Initial revision

Originally committed as revision 5 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 68 insertions, 0 deletions

diff --git a/libavcodec/libac3/bitstream.h b/libavcodec/libac3/bitstream.h
new file mode 100644
index 0000000000..84f3287c87
--- /dev/null
+++ b/libavcodec/libac3/bitstream.h
@@ -0,0 +1,68 @@
+/* 
+ *  bitstream.h
+ *
+ *	Copyright (C) Aaron Holtzman - Dec 1999
+ *
+ *  This file is part of ac3dec, a free AC-3 audio decoder
+ *	
+ *  ac3dec is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *   
+ *  ac3dec 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 General Public License for more details.
+ *   
+ *  You should have received a copy of the GNU General Public License
+ *  along with GNU Make; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
+ *
+ */
+
+//My new and improved vego-matic endian swapping routine
+//(stolen from the kernel)
+#ifdef WORDS_BIGENDIAN
+
+#	define swab32(x) (x)
+
+#else
+
+#	if defined (__i386__)
+
+#	define swab32(x) __i386_swab32(x)
+	static inline const uint32_t __i386_swab32(uint32_t x)
+	{
+		__asm__("bswap %0" : "=r" (x) : "0" (x));
+		return x;
+	}
+
+#	else
+
+#	define swab32(x)\
+((((uint8_t*)&x)[0] << 24) | (((uint8_t*)&x)[1] << 16) |  \
+ (((uint8_t*)&x)[2] << 8)  | (((uint8_t*)&x)[3]))
+
+#	endif
+#endif
+
+extern uint32_t bits_left;
+extern uint32_t current_word;
+
+void bitstream_set_ptr (uint8_t * buf);
+uint32_t bitstream_get_bh(uint32_t num_bits);
+
+static inline uint32_t 
+bitstream_get(uint32_t num_bits)
+{
+    uint32_t result;
+	
+    if(num_bits < bits_left) {
+	result = (current_word << (32 - bits_left)) >> (32 - num_bits);
+	bits_left -= num_bits;
+	return result;
+    }
+
+    return bitstream_get_bh(num_bits);
+}