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/*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "avcodec.h"
#include "dsputil.h"
#include "wmv2dsp.h"
#define W0 2048
#define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */
#define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */
#define W3 2408 /* 2048*sqrt (2)*cos (3*pi/16) */
#define W4 2048 /* 2048*sqrt (2)*cos (4*pi/16) */
#define W5 1609 /* 2048*sqrt (2)*cos (5*pi/16) */
#define W6 1108 /* 2048*sqrt (2)*cos (6*pi/16) */
#define W7 565 /* 2048*sqrt (2)*cos (7*pi/16) */
static void wmv2_idct_row(short * b)
{
int s1, s2;
int a0, a1, a2, a3, a4, a5, a6, a7;
/* step 1 */
a1 = W1 * b[1] + W7 * b[7];
a7 = W7 * b[1] - W1 * b[7];
a5 = W5 * b[5] + W3 * b[3];
a3 = W3 * b[5] - W5 * b[3];
a2 = W2 * b[2] + W6 * b[6];
a6 = W6 * b[2] - W2 * b[6];
a0 = W0 * b[0] + W0 * b[4];
a4 = W0 * b[0] - W0 * b[4];
/* step 2 */
s1 = (181 * (a1 - a5 + a7 - a3) + 128) >> 8; // 1, 3, 5, 7
s2 = (181 * (a1 - a5 - a7 + a3) + 128) >> 8;
/* step 3 */
b[0] = (a0 + a2 + a1 + a5 + (1 << 7)) >> 8;
b[1] = (a4 + a6 + s1 + (1 << 7)) >> 8;
b[2] = (a4 - a6 + s2 + (1 << 7)) >> 8;
b[3] = (a0 - a2 + a7 + a3 + (1 << 7)) >> 8;
b[4] = (a0 - a2 - a7 - a3 + (1 << 7)) >> 8;
b[5] = (a4 - a6 - s2 + (1 << 7)) >> 8;
b[6] = (a4 + a6 - s1 + (1 << 7)) >> 8;
b[7] = (a0 + a2 - a1 - a5 + (1 << 7)) >> 8;
}
static void wmv2_idct_col(short * b)
{
int s1, s2;
int a0, a1, a2, a3, a4, a5, a6, a7;
/* step 1, with extended precision */
a1 = (W1 * b[8 * 1] + W7 * b[8 * 7] + 4) >> 3;
a7 = (W7 * b[8 * 1] - W1 * b[8 * 7] + 4) >> 3;
a5 = (W5 * b[8 * 5] + W3 * b[8 * 3] + 4) >> 3;
a3 = (W3 * b[8 * 5] - W5 * b[8 * 3] + 4) >> 3;
a2 = (W2 * b[8 * 2] + W6 * b[8 * 6] + 4) >> 3;
a6 = (W6 * b[8 * 2] - W2 * b[8 * 6] + 4) >> 3;
a0 = (W0 * b[8 * 0] + W0 * b[8 * 4] ) >> 3;
a4 = (W0 * b[8 * 0] - W0 * b[8 * 4] ) >> 3;
/* step 2 */
s1 = (181 * (a1 - a5 + a7 - a3) + 128) >> 8;
s2 = (181 * (a1 - a5 - a7 + a3) + 128) >> 8;
/* step 3 */
b[8 * 0] = (a0 + a2 + a1 + a5 + (1 << 13)) >> 14;
b[8 * 1] = (a4 + a6 + s1 + (1 << 13)) >> 14;
b[8 * 2] = (a4 - a6 + s2 + (1 << 13)) >> 14;
b[8 * 3] = (a0 - a2 + a7 + a3 + (1 << 13)) >> 14;
b[8 * 4] = (a0 - a2 - a7 - a3 + (1 << 13)) >> 14;
b[8 * 5] = (a4 - a6 - s2 + (1 << 13)) >> 14;
b[8 * 6] = (a4 + a6 - s1 + (1 << 13)) >> 14;
b[8 * 7] = (a0 + a2 - a1 - a5 + (1 << 13)) >> 14;
}
static void wmv2_idct_add_c(uint8_t *dest, int line_size, int16_t *block)
{
int i;
for (i = 0; i < 64; i += 8)
wmv2_idct_row(block + i);
for (i = 0; i < 8; i++)
wmv2_idct_col(block + i);
for (i = 0; i < 8; i++) {
dest[0] = av_clip_uint8(dest[0] + block[0]);
dest[1] = av_clip_uint8(dest[1] + block[1]);
dest[2] = av_clip_uint8(dest[2] + block[2]);
dest[3] = av_clip_uint8(dest[3] + block[3]);
dest[4] = av_clip_uint8(dest[4] + block[4]);
dest[5] = av_clip_uint8(dest[5] + block[5]);
dest[6] = av_clip_uint8(dest[6] + block[6]);
dest[7] = av_clip_uint8(dest[7] + block[7]);
dest += line_size;
block += 8;
}
}
static void wmv2_idct_put_c(uint8_t *dest, int line_size, int16_t *block)
{
int i;
for (i = 0; i < 64; i += 8)
wmv2_idct_row(block + i);
for (i = 0; i < 8; i++)
wmv2_idct_col(block + i);
for (i = 0; i < 8; i++) {
dest[0] = av_clip_uint8(block[0]);
dest[1] = av_clip_uint8(block[1]);
dest[2] = av_clip_uint8(block[2]);
dest[3] = av_clip_uint8(block[3]);
dest[4] = av_clip_uint8(block[4]);
dest[5] = av_clip_uint8(block[5]);
dest[6] = av_clip_uint8(block[6]);
dest[7] = av_clip_uint8(block[7]);
dest += line_size;
block += 8;
}
}
av_cold void ff_wmv2dsp_init(WMV2DSPContext *c)
{
c->idct_add = wmv2_idct_add_c;
c->idct_put = wmv2_idct_put_c;
c->idct_perm = FF_NO_IDCT_PERM;
}
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