6 /* example based on helloworld by thomas@apestaart.org
7 demonstrates the adder plugin and the volume envelope plugin
8 work in progress but do try it out */
10 /* eos will be called when the src element has an end of stream */
11 void eos(GstElement *element)
13 g_print("have eos, quitting\n");
18 int main(int argc,char *argv[])
20 GstElement *bin_in1, *bin_in2, *main_bin;
21 GstElement *disksrc1, *decoder1, *volenv1;
22 GstElement *disksrc2, *decoder2, *volenv2;
24 GstElement *audiosink;
26 GstPad *pad; /* to request pads for the adder */
28 gst_init(&argc,&argv);
31 g_print("usage: %s <filename1> <filename2>\n", argv[0]);
35 /* create input bins */
37 /* create bins to hold the input elements */
38 bin_in1 = gst_bin_new("bin");
39 bin_in2 = gst_bin_new("bin");
45 disksrc1 = gst_elementfactory_make("disksrc", "disk_source1");
46 gtk_object_set(GTK_OBJECT(disksrc1),"location", argv[1],NULL);
47 gtk_signal_connect(GTK_OBJECT(disksrc1),"eos",
48 GTK_SIGNAL_FUNC(eos),NULL);
49 decoder1 = gst_elementfactory_make("mad","decoder1");
50 volenv1 = gst_elementfactory_make("volenv", "volume1");
54 gst_bin_add(GST_BIN(bin_in1), disksrc1);
55 gst_bin_add(GST_BIN(bin_in1), decoder1);
56 gst_bin_add(GST_BIN(bin_in1), volenv1);
58 /* connect elements */
59 gst_pad_connect(gst_element_get_pad(disksrc1,"src"),
60 gst_element_get_pad(decoder1,"sink"));
61 gst_pad_connect(gst_element_get_pad(decoder1,"src"),
62 gst_element_get_pad(volenv1,"sink"));
65 gst_element_add_ghost_pad (bin_in1, gst_element_get_pad (volenv1, "src"), "channel1");
67 /* second input bin */
71 disksrc2 = gst_elementfactory_make("disksrc", "disk_source2");
72 gtk_object_set(GTK_OBJECT(disksrc2),"location", argv[2],NULL);
73 gtk_signal_connect(GTK_OBJECT(disksrc2),"eos",
74 GTK_SIGNAL_FUNC(eos),NULL);
75 decoder2 = gst_elementfactory_make("mad","decoder2");
76 volenv2 = gst_elementfactory_make("volenv", "volume2");
80 gst_bin_add(GST_BIN(bin_in2), disksrc2);
81 gst_bin_add(GST_BIN(bin_in2), decoder2);
82 gst_bin_add(GST_BIN(bin_in2), volenv2);
84 /* connect elements */
85 gst_pad_connect(gst_element_get_pad(disksrc2,"src"),
86 gst_element_get_pad(decoder2,"sink"));
87 gst_pad_connect(gst_element_get_pad(decoder2,"src"),
88 gst_element_get_pad(volenv2,"sink"));
91 gst_element_add_ghost_pad (bin_in2, gst_element_get_pad (volenv2, "src"), "channel2");
95 adder = gst_elementfactory_make("adder", "adderel");
97 /* create an audio sink */
98 audiosink = gst_elementfactory_make("esdsink", "play_audio");
100 /* now create main bin */
101 main_bin = gst_bin_new("bin");
103 gst_bin_add(GST_BIN(main_bin), bin_in1);
104 gst_bin_add(GST_BIN(main_bin), bin_in2);
105 gst_bin_add(GST_BIN(main_bin), adder);
106 gst_bin_add(GST_BIN(main_bin), audiosink);
108 /* request pads and connect to adder */
110 pad = gst_element_request_pad_by_name (adder, "sink%d");
111 g_print ("new pad %s\n", gst_pad_get_name (pad));
112 gst_pad_connect (gst_element_get_pad (bin_in1, "channel1"), pad);
113 pad = gst_element_request_pad_by_name (adder, "sink%d");
114 g_print ("new pad %s\n", gst_pad_get_name (pad));
115 gst_pad_connect (gst_element_get_pad (bin_in2, "channel2"), pad);
117 /* connect adder and audiosink */
119 gst_pad_connect(gst_element_get_pad(adder,"src"),
120 gst_element_get_pad(audiosink,"sink"));
122 /* register the volume envelope */
124 gtk_object_set(GTK_OBJECT(volenv1), "controlpoint", "0:0.000001", NULL);
125 gtk_object_set(GTK_OBJECT(volenv1), "controlpoint", "5:0.000001", NULL);
126 gtk_object_set(GTK_OBJECT(volenv1), "controlpoint", "10:1", NULL);
127 gtk_object_set(GTK_OBJECT(volenv1), "controlpoint", "15:1", NULL);
128 gtk_object_set(GTK_OBJECT(volenv1), "controlpoint", "20:0.000001", NULL);
130 gtk_object_set(GTK_OBJECT(volenv2), "controlpoint", "0:1", NULL);
131 gtk_object_set(GTK_OBJECT(volenv2), "controlpoint", "5:1", NULL);
132 gtk_object_set(GTK_OBJECT(volenv2), "controlpoint", "10:0.000001", NULL);
133 gtk_object_set(GTK_OBJECT(volenv2), "controlpoint", "15:0.000001", NULL);
134 gtk_object_set(GTK_OBJECT(volenv2), "controlpoint", "20:1", NULL);
137 gst_element_set_state(main_bin, GST_STATE_PLAYING);
142 gst_bin_iterate(GST_BIN(main_bin));
146 gst_element_set_state(main_bin, GST_STATE_NULL);
148 gst_object_destroy(GST_OBJECT(audiosink));
150 gst_object_destroy(GST_OBJECT(disksrc1));
151 gst_object_destroy(GST_OBJECT(decoder1));
152 gst_object_destroy(GST_OBJECT(volenv1));
154 gst_object_destroy(GST_OBJECT(disksrc2));
155 gst_object_destroy(GST_OBJECT(decoder2));
156 gst_object_destroy(GST_OBJECT(volenv2));
158 gst_object_destroy(GST_OBJECT(bin_in1));
159 gst_object_destroy(GST_OBJECT(bin_in2));
160 gst_object_destroy(GST_OBJECT(main_bin));