VOC / Mbed 2 deprecated Dumb_box_rev2

test

Dependencies:   Nanopb iSerial mbed BaseJpegDecode FatFileSystem SDFileSystem RingBuffer Camera_LS_Y201

extlib/BaseJpegDecode/inverseDCT.cpp@0:d69efd0ee139, 2014-09-18 (annotated)

Committer:
cgraham
Date:
Thu Sep 18 15:21:47 2014 +0000
Revision:
0:d69efd0ee139
test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
cgraham 0:d69efd0ee139 1 #include "mbed.h"
cgraham 0:d69efd0ee139 2 #include "inverseDCT.h"
cgraham 0:d69efd0ee139 3
cgraham 0:d69efd0ee139 4 #ifdef USE_IDCT_AAN
cgraham 0:d69efd0ee139 5 const int zigzag[64] =
cgraham 0:d69efd0ee139 6 {0,
cgraham 0:d69efd0ee139 7 1, 8,
cgraham 0:d69efd0ee139 8 16, 9, 2,
cgraham 0:d69efd0ee139 9 3,10,17,24,
cgraham 0:d69efd0ee139 10 32,25,18,11, 4,
cgraham 0:d69efd0ee139 11 5,12,19,26,33,40,
cgraham 0:d69efd0ee139 12 48,41,34,27,20,13,6,
cgraham 0:d69efd0ee139 13 7,14,21,28,35,42,49,56,
cgraham 0:d69efd0ee139 14 57,50,43,36,29,22,15,
cgraham 0:d69efd0ee139 15 23,30,37,44,51,58,
cgraham 0:d69efd0ee139 16 59,52,45,38,31,
cgraham 0:d69efd0ee139 17 39,46,53,60,
cgraham 0:d69efd0ee139 18 61,54,47,
cgraham 0:d69efd0ee139 19 55,62,
cgraham 0:d69efd0ee139 20 63};
cgraham 0:d69efd0ee139 21
cgraham 0:d69efd0ee139 22 void inverseDCT::inputBLOCK(int mcu, int block, int scan, int value) {
cgraham 0:d69efd0ee139 23 if (scan == 0) {
cgraham 0:d69efd0ee139 24 for(int i = 0; i < 64; i++) {
cgraham 0:d69efd0ee139 25 m_s[i] = 0;
cgraham 0:d69efd0ee139 26 }
cgraham 0:d69efd0ee139 27 }
cgraham 0:d69efd0ee139 28 m_s[zigzag[scan]] = value;
cgraham 0:d69efd0ee139 29 if (scan == 63) { // last
cgraham 0:d69efd0ee139 30 idct.conv(reinterpret_cast<int8_t*>(m_s), m_s);
cgraham 0:d69efd0ee139 31 outputBLOCK(mcu, block, reinterpret_cast<int8_t*>(m_s));
cgraham 0:d69efd0ee139 32 }
cgraham 0:d69efd0ee139 33 };
cgraham 0:d69efd0ee139 34 #endif //USE_IDCT_AAN
cgraham 0:d69efd0ee139 35
cgraham 0:d69efd0ee139 36 #ifdef USE_IDCT_TABLE
cgraham 0:d69efd0ee139 37 #include "inverseDCT_table.h"
cgraham 0:d69efd0ee139 38 void inverseDCT::inputBLOCK(int mcu, int block, int scan, int value)
cgraham 0:d69efd0ee139 39 {
cgraham 0:d69efd0ee139 40 if (scan == 0) {
cgraham 0:d69efd0ee139 41 int t = value * 32 / 8;
cgraham 0:d69efd0ee139 42 for(int i = 0; i < 64; i++) {
cgraham 0:d69efd0ee139 43 m_sum[i] = t;
cgraham 0:d69efd0ee139 44 }
cgraham 0:d69efd0ee139 45 return;
cgraham 0:d69efd0ee139 46 }
cgraham 0:d69efd0ee139 47
cgraham 0:d69efd0ee139 48 if (value != 0) {
cgraham 0:d69efd0ee139 49 for(int xy = 0; xy < 64; xy++) {
cgraham 0:d69efd0ee139 50 m_sum[xy] += idct_table[scan*64+xy] * value / 16;
cgraham 0:d69efd0ee139 51 }
cgraham 0:d69efd0ee139 52 }
cgraham 0:d69efd0ee139 53
cgraham 0:d69efd0ee139 54 if (scan == 63) {
cgraham 0:d69efd0ee139 55 int8_t* result = reinterpret_cast<int8_t*>(m_sum);
cgraham 0:d69efd0ee139 56 for(int i = 0; i < 64; i++) {
cgraham 0:d69efd0ee139 57 int t = m_sum[i] / 32;
cgraham 0:d69efd0ee139 58 if (t > 127) {
cgraham 0:d69efd0ee139 59 t = 127;
cgraham 0:d69efd0ee139 60 } else if (t < -128) {
cgraham 0:d69efd0ee139 61 t = -128;
cgraham 0:d69efd0ee139 62 }
cgraham 0:d69efd0ee139 63 result[i] = t;
cgraham 0:d69efd0ee139 64 }
cgraham 0:d69efd0ee139 65 outputBLOCK(mcu, block, result);
cgraham 0:d69efd0ee139 66 }
cgraham 0:d69efd0ee139 67 }
cgraham 0:d69efd0ee139 68 #endif //USE_IDCT_TABLE