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