Re: wave playback headers

Thread View: borland.public.cppbuilder.multimedia

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6 total messages Started by markhatesspam Thu, 12 May 2005 19:05

#131

Author: markhatesspam
Date: Thu, 12 May 2005 19:05

31 lines
1704 bytes

I assume you open the wave out device with something like this :-

HWAVEOUT phwo; WAVEFORMATEX wvfx;
MMRESULT wh;
wh=waveOutOpen(&phwo,WAVE_MAPPER,&wvfx,(DWORD)WaveOutProc,(DWORD)this,CALLBACK_FUNCTION);

When you are processing and playing back your wave headers, you must set a bool as follows :-

In your TForm1 declaration in the public section, put bool sounding;

In your code for processing the buffers, put at the top sounding=true;
In your code for processing the buffers, put at the bottom sounding=false;

Change the routine I gave you to this :-

//---------------------------------------------------------------------------
void CALLBACK WaveOutProc(HWAVEOUT waveOut,UINT uMsg,DWORD dwInstance,DWORD 
dwParam1,DWORD dwParam2)
{
   if (dwParam1==0 || Form1->sounding) return;
   WAVEHDR *mh=(WAVEHDR *)dwParam1;
   if (uMsg==MM_WOM_DONE)
   {
     waveOutUnprepareHeader(waveOut,mh,sizeof(WAVEHDR));
     mh->dwFlags=WHDR_DONE;
   }
}

HTH
Mark Jacobs

Re: wave playback headers

#132

Author: Jonathan Benedicto
Date: Thu, 12 May 2005 19:21

35 lines
1981 bytes

<markhatesspam@spamcatch.com> wrote in message 
news:4283a8dc@newsgroups.borland.com...
>
> I assume you open the wave out device with something like this :-
>

I do, like this:

MMRESULT mmr;
WAVEFORMATEX wfx;

wfx.wFormatTag = WAVE_FORMAT_PCM;
wfx.nChannels = (WORD)channels;
wfx.nSamplesPerSec = (DWORD)frequency;
wfx.wBitsPerSample = (WORD)sample_size;
wfx.nBlockAlign = (WORD)((wfx.nChannels * wfx.wBitsPerSample) / 8);
wfx.nAvgBytesPerSec = (DWORD)(wfx.nSamplesPerSec * wfx.nBlockAlign);
wfx.cbSize = 0;

mmr = waveOutOpen(PHWaveOut, WAVE_MAPPER, &wfx, 
VComMMThread->ThreadID, 0, CALLBACK_THREAD);
if(mmr != MMSYSERR_NOERROR)
 throw Exception("waveOutOpen failed");

> When you are processing and playing back your wave headers, you must 
> set a bool as follows :-

I do have that, called IsPlaybackStarted.

> Change the routine I gave you to this :-

I didn't have the line 'mh->dwFlags=WHDR_DONE' in my code, but even 
when I added it, it didn't help.

Jonathan

Re: wave playback headers

#133

Author: Mark Jacobs
Date: Fri, 13 May 2005 08:41

9 lines
1486 bytes

Jonathan Benedicto wrote:
> I didn't have the line 'mh->dwFlags=WHDR_DONE' in my code, but even 
> when I added it, it didn't help.

I am at a loss at to to why you're getting clicks. The only difference is that 
you use CALLBACK_THREAD and I use CALLBACK_PROCEDURE. Weird.
-- 
Mark Jacobs
http://www.dkcomputing.co.uk

Re: wave playback headers

#135

Author: Jonathan Benedicto
Date: Fri, 13 May 2005 19:45

44 lines
2023 bytes

"Mark Jacobs" <http://www.jacobsm.com/mjmsg.htm?mj@critical> wrote in 
message news:42846822$1@newsgroups.borland.com...
>
> I am at a loss at to to why you're getting clicks. The only 
> difference is that you use CALLBACK_THREAD and I use 
> CALLBACK_PROCEDURE. Weird.

Thank you for trying. I just tested it again, and when I use this 
code:

for(i=0;i<PlaybackHeaderCount;++i)
{
    WaveHeader = PlaybackHeaders[i];
    if(WaveHeader->dwFlags == WHDR_DONE)
    {
        WaveHeader->dwFlags = 0;
        break;
    }
}

if(WaveHeader->dwFlags != WHDR_DONE)
{
    WaveHeader = new WAVEHDR;
    WaveHeader->lpData = new char[8192];
    WaveHeader->dwFlags = 0;

    PlaybackHeaders.push_back(WaveHeader);
}

Instead of just:

WaveHeader = new WAVEHDR;
WaveHeader->lpData = new char[8192];
WaveHeader->dwFlags = 0;

I get those clicks.

However, in the MM_WOM_DONE message, with the lower code, I have this 
code after the waveOutUnprepareHeader.

delete[] WaveHeader->lpData;
delete WaveHeader;

Jonathan

Re: wave playback headers

#136

Author: Jonathan Benedicto
Date: Fri, 13 May 2005 20:04

22 lines
1511 bytes

"Jonathan Benedicto" <incorrect@no.server> wrote in message 
news:428503d8$1@newsgroups.borland.com...
>
> Thank you for trying. I just tested it again, and when I use this 
> code:

Sorry, that should be:

for(i=0;i<PlaybackHeaderCount;++i)
{
 WaveHeader = PlaybackHeaders[i];
 if(WaveHeader->dwFlags == WHDR_DONE)
  break;
}

if(WaveHeader->dwFlags != WHDR_DONE)
{
 WaveHeader = new WAVEHDR;
 WaveHeader->lpData = new char[8192];

 PlaybackHeaders.push_back(WaveHeader);
}

Re: wave playback headers

#138

Author: Jonathan Benedicto
Date: Fri, 13 May 2005 20:40

11 lines
1376 bytes

"Mark Jacobs" <http://www.jacobsm.com/mjmsg.htm?mj@critical> wrote in 
message news:42846822$1@newsgroups.borland.com...
>
> I am at a loss at to to why you're getting clicks. The only 
> difference is that you use CALLBACK_THREAD and I use 
> CALLBACK_PROCEDURE. Weird.

More info. The click aren't coming every buffer it seems, rather every 
third or fourth.

Jonathan

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