1/*
2 * BlackFin MPEGVIDEO OPTIMIZATIONS
3 *
4 * Copyright (C) 2007 Marc Hoffman <mmh@pleasantst.com>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include "libavcodec/avcodec.h"
24#include "libavcodec/dsputil.h"
25#include "libavcodec/mpegvideo.h"
26#include "dsputil_bfin.h"
27
28
29void ff_bfin_fdct (DCTELEM *block) attribute_l1_text;
30
31
32static int dct_quantize_bfin (MpegEncContext *s,
33                              DCTELEM *block, int n,
34                              int qscale, int *overflow)
35{
36    int last_non_zero, q, start_i;
37    const short *qmat;
38    short *bias;
39    const uint8_t *scantable= s->intra_scantable.scantable;
40    short dc;
41    int   max=0;
42
43    PROF("fdct",0);
44    ff_bfin_fdct (block);
45    EPROF();
46
47    PROF("denoise",1);
48    if(s->dct_error_sum)
49        s->denoise_dct(s, block);
50    EPROF();
51
52    PROF("quant-init",2);
53    if (s->mb_intra) {
54        if (!s->h263_aic) {
55            if (n < 4)
56                q = s->y_dc_scale;
57            else
58                q = s->c_dc_scale;
59            q = q << 3;
60        } else
61            /* For AIC we skip quant/dequant of INTRADC */
62            q = 1 << 3;
63
64        /* note: block[0] is assumed to be positive */
65        dc = block[0] = (block[0] + (q >> 1)) / q;
66        start_i = 1;
67        last_non_zero = 0;
68        bias = s->q_intra_matrix16[qscale][1];
69        qmat = s->q_intra_matrix16[qscale][0];
70
71    } else {
72        start_i = 0;
73        last_non_zero = -1;
74        bias = s->q_inter_matrix16[qscale][1];
75        qmat = s->q_inter_matrix16[qscale][0];
76
77    }
78    EPROF();
79
80    PROF("quantize",4);
81
82    /*  for(i=start_i; i<64; i++) {                           */
83    /*      sign     = (block[i]>>15)|1;                      */
84    /*      level    = ((abs(block[i])+bias[0])*qmat[i])>>16; */
85    /*      if (level < 0) level = 0;                         */
86    /*      max     |= level;                                 */
87    /*      level    = level * sign;                          */
88    /*      block[i] = level;                                 */
89    /*  } */
90
91    __asm__ volatile
92        ("i2=%1;\n\t"
93         "r1=[%1++];                                                         \n\t"
94         "r0=r1>>>15 (v);                                                    \n\t"
95         "lsetup (0f,1f) lc0=%3;                                             \n\t"
96         "0:   r0=r0|%4;                                                     \n\t"
97         "     r1=abs r1 (v)                                    || r2=[%2++];\n\t"
98         "     r1=r1+|+%5;                                                   \n\t"
99         "     r1=max(r1,%6) (v);                                            \n\t"
100         "     r1.h=(a1 =r1.h*r2.h), r1.l=(a0 =r1.l*r2.l) (tfu);             \n\t"
101         "     %0=%0|r1;                                                     \n\t"
102         "     r0.h=(a1 =r1.h*r0.h), r0.l=(a0 =r1.l*r0.l) (is)  || r1=[%1++];\n\t"
103         "1:   r0=r1>>>15 (v)                                   || [i2++]=r0;\n\t"
104         "r1=%0>>16;                                                         \n\t"
105         "%0=%0|r1;                                                          \n\t"
106         "%0.h=0;                                                            \n\t"
107         : "=&d" (max)
108         : "b" (block), "b" (qmat), "a" (32), "d" (0x00010001), "d" (bias[0]*0x10001), "d" (0)
109         : "R0","R1","R2", "I2");
110    if (start_i == 1) block[0] = dc;
111
112    EPROF();
113
114
115    PROF("zzscan",5);
116
117    __asm__ volatile
118        ("r0=b[%1--] (x);         \n\t"
119         "lsetup (0f,1f) lc0=%3;  \n\t"     /*    for(i=63; i>=start_i; i--) { */
120         "0: p0=r0;               \n\t"     /*        j = scantable[i];        */
121         "   p0=%2+(p0<<1);       \n\t"     /*        if (block[j]) {          */
122         "   r0=w[p0];            \n\t"     /*           last_non_zero = i;    */
123         "   cc=r0==0;            \n\t"     /*           break;                */
124         "   if !cc jump 2f;      \n\t"     /*        }                        */
125         "1: r0=b[%1--] (x);      \n\t"     /*    }                            */
126         "   %0=%4;               \n\t"
127         "   jump 3f;             \n\t"
128         "2: %0=lc0;              \n\t"
129         "3:\n\t"
130
131         : "=d" (last_non_zero)
132         : "a" (scantable+63), "a" (block), "a" (63), "d" (last_non_zero)
133         : "P0","R0");
134
135    EPROF();
136
137    *overflow= s->max_qcoeff < max; //overflow might have happened
138
139    bfprof();
140
141    /* we need this permutation so that we correct the IDCT, we only permute the !=0 elements */
142    if (s->dsp.idct_permutation_type != FF_NO_IDCT_PERM)
143        ff_block_permute(block, s->dsp.idct_permutation, scantable, last_non_zero);
144
145    return last_non_zero;
146}
147
148void MPV_common_init_bfin (MpegEncContext *s)
149{
150    s->dct_quantize= dct_quantize_bfin;
151}
152
153