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[DriMarq]

Hi,

Please, could anyone say me what is the most efficient way to avoid a perceptible gap ('tic') when playing audio files in sequence?

I'm sure the audio files are nice because when I merge them (in one) I don't notice any gap.

For example, how could I optimize the following code?

DWORD s1 = BASS_StreamCreateFile(FALSE, fileName1,0,0,0);
DWORD s2 = BASS_StreamCreateFile(FALSE, fileName2,0,0,0);

BASS_ChannelPlay(s1,FALSE);

while (BASS_ChannelIsActive(s1) )
{
   // Here it is 'locked', but it is just an example.
}

BASS_ChannelPlay(s2,FALSE);

Thanks in advance

[DriMarq]

The audio transition from XMPlay is very very good (no gap is noticed). Please, does anyone know what BASS resource was used to implement the audio transition in XMPlay?

[Ian @ un4seen]

The way to do perfect gapless playback is to use the same output stream to play all the tracks, ie. feed decoding channels into a custom stream. For simplicity, I'd suggest using BASSmix to do it, something like this...

mixer=BASS_Mixer_StreamCreate(44100, 2, BASS_MIXER_END); // create mixer
BASS_ChannelSetSync(mixer, BASS_SYNC_END|BASS_SYNC_MIXTIME, 0, EndSync, 0); // set sync for end

source=BASS_StreamCreateFile(...,BASS_STREAM_DECODE|BASS_SAMPLE_FLOAT); // open 1st source
BASS_Mixer_StreamAddChannel(mixer, source, BASS_STREAM_AUTOFREE); // plug it in (and auto-free it when it ends)

BASS_ChannelPlay(mixer, FALSE); // start playing

...

void CALLBACK EndSync(HSYNC handle, DWORD channel, DWORD data, DWORD user)
{
if (!more_sources) return;
source=BASS_StreamCreateFile(...,BASS_STREAM_DECODE|BASS_SAMPLE_FLOAT); // open next source
BASS_Mixer_StreamAddChannel(mixer, source, BASS_STREAM_AUTOFREE|BASS_MIXER_NORAMPIN); // plug it in
BASS_ChannelSetPosition(mixer, 0); // reset the mixer
}

[DriMarq]

Thanks Ian! Your code minimized the gap time... I just noticed a very small 'tic' now. 

Was XMPlay implemented with BASSmix? There I don't notice any gap. XMPlay is really fantastic.

Thanks again.

[Ian @ un4seen]

Thanks Ian! Your code minimized the gap time... I just noticed a very small 'tic' now. 

Ah, that'll probably be due to the new tracks being ramped-in. That's intended to avoid possible clicks, but in this scenario (gap-less playback), it could actually cause one. I guess an option to disable that is required, so an update is now in the BASSmix download...

   www.un4seen.com/stuff/bassmix.zip

I've updated the example above. Btw, I forgot to make the source channels floating-point (for better performance), so I've added that (BASS_SAMPLE_FLOAT) now too.

Was XMPlay implemented with BASSmix? There I don't notice any gap. XMPlay is really fantastic.

No, XMPlay doesn't use BASSmix, but it does do the same basic thing that I described

[DriMarq]

  WOW... Thank you very much!!!