<div dir="ltr">Hello all,<div> </div><div>I am extremely new to gstreamer.</div><div> </div><div>I am trying to read frame data for a live streaming video through gstreamer in C to create an opengl texture.</div><div> </div><div>Currently going through online repositories and tutorials I could come up code below, which is still not working. I was hoping if somebody could point me in the right direction or point out errors in code or errors in the approach I am using. Any help would be appreciated. </div><div> </div><div>The code below is not creating texture. I am just accessing frame data on line 21 as a first milestone.</div><div>Code lines which I feel are important to approach are marked as bold.</div><div><ol><li>#include <gst/gst.h></li><li>#include <string.h></li><li>#include <stdio.h></li><li> </li><li>typedef struct _CustomData {</li><li> GstElement *pipeline,*sink,*bin;</li><li> GstPad *pad,*ghost_pad;</li><li> GstBus *bus;</li><li> GstMessage *msg;</li><li> GMainLoop *loop; </li><li> gboolean is_live;</li><li>} CustomData;</li><li> </li><li>//signal handling function</li><li>void frame_func(GstElement *sink, CustomData *data){</li><li> printf("frame signal\n");</li><li> GstSample *sample;</li><li> GstBuffer *buf;</li><li> g_signal_emit_by_name(sink,"pull_sample",&sample);</li><li> buf=gst_sample_get_buffer(sample);</li><li> printf("%c\n",buf[0]) </li><li> if(sample){</li><li> gst_sample_unref(sample);</li><li> }</li><li>}</li><li> </li><li>int main(int argc, char *argv[]) {</li><li> GstElement *pipeline,*sink;</li><li> GstBus *bus;</li><li> GMainLoop *main_loop;</li><li> GstStateChangeReturn ret;</li><li> CustomData data;</li><li> </li><li>//initialize</li><li> gst_init (&argc, &argv);</li><li> memset (&data, 0, sizeof (data));</li><li> </li><li>//setup pipeline</li><li> pipeline = gst_parse_launch ("uridecodebin uri=rtsp://<a href="http://192.168.1.221/stream2.sdp">192.168.1.221/stream2.sdp</a>! decodebin ! appsink name=video-sink caps=\"video/x-raw,format=RGB,pixel-aspect-ratio=1/1\"", NULL);</li><li> </li><li> //access sink to create signal</li><li> sink=gst_bin_get_by_name(GST_BIN(pipeline),"video-sink");</li><li> </li><li>//setting video to play</li><li> ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);</li><li> if (ret == GST_STATE_CHANGE_FAILURE) {</li><li> g_printerr ("Unable to set the pipeline to the playing state.\n");</li><li> gst_object_unref (pipeline);</li><li> return -1;</li><li> } else{</li><li> if (ret == GST_STATE_CHANGE_NO_PREROLL)</li><li> printf("for live sources, state changed but data could not be produced\n");</li><li> else if (ret == GST_STATE_CHANGE_ASYNC)</li><li> printf("state will change async\n");</li><li> else if (ret == GST_STATE_CHANGE_SUCCESS)</li><li> printf("successfully played\n");</li><li> else</li><li> printf("unknown %d\n",ret);</li><li> data.is_live=TRUE;</li><li> }</li><li> bus = gst_element_get_bus (pipeline);</li><li> </li><li>//setting up signals from sink</li><li> g_object_set(G_OBJECT(sink),"emit-signals",TRUE,NULL);</li><li> g_signal_connect (sink, "new-sample", G_CALLBACK(frame_func), &data);</li><li> </li><li>//setting up loop</li><li> main_loop = g_main_loop_new (NULL, FALSE);</li><li> data.loop = main_loop;</li><li> data.pipeline = pipeline;</li><li> data.sink = sink;</li><li> </li><li> g_main_loop_run (main_loop);</li><li> </li><li>//cleanup</li><li> if(msg!=NULL)</li><li> gst_message_unref(msg);</li><li> g_main_loop_unref (main_loop);</li><li> gst_object_unref (bus);</li><li> gst_element_set_state (pipeline, GST_STATE_NULL);</li><li> gst_object_unref (pipeline);</li><li> return 0;</li><li>}</li></ol></div></div>