How to get the length of an ogg sound with libvorbis/libogg and dynamic decoding/streaming?

[ns-studios]

Greetings,

I am sorry if this was already asked before (I looked but didn't find), but it seems as though trying to get the length for an ogg sound loaded with ma_sound_init_from_file with ma_sound_get_length_in_pcm_frames returns success, but outputs 0 when using the dynamic decoding mode and errors when using the streaming one.
Wave and flac files don't seem to exhibit this behavior.
Is there any way to get the length of ogg files even when not using the pre-decode mode?
Thanks.
Modified custom decoder engine example

[mackron]

The libvorbis decoding backend does not have reliable retrieval of the length of a file. You can try modifying ma_libvorbis_get_length_in_pcm_frames() in extras/miniaudio_libvorbis.h to call ov_pcm_total, but in my experience it gave inaccurate results.

Regarding the error when using streaming, do you mean ma_sound_get_length_in_pcm_frames() is returning an error?

[ns-studios]

Thank you so much for responding and your suggestions.
Ov_pcm_total seems to work perfectly for the files I've tried it with so far, but I'll keep your warning about it being inaccurate in mind and will do more testing.
About streaming, yes. At least here, if I specify MA_SOUND_FLAG_STREAMING to ma_sound_init_from_file with an ogg file, and try to get the length, result=ma_sound_get_length_in_pcm_frames(...); returns -29, which is MA_NOT_IMPLEMENTED I believe.
Modifying ma_libvorbis_get_length_in_pcm_frames to get length from ov_pcm_total and assign it to *pLength works for streaming, too, i.e., it gets rid of the error in case that is useful.
Can I count on ma_sound_get_length_in_pcm_frames to return the accurate length when using MA_SOUND_FLAG_DECODE flag with ma_sound_init_from_file even if ma_libvorbis_get_length_in_pcm_frames now returns the length itself?