diff options
Diffstat (limited to 'gst/imagefreeze')
| -rw-r--r-- | gst/imagefreeze/Makefile.am | 24 | ||||
| -rw-r--r-- | gst/imagefreeze/Makefile.in | 819 | ||||
| -rw-r--r-- | gst/imagefreeze/gstimagefreeze.c | 927 | ||||
| -rw-r--r-- | gst/imagefreeze/gstimagefreeze.h | 74 |
4 files changed, 1844 insertions, 0 deletions
diff --git a/gst/imagefreeze/Makefile.am b/gst/imagefreeze/Makefile.am new file mode 100644 index 0000000..7aa8614 --- /dev/null +++ b/gst/imagefreeze/Makefile.am @@ -0,0 +1,24 @@ +plugin_LTLIBRARIES = libgstimagefreeze.la + +libgstimagefreeze_la_SOURCES = gstimagefreeze.c + +libgstimagefreeze_la_CFLAGS = $(GST_CFLAGS) +libgstimagefreeze_la_LIBADD = $(GST_LIBS) +libgstimagefreeze_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS) +libgstimagefreeze_la_LIBTOOLFLAGS = --tag=disable-static + +noinst_HEADERS = gstimagefreeze.h + +Android.mk: Makefile.am $(BUILT_SOURCES) + androgenizer \ + -:PROJECT libgstimagefreeze -:SHARED libgstimagefreeze \ + -:TAGS eng debug \ + -:REL_TOP $(top_srcdir) -:ABS_TOP $(abs_top_srcdir) \ + -:SOURCES $(libgstimagefreeze_la_SOURCES) \ + -:CFLAGS $(DEFS) $(DEFAULT_INCLUDES) $(libgstimagefreeze_la_CFLAGS) \ + -:LDFLAGS $(libgstimagefreeze_la_LDFLAGS) \ + $(libgstimagefreeze_la_LIBADD) \ + -ldl \ + -:PASSTHROUGH LOCAL_ARM_MODE:=arm \ + LOCAL_MODULE_PATH:='$$(TARGET_OUT)/lib/gstreamer-0.10' \ + > $@ diff --git a/gst/imagefreeze/Makefile.in b/gst/imagefreeze/Makefile.in new file mode 100644 index 0000000..4c8a06d --- /dev/null +++ b/gst/imagefreeze/Makefile.in @@ -0,0 +1,819 @@ +# Makefile.in generated by automake 1.11.3 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software +# Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkgincludedir 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+.NOEXPORT: diff --git a/gst/imagefreeze/gstimagefreeze.c b/gst/imagefreeze/gstimagefreeze.c new file mode 100644 index 0000000..f5f05dd --- /dev/null +++ b/gst/imagefreeze/gstimagefreeze.c @@ -0,0 +1,927 @@ +/* GStreamer + * Copyright (c) 2005 Edward Hervey <bilboed@bilboed.com> + * Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk> + * + * 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. + * + * <refsect2> + * <title>Example launch line</title> + * |[ + * gst-launch -v filesrc location=some.png ! decodebin2 ! imagefreeze ! autovideosink + * ]| This pipeline shows a still frame stream of a PNG file. + * </refsect2> + */ + +/* 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 + +/* FIXME 0.11: suppress warnings for deprecated API such as GStaticRecMutex + * with newer GLib versions (>= 2.31.0) */ +#define GLIB_DISABLE_DEPRECATION_WARNINGS + +#include <gst/glib-compat-private.h> + +#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 <sebastian.droege@collabora.co.uk>"); + + gst_element_class_add_static_pad_template (gstelement_class, + &sink_pad_template); + gst_element_class_add_static_pad_template (gstelement_class, + &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_UNEXPECTED; + } + + 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; + } + 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; + } + 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; + break; + } + case GST_FORMAT_TIME:{ + g_mutex_lock (self->lock); + position = self->segment.last_stop; + g_mutex_unlock (self->lock); + ret = TRUE; + break; + } + 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; + break; + } + 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; + break; + } + 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_UNEXPECTED; + } + + 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) diff --git a/gst/imagefreeze/gstimagefreeze.h b/gst/imagefreeze/gstimagefreeze.h new file mode 100644 index 0000000..d5b1449 --- /dev/null +++ b/gst/imagefreeze/gstimagefreeze.h @@ -0,0 +1,74 @@ +/* GStreamer + * Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk> + * + * 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. + */ + +#ifndef __GST_IMAGE_FREEZE_H__ +#define __GST_IMAGE_FREEZE_H__ + +#include <gst/gst.h> + +G_BEGIN_DECLS + +#define GST_TYPE_IMAGE_FREEZE \ + (gst_image_freeze_get_type()) +#define GST_IMAGE_FREEZE(obj) \ + (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_IMAGE_FREEZE,GstImageFreeze)) +#define GST_IMAGE_FREEZE_CLASS(klass) \ + (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_IMAGE_FREEZE,GstImageFreezeClass)) +#define GST_IMAGE_FREEZE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj),GST_TYPE_IMAGE_FREEZE,GstImageFreezeClass)) +#define GST_IS_IMAGE_FREEZE(obj) \ + (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_IMAGE_FREEZE)) +#define GST_IS_IMAGE_FREEZE_CLASS(klass) \ + (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_IMAGE_FREEZE)) + +typedef struct _GstImageFreeze GstImageFreeze; +typedef struct _GstImageFreezeClass GstImageFreezeClass; + +struct _GstImageFreeze +{ + GstElement parent; + + /* < private > */ + GstPad *sinkpad; + GstPad *srcpad; + + GMutex *lock; + GstBuffer *buffer; + gint fps_n, fps_d; + + GstSegment segment; + gboolean need_segment; + GstEvent *close_segment; + + guint64 offset; + + /* TRUE if currently doing a flushing seek, protected + * by srcpad's stream lock */ + gint seeking; +}; + +struct _GstImageFreezeClass +{ + GstElementClass parent_class; +}; + +GType gst_image_freeze_get_type (void); + +G_END_DECLS + +#endif /* __GST_IMAGE_FREEZE_H__ */ |