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This[^] or this[^] could be a start, I'm sure there are plenty of others out there.
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First I tried using kbhit() and getch() to recognize and capture the users input. I call the code below every frame (I tested in BL:R) but nothing happens.
PHP Code
if(kbhit())content += getch();
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I'm working on Audio Capture of my system and I did it using loopback capture method to record my audio. I recorded the file and its fine in non compressed form.
I want to make it in small size or compressed form.
But from last two days I'm searching for a way to encode it into .aac format using ffmpeg or something else.
Do anyone having any idea for this?
Please share your opinions.
Thanks!
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Are you looking to do these conversions within your program? If so, take a look at some of the responses in this [^] thread.
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I've gone through this but not getting the exact info what I want to do.
Any other suggestion.
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CodingHell wrote: what I want to do
Which is?
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Semi-programming rant
Am I the only one who gets caught using someone else program only to find out it is limited to “click this and click that”?
After embarking on using FFT to analyze audio signals and getting strange results I found out that the basic “recorder” application I am using does not truly records the audio as I expected.
The data stream is padded with several 0 before the real data is recoded.
OK , I can figure this out , but I need to go to very root of this sample application.
For example – it uses PCMFORMAT and than builds WAVE “PCM”structures.
I cannot find anywhere where the PCMFORMAT is actually defined.
I don't need an explanation what “PCM” is / does, just like to know where this PCMFORMAT structure is defined. That's all.
Cheers Vaclav
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PCMFORMAT is not in the Visual Studio headers.
Where does it come from ? what source file uses it ? I assume that if it compiles, then it should be defined somewhere ?
Are you certain it is not PCMWAVEFORMAT ?
I'd rather be phishing!
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This seems pointless - you are just confirming what I already know.
And what makes you think I am not certain?
Sorry, not in the mood for exchanging stuff like this here.
Just for kicks - it is used in CRecorder class which does not have any info where it came from.
The class itself has #include <mmsystem.h> and
#pragma comment(lib,"winmm.lib").
Have a nice day anyway.
Grumpy old man Vaclav
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When doing customer support, one always ask the obvious questions !
I'd rather be phishing!
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And the obvious answer in my case - typedef struct _PCMFORMAT.... defining four basic PCM parameters later copied to PCMWAVAE....
Sorry to be so grumpy.
Vaclav
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I don't know where the definition of PCMFORMAT is... but I can tell you what PCM is...
PCM stands for Pulse Code Modulation and is essentially a three step process for a encoding a real life signal into a digital form that can be used within a computer.
1. Sample (sample the analog signal)
2. Quantize (quantize to a level that can be encoded given the number of states you have available)
3. Encode (encode the quantized value into an appropriate numbering scheme)
It's really that simple to understand. Differences come in the variations available for these three variables. For example, your sampling rate could be 33KHz, or 48KHz, or something else. It depends on available hardware and what you expect to the highest frequency of interest. The quantization states are dependent on how many bits you are using and how many distinct possible values they can represent. Obviously, more states equals more values and therefore more fidelity in representing a signal (wider dynamic range). Third, the encoding can be an unsigned integer, a signed integer (common ones)... or can really have any arbitrary encoding a designer wishes.
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I am having problem detecting when the waveOutWrite is finished when I specify number of loops to output. I output 1kHz test tone and it should be about 5 seconds long. The waveOutWrite returns WOM_DONE to the callback function immediately when it is executed.
In debug the code works as expected, the tone is there for 5 seconds.
The WOM_DONE is still returned before the “loop” is done.
Here is the code snippet:
pcm[i].lFreq = Freq;
pcm[i].dDelay = 1;
pcm[i].whdr.dwFlags = WHDR_BEGINLOOP | WHDR_ENDLOOP ;
pcm[i].whdr.dwLoops = 5; // about 5 seconds
if(!pcm[i].C_CreateSinus())
TRACE("\nFailed pcm[i].C_CreateSinus() %i ", i );
mmres = waveOutPrepareHeader(hwout, & pcm[i].whdr, sizeof(WAVEHDR));
if (mmres != MMSYSERR_NOERROR) {ASSERT(0); bOK = FALSE;}
mmres = waveOutWrite(hwout, & pcm[i].whdr, sizeof(WAVEHDR));
Any help would be appreciated.
Cheers
Vaclav
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What does your call to waveOutOpen() look like?
Are you using a callback event?
Are you using a synchronous audio driver?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous
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David,
the output "device" is PC speaker and here is the
waveOutOpen:
mmres = waveOutOpen(&hwout, WAVE_MAPPER, &wfme,
(DWORD) CallbackWaveOutProc, 0x12345, CALLBACK_FUNCTION);
Correction - it works in "normal" non debug mode ( I got too many threads running amok most of the time) , but still returns WOM_DONE too soon for my app.I am trying to generate several frequencies and need to know when to advance to the next one.
Maybe I should get rid of the WAVE_MAPPER and specify the speaker.
Since it runs in its own thread , could that be the problem??
I am using AfxMessageBox to troubleshoot this and it is not the best way to keep track of timing of things.
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Okay, try something like:
HANDLE Done;
waveOutOpen(&hwout, WAVE_MAPPER, &wfme, (DWORD) Done, CALLBACK_EVENT);
waveOutPrepareHeader(...);
ResetEvent(Done);
waveOutWrite(...);
WaitForSingleObject(Done, INFINITE);
Vaclav_Sal wrote:
I am using AfxMessageBox to troubleshoot this and it is not the best way to keep track of timing of things.
Very true.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous
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David, I'll try the event approach. Funny things - I checked the WOM_DONE flag after the write is done and it is not set. But the callback still reports it.
Thanks for you help.
Vaclav
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David, I need some more help.
I cannot get the event HANDLE coded.
I have tryed few things but still getting "Invalid handle" from GetLastError.
I have not found an example on setting the HANDLE, all I found is "event handlers".
Keep in mind I am using MFC.
Thanks for your help.
Vaclav
HANDLE Done = new HANDLE;
//mmres = waveOutOpen(&hwout, WAVE_MAPPER, &wfme, (DWORD) Done, CALLBACK_EVENT);
mmres = waveOutOpen(&hwout, WAVE_MAPPER, &wfme,
(DWORD) &Done, 0x12345, CALLBACK_EVENT);
if (mmres != MMSYSERR_NOERROR)
{
TRACE("\nFailed waveOutOpen...");
return;
}
DWORD dResult = WaitForSingleObject( Done, INFINITE);
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Vaclav_Sal wrote:
HANDLE Done = new HANDLE;
HANDLE Done;
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"Show me a community that obeys the Ten Commandments and I'll show you a less crowded prison system." - Anonymous
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David,
I tried that with same result.
I got it doing what I need with this Mickey Mouse code :
pcm[i].whdr.dwLoops = 5; // works
if(!pcm[i].C_CreateSinus())
TRACE("\nFailed pcm[i].C_CreateSinus() %i ", i );
mmres = waveOutPrepareHeader(hwout, & pcm[i].whdr, sizeof(WAVEHDR));
if (mmres != MMSYSERR_NOERROR) {ASSERT(0); bOK = FALSE;}
mmres = waveOutWrite(hwout, & pcm[i].whdr, sizeof(WAVEHDR));
int mSeconds = 100;
while((pcm[i].whdr.dwFlags & 1) != 1)
{
Sleep(1000);
TRACE("\nWaiting.. %i ",mSeconds );
mSeconds += 100;
}
if((pcm[i].whdr.dwFlags & 1) == WHDR_DONE) // & WHDR_DONE) == WHDR_DONE)
AfxMessageBox("DONE");
It still fights with the other real time thread ( runs audio signal FFT ) , but for testing purpose it will do.
Thanks for your help.
Vaclav
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I am sure some of you will get upset by this OT post, but I am trying to reach coders with knowledge about numerical processing in C/C++.
I am a beginner in this form of computing, presently trying to implement FFT in signal detection and processing.
I am no mathematician and have trouble transferring mathematical formulas to code.
I am presently looking for some reasonable text(book) to learn about the numerical computing.
I have found this source “Numerical Recipes in C” but I am not sure if that is a good starting point for me.
I am not looking for specific processing library, I just want someplace to start learning.
Thanks for understanding
Cheers
Vaclav
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Try the Lounge or Collaboration & Testing.
Veni, vidi, abiit domum
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Hi
I ask for your cooperation
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What?
Veni, vidi, abiit domum
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