/*
 * soundvoc.c - Implementation of the Creative Voice VOC dump sound device
 *
 * Written by
 *  Marco van den Heuvel <blackystardust68@yahoo.com>
 *
 * This file is part of VICE, the Versatile Commodore Emulator.
 * See README for copyright notice.
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA.
 *
 */

#include "vice.h"

#include <stdio.h>

#include "sound.h"
#include "types.h"
#include "archdep.h"

#define VOC_MAX 0x6fc00c   /* taken from sound conversion program */

static FILE *voc_fd=NULL;
static int samples=0;
static int block_start=0;
static int extra_block=0;

static int voc_init(const char *param, int *speed, int *fragsize, int *fragnr, int *channels)
{
  /* VOC header. */
  BYTE header[26]="Creative Voice File\032\032\0\024\001\037\021";
  BYTE block_header[16]="\011sssrrrr\026c\004\0\0\0\0\0";
  DWORD sample_rate=*speed;

  voc_fd = fopen(param ? param : "vicesnd.voc", MODE_WRITE);
  if (!voc_fd)
    return 1;

  samples = 0;
  extra_block = 0;

  if (fwrite(header, 1, 26, voc_fd)!=26)
  {
    fclose(voc_fd);
    return 1;
  }

  block_start=ftell(voc_fd);

  /* Initialize header. */
  block_header[9]=(BYTE)(*channels & 0xff);
  block_header[4]=(BYTE)(sample_rate & 0xff);
  block_header[5]=(BYTE)((sample_rate >> 8) & 0xff);
  block_header[6]=(BYTE)((sample_rate >> 16) & 0xff);
  block_header[7]=(BYTE)((sample_rate >> 24) & 0xff);

  return (fwrite(block_header, 1, 16, voc_fd)!=16);
}

static int voc_write(SWORD *pbuf, size_t nr)
{
  BYTE rlen[3];

  /* VOC block header. */
  BYTE extra_block_header[] = "\002sss";

#ifdef WORDS_BIGENDIAN
  unsigned int i;

  /* Swap bytes on big endian machines. */
  for (i=0; i<nr; i++)
  {
    pbuf[i]=(((WORD)pbuf[i] & 0xff) << 8) | ((WORD)pbuf[i] >> 8);
  }
#endif

  if ((samples+(nr*2))>=(VOC_MAX-12))
  {
    if (extra_block==0)
    {
      rlen[0]=(BYTE)(((samples*2)+12) & 0xff);
      rlen[1]=(BYTE)((((samples*2)+12) >> 8) & 0xff);
      rlen[2]=(BYTE)((((samples*2)+12) >> 16) & 0xff);
      fseek(voc_fd, block_start+1, SEEK_SET);
      fwrite(rlen, 1, 3, voc_fd);
      fseek(voc_fd, 0, SEEK_END);
      block_start=ftell(voc_fd);
      fwrite(extra_block_header, 1, 4, voc_fd);
      samples=0;
      extra_block++;
    }
    else
    {
      rlen[0]=(BYTE)((samples*2) & 0xff);
      rlen[1]=(BYTE)(((samples*2) >> 8) & 0xff);
      rlen[2]=(BYTE)(((samples*2) >> 16) & 0xff);
      fseek(voc_fd, block_start+1, SEEK_SET);
      fwrite(rlen, 1, 3, voc_fd);
      fseek(voc_fd, 0, SEEK_END);
      block_start=ftell(voc_fd);
      fwrite(extra_block_header, 1, 4, voc_fd);
      samples=0;
    }
  }    

  if (nr!=fwrite(pbuf, sizeof(SWORD), nr, voc_fd))
    return 1;

  /* Swap the bytes back just in case. */
#ifdef WORDS_BIGENDIAN
  for (i=0; i<nr; i++)
  {
    pbuf[i]=(((WORD)pbuf[i] & 0xff) << 8) | ((WORD)pbuf[i] >> 8);
  }
#endif

  /* Accumulate number of samples. */
  samples+=(int)nr;

  return 0;
}

static void voc_close(void)
{
  BYTE rlen[3];

  rlen[0]=(BYTE)((samples*2) & 0xff);
  rlen[1]=(BYTE)(((samples*2) >> 8) & 0xff);
  rlen[2]=(BYTE)(((samples*2) >> 16) & 0xff);
  fseek(voc_fd, block_start+1, SEEK_SET);
  fwrite(rlen, 1, 3, voc_fd);
  fclose(voc_fd);
  voc_fd=NULL;
}

static sound_device_t voc_device =
{
  "voc",
  voc_init,
  voc_write,
  NULL,
  NULL,
  NULL,
  voc_close,
  NULL,
  NULL,
  0
};

int sound_init_voc_device(void)
{
  return sound_register_device(&voc_device);
}
