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opus: granule positions are 48KHz

--- a/opus.c

+++ b/opus.c

@@ -80,7 +80,7 @@

 				v = memchr(v, 'O', ctx->buf+sz - v - 14);

 				if(v != nil && v[1] == 'g' && v[2] == 'g' && v[3] == 'S' && (v[5] & 4) == 4){ /* last page */

 					uvlong g = leuint(v+6) | (uvlong)leuint(v+10)<<32;

-					ctx->duration = g * 1000 / ctx->samplerate;

+					ctx->duration = g * 1000 / 48000; /* granule positions are always 48KHz */

 					return 0;

 				}

 				if(v != nil)