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gstreamer/tests/examples/audiomixmatrix/test-audiomixmatrix.c
Vivia Nikolaidou fa47edf846 audiomixmatrix: New element that mixes audio channels 
This element transforms a given number of input channels into a given number of
output channels according to a given transformation matrix. The matrix
coefficients must be between -1 and 1. In the auto mode, input/output channels
are automatically negotiated and the transformation matrix is a truncated or
zero-padded identity matrix.

https://bugzilla.gnome.org/show_bug.cgi?id=777376
2017-02-23 21:02:44 +02:00

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/*
* GStreamer
* Copyright (C) 2017 Vivia Nikolaidou <vivia@toolsonair.com>
*
* test-audiomixmatrix.c
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#define USE_GST_VALUE_ARRAY
#ifndef USE_GST_VALUE_ARRAY
/* FIXME 2.0: suppress warnings for deprecated API such as GValueArray
* with newer GLib versions (>= 2.31.0) */
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#endif
#include <gst/gst.h>
#include <string.h>
static gboolean
message_cb (GstBus * bus, GstMessage * message, gpointer user_data)
{
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:{
GError *err = NULL;
gchar *debug = NULL;
gst_message_parse_error (message, &err, &debug);
gst_printerrln ("Error message received: %s", err->message);
gst_printerrln ("Debug info: %s", debug);
g_error_free (err);
g_free (debug);
}
case GST_MESSAGE_EOS:
g_main_loop_quit (user_data);
break;
default:
break;
}
return TRUE;
}
static GstPadProbeReturn
_event_received (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GstCaps *caps;
gchar *caps_str;
GstEvent *event = GST_EVENT (info->data);
if (GST_EVENT_TYPE (event) != GST_EVENT_CAPS)
return GST_PAD_PROBE_OK;
gst_event_parse_caps (event, &caps);
if (!gst_caps_is_fixed (caps))
return GST_PAD_PROBE_OK;
caps_str = gst_caps_to_string (caps);
g_print ("Caps received on %s: %s\n",
GST_PAD_IS_SRC (pad) ? "source" : "sink", caps_str);
g_free (caps_str);
return GST_PAD_PROBE_OK;
}
int
main (int argc, char **argv)
{
GstElement *audiotestsrc, *capsfilter, *audiomixmatrix, *audioconvert, *sink;
GstPad *srcpad, *sinkpad;
GstBus *bus;
GMainLoop *loop;
GstCaps *caps;
GValue v2 = G_VALUE_INIT;
GValue v3 = G_VALUE_INIT;
GstElement *pipeline;
#ifdef USE_GST_VALUE_ARRAY
GValue v = G_VALUE_INIT;
gchar *serialized_matrix;
#else
GValueArray *a, *ra;
#endif
gst_init (&argc, &argv);
audiotestsrc = gst_element_factory_make ("audiotestsrc", "audiotestsrc");
capsfilter = gst_element_factory_make ("capsfilter", "capsfilter");
caps =
gst_caps_from_string
("audio/x-raw,channels=4,channel-mask=(bitmask)0,format=S32LE");
g_object_set (capsfilter, "caps", caps, NULL);
gst_caps_unref (caps);
audiomixmatrix =
gst_element_factory_make ("audiomixmatrix", "audiomixmatrix");
g_object_set (audiomixmatrix, "in-channels", 4, NULL);
g_object_set (audiomixmatrix, "out-channels", 2, NULL);
g_object_set (audiomixmatrix, "channel-mask", 3, NULL);
/* So the serialized matrix will be: < < 1, 0, 0, 0 >, < 0, 1, 0, 0 > > */
#ifdef USE_GST_VALUE_ARRAY
g_value_init (&v, GST_TYPE_ARRAY);
g_value_init (&v2, GST_TYPE_ARRAY);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 1);
gst_value_array_append_value (&v2, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
gst_value_array_append_value (&v2, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
gst_value_array_append_value (&v2, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
gst_value_array_append_value (&v2, &v3);
g_value_unset (&v3);
gst_value_array_append_value (&v, &v2);
g_value_unset (&v2);
g_value_init (&v2, GST_TYPE_ARRAY);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
gst_value_array_append_value (&v2, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 1);
gst_value_array_append_value (&v2, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
gst_value_array_append_value (&v2, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
gst_value_array_append_value (&v2, &v3);
g_value_unset (&v3);
gst_value_array_append_value (&v, &v2);
g_value_unset (&v2);
g_object_set_property (G_OBJECT (audiomixmatrix), "matrix", &v);
/* Alternatively: gst_util_set_object_arg (audiomixmatrix, "matrix", "< < 1, 0> ..."); */
serialized_matrix = gst_value_serialize (&v);
gst_printerrln ("Serialized matrix: %s", serialized_matrix);
g_free (serialized_matrix);
g_value_unset (&v);
#else
a = g_value_array_new (4);
ra = g_value_array_new (2);
g_value_init (&v2, G_TYPE_VALUE_ARRAY);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 1);
g_value_array_append (ra, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
g_value_array_append (ra, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
g_value_array_append (ra, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
g_value_array_append (ra, &v3);
g_value_unset (&v3);
g_value_take_boxed (&v2, ra);
g_value_array_append (a, &v2);
g_value_unset (&v2);
ra = g_value_array_new (2);
g_value_init (&v2, G_TYPE_VALUE_ARRAY);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
g_value_array_append (ra, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 1);
g_value_array_append (ra, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
g_value_array_append (ra, &v3);
g_value_unset (&v3);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 0);
g_value_array_append (ra, &v3);
g_value_unset (&v3);
g_value_take_boxed (&v2, ra);
g_value_array_append (a, &v2);
g_value_unset (&v2);
g_object_set (G_OBJECT (audiomixmatrix), "matrix-value-array", a, NULL);
g_value_array_free (a);
#endif
audioconvert = gst_element_factory_make ("audioconvert", "audioconvert");
sink = gst_element_factory_make ("autoaudiosink", "sink");
pipeline = gst_pipeline_new ("pipe");
gst_bin_add_many (GST_BIN (pipeline), audiotestsrc, capsfilter,
audiomixmatrix, audioconvert, sink, NULL);
gst_element_link_many (audiotestsrc, capsfilter,
audiomixmatrix, audioconvert, sink, NULL);
srcpad = gst_element_get_static_pad (audiomixmatrix, "src");
gst_pad_add_probe (srcpad, GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
_event_received, NULL, NULL);
gst_object_unref (srcpad);
sinkpad = gst_element_get_static_pad (audiomixmatrix, "sink");
gst_pad_add_probe (sinkpad, GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
_event_received, NULL, NULL);
gst_object_unref (sinkpad);
if (gst_element_set_state (pipeline, GST_STATE_PLAYING) ==
GST_STATE_CHANGE_FAILURE) {
g_printerr ("ERROR: Could not change state in pipeline!\n");
gst_object_unref (pipeline);
return 1;
}
bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
loop = g_main_loop_new (NULL, FALSE);
gst_bus_add_signal_watch (bus);
g_signal_connect (G_OBJECT (bus), "message", G_CALLBACK (message_cb), loop);
g_main_loop_run (loop);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (bus);
gst_object_unref (pipeline);
return 0;
}
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