[FFmpeg-cvslog] avcodec/pthread_frame: Only set PerThreadContext* when frame-threading

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Thu Sep 14 18:30:07 2023 +0200| [f9b6e3e48d2544a448e305f7aa43fe7310ecb1d0] | committer: Andreas Rheinhardt

avcodec/pthread_frame: Only set PerThreadContext* when frame-threading

Otherwise the thread_ctx pointer might be NULL or point to
a SliceThreadContext.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f9b6e3e48d2544a448e305f7aa43fe7310ecb1d0
---

 libavcodec/pthread_frame.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/libavcodec/pthread_frame.c b/libavcodec/pthread_frame.c
index 4973d64550..b53fb54906 100644
--- a/libavcodec/pthread_frame.c
+++ b/libavcodec/pthread_frame.c
@@ -644,10 +644,12 @@ void ff_thread_await_progress(const ThreadFrame *f, int n, int field)
 }
 
 void ff_thread_finish_setup(AVCodecContext *avctx) {
-    PerThreadContext *p = avctx->internal->thread_ctx;
+    PerThreadContext *p;
 
     if (!(avctx->active_thread_type&FF_THREAD_FRAME)) return;
 
+    p = avctx->internal->thread_ctx;
+
     p->hwaccel_threadsafe = avctx->hwaccel &&
                             (ffhwaccel(avctx->hwaccel)->caps_internal & HWACCEL_CAP_THREAD_SAFE);
 
@@ -956,11 +958,12 @@ void ff_thread_flush(AVCodecContext *avctx)
 
 int ff_thread_can_start_frame(AVCodecContext *avctx)
 {
-    PerThreadContext *p = avctx->internal->thread_ctx;
-
-    if ((avctx->active_thread_type&FF_THREAD_FRAME) && atomic_load(&p->state) != STATE_SETTING_UP &&
+    if ((avctx->active_thread_type & FF_THREAD_FRAME) &&
         ffcodec(avctx->codec)->update_thread_context) {
-        return 0;
+        PerThreadContext *p = avctx->internal->thread_ctx;
+
+        if (atomic_load(&p->state) != STATE_SETTING_UP)
+            return 0;
     }
 
     return 1;