1 /*
2 * GStreamer
3 * Copyright (C) 2017 Vivia Nikolaidou <vivia@toolsonair.com>
4 *
5 * test-audiomixmatrix.c
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23 #include <gst/gst.h>
24 #include <string.h>
25
26 static gboolean
message_cb(GstBus * bus,GstMessage * message,gpointer user_data)27 message_cb (GstBus * bus, GstMessage * message, gpointer user_data)
28 {
29 switch (GST_MESSAGE_TYPE (message)) {
30 case GST_MESSAGE_ERROR:{
31 GError *err = NULL;
32 gchar *debug = NULL;
33
34 gst_message_parse_error (message, &err, &debug);
35 gst_printerrln ("Error message received: %s", err->message);
36 gst_printerrln ("Debug info: %s", debug);
37 g_error_free (err);
38 g_free (debug);
39 }
40 case GST_MESSAGE_EOS:
41 g_main_loop_quit (user_data);
42 break;
43 default:
44 break;
45 }
46 return TRUE;
47 }
48
49 static GstPadProbeReturn
_event_received(GstPad * pad,GstPadProbeInfo * info,gpointer user_data)50 _event_received (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
51 {
52 GstCaps *caps;
53 gchar *caps_str;
54 GstEvent *event = GST_EVENT (info->data);
55
56 if (GST_EVENT_TYPE (event) != GST_EVENT_CAPS)
57 return GST_PAD_PROBE_OK;
58
59 gst_event_parse_caps (event, &caps);
60 if (!gst_caps_is_fixed (caps))
61 return GST_PAD_PROBE_OK;
62
63 caps_str = gst_caps_to_string (caps);
64
65 g_print ("Caps received on %s: %s\n",
66 GST_PAD_IS_SRC (pad) ? "source" : "sink", caps_str);
67
68 g_free (caps_str);
69
70 return GST_PAD_PROBE_OK;
71 }
72
73 int
main(int argc,char ** argv)74 main (int argc, char **argv)
75 {
76 GstElement *audiotestsrc, *capsfilter, *audiomixmatrix, *audioconvert, *sink;
77 GstPad *srcpad, *sinkpad;
78 GstBus *bus;
79 GMainLoop *loop;
80 GstCaps *caps;
81 GValue v2 = G_VALUE_INIT;
82 GValue v3 = G_VALUE_INIT;
83 GstElement *pipeline;
84 GValue v = G_VALUE_INIT;
85 gchar *serialized_matrix;
86
87 gst_init (&argc, &argv);
88
89 audiotestsrc = gst_element_factory_make ("audiotestsrc", "audiotestsrc");
90 capsfilter = gst_element_factory_make ("capsfilter", "capsfilter");
91 caps =
92 gst_caps_from_string
93 ("audio/x-raw,channels=4,channel-mask=(bitmask)0,format=S32LE");
94 g_object_set (capsfilter, "caps", caps, NULL);
95 gst_caps_unref (caps);
96 audiomixmatrix =
97 gst_element_factory_make ("audiomixmatrix", "audiomixmatrix");
98 g_object_set (audiomixmatrix, "in-channels", 4, NULL);
99 g_object_set (audiomixmatrix, "out-channels", 2, NULL);
100 g_object_set (audiomixmatrix, "channel-mask", 3, NULL);
101 /* So the serialized matrix will be: < < 1, 0, 0, 0 >, < 0, 1, 0, 0 > > */
102 g_value_init (&v, GST_TYPE_ARRAY);
103 g_value_init (&v2, GST_TYPE_ARRAY);
104 g_value_init (&v3, G_TYPE_DOUBLE);
105 g_value_set_double (&v3, 1);
106 gst_value_array_append_value (&v2, &v3);
107 g_value_unset (&v3);
108 g_value_init (&v3, G_TYPE_DOUBLE);
109 g_value_set_double (&v3, 0);
110 gst_value_array_append_value (&v2, &v3);
111 g_value_unset (&v3);
112 g_value_init (&v3, G_TYPE_DOUBLE);
113 g_value_set_double (&v3, 0);
114 gst_value_array_append_value (&v2, &v3);
115 g_value_unset (&v3);
116 g_value_init (&v3, G_TYPE_DOUBLE);
117 g_value_set_double (&v3, 0);
118 gst_value_array_append_value (&v2, &v3);
119 g_value_unset (&v3);
120 gst_value_array_append_value (&v, &v2);
121 g_value_unset (&v2);
122 g_value_init (&v2, GST_TYPE_ARRAY);
123 g_value_init (&v3, G_TYPE_DOUBLE);
124 g_value_set_double (&v3, 0);
125 gst_value_array_append_value (&v2, &v3);
126 g_value_unset (&v3);
127 g_value_init (&v3, G_TYPE_DOUBLE);
128 g_value_set_double (&v3, 1);
129 gst_value_array_append_value (&v2, &v3);
130 g_value_unset (&v3);
131 g_value_init (&v3, G_TYPE_DOUBLE);
132 g_value_set_double (&v3, 0);
133 gst_value_array_append_value (&v2, &v3);
134 g_value_unset (&v3);
135 g_value_init (&v3, G_TYPE_DOUBLE);
136 g_value_set_double (&v3, 0);
137 gst_value_array_append_value (&v2, &v3);
138 g_value_unset (&v3);
139 gst_value_array_append_value (&v, &v2);
140 g_value_unset (&v2);
141 g_object_set_property (G_OBJECT (audiomixmatrix), "matrix", &v);
142 /* Alternatively: gst_util_set_object_arg (audiomixmatrix, "matrix", "< < 1, 0> ..."); */
143 serialized_matrix = gst_value_serialize (&v);
144 gst_printerrln ("Serialized matrix: %s", serialized_matrix);
145 g_free (serialized_matrix);
146 g_value_unset (&v);
147 audioconvert = gst_element_factory_make ("audioconvert", "audioconvert");
148 sink = gst_element_factory_make ("autoaudiosink", "sink");
149 pipeline = gst_pipeline_new ("pipe");
150 gst_bin_add_many (GST_BIN (pipeline), audiotestsrc, capsfilter,
151 audiomixmatrix, audioconvert, sink, NULL);
152 gst_element_link_many (audiotestsrc, capsfilter,
153 audiomixmatrix, audioconvert, sink, NULL);
154
155 srcpad = gst_element_get_static_pad (audiomixmatrix, "src");
156 gst_pad_add_probe (srcpad, GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
157 _event_received, NULL, NULL);
158 gst_object_unref (srcpad);
159 sinkpad = gst_element_get_static_pad (audiomixmatrix, "sink");
160 gst_pad_add_probe (sinkpad, GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
161 _event_received, NULL, NULL);
162 gst_object_unref (sinkpad);
163
164 if (gst_element_set_state (pipeline, GST_STATE_PLAYING) ==
165 GST_STATE_CHANGE_FAILURE) {
166 g_printerr ("ERROR: Could not change state in pipeline!\n");
167 gst_object_unref (pipeline);
168 return 1;
169 }
170
171 bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
172 loop = g_main_loop_new (NULL, FALSE);
173 gst_bus_add_signal_watch (bus);
174 g_signal_connect (G_OBJECT (bus), "message", G_CALLBACK (message_cb), loop);
175 g_main_loop_run (loop);
176
177 gst_element_set_state (pipeline, GST_STATE_NULL);
178 gst_object_unref (bus);
179 gst_object_unref (pipeline);
180
181
182 return 0;
183
184 }
185