Re: [Linphone-developers] oRTP: Problem with non-8000Hz sample rates?

[Simon Morlat]

Hi,

Sorry for my late answer...
Is clockrate set to 44100 in the PayloadType struct for L16 44100 ? And for 
both sender and receivers ?
Otherwise I recommend you to build ortp with --enable-debug and then enable 
debug traces with ortp_set_log_level_mask(). This will display a lot of 
traces but we'll see what happens with the packets.

Simon

Le Monday 11 June 2007 17:18:42 Nicholas J Humfrey, vous avez écrit :
> Hi,
>
> I have been using RAT (Robust Audio Tool) to create a L16 44100Hz RTP
> packet stream (payload type 11) and also a payload type 0 (PCMU,
> 8000Hz) to compare it with.
>
> PayloadType 11 packets are 320 bytes (3ms) and PayloadType 0 streams
> are 160 bytes (20ms). Both streams contain 160 samples.
>
>
> Here is a snippet of my main loop:
>
> while( 1 )
> {
>       mblk_t* packet = packet = rtp_session_recvm_with_ts( session, ts );
>       if (packet==NULL) {
>               printf("Packet is NULL.\n" );
>       } else {
>               printf("Got packet, ts=%d, seq=%d, pt=%d\n",
>                                       rtp_get_timestamp( packet ),
>                                       rtp_get_seqnumber( packet ),
>                                       rtp_get_payload_type( packet ) );
>       }
>
>       ts+=160;
> }
>
>
>
> With the PT0 stream I get:
>
> [hwickabab:~/ortp-test] njh% ./recvtest 239.255.125.216 5004
> Local address: 239.255.125.216
> Local port: 5004
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> ortp-message-payload type changed to 0(PCMU) !
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> Got packet, ts=1726968515, seq=24969, pt=0
> Got packet, ts=1726968675, seq=24970, pt=0
> Got packet, ts=1726968835, seq=24971, pt=0
> Got packet, ts=1726968995, seq=24972, pt=0
> Got packet, ts=1726969155, seq=24973, pt=0
> Got packet, ts=1726969315, seq=24974, pt=0
> Got packet, ts=1726969475, seq=24975, pt=0
> Got packet, ts=1726969635, seq=24976, pt=0
> Got packet, ts=1726969795, seq=24977, pt=0
> ...........
>
>
> Which is fine, however when sending PT11 I get:
>
> [hwickabab:~/ortp-test] njh% ./recvtest 239.255.125.216 5004
> Local address: 239.255.125.216
> Local port: 5004
> ortp-message-payload type changed to 11(L16) !
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> Packet is NULL.
> .......
>
>
> And never manages to receive a packet. I verified that the difference
> between the timestamps is 160 on both streams but cannot workout why
> oRTP is unable to receive the PT11 stream... oRTP transmits PT11
> steams fine.
>
>
> Any suggestions?
>
>
> nick.