Have voice fire an event when it starts and stops playing.

Further decouples voice_thread.c from other playback areas. Also allows
other audio sources, such as FM radio, to be attenuated when voice is
playing by implementing a callback.

Defined as another playback event rather than a new event class:
PLAYBACK_EVENT_VOICE_PLAYING

Change-Id: I2e3e218be6cd6bebbf39e7883a8c0e4ed42b62bb

1 files changed, 2 insertions, 0 deletions

diff --git a/apps/appevents.h b/apps/appevents.h
index a11e423a90..506f00329b 100644
--- a/apps/appevents.h
+++ b/apps/appevents.h
@@ -45,6 +45,8 @@ enum {
     PLAYBACK_EVENT_TRACK_SKIP,
     /* Next track medadata was just loaded */
     PLAYBACK_EVENT_NEXTTRACKID3_AVAILABLE,
+    /* Voice is playing: data = &(bool){true|false} */
+    PLAYBACK_EVENT_VOICE_PLAYING,
 };
 
 /** Buffering events **/