summaryrefslogtreecommitdiff
path: root/src/libffmpeg/libavcodec/simple_idct.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libffmpeg/libavcodec/simple_idct.c')
-rw-r--r--src/libffmpeg/libavcodec/simple_idct.c341
1 files changed, 77 insertions, 264 deletions
diff --git a/src/libffmpeg/libavcodec/simple_idct.c b/src/libffmpeg/libavcodec/simple_idct.c
index ccebd67a9..ad27ac594 100644
--- a/src/libffmpeg/libavcodec/simple_idct.c
+++ b/src/libffmpeg/libavcodec/simple_idct.c
@@ -25,8 +25,6 @@
#include "dsputil.h"
#include "simple_idct.h"
-//#define ARCH_ALPHA
-
#if 0
#define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */
#define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */
@@ -49,10 +47,6 @@
#define COL_SHIFT 20 // 6
#endif
-#ifdef ARCH_ALPHA
-#define FAST_64BIT
-#endif
-
#if defined(ARCH_POWERPC_405)
/* signed 16x16 -> 32 multiply add accumulate */
@@ -73,180 +67,6 @@
#endif
-#ifdef ARCH_ALPHA
-/* 0: all entries 0, 1: only first entry nonzero, 2: otherwise */
-static inline int idctRowCondDC(int16_t *row)
-{
- int_fast32_t a0, a1, a2, a3, b0, b1, b2, b3;
- uint64_t *lrow = (uint64_t *) row;
-
- if (lrow[1] == 0) {
- if (lrow[0] == 0)
- return 0;
- if ((lrow[0] & ~0xffffULL) == 0) {
- uint64_t v;
-#if 1 //is ok if |a0| < 1024 than theres an +-1 error (for the *W4 case for W4=16383 !!!)
- a0 = row[0]<<3;
-#else
- a0 = W4 * row[0];
- a0 += 1 << (ROW_SHIFT - 1);
- a0 >>= ROW_SHIFT;
-#endif
- v = (uint16_t) a0;
- v += v << 16;
- v += v << 32;
- lrow[0] = v;
- lrow[1] = v;
-
- return 1;
- }
- }
-
- a0 = (W4 * row[0]) + (1 << (ROW_SHIFT - 1));
- a1 = a0;
- a2 = a0;
- a3 = a0;
-
- if (row[2]) {
- a0 += W2 * row[2];
- a1 += W6 * row[2];
- a2 -= W6 * row[2];
- a3 -= W2 * row[2];
- }
-
- if (row[4]) {
- a0 += W4 * row[4];
- a1 -= W4 * row[4];
- a2 -= W4 * row[4];
- a3 += W4 * row[4];
- }
-
- if (row[6]) {
- a0 += W6 * row[6];
- a1 -= W2 * row[6];
- a2 += W2 * row[6];
- a3 -= W6 * row[6];
- }
-
- if (row[1]) {
- b0 = W1 * row[1];
- b1 = W3 * row[1];
- b2 = W5 * row[1];
- b3 = W7 * row[1];
- } else {
- b0 = 0;
- b1 = 0;
- b2 = 0;
- b3 = 0;
- }
-
- if (row[3]) {
- b0 += W3 * row[3];
- b1 -= W7 * row[3];
- b2 -= W1 * row[3];
- b3 -= W5 * row[3];
- }
-
- if (row[5]) {
- b0 += W5 * row[5];
- b1 -= W1 * row[5];
- b2 += W7 * row[5];
- b3 += W3 * row[5];
- }
-
- if (row[7]) {
- b0 += W7 * row[7];
- b1 -= W5 * row[7];
- b2 += W3 * row[7];
- b3 -= W1 * row[7];
- }
-
- row[0] = (a0 + b0) >> ROW_SHIFT;
- row[1] = (a1 + b1) >> ROW_SHIFT;
- row[2] = (a2 + b2) >> ROW_SHIFT;
- row[3] = (a3 + b3) >> ROW_SHIFT;
- row[4] = (a3 - b3) >> ROW_SHIFT;
- row[5] = (a2 - b2) >> ROW_SHIFT;
- row[6] = (a1 - b1) >> ROW_SHIFT;
- row[7] = (a0 - b0) >> ROW_SHIFT;
-
- return 2;
-}
-
-inline static void idctSparseCol2(int16_t *col)
-{
- int a0, a1, a2, a3, b0, b1, b2, b3;
-
- col[0] += (1 << (COL_SHIFT - 1)) / W4;
-
- a0 = W4 * col[8 * 0];
- a1 = W4 * col[8 * 0];
- a2 = W4 * col[8 * 0];
- a3 = W4 * col[8 * 0];
-
- if (col[8 * 2]) {
- a0 += W2 * col[8 * 2];
- a1 += W6 * col[8 * 2];
- a2 -= W6 * col[8 * 2];
- a3 -= W2 * col[8 * 2];
- }
-
- if (col[8 * 4]) {
- a0 += W4 * col[8 * 4];
- a1 -= W4 * col[8 * 4];
- a2 -= W4 * col[8 * 4];
- a3 += W4 * col[8 * 4];
- }
-
- if (col[8 * 6]) {
- a0 += W6 * col[8 * 6];
- a1 -= W2 * col[8 * 6];
- a2 += W2 * col[8 * 6];
- a3 -= W6 * col[8 * 6];
- }
-
- if (col[8 * 1]) {
- b0 = W1 * col[8 * 1];
- b1 = W3 * col[8 * 1];
- b2 = W5 * col[8 * 1];
- b3 = W7 * col[8 * 1];
- } else {
- b0 = b1 = b2 = b3 = 0;
- }
-
- if (col[8 * 3]) {
- b0 += W3 * col[8 * 3];
- b1 -= W7 * col[8 * 3];
- b2 -= W1 * col[8 * 3];
- b3 -= W5 * col[8 * 3];
- }
-
- if (col[8 * 5]) {
- b0 += W5 * col[8 * 5];
- b1 -= W1 * col[8 * 5];
- b2 += W7 * col[8 * 5];
- b3 += W3 * col[8 * 5];
- }
-
- if (col[8 * 7]) {
- b0 += W7 * col[8 * 7];
- b1 -= W5 * col[8 * 7];
- b2 += W3 * col[8 * 7];
- b3 -= W1 * col[8 * 7];
- }
-
- col[8 * 0] = (a0 + b0) >> COL_SHIFT;
- col[8 * 7] = (a0 - b0) >> COL_SHIFT;
- col[8 * 1] = (a1 + b1) >> COL_SHIFT;
- col[8 * 6] = (a1 - b1) >> COL_SHIFT;
- col[8 * 2] = (a2 + b2) >> COL_SHIFT;
- col[8 * 5] = (a2 - b2) >> COL_SHIFT;
- col[8 * 3] = (a3 + b3) >> COL_SHIFT;
- col[8 * 4] = (a3 - b3) >> COL_SHIFT;
-}
-
-#else /* not ARCH_ALPHA */
-
static inline void idctRowCondDC (int16_t * row)
{
int a0, a1, a2, a3, b0, b1, b2, b3;
@@ -337,7 +157,6 @@ static inline void idctRowCondDC (int16_t * row)
row[3] = (a3 + b3) >> ROW_SHIFT;
row[4] = (a3 - b3) >> ROW_SHIFT;
}
-#endif /* not ARCH_ALPHA */
static inline void idctSparseColPut (UINT8 *dest, int line_size,
int16_t * col)
@@ -546,87 +365,6 @@ static inline void idctSparseCol (int16_t * col)
col[56] = ((a0 - b0) >> COL_SHIFT);
}
-
-#ifdef ARCH_ALPHA
-/* If all rows but the first one are zero after row transformation,
- all rows will be identical after column transformation. */
-static inline void idctCol2(int16_t *col)
-{
- int i;
- uint64_t l, r;
- uint64_t *lcol = (uint64_t *) col;
-
- for (i = 0; i < 8; ++i) {
- int a0 = col[0] + (1 << (COL_SHIFT - 1)) / W4;
-
- a0 *= W4;
- col[0] = a0 >> COL_SHIFT;
- ++col;
- }
-
- l = lcol[0];
- r = lcol[1];
- lcol[ 2] = l; lcol[ 3] = r;
- lcol[ 4] = l; lcol[ 5] = r;
- lcol[ 6] = l; lcol[ 7] = r;
- lcol[ 8] = l; lcol[ 9] = r;
- lcol[10] = l; lcol[11] = r;
- lcol[12] = l; lcol[13] = r;
- lcol[14] = l; lcol[15] = r;
-}
-
-void simple_idct (short *block)
-{
-
- int i;
- int rowsZero = 1; /* all rows except row 0 zero */
- int rowsConstant = 1; /* all rows consist of a constant value */
-
- for (i = 0; i < 8; i++) {
- int sparseness = idctRowCondDC(block + 8 * i);
-
- if (i > 0 && sparseness > 0)
- rowsZero = 0;
- if (sparseness == 2)
- rowsConstant = 0;
- }
-
- if (rowsZero) {
- idctCol2(block);
- } else if (rowsConstant) {
- uint64_t *lblock = (uint64_t *) block;
-
- idctSparseCol2(block);
- for (i = 0; i < 8; i++) {
- uint64_t v = (uint16_t) block[i * 8];
-
- v += v << 16;
- v += v << 32;
- lblock[0] = v;
- lblock[1] = v;
- lblock += 2;
- }
- } else {
- for (i = 0; i < 8; i++)
- idctSparseCol2(block + i);
- }
-}
-
-/* XXX: suppress this mess */
-void simple_idct_put(UINT8 *dest, int line_size, DCTELEM *block)
-{
- simple_idct(block);
- put_pixels_clamped(block, dest, line_size);
-}
-
-void simple_idct_add(UINT8 *dest, int line_size, DCTELEM *block)
-{
- simple_idct(block);
- add_pixels_clamped(block, dest, line_size);
-}
-
-#else
-
void simple_idct_put(UINT8 *dest, int line_size, INT16 *block)
{
int i;
@@ -657,6 +395,81 @@ void simple_idct(INT16 *block)
idctSparseCol(block + i);
}
-#endif
+/* 2x4x8 idct */
+
+#define CN_SHIFT 12
+#define C_FIX(x) ((int)((x) * (1 << CN_SHIFT) + 0.5))
+#define C1 C_FIX(0.6532814824)
+#define C2 C_FIX(0.2705980501)
+
+/* row idct is multiple by 16 * sqrt(2.0), col idct4 is normalized,
+ and the butterfly must be multiplied by 0.5 * sqrt(2.0) */
+#define C_SHIFT (4+1+12)
+
+static inline void idct4col(UINT8 *dest, int line_size, const INT16 *col)
+{
+ int c0, c1, c2, c3, a0, a1, a2, a3;
+ const UINT8 *cm = cropTbl + MAX_NEG_CROP;
+
+ a0 = col[8*0];
+ a1 = col[8*2];
+ a2 = col[8*4];
+ a3 = col[8*6];
+ c0 = ((a0 + a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1));
+ c2 = ((a0 - a2) << (CN_SHIFT - 1)) + (1 << (C_SHIFT - 1));
+ c1 = a1 * C1 + a3 * C2;
+ c3 = a1 * C2 - a3 * C1;
+ dest[0] = cm[(c0 + c1) >> C_SHIFT];
+ dest += line_size;
+ dest[0] = cm[(c2 + c3) >> C_SHIFT];
+ dest += line_size;
+ dest[0] = cm[(c2 - c3) >> C_SHIFT];
+ dest += line_size;
+ dest[0] = cm[(c0 - c1) >> C_SHIFT];
+}
+
+#define BF(k) \
+{\
+ int a0, a1;\
+ a0 = ptr[k];\
+ a1 = ptr[8 + k];\
+ ptr[k] = a0 + a1;\
+ ptr[8 + k] = a0 - a1;\
+}
+
+/* only used by DV codec. The input must be interlaced. 128 is added
+ to the pixels before clamping to avoid systematic error
+ (1024*sqrt(2)) offset would be needed otherwise. */
+/* XXX: I think a 1.0/sqrt(2) normalization should be needed to
+ compensate the extra butterfly stage - I don't have the full DV
+ specification */
+void simple_idct248_put(UINT8 *dest, int line_size, INT16 *block)
+{
+ int i;
+ INT16 *ptr;
+
+ /* butterfly */
+ ptr = block;
+ for(i=0;i<4;i++) {
+ BF(0);
+ BF(1);
+ BF(2);
+ BF(3);
+ BF(4);
+ BF(5);
+ BF(6);
+ BF(7);
+ ptr += 2 * 8;
+ }
+
+ /* IDCT8 on each line */
+ for(i=0; i<8; i++) {
+ idctRowCondDC(block + i*8);
+ }
-#undef COL_SHIFT
+ /* IDCT4 and store */
+ for(i=0;i<8;i++) {
+ idct4col(dest + i, 2 * line_size, block + i);
+ idct4col(dest + line_size + i, 2 * line_size, block + 8 + i);
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-01 07:48:40 +0000