audio policy: add support for custom mixes

Add support for custom mixes in AudioPolicyManager.

Two methods are added to register or unregister a list of custom mixes
with their attributes and format.

getOutputForAttr() and getInputForAttr() first look for a match in
registered mixes before defaulting to normal output/input selection

Remote submix device connection disconnection now takes address into
account to identify the correspnoding custom mix.

Bug: 16009464.

Change-Id: I3f1c2a485a0fb71b1f984ed0adc9b68aa971e408

3 files changed, 125 insertions, 1 deletions

diff --git a/media/libmedia/Android.mk b/media/libmedia/Android.mk
index e012116..a2e0909 100644
--- a/media/libmedia/Android.mk
+++ b/media/libmedia/Android.mk
@@ -59,7 +59,8 @@ LOCAL_SRC_FILES:= \
     MemoryLeakTrackUtil.cpp \
     SoundPool.cpp \
     SoundPoolThread.cpp \
-    StringArray.cpp
+    StringArray.cpp \
+    AudioPolicy.cpp
 
 LOCAL_SRC_FILES += ../libnbaio/roundup.c
 
diff --git a/media/libmedia/AudioPolicy.cpp b/media/libmedia/AudioPolicy.cpp
new file mode 100644
index 0000000..d2d0971
--- /dev/null
+++ b/media/libmedia/AudioPolicy.cpp
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "AudioPolicy"
+//#define LOG_NDEBUG 0
+#include <utils/Log.h>
+#include <media/AudioPolicy.h>
+
+namespace android {
+
+//
+//  AttributeMatchCriterion implementation
+//
+AttributeMatchCriterion::AttributeMatchCriterion(audio_usage_t usage,
+                                                 audio_source_t source,
+                                                 uint32_t rule)
+: mRule(rule)
+{
+    if (mRule == RULE_MATCH_ATTRIBUTE_USAGE ||
+            mRule == RULE_EXCLUDE_ATTRIBUTE_USAGE) {
+        mAttr.mUsage = usage;
+    } else {
+        mAttr.mSource = source;
+    }
+}
+
+status_t AttributeMatchCriterion::readFromParcel(Parcel *parcel)
+{
+    mRule = parcel->readInt32();
+    if (mRule == RULE_MATCH_ATTRIBUTE_USAGE ||
+            mRule == RULE_EXCLUDE_ATTRIBUTE_USAGE) {
+        mAttr.mUsage = (audio_usage_t)parcel->readInt32();
+    } else {
+        mAttr.mSource = (audio_source_t)parcel->readInt32();
+    }
+    return NO_ERROR;
+}
+
+status_t AttributeMatchCriterion::writeToParcel(Parcel *parcel) const
+{
+    parcel->writeInt32(mRule);
+    parcel->writeInt32(mAttr.mUsage);
+    return NO_ERROR;
+}
+
+//
+//  AudioMix implementation
+//
+
+status_t AudioMix::readFromParcel(Parcel *parcel)
+{
+    mMixType = parcel->readInt32();
+    mFormat.sample_rate = (uint32_t)parcel->readInt32();
+    mFormat.channel_mask = (audio_channel_mask_t)parcel->readInt32();
+    mFormat.format = (audio_format_t)parcel->readInt32();
+    mRouteFlags = parcel->readInt32();
+    mRegistrationId = parcel->readString8();
+    size_t size = (size_t)parcel->readInt32();
+    if (size > MAX_CRITERIA_PER_MIX) {
+        size = MAX_CRITERIA_PER_MIX;
+    }
+    for (size_t i = 0; i < size; i++) {
+        AttributeMatchCriterion criterion;
+        if (criterion.readFromParcel(parcel) == NO_ERROR) {
+            mCriteria.add(criterion);
+        }
+    }
+    return NO_ERROR;
+}
+
+status_t AudioMix::writeToParcel(Parcel *parcel) const
+{
+    parcel->writeInt32(mMixType);
+    parcel->writeInt32(mFormat.sample_rate);
+    parcel->writeInt32(mFormat.channel_mask);
+    parcel->writeInt32(mFormat.format);
+    parcel->writeInt32(mRouteFlags);
+    parcel->writeString8(mRegistrationId);
+    size_t size = mCriteria.size();
+    if (size > MAX_CRITERIA_PER_MIX) {
+        size = MAX_CRITERIA_PER_MIX;
+    }
+    size_t sizePosition = parcel->dataPosition();
+    parcel->writeInt32(size);
+    size_t finalSize = size;
+    for (size_t i = 0; i < size; i++) {
+        size_t position = parcel->dataPosition();
+        if (mCriteria[i].writeToParcel(parcel) != NO_ERROR) {
+            parcel->setDataPosition(position);
+            finalSize--;
+        }
+    }
+    if (size != finalSize) {
+        size_t position = parcel->dataPosition();
+        parcel->setDataPosition(sizePosition);
+        parcel->writeInt32(finalSize);
+        parcel->setDataPosition(position);
+    }
+    return NO_ERROR;
+}
+
+}; // namespace android
diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index e4c3c08..d9c3177 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -851,6 +851,10 @@ status_t AudioTrack::getPosition(uint32_t *position)
         // due to hardware latency. We leave this behavior for now.
         *position = dspFrames;
     } else {
+        if (mCblk->mFlags & CBLK_INVALID) {
+            restoreTrack_l("getPosition");
+        }
+
         // IAudioTrack::stop() isn't synchronous; we don't know when presentation completes
         *position = (mState == STATE_STOPPED || mState == STATE_FLUSHED) ?
                 0 : updateAndGetPosition_l();
@@ -1946,6 +1950,10 @@ status_t AudioTrack::getTimestamp(AudioTimestamp& timestamp)
         break;
     }
 
+    if (mCblk->mFlags & CBLK_INVALID) {
+        restoreTrack_l("getTimestamp");
+    }
+
     // The presented frame count must always lag behind the consumed frame count.
     // To avoid a race, read the presented frames first.  This ensures that presented <= consumed.
     status_t status = mAudioTrack->getTimestamp(timestamp);