Support for IAMF boxes and dumping headers

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Support for Iamf and iacb boxes
+
 ## [0.51.0] - 2026-02-20
 
 ### Added

README.md

@@ -54,6 +54,7 @@ codec-specific boxes. The codecs and their boxes are
 | Audio | E-AC-3 | ec-3 | dec3 | btrt |
 | Audio | AC-4 | ac-4 | dac4 | btrt |
 | Audio | Opus | Opus | dOps | btrt |
+| Audio | IAMF | iamf | iacb | btrt |
 | Audio | MPEG-H 3D Audio | mha1, mha2, mhm1, mhm2 | mhaC | btrt |
 | Audio | Encrypted | enca | sinf | btrt |
 | Subtitles | WebVTT | wvtt | vttC, vlab | vttc, vtte, vtta, vsid, ctim, iden, sttg, payl, btrt |

iamf/iamf.go

@@ -0,0 +1,64 @@
+package iamf
+
+import (
+	"errors"
+
+	"github.com/Eyevinn/mp4ff/bits"
+)
+
+var (
+	ErrInvalidLeb = errors.New("Invalid Leb128")
+)
+
+// ReadLeb128 reads an unsigned Leb128 (Little Endian Base 128) encoded integer
+func ReadLeb128(sr bits.SliceReader) (uint64, error) {
+	var result uint64
+	var shift uint
+	for {
+		if shift > 63 {
+			return 0, ErrInvalidLeb
+		}
+		b := sr.ReadUint8()
+		if sr.AccError() != nil {
+			return 0, sr.AccError()
+		}
+		result |= uint64(b&0x7f) << shift
+		if (b & 0x80) == 0 {
+			break
+		}
+		shift += 7
+	}
+	return result, nil
+}
+
+// WriteLeb128 writes an unsigned Leb128 (Little Endian Base 128) encoded integer
+func WriteLeb128(sw bits.SliceWriter, value uint64) {
+	for {
+		b := byte(value & 0x7f)
+		value >>= 7
+		if value != 0 {
+			b |= 0x80
+		}
+		sw.WriteUint8(b)
+		if value == 0 {
+			break
+		}
+	}
+}
+
+// Leb128Size calculates the size in bytes of a Leb128 (Little Endian Base 128) encoded integer
+func Leb128Size(value uint64) int {
+	if value == 0 {
+		return 1
+	}
+	size := 0
+	for value > 0 {
+		size++
+		value >>= 7
+	}
+	return size
+}
+
+func GetCodecString(descriptorData []byte) (string, error) {
+	return "", nil
+}