search for: yueweng

...ket. Hence, all the breaking portion is filled with previous packet. This trick seems to work so far. I am not sure what is the side effect. I think jitter buffering is more correct way to solve this problem but I think this is not so easy. Is there got any source code to reference from? Regards, YueWeng --- "Kleijn, J.S. de" <J.S.d.Kleijn@student.tue.nl> wrote: > Hi, > > You should implement a jitter buffer, this buffers > the audio to prevent the 'breaking'. > > My VoIP application called VoIPerized has a jitter > buffer. You can try it to see if...

> 16 bit ints have a range of -32768 to 32767. If you divide > -32768 by 32767.0 you end up with -1.00003051850948 which > is a bad thing. > > Try normalizing with a value of 32768.0. No. Speex expects values in the +-32767 range, not +-1.0. Just converting from int16 to float *is* the right thing to do. Jean-Marc -- Jean-Marc Valin <Jean-Marc.Valin@USherbrooke.ca>

...(decoder_state, NULL, shortData); //check if shortData[] array is zero bytes. m_IsZeroData = IsZeroData(shortData); } m_IsZeroData will be set to false when new voice packet arrive. It seems to me that speex_decode_int() can not be execute too many times after shortData[] become zero. Regards, YueWeng __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

...d speex_decode takes float * as an arguement to encode and decode the sound. However, when I get the PCM data from the sound card under win32, it is a just 16 bit array. May I know how do I convert this 16 bit value to speex float format and to convert back? Is there got any routine to do this? YueWeng __________________________________ Do you Yahoo!? Read only the mail you want - Yahoo! Mail SpamGuard. http://promotions.yahoo.com/new_mail

...oy speex 1.1.6 in my application. With no option set, I can hear that the voice sounds a little bit artificial like robot. Any idea what causes this? I use openh323 with speex, but it seems ok. Is it neccessary for me to use more other filter prior to encode the sound or after decode my sound? yueweng __________________________________ Do you Yahoo!? Yahoo! Mail - You care about security. So do we. http://promotions.yahoo.com/new_mail

...is my setting from sound card using mm_system sdk. WAVEFORMATEX *wfx = (WAVEFORMATEX *)input; wfx->nSamplesPerSec = 8000; wfx->nChannels = 1; wfx->wFormatTag = WAVE_FORMAT_PCM; wfx->wBitsPerSample = 16; wfx->nBlockAlign = 2; wfx->nAvgBytesPerSec = 16000; Thanks in advance, YueWeng __________________________________ Do you Yahoo!? Take Yahoo! Mail with you! Get it on your mobile phone. http://mobile.yahoo.com/maildemo

...ot;hellololololololo....". This does not always happened. The chance of happen is quite random. This effect does not happen in my LAN. It only happen when ping time is about 500 milisecond or more. Is it a speex problem? Any suggestion how to resolve this issue? Thanks in advance! Regards, YueWeng __________________________________ Do you Yahoo!? The all-new My Yahoo! - Get yours free! http://my.yahoo.com

...e and seems that (not confirmed) the speaker callback WaveOutCallback() function which call speex_decode_int(decoder_state, NULL, shortData) (when no data arrived for PLC purpose) seems to consume a lot of CPU slice. Is this normal or I am making a mistake other portion of the program. Regards, YueWeng __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

...entirely smooth, enough audio is buffered to avoid dropouts. In my program using Speex, I've been able to have a dialup modem user send audio and video to two people at the same time and not have any breakups in the audio. (It was *very* low bitrate video.) :) Hope this helps, Tom Tay YueWeng <yueweng@yahoo.com> wrote: > > Dear all, > > Have anybody uses speex codec over 56.6K bit/s line > that hear clearly in both direction before? I perform > a testing with one side using 56.6K dialup modem and > the other side using broadband. The user that uses > 56.6...

...just try decoding by passing NULL instead of the SpeexBits struct. > I think jitter buffering is more correct way to solve > this problem but I think this is not so easy. Is there > got any source code to reference from? Look for the speex_jitter.h header. Jean-Marc > Regards, > YueWeng > > --- "Kleijn, J.S. de" <J.S.d.Kleijn@student.tue.nl> > wrote: > > Hi, > > > > You should implement a jitter buffer, this buffers > > the audio to prevent the 'breaking'. > > > > My VoIP application called VoIPerized has a...

Hmmm... sorry i mislead you Tay... i didn't realise my encoder (libfishsound) was again shifting the data i gave it back to being 32767 based internally. Zen. ----- Original Message ----- From: "Jean-Marc Valin" <Jean-Marc.Valin@USherbrooke.ca> To: "Tay YueWeng" <yueweng@yahoo.com> Cc: "speex" <speex-dev@xiph.org> Sent: Wednesday, December 29, 2004 1:04 PM Subject: Re: [Speex-dev] Sound distorted after normalized. > 16 bit ints have a range of -32768 to 32767. If you divide > -32768 by 32767.0 you end up with -1.00003051...

...ith your application, it's likely buggy. If the result isn't OK, then it can be: 1) Normal given the bandwidth/bit-rate used 2) A conditioning problem with your audio (i.e. DC not removed) 3) A bug in Speex (quite rare at this point) Jean-Marc Le jeudi 30 d?cembre 2004 ? 17:17 -0800, Tay YueWeng a ?crit : > Hi all, > > I have deploy speex 1.1.6 in my application. With no > option set, I can hear that the voice sounds a little > bit artificial like robot. Any idea what causes this? > I use openh323 with speex, but it seems ok. Is it > neccessary for me to use more...

Hi, > 1) Normal given the bandwidth/bit-rate used Do you mean the bit-rate that I should set in the speex codec? > 2) A conditioning problem with your audio (i.e. DC > not removed) What is DC? YueWeng __________________________________ Do you Yahoo!? Yahoo! Mail - now with 250MB free storage. Learn more. http://info.mail.yahoo.com/mail_250

...ed==0 || lpHdr==NULL) return ERROR_SUCCESS; ::waveInUnprepareHeader(m_hRecord, lpHdr, sizeof(WAVEHDR)); Here lpHdr->lpData contains the audio data in a character array. Now here I want to use Speex codec for encoding the data so the encoding function is called (I am thankful to Tay YueWeng for the function). char *encode(char *buffer, int &encodeSize) { char *encodedBuffer = new char[RECBUFFER/2]; /* RECBUFFER = 2000 */ short speexShort; float speexFloat[RECBUFFER/2]; void *mEncode = speex_encoder_init(&speex_nb_mode);...

Hi, I am new to this newsgroup. I have a problem using the Speex library. I have recorded sound data using a character buffer like char recMessg[BUFFERSIZE]. I have problem converting this to the float array for encoding. Also help me in converting the decoded information in float array back to character array. Can anybody give me function codes for this conversion. Thanks in

> short temp_short; > float temp_float; > float floatData[number_of_sample]; > > for (int i=0; i < number_of_sample; i++) > { > memcpy(&temp_short, &src[i*2], 2); > temp_float = temp_short; > floatData[i] = temp_float; > } > > yueweng > Thanks for the encoding code can yu plz send me the decoding code for conversion from float array to character array.

...cket lost is less than 10%. I have tried 8KHz, 16KHz, 32KHz. The bigger it gets, the more lousy the quality. I believe I have enough bandwidth since the packet lost is less than 10%. The only factor that could affect the quality is may be delayed. Any one have any idea of what is wrong? Regards, YueWeng __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

...the third parameter of speex_jitter_put(), should I use the GetTickCount() value at the point when I first receive a voice packet from the microphone? Finally, what is the use of the third parameter (timestamp) of speex_jitter_get()? Thanks very much. Hopes my question is not too many. Regards, YueWeng __________________________________ Do you Yahoo!? Plan great trips with Yahoo! Travel: Now over 17,000 guides! http://travel.yahoo.com/p-travelguide

I'm going to test the echo cancellation... but before doing something wrong, i want to know what is the right way to use it... ------------------------------------------------------------------------------------- short * speakerSample; //will contain what the speakers are going to play short * microphoneSample; //what the microphone is going to register short* cancelledSample; //the ouput