Multi-instance vdec

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Multi-instance vdec

Post by forgetjake »

Hw-accelerated video decode (vdec) of h264 on HC4 works, using:
* Linux staging drivers for v4L2m2m, using ffmpeg and/or mpv
* LibPlayer example apps kplayer and simple_player, from the Hardkernel repo
* c2play, which uses the Libplayer APIs/fw.
Each of the above decodes a single h264 video with very little CPU load.

...anyone have any pointers/advice on multi-instance vdec (simultaneously decoding of multiple streams) ?

I realize this is not supported in mainline v4L2m2m (Maxime Jordan, "Multiple decoding is a very long way unfortunately, because each codec has a different firmware and kernel code for whether it's the single or multi-instance version. And the multi-instance versions are more complex. And then you need to implement vdec scheduling and context switching. So a lot of work overall.").

However, it's supported by the AVE-10 hw, and there's Amlogic driver code for it
* https://irclog.whitequark.org/linux-amlogic/2018-04-02
* https://github.com/gcsuri/aml_dvb-4.9/b ... i/vmh264.c

Has anyone ever seen this work, in any form, on C4/HC4/S905X3... or really any Amlogic SoC? Any breadcrumbs very much appreciated!

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Re: Multi-instance vdec

Post by rooted »

@crashoverride Do you know this is possible with the current implementation or a hack which may allow it?

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Re: Multi-instance vdec

Post by crashoverride »

rooted wrote:
Fri Sep 24, 2021 7:30 am
Do you know this is possible with the current implementation or a hack which may allow it?
While bringing c2play to the C4/N2, one of the tests was to swap out the single use h264 codec for the multi-use version. However, it simply locked up when attempting to use it. It may require more codec memory reservation or have other issue(s).
forgetjake wrote:
Fri Sep 24, 2021 4:08 am
c2play, which uses the Libplayer APIs/fw.
c2play does not use anything from libplayer or libamcodec. It directly uses the codec device driver interfaces.
forgetjake wrote:
Fri Sep 24, 2021 4:08 am
However, it's supported by the AVE-10 hw, and there's Amlogic driver code for it
The "official" driver is here:
https://github.com/hardkernel/linux/tre ... h264_multi

It can be used by disabling the h264 module and using the h264_multi module instead. I do not have any tips, tricks, or examples for using it.

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Re: Multi-instance vdec

Post by rooted »

Thanks for chiming in.

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Re: Multi-instance vdec

Post by forgetjake »

Ditto -- much appreciated!

@crashoveride, thanks for the pointer to the official codecs/driver -- wasn't aware of that repo. (I also just found the buildroot info on the Odroid wiki... tobetter's docker-based build works, after some munging...)

> It can be used by disabling the h264 module and using the h264_multi module instead. I do not have any tips, tricks, or examples for using it.

I'll try that with LibPlayer.
If that doesn't work (i.e., like you found with c2play), any ideas on other players that use the Amlogic codecs that I could try?

Thanks again!

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Re: Multi-instance vdec

Post by crashoverride »

forgetjake wrote:
Sun Sep 26, 2021 2:52 am
any ideas on other players that use the Amlogic codecs that I could try?
The only other player I know of is Kodi.

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Re: Multi-instance vdec

Post by odroid »

Probably kplayer. But, nobody knows if it supports Multi-instance decode or not.
https://wiki.odroid.com/odroid-c4/os_im ... o_playback

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Re: Multi-instance vdec

Post by forgetjake »

Thanks, @odroid
When I use kplayer, it actually loads the multi-instance codec...
From dmesg (see underlined)
...
[ 278.331483] vdec_init, dev_name:ammvdec_h264, vdec_type=VDEC_TYPE_STREAM_PARSER
[ 278.331485] vdec_init set vfm decoder ffffff80113c0000
[ 278.331881] ammvdec_h264_mmu_init tvp = 0x0 mmu_enable 0
[ 278.331885] decoder_bmmu_box_alloc_box, tvp_flags = 0
[ 278.331893] 0: ammvdec_h264_probe mmu_enable 0 double_write_mode 0x0
[ 278.332731] 0: ammvdec_h264 mem-addr=0,buff_offset=cef10000,buf_start=cff00000
[ 278.332847] vdec mux clock is 799999987 Hz
[ 278.332850] vdec1 video changed to 3840 x 2160 60 fps clk->800MHZ
[ 278.332855] H264 sysinfo: 720x480 duration=4003, pts_outside=0
[ 278.332856] sync_outside=0, use_idr_framerate=0, is_used_v4l: 0
[ 278.332900] [LOCAL], the fw (h264_multi) will be loaded.
...

The problem is that opening a second stream always gives errno=16 (EBUSY), which is coming from the attempt to open the single-instance port "/dev/amstream_vbuf".
Changing kplayer / libamcodec to open the multi-instance port "/dev/amstream_vbuf_sched" has the same problem.

The errors are coming from linux/drivers/amlogic/media_modules/stream_input/amports/amstream.c:amstream_open()
Looking at this function, the only port that seems to really allow multi-instance is /dev/amstream_vframe... which is a frame-based port (vs stream-based parsed by stream_input/parser code). Problem is, I have no idea how to feed h264 frame-based content to /dev/amstream_vframe... I can't find any example player code anywhere that uses this port (Amlogic's term for it). I tried feeding NAL units to it... nope... I imagine it wants a full frame of data. I started reading through the kernel driver and codec, to see what data is needed... but... it's dense stuff.
Kodi seems to use a different port (/dev/video10?) with frame-based input... and with a newer libamcodec.so, that includes references to multi-instance decode. So... seems like maybe Kodi is the closest to using vdec in a way that would give multi-instance decoding... but... Kodi doesn't seem to have UI/code for multiple streams...

Lots to dig through... everything points to "this is possible"... but no real answers yet

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Re: Multi-instance vdec

Post by odroid »

Are you digging this kplayer source code?
https://github.com/hardkernel/buildroot ... _LibPlayer

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Re: Multi-instance vdec

Post by forgetjake »

Yes, I have looked through kplayer.c -> amplayer/player/* -> amcodec/codec... it's pretty simple code, that ends up just opening one of the /dev/amstream_* ports. Those "ports" are serviced by the kernel driver (linux/drivers/amlogic/media_modules/*), in ...stream_input/amports/amstream.c, which doesn't allow multi-instance on the ports used by this version of libplayer.
(If I got this wrong... if I missed something... please let me know and I will happily revisit it!)
Thanks!

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Re: Multi-instance vdec

Post by _BG_ »

Hi,
I have been looking at the same problem myself lately, and currently at the exact same point i.e everything points to "this is possible"... but no real answers yet

The closest existing kinda working solution for me was the Android release

If you use Android Split screen with two different video players you can see in dmesg that two vdec instances are created using the multi-instance driver. I think that is using the frame-based port you have mentioned (see below)


[ 7484.406332] <7>[ 7484.406332@0] vdec_create instance ffffff800c000000, total 1
[ 7484.406418] <6>[ 7484.406418@0] vdec_init, dev_name:ammvdec_h264, vdec_type=VDEC_TYPE_FRAME_BLOCK
[ 7484.407302] <7>[ 7484.407302@0] ammvdec_h264_mmu_init tvp = 0x0 mmu_enable 0
[ 7484.407323] <7>[ 7484.407323@0] 0: ammvdec_h264_probe mmu_enable 0 double_write_mode 0x0
[ 7484.408249] <7>[ 7484.408249@2] 0: ammvdec_h264 mem-addr=0,buff_offset=64010000,buf_start=65000000
[ 7484.408288] <7>[ 7484.408288@2] vdec mux clock is 799999987 Hz
[ 7484.408293] <7>[ 7484.408293@2] vdec1 video changed to 3840 x 2160 60 fps clk->800MHZ
[ 7484.408712] <7>[ 7484.408712@2] vfm map vdec-map-0 created
[ 7484.408976] <7>[ 7484.408976@2] vdec_init, vf_provider_name = vdec.h264.00
[ 7484.409194] <6>[ 7484.409194@3] vdec->port_flag=0x102, port_flag=0x10b
[ 7502.855618] <7>[ 7502.855618@0] the vdec clock on, ref cnt: 2
[ 7502.855677] <7>[ 7502.855677@0] vdec_create instance ffffff800c0d8000, total 2
[ 7502.855914] <6>[ 7502.855914@0] vdec_init, dev_name:ammvdec_h264, vdec_type=VDEC_TYPE_FRAME_BLOCK
[ 7502.860833] <7>[ 7502.860833@0] ammvdec_h264_mmu_init tvp = 0x0 mmu_enable 0
[ 7502.860856] <7>[ 7502.860856@0] 1: ammvdec_h264_probe mmu_enable 0 double_write_mode 0x0
[ 7502.861639] <7>[ 7502.861639@0] 1: ammvdec_h264 mem-addr=0,buff_offset=654e0000,buf_start=664d0000
[ 7502.861996] <7>[ 7502.861996@0] vfm map vdec-map-1 created
[ 7502.862052] <7>[ 7502.862052@0] vdec_init, vf_provider_name = vdec.h264.01
[ 7502.862215] <6>[ 7502.862215@0] vdec->port_flag=0x102, port_flag=0x10b


The reason I am saying "kinda working" is because the second stream is never smooth , here is a video of it

https://www.dropbox.com/s/axwei2pvv4mcn ... 6.MOV?dl=0

Don't know if it is a rendering issue or a memory bandwidth issue or even a codec sched/sync issue with multi instances etc.
Currently trying to understand it, any ideas appreciated

But anyhow, the android OpenMax path could give you an idea about how to at least create multiple instances and how to feed them for your further analysis

I personally am not interested in the Android path as a final solution, but trying to see whether multi instance decoding is at all possible or not.

BG

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Re: Multi-instance vdec

Post by forgetjake »

@BG, wow, that's *very* encouraging!!!!

IIRC, your dmesg snippet looks a lot like Kodi's (coreELEC): "vdec_init, dev_name:ammvdec_h264, vdec_type=VDEC_TYPE_FRAME_BLOCK", which I think is opening the port via /dev/video10.

Do you know if Android is opening /dev/amstream_vframe, or /dev/video10 (or some other /dev/videoX) which would seem to indicate V4L2 API use... ?
Which Android release are you using... on C4 or HC4 or something else?
I would like to replicate. I'm not that familiar with Android... how do you config/play "Android Split screen"?
Did you use the libamcodec.so in that release, or did you sub in something newer?

Personally, I also don't care about Android... only Linux (4.9.x is fine... some day mainline), with custom player code, display through Qt5.

What I'm thinking: if we can figure out how the data is fed through amcodec to /dev/amstream_vframe , or if it's skipping amcodec and going to /dev/videoX, then we can feed the data in the same way.. and then start to look at what vdec scheduling problems exist...

Would like to collaborate.

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Re: Multi-instance vdec

Post by crashoverride »

One of the lines I noticed was this:

Code: Select all

[ 7484.408712] <7>[ 7484.408712@2] vfm map vdec-map-0 created
The decoders usually output directly to a video layer canvas (VID0). Its reasonable to assume that two decoder instances can not decode to the same destination. The "vfm" message reminded me that media graph is configurable and may require a differently configuration than the default for multi-instance use.

Code: Select all

$ cat /sys/class/vfm/map 
[00]  default { decoder(0) amvideo}
[01]  default_amlvideo2 { vdin1(0) amlvideo2.1}
[02]  dvblpath { dvbldec(0) amvideo}
[03]  dvelpath { dveldec(0) dvel}
[04]  dvhdmiin { dv_vdin(0) amvideo}

provider list:

receiver list:
   amvideo
   videopip
   deinterlace
   amlvideo
   aml_video.1
   ppmgr
   ionvideo
   ionvideo.1
   ionvideo.2
   ionvideo.3
   ionvideo.4
   ionvideo.5
   ionvideo.6
   ionvideo.7
   ionvideo.8
   videosync.0
   dvel
Try testing the "ionvideo.*" targets as the sink.

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Re: Multi-instance vdec

Post by mad_ady »

Perhaps a profiling tool like strace or ebpf filters could show you what's going on (https://www.brendangregg.com/ebpf.html). Not sure if they are available in Android...

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Re: Multi-instance vdec

Post by _BG_ »

@forgetjake

I am just using Hardkernel Android 9 release on Odroid C4 from the odroid wiki

https://wiki.odroid.com/odroid-c4/os_im ... id/android

I am not an Android user myself either, but Split screen is basically when you open two android apps side by side.

Like here https://www.youtube.com/watch?v=zuiKgagO71Y

I basically connect a mouse and just open MoviePlayer on one side and using the Gallery VideoPlayer on the other.

So in terms of the codec libs, these stock Android apps are actually using OpenMax APIs and regular Android media pipeline it seems.

You can see media.codec and media.extractor etc. below

So the real answers should be in the android media/omx port layer , not the apps themselves.

Code: Select all

  3021 media        20   0 175M  21M  17M S 14.3   0.5   0:37.07 mediaserver                                                            
 3025 mediacodec   20   0 109M  22M  14M S 11.6   0.5   0:27.06 media.codec hw/android.hardware.media.omx@1.0-service                  
 3002 audioserver  20   0  50M  18M  16M S  4.6   0.4   0:11.25 audioserver                                                            
 2980 audioserver  20   0  42M  13M  11M S  3.6   0.3   0:11.94 android.hardware.audio@2.0-service                                     
 3216 system       18  -2 4.3G 229M 197M S  3.0   6.1   1:02.13 system_server                                                          
 3411 system       20   0 3.6G  90M  74M S  2.0   2.4   0:09.93 com.droidlogic                                                         
 2845 root         RT   0    0    0    0 S  1.6   0.0   0:03.34 [vdec-core]                                                            
 4498 shell        20   0  11M 4.1M 3.2M R  1.3   0.1   0:05.65 top                                                                    
 3019 mediaex      20   0 2.1G  90M  21M S  1.3   2.4   0:11.72 media.extractor aextractor                                             
 3004 system       -2  -8 2.1G  44M  31M S  1.0   1.1   1:17.60 surfaceflinger                                                         
 2844 root         RT   0    0    0    0 S  0.6   0.0   0:00.68 [irq/44-vdec-1]                                                        
 5041 u0_a61       20   0 3.8G 195M 117M S  0.3   5.2   0:03.10 com.droidlogic.videoplayer                                             
 4994 root         RT   0    0    0    0 S  0.3   0.0   0:00.44 [irq/28-ff660000]                                                      
 2978 root         20   0  29M  10M 7.5M S  0.3   0.2   0:03.16 systemcontrol                                                          
 2972 root         20   0 2.0G 8.0M 6.8M S  0.3   0.2   0:00.17 netd                                                                   
 1940 root         20   0    0    0    0 S  0.3   0.0   0:00.93 [kthread_di]
   17 root         20   0    0    0    0 S  0.3   0.0   0:00.05 [ksoftirqd/1]
 5194 root         RT   0    0    0    0 S  0.0   0.0   0:00.01 [ppmgr]
 5193 root         RT   0    0    0    0 S  0.0   0.0   0:00.00 [tb_detect]
 5061 root          0 -20    0    0    0 S  0.0   0.0   0:00.00 [kbase_event]
 4958 root         20   0    0    0    0 S  0.0   0.0   0:00.07 [kworker/3:0]
 4938 root         20   0    0    0    0 S  0.0   0.0   0:00.44 [kworker/0:0]
 4450 root          0 -20    0    0    0 S  0.0   0.0   0:00.00 [kbase_event]
 4429 u0_a59       10 -10 4.2G 154M 120M S  0.0   4.1   0:05.62 com.android.gallery3d
 4400 root          0 -20    0    0    0 S  0.0   0.0   0:00.00 [kbase_event]
[\code]

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Re: Multi-instance vdec

Post by forgetjake »

Thanks, @crashoverride

I had the same thought about display/sink being an issue, so I tried pointing ionplayer at the multi-instance port /dev/amstream_vbuf_sched. I got the same old EBUSY/errno=16 error, because linux/drivers/amlogic/media_modules/stream_input/amports/amstream.c:amstream_open() sees that port as in-use. From that amstream_open() function, the only amport that skips the in-use check is /dev/amstream_vframe... frame-based data, as used by Kodi and now it seems Android....but ionplayer (with the amcodec supplied by HK) only opens and feeds stream-based es content.

The in-use check on /dev/amstream_vbuf_sched had me thinking: perhaps there's some way (some API?) that clears PORT_FLAG_IN_USE, so that multiple opens can proceed?
The check itself is:
if ((port->flag & PORT_FLAG_IN_USE) &&
((port->type & PORT_TYPE_FRAME) == 0)) { // <== so all stream-based in-use ports fall into this error, frame-based ports are OK...
mutex_unlock(&amstream_mutex);
return -EBUSY;
}
All the port flags are cleared by a amstream_release() => amstream_port_release(), but this is on the close of the port, not a simple scheduling thing...
So... unclear how multiple opens of /dev/amstream_vbuf_sched ever can happen. The port name has "sched" in it, and that port's attributes have flag "PORT_TYPE_DECODER_SCHED"... implication seems to be that some codec scheduler (time slicer?) is involved... and needs to be invoked to free up the port?
I suppose I need to dig through this more.

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Re: Multi-instance vdec

Post by forgetjake »

@crashoverride -- ignore my last comment.
You wrote: Try testing the "ionvideo.*" targets as the sink.
I read [way too quickly] as: "Try testing the "ionplayer*"
;-)

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Re: Multi-instance vdec

Post by _BG_ »

@crashoverride

Thanks for the help
crashoverride wrote:
Thu Oct 07, 2021 3:25 am
One of the lines I noticed was this:

Code: Select all

[ 7484.408712] <7>[ 7484.408712@2] vfm map vdec-map-0 created
Yeah I saw a similar but different one created for the second instance, not sure if it makes a difference

Code: Select all

[ 7502.861996] <7>[ 7502.861996@0] vfm map vdec-map-1 created
crashoverride wrote:
Thu Oct 07, 2021 3:25 am
The decoders usually output directly to a video layer canvas (VID0). Its reasonable to assume that two decoder instances can not decode to the same destination. The "vfm" message reminded me that media graph is configurable and may require a differently configuration than the default for multi-instance use.
This actually brings up my future questions about how to access the decoded data.
Even if we manage to get two decoder instances running, not sure how we can access the decoded pixels for rendering to a custom window or a GL surface etc.

I have used the libamcodec way before like the esplayer, but when you simply use codec_init() ... codec_write() , decoding + rendering on video plane happens as a whole.

crashoverride wrote:
Thu Oct 07, 2021 3:25 am
Try testing the "ionvideo.*" targets as the sink.
Any pointers how I could do that would be much appreciated.
Is there any resource rather than the source code that I may be missing about how to modify and learn about the media graph or the media pipeline in general on these devices?

Thanks

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Re: Multi-instance vdec

Post by forgetjake »

@_BG_
_BG_ wrote:
Thu Oct 07, 2021 4:30 pm
Even if we manage to get two decoder instances running, not sure how we can access the decoded pixels for rendering to a custom window or a GL surface etc.
LibPlayer's examples/ionplayer.c uses amvideo*/amlv4l* APIs, to get decoded frames in NV12 from /dev/video13.
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Re: Multi-instance vdec

Post by crashoverride »

_BG_ wrote:
Thu Oct 07, 2021 4:30 pm
Even if we manage to get two decoder instances running, not sure how we can access the decoded pixels for rendering to a custom window or a GL surface etc.
Long ago, I wrote an example for the ODROID-C2. It should be adaptable to the C4/N2:
https://github.com/OtherCrashOverride/CXVideoCube

It illustrates using the IonVideo target through the vfm map:
https://github.com/OtherCrashOverride/C ... n.cpp#L356

The ionvideo device is used with a V4L2 style interface. Ion buffers (conceptually similar to GEM) are created and a DMA-BUF handle is used to allow sharing between IonVideo and GLES:
https://github.com/OtherCrashOverride/C ... #L739-L762

The DMA-BUF handle is imported GLES using the EGLImage extension:
https://github.com/OtherCrashOverride/C ... 1078-L1140

The discussion thread at the time can be found here:
viewtopic.php?f=136&t=21948
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