fix random dithering of zero-bit mantissas

Originally committed as revision 10495 to svn://svn.ffmpeg.org/ffmpeg/trunk
17 years ago · d5b7144e1f
parent bfcf690c68
commit d5b7144e1f
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@ -518,7 +518,7 @@ static int get_transform_coeffs_ch(AC3DecodeContext *ctx, int ch_index, mant_gro
        tbap = bap[i];
        switch (tbap) {
            case 0:
-                coeffs[i] = ((av_random(&ctx->dith_state) & 0xFFFF) * LEVEL_MINUS_3DB) / 32768.0f;
+                coeffs[i] = ((av_random(&ctx->dith_state) & 0xFFFF) / 65535.0f) - 0.5f;
                break;

            case 1: