OpenTTD-patches/sound.c

342 lines
7.1 KiB
C
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#include "stdafx.h"
#include "ttd.h"
#include "sound.h"
#include "vehicle.h"
#include "window.h"
#include "viewport.h"
#include "fileio.h"
typedef struct {
// Mixer
Mixer *mx;
bool active;
// pointer to allocated buffer memory
void *memory;
// current position in memory
uint32 pos;
uint32 frac_pos;
uint32 frac_speed;
uint32 samples_left;
// Mixing volume
uint volume_left;
uint volume_right;
uint flags;
} MixerChannel;
typedef struct FileEntry FileEntry;
struct FileEntry {
uint32 file_offset;
uint32 file_size;
uint16 rate;
uint8 bits_per_sample;
uint8 channels;
};
struct Mixer {
uint32 play_rate;
FileEntry *files;
uint32 file_count;
MixerChannel channels[8];
};
enum {
MX_AUTOFREE = 1,
// MX_8BIT = 2,
// MX_STEREO = 4,
MX_UNSIGNED = 8,
};
#define SOUND_SLOT 31
FILE *out;
static void mix_int8_to_int16(MixerChannel *sc, int16 *buffer, uint samples)
{
int8 *b;
uint32 frac_pos;
uint32 frac_speed;
uint volume_left;
uint volume_right;
if (samples > sc->samples_left) samples = sc->samples_left;
sc->samples_left -= samples;
assert(samples > 0);
b = (int8*)sc->memory + sc->pos;
frac_pos = sc->frac_pos;
frac_speed = sc->frac_speed;
volume_left = sc->volume_left;
volume_right = sc->volume_right;
if (frac_speed == 0x10000) {
// Special case when frac_speed is 0x10000
do {
buffer[0]+= *b * volume_left >> 8;
buffer[1]+= *b * volume_right >> 8;
b++;
buffer += 2;
} while (--samples);
} else {
do {
buffer[0] += *b * volume_left >> 8;
buffer[1] += *b * volume_right >> 8;
buffer += 2;
frac_pos += frac_speed;
b += frac_pos >> 16;
frac_pos &= 0xffff;
} while (--samples);
}
sc->frac_pos = frac_pos;
sc->pos = b - (int8*)sc->memory;
}
static void MxCloseChannel(MixerChannel *mc)
{
void *mem = mc->memory;
mc->memory = NULL;
mc->active = false;
if (mc->flags & MX_AUTOFREE)
free(mem);
}
void MxMixSamples(Mixer *mx, void *buffer, uint samples)
{
int i;
MixerChannel *mc;
// Clear the buffer
memset(buffer, 0, sizeof(int16)*2*samples);
// Mix each channel
for(i=0,mc=mx->channels; i!=lengthof(mx->channels); i++,mc++) {
if (mc->active) {
mix_int8_to_int16(mc, (int16*)buffer, samples);
if (mc->samples_left == 0) {
MxCloseChannel(mc);
}
}
}
// if (out == NULL)
// out = fopen("d:\\dump.raw", "wb");
// fwrite(buffer, samples*4, 1, out);
}
static MixerChannel *MxAllocateChannel(Mixer *mx)
{
int i;
MixerChannel *mc;
for(i=0,mc=mx->channels; i!=lengthof(mx->channels); i++,mc++)
if (!mc->memory) {
mc->active = false;
mc->mx = mx;
return mc;
}
return NULL;
}
static void MxSetChannelRawSrc(MixerChannel *mc, void *mem, uint size, uint rate, uint flags)
{
mc->memory = mem;
mc->flags = flags;
mc->frac_pos = 0;
mc->pos = 0;
mc->frac_speed = (rate<<16) / mc->mx->play_rate;
// adjust the magnitude to prevent overflow
while (size & 0xFFFF0000)
size >>= 1, rate = (rate >> 1) + 1;
mc->samples_left = size * mc->mx->play_rate / rate;
}
static void MxSetChannelVolume(MixerChannel *mc, uint left, uint right)
{
mc->volume_left = left;
mc->volume_right = right;
}
static void MxOpenBankFile(Mixer *mx, const char *filename)
{
uint count, i;
uint32 size, tag;
FileEntry *fe;
FioOpenFile(SOUND_SLOT, filename);
mx->file_count = count = FioReadDword() >> 3;
fe = mx->files = calloc(sizeof(FileEntry), count);
FioSeekTo(0, SEEK_SET);
for(i=0; i!=count; i++,fe++) {
fe->file_offset = FioReadDword();
fe->file_size = FioReadDword();
}
fe = mx->files;
for(i=0; i!=count; i++,fe++) {
FioSeekTo(fe->file_offset, SEEK_SET);
// Skip past string and the name.
FioSeekTo(FioReadByte() + 12, SEEK_CUR);
// Read riff tags
while(true) {
tag = FioReadDword();
size = FioReadDword();
if (tag == ' tmf') {
FioReadWord(); // wFormatTag
fe->channels = FioReadWord(); // wChannels
FioReadDword(); // samples per second
fe->rate = 11025; // seems like all samples should be played at this rate.
FioReadDword(); // avg bytes per second
FioReadWord(); // alignment
fe->bits_per_sample = FioReadByte(); // bits per sample
FioSeekTo(size - (2+2+4+4+2+1), SEEK_CUR);
} else if (tag == 'atad') {
fe->file_size = size;
fe->file_offset = FioGetPos() | (SOUND_SLOT << 24);
break;
} else {
fe->file_size = 0;
break;
}
}
}
}
static bool MxSetBankSource(MixerChannel *mc, uint bank)
{
FileEntry *fe = &mc->mx->files[bank];
void *mem;
uint i;
if (fe->file_size == 0)
return false;
mem = malloc(fe->file_size);
FioSeekToFile(fe->file_offset);
FioReadBlock(mem, fe->file_size);
for(i=0; i!=fe->file_size; i++) {
((byte*)mem)[i] ^= 0x80;
}
assert(fe->bits_per_sample == 8 && fe->channels == 1 && fe->file_size != 0 && fe->rate != 0);
MxSetChannelRawSrc(mc, mem, fe->file_size, fe->rate, MX_AUTOFREE | MX_UNSIGNED);
return true;
}
bool MxInitialize(uint rate, const char *filename)
{
static Mixer mx;
_mixer = &mx;
mx.play_rate = rate;
MxOpenBankFile(&mx, filename);
return true;
}
// Low level sound player
static void StartSound(uint sound, uint panning, uint volume)
{
if (volume != 0) {
MixerChannel *mc = MxAllocateChannel(_mixer);
if (mc == NULL)
return;
if (MxSetBankSource(mc, sound)) {
MxSetChannelVolume(mc, volume << 8, volume << 8);
mc->active = true;
}
}
}
static const byte _vol_factor_by_zoom[] = {255, 190, 134};
static const byte _sound_base_vol[] = {
128, 90, 128, 128, 128, 128, 128, 128,
128, 90, 90, 128, 128, 128, 128, 128,
128, 128, 128, 80, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 90, 90, 90, 128, 90, 128,
128, 90, 128, 128, 128, 90, 128, 128,
128, 128, 128, 128, 90, 128, 128, 128,
128, 90, 128, 128, 128, 128, 128, 128,
128, 128, 90, 90, 90, 128, 128, 128,
90,
};
static const byte _sound_idx[] = {
2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17,
18, 19, 20, 21, 22, 23, 24, 25,
26, 27, 28, 29, 30, 31, 32, 33,
34, 35, 36, 37, 38, 39, 40, 0,
1, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63,
64, 65, 66, 67, 68, 69, 70, 71,
72,
};
void SndPlayScreenCoordFx(int sound, int x, int y)
{
Window *w;
ViewPort *vp;
int left;
if (msf.effect_vol == 0)
return;
for(w=_windows; w!=_last_window; w++) {
if ((vp=w->viewport) &&
IS_INSIDE_1D(x, vp->virtual_left, vp->virtual_width) &&
IS_INSIDE_1D(y, vp->virtual_top, vp->virtual_height)) {
left = ((x - vp->virtual_left) >> vp->zoom) + vp->left;
StartSound(
_sound_idx[sound],
clamp(left / 71, 0, 8),
(_sound_base_vol[sound] * msf.effect_vol * _vol_factor_by_zoom[vp->zoom]) >> 15
);
return;
}
}
}
void SndPlayTileFx(int sound, TileIndex tile)
{
int x = GET_TILE_X(tile)*16;
int y = GET_TILE_Y(tile)*16;
Point pt = RemapCoords(x,y, GetSlopeZ(x+8, y+8));
SndPlayScreenCoordFx(sound, pt.x, pt.y);
}
void SndPlayVehicleFx(int sound, Vehicle *v)
{
SndPlayScreenCoordFx(sound,
(v->left_coord + v->right_coord) >> 1,
(v->top_coord + v->bottom_coord) >> 1
);
}
void SndPlayFx(int sound)
{
StartSound(
_sound_idx[sound],
4,
(_sound_base_vol[sound] * msf.effect_vol) >> 7
);
}