mirror of
https://github.com/JGRennison/OpenTTD-patches.git
synced 2024-11-11 13:10:45 +00:00
342 lines
7.1 KiB
C
342 lines
7.1 KiB
C
#include "stdafx.h"
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#include "ttd.h"
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#include "sound.h"
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#include "vehicle.h"
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#include "window.h"
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#include "viewport.h"
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#include "fileio.h"
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typedef struct {
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// Mixer
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Mixer *mx;
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bool active;
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// pointer to allocated buffer memory
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void *memory;
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// current position in memory
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uint32 pos;
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uint32 frac_pos;
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uint32 frac_speed;
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uint32 samples_left;
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// Mixing volume
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uint volume_left;
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uint volume_right;
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uint flags;
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} MixerChannel;
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typedef struct FileEntry FileEntry;
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struct FileEntry {
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uint32 file_offset;
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uint32 file_size;
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uint16 rate;
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uint8 bits_per_sample;
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uint8 channels;
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};
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struct Mixer {
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uint32 play_rate;
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FileEntry *files;
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uint32 file_count;
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MixerChannel channels[8];
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};
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enum {
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MX_AUTOFREE = 1,
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// MX_8BIT = 2,
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// MX_STEREO = 4,
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MX_UNSIGNED = 8,
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};
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#define SOUND_SLOT 31
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FILE *out;
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static void mix_int8_to_int16(MixerChannel *sc, int16 *buffer, uint samples)
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{
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int8 *b;
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uint32 frac_pos;
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uint32 frac_speed;
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uint volume_left;
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uint volume_right;
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if (samples > sc->samples_left) samples = sc->samples_left;
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sc->samples_left -= samples;
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assert(samples > 0);
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b = (int8*)sc->memory + sc->pos;
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frac_pos = sc->frac_pos;
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frac_speed = sc->frac_speed;
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volume_left = sc->volume_left;
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volume_right = sc->volume_right;
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if (frac_speed == 0x10000) {
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// Special case when frac_speed is 0x10000
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do {
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buffer[0]+= *b * volume_left >> 8;
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buffer[1]+= *b * volume_right >> 8;
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b++;
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buffer += 2;
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} while (--samples);
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} else {
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do {
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buffer[0] += *b * volume_left >> 8;
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buffer[1] += *b * volume_right >> 8;
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buffer += 2;
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frac_pos += frac_speed;
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b += frac_pos >> 16;
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frac_pos &= 0xffff;
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} while (--samples);
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}
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sc->frac_pos = frac_pos;
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sc->pos = b - (int8*)sc->memory;
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}
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static void MxCloseChannel(MixerChannel *mc)
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{
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void *mem = mc->memory;
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mc->memory = NULL;
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mc->active = false;
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if (mc->flags & MX_AUTOFREE)
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free(mem);
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}
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void MxMixSamples(Mixer *mx, void *buffer, uint samples)
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{
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int i;
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MixerChannel *mc;
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// Clear the buffer
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memset(buffer, 0, sizeof(int16)*2*samples);
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// Mix each channel
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for(i=0,mc=mx->channels; i!=lengthof(mx->channels); i++,mc++) {
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if (mc->active) {
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mix_int8_to_int16(mc, (int16*)buffer, samples);
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if (mc->samples_left == 0) {
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MxCloseChannel(mc);
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}
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}
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}
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// if (out == NULL)
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// out = fopen("d:\\dump.raw", "wb");
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// fwrite(buffer, samples*4, 1, out);
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}
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static MixerChannel *MxAllocateChannel(Mixer *mx)
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{
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int i;
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MixerChannel *mc;
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for(i=0,mc=mx->channels; i!=lengthof(mx->channels); i++,mc++)
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if (!mc->memory) {
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mc->active = false;
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mc->mx = mx;
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return mc;
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}
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return NULL;
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}
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static void MxSetChannelRawSrc(MixerChannel *mc, void *mem, uint size, uint rate, uint flags)
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{
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mc->memory = mem;
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mc->flags = flags;
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mc->frac_pos = 0;
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mc->pos = 0;
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mc->frac_speed = (rate<<16) / mc->mx->play_rate;
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// adjust the magnitude to prevent overflow
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while (size & 0xFFFF0000)
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size >>= 1, rate = (rate >> 1) + 1;
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mc->samples_left = size * mc->mx->play_rate / rate;
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}
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static void MxSetChannelVolume(MixerChannel *mc, uint left, uint right)
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{
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mc->volume_left = left;
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mc->volume_right = right;
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}
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static void MxOpenBankFile(Mixer *mx, const char *filename)
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{
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uint count, i;
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uint32 size, tag;
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FileEntry *fe;
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FioOpenFile(SOUND_SLOT, filename);
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mx->file_count = count = FioReadDword() >> 3;
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fe = mx->files = calloc(sizeof(FileEntry), count);
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FioSeekTo(0, SEEK_SET);
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for(i=0; i!=count; i++,fe++) {
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fe->file_offset = FioReadDword();
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fe->file_size = FioReadDword();
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}
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fe = mx->files;
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for(i=0; i!=count; i++,fe++) {
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FioSeekTo(fe->file_offset, SEEK_SET);
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// Skip past string and the name.
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FioSeekTo(FioReadByte() + 12, SEEK_CUR);
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// Read riff tags
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while(true) {
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tag = FioReadDword();
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size = FioReadDword();
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if (tag == ' tmf') {
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FioReadWord(); // wFormatTag
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fe->channels = FioReadWord(); // wChannels
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FioReadDword(); // samples per second
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fe->rate = 11025; // seems like all samples should be played at this rate.
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FioReadDword(); // avg bytes per second
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FioReadWord(); // alignment
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fe->bits_per_sample = FioReadByte(); // bits per sample
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FioSeekTo(size - (2+2+4+4+2+1), SEEK_CUR);
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} else if (tag == 'atad') {
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fe->file_size = size;
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fe->file_offset = FioGetPos() | (SOUND_SLOT << 24);
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break;
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} else {
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fe->file_size = 0;
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break;
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}
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}
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}
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}
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static bool MxSetBankSource(MixerChannel *mc, uint bank)
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{
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FileEntry *fe = &mc->mx->files[bank];
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void *mem;
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uint i;
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if (fe->file_size == 0)
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return false;
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mem = malloc(fe->file_size);
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FioSeekToFile(fe->file_offset);
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FioReadBlock(mem, fe->file_size);
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for(i=0; i!=fe->file_size; i++) {
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((byte*)mem)[i] ^= 0x80;
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}
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assert(fe->bits_per_sample == 8 && fe->channels == 1 && fe->file_size != 0 && fe->rate != 0);
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MxSetChannelRawSrc(mc, mem, fe->file_size, fe->rate, MX_AUTOFREE | MX_UNSIGNED);
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return true;
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}
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bool MxInitialize(uint rate, const char *filename)
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{
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static Mixer mx;
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_mixer = &mx;
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mx.play_rate = rate;
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MxOpenBankFile(&mx, filename);
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return true;
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}
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// Low level sound player
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static void StartSound(uint sound, uint panning, uint volume)
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{
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if (volume != 0) {
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MixerChannel *mc = MxAllocateChannel(_mixer);
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if (mc == NULL)
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return;
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if (MxSetBankSource(mc, sound)) {
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MxSetChannelVolume(mc, volume << 8, volume << 8);
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mc->active = true;
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}
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}
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}
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static const byte _vol_factor_by_zoom[] = {255, 190, 134};
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static const byte _sound_base_vol[] = {
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128, 90, 128, 128, 128, 128, 128, 128,
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128, 90, 90, 128, 128, 128, 128, 128,
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128, 128, 128, 80, 128, 128, 128, 128,
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128, 128, 128, 128, 128, 128, 128, 128,
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128, 128, 90, 90, 90, 128, 90, 128,
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128, 90, 128, 128, 128, 90, 128, 128,
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128, 128, 128, 128, 90, 128, 128, 128,
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128, 90, 128, 128, 128, 128, 128, 128,
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128, 128, 90, 90, 90, 128, 128, 128,
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90,
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};
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static const byte _sound_idx[] = {
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2, 3, 4, 5, 6, 7, 8, 9,
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10, 11, 12, 13, 14, 15, 16, 17,
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18, 19, 20, 21, 22, 23, 24, 25,
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26, 27, 28, 29, 30, 31, 32, 33,
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34, 35, 36, 37, 38, 39, 40, 0,
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1, 41, 42, 43, 44, 45, 46, 47,
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48, 49, 50, 51, 52, 53, 54, 55,
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56, 57, 58, 59, 60, 61, 62, 63,
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64, 65, 66, 67, 68, 69, 70, 71,
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72,
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};
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void SndPlayScreenCoordFx(int sound, int x, int y)
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{
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Window *w;
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ViewPort *vp;
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int left;
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if (msf.effect_vol == 0)
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return;
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for(w=_windows; w!=_last_window; w++) {
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if ((vp=w->viewport) &&
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IS_INSIDE_1D(x, vp->virtual_left, vp->virtual_width) &&
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IS_INSIDE_1D(y, vp->virtual_top, vp->virtual_height)) {
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left = ((x - vp->virtual_left) >> vp->zoom) + vp->left;
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StartSound(
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_sound_idx[sound],
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clamp(left / 71, 0, 8),
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(_sound_base_vol[sound] * msf.effect_vol * _vol_factor_by_zoom[vp->zoom]) >> 15
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);
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return;
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}
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}
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}
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void SndPlayTileFx(int sound, TileIndex tile)
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{
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int x = GET_TILE_X(tile)*16;
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int y = GET_TILE_Y(tile)*16;
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Point pt = RemapCoords(x,y, GetSlopeZ(x+8, y+8));
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SndPlayScreenCoordFx(sound, pt.x, pt.y);
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}
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void SndPlayVehicleFx(int sound, Vehicle *v)
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{
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SndPlayScreenCoordFx(sound,
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(v->left_coord + v->right_coord) >> 1,
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(v->top_coord + v->bottom_coord) >> 1
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);
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}
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void SndPlayFx(int sound)
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{
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StartSound(
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_sound_idx[sound],
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4,
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(_sound_base_vol[sound] * msf.effect_vol) >> 7
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);
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}
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