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/*
* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_VIDEO_CODING_UTILITY_IVF_FILE_READER_H_
#define MODULES_VIDEO_CODING_UTILITY_IVF_FILE_READER_H_
#include <cstddef>
#include <cstdint>
#include <memory>
#include <optional>
#include <utility>
#include "api/video/encoded_image.h"
#include "api/video/video_codec_type.h"
#include "rtc_base/system/file_wrapper.h"
namespace webrtc {
class IvfFileReader {
public:
// Creates IvfFileReader. Returns nullptr if error acquired.
static std::unique_ptr<IvfFileReader> Create(FileWrapper file);
~IvfFileReader();
IvfFileReader(const IvfFileReader&) = delete;
IvfFileReader& operator=(const IvfFileReader&) = delete;
// Reinitializes reader. Returns false if any error acquired.
bool Reset();
// Returns codec type which was used to create this IVF file and which should
// be used to decode EncodedImages from this file.
VideoCodecType GetVideoCodecType() const { return codec_type_; }
// Returns count of frames in this file.
size_t GetFramesCount() const { return num_frames_; }
// Returns next frame or std::nullopt if any error acquired. Always returns
// std::nullopt after first error was spotted.
std::optional<EncodedImage> NextFrame();
bool HasMoreFrames() const { return num_read_frames_ < num_frames_; }
bool HasError() const { return has_error_; }
uint16_t GetFrameWidth() const { return width_; }
uint16_t GetFrameHeight() const { return height_; }
bool Close();
private:
struct FrameHeader {
size_t frame_size;
int64_t timestamp;
};
explicit IvfFileReader(FileWrapper file) : file_(std::move(file)) {}
// Parses codec type from specified position of the buffer. Codec type
// contains kCodecTypeBytesCount bytes and caller has to ensure that buffer
// won't overflow.
std::optional<VideoCodecType> ParseCodecType(uint8_t* buffer,
size_t start_pos);
std::optional<FrameHeader> ReadNextFrameHeader();
VideoCodecType codec_type_;
size_t num_frames_;
size_t num_read_frames_;
uint16_t width_;
uint16_t height_;
uint32_t time_scale_;
FileWrapper file_;
std::optional<FrameHeader> next_frame_header_;
bool has_error_;
};
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_UTILITY_IVF_FILE_READER_H_
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