[directmusic] Re: DMO on DirectSound primary buffer
- From: "James Dooley" <jdooley@xxxxxxxxxxxxx>
- To: <directmusic@xxxxxxxxxxxxx>
- Date: Mon, 21 Jun 2004 12:24:32 -0700
You need to call GetObjectInPath(..., IID_IDirectSoundBuffer8, ...) on
every IDirectMusicSegmentState8 belonging to each performance and
iterate through all sink-in buffers (the DMUS_PATH_BUFFER stage). I
think that will catch both segments using their own audiopath and
segments using the performance's default audiopath. Of course, be sure
to check that your DMO isn't already in the buffer as you'll likely end
up looking at the same audiopath more than once.
-james
P.s. In order to catch all audio from segments you start, you'll need
to pre-create and pre-modify audiopaths that are custom to a segment, as
audio may be rendered before you get access to the
IDirectMusicSegmentState8 object (when the call to PlaySegment[Ex]
returns). Also, you'll need to turn off the DMUS_SEGF_USE_AUDIOPATH
flag in the segment's default resolution flags. Calling PlaySegmentEx
with the DMUS_SEGF_DEFAULT flag where the segment internally has the
DMUS_SEGF_USE_AUDIOPATH flag set will cause the performance to create a
new audiopath and ignore the one passed to PlaySegmentEx.
P.p.s You still won't be able to catch segments that are triggered by
segment trigger tracks or scripts, but you'll at least get everything
from all the segments you start with PlaySegmentEx.
This posting is provided "AS IS" with no warranties, and confers no
rights.=20
-----Original Message-----
From: directmusic-bounce@xxxxxxxxxxxxx
[mailto:directmusic-bounce@xxxxxxxxxxxxx] On Behalf Of Abhijit Patait
Sent: Monday, June 21, 2004 11:58 AM
To: directmusic@xxxxxxxxxxxxx
Subject: [directmusic] Re: DMO on DirectSound primary buffer=20
James
=20
Thanks for your response. One question still remains unanswered.
=20
Let's say that I write an external component to mix WAV data exported by
DMOs in each of the performances. How and where do I insert the WAV
writing DMO in each performance? In other words, how do I obtain the
IDirectSoundBuffer8 interface for each performance on which to call
SetFX(...)? As I said, each of my performances can have multiple
audiopaths. Can I just call GetObjectInPath(...,
IID_IDirectSoundBuffer8, ...) on one of the audiopaths belonging to the
performance? I think this will return the buffer for that particular
audio path, not the one after mixing of all audiopaths.
=20
Thanks
Abhijit
James Dooley <jdooley@xxxxxxxxxxxxx> wrote:
On any current machine and OS, the "primary buffer" you want to use
doesn't actually exist - the mixing of the DirectSound buffers is done
either on the soundcard itself or down at the bottom of the Windows
audio stack in the kernel. In both cases, the only way to get back the
"final mix" is through support on the soundcard for either a digital or
analog loopback connection.
Since you're using multiple performances, the only way I can think of to
get what you want is to have all your WAV writing DMOs send their data
to some external component that mixes them all together and writes out a
single WAV file. Note that synchronizing the inputs from two different
performances may not be possible to do with sample-accurate precision,
but it should be possible to do it "close enough" for you to not notice.
To make the performance run at something other than 22050 Hz, modify the
values in the DMUS_AUDIOPARAMS structure you pass to
IDirectMusicPerformance8::InitAudio (see
http://msdn.microsoft.com/library/default.asp?url=3D3D/library/en-us/dire=
c
t=3D
x
9_c/directX/htm/idirectmusicperformance8initaudio.asp).
-james
P.s. If you only have one performance and are using your own
pre-authored audiopaths exclusively, you could simplify the mixing by
creating a shared "mix-in" buffer that contains your WAV writing DMO,
and insert a Send effect at the end of every other buffer that sends to
this shared "mix-in" buffer. Note that if you don't set the volume of
either all the sending buffers or the shared "mix-in" buffer to silence,
you will hear everything played with twice the amplitude (once from all
the sending buffers, and once from the shared "mix-in" buffer). Oh, and
this all has to be done in DirectMusic Producer's audiopath editor
beforehand, as you can't programmatically insert Send effects.
This posting is provided "AS IS" with no warranties, and confers no
rights.=3D20
-----Original Message-----
From: directmusic-bounce@xxxxxxxxxxxxx
[mailto:directmusic-bounce@xxxxxxxxxxxxx] On Behalf Of Abhijit Patait
Sent: Sunday, June 20, 2004 10:56 PM
To: directmusic@xxxxxxxxxxxxx
Subject: [directmusic] DMO on DirectSound primary buffer=3D20
Conitinuing on my question of exporting the audio from DirectMusic as a
WAV file, I have been successful in creating a DMO that can save the
sound as a WAV file. However (there it comes) there are a last few kinks
that I need to work out.
My application contains multiple performances (actually 2
performances) with each performance possibly containing multiple
audiopaths. Since I want to save the final audio output (whatever comes
out of the speakers) to a WAV file, I assume that I will need to set the
DMO (which writes to the WAV file) on the primary buffer. This is where
I am running into trouble. The IDirectSoundBuffer8::SetFX method (to
activate the DMO) is available only for IDirectSoundBuffer8, and primary
buffers do not support IDirectSoundBuffer8 (they only support
IDirectSoundBuffer). Is there any way to solve this problem?
My application seems to be playing sounds at 22050 Hz sampling
frequency. Is there any way to change it to 44100 Hz (or something
else)?
Thank you in advance...
=3D20
-Abhijit
=3D20
Abhijit Patait wrote:
James
Thank you for valuable hint (looking at the DMO AppWizard - I didn't
know it existed :-). I had looked at the Gargle DMO code, but could not
understand most of it. After reading your suggestion, I generated a
sample application using DMO AppWIzard, and realized that most of the
code is generated by the wizard. It does not seem to be very complicated
to write a DMO. I will try it.
Thanks again
Abhijit
James Dooley wrote:
Writing a DMO isn't as hard as you think - especially with the audio DMO
wizard that ships in the DirectX SDK (which unfortunately only works on
VC 6.0). See:
http://msdn.microsoft.com/library/default.asp?url=3D3D3D/library/en-us/di=
r
e=3D
c
t=3D3D
x
9_c/directX/htm/audioeffectdmowizard.asp
Alternatively, you could start with the Gargle DMO sample, also in the
DX9 SDK (in C++\DirectShow\DMO\GargleDMO).
-james
This posting is provided "AS IS" with no warranties, and confers no
rights.
-----Original Message-----
From: directmusic-bounce@xxxxxxxxxxxxx
[mailto:directmusic-bounce@xxxxxxxxxxxxx] On Behalf Of Abhijit Patait
Sent: Thursday, June 17, 2004 2:44 PM
To: directmusic@xxxxxxxxxxxxx
Subject: [directmusic] Re: Exporting Audio using DirectMusic API
Thanks for your answers. Looks like I will dig deeper into writing the
DMO myself (which seems to be a big task due to sharp learning curve on
DirectShow). Per James' suggestion, I have also written an email to
directx@xxxxxxxxxxxxx and requested them to publish the interface for
the FileOutput DMO (even though I have very little hope from that
avenue) :-)
=3D3D20
-Abhijit
James Dooley wrote:
No - there is currently no published API for that DMO. However, you can
always email directx@xxxxxxxxxxxxx ask ask them to publish the interface
for it.
-james
This posting is provided "AS IS" with no warranties, and confers no
rights.=3D3D3D3D20
-----Original Message-----
From: directmusic-bounce@xxxxxxxxxxxxx
[mailto:directmusic-bounce@xxxxxxxxxxxxx] On Behalf Of Scott Morgan
Sent: Wednesday, June 16, 2004 11:09 AM
To: directmusic@xxxxxxxxxxxxx
Subject: [directmusic] Re: Exporting Audio using DirectMusic API
What about the file output DMO that shows up in Producer? Can he use
that?
-Scott Morgan
http://morganstudios.com
-----Original Message-----
From: directmusic-bounce@xxxxxxxxxxxxx
[mailto:directmusic-bounce@xxxxxxxxxxxxx]On Behalf Of James Dooley
Sent: Tuesday, June 15, 2004 5:02 PM
To: directmusic@xxxxxxxxxxxxx
Subject: [directmusic] Re: Exporting Audio using DirectMusic API
You are correct that this is not a trivial task. I can think of two ways
to do this:
1) Using DirectMusic 8 or 9 interfaces, create a DMO that writes the
data it sees to a WAV file (or passes it on to another component that
writes the WAV file). Then, either author a custom audiopath using your
DMO in DirectMusic Producer, or use IDirectSoundBuffer8::SetFX to put
your DMO in a DirectSound buffer directly.
2) Initialize the performance with IDirectMusicPerformance::Init() to
use the DirectMusic 7.0 synthesizer and enable use of the
IDirectMusicSynthSink interface.
See
http://msdn.microsoft.com/library/default.asp?url=3D3D3D3D3D/library/en-u=
s
/=3D
d
i=3D3D
r
e=3D3D3D
c
t=3D3D3D3D
x
9_c/directX/htm/idirectmusicsynthsinkinterface.asp?frame=3D3D3D3D3Dtrue
Note that the comment "To capture output from the later version of the
synthesizer, you must implement a DMO on the primary buffer" is wrong.
The primary buffer isn't used with WDM devices, so you need to implement
a DMO on every buffer in your audiopath (or implement your DMO on a
mixin buffer, have every other buffer send to that one mixin buffer, and
mute all the other buffers).
-james
This posting is provided "AS IS" with no warranties, and confers no
rights.=3D3D3D3D20
-----Original Message-----
From: directmusic-bounce@xxxxxxxxxxxxx
[mailto:directmusic-bounce@xxxxxxxxxxxxx] On Behalf Of Abhijit Patait
Sent: Tuesday, June 15, 2004 4:44 PM
To: directmusic@xxxxxxxxxxxxx
Subject: [directmusic] Re: Exporting Audio using DirectMusic API
Since I haven't received any response on this, I assume that this is not
a trivial task. However, has someone on this group done anything similar
before (may be without using DirectX/DirectMusic)? If so, what should I
look for? I wandered (literally) through the DirectX documentation on
MSDN and elsewhere but could not find any useful information. All I can
guess is I have to use DirectSound, IDirectSoundBuffer8,
IDrectMusicSynth or some combination of the above.
=3D3D3D3D20
Any pointers will be greatly useful.
=3D3D3D3D20
Thank you
Abhijit
Abhijit Patait wrote:
With a lot of help from people on this list, I have finally gotten my
little sequencer application to make sounds as I want it to, using
custom DLS instruments.
My next objective is to export the audio as a WAV file from my sequencer
application. I can easily create a MIDI file. But is there an API to
access the samples generated by the synthesizer and save them as WAV
file (especially since the instruments I am using are from custom DLS)?
Thanks again for you help.
Abhijit
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