mirror of
https://github.com/libretro/RetroArch
synced 2024-12-29 12:31:05 +00:00
143 lines
2.9 KiB
C
143 lines
2.9 KiB
C
/* SSNES - A Super Ninteno Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010 - 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 <sys/soundcard.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <errno.h>
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static void* __oss_init(const char* device, int rate, int latency)
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{
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int *fd = calloc(1, sizeof(int));
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if ( fd == NULL )
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return NULL;
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const char *oss_device = "/dev/dsp";
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if ( device != NULL )
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oss_device = device;
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if ( (*fd = open(oss_device, O_WRONLY)) < 0 )
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{
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free(fd);
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return NULL;
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}
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int frags = (latency * rate * 4)/(1000 * (1 << 9));
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int frag = (frags << 16) | 9;
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if ( ioctl(*fd, SNDCTL_DSP_SETFRAGMENT, &frag) < 0 )
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{
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close(*fd);
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free(fd);
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return NULL;
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}
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int channels = 2;
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int format = AFMT_S16_LE;
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if ( ioctl(*fd, SNDCTL_DSP_CHANNELS, &channels) < 0 )
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{
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close(*fd);
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free(fd);
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return NULL;
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}
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if ( ioctl(*fd, SNDCTL_DSP_SETFMT, &format) < 0 )
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{
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close(*fd);
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free(fd);
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return NULL;
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}
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if ( ioctl(*fd, SNDCTL_DSP_SPEED, &rate) < 0 )
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{
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close(*fd);
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free(fd);
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return NULL;
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}
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return fd;
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}
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static ssize_t __oss_write(void* data, const void* buf, size_t size)
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{
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int *fd = data;
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if ( size == 0 )
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return 0;
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ssize_t ret;
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if ( (ret = write(*fd, buf, size)) <= 0 )
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{
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if ( (fcntl(*fd, F_GETFL) & O_NONBLOCK) && errno == EAGAIN )
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return 0;
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return -1;
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}
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return ret;
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}
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static bool __oss_stop(void *data)
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{
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int *fd = data;
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ioctl(*fd, SNDCTL_DSP_RESET, 0);
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return true;
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}
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static bool __oss_start(void *data)
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{
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return true;
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}
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static void __oss_set_nonblock_state(void *data, bool state)
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{
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int *fd = data;
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if (state)
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fcntl(*fd, F_SETFL, fcntl(*fd, F_GETFL) | O_NONBLOCK);
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else
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fcntl(*fd, F_SETFL, fcntl(*fd, F_GETFL) & (~O_NONBLOCK));
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}
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static void __oss_free(void *data)
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{
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int *fd = data;
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ioctl(*fd, SNDCTL_DSP_RESET, 0);
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close(*fd);
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free(fd);
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}
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const audio_driver_t audio_oss = {
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.init = __oss_init,
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.write = __oss_write,
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.stop = __oss_stop,
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.start = __oss_start,
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.set_nonblock_state = __oss_set_nonblock_state,
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.free = __oss_free
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};
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