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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_WRITER_H_
#define LIBGAV1_EXAMPLES_FILE_WRITER_H_
#include <cstddef>
#include <cstdint>
#include <cstdio>
#include <memory>
#include <string>
#include "gav1/decoder_buffer.h"
namespace libgav1 {
// Frame based file writer class. Supports only Y4M (YUV4MPEG2) and RAW output.
class FileWriter {
public:
enum FileType : uint8_t {
kFileTypeRaw,
kFileTypeY4m,
};
struct Y4mParameters {
Y4mParameters() = default;
Y4mParameters(size_t width, size_t height, size_t frame_rate_numerator,
size_t frame_rate_denominator,
ChromaSamplePosition chroma_sample_position,
ImageFormat image_format, size_t bitdepth)
: width(width),
height(height),
frame_rate_numerator(frame_rate_numerator),
frame_rate_denominator(frame_rate_denominator),
chroma_sample_position(chroma_sample_position),
image_format(image_format),
bitdepth(bitdepth) {}
Y4mParameters(const Y4mParameters& rhs) = default;
Y4mParameters& operator=(const Y4mParameters& rhs) = default;
Y4mParameters(Y4mParameters&& rhs) = default;
Y4mParameters& operator=(Y4mParameters&& rhs) = default;
size_t width = 0;
size_t height = 0;
size_t frame_rate_numerator = 30;
size_t frame_rate_denominator = 1;
ChromaSamplePosition chroma_sample_position = kChromaSamplePositionUnknown;
ImageFormat image_format = kImageFormatYuv420;
size_t bitdepth = 8;
};
// Opens |file_name|. When |file_type| is kFileTypeY4m the Y4M file header is
// written out to |file_| before this method returns.
//
// Returns a FileWriter instance after the file is opened successfully for
// kFileTypeRaw files, and after the Y4M file header bytes are written for
// kFileTypeY4m files. Returns nullptr upon failure.
static std::unique_ptr<FileWriter> Open(const std::string& file_name,
FileType type,
const Y4mParameters* y4m_parameters);
FileWriter() = delete;
FileWriter(const FileWriter&) = delete;
FileWriter& operator=(const FileWriter&) = delete;
FileWriter(FileWriter&&) = default;
FileWriter& operator=(FileWriter&&) = default;
// Closes |file_|.
~FileWriter();
// Writes the frame data in |frame_buffer| to |file_|. Returns true after
// successful write of |frame_buffer| data.
/*LIBGAV1_MUST_USE_RESULT*/ bool WriteFrame(
const DecoderBuffer& frame_buffer);
private:
explicit FileWriter(FILE* file) : file_(file) {}
bool WriteY4mFileHeader(const Y4mParameters& y4m_parameters);
FILE* file_ = nullptr;
FileType file_type_ = kFileTypeRaw;
};
} // namespace libgav1
#endif // LIBGAV1_EXAMPLES_FILE_WRITER_H_
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