avviddec: Make sure to use a buffer pool with the correct width/height configured on it for pushing buffers downstream

If downstream does not provide a (usable) pool, we would use our internal
pool. But the internal pool might be configured with a different width/height
because of padding, which then will cause problems if we push buffers from it
directly downstream.
Instead create a new pool if the width/height is different.

This prevents crashes with vaapisink and d3dvideosink for example.

Based on the debugging results and discussions with
Nicolas Dufresne <nicolas.dufresne@collabora.com>

https://bugzilla.gnome.org/show_bug.cgi?id=758344

1 files changed, 13 insertions, 1 deletions

diff --git a/ext/libav/gstavviddec.c b/ext/libav/gstavviddec.c
index 5497409..8c606ff 100644
--- a/ext/libav/gstavviddec.c
+++ b/ext/libav/gstavviddec.c
@@ -1416,6 +1416,16 @@ gst_ffmpegviddec_video_frame (GstFFMpegVidDec * ffmpegdec,
     *ret = get_output_buffer (ffmpegdec, out_frame);
     gst_buffer_unref (tmp);
   }
+#ifndef G_DISABLE_ASSERT
+  else {
+    GstVideoMeta *vmeta = gst_buffer_get_video_meta (out_frame->output_buffer);
+    if (vmeta) {
+      GstVideoInfo *info = &ffmpegdec->output_state->info;
+      g_assert (vmeta->width == GST_VIDEO_INFO_WIDTH (info));
+      g_assert (vmeta->height == GST_VIDEO_INFO_HEIGHT (info));
+    }
+  }
+#endif
   gst_object_unref (pool);
 
   if (G_UNLIKELY (*ret != GST_FLOW_OK))
@@ -1881,7 +1891,9 @@ gst_ffmpegviddec_decide_allocation (GstVideoDecoder * decoder, GstQuery * query)
     }
   }
 
-  if (have_videometa && ffmpegdec->internal_pool) {
+  if (have_videometa && ffmpegdec->internal_pool
+      && ffmpegdec->pool_width == state->info.width
+      && ffmpegdec->pool_height == state->info.height) {
     update_pool = TRUE;
     gst_object_unref (pool);
     pool = gst_object_ref (ffmpegdec->internal_pool);