Compression/Decompression Wave File and MP3

Hello, everybody. Sorry to disturb you all.

Currently, I have a speech recording and playback software developed by Microsoft Visual C++ 6.0. The software is used to train children with speech problem and scores will be calculated and showed at the end of each practice session. The software is able to record and playback real-time.

Children use this software at home and save their practice records in a single floppy disk. Then, children will bring the floppy disk with practice records inside when they return to our centre. There are 20 wave files that must be saved in a single floppy disk. Due to space insifficiency, one floppy disk is 1.44M in capacity.
Total size of 20 wave files = 20*188k = 3,760,000 bytes
Total floppy disk needed = (3,760,000)/1,440,000 = 2.6 floppy disks
But, I must save all the 20 wave files into a single floppy disk

Our problem is we are not able to save all 20 wave files in a single floppy disk. We cant afford a CD-RW for each child and we must use floppy disk. The solution is we have to compress the wave file to save the files in a floppy and decompress the files back to wave file in order to listen to how the children practice at home.

I am totally new to this as the software is written by one of my previous friend who worked together with me in a voluntary speech rehabilitation centre. We need this software to train children in the centre. I work part time there.

But, my problem is how to call any CODEC dll into correct place into my current project platform without causing any bugs? Please forgive me if I have asked a very silly question, I am sorry. After I have added the cpp and h files into my current project paltform, I dont know what should I do next.

My final destination is to save all 20 wave files in a single floppy disk. I didnt restrict that I must use compression/decompression methods but I dont know what else should I use.

Hope you can give me some guidances on how to do it or you please link me to pages that help me to do so. I promise I can learn as independent as possible but I really need your guidance at this very beginning, please.

Please, I really appreciate all your help.

Convert your wavs to mp3, which is a much more compact audio format.
http://www.google.com/search?q=wav+to+mp3

Or maybe this
http://technology.niagarac.on.ca/cou...ileFormat.html
Use this to drop the bit rate, number of audio channels or whatever else you can get rid of to reduce the file size.
Speech doesn't need stereo, and it doesn't need a particularly high bit rate either.

Maybe you should post a question on the Windows forum. I've tried to find out how to "talk to" a CODEC, and I never found a complete reference. But, I did find some sample code in an SDK... I think it was the DirectX SDK.

Clearly, there is a standardized Windows-CODEC interface, because most audio programs that can query a CODEC's capabilities.

I just found this at MSDN.

There is a ton of documentation in the SDKs, and on MSDN... if you can wade through it and find what you're looking for. :rolleyes: You might try downloading the Platform SDK, the Media Format SDK, and the DirectX SDK. The description of the Windows Media SDK seems to imply that it covers only the Windows Media Format (WMA and WMV), but I wonder if you use other CODECs in the same way.

Quote:

I am totally new to this as the software is written by one of my previous friend...

Are you a programmer? If you have never programmed before, you will need some help. (This stuff is not for beginners, and most experienced programmers would have to do some research.) You will also need the program's source code (the C or CPP files) you cannot edit the execuatable (EXE) files.

Quote:

Originally Posted by Salem

Convert your wavs to mp3, which is a much more compact audio format.
http://www.google.com/search?q=wav+to+mp3

Or maybe this
http://technology.niagarac.on.ca/cou...ileFormat.html
Use this to drop the bit rate, number of audio channels or whatever else you can get rid of to reduce the file size.
Speech doesn't need stereo, and it doesn't need a particularly high bit rate either.

Hi, Salem, thank you very much for your post, appreciate.
I cant use third-party software that is 'outside' of my software project platform. I need to call the CODEC dll from my software.
My problem is I dont know how to call the dll from my software.

Can you please link me to the page that got tutorial on how to link the dll from my software?
For your information, I didnt use stereo. I used mono, 16kHz, 16 bits.

In order to reach my purpose to save all wave files in single floppy, I need to reduce sampling rate from 16k to 8k and ALSO reduce the 16 bits to 8 bits. But, I dont know by reducing 16 bit to 8 bit will influence much on the quantization level and thus influence much on the scores pratice by children.
That's why I think compression is the only solution for me to save all 20 wave files into single floppy disk.
Please correct me if I am wrong.

Can you please link me to the page with tutorials or details on how to call CODEC dll from my software its own? Please really need your help, please, Salem

Quote:

Originally Posted by DougDbug

Maybe you should post a question on the Windows forum. I've tried to find out how to "talk to" a CODEC, and I never found a complete reference. But, I did find some sample code in an SDK... I think it was the DirectX SDK.

Clearly, there is a standardized Windows-CODEC interface, because most audio programs that can query a CODEC's capabilities.

I just found this at MSDN.

There is a ton of documentation in the SDKs, and on MSDN... if you can wade through it and find what you're looking for. :rolleyes: You might try downloading the Platform SDK, the Media Format SDK, and the DirectX SDK. The description of the Windows Media SDK seems to imply that it covers only the Windows Media Format (WMA and WMV), but I wonder if you use other CODECs in the same way.

Are you a programmer? If you have never programmed before, you will need some help. (This stuff is not for beginners, and most experienced programmers would have to do some research.) You will also need the program's source code (the C or CPP files) you cannot edit the execuatable (EXE) files.

Hi, DougDbug, thanks a lot for replying my post, thanks.
For your information, I am quite new to programming, but I have learnt the program codes done my friends before, so I think I understand the program flows so far. (if I am not mistake)

I am so afraid, you mean so far nobody could manage to 'talk' to a codec?

When you said "Platform SDK, the Media Format SDK, and the DirectX SDK", do you mean I have to use three of them or only one of them? Could you please explain?

Regarding your last paragraph, I have found several complete source codes from many websites including zip/unzipp and codec, but I just dont know how to call the CODEC dll from my software. I couldnt find a tutorial or details on that.

Can you please link me to the pages that can guide me? Or if you know how to call with source codes available, can you please teach me? I could attach them here anytime if you want. I promise I will learn as independent as possible, I wont disturb you much, please. I really need some guidance and helps at this beginning stage, please

Quote:

I just dont know how to call the CODEC dll from my software.

I think it's more like instantiating the codec by calling the COM CoCreateInstance to create a codec object.

Codec programming guide

BTW, is this application being developed and used by a not-for-profit organization?

Quote:

am so afraid, you mean so far nobody could manage to 'talk' to a codec?

No! Almost all audio programs (WAV editors, etc.) can interface to any codec. It's just that I don't know how, and I haven't found a reference yet. :( (Maybe Bob's reference is what I was looking for! :) )

Quote:

When you said "Platform SDK, the Media Format SDK, and the DirectX SDK", do you mean I have to use three of them or only one of them? Could you please explain?

Sorry, I don't know. I never did find that particular information. I have the Platform SDK and the DirectX SDK. I haven't read everything in them. There is a surprising amount of documentation in the SDKs. But, it seems to be organized more like a tutorial than a reference.... I didn't see organized groups of functions that I could browse through to see which ones I need etc. Hopefully, there are others here who can give you better guidance... I've been fooling around with Windows programming for quite a while, but I'm still just a beginner.

P.S. I looks like Bob's MSDN link only covers the Windows Media Format... I don't know how much of that applies to other codecs (MP3, etc.). Then again, WMA files might work for you.

Ooooh! I found something very interesting on MSDN: Using CODEDs to Compress Wave Audio. I hope it's not too outdated... It references Win95 and WinNT.

P.P.S. Yes, It's outdated... The Platform SDK says that the ACM codecs are "deprecated". :( It says there are 3 types of codecs:

ACM (and VCM)
Direct Show Filters
DirectX Media Objects (DMOs)

I found that in the DirectX section of the Platform SDK, and I assume that it's duplicated in the DirectX SDK.

Quote:

Originally Posted by BobS0327

I think it's more like instantiating the codec by calling the COM CoCreateInstance to create a codec object.

Codec programming guide

BTW, is this application being developed and used by a not-for-profit organization?

Hi, BobS0327, thank you very much for your reply.

For your information, this software will be used for children with speech inability or speech problem in our speech rehabilitation centre. I work part time there to help with the rehabilitation process.

I am sorry, I dont understand. Could you please elaborate on the "COM CoCreateInstance" that you stated above?

Please, I really need your help in this very beginning. I promised I will be as independent as possible, please.

Quote:

Originally Posted by DougDbug

No! Almost all audio programs (WAV editors, etc.) can interface to any codec. It's just that I don't know how, and I haven't found a reference yet. :( (Maybe Bob's reference is what I was looking for! :) )

Sorry, I don't know. I never did find that particular information. I have the Platform SDK and the DirectX SDK. I haven't read everything in them. There is a surprising amount of documentation in the SDKs. But, it seems to be organized more like a tutorial than a reference.... I didn't see organized groups of functions that I could browse through to see which ones I need etc. Hopefully, there are others here who can give you better guidance... I've been fooling around with Windows programming for quite a while, but I'm still just a beginner.

P.S. I looks like Bob's MSDN link only covers the Windows Media Format... I don't know how much of that applies to other codecs (MP3, etc.). Then again, WMA files might work for you.

Ooooh! I found something very interesting on MSDN: Using CODEDs to Compress Wave Audio. I hope it's not too outdated... It references Win95 and WinNT.

P.P.S. Yes, It's outdated... The Platform SDK says that the ACM codecs are "deprecated". :( It says there are 3 types of codecs:

ACM (and VCM)
Direct Show Filters
DirectX Media Objects (DMOs)

I found that in the DirectX section of the Platform SDK, and I assume that it's duplicated in the DirectX SDK.

Hi, DougDbug, thank you very much for your reply. You are very kind.

I read that link before (Using CODEDs to Compress Wave Audio) and I tried to put it in Microsoft Visual C++ 6.0 and I cant manage to run it without bug. I failed to do so.

I just dont know how and where should I start now. Please, anyone can help me?

Quote:

I read that link before (Using CODEDs to Compress Wave Audio) and I tried to put it in Microsoft Visual C++ 6.0 and I cant manage to run it without bug. I failed to do so.

All you have to do is write the find_driver function as described in the link and do the two step conversion also described in the link.
Use the DriverEnumProc as a reference for your find_driver function.

Code:

// Command line compile with CL #pragma comment( lib, "msacm32.lib" ) #include <windows.h> #include <math.h> #include <mmsystem.h> #include <mmreg.h> #include <msacm.h> #include <stdio.h> BOOL CALLBACK FormatEnumProc(HACMDRIVERID hadid, LPACMFORMATDETAILS pafd, DWORD dwInstance, DWORD fdwSupport) { printf(" %4.4lXH, %s\n", pafd->dwFormatTag, pafd->szFormat); return TRUE; // Continue enumerating. } BOOL CALLBACK DriverEnumProc(HACMDRIVERID hadid, DWORD dwInstance, DWORD fdwSupport) { printf(" id: %8.8lxH", hadid); printf(" supports:\n"); if (fdwSupport & ACMDRIVERDETAILS_SUPPORTF_ASYNC) printf(" async conversions\n"); if (fdwSupport & ACMDRIVERDETAILS_SUPPORTF_CODEC) printf(" different format conversions\n"); if (fdwSupport & ACMDRIVERDETAILS_SUPPORTF_CONVERTER) printf(" same format conversions\n"); if (fdwSupport & ACMDRIVERDETAILS_SUPPORTF_FILTER) printf(" filtering\n"); // Get some details. ACMDRIVERDETAILS dd; dd.cbStruct = sizeof(dd); MMRESULT mmr = acmDriverDetails(hadid, &dd, 0); if (mmr) { printf("we have an acmDriverDetails error\n"); } else { printf(" Short name: %s\n", dd.szShortName); printf(" Long name: %s\n", dd.szLongName); printf(" Copyright: %s\n", dd.szCopyright); printf(" Licensing: %s\n", dd.szLicensing); printf(" Features: %s\n", dd.szFeatures); printf(" Supports %u formats\n", dd.cFormatTags); printf(" Supports %u filter formats\n", dd.cFilterTags); } // Open the driver. HACMDRIVER had = NULL; mmr = acmDriverOpen(&had, hadid, 0); if (mmr) { printf("Driver open error\n"); } else { DWORD dwSize = 0; mmr = acmMetrics((HACMOBJ)had, ACM_METRIC_MAX_SIZE_FORMAT, &dwSize); if (dwSize < sizeof(WAVEFORMATEX)) dwSize = sizeof(WAVEFORMATEX); // for MS-PCM WAVEFORMATEX* pwf = (WAVEFORMATEX*) malloc(dwSize); memset(pwf, 0, dwSize); pwf->cbSize = LOWORD(dwSize) - sizeof(WAVEFORMATEX); pwf->wFormatTag = WAVE_FORMAT_UNKNOWN; ACMFORMATDETAILS fd; memset(&fd, 0, sizeof(fd)); fd.cbStruct = sizeof(fd); fd.pwfx = pwf; fd.cbwfx = dwSize; fd.dwFormatTag = WAVE_FORMAT_UNKNOWN; mmr = acmFormatEnum(had, &fd, FormatEnumProc, 0, 0); if (mmr) { printf("FormatEnum Error\n"); } free(pwf); acmDriverClose(had, 0); } return TRUE; // Continue enumeration. } int main(void) { // Get the ACM version. DWORD dwACMVer = acmGetVersion(); printf("ACM version %u.%.02u build %u", HIWORD(dwACMVer) >> 8, HIWORD(dwACMVer) & 0x00FF, LOWORD(dwACMVer)); if (LOWORD(dwACMVer) == 0) printf(" (Retail)"); printf("\n"); // Show some ACM metrics. printf("ACM metrics:\n"); DWORD dwCodecs = 0; MMRESULT mmr = acmMetrics(NULL, ACM_METRIC_COUNT_CODECS, &dwCodecs); if (mmr) { printf("We have an acmMetrics error\n"); } else { printf("%lu codecs installed\n", dwCodecs); } // Enumerate the set of enabled drivers. printf("Enabled drivers:\n"); mmr = acmDriverEnum(DriverEnumProc, 0, 0); if (mmr) printf("We have an acmDriver Enum error\n"); return 0; }

First of all my disclaimer, I have almost no experience doing audio coding. With that in mind, I've coded my interpretation of the CODEC link provide by DougDbug. It's totally up to you to verify whether or not the code is error free and appropriate for your requirements. Obviously, you'll have to make some changes to the output since I used the same parms on input and output and a few other minor changes are also needed.

Code:

// Command line compile with CL #pragma comment( lib, "msacm32.lib" ) #include <windows.h> #include <math.h> #include <mmsystem.h> #include <mmreg.h> #include <msacm.h> #include <stdio.h> typedef struct { HACMDRIVERID hadid; WORD wFormatTag; } FIND_DRIVER_INFO; // callback function for format enumeration BOOL CALLBACK find_format_enum(HACMDRIVERID hadid, LPACMFORMATDETAILS pafd, DWORD dwInstance, DWORD fdwSupport) { FIND_DRIVER_INFO* pdi = (FIND_DRIVER_INFO*) dwInstance; if (pafd->dwFormatTag == (DWORD)pdi->wFormatTag) { // found it pdi->hadid = hadid; return FALSE; // stop enumerating } return TRUE; // continue enumerating } BOOL CALLBACK find_format_enum2(HACMDRIVERID hadid, LPACMFORMATDETAILS pafd, DWORD dwInstance, DWORD fdwSupport) { FIND_DRIVER_INFO* pdi = (FIND_DRIVER_INFO*) dwInstance; if (pafd->dwFormatTag == (DWORD)pdi->wFormatTag && pafd->pwfx->nChannels == 1 && pafd->pwfx->nSamplesPerSec == 11025) { pdi->hadid = hadid; return FALSE; // stop enumerating } return TRUE; // continue enumerating } BOOL CALLBACK find_driver_enum(HACMDRIVERID hadid, DWORD dwInstance, DWORD fdwSupport) { FIND_DRIVER_INFO* pdi = (FIND_DRIVER_INFO*) dwInstance; DWORD dwSize = 0; ACMFORMATDETAILS fd; // open the driver HACMDRIVER had = NULL; MMRESULT mmr = acmDriverOpen(&had, hadid, 0); WAVEFORMATEX* pwf = NULL; if (mmr) { // some error return FALSE; // stop enumerating } // enumerate the formats it supports mmr = acmMetrics((HACMOBJ)had, ACM_METRIC_MAX_SIZE_FORMAT, &dwSize); if (dwSize < sizeof(WAVEFORMATEX)) dwSize = sizeof(WAVEFORMATEX); // for MS-PCM pwf = (WAVEFORMATEX*) malloc(dwSize); memset(pwf, 0, dwSize); pwf->cbSize = LOWORD(dwSize) - sizeof(WAVEFORMATEX); pwf->wFormatTag = pdi->wFormatTag; memset(&fd, 0, sizeof(fd)); fd.cbStruct = sizeof(fd); fd.pwfx = pwf; fd.cbwfx = dwSize; fd.dwFormatTag = pdi->wFormatTag; mmr = acmFormatEnum(had, &fd, find_format_enum, (DWORD)(VOID*)pdi, 0); free(pwf); acmDriverClose(had, 0); if (pdi->hadid || mmr) { // found it or some error return FALSE; // stop enumerating } return TRUE; // continue enumeration } HACMDRIVERID find_driver(WORD wFormatTag) { FIND_DRIVER_INFO fdi; MMRESULT mmr; fdi.hadid = NULL; fdi.wFormatTag = wFormatTag; mmr = acmDriverEnum(find_driver_enum, (DWORD)(VOID*)&fdi, 0); if (mmr) return NULL; return fdi.hadid; } WAVEFORMATEX* get_driver_format(HACMDRIVERID hadid, WORD wFormatTag) { // open the driver DWORD dwSize = 0; HACMDRIVER had = NULL; WAVEFORMATEX* pwf = NULL; ACMFORMATDETAILS fd; MMRESULT mmr = acmDriverOpen(&had, hadid, 0); FIND_DRIVER_INFO fdi; if (mmr) { printf("acmDriverOpen failed\n"); return NULL; } // allocate a structure for the info mmr = acmMetrics((HACMOBJ)had, ACM_METRIC_MAX_SIZE_FORMAT, &dwSize); if (dwSize < sizeof(WAVEFORMATEX)) dwSize = sizeof(WAVEFORMATEX); // for MS-PCM pwf = (WAVEFORMATEX*) malloc(dwSize); memset(pwf, 0, dwSize); pwf->cbSize = LOWORD(dwSize) - sizeof(WAVEFORMATEX); pwf->wFormatTag = wFormatTag; memset(&fd, 0, sizeof(fd)); fd.cbStruct = sizeof(fd); fd.pwfx = pwf; fd.cbwfx = dwSize; fd.dwFormatTag = wFormatTag; // set up a struct to control the enumeration fdi.hadid = NULL; fdi.wFormatTag = wFormatTag; mmr = acmFormatEnum(had, &fd, find_format_enum2, (DWORD)(VOID*)&fdi, 0); acmDriverClose(had, 0); if ((fdi.hadid == NULL) || mmr) { printf("acmFormatEnum failed\n"); free(pwf); return NULL; } return pwf; } int convert(HACMDRIVERID hadid,WORD wFormatTag) { HACMDRIVER had = NULL; HACMSTREAM hstr = NULL; MMRESULT mmr; // First we create a wave that might have been just recorded. // The format is 11.025 kHz, 8 bit mono PCM which is a recording // format available on all machines. // Our sample wave will be 1 second long and will be a sine wave // of 1kHz, which is exactly 1,000 cycles. WAVEFORMATEX wfSrc; memset(&wfSrc, 0, sizeof(wfSrc)); wfSrc.cbSize = 0; wfSrc.wFormatTag = WAVE_FORMAT_PCM; // PCM wfSrc.nChannels = 1; // Mono wfSrc.nSamplesPerSec = 11025; // 11.025 kHz wfSrc.wBitsPerSample = 8; // 8 bit wfSrc.nBlockAlign = wfSrc.nChannels * wfSrc.wBitsPerSample / 8; wfSrc.nAvgBytesPerSec = wfSrc.nSamplesPerSec * wfSrc.nBlockAlign; DWORD dwSrcSamples = wfSrc.nSamplesPerSec; BYTE* pSrcData = new BYTE [dwSrcSamples]; // 1 second duration BYTE* pData = pSrcData; double f = 1000.0; double pi = 4.0 * atan(1.0); double w = 2.0 * pi * f; for (DWORD dw = 0; dw < dwSrcSamples; dw++) { double t = (double) dw / (double) wfSrc.nSamplesPerSec; *pData++ = 128 + (BYTE)(127.0 * sin(w * t)); } // Get the details of the format. // Note: this is just the first of one or more possible formats for the given tag. WAVEFORMATEX* pwfDrv = get_driver_format(hadid, wFormatTag); if (pwfDrv == NULL) { printf("Error getting format info\n"); return -1; } printf("Driver format: %u bits, %lu samples per second\n", pwfDrv->wBitsPerSample, pwfDrv->nSamplesPerSec); // Get a PCM format tag the driver supports. // Note: we just pick the first supported PCM format which might not really // be the best choice. WAVEFORMATEX* pwfPCM = get_driver_format(hadid, wFormatTag); if (pwfPCM == NULL) { printf("Error getting PCM format info\n"); return -1; } printf("PCM format: %u bits, %lu samples per second\n", pwfPCM->wBitsPerSample, pwfPCM->nSamplesPerSec); // First step ///////////////////////////////////////////////////////////////////////////// // Convert the source wave to the PCM format supported by the CODEC. // We use any driver that can do the PCM to PCM conversion. //HACMSTREAM hstr = NULL; mmr = acmStreamOpen(&hstr, NULL, // Any driver &wfSrc, // Source format pwfPCM, // Destination format NULL, // No filter NULL, // No callback 0, // Instance data (not used) ACM_STREAMOPENF_NONREALTIME); // flags if (mmr) { printf("Failed to open a stream to do PCM to PCM conversion\n"); return -1; } // Allocate a buffer for the result of the conversion. DWORD dwSrcBytes = dwSrcSamples * wfSrc.wBitsPerSample / 8; DWORD dwDst1Samples = dwSrcSamples * pwfPCM->nSamplesPerSec / wfSrc.nSamplesPerSec; DWORD dwDst1Bytes = dwDst1Samples * pwfPCM->wBitsPerSample / 8; BYTE* pDst1Data = new BYTE [dwDst1Bytes]; // Fill in the conversion info. ACMSTREAMHEADER strhdr; memset(&strhdr, 0, sizeof(strhdr)); strhdr.cbStruct = sizeof(strhdr); strhdr.pbSrc = pSrcData; // The source data to convert strhdr.cbSrcLength = dwSrcBytes; strhdr.pbDst = pDst1Data; strhdr.cbDstLength = dwDst1Bytes; mmr = acmStreamPrepareHeader(hstr, &strhdr, 0); printf("Converting to intermediate PCM format...\n"); mmr = acmStreamConvert(hstr, &strhdr, 0); if (mmr) { printf("Failed to do PCM to PCM conversion\n"); return -1; } printf("Intermediate Converted OK\n"); // Close the stream. acmStreamClose(hstr, 0); //Final step /////////////////////////////////////////////////////////////////////////////////// // Convert the intermediate PCM format to the final format. // Open the conversion stream. // Note the use of the ACM_STREAMOPENF_NONREALTIME flag. Without this // some software compressors will report error 512 - not possible. hstr = NULL; mmr = acmStreamOpen(&hstr, NULL, // had, // Driver handle pwfPCM, // Source format pwfDrv, // Destination format NULL, // No filter NULL, // No callback 0, // Instance data (not used) ACM_STREAMOPENF_NONREALTIME ); // Flags if (mmr) { printf("Failed to open a stream to do PCM to driver format conversion\n"); return -1; } // Allocate a buffer for the result of the conversion. // Compute the output buffer size based on the average byte rate // and add a bit for randomness. // The IMA_ADPCM driver fails the conversion without this extra space. DWORD dwDst2Bytes = pwfDrv->nAvgBytesPerSec * dwDst1Samples / pwfPCM->nSamplesPerSec; dwDst2Bytes = dwDst2Bytes * 3 / 2; // add a little room BYTE* pDst2Data = new BYTE [dwDst2Bytes]; // Fill in the conversion info. ACMSTREAMHEADER strhdr2; memset(&strhdr2, 0, sizeof(strhdr2)); strhdr2.cbStruct = sizeof(strhdr2); strhdr2.pbSrc = pDst1Data; // the source data to convert strhdr2.cbSrcLength = dwDst1Bytes; strhdr2.pbDst = pDst2Data; strhdr2.cbDstLength = dwDst2Bytes; // Prep the header. mmr = acmStreamPrepareHeader(hstr, &strhdr2, 0); // Convert the data. printf("Converting to final format...\n"); mmr = acmStreamConvert(hstr, &strhdr2, 0); if (mmr) { printf("Failed to do PCM to driver format conversion\n"); return -1; } printf("Final Step Converted OK\n"); // Close the stream and driver. mmr = acmStreamClose(hstr, 0); mmr = acmDriverClose(had, 0); // Show the conversion stats. printf("Source wave had %lu bytes\n", dwSrcBytes); printf("Converted wave has %lu bytes\n", strhdr2.cbDstLengthUsed); printf("Compression ratio is %f\n", (double) dwSrcBytes / (double) strhdr2.cbDstLengthUsed); return 0; } int main(void) { WORD wFormatTag = WAVE_FORMAT_PCM; HACMDRIVERID hadid = find_driver(wFormatTag); if (hadid == NULL) { printf("No driver found\n"); return -1; } else { printf("Driver found (hadid: %4.4lXH)\n", hadid); return( convert(hadid,wFormatTag)); } }

Hi, BobS0327, thank you very much for your help, I appreciate very much.

I am trying now on my software and will tell you how I am going.

Hi, BobS0327, sorry, again it's me.

Sorry to disturb, May I ask?

I was confused with the acm driver and as a newbie, I really coulndt implement it without any bug after finding the driver and doing the two conversions. I just want to call the third-party software.exe to help me do the compression and decompression part. Do I need to call the dll? Or, Can I just call the .exe from my software?

Sorry for causing any confusion, I was not clear with dll before I put this thread, after I read the pdf about dll, I think that maybe I dont need to call dll but just call the exe.

Please forgive me, I apologized for the trouble caused by me.

Do you think it is possible to call any CODEC software exe from my software? Which one is easier for a newbie like me?

But, I dont know how can I do so, do you mind to give me some guidance? Please, Please forgive me for my ignorance. I try my best in doing it. Hope you can teach me some. Please.

Yes, it is easy to call an EXE from your program (no intermediate DLL is required).

There are a number of audio compression formats you can use, but for your purpose I suggest you consider Speex. It is a free open source format, with command line tools, and is designed specifically for speech.

- Download Speex here. You want the Windows binaries.
- You can find examples of the encoding quality here.
- The command line options can be found here. The simplest command line is: speexenc input.wav output.spx

Once you have got the command line working, you can ask back here about integrating it into to your program.

The things you'll need to know when calling the command line from your program:
- The location of the input file. (ie. Where did your program put the wave file?)
- The destination path for the output file. (You can ask the user).

Quote:

Originally Posted by anonytmouse

Yes, it is easy to call an EXE from your program (no intermediate DLL is required).

There are a number of audio compression formats you can use, but for your purpose I suggest you consider Speex. It is a free open source format, with command line tools, and is designed specifically for speech.

- Download Speex here. You want the Windows binaries.
- You can find examples of the encoding quality here.
- The command line options can be found here. The simplest command line is: speexenc input.wav output.spx

Once you have got the command line working, you can ask back here about integrating it into to your program.

Hi, Anonytmouse, thank you very much for your kind post.

I will study in detail and try to implement it in my own project and will tell you how I am going.

I am so touched and you and those in this forum are willing to give me some guidance as I am totally down for that past few days, thanks for telling me. I will do my best.

Hi, Anonytmouse, thanks for your post, appreciate.

I have read the manual pdf file but I still dont know where can I write any command line. I run the exe but it disappeared in blink and I couldnt manage to write any command line on it. Therefore, I cant test whether the command line works for me or not.

I have listened to the examples of male and female for the encoding quality. It is good enough for our application.

Please forgive me if I did any mistake.

To run the exe file,
- Go to Start -> Run...
- At the prompt, type "command" which will open an MS DOS command prompt.
- type "cd" and type the directory the .exe is in
- At the prompt, type the exe's name, followed by the parameters you want. Parameters are usually separated by spaces.
- Press Enter. Yay.

Quote:

Originally Posted by citizen

To run the exe file,
- Go to Start -> Run...
- At the prompt, type "command" which will open an MS DOS command prompt.
- type "cd" and type the directory the .exe is in
- At the prompt, type the exe's name, followed by the parameters you want. Parameters are usually separated by spaces.
- Press Enter. Yay.

Sorry, please forgive me, I still could not run the exe file, sorry, please forgive me.
I attached the file as I could not figure out where I did wrong.

Run "cmd" instead of "command" and then type:

Code:

cd "D:\Program Files\Speex"

This should get you to the correct directory where you can try out command lines.

Quote:

Originally Posted by anonytmouse

Run "cmd" instead of "command" and then type:

Code:

cd "D:\Program Files\Speex"

This should get you to the correct directory where you can try out command lines.

Hi, Anonytmouse, thank you for your post. I am now manage to go in the correct directory and will try out the command lines. Thanks.

Hi, I have tried to type "speexenc -w wave file 1c.wav wave file 1c.spx" but nothing happen.

From my understanding of the command lines in the web, there are many options, right? I f I need to use more than one, should I implement it one by one or together?

What is expected to be happened if I get the command line functions correctly?

You mean I have to test one option by one option? Sorry, I know I am slow in learning but I try my best to do it, please forgive me.

You need to use quotes around file names (which my example should have included). Try this command line:

Code:

speexenc "wave file 1c.wav" "wave file 1c.spx"

and this command line for decompression:

Code:

speexdec "wave file 1c.spx" "decoded wave file 1c.wav"

I don't think you'll need to use any options, but if so, they go before the file names:

Code:

speexenc -w "wave file 1c.wav" "wave file 1c.spx"

You can use multiple options:

Code:

speexenc -V -w "wave file 1c.wav" "wave file 1c.spx"

If it works, you will get a message similar to:

Code:

Encoding 8000 Hz audio using narrowband mode (mono)

and the output file will apear in the directory.

Hi, Anonytmouse, thank you so much, I have managed to use the command lines correctly. The program converted wave file to mp3 and vice versa successfully. Thanks so much.

How could I call the encode and decode function from my software itself?

May I ask? Is it possible to directly convert the wave to mp3 when the children click the button "save"? I worried that the small children dont know how to do this and that. We hope to make it as simple as possible. so that they are motivated to use this software.

Hi, Could you tell me how to integrate the speex into my software? How to call the speex from my software? Please help, please. I will try my best, please

You may want to try something like:

Code:

STARTUPINFO si = {0}; PROCESS_INFORMATION pi; si.cb = sizeof(STARTUPINFO); CreateProcess("speex",NULL,NULL,NULL,FALSE,0,NULL,NULL,&si,&pi);

I created a function for you that will call speexenc. It needs to be pasted in your source code above the save function.

Code:

/* * Helper function that finds the last instance of a character in a string. */ LPTSTR FindLastOf(LPCTSTR haystack, TCHAR needle) { int i = lstrlen(haystack) - 1; while (i > 0) { if (haystack[i] == needle) return (LPTSTR) &haystack[i]; i--; } return (LPTSTR) &haystack[0]; } /* * Function to call speexenc. * First argument is the location of the .wav file. eg. "C:\\Temp\\wave file.wav" * Second argument is output directory. No trailing backslash should be used. eg. "A:" */ BOOL SpeexEncode(LPCTSTR szInputFile, LPCTSTR szOutputPath) { STARTUPINFO si = { sizeof(STARTUPINFO) }; PROCESS_INFORMATION pi = { 0 }; TCHAR szCommandLine[MAX_PATH * 4 + 100]; TCHAR szPath[MAX_PATH]; TCHAR szOutputFile[MAX_PATH]; TCHAR* p; /* Get the path of the currently running executable * which is where we expect speexenc to be located. */ GetModuleFileName(NULL, szPath, MAX_PATH); p = FindLastOf(szPath, TEXT('\\')); p[0] = TEXT('\0'); /* Get the input file name (excluding path) so that we can * use the same file name for the output as the input. */ p = FindLastOf(szInputFile, TEXT('\\')); lstrcpy(szOutputFile, p + 1); /* Change extension from .wav to .spx */ p = FindLastOf(szOutputFile, TEXT('.')); lstrcpy(p, TEXT(".spx")); /* Create command line. */ wsprintf(szCommandLine, TEXT("\"%s\\speexenc\" \"%s\" \"%s\\%s\""), szPath, szInputFile, szOutputPath, szOutputFile); /* Execute command line. */ CreateProcess(NULL, szCommandLine, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi); /* Uncomment this line, if you want to pause here while the command completes. */ // WaitForSingleObject(pi.hProcess, INFINITE); /* Uncomment this line for debugging, it will show the exact command line used. */ // MessageBox(NULL, szCommandLine, NULL, 0); /* Cleanup. */ CloseHandle(pi.hThread); CloseHandle(pi.hProcess); return TRUE; }

You then need to call this function from your save function. It takes two arguments:
- The first is the location of the input wave file. That is, the path where the program has saved the wave recording.
- The second is the output directory. This may be a constant such as "A:" or a location provided by the user.

It is a impossible to provide the exact details of the call without seeing the save function code. If you can't work it out and it is possible, you could post the save function code, or attach the entire project.

Hi, Anonytmouse, thank you for your reply.

I have tried to put the codes at the location But I have two compile errors, I will search if I could fix it.

error C2601: 'FindLastOf' : local function definitions are illegal
error C2601: 'SpeexEncode' : local function definitions are illegal

You're trying to put them inside another function which is illegal. You need to paste them outside any function.

Hi, I think I must put the codes after the button "save wave", isnt it?

Code:

void CSpeechDlg::OnSaveWave() { // TODO: Add your control notification handler code here savebuffer.save(); }

I have tried to put it in another location but the problem still there.
I have attached it.

Hi, I think I should attache the cpp file without adding the speex codes .

This is the original cpp file without adding any codes of speex purpsoe.

Ok, replace the entire savebuffer.cpp file contents with this (you have backed everything up haven't you?). The changes I've made are highlighted in red.

Code:

#include "stdafx.h" #include "savebuffer.h" #include "wave.h" /* class CSaveBuffer : public CObject { public: CSaveBuffer(); virtual ~CSaveBuffer(); void add(int techno,int testno,char *data); void save(); void clear(); private: bufflist buff; }; */ CSaveBuffer::CSaveBuffer() { } LPTSTR FindLastOf(LPCTSTR haystack, TCHAR needle) { int i = lstrlen(haystack) - 1; while (i > 0) { if (haystack[i] == needle) return (LPTSTR) &haystack[i]; i--; } return (LPTSTR) &haystack[0]; } BOOL SpeexEncode(LPCTSTR szInputFile, LPCTSTR szOutputFile) { STARTUPINFO si = { sizeof(STARTUPINFO) }; PROCESS_INFORMATION pi = { 0 }; TCHAR szCommandLine[MAX_PATH * 4 + 100]; TCHAR szPath[MAX_PATH]; TCHAR* p; /* Get the path of the currently running executable * which is where we expect speexenc to be located. */ GetModuleFileName(NULL, szPath, MAX_PATH); p = FindLastOf(szPath, TEXT('\\')); p[0] = TEXT('\0'); /* Create command line. */ wsprintf(szCommandLine, TEXT("\"%s\\speexenc\" \"%s\" \"%s\""), szPath, szInputFile, szOutputFile); /* Execute command line. */ CreateProcess(NULL, szCommandLine, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi); /* Uncomment this line, if you want to pause here while the command completes. */ // WaitForSingleObject(pi.hProcess, INFINITE); /* Uncomment this line for debugging, it will show the exact command line used. */ // MessageBox(NULL, szCommandLine, NULL, 0); /* Cleanup. */ CloseHandle(pi.hThread); CloseHandle(pi.hProcess); return 0; } void CSaveBuffer::save() { CWave wave; wave.BuildFormat(1,16000,16); wave.m_buffer.SetNumSamples(16000*6,2); bufflist::iterator i; //free the memory for (i=buff.begin();i!=buff.end();i++) { char filename[100]; char temp[10]; itoa(i->techno,temp,10); strcpy(filename,temp); strncat(filename,"-",1); itoa(i->testno,temp,10); strncat(filename,temp,strlen(temp)); strncat(filename,"-",1); itoa(i->count,temp,10); strncat(filename,temp,strlen(temp)); strncat(filename,".spx",4); BOOL flag=TRUE; wave.SetBuffer(i->buf,16000*6,TRUE); while (flag) { CFileDialog savefile(FALSE,NULL,filename,OFN_OVERWRITEPROMPT,"Speech File (*.spx)|*.spx|"); if (savefile.DoModal()==IDOK) { TCHAR szWavePath[MAX_PATH]; /* Create a temporary path for the wave file. */ GetTempPath(MAX_PATH, szWavePath); lstrcat(szWavePath, TEXT("wave file.wav")); /* Save the wave file to temporary location. */ try { wave.Save(szWavePath); break; } catch (...) { } /* Compress with Speex to the final save location selected by the user. */ SpeexEncode(szWavePath, savefile.GetPathName()); } else { break; //don't want to save this } } //CFileDialog savefile(FALSE, } } void CSaveBuffer::clear() { bufflist::iterator i; //free the memory for (i=buff.begin();i!=buff.end();i++) { free(i->buf); } //free the list buff.clear(); } CSaveBuffer::~CSaveBuffer() { bufflist::iterator i; //free the memory for (i=buff.begin();i!=buff.end();i++) { free(i->buf); } //free the list buff.clear(); } int CSaveBuffer::add(int techno,int testno,char *data) { bufflist::iterator i; int count=1; //get the count for (i=buff.begin();i!=buff.end();i++) { if ((i->techno==techno) && (i->testno==testno)) { count=i->count+1; } } buffer_type temp; temp.buf=malloc(16000*2*6); if (temp.buf==NULL) { return -1; } memcpy(temp.buf,data,16000*2*6); temp.count=count; temp.techno=techno; temp.testno=testno; buff.insert(buff.end(),temp); return 0; }

Hi, Anonytmouse, thank you very much for your reply, appreciate.

Yes, I have back up.

I have tried to execute the software and after I click button 'Save Wave", the software prompts me to save .spx file but I could not find any spx file in the location I choose to save. I tried indifferent locations or directory, the result is still the same.

I have put the speexenc.exe and speexdec.exe on the same folder with project debug folder.

I wonder where I did wrong, please forgive me, I will try again

OK, time for a little debugging. Uncomment this line (that is, remove the two "//" at the start of the line):

Code:

// MessageBox(NULL, szCommandLine, NULL, 0);

This will make a popup appear telling you the exact command line used. You can then make sure speexenc is in the correct position and the input file exists. If you like, you can copy the command line (by pressing CTRL+C after clicking on the message box) and paste it here.

Hi, Anonytmouse, thank you for your post.

I have uncommented the above line but I still couldnt get any popup about the command line

Try adding a message box here:

Code:

MessageBox(NULL, savefile.GetPathName(), szWavePath, 0); /* Compress with Speex to the final save location selected by the user. */ SpeexEncode(szWavePath, savefile.GetPathName());

IGNORE THIS POST. SEE NEXT POST.

Hi, Anonytmouse, thanks for your post.

After I added the above lines, I get 4 compile errors.

error C2065: 'savefile' : undeclared identifier
error C2228: left of '.GetPathName' must have class/struct/union type
error C2065: 'szWavePath' : undeclared identifier
error C2228: left of '.GetPathName' must have class/struct/union type
Error executing cl.exe.

Speech.exe - 4 error(s), 0 warning(s)

I've spotted the problem.

Replace the red line:

Code:

wave.Save(szWavePath); break;

with:

Code:

flag = FALSE;

Hi, Anonytmouse, I have add flag =False and the software is error free.
After I executed, I still cant see any spx file in the location I saved

Hi, Anonytmouse, thanks for your post.

Please forgive me for being not clever enough.

I wonder where I did wrong...

What I have done is I added the speexenc.exe and sppexdec.exe at the folder of debug and I record, save wave, but no file is saved

Well you should be getting the popup with the command line now as mentioned in my "OK, time for a little debugging." post.

Hi, Anonytmouse, thank you very much for your post.

What I have done is uncomment the MessageBox(...) and replaced the 'break' with 'flag=FALSE".

And I have executed the software, I still cant get the popup.

Hi, Anonytmouse, I have get the popup command line now.

Sorry, Please forgive me, it is my mistake forget to delete the 'break' word.

But, after the popup command, I get the error message box as attached

IS it working now? Is the file appearing in A: drive?

If not, you need to confirm that both the speexenc path in the popup is correct and that the input file path is correct (ie. The file "D:\documents and settings\administrator.spa\Local Settings\Temp\wave file.wav" exists).

Hi, Anonytmouse, thank you very much for your reply, appreciate.

I can see the spx file in the A floppy disk but I could only find one wave file in the location D:\documents and settings\administrator.spa\Local Settings\Temp\wave file.wav" instead of the 15 wave files that I recorded

It uses the same file name for recording each wave file (ie. The wave file is overwritten each recording). This alllows you to not have to worry about deleting several temporary wave files at some point. You should be getting all the .spx files. I assume you don't need the original wave files.

Hi, Anonytmouse, thank you very much for your reply, appreciate.

Thanks for your explanation. Do you mean by using Speex, we could not have all the wave files saved in Temp, only can save one wave file? Correct me if I am wrong. It is OK if really cant.

May I ask? Can I do the same thing for decoding part?

Why would you want to save all the temporary wave files? The idea is that they're only temporary and that the actual sound files are transferred in the .spx format on the floppy disk. Of course, you can do anything, but saving all the wave files with different file names means that we have to come up with some complicated scheme to delete them when they are no longer needed.

>> Can I do the same thing for decoding part? <<

What do you mean? For the decoding part, you take all the .spx files are decompress them back to wave files with the speexdec program.

Hi, Anonytmouse, thank you for your reply.

I am sorry, I didnt mean to cause the confuse here, forgive my poor English, I am trying my best to learn it gradually, please dont angry. I am sorry.

OK, I am just asking, Since it cant save the wave files, ther willnot be a problem for children to bring the floppy disk to centre.

As I said in the previous post, the error message box came out, what should I do so that the error message wont come out?

Regarding the decoding part, Can I elaborate a little bit? Originally, the "Play wave" button was designed to function like this: When the child bring the floppy disk back to centre, the therapist will click button "play wave". This button will prompt twice for each click. First prompt is to open wave recorded by therapist's own voice and the second prompt is to open wave recorded by children at home. That's why I am asking Is it possible to implement codes so that the MP3 file can be converted to Wave file when button "Play wave' is clicked?

Thank you for your patience to read my poor English:(

>> As I said in the previous post, the error message box came out, what should I do so that the error message wont come out? <<

Comment out the MessageBox line (Put the two "//" back in front of it).

I've got to log off now, but I can help you with the decoding part tomorrow. It is possible to make the software work as it did before.

Hi, Anonytmouse, thank you very much for your reply.

OK, have a nice day. Thank you

The simplest and most expensive way is to get Sony Sound Forge Studio edition (lite edition) and convert the MP3's to WAV's and vice versa.

Another way to do this is to fire up DirectShow, play the MP3's and read the DSP or query the driver to read the DSP and return the actual values being sent to it. This is what a WAV file is, the pure raw data - most are not compressed at all.

This thread has been resolved via PMs. If anyone is interested, the decode function, which is almost identical to the encode function is reproduced below.

Code:

BOOL SpeexDecode(LPCTSTR szInputFile, LPCTSTR szOutputFile) { STARTUPINFO si = { sizeof(STARTUPINFO) }; PROCESS_INFORMATION pi = { 0 }; TCHAR szCommandLine[MAX_PATH * 4 + 100]; TCHAR szPath[MAX_PATH]; TCHAR* p; /* Get the path of the currently running executable * which is where we expect speexdec to be located. */ GetModuleFileName(NULL, szPath, MAX_PATH); p = FindLastOf(szPath, TEXT('\\')); p[0] = TEXT('\0'); /* Create command line. */ wsprintf(szCommandLine, TEXT("\"%s\\speexdec\" \"%s\" \"%s\""), szPath, szInputFile, szOutputFile); /* Execute command line. */ CreateProcess(NULL, szCommandLine, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi); /* Wait for the command to complete. */ WaitForSingleObject(pi.hProcess, INFINITE); /* Uncomment this line for debugging, it will show the exact command line used. */ // MessageBox(NULL, szCommandLine, NULL, 0); /* Cleanup. */ CloseHandle(pi.hThread); CloseHandle(pi.hProcess); return 0; }