The patch number 10597 was added via js
to http://linuxtv.org/hg/v4l-dvb master development tree.
Kernel patches in this development tree may be modified to be backward
compatible with older kernels. Compatibility modifications will be
removed before inclusion into the mainstream Kernel
If anyone has any objections, please let us know by sending a message to:
Linux Media Mailing List <linux-me...@vger.kernel.org>
------
my 2?
---
dvb-spec/HOWTO-use-the-demux-api | 37 ++++++++++++++++++++++---------
1 file changed, 27 insertions(+), 10 deletions(-)
diff -r bac0c7164572 -r d4426808d23a dvb-spec/HOWTO-use-the-demux-api
--- a/dvb-spec/HOWTO-use-the-demux-api Tue Oct 29 07:35:02 2002 -0300
+++ b/dvb-spec/HOWTO-use-the-demux-api Tue Oct 29 10:09:27 2002 -0300
@@ -3,10 +3,12 @@
What has changed since the old Nokia OST API?
- file naming:
+ device node naming:
- /dev/ost directory is now called /dev/dvb
- each DVB adapter has it's own directory /dev/dvb/adapterX
- - here you'll find a number of frontend devices /dev/dvb/adapterX/dmxY
+ - the devfs devices names are identical to those
+ creatd by the makedev.napi script on non-devfs systems
+ - here you'll find a number of demux devices /dev/dvb/adapterX/dmxY
- driver header directory is located now in /usr/include/linux/dvb/
- we have a linux/dvb/version.h file, this is included by all headers which
don't use the original OST API anymore
@@ -45,7 +47,7 @@ I have set up the frontend and now I wan
I have set up the frontend and now I want to see some video!
What do I have to do?
- When you have an MPEG video decoder on board we can set up the demultiplexer
+ When you have an MPEG video decoder on board you can set up the
demultiplexer
to feed the related PES packets into the MPEG decoder:
#include <linux/dvb/dmx.h>
@@ -69,15 +71,20 @@ What do I have to do?
}
This will unpack the payload from all transport stream packets with
- payload ID <pid> and feed it into the MPEG decoder. When pes_type is set
+ packet ID <pid> and feed it into the MPEG decoder. When pes_type is set
to DMX_PES_VIDEO it will be handled as video data. Other types are
DMX_PES_AUDIO, DMX_PES_TELETEXT, DMX_PES_SUBTITLE which will be fed into
- the corresponding decoders.
-
- Open such a PES filter for each substream you want to decode.
+ the corresponding decoders (if these deocders exist in hardware or firmware).
+ DMX_PES_TELETEXT usually means VBI insertion by the PAL/NTSC encoder for
display
+ on a connected TV set. If you want to avoid sending the data to one of the
+ decoders, use pes_type = DMX_PES_OTHER.
+
+ You must open the demux device once for each PES filter you want to set.
+ E.g. if you want audio and video, you must have two distinct file descriptors
+ for the two filters.
DMX_PES_PCR is used by the decoder to achieve a correct timing syncronisation
- for the partial audio/video/... substreams.
+ between the audio/video/... substreams.
Note that you have to keep the frontend and demux filedescriptor open until
you are not interested in the stream anymore. Old API versions did not shut
@@ -90,10 +97,17 @@ I want to record a stream to disk! How?
Set up a filter for each substream you want to record as above but set
the pesfilter.output field to DMX_OUT_TAP. Then you can use read() calls
- to receive the PES packets.
+ to receive PES data.
When you want to receive transport stream packets use DMX_OUT_TS_TAP and
- read the stream from /dev/dvb/adapter0/dvr0.
+ read the stream from /dev/dvb/adapterX/dvrY. The dvr device gives you
+ a multiplex of all filtered PES data with DMX_OUT_TS_TAP. E.g. if you
+ want to record video and audio, open demuxX twice and set two PEs filters
+ with DMX_OUT_TS_TAP, and open dvrX once to read the TS.
+
+ [ The current API does not allow you to specify you an input/output
+ routing for section filters. So you can't get multiplexed section
+ data from the dvr device. ]
Don't forget to keep all device filedescriptors you use open.
@@ -177,6 +191,9 @@ How to do table id filtering?
Then submit the DMX_SET_FILTER ioctl.
+ The filter comprises 16 bytes covering byte 0 and byte 3..17 in a section,
+ thus excluding bytes 1 and 2 (the length field of a section).
+
-------------------------------------------------------------------------------
What are not-equal filters?
---
Patch is available at:
http://linuxtv.org/hg/v4l-dvb/rev/d4426808d23a7e3f5e8937c50510d2454ef3a78e
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