commit dce0eca34eab2016d6d11cb32f072db4079a4461
author Andy Hung <hunga@google.com> Mon Sep 28 16:31:54 2015 -0700
committer Andy Hung <hunga@google.com> Thu Oct 01 20:20:37 2015 +0000
tree 4f11bda7c05d098b440e3e99299938bd002d8ab5
parent 2d950898d4dc311ecfd2b64ea8880656dd6a14fa

fix usb audio for devices with more than 8 channels

Use the lowest 8 channels.

Bug: 24468939
Change-Id: If116133ab3c902cc6d431b287058897c8e3af875
(cherry picked from commit 67c63b290460f36f7841d6f01017bb116a2a36f1)

alsa_utils/alsa_device_profile.c

diff --git a/alsa_utils/alsa_device_profile.c b/alsa_utils/alsa_device_profile.c
index dd238e7..054c77a 100644
--- a/alsa_utils/alsa_device_profile.c
+++ b/alsa_utils/alsa_device_profile.c
@@ -288,6 +288,12 @@
             profile->channel_counts[num_counts++] = std_channel_counts[index];
         }
     }
+    // if we have no match with the standard counts, we use the largest (preferred) std count.
+    if (num_counts == 0) {
+        ALOGW("usb device does not match std channel counts, setting to %d",
+                std_channel_counts[0]);
+        profile->channel_counts[num_counts++] = std_channel_counts[0];
+    }
     profile->channel_counts[num_counts] = 0;
     return num_counts; /* return # of supported counts */
 }