how to capture audio to PCM buffers using DirectShow
Sun, 20 Apr 2008 15:31:00 -0700
Hello,
I apologize for the question if it has been asked before
any help would be appreciated...
I cant find any example of how to capture audio into PCM buffers
where we can treat each buffer at a time (like in live encoding to ogg vorbis)
all examples about capturing to files nothing about buffers
...
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Audio Signal Processing using Directshow(ISampleGrabber) - 2
Wed, 16 Apr 2008 18:01:01 -0700
Hello , I wanted to re-ask my previos question , since I made some progress.
And I want to clear some stuff in my head.
1. BUFFERING "STEREO" STREAMS : I use the code below . Generally 8000
bytes passed to callback function. Since my each sampleis 16bit , that is
about 4000 samples for each call. So I def ...
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Changing Parameters of a DMO which added as filter in Directshow
Wed, 16 Apr 2008 17:53:00 -0700
I added MS ParamEqu filter ( which is a DMO ) into my graph using IDMOWrapper
interface.
I want to manipulate parameters of it ( gain,bandwidth,center freq)
programatically in my code.
When I searched for this , I found IMediaParams Interface (
http://msdn2.microsoft.com/en-us/library/ms785964(VS.85).aspx ...
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PCM to MP3 Audio Compression
Wed, 16 Apr 2008 04:35:10 -0700 (PDT)
I need to create an .mp3 file out of a PCM stream. I will be given
access to chunks of PCM data and need to be able to stream it into the
mp3 file. This needs to work on both Vista and XP.
I have spent some time looking into what is the quickest and easiest
way to do this. I think that it would be possible to ...
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Re: Conversion from WAVE_FORMAT_GSM to WAVE_FORMAT_PCM
Wed, 16 Apr 2008 00:01:36 -0700 (PDT)
On Apr 15, 11:57�am, "Barzo@Google" <dba...@gmail.com> wrote:
<snip>
> How I have to configure the WAVEHDR.dwBufferLength in the player side?
<snip>
I should also have said ...
Use acmStreamSize(), but use it both ways ie find the output buffer
for the input buffer, & then find the input buffer for _that ...
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Re: Conversion from WAVE_FORMAT_GSM to WAVE_FORMAT_PCM
Tue, 15 Apr 2008 23:45:33 -0700 (PDT)
On Apr 15, 11:57�am, "Barzo@Google" <dba...@gmail.com> wrote:
> Hi,
>
> I've a doubt about this convertion.
> In my application I send audio in GSM format over the network and on
> the other side, I read it and I have to convert it into PCM format.
>
> I'm sure that the GSM audio is correct (I have recorded ...
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Audio Equalizer With and Without DirectSound(ParamEq DMO)
Sun, 13 Apr 2008 14:49:00 -0700
Hello
I want to build a multiband (from 60 Hz to 3 kHZ ) audio equalizer using
Directshow and sample grabber.
1. I guess I must build band-pass filters ( I will work with FIR filters) to
equalize sound.
Is there any sample or advice for that task ? For ex. what should number of
taps in my filter be ?
...
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Display 3D Content on 120Hz Cathode Ray Monitor
Fri, 11 Apr 2008 18:21:28 +0200
Hi !
I want to create a DirectShow Plugin that Plays Video in 3D on a 120Hz
Monitor, therefore I bought an old Monitor that is capable of displaying
1024 x 768 with 120Hz. To achieve 3D I thought about using the rs232 serial
port to drive a LCD Shutterglass. I thought about creating a DirectShow
Filter that d ...
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Audio Signal Processing using Directshow(ISampleGrabber)
Wed, 9 Apr 2008 15:16:01 -0700
Hello
I want to build an audio processing application using ISampleGrabber
interface.
1. How can I learn sampling rates of audio streams ? Its callback function
gives me "SampleTime"s and
size of buffers. I guess I can get sampling rate as kbps. By the way after I
get sampling rate as kbps
how can I ...
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WMVA VCM drivers availability?
Tue, 8 Apr 2008 04:41:01 -0700
Hello
I saw on wikipedia that WMVA VfW/VCM driver is also available apart from DMO.
But where it can be downloaded from? Is it part of something bigger?
Is there also VCM version of WVC1 driver available? (and where if so?)
Best regards, Radek Strugalski ...
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