From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Mon, 25 Sep 2023 18:55:59 -0700
Subject: [PATCH] VP8: disallow thread count changes

Currently allocations are done at encoder creation time. Going from
threaded to non-threaded would cause a crash.

Bug: chromium:1486441
Change-Id: Ie301c2a70847dff2f0daae408fbef1e4d42e73d4
---
 libvpx/vp8/encoder/onyx_if.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libvpx/vp8/encoder/onyx_if.c b/libvpx/vp8/encoder/onyx_if.c
index df5bcf688..f3ff77e71 100644
--- a/libvpx/vp8/encoder/onyx_if.c
+++ b/libvpx/vp8/encoder/onyx_if.c
@@ -1514,6 +1514,14 @@ void vp8_change_config(VP8_COMP *cpi, VP8_CONFIG *oxcf)
     last_h = cpi->oxcf.Height;
     prev_number_of_layers = cpi->oxcf.number_of_layers;
 
+#if CONFIG_MULTITHREAD
+    if (cpi->initial_width) {
+      // TODO(https://crbug.com/1486441): Allow changing thread counts; the
+      // allocation is done once in vp8_create_compressor().
+      oxcf->multi_threaded = cpi->oxcf.multi_threaded;
+    }
+#endif
+
     cpi->oxcf = *oxcf;
 
     switch (cpi->oxcf.Mode)
