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cd: switch to CD drive emu code from genplus

Browse source 
same license, much cleaner code
This commit is contained in:
notaz 2013-10-06 21:08:07 +03:00
parent 3f23709ef3
commit 274fcc35aa
25 changed files with 1798 additions and 1824 deletions
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60
pico/sound/sound.c
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@ -132,8 +132,6 @@ void PsndRerate(int preserve_state)
// feed it back it's own registers, just like after loading state
memcpy(YM2612GetRegs(), state, 0x204);
ym2612_unpack_state();
if ((PicoAHW & PAHW_MCD) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
cdda_start_play();
}
if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state
@ -191,23 +189,19 @@ PICO_INTERNAL void PsndDoDAC(int line_to)
}
// cdda
static pm_file *cdda_stream = NULL;
static void cdda_raw_update(int *buffer, int length)
{
int ret, cdda_bytes, mult = 1;
if (cdda_stream == NULL)
return;
cdda_bytes = length*4;
if (PsndRate <= 22050 + 100) mult = 2;
if (PsndRate < 22050 - 100) mult = 4;
cdda_bytes *= mult;
ret = pm_read(cdda_out_buffer, cdda_bytes, cdda_stream);
ret = pm_read(cdda_out_buffer, cdda_bytes, Pico_mcd->cdda_stream);
if (ret < cdda_bytes) {
memset((char *)cdda_out_buffer + ret, 0, cdda_bytes - ret);
cdda_stream = NULL;
Pico_mcd->cdda_stream = NULL;
return;
}
@ -219,51 +213,24 @@ static void cdda_raw_update(int *buffer, int length)
}
}
PICO_INTERNAL void cdda_start_play(void)
void cdda_start_play(int lba_base, int lba_offset, int lb_len)
{
int lba_offset, index, lba_length, i;
elprintf(EL_STATUS, "cdda play track #%i", Pico_mcd->scd.Cur_Track);
index = Pico_mcd->scd.Cur_Track - 1;
lba_offset = Pico_mcd->scd.Cur_LBA - Track_to_LBA(index + 1);
if (lba_offset < 0) lba_offset = 0;
lba_offset += Pico_mcd->TOC.Tracks[index].Offset;
// find the actual file for this track
for (i = index; i > 0; i--)
if (Pico_mcd->TOC.Tracks[i].F != NULL) break;
if (Pico_mcd->TOC.Tracks[i].F == NULL) {
elprintf(EL_STATUS|EL_ANOMALY, "no track?!");
return;
}
if (Pico_mcd->TOC.Tracks[i].ftype == CT_MP3)
if (Pico_mcd->cdda_type == CT_MP3)
{
int pos1024 = 0;
lba_length = Pico_mcd->TOC.Tracks[i].Length;
for (i++; i < Pico_mcd->TOC.Last_Track; i++) {
if (Pico_mcd->TOC.Tracks[i].F != NULL) break;
lba_length += Pico_mcd->TOC.Tracks[i].Length;
}
if (lba_offset)
pos1024 = lba_offset * 1024 / lba_length;
pos1024 = lba_offset * 1024 / lb_len;
mp3_start_play(Pico_mcd->TOC.Tracks[index].F, pos1024);
mp3_start_play(Pico_mcd->cdda_stream, pos1024);
return;
}
cdda_stream = Pico_mcd->TOC.Tracks[i].F;
PicoCDBufferFlush(); // buffering relies on fp not being touched
pm_seek(cdda_stream, lba_offset * 2352, SEEK_SET);
if (Pico_mcd->TOC.Tracks[i].ftype == CT_WAV)
pm_seek(Pico_mcd->cdda_stream, (lba_base + lba_offset) * 2352, SEEK_SET);
if (Pico_mcd->cdda_type == CT_WAV)
{
// skip headers, assume it's 44kHz stereo uncompressed
pm_seek(cdda_stream, 44, SEEK_CUR);
pm_seek(Pico_mcd->cdda_stream, 44, SEEK_CUR);
}
}
@ -330,13 +297,12 @@ static int PsndRender(int offset, int length)
// CD: CDDA audio
// CD mode, cdda enabled, not data track, CDC is reading
if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_CDDA) &&
!(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_CDDA)
&& Pico_mcd->cdda_stream != NULL
&& !(Pico_mcd->s68k_regs[0x36] & 1))
{
// note: only 44, 22 and 11 kHz supported, with forced stereo
int index = Pico_mcd->scd.Cur_Track - 1;
if (Pico_mcd->TOC.Tracks[index].ftype == CT_MP3)
if (Pico_mcd->cdda_type == CT_MP3)
mp3_update(buf32, length, stereo);
else
cdda_raw_update(buf32, length);