mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-23 16:50:47 +00:00
Code Issues 1 Projects Releases Wiki Activity

examples: update hello world example

Browse source 
Our helloworld example thatw e reference from the manual has been a bit
complicated to serve a first contact with gstreamer. Since we have and
promote playbin2 as a playback api use it here.

Based on work from Mathias Hasselmann <mathias.hasselmann@gmx.de>

Fixes #424143
This commit is contained in:
Stefan Kost 2011-03-07 16:21:47 +02:00
parent 0e6aa69366
commit eb05020f58
1 changed files with 58 additions and 93 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

143
tests/examples/helloworld/helloworld.c
View file

@ -1,115 +1,80 @@
#include <stdlib.h>
#include <gst/gst.h> #include <gst/gst.h>
static void static gboolean
event_loop (GstElement * pipe) bus_call (GstBus * bus, GstMessage * msg, gpointer data)
{ {
GstBus *bus; GMainLoop *loop = (GMainLoop *) data;
GstMessage *message = NULL;
gboolean running = TRUE;
bus = gst_element_get_bus (GST_ELEMENT (pipe)); switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_EOS:{
while (running) { g_print ("End-of-stream\n");
message = gst_bus_poll (bus, GST_MESSAGE_ANY, -1); g_main_loop_quit (loop);
g_assert (message != NULL);
switch (message->type) {
case GST_MESSAGE_EOS:
running = FALSE;
break;
case GST_MESSAGE_WARNING:{
GError *gerror;
gchar *debug;
gst_message_parse_warning (message, &gerror, &debug);
gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
g_error_free (gerror);
g_free (debug);
break; break;
} }
case GST_MESSAGE_ERROR:{ case GST_MESSAGE_ERROR:{
GError *gerror;
gchar *debug; gchar *debug;
GError *err;
gst_message_parse_error (message, &gerror, &debug); gst_message_parse_error (msg, &err, &debug);
gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
g_error_free (gerror);
g_free (debug); g_free (debug);
running = FALSE;
g_print ("Error: %s\n", err->message);
g_error_free (err);
g_main_loop_quit (loop);
break; break;
} }
default: default:
break; break;
} }
gst_message_unref (message); return TRUE;
}
gst_object_unref (bus);
} }
int gint
main (int argc, char *argv[]) main (gint argc, gchar * argv[])
{ {
GstElement *bin, *filesrc, *decoder, *audiosink; GstElement *playbin;
GstElement *conv, *resample; GMainLoop *loop;
GstBus *bus;
gchar *uri;
gst_init (&argc, &argv); gst_init (&argc, &argv);
if (argc != 2) { if (argc < 2) {
g_print ("usage: %s <mp3 file>\n", argv[0]); g_print ("usage: %s <media file or uri>\n", argv[0]);
exit (-1); return 1;
} }
/* create a new bin to hold the elements */ playbin = gst_element_factory_make ("playbin2", NULL);
bin = gst_pipeline_new ("pipeline"); if (!playbin) {
g_assert (bin); g_print ("'playbin2' gstreamer plugin missing\n");
return 1;
/* create a disk reader */
filesrc = gst_element_factory_make ("filesrc", "disk_source");
g_assert (filesrc);
g_object_set (G_OBJECT (filesrc), "location", argv[1], NULL);
/* now it's time to get the decoder */
decoder = gst_element_factory_make ("mad", "decode");
if (!decoder) {
g_print ("could not find plugin \"mad\"");
return -1;
} }
/* also, we need to add some converters to make sure the audio stream /* take the commandline argument and ensure that it is a uri */
* from the decoder is converted into a format the audio sink can if (gst_uri_is_valid (argv[1]))
* understand (if necessary) */ uri = g_strdup (argv[1]);
conv = gst_element_factory_make ("audioconvert", "audioconvert"); else
if (!conv) { uri = gst_filename_to_uri (argv[1], NULL);
g_print ("could not create \"audioconvert\" element!"); g_object_set (playbin, "uri", uri, NULL);
return -1; g_free (uri);
}
resample = gst_element_factory_make ("audioresample", "audioresample"); /* create and event loop and feed gstreamer bus mesages to it */
if (!resample) { loop = g_main_loop_new (NULL, FALSE);
g_print ("could not create \"audioresample\" element!");
return -1; bus = gst_element_get_bus (playbin);
} gst_bus_add_watch (bus, bus_call, loop);
g_object_unref (bus);
/* and an audio sink */
audiosink = gst_element_factory_make ("alsasink", "play_audio"); /* start play back and listed to events */
g_assert (audiosink); gst_element_set_state (playbin, GST_STATE_PLAYING);
g_main_loop_run (loop);
/* add objects to the main pipeline */
gst_bin_add_many (GST_BIN (bin), filesrc, decoder, conv, /* cleanup */
resample, audiosink, NULL); gst_element_set_state (playbin, GST_STATE_NULL);
g_object_unref (playbin);
/* link the elements */ g_object_unref (loop);
gst_element_link_many (filesrc, decoder, conv, resample, audiosink, NULL);
return 0;
/* start playing */
gst_element_set_state (bin, GST_STATE_PLAYING);
/* Run event loop listening for bus messages until EOS or ERROR */
event_loop (bin);
/* stop the bin */
gst_element_set_state (bin, GST_STATE_NULL);
exit (0);
} }