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434 lines
13 KiB
434 lines
13 KiB
/* ALSAMixer.cpp
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**
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** Copyright 2008-2010 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_TAG "AudioHardwareALSA"
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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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#define SND_MIXER_VOL_RANGE_MIN (0)
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#define SND_MIXER_VOL_RANGE_MAX (100)
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#define ALSA_NAME_MAX 128
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#define ALSA_STRCAT(x,y) \
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if (strlen(x) + strlen(y) < ALSA_NAME_MAX) \
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strcat(x, y);
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namespace android
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{
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// ----------------------------------------------------------------------------
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struct mixer_info_t;
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struct alsa_properties_t
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{
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const AudioSystem::audio_devices device;
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const char *propName;
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const char *propDefault;
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mixer_info_t *mInfo;
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};
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#define ALSA_PROP(dev, name, out, in) \
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{\
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{dev, "alsa.mixer.playback." name, out, NULL},\
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{dev, "alsa.mixer.capture." name, in, NULL}\
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}
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static alsa_properties_t
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mixerMasterProp[SND_PCM_STREAM_LAST+1] =
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ALSA_PROP(AudioSystem::DEVICE_OUT_ALL, "master", "PCM", "Capture");
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static alsa_properties_t
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mixerProp[][SND_PCM_STREAM_LAST+1] = {
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ALSA_PROP(AudioSystem::DEVICE_OUT_EARPIECE, "earpiece", "Earpiece", "Capture"),
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ALSA_PROP(AudioSystem::DEVICE_OUT_SPEAKER, "speaker", "Speaker", ""),
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ALSA_PROP(AudioSystem::DEVICE_OUT_WIRED_HEADSET, "headset", "Headphone", "Capture"),
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ALSA_PROP(AudioSystem::DEVICE_OUT_BLUETOOTH_SCO, "bluetooth.sco", "Bluetooth", "Bluetooth Capture"),
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ALSA_PROP(AudioSystem::DEVICE_OUT_BLUETOOTH_A2DP, "bluetooth.a2dp", "Bluetooth A2DP", "Bluetooth A2DP Capture"),
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ALSA_PROP(static_cast<AudioSystem::audio_devices>(0), "", NULL, NULL)
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};
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struct mixer_info_t
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{
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mixer_info_t() :
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elem(0),
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min(SND_MIXER_VOL_RANGE_MIN),
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max(SND_MIXER_VOL_RANGE_MAX),
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mute(false)
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{
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}
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snd_mixer_elem_t *elem;
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long min;
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long max;
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long volume;
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bool mute;
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char name[ALSA_NAME_MAX];
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};
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static int initMixer (snd_mixer_t **mixer, const char *name)
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{
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int err;
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if ((err = snd_mixer_open(mixer, 0)) < 0) {
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ALOGE("Unable to open mixer: %s", snd_strerror(err));
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return err;
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}
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if ((err = snd_mixer_attach(*mixer, name)) < 0) {
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ALOGW("Unable to attach mixer to device %s: %s",
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name, snd_strerror(err));
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if ((err = snd_mixer_attach(*mixer, "hw:00")) < 0) {
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ALOGE("Unable to attach mixer to device default: %s",
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snd_strerror(err));
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snd_mixer_close (*mixer);
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*mixer = NULL;
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return err;
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}
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}
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if ((err = snd_mixer_selem_register(*mixer, NULL, NULL)) < 0) {
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ALOGE("Unable to register mixer elements: %s", snd_strerror(err));
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snd_mixer_close (*mixer);
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*mixer = NULL;
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return err;
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}
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// Get the mixer controls from the kernel
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if ((err = snd_mixer_load(*mixer)) < 0) {
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ALOGE("Unable to load mixer elements: %s", snd_strerror(err));
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snd_mixer_close (*mixer);
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*mixer = NULL;
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return err;
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}
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return 0;
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}
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typedef int (*hasVolume_t)(snd_mixer_elem_t*);
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static const hasVolume_t hasVolume[] = {
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snd_mixer_selem_has_playback_volume,
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snd_mixer_selem_has_capture_volume
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};
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typedef int (*getVolumeRange_t)(snd_mixer_elem_t*, long int*, long int*);
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static const getVolumeRange_t getVolumeRange[] = {
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snd_mixer_selem_get_playback_volume_range,
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snd_mixer_selem_get_capture_volume_range
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};
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typedef int (*setVolume_t)(snd_mixer_elem_t*, long int);
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static const setVolume_t setVol[] = {
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snd_mixer_selem_set_playback_volume_all,
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snd_mixer_selem_set_capture_volume_all
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};
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ALSAMixer::ALSAMixer()
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{
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int err;
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initMixer (&mMixer[SND_PCM_STREAM_PLAYBACK], "AndroidOut");
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initMixer (&mMixer[SND_PCM_STREAM_CAPTURE], "AndroidIn");
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snd_mixer_selem_id_t *sid;
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snd_mixer_selem_id_alloca(&sid);
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for (int i = 0; i <= SND_PCM_STREAM_LAST; i++) {
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if (!mMixer[i]) continue;
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mixer_info_t *info = mixerMasterProp[i].mInfo = new mixer_info_t;
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property_get (mixerMasterProp[i].propName,
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info->name,
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mixerMasterProp[i].propDefault);
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for (snd_mixer_elem_t *elem = snd_mixer_first_elem(mMixer[i]);
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elem;
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elem = snd_mixer_elem_next(elem)) {
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if (!snd_mixer_selem_is_active(elem))
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continue;
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snd_mixer_selem_get_id(elem, sid);
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// Find PCM playback volume control element.
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const char *elementName = snd_mixer_selem_id_get_name(sid);
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if (info->elem == NULL &&
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strcmp(elementName, info->name) == 0 &&
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hasVolume[i] (elem)) {
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info->elem = elem;
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getVolumeRange[i] (elem, &info->min, &info->max);
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info->volume = info->max;
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setVol[i] (elem, info->volume);
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if (i == SND_PCM_STREAM_PLAYBACK &&
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snd_mixer_selem_has_playback_switch (elem))
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snd_mixer_selem_set_playback_switch_all (elem, 1);
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break;
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}
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}
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ALOGV("Mixer: master '%s' %s.", info->name, info->elem ? "found" : "not found");
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for (int j = 0; mixerProp[j][i].device; j++) {
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mixer_info_t *info = mixerProp[j][i].mInfo = new mixer_info_t;
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property_get (mixerProp[j][i].propName,
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info->name,
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mixerProp[j][i].propDefault);
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for (snd_mixer_elem_t *elem = snd_mixer_first_elem(mMixer[i]);
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elem;
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elem = snd_mixer_elem_next(elem)) {
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if (!snd_mixer_selem_is_active(elem))
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continue;
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snd_mixer_selem_get_id(elem, sid);
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// Find PCM playback volume control element.
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const char *elementName = snd_mixer_selem_id_get_name(sid);
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if (info->elem == NULL &&
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strcmp(elementName, info->name) == 0 &&
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hasVolume[i] (elem)) {
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info->elem = elem;
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getVolumeRange[i] (elem, &info->min, &info->max);
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info->volume = info->max;
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setVol[i] (elem, info->volume);
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if (i == SND_PCM_STREAM_PLAYBACK &&
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snd_mixer_selem_has_playback_switch (elem))
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snd_mixer_selem_set_playback_switch_all (elem, 1);
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break;
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}
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}
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ALOGV("Mixer: route '%s' %s.", info->name, info->elem ? "found" : "not found");
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}
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}
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ALOGV("mixer initialized.");
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}
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ALSAMixer::~ALSAMixer()
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{
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for (int i = 0; i <= SND_PCM_STREAM_LAST; i++) {
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if (mMixer[i]) snd_mixer_close (mMixer[i]);
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if (mixerMasterProp[i].mInfo) {
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delete mixerMasterProp[i].mInfo;
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mixerMasterProp[i].mInfo = NULL;
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}
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for (int j = 0; mixerProp[j][i].device; j++) {
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if (mixerProp[j][i].mInfo) {
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delete mixerProp[j][i].mInfo;
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mixerProp[j][i].mInfo = NULL;
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}
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}
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}
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ALOGV("mixer destroyed.");
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}
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status_t ALSAMixer::setMasterVolume(float volume)
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{
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mixer_info_t *info = mixerMasterProp[SND_PCM_STREAM_PLAYBACK].mInfo;
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if (!info || !info->elem) return INVALID_OPERATION;
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long minVol = info->min;
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long maxVol = info->max;
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// Make sure volume is between bounds.
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long vol = minVol + volume * (maxVol - minVol);
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if (vol > maxVol) vol = maxVol;
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if (vol < minVol) vol = minVol;
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info->volume = vol;
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snd_mixer_selem_set_playback_volume_all (info->elem, vol);
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return NO_ERROR;
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}
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status_t ALSAMixer::setMasterGain(float gain)
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{
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mixer_info_t *info = mixerMasterProp[SND_PCM_STREAM_CAPTURE].mInfo;
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if (!info || !info->elem) return INVALID_OPERATION;
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long minVol = info->min;
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long maxVol = info->max;
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// Make sure volume is between bounds.
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long vol = minVol + gain * (maxVol - minVol);
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if (vol > maxVol) vol = maxVol;
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if (vol < minVol) vol = minVol;
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info->volume = vol;
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snd_mixer_selem_set_capture_volume_all (info->elem, vol);
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return NO_ERROR;
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}
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status_t ALSAMixer::setVolume(uint32_t device, float left, float right)
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{
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for (int j = 0; mixerProp[j][SND_PCM_STREAM_PLAYBACK].device; j++)
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if (mixerProp[j][SND_PCM_STREAM_PLAYBACK].device & device) {
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mixer_info_t *info = mixerProp[j][SND_PCM_STREAM_PLAYBACK].mInfo;
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if (!info || !info->elem) return INVALID_OPERATION;
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long minVol = info->min;
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long maxVol = info->max;
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// Make sure volume is between bounds.
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long vol = minVol + left * (maxVol - minVol);
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if (vol > maxVol) vol = maxVol;
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if (vol < minVol) vol = minVol;
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info->volume = vol;
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snd_mixer_selem_set_playback_volume_all (info->elem, vol);
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}
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return NO_ERROR;
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}
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status_t ALSAMixer::setGain(uint32_t device, float gain)
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{
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for (int j = 0; mixerProp[j][SND_PCM_STREAM_CAPTURE].device; j++)
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if (mixerProp[j][SND_PCM_STREAM_CAPTURE].device & device) {
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mixer_info_t *info = mixerProp[j][SND_PCM_STREAM_CAPTURE].mInfo;
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if (!info || !info->elem) return INVALID_OPERATION;
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long minVol = info->min;
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long maxVol = info->max;
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// Make sure volume is between bounds.
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long vol = minVol + gain * (maxVol - minVol);
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if (vol > maxVol) vol = maxVol;
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if (vol < minVol) vol = minVol;
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info->volume = vol;
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snd_mixer_selem_set_capture_volume_all (info->elem, vol);
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}
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return NO_ERROR;
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}
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status_t ALSAMixer::setCaptureMuteState(uint32_t device, bool state)
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{
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for (int j = 0; mixerProp[j][SND_PCM_STREAM_CAPTURE].device; j++)
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if (mixerProp[j][SND_PCM_STREAM_CAPTURE].device & device) {
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mixer_info_t *info = mixerProp[j][SND_PCM_STREAM_CAPTURE].mInfo;
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if (!info || !info->elem) return INVALID_OPERATION;
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if (snd_mixer_selem_has_capture_switch (info->elem)) {
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int err = snd_mixer_selem_set_capture_switch_all (info->elem, static_cast<int>(!state));
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if (err < 0) {
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ALOGE("Unable to %s capture mixer switch %s",
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state ? "enable" : "disable", info->name);
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return INVALID_OPERATION;
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}
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}
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info->mute = state;
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}
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return NO_ERROR;
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}
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status_t ALSAMixer::getCaptureMuteState(uint32_t device, bool *state)
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{
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if (!state) return BAD_VALUE;
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for (int j = 0; mixerProp[j][SND_PCM_STREAM_CAPTURE].device; j++)
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if (mixerProp[j][SND_PCM_STREAM_CAPTURE].device & device) {
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mixer_info_t *info = mixerProp[j][SND_PCM_STREAM_CAPTURE].mInfo;
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if (!info || !info->elem) return INVALID_OPERATION;
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*state = info->mute;
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return NO_ERROR;
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}
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return BAD_VALUE;
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}
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status_t ALSAMixer::setPlaybackMuteState(uint32_t device, bool state)
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{
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for (int j = 0; mixerProp[j][SND_PCM_STREAM_PLAYBACK].device; j++)
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if (mixerProp[j][SND_PCM_STREAM_PLAYBACK].device & device) {
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mixer_info_t *info = mixerProp[j][SND_PCM_STREAM_PLAYBACK].mInfo;
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if (!info || !info->elem) return INVALID_OPERATION;
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if (snd_mixer_selem_has_playback_switch (info->elem)) {
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int err = snd_mixer_selem_set_playback_switch_all (info->elem, static_cast<int>(!state));
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if (err < 0) {
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ALOGE("Unable to %s playback mixer switch %s",
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state ? "enable" : "disable", info->name);
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return INVALID_OPERATION;
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}
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}
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info->mute = state;
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}
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return NO_ERROR;
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}
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status_t ALSAMixer::getPlaybackMuteState(uint32_t device, bool *state)
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{
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if (!state) return BAD_VALUE;
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for (int j = 0; mixerProp[j][SND_PCM_STREAM_PLAYBACK].device; j++)
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if (mixerProp[j][SND_PCM_STREAM_PLAYBACK].device & device) {
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mixer_info_t *info = mixerProp[j][SND_PCM_STREAM_PLAYBACK].mInfo;
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if (!info || !info->elem) return INVALID_OPERATION;
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*state = info->mute;
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return NO_ERROR;
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}
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return BAD_VALUE;
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}
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}; // namespace android
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