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/**
* \file include/pcm_extplug.h
* \brief External Filter-Plugin SDK
* \author Takashi Iwai <tiwai@suse.de>
* \date 2005
*
* External Filter-Plugin SDK
*/
/*
* 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
/**
* \defgroup PCM_ExtPlug External Filter plugin SDK
* \ingroup Plugin_SDK
* See the \ref pcm page for more details.
* \{
*/
/** hw constraints for extplug */
enum {
SND_PCM_EXTPLUG_HW_FORMAT, /**< format */
SND_PCM_EXTPLUG_HW_CHANNELS, /**< channels */
SND_PCM_EXTPLUG_HW_PARAMS /**< max number of hw constraints */
};
/** Handle of external filter plugin */
typedef struct snd_pcm_extplug snd_pcm_extplug_t;
/** Callback table of extplug */
typedef struct snd_pcm_extplug_callback snd_pcm_extplug_callback_t;
/*
* Protocol version
*/
#define SND_PCM_EXTPLUG_VERSION_MAJOR 1 /**< Protocol major version */
#define SND_PCM_EXTPLUG_VERSION_MINOR 0 /**< Protocol minor version */
#define SND_PCM_EXTPLUG_VERSION_TINY 2 /**< Protocol tiny version */
/**
* Filter-plugin protocol version
*/
#define SND_PCM_EXTPLUG_VERSION ((SND_PCM_EXTPLUG_VERSION_MAJOR<<16) |\
(SND_PCM_EXTPLUG_VERSION_MINOR<<8) |\
(SND_PCM_EXTPLUG_VERSION_TINY))
/** Handle of extplug */
struct snd_pcm_extplug {
/**
* protocol version; #SND_PCM_EXTPLUG_VERSION must be filled here
* before calling #snd_pcm_extplug_create()
*/
unsigned int version;
/**
* name of this plugin; must be filled before calling #snd_pcm_extplug_create()
*/
const char *name;
/**
* callbacks of this plugin; must be filled before calling #snd_pcm_extplug_create()
*/
const snd_pcm_extplug_callback_t *callback;
/**
* private data, which can be used freely in the driver callbacks
*/
void *private_data;
/**
* PCM handle filled by #snd_pcm_extplug_create()
*/
snd_pcm_t *pcm;
/**
* stream direction; read-only status
*/
snd_pcm_stream_t stream;
/**
* format hw parameter; filled after hw_params is caled
*/
snd_pcm_format_t format;
/**
* subformat hw parameter; filled after hw_params is caled
*/
snd_pcm_subformat_t subformat;
/**
* channels hw parameter; filled after hw_params is caled
*/
unsigned int channels;
/**
* rate hw parameter; filled after hw_params is caled
*/
unsigned int rate;
/**
* slave_format hw parameter; filled after hw_params is caled
*/
snd_pcm_format_t slave_format;
/**
* slave_subformat hw parameter; filled after hw_params is caled
*/
snd_pcm_subformat_t slave_subformat;
/**
* slave_channels hw parameter; filled after hw_params is caled
*/
unsigned int slave_channels;
};
/** Callback table of extplug */
struct snd_pcm_extplug_callback {
/**
* transfer between source and destination; this is a required callback
*/
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);
/**
* close the PCM; optional
*/
int (*close)(snd_pcm_extplug_t *ext);
/**
* hw_params; optional
*/
int (*hw_params)(snd_pcm_extplug_t *ext, snd_pcm_hw_params_t *params);
/**
* hw_free; optional
*/
int (*hw_free)(snd_pcm_extplug_t *ext);
/**
* dump; optional
*/
void (*dump)(snd_pcm_extplug_t *ext, snd_output_t *out);
/**
* init; optional initialization called at prepare or reset
*/
int (*init)(snd_pcm_extplug_t *ext);
/**
* query the channel maps; optional; since v1.0.2
*/
int **(*query_chmaps)(snd_pcm_extplug_t *ext);
/**
* get the channel map; optional; since v1.0.2
*/
int *(*get_chmap)(snd_pcm_extplug_t *ext);
/**
* set the channel map; optional; since v1.0.2
*/
int (*set_chmap)(snd_pcm_extplug_t *ext, const int *map);
};
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);
/**
* set the parameter constraint with a single value
*/
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);
}
/**
* set the parameter constraint for slave PCM with a single value
*/
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 */
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