camerabin2: Add methods for preview image message posting
Adds a helper struct and functions for implementing a preview message in camerabin2.
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@ -52,6 +52,8 @@ typedef struct _GstBaseCameraSrcClass GstBaseCameraSrcClass;
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#define GST_BASE_CAMERA_SRC_IMAGE_PAD_NAME "imgsrc"
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#define GST_BASE_CAMERA_SRC_IMAGE_PAD_NAME "imgsrc"
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#define GST_BASE_CAMERA_SRC_VIDEO_PAD_NAME "vidsrc"
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#define GST_BASE_CAMERA_SRC_VIDEO_PAD_NAME "vidsrc"
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#define GST_BASE_CAMERA_SRC_PREVIEW_MESSAGE_NAME "preview-image"
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/**
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/**
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* GstBaseCameraSrc:
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* GstBaseCameraSrc:
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*/
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*/
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@ -17,7 +17,7 @@ libgstcamerabin2_la_CFLAGS = \
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libgstcamerabin2_la_LIBADD = \
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libgstcamerabin2_la_LIBADD = \
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$(top_builddir)/gst-libs/gst/interfaces/libgstphotography-$(GST_MAJORMINOR).la \
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$(top_builddir)/gst-libs/gst/interfaces/libgstphotography-$(GST_MAJORMINOR).la \
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$(top_builddir)/gst-libs/gst/basecamerabinsrc/libgstbasecamerabinsrc-$(GST_MAJORMINOR).la \
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$(top_builddir)/gst-libs/gst/basecamerabinsrc/libgstbasecamerabinsrc-$(GST_MAJORMINOR).la \
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$(GST_PLUGINS_BASE_LIBS) -lgstinterfaces-$(GST_MAJORMINOR) -lgsttag-$(GST_MAJORMINOR) \
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$(GST_PLUGINS_BASE_LIBS) -lgstinterfaces-$(GST_MAJORMINOR) -lgsttag-$(GST_MAJORMINOR) -lgstapp-$(GST_MAJORMINOR) \
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$(GST_BASE_LIBS) $(GST_LIBS)
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$(GST_BASE_LIBS) $(GST_LIBS)
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libgstcamerabin2_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
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libgstcamerabin2_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
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@ -28,8 +28,11 @@
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*/
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*/
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#include <string.h>
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#include <string.h>
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#include "camerabingeneral.h"
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#include <glib.h>
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#include <glib.h>
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#include <gst/app/gstappsrc.h>
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#include <gst/app/gstappsink.h>
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#include <gst/basecamerabinsrc/gstbasecamerasrc.h>
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#include "camerabingeneral.h"
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/**
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/**
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* gst_camerabin_add_element:
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* gst_camerabin_add_element:
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@ -272,3 +275,184 @@ gst_camerabin_drop_eos_probe (GstPad * pad, GstEvent * event, gpointer u_data)
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}
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}
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return ret;
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return ret;
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}
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}
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static GstFlowReturn
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gst_camerabin_preview_pipeline_new_preroll (GstAppSink * appsink,
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gpointer user_data)
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{
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GstBuffer *buffer;
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buffer = gst_app_sink_pull_preroll (appsink);
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gst_buffer_unref (buffer);
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return GST_FLOW_OK;
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}
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static GstFlowReturn
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gst_camerabin_preview_pipeline_new_buffer (GstAppSink * appsink,
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gpointer user_data)
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{
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GstBuffer *buffer;
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GstStructure *s;
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GstMessage *msg;
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GstCameraBinPreviewPipelineData *data;
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data = user_data;
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buffer = gst_app_sink_pull_buffer (appsink);
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s = gst_structure_new (GST_BASE_CAMERA_SRC_PREVIEW_MESSAGE_NAME,
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"buffer", GST_TYPE_BUFFER, buffer, NULL);
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gst_buffer_unref (buffer);
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msg = gst_message_new_element (GST_OBJECT (data->element), s);
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GST_DEBUG_OBJECT (data->element, "sending message with preview image");
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if (gst_element_post_message (data->element, msg) == FALSE) {
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GST_WARNING_OBJECT (data->element,
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"This element has no bus, therefore no message sent!");
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}
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return GST_FLOW_OK;
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}
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/**
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* gst_camerabin_create_preview_pipeline:
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* @element: Owner of this pipeline
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*
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* Creates a new previewing pipeline that can receive buffers
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* to be posted as camerabin preview messages for @element
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*
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* Returns: The newly created #GstCameraBinPreviewPipelineData
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*/
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GstCameraBinPreviewPipelineData *
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gst_camerabin_create_preview_pipeline (GstElement * element)
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{
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GstCameraBinPreviewPipelineData *data;
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GstElement *csp;
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GstElement *csp2;
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GstElement *vscale;
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gboolean added = FALSE;
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GstAppSinkCallbacks callbacks = { 0, };
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data = g_new (GstCameraBinPreviewPipelineData, 1);
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data->pipeline = gst_pipeline_new ("preview-pipeline");
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data->appsrc = gst_element_factory_make ("appsrc", "preview-appsrc");
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data->capsfilter = gst_element_factory_make ("capsfilter",
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"preview-capsfilter");
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data->appsink = gst_element_factory_make ("appsink", "preview-appsink");
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csp = gst_element_factory_make ("ffmpegcolorspace", "preview-csp0");
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csp2 = gst_element_factory_make ("ffmpegcolorspace", "preview-csp1");
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vscale = gst_element_factory_make ("videoscale", "preview-vscale");
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if (!data->appsrc || !data->capsfilter || !data->appsink || !csp ||
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!csp2 || !vscale) {
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goto error;
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}
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gst_bin_add_many (GST_BIN (data->pipeline), data->appsrc, data->capsfilter,
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data->appsink, csp, csp2, vscale, NULL);
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added = TRUE;
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if (!gst_element_link_many (data->appsrc, csp, vscale, csp2, data->capsfilter,
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data->appsink, NULL))
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goto error;
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callbacks.new_preroll = gst_camerabin_preview_pipeline_new_preroll;
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callbacks.new_buffer = gst_camerabin_preview_pipeline_new_buffer;
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gst_app_sink_set_callbacks ((GstAppSink *) data->appsink, &callbacks, data,
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NULL);
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data->element = element;
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return data;
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error:
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GST_WARNING ("Failed to create camerabin's preview pipeline");
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if (!added) {
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if (csp)
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gst_object_unref (csp);
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if (csp2)
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gst_object_unref (csp2);
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if (vscale)
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gst_object_unref (vscale);
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if (data->appsrc)
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gst_object_unref (data->appsrc);
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if (data->capsfilter)
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gst_object_unref (data->capsfilter);
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if (data->appsink)
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gst_object_unref (data->appsink);
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}
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gst_camerabin_destroy_preview_pipeline (data);
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return NULL;
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}
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/**
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* gst_camerabin_destroy_preview_pipeline:
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* @preview: the #GstCameraBinPreviewPipelineData
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*
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* Frees a #GstCameraBinPreviewPipelineData
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*/
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void
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gst_camerabin_destroy_preview_pipeline (GstCameraBinPreviewPipelineData *
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preview)
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{
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if (preview->pipeline) {
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gst_element_set_state (preview->pipeline, GST_STATE_NULL);
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gst_object_unref (preview->pipeline);
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}
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g_free (preview);
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}
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/**
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* gst_camerabin_preview_pipeline_post:
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* @preview: the #GstCameraBinPreviewPipelineData
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* @buffer: the buffer to be posted as a preview
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*
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* Converts the @buffer to the desired format and posts the preview
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* message to the bus.
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*
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* Returns: %TRUE on success
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*/
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gboolean
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gst_camerabin_preview_pipeline_post (GstCameraBinPreviewPipelineData * preview,
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GstBuffer * buffer)
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{
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g_return_val_if_fail (preview != NULL, FALSE);
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g_return_val_if_fail (preview->pipeline != NULL, FALSE);
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g_return_val_if_fail (buffer, FALSE);
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gst_app_src_push_buffer ((GstAppSrc *) preview->appsrc,
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gst_buffer_ref (buffer));
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return TRUE;
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}
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/**
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* gst_camerabin_preview_set_caps:
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* @preview: the #GstCameraBinPreviewPipelineData
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* @caps: the #GstCaps to be set
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*
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* The caps that preview buffers should have when posted
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* on the bus
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*/
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void
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gst_camerabin_preview_set_caps (GstCameraBinPreviewPipelineData * preview,
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GstCaps * caps)
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{
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GstState state, pending;
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GstStateChangeReturn ret;
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g_return_if_fail (preview != NULL);
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ret = gst_element_get_state (preview->pipeline, &state, &pending, 0);
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if (ret == GST_STATE_CHANGE_FAILURE) {
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/* make it try again */
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state = GST_STATE_PLAYING;
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pending = GST_STATE_VOID_PENDING;
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}
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gst_element_set_state (preview->pipeline, GST_STATE_NULL);
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g_object_set (preview->capsfilter, "caps", caps, NULL);
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if (pending != GST_STATE_VOID_PENDING)
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state = pending;
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gst_element_set_state (preview->pipeline, state);
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}
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@ -23,6 +23,22 @@
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#include <gst/gst.h>
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#include <gst/gst.h>
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typedef struct
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{
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GstElement *pipeline;
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GstElement *appsrc;
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GstElement *capsfilter;
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GstElement *appsink;
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GstElement *element;
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} GstCameraBinPreviewPipelineData;
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GstCameraBinPreviewPipelineData *gst_camerabin_create_preview_pipeline (GstElement * element);
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void gst_camerabin_destroy_preview_pipeline (GstCameraBinPreviewPipelineData * preview);
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gboolean gst_camerabin_preview_pipeline_post (GstCameraBinPreviewPipelineData * preview, GstBuffer * buffer);
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void gst_camerabin_preview_set_caps (GstCameraBinPreviewPipelineData * preview, GstCaps * caps);
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gboolean gst_camerabin_try_add_element (GstBin * bin, const gchar * srcpad, GstElement * new_elem, const gchar * dstpad);
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gboolean gst_camerabin_try_add_element (GstBin * bin, const gchar * srcpad, GstElement * new_elem, const gchar * dstpad);
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gboolean gst_camerabin_add_element (GstBin * bin, GstElement * new_elem);
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gboolean gst_camerabin_add_element (GstBin * bin, GstElement * new_elem);
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gboolean gst_camerabin_add_element_full (GstBin * bin, const gchar * srcpad, GstElement * new_elem, const gchar * dstpad);
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gboolean gst_camerabin_add_element_full (GstBin * bin, const gchar * srcpad, GstElement * new_elem, const gchar * dstpad);
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