extplug_t;
typedef struct snd_pcm_extplug_callback snd_pcm_extplug_callback_t;
/* exported pcm data */
struct snd_pcm_extplug {
/* must be filled before calling snd_pcm_extplug_create() */
const char *name;
const snd_pcm_extplug_callback_t *callback;
void *private_data;
/* filled by snd_pcm_extplug_open() */
snd_pcm_t *pcm;
/* read-only status */
snd_pcm_stream_t stream;
/* filled in hw_params */
snd_pcm_format_t format;
snd_pcm_subformat_t subformat;
unsigned int channels;
unsigned int rate;
snd_pcm_format_t slave_format;
snd_pcm_subformat_t slave_subformat;
unsigned int slave_channels;
};
/* callback table */
struct snd_pcm_extplug_callback {
/* required */
snd_pcm_sframes_t (*transfer)(snd_pcm_extplug_t *ext,
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,
snd_pcm_uframes_t size);
int (*close)(snd_pcm_extplug_t *ext);
int (*hw_params)(snd_pcm_extplug_t *ext, snd_pcm_hw_params_t *params);
int (*hw_free)(snd_pcm_extplug_t *ext);
void (*dump)(snd_pcm_extplug_t *ext, snd_output_t *out);
};
int snd_pcm_extplug_create(snd_pcm_extplug_t *ext, const char *name,
snd_config_t *root, snd_config_t *slave_conf,
snd_pcm_stream_t stream, int mode);
int snd_pcm_extplug_delete(snd_pcm_extplug_t *ext);
/* clear hw_parameter setting */
void snd_pcm_extplug_params_reset(snd_pcm_extplug_t *ext);
/* hw_parameter setting */
int snd_pcm_extplug_set_param_list(snd_pcm_extplug_t *extplug, int type, unsigned int num_list, const unsigned int *list);
int snd_pcm_extplug_set_param_minmax(snd_pcm_extplug_t *extplug, int type, unsigned int min, unsigned int max);
int snd_pcm_extplug_set_slave_param_list(snd_pcm_extplug_t *extplug, int type, unsigned int num_list, const unsigned int *list);
int snd_pcm_extplug_set_slave_param_minmax(snd_pcm_extplug_t *extplug, int type, unsigned int min, unsigned int max);
static inline int snd_pcm_extplug_set_param(snd_pcm_extplug_t *extplug, int type, unsigned int val)
{
return snd_pcm_extplug_set_param_list(extplug, type, 1, &val);
}
static inline int snd_pcm_extplug_set_slave_param(snd_pcm_extplug_t *extplug, int type, unsigned int val)
{
return snd_pcm_extplug_set_slave_param_list(extplug, type, 1, &val);
}
#endif /* __ALSA_PCM_EXTPLUG_H */