From dcf6b20403886932bff88ba93fa47c954abc38a6 Mon Sep 17 00:00:00 2001
From: uid56437 <none@none>
Date: Wed, 4 Jul 2001 14:09:52 +0000
Subject: * 32-bit aligned memory access for bitstream access, so a SPARC cpu
 is happy. * gcc-3.0 fixes for bit_allocate.c: The same variable is used with
 autoincrement   on left/right side of an assigment,  which is an undefined
 operation.

CVS patchset: 246
CVS date: 2001/07/04 14:09:52
---
 src/libac3/bit_allocate.c | 15 ++++++++++-----
 src/libac3/bitstream.c    | 26 +++++++++++++-------------
 src/libac3/bitstream.h    |  5 -----
 3 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/src/libac3/bit_allocate.c b/src/libac3/bit_allocate.c
index 74c5ec902..17f35b159 100644
--- a/src/libac3/bit_allocate.c
+++ b/src/libac3/bit_allocate.c
@@ -165,7 +165,8 @@ void bit_allocate(int fscod, audblk_t * audblk, ac3_ba_t * ba,
 	    psd = 128 * exp[i];
 	    mask = psd + fgain + lowcomp;
 	    COMPUTE_MASK ();
-	    bap[i++] = (baptab+156)[mask + 4 * exp[i]];
+	    bap[i] = (baptab+156)[mask + 4 * exp[i]];
+	    i++;
 	} while ((i < 3) || ((i < 7) && (exp[i] > exp[i-1])));
 	fastleak = psd + fgain;
 	slowleak = psd + sgain;
@@ -182,7 +183,8 @@ void bit_allocate(int fscod, audblk_t * audblk, ac3_ba_t * ba,
 	    mask = ((fastleak + lowcomp < slowleak) ?
 		    fastleak + lowcomp : slowleak);
 	    COMPUTE_MASK ();
-	    bap[i++] = (baptab+156)[mask + 4 * exp[i]];
+	    bap[i] = (baptab+156)[mask + 4 * exp[i]];
+	    i++;
 	}
 
 	if (end == 7)	// lfe channel
@@ -198,7 +200,8 @@ void bit_allocate(int fscod, audblk_t * audblk, ac3_ba_t * ba,
 	    mask = ((fastleak + lowcomp < slowleak) ?
 		    fastleak + lowcomp : slowleak);
 	    COMPUTE_MASK ();
-	    bap[i++] = (baptab+156)[mask + 4 * exp[i]];
+	    bap[i] = (baptab+156)[mask + 4 * exp[i]];
+	    i++;
 	} while (i < 20);
 
 	while (lowcomp > 128) {		// two iterations maximum
@@ -208,7 +211,8 @@ void bit_allocate(int fscod, audblk_t * audblk, ac3_ba_t * ba,
 	    mask = ((fastleak + lowcomp < slowleak) ?
 		    fastleak + lowcomp : slowleak);
 	    COMPUTE_MASK ();
-	    bap[i++] = (baptab+156)[mask + 4 * exp[i]];
+	    bap[i] = (baptab+156)[mask + 4 * exp[i]];
+	    i++;
 	}
 	j = i;
     }
@@ -245,7 +249,8 @@ void bit_allocate(int fscod, audblk_t * audblk, ac3_ba_t * ba,
 	do {
 	    // max(mask+4*exp)=147=-(minpsd+fgain-deltba-snroffset)>>5+4*exp
 	    // min(mask+4*exp)=-156=-(sgain-deltba-snroffset)>>5
-	    bap[j++] = (baptab+156)[mask + 4 * exp[j]];
+	    bap[j] = (baptab+156)[mask + 4 * exp[j]];
+	    j++;
 	} while (j < endband);
     } while (j < end);
 }
diff --git a/src/libac3/bitstream.c b/src/libac3/bitstream.c
index 1f4aff54e..2a06ea747 100644
--- a/src/libac3/bitstream.c
+++ b/src/libac3/bitstream.c
@@ -22,6 +22,7 @@
  */
 
 #include <stdlib.h>
+#include <stddef.h>
 #include <stdio.h>
 
 #include "ac3.h"
@@ -30,32 +31,31 @@
 
 #define BUFFER_SIZE 4096
 
-static uint8_t *buffer_start;
+struct uint32_alignment {
+    char    	a;
+    uint32_t	b;
+};
+#define	UINT32_ALIGNMENT	offsetof(struct uint32_alignment, b)
+
+
+static uint32_t *buffer_start;
 
 uint32_t bits_left;
 uint32_t current_word;
 
 void bitstream_set_ptr (uint8_t * buf)
 {
-    buffer_start = buf;
+    int align = (long)buf & (UINT32_ALIGNMENT-1);
+    buffer_start = (uint32_t *) (buf - align);
     bits_left = 0;
+    if (align > 0) bitstream_get(align * 8);
 }
 
 static inline void
 bitstream_fill_current()
 {
-#ifdef __sparc__
-#warning FIXME: cannot access unaligned pointer on sparc
-    current_word = 
-	(buffer_start[0] << 24) |
-	(buffer_start[1] << 16) |
-	(buffer_start[2] <<  8) |
-	 buffer_start[3];
-    buffer_start += 4;
-#else
-    current_word = *((uint32_t*)buffer_start)++;
+    current_word = *buffer_start++;
     current_word = swab32(current_word);
-#endif
 }
 
 //
diff --git a/src/libac3/bitstream.h b/src/libac3/bitstream.h
index b5d896184..84f3287c8 100644
--- a/src/libac3/bitstream.h
+++ b/src/libac3/bitstream.h
@@ -21,11 +21,6 @@
  *
  */
 
-#warning FIXME: need WORDS_BIGENDIAN autoconf test
-#ifdef __sparc__
-#define	WORDS_BIGENDIAN 1
-#endif
-
 //My new and improved vego-matic endian swapping routine
 //(stolen from the kernel)
 #ifdef WORDS_BIGENDIAN
-- 
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