This is a very minimal ASIO sample written in x64 ASM. While the code itself is fairly straightforward, I had significant difficulty in searching for working sample. To write this code, I had to comb through NAudio to get the proper understanding of ASIO.
I hope this code helps others who are searching for similar solution
ASIOSample.zip
Thanks, VCoder :thup:
It builds fine when replacing all
C:\ in build.bat with
\ (my Masm installations are not on drive C:).
However, after mov rcx,[<pAsio>] the rcx register is zero, so it crashes:
00007FF7B2F511B2 <AS | 55 | push rbp | ASIO.asm:161
00007FF7B2F511B3 | 48:8BEC | mov rbp,rsp |
00007FF7B2F511B6 | 48:83EC 10 | sub rsp,10 |
00007FF7B2F511BA | 48:83E4 F0 | and rsp,FFFFFFFFFFFFFFF0 |
00007FF7B2F511BE | 52 | push rdx | rdx:main
00007FF7B2F511BF | 48:83EC 48 | sub rsp,48 |
00007FF7B2F511C3 | 48:8B0D 861E0000 | mov rcx,[<pAsio>] | ASIO.asm:162
00007FF7B2F511CA | 48:8B01 | mov rax,[rcx] | ASIO.asm:163
00007FF7B2F511CD | FF50 38 | call [rax+38] | ASIO.asm:164
00007FF7B2F511D0 | 48:83C4 48 | add rsp,48 |
00007FF7B2F511D4 | 5A | pop rdx | rdx:main
00007FF7B2F511D5 | C9 | leave |
00007FF7B2F511D6 | C3 | ret |
Did you replace this one? This ClsID is for my creative X-fi card. For your card it may be different.
(https://i.postimg.cc/PPLtbWWM/image.png) (https://postimg.cc/PPLtbWWM)
Also if you have VS2022 installed with ASMDude, you can debug line by line.
I have no card installed, so I can't test it, sorry.
Attached a version that is better adapted to a Masm64 SDK installation. It's only 5 files instead of 18 in your original version, making use of lots of elements that come along with the Masm64 SDK anyway. The build.bat is reduced to the following:
@echo off
\masm32\bin64\ml64.exe /Zi /Zd /Zf /FR /Fm /c AsioSample.asm
\masm32\bin64\link.exe /DEBUG /PROFILE /MACHINE:x64 /SUBSYSTEM:WINDOWS /ENTRY:main AsioSample.obj
del *.obj
@echo off
pause
Output:
Microsoft (R) Macro Assembler (x64) Version 14.10.24930.0
Copyright (C) Microsoft Corporation. All rights reserved.
Assembling: AsioSample.asm
ASIO.asm(12) : warning A4014:instructions and initialized data not supported in BSS segments
Microsoft (R) Incremental Linker Version 14.10.24930.0
Copyright (C) Microsoft Corporation. All rights reserved.
There is a warning for ASIOInfo:
pAsio dq ?
ASIOInfo ASIODriverInfo <>
ChannelInfo ASIO_ChannelInfo <>
The problem sits here:
ASIODriverInfo STRUCT
AsioVersion dd 2; ; currently, 2
DriverVersion dd 0; ; driver specific
...That should be:
ASIODriverInfo STRUCT
AsioVersion dd ?; ; currently, 2
DriverVersion dd ?; ; driver specific
...
Note that without correction, the AsioVersion member will be zero, not 2. You need to set it manually.
@jj2007 thanks for the input. Regarding using MASM64 SDK, for me it is more convenient to keep the relevant files within same folder without referencing to other locations. Second, I will be forced to learn about the usage of particular Win32 API and its structures :biggrin: .
Here is a new version which I have updated to run with ASIO4All, so anybody should be able to run ( I assume that CLSID is same for all the ASIO4All installation {232685C6-6548-49D8-846D-4141A3EF7560})
Note: With ASIO4All, the ExitProcess doesn't seems to kill the application. You need to kill it from TaskManager. If anyone figure out the reason, please let me know.