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115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010-2011 - Hans-Kristian Arntzen
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*
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* Some code herein may be based on code found in BSNES.
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*
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* SSNES is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with SSNES.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "driver.h"
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#include <stdlib.h>
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#include "xaudio-c/xaudio-c.h"
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#include "general.h"
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typedef struct
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{
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xaudio2_t *xa;
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bool nonblock;
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} xa_t;
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static void *xa_init(const char *device, unsigned rate, unsigned latency)
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{
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if (latency < 8)
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latency = 8; // Do not allow shenanigans.
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xa_t *xa = calloc(1, sizeof(xa_t));
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if (xa == NULL)
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return NULL;
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size_t bufsize = latency * rate / 1000;
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SSNES_LOG("XAudio2: Requesting %d ms latency, using %d ms latency.\n", latency, (int)bufsize * 1000 / rate);
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xa->xa = xaudio2_new(rate, 2, bufsize * 2 * sizeof(float));
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if (!xa->xa)
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{
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SSNES_ERR("Failed to init XAudio2.\n");
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free(xa);
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return NULL;
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}
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return xa;
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}
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static ssize_t xa_write(void *data, const void *buf, size_t size)
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{
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xa_t *xa = data;
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if (xa->nonblock)
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{
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size_t avail = xaudio2_write_avail(xa->xa);
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if (avail == 0)
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return 0;
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if (avail < size)
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size = avail;
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}
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size_t ret = xaudio2_write(xa->xa, buf, size);
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if (ret == 0)
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return -1;
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return ret;
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}
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static bool xa_stop(void *data)
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{
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(void)data;
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return true;
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}
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static void xa_set_nonblock_state(void *data, bool state)
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{
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xa_t *xa = data;
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xa->nonblock = state;
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}
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static bool xa_start(void *data)
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{
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(void)data;
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return true;
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}
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static bool xa_use_float(void *data)
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{
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(void)data;
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return true;
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}
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static void xa_free(void *data)
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{
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xa_t *xa = data;
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if (xa)
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{
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if (xa->xa)
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xaudio2_free(xa->xa);
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free(xa);
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}
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}
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const audio_driver_t audio_xa = {
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.init = xa_init,
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.write = xa_write,
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.stop = xa_stop,
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.start = xa_start,
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.set_nonblock_state = xa_set_nonblock_state,
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.use_float = xa_use_float,
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.free = xa_free,
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.ident = "xaudio"
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};
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