frameworks/base/media/java/android/media/AudioService.java
//direction 一般取1(音量+)，0， -1(音量-)
public void adjustSuggestedStreamVolume(int direction, int suggestedStreamType, int flags,
String callingPackage) {
adjustSuggestedStreamVolume(direction, suggestedStreamType, flags, callingPackage,
Binder.getCallingUid());
}
private void adjustStreamVolume(int streamType, int direction, int flags,
String callingPackage, int uid) {
if (mUseFixedVolume) {
return;
}
if (DEBUG_VOL) Log.d(TAG, "adjustStreamVolume() stream="+streamType+", dir="+direction
+ ", flags="+flags);
ensureValidDirection(direction);
ensureValidStreamType(streamType);
// use stream type alias here so that streams with same alias have the same behavior,
// including with regard to silent mode control (e.g the use of STREAM_RING below and in
// checkForRingerModeChange() in place of STREAM_RING or STREAM_NOTIFICATION)
int streamTypeAlias = mStreamVolumeAlias[streamType];
VolumeStreamState streamState = mStreamStates[streamTypeAlias];
final int device = getDeviceForStream(streamTypeAlias);
int aliasIndex = streamState.getIndex(device);
boolean adjustVolume = true;
int step;
// skip a2dp absolute volume control request when the device
// is not an a2dp device
if ((device & AudioSystem.DEVICE_OUT_ALL_A2DP) == 0 &&
(flags & AudioManager.FLAG_BLUETOOTH_ABS_VOLUME) != 0) {
return;
}
if (mAppOps.noteOp(STEAM_VOLUME_OPS[streamTypeAlias], uid, callingPackage)
!= AppOpsManager.MODE_ALLOWED) {
return;
}
// reset any pending volume command
synchronized (mSafeMediaVolumeState) {
mPendingVolumeCommand = null;
}
flags &= ~AudioManager.FLAG_FIXED_VOLUME;
if ((streamTypeAlias == AudioSystem.STREAM_MUSIC) &&
((device & mFixedVolumeDevices) != 0)) {
flags |= AudioManager.FLAG_FIXED_VOLUME;
// Always toggle between max safe volume and 0 for fixed volume devices where safe
// volume is enforced, and max and 0 for the others.
// This is simulated by stepping by the full allowed volume range
if (mSafeMediaVolumeState == SAFE_MEDIA_VOLUME_ACTIVE &&
(device & mSafeMediaVolumeDevices) != 0) {
step = mSafeMediaVolumeIndex;
} else {
step = streamState.getMaxIndex();
}
if (aliasIndex != 0) {
aliasIndex = step;
}
} else {
// convert one UI step (+/-1) into a number of internal units on the stream alias
step = rescaleIndex(10, streamType, streamTypeAlias);
}
// If either the client forces allowing ringer modes for this adjustment,
// or the stream type is one that is affected by ringer modes
if (((flags & AudioManager.FLAG_ALLOW_RINGER_MODES) != 0) ||
(streamTypeAlias == getMasterStreamType())) {
int ringerMode = getRingerMode();
// do not vibrate if already in vibrate mode
if (ringerMode == AudioManager.RINGER_MODE_VIBRATE) {
flags &= ~AudioManager.FLAG_VIBRATE;
}
// Check if the ringer mode changes with this volume adjustment. If
// it does, it will handle adjusting the volume, so we won't below
final int result = checkForRingerModeChange(aliasIndex, direction, step);
adjustVolume = (result & FLAG_ADJUST_VOLUME) != 0;
// If suppressing a volume adjustment in silent mode, display the UI hint
if ((result & AudioManager.FLAG_SHOW_SILENT_HINT) != 0) {
flags |= AudioManager.FLAG_SHOW_SILENT_HINT;
}
}
int oldIndex = mStreamStates[streamType].getIndex(device);
if (adjustVolume && (direction != AudioManager.ADJUST_SAME)) {
// Check if volume update should be send to AVRCP
if (streamTypeAlias == AudioSystem.STREAM_MUSIC &&
(device & AudioSystem.DEVICE_OUT_ALL_A2DP) != 0 &&
(flags & AudioManager.FLAG_BLUETOOTH_ABS_VOLUME) == 0) {
synchronized (mA2dpAvrcpLock) {
if (mA2dp != null && mAvrcpAbsVolSupported) {
mA2dp.adjustAvrcpAbsoluteVolume(direction);
}
}
}
if ((direction == AudioManager.ADJUST_RAISE) &&
!checkSafeMediaVolume(streamTypeAlias, aliasIndex + step, device)) {
//這里是看是否需要針對特定設備顯示音量警告界面
Log.e(TAG, "adjustStreamVolume() safe volume index = "+oldIndex);
mVolumeController.postDisplaySafeVolumeWarning(flags);
} else if (streamState.adjustIndex(direction * step, device)) {
//這里會存儲音量，並且向底層設置音量
// Post message to set system volume (it in turn will post a message
// to persist). Do not change volume if stream is muted.
sendMsg(mAudioHandler,
MSG_SET_DEVICE_VOLUME,
SENDMSG_QUEUE,
device,
0,
streamState,
0);
}
// Check if volume update should be send to Hdmi system audio.
int newIndex = mStreamStates[streamType].getIndex(device);
if (mHdmiManager != null) {
synchronized (mHdmiManager) {
if (mHdmiTvClient != null &&
streamTypeAlias == AudioSystem.STREAM_MUSIC &&
(flags & AudioManager.FLAG_HDMI_SYSTEM_AUDIO_VOLUME) == 0 &&
oldIndex != newIndex) {
int maxIndex = getStreamMaxVolume(streamType);
synchronized (mHdmiTvClient) {
if (mHdmiSystemAudioSupported) {
mHdmiTvClient.setSystemAudioVolume(
(oldIndex + 5) / 10, (newIndex + 5) / 10, maxIndex);
}
}
}
// mHdmiCecSink true => mHdmiPlaybackClient != null
if (mHdmiCecSink &&
streamTypeAlias == AudioSystem.STREAM_MUSIC &&
oldIndex != newIndex) {
synchronized (mHdmiPlaybackClient) {
int keyCode = (direction == -1) ? KeyEvent.KEYCODE_VOLUME_DOWN :
KeyEvent.KEYCODE_VOLUME_UP;
mHdmiPlaybackClient.sendKeyEvent(keyCode, true);
mHdmiPlaybackClient.sendKeyEvent(keyCode, false);
}
}
}
}
}
int index = mStreamStates[streamType].getIndex(device);
sendVolumeUpdate(streamType, oldIndex, index, flags);
}
//mSafeMediaVolumeState並非一直是SAFE_MEDIA_VOLUME_ACTIVE, 警告界面設置后狀態為SAFE_MEDIA_VOLUME_INACTIVE //會針對音量大於一定值時計時,當時間超過20個小時時，會修改狀態為SAFE_MEDIA_VOLUME_ACTIVE，當再次調節音量， //該音量超過警告值時，會再次彈出警告界面
private boolean checkSafeMediaVolume(int streamType, int index, int device) {
synchronized (mSafeMediaVolumeState) {
if ((mSafeMediaVolumeState == SAFE_MEDIA_VOLUME_ACTIVE) &&
(mStreamVolumeAlias[streamType] == AudioSystem.STREAM_MUSIC) &&
((device & mSafeMediaVolumeDevices) != 0) &&
(index > mSafeMediaVolumeIndex)) {
return false;
}
return true;
}
}
// mMusicActiveMs is the cumulative time of music activity since safe volume was disabled.
// When this time reaches UNSAFE_VOLUME_MUSIC_ACTIVE_MS_MAX, the safe media volume is re-enabled
// automatically. mMusicActiveMs is rounded to a multiple of MUSIC_ACTIVE_POLL_PERIOD_MS.
private int mMusicActiveMs;
private static final int UNSAFE_VOLUME_MUSIC_ACTIVE_MS_MAX = (20 * 3600 * 1000); // 20 hours
private static final int MUSIC_ACTIVE_POLL_PERIOD_MS = 60000; // 1 minute polling interval
private void onCheckMusicActive() {
synchronized (mSafeMediaVolumeState) {
if (mSafeMediaVolumeState == SAFE_MEDIA_VOLUME_INACTIVE) {
int device = getDeviceForStream(AudioSystem.STREAM_MUSIC);
if ((device & mSafeMediaVolumeDevices) != 0) {
//循環消息，不停的統計音量超值時間，1分鍾統計一次
sendMsg(mAudioHandler,
MSG_CHECK_MUSIC_ACTIVE,
SENDMSG_REPLACE,
0,
0,
null,
MUSIC_ACTIVE_POLL_PERIOD_MS);
int index = mStreamStates[AudioSystem.STREAM_MUSIC].getIndex(device);
if (AudioSystem.isStreamActive(AudioSystem.STREAM_MUSIC, 0) &&
(index > mSafeMediaVolumeIndex)) {
// Approximate cumulative active music time
mMusicActiveMs += MUSIC_ACTIVE_POLL_PERIOD_MS;
if (mMusicActiveMs > UNSAFE_VOLUME_MUSIC_ACTIVE_MS_MAX) {
setSafeMediaVolumeEnabled(true);
mMusicActiveMs = 0;
}
saveMusicActiveMs();
}
}
}
}
}
frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
/** {@inheritDoc} */
@Override
public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {
if (!mSystemBooted) {
// If we have not yet booted, don't let key events do anything.
return 0;
}
final boolean interactive = (policyFlags & FLAG_INTERACTIVE) != 0;
final boolean down = event.getAction() == KeyEvent.ACTION_DOWN;
final boolean canceled = event.isCanceled();
final int keyCode = event.getKeyCode();
if(isAlarmBoot() && keyCode != KeyEvent.KEYCODE_VOLUME_UP && keyCode != KeyEvent.KEYCODE_VOLUME_DOWN){
return 0;
}
final boolean isInjected = (policyFlags & WindowManagerPolicy.FLAG_INJECTED) != 0;
// If screen is off then we treat the case where the keyguard is open but hidden
// the same as if it were open and in front.
// This will prevent any keys other than the power button from waking the screen
// when the keyguard is hidden by another activity.
final boolean keyguardActive = (mKeyguardDelegate == null ? false :
(interactive ?
mKeyguardDelegate.isShowingAndNotOccluded() :
mKeyguardDelegate.isShowing()));
if (DEBUG_INPUT) {
Log.d(TAG, "interceptKeyTq keycode=" + keyCode
+ " interactive=" + interactive + " keyguardActive=" + keyguardActive
+ " policyFlags=" + Integer.toHexString(policyFlags));
}
// Basic policy based on interactive state.
int result;
boolean isWakeKey = (policyFlags & WindowManagerPolicy.FLAG_WAKE) != 0
|| event.isWakeKey();
if (interactive || (isInjected && !isWakeKey)) {
// When the device is interactive or the key is injected pass the
// key to the application.
result = ACTION_PASS_TO_USER;
isWakeKey = false;
} else if (!interactive && shouldDispatchInputWhenNonInteractive()) {
// If we're currently dozing with the screen on and the keyguard showing, pass the key
// to the application but preserve its wake key status to make sure we still move
// from dozing to fully interactive if we would normally go from off to fully
// interactive.
result = ACTION_PASS_TO_USER;
} else {
// When the screen is off and the key is not injected, determine whether
// to wake the device but don't pass the key to the application.
result = 0;
if (isWakeKey && (!down || !isWakeKeyWhenScreenOff(keyCode))) {
isWakeKey = false;
}
}
// If the key would be handled globally, just return the result, don't worry about special
// key processing.
if (mGlobalKeyManager.shouldHandleGlobalKey(keyCode, event)) {
if (isWakeKey) {
mPowerManager.wakeUp(event.getEventTime());
}
return result;
}
boolean useHapticFeedback = down
&& (policyFlags & WindowManagerPolicy.FLAG_VIRTUAL) != 0
&& event.getRepeatCount() == 0;
// Handle special keys.
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_DOWN:
case KeyEvent.KEYCODE_VOLUME_UP:
case KeyEvent.KEYCODE_VOLUME_MUTE: {
if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
if (down) {
if (interactive && !mVolumeDownKeyTriggered
&& (event.getFlags() & KeyEvent.FLAG_FALLBACK) == 0) {
mVolumeDownKeyTriggered = true;
mVolumeDownKeyTime = event.getDownTime();
mVolumeDownKeyConsumedByScreenshotChord = false;
cancelPendingPowerKeyAction();
interceptScreenshotChord();
}
} else {
mVolumeDownKeyTriggered = false;
cancelPendingScreenshotChordAction();
}
} else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
if (down) {
if (interactive && !mVolumeUpKeyTriggered
&& (event.getFlags() & KeyEvent.FLAG_FALLBACK) == 0) {
mVolumeUpKeyTriggered = true;
cancelPendingPowerKeyAction();
cancelPendingScreenshotChordAction();
}
} else {
mVolumeUpKeyTriggered = false;
cancelPendingScreenshotChordAction();
}
}
if (down) {
TelecomManager telecomManager = getTelecommService();
if (telecomManager != null) {
if (telecomManager.isRinging()) {
// If an incoming call is ringing, either VOLUME key means
// "silence ringer". We handle these keys here, rather than
// in the InCallScreen, to make sure we'll respond to them
// even if the InCallScreen hasn't come to the foreground yet.
// Look for the DOWN event here, to agree with the "fallback"
// behavior in the InCallScreen.
Log.i(TAG, "interceptKeyBeforeQueueing:"
+ " VOLUME key-down while ringing: Silence ringer!");
// Silence the ringer. (It's safe to call this
// even if the ringer has already been silenced.)
telecomManager.silenceRinger();
// And *don't* pass this key thru to the current activity
// (which is probably the InCallScreen.)
result &= ~ACTION_PASS_TO_USER;
break;
}
if (telecomManager.isInCall()
&& (result & ACTION_PASS_TO_USER) == 0) {
// If we are in call but we decided not to pass the key to
// the application, just pass it to the session service.
MediaSessionLegacyHelper.getHelper(mContext)
.sendVolumeKeyEvent(event, false);
break;
}
}
if ((result & ACTION_PASS_TO_USER) == 0) {
// If we aren't passing to the user and no one else
// handled it send it to the session manager to figure
// out.
MediaSessionLegacyHelper.getHelper(mContext)
.sendVolumeKeyEvent(event, true);
break;
}
}
break;
}
case KeyEvent.KEYCODE_ENDCALL:
case KeyEvent.KEYCODE_POWER:
case KeyEvent.KEYCODE_SLEEP:
case KeyEvent.KEYCODE_MEDIA_PLAY:
case KeyEvent.KEYCODE_MEDIA_PAUSE:
case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
case KeyEvent.KEYCODE_HEADSETHOOK:
case KeyEvent.KEYCODE_MUTE:
case KeyEvent.KEYCODE_MEDIA_STOP:
case KeyEvent.KEYCODE_MEDIA_NEXT:
case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
case KeyEvent.KEYCODE_MEDIA_REWIND:
case KeyEvent.KEYCODE_MEDIA_RECORD:
case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:
case KeyEvent.KEYCODE_MEDIA_AUDIO_TRACK:
case KeyEvent.KEYCODE_CALL:
case KeyEvent.KEYCODE_BACK:
return result;
}
frameworks/base/media/java/android/media/session/MediaSessionLegacyHelper.java
public void sendVolumeKeyEvent(KeyEvent keyEvent, boolean musicOnly) {
if (keyEvent == null) {
Log.w(TAG, "Tried to send a null key event. Ignoring.");
return;
}
boolean down = keyEvent.getAction() == KeyEvent.ACTION_DOWN;
boolean up = keyEvent.getAction() == KeyEvent.ACTION_UP;
int direction = 0;
switch (keyEvent.getKeyCode()) {
case KeyEvent.KEYCODE_VOLUME_UP:
direction = AudioManager.ADJUST_RAISE;
break;
case KeyEvent.KEYCODE_VOLUME_DOWN:
direction = AudioManager.ADJUST_LOWER;
break;
case KeyEvent.KEYCODE_VOLUME_MUTE:
// TODO
break;
}
if ((down || up) && direction != 0) {
int flags;
// If this is action up we want to send a beep for non-music events
if (up) {
direction = 0;
}
if (musicOnly) {
// This flag is used when the screen is off to only affect
// active media
flags = AudioManager.FLAG_ACTIVE_MEDIA_ONLY;
} else {
// These flags are consistent with the home screen
if (up) {
flags = AudioManager.FLAG_PLAY_SOUND | AudioManager.FLAG_VIBRATE;
} else {
flags = AudioManager.FLAG_SHOW_UI | AudioManager.FLAG_VIBRATE;
}
}
mSessionManager.dispatchAdjustVolume(AudioManager.USE_DEFAULT_STREAM_TYPE,
direction, flags);
}
}
frameworks/base/media/java/android/media/session/MediaSessionManager.java
/**
* Dispatch an adjust volume request to the system. It will be sent to the
* most relevant audio stream or media session. The direction must be one of
* {@link AudioManager#ADJUST_LOWER}, {@link AudioManager#ADJUST_RAISE},
* {@link AudioManager#ADJUST_SAME}.
*
* @param suggestedStream The stream to fall back to if there isn't a
* relevant stream
* @param direction The direction to adjust volume in.
* @param flags Any flags to include with the volume change.
* @hide
*/
public void dispatchAdjustVolume(int suggestedStream, int direction, int flags) {
try {
mService.dispatchAdjustVolume(suggestedStream, direction, flags);
} catch (RemoteException e) {
Log.e(TAG, "Failed to send adjust volume.", e);
}
}
frameworks/base/services/core/java/com/android/server/media/MediaSessionService.java
@Override
public void dispatchAdjustVolume(int suggestedStream, int delta, int flags)
throws RemoteException {
final int pid = Binder.getCallingPid();
final int uid = Binder.getCallingUid();
final long token = Binder.clearCallingIdentity();
try {
synchronized (mLock) {
MediaSessionRecord session = mPriorityStack
.getDefaultVolumeSession(mCurrentUserId);
dispatchAdjustVolumeLocked(suggestedStream, delta, flags, session);
}
} finally {
Binder.restoreCallingIdentity(token);
}
}
private void dispatchAdjustVolumeLocked(int suggestedStream, int direction, int flags,
MediaSessionRecord session) {
if (DEBUG) {
String description = session == null ? null : session.toString();
Log.d(TAG, "Adjusting session " + description + " by " + direction + ". flags="
+ flags + ", suggestedStream=" + suggestedStream);
}
if (session == null) {
if ((flags & AudioManager.FLAG_ACTIVE_MEDIA_ONLY) != 0
&& !AudioSystem.isStreamActive(AudioManager.STREAM_MUSIC, 0)) {
if (DEBUG) {
Log.d(TAG, "No active session to adjust, skipping media only volume event");
}
return;
}
try {
mAudioService.adjustSuggestedStreamVolume(direction, suggestedStream, flags, getContext().getOpPackageName());
} catch (RemoteException e) {
Log.e(TAG, "Error adjusting default volume.", e);
}
} else {
session.adjustVolume(direction, flags, getContext().getPackageName(),
UserHandle.myUserId(), true);
if (session.getPlaybackType() == PlaybackInfo.PLAYBACK_TYPE_REMOTE
&& mRvc != null) {
try {
mRvc.remoteVolumeChanged(session.getControllerBinder(), flags);
} catch (Exception e) {
Log.wtf(TAG, "Error sending volume change to system UI.", e);
}
}
}
}
