SV: [speex-dev] C++ wrapper for speex

[Jonas Tärnström]

Hi, 
Think I might have found a problem.

AFAIK, lpHdr->dwBufferLength stores the length of the buffer in octets
(bytes).

It should be 320 if you are expecting 160 PCM 16-bit samples.

//JT

<p>> -----Ursprungligt meddelande-----
> Från: owner-speex-dev at xiph.org [mailto:owner-speex-dev at xiph.org] För
> Ronald Madrid
> Skickat: den 26 maj 2004 12:39
> Till: speex-dev at xiph.org
> Kopia: tgrand at canvaslink.com
> Ämne: Re: [speex-dev] C++ wrapper for speex
> 
> 
> hi Tom,
> 
> i downloaded your speex wrappers and they're really
> what i'm looking for! i really cannot worry about
> container support at the moment because i'm working
> with real-time audio, and hopefully toward VoIP when
> everything else is in order.
> 
> im using waveform to capture data from the microphone.
> the raw PCM sample is stored in the WAVEHDR
> structure's member lpData, and this variable is of
> LPSTR type.
> 
> if you have the time, can you please check on my test
> code below and see where i could be having problems
> with. (this is the handler that processes captured
> audio)
> 
> LRESULT CRecordSound::OnSoundData(WPARAM wParam,
> LPARAM lParam)
> {
> 	LPWAVEHDR lpHdr = (LPWAVEHDR) lParam;
> 
> 	int buflen = lpHdr->dwBufferLength; //160
> 	float * buf = toFloat(lpHdr->lpData, buflen);
> 
> 	// Encode some audio
> 	int nRet = enc.encode(buf, buflen);
> 	unsigned char *compressed = enc.getOutput();
> 	int clen = enc.getOutputLength();
> 	int speechDetected = enc.getSpeechDetected();
> 
> 	// delete temporary float buffer
> 	delete []buf;
> 
> 	// Decode it
> 	int decodedSamples = dec.decode(compressed, clen);
> 
> 	// Prepare decoded data for WAV
> 	BYTE pSound = new BYTE[decodedSamples *
> sizeof(short)];
> 	memcpy(pSound, (BYTE*)dec.getOutput(), decodedSamples
> * sizeof(short));
> 
> 	// Create and initialise the WAVEHDR structure
> 	WAVEHDR* pSpeexHdr = new WAVEHDR;
> 
> 	pSpeexHdr->lpData = (char*)pSound;
> 	pSpeexHdr->dwBufferLength = decodedSamples *
> sizeof(short);
> 	pSpeexHdr->dwFlags = 0L;
> 	pSpeexHdr->dwLoops = 0L;
> 
> 	// output audio to speaker
> 	m_Player->PostThreadMessage(WM_PLAYSOUND_PLAYBLOCK,
> GetCurrentThreadId(),(LPARAM) pSpeexHdr);
> 
> 	// clean up
> 	// delete pSeexHdr;
> 	// delete [] pSound;
> 
> 	return 1;
> }
> 
> this produces unintelligible audio. may be you can
> give me an opinion on how i can properly reconstruct
> my PCM sample ( into WAVHDR) after the decode. this
> would really mean a lot to me.
> 
> many of thanks!!!
> 
> best regards,
> ronald
> 
> 
> 
> 
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