/* Generic video mixer plugin * Copyright (C) 2004 Wim Taymans * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:element-videomixer * * Videomixer can accept AYUV and BGRA video streams. For each of the requested * sink pads it will compare the incoming geometry and framerate to define the * output parameters. Indeed output video frames will have the geometry of the * biggest incoming video stream and the framerate of the fastest incoming one. * * All sink pads must be either AYUV or BGRA, but a mixture of them is not * supported. The src pad will have the same colorspace as the sinks. * No colorspace conversion is done. * * * Individual parameters for each input stream can be configured on the * #GstVideoMixerPad. * * * Sample pipelines * |[ * gst-launch videotestsrc pattern=1 ! video/x-raw-yuv, framerate=\(fraction\)10/1, width=100, height=100 ! videobox border-alpha=0 alpha=0.5 top=-70 bottom=-70 right=-220 ! videomixer name=mix ! ffmpegcolorspace ! xvimagesink videotestsrc ! video/x-raw-yuv, framerate=\(fraction\)5/1, width=320, height=240 ! alpha alpha=0.7 ! mix. * ]| A pipeline to demonstrate videomixer used together with videobox. * This should show a 320x240 pixels video test source with some transparency * showing the background checker pattern. Another video test source with just * the snow pattern of 100x100 pixels is overlayed on top of the first one on * the left vertically centered with a small transparency showing the first * video test source behind and the checker pattern under it. Note that the * framerate of the output video is 10 frames per second. * |[ * gst-launch videotestsrc pattern=1 ! video/x-raw-rgb, framerate=\(fraction\)10/1, width=100, height=100 ! videomixer name=mix ! ffmpegcolorspace ! ximagesink videotestsrc ! video/x-raw-rgb, framerate=\(fraction\)5/1, width=320, height=240 ! mix. * ]| A pipeline to demostrate bgra mixing. (This does not demonstrate alpha blending). * |[ * gst-launch videotestsrc pattern=1 ! video/x-raw-yuv,format =\(fourcc\)I420, framerate=\(fraction\)10/1, width=100, height=100 ! videomixer name=mix ! ffmpegcolorspace ! ximagesink videotestsrc ! video/x-raw-yuv,format=\(fourcc\)I420, framerate=\(fraction\)5/1, width=320, height=240 ! mix. * ]| A pipeline to test I420 * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #ifdef HAVE_STDLIB_H #include #endif #ifdef HAVE_STRING_H #include #endif #include "videomixer.h" GST_DEBUG_CATEGORY_STATIC (gst_videomixer_debug); #define GST_CAT_DEFAULT gst_videomixer_debug #define GST_VIDEO_MIXER_GET_STATE_LOCK(mix) \ (GST_VIDEO_MIXER(mix)->state_lock) #define GST_VIDEO_MIXER_STATE_LOCK(mix) \ (g_mutex_lock(GST_VIDEO_MIXER_GET_STATE_LOCK (mix))) #define GST_VIDEO_MIXER_STATE_UNLOCK(mix) \ (g_mutex_unlock(GST_VIDEO_MIXER_GET_STATE_LOCK (mix))) static GType gst_videomixer_get_type (void); static void gst_videomixer_pad_class_init (GstVideoMixerPadClass * klass); static void gst_videomixer_pad_init (GstVideoMixerPad * mixerpad); static void gst_videomixer_pad_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_videomixer_pad_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static gboolean gst_videomixer_src_event (GstPad * pad, GstEvent * event); static gboolean gst_videomixer_sink_event (GstPad * pad, GstEvent * event); static void gst_videomixer_sort_pads (GstVideoMixer * mix); /*AYUV function definitions see file: blend_ayuv*/ void gst_videomixer_blend_ayuv_ayuv (guint8 * src, gint xpos, gint ypos, gint src_width, gint src_height, gdouble src_alpha, guint8 * dest, gint dest_width, gint dest_height); void gst_videomixer_fill_ayuv_checker (guint8 * dest, gint width, gint height); void gst_videomixer_fill_ayuv_color (guint8 * dest, gint width, gint height, gint colY, gint colU, gint colV); size_t gst_videomixer_calculate_frame_size_ayuv (gint width, gint height); /*BGRA function definitions see file: blend_ayuv*/ void gst_videomixer_blend_bgra_bgra (guint8 * src, gint xpos, gint ypos, gint src_width, gint src_height, gdouble src_alpha, guint8 * dest, gint dest_width, gint dest_height); void gst_videomixer_fill_bgra_checker (guint8 * dest, gint width, gint height); void gst_videomixer_fill_bgra_color (guint8 * dest, gint width, gint height, gint colY, gint colU, gint colV); size_t gst_videomixer_calculate_frame_size_bgra (gint width, gint height); /*I420 function definitions see file: blend_i420.c*/ void gst_videomixer_blend_i420_i420 (guint8 * src, gint xpos, gint ypos, gint src_width, gint src_height, gdouble src_alpha, guint8 * dest, gint dest_width, gint dest_heighty); void gst_videomixer_fill_i420_checker (guint8 * dest, gint width, gint height); void gst_videomixer_fill_i420_color (guint8 * dest, gint width, gint height, gint colY, gint colU, gint colV); size_t gst_videomixer_calculate_frame_size_i420 (gint width, gint height); #define DEFAULT_PAD_ZORDER 0 #define DEFAULT_PAD_XPOS 0 #define DEFAULT_PAD_YPOS 0 #define DEFAULT_PAD_ALPHA 1.0 enum { ARG_PAD_0, ARG_PAD_ZORDER, ARG_PAD_XPOS, ARG_PAD_YPOS, ARG_PAD_ALPHA }; static GType gst_videomixer_pad_get_type (void) { static GType videomixer_pad_type = 0; if (!videomixer_pad_type) { static const GTypeInfo videomixer_pad_info = { sizeof (GstVideoMixerPadClass), NULL, NULL, (GClassInitFunc) gst_videomixer_pad_class_init, NULL, NULL, sizeof (GstVideoMixerPad), 0, (GInstanceInitFunc) gst_videomixer_pad_init, }; videomixer_pad_type = g_type_register_static (GST_TYPE_PAD, "GstVideoMixerPad", &videomixer_pad_info, 0); } return videomixer_pad_type; } static void gst_videomixer_pad_class_init (GstVideoMixerPadClass * klass) { GObjectClass *gobject_class; gobject_class = (GObjectClass *) klass; gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_videomixer_pad_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_videomixer_pad_get_property); g_object_class_install_property (gobject_class, ARG_PAD_ZORDER, g_param_spec_uint ("zorder", "Z-Order", "Z Order of the picture", 0, 10000, DEFAULT_PAD_ZORDER, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE)); g_object_class_install_property (gobject_class, ARG_PAD_XPOS, g_param_spec_int ("xpos", "X Position", "X Position of the picture", G_MININT, G_MAXINT, DEFAULT_PAD_XPOS, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE)); g_object_class_install_property (gobject_class, ARG_PAD_YPOS, g_param_spec_int ("ypos", "Y Position", "Y Position of the picture", G_MININT, G_MAXINT, DEFAULT_PAD_YPOS, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE)); g_object_class_install_property (gobject_class, ARG_PAD_ALPHA, g_param_spec_double ("alpha", "Alpha", "Alpha of the picture", 0.0, 1.0, DEFAULT_PAD_ALPHA, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE)); } static void gst_videomixer_pad_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (object); switch (prop_id) { case ARG_PAD_ZORDER: g_value_set_uint (value, pad->zorder); break; case ARG_PAD_XPOS: g_value_set_int (value, pad->xpos); break; case ARG_PAD_YPOS: g_value_set_int (value, pad->ypos); break; case ARG_PAD_ALPHA: g_value_set_double (value, pad->alpha); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_videomixer_pad_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstVideoMixerPad *pad; GstVideoMixer *mix; pad = GST_VIDEO_MIXER_PAD (object); mix = GST_VIDEO_MIXER (gst_pad_get_parent (GST_PAD (pad))); switch (prop_id) { case ARG_PAD_ZORDER: GST_VIDEO_MIXER_STATE_LOCK (mix); pad->zorder = g_value_get_uint (value); gst_videomixer_sort_pads (mix); GST_VIDEO_MIXER_STATE_UNLOCK (mix); break; case ARG_PAD_XPOS: pad->xpos = g_value_get_int (value); break; case ARG_PAD_YPOS: pad->ypos = g_value_get_int (value); break; case ARG_PAD_ALPHA: pad->alpha = g_value_get_double (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } gst_object_unref (mix); } static void gst_videomixer_set_master_geometry (GstVideoMixer * mix) { GSList *walk; gint width = 0, height = 0, fps_n = 0, fps_d = 0; GstVideoMixerPad *master = NULL; walk = mix->sinkpads; while (walk) { GstVideoMixerPad *mixpad = GST_VIDEO_MIXER_PAD (walk->data); walk = g_slist_next (walk); /* Biggest input geometry will be our output geometry */ width = MAX (width, mixpad->in_width); height = MAX (height, mixpad->in_height); /* If mix framerate < mixpad framerate, using fractions */ GST_DEBUG_OBJECT (mix, "comparing framerate %d/%d to mixpad's %d/%d", fps_n, fps_d, mixpad->fps_n, mixpad->fps_d); if ((!fps_n && !fps_d) || ((gint64) fps_n * mixpad->fps_d < (gint64) mixpad->fps_n * fps_d)) { fps_n = mixpad->fps_n; fps_d = mixpad->fps_d; GST_DEBUG_OBJECT (mixpad, "becomes the master pad"); master = mixpad; } } /* set results */ if (mix->master != master || mix->in_width != width || mix->in_height != height || mix->fps_n != fps_n || mix->fps_d != fps_d) { mix->setcaps = TRUE; mix->sendseg = TRUE; mix->master = master; mix->in_width = width; mix->in_height = height; mix->fps_n = fps_n; mix->fps_d = fps_d; } } static gboolean gst_videomixer_pad_sink_setcaps (GstPad * pad, GstCaps * vscaps) { GstVideoMixer *mix; GstVideoMixerPad *mixpad; GstStructure *structure; gint in_width, in_height; gboolean ret = FALSE; const GValue *framerate; GST_INFO_OBJECT (pad, "setcaps:\n%" GST_PTR_FORMAT, vscaps); mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad)); mixpad = GST_VIDEO_MIXER_PAD (pad); if (!mixpad) goto beach; GST_DEBUG_OBJECT (mixpad, "setcaps triggered"); structure = gst_caps_get_structure (vscaps, 0); if (!gst_structure_get_int (structure, "width", &in_width) || !gst_structure_get_int (structure, "height", &in_height) || (framerate = gst_structure_get_value (structure, "framerate")) == NULL) goto beach; GST_VIDEO_MIXER_STATE_LOCK (mix); mixpad->fps_n = gst_value_get_fraction_numerator (framerate); mixpad->fps_d = gst_value_get_fraction_denominator (framerate); mixpad->in_width = in_width; mixpad->in_height = in_height; gst_videomixer_set_master_geometry (mix); GST_VIDEO_MIXER_STATE_UNLOCK (mix); ret = TRUE; beach: gst_object_unref (mix); return ret; } /** * We accept the caps if it has the same format as other sink pads in * the element. */ static gboolean gst_videomixer_pad_sink_acceptcaps (GstPad * pad, GstCaps * vscaps) { gboolean ret; GstVideoMixer *mix; GstCaps *acceptedCaps; mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad)); GST_DEBUG_OBJECT (pad, "TRACE: \n%" GST_PTR_FORMAT, vscaps); GST_VIDEO_MIXER_STATE_LOCK (mix); if (mix->master) { acceptedCaps = gst_pad_get_fixed_caps_func (GST_PAD (mix->master)); acceptedCaps = gst_caps_make_writable (acceptedCaps); GST_LOG ("\nmaster's caps\n%" GST_PTR_FORMAT "\n", acceptedCaps); if (GST_CAPS_IS_SIMPLE (acceptedCaps)) { int templCapsSize = gst_caps_get_size (gst_pad_get_pad_template_caps (pad)); guint i; for (i = 0; i < templCapsSize; i++) { GstCaps *caps1 = gst_caps_copy (acceptedCaps); GstCaps *caps2 = gst_caps_copy_nth (gst_pad_get_pad_template_caps (pad), i); gst_caps_merge (caps1, caps2); gst_caps_do_simplify (caps1); if (GST_CAPS_IS_SIMPLE (caps1)) { gst_caps_replace (&acceptedCaps, caps1); gst_caps_unref (caps1); break; } gst_caps_unref (caps1); } } } else { acceptedCaps = gst_pad_get_fixed_caps_func (pad); } GST_INFO ("\n\n%" GST_PTR_FORMAT "\n\n", vscaps); GST_INFO ("\n\n*********\n%" GST_PTR_FORMAT "\n\n", acceptedCaps); ret = gst_caps_is_always_compatible (vscaps, acceptedCaps); gst_caps_unref (acceptedCaps); GST_VIDEO_MIXER_STATE_UNLOCK (mix); gst_object_unref (mix); return ret; } static void gst_videomixer_pad_link (GstPad * pad, GstPad * peer, gpointer data) { GST_DEBUG_OBJECT (pad, "connected"); } static void gst_videomixer_pad_unlink (GstPad * pad, GstPad * peer, gpointer data) { GST_DEBUG_OBJECT (pad, "unlinked"); } static void gst_videomixer_pad_init (GstVideoMixerPad * mixerpad) { g_signal_connect (mixerpad, "linked", G_CALLBACK (gst_videomixer_pad_link), mixerpad); g_signal_connect (mixerpad, "unlinked", G_CALLBACK (gst_videomixer_pad_unlink), mixerpad); /* setup some pad functions */ gst_pad_set_setcaps_function (GST_PAD (mixerpad), gst_videomixer_pad_sink_setcaps); gst_pad_set_acceptcaps_function (GST_PAD (mixerpad), GST_DEBUG_FUNCPTR (gst_videomixer_pad_sink_acceptcaps)); mixerpad->zorder = DEFAULT_PAD_ZORDER; mixerpad->xpos = DEFAULT_PAD_XPOS; mixerpad->ypos = DEFAULT_PAD_YPOS; mixerpad->alpha = DEFAULT_PAD_ALPHA; } /* elementfactory information */ static const GstElementDetails gst_videomixer_details = GST_ELEMENT_DETAILS ("Video mixer", "Filter/Editor/Video", "Mix multiple video streams", "Wim Taymans "); /* VideoMixer signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; #define DEFAULT_BACKGROUND VIDEO_MIXER_BACKGROUND_CHECKER enum { ARG_0, ARG_BACKGROUND }; #define GST_TYPE_VIDEO_MIXER_BACKGROUND (gst_video_mixer_background_get_type()) static GType gst_video_mixer_background_get_type (void) { static GType video_mixer_background_type = 0; static const GEnumValue video_mixer_background[] = { {VIDEO_MIXER_BACKGROUND_CHECKER, "Checker pattern", "checker"}, {VIDEO_MIXER_BACKGROUND_BLACK, "Black", "black"}, {VIDEO_MIXER_BACKGROUND_WHITE, "White", "white"}, {0, NULL, NULL}, }; if (!video_mixer_background_type) { video_mixer_background_type = g_enum_register_static ("GstVideoMixerBackground", video_mixer_background); } return video_mixer_background_type; } static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";" GST_VIDEO_CAPS_BGRA ";" GST_VIDEO_CAPS_YUV ("I420")) ); static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%d", GST_PAD_SINK, GST_PAD_REQUEST, GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";" GST_VIDEO_CAPS_BGRA ";" GST_VIDEO_CAPS_YUV ("I420")) ); static void gst_videomixer_finalize (GObject * object); static GstCaps *gst_videomixer_getcaps (GstPad * pad); static gboolean gst_videomixer_setcaps (GstPad * pad, GstCaps * caps); static gboolean gst_videomixer_query (GstPad * pad, GstQuery * query); static GstFlowReturn gst_videomixer_collected (GstCollectPads * pads, GstVideoMixer * mix); static GstPad *gst_videomixer_request_new_pad (GstElement * element, GstPadTemplate * templ, const gchar * name); static void gst_videomixer_release_pad (GstElement * element, GstPad * pad); static void gst_videomixer_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_videomixer_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static GstStateChangeReturn gst_videomixer_change_state (GstElement * element, GstStateChange transition); /*static guint gst_videomixer_signals[LAST_SIGNAL] = { 0 }; */ static void gst_videomixer_child_proxy_init (gpointer g_iface, gpointer iface_data); static void _do_init (GType object_type); GST_BOILERPLATE_FULL (GstVideoMixer, gst_videomixer, GstElement, GST_TYPE_ELEMENT, _do_init); static void _do_init (GType object_type) { const GInterfaceInfo child_proxy_info = { (GInterfaceInitFunc) gst_videomixer_child_proxy_init, NULL, NULL }; g_type_add_interface_static (object_type, GST_TYPE_CHILD_PROXY, &child_proxy_info); GST_INFO ("GstChildProxy interface registered"); } static GstObject * gst_videomixer_child_proxy_get_child_by_index (GstChildProxy * child_proxy, guint index) { GstVideoMixer *mix = GST_VIDEO_MIXER (child_proxy); GstObject *obj; GST_VIDEO_MIXER_STATE_LOCK (mix); if ((obj = g_slist_nth_data (mix->sinkpads, index))) gst_object_ref (obj); GST_VIDEO_MIXER_STATE_UNLOCK (mix); return obj; } static guint gst_videomixer_child_proxy_get_children_count (GstChildProxy * child_proxy) { guint count = 0; GstVideoMixer *mix = GST_VIDEO_MIXER (child_proxy); GST_VIDEO_MIXER_STATE_LOCK (mix); count = mix->numpads; GST_VIDEO_MIXER_STATE_UNLOCK (mix); GST_INFO ("Children Count: %d", count); return count; } static void gst_videomixer_child_proxy_init (gpointer g_iface, gpointer iface_data) { GstChildProxyInterface *iface = g_iface; GST_INFO ("intializing child proxy interface"); iface->get_child_by_index = gst_videomixer_child_proxy_get_child_by_index; iface->get_children_count = gst_videomixer_child_proxy_get_children_count; } static void gst_videomixer_base_init (gpointer g_class) { GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&src_factory)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&sink_factory)); gst_element_class_set_details (element_class, &gst_videomixer_details); } static void gst_videomixer_class_init (GstVideoMixerClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; parent_class = g_type_class_peek_parent (klass); gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_videomixer_finalize); gobject_class->get_property = gst_videomixer_get_property; gobject_class->set_property = gst_videomixer_set_property; g_object_class_install_property (gobject_class, ARG_BACKGROUND, g_param_spec_enum ("background", "Background", "Background type", GST_TYPE_VIDEO_MIXER_BACKGROUND, DEFAULT_BACKGROUND, G_PARAM_READWRITE)); gstelement_class->request_new_pad = GST_DEBUG_FUNCPTR (gst_videomixer_request_new_pad); gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_videomixer_release_pad); gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_videomixer_change_state); /* Register the pad class */ (void) (GST_TYPE_VIDEO_MIXER_PAD); } static void gst_videomixer_collect_free (GstVideoMixerCollect * mixcol) { if (mixcol->buffer) { gst_buffer_unref (mixcol->buffer); mixcol->buffer = NULL; } } static void gst_videomixer_reset (GstVideoMixer * mix) { GSList *walk; mix->in_width = 0; mix->in_height = 0; mix->out_width = 0; mix->out_height = 0; mix->fps_n = mix->fps_d = 0; mix->setcaps = FALSE; mix->sendseg = FALSE; mix->segment_position = 0; mix->segment_rate = 1.0; mix->last_ts = 0; /* clean up collect data */ walk = mix->collect->data; while (walk) { GstVideoMixerCollect *data = (GstVideoMixerCollect *) walk->data; gst_videomixer_collect_free (data); walk = g_slist_next (walk); } mix->next_sinkpad = 0; } static void gst_videomixer_init (GstVideoMixer * mix, GstVideoMixerClass * g_class) { GstElementClass *klass = GST_ELEMENT_GET_CLASS (mix); mix->srcpad = gst_pad_new_from_template (gst_element_class_get_pad_template (klass, "src"), "src"); gst_pad_set_getcaps_function (GST_PAD (mix->srcpad), GST_DEBUG_FUNCPTR (gst_videomixer_getcaps)); gst_pad_set_setcaps_function (GST_PAD (mix->srcpad), GST_DEBUG_FUNCPTR (gst_videomixer_setcaps)); gst_pad_set_query_function (GST_PAD (mix->srcpad), GST_DEBUG_FUNCPTR (gst_videomixer_query)); gst_pad_set_event_function (GST_PAD (mix->srcpad), GST_DEBUG_FUNCPTR (gst_videomixer_src_event)); gst_element_add_pad (GST_ELEMENT (mix), mix->srcpad); mix->collect = gst_collect_pads_new (); mix->background = DEFAULT_BACKGROUND; gst_collect_pads_set_function (mix->collect, (GstCollectPadsFunction) GST_DEBUG_FUNCPTR (gst_videomixer_collected), mix); mix->state_lock = g_mutex_new (); /* initialize variables */ gst_videomixer_reset (mix); } static void gst_videomixer_finalize (GObject * object) { GstVideoMixer *mix = GST_VIDEO_MIXER (object); gst_object_unref (mix->collect); g_mutex_free (mix->state_lock); G_OBJECT_CLASS (parent_class)->finalize (object); } static gboolean gst_videomixer_query_duration (GstVideoMixer * mix, GstQuery * query) { gint64 max; gboolean res; GstFormat format; GstIterator *it; gboolean done; /* parse format */ gst_query_parse_duration (query, &format, NULL); max = -1; res = TRUE; done = FALSE; /* Take maximum of all durations */ it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (mix)); while (!done) { GstIteratorResult ires; gpointer item; ires = gst_iterator_next (it, &item); switch (ires) { case GST_ITERATOR_DONE: done = TRUE; break; case GST_ITERATOR_OK: { GstPad *pad = GST_PAD_CAST (item); gint64 duration; /* ask sink peer for duration */ res &= gst_pad_query_peer_duration (pad, &format, &duration); /* take max from all valid return values */ if (res) { /* valid unknown length, stop searching */ if (duration == -1) { max = duration; done = TRUE; } /* else see if bigger than current max */ else if (duration > max) max = duration; } gst_object_unref (pad); break; } case GST_ITERATOR_RESYNC: max = -1; res = TRUE; gst_iterator_resync (it); break; default: res = FALSE; done = TRUE; break; } } gst_iterator_free (it); if (res) { /* and store the max */ GST_DEBUG_OBJECT (mix, "Total duration in format %s: %" GST_TIME_FORMAT, gst_format_get_name (format), GST_TIME_ARGS (max)); gst_query_set_duration (query, format, max); } return res; } static gboolean gst_videomixer_query_latency (GstVideoMixer * mix, GstQuery * query) { GstClockTime min, max; gboolean live; gboolean res; GstIterator *it; gboolean done; res = TRUE; done = FALSE; live = FALSE; min = 0; max = GST_CLOCK_TIME_NONE; /* Take maximum of all latency values */ it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (mix)); while (!done) { GstIteratorResult ires; gpointer item; ires = gst_iterator_next (it, &item); switch (ires) { case GST_ITERATOR_DONE: done = TRUE; break; case GST_ITERATOR_OK: { GstPad *pad = GST_PAD_CAST (item); GstQuery *peerquery; GstClockTime min_cur, max_cur; gboolean live_cur; peerquery = gst_query_new_latency (); /* Ask peer for latency */ res &= gst_pad_peer_query (pad, peerquery); /* take max from all valid return values */ if (res) { gst_query_parse_latency (peerquery, &live_cur, &min_cur, &max_cur); if (min_cur > min) min = min_cur; if (max_cur != GST_CLOCK_TIME_NONE && ((max != GST_CLOCK_TIME_NONE && max_cur > max) || (max == GST_CLOCK_TIME_NONE))) max = max_cur; live = live || live_cur; } gst_query_unref (peerquery); gst_object_unref (pad); break; } case GST_ITERATOR_RESYNC: live = FALSE; min = 0; max = GST_CLOCK_TIME_NONE; res = TRUE; gst_iterator_resync (it); break; default: res = FALSE; done = TRUE; break; } } gst_iterator_free (it); if (res) { /* store the results */ GST_DEBUG_OBJECT (mix, "Calculated total latency: live %s, min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT, (live ? "yes" : "no"), GST_TIME_ARGS (min), GST_TIME_ARGS (max)); gst_query_set_latency (query, live, min, max); } return res; } static gboolean gst_videomixer_query (GstPad * pad, GstQuery * query) { GstVideoMixer *mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad)); gboolean res = FALSE; switch (GST_QUERY_TYPE (query)) { case GST_QUERY_POSITION: { GstFormat format; gst_query_parse_position (query, &format, NULL); switch (format) { case GST_FORMAT_TIME: /* FIXME, bring to stream time, might be tricky */ gst_query_set_position (query, format, mix->last_ts); res = TRUE; break; default: break; } break; } case GST_QUERY_DURATION: res = gst_videomixer_query_duration (mix, query); break; case GST_QUERY_LATENCY: res = gst_videomixer_query_latency (mix, query); break; default: /* FIXME, needs a custom query handler because we have multiple * sinkpads */ res = gst_pad_query_default (pad, query); break; } gst_object_unref (mix); return res; } static GstCaps * gst_videomixer_getcaps (GstPad * pad) { GstVideoMixer *mix; GstCaps *caps; GstStructure *structure; int numCaps; GST_LOG_OBJECT (pad, "TRACE"); mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad)); if (mix->master) { caps = gst_caps_copy (gst_pad_get_pad_template_caps (GST_PAD (mix->master))); } else { caps = gst_caps_copy (gst_pad_get_pad_template_caps (mix->srcpad)); } numCaps = gst_caps_get_size (caps) - 1; for (; numCaps >= 0; numCaps--) { structure = gst_caps_get_structure (caps, numCaps); if (mix->out_width != 0) { gst_structure_set (structure, "width", G_TYPE_INT, mix->out_width, NULL); } if (mix->out_height != 0) { gst_structure_set (structure, "height", G_TYPE_INT, mix->out_height, NULL); } if (mix->fps_d != 0) { gst_structure_set (structure, "framerate", GST_TYPE_FRACTION, mix->fps_n, mix->fps_d, NULL); } } gst_object_unref (mix); return caps; } static gboolean gst_videomixer_setcaps (GstPad * pad, GstCaps * caps) { GstElement *element; GstVideoMixer *mixer; GstStructure *str; element = gst_pad_get_parent_element (pad); g_assert (element); mixer = GST_VIDEO_MIXER (element); g_assert (mixer); GST_INFO_OBJECT (mixer, "set src caps: \n%" GST_PTR_FORMAT, caps); str = gst_caps_get_structure (caps, 0); if (gst_structure_has_name (str, "video/x-raw-yuv")) { guint32 format; int ret; ret = gst_structure_get_fourcc (str, "format", &format); if (!ret) { mixer->blend = NULL; mixer->fill_checker = NULL; mixer->fill_color = NULL; mixer->calculate_frame_size = NULL; } else if (format == GST_STR_FOURCC ("AYUV")) { mixer->blend = gst_videomixer_blend_ayuv_ayuv; mixer->fill_checker = gst_videomixer_fill_ayuv_checker; mixer->fill_color = gst_videomixer_fill_ayuv_color; mixer->calculate_frame_size = gst_videomixer_calculate_frame_size_ayuv; } else if (format == GST_STR_FOURCC ("I420")) { mixer->blend = gst_videomixer_blend_i420_i420; mixer->fill_checker = gst_videomixer_fill_i420_checker; mixer->fill_color = gst_videomixer_fill_i420_color; mixer->calculate_frame_size = gst_videomixer_calculate_frame_size_i420; } else { mixer->blend = NULL; mixer->fill_checker = NULL; mixer->fill_color = NULL; mixer->calculate_frame_size = NULL; } } else if (gst_structure_has_name (str, "video/x-raw-rgb")) { mixer->blend = gst_videomixer_blend_bgra_bgra; mixer->fill_checker = gst_videomixer_fill_bgra_checker; mixer->fill_color = gst_videomixer_fill_bgra_color; mixer->calculate_frame_size = gst_videomixer_calculate_frame_size_bgra; } else { mixer->blend = NULL; mixer->fill_checker = NULL; mixer->fill_color = NULL; mixer->calculate_frame_size = NULL; } gst_object_unref (element); return TRUE; } static GstPad * gst_videomixer_request_new_pad (GstElement * element, GstPadTemplate * templ, const gchar * req_name) { GstVideoMixer *mix = NULL; GstVideoMixerPad *mixpad = NULL; GstElementClass *klass = GST_ELEMENT_GET_CLASS (element); g_return_val_if_fail (templ != NULL, NULL); if (templ->direction != GST_PAD_SINK) { g_warning ("videomixer: request pad that is not a SINK pad\n"); return NULL; } g_return_val_if_fail (GST_IS_VIDEO_MIXER (element), NULL); mix = GST_VIDEO_MIXER (element); if (templ == gst_element_class_get_pad_template (klass, "sink_%d")) { gint serial = 0; gchar *name = NULL; GstVideoMixerCollect *mixcol = NULL; if (req_name == NULL || strlen (req_name) < 6) { /* no name given when requesting the pad, use next available int */ serial = mix->next_sinkpad++; } else { /* parse serial number from requested padname */ serial = atoi (&req_name[5]); if (serial >= mix->next_sinkpad) mix->next_sinkpad = serial + 1; } /* create new pad with the name */ name = g_strdup_printf ("sink_%d", serial); mixpad = g_object_new (GST_TYPE_VIDEO_MIXER_PAD, "name", name, "direction", templ->direction, "template", templ, NULL); g_free (name); GST_VIDEO_MIXER_STATE_LOCK (mix); mixpad->zorder = mix->numpads; mixpad->xpos = DEFAULT_PAD_XPOS; mixpad->ypos = DEFAULT_PAD_YPOS; mixpad->alpha = DEFAULT_PAD_ALPHA; mixcol = (GstVideoMixerCollect *) gst_collect_pads_add_pad (mix->collect, GST_PAD (mixpad), sizeof (GstVideoMixerCollect)); /* FIXME: hacked way to override/extend the event function of * GstCollectPads; because it sets its own event function giving the * element no access to events */ mix->collect_event = (GstPadEventFunction) GST_PAD_EVENTFUNC (GST_PAD (mixpad)); gst_pad_set_event_function (GST_PAD (mixpad), GST_DEBUG_FUNCPTR (gst_videomixer_sink_event)); /* Keep track of each other */ mixcol->mixpad = mixpad; mixpad->mixcol = mixcol; /* Keep an internal list of mixpads for zordering */ mix->sinkpads = g_slist_append (mix->sinkpads, mixpad); mix->numpads++; GST_VIDEO_MIXER_STATE_UNLOCK (mix); } else { g_warning ("videomixer: this is not our template!\n"); return NULL; } /* add the pad to the element */ gst_element_add_pad (element, GST_PAD (mixpad)); gst_child_proxy_child_added (GST_OBJECT (mix), GST_OBJECT (mixpad)); return GST_PAD (mixpad); } static void gst_videomixer_release_pad (GstElement * element, GstPad * pad) { GstVideoMixer *mix = NULL; GstVideoMixerPad *mixpad; mix = GST_VIDEO_MIXER (element); GST_VIDEO_MIXER_STATE_LOCK (mix); if (G_UNLIKELY (g_slist_find (mix->sinkpads, pad) == NULL)) { g_warning ("Unknown pad %s", GST_PAD_NAME (pad)); goto error; } mixpad = GST_VIDEO_MIXER_PAD (pad); mix->sinkpads = g_slist_remove (mix->sinkpads, pad); gst_videomixer_collect_free (mixpad->mixcol); gst_collect_pads_remove_pad (mix->collect, pad); gst_child_proxy_child_removed (GST_OBJECT (mix), GST_OBJECT (mixpad)); /* determine possibly new geometry and master */ gst_videomixer_set_master_geometry (mix); mix->numpads--; GST_VIDEO_MIXER_STATE_UNLOCK (mix); gst_element_remove_pad (element, pad); return; error: GST_VIDEO_MIXER_STATE_UNLOCK (mix); } static int pad_zorder_compare (const GstVideoMixerPad * pad1, const GstVideoMixerPad * pad2) { return pad1->zorder - pad2->zorder; } static void gst_videomixer_sort_pads (GstVideoMixer * mix) { mix->sinkpads = g_slist_sort (mix->sinkpads, (GCompareFunc) pad_zorder_compare); } /* try to get a buffer on all pads. As long as the queued value is * negative, we skip buffers */ static gboolean gst_videomixer_fill_queues (GstVideoMixer * mix) { GSList *walk = NULL; gboolean eos = TRUE; g_return_val_if_fail (GST_IS_VIDEO_MIXER (mix), FALSE); /* try to make sure we have a buffer from each usable pad first */ walk = mix->collect->data; while (walk) { GstCollectData *data = (GstCollectData *) walk->data; GstVideoMixerCollect *mixcol = (GstVideoMixerCollect *) data; GstVideoMixerPad *mixpad = mixcol->mixpad; walk = g_slist_next (walk); if (mixcol->buffer == NULL) { GstBuffer *buf = NULL; GST_LOG ("we need a new buffer"); buf = gst_collect_pads_pop (mix->collect, data); if (buf) { guint64 duration; GST_LOG ("we have a buffer !"); mixcol->buffer = buf; duration = GST_BUFFER_DURATION (mixcol->buffer); /* no duration on the buffer, use the framerate */ if (!GST_CLOCK_TIME_IS_VALID (duration)) { if (mixpad->fps_n == 0) { duration = GST_CLOCK_TIME_NONE; } else { duration = GST_SECOND * mixpad->fps_d / mixpad->fps_n; } } if (GST_CLOCK_TIME_IS_VALID (duration)) mixpad->queued += duration; else if (!mixpad->queued) mixpad->queued = GST_CLOCK_TIME_NONE; } else { GST_LOG ("pop returned a NULL buffer"); } } if (mix->sendseg && (mixpad == mix->master)) { GstEvent *event; gint64 stop, start; GstSegment *segment = &data->segment; /* FIXME, use rate/applied_rate as set on all sinkpads. * - currently we just set rate as received from last seek-event * We could potentially figure out the duration as well using * the current segment positions and the stated stop positions. * Also we just start from stream time 0 which is rather * weird. For non-synchronized mixing, the time should be * the min of the stream times of all received segments, * rationale being that the duration is at least going to * be as long as the earliest stream we start mixing. This * would also be correct for synchronized mixing but then * the later streams would be delayed until the stream times * match. */ GST_INFO ("_sending play segment"); start = segment->accum; /* get the duration of the segment if we can and add it to the accumulated * time on the segment. */ if (segment->stop != -1 && segment->start != -1) stop = start + (segment->stop - segment->start); else stop = -1; event = gst_event_new_new_segment_full (FALSE, segment->rate, 1.0, segment->format, start, stop, start + mix->segment_position); gst_pad_push_event (mix->srcpad, event); mix->sendseg = FALSE; } if (mixcol->buffer != NULL && GST_CLOCK_TIME_IS_VALID (mixpad->queued)) { /* got a buffer somewhere so we're not eos */ eos = FALSE; } } return eos; } /* blend all buffers present on the pads */ static void gst_videomixer_blend_buffers (GstVideoMixer * mix, GstBuffer * outbuf) { GSList *walk; walk = mix->sinkpads; while (walk) { /* We walk with this list because it's ordered */ GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data); GstVideoMixerCollect *mixcol = pad->mixcol; walk = g_slist_next (walk); if (mixcol->buffer != NULL) { GstClockTime timestamp; gint64 stream_time; GstSegment *seg; seg = &mixcol->collect.segment; timestamp = GST_BUFFER_TIMESTAMP (mixcol->buffer); stream_time = gst_segment_to_stream_time (seg, GST_FORMAT_TIME, timestamp); /* sync object properties on stream time */ if (GST_CLOCK_TIME_IS_VALID (stream_time)) gst_object_sync_values (G_OBJECT (pad), stream_time); if (G_UNLIKELY (mix->blend == NULL)) { GST_ERROR_OBJECT (mix, "blend function not set"); } else { (mix->blend) (GST_BUFFER_DATA (mixcol->buffer), pad->xpos, pad->ypos, pad->in_width, pad->in_height, pad->alpha, GST_BUFFER_DATA (outbuf), mix->out_width, mix->out_height); } if (pad == mix->master) { gint64 running_time; running_time = gst_segment_to_running_time (seg, GST_FORMAT_TIME, timestamp); /* outgoing buffers need the running_time */ GST_BUFFER_TIMESTAMP (outbuf) = running_time; GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (mixcol->buffer); mix->last_ts = running_time; if (GST_BUFFER_DURATION_IS_VALID (outbuf)) mix->last_ts += GST_BUFFER_DURATION (outbuf); } } } } /* remove buffers from the queue that were expired in the * interval of the master, we also prepare the queued value * in the pad so that we can skip and fill buffers later on */ static void gst_videomixer_update_queues (GstVideoMixer * mix) { GSList *walk; guint64 interval; interval = mix->master->queued; if (interval <= 0) { if (mix->fps_n == 0) { interval = G_MAXINT64; } else { interval = GST_SECOND * mix->fps_d / mix->fps_n; } GST_LOG_OBJECT (mix, "set interval to %" G_GUINT64_FORMAT, interval); } walk = mix->sinkpads; while (walk) { GstVideoMixerPad *pad = GST_VIDEO_MIXER_PAD (walk->data); GstVideoMixerCollect *mixcol = pad->mixcol; walk = g_slist_next (walk); if (mixcol->buffer != NULL) { pad->queued -= interval; GST_LOG_OBJECT (pad, "queued now %" G_GINT64_FORMAT, pad->queued); if (pad->queued <= 0) { GST_LOG ("unreffing buffer"); gst_buffer_unref (mixcol->buffer); mixcol->buffer = NULL; } } } } static GstFlowReturn gst_videomixer_collected (GstCollectPads * pads, GstVideoMixer * mix) { GstFlowReturn ret = GST_FLOW_OK; GstBuffer *outbuf = NULL; size_t outsize = 0; gboolean eos = FALSE; g_return_val_if_fail (GST_IS_VIDEO_MIXER (mix), GST_FLOW_ERROR); GST_LOG ("all pads are collected"); GST_VIDEO_MIXER_STATE_LOCK (mix); eos = gst_videomixer_fill_queues (mix); if (eos) { /* Push EOS downstream */ GST_LOG ("all our sinkpads are EOS, pushing downstream"); gst_pad_push_event (mix->srcpad, gst_event_new_eos ()); ret = GST_FLOW_WRONG_STATE; goto error; } /* If geometry has changed we need to set new caps on the buffer */ if (mix->in_width != mix->out_width || mix->in_height != mix->out_height || mix->setcaps) { GstCaps *newcaps = NULL; newcaps = gst_caps_make_writable (gst_pad_get_negotiated_caps (GST_PAD (mix->master))); gst_caps_set_simple (newcaps, "width", G_TYPE_INT, mix->in_width, "height", G_TYPE_INT, mix->in_height, NULL); mix->out_width = mix->in_width; mix->out_height = mix->in_height; mix->setcaps = FALSE; /* Calculating out buffer size from input size */ gst_pad_set_caps (mix->srcpad, newcaps); outsize = mix->calculate_frame_size (mix->out_width, mix->out_height); ret = gst_pad_alloc_buffer_and_set_caps (mix->srcpad, GST_BUFFER_OFFSET_NONE, outsize, newcaps, &outbuf); gst_caps_unref (newcaps); } else { /* Otherwise we just allocate a buffer from current caps */ /* Calculating out buffer size from input size */ outsize = mix->calculate_frame_size (mix->out_width, mix->out_height); ret = gst_pad_alloc_buffer_and_set_caps (mix->srcpad, GST_BUFFER_OFFSET_NONE, outsize, GST_PAD_CAPS (mix->srcpad), &outbuf); } if (ret != GST_FLOW_OK) { goto error; } switch (mix->background) { case VIDEO_MIXER_BACKGROUND_CHECKER: if (G_UNLIKELY (mix->fill_checker == NULL)) { goto error; } else { mix->fill_checker (GST_BUFFER_DATA (outbuf), mix->out_width, mix->out_height); } break; case VIDEO_MIXER_BACKGROUND_BLACK: if (G_UNLIKELY (mix->fill_color == NULL)) { goto error; } else { mix->fill_color (GST_BUFFER_DATA (outbuf), mix->out_width, mix->out_height, 16, 128, 128); } break; case VIDEO_MIXER_BACKGROUND_WHITE: if (G_UNLIKELY (mix->fill_color == NULL)) { goto error; } else { mix->fill_color (GST_BUFFER_DATA (outbuf), mix->out_width, mix->out_height, 240, 128, 128); } break; } gst_videomixer_blend_buffers (mix, outbuf); gst_videomixer_update_queues (mix); GST_VIDEO_MIXER_STATE_UNLOCK (mix); ret = gst_pad_push (mix->srcpad, outbuf); beach: return ret; /* ERRORS */ error: { GST_VIDEO_MIXER_STATE_UNLOCK (mix); goto beach; } } static gboolean forward_event_func (GstPad * pad, GValue * ret, GstEvent * event) { gst_event_ref (event); GST_LOG_OBJECT (pad, "About to send event %s", GST_EVENT_TYPE_NAME (event)); if (!gst_pad_push_event (pad, event)) { g_value_set_boolean (ret, FALSE); GST_WARNING_OBJECT (pad, "Sending event %p (%s) failed.", event, GST_EVENT_TYPE_NAME (event)); } else { GST_LOG_OBJECT (pad, "Sent event %p (%s).", event, GST_EVENT_TYPE_NAME (event)); } gst_object_unref (pad); return TRUE; } /* forwards the event to all sinkpads, takes ownership of the * event * * Returns: TRUE if the event could be forwarded on all * sinkpads. */ static gboolean forward_event (GstVideoMixer * mix, GstEvent * event) { GstIterator *it; GValue vret = { 0 }; GST_LOG_OBJECT (mix, "Forwarding event %p (%s)", event, GST_EVENT_TYPE_NAME (event)); g_value_init (&vret, G_TYPE_BOOLEAN); g_value_set_boolean (&vret, TRUE); it = gst_element_iterate_sink_pads (GST_ELEMENT_CAST (mix)); gst_iterator_fold (it, (GstIteratorFoldFunction) forward_event_func, &vret, event); gst_iterator_free (it); gst_event_unref (event); return g_value_get_boolean (&vret); } static gboolean gst_videomixer_src_event (GstPad * pad, GstEvent * event) { GstVideoMixer *mix; gboolean result; mix = GST_VIDEO_MIXER (gst_pad_get_parent (pad)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_QOS: /* QoS might be tricky */ result = FALSE; break; case GST_EVENT_SEEK: { GstSeekFlags flags; GstSeekType curtype; gint64 cur; /* parse the seek parameters */ gst_event_parse_seek (event, NULL, NULL, &flags, &curtype, &cur, NULL, NULL); /* check if we are flushing */ if (flags & GST_SEEK_FLAG_FLUSH) { /* make sure we accept nothing anymore and return WRONG_STATE */ gst_collect_pads_set_flushing (mix->collect, TRUE); /* flushing seek, start flush downstream, the flush will be done * when all pads received a FLUSH_STOP. */ gst_pad_push_event (mix->srcpad, gst_event_new_flush_start ()); } /* now wait for the collected to be finished and mark a new * segment */ GST_OBJECT_LOCK (mix->collect); if (curtype == GST_SEEK_TYPE_SET) mix->segment_position = cur; else mix->segment_position = 0; mix->sendseg = TRUE; GST_OBJECT_UNLOCK (mix->collect); result = forward_event (mix, event); break; } case GST_EVENT_NAVIGATION: /* navigation is rather pointless. */ result = FALSE; break; default: /* just forward the rest for now */ result = forward_event (mix, event); break; } gst_object_unref (mix); return result; } static gboolean gst_videomixer_sink_event (GstPad * pad, GstEvent * event) { GstVideoMixer *videomixer; gboolean ret; videomixer = GST_VIDEO_MIXER (gst_pad_get_parent (pad)); GST_DEBUG ("Got %s event on pad %s:%s", GST_EVENT_TYPE_NAME (event), GST_DEBUG_PAD_NAME (pad)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_STOP: /* mark a pending new segment. This event is synchronized * with the streaming thread so we can safely update the * variable without races. It's somewhat weird because we * assume the collectpads forwarded the FLUSH_STOP past us * and downstream (using our source pad, the bastard!). */ videomixer->sendseg = TRUE; break; case GST_EVENT_NEWSEGMENT: videomixer->sendseg = TRUE; break; default: break; } /* now GstCollectPads can take care of the rest, e.g. EOS */ ret = videomixer->collect_event (pad, event); gst_object_unref (videomixer); return ret; } static void gst_videomixer_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstVideoMixer *mix = GST_VIDEO_MIXER (object); switch (prop_id) { case ARG_BACKGROUND: g_value_set_enum (value, mix->background); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_videomixer_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstVideoMixer *mix = GST_VIDEO_MIXER (object); switch (prop_id) { case ARG_BACKGROUND: mix->background = g_value_get_enum (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstStateChangeReturn gst_videomixer_change_state (GstElement * element, GstStateChange transition) { GstVideoMixer *mix; GstStateChangeReturn ret; g_return_val_if_fail (GST_IS_VIDEO_MIXER (element), GST_STATE_CHANGE_FAILURE); mix = GST_VIDEO_MIXER (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: GST_LOG ("starting collectpads"); gst_collect_pads_start (mix->collect); break; case GST_STATE_CHANGE_PAUSED_TO_READY: GST_LOG ("stopping collectpads"); gst_collect_pads_stop (mix->collect); break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: gst_videomixer_reset (mix); break; default: break; } return ret; } static gboolean plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_videomixer_debug, "videomixer", 0, "video mixer"); return gst_element_register (plugin, "videomixer", GST_RANK_PRIMARY, GST_TYPE_VIDEO_MIXER); } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "videomixer", "Video mixer", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)