forked from mirror/OpenTTD
(svn r2000) Split the sound system into backend (mixer.[ch]) and frontend (sound.[ch])
This commit is contained in:
tron
176
sound.c
176
sound.c
@@ -1,33 +1,13 @@
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#include "stdafx.h"
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#include "ttd.h"
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#include "map.h"
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#include "mixer.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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@@ -36,150 +16,29 @@ typedef struct FileEntry {
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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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static uint _file_count;
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static FileEntry* _files;
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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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}
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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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static void OpenBankFile(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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_file_count = count = FioReadDword() >> 3;
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fe = _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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for (i = 0; i != count; i++) {
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fe[i].file_offset = FioReadDword();
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fe[i].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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@@ -227,9 +86,9 @@ static void MxOpenBankFile(Mixer *mx, const char *filename)
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}
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}
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static bool MxSetBankSource(MixerChannel *mc, uint bank)
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static bool SetBankSource(MixerChannel *mc, uint bank)
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{
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FileEntry *fe = &mc->mx->files[bank];
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FileEntry *fe = &_files[bank];
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int8 *mem;
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uint i;
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@@ -245,17 +104,14 @@ static bool MxSetBankSource(MixerChannel *mc, uint bank)
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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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MxSetChannelRawSrc(mc, mem, fe->file_size, fe->rate, MX_AUTOFREE);
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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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bool SoundInitialize(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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OpenBankFile(filename);
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return true;
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}
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@@ -266,9 +122,9 @@ static void StartSound(uint sound, uint panning, uint volume)
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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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if (SetBankSource(mc, sound)) {
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MxSetChannelVolume(mc, volume << 8, volume << 8);
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mc->active = true;
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MxActivate(mc);
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}
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}
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}
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