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88 lines
2.4 KiB
88 lines
2.4 KiB
/* |
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* Alpha optimized DSP utils |
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* Copyright (c) 2002 Falk Hueffner <falk@debian.org> |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "asm.h" |
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#include "../dsputil.h" |
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#include "../mpegvideo.h" |
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extern UINT8 zigzag_end[64]; |
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static void dct_unquantize_h263_axp(MpegEncContext *s, |
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DCTELEM *block, int n, int qscale) |
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{ |
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int i, level; |
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UINT64 qmul, qadd; |
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if (s->mb_intra) { |
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if (n < 4) |
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block[0] = block[0] * s->y_dc_scale; |
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else |
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block[0] = block[0] * s->c_dc_scale; |
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/* Catch up to aligned point. */ |
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qmul = s->qscale << 1; |
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qadd = (s->qscale - 1) | 1; |
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for (i = 1; i < 4; ++i) { |
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level = block[i]; |
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if (level) { |
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if (level < 0) { |
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level = level * qmul - qadd; |
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} else { |
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level = level * qmul + qadd; |
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} |
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block[i] = level; |
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} |
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} |
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block += 4; |
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i = 60 / 4; |
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} else { |
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i = zigzag_end[s->block_last_index[n]] / 4; |
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} |
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qmul = s->qscale << 1; |
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qadd = WORD_VEC((qscale - 1) | 1); |
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do { |
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UINT64 levels, negmask, zeromask, corr; |
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levels = ldq(block); |
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if (levels == 0) |
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continue; |
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zeromask = cmpbge(0, levels); |
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zeromask &= zeromask >> 1; |
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/* Negate all negative words. */ |
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negmask = maxsw4(levels, WORD_VEC(0xffff)); /* negative -> ffff (-1) */ |
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negmask = minsw4(negmask, 0); /* positive -> 0000 (0) */ |
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corr = negmask & WORD_VEC(0x0001); /* twos-complement correction */ |
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levels ^= negmask; |
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levels += corr; |
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levels = levels * qmul; |
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levels += zap(qadd, zeromask); |
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/* Re-negate negative words. */ |
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levels -= corr; |
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levels ^= negmask; |
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stq(levels, block); |
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} while (block += 4, --i); |
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} |
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void MPV_common_init_axp(MpegEncContext *s) |
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{ |
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if (amask(AMASK_MVI) == 0) { |
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if (s->out_format == FMT_H263) |
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s->dct_unquantize = dct_unquantize_h263_axp; |
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} |
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}
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