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[libav.git] / libavcodec / ps2 / mpegvideo_mmi.c
1 /*
2 * Copyright (c) 2000,2001 Fabrice Bellard.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * MMI optimization by Leon van Stuivenberg
19 */
20
21 #include "../dsputil.h"
22 #include "../mpegvideo.h"
23 #include "../avcodec.h"
24
25 static void dct_unquantize_h263_mmi(MpegEncContext *s,
26 DCTELEM *block, int n, int qscale)
27 {
28 int level=0, qmul, qadd;
29 int nCoeffs;
30
31 assert(s->block_last_index[n]>=0);
32
33 qadd = (qscale - 1) | 1;
34 qmul = qscale << 1;
35
36 if (s->mb_intra) {
37 if (!s->h263_aic) {
38 if (n < 4)
39 level = block[0] * s->y_dc_scale;
40 else
41 level = block[0] * s->c_dc_scale;
42 }else {
43 qadd = 0;
44 level = block[0];
45 }
46 nCoeffs= 63; //does not allways use zigzag table
47 } else {
48 nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ];
49 }
50
51 asm volatile(
52 "add $14, $0, %3 \n\t"
53 "pcpyld $8, %0, %0 \n\t"
54 "pcpyh $8, $8 \n\t" //r8 = qmul
55 "pcpyld $9, %1, %1 \n\t"
56 "pcpyh $9, $9 \n\t" //r9 = qadd
57 ".p2align 2 \n\t"
58 "1: \n\t"
59 "lq $10, 0($14) \n\t" //r10 = level
60 "addi $14, $14, 16 \n\t" //block+=8
61 "addi %2, %2, -8 \n\t"
62 "pcgth $11, $0, $10 \n\t" //r11 = level < 0 ? -1 : 0
63 "pcgth $12, $10, $0 \n\t" //r12 = level > 0 ? -1 : 0
64 "por $12, $11, $12 \n\t"
65 "pmulth $10, $10, $8 \n\t"
66 "paddh $13, $9, $11 \n\t"
67 "pxor $13, $13, $11 \n\t" //r13 = level < 0 ? -qadd : qadd
68 "pmfhl.uw $11 \n\t"
69 "pinteh $10, $11, $10 \n\t" //r10 = level * qmul
70 "paddh $10, $10, $13 \n\t"
71 "pand $10, $10, $12 \n\t"
72 "sq $10, -16($14) \n\t"
73 "bgez %2, 1b \n\t"
74 :: "r"(qmul), "r" (qadd), "r" (nCoeffs), "r" (block) : "$8", "$9", "$10", "$11", "$12", "$13", "$14", "memory" );
75
76 if(s->mb_intra)
77 block[0]= level;
78 }
79
80
81 void MPV_common_init_mmi(MpegEncContext *s)
82 {
83 s->dct_unquantize_h263_intra =
84 s->dct_unquantize_h263_inter = dct_unquantize_h263_mmi;
85 }
86
87