759 lines
22 KiB
C
759 lines
22 KiB
C
/*
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** Copyright 2010, The Android Open-Source Project
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** Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <ctype.h>
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#include <math.h>
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#include <linux/ioctl.h>
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#define __force
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#define __bitwise
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#define __user
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#include <sound/asound.h>
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#include <sound/tlv.h>
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#include "alsa_audio.h"
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#define LOG_TAG "alsa_mixer"
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#define LOG_NDEBUG 1
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#ifdef ANDROID
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/* definitions for Android logging */
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#include <utils/Log.h>
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#else /* ANDROID */
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#include <math.h>
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#define ALOGI(...) fprintf(stdout, __VA_ARGS__)
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#define ALOGE(...) fprintf(stderr, __VA_ARGS__)
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#define ALOGV(...) fprintf(stderr, __VA_ARGS__)
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#endif /* ANDROID */
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#define check_range(val, min, max) \
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(((val < min) ? (min) : (val > max) ? (max) : (val)))
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/* .5 for rounding before casting to non-decmal value */
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/* Should not be used if you need decmal values */
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/* or are expecting negitive indexes */
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#define percent_to_index(val, min, max) \
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((val) * ((max) - (min)) * 0.01 + (min) + .5)
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#define DEFAULT_TLV_SIZE 4096
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#define SPDIF_CHANNEL_STATUS_SIZE 24
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enum ctl_type {
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CTL_GLOBAL_VOLUME,
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CTL_PLAYBACK_VOLUME,
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CTL_CAPTURE_VOLUME,
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};
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static const struct suf {
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const char *suffix;
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snd_ctl_elem_iface_t type;
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} suffixes[] = {
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{" Playback Volume", CTL_PLAYBACK_VOLUME},
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{" Capture Volume", CTL_CAPTURE_VOLUME},
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{" Volume", CTL_GLOBAL_VOLUME},
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{NULL, 0}
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};
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static int is_volume(const char *name, enum ctl_type *type)
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{
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const struct suf *p;
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size_t nlen = strlen(name);
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p = suffixes;
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while (p->suffix) {
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size_t slen = strnlen(p->suffix, 44);
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size_t l;
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if (nlen > slen) {
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l = nlen - slen;
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if (strncmp(name + l, p->suffix, slen) == 0 &&
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(l < 1 || name[l-1] != '-')) { /* 3D Control - Switch */
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*type = p->type;
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return l;
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}
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}
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p++;
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}
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return 0;
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}
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static const char *elem_iface_name(snd_ctl_elem_iface_t n)
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{
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switch (n) {
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case SNDRV_CTL_ELEM_IFACE_CARD: return "CARD";
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case SNDRV_CTL_ELEM_IFACE_HWDEP: return "HWDEP";
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case SNDRV_CTL_ELEM_IFACE_MIXER: return "MIXER";
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case SNDRV_CTL_ELEM_IFACE_PCM: return "PCM";
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case SNDRV_CTL_ELEM_IFACE_RAWMIDI: return "MIDI";
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case SNDRV_CTL_ELEM_IFACE_TIMER: return "TIMER";
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case SNDRV_CTL_ELEM_IFACE_SEQUENCER: return "SEQ";
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default: return "???";
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}
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}
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static const char *elem_type_name(snd_ctl_elem_type_t n)
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{
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switch (n) {
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case SNDRV_CTL_ELEM_TYPE_NONE: return "NONE";
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case SNDRV_CTL_ELEM_TYPE_BOOLEAN: return "BOOL";
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case SNDRV_CTL_ELEM_TYPE_INTEGER: return "INT32";
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case SNDRV_CTL_ELEM_TYPE_ENUMERATED: return "ENUM";
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case SNDRV_CTL_ELEM_TYPE_BYTES: return "BYTES";
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case SNDRV_CTL_ELEM_TYPE_IEC958: return "IEC958";
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case SNDRV_CTL_ELEM_TYPE_INTEGER64: return "INT64";
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default: return "???";
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}
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}
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void mixer_close(struct mixer *mixer)
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{
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unsigned n,m;
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if (mixer->fd >= 0)
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close(mixer->fd);
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if (mixer->ctl) {
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for (n = 0; n < mixer->count; n++) {
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if (mixer->ctl[n].ename) {
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unsigned max = mixer->ctl[n].info->value.enumerated.items;
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for (m = 0; m < max; m++)
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free(mixer->ctl[n].ename[m]);
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free(mixer->ctl[n].ename);
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}
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}
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free(mixer->ctl);
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}
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if (mixer->info)
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free(mixer->info);
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free(mixer);
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}
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struct mixer *mixer_open(const char *device)
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{
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struct snd_ctl_elem_list elist;
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struct snd_ctl_elem_info tmp;
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struct snd_ctl_elem_id *eid = NULL;
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struct mixer *mixer = NULL;
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unsigned n, m;
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int fd;
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fd = open(device, O_RDWR);
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if (fd < 0) {
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ALOGE("Control open failed\n");
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return 0;
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}
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memset(&elist, 0, sizeof(elist));
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if (ioctl(fd, SNDRV_CTL_IOCTL_ELEM_LIST, &elist) < 0) {
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ALOGE("SNDRV_CTL_IOCTL_ELEM_LIST failed\n");
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goto fail;
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}
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mixer = calloc(1, sizeof(*mixer));
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if (!mixer)
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goto fail;
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mixer->ctl = calloc(elist.count, sizeof(struct mixer_ctl));
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mixer->info = calloc(elist.count, sizeof(struct snd_ctl_elem_info));
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if (!mixer->ctl || !mixer->info)
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goto fail;
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eid = calloc(elist.count, sizeof(struct snd_ctl_elem_id));
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if (!eid)
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goto fail;
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mixer->count = elist.count;
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mixer->fd = fd;
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elist.space = mixer->count;
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elist.pids = eid;
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if (ioctl(fd, SNDRV_CTL_IOCTL_ELEM_LIST, &elist) < 0)
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goto fail;
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for (n = 0; n < mixer->count; n++) {
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struct snd_ctl_elem_info *ei = mixer->info + n;
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ei->id.numid = eid[n].numid;
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if (ioctl(fd, SNDRV_CTL_IOCTL_ELEM_INFO, ei) < 0)
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goto fail;
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mixer->ctl[n].info = ei;
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mixer->ctl[n].mixer = mixer;
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if (ei->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) {
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char **enames = calloc(ei->value.enumerated.items, sizeof(char*));
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if (!enames)
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goto fail;
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mixer->ctl[n].ename = enames;
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for (m = 0; m < ei->value.enumerated.items; m++) {
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memset(&tmp, 0, sizeof(tmp));
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tmp.id.numid = ei->id.numid;
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tmp.value.enumerated.item = m;
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if (ioctl(fd, SNDRV_CTL_IOCTL_ELEM_INFO, &tmp) < 0)
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goto fail;
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enames[m] = strdup(tmp.value.enumerated.name);
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if (!enames[m])
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goto fail;
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}
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}
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}
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free(eid);
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return mixer;
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fail:
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if (eid)
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free(eid);
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if (mixer)
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mixer_close(mixer);
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else if (fd >= 0)
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close(fd);
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return 0;
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}
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void mixer_dump(struct mixer *mixer)
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{
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unsigned n, m;
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ALOGV(" id iface dev sub idx num perms type isvolume name\n");
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for (n = 0; n < mixer->count; n++) {
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enum ctl_type type;
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struct snd_ctl_elem_info *ei = mixer->info + n;
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ALOGV("%4d %5s %3d %3d %3d %3d %c%c%c%c%c%c%c%c%c %-6s %8d %s",
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ei->id.numid, elem_iface_name(ei->id.iface),
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ei->id.device, ei->id.subdevice, ei->id.index,
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ei->count,
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(ei->access & SNDRV_CTL_ELEM_ACCESS_READ) ? 'r' : ' ',
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(ei->access & SNDRV_CTL_ELEM_ACCESS_WRITE) ? 'w' : ' ',
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(ei->access & SNDRV_CTL_ELEM_ACCESS_VOLATILE) ? 'V' : ' ',
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(ei->access & SNDRV_CTL_ELEM_ACCESS_TIMESTAMP) ? 'T' : ' ',
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(ei->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) ? 'R' : ' ',
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(ei->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) ? 'W' : ' ',
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(ei->access & SNDRV_CTL_ELEM_ACCESS_TLV_COMMAND) ? 'C' : ' ',
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(ei->access & SNDRV_CTL_ELEM_ACCESS_INACTIVE) ? 'I' : ' ',
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(ei->access & SNDRV_CTL_ELEM_ACCESS_LOCK) ? 'L' : ' ',
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elem_type_name(ei->type),
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(is_volume(ei->id.name, &type)) ? 1 : 0,
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ei->id.name);
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switch (ei->type) {
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case SNDRV_CTL_ELEM_TYPE_INTEGER:
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ALOGV(ei->value.integer.step ?
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" { %ld-%ld, %ld }\n" : " { %ld-%ld }",
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ei->value.integer.min,
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ei->value.integer.max,
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ei->value.integer.step);
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break;
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case SNDRV_CTL_ELEM_TYPE_INTEGER64:
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ALOGV(ei->value.integer64.step ?
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" { %lld-%lld, %lld }\n" : " { %lld-%lld }",
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ei->value.integer64.min,
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ei->value.integer64.max,
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ei->value.integer64.step);
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break;
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case SNDRV_CTL_ELEM_TYPE_ENUMERATED: {
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unsigned m;
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ALOGV(" { %s=0", mixer->ctl[n].ename[0]);
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for (m = 1; m < ei->value.enumerated.items; m++)
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ALOGV(", %s=%d", mixer->ctl[n].ename[m],m);
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ALOGV(" }");
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break;
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}
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}
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ALOGV("\n");
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}
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}
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struct mixer_ctl *mixer_get_control(struct mixer *mixer,
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const char *name, unsigned index)
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{
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unsigned n;
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for (n = 0; n < mixer->count; n++) {
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if (mixer->info[n].id.index == index) {
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if (!strncmp(name, (char*) mixer->info[n].id.name,
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sizeof(mixer->info[n].id.name))) {
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return mixer->ctl + n;
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}
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}
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}
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return 0;
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}
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struct mixer_ctl *mixer_get_nth_control(struct mixer *mixer, unsigned n)
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{
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if (n < mixer->count)
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return mixer->ctl + n;
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return 0;
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}
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static void print_dB(long dB)
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{
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ALOGV("%li.%02lidB", dB / 100, (dB < 0 ? -dB : dB) % 100);
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}
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int mixer_ctl_read_tlv(struct mixer_ctl *ctl,
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unsigned int *tlv,
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long *min, long *max, unsigned int *tlv_type)
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{
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unsigned int tlv_size = DEFAULT_TLV_SIZE;
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unsigned int type;
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unsigned int size;
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if(!!(ctl->info->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ)) {
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struct snd_ctl_tlv *xtlv;
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tlv[0] = -1;
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tlv[1] = 0;
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xtlv = calloc(1, sizeof(struct snd_ctl_tlv) + tlv_size);
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if (xtlv == NULL)
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return -ENOMEM;
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xtlv->numid = ctl->info->id.numid;
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xtlv->length = tlv_size;
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memcpy(xtlv->tlv, tlv, tlv_size);
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if (ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_TLV_READ, xtlv) < 0) {
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fprintf( stderr, "SNDRV_CTL_IOCTL_TLV_READ failed\n");
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free(xtlv);
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return -errno;
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}
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if (xtlv->tlv[1] + 2 * sizeof(unsigned int) > tlv_size) {
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free(xtlv);
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return -EFAULT;
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}
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memcpy(tlv, xtlv->tlv, xtlv->tlv[1] + 2 * sizeof(unsigned int));
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free(xtlv);
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type = tlv[0];
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*tlv_type = type;
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size = tlv[1];
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switch (type) {
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case SNDRV_CTL_TLVT_DB_SCALE: {
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int idx = 2;
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int step;
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ALOGV("dBscale-");
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if (size != 2 * sizeof(unsigned int)) {
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while (size > 0) {
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ALOGV("0x%08x,", tlv[idx++]);
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size -= sizeof(unsigned int);
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}
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} else {
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ALOGV(" min=");
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print_dB((int)tlv[2]);
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*min = (long)tlv[2];
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ALOGV(" step=");
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step = (tlv[3] & 0xffff);
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print_dB(tlv[3] & 0xffff);
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ALOGV(" max=");
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*max = (ctl->info->value.integer.max);
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print_dB((long)ctl->info->value.integer.max);
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ALOGV(" mute=%i\n", (tlv[3] >> 16) & 1);
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}
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break;
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}
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case SNDRV_CTL_TLVT_DB_LINEAR: {
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int idx = 2;
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ALOGV("dBLiner-");
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if (size != 2 * sizeof(unsigned int)) {
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while (size > 0) {
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ALOGV("0x%08x,", tlv[idx++]);
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size -= sizeof(unsigned int);
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}
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} else {
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ALOGV(" min=");
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*min = tlv[2];
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print_dB(tlv[2]);
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ALOGV(" max=");
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*max = tlv[3];
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print_dB(tlv[3]);
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}
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break;
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}
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default:
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break;
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}
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return 0;
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}
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return -EINVAL;
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}
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void mixer_ctl_get(struct mixer_ctl *ctl, unsigned *value)
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{
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struct snd_ctl_elem_value ev;
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unsigned int n;
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unsigned int *tlv = NULL;
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enum ctl_type type;
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unsigned int *tlv_type;
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long min, max;
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if (is_volume(ctl->info->id.name, &type)) {
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ALOGV("capability: volume\n");
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tlv = calloc(1, DEFAULT_TLV_SIZE);
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if (tlv == NULL) {
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ALOGE("failed to allocate memory\n");
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} else {
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mixer_ctl_read_tlv(ctl, tlv, &min, &max, &tlv_type);
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free(tlv);
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}
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}
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memset(&ev, 0, sizeof(ev));
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ev.id.numid = ctl->info->id.numid;
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if (ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_READ, &ev))
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return;
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ALOGV("%s:", ctl->info->id.name);
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switch (ctl->info->type) {
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case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
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for (n = 0; n < ctl->info->count; n++)
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ALOGV(" %s", ev.value.integer.value[n] ? "on" : "off");
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*value = ev.value.integer.value[0];
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break;
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case SNDRV_CTL_ELEM_TYPE_INTEGER: {
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for (n = 0; n < ctl->info->count; n++)
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ALOGV(" %ld", ev.value.integer.value[n]);
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*value = ev.value.integer.value[0];
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break;
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}
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case SNDRV_CTL_ELEM_TYPE_INTEGER64:
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for (n = 0; n < ctl->info->count; n++)
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ALOGV(" %lld", ev.value.integer64.value[n]);
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*value = ev.value.integer64.value[0];
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break;
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case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
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for (n = 0; n < ctl->info->count; n++) {
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unsigned v = ev.value.enumerated.item[n];
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ALOGV(" %d (%s)", v,
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(v < ctl->info->value.enumerated.items) ? ctl->ename[v] : "???");
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*value = ev.value.enumerated.item[0];
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}
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break;
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default:
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ALOGV(" ???");
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}
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ALOGV("\n");
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}
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static long scale_int(struct snd_ctl_elem_info *ei, unsigned _percent)
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{
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long percent;
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if (_percent > 100)
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percent = 100;
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else
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percent = (long) _percent;
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return (long)percent_to_index(percent, ei->value.integer.min, ei->value.integer.max);
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}
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static long long scale_int64(struct snd_ctl_elem_info *ei, unsigned _percent)
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{
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long long percent;
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if (_percent > 100)
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percent = 100;
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else
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percent = (long) _percent;
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return (long long)percent_to_index(percent, ei->value.integer.min, ei->value.integer.max);
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}
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/*
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* Add support for controls taking more than one parameter as input value
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* This is useful for volume controls which take two parameters as input value.
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*/
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int mixer_ctl_mulvalues(struct mixer_ctl *ctl, int count, char ** argv)
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{
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struct snd_ctl_elem_value ev;
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unsigned n;
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if (!ctl) {
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ALOGV("can't find control\n");
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return -1;
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}
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if (count < ctl->info->count || count > ctl->info->count)
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return -EINVAL;
|
|
|
|
memset(&ev, 0, sizeof(ev));
|
|
ev.id.numid = ctl->info->id.numid;
|
|
switch (ctl->info->type) {
|
|
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
|
|
for (n = 0; n < ctl->info->count; n++)
|
|
ev.value.integer.value[n] = !!atoi(argv[n]);
|
|
break;
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER: {
|
|
for (n = 0; n < ctl->info->count; n++) {
|
|
fprintf( stderr, "Value: %d idx:%d\n", atoi(argv[n]), n);
|
|
ev.value.integer.value[n] = atoi(argv[n]);
|
|
}
|
|
break;
|
|
}
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER64: {
|
|
for (n = 0; n < ctl->info->count; n++) {
|
|
long long value_ll = scale_int64(ctl->info, atoi(argv[n]));
|
|
fprintf( stderr, "ll_value = %lld\n", value_ll);
|
|
ev.value.integer64.value[n] = value_ll;
|
|
}
|
|
break;
|
|
}
|
|
case SNDRV_CTL_ELEM_TYPE_ENUMERATED: {
|
|
for (n = 0; n < ctl->info->count; n++) {
|
|
fprintf( stderr, "Value: %d idx:%d\n", atoi(argv[n]), n);
|
|
ev.value.enumerated.item[n] = (unsigned int)atoi(argv[n]);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
errno = EINVAL;
|
|
return errno;
|
|
}
|
|
|
|
return ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_WRITE, &ev);
|
|
}
|
|
|
|
int mixer_ctl_set(struct mixer_ctl *ctl, unsigned percent)
|
|
{
|
|
struct snd_ctl_elem_value ev;
|
|
unsigned n;
|
|
long min, max;
|
|
unsigned int *tlv = NULL;
|
|
enum ctl_type type;
|
|
int volume = 0;
|
|
unsigned int tlv_type;
|
|
|
|
if (!ctl) {
|
|
ALOGV("can't find control\n");
|
|
return -1;
|
|
}
|
|
|
|
if (is_volume(ctl->info->id.name, &type)) {
|
|
ALOGV("capability: volume\n");
|
|
tlv = calloc(1, DEFAULT_TLV_SIZE);
|
|
if (tlv == NULL) {
|
|
ALOGE("failed to allocate memory\n");
|
|
} else if (!mixer_ctl_read_tlv(ctl, tlv, &min, &max, &tlv_type)) {
|
|
switch(tlv_type) {
|
|
case SNDRV_CTL_TLVT_DB_LINEAR:
|
|
ALOGV("tlv db linear: b4 %d\n", percent);
|
|
|
|
if (min < 0) {
|
|
max = max - min;
|
|
min = 0;
|
|
}
|
|
percent = check_range(percent, min, max);
|
|
ALOGV("tlv db linear: %d %d %d\n", percent, min, max);
|
|
volume = 1;
|
|
break;
|
|
default:
|
|
percent = (long)percent_to_index(percent, min, max);
|
|
percent = check_range(percent, min, max);
|
|
volume = 1;
|
|
break;
|
|
}
|
|
} else
|
|
ALOGV("mixer_ctl_read_tlv failed\n");
|
|
free(tlv);
|
|
}
|
|
memset(&ev, 0, sizeof(ev));
|
|
ev.id.numid = ctl->info->id.numid;
|
|
switch (ctl->info->type) {
|
|
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
|
|
for (n = 0; n < ctl->info->count; n++)
|
|
ev.value.integer.value[n] = !!percent;
|
|
break;
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER: {
|
|
int value;
|
|
if (!volume)
|
|
value = scale_int(ctl->info, percent);
|
|
else
|
|
value = (int) percent;
|
|
for (n = 0; n < ctl->info->count; n++)
|
|
ev.value.integer.value[n] = value;
|
|
break;
|
|
}
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER64: {
|
|
long long value;
|
|
if (!volume)
|
|
value = scale_int64(ctl->info, percent);
|
|
else
|
|
value = (long long)percent;
|
|
for (n = 0; n < ctl->info->count; n++)
|
|
ev.value.integer64.value[n] = value;
|
|
break;
|
|
}
|
|
case SNDRV_CTL_ELEM_TYPE_IEC958: {
|
|
struct snd_aes_iec958 *iec958;
|
|
iec958 = (struct snd_aes_iec958 *)percent;
|
|
memcpy(ev.value.iec958.status,iec958->status,SPDIF_CHANNEL_STATUS_SIZE);
|
|
break;
|
|
}
|
|
default:
|
|
errno = EINVAL;
|
|
return errno;
|
|
}
|
|
|
|
return ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_WRITE, &ev);
|
|
}
|
|
|
|
/* the api parses the mixer control input to extract
|
|
* the value of volume in any one of the following format
|
|
* <volume><%>
|
|
* <volume><dB>
|
|
* All remaining formats are currently ignored.
|
|
*/
|
|
|
|
static int set_volume_simple(struct mixer_ctl *ctl,
|
|
char **ptr, long pmin, long pmax, int count)
|
|
{
|
|
long val, orig;
|
|
char *p = *ptr, *s;
|
|
struct snd_ctl_elem_value ev;
|
|
unsigned n;
|
|
|
|
if (*p == ':')
|
|
p++;
|
|
if (*p == '\0' || (!isdigit(*p) && *p != '-'))
|
|
goto skip;
|
|
|
|
s = p;
|
|
val = strtol(s, &p, 10);
|
|
if (*p == '.') {
|
|
p++;
|
|
strtol(p, &p, 10);
|
|
}
|
|
if (*p == '%') {
|
|
val = (long)percent_to_index(strtod(s, NULL), pmin, pmax);
|
|
p++;
|
|
} else if (p[0] == 'd' && p[1] == 'B') {
|
|
val = (long)(strtod(s, NULL) * 100.0);
|
|
p += 2;
|
|
} else {
|
|
if (pmin < 0) {
|
|
pmax = pmax - pmin;
|
|
pmin = 0;
|
|
}
|
|
}
|
|
val = check_range(val, pmin, pmax);
|
|
ALOGV("val = %x", val);
|
|
|
|
if (!ctl) {
|
|
ALOGV("can't find control\n");
|
|
return -EPERM;
|
|
}
|
|
if (count < ctl->info->count || count > ctl->info->count)
|
|
return -EINVAL;
|
|
|
|
ALOGV("Value = ");
|
|
|
|
memset(&ev, 0, sizeof(ev));
|
|
ev.id.numid = ctl->info->id.numid;
|
|
switch (ctl->info->type) {
|
|
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
|
|
for (n = 0; n < ctl->info->count; n++)
|
|
ev.value.integer.value[n] = !!val;
|
|
print_dB(val);
|
|
break;
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER: {
|
|
for (n = 0; n < ctl->info->count; n++)
|
|
ev.value.integer.value[n] = val;
|
|
print_dB(val);
|
|
break;
|
|
}
|
|
case SNDRV_CTL_ELEM_TYPE_INTEGER64: {
|
|
for (n = 0; n < ctl->info->count; n++) {
|
|
long long value_ll = scale_int64(ctl->info, val);
|
|
print_dB(value_ll);
|
|
ev.value.integer64.value[n] = value_ll;
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
errno = EINVAL;
|
|
return errno;
|
|
}
|
|
|
|
ALOGV("\n");
|
|
return ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_WRITE, &ev);
|
|
|
|
skip:
|
|
if (*p == ',')
|
|
p++;
|
|
*ptr = p;
|
|
return 0;
|
|
}
|
|
|
|
int mixer_ctl_set_value(struct mixer_ctl *ctl, int count, char ** argv)
|
|
{
|
|
unsigned int size;
|
|
unsigned int *tlv = NULL;
|
|
long min, max;
|
|
enum ctl_type type;
|
|
unsigned int tlv_type;
|
|
|
|
if (is_volume(ctl->info->id.name, &type)) {
|
|
ALOGV("capability: volume\n");
|
|
tlv = calloc(1, DEFAULT_TLV_SIZE);
|
|
if (tlv == NULL) {
|
|
ALOGE("failed to allocate memory\n");
|
|
} else if (!mixer_ctl_read_tlv(ctl, tlv, &min, &max, &tlv_type)) {
|
|
ALOGV("min = %x max = %x", min, max);
|
|
if (set_volume_simple(ctl, argv, min, max, count))
|
|
mixer_ctl_mulvalues(ctl, count, argv);
|
|
} else
|
|
ALOGV("mixer_ctl_read_tlv failed\n");
|
|
free(tlv);
|
|
} else {
|
|
mixer_ctl_mulvalues(ctl, count, argv);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
int mixer_ctl_select(struct mixer_ctl *ctl, const char *value)
|
|
{
|
|
unsigned n, max;
|
|
struct snd_ctl_elem_value ev;
|
|
unsigned int input_str_len, str_len;
|
|
|
|
if (ctl->info->type != SNDRV_CTL_ELEM_TYPE_ENUMERATED) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
input_str_len = strnlen(value,64);
|
|
|
|
max = ctl->info->value.enumerated.items;
|
|
for (n = 0; n < max; n++) {
|
|
|
|
str_len = strnlen(ctl->ename[n], 64);
|
|
if (str_len < input_str_len)
|
|
str_len = input_str_len;
|
|
|
|
if (!strncmp(value, ctl->ename[n], str_len)) {
|
|
memset(&ev, 0, sizeof(ev));
|
|
ev.value.enumerated.item[0] = n;
|
|
ev.id.numid = ctl->info->id.numid;
|
|
if (ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_WRITE, &ev) < 0)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
errno = EINVAL;
|
|
return errno;
|
|
}
|