[speex-dev] SPEEX_SET_USER_HANDLER once again

[Jean-Marc Valin]

Hi,

I think what happened is that you did not write the "message" length.
With user-callbacks, you also need to say how large the message. The
size is in bytes and encoded in 4 bits.

Besides, you're probably the first one to use user-callbacks. BTW, why
didn't you want to use Ogg. It's much simpler to use and overhead can be
made minimal anyway.

        Jean-Marc

Le ven 07/11/2003 à 11:17, Norman Biehl a écrit :
> Hi, 
> 
> Sorry!  Marc Gimpel. I wrote it in a false thread before. It was my
> first time. J
> 
>  
> 
> I have to write a small programm which should be able to record
> speeches 
> and in addition synchronize the recorded speeches with measuring data.
> 
> My idea is to record the speech in the normal way with speex and
> without 
> ogg. If a sync message was received, i write a custom in-band messages
> using mode 13 into the stream. Furthermore, i fill a structure with
> the 
> sync data and write the structure into an array. To determine the
> position 
> of the sync structure in the array, i have to write the array index of
> the 
> sync structure into the stream. Inside the user callback i have to
> read 
> the array index of the reached sync point from the stream and send it 
> within a notification message to the application. 
> 
> The Problem is, after the decoder reached the custom in-band messages
> and 
> executed the user callback, the stream is corrupted and speex_decode()
> returns -2. 
> 
> I don't know where the problem is. 
> 
> I can't find any sample code for custom in-band messages. 
> 
> Is there anyone who can help? 
> 
> Here some sample code: 
> 
> /********************************** encoder 
> *********************************************/ 
> 
> // read raw data from serving buffer 
> void CSpeexEncoderThread::Decode(char * pcData, DWORD dwLength){ 
>          
>         ... 
> 
>         speex_encode(st, s, &bits); // encode 
> 
>         ... 
> 
>         if (syncmsg == TRUE && synccount < 256){ // is there a sync
> message? 
> 
>                 syncstruct[synccount].sync_value = syncvalue; //fill
> the sync structure 
> 
>                 ... 
> 
>                 speex_bits_pack(&bits, 13, 5); //custom in-band
> messages 
> 
>                 // write the array index of the sync structure into
> the stream (max. 256 
> sync points) 
>                 speex_bits_pack(&bits, synccount, 8); 
> 
>                 synccount++ 
>         } 
> 
>         nbBytes = speex_bits_write(&bits, cbits, MAX_FRAME_BYTES); 
> 
>         ... 
> 
>         // write the encoded data into the end buffer 
> 
>         ... 
> 
>         speex_bits_reset(&bits); 
> 
>         ... 
> } 
> /********************************** encoder end 
> ********************************************/ 
> 
> /************************************* decoder 
> *********************************************/ 
> 
> int CSpeexDecoderThread::SpeexUserCallback(SpeexBits *bits, void
> *state, 
> void *data){ 
>         ... 
> 
>         // read the array index of the corresponding sync structure 
>         int index = speex_bits_unpack_unsigned(bits, 8); 
> 
>         SendNotifyMessage(l_sdthread->m_hWnd, USER_PLAYBACK_MESSAGE,
> SYNC_DATA, 
> LPARAM(index)); 
> 
>         return 0; 
> } 
> 
> inline int speex_bits_init_buffer_ex(SpeexBits *bits, void *buff, int 
> buf_size){ 
>                  
>         if (buff == NULL || buf_size == 0) 
>                 return -1; 
> 
>         memset(bits, 0, sizeof(SpeexBits)); 
> 
>         bits->bytes = (char*)buff; 
>         bits->buf_size = buf_size; 
>         bits->nbBits=buf_size << 3; 
> 
>         return 0; 
> } 
> 
> int CSpeexDecoderThread::DecodePlay(void* state, SpeexStereoState
> stereo, 
>         char* pcData, DWORD dwLength, int nchannels, int frame_size,
> int 
> synccount){ 
> 
>         ... 
> 
>         if (synccount > 0){ 
>                 callback.callback_id = 0; 
>                 callback.func = SpeexUserCallback; 
>                 callback.data = this; 
>                 speex_decoder_ctl(state, SPEEX_SET_USER_HANDLER,
> &callback); 
>         } 
>         ... 
> 
>         speex_bits_init_buffer_ex(&bits, pcData, dwLength); 
>          
>         while (1 == 1){ 
> 
>                 ... 
> 
>                 retval = speex_decode(state, &bits, output); 
> 
>                 if (retval == -1){ 
>                         return -1; //return DECODE_ENDOFSTREAM; 
>                 } else if (retval == -2){ 
>                         return -2; 
>                 } 
>                 ... 
> 
>                 // play the sample 
>         } 
> } 
> 
> The second question, is there something wrong with the speex_uwb_mode 
> since version 1.1? 
> It don't work. Only speex_nb_mode and speex_wb_mode works. 
> 
> Norman 
> 
> ps: sorry for my pure english. 
> 
>  

-- 
Jean-Marc Valin, M.Sc.A., ing. jr.
LABORIUS (http://www.gel.usherb.ca/laborius)
Université de Sherbrooke, Québec, Canada


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