pl_mpegDC ported running but community help needed

[Ian Robinson]

Thank you for listening to my unreasonable request.
I'm not familiar with stream-related code, so this is a very valuable hint!

Again, we need to speed up audio decoding. I'll try again after I cool my head.

Decoding is slow for ogg and mp3.. Even in kos ports.. Only thing i do to make it work is very low bit-rate 64bit and mono..Sometimes 32 Also 22khz sample rate speeds it up..

Not going to be doing 44khz stereo that's for sure while decoding video and audio with the current kos streamer.

[Twada]

Decoding is slow for ogg and mp3.. Even in kos ports.. Only thing i do to make it work is very low bit-rate 64bit and mono..Sometimes 32 Also 22khz sample rate speeds it up..

Not going to be doing 44khz stereo that's for sure while decoding video and audio with the current kos streamer.

This is a version that changes the window array and uses the fipr instruction.
Since I only output mono, 320x240 video should be fast enough with sound.
But it's not threaded yet, so it looks slow. someone please help me

pl_mpeg7.rar

(63.95 KiB) Downloaded 55 times

Fixed pl_mpeg.c. sorry.

For some reason, a memory leak occurs when I specify monaural with "snd_stream_start(snd_hnd, samplerate, 0);".
I don't know if it's a pl_mpeg error or a KOS error...

[BB Hood]

Please please please get on Github. It would be a lot easier for others to see your code and be able to help. I download the code and ran it. It crashes as soon as I upload it through dcload.

[Ian Robinson]

Please please please get on Github. It would be a lot easier for others to see your code and be able to help. I download the code and ran it. It crashes as soon as I upload it through dcload.

Did you use the right size video ?

[Twada]

I wanted to reduce the storage space, so I deleted the sample videos.
This is a bundled version. I think this will work.

pl_mpeg7_1.rar

(7.13 MiB) Downloaded 69 times

I'm going to learn about GitHub. It certainly seems more convenient to use GitHub if you want to ask for help from the community.

[Ian Robinson]

I wanted to reduce the storage space, so I deleted the sample videos.
This is a bundled version. I think this will work.
pl_mpeg7_1.rar

I'm going to learn about GitHub. It certainly seems more convenient to use GitHub if you want to ask for help from the community.

I will take a look at that see what i can do.. You have gone far past my port of it so there is not much put going with mine..

[Ian Robinson]

Decoding is slow for ogg and mp3.. Even in kos ports.. Only thing i do to make it work is very low bit-rate 64bit and mono..Sometimes 32 Also 22khz sample rate speeds it up..

Not going to be doing 44khz stereo that's for sure while decoding video and audio with the current kos streamer.

This is a version that changes the window array and uses the fipr instruction.
Since I only output mono, 320x240 video should be fast enough with sound.
But it's not threaded yet, so it looks slow. someone please help me

pl_mpeg7.rar
Fixed pl_mpeg.c. sorry.

For some reason, a memory leak occurs when I specify monaural with "snd_stream_start(snd_hnd, samplerate, 0);".
I don't know if it's a pl_mpeg error or a KOS error...

Ok works fine i just compiled it and sent to hardware
https://streamable.com/pftkip

now the video is slower yes audio decoding takes a big hit out of the cpu and streaming as normal.. I will test the memory leak you said..

[Ian Robinson]

First think i do is fix all warnings i always do that and go from there.. upload the fixed code.Because of the memory leak you warned about as that's not in kos i call mono like that with out that problem.

[Twada]

It has finally been completed! Thanks to Ian and BBHood!
You can play 320x240 Mpeg1 files with sound.

mpeg1dc.rar

(3.38 MiB) Downloaded 61 times

Edit:Fix line 164 in mpeg1.c.

Please set the resolution to 320x240 (4:3) or 368x208 (16:9). Please use monaural sound of 80kbits or less.
Due to copyright reasons, the sample video has been replaced.

The frame rate control is quite sloppy, so feel free to modify it as you like.
I hope it is helpful to the Dreamcast community.
I'll try GitHub another time...

[lerabot]

Thank you very much Twada! The source code itself it also very nice to study.

[Ian Robinson]

It has finally been completed! Thanks to Ian and BBHood!
You can play 320x240 Mpeg1 files with sound.

mpeg1dc.rar

Please set the resolution to 320x240 (4:3) or 368x208 (16:9). Please use monaural sound of 80kbits or less.
Due to copyright reasons, the sample video has been replaced.

The frame rate control is quite sloppy, so feel free to modify it as you like.
I hope it is helpful to the Dreamcast community.
I'll try GitHub another time...

fantastic Twada ::)

[Ian Robinson]

It has finally been completed! Thanks to Ian and BBHood!
You can play 320x240 Mpeg1 files with sound.

mpeg1dc.rar

Please set the resolution to 320x240 (4:3) or 368x208 (16:9). Please use monaural sound of 80kbits or less.
Due to copyright reasons, the sample video has been replaced.

The frame rate control is quite sloppy, so feel free to modify it as you like.
I hope it is helpful to the Dreamcast community.
I'll try GitHub another time...

thank you again amazing work..
Here is the video running pefect
https://streamable.com/9rn4uc

[Ian Robinson]

I wanted to reduce the storage space, so I deleted the sample videos.
This is a bundled version. I think this will work.
pl_mpeg7_1.rar

I'm going to learn about GitHub. It certainly seems more convenient to use GitHub if you want to ask for help from the community.

Can i put this up on my github course all credit to you

[Twada]

Can i put this up on my github course all credit to you

Thank you! Please.
I have fixed line 164 of mpeg1.c, so please download it again. The file name was not passed correctly.

[Ian Robinson]

Can i put this up on my github course all credit to you

Thank you! Please.
I have fixed line 164 of mpeg1.c, so please download it again. The file name was not passed correctly.

Ok i put it up on github with your handle and name post it here..

[GyroVorbis]

Wow, congratulations! This is fantastic work!

I really don't know anything about media decoding, but I'm an engine/graphics programmer, and the fact FIPR got used here got me curious... and sure enough, I see what you did in the hot path with the linear algebra. Also see the strategic prefetching. Very nice!

Given what a monumental accomplishment this is, and how much interest there is in it, what would you think of the idea of us including it as a first party library in KOS-ports? That way it has the potential to reach the widest audience, we can add examples, we can ensure we don't break anything in KOS by maintaining and testing the examples, and it would be extremely easy for homebrew developers to utilize.

[Ian Robinson]

Can i put this up on my github course all credit to you

Thank you! Please.
I have fixed line 164 of mpeg1.c, so please download it again. The file name was not passed correctly.

here you go
https://github.com/ianmicheal/MPEG1-Dec ... /tree/main

[Twada]

here you go
https://github.com/ianmicheal/MPEG1-Dec ... /tree/main

Thank you, Ian, for uploading it to GitHub!
Thank you for all the hard work you put into fixing and uploading the Readme.
I would be happy if many people could use it as they like.

Given what a monumental accomplishment this is, and how much interest there is in it, what would you think of the idea of us including it as a first party library in KOS-ports? That way it has the potential to reach the widest audience, we can add examples, we can ensure we don't break anything in KOS by maintaining and testing the examples, and it would be extremely easy for homebrew developers to utilize.

We would be honored if you could add us to Kos-Ports! Please feel free to use it!
Ah, but now that I think about it, I haven't explicitly reset the sound callback's static variable, so it might cause some audio lag when playing continuously.
Also, it may be necessary to add software reset (ABXY+START) processing.
I think more improvements are needed to make it first party.

[Ian Robinson]

here you go
https://github.com/ianmicheal/MPEG1-Dec ... /tree/main

Thank you, Ian, for uploading it to GitHub!
Thank you for all the hard work you put into fixing and uploading the Readme.
I would be happy if many people could use it as they like.

Given what a monumental accomplishment this is, and how much interest there is in it, what would you think of the idea of us including it as a first party library in KOS-ports? That way it has the potential to reach the widest audience, we can add examples, we can ensure we don't break anything in KOS by maintaining and testing the examples, and it would be extremely easy for homebrew developers to utilize.

We would be honored if you could add us to Kos-Ports! Please feel free to use it!
Ah, but now that I think about it, I haven't explicitly reset the sound callback's static variable, so it might cause some audio lag when playing continuously.
Also, it may be necessary to add software reset (ABXY+START) processing.
I think more improvements are needed to make it first party.

Do you think with this it would be possible to add function for pause/resume a movie ? ..

[GyroVorbis]

We would be honored if you could add us to Kos-Ports! Please feel free to use it!

Thank you so much on behalf of everyone! I think this will be an incredibly useful port in the future!

Ah, but now that I think about it, I haven't explicitly reset the sound callback's static variable, so it might cause some audio lag when playing continuously.
Also, it may be necessary to add software reset (ABXY+START) processing.
I think more improvements are needed to make it first party.

Oh yeah, this is totally expected. After all, you just barely got the thing up and working! I figured there would be some polishing that would need to be done. I've added a task to the KOS backlog for helping to get this ready to be added as a KOS-Port!