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authorrubidium <rubidium@openttd.org>2008-11-25 21:09:00 +0000
committerrubidium <rubidium@openttd.org>2008-11-25 21:09:00 +0000
commit5ebb48fa8633dc90e7fd6343f117d513f682dc1e (patch)
tree8f56ace83113a8c96887be195a473b1132beb9e5 /src/sound/allegro_s.cpp
parent285d1846aebfc5bf3b874ff5d431a568e6a49da2 (diff)
downloadopenttd-5ebb48fa8633dc90e7fd6343f117d513f682dc1e.tar.xz
(svn r14631) -Add: support for Allegro as sound backend.
Diffstat (limited to 'src/sound/allegro_s.cpp')
-rw-r--r--src/sound/allegro_s.cpp74
1 files changed, 74 insertions, 0 deletions
diff --git a/src/sound/allegro_s.cpp b/src/sound/allegro_s.cpp
new file mode 100644
index 000000000..f3d9579a9
--- /dev/null
+++ b/src/sound/allegro_s.cpp
@@ -0,0 +1,74 @@
+/* $Id$ */
+
+/** @file allegro_s.cpp Playing sound via Allegro. */
+
+#ifdef WITH_ALLEGRO
+
+#include "../stdafx.h"
+
+#include "../driver.h"
+#include "../mixer.h"
+#include "../sdl.h"
+#include "allegro_s.h"
+#include <allegro.h>
+
+static FSoundDriver_Allegro iFSoundDriver_Allegro;
+/** The stream we are writing too */
+static AUDIOSTREAM *_stream = NULL;
+/** The number of samples in the buffer */
+static const int BUFFER_SIZE = 512;
+
+void SoundDriver_Allegro::MainLoop()
+{
+ /* We haven't opened a stream yet */
+ if (_stream == NULL) return;
+
+ void *data = get_audio_stream_buffer(_stream);
+ /* We don't have to fill the stream yet */
+ if (data == NULL) return;
+
+ /* Mix the samples */
+ MxMixSamples(data, BUFFER_SIZE);
+
+ /* Allegro sound is always unsigned, so we need to correct that */
+ uint16 *snd = (uint16*)data;
+ for (int i = 0; i < BUFFER_SIZE * 2; i++) snd[i] ^= 0x8000;
+
+ /* Tell we've filled the stream */
+ free_audio_stream_buffer(_stream);
+}
+
+/** There are multiple modules that might be using Allegro and
+ * Allegro can only be initiated once. */
+extern int _allegro_count;
+
+const char *SoundDriver_Allegro::Start(const char * const *parm)
+{
+ if (_allegro_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, NULL)) return NULL;
+ _allegro_count++;
+
+ /* Initialise the sound */
+ if (install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, NULL) != 0) return NULL;
+
+ /* Okay, there's no soundcard */
+ if (digi_card == DIGI_NONE) {
+ DEBUG(driver, 0, "allegro: no sound card found");
+ return NULL;
+ }
+
+ _stream = play_audio_stream(BUFFER_SIZE, 16, true, 11025, 255, 128);
+ return NULL;
+}
+
+void SoundDriver_Allegro::Stop()
+{
+ if (_stream != NULL) {
+ stop_audio_stream(_stream);
+ _stream = NULL;
+ }
+ remove_sound();
+
+ if (--_allegro_count == 0) allegro_exit();
+}
+
+#endif /* WITH_ALLEGRO */