Add experimental OpenAL microphone support (patch #2918507)

Add OpenAL microphone support as provided by ncalexan.
[rm: cleaned up the patch a bit using debug macros instead
     of plain printf and cleaning autotools stuff a bit.
     Not so sure it still builds on macos x so please raise
     your hand :)
]

desmume/configure.ac

@@ -92,6 +92,21 @@ AC_ARG_ENABLE(macosxhack,
 	      [AC_HELP_STRING(--enable-macosxhack, hack to build MacOSX package)],
 	      [GTK_MACOSX_HACK=yes])
 
+HAVE_OPENAL=no
+dnl - openal support
+AC_ARG_ENABLE(openal,
+	      [AC_HELP_STRING(--enable-openal, enable experimental OpenAL microphone input)],
+	      [openal=$enableval],
+	      [openal=yes])
+
+if test "x$openal" = "xyes" ; then
+	AC_CHECK_LIB([openal], [main],[
+                HAVE_OPENAL=yes
+		AC_DEFINE(HAVE_OPENAL)
+		LIBS="$LIBS -lopenal"
+	])
+fi
+
 dnl - Check for GTK and/or libglade
 FOUND_GLIB=no
 HAVE_ALSA=no
@@ -149,9 +164,11 @@ AC_PROVIDE_IFELSE([PKG_PROG_PKG_CONFIG], [
     AC_SUBST(LUA_CFLAGS)
     AC_SUBST(LUA_LIBS)
 
-    PKG_CHECK_MODULES(ALSA, alsa >= 1.0, HAVE_ALSA=yes, HAVE_ALSA=no)
-    AC_SUBST(ALSA_CFLAGS)
-    AC_SUBST(ALSA_LIBS)
+    if test ! "x$HAVE_OPENAL" = "xyes" ; then
+      PKG_CHECK_MODULES(ALSA, alsa >= 1.0, HAVE_ALSA=yes, HAVE_ALSA=no)
+      AC_SUBST(ALSA_CFLAGS)
+      AC_SUBST(ALSA_LIBS)
+    fi
 
     PKG_CHECK_MODULES(LIBAGG, libagg >= 2.5.0, HAVE_LIBAGG=yes, HAVE_LIBAGG=no)
     AC_SUBST(LIBAGG_CFLAGS)
@@ -166,9 +183,12 @@ AC_PROVIDE_IFELSE([PKG_PROG_PKG_CONFIG], [
 dnl -- force lua disabled
 AM_CONDITIONAL([HAVE_LUA], [test "${HAVE_LUA}x" = "yes"])
 
+AM_CONDITIONAL([HAVE_OPENAL], [test "${HAVE_OPENAL}" = "yes"])
 AM_CONDITIONAL([HAVE_ALSA], [test "${HAVE_ALSA}" = "yes"])
 if test "x$HAVE_ALSA" = "xno"; then
-   AC_DEFINE([FAKE_MIC])
+   if test "x$HAVE_OPENAL" = "xno"; then
+      AC_DEFINE([FAKE_MIC])
+   fi
 fi
 
 AM_CONDITIONAL([HAVE_LIBAGG], [test "${HAVE_LIBAGG}" = "yes"])
@@ -260,6 +280,10 @@ case $target in
     ;;
   *darwin*)
     LIBS="$LIBS -framework OpenGL"
+    if test "x$HAVE_OPENAL" = "xyes"; then
+      LIBS="$LIBS -framework OpenAL"
+      CPPFLAGS="$CPPFLAGS -I/System/Library/Frameworks/OpenAL.framework/Headers/"
+    fi
     if test "x$GTK_MACOSX_HACK" = "xyes" ; then
       LIBS="$LIBS -framework OpenGL -framework Gtk -framework GLib"
       CPPFLAGS="$CPPFLAGS -I/Library/Frameworks/Cairo.framework/Headers -I/Library/Frameworks/Gtk.framework/Headers -I/Library/Frameworks/GLib.framework/Headers "

desmume/src/Makefile.am

@@ -57,11 +57,17 @@ libdesmume_a_SOURCES = \
 if HAVE_WX
 libdesmume_a_SOURCES += wxdlg/wxdlg3dViewer.cpp
 endif
+
+if HAVE_OPENAL
+libdesmume_a_SOURCES += mic_openal.cpp
+else
 if HAVE_ALSA
 libdesmume_a_SOURCES += mic_alsa.cpp
 else
 libdesmume_a_SOURCES += mic.cpp
 endif
+endif
+
 if HAVE_LIBAGG
 libdesmume_a_SOURCES += aggdraw.cpp
 endif

desmume/src/mic_openal.cpp

@@ -0,0 +1,158 @@
+/* mic_openal.cpp - this file is part of DeSmuME
+ *
+ * Copyright (C) 2009 DeSmuME Team
+ *
+ * This file 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, or (at your option)
+ * any later version.
+ *
+ * This file 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; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef WIN32
+
+#include <AL/al.h>
+#include <AL/alc.h>
+
+#include "types.h"
+#include "mic.h"
+#include "readwrite.h"
+#include "emufile.h"
+#include "debug.h"
+
+#define MIC_BUFSIZE 512
+
+BOOL Mic_Inited = FALSE;
+u8 Mic_Buffer[2][2*MIC_BUFSIZE];
+u16 Mic_BufPos;
+u8 Mic_PlayBuf;
+u8 Mic_WriteBuf;
+
+int MicButtonPressed;
+
+ALCdevice *alDevice = 0;
+ALCdevice *alCaptureDevice = 0;
+ALCcontext *alContext = 0;
+
+BOOL Mic_Init()
+{
+  if (!(alDevice = alcOpenDevice(0))) {
+    INFO("Failed to Initialize Open AL\n");
+    return FALSE;
+  }
+  if( !(alContext = alcCreateContext(alDevice, 0))) {
+    INFO("Failed to create OpenAL context\n");
+    return 0;
+  }
+  if( !alcMakeContextCurrent(alContext)) {
+    INFO("Failed to make OpenAL context current\n");
+    return 0;
+  }
+  alDistanceModel(AL_INVERSE_DISTANCE);
+
+  const char *szDefaultCaptureDevice = alcGetString(NULL, ALC_CAPTURE_DEFAULT_DEVICE_SPECIFIER);
+  LOG("Default OpenAL Capture Device is '%s'\n\n", szDefaultCaptureDevice);
+  alCaptureDevice = alcCaptureOpenDevice(szDefaultCaptureDevice, 16000, AL_FORMAT_STEREO8, MIC_BUFSIZE);
+  ALenum err = alGetError();
+  if (err != AL_NO_ERROR) {
+    INFO("Failed to alCaptureOpenDevice, ALenum %i\n", err);
+    return 0;
+  }
+  alcCaptureStart(alCaptureDevice);
+
+  Mic_Inited = TRUE;
+  Mic_Reset();
+  return TRUE;
+}
+
+void Mic_Reset()
+{
+  if (!Mic_Inited)
+    return;
+  memset(Mic_Buffer, 0, MIC_BUFSIZE*2*2);
+  Mic_BufPos = 0;
+  Mic_PlayBuf = 1;
+  Mic_WriteBuf = 0;
+}
+
+void Mic_DeInit()
+{
+  if (!Mic_Inited)
+    return;
+  Mic_Inited = FALSE;
+
+  if (alDevice) {
+    if (alCaptureDevice) {
+      alcCaptureStop(alCaptureDevice);
+      alcCaptureCloseDevice(alCaptureDevice);
+    }
+    if (alContext) {
+      alcMakeContextCurrent(0);
+      alcDestroyContext(alContext);
+    }
+    alcCloseDevice(alDevice);
+  }
+}
+
+
+static void alReadSound()
+{
+  int num;
+  alcGetIntegerv(alCaptureDevice, ALC_CAPTURE_SAMPLES, 1, &num);
+  if (num < MIC_BUFSIZE-1) {
+    LOG("not enough microphone data waiting! (%i samples)\n", num);
+  }
+  LOG("%i samples waiting\n", num);
+  if (num > MIC_BUFSIZE)
+    num = MIC_BUFSIZE;
+  alcCaptureSamples(alCaptureDevice, Mic_Buffer[Mic_WriteBuf], num);
+  ALenum err = alGetError();
+  if (err != AL_NO_ERROR) {
+    INFO("Failed to alcCaptureSamples, ALenum %i\n", err);
+    return;
+  }
+}
+
+u8 stats_max;
+u8 stats_min;
+
+u8 Mic_ReadSample()
+{
+  if (Mic_BufPos >= MIC_BUFSIZE) {
+    alReadSound();
+    Mic_BufPos = 0;
+    Mic_PlayBuf ^= 1;
+    Mic_WriteBuf ^= 1;
+  }
+  u8 ret;
+  ret = Mic_Buffer[Mic_PlayBuf][Mic_BufPos >> 1];
+  if (ret > stats_max)
+    stats_max = ret;
+  if (ret < stats_min)
+    stats_min = ret;
+  Mic_BufPos += 2;
+  return ret;
+}
+
+void mic_savestate(EMUFILE* os)
+{
+	write32le(-1,os);
+}
+
+bool mic_loadstate(EMUFILE* is, int size)
+{
+	is->fseek(size, SEEK_CUR);
+	return TRUE;
+}
+
+#endif
+