Should bwfxml metadata appear when getting metadata?

[ChristopherBiscardi]

Hiya. I have a .wav file that came from a zoom f3 recorder with timecode and I'm not finding some data I expect to see when processing the audio.

I am unable to see the timecode in the symphonia produced metadata (I can see other metadata).

I haven't gotten too deep into investigating the metadata parsing in symphonia, but I've confirmed that there is a BWFXML section at the head of the file.

Is this something symphonia should be able to parse and display in metadata? In this case I can see the number I need in TIMESTAMP_SAMPLES_SINCE_MIDNIGHT_LO.

RIFF��,WAVEbextZzSPEED=25.000ND
zTAKE=001
zUBITS=00000000
zSCENE=230308
zTAPE=
zCIRCLED=FALSE
zTRK4=Tr2
zNOTE=
ZOOM F32023-03-0817:11:08�>�A=PCM,F=48000,W=32,M=mono,T=F3;VERSION=1.10;P=230308_001_Tr1;iXMLj<?xml version="1.0" encoding="UTF-8"?>
<BWFXML>
	<IXML_VERSION>1.62</IXML_VERSION>
	<PROJECT></PROJECT>
	<SCENE>230308</SCENE>
	<TAKE>001</TAKE>
	<TAPE></TAPE>
	<CIRCLED>FALSE</CIRCLED>
	<FILE_UID>ZOOM F3    202303081711080080002</FILE_UID>
	<UBITS>00000000</UBITS>
	<NOTE></NOTE>
	<SPEED>
		<NOTE></NOTE>
		<MASTER_SPEED>25/1</MASTER_SPEED>
		<CURRENT_SPEED>25/1</CURRENT_SPEED>
		<TIMECODE_RATE>25/1</TIMECODE_RATE>
		<TIMECODE_FLAG>NDF</TIMECODE_FLAG>
		<FILE_SAMPLE_RATE>48000</FILE_SAMPLE_RATE>
		<AUDIO_BIT_DEPTH>32</AUDIO_BIT_DEPTH>
		<DIGITIZER_SAMPLE_RATE>48000</DIGITIZER_SAMPLE_RATE>
		<TIMESTAMP_SAMPLES_SINCE_MIDNIGHT_HI>0000000000</TIMESTAMP_SAMPLES_SINCE_MIDNIGHT_HI>
		<TIMESTAMP_SAMPLES_SINCE_MIDNIGHT_LO>0032784000</TIMESTAMP_SAMPLES_SINCE_MIDNIGHT_LO>
		<TIMESTAMP_SAMPLE_RATE>48000</TIMESTAMP_SAMPLE_RATE>
	</SPEED>
	<HISTORY>
		<ORIGINAL_FILENAME>230308_001_Tr2.WAV</ORIGINAL_FILENAME>
	</HISTORY>
	<FILE_SET>
		<TOTAL_FILES>1</TOTAL_FILES>
		<FAMILY_UID>ZOOM F3    202303081711080080000</FAMILY_UID>
		<FILE_SET_INDEX>1</FILE_SET_INDEX>
	</FILE_SET>
	<TRACK_LIST>
		<TRACK_COUNT>1</TRACK_COUNT>
		<TRACK>
			<CHANNEL_INDEX>4</CHANNEL_INDEX>
			<INTERLEAVE_INDEX>1</INTERLEAVE_INDEX>
			<NAME></NAME>
		</TRACK>
	</TRACK_LIST>
</BWFXML>

ffprobe *does* find this data, with the relevant data I'm looking for in `tags.time_reference`

❯ ffprobe -i /Users/chris/230308_001_Tr2.WAV -v quiet -print_format json -show_format -show_streams
{
    "streams": [
        {
            "index": 0,
            "codec_name": "pcm_f32le",
            "codec_long_name": "PCM 32-bit floating point little-endian",
            "codec_type": "audio",
            "codec_tag_string": "[3][0][0][0]",
            "codec_tag": "0x0003",
            "sample_fmt": "flt",
            "sample_rate": "48000",
            "channels": 1,
            "bits_per_sample": 32,
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/48000",
            "duration_ts": 4800000,
            "duration": "100.000000",
            "bit_rate": "1536000",
            "disposition": {
                "default": 0,
                "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 0,
                "timed_thumbnails": 0,
                "captions": 0,
                "descriptions": 0,
                "metadata": 0,
                "dependent": 0,
                "still_image": 0
            }
        }
    ],
    "format": {
        "filename": "/Users/chris/2023-03-08-timecode-recording/230308_001_Tr2.WAV",
        "nb_streams": 1,
        "nb_programs": 0,
        "format_name": "wav",
        "format_long_name": "WAV / WAVE (Waveform Audio)",
        "duration": "100.000000",
        "size": "19724288",
        "bit_rate": "1577943",
        "probe_score": 99,
        "tags": {
            "comment": "zSPEED=25.000ND\r\nzTAKE=001\r\nzUBITS=00000000\r\nzSCENE=230308\r\nzTAPE=\r\nzCIRCLED=FALSE\r\nzTRK4=Tr2\r\nzNOTE=\r\n",
            "encoded_by": "ZOOM F3",
            "date": "2023-03-08",
            "creation_time": "17:11:08",
            "time_reference": "32784000",
            "coding_history": "A=PCM,F=48000,W=32,M=mono,T=F3;VERSION=1.10;P="
        }
    }
}

All I can see is the track information and empty metadata revisions

[src/main.rs:53] v = Track {
    id: 0,
    codec_params: CodecParameters {
        codec: CodecType(
            284,
        ),
        sample_rate: Some(
            48000,
        ),
        time_base: Some(
            TimeBase {
                numer: 1,
                denom: 48000,
            },
        ),
        n_frames: Some(
            4800000,
        ),
        start_ts: 0,
        sample_format: None,
        bits_per_sample: None,
        bits_per_coded_sample: None,
        channels: Some(
            FRONT_LEFT,
        ),
        channel_layout: None,
        delay: None,
        padding: None,
        max_frames_per_packet: Some(
            1152,
        ),
        packet_data_integrity: false,
        verification_check: None,
        frames_per_block: Some(
            1,
        ),
        extra_data: None,
    },
    language: None,
}
[src/main.rs:94] format.metadata() = Metadata {
    revisions: [],
}

[ChristopherBiscardi]

I later found some debug logs and confirmed that the relevant chunks don't currently get parsed.

The latter (iXML/bwfxml) would require an xml parser to be added as far as I can tell.

symphonia_format_wav::chunks: ignoring unknown chunk: tag=bext, len=1114.
symphonia_format_wav::chunks: ignoring unknown chunk: tag=iXML, len=5226.