uint32_t
dequant_mpeg_intra_c(int16_t * data,
const int16_t * coeff,
const uint32_t quant,
const uint32_t dcscalar,
const uint16_t * mpeg_quant_matrices)
{
const uint16_t *intra_matrix = get_intra_matrix(mpeg_quant_matrices);
int i;
data[0] = coeff[0] * dcscalar;
if (data[0] < -2048) {
data[0] = -2048;
} else if (data[0] > 2047) {
data[0] = 2047;
}
for (i = 1; i < 64; i++) {
if (coeff[i] == 0) {
data[i] = 0;
} else if (coeff[i] < 0) {
uint32_t level = -coeff[i];
level = (level * intra_matrix[i] * quant) >> 3;
data[i] = (level <= 2048 ? -(int16_t) level : -2048);
} else {
uint32_t
dequant_mpeg_intra_altivec_c(int16_t * data,
const int16_t * coeff,
const uint32_t quant,
const uint32_t dcscalar,
const uint16_t * mpeg_quant_matrices)
{
register const uint16_t *intra_matrix = get_intra_matrix(mpeg_quant_matrices);
register const int16_t *coeff_ptr = coeff;
register int16_t *data_ptr = data;
register vec_sint16_t ox00;
register vec_sint16_t level;
register vec_sint16_t vec_2048;
register vec_uint16_t vintra;
register vec_uint32_t swap;
register vec_uint32_t even,odd;
register vec_uint32_t et,ot,t;
vec_uint32_t vquant;
vector bool short zero_less;
vector bool short overflow;
#ifdef DEBUG
if((long)data & 0xf)
fprintf(stderr, "xvidcore: error in dequant_mpeg_intra_altivec_c, incorrect align: %x\n", data);
#endif
/* Initialize */
ox00 = vec_splat_s16(0);
*((uint32_t*)&vquant) = quant;
vquant = vec_splat(vquant,0);
swap = vec_rl(vquant, vec_splat_u32(-16));
vec_2048 = (vec_sint16_t)vec_rl(vec_splat_u16(8),vec_splat_u16(8));
DEQUANT_MPEG_INTRA();
DEQUANT_MPEG_INTRA();
DEQUANT_MPEG_INTRA();
DEQUANT_MPEG_INTRA();
DEQUANT_MPEG_INTRA();
DEQUANT_MPEG_INTRA();
DEQUANT_MPEG_INTRA();
DEQUANT_MPEG_INTRA();
/* Process the first */
data[0] = coeff[0] * dcscalar;
if (data[0] < -2048) {
data[0] = -2048;
} else if (data[0] > 2047) {
data[0] = 2047;
}
return 0;
}
/* dequantize intra-block & clamp to [-2048,2047]
*
* data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4;
*/
void dequant_mpeg_intra(int *data, const int *coeff, dword quant, dword dcscalar, const dword *mpeg_quant_matrices) {
const dword *intra_matrix = get_intra_matrix(mpeg_quant_matrices);
data[0] = coeff[0] * dcscalar;
if(data[0] < -2048) {
data[0] = -2048;
} else if(data[0] > 2047) {
data[0] = 2047;
}
for(int i = 1; i < 64; i++) {
if(coeff[i] == 0) {
data[i] = 0;
} else if(coeff[i] < 0) {
int level = -coeff[i];
level = (level * intra_matrix[i] * quant) >> 3;
data[i] = (level <= 2048 ? -level : -2048);
} else {
