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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>
#include "base/macros.h"
#include "media/base/media_export.h"
namespace media {
const char kIvfHeaderSignature[] = "DKIF";
#pragma pack(push, 1)
struct MEDIA_EXPORT 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 MEDIA_EXPORT 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 MEDIA_EXPORT IvfParser {
public:
IvfParser();
// 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_;
DISALLOW_COPY_AND_ASSIGN(IvfParser);
};
} // namespace media
#endif // MEDIA_FILTERS_IVF_PARSER_H_
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