/* * Optimization of some functions from mpegvideo.c for armv5te * Copyright (c) 2007 Siarhei Siamashka * * 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" #ifdef ENABLE_ARM_TESTS /** * h263 dequantizer supplementary function, it is performance critical and needs to * have optimized implementations for each architecture. Is also used as a reference * implementation in regression tests */ static inline void dct_unquantize_h263_helper_c(DCTELEM *block, int qmul, int qadd, int count) { int i, level; for (i = 0; i < count; i++) { level = block[i]; if (level) { if (level < 0) { level = level * qmul - qadd; } else { level = level * qmul + qadd; } block[i] = level; } } } #endif /* GCC 3.1 or higher is required to support symbolic names in assembly code */ #if (__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 1)) /** * Special optimized version of dct_unquantize_h263_helper_c, it requires the block * to be at least 8 bytes aligned, and may process more elements than requested. * But it is guaranteed to never process more than 64 elements provided that * xxcount argument is <= 64, so it is safe. This macro is optimized for a common * distribution of values for nCoeffs (they are mostly multiple of 8 plus one or * two extra elements). So this macro processes data as 8 elements per loop iteration * and contains optional 2 elements processing in the end. * * Inner loop should take 6 cycles per element on arm926ej-s (Nokia 770) */ #define dct_unquantize_h263_special_helper_armv5te(xxblock, xxqmul, xxqadd, xxcount) \ ({ DCTELEM *xblock = xxblock; \ int xqmul = xxqmul, xqadd = xxqadd, xcount = xxcount, xtmp; \ int xdata1, xdata2; \ __asm__ __volatile__( \ "subs %[count], %[count], #2 \n\t" \ "ble 2f \n\t" \ "ldrd r4, [%[block], #0] \n\t" \ "1: \n\t" \ "ldrd r6, [%[block], #8] \n\t" \ \ "rsbs %[data1], %[zero], r4, asr #16 \n\t" \ "addgt %[data1], %[qadd], #0 \n\t" \ "rsblt %[data1], %[qadd], #0 \n\t" \ "smlatbne %[data1], r4, %[qmul], %[data1] \n\t" \ \ "rsbs %[data2], %[zero], r5, asr #16 \n\t" \ "addgt %[data2], %[qadd], #0 \n\t" \ "rsblt %[data2], %[qadd], #0 \n\t" \ "smlatbne %[data2], r5, %[qmul], %[data2] \n\t" \ \ "rsbs %[tmp], %[zero], r4, asl #16 \n\t" \ "addgt %[tmp], %[qadd], #0 \n\t" \ "rsblt %[tmp], %[qadd], #0 \n\t" \ "smlabbne r4, r4, %[qmul], %[tmp] \n\t" \ \ "rsbs %[tmp], %[zero], r5, asl #16 \n\t" \ "addgt %[tmp], %[qadd], #0 \n\t" \ "rsblt %[tmp], %[qadd], #0 \n\t" \ "smlabbne r5, r5, %[qmul], %[tmp] \n\t" \ \ "strh r4, [%[block]], #2 \n\t" \ "strh %[data1], [%[block]], #2 \n\t" \ "strh r5, [%[block]], #2 \n\t" \ "strh %[data2], [%[block]], #2 \n\t" \ \ "rsbs %[data1], %[zero], r6, asr #16 \n\t" \ "addgt %[data1], %[qadd], #0 \n\t" \ "rsblt %[data1], %[qadd], #0 \n\t" \ "smlatbne %[data1], r6, %[qmul], %[data1] \n\t" \ \ "rsbs %[data2], %[zero], r7, asr #16 \n\t" \ "addgt %[data2], %[qadd], #0 \n\t" \ "rsblt %[data2], %[qadd], #0 \n\t" \ "smlatbne %[data2], r7, %[qmul], %[data2] \n\t" \ \ "rsbs %[tmp], %[zero], r6, asl #16 \n\t" \ "addgt %[tmp], %[qadd], #0 \n\t" \ "rsblt %[tmp], %[qadd], #0 \n\t" \ "smlabbne r6, r6, %[qmul], %[tmp] \n\t" \ \ "rsbs %[tmp], %[zero], r7, asl #16 \n\t" \ "addgt %[tmp], %[qadd], #0 \n\t" \ "rsblt %[tmp], %[qadd], #0 \n\t" \ "smlabbne r7, r7, %[qmul], %[tmp] \n\t" \ \ "strh r6, [%[block]], #2 \n\t" \ "strh %[data1], [%[block]], #2 \n\t" \ "strh r7, [%[block]], #2 \n\t" \ "strh %[data2], [%[block]], #2 \n\t" \ \ "subs %[count], %[count], #8 \n\t" \ "ldrgtd r4, [%[block], #0] \n\t" /* load data early to avoid load/use pipeline stall */ \ "bgt 1b \n\t" \ \ "adds %[count], %[count], #2 \n\t" \ "ble 3f \n\t" \ "2: \n\t" \ "ldrsh %[data1], [%[block], #0] \n\t" \ "ldrsh %[data2], [%[block], #2] \n\t" \ "mov %[tmp], %[qadd] \n\t" \ "cmp %[data1], #0 \n\t" \ "rsblt %[tmp], %[qadd], #0 \n\t" \ "smlabbne %[data1], %[data1], %[qmul], %[tmp] \n\t" \ "mov %[tmp], %[qadd] \n\t" \ "cmp %[data2], #0 \n\t" \ "rsblt %[tmp], %[qadd], #0 \n\t" \ "smlabbne %[data2], %[data2], %[qmul], %[tmp] \n\t" \ "strh %[data1], [%[block]], #2 \n\t" \ "strh %[data2], [%[block]], #2 \n\t" \ "3: \n\t" \ : [block] "+&r" (xblock), [count] "+&r" (xcount), [tmp] "=&r" (xtmp), \ [data1] "=&r" (xdata1), [data2] "=&r" (xdata2) \ : [qmul] "r" (xqmul), [qadd] "r" (xqadd), [zero] "r" (0) \ : "r4", "r5", "r6", "r7", "cc", "memory" \ ); \ }) static void dct_unquantize_h263_intra_armv5te(MpegEncContext *s, DCTELEM *block, int n, int qscale) { int level, qmul, qadd; int nCoeffs; assert(s->block_last_index[n]>=0); qmul = qscale << 1; if (!s->h263_aic) { if (n < 4) level = block[0] * s->y_dc_scale; else level = block[0] * s->c_dc_scale; qadd = (qscale - 1) | 1; }else{ qadd = 0; level = block[0]; } if(s->ac_pred) nCoeffs=63; else nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ]; dct_unquantize_h263_special_helper_armv5te(block, qmul, qadd, nCoeffs + 1); block[0] = level; } static void dct_unquantize_h263_inter_armv5te(MpegEncContext *s, DCTELEM *block, int n, int qscale) { int qmul, qadd; int nCoeffs; assert(s->block_last_index[n]>=0); qadd = (qscale - 1) | 1; qmul = qscale << 1; nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ]; dct_unquantize_h263_special_helper_armv5te(block, qmul, qadd, nCoeffs + 1); } #define HAVE_DCT_UNQUANTIZE_H263_ARMV5TE_OPTIMIZED #endif void MPV_common_init_armv5te(MpegEncContext *s) { #ifdef HAVE_DCT_UNQUANTIZE_H263_ARMV5TE_OPTIMIZED s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_armv5te; s->dct_unquantize_h263_inter = dct_unquantize_h263_inter_armv5te; #endif }