cd.c

game duke3d source

	return readInfo->mediaChange.status;
}


byte CDAudio_GetVolume (void)
{
	return cdvolume;
}


// we set the volume to 0 first and then to the desired volume
// some cd-rom drivers seem to need it done this way

void CDAudio_SetVolume (byte volume)
{
	if (!initialized || !enabled)
		return;

	cdRequest->headerLength = 13;
	cdRequest->unit = 0;
	cdRequest->command = COMMAND_WRITE;
	cdRequest->status = 0;

	cdRequest->x.read.mediaDescriptor = 0;
	cdRequest->x.read.bufferOffset = readInfoOffset;
	cdRequest->x.read.bufferSegment = readInfoSegment;
	cdRequest->x.read.length = sizeof(struct audioChannelInfo_s);
	cdRequest->x.read.startSector = 0;
	cdRequest->x.read.volumeID = 0;

	readInfo->audioChannelInfo.code = WRITE_REQUEST_AUDIO_CHANNEL_INFO;
	readInfo->audioChannelInfo.channel0input = 0;
	readInfo->audioChannelInfo.channel0volume = 0;
	readInfo->audioChannelInfo.channel1input = 1;
	readInfo->audioChannelInfo.channel1volume = 0;
	readInfo->audioChannelInfo.channel2input = 2;
	readInfo->audioChannelInfo.channel2volume = 0;
	readInfo->audioChannelInfo.channel3input = 3;
	readInfo->audioChannelInfo.channel3volume = 0;

	regs.x.ax = 0x1510;
	regs.x.cx = cdrom;
	regs.x.es = cdRequestSegment;
	regs.x.bx = cdRequestOffset;
	dos_int86 (0x2f);

	readInfo->audioChannelInfo.channel0volume = volume;
	readInfo->audioChannelInfo.channel1volume = volume;

	regs.x.ax = 0x1510;
	regs.x.cx = cdrom;
	regs.x.es = cdRequestSegment;
	regs.x.bx = cdRequestOffset;
	dos_int86 (0x2f);

	cdvolume = volume;
}


void CDAudio_Play(byte track, qboolean looping)
{
	int		volume;

	if (!initialized || !enabled)
		return;
	
	if (!cd.valid)
		return;

	track = remap[track];

	if (playing)
	{
		if (playTrack == track)
			return;
		CDAudio_Stop();
	}

	playLooping = looping;

	if (track < cd.lowTrack || track > cd.highTrack)
	{
		Con_DPrintf("CDAudio_Play: Bad track number %u.\n", track);
		return;
	}

	playTrack = track;

	if (cd.track[track].isData)
	{
		Con_DPrintf("CDAudio_Play: Can not play data.\n");
		return;
	}

	volume = (int)(bgmvolume.value * 255.0);
	if (volume < 0)
	{
		Cvar_SetValue ("bgmvolume", 0.0);
		volume = 0;
	}
	else if (volume > 255)
	{
		Cvar_SetValue ("bgmvolume", 1.0);
		volume = 255;
	}
	CDAudio_SetVolume (volume);

	cdRequest->headerLength = 13;
	cdRequest->unit = 0;
	cdRequest->command = COMMAND_PLAY_AUDIO;
	cdRequest->status = 0;

	cdRequest->x.playAudio.addressingMode = ADDRESS_MODE_RED_BOOK;
	cdRequest->x.playAudio.startLocation = cd.track[track].start;
	cdRequest->x.playAudio.sectors = cd.track[track].length;

	regs.x.ax = 0x1510;
	regs.x.cx = cdrom;
	regs.x.es = cdRequestSegment;
	regs.x.bx = cdRequestOffset;
	dos_int86 (0x2f);

	if (cdRequest->status & STATUS_ERROR_BIT)
	{
		Con_DPrintf("CDAudio_Play: track %u failed\n", track);
		cd.valid = false;
		playing = false;
		return;
	}

	playing = true;
}


void CDAudio_Stop(void)
{
	if (!initialized || !enabled)
		return;
	
	cdRequest->headerLength = 13;
	cdRequest->unit = 0;
	cdRequest->command = COMMAND_STOP_AUDIO;
	cdRequest->status = 0;

	regs.x.ax = 0x1510;
	regs.x.cx = cdrom;
	regs.x.es = cdRequestSegment;
	regs.x.bx = cdRequestOffset;
	dos_int86 (0x2f);

	wasPlaying = playing;
	playing = false;
}


void CDAudio_Resume(void)
{
	if (!initialized || !enabled)
		return;
	
	if (!cd.valid)
		return;

	if (!wasPlaying)
		return;
	
	cdRequest->headerLength = 13;
	cdRequest->unit = 0;
	cdRequest->command = COMMAND_RESUME_AUDIO;
	cdRequest->status = 0;

	regs.x.ax = 0x1510;
	regs.x.cx = cdrom;
	regs.x.es = cdRequestSegment;
	regs.x.bx = cdRequestOffset;
	dos_int86 (0x2f);

	playing = true;
}


static void CD_f (void)
{
	char	*command;
	int		ret;
	int		n;
	int		startAddress;

	if (Cmd_Argc() < 2)
		return;

	command = Cmd_Argv (1);

	if (Q_strcasecmp(command, "on") == 0)
	{
		enabled = true;
		return;
	}

	if (Q_strcasecmp(command, "off") == 0)
	{
		if (playing)
			CDAudio_Stop();
		enabled = false;
		return;
	}

	if (Q_strcasecmp(command, "reset") == 0)
	{
		enabled = true;
		if (playing)
			CDAudio_Stop();
		for (n = 0; n < 256; n++)
			remap[n] = n;
		CDAudio_Reset();
		CDAudio_GetAudioDiskInfo();
		return;
	}

	if (Q_strcasecmp(command, "remap") == 0)
	{
		ret = Cmd_Argc() - 2;
		if (ret <= 0)
		{
			for (n = 1; n < 256; n++)
				if (remap[n] != n)
					Con_Printf("  %u -> %u\n", n, remap[n]);
			return;
		}
		for (n = 1; n <= ret; n++)
			remap[n] = Q_atoi(Cmd_Argv (n+1));
		return;
	}

	if (!cd.valid)
	{
		Con_Printf("No CD in player.\n");
		return;
	}

	if (Q_strcasecmp(command, "play") == 0)
	{
		CDAudio_Play(Q_atoi(Cmd_Argv (2)), false);
		return;
	}

	if (Q_strcasecmp(command, "loop") == 0)
	{
		CDAudio_Play(Q_atoi(Cmd_Argv (2)), true);
		return;
	}

	if (Q_strcasecmp(command, "stop") == 0)
	{
		CDAudio_Stop();
		return;
	}

	if (Q_strcasecmp(command, "resume") == 0)
	{
		CDAudio_Resume();
		return;
	}

	if (Q_strcasecmp(command, "eject") == 0)
	{
		if (playing)
			CDAudio_Stop();
		CDAudio_Eject();
		cd.valid = false;
		return;
	}

	if (Q_strcasecmp(command, "info") == 0)
	{
		Con_Printf("%u tracks\n", cd.highTrack - cd.lowTrack + 1);
		for (n = cd.lowTrack; n <= cd.highTrack; n++)
		{
			ret = CDAudio_GetAudioTrackInfo (n, &startAddress);
			Con_Printf("Track %2u: %s at %2u:%02u\n", n, ret ? "data " : "music", (startAddress >> 16) & 0xff, (startAddress >> 8) & 0xff);
		}
		if (playing)
			Con_Printf("Currently %s track %u\n", playLooping ? "looping" : "playing", playTrack);
		Con_Printf("Volume is %u\n", cdvolume);
		CDAudio_MediaChange();
		Con_Printf("Status %04x\n", cdRequest->status & 0xffff);
		return;
	}
}


void CDAudio_Update(void)
{
	int		ret;
	int		newVolume;
	static	double lastUpdate;

	if (!initialized || !enabled)
		return;

	if ((realtime - lastUpdate) < 0.25)
		return;
	lastUpdate = realtime;

	if (mediaCheck)
	{
		static	double lastCheck;

		if ((realtime - lastCheck) < 5.0)
			return;
		lastCheck = realtime;

		ret = CDAudio_MediaChange();
		if (ret == MEDIA_CHANGED)
		{
			Con_DPrintf("CDAudio: media changed\n");
			playing = false;
			wasPlaying = false;
			cd.valid = false;
			CDAudio_GetAudioDiskInfo();
			return;
		}
	}

	newVolume = (int)(bgmvolume.value * 255.0);
	if (newVolume != cdvolume)
	{
		if (newVolume < 0)
		{
			Cvar_SetValue ("bgmvolume", 0.0);
			newVolume = 0;
		}
		else if (newVolume > 255)
		{
			Cvar_SetValue ("bgmvolume", 1.0);
			newVolume = 255;
		}
		CDAudio_SetVolume (newVolume);
	}

	if (playing)
	{
		CDAudio_GetAudioStatus();
		if ((cdRequest->status & STATUS_BUSY_BIT) == 0)
		{
			playing = false;
			if (playLooping)
				CDAudio_Play(playTrack, true);
		}
	}
}


qboolean CDAudio_Playing(void)
{
	return playing;
}


int CDAudio_Init(void)
{
	char	*memory;
	int		n;

	if (cls.state == ca_dedicated)
		return -1;

	if (COM_CheckParm("-nocdaudio"))
		return -1;

	if (COM_CheckParm("-cdmediacheck"))
		mediaCheck = true;

	regs.x.ax = 0x1500;
	regs.x.bx = 0;
	dos_int86 (0x2f);
	if (regs.x.bx == 0)
	{
		Con_NotifyBox (
			"MSCDEX not loaded, music is\n"
			"disabled.  Use \"-nocdaudio\" if you\n"
			"wish to avoid this message in the\n"
			"future.  See README.TXT for help.\n"
			);			
		return -1;
	}
	if (regs.x.bx > 1)
		Con_DPrintf("CDAudio_Init: First CD-ROM drive will be used\n");
	cdrom = regs.x.cx;

	regs.x.ax = 0x150c;
	regs.x.bx = 0;
	dos_int86 (0x2f);
	if (regs.x.bx == 0)
	{
		Con_NotifyBox (
			"MSCDEX version 2.00 or later\n"
			"required for music. See README.TXT\n"
			"for help.\n"
			);			
		Con_DPrintf("CDAudio_Init: MSCDEX version 2.00 or later required.\n");
		return -1;
	}

	memory = dos_getmemory(sizeof(struct cd_request
) + sizeof(union readInfo_u));
	if (memory == NULL)
	{
		Con_DPrintf("CDAudio_Init: Unable to allocate low memory.\n");
		return -1;
	}

	cdRequest = (struct cd_request *)memory;
	cdRequestSegment = ptr2real(cdRequest) >> 4;
	cdRequestOffset = ptr2real(cdRequest) & 0xf;

	readInfo = (union readInfo_u *)(memory + sizeof(struct cd_request));
	readInfoSegment = ptr2real(readInfo) >> 4;
	readInfoOffset = ptr2real(readInfo) & 0xf;

	for (n = 0; n < 256; n++)
		remap[n] = n;
	initialized = true;

	CDAudio_SetVolume (255);
	if (CDAudio_GetAudioDiskInfo())
	{
		Con_Printf("CDAudio_Init: No CD in player.\n");
		enabled = false;
	}

	Cmd_AddCommand ("cd", CD_f);

	Con_Printf("CD Audio Initialized\n");

	return 0;
}


void CDAudio_Shutdown(void)
{
	if (!initialized)
		return;
	CDAudio_Stop();
}