Interleave with Alsasink Pipeline Problem
adweldon
david.weldon at vecima.com
Tue Jul 8 08:27:40 PDT 2014
Wow… Yeah, it was right in front of me the whole time…
Thanks for catching that for me! Works as expected now!
From: Tim Müller [via GStreamer-devel] [mailto:ml-node+s966125n4667823h48 at n4.nabble.com]
Sent: July-07-14 4:15 PM
To: David Weldon
Subject: Re: Interleave with Alsasink Pipeline Problem
On Mon, 2014-07-07 at 15:50 -0700, adweldon wrote:
> In my application, I tried to set the channel-mask by doing the
> following below; which never seemed to work. Using your debug trap, I
> see now that channel_mask is set to 0x21 for some reason?? Even
> hard-coding it to 0x03 still still results in the wrong mask. Perhaps
> I'm setting the caps on the pad incorrectly...
0x21 is FRONT_LEFT | REAR_RIGHT, which is what your GValueArray code
does. Maybe you meant FRONT_RIGHT ?
Regards
-Tim
>
> Output:
>
> 0:00:00.705327387 12248 0xccf770 DEBUG GST_EVENT
> gstpad.c:5098:gst_pad_send_event_unchecked:<alsasink:sink> have event
> type caps event: 0x7f9be4003c70, time 99:99:99.999999999, seq-num 66,
> GstEventCaps, caps=(GstCaps)"audio/x-raw\,\ format\=\(string\)S16LE\,\
> layout\=\(string\)interleaved\,\ rate\=\(int\)44100\,\ channels\=\(int
> \)2\,\ channel-mask\=\(bitmask\)0x0000000000000021";
> 0:00:00.705378555 12248 0xccf770 DEBUG GST_CAPS
> gstutils.c:2852:gst_pad_query_accept_caps:<alsasink:sink> accept caps
> of audio/x-raw, format=(string)S16LE, layout=(string)interleaved,
> rate=(int)44100, channels=(int)2,
> channel-mask=(bitmask)0x0000000000000021
>
>
> Code Snippet:
>
> interleave = gst_element_factory_make ("interleave",
> "interleave");
> g_assert (interleave != NULL);
>
> //Create audiochannel position array... Compiled with ignore
> warnings flag becuase GValueArray is not supported any longer.
> GValueArray *positions = g_value_array_new (2);
> GValue val = { 0, };
> g_value_init (&val, GST_TYPE_AUDIO_CHANNEL_POSITION);
> g_value_set_enum (&val, GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT);
> g_value_array_append (positions, &val);
> g_value_reset (&val);
> g_value_set_enum (&val, GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT);
> g_value_array_append (positions, &val);
> g_value_unset (&val);
>
> g_print ("setting channel positions\n");
> g_object_set(G_OBJECT(interleave), "channel-positions-from-input",
> FALSE, NULL);
> g_object_set (interleave, "channel-positions", positions, NULL);
>
> guint64 channel_mask = GST_AUDIO_CHANNEL_POSITION_MASK(FRONT_LEFT)
> | GST_AUDIO_CHANNEL_POSITION_MASK(FRONT_RIGHT);
> g_print ("channel_mask: 0x%x\n", channel_mask);
>
> GstCaps *caps = gst_caps_new_simple(
> "audio/x-raw",
> "rate", G_TYPE_INT, 22000,
> "channels", G_TYPE_INT, 2,
> "channel-mask", GST_TYPE_BITMASK, channel_mask,
> NULL);
>
> GstPad *srcpad = gst_element_get_static_pad (interleave, "src");
> g_assert(srcpad);
> gst_pad_set_caps(srcpad, caps );
>
>
>
>
> ______________________________________________________________________
> From: Tim Müller [via GStreamer-devel] [ml-node+[hidden email]]
> Sent: Monday, July 07, 2014 2:57 PM
> To: David Weldon
> Subject: Re: Interleave with Alsasink Pipeline Problem
>
>
> On Mon, 2014-07-07 at 11:04 -0700, adweldon wrote:
>
> Hi David,
>
>
> > I'm trying to create a fairly simple pipeline using test sources,
> the
> > interleave element and my alsasink. I'm essentially trying to have
> > different test sources interleaved into a multichannel stream, and
> played
> > out on the alsasink. We are starting with basic two channel stereo
> right
> > now, so nothing too complicated.
> >
> > The following pipeline using pulsesink, works:
> > gst-launch-1.0 -v interleave name=i ! pulsesink audiotestsrc
> name=t1
> > volume=0.2 freq=133 ! queue ! i. audiotestsrc name=t2 volume=0.1
> freq=200 !
> > queue ! i.
> >
> > Replacing pulsesink with alsasink results in:
> >
> > WARN basesrc gstbasesrc.c:2933:gst_base_src_loop:<t1> error:
> Internal data
> > flow error.
> > WARN basesrc gstbasesrc.c:2933:gst_base_src_loop:<t1> error:
> streaming task
> > paused, reason not-negotiated (-4)
> > INFO GST_ERROR_SYSTEM
> gstelement.c:1834:gst_element_message_full:<t1>
> > posting message: Internal data flow error.
> > GST_ERROR_SYSTEM gstelement.c:1857:gst_element_message_full:<t1>
> posted
> > error message: Internal data flow error.
> >
> > Also:
> > WARN alsa conf.c:4694:snd_config_expand: alsalib error: Unknown
> parameters
> > {AES0 0x02 AES1 0x82 AES2 0x00 AES3 0x02}
> > WARN alsa pcm.c:2239:snd_pcm_open_noupdate: alsalib error: Unknown
> PCM
> > default:{AES0 0x02 AES1 0x82 AES2 0x00 AES3 0x02}
>
>
>
> I don't think this warning has anything to do with it.
>
> > Removing a source, the audio will play... I have created a custom
> app that
> > does basically the same thing as the launch pipeline, but it results
> in the
> > same errors. I have also tried playing with channel masks and what
> not in
> > the app to no avail...
> >
> > Any help is appreciated,
>
> The debug log should tell you what the problem is:
>
> $ GST_DEBUG=*:6 gst-launch-1.0 -v interleave name=i ! alsasink \
> audiotestsrc name=t1 volume=0.2 freq=133 ! queue ! i. \
> audiotestsrc name=t2 volume=0.1 freq=200 ! queue ! i. \
> 2>&1 | grep --max-count=1 -B25 not-negotiated
>
> Problem appears to be that interleave output audio with 2
> unpositioned
> channels (channels=2,channel-mask=0), whereas alsa wants left/right
> for
> channels=2 (i.e. channels=2,channel-mask=3). pulsesink doesn't seem
> to
> care that's why it works.
>
> This makes it work (i.e. forcing a left/right layout on the caps):
>
> gst-launch-1.0 -v interleave name=i ! capssetter
> caps='audio/x-raw,channel-mask=(bitmask)0x03' ! alsasink
> audiotestsrc
> name=t1 volume=0.2 freq=133 ! queue ! i. audiotestsrc name=t2
> volume=0.1 freq=200 ! queue ! i.
>
> In code one would do that via interleave's properties I suppose, but
> with gst-launch this is the only way.
>
> Cheers
> -Tim
>
>
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]</user/SendEmail.jtp?type=node&node=4667823&i=0>
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--
Tim Müller, Centricular Ltd - http://www.centricular.com
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