APM: Avoid route change mute of isolated sounds
Test: Notification and touch sound
Bug: 65497566
Change-Id: I1ebe375dcac908ef3b9de18010366a59d041fdb2
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 906e05a..89e5d77 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -1224,6 +1224,12 @@
bool force = !outputDesc->isActive() &&
(outputDesc->getPatchHandle() == AUDIO_PATCH_HANDLE_NONE);
+ // requiresMuteCheck is false when we can bypass mute strategy.
+ // It covers a common case when there is no materially active audio
+ // and muting would result in unnecessary delay and dropped audio.
+ const uint32_t outputLatencyMs = outputDesc->latency();
+ bool requiresMuteCheck = outputDesc->isActive(outputLatencyMs * 2); // account for drain
+
// increment usage count for this stream on the requested output:
// NOTE that the usage count is the same for duplicated output and hardware output which is
// necessary for a correct control of hardware output routing by startOutput() and stopOutput()
@@ -1247,29 +1253,44 @@
for (size_t i = 0; i < mOutputs.size(); i++) {
sp<AudioOutputDescriptor> desc = mOutputs.valueAt(i);
if (desc != outputDesc) {
+ // An output has a shared device if
+ // - managed by the same hw module
+ // - supports the currently selected device
+ const bool sharedDevice = outputDesc->sharesHwModuleWith(desc)
+ && (desc->supportedDevices() & device) != AUDIO_DEVICE_NONE;
+
// force a device change if any other output is:
// - managed by the same hw module
- // - has a current device selection that differs from selected device.
// - supports currently selected device
+ // - has a current device selection that differs from selected device.
// - has an active audio patch
// In this case, the audio HAL must receive the new device selection so that it can
- // change the device currently selected by the other active output.
- if (outputDesc->sharesHwModuleWith(desc) &&
+ // change the device currently selected by the other output.
+ if (sharedDevice &&
desc->device() != device &&
- desc->supportedDevices() & device &&
desc->getPatchHandle() != AUDIO_PATCH_HANDLE_NONE) {
force = true;
}
// wait for audio on other active outputs to be presented when starting
// a notification so that audio focus effect can propagate, or that a mute/unmute
// event occurred for beacon
- uint32_t latency = desc->latency();
- if (shouldWait && desc->isActive(latency * 2) && (waitMs < latency)) {
- waitMs = latency;
+ const uint32_t latencyMs = desc->latency();
+ const bool isActive = desc->isActive(latencyMs * 2); // account for drain
+
+ if (shouldWait && isActive && (waitMs < latencyMs)) {
+ waitMs = latencyMs;
}
+
+ // Require mute check if another output is on a shared device
+ // and currently active to have proper drain and avoid pops.
+ // Note restoring AudioTracks onto this output needs to invoke
+ // a volume ramp if there is no mute.
+ requiresMuteCheck |= sharedDevice && isActive;
}
}
- uint32_t muteWaitMs = setOutputDevice(outputDesc, device, force, 0, NULL, address);
+
+ const uint32_t muteWaitMs =
+ setOutputDevice(outputDesc, device, force, 0, NULL, address, requiresMuteCheck);
// handle special case for sonification while in call
if (isInCall()) {
@@ -1294,6 +1315,14 @@
if (waitMs > muteWaitMs) {
*delayMs = waitMs - muteWaitMs;
}
+
+ // FIXME: A device change (muteWaitMs > 0) likely introduces a volume change.
+ // A volume change enacted by APM with 0 delay is not synchronous, as it goes
+ // via AudioCommandThread to AudioFlinger. Hence it is possible that the volume
+ // change occurs after the MixerThread starts and causes a stream volume
+ // glitch.
+ //
+ // We do not introduce additional delay here.
}
return NO_ERROR;
@@ -4812,21 +4841,24 @@
bool force,
int delayMs,
audio_patch_handle_t *patchHandle,
- const char* address)
+ const char *address,
+ bool requiresMuteCheck)
{
ALOGV("setOutputDevice() device %04x delayMs %d", device, delayMs);
AudioParameter param;
uint32_t muteWaitMs;
if (outputDesc->isDuplicated()) {
- muteWaitMs = setOutputDevice(outputDesc->subOutput1(), device, force, delayMs);
- muteWaitMs += setOutputDevice(outputDesc->subOutput2(), device, force, delayMs);
+ muteWaitMs = setOutputDevice(outputDesc->subOutput1(), device, force, delayMs,
+ nullptr /* patchHandle */, nullptr /* address */, requiresMuteCheck);
+ muteWaitMs += setOutputDevice(outputDesc->subOutput2(), device, force, delayMs,
+ nullptr /* patchHandle */, nullptr /* address */, requiresMuteCheck);
return muteWaitMs;
}
// no need to proceed if new device is not AUDIO_DEVICE_NONE and not supported by current
// output profile
if ((device != AUDIO_DEVICE_NONE) &&
- ((device & outputDesc->supportedDevices()) == 0)) {
+ ((device & outputDesc->supportedDevices()) == AUDIO_DEVICE_NONE)) {
return 0;
}
@@ -4840,7 +4872,14 @@
if (device != AUDIO_DEVICE_NONE) {
outputDesc->mDevice = device;
}
- muteWaitMs = checkDeviceMuteStrategies(outputDesc, prevDevice, delayMs);
+
+ // if the outputs are not materially active, there is no need to mute.
+ if (requiresMuteCheck) {
+ muteWaitMs = checkDeviceMuteStrategies(outputDesc, prevDevice, delayMs);
+ } else {
+ ALOGV("%s: suppressing checkDeviceMuteStrategies", __func__);
+ muteWaitMs = 0;
+ }
// Do not change the routing if:
// the requested device is AUDIO_DEVICE_NONE
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.h b/services/audiopolicy/managerdefault/AudioPolicyManager.h
index 7ba0669..1b0c315 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.h
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.h
@@ -300,7 +300,8 @@
bool force = false,
int delayMs = 0,
audio_patch_handle_t *patchHandle = NULL,
- const char* address = NULL);
+ const char *address = nullptr,
+ bool requiresMuteCheck = true);
status_t resetOutputDevice(const sp<AudioOutputDescriptor>& outputDesc,
int delayMs = 0,
audio_patch_handle_t *patchHandle = NULL);