Start a playback from a specific point in millisecond ?

[Duddy67]

Hi all,
Is there a way to start a playback from a specific point in millisecond ?
The only function I found so far to do this is:
ma_sound_seek_to_pcm_frame(&sound, someValue);
but the required value is in pcm frames.

Thank you for enlightening me on this subject.

[mackron]

You can derive the position in frames using the sound's sample rate. Use ma_engine_get_sample_rate() to get the rate:

seekPointInFrames = (seekPointInMilliseconds * ma_engine_get_sample_rate(&engine)) / 1000;

The sample rate is in seconds, hence the division by 1000.

[Duddy67]

Thanks for your fast reply.
Actually I'd need to go the other way around (to turn the frames into milliseconds).
I would also need to get the total time of a file in milliseconds.

[cdigit]

Regarding, frames to milliseconds: you can divide the frames by the sample rate to get the frames per second, then divide that by 1000 to get milliseconds.

For the total time of a file, one idea could be to read the file in_pcm_frames while counting the number of frames read.

[mackron]

You can just rearrange it:

seekPointInMilliseconds = seekpointInFrames * 1000 / ma_engine_get_sample_rate(&engine)

Make sure you multiply the seek point by 1000 first if you're doing everything using integer math.