(61d00a474) v0.9.7.1

2020-03-04 13:04:10 +01:00
parent 3c50efa5c9
commit 3c09ebe02f
5086 changed files with 786063 additions and 295871 deletions
@@ -0,0 +1,113 @@
+/*
+ *  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 VPX_VP8_ENCODER_BOOLHUFF_H_
+#define VPX_VP8_ENCODER_BOOLHUFF_H_
+
+#include "vpx_ports/mem.h"
+#include "vpx/internal/vpx_codec_internal.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+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;
+} BOOL_CODER;
+
+void vp8_start_encode(BOOL_CODER *bc, unsigned char *source,
+                      unsigned char *source_end);
+
+void vp8_encode_value(BOOL_CODER *bc, int data, int bits);
+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 *bc, int bit, int probability) {
+  unsigned int split;
+  int count = bc->count;
+  unsigned int range = bc->range;
+  unsigned int lowvalue = bc->lowvalue;
+  int shift;
+
+  split = 1 + (((range - 1) * probability) >> 8);
+
+  range = split;
+
+  if (bit) {
+    lowvalue += split;
+    range = bc->range - split;
+  }
+
+  shift = vp8_norm[range];
+
+  range <<= shift;
+  count += shift;
+
+  if (count >= 0) {
+    int offset = shift - count;
+
+    if ((lowvalue << (offset - 1)) & 0x80000000) {
+      int x = bc->pos - 1;
+
+      while (x >= 0 && bc->buffer[x] == 0xff) {
+        bc->buffer[x] = (unsigned char)0;
+        x--;
+      }
+
+      bc->buffer[x] += 1;
+    }
+
+    validate_buffer(bc->buffer + bc->pos, 1, bc->buffer_end, bc->error);
+    bc->buffer[bc->pos++] = (lowvalue >> (24 - offset) & 0xff);
+
+    lowvalue <<= offset;
+    shift = count;
+    lowvalue &= 0xffffff;
+    count -= 8;
+  }
+
+  lowvalue <<= shift;
+  bc->count = count;
+  bc->lowvalue = lowvalue;
+  bc->range = range;
+}
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // VPX_VP8_ENCODER_BOOLHUFF_H_