From 070ccac33d65c651c972dfab9c6148e43d8d5d8e Mon Sep 17 00:00:00 2001 From: fulup Date: Thu, 3 Aug 2017 12:00:41 +0200 Subject: Initial Working Version on Alsa Policy-Policy-Hook --- Alsa-Plugin/_Alsa-Hal-plugin/AlsaHalPlugCtl.c | 423 ++++++++++++++++++++++++++ 1 file changed, 423 insertions(+) create mode 100644 Alsa-Plugin/_Alsa-Hal-plugin/AlsaHalPlugCtl.c (limited to 'Alsa-Plugin/_Alsa-Hal-plugin/AlsaHalPlugCtl.c') diff --git a/Alsa-Plugin/_Alsa-Hal-plugin/AlsaHalPlugCtl.c b/Alsa-Plugin/_Alsa-Hal-plugin/AlsaHalPlugCtl.c new file mode 100644 index 0000000..5e92dd6 --- /dev/null +++ b/Alsa-Plugin/_Alsa-Hal-plugin/AlsaHalPlugCtl.c @@ -0,0 +1,423 @@ +/* + * Copyright (C) 2016 "IoT.bzh" + * Author Fulup Ar Foll + * + * 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. + * + * Testing: + * 1) Copy generated plugin [libasound_module_pcm_afbhal.so] in alsa-lib/ dir visible from LD_LIBRARY_PATH (eg: /usr/lib64/alsa-lib) + * 2) Create a ~/.asounrc file base on following template + * ctl.agl_hal { + * type afbhal + * devid "hw:4" + * cblib "afbhal_cb_sample.so" + * ctls { + * # ctlLabel {numid integer name "Alsa Ctl Name"} + * MasterSwitch { numid 4 name "My_First_Control" } + * MasterVol { numid 5 name "My_Second_Control" } + * CB_sample { ctlcb @AfbHalSampleCB name "My_Sample_Callback"} + * } + * pcm.agl_hal { + * type copy # Copy PCM + * slave "hw:4" # Slave name + * } + * + * } + * 3) Test with + * - amixer -Dagl_hal controls # should list all your controls + * - amixer -Dagl_hal cget numid=1 + * - amixer -Dagl_hal cset numid=1 '10,20' + */ + + +#include +#include +#include "AlsaHalPlug.h" +#include + +static snd_ctl_ext_key_t AfbHalElemFind(snd_ctl_ext_t *ext, const snd_ctl_elem_id_t *id) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + snd_ctl_ext_key_t key = NULL; + + int numid = snd_ctl_elem_id_get_numid(id); + if (numid > 0) { + if (numid > plughandle->ctlsCount) goto OnErrorExit; + key = (snd_ctl_ext_key_t) numid - 1; + goto SucessExit; + } + + const char *ctlName = snd_ctl_elem_id_get_name(id); + if (ctlName == NULL) goto OnErrorExit; + + for (int idx = 0; idx < plughandle->ctlsCount; idx++) { + if (!strcmp(ctlName, plughandle->ctls[idx].ctlName)) { + key = idx; + goto SucessExit; + } + } + +SucessExit: + return key; + +OnErrorExit: + return -1; +} + +static int AfbHalGetAttrib(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, int *type, unsigned int *acc, unsigned int *count) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + snd_ctl_elem_info_t *elemInfo = plughandle->infos[key]; + snd_ctl_cb_t callback = plughandle->cbs[key]; + + + // search for equivalent NUMID in effective sound card + if (elemInfo) { + *type = snd_ctl_elem_info_get_type(elemInfo); + *count = snd_ctl_elem_info_get_count(elemInfo); + *acc = SND_CTL_EXT_ACCESS_READWRITE; // Future ToBeDone + return 0; + } + + if (callback) { + snd_ctl_get_attrib_t item; + + int err = callback(plughandle, CTLCB_GET_ATTRIBUTE, key, &item); + if (!err) { + *type = item.type; + *acc = item.acc; + *count = item.count; + } + return err; + } + + return -1; +} + +static int AfbHalGetIntInfo(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *imin, long *imax, long *istep) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + snd_ctl_elem_info_t *elemInfo = plughandle->infos[key]; + snd_ctl_cb_t callback = plughandle->cbs[key]; + + if (elemInfo) { + + // Should be normalised to make everything 0-100% + *imin = (long) snd_ctl_elem_info_get_min(elemInfo); + *imax = (long) snd_ctl_elem_info_get_min(elemInfo); + *istep = (long) snd_ctl_elem_info_get_min(elemInfo); + return 0; + } + + if (callback) { + snd_ctl_get_int_info_t item; + + int err = callback(plughandle, CTLCB_GET_INTEGER_INFO, key, &item); + if (!err) { + *imin = item.imin; + *imax = item.imax; + *istep = item.istep; + } + return err; + } + + return -1; +} + +static int AfbHalGetEnumInfo(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + snd_ctl_elem_info_t *elemInfo = plughandle->infos[key]; + snd_ctl_cb_t callback = plughandle->cbs[key]; + + if (elemInfo) *items = snd_ctl_elem_info_get_items(elemInfo); + if (callback) callback(plughandle, CTLCB_GET_ENUMERATED_INFO, key, items); + + return 0; +} + +static int AfbHalGetEnumName(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int item, char *name, size_t name_max_len) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + snd_ctl_elem_info_t *elemInfo = plughandle->infos[key]; + + //name= snd_ctl_elem_info_get_item_name(elemInfo); + return 0; +} + +static int AfbHalReadInt(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + snd_ctl_elem_info_t *elemInfo = plughandle->infos[key]; + + return 0; +} + +static int AfbHalReadEnumerate(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + + return 0; +} + +static int AfbHalWriteInt(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, long *value) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + + return 0; +} + +static int AfbHalWriteEnum(snd_ctl_ext_t *ext, snd_ctl_ext_key_t key, unsigned int *items) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + + return 0; +} + +static int AfbHalEventRead(snd_ctl_ext_t *ext, snd_ctl_elem_id_t *id, unsigned int *event_mask) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + + return -EAGAIN; +} + +static int AfbHalElemList(snd_ctl_ext_t *ext, unsigned int offset, snd_ctl_elem_id_t *id) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + + snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER); + snd_ctl_elem_id_set_name(id, plughandle->ctls[offset].ctlName); + + return 0; +} + +static int AfbHalElemCount(snd_ctl_ext_t *ext) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + int count = plughandle->ctlsCount; + return count; +} + +static void AfbHalClose(snd_ctl_ext_t *ext) { + snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) ext->private_data; + int err; + + for (int idx = 0; idx < plughandle->ctlsCount; idx++) { + if (plughandle->ctls[idx].ctlName) free((void*) plughandle->ctls[idx].ctlName); + } + + err = snd_ctl_close(plughandle->ctlDev); + if (err) SNDERR("Fail Close sndctl: devid=%s err=%s", plughandle->devid, snd_strerror(err)); + + if (plughandle->devid) free(plughandle->devid); + free(plughandle); +} + +static snd_ctl_ext_callback_t afbHalCBs = { + .close = AfbHalClose, + .elem_count = AfbHalElemCount, + .elem_list = AfbHalElemList, + .find_elem = AfbHalElemFind, + .get_attribute = AfbHalGetAttrib, + .get_integer_info = AfbHalGetIntInfo, + .get_enumerated_info = AfbHalGetEnumInfo, + .get_enumerated_name = AfbHalGetEnumName, + .read_integer = AfbHalReadInt, + .read_enumerated = AfbHalReadEnumerate, + .write_integer = AfbHalWriteInt, + .write_enumerated = AfbHalWriteEnum, + .read_event = AfbHalEventRead, +}; + +SND_CTL_PLUGIN_DEFINE_FUNC(afbhal) { + + snd_config_iterator_t it, next; + snd_ctl_hal_t *plughandle; + int err; + snd_ctl_cb_t AfbHalInitCB; + const char *libname; + + plughandle = calloc(1, sizeof (snd_ctl_hal_t)); + + snd_config_for_each(it, next, conf) { + snd_config_t *node = snd_config_iterator_entry(it); + const char *id; + + // ignore comment en empty lines + if (snd_config_get_id(node, &id) < 0) continue; + if (strcmp(id, "comment") == 0 || strcmp(id, "type") == 0 || strcmp(id, "hint") == 0) continue; + + // devid should point onto a valid sound card + if (strcmp(id, "devid") == 0) { + const char *devid; + if (snd_config_get_string(node, &devid) < 0) { + SNDERR("Invalid string type for %s", id); + return -EINVAL; + } + plughandle->devid = strdup(devid); + + // open control interface for devid + err = snd_ctl_open(&plughandle->ctlDev, plughandle->devid, 0); + if (err < 0) { + SNDERR("Fail to open control device for devid=%s", plughandle->devid); + return -EINVAL; + } + continue; + } + + if (strcmp(id, "cblib") == 0) { + if (snd_config_get_string(node, &libname) < 0) { + SNDERR("Invalid libname string for %s", id); + return -EINVAL; + } + + plughandle->dlHandle = dlopen(libname, RTLD_NOW); + if (!plughandle->dlHandle) { + SNDERR("Fail to open callback sharelib=%s error=%s", libname, dlerror()); + return -EINVAL; + } + + AfbHalInitCB = dlsym(plughandle->dlHandle, "AfbHalInitCB"); + if (!AfbHalInitCB) { + SNDERR("Fail find 'AfbHalInitCB' symbol into callbacks sharelib=%s", libname); + return -EINVAL; + } + + err = (*AfbHalInitCB)(plughandle, CTLCB_INIT, 0, 0); + if (err) { + SNDERR("Fail AfbHalInitCB err=%d", err); + return -EINVAL; + } + + continue; + } + + if (strcmp(id, "ctl") == 0) { + const char *ctlConf; + snd_config_type_t ctype; + snd_config_iterator_t currentCtl, follow; + snd_config_t *itemConf; + + ctype = snd_config_get_type(node); + if (ctype != SND_CONFIG_TYPE_COMPOUND) { + snd_config_get_string(node, &ctlConf); + SNDERR("Invalid compound type for %s", node); + return -EINVAL; + } + + // loop on each ctl within ctls + + snd_config_for_each(currentCtl, follow, node) { + snd_config_t *ctlconfig = snd_config_iterator_entry(currentCtl); + snd_ctl_elem_info_t *elemInfo; + const char *ctlLabel, *ctlName; + + // ignore empty line + if (snd_config_get_id(ctlconfig, &ctlLabel) < 0) continue; + + // each clt should be a valid config compound + ctype = snd_config_get_type(ctlconfig); + if (ctype != SND_CONFIG_TYPE_COMPOUND) { + snd_config_get_string(node, &ctlConf); + SNDERR("Invalid ctl config for %s", ctlLabel); + return -EINVAL; + } + + err = snd_config_search(ctlconfig, "ctl", &itemConf); + if (!err) { + if (snd_config_get_integer(itemConf, (long*) &plughandle->ctls[plughandle->ctlsCount].ctlNumid) < 0) { + SNDERR("Not Integer: ctl:%s numid should be a valid integer", ctlLabel); + return -EINVAL; + } + + // Make sure than numid is valid on slave snd card + snd_ctl_elem_info_malloc(&elemInfo); + snd_ctl_elem_info_set_numid(elemInfo, (int) plughandle->ctls[plughandle->ctlsCount].ctlNumid); + plughandle->infos[plughandle->ctlsCount] = elemInfo; + + err = snd_ctl_elem_info(plughandle->ctlDev, elemInfo); + if (err) { + SNDERR("Not Found: 'numid=%d' for 'devid=%s'", plughandle->ctls[plughandle->ctlsCount].ctlNumid, plughandle->devid); + return -EINVAL; + } + } + + err = snd_config_search(ctlconfig, "ctlcb", &itemConf); + if (!err) { + const char *funcname; + void *funcaddr; + + if (snd_config_get_string(itemConf, &funcname) < 0) { + SNDERR("Not string: ctl:%s cbname should be a valid string", ctlLabel); + return -EINVAL; + } + + if (funcname[0] != '@') { + SNDERR("Not string: ctl:%s cbname=%s should be prefixed with '@' ", ctlLabel, funcname); + return -EINVAL; + } + + if (!plughandle->dlHandle) { + SNDERR("No CB: ctl:%s cblib:/my/libcallback missing from asoundrc", ctlLabel); + return -EINVAL; + } + + funcaddr = dlsym(plughandle->dlHandle, &funcname[1]); + if (!funcaddr) { + SNDERR("NotFound CB: ctl:%s cbname='%s' no symbol into %s", ctlLabel, &funcname[1], libname); + return -EINVAL; + } + plughandle->cbs[plughandle->ctlsCount] = funcaddr; + } + + err = snd_config_search(ctlconfig, "name", &itemConf); + if (err) { + SNDERR("Not Found: 'name' mandatory in ctl config"); + return -EINVAL; + } + + if (snd_config_get_string(itemConf, &ctlName) < 0) { + SNDERR("Not String: ctl:%s 'name' should be a valie string", ctlLabel); + return -EINVAL; + } + plughandle->ctls[plughandle->ctlsCount].ctlName = strdup(ctlName); + + // move to next ctl if any + plughandle->ctlsCount++; + } // end for each ctl + continue; + } + SNDERR("Unknown field %s", id); + return -EINVAL; + } + + + + // Create ALSA control plugin structure + plughandle->ext.version = SND_CTL_EXT_VERSION; + plughandle->ext.card_idx = 0; /* FIXME */ + strcpy(plughandle->ext.id, "AFB-HAL-CTL"); + strcpy(plughandle->ext.driver, "AFB-HAL"); + strcpy(plughandle->ext.name, "AFB-HAL Control Plugin"); + strcpy(plughandle->ext.mixername, "AFB-HAL Mixer Plugin"); + strcpy(plughandle->ext.longname, "Automotive-Linux Sound Abstraction Control Plugin"); + plughandle->ext.poll_fd = -1; + plughandle->ext.callback = &afbHalCBs; + plughandle->ext.private_data = (void*) plughandle; + + + + err = snd_ctl_ext_create(&plughandle->ext, name, mode); + if (err < 0) { + SNDERR("Fail Register sndctl for devid=%s", plughandle->devid); + goto OnErrorExit; + } + + // Plugin register controls update handlep before exiting + *handlep = plughandle->ext.handle; + return 0; + +OnErrorExit: + free(plughandle); + return -1; +} + +SND_CTL_PLUGIN_SYMBOL(afbhal); -- cgit 1.2.3-korg