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Re: can anyone suggest how to convert matlab code into c code..for resampling function

enhzflep23-Aug-14 18:31

23-Aug-14 18:31

Here's some code that does re-sampling of audio. No idea if it'll be of any use to you - googling for how to do it it was not much easier than implementing it. It was used for up-sampling 8363 samples/sec sound into 44100 samples/sec sound. It was used for working with the audio samples as found in .XM files (somewhat similar to Amiga .mod files, or less-so, .MIDI files)

There's bound to be a bunch of code here that's useless to you, but I've no idea which format your .WAV files are, so I'll leave it to you to use that which you need. You're also on-your-own when it comes to reading the samples from a WAV file - in my instance, the header of the samples is different to the .WAV file header - my data also came with a single header - the wav file contains a number of chunks, each of these has its own header.

The re-sampling is of the linear variety.
You can determine the play-time of the WAV file by looking at a number of the chunk headers inside it. Don't ask me how, as I haven't bothered to do it, and don't know. (nor am I interested)

This page seems to be an easier read than the Wikipedia WAV page - http://www.sonicspot.com/guide/wavefiles.html[^]

C++

float *convert8tofloat(char *input, int numSamples)
{
    float *result = new float[numSamples];
    int i;
    for (i=0; i<numSamples; i++)
    {
        result[i] = input[i] / 128.0; //(((input[i]+128)/255.0) - 0.5) * 2.0;
    }
    return result;
}

float *convert16tofloat(short *input, int numSamples)
{
    float *result = new float[numSamples];
    int i;
    for (i=0; i<numSamples; i++)
    {
        result[i] = (int)input[i] / 32768.0; //(((input[i]+128)/255.0) - 0.5) * 2.0;
    }
    return result;
}

// t in range [0..1]
char interpolate8(char val1, char val2, float t)
{
    short difference;
    difference = val2 - val1;
    return val1 + t*difference;
}
// t in range [0..1]
short interpolate16(short val1, short val2, float t)
{
    int difference;
    difference = val2 - val1;
    return val1 + t*difference;
}
// t in range [0..1]
float interpolateFloat32(float val1, float val2, float t)
{
    float difference;
    difference = val2 - val1;
    return val1 + t*difference;
}


char *resample8Interp(char *input, int numSamplesIn, int numSamplesOut)
{
    char *output;
    output = new char[numSamplesOut];
    float curIndex, proportion, step;
    char curVal;
    int i, intPart;

    output[0] = input[0];
    output[numSamplesOut-1] = input[numSamplesIn-1];
    step = (float) (numSamplesIn-1) / (numSamplesOut-1);

    for (i=1; i<numSamplesOut-1; i++)
    {
        curIndex = (float) i * step;
        intPart = floor(curIndex);
        proportion = curIndex - intPart;
        curVal = interpolate8(input[intPart], input[intPart+1], proportion);
        output[i] = curVal;
    }
    return(output);
}

short *resample16Interp(short *input, int numSamplesIn, int numSamplesOut)
{
    short *output;
    output = new short[numSamplesOut];
    float curIndex, proportion, step;
    short curVal;
    int i, intPart;

    output[0] = input[0];
    output[numSamplesOut-1] = input[numSamplesIn-1];
    step = (float) (numSamplesIn-1) / (numSamplesOut-1);

    for (i=1; i<numSamplesOut-1; i++)
    {
        curIndex = (float) i * step;
        intPart = floor(curIndex);
        proportion = curIndex - intPart;
        curVal = interpolate16(input[intPart], input[intPart+1], proportion);
        output[i] = curVal;
    }
    return(output);
}

float *reSampleFloat32(float *srcArray, int origNumSamples, int origRate, int newRate, int &outNumSamples)
{
    outNumSamples = (origNumSamples * newRate) / origRate;
    float *output = new float[outNumSamples];
    int i, intPart;
    float fractionalPart, curIndex, curVal, step;

    step = (float)(origNumSamples-1) / (outNumSamples-1);
    output[0] = srcArray[0];
    output[outNumSamples-1] = srcArray[origNumSamples-1];
    for (i=0; i<outNumSamples; i++)
    {
        curIndex = step * i;
        intPart = floor(curIndex);
        fractionalPart = curIndex - intPart;
        curVal = interpolateFloat32(srcArray[intPart], srcArray[intPart+1], fractionalPart);
        output[i] = curVal;
    }
    return output;
}

Here's some examples of implementation. I dont remember a thing about the code, haven't touched it in years - nor am I inclined to. That's an exercise for you. I assume some of the comments are misleading - I just changed the one that says "only works for 16 bit samples" - it had said "only works for 8 bit samples, which was clearly inaccurate.

Finally, not that in my case I wanted to convert the samples to be a 32-bit floating point format in the range [-1..1] which simplifies drawing them to screen.

Good luck!

C++

void onSmpListChange(HWND smpListBox, XMFile *mSong)
{
    int curIns, curSmp;
    HWND dlg = GetParent(smpListBox);
    HWND insList = GetDlgItem(dlg, IDC_INS_LIST);

    curIns = SendMessage(insList, LB_GETCURSEL, 0, 0);
    curSmp = SendMessage(smpListBox, LB_GETCURSEL, 0, 0);

    XMSample *curSample = &mSong->instruments[curIns].samples[curSmp];
    int bits=8, numSamples = curSample->header.sampleLength;
    float *tmpBuffer;

    if (curSample->header.compression == 0)
        SetDlgItemText(dlg, IDC_COMP, "Delta");
    else
    {
        SetDlgItemText(dlg, IDC_COMP, "ADPCM");
        return;
    }

    // only works for 16 bit samples
    if (curSample->header.type & 0x16)
    {
        printf("Resampling 16bit sound, %d samples - %20.20s\n", numSamples, curSample->header.sampleName);
        numSamples /= 2;
        SetDlgItemInt(dlg, IDC_BITS, 16, true);
        char fileName[48];
        strcpy(fileName, "16bit 8363hz.wav");
//        strncat(fileName, curSample->header.sampleName, 20);
        writeWavFile(fileName, curSample->data, numSamples, 16, 1, 8363);

        short *sBuf = resample16Interp((short*)curSample->data, numSamples, 44100*numSamples / 8363);
        strcpy(fileName, "16bit 44100hz.wav");
//        strncat(fileName, curSample->header.sampleName, 20);
        writeWavFile(fileName, sBuf, (44100*numSamples)/8363, 16, 1, 44100);
        delete sBuf;

        tmpBuffer = convert16tofloat((short*)curSample->data, numSamples);
    }

    else
    {
        printf("Resampling 8bit sound, %d samples - %20.20s\n", numSamples, curSample->header.sampleName);
        SetDlgItemInt(dlg, IDC_BITS, 8, true);
        char fileName[48];
        strcpy(fileName, "8bit 8363hz.wav");
//        strncat(fileName, curSample->header.sampleName, 20);
        writeWavFile(fileName, curSample->data, numSamples, 8, 1, 8363);

        char *cBuf = resample8Interp((char*)curSample->data, numSamples, 44100*numSamples / 8363);
        strcpy(fileName, "8bit 44100hz.wav");
//        strncat(fileName, curSample->header.sampleName, 20);
        writeWavFile(fileName, cBuf, (44100*numSamples)/8363, 8, 1, 44100);
        delete cBuf;

        tmpBuffer = convert8tofloat((char*)curSample->data, numSamples);
    }
    // wParam = buffer (float)  // lParam = count
    SetDlgItemInt(dlg, IDC_NUM, numSamples, true);

    SendDlgItemMessage(dlg, IDC_WAV_IMG, WM_SET_DATA, (WPARAM)tmpBuffer, (LPARAM)numSamples);// * 44100 / 8835);



    delete g_curSamples;
    g_curSamples = tmpBuffer;
    g_numSamples = numSamples;// * 44100/8355;
}


void onConvertBtn(HWND parentDlg)
{
    float *mSamples;
    int nSamples;

//    mSamples = reSample(g_curSamples, g_numSamples, 8363, 44100, nSamples);
    mSamples = reSampleFloat32(g_curSamples, g_numSamples, xmRate, 44100, nSamples);
    SendDlgItemMessage(parentDlg, IDC_WAV_IMG2, WM_SET_DATA, (WPARAM)mSamples, (LPARAM)nSamples);
    delete mSamples;
}

Re: can anyone suggest how to convert matlab code into c code..for resampling function

mybm124-Aug-14 19:30

mybm1

24-Aug-14 19:30

thank you fren....

Re: can anyone suggest how to convert matlab code into c code..for resampling function

jschell22-Aug-14 10:21

jschell

22-Aug-14 10:21

Steps
- Analyze matlab code to understand it. This might involve researching matlab provided methods.
- Learn C
- Use the above to write C code.

Researching existing C libraries might also be helpful.

Re: can anyone suggest how to convert matlab code into c code..for resampling function

Albert Holguin28-Aug-14 5:51

Albert Holguin

28-Aug-14 5:51

Best answer really... I have yet to see a "code converter" that did a good job without generating cluttered, hard to read code (that can run slow compared to if you have just done the conversion manually).

how to call a function inside another function in file like utility.c

mybm120-Aug-14 0:03

mybm1

20-Aug-14 0:03

Quote:
how to call a function inside another function in file like utility.c

Re: how to call a function inside another function in file like utility.c

Richard MacCutchan20-Aug-14 1:00

Richard MacCutchan

20-Aug-14 1:00

That question is impossible to answer. Please give some proper detailed context about your problem. Calling a function is just the same wherever you call it from.

Re: how to call a function inside another function in file like utility.c

mybm120-Aug-14 1:22

mybm1

20-Aug-14 1:22

utility.c file consist of following function:

function list_file_directory() // function 1
{
//listing wave file from directory;
}
function wavread()   // function 2<pre>

{
// reading the .wav file;
}
function noise
{
//here i want to call the both above function and perform futher calculation //is it possible?
}

main.c
{
call function 1
{display}
call function 2
{
display
}
}

Re: how to call a function inside another function in file like utility.c

Richard MacCutchan20-Aug-14 3:06

Richard MacCutchan

20-Aug-14 3:06

maibam debina wrote:
i want to call the both above function and perform futher calculation //is it possible?

Of course it is; just call them. What is your problem with this?

Re: how to call a function inside another function in file like utility.c

WuRunZhe21-Aug-14 2:20

WuRunZhe

21-Aug-14 2:20

It can not be understood. Could you tell more detail? Smile | :)

Re: how to call a function inside another function in file like utility.c

Richard Andrew x6422-Aug-14 8:59

Richard Andrew x64

22-Aug-14 8:59

In C, you cannot define a function inside another function. All functions must stand on their own.

The difficult we do right away...
...the impossible takes slightly longer.

error: invalid operands to binary / (have ‘float’ and ‘int *’)

mybm119-Aug-14 20:24

mybm1

19-Aug-14 20:24

Quote:
error: invalid operands to binary / (have ‘float’ and ‘int *’)

how to solve this error?

Re: error: invalid operands to binary / (have ‘float’ and ‘int *’)

enhzflep19-Aug-14 20:51

enhzflep

19-Aug-14 20:51

You can't divide by a pointer. You can divide by what it points to, but you cant divide the pointer itself.

Take a look at the following. Basically, you need to dereference the pointer, as I've done in #3.

C++

#include <cstdio>

int main()
{
    int numerator = 10;
    float denominator = 2.7;

    // 1. Using no pointers
    float result = numerator / denominator;
    printf("%d / %f = %f\n", numerator, denominator, result);



    // 2. Using pointers incorrectly
    int *ptrToNumerator;
    ptrToNumerator = &numerator;
    // below line causes the following error:
    // error: invalid operands of types 'int*' and 'float' to binary 'operator/'|
    result = ptrToNumerator / denominator;
    printf("%f\n", result);



    // 3. Using pointers appropriately
    result = *ptrToNumerator / denominator;
    printf("%f\n", result);

    return 0;
}

Re: error: invalid operands to binary / (have ‘float’ and ‘int *’)

mybm119-Aug-14 21:01

mybm1

19-Aug-14 21:01

<blockquote class="quote"><div class="op">Quote:</div>
	for(i=0;i<*SizeOfData;i++)
	{
	datasample[i]=square(samplesValue1[i]);
	squaring1=(datasample[i]*datasample[i]);
	sum +=squaring1;
        }
	summation_input=(float)sum/ *SizeOfData;   
	printf("\n%f",summation_input);
	
	fclose(fp);</blockquote>

wen i change summation_input=(float)sum/SizeOfData;
to summation_input=(float)sum/ *SizeOfData some unknown error is generating given below

Quote:
dithermain.c text+0x430): undefined reference to `square'
collect2: ld returned 1 exit status

Re: error: invalid operands to binary / (have ‘float’ and ‘int *’)

enhzflep19-Aug-14 21:18

enhzflep

19-Aug-14 21:18

That error is telling you that the linker can't find the function body for your function square.
If it's in another c/cpp file, you have to compile and link it too.

Otherwise, you can just place the square function in the same c/cpp file, but make sure it appears before it's first used. (otherwise you'll get a compiler error that says the symbol is unrecognized)

Re: error: invalid operands to binary / (have ‘float’ and ‘int *’)

mybm120-Aug-14 0:42

mybm1

20-Aug-14 0:42

in function after writing return();
is it possible to continue process will it be effective ?

Re: error: invalid operands to binary / (have ‘float’ and ‘int *’)

David Crow20-Aug-14 3:15

David Crow

20-Aug-14 3:15

maibam debina wrote:
in function after writing return();
is it possible to continue process...

Not in that same function.

"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

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

Variable not same across process in DLL

peterasloan17-Aug-14 18:49

peterasloan

17-Aug-14 18:49

I have 2 dlls where one is run time loaded (Run.dll) and calls the other(other.dll)
Also the application calls the other.dll as well.

Now the other.dll has a static variable in it that is only used in itself i.e internally to the dll which gets changed by one of it's functions.

At the start of the program I call a this function in the other.dll to set the variable but later on when I run time load the run.dll which calls the function in the other.dll the variable is not set.

I thought the any variables in the other.dll which is statically linked to the app and to the run.dll will only have one instance of itself in memory especially regarding the variables?

How can I solve it to ensure that the variable in other.dll is the same across the process?

I forget to mention that I'm using the windows api etc.

Re: Variable not same across process in DLL

Richard MacCutchan17-Aug-14 20:39

Richard MacCutchan

17-Aug-14 20:39

It's difficult to visualise the actual sequence of events here, but it may be that on the second call into this dll it is getting reloaded somehow. Either that or there is another bug somewhere.

Re: Variable not same across process in DLL

leon de boer18-Aug-14 5:18

leon de boer

18-Aug-14 5:18

You wont be able to access anything in other.dll declared in such a way from Run.dll because they will have different instance handles. The only thing preventing a big crash in try to do so will be MFC's safe pointers because it is an access violation to allow it.

There are two ways around the problem provide a function that returns the status on a standard DLL interface function something like

int OtherDLLStatus (void) {

   return (OtherDLLStaticVar);
};

Then publish it on the DLL interface and get the static variable status via that call. I think that is probably all you need.

However Option 2 is use shared memory mapping

http://msdn.microsoft.com/en-us/library/ms810613.aspx[^]

In vino veritas

Call MFC regular dll from other app

john563217-Aug-14 1:56

john5632

17-Aug-14 1:56

Hi,

I am trying to call a MFC dialog based regular dll from other application. The dll function "BOOL CApplicationApp::InitInstance()" does not call to any dialog. I want to trigger UI on the click on button so i created a exported function which call first dilaog of application. But when I create a object of class it does load resource I think so crashed.

Suggest me how to do?

Re: Call MFC regular dll from other app

«_Superman_»17-Aug-14 6:10

«_Superman_»

17-Aug-14 6:10

You could step into the exported function using a debugger to find what is going on.
MFC DLLs require the first line of a function to be - AFX_MANAGE_STATE(AfxGetStaticModuleState());
If you haven't done that, you could try by putting that as the first line of the exported function.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++) (October 2009 - September 2013)

Polymorphism in C

Re: Call MFC regular dll from other app

leon de boer18-Aug-14 5:28

leon de boer

18-Aug-14 5:28

The short answer is between very difficult and you can't do this because not all of MFC is thread safe.

There are specific parts of MFC designed for threading general background

http://msdn.microsoft.com/en-us/library/975t8ks0%28v=vs.90%29.aspx[^]

The tips page will give you the specific problem

http://msdn.microsoft.com/en-us/library/h14y172e%28v=vs.90%29.aspx#_core_accessing_mfc_objects_from_non_2d_mfc_threads[^]

QUOTE:

If you have a multithreaded application that creates a thread in a way other than using a CWinThread object, you cannot access other MFC objects from that thread. In other words, if you want to access any MFC object from a secondary thread, you must create that thread with one of the methods described in Multithreading: Creating User-Interface Threads or Multithreading: Creating Worker Threads. These methods are the only ones that allow the class library to initialize the internal variables necessary to handle multithreaded applications.

In vino veritas

How manage the lose focus from CListCtrl Control

Drakesal16-Aug-14 20:45

Drakesal

16-Aug-14 20:45

Hi i am doing a program with a clistctrl with custom draw and i have custom highlight color bar.
Now my problem is when i am with mouse on CListCtrl the bar is color i wish, when i leave to go on other control
i don't know how change the color in gray of the highlight bar, i post the code for you:

void CPubFoldersView::OnNMCustomdraw(NMHDR *pNMHDR, LRESULT *pResult)
{
	NMLVCUSTOMDRAW* pCD = (NMLVCUSTOMDRAW*)pNMHDR;
	int nRow = pCD->nmcd.dwItemSpec;
	CListCtrl& m_MainTable = GetListCtrl();
	CString szInEvidence;

	//Remove standard highlighting of selected (sub)item.
	pCD->nmcd.uItemState = CDIS_DEFAULT;

	if (VirtualRowArray.GetCount())
		szInEvidence=VirtualRowArray[nRow].Field[4];

	switch(pCD->nmcd.dwDrawStage)
	{
		case CDDS_PREPAINT:
			*pResult = CDRF_NOTIFYSUBITEMDRAW;
			break;
			
		case CDDS_ITEMPREPAINT:
			*pResult = CDRF_NOTIFYSUBITEMDRAW;
			break;
			
		case CDDS_ITEMPREPAINT|CDDS_SUBITEM:
		{
			if (m_MainTable.GetItemState(nRow, LVIS_SELECTED)==LVIS_SELECTED && m_MainTable.GetItemState(nRow, LVIS_FOCUSED)==LVIS_FOCUSED)
			{
				pCD->clrTextBk	= RGB(167,205,240);    //Selected color
				*pResult = CDRF_NEWFONT;
     		}
			if (m_MainTable.GetItemState(nRow, LVIS_SELECTED)==LVIS_SELECTED && m_MainTable.GetItemState(nRow, LVIS_FOCUSED)!=LVIS_FOCUSED)
			{
				pCD->clrTextBk = RGB(197, 206, 216);    //Only focused color
				*pResult = CDRF_NEWFONT;
     		}
		}
			break;

		default:
			*pResult = CDRF_DODEFAULT;
	}
}

Re: How manage the lose focus from CListCtrl Control

SoMad16-Aug-14 21:10

SoMad

16-Aug-14 21:10

Perhaps I misunderstand your problem, but it sounds like all you are missing is to check if the list control itself has focus. If it does, you set the color as you are doing now, otherwise you set the gray color.

Soren Madsen

"When you don't know what you're doing it's best to do it quickly" - Jase #DuckDynasty

Re: How manage the lose focus from CListCtrl Control

Drakesal16-Aug-14 21:12

Drakesal

16-Aug-14 21:12

No i need to draw gray when i leave the row selected but i click on another control.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.