Document AudioMixer hard-coded limits
Change-Id: I83ea8bed375f251260945db788bdb5f280dba12d
diff --git a/services/audioflinger/AudioMixer.h b/services/audioflinger/AudioMixer.h
index dc468ff..e60a298 100644
--- a/services/audioflinger/AudioMixer.h
+++ b/services/audioflinger/AudioMixer.h
@@ -41,8 +41,15 @@
/*virtual*/ ~AudioMixer(); // non-virtual saves a v-table, restore if sub-classed
+
+ // This mixer has a hard-coded upper limit of 32 active track inputs.
+ // Adding support for > 32 tracks would require more than simply changing this value.
static const uint32_t MAX_NUM_TRACKS = 32;
// maximum number of channels supported by the mixer
+
+ // This mixer has a hard-coded upper limit of 2 channels for output.
+ // There is support for > 2 channel tracks down-mixed to 2 channel output via a down-mix effect.
+ // Adding support for > 2 channel output would require more than simply changing this value.
static const uint32_t MAX_NUM_CHANNELS = 2;
// maximum number of channels supported for the content
static const uint32_t MAX_NUM_CHANNELS_TO_DOWNMIX = 8;