Re: [Bluez-devel] Frequent headset disconnects

[John Feig <feig@nnytech.net>]

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Brad Midgley wrote:
> *John
>
> *
>
>
>     I've been using the a2dpd app for a couple of weeks now, and
>     really like
>     it. I have a few issues though, with the main one being that after a
>     couple of minutes of playback, my headphones (HT820) turn off
>
>
> it looks like alsa_transfer_raw returns -1 once and then a2dpd closes 
> the connection. Maybe we should be checking for an error state that 
> indicates we can retry or maybe we should retry a few times regardless.
>
> it could be the set turns off because of the way we terminate the 
> connection. This is mostly Frederic's playground but I remember 
> locking up headsets with a2play by accidentally sending data on the 
> stream fd after we had signaled a stream close on the control fd.
>
> brad
Brad, thank you for the reply. To try to understand this, you're saying 
that when I get:

a2dp_transfer_raw: Wrote -1 not 603 bytes (sbc.len=118)
transfer_outgoing_packets: Error in transfer (transfer=-1)

The issue could be that the headset is expecting a value of a certain 
length, and since the value -1 is not that length, the headset doens't 
like that, and shuts down? If this is the case, where should I look to 
change that value, and what should it be changed to? I wouldn't mind 
sending some dummy data and have it drop out for a second once in a 
while, as long as I don't have to keep restarting the thing. At least it 
would be a temporary fix.

I found the IF block in a2dpd_output_a2dp.c:

if (a2dp->sk > 0) {
    // Pause?
    // The value 0 have finally been tested ;)
    // However, we may safely simulate a failed write
    if (!a2dp->pause_writing) {
        // Send our data
            if ((written = write(a2dp->sk, a2dp->buf, a2dp->len)) != 
a2dp->len) {
                // Error while sending data
                    DBG("Wrote %d not %d bytes (sbc.len=%d)", written, 
a2dp->len, a2dp->sbc.len);
                        // Return the error
                        result = written;
            }
...

That seems to be the only place that contains that string, that I could 
find. I can't find out where the function "write" is defined either.

I'll keep looking, and if you guys can give me some suggestions of 
things to try and what I should be looking at, I will and let you all 
know how it goes.

Thanks again,
John

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