/* GStreamer * Copyright (c) 2005 Edward Hervey * Copyright (C) 2010 Sebastian Dröge * * 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-imagefreeze * * The imagefreeze element generates a still frame video stream from * the input. It duplicates the first frame with the framerate requested * by downstream, allows seeking and answers queries. * * * Example launch line * |[ * gst-launch -v filesrc location=some.png ! decodebin2 ! imagefreeze ! autovideosink * ]| This pipeline shows a still frame stream of a PNG file. * */ /* This is based on the imagefreeze element from PiTiVi: * http://git.gnome.org/browse/pitivi/tree/pitivi/elements/imagefreeze.py */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "gstimagefreeze.h" static void gst_image_freeze_finalize (GObject * object); static void gst_image_freeze_reset (GstImageFreeze * self); static GstStateChangeReturn gst_image_freeze_change_state (GstElement * element, GstStateChange transition); static GstFlowReturn gst_image_freeze_sink_chain (GstPad * pad, GstBuffer * buffer); static gboolean gst_image_freeze_sink_event (GstPad * pad, GstEvent * event); static gboolean gst_image_freeze_sink_setcaps (GstPad * pad, GstCaps * caps); static GstCaps *gst_image_freeze_sink_getcaps (GstPad * pad); static gboolean gst_image_freeze_sink_query (GstPad * pad, GstQuery * query); static GstFlowReturn gst_image_freeze_sink_bufferalloc (GstPad * pad, guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf); static void gst_image_freeze_src_loop (GstPad * pad); static gboolean gst_image_freeze_src_event (GstPad * pad, GstEvent * event); static gboolean gst_image_freeze_src_query (GstPad * pad, GstQuery * query); static const GstQueryType *gst_image_freeze_src_query_type (GstPad * pad); static GstStaticPadTemplate sink_pad_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb; video/x-raw-gray")); static GstStaticPadTemplate src_pad_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-raw-yuv; video/x-raw-rgb; video/x-raw-gray")); GST_DEBUG_CATEGORY_STATIC (gst_image_freeze_debug); #define GST_CAT_DEFAULT gst_image_freeze_debug GST_BOILERPLATE (GstImageFreeze, gst_image_freeze, GstElement, GST_TYPE_ELEMENT); static void gst_image_freeze_base_init (gpointer g_class) { GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details_simple (gstelement_class, "Still frame stream generator", "Filter/Video", "Generates a still frame stream from an image", "Sebastian Dröge "); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&sink_pad_template)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&src_pad_template)); } static void gst_image_freeze_class_init (GstImageFreezeClass * klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); gobject_class->finalize = gst_image_freeze_finalize; gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_image_freeze_change_state); } static void gst_image_freeze_init (GstImageFreeze * self, GstImageFreezeClass * g_class) { self->sinkpad = gst_pad_new_from_static_template (&sink_pad_template, "sink"); gst_pad_set_chain_function (self->sinkpad, GST_DEBUG_FUNCPTR (gst_image_freeze_sink_chain)); gst_pad_set_event_function (self->sinkpad, GST_DEBUG_FUNCPTR (gst_image_freeze_sink_event)); gst_pad_set_query_function (self->sinkpad, GST_DEBUG_FUNCPTR (gst_image_freeze_sink_query)); gst_pad_set_setcaps_function (self->sinkpad, GST_DEBUG_FUNCPTR (gst_image_freeze_sink_setcaps)); gst_pad_set_getcaps_function (self->sinkpad, GST_DEBUG_FUNCPTR (gst_image_freeze_sink_getcaps)); gst_pad_set_bufferalloc_function (self->sinkpad, GST_DEBUG_FUNCPTR (gst_image_freeze_sink_bufferalloc)); gst_element_add_pad (GST_ELEMENT (self), self->sinkpad); self->srcpad = gst_pad_new_from_static_template (&src_pad_template, "src"); gst_pad_set_event_function (self->srcpad, GST_DEBUG_FUNCPTR (gst_image_freeze_src_event)); gst_pad_set_query_function (self->srcpad, GST_DEBUG_FUNCPTR (gst_image_freeze_src_query)); gst_pad_set_query_type_function (self->srcpad, GST_DEBUG_FUNCPTR (gst_image_freeze_src_query_type)); gst_pad_use_fixed_caps (self->srcpad); gst_element_add_pad (GST_ELEMENT (self), self->srcpad); self->lock = g_mutex_new (); gst_image_freeze_reset (self); } static void gst_image_freeze_finalize (GObject * object) { GstImageFreeze *self = GST_IMAGE_FREEZE (object); gst_image_freeze_reset (self); if (self->lock) g_mutex_free (self->lock); self->lock = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_image_freeze_reset (GstImageFreeze * self) { GST_DEBUG_OBJECT (self, "Resetting internal state"); g_mutex_lock (self->lock); gst_buffer_replace (&self->buffer, NULL); gst_segment_init (&self->segment, GST_FORMAT_TIME); self->need_segment = TRUE; gst_event_replace (&self->close_segment, NULL); self->fps_n = self->fps_d = 0; self->offset = 0; g_mutex_unlock (self->lock); g_atomic_int_set (&self->seeking, 0); } static gboolean gst_image_freeze_sink_setcaps (GstPad * pad, GstCaps * caps) { GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad)); gboolean ret = FALSE; GstStructure *s; gint fps_n, fps_d; GstCaps *othercaps, *intersection; guint i, n; caps = gst_caps_make_writable (gst_caps_ref (caps)); GST_DEBUG_OBJECT (pad, "Setting caps: %" GST_PTR_FORMAT, caps); s = gst_caps_get_structure (caps, 0); /* 1. Remove framerate */ gst_structure_remove_field (s, "framerate"); gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1, NULL); /* 2. Intersect with template caps */ othercaps = (GstCaps *) gst_pad_get_pad_template_caps (pad); intersection = gst_caps_intersect (caps, othercaps); GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps); GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps); GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection); gst_caps_unref (caps); caps = intersection; intersection = othercaps = NULL; /* 3. Intersect with downstream peer caps */ othercaps = gst_pad_peer_get_caps (self->srcpad); if (othercaps) { intersection = gst_caps_intersect (caps, othercaps); GST_DEBUG_OBJECT (pad, "Intersecting: %" GST_PTR_FORMAT, caps); GST_DEBUG_OBJECT (pad, "with: %" GST_PTR_FORMAT, othercaps); GST_DEBUG_OBJECT (pad, "gave: %" GST_PTR_FORMAT, intersection); gst_caps_unref (othercaps); gst_caps_unref (caps); caps = intersection; intersection = othercaps = NULL; } /* 4. For every candidate check if it's accepted downstream * and fixate framerate to nearest 25/1 */ n = gst_caps_get_size (caps); for (i = 0; i < n; i++) { GstCaps *candidate = gst_caps_new_empty (); GstStructure *s = gst_structure_copy (gst_caps_get_structure (caps, i)); gst_caps_append_structure (candidate, s); if (gst_pad_peer_accept_caps (self->srcpad, candidate)) { if (gst_structure_has_field_typed (s, "framerate", GST_TYPE_FRACTION) || gst_structure_fixate_field_nearest_fraction (s, "framerate", 25, 1)) { gst_structure_get_fraction (s, "framerate", &fps_n, &fps_d); if (fps_d != 0) { g_mutex_lock (self->lock); self->fps_n = fps_n; self->fps_d = fps_d; g_mutex_unlock (self->lock); GST_DEBUG_OBJECT (pad, "Setting caps %" GST_PTR_FORMAT, candidate); gst_pad_set_caps (self->srcpad, candidate); gst_caps_unref (candidate); ret = TRUE; goto done; } else { GST_WARNING_OBJECT (pad, "Invalid caps with framerate %d/%d", fps_n, fps_d); } } } gst_caps_unref (candidate); } done: if (!ret) GST_ERROR_OBJECT (pad, "No usable caps found"); gst_caps_unref (caps); gst_object_unref (self); return ret; } static GstCaps * gst_image_freeze_sink_getcaps (GstPad * pad) { GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad)); GstCaps *ret, *tmp; guint i, n; if (GST_PAD_CAPS (pad)) { ret = gst_caps_copy (GST_PAD_CAPS (pad)); goto done; } tmp = gst_pad_peer_get_caps (self->srcpad); if (tmp) { ret = gst_caps_intersect (tmp, gst_pad_get_pad_template_caps (pad)); gst_caps_unref (tmp); } else { ret = gst_caps_copy (gst_pad_get_pad_template_caps (pad)); } n = gst_caps_get_size (ret); for (i = 0; i < n; i++) { GstStructure *s = gst_caps_get_structure (ret, i); gst_structure_remove_field (s, "framerate"); gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, G_MAXINT, 1, NULL); } done: gst_object_unref (self); GST_LOG_OBJECT (pad, "Returning caps: %" GST_PTR_FORMAT, ret); return ret; } static gboolean gst_image_freeze_sink_query (GstPad * pad, GstQuery * query) { GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad)); gboolean ret; GstPad *peer = gst_pad_get_peer (self->srcpad); GST_LOG_OBJECT (pad, "Handling query of type '%s'", gst_query_type_get_name (GST_QUERY_TYPE (query))); if (!peer) { GST_INFO_OBJECT (pad, "No peer yet, dropping query"); ret = FALSE; } else { ret = gst_pad_query (peer, query); gst_object_unref (peer); } gst_object_unref (self); return ret; } static GstFlowReturn gst_image_freeze_sink_bufferalloc (GstPad * pad, guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf) { GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad)); GstFlowReturn ret; gboolean do_alloc; GST_LOG_OBJECT (pad, "Allocating buffer with offset 0x%" G_GINT64_MODIFIER "x and size %u with caps: %" GST_PTR_FORMAT, offset, size, caps); *buf = NULL; g_mutex_lock (self->lock); do_alloc = self->buffer == NULL; g_mutex_unlock (self->lock); if (do_alloc) { gboolean seeking = FALSE; do { GST_PAD_STREAM_LOCK (self->srcpad); ret = gst_pad_alloc_buffer (self->srcpad, offset, size, caps, buf); seeking = ret == GST_FLOW_WRONG_STATE && g_atomic_int_get (&self->seeking); GST_PAD_STREAM_UNLOCK (self->srcpad); } while (seeking); if (G_UNLIKELY (ret != GST_FLOW_OK)) GST_ERROR_OBJECT (pad, "Allocating buffer failed: %s", gst_flow_get_name (ret)); } else { /* Let upstream go EOS if we already have a buffer */ ret = GST_FLOW_EOS; } gst_object_unref (self); return ret; } static gboolean gst_image_freeze_convert (GstImageFreeze * self, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value) { gboolean ret = FALSE; if (src_format == *dest_format) { *dest_value = src_value; return TRUE; } if (src_value == -1) { *dest_value = -1; return TRUE; } switch (src_format) { case GST_FORMAT_DEFAULT:{ switch (*dest_format) { case GST_FORMAT_TIME: g_mutex_lock (self->lock); if (self->fps_n == 0) *dest_value = -1; else *dest_value = gst_util_uint64_scale (src_value, GST_SECOND * self->fps_d, self->fps_n); g_mutex_unlock (self->lock); ret = TRUE; break; default: break; } } case GST_FORMAT_TIME:{ switch (*dest_format) { case GST_FORMAT_DEFAULT: g_mutex_lock (self->lock); *dest_value = gst_util_uint64_scale (src_value, self->fps_n, self->fps_d * GST_SECOND); g_mutex_unlock (self->lock); ret = TRUE; break; default: break; } } default: break; } return ret; } static const GstQueryType * gst_image_freeze_src_query_type (GstPad * pad) { static const GstQueryType types[] = { GST_QUERY_POSITION, GST_QUERY_DURATION, GST_QUERY_SEEKING, GST_QUERY_CONVERT, 0 }; return types; } static gboolean gst_image_freeze_src_query (GstPad * pad, GstQuery * query) { GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad)); gboolean ret = FALSE; GST_LOG_OBJECT (pad, "Handling query of type '%s'", gst_query_type_get_name (GST_QUERY_TYPE (query))); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_CONVERT:{ GstFormat src_format, dest_format; gint64 src_value, dest_value; gst_query_parse_convert (query, &src_format, &src_value, &dest_format, &dest_value); ret = gst_image_freeze_convert (self, src_format, src_value, &dest_format, &dest_value); if (ret) gst_query_set_convert (query, src_format, src_value, dest_format, dest_value); break; } case GST_QUERY_POSITION:{ GstFormat format; gint64 position; gst_query_parse_position (query, &format, NULL); switch (format) { case GST_FORMAT_DEFAULT:{ g_mutex_lock (self->lock); position = self->offset; g_mutex_unlock (self->lock); ret = TRUE; } case GST_FORMAT_TIME:{ g_mutex_lock (self->lock); position = self->segment.last_stop; g_mutex_unlock (self->lock); ret = TRUE; } default: break; } if (ret) { gst_query_set_position (query, format, position); GST_DEBUG_OBJECT (pad, "Returning position %" G_GINT64_FORMAT " in format %s", position, gst_format_get_name (format)); } else { GST_DEBUG_OBJECT (pad, "Position query failed"); } break; } case GST_QUERY_DURATION:{ GstFormat format; gint64 duration; gst_query_parse_duration (query, &format, NULL); switch (format) { case GST_FORMAT_TIME:{ g_mutex_lock (self->lock); duration = self->segment.stop; g_mutex_unlock (self->lock); ret = TRUE; } case GST_FORMAT_DEFAULT:{ g_mutex_lock (self->lock); duration = self->segment.stop; if (duration != -1) duration = gst_util_uint64_scale (duration, self->fps_n, GST_SECOND * self->fps_d); g_mutex_unlock (self->lock); ret = TRUE; } default: break; } if (ret) { gst_query_set_duration (query, format, duration); GST_DEBUG_OBJECT (pad, "Returning duration %" G_GINT64_FORMAT " in format %s", duration, gst_format_get_name (format)); } else { GST_DEBUG_OBJECT (pad, "Duration query failed"); } break; } case GST_QUERY_SEEKING:{ GstFormat format; gboolean seekable; gst_query_parse_seeking (query, &format, NULL, NULL, NULL); seekable = (format == GST_FORMAT_TIME || format == GST_FORMAT_DEFAULT); gst_query_set_seeking (query, format, seekable, (seekable ? 0 : -1), -1); ret = TRUE; break; } default: ret = FALSE; break; } gst_object_unref (self); return ret; } static gboolean gst_image_freeze_sink_event (GstPad * pad, GstEvent * event) { GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad)); gboolean ret; GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_EOS: if (!self->buffer) { /* if we receive EOS before a buffer arrives, then let it pass */ GST_DEBUG_OBJECT (self, "EOS without input buffer, passing on"); ret = gst_pad_push_event (self->srcpad, event); break; } /* fall-through */ case GST_EVENT_NEWSEGMENT: GST_DEBUG_OBJECT (pad, "Dropping event"); gst_event_unref (event); ret = TRUE; break; case GST_EVENT_FLUSH_START: gst_image_freeze_reset (self); /* fall through */ default: ret = gst_pad_push_event (self->srcpad, event); break; } gst_object_unref (self); return ret; } static gboolean gst_image_freeze_src_event (GstPad * pad, GstEvent * event) { GstImageFreeze *self = GST_IMAGE_FREEZE (gst_pad_get_parent (pad)); gboolean ret; GST_LOG_OBJECT (pad, "Got %s event", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_NAVIGATION: case GST_EVENT_QOS: case GST_EVENT_LATENCY: case GST_EVENT_STEP: GST_DEBUG_OBJECT (pad, "Dropping event"); gst_event_unref (event); ret = TRUE; break; case GST_EVENT_SEEK:{ gdouble rate; GstFormat format; GstSeekFlags flags; GstSeekType start_type, stop_type; gint64 start, stop; gint64 last_stop; gboolean start_task; gboolean flush; gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start, &stop_type, &stop); gst_event_unref (event); flush = ! !(flags & GST_SEEK_FLAG_FLUSH); if (format != GST_FORMAT_TIME && format != GST_FORMAT_DEFAULT) { GST_ERROR_OBJECT (pad, "Seek in invalid format: %s", gst_format_get_name (format)); ret = FALSE; break; } if (format == GST_FORMAT_DEFAULT) { format = GST_FORMAT_TIME; if (!gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, start, &format, &start) || !gst_image_freeze_convert (self, GST_FORMAT_DEFAULT, stop, &format, &stop) || start == -1 || stop == -1) { GST_ERROR_OBJECT (pad, "Failed to convert seek from DEFAULT format into TIME format"); ret = FALSE; break; } } if (flush) { GstEvent *e; g_atomic_int_set (&self->seeking, 1); e = gst_event_new_flush_start (); gst_pad_push_event (self->srcpad, e); } else { gst_pad_pause_task (self->srcpad); } GST_PAD_STREAM_LOCK (self->srcpad); g_mutex_lock (self->lock); gst_event_replace (&self->close_segment, NULL); if (!flush) { if (!self->need_segment && self->segment.rate >= 0) { self->close_segment = gst_event_new_new_segment_full (TRUE, self->segment.rate, self->segment.applied_rate, self->segment.format, self->segment.start, self->segment.last_stop, self->segment.time); } else if (!self->need_segment) { gint64 stop; if ((stop = self->segment.stop) == -1) stop = self->segment.duration; self->close_segment = gst_event_new_new_segment_full (TRUE, self->segment.rate, self->segment.applied_rate, self->segment.format, self->segment.last_stop, stop, self->segment.last_stop); } } gst_segment_set_seek (&self->segment, rate, format, flags, start_type, start, stop_type, stop, NULL); self->need_segment = TRUE; last_stop = self->segment.last_stop; start_task = self->buffer != NULL; g_mutex_unlock (self->lock); if (flush) { GstEvent *e; e = gst_event_new_flush_stop (); gst_pad_push_event (self->srcpad, e); g_atomic_int_set (&self->seeking, 0); } if (flags & GST_SEEK_FLAG_SEGMENT) { GstMessage *m; m = gst_message_new_segment_start (GST_OBJECT (self), format, last_stop); gst_element_post_message (GST_ELEMENT (self), m); } GST_PAD_STREAM_UNLOCK (self->srcpad); GST_DEBUG_OBJECT (pad, "Seek successful"); if (start_task) { g_mutex_lock (self->lock); if (self->buffer != NULL) gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop, self->srcpad); g_mutex_unlock (self->lock); } ret = TRUE; break; } case GST_EVENT_FLUSH_START: gst_image_freeze_reset (self); /* fall through */ default: ret = gst_pad_push_event (self->sinkpad, event); break; } gst_object_unref (self); return ret; } static GstFlowReturn gst_image_freeze_sink_chain (GstPad * pad, GstBuffer * buffer) { GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad)); g_mutex_lock (self->lock); if (self->buffer) { GST_DEBUG_OBJECT (pad, "Already have a buffer, dropping"); gst_buffer_unref (buffer); g_mutex_unlock (self->lock); return GST_FLOW_EOS; } self->buffer = buffer; gst_pad_start_task (self->srcpad, (GstTaskFunction) gst_image_freeze_src_loop, self->srcpad); g_mutex_unlock (self->lock); return GST_FLOW_OK; } static void gst_image_freeze_src_loop (GstPad * pad) { GstImageFreeze *self = GST_IMAGE_FREEZE (GST_PAD_PARENT (pad)); GstBuffer *buffer; guint64 offset; GstClockTime timestamp, timestamp_end; gint64 cstart, cstop; gboolean in_seg, eos; g_mutex_lock (self->lock); if (!self->buffer) { GST_ERROR_OBJECT (pad, "Have no buffer yet"); g_mutex_unlock (self->lock); gst_pad_pause_task (self->srcpad); return; } buffer = gst_buffer_ref (self->buffer); buffer = gst_buffer_make_metadata_writable (buffer); g_mutex_unlock (self->lock); if (self->close_segment) { GST_DEBUG_OBJECT (pad, "Closing previous segment"); gst_pad_push_event (self->srcpad, self->close_segment); self->close_segment = NULL; } if (self->need_segment) { GstEvent *e; GST_DEBUG_OBJECT (pad, "Pushing NEWSEGMENT event: %" GST_SEGMENT_FORMAT, &self->segment); e = gst_event_new_new_segment_full (FALSE, self->segment.rate, self->segment.applied_rate, self->segment.format, self->segment.start, self->segment.stop, self->segment.start); g_mutex_lock (self->lock); if (self->segment.rate >= 0) { self->offset = gst_util_uint64_scale (self->segment.start, self->fps_n, self->fps_d * GST_SECOND); } else { self->offset = gst_util_uint64_scale (self->segment.stop, self->fps_n, self->fps_d * GST_SECOND); } g_mutex_unlock (self->lock); self->need_segment = FALSE; gst_pad_push_event (self->srcpad, e); } g_mutex_lock (self->lock); offset = self->offset; if (self->fps_n != 0) { timestamp = gst_util_uint64_scale (offset, self->fps_d * GST_SECOND, self->fps_n); timestamp_end = gst_util_uint64_scale (offset + 1, self->fps_d * GST_SECOND, self->fps_n); } else { timestamp = self->segment.start; timestamp_end = GST_CLOCK_TIME_NONE; } eos = (self->fps_n == 0 && offset > 0) || (self->segment.rate >= 0 && self->segment.stop != -1 && timestamp > self->segment.stop) || (self->segment.rate < 0 && offset == 0) || (self->segment.rate < 0 && self->segment.start != -1 && timestamp_end < self->segment.start); if (self->fps_n == 0 && offset > 0) in_seg = FALSE; else in_seg = gst_segment_clip (&self->segment, GST_FORMAT_TIME, timestamp, timestamp_end, &cstart, &cstop); if (in_seg) gst_segment_set_last_stop (&self->segment, GST_FORMAT_TIME, cstart); if (self->segment.rate >= 0) self->offset++; else self->offset--; g_mutex_unlock (self->lock); GST_DEBUG_OBJECT (pad, "Handling buffer with timestamp %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp)); if (in_seg) { GstFlowReturn ret; GST_BUFFER_TIMESTAMP (buffer) = cstart; GST_BUFFER_DURATION (buffer) = cstop - cstart; GST_BUFFER_OFFSET (buffer) = offset; GST_BUFFER_OFFSET_END (buffer) = offset + 1; gst_buffer_set_caps (buffer, GST_PAD_CAPS (self->srcpad)); ret = gst_pad_push (self->srcpad, buffer); GST_DEBUG_OBJECT (pad, "Pushing buffer resulted in %s", gst_flow_get_name (ret)); if (ret != GST_FLOW_OK) gst_pad_pause_task (self->srcpad); } else { gst_buffer_unref (buffer); } if (eos) { if ((self->segment.flags & GST_SEEK_FLAG_SEGMENT)) { GstMessage *m; GST_DEBUG_OBJECT (pad, "Sending segment done at end of segment"); if (self->segment.rate >= 0) m = gst_message_new_segment_done (GST_OBJECT_CAST (self), GST_FORMAT_TIME, self->segment.stop); else m = gst_message_new_segment_done (GST_OBJECT_CAST (self), GST_FORMAT_TIME, self->segment.start); gst_element_post_message (GST_ELEMENT_CAST (self), m); } else { GST_DEBUG_OBJECT (pad, "Sending EOS at end of segment"); gst_pad_push_event (self->srcpad, gst_event_new_eos ()); } gst_pad_pause_task (self->srcpad); } } static GstStateChangeReturn gst_image_freeze_change_state (GstElement * element, GstStateChange transition) { GstImageFreeze *self = GST_IMAGE_FREEZE (element); GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: gst_image_freeze_reset (self); break; case GST_STATE_CHANGE_PAUSED_TO_READY: gst_pad_stop_task (self->srcpad); gst_image_freeze_reset (self); break; default: break; } if (GST_ELEMENT_CLASS (parent_class)->change_state) ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { default: break; } return ret; } static gboolean plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_image_freeze_debug, "imagefreeze", 0, "imagefreeze element"); if (!gst_element_register (plugin, "imagefreeze", GST_RANK_NONE, GST_TYPE_IMAGE_FREEZE)) return FALSE; return TRUE; } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, "imagefreeze", "Still frame stream generator", plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)