Add GStreamer based VVdeC decoder

gst-vvdec is a GStreamer element that uses VVdeC via Rust bindings.

As of now, it has conformance results (243/282) close to vvdecapp
(250/282), with the failures in addition being:
- Grayscale: element and videocodectestsink don't support it yet
- Interlaced: not supported by the element yet

README.md

@@ -8,7 +8,7 @@ application that runs a number of test suites with the supported decoders. Its
 purpose is to check different decoder implementations against known test suites
 with known and proven results. It was originally designed to check the
 conformance of H.265/HEVC decoders, but it also supports H.264/AVC, H.266/VVC,
-VP8, VP9, AV1 and AAC. It can easily be extended to add more decoders and test 
+VP8, VP9, AV1 and AAC. It can easily be extended to add more decoders and test
 suites.
 
 ## Table of Contents
@@ -248,6 +248,7 @@ AAC
     ISO-MPEG4-AAC: ISO MPEG4 AAC reference decoder... ✔️
 
 H266
+    GStreamer-H.266-VVdeC-Gst1.0: GStreamer H.266 VVdeC decoder for GStreamer 1.0... ✔
     VVdeC-H266: VVdeC H.266/VVC reference decoder... ✔️
 
 ```
@@ -294,6 +295,7 @@ H266
 - Fluendo's proprietary decoders for H.264/AVC and H.265/HEVC that are included
   in [Fluendo Codec
   Pack](https://fluendo.com/en/products/enterprise/fluendo-codec-pack/).
+- [GStreamer's](https://gstreamer.freedesktop.org/) for H.266/VVC.
 - [GStreamer's](https://gstreamer.freedesktop.org/) for H.265/HEVC.
 - [GStreamer's](https://gstreamer.freedesktop.org/) for H.264/AVC.
 - [FFmpeg's](https://FFmpeg.org) for H.265/HEVC.
@@ -512,7 +514,7 @@ results are obtained, we can do the following procedure:
    gstreamer1.0-tools gstreamer1.0-libav gstreamer1.0-plugins-bad ffmpeg
    vpx-tools aom-tools
    ```
-   
+
 5. Create a new PR with your changes.
 6. Make sure the GitHub Actions is running and its result is a pass.
 

fluster/decoders/gstreamer.py

@@ -45,6 +45,8 @@ def gst_element_exists(element: str) -> bool:
 def output_format_to_gst(output_format: OutputFormat) -> str:
     """Return GStreamer pixel format"""
     mapping = {
+        OutputFormat.GRAY: "GRAY8",
+        OutputFormat.GRAY16LE: "GRAY16_LE",
         OutputFormat.YUV420P: "I420",
         OutputFormat.YUV422P: "Y42B",
         OutputFormat.YUV420P10LE: "I420_10LE",
@@ -56,7 +58,8 @@ def output_format_to_gst(output_format: OutputFormat) -> str:
         OutputFormat.YUV444P12LE: "Y444_12LE",
     }
     if output_format not in mapping:
-        raise Exception(f"No matching output format found in GStreamer for {output_format}")
+        raise Exception(
+            f"No matching output format found in GStreamer for {output_format}")
     return mapping[output_format]
 
 
@@ -597,6 +600,15 @@ class GStreamerNvdecSLVP9Gst10Decoder(GStreamer10Video):
     hw_acceleration = True
 
 
+@register_decoder
+class GStreamerVVdeCH266Decoder(GStreamer10Video):
+    '''GStreamer H.266/VVC VVdeC decoder implementation for GStreamer 1.0'''
+    codec = Codec.H266
+    decoder_bin = ' h266parse ! vvdec '
+    api = 'VVdeC'
+    hw_acceleration = False
+
+
 @register_decoder
 class FluendoH265Gst10Decoder(GStreamer10Video):
     '''Fluendo H.265 software decoder implementation for GStreamer 1.0'''
@@ -747,6 +759,7 @@ class FluendoFluVAH264DecGst10Decoder(GStreamer10Video):
 @register_decoder
 class FluendoFluAACDecGst10Decoder(GStreamer10Audio):
     '''Fluendo AAC plugin decoder for GStreamer 1.0'''
+
     def __init__(self) -> None:
         self.codec = Codec.AAC
         self.decoder_bin = 'fluaacdec trim=0'