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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001-2005 The ScummVM project
* Copyright (C) 2002 Ph0x - GP32 Backend
* Copyright (C) 2003/2004 DJWillis - GP32 Backend
* Copyright (C) 2005 Won Star - GP32 Backend
*
* 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
* of the License, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Header$
*
*/
#include "stdafx.h"
#include "common/scummsys.h"
#include "gp32std.h"
#include "gp32std_sound.h"
#define GP32_TIMER_AUDIO_IDX 0
// Global variables
static volatile unsigned int frame = 0;
static volatile unsigned int *soundPos = 0;
static volatile int idx_buf;
static volatile unsigned int shiftVal = 0;
static void *buffer;
static GPSOUNDBUF soundBuf;
// This routine gets called by the timer interrupt and
// polls the current playing position within the buffer.
static void soundTimer() {
unsigned int t = (((unsigned int)(*soundPos) - (unsigned int)buffer) >> shiftVal) >= soundBuf.samples ? 1 : 0;
if (t != frame) {
unsigned int offs = ((frame == 1) ? (soundBuf.samples << shiftVal) : 0);
soundBuf.callback(soundBuf.userdata, (uint8 *)((unsigned int)buffer + offs), soundBuf.samples << shiftVal);
frame = t;
}
}
int gp_soundBufStart(GPSOUNDBUF *sb) {
int bufferSize = 0;
frame = 0;
// Copy the structure
memcpy(&soundBuf, sb, sizeof(GPSOUNDBUF));
// Calculate size of a single sample in bytes
// and a corresponding shift value
shiftVal = 0;
switch (soundBuf.freq) {
case PCM_S11:
break;
case PCM_S22:
break;
case PCM_S44:
shiftVal++;
break;
case PCM_M11:
break;
case PCM_M22:
break;
case PCM_M44:
shiftVal++;
break;
}
if (soundBuf.format == PCM_16BIT)
shiftVal++;
soundBuf.samplesize = 1 << shiftVal;
// Allocate memory for the playing buffer
bufferSize = soundBuf.samplesize * soundBuf.samples * 2;
buffer = malloc(bufferSize);
memset(buffer, 0, bufferSize);
// Set timer interrupt
if (GpTimerOptSet(GP32_TIMER_AUDIO_IDX, soundBuf.pollfreq, 0, soundTimer) == GPOS_ERR_ALREADY_USED) {
NP(" Timer is already used... kill timer");
GpTimerKill(GP32_TIMER_AUDIO_IDX);
}
GpTimerSet(GP32_TIMER_AUDIO_IDX);
// Start playing
GpPcmInit(soundBuf.freq, soundBuf.format);
GpPcmPlay((unsigned short *)buffer, bufferSize, 1);
GpPcmLock((unsigned short *)buffer, (int *)&idx_buf, (unsigned int *)&soundPos);
return 0;
}
void gp_soundBufStop() {
GpPcmStop();
GpPcmRemove((unsigned short *)buffer);
GpTimerKill(GP32_TIMER_AUDIO_IDX);
free(buffer);
}
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