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AC table reset (memset) optimization - patch by Michael Niedermayer <michaelni@gmx.at>

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Originally committed as revision 251 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-01-10 00:53:21 +00:00
parent 5a24083859
commit bff6ecaa9c
2 changed files with 19 additions and 1 deletions
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19
libavcodec/mpegvideo.c
View File

@ -180,6 +180,12 @@ int MPV_common_init(MpegEncContext *s)
s->coded_block = av_mallocz(y_size);
if (!s->coded_block)
goto fail;
/* which mb is a intra block */
s->mbintra_table = av_mallocz(y_size/4);
if (!s->mbintra_table)
goto fail;
memset(s->mbintra_table, 1, y_size/4);
}
/* default structure is frame */
s->picture_structure = PICT_FRAME;
@ -202,6 +208,8 @@ int MPV_common_init(MpegEncContext *s)
free(s->ac_val[0]);
if (s->coded_block)
free(s->coded_block);
if (s->mbintra_table)
free(s->mbintra_table);
if (s->mbskip_table)
free(s->mbskip_table);
for(i=0;i<3;i++) {
@ -226,6 +234,7 @@ void MPV_common_end(MpegEncContext *s)
free(s->dc_val[0]);
free(s->ac_val[0]);
free(s->coded_block);
free(s->mbintra_table);
}
if (s->mbskip_table)
free(s->mbskip_table);
@ -697,11 +706,16 @@ void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
/* update DC predictors for P macroblocks */
if (!s->mb_intra) {
if (s->h263_pred) {
if(s->mbintra_table[mb_x + mb_y*s->mb_width])
{
int wrap, x, y, v;
s->mbintra_table[mb_x + mb_y*s->mb_width]=0;
wrap = 2 * s->mb_width + 2;
v = 1024;
x = 2 * mb_x + 1;
y = 2 * mb_y + 1;
s->dc_val[0][(x) + (y) * wrap] = v;
s->dc_val[0][(x + 1) + (y) * wrap] = v;
s->dc_val[0][(x) + (y + 1) * wrap] = v;
@ -726,13 +740,16 @@ void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
/* ac pred */
memset(s->ac_val[1][(x) + (y) * wrap], 0, 16 * sizeof(INT16));
memset(s->ac_val[2][(x) + (y) * wrap], 0, 16 * sizeof(INT16));
}
} else {
s->last_dc[0] = 128 << s->intra_dc_precision;
s->last_dc[1] = 128 << s->intra_dc_precision;
s->last_dc[2] = 128 << s->intra_dc_precision;
}
}
else
s->mbintra_table[mb_x + mb_y*s->mb_width]=1;
/* update motion predictor */
if (s->out_format == FMT_H263) {
int x, y, wrap;

1
libavcodec/mpegvideo.h
View File

@ -75,6 +75,7 @@ typedef struct MpegEncContext {
int mb_skiped; /* MUST BE SET only during DECODING */
UINT8 *mbskip_table; /* used to avoid copy if macroblock
skipped (for black regions for example) */
UINT8 *mbintra_table; /* used to kill a few memsets */
int qscale;
int pict_type;