setStreamTime?

[thestk]

setStreamTime?

[sonoro1234]

imagine I want to sync some video frames to audio stream:
with startStream streamtime starts increasing with each audiobuffer
with stopStream streamtime stops increasing so video frames stop increasing
then startStream again and streamtime goes on increasing and video frames procced

But if I want to rewind in order to play from sec. 5 in the movie (with video frames synced to streamtime) I should be able to do setStreamTime(5)

[garyscavone]

Hi Victor,

RtAudio is designed to work only with realtime audio streams. So, it is not possible to backup in a stream (no data is saved). Or am I misunderstanding you?

—gary

On Apr 23, 2014, at 3:57 PM, Victor Bombi [email protected] wrote:

imagine I want to sync some video frames to audio stream:
with startStream streamtime starts increasing with each audiobuffer
with stopStream streamtime stops increasing so video frames stop increasing
then startStream again and streamtime goes on increasing and video frames procced

But if I want to rewind in order to play from sec. 5 in the movie (with video frames synced to streamtime) I should be able to do setStreamTime(5)

—
Reply to this email directly or view it on GitHub.

[sonoro1234]

The purpose is only to change the clock that streamtime provides in order to sync things to it (for example some video frames)
I understand that if I am playing an audio file I would have to rewind that file by myself

[garyscavone]

I just added a new setStreamTime() function in the new release ... it was easy to do. For the moment, I only accept times >= 0.0, unless someone can convince me it should allow negative times too.

[sonoro1234]

Thanks alot!!!
Setting negative streamtime could be useful to implement pre-count: When something is queued on time 0 secs but you must do something prior to that (As in sequencers for example).
But if it were too complicated, user could always queue the first event on a positive time value.

victor

[garyscavone]

Hi Victor,

It would be extremely simple to change it to allow negative values. If you think it is useful, I will do that.

Regards,

—gary

On Apr 26, 2014, at 4:01 PM, Victor Bombi [email protected] wrote:

Thanks alot!!!
Setting negative streamtime could be useful to implement pre-count: When something is queued on time 0 secs but you must do something prior to that (As in sequencers for example).
But if it were too complicated, user could always queue the first event on a positive time value.

victor

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Reply to this email directly or view it on GitHub.

[sonoro1234]

Yes, it would be useful for implementing pre-count in a sequencer.

By the way I have the work done in https://github.com/sonoro1234/luaRtAudio
with this github RtAudio as a submodule.

Regards
victor