diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index df58909..8319dcd 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -250,9 +250,6 @@
     if (format == AUDIO_FORMAT_DEFAULT) {
         format = AUDIO_FORMAT_PCM_16_BIT;
     }
-    if (channelMask == 0) {
-        channelMask = AUDIO_CHANNEL_OUT_STEREO;
-    }
 
     // validate parameters
     if (!audio_is_valid_format(format)) {
@@ -260,6 +257,11 @@
         return BAD_VALUE;
     }
 
+    if (!audio_is_output_channel(channelMask)) {
+        ALOGE("Invalid channel mask %#x", channelMask);
+        return BAD_VALUE;
+    }
+
     // AudioFlinger does not currently support 8-bit data in shared memory
     if (format == AUDIO_FORMAT_PCM_8_BIT && sharedBuffer != 0) {
         ALOGE("8-bit data in shared memory is not supported");
@@ -282,10 +284,6 @@
         flags = (audio_output_flags_t)(flags &~AUDIO_OUTPUT_FLAG_DEEP_BUFFER);
     }
 
-    if (!audio_is_output_channel(channelMask)) {
-        ALOGE("Invalid channel mask %#x", channelMask);
-        return BAD_VALUE;
-    }
     mChannelMask = channelMask;
     uint32_t channelCount = popcount(channelMask);
     mChannelCount = channelCount;