[Spice-devel] [PATCH v4] channel-display-gst: Use h/w based decoders with Intel GPUs if possible (v4)
Frediano Ziglio
freddy77 at gmail.com
Tue Oct 31 14:34:29 UTC 2023
Hi Vivek,
I finally came up with something better.
See https://gitlab.freedesktop.org/fziglio/spice-gtk/-/commits/hw_decoding/,
it contains
- https://gitlab.freedesktop.org/fziglio/spice-gtk/-/commit/52d8622bf620f2ad47d6f001926ed918d50d30cd,
fix some leaks, not due to your patch but good for testing, opened a
reparate PR at https://gitlab.freedesktop.org/spice/spice-gtk/-/merge_requests/123;
- https://gitlab.freedesktop.org/fziglio/spice-gtk/-/commit/de6d228349607d8d0d711f5c2a11f791167c8c25
required update for spice-common submodule;
- https://gitlab.freedesktop.org/fziglio/spice-gtk/-/commit/e481a2b84e3d02e5d0c38ee5ae8d268fba15dc77
fix dangling pointers in free_pipeline (remove some warnings running
your patch);
- https://gitlab.freedesktop.org/fziglio/spice-gtk/-/commit/8d59e88e88553497049a9fc380cac7395225bc75
(fixup) the proposed change in the previous mail to avoid some leaks
and memory errors;
- https://gitlab.freedesktop.org/fziglio/spice-gtk/-/commit/c01fa619b836b413fecd594a97a03cbf4b655b04
(fixup) really minor style change;
- https://gitlab.freedesktop.org/fziglio/spice-gtk/-/commit/22c032c67528e0899b6e2faf56ffa9584c208755
the fallback patch I described in previous email, turned out it was
easier than expected.
Regards,
Frediano
Il giorno dom 29 ott 2023 alle ore 20:32 Frediano Ziglio
<freddy77 at gmail.com> ha scritto:
>
> Il giorno mar 17 ott 2023 alle ore 08:46 Vivek Kasireddy
> <vivek.kasireddy at intel.com> ha scritto:
> >
> > We first try to detect if an Intel GPU is available (by looking into
> > udev's database) and then probe Gstreamer's registry cache to see
> > if there is h/w based decoder (element) available for the incoming
> > video codec format. If both these conditions are satisfied (i.e,
> > Intel Media SDK Gstreamer plugin (libgstmsdk.so) and associated
> > libraries are properly installed), we then create a simple decode
> > pipeline using appropriate h/w based decoder and post-processor
> > elements instead of relying on playbin -- which may not be able to
> > auto-select these elements.
> >
> > For example, if the incoming codec format is h264, we then create
> > a pipeline using msdkh264dec and vaapipostproc elements instead of
> > avdec_h264 and videoconvert.
> >
> > v2: (addressed some review comments from Frediano)
> > - s/gboolean/bool, s/TRUE/true, s/FALSE/false
> > - Used a single cleanup label instead of multiple while instantiating
> > elements
> > - Moved the code that launches the Gst pipeline into a helper that
> > is used while trying h/w based plugins
> >
> > v3:
> > - Updated the patch to reflect the new signature and return value of
> > spice_udev_detect_gpu().
> >
> > v4:
> > - Include the string "_hw_" in the function that finds best h/w plugins
> > - Change type and determine plugins array length using G_N_ELEMENTS
> > - Free vpp_name immediately after using it to prevent leak
> > - Rebase on master
> >
> > Cc: Frediano Ziglio <freddy77 at gmail.com>
> > Cc: Gerd Hoffmann <kraxel at redhat.com>
> > Cc: Marc-André Lureau <marcandre.lureau at redhat.com>
> > Cc: Dongwon Kim <dongwon.kim at intel.com>
> > Signed-off-by: Vivek Kasireddy <vivek.kasireddy at intel.com>
> > Signed-off-by: Hazwan Arif Mazlan <hazwan.arif.mazlan at intel.com>
> > Signed-off-by: Jin Chung Teng <jin.chung.teng at intel.com>
> > ---
> > src/channel-display-gst.c | 217 ++++++++++++++++++++++++++++++++++----
> > 1 file changed, 195 insertions(+), 22 deletions(-)
> >
>
> Hi,
> the patch seems good.
>
> Not sure what I did with my system but I'm not able to test it very
> well. The system keeps complaining about some issue with the format.
> I wanted to add a patch for compatibility in case the server is
> sending some profile not supported by H/W decoder (mainly saving first
> encoded frames till an error or an output frame and try with S/W
> decoder) but I got stuck with my system errors.
>
> In the meantime I manage to find the memory issue you had that caused:
>
> (remote-viewer:2272): GStreamer-CRITICAL **: 18:30:37.263:
> Trying to dispose object "appsink26", but it still has a parent "pipeline28".
> You need to let the parent manage the object instead of unreffing the
> object directly.
>
> The reason is due to a missing reference to the sink, I fixed it and
> changed the order of free (reverse of allocations), see
>
> diff --git a/src/channel-display-gst.c b/src/channel-display-gst.c
> index de606b56..82c500c8 100644
> --- a/src/channel-display-gst.c
> +++ b/src/channel-display-gst.c
> @@ -628,7 +628,7 @@ static bool try_intel_hw_pipeline(SpiceGstDecoder *decoder)
> "drop", FALSE,
> NULL);
> gst_caps_unref(sink_caps);
> - decoder->appsink = GST_APP_SINK(sink);
> + decoder->appsink = GST_APP_SINK(gst_object_ref(sink));
>
> if (hand_pipeline_to_widget(decoder->base.stream,
> GST_PIPELINE(pipeline))) {
> @@ -642,6 +642,8 @@ static bool try_intel_hw_pipeline(SpiceGstDecoder *decoder)
> if (!gst_element_link_many(src, parser, hw_decoder, vpp,
> sink, NULL)) {
> spice_warning("error linking elements");
> + /* ownership moved to pipeline, don't unreference these */
> + src = parser = hw_decoder = vpp = sink = NULL;
> goto err;
> }
> } else {
> @@ -649,6 +651,8 @@ static bool try_intel_hw_pipeline(SpiceGstDecoder *decoder)
> vpp, sink, NULL);
> if (!gst_element_link_many(src, hw_decoder, vpp, sink, NULL)) {
> spice_warning("error linking elements");
> + /* ownership moved to pipeline, don't unreference these */
> + src = hw_decoder = vpp = sink = NULL;
> goto err;
> }
> }
> @@ -657,20 +661,31 @@ static bool
> try_intel_hw_pipeline(SpiceGstDecoder *decoder)
> return launch_pipeline(decoder);
>
> err:
> - if (src) {
> - gst_object_unref(src);
> + if (decoder->appsink) {
> + gst_object_unref(decoder->appsink);
> + decoder->appsink = NULL;
> }
> - if (sink) {
> - gst_object_unref(sink);
> + if (decoder->appsrc) {
> + gst_object_unref(decoder->appsrc);
> + decoder->appsrc = NULL;
> }
> - if (use_parser) {
> - gst_object_unref(parser);
> + if (pipeline) {
> + gst_object_unref(pipeline);
> + }
> + if (vpp) {
> + gst_object_unref(vpp);
> }
> if (hw_decoder) {
> gst_object_unref(hw_decoder);
> }
> - if (vpp) {
> - gst_object_unref(vpp);
> + if (parser) {
> + gst_object_unref(parser);
> + }
> + if (sink) {
> + gst_object_unref(sink);
> + }
> + if (src) {
> + gst_object_unref(src);
> }
> return false;
> }
> --
>
> Frediano
>
> > diff --git a/src/channel-display-gst.c b/src/channel-display-gst.c
> > index 5c9927b..de606b5 100644
> > --- a/src/channel-display-gst.c
> > +++ b/src/channel-display-gst.c
> > @@ -20,6 +20,7 @@
> > #include "spice-common.h"
> > #include "spice-channel-priv.h"
> > #include "common/recorder.h"
> > +#include "common/udev.h"
> >
> > #include "channel-display-priv.h"
> >
> > @@ -489,13 +490,205 @@ deep_element_added_cb(GstBin *pipeline, GstBin *bin, GstElement *element,
> > }
> > }
> >
> > -static gboolean create_pipeline(SpiceGstDecoder *decoder)
> > +static gchar *find_best_hw_plugin(const gchar *dec_name)
> > +{
> > + static const char plugins[][8] = {"msdk", "va", "vaapi"};
> > + GstRegistry *registry;
> > + GstPluginFeature *feature;
> > + gchar *feature_name;
> > + int i;
> > +
> > + registry = gst_registry_get();
> > + if (!registry) {
> > + return NULL;
> > + }
> > +
> > + for (i = 0; i < G_N_ELEMENTS(plugins); i++) {
> > + feature_name = !dec_name ? g_strconcat(plugins[i], "postproc", NULL) :
> > + g_strconcat(plugins[i], dec_name, "dec", NULL);
> > + feature = gst_registry_lookup_feature(registry, feature_name);
> > + if (!feature) {
> > + g_free(feature_name);
> > + feature_name = NULL;
> > + continue;
> > + }
> > + gst_object_unref(feature);
> > + break;
> > + }
> > + return feature_name;
> > +}
> > +
> > +static bool launch_pipeline(SpiceGstDecoder *decoder)
> > {
> > GstBus *bus;
> > +
> > + if (decoder->appsink) {
> > + GstAppSinkCallbacks appsink_cbs = { NULL };
> > + appsink_cbs.new_sample = new_sample;
> > + gst_app_sink_set_callbacks(decoder->appsink, &appsink_cbs, decoder, NULL);
> > + gst_app_sink_set_max_buffers(decoder->appsink, MAX_DECODED_FRAMES);
> > + gst_app_sink_set_drop(decoder->appsink, FALSE);
> > + }
> > + bus = gst_pipeline_get_bus(GST_PIPELINE(decoder->pipeline));
> > + gst_bus_add_watch(bus, handle_pipeline_message, decoder);
> > + gst_object_unref(bus);
> > +
> > + decoder->clock = gst_pipeline_get_clock(GST_PIPELINE(decoder->pipeline));
> > +
> > + if (gst_element_set_state(decoder->pipeline, GST_STATE_PLAYING) == GST_STATE_CHANGE_FAILURE) {
> > + SPICE_DEBUG("GStreamer error: Unable to set the pipeline to the playing state.");
> > + free_pipeline(decoder);
> > + return false;
> > + }
> > +
> > + return true;
> > +}
> > +
> > +static bool try_intel_hw_pipeline(SpiceGstDecoder *decoder)
> > +{
> > + GstElement *pipeline = NULL, *src = NULL, *sink = NULL;
> > + GstElement *parser = NULL, *hw_decoder = NULL, *vpp = NULL;
> > + GstCaps *src_caps, *sink_caps;
> > + int codec_type = decoder->base.codec_type;
> > + const gchar *dec_name = gst_opts[codec_type].name;
> > + gchar *hw_dec_name, *vpp_name, *parser_name;
> > + gboolean use_parser;
> > +
> > + use_parser = codec_type == SPICE_VIDEO_CODEC_TYPE_H264 ||
> > + codec_type == SPICE_VIDEO_CODEC_TYPE_H265;
> > +
> > + src = gst_element_factory_make("appsrc", NULL);
> > + if (!src) {
> > + spice_warning("error upon creation of 'appsrc' element");
> > + return false;
> > + }
> > + sink = gst_element_factory_make("appsink", NULL);
> > + if (!sink) {
> > + spice_warning("error upon creation of 'appsink' element");
> > + goto err;
> > + }
> > +
> > + if (use_parser) {
> > + parser_name = g_strconcat(dec_name, "parse", NULL);
> > + parser = gst_element_factory_make(parser_name, NULL);
> > + g_free(parser_name);
> > + if (!parser) {
> > + spice_warning("error upon creation of 'parser' element");
> > + goto err;
> > + }
> > + }
> > +
> > + hw_dec_name = find_best_hw_plugin(dec_name);
> > + if (!hw_dec_name) {
> > + spice_warning("error finding suitable plugin for decode");
> > + goto err;
> > + }
> > + hw_decoder = gst_element_factory_make(hw_dec_name, NULL);
> > + g_free(hw_dec_name);
> > + if (!hw_decoder) {
> > + spice_warning("error upon creation of 'decoder' element");
> > + goto err;
> > + }
> > + vpp_name = find_best_hw_plugin(NULL);
> > + if (!vpp_name) {
> > + spice_warning("error finding suitable plugin for postproc");
> > + goto err;
> > + }
> > + vpp = gst_element_factory_make(vpp_name, NULL);
> > + g_free(vpp_name);
> > + if (!vpp) {
> > + spice_warning("error upon creation of 'vpp' element");
> > + goto err;
> > + }
> > + g_object_set(vpp,
> > + "format", GST_VIDEO_FORMAT_BGRx,
> > + NULL);
> > +
> > + pipeline = gst_pipeline_new(NULL);
> > + if (!pipeline) {
> > + spice_warning("error upon creation of 'pipeline' element");
> > + goto err;
> > + }
> > +
> > + src_caps = gst_caps_from_string(gst_opts[codec_type].dec_caps);
> > + g_object_set(src,
> > + "caps", src_caps,
> > + "is-live", TRUE,
> > + "format", GST_FORMAT_TIME,
> > + "max-bytes", G_GINT64_CONSTANT(0),
> > + "block", TRUE,
> > + NULL);
> > + gst_caps_unref(src_caps);
> > + decoder->appsrc = GST_APP_SRC(gst_object_ref(src));
> > +
> > + sink_caps = gst_caps_from_string("video/x-raw,format=BGRx");
> > + g_object_set(sink,
> > + "caps", sink_caps,
> > + "sync", FALSE,
> > + "drop", FALSE,
> > + NULL);
> > + gst_caps_unref(sink_caps);
> > + decoder->appsink = GST_APP_SINK(sink);
> > +
> > + if (hand_pipeline_to_widget(decoder->base.stream,
> > + GST_PIPELINE(pipeline))) {
> > + spice_warning("error handing pipeline to widget");
> > + goto err;
> > + }
> > +
> > + if (use_parser) {
> > + gst_bin_add_many(GST_BIN(pipeline), src, parser, hw_decoder,
> > + vpp, sink, NULL);
> > + if (!gst_element_link_many(src, parser, hw_decoder, vpp,
> > + sink, NULL)) {
> > + spice_warning("error linking elements");
> > + goto err;
> > + }
> > + } else {
> > + gst_bin_add_many(GST_BIN(pipeline), src, hw_decoder,
> > + vpp, sink, NULL);
> > + if (!gst_element_link_many(src, hw_decoder, vpp, sink, NULL)) {
> > + spice_warning("error linking elements");
> > + goto err;
> > + }
> > + }
> > +
> > + decoder->pipeline = pipeline;
> > + return launch_pipeline(decoder);
> > +
> > +err:
> > + if (src) {
> > + gst_object_unref(src);
> > + }
> > + if (sink) {
> > + gst_object_unref(sink);
> > + }
> > + if (use_parser) {
> > + gst_object_unref(parser);
> > + }
> > + if (hw_decoder) {
> > + gst_object_unref(hw_decoder);
> > + }
> > + if (vpp) {
> > + gst_object_unref(vpp);
> > + }
> > + return false;
> > +}
> > +
> > +static gboolean create_pipeline(SpiceGstDecoder *decoder)
> > +{
> > GstElement *playbin, *sink;
> > SpiceGstPlayFlags flags;
> > GstCaps *caps;
> > static bool playbin3_supported = true;
> > + GpuVendor vendor = spice_udev_detect_gpu(INTEL_VENDOR_ID);
> > +
> > + if (vendor == VENDOR_GPU_DETECTED ||
> > + vendor == VENDOR_GPU_UNKNOWN) {
> > + if (try_intel_hw_pipeline(decoder)) {
> > + return TRUE;
> > + }
> > + }
> >
> > playbin = playbin3_supported ?
> > gst_element_factory_make("playbin3", "playbin") : NULL;
> > @@ -571,29 +764,9 @@ static gboolean create_pipeline(SpiceGstDecoder *decoder)
> > g_warn_if_fail(decoder->appsrc == NULL);
> > decoder->pipeline = playbin;
> >
> > - if (decoder->appsink) {
> > - GstAppSinkCallbacks appsink_cbs = { NULL };
> > - appsink_cbs.new_sample = new_sample;
> > - gst_app_sink_set_callbacks(decoder->appsink, &appsink_cbs, decoder, NULL);
> > - gst_app_sink_set_max_buffers(decoder->appsink, MAX_DECODED_FRAMES);
> > - gst_app_sink_set_drop(decoder->appsink, FALSE);
> > - }
> > - bus = gst_pipeline_get_bus(GST_PIPELINE(decoder->pipeline));
> > - gst_bus_add_watch(bus, handle_pipeline_message, decoder);
> > - gst_object_unref(bus);
> > -
> > - decoder->clock = gst_pipeline_get_clock(GST_PIPELINE(decoder->pipeline));
> > -
> > - if (gst_element_set_state(decoder->pipeline, GST_STATE_PLAYING) == GST_STATE_CHANGE_FAILURE) {
> > - SPICE_DEBUG("GStreamer error: Unable to set the pipeline to the playing state.");
> > - free_pipeline(decoder);
> > - return FALSE;
> > - }
> > -
> > - return TRUE;
> > + return launch_pipeline(decoder);
> > }
> >
> > -
> > /* ---------- VideoDecoder's public API ---------- */
> >
> > static void spice_gst_decoder_reschedule(VideoDecoder *video_decoder)
> > --
> > 2.39.2
> >
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