Statistics
| Branch: | Revision:

ffmpeg / libavcodec / bfin / mpegvideo_bfin.c @ 2912e87a

History | View | Annotate | Download (5.37 KB)

1
/*
2
 * BlackFin MPEGVIDEO OPTIMIZATIONS
3
 *
4
 * Copyright (C) 2007 Marc Hoffman <mmh@pleasantst.com>
5
 *
6
 * This file is part of Libav.
7
 *
8
 * Libav 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
 * Libav 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 Libav; 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
static int dct_quantize_bfin (MpegEncContext *s,
29
                              DCTELEM *block, int n,
30
                              int qscale, int *overflow)
31
{
32
    int last_non_zero, q, start_i;
33
    const short *qmat;
34
    short *bias;
35
    const uint8_t *scantable= s->intra_scantable.scantable;
36
    short dc;
37
    int   max=0;
38

    
39
    PROF("fdct",0);
40
    s->dsp.fdct(block);
41
    EPROF();
42

    
43
    PROF("denoise",1);
44
    if(s->dct_error_sum)
45
        s->denoise_dct(s, block);
46
    EPROF();
47

    
48
    PROF("quant-init",2);
49
    if (s->mb_intra) {
50
        if (!s->h263_aic) {
51
            if (n < 4)
52
                q = s->y_dc_scale;
53
            else
54
                q = s->c_dc_scale;
55
            q = q << 3;
56
        } else
57
            /* For AIC we skip quant/dequant of INTRADC */
58
            q = 1 << 3;
59

    
60
        /* note: block[0] is assumed to be positive */
61
        dc = block[0] = (block[0] + (q >> 1)) / q;
62
        start_i = 1;
63
        last_non_zero = 0;
64
        bias = s->q_intra_matrix16[qscale][1];
65
        qmat = s->q_intra_matrix16[qscale][0];
66

    
67
    } else {
68
        start_i = 0;
69
        last_non_zero = -1;
70
        bias = s->q_inter_matrix16[qscale][1];
71
        qmat = s->q_inter_matrix16[qscale][0];
72

    
73
    }
74
    EPROF();
75

    
76
    PROF("quantize",4);
77

    
78
    /*  for(i=start_i; i<64; i++) {                           */
79
    /*      sign     = (block[i]>>15)|1;                      */
80
    /*      level    = ((abs(block[i])+bias[0])*qmat[i])>>16; */
81
    /*      if (level < 0) level = 0;                         */
82
    /*      max     |= level;                                 */
83
    /*      level    = level * sign;                          */
84
    /*      block[i] = level;                                 */
85
    /*  } */
86

    
87
    __asm__ volatile
88
        ("i2=%1;\n\t"
89
         "r1=[%1++];                                                         \n\t"
90
         "r0=r1>>>15 (v);                                                    \n\t"
91
         "lsetup (0f,1f) lc0=%3;                                             \n\t"
92
         "0:   r0=r0|%4;                                                     \n\t"
93
         "     r1=abs r1 (v)                                    || r2=[%2++];\n\t"
94
         "     r1=r1+|+%5;                                                   \n\t"
95
         "     r1=max(r1,%6) (v);                                            \n\t"
96
         "     r1.h=(a1 =r1.h*r2.h), r1.l=(a0 =r1.l*r2.l) (tfu);             \n\t"
97
         "     %0=%0|r1;                                                     \n\t"
98
         "     r0.h=(a1 =r1.h*r0.h), r0.l=(a0 =r1.l*r0.l) (is)  || r1=[%1++];\n\t"
99
         "1:   r0=r1>>>15 (v)                                   || [i2++]=r0;\n\t"
100
         "r1=%0>>16;                                                         \n\t"
101
         "%0=%0|r1;                                                          \n\t"
102
         "%0.h=0;                                                            \n\t"
103
         : "=&d" (max)
104
         : "b" (block), "b" (qmat), "a" (32), "d" (0x00010001), "d" (bias[0]*0x10001), "d" (0)
105
         : "R0","R1","R2", "I2");
106
    if (start_i == 1) block[0] = dc;
107

    
108
    EPROF();
109

    
110

    
111
    PROF("zzscan",5);
112

    
113
    __asm__ volatile
114
        ("r0=b[%1--] (x);         \n\t"
115
         "lsetup (0f,1f) lc0=%3;  \n\t"     /*    for(i=63; i>=start_i; i--) { */
116
         "0: p0=r0;               \n\t"     /*        j = scantable[i];        */
117
         "   p0=%2+(p0<<1);       \n\t"     /*        if (block[j]) {          */
118
         "   r0=w[p0];            \n\t"     /*           last_non_zero = i;    */
119
         "   cc=r0==0;            \n\t"     /*           break;                */
120
         "   if !cc jump 2f;      \n\t"     /*        }                        */
121
         "1: r0=b[%1--] (x);      \n\t"     /*    }                            */
122
         "   %0=%4;               \n\t"
123
         "   jump 3f;             \n\t"
124
         "2: %0=lc0;              \n\t"
125
         "3:\n\t"
126

    
127
         : "=d" (last_non_zero)
128
         : "a" (scantable+63), "a" (block), "a" (63), "d" (last_non_zero)
129
         : "P0","R0");
130

    
131
    EPROF();
132

    
133
    *overflow= s->max_qcoeff < max; //overflow might have happened
134

    
135
    bfprof();
136

    
137
    /* we need this permutation so that we correct the IDCT, we only permute the !=0 elements */
138
    if (s->dsp.idct_permutation_type != FF_NO_IDCT_PERM)
139
        ff_block_permute(block, s->dsp.idct_permutation, scantable, last_non_zero);
140

    
141
    return last_non_zero;
142
}
143

    
144
void MPV_common_init_bfin (MpegEncContext *s)
145
{
146
/*     s->dct_quantize= dct_quantize_bfin; */
147
}
148