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/*
* Copyright 2019 The libgav1 Authors
*
* 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 LIBGAV1_EXAMPLES_FILE_READER_INTERFACE_H_
#define LIBGAV1_EXAMPLES_FILE_READER_INTERFACE_H_
#include <cstddef>
#include <cstdint>
#include <vector>
namespace libgav1 {
class FileReaderInterface {
public:
FileReaderInterface() = default;
FileReaderInterface(const FileReaderInterface&) = delete;
FileReaderInterface& operator=(const FileReaderInterface&) = delete;
FileReaderInterface(FileReaderInterface&&) = default;
FileReaderInterface& operator=(FileReaderInterface&&) = default;
// Closes the file.
virtual ~FileReaderInterface() = default;
// Reads a temporal unit from the file and writes the data to |tu_data|.
// Returns true when:
// - A temporal unit is read successfully, or
// - At end of file.
// When ReadTemporalUnit() is called at the end of the file, it will return
// true without writing any data to |tu_data|.
//
// The |timestamp| pointer is optional: callers not interested in timestamps
// can pass nullptr. When |timestamp| is not a nullptr, this function returns
// the presentation timestamp of the temporal unit.
/*LIBGAV1_MUST_USE_RESULT*/ virtual bool ReadTemporalUnit(
std::vector<uint8_t>* tu_data, int64_t* timestamp) = 0;
/*LIBGAV1_MUST_USE_RESULT*/ virtual bool IsEndOfFile() const = 0;
// The values returned by these accessors are strictly informative. No
// validation is performed when they are read from file.
virtual size_t width() const = 0;
virtual size_t height() const = 0;
virtual size_t frame_rate() const = 0;
virtual size_t time_scale() const = 0;
};
} // namespace libgav1
#endif // LIBGAV1_EXAMPLES_FILE_READER_INTERFACE_H_
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