Library for decoding and encoding chunked audio containers like RIFF / AIFF.
- Supported formats:
- Waveform Audio File Format (WAVE)
- Broadcast Wave Format (BWF)
- Audio Interchange File Format (AIFF, AIFF-C)
- Supported chunks (Decode / Encode)
- 'fmt ' - WAVE format and PCM format
- 'COMM' - Common
- 'bext' - Broadcast Extension for sound metadata in BWF (version 0, 1, 2)
- 'iXML' - Extension for sound metadata in BWF (iXML Specification Revision 2.10)
- Decode headers of unknown chunks
- Encode custom header
- Byte array presentation of known chunks for further processing
Download and install chunk into your GOPATH.
go get github.com/metawav/chunk
Import the package to get started.
import "github.com/metawav/chunk"fileName := "sample.wav"
file, err := os.Open(fileName)
if err != nil {
panic(err)
}
defer file.Close()
reader := io.ReadSeeker(file)
container, _ := chunk.ReadRiff(file.Name(), reader)
for _, header := range container.Headers {
fmt.Printf("%s\n", header)
}Example output:
ID: fmt Size: 16 FullSize: 24 StartPos: 12 HasPadding: false
ID: data Size: 88200 FullSize: 88208 StartPos: 36 HasPadding: false
ID: LIST Size: 68 FullSize: 76 StartPos: 88244 HasPadding: false
ID: JUNK Size: 10 FullSize: 18 StartPos: 88320 HasPadding: false
headers := container.FindHeaders("fmt ") // keep care of trailing space :)
chunkBytes := make([]byte, headers[0].FullSize())
_, err = file.ReadAt(chunkBytes, int64(headers[0].StartPos()))
if err != nil {
//handle err
}
format, err := chunk.DecodePCMFormatChunk(chunkBytes)
if err != nil {
//handle err
}
fmt.Printf("%s\n", format)Example output:
Format: 1
Channels: 1
Sample rate: 44100
Byte rate: 88200
Bytes per sample: 2
Bits per sample: 16
format = chunk.EncodePCMFormatChunk(16, 1, 1, 44100, 88200, 2, 24)
fmt.Printf("%s\n", format)Example output:
Format: 1
Channels: 1
Sample rate: 44100
Byte rate: 88200
Bytes per sample: 2
Bits per sample: 24
format = chunk.EncodePCMFormatChunk(16, 1, 1, 44100, 88200, 2, 24)
fmt.Printf("%08b\n", format.Bytes())Example output:
[
01100110 01101101 01110100 00100000 // ID = "fmt "
00010000 00000000 00000000 00000000 // size = 16
00000001 00000000 // format = 1
00000001 00000000 // channels = 1
01000100 10101100 00000000 00000000 // samples per sec = 44100
10001000 01011000 00000001 00000000 // bytes per sec = 88200
00000010 00000000 // block align = 2
00011000 00000000 // bits per sample = 24
]
See package documentation:
chunk is released under Apache License, Version 2.0. See LICENSE.
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