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| author | Jean-Marc Valin <jmvalin@jmvalin.ca> | 2016-01-04 22:35:13 -0500 |
|---|---|---|
| committer | Jean-Marc Valin <jmvalin@jmvalin.ca> | 2016-07-28 15:16:13 -0400 |
| commit | 886dc594f087284eefa4c6947da2a35eceb4cef9 (patch) | |
| tree | 2ba04968ceed3631ae38727656d5f36e011a9193 | |
| parent | 3934fac7e27dbe253f87302a034b01e40083c25f (diff) | |
| download | opus-886dc594f087284eefa4c6947da2a35eceb4cef9.tar.gz | |
controlling rounding
| -rw-r--r-- | celt/bands.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/celt/bands.c b/celt/bands.c index 36f1004e..44e9074d 100644 --- a/celt/bands.c +++ b/celt/bands.c @@ -658,6 +658,7 @@ struct band_ctx { const celt_ener *bandE; opus_uint32 seed; int arch; + int theta_round; }; struct split_ctx { @@ -715,8 +716,14 @@ static void compute_theta(struct band_ctx *ctx, struct split_ctx *sctx, if (qn!=1) { if (encode) - itheta = (itheta*(opus_int32)qn+8192)>>14; - + { + if (!stereo || ctx->theta_round == 0) + itheta = (itheta*(opus_int32)qn+8192)>>14; + else if (ctx->theta_round < 0) + itheta = (itheta*(opus_int32)qn)>>14; + else + itheta = (itheta*(opus_int32)qn+16383)>>14; + } /* Entropy coding of the angle. We use a uniform pdf for the time split, a step for stereo, and a triangular one for the rest. */ if (stereo && N>2) @@ -1482,6 +1489,7 @@ void quant_all_bands(int encode, const CELTMode *m, int start, int end, } else { if (Y!=NULL) { + ctx.theta_round = 0; x_cm = quant_band_stereo(&ctx, X, Y, N, b, B, effective_lowband != -1 ? norm+effective_lowband : NULL, LM, last?NULL:norm+M*eBands[i]-norm_offset, lowband_scratch, x_cm|y_cm); |