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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 0 /**< 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);
- };
-
-
- 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 */
-