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voc.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2004 The ScummVM project
 *
 * 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.
 *
 * $Header: /cvsroot/scummvm/scummvm/sound/voc.cpp,v 1.23 2004/12/11 23:34:33 fingolfin Exp $
 *
 */

#include "stdafx.h"
#include "common/util.h"
#include "common/stream.h"

#include "sound/audiostream.h"
#include "sound/mixer.h"
#include "sound/voc.h"


int getSampleRateFromVOCRate(int vocSR) {
      if (vocSR == 0xa5 || vocSR == 0xa6) {
            return 11025;
      } else if (vocSR == 0xd2 || vocSR == 0xd3) {
            return 22050;
      } else {
            int sr = 1000000L / (256L - vocSR);
            // inexact sampling rates occur e.g. in the kitchen in Monkey Island,
            // very easy to reach right from the start of the game.
            //warning("inexact sample rate used: %i (0x%x)", sr, vocSR);
            return sr;
      }
}

byte *loadVOCFromStream(Common::ReadStream &stream, int &size, int &rate) {
      int loops, begin_loop, end_loop;
      return loadVOCFromStream(stream, size, rate, loops, begin_loop, end_loop);
}

byte *loadVOCFromStream(Common::ReadStream &stream, int &size, int &rate, int &loops, int &begin_loop, int &end_loop) {
      VocFileHeader fileHeader;

      if (stream.read(&fileHeader, 8) != 8)
            goto invalid;

      if (!memcmp(&fileHeader, "VTLK", 4)) {
            if (stream.read(&fileHeader, sizeof(VocFileHeader)) != sizeof(VocFileHeader))
                  goto invalid;
      } else if (!memcmp(&fileHeader, "Creative", 8)) {
            if (stream.read(((byte *)&fileHeader) + 8, sizeof(VocFileHeader) - 8) != sizeof(VocFileHeader) - 8)
                  goto invalid;
      } else {
      invalid:;
            warning("loadVOCFromStream: Invalid header");
            return NULL;
      }

      if (memcmp(fileHeader.desc, "Creative Voice File", 19) != 0)
            error("loadVOCFromStream: Invalid header");
      if (fileHeader.desc[19] != 0x1A)
            debug(3, "loadVOCFromStream: Partially invalid header");

      int32 offset = FROM_LE_16(fileHeader.datablock_offset);
      int16 version = FROM_LE_16(fileHeader.version);
      int16 code = FROM_LE_16(fileHeader.id);
      assert(offset == sizeof(VocFileHeader));
      // 0x100 is an invalid VOC version used by German version of DOTT (Disk) and
      // French version of Simon the Sorcerer 2 (CD)
      assert(version == 0x010A || version == 0x0114 || version == 0x0100);
      assert(code == ~version + 0x1234);

      int len;
      byte *ret_sound = 0;
      size = 0;
      begin_loop = 0;
      end_loop = 0;

      while ((code = stream.readByte())) {
            len = stream.readByte();
            len |= stream.readByte() << 8;
            len |= stream.readByte() << 16;

            switch(code) {
            case 1: {
                  int time_constant = stream.readByte();
                  int packing = stream.readByte();
                  len -= 2;
                  rate = getSampleRateFromVOCRate(time_constant);
                  debug(9, "VOC Data Block: %d, %d, %d", rate, packing, len);
                  if (packing == 0) {
                        if (size) {
                              ret_sound = (byte *)realloc(ret_sound, size + len);
                        } else {
                              ret_sound = (byte *)malloc(len);
                        }
                        stream.read(ret_sound + size, len);
                        size += len;
                        begin_loop = size;
                        end_loop = size;
                  } else {
                        warning("VOC file packing %d unsupported", packing);
                  }
                  } break;
            case 6:     // begin of loop
                  assert(len == 2);
                  loops = stream.readUint16LE();
                  break;
            case 7:     // end of loop
                  assert(len == 0);
                  break;
            default:
                  warning("Invalid code in VOC file : %d", code);
                  return ret_sound;
            }
      }
      debug(4, "VOC Data Size : %d", size);
      return ret_sound;
}

AudioStream *makeVOCStream(Common::ReadStream &stream) {
      int size, rate;
      byte *data = loadVOCFromStream(stream, size, rate);

      if (!data)
            return 0;

      return makeLinearInputStream(rate, SoundMixer::FLAG_AUTOFREE | SoundMixer::FLAG_UNSIGNED, data, size, 0, 0);
}


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