From 139e9fae3956443bcdeaa120d7f9349901275e82 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Wed, 13 Jul 2016 23:48:21 +0200
Subject: also reduce/increase channels from source file


diff --git a/rhimport/converter.go b/rhimport/converter.go
index dab3309..f842ef3 100644
--- a/rhimport/converter.go
+++ b/rhimport/converter.go
@@ -32,6 +32,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"strconv"
 	"strings"
 )
 
@@ -46,16 +47,16 @@ type FetchConverterResult struct {
 	loudnessCorr float64
 }
 
-func NewFetchConverter(convType, filename string, metadata map[string]string) (FetchConverter, string, error) {
+func NewFetchConverter(convType, filename string, metadata map[string]string, channels uint) (FetchConverter, string, error) {
 	switch convType {
 	case "null":
-		return NewNullFetchConverter(filename, metadata)
+		return NewNullFetchConverter(filename, metadata, channels)
 	case "ffmpeg":
-		return NewFFMpegFetchConverter(filename, metadata)
+		return NewFFMpegFetchConverter(filename, metadata, channels)
 	case "bs1770":
-		return NewBS1770FetchConverter(filename, metadata)
+		return NewBS1770FetchConverter(filename, metadata, channels)
 	case "ffmpeg-bs1770":
-		return NewFFMpegBS1770FetchConverter(filename, metadata)
+		return NewFFMpegBS1770FetchConverter(filename, metadata, channels)
 	}
 	return nil, "", errors.New("unknown fetch converter type: " + convType)
 }
@@ -68,7 +69,7 @@ type NullFetchConverter struct {
 	file *os.File
 }
 
-func NewNullFetchConverter(filename string, metadata map[string]string) (n *NullFetchConverter, newFilename string, err error) {
+func NewNullFetchConverter(filename string, metadata map[string]string, channels uint) (n *NullFetchConverter, newFilename string, err error) {
 	n = &NullFetchConverter{}
 	rhl.Printf("null-converter: opening file '%s'", filename)
 	newFilename = filename
@@ -98,7 +99,7 @@ type FFMpegFetchConverter struct {
 	result chan FetchConverterResult
 }
 
-func NewFFMpegFetchConverter(filename string, metadata map[string]string) (ff *FFMpegFetchConverter, filenameFlac string, err error) {
+func NewFFMpegFetchConverter(filename string, metadata map[string]string, channels uint) (ff *FFMpegFetchConverter, filenameFlac string, err error) {
 	ff = &FFMpegFetchConverter{}
 	ext := filepath.Ext(filename)
 	filenameFlac = strings.TrimSuffix(filename, ext) + ".flac"
@@ -109,7 +110,7 @@ func NewFFMpegFetchConverter(filename string, metadata map[string]string) (ff *F
 			ff.cmd.Args = append(ff.cmd.Args, "-metadata", fmt.Sprintf("%s=%s", key, value))
 		}
 	}
-	ff.cmd.Args = append(ff.cmd.Args, "-f", "flac", filenameFlac)
+	ff.cmd.Args = append(ff.cmd.Args, "-ac", strconv.FormatUint(uint64(channels), 10), "-f", "flac", filenameFlac)
 	if ff.pipe, err = ff.cmd.StdinPipe(); err != nil {
 		return nil, "", err
 	}
@@ -150,7 +151,7 @@ type BS1770FetchConverter struct {
 	result chan FetchConverterResult
 }
 
-func NewBS1770FetchConverter(filename string, metadata map[string]string) (bs *BS1770FetchConverter, newFilename string, err error) {
+func NewBS1770FetchConverter(filename string, metadata map[string]string, channels uint) (bs *BS1770FetchConverter, newFilename string, err error) {
 	bs = &BS1770FetchConverter{}
 	rhl.Printf("bs1770-converter: opening file '%s'", filename)
 	newFilename = filename
@@ -218,7 +219,7 @@ type FFMpegBS1770FetchConverter struct {
 	resultBS chan FetchConverterResult
 }
 
-func NewFFMpegBS1770FetchConverter(filename string, metadata map[string]string) (ff *FFMpegBS1770FetchConverter, filenameFlac string, err error) {
+func NewFFMpegBS1770FetchConverter(filename string, metadata map[string]string, channels uint) (ff *FFMpegBS1770FetchConverter, filenameFlac string, err error) {
 	ff = &FFMpegBS1770FetchConverter{}
 	ext := filepath.Ext(filename)
 	filenameFlac = strings.TrimSuffix(filename, ext) + ".flac"
@@ -229,7 +230,8 @@ func NewFFMpegBS1770FetchConverter(filename string, metadata map[string]string)
 			ff.ffmpeg.Args = append(ff.ffmpeg.Args, "-metadata", fmt.Sprintf("%s=%s", key, value))
 		}
 	}
-	ff.ffmpeg.Args = append(ff.ffmpeg.Args, "-f", "flac", filenameFlac, "-f", "flac", "pipe:1")
+	ff.ffmpeg.Args = append(ff.ffmpeg.Args, "-ac", strconv.FormatUint(uint64(channels), 10), "-f", "flac", filenameFlac)
+	ff.ffmpeg.Args = append(ff.ffmpeg.Args, "-ac", strconv.FormatUint(uint64(channels), 10), "-f", "flac", "pipe:1")
 	if ff.pipe, err = ff.ffmpeg.StdinPipe(); err != nil {
 		return nil, "", err
 	}
diff --git a/rhimport/fetcher.go b/rhimport/fetcher.go
index 74cd1fa..469d36b 100644
--- a/rhimport/fetcher.go
+++ b/rhimport/fetcher.go
@@ -81,7 +81,7 @@ func curlWriteCallback(ptr []byte, userdata interface{}) bool {
 			data.filename = filepath.Join(data.basepath, name)
 		}
 		data.ctx.OrigFilename = data.filename
-		conv, newFilename, err := NewFetchConverter(data.ctx.FetchConverter, data.filename, data.metadata)
+		conv, newFilename, err := NewFetchConverter(data.ctx.FetchConverter, data.filename, data.metadata, data.ctx.Channels)
 		if err != nil {
 			rhl.Printf("Unable to create converter for file %s: %s", data.filename, err)
 			data.writeError = err
@@ -359,7 +359,7 @@ func fetchFileDirConvert(ctx *Context, res *Result, origSrc *os.File, sizeTotal
 
 	ctx.OrigFilename = ctx.SourceFile
 	var conv FetchConverter
-	if conv, ctx.SourceFile, err = NewFetchConverter(ctx.FetchConverter, filepath.Join(basepath, origFile), nil); err != nil {
+	if conv, ctx.SourceFile, err = NewFetchConverter(ctx.FetchConverter, filepath.Join(basepath, origFile), nil, ctx.Channels); err != nil {
 		rhl.Printf("Unable to create converter for file %s: %s", origDir+origFile, err)
 		return
 	}
@@ -598,7 +598,7 @@ func fetchFileAttachment(ctx *Context, res *Result, uri *url.URL) error {
 
 	var conv FetchConverter
 	ctx.OrigFilename = ctx.SourceFile
-	if conv, ctx.SourceFile, err = NewFetchConverter(ctx.FetchConverter, ctx.SourceFile, nil); err != nil {
+	if conv, ctx.SourceFile, err = NewFetchConverter(ctx.FetchConverter, ctx.SourceFile, nil, ctx.Channels); err != nil {
 		rhl.Printf("Unable to create converter for file %s: %s", ctx.OrigFilename, err)
 		return err
 	}
-- 
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