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