stream opencv images via gsteamer

[bertl]

Hello,
i have an example code to read data from an opencv image, but it doesn work.
The compiler says

"ERROR from element mysource: Interner Fehler im Datenfluss.
Debugging info: gstbasesrc.c(2625): gst_base_src_loop ():
/GstPipeline:pipeline0/GstAppSrc:mysource:
streaming task paused, reason not-negotiated (-4)"

can anyone help?



#include <stdio.h>
#include <stdlib.h>
#include <gst/gst.h>
#include <glib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <iostream>
#include <opencv2/opencv.hpp>
#include <gst/app/gstappsrc.h>
#include <boost/thread.hpp>


using namespace std;
using namespace cv;
using namespace boost;


typedef struct _App App;
struct _App{
    GstElement *pipeline;
    GstElement *appsrc;

    GMainLoop *loop;
    guint sourceid;
    GTimer *timer;
};

App s_app;
CvCapture *capture;
static gboolean read_data(App *app){
    GstFlowReturn ret;
    GstBuffer *buffer = gst_buffer_new();
    IplImage* frame = cvQueryFrame(capture);
    //cvWaitKey(30);
    GST_BUFFER_DATA(buffer) = (guint8*)frame->imageData;
    GST_BUFFER_SIZE(buffer) = frame->width*frame->height*sizeof(uchar*);
    g_signal_emit_by_name(app->appsrc,"push-buffer",buffer,&ret);
    gst_buffer_unref(buffer);
    if(ret != GST_FLOW_OK){
        GST_DEBUG("Error al alimentar buffer");
        return FALSE;
    }
    return TRUE;
 }

static void start_feed(GstElement* pipeline,guint size, App* app){
    if(app->sourceid == 0){
        GST_DEBUG("Alimentando");
        app->sourceid = g_idle_add((GSourceFunc) read_data, app);
    }
 }

static void stop_feed(GstElement* pipeline, App* app){
    if(app->sourceid !=0 ){
        GST_DEBUG("Stop feeding");
        g_source_remove(app->sourceid);
        app->sourceid = 0;
    }
}

static gboolean bus_message (GstBus * bus, GstMessage * message, App * app)
{
   GST_DEBUG ("got message %s",
   gst_message_type_get_name (GST_MESSAGE_TYPE (message)));

  switch (GST_MESSAGE_TYPE (message)) {
    case GST_MESSAGE_ERROR: {
        GError *err = NULL;
        gchar *dbg_info = NULL;
        gst_message_parse_error (message, &err, &dbg_info);
        g_printerr ("ERROR from element %s: %s\n",
            GST_OBJECT_NAME (message->src), err->message);
        g_printerr ("Debugging info: %s\n", (dbg_info) ? dbg_info : "none");
        g_error_free (err);
        g_free (dbg_info);
        g_main_loop_quit (app->loop);
        break;
    }
    case GST_MESSAGE_EOS:
      g_main_loop_quit (app->loop);
      break;
   default:
      break;
  }
  return TRUE;
}

int main(int argc, char* argv[]){
    App *app = &s_app;
    //GError *error = NULL;
    GstBus *bus;
    GstCaps *caps;
    capture = cvCaptureFromCAM(0);
    gst_init(&argc,&argv);
     //create a mainloop to get messages and to handle the idle handler that
will
     //* feed data to appsrc.

    app->loop = g_main_loop_new (NULL, TRUE);
    app->timer = g_timer_new();

    app->pipeline = gst_parse_launch("appsrc name=mysource !
video/x-raw-rgb,width=640,height=480 ! ffmpegcolorspace ! videoscale
method=1 ! theoraenc bitrate=150 ! tcpserversink host=127.0.0.1 port=5000",
NULL);
    g_assert (app->pipeline);
    bus = gst_pipeline_get_bus (GST_PIPELINE (app->pipeline));
    g_assert(bus);
     //add watch for messages
    gst_bus_add_watch (bus, (GstBusFunc) bus_message, app);
    //get the appsrc

    app->appsrc = gst_bin_get_by_name(GST_BIN(app->pipeline),"mysource");
    g_assert(app->appsrc);
    g_assert(GST_IS_APP_SRC(app->appsrc));
    g_signal_connect (app->appsrc, "need-data", G_CALLBACK (start_feed),
app);
    g_signal_connect (app->appsrc, "enough-data", G_CALLBACK (stop_feed),
app);

   //  set the caps on the source
   caps = gst_caps_new_simple ("video/x-raw-rgb",
     "width", G_TYPE_INT, 640,
     "height", G_TYPE_INT, 480,
     NULL);
   gst_app_src_set_caps(GST_APP_SRC(app->appsrc), caps);
  // go to playing and wait in a mainloop.
  gst_element_set_state(app->pipeline, GST_STATE_PLAYING);

   // this mainloop is stopped when we receive an error or EOS
   g_main_loop_run (app->loop);
   GST_DEBUG ("stopping");
  gst_element_set_state(app->pipeline, GST_STATE_NULL);
   gst_object_unref(bus);
   g_main_loop_unref(app->loop);
   cvReleaseCapture(&capture);
 return 0;
 }



--
View this message in context: http://gstreamer-devel.966125.n4.nabble.com/stream-opencv-images-via-gsteamer-tp4659001.html
Sent from the GStreamer-devel mailing list archive at Nabble.com.