/*
* This file is part of the DXX-Rebirth project .
* 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
#include
#include
#include
#include
#include "dxxerror.h"
#include "vecmat.h"
#include "digi.h"
#include "sounds.h"
#include "config.h"
#include "args.h"
//changed on 980905 by adb to increase number of concurrent sounds
#define MAX_SOUND_SLOTS 32
//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.
*/
static const Uint8 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;
int playing; // Is there a sample playing on this channel?
int looped; // Play this sample looped?
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;
//end changes by adb
unsigned int length; // Length of the sample
unsigned int position; // Position we are at at the moment.
int soundobj; // Which soundobject is on this channel
int persistent; // This can't be pre-empted
} SoundSlots[MAX_SOUND_SLOTS];
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 *userdata, Uint8 *stream, int len)
{
Uint8 *streamend = stream + len;
struct sound_slot *sl;
if (!digi_initialised)
return;
memset(stream, 0x80, len); // fix "static" sound bug on Mac OS X
SDL_LockAudio();
for (sl = SoundSlots; sl < SoundSlots + MAX_SOUND_SLOTS; sl++) {
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()
{
for (int i = 0; i < MAX_SOUND_SLOTS; i++)
digi_audio_stop_sound(i);
}
// Volume 0-F1_0
int digi_audio_start_sound(short soundnum, fix volume, int pan, int looping, int loop_start, int loop_end, int soundobj)
{
int i, starting_channel;
if (!digi_initialised) return -1;
if (soundnum < 0) return -1;
SDL_LockAudio();
Assert(GameSounds[soundnum].data != (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 > -1)
{
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 > -1) || (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)
{
SoundSlots[channel].playing=0;
SoundSlots[channel].soundobj = -1;
SoundSlots[channel].persistent = 0;
}
void digi_audio_end_sound(int channel)
{
if (!digi_initialised)
return;
if (!SoundSlots[channel].playing)
return;
SoundSlots[channel].soundobj = -1;
SoundSlots[channel].persistent = 0;
}
#ifndef NDEBUG
void digi_audio_debug()
{
int n_voices = 0;
if (!digi_initialised)
return;
for (int i = 0; i < digi_max_channels; i++)
{
if (digi_is_channel_playing(i))
n_voices++;
}
}
#endif