mirror of
https://github.com/libretro/RetroArch.git
synced 2024-11-24 08:30:16 +00:00
164 lines
3.4 KiB
C
164 lines
3.4 KiB
C
/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
|
|
* Copyright (C) 2010-2011 - Hans-Kristian Arntzen
|
|
*
|
|
* Some code herein may be based on code found in BSNES.
|
|
*
|
|
* SSNES 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 Found-
|
|
* ation, either version 3 of the License, or (at your option) any later version.
|
|
*
|
|
* SSNES 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 SSNES.
|
|
* If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
|
|
#include "driver.h"
|
|
#include <stdlib.h>
|
|
#include "xaudio-c.h"
|
|
#include "general.h"
|
|
|
|
#define WIN32_LEAN_AND_MEAN
|
|
#include <windows.h>
|
|
|
|
typedef struct
|
|
{
|
|
xaudio2_t *xa;
|
|
bool nonblock;
|
|
} xa_t;
|
|
|
|
static xaudio2_new_t pxanew = NULL;
|
|
static xaudio2_write_t pxawrite = NULL;
|
|
static xaudio2_write_avail_t pxawrite_avail = NULL;
|
|
static xaudio2_free_t pxafree = NULL;
|
|
static HMODULE lib = NULL;
|
|
|
|
#define LIB_NAME "xaudio-c.dll"
|
|
#define SYM(X) ((void*)GetProcAddress(lib, "xaudio2_" #X))
|
|
|
|
static void deinit_lib(void)
|
|
{
|
|
FreeModule(lib);
|
|
lib = NULL;
|
|
}
|
|
|
|
static bool init_lib(void)
|
|
{
|
|
if (lib)
|
|
return true;
|
|
|
|
lib = LoadLibrary(LIB_NAME);
|
|
if (!lib)
|
|
return false;
|
|
|
|
pxanew = SYM(new);
|
|
pxawrite = SYM(write);
|
|
pxawrite_avail = SYM(write_avail);
|
|
pxafree = SYM(free);
|
|
|
|
if (!pxanew || !pxawrite || !pxawrite_avail || !pxafree)
|
|
{
|
|
deinit_lib();
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Interesting hack from http://www-graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
|
|
static inline uint32_t next_pow2(uint32_t v)
|
|
{
|
|
v--;
|
|
v |= v >> 1;
|
|
v |= v >> 2;
|
|
v |= v >> 4;
|
|
v |= v >> 8;
|
|
v |= v >> 16;
|
|
v++;
|
|
return v;
|
|
}
|
|
|
|
static void* __xa_init(const char* device, int rate, int latency)
|
|
{
|
|
if (!init_lib())
|
|
return NULL;
|
|
|
|
xa_t *xa = calloc(1, sizeof(xa_t));
|
|
if (xa == NULL)
|
|
return NULL;
|
|
|
|
size_t bufsize = latency * rate / 1000;
|
|
bufsize = next_pow2(bufsize);
|
|
|
|
SSNES_LOG("XAudio2: Requesting %d ms latency, using %d ms latency.\n", latency, (int)bufsize * 1000 / rate);
|
|
|
|
xa->xa = pxanew(rate, 2, 16, bufsize << 2);
|
|
if (!xa->xa)
|
|
{
|
|
SSNES_ERR("Failed to init XAudio2.\n");
|
|
free(xa);
|
|
return NULL;
|
|
}
|
|
return xa;
|
|
}
|
|
|
|
static ssize_t __xa_write(void* data, const void* buf, size_t size)
|
|
{
|
|
xa_t *xa = data;
|
|
if (xa->nonblock)
|
|
{
|
|
size_t avail = pxawrite_avail(xa->xa);
|
|
if (avail < size)
|
|
size = avail;
|
|
}
|
|
return pxawrite(xa->xa, buf, size);
|
|
}
|
|
|
|
static bool __xa_stop(void *data)
|
|
{
|
|
(void)data;
|
|
return true;
|
|
}
|
|
|
|
static void __xa_set_nonblock_state(void *data, bool state)
|
|
{
|
|
xa_t *xa = data;
|
|
xa->nonblock = state;
|
|
}
|
|
|
|
static bool __xa_start(void *data)
|
|
{
|
|
(void)data;
|
|
return true;
|
|
}
|
|
|
|
static void __xa_free(void *data)
|
|
{
|
|
xa_t *xa = data;
|
|
if (xa && xa->xa)
|
|
{
|
|
if (pxafree)
|
|
pxafree(xa->xa);
|
|
free(xa);
|
|
}
|
|
deinit_lib();
|
|
}
|
|
|
|
const audio_driver_t audio_xa = {
|
|
.init = __xa_init,
|
|
.write = __xa_write,
|
|
.stop = __xa_stop,
|
|
.start = __xa_start,
|
|
.set_nonblock_state = __xa_set_nonblock_state,
|
|
.free = __xa_free,
|
|
.ident = "xaudio"
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
|