add mikmod source

[dosdemo] / libs / mikmod / drivers / drv_sdl.c

diff --git a/libs/mikmod/drivers/drv_sdl.c b/libs/mikmod/drivers/drv_sdl.c
new file mode 100644 (file)
index 0000000..e5a1ba2
--- /dev/null
+++ b/libs/mikmod/drivers/drv_sdl.c
@@ -0,0 +1,205 @@
+/*  MikMod sound library
+    (c) 1998-2005 Miodrag Vallat and others - see file AUTHORS for
+    complete list.
+
+    This library is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Library 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 Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+    */
+
+/*==============================================================================
+
+  libmikmod driver for audio output on SDL-supported platforms.
+  Initially written by Paul Spark <sparkynz74@gmail.com>
+  Rewrite/major fixes by O. Sezer <sezero@users.sourceforge.net>
+
+  ==============================================================================*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "mikmod_internals.h"
+
+#ifdef DRV_SDL
+
+#include <string.h>
+#if defined(SDL_FRAMEWORK) || defined(NO_SDL_CONFIG)
+#include <SDL/SDL.h>
+#else
+#include "SDL.h"
+#endif
+
+#define NUMSAMPLES 256 /* a fair default for md_mixfreq <= 11025 Hz */
+static SDL_AudioSpec spec;
+static int enabled = 0;
+
+static void SDLSoundCallback(void *userdata, Uint8 *stream, int len)
+{
+    if (!enabled) return;
+    if (enabled < 0) {
+        if (++enabled == 0)
+            enabled = 1;
+        return;
+    }
+
+    MUTEX_LOCK(vars);
+    if (Player_Paused_internal()) {
+        VC_SilenceBytes((SBYTE *) stream, (ULONG)len);
+    }
+    else
+    {
+        int got = (int) VC_WriteBytes((SBYTE *) stream, (ULONG)len);
+        if (got < len) {       /* fill the rest with silence, then */
+            VC_SilenceBytes((SBYTE *) &stream[got], (ULONG)(len-got));
+        }
+    }
+    MUTEX_UNLOCK(vars);
+}
+
+static BOOL SetupSDLAudio(void)
+{
+    SDL_AudioSpec wanted;
+
+    wanted.freq     = md_mixfreq;
+    wanted.format   =
+#if (SDL_MAJOR_VERSION >= 2)
+                      (md_mode & DMODE_FLOAT) ? AUDIO_F32SYS :
+#endif
+                      (md_mode & DMODE_16BITS)? AUDIO_S16SYS : AUDIO_U8;
+    wanted.channels = (md_mode & DMODE_STEREO)? 2 : 1;
+    wanted.samples  = (md_mixfreq <= 11025)? (NUMSAMPLES    ) :
+                      (md_mixfreq <= 22050)? (NUMSAMPLES * 2) :
+                      (md_mixfreq <= 44100)? (NUMSAMPLES * 4) :
+                                             (NUMSAMPLES * 8);
+    wanted.userdata = NULL;
+    wanted.callback = SDLSoundCallback;
+
+    if (SDL_OpenAudio(&wanted, &spec) < 0) {
+        _mm_errno=MMERR_OPENING_AUDIO;
+        return 0;
+    }
+
+    return 1;
+}
+
+static BOOL SDLDrv_IsPresent(void)
+{
+    if ((SDL_WasInit(SDL_INIT_AUDIO)) == 0) {
+        if (SDL_Init(SDL_INIT_AUDIO) < 0)
+            return 0;
+        SDL_QuitSubSystem(SDL_INIT_AUDIO);
+    }
+    return 1;
+}
+
+static int SDLDrv_Init(void)
+{
+#if (SDL_MAJOR_VERSION < 2)
+    if (md_mode & DMODE_FLOAT) {
+        _mm_errno=MMERR_NO_FLOAT32;
+        return 1;
+    }
+#endif
+    if (SDL_Init(SDL_INIT_AUDIO) < 0) {
+        _mm_errno=MMERR_OPENING_AUDIO;
+        return 1;
+    }
+    if (!SetupSDLAudio()) {
+        return 1;
+    }
+
+    md_mode |= DMODE_SOFT_MUSIC;
+    if (VC_Init())
+        return 1;
+
+    enabled = -2; /* delay the callback 2 frames */
+    return 0;
+}
+
+static void SDLDrv_Exit(void)
+{
+    SDL_LockAudio();
+    enabled = 0;
+    SDL_UnlockAudio();
+    SDL_CloseAudio();
+    VC_Exit();
+}
+
+static int SDLDrv_Reset(void)
+{
+    SDLDrv_Exit();
+    return SDLDrv_Init();
+}
+
+static void SDLDrv_Update( void )
+{
+/* do nothing */
+}
+
+static void SDLDrv_PlayStop(void)
+{
+    SDL_PauseAudio(1);
+    VC_PlayStop();
+}
+
+static int SDLDrv_PlayStart(void)
+{
+    if (VC_PlayStart())
+        return 1;
+    SDL_PauseAudio(0);
+    return 0;
+}
+
+MIKMODAPI struct MDRIVER drv_sdl =
+{
+    NULL,
+    "SDL",
+    "SDL Driver v1.3",
+    0,255,
+    "sdl",
+    NULL,
+    NULL,
+    SDLDrv_IsPresent,
+    VC_SampleLoad,
+    VC_SampleUnload,
+    VC_SampleSpace,
+    VC_SampleLength,
+    SDLDrv_Init,
+    SDLDrv_Exit,
+    SDLDrv_Reset,
+    VC_SetNumVoices,
+    SDLDrv_PlayStart,
+    SDLDrv_PlayStop,
+    SDLDrv_Update,
+    NULL,
+    VC_VoiceSetVolume,
+    VC_VoiceGetVolume,
+    VC_VoiceSetFrequency,
+    VC_VoiceGetFrequency,
+    VC_VoiceSetPanning,
+    VC_VoiceGetPanning,
+    VC_VoicePlay,
+    VC_VoiceStop,
+    VC_VoiceStopped,
+    VC_VoiceGetPosition,
+    VC_VoiceRealVolume
+};
+
+#else
+
+MISSING(drv_sdl);
+
+#endif
+