apache--brpc
wehub-resource-sync
64 行
1.9 KiB
C++
64 行
1.9 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#ifndef BRPC_DETAILS_RTMP_UTILS_H
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#define BRPC_DETAILS_RTMP_UTILS_H
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#include <stdint.h> // int32_t
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#include <stddef.h> // size_t
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namespace brpc {
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// Extract bits one by one from the bytes.
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class BitStream {
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public:
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BitStream(const void* data, size_t len)
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: _data(data), _data_end((const char*)data + len), _shift(7) {}
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~BitStream() {}
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// True if no bits any more.
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bool empty() { return _data == _data_end; }
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// Read one bit from the data. empty() must be checked before calling
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// this function, otherwise the behavior is undefined.
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int8_t read_bit() {
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const int8_t* p = (const int8_t*)_data;
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int8_t result = (*p >> _shift) & 0x1;
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if (_shift == 0) {
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_shift = 7;
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_data = p + 1;
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} else {
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--_shift;
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}
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return result;
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}
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private:
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const void* _data;
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const void* const _data_end;
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int _shift;
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};
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int avc_nalu_read_uev(BitStream* stream, int32_t* v);
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int avc_nalu_read_bit(BitStream* stream, int8_t* v);
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} // namespace brpc
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#endif // BRPC_DETAILS_RTMP_UTILS_H
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