DSP video (2009-08)

From AlwaysInnovating

This page gives information about DSP for an old software build (2009-08.x). Please upgrade to the latest release 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