aac: define a new profile for USAC

This allows users to determine whether a stream is USAC or not.

libavcodec/aac/aacdec_usac.c

@@ -494,6 +494,8 @@ int ff_aac_usac_config_decode(AACDecContext *ac, AVCodecContext *avctx,
         }
     }
 
+    ac->avctx->profile = AV_PROFILE_AAC_USAC;
+
     ret = ff_aac_usac_reset_state(ac, oc);
     if (ret < 0)
         return ret;
@@ -1533,6 +1535,8 @@ int ff_aac_usac_decode_frame(AVCodecContext *avctx, AACDecContext *ac,
     ff_aac_output_configure(ac, ac->oc[1].layout_map, ac->oc[1].layout_map_tags,
                             ac->oc[1].status, 0);
 
+    ac->avctx->profile = AV_PROFILE_AAC_USAC;
+
     indep_flag = get_bits1(gb);
 
     nb_ch_el = 0;

libavcodec/defs.h

@@ -73,6 +73,7 @@
 #define AV_PROFILE_AAC_HE_V2       28
 #define AV_PROFILE_AAC_LD          22
 #define AV_PROFILE_AAC_ELD         38
+#define AV_PROFILE_AAC_USAC        41
 #define AV_PROFILE_MPEG2_AAC_LOW  128
 #define AV_PROFILE_MPEG2_AAC_HE   131
 

libavcodec/profiles.c

@@ -33,6 +33,7 @@ const AVProfile ff_aac_profiles[] = {
     { AV_PROFILE_AAC_MAIN,  "Main" },
     { AV_PROFILE_AAC_SSR,   "SSR"  },
     { AV_PROFILE_AAC_LTP,   "LTP"  },
+    { AV_PROFILE_AAC_USAC,  "xHE-AAC" },
     { AV_PROFILE_UNKNOWN },
 };
 

libavcodec/profiles.h

@@ -35,6 +35,7 @@
     FF_AVCTX_PROFILE_OPTION("aac_he_v2",     NULL, AUDIO, AV_PROFILE_AAC_HE_V2)\
     FF_AVCTX_PROFILE_OPTION("aac_ld",        NULL, AUDIO, AV_PROFILE_AAC_LD)\
     FF_AVCTX_PROFILE_OPTION("aac_eld",       NULL, AUDIO, AV_PROFILE_AAC_ELD)\
+    FF_AVCTX_PROFILE_OPTION("aac_xhe",       NULL, AUDIO, AV_PROFILE_AAC_USAC)\
     FF_AVCTX_PROFILE_OPTION("mpeg2_aac_low", NULL, AUDIO, AV_PROFILE_MPEG2_AAC_LOW)\
     FF_AVCTX_PROFILE_OPTION("mpeg2_aac_he",  NULL, AUDIO, AV_PROFILE_MPEG2_AAC_HE)\