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[nadia]

Hello 

I have a question: I would like to add a few streams to a mixer stream and give the possibility to play the resulting mixer stream in reverse: is there a way to do this or any idea about its feasibility?

Kind regards 

nadia

[Ian @ un4seen]

It won't be possible to reverse a mixer directly because it doesn't support seeking, but you could reverse the sources instead, ie. use BASS_FX_ReverseCreate on each of them.

Or if you're rendering the mix to a file, then you could reverse the file afterwards.

[nadia]

Hi 

indeed I thought that I could create the reverse for each source stream before adding to the mixer and then set them all the BASS_ATTRIB_REVERSE_DIR attribute when I need a reverse playback but my concern is if they would effectively play in reverse when I play the mixer stream through the BASS_ChannelPlay function.

Kind regards 

nadia

[Ian @ un4seen]

Yes, the mixer would receive reversed data from the sources.

If you will be switching between reverse/forward mid-playback, then you should lock the mixer to ensure all sources get switched at the same time in the mix:

Code SelectExpand

BASS_ChannelLock(mixer, true); // lock the mixer
// set BASS_ATTRIB_REVERSE_DIR on each source here
BASS_ChannelLock(mixer, false); // unlock the mixer


[nadia]

Hi 
reversed streams added to a mixer work, but I have a problem that makes me nut.

If I append 3 reversed streams (A, B and C) to the mixer, they effectively play in reverse but always in the order A-B-C : when reverse play is needed, is there a way to make them play in the order C-B-A without the need to render the mixer's content to a file?

Kind regards 

nadia

[Ian @ un4seen]

If you're playing sources in sequence rather than all together, then that will indeed complicate things. You would need to add them to the mixer in reverse order, ie. C-B-A instead of A-B-C. For more complex scenarios, it may be better to pre-render the normal mix to a WAV file and then reverse that. Note you could do that all in memory by using BASS_Encode_StartPCM and a callback function that puts the WAV file in memory (and then pass it to BASS_StreamCreateFile with BASS_FILE_MEM).

[nadia]

Indeed I had good results in changing the order of the streams, now I can play in both directions but there seem to be a glitch.
In order to be notified when the playback of the mixer stream is completed, I've added a sync on the mixer stream (BASS_SYNC_END) and, obviously, the mixer was created using the BASS_MIXER_END flag: this works perfectly and the syncproc is called when playing in regular direction but the same doesn't happen when playing streams in reverse: am I missing something?

Kind regards

nadia

[Ian @ un4seen]

That seems like it should work. If you aren't already using it, please try the latest BASS_FX build:

    www.un4seen.com/stuff/bass_fx.zip

If the problem persists, do BASS_SYNC_END syncs set on the reverse stream sources get triggered?

[nadia]

I already have the latest bass_fx and yes, the sync is triggered when a reversed stream ends

Kind regards

nadia

[nadia]

Hello 

now it seems to work, sorry.

Kind regards

nadia

[Ian @ un4seen]

Did you change something or it just started working by itself? Anyway, good to hear it's working, however it happened

[nadia]

Did you change something or it just started working by itself? Anyway, good to hear it's working, however it happened

Hello, 
it was my fault, the usual "copy&paste" error.

Kind regards

nadia