--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sound.c Mon Aug 09 17:04:08 2004 +0000
@@ -0,0 +1,341 @@
+#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
+ );
+}