Print Page - Playing in-memory wave files.

Title: Playing in-memory wave files.
Post by: Dark Schneider on December 20, 2004, 05:36:11 AM

I'm making a program to view/extract data from some archive file format and I'm encountering some problems.

How can I play a waveform audio file directly from memory buffer?
Can I do it if that buffer really is a portion of a memory-mapped file?

I only used "PlaySound" function but it's not acceptable this time because I have to write a temp file for it.

Please help me, some example codes will be appreciated. ::)

Title: Re: Playing in-memory wave files.
Post by: donkey on December 20, 2004, 06:11:51 AM

This will play a sound directly from memory (GoAsm format):

Code Select

invoke CreateFile,"C:\WinNT\Media\ir_begin.wav",GENERIC_READ,NULL,NULL,OPEN_EXISTING,NULL,NULL
mov [hFile],eax
invoke GetFileSize,[hFile],offset cbFile
mov [cbFile],eax
invoke GlobalAlloc,GMEM_ZEROINIT,eax
mov [pBuffer],eax
invoke ReadFile,[hFile],[pBuffer],[cbFile],offset cbRead,NULL
invoke CloseHandle,[hFile]
invoke PlaySound,[pBuffer],NULL,SND_MEMORY

From resources:

RC file

Code Select

3000 WAVE DISCARDABLE "ir_begin.wav"

Code

Code Select

invoke PlaySound,3000,[hInstance],SND_RESOURCE

Title: Re: Playing in-memory wave files.
Post by: donkey on December 21, 2004, 04:09:18 AM

Playing a memory mapped file:

   invoke CreateFile,"ir_begin.wav",GENERIC_READ,NULL,NULL,OPEN_EXISTING,NULL,NULL
   mov [hFile],eax
   or eax,eax
   js >NOFILE

   invoke CreateFileMapping,[hFile],NULL,PAGE_READONLY,0,0,NULL
   mov [hMapFile],eax
   or eax,eax
   jz >NOHANDLE

   invoke MapViewOfFile,[hMapFile],FILE_MAP_READ,0,0,0
   mov [pMapFile],eax
   or eax,eax
   jz >NOPOINTER

   invoke PlaySound,[pMapFile],NULL,SND_MEMORY

   invoke UnmapViewOfFile,[pMapFile]
NOPOINTER:
   invoke CloseHandle,[hMapFile]
NOHANDLE:
   invoke CloseHandle,[hFile]
NOFILE:
   invoke ExitProcess, 0

Title: Re: Playing in-memory wave files.
Post by: Dark Schneider on December 21, 2004, 04:12:04 AM

Thanks, donkey.

Actually, I'm trying to "play" from a big file consists of several wave files chained togather (not compressed).
I used file-mapping to skip allocating memory and filling it with an extracted wave file from that one big file, so I'm not sure how to play it directly from memory buffer but I'll try your method right away.

- - - - - - - - - - - - - - - - - - - - -
I'm not so experienced in Win32 Assembly programming, but it's truly fun and interesting trying to resolve so many problems.

Title: Re: Playing in-memory wave files.
Post by: Dark Schneider on December 27, 2004, 07:13:53 AM

Yes, it works.

The main idea was "SND_MEMORY" flag, I didn't read all related documents before asking.

Then I made a function to display memory status (update every other 2 seconds).

The sound played nicely but the program quickly consumed ALL of physical memory available, the function remarked that the wave file must fit in available memory.

In my case the size of sound file is between 200KB up to 350MB, I can play a few big files before all of physical memory is consumed and some files is just too big to fit in memory!

I tried "waveOutWrite" but the result is even worse, seems I can't use it properly.

The nexe question is:

Is there any way to cleanup memory after the sound file is played using "PlaySound" function?

Title: Re: Playing in-memory wave files.
Post by: Siekmanski on December 27, 2004, 07:43:15 AM

Maybe this is of some use for you:

http://members.home.nl/siekmanski/playsound.zip

It loads portions of a .wav file in a directsound buffer and plays it

you can change this in the source to read in chunks of .wav data in a loop, or all in once...

; Read the wave data into the soundbufffer
invoke mmioRead,hMmio,S_data,Numbytes ;Number of bytes to read from the file.

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General Forums => The Campus => Topic started by: Dark Schneider on December 20, 2004, 05:36:11 AM