avformat: Pass the interrupt callback on to chained muxers/demuxers

There are a few more cases of chained demuxers, but they
only use custom IO which don't do any blocking IO and thus
don't need the callback.

libavformat/rtpenc_chain.c

@@ -47,6 +47,8 @@ AVFormatContext *ff_rtp_chain_mux_open(AVFormatContext *s, AVStream *st,
         av_free(rtpctx);
         return NULL;
     }
+    /* Pass the interrupt callback on */
+    rtpctx->interrupt_callback = s->interrupt_callback;
     /* Copy the max delay setting; the rtp muxer reads this. */
     rtpctx->max_delay = s->max_delay;
     /* Copy other stream parameters. */

libavformat/sapdec.c

@@ -157,6 +157,7 @@ static int sap_read_header(AVFormatContext *s,
     }
     sap->sdp_ctx->max_delay = s->max_delay;
     sap->sdp_ctx->pb        = &sap->sdp_pb;
+    sap->sdp_ctx->interrupt_callback = s->interrupt_callback;
     ret = avformat_open_input(&sap->sdp_ctx, "temp.sdp", infmt, NULL);
     if (ret < 0)
         goto fail;