Appsrc example with cairo

[Annick Fron]

Hi Luis,

Here is the link :
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-data-spoof.html

Instead of the white and black image, I draw some cairo.

I have tried it with glimagesink , and it seems to work, so probably the caps are wrong, but I took them from gstcairooverlay.c.

Annick

Le 29 oct. 2014 à 11:52, Luis de Bethencourt <luis at debethencourt.com> a écrit :

> Hi Annick,
> 
> Which doc did you grab this from? Just want to make sure it is proper ones.
> 
> Luis
> 
> On 28 October 2014 17:06, Annick Fron <list at afceurope.com> wrote:
> Hi,
> 
> I have copied from the doc the appsrc example, and tried to create contents using cairo, but the example does not work.
> 
> Any idea ?
> 
> Annick Fron
> 
> /*
> ============================================================================
> Name        : Cairo-src.c
> 
> ============================================================================
> */
> 
> 
> #include <gst/gst.h>
> #include <cairo.h>
> #include <gst/video/video.h>
> #include <stdio.h>
> 
> static GMainLoop *loop;
> 
> static void
> cb_need_data (GstElement *appsrc,
>         guint       unused_size,
>         gpointer    user_data)
> {
> static gboolean white = FALSE;
> static GstClockTime timestamp = 0;
> GstBuffer *buffer;
> GstMapInfo info;
> guint size;
> GstFlowReturn ret;
> GstMemory * memory;
> cairo_t *  cr;
> 
> 
> cairo_surface_t * imageSurface;
> 
> 
> size = 640 * 50 * 4;
> 
> buffer = gst_buffer_new_allocate (NULL, size, NULL);
> 
> 
> memory=gst_buffer_get_all_memory(buffer);
> gst_buffer_make_writable(buffer);
> gst_buffer_map (buffer, &info, GST_MAP_WRITE);
>     printf("buffer \n");
> imageSurface = cairo_image_surface_create_for_data (info.data,
>         CAIRO_FORMAT_ARGB32,
>         640,
>         50,
>         640*4);
> cr = cairo_create(imageSurface);
> cairo_set_source_rgb(cr,1.0,0,1.0);
> cairo_rectangle(cr, 100.0,20.0,400.0,40.0 );
> cairo_fill(cr);
> 
> //gst_buffer_unmap (buffer, &info);
> 
> GST_BUFFER_PTS (buffer) = timestamp;
> GST_BUFFER_DURATION (buffer) = gst_util_uint64_scale_int (1, GST_SECOND, 2);
> 
> timestamp += GST_BUFFER_DURATION (buffer);
> 
> 
> g_signal_emit_by_name (appsrc, "push-buffer", buffer, &ret);
> 
> 
> if (ret != GST_FLOW_OK) {
>   /* something wrong, stop pushing */
>   g_main_loop_quit (loop);
> }
> }
> 
> gint
> main (gint   argc,
>     gchar *argv[])
> {
> GstElement *pipeline, *appsrc, *conv, *videosink;
> 
> /* init GStreamer */
> gst_init (&argc, &argv);
> loop = g_main_loop_new (NULL, FALSE);
> 
> /* setup pipeline */
> pipeline = gst_pipeline_new ("pipeline");
> appsrc = gst_element_factory_make ("appsrc", "source");
> conv = gst_element_factory_make ("videoconvert", "conv");
> videosink = gst_element_factory_make ("ximagesink", "videosink");
> 
> /* setup */
> g_object_set (G_OBJECT (appsrc), "caps",
>         gst_caps_new_simple ("video/x-raw",
>                    "format", G_TYPE_STRING, "ARGB",
>                    "width", G_TYPE_INT, 640,
>                    "height", G_TYPE_INT, 50,
>                    "framerate", GST_TYPE_FRACTION, 15, 1,
>                    NULL), NULL);
> gst_bin_add_many (GST_BIN (pipeline), appsrc, conv, videosink, NULL);
> gst_element_link_many (appsrc, conv, videosink, NULL);
> 
> /* setup appsrc */
> g_object_set (G_OBJECT (appsrc),
>       "stream-type", 0,
>       "format", GST_FORMAT_TIME, NULL);
> g_signal_connect (appsrc, "need-data", G_CALLBACK (cb_need_data), NULL);
> 
> /* play */
> gst_element_set_state (pipeline, GST_STATE_PLAYING);
> g_main_loop_run (loop);
> 
> /* clean up */
> gst_element_set_state (pipeline, GST_STATE_NULL);
> gst_object_unref (GST_OBJECT (pipeline));
> g_main_loop_unref (loop);
> 
> return 0;
> }
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