Add Linux support for downloading and setting up FFmpeg.

This commit introduces platform-specific functionality for downloading, extracting, and configuring FFmpeg on Linux systems.

.gitignore

@@ -1 +1,2 @@
 fyne-cross/*
+ffmpeg/*

convertor/view_setting_button_download_ffmpeg_anyos.go

@@ -1,5 +1,5 @@
-//go:build !windows
-// +build !windows
+//go:build !windows && !linux
+// +build !windows,!linux
 
 package convertor
 

convertor/view_setting_button_download_ffmpeg_linux.go

@@ -0,0 +1,63 @@
+//go:build linux
+// +build linux
+
+package convertor
+
+import (
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/canvas"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/widget"
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+	"golang.org/x/image/colornames"
+	"image/color"
+)
+
+func (v View) blockDownloadFFmpeg(
+	donwloadFFmpeg func(progressBar *widget.ProgressBar, progressMessage *canvas.Text) error,
+) *fyne.Container {
+
+	errorDownloadFFmpegMessage := canvas.NewText("", color.RGBA{R: 255, G: 0, B: 0, A: 255})
+	errorDownloadFFmpegMessage.TextSize = 16
+	errorDownloadFFmpegMessage.TextStyle = fyne.TextStyle{Bold: true}
+
+	progressDownloadFFmpegMessage := canvas.NewText("", color.RGBA{R: 49, G: 127, B: 114, A: 255})
+	progressDownloadFFmpegMessage.TextSize = 16
+	progressDownloadFFmpegMessage.TextStyle = fyne.TextStyle{Bold: true}
+
+	progressBar := widget.NewProgressBar()
+
+	var buttonDownloadFFmpeg *widget.Button
+
+	buttonDownloadFFmpeg = widget.NewButton(v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+		MessageID: "download",
+	}), func() {
+		buttonDownloadFFmpeg.Disable()
+
+		err := donwloadFFmpeg(progressBar, progressDownloadFFmpegMessage)
+		if err != nil {
+			errorDownloadFFmpegMessage.Text = err.Error()
+		}
+
+		buttonDownloadFFmpeg.Enable()
+	})
+
+	downloadFFmpegFromSiteMessage := v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+		MessageID: "downloadFFmpegFromSite",
+	})
+
+	return container.NewVBox(
+		canvas.NewLine(colornames.Darkgreen),
+		widget.NewCard(v.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+			MessageID: "buttonDownloadFFmpeg",
+		}), "", container.NewVBox(
+			widget.NewRichTextFromMarkdown(
+				downloadFFmpegFromSiteMessage+" [https://github.com/BtbN/FFmpeg-Builds/releases](https://github.com/BtbN/FFmpeg-Builds/releases)",
+			),
+			buttonDownloadFFmpeg,
+			errorDownloadFFmpegMessage,
+			progressDownloadFFmpegMessage,
+			progressBar,
+		)),
+	)
+}

go.mod

@@ -34,6 +34,7 @@ require (
 	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef // indirect
 	github.com/stretchr/testify v1.8.4 // indirect
 	github.com/tevino/abool v1.2.0 // indirect
+	github.com/ulikunitz/xz v0.5.12 // indirect
 	github.com/yuin/goldmark v1.5.5 // indirect
 	golang.org/x/image v0.11.0 // indirect
 	golang.org/x/mobile v0.0.0-20230531173138-3c911d8e3eda // indirect

go.sum

@@ -288,6 +288,8 @@ github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXl
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
 github.com/tevino/abool v1.2.0 h1:heAkClL8H6w+mK5md9dzsuohKeXHUpY7Vw0ZCKW+huA=
 github.com/tevino/abool v1.2.0/go.mod h1:qc66Pna1RiIsPa7O4Egxxs9OqkuxDX55zznh9K07Tzg=
+github.com/ulikunitz/xz v0.5.12 h1:37Nm15o69RwBkXM0J6A5OlE67RZTfzUxTj8fB3dfcsc=
+github.com/ulikunitz/xz v0.5.12/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=

handler/convertor_anyos.go

@@ -1,5 +1,5 @@
-//go:build !windows
-// +build !windows
+//go:build !windows && !linux
+// +build !windows,!linux
 
 package handler
 

handler/convertor_linux.go

@@ -0,0 +1,208 @@
+//go:build linux
+// +build linux
+
+package handler
+
+import (
+	"archive/tar"
+	"errors"
+	"fyne.io/fyne/v2/canvas"
+	"fyne.io/fyne/v2/widget"
+	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/kernel"
+	"github.com/nicksnyder/go-i18n/v2/i18n"
+	"github.com/ulikunitz/xz"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+)
+
+func getPathsToFF() []kernel.FFPathUtilities {
+	return []kernel.FFPathUtilities{{"ffmpeg/bin/ffmpeg", "ffmpeg/bin/ffprobe"}, {"ffmpeg", "ffprobe"}}
+}
+
+func (h ConvertorHandler) downloadFFmpeg(progressBar *widget.ProgressBar, progressMessage *canvas.Text) (err error) {
+	isDirectoryFFmpeg := isDirectory("ffmpeg")
+	if isDirectoryFFmpeg == false {
+		err = os.Mkdir("ffmpeg", 0777)
+		if err != nil {
+			return err
+		}
+	}
+	progressMessage.Text = h.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+		MessageID: "downloadRun",
+	})
+	progressMessage.Refresh()
+	err = downloadFile("ffmpeg/ffmpeg.tar.xz", "https://github.com/BtbN/FFmpeg-Builds/releases/download/latest/ffmpeg-master-latest-linux64-gpl.tar.xz", progressBar)
+	if err != nil {
+		return err
+	}
+
+	progressMessage.Text = h.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+		MessageID: "unzipRun",
+	})
+	progressMessage.Refresh()
+	err = unTarXz("ffmpeg/ffmpeg.tar.xz", "ffmpeg", progressBar)
+	if err != nil {
+		return err
+	}
+	_ = os.Remove("ffmpeg/ffmpeg.tar.xz")
+
+	progressMessage.Text = h.app.GetLocalizerService().GetMessage(&i18n.LocalizeConfig{
+		MessageID: "testFF",
+	})
+	progressMessage.Refresh()
+
+	err = h.saveSettingFFPath("ffmpeg/ffmpeg-master-latest-linux64-gpl/bin/ffmpeg", "ffmpeg/ffmpeg-master-latest-linux64-gpl/bin/ffprobe")
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func downloadFile(filepath string, url string, progressBar *widget.ProgressBar) (err error) {
+	progressBar.Value = 0
+	progressBar.Max = 100
+
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return err
+	}
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	f, err := os.OpenFile(filepath, os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	buf := make([]byte, 32*1024)
+	var downloaded int64
+	for {
+		n, err := resp.Body.Read(buf)
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+			return err
+		}
+		if n > 0 {
+			f.Write(buf[:n])
+			downloaded += int64(n)
+			progressBar.Value = float64(downloaded) / float64(resp.ContentLength) * 100
+			progressBar.Refresh()
+		}
+	}
+	return nil
+}
+
+func unTarXz(fileTar string, directory string, progressBar *widget.ProgressBar) error {
+	progressBar.Value = 0
+	progressBar.Max = 100
+
+	f, err := os.Open(fileTar)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	xzReader, err := xz.NewReader(f)
+	if err != nil {
+		return err
+	}
+
+	tarReader := tar.NewReader(xzReader)
+
+	totalFiles := 0
+	for {
+		_, err := tarReader.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return err
+		}
+		totalFiles++
+	}
+
+	// Rewind back to the beginning of the file to re-process
+	_, err = f.Seek(0, 0)
+	if err != nil {
+		return err
+	}
+
+	xzReader, err = xz.NewReader(f)
+	if err != nil {
+		return err
+	}
+
+	tarReader = tar.NewReader(xzReader)
+
+	// We count the number of files already unpacked
+	unpackedFiles := 0
+
+	for {
+		header, err := tarReader.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return err
+		}
+
+		targetPath := filepath.Join(directory, header.Name)
+		switch header.Typeflag {
+		case tar.TypeDir:
+			err := os.MkdirAll(targetPath, 0755)
+			if err != nil {
+				return err
+			}
+		case tar.TypeReg:
+			outFile, err := os.Create(targetPath)
+			if err != nil {
+				return err
+			}
+			defer outFile.Close()
+
+			_, err = io.Copy(outFile, tarReader)
+
+			if err != nil {
+				return err
+			}
+		default:
+			return errors.New("unsupported file type")
+		}
+
+		unpackedFiles++
+		progressBar.Value = float64(unpackedFiles) / float64(totalFiles) * 100
+		progressBar.Refresh()
+	}
+
+	ffmpegPath := filepath.Join(directory, "ffmpeg-master-latest-linux64-gpl", "bin", "ffmpeg")
+	err = os.Chmod(ffmpegPath, 0755)
+	if err != nil {
+		return err
+	}
+
+	ffprobePath := filepath.Join(directory, "ffmpeg-master-latest-linux64-gpl", "bin", "ffprobe")
+	err = os.Chmod(ffprobePath, 0755)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func isDirectory(path string) bool {
+	fileInfo, err := os.Stat(path)
+	if err != nil {
+		return false
+	}
+
+	return fileInfo.IsDir()
+}