| /* |
| * Alpha optimized DSP utils |
| * Copyright (c) 2002 Falk Hueffner <falk@debian.org> |
| * |
| * 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/dsputil.h" |
| #include "libavcodec/mpegvideo.h" |
| #include "asm.h" |
| |
| static void dct_unquantize_h263_axp(DCTELEM *block, int n_coeffs, |
| uint64_t qscale, uint64_t qadd) |
| { |
| uint64_t qmul = qscale << 1; |
| uint64_t correction = WORD_VEC(qmul * 255 >> 8); |
| int i; |
| |
| qadd = WORD_VEC(qadd); |
| |
| for(i = 0; i <= n_coeffs; block += 4, i += 4) { |
| uint64_t levels, negmask, zeros, add, sub; |
| |
| levels = ldq(block); |
| if (levels == 0) |
| continue; |
| |
| #ifdef __alpha_max__ |
| /* I don't think the speed difference justifies runtime |
| detection. */ |
| negmask = maxsw4(levels, -1); /* negative -> ffff (-1) */ |
| negmask = minsw4(negmask, 0); /* positive -> 0000 (0) */ |
| #else |
| negmask = cmpbge(WORD_VEC(0x7fff), levels); |
| negmask &= (negmask >> 1) | (1 << 7); |
| negmask = zap(-1, negmask); |
| #endif |
| |
| zeros = cmpbge(0, levels); |
| zeros &= zeros >> 1; |
| /* zeros |= zeros << 1 is not needed since qadd <= 255, so |
| zapping the lower byte suffices. */ |
| |
| levels *= qmul; |
| levels -= correction & (negmask << 16); |
| |
| add = qadd & ~negmask; |
| sub = qadd & negmask; |
| /* Set qadd to 0 for levels == 0. */ |
| add = zap(add, zeros); |
| levels += add; |
| levels -= sub; |
| |
| stq(levels, block); |
| } |
| } |
| |
| static void dct_unquantize_h263_intra_axp(MpegEncContext *s, DCTELEM *block, |
| int n, int qscale) |
| { |
| int n_coeffs; |
| uint64_t qadd; |
| DCTELEM block0 = block[0]; |
| |
| if (!s->h263_aic) { |
| if (n < 4) |
| block0 *= s->y_dc_scale; |
| else |
| block0 *= s->c_dc_scale; |
| qadd = (qscale - 1) | 1; |
| } else { |
| qadd = 0; |
| } |
| |
| if(s->ac_pred) |
| n_coeffs = 63; |
| else |
| n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]]; |
| |
| dct_unquantize_h263_axp(block, n_coeffs, qscale, qadd); |
| |
| block[0] = block0; |
| } |
| |
| static void dct_unquantize_h263_inter_axp(MpegEncContext *s, DCTELEM *block, |
| int n, int qscale) |
| { |
| int n_coeffs = s->inter_scantable.raster_end[s->block_last_index[n]]; |
| dct_unquantize_h263_axp(block, n_coeffs, qscale, (qscale - 1) | 1); |
| } |
| |
| void MPV_common_init_axp(MpegEncContext *s) |
| { |
| s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_axp; |
| s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_axp; |
| } |