timidity.c

SDL_mixer 是一个基于 SDL 的混音器

/*

    TiMidity -- Experimental MIDI to WAVE converter
    Copyright (C) 1995 Tuukka Toivonen <[e-mail]>

	 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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "SDL.h"
#include "config.h"
#include "common.h"
#include "instrum.h"
#include "playmidi.h"
#include "readmidi.h"
#include "output.h"
#include "ctrlmode.h"
#include "timidity.h"

#include "tables.h"

void (*s32tobuf)(void *dp, int32 *lp, int32 c);
int free_instruments_afterwards=0;
static char def_instr_name[256]="";

int AUDIO_BUFFER_SIZE;
resample_t *resample_buffer=NULL;
int32 *common_buffer=NULL;
int num_ochannels;

#define MAXWORDS 10

static int read_config_file(char *name)
{
  FILE *fp;
  char tmp[1024], *w[MAXWORDS], *cp;
  ToneBank *bank=0;
  int i, j, k, line=0, words;
  static int rcf_count=0;

  if (rcf_count>50)
   {
    ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
      "Probable source loop in configuration files");
    return (-1);
   }

  if (!(fp=open_file(name, 1, OF_VERBOSE)))
   return -1;

  while (fgets(tmp, sizeof(tmp), fp))
  {
    line++;
    w[words=0]=strtok(tmp, " \t\r\n\240");
    if (!w[0] || (*w[0]=='#')) continue;
    while (w[words] && (words < MAXWORDS))
      {
        w[++words]=strtok(0," \t\r\n\240");
        if (w[words] && w[words][0]=='#') break;
      }
    if (!strcmp(w[0], "map")) continue;
    if (!strcmp(w[0], "dir"))
    {
      if (words < 2)
       {
        ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
          "%s: line %d: No directory given\n", name, line);
        return -2;
       }
      for (i=1; i<words; i++)
        add_to_pathlist(w[i]);
    }
  else if (!strcmp(w[0], "source"))
  {
    if (words < 2)
      {
        ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
          "%s: line %d: No file name given\n", name, line);
        return -2;
     }
    for (i=1; i<words; i++)
      {
        rcf_count++;
      read_config_file(w[i]);
        rcf_count--;
      }
  }
      else if (!strcmp(w[0], "default"))
  {
    if (words != 2)
      {
        ctl->cmsg(CMSG_ERROR, VERB_NORMAL, 
        "%s: line %d: Must specify exactly one patch name\n",
          name, line);
        return -2;
      }
    strncpy(def_instr_name, w[1], 255);
    def_instr_name[255]='\0';
  }
    else if (!strcmp(w[0], "drumset"))
  {
    if (words < 2)
      {
        ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
          "%s: line %d: No drum set number given\n", 
          name, line);
      return -2;
      }
    i=atoi(w[1]);
    if (i<0 || i>127)
     {
        ctl->cmsg(CMSG_ERROR, VERB_NORMAL, 
          "%s: line %d: Drum set must be between 0 and 127\n",
        name, line);
        return -2;
     }
    if (!drumset[i])
      {
        drumset[i]=safe_malloc(sizeof(ToneBank));
      memset(drumset[i], 0, sizeof(ToneBank));
     }
    bank=drumset[i];
  }
    else if (!strcmp(w[0], "bank"))
  {
    if (words < 2)
     {
        ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
          "%s: line %d: No bank number given\n", 
        name, line);
        return -2;
     }
    i=atoi(w[1]);
    if (i<0 || i>127)
      {
        ctl->cmsg(CMSG_ERROR, VERB_NORMAL, 
          "%s: line %d: Tone bank must be between 0 and 127\n",
        name, line);
        return -2;
      }
    if (!tonebank[i])
     {
      tonebank[i]=safe_malloc(sizeof(ToneBank));
        memset(tonebank[i], 0, sizeof(ToneBank));
      }
    bank=tonebank[i];
  }
      else {
  if ((words < 2) || (*w[0] < '0' || *w[0] > '9'))
    {
     ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
        "%s: line %d: syntax error\n", name, line);
     return -2;
    }
  i=atoi(w[0]);
  if (i<0 || i>127)
    {
      ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
        "%s: line %d: Program must be between 0 and 127\n",
        name, line);
      return -2;
    }
  if (!bank)
    {
      ctl->cmsg(CMSG_ERROR, VERB_NORMAL, 
       "%s: line %d: Must specify tone bank or drum set "
        "before assignment\n",
        name, line);
     return -2;
    }
  if (bank->tone[i].name)
    free(bank->tone[i].name);
  strcpy((bank->tone[i].name=safe_malloc(strlen(w[1])+1)),w[1]);
  bank->tone[i].note=bank->tone[i].amp=bank->tone[i].pan=
    bank->tone[i].strip_loop=bank->tone[i].strip_envelope=
      bank->tone[i].strip_tail=-1;

  for (j=2; j<words; j++)
    {
      if (!(cp=strchr(w[j], '=')))
        {
    ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: line %d: bad patch option %s\n",
      name, line, w[j]);
    return -2;
        }
      *cp++=0;
      if (!strcmp(w[j], "amp"))
      {
    k=atoi(cp);
    if ((k<0 || k>MAX_AMPLIFICATION) || (*cp < '0' || *cp > '9'))
      {
       ctl->cmsg(CMSG_ERROR, VERB_NORMAL, 
          "%s: line %d: amplification must be between "
         "0 and %d\n", name, line, MAX_AMPLIFICATION);
       return -2;
      }
    bank->tone[i].amp=k;
        }
      else if (!strcmp(w[j], "note"))
        {
    k=atoi(cp);
    if ((k<0 || k>127) || (*cp < '0' || *cp > '9'))
      {
       ctl->cmsg(CMSG_ERROR, VERB_NORMAL, 
         "%s: line %d: note must be between 0 and 127\n",
          name, line);
        return -2;
      }
    bank->tone[i].note=k;
      }
     else if (!strcmp(w[j], "pan"))
      {
    if (!strcmp(cp, "center"))
      k=64;
    else if (!strcmp(cp, "left"))
      k=0;
    else if (!strcmp(cp, "right"))
      k=127;
    else
      k=((atoi(cp)+100) * 100) / 157;
    if ((k<0 || k>127) ||
       (k==0 && *cp!='-' && (*cp < '0' || *cp > '9')))
      {
       ctl->cmsg(CMSG_ERROR, VERB_NORMAL, 
         "%s: line %d: panning must be left, right, "
         "center, or between -100 and 100\n",
         name, line);
       return -2;
      }
    bank->tone[i].pan=k;
      }
     else if (!strcmp(w[j], "keep"))
      {
    if (!strcmp(cp, "env"))
      bank->tone[i].strip_envelope=0;
    else if (!strcmp(cp, "loop"))
      bank->tone[i].strip_loop=0;
    else
      {
        ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
          "%s: line %d: keep must be env or loop\n", name, line);
       return -2;
      }
      }
     else if (!strcmp(w[j], "strip"))
      {
    if (!strcmp(cp, "env"))
      bank->tone[i].strip_envelope=1;
    else if (!strcmp(cp, "loop"))
      bank->tone[i].strip_loop=1;
    else if (!strcmp(cp, "tail"))
      bank->tone[i].strip_tail=1;
    else
      {
       ctl->cmsg(CMSG_ERROR, VERB_NORMAL,
         "%s: line %d: strip must be env, loop, or tail\n",
         name, line);
       return -2;
      }
      }
     else
      {
    ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: line %d: bad patch option %s\n",
      name, line, w[j]);
    return -2;
      }
    }
    }
   }
  if (ferror(fp))
   {
    ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "Can't read from %s\n", name);
    close_file(fp);
    return -2;
   }
  close_file(fp);
  return 0;
}

int Timidity_Init(int rate, int format, int channels, int samples)
{
  if (read_config_file(CONFIG_FILE)<0) {
    if (read_config_file(CONFIG_FILE_ETC)<0) {
      if (read_config_file(CONFIG_FILE_ETC_TIMIDITY)<0) {
        return(-1);
      }
    }
  }

  if (channels < 1 || channels == 3 || channels == 5 || channels > 6) return(-1);

  num_ochannels = channels;

  /* Set play mode parameters */
  play_mode->rate = rate;
  play_mode->encoding = 0;
  if ( (format&0xFF) == 16 ) {
    play_mode->encoding |= PE_16BIT;
  }
  if ( (format&0x8000) ) {
    play_mode->encoding |= PE_SIGNED;
  }
  if ( channels == 1 ) {
    play_mode->encoding |= PE_MONO;
  } 
  switch (format) {
    case AUDIO_S8:
      s32tobuf = s32tos8;
      break;
    case AUDIO_U8:
      s32tobuf = s32tou8;
      break;
    case AUDIO_S16LSB:
      s32tobuf = s32tos16l;
      break;
    case AUDIO_S16MSB:
      s32tobuf = s32tos16b;
      break;
    case AUDIO_U16LSB:
      s32tobuf = s32tou16l;
      break;
    case AUDIO_U16MSB:
      s32tobuf = s32tou16b;
      break;
    default:
      ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "Unsupported audio format");
      return(-1);
  }
  AUDIO_BUFFER_SIZE = samples;

  /* Allocate memory for mixing (WARNING:  Memory leak!) */
  resample_buffer = safe_malloc(AUDIO_BUFFER_SIZE*sizeof(resample_t)+100);
  common_buffer = safe_malloc(AUDIO_BUFFER_SIZE*num_ochannels*sizeof(int32));

  init_tables();

  if (ctl->open(0, 0)) {
    ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "Couldn't open %s\n", ctl->id_name);
    return(-1);
  }

  if (!control_ratio) {
    control_ratio = play_mode->rate / CONTROLS_PER_SECOND;
    if(control_ratio<1)
      control_ratio=1;
    else if (control_ratio > MAX_CONTROL_RATIO)
      control_ratio=MAX_CONTROL_RATIO;
  }
  if (*def_instr_name)
    set_default_instrument(def_instr_name);
  return(0);
}

char timidity_error[1024] = "";
char *Timidity_Error(void)
{
  return(timidity_error);
}