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/*

 * This file is part of the DXX-Rebirth project <https://www.dxx-rebirth.com/>.

 * It is copyright by its individual contributors, as recorded in the

 * project's Git history.  See COPYING.txt at the top level for license

 * terms and a link to the Git history.

 */

/*

 *

 * SDL digital audio support

 *

 *

 */

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <SDL.h>

#include <digi_audio.h>

#include "dxxerror.h"

#include "vecmat.h"

#include "digi.h"

#include "sounds.h"

#include "config.h"

#include "args.h"

#include "piggy.h"

#include "compiler-range_for.h"

namespace dcx {

//changed on 980905 by adb to increase number of concurrent sounds

//end changes by adb

#define SOUND_BUFFER_SIZE 1024

#define MIN_VOLUME 10

/* This table is used to add two sound values together and pin

 * the value to avoid overflow.  (used with permission from ARDI)

 * DPH: Taken from SDL/src/SDL_mixer.c.

 */

constexpr uint8_t mix8[] =

{

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,

  0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,

  0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,

  0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24,

  0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,

  0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A,

  0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45,

  0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,

  0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B,

  0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,

  0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,

  0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C,

  0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,

  0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92,

  0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D,

  0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8,

  0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3,

  0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE,

  0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9,

  0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4,

  0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,

  0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,

  0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5,

  0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

};

static int digi_initialised = 0;

struct sound_slot {

        int soundno;

        bool playing;   // Is there a sample playing on this channel?

        bool looped;    // Play this sample looped?

        bool persistent; // This can't be pre-empted

        fix pan;       // 0 = far left, 1 = far right

        fix volume;    // 0 = nothing, 1 = fully on

        //changed on 980905 by adb from char * to unsigned char *

        unsigned char *samples;

        sound_object *soundobj;   // Which soundobject is on this channel

        //end changes by adb

        unsigned int length; // Length of the sample

        unsigned int position; // Position we are at at the moment.

};

static void digi_audio_stop_sound(sound_slot &s)

{

        s.playing = 0;

        s.soundobj = sound_object_none;

        s.persistent = 0;

}

static std::array<sound_slot, 32> SoundSlots;

}

namespace dsx {

static SDL_AudioSpec WaveSpec;

static int next_channel = 0;

/* Audio mixing callback */

//changed on 980905 by adb to cleanup, add pan support and optimize mixer

static void audio_mixcallback(void *, Uint8 *stream, int len)

{

        Uint8 *streamend = stream + len;

        if (!digi_initialised)

                return;

        memset(stream, 0x80, len); // fix "static" sound bug on Mac OS X

        SDL_LockAudio();

        range_for (auto &sl, SoundSlots)

        {

                if (sl.playing) {

                        Uint8 *sldata = sl.samples + sl.position, *slend = sl.samples + sl.length;

                        Uint8 *sp = stream, s;

                        signed char v;

                        fix vl, vr;

                        int x;

                        if ((x = sl.pan) & 0x8000) {

                                vl = 0x20000 - x * 2;

                                vr = 0x10000;

                        } else {

                                vl = 0x10000;

                                vr = x * 2;

                        }

                        vl = fixmul(vl, (x = sl.volume));

                        vr = fixmul(vr, x);

                        while (sp < streamend) {

                                if (sldata == slend) {

                                        if (!sl.looped) {

                                                sl.playing = 0;

                                                break;

                                        }

                                        sldata = sl.samples;

                                }

                                v = *(sldata++) - 0x80;

                                s = *sp;

                                *(sp++) = mix8[ s + fixmul(v, vl) + 0x80 ];

                                s = *sp;

                                *(sp++) = mix8[ s + fixmul(v, vr) + 0x80 ];

                        }

                        sl.position = sldata - sl.samples;

                }

        }

        SDL_UnlockAudio();

}

//end changes by adb

/* Initialise audio devices. */

int digi_audio_init()

{

        if (SDL_InitSubSystem(SDL_INIT_AUDIO)<0) {

                Error("SDL audio initialisation failed: %s.",SDL_GetError());

        }

#if defined(DXX_BUILD_DESCENT_I)

        WaveSpec.freq = digi_sample_rate;

#elif defined(DXX_BUILD_DESCENT_II)

        WaveSpec.freq = GameArg.SndDigiSampleRate;

#endif

        //added/changed by Sam Lantinga on 12/01/98 for new SDL version

        WaveSpec.format = AUDIO_U8;

        WaveSpec.channels = 2;

        //end this section addition/change - SL

        WaveSpec.samples = SOUND_BUFFER_SIZE;

        WaveSpec.callback = audio_mixcallback;

        if ( SDL_OpenAudio(&WaveSpec, NULL) < 0 ) {

                //edited on 10/05/98 by Matt Mueller - should keep running, just with no sound.

                Warning("\nError: Couldn't open audio: %s\n", SDL_GetError());

                //killed  exit(2);

                return 1;

                //end edit -MM

        }

        SDL_PauseAudio(0);

        digi_initialised = 1;

        digi_audio_set_digi_volume( (GameCfg.DigiVolume*32768)/8 );

        return 0;

}

/* Toggle audio */

void digi_audio_reset() { }

/* Shut down audio */

void digi_audio_close()

{

        if (!digi_initialised) return;

        digi_initialised = 0;

#ifdef __MINGW32__

        SDL_Delay(500); // CloseAudio hangs if it's called too soon after opening?

#endif

        SDL_CloseAudio();

}

void digi_audio_stop_all_channels()

{

        range_for (auto &i, SoundSlots)

                digi_audio_stop_sound(i);

}

// Volume 0-F1_0

int digi_audio_start_sound(short soundnum, fix volume, int pan, int looping, int, int, sound_object *const soundobj)

{

        int i, starting_channel;

        if (!digi_initialised) return -1;

        if (soundnum < 0) return -1;

        SDL_LockAudio();

        Assert(GameSounds[soundnum].data != reinterpret_cast<void *>(-1));

        starting_channel = next_channel;

        while(1)

        {

                if (!SoundSlots[next_channel].playing)

                        break;

                if (!SoundSlots[next_channel].persistent)

                        break;  // use this channel!

                next_channel++;

                if (next_channel >= digi_max_channels)

                        next_channel = 0;

                if (next_channel == starting_channel)

                {

                        SDL_UnlockAudio();

                        return -1;

                }

        }

        if (SoundSlots[next_channel].playing)

        {

                SoundSlots[next_channel].playing = 0;

                if (SoundSlots[next_channel].soundobj != sound_object_none)

                {

                        digi_end_soundobj(*SoundSlots[next_channel].soundobj);

                }

                if (SoundQ_channel == next_channel)

                        SoundQ_end();

        }

#ifndef NDEBUG

        verify_sound_channel_free(next_channel);

#endif

        SoundSlots[next_channel].soundno = soundnum;

        SoundSlots[next_channel].samples = GameSounds[soundnum].data;

        SoundSlots[next_channel].length = GameSounds[soundnum].length;

        SoundSlots[next_channel].volume = fixmul(digi_volume, volume);

        SoundSlots[next_channel].pan = pan;

        SoundSlots[next_channel].position = 0;

        SoundSlots[next_channel].looped = looping;

        SoundSlots[next_channel].playing = 1;

        SoundSlots[next_channel].soundobj = soundobj;

        SoundSlots[next_channel].persistent = 0;

        if (soundobj || looping || volume > F1_0)

                SoundSlots[next_channel].persistent = 1;

        i = next_channel;

        next_channel++;

        if (next_channel >= digi_max_channels)

                next_channel = 0;

        SDL_UnlockAudio();

        return i;

}

//added on 980905 by adb from original source to make sfx volume work

void digi_audio_set_digi_volume( int dvolume )

{

        dvolume = fixmuldiv( dvolume, SOUND_MAX_VOLUME, 0x7fff);

        if ( dvolume > SOUND_MAX_VOLUME )

                digi_volume = SOUND_MAX_VOLUME;

        else if ( dvolume < 0 )

                digi_volume = 0;

        else

                digi_volume = dvolume;

        if ( !digi_initialised ) return;

        digi_sync_sounds();

}

//end edit by adb

int digi_audio_is_channel_playing(int channel)

{

        if (!digi_initialised)

                return 0;

        return SoundSlots[channel].playing;

}

void digi_audio_set_channel_volume(int channel, int volume)

{

        if (!digi_initialised)

                return;

        if (!SoundSlots[channel].playing)

                return;

        SoundSlots[channel].volume = fixmuldiv(volume, digi_volume, F1_0);

}

void digi_audio_set_channel_pan(int channel, int pan)

{

        if (!digi_initialised)

                return;

        if (!SoundSlots[channel].playing)

                return;

        SoundSlots[channel].pan = pan;

}

void digi_audio_stop_sound(int channel)

{

        digi_audio_stop_sound(SoundSlots[channel]);

}

void digi_audio_end_sound(int channel)

{

        if (!digi_initialised)

                return;

        if (!SoundSlots[channel].playing)

                return;

        SoundSlots[channel].soundobj = sound_object_none;

        SoundSlots[channel].persistent = 0;

}

}