AAC: Add a global header but output not locked output configuration status.

Originally committed as revision 20701 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/aac.c

@@ -390,7 +390,7 @@ static int decode_ga_specific_config(AACContext *ac, GetBitContext *gb,
         if ((ret = set_default_channel_config(ac, new_che_pos, channel_config)))
             return ret;
     }
-    if ((ret = output_configure(ac, ac->che_pos, new_che_pos, channel_config, OC_LOCKED)))
+    if ((ret = output_configure(ac, ac->che_pos, new_che_pos, channel_config, OC_GLOBAL_HDR)))
         return ret;
 
     if (extension_flag) {

libavcodec/aac.h

@@ -109,6 +109,7 @@ enum OCStatus {
     OC_NONE,        //< Output unconfigured
     OC_TRIAL_PCE,   //< Output configuration under trial specified by an inband PCE
     OC_TRIAL_FRAME, //< Output configuration under trial specified by a frame header
+    OC_GLOBAL_HDR,  //< Output configuration set in a global header but not yet locked
     OC_LOCKED,      //< Output configuration locked in place
 };