/* * GStreamer * Copyright (C) 2010 Texas Instruments, Inc * * 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-basecamerasrc * * Base class for the camera source bin used by camerabin for capture. * Sophisticated camera hardware can derive from this baseclass and map the * features to this interface. * * The design mandates that the subclasses implement the following features and * behaviour: * * * 3 pads: viewfinder, image capture, video capture * * * * * * During construct_pipeline() vmethod a subclass can add several elements into * the bin and expose 3 srcs pads as ghostpads implementing the 3 pad templates. * * However the subclass is responsable for adding the pad templates for the * source pads and they must be named "vidsrc", "imgsrc" and "vfsrc". The pad * templates should be installed in the subclass' class_init function, like so: * |[ * static void * my_element_class_init (GstMyElementClass *klass) * { * GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass); * // pad templates should be a #GstStaticPadTemplate with direction * // #GST_PAD_SRC and name "vidsrc", "imgsrc" and "vfsrc" * gst_element_class_add_static_pad_template (gstelement_class, * &vidsrc_template); * gst_element_class_add_static_pad_template (gstelement_class, * &imgsrc_template); * gst_element_class_add_static_pad_template (gstelement_class, * &vfsrc_template); * // see #GstElementDetails * gst_element_class_set_details (gstelement_class, &details); * } * ]| * * It is also possible to add regular pads from the subclass and implement the * dataflow methods on these pads. This way all functionality can be implemneted * directly in the subclass without extra elements. * * The src will receive the capture mode from #GstCameraBin2 on the * #GstBaseCameraSrc:mode property. Possible capture modes are defined in * #GstCameraBinMode. */ #ifdef HAVE_CONFIG_H # include #endif #include #include "gstbasecamerasrc.h" enum { PROP_0, PROP_MODE, PROP_ZOOM, PROP_MAX_ZOOM, PROP_READY_FOR_CAPTURE, PROP_POST_PREVIEW, PROP_PREVIEW_CAPS, PROP_PREVIEW_FILTER }; enum { /* action signals */ START_CAPTURE_SIGNAL, STOP_CAPTURE_SIGNAL, /* emit signals */ LAST_SIGNAL }; #define DEFAULT_POST_PREVIEW TRUE static guint basecamerasrc_signals[LAST_SIGNAL]; GST_DEBUG_CATEGORY (base_camera_src_debug); #define GST_CAT_DEFAULT base_camera_src_debug #define parent_class gst_base_camera_src_parent_class G_DEFINE_TYPE (GstBaseCameraSrc, gst_base_camera_src, GST_TYPE_BIN); /* NOTE: we could provide a vmethod for derived class to overload to provide * it's own implementation of interface.. but in all cases I can think of at * moment, either the camerasrc itself, or some element within the bin, will * be implementing the interface.. */ /** * gst_base_camera_src_set_mode: * @self: the camerasrc bin * @mode: the mode * * Set the chosen #GstCameraBinMode capture mode. */ gboolean gst_base_camera_src_set_mode (GstBaseCameraSrc * self, GstCameraBinMode mode) { GstBaseCameraSrcClass *bclass = GST_BASE_CAMERA_SRC_GET_CLASS (self); g_return_val_if_fail (bclass->set_mode, FALSE); if (bclass->set_mode (self, mode)) { self->mode = mode; return TRUE; } return FALSE; } /** * gst_base_camera_src_setup_zoom: * @self: camerasrc object * * Apply zoom configured to camerabin to capture. */ void gst_base_camera_src_setup_zoom (GstBaseCameraSrc * self) { GstBaseCameraSrcClass *bclass = GST_BASE_CAMERA_SRC_GET_CLASS (self); g_return_if_fail (self->zoom); g_return_if_fail (bclass->set_zoom); bclass->set_zoom (self, self->zoom); } /** * gst_base_camera_src_setup_preview: * @self: camerasrc bin * @preview_caps: preview caps to set * * Apply preview caps to preview pipeline and to video source. */ void gst_base_camera_src_setup_preview (GstBaseCameraSrc * self, GstCaps * preview_caps) { GstBaseCameraSrcClass *bclass = GST_BASE_CAMERA_SRC_GET_CLASS (self); if (self->preview_pipeline) { GST_DEBUG_OBJECT (self, "Setting preview pipeline caps %" GST_PTR_FORMAT, self->preview_caps); gst_camerabin_preview_set_caps (self->preview_pipeline, preview_caps); } if (bclass->set_preview) bclass->set_preview (self, preview_caps); } static void gst_base_camera_src_start_capture (GstBaseCameraSrc * src) { GstBaseCameraSrcClass *klass = GST_BASE_CAMERA_SRC_GET_CLASS (src); g_return_if_fail (klass->start_capture != NULL); GST_DEBUG_OBJECT (src, "Starting capture"); g_mutex_lock (&src->capturing_mutex); if (src->capturing) { GST_WARNING_OBJECT (src, "Capturing already ongoing"); g_mutex_unlock (&src->capturing_mutex); /* post a warning to notify camerabin2 that the capture failed */ GST_ELEMENT_WARNING (src, RESOURCE, BUSY, (NULL), (NULL)); return; } src->capturing = TRUE; g_object_notify (G_OBJECT (src), "ready-for-capture"); if (klass->start_capture (src)) { GST_DEBUG_OBJECT (src, "Capture started"); } else { src->capturing = FALSE; g_object_notify (G_OBJECT (src), "ready-for-capture"); GST_WARNING_OBJECT (src, "Failed to start capture"); } g_mutex_unlock (&src->capturing_mutex); } static void gst_base_camera_src_stop_capture (GstBaseCameraSrc * src) { GstBaseCameraSrcClass *klass = GST_BASE_CAMERA_SRC_GET_CLASS (src); g_return_if_fail (klass->stop_capture != NULL); g_mutex_lock (&src->capturing_mutex); if (!src->capturing) { GST_DEBUG_OBJECT (src, "No ongoing capture"); g_mutex_unlock (&src->capturing_mutex); return; } klass->stop_capture (src); g_mutex_unlock (&src->capturing_mutex); } void gst_base_camera_src_finish_capture (GstBaseCameraSrc * self) { GST_DEBUG_OBJECT (self, "Finishing capture"); g_return_if_fail (self->capturing); self->capturing = FALSE; g_object_notify (G_OBJECT (self), "ready-for-capture"); } static void gst_base_camera_src_dispose (GObject * object) { GstBaseCameraSrc *src = GST_BASE_CAMERA_SRC_CAST (object); g_mutex_clear (&src->capturing_mutex); if (src->preview_pipeline) { gst_camerabin_destroy_preview_pipeline (src->preview_pipeline); src->preview_pipeline = NULL; } if (src->preview_caps) gst_caps_replace (&src->preview_caps, NULL); if (src->preview_filter) { gst_object_unref (src->preview_filter); src->preview_filter = NULL; } G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_base_camera_src_finalize (GstBaseCameraSrc * self) { G_OBJECT_CLASS (parent_class)->finalize ((GObject *) (self)); } static void gst_base_camera_src_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstBaseCameraSrc *self = GST_BASE_CAMERA_SRC (object); switch (prop_id) { case PROP_MODE: gst_base_camera_src_set_mode (GST_BASE_CAMERA_SRC (self), g_value_get_enum (value)); break; case PROP_ZOOM:{ self->zoom = g_value_get_float (value); /* limit to max-zoom */ if (self->zoom > self->max_zoom) { GST_DEBUG_OBJECT (self, "Clipping zoom %f to max-zoom %f", self->zoom, self->max_zoom); self->zoom = self->max_zoom; } /* does not set it if in NULL, the src is not created yet */ if (GST_STATE (self) != GST_STATE_NULL) gst_base_camera_src_setup_zoom (self); break; } case PROP_POST_PREVIEW: self->post_preview = g_value_get_boolean (value); break; case PROP_PREVIEW_CAPS:{ GstCaps *new_caps; new_caps = (GstCaps *) gst_value_get_caps (value); if (new_caps == NULL) { new_caps = gst_caps_new_any (); } else { new_caps = gst_caps_ref (new_caps); } if (!gst_caps_is_equal (self->preview_caps, new_caps)) { gst_caps_replace (&self->preview_caps, new_caps); gst_base_camera_src_setup_preview (self, new_caps); } else { GST_DEBUG_OBJECT (self, "New preview caps equal current preview caps"); } gst_caps_unref (new_caps); } break; case PROP_PREVIEW_FILTER: if (self->preview_filter) gst_object_unref (self->preview_filter); self->preview_filter = g_value_dup_object (value); if (!gst_camerabin_preview_set_filter (self->preview_pipeline, self->preview_filter)) { GST_WARNING_OBJECT (self, "Cannot change preview filter, is element in NULL state?"); } break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec); break; } } static void gst_base_camera_src_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstBaseCameraSrc *self = GST_BASE_CAMERA_SRC (object); switch (prop_id) { case PROP_MODE: g_value_set_enum (value, self->mode); break; case PROP_READY_FOR_CAPTURE: g_value_set_boolean (value, !self->capturing); break; case PROP_ZOOM: g_value_set_float (value, self->zoom); break; case PROP_MAX_ZOOM: g_value_set_float (value, self->max_zoom); break; case PROP_POST_PREVIEW: g_value_set_boolean (value, self->post_preview); break; case PROP_PREVIEW_CAPS: if (self->preview_caps) gst_value_set_caps (value, self->preview_caps); break; case PROP_PREVIEW_FILTER: if (self->preview_filter) g_value_set_object (value, self->preview_filter); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec); break; } } static gboolean construct_pipeline (GstBaseCameraSrc * self) { GstBaseCameraSrcClass *bclass = GST_BASE_CAMERA_SRC_GET_CLASS (self); if (bclass->construct_pipeline) { if (!bclass->construct_pipeline (self)) { GST_ERROR_OBJECT (self, "pipeline construction failed"); return FALSE; } } return TRUE; } static gboolean setup_pipeline (GstBaseCameraSrc * self) { GstBaseCameraSrcClass *bclass = GST_BASE_CAMERA_SRC_GET_CLASS (self); if (bclass->setup_pipeline) return bclass->setup_pipeline (self); return TRUE; } static GstStateChangeReturn gst_base_camera_src_change_state (GstElement * element, GstStateChange transition) { GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; GstBaseCameraSrc *self = GST_BASE_CAMERA_SRC (element); GST_DEBUG_OBJECT (self, "%d -> %d", GST_STATE_TRANSITION_CURRENT (transition), GST_STATE_TRANSITION_NEXT (transition)); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: if (!construct_pipeline (self)) return GST_STATE_CHANGE_FAILURE; if (self->preview_pipeline == NULL) { /* failed to create preview pipeline, fail state change */ return GST_STATE_CHANGE_FAILURE; } if (self->preview_caps) { GST_DEBUG_OBJECT (self, "Setting preview pipeline caps %" GST_PTR_FORMAT, self->preview_caps); gst_camerabin_preview_set_caps (self->preview_pipeline, self->preview_caps); } break; case GST_STATE_CHANGE_READY_TO_PAUSED: if (!setup_pipeline (self)) return GST_STATE_CHANGE_FAILURE; /* without this the preview pipeline will not post buffer * messages on the pipeline */ gst_element_set_state (self->preview_pipeline->pipeline, GST_STATE_PLAYING); break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: gst_element_set_state (self->preview_pipeline->pipeline, GST_STATE_READY); break; case GST_STATE_CHANGE_READY_TO_NULL: gst_element_set_state (self->preview_pipeline->pipeline, GST_STATE_NULL); break; default: break; } return ret; } static void gst_base_camera_src_class_init (GstBaseCameraSrcClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GST_DEBUG_CATEGORY_INIT (base_camera_src_debug, "base_camera_src", 0, "Base camera src"); gobject_class = G_OBJECT_CLASS (klass); gstelement_class = GST_ELEMENT_CLASS (klass); gobject_class->dispose = gst_base_camera_src_dispose; gobject_class->finalize = (GObjectFinalizeFunc) gst_base_camera_src_finalize; gobject_class->set_property = gst_base_camera_src_set_property; gobject_class->get_property = gst_base_camera_src_get_property; g_object_class_install_property (gobject_class, PROP_MODE, g_param_spec_enum ("mode", "Mode", "The capture mode (still image capture or video recording)", GST_TYPE_CAMERABIN_MODE, MODE_IMAGE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ZOOM, g_param_spec_float ("zoom", "Zoom", "Digital zoom factor (e.g. 1.5 means 1.5x)", MIN_ZOOM, G_MAXFLOAT, DEFAULT_ZOOM, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_MAX_ZOOM, g_param_spec_float ("max-zoom", "Maximum zoom level (note: may change " "depending on resolution/implementation)", "Digital zoom factor (e.g. 1.5 means 1.5x)", MIN_ZOOM, G_MAXFLOAT, MAX_ZOOM, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); /** * GstBaseCameraSrc:post-previews: * * When %TRUE, preview images should be posted to the bus when * captures are made */ g_object_class_install_property (gobject_class, PROP_POST_PREVIEW, g_param_spec_boolean ("post-previews", "Post Previews", "If capture preview images should be posted to the bus", DEFAULT_POST_PREVIEW, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_PREVIEW_CAPS, g_param_spec_boxed ("preview-caps", "Preview caps", "The caps of the preview image to be posted (NULL means ANY)", GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_PREVIEW_FILTER, g_param_spec_object ("preview-filter", "Preview filter", "A custom preview filter to process preview image data", GST_TYPE_ELEMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstBaseCameraSrc:ready-for-capture: * * When TRUE new capture can be prepared. If FALSE capturing is ongoing * and starting a new capture immediately is not possible. * * Note that calling start-capture from the notify callback of this property * will cause a deadlock. If you need to react like this on the notify * function, please schedule a new thread to do it. If you're using glib's * mainloop you can use g_idle_add() for example. */ g_object_class_install_property (gobject_class, PROP_READY_FOR_CAPTURE, g_param_spec_boolean ("ready-for-capture", "Ready for capture", "Informs this element is ready for starting another capture", TRUE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); /* Signals */ basecamerasrc_signals[START_CAPTURE_SIGNAL] = g_signal_new_class_handler ("start-capture", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_base_camera_src_start_capture), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); basecamerasrc_signals[STOP_CAPTURE_SIGNAL] = g_signal_new_class_handler ("stop-capture", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_base_camera_src_stop_capture), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); gstelement_class->change_state = gst_base_camera_src_change_state; gst_element_class_set_details_simple (gstelement_class, "Base class for camerabin src bin", "Source/Video", "Abstracts capture device for camerabin2", "Rob Clark "); } static void gst_base_camera_src_init (GstBaseCameraSrc * self) { self->width = DEFAULT_WIDTH; self->height = DEFAULT_HEIGHT; self->zoom = DEFAULT_ZOOM; self->max_zoom = MAX_ZOOM; self->mode = MODE_IMAGE; self->capturing = FALSE; g_mutex_init (&self->capturing_mutex); self->post_preview = DEFAULT_POST_PREVIEW; self->preview_caps = gst_caps_new_any (); self->preview_pipeline = gst_camerabin_create_preview_pipeline (GST_ELEMENT_CAST (self), NULL); } void gst_base_camera_src_post_preview (GstBaseCameraSrc * self, GstSample * sample) { if (self->post_preview) { gst_camerabin_preview_pipeline_post (self->preview_pipeline, sample); } else { GST_DEBUG_OBJECT (self, "Previews not enabled, not posting"); } }