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sound.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2006 The ScummVM project
 *
 * Copyright (C) 1999-2001 Sarien Team
 *
 * 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: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/engines/agi/sound.cpp $
 * $Id: sound.cpp 22614 2006-05-24 19:51:37Z eriktorbjorn $
 *
 */

#include "common/stdafx.h"

#include "sound/mixer.h"

#include "agi/agi.h"

namespace Agi {

#define USE_INTERPOLATION
#define USE_CHORUS

/* TODO: add support for variable sampling rate in the output device
 */

#ifdef USE_IIGS_SOUND

/**
 * AGI engine sound envelope structure.
 */
struct sound_envelope {
      uint8 bp;
      uint8 inc_hi;
      uint8 inc_lo;
};

struct sound_wavelist {
      uint8 top;
      uint8 addr;
      uint8 size;
      uint8 mode;
      uint8 rel_hi;
      uint8 rel_lo;
};

struct sound_instrument {
      struct sound_envelope env[8];
      uint8 relseg;
      uint8 priority;
      uint8 bendrange;
      uint8 vibdepth;
      uint8 vibspeed;
      uint8 spare;
      uint8 wac;
      uint8 wbc;
      struct sound_wavelist wal[8];
      struct sound_wavelist wbl[8];
};

struct sound_iigs_sample {
      uint8 type_lo;
      uint8 type_hi;
      uint8 srate_lo;
      uint8 srate_hi;
      uint16 unknown[2];
      uint8 size_lo;
      uint8 size_hi;
      uint16 unknown2[13];
};

#if 0
static struct sound_instrument *instruments;
static int num_instruments;
static uint8 *wave;
#endif

#endif

static int playing;
static struct channel_info chn[NUM_CHANNELS];
static int endflag = -1;
static int playing_sound = -1;
static uint8 *song;
static uint8 env;

struct sound_driver *snd;

extern struct sound_driver sound_dummy;

static void stop_note(int i);
static void play_note(int i, int freq, int vol);


int16 *snd_buffer;
static int16 *waveform;

static int16 waveform_ramp[WAVEFORM_SIZE] = {
      0, 8, 16, 24, 32, 40, 48, 56,
      64, 72, 80, 88, 96, 104, 112, 120,
      128, 136, 144, 152, 160, 168, 176, 184,
      192, 200, 208, 216, 224, 232, 240, 255,
      0, -248, -240, -232, -224, -216, -208, -200,
      -192, -184, -176, -168, -160, -152, -144, -136,
      -128, -120, -112, -104, -96, -88, -80, -72,
      -64, -56, -48, -40, -32, -24, -16, -8     /* Ramp up */
};

static int16 waveform_square[WAVEFORM_SIZE] = {
      255, 230, 220, 220, 220, 220, 220, 220,
      220, 220, 220, 220, 220, 220, 220, 220,
      220, 220, 220, 220, 220, 220, 220, 220,
      220, 220, 220, 220, 220, 220, 220, 110,
      -255, -230, -220, -220, -220, -220, -220, -220,
      -220, -220, -220, -220, -220, -220, -220, -220,
      -220, -220, -220, -220, -220, -220, -220, -220,
      -220, -220, -220, -110, 0, 0, 0, 0  /* Square */
};

static int16 waveform_mac[WAVEFORM_SIZE] = {
      45, 110, 135, 161, 167, 173, 175, 176,
      156, 137, 123, 110, 91, 72, 35, -2,
      -60, -118, -142, -165, -170, -176, -177, -179,
      -177, -176, -164, -152, -117, -82, -17, 47,
      92, 137, 151, 166, 170, 173, 171, 169,
      151, 133, 116, 100, 72, 43, -7, -57,
      -99, -141, -156, -170, -174, -177, -178, -179,
      -175, -172, -165, -159, -137, -114, -67, -19
};

#ifdef USE_IIGS_SOUND

static uint16 period[] = {
      1024, 1085, 1149, 1218, 1290, 1367,
      1448, 1534, 1625, 1722, 1825, 1933
};

static struct agi_note play_sample[] = {
      {0xff, 0x7f, 0x18, 0x00, 0x7f},
      {0xff, 0xff, 0x00, 0x00, 0x00},
      {0xff, 0xff, 0x00, 0x00, 0x00},
      {0xff, 0xff, 0x00, 0x00, 0x00}
};

static int note_to_period(int note) {
      return 10 * (period[note % 12] >> (note / 12 - 3));
}

#endif                        /* USE_IIGS_SOUND */

void unload_sound(int resnum) {
      if (game.dir_sound[resnum].flags & RES_LOADED) {
            if (game.sounds[resnum].flags & SOUND_PLAYING)
                  /* FIXME: Stop playing */
                  ;

            /* Release RAW data for sound */
            free(game.sounds[resnum].rdata);
            game.sounds[resnum].rdata = NULL;
            game.dir_sound[resnum].flags &= ~RES_LOADED;
      }
}

void decode_sound(int resnum) {
#ifdef USE_IIGS_SOUND
      int type, size;
      int16 *buf;
      uint8 *src;
      struct sound_iigs_sample *smp;

      debugC(3, kDebugLevelSound, "(%d)", resnum);
      type = READ_LE_UINT16(game.sounds[resnum].rdata);

      if (type == AGI_SOUND_SAMPLE) {
            /* Convert sample data to 16 bit signed format
             */
            smp = (struct sound_iigs_sample *)game.sounds[resnum].rdata;
            size = ((int)smp->size_hi << 8) + smp->size_lo;
            src = (uint8 *) game.sounds[resnum].rdata;
            buf = (int16 *) calloc(1, 54 + (size << 1) + 100);    /* FIXME */
            memcpy(buf, src, 54);
            for (; size--; buf[size + 54] = ((int16) src[size + 54] - 0x80) << 4);  /* FIXME */
            game.sounds[resnum].rdata = (uint8 *) buf;
            free(src);
      }
#endif                        /* USE_IIGS_SOUND */
}

void start_sound(int resnum, int flag) {
      int i, type;
#ifdef USE_IIGS_SOUND
      struct sound_iigs_sample *smp;
#endif

      if (game.sounds[resnum].flags & SOUND_PLAYING)
            return;

      stop_sound();

      if (game.sounds[resnum].rdata == NULL)
            return;

      type = READ_LE_UINT16(game.sounds[resnum].rdata);

      if (type != AGI_SOUND_SAMPLE && type != AGI_SOUND_MIDI && type != AGI_SOUND_4CHN)
            return;

      game.sounds[resnum].flags |= SOUND_PLAYING;
      game.sounds[resnum].type = type;
      playing_sound = resnum;
      song = (uint8 *) game.sounds[resnum].rdata;

      switch (type) {
#ifdef USE_IIGS_SOUND
      case AGI_SOUND_SAMPLE:
            debugC(3, kDebugLevelSound, "IIGS sample");
            smp = (struct sound_iigs_sample *)game.sounds[resnum].rdata;
            for (i = 0; i < NUM_CHANNELS; i++) {
                  chn[i].type = type;
                  chn[i].flags = 0;
                  chn[i].ins = (int16 *) & game.sounds[resnum].rdata[54];
                  chn[i].size = ((int)smp->size_hi << 8) + smp->size_lo;
                  chn[i].ptr = &play_sample[i];
                  chn[i].timer = 0;
                  chn[i].vol = 0;
                  chn[i].end = 0;
            }
            break;
      case AGI_SOUND_MIDI:
            debugC(3, kDebugLevelSound, "IIGS MIDI sequence");

            for (i = 0; i < NUM_CHANNELS; i++) {
                  chn[i].type = type;
                  chn[i].flags = AGI_SOUND_LOOP | AGI_SOUND_ENVELOPE;
                  chn[i].ins = waveform;
                  chn[i].size = WAVEFORM_SIZE;
                  chn[i].vol = 0;
                  chn[i].end = 0;
            }

            chn[0].timer = *(song + 2);
            chn[0].ptr = (struct agi_note *)(song + 3);
            break;
#endif
      case AGI_SOUND_4CHN:
            /* Initialize channel info */
            for (i = 0; i < NUM_CHANNELS; i++) {
                  chn[i].type = type;
                  chn[i].flags = AGI_SOUND_LOOP;
                  if (env) {
                        chn[i].flags |= AGI_SOUND_ENVELOPE;
                        chn[i].adsr = AGI_SOUND_ENV_ATTACK;
                  }
                  chn[i].ins = waveform;
                  chn[i].size = WAVEFORM_SIZE;
                  chn[i].ptr = (struct agi_note *)(song + (song[i << 1] | (song[(i << 1) + 1] << 8)));
                  chn[i].timer = 0;
                  chn[i].vol = 0;
                  chn[i].end = 0;
            }
            break;
      }

      memset(snd_buffer, 0, BUFFER_SIZE << 1);
      endflag = flag;

      /* Nat Budin reports that the flag should be reset when sound starts
       */
      setflag(endflag, false);

      /* FIXME: should wait for sound time instead of setting the flag
       *        immediately
       */
      if (opt.nosound) {
            setflag(endflag, true);
            stop_sound();
      }
}

void stop_sound() {
      int i;

      endflag = -1;
      for (i = 0; i < NUM_CHANNELS; i++)
            stop_note(i);

      if (playing_sound != -1) {
            game.sounds[playing_sound].flags &= ~SOUND_PLAYING;
            playing_sound = -1;
      }
}

static int16 *buffer;

int init_sound() {
      int r = -1;

      buffer = snd_buffer = (int16 *) calloc(2, BUFFER_SIZE);

      env = false;

      switch (opt.soundemu) {
      case SOUND_EMU_NONE:
            waveform = waveform_ramp;
            env = true;
            break;
      case SOUND_EMU_AMIGA:
      case SOUND_EMU_PC:
            waveform = waveform_square;
            break;
      case SOUND_EMU_MAC:
            waveform = waveform_mac;
            break;
      }

      report("Initializing sound:\n");

      report("sound: envelopes ");
      if (env) {
            report("enabled (decay=%d, sustain=%d)\n", ENV_DECAY, ENV_SUSTAIN);
      } else {
            report("disabled\n");
      }

#ifdef USE_IIGS_SOUND
      /*load_instruments ("demo.sys"); */
#endif

      return r;
}

void deinit_sound(void) {
      debugC(3, kDebugLevelSound, "()");
      if (snd)
            snd->deinit();
      free(snd_buffer);
}

static void stop_note(int i) {
      chn[i].adsr = AGI_SOUND_ENV_RELEASE;

#ifdef USE_CHORUS
      /* Stop chorus ;) */
      if (chn[i].type == AGI_SOUND_4CHN &&
          opt.soundemu == SOUND_EMU_NONE && i < 3) {
            stop_note(i + 4);
      }
#endif

#ifdef __TURBOC__
      if (i == 0)
            nosound();
#endif
}

static void play_note(int i, int freq, int vol) {
      if (!getflag(F_sound_on))
            vol = 0;
      else if (vol && opt.soundemu == SOUND_EMU_PC)
            vol = 160;

      chn[i].phase = 0;
      chn[i].freq = freq;
      chn[i].vol = vol;
      chn[i].env = 0x10000;
      chn[i].adsr = AGI_SOUND_ENV_ATTACK;

#ifdef USE_CHORUS
      /* Add chorus ;) */
      if (chn[i].type == AGI_SOUND_4CHN &&
          opt.soundemu == SOUND_EMU_NONE && i < 3) {
            int newfreq = freq * 1007 / 1000;
            if (freq == newfreq)
                  newfreq++;
            play_note(i + 4, newfreq, vol * 2 / 3);
      }
#endif

#ifdef __TURBOC__
      if (i == 0)
            sound(freq);
#endif
}

#ifdef USE_IIGS_SOUND

void play_midi_sound() {
      uint8 *p;
      uint8 parm1, parm2;
      static uint8 cmd, ch;

      playing = 1;

      if (chn[0].timer > 0) {
            chn[0].timer -= 2;
            return;
      }

      p = (uint8 *) chn[0].ptr;

      if (*p & 0x80) {
            cmd = *p++;
            ch = cmd & 0x0f;
            cmd >>= 4;
      }

      switch (cmd) {
      case 0x08:
            parm1 = *p++;
            parm2 = *p++;
            if (ch < NUM_CHANNELS)
                  stop_note(ch);
            break;
      case 0x09:
            parm1 = *p++;
            parm2 = *p++;
            if (ch < NUM_CHANNELS)
                  play_note(ch, note_to_period(parm1), 127);
            break;
      case 0x0b:
            parm1 = *p++;
            parm2 = *p++;
            debugC(3, kDebugLevelSound, "controller %02x, ch %02x, val %02x", parm1, ch, parm2);
            break;
      case 0x0c:
            parm1 = *p++;
#if 0
            if (ch < NUM_CHANNELS) {
                  chn[ch].ins = (uint16 *) & wave[waveaddr[parm1]];
                  chn[ch].size = wavesize[parm1];
            }
            debugC(3, kDebugLevelSound, "set patch %02x (%d,%d), ch %02x",
                        parm1, waveaddr[parm1], wavesize[parm1], ch);
#endif
            break;
      }

      chn[0].timer = *p++;
      chn[0].ptr = (struct agi_note *)p;

      if (*p >= 0xfc) {
            debugC(3, kDebugLevelSound, "end of sequence");
            playing = 0;
            return;
      }
}

void play_sample_sound() {
      play_note(0, 11025 * 10, 200);
      playing = 1;
}

#endif                        /* USE_IIGS_SOUND */

void play_agi_sound() {
      int i, freq;

      for (playing = i = 0; i < (opt.soundemu == SOUND_EMU_PC ? 1 : 4); i++) {
            playing |= !chn[i].end;

            if (chn[i].end)
                  continue;

            if ((--chn[i].timer) <= 0) {
                  stop_note(i);
                  freq = ((chn[i].ptr->frq_0 & 0x3f) << 4) | (int)(chn[i].ptr->frq_1 & 0x0f);

                  if (freq) {
                        uint8 v = chn[i].ptr->vol & 0x0f;
                        play_note(i, freq * 10, v == 0xf ? 0 : 0xff - (v << 1));
                  }

                  chn[i].timer = ((int)chn[i].ptr->dur_hi << 8) | chn[i].ptr->dur_lo;

                  if (chn[i].timer == 0xffff) {
                        chn[i].end = 1;
                        chn[i].vol = 0;
                        chn[i].env = 0;
#ifdef USE_CHORUS
                        /* chorus */
                        if (chn[i].type == AGI_SOUND_4CHN && opt.soundemu == SOUND_EMU_NONE && i < 3) {
                              chn[i + 4].vol = 0;
                              chn[i + 4].env = 0;
                        }
#endif
                  }
                  chn[i].ptr++;
            }
      }
}

void play_sound() {
      int i;

      if (endflag == -1)
            return;

#ifdef USE_IIGS_SOUND
      if (chn[0].type == AGI_SOUND_MIDI) {
            /* play_midi_sound (); */
            playing = 0;
      } else if (chn[0].type == AGI_SOUND_SAMPLE) {
            play_sample_sound();
      } else
#endif
            play_agi_sound();

      if (!playing) {
            for (i = 0; i < NUM_CHANNELS; chn[i++].vol = 0);

            if (endflag != -1)
                  setflag(endflag, true);

            if (playing_sound != -1)
                  game.sounds[playing_sound].flags &= ~SOUND_PLAYING;
            playing_sound = -1;
            endflag = -1;
      }
}

uint32 mix_sound(void) {
      register int i, p;
      int16 *src;
      int c, b, m;

      memset(snd_buffer, 0, BUFFER_SIZE << 1);

      for (c = 0; c < NUM_CHANNELS; c++) {
            if (!chn[c].vol)
                  continue;

            m = chn[c].flags & AGI_SOUND_ENVELOPE ?
                chn[c].vol * chn[c].env >> 16 : chn[c].vol;

            if (chn[c].type != AGI_SOUND_4CHN || c != 3) {
                  src = chn[c].ins;

                  p = chn[c].phase;
                  for (i = 0; i < BUFFER_SIZE; i++) {
                        b = src[p >> 8];
#ifdef USE_INTERPOLATION
                        b += ((src[((p >> 8) + 1) % chn[c].size] - src[p >> 8]) * (p & 0xff)) >> 8;
#endif
                        snd_buffer[i] += (b * m) >> 4;

                        p += (uint32) 118600 *4 / chn[c].freq;

                        /* FIXME */
                        if (chn[c].flags & AGI_SOUND_LOOP) {
                              p %= chn[c].size << 8;
                        } else {
                              if (p >= chn[c].size << 8) {
                                    p = chn[c].vol = 0;
                                    chn[c].end = 1;
                                    break;
                              }
                        }

                  }
                  chn[c].phase = p;
            } else {
                  /* Add white noise */
                  for (i = 0; i < BUFFER_SIZE; i++) {
                        b = rnd->getRandomNumber(255) - 128;
                        snd_buffer[i] += (b * m) >> 4;
                  }
            }

            switch (chn[c].adsr) {
            case AGI_SOUND_ENV_ATTACK:
                  /* not implemented */
                  chn[c].adsr = AGI_SOUND_ENV_DECAY;
                  break;
            case AGI_SOUND_ENV_DECAY:
                  if (chn[c].env > chn[c].vol * ENV_SUSTAIN + ENV_DECAY) {
                        chn[c].env -= ENV_DECAY;
                  } else {
                        chn[c].env = chn[c].vol * ENV_SUSTAIN;
                        chn[c].adsr = AGI_SOUND_ENV_SUSTAIN;
                  }
                  break;
            case AGI_SOUND_ENV_SUSTAIN:
                  break;
            case AGI_SOUND_ENV_RELEASE:
                  if (chn[c].env >= ENV_RELEASE) {
                        chn[c].env -= ENV_RELEASE;
                  } else {
                        chn[c].env = 0;
                  }
            }
      }

      return BUFFER_SIZE;
}

#ifdef USE_IIGS_SOUND

#if 0
int load_instruments(char *fname) {
      Common::File fp;
      int i, j, k;
      struct sound_instrument ai;
      int num_wav;
      char *path;

      path = "sierrast";

      if (!fp.open(path))
            return err_BadFileOpen;
      report("Loading samples: %s\n", path);

      if ((wave = malloc(0x10000 * 2)) == NULL)
            return err_NotEnoughMemory;

      fp.read(wave, 0x10000);
      fp.close();
      for (i = 0x10000; i--;) {
            ((int16 *) wave)[i] = 2 * ((int16) wave[i] - 128);
      }

      fp = fopen("bla", "w");
      fwrite(wave, 2, 0x10000, fp);
      fclose(fp);

      report("Loading instruments: %s\n", path);

      if ((fp = fopen(path, "rb")) == NULL)
            return err_BadFileOpen;

      fseek(fp, 0x8469, SEEK_SET);

      for (num_wav = j = 0; j < 40; j++) {
            fread(&ai, 1, 32, fp);

            if (ai.env[0].bp > 0x7f)
                  break;

#if 0
            printf("Instrument %d loaded ----------------\n", j);
            printf("Envelope:\n");
            for (i = 0; i < 8; i++)
                  printf("[seg %d]: BP %02x Inc %04x\n", i, ai.env[i].bp,
                              ((int)ai.env[i].inc_hi << 8) | ai.env[i].inc_lo);
            printf("rel seg: %d, pri inc: %d, bend range: %d, vib dep: %d, "
                        "vib spd: %d\n", ai.relseg, ai.priority,
                        ai.bendrange, ai.vibdepth, ai.vibspeed);
            printf("A wave count: %d, B wave count: %d\n", ai.wac, ai.wbc);
#endif

            for (k = 0; k < ai.wac; k++, num_wav++) {
                  fread(&ai.wal[k], 1, 6, fp);
#if 0
                  printf("[A %d of %d] top: %02x, wave address: %02x, "
                              "size: %02x, mode: %02x, relPitch: %04x\n", k + 1,
                              ai.wac, ai.wal[k].top, ai.wal[k].addr, ai.wal[k].size,
                              ai.wal[k].mode, ((int)ai.wal[k].rel_hi << 8) | ai.wal[k].rel_lo);
#endif
            }

            for (k = 0; k < ai.wbc; k++, num_wav++) {
                  fread(&ai.wbl[k], 1, 6, fp);
#if 0
                  printf("[B %d of %d] top: %02x, wave address: %02x, "
                              "size: %02x, mode: %02x, relPitch: %04x\n", k + 1, ai.wbc,
                              ai.wbl[k].top, ai.wbl[k].addr, ai.wbl[k].size,
                              ai.wbl[k].mode, ((int)ai.wbl[k].rel_hi << 8) | ai.wbl[k].rel_lo);
#endif
            }
            waveaddr[j] = 256 * ai.wal[0].addr;
            wavesize[j] = 256 * (1 << ((ai.wal[0].size) & 0x07));
#if 1
            printf("%d addr = %d\n", j, waveaddr[j]);
            printf("   size = %d\n", wavesize[j]);
#endif
      }

      num_instruments = j;
      printf("%d Ensoniq 5503 instruments loaded. (%d waveforms)\n", num_instruments, num_wav);

      fclose(fp);

      return err_OK;
}

void unload_instruments() {
      free(instruments);
}
#endif

#endif                        /* USE_IIGS_SOUND */

static void fill_audio(void *udata, int16 * stream, uint len) {
      len <<= 2;

      uint32 p = 0;
      static uint32 n = 0, s = 0;

      debugC(5, kDebugLevelSound, "(%p, %p, %d)", (void *)udata, (void *)stream, len);
      memcpy(stream, (uint8 *) buffer + s, p = n);
      for (n = 0, len -= p; n < len; p += n, len -= n) {
            play_sound();
            n = mix_sound() << 1;
            if (len < n) {
                  memcpy((uint8 *) stream + p, buffer, len);
                  s = len;
                  n -= s;
                  return;
            } else {
                  memcpy((uint8 *) stream + p, buffer, n);
            }
      }
      play_sound();
      n = mix_sound() << 1;
      memcpy((uint8 *) stream + p, buffer, s = len);
      n -= s;
}

AGIMusic::AGIMusic(Audio::Mixer *pMixer) {
      _mixer = pMixer;
      _sampleRate = pMixer->getOutputRate();
      _mixer->setupPremix(this);
}

void AGIMusic::premixerCall(int16 *data, uint len) {
      Agi::fill_audio(NULL, data, len);
}

void AGIMusic::setVolume(uint8 volume) {
      // TODO
}

AGIMusic::~AGIMusic(void) {
      _mixer->setupPremix(NULL);
}

AGIMusic *g_agi_music;

} // End of namespace Agi

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