use tolerance to bail out early from rate control : much faster

diff --git a/src/lib/openjp2/tcd.c b/src/lib/openjp2/tcd.c
index 13d6692bd9a89402fba723caf5461463fa2d903b..b3e789e3353602f8347c76e323b400356c5f69b1 100644 (file)
--- a/src/lib/openjp2/tcd.c
+++ b/src/lib/openjp2/tcd.c
@@ -539,6 +539,8 @@ OPJ_BOOL opj_tcd_rateallocate(opj_tcd_t *tcd,
                                 OPJ_UINT32) ceil(tcd_tcp->rates[layno])), len) : len;
         OPJ_FLOAT64 goodthresh = 0;
         OPJ_FLOAT64 stable_thresh = 0;
+               OPJ_FLOAT64 old_thresh = -1;
+               const OPJ_FLOAT64 tolerance = 0.01;
         OPJ_UINT32 i;
         OPJ_FLOAT64 distotarget;                /* fixed_quality */
 
@@ -567,6 +569,9 @@ OPJ_BOOL opj_tcd_rateallocate(opj_tcd_t *tcd,
                 thresh = (lo + hi) / 2;
 
                 opj_tcd_makelayer(tcd, layno, thresh, 0);
+                               if ((fabs(old_thresh - thresh)) < tolerance)
+                                       break;
+                               old_thresh = thresh;
 
                 if (cp->m_specific_param.m_enc.m_fixed_quality) {       /* fixed_quality */
                     if (OPJ_IS_CINEMA(cp->rsiz)) {