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Implement intensity compensation

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Originally committed as revision 5609 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2006-07-04 15:40:09 +00:00
parent 8a66a390cc
commit 66d0ad2605
1 changed files with 42 additions and 2 deletions
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44
libavcodec/vc1.c
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@ -319,6 +319,7 @@ typedef struct VC1Context{
// BitPlane direct_mb_plane; ///< bitplane for "direct" MBs
int mv_type_is_raw; ///< mv type mb plane is not coded
int skip_is_raw; ///< skip mb plane is not coded
uint8_t luty[256], lutuv[256]; // lookup tables used for intensity compensation
/** Frame decoding info for S/M profiles only */
//@{
@ -946,7 +947,8 @@ static void vc1_mc_1mv(VC1Context *v)
srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
srcV += uvsrc_y * s->uvlinesize + uvsrc_x;
if((unsigned)src_x > s->h_edge_pos - (mx&3) - 16
if((v->mv_mode == MV_PMODE_INTENSITY_COMP)
|| (unsigned)src_x > s->h_edge_pos - (mx&3) - 16
|| (unsigned)src_y > s->v_edge_pos - (my&3) - 16){
uint8_t *uvbuf= s->edge_emu_buffer + 18 * s->linesize;
@ -959,6 +961,26 @@ static void vc1_mc_1mv(VC1Context *v)
uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);
srcU = uvbuf;
srcV = uvbuf + 16;
/* if we deal with intensity compensation we need to scale source blocks */
if(v->mv_mode == MV_PMODE_INTENSITY_COMP) {
int i, j;
uint8_t *src, *src2;
src = srcY;
for(j = 0; j < 17; j++) {
for(i = 0; i < 17; i++) src[i] = v->luty[src[i]];
src += s->linesize;
}
src = srcU; src2 = srcV;
for(j = 0; j < 9; j++) {
for(i = 0; i < 9; i++) {
src[i] = v->lutuv[src[i]];
src2[i] = v->lutuv[src2[i]];
}
src += s->uvlinesize;
src2 += s->uvlinesize;
}
}
}
if(!s->quarter_sample) { // hpel mc
@ -1325,9 +1347,27 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
v->mv_mode = mv_pmode_table[lowquant][get_prefix(gb, 1, 4)];
if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
{
v->mv_mode2 = mv_pmode_table[lowquant][get_prefix(gb, 1, 3)];
int scale, shift, i;
v->mv_mode2 = mv_pmode_table2[lowquant][get_prefix(gb, 1, 3)];
v->lumscale = get_bits(gb, 6);
v->lumshift = get_bits(gb, 6);
/* fill lookup tables for intensity compensation */
if(!v->lumscale) {
scale = -64;
shift = (255 - v->lumshift * 2) << 6;
if(v->lumshift > 31)
shift += 128 << 6;
} else {
scale = v->lumscale + 32;
if(v->lumshift > 31)
shift = (v->lumshift - 64) << 6;
else
shift = v->lumshift << 6;
}
for(i = 0; i < 256; i++) {
v->luty[i] = clip_uint8((scale * i + shift + 32) >> 6);
v->lutuv[i] = clip_uint8((scale * (i - 128) + 128*64 + 32) >> 6);
}
}
if(v->mv_mode == MV_PMODE_1MV_HPEL || v->mv_mode == MV_PMODE_1MV_HPEL_BILIN)
v->s.quarter_sample = 0;