diff --git a/media/libaudiofoundation/include/media/AudioContainers.h b/media/libaudiofoundation/include/media/AudioContainers.h
index b6e6c84..6c01e29 100644
--- a/media/libaudiofoundation/include/media/AudioContainers.h
+++ b/media/libaudiofoundation/include/media/AudioContainers.h
@@ -66,6 +66,9 @@
     for (const auto &channel : channelMasks) {
         if (audio_channel_mask_out_to_in(channel) != AUDIO_CHANNEL_INVALID) {
             inMaskSet.insert(audio_channel_mask_out_to_in(channel));
+        } else if (audio_channel_mask_get_representation(channel)
+                    == AUDIO_CHANNEL_REPRESENTATION_INDEX) {
+            inMaskSet.insert(channel);
         }
     }
     return inMaskSet;
@@ -76,6 +79,9 @@
     for (const auto &channel : channelMasks) {
         if (audio_channel_mask_in_to_out(channel) != AUDIO_CHANNEL_INVALID) {
             outMaskSet.insert(audio_channel_mask_in_to_out(channel));
+        } else if (audio_channel_mask_get_representation(channel)
+                    == AUDIO_CHANNEL_REPRESENTATION_INDEX) {
+            outMaskSet.insert(channel);
         }
     }
     return outMaskSet;
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 7d7ed93..b0c949f 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -68,16 +68,6 @@
 // media / notification / system volume.
 constexpr float IN_CALL_EARPIECE_HEADROOM_DB = 3.f;
 
-// Compressed formats for MSD module, ordered from most preferred to least preferred.
-static const std::vector<audio_format_t> msdCompressedFormatsOrder = {{
-        AUDIO_FORMAT_IEC60958, AUDIO_FORMAT_MAT_2_1, AUDIO_FORMAT_MAT_2_0, AUDIO_FORMAT_E_AC3,
-        AUDIO_FORMAT_AC3, AUDIO_FORMAT_PCM_16_BIT }};
-// Channel masks for MSD module, 3D > 2D > 1D ordering (most preferred to least preferred).
-static const std::vector<audio_channel_mask_t> msdSurroundChannelMasksOrder = {{
-        AUDIO_CHANNEL_OUT_3POINT1POINT2, AUDIO_CHANNEL_OUT_3POINT0POINT2,
-        AUDIO_CHANNEL_OUT_2POINT1POINT2, AUDIO_CHANNEL_OUT_2POINT0POINT2,
-        AUDIO_CHANNEL_OUT_5POINT1, AUDIO_CHANNEL_OUT_STEREO }};
-
 template <typename T>
 bool operator== (const SortedVector<T> &left, const SortedVector<T> &right)
 {
@@ -1644,10 +1634,28 @@
         const AudioProfileVector &sourceProfiles, const AudioProfileVector &sinkProfiles,
         audio_port_config *sourceConfig, audio_port_config *sinkConfig) const
 {
+    // Compressed formats for MSD module, ordered from most preferred to least preferred.
+    static const std::vector<audio_format_t> formatsOrder = {{
+            AUDIO_FORMAT_IEC60958, AUDIO_FORMAT_MAT_2_1, AUDIO_FORMAT_MAT_2_0, AUDIO_FORMAT_E_AC3,
+            AUDIO_FORMAT_AC3, AUDIO_FORMAT_PCM_16_BIT }};
+    static const std::vector<audio_channel_mask_t> channelMasksOrder = [](){
+        // Channel position masks for MSD module, 3D > 2D > 1D ordering (most preferred to least
+        // preferred).
+        std::vector<audio_channel_mask_t> masks = {{
+            AUDIO_CHANNEL_OUT_3POINT1POINT2, AUDIO_CHANNEL_OUT_3POINT0POINT2,
+            AUDIO_CHANNEL_OUT_2POINT1POINT2, AUDIO_CHANNEL_OUT_2POINT0POINT2,
+            AUDIO_CHANNEL_OUT_5POINT1, AUDIO_CHANNEL_OUT_STEREO }};
+        // insert index masks (higher counts most preferred) as preferred over position masks
+        for (int i = 1; i <= AUDIO_CHANNEL_COUNT_MAX; i++) {
+            masks.insert(
+                    masks.begin(), audio_channel_mask_for_index_assignment_from_count(i));
+        }
+        return masks;
+    }();
+
     struct audio_config_base bestSinkConfig;
-    status_t result = findBestMatchingOutputConfig(sourceProfiles, sinkProfiles,
-            msdCompressedFormatsOrder, msdSurroundChannelMasksOrder,
-            true /*preferHigherSamplingRates*/, bestSinkConfig);
+    status_t result = findBestMatchingOutputConfig(sourceProfiles, sinkProfiles, formatsOrder,
+            channelMasksOrder, true /*preferHigherSamplingRates*/, bestSinkConfig);
     if (result != NO_ERROR) {
         ALOGD("%s() no matching config found for sink, hwAvSync: %d",
                 __func__, hwAvSync);
@@ -1669,7 +1677,10 @@
     }
     sourceConfig->sample_rate = bestSinkConfig.sample_rate;
     // Specify exact channel mask to prevent guessing by bit count in PatchPanel.
-    sourceConfig->channel_mask = audio_channel_mask_out_to_in(bestSinkConfig.channel_mask);
+    sourceConfig->channel_mask =
+            audio_channel_mask_get_representation(bestSinkConfig.channel_mask)
+            == AUDIO_CHANNEL_REPRESENTATION_INDEX ?
+            bestSinkConfig.channel_mask : audio_channel_mask_out_to_in(bestSinkConfig.channel_mask);
     sourceConfig->format = bestSinkConfig.format;
     // Copy input stream directly without any processing (e.g. resampling).
     sourceConfig->flags.input = static_cast<audio_input_flags_t>(
diff --git a/services/audiopolicy/tests/audiopolicymanager_tests.cpp b/services/audiopolicy/tests/audiopolicymanager_tests.cpp
index d51c57c..c341b32 100644
--- a/services/audiopolicy/tests/audiopolicymanager_tests.cpp
+++ b/services/audiopolicy/tests/audiopolicymanager_tests.cpp
@@ -446,7 +446,7 @@
     sp<AudioProfile> ac3OutputProfile = new AudioProfile(
             AUDIO_FORMAT_AC3, AUDIO_CHANNEL_OUT_5POINT1, k48000SamplingRate);
     sp<AudioProfile> iec958OutputProfile = new AudioProfile(
-            AUDIO_FORMAT_IEC60958, AUDIO_CHANNEL_OUT_STEREO, k48000SamplingRate);
+            AUDIO_FORMAT_IEC60958, AUDIO_CHANNEL_INDEX_MASK_24, k48000SamplingRate);
     mMsdOutputDevice->addAudioProfile(pcmOutputProfile);
     mMsdOutputDevice->addAudioProfile(ac3OutputProfile);
     mMsdOutputDevice->addAudioProfile(iec958OutputProfile);
@@ -519,7 +519,7 @@
     // Add HDMI input device with IEC60958 profile for HDMI in -> MSD patching.
     mHdmiInputDevice = new DeviceDescriptor(AUDIO_DEVICE_IN_HDMI);
     sp<AudioProfile> iec958InputProfile = new AudioProfile(
-            AUDIO_FORMAT_IEC60958, AUDIO_CHANNEL_IN_STEREO, k48000SamplingRate);
+            AUDIO_FORMAT_IEC60958, AUDIO_CHANNEL_INDEX_MASK_24, k48000SamplingRate);
     mHdmiInputDevice->addAudioProfile(iec958InputProfile);
     config.addDevice(mHdmiInputDevice);
     sp<InputProfile> hdmiInputProfile = new InputProfile("hdmi input");
@@ -677,8 +677,8 @@
     ASSERT_EQ(AUDIO_PORT_ROLE_SINK, patch->mPatch.sinks[0].role);
     ASSERT_EQ(AUDIO_FORMAT_IEC60958, patch->mPatch.sources[0].format);
     ASSERT_EQ(AUDIO_FORMAT_IEC60958, patch->mPatch.sinks[0].format);
-    ASSERT_EQ(AUDIO_CHANNEL_IN_STEREO, patch->mPatch.sources[0].channel_mask);
-    ASSERT_EQ(AUDIO_CHANNEL_OUT_STEREO, patch->mPatch.sinks[0].channel_mask);
+    ASSERT_EQ(AUDIO_CHANNEL_INDEX_MASK_24, patch->mPatch.sources[0].channel_mask);
+    ASSERT_EQ(AUDIO_CHANNEL_INDEX_MASK_24, patch->mPatch.sinks[0].channel_mask);
     ASSERT_EQ(k48000SamplingRate, patch->mPatch.sources[0].sample_rate);
     ASSERT_EQ(k48000SamplingRate, patch->mPatch.sinks[0].sample_rate);
     ASSERT_EQ(1, patchCount.deltaFromSnapshot());
@@ -754,7 +754,7 @@
     audio_config_base_t msdDirectConfig2 = AUDIO_CONFIG_BASE_INITIALIZER;
     msdDirectConfig2.format = AUDIO_FORMAT_IEC60958;
     msdDirectConfig2.sample_rate = 48000;
-    msdDirectConfig2.channel_mask = AUDIO_CHANNEL_OUT_STEREO;
+    msdDirectConfig2.channel_mask = AUDIO_CHANNEL_INDEX_MASK_24;
 
     audio_config_base_t msdNonDirectConfig = AUDIO_CONFIG_BASE_INITIALIZER;
     msdNonDirectConfig.format = AUDIO_FORMAT_PCM_16_BIT;
@@ -821,7 +821,7 @@
     audio_config_t msdDirectConfig2 = AUDIO_CONFIG_INITIALIZER;
     msdDirectConfig2.format = AUDIO_FORMAT_IEC60958;
     msdDirectConfig2.sample_rate = 48000;
-    msdDirectConfig2.channel_mask = AUDIO_CHANNEL_OUT_STEREO;
+    msdDirectConfig2.channel_mask = AUDIO_CHANNEL_INDEX_MASK_24;
 
     audio_config_t msdNonDirectConfig = AUDIO_CONFIG_INITIALIZER;
     msdNonDirectConfig.format = AUDIO_FORMAT_PCM_16_BIT;