author | tron |
Fri, 05 Nov 2004 23:12:33 +0000 | |
changeset 337 | 66647f97e7c0 |
parent 193 | 0a7025304867 |
child 679 | e959706a3e4d |
permissions | -rw-r--r-- |
0 | 1 |
#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 MixerChannel { |
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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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int8 *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 { |
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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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} FileEntry; |
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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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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 = 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 > 0); |
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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 > 0); |
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} |
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sc->frac_pos = frac_pos; |
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sc->pos = b - sc->memory; |
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} |
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static void MxCloseChannel(MixerChannel *mc) |
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{ |
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if (mc->flags & MX_AUTOFREE) free(mc->memory); |
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mc->memory = NULL; |
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mc->active = false; |
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101 |
} |
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void MxMixSamples(Mixer *mx, void *buffer, uint samples) |
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{ |
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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 (mc = mx->channels; mc != endof(mx->channels); mc++) { |
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if (mc->active) { |
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mix_int8_to_int16(mc, buffer, samples); |
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if (mc->samples_left == 0) MxCloseChannel(mc); |
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} |
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} |
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#if 0 |
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{ |
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static FILE *out = NULL; |
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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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#endif |
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} |
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static MixerChannel *MxAllocateChannel(Mixer *mx) |
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{ |
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MixerChannel *mc; |
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for (mc = mx->channels; mc != endof(mx->channels); mc++) |
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if (mc->memory == NULL) { |
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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, int8 *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; |
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rate = (rate >> 1) + 1; |
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} |
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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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char name[255]; |
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FioSeekTo(fe->file_offset, SEEK_SET); |
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// Check for special case, see else case |
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FioReadBlock(name, FioReadByte()); // Read the name of the sound |
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if (strcmp(name, "Corrupt sound") != 0) { |
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FioSeekTo(12, SEEK_CUR); // Skip past RIFF header |
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// Read riff tags |
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for (;;) { |
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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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} |
0 | 214 |
} |
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} else { |
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/* |
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* Special case for the jackhammer sound |
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* (name in sample.cat is "Corrupt sound") |
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* It's no RIFF file, but raw PCM data |
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*/ |
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fe->channels = 1; |
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fe->rate = 11025; |
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fe->bits_per_sample = 8; |
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fe->file_offset = FioGetPos() | (SOUND_SLOT << 24); |
0 | 225 |
} |
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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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int8 *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); /* XXX unchecked malloc */ |
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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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mem[i] -= 128; // Convert unsigned sound data to signed |
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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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static void SndPlayScreenCoordFx(SoundFx 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) != NULL && |
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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(SoundFx sound, TileIndex tile) |
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{ |
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/* emits sound from center (+ 8) of the tile */ |
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int x = GET_TILE_X(tile) * 16 + 8; |
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int y = GET_TILE_Y(tile) * 16 + 8; |
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Point pt = RemapCoords(x, y, GetSlopeZ(x, y)); |
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SndPlayScreenCoordFx(sound, pt.x, pt.y); |
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} |
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void SndPlayVehicleFx(SoundFx sound, const Vehicle *v) |
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{ |
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SndPlayScreenCoordFx(sound, |
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(v->left_coord + v->right_coord) / 2, |
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(v->top_coord + v->bottom_coord) / 2 |
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); |
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} |
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void SndPlayFx(SoundFx 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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} |