| /* |
| * Copyright (c) 2000,2001 Fabrice Bellard |
| * |
| * MMI optimization by Leon van Stuivenberg |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavcodec/avcodec.h" |
| #include "libavcodec/dsputil.h" |
| #include "libavcodec/mpegvideo.h" |
| |
| static void dct_unquantize_h263_mmi(MpegEncContext *s, |
| DCTELEM *block, int n, int qscale) |
| { |
| int level=0, qmul, qadd; |
| int nCoeffs; |
| |
| assert(s->block_last_index[n]>=0); |
| |
| qadd = (qscale - 1) | 1; |
| qmul = qscale << 1; |
| |
| if (s->mb_intra) { |
| if (!s->h263_aic) { |
| if (n < 4) |
| level = block[0] * s->y_dc_scale; |
| else |
| level = block[0] * s->c_dc_scale; |
| }else { |
| qadd = 0; |
| level = block[0]; |
| } |
| nCoeffs= 63; //does not always use zigzag table |
| } else { |
| nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ]; |
| } |
| |
| __asm__ volatile( |
| "add $14, $0, %3 \n\t" |
| "pcpyld $8, %0, %0 \n\t" |
| "pcpyh $8, $8 \n\t" //r8 = qmul |
| "pcpyld $9, %1, %1 \n\t" |
| "pcpyh $9, $9 \n\t" //r9 = qadd |
| ".p2align 2 \n\t" |
| "1: \n\t" |
| "lq $10, 0($14) \n\t" //r10 = level |
| "addi $14, $14, 16 \n\t" //block+=8 |
| "addi %2, %2, -8 \n\t" |
| "pcgth $11, $0, $10 \n\t" //r11 = level < 0 ? -1 : 0 |
| "pcgth $12, $10, $0 \n\t" //r12 = level > 0 ? -1 : 0 |
| "por $12, $11, $12 \n\t" |
| "pmulth $10, $10, $8 \n\t" |
| "paddh $13, $9, $11 \n\t" |
| "pxor $13, $13, $11 \n\t" //r13 = level < 0 ? -qadd : qadd |
| "pmfhl.uw $11 \n\t" |
| "pinteh $10, $11, $10 \n\t" //r10 = level * qmul |
| "paddh $10, $10, $13 \n\t" |
| "pand $10, $10, $12 \n\t" |
| "sq $10, -16($14) \n\t" |
| "bgez %2, 1b \n\t" |
| :: "r"(qmul), "r" (qadd), "r" (nCoeffs), "r" (block) : "$8", "$9", "$10", "$11", "$12", "$13", "$14", "memory" ); |
| |
| if(s->mb_intra) |
| block[0]= level; |
| } |
| |
| |
| void MPV_common_init_mmi(MpegEncContext *s) |
| { |
| s->dct_unquantize_h263_intra = |
| s->dct_unquantize_h263_inter = dct_unquantize_h263_mmi; |
| } |
| |
| |