How to get stream duration (n_frames = None)?

[zchira]

Hi,
I am trying to make player for podcasts.
I created my UrlSource struct which implements Send, Sync, MediaSource, Read, Seek.
When I use it it works fine (I am able to open remote stream, play it, seek to some random time, etc...).

But I am not able to get the duration. get_probe() returns track with n_frames = None:

track: Track {
    id: 0,
    codec_params: CodecParameters {
        codec: CodecType(
            4099,
        ),
        sample_rate: Some(
            22050,
        ),
        time_base: Some(
            TimeBase {
                numer: 1,
                denom: 22050,
            },
        ),
        n_frames: None,
        start_ts: 0,
        sample_format: None,
        bits_per_sample: None,
        bits_per_coded_sample: None,
        channels: Some(
            FRONT_LEFT | FRONT_RIGHT,
        ),
        channel_layout: None,
        delay: None,
        padding: None,
        max_frames_per_packet: None,
        packet_data_integrity: false,
        verification_check: None,
        frames_per_block: None,
        extra_data: None,
    },
    language: None,
}

any advice? What to try?

As a starting point for my implementation I used the example from symphonia-play
https://github.com/pdeljanov/Symphonia/tree/master/symphonia-play

[zchira]

Fixed :)

The problem was in my MeadiaSource trait implementation .
Function:

    fn byte_len(&self) -> Option<u64>

in my implementation was hardcoded to return None instead of real size.