nolibgs_hello_worlds/hello_xa/hello_xa.c
2021-07-23 20:37:08 +02:00

185 lines
6.8 KiB
C

// XA track playback example
// base on `psyq/addons/scee/CD/XAPLAYER`
// Refs : http://psx.arthus.net/code/XA/XATUT.pdf
// http://psx.arthus.net/code/XA/xatut.zip
// http://psx.arthus.net/code/XA/XA%20ADPCM%20documentation.txt
// based on Lameguy64's tutorial : http://lameguy64.net/svn/pstutorials/chapter1/1-display.html
#include <sys/types.h>
#include <stdio.h>
#include <libgte.h>
#include <libetc.h>
#include <libgpu.h>
// CD library
#include <libcd.h>
// SPU library
#include <libspu.h>
#define VMODE 0 // Video Mode : 0 : NTSC, 1: PAL
#define SCREENXRES 320 // Screen width
#define SCREENYRES 240 + (VMODE << 4) // Screen height : If VMODE is 0 = 240, if VMODE is 1 = 256
#define CENTERX SCREENXRES/2 // Center of screen on x
#define CENTERY SCREENYRES/2 // Center of screen on y
#define MARGINX 0 // margins for text display
#define MARGINY 32
#define FONTSIZE 8 * 7 // Text Field Height
DISPENV disp[2]; // Double buffered DISPENV and DRAWENV
DRAWENV draw[2];
short db = 0; // index of which buffer is used, values 0, 1
// SPU attributes
SpuCommonAttr spuSettings;
#define CD_SECTOR_SIZE 2048
// XA
// Sector offset for XA data 4: simple speed, 8: double speed
#define XA_SECTOR_OFFSET 4
// Number of XA files
#define XA_TRACKS 1
// Number of populated XA streams/channels in each XA file
#define INDEXES_IN_XA 1
#define TOTAL_TRACKS (XA_TRACKS*INDEXES_IN_XA)
typedef struct {
int start;
int end;
} XA_TRACK;
// Declare an array of XA_TRACK
XA_TRACK XATrack[XA_TRACKS];
// Name of file to load
static char * loadXA = "\\INTER8.XA;1";
CdlFILE XAPos = {0};
// Start and end position of XA data, in sectors
static int StartPos, EndPos;
// Current pos in file
static int CurPos = -1;
// Playback status : 0 not playing, 1 playing
static int gPlaying = 0;
// Current XA channel
static char channel = 0;
void init(void)
{
ResetGraph(0); // Initialize drawing engine with a complete reset (0)
SetDefDispEnv(&disp[0], 0, 0 , SCREENXRES, SCREENYRES); // Set display area for both &disp[0] and &disp[1]
SetDefDispEnv(&disp[1], 0, SCREENYRES, SCREENXRES, SCREENYRES); // &disp[0] is on top of &disp[1]
SetDefDrawEnv(&draw[0], 0, SCREENYRES, SCREENXRES, SCREENYRES); // Set draw for both &draw[0] and &draw[1]
SetDefDrawEnv(&draw[1], 0, 0 , SCREENXRES, SCREENYRES); // &draw[0] is below &draw[1]
// Set video mode
if (VMODE){ SetVideoMode(MODE_PAL);}
SetDispMask(1); // Display on screen
setRGB0(&draw[0], 50, 50, 50); // set color for first draw area
setRGB0(&draw[1], 50, 50, 50); // set color for second draw area
draw[0].isbg = 1; // set mask for draw areas. 1 means repainting the area with the RGB color each frame
draw[1].isbg = 1;
PutDispEnv(&disp[db]); // set the disp and draw environnments
PutDrawEnv(&draw[db]);
FntLoad(960, 0); // Load font to vram at 960,0(+128)
FntOpen(MARGINX, SCREENYRES - MARGINY - FONTSIZE, SCREENXRES - MARGINX * 2, FONTSIZE, 0, 280 ); // FntOpen(x, y, width, height, black_bg, max. nbr. chars
}
void display(void)
{
DrawSync(0); // Wait for all drawing to terminate
VSync(0); // Wait for the next vertical blank
PutDispEnv(&disp[db]); // set alternate disp and draw environnments
PutDrawEnv(&draw[db]);
db = !db; // flip db value (0 or 1)
}
int main(void)
{
// Init display
init();
// SPU setup
// Init Spu
SpuInit();
// Set master & CD volume to max
spuSettings.mask = (SPU_COMMON_MVOLL | SPU_COMMON_MVOLR | SPU_COMMON_CDVOLL | SPU_COMMON_CDVOLR | SPU_COMMON_CDMIX);
spuSettings.mvol.left = 0x6000;
spuSettings.mvol.right = 0x6000;
spuSettings.cd.volume.left = 0x6000;
spuSettings.cd.volume.right = 0x6000;
// Enable CD input ON
spuSettings.cd.mix = SPU_ON;
// Apply settings
SpuSetCommonAttr(&spuSettings);
// Set transfer mode
SpuSetTransferMode(SPU_TRANSFER_BY_DMA);
// Init CD system
CdInit();
// Optional : Set CD Attenuation volume
//
// CdlATV cd_vol;
// cd_vol.val0 = cd_vol.val1 = cd_vol.val2 = cd_vol.val3 = 0x40;
// CdMix(&cd_vol);
//
// Load XA file from cd
// Find XA file pos
CdSearchFile( &XAPos, loadXA);
XATrack[0].start = CdPosToInt(&XAPos.pos);
XATrack[0].end = XATrack[0].start + (XAPos.size/CD_SECTOR_SIZE) - 1;
StartPos = XATrack[0].start;
EndPos = XATrack[0].end;
// XA setup
u_char param[4];
// ORing the parameters we need to set ; drive speed, ADPCM play, Subheader filter, sector size
param[0] = CdlModeSpeed|CdlModeRT|CdlModeSF|CdlModeSize1;
// Issue primitive command to CD-ROM system (Blocking-type)
// Set the parameters above
CdControlB(CdlSetmode, param, 0);
// Pause at current pos
CdControlF(CdlPause,0);
// Set filter
// This specifies the file and channel number to actually read data from.
CdlFILTER filter;
// Use file 1, channel 0
filter.file = 1;
filter.chan = channel;
// Set filter
CdControlF(CdlSetfilter, (u_char *)&filter);
// Position of file on CD
CdlLOC loc;
// Set CurPos to StartPos
CurPos = StartPos;
while (1) // infinite loop
{
// Begin XA file playback
if (gPlaying == 0 && CurPos == StartPos){
// Convert sector number to CD position in min/second/frame and set CdlLOC accordingly.
CdIntToPos(StartPos, &loc);
// Send CDROM read command
CdControlF(CdlReadS, (u_char *)&loc);
// Set playing flag
gPlaying = 1;
}
// When endPos is reached, set playing flag to 0
if ((CurPos += XA_SECTOR_OFFSET) >= EndPos){
gPlaying = 0;
}
// If XA file end is reached, stop playback
if ( gPlaying == 0 && CurPos >= EndPos ){
// Stop XA playback
// Stop CD playback
CdControlF(CdlStop,0);
// Optional
// Reset parameters
// param[0] = CdlModeSpeed;
// Set CD mode
// CdControlB(CdlSetmode, param, 0);
// Switch to next channel and start play back
channel = !channel;
filter.chan = channel;
// Set filter
CdControlF(CdlSetfilter, (u_char *)&filter);
CurPos = StartPos;
}
FntPrint("Hello XA ! %d\n", VSync(-1));
FntPrint("Start, End Pos: %d %d\n", StartPos, EndPos);
FntPrint("Current Pos: %d\n", CurPos );
FntPrint("Playback status: %d\n", gPlaying );
FntFlush(-1); // Draw printe stream
display(); // Execute display()
}
return 0;
}