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// Copyright (c) 2022 Sumner Evans
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package ffmpeg
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strings"
log "maunium.net/go/maulogger/v2"
"maunium.net/go/mautrix/util"
)
var ffmpegDefaultParams = []string{"-hide_banner", "-loglevel", "warning"}
// Convert a media file on the disk using ffmpeg.
//
// Args:
// * inputFile: The full path to the file.
// * outputExtension: The extension that the output file should be.
// * inputArgs: Arguments to tell ffmpeg how to parse the input file.
// * outputArgs: Arguments to tell ffmpeg how to convert the file to reach the wanted output.
// * removeInput: Whether the input file should be removed after converting.
//
// Returns: the path to the converted file.
func ConvertPath(inputFile string, outputExtension string, inputArgs []string, outputArgs []string, removeInput bool) (string, error) {
outputFilename := strings.TrimSuffix(inputFile, filepath.Ext(inputFile)) + outputExtension
args := []string{}
args = append(args, ffmpegDefaultParams...)
args = append(args, inputArgs...)
args = append(args, "-i", inputFile)
args = append(args, outputArgs...)
args = append(args, outputFilename)
cmd := exec.Command("ffmpeg", args...)
vcLog := log.Sub("ffmpeg").Writer(log.LevelWarn)
cmd.Stdout = vcLog
cmd.Stderr = vcLog
err := cmd.Run()
if err != nil {
return "", fmt.Errorf("ffmpeg error: %+v", err)
}
if removeInput {
os.Remove(inputFile)
}
return outputFilename, nil
}
// Convert media data using ffmpeg.
//
// Args:
// * data: The media data to convert
// * outputExtension: The extension that the output file should be.
// * inputArgs: Arguments to tell ffmpeg how to parse the input file.
// * outputArgs: Arguments to tell ffmpeg how to convert the file to reach the wanted output.
// * inputMime: The mimetype of the input data.
//
// Returns: the converted data
func ConvertBytes(data []byte, outputExtension string, inputArgs []string, outputArgs []string, inputMime string) ([]byte, error) {
tempdir, err := ioutil.TempDir("", "mautrix_ffmpeg_*")
if err != nil {
return nil, err
}
defer os.RemoveAll(tempdir)
inputFileName := fmt.Sprintf("%s/input%s", tempdir, util.ExtensionFromMimetype(inputMime))
inputFile, err := os.OpenFile(inputFileName, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0600)
if err != nil {
return nil, fmt.Errorf("failed to open input file: %w", err)
}
_, err = inputFile.Write(data)
if err != nil {
inputFile.Close()
return nil, fmt.Errorf("failed to write data to input file: %w", err)
}
inputFile.Close()
outputPath, err := ConvertPath(inputFileName, outputExtension, inputArgs, outputArgs, false)
if err != nil {
return nil, err
}
return ioutil.ReadFile(outputPath)
}
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