gst/playback/test.c: Example of a small audio/video player using decodebin.

Original commit message from CVS:
* gst/playback/test.c: (gen_video_element), (gen_audio_element),
(cb_newpad), (main):
Example of a small audio/video player using decodebin.

diff --git a/ChangeLog b/ChangeLog
index 2226e1e..b272f76 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2006-07-20  Wim Taymans  <wim@fluendo.com>
+
+       * gst/playback/test.c: (gen_video_element), (gen_audio_element),
+       (cb_newpad), (main):
+       Example of a small audio/video player using decodebin.
+
 2006-07-20  Stefan Kost  <ensonic@users.sf.net>
 
        * gst-libs/gst/riff/riff-ids.h:

diff --git a/gst/playback/test.c b/gst/playback/test.c
index 31df582..6344145 100644 (file)
--- a/gst/playback/test.c
+++ b/gst/playback/test.c
@@ -1,5 +1,6 @@
 /* GStreamer
  * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) <2006> Wim Taymans <wim@fluendo.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -21,12 +22,15 @@
 #endif
 #include <gst/gst.h>
 
+static GMainLoop *loop;
+
 static GstElement *
 gen_video_element ()
 {
   GstElement *element;
   GstElement *conv;
   GstElement *sink;
+  GstPad *pad;
 
   element = gst_bin_new ("vbin");
   conv = gst_element_factory_make ("ffmpegcolorspace", "conv");
@@ -36,8 +40,9 @@ gen_video_element ()
   gst_bin_add (GST_BIN (element), sink);
   gst_element_link_pads (conv, "src", sink, "sink");
 
-  gst_element_add_pad (element,
-      gst_ghost_pad_new ("sink", gst_element_get_pad (conv, "sink")));
+  pad = gst_element_get_pad (conv, "sink");
+  gst_element_add_pad (element, gst_ghost_pad_new ("sink", pad));
+  gst_object_unref (pad);
 
   return element;
 }
@@ -48,6 +53,7 @@ gen_audio_element ()
   GstElement *element;
   GstElement *conv;
   GstElement *sink;
+  GstPad *pad;
 
   element = gst_bin_new ("abin");
   conv = gst_element_factory_make ("audioconvert", "conv");
@@ -57,83 +63,129 @@ gen_audio_element ()
   gst_bin_add (GST_BIN (element), sink);
   gst_element_link_pads (conv, "src", sink, "sink");
 
-  gst_element_add_pad (element,
-      gst_ghost_pad_new ("sink", gst_element_get_pad (conv, "sink")));
+  pad = gst_element_get_pad (conv, "sink");
+  gst_element_add_pad (element, gst_ghost_pad_new ("sink", pad));
+  gst_object_unref (pad);
 
   return element;
 }
 
+static void
+cb_newpad (GstElement * decodebin, GstPad * pad, gboolean last, gpointer data)
+{
+  GstCaps *caps;
+  GstStructure *str;
+  GstPad *sinkpad;
+  GstElement *sink;
+  GstElement *pipeline;
+  const gchar *name;
+  GstStateChangeReturn ret;
+  GstPadLinkReturn lret;
+
+  /* check media type */
+  caps = gst_pad_get_caps (pad);
+  str = gst_caps_get_structure (caps, 0);
+
+  name = gst_structure_get_name (str);
+  g_print ("name: %s\n", name);
+
+  if (g_strrstr (name, "audio")) {
+    sink = gen_audio_element ();
+  } else if (g_strrstr (name, "video")) {
+    sink = gen_video_element ();
+  } else {
+    sink = NULL;
+  }
+  gst_caps_unref (caps);
+
+  if (sink) {
+    pipeline = GST_ELEMENT_CAST (data);
+
+    /* add new sink to the pipeline */
+    gst_bin_add (GST_BIN_CAST (pipeline), sink);
+
+    /* set the new sink tp PAUSED as well */
+    ret = gst_element_set_state (sink, GST_STATE_PAUSED);
+    if (ret == GST_STATE_CHANGE_FAILURE)
+      goto state_error;
+
+    /* get the ghostpad of the sink bin */
+    sinkpad = gst_element_get_pad (sink, "sink");
+
+    /* link'n'play */
+    lret = gst_pad_link (pad, sinkpad);
+    if (lret != GST_PAD_LINK_OK)
+      goto link_failed;
+
+    gst_object_unref (sinkpad);
+  }
+  return;
+
+  /* ERRORS */
+state_error:
+  {
+    gst_bin_remove (GST_BIN_CAST (pipeline), sink);
+    g_warning ("could not change state of new sink (%d)", ret);
+    return;
+  }
+link_failed:
+  {
+    g_warning ("could not link pad and sink (%d)", lret);
+    return;
+  }
+}
+
 gint
 main (gint argc, gchar * argv[])
 {
-  GstElement *player;
+  GstElement *pipeline, *filesrc, *decodebin;
   GstStateChangeReturn res;
-  gint streams;
-  GList *streaminfo;
-  GList *s;
 
   gst_init (&argc, &argv);
 
-  player = gst_element_factory_make ("playbin", "player");
-  g_assert (player);
+  pipeline = gst_pipeline_new ("pipeline");
+
+  filesrc = gst_element_factory_make ("filesrc", "filesrc");
+  g_assert (filesrc);
+  decodebin = gst_element_factory_make ("decodebin", "decodebin");
+  g_assert (decodebin);
+
+  g_signal_connect (G_OBJECT (decodebin), "new-decoded-pad",
+      G_CALLBACK (cb_newpad), pipeline);
 
-  g_object_set (G_OBJECT (player), "uri", argv[1], NULL);
+  gst_bin_add_many (GST_BIN (pipeline), filesrc, decodebin, NULL);
+  gst_element_link (filesrc, decodebin);
 
-  res = gst_element_set_state (player, GST_STATE_PAUSED);
-  if (res != GST_STATE_CHANGE_SUCCESS) {
+  if (argc < 2) {
+    g_print ("usage: %s <uri>\n", argv[0]);
+    exit (-1);
+  }
+  g_object_set (G_OBJECT (filesrc), "location", argv[1], NULL);
+
+  /* set to paused, decodebin will autoplug and signal new_pad callbacks */
+  res = gst_element_set_state (pipeline, GST_STATE_PAUSED);
+  if (res == GST_STATE_CHANGE_FAILURE) {
     g_print ("could not pause\n");
     return -1;
   }
-  /* get info about the stream */
-  g_print ("stream info:\n");
-  g_object_get (G_OBJECT (player), "nstreams", &streams, NULL);
-  g_print (" number of streams: %d\n", streams);
-  g_object_get (G_OBJECT (player), "stream-info", &streaminfo, NULL);
-
-  for (s = streaminfo; s; s = g_list_next (s)) {
-    GObject *obj = G_OBJECT (s->data);
-    int type;
-    GstPad *srcpad, *sinkpad;
-    GstElement *sink;
-    gboolean res;
-
-    g_object_get (obj, "type", &type, NULL);
-    g_print (" type: %d\n", type);
-    g_object_get (obj, "pad", &srcpad, NULL);
-    g_print (" pad: %p\n", srcpad);
-
-    if (type == 1) {
-      sink = gen_audio_element ();
-    } else if (type == 2) {
-      sink = gen_video_element ();
-    } else {
-      g_warning ("unknown stream found");
-      continue;
-    }
-
-    gst_bin_add (GST_BIN (player), sink);
-    sinkpad = gst_element_get_pad (sink, "sink");
-    res = gst_pad_link (srcpad, sinkpad);
-    if (!res) {
-      GstCaps *caps;
-      gchar *capsstr;
-
-      caps = gst_pad_get_caps (srcpad);
-      capsstr = gst_caps_to_string (caps);
-      g_warning ("could not link %s", capsstr);
-      g_free (capsstr);
-      gst_caps_unref (caps);
-    }
-    //g_signal_emit_by_name (G_OBJECT (player), "link_stream", obj, sinkpad);
+  /* wait for paused to complete */
+  res = gst_element_get_state (pipeline, NULL, NULL, GST_CLOCK_TIME_NONE);
+  if (res == GST_STATE_CHANGE_FAILURE) {
+    g_print ("could not pause\n");
+    return -1;
   }
 
-  /* set effects sinks */
-  res = gst_element_set_state (player, GST_STATE_PLAYING);
-  if (res != GST_STATE_CHANGE_SUCCESS) {
+  /* play, now all the sinks are added to the pipeline and are prerolled and
+   * ready to play. */
+  res = gst_element_set_state (pipeline, GST_STATE_PLAYING);
+  if (res == GST_STATE_CHANGE_FAILURE) {
     g_print ("could not play\n");
     return -1;
   }
-  //gst_main ();
+
+  /* go in the mainloop now */
+  loop = g_main_loop_new (NULL, TRUE);
+  g_main_loop_run (loop);
 
   return 0;
 }