From 6162042d3c40a7b9e49531e85f288014d56332b0 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Wed, 13 Jul 2016 19:36:19 +0200
Subject: implemented bs1770 converter


diff --git a/rhimport/converter.go b/rhimport/converter.go
index c809c3c..f7bcb0a 100644
--- a/rhimport/converter.go
+++ b/rhimport/converter.go
@@ -52,6 +52,8 @@ func NewFetchConverter(convType, filename string, metadata map[string]string) (F
 		return NewNullFetchConverter(filename, metadata)
 	case "ffmpeg":
 		return NewFFMpegFetchConverter(filename, metadata)
+	case "bs1770":
+		return NewBS1770FetchConverter(filename, metadata)
 	case "ffmpeg-bs1770":
 		return NewFFMpegBS1770FetchConverter(filename, metadata)
 	}
@@ -137,7 +139,75 @@ func (ff *FFMpegFetchConverter) GetResult() (result string, err error, loudnessC
 }
 
 //
-// FFMpeg Converter: converts all files into flac and calculates loudness correction value
+// FFMpeg/BS1770 Converter: converts all files into flac and calculates loudness correction value
+// using ITU BS1770 (EBU R128)
+//
+
+type BS1770FetchConverter struct {
+	cmd    *exec.Cmd
+	file   *os.File
+	pipe   io.WriteCloser
+	multi  io.Writer
+	result chan ConverterResult
+}
+
+func NewBS1770FetchConverter(filename string, metadata map[string]string) (bs *BS1770FetchConverter, newFilename string, err error) {
+	bs = &BS1770FetchConverter{}
+	rhl.Printf("bs1770-converter: opening file '%s'", filename)
+	newFilename = filename
+	bs.file, err = os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0600)
+
+	bs.cmd = exec.Command("bs1770gain", "--ebu", "-i", "--xml", "-")
+	if bs.pipe, err = bs.cmd.StdinPipe(); err != nil {
+		return nil, "", err
+	}
+	bs.multi = io.MultiWriter(bs.file, bs.pipe)
+
+	var bsStdout, bsStderr bytes.Buffer
+	bs.cmd.Stdout = &bsStdout
+	bs.cmd.Stderr = &bsStderr
+
+	bs.result = make(chan ConverterResult, 1)
+	go func() {
+		if err := bs.cmd.Run(); err != nil {
+			bs.result <- ConverterResult{strings.TrimSpace(string(bsStderr.String())), err, 0.0}
+		}
+
+		res, err := NewBS1770ResultFromXML(&bsStdout)
+		if err != nil {
+			bs.result <- ConverterResult{bsStdout.String(), err, 0.0}
+		}
+		if len(res.Album.Tracks) == 0 {
+			bs.result <- ConverterResult{bsStdout.String(), fmt.Errorf("bs1770gain returned no/invalid result"), 0.0}
+		}
+		bs.result <- ConverterResult{"", nil, res.Album.Tracks[0].Integrated.LU}
+	}()
+	return
+}
+
+func (bs *BS1770FetchConverter) Write(p []byte) (n int, err error) {
+	return bs.multi.Write(p)
+}
+
+func (bs *BS1770FetchConverter) Close() (err error) {
+	errPipe := bs.pipe.Close()
+	errFile := bs.file.Close()
+	if errFile != nil {
+		return errFile
+	}
+	return errPipe
+}
+
+func (bs *BS1770FetchConverter) GetResult() (result string, err error, loudnessCorr float64) {
+	if bs.result != nil {
+		r := <-bs.result
+		return r.output, r.err, r.loudnessCorr
+	}
+	return "", nil, 0.0
+}
+
+//
+// FFMpeg/BS1770 Converter: converts all files into flac and calculates loudness correction value
 // using ITU BS1770 (EBU R128)
 //
 
-- 
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