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Modify initial value for avg_frame_qindex

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In high bitdepth mode there is an extended quantizer range.
This means that it takes longer for the avg_frame_qindex
to ramp up and this results in coding loss for short
low bitrate sequences.

This patch adds a boost in high bitdepth mode to compensate
for this effect.

This helps with the bowing_cif.y4m sequence at 50kbps.

Change-Id: Ie1575d88e8de4f0297cf86da50eb36dfc5442c70
This commit is contained in:
Peter de Rivaz
2014-07-02 14:37:11 +01:00
parent 225c60848b
commit 3cd669c548
1 changed files with 20 additions and 0 deletions
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20
vp9/encoder/vp9_ratectrl.c
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@@ -268,6 +268,26 @@ void vp9_rc_init(const VP9EncoderConfig *oxcf, int pass, RATE_CONTROL *rc) {
oxcf->best_allowed_q) / 2;
rc->avg_frame_qindex[INTER_FRAME] = (oxcf->worst_allowed_q +
oxcf->best_allowed_q) / 2;
#if CONFIG_VP9_HIGH && CONFIG_HIGH_TRANSFORMS && CONFIG_HIGH_QUANT
switch (oxcf->bit_depth) {
case VPX_BITS_8:
break;
case VPX_BITS_10:
rc->avg_frame_qindex[KEY_FRAME] += (MAXQ_10 - MAXQ) / 2;
rc->avg_frame_qindex[INTER_FRAME] += (MAXQ_10 - MAXQ) / 2;
break;
case VPX_BITS_12:
rc->avg_frame_qindex[KEY_FRAME] += (MAXQ_12 - MAXQ) / 2;
rc->avg_frame_qindex[INTER_FRAME] += (MAXQ_12 - MAXQ) / 2;
break;
default:
assert(0 && "bit_depth should be VPX_BITS_8, VPX_BITS_10, VPX_BITS_12");
}
if (rc->avg_frame_qindex[KEY_FRAME] > oxcf->worst_allowed_q)
rc->avg_frame_qindex[KEY_FRAME] = oxcf->worst_allowed_q;
if (rc->avg_frame_qindex[INTER_FRAME] > oxcf->worst_allowed_q)
rc->avg_frame_qindex[INTER_FRAME] = oxcf->worst_allowed_q;
#endif
}
rc->last_q[KEY_FRAME] = oxcf->best_allowed_q;