Add Jack Audio support

.gitignore

@@ -1 +1,3 @@
-build/
+build/
+buildScript.sh
+shaders/glava/rc_test.glsl

README.md

@@ -1,4 +1,6 @@
 
+***Note:*** *This fork of GLava introduces support for the JACK Audio Connector Kit.*
+
 <img align="left" width="200" height="200" src="https://thumbs.gfycat.com/DefiantInformalIndianspinyloach-size_restricted.gif" />
 
 **GLava** is a general-purpose, highly configurable OpenGL audio spectrum visualizer for X11. Displayed to the left is the `radial` shader module, or for a more extensive demonstration [see this demo](https://streamable.com/dgpj8). Development is active, and reporting issues is encouranged.
@@ -34,7 +36,8 @@ Note that versions since `2.0` use Meson for the build system, although the `Mak
 **Additional compile time requirements:**
 
 - Meson
-- OBS (disable with `-Ddisable_obs=true`)
+- OBS (disable with `-Ddisable-obs=true`)
+- JACK
 
 **Optional requirements:**
 

glava/jack_input.c

@@ -0,0 +1,115 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <jack/jack.h>
+
+#include "fifo.h"
+
+
+/* GLava backend and configuration */
+struct audio_data *audio;
+size_t buffer_size;
+
+/* JACK backend */
+jack_client_t *client;
+jack_port_t *input_port1, *input_port2;
+
+
+
+/* 
+ * Callback function for JACK.
+ * Appends new samples to GLava buffer and marks it as modified.
+ */
+int process (jack_nframes_t nframes, void *arg) {
+    float* samples1 = (jack_default_audio_sample_t*)jack_port_get_buffer
+                        (input_port1, nframes);
+    float* samples2 = (jack_default_audio_sample_t*)jack_port_get_buffer
+                        (input_port2, nframes);
+
+    pthread_mutex_lock(&audio->mutex);
+    float* bl = (float*) audio->audio_out_l;
+    float* br = (float*) audio->audio_out_r;
+
+    size_t buffer_steps = (size_t) nframes;
+    size_t buffer_offset = buffer_size - buffer_steps;
+    memmove(bl, &bl[buffer_steps], buffer_offset * sizeof(float));
+    memmove(br, &br[buffer_steps], buffer_offset * sizeof(float));
+
+    for (int frame = 0; frame < buffer_steps; frame++) {
+        bl[buffer_offset + frame] = samples1[frame];
+        br[buffer_offset + frame] = samples2[frame];
+    }
+
+    audio->modified = true;
+    pthread_mutex_unlock(&audio->mutex);
+
+    return 0;
+}
+
+void jack_shutdown (void *arg) {
+    //Do more cleanup here if needed
+}
+
+static void init(struct audio_data* audio) {
+    if (!audio->source)
+        audio->source = strdup ("JACK");
+
+    const char *client_name = "GLava";
+    const char *server_name = NULL;
+    jack_options_t options = JackNullOption;
+    jack_status_t status;
+    client = jack_client_open (client_name, options, &status, server_name);
+
+    if (client == NULL) {
+        fprintf (stderr, "jack_client_open() failed, status = 0x%2.0x\n",
+                    status);
+        if (status & JackServerFailed) {
+            printf ("Unable to connect to JACK server!\n");
+        }
+        exit (1);
+    }
+    if (status & JackServerStarted) {
+        fprintf (stdout, "JACK server started\n");
+    }
+    if (status & JackNameNotUnique) {
+        client_name = jack_get_client_name (client);
+        fprintf (stderr, "Unique name '%s' assigned!\n", client_name);
+    }
+
+    jack_on_shutdown (client, jack_shutdown, 0);
+
+    input_port1 = jack_port_register (client, "input1", JACK_DEFAULT_AUDIO_TYPE,
+                                        JackPortIsInput, 0);
+    input_port2 = jack_port_register (client, "input2", JACK_DEFAULT_AUDIO_TYPE,
+                                        JackPortIsInput, 0);
+    
+    if ((input_port1 == NULL) || (input_port2 == NULL)) {
+        fprintf (stderr, "No more JACK ports available!\n");
+        exit (1);
+    }
+}
+
+static void* entry(void* data) {
+    audio = (struct audio_data *) data;
+    buffer_size = audio->audio_buf_sz;
+
+    jack_set_process_callback (client, process, NULL);
+    if (jack_activate (client)) {
+        fprintf (stderr, "Cannot activate client!\n");
+        exit (1);
+    }
+    
+    while (true) {
+        sleep(1);
+
+        if (audio->terminate == 1) {
+            break;
+        }
+    }
+
+    jack_client_close (client);
+    return 0;
+}
+
+AUDIO_ATTACH (jack);

glava/jack_input.h

@@ -0,0 +1,7 @@
+
+#ifndef JACK_INPUT_H
+#define JACK_INPUT_H
+
+#include "fifo.h"
+
+#endif

meson.build

@@ -25,7 +25,8 @@ glava_dependencies = [
   cc.find_library('dl'),
   cc.find_library('m'),
   cc.find_library('X11'),
-  cc.find_library('Xext')
+  cc.find_library('Xext'),
+  cc.find_library('jack')
 ]
 
 if cc.get_id() == 'clang'