103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
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/*
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* Copyright 2019 The libgav1 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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#ifndef LIBGAV1_EXAMPLES_FILE_WRITER_H_
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#define LIBGAV1_EXAMPLES_FILE_WRITER_H_
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#include <cstddef>
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#include <cstdint>
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#include <cstdio>
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#include <memory>
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#include <string>
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#include "gav1/decoder_buffer.h"
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namespace libgav1 {
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// Frame based file writer class. Supports only Y4M (YUV4MPEG2) and RAW output.
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class FileWriter {
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public:
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enum FileType : uint8_t {
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kFileTypeRaw,
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kFileTypeY4m,
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};
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struct Y4mParameters {
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Y4mParameters() = default;
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Y4mParameters(size_t width, size_t height, size_t frame_rate_numerator,
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size_t frame_rate_denominator,
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ChromaSamplePosition chroma_sample_position,
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ImageFormat image_format, size_t bitdepth)
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: width(width),
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height(height),
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frame_rate_numerator(frame_rate_numerator),
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frame_rate_denominator(frame_rate_denominator),
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chroma_sample_position(chroma_sample_position),
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image_format(image_format),
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bitdepth(bitdepth) {}
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Y4mParameters(const Y4mParameters& rhs) = default;
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Y4mParameters& operator=(const Y4mParameters& rhs) = default;
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Y4mParameters(Y4mParameters&& rhs) = default;
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Y4mParameters& operator=(Y4mParameters&& rhs) = default;
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size_t width = 0;
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size_t height = 0;
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size_t frame_rate_numerator = 30;
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size_t frame_rate_denominator = 1;
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ChromaSamplePosition chroma_sample_position = kChromaSamplePositionUnknown;
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ImageFormat image_format = kImageFormatYuv420;
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size_t bitdepth = 8;
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};
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// Opens |file_name|. When |file_type| is kFileTypeY4m the Y4M file header is
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// written out to |file_| before this method returns.
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//
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// Returns a FileWriter instance after the file is opened successfully for
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// kFileTypeRaw files, and after the Y4M file header bytes are written for
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// kFileTypeY4m files. Returns nullptr upon failure.
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static std::unique_ptr<FileWriter> Open(const std::string& file_name,
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FileType type,
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const Y4mParameters* y4m_parameters);
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FileWriter() = delete;
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FileWriter(const FileWriter&) = delete;
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FileWriter& operator=(const FileWriter&) = delete;
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FileWriter(FileWriter&&) = default;
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FileWriter& operator=(FileWriter&&) = default;
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// Closes |file_|.
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~FileWriter();
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// Writes the frame data in |frame_buffer| to |file_|. Returns true after
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// successful write of |frame_buffer| data.
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/*LIBGAV1_MUST_USE_RESULT*/ bool WriteFrame(
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const DecoderBuffer& frame_buffer);
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private:
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explicit FileWriter(FILE* file) : file_(file) {}
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bool WriteY4mFileHeader(const Y4mParameters& y4m_parameters);
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FILE* file_ = nullptr;
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FileType file_type_ = kFileTypeRaw;
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};
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} // namespace libgav1
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#endif // LIBGAV1_EXAMPLES_FILE_WRITER_H_
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