[FFmpeg-devel] [PATCH] lavc/pthread_frame: always transfer stashed hwaccel state

[FFmpeg-devel] [PATCH] lavc/pthread_frame: always transfer stashed hwaccel state

[Anton Khirnov]

Fixes assertion failures after avcodec_flush_buffers(), where
stashed hwaccel state is present, but prev_thread is NULL.

Found-by: Wang Bin <wbsecg1@gmail.com>
---
 libavcodec/pthread_frame.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/libavcodec/pthread_frame.c b/libavcodec/pthread_frame.c
index 066269621d..f8fddc5e4d 100644
--- a/libavcodec/pthread_frame.c
+++ b/libavcodec/pthread_frame.c
@@ -459,14 +459,14 @@ static int submit_packet(PerThreadContext *p, AVCodecContext *user_avctx,
             pthread_mutex_unlock(&p->mutex);
             return err;
         }
-
-        /* transfer hwaccel state stashed from previous thread, if any */
-        av_assert0(!p->avctx->hwaccel);
-        FFSWAP(const AVHWAccel*, p->avctx->hwaccel,                     fctx->stash_hwaccel);
-        FFSWAP(void*,            p->avctx->hwaccel_context,             fctx->stash_hwaccel_context);
-        FFSWAP(void*,            p->avctx->internal->hwaccel_priv_data, fctx->stash_hwaccel_priv);
     }
 
+    /* transfer the stashed hwaccel state, if any */
+    av_assert0(!p->avctx->hwaccel);
+    FFSWAP(const AVHWAccel*, p->avctx->hwaccel,                     fctx->stash_hwaccel);
+    FFSWAP(void*,            p->avctx->hwaccel_context,             fctx->stash_hwaccel_context);
+    FFSWAP(void*,            p->avctx->internal->hwaccel_priv_data, fctx->stash_hwaccel_priv);
+
     av_packet_unref(p->avpkt);
     ret = av_packet_ref(p->avpkt, avpkt);
     if (ret < 0) {
-- 
2.35.1

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Re: [FFmpeg-devel] [PATCH] lavc/pthread_frame: always transfer stashed hwaccel state

[Wang Bin]

Anton Khirnov <anton@khirnov.net> 于2022年9月19日周一 21:22写道：

> Fixes assertion failures after avcodec_flush_buffers(), where
> stashed hwaccel state is present, but prev_thread is NULL.
>
> Found-by: Wang Bin <wbsecg1@gmail.com>
> ---
>  libavcodec/pthread_frame.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/libavcodec/pthread_frame.c b/libavcodec/pthread_frame.c
> index 066269621d..f8fddc5e4d 100644
> --- a/libavcodec/pthread_frame.c
> +++ b/libavcodec/pthread_frame.c
> @@ -459,14 +459,14 @@ static int submit_packet(PerThreadContext *p,
> AVCodecContext *user_avctx,
>              pthread_mutex_unlock(&p->mutex);
>              return err;
>          }
> -
> -        /* transfer hwaccel state stashed from previous thread, if any */
> -        av_assert0(!p->avctx->hwaccel);
> -        FFSWAP(const AVHWAccel*, p->avctx->hwaccel,
>  fctx->stash_hwaccel);
> -        FFSWAP(void*,            p->avctx->hwaccel_context,
>  fctx->stash_hwaccel_context);
> -        FFSWAP(void*,            p->avctx->internal->hwaccel_priv_data,
> fctx->stash_hwaccel_priv);
>      }
>
> +    /* transfer the stashed hwaccel state, if any */
> +    av_assert0(!p->avctx->hwaccel);
> +    FFSWAP(const AVHWAccel*, p->avctx->hwaccel,
>  fctx->stash_hwaccel);
> +    FFSWAP(void*,            p->avctx->hwaccel_context,
>  fctx->stash_hwaccel_context);
> +    FFSWAP(void*,            p->avctx->internal->hwaccel_priv_data,
> fctx->stash_hwaccel_priv);
> +
>      av_packet_unref(p->avpkt);
>      ret = av_packet_ref(p->avpkt, avpkt);
>      if (ret < 0) {
> --
> 2.35.1
>
>
The patch works as expected. I've tested all hwaccels. Thanks.

Regards
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