Commit 59618a5f authored by Jean-Marc Valin's avatar Jean-Marc Valin

Quality: removes VBR attenuation at low bitrate

Turns out that even low bitrates benefit from VBR
parent c1acbe08
......@@ -1279,21 +1279,11 @@ static int compute_vbr(const CELTMode *mode, AnalysisInfo *analysis, opus_int32
/*printf("%f %d\n", maxDepth, floor_depth);*/
}
if ((!has_surround_mask||lfe) && (constrained_vbr || bitrate<64000))
/* Make VBR less aggressive for constrained VBR because we can't keep a higher bitrate
for long. Needs tuning. */
if ((!has_surround_mask||lfe) && constrained_vbr)
{
opus_val16 rate_factor = Q15ONE;
if (bitrate < 64000)
{
#ifdef FIXED_POINT
rate_factor = MAX16(0,(bitrate-32000));
#else
rate_factor = MAX16(0,(1.f/32768)*(bitrate-32000));
#endif
}
if (constrained_vbr)
rate_factor = MIN16(rate_factor, QCONST16(0.67f, 15));
target = base_target + (opus_int32)MULT16_32_Q15(rate_factor, target-base_target);
target = base_target + (opus_int32)MULT16_32_Q15(QCONST16(0.67f, 15), target-base_target);
}
if (!has_surround_mask && tf_estimate < QCONST16(.2f, 14))
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment