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problem to seek mp3

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problem to seek mp3

Vincent Meserette
Hi all,

I am a newbie in the use of gstreamer, so I hope you will excuse the simplicity of my question.
I wrote a little program to play wav and mp3 files with the playbin element, and a function to seek on this element.
For wav files it works perfectly, but it doesn't seek on mp3 files, even if I haven't error message from the gst_element_seek function.
Does anyone know from where could come the problem ?

Here is the construction of my pipeline :

     gst_init (0, 0);
     GMainLoop *loop = g_main_loop_new (NULL, FALSE);
   
    // -------------- play with playbin --------------------
    GstElement *play = gst_element_factory_make ("playbin", "play");
    std::string uri="file:///"+pFileName;
    std::cout << "playing " << uri <<  std::endl;
    g_object_set (G_OBJECT (play), "uri", uri.c_str(), NULL);

    GstElement *sink = gst_element_factory_make ("alsasink","sink");
    g_object_set (G_OBJECT (play),"audio-sink", sink, NULL);
 
    GstBus*bus = gst_pipeline_get_bus (GST_PIPELINE (play));
    gst_bus_add_watch (bus, (GstBusFunc) bus_call, thisApp);
    gst_bus_add_signal_watch (bus);
    gst_object_unref (GST_OBJECT (bus));
    gst_element_set_state (play, GST_STATE_PLAYING);
    g_main_loop_run (loop);

And here the seeking function :


void GstPlayer::goToPosition(const float &position)
{
  gint64 fpos=position*GST_SECOND;
  GstQuery *query;
  if (!play)
  {
    std::cout << "play is not construct "<< std::endl ;
    return;
  }
  /**
  * Determine whether we can seek.
  **/
  query = gst_query_new_seeking (GST_FORMAT_TIME);
  while (!gst_element_query (play, query))
  {
    std::cout << "not OK to seek"<< std::endl ;
  }

  GstState state, pending;

  /**
    * Store old state.
    **/
  gst_element_get_state ( play,
                          &state,
                          &pending,
                          0);
  if (pending)
          state = pending;

  /**
    * State to PAUSED.
    **/
  gst_element_set_state (play, GST_STATE_PAUSED);
 
  /**
    * Perform the seek.
    **/
  std::cout << "seeking to " << position << " s" <<  std::endl;
  gst_element_seek (play,
                    1.0,
                    GST_FORMAT_TIME,
                    GST_SEEK_FLAG_FLUSH,
                    GST_SEEK_TYPE_SET,
                    fpos,
                    GST_SEEK_TYPE_NONE, 0);
  /**
    * Restore state.
    **/
  gst_element_set_state (play, state);

Thanks in advance

Vincent
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Re: problem to seek mp3

Jyoti-2
may be you should check the return value of

gst_element_seek (play,
                   1.0,
                   GST_FORMAT_TIME,
                   GST_SEEK_FLAG_FLUSH,
                   GST_SEEK_TYPE_SET,
                   fpos,
                   GST_SEEK_TYPE_NONE, 0);

only if its true means the seeking is possible else not.


On Wed, Nov 4, 2009 at 10:37 PM, vincent meserette <[hidden email]> wrote:

Hi all,

I am a newbie in the use of gstreamer, so I hope you will excuse the
simplicity of my question.
I wrote a little program to play wav and mp3 files with the playbin element,
and a function to seek on this element.
For wav files it works perfectly, but it doesn't seek on mp3 files, even if
I haven't error message from the gst_element_seek function.
Does anyone know from where could come the problem ?

Here is the construction of my pipeline :

    gst_init (0, 0);
    GMainLoop *loop = g_main_loop_new (NULL, FALSE);

   // -------------- play with playbin --------------------
   GstElement *play = gst_element_factory_make ("playbin", "play");
   std::string uri="file:///"+pFileName;
   std::cout << "playing " << uri <<  std::endl;
   g_object_set (G_OBJECT (play), "uri", uri.c_str(), NULL);

   GstElement *sink = gst_element_factory_make ("alsasink","sink");
   g_object_set (G_OBJECT (play),"audio-sink", sink, NULL);

   GstBus*bus = gst_pipeline_get_bus (GST_PIPELINE (play));
   gst_bus_add_watch (bus, (GstBusFunc) bus_call, thisApp);
   gst_bus_add_signal_watch (bus);
   gst_object_unref (GST_OBJECT (bus));
   gst_element_set_state (play, GST_STATE_PLAYING);
   g_main_loop_run (loop);

And here the seeking function :


void GstPlayer::goToPosition(const float &position)
{
 gint64 fpos=position*GST_SECOND;
 GstQuery *query;
 if (!play)
 {
   std::cout << "play is not construct "<< std::endl ;
   return;
 }
 /**
 * Determine whether we can seek.
 **/
 query = gst_query_new_seeking (GST_FORMAT_TIME);
 while (!gst_element_query (play, query))
 {
   std::cout << "not OK to seek"<< std::endl ;
 }

 GstState state, pending;

 /**
   * Store old state.
   **/
 gst_element_get_state ( play,
                         &state,
                         &pending,
                         0);
 if (pending)
         state = pending;

 /**
   * State to PAUSED.
   **/
 gst_element_set_state (play, GST_STATE_PAUSED);

 /**
   * Perform the seek.
   **/
 std::cout << "seeking to " << position << " s" <<  std::endl;
 gst_element_seek (play,
                   1.0,
                   GST_FORMAT_TIME,
                   GST_SEEK_FLAG_FLUSH,
                   GST_SEEK_TYPE_SET,
                   fpos,
                   GST_SEEK_TYPE_NONE, 0);
 /**
   * Restore state.
   **/
 gst_element_set_state (play, state);

Thanks in advance

Vincent
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ray
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Re: problem to seek mp3

ray
I have the same problem with the gst_element_seek() API.
Does anyone know why the return value is false when seeking MP3?
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