Maxim's Atrac3plus decoder

[maximumspatium]

Hi guys (and girlz),

my ATRAC3+ decoder has finally been posted to the FFmpeg project.

You can either follow up on our discussion here:
http://ffmpeg.org/pipermail/ffmpeg-devel...49248.html

or grab the latest Git snapshot, apply the above-mentioned patches and start to experiment with the decoder yourself.

Enjoy!
Best regards
Maxim

---

Not only did the preliminary version that Maxim gave me work flawlessly on the bunch of games I tested it on (I have to add a disclaimer that I obviously didn't test it on the entire PSP game library though), but it appears to run considerably faster than our current "solution". So CPU usage when playing Atrac3+ music will decrease for those of you who have been using the plugin, improving speed somewhat.

I'm pleased to hear that!

At the time being, you're running a scalar version of the decoder. Its speed can be increased by 15-20% by vectorizing several DSP functions.

Most modern CPUs include some kind of SIMD/Vector instructions in order to improve the performance of multimedia applications...

---

Even though it will take a while for ATRAC3+ to reach JPCSP (still has to go through Xuggler), PPSSPP will be able to implement it soon and give people the so long awaited missing sound.

IIRC, Xuggler is just a Java wrapper for FFmpeg, isn't?
What do you need for Xuggler being able to decode ATRAC3+? A custom FFmpeg build?

Best regards
Maxim

[Henrik]

Fantastic! I'm sure it will breeze through review

[Hykem]

Hi guys (and girlz),

my ATRAC3+ decoder has finally been posted to the FFmpeg project.

You can either follow up on our discussion here:
http://ffmpeg.org/pipermail/ffmpeg-devel...49248.html

or grab the latest Git snapshot, apply the above-mentioned patches and start to experiment with the decoder yourself.

Enjoy!
Best regards
Maxim

---

Not only did the preliminary version that Maxim gave me work flawlessly on the bunch of games I tested it on (I have to add a disclaimer that I obviously didn't test it on the entire PSP game library though), but it appears to run considerably faster than our current "solution". So CPU usage when playing Atrac3+ music will decrease for those of you who have been using the plugin, improving speed somewhat.

I'm pleased to hear that!

At the time being, you're running a scalar version of the decoder. Its speed can be increased by 15-20% by vectorizing several DSP functions.

Most modern CPUs include some kind of SIMD/Vector instructions in order to improve the performance of multimedia applications...

---

Even though it will take a while for ATRAC3+ to reach JPCSP (still has to go through Xuggler), PPSSPP will be able to implement it soon and give people the so long awaited missing sound.

IIRC, Xuggler is just a Java wrapper for FFmpeg, isn't?
What do you need for Xuggler being able to decode ATRAC3+? A custom FFmpeg build?

Best regards
Maxim

Pretty much, yes. However, I believe it should be possible to implement the changes directly in Xuggler's source code and build the whole framework at the same time (Xuggler + FFmpeg) with little trouble.
I've been looking into this and since Xuggler is built on top of FFmpeg's code it should be just a matter of updating the FFmpeg captive files first ( https://github.com/artclarke/xuggle-xugg...er/captive ) and then manually add the new codec's info to the source code ( https://github.com/artclarke/xuggle-xugg...r/ICodec.h ) and apply all the necessary changes afterwards.

I'll try forking Xuggler and merge the latest FFmpeg snapshot and your patch to see what I can come up with.

Good luck with the review, Maxim.

Regards,
Hykem

[Marcelo_20XX]

Really great news here! I take the opportunity to thank you Maxim for all your hard work and sorry for doubting you in the first place, hope we can have this implemented on PPSSPP in the near future...I will patiently await from now on

[Apology11]

Hi guys (and girlz),

my ATRAC3+ decoder has finally been posted to the FFmpeg project.

You can either follow up on our discussion here:
http://ffmpeg.org/pipermail/ffmpeg-devel...49248.html

or grab the latest Git snapshot, apply the above-mentioned patches and start to experiment with the decoder yourself.

Enjoy!
Best regards
Maxim

Does anybody want to share a build with the patches?

[cloud1250000]

well, probably soon enough on ppsspp git ahah but.. it still reviewed by the ffmpeg team

[GuilhermeGS2]

How it will work, by plugin or implemented in the PPSSPP? What is the advantage besides being faster?

[Henrik]

Aside from being faster, the big advantage is that we don't need a plugin anymore, we just link ffmpeg as we already do.

[vnctdj]

A big step in PPSSPP development

[aki21]

yeah,right now atrac3+ plugin not stable for me,it totally crashing in random place in few games,but it relate to newest build anyways,older build still stable and don't frequently crash.

[GuilhermeGS2]

It will fix issues on ffmepg too or just on audio playback? Because I get issues in video playback on some games.

[xZabuzax]

I don't want to create a new thread for this question but i wonder, why hasn't anybody created a plugin for Winamp using the current MaiAT3PlusDecoder?

That decoder was out for a while and nobody never bothered to create a plugin for Winamp or any other music program out there.

[VIRGIN KLM]

Since ffmpeg now can now decode ATRAC3+ you can link your played to ffmpeg to decode those files with no extra plugin.

[xZabuzax]

Since ffmpeg now can now decode ATRAC3+ you can link your played to ffmpeg to decode those files with no extra plugin.

Indeed, but i was just wondering why nobody did a Winamp plugin with MaiAT3PlusDecoder since it was the only open source decoder to get music working when it came out months ago.

[cloud1250000]

because nobody in the dev community is caring about at3+ file?

Like maxim finished his work.. probably because he already had done a big part of it and was like: "meh I could at least finish it for psp emulator..."

ps.: srsly don't trust me, I'm saying shit right now.