[FFmpeg-cvslog] libswscale/options: Add parent_log_context_offset to AVClass

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Sat Sep 18 04:46:45 2021 +0200| [a1255a350d4629ca9f0073289ae8e2862aa0d9e1] | committer: Andreas Rheinhardt

libswscale/options: Add parent_log_context_offset to AVClass

This allows to associate log messages from slice contexts to
the user-visible SwsContext.

Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a1255a350d4629ca9f0073289ae8e2862aa0d9e1
---

 libswscale/options.c          | 1 +
 libswscale/swscale_internal.h | 2 ++
 libswscale/utils.c            | 2 ++
 3 files changed, 5 insertions(+)

diff --git a/libswscale/options.c b/libswscale/options.c
index 4b71a23e37..f6ea9e1f9d 100644
--- a/libswscale/options.c
+++ b/libswscale/options.c
@@ -91,6 +91,7 @@ const AVClass ff_sws_context_class = {
     .class_name = "SWScaler",
     .item_name  = sws_context_to_name,
     .option     = swscale_options,
+    .parent_log_context_offset = OFFSET(parent),
     .category   = AV_CLASS_CATEGORY_SWSCALER,
     .version    = LIBAVUTIL_VERSION_INT,
 };
diff --git a/libswscale/swscale_internal.h b/libswscale/swscale_internal.h
index fbfc08a89f..0d60dd2e6f 100644
--- a/libswscale/swscale_internal.h
+++ b/libswscale/swscale_internal.h
@@ -301,6 +301,8 @@ typedef struct SwsContext {
      */
     const AVClass *av_class;
 
+    struct SwsContext *parent;
+
     AVSliceThread      *slicethread;
     struct SwsContext **slice_ctx;
     int                *slice_err;
diff --git a/libswscale/utils.c b/libswscale/utils.c
index 25051ead72..84a29c4dc7 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -1214,6 +1214,8 @@ static int context_init_threaded(SwsContext *c,
         if (!c->slice_ctx[i])
             return AVERROR(ENOMEM);
 
+        c->slice_ctx[i]->parent = c;
+
         ret = av_opt_copy((void*)c->slice_ctx[i], (void*)c);
         if (ret < 0)
             return ret;