Exemple #1
0
func (editor *Mp3TagEditor) getUnsupportedID3v2Tags(existingTagData []byte) []byte {
	result := make([]byte, len(existingTagData))
	size := 0

	for len(existingTagData) > id3v2FrameHeaderSize {
		frameId := string(existingTagData[0:4])
		frameSize := utils.ReadInt32Be(existingTagData[4:8])

		stop := false
		switch frameId {
		case "\x00\x00\x00\x00":
			stop = true
		case "APIC", "COMM", "TALB", "TCON", "TIT2", "TPE1", "TRCK", "TYER", "TDRC":
			break
		default:
			copy(result[size:size+id3v2FrameHeaderSize+frameSize], existingTagData[:id3v2FrameHeaderSize+frameSize])
			size += id3v2FrameHeaderSize + frameSize
		}

		if stop {
			break
		}

		existingTagData = existingTagData[id3v2FrameHeaderSize+frameSize:]
	}

	return result[:size]
}
Exemple #2
0
func (editor *Mp3TagEditor) findIDv2Data(version byte, data []byte) []byte {
	if len(data) < id3v2HeaderSize {
		return nil
	}
	if string(data[0:3]) != id3v2TagMagic {
		return nil
	}

	size := editor.readSyncInt32Be(data[6:10])
	if len(data) < id3v2HeaderSize+size || size == 0 {
		return nil
	}

	// wrong version, continue search
	if data[3] != version || data[4] != 0 {
		return editor.findIDv2Data(version, data[(id3v2HeaderSize+size):])
	}

	// exclude extended header if any
	extendedHeaderSize := 0
	if data[5]&0x40 != 0 {
		switch version {
		case 3:
			extendedHeaderSize = utils.ReadInt32Be(data[11:15]) + 4
		case 4:
			extendedHeaderSize = editor.readSyncInt32Be(data[11:15])
		}
	}

	return data[(id3v2HeaderSize + extendedHeaderSize):(id3v2HeaderSize + extendedHeaderSize + size)]
}
Exemple #3
0
func (editor *Mp3TagEditor) parseID3v2Tag(data []byte, version int) Tag {
	if len(data) == 0 {
		return Tag{}
	}

	var tag Tag
	for len(data) > id3v2FrameHeaderSize {
		frameId := string(data[0:4])
		if frameId == "\x00\x00\x00\x00" {
			break
		}

		frameSize := 0
		switch version {
		case 3:
			frameSize = utils.ReadInt32Be(data[4:8])
		case 4:
			frameSize = editor.readSyncInt32Be(data[4:8])
		}

		editor.parseID3v2Frame(&tag, frameId, data[id3v2FrameHeaderSize:(id3v2FrameHeaderSize+frameSize)])
		data = data[id3v2FrameHeaderSize+frameSize:]
	}

	return tag
}
Exemple #4
0
func parseVorbisTagPictureField(data []byte, cover *Cover) error {
	if len(data) < 4 {
		return errors.New("vorbis picture data is too short to contain a picture")
	}

	cover.Type = imageType[byte(utils.ReadInt32Be(data[0:4]))]

	mimeTypeSize := utils.ReadInt32Be(data[4:8])
	if len(data) < 8+mimeTypeSize+4 {
		return errors.New("vorbis picture data is incomplete")
	}
	cover.Mime = string(data[8 : 8+mimeTypeSize])

	descriptionSize := utils.ReadInt32Be(data[8+mimeTypeSize : 8+mimeTypeSize+4])
	if len(data) < 8+mimeTypeSize+4+descriptionSize+20 {
		return errors.New("vorbis picture data is incomplete")
	}
	cover.Description = string(data[8+mimeTypeSize+4 : 8+mimeTypeSize+4+descriptionSize])

	cover.Data = make([]byte, len(data)-(8+mimeTypeSize+4+descriptionSize+20))
	copy(cover.Data, data[8+mimeTypeSize+4+descriptionSize+20:])

	return nil
}