audio.c

   1 #include "audio.h"
   2 #define AUDIO_BACKEND_AO 1
   3 #define AUDIO_BACKEND_SDL 2
   4 #ifndef AUDIO_BACKEND
   5 #define AUDIO_BACKEND AUDIO_BACKEND_AO
   6 #endif
   7
   8 #if AUDIO_BACKEND == AUDIO_BACKEND_AO
   9 //RcB: SKIPON "AUDIO_BACKEND=AUDIO_BACKEND_SDL"
  10 #include "../c-flod/backends/aowriter.h"
  11 //RcB: SKIPOFF "AUDIO_BACKEND=AUDIO_BACKEND_SDL"
  12 #define BACKEND_STRUCT AoWriter
  13 #define BACKEND_INIT AoWriter_init
  14 #define BACKEND_CLOSE AoWriter_close
  15 #define BACKEND_WRITE AoWriter_write
  16 #else
  17 //RcB: SKIPON "AUDIO_BACKEND=AUDIO_BACKEND_AO"
  18 #include "../c-flod/backends/sdlwriter.h"
  19 //RcB: SKIPOFF "AUDIO_BACKEND=AUDIO_BACKEND_AO"
  20 #define BACKEND_STRUCT SdlWriter
  21 #define BACKEND_INIT SdlWriter_init
  22 #define BACKEND_CLOSE SdlWriter_close
  23 #define BACKEND_WRITE SdlWriter_write
  24
  25 #endif
  26 #include "../c-flod/backends/wave_format.h"
  27 #include "../c-flod/neoart/flod/core/CorePlayer.h"
  28 #include "../c-flod/neoart/flod/whittaker/DWPlayer.h"
  29 #include "../c-flod/flashlib/ByteArray.h"
  30 #include "../c-flod/neoart/flod/core/Amiga.h"
  31 #include <assert.h>
  32 #include <pthread.h>
  33 #include <errno.h>
  34 #include "../lib/include/timelib.h"
  35 //RcB: LINK "-lpthread"
  36
  37 enum thread_status {
  38         TS_WAITING,
  39         TS_PLAYING,
  40         TS_DONE,
  41         TS_STOPPING,
  42 };
  43
  44 struct AudioPlayer {
  45         union {
  46                 struct CorePlayer core;
  47                 struct DWPlayer dw;
  48         } player;
  49         union {
  50                 struct CoreMixer core;
  51                 struct Amiga amiga;
  52         } hardware;
  53         union {
  54                 struct Backend backend;
  55                 struct BACKEND_STRUCT ao;
  56         } writer;
  57         struct ByteArray music_stream;
  58         struct ByteArray wave_streams[2];
  59         WAVE_HEADER_COMPLETE wavhdr;
  60         struct ByteArray out_wave;
  61         char wave_buffer[COREMIXER_MAX_BUFFER * 2 * sizeof(float)];
  62         pthread_attr_t attr;
  63         pthread_t thread;
  64         pthread_mutex_t music_mutex;
  65         pthread_mutex_t sound_mutex;
  66         enum thread_status thread_music_status;
  67         int free_waveslot;
  68         int play_waveslot;
  69         int empty_track_active;
  70 };
  71
  72 static struct AudioPlayer playa;
  73
  74 #define mlock() pthread_mutex_lock(&playa.music_mutex)
  75 #define munlock() pthread_mutex_unlock(&playa.music_mutex)
  76 #define slock() pthread_mutex_lock(&playa.sound_mutex)
  77 #define sunlock() pthread_mutex_unlock(&playa.sound_mutex)
  78
  79 static int handle_overflow(int *sample) {
  80         if(*sample > 32767) {
  81                 *sample = 32767;
  82                 return 1;
  83         } else if (*sample < -32768) {
  84                 *sample = -32768;
  85                 return -1;
  86         }
  87         return 0;
  88 }
  89
  90 #define MUSIC_FINISHED() (!playa.empty_track_active && CoreMixer_get_complete(&playa.hardware.core))
  91 #define GEN_MUSIC() do{ \
  92                         if(!playa.empty_track_active) playa.hardware.core.accurate(&playa.hardware.core); \
  93                         else { assert(sizeof(playa.wave_buffer) >= 1024*3); \
  94                                memset(playa.wave_buffer, 0, 1024*3); playa.out_wave.pos = 1024*3;}  \
  95                       } while (0)
  96 #define MUSIC_AVAIL() (playa.out_wave.pos)
  97 #define GET_MUSIC_WORD() (playa.empty_track_active ? 0 : ByteArray_readShort(out))
  98 #define MUSIC_REWIND_WORD() do { if(!playa.empty_track_active) ByteArray_set_position_rel(out, -2); } while (0)
  99
 100 static void *thread_func(void* data) {
 101         (void) data;
 102         while(1) {
 103                 mlock();
 104                 if(playa.thread_music_status == TS_STOPPING) {
 105                         playa.thread_music_status = TS_WAITING;
 106                         munlock();
 107                         msleep(1);
 108                         continue;
 109                 } else if(playa.thread_music_status == TS_DONE || playa.thread_music_status == TS_WAITING) {
 110                         munlock();
 111                         msleep(4);
 112                         continue;
 113                 }
 114                 munlock();
 115                 if(MUSIC_FINISHED()) {
 116                         mlock();
 117                         playa.thread_music_status = TS_DONE;
 118                         munlock();
 119                         continue;
 120                 }
 121                 GEN_MUSIC();
 122                 if(MUSIC_AVAIL()) {
 123                         //dprintf(2, "writing %zu bytes...\n", (size_t) playa.out_wave.pos);
 124                         slock();
 125                         if(playa.play_waveslot != -1) {
 126                                 struct ByteArray* mine = &playa.wave_streams[playa.play_waveslot];
 127                                 if(!mine->bytesAvailable(mine)) {
 128                                         playa.play_waveslot = -1;
 129                                         goto mixin_done;
 130                                 }
 131                                 struct ByteArray* out = &playa.out_wave;
 132                                 off_t savepos = out->pos;
 133                                 size_t avail = mine->bytesAvailable(mine);
 134                                 size_t upsample_factor = 44100 / playa.wavhdr.wave_hdr.samplerate;
 135                                 size_t processed_m = 0, processed_w = 0;
 136                                 size_t readbytes = playa.wavhdr.wave_hdr.bitwidth == 8 ? 1 : 2;
 137                                 int chan[2] = { 0, 0 };
 138                                 int next[2];
 139                                 ByteArray_set_position(out, 0);
 140                                 while(processed_m < (size_t)savepos && processed_w < avail) {
 141                                         size_t c, u;
 142                                         for(c = 0; c < 2; c++) {
 143                                                 if(c < playa.wavhdr.wave_hdr.channels) {
 144                                                         if(readbytes == 1) next[c] = ((uint8_t) ByteArray_readByte(mine) - 128) * 256;
 145                                                         else next[c] = ByteArray_readShort(mine);
 146                                                         handle_overflow(&next[c]);
 147                                                 } else
 148                                                         next[c] = next[c - 1];
 149                                                 processed_w += readbytes;
 150                                         }
 151                                         for(u = 0; u < upsample_factor; u++) {
 152                                                 for(c = 0; c < 2; c++) {
 153                                                         int interpolated = u == 0 ? chan[c] :
 154                                                                 chan[c] + ((next[c]-chan[c]) * ((float)u/(float)upsample_factor));
 155                                                         interpolated = (float) interpolated * 0.3; // decrease volume to avoid overflow
 156                                                         int music = GET_MUSIC_WORD();
 157                                                         int sample = music + interpolated;
 158                                                         if(handle_overflow(&sample)) dprintf(2, "overflow\n");
 159                                                         MUSIC_REWIND_WORD();
 160                                                         ByteArray_writeShort(out, sample);
 161                                                         processed_m += 2;
 162                                                 }
 163                                         }
 164                                         for (c=0; c<2; c++) chan[c] = next[c];
 165                                 }
 166                                 ByteArray_set_position(out, savepos);
 167                         }
 168                         mixin_done:
 169                         sunlock();
 170                         BACKEND_WRITE(&playa.writer.ao, playa.wave_buffer, playa.out_wave.pos);
 171                         //dprintf(2, "done\n");
 172                         playa.out_wave.pos = 0;
 173                 }
 174         }
 175         return 0;
 176 }
 177
 178 void audio_init(void) {
 179         Amiga_ctor(&playa.hardware.amiga);
 180         DWPlayer_ctor(&playa.player.dw, &playa.hardware.amiga);
 181         BACKEND_INIT(&playa.writer.ao, 0);
 182         ByteArray_ctor(&playa.music_stream);
 183         ByteArray_ctor(&playa.wave_streams[0]);
 184         ByteArray_ctor(&playa.wave_streams[1]);
 185         ByteArray_ctor(&playa.out_wave);
 186         playa.out_wave.endian = BAE_LITTLE;
 187         ByteArray_open_mem(&playa.out_wave, playa.wave_buffer, sizeof(playa.wave_buffer));
 188         playa.hardware.core.wave = &playa.out_wave;
 189
 190         playa.thread_music_status = TS_WAITING;
 191         errno = pthread_mutex_init(&playa.music_mutex, 0);
 192         if(errno) perror("1");
 193         errno = pthread_mutex_init(&playa.sound_mutex, 0);
 194         if(errno) perror("1.5");
 195         errno = pthread_attr_init(&playa.attr);
 196         if(errno) perror("2");
 197         errno = pthread_attr_setstacksize(&playa.attr, 128*1024);
 198         if(errno) perror("3");
 199         errno = pthread_create(&playa.thread, &playa.attr, thread_func, 0);
 200         if(errno) perror("4");
 201         playa.free_waveslot = 0;
 202         playa.play_waveslot = -1;
 203 }
 204
 205 int audio_open_music_resource(const unsigned char* data, size_t data_size, int track) {
 206         mlock();
 207         if(playa.thread_music_status != TS_WAITING) {
 208                 playa.thread_music_status = TS_STOPPING;
 209                 munlock();
 210                 int done = 0;
 211                 do {
 212                         mlock();
 213                         if(playa.thread_music_status == TS_WAITING) done = 1;
 214                         munlock();
 215                         if(!done) msleep(1);
 216                 } while(!done);
 217                 mlock();
 218         }
 219         playa.empty_track_active = 0;
 220         munlock();
 221         if(track == -1) { /* "empty" track */
 222                 playa.empty_track_active = 1;
 223                 memset(playa.wave_buffer, 0, sizeof(playa.wave_buffer));
 224                 return 0;
 225         }
 226         ByteArray_open_mem(&playa.music_stream, (void*) data, data_size);
 227         CorePlayer_load(&playa.player.core, &playa.music_stream);
 228         assert(playa.player.core.version);
 229         if(track > playa.player.core.lastSong) return -1;
 230         playa.player.core.playSong = track;
 231         playa.player.core.initialize(&playa.player.core);
 232         return 0;
 233 }
 234
 235 #if 0
 236 //FIXME: does not close file handle
 237 int audio_open_music(const char* filename, int track) {
 238         mlock();
 239         if(playa.thread_music_status != TS_WAITING) {
 240                 playa.thread_music_status = TS_STOPPING;
 241                 munlock();
 242                 int done = 0;
 243                 do {
 244                         mlock();
 245                         if(playa.thread_music_status == TS_WAITING) done = 1;
 246                         munlock();
 247                         if(!done) msleep(1);
 248                 } while(!done);
 249                 mlock();
 250         }
 251         munlock();
 252         ByteArray_open_file(&playa.music_stream, filename);
 253         CorePlayer_load(&playa.player.core, &playa.music_stream);
 254         assert(playa.player.core.version);
 255         playa.player.core.initialize(&playa.player.core);
 256         if(track > playa.player.core.lastSong) return -1;
 257         playa.player.core.playSong = track;
 258         return 0;
 259 }
 260 #endif
 261
 262
 263 void audio_play_wave_resource(const WAVE_HEADER_COMPLETE* wave) {
 264         if(!wave) return;
 265         slock();
 266         if(playa.free_waveslot >= (int) ARRAY_SIZE(playa.wave_streams)) {
 267                 playa.free_waveslot = 0;
 268         }
 269         struct ByteArray *mine = &playa.wave_streams[playa.free_waveslot];
 270         if(!ByteArray_open_mem(mine, waveheader_get_data(wave), waveheader_get_datasize(wave))) {
 271                 abort();
 272         }
 273         ByteArray_set_endian(mine, BAE_LITTLE);
 274         playa.wavhdr = *wave;
 275
 276         playa.play_waveslot = playa.free_waveslot;
 277         playa.free_waveslot++;
 278         sunlock();
 279 }
 280
 281 #if 0
 282 static void close_all_but_playing_slot() {
 283         size_t i;
 284         for(i = 0; i < ARRAY_SIZE(playa.wave_streams); i++) {
 285                 /*if(i != playa.play_waveslot) */
 286                         ByteArray_close_file(&playa.wave_streams[i]);
 287         }
 288 }
 289 void audio_play_wav(const char* filename) {
 290         slock();
 291         if(playa.free_waveslot >= (int) ARRAY_SIZE(playa.wave_streams)) {
 292                 playa.free_waveslot = 0;
 293                 close_all_but_playing_slot();
 294         }
 295         struct ByteArray *mine = &playa.wave_streams[playa.free_waveslot];
 296         if(!ByteArray_open_file(mine, filename)) {
 297                 perror("open");
 298                 abort();
 299         }
 300         ByteArray_set_endian(mine, BAE_LITTLE);
 301         /* assuming 16bit, 44khz stereo wav for the beginning. */
 302         ByteArray_readMultiByte(mine, (void*) &playa.wavhdr, sizeof(WAVE_HEADER_COMPLETE));
 303         //ByteArray_set_position(mine, sizeof(WAVE_HEADER_COMPLETE));
 304
 305         playa.play_waveslot = playa.free_waveslot;
 306         playa.free_waveslot++;
 307         sunlock();
 308 }
 309 #endif
 310
 311 // return -1: when track is finished, 0 if something was played, 1 if nothing was played.
 312 int audio_process(void) {
 313         mlock();
 314         if(playa.thread_music_status == TS_DONE) {
 315                 munlock();
 316                 return -1;
 317         } else if (playa.thread_music_status == TS_WAITING) {
 318                 playa.thread_music_status = TS_PLAYING;
 319         }
 320         munlock();
 321         return 0;
 322 }
 323
 324