hpw421初始版本

2026-06-06 16:49:48 +08:00
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+/******************************************************************************
+ *
+ *  Copyright (C) 2014 The Android Open Source Project
+ *  Copyright 2003 - 2004 Open Interface North America, Inc. All rights reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at:
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ ******************************************************************************/
+
+/**********************************************************************************
+  $Revision: #1 $
+***********************************************************************************/
+
+/**
+@file
+Functions for manipulating input bitstreams.
+
+@ingroup codec_internal
+*/
+
+/**
+@addtogroup codec_internal
+@{
+*/
+
+#include "oi_stddefs.h"
+#include "oi_bitstream.h"
+#include "oi_assert.h"
+
+PRIVATE void OI_BITSTREAM_ReadInit(OI_BITSTREAM *bs,
+                                   const OI_BYTE *buffer)
+{
+    bs->value = ((OI_INT32)buffer[0] << 16) | ((OI_INT32)buffer[1] << 8) | (buffer[2]);
+    bs->ptr.r = buffer + 3;
+    bs->bitPtr = 8;
+}
+
+PRIVATE OI_UINT32 OI_BITSTREAM_ReadUINT(OI_BITSTREAM *bs, OI_UINT bits)
+{
+    OI_UINT32 result;
+
+    OI_BITSTREAM_READUINT(result, bits, bs->ptr.r, bs->value, bs->bitPtr);
+
+    return result;
+}
+
+PRIVATE OI_UINT8 OI_BITSTREAM_ReadUINT4Aligned(OI_BITSTREAM *bs)
+{
+    OI_UINT32 result;
+
+    OI_ASSERT(bs->bitPtr < 16);
+    OI_ASSERT(bs->bitPtr % 4 == 0);
+
+    if (bs->bitPtr == 8) {
+        result = bs->value << 8;
+        bs->bitPtr = 12;
+    } else {
+        result = bs->value << 12;
+        bs->value = (bs->value << 8) | *bs->ptr.r++;
+        bs->bitPtr = 8;
+    }
+    result >>= 28;
+    OI_ASSERT(result < (1u << 4));
+    return (OI_UINT8)result;
+}
+
+PRIVATE OI_UINT8 OI_BITSTREAM_ReadUINT8Aligned(OI_BITSTREAM *bs)
+{
+    OI_UINT32 result;
+    OI_ASSERT(bs->bitPtr == 8);
+
+    result = bs->value >> 16;
+    bs->value = (bs->value << 8) | *bs->ptr.r++;
+
+    return (OI_UINT8)result;
+}
+
+/**
+@}
+*/
+
+