Speex dev - Nov 2006 - Integrating speex with VideoNet application: Constantbackground noise

Hi,

I've changed the m_waveFormatEx.wBitsPerSample for both record buffer and
playSound buffer, changed my array from char to short and I'm still getting
the same constant background noise. I notice that when I talk into the mike, I
will get a slightly louder noise, can't hear any clear speech... Any idea
what's wrong?

Regards,
Carine

----- Original Message ----
From: John Miles <jmiles@pop.net>
To: Carine Liang <carineliang@yahoo.com.sg>; speex-dev@xiph.org
Sent: Friday, 3 November 2006 12:32:43 AM
Subject: RE: [Speex-dev] Integrating speex with VideoNet application:
Constantbackground noise



 
DIV {
MARGIN:0px;}



Yes, 
it's necessary; Speex will encode signed 16-bit PCM data and decode to 
the same format.  See the examples that come with 
it.

 

8-bit audio is not something you would ever want to 
use.

 

-- 
john

RAD 
Game Tools


  -----Original Message-----
From: Carine Liang 
  [mailto:carineliang@yahoo.com.sg]
Sent: Thursday, November 02, 2006 
  12:18 AM
To: John Miles; speex-dev@xiph.org
Subject: Re: 
  [Speex-dev] Integrating speex with VideoNet application: Constantbackground 
  noise



  
  Hi 
  John,

Thanks for your reply. 

Yes, my output device is in 8-bit 
  mode, same as my input mode. I'm actually working in char (8 bit) arrays.
Is
  it necessary to work in signed short integers only? I changed all the short 
  arrays in the example to char. 

Carine


  ----- 
  Original Message ----
From: John Miles <jmiles@pop.net>
To: 
  carineliang@yahoo.com.sg; speex-dev@xiph.org
Sent: Thursday, 2 November 
  2006 2:04:39 PM
Subject: RE: [Speex-dev] Integrating speex with VideoNet 
  application: Constantbackground noise


  DIV {
MARGIN:0px;}


  At 
  first glance it looks like you are opening the output device in 8-bit mode 
  (m_waveFormatEx.wBitsPerSample =8;).  You will need to use 16-bit mode if you
expect to write
  an array of signed short integers to the audio buffer..  8-bit PCM 
  is an unsigned mode, no longer used much these 
  days.

   

  Also, a good debugging trick is to include something like this in your 
  output sample processing loop:

   

      static FILE *hack = 
  fopen("test.raw","wb");

      fwrite(output, 2, FRAME_SIZE, 
  hack);

   

  After your app is closed, there will be a file called "test.raw" 
  in its working directory, which you can load into Sound Forge or a similar 
  audio editing package for closer inspection without relying on your output 
  buffers and playback code to work properly.  
  

   

  -- 
  john

  RAD 
  Game Tools

  
    -----Original Message-----
From: speex-dev-bounces@xiph.org 
    [mailto:speex-dev-bounces@xiph.org]On Behalf Of Carine 
    Liang
Sent: Wednesday, November 01, 2006 9:40 PM
To: 
    speex-dev@xiph.org
Subject: Re: [Speex-dev] Integrating speex with 
    VideoNet application: Constantbackground noise



    
    Hi,

Can 
    someone please help me with my problem below. Any suggestions is 
    appreciated. 

thanks,
Carine


    ----- 
    Original Message ----
From: Carine Liang 
    <carineliang@yahoo.com.sg>
To: speex-dev@xiph.org; 
    speex-dev@xiph.org
Sent: Tuesday, 31 October 2006 1:05:49 PM
Subject: 
    [Speex-dev] Integrating speex with VideoNet application: Constant background
    noise


    
    Hi,

I am developing a peer-to-peer video conference application 
    which uses speex as a codec for the voice. 

I am new to speex, so 
    please bear with me if I asked the obvious. After I added the encode and 
    decode function to my MFC app, I heard a constant background noise, even 
    when no one is speaking into the microphone. 

#define FRAME_SIZE 
    160

The application is coded in MFC C++. The record buffer is set to 
    be the same as the FRAME_SIZE such that my callback function is called 
    everytime 160 bytes of data is recorded.

Here's what I did in the 
    initialisation (called only once).
m_waveFormatEx.wFormatTag 
    =WAVE_FORMAT_PCM;
m_waveFormatEx.nChannels 
    =1;
m_waveFormatEx.wBitsPerSample =8;
m_waveFormatEx.cbSize 
    =0;
m_waveFormatEx.nSamplesPerSec = 8000;
m_waveFormatEx.nBlockAlign 
    =1;
m_waveFormatEx.nAvgBytesPerSec = 8000;

int quality 
    =8;
speex_bits_init(&bits);
enc_state = 
    speex_encoder_init(&speex_nb_mode);
speex_encoder_ctl(enc_state, 
    SPEEX_SET_QUALITY, &quality);


In my recording callback 
    function
LRESULT RecordSound::OnSoundData(WPARAM wParam, LPARAM 
    lParam)
{
 ....
    dataPtr = (char *)lpHdr 
    ->lpData;
    dataSize = (int)lpHdr 
    ->dwBytesRecorded;

    for(int 
    k=0;k<FRAME_SIZE;k++)
       input[k] = 
    dataPtr[k];     //input is 
    float[FRAME_SIZE]
    
    
    speex_bits_reset(&bits);
    speex_encode(enc_state, 
    input, &bits);
    encByte = 
    speex_bits_write(&bits, cbits, 200);

    //send 
    cbits to peer computer via sockets
}


In the receiver's 
    initialization function, I've initialized the 
    speex_decoder.
speex_bits_init(&bits);
dec_state = 
    speex_decoder_init(&speex_nb_mode);

In the receiver's socket 
    function, it reads from socket and store the data in cbits (char 
    array).
{
    speex_bits_read_from(&bits, cbits, 
    retvalue); //retvalue is 38
    speex_decode(dec_state, 
    &bits, output); //where output is float array

    
    for(int k=0;k<FRAME_SIZE;k++)
       out[k] = 
    output[k];  //out is a char array
    
    
   PostThreadMessage( WM_PLAYSOUND_PLAYBLOCK, FRAME_SIZE, 
    (LPARAM)out );
}







    
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It could be a million different things, unfortunately.  Focus on comparing
your code to the Speex examples, and looking for places where they diverge.
Also, try taking Speex out of the picture altogether, just to make sure you
can send plain uncompressed PCM audio through your network layer.

-- john
RAD Game Tools
  -----Original Message-----
  From: Carine Liang [mailto:carineliang@yahoo.com.sg]
  Sent: Sunday, November 05, 2006 4:51 PM
  To: John Miles; speex-dev@xiph.org
  Subject: Re: [Speex-dev] Integrating speex with VideoNet application:
Constantbackground noise


  Hi,

  I've changed the m_waveFormatEx.wBitsPerSample for both record buffer and
playSound buffer, changed my array from char to short and I'm still getting
the same constant background noise. I notice that when I talk into the mike,
I will get a slightly louder noise, can't hear any clear speech... Any idea
what's wrong?

  Regards,
  Carine
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