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pcm_ioplug.h
Go to the documentation of this file.
/*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#if !defined(__ALSA_PCM_EXTERNAL_H) && !defined(ALSA_LIBRARY_BUILD)
#warning "use #include <alsa/pcm_external.h>, <alsa/pcm_ioplug.h> should not be used directly"
#include <alsa/pcm_external.h>
#endif
#ifndef __ALSA_PCM_IOPLUG_H
#define __ALSA_PCM_IOPLUG_H
enum {
SND_PCM_IOPLUG_HW_ACCESS = 0,
SND_PCM_IOPLUG_HW_FORMAT,
SND_PCM_IOPLUG_HW_CHANNELS,
SND_PCM_IOPLUG_HW_RATE,
SND_PCM_IOPLUG_HW_PERIOD_BYTES,
SND_PCM_IOPLUG_HW_BUFFER_BYTES,
SND_PCM_IOPLUG_HW_PERIODS,
SND_PCM_IOPLUG_HW_PARAMS
};
typedef struct snd_pcm_ioplug snd_pcm_ioplug_t;
typedef struct snd_pcm_ioplug_callback snd_pcm_ioplug_callback_t;
#ifdef DOC_HIDDEN
/* redefine typedefs for stupid doxygen */
typedef snd_pcm_ioplug snd_pcm_ioplug_t;
typedef snd_pcm_ioplug_callback snd_pcm_ioplug_callback_t;
#endif
/*
* bit flags for additional conditions
*/
#define SND_PCM_IOPLUG_FLAG_LISTED (1<<0)
#define SND_PCM_IOPLUG_FLAG_MONOTONIC (1<<1)
#define SND_PCM_IOPLUG_FLAG_BOUNDARY_WA (1<<2)
/*
* Protocol version
*/
#define SND_PCM_IOPLUG_VERSION_MAJOR 1
#define SND_PCM_IOPLUG_VERSION_MINOR 0
#define SND_PCM_IOPLUG_VERSION_TINY 2
#define SND_PCM_IOPLUG_VERSION ((SND_PCM_IOPLUG_VERSION_MAJOR<<16) |\
(SND_PCM_IOPLUG_VERSION_MINOR<<8) |\
(SND_PCM_IOPLUG_VERSION_TINY))
struct snd_pcm_ioplug {
unsigned int version;
const char *name;
unsigned int flags;
int poll_fd;
unsigned int poll_events;
unsigned int mmap_rw;
const snd_pcm_ioplug_callback_t *callback;
void *private_data;
snd_pcm_t *pcm;
snd_pcm_stream_t stream;
snd_pcm_state_t state;
volatile snd_pcm_uframes_t appl_ptr;
volatile snd_pcm_uframes_t hw_ptr;
int nonblock;
snd_pcm_access_t access;
snd_pcm_format_t format;
unsigned int channels;
unsigned int rate;
snd_pcm_uframes_t period_size;
snd_pcm_uframes_t buffer_size;
};
struct snd_pcm_ioplug_callback {
int (*start)(snd_pcm_ioplug_t *io);
int (*stop)(snd_pcm_ioplug_t *io);
snd_pcm_sframes_t (*pointer)(snd_pcm_ioplug_t *io);
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);
int (*close)(snd_pcm_ioplug_t *io);
int (*hw_params)(snd_pcm_ioplug_t *io, snd_pcm_hw_params_t *params);
int (*hw_free)(snd_pcm_ioplug_t *io);
int (*sw_params)(snd_pcm_ioplug_t *io, snd_pcm_sw_params_t *params);
int (*prepare)(snd_pcm_ioplug_t *io);
int (*drain)(snd_pcm_ioplug_t *io);
int (*pause)(snd_pcm_ioplug_t *io, int enable);
int (*resume)(snd_pcm_ioplug_t *io);
int (*poll_descriptors_count)(snd_pcm_ioplug_t *io);
int (*poll_descriptors)(snd_pcm_ioplug_t *io, struct pollfd *pfd, unsigned int space);
int (*poll_revents)(snd_pcm_ioplug_t *io, struct pollfd *pfd, unsigned int nfds, unsigned short *revents);
void (*dump)(snd_pcm_ioplug_t *io, snd_output_t *out);
int (*delay)(snd_pcm_ioplug_t *io, snd_pcm_sframes_t *delayp);
snd_pcm_chmap_query_t **(*query_chmaps)(snd_pcm_ioplug_t *io);
snd_pcm_chmap_t *(*get_chmap)(snd_pcm_ioplug_t *io);
int (*set_chmap)(snd_pcm_ioplug_t *io, const snd_pcm_chmap_t *map);
};
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);
/* change PCM status */
int snd_pcm_ioplug_set_state(snd_pcm_ioplug_t *ioplug, snd_pcm_state_t state);
/* calucalte the available frames */
snd_pcm_uframes_t snd_pcm_ioplug_avail(const snd_pcm_ioplug_t * const ioplug,
const snd_pcm_uframes_t hw_ptr,
const snd_pcm_uframes_t appl_ptr);
snd_pcm_uframes_t snd_pcm_ioplug_hw_avail(const snd_pcm_ioplug_t * const ioplug,
const snd_pcm_uframes_t hw_ptr,
const snd_pcm_uframes_t appl_ptr);
#endif /* __ALSA_PCM_IOPLUG_H */
snd_output_t
struct _snd_output snd_output_t
Internal structure for an output object.
Definition output.h:60
snd_pcm_state_t
snd_pcm_state_t
Definition pcm.h:303
snd_pcm_hw_params_t
struct _snd_pcm_hw_params snd_pcm_hw_params_t
Definition pcm.h:68
snd_pcm_access_t
snd_pcm_access_t
Definition pcm.h:114
snd_pcm_sframes_t
long snd_pcm_sframes_t
Definition pcm.h:402
snd_pcm_sw_params_t
struct _snd_pcm_sw_params snd_pcm_sw_params_t
Definition pcm.h:71
snd_pcm_t
struct _snd_pcm snd_pcm_t
Definition pcm.h:422
snd_pcm_format_t
snd_pcm_format_t
Definition pcm.h:129
snd_pcm_uframes_t
unsigned long snd_pcm_uframes_t
Definition pcm.h:400
snd_pcm_stream_t
snd_pcm_stream_t
Definition pcm.h:105
snd_pcm_ioplug_params_reset
void snd_pcm_ioplug_params_reset(snd_pcm_ioplug_t *ioplug)
Reset ioplug parameters.
Definition pcm_ioplug.c:1138
snd_pcm_ioplug_avail
snd_pcm_uframes_t snd_pcm_ioplug_avail(const snd_pcm_ioplug_t *const ioplug, const snd_pcm_uframes_t hw_ptr, const snd_pcm_uframes_t appl_ptr)
Get the available frames. This function can be used to calculate the the available frames before call...
Definition pcm_ioplug.c:1255
snd_pcm_ioplug_mmap_areas
const snd_pcm_channel_area_t * snd_pcm_ioplug_mmap_areas(snd_pcm_ioplug_t *ioplug)
Get mmap area of ioplug.
Definition pcm_ioplug.c:1224
snd_pcm_ioplug_hw_avail
snd_pcm_uframes_t snd_pcm_ioplug_hw_avail(const snd_pcm_ioplug_t *const ioplug, const snd_pcm_uframes_t hw_ptr, const snd_pcm_uframes_t appl_ptr)
Get the available frames. This function can be used to calculate the the available frames before call...
Definition pcm_ioplug.c:1270
snd_pcm_ioplug_set_state
int snd_pcm_ioplug_set_state(snd_pcm_ioplug_t *ioplug, snd_pcm_state_t state)
Change the ioplug PCM status.
Definition pcm_ioplug.c:1241
snd_pcm_ioplug_create
int snd_pcm_ioplug_create(snd_pcm_ioplug_t *ioplug, const char *name, snd_pcm_stream_t stream, int mode)
Create an ioplug instance.
Definition pcm_ioplug.c:1074
snd_pcm_ioplug_set_param_minmax
int snd_pcm_ioplug_set_param_minmax(snd_pcm_ioplug_t *ioplug, int type, unsigned int min, unsigned int max)
Set parameter as the min/max values.
Definition pcm_ioplug.c:1179
snd_pcm_ioplug_reinit_status
int snd_pcm_ioplug_reinit_status(snd_pcm_ioplug_t *ioplug)
Reinitialize the poll and mmap status.
Definition pcm_ioplug.c:1204
snd_pcm_ioplug_set_param_list
int snd_pcm_ioplug_set_param_list(snd_pcm_ioplug_t *ioplug, int type, unsigned int num_list, const unsigned int *list)
Set parameter as the list.
Definition pcm_ioplug.c:1155
snd_pcm_ioplug_delete
int snd_pcm_ioplug_delete(snd_pcm_ioplug_t *ioplug)
Delete the ioplug instance.
Definition pcm_ioplug.c:1126
snd_pcm_channel_area_t
Definition pcm.h:496
snd_pcm_chmap_query_t
Definition pcm.h:652
snd_pcm_chmap_t
Definition pcm.h:646
format
uint16_t format
Definition ump_msg.h:2
flags
uint8_t flags
Definition ump_msg.h:6
type
uint8_t type
Definition ump_msg.h:1