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110 lines
3.3 KiB
110 lines
3.3 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 file is part of FFmpeg. |
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* |
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* FFmpeg 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 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg 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 FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/attributes.h" |
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#include "libavcodec/mpegvideo.h" |
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#include "asm.h" |
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static void dct_unquantize_h263_axp(int16_t *block, int n_coeffs, |
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uint64_t qscale, uint64_t qadd) |
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{ |
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uint64_t qmul = qscale << 1; |
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uint64_t correction = WORD_VEC(qmul * 255 >> 8); |
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int i; |
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qadd = WORD_VEC(qadd); |
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for(i = 0; i <= n_coeffs; block += 4, i += 4) { |
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uint64_t levels, negmask, zeros, add, sub; |
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levels = ldq(block); |
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if (levels == 0) |
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continue; |
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#ifdef __alpha_max__ |
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/* I don't think the speed difference justifies runtime |
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detection. */ |
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negmask = maxsw4(levels, -1); /* negative -> ffff (-1) */ |
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negmask = minsw4(negmask, 0); /* positive -> 0000 (0) */ |
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#else |
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negmask = cmpbge(WORD_VEC(0x7fff), levels); |
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negmask &= (negmask >> 1) | (1 << 7); |
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negmask = zap(-1, negmask); |
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#endif |
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zeros = cmpbge(0, levels); |
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zeros &= zeros >> 1; |
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/* zeros |= zeros << 1 is not needed since qadd <= 255, so |
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zapping the lower byte suffices. */ |
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levels *= qmul; |
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levels -= correction & (negmask << 16); |
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add = qadd & ~negmask; |
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sub = qadd & negmask; |
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/* Set qadd to 0 for levels == 0. */ |
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add = zap(add, zeros); |
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levels += add; |
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levels -= sub; |
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stq(levels, block); |
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} |
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} |
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static void dct_unquantize_h263_intra_axp(MpegEncContext *s, int16_t *block, |
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int n, int qscale) |
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{ |
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int n_coeffs; |
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uint64_t qadd; |
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int16_t block0 = block[0]; |
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if (!s->h263_aic) { |
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if (n < 4) |
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block0 *= s->y_dc_scale; |
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else |
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block0 *= s->c_dc_scale; |
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qadd = (qscale - 1) | 1; |
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} else { |
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qadd = 0; |
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} |
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if(s->ac_pred) |
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n_coeffs = 63; |
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else |
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n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]]; |
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dct_unquantize_h263_axp(block, n_coeffs, qscale, qadd); |
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block[0] = block0; |
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} |
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static void dct_unquantize_h263_inter_axp(MpegEncContext *s, int16_t *block, |
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int n, int qscale) |
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{ |
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int n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]]; |
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dct_unquantize_h263_axp(block, n_coeffs, qscale, (qscale - 1) | 1); |
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} |
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av_cold void ff_MPV_common_init_axp(MpegEncContext *s) |
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{ |
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s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_axp; |
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s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_axp; |
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}
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