package stream

import (
	"io"

	"git.kingecg.top/kingecg/goffmpeg/pkg/ffmpeg"
)

// TranscodeOptions defines options for stream transcode/transform
type TranscodeOptions struct {
	// Input options
	InputURL string    // rtsp://, http://, https://, ws://, or file path
	InputIO  io.Reader // If set, InputURL is ignored (data piped to FFmpeg)

	// Output options
	OutputFormat string // Output container format: "mp4", "flv", "mkv", "raw"
	VideoCodec   string // Video codec: "libx264", "libvpx", "copy", empty = no video
	AudioCodec   string // Audio codec: "aac", "mp3", "copy", empty = no audio

	// Video options
	VideoWidth     int
	VideoHeight    int
	VideoBitRate   int64
	FrameRate      ffmpeg.Rational
	PixelFormat    string
	VideoFilter    string // FFmpeg video filter string

	// Audio options
	AudioBitRate    int64
	AudioSampleRate int
	AudioChannels   int
	AudioFilter     string // FFmpeg audio filter string

	// General options
	BufferSize int // Internal buffer size (default 4096)
}

// Validate validates the options
func (o *TranscodeOptions) Validate() error {
	// At least one input required
	if o.InputURL == "" && o.InputIO == nil {
		return ErrNoInput
	}

	// Buffer size default
	if o.BufferSize <= 0 {
		o.BufferSize = 4096
	}

	return nil
}