275 lines
7.4 KiB
C++
275 lines
7.4 KiB
C++
/* ALSAControl.cpp
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**
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** Copyright 2008-2009 Wind River Systems
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <errno.h>
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#include <stdarg.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <dlfcn.h>
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#define LOG_NDEBUG 0
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#define LOG_TAG "ALSAControl"
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#include <utils/Log.h>
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#include <utils/String8.h>
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#include <cutils/properties.h>
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#include <media/AudioRecord.h>
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#include <hardware_legacy/power.h>
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#include "AudioHardwareALSA.h"
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namespace android
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{
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ALSAControl::ALSAControl(const char *device)
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{
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snd_ctl_open(&mHandle, device, 0);
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}
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ALSAControl::~ALSAControl()
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{
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if (mHandle) snd_ctl_close(mHandle);
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}
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status_t ALSAControl::getmin(const char *name, unsigned int &min)
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{
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if (!mHandle) {
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LOGE("Control not initialized");
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return NO_INIT;
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}
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snd_ctl_elem_id_t *id;
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snd_ctl_elem_info_t *info;
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snd_ctl_elem_id_alloca(&id);
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snd_ctl_elem_info_alloca(&info);
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snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
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snd_ctl_elem_id_set_name(id, name);
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snd_ctl_elem_info_set_id(info, id);
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int ret = snd_ctl_elem_info(mHandle, info);
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if (ret < 0) {
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LOGE("Control '%s' cannot get element info: %d", name, ret);
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return BAD_VALUE;
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}
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min = snd_ctl_elem_info_get_min(info);
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return NO_ERROR;
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}
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status_t ALSAControl::getmax(const char *name, unsigned int &max)
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{
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if (!mHandle) {
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LOGE("Control not initialized");
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return NO_INIT;
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}
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snd_ctl_elem_id_t *id;
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snd_ctl_elem_info_t *info;
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snd_ctl_elem_id_alloca(&id);
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snd_ctl_elem_info_alloca(&info);
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snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
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snd_ctl_elem_id_set_name(id, name);
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snd_ctl_elem_info_set_id(info, id);
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int ret = snd_ctl_elem_info(mHandle, info);
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if (ret < 0) {
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LOGE("Control '%s' cannot get element info: %d", name, ret);
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return BAD_VALUE;
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}
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max = snd_ctl_elem_info_get_max(info);
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return NO_ERROR;
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}
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status_t ALSAControl::get(const char *name, unsigned int &value, int index)
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{
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if (!mHandle) {
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LOGE("Control not initialized");
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return NO_INIT;
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}
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snd_ctl_elem_id_t *id;
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snd_ctl_elem_info_t *info;
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snd_ctl_elem_value_t *control;
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snd_ctl_elem_id_alloca(&id);
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snd_ctl_elem_info_alloca(&info);
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snd_ctl_elem_value_alloca(&control);
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snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
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snd_ctl_elem_id_set_name(id, name);
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snd_ctl_elem_info_set_id(info, id);
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int ret = snd_ctl_elem_info(mHandle, info);
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if (ret < 0) {
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LOGE("Control '%s' cannot get element info: %d", name, ret);
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return BAD_VALUE;
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}
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int count = snd_ctl_elem_info_get_count(info);
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if (index >= count) {
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LOGE("Control '%s' index is out of range (%d >= %d)", name, index, count);
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return BAD_VALUE;
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}
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snd_ctl_elem_info_get_id(info, id);
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snd_ctl_elem_value_set_id(control, id);
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ret = snd_ctl_elem_read(mHandle, control);
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if (ret < 0) {
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LOGE("Control '%s' cannot read element value: %d", name, ret);
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return BAD_VALUE;
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}
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snd_ctl_elem_type_t type = snd_ctl_elem_info_get_type(info);
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switch (type) {
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case SND_CTL_ELEM_TYPE_BOOLEAN:
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value = snd_ctl_elem_value_get_boolean(control, index);
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break;
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case SND_CTL_ELEM_TYPE_INTEGER:
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value = snd_ctl_elem_value_get_integer(control, index);
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break;
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case SND_CTL_ELEM_TYPE_INTEGER64:
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value = snd_ctl_elem_value_get_integer64(control, index);
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break;
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case SND_CTL_ELEM_TYPE_ENUMERATED:
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value = snd_ctl_elem_value_get_enumerated(control, index);
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break;
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case SND_CTL_ELEM_TYPE_BYTES:
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value = snd_ctl_elem_value_get_byte(control, index);
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break;
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default:
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return BAD_VALUE;
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}
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return NO_ERROR;
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}
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status_t ALSAControl::set(const char *name, unsigned int value, int index)
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{
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if (!mHandle) {
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LOGE("Control not initialized");
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return NO_INIT;
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}
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snd_ctl_elem_id_t *id;
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snd_ctl_elem_info_t *info;
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snd_ctl_elem_id_alloca(&id);
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snd_ctl_elem_info_alloca(&info);
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snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
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snd_ctl_elem_id_set_name(id, name);
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snd_ctl_elem_info_set_id(info, id);
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int ret = snd_ctl_elem_info(mHandle, info);
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if (ret < 0) {
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LOGE("Control '%s' cannot get element info: %d", name, ret);
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return BAD_VALUE;
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}
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int count = snd_ctl_elem_info_get_count(info);
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if (index >= count) {
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LOGE("Control '%s' index is out of range (%d >= %d)", name, index, count);
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return BAD_VALUE;
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}
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if (index == -1)
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index = 0; // Range over all of them
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else
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count = index + 1; // Just do the one specified
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snd_ctl_elem_type_t type = snd_ctl_elem_info_get_type(info);
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snd_ctl_elem_value_t *control;
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snd_ctl_elem_value_alloca(&control);
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snd_ctl_elem_info_get_id(info, id);
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snd_ctl_elem_value_set_id(control, id);
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for (int i = index; i < count; i++)
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switch (type) {
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case SND_CTL_ELEM_TYPE_BOOLEAN:
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snd_ctl_elem_value_set_boolean(control, i, value);
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break;
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case SND_CTL_ELEM_TYPE_INTEGER:
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snd_ctl_elem_value_set_integer(control, i, value);
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break;
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case SND_CTL_ELEM_TYPE_INTEGER64:
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snd_ctl_elem_value_set_integer64(control, i, value);
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break;
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case SND_CTL_ELEM_TYPE_ENUMERATED:
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snd_ctl_elem_value_set_enumerated(control, i, value);
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break;
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case SND_CTL_ELEM_TYPE_BYTES:
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snd_ctl_elem_value_set_byte(control, i, value);
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break;
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default:
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break;
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}
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ret = snd_ctl_elem_write(mHandle, control);
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return (ret < 0) ? BAD_VALUE : NO_ERROR;
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}
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status_t ALSAControl::set(const char *name, const char *value)
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{
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if (!mHandle) {
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LOGE("Control not initialized");
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return NO_INIT;
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}
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snd_ctl_elem_id_t *id;
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snd_ctl_elem_info_t *info;
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snd_ctl_elem_id_alloca(&id);
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snd_ctl_elem_info_alloca(&info);
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snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
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snd_ctl_elem_id_set_name(id, name);
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snd_ctl_elem_info_set_id(info, id);
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int ret = snd_ctl_elem_info(mHandle, info);
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if (ret < 0) {
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LOGE("Control '%s' cannot get element info: %d", name, ret);
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return BAD_VALUE;
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}
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int items = snd_ctl_elem_info_get_items(info);
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for (int i = 0; i < items; i++) {
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snd_ctl_elem_info_set_item(info, i);
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ret = snd_ctl_elem_info(mHandle, info);
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if (ret < 0) continue;
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if (strcmp(value, snd_ctl_elem_info_get_item_name(info)) == 0)
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return set(name, i, -1);
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}
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LOGE("Control '%s' has no enumerated value of '%s'", name, value);
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return BAD_VALUE;
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}
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}; // namespace android
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