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author | Michael Niedermayer <michaelni@gmx.at> | 2003-12-12 19:26:55 +0000 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2003-12-12 19:26:55 +0000 |
commit | fb0666392c0f90eeed96ff39d19ff19554e22ffc (patch) | |
tree | 8827fa2362f28635719c551aba4705ce7161a71b /libavcodec/ratecontrol.c | |
parent | 7a0f9d7e7d03ec7af11f77d474323fedbaa82368 (diff) | |
download | ffmpeg-streaming-fb0666392c0f90eeed96ff39d19ff19554e22ffc.zip ffmpeg-streaming-fb0666392c0f90eeed96ff39d19ff19554e22ffc.tar.gz |
CBR improvements
Originally committed as revision 2601 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/ratecontrol.c')
-rw-r--r-- | libavcodec/ratecontrol.c | 36 |
1 files changed, 20 insertions, 16 deletions
diff --git a/libavcodec/ratecontrol.c b/libavcodec/ratecontrol.c index be2899e..d86c5ae 100644 --- a/libavcodec/ratecontrol.c +++ b/libavcodec/ratecontrol.c @@ -1,7 +1,7 @@ /* * Rate control for video encoders * - * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> + * Copyright (c) 2002-2003 Michael Niedermayer <michaelni@gmx.at> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -62,7 +62,7 @@ int ff_rate_control_init(MpegEncContext *s) rcc->frame_count[i]= 1; // 1 is better cuz of 1/0 and such rcc->last_qscale_for[i]=FF_QP2LAMBDA * 5; } - rcc->buffer_index= s->avctx->rc_buffer_size/2; + rcc->buffer_index= s->avctx->rc_initial_buffer_occupancy; if(s->flags&CODEC_FLAG_PASS2){ int i; @@ -202,20 +202,23 @@ static void update_rc_buffer(MpegEncContext *s, int frame_size){ const double min_rate= s->avctx->rc_min_rate/fps; const double max_rate= s->avctx->rc_max_rate/fps; +//printf("%f %f %d %f %f\n", buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate); if(buffer_size){ + int left; + rcc->buffer_index-= frame_size; - if(rcc->buffer_index < buffer_size/2 /*FIXME /2 */ || min_rate==0){ - rcc->buffer_index+= max_rate; - if(rcc->buffer_index >= buffer_size) - rcc->buffer_index= buffer_size-1; - }else{ - rcc->buffer_index+= min_rate; - } - - if(rcc->buffer_index < 0) + if(rcc->buffer_index < 0){ av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n"); - if(rcc->buffer_index >= s->avctx->rc_buffer_size) + rcc->buffer_index= 0; + } + + left= buffer_size - rcc->buffer_index - 1; + rcc->buffer_index += clip(left, min_rate, max_rate); + + if(rcc->buffer_index > s->avctx->rc_buffer_size){ av_log(s->avctx, AV_LOG_ERROR, "rc buffer overflow\n"); + rcc->buffer_index= s->avctx->rc_buffer_size; + } } } @@ -385,8 +388,9 @@ static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, double bits; const int pict_type= rce->new_pict_type; const double buffer_size= s->avctx->rc_buffer_size; - const double min_rate= s->avctx->rc_min_rate; - const double max_rate= s->avctx->rc_max_rate; + const double fps= (double)s->avctx->frame_rate / (double)s->avctx->frame_rate_base; + const double min_rate= s->avctx->rc_min_rate / fps; + const double max_rate= s->avctx->rc_max_rate / fps; get_qminmax(&qmin, &qmax, s, pict_type); @@ -406,7 +410,7 @@ static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, else if(d<0.0001) d=0.0001; q*= pow(d, 1.0/s->avctx->rc_buffer_aggressivity); - q= FFMIN(q, bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*2, 1))); + q= FFMIN(q, bits2qp(rce, FFMAX((min_rate - buffer_size + rcc->buffer_index)*3, 1))); } if(max_rate){ @@ -415,7 +419,7 @@ static double modify_qscale(MpegEncContext *s, RateControlEntry *rce, double q, else if(d<0.0001) d=0.0001; q/= pow(d, 1.0/s->avctx->rc_buffer_aggressivity); - q= FFMAX(q, bits2qp(rce, FFMAX(rcc->buffer_index/2, 1))); + q= FFMAX(q, bits2qp(rce, FFMAX(rcc->buffer_index/3, 1))); } } //printf("q:%f max:%f min:%f size:%f index:%d bits:%f agr:%f\n", q,max_rate, min_rate, buffer_size, rcc->buffer_index, bits, s->avctx->rc_buffer_aggressivity); |