gstreamer/ext/wpe/gstwpesrcbin.cpp

531 lines
16 KiB
C++

/* Copyright (C) <2018, 2019> Philippe Normand <philn@igalia.com>
* Copyright (C) <2018, 2019> Žan Doberšek <zdobersek@igalia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-wpesrc
* @title: wpesrc
*
* The wpesrc element is used to produce a video texture representing a web page
* rendered off-screen by WPE.
*
* Starting from WPEBackend-FDO 1.6.x, software rendering support is available.
* This features allows wpesrc to be used on machines without GPU, and/or for
* testing purpose. To enable it, set the `LIBGL_ALWAYS_SOFTWARE=true`
* environment variable and make sure `video/x-raw, format=BGRA` caps are
* negotiated by the wpesrc element.
*
* ## Example launch lines
*
* ### Show the GStreamer website homepage
*
* ```
* gst-launch-1.0 -v wpesrc location="https://gstreamer.freedesktop.org" ! queue ! glimagesink
* ```
*
* ### Save the first 50 video frames generated for the GStreamer website as PNG files in /tmp
*
* ```
* LIBGL_ALWAYS_SOFTWARE=true gst-launch-1.0 -v wpesrc num-buffers=50 location="https://gstreamer.freedesktop.org" ! videoconvert ! pngenc ! multifilesink location=/tmp/snapshot-%05d.png
* ```
*
*
* ### Show the GStreamer website homepage as played with GstPlayer in a GTK+ window
*
* ```
* gst-play-1.0 --videosink gtkglsink wpe://https://gstreamer.freedesktop.org
* ```
*
* ### Composite WPE with a video stream in a single OpenGL scene
*
* ```
* gst-launch-1.0 glvideomixer name=m sink_1::zorder=0 ! glimagesink wpesrc location="file:///home/phil/Downloads/plunk/index.html" draw-background=0 ! m. videotestsrc ! queue ! glupload ! glcolorconvert ! m.
* ```
*
*
* ### Composite WPE with a video stream, sink_0 pad properties have to match the video dimensions
*
* ```
* gst-launch-1.0 glvideomixer name=m sink_1::zorder=0 sink_0::height=818 sink_0::width=1920 ! gtkglsink wpesrc location="file:///home/phil/Downloads/plunk/index.html" draw-background=0 ! m. uridecodebin uri="http://192.168.1.44/Sintel.2010.1080p.mkv" name=d d. ! queue ! glupload ! glcolorconvert ! m.
* ```
*
* Additionally, any audio stream created by WPE is exposed as "sometimes" audio
* source pads.
*
* This source also relays GStreamer bus messages from the GStreamer pipelines
* running inside the web pages as [element custom](gst_message_new_custom)
* messages which structure is called `WpeForwarded` and has the following
* fields:
*
* * `message`: The original #GstMessage
* * `wpesrc-original-src-name`: Name of the original element posting the
* message
* * `wpesrc-original-src-type`: Name of the GType of the original element
* posting the message
* * `wpesrc-original-src-path`: [Path](gst_object_get_path_string) of the
* original element positing the message
*
* Note: This feature will be disabled if you disable the tracer subsystem.
*/
#include "gstwpesrcbin.h"
#include "gstwpevideosrc.h"
#include "gstwpe.h"
#include "WPEThreadedView.h"
#include <gst/allocators/allocators.h>
#include <gst/base/gstflowcombiner.h>
#include <wpe/extensions/audio.h>
#include <sys/mman.h>
#include <unistd.h>
G_DEFINE_TYPE (GstWpeAudioPad, gst_wpe_audio_pad, GST_TYPE_GHOST_PAD);
static void
gst_wpe_audio_pad_class_init (GstWpeAudioPadClass * klass)
{
}
static void
gst_wpe_audio_pad_init (GstWpeAudioPad * pad)
{
gst_audio_info_init (&pad->info);
pad->discont_pending = FALSE;
pad->buffer_time = 0;
}
static GstWpeAudioPad *
gst_wpe_audio_pad_new (const gchar * name)
{
GstWpeAudioPad *pad = GST_WPE_AUDIO_PAD (g_object_new (gst_wpe_audio_pad_get_type (),
"name", name, "direction", GST_PAD_SRC, NULL));
if (!gst_ghost_pad_construct (GST_GHOST_PAD (pad))) {
gst_object_unref (pad);
return NULL;
}
return pad;
}
struct _GstWpeSrc
{
GstBin parent;
GstAllocator *fd_allocator;
GstElement *video_src;
GHashTable *audio_src_pads;
GstFlowCombiner *flow_combiner;
};
enum
{
PROP_0,
PROP_LOCATION,
PROP_DRAW_BACKGROUND
};
enum
{
SIGNAL_LOAD_BYTES,
LAST_SIGNAL
};
static guint gst_wpe_video_src_signals[LAST_SIGNAL] = { 0 };
static void gst_wpe_src_uri_handler_init (gpointer iface, gpointer data);
GST_DEBUG_CATEGORY_EXTERN (wpe_src_debug);
#define GST_CAT_DEFAULT wpe_src_debug
#define gst_wpe_src_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstWpeSrc, gst_wpe_src, GST_TYPE_BIN,
G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER, gst_wpe_src_uri_handler_init));
/**
* GstWpeSrc!video
*
* Since: 1.20
*/
static GstStaticPadTemplate video_src_factory =
GST_STATIC_PAD_TEMPLATE ("video", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw(memory:GLMemory), "
"format = (string) RGBA, "
"width = " GST_VIDEO_SIZE_RANGE ", "
"height = " GST_VIDEO_SIZE_RANGE ", "
"framerate = " GST_VIDEO_FPS_RANGE ", "
"pixel-aspect-ratio = (fraction)1/1,"
"texture-target = (string)2D"
"; video/x-raw, "
"format = (string) BGRA, "
"width = " GST_VIDEO_SIZE_RANGE ", "
"height = " GST_VIDEO_SIZE_RANGE ", "
"framerate = " GST_VIDEO_FPS_RANGE ", "
"pixel-aspect-ratio = (fraction)1/1"
));
/**
* GstWpeSrc!audio_%u
*
* Each audio stream in the renderer web page will expose the and `audio_%u`
* #GstPad.
*
* Since: 1.20
*/
static GstStaticPadTemplate audio_src_factory =
GST_STATIC_PAD_TEMPLATE ("audio_%u", GST_PAD_SRC, GST_PAD_SOMETIMES,
GST_STATIC_CAPS ( \
GST_AUDIO_CAPS_MAKE (GST_AUDIO_NE (F32)) ", layout=(string)interleaved; " \
GST_AUDIO_CAPS_MAKE (GST_AUDIO_NE (F64)) ", layout=(string)interleaved; " \
GST_AUDIO_CAPS_MAKE (GST_AUDIO_NE (S16)) ", layout=(string)interleaved" \
));
static GstFlowReturn
gst_wpe_src_chain_buffer (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstWpeSrc *src = GST_WPE_SRC (gst_object_get_parent (parent));
GstFlowReturn result, chain_result;
chain_result = gst_proxy_pad_chain_default (pad, GST_OBJECT_CAST (src), buffer);
result = gst_flow_combiner_update_pad_flow (src->flow_combiner, pad, chain_result);
gst_object_unref (src);
if (result == GST_FLOW_FLUSHING)
return chain_result;
return result;
}
void
gst_wpe_src_new_audio_stream (GstWpeSrc *src, guint32 id, GstCaps *caps, const gchar *stream_id)
{
GstWpeAudioPad *audio_pad;
GstPad *pad;
gchar *name;
GstEvent *stream_start;
GstSegment segment;
name = g_strdup_printf ("audio_%u", id);
audio_pad = gst_wpe_audio_pad_new (name);
pad = GST_PAD_CAST (audio_pad);
g_free (name);
gst_pad_set_active (pad, TRUE);
gst_element_add_pad (GST_ELEMENT_CAST (src), pad);
gst_flow_combiner_add_pad (src->flow_combiner, pad);
GST_DEBUG_OBJECT (src, "Adding pad: %" GST_PTR_FORMAT, pad);
stream_start = gst_event_new_stream_start (stream_id);
gst_pad_push_event (pad, stream_start);
gst_audio_info_from_caps (&audio_pad->info, caps);
gst_pad_push_event (pad, gst_event_new_caps (caps));
gst_segment_init (&segment, GST_FORMAT_TIME);
gst_pad_push_event (pad, gst_event_new_segment (&segment));
g_hash_table_insert (src->audio_src_pads, GUINT_TO_POINTER (id), audio_pad);
}
void
gst_wpe_src_set_audio_shm (GstWpeSrc* src, GUnixFDList *fds, guint32 id)
{
gint fd;
GstWpeAudioPad *audio_pad = GST_WPE_AUDIO_PAD (g_hash_table_lookup (src->audio_src_pads, GUINT_TO_POINTER (id)));
g_return_if_fail (GST_IS_WPE_SRC (src));
g_return_if_fail (fds);
g_return_if_fail (g_unix_fd_list_get_length (fds) == 1);
g_return_if_fail (audio_pad->fd <= 0);
fd = g_unix_fd_list_get (fds, 0, NULL);
g_return_if_fail (fd >= 0);
if (audio_pad->fd > 0)
close(audio_pad->fd);
audio_pad->fd = dup(fd);
}
void
gst_wpe_src_push_audio_buffer (GstWpeSrc* src, guint32 id, guint64 size)
{
GstWpeAudioPad *audio_pad = GST_WPE_AUDIO_PAD (g_hash_table_lookup (src->audio_src_pads, GUINT_TO_POINTER (id)));
GstBuffer *buffer;
g_return_if_fail (audio_pad->fd > 0);
GST_TRACE_OBJECT (audio_pad, "Handling incoming audio packet");
gpointer data = mmap (0, size, PROT_READ, MAP_PRIVATE, audio_pad->fd, 0);
buffer = gst_buffer_new_memdup (data, size);
munmap (data, size);
gst_buffer_add_audio_meta (buffer, &audio_pad->info, size, NULL);
audio_pad->buffer_time = gst_element_get_current_running_time (GST_ELEMENT (src));
GST_BUFFER_DTS (buffer) = audio_pad->buffer_time;
GST_BUFFER_PTS (buffer) = audio_pad->buffer_time;
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DISCONT);
if (audio_pad->discont_pending) {
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
audio_pad->discont_pending = FALSE;
}
gst_flow_combiner_update_pad_flow (src->flow_combiner, GST_PAD (audio_pad),
gst_pad_push (GST_PAD_CAST (audio_pad), buffer));
}
static void
gst_wpe_src_remove_audio_pad (GstWpeSrc *src, GstPad *pad)
{
GST_DEBUG_OBJECT (src, "Removing pad: %" GST_PTR_FORMAT, pad);
gst_element_remove_pad (GST_ELEMENT_CAST (src), pad);
gst_flow_combiner_remove_pad (src->flow_combiner, pad);
}
void
gst_wpe_src_stop_audio_stream(GstWpeSrc* src, guint32 id)
{
GstPad *pad = GST_PAD (g_hash_table_lookup (src->audio_src_pads, GUINT_TO_POINTER (id)));
g_return_if_fail (GST_IS_PAD (pad));
GST_INFO_OBJECT(pad, "Stopping");
gst_pad_push_event (pad, gst_event_new_eos ());
gst_wpe_src_remove_audio_pad (src, pad);
g_hash_table_remove (src->audio_src_pads, GUINT_TO_POINTER (id));
}
void
gst_wpe_src_pause_audio_stream(GstWpeSrc* src, guint32 id)
{
GstWpeAudioPad *audio_pad = GST_WPE_AUDIO_PAD (g_hash_table_lookup (src->audio_src_pads, GUINT_TO_POINTER (id)));
GstPad *pad = GST_PAD_CAST (audio_pad);
g_return_if_fail (GST_IS_PAD (pad));
GST_INFO_OBJECT(pad, "Pausing");
gst_pad_push_event (pad, gst_event_new_gap (audio_pad->buffer_time, GST_CLOCK_TIME_NONE));
audio_pad->discont_pending = TRUE;
}
static void
gst_wpe_src_load_bytes (GstWpeVideoSrc * src, GBytes * bytes)
{
GstWpeSrc *self = GST_WPE_SRC (src);
if (self->video_src)
g_signal_emit_by_name (self->video_src, "load-bytes", bytes, NULL);
}
static void
gst_wpe_src_set_location (GstWpeSrc * src, const gchar * location)
{
g_object_set (src->video_src, "location", location, NULL);
}
static void
gst_wpe_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstWpeSrc *self = GST_WPE_SRC (object);
if (self->video_src)
g_object_get_property (G_OBJECT (self->video_src), pspec->name, value);
}
static void
gst_wpe_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstWpeSrc *self = GST_WPE_SRC (object);
if (self->video_src) {
if (prop_id == PROP_LOCATION)
gst_wpe_src_set_location (self, g_value_get_string (value));
else
g_object_set_property (G_OBJECT (self->video_src), pspec->name, value);
}
}
static GstURIType
gst_wpe_src_uri_get_type (GType)
{
return GST_URI_SRC;
}
static const gchar *const *
gst_wpe_src_get_protocols (GType)
{
static const char *protocols[] = { "wpe", NULL };
return protocols;
}
static gchar *
gst_wpe_src_get_uri (GstURIHandler * handler)
{
GstWpeSrc *src = GST_WPE_SRC (handler);
gchar *location;
gchar *res;
g_object_get (src->video_src, "location", &location, NULL);
res = g_strdup_printf ("wpe://%s", location);
g_free (location);
return res;
}
static gboolean
gst_wpe_src_set_uri (GstURIHandler * handler, const gchar * uri,
GError ** error)
{
GstWpeSrc *src = GST_WPE_SRC (handler);
gst_wpe_src_set_location(src, uri + 6);
return TRUE;
}
static void
gst_wpe_src_uri_handler_init (gpointer iface_ptr, gpointer data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) iface_ptr;
iface->get_type = gst_wpe_src_uri_get_type;
iface->get_protocols = gst_wpe_src_get_protocols;
iface->get_uri = gst_wpe_src_get_uri;
iface->set_uri = gst_wpe_src_set_uri;
}
static void
gst_wpe_src_init (GstWpeSrc * src)
{
GstPad *pad;
GstPad *ghost_pad;
GstProxyPad *proxy_pad;
gst_bin_set_suppressed_flags (GST_BIN_CAST (src),
static_cast<GstElementFlags>(GST_ELEMENT_FLAG_SOURCE | GST_ELEMENT_FLAG_SINK));
GST_OBJECT_FLAG_SET (src, GST_ELEMENT_FLAG_SOURCE);
src->fd_allocator = gst_fd_allocator_new ();
src->audio_src_pads = g_hash_table_new (g_direct_hash, g_direct_equal);
src->flow_combiner = gst_flow_combiner_new ();
src->video_src = gst_element_factory_make ("wpevideosrc", NULL);
gst_bin_add (GST_BIN_CAST (src), src->video_src);
pad = gst_element_get_static_pad (GST_ELEMENT_CAST (src->video_src), "src");
ghost_pad = gst_ghost_pad_new_from_template ("video", pad,
gst_static_pad_template_get (&video_src_factory));
proxy_pad = gst_proxy_pad_get_internal (GST_PROXY_PAD (ghost_pad));
gst_pad_set_active (GST_PAD_CAST (proxy_pad), TRUE);
gst_element_add_pad (GST_ELEMENT_CAST (src), GST_PAD_CAST (ghost_pad));
gst_flow_combiner_add_pad (src->flow_combiner, GST_PAD_CAST (ghost_pad));
gst_pad_set_chain_function (GST_PAD_CAST (proxy_pad), gst_wpe_src_chain_buffer);
gst_object_unref (proxy_pad);
gst_object_unref (pad);
}
static gboolean
gst_wpe_audio_remove_audio_pad (gint32 *id, GstPad *pad, GstWpeSrc *self)
{
gst_wpe_src_remove_audio_pad (self, pad);
return TRUE;
}
static GstStateChangeReturn
gst_wpe_src_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn result;
GstWpeSrc *src = GST_WPE_SRC (element);
GST_DEBUG_OBJECT (src, "%s", gst_state_change_get_name (transition));
result = GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS , change_state, (element, transition), GST_STATE_CHANGE_FAILURE);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:{
g_hash_table_foreach_remove (src->audio_src_pads, (GHRFunc) gst_wpe_audio_remove_audio_pad, src);
gst_flow_combiner_reset (src->flow_combiner);
break;
}
default:
break;
}
return result;
}
static void
gst_wpe_src_dispose (GObject *object)
{
GstWpeSrc *src = GST_WPE_SRC (object);
g_hash_table_unref (src->audio_src_pads);
gst_flow_combiner_free (src->flow_combiner);
gst_object_unref (src->fd_allocator);
GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
}
static void
gst_wpe_src_class_init (GstWpeSrcClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gst_wpe_src_set_property;
gobject_class->get_property = gst_wpe_src_get_property;
gobject_class->dispose = gst_wpe_src_dispose;
g_object_class_install_property (gobject_class, PROP_LOCATION,
g_param_spec_string ("location", "location", "The URL to display", "",
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_DRAW_BACKGROUND,
g_param_spec_boolean ("draw-background", "Draws the background",
"Whether to draw the WebView background", TRUE,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
gst_element_class_set_static_metadata (element_class, "WPE source",
"Source/Video/Audio", "Creates Audio/Video streams from a web"
" page using WPE web engine",
"Philippe Normand <philn@igalia.com>, Žan Doberšek "
"<zdobersek@igalia.com>");
/**
* GstWpeSrc::load-bytes:
* @src: the object which received the signal
* @bytes: the GBytes data to load
*
* Load the specified bytes into the internal webView.
*/
gst_wpe_video_src_signals[SIGNAL_LOAD_BYTES] =
g_signal_new_class_handler ("load-bytes", G_TYPE_FROM_CLASS (klass),
static_cast < GSignalFlags > (G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION),
G_CALLBACK (gst_wpe_src_load_bytes), NULL, NULL, NULL, G_TYPE_NONE, 1,
G_TYPE_BYTES);
element_class->change_state = GST_DEBUG_FUNCPTR (gst_wpe_src_change_state);
gst_element_class_add_static_pad_template (element_class, &video_src_factory);
gst_element_class_add_static_pad_template (element_class, &audio_src_factory);
}