static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
int i;
for(i=0; i<128; i++){
int level= i-64;
int run;
if (!level)
continue;
for(run=0; run<64; run++){
int len, code;
int alevel= FFABS(level);
if (alevel > rl->max_level[0][run])
code= 111; /*rl->n*/
else
code= rl->index_run[0][run] + alevel - 1;
if (code < 111 /* rl->n */) {
/* length of vlc and sign */
len= rl->table_vlc[code][1]+1;
} else {
len= rl->table_vlc[111/*rl->n*/][1]+6;
if (alevel < 128) {
len += 8;
} else {
len += 16;
}
}
uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len;
}
}
}
static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len)
{
int i;
for(i = 0; i < 128; i++)
{
int level = i - 64;
int run;
for(run = 0; run < 64; run++)
{
int len, bits, code;
int alevel = FFABS(level);
int sign = (level >> 31) & 1;
if (alevel > rl->max_level[0][run])
code = 111; /*rl->n*/
else
code = rl->index_run[0][run] + alevel - 1;
if (code < 111 /* rl->n */)
{
/* store the vlc & sign at once */
len = rl->table_vlc[code][1] + 1;
bits = (rl->table_vlc[code][0] << 1) + sign;
}
else
{
len = rl->table_vlc[111/*rl->n*/][1] + 6;
bits = rl->table_vlc[111/*rl->n*/][0] << 6;
bits |= run;
if (alevel < 128)
{
bits <<= 8;
len += 8;
bits |= level & 0xff;
}
else
{
bits <<= 16;
len += 16;
bits |= level & 0xff;
if (level < 0)
{
bits |= 0x8001 + level + 255;
}
else
{
bits |= level & 0xffff;
}
}
}
uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)] = len;
}
}
}
/**
* Return the number of bits that encoding the 8x8 block in block would need.
* @param[in] block_last_index last index in scantable order that refers to a non zero element in block.
*/
static inline int get_block_rate(MpegEncContext * s, DCTELEM block[64], int block_last_index, uint8_t scantable[64]){
int last=0;
int j;
int rate=0;
for(j=1; j<=block_last_index; j++){
const int index= scantable[j];
int level= block[index];
if(level){
level+= 64;
if((level&(~127)) == 0){
if(j<block_last_index) rate+= s->intra_ac_vlc_length [UNI_AC_ENC_INDEX(j-last-1, level)];
else rate+= s->intra_ac_vlc_last_length[UNI_AC_ENC_INDEX(j-last-1, level)];
}else
rate += s->ac_esc_length;
last= j;
}
}
return rate;
}