From a31630e0d5b9880c716d9004ef4154396ba41ebc Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Thu, 2 Jan 2014 21:55:13 +0100
Subject: Extract fec-3.0.1

---
 viterbi27.c | 161 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 viterbi27.c

(limited to 'viterbi27.c')

diff --git a/viterbi27.c b/viterbi27.c
new file mode 100644
index 0000000..554da92
--- /dev/null
+++ b/viterbi27.c
@@ -0,0 +1,161 @@
+/* K=7 r=1/2 Viterbi decoder with optional Intel or PowerPC SIMD
+ * Copyright Feb 2004, Phil Karn, KA9Q
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <memory.h>
+#include "fec.h"
+
+/* Create a new instance of a Viterbi decoder */
+void *create_viterbi27(int len){
+  find_cpu_mode();
+
+  switch(Cpu_mode){
+  case PORT:
+  default:
+    return create_viterbi27_port(len);
+#ifdef __VEC__
+  case ALTIVEC:
+    return create_viterbi27_av(len);
+#endif
+#ifdef __i386__
+  case MMX:
+    return create_viterbi27_mmx(len);
+  case SSE:
+    return create_viterbi27_sse(len);
+  case SSE2:
+    return create_viterbi27_sse2(len);
+#endif
+  }
+}
+
+void set_viterbi27_polynomial(int polys[2]){
+  switch(Cpu_mode){
+  case PORT:
+  default:
+    set_viterbi27_polynomial_port(polys);
+    break;
+#ifdef __VEC__
+  case ALTIVEC:
+    set_viterbi27_polynomial_av(polys);
+    break;
+#endif
+#ifdef __i386__
+  case MMX:
+    set_viterbi27_polynomial_mmx(polys);
+    break;
+  case SSE:
+    set_viterbi27_polynomial_sse(polys);
+    break;
+  case SSE2:
+    set_viterbi27_polynomial_sse2(polys);
+    break;
+#endif
+  }
+}
+
+/* Initialize Viterbi decoder for start of new frame */
+int init_viterbi27(void *p,int starting_state){
+    switch(Cpu_mode){
+    case PORT:
+    default:
+      return init_viterbi27_port(p,starting_state);
+#ifdef __VEC__
+    case ALTIVEC:
+      return init_viterbi27_av(p,starting_state);
+#endif
+#ifdef __i386__
+    case MMX:
+      return init_viterbi27_mmx(p,starting_state);
+    case SSE:
+      return init_viterbi27_sse(p,starting_state);
+    case SSE2:
+      return init_viterbi27_sse2(p,starting_state);
+#endif
+    }
+}
+
+/* Viterbi chainback */
+int chainback_viterbi27(
+      void *p,
+      unsigned char *data, /* Decoded output data */
+      unsigned int nbits, /* Number of data bits */
+      unsigned int endstate){ /* Terminal encoder state */
+
+    switch(Cpu_mode){
+    case PORT:
+    default:
+      return chainback_viterbi27_port(p,data,nbits,endstate);
+#ifdef __VEC__
+    case ALTIVEC:
+      return chainback_viterbi27_av(p,data,nbits,endstate);
+#endif
+#ifdef __i386__
+    case MMX:
+      return chainback_viterbi27_mmx(p,data,nbits,endstate);
+    case SSE:
+      return chainback_viterbi27_sse(p,data,nbits,endstate);
+    case SSE2:
+      return chainback_viterbi27_sse2(p,data,nbits,endstate);
+#endif
+    }
+}
+
+/* Delete instance of a Viterbi decoder */
+void delete_viterbi27(void *p){
+    switch(Cpu_mode){
+    case PORT:
+    default:
+      delete_viterbi27_port(p);
+      break;
+#ifdef __VEC__
+    case ALTIVEC:
+      delete_viterbi27_av(p);
+      break;
+#endif
+#ifdef __i386__
+    case MMX:
+      delete_viterbi27_mmx(p);
+      break;
+    case SSE:
+      delete_viterbi27_sse(p);
+      break;
+    case SSE2:
+      delete_viterbi27_sse2(p);
+      break;
+#endif
+    }
+}
+
+/* Update decoder with a block of demodulated symbols
+ * Note that nbits is the number of decoded data bits, not the number
+ * of symbols!
+ */
+int update_viterbi27_blk(void *p,unsigned char syms[],int nbits){
+  if(p == NULL)
+    return -1;
+
+  switch(Cpu_mode){
+  case PORT:
+  default:
+    update_viterbi27_blk_port(p,syms,nbits);
+    break;
+#ifdef __VEC__
+  case ALTIVEC:
+    update_viterbi27_blk_av(p,syms,nbits);
+    break;
+#endif
+#ifdef __i386__
+  case MMX:
+    update_viterbi27_blk_mmx(p,syms,nbits);
+    break;
+  case SSE:
+    update_viterbi27_blk_sse(p,syms,nbits);
+    break;
+  case SSE2:
+    update_viterbi27_blk_sse2(p,syms,nbits);
+    break;
+#endif
+  }
+  return 0;
+}
-- 
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