text: /*
  ** music_cd.cpp
  **
  **---------------------------------------------------------------------------
  ** Copyright 1999-2003 Randy Heit
  ** All rights reserved.
  **
  ** Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions
  ** are met:
  **
  ** 1. Redistributions of source code must retain the above copyright
  **    notice, this list of conditions and the following disclaimer.
  ** 2. Redistributions in binary form must reproduce the above copyright
  **    notice, this list of conditions and the following disclaimer in the
  **    documentation and/or other materials provided with the distribution.
  ** 3. The name of the author may not be used to endorse or promote products
  **    derived from this software without specific prior written permission.
  **
  ** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  ** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  ** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  ** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  ** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  ** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  **---------------------------------------------------------------------------
  **
  */
  
  #include "zmusic/zmusic_internal.h"
  #include "zmusic/musinfo.h"
  
  #ifdef _WIN32
  
  #include "zmusic/m_swap.h"
  #include "win32/i_cd.h"
  
  
  // CD track/disk played through the multimedia system -----------------------
  
  class CDSong : public MusInfo
  {
  public:
  	CDSong(int track, int id);
  	~CDSong();
  	void Play(bool looping, int subsong);
  	void Pause();
  	void Resume();
  	void Stop();
  	bool IsPlaying();
  	bool IsValid() const { return m_Inited; }
  
  protected:
  	CDSong() : m_Inited(false) {}
  
  	int m_Track;
  	bool m_Inited;
  };
  
  // CD track on a specific disk played through the multimedia system ---------
  
  class CDDAFile : public CDSong
  {
  public:
  	CDDAFile(MusicIO::FileInterface* reader);
  };
  
  
  
  void CDSong::Play (bool looping, int subsong)
  {
  	m_Status = STATE_Stopped;
  	m_Looping = looping;
  	if (m_Track != 0 ? CD_Play (m_Track, looping) : CD_PlayCD (looping))
  	{
  		m_Status = STATE_Playing;
  	}
  }
  
  void CDSong::Pause ()
  {
  	if (m_Status == STATE_Playing)
  	{
  		CD_Pause ();
  		m_Status = STATE_Paused;
  	}
  }
  
  void CDSong::Resume ()
  {
  	if (m_Status == STATE_Paused)
  	{
  		if (CD_Resume ())
  			m_Status = STATE_Playing;
  	}
  }
  
  void CDSong::Stop ()
  {
  	if (m_Status != STATE_Stopped)
  	{
  		m_Status = STATE_Stopped;
  		CD_Stop ();
  	}
  }
  
  CDSong::~CDSong ()
  {
  	Stop ();
  	m_Inited = false;
  }
  
  CDSong::CDSong (int track, int id)
  {
  	bool success;
  
  	m_Inited = false;
  
  	if (id != 0)
  	{
  		success = CD_InitID (id);
  	}
  	else
  	{
  		success = CD_Init (-1);
  	}
  
  	if (success && (track == 0 || CD_CheckTrack (track)))
  	{
  		m_Inited = true;
  		m_Track = track;
  	}
  }
  
  bool CDSong::IsPlaying ()
  {
  	if (m_Status == STATE_Playing)
  	{
  		if (CD_GetMode () != CDMode_Play)
  		{
  			Stop ();
  		}
  	}
  	return m_Status != STATE_Stopped;
  }
  
  CDDAFile::CDDAFile (MusicIO::FileInterface* reader)
  	: CDSong ()
  {
  	uint32_t chunk;
  	uint16_t track;
  	uint32_t discid;
  	auto endpos = reader->tell() + reader->filelength() - 8;
  
  	// ZMusic_OpenSong already identified this as a CDDA file, so we
  	// just need to check the contents we're interested in.
  	reader->seek(12, SEEK_CUR);
  
  	while (reader->tell() < endpos)
  	{
          reader->read(&chunk, 4);
  		if (chunk != (('f')|(('m')<<8)|(('t')<<16)|((' ')<<24)))
  		{
              reader->read(&chunk, 4);
              reader->seek(LittleLong(chunk), SEEK_CUR);
  		}
  		else
  		{
              reader->seek(6, SEEK_CUR);
              reader->read(&track, 2);
              reader->read(&discid, 4);
  
  			if (CD_InitID (LittleLong(discid)) && CD_CheckTrack (LittleShort(track)))
  			{
  				m_Inited = true;
  				m_Track = track;
  			}
  			return;
  		}
  	}
  }
  
  MusInfo* CD_OpenSong(int track, int id)
  {
  	return new CDSong(track, id);
  }
  
  MusInfo* CDDA_OpenSong(MusicIO::FileInterface* reader)
  {
  	return new CDDAFile(reader);
  }
  
  #else
  
  MusInfo* CD_OpenSong(int track, int id)
  {
  	return nullptr;
  }
  
  MusInfo* CDDA_OpenSong(MusicIO::FileInterface* reader)
  {
  	return nullptr;
  }
  
  
  #endif
  