X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Faac.h;h=23ec085d8e029ef3ef8dc00b600d246f6980cbe6;hb=40d552dae657d2d690a724c8b1e7ea714998d74f;hp=b25b40c9c6b3135472d054d32bed2ca55ba849a0;hpb=48183f144d1d6f7af8e8526a2e020a6a88ad38c0;p=ffmpeg

diff --git a/libavcodec/aac.h b/libavcodec/aac.h
index b25b40c9c6b..23ec085d8e0 100644
--- a/libavcodec/aac.h
+++ b/libavcodec/aac.h
@@ -141,6 +141,10 @@ typedef struct PredictorState {
 #define SCALE_MAX_DIFF   60    ///< maximum scalefactor difference allowed by standard
 #define SCALE_DIFF_ZERO  60    ///< codebook index corresponding to zero scalefactor indices difference
 
+#define NOISE_PRE       256    ///< preamble for NOISE_BT, put in bitstream with the first noise band
+#define NOISE_PRE_BITS    9    ///< length of preamble
+#define NOISE_OFFSET     90    ///< subtracted from global gain, used as offset for the preamble
+
 /**
  * Long Term Prediction
  */