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[sa1988]

I have created loop functionality using This code.
BASS_ChannelSetSync(mainStream, BASS_SYNC_POS|BASS_SYNC_MIXTIME, BASS_ChannelSeconds2Bytes(mainStream, timeForLoopOut), &MySyncProc,self);

And my callback function is:-
void CALLBACK MySyncProc(HSYNC handle, DWORD channel, DWORD data, void *user)
{
BASS_ChannelSetPosition(channel, BASS_ChannelSeconds2Bytes(channel, timeForLoopIn),BASS_POS_BYTE);      
}

But callback function called early not on the time of loop-out.

Is there any way to callback on exact time of loop out?
I am using iOS version of bass.

[Ian @ un4seen]

When you say the SYNCPROC is called early, do you mean that BASS_ChannelGetPosition reports an earlier position? If so, that will be because it is reporting the position being heard, not the position being decoded. You can use the BASS_POS_DECODE flag to get the decoding position, which should match the sync's position.

Note the BASS_SYNC_MIXTIME flag will mean that your SYNCPROC is called when the decoder reaches the position, not when playback does (which will be later due to buffering).

[sa1988]

Is there any way to convert position  BASS_POS_BYTE position to   BASS_POS_DECODE  position?
I had used time of loop-out which is returned by this code:
loopOutTime=BASS_ChannelBytes2Seconds(mainStream,BASS_ChannelGetPosition(mainStream,BASS_POS_BYTE));

And i need to convert it to time which is taken using flag BASS_POS_DECODE.
Because callback function uses position BASS_POS_DECODE and i had set position using flag
BASS_POS_BYTE . when loop-out pressed i have to set time of stream which is user hearing not the position of decoding.

[Ian @ un4seen]

If you want to set the sync at the position currently being heard, then that "loopOutTime" calculation looks fine (you don't want the BASS_POS_DECODE flag there). If it isn't working as expected, please confirm what sort of channel "mainStream" is, eg. post the code you're using to create it. If it's a mixer source, then you should use BASS_Mixer_ChannelGetPosition (instead of BASS_ChannelGetPosition) to get the position being heard.

[sa1988]

Hi

I am creating my stream using this code:-

BASS_Init(-1, 44100, 0, 0, NULL);
BASS_SetConfig(BASS_CONFIG_BUFFER, 5);
BASS_SetConfig(BASS_CONFIG_UPDATEPERIOD, 5);


middleStream = BASS_StreamCreateFile(FALSE,[pathStr UTF8String],0,0,BASS_SAMPLE_FLOAT|BASS_STREAM_PRESCAN|BASS_STREAM_DECODE);
reverseStream=BASS_FX_ReverseCreate(middleStream, 1,BASS_STREAM_DECODE);
mainStream= BASS_FX_TempoCreate(reverseStream,BASS_FX_FREESOURCE | BASS_SAMPLE_FLOAT );
BASS_ChannelSetAttribute(reverseStream, BASS_ATTRIB_REVERSE_DIR, (float)BASS_FX_RVS_FORWARD);

I want callback of setSync on position is being heard not decoded.
Thanks in advance.

[Ian @ un4seen]

OK. Please try setting the BASS_SYNC_POS sync on the source stream ("middleStream") instead of the playback/tempo stream ("mainStream"). You would still use the latter in the "loopOutTime" calculation.

[sa1988]

Cool !!!

Works for me.

Another question is how to check is BASS_ChannelSetSync is removed or not?
I want to remove it conditionally.
Means i want to call removeSync if stream is already synced.
 

Thanks

[radio42]

BASS_ChannelSetSync returns a handle to the sync.
This handle can/must be used in a BASS_ChannelRemoveSync call to remove it.
As such you need to 'know/remember' yourself if you have set a sync on a channel or not.
A SYNC is also automatically freed, if you free the underlying stream.