vp3dsp_mmx.c

arm平台下的H264编码和解码源代码

/*
 * Copyright (C) 2004 the ffmpeg project
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/**
 * @file vp3dsp_mmx.c
 * MMX-optimized functions cribbed from the original VP3 source code.
 */

#include "../dsputil.h"
#include "mmx.h"

#define IdctAdjustBeforeShift 8

/* (12 * 4) 2-byte memory locations ( = 96 bytes total)
 * idct_constants[0..15] = Mask table (M(I))
 * idct_constants[16..43] = Cosine table (C(I))
 * idct_constants[44..47] = 8
 */
static uint16_t idct_constants[(4 + 7 + 1) * 4];
static uint16_t idct_cosine_table[7] = {
    64277, 60547, 54491, 46341, 36410, 25080, 12785
};

#define r0 mm0
#define r1 mm1
#define r2 mm2
#define r3 mm3
#define r4 mm4
#define r5 mm5
#define r6 mm6
#define r7 mm7

/* from original comments: The Macro does IDct on 4 1-D Dcts */
#define BeginIDCT() \
    movq_m2r(*I(3), r2); \
    movq_m2r(*C(3), r6); \
    movq_r2r(r2, r4); \
    movq_m2r(*J(5), r7); \
    pmulhw_r2r(r6, r4); \
    movq_m2r(*C(5), r1); \
    pmulhw_r2r(r7, r6); \
    movq_r2r(r1, r5); \
    pmulhw_r2r(r2, r1); \
    movq_m2r(*I(1), r3); \
    pmulhw_r2r(r7, r5); \
    movq_m2r(*C(1), r0); \
    paddw_r2r(r2, r4); \
    paddw_r2r(r7, r6); \
    paddw_r2r(r1, r2); \
    movq_m2r(*J(7), r1); \
    paddw_r2r(r5, r7); \
    movq_r2r(r0, r5); \
    pmulhw_r2r(r3, r0); \
    paddsw_r2r(r7, r4); \
    pmulhw_r2r(r1, r5); \
    movq_m2r(*C(7), r7); \
    psubsw_r2r(r2, r6); \
    paddw_r2r(r3, r0); \
    pmulhw_r2r(r7, r3); \
    movq_m2r(*I(2), r2); \
    pmulhw_r2r(r1, r7); \
    paddw_r2r(r1, r5); \
    movq_r2r(r2, r1); \
    pmulhw_m2r(*C(2), r2); \
    psubsw_r2r(r5, r3); \
    movq_m2r(*J(6), r5); \
    paddsw_r2r(r7, r0); \
    movq_r2r(r5, r7); \
    psubsw_r2r(r4, r0); \
    pmulhw_m2r(*C(2), r5); \
    paddw_r2r(r1, r2); \
    pmulhw_m2r(*C(6), r1); \
    paddsw_r2r(r4, r4); \
    paddsw_r2r(r0, r4); \
    psubsw_r2r(r6, r3); \
    paddw_r2r(r7, r5); \
    paddsw_r2r(r6, r6); \
    pmulhw_m2r(*C(6), r7); \
    paddsw_r2r(r3, r6); \
    movq_r2m(r4, *I(1)); \
    psubsw_r2r(r5, r1); \
    movq_m2r(*C(4), r4); \
    movq_r2r(r3, r5); \
    pmulhw_r2r(r4, r3); \
    paddsw_r2r(r2, r7); \
    movq_r2m(r6, *I(2)); \
    movq_r2r(r0, r2); \
    movq_m2r(*I(0), r6); \
    pmulhw_r2r(r4, r0); \
    paddw_r2r(r3, r5); \
    movq_m2r(*J(4), r3); \
    psubsw_r2r(r1, r5); \
    paddw_r2r(r0, r2); \
    psubsw_r2r(r3, r6); \
    movq_r2r(r6, r0); \
    pmulhw_r2r(r4, r6); \
    paddsw_r2r(r3, r3); \
    paddsw_r2r(r1, r1); \
    paddsw_r2r(r0, r3); \
    paddsw_r2r(r5, r1); \
    pmulhw_r2r(r3, r4); \
    paddsw_r2r(r0, r6); \
    psubsw_r2r(r2, r6); \
    paddsw_r2r(r2, r2); \
    movq_m2r(*I(1), r0); \
    paddsw_r2r(r6, r2); \
    paddw_r2r(r3, r4); \
    psubsw_r2r(r1, r2);

/* RowIDCT gets ready to transpose */
#define RowIDCT() \
    \
    BeginIDCT() \
    \
    movq_m2r(*I(2), r3); \
    psubsw_r2r(r7, r4); \
    paddsw_r2r(r1, r1); \
    paddsw_r2r(r7, r7); \
    paddsw_r2r(r2, r1); \
    paddsw_r2r(r4, r7); \
    psubsw_r2r(r3, r4); \
    psubsw_r2r(r5, r6); \
    paddsw_r2r(r5, r5); \
    paddsw_r2r(r4, r3); \
    paddsw_r2r(r6, r5); \
    psubsw_r2r(r0, r7); \
    paddsw_r2r(r0, r0); \
    movq_r2m(r1, *I(1)); \
    paddsw_r2r(r7, r0);

/* Column IDCT normalizes and stores final results */
#define ColumnIDCT() \
    \
    BeginIDCT() \
    \
    paddsw_m2r(*Eight, r2); \
    paddsw_r2r(r1, r1); \
    paddsw_r2r(r2, r1); \
    psraw_i2r(4, r2); \
    psubsw_r2r(r7, r4); \
    psraw_i2r(4, r1); \
    movq_m2r(*I(2), r3); \
    paddsw_r2r(r7, r7); \
    movq_r2m(r2, *I(2)); \
    paddsw_r2r(r4, r7); \
    movq_r2m(r1, *I(1)); \
    psubsw_r2r(r3, r4); \
    paddsw_m2r(*Eight, r4); \
    paddsw_r2r(r3, r3); \
    paddsw_r2r(r4, r3); \
    psraw_i2r(4, r4); \
    psubsw_r2r(r5, r6); \
    psraw_i2r(4, r3); \
    paddsw_m2r(*Eight, r6); \
    paddsw_r2r(r5, r5); \
    paddsw_r2r(r6, r5); \
    psraw_i2r(4, r6); \
    movq_r2m(r4, *J(4)); \
    psraw_i2r(4, r5); \
    movq_r2m(r3, *I(3)); \
    psubsw_r2r(r0, r7); \
    paddsw_m2r(*Eight, r7); \
    paddsw_r2r(r0, r0); \
    paddsw_r2r(r7, r0); \
    psraw_i2r(4, r7); \
    movq_r2m(r6, *J(6)); \
    psraw_i2r(4, r0); \
    movq_r2m(r5, *J(5)); \
    movq_r2m(r7, *J(7)); \
    movq_r2m(r0, *I(0));


/* Following macro does two 4x4 transposes in place.

  At entry (we assume):

        r0 = a3 a2 a1 a0
        I(1) = b3 b2 b1 b0
        r2 = c3 c2 c1 c0
        r3 = d3 d2 d1 d0

        r4 = e3 e2 e1 e0
        r5 = f3 f2 f1 f0
        r6 = g3 g2 g1 g0
        r7 = h3 h2 h1 h0

   At exit, we have:

        I(0) = d0 c0 b0 a0
        I(1) = d1 c1 b1 a1
        I(2) = d2 c2 b2 a2
        I(3) = d3 c3 b3 a3

        J(4) = h0 g0 f0 e0
        J(5) = h1 g1 f1 e1
        J(6) = h2 g2 f2 e2
        J(7) = h3 g3 f3 e3

   I(0) I(1) I(2) I(3)  is the transpose of r0 I(1) r2 r3.
   J(4) J(5) J(6) J(7)  is the transpose of r4 r5 r6 r7.

   Since r1 is free at entry, we calculate the Js first. */

#define Transpose() \
    movq_r2r(r4, r1); \
    punpcklwd_r2r(r5, r4); \
    movq_r2m(r0, *I(0)); \
    punpckhwd_r2r(r5, r1); \
    movq_r2r(r6, r0); \
    punpcklwd_r2r(r7, r6); \
    movq_r2r(r4, r5); \
    punpckldq_r2r(r6, r4); \
    punpckhdq_r2r(r6, r5); \
    movq_r2r(r1, r6); \
    movq_r2m(r4, *J(4)); \
    punpckhwd_r2r(r7, r0); \
    movq_r2m(r5, *J(5)); \
    punpckhdq_r2r(r0, r6); \
    movq_m2r(*I(0), r4); \
    punpckldq_r2r(r0, r1); \
    movq_m2r(*I(1), r5); \
    movq_r2r(r4, r0); \
    movq_r2m(r6, *J(7)); \
    punpcklwd_r2r(r5, r0); \
    movq_r2m(r1, *J(6)); \
    punpckhwd_r2r(r5, r4); \
    movq_r2r(r2, r5); \
    punpcklwd_r2r(r3, r2); \
    movq_r2r(r0, r1); \
    punpckldq_r2r(r2, r0); \
    punpckhdq_r2r(r2, r1); \
    movq_r2r(r4, r2); \
    movq_r2m(r0, *I(0)); \
    punpckhwd_r2r(r3, r5); \
    movq_r2m(r1, *I(1)); \
    punpckhdq_r2r(r5, r4); \
    punpckldq_r2r(r5, r2); \
    movq_r2m(r4, *I(3)); \
    movq_r2m(r2, *I(2));


void vp3_dsp_init_mmx(void)
{
    int j = 16;
    uint16_t *p;

    do {
        idct_constants[--j] = 0;
    } while (j);

    idct_constants[0]  = idct_constants[5] = 
    idct_constants[10] = idct_constants[15] = 65535;

    j = 1;
    do {
        p = idct_constants + ((j + 3) << 2);
        p[0] = p[1] = p[2] = p[3] = idct_cosine_table[j - 1];
    } while (++j <= 7);

    idct_constants[44] = idct_constants[45] = 
    idct_constants[46] = idct_constants[47] = IdctAdjustBeforeShift;
}

static void vp3_idct_mmx(int16_t *input_data, int16_t *dequant_matrix,
     int16_t *output_data)
{
    /* eax = quantized input
     * ebx = dequantizer matrix
     * ecx = IDCT constants
     *  M(I) = ecx + MaskOffset(0) + I * 8
     *  C(I) = ecx + CosineOffset(32) + (I-1) * 8
     * edx = output
     * r0..r7 = mm0..mm7
     */

#define M(x) (idct_constants + x * 4)
#define C(x) (idct_constants + 16 + (x - 1) * 4)
#define Eight (idct_constants + 44)

    movq_m2r(*input_data, r0);
    pmullw_m2r(*dequant_matrix, r0);
    movq_m2r(*(input_data + 8), r1);
    pmullw_m2r(*(dequant_matrix + 8), r1);
    movq_m2r(*M(0), r2);
    movq_r2r(r0, r3);
    movq_m2r(*(input_data + 4), r4);
    psrlq_i2r(16, r0);
    pmullw_m2r(*(dequant_matrix + 4), r4);
    pand_r2r(r2, r3);
    movq_r2r(r0, r5);
    movq_r2r(r1, r6);
    pand_r2r(r2, r5);
    psllq_i2r(32, r6);
    movq_m2r(*M(3), r7);
    pxor_r2r(r5, r0);
    pand_r2r(r6, r7);
    por_r2r(r3, r0);
    pxor_r2r(r7, r6);
    por_r2r(r7, r0);
    movq_m2r(*M(3), r7);
    movq_r2r(r4, r3);
    movq_r2m(r0, *output_data);

    pand_r2r(r2, r3);
    movq_m2r(*(input_data + 16), r0);
    psllq_i2r(16, r3);
    pmullw_m2r(*(dequant_matrix + 16), r0);
    pand_r2r(r1, r7);
    por_r2r(r3, r5);
    por_r2r(r6, r7);
    movq_m2r(*(input_data + 12), r3);
    por_r2r(r5, r7);