@@ -40,6 +40,11 @@ void swri_get_dither(void *dst, int len, unsigned seed, enum AVSampleFormat out_

         switch(method){

             case SWR_DITHER_RECTANGULAR: v= ((double)seed) / UINT_MAX - 0.5; break;

+            case SWR_DITHER_TRIANGULAR :

+                v = ((double)seed) / UINT_MAX;

+                seed = seed*1664525 + 1013904223;

+                v-= ((double)seed) / UINT_MAX;

+                break;

             default: av_assert0(0);

         }

@@ -55,6 +55,7 @@ static const AVOption options[]={

 {"res", "force resampling", 0, AV_OPT_TYPE_CONST, {.dbl=SWR_FLAG_RESAMPLE}, INT_MIN, INT_MAX, 0, "flags"},

 {"dither", "dither method"      , OFFSET(dither_method), AV_OPT_TYPE_INT, {.dbl=0}, 0, SWR_DITHER_NB-1, 0, "dither_method"},

 {"rectangular", "rectangular dither", 0, AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_RECTANGULAR}, INT_MIN, INT_MAX, 0, "dither_method"},

+{"triangular" , "triangular dither" , 0, AV_OPT_TYPE_CONST, {.dbl=SWR_DITHER_TRIANGULAR }, INT_MIN, INT_MAX, 0, "dither_method"},

 {0}

 };

@@ -48,6 +48,7 @@

 enum SwrDitherType {

     SWR_DITHER_NONE = 0,

     SWR_DITHER_RECTANGULAR,

+    SWR_DITHER_TRIANGULAR,

     SWR_DITHER_NB,              ///< not part of API/ABI

 };