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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Hands-On</title><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="Advanced Gtk+ Sequencer"><link rel="up" href="ch06.html" title="Chapter 6. Your tree linked with AgsChannel"><link rel="prev" href="ch06s03.html" title="Limitations"><link rel="next" href="ch07.html" title="Chapter 7. The recycling tree"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="idp71"></a>Hands-On</h2></div></div></div>
    
    <p>
      There may be two ways how you can link AgsChannel objects.
    </p>

    <div class="example"><a name="idp33"></a><p class="title"><b>Example 6.2. Prerequisites</b></p><div class="example-contents">
      
      <pre class="programlisting">
#include &lt;glib.h&gt;
#include &lt;glib-object.h&gt;

#include &lt;ags/libags.h&gt;
#include &lt;ags/libags-audio.h&gt;

AgsAudio *master_audio, *slave_audio;
AgsLinkChannel *linkChannel;

GObject *soundcard;

GError *error;

/* instantiate AgsDevout */
soundcard = ags_devout_new(NULL);

/* create AgsAudio objects */
master_audio = (AgsAudio *) g_object_new(AGS_TYPE_AUDIO,
                                         "soundcard\0", soundcard,
                                         NULL);
slave_audio = (AgsAudio *) g_object_new(AGS_TYPE_AUDIO,
                                        "soundcard\0", soundcard,
                                        NULL);

/* assign AgsAudioSignal objects to master_audio and slave_audio */
ags_audio_set_flags(master_audio,
                    AGS_AUDIO_OUTPUT_HAS_RECYCLING);
ags_audio_set_flags(slave_audio,
                    (AGS_AUDIO_ASYNC | AGS_AUDIO_OUTPUT_HAS_RECYCLING | AGS_AUDIO_INPUT_HAS_RECYCLING));

/* create AgsChannel objects within master_audio and slave_audio */
ags_audio_set_audio_channels(master_audio, 2);
ags_audio_set_pads(master_audio, AGS_TYPE_OUTPUT, 1);
ags_audio_set_pads(master_audio, AGS_TYPE_INPUT, 1);
      
ags_audio_set_audio_channels(slave_audio, 2);
ags_audio_set_pads(slave_audio, AGS_TYPE_OUTPUT, 1);
ags_audio_set_pads(slave_audio, AGS_TYPE_INPUT, 8);

      </pre>
    </div></div><br class="example-break">

    <p>
      Assumed you know really what you do, you may be interested in following code.
    </p>

    <div class="example"><a name="idp34"></a><p class="title"><b>Example 6.3. Thread-Unsafe way</b></p><div class="example-contents">
      
      <pre class="programlisting">
#include &lt;glib.h&gt;
#include &lt;glib-object.h&gt;

#include &lt;ags/libags.h&gt;
#include &lt;ags/libags-audio.h&gt;

AgsAudio *master_audio, *slave_audio;
AgsLinkChannel *linkChannel;

GObject *soundcard;

GError *error;

/* instantiate AgsDevout */
soundcard = ags_devout_new(NULL);

/* create AgsAudio objects */
master_audio = (AgsAudio *) g_object_new(AGS_TYPE_AUDIO,
                                         "soundcard\0", soundcard,
                                         NULL);
slave_audio = (AgsAudio *) g_object_new(AGS_TYPE_AUDIO,
                                        "soundcard\0", soundcard,
                                        NULL);

/* link master_audio's input with slave_audio's output */
ags_channel_set_link(ags_channel_nth(master_audio-&gt;input, 0),
                     ags_channel_nth(slave_audio-&gt;output, 0),
                     &amp;error);
  

ags_channel_set_link(ags_channel_nth(master_audio-&gt;input, 1),
                     ags_channel_nth(slave_audio-&gt;output, 1),
                     &amp;error);

      </pre>
    </div></div><br class="example-break">

    <p>
      But generally you wish to create an AgsTask object and let it to link the
      AgsChannel for you.
    </p>

    <div class="example"><a name="idp35"></a><p class="title"><b>Example 6.4. Multithread-Safe way</b></p><div class="example-contents">
      
      <pre class="programlisting">
#include &lt;glib.h&gt;
#include &lt;glib-object.h&gt;

#include &lt;ags/libags.h&gt;
#include &lt;ags/libags-audio.h&gt;

AgsApplicationContext *application_context;
AgsTaskThread *task_thread;

application_context = ags_application_context_get_instance();
task_thread = application_context-&gt;task_thread;

/* creating AgsLink task and add it to AgsDevout */
link_channel = ags_link_channel_new(ags_channel_nth(master_audio-&gt;input, 0),
                                    ags_channel_nth(slave_audio-&gt;output, 0));
ags_task_thread_append_task(task_thread,
			    link_channel);  

link_channel = ags_link_channel_new(ags_channel_nth(master_audio-&gt;input, 1),
                                    ags_channel_nth(slave_audio-&gt;output, 1));
ags_task_thread_append_task(task_thread,
			    link_channel);

      </pre>
    </div></div><br class="example-break">

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