generic-library/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Border processing adaptive quant patch by (Christophe Massiot |cmassiot freebox fr)

Browse Source 
Originally committed as revision 3927 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Christophe Massiot 2005-02-02 18:49:04 +00:00 committed by Michael Niedermayer
parent ebaa7e0315
commit 957c743a23
3 changed files with 34 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
libavcodec/avcodec.h
View File

@ -17,7 +17,7 @@ extern "C" {
#define FFMPEG_VERSION_INT 0x000409
#define FFMPEG_VERSION "0.4.9-pre1"
#define LIBAVCODEC_BUILD 4740
#define LIBAVCODEC_BUILD 4741
#define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
#define LIBAVCODEC_VERSION FFMPEG_VERSION
@ -1750,6 +1750,14 @@ typedef struct AVCodecContext {
* - decoding: unused
*/
int frame_skip_cmp;
/**
* border processing masking. raises the quantizer for mbs on the borders
* of the picture.
* - encoding: set by user
* - decoding: unused
*/
float border_masking;
} AVCodecContext;

1
libavcodec/mpegvideo.c
View File

@ -949,6 +949,7 @@ int MPV_encode_init(AVCodecContext *avctx)
|| s->avctx->temporal_cplx_masking
|| s->avctx->spatial_cplx_masking
|| s->avctx->p_masking
|| s->avctx->border_masking
|| (s->flags&CODEC_FLAG_QP_RD))
&& !s->fixed_qscale;

24
libavcodec/ratecontrol.c
View File

@ -501,6 +501,7 @@ static void adaptive_quantization(MpegEncContext *s, double q){
const float temp_cplx_masking= s->avctx->temporal_cplx_masking;
const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
const float p_masking = s->avctx->p_masking;
const float border_masking = s->avctx->border_masking;
float bits_sum= 0.0;
float cplx_sum= 0.0;
float cplx_tab[s->mb_num];
@ -508,6 +509,8 @@ static void adaptive_quantization(MpegEncContext *s, double q){
const int qmin= s->avctx->lmin;
const int qmax= s->avctx->lmax;
Picture * const pic= &s->current_picture;
const int mb_width = s->mb_width;
const int mb_height = s->mb_height;
for(i=0; i<s->mb_num; i++){
const int mb_xy= s->mb_index2xy[i];
@ -515,6 +518,10 @@ static void adaptive_quantization(MpegEncContext *s, double q){
float spat_cplx= sqrt(pic->mb_var[mb_xy]);
const int lumi= pic->mb_mean[mb_xy];
float bits, cplx, factor;
int mb_x = mb_xy % s->mb_stride;
int mb_y = mb_xy / s->mb_stride;
int mb_distance;
float mb_factor = 0.0;
#if 0
if(spat_cplx < q/3) spat_cplx= q/3; //FIXME finetune
if(temp_cplx < q/3) temp_cplx= q/3; //FIXME finetune
@ -536,6 +543,23 @@ static void adaptive_quantization(MpegEncContext *s, double q){
else
factor*= (1.0 - (lumi-128)*(lumi-128)*dark_masking);
if(mb_x < mb_width/5){
mb_distance = mb_width/5 - mb_x;
mb_factor = (float)mb_distance / (float)(mb_width/5);
}else if(mb_x > 4*mb_width/5){
mb_distance = mb_x - 4*mb_width/5;
mb_factor = (float)mb_distance / (float)(mb_width/5);
}
if(mb_y < mb_height/5){
mb_distance = mb_height/5 - mb_y;
mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
}else if(mb_y > 4*mb_height/5){
mb_distance = mb_y - 4*mb_height/5;
mb_factor = FFMAX(mb_factor, (float)mb_distance / (float)(mb_height/5));
}
factor*= 1.0 - border_masking*mb_factor;
if(factor<0.00001) factor= 0.00001;
bits= cplx*factor;