gstreamer/examples/helloworld/helloworld.c

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#include <stdlib.h>
#include <gst/gst.h>
gboolean playing;
/* eos will be called when the src element has an end of stream */
void eos(GstElement *element)
{
g_print("have eos, quitting\n");
playing = FALSE;
}
int main(int argc,char *argv[])
{
GstElement *bin, *disksrc, *parse, *decoder, *downmix, *mulaw, *mulawdec, *osssink;
gst_init(&argc,&argv);
if (argc != 2) {
g_print("usage: %s <filename>\n", argv[0]);
exit(-1);
}
/* create a new bin to hold the elements */
bin = gst_bin_new("bin");
/* create a disk reader */
disksrc = gst_elementfactory_make("disksrc", "disk_source");
gtk_object_set(GTK_OBJECT(disksrc),"location", argv[1],NULL);
gtk_signal_connect(GTK_OBJECT(disksrc),"eos",
GTK_SIGNAL_FUNC(eos),NULL);
/* now it's time to get the parser */
parse = gst_elementfactory_make("mp3parse","parse");
decoder = gst_elementfactory_make("mpg123","decoder");
downmix = gst_elementfactory_make("stereo2mono","stereo2mono");
mulaw = gst_elementfactory_make("mulawencode","mulaw");
mulawdec = gst_elementfactory_make("mulawdecode","mulawdec");
/* and an audio sink */
osssink = gst_elementfactory_make("osssink", "play_audio");
/* add objects to the main pipeline */
gst_bin_add(GST_BIN(bin), disksrc);
gst_bin_add(GST_BIN(bin), parse);
gst_bin_add(GST_BIN(bin), decoder);
gst_bin_add(GST_BIN(bin), downmix);
gst_bin_add(GST_BIN(bin), mulaw);
gst_bin_add(GST_BIN(bin), mulawdec);
gst_bin_add(GST_BIN(bin), osssink);
/* connect src to sink */
gst_pad_connect(gst_element_get_pad(disksrc,"src"),
gst_element_get_pad(parse,"sink"));
gst_pad_connect(gst_element_get_pad(parse,"src"),
gst_element_get_pad(decoder,"sink"));
gst_pad_connect(gst_element_get_pad(decoder,"src"),
gst_element_get_pad(downmix,"sink"));
gst_pad_connect(gst_element_get_pad(downmix,"src"),
gst_element_get_pad(mulaw,"sink"));
gst_pad_connect(gst_element_get_pad(mulaw,"src"),
gst_element_get_pad(mulawdec,"sink"));
gst_pad_connect(gst_element_get_pad(mulawdec,"src"),
gst_element_get_pad(osssink,"sink"));
/* start playing */
gst_element_set_state(bin, GST_STATE_PLAYING);
playing = TRUE;
while (playing) {
gst_bin_iterate(GST_BIN(bin));
}
/* stop the bin */
gst_element_set_state(bin, GST_STATE_NULL);
gst_object_destroy(GST_OBJECT(osssink));
gst_object_destroy(GST_OBJECT(parse));
gst_object_destroy(GST_OBJECT(decoder));
gst_object_destroy(GST_OBJECT(downmix));
gst_object_destroy(GST_OBJECT(mulaw));
gst_object_destroy(GST_OBJECT(mulawdec));
gst_object_destroy(GST_OBJECT(disksrc));
gst_object_destroy(GST_OBJECT(bin));
exit(0);
}