parse.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

	else if (strcmp(token, "highpass")==0) {
	  argUsed=1;
	  gfp->highpassfreq =  (( 1000.0 * atof( nextArg ) ) + 0.5);
	  if (gfp->highpassfreq  < 1) {
	    fprintf(stderr,"Must specify highpass with --highpass freq, freq >= 0.001 kHz\n");
	    exit(1);
	  }
	}
	else if (strcmp(token, "highpass-width")==0) {
	  argUsed=1;
	  gfp->highpasswidth =  (( 1000.0 * atof( nextArg ) ) + 0.5);
	  if (gfp->highpasswidth  < 0) {
	    fprintf(stderr,"Must specify highpass width with --highpass-width freq, freq >= 0 kHz\n");
	    exit(1);
	  }
	}
	else if (strcmp(token, "cwlimit")==0) {
	  argUsed=1;
	  gfp->cwlimit =  atof( nextArg );
	  if (gfp->cwlimit <= 0 ) {
	    fprintf(stderr,"Must specify cwlimit in kHz\n");
	    exit(1);
	  }
	} /* some more GNU-ish options could be added
	   * version       => complete name, version and license info (normal exit)  
	   * quiet/silent  => no messages on screen
	   * brief         => few messages on screen (name, status report)
	   * verbose       => all infos to screen (brhist, internal flags/filters)
	   * o/output file => specifies output filename
	   * O             => stdout
	   * i/input file  => specifies input filename
	   * I             => stdin
	   */
	else if (strcmp(token, "help") ==0
	       ||strcmp(token, "usage")==0){
	  lame_help(gfp,programName);  /* doesn't return */
	}
	else if (strcmp(token, "preset")==0) {
	  argUsed=1;
	  if (strcmp(nextArg,"phone")==0)
	  { /* when making changes, please update help text too */
	    gfp->brate = 16; 
	    gfp->highpassfreq=260;
            gfp->highpasswidth=40; 
	    gfp->lowpassfreq=3700;
	    gfp->lowpasswidth=300;
	    gfp->VBR_q=5;
	    gfp->VBR_min_bitrate_kbps=8;
	    gfp->VBR_max_bitrate_kbps=56;
	    gfp->no_short_blocks=1;
	    gfp->out_samplerate =  16000;
	    gfp->mode = MPG_MD_MONO; 
	    gfp->mode_fixed = 1; 
	    gfp->quality = 5;
	  }
	  else if (strcmp(nextArg,"voice")==0)
	  { /* when making changes, please update help text too */
	    gfp->brate = 56; 
	    gfp->highpassfreq=100;  
	    gfp->highpasswidth=20;
	    gfp->lowpasswidth=2000;
	    gfp->lowpassfreq=11000;
	    gfp->VBR_q=4;
	    gfp->VBR_min_bitrate_kbps=8;
	    gfp->VBR_max_bitrate_kbps=96;
	    gfp->no_short_blocks=1;
	    gfp->mode = MPG_MD_MONO; 
	    gfp->mode_fixed = 1; 
	    gfp->out_samplerate =  24000; 
	    gfp->quality = 5;
	  }
	  else if (strcmp(nextArg,"fm")==0)
	  { /* when making changes, please update help text too */
	    gfp->brate = 96; 
            gfp->highpassfreq=30;
            gfp->highpasswidth=0;
            gfp->lowpassfreq=15000;
            gfp->lowpasswidth=0;
	    gfp->VBR_q=4;
	    gfp->VBR_min_bitrate_kbps=32;
	    gfp->VBR_max_bitrate_kbps=192;
	    gfp->mode = MPG_MD_JOINT_STEREO; 
	    gfp->mode_fixed = 1; 
	    /*gfp->out_samplerate =  32000; */ /* determined automatically based on bitrate & sample freq. */
	    gfp->quality = 5;
	  }
	  else if (strcmp(nextArg,"tape")==0)
	  { /* when making changes, please update help text too */
	    gfp->brate = 128; 
            gfp->highpassfreq=15;
            gfp->highpasswidth=15;
            gfp->lowpassfreq=17000;
            gfp->lowpasswidth=2000;
	    gfp->VBR_q=4;
	    gfp->VBR_min_bitrate_kbps=32;
	    gfp->VBR_max_bitrate_kbps=192;
	    gfp->mode = MPG_MD_JOINT_STEREO; 
	    gfp->mode_fixed = 1; 
	    gfp->quality = 5;
	  }
	  else if (strcmp(nextArg,"hifi")==0)
	  { /* when making changes, please update help text too */
	    gfp->brate = 160;            
	    gfp->highpassfreq=15;
            gfp->highpasswidth=15;
            gfp->lowpassfreq=20000;
            gfp->lowpasswidth=3000;
	    gfp->VBR_q=3;
	    gfp->VBR_min_bitrate_kbps=32;
	    gfp->VBR_max_bitrate_kbps=224;
	    gfp->mode = MPG_MD_JOINT_STEREO; 
	    gfp->mode_fixed = 1; 
	    gfp->quality = 2;
	  }
	  else if (strcmp(nextArg,"cd")==0)
	  { /* when making changes, please update help text too */
	    gfp->brate = 192;  
	    gfp->lowpassfreq=-1;
            gfp->highpassfreq=-1;
	    gfp->VBR_q=2;
	    gfp->VBR_min_bitrate_kbps=80;
	    gfp->VBR_max_bitrate_kbps=256;
	    gfp->mode = MPG_MD_STEREO; 
	    gfp->mode_fixed = 1; 
	    gfp->quality = 2;
	  }
	  else if (strcmp(nextArg,"studio")==0)
	  { /* when making changes, please update help text too */
	    gfp->brate = 256; 
	    gfp->lowpassfreq=-1;
            gfp->highpassfreq=-1;
	    gfp->VBR_q=0;
	    gfp->VBR_min_bitrate_kbps=112;
	    gfp->VBR_max_bitrate_kbps=320;
	    gfp->mode = MPG_MD_STEREO; 
	    gfp->mode_fixed = 1; 
	    gfp->quality = 2; /* should be 0, but does not work now */
	  }
	  else if (strcmp(nextArg,"help")==0)
	  {
	    lame_presets_info(gfp,programName);  /* doesn't return */
	  }
	  else
	    {
	      fprintf(stderr,"%s: --preset type, type must be phone, voice, fm, tape, hifi, cd or studio, not %s\n",
		      programName, nextArg);
	      exit(1);
	    }
	} /* --preset */
	else
	  {
	    fprintf(stderr,"%s: unrec option --%s\n",
		    programName, token);
	  }
	i += argUsed;
	
      } else  while( (c = *token++) ) {
	if(*token ) arg = token;
	else                             arg = nextArg;
	switch(c) {
	case 'm':        argUsed = 1;   gfp->mode_fixed = 1;
	  if (*arg == 's')
	    { gfp->mode = MPG_MD_STEREO; }
	  else if (*arg == 'd')
	    { gfp->mode = MPG_MD_DUAL_CHANNEL; }
	  else if (*arg == 'j')
	    { gfp->mode = MPG_MD_JOINT_STEREO; }
	  else if (*arg == 'f')
	    { gfp->mode = MPG_MD_JOINT_STEREO; gfp->force_ms=1; }
	  else if (*arg == 'm')
	    { gfp->mode = MPG_MD_MONO; }
	  else {
	    fprintf(stderr,"%s: -m mode must be s/d/j/f/m not %s\n",
		    programName, arg);
	    err = 1;
	  }
	  break;
	case 'V':        argUsed = 1;   gfp->VBR = 1;  
	  gfp->VBR_q = atoi(arg);
	  if (gfp->VBR_q <0) gfp->VBR_q=0;
	  if (gfp->VBR_q >9) gfp->VBR_q=9;
	  break;
	case 'q':        argUsed = 1; 
	  user_quality = atoi(arg);
	  if (user_quality<0) user_quality=0;
	  if (user_quality>9) user_quality=9;
	  break;
	case 's':
	  argUsed = 1;
	  srate = atof( arg );
	  /* samplerate = rint( 1000.0 * srate ); $A  */
	  gfp->in_samplerate =  (( 1000.0 * srate ) + 0.5);
	  break;
	case 'b':        
	  argUsed = 1;
	  gfp->brate = atoi(arg); 
	  gfp->VBR_min_bitrate_kbps=gfp->brate;
	  break;
	case 'B':        
	  argUsed = 1;
	  gfp->VBR_max_bitrate_kbps=atoi(arg); 
	  break;	
	case 't':  /* dont write VBR tag */
	  gfp->bWriteVbrTag=0;
	  break;
	case 'r':  /* force raw pcm input file */
#ifdef LIBSNDFILE
	  fprintf(stderr,"WARNING: libsndfile may ignore -r and perform fseek's on the input.\n");
	  fprintf(stderr,"Compile without libsndfile if this is a problem.\n");
#endif
	  gfp->input_format=sf_raw;
	  break;
	case 'x':  /* force byte swapping */
	  gfp->swapbytes=TRUE;
	  break;
	case 'p': /* (jo) error_protection: add crc16 information to stream */
	  gfp->error_protection = 1; 
	  break;
	case 'a': /* autoconvert input file from stereo to mono - for mono mp3 encoding */
	  autoconvert=1;
	  gfp->mode=MPG_MD_MONO;
	  gfp->mode_fixed=1;
	  break;
	case 'h': 
	  gfp->quality = 2;
	  break;
	case 'k': 
	  gfp->lowpassfreq=-1;
	  gfp->highpassfreq=-1;
	  break;
	case 'd': 
	  gfp->allow_diff_short = 1;
	  break;
	case 'v': 
	  gfp->VBR = 1; 
	  break;
	case 'S': 
	  gfp->silent = TRUE;
	  break;
	case 'X':        argUsed = 1;   gfp->experimentalX = 0;
	  if (*arg == '0')
	    { gfp->experimentalX=0; }
	  else if (*arg == '1')
	    { gfp->experimentalX=1; }
	  else if (*arg == '2')
	    { gfp->experimentalX=2; }
	  else if (*arg == '3')
	    { gfp->experimentalX=3; }
	  else if (*arg == '4')
	    { gfp->experimentalX=4; }
	  else if (*arg == '5')
	    { gfp->experimentalX=5; }
	  else if (*arg == '6')
	    { gfp->experimentalX=6; }
	  else {
	    fprintf(stderr,"%s: -X n must be 0-6, not %s\n",
		    programName, arg);
	    err = 1;
	  }
	  break;


	case 'Y': 
	  gfp->experimentalY = TRUE;
	  break;
	case 'Z': 
	  gfp->experimentalZ = TRUE;
	  break;
	case 'f': 
	  gfp->quality= 9;
	  break;
	case 'g': /* turn on gtk analysis */
#ifdef HAVEGTK
	  gfp->gtkflag = TRUE;
#else
	    fprintf(stderr,"LAME not compiled with GTK support, -g not supported.\n",
		    programName, arg);
#endif
	  break;

	case 'e':        argUsed = 1;
	  if (*arg == 'n')                    gfp->emphasis = 0;
	  else if (*arg == '5')               gfp->emphasis = 1;
	  else if (*arg == 'c')               gfp->emphasis = 3;
	  else {
	    fprintf(stderr,"%s: -e emp must be n/5/c not %s\n",
		    programName, arg);
	    err = 1;
	  }
	  break;
	case 'c':   gfp->copyright = 1; break;
	case 'o':   gfp->original  = 0; break;
	
	case '?':   lame_help(gfp,programName);  /* doesn't return */
	default:    fprintf(stderr,"%s: unrec option %c\n",
				programName, c);
	err = 1; break;
	}
	if(argUsed) {
	  if(arg == token)    token = "";   /* no more from token */
	  else                ++i;          /* skip arg we used */
	  arg = ""; argUsed = 0;
	}
      }
    } else {
      if(inPath[0] == '\0')       strncpy(inPath, argv[i], MAX_NAME_SIZE);
      else if(outPath[0] == '\0') strncpy(outPath, argv[i], MAX_NAME_SIZE);
      else {
	fprintf(stderr,"%s: excess arg %s\n", programName, argv[i]);
	err = 1;
      }
    }
  }  /* loop over args */



  if(err || inPath[0] == '\0') lame_usage(gfp,programName);  /* never returns */
  if (inPath[0]=='-') gfp->silent=1;  /* turn off status - it's broken for stdin */
  if(outPath[0] == '\0') {
    if (inPath[0]=='-') {
      /* if input is stdin, default output is stdout */
      strcpy(outPath,"-");
    }else {
      strncpy(outPath, inPath, MAX_NAME_SIZE - 4);
      strncat(outPath, ".mp3", 4 );
    }
  }
  /* some file options not allowed with stdout */
  if (outPath[0]=='-') {
    gfp->bWriteVbrTag=0; /* turn off VBR tag */
    if (id3tag.used) {
      id3tag.used=0;         /* turn of id3 tagging */
      fprintf(stderr,"id3tag ignored: id3 tagging not supported for stdout.\n");
    }
  }


  /* if user did not explicitly specify input is mp3, check file name */
  if (gfp->input_format != sf_mp3)
    if (!(strcmp((char *) &inPath[strlen(inPath)-4],".mp3")))
      gfp->input_format = sf_mp3;

#if !(defined HAVEMPGLIB || defined AMIGA_MPEGA)
  if (gfp->input_format == sf_mp3) {
    fprintf(stderr,"Error: libmp3lame not compiled with mp3 *decoding* support \n");
    exit(1);
  }
#endif
  /* default guess for number of channels */
  if (autoconvert) gfp->num_channels=2; 
  else if (gfp->mode == MPG_MD_MONO) gfp->num_channels=1;
  else gfp->num_channels=2;

  /* user specified a quality value.  override any defaults set above */
  if (user_quality)   gfp->quality=user_quality;

}



#endif