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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001-2006 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.
*
* $URL$
* $Id$
*
*/
#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 sampleshiftVal = soundBuf.samples << shiftVal;
unsigned int t = (((unsigned int)(*soundPos) - (unsigned int)buffer) >> shiftVal) >= soundBuf.samples ? 1 : 0;
if (t != frame) {
unsigned int offs = ((frame == 1) ? (sampleshiftVal) : 0);
//memset((uint8 *)buffer + offs, 0, sampleshiftVal);
soundBuf.callback(soundBuf.userdata, (uint8 *)((unsigned int)buffer + offs), sampleshiftVal);
frame = t;
{
// Play silence
register uint16 *d = (uint16 *)((uint8 *)buffer + offs); // alignment-safe
register uint32 max = (uint32)((uint8 *)buffer + offs + sampleshiftVal);
do {
*d++ ^= 0x8000; // 1
*d++ ^= 0x8000; // 2
*d++ ^= 0x8000; // 3
*d++ ^= 0x8000; // 4
*d++ ^= 0x8000; // 5
*d++ ^= 0x8000; // 6
*d++ ^= 0x8000; // 7
*d++ ^= 0x8000; // 8
*d++ ^= 0x8000; // 9
*d++ ^= 0x8000; // 10
*d++ ^= 0x8000; // 11
*d++ ^= 0x8000; // 12
*d++ ^= 0x8000; // 13
*d++ ^= 0x8000; // 14
*d++ ^= 0x8000; // 15
*d++ ^= 0x8000; // 16
*d++ ^= 0x8000; // 17
*d++ ^= 0x8000; // 18
*d++ ^= 0x8000; // 19
*d++ ^= 0x8000; // 20
*d++ ^= 0x8000; // 21
*d++ ^= 0x8000; // 22
*d++ ^= 0x8000; // 23
*d++ ^= 0x8000; // 24
*d++ ^= 0x8000; // 25
*d++ ^= 0x8000; // 26
*d++ ^= 0x8000; // 27
*d++ ^= 0x8000; // 28
*d++ ^= 0x8000; // 29
*d++ ^= 0x8000; // 30
*d++ ^= 0x8000; // 31
*d++ ^= 0x8000; // 32
} while ((uint32)d < max);
}
}
}
int gp_soundBufStart(GPSOUNDBUF *sb) {
int bufferSize = 0;
PCM_SR gpFreq = PCM_S11;
PCM_BIT gpFormat = PCM_16BIT;
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.format) {
case 8:
gpFormat = PCM_8BIT;
break;
case 16:
gpFormat = PCM_16BIT;
shiftVal++;
break;
}
switch (soundBuf.freq) {
case 11025:
if (soundBuf.channels == 2) {
gpFreq = PCM_S11;
shiftVal++;
} else
gpFreq = PCM_M11;
break;
case 22050:
if (soundBuf.channels == 2) {
gpFreq = PCM_S22;
shiftVal++;
} else
gpFreq = PCM_M22;
break;
case 44100:
if (soundBuf.channels == 2) {
gpFreq = PCM_S44;
shiftVal++;
} else
gpFreq = PCM_M44;
break;
}
soundBuf.samplesize = 1 << shiftVal;
// Allocate memory for the playing buffer
bufferSize = soundBuf.samplesize * soundBuf.samples * 2;
buffer = malloc(bufferSize);
// Clear the buffer
uint16 *tmpBuf = (uint16 *)buffer;
for (int i = 0; i < bufferSize / 2; i++)
tmpBuf[i] = 0x8000;
// Frequency of the timer interrupt which polls the playing position
// FIXME: This frequency should not be multiplied by 4.
soundBuf.pollfreq = 4 * (2 * soundBuf.freq) / soundBuf.samples;
// Set timer interrupt
if (GpTimerOptSet(GP32_TIMER_AUDIO_IDX, soundBuf.pollfreq, 0, soundTimer) == GPOS_ERR_ALREADY_USED) {
GPDEBUG(" Timer is already used... kill timer");
GpTimerKill(GP32_TIMER_AUDIO_IDX);
}
GpTimerSet(GP32_TIMER_AUDIO_IDX);
GpPcmInit(gpFreq, gpFormat);
GpPcmPlay((unsigned short *)buffer, bufferSize, 1);
GpPcmLock((unsigned short *)buffer, (int *)&idx_buf, (unsigned int *)&soundPos);
return 0;
}
void gp_soundBufStop() {
GpTimerKill(GP32_TIMER_AUDIO_IDX);
GpPcmStop();
GpPcmRemove((unsigned short *)buffer);
free(buffer);
}
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