control_external.h

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/*
 *   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
 *
 */
 
#ifndef __ALSA_CONTROL_EXTERNAL_H
#define __ALSA_CONTROL_EXTERNAL_H
 
#ifndef __ASOUNDLIB_LOCAL
#include <alsa/asoundlib.h>
#endif
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define SND_CTL_PLUGIN_ENTRY(name) _snd_ctl_##name##_open
 
#define SND_CTL_PLUGIN_SYMBOL(name) SND_DLSYM_BUILD_VERSION(SND_CTL_PLUGIN_ENTRY(name), SND_CONTROL_DLSYM_VERSION);
 
#define SND_CTL_PLUGIN_DEFINE_FUNC(plugin) \
int SND_CTL_PLUGIN_ENTRY(plugin) (snd_ctl_t **handlep, const char *name,\
                  snd_config_t *root, snd_config_t *conf, int mode)
 
typedef struct snd_ctl_ext snd_ctl_ext_t;
typedef struct snd_ctl_ext_callback snd_ctl_ext_callback_t;
typedef unsigned long snd_ctl_ext_key_t;
#ifdef DOC_HIDDEN
/* redefine typedef's for stupid doxygen */
typedef snd_ctl_ext snd_ctl_ext_t;
typedef snd_ctl_ext_callback snd_ctl_ext_callback_t;
#endif
typedef int (snd_ctl_ext_tlv_rw_t)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, int op_flag, unsigned int numid,
                   unsigned int *tlv, unsigned int tlv_size);
 
/*
 * Protocol version
 */
#define SND_CTL_EXT_VERSION_MAJOR   1   
#define SND_CTL_EXT_VERSION_MINOR   0   
#define SND_CTL_EXT_VERSION_TINY    1   
#define SND_CTL_EXT_VERSION     ((SND_CTL_EXT_VERSION_MAJOR<<16) |\
                     (SND_CTL_EXT_VERSION_MINOR<<8) |\
                     (SND_CTL_EXT_VERSION_TINY))
 
struct snd_ctl_ext {
    unsigned int version;
    int card_idx;
    char id[16];
    char driver[16];
    char name[32];
    char longname[80];
    char mixername[80];
    int poll_fd;
 
    const snd_ctl_ext_callback_t *callback;
    void *private_data;
    snd_ctl_t *handle;
 
    int nonblock;           
    int subscribed;         
    union {
        snd_ctl_ext_tlv_rw_t *c;
        const unsigned int *p;
    } tlv;
};
 
struct snd_ctl_ext_callback {
    void (*close)(snd_ctl_ext_t *ext);
    int (*elem_count)(snd_ctl_ext_t *ext);
    int (*elem_list)(snd_ctl_ext_t *ext, unsigned int offset, snd_ctl_elem_id_t *id);
    snd_ctl_ext_key_t (*find_elem)(snd_ctl_ext_t *ext, const snd_ctl_elem_id_t *id);
    void (*free_key)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key);
    int (*get_attribute)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
                 int *type, unsigned int *acc, unsigned int *count);
    int (*get_integer_info)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
                long *imin, long *imax, long *istep);
    int (*get_integer64_info)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key,
                  int64_t *imin, int64_t *imax, int64_t *istep);
    int (*get_enumerated_info)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items);
    int (*get_enumerated_name)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int item,
                   char *name, size_t name_max_len);
    int (*read_integer)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value);
    int (*read_integer64)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, int64_t *value);
    int (*read_enumerated)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items);
    int (*read_bytes)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned char *data,
              size_t max_bytes);
    int (*read_iec958)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, snd_aes_iec958_t *iec958);
    int (*write_integer)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value);
    int (*write_integer64)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, int64_t *value);
    int (*write_enumerated)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items);
    int (*write_bytes)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned char *data,
               size_t max_bytes);
    int (*write_iec958)(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, snd_aes_iec958_t *iec958);
    void (*subscribe_events)(snd_ctl_ext_t *ext, int subscribe);
    int (*read_event)(snd_ctl_ext_t *ext, snd_ctl_elem_id_t *id, unsigned int *event_mask);
    int (*poll_descriptors_count)(snd_ctl_ext_t *ext);
    int (*poll_descriptors)(snd_ctl_ext_t *ext, struct pollfd *pfds, unsigned int space);
    int (*poll_revents)(snd_ctl_ext_t *ext, struct pollfd *pfds, unsigned int nfds, unsigned short *revents);
};
 
typedef enum snd_ctl_ext_access {
    SND_CTL_EXT_ACCESS_READ = (1<<0),
    SND_CTL_EXT_ACCESS_WRITE = (1<<1),
    SND_CTL_EXT_ACCESS_READWRITE = (3<<0),
    SND_CTL_EXT_ACCESS_VOLATILE = (1<<2),
    SND_CTL_EXT_ACCESS_TLV_READ = (1<<4),
    SND_CTL_EXT_ACCESS_TLV_WRITE = (1<<5),
    SND_CTL_EXT_ACCESS_TLV_READWRITE = (3<<4),
    SND_CTL_EXT_ACCESS_TLV_COMMAND = (1<<6),
    SND_CTL_EXT_ACCESS_INACTIVE = (1<<8),
    SND_CTL_EXT_ACCESS_TLV_CALLBACK = (1<<28),
} snd_ctl_ext_access_t;
 
#define SND_CTL_EXT_KEY_NOT_FOUND   (snd_ctl_ext_key_t)(-1)
 
int snd_ctl_ext_create(snd_ctl_ext_t *ext, const char *name, int mode);
int snd_ctl_ext_delete(snd_ctl_ext_t *ext);
 
#ifdef __cplusplus
}
#endif
 
#endif /* __ALSA_CONTROL_EXTERNAL_H */