DSP video (2009-08)

From AlwaysInnovating

This page gives information about DSP for an old software build (2009-08.x). Please upgrade to 2010-01.a on which DSP is working much better, and visit this page. We keep this page for history purpose only.

OMAP3530 includes the TI DSP co-processor which can decode MPEG2/4 video. There are two architectures: DSP Bridge and DSP link.

Contents 1 DSP Bridge 2 DSP Link 2.1 Note 3 Remarks

DSP Bridge

For DSP bridge, you need to update etc/init.d/dspbridge-init (release 2009-08.[a-b]) with the following code:

#!/bin/sh

case "$1" in
  start)
	echo "Starting dspbridge"

	mkdir -p /tmp/dsp
	cp /lib/dsp/* /tmp/dsp
	cp /usr/bin/test-dsp/*.dll64P /tmp/dsp
	cp /usr/bin/test-dsp/*.dof64P /tmp/dsp

	modprobe bridgedriver base_img=/tmp/dsp/baseimage.dof
	modprobe dspbridge
	sleep 1

	# Fix permissions
	chmod 660 /dev/DspBridge
	chown root:video /dev/DspBridge

	/usr/bin/dynreg.out -r /tmp/dsp/dctn_dyn.dll64P
	/usr/bin/dynreg.out -r /tmp/dsp/mp4vdec_sn.dll64P
	/usr/bin/dynreg.out -r /tmp/dsp/mpeg4aacdec_sn.dll64P
	/usr/bin/dynreg.out -r /tmp/dsp/postprocessor.dll64P 
	/usr/bin/dynreg.out -r /tmp/dsp/ringio.dll64P       
	/usr/bin/dynreg.out -r /tmp/dsp/usn.dll64P   
	/usr/bin/dynreg.out -r /tmp/dsp/vpp_sn.dll64P
	;;
  stop)
	echo "Stopping dspbridge"
	rmmod bridgedriver
	rmmod dspbridge
	;;
esac

Then you need to update the libomxil-ti package and start the service:

sudo -s

ipkg -force-depends remove libomxil-ti

ipkg install libomxil-ti_0.0+r1+gitr18b2794567728f3dfa6ec93f7e3b9a74f3549390-r1.1_armv7a.ipk

/etc/init.d/dspbridge-init start

exit

/usr/bin/omxregister-bellagio

You can test the DSP:

/usr/bin/dynreg.out -r /tmp/dsp/pingdyn_3430.dll64P

/usr/bin/test-dsp/ping.out

To play a video, try the following:

LD_PRELOAD=/lib/libbridge.so totem /home/ai/Videos/air.avi

DSP Link

You first need to create /etc/init.d/setup-dsplink.sh

# Default Memory Map
#
# Start Addr    Size    Description
# -------------------------------------------
# 0x80000000   227 MB   Linux
# 0x8E300000    16 MB   CMEM
# 0x8F300000     4 KB   DSPLINK (RESET)
# 0x8F301000     1 MB   DSPLINK (MEM)
# 0x8F400000     9 MB   DDRALGHEAP
# 0x8FD00000     3 MB   DDR2 (BIOS, Codecs, Applications)


modprobe cmemk phys_start=0x8e300000 phys_end=0x8f300000 pools=20x4096,8x131072,4x829440,1x5250000,1x1429440,1x256000

chgrp video /dev/cmem

modprobe dsplinkk
rm -f /dev/dsplink
mknod /dev/dsplink c `awk "\\$2==\"dsplink\" {print \\$1}" /proc/devices` 0

modprobe lpm_omap3530

Then you need to run the script:

sudo -s

/etc/init.d/setup-dsplink.sh

echo -e "\n* - rtprio 0\n@video - rtprio 99\n" >> /etc/security/limits.conf

exit

To play a video, use the following:

gst-launch -v filesrc location=/home/ai/Videos/air.avi ! avidemux name=demux demux.video_00 ! TIViddec2 ! omapfbsink

Note

The DSP Link also requires that you reserve a section of RAM for it that the Linux Kernel is not allowed to use. To do this you can specify "mem=227M" in the bootargs environment variable. I have worked through the steps to rebuild all of the DSP Link and associated software using OpenEmbedded and posted the info here: http://lists.linuxtogo.org/pipermail/openembedded-devel/2009-September/013553.html

With that configuration, I use mem=227M in my bootargs (use fw_printenv to examine and fw_setenv to modify) and the resulting code works well. Also note, the gstreamer-ti plugin that's required tries to create threads with RealTime scheduling priority. By default only root is allowed to do this, so the gst-launch examples above will only work when run as root. The Video codecs try to run with maximum(SCHED_FIFO) priority, and the Audio codecs run with maximum(SCHED_FIFO)-1. (That's 99 and 98, respectively on Linux.) You can also configure the privileges for non-root users by adding this to /etc/security/limits.conf:

*        -       rtprio     0
@video   -       rtprio     99

That will allow all users in the video group (see /etc/group) to raise their scheduling priority. The default user ai is in this group; you will probably have to logout and login again for this change to take effect.

Remarks

To play a video without DSP:

gst-launch filesrc location="/home/ai/Videos/air.avi" ! avidemux name=demux demux.audio_00 ! ffdec_mp3 ! alsasink

gst-launch filesrc location=/home/ai/Videos/air.avi ! avidemux name=demux demux.video_00 ! ffdec_mpeg4 ! ffmpegcolorspace ! omapfbsink

As a reminder, on a standard x86 Linux PC, you can run the following:

gst-launch filesrc location="/home/ai/Videos/air.avi" ! avidemux name=demux demux.audio_00 ! queue ! ffdec_mp3 ! audioconvert ! alsasink demux.video_00 ! queue ! ffdec_mpeg4 ! omapfbsink