PeerStreamer

/*

 * VC-1 and WMV3 decoder - DSP functions

 * Copyright (c) 2006 Konstantin Shishkov

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg 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.

 *

 * FFmpeg 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 FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 *

 */

/**

* @file vc1dsp.c

 * VC-1 and WMV3 decoder

 *

 */

#include "dsputil.h"

/** Apply overlap transform to horizontal edge

*/

static void vc1_v_overlap_c(uint8_t* src, int stride)

{

    int i;

    int a, b, c, d;

    int d1, d2;

    int rnd = 1;

    for(i = 0; i < 8; i++) {

        a = src[-2*stride];

        b = src[-stride];

        c = src[0];

        d = src[stride];

        d1 = (a - d + 3 + rnd) >> 3;

        d2 = (a - d + b - c + 4 - rnd) >> 3;

        src[-2*stride] = a - d1;

        src[-stride] = b - d2;

        src[0] = c + d2;

        src[stride] = d + d1;

        src++;

        rnd = !rnd;

    }

}

/** Apply overlap transform to vertical edge

*/

static void vc1_h_overlap_c(uint8_t* src, int stride)

{

    int i;

    int a, b, c, d;

    int d1, d2;

    int rnd = 1;

    for(i = 0; i < 8; i++) {

        a = src[-2];

        b = src[-1];

        c = src[0];

        d = src[1];

        d1 = (a - d + 3 + rnd) >> 3;

        d2 = (a - d + b - c + 4 - rnd) >> 3;

        src[-2] = a - d1;

        src[-1] = b - d2;

        src[0] = c + d2;

        src[1] = d + d1;

        src += stride;

        rnd = !rnd;

    }

}

/** Do inverse transform on 8x8 block

*/

static void vc1_inv_trans_8x8_c(DCTELEM block[64])

{

    int i;

    register int t1,t2,t3,t4,t5,t6,t7,t8;

    DCTELEM *src, *dst;

    src = block;

    dst = block;

    for(i = 0; i < 8; i++){

        t1 = 12 * (src[0] + src[4]);

        t2 = 12 * (src[0] - src[4]);

        t3 = 16 * src[2] +  6 * src[6];

        t4 =  6 * src[2] - 16 * src[6];

        t5 = t1 + t3;

        t6 = t2 + t4;

        t7 = t2 - t4;

        t8 = t1 - t3;

        t1 = 16 * src[1] + 15 * src[3] +  9 * src[5] +  4 * src[7];

        t2 = 15 * src[1] -  4 * src[3] - 16 * src[5] -  9 * src[7];

        t3 =  9 * src[1] - 16 * src[3] +  4 * src[5] + 15 * src[7];

        t4 =  4 * src[1] -  9 * src[3] + 15 * src[5] - 16 * src[7];

        dst[0] = (t5 + t1 + 4) >> 3;

        dst[1] = (t6 + t2 + 4) >> 3;

        dst[2] = (t7 + t3 + 4) >> 3;

        dst[3] = (t8 + t4 + 4) >> 3;

        dst[4] = (t8 - t4 + 4) >> 3;

        dst[5] = (t7 - t3 + 4) >> 3;

        dst[6] = (t6 - t2 + 4) >> 3;

        dst[7] = (t5 - t1 + 4) >> 3;

        src += 8;

        dst += 8;

    }

    src = block;

    dst = block;

    for(i = 0; i < 8; i++){

        t1 = 12 * (src[ 0] + src[32]);

        t2 = 12 * (src[ 0] - src[32]);

        t3 = 16 * src[16] +  6 * src[48];

        t4 =  6 * src[16] - 16 * src[48];

        t5 = t1 + t3;

        t6 = t2 + t4;

        t7 = t2 - t4;

        t8 = t1 - t3;

        t1 = 16 * src[ 8] + 15 * src[24] +  9 * src[40] +  4 * src[56];

        t2 = 15 * src[ 8] -  4 * src[24] - 16 * src[40] -  9 * src[56];

        t3 =  9 * src[ 8] - 16 * src[24] +  4 * src[40] + 15 * src[56];

        t4 =  4 * src[ 8] -  9 * src[24] + 15 * src[40] - 16 * src[56];

        dst[ 0] = (t5 + t1 + 64) >> 7;

        dst[ 8] = (t6 + t2 + 64) >> 7;

        dst[16] = (t7 + t3 + 64) >> 7;

        dst[24] = (t8 + t4 + 64) >> 7;

        dst[32] = (t8 - t4 + 64 + 1) >> 7;

        dst[40] = (t7 - t3 + 64 + 1) >> 7;

        dst[48] = (t6 - t2 + 64 + 1) >> 7;

        dst[56] = (t5 - t1 + 64 + 1) >> 7;

        src++;

        dst++;

    }

}

/** Do inverse transform on 8x4 part of block

*/

static void vc1_inv_trans_8x4_c(DCTELEM block[64], int n)

{

    int i;

    register int t1,t2,t3,t4,t5,t6,t7,t8;

    DCTELEM *src, *dst;

    int off;

    off = n * 32;

    src = block + off;

    dst = block + off;

    for(i = 0; i < 4; i++){

        t1 = 12 * (src[0] + src[4]);

        t2 = 12 * (src[0] - src[4]);

        t3 = 16 * src[2] +  6 * src[6];

        t4 =  6 * src[2] - 16 * src[6];

        t5 = t1 + t3;

        t6 = t2 + t4;

        t7 = t2 - t4;

        t8 = t1 - t3;

        t1 = 16 * src[1] + 15 * src[3] +  9 * src[5] +  4 * src[7];

        t2 = 15 * src[1] -  4 * src[3] - 16 * src[5] -  9 * src[7];

        t3 =  9 * src[1] - 16 * src[3] +  4 * src[5] + 15 * src[7];

        t4 =  4 * src[1] -  9 * src[3] + 15 * src[5] - 16 * src[7];

        dst[0] = (t5 + t1 + 4) >> 3;

        dst[1] = (t6 + t2 + 4) >> 3;

        dst[2] = (t7 + t3 + 4) >> 3;

        dst[3] = (t8 + t4 + 4) >> 3;

        dst[4] = (t8 - t4 + 4) >> 3;

        dst[5] = (t7 - t3 + 4) >> 3;

        dst[6] = (t6 - t2 + 4) >> 3;

        dst[7] = (t5 - t1 + 4) >> 3;

        src += 8;

        dst += 8;

    }

    src = block + off;

    dst = block + off;

    for(i = 0; i < 8; i++){

        t1 = 17 * (src[ 0] + src[16]);

        t2 = 17 * (src[ 0] - src[16]);

        t3 = 22 * src[ 8];

        t4 = 22 * src[24];

        t5 = 10 * src[ 8];

        t6 = 10 * src[24];

        dst[ 0] = (t1 + t3 + t6 + 64) >> 7;

        dst[ 8] = (t2 - t4 + t5 + 64) >> 7;

        dst[16] = (t2 + t4 - t5 + 64) >> 7;

        dst[24] = (t1 - t3 - t6 + 64) >> 7;

        src ++;

        dst ++;

    }

}

/** Do inverse transform on 4x8 parts of block

*/

static void vc1_inv_trans_4x8_c(DCTELEM block[64], int n)

{

    int i;

    register int t1,t2,t3,t4,t5,t6,t7,t8;

    DCTELEM *src, *dst;

    int off;

    off = n * 4;

    src = block + off;

    dst = block + off;

    for(i = 0; i < 8; i++){

        t1 = 17 * (src[0] + src[2]);

        t2 = 17 * (src[0] - src[2]);

        t3 = 22 * src[1];

        t4 = 22 * src[3];

        t5 = 10 * src[1];

        t6 = 10 * src[3];

        dst[0] = (t1 + t3 + t6 + 4) >> 3;

        dst[1] = (t2 - t4 + t5 + 4) >> 3;

        dst[2] = (t2 + t4 - t5 + 4) >> 3;

        dst[3] = (t1 - t3 - t6 + 4) >> 3;

        src += 8;

        dst += 8;

    }

    src = block + off;

    dst = block + off;

    for(i = 0; i < 4; i++){

        t1 = 12 * (src[ 0] + src[32]);

        t2 = 12 * (src[ 0] - src[32]);

        t3 = 16 * src[16] +  6 * src[48];

        t4 =  6 * src[16] - 16 * src[48];

        t5 = t1 + t3;

        t6 = t2 + t4;

        t7 = t2 - t4;

        t8 = t1 - t3;

        t1 = 16 * src[ 8] + 15 * src[24] +  9 * src[40] +  4 * src[56];

        t2 = 15 * src[ 8] -  4 * src[24] - 16 * src[40] -  9 * src[56];

        t3 =  9 * src[ 8] - 16 * src[24] +  4 * src[40] + 15 * src[56];

        t4 =  4 * src[ 8] -  9 * src[24] + 15 * src[40] - 16 * src[56];

        dst[ 0] = (t5 + t1 + 64) >> 7;

        dst[ 8] = (t6 + t2 + 64) >> 7;

        dst[16] = (t7 + t3 + 64) >> 7;

        dst[24] = (t8 + t4 + 64) >> 7;

        dst[32] = (t8 - t4 + 64 + 1) >> 7;

        dst[40] = (t7 - t3 + 64 + 1) >> 7;

        dst[48] = (t6 - t2 + 64 + 1) >> 7;

        dst[56] = (t5 - t1 + 64 + 1) >> 7;

        src++;

        dst++;

    }

}

/** Do inverse transform on 4x4 part of block

*/

static void vc1_inv_trans_4x4_c(DCTELEM block[64], int n)

{

    int i;

    register int t1,t2,t3,t4,t5,t6;

    DCTELEM *src, *dst;

    int off;

    off = (n&1) * 4 + (n&2) * 16;

    src = block + off;

    dst = block + off;

    for(i = 0; i < 4; i++){

        t1 = 17 * (src[0] + src[2]);

        t2 = 17 * (src[0] - src[2]);

        t3 = 22 * src[1];

        t4 = 22 * src[3];

        t5 = 10 * src[1];

        t6 = 10 * src[3];

        dst[0] = (t1 + t3 + t6 + 4) >> 3;

        dst[1] = (t2 - t4 + t5 + 4) >> 3;

        dst[2] = (t2 + t4 - t5 + 4) >> 3;

        dst[3] = (t1 - t3 - t6 + 4) >> 3;

        src += 8;

        dst += 8;

    }

    src = block + off;

    dst = block + off;

    for(i = 0; i < 4; i++){

        t1 = 17 * (src[ 0] + src[16]);

        t2 = 17 * (src[ 0] - src[16]);

        t3 = 22 * src[ 8];

        t4 = 22 * src[24];

        t5 = 10 * src[ 8];

        t6 = 10 * src[24];

        dst[ 0] = (t1 + t3 + t6 + 64) >> 7;

        dst[ 8] = (t2 - t4 + t5 + 64) >> 7;

        dst[16] = (t2 + t4 - t5 + 64) >> 7;

        dst[24] = (t1 - t3 - t6 + 64) >> 7;

        src ++;

        dst ++;

    }

}

/* motion compensation functions */

/** Filter used to interpolate fractional pel values

 */

static av_always_inline int vc1_mspel_filter(const uint8_t *src, int stride, int mode, int r)

{

    switch(mode){

    case 0: //no shift

        return src[0];

    case 1: // 1/4 shift

        return (-4*src[-stride] + 53*src[0] + 18*src[stride] - 3*src[stride*2] + 32 - r) >> 6;

    case 2: // 1/2 shift

        return (-src[-stride] + 9*src[0] + 9*src[stride] - src[stride*2] + 8 - r) >> 4;

    case 3: // 3/4 shift

        return (-3*src[-stride] + 18*src[0] + 53*src[stride] - 4*src[stride*2] + 32 - r) >> 6;

    }

    return 0; //should not occur

}

/** Function used to do motion compensation with bicubic interpolation

 */

static void vc1_mspel_mc(uint8_t *dst, const uint8_t *src, int stride, int mode, int rnd)

{

    int i, j;

    uint8_t tmp[8*11], *tptr;

    int m, r;

    m = (mode & 3);

    r = rnd;

    src -= stride;

    tptr = tmp;

    for(j = 0; j < 11; j++) {

        for(i = 0; i < 8; i++)

            tptr[i] = av_clip_uint8(vc1_mspel_filter(src + i, 1, m, r));

        src += stride;

        tptr += 8;

    }

    r = 1 - rnd;

    m = (mode >> 2) & 3;

    tptr = tmp + 8;

    for(j = 0; j < 8; j++) {

        for(i = 0; i < 8; i++)

            dst[i] = av_clip_uint8(vc1_mspel_filter(tptr + i, 8, m, r));

        dst += stride;

        tptr += 8;

    }

}

/* pixel functions - really are entry points to vc1_mspel_mc */

/* this one is defined in dsputil.c */

void ff_put_vc1_mspel_mc00_c(uint8_t *dst, const uint8_t *src, int stride, int rnd);

static void ff_put_vc1_mspel_mc10_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0x1, rnd);

}

static void ff_put_vc1_mspel_mc20_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0x2, rnd);

}

static void ff_put_vc1_mspel_mc30_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0x3, rnd);

}

static void ff_put_vc1_mspel_mc01_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0x4, rnd);

}

static void ff_put_vc1_mspel_mc11_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0x5, rnd);

}

static void ff_put_vc1_mspel_mc21_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0x6, rnd);

}

static void ff_put_vc1_mspel_mc31_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0x7, rnd);

}

static void ff_put_vc1_mspel_mc02_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0x8, rnd);

}

static void ff_put_vc1_mspel_mc12_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0x9, rnd);

}

static void ff_put_vc1_mspel_mc22_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0xA, rnd);

}

static void ff_put_vc1_mspel_mc32_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0xB, rnd);

}

static void ff_put_vc1_mspel_mc03_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0xC, rnd);

}

static void ff_put_vc1_mspel_mc13_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0xD, rnd);

}

static void ff_put_vc1_mspel_mc23_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0xE, rnd);

}

static void ff_put_vc1_mspel_mc33_c(uint8_t *dst, const uint8_t *src, int stride, int rnd) {

    vc1_mspel_mc(dst, src, stride, 0xF, rnd);

}

void ff_vc1dsp_init(DSPContext* dsp, AVCodecContext *avctx) {

    dsp->vc1_inv_trans_8x8 = vc1_inv_trans_8x8_c;

    dsp->vc1_inv_trans_4x8 = vc1_inv_trans_4x8_c;

    dsp->vc1_inv_trans_8x4 = vc1_inv_trans_8x4_c;

    dsp->vc1_inv_trans_4x4 = vc1_inv_trans_4x4_c;

    dsp->vc1_h_overlap = vc1_h_overlap_c;

    dsp->vc1_v_overlap = vc1_v_overlap_c;

    dsp->put_vc1_mspel_pixels_tab[ 0] = ff_put_vc1_mspel_mc00_c;

    dsp->put_vc1_mspel_pixels_tab[ 1] = ff_put_vc1_mspel_mc10_c;

    dsp->put_vc1_mspel_pixels_tab[ 2] = ff_put_vc1_mspel_mc20_c;

    dsp->put_vc1_mspel_pixels_tab[ 3] = ff_put_vc1_mspel_mc30_c;

    dsp->put_vc1_mspel_pixels_tab[ 4] = ff_put_vc1_mspel_mc01_c;

    dsp->put_vc1_mspel_pixels_tab[ 5] = ff_put_vc1_mspel_mc11_c;

    dsp->put_vc1_mspel_pixels_tab[ 6] = ff_put_vc1_mspel_mc21_c;

    dsp->put_vc1_mspel_pixels_tab[ 7] = ff_put_vc1_mspel_mc31_c;

    dsp->put_vc1_mspel_pixels_tab[ 8] = ff_put_vc1_mspel_mc02_c;

    dsp->put_vc1_mspel_pixels_tab[ 9] = ff_put_vc1_mspel_mc12_c;

    dsp->put_vc1_mspel_pixels_tab[10] = ff_put_vc1_mspel_mc22_c;

    dsp->put_vc1_mspel_pixels_tab[11] = ff_put_vc1_mspel_mc32_c;

    dsp->put_vc1_mspel_pixels_tab[12] = ff_put_vc1_mspel_mc03_c;

    dsp->put_vc1_mspel_pixels_tab[13] = ff_put_vc1_mspel_mc13_c;

    dsp->put_vc1_mspel_pixels_tab[14] = ff_put_vc1_mspel_mc23_c;

    dsp->put_vc1_mspel_pixels_tab[15] = ff_put_vc1_mspel_mc33_c;

}