gstreamer1.0-plugins-bad: fix buffer allocation fail for v4l2codecs

There is a bug in GStreamer 1.22 that prevents video playback when
some of the v4l2codecs are paired with sinks that do not support
GstVideoMeta. This is the case of the Qt 6.9 sink used by some
of the Qt components.

For example, when the v4l2codecs-vp8dec decoder is paired with
QMediaPlayer, video playback fails to start with the following error:

  WARN   videodecoder gstvideodecoder.c:4409:gst_video_decoder_negotiate_pool: Subclass failed to decide allocation
  ERROR  videodecoder gstvideodecoder.c:4635:gst_video_decoder_allocate_output_buffer: Failed to allocate the buffer..
  WARN   videodecoder gstvideodecoder.c:4409:gst_video_decoder_negotiate_pool: Subclass failed to decide allocation
  WARN  matroskademux matroska-demux.c:6131:gst_matroska_demux_loop: error: Internal data stream error.
  WARN  matroskademux matroska-demux.c:6131:gst_matroska_demux_loop: error: streaming stopped, reason not-negotiated (-4)

This problem is already fixed in GStreamer 1.24, so backport the fix.
This fixes the buffer allocation failure for H.264, H.265, and VP8.

CC: Steve Sakoman <steve@sakoman.com>
CC: Anuj Mittal <anuj.mittal@intel.com>
(From OE-Core rev: 1be0de000bb852f1acc9644c1cb702336d7fdd61)

Signed-off-by: Daniel Semkowicz <dse@thaumatec.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 88 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad/0005-v4l2codecs-Always-chain-up-to-parent-decide_allocati.patch b/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad/0005-v4l2codecs-Always-chain-up-to-parent-decide_allocati.patch
new file mode 100644
index 0000000000..8906b55082
--- /dev/null
+++ b/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad/0005-v4l2codecs-Always-chain-up-to-parent-decide_allocati.patch
@@ -0,0 +1,87 @@
+From 4e96cc4df0b6807cb487368afca64e022078ed6a Mon Sep 17 00:00:00 2001
+From: James Cowgill <james.cowgill@blaize.com>
+Date: Sun, 14 May 2023 13:23:17 +0100
+Subject: [PATCH] v4l2codecs: Always chain up to parent decide_allocation
+ function
+
+The `gst_video_decoder_negotiate_pool` function expects the
+`decide_allocation` function to always provide a pool and will fail to
+negotiate if the pool is missing. If we return immediately (even if we
+don't need to do anything special) negotiation will fail if the
+downstream element does not propose a pool.
+
+Fix by chaining up to the default `decide_allocation` function which
+adds a fallback pool if one was not already proposed.
+
+Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4630>
+Upstream-Status: Backport [https://gitlab.freedesktop.org/gstreamer/gstreamer/-/commit/70ff80a873d8202329df1731c06f1bfed464ad2a]
+Signed-off-by: Daniel Semkowicz <dse@thaumatec.com>
+---
+ sys/v4l2codecs/gstv4l2codech264dec.c | 3 ++-
+ sys/v4l2codecs/gstv4l2codech265dec.c | 3 ++-
+ sys/v4l2codecs/gstv4l2codecvp8dec.c  | 3 ++-
+ 3 files changed, 6 insertions(+), 3 deletions(-)
+
+diff --git a/sys/v4l2codecs/gstv4l2codech264dec.c b/sys/v4l2codecs/gstv4l2codech264dec.c
+index 1a6b144e9b..bd9041533b 100644
+--- a/sys/v4l2codecs/gstv4l2codech264dec.c
++++ b/sys/v4l2codecs/gstv4l2codech264dec.c
+@@ -417,7 +417,7 @@ gst_v4l2_codec_h264_dec_decide_allocation (GstVideoDecoder * decoder,
+   /* If we are streaming here, then it means there is nothing allocation
+    * related in the new state and allocation can be ignored */
+   if (self->streaming)
+-    return TRUE;
++    goto no_internal_changes;
+ 
+   self->has_videometa = gst_query_find_allocation_meta (query,
+       GST_VIDEO_META_API_TYPE, NULL);
+@@ -452,6 +452,7 @@ gst_v4l2_codec_h264_dec_decide_allocation (GstVideoDecoder * decoder,
+ 
+   self->src_pool = gst_v4l2_codec_pool_new (self->src_allocator, &self->vinfo);
+ 
++no_internal_changes:
+   /* Our buffer pool is internal, we will let the base class create a video
+    * pool, and use it if we are running out of buffers or if downstream does
+    * not support GstVideoMeta */
+diff --git a/sys/v4l2codecs/gstv4l2codech265dec.c b/sys/v4l2codecs/gstv4l2codech265dec.c
+index 8d70d05220..3f0c08d6a4 100644
+--- a/sys/v4l2codecs/gstv4l2codech265dec.c
++++ b/sys/v4l2codecs/gstv4l2codech265dec.c
+@@ -446,7 +446,7 @@ gst_v4l2_codec_h265_dec_decide_allocation (GstVideoDecoder * decoder,
+   guint min = 0;
+ 
+   if (self->streaming)
+-    return TRUE;
++    goto no_internal_changes;
+ 
+   self->has_videometa = gst_query_find_allocation_meta (query,
+       GST_VIDEO_META_API_TYPE, NULL);
+@@ -465,6 +465,7 @@ gst_v4l2_codec_h265_dec_decide_allocation (GstVideoDecoder * decoder,
+       GST_PAD_SRC, self->min_pool_size + min + 1);
+   self->src_pool = gst_v4l2_codec_pool_new (self->src_allocator, &self->vinfo);
+ 
++no_internal_changes:
+   /* Our buffer pool is internal, we will let the base class create a video
+    * pool, and use it if we are running out of buffers or if downstream does
+    * not support GstVideoMeta */
+diff --git a/sys/v4l2codecs/gstv4l2codecvp8dec.c b/sys/v4l2codecs/gstv4l2codecvp8dec.c
+index ba63a029df..bdea1fdf76 100644
+--- a/sys/v4l2codecs/gstv4l2codecvp8dec.c
++++ b/sys/v4l2codecs/gstv4l2codecvp8dec.c
+@@ -284,7 +284,7 @@ gst_v4l2_codec_vp8_dec_decide_allocation (GstVideoDecoder * decoder,
+   guint num_bitstream;
+ 
+   if (self->streaming)
+-    return TRUE;
++    goto no_internal_changes;
+ 
+   self->has_videometa = gst_query_find_allocation_meta (query,
+       GST_VIDEO_META_API_TYPE, NULL);
+@@ -319,6 +319,7 @@ gst_v4l2_codec_vp8_dec_decide_allocation (GstVideoDecoder * decoder,
+ 
+   self->src_pool = gst_v4l2_codec_pool_new (self->src_allocator, &self->vinfo);
+ 
++no_internal_changes:
+   /* Our buffer pool is internal, we will let the base class create a video
+    * pool, and use it if we are running out of buffers or if downstream does
+    * not support GstVideoMeta */
diff --git a/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad_1.22.12.bb b/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad_1.22.12.bb
index e4fa2a412f..f6d0711bd8 100644
--- a/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad_1.22.12.bb
+++ b/meta/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad_1.22.12.bb
@@ -9,6 +9,7 @@ SRC_URI = "https://gstreamer.freedesktop.org/src/gst-plugins-bad/gst-plugins-bad
            file://0001-fix-maybe-uninitialized-warnings-when-compiling-with.patch \
            file://0002-avoid-including-sys-poll.h-directly.patch \
            file://0004-opencv-resolve-missing-opencv-data-dir-in-yocto-buil.patch \
+           file://0005-v4l2codecs-Always-chain-up-to-parent-decide_allocati.patch \
            file://CVE-2025-3887-1.patch \
            file://CVE-2025-3887-2.patch \
            "