Alvin Delagon

/*
 * File: mp3player.c
 * Author: Alvin Delagon
 * Summary: A command-line mp3 player using gstreamer
 */

#include <gst/gst.h>

int main (int argc, char *argv[])
{
  GstElement *pipeline;
  GstElement *filesrc, *mad, *audioconvert, *alsasink;

  /* initialize gst */
  const gchar *nano_str;
  guint major, minor, micro, nano;
  gst_version (&major, &minor, &micro, &nano);
  if (nano == 1)
    nano_str = "(CVS)";
  else if (nano == 2)
    nano_str = "(Prerelease)";
  else
    nano_str = "";
  g_print ("Using gstreamer version: %d.%d.%d %s\n", major, minor, micro, nano_str);
  gst_init (&argc, &argv);

  g_print ("Creating elements...\n");
  /* Create Elements */
  filesrc = gst_element_factory_make ("filesrc", "source");
  if (filesrc == NULL)
    {
      g_print ("Failed to create filesrc element");
      return -1;
    }
  mad = gst_element_factory_make ("mad", "decoder");
  if (mad == NULL)
    {
      g_print ("Failed to create mad element");
      return -1;
    }
  audioconvert = gst_element_factory_make ("audioconvert", "converter");
  if (audioconvert == NULL)
    {
      g_print ("Failed to create audioconvert element");
      return -1;
    }
  alsasink = gst_element_factory_make ("alsasink", "sink");
  if (alsasink == NULL)
    {
      g_print ("Failed to create alsasink element");
      return -1;
    }

  g_print ("Building pipeline...\n");
  /* Add Elements to pipeline*/
  pipeline = gst_pipeline_new ("mp3-pipeline");
  gst_bin_add_many (GST_BIN (pipeline), filesrc, mad, audioconvert, alsasink, NULL);

  g_print ("Linking elements...\n");
  /* Link Elements */
  if (!gst_element_link_many (filesrc, mad, audioconvert, alsasink, NULL))
    g_warning ("Failed to link elements!\n");

  /* Set filesrc location property */
  if (argv[1] == NULL)
    {
      g_print ("mp3 file is not provided. usage: mp3player [file]\n");
      return -1;
    }
  g_print ("Playing file: %s\n", argv[1]);
  g_object_set (filesrc, "location", argv[1], NULL);


  /* Set pipeline state to PLAYING */
  gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);

  /* Application loop (We'll use gtk_main() here soon) */
  while (1)
    {
      g_usleep(G_USEC_PER_SEC);
      g_print (".");
    }

  return 0;
}