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/*
* Copyright (C) 2016 "IoT.bzh"
* Author Fulup Ar Foll <fulup@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* AfbCallBack (snd_ctl_hal_t *handle, int numid, void **response);
* AfbHalInit is mandatory and called with numid=0
*
* Syntaxe in .asoundrc file
* CrlLabel { cb MyFunctionName name "My_Second_Control" }
*/
#include <alsa/asoundlib.h>
#include <alsa/control_external.h>
#include <linux/soundcard.h>
#ifndef SOUND_HAL_MAX_CTLS
#define SOUND_HAL_MAX_CTLS 255
#endif
typedef enum {
CTLCB_INIT ,
CTLCB_CLOSE ,
CTLCB_ELEM_COUNT ,
CTLCB_ELEM_LIST ,
CTLCB_FIND_ELEM ,
CTLCB_FREE_KEY ,
CTLCB_GET_ATTRIBUTE ,
CTLCB_GET_INTEGER_INFO ,
CTLCB_GET_INTEGER64_INFO ,
CTLCB_GET_ENUMERATED_INFO ,
CTLCB_GET_ENUMERATED_NAME ,
CTLCB_READ_INTEGER ,
CTLCB_READ_INTEGER64 ,
CTLCB_READ_ENUMERATED ,
CTLCB_READ_BYTES ,
CTLCB_READ_IEC958 ,
CTLCB_WRITE_INTEGER ,
CTLCB_WRITE_INTEGER64 ,
CTLCB_WRITE_ENUMERATED ,
CTLCB_WRITE_BYTES ,
CTLCB_WRITE_IEC958 ,
CTLCB_SUBSCRIBE_EVENTS ,
CTLCB_READ_EVENT ,
CTLCB_POLL_DESCRIPTORS_COUNT ,
CTLCB_POLL_DESCRIPTORS
} snd_ctl_action_t;
typedef struct {
int ctlNumid;
const char *ctlName;
} snd_ctl_conf_t;
typedef struct {
int type;
int acc;
unsigned count;
} snd_ctl_get_attrib_t;
typedef struct {
int imin;
int imax;
int istep;
} snd_ctl_get_int_info_t;
typedef int(*snd_ctl_cb_t)(void *handle, snd_ctl_action_t action, snd_ctl_ext_key_t key, void *response);
typedef struct snd_ctl_hal {
snd_ctl_ext_t ext;
char *devid;
snd_ctl_t *ctlDev;
unsigned int ctlsCount;
void *dlHandle;
snd_ctl_conf_t ctls[SOUND_HAL_MAX_CTLS];
snd_ctl_elem_info_t *infos[SOUND_HAL_MAX_CTLS];
snd_ctl_cb_t cbs[SOUND_HAL_MAX_CTLS];
} snd_ctl_hal_t;
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