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libavcodec
arm
mpegvideo_iwmmxt.c
Go to the documentation of this file.
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/*
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* copyright (c) 2004 AGAWA Koji
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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/cpu.h
"
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#include "
libavcodec/avcodec.h
"
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#include "
libavcodec/dsputil.h
"
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#include "
libavcodec/mpegvideo.h
"
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#include "
mpegvideo_arm.h
"
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static
void
dct_unquantize_h263_intra_iwmmxt
(
MpegEncContext
*s,
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DCTELEM
*
block
,
int
n,
int
qscale)
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{
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int
level
, qmul, qadd;
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int
nCoeffs;
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DCTELEM
*block_orig =
block
;
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assert(s->
block_last_index
[n]>=0);
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qmul = qscale << 1;
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if
(!s->
h263_aic
) {
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if
(n < 4)
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level = block[0] * s->
y_dc_scale
;
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else
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level = block[0] * 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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level = block[0];
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}
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if
(s->
ac_pred
)
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nCoeffs=63;
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else
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nCoeffs= s->
inter_scantable
.
raster_end
[ s->
block_last_index
[n] ];
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__asm__
volatile
(
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/* "movd %1, %%mm6 \n\t" //qmul */
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/* "packssdw %%mm6, %%mm6 \n\t" */
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/* "packssdw %%mm6, %%mm6 \n\t" */
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"tbcsth wr6, %[qmul] \n\t"
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/* "movd %2, %%mm5 \n\t" //qadd */
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/* "packssdw %%mm5, %%mm5 \n\t" */
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/* "packssdw %%mm5, %%mm5 \n\t" */
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"tbcsth wr5, %[qadd] \n\t"
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"wzero wr7 \n\t"
/* "pxor %%mm7, %%mm7 \n\t" */
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"wzero wr4 \n\t"
/* "pxor %%mm4, %%mm4 \n\t" */
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"wsubh wr7, wr5, wr7 \n\t"
/* "psubw %%mm5, %%mm7 \n\t" */
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"1: \n\t"
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"wldrd wr2, [%[block]] \n\t"
/* "movq (%0, %3), %%mm0 \n\t" */
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"wldrd wr3, [%[block], #8] \n\t"
/* "movq 8(%0, %3), %%mm1 \n\t" */
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"wmulsl wr0, wr6, wr2 \n\t"
/* "pmullw %%mm6, %%mm0 \n\t" */
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"wmulsl wr1, wr6, wr3 \n\t"
/* "pmullw %%mm6, %%mm1 \n\t" */
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/* "movq (%0, %3), %%mm2 \n\t" */
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/* "movq 8(%0, %3), %%mm3 \n\t" */
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"wcmpgtsh wr2, wr4, wr2 \n\t"
/* "pcmpgtw %%mm4, %%mm2 \n\t" // block[i] < 0 ? -1 : 0 */
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"wcmpgtsh wr3, wr4, wr2 \n\t"
/* "pcmpgtw %%mm4, %%mm3 \n\t" // block[i] < 0 ? -1 : 0 */
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"wxor wr0, wr2, wr0 \n\t"
/* "pxor %%mm2, %%mm0 \n\t" */
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"wxor wr1, wr3, wr1 \n\t"
/* "pxor %%mm3, %%mm1 \n\t" */
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"waddh wr0, wr7, wr0 \n\t"
/* "paddw %%mm7, %%mm0 \n\t" */
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"waddh wr1, wr7, wr1 \n\t"
/* "paddw %%mm7, %%mm1 \n\t" */
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"wxor wr2, wr0, wr2 \n\t"
/* "pxor %%mm0, %%mm2 \n\t" */
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"wxor wr3, wr1, wr3 \n\t"
/* "pxor %%mm1, %%mm3 \n\t" */
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"wcmpeqh wr0, wr7, wr0 \n\t"
/* "pcmpeqw %%mm7, %%mm0 \n\t" // block[i] == 0 ? -1 : 0 */
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"wcmpeqh wr1, wr7, wr1 \n\t"
/* "pcmpeqw %%mm7, %%mm1 \n\t" // block[i] == 0 ? -1 : 0 */
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"wandn wr0, wr2, wr0 \n\t"
/* "pandn %%mm2, %%mm0 \n\t" */
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"wandn wr1, wr3, wr1 \n\t"
/* "pandn %%mm3, %%mm1 \n\t" */
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"wstrd wr0, [%[block]] \n\t"
/* "movq %%mm0, (%0, %3) \n\t" */
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"wstrd wr1, [%[block], #8] \n\t"
/* "movq %%mm1, 8(%0, %3) \n\t" */
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"add %[block], %[block], #16 \n\t"
/* "addl $16, %3 \n\t" */
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"subs %[i], %[i], #1 \n\t"
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"bne 1b \n\t"
/* "jng 1b \n\t" */
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:[
block
]
"+r"
(
block
)
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:[i]
"r"
((nCoeffs + 8) / 8), [qmul]
"r"
(qmul), [qadd]
"r"
(qadd)
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:
"memory"
);
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block_orig[0] =
level
;
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}
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void
MPV_common_init_iwmmxt
(
MpegEncContext
*s)
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{
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if
(!(mm_flags &
AV_CPU_FLAG_IWMMXT
))
return
;
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s->
dct_unquantize_h263_intra
=
dct_unquantize_h263_intra_iwmmxt
;
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}