xc

type ABRSegmentResult struct {
	Errors      []string
	FrameCount  int
	FragCount   int
	Timescale   uint32
	SampleDur   uint64 // most common sample duration
	DtsStart    uint64
	DtsEnd      uint64
	DtsProblems int    // non-consecutive DTS count
	DurProblems int    // unequal duration count
	SeqFirst    uint32 // first mfhd sequence number
	SeqLast     uint32 // last mfhd sequence number
}

type ContinuityProblem struct {
	SampleIndex int
	Field       string // "PTS" or "DTS"
	Expected    uint64
	Actual      uint64
}

type FileInputOpener struct {
	URL         string
	ErrorOnOpen bool     // return fs.ErrPermission from Open
	ErrorOnRead bool     // return io.ErrNoProgress from Read
	Stats       *IOStats // optional stats collector
}

type FileOutputOpener struct {
	Dir   string
	Stats *IOStats // optional stats collector
}

type FramesPerFragment int

type IOStats struct {
	AudioFramesRead         uint64
	VideoFramesRead         uint64
	FirstKeyFramePTS        uint64
	EncodingAudioFrameStats avpipe.EncodingFrameStats
	EncodingVideoFrameStats avpipe.EncodingFrameStats
}

type InitSegmentInfo struct {
	Codec     string
	Width     int
	Height    int
	Timescale uint32
	SPS       [][]byte // Sequence Parameter Sets
	PPS       [][]byte // Picture Parameter Sets
	VPS       [][]byte // Video Parameter Sets (HEVC only)
}

type MezPartParams struct {
	// FrameRate is the video frame rate as a rational number (e.g. 50/1 or 60000/1001).
	FrameRate *big.Rat

	// ABRVideoSegDuration is the duration of each ABR video segment in seconds
	// (e.g. 2.0 for 50fps, or 2.002 for 59.94fps).
	ABRVideoSegDuration *big.Rat

	// ABRAudioSegDuration is the duration of each ABR audio segment in seconds.
	ABRAudioSegDuration *big.Rat

	// ABRSegmentsPerPart is the number of ABR segments per mez part (default 15).
	ABRSegmentsPerPart int

	// FramesPerFrag specifies how many frames are stored per fragment.
	FramesPerFrag FramesPerFragment

	// StartPTS is the expected starting PTS of the part (typically 0).
	StartPTS uint64
}

type MezPartResult struct {
	// Errors collects all validation errors.
	Errors []string

	// ContinuityProblems records specific PTS/DTS continuity issues.
	ContinuityProblems []ContinuityProblem

	// MissingKeyFrames is the number of expected key frames that were not found.
	MissingKeyFrames int

	// FrameCount is the actual number of frames/samples found.
	FrameCount int

	// FragmentCount is the actual number of fragments found.
	FragmentCount int

	// Timescale is the media timescale extracted from the file.
	Timescale uint32

	// SampleDuration is the expected sample duration in timescale units.
	SampleDuration uint64
}