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- /**
- * \file include/pcm_ioplug.h
- * \brief External I/O-Plugin SDK
- * \author Takashi Iwai <tiwai@suse.de>
- * \date 2005
- *
- * External I/O-Plugin SDK
- */
-
- /*
- * ALSA external PCM plugin SDK
- *
- * 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_IOPLUG_H
- #define __ALSA_PCM_IOPLUG_H
-
- /**
- * \defgroup PCM_IOPlug External I/O plugin SDK
- * \ingroup Plugin_SDK
- * See the \ref pcm page for more details.
- * \{
- */
-
- /** hw constraints for ioplug */
- enum {
- SND_PCM_IOPLUG_HW_ACCESS = 0, /**< access type */
- SND_PCM_IOPLUG_HW_FORMAT, /**< format */
- SND_PCM_IOPLUG_HW_CHANNELS, /**< channels */
- SND_PCM_IOPLUG_HW_RATE, /**< rate */
- SND_PCM_IOPLUG_HW_PERIOD_BYTES, /**< period bytes */
- SND_PCM_IOPLUG_HW_BUFFER_BYTES, /**< buffer bytes */
- SND_PCM_IOPLUG_HW_PERIODS, /**< number of periods */
- SND_PCM_IOPLUG_HW_PARAMS /**< max number of hw constraints */
- };
-
- /** I/O plugin handle */
- typedef struct snd_pcm_ioplug snd_pcm_ioplug_t;
- /** Callback table of ioplug */
- typedef struct snd_pcm_ioplug_callback snd_pcm_ioplug_callback_t;
-
- /**
- * bit flags for additional conditions
- */
- #define SND_PCM_IOPLUG_FLAG_LISTED (1<<0) /* list up this PCM */
-
- /*
- * Protocol version
- */
- #define SND_PCM_IOPLUG_VERSION_MAJOR 1 /**< Protocol major version */
- #define SND_PCM_IOPLUG_VERSION_MINOR 0 /**< Protocol minor version */
- #define SND_PCM_IOPLUG_VERSION_TINY 0 /**< Protocol tiny version */
- /**
- * IO-plugin protocol version
- */
- #define SND_PCM_IOPLUG_VERSION ((SND_PCM_IOPLUG_VERSION_MAJOR<<16) |\
- (SND_PCM_IOPLUG_VERSION_MINOR<<8) |\
- (SND_PCM_IOPLUG_VERSION_TINY))
-
- /** Handle of ioplug */
- struct snd_pcm_ioplug {
- /**
- * protocol version; #SND_PCM_IOPLUG_VERSION must be filled here
- * before calling #snd_pcm_ioplug_create()
- */
- unsigned int version;
- /**
- * name of this plugin; must be filled before calling #snd_pcm_ioplug_create()
- */
- const char *name;
- unsigned int flags; /**< SND_PCM_IOPLUG_FLAG_XXX */
- int poll_fd; /**< poll file descriptor */
- unsigned int poll_events; /**< poll events */
- unsigned int mmap_rw; /**< pseudo mmap mode */
- /**
- * callbacks of this plugin; must be filled before calling #snd_pcm_ioplug_create()
- */
- const snd_pcm_ioplug_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;
-
- snd_pcm_stream_t stream; /**< stream direcion; read-only */
- snd_pcm_state_t state; /**< current PCM state; read-only */
- volatile snd_pcm_uframes_t appl_ptr; /**< application pointer; read-only */
- volatile snd_pcm_uframes_t hw_ptr; /**< hw pointer; read-only */
- int nonblock; /**< non-block mode; read-only */
-
- snd_pcm_access_t access; /**< access type; filled after hw_params is called */
- snd_pcm_format_t format; /**< PCM format; filled after hw_params is called */
- unsigned int channels; /**< number of channels; filled after hw_params is called */
- unsigned int rate; /**< rate; filled after hw_params is called */
- snd_pcm_uframes_t period_size; /**< period size; filled after hw_params is called */
- snd_pcm_uframes_t buffer_size; /**< buffer size; filled after hw_params is called */
- };
-
- /** Callback table of ioplug */
- struct snd_pcm_ioplug_callback {
- /**
- * start the PCM; required
- */
- int (*start)(snd_pcm_ioplug_t *io);
- /**
- * stop the PCM; required
- */
- int (*stop)(snd_pcm_ioplug_t *io);
- /**
- * get the current DMA position; required
- */
- snd_pcm_sframes_t (*pointer)(snd_pcm_ioplug_t *io);
- /**
- * transfer the data; optional
- */
- snd_pcm_sframes_t (*transfer)(snd_pcm_ioplug_t *io,
- const snd_pcm_channel_area_t *areas,
- snd_pcm_uframes_t offset,
- snd_pcm_uframes_t size);
- /**
- * close the PCM; optional
- */
- int (*close)(snd_pcm_ioplug_t *io);
- /**
- * hw_params; optional
- */
- int (*hw_params)(snd_pcm_ioplug_t *io, snd_pcm_hw_params_t *params);
- /**
- * hw_free; optional
- */
- int (*hw_free)(snd_pcm_ioplug_t *io);
- /**
- * sw_params; optional
- */
- int (*sw_params)(snd_pcm_ioplug_t *io, snd_pcm_sw_params_t *params);
- /**
- * prepare; optional
- */
- int (*prepare)(snd_pcm_ioplug_t *io);
- /**
- * drain; optional
- */
- int (*drain)(snd_pcm_ioplug_t *io);
- /**
- * toggle pause; optional
- */
- int (*pause)(snd_pcm_ioplug_t *io, int enable);
- /**
- * resume; optional
- */
- int (*resume)(snd_pcm_ioplug_t *io);
- /**
- * poll descriptors count; optional
- */
- int (*poll_descriptors_count)(snd_pcm_ioplug_t *io);
- /**
- * poll descriptors; optional
- */
- int (*poll_descriptors)(snd_pcm_ioplug_t *io, struct pollfd *pfd, unsigned int space);
- /**
- * mangle poll events; optional
- */
- int (*poll_revents)(snd_pcm_ioplug_t *io, struct pollfd *pfd, unsigned int nfds, unsigned short *revents);
- /**
- * dump; optional
- */
- void (*dump)(snd_pcm_ioplug_t *io, snd_output_t *out);
- };
-
-
- int snd_pcm_ioplug_create(snd_pcm_ioplug_t *io, const char *name,
- snd_pcm_stream_t stream, int mode);
- int snd_pcm_ioplug_delete(snd_pcm_ioplug_t *io);
-
- /* update poll_fd and mmap_rw */
- int snd_pcm_ioplug_reinit_status(snd_pcm_ioplug_t *ioplug);
-
- /* get a mmap area (for mmap_rw only) */
- const snd_pcm_channel_area_t *snd_pcm_ioplug_mmap_areas(snd_pcm_ioplug_t *ioplug);
-
- /* clear hw_parameter setting */
- void snd_pcm_ioplug_params_reset(snd_pcm_ioplug_t *io);
-
- /* hw_parameter setting */
- int snd_pcm_ioplug_set_param_minmax(snd_pcm_ioplug_t *io, int type, unsigned int min, unsigned int max);
- int snd_pcm_ioplug_set_param_list(snd_pcm_ioplug_t *io, int type, unsigned int num_list, const unsigned int *list);
-
- /** \} */
-
- #endif /* __ALSA_PCM_IOPLUG_H */
-