has anyone used the gstreamer libraries with c++ builder?

[DanW 0]

I tried and get errors when linking the .a

 

Thanks

Dan

[Roger Cigol 103]

Out of interest, which C++ compiler are you using (classic (32), clang32 or clang64) ?

[DanW 0]

The 64 bit compiler.

[Lars Fosdal 1792]

It is useful to post the actual errors for others to be able to think about the cause.

 

[DanW 0]

when I use the mingw version of gstreamer I see

 

ilink64 command line
  c:\program files (x86)\embarcadero\studio\21.0\bin\ilink64.exe -G8 -L.\Win64\Debug;"c:\program files (x86)\embarcadero\studio\21.0\lib\Win64\debug";
  "c:\program files (x86)\embarcadero\studio\21.0\lib\win64\release";"c:\program files (x86)\embarcadero\studio\21.0\lib\win64\release\psdk";
  C:\Users\Public\Documents\Embarcadero\Studio\21.0\Dcp\Win64;C:\gstreamer\1.0\mingw_x86_64\lib;"C:\gstreamer\1.0\mingw_x86_64\lib\gstreamer-1.0";
  C:\Users\Public\Documents\Embarcadero\Studio\21.0\DCP\Win64\Debug;C:\Users\Public\Documents\Embarcadero\Studio\21.0\Dcp\Win64 -j.\Win64\Debug;
  "c:\program files (x86)\embarcadero\studio\21.0\lib\Win64\debug";"c:\program files (x86)\embarcadero\studio\21.0\lib\win64\release";"c:\program files 
  (x86)\embarcadero\studio\21.0\lib\win64\release\psdk";C:\Users\Public\Documents\Embarcadero\Studio\21.0\Dcp\Win64;C:\gstreamer\1.0\mingw_x86_64\lib;
  "C:\gstreamer\1.0\mingw_x86_64\lib\gstreamer-1.0";C:\Users\Public\Documents\Embarcadero\Studio\21.0\DCP\Win64\Debug;
  C:\Users\Public\Documents\Embarcadero\Studio\21.0\Dcp\Win64 -l.\Win64\Debug -v -Gn 
  -GA"C:\Users\DWinsor\AppData\Local\Temp\vfsE889.tmp"="F:\Users\dwinsor\Documents\Embarcadero\Studio\Projects\test2\Unit1.dfm" -aa -V5.0 -Tpe c0w64w 
  rtl.bpi vcl.bpi memmgr.a sysinit.o .\Win64\Debug\Project1.o .\Win64\Debug\Unit1.o , .\Win64\Debug\Project1.exe , .\Win64\Debug\Project1.map , 
  import64.a cp64mti.a , , Project1.res 
[ilink64 Error] Fatal: Invalid object file 'asnprintf.c.obj'

 

 

 

[DanW 0]

Unit1 source:

 

 

#include <vcl.h>
#pragma hdrstop

#include <gst/gst.h>
#include <string.h>

#include "Unit1.h"

#pragma link "libgstreamer-1.0.a"

typedef struct _CustomData {
  gboolean is_live;
  GstElement *pipeline;
  GMainLoop *loop;
} CustomData;

static void cb_message (GstBus *bus, GstMessage *msg, CustomData *data)
{

  switch (GST_MESSAGE_TYPE (msg)) {
    case GST_MESSAGE_ERROR: {
      GError *err;
      gchar *debug;

      gst_message_parse_error (msg, &err, &debug);
      g_print ("Error: %s\n", err->message);
      g_error_free (err);
      g_free (debug);

      gst_element_set_state (data->pipeline, GST_STATE_READY);
      g_main_loop_quit (data->loop);
      break;
    }
    case GST_MESSAGE_EOS:
      /* end-of-stream */
      gst_element_set_state (data->pipeline, GST_STATE_READY);
      g_main_loop_quit (data->loop);
      break;
    case GST_MESSAGE_BUFFERING: {
      gint percent = 0;

      /* If the stream is live, we do not care about buffering. */
      if (data->is_live) break;

      gst_message_parse_buffering (msg, &percent);
      g_print ("Buffering (%3d%%)\r", percent);
      /* Wait until buffering is complete before start/resume playing */
      if (percent < 100)
        gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
      else
        gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
      break;
    }
    case GST_MESSAGE_CLOCK_LOST:
      /* Get a new clock */
      gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
      gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
      break;
    default:
      /* Unhandled message */
      break;
    }

}

//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
  GstElement *pipeline;
  GstBus *bus;
  GstStateChangeReturn ret;
  GMainLoop *main_loop;
  CustomData data;

  /* Initialize GStreamer */
  gst_init (0, 0);

  /* Initialize our data structure */
  memset (&data, 0, sizeof (data));

  /* Build the pipeline */
  pipeline = gst_parse_launch ("playbin uri=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm", NULL);
  bus = gst_element_get_bus (pipeline);

  /* Start playing */
  ret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
  if (ret == GST_STATE_CHANGE_FAILURE) {
    g_printerr ("Unable to set the pipeline to the playing state.\n");
    gst_object_unref (pipeline);
    return;
  } else if (ret == GST_STATE_CHANGE_NO_PREROLL) {
    data.is_live = TRUE;
  }

  main_loop = g_main_loop_new (NULL, FALSE);
  data.loop = main_loop;
  data.pipeline = pipeline;

  gst_bus_add_signal_watch (bus);
  g_signal_connect (bus, "message", G_CALLBACK (cb_message), &data);

  g_main_loop_run (main_loop);

  /* Free resources */
  g_main_loop_unref (main_loop);
  gst_object_unref (bus);
  gst_element_set_state (pipeline, GST_STATE_NULL);
  gst_object_unref (pipeline);
}
//---------------------------------------------------------------------------
 

[DanW 0]

Here's the whole project:

test2.zip

[DanW 0]

When I use the MSVC version of gstreamer I get:

[ilink64 Error] Fatal: Invalid object file '/0'

 

[DanW 0]

nobody has any idea how to compile the gstreamer libs or use the existing ones?

[Rolf Fankhauser 1]

Did you try to generate import libraries with mkexp?