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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef MEDIA_FILTERS_IVF_PARSER_H_ |
| 6 #define MEDIA_FILTERS_IVF_PARSER_H_ |
| 7 |
| 8 #include <stddef.h> |
| 9 #include <stdint.h> |
| 10 |
| 11 #include "base/macros.h" |
| 12 #include "media/base/media_export.h" |
| 13 |
| 14 namespace media { |
| 15 |
| 16 const char kIvfHeaderSignature[] = "DKIF"; |
| 17 |
| 18 #pragma pack(push, 1) |
| 19 struct MEDIA_EXPORT IvfFileHeader { |
| 20 // Byte swap interger fields between native and (on disk) little endian. |
| 21 void ByteSwap(); |
| 22 |
| 23 char signature[4]; // signature: 'DKIF' |
| 24 uint16_t version; // version (should be 0) |
| 25 uint16_t header_size; // size of header in bytes |
| 26 uint32_t fourcc; // codec FourCC (e.g., 'VP80') |
| 27 uint16_t width; // width in pixels |
| 28 uint16_t height; // height in pixels |
| 29 uint32_t timebase_denum; // timebase denumerator |
| 30 uint32_t timebase_num; // timebase numerator. For example, if |
| 31 // timebase_denum is 30 and timebase_num is 2, the |
| 32 // unit of IvfFrameHeader.timestamp is 2/30 |
| 33 // seconds. |
| 34 uint32_t num_frames; // number of frames in file |
| 35 uint32_t unused; // unused |
| 36 }; |
| 37 static_assert( |
| 38 sizeof(IvfFileHeader) == 32, |
| 39 "sizeof(IvfFileHeader) must be fixed since it will be used with file IO"); |
| 40 |
| 41 struct MEDIA_EXPORT IvfFrameHeader { |
| 42 // Byte swap interger fields between native and (on disk) little endian. |
| 43 void ByteSwap(); |
| 44 |
| 45 uint32_t frame_size; // Size of frame in bytes (not including the header) |
| 46 uint64_t timestamp; // 64-bit presentation timestamp in unit timebase, |
| 47 // which is defined in IvfFileHeader. |
| 48 }; |
| 49 static_assert( |
| 50 sizeof(IvfFrameHeader) == 12, |
| 51 "sizeof(IvfFrameHeader) must be fixed since it will be used with file IO"); |
| 52 #pragma pack(pop) |
| 53 |
| 54 // IVF is a simple container format for video frame. It is used by libvpx to |
| 55 // transport VP8 and VP9 bitstream. |
| 56 class MEDIA_EXPORT IvfParser { |
| 57 public: |
| 58 IvfParser(); |
| 59 |
| 60 // Initializes the parser for IVF |stream| with size |size| and parses the |
| 61 // file header. Returns true on success. |
| 62 bool Initialize(const uint8_t* stream, |
| 63 size_t size, |
| 64 IvfFileHeader* file_header); |
| 65 |
| 66 // Parses the next frame. Returns true if the next frame is parsed without |
| 67 // error. |frame_header| will be filled with the frame header and |payload| |
| 68 // will point to frame payload (inside the |stream| buffer given to |
| 69 // Initialize.) |
| 70 bool ParseNextFrame(IvfFrameHeader* frame_header, const uint8_t** payload); |
| 71 |
| 72 private: |
| 73 bool ParseFileHeader(IvfFileHeader* file_header); |
| 74 |
| 75 // Current reading position of input stream. |
| 76 const uint8_t* ptr_; |
| 77 |
| 78 // The end position of input stream. |
| 79 const uint8_t* end_; |
| 80 |
| 81 DISALLOW_COPY_AND_ASSIGN(IvfParser); |
| 82 }; |
| 83 |
| 84 } // namespace media |
| 85 |
| 86 #endif // MEDIA_FILTERS_IVF_PARSER_H_ |
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