gstreamer/gst/camerabin2/gstwrappercamerabinsrc.h

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/*
* GStreamer
* Copyright (C) 2010 Texas Instruments, Inc
* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_WRAPPER_CAMERA_BIN_SRC_H__
#define __GST_WRAPPER_CAMERA_BIN_SRC_H__
#include <gst/gst.h>
#include <gst/basecamerabinsrc/gstbasecamerasrc.h>
#include <gst/basecamerabinsrc/gstcamerabinpreview.h>
#include "camerabingeneral.h"
G_BEGIN_DECLS
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#define GST_TYPE_WRAPPER_CAMERA_BIN_SRC \
(gst_wrapper_camera_bin_src_get_type())
#define GST_WRAPPER_CAMERA_BIN_SRC(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_WRAPPER_CAMERA_BIN_SRC,GstWrapperCameraBinSrc))
#define GST_WRAPPER_CAMERA_BIN_SRC_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_WRAPPER_CAMERA_BIN_SRC,GstWrapperCameraBinSrcClass))
#define GST_IS_WRAPPER_CAMERA_BIN_SRC(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_WRAPPER_CAMERA_BIN_SRC))
#define GST_IS_WRAPPER_CAMERA_BIN_SRC_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_WRAPPER_CAMERA_BIN_SRC))
GType gst_wrapper_camera_bin_src_get_type (void);
typedef struct _GstWrapperCameraBinSrc GstWrapperCameraBinSrc;
typedef struct _GstWrapperCameraBinSrcClass GstWrapperCameraBinSrcClass;
enum GstVideoRecordingStatus {
GST_VIDEO_RECORDING_STATUS_DONE,
GST_VIDEO_RECORDING_STATUS_STARTING,
GST_VIDEO_RECORDING_STATUS_RUNNING,
GST_VIDEO_RECORDING_STATUS_FINISHING
};
/**
* GstWrapperCameraBinSrc:
*
*/
struct _GstWrapperCameraBinSrc
{
GstBaseCameraSrc parent;
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GstCameraBinMode mode;
GstPad *srcfilter_pad;
GstPad *vfsrc;
GstPad *imgsrc;
GstPad *vidsrc;
/* video recording controls */
gint video_rec_status;
/* image capture controls */
gint image_capture_count;
/* source elements */
GstElement *src_vid_src;
GstElement *video_filter;
GstElement *src_filter;
GstElement *digitalzoom;
/* Pad from our last element that is linked
* with the output pads */
GstPad *src_pad;
GstPad *video_tee_vf_pad;
GstPad *video_tee_sink;
gboolean elements_created;
gulong src_event_probe_id;
gulong src_max_zoom_signal_id;
gulong image_capture_probe;
gulong video_capture_probe;
/* Application configurable elements */
GstElement *app_vid_src;
GstElement *app_vid_filter;
/* Caps that videosrc supports */
GstCaps *allowed_caps;
wrappercamerabinsrc: Rework cropping for zoom and dimension reduction wrappercamerabinsrc has a videocrop element to be used for zooming and for cropping when input caps is different when used with the GstPhotography interface. The zooming part needs the following elements: capsfilter ! videocrop ! videoscale ! capsfilter The capsfilters should always have the same caps to ensure the zooming is done and preserves dimensions, unless when it is needed to do more cropping due to input dimensions those caps need to be modified accordingly to preserve the output dimensions. This, however, makes it hard to get caps negotiation to work properly as we need to have different caps in the capsfilters to account for the extra cropping needed. It could be simple for fixed caps but it gets tricky with unfixed ones. To solve this, this patch splits the zooming and dimension reduction cropping into 2 separate videocrop elements. The first one does the dimension cropping, which is only needed when the GstPhotography API is used and the source provides a caps that is different than what is requested, while the second is dedicated to zoom crop only. The first part of the pipeline goes from: src ! videoconvert ! capsfilter ! videocrop ! videoscale ! capsfilter to src ! videocrop ! videoconvert ! capsfilter ! videocrop ! videoscale ! capsfilter It might add an extra overhead in the image capture as the image might need to be cropped twice but this can be solved by enabling videocrop to use crop metas so only the later one does the real cropping. It also makes the code a bit simpler.
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/* Optional crop for frames. Used to crop frames e.g.
due to wrong aspect ratio. Done before the crop related to zooming. */
GstElement *src_crop;
/* Caps applied to capsfilters when in view finder mode */
GstCaps *view_finder_caps;
/* Caps applied to capsfilters when taking still image */
GstCaps *image_capture_caps;
gboolean image_renegotiate;
gboolean video_renegotiate;
};
/**
* GstWrapperCameraBinSrcClass:
*
*/
struct _GstWrapperCameraBinSrcClass
{
GstBaseCameraSrcClass parent;
};
GST_ELEMENT_REGISTER_DECLARE (wrappercamerabinsrc);
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G_END_DECLS
#endif /* __GST_WRAPPER_CAMERA_BIN_SRC_H__ */