[Spice-devel] [spice-gtk v1] display-gst: Improve h264 elements filtering

[Marc-André Lureau]

On Thu, Jul 13, 2017 at 5:33 AM, Victor Toso <victortoso at redhat.com> wrote:
> From: Victor Toso <me at victortoso.com>
>
> This patch fixes the avdec_h264 element not being present on
> gstvideo_has_codec() which get all decoder elements from GstRegistry
> and filter them on our GstCaps in order to get the ones for given
> codec.
>
> The issue is around the filtering. The current GstCaps for h264 is not
> consider a subset of avdec_h264's capabilites and that will fiter this
> element out of the list.
>
> The proposed solution for that is to set `subsetonly` parameter from
> gst_element_factory_list_filter() to false.
>
> While at it, the cap "stream-format=byte-stream" is less useful now
> because it isn't needed to play the stream - see 6fe88871240c53b8
>
> In my system, our debug shows:
> .. gstvideo_debug_available_decoders: From 228 video decoder elements,
> - 4 can handle caps   image/jpeg: jpegdec, nvdec, avdec_mjpeg, vaapijpegdec
> - 3 can handle caps  video/x-vp8: vaapidecodebin, vp8dec, avdec_vp8
> - 4 can handle caps video/x-h264: vaapidecodebin, avdec_h264, nvdec, vaapih264dec
> - 3 can handle caps  video/x-vp9: vaapidecodebin, vp9dec, avdec_vp9
>
> Signed-off-by: Victor Toso <victortoso at redhat.com>

ack (you may add the irc log to the commit imho)

> ---
>  src/channel-display-gst.c  | 2 +-
>  src/channel-display-priv.h | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/src/channel-display-gst.c b/src/channel-display-gst.c
> index 20d236a..1bd7df1 100644
> --- a/src/channel-display-gst.c
> +++ b/src/channel-display-gst.c
> @@ -647,7 +647,7 @@ gboolean gstvideo_has_codec(int codec_type)
>      }
>
>      caps = gst_caps_from_string(gst_opts[codec_type].dec_caps);
> -    codec_decoders = gst_element_factory_list_filter(all_decoders, caps, GST_PAD_SINK, TRUE);
> +    codec_decoders = gst_element_factory_list_filter(all_decoders, caps, GST_PAD_SINK, FALSE);
>      gst_caps_unref(caps);
>
>      if (codec_decoders == NULL) {
> diff --git a/src/channel-display-priv.h b/src/channel-display-priv.h
> index 04cb4d1..9bfd4ac 100644
> --- a/src/channel-display-priv.h
> +++ b/src/channel-display-priv.h
> @@ -181,7 +181,7 @@ static const struct {
>       * (hardcoded in spice-server), let's add it here to avoid the warning.
>       */
>      { SPICE_DISPLAY_CAP_CODEC_H264, "h264",
> -      "h264parse ! avdec_h264", "video/x-h264,stream-format=byte-stream" },
> +      "h264parse ! avdec_h264", "video/x-h264" },
>
>      /* SPICE_VIDEO_CODEC_TYPE_VP9 */
>      { SPICE_DISPLAY_CAP_CODEC_VP9, "vp9",
> --
> 2.13.0
>
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-- 
Marc-André Lureau