Hi,
We are implementing the current linux dvb video and audio devices in
software for a media centre we are building. We are uncertain of the
best way to access the functions provided by the core to implement the
data paths needed.
The first requirement is to support 192 byte transport stream packets
which have the 0x47 as byte 4. This is the format used on Blue Ray
disks. We are currently doing this by hooking into the
dvb_demux.dmx.write function.
The second requirement is to receive payload data from the demux rather
than 188 byte chunks via the write_to_decoder function.
The user will typically set up a pes filter with something like:
PesFilter.input = DMX_IN_DVR;
PesFilter.output = DMX_OUT_DECODER;
PesFilter.pes_type = DMX_PES_VIDEO;
PesFilter.pid = Context->VideoId;
PesFilter.flags = DMX_IMMEDIATE_START;
Result = ioctl (Context->DemuxVideoDevice,
DMX_SET_PES_FILTER, &PesFilter);
The software will be running within the kernel and we would like to be
able to intercept this in such a way that the demuxed pes data can be
read from the various different feeds. Are there any mechanisms which
allow this kind of access. The reason for this is it seems pointless to
demux data that has already been filtered by the dvb-core functions.
Best wishes
Julian Wilson
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