Re: [Bluez-devel] a2dpd and mplayer - any chance to get it working?

[Brad Midgley <bmidgley@xmission.com>]

Robert

Frederic is the one who is writing this. He has had some trouble getting
xmms to play without the sleep() call and it may be related to the pcm
status.

Frederic may have been changing things, but at least in what's there I
don't see any status reporting.

Brad

> On Wednesday 17 January 2007 08:03, Frederic Dalleau wrote:
>>  I was wondering about alsa plugins :
>> xmms relies on alsa timing to play, so in the plugin, there is a sleep()
>> call, this will wait a little bit until it is time to retievre new data.
>> But it seems some players (like mplayer) wants to do their own timing or at
>> least don't want to sleep. They need to use that time to do some decoding
>> instead. If you sleep too long, the decoding will be defered and the sound
>> or movie will be broken.
>>
>> Is there a rule to distinguish? Or some magic value to sleep?
> 
> I had a look at MPlayer to see what it's doing. It sleeps whenever needed, and 
> it finds out how long to sleep by looking at the PCM status. I posted the 
> following message to alsa-devel, but unfortunately so far nobody answered. 
> Maybe someone on this list knows an answer.
> 
> Robert
> 
> ----------  Forwarded Message  ----------
> 
> Subject: snd_pcm_status_get_avail() and external I/O plugins
> Date: Thursday 18 January 2007 14:51
> From: Robert Huitl <alsa-devel@huitl.de>
> To: alsa-devel@lists.sourceforge.net
> 
> Hello,
> 
> I have some trouble to get mplayer working with an external pcm I/O plugin
> (a2dp from bluez). The problem is that mplayer needs to know how much space
> is left in the ring buffer:
> 
>   snd_pcm_status(alsa_handler, status)
>   ret = snd_pcm_status_get_avail(status) * bytes_per_sample;
> 
> Now with the ALSA kernel driver, ret will vary, depending on how much data
>  was written to the device, and how much time passed.
> 
> However, with the I/O plugin, snd_pcm_status_get_avail() always returns the
> maximum value (causing mplayer to think that all samples have been played). I
> can't find a callback function for the status in snd_pcm_ioplug_callback_t
> where I could adjust the avail value.
> 
> I'd appreciate any hints.
> 
> Robert
> 
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