9 files changed, 144 insertions, 117 deletions

diff --git a/src/audio/AudioLogic.cpp b/src/audio/AudioLogic.cpp
index a3493e38..15454bfe 100644
--- a/src/audio/AudioLogic.cpp
+++ b/src/audio/AudioLogic.cpp
@@ -43,9 +43,9 @@
 #include "Script.h"
 #include "Wanted.h"
 
-const int channels = ARRAY_SIZE(AudioManager.m_asActiveSamples);
-const int policeChannel = channels + 1;
-const int allChannels = channels + 2;
+#ifndef GTA_PS2
+#define CHANNEL_PLAYER_VEHICLE_ENGINE m_nActiveSamples
+#endif
 
 enum PLAY_STATUS { PLAY_STATUS_STOPPED = 0, PLAY_STATUS_PLAYING, PLAY_STATUS_FINISHED };
 enum LOADING_STATUS { LOADING_STATUS_NOT_LOADED = 0, LOADING_STATUS_LOADED, LOADING_STATUS_FAILED };
@@ -246,23 +246,25 @@ cAudioManager::ResetAudioLogicTimers(uint32 timer)
 	}
 	ClearMissionAudio(0);
 	ClearMissionAudio(1);
-	SampleManager.StopChannel(policeChannel);
+	SampleManager.StopChannel(CHANNEL_POLICE_RADIO);
 }
 
 void
 cAudioManager::ProcessReverb() const
 {
 #ifdef FIX_BUGS
-	const uint32 numChannels = channels;
+	const uint32 numChannels = NUM_CHANNELS_GENERIC;
 #else
-	const uint32 numChannels = 28;
+	const uint32 numChannels = NUM_CHANNELS_GENERIC+1;
 #endif
 
 	if (SampleManager.UpdateReverb() && m_bDynamicAcousticModelingStatus) {
+#ifndef GTA_PS2
 		for (uint32 i = 0; i < numChannels; i++) {
 			if (m_asActiveSamples[i].m_bReverbFlag)
 				SampleManager.SetChannelReverbFlag(i, TRUE);
 		}
+#endif
 	}
 }
 
@@ -347,7 +349,7 @@ cAudioManager::ProcessSpecial()
 			if (playerPed->m_audioEntityId >= 0 && m_asAudioEntities[playerPed->m_audioEntityId].m_bIsUsed) {
 				if (playerPed->EnteringCar()) {
 					if(!playerPed->bInVehicle && CWorld::Players[CWorld::PlayerInFocus].m_pRemoteVehicle == nil)
-						SampleManager.StopChannel(m_nActiveSamples);
+						SampleManager.StopChannel(CHANNEL_PLAYER_VEHICLE_ENGINE);
 				}
 			}
 		}
@@ -1307,7 +1309,7 @@ cAudioManager::ProcessVehicleEngine(cVehicleParams& params)
 	playerVeh = FindPlayerVehicle();
 	veh = params.m_pVehicle;
 	if (playerVeh == veh && veh->GetStatus() == STATUS_WRECKED) {
-		SampleManager.StopChannel(m_nActiveSamples);
+		SampleManager.StopChannel(CHANNEL_PLAYER_VEHICLE_ENGINE);
 		return;
 	}
 	if (!veh->bEngineOn)
@@ -1673,7 +1675,7 @@ cAudioManager::ProcessPlayersVehicleEngine(cVehicleParams& params, CVehicle* veh
 		accelerateState = Pads[0].GetAccelerate();
 		brakeState = Pads[0].GetBrake();
 	}
-	channelUsed = SampleManager.GetChannelUsedFlag(m_nActiveSamples);
+	channelUsed = SampleManager.GetChannelUsedFlag(CHANNEL_PLAYER_VEHICLE_ENGINE);
 	if (isMoped) {
 		CurrentPretendGear = params.m_pTransmission->nNumberOfGears;
 		currentGear = CurrentPretendGear;
@@ -1837,7 +1839,7 @@ cAudioManager::ProcessPlayersVehicleEngine(cVehicleParams& params, CVehicle* veh
 	if (accelerateState <= 0) {
 		if (params.m_fVelocityChange < -0.001f) {
 			if (channelUsed) {
-				SampleManager.StopChannel(m_nActiveSamples);
+				SampleManager.StopChannel(CHANNEL_PLAYER_VEHICLE_ENGINE);
 				bAccelSampleStopped = TRUE;
 			}
 			if (wheelsOnGround == 0 || params.m_pVehicle->bIsHandbrakeOn || lostTraction)
@@ -1849,7 +1851,7 @@ cAudioManager::ProcessPlayersVehicleEngine(cVehicleParams& params, CVehicle* veh
 			*gasPedalAudioPtr = Max(0.0f, gasPedalAudio);
 		} else if (LastAccel > 0) {
 			if (channelUsed) {
-				SampleManager.StopChannel(m_nActiveSamples);
+				SampleManager.StopChannel(CHANNEL_PLAYER_VEHICLE_ENGINE);
 				bAccelSampleStopped = TRUE;
 			}
 			nCruising = 0;
@@ -1910,7 +1912,7 @@ cAudioManager::ProcessPlayersVehicleEngine(cVehicleParams& params, CVehicle* veh
 				if (engineSoundType == SFX_BANK_TRUCK)
 					freq /= 2;
 				if (channelUsed) {
-					SampleManager.StopChannel(m_nActiveSamples);
+					SampleManager.StopChannel(CHANNEL_PLAYER_VEHICLE_ENGINE);
 					bAccelSampleStopped = TRUE;
 				}
 				if (params.m_pVehicle->bIsDrowning)
@@ -1925,55 +1927,55 @@ cAudioManager::ProcessPlayersVehicleEngine(cVehicleParams& params, CVehicle* veh
 					bAccelSampleStopped = FALSE;
 				}
 				if (channelUsed) {
-					SampleManager.SetChannelEmittingVolume(m_nActiveSamples, 120);
-					SampleManager.SetChannel3DPosition(m_nActiveSamples, pos.x, pos.y, pos.z);
-					SampleManager.SetChannel3DDistances(m_nActiveSamples, 50.0f, 12.5f);
+					SampleManager.SetChannelEmittingVolume(CHANNEL_PLAYER_VEHICLE_ENGINE, 120);
+					SampleManager.SetChannel3DPosition(CHANNEL_PLAYER_VEHICLE_ENGINE, pos.x, pos.y, pos.z);
+					SampleManager.SetChannel3DDistances(CHANNEL_PLAYER_VEHICLE_ENGINE, 50.0f, 12.5f);
 					freq = (GearFreqAdj[CurrentPretendGear] + freqModifier + 22050) ;
 					if (engineSoundType == SFX_BANK_TRUCK)
 						freq /= 2;
-					SampleManager.SetChannelFrequency(m_nActiveSamples, freq);
+					SampleManager.SetChannelFrequency(CHANNEL_PLAYER_VEHICLE_ENGINE, freq);
 					if (!channelUsed) {
-						SampleManager.SetChannelReverbFlag(m_nActiveSamples, m_bDynamicAcousticModelingStatus != FALSE);
-						SampleManager.StartChannel(m_nActiveSamples);
+						SampleManager.SetChannelReverbFlag(CHANNEL_PLAYER_VEHICLE_ENGINE, m_bDynamicAcousticModelingStatus != FALSE);
+						SampleManager.StartChannel(CHANNEL_PLAYER_VEHICLE_ENGINE);
 					}
 				} else if (processedAccelSampleStopped) {
 					gearSoundStartTime = CTimer::GetTimeInMilliseconds();
 					params.m_pVehicle->bAudioChangingGear = TRUE;
-					if (!SampleManager.InitialiseChannel(m_nActiveSamples, soundOffset + SFX_CAR_ACCEL_1, SFX_BANK_0))
+					if (!SampleManager.InitialiseChannel(CHANNEL_PLAYER_VEHICLE_ENGINE, soundOffset + SFX_CAR_ACCEL_1, SFX_BANK_0))
 						return;
-					SampleManager.SetChannelLoopCount(m_nActiveSamples, 1);
-					SampleManager.SetChannelLoopPoints(m_nActiveSamples, 0, -1);
+					SampleManager.SetChannelLoopCount(CHANNEL_PLAYER_VEHICLE_ENGINE, 1);
+					SampleManager.SetChannelLoopPoints(CHANNEL_PLAYER_VEHICLE_ENGINE, 0, -1);
 
-					SampleManager.SetChannelEmittingVolume(m_nActiveSamples, 120);
-					SampleManager.SetChannel3DPosition(m_nActiveSamples, pos.x, pos.y, pos.z);
-					SampleManager.SetChannel3DDistances(m_nActiveSamples, 50.0f, 12.5f);
+					SampleManager.SetChannelEmittingVolume(CHANNEL_PLAYER_VEHICLE_ENGINE, 120);
+					SampleManager.SetChannel3DPosition(CHANNEL_PLAYER_VEHICLE_ENGINE, pos.x, pos.y, pos.z);
+					SampleManager.SetChannel3DDistances(CHANNEL_PLAYER_VEHICLE_ENGINE, 50.0f, 12.5f);
 					freq = (GearFreqAdj[CurrentPretendGear] + freqModifier + 22050);
 					if (engineSoundType == SFX_BANK_TRUCK)
 						freq /= 2;
-					SampleManager.SetChannelFrequency(m_nActiveSamples, freq);
+					SampleManager.SetChannelFrequency(CHANNEL_PLAYER_VEHICLE_ENGINE, freq);
 					if (!channelUsed) {
-						SampleManager.SetChannelReverbFlag(m_nActiveSamples, m_bDynamicAcousticModelingStatus != FALSE);
-						SampleManager.StartChannel(m_nActiveSamples);
+						SampleManager.SetChannelReverbFlag(CHANNEL_PLAYER_VEHICLE_ENGINE, m_bDynamicAcousticModelingStatus != FALSE);
+						SampleManager.StartChannel(CHANNEL_PLAYER_VEHICLE_ENGINE);
 					}
 				} else if (CurrentPretendGear < params.m_pTransmission->nNumberOfGears - 1) {
 					++CurrentPretendGear;
 					gearSoundStartTime = CTimer::GetTimeInMilliseconds();
 					params.m_pVehicle->bAudioChangingGear = TRUE;
-					if (!SampleManager.InitialiseChannel(m_nActiveSamples, soundOffset + SFX_CAR_ACCEL_1, SFX_BANK_0))
+					if (!SampleManager.InitialiseChannel(CHANNEL_PLAYER_VEHICLE_ENGINE, soundOffset + SFX_CAR_ACCEL_1, SFX_BANK_0))
 						return;
-					SampleManager.SetChannelLoopCount(m_nActiveSamples, 1);
-					SampleManager.SetChannelLoopPoints(m_nActiveSamples, 0, -1);
+					SampleManager.SetChannelLoopCount(CHANNEL_PLAYER_VEHICLE_ENGINE, 1);
+					SampleManager.SetChannelLoopPoints(CHANNEL_PLAYER_VEHICLE_ENGINE, 0, -1);
 
-					SampleManager.SetChannelEmittingVolume(m_nActiveSamples, 120);
-					SampleManager.SetChannel3DPosition(m_nActiveSamples, pos.x, pos.y, pos.z);
-					SampleManager.SetChannel3DDistances(m_nActiveSamples, 50.0f, 12.5f);
+					SampleManager.SetChannelEmittingVolume(CHANNEL_PLAYER_VEHICLE_ENGINE, 120);
+					SampleManager.SetChannel3DPosition(CHANNEL_PLAYER_VEHICLE_ENGINE, pos.x, pos.y, pos.z);
+					SampleManager.SetChannel3DDistances(CHANNEL_PLAYER_VEHICLE_ENGINE, 50.0f, 12.5f);
 					freq = (GearFreqAdj[CurrentPretendGear] + freqModifier + 22050);
 					if (engineSoundType == SFX_BANK_TRUCK)
 						freq /= 2;
-					SampleManager.SetChannelFrequency(m_nActiveSamples, freq);
+					SampleManager.SetChannelFrequency(CHANNEL_PLAYER_VEHICLE_ENGINE, freq);
 					if (!channelUsed) {
-						SampleManager.SetChannelReverbFlag(m_nActiveSamples, m_bDynamicAcousticModelingStatus != FALSE);
-						SampleManager.StartChannel(m_nActiveSamples);
+						SampleManager.SetChannelReverbFlag(CHANNEL_PLAYER_VEHICLE_ENGINE, m_bDynamicAcousticModelingStatus != FALSE);
+						SampleManager.StartChannel(CHANNEL_PLAYER_VEHICLE_ENGINE);
 					}
 				} else {
 					nCruising = 1;
@@ -1983,7 +1985,7 @@ cAudioManager::ProcessPlayersVehicleEngine(cVehicleParams& params, CVehicle* veh
 		} else {
 PlayCruising:
 			bAccelSampleStopped = TRUE;
-			SampleManager.StopChannel(m_nActiveSamples);
+			SampleManager.StopChannel(CHANNEL_PLAYER_VEHICLE_ENGINE);
 			if (isMoped || accelerateState >= 150 && wheelsOnGround && brakeState <= 0 && !params.m_pVehicle->bIsHandbrakeOn
 				&& !lostTraction && currentGear >= params.m_pTransmission->nNumberOfGears - 1) {
 				if (accelerateState >= 220 && params.m_fVelocityChange + 0.001f >= velocityChangeForAudio) {
diff --git a/src/audio/AudioManager.cpp b/src/audio/AudioManager.cpp
index 3be053d2..e56d28e1 100644
--- a/src/audio/AudioManager.cpp
+++ b/src/audio/AudioManager.cpp
@@ -14,10 +14,6 @@
 
 cAudioManager AudioManager;
 
-const int channels = ARRAY_SIZE(AudioManager.m_asActiveSamples);
-const int policeChannel = channels + 1;
-const int allChannels = channels + 2;
-
 #define SPEED_OF_SOUND 343.f
 #define TIME_SPENT 40
 
@@ -28,7 +24,7 @@ cAudioManager::cAudioManager()
 	field_6 = 0;
 	m_fSpeedOfSound = SPEED_OF_SOUND / TIME_SPENT;
 	m_nTimeSpent = TIME_SPENT;
-	m_nActiveSamples = NUM_SOUNDS_SAMPLES_SLOTS;
+	m_nActiveSamples = NUM_CHANNELS_GENERIC;
 	m_nActiveSampleQueue = 1;
 	ClearRequestedQueue();
 	m_nActiveSampleQueue = 0;
@@ -276,7 +272,7 @@ cAudioManager::ResetTimers(uint32 time)
 		ClearActiveSamples();
 		ClearMissionAudio(0);
 		ClearMissionAudio(1);
-		SampleManager.StopChannel(policeChannel);
+		SampleManager.StopChannel(CHANNEL_POLICE_RADIO);
 		SampleManager.SetEffectsFadeVolume(0);
 		SampleManager.SetMusicFadeVolume(0);
 		MusicManager.ResetMusicAfterReload();
@@ -446,7 +442,7 @@ cAudioManager::ServiceSoundEffects()
 {
 	m_bFifthFrameFlag = (m_FrameCounter++ % 5) == 0;
 	if (m_nUserPause && !m_nPreviousUserPause) {
-		for (int32 i = 0; i < allChannels; i++)
+		for (int32 i = 0; i < NUM_CHANNELS; i++)
 			SampleManager.StopChannel(i);
 
 		ClearRequestedQueue();
@@ -773,7 +769,12 @@ cAudioManager::UpdateReflections()
 void
 cAudioManager::AddReleasingSounds()
 {
-	bool8 toProcess[44]; // why not 27?
+	// in case someone would want to increase it
+#ifdef FIX_BUGS
+	bool8 toProcess[NUM_CHANNELS_GENERIC];
+#else
+	bool8 toProcess[44];
+#endif
 
 	int8 queue = m_nActiveSampleQueue == 0 ? 1 : 0;
 
diff --git a/src/audio/AudioManager.h b/src/audio/AudioManager.h
index 49535252..d5b3ce15 100644
--- a/src/audio/AudioManager.h
+++ b/src/audio/AudioManager.h
@@ -205,10 +205,10 @@ public:
 	int32 m_nTimer;
 	tSound m_sQueueSample;
 	uint8 m_nActiveSampleQueue;
-	tSound m_asSamples[NUM_SOUNDS_SAMPLES_BANKS][NUM_SOUNDS_SAMPLES_SLOTS];
-	uint8 m_abSampleQueueIndexTable[NUM_SOUNDS_SAMPLES_BANKS][NUM_SOUNDS_SAMPLES_SLOTS];
+	tSound m_asSamples[NUM_SOUNDS_SAMPLES_BANKS][NUM_CHANNELS_GENERIC];
+	uint8 m_abSampleQueueIndexTable[NUM_SOUNDS_SAMPLES_BANKS][NUM_CHANNELS_GENERIC];
 	uint8 m_SampleRequestQueuesStatus[NUM_SOUNDS_SAMPLES_BANKS];
-	tSound m_asActiveSamples[NUM_SOUNDS_SAMPLES_SLOTS];
+	tSound m_asActiveSamples[NUM_CHANNELS_GENERIC];
 	tAudioEntity m_asAudioEntities[NUM_AUDIOENTITIES];
 	int32 m_anAudioEntityIndices[NUM_AUDIOENTITIES];
 	int32 m_nAudioEntitiesTotal;
@@ -544,7 +544,7 @@ public:
 #endif
 };
 
-#ifdef AUDIO_MSS
+#if defined(AUDIO_MSS) && !defined(PS2_AUDIO_CHANNELS)
 static_assert(sizeof(cAudioManager) == 0x5558, "cAudioManager: error");
 #endif
 
diff --git a/src/audio/PolRadio.cpp b/src/audio/PolRadio.cpp
index cf92bb95..82f44dee 100644
--- a/src/audio/PolRadio.cpp
+++ b/src/audio/PolRadio.cpp
@@ -15,9 +15,6 @@
 #include "sampman.h"
 #include "Wanted.h"
 
-const int channels = ARRAY_SIZE(AudioManager.m_asActiveSamples);
-const int policeChannel = channels + 1;
-
 struct tPoliceRadioZone {
 	char m_aName[8];
 	uint32 m_nSampleIndex;
@@ -68,7 +65,7 @@ cAudioManager::InitialisePoliceRadio()
 	for (int32 i = 0; i < ARRAY_SIZE(m_sPoliceRadioQueue.crimes); i++)
 		m_sPoliceRadioQueue.crimes[i].type = CRIME_NONE;
 
-	SampleManager.SetChannelReverbFlag(policeChannel, FALSE);
+	SampleManager.SetChannelReverbFlag(CHANNEL_POLICE_RADIO, FALSE);
 	gSpecialSuspectLastSeenReport = FALSE;
 	for (int32 i = 0; i < ARRAY_SIZE(gMinTimeToNextReport); i++)
 		gMinTimeToNextReport[i] = m_FrameCounter;
@@ -78,7 +75,7 @@ void
 cAudioManager::ResetPoliceRadio()
 {
 	if (!m_bIsInitialised) return;
-	if (SampleManager.GetChannelUsedFlag(policeChannel)) SampleManager.StopChannel(policeChannel);
+	if (SampleManager.GetChannelUsedFlag(CHANNEL_POLICE_RADIO)) SampleManager.StopChannel(CHANNEL_POLICE_RADIO);
 	InitialisePoliceRadio();
 }
 
@@ -168,7 +165,7 @@ cAudioManager::ServicePoliceRadioChannel(uint8 wantedLevel)
 	if (!m_bIsInitialised) return;
 
 	if (m_nUserPause != 0) {
-		if (SampleManager.GetChannelUsedFlag(policeChannel)) SampleManager.StopChannel(policeChannel);
+		if (SampleManager.GetChannelUsedFlag(CHANNEL_POLICE_RADIO)) SampleManager.StopChannel(CHANNEL_POLICE_RADIO);
 		if (g_nMissionAudioSfx != NO_SAMPLE && bMissionAudioPhysicalPlayingStatus == 1 &&
 			SampleManager.IsStreamPlaying(1)) {
 			SampleManager.PauseStream(TRUE, 1);
@@ -200,7 +197,7 @@ cAudioManager::ServicePoliceRadioChannel(uint8 wantedLevel)
 					}
 					return;
 				}
-			} else if (!SampleManager.GetChannelUsedFlag(policeChannel)) {
+			} else if (!SampleManager.GetChannelUsedFlag(CHANNEL_POLICE_RADIO)) {
 				SampleManager.PreloadStreamedFile(g_nMissionAudioSfx, 1);
 				SampleManager.SetStreamedVolumeAndPan(MAX_VOLUME, 63, TRUE, 1);
 				SampleManager.StartPreloadedStreamedFile(1);
@@ -211,7 +208,7 @@ cAudioManager::ServicePoliceRadioChannel(uint8 wantedLevel)
 		}
 		if (bChannelOpen) DoPoliceRadioCrackle();
 		if ((g_nMissionAudioSfx == NO_SAMPLE || g_nMissionAudioPlayingStatus != 1) &&
-			!SampleManager.GetChannelUsedFlag(policeChannel) && m_sPoliceRadioQueue.policeChannelTimer) {
+			!SampleManager.GetChannelUsedFlag(CHANNEL_POLICE_RADIO) && m_sPoliceRadioQueue.policeChannelTimer) {
 			if (m_sPoliceRadioQueue.policeChannelTimer) {
 				sample = m_sPoliceRadioQueue.crimesSamples[m_sPoliceRadioQueue.policeChannelCounterSeconds];
 				m_sPoliceRadioQueue.policeChannelTimer--;
@@ -230,7 +227,7 @@ cAudioManager::ServicePoliceRadioChannel(uint8 wantedLevel)
 			if (sample == NO_SAMPLE) {
 				if (!processed) cWait = 30;
 			} else {
-				SampleManager.InitialiseChannel(policeChannel, sample, 0);
+				SampleManager.InitialiseChannel(CHANNEL_POLICE_RADIO, sample, 0);
 				switch (sample) {
 				case SFX_POLICE_RADIO_MESSAGE_NOISE_1:
 					freq = m_anRandomTable[4] % 2000 + 10025;
@@ -239,12 +236,12 @@ cAudioManager::ServicePoliceRadioChannel(uint8 wantedLevel)
 				default: freq = SampleManager.GetSampleBaseFrequency(sample); break;
 				}
 				PoliceChannelFreq = freq;
-				SampleManager.SetChannelFrequency(policeChannel, freq);
-				SampleManager.SetChannelVolume(policeChannel, 100);
-				SampleManager.SetChannelPan(policeChannel, 63);
-				SampleManager.SetChannelLoopCount(policeChannel, 1);
-				SampleManager.SetChannelLoopPoints(policeChannel, 0, -1);
-				SampleManager.StartChannel(policeChannel);
+				SampleManager.SetChannelFrequency(CHANNEL_POLICE_RADIO, freq);
+				SampleManager.SetChannelVolume(CHANNEL_POLICE_RADIO, 100);
+				SampleManager.SetChannelPan(CHANNEL_POLICE_RADIO, 63);
+				SampleManager.SetChannelLoopCount(CHANNEL_POLICE_RADIO, 1);
+				SampleManager.SetChannelLoopPoints(CHANNEL_POLICE_RADIO, 0, -1);
+				SampleManager.StartChannel(CHANNEL_POLICE_RADIO);
 			}
 			if (processed) ResetPoliceRadio();
 		}
diff --git a/src/audio/audio_enums.h b/src/audio/audio_enums.h
index 990b2d73..5a14d312 100644
--- a/src/audio/audio_enums.h
+++ b/src/audio/audio_enums.h
@@ -1295,3 +1295,26 @@ enum eAudioType
 	AUDIOTYPE_POLICERADIO,
 	TOTAL_AUDIO_TYPES,
 };
+
+#ifdef GTA_PS2
+enum
+{
+	NUM_CHANNELS_GENERIC = 42,
+	CHANNEL_POLICE_RADIO = NUM_CHANNELS_GENERIC,
+	CHANNEL_MISSION_AUDIO_1,
+	CHANNEL_MISSION_AUDIO_2,
+	CHANNEL_PLAYER_VEHICLE_ENGINE,
+	NUM_CHANNELS
+};
+#else
+enum
+{
+#ifdef PS2_AUDIO_CHANNELS
+	NUM_CHANNELS_GENERIC = 42,
+#else
+	NUM_CHANNELS_GENERIC = 27,
+#endif
+	CHANNEL_POLICE_RADIO,
+	NUM_CHANNELS
+};
+#endif
diff --git a/src/audio/oal/channel.cpp b/src/audio/oal/channel.cpp
index 1bb4c4a8..04e7e529 100644
--- a/src/audio/oal/channel.cpp
+++ b/src/audio/oal/channel.cpp
@@ -10,9 +10,9 @@
 
 extern bool IsFXSupported();
 
-ALuint alSources[MAXCHANNELS+MAX2DCHANNELS];
-ALuint alFilters[MAXCHANNELS+MAX2DCHANNELS];
-ALuint alBuffers[MAXCHANNELS+MAX2DCHANNELS];
+ALuint alSources[NUM_CHANNELS];
+ALuint alFilters[NUM_CHANNELS];
+ALuint alBuffers[NUM_CHANNELS];
 bool bChannelsCreated = false;
 
 int32 CChannel::channelsThatNeedService = 0;
@@ -22,10 +22,10 @@ uint8 tempStereoBuffer[PED_BLOCKSIZE * 2];
 void
 CChannel::InitChannels()
 {
-	alGenSources(MAXCHANNELS+MAX2DCHANNELS, alSources);
-	alGenBuffers(MAXCHANNELS+MAX2DCHANNELS, alBuffers);
+	alGenSources(NUM_CHANNELS, alSources);
+	alGenBuffers(NUM_CHANNELS, alBuffers);
 	if (IsFXSupported())
-		alGenFilters(MAXCHANNELS + MAX2DCHANNELS, alFilters);
+		alGenFilters(NUM_CHANNELS, alFilters);
 	bChannelsCreated = true;
 }
 
@@ -34,13 +34,13 @@ CChannel::DestroyChannels()
 {
 	if (bChannelsCreated) 
 	{
-		alDeleteSources(MAXCHANNELS + MAX2DCHANNELS, alSources);
+		alDeleteSources(NUM_CHANNELS, alSources);
 		memset(alSources, 0, sizeof(alSources));
-		alDeleteBuffers(MAXCHANNELS + MAX2DCHANNELS, alBuffers);
+		alDeleteBuffers(NUM_CHANNELS, alBuffers);
 		memset(alBuffers, 0, sizeof(alBuffers));
 		if (IsFXSupported())
 		{
-			alDeleteFilters(MAXCHANNELS + MAX2DCHANNELS, alFilters);
+			alDeleteFilters(NUM_CHANNELS, alFilters);
 			memset(alFilters, 0, sizeof(alFilters));
 		}
 		bChannelsCreated = false;
diff --git a/src/audio/sampman.h b/src/audio/sampman.h
index 7c60080d..d6fc5cc0 100644
--- a/src/audio/sampman.h
+++ b/src/audio/sampman.h
@@ -1,5 +1,6 @@
 #pragma once
 #include "AudioSamples.h"
+#include "audio_enums.h"
 
 #define MAX_VOLUME 127
 #define MAX_FREQ DIGITALRATE
@@ -115,10 +116,9 @@ enum
 
 #define MAXPROVIDERS               64
 
-#define MAXCHANNELS                28
-#define MAXCHANNELS_SURROUND       24
+#define MAXCHANNELS                (NUM_CHANNELS_GENERIC+1)
+#define MAXCHANNELS_SURROUND       (MAXCHANNELS-4)
 #define MAX2DCHANNELS              1
-#define CHANNEL2D                  MAXCHANNELS
 
 #define MAX_STREAMS                3
 
@@ -126,7 +126,13 @@ enum
 #define DIGITALBITS                16
 #define DIGITALCHANNELS            2
 
-#define MAX_DIGITAL_MIXER_CHANNELS 34
+#ifdef FIX_BUGS
+#define MAX_DIGITAL_MIXER_CHANNELS (MAXCHANNELS+MAX_STREAMS*2+MAX2DCHANNELS)
+#else
+#define MAX_DIGITAL_MIXER_CHANNELS (MAXCHANNELS+MAX_STREAMS*2)
+#endif 
+
+static_assert( NUM_CHANNELS == MAXCHANNELS + MAX2DCHANNELS, "The number of channels doesn't match with an enum" );
 
 class cSampleManager
 {
diff --git a/src/audio/sampman_miles.cpp b/src/audio/sampman_miles.cpp
index a6f04775..558be334 100644
--- a/src/audio/sampman_miles.cpp
+++ b/src/audio/sampman_miles.cpp
@@ -1694,7 +1694,7 @@ cSampleManager::SetChannelReverbFlag(uint32 nChannel, bool8 nReverbFlag)
 	
 	switch ( nChannel )
 	{
-		case CHANNEL2D:
+		case CHANNEL_POLICE_RADIO:
 		{
 			b2d = TRUE;
 			break;
@@ -1723,7 +1723,7 @@ cSampleManager::InitialiseChannel(uint32 nChannel, uint32 nSfx, uint8 nBank)
 
 	switch ( nChannel )
 	{
-		case CHANNEL2D:
+		case CHANNEL_POLICE_RADIO:
 		{
 			b2d = TRUE;
 			break;
@@ -1823,7 +1823,7 @@ cSampleManager::SetChannelVolume(uint32 nChannel, uint32 nVolume)
 	
 	switch ( nChannel )
 	{
-		case CHANNEL2D:
+		case CHANNEL_POLICE_RADIO:
 		{
 			nChannelVolume[nChannel] = vol;
 			
@@ -1850,7 +1850,7 @@ cSampleManager::SetChannelPan(uint32 nChannel, uint32 nPan)
 {
 	switch ( nChannel )
 	{
-		case CHANNEL2D:
+		case CHANNEL_POLICE_RADIO:
 		{
 #ifndef FIX_BUGS
 			if ( opened_samples[nChannel - MAXCHANNELS] ) // BUG
@@ -1871,7 +1871,7 @@ cSampleManager::SetChannelFrequency(uint32 nChannel, uint32 nFreq)
 
 	switch ( nChannel )
 	{
-		case CHANNEL2D:
+		case CHANNEL_POLICE_RADIO:
 		{
 			b2d = TRUE;
 			break;
@@ -1897,7 +1897,7 @@ cSampleManager::SetChannelLoopPoints(uint32 nChannel, uint32 nLoopStart, int32 n
 
 	switch ( nChannel )
 	{
-		case CHANNEL2D:
+		case CHANNEL_POLICE_RADIO:
 		{
 			b2d = TRUE;
 			break;
@@ -1923,7 +1923,7 @@ cSampleManager::SetChannelLoopCount(uint32 nChannel, uint32 nLoopCount)
 
 	switch ( nChannel )
 	{
-		case CHANNEL2D:
+		case CHANNEL_POLICE_RADIO:
 		{
 			b2d = TRUE;
 			break;
@@ -1949,7 +1949,7 @@ cSampleManager::GetChannelUsedFlag(uint32 nChannel)
 
 	switch ( nChannel )
 	{
-		case CHANNEL2D:
+		case CHANNEL_POLICE_RADIO:
 		{
 			b2d = TRUE;
 			break;
@@ -1980,7 +1980,7 @@ cSampleManager::StartChannel(uint32 nChannel)
 
 	switch ( nChannel )
 	{
-		case CHANNEL2D:
+		case CHANNEL_POLICE_RADIO:
 		{
 			b2d = TRUE;
 			break;
@@ -2006,7 +2006,7 @@ cSampleManager::StopChannel(uint32 nChannel)
 
 	switch ( nChannel )
 	{
-		case CHANNEL2D:
+		case CHANNEL_POLICE_RADIO:
 		{
 			b2d = TRUE;
 			break;
diff --git a/src/audio/sampman_oal.cpp b/src/audio/sampman_oal.cpp
index e74fac82..a4c92482 100644
--- a/src/audio/sampman_oal.cpp
+++ b/src/audio/sampman_oal.cpp
@@ -94,8 +94,8 @@ int32 nPedSlotSfx    [MAX_PEDSFX];
 int32 nPedSlotSfxAddr[MAX_PEDSFX];
 uint8 nCurrentPedSlot;
 
-CChannel aChannel[MAXCHANNELS+MAX2DCHANNELS];
-uint8 nChannelVolume[MAXCHANNELS+MAX2DCHANNELS];
+CChannel aChannel[NUM_CHANNELS];
+uint8 nChannelVolume[NUM_CHANNELS];
 
 uint32 nStreamLength[TOTAL_STREAMED_SOUNDS];
 ALuint ALStreamSources[MAX_STREAMS][2];
@@ -213,9 +213,8 @@ add_providers()
 static void
 release_existing()
 {
-	for ( int32 i = 0; i < MAXCHANNELS; i++ )
+	for ( int32 i = 0; i < NUM_CHANNELS; i++ )
 		aChannel[i].Term();
-	aChannel[CHANNEL2D].Term();
 	
 	if ( IsFXSupported() )
 	{
@@ -284,7 +283,8 @@ set_new_provider(int index)
 		_maxSamples = MAXCHANNELS;
 		
 		ALCint attr[] = {ALC_FREQUENCY,MAX_FREQ,
-						ALC_MONO_SOURCES, MAX_STREAMS * 2 + MAXCHANNELS,
+						ALC_MONO_SOURCES, MAX_DIGITAL_MIXER_CHANNELS - MAX2DCHANNELS,
+						ALC_STEREO_SOURCES, MAX2DCHANNELS,
 						0,
 						};
 		
@@ -370,8 +370,9 @@ set_new_provider(int index)
 		CChannel::InitChannels();
 
 		for ( int32 i = 0; i < MAXCHANNELS; i++ )
-			aChannel[i].Init(i);
-		aChannel[CHANNEL2D].Init(CHANNEL2D, true);
+			aChannel[i].Init(i); 
+		for ( int32 i = 0; i < MAX2DCHANNELS; i++ )
+			aChannel[MAXCHANNELS+i].Init(MAXCHANNELS+i, true);
 		
 		if ( IsFXSupported() )
 		{
@@ -978,7 +979,7 @@ cSampleManager::Initialise(void)
 	}
 	
 	{
-		for ( int32 i = 0; i < MAXCHANNELS+MAX2DCHANNELS; i++ )
+		for ( int32 i = 0; i < NUM_CHANNELS; i++ )
 			nChannelVolume[i] = 0;
 	}
 	
@@ -1184,7 +1185,7 @@ cSampleManager::UpdateEffectsVolume(void)
 {
 	if ( _bSampmanInitialised )
 	{
-		for ( int32 i = 0; i < MAXCHANNELS+MAX2DCHANNELS; i++ )
+		for ( int32 i = 0; i < NUM_CHANNELS; i++ )
 		{
 			if ( GetChannelUsedFlag(i) )
 			{
@@ -1492,7 +1493,7 @@ bool8 cSampleManager::UpdateReverb(void)
 void
 cSampleManager::SetChannelReverbFlag(uint32 nChannel, bool8 nReverbFlag)
 {
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel < NUM_CHANNELS );
 	
 	if ( usingEAX || _usingEFX )
 	{
@@ -1511,7 +1512,7 @@ cSampleManager::SetChannelReverbFlag(uint32 nChannel, bool8 nReverbFlag)
 bool8
 cSampleManager::InitialiseChannel(uint32 nChannel, uint32 nSfx, uint8 nBank)
 {
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel < NUM_CHANNELS );
 	
 	uintptr addr;
 	
@@ -1552,8 +1553,7 @@ cSampleManager::InitialiseChannel(uint32 nChannel, uint32 nSfx, uint8 nBank)
 void
 cSampleManager::SetChannelEmittingVolume(uint32 nChannel, uint32 nVolume)
 {
-	ASSERT( nChannel != CHANNEL2D );
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel < MAXCHANNELS );
 	
 	uint32 vol = nVolume;
 	if ( vol > MAX_VOLUME ) vol = MAX_VOLUME;
@@ -1574,8 +1574,7 @@ cSampleManager::SetChannelEmittingVolume(uint32 nChannel, uint32 nVolume)
 void
 cSampleManager::SetChannel3DPosition(uint32 nChannel, float fX, float fY, float fZ)
 {
-	ASSERT( nChannel != CHANNEL2D );
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel < MAXCHANNELS );
 	
 	aChannel[nChannel].SetPosition(-fX, fY, fZ);
 }
@@ -1583,18 +1582,17 @@ cSampleManager::SetChannel3DPosition(uint32 nChannel, float fX, float fY, float
 void
 cSampleManager::SetChannel3DDistances(uint32 nChannel, float fMax, float fMin)
 {
-	ASSERT( nChannel != CHANNEL2D );
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel < MAXCHANNELS );
 	aChannel[nChannel].SetDistances(fMax, fMin);
 }
 
 void
 cSampleManager::SetChannelVolume(uint32 nChannel, uint32 nVolume)
 {
-	ASSERT( nChannel == CHANNEL2D );
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel >= MAXCHANNELS );
+	ASSERT( nChannel < NUM_CHANNELS );
 	
-	if ( nChannel == CHANNEL2D )
+	if ( nChannel == CHANNEL_POLICE_RADIO )
 	{
 		uint32 vol = nVolume;
 		if ( vol > MAX_VOLUME ) vol = MAX_VOLUME;
@@ -1616,10 +1614,10 @@ cSampleManager::SetChannelVolume(uint32 nChannel, uint32 nVolume)
 void
 cSampleManager::SetChannelPan(uint32 nChannel, uint32 nPan)
 {
-	ASSERT(nChannel == CHANNEL2D);
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel >= MAXCHANNELS );
+	ASSERT( nChannel < NUM_CHANNELS );
 	
-	if ( nChannel == CHANNEL2D )
+	if ( nChannel == CHANNEL_POLICE_RADIO )
 	{
 		aChannel[nChannel].SetPan(nPan);
 	}
@@ -1628,7 +1626,7 @@ cSampleManager::SetChannelPan(uint32 nChannel, uint32 nPan)
 void
 cSampleManager::SetChannelFrequency(uint32 nChannel, uint32 nFreq)
 {
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel < NUM_CHANNELS );
 	
 	aChannel[nChannel].SetCurrentFreq(nFreq);
 }
@@ -1636,7 +1634,7 @@ cSampleManager::SetChannelFrequency(uint32 nChannel, uint32 nFreq)
 void
 cSampleManager::SetChannelLoopPoints(uint32 nChannel, uint32 nLoopStart, int32 nLoopEnd)
 {
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel < NUM_CHANNELS );
 	
 	aChannel[nChannel].SetLoopPoints(nLoopStart / (DIGITALBITS / 8), nLoopEnd / (DIGITALBITS / 8));
 }
@@ -1644,7 +1642,7 @@ cSampleManager::SetChannelLoopPoints(uint32 nChannel, uint32 nLoopStart, int32 n
 void
 cSampleManager::SetChannelLoopCount(uint32 nChannel, uint32 nLoopCount)
 {
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel < NUM_CHANNELS );
 	
 	aChannel[nChannel].SetLoopCount(nLoopCount);
 }
@@ -1652,7 +1650,7 @@ cSampleManager::SetChannelLoopCount(uint32 nChannel, uint32 nLoopCount)
 bool8
 cSampleManager::GetChannelUsedFlag(uint32 nChannel)
 {
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel < NUM_CHANNELS );
 	
 	return aChannel[nChannel].IsUsed();
 }
@@ -1660,7 +1658,7 @@ cSampleManager::GetChannelUsedFlag(uint32 nChannel)
 void
 cSampleManager::StartChannel(uint32 nChannel)
 {
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel < NUM_CHANNELS );
 	
 	aChannel[nChannel].Start();
 }
@@ -1668,7 +1666,7 @@ cSampleManager::StartChannel(uint32 nChannel)
 void
 cSampleManager::StopChannel(uint32 nChannel)
 {
-	ASSERT( nChannel < MAXCHANNELS+MAX2DCHANNELS );
+	ASSERT( nChannel < NUM_CHANNELS );
 	
 	aChannel[nChannel].Stop();
 }
@@ -2007,7 +2005,7 @@ cSampleManager::Service(void)
 			stream->Update();
 	}
 	int refCount = CChannel::channelsThatNeedService;
-	for ( int32 i = 0; refCount && i < MAXCHANNELS+MAX2DCHANNELS; i++ )
+	for ( int32 i = 0; refCount && i < NUM_CHANNELS; i++ )
 	{
 		if ( aChannel[i].Update() )
 			refCount--;