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gstreamer/gst-libs/gst/basecamerabinsrc/gstbasecamerasrc.c

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/*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, 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:
* <itemizedlist>
* <listitem><para>
* 3 pads: viewfinder, image capture, video capture
* </para></listitem>
* <listitem><para>
* </para></listitem>
* </itemizedlist>
*
* 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,
* &amp;vidsrc_template);
* gst_element_class_add_static_pad_template (gstelement_class,
* &amp;imgsrc_template);
* gst_element_class_add_static_pad_template (gstelement_class,
* &amp;vfsrc_template);
* // see #GstElementDetails
* gst_element_class_set_details (gstelement_class, &amp;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 <config.h>
#endif
#include <gst/glib-compat-private.h>
#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,
PROP_AUTO_START
};
enum
{
/* action signals */
START_CAPTURE_SIGNAL,
STOP_CAPTURE_SIGNAL,
/* emit signals */
LAST_SIGNAL
};
#define DEFAULT_POST_PREVIEW TRUE
#define DEFAULT_AUTO_START FALSE
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;
case PROP_AUTO_START:
self->auto_start = g_value_get_boolean (value);
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;
case PROP_AUTO_START:
g_value_set_boolean (value, self->auto_start);
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);
if (self->auto_start)
g_signal_emit_by_name (G_OBJECT (self), "start-capture", NULL);
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);
if (self->auto_start)
g_signal_emit_by_name (G_OBJECT (self), "stop-capture", NULL);
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));
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, 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_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");
}
}
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