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Lennart Poettering <lennart@poettering.net> wrote:
> On Wed, 15.04.09 16:26, Erich Boleyn (erich@uruk.org) wrote:
>
> > Just noticed the new 0.9.15 release, got it building on Gentoo, and then
> > found that the non-dbus build's ALSA modules appear to be broken:
...
> > Is this something that can stubbed out (relatively) safely?
>
> Hmm, yes. As it seems I broke the build for non-dbus builds. Should be
> easy to fix. Best way is probably to make the reserver wrapper mostly
> a noop if D-Bus is not available.
>
> Please understand that I don't really focus on making every weird
> combination of build deps work. So I won't fix this for you. But I am
> happy to merge good patches!
No problem, I was mainly looking for a hint that to your knowledge there
should be no wierd side-effects from stubbing out the reserve and dbus
functions inside reserve_wrapper. Thanks for said hint. ;-)
Attached is a patch to include "reserve_wrapper.[ch]" in the non-dbus
builds, and do said stubbing when HAVE_DBUS is not defined. It has
passed moderate testing: built both versions, both pass
"pulseaudio --dump-modules" with no weird messages, and the
"--disable-dbus" build works and produces audio as expected in some
simple tests including RTP.
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Lennart wrote,
>
> Hmm, yes. As it seems I broke the build for non-dbus builds.
Well, you also broke the solaris module between 0.9.15-test8 and 0.9.15.
Have you considered release candidates?
Patch follows. It would be nice if API changes could be made without
breaking things when the effort to avoid that is trivial.
Finn
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remaining ones
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warn_unused_result attribute
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The reference volume is to be used as reference volume for stored stream
volumes. Previously if a new stream was created the relative volume was
taken relatively to the virtual device volume. Due to the flat volume
logic this could then be fed back to the virtual device volume.
Repeating the whole story over and over would result in a device volume
that would go lower, and lower and lower.
This patch introduces a 'reference' volume for each sink which stays
unmodified by stream volume changes even if flat volumes are used. It is
only modified if the sink volumes are modified directly by the user.
For further explanations see http://pulseaudio.org/wiki/InternalVolumes
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This allows us to easily use different mixer controls for analog and
spdif output.
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If the X11 property data is from the same session than the client the
client may do autospawning in case the X11 property data is stale.
Closes #518.
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when the daemon goes down
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Issue pointed out by Jaroslav Kysela
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afterwards enter one-read-one-write logic
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until we have data
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PA_RATE_MAX
Fixes #525
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fixups' on resuming
The primary reason for this change is to allow time graphs that do not
go through the origin and hence smoothing starting from the origin is
not desired. This change will allow passing time data into the smoother
while paused and then abruptly use that data without smoothing using the
'quick fixup' flag when resuming.
Primary use case is allowing recording time graphs where the data
recorded originates from a time before the stream was created. The
resulting graft will be shifted and should not be smoothened to go
through the origin.
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On Wed, 4 Mar 2009, Lennart Poettering wrote:
[snip]
> > This patch disables link map/library versioning unless ld is GNU ld.
> > Another approach for solaris would be to use that linker's -M option,
> > but I couldn't make that work (due to undefined mainloop, browse and
> > simple symbols when linking pacat. I can post the errors if anyone is
> > intested.)
>
> The linking in PA is a bit weird since we have a cyclic dependency
> between libpulse and libpulsecommon which however is not explicit.
Could that affect the pacat link somehow?
What are the implications for client apps that link with the non-versioned
libraries I've been building on solaris?
[snip]
> > struct userdata {
> > pa_core *core;
> > @@ -87,15 +92,24 @@ struct userdata {
> >
> > pa_memchunk memchunk;
> >
> > - unsigned int page_size;
> > -
> > uint32_t frame_size;
> > - uint32_t buffer_size;
> > - unsigned int written_bytes, read_bytes;
> > + int32_t buffer_size;
> > + volatile uint64_t written_bytes, read_bytes;
> > + pa_mutex *written_bytes_lock;
>
> Hmm, we generally try do do things without locking in PA. This smells as
> if it was solvable using atomic ints as well.
>
> Actually, looking at this again I get the impression these mutex are
> completely unnecessary here. All functions that lock these mutexes are
> called from the IO thread so no locking should be nessary.
>
> Please don't use volatile here. I am pretty sure it is a misuse. Also
> see http://kernel.org/doc/Documentation/volatile-considered-harmful.txt
> which applies here too I think.
OK, I've removed the locks. For some reason I thought that the get_latency
function was called from two different threads.
> > +static void sink_set_volume(pa_sink *s) {
> > + struct userdata *u;
> > + audio_info_t info;
> > +
> > + pa_assert_se(u = s->userdata);
> > +
> > + if (u->fd >= 0) {
> > + AUDIO_INITINFO(&info);
> > +
> > + info.play.gain = pa_cvolume_avg(&s->virtual_volume) * AUDIO_MAX_GAIN / PA_VOLUME_NORM;
> > + assert(info.play.gain <= AUDIO_MAX_GAIN);
>
> I'd prefer if you'd use pa_cvolume_max here instead of pa_cvolume_avg()
> because this makes the volume independant of the balance.
>
> > - info.play.error = 0;
> > + info.play.gain = pa_cvolume_avg(&s->virtual_volume) * AUDIO_MAX_GAIN / PA_VOLUME_NORM;
> > + assert(info.play.gain <= AUDIO_MAX_GAIN);
>
> Same here. (i.e. for the source)
Done and done.
> > + if (u->sink->thread_info.rewind_requested)
> > + pa_sink_process_rewind(u->sink, 0);
>
> This is correct.
>
> >
> > err = ioctl(u->fd, AUDIO_GETINFO, &info);
> > pa_assert(err >= 0);
>
> Hmm, if at all this should be pa_assert_se(), not pa_assert() (so that
> it is not defined away by -DNDEBUG). However I'd prefer if the error
> would be could correctly. (I see that this code is not yours, but
> still...)
Done.
> > + case EINTR:
> > + break;
>
> I think you should simply try again in this case...
Done.
> > + case EAGAIN:
> > + u->buffer_size = u->buffer_size * 18 / 25;
> > + u->buffer_size -= u->buffer_size % u->frame_size;
> > + u->buffer_size = PA_MAX(u->buffer_size, (int32_t)MIN_BUFFER_SIZE);
> > + pa_sink_set_max_request(u->sink, u->buffer_size);
> > + pa_log("EAGAIN. Buffer size is now %u bytes (%llu buffered)", u->buffer_size, buffered_bytes);
> > + break;
>
> Hmm, care to explain this?
EAGAIN happens when the user requests a buffer size that is too large for
the STREAMS layer to accept. We end up looping with EAGAIN every time we
try to write out the rest of the buffer, which burns enough CPU time to
trip the CPU limit.
So, I reduce the buffer size with each EAGAIN. This gets us reasonably
close to the largest usable buffer size. (Perhaps there's a better way to
determine what that limit is, but I don't know how.)
> > +
> > + pa_rtpoll_set_timer_absolute(u->rtpoll, xtime0 + pa_bytes_to_usec(buffered_bytes / 2, &u->sink->sample_spec));
> > + } else {
> > + pa_rtpoll_set_timer_disabled(u->rtpoll);
> > }
>
> Hmm, you schedule audio via timers? Is that a good idea?
Perhaps not. I won't know until I test on more hardware.
But, given that we have rt priority and high resolution timers on solaris,
I think it is OK in theory...
The reason I used a timer was to minimise CPU usage and avoid the CPU
limit. Recall that getting woken up by poll is not an option for playback
unfortunately. We can arrange for a signal when the FD becomes writable,
but that throws out the whole buffer size concept, which acts to reduce
latency.
> That really only makes sense if you have to deal with large buffers and
> support rewinding.
I've implemented rewind support, but I'm still not sure that I have
understood the concept; I take it that we "rewind" (from the point-of-view
of the renderer, not the sink) so that some rendered but as yet unplayed
portion of the memblock/buffers can then be rendered again?
> Please keep in mind that the system clock and the sound card clock
> deviate. If you use the system timers to do PCM scheduling ou might need
> a pa_smoother object that is able to estimate the deviation for you.
Actually, in an earlier version I did use a smoother (after reading about
that in the wiki). But because of the non-monotonic sample counter (bug?)
I decided that it probably wasn't worth the added complexity so I removed
it. I'll put the smoother back if I can figure out the problem with the
sample counter.
>
> > + u->frame_size = pa_frame_size(&ss);
> >
> > - if ((fd = open(p = pa_modargs_get_value(ma, "device", DEFAULT_DEVICE), mode | O_NONBLOCK)) < 0)
> > + u->buffer_size = 16384;
>
> It would appear more appropriate to me if the buffer size is adjusted by
> the sample spec used.
Done.
> One last thing: it would probably be a good idea to allocate a pa_card
> object and attach the sink and the source to it.
It is possible to open /dev/audio twice by loading the solaris module
twice -- once for the sink (passing record=0) and once for source (passing
playback=0), thus giving seperate threads/LWPs for source and sink. It
might be misleading to allocate two cards in that situation?
> Right now pa_cards are mostly useful for switching profiles but even if
> you do not allow switching profiles on-the-fly it is of some value to
> find out via the cards object which source belongs to which sink.
>
> Otherwise I am happy!
>
> Thanks for your patch! I'd be thankful if you could fix the issues
> pointed out and prepare another patch on top of current git!
No problem. Patch follows. It also includes a portability fix for
pa_realpath and a fix for a bug in the pa_signal_new() error path that
causes signal data be freed if you attempt to register the same signal
twice.
> I hope I answered all your questions,
Your answers were very helpful, thanks.
Finn
>
> Lennart
>
>
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On Fri, Mar 27, 2009 at 7:21 AM, Lennart Poettering <lennart@poettering.net> wrote:
>> I tried installing the latest git sources on my Ubuntu Jaunty box but
>> it just broke sound in all my applications. For my own purposes, I'm
>> going to need to start with the Ubuntu-patched 0.9.14. However, if
>> you are willing to accept this patch I will forward port it so that it
>> applies to the latest sources. It's a completely harmless change, so
>> why not apply it?
>
> Yes, I am happy to apply it. Could you please update it for current git?
>
Great. An updated patch is attached. For symmetry, I added this
option to the alsa source module as well.
The Ubuntu folks have customized pulse so much that it is difficult
for me to get this version working on my system. For this patch I
have only made sure that it compiles. But it does pretty much the
same thing as the one for 0.9.14, which is working great for me.
Thanks,
Kyle
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This reverts commit 1c8f968282208be391f062c1656d85e2ba5078ac.
Turns out doing this is racy. The appropriate fix seems to be
38825d79123678bf0c5d156aaea4bedb888a7fcd
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