[Spice-devel] [PATCH v4 spice-streaming-agent 1/1] Adding gstreamer based plugin
Snir Sheriber
ssheribe at redhat.com
Wed Sep 5 14:44:52 UTC 2018
Hi,
Thanks for reviewing this, so most things i fixed in v5. just one comment.
On 08/17/2018 05:44 PM, Lukáš Hrázký wrote:
> Hi Snir,
>
> mostly nitpicks and style comments below...
>
> On Thu, 2018-08-16 at 17:59 +0300, Snir Sheriber wrote:
>> Gstreamer based plugin utilizing gstreamer elements to capture
>> screen from X, convert and encode into h264/h265/vp8/vp9/mjpeg stream
>> Configure with --enable-gstreamer, will be built as a separate plugin.
>>
>> The plugin was made for testing purposes, it was mainly tested with
>> the x264enc (h264 is the defualt codec) encoder.
>> To choose codec type use: '-c gst.codec=<h264/h265/vp8/vp9/mjpeg>'
>> To specify a certain plugin use: '-c gst.encoder=<plugin name>' in
>> addition to its matching codec type (gst.codec).
>>
>> Signed-off-by: Snir Sheriber <ssheribe at redhat.com>
>> Signed-off-by: Frediano Ziglio <fziglio at redhat.com>
>> ---
>> configure.ac | 15 ++
>> src/Makefile.am | 27 +++
>> src/gst-plugin.cpp | 466 +++++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 508 insertions(+)
>> create mode 100644 src/gst-plugin.cpp
>>
>> diff --git a/configure.ac b/configure.ac
>> index b59c447..b730bb2 100644
>> --- a/configure.ac
>> +++ b/configure.ac
>> @@ -60,6 +60,20 @@ AC_ARG_WITH(udevrulesdir,
>> )
>> AC_SUBST(UDEVRULESDIR)
>>
>> +AC_ARG_ENABLE(gstreamer,
>> + AS_HELP_STRING([--enable-gstreamer=@<:@auto/yes/no@:>@],
>> + [Enable GStreamer support]),,
>> + [enable_gstreamer="no"])
>> +if test "$enable_gstreamer" != "no"; then
>> + PKG_CHECK_MODULES(GST, [gstreamer-1.0 gstreamer-app-1.0], [enable_gstreamer=yes],
>> + [if test "$enable_gstreamer" = "yes"; then
>> + AC_MSG_ERROR([Gstreamer libs are missing])
>> + fi
>> + enable_gstreamer=no
>> + ])
>> +fi
>> +AM_CONDITIONAL([HAVE_GST],[test "$enable_gstreamer" = "yes"])
>> +
>> dnl ===========================================================================
>> dnl check compiler flags
>>
>> @@ -129,6 +143,7 @@ AC_MSG_NOTICE([
>> prefix: ${prefix}
>> C compiler: ${CC}
>> C++ compiler: ${CXX}
>> + Gstreamer plugin: ${enable_gstreamer}
>>
>> Now type 'make' to build $PACKAGE
>> ])
>> diff --git a/src/Makefile.am b/src/Makefile.am
>> index 40544ba..104da47 100644
>> --- a/src/Makefile.am
>> +++ b/src/Makefile.am
>> @@ -9,6 +9,9 @@ if ENABLE_TESTS
>> SUBDIRS = . unittests
>> endif
>>
>> +plugin_LTLIBRARIES =
>> +plugindir = $(pkglibdir)/plugins
>> +
>> AM_CPPFLAGS = \
>> -DSPICE_STREAMING_AGENT_PROGRAM \
>> -I$(top_srcdir)/include \
>> @@ -65,3 +68,27 @@ spice_streaming_agent_SOURCES = \
>> stream-port.cpp \
>> stream-port.hpp \
>> $(NULL)
>> +
>> +if HAVE_GST
>> +plugin_LTLIBRARIES += gst-plugin.la
>> +
>> +gst_plugin_la_LDFLAGS = \
>> + -module -avoid-version \
>> + $(RELRO_LDFLAGS) \
>> + $(NO_INDIRECT_LDFLAGS) \
>> + $(NULL)
>> +
>> +gst_plugin_la_LIBADD = \
>> + $(GST_LIBS) \
>> + $(NULL)
>> +
>> +gst_plugin_la_SOURCES = \
>> + gst-plugin.cpp \
>> + $(NULL)
>> +
>> +gst_plugin_la_CPPFLAGS = \
>> + -I$(top_srcdir)/include \
>> + $(SPICE_PROTOCOL_CFLAGS) \
>> + $(GST_CFLAGS) \
>> + $(NULL)
>> +endif
>> diff --git a/src/gst-plugin.cpp b/src/gst-plugin.cpp
>> new file mode 100644
>> index 0000000..028033e
>> --- /dev/null
>> +++ b/src/gst-plugin.cpp
>> @@ -0,0 +1,466 @@
>> +/* Plugin implementation for gstreamer encoder
>> + *
>> + * \copyright
>> + * Copyright 2018 Red Hat Inc. All rights reserved.
>> + */
>> +
>> +#include <config.h>
>> +#include <cstring>
>> +#include <exception>
>> +#include <stdexcept>
>> +#include <sstream>
>> +#include <memory>
>> +#include <syslog.h>
>> +#include <unistd.h>
>> +#include <gst/gst.h>
>> +#include <gst/app/gstappsink.h>
>> +
>> +#define XLIB_CAPTURE 1
>> +#if XLIB_CAPTURE
>> +#include <X11/Xlib.h>
>> +#include <gst/app/gstappsrc.h>
>> +#endif
>> +
>> +#include <spice-streaming-agent/plugin.hpp>
>> +#include <spice-streaming-agent/frame-capture.hpp>
>> +
>> +#define gst_syslog(priority, str, ...) syslog(priority, "Gstreamer plugin: " str, ## __VA_ARGS__);
>> +
>> +namespace spice {
>> +namespace streaming_agent {
>> +namespace gstreamer_plugin {
>> +
>> +struct GstreamerEncoderSettings
>> +{
>> + int fps = 25;
>> + SpiceVideoCodecType codec = SPICE_VIDEO_CODEC_TYPE_H264;
>> + std::string encoder;
>> +};
>> +
>> +template <typename T>
>> +struct GstObjectDeleter {
>> + void operator()(T* p)
>> + {
>> + gst_object_unref(p);
>> + }
>> +};
>> +
>> +template <typename T>
>> +using gst_object_ptr = std::unique_ptr<T, GstObjectDeleter<T> >;
> You don't need the spce inbetween "> >" in C++11 anymore, the parser
> has been updated.
>
> Also, using snake_case for type names is a std convention, we use
> CamelCase, how about GstObjectUPtr (added a "U" for "Unique" too here)
> and similarly for the other two?
>
>> +
>> +struct GstCapsDeleter {
>> + void operator()(GstCaps* p)
>> + {
>> + gst_caps_unref(p);
>> + }
>> +};
>> +
>> +using gst_caps_ptr = std::unique_ptr<GstCaps, GstCapsDeleter>;
>> +
>> +struct GstSampleDeleter {
>> + void operator()(GstSample* p)
>> + {
>> + gst_sample_unref(p);
>> + }
>> +};
>> +
>> +using gst_sample_ptr = std::unique_ptr<GstSample, GstSampleDeleter>;
>> +
>> +class GstreamerFrameCapture final: public FrameCapture
> Style: add a space before ":". Not mentioned in the guidelines, but the
> rest of the streaming agent code is that way, let's keep it consistent.
>
>> +{
>> +public:
>> + GstreamerFrameCapture(const GstreamerEncoderSettings &settings);
>> + ~GstreamerFrameCapture();
>> + FrameInfo CaptureFrame() override;
>> + void Reset() override;
>> + SpiceVideoCodecType VideoCodecType() const override {
>> + return settings.codec;
>> + }
>> +private:
>> + void free_sample();
>> + GstElement *get_encoder_plugin(const GstreamerEncoderSettings& settings, gst_caps_ptr &sink_caps);
> Inconsistent alignment of "&" on this single line itself, more
> throughout the file. I believe we align to the right here.
>
>> + GstElement *get_capture_plugin(const GstreamerEncoderSettings& settings);
>> + void pipeline_init(const GstreamerEncoderSettings& settings);
>> +#if XLIB_CAPTURE
>> + void xlib_capture();
>> + Display *dpy;
>> + XImage *image = nullptr;
>> +#endif
>> + gst_object_ptr<GstElement> pipeline, capture, sink;
>> + gst_sample_ptr sample;
>> + GstMapInfo map = {};
>> + uint32_t last_width = ~0u, last_height = ~0u;
>> + uint32_t cur_width = 0, cur_height = 0;
>> + bool is_first = true;
>> + GstreamerEncoderSettings settings; // will be set by plugin settings
>> +};
>> +
>> +class GstreamerPlugin final: public Plugin
>> +{
>> +public:
>> + FrameCapture *CreateCapture() override;
>> + unsigned Rank() override;
>> + void ParseOptions(const ConfigureOption *options);
>> + SpiceVideoCodecType VideoCodecType() const override {
>> + return settings.codec;
>> + }
>> +private:
>> + GstreamerEncoderSettings settings;
>> +};
>> +
>> +GstElement *GstreamerFrameCapture::get_capture_plugin(const GstreamerEncoderSettings& settings)
>> +{
>> + GstElement *capture = nullptr;
>> +
>> +#if XLIB_CAPTURE
>> + capture = gst_element_factory_make("appsrc", "capture");
>> +#else
>> + capture = gst_element_factory_make("ximagesrc", "capture");
>> + g_object_set(capture,
>> + "use-damage", 0,
>> + nullptr);
>> +
>> +#endif
> I'm still unhappy about these scattered #ifs throughout the code.
So after you remind me this again here I've tried to use capture with
template specialization as you mention before
but things were getting complicated mainly in regards of accessing the
GstreamerFrameCapture members, fixing
it seems to require more changes than i thought. For now I'd say it
could be left for a later patch.
Just a reminder - this xlib capture is here only since ximagesrc is not
yet support rt resolution changes, so hopefully
xlibcapure could be removed completely once this is solved (there's a bz
for it).
>
>> + return capture;
>> +}
>> +
>> +GstElement *GstreamerFrameCapture::get_encoder_plugin(const GstreamerEncoderSettings& settings,
>> + gst_caps_ptr &sink_caps)
>> +{
>> + GList *encoders;
>> + GList *filtered;
>> + GstElement *encoder;
>> + GstElementFactory *factory = nullptr;
>> + std::stringstream caps_ss;
>> +
>> + switch (settings.codec) {
>> + case SPICE_VIDEO_CODEC_TYPE_H264:
>> + caps_ss << "video/x-h264" << ",stream-format=(string)byte-stream";
>> + break;
>> + case SPICE_VIDEO_CODEC_TYPE_MJPEG:
>> + caps_ss << "image/jpeg";
>> + break;
>> + case SPICE_VIDEO_CODEC_TYPE_VP8:
>> + caps_ss << "video/x-vp8";
>> + break;
>> + case SPICE_VIDEO_CODEC_TYPE_VP9:
>> + caps_ss << "video/x-vp9";
>> + break;
>> + case SPICE_VIDEO_CODEC_TYPE_H265:
>> + caps_ss << "video/x-h265";
>> + break;
>> + default : /* Should not happen - just to avoid compiler's complaint */
>> + return nullptr;
> You can throw std::logic_error, i.e. an error in the program logic,
> here.
>
>> + }
>> + caps_ss << ",framerate=" << settings.fps << "/1";
>> +
>> + encoders = gst_element_factory_list_get_elements(GST_ELEMENT_FACTORY_TYPE_VIDEO_ENCODER, GST_RANK_NONE);
>> + sink_caps.reset(gst_caps_from_string(caps_ss.str().c_str()));
>> + filtered = gst_element_factory_list_filter(encoders, sink_caps.get(), GST_PAD_SRC, false);
>> + if (filtered) {
>> + gst_syslog(LOG_NOTICE, "Looking for plugins which can produce a '%s' stream", caps_ss.str().c_str());
>> + for (GList *l = filtered; l != nullptr; l = l->next) {
>> + if (!factory && !settings.encoder.compare(GST_ELEMENT_NAME(l->data))) {
>> + factory = (GstElementFactory*)l->data;
>> + }
>> + gst_syslog(LOG_NOTICE, "'%s' plugin is available", GST_ELEMENT_NAME(l->data));
>> + }
>> + if (!factory && !settings.encoder.empty()) {
>> + gst_syslog(LOG_WARNING, "Specified encoder '%s' cannot produce '%s' stream, make sure matching gst.codec is specified", settings.encoder.c_str(), caps_ss.str().c_str());
>> + }
>> + factory = factory ? factory : (GstElementFactory*)filtered->data;
>> + gst_syslog(LOG_NOTICE, "'%s' encoder plugin is used", GST_ELEMENT_NAME(factory));
>> +
>> + } else {
>> + gst_syslog(LOG_ERR, "No suitable encoder was found for '%s'", caps_ss.str().c_str());
>> + }
>> +
>> + encoder = factory ? gst_element_factory_create(factory, "encoder") : nullptr;
>> + if (encoder) { // Invalid properties will be ignored silently
>> + /* x264enc properties */
>> + gst_util_set_object_arg(G_OBJECT(encoder), "tune", "zerolatency");// stillimage, fastdecode, zerolatency
>> + gst_util_set_object_arg(G_OBJECT(encoder), "bframes", "0");
>> + gst_util_set_object_arg(G_OBJECT(encoder), "speed-preset", "1");// 1-ultrafast, 6-med, 9-veryslow
>> + }
>> + gst_plugin_feature_list_free(filtered);
>> + gst_plugin_feature_list_free(encoders);
> It would be nice to use a std::unique_ptr with a deleter for this too.
> Then you could throw exceptions from this function in appropriate
> places instead of returning null and checking the return value later.
>
>> + return encoder;
>> +}
>> +
>> +// Utility to add an element to a GstBin
>> +// This to check return value and update reference correctly
> "This is to check the return value and update the reference correctly"?
>
>> +void gst_bin_add(GstBin *bin, const gst_object_ptr<GstElement> &elem)
>> +{
>> + if (::gst_bin_add(bin, elem.get())) {
>> + // ::gst_bin_add take ownership using floating references but
>> + // we still hold a reference in elem so update reference
>> + // according
> "... so update the reference accordingly"?
>
>> + g_object_ref(elem.get());
>> + } else {
>> + throw std::runtime_error("Gstreamer's element cannot be added");
> Message: "Gstreamer's element cannot be added to the bin"? A simple
> "... cannot be added" confuses me, it can mean a lot of things. (even
> though in practice my update to the message may not be very helpful
> anyway ;) - feel free to improve further)
>
>> + }
>> +}
>> +
>> +void GstreamerFrameCapture::pipeline_init(const GstreamerEncoderSettings& settings)
>> +{
>> + gboolean link;
>> +
>> + gst_object_ptr<GstElement> pipeline(gst_pipeline_new("pipeline"));
>> + if (!pipeline) {
>> + throw std::runtime_error("Gstreamer's pipeline element cannot be created");
>> + }
>> + gst_object_ptr<GstElement> capture(get_capture_plugin(settings));
>> + if (!capture) {
>> + throw std::runtime_error("Gstreamer's capture element cannot be created");
>> + }
>> + gst_object_ptr<GstElement> convert(gst_element_factory_make("videoconvert", "convert"));
>> + if (!convert) {
>> + throw std::runtime_error("Gstreamer's 'videoconvert' element cannot be created");
>> + }
>> + gst_caps_ptr sink_caps;
>> + gst_object_ptr<GstElement> encoder(get_encoder_plugin(settings, sink_caps));
>> + if (!encoder) {
>> + throw std::runtime_error("Gstreamer's encoder element cannot be created");
>> + }
>> + gst_object_ptr<GstElement> sink(gst_element_factory_make("appsink", "sink"));
>> + if (!sink) {
>> + throw std::runtime_error("Gstreamer's appsink element cannot be created");
>> + }
>> +
>> + g_object_set(sink.get(),
>> + "sync", FALSE,
>> + "drop", TRUE,
>> + "max-buffers", 1,
>> + nullptr);
>> +
>> + GstBin *bin = GST_BIN(pipeline.get());
>> + gst_bin_add(bin, capture);
>> + gst_bin_add(bin, convert);
>> + gst_bin_add(bin, encoder);
>> + gst_bin_add(bin, sink);
>> +
>> + //gst_caps_ptr caps(gst_caps_from_string("video/x-raw,format=(string)I420"));
> Might wanna remove this for the final version...
>
>> + gst_caps_ptr caps(gst_caps_from_string("video/x-raw"));
>> + link = gst_element_link(capture.get(), convert.get()) &&
>> + gst_element_link_filtered(convert.get(), encoder.get(), caps.get()) &&
>> + gst_element_link_filtered(encoder.get(), sink.get(), sink_caps.get());
>> + if (!link) {
>> + throw std::runtime_error("Linking gstreamer's elements failed");
>> + }
>> +
>> +#if XLIB_CAPTURE
>> + dpy = XOpenDisplay(nullptr);
>> + if (!dpy) {
>> + throw std::runtime_error("Unable to initialize X11");
>> + }
>> +#endif
>> +
>> + gst_element_set_state(pipeline.get(), GST_STATE_PLAYING);
>> +
>> +#if !XLIB_CAPTURE
>> + int sx, sy, ex, ey;
>> + g_object_get(capture.get(),
>> + "endx", &ex,
>> + "endy", &ey,
>> + "startx", &sx,
>> + "starty", &sy,
>> + nullptr);
>> + cur_width = ex - sx;
>> + cur_height = ey - sy;
>> + if (cur_width < 16 || cur_height < 16) {
>> + throw std::runtime_error("Invalid screen size");
>> + }
>> + g_object_set(capture.get(),
>> + /* Some encoders cannot handle odd resolution make sure it's even number of pixels
>> + * pixel counting starts from zero here!
>> + */
>> + "endx", cur_width - !(cur_width%2),
>> + "endy", cur_height - !(cur_height%2),
> Style: spaces around "%".
>
>> + "startx", 0,
>> + "starty", 0,
>> + nullptr);
>> +#endif
>> +
>> + this->sink.swap(sink);
>> + this->capture.swap(capture);
>> + this->pipeline.swap(pipeline);
>> +}
>> +
>> +GstreamerFrameCapture::GstreamerFrameCapture(const GstreamerEncoderSettings& settings):
>> + settings(settings)
>> +{
>> + pipeline_init(settings);
>> +}
>> +
>> +void GstreamerFrameCapture::free_sample()
>> +{
>> + if (sample) {
>> + gst_buffer_unmap(gst_sample_get_buffer(sample.get()), &map);
>> + sample.reset();
>> + }
>> +#if XLIB_CAPTURE
>> + if(image) {
>> + image->f.destroy_image(image);
>> + image = nullptr;
>> + }
>> +#endif
>> +}
>> +
>> +GstreamerFrameCapture::~GstreamerFrameCapture()
>> +{
>> + free_sample();
>> + gst_element_set_state(pipeline.get(), GST_STATE_NULL);
>> +#if XLIB_CAPTURE
>> + XCloseDisplay(dpy);
>> +#endif
>> +}
>> +
>> +void GstreamerFrameCapture::Reset()
>> +{
>> + //TODO
>> +}
>> +
>> +#if XLIB_CAPTURE
>> +void GstreamerFrameCapture::xlib_capture()
>> +{
>> + int screen = XDefaultScreen(dpy);
>> +
>> + Window win = RootWindow(dpy, screen);
>> + XWindowAttributes win_info;
>> + XGetWindowAttributes(dpy, win, &win_info);
>> +
>> + /* Some encoders cannot handle odd resolution make sure it's even number of pixels */
>> + cur_width = win_info.width - win_info.width%2;
>> + cur_height = win_info.height - win_info.height%2;
> Style: spaces around "%".
>
>> +
>> + if (cur_width != last_width || cur_height != last_height) {
>> + last_width = cur_width;
>> + last_height = cur_height;
>> + is_first = true;
>> +
>> + gst_app_src_end_of_stream(GST_APP_SRC(capture.get()));
>> + gst_element_set_state(pipeline.get(), GST_STATE_NULL);//maybe ximagesrc needs eos as well
>> + gst_element_set_state(pipeline.get(), GST_STATE_PLAYING);
>> + }
>> +
>> + image = XGetImage(dpy, win, 0, 0,
>> + cur_width, cur_height, AllPlanes, ZPixmap);
>> + if (!image) {
>> + throw std::runtime_error("Cannot capture from X");
>> + }
>> +
>> + GstBuffer *buf;
>> + buf = gst_buffer_new_wrapped(image->data, image->height * image->bytes_per_line);
>> + if (!buf) {
>> + throw std::runtime_error("Failed to wrap image in gstreamer buffer");
>> + }
>> +
>> + std::stringstream ss;
>> +
>> + ss << "video/x-raw,format=BGRx,width=" << image->width << ",height=" << image->height << ",framerate=" << settings.fps << "/1";
>> + gst_caps_ptr caps(gst_caps_from_string(ss.str().c_str()));
>> +
>> + // Push sample
>> + gst_sample_ptr appsrc_sample(gst_sample_new(buf, caps.get(), nullptr, nullptr));
>> + if (gst_app_src_push_sample(GST_APP_SRC(capture.get()), appsrc_sample.get()) != GST_FLOW_OK) {
>> + throw std::runtime_error("gstramer appsrc element cannot push sample");
>> + }
>> +}
>> +#endif
>> +
>> +FrameInfo GstreamerFrameCapture::CaptureFrame()
>> +{
>> + FrameInfo info;
>> +
>> + free_sample(); // free prev if exist
>> +
>> +#if XLIB_CAPTURE
>> + xlib_capture();
>> +#endif
>> + info.size.width = cur_width;
>> + info.size.height = cur_height;
>> + info.stream_start = is_first;
>> + if (is_first) {
>> + is_first = false;
>> + }
>> +
>> + // Pull sample
>> + sample.reset(gst_app_sink_pull_sample(GST_APP_SINK(sink.get()))); // blocking
>> +
>> + if (sample) { // map after pipeline
>> + if (!gst_buffer_map(gst_sample_get_buffer(sample.get()), &map, GST_MAP_READ)) {
>> + free_sample();
>> + throw std::runtime_error("Buffer mapping failed");
>> + }
>> +
>> + info.buffer = map.data;
>> + info.buffer_size = map.size;
>> + } else {
>> + throw std::runtime_error("No sample- EOS or state change");
>> + }
>> +
>> + return info;
>> +}
>> +
>> +FrameCapture *GstreamerPlugin::CreateCapture()
>> +{
>> + return new GstreamerFrameCapture(settings);
>> +}
>> +
>> +unsigned GstreamerPlugin::Rank()
>> +{
>> + return SoftwareMin;
>> +}
>> +
>> +void GstreamerPlugin::ParseOptions(const ConfigureOption *options)
>> +{
>> + for (; options->name; ++options) {
>> + const std::string name = options->name;
>> + const std::string value = options->value;
>> +
>> + if (name == "framerate") {
>> + try {
>> + settings.fps = std::stoi(value);
>> + } catch (const std::exception &e) {
>> + throw std::runtime_error("Invalid value '" + value + "' for option 'framerate'.");
>> + }
>> + } else if (name == "gst.codec") {
>> + if (value == "h264") {
>> + settings.codec = SPICE_VIDEO_CODEC_TYPE_H264;
>> + } else if (value == "vp9") {
>> + settings.codec = SPICE_VIDEO_CODEC_TYPE_VP9;
>> + } else if (value == "vp8") {
>> + settings.codec = SPICE_VIDEO_CODEC_TYPE_VP8;
>> + } else if (value == "mjpeg") {
>> + settings.codec = SPICE_VIDEO_CODEC_TYPE_MJPEG;
>> + } else if (value == "h265") {
>> + settings.codec = SPICE_VIDEO_CODEC_TYPE_H265;
>> + } else {
>> + throw std::runtime_error("Invalid value '" + value + "' for option 'gst.codec'.");
>> + }
>> + } else if (name == "gst.encoder") {
>> + if (value.length() < 3) {
>> + gst_syslog(LOG_WARNING, "Encoder name length is invalid, will be ignored");
> Is there a difference with this check that is does only a warning
> instead of throwing an exception?
>
> Also, is the check really useful for anything or would it be the same
> if the code simply failed to find an encoder with the invalid name
> later?
It's indeed not very useful.
>
> Cheers,
> Lukas
>
>> + } else {
>> + settings.encoder = value;
>> + }
>> + }
>> + }
>> +}
>> +
>> +}}} //namespace spice::streaming_agent::gstreamer_plugin
>> +
>> +using namespace spice::streaming_agent::gstreamer_plugin;
>> +
>> +SPICE_STREAMING_AGENT_PLUGIN(agent)
>> +{
>> + gst_init(nullptr, nullptr);
>> +
>> + std::unique_ptr<GstreamerPlugin> plugin(new GstreamerPlugin());
>> +
>> + plugin->ParseOptions(agent->Options());
>> +
>> + agent->Register(*plugin.release());
>> +
>> + return true;
>> +}
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