Question

我一直收到这个错误：

$ ./test recit24bit.flac 
Now playing: recit24bit.flac
Running...
Error: Internal data flow error.
Returned, stopping playback
Deleting pipeline

编译此代码时：

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

static gboolean bus_call (GstBus *bus,
                          GstMessage *msg,
                          gpointer data)

{
  GMainLoop *loop = (GMainLoop *) data;

  switch (GST_MESSAGE_TYPE (msg))
  {
    case GST_MESSAGE_EOS:
    {
      g_print ("End of stream\n");
      g_main_loop_quit (loop);
      break;
    }
    case GST_MESSAGE_ERROR:
    {
      gchar *debug;
      GError *error;

      gst_message_parse_error (msg, &error, &debug);
      g_free (debug);

      g_printerr ("Error: %s\n", error->message);
      g_error_free (error);

      g_main_loop_quit (loop);
      break;
    }
    default:
    {
      break;
    }
  }

  return TRUE;
}



/*
static void on_pad_added (GstElement *element,
                          GstPad *pad, 
                          gpointer data)
{
  GstPad *sinkpad;
  GstElement *decoder = (GstElement *) data;


  // We can now link this pad with the vorbis-decoder sink pad 
  g_print ("Dynamic pad created, linking demuxer/decoder\n");
  sinkpad = gst_element_get_static_pad (decoder, "sink");
  gst_pad_link (pad, sinkpad);
  gst_object_unref (sinkpad);
}
*/



int main (int argc,
          char *argv[])
{
  GMainLoop *loop;

  GstElement *pipeline,
             *source,
             //*demuxer, 
             *decoder,
             *conv,
             *sink;

  GstBus *bus;


  guint bus_watch_id;


  /* Initialisation */
  gst_init (&argc, &argv);

  loop = g_main_loop_new (NULL, FALSE);

  /* Check input arguments */
  if (argc != 2)
  {
    g_printerr ("Usage: %s <Flac filename>\n", argv[0]);
    return -1;
  }

  /* Create gstreamer elements */
  pipeline = gst_pipeline_new ("audio-player");
  source   = gst_element_factory_make ("filesrc",       "file-source");
  //demuxer  = gst_element_factory_make ("oggdemux",      "ogg-demuxer");
  decoder  = gst_element_factory_make ("flacdec",     "flac-decoder");
  conv     = gst_element_factory_make ("audioconvert",  "converter");
  sink     = gst_element_factory_make ("alsasink", "audio-output");


  if (!pipeline || !source ||/* !demuxer ||*/ !decoder ||/* !conv ||*/ !sink)
  {
    g_printerr ("One element could not be created. Exiting.\n");
    return -1;
  }


  /* Set up the pipeline */
  /* we set the input filename to the source element */
  g_object_set (G_OBJECT (source), "location", argv[1], NULL);

  /* we add a message handler */
  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
  bus_watch_id = gst_bus_add_watch (bus, bus_call, loop);
  gst_object_unref (bus);

  /* we add all elements into the pipeline */
  /* file-source | ogg-demuxer | vorbis-decoder | converter | alsa-output */
  gst_bin_add_many (GST_BIN (pipeline), source,/* demuxer,*/ decoder, conv, sink, NULL);


  /* we link the elements together */
  /* file-source -> ogg-demuxer ~> vorbis-decoder -> converter -> alsa-output */
  //gst_element_link (source, demuxer);
  gst_element_link_many (source, decoder, conv, sink, NULL);

//  g_signal_connect (demuxer, "pad-added", G_CALLBACK (on_pad_added), decoder);
  /* note that the demuxer will be linked to the decoder dynamically.
  The reason is that Ogg may contain various streams (for example
  audio and video). The source pad(s) will be created at run time,
  by the demuxer when it detects the amount and nature of streams.
  Therefore we connect a callback function which will be executed
  when the "pad-added" is emitted.*/

  /* Set the pipeline to "playing" state*/
  g_print ("Now playing: %s\n", argv[1]);
  gst_element_set_state (pipeline, GST_STATE_PLAYING);

  /* Iterate */
  g_print ("Running...\n");
  g_main_loop_run (loop);


  /* Out of the main loop, clean up nicely */
  g_print ("Returned, stopping playback\n");



  gst_element_set_state (pipeline, GST_STATE_NULL);
  g_print ("Deleting pipeline\n");

  gst_object_unref (GST_OBJECT (pipeline));
  g_source_remove (bus_watch_id);
  g_main_loop_unref (loop);

  return 0;

我正在使用它来成功编译它：

g++ -Wall test-flac.cc -o test $(pkg-config --cflags --libs gstreamer-1.0)

我正在使用Arch，如果这意味着什么。有人有什么建议吗？我是一个非常大的菜鸟，但我不明白我做得不对，因为它似乎应该有用。

Answer 1

我只需要用解析器替换解复用器，这显然是必要的。 DERP。我当然使用了flacparse。

Gstreamer FLAC管道创建错误

1 个答案: