| |
| /*** block from ../../../docs/manual/advanced-dataaccess.xml ***/ |
| #include <gst/gst.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; |
| guint size; |
| GstFlowReturn ret; |
| |
| size = 385 * 288 * 2; |
| |
| buffer = gst_buffer_new_allocate (NULL, size, NULL); |
| |
| /* this makes the image black/white */ |
| gst_buffer_memset (buffer, 0, white ? 0xff : 0x0, size); |
| |
| white = !white; |
| |
| 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 ("xvimagesink", "videosink"); |
| |
| /* setup */ |
| g_object_set (G_OBJECT (appsrc), "caps", |
| gst_caps_new_simple ("video/x-raw", |
| "format", G_TYPE_STRING, "RGB16", |
| "width", G_TYPE_INT, 384, |
| "height", G_TYPE_INT, 288, |
| "framerate", GST_TYPE_FRACTION, 0, 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; |
| } |