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//
// rhimportd
//
// The Radio Helsinki Rivendell Import Daemon
//
//
// Copyright (C) 2015-2016 Christian Pointner <equinox@helsinki.at>
//
// This file is part of rhimportd.
//
// rhimportd is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// any later version.
//
// rhimportd is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with rhimportd. If not, see <http://www.gnu.org/licenses/>.
//
package rhimport
import (
"fmt"
"io"
"net/http"
"os"
"os/exec"
"path/filepath"
"strings"
)
type ffmpegResult struct {
output string
err error
}
func runNormalizer(ctx *Context, res *Result, src *os.File, size int64) (err error) {
ctx.reportProgress(2, "normalizing", 0.0, float64(size))
basepath, filename := filepath.Split(src.Name())
ext := filepath.Ext(filename)
destName := strings.TrimSuffix(filename, ext) + "_normalized.flac"
ctx.stdlog.Printf("NormalizeFile: '%s' -> '%s', using gain = %.2f dB", filename, destName, ctx.LoudnessCorr)
ctx.SourceFile = basepath + destName
ffmpeg := exec.Command("ffmpeg", "-loglevel", "warning", "-i", "-", "-filter:a", fmt.Sprintf("volume=%fdB", ctx.LoudnessCorr), "-map_metadata", "0", "-f", "flac", ctx.SourceFile)
var ffstdin io.WriteCloser
if ffstdin, err = ffmpeg.StdinPipe(); err != nil {
return
}
ffresult := make(chan ffmpegResult)
go func() {
output, err := ffmpeg.CombinedOutput()
ffresult <- ffmpegResult{strings.TrimSpace(string(output)), err}
}()
var written int64
for {
if ctx.isCanceled() {
ffmpeg.Process.Kill()
res.ResponseCode = http.StatusNoContent
res.ErrorString = "canceled"
return nil
}
var w int64
w, err = io.CopyN(ffstdin, src, 512*1024)
if err != nil {
break
}
written += w
ctx.reportProgress(2, "normalizing", float64(written), float64(size))
}
ffstdin.Close()
r := <-ffresult
if r.err != nil {
return fmt.Errorf("normalizer exited with error: %q, ffmpeg output: %s", r.err, r.output)
}
if err != nil && err != io.EOF {
return
}
ctx.reportProgress(2, "normalizing", float64(size), float64(size))
return nil
}
func NormalizeFile(ctx *Context) (res *Result, err error) {
res = &Result{ResponseCode: http.StatusOK}
if ctx.LoudnessCorr == 0.0 {
ctx.stdlog.Println("NormalizeFile: skipping normalization since the gain = 0.0dB")
ctx.reportProgress(2, "normalizing", 1.0, 1.0)
return
}
var src *os.File
if src, err = os.Open(ctx.SourceFile); err != nil {
return
}
defer src.Close()
size := int64(0)
if info, err := src.Stat(); err != nil {
return res, err
} else {
size = info.Size()
}
if err = runNormalizer(ctx, res, src, size); err != nil {
ctx.stdlog.Println("NormalizeFile error:", err)
return
}
return
}
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