- av_log(avctx, AV_LOG_ERROR, "Could not get pixel buffer pool.\n");
- return AVERROR_EXTERNAL;
+ /* On iOS, the VT session is invalidated when the APP switches from
+ * foreground to background and vice versa. Fetch the actual error code
+ * of the VT session to detect that case and restart the VT session
+ * accordingly. */
+ OSStatus vtstatus;
+
+ vtstatus = VTCompressionSessionPrepareToEncodeFrames(vtctx->session);
+ if (vtstatus == kVTInvalidSessionErr) {
+ CFRelease(vtctx->session);
+ vtctx->session = NULL;
+ status = vtenc_configure_encoder(avctx);
+ if (status == 0)
+ pix_buf_pool = VTCompressionSessionGetPixelBufferPool(vtctx->session);
+ }
+ if (!pix_buf_pool) {
+ av_log(avctx, AV_LOG_ERROR, "Could not get pixel buffer pool.\n");
+ return AVERROR_EXTERNAL;
+ }
+ else
+ av_log(avctx, AV_LOG_WARNING, "VT session restarted because of a "
+ "kVTInvalidSessionErr error.\n");