src/audio/fusionsound/SDL_fsaudio.c
changeset 2947 fec0db6c44b7
child 3230 816a7a65a59a
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/audio/fusionsound/SDL_fsaudio.c	Thu Jan 01 21:34:22 2009 +0000
@@ -0,0 +1,345 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library 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
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+/* Allow access to a raw mixing buffer */
+
+#ifdef HAVE_SIGNAL_H
+#include <signal.h>
+#endif
+#include <unistd.h>
+
+#include "SDL_timer.h"
+#include "SDL_audio.h"
+#include "../SDL_audiomem.h"
+#include "../SDL_audio_c.h"
+#include "SDL_fsaudio.h"
+
+//#define SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC "libfusionsound.so"
+
+#ifdef SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC
+#include "SDL_name.h"
+#include "SDL_loadso.h"
+#else
+#define SDL_NAME(X)	X
+#endif
+
+/* The tag name used by fusionsoundc audio */
+#define SDL_FS_DRIVER_NAME         "fusionsound"
+/* Buffers to use - more than 2 gives a lot of latency */
+#define FUSION_BUFFERS				(2)
+
+#ifdef SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC
+
+static const char *fs_library = SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC;
+static void *fs_handle = NULL;
+
+static DirectResult(*SDL_NAME(FusionSoundInit)) (int *argc, char *(*argv[]));
+static DirectResult(*SDL_NAME(FusionSoundCreate)) (IFusionSound **
+                                                   ret_interface);
+
+#define SDL_FS_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
+static struct
+{
+    const char *name;
+    void **func;
+} fs_functions[] = {
+/* *INDENT-OFF* */
+    SDL_FS_SYM(FusionSoundInit),
+    SDL_FS_SYM(FusionSoundCreate),
+/* *INDENT-ON* */
+};
+
+#undef SDL_FS_SYM
+
+static void
+UnloadFusionSoundLibrary()
+{
+    if (fs_handle != NULL) {
+        SDL_UnloadObject(fs_handle);
+        fs_handle = NULL;
+    }
+}
+
+static int
+LoadFusionSoundLibrary(void)
+{
+    int i, retval = -1;
+
+    if (fs_handle == NULL) {
+        fs_handle = SDL_LoadObject(fs_library);
+        if (fs_handle != NULL) {
+            retval = 0;
+            for (i = 0; i < SDL_arraysize(fs_functions); ++i) {
+                *fs_functions[i].func =
+                    SDL_LoadFunction(fs_handle, fs_functions[i].name);
+                if (!*fs_functions[i].func) {
+                    retval = -1;
+                    UnloadFusionSoundLibrary();
+                    break;
+                }
+            }
+        }
+    }
+
+    return retval;
+}
+
+#else
+
+static void
+UnloadFusionSoundLibrary()
+{
+    return;
+}
+
+static int
+LoadFusionSoundLibrary(void)
+{
+    return 0;
+}
+
+#endif /* SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC */
+
+/* This function waits until it is possible to write a full sound buffer */
+static void
+SDL_FS_WaitDevice(_THIS)
+{
+    this->hidden->stream->Wait(this->hidden->stream,
+                               this->hidden->mixsamples);
+}
+
+static void
+SDL_FS_PlayDevice(_THIS)
+{
+    DirectResult ret;
+
+    ret = this->hidden->stream->Write(this->hidden->stream,
+                                      this->hidden->mixbuf,
+                                      this->hidden->mixsamples);
+    /* If we couldn't write, assume fatal error for now */
+    if (ret) {
+        this->enabled = 0;
+    }
+#ifdef DEBUG_AUDIO
+    fprintf(stderr, "Wrote %d bytes of audio data\n", this->hidden->mixlen);
+#endif
+}
+
+static void
+SDL_FS_WaitDone(_THIS)
+{
+    this->hidden->stream->Wait(this->hidden->stream,
+                               this->hidden->mixsamples * FUSION_BUFFERS);
+}
+
+
+static Uint8 *
+SDL_FS_GetDeviceBuf(_THIS)
+{
+    return (this->hidden->mixbuf);
+}
+
+
+static void
+SDL_FS_CloseDevice(_THIS)
+{
+    if (this->hidden != NULL) {
+        if (this->hidden->mixbuf != NULL) {
+            SDL_FreeAudioMem(this->hidden->mixbuf);
+            this->hidden->mixbuf = NULL;
+        }
+        if (this->hidden->stream) {
+            this->hidden->stream->Release(this->hidden->stream);
+            this->hidden->stream = NULL;
+        }
+        if (this->hidden->fs) {
+            this->hidden->fs->Release(this->hidden->fs);
+            this->hidden->fs = NULL;
+        }
+        SDL_free(this->hidden);
+        this->hidden = NULL;
+    }
+}
+
+
+static int
+SDL_FS_OpenDevice(_THIS, const char *devname, int iscapture)
+{
+    int bytes;
+    SDL_AudioFormat test_format = 0, format = 0;
+    FSSampleFormat fs_format;
+    FSStreamDescription desc;
+    DirectResult ret;
+
+    /* Initialize all variables that we clean on shutdown */
+    this->hidden = (struct SDL_PrivateAudioData *)
+        SDL_malloc((sizeof *this->hidden));
+    if (this->hidden == NULL) {
+        SDL_OutOfMemory();
+        return 0;
+    }
+    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
+
+    /* Try for a closest match on audio format */
+    for (test_format = SDL_FirstAudioFormat(this->spec.format);
+         !format && test_format;) {
+#ifdef DEBUG_AUDIO
+        fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
+#endif
+        switch (test_format) {
+        case AUDIO_U8:
+            fs_format = FSSF_U8;
+            bytes = 1;
+            format = 1;
+            break;
+        case AUDIO_S16SYS:
+            fs_format = FSSF_S16;
+            bytes = 2;
+            format = 1;
+            break;
+        case AUDIO_S32SYS:
+            fs_format = FSSF_S32;
+            bytes = 4;
+            format = 1;
+            break;
+        case AUDIO_F32SYS:
+            fs_format = FSSF_FLOAT;
+            bytes = 4;
+            format = 1;
+            break;
+        default:
+            format = 0;
+            break;
+        }
+        if (!format) {
+            test_format = SDL_NextAudioFormat();
+        }
+    }
+
+    if (format == 0) {
+        SDL_FS_CloseDevice(this);
+        SDL_SetError("Couldn't find any hardware audio formats");
+        return 0;
+    }
+    this->spec.format = test_format;
+
+    /* Retrieve the main sound interface. */
+    ret = SDL_NAME(FusionSoundCreate) (&this->hidden->fs);
+    if (ret) {
+        SDL_FS_CloseDevice(this);
+        SDL_SetError("Unable to initialize FusionSound: %d", ret);
+        return 0;
+    }
+
+    this->hidden->mixsamples = this->spec.size / bytes / this->spec.channels;
+
+    /* Fill stream description. */
+    desc.flags = FSSDF_SAMPLERATE | FSSDF_BUFFERSIZE |
+        FSSDF_CHANNELS | FSSDF_SAMPLEFORMAT | FSSDF_PREBUFFER;
+    desc.samplerate = this->spec.freq;
+    desc.buffersize = this->spec.size * FUSION_BUFFERS;
+    desc.channels = this->spec.channels;
+    desc.prebuffer = 10;
+    desc.sampleformat = fs_format;
+
+    ret =
+        this->hidden->fs->CreateStream(this->hidden->fs, &desc,
+                                       &this->hidden->stream);
+    if (ret) {
+        SDL_FS_CloseDevice(this);
+        SDL_SetError("Unable to create FusionSoundStream: %d", ret);
+        return 0;
+    }
+
+    /* See what we got */
+    desc.flags = FSSDF_SAMPLERATE | FSSDF_BUFFERSIZE |
+        FSSDF_CHANNELS | FSSDF_SAMPLEFORMAT;
+    ret = this->hidden->stream->GetDescription(this->hidden->stream, &desc);
+
+    this->spec.freq = desc.samplerate;
+    this->spec.size =
+        desc.buffersize / FUSION_BUFFERS * bytes * desc.channels;
+    this->spec.channels = desc.channels;
+
+    /* Calculate the final parameters for this audio specification */
+    SDL_CalculateAudioSpec(&this->spec);
+
+    /* Allocate mixing buffer */
+    this->hidden->mixlen = this->spec.size;
+    this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
+    if (this->hidden->mixbuf == NULL) {
+        SDL_FS_CloseDevice(this);
+        SDL_OutOfMemory();
+        return 0;
+    }
+    SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
+
+    /* We're ready to rock and roll. :-) */
+    return 1;
+}
+
+
+static void
+SDL_FS_Deinitialize(void)
+{
+    UnloadFusionSoundLibrary();
+}
+
+
+static int
+SDL_FS_Init(SDL_AudioDriverImpl * impl)
+{
+    if (LoadFusionSoundLibrary() < 0) {
+        return 0;
+    } else {
+        DirectResult ret;
+
+        ret = SDL_NAME(FusionSoundInit) (NULL, NULL);
+        if (ret) {
+            UnloadFusionSoundLibrary();
+            SDL_SetError
+                ("FusionSound: SDL_FS_init failed (FusionSoundInit: %d)",
+                 ret);
+            return 0;
+        }
+    }
+
+    /* Set the function pointers */
+    impl->OpenDevice = SDL_FS_OpenDevice;
+    impl->PlayDevice = SDL_FS_PlayDevice;
+    impl->WaitDevice = SDL_FS_WaitDevice;
+    impl->GetDeviceBuf = SDL_FS_GetDeviceBuf;
+    impl->CloseDevice = SDL_FS_CloseDevice;
+    impl->WaitDone = SDL_FS_WaitDone;
+    impl->Deinitialize = SDL_FS_Deinitialize;
+    impl->OnlyHasDefaultOutputDevice = 1;
+
+    return 1;
+}
+
+
+AudioBootStrap FUSIONSOUND_bootstrap = {
+    SDL_FS_DRIVER_NAME, "FusionSound", SDL_FS_Init, 0
+};
+
+/* vi: set ts=4 sw=4 expandtab: */