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Blackfin dct_quantize_bfin routine

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2x performance boost in performing quantization for mpeg encoding

Originally committed as revision 9293 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Marc Hoffman 2007-06-12 19:13:50 +00:00
parent ea6ad30ce9
commit 50ee61dda2
2 changed files with 220 additions and 0 deletions
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68
libavcodec/bfin/dsputil_bfin.h Normal file
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/*
* BlackFin DSPUTILS COMMON OPTIMIZATIONS HEADER
*
* Copyright (C) 2007 Marc Hoffman <mmh@pleasantst.com>
*
* 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
*/
#ifndef DSPUTIL_BFIN_H
#define DSPUTIL_BFIN_H
#define attribute_l1_text __attribute__ ((l1_text))
#ifdef BFIN_PROFILE
static double Telem[16];
static char *TelemNames[16];
static int TelemCnt;
#define PROF(lab,e) { int __e = e; char*__lab = lab; uint64_t _t0 = read_time();
#define EPROF() _t0 = read_time()-_t0; Telem[__e] = Telem[__e] + _t0; TelemNames[__e] = __lab; }
static void prof_report (void)
{
int i;
double s = 0;
for (i=0;i<16;i++) {
double v;
if (TelemNames[i]) {
v = Telem[i]/TelemCnt;
av_log (NULL,AV_LOG_DEBUG,"%-20s: %12.4f\t%12.4f\n", TelemNames[i],v,v/64);
s = s + Telem[i];
}
}
av_log (NULL,AV_LOG_DEBUG,"%-20s: %12.4f\t%12.4f\n%20.4f\t%d\n",
"total",s/TelemCnt,s/TelemCnt/64,s,TelemCnt);
}
static void bfprof (void)
{
static int init;
if (!init) atexit (prof_report);
init=1;
TelemCnt++;
}
#else
#define PROF(a,b)
#define EPROF()
#define bfprof()
#endif
#endif

152
libavcodec/bfin/mpegvideo_bfin.c Normal file
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/*
* BlackFin MPEGVIDEO OPTIMIZATIONS
*
* Copyright (C) 2007 Marc Hoffman <mmh@pleasantst.com>
*
* 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 "dsputil.h"
#include "mpegvideo.h"
#include "avcodec.h"
#include "dsputil_bfin.h"
extern void ff_bfin_fdct (DCTELEM *block) attribute_l1_text;
static int dct_quantize_bfin (MpegEncContext *s,
DCTELEM *block, int n,
int qscale, int *overflow)
{
int last_non_zero, q, start_i;
const short *qmat;
short *bias;
const uint8_t *scantable= s->intra_scantable.scantable;
short dc;
int max=0;
PROF("fdct",0);
ff_bfin_fdct (block);
EPROF();
PROF("denoise",1);
if(s->dct_error_sum)
s->denoise_dct(s, block);
EPROF();
PROF("quant-init",2);
if (s->mb_intra) {
if (!s->h263_aic) {
if (n < 4)
q = s->y_dc_scale;
else
q = s->c_dc_scale;
q = q << 3;
} else
/* For AIC we skip quant/dequant of INTRADC */
q = 1 << 3;
/* note: block[0] is assumed to be positive */
dc = block[0] = (block[0] + (q >> 1)) / q;
start_i = 1;
last_non_zero = 0;
bias = s->q_intra_matrix16[qscale][1];
qmat = s->q_intra_matrix16[qscale][0];
} else {
start_i = 0;
last_non_zero = -1;
bias = s->q_inter_matrix16[qscale][1];
qmat = s->q_inter_matrix16[qscale][0];
}
EPROF();
PROF("quantize",4);
/* for(i=start_i; i<64; i++) { */
/* sign = (block[i]>>15)|1; */
/* level = ((abs(block[i])+bias[0])*qmat[i])>>16; */
/* if (level < 0) level = 0; */
/* max |= level; */
/* level = level * sign; */
/* block[i] = level; */
/* } */
asm volatile
("i2=%1;\n\t"
"r1=[%1++]; \n\t"
"r0=r1>>>15 (v); \n\t"
"lsetup (0f,1f) lc0=%3; \n\t"
"0: r0=r0|%4; \n\t"
" r1=abs r1 (v) || r2=[%2++];\n\t"
" r1=r1+|+%5; \n\t"
" r1=max(r1,%6) (v); \n\t"
" r1.h=(a1 =r1.h*r2.h), r1.l=(a0 =r1.l*r2.l) (tfu); \n\t"
" %0=%0|r1; \n\t"
" r0.h=(a1 =r1.h*r0.h), r0.l=(a0 =r1.l*r0.l) (is) || r1=[%1++];\n\t"
"1: r0=r1>>>15 (v) || [i2++]=r0;\n\t"
"r1=%0>>16; \n\t"
"%0=%0|r1; \n\t"
"%0.h=0; \n\t"
: "=&d" (max)
: "b" (block), "b" (qmat), "a" (32), "d" (0x00010001), "d" (bias[0]*0x10001), "d" (0)
: "R0","R1","R2", "I2");
if (start_i == 1) block[0] = dc;
EPROF();
PROF("zzscan",5);
asm volatile
("r0=b[%1--] (x); \n\t"
"lsetup (0f,1f) lc0=%3; \n\t" /* for(i=63; i>=start_i; i--) { */
"0: p0=r0; \n\t" /* j = scantable[i]; */
" p0=%2+(p0<<1); \n\t" /* if (block[j]) { */
" r0=w[p0]; \n\t" /* last_non_zero = i; */
" cc=r0==0; \n\t" /* break; */
" if !cc jump 2f; \n\t" /* } */
"1: r0=b[%1--] (x); \n\t" /* } */
" %0=%4; \n\t"
" jump 3f; \n\t"
"2: %0=lc0; \n\t"
"3:\n\t"
: "=d" (last_non_zero)
: "a" (scantable+63), "a" (block), "a" (63), "d" (last_non_zero)
: "P0","R0");
EPROF();
*overflow= s->max_qcoeff < max; //overflow might have happened
bfprof();
/* we need this permutation so that we correct the IDCT, we only permute the !=0 elements */
if (s->dsp.idct_permutation_type != FF_NO_IDCT_PERM)
ff_block_permute(block, s->dsp.idct_permutation, scantable, last_non_zero);
return last_non_zero;
}
void MPV_common_init_bfin (MpegEncContext *s)
{
s->dct_quantize= dct_quantize_bfin;
}