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fixed mp3 buffer overlapping of GP2X sound buffer

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@129 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-05-12 15:06:44 +00:00
parent d5d119243c
commit e362c57310
4 changed files with 32 additions and 20 deletions
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8
platform/gp2x/940ctl.c
View file

@ -29,7 +29,7 @@ static _940_data_t *shared_data = 0;
_940_ctl_t *shared_ctl = 0;
unsigned char *mp3_mem = 0;
#define MP3_SIZE_MAX (0x1000000 - 4*640*480)
#define MP3_SIZE_MAX (0x400000 + 0x800000) // 12M
int crashed_940 = 0;
@ -360,7 +360,7 @@ void sharedmem_init(void)
shared_data = (_940_data_t *) (shared_mem+0x100000);
/* this area must not get buffered on either side */
shared_ctl = (_940_ctl_t *) (shared_mem+0x200000);
mp3_mem = (unsigned char *) mmap(0, MP3_SIZE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x3000000);
mp3_mem = (unsigned char *) mmap(0, MP3_SIZE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x2400000);
if (mp3_mem == MAP_FAILED)
{
printf("mmap(mp3_mem) failed with %i\n", errno);
@ -599,7 +599,6 @@ void mp3_start_play(FILE *f, int pos) // pos is 0-1023
if (loaded_mp3 != f)
{
// printf("loading mp3... "); fflush(stdout);
if (PicoMessage != NULL)
{
fseek(f, 0, SEEK_END);
@ -608,8 +607,7 @@ void mp3_start_play(FILE *f, int pos) // pos is 0-1023
}
fseek(f, 0, SEEK_SET);
fread(mp3_mem, 1, MP3_SIZE_MAX, f);
// if (feof(f)) printf("done.\n");
// else printf("done. mp3 too large, not all data loaded.\n");
if (!feof(f)) printf("Warning: mp3 was too large, not all data loaded.\n");
shared_ctl->mp3_len = ftell(f);
loaded_mp3 = f;

2
platform/gp2x/code940/940.c
View file

@ -5,7 +5,7 @@
static _940_data_t *shared_data = (_940_data_t *) 0x00100000;
static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;
static unsigned char *mp3_data = (unsigned char *) 0x01000000;
static unsigned char *mp3_data = (unsigned char *) 0x00400000;
YM2612 *ym2612_940;
// from init.s

31
platform/gp2x/code940/940init.s
View file

@ -87,19 +87,25 @@ code940:
mcr p15, 0, r0, c6, c3, 0
mcr p15, 0, r0, c6, c3, 1
@ set up region 4: 16M 0x01000000-0x02000000 (mp3 area)
mov r0, #(0x17<<1)|1
orr r0, r0, #0x01000000
@ region 4: 4K 0x00000000-0x00001000 (boot code protection region)
mov r0, #(0x0b<<1)|1
mcr p15, 0, r0, c6, c4, 0
mcr p15, 0, r0, c6, c4, 1
@ region 5: 4K 0x00000000-0x00001000 (boot code protection region)
mov r0, #(0x0b<<1)|1
@ region 5: 4M 0x00400000-0x00800000 (mp3 area part1)
mov r0, #(0x15<<1)|1
orr r0, r0, #0x00400000
mcr p15, 0, r0, c6, c5, 0
mcr p15, 0, r0, c6, c5, 1
@ set regions 1, 4 and 5 to be cacheable (so the first 2M and mp3 area will be cacheable)
mov r0, #(1<<1)|(1<<4)|(1<<5)
@ region 6: 8M 0x00800000-0x01000000 (mp3 area part2)
mov r0, #(0x16<<1)|1
orr r0, r0, #0x00800000
mcr p15, 0, r0, c6, c6, 0
mcr p15, 0, r0, c6, c6, 1
@ set regions 1, 4, 5 and 6 to be cacheable (so the first 2M and mp3 area will be cacheable)
mov r0, #(1<<1)|(1<<4)|(1<<5)|(1<<6)
mcr p15, 0, r0, c2, c0, 0
mcr p15, 0, r0, c2, c0, 1
@ -108,12 +114,13 @@ code940:
mcr p15, 0, r0, c3, c0, 0
@ set access protection
@ data: [no, full, full, full, full, no access] for regions [5 4 3 2 1 0]
mov r0, #(0<<10)|(3<<8)|(3<<6)|(3<<4)|(3<<2)|(0)
@ data: [full, full, no, full, full, full, no access] for regions [6 5 4 3 2 1 0]
mov r0, # (3<<12)|(3<<10)|(0<<8)
orr r0, r0, #(3<<6)|(3<< 4)|(3<< 2)|(0<<0)
mcr p15, 0, r0, c5, c0, 0
@ instructions: [full, no access, no, no, full, no]
mov r0, #(0<< 6)|(0<<4)|(3<<2)|(0)
orr r0, r0, #(3<<10)|(0<<8)
@ instructions: [no, no, full, no, no, full, no]
mov r0, # (0<<12)|(0<<10)|(3<<8)
orr r0, r0, #(0<<6)|(0<< 4)|(3<< 2)|(0<<0)
mcr p15, 0, r0, c5, c0, 1
mrc p15, 0, r0, c1, c0, 0 @ fetch current control reg

11
platform/readme.txt
View file

@ -89,8 +89,8 @@ Other important stuff
Badly encoded mp3s can cause various kind of problems, like noises, incorrect
playback speeds, not repeating music or even prevent game from starting.
* Use lower bitrate for better performance (96 or 128kbps CBRs recommended).
* Due to internal implementation mp3s must not be larger that ~15MB
(15548416 bytes). Larger mp3s will not be fully loaded.
* Due to internal implementation mp3s must not be larger that 12MB
(12582912 bytes). Larger mp3s will not be fully loaded.
* RAM timings option is good for dualcore operation (it is disabled by
default because it doesn't work on every GP2X, so enable it in advanced
options).
@ -224,6 +224,13 @@ Symbian:
Changelog
---------
1.321
* Sometimes stray sounds were played after loading a savestate. Fixed.
* Fixed a problem where >6MB mp3s were corrupted in memory (sound glitches in
Snatcher).
* PD no longer overwrites video player code in memory, video player now can be
used after PicoDrive.
1.32
+ Added some new scaling options.
+ Added ability to reload CD images while game is running (needed for games