c21fe7d1434666ffc93c01334aa33986f1bc0705
[libav.git] / libavcodec / ps2 / mpegvideo_mmi.c
1 /*
2 * Copyright (c) 2000,2001 Fabrice Bellard.
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * MMI optimization by Leon van Stuivenberg
21 */
22
23 #include "../dsputil.h"
24 #include "../mpegvideo.h"
25 #include "../avcodec.h"
26
27 static void dct_unquantize_h263_mmi(MpegEncContext *s,
28 DCTELEM *block, int n, int qscale)
29 {
30 int level=0, qmul, qadd;
31 int nCoeffs;
32
33 assert(s->block_last_index[n]>=0);
34
35 qadd = (qscale - 1) | 1;
36 qmul = qscale << 1;
37
38 if (s->mb_intra) {
39 if (!s->h263_aic) {
40 if (n < 4)
41 level = block[0] * s->y_dc_scale;
42 else
43 level = block[0] * s->c_dc_scale;
44 }else {
45 qadd = 0;
46 level = block[0];
47 }
48 nCoeffs= 63; //does not always use zigzag table
49 } else {
50 nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
51 }
52
53 asm volatile(
54 "add $14, $0, %3 \n\t"
55 "pcpyld $8, %0, %0 \n\t"
56 "pcpyh $8, $8 \n\t" //r8 = qmul
57 "pcpyld $9, %1, %1 \n\t"
58 "pcpyh $9, $9 \n\t" //r9 = qadd
59 ".p2align 2 \n\t"
60 "1: \n\t"
61 "lq $10, 0($14) \n\t" //r10 = level
62 "addi $14, $14, 16 \n\t" //block+=8
63 "addi %2, %2, -8 \n\t"
64 "pcgth $11, $0, $10 \n\t" //r11 = level < 0 ? -1 : 0
65 "pcgth $12, $10, $0 \n\t" //r12 = level > 0 ? -1 : 0
66 "por $12, $11, $12 \n\t"
67 "pmulth $10, $10, $8 \n\t"
68 "paddh $13, $9, $11 \n\t"
69 "pxor $13, $13, $11 \n\t" //r13 = level < 0 ? -qadd : qadd
70 "pmfhl.uw $11 \n\t"
71 "pinteh $10, $11, $10 \n\t" //r10 = level * qmul
72 "paddh $10, $10, $13 \n\t"
73 "pand $10, $10, $12 \n\t"
74 "sq $10, -16($14) \n\t"
75 "bgez %2, 1b \n\t"
76 :: "r"(qmul), "r" (qadd), "r" (nCoeffs), "r" (block) : "$8", "$9", "$10", "$11", "$12", "$13", "$14", "memory" );
77
78 if(s->mb_intra)
79 block[0]= level;
80 }
81
82
83 void MPV_common_init_mmi(MpegEncContext *s)
84 {
85 s->dct_unquantize_h263_intra =
86 s->dct_unquantize_h263_inter = dct_unquantize_h263_mmi;
87 }
88
89