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mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-07 11:13:41 +02:00
FFmpeg/libavcodec/alpha/mpegvideo_alpha.c
Michael Niedermayer 6cb2085278 Merge remote-tracking branch 'qatar/master'
* qatar/master: (27 commits)
  ppc: Add ff_ prefix to nonstatic symbols
  sh4: Add ff_ prefix to nonstatic symbols
  mpegvideo: Add ff_ prefix to nonstatic functions
  rtjpeg: Add ff_ prefix to nonstatic symbols
  rv: Add ff_ prefix to nonstatic symbols
  vp56: Add ff_ prefix to nonstatic symbols
  vorbis: Add ff_ prefix to nonstatic symbols
  msmpeg4: Add ff_ prefix to nonstatic symbols
  vc1: Add ff_ prefix to nonstatic symbols
  msmpeg4: Add ff_ prefixes to nonstatic symbols
  snow: Add ff_ prefix to nonstatic symbols
  mpeg12: Add ff_ prefix to nonstatic symbols
  mpeg4: Add ff_ prefixes to nonstatic symbols
  lagarith: Add ff_ prefix to lag_rac_init
  libavcodec: Add ff_ prefix to j_rev_dct*
  dsputil: Add ff_ prefix to inv_zigzag_direct16
  libavcodec: Prefix fdct_ifast, fdct_ifast248
  dsputil: Add ff_ prefix to the dsputil*_init* functions
  libavcodec: Add ff_ prefix to some nonstatic symbols
  vlc/rl: Add ff_ prefix to the nonstatic symbols
  ...

Conflicts:
	libavcodec/Makefile
	libavcodec/allcodecs.c
	libavcodec/dnxhddec.c
	libavcodec/ffv1.c
	libavcodec/h263.h
	libavcodec/h263dec.c
	libavcodec/h264.c
	libavcodec/mpegvideo.c
	libavcodec/mpegvideo_enc.c
	libavcodec/nuv.c
	libavcodec/ppc/dsputil_ppc.c
	libavcodec/proresdsp.c
	libavcodec/svq3.c
	libavcodec/version.h
	libavformat/dv.h
	libavformat/dvenc.c
	libavformat/matroskadec.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-02-16 01:34:37 +01:00

111 lines
3.2 KiB
C

/*
* 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 ff_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;
}