588 lines
18 KiB
C
588 lines
18 KiB
C
/*
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* GStreamer
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* Copyright (C) 2010 Texas Instruments, Inc
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-basecamerasrc
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*
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* Base class for the camera source bin used by camerabin for capture.
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* Sophisticated camera hardware can derive from this baseclass and map the
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* features to this interface.
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*
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* The design mandates that the subclasses implement the following features and
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* behaviour:
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*
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* * 3 pads: viewfinder, image capture, video capture
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*
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* During `construct_pipeline()` vmethod a subclass can add several elements into
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* the bin and expose 3 srcs pads as ghostpads implementing the 3 pad templates.
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*
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* However the subclass is responsible for adding the pad templates for the
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* source pads and they must be named "vidsrc", "imgsrc" and "vfsrc". The pad
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* templates should be installed in the subclass' class_init function, like so:
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* |[
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* static void
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* my_element_class_init (GstMyElementClass *klass)
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* {
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* GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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* // pad templates should be a #GstStaticPadTemplate with direction
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* // #GST_PAD_SRC and name "vidsrc", "imgsrc" and "vfsrc"
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* gst_element_class_add_static_pad_template (gstelement_class,
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* &vidsrc_template);
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* gst_element_class_add_static_pad_template (gstelement_class,
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* &imgsrc_template);
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* gst_element_class_add_static_pad_template (gstelement_class,
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* &vfsrc_template);
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* // see #GstElementDetails
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* gst_element_class_set_details (gstelement_class, &details);
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* }
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* ]|
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*
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* It is also possible to add regular pads from the subclass and implement the
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* dataflow methods on these pads. This way all functionality can be implemented
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* directly in the subclass without extra elements.
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*
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* The src will receive the capture mode from `GstCameraBin2` on the
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* #GstBaseCameraSrc:mode property. Possible capture modes are defined in
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* #GstCameraBinMode.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <gst/glib-compat-private.h>
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#include "gstbasecamerasrc.h"
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#define DEFAULT_WIDTH 640
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#define DEFAULT_HEIGHT 480
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#define DEFAULT_CAPTURE_WIDTH 800
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#define DEFAULT_CAPTURE_HEIGHT 600
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#define DEFAULT_FPS_N 0 /* makes it use the default */
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#define DEFAULT_FPS_D 1
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#define DEFAULT_ZOOM MIN_ZOOM
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enum
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{
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PROP_0,
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PROP_MODE,
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PROP_ZOOM,
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PROP_MAX_ZOOM,
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PROP_READY_FOR_CAPTURE,
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PROP_POST_PREVIEW,
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PROP_PREVIEW_CAPS,
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PROP_PREVIEW_FILTER,
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PROP_AUTO_START
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};
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enum
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{
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/* action signals */
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START_CAPTURE_SIGNAL,
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STOP_CAPTURE_SIGNAL,
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/* emit signals */
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LAST_SIGNAL
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};
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#define DEFAULT_POST_PREVIEW TRUE
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#define DEFAULT_AUTO_START FALSE
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static guint basecamerasrc_signals[LAST_SIGNAL];
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GST_DEBUG_CATEGORY (base_camera_src_debug);
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#define GST_CAT_DEFAULT base_camera_src_debug
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#define parent_class gst_base_camera_src_parent_class
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G_DEFINE_TYPE (GstBaseCameraSrc, gst_base_camera_src, GST_TYPE_BIN);
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/* NOTE: we could provide a vmethod for derived class to overload to provide
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* it's own implementation of interface.. but in all cases I can think of at
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* moment, either the camerasrc itself, or some element within the bin, will
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* be implementing the interface..
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*/
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/**
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* gst_base_camera_src_set_mode:
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* @self: the camerasrc bin
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* @mode: the mode
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*
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* Set the chosen #GstCameraBinMode capture mode.
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*/
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gboolean
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gst_base_camera_src_set_mode (GstBaseCameraSrc * self, GstCameraBinMode mode)
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{
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GstBaseCameraSrcClass *bclass = GST_BASE_CAMERA_SRC_GET_CLASS (self);
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g_return_val_if_fail (bclass->set_mode, FALSE);
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if (bclass->set_mode (self, mode)) {
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self->mode = mode;
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return TRUE;
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}
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return FALSE;
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}
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/**
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* gst_base_camera_src_setup_zoom:
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* @self: camerasrc object
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*
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* Apply zoom configured to camerabin to capture.
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*/
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void
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gst_base_camera_src_setup_zoom (GstBaseCameraSrc * self)
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{
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GstBaseCameraSrcClass *bclass = GST_BASE_CAMERA_SRC_GET_CLASS (self);
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g_return_if_fail (self->zoom);
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g_return_if_fail (bclass->set_zoom);
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bclass->set_zoom (self, self->zoom);
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}
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/**
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* gst_base_camera_src_setup_preview:
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* @self: camerasrc bin
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* @preview_caps: preview caps to set
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*
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* Apply preview caps to preview pipeline and to video source.
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*/
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void
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gst_base_camera_src_setup_preview (GstBaseCameraSrc * self,
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GstCaps * preview_caps)
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{
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GstBaseCameraSrcClass *bclass = GST_BASE_CAMERA_SRC_GET_CLASS (self);
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if (self->preview_pipeline) {
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GST_DEBUG_OBJECT (self,
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"Setting preview pipeline caps %" GST_PTR_FORMAT, self->preview_caps);
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gst_camerabin_preview_set_caps (self->preview_pipeline, preview_caps);
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}
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if (bclass->set_preview)
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bclass->set_preview (self, preview_caps);
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}
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static void
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gst_base_camera_src_start_capture (GstBaseCameraSrc * src)
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{
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GstBaseCameraSrcClass *klass = GST_BASE_CAMERA_SRC_GET_CLASS (src);
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g_return_if_fail (klass->start_capture != NULL);
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GST_DEBUG_OBJECT (src, "Starting capture");
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g_mutex_lock (&src->capturing_mutex);
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if (src->capturing) {
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GST_WARNING_OBJECT (src, "Capturing already ongoing");
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g_mutex_unlock (&src->capturing_mutex);
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/* post a warning to notify camerabin2 that the capture failed */
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GST_ELEMENT_WARNING (src, RESOURCE, BUSY, (NULL), (NULL));
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return;
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}
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src->capturing = TRUE;
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g_object_notify (G_OBJECT (src), "ready-for-capture");
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if (klass->start_capture (src)) {
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GST_DEBUG_OBJECT (src, "Capture started");
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} else {
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src->capturing = FALSE;
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g_object_notify (G_OBJECT (src), "ready-for-capture");
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GST_WARNING_OBJECT (src, "Failed to start capture");
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}
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g_mutex_unlock (&src->capturing_mutex);
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}
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static void
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gst_base_camera_src_stop_capture (GstBaseCameraSrc * src)
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{
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GstBaseCameraSrcClass *klass = GST_BASE_CAMERA_SRC_GET_CLASS (src);
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g_return_if_fail (klass->stop_capture != NULL);
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g_mutex_lock (&src->capturing_mutex);
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if (!src->capturing) {
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GST_DEBUG_OBJECT (src, "No ongoing capture");
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g_mutex_unlock (&src->capturing_mutex);
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return;
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}
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klass->stop_capture (src);
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g_mutex_unlock (&src->capturing_mutex);
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}
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void
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gst_base_camera_src_finish_capture (GstBaseCameraSrc * self)
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{
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GST_DEBUG_OBJECT (self, "Finishing capture");
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g_return_if_fail (self->capturing);
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self->capturing = FALSE;
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g_object_notify (G_OBJECT (self), "ready-for-capture");
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}
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static void
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gst_base_camera_src_dispose (GObject * object)
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{
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GstBaseCameraSrc *src = GST_BASE_CAMERA_SRC_CAST (object);
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g_mutex_clear (&src->capturing_mutex);
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if (src->preview_pipeline) {
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gst_camerabin_destroy_preview_pipeline (src->preview_pipeline);
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src->preview_pipeline = NULL;
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}
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if (src->preview_caps)
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gst_caps_replace (&src->preview_caps, NULL);
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if (src->preview_filter) {
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gst_object_unref (src->preview_filter);
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src->preview_filter = NULL;
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}
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gst_base_camera_src_finalize (GstBaseCameraSrc * self)
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{
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G_OBJECT_CLASS (parent_class)->finalize ((GObject *) (self));
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}
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static void
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gst_base_camera_src_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec)
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{
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GstBaseCameraSrc *self = GST_BASE_CAMERA_SRC (object);
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switch (prop_id) {
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case PROP_MODE:
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gst_base_camera_src_set_mode (GST_BASE_CAMERA_SRC (self),
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g_value_get_enum (value));
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break;
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case PROP_ZOOM:{
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self->zoom = g_value_get_float (value);
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/* limit to max-zoom */
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if (self->zoom > self->max_zoom) {
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GST_DEBUG_OBJECT (self, "Clipping zoom %f to max-zoom %f", self->zoom,
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self->max_zoom);
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self->zoom = self->max_zoom;
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}
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/* does not set it if in NULL, the src is not created yet */
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if (GST_STATE (self) != GST_STATE_NULL)
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gst_base_camera_src_setup_zoom (self);
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break;
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}
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case PROP_POST_PREVIEW:
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self->post_preview = g_value_get_boolean (value);
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break;
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case PROP_PREVIEW_CAPS:{
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GstCaps *new_caps;
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new_caps = (GstCaps *) gst_value_get_caps (value);
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if (new_caps == NULL) {
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new_caps = gst_caps_new_any ();
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} else {
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new_caps = gst_caps_ref (new_caps);
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}
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if (!gst_caps_is_equal (self->preview_caps, new_caps)) {
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gst_caps_replace (&self->preview_caps, new_caps);
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gst_base_camera_src_setup_preview (self, new_caps);
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} else {
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GST_DEBUG_OBJECT (self, "New preview caps equal current preview caps");
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}
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gst_caps_unref (new_caps);
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}
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break;
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case PROP_PREVIEW_FILTER:
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if (self->preview_filter)
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gst_object_unref (self->preview_filter);
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self->preview_filter = g_value_dup_object (value);
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if (!gst_camerabin_preview_set_filter (self->preview_pipeline,
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self->preview_filter)) {
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GST_WARNING_OBJECT (self,
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"Cannot change preview filter, is element in NULL state?");
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}
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break;
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case PROP_AUTO_START:
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self->auto_start = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
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break;
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}
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}
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static void
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gst_base_camera_src_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec)
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{
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GstBaseCameraSrc *self = GST_BASE_CAMERA_SRC (object);
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switch (prop_id) {
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case PROP_MODE:
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g_value_set_enum (value, self->mode);
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break;
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case PROP_READY_FOR_CAPTURE:
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g_value_set_boolean (value, !self->capturing);
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break;
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case PROP_ZOOM:
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g_value_set_float (value, self->zoom);
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break;
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case PROP_MAX_ZOOM:
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g_value_set_float (value, self->max_zoom);
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break;
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case PROP_POST_PREVIEW:
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g_value_set_boolean (value, self->post_preview);
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break;
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case PROP_PREVIEW_CAPS:
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if (self->preview_caps)
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gst_value_set_caps (value, self->preview_caps);
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break;
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case PROP_PREVIEW_FILTER:
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if (self->preview_filter)
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g_value_set_object (value, self->preview_filter);
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break;
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case PROP_AUTO_START:
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g_value_set_boolean (value, self->auto_start);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (self, prop_id, pspec);
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break;
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}
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}
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static gboolean
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construct_pipeline (GstBaseCameraSrc * self)
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{
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GstBaseCameraSrcClass *bclass = GST_BASE_CAMERA_SRC_GET_CLASS (self);
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if (bclass->construct_pipeline) {
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if (!bclass->construct_pipeline (self)) {
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GST_ERROR_OBJECT (self, "pipeline construction failed");
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return FALSE;
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}
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}
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return TRUE;
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}
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static gboolean
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setup_pipeline (GstBaseCameraSrc * self)
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{
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GstBaseCameraSrcClass *bclass = GST_BASE_CAMERA_SRC_GET_CLASS (self);
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if (bclass->setup_pipeline)
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return bclass->setup_pipeline (self);
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return TRUE;
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}
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static GstStateChangeReturn
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gst_base_camera_src_change_state (GstElement * element,
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GstStateChange transition)
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{
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GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
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GstBaseCameraSrc *self = GST_BASE_CAMERA_SRC (element);
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GST_DEBUG_OBJECT (self, "%d -> %d",
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GST_STATE_TRANSITION_CURRENT (transition),
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GST_STATE_TRANSITION_NEXT (transition));
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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if (!construct_pipeline (self))
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return GST_STATE_CHANGE_FAILURE;
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if (self->preview_pipeline == NULL) {
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/* failed to create preview pipeline, fail state change */
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return GST_STATE_CHANGE_FAILURE;
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}
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if (self->preview_caps) {
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GST_DEBUG_OBJECT (self,
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"Setting preview pipeline caps %" GST_PTR_FORMAT,
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self->preview_caps);
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gst_camerabin_preview_set_caps (self->preview_pipeline,
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self->preview_caps);
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}
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break;
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case GST_STATE_CHANGE_READY_TO_PAUSED:
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if (!setup_pipeline (self))
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return GST_STATE_CHANGE_FAILURE;
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/* without this the preview pipeline will not post buffer
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* messages on the pipeline */
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gst_element_set_state (self->preview_pipeline->pipeline,
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GST_STATE_PLAYING);
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if (self->auto_start)
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g_signal_emit_by_name (G_OBJECT (self), "start-capture", NULL);
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_element_set_state (self->preview_pipeline->pipeline, GST_STATE_READY);
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if (self->auto_start)
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g_signal_emit_by_name (G_OBJECT (self), "stop-capture", NULL);
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break;
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case GST_STATE_CHANGE_READY_TO_NULL:
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gst_element_set_state (self->preview_pipeline->pipeline, GST_STATE_NULL);
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break;
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default:
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break;
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}
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return ret;
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}
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static void
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gst_base_camera_src_class_init (GstBaseCameraSrcClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GST_DEBUG_CATEGORY_INIT (base_camera_src_debug, "base_camera_src", 0,
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"Base camera src");
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gobject_class = G_OBJECT_CLASS (klass);
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gstelement_class = GST_ELEMENT_CLASS (klass);
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gobject_class->dispose = gst_base_camera_src_dispose;
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gobject_class->finalize = (GObjectFinalizeFunc) gst_base_camera_src_finalize;
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gobject_class->set_property = gst_base_camera_src_set_property;
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gobject_class->get_property = gst_base_camera_src_get_property;
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g_object_class_install_property (gobject_class, PROP_MODE,
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g_param_spec_enum ("mode", "Mode",
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"The capture mode (still image capture or video recording)",
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GST_TYPE_CAMERABIN_MODE, MODE_IMAGE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_ZOOM,
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g_param_spec_float ("zoom", "Zoom",
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"Digital zoom factor (e.g. 1.5 means 1.5x)", MIN_ZOOM, G_MAXFLOAT,
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DEFAULT_ZOOM, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_MAX_ZOOM,
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g_param_spec_float ("max-zoom", "Maximum zoom level (note: may change "
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"depending on resolution/implementation)",
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"Digital zoom factor (e.g. 1.5 means 1.5x)", MIN_ZOOM, G_MAXFLOAT,
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MAX_ZOOM, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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/**
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* GstBaseCameraSrc:post-previews:
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*
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* When %TRUE, preview images should be posted to the bus when
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* captures are made
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*/
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g_object_class_install_property (gobject_class, PROP_POST_PREVIEW,
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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));
|
|
|
|
g_object_class_install_property (gobject_class, PROP_AUTO_START,
|
|
g_param_spec_boolean ("auto-start", "Auto start capture",
|
|
"Automatically starts capture when going to the PAUSED state",
|
|
DEFAULT_AUTO_START, 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, NULL, 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, NULL, G_TYPE_NONE, 0);
|
|
|
|
gstelement_class->change_state = gst_base_camera_src_change_state;
|
|
|
|
gst_element_class_set_static_metadata (gstelement_class,
|
|
"Base class for camerabin src bin", "Source/Video",
|
|
"Abstracts capture device for camerabin2", "Rob Clark <rob@ti.com>");
|
|
}
|
|
|
|
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->auto_start = DEFAULT_AUTO_START;
|
|
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");
|
|
}
|
|
}
|