1 files changed, 140 insertions, 0 deletions
diff --git a/mpg123_artsplugin/mpg123/dct64_i486-b.c b/mpg123_artsplugin/mpg123/dct64_i486-b.c
new file mode 100644
index 00000000..cb57f57f
--- /dev/null
+++ b/mpg123_artsplugin/mpg123/dct64_i486-b.c
@@ -0,0 +1,140 @@
+/* Discrete Cosine Tansform (DCT) for subband synthesis.
+ *
+ * This code is optimized for 80486. It should be compiled with gcc
+ * 2.7.2 or higher.
+ *
+ * Note: This code does not give the necessary accuracy. Moreover, no
+ * overflow test are done.
+ *
+ * (c) 1998 Fabrice Bellard.  
+ * 
+ * Rewrite to asm with algorithm and memory optimization 
+ *
+ * (c)  2000 Petr Salinger
+ *
+ * GPL clean
+ *
+ */
+
+#include "mpg123.h"
+
+#define COS_0_0 16403
+#define COS_0_1 16563
+#define COS_0_2 16890
+#define COS_0_3 17401
+#define COS_0_4 18124
+#define COS_0_5 19101
+#define COS_0_6 20398
+#define COS_0_7 22112
+#define COS_0_8 24396
+#define COS_0_9 27503
+#define COS_0_10 31869
+#define COS_0_11 38320
+#define COS_0_12 48633
+#define COS_0_13 67429
+#define COS_0_14 111660
+#define COS_0_15 333906
+#define COS_1_0 16463
+#define COS_1_1 17121
+#define COS_1_2 18577
+#define COS_1_3 21195
+#define COS_1_4 25826
+#define COS_1_5 34756
+#define COS_1_6 56441
+#define COS_1_7 167154
+#define COS_2_0 16704
+#define COS_2_1 19704
+#define COS_2_2 29490
+#define COS_2_3 83981
+#define COS_3_0 17733
+#define COS_3_1 42813
+#define COS_4_0 23170         
+
+#define SETOUT(out,n,expr) out[FIR_BUFFER_SIZE*(n)]=(expr)
+#define MUL(a,b) (((a)*(b)) >> 15)
+#define MULL(a,b) (((long long)(a)*(long long)(b)) >> 15)
+#define TOINT(a) ((int)((a)*32768.0))
+
+void dct64_1_486_a(real *samples, int *bx);
+
+void dct64_1_486_b(int *out0, int *out1, int *b1)
+{
+  b1[0x02] += b1[0x03];
+  b1[0x06] += b1[0x07];
+  b1[0x04] += b1[0x06];
+  b1[0x06] += b1[0x05];
+  b1[0x05] += b1[0x07];
+
+  b1[0x0A] += b1[0x0B];
+  b1[0x0E] += b1[0x0F];
+  b1[0x0C] += b1[0x0E];
+  b1[0x0E] += b1[0x0D];
+  b1[0x0D] += b1[0x0F];
+
+  b1[0x12] += b1[0x13];
+  b1[0x16] += b1[0x17];
+  b1[0x14] += b1[0x16];
+  b1[0x16] += b1[0x15];
+  b1[0x15] += b1[0x17];
+
+  b1[0x1A] += b1[0x1B];
+  b1[0x1E] += b1[0x1F];
+  b1[0x1C] += b1[0x1E];
+  b1[0x1E] += b1[0x1D];
+  b1[0x1D] += b1[0x1F];
+
+ SETOUT(out0,16,b1[0x00]);
+ SETOUT(out0,12,b1[0x04]);
+ SETOUT(out0, 8,b1[0x02]);
+ SETOUT(out0, 4,b1[0x06]);
+ SETOUT(out0, 0,b1[0x01]);
+ SETOUT(out1, 0,b1[0x01]);
+ SETOUT(out1, 4,b1[0x05]);
+ SETOUT(out1, 8,b1[0x03]);
+ SETOUT(out1,12,b1[0x07]);
+
+ SETOUT(out0,14, b1[0x08] + b1[0x0C]);
+ SETOUT(out0,10, b1[0x0C] + b1[0x0A]);
+ SETOUT(out0, 6, b1[0x0A] + b1[0x0E]);
+ SETOUT(out0, 2, b1[0x0E] + b1[0x09]);
+ SETOUT(out1, 2, b1[0x09] + b1[0x0D]);
+ SETOUT(out1, 6, b1[0x0D] + b1[0x0B]);
+ SETOUT(out1,10, b1[0x0B] + b1[0x0F]);
+ SETOUT(out1,14, b1[0x0F]);
+
+ b1[0x18] += b1[0x1C];
+ SETOUT(out0,15,b1[0x10] + b1[0x18]);
+ SETOUT(out0,13,b1[0x18] + b1[0x14]);
+ b1[0x1C] += b1[0x1a];
+ SETOUT(out0,11,b1[0x14] + b1[0x1C]);
+ SETOUT(out0, 9,b1[0x1C] + b1[0x12]);
+ b1[0x1A] += b1[0x1E];
+ SETOUT(out0, 7,b1[0x12] + b1[0x1A]);
+ SETOUT(out0, 5,b1[0x1A] + b1[0x16]);
+ b1[0x1E] += b1[0x19];
+ SETOUT(out0, 3,b1[0x16] + b1[0x1E]);
+ SETOUT(out0, 1,b1[0x1E] + b1[0x11]);
+ b1[0x19] += b1[0x1D];
+ SETOUT(out1, 1,b1[0x11] + b1[0x19]);
+ SETOUT(out1, 3,b1[0x19] + b1[0x15]);
+ b1[0x1D] += b1[0x1B];
+ SETOUT(out1, 5,b1[0x15] + b1[0x1D]);
+ SETOUT(out1, 7,b1[0x1D] + b1[0x13]);
+ b1[0x1B] += b1[0x1F];
+ SETOUT(out1, 9,b1[0x13] + b1[0x1B]);
+ SETOUT(out1,11,b1[0x1B] + b1[0x17]);
+ SETOUT(out1,13,b1[0x17] + b1[0x1F]);
+ SETOUT(out1,15,b1[0x1F]);
+}
+
+/*
+ * main DCT function
+ */
+void dct64_486(int *a,int *b,real *samples)
+{
+  int bufs[33]; /* 32 + 1 extra for 8B store from x87 */
+
+  dct64_1_486_a(samples,bufs);
+  dct64_1_486_b(a,b,bufs);
+}
+