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Code Issues Releases Activity

motion estimation for SVQ1

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Originally committed as revision 3126 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-05-12 02:03:24 +00:00
parent caa50878f4
commit 5e13a73006
4 changed files with 201 additions and 86 deletions
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47
libavcodec/h263.c
View File

@ -56,7 +56,6 @@
#ifdef CONFIG_ENCODERS
static void h263_encode_block(MpegEncContext * s, DCTELEM * block,
int n);
static void h263_encode_motion(MpegEncContext * s, int val, int fcode);
static void h263p_encode_umotion(MpegEncContext * s, int val);
static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block,
int n, int dc, uint8_t *scan_table,
@ -851,23 +850,23 @@ void mpeg4_encode_mb(MpegEncContext * s,
if(mb_type == 0){
assert(s->mv_dir & MV_DIRECT);
h263_encode_motion(s, motion_x, 1);
h263_encode_motion(s, motion_y, 1);
ff_h263_encode_motion(s, motion_x, 1);
ff_h263_encode_motion(s, motion_y, 1);
s->b_count++;
s->f_count++;
}else{
assert(mb_type > 0 && mb_type < 4);
if(s->mv_type != MV_TYPE_FIELD){
if(s->mv_dir & MV_DIR_FORWARD){
h263_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
h263_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
ff_h263_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
ff_h263_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
s->last_mv[0][0][0]= s->last_mv[0][1][0]= s->mv[0][0][0];
s->last_mv[0][0][1]= s->last_mv[0][1][1]= s->mv[0][0][1];
s->f_count++;
}
if(s->mv_dir & MV_DIR_BACKWARD){
h263_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
h263_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
ff_h263_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
ff_h263_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
s->last_mv[1][0][0]= s->last_mv[1][1][0]= s->mv[1][0][0];
s->last_mv[1][0][1]= s->last_mv[1][1][1]= s->mv[1][0][1];
s->b_count++;
@ -883,8 +882,8 @@ void mpeg4_encode_mb(MpegEncContext * s,
}
if(s->mv_dir & MV_DIR_FORWARD){
for(i=0; i<2; i++){
h263_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code);
h263_encode_motion(s, s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
ff_h263_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code);
ff_h263_encode_motion(s, s->mv[0][i][1] - s->last_mv[0][i][1]/2, s->f_code);
s->last_mv[0][i][0]= s->mv[0][i][0];
s->last_mv[0][i][1]= s->mv[0][i][1]*2;
}
@ -892,8 +891,8 @@ void mpeg4_encode_mb(MpegEncContext * s,
}
if(s->mv_dir & MV_DIR_BACKWARD){
for(i=0; i<2; i++){
h263_encode_motion(s, s->mv[1][i][0] - s->last_mv[1][i][0] , s->b_code);
h263_encode_motion(s, s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
ff_h263_encode_motion(s, s->mv[1][i][0] - s->last_mv[1][i][0] , s->b_code);
ff_h263_encode_motion(s, s->mv[1][i][1] - s->last_mv[1][i][1]/2, s->b_code);
s->last_mv[1][i][0]= s->mv[1][i][0];
s->last_mv[1][i][1]= s->mv[1][i][1]*2;
}
@ -993,8 +992,8 @@ void mpeg4_encode_mb(MpegEncContext * s,
/* motion vectors: 16x16 mode */
h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
h263_encode_motion(s, motion_x - pred_x, s->f_code);
h263_encode_motion(s, motion_y - pred_y, s->f_code);
ff_h263_encode_motion(s, motion_x - pred_x, s->f_code);
ff_h263_encode_motion(s, motion_y - pred_y, s->f_code);
}else if(s->mv_type==MV_TYPE_FIELD){
if(s->dquant) cbpc+= 8;
put_bits(&s->pb,
@ -1021,10 +1020,10 @@ void mpeg4_encode_mb(MpegEncContext * s,
put_bits(&s->pb, 1, s->field_select[0][0]);
put_bits(&s->pb, 1, s->field_select[0][1]);
h263_encode_motion(s, s->mv[0][0][0] - pred_x, s->f_code);
h263_encode_motion(s, s->mv[0][0][1] - pred_y, s->f_code);
h263_encode_motion(s, s->mv[0][1][0] - pred_x, s->f_code);
h263_encode_motion(s, s->mv[0][1][1] - pred_y, s->f_code);
ff_h263_encode_motion(s, s->mv[0][0][0] - pred_x, s->f_code);
ff_h263_encode_motion(s, s->mv[0][0][1] - pred_y, s->f_code);
ff_h263_encode_motion(s, s->mv[0][1][0] - pred_x, s->f_code);
ff_h263_encode_motion(s, s->mv[0][1][1] - pred_y, s->f_code);
}else{
assert(s->mv_type==MV_TYPE_8X8);
put_bits(&s->pb,
@ -1045,8 +1044,8 @@ void mpeg4_encode_mb(MpegEncContext * s,
/* motion vectors: 8x8 mode*/
h263_pred_motion(s, i, 0, &pred_x, &pred_y);
h263_encode_motion(s, s->current_picture.motion_val[0][ s->block_index[i] ][0] - pred_x, s->f_code);
h263_encode_motion(s, s->current_picture.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
ff_h263_encode_motion(s, s->current_picture.motion_val[0][ s->block_index[i] ][0] - pred_x, s->f_code);
ff_h263_encode_motion(s, s->current_picture.motion_val[0][ s->block_index[i] ][1] - pred_y, s->f_code);
}
}
@ -1186,8 +1185,8 @@ void h263_encode_mb(MpegEncContext * s,
h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
if (!s->umvplus) {
h263_encode_motion(s, motion_x - pred_x, 1);
h263_encode_motion(s, motion_y - pred_y, 1);
ff_h263_encode_motion(s, motion_x - pred_x, 1);
ff_h263_encode_motion(s, motion_y - pred_y, 1);
}
else {
h263p_encode_umotion(s, motion_x - pred_x);
@ -1215,8 +1214,8 @@ void h263_encode_mb(MpegEncContext * s,
motion_x= s->current_picture.motion_val[0][ s->block_index[i] ][0];
motion_y= s->current_picture.motion_val[0][ s->block_index[i] ][1];
if (!s->umvplus) {
h263_encode_motion(s, motion_x - pred_x, 1);
h263_encode_motion(s, motion_y - pred_y, 1);
ff_h263_encode_motion(s, motion_x - pred_x, 1);
ff_h263_encode_motion(s, motion_y - pred_y, 1);
}
else {
h263p_encode_umotion(s, motion_x - pred_x);
@ -1619,7 +1618,7 @@ int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,
}
#ifdef CONFIG_ENCODERS
static void h263_encode_motion(MpegEncContext * s, int val, int f_code)
void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code)
{
int range, l, bit_size, sign, code, bits;

1
libavcodec/mpegvideo.h
View File

@ -903,6 +903,7 @@ int ff_h263_resync(MpegEncContext *s);
int ff_h263_get_gob_height(MpegEncContext *s);
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
inline int ff_h263_round_chroma(int x);
void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
/* rv10.c */

217
libavcodec/svq1.c
View File

@ -48,6 +48,8 @@
#undef NDEBUG
#include <assert.h>
extern const uint8_t mvtab[33][2];
static VLC svq1_block_type;
static VLC svq1_motion_component;
static VLC svq1_intra_multistage[6];
@ -55,15 +57,13 @@ static VLC svq1_inter_multistage[6];
static VLC svq1_intra_mean;
static VLC svq1_inter_mean;
#define MEDIAN(a,b,c) (((a < b) != (b >= c)) ? b : (((a < c) != (c > b)) ? c : a))
#define SVQ1_BLOCK_SKIP 0
#define SVQ1_BLOCK_INTER 1
#define SVQ1_BLOCK_INTER_4V 2
#define SVQ1_BLOCK_INTRA 3
typedef struct SVQ1Context {
MpegEncContext m; // needed for motion estimation, should not be used for anything else, the idea is to make the motion estimation eventually independant of MpegEncContext, so this will be removed then (FIXME/XXX)
AVCodecContext *avctx;
DSPContext dsp;
AVFrame picture;
@ -86,6 +86,11 @@ typedef struct SVQ1Context {
int c_block_height;
unsigned char *c_plane;
uint16_t *mb_type;
uint32_t *dummy;
int16_t (*motion_val8[3])[2];
int16_t (*motion_val16[3])[2];
int64_t rd_total;
} SVQ1Context;
@ -349,13 +354,18 @@ static int svq1_decode_motion_vector (GetBitContext *bitbuf, svq1_pmv_t *mv, svq
for (i=0; i < 2; i++) {
/* get motion code */
diff = get_vlc2(bitbuf, svq1_motion_component.table, 7, 2) - 32;
diff = get_vlc2(bitbuf, svq1_motion_component.table, 7, 2);
if(diff<0)
return -1;
else if(diff){
if(get_bits1(bitbuf)) diff= -diff;
}
/* add median of motion vector predictors and clip result */
if (i == 1)
mv->y = ((diff + MEDIAN(pmv[0]->y, pmv[1]->y, pmv[2]->y)) << 26) >> 26;
mv->y = ((diff + mid_pred(pmv[0]->y, pmv[1]->y, pmv[2]->y)) << 26) >> 26;
else
mv->x = ((diff + MEDIAN(pmv[0]->x, pmv[1]->x, pmv[2]->x)) << 26) >> 26;
mv->x = ((diff + mid_pred(pmv[0]->x, pmv[1]->x, pmv[2]->x)) << 26) >> 26;
}
return 0;
@ -834,9 +844,9 @@ static int svq1_decode_init(AVCodecContext *avctx)
&svq1_block_type_vlc[0][1], 2, 1,
&svq1_block_type_vlc[0][0], 2, 1);
init_vlc(&svq1_motion_component, 7, 65,
&svq1_motion_component_vlc[0][1], 2, 1,
&svq1_motion_component_vlc[0][0], 2, 1);
init_vlc(&svq1_motion_component, 7, 33,
&mvtab[0][1], 2, 1,
&mvtab[0][0], 2, 1);
for (i = 0; i < 6; i++) {
init_vlc(&svq1_intra_multistage[i], 3, 8,
@ -1461,7 +1471,7 @@ static int encode_block(SVQ1Context *s, uint8_t *src, uint8_t *ref, uint8_t *dec
return best_score;
}
static void svq1_encode_plane(SVQ1Context *s, unsigned char *src_plane, unsigned char *ref_plane, unsigned char *decoded_plane,
static void svq1_encode_plane(SVQ1Context *s, int plane, unsigned char *src_plane, unsigned char *ref_plane, unsigned char *decoded_plane,
int width, int height, int src_stride, int stride)
{
unsigned char buffer0[256];
@ -1493,6 +1503,75 @@ av_log(s->avctx, AV_LOG_INFO, "********* frame #%d\n", frame++);
block_width = (width + 15) / 16;
block_height = (height + 15) / 16;
if(s->picture.pict_type == P_TYPE){
s->m.avctx= s->avctx;
s->m.current_picture_ptr= &s->m.current_picture;
s->m.last_picture_ptr = &s->m.last_picture;
s->m.last_picture.data[0]= ref_plane;
s->m.linesize=
s->m.last_picture.linesize[0]=
s->m.new_picture.linesize[0]=
s->m.current_picture.linesize[0]= stride;
s->m.width= width;
s->m.height= height;
s->m.mb_width= block_width;
s->m.mb_height= block_height;
s->m.mb_stride= s->m.mb_width+1;
s->m.b8_stride= 2*s->m.mb_width+1;
s->m.f_code=1;
s->m.pict_type= s->picture.pict_type;
s->m.qscale= s->picture.quality/FF_QP2LAMBDA;
s->m.me_method= s->avctx->me_method;
if(!s->motion_val8[plane]){
s->motion_val8 [plane]= av_mallocz(s->m.b8_stride*block_height*2*2*sizeof(int16_t));
s->motion_val16[plane]= av_mallocz(s->m.mb_stride*block_height*2*sizeof(int16_t));
}
s->m.mb_type= s->mb_type;
//dummies, to avoid segfaults
s->m.current_picture.mb_mean= s->dummy;
s->m.current_picture.mb_var= s->dummy;
s->m.current_picture.mc_mb_var= s->dummy;
s->m.current_picture.mb_type= s->dummy;
s->m.current_picture.motion_val[0]= s->motion_val8[plane];
s->m.p_mv_table= s->motion_val16[plane];
s->m.dsp= s->dsp; //move
ff_init_me(&s->m);
s->m.me.dia_size= s->avctx->dia_size;
s->m.first_slice_line=1;
for (y = 0; y < block_height; y++) {
uint8_t src[stride*16];
s->m.new_picture.data[0]= src - y*16*stride; //ugly
s->m.mb_y= y;
for(i=0; i<16 && i + 16*y<height; i++){
memcpy(&src[i*stride], &src_plane[(i+16*y)*src_stride], width);
for(x=width; x<16*block_width; x++)
src[i*stride+x]= src[i*stride+x-1];
}
for(; i<16 && i + 16*y<16*block_height; i++)
memcpy(&src[i*stride], &src[(i-1)*stride], 16*block_width);
for (x = 0; x < block_width; x++) {
s->m.mb_x= x;
ff_init_block_index(&s->m);
ff_update_block_index(&s->m);
ff_estimate_p_frame_motion(&s->m, x, y);
}
s->m.first_slice_line=0;
}
ff_fix_long_p_mvs(&s->m);
ff_fix_long_mvs(&s->m, NULL, 0, s->m.p_mv_table, s->m.f_code, CANDIDATE_MB_TYPE_INTER, 0);
}
s->m.first_slice_line=1;
for (y = 0; y < block_height; y++) {
uint8_t src[stride*16];
@ -1504,53 +1583,91 @@ av_log(s->avctx, AV_LOG_INFO, "********* frame #%d\n", frame++);
for(; i<16 && i + 16*y<16*block_height; i++)
memcpy(&src[i*stride], &src[(i-1)*stride], 16*block_width);
s->m.mb_y= y;
for (x = 0; x < block_width; x++) {
uint8_t reorder_buffer[2][6][7*32];
int count[2][6];
uint8_t reorder_buffer[3][6][7*32];
int count[3][6];
int offset = y * 16 * stride + x * 16;
uint8_t *decoded= decoded_plane + offset;
uint8_t *ref= ref_plane + offset;
int score[2]={0,0}, best;
int score[4]={0,0,0,0}, best;
uint8_t temp[16*stride];
s->m.mb_x= x;
ff_init_block_index(&s->m);
ff_update_block_index(&s->m);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "* level 5 vector @ %d, %d:\n", x * 16, y * 16);
#endif
for(i=0; i<6; i++){
init_put_bits(&s->reorder_pb[i], reorder_buffer[0][i], 7*32);
}
if(s->picture.pict_type == P_TYPE){
const uint8_t *vlc= svq1_block_type_vlc[SVQ1_BLOCK_INTRA];
put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
score[0]= vlc[1]*lambda;
}
score[0]+= encode_block(s, src+16*x, ref, temp, stride, 5, 64, lambda, 1);
for(i=0; i<6; i++){
count[0][i]= put_bits_count(&s->reorder_pb[i]);
flush_put_bits(&s->reorder_pb[i]);
init_put_bits(&s->reorder_pb[i], reorder_buffer[1][i], 7*32);
}
if(s->picture.pict_type == I_TYPE || (s->m.mb_type[x + y*s->m.mb_stride]&CANDIDATE_MB_TYPE_INTRA)){
for(i=0; i<6; i++){
init_put_bits(&s->reorder_pb[i], reorder_buffer[0][i], 7*32);
}
if(s->picture.pict_type == P_TYPE){
const uint8_t *vlc= svq1_block_type_vlc[SVQ1_BLOCK_INTRA];
put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
score[0]= vlc[1]*lambda;
}
score[0]+= encode_block(s, src+16*x, NULL, temp, stride, 5, 64, lambda, 1);
for(i=0; i<6; i++){
count[0][i]= put_bits_count(&s->reorder_pb[i]);
flush_put_bits(&s->reorder_pb[i]);
}
}else
score[0]= INT_MAX;
best=0;
if(s->picture.pict_type == P_TYPE){
const uint8_t *vlc= svq1_block_type_vlc[SVQ1_BLOCK_INTER];
put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
score[1] = vlc[1]*lambda;
for(i=0; i<2; i++){
vlc= svq1_motion_component_vlc[32];
put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
score[1] += vlc[1]*lambda;
}
int mx, my, pred_x, pred_y, dxy;
int16_t *motion_ptr;
score[1]+= encode_block(s, src+16*x, ref, decoded, stride, 5, 64, lambda, 0);
best= score[1] <= score[0];
motion_ptr= h263_pred_motion(&s->m, 0, 0, &pred_x, &pred_y);
if(s->m.mb_type[x + y*s->m.mb_stride]&CANDIDATE_MB_TYPE_INTER){
for(i=0; i<6; i++)
init_put_bits(&s->reorder_pb[i], reorder_buffer[1][i], 7*32);
put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
s->m.pb= s->reorder_pb[5];
mx= motion_ptr[0];
my= motion_ptr[1];
assert(mx>=-32 && mx<=31);
assert(my>=-32 && my<=31);
assert(pred_x>=-32 && pred_x<=31);
assert(pred_y>=-32 && pred_y<=31);
ff_h263_encode_motion(&s->m, mx - pred_x, 1);
ff_h263_encode_motion(&s->m, my - pred_y, 1);
s->reorder_pb[5]= s->m.pb;
score[1] += lambda*put_bits_count(&s->reorder_pb[5]);
dxy= (mx&1) + 2*(my&1);
s->dsp.put_pixels_tab[0][dxy](temp+16, ref + (mx>>1) + stride*(my>>1), stride, 16);
score[1]+= encode_block(s, src+16*x, temp+16, decoded, stride, 5, 64, lambda, 0);
best= score[1] <= score[0];
}
#if 0
if(skiped_score <= score[best]){
best=3;
...
}
#endif
if(best==1){
for(i=0; i<6; i++){
count[1][i]= put_bits_count(&s->reorder_pb[i]);
flush_put_bits(&s->reorder_pb[i]);
}
}else{
motion_ptr[0 ] = motion_ptr[1 ]=
motion_ptr[2 ] = motion_ptr[3 ]=
motion_ptr[0+2*s->m.b8_stride] = motion_ptr[1+2*s->m.b8_stride]=
motion_ptr[2+2*s->m.b8_stride] = motion_ptr[3+2*s->m.b8_stride]=0;
}
}else
best= 0;
}
s->rd_total += score[best];
@ -1636,6 +1753,7 @@ av_log(s->avctx, AV_LOG_INFO, " split to level %d\n", level - 1);
}
#endif
}
s->m.first_slice_line=0;
}
}
@ -1691,6 +1809,14 @@ static int svq1_encode_init(AVCodecContext *avctx)
s->c_block_width = (s->frame_width / 4 + 15) / 16;
s->c_block_height = (s->frame_height / 4 + 15) / 16;
s->avctx= avctx;
s->m.me.scratchpad= av_mallocz((avctx->width+64)*2*16*2*sizeof(uint8_t));
s->m.me.map = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
s->m.me.score_map = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
s->mb_type = av_mallocz((s->y_block_width+1)*s->y_block_height*sizeof(int16_t));
s->dummy = av_mallocz((s->y_block_width+1)*s->y_block_height*sizeof(int32_t));
h263_encode_init(&s->m); //mv_penalty
av_log(s->avctx, AV_LOG_INFO, " Hey: %d x %d, %d x %d, %d x %d\n",
s->frame_width, s->frame_height,
s->y_block_width, s->y_block_height,
@ -1746,7 +1872,7 @@ static int svq1_encode_frame(AVCodecContext *avctx, unsigned char *buf,
svq1_write_header(s, p->pict_type);
for(i=0; i<3; i++){
svq1_encode_plane(s,
svq1_encode_plane(s, i,
s->picture.data[i], s->last_picture.data[i], s->current_picture.data[i],
s->frame_width / (i?4:1), s->frame_height / (i?4:1),
s->picture.linesize[i], s->current_picture.linesize[i]);
@ -1764,10 +1890,21 @@ static int svq1_encode_frame(AVCodecContext *avctx, unsigned char *buf,
static int svq1_encode_end(AVCodecContext *avctx)
{
SVQ1Context * const s = avctx->priv_data;
int i;
av_log(avctx, AV_LOG_DEBUG, "RD: %f\n", s->rd_total/(double)(avctx->width*avctx->height*avctx->frame_number));
av_free(s->c_plane);
av_freep(&s->c_plane);
av_freep(&s->m.me.scratchpad);
av_freep(&s->m.me.map);
av_freep(&s->m.me.score_map);
av_freep(&s->mb_type);
av_freep(&s->dummy);
for(i=0; i<3; i++){
av_freep(&s->motion_val8[i]);
av_freep(&s->motion_val16[i]);
}
return 0;
}

22
libavcodec/svq1_vlc.h
View File

@ -8,28 +8,6 @@ static const uint8_t svq1_block_type_vlc[4][2] = {
};
/* values in this table range from -32..32; adjust retrieved value by -32 */
static const uint8_t svq1_motion_component_vlc[65][2] = {
/* { code, length } */
{ 0x5, 13 }, { 0x7, 13 }, { 0x5, 12 }, { 0x7, 12 },
{ 0x9, 12 }, { 0xB, 12 }, { 0xD, 12 }, { 0xF, 12 },
{ 0x9, 11 }, { 0xB, 11 }, { 0xD, 11 }, { 0xF, 11 },
{ 0x11, 11 }, { 0x13, 11 }, { 0x15, 11 }, { 0x17, 11 },
{ 0x19, 11 }, { 0x1B, 11 }, { 0x1D, 11 }, { 0x1F, 11 },
{ 0x21, 11 }, { 0x23, 11 }, { 0x13, 10 }, { 0x15, 10 },
{ 0x17, 10 }, { 0x7, 8 }, { 0x9, 8 }, { 0xB, 8 },
{ 0x7, 7 }, { 0x3, 5 }, { 0x3, 4 }, { 0x3, 3 },
{ 0x1, 1 }, { 0x2, 3 }, { 0x2, 4 }, { 0x2, 5 },
{ 0x6, 7 }, { 0xA, 8 }, { 0x8, 8 }, { 0x6, 8 },
{ 0x16, 10 }, { 0x14, 10 }, { 0x12, 10 }, { 0x22, 11 },
{ 0x20, 11 }, { 0x1E, 11 }, { 0x1C, 11 }, { 0x1A, 11 },
{ 0x18, 11 }, { 0x16, 11 }, { 0x14, 11 }, { 0x12, 11 },
{ 0x10, 11 }, { 0xE, 11 }, { 0xC, 11 }, { 0xA, 11 },
{ 0x8, 11 }, { 0xE, 12 }, { 0xC, 12 }, { 0xA, 12 },
{ 0x8, 12 }, { 0x6, 12 }, { 0x4, 12 }, { 0x6, 13 },
{ 0x4, 13 }
};
/* values in this table range from -1..6; adjust retrieved value by -1 */
static const uint8_t svq1_intra_multistage_vlc[6][8][2] = {
/* { code, length } */