diff options
Diffstat (limited to 'vp8/encoder/firstpass.c')
| -rw-r--r-- | vp8/encoder/firstpass.c | 103 |
1 files changed, 73 insertions, 30 deletions
diff --git a/vp8/encoder/firstpass.c b/vp8/encoder/firstpass.c index 348419c0b..c47265548 100644 --- a/vp8/encoder/firstpass.c +++ b/vp8/encoder/firstpass.c @@ -1316,6 +1316,43 @@ void vp8_end_second_pass(VP8_COMP *cpi) { } +// This function gives and estimate of how badly we believe +// the predicition quality is decaying from frame to frame. +double gf_prediction_decay_rate(VP8_COMP *cpi, FIRSTPASS_STATS *next_frame) +{ + double prediction_decay_rate; + double motion_decay; + double motion_pct = next_frame->pcnt_motion; + + + // Initial basis is the % mbs inter coded + prediction_decay_rate = next_frame->pcnt_inter; + + // High % motion -> somewhat higher decay rate + motion_decay = (1.0 - (motion_pct / 20.0)); + if (motion_decay < prediction_decay_rate) + prediction_decay_rate = motion_decay; + + // Adjustment to decay rate based on speed of motion + { + double this_mv_rabs; + double this_mv_cabs; + double distance_factor; + + this_mv_rabs = fabs(next_frame->mvr_abs * motion_pct); + this_mv_cabs = fabs(next_frame->mvc_abs * motion_pct); + + distance_factor = sqrt((this_mv_rabs * this_mv_rabs) + + (this_mv_cabs * this_mv_cabs)) / 250.0; + distance_factor = ((distance_factor > 1.0) + ? 0.0 : (1.0 - distance_factor)); + if (distance_factor < prediction_decay_rate) + prediction_decay_rate = distance_factor; + } + + return prediction_decay_rate; +} + // Analyse and define a gf/arf group . static void define_gf_group(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame) { @@ -1468,36 +1505,11 @@ static void define_gf_group(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame) if (r > GF_RMAX) r = GF_RMAX; - // Adjust loop decay rate - //if ( next_frame.pcnt_inter < loop_decay_rate ) - loop_decay_rate = next_frame.pcnt_inter; - - // High % motion -> somewhat higher decay rate - motion_decay = (1.0 - (motion_pct / 20.0)); - if (motion_decay < loop_decay_rate) - loop_decay_rate = motion_decay; - - // Adjustment to decay rate based on speed of motion - { - double this_mv_rabs; - double this_mv_cabs; - double distance_factor; - - this_mv_rabs = fabs(next_frame.mvr_abs * motion_pct); - this_mv_cabs = fabs(next_frame.mvc_abs * motion_pct); - - distance_factor = sqrt((this_mv_rabs * this_mv_rabs) + - (this_mv_cabs * this_mv_cabs)) / 250.0; - distance_factor = ((distance_factor > 1.0) - ? 0.0 : (1.0 - distance_factor)); - if (distance_factor < loop_decay_rate) - loop_decay_rate = distance_factor; - } + loop_decay_rate = gf_prediction_decay_rate(cpi, &next_frame); // Cumulative effect of decay decay_accumulator = decay_accumulator * loop_decay_rate; decay_accumulator = decay_accumulator < 0.1 ? 0.1 : decay_accumulator; - //decay_accumulator = ( loop_decay_rate < decay_accumulator ) ? loop_decay_rate : decay_accumulator; boost_score += (decay_accumulator * r); @@ -1508,11 +1520,42 @@ static void define_gf_group(VP8_COMP *cpi, FIRSTPASS_STATS *this_frame) (loop_decay_rate >= 0.999) && (decay_accumulator < 0.9) ) { - // Force GF not alt ref - allow_alt_ref = FALSE; + int j; + FIRSTPASS_STATS * position = cpi->stats_in; + FIRSTPASS_STATS tmp_next_frame; + double decay_rate; + + // Look ahead a few frames to see if static condition + // persists... + for ( j = 0; j < 4; j++ ) + { + if (EOF == vp8_input_stats(cpi, &tmp_next_frame)) + break; - boost_score = old_boost_score; - break; + decay_rate = gf_prediction_decay_rate(cpi, &tmp_next_frame); + if ( decay_rate < 0.999 ) + break; + } + reset_fpf_position(cpi, position); // Reset file position + + // Force GF not alt ref + if ( j == 4 ) + { + if (0) + { + FILE *f = fopen("fadegf.stt", "a"); + fprintf(f, " %8d %8d %10.4f %10.4f %10.4f\n", + cpi->common.current_video_frame+i, i, + loop_decay_rate, decay_accumulator, + boost_score ); + fclose(f); + } + + allow_alt_ref = FALSE; + + boost_score = old_boost_score; + break; + } } // Break out conditions. |