/* GStreamer DVB subtitles overlay * Copyright (c) 2010 Mart Raudsepp * Copyright (c) 2010 ONELAN Ltd. * * 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-dvbsuboverlay * * Renders DVB subtitles on top of a video stream. * * * Example launch line * |[ FIXME * gst-launch-1.0 -v filesrc location=/path/to/ts ! mpegtsdemux name=d ! queue ! mp3parse ! mad ! audioconvert ! autoaudiosink \ * d. ! queue ! mpeg2dec ! videoconvert ! r. \ * d. ! queue ! "subpicture/x-dvb" ! dvbsuboverlay name=r ! videoconvert ! autovideosink * ]| This pipeline demuxes a MPEG-TS file with MPEG2 video, MP3 audio and embedded DVB subtitles and renders the subtitles on top of the video. * */ #ifdef HAVE_CONFIG_H # include #endif #include #include "gstdvbsuboverlay.h" #include #include GST_DEBUG_CATEGORY_STATIC (gst_dvbsub_overlay_debug); #define GST_CAT_DEFAULT gst_dvbsub_overlay_debug /* Filter signals and props */ enum { LAST_SIGNAL }; enum { PROP_0, PROP_ENABLE, PROP_MAX_PAGE_TIMEOUT, PROP_FORCE_END }; #define DEFAULT_ENABLE (TRUE) #define DEFAULT_MAX_PAGE_TIMEOUT (0) #define DEFAULT_FORCE_END (FALSE) #define VIDEO_FORMATS GST_VIDEO_OVERLAY_COMPOSITION_BLEND_FORMATS #define DVBSUB_OVERLAY_CAPS GST_VIDEO_CAPS_MAKE(VIDEO_FORMATS) #define DVBSUB_OVERLAY_ALL_CAPS DVBSUB_OVERLAY_CAPS ";" \ GST_VIDEO_CAPS_MAKE_WITH_FEATURES ("ANY", GST_VIDEO_FORMATS_ALL) static GstStaticCaps sw_template_caps = GST_STATIC_CAPS (DVBSUB_OVERLAY_CAPS); static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS (DVBSUB_OVERLAY_ALL_CAPS) ); static GstStaticPadTemplate video_sink_factory = GST_STATIC_PAD_TEMPLATE ("video_sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS (DVBSUB_OVERLAY_ALL_CAPS) ); static GstStaticPadTemplate text_sink_factory = GST_STATIC_PAD_TEMPLATE ("text_sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("subpicture/x-dvb") ); static void gst_dvbsub_overlay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_dvbsub_overlay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_dvbsub_overlay_finalize (GObject * object); static GstStateChangeReturn gst_dvbsub_overlay_change_state (GstElement * element, GstStateChange transition); #define gst_dvbsub_overlay_parent_class parent_class G_DEFINE_TYPE (GstDVBSubOverlay, gst_dvbsub_overlay, GST_TYPE_ELEMENT); static GstCaps *gst_dvbsub_overlay_get_videosink_caps (GstDVBSubOverlay * render, GstPad * pad, GstCaps * filter); static GstCaps *gst_dvbsub_overlay_get_src_caps (GstDVBSubOverlay * render, GstPad * pad, GstCaps * filter); static GstFlowReturn gst_dvbsub_overlay_chain_video (GstPad * pad, GstObject * parent, GstBuffer * buf); static GstFlowReturn gst_dvbsub_overlay_chain_text (GstPad * pad, GstObject * parent, GstBuffer * buf); static gboolean gst_dvbsub_overlay_event_video (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_dvbsub_overlay_event_text (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_dvbsub_overlay_event_src (GstPad * pad, GstObject * parent, GstEvent * event); static void new_dvb_subtitles_cb (DvbSub * dvb_sub, DVBSubtitles * subs, gpointer user_data); static gboolean gst_dvbsub_overlay_query_video (GstPad * pad, GstObject * parent, GstQuery * query); static gboolean gst_dvbsub_overlay_query_src (GstPad * pad, GstObject * parent, GstQuery * query); /* initialize the plugin's class */ static void gst_dvbsub_overlay_class_init (GstDVBSubOverlayClass * klass) { GObjectClass *gobject_class = (GObjectClass *) klass; GstElementClass *gstelement_class = (GstElementClass *) klass; gobject_class->set_property = gst_dvbsub_overlay_set_property; gobject_class->get_property = gst_dvbsub_overlay_get_property; gobject_class->finalize = gst_dvbsub_overlay_finalize; g_object_class_install_property (gobject_class, PROP_ENABLE, g_param_spec_boolean ("enable", "Enable", /* FIXME: "enable" vs "silent"? */ "Enable rendering of subtitles", DEFAULT_ENABLE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_MAX_PAGE_TIMEOUT, g_param_spec_int ("max-page-timeout", "max-page-timeout", "Limit maximum display time of a subtitle page (0 - disabled, value in seconds)", 0, G_MAXINT, DEFAULT_MAX_PAGE_TIMEOUT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_FORCE_END, g_param_spec_boolean ("force-end", "Force End", "Assume PES-aligned subtitles and force end-of-display", DEFAULT_FORCE_END, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_dvbsub_overlay_change_state); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&src_factory)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&video_sink_factory)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&text_sink_factory)); gst_element_class_set_static_metadata (gstelement_class, "DVB Subtitles Overlay", "Mixer/Video/Overlay/Subtitle", "Renders DVB subtitles", "Mart Raudsepp "); } static void gst_dvbsub_overlay_flush_subtitles (GstDVBSubOverlay * render) { DVBSubtitles *subs; g_mutex_lock (&render->dvbsub_mutex); while ((subs = g_queue_pop_head (render->pending_subtitles))) { dvb_subtitles_free (subs); } if (render->current_subtitle) dvb_subtitles_free (render->current_subtitle); render->current_subtitle = NULL; if (render->current_comp) gst_video_overlay_composition_unref (render->current_comp); render->current_comp = NULL; if (render->dvb_sub) dvb_sub_free (render->dvb_sub); render->dvb_sub = dvb_sub_new (); { DvbSubCallbacks dvbsub_callbacks = { &new_dvb_subtitles_cb, }; dvb_sub_set_callbacks (render->dvb_sub, &dvbsub_callbacks, render); } render->last_text_pts = GST_CLOCK_TIME_NONE; render->pending_sub = FALSE; g_mutex_unlock (&render->dvbsub_mutex); } static void gst_dvbsub_overlay_init (GstDVBSubOverlay * render) { GST_DEBUG_OBJECT (render, "init"); render->srcpad = gst_pad_new_from_static_template (&src_factory, "src"); render->video_sinkpad = gst_pad_new_from_static_template (&video_sink_factory, "video_sink"); render->text_sinkpad = gst_pad_new_from_static_template (&text_sink_factory, "text_sink"); gst_pad_set_chain_function (render->video_sinkpad, GST_DEBUG_FUNCPTR (gst_dvbsub_overlay_chain_video)); gst_pad_set_chain_function (render->text_sinkpad, GST_DEBUG_FUNCPTR (gst_dvbsub_overlay_chain_text)); gst_pad_set_event_function (render->video_sinkpad, GST_DEBUG_FUNCPTR (gst_dvbsub_overlay_event_video)); gst_pad_set_event_function (render->text_sinkpad, GST_DEBUG_FUNCPTR (gst_dvbsub_overlay_event_text)); gst_pad_set_event_function (render->srcpad, GST_DEBUG_FUNCPTR (gst_dvbsub_overlay_event_src)); gst_pad_set_query_function (render->video_sinkpad, GST_DEBUG_FUNCPTR (gst_dvbsub_overlay_query_video)); gst_pad_set_query_function (render->srcpad, GST_DEBUG_FUNCPTR (gst_dvbsub_overlay_query_src)); GST_PAD_SET_PROXY_ALLOCATION (render->video_sinkpad); gst_element_add_pad (GST_ELEMENT (render), render->srcpad); gst_element_add_pad (GST_ELEMENT (render), render->video_sinkpad); gst_element_add_pad (GST_ELEMENT (render), render->text_sinkpad); gst_video_info_init (&render->info); render->current_subtitle = NULL; render->pending_subtitles = g_queue_new (); render->enable = DEFAULT_ENABLE; render->max_page_timeout = DEFAULT_MAX_PAGE_TIMEOUT; render->force_end = DEFAULT_FORCE_END; g_mutex_init (&render->dvbsub_mutex); gst_dvbsub_overlay_flush_subtitles (render); gst_segment_init (&render->video_segment, GST_FORMAT_TIME); gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME); GST_DEBUG_OBJECT (render, "init complete"); } static void gst_dvbsub_overlay_finalize (GObject * object) { GstDVBSubOverlay *overlay = GST_DVBSUB_OVERLAY (object); DVBSubtitles *subs; while ((subs = g_queue_pop_head (overlay->pending_subtitles))) { dvb_subtitles_free (subs); } g_queue_free (overlay->pending_subtitles); if (overlay->current_subtitle) dvb_subtitles_free (overlay->current_subtitle); overlay->current_subtitle = NULL; if (overlay->current_comp) gst_video_overlay_composition_unref (overlay->current_comp); overlay->current_comp = NULL; if (overlay->dvb_sub) dvb_sub_free (overlay->dvb_sub); g_mutex_clear (&overlay->dvbsub_mutex); G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_dvbsub_overlay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstDVBSubOverlay *overlay = GST_DVBSUB_OVERLAY (object); switch (prop_id) { case PROP_ENABLE: g_atomic_int_set (&overlay->enable, g_value_get_boolean (value)); break; case PROP_MAX_PAGE_TIMEOUT: g_atomic_int_set (&overlay->max_page_timeout, g_value_get_int (value)); break; case PROP_FORCE_END: g_atomic_int_set (&overlay->force_end, g_value_get_boolean (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_dvbsub_overlay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstDVBSubOverlay *overlay = GST_DVBSUB_OVERLAY (object); switch (prop_id) { case PROP_ENABLE: g_value_set_boolean (value, g_atomic_int_get (&overlay->enable)); break; case PROP_MAX_PAGE_TIMEOUT: g_value_set_int (value, g_atomic_int_get (&overlay->max_page_timeout)); break; case PROP_FORCE_END: g_value_set_boolean (value, g_atomic_int_get (&overlay->force_end)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstStateChangeReturn gst_dvbsub_overlay_change_state (GstElement * element, GstStateChange transition) { GstDVBSubOverlay *render = GST_DVBSUB_OVERLAY (element); GstStateChangeReturn ret; switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: gst_segment_init (&render->video_segment, GST_FORMAT_TIME); gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME); break; case GST_STATE_CHANGE_NULL_TO_READY: case GST_STATE_CHANGE_PAUSED_TO_PLAYING: default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: gst_dvbsub_overlay_flush_subtitles (render); gst_segment_init (&render->video_segment, GST_FORMAT_TIME); gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME); gst_video_info_init (&render->info); break; case GST_STATE_CHANGE_PLAYING_TO_PAUSED: case GST_STATE_CHANGE_READY_TO_NULL: default: break; } return ret; } static gboolean gst_dvbsub_overlay_query_src (GstPad * pad, GstObject * parent, GstQuery * query) { GstDVBSubOverlay *render = GST_DVBSUB_OVERLAY (parent); gboolean ret; switch (GST_QUERY_TYPE (query)) { case GST_QUERY_CAPS: { GstCaps *filter, *caps; gst_query_parse_caps (query, &filter); caps = gst_dvbsub_overlay_get_src_caps (render, pad, filter); gst_query_set_caps_result (query, caps); gst_caps_unref (caps); ret = TRUE; break; } default: ret = gst_pad_query_default (pad, parent, query); break; } return ret; } static gboolean gst_dvbsub_overlay_event_src (GstPad * pad, GstObject * parent, GstEvent * event) { GstDVBSubOverlay *render = GST_DVBSUB_OVERLAY (parent); gboolean ret = FALSE; gst_event_ref (event); ret = gst_pad_push_event (render->video_sinkpad, event); gst_pad_push_event (render->text_sinkpad, event); return ret; } /** * gst_dvbsub_overlay_add_feature_and_intersect: * * Creates a new #GstCaps containing the (given caps + * given caps feature) + (given caps intersected by the * given filter). * * Returns: the new #GstCaps */ static GstCaps * gst_dvbsub_overlay_add_feature_and_intersect (GstCaps * caps, const gchar * feature, GstCaps * filter) { int i, caps_size; GstCaps *new_caps; new_caps = gst_caps_copy (caps); caps_size = gst_caps_get_size (new_caps); for (i = 0; i < caps_size; i++) { GstCapsFeatures *features = gst_caps_get_features (new_caps, i); if (!gst_caps_features_is_any (features)) { gst_caps_features_add (features, feature); } } gst_caps_append (new_caps, gst_caps_intersect_full (caps, filter, GST_CAPS_INTERSECT_FIRST)); return new_caps; } /** * gst_dvbsub_overlay_intersect_by_feature: * * Creates a new #GstCaps based on the following filtering rule. * * For each individual caps contained in given caps, if the * caps uses the given caps feature, keep a version of the caps * with the feature and an another one without. Otherwise, intersect * the caps with the given filter. * * Returns: the new #GstCaps */ static GstCaps * gst_dvbsub_overlay_intersect_by_feature (GstCaps * caps, const gchar * feature, GstCaps * filter) { int i, caps_size; GstCaps *new_caps; new_caps = gst_caps_new_empty (); caps_size = gst_caps_get_size (caps); for (i = 0; i < caps_size; i++) { GstStructure *caps_structure = gst_caps_get_structure (caps, i); GstCapsFeatures *caps_features = gst_caps_features_copy (gst_caps_get_features (caps, i)); GstCaps *filtered_caps; GstCaps *simple_caps = gst_caps_new_full (gst_structure_copy (caps_structure), NULL); gst_caps_set_features (simple_caps, 0, caps_features); if (gst_caps_features_contains (caps_features, feature)) { gst_caps_append (new_caps, gst_caps_copy (simple_caps)); gst_caps_features_remove (caps_features, feature); filtered_caps = gst_caps_ref (simple_caps); } else { filtered_caps = gst_caps_intersect_full (simple_caps, filter, GST_CAPS_INTERSECT_FIRST); } gst_caps_unref (simple_caps); gst_caps_append (new_caps, filtered_caps); } return new_caps; } static GstCaps * gst_dvbsub_overlay_get_videosink_caps (GstDVBSubOverlay * render, GstPad * pad, GstCaps * filter) { GstPad *srcpad = render->srcpad; GstCaps *peer_caps = NULL, *caps = NULL, *dvdsub_overlay_filter = NULL; if (filter) { /* filter caps + composition feature + filter caps * filtered by the software caps. */ GstCaps *sw_caps = gst_static_caps_get (&sw_template_caps); dvdsub_overlay_filter = gst_dvbsub_overlay_add_feature_and_intersect (filter, GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION, sw_caps); gst_caps_unref (sw_caps); GST_DEBUG_OBJECT (render, "dvdsub_overlay filter %" GST_PTR_FORMAT, dvdsub_overlay_filter); } peer_caps = gst_pad_peer_query_caps (srcpad, dvdsub_overlay_filter); if (dvdsub_overlay_filter) gst_caps_unref (dvdsub_overlay_filter); if (peer_caps) { GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, peer_caps); if (gst_caps_is_any (peer_caps)) { /* if peer returns ANY caps, return filtered src pad template caps */ caps = gst_pad_get_pad_template_caps (srcpad); } else { /* duplicate caps which contains the composition into one version with * the meta and one without. Filter the other caps by the software caps */ GstCaps *sw_caps = gst_static_caps_get (&sw_template_caps); caps = gst_dvbsub_overlay_intersect_by_feature (peer_caps, GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION, sw_caps); gst_caps_unref (sw_caps); } gst_caps_unref (peer_caps); } else { /* no peer, our padtemplate is enough then */ caps = gst_pad_get_pad_template_caps (pad); } if (filter) { GstCaps *intersection; intersection = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST); gst_caps_unref (caps); caps = intersection; } GST_DEBUG_OBJECT (render, "returning %" GST_PTR_FORMAT, caps); return caps; } static GstCaps * gst_dvbsub_overlay_get_src_caps (GstDVBSubOverlay * render, GstPad * pad, GstCaps * filter) { GstPad *sinkpad = render->video_sinkpad; GstCaps *peer_caps = NULL, *caps = NULL, *dvdsub_overlay_filter = NULL; if (filter) { /* duplicate filter caps which contains the composition into one version * with the meta and one without. Filter the other caps by the software * caps */ GstCaps *sw_caps = gst_static_caps_get (&sw_template_caps); dvdsub_overlay_filter = gst_dvbsub_overlay_intersect_by_feature (filter, GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION, sw_caps); gst_caps_unref (sw_caps); } peer_caps = gst_pad_peer_query_caps (sinkpad, dvdsub_overlay_filter); if (dvdsub_overlay_filter) gst_caps_unref (dvdsub_overlay_filter); if (peer_caps) { GST_DEBUG_OBJECT (pad, "peer caps %" GST_PTR_FORMAT, peer_caps); if (gst_caps_is_any (peer_caps)) { /* if peer returns ANY caps, return filtered sink pad template caps */ caps = gst_pad_get_pad_template_caps (sinkpad); } else { /* return upstream caps + composition feature + upstream caps * filtered by the software caps. */ GstCaps *sw_caps = gst_static_caps_get (&sw_template_caps); caps = gst_dvbsub_overlay_add_feature_and_intersect (peer_caps, GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION, sw_caps); gst_caps_unref (sw_caps); } gst_caps_unref (peer_caps); } else { /* no peer, our padtemplate is enough then */ caps = gst_pad_get_pad_template_caps (pad); } if (filter) { GstCaps *intersection = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST); gst_caps_unref (caps); caps = intersection; } GST_DEBUG_OBJECT (render, "returning %" GST_PTR_FORMAT, caps); return caps; } static gboolean gst_dvbsub_overlay_can_handle_caps (GstCaps * incaps) { gboolean ret; GstCaps *caps; static GstStaticCaps static_caps = GST_STATIC_CAPS (DVBSUB_OVERLAY_CAPS); caps = gst_static_caps_get (&static_caps); ret = gst_caps_is_subset (incaps, caps); gst_caps_unref (caps); return ret; } /* only negotiate/query video overlay composition support for now */ static gboolean gst_dvbsub_overlay_negotiate (GstDVBSubOverlay * overlay, GstCaps * caps) { gboolean ret; gboolean attach = FALSE; gboolean caps_has_meta = TRUE; GstCapsFeatures *f; GST_DEBUG_OBJECT (overlay, "performing negotiation"); if (!caps) { caps = gst_pad_get_current_caps (overlay->srcpad); } else { gst_caps_ref (caps); } if (!caps || gst_caps_is_empty (caps)) goto no_format; /* Try to use the overlay meta if possible */ f = gst_caps_get_features (caps, 0); /* if the caps doesn't have the overlay meta, we query if downstream * accepts it before trying the version without the meta * If upstream already is using the meta then we can only use it */ if (!f || !gst_caps_features_contains (f, GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION)) { GstCaps *overlay_caps; GstCaps *peercaps; /* In this case we added the meta, but we can work without it * so preserve the original caps so we can use it as a fallback */ overlay_caps = gst_caps_copy (caps); f = gst_caps_get_features (overlay_caps, 0); gst_caps_features_add (f, GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION); /* FIXME: We should probably check if downstream *prefers* the * overlay meta, and only enforce usage of it if we can't handle * the format ourselves and thus would have to drop the overlays. * Otherwise we should prefer what downstream wants here. */ peercaps = gst_pad_peer_query_caps (overlay->srcpad, NULL); caps_has_meta = gst_caps_can_intersect (peercaps, overlay_caps); gst_caps_unref (peercaps); GST_DEBUG_OBJECT (overlay, "Downstream accepts the overlay meta: %d", caps_has_meta); if (caps_has_meta) { gst_caps_unref (caps); caps = overlay_caps; } else { /* fallback to the original */ gst_caps_unref (overlay_caps); caps_has_meta = FALSE; } } GST_DEBUG_OBJECT (overlay, "Using caps %" GST_PTR_FORMAT, caps); ret = gst_pad_set_caps (overlay->srcpad, caps); if (ret) { GstQuery *query; /* find supported meta */ query = gst_query_new_allocation (caps, FALSE); if (!gst_pad_peer_query (overlay->srcpad, query)) { /* no problem, we use the query defaults */ GST_DEBUG_OBJECT (overlay, "ALLOCATION query failed"); } if (caps_has_meta && gst_query_find_allocation_meta (query, GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE, NULL)) attach = TRUE; overlay->attach_compo_to_buffer = attach; gst_query_unref (query); } gst_caps_unref (caps); return ret; no_format: { if (caps) gst_caps_unref (caps); return FALSE; } } static gboolean gst_dvbsub_overlay_setcaps_video (GstPad * pad, GstCaps * caps) { GstDVBSubOverlay *render = GST_DVBSUB_OVERLAY (gst_pad_get_parent (pad)); gboolean ret = FALSE; GstVideoInfo info; if (!gst_video_info_from_caps (&info, caps)) goto invalid_caps; render->info = info; ret = gst_dvbsub_overlay_negotiate (render, caps); if (!render->attach_compo_to_buffer && !gst_dvbsub_overlay_can_handle_caps (caps)) goto unsupported_caps; GST_DEBUG_OBJECT (render, "dvbsub overlay renderer setup complete"); out: gst_object_unref (render); return ret; /* ERRORS */ invalid_caps: { GST_ERROR_OBJECT (render, "Can't parse caps: %" GST_PTR_FORMAT, caps); ret = FALSE; goto out; } unsupported_caps: { GST_ERROR_OBJECT (render, "Unsupported caps: %" GST_PTR_FORMAT, caps); ret = FALSE; goto out; } } static void gst_dvbsub_overlay_process_text (GstDVBSubOverlay * overlay, GstBuffer * buffer, guint64 pts) { GstMapInfo map; GST_DEBUG_OBJECT (overlay, "Processing subtitles with PTS=%" G_GUINT64_FORMAT " which is a time of %" GST_TIME_FORMAT, pts, GST_TIME_ARGS (pts)); gst_buffer_map (buffer, &map, GST_MAP_READ); GST_DEBUG_OBJECT (overlay, "Feeding %" G_GSIZE_FORMAT " bytes to libdvbsub", map.size); g_mutex_lock (&overlay->dvbsub_mutex); overlay->pending_sub = TRUE; dvb_sub_feed_with_pts (overlay->dvb_sub, pts, map.data, map.size); g_mutex_unlock (&overlay->dvbsub_mutex); gst_buffer_unmap (buffer, &map); gst_buffer_unref (buffer); if (overlay->pending_sub && overlay->force_end) { GST_DEBUG_OBJECT (overlay, "forcing subtitle end"); dvb_sub_feed_with_pts (overlay->dvb_sub, overlay->last_text_pts, NULL, 0); g_assert (overlay->pending_sub == FALSE); } } static void new_dvb_subtitles_cb (DvbSub * dvb_sub, DVBSubtitles * subs, gpointer user_data) { GstDVBSubOverlay *overlay = GST_DVBSUB_OVERLAY (user_data); int max_page_timeout; guint64 start, stop; max_page_timeout = g_atomic_int_get (&overlay->max_page_timeout); if (max_page_timeout > 0) subs->page_time_out = MIN (subs->page_time_out, max_page_timeout); GST_INFO_OBJECT (overlay, "New DVB subtitles arrived with a page_time_out of %d and %d regions for " "PTS=%" G_GUINT64_FORMAT ", which should be at time %" GST_TIME_FORMAT, subs->page_time_out, subs->num_rects, subs->pts, GST_TIME_ARGS (subs->pts)); /* spec says page_time_out is not to be taken very accurately anyway, * and 0 does not make useful sense anyway */ if (!subs->page_time_out) { GST_WARNING_OBJECT (overlay, "overriding page_time_out 0"); subs->page_time_out = 1; } /* clip and convert to running time */ start = subs->pts; stop = subs->pts + subs->page_time_out; if (!(gst_segment_clip (&overlay->subtitle_segment, GST_FORMAT_TIME, start, stop, &start, &stop))) goto out_of_segment; subs->page_time_out = stop - start; gst_segment_to_running_time (&overlay->subtitle_segment, GST_FORMAT_TIME, start); g_assert (GST_CLOCK_TIME_IS_VALID (start)); subs->pts = start; GST_DEBUG_OBJECT (overlay, "SUBTITLE real running time: %" GST_TIME_FORMAT, GST_TIME_ARGS (start)); g_queue_push_tail (overlay->pending_subtitles, subs); overlay->pending_sub = FALSE; return; out_of_segment: { GST_DEBUG_OBJECT (overlay, "subtitle out of segment, discarding"); dvb_subtitles_free (subs); } } static GstFlowReturn gst_dvbsub_overlay_chain_text (GstPad * pad, GstObject * parent, GstBuffer * buffer) { GstDVBSubOverlay *overlay = GST_DVBSUB_OVERLAY (parent); GST_INFO_OBJECT (overlay, "subpicture/x-dvb buffer with size %" G_GSIZE_FORMAT, gst_buffer_get_size (buffer)); GST_LOG_OBJECT (overlay, "Video segment: %" GST_SEGMENT_FORMAT " --- Subtitle segment: %" GST_SEGMENT_FORMAT " --- BUFFER: ts=%" GST_TIME_FORMAT, &overlay->video_segment, &overlay->subtitle_segment, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer))); /* DVB subtitle packets are required to carry the PTS */ if (G_UNLIKELY (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer))) { GST_WARNING_OBJECT (overlay, "Text buffer without valid timestamp, dropping"); gst_buffer_unref (buffer); return GST_FLOW_OK; } /* spec states multiple PES packets may have same PTS, * and same PTS packets make up a display set */ if (overlay->pending_sub && overlay->last_text_pts != GST_BUFFER_TIMESTAMP (buffer)) { GST_DEBUG_OBJECT (overlay, "finishing previous subtitle"); dvb_sub_feed_with_pts (overlay->dvb_sub, overlay->last_text_pts, NULL, 0); overlay->pending_sub = FALSE; } overlay->last_text_pts = GST_BUFFER_TIMESTAMP (buffer); /* As the passed start and stop is equal, we shouldn't need to care about out of segment at all, * the subtitle data for the PTS is completely out of interest to us. A given display set must * carry the same PTS value. */ /* FIXME: Consider with larger than 64kB display sets, which would be cut into multiple packets, * FIXME: does our waiting + render code work when there are more than one packets before * FIXME: rendering callback will get called? */ overlay->subtitle_segment.position = GST_BUFFER_TIMESTAMP (buffer); gst_dvbsub_overlay_process_text (overlay, buffer, GST_BUFFER_TIMESTAMP (buffer)); return GST_FLOW_OK; } static GstVideoOverlayComposition * gst_dvbsub_overlay_subs_to_comp (GstDVBSubOverlay * overlay, DVBSubtitles * subs) { GstVideoOverlayComposition *comp = NULL; GstVideoOverlayRectangle *rect; gint width, height, dw, dh, wx, wy; gint i; g_return_val_if_fail (subs != NULL && subs->num_rects > 0, NULL); width = GST_VIDEO_INFO_WIDTH (&overlay->info); height = GST_VIDEO_INFO_HEIGHT (&overlay->info); dw = subs->display_def.display_width; dh = subs->display_def.display_height; GST_LOG_OBJECT (overlay, "converting %d rectangles for display %dx%d -> video %dx%d", subs->num_rects, dw, dh, width, height); if (subs->display_def.window_flag) { wx = subs->display_def.window_x; wy = subs->display_def.window_y; GST_LOG_OBJECT (overlay, "display window %dx%d @ (%d, %d)", subs->display_def.window_width, subs->display_def.window_height, wx, wy); } else { wx = 0; wy = 0; } for (i = 0; i < subs->num_rects; i++) { DVBSubtitleRect *srect = &subs->rects[i]; GstBuffer *buf; gint w, h; guint8 *in_data; guint32 *palette, *data; gint rx, ry, rw, rh, stride; gint k, l; GstMapInfo map; GST_LOG_OBJECT (overlay, "rectangle %d: %dx%d @ (%d, %d)", i, srect->w, srect->h, srect->x, srect->y); w = srect->w; h = srect->h; buf = gst_buffer_new_and_alloc (w * h * 4); gst_buffer_map (buf, &map, GST_MAP_WRITE); data = (guint32 *) map.data; in_data = srect->pict.data; palette = srect->pict.palette; stride = srect->pict.rowstride; for (k = 0; k < h; k++) { for (l = 0; l < w; l++) { guint32 ayuv; ayuv = palette[*in_data]; GST_WRITE_UINT32_BE (data, ayuv); in_data++; data++; } in_data += stride - w; } gst_buffer_unmap (buf, &map); /* this is assuming the subtitle rectangle coordinates are relative * to the window (if there is one) within a display of specified dimension. * Coordinate wrt the latter is then scaled to the actual dimension of * the video we are dealing with here. */ rx = gst_util_uint64_scale (wx + srect->x, width, dw); ry = gst_util_uint64_scale (wy + srect->y, height, dh); rw = gst_util_uint64_scale (srect->w, width, dw); rh = gst_util_uint64_scale (srect->h, height, dh); GST_LOG_OBJECT (overlay, "rectangle %d rendered: %dx%d @ (%d, %d)", i, rw, rh, rx, ry); gst_buffer_add_video_meta (buf, GST_VIDEO_FRAME_FLAG_NONE, GST_VIDEO_OVERLAY_COMPOSITION_FORMAT_YUV, w, h); rect = gst_video_overlay_rectangle_new_raw (buf, rx, ry, rw, rh, 0); g_assert (rect); if (comp) { gst_video_overlay_composition_add_rectangle (comp, rect); } else { comp = gst_video_overlay_composition_new (rect); } gst_video_overlay_rectangle_unref (rect); gst_buffer_unref (buf); } return comp; } static GstFlowReturn gst_dvbsub_overlay_chain_video (GstPad * pad, GstObject * parent, GstBuffer * buffer) { GstDVBSubOverlay *overlay = GST_DVBSUB_OVERLAY (parent); GstFlowReturn ret = GST_FLOW_OK; gint64 start, stop; guint64 cstart, cstop; gboolean in_seg; GstClockTime vid_running_time, vid_running_time_end; if (GST_VIDEO_INFO_FORMAT (&overlay->info) == GST_VIDEO_FORMAT_UNKNOWN) return GST_FLOW_NOT_NEGOTIATED; if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) goto missing_timestamp; start = GST_BUFFER_TIMESTAMP (buffer); GST_LOG_OBJECT (overlay, "Video segment: %" GST_SEGMENT_FORMAT " --- Subtitle position: %" GST_TIME_FORMAT " --- BUFFER: ts=%" GST_TIME_FORMAT, &overlay->video_segment, GST_TIME_ARGS (overlay->subtitle_segment.position), GST_TIME_ARGS (start)); /* ignore buffers that are outside of the current segment */ if (!GST_BUFFER_DURATION_IS_VALID (buffer)) { stop = GST_CLOCK_TIME_NONE; } else { stop = start + GST_BUFFER_DURATION (buffer); } in_seg = gst_segment_clip (&overlay->video_segment, GST_FORMAT_TIME, start, stop, &cstart, &cstop); if (!in_seg) { GST_DEBUG_OBJECT (overlay, "Buffer outside configured segment -- dropping"); gst_buffer_unref (buffer); return GST_FLOW_OK; } buffer = gst_buffer_make_writable (buffer); GST_BUFFER_TIMESTAMP (buffer) = cstart; if (GST_BUFFER_DURATION_IS_VALID (buffer)) GST_BUFFER_DURATION (buffer) = cstop - cstart; vid_running_time = gst_segment_to_running_time (&overlay->video_segment, GST_FORMAT_TIME, cstart); if (GST_BUFFER_DURATION_IS_VALID (buffer)) vid_running_time_end = gst_segment_to_running_time (&overlay->video_segment, GST_FORMAT_TIME, cstop); else vid_running_time_end = vid_running_time; GST_DEBUG_OBJECT (overlay, "Video running time: %" GST_TIME_FORMAT, GST_TIME_ARGS (vid_running_time)); overlay->video_segment.position = GST_BUFFER_TIMESTAMP (buffer); g_mutex_lock (&overlay->dvbsub_mutex); if (!g_queue_is_empty (overlay->pending_subtitles)) { DVBSubtitles *tmp, *candidate = NULL; while (!g_queue_is_empty (overlay->pending_subtitles)) { tmp = g_queue_peek_head (overlay->pending_subtitles); if (tmp->pts > vid_running_time_end) { /* For a future video frame */ break; } else if (tmp->num_rects == 0) { /* Clear screen */ if (overlay->current_subtitle) dvb_subtitles_free (overlay->current_subtitle); overlay->current_subtitle = NULL; if (candidate) dvb_subtitles_free (candidate); candidate = NULL; g_queue_pop_head (overlay->pending_subtitles); dvb_subtitles_free (tmp); tmp = NULL; } else if (tmp->pts + tmp->page_time_out * GST_SECOND * ABS (overlay->subtitle_segment.rate) >= vid_running_time) { if (candidate) dvb_subtitles_free (candidate); candidate = tmp; g_queue_pop_head (overlay->pending_subtitles); } else { /* Too late */ dvb_subtitles_free (tmp); tmp = NULL; g_queue_pop_head (overlay->pending_subtitles); } } if (candidate) { GST_DEBUG_OBJECT (overlay, "Time to show the next subtitle page (%" GST_TIME_FORMAT " >= %" GST_TIME_FORMAT ") - it has %u regions", GST_TIME_ARGS (vid_running_time), GST_TIME_ARGS (candidate->pts), candidate->num_rects); dvb_subtitles_free (overlay->current_subtitle); overlay->current_subtitle = candidate; if (overlay->current_comp) gst_video_overlay_composition_unref (overlay->current_comp); overlay->current_comp = gst_dvbsub_overlay_subs_to_comp (overlay, overlay->current_subtitle); } } /* Check that we haven't hit the fallback timeout for current subtitle page */ if (overlay->current_subtitle && vid_running_time > (overlay->current_subtitle->pts + overlay->current_subtitle->page_time_out * GST_SECOND * ABS (overlay->subtitle_segment.rate))) { GST_INFO_OBJECT (overlay, "Subtitle page not redefined before fallback page_time_out of %u seconds (missed data?) - deleting current page", overlay->current_subtitle->page_time_out); dvb_subtitles_free (overlay->current_subtitle); overlay->current_subtitle = NULL; } /* Now render it */ if (g_atomic_int_get (&overlay->enable) && overlay->current_subtitle) { GstVideoFrame frame; g_assert (overlay->current_comp); if (overlay->attach_compo_to_buffer) { GST_DEBUG_OBJECT (overlay, "Attaching overlay image to video buffer"); gst_buffer_add_video_overlay_composition_meta (buffer, overlay->current_comp); } else { GST_DEBUG_OBJECT (overlay, "Blending overlay image to video buffer"); gst_video_frame_map (&frame, &overlay->info, buffer, GST_MAP_WRITE); gst_video_overlay_composition_blend (overlay->current_comp, &frame); gst_video_frame_unmap (&frame); } } g_mutex_unlock (&overlay->dvbsub_mutex); ret = gst_pad_push (overlay->srcpad, buffer); return ret; missing_timestamp: { GST_WARNING_OBJECT (overlay, "video buffer without timestamp, discarding"); gst_buffer_unref (buffer); return GST_FLOW_OK; } } static gboolean gst_dvbsub_overlay_query_video (GstPad * pad, GstObject * parent, GstQuery * query) { GstDVBSubOverlay *render = (GstDVBSubOverlay *) parent; gboolean ret; switch (GST_QUERY_TYPE (query)) { case GST_QUERY_CAPS: { GstCaps *filter, *caps; gst_query_parse_caps (query, &filter); caps = gst_dvbsub_overlay_get_videosink_caps (render, pad, filter); gst_query_set_caps_result (query, caps); gst_caps_unref (caps); ret = TRUE; break; } default: ret = gst_pad_query_default (pad, parent, query); break; } return ret; } static gboolean gst_dvbsub_overlay_event_video (GstPad * pad, GstObject * parent, GstEvent * event) { gboolean ret = FALSE; GstDVBSubOverlay *render = GST_DVBSUB_OVERLAY (parent); GST_DEBUG_OBJECT (pad, "received video event %s", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_CAPS: { GstCaps *caps; gst_event_parse_caps (event, &caps); ret = gst_dvbsub_overlay_setcaps_video (pad, caps); gst_event_unref (event); break; } case GST_EVENT_SEGMENT: { GstSegment seg; GST_DEBUG_OBJECT (render, "received new segment"); gst_event_copy_segment (event, &seg); if (seg.format == GST_FORMAT_TIME) { GST_DEBUG_OBJECT (render, "VIDEO SEGMENT now: %" GST_SEGMENT_FORMAT, &render->video_segment); render->video_segment = seg; GST_DEBUG_OBJECT (render, "VIDEO SEGMENT after: %" GST_SEGMENT_FORMAT, &render->video_segment); ret = gst_pad_push_event (render->srcpad, event); } else { GST_ELEMENT_WARNING (render, STREAM, MUX, (NULL), ("received non-TIME newsegment event on video input")); ret = FALSE; gst_event_unref (event); } break; } case GST_EVENT_FLUSH_STOP: gst_segment_init (&render->video_segment, GST_FORMAT_TIME); default: ret = gst_pad_push_event (render->srcpad, event); break; } return ret; } static gboolean gst_dvbsub_overlay_event_text (GstPad * pad, GstObject * parent, GstEvent * event) { gboolean ret = FALSE; GstDVBSubOverlay *render = GST_DVBSUB_OVERLAY (parent); GST_DEBUG_OBJECT (pad, "received text event %s", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_SEGMENT: { GstSegment seg; GST_DEBUG_OBJECT (render, "received new segment"); gst_event_copy_segment (event, &seg); if (seg.format == GST_FORMAT_TIME) { GST_DEBUG_OBJECT (render, "SUBTITLE SEGMENT now: %" GST_SEGMENT_FORMAT, &render->subtitle_segment); render->subtitle_segment = seg; GST_DEBUG_OBJECT (render, "SUBTITLE SEGMENT after: %" GST_SEGMENT_FORMAT, &render->subtitle_segment); ret = TRUE; gst_event_unref (event); } else { GST_ELEMENT_WARNING (render, STREAM, MUX, (NULL), ("received non-TIME newsegment event on subtitle sinkpad")); ret = FALSE; gst_event_unref (event); } break; } case GST_EVENT_FLUSH_STOP: GST_DEBUG_OBJECT (render, "stop flushing"); gst_dvbsub_overlay_flush_subtitles (render); gst_segment_init (&render->subtitle_segment, GST_FORMAT_TIME); gst_event_unref (event); ret = TRUE; break; case GST_EVENT_FLUSH_START: GST_DEBUG_OBJECT (render, "begin flushing"); gst_event_unref (event); ret = TRUE; break; case GST_EVENT_EOS: GST_INFO_OBJECT (render, "text EOS"); gst_event_unref (event); ret = TRUE; break; case GST_EVENT_GAP: gst_event_unref (event); ret = TRUE; break; case GST_EVENT_CAPS: /* don't want to forward the subtitle caps */ gst_event_unref (event); ret = TRUE; break; default: ret = gst_pad_push_event (render->srcpad, event); break; } return ret; } static gboolean plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_dvbsub_overlay_debug, "dvbsuboverlay", 0, "DVB subtitle overlay"); return gst_element_register (plugin, "dvbsuboverlay", GST_RANK_PRIMARY, GST_TYPE_DVBSUB_OVERLAY); } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, dvbsuboverlay, "DVB subtitle renderer", plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)