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119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010-2012 - 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 <stdbool.h>
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#include "../general.h"
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#include <xenon_sound/sound.h>
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#define SOUND_FREQUENCY 48000
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#define MAX_BUFFER 2048
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typedef struct
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{
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uint32_t buffer[2048];
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bool nonblock;
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} xenon_audio_t;
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static void *xenon360_init(const char *device, unsigned rate, unsigned latency)
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{
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static bool inited = false;
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if (!inited)
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{
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xenon_sound_init();
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inited = true;
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}
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g_settings.audio.out_rate = SOUND_FREQUENCY;
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return calloc(1, sizeof(xenon_audio_t));
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}
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static inline uint32_t bswap_32(uint32_t val)
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{
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return (val >> 24) | (val << 24) | ((val >> 8) & 0xff00) | ((val << 8) & 0xff0000);
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}
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static ssize_t xenon360_write(void *data, const void *buf, size_t size)
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{
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xenon_audio_t *xa = data;
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size_t written = 0;
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const uint32_t *in_buf = buf;
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for (size_t i = 0; i < (size >> 2); i++)
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xa->buffer[i] = bswap_32(in_buf[i]);
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if (!xa->nonblock)
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{
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while (xenon_sound_get_unplayed() >= MAX_BUFFER)
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{
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// libxenon doesn't have proper synchronization primitives for this :(
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udelay(50);
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}
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xenon_sound_submit(xa->buffer, size);
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written = size;
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}
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else
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{
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if (xenon_sound_get_unplayed() < MAX_BUFFER)
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{
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xenon_sound_submit(xa->buffer, size);
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written = size;
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}
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}
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return written;
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}
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static bool xenon360_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 xenon360_set_nonblock_state(void *data, bool state)
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{
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xenon_audio_t *xa = data;
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xa->nonblock = state;
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}
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static bool xenon360_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 void xenon360_free(void *data)
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{
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if (data)
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free(data);
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}
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const audio_driver_t audio_xenon360 = {
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.init = xenon360_init,
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.write = xenon360_write,
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.stop = xenon360_stop,
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.start = xenon360_start,
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.set_nonblock_state = xenon360_set_nonblock_state,
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.free = xenon360_free,
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.ident = "xenon360"
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};
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