James Courtier-Dutton wrote:
Jaroslav Kysela wrote:
On Fri, 13 Jun 2008, Takashi Iwai wrote:
- Add some new API functions,
I would prefer to extend the current API than to change meaning of hw_ptr to handle extra latencies.
I would prefer the definition of snd_pcm_delay() to be: Before the next sample is written to the buffer, snd_pcm_delay() returns the expect time delay, in frames, indicating the time the next sample will reach the speakers. This is what snd_pcm_delay() was introduced into the ALSA api for. I remember, because it was added as a result of me requesting it.
Then implement a totally different api call to help with under run timings.
Big +1
You also have to think of the use cases currently out there.
* World + Dog uses it as James (and Lennart) states. * Wine uses it sans latency.
So lots of apps having to change to cope verses one (known) app changing. I think even the wine folk would agree this is more sensible!
Also by changing the definition, would you not have to change the usb-audio driver works? In general I'd say it's a whole lot less work to leave snd_pcm_delay() as it is, update the docs and add a new api function for under run stuff.
Col