[Speex-dev] Speex + Ogg package

[Jean-Marc Valin]

If by webchat you mean anything interactive, then I can already tell you
what the problem is. TCP+Ogg. For anything real-time, you want UDP/RTP
without Ogg. Also, you need to take into account the fact that computers
do *not* have accurate clock and their soundcards drift. None of these
problems are fatal, but you need to take that into account in the
design.

	Jean-Marc

On Mon, 2006-08-07 at 02:53 +0200, Jere Gmail wrote:
> I'm currently working on a speex + theora webchat.
> I have both working alone, but to make them work together and to know
> where the package goes, I'm trying to use ogg packages.
> With theora there has been no problem, but with speex I can't make it
> work. The problem is that for a second it works great, but then it
> begings to gain lag, and in a little time it has 5-10 lag seconds
> (into the same machine, working on loopback). Currently I'm packaging
> 4 frames per package (FRAMES_PACKET=4). 
> Any help will be greatly appreciated.
> 
> 
> Into the encoder I have this code:
> 
> speex_bits_reset(&enc_bits);
> for(int i=0;i<FRAMES_PACKET;i++)
> {
>     int nb_samples;
>     //Here I get the microphone data. 
>     while((nb_samples=Check_Mic(Mic_data))==0);
>     speex_encode_int(enc_state, Mic_data, &enc_bits);
> 
>     total_samples += nb_samples;
>     speex_bits_insert_terminator(&enc_bits);
> 
>     //The time stamp 
>     if(i==0)
>         ((int*)packet)[0]=total_samples;
> }
> int nbBytes = speex_bits_write(&enc_bits, packet+4, 2000);
> tam=nbBytes+4;
> 
> //Now the ogg package
> op.packet = (unsigned char *)packet;
> op.bytes = nbBytes+4;
> op.b_o_s = 0;
> op.packetno = packet_id;
> packet_id++;
> 
> ogg_stream_packetin(&os, &op);
> ogg_stream_flush(&os, &audio_page);
> 
> return audio_page;
> }
> 
> As for the decoder I have this. 
> 
> //Incoming data from udp is on buffer
> char *buffer=ogg_sync_buffer(&oy,4096);
> memcpy(buffer,buff,len);
> ogg_sync_wrote(&oy,len);
> while(ogg_sync_pageout(&oy,&audio_page)>0)
> {
>     if (stream_init == 0) 
>     {
>         ogg_stream_init(&os, ogg_page_serialno(&audio_page));
>         stream_init = 1;
>     }
>     queue_page(&audio_page);
> 
>     while(ogg_stream_packetout(&os,&op)>0)
>     { 
>         int b;
>         ogg_stream_pagein(&os, &audio_page);
>         int len=(audio_page.body_len-4)/FRAMES_PACKET;
> 
>         char *datos=(char*)op.packet;
>         char m[100];
>         sprintf(m,"paq %d", op.packetno);
>         System::Console::WriteLine(gcnew String(m));
> 
>         int t=((int *)datos)[0];
>         for(int i=0;i<FRAMES_PACKET;i++)
>             speex_jitter_put(&jitter,(datos+4)+len*i,len,t
> +FRAME_SIZE*i); 
>     }
> }
> 
> 
> -- 
> http://www.apple.com
> A veces me da por ahi. Otras como que no. 
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