1 files changed, 128 insertions, 0 deletions
diff --git a/libvpx/vp8/encoder/boolhuff.h b/libvpx/vp8/encoder/boolhuff.h
new file mode 100644
index 0000000..8309063
--- /dev/null
+++ b/libvpx/vp8/encoder/boolhuff.h
@@ -0,0 +1,128 @@
+/*
+ *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/****************************************************************************
+*
+*   Module Title :     boolhuff.h
+*
+*   Description  :     Bool Coder header file.
+*
+****************************************************************************/
+#ifndef __INC_BOOLHUFF_H
+#define __INC_BOOLHUFF_H
+
+#include "vpx_ports/mem.h"
+#include "vpx/internal/vpx_codec_internal.h"
+
+typedef struct
+{
+    unsigned int lowvalue;
+    unsigned int range;
+    int count;
+    unsigned int pos;
+    unsigned char *buffer;
+    unsigned char *buffer_end;
+    struct vpx_internal_error_info *error;
+
+    /* Variables used to track bit costs without outputing to the bitstream */
+    unsigned int  measure_cost;
+    unsigned long bit_counter;
+} BOOL_CODER;
+
+extern void vp8_start_encode(BOOL_CODER *bc, unsigned char *buffer, unsigned char *buffer_end);
+
+extern void vp8_encode_value(BOOL_CODER *br, int data, int bits);
+extern void vp8_stop_encode(BOOL_CODER *bc);
+extern const unsigned int vp8_prob_cost[256];
+
+
+DECLARE_ALIGNED(16, extern const unsigned char, vp8_norm[256]);
+
+static int validate_buffer(const unsigned char *start,
+                           size_t               len,
+                           const unsigned char *end,
+                           struct vpx_internal_error_info *error)
+{
+    if (start + len > start && start + len < end)
+        return 1;
+    else
+        vpx_internal_error(error, VPX_CODEC_CORRUPT_FRAME,
+            "Truncated packet or corrupt partition ");
+
+    return 0;
+}
+static void vp8_encode_bool(BOOL_CODER *br, int bit, int probability)
+{
+    unsigned int split;
+    int count = br->count;
+    unsigned int range = br->range;
+    unsigned int lowvalue = br->lowvalue;
+    register unsigned int shift;
+
+#ifdef ENTROPY_STATS
+#if defined(SECTIONBITS_OUTPUT)
+
+    if (bit)
+        Sectionbits[active_section] += vp8_prob_cost[255-probability];
+    else
+        Sectionbits[active_section] += vp8_prob_cost[probability];
+
+#endif
+#endif
+
+    split = 1 + (((range - 1) * probability) >> 8);
+
+    range = split;
+
+    if (bit)
+    {
+        lowvalue += split;
+        range = br->range - split;
+    }
+
+    shift = vp8_norm[range];
+
+    range <<= shift;
+    count += shift;
+
+    if (count >= 0)
+    {
+        int offset = shift - count;
+
+        if ((lowvalue << (offset - 1)) & 0x80000000)
+        {
+            int x = br->pos - 1;
+
+            while (x >= 0 && br->buffer[x] == 0xff)
+            {
+                br->buffer[x] = (unsigned char)0;
+                x--;
+            }
+
+            br->buffer[x] += 1;
+        }
+
+        validate_buffer(br->buffer + br->pos, 1, br->buffer_end, br->error);
+        br->buffer[br->pos++] = (lowvalue >> (24 - offset));
+
+        lowvalue <<= offset;
+        shift = count;
+        lowvalue &= 0xffffff;
+        count -= 8 ;
+    }
+
+    lowvalue <<= shift;
+    br->count = count;
+    br->lowvalue = lowvalue;
+    br->range = range;
+}
+
+#endif