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/* ------------------------------------------------------------------
* Copyright (C) 1998-2009 PacketVideo
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
#include "avclib_common.h"
/* input are in the first 16 elements of block,
output must be in the location specified in Figure 8-6. */
/* subclause 8.5.6 */
void Intra16DCTrans(int16 *block, int Qq, int Rq)
{
int m0, m1, m2, m3;
int j, offset;
int16 *inout;
int scale = dequant_coefres[Rq][0];
inout = block;
for (j = 0; j < 4; j++)
{
m0 = inout[0] + inout[4];
m1 = inout[0] - inout[4];
m2 = inout[8] + inout[12];
m3 = inout[8] - inout[12];
inout[0] = m0 + m2;
inout[4] = m0 - m2;
inout[8] = m1 - m3;
inout[12] = m1 + m3;
inout += 64;
}
inout = block;
if (Qq >= 2) /* this way should be faster than JM */
{ /* they use (((m4*scale)<<(QPy/6))+2)>>2 for both cases. */
Qq -= 2;
for (j = 0; j < 4; j++)
{
m0 = inout[0] + inout[64];
m1 = inout[0] - inout[64];
m2 = inout[128] + inout[192];
m3 = inout[128] - inout[192];
inout[0] = ((m0 + m2) * scale) << Qq;
inout[64] = ((m0 - m2) * scale) << Qq;
inout[128] = ((m1 - m3) * scale) << Qq;
inout[192] = ((m1 + m3) * scale) << Qq;
inout += 4;
}
}
else
{
Qq = 2 - Qq;
offset = 1 << (Qq - 1);
for (j = 0; j < 4; j++)
{
m0 = inout[0] + inout[64];
m1 = inout[0] - inout[64];
m2 = inout[128] + inout[192];
m3 = inout[128] - inout[192];
inout[0] = (((m0 + m2) * scale + offset) >> Qq);
inout[64] = (((m0 - m2) * scale + offset) >> Qq);
inout[128] = (((m1 - m3) * scale + offset) >> Qq);
inout[192] = (((m1 + m3) * scale + offset) >> Qq);
inout += 4;
}
}
return ;
}
/* see subclase 8.5.8 */
void itrans(int16 *block, uint8 *pred, uint8 *cur, int width)
{
int e0, e1, e2, e3; /* note, at every step of the calculation, these values */
/* shall never exceed 16bit sign value, but we don't check */
int i; /* to save the cycles. */
int16 *inout;
inout = block;
for (i = 4; i > 0; i--)
{
e0 = inout[0] + inout[2];
e1 = inout[0] - inout[2];
e2 = (inout[1] >> 1) - inout[3];
e3 = inout[1] + (inout[3] >> 1);
inout[0] = e0 + e3;
inout[1] = e1 + e2;
inout[2] = e1 - e2;
inout[3] = e0 - e3;
inout += 16;
}
for (i = 4; i > 0; i--)
{
e0 = block[0] + block[32];
e1 = block[0] - block[32];
e2 = (block[16] >> 1) - block[48];
e3 = block[16] + (block[48] >> 1);
e0 += e3;
e3 = (e0 - (e3 << 1)); /* e0-e3 */
e1 += e2;
e2 = (e1 - (e2 << 1)); /* e1-e2 */
e0 += 32;
e1 += 32;
e2 += 32;
e3 += 32;
#ifdef USE_PRED_BLOCK
e0 = pred[0] + (e0 >> 6);
if ((uint)e0 > 0xFF) e0 = 0xFF & (~(e0 >> 31)); /* clip */
e1 = pred[20] + (e1 >> 6);
if ((uint)e1 > 0xFF) e1 = 0xFF & (~(e1 >> 31)); /* clip */
e2 = pred[40] + (e2 >> 6);
if ((uint)e2 > 0xFF) e2 = 0xFF & (~(e2 >> 31)); /* clip */
e3 = pred[60] + (e3 >> 6);
if ((uint)e3 > 0xFF) e3 = 0xFF & (~(e3 >> 31)); /* clip */
*cur = e0;
*(cur += width) = e1;
*(cur += width) = e2;
cur[width] = e3;
cur -= (width << 1);
cur++;
pred++;
#else
OSCL_UNUSED_ARG(pred);
e0 = *cur + (e0 >> 6);
if ((uint)e0 > 0xFF) e0 = 0xFF & (~(e0 >> 31)); /* clip */
*cur = e0;
e1 = *(cur += width) + (e1 >> 6);
if ((uint)e1 > 0xFF) e1 = 0xFF & (~(e1 >> 31)); /* clip */
*cur = e1;
e2 = *(cur += width) + (e2 >> 6);
if ((uint)e2 > 0xFF) e2 = 0xFF & (~(e2 >> 31)); /* clip */
*cur = e2;
e3 = cur[width] + (e3 >> 6);
if ((uint)e3 > 0xFF) e3 = 0xFF & (~(e3 >> 31)); /* clip */
cur[width] = e3;
cur -= (width << 1);
cur++;
#endif
block++;
}
return ;
}
/* see subclase 8.5.8 */
void ictrans(int16 *block, uint8 *pred, uint8 *cur, int width)
{
int e0, e1, e2, e3; /* note, at every step of the calculation, these values */
/* shall never exceed 16bit sign value, but we don't check */
int i; /* to save the cycles. */
int16 *inout;
inout = block;
for (i = 4; i > 0; i--)
{
e0 = inout[0] + inout[2];
e1 = inout[0] - inout[2];
e2 = (inout[1] >> 1) - inout[3];
e3 = inout[1] + (inout[3] >> 1);
inout[0] = e0 + e3;
inout[1] = e1 + e2;
inout[2] = e1 - e2;
inout[3] = e0 - e3;
inout += 16;
}
for (i = 4; i > 0; i--)
{
e0 = block[0] + block[32];
e1 = block[0] - block[32];
e2 = (block[16] >> 1) - block[48];
e3 = block[16] + (block[48] >> 1);
e0 += e3;
e3 = (e0 - (e3 << 1)); /* e0-e3 */
e1 += e2;
e2 = (e1 - (e2 << 1)); /* e1-e2 */
e0 += 32;
e1 += 32;
e2 += 32;
e3 += 32;
#ifdef USE_PRED_BLOCK
e0 = pred[0] + (e0 >> 6);
if ((uint)e0 > 0xFF) e0 = 0xFF & (~(e0 >> 31)); /* clip */
e1 = pred[12] + (e1 >> 6);
if ((uint)e1 > 0xFF) e1 = 0xFF & (~(e1 >> 31)); /* clip */
e2 = pred[24] + (e2 >> 6);
if ((uint)e2 > 0xFF) e2 = 0xFF & (~(e2 >> 31)); /* clip */
e3 = pred[36] + (e3 >> 6);
if ((uint)e3 > 0xFF) e3 = 0xFF & (~(e3 >> 31)); /* clip */
*cur = e0;
*(cur += width) = e1;
*(cur += width) = e2;
cur[width] = e3;
cur -= (width << 1);
cur++;
pred++;
#else
OSCL_UNUSED_ARG(pred);
e0 = *cur + (e0 >> 6);
if ((uint)e0 > 0xFF) e0 = 0xFF & (~(e0 >> 31)); /* clip */
*cur = e0;
e1 = *(cur += width) + (e1 >> 6);
if ((uint)e1 > 0xFF) e1 = 0xFF & (~(e1 >> 31)); /* clip */
*cur = e1;
e2 = *(cur += width) + (e2 >> 6);
if ((uint)e2 > 0xFF) e2 = 0xFF & (~(e2 >> 31)); /* clip */
*cur = e2;
e3 = cur[width] + (e3 >> 6);
if ((uint)e3 > 0xFF) e3 = 0xFF & (~(e3 >> 31)); /* clip */
cur[width] = e3;
cur -= (width << 1);
cur++;
#endif
block++;
}
return ;
}
/* see subclause 8.5.7 */
void ChromaDCTrans(int16 *block, int Qq, int Rq)
{
int c00, c01, c10, c11;
int f0, f1, f2, f3;
int scale = dequant_coefres[Rq][0];
c00 = block[0] + block[4];
c01 = block[0] - block[4];
c10 = block[64] + block[68];
c11 = block[64] - block[68];
f0 = c00 + c10;
f1 = c01 + c11;
f2 = c00 - c10;
f3 = c01 - c11;
if (Qq >= 1)
{
Qq -= 1;
block[0] = (f0 * scale) << Qq;
block[4] = (f1 * scale) << Qq;
block[64] = (f2 * scale) << Qq;
block[68] = (f3 * scale) << Qq;
}
else
{
block[0] = (f0 * scale) >> 1;
block[4] = (f1 * scale) >> 1;
block[64] = (f2 * scale) >> 1;
block[68] = (f3 * scale) >> 1;
}
return ;
}
void copy_block(uint8 *pred, uint8 *cur, int width, int pred_pitch)
{
uint32 temp;
temp = *((uint32*)pred);
pred += pred_pitch;
*((uint32*)cur) = temp;
cur += width;
temp = *((uint32*)pred);
pred += pred_pitch;
*((uint32*)cur) = temp;
cur += width;
temp = *((uint32*)pred);
pred += pred_pitch;
*((uint32*)cur) = temp;
cur += width;
temp = *((uint32*)pred);
*((uint32*)cur) = temp;
return ;
}
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