go-dcp/cmd/playback/playback.go

package main

import (
	"encoding/xml"
	"flag"
	"fmt"
	"git.gammaspectra.live/WeebDataHoarder/go-dcp/dcp"
	"git.gammaspectra.live/WeebDataHoarder/go-dcp/utils"
	"os"
	"os/exec"
	"strings"
	"sync"
)

func main() {
	mpvCmd := flag.String("mpv", "mpv", "mpv command path")
	xyz2yuvCmd := flag.String("xyz2yuv", "xyz2yuv", "xyz2yuv command path")

	dcpPath := flag.String("dcp", "", "Path to DCP folder or ASSETMAP")
	pklUUID := flag.String("pkl-id", "", "PKL ID to use. Empty for first PKL found")
	customCPL := flag.String("custom-cpl", "", "Custom CPL path to use.")
	reelIDs := flag.String("drop-reel-ids", "", "IDs of reels to drop. Use to skip ads or logos")

	audioMapping := flag.String("audio-channel-mapping", "auto", "Audio channel mapping, usually 5.1/2.0/1.0 etc. Leave empty to disable")
	doASS := flag.Bool("ass", true, "Encode subtitles if present to ASS")

	width := flag.Int("width", 1998, "Video stream width for subtitles. Default is 2K Flat")
	height := flag.Int("height", 1080, "Video stream height for subtitles. Default is 2K Flat")

	flag.Parse()

	dcPackage, err := dcp.Open(*dcpPath)
	if err != nil {
		panic(err)
	}

	var cpl dcp.CompositionPlaylist

	var dropReelUUIDs []string

	for _, id := range strings.Split(*reelIDs, ",") {
		dropReelUUIDs = append(dropReelUUIDs, utils.CleanUUID(id))
	}

	if *customCPL == "" {
		cpl, err = utils.SelectCPL(dcPackage, *pklUUID)
		if err != nil {
			panic(err)
		}
	} else {
		cplContents, err := os.ReadFile(*customCPL)
		if err != nil {
			panic(err)
		}

		err = xml.Unmarshal(cplContents, &cpl)
		if err != nil {
			panic(err)
		}

		if !(cpl.IsSMPTE() && dcPackage.IsSMPTE()) && !(cpl.IsIOP() && dcPackage.IsIOP()) {
			panic(fmt.Errorf("unexpected namespace %s", cpl.XMLName.Space))
		}
	}

	err = utils.Concat(dcPackage, cpl, utils.ConcatSettings{
		DropReelUUIDs: dropReelUUIDs,
		Subtitles:     *doASS,
		Width:         *width,
		Height:        *height,
	}, func(desc, videoFile, audioFile, subtitleFile string) {
		af := ""

		switch strings.ToLower(strings.ReplaceAll(strings.ReplaceAll(*audioMapping, ".", ""), "-", "")) {
		case "71":
			af = "pan=7.1|c0=c0|c1=c1|c2=c2|c3=c3|c4=c4|c5=c5|c6=c6|c7=c7"
		case "51":
			af = "pan=5.1|c0=c0|c1=c1|c2=c2|c3=c3|c4=c4|c5=c5"
		case "50":
			af = "pan=5.0|c0=c0|c1=c1|c2=c2|c3=c4|c4=c5"
		case "20":
			af = "pan=2.0|c0=c0|c1=c1"
		case "10", "10center":
			af = "pan=1c|c0=c2"
		case "10side", "10fl":
			af = "pan=1c|c0=c0"
		case "10fr":
			af = "pan=1c|c0=c1"

		}

		xyz2yuv := []string{
			"-lowres", "0",
			"-limited",
			"-depth", "10",
			"-in", videoFile,
			//TODO: allow configuring
			"-colorspace", "rec2020_pure24",
			"-out", "-",
		}

		mpv := []string{
			fmt.Sprintf("--force-media-title=%s", desc),
			// allow concat demuxer input files
			"--demuxer-lavf-o=safe=0",
			//"--msg-level=vo=v",

			"--demuxer-max-bytes=4096MiB",
			"--demuxer-max-back-bytes=512M",
			"--cache-secs=30",
			"--demuxer-seekable-cache=yes",
			"--hr-seek=yes",
			"--demuxer-cache-wait=yes",
			"--cache=yes",
			"--force-seekable=yes",

			"-",
			fmt.Sprintf("--vf=format=colormatrix=%s:colorlevels=limited:primaries=%s:gamma=%s", "bt.2020-ncl", "bt.2020", "bt.1886"),

			fmt.Sprintf("--external-file=%s", audioFile),
		}

		if subtitleFile != "" {
			mpv = append(mpv, fmt.Sprintf("--external-file=%s", subtitleFile))
		}

		mpv = append(mpv, "--vid=1", "--aid=1", "--sid=1")

		if af != "" {
			mpv = append(mpv,
				fmt.Sprintf("--af=\"lavfi=%s\"", af),
			)
		}

		xyz2yuvProcess := exec.Command(*xyz2yuvCmd, xyz2yuv...)

		xyz2yuvProcess.Stdin = os.Stdin
		xyz2yuvProcess.Stderr = os.Stderr

		mpvProcess := exec.Command(*mpvCmd, mpv...)

		mpvProcess.Stdin, err = xyz2yuvProcess.StdoutPipe()
		if err != nil {
			panic(err)
		}
		mpvProcess.Stdout = os.Stdout
		mpvProcess.Stderr = os.Stderr

		err = xyz2yuvProcess.Start()
		if err != nil {
			defer xyz2yuvProcess.Process.Release()
			panic(err)
		}

		err = mpvProcess.Start()
		if err != nil {
			defer mpvProcess.Process.Release()
			panic(err)
		}

		var wg sync.WaitGroup

		wg.Add(2)
		go func() {
			defer wg.Done()

			_ = xyz2yuvProcess.Wait()
		}()
		go func() {
			defer wg.Done()
			defer xyz2yuvProcess.Process.Kill()

			_ = mpvProcess.Wait()
		}()

		wg.Wait()
	})
	if err != nil {
		panic(err)
	}

}