vplay.c

fix point版本的Ogg Vorbis decoder

              dsp_stereo = MODE_MONO;
            else if (dsp_stereo) {	/* want Stereo */
              /* shit, my MACRO dosn't work here */
#ifdef SOUND_VERSION
              if (ioctl(audio, SNDCTL_DSP_STEREO, &dsp_stereo) < 0) {
#else
              if (dsp_stereo != ioctl(audio, SNDCTL_DSP_STEREO, dsp_stereo)) { 
#endif
                dsp_stereo = MODE_MONO; 
                fprintf (stderr, "%s: can't play in Stereo; playing only one channel\n",
                         command);
                one_chn = 1;
              }
            }
            was_extended = 0;
          }
          set_dsp_speed (dsp_speed);
          break;
        case 2:			/* nothing to do, pure data */
#ifdef __STDC__
          d_printf ((stderr, "Voice continuation\n"));
#else /* __STDC__ */
          d_printf ("Voice continuation\n");
#endif /* __STDC__ */
          break;
        case 3:			/* a silence block, no data, only a count */
          sp = (u_short *)data; COUNT(sizeof(u_short));
          dsp_speed = (int)(*data); COUNT(1);
          dsp_speed = 1000000 / (256 - dsp_speed);
          sync_dsp();
          set_dsp_speed (dsp_speed);
          silence = ( ((u_long)*sp) * 1000) / dsp_speed; 
#ifdef __STDC__
          d_printf ((stderr, "Silence for %d ms\n", silence));
#else /* __STDC__ */
          d_printf ("Silence for %d ms\n", silence);
#endif /* __STDC__ */
          write_zeros (*sp);
          break;
        case 4:			/* a marker for syncronisation, no effect */
          sp = (u_short *)data; COUNT(sizeof(u_short));
#ifdef __STDC__
          d_printf ((stderr, "Marker %d\n", *sp)); 
#else /* __STDC__ */
          d_printf ("Marker %d\n", *sp); 
#endif /* __STDC__ */
          break;
        case 5:			/* ASCII text, we copy to stderr */
          output = 1;
#ifdef __STDC__
          d_printf ((stderr, "ASCII - text :\n"));
#else /* __STDC__ */
          d_printf ("ASCII - text :\n");
#endif /* __STDC__ */
          break; 
        case 6:			/* repeat marker, says repeatcount */
          /* my specs don't say it: maybe this can be recursive, but
             I don't think somebody use it */
          repeat = *(u_short *)data; COUNT(sizeof(u_short));
#ifdef __STDC__
          d_printf ((stderr, "Repeat loop %d times\n", repeat));
#else /* __STDC__ */
          d_printf ("Repeat loop %d times\n", repeat);
#endif /* __STDC__ */
          if (filepos >= 0)	/* if < 0, one seek fails, why test another */
            if ( (filepos = lseek (fd, 0, 1)) < 0 ) {
              fprintf(stderr, "%s: can't play loops; %s isn't seekable\n", 
                      command, name);
              repeat = 0;
            }
            else
              filepos -= in_buffer;	/* set filepos after repeat */
          else
            repeat = 0;
          break;
        case 7:			/* ok, lets repeat that be rewinding tape */
          if (repeat) {
            if (repeat != 0xFFFF) {
#ifdef __STDC__
              d_printf ((stderr, "Repeat loop %d\n", repeat));
#else /* __STDC__ */
              d_printf ("Repeat loop %d\n", repeat);
#endif /* __STDC__ */
              --repeat;
            }
            else
#ifdef __STDC__
              d_printf ((stderr, "Neverending loop\n"));
#else /* __STDC__ */
              d_printf ("Neverending loop\n");
#endif /* __STDC__ */
            lseek (fd, filepos, 0);
            in_buffer = 0;		/* clear the buffer */
            goto Fill_the_buffer;
          }
          else
#ifdef __STDC__
            d_printf ((stderr, "End repeat loop\n"));
#else /* __STDC__ */
            d_printf ("End repeat loop\n");
#endif /* __STDC__ */
          break;
        case 8:			/* the extension to play Stereo, I have SB 1.0 :-( */
          was_extended = 1;
          eb = (Ext_Block *)data; COUNT(sizeof(Ext_Block));
          dsp_speed = (int)(eb->tc);
          dsp_speed = 256000000L / (65536 - dsp_speed);
          dsp_stereo = eb->mode;
          if (dsp_stereo == MODE_STEREO) 
            dsp_speed = dsp_speed >> 1;
          if (eb->pack) {     /* /dev/dsp can't it */
            fprintf (stderr, "%s: can't play packed .voc files\n", command);
            return;
          }
#ifdef __STDC__
          d_printf ((stderr, "Extended block %s %d Hz\n", 
				(eb->mode ? "Stereo" : "Mono"), dsp_speed));
#else /* __STDC */
          d_printf ("Extended block %s %d Hz\n", 
				(eb->mode ? "Stereo" : "Mono"), dsp_speed);
#endif /* __STDC__ */
          break;
        default:
          fprintf (stderr, "%s: unknown blocktype %d. terminate.\n", 
                   command, bp->type);
          return;
      } 		/* switch (bp->type) */
    }			/* while (! nextblock)  */
    /* put nextblock data bytes to dsp */
    l = min (in_buffer, nextblock);
    if (l) {  
      if (output && !quiet_mode)
        write (2, data, l);	/* to stderr */
      else {
        real_l = one_chn ? one_channel(data, l, one_chn, 0) : l;
        if (write (audio, data, real_l) != real_l) {
          perror (AUDIO);
          exit(-1);
        }
      }
      COUNT(l);
    }
  }			/* while(1) */
}
/* that was a big one, perhaps somebody split it :-) */

/* setting the globals for playing raw data */
void init_raw_data(void)
{
  timelimit  = raw_info.timelimit;
  dsp_speed  = raw_info.dsp_speed;
  dsp_stereo = raw_info.dsp_stereo;
  samplesize = raw_info.samplesize;
}

/* calculate the data count to read from/to dsp */
u_long calc_count(void)
{
  u_long count;

  if (!timelimit)
    count = 0x7fffffff;
  else {
    count = timelimit * dsp_speed;
    if (dsp_stereo)
      count *= 2;
    if (samplesize != 8)
      count *= 2;
  }
  return count;
}

/* write a .VOC-header */ 
void start_voc(int fd, u_long cnt)
{
  VocHeader  vh;
  BlockType  bt;
  Voice_data vd;
  Ext_Block  eb;
 
  strncpy((char *)vh.magic,MAGIC_STRING,20);
  vh.magic[19] = 0x1A;
  vh.headerlen = sizeof(VocHeader);
  vh.version = ACTUAL_VERSION;
  vh.coded_ver = 0x1233 - ACTUAL_VERSION;

  write (fd, &vh, sizeof(VocHeader));

  if (dsp_stereo) {
    /* write a extended block */
    bt.type = 8;
    bt.datalen = 4;
    bt.datalen_m = bt.datalen_h = 0;
    write (fd, &bt, sizeof(BlockType));
    eb.tc = (u_short)(65536 - 256000000L / (dsp_speed << 1));
    eb.pack = 0;
    eb.mode = 1;
    write (fd, &eb, sizeof(Ext_Block));
  }
  bt.type = 1;
  cnt += sizeof(Voice_data);	/* Voice_data block follows */
  bt.datalen   = (u_char)  (cnt & 0xFF);
  bt.datalen_m = (u_char)( (cnt & 0xFF00) >> 8 );
  bt.datalen_h = (u_char)( (cnt & 0xFF0000) >> 16 );
  write (fd, &bt, sizeof(BlockType));
  vd.tc = (u_char)(256 - (1000000 / dsp_speed) );
  vd.pack = 0;
  write (fd, &vd, sizeof(Voice_data) );
} 

/* write a WAVE-header */
void start_wave(int fd, u_long cnt)
{
  WaveHeader wh;

  wh.main_chunk = RIFF;
  wh.length     = cnt + sizeof(WaveHeader) - 8; 
  wh.chunk_type = WAVE;
  wh.sub_chunk  = FMT;
  wh.sc_len     = 16;
  wh.format     = PCM_CODE;
  wh.modus      = dsp_stereo ? 2 : 1;
  wh.sample_fq  = dsp_speed;
  wh.byte_p_spl = (samplesize == 8) ? 1 : 2;
  wh.byte_p_sec = dsp_speed * wh.modus * wh.byte_p_spl;
  wh.bit_p_spl  = samplesize;
  wh.data_chunk = DATA;
  wh.data_length= cnt;
  write (fd, &wh, sizeof(WaveHeader));
}

/* closing .VOC */
void end_voc(int fd)
{
  char dummy = 0;		/* Write a Terminator */
  write (fd, &dummy, 1);
  if (fd != 1)
    close (fd);
}

void end_wave_raw(int fd)
{				/* only close output */
  if (fd != 1)
    close (fd);
}

/* playing/recording raw data, this proc handels WAVE files and
   recording .VOCs (as one block) */ 
void recplay (int fd, int loaded, u_long count, int rtype, char *name)
{
  int l, real_l;
  u_long c;
  char one_chn = 0;
  char to_8 = 0;
  int tmps;

  sync_dsp();
  if (!quiet_mode) {
    fprintf (stderr, "%s %s : ", 
             (direction == PLAY) ? "Playing" : "Recording",
             fmt_rec_table[rtype].what);
    if (samplesize != 8)
      fprintf(stderr, "%d bit, ", samplesize);
    fprintf (stderr, "Speed %d Hz ", dsp_speed);
    fprintf (stderr, "%s ...\n", dsp_stereo ? "Stereo" : "Mono");
  }
  tmps = samplesize;
  IOCTL(audio, SNDCTL_DSP_SAMPLESIZE, tmps);
  if (tmps != samplesize) {
    fprintf (stderr, "%s: unable to set %d bit sample size", 
             command, samplesize);
    if (samplesize == 16) {
      samplesize = 8;
      IOCTL(audio, SNDCTL_DSP_SAMPLESIZE, samplesize);
      if (samplesize != 8) {
        fprintf(stderr, "%s: unable to set 8 bit sample size!\n", command);
        exit (-1);
      }
      fprintf (stderr, "; playing 8 bit\n");
      to_8 = 1;
    }
    else {
      fprintf (stderr, "\n");
      exit (-1);
    }
  }
#ifdef SOUND_VERSION
  if (ioctl (audio, SNDCTL_DSP_STEREO, &dsp_stereo) < 0) {
#else  
  if (dsp_stereo != ioctl (audio, SNDCTL_DSP_STEREO, dsp_stereo) ) {
#endif
    if (direction == PLAY) {
      fprintf (stderr, "%s: can't play in Stereo; playing only one channel\n", 
               command);
      dsp_stereo = MODE_MONO;
      one_chn = 1;
    }
    else {
      fprintf (stderr, "%s: can't record in Stereo\n", command);
      exit (-1);
    }
  }
  set_dsp_speed (dsp_speed);
 
  if (direction == PLAY) {
    while (count) {
      c = count;

      if (c > abuf_size)
        c = abuf_size;

      if ((l = read (fd, (char *)audiobuf + loaded, c - loaded)) > 0) {
        l += loaded; loaded = 0;	/* correct the count; ugly but ... */
        real_l = (one_chn || to_8) ? one_channel(audiobuf, l, one_chn, to_8) : l;
        if (write (audio, (char *)audiobuf, real_l) != real_l) {
	  perror (AUDIO);
	  exit (-1);
	}
        count -= l;
      }
      else {
	if (l == -1) { 
	  perror (name);
          exit (-1);
        }
        count = 0;	/* Stop */
      }
    }			/* while (count) */
  }
  else {		/* we are recording */

    while (count) {
      c = count;
      if (c > abuf_size)
        c = abuf_size;

      if ((l = read (audio, (char *)audiobuf, c)) > 0) {
        if (write (fd, (char *)audiobuf, l) != l) {
	  perror (name);
	  exit (-1);
	}
        count -= l;
      }

      if (l == -1) {
        perror (AUDIO);
        exit (-1);
      }
    }			/* While count */
  }
}

/*
  let's play or record it (record_type says VOC/WAVE/raw)
*/
void record_play(char *name)
{
  int fd, ofs;

  if (direction == PLAY) {
 
    if (!name) {
      fd = 0;
      name = "stdin";
    }
    else if ((fd = open (name, O_RDONLY, 0)) == -1) {
      perror (name);
      exit (-1);
    }
    /* read the file header */
    read (fd, (char *)audiobuf, sizeof(VocHeader));
    if ( (ofs = test_vocfile (audiobuf) ) >= 0) 
      vplay (fd, ofs, name);
    else {
      /* read bytes for WAVE-header */
      read (fd,  (char *)audiobuf + sizeof(VocHeader), 
            sizeof(WaveHeader) - sizeof(VocHeader) );
      if (test_wavefile (audiobuf) >= 0)
        recplay (fd, 0, count, WAVE_FMT, name);
      else {
        /* should be raw data */
        init_raw_data();
        count = calc_count();
        recplay (fd, sizeof(WaveHeader), count, RAW_DATA, name);
      }
    }
    if (fd != 0)
      close(fd);
  }
  else {		/* recording ... */
    if (!name) {
      fd = 1;
      name = "stdout";
    }
    else {
      if ((fd = open (name, O_WRONLY | O_CREAT, 0666)) == -1) {
        perror (name);
        exit (-1);
      }
    }
    count = calc_count() & 0xFFFFFFFE;
    /* WAVE-file should be even (I'm not sure), but wasting one byte
       isn't a problem (this can only be in 8 bit mono) */
    if (fmt_rec_table[record_type].start)
      fmt_rec_table[record_type].start(fd, count);
    recplay (fd, 0, count, record_type, name);
    fmt_rec_table[record_type].end(fd);
  }
}