[Libav-user] AVIOInterruptCB and how to use it

[Yurii Monakov]

Hi,

Initial value of interrupt_callback can be cached internally somewhere
inside avformat_find_stream_info.
My code performs assignment just right after context allocation.

Regards,
Yurii


вт, 9 нояб. 2021 г. в 18:23, Simon Brown <simon.k.brown at gmail.com>:

> Hi,
> I'm trying to stop av_read_frame from blocking when the stream is stopped
> (stream over TCP, and the sender pauses sending).  Reading various forum
> posts, it would appear that I need to use the AVIOInterruptCB structure and
> assign it to my format context.  So I do this:
>
>     /* retrieve stream information */
>     if (avformat_find_stream_info(fmt_ctx, NULL) < 0) {
>         fprintf(stderr, "Could not find stream information\n");
>         exit(1);
>     }
>     static const AVIOInterruptCB int_cb = {interrupt_cb, &int_cb_ctx};
>     fmt_ctx->interrupt_callback = int_cb;
>
> where interrupt_cb and int_cb_ctx are defined as:
>
> static int interrupt_cb(void *ctx)
> {
> int *p = (int *)ctx;
> *p = 53;
> return 1;
> }
>
> int int_cb_ctx = 0;
>
> The only problem now is that av_read_frame still blocks, there's no
> evidence that interrupt_cb is being called, and I cannot restart my stream
> because my decoder gets stuck in av_read_frame.
>
> Is there anything I am doing wrong?  Or is this a feature that has been
> deprecated?  Is there a better way of getting out of av_read_frame blocking?
>
> Cheers,
> Simon
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