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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_H_
#define LIBGAV1_EXAMPLES_FILE_READER_H_
#include <cstddef>
#include <cstdint>
#include <cstdio>
#include <memory>
#include <string>
#include <vector>
#include "examples/file_reader_interface.h"
namespace libgav1 {
// Temporal Unit based file reader class. Currently supports only IVF files.
class FileReader : public FileReaderInterface {
public:
enum FileType {
kFileTypeUnknown,
kFileTypeIvf,
};
// Creates and returns a FileReader that reads from |file_name|.
// If |error_tolerant| is true format and read errors are ignored,
// ReadTemporalUnit() may return truncated data.
// Returns nullptr when the file does not exist, cannot be read, or is not an
// IVF file.
static std::unique_ptr<FileReaderInterface> Open(const std::string& file_name,
bool error_tolerant = false);
FileReader() = delete;
FileReader(const FileReader&) = delete;
FileReader& operator=(const FileReader&) = delete;
// Closes |file_|.
~FileReader() override;
// Reads a temporal unit from |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 from the IVF frame header.
/*LIBGAV1_MUST_USE_RESULT*/ bool ReadTemporalUnit(
std::vector<uint8_t>* tu_data, int64_t* timestamp) override;
/*LIBGAV1_MUST_USE_RESULT*/ bool IsEndOfFile() const override {
return feof(file_) != 0;
}
// The values returned by these accessors are strictly informative. No
// validation is performed when they are read from the IVF file header.
size_t width() const override { return width_; }
size_t height() const override { return height_; }
size_t frame_rate() const override { return frame_rate_; }
size_t time_scale() const override { return time_scale_; }
private:
FileReader(FILE* file, bool owns_file, bool error_tolerant)
: file_(file), owns_file_(owns_file), error_tolerant_(error_tolerant) {}
bool ReadIvfFileHeader();
FILE* file_ = nullptr;
size_t width_ = 0;
size_t height_ = 0;
size_t frame_rate_ = 0;
size_t time_scale_ = 0;
FileType type_ = kFileTypeUnknown;
// True if this object owns file_ and is responsible for closing it when
// done.
const bool owns_file_;
const bool error_tolerant_;
static bool registered_in_factory_;
};
} // namespace libgav1
#endif // LIBGAV1_EXAMPLES_FILE_READER_H_
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