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/*
* AdPlay/UNIX - OPL2 audio player
* Copyright (C) 2001 - 2003 Simon Peter <dn.tlp@gmx.net>
*
* This program 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 Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <unistd.h>
#include "sdl.h"
#include "defines.h"
SDLPlayer::SDLPlayer(Copl *nopl, unsigned char bits, int channels, int freq,
unsigned long bufsize)
: opl(nopl)
{
memset(&spec, 0x00, sizeof(SDL_AudioSpec));
if(SDL_Init(SDL_INIT_AUDIO) < 0) {
message(MSG_ERROR, "unable to initialize SDL -- %s", SDL_GetError());
exit(EXIT_FAILURE);
}
spec.freq = freq;
if(bits == 16) spec.format = AUDIO_S16SYS; else spec.format = AUDIO_U8;
spec.channels = channels;
spec.samples = bufsize;
spec.callback = SDLPlayer::callback;
spec.userdata = this;
if(SDL_OpenAudio(&spec, NULL) < 0) {
message(MSG_ERROR, "unable to open audio -- %s", SDL_GetError());
exit(EXIT_FAILURE);
}
message(MSG_DEBUG, "got audio buffer size -- %d", spec.size);
}
SDLPlayer::~SDLPlayer()
{
if(!SDL_WasInit(SDL_INIT_AUDIO)) return;
SDL_CloseAudio();
SDL_Quit();
}
void SDLPlayer::frame()
{
SDL_PauseAudio(0);
SDL_Delay(1000 * spec.freq / (spec.size / getsampsize()));
}
void SDLPlayer::callback(void *userdata, Uint8 *audiobuf, int len)
{
SDLPlayer *self = (SDLPlayer *)userdata;
static long minicnt = 0;
long i, towrite = len / self->getsampsize();
char *pos = (char *)audiobuf;
// Prepare audiobuf with emulator output
while(towrite > 0) {
while(minicnt < 0) {
minicnt += self->spec.freq;
self->playing = self->p->update();
}
i = std::min(towrite, (long)(minicnt / self->p->getrefresh() + 4) & ~3);
self->opl->update((short *)pos, i);
pos += i * self->getsampsize(); towrite -= i;
minicnt -= (long)(self->p->getrefresh() * i);
}
}
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