126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
package ffmpeg
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import (
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"bytes"
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"context"
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"fmt"
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"io"
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"os"
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"os/exec"
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"strings"
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"unlock-music.dev/cli/algo/common"
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"unlock-music.dev/cli/internal/utils"
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)
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func ExtractAlbumArt(ctx context.Context, rd io.Reader) (*bytes.Buffer, error) {
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cmd := exec.CommandContext(ctx, "ffmpeg",
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"-i", "pipe:0", // input from stdin
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"-an", // disable audio
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"-codec:v", "copy", // copy video(image) codec
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"-f", "image2", // use image2 muxer
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"pipe:1", // output to stdout
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)
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cmd.Stdin = rd
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stdout, stderr := &bytes.Buffer{}, &bytes.Buffer{}
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cmd.Stdout, cmd.Stderr = stdout, stderr
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if err := cmd.Run(); err != nil {
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return nil, fmt.Errorf("ffmpeg run: %w", err)
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}
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return stdout, nil
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}
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type UpdateMetadataParams struct {
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Audio string // required
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AudioExt string // required
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Meta common.AudioMeta // required
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AlbumArt []byte // optional
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AlbumArtExt string // required if AlbumArt is not nil
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}
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func UpdateMeta(ctx context.Context, outPath string, params *UpdateMetadataParams) error {
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if params.AudioExt == ".flac" {
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return updateMetaFlac(ctx, outPath, params)
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} else {
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return updateMetaFFmpeg(ctx, outPath, params)
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}
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}
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func updateMetaFFmpeg(ctx context.Context, outPath string, params *UpdateMetadataParams) error {
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builder := newFFmpegBuilder()
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out := newOutputBuilder(outPath) // output to file
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builder.SetFlag("y") // overwrite output file
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builder.AddOutput(out)
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// input audio -> output audio
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builder.AddInput(newInputBuilder(params.Audio)) // input 0: audio
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out.AddOption("map", "0:a")
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out.AddOption("codec:a", "copy")
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// input cover -> output cover
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if params.AlbumArt != nil &&
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params.AudioExt != ".wav" /* wav doesn't support attached image */ {
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// write cover to temp file
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artPath, err := utils.WriteTempFile(bytes.NewReader(params.AlbumArt), params.AlbumArtExt)
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if err != nil {
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return fmt.Errorf("updateAudioMeta write temp file: %w", err)
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}
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defer os.Remove(artPath)
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builder.AddInput(newInputBuilder(artPath)) // input 1: cover
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out.AddOption("map", "1:v")
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switch params.AudioExt {
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case ".ogg": // ogg only supports theora codec
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out.AddOption("codec:v", "libtheora")
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case ".m4a": // .m4a(mp4) requires set codec, disposition, stream metadata
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out.AddOption("codec:v", "mjpeg")
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out.AddOption("disposition:v", "attached_pic")
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out.AddMetadata("s:v", "title", "Album cover")
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out.AddMetadata("s:v", "comment", "Cover (front)")
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case ".mp3":
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out.AddOption("codec:v", "mjpeg")
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out.AddMetadata("s:v", "title", "Album cover")
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out.AddMetadata("s:v", "comment", "Cover (front)")
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default: // other formats use default behavior
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}
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}
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// set file metadata
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album := params.Meta.GetAlbum()
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if album != "" {
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out.AddMetadata("", "album", album)
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}
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title := params.Meta.GetTitle()
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if album != "" {
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out.AddMetadata("", "title", title)
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}
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artists := params.Meta.GetArtists()
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if len(artists) != 0 {
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// TODO: it seems that ffmpeg doesn't support multiple artists
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out.AddMetadata("", "artist", strings.Join(artists, " / "))
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}
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if params.AudioExt == ".mp3" {
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out.AddOption("write_id3v1", "true")
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out.AddOption("id3v2_version", "3")
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}
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// execute ffmpeg
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cmd := builder.Command(ctx)
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if stdout, err := cmd.CombinedOutput(); err != nil {
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return fmt.Errorf("ffmpeg run: %w, %s", err, string(stdout))
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}
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return nil
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}
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