libaudiohal@aidl: Fix 'pause' handling
In case of transient states like DRAINING, the HAL may change its
StreamDescriptor::State on its own and may not be in synchronization with client. Thus, client can send the unexpected command and HAL returns failure. such failure is natural. The client handles it gracefully.
Example where HAL change its state,
1) DRAINING -> IDLE (on empty buffer)
2) DRAINING -> IDLE (on IStreamCallback::onDrainReady)
Also, refactor the resume implementation.
BUG: 363958142
Test: play compress offload playback
Change-Id: I1cd7ec96cfa7e20c69c03ec8aae088d1954adda2
diff --git a/media/libaudiohal/impl/StreamHalAidl.cpp b/media/libaudiohal/impl/StreamHalAidl.cpp
index d65701a..9863fec 100644
--- a/media/libaudiohal/impl/StreamHalAidl.cpp
+++ b/media/libaudiohal/impl/StreamHalAidl.cpp
@@ -443,9 +443,29 @@
if (!mStream) return NO_INIT;
if (const auto state = getState(); isInPlayOrRecordState(state)) {
- return sendCommand(
- makeHalCommand<HalCommand::Tag::pause>(), reply,
+ StreamDescriptor::Reply localReply{};
+ StreamDescriptor::Reply* innerReply = reply ?: &localReply;
+ auto status = sendCommand(
+ makeHalCommand<HalCommand::Tag::pause>(), innerReply,
true /*safeFromNonWorkerThread*/); // The workers stops its I/O activity first.
+ if (status == STATUS_INVALID_OPERATION &&
+ !isInPlayOrRecordState(innerReply->state)) {
+ /**
+ * In case of transient states like DRAINING, the HAL may change its
+ * StreamDescriptor::State on its own and may not be in synchronization with client.
+ * Thus, client can send the unexpected command and HAL returns failure. such failure is
+ * natural. The client handles it gracefully.
+ * Example where HAL change its state,
+ * 1) DRAINING -> IDLE (on empty buffer)
+ * 2) DRAINING -> IDLE (on IStreamCallback::onDrainReady)
+ **/
+ AUGMENT_LOG(D,
+ "HAL failed to handle the 'pause' command, but stream state is in one of"
+ " the PAUSED kind of states, current state: %s",
+ toString(state).c_str());
+ return OK;
+ }
+ return status;
} else {
AUGMENT_LOG(D, "already stream in one of the PAUSED kind of states, current state: %s",
toString(state).c_str());
@@ -473,13 +493,9 @@
return INVALID_OPERATION;
}
return OK;
- } else if (state == StreamDescriptor::State::PAUSED ||
- state == StreamDescriptor::State::TRANSFER_PAUSED ||
- state == StreamDescriptor::State::DRAIN_PAUSED) {
+ } else if (isInPausedState(state)) {
return sendCommand(makeHalCommand<HalCommand::Tag::start>(), reply);
- } else if (state == StreamDescriptor::State::ACTIVE ||
- state == StreamDescriptor::State::TRANSFERRING ||
- state == StreamDescriptor::State::DRAINING) {
+ } else if (isInPlayOrRecordState(state)) {
AUGMENT_LOG(D, "already in stream state: %s", toString(state).c_str());
return OK;
} else {