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- // Copyright 2015 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef MEDIA_FILTERS_IVF_PARSER_H_
- #define MEDIA_FILTERS_IVF_PARSER_H_
- #include <stddef.h>
- #include <stdint.h>
- namespace media {
- const char kIvfHeaderSignature[] = "DKIF";
- #pragma pack(push, 1)
- struct IvfFileHeader {
- // Byte swap interger fields between native and (on disk) little endian.
- void ByteSwap();
- char signature[4]; // signature: 'DKIF'
- uint16_t version; // version (should be 0)
- uint16_t header_size; // size of header in bytes
- uint32_t fourcc; // codec FourCC (e.g., 'VP80')
- uint16_t width; // width in pixels
- uint16_t height; // height in pixels
- uint32_t timebase_denum; // timebase denumerator
- uint32_t timebase_num; // timebase numerator. For example, if
- // timebase_denum is 30 and timebase_num is 2, the
- // unit of IvfFrameHeader.timestamp is 2/30
- // seconds.
- uint32_t num_frames; // number of frames in file
- uint32_t unused; // unused
- };
- static_assert(
- sizeof(IvfFileHeader) == 32,
- "sizeof(IvfFileHeader) must be fixed since it will be used with file IO");
- struct IvfFrameHeader {
- // Byte swap interger fields between native and (on disk) little endian.
- void ByteSwap();
- uint32_t frame_size; // Size of frame in bytes (not including the header)
- uint64_t timestamp; // 64-bit presentation timestamp in unit timebase,
- // which is defined in IvfFileHeader.
- };
- static_assert(
- sizeof(IvfFrameHeader) == 12,
- "sizeof(IvfFrameHeader) must be fixed since it will be used with file IO");
- #pragma pack(pop)
- // IVF is a simple container format for video frame. It is used by libvpx to
- // transport VP8 and VP9 bitstream.
- class IvfParser {
- public:
- IvfParser();
- IvfParser(const IvfParser&) = delete;
- IvfParser& operator=(const IvfParser&) = delete;
- // Initializes the parser for IVF |stream| with size |size| and parses the
- // file header. Returns true on success.
- bool Initialize(const uint8_t* stream,
- size_t size,
- IvfFileHeader* file_header);
- // Parses the next frame. Returns true if the next frame is parsed without
- // error. |frame_header| will be filled with the frame header and |payload|
- // will point to frame payload (inside the |stream| buffer given to
- // Initialize.)
- bool ParseNextFrame(IvfFrameHeader* frame_header, const uint8_t** payload);
- private:
- bool ParseFileHeader(IvfFileHeader* file_header);
- // Current reading position of input stream.
- const uint8_t* ptr_;
- // The end position of input stream.
- const uint8_t* end_;
- };
- } // namespace media
- #endif // MEDIA_FILTERS_IVF_PARSER_H_
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