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List Info
Thread: Re: (pay|depay)
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| Re: (pay|depay) |
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2007-01-23 07:54:54 |
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Le mardi 23 janvier 2007 à 12:28 +0100, Wim Taymans a écrit :
> The real problem is that no caps negotiation is happening. A plugin is
> free to refuse any buffers when they have no type information. If you
> are using UDP to feed the payloaders, set the "caps" property on udpsrc
> with the info from the SDP (or similar).
That's what I'm doing  But since those caps are ignored anyway (and
90000 forced as a clock rate value), it would be logical for the default
values to be set at initialization rather than at caps setting.
For example, the following code doesn't use the provided caps at all
(gstrtph263pay.c, lines 263-272):
static gboolean
gst_rtp_h263_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
{
payload->pt = GST_RTP_PAYLOAD_H263;
gst_basertppayload_set_options (payload, "video", TRUE, "H263",
90000);
gst_basertppayload_set_outcaps (payload, NULL);
return TRUE;
}
Regards
Antoine.
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| Re: (pay|depay) |
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2007-01-23 08:44:59 |
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| On Tue, 2007-01-23 at 14:54 +0100, Antoine Pitrou wrote:
> Le mardi 23 janvier 2007 à 12:28 +0100, Wim Taymans a écrit :
> > The real problem is that no caps negotiation is happening. A plugin is
> > free to refuse any buffers when they have no type information. If you
> > are using UDP to feed the payloaders, set the "caps" property on udpsrc
> > with the info from the SDP (or similar).
>
> That's what I'm doing But since those caps are ignored anyway (and
> 90000 forced as a clock rate value), it would be logical for the default
> values to be set at initialization rather than at caps setting.
>
The base class (will) extract and use other fields such as ssrc, rtptime
and seqnum-base to perform various checks and handle sync. These fields
have to be in the caps in the future so some negotiation has to be done.
Wim
> For example, the following code doesn't use the provided caps at all
> (gstrtph263pay.c, lines 263-272):
>
> static gboolean
> gst_rtp_h263_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps)
> {
> payload->pt = GST_RTP_PAYLOAD_H263;
> gst_basertppayload_set_options (payload, "video", TRUE, "H263",
> 90000);
> gst_basertppayload_set_outcaps (payload, NULL);
>
> return TRUE;
> }
>
> Regards
>
> Antoine.
>
>
>
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--
Wim Taymans fluendo.com>
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