integrate Odin's ALSA experiments into the Lumiera build

requires ALSA as build dependency
note: Debian package is libasound2-dev

src/tool/SConscript

@@ -10,12 +10,19 @@ envSvg = env.Clone()
 envSvg.mergeConf(['librsvg-2.0'])
 envSvg.Append(LIBS=support_lib)
 
+envSnd = env.Clone()
+envSnd.mergeConf(['alsa'])
+
+
+outputProbe = envSnd.Program('lumiera-output-probe'
+                            , ['main.c', 'alsa.c'] + core, install=True)         ## Odin's ALSA experiments
 
 luidgen =    env.Program('luidgen', ['luidgen.c'] + support_lib, install=True)   ## for generating Lumiera-UIDs
 rsvg    = envSvg.Program('rsvg-convert','rsvg-convert.c')                        ## for rendering SVG icons (uses librsvg) 
 
 # build additional test and administrative tools....
 tools = [ env.Program('hello-world','hello.c', install=True)                   #### hello world (checks C build)      
+        + outputProbe                                                          #### for output connection tests
         + luidgen
         + rsvg
         ]

src/tool/alsa.c

@@ -1,6 +1,27 @@
-#include <err.h>
-#include <math.h>
-#include <stdlib.h>
+/*
+  ALSA  -  sound output backend using the Advanced Linux Sound Architecture
+
+  Copyright (C)         Lumiera.org
+    2011,               Odin Omdal Hørthe <odin.omdal@gmail.com>
+
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU General Public License as
+  published by the Free Software Foundation; either version 2 of
+  the License, or (at your option) any later version.
+
+  This program 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 General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+* *****************************************************/
+
+
+#include "alsa.h"
 
 #include <alsa/asoundlib.h>
 

src/tool/alsa.h

@@ -0,0 +1,54 @@
+/*
+  ALSA.h  -  sound output backend using the Advanced Linux Sound Architecture
+
+  Copyright (C)         Lumiera.org
+    2011,               Odin Omdal Hørthe <odin.omdal@gmail.com>
+
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU General Public License as
+  published by the Free Software Foundation; either version 2 of
+  the License, or (at your option) any later version.
+
+  This program 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 General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+/** @file alsa.h
+ ** Interfacing to ALSA sound output.
+ ** 
+ ** @todo for now this header defines some functions used for experimentation with ALSA 
+ **
+ ** @see output-slot.hpp
+ */
+
+
+#ifndef TOOL_ALSA_H
+#define TOOL_ALSA_H
+
+
+#include <stdlib.h>
+
+
+
+size_t audio_offset();
+
+
+void audio_init();
+
+
+size_t audio_write(const void* data, size_t amount);
+
+
+void audio_start(unsigned int rate, unsigned int channel_count);
+
+
+void audio_stop();
+
+#endif // TOOL_ALSA_H

src/tool/main.c

@@ -1,6 +1,32 @@
+/*
+  OutputProbe  -  tool to investigate external output connections
+
+  Copyright (C)         Lumiera.org
+    2011,               Odin Omdal Hørthe <odin.omdal@gmail.com>
+
+  This program is free software; you can redistribute it and/or
+  modify it under the terms of the GNU General Public License as
+  published by the Free Software Foundation; either version 2 of
+  the License, or (at your option) any later version.
+
+  This program 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 General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+* *****************************************************/
+
+
+#include "alsa.h"
+
 #include <unistd.h>
 #include <stdint.h>
-#include "alsa.c"
+#include <stdio.h>
+
 
 #define SAMPLE_RATE 44100