Alexander
55 lines
1.0 KiB
Go
55 lines
1.0 KiB
Go
package audio
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import (
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"fmt"
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"os"
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"time"
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"github.com/tcolgate/mp3"
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)
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func analyzeMP3(filePath string) (*TrackInfo, error) {
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f, err := os.Open(filePath)
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if err != nil {
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return nil, fmt.Errorf("opening MP3: %w", err)
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}
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defer f.Close()
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decoder := mp3.NewDecoder(f)
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var frame mp3.Frame
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var skipped int
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var totalDuration time.Duration
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var sampleRate, channels, bitrate int
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var frameCount int
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for {
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err := decoder.Decode(&frame, &skipped)
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if err != nil {
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break
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}
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if frameCount == 0 {
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sampleRate = int(frame.Header().SampleRate())
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channels = channelCount(frame.Header().ChannelMode())
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bitrate = int(frame.Header().BitRate()) / 1000
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}
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totalDuration += frame.Duration()
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frameCount++
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}
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return &TrackInfo{
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Format: "MP3",
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SampleRate: sampleRate,
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Channels: channels,
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DurationMs: int(totalDuration.Milliseconds()),
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BitrateKbps: bitrate,
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IsLossless: false,
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}, nil
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}
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func channelCount(mode mp3.FrameChannelMode) int {
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if mode == mp3.SingleChannel {
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return 1
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}
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return 2
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}
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