added handling for bad sram headers

[picodrive.git] / Pico / sound / sound.c

// This is part of Pico Library\r
\r
// (c) Copyright 2004 Dave, All rights reserved.\r
// (c) Copyright 2006,2007 notaz, All rights reserved.\r
// Free for non-commercial use.\r
\r
// For commercial use, separate licencing terms must be obtained.\r
\r
\r
#include <string.h>\r
#include "ym2612.h"\r
#include "sn76496.h"\r
\r
#include "../PicoInt.h"\r
#include "../cd/pcm.h"\r
#include "mix.h"\r
\r
// master int buffer to mix to\r
static int PsndBuffer[2*44100/50];\r
\r
// dac\r
static unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r
\r
// for Pico\r
int PsndRate=0;\r
int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r
int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60\r
int PsndLen_exc_cnt=0;\r
short *PsndOut=NULL; // PCM data buffer\r
\r
// sn76496\r
extern int *sn76496_regs;\r
\r
\r
static void dac_recalculate(void)\r
{\r
  int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;\r
\r
  if(PsndLen <= lines) {\r
    // shrinking algo\r
    dac_cnt = -PsndLen;\r
    len=1; pos=0;\r
    dac_info[225] = 1;\r
\r
    for(i=226; i != 225; i++) {\r
      if (i >= lines) i = 0;\r
      len = 0;\r
      if(dac_cnt < 0) {\r
        len=1;\r
        pos++;\r
        dac_cnt += lines;\r
      }\r
      dac_cnt -= PsndLen;\r
      dac_info[i] = (pos<<4)|len;\r
    }\r
  } else {\r
    // stretching\r
    dac_cnt = PsndLen;\r
    pos=0;\r
    for(i = 225; i != 224; i++) {\r
      if (i >= lines) i = 0;\r
      len=0;\r
      while(dac_cnt >= 0) {\r
        dac_cnt -= lines;\r
        len++;\r
      }\r
      if (i == mid) // midpoint\r
        while(pos+len < PsndLen/2) {\r
          dac_cnt -= lines;\r
          len++;\r
        }\r
      dac_cnt += PsndLen;\r
      dac_info[i] = (pos<<4)|len;\r
      pos+=len;\r
    }\r
    // last sample\r
    for(len = 0, i = pos; i < PsndLen; i++) len++;\r
    if (PsndLen_exc_add) len++;\r
    dac_info[224] = (pos<<4)|len;\r
  }\r
  //for(i=len=0; i < lines; i++) {\r
  //  printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);\r
  //  len+=dac_info[i]&0xf;\r
  //}\r
  //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));\r
  //printf("len total: %i, last pos: %i\n", len, pos);\r
  //exit(8);\r
}\r
\r
\r
PICO_INTERNAL void PsndReset(void)\r
{\r
  void *ym2612_regs;\r
\r
  // also clear the internal registers+addr line\r
  ym2612_regs = YM2612GetRegs();\r
  memset(ym2612_regs, 0, 0x200+4);\r
  z80startCycle = z80stopCycle = 0;\r
\r
  PsndRerate(0);\r
}\r
\r
\r
// to be called after changing sound rate or chips\r
void PsndRerate(int preserve_state)\r
{\r
  void *state = NULL;\r
  int target_fps = Pico.m.pal ? 50 : 60;\r
\r
  // not all rates are supported in MCD mode due to mp3 decoder limitations\r
  if (PicoMCD & 1) {\r
    if (PsndRate != 11025 && PsndRate != 22050 && PsndRate != 44100) PsndRate = 22050;\r
    PicoOpt |= 8; // force stereo\r
  }\r
\r
  if (preserve_state) {\r
    state = malloc(0x200);\r
    if (state == NULL) return;\r
    memcpy(state, YM2612GetRegs(), 0x200);\r
    if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r
      Pico_mcd->m.audio_offset = mp3_get_offset();\r
  }\r
  YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r
  if (preserve_state) {\r
    // feed it back it's own registers, just like after loading state\r
    memcpy(YM2612GetRegs(), state, 0x200);\r
    YM2612PicoStateLoad();\r
    if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r
      mp3_start_play(Pico_mcd->TOC.Tracks[Pico_mcd->m.audio_track].F, Pico_mcd->m.audio_offset);\r
  }\r
\r
  if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state\r
  SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r
  if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state\r
\r
  if (state)\r
    free(state);\r
\r
  // calculate PsndLen\r
  PsndLen=PsndRate / target_fps;\r
  PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;\r
  PsndLen_exc_cnt=0;\r
\r
  // recalculate dac info\r
  dac_recalculate();\r
\r
  if (PicoMCD & 1)\r
    pcm_set_rate(PsndRate);\r
\r
  // clear all buffers\r
  memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);\r
  if (PsndOut)\r
    PsndClear();\r
}\r
\r
\r
// This is called once per raster (aka line), but not necessarily for every line\r
PICO_INTERNAL void Psnd_timers_and_dac(int raster)\r
{\r
  int pos, len;\r
  int do_dac = PsndOut && (PicoOpt&1) && *ym2612_dacen;\r
//  int do_pcm = PsndOut && (PicoMCD&1) && (PicoOpt&0x400);\r
\r
  // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)\r
  YM2612PicoTick(1);\r
\r
  if (!do_dac /*&& !do_pcm*/) return;\r
\r
  pos=dac_info[raster], len=pos&0xf;\r
  if (!len) return;\r
\r
  pos>>=4;\r
\r
  if (do_dac) {\r
    short *d = PsndOut + pos*2;\r
    int dout = *ym2612_dacout;\r
    if(PicoOpt&8) {\r
      // some manual loop unrolling here :)\r
      d[0] = dout;\r
      if (len > 1) {\r
        d[2] = dout;\r
        if (len > 2)\r
          d[4] = dout;\r
      }\r
    } else {\r
      short *d = PsndOut + pos;\r
      d[0] = dout;\r
      if (len > 1) {\r
        d[1] = dout;\r
        if (len > 2)\r
          d[2] = dout;\r
      }\r
    }\r
  }\r
\r
#if 0\r
  if (do_pcm) {\r
    int *d = PsndBuffer;\r
    d += (PicoOpt&8) ? pos*2 : pos;\r
    pcm_update(d, len, 1);\r
  }\r
#endif\r
}\r
\r
\r
PICO_INTERNAL void PsndClear(void)\r
{\r
  int len = PsndLen;\r
  if (PsndLen_exc_add) len++;\r
  if (PicoOpt & 8)\r
    memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned\r
  else {\r
    short *out = PsndOut;\r
    if ((int)out & 2) { *out++ = 0; len--; }\r
    memset32((int *) out, 0, len/2);\r
    if (len & 1) out[len-1] = 0;\r
  }\r
}\r
\r
\r
PICO_INTERNAL int PsndRender(int offset, int length)\r
{\r
  int  buf32_updated = 0;\r
  int *buf32 = PsndBuffer+offset;\r
  int stereo = (PicoOpt & 8) >> 3;\r
  // emulating CD && PCM option enabled && PCM chip on && have enabled channels\r
  int do_pcm = (PicoMCD&1) && (PicoOpt&0x400) && (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;\r
  offset <<= stereo;\r
\r
  if (offset == 0) { // should happen once per frame\r
    // compensate for float part of PsndLen\r
    PsndLen_exc_cnt += PsndLen_exc_add;\r
    if (PsndLen_exc_cnt >= 0x10000) {\r
      PsndLen_exc_cnt -= 0x10000;\r
      length++;\r
    }\r
  }\r
\r
  // PSG\r
  if (PicoOpt & 2)\r
    SN76496Update(PsndOut+offset, length, stereo);\r
\r
  // Add in the stereo FM buffer\r
  if (PicoOpt & 1) {\r
    buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);\r
  } else\r
    memset32(buf32, 0, length<<stereo);\r
\r
//printf("active_chs: %02x\n", buf32_updated);\r
\r
  // CD: PCM sound\r
  if (do_pcm) {\r
    pcm_update(buf32, length, stereo);\r
    //buf32_updated = 1;\r
  }\r
\r
  // CD: CDDA audio\r
  // CD mode, cdda enabled, not data track, CDC is reading\r
  if ((PicoMCD & 1) && (PicoOpt & 0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))\r
    mp3_update(buf32, length, stereo);\r
\r
  // convert + limit to normal 16bit output\r
  if (stereo)\r
       mix_32_to_16l_stereo(PsndOut+offset, buf32, length);\r
  else mix_32_to_16_mono   (PsndOut+offset, buf32, length);\r
\r
  return length;\r
}\r
\r
\r
\r
#if defined(_USE_MZ80)\r
\r
// memhandlers for mz80 core\r
unsigned char mz80_read(UINT32 a,  struct MemoryReadByte *w)  { return z80_read(a); }\r
void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }\r
\r
// structures for mz80 core\r
static struct MemoryReadByte mz80_mem_read[]=\r
{\r
  {0x0000,0xffff,mz80_read},\r
  {(UINT32) -1,(UINT32) -1,NULL}\r
};\r
static struct MemoryWriteByte mz80_mem_write[]=\r
{\r
  {0x0000,0xffff,mz80_write},\r
  {(UINT32) -1,(UINT32) -1,NULL}\r
};\r
static struct z80PortRead mz80_io_read[] ={\r
  {(UINT16) -1,(UINT16) -1,NULL}\r
};\r
static struct z80PortWrite mz80_io_write[]={\r
  {(UINT16) -1,(UINT16) -1,NULL}\r
};\r
\r
int mz80_run(int cycles)\r
{\r
  int ticks_pre = mz80GetElapsedTicks(0);\r
  mz80exec(cycles);\r
  return mz80GetElapsedTicks(0) - ticks_pre;\r
}\r
\r
#elif defined(_USE_DRZ80)\r
\r
struct DrZ80 drZ80;\r
\r
static unsigned int DrZ80_rebasePC(unsigned short a)\r
{\r
  drZ80.Z80PC_BASE = (unsigned int) Pico.zram;\r
  return drZ80.Z80PC_BASE + a;\r
}\r
\r
static unsigned int DrZ80_rebaseSP(unsigned short a)\r
{\r
  drZ80.Z80SP_BASE = (unsigned int) Pico.zram;\r
  return drZ80.Z80SP_BASE + a;\r
}\r
\r
static void DrZ80_irq_callback()\r
{\r
  drZ80.Z80_IRQ = 0; // lower irq when accepted\r
}\r
#endif\r
\r
#if defined(_USE_DRZ80) || defined(_USE_CZ80)\r
static unsigned char z80_in(unsigned short p)\r
{\r
  elprintf(EL_ANOMALY, "Z80 port %04x read", p);\r
  return 0xff;\r
}\r
\r
static void z80_out(unsigned short p,unsigned char d)\r
{\r
  elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);\r
}\r
#endif\r
\r
\r
// z80 functionality wrappers\r
PICO_INTERNAL void z80_init(void)\r
{\r
#if defined(_USE_MZ80)\r
  struct mz80context z80;\r
\r
  // z80\r
  mz80init();\r
  // Modify the default context\r
  mz80GetContext(&z80);\r
\r
  // point mz80 stuff\r
  z80.z80Base=Pico.zram;\r
  z80.z80MemRead=mz80_mem_read;\r
  z80.z80MemWrite=mz80_mem_write;\r
  z80.z80IoRead=mz80_io_read;\r
  z80.z80IoWrite=mz80_io_write;\r
\r
  mz80SetContext(&z80);\r
\r
#elif defined(_USE_DRZ80)\r
  memset(&drZ80, 0, sizeof(struct DrZ80));\r
  drZ80.z80_rebasePC=DrZ80_rebasePC;\r
  drZ80.z80_rebaseSP=DrZ80_rebaseSP;\r
  drZ80.z80_read8   =z80_read;\r
  drZ80.z80_read16  =z80_read16;\r
  drZ80.z80_write8  =z80_write;\r
  drZ80.z80_write16 =z80_write16;\r
  drZ80.z80_in      =z80_in;\r
  drZ80.z80_out     =z80_out;\r
  drZ80.z80_irq_callback=DrZ80_irq_callback;\r
\r
#elif defined(_USE_CZ80)\r
  memset(&CZ80, 0, sizeof(CZ80));\r
  Cz80_Init(&CZ80);\r
  Cz80_Set_Fetch(&CZ80, 0x0000, 0x1fff, (UINT32)Pico.zram); // main RAM\r
  Cz80_Set_Fetch(&CZ80, 0x2000, 0x3fff, (UINT32)Pico.zram); // mirror\r
  Cz80_Set_ReadB(&CZ80, (UINT8 (*)(UINT32 address))z80_read); // unused (hacked in)\r
  Cz80_Set_WriteB(&CZ80, z80_write);\r
  Cz80_Set_INPort(&CZ80, z80_in);\r
  Cz80_Set_OUTPort(&CZ80, z80_out);\r
#endif\r
}\r
\r
PICO_INTERNAL void z80_reset(void)\r
{\r
#if defined(_USE_MZ80)\r
  mz80reset();\r
#elif defined(_USE_DRZ80)\r
  memset(&drZ80, 0, 0x54);\r
  drZ80.Z80F  = (1<<2);  // set ZFlag\r
  drZ80.Z80F2 = (1<<2);  // set ZFlag\r
  drZ80.Z80IX = 0xFFFF << 16;\r
  drZ80.Z80IY = 0xFFFF << 16;\r
  drZ80.Z80IM = 0; // 1?\r
  drZ80.Z80PC = drZ80.z80_rebasePC(0);\r
  drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?\r
#elif defined(_USE_CZ80)\r
  Cz80_Reset(&CZ80);\r
  Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);\r
  Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);\r
  Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);\r
#endif\r
  Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled\r
}\r
\r
\r
PICO_INTERNAL void z80_pack(unsigned char *data)\r
{\r
#if defined(_USE_MZ80)\r
  struct mz80context mz80;\r
  *(int *)data = 0x00005A6D; // "mZ"\r
  mz80GetContext(&mz80);\r
  memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers\r
#elif defined(_USE_DRZ80)\r
  *(int *)data = 0x015A7244; // "DrZ" v1\r
  drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r
  drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r
  memcpy(data+4, &drZ80, 0x54);\r
#elif defined(_USE_CZ80)\r
  *(int *)data = 0x00007a43; // "Cz"\r
  *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);\r
  memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);\r
#endif\r
}\r
\r
PICO_INTERNAL void z80_unpack(unsigned char *data)\r
{\r
#if defined(_USE_MZ80)\r
  if (*(int *)data == 0x00005A6D) { // "mZ" save?\r
    struct mz80context mz80;\r
    mz80GetContext(&mz80);\r
    memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);\r
    mz80SetContext(&mz80);\r
  } else {\r
    z80_reset();\r
    z80_int();\r
  }\r
#elif defined(_USE_DRZ80)\r
  if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?\r
    memcpy(&drZ80, data+4, 0x54);\r
    // update bases\r
    drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r
    drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r
  } else {\r
    z80_reset();\r
    drZ80.Z80IM = 1;\r
    z80_int(); // try to goto int handler, maybe we won't execute trash there?\r
  }\r
#elif defined(_USE_CZ80)\r
  if (*(int *)data == 0x00007a43) { // "Cz" save?\r
    memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);\r
    Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));\r
  } else {\r
    z80_reset();\r
    z80_int();\r
  }\r
#endif\r
}\r
\r
PICO_INTERNAL void z80_exit(void)\r
{\r
#if defined(_USE_MZ80)\r
  mz80shutdown();\r
#endif\r
}\r
\r
#if 1 // defined(__DEBUG_PRINT) || defined(__GP2X__) || defined(__GIZ__)\r
PICO_INTERNAL void z80_debug(char *dstr)\r
{\r
#if defined(_USE_DRZ80)\r
  sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);\r
#elif defined(_USE_CZ80)\r
  sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);\r
#endif\r
}\r
#endif\r