TV Tuner on BB

[Matej]

Hi

I managed to compile latest V4L modules against the kernel version
2.6.28 and 2.6.29.
The guys at V4L made that quite easy.

Now, I am using a mplayer (compiled fwith OpenEmbedded), which uses
NEON optimization for
playing MPEG4 movies. This is the output from MPlayer, when I play a
sample file (only
output I think is important is included):

VIDEO: [DX50] 576x240 24bpp 25.000 fps 818.0 kbps (99.9 kbyte/s)
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffodivx] vfm: ffmpeg (FFmpeg MPEG-4)
==========================================================================
==========================================================================
Forced audio codec: mad
Opening audio decoder: [libmad] libmad mpeg audio decoder
AUDIO: 48000 Hz, 2 ch, s16le, 128.0 kbit/8.33% (ratio: 16000->192000)
Selected audio codec: [mad] afm: libmad (libMAD MPEG layer 1-2-3)
==========================================================================
AO: [oss] 48000Hz 2ch s16le (2 bytes per sample)
VO: [xv] 576x240 => 576x240 Planar YV12

I use top, to see how much CPU utilization I get when playing such
file and that is around 25% for mplayer
and around 3% for XOrg.

Now, when I try to play a TV stream with:
$ mplayer tv://
Playing tv://.
TV file format detected.
Selected driver: v4l2
name: Video 4 Linux 2 input

tvp5150 2-005c: tvp5150am1 detected.
Selected device: Hauppauge WinTV USB 2
Tuner cap: STEREO LANG1 LANG2
Tuner rxs: MONO
Capabilites: video capture tuner audio read/write streaming
supported norms: 0 = NTSC; 1 = NTSC-M; 2 = NTSC-M-JP; 3 = NTSC-M-KR;
4 = NTSC-443; 5 = PAL; 6 = PAL-BG; 7 = PAL-H; ;
inputs: 0 = Television; 1 = S-Video;
Current input: 0
Current format: YUYV
v4l2: current audio mode is : STEREO

==========================================================================
Opening video decoder: [raw] RAW Uncompressed Video
VDec: vo config request - 640 x 480 (preferred colorspace: Packed
YUY2)
VDec: using Packed YUY2 as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
VO: [xv] 640x480 => 640x480 Packed YUY2
Selected video codec: [rawyuy2] vfm: raw (RAW YUY2)
==========================================================================

Again, with top i get mplayer using around 75% CPU utilization and
XOrg takes another 20%!!!

I believe this is due to decoder RAW YUY2 not being optimized for
NEON. Am I right?
What could I do, to optimize this?
Any hints?

Oh, and I managed to get profiler running, and this is what I get when
I run it under gprof:

Flat profile:

Each sample counts as 0.01 seconds.
% cumulative self self total
time seconds seconds calls Ts/call Ts/call name
93.33 0.14 0.14 mirror
6.67 0.15 0.01 demux_open_film
0.00 0.15 0.00 6674 0.00 0.00 control
0.00 0.15 0.00 6652 0.00 0.00 GetTimer
0.00 0.15 0.00 5892 0.00 0.00 mp_msg
0.00 0.15 0.00 5703 0.00 0.00 teletext_control
0.00 0.15 0.00 3800 0.00 0.00 saddf
0.00 0.15 0.00 1901 0.00 0.00 control

So mirror is the function giving us the headaches!

Thanks for any info.

Regards,
Matej