ffmpeg roll of source to mar 9 version...

patched-ffmpeg-mt/libavutil/intreadwrite.h

 /*
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef AVUTIL_INTREADWRITE_H
 #define AVUTIL_INTREADWRITE_H
 
 #include <stdint.h>
 #include "config.h"
 #include "bswap.h"
+#include "common.h"
+
+typedef union {
+    uint64_t u64;
+    uint32_t u32[2];
+    uint16_t u16[4];
+    uint8_t  u8 [8];
+    double   f64;
+    float    f32[2];
+} av_alias av_alias64;
+
+typedef union {
+    uint32_t u32;
+    uint16_t u16[2];
+    uint8_t  u8 [4];
+    float    f32;
+} av_alias av_alias32;
+
+typedef union {
+    uint16_t u16;
+    uint8_t  u8 [2];
+} av_alias av_alias16;
 
 /*
  * Arch-specific headers can provide any combination of
  * AV_[RW][BLN](16|24|32|64) and AV_(COPY|SWAP|ZERO)(64|128) macros.
  * Preprocessor symbols must be defined, even if these are implemented
  * as inline functions.
  */
 
 #if   ARCH_ARM
 #   include "arm/intreadwrite.h"
 #elif ARCH_AVR32
 #   include "avr32/intreadwrite.h"
 #elif ARCH_MIPS
 #   include "mips/intreadwrite.h"
 #elif ARCH_PPC
 #   include "ppc/intreadwrite.h"
+#elif ARCH_TOMI
+#   include "tomi/intreadwrite.h"
 #elif ARCH_X86
 #   include "x86/intreadwrite.h"
 #endif
 
 /*
  * Map AV_RNXX <-> AV_R[BL]XX for all variants provided by per-arch headers.
  */
 
 #if HAVE_BIGENDIAN
 
@@ skipping 97 matching lines @@
 
 #endif /* !HAVE_BIGENDIAN */
 
 /*
  * Define AV_[RW]N helper macros to simplify definitions not provided
  * by per-arch headers.
  */
 
 #if   HAVE_ATTRIBUTE_PACKED
 
-struct unaligned_64 { uint64_t l; } __attribute__((packed));
-struct unaligned_32 { uint32_t l; } __attribute__((packed));
-struct unaligned_16 { uint16_t l; } __attribute__((packed));
+union unaligned_64 { uint64_t l; } __attribute__((packed)) av_alias;
+union unaligned_32 { uint32_t l; } __attribute__((packed)) av_alias;
+union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
 
-#   define AV_RN(s, p) (((const struct unaligned_##s *) (p))->l)
-#   define AV_WN(s, p, v) ((((struct unaligned_##s *) (p))->l) = (v))
+#   define AV_RN(s, p) (((const union unaligned_##s *) (p))->l)
+#   define AV_WN(s, p, v) ((((union unaligned_##s *) (p))->l) = (v))
 
 #elif defined(__DECC)
 
 #   define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p)))
 #   define AV_WN(s, p, v) (*((__unaligned uint##s##_t*)(p)) = (v))
 
 #elif HAVE_FAST_UNALIGNED
 
-#   define AV_RN(s, p) (*((const uint##s##_t*)(p)))
-#   define AV_WN(s, p, v) (*((uint##s##_t*)(p)) = (v))
+#   define AV_RN(s, p) (((const av_alias##s*)(p))->u##s)
+#   define AV_WN(s, p, v) (((av_alias##s*)(p))->u##s = (v))
 
 #else
 
 #ifndef AV_RB16
 #   define AV_RB16(x)                           \
     ((((const uint8_t*)(x))[0] << 8) |          \
       ((const uint8_t*)(x))[1])
 #endif
 #ifndef AV_WB16
 #   define AV_WB16(p, d) do {                   \
@@ skipping 209 matching lines @@
       ((const uint8_t*)(x))[0])
 #endif
 #ifndef AV_WL24
 #   define AV_WL24(p, d) do {                   \
         ((uint8_t*)(p))[0] = (d);               \
         ((uint8_t*)(p))[1] = (d)>>8;            \
         ((uint8_t*)(p))[2] = (d)>>16;           \
     } while(0)
 #endif
 
+/*
+ * The AV_[RW]NA macros access naturally aligned data
+ * in a type-safe way.
+ */
+
+#define AV_RNA(s, p)    (((const av_alias##s*)(p))->u##s)
+#define AV_WNA(s, p, v) (((av_alias##s*)(p))->u##s = (v))
+
+#ifndef AV_RN16A
+#   define AV_RN16A(p) AV_RNA(16, p)
+#endif
+
+#ifndef AV_RN32A
+#   define AV_RN32A(p) AV_RNA(32, p)
+#endif
+
+#ifndef AV_RN64A
+#   define AV_RN64A(p) AV_RNA(64, p)
+#endif
+
+#ifndef AV_WN16A
+#   define AV_WN16A(p, v) AV_WNA(16, p, v)
+#endif
+
+#ifndef AV_WN32A
+#   define AV_WN32A(p, v) AV_WNA(32, p, v)
+#endif
+
+#ifndef AV_WN64A
+#   define AV_WN64A(p, v) AV_WNA(64, p, v)
+#endif
+
 /* Parameters for AV_COPY*, AV_SWAP*, AV_ZERO* must be
  * naturally aligned. They may be implemented using MMX,
  * so emms_c() must be called before using any float code
  * afterwards.
  */
 
-#define AV_COPY(n, d, s) (*(uint##n##_t*)(d) = *(const uint##n##_t*)(s))
+#define AV_COPY(n, d, s) \
+    (((av_alias##n*)(d))->u##n = ((const av_alias##n*)(s))->u##n)
+
+#ifndef AV_COPY16
+#   define AV_COPY16(d, s) AV_COPY(16, d, s)
+#endif
 
 #ifndef AV_COPY32
 #   define AV_COPY32(d, s) AV_COPY(32, d, s)
 #endif
 
 #ifndef AV_COPY64
 #   define AV_COPY64(d, s) AV_COPY(64, d, s)
 #endif
 
 #ifndef AV_COPY128
 #   define AV_COPY128(d, s)                    \
     do {                                       \
         AV_COPY64(d, s);                       \
         AV_COPY64((char*)(d)+8, (char*)(s)+8); \
     } while(0)
 #endif
 
-#define AV_SWAP(n, a, b) FFSWAP(uint##n##_t, *(uint##n##_t*)(a), *(uint##n##_t*)(b))
+#define AV_SWAP(n, a, b) FFSWAP(av_alias##n, *(av_alias##n*)(a), *(av_alias##n*)(b))
 
 #ifndef AV_SWAP64
 #   define AV_SWAP64(a, b) AV_SWAP(64, a, b)
 #endif
 
-#define AV_ZERO(n, d) (*(uint##n##_t*)(d) = 0)
+#define AV_ZERO(n, d) (((av_alias##n*)(d))->u##n = 0)
+
+#ifndef AV_ZERO16
+#   define AV_ZERO16(d) AV_ZERO(16, d)
+#endif
+
+#ifndef AV_ZERO32
+#   define AV_ZERO32(d) AV_ZERO(32, d)
+#endif
 
 #ifndef AV_ZERO64
 #   define AV_ZERO64(d) AV_ZERO(64, d)
 #endif
 
 #ifndef AV_ZERO128
 #   define AV_ZERO128(d)         \
     do {                         \
         AV_ZERO64(d);            \
         AV_ZERO64((char*)(d)+8); \
     } while(0)
 #endif
 
 #endif /* AVUTIL_INTREADWRITE_H */