[FFmpeg-devel] [PATCH 05/15] Move the functions in h264idct into a new file h264idct_internal.h.
Oskar Arvidsson
arvidsson.oskar
Thu Mar 10 23:27:37 CET 2011
Preparatory patch for high bit depth h264 decoding support.
---
libavcodec/h264idct.c | 249 +-----------------------------------
libavcodec/h264idct_internal.h | 278 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 279 insertions(+), 248 deletions(-)
create mode 100644 libavcodec/h264idct_internal.h
diff --git a/libavcodec/h264idct.c b/libavcodec/h264idct.c
index 7c96f42..4a0fd1b 100644
--- a/libavcodec/h264idct.c
+++ b/libavcodec/h264idct.c
@@ -25,251 +25,4 @@
* @author Michael Niedermayer <michaelni at gmx.at>
*/
-#include "dsputil.h"
-
-static av_always_inline void idct_internal(uint8_t *dst, DCTELEM *block, int stride, int block_stride, int shift, int add){
- int i;
- uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
-
- block[0] += 1<<(shift-1);
-
- for(i=0; i<4; i++){
- const int z0= block[i + block_stride*0] + block[i + block_stride*2];
- const int z1= block[i + block_stride*0] - block[i + block_stride*2];
- const int z2= (block[i + block_stride*1]>>1) - block[i + block_stride*3];
- const int z3= block[i + block_stride*1] + (block[i + block_stride*3]>>1);
-
- block[i + block_stride*0]= z0 + z3;
- block[i + block_stride*1]= z1 + z2;
- block[i + block_stride*2]= z1 - z2;
- block[i + block_stride*3]= z0 - z3;
- }
-
- for(i=0; i<4; i++){
- const int z0= block[0 + block_stride*i] + block[2 + block_stride*i];
- const int z1= block[0 + block_stride*i] - block[2 + block_stride*i];
- const int z2= (block[1 + block_stride*i]>>1) - block[3 + block_stride*i];
- const int z3= block[1 + block_stride*i] + (block[3 + block_stride*i]>>1);
-
- dst[i + 0*stride]= cm[ add*dst[i + 0*stride] + ((z0 + z3) >> shift) ];
- dst[i + 1*stride]= cm[ add*dst[i + 1*stride] + ((z1 + z2) >> shift) ];
- dst[i + 2*stride]= cm[ add*dst[i + 2*stride] + ((z1 - z2) >> shift) ];
- dst[i + 3*stride]= cm[ add*dst[i + 3*stride] + ((z0 - z3) >> shift) ];
- }
-}
-
-void ff_h264_idct_add_c(uint8_t *dst, DCTELEM *block, int stride){
- idct_internal(dst, block, stride, 4, 6, 1);
-}
-
-void ff_h264_lowres_idct_add_c(uint8_t *dst, int stride, DCTELEM *block){
- idct_internal(dst, block, stride, 8, 3, 1);
-}
-
-void ff_h264_lowres_idct_put_c(uint8_t *dst, int stride, DCTELEM *block){
- idct_internal(dst, block, stride, 8, 3, 0);
-}
-
-void ff_h264_idct8_add_c(uint8_t *dst, DCTELEM *block, int stride){
- int i;
- uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
-
- block[0] += 32;
-
- for( i = 0; i < 8; i++ )
- {
- const int a0 = block[i+0*8] + block[i+4*8];
- const int a2 = block[i+0*8] - block[i+4*8];
- const int a4 = (block[i+2*8]>>1) - block[i+6*8];
- const int a6 = (block[i+6*8]>>1) + block[i+2*8];
-
- const int b0 = a0 + a6;
- const int b2 = a2 + a4;
- const int b4 = a2 - a4;
- const int b6 = a0 - a6;
-
- const int a1 = -block[i+3*8] + block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1);
- const int a3 = block[i+1*8] + block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1);
- const int a5 = -block[i+1*8] + block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1);
- const int a7 = block[i+3*8] + block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1);
-
- const int b1 = (a7>>2) + a1;
- const int b3 = a3 + (a5>>2);
- const int b5 = (a3>>2) - a5;
- const int b7 = a7 - (a1>>2);
-
- block[i+0*8] = b0 + b7;
- block[i+7*8] = b0 - b7;
- block[i+1*8] = b2 + b5;
- block[i+6*8] = b2 - b5;
- block[i+2*8] = b4 + b3;
- block[i+5*8] = b4 - b3;
- block[i+3*8] = b6 + b1;
- block[i+4*8] = b6 - b1;
- }
- for( i = 0; i < 8; i++ )
- {
- const int a0 = block[0+i*8] + block[4+i*8];
- const int a2 = block[0+i*8] - block[4+i*8];
- const int a4 = (block[2+i*8]>>1) - block[6+i*8];
- const int a6 = (block[6+i*8]>>1) + block[2+i*8];
-
- const int b0 = a0 + a6;
- const int b2 = a2 + a4;
- const int b4 = a2 - a4;
- const int b6 = a0 - a6;
-
- const int a1 = -block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1);
- const int a3 = block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1);
- const int a5 = -block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1);
- const int a7 = block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1);
-
- const int b1 = (a7>>2) + a1;
- const int b3 = a3 + (a5>>2);
- const int b5 = (a3>>2) - a5;
- const int b7 = a7 - (a1>>2);
-
- dst[i + 0*stride] = cm[ dst[i + 0*stride] + ((b0 + b7) >> 6) ];
- dst[i + 1*stride] = cm[ dst[i + 1*stride] + ((b2 + b5) >> 6) ];
- dst[i + 2*stride] = cm[ dst[i + 2*stride] + ((b4 + b3) >> 6) ];
- dst[i + 3*stride] = cm[ dst[i + 3*stride] + ((b6 + b1) >> 6) ];
- dst[i + 4*stride] = cm[ dst[i + 4*stride] + ((b6 - b1) >> 6) ];
- dst[i + 5*stride] = cm[ dst[i + 5*stride] + ((b4 - b3) >> 6) ];
- dst[i + 6*stride] = cm[ dst[i + 6*stride] + ((b2 - b5) >> 6) ];
- dst[i + 7*stride] = cm[ dst[i + 7*stride] + ((b0 - b7) >> 6) ];
- }
-}
-
-// assumes all AC coefs are 0
-void ff_h264_idct_dc_add_c(uint8_t *dst, DCTELEM *block, int stride){
- int i, j;
- int dc = (block[0] + 32) >> 6;
- uint8_t *cm = ff_cropTbl + MAX_NEG_CROP + dc;
- for( j = 0; j < 4; j++ )
- {
- for( i = 0; i < 4; i++ )
- dst[i] = cm[ dst[i] ];
- dst += stride;
- }
-}
-
-void ff_h264_idct8_dc_add_c(uint8_t *dst, DCTELEM *block, int stride){
- int i, j;
- int dc = (block[0] + 32) >> 6;
- uint8_t *cm = ff_cropTbl + MAX_NEG_CROP + dc;
- for( j = 0; j < 8; j++ )
- {
- for( i = 0; i < 8; i++ )
- dst[i] = cm[ dst[i] ];
- dst += stride;
- }
-}
-
-//FIXME this table is a duplicate from h264data.h, and will be removed once the tables from, h264 have been split
-static const uint8_t scan8[16 + 2*4]={
- 4+1*8, 5+1*8, 4+2*8, 5+2*8,
- 6+1*8, 7+1*8, 6+2*8, 7+2*8,
- 4+3*8, 5+3*8, 4+4*8, 5+4*8,
- 6+3*8, 7+3*8, 6+4*8, 7+4*8,
- 1+1*8, 2+1*8,
- 1+2*8, 2+2*8,
- 1+4*8, 2+4*8,
- 1+5*8, 2+5*8,
-};
-
-void ff_h264_idct_add16_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
- int i;
- for(i=0; i<16; i++){
- int nnz = nnzc[ scan8[i] ];
- if(nnz){
- if(nnz==1 && block[i*16]) ff_h264_idct_dc_add_c(dst + block_offset[i], block + i*16, stride);
- else idct_internal (dst + block_offset[i], block + i*16, stride, 4, 6, 1);
- }
- }
-}
-
-void ff_h264_idct_add16intra_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
- int i;
- for(i=0; i<16; i++){
- if(nnzc[ scan8[i] ]) idct_internal (dst + block_offset[i], block + i*16, stride, 4, 6, 1);
- else if(block[i*16]) ff_h264_idct_dc_add_c(dst + block_offset[i], block + i*16, stride);
- }
-}
-
-void ff_h264_idct8_add4_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
- int i;
- for(i=0; i<16; i+=4){
- int nnz = nnzc[ scan8[i] ];
- if(nnz){
- if(nnz==1 && block[i*16]) ff_h264_idct8_dc_add_c(dst + block_offset[i], block + i*16, stride);
- else ff_h264_idct8_add_c (dst + block_offset[i], block + i*16, stride);
- }
- }
-}
-
-void ff_h264_idct_add8_c(uint8_t **dest, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
- int i;
- for(i=16; i<16+8; i++){
- if(nnzc[ scan8[i] ])
- ff_h264_idct_add_c (dest[(i&4)>>2] + block_offset[i], block + i*16, stride);
- else if(block[i*16])
- ff_h264_idct_dc_add_c(dest[(i&4)>>2] + block_offset[i], block + i*16, stride);
- }
-}
-/**
- * IDCT transforms the 16 dc values and dequantizes them.
- * @param qp quantization parameter
- */
-void ff_h264_luma_dc_dequant_idct_c(DCTELEM *output, DCTELEM *input, int qmul){
-#define stride 16
- int i;
- int temp[16];
- static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride};
-
- for(i=0; i<4; i++){
- const int z0= input[4*i+0] + input[4*i+1];
- const int z1= input[4*i+0] - input[4*i+1];
- const int z2= input[4*i+2] - input[4*i+3];
- const int z3= input[4*i+2] + input[4*i+3];
-
- temp[4*i+0]= z0+z3;
- temp[4*i+1]= z0-z3;
- temp[4*i+2]= z1-z2;
- temp[4*i+3]= z1+z2;
- }
-
- for(i=0; i<4; i++){
- const int offset= x_offset[i];
- const int z0= temp[4*0+i] + temp[4*2+i];
- const int z1= temp[4*0+i] - temp[4*2+i];
- const int z2= temp[4*1+i] - temp[4*3+i];
- const int z3= temp[4*1+i] + temp[4*3+i];
-
- output[stride* 0+offset]= ((((z0 + z3)*qmul + 128 ) >> 8));
- output[stride* 1+offset]= ((((z1 + z2)*qmul + 128 ) >> 8));
- output[stride* 4+offset]= ((((z1 - z2)*qmul + 128 ) >> 8));
- output[stride* 5+offset]= ((((z0 - z3)*qmul + 128 ) >> 8));
- }
-#undef stride
-}
-
-void ff_h264_chroma_dc_dequant_idct_c(DCTELEM *block, int qmul){
- const int stride= 16*2;
- const int xStride= 16;
- int a,b,c,d,e;
-
- a= block[stride*0 + xStride*0];
- b= block[stride*0 + xStride*1];
- c= block[stride*1 + xStride*0];
- d= block[stride*1 + xStride*1];
-
- e= a-b;
- a= a+b;
- b= c-d;
- c= c+d;
-
- block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7;
- block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7;
- block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7;
- block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7;
-}
+#include "h264idct_internal.h"
diff --git a/libavcodec/h264idct_internal.h b/libavcodec/h264idct_internal.h
new file mode 100644
index 0000000..3250c7d
--- /dev/null
+++ b/libavcodec/h264idct_internal.h
@@ -0,0 +1,278 @@
+/*
+ * H.264 IDCT
+ * Copyright (c) 2004-2011 Michael Niedermayer <michaelni at gmx.at>
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * H.264 IDCT.
+ * @author Michael Niedermayer <michaelni at gmx.at>
+ */
+
+#include "dsputil.h"
+
+#ifndef AVCODEC_H264IDCT_INTERNAL_H
+#define AVCODEC_H264IDCT_INTERNAL_H
+//FIXME this table is a duplicate from h264data.h, and will be removed once the tables from, h264 have been split
+static const uint8_t scan8[16 + 2*4]={
+ 4+1*8, 5+1*8, 4+2*8, 5+2*8,
+ 6+1*8, 7+1*8, 6+2*8, 7+2*8,
+ 4+3*8, 5+3*8, 4+4*8, 5+4*8,
+ 6+3*8, 7+3*8, 6+4*8, 7+4*8,
+ 1+1*8, 2+1*8,
+ 1+2*8, 2+2*8,
+ 1+4*8, 2+4*8,
+ 1+5*8, 2+5*8,
+};
+#endif
+
+static av_always_inline void idct_internal(uint8_t *dst, DCTELEM *block, int stride, int block_stride, int shift, int add){
+ int i;
+ uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
+
+ block[0] += 1<<(shift-1);
+
+ for(i=0; i<4; i++){
+ const int z0= block[i + block_stride*0] + block[i + block_stride*2];
+ const int z1= block[i + block_stride*0] - block[i + block_stride*2];
+ const int z2= (block[i + block_stride*1]>>1) - block[i + block_stride*3];
+ const int z3= block[i + block_stride*1] + (block[i + block_stride*3]>>1);
+
+ block[i + block_stride*0]= z0 + z3;
+ block[i + block_stride*1]= z1 + z2;
+ block[i + block_stride*2]= z1 - z2;
+ block[i + block_stride*3]= z0 - z3;
+ }
+
+ for(i=0; i<4; i++){
+ const int z0= block[0 + block_stride*i] + block[2 + block_stride*i];
+ const int z1= block[0 + block_stride*i] - block[2 + block_stride*i];
+ const int z2= (block[1 + block_stride*i]>>1) - block[3 + block_stride*i];
+ const int z3= block[1 + block_stride*i] + (block[3 + block_stride*i]>>1);
+
+ dst[i + 0*stride]= cm[ add*dst[i + 0*stride] + ((z0 + z3) >> shift) ];
+ dst[i + 1*stride]= cm[ add*dst[i + 1*stride] + ((z1 + z2) >> shift) ];
+ dst[i + 2*stride]= cm[ add*dst[i + 2*stride] + ((z1 - z2) >> shift) ];
+ dst[i + 3*stride]= cm[ add*dst[i + 3*stride] + ((z0 - z3) >> shift) ];
+ }
+}
+
+void ff_h264_idct_add_c(uint8_t *dst, DCTELEM *block, int stride){
+ idct_internal(dst, block, stride, 4, 6, 1);
+}
+
+void ff_h264_lowres_idct_add_c(uint8_t *dst, int stride, DCTELEM *block){
+ idct_internal(dst, block, stride, 8, 3, 1);
+}
+
+void ff_h264_lowres_idct_put_c(uint8_t *dst, int stride, DCTELEM *block){
+ idct_internal(dst, block, stride, 8, 3, 0);
+}
+
+void ff_h264_idct8_add_c(uint8_t *dst, DCTELEM *block, int stride){
+ int i;
+ uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
+
+ block[0] += 32;
+
+ for( i = 0; i < 8; i++ )
+ {
+ const int a0 = block[i+0*8] + block[i+4*8];
+ const int a2 = block[i+0*8] - block[i+4*8];
+ const int a4 = (block[i+2*8]>>1) - block[i+6*8];
+ const int a6 = (block[i+6*8]>>1) + block[i+2*8];
+
+ const int b0 = a0 + a6;
+ const int b2 = a2 + a4;
+ const int b4 = a2 - a4;
+ const int b6 = a0 - a6;
+
+ const int a1 = -block[i+3*8] + block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1);
+ const int a3 = block[i+1*8] + block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1);
+ const int a5 = -block[i+1*8] + block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1);
+ const int a7 = block[i+3*8] + block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1);
+
+ const int b1 = (a7>>2) + a1;
+ const int b3 = a3 + (a5>>2);
+ const int b5 = (a3>>2) - a5;
+ const int b7 = a7 - (a1>>2);
+
+ block[i+0*8] = b0 + b7;
+ block[i+7*8] = b0 - b7;
+ block[i+1*8] = b2 + b5;
+ block[i+6*8] = b2 - b5;
+ block[i+2*8] = b4 + b3;
+ block[i+5*8] = b4 - b3;
+ block[i+3*8] = b6 + b1;
+ block[i+4*8] = b6 - b1;
+ }
+ for( i = 0; i < 8; i++ )
+ {
+ const int a0 = block[0+i*8] + block[4+i*8];
+ const int a2 = block[0+i*8] - block[4+i*8];
+ const int a4 = (block[2+i*8]>>1) - block[6+i*8];
+ const int a6 = (block[6+i*8]>>1) + block[2+i*8];
+
+ const int b0 = a0 + a6;
+ const int b2 = a2 + a4;
+ const int b4 = a2 - a4;
+ const int b6 = a0 - a6;
+
+ const int a1 = -block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1);
+ const int a3 = block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1);
+ const int a5 = -block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1);
+ const int a7 = block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1);
+
+ const int b1 = (a7>>2) + a1;
+ const int b3 = a3 + (a5>>2);
+ const int b5 = (a3>>2) - a5;
+ const int b7 = a7 - (a1>>2);
+
+ dst[i + 0*stride] = cm[ dst[i + 0*stride] + ((b0 + b7) >> 6) ];
+ dst[i + 1*stride] = cm[ dst[i + 1*stride] + ((b2 + b5) >> 6) ];
+ dst[i + 2*stride] = cm[ dst[i + 2*stride] + ((b4 + b3) >> 6) ];
+ dst[i + 3*stride] = cm[ dst[i + 3*stride] + ((b6 + b1) >> 6) ];
+ dst[i + 4*stride] = cm[ dst[i + 4*stride] + ((b6 - b1) >> 6) ];
+ dst[i + 5*stride] = cm[ dst[i + 5*stride] + ((b4 - b3) >> 6) ];
+ dst[i + 6*stride] = cm[ dst[i + 6*stride] + ((b2 - b5) >> 6) ];
+ dst[i + 7*stride] = cm[ dst[i + 7*stride] + ((b0 - b7) >> 6) ];
+ }
+}
+
+// assumes all AC coefs are 0
+void ff_h264_idct_dc_add_c(uint8_t *dst, DCTELEM *block, int stride){
+ int i, j;
+ int dc = (block[0] + 32) >> 6;
+ uint8_t *cm = ff_cropTbl + MAX_NEG_CROP + dc;
+ for( j = 0; j < 4; j++ )
+ {
+ for( i = 0; i < 4; i++ )
+ dst[i] = cm[ dst[i] ];
+ dst += stride;
+ }
+}
+
+void ff_h264_idct8_dc_add_c(uint8_t *dst, DCTELEM *block, int stride){
+ int i, j;
+ int dc = (block[0] + 32) >> 6;
+ uint8_t *cm = ff_cropTbl + MAX_NEG_CROP + dc;
+ for( j = 0; j < 8; j++ )
+ {
+ for( i = 0; i < 8; i++ )
+ dst[i] = cm[ dst[i] ];
+ dst += stride;
+ }
+}
+
+void ff_h264_idct_add16_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
+ int i;
+ for(i=0; i<16; i++){
+ int nnz = nnzc[ scan8[i] ];
+ if(nnz){
+ if(nnz==1 && block[i*16]) ff_h264_idct_dc_add_c(dst + block_offset[i], block + i*16, stride);
+ else idct_internal (dst + block_offset[i], block + i*16, stride, 4, 6, 1);
+ }
+ }
+}
+
+void ff_h264_idct_add16intra_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
+ int i;
+ for(i=0; i<16; i++){
+ if(nnzc[ scan8[i] ]) idct_internal (dst + block_offset[i], block + i*16, stride, 4, 6, 1);
+ else if(block[i*16]) ff_h264_idct_dc_add_c(dst + block_offset[i], block + i*16, stride);
+ }
+}
+
+void ff_h264_idct8_add4_c(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
+ int i;
+ for(i=0; i<16; i+=4){
+ int nnz = nnzc[ scan8[i] ];
+ if(nnz){
+ if(nnz==1 && block[i*16]) ff_h264_idct8_dc_add_c(dst + block_offset[i], block + i*16, stride);
+ else ff_h264_idct8_add_c (dst + block_offset[i], block + i*16, stride);
+ }
+ }
+}
+
+void ff_h264_idct_add8_c(uint8_t **dest, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]){
+ int i;
+ for(i=16; i<16+8; i++){
+ if(nnzc[ scan8[i] ])
+ ff_h264_idct_add_c (dest[(i&4)>>2] + block_offset[i], block + i*16, stride);
+ else if(block[i*16])
+ ff_h264_idct_dc_add_c(dest[(i&4)>>2] + block_offset[i], block + i*16, stride);
+ }
+}
+/**
+ * IDCT transforms the 16 dc values and dequantizes them.
+ * @param qp quantization parameter
+ */
+void ff_h264_luma_dc_dequant_idct_c(DCTELEM *output, DCTELEM *input, int qmul){
+#define stride 16
+ int i;
+ int temp[16];
+ static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride};
+
+ for(i=0; i<4; i++){
+ const int z0= input[4*i+0] + input[4*i+1];
+ const int z1= input[4*i+0] - input[4*i+1];
+ const int z2= input[4*i+2] - input[4*i+3];
+ const int z3= input[4*i+2] + input[4*i+3];
+
+ temp[4*i+0]= z0+z3;
+ temp[4*i+1]= z0-z3;
+ temp[4*i+2]= z1-z2;
+ temp[4*i+3]= z1+z2;
+ }
+
+ for(i=0; i<4; i++){
+ const int offset= x_offset[i];
+ const int z0= temp[4*0+i] + temp[4*2+i];
+ const int z1= temp[4*0+i] - temp[4*2+i];
+ const int z2= temp[4*1+i] - temp[4*3+i];
+ const int z3= temp[4*1+i] + temp[4*3+i];
+
+ output[stride* 0+offset]= ((((z0 + z3)*qmul + 128 ) >> 8));
+ output[stride* 1+offset]= ((((z1 + z2)*qmul + 128 ) >> 8));
+ output[stride* 4+offset]= ((((z1 - z2)*qmul + 128 ) >> 8));
+ output[stride* 5+offset]= ((((z0 - z3)*qmul + 128 ) >> 8));
+ }
+#undef stride
+}
+
+void ff_h264_chroma_dc_dequant_idct_c(DCTELEM *block, int qmul){
+ const int stride= 16*2;
+ const int xStride= 16;
+ int a,b,c,d,e;
+
+ a= block[stride*0 + xStride*0];
+ b= block[stride*0 + xStride*1];
+ c= block[stride*1 + xStride*0];
+ d= block[stride*1 + xStride*1];
+
+ e= a-b;
+ a= a+b;
+ b= c-d;
+ c= c+d;
+
+ block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7;
+ block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7;
+ block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7;
+ block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7;
+}
--
1.7.3.5
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