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55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
// Copyright 2016 The Draco Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// File provides basic classes and functions for rANS bit decoding.
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#ifndef DRACO_CORE_ADAPTIVE_RANS_BIT_DECODER_H_
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#define DRACO_CORE_ADAPTIVE_RANS_BIT_DECODER_H_
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#include <vector>
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#include "core/ans.h"
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#include "core/decoder_buffer.h"
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namespace draco {
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// Class for decoding a sequence of bits that were encoded with
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// AdaptiveRAnsBitEncoder.
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class AdaptiveRAnsBitDecoder {
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public:
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AdaptiveRAnsBitDecoder();
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~AdaptiveRAnsBitDecoder();
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// Sets |source_buffer| as the buffer to decode bits from.
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bool StartDecoding(DecoderBuffer *source_buffer);
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// Decode one bit. Returns true if the bit is a 1, otherwise false.
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bool DecodeNextBit();
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// Decode the next |nbits| and return the sequence in |value|. |nbits| must be
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// > 0 and <= 32.
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void DecodeLeastSignificantBits32(int nbits, uint32_t *value);
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void EndDecoding() {}
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private:
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void Clear();
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AnsDecoder ans_decoder_;
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double p0_f_;
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};
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} // namespace draco
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#endif // DRACO_CORE_ADAPTIVE_RANS_BIT_DECODER_H_
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