summaryrefslogtreecommitdiff
path: root/media/stagefright/foundation/ABitReader.h
diff options
context:
space:
mode:
Diffstat (limited to 'media/stagefright/foundation/ABitReader.h')
-rw-r--r--media/stagefright/foundation/ABitReader.h53
1 files changed, 53 insertions, 0 deletions
diff --git a/media/stagefright/foundation/ABitReader.h b/media/stagefright/foundation/ABitReader.h
new file mode 100644
index 0000000..5135211
--- /dev/null
+++ b/media/stagefright/foundation/ABitReader.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef A_BIT_READER_H_
+
+#define A_BIT_READER_H_
+
+#include <media/stagefright/foundation/ABase.h>
+
+#include <sys/types.h>
+#include <stdint.h>
+
+namespace android {
+
+struct ABitReader {
+ ABitReader(const uint8_t *data, size_t size);
+
+ uint32_t getBits(size_t n);
+ void skipBits(size_t n);
+
+ size_t numBitsLeft() const;
+
+ const uint8_t *data() const;
+
+private:
+ const uint8_t *mData;
+ size_t mSize;
+
+ uint32_t mReservoir; // left-aligned bits
+ size_t mNumBitsLeft;
+
+ void fillReservoir();
+ void putBits(uint32_t x, size_t n);
+
+ DISALLOW_EVIL_CONSTRUCTORS(ABitReader);
+};
+
+} // namespace android
+
+#endif // A_BIT_READER_H_