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Hi,
I use Windows Media Format SDK 9.5 to write a ASF Muxer filter, the
filter can receive precompressed video and audio data.
In addition, I have implemented a PCI based AVStream driver as a live
source filter, it can send compressed video and audio data.
The subtype of source filter's video capture pin is "H264", and the
subtype of audio pin is "ADPCM". I use Graphedit to test, and the
connection is as followig:
For capturing file:
(H264 data)
video capture pin --> ASF muxer
audio pin -- /
(ADPCM data)
For rendering file:
WM ASF reader --> h264 decoder --> video render
\--> ADPCM decoder -> sound render device
My question is as below:
The audio pin sends 120 bytes for each packet while capturing.
However, when I render the ASF file, the packet size passing to ADPCM
decoder is only 8 byptes.
I would like the audio packedt size stored in ASF is a multiple of
3, then my ADPCM decoder can decompress the audio data.
Does anyone know which factor will determine the audio packet size
in ASF file? Could I control the packet size by modifying my source
filter or ASF muxer filter?
Thanks a lot!
Best Regards,
Gordon
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