apps/plugins/zxbox/spsound.c

   1 /*
   2  * Copyright (C) 1996-1998 Szeredi Miklos 2006 Anton Romanov
   3  * Email: mszeredi@inf.bme.hu
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version. See the file COPYING.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  */
  20
  21 /* #define DEBUG_AUDIO */
  22
  23 #include "spsound.h"
  24
  25 #include "zxconfig.h"
  26 #include "spperif.h"
  27 #include "z80.h"
  28 #include "zxmisc.h"
  29 #include "interf.h"
  30 #include "spmain.h"
  31
  32 #include <stdio.h>
  33
  34 int bufframes = 1;
  35
  36 int sound_avail = 0;
  37 int sound_on = 1;
  38
  39 int sound_to_autoclose = 0;
  40 int doneplay=0;
  41
  42
  43 #ifdef HAVE_SOUND
  44
  45 #include "stdlib.h"
  46 #include "file.h"
  47 #include "time.h"
  48 #include "errno.h"
  49 #include "string.h"
  50
  51
  52
  53 #define SKIPTIME 5000
  54
  55 static int last_not_played=0;
  56
  57 #define SPS_OPENED        0
  58 #define SPS_AUTOCLOSED     -1
  59 #define SPS_BUSY     -2
  60 #define SPS_CLOSED     -3
  61 #define SPS_NONEXIST     -4
  62
  63 static int sndstate = SPS_CLOSED;
  64
  65 static void close_snd(int normal);
  66 unsigned short my_buf[TMNUM*2*3*2];
  67
  68
  69 const byte lin8_ulaw[] = {
  70     31,   31,   31,   32,   32,   32,   32,   33,
  71     33,   33,   33,   34,   34,   34,   34,   35,
  72     35,   35,   35,   36,   36,   36,   36,   37,
  73     37,   37,   37,   38,   38,   38,   38,   39,
  74     39,   39,   39,   40,   40,   40,   40,   41,
  75     41,   41,   41,   42,   42,   42,   42,   43,
  76     43,   43,   43,   44,   44,   44,   44,   45,
  77     45,   45,   45,   46,   46,   46,   46,   47,
  78     47,   47,   47,   48,   48,   49,   49,   50,
  79     50,   51,   51,   52,   52,   53,   53,   54,
  80     54,   55,   55,   56,   56,   57,   57,   58,
  81     58,   59,   59,   60,   60,   61,   61,   62,
  82     62,   63,   63,   64,   65,   66,   67,   68,
  83     69,   70,   71,   72,   73,   74,   75,   76,
  84     77,   78,   79,   81,   83,   85,   87,   89,
  85     91,   93,   95,   99,  103,  107,  111,  119,
  86    255,  247,  239,  235,  231,  227,  223,  221,
  87    219,  217,  215,  213,  211,  209,  207,  206,
  88    205,  204,  203,  202,  201,  200,  199,  198,
  89    197,  196,  195,  194,  193,  192,  191,  191,
  90    190,  190,  189,  189,  188,  188,  187,  187,
  91    186,  186,  185,  185,  184,  184,  183,  183,
  92    182,  182,  181,  181,  180,  180,  179,  179,
  93    178,  178,  177,  177,  176,  176,  175,  175,
  94    175,  175,  174,  174,  174,  174,  173,  173,
  95    173,  173,  172,  172,  172,  172,  171,  171,
  96    171,  171,  170,  170,  170,  170,  169,  169,
  97    169,  169,  168,  168,  168,  168,  167,  167,
  98    167,  167,  166,  166,  166,  166,  165,  165,
  99    165,  165,  164,  164,  164,  164,  163,  163,
 100    163,  163,  162,  162,  162,  162,  161,  161,
 101    161,  161,  160,  160,  160,  160,  159,  159,
 102 };
 103
 104 static void open_snd(void)
 105 {
 106     sndstate = SPS_OPENED;
 107     sound_avail=1;
 108    rb->pcm_play_stop();
 109 #if INPUT_SRC_CAPS != 0
 110     /* Select playback */
 111     rb->audio_set_input_source(AUDIO_SRC_PLAYBACK, SRCF_PLAYBACK);
 112     rb->audio_set_output_source(AUDIO_SRC_PLAYBACK);
 113 #endif
 114     rb->pcm_set_frequency(SAMPR_44);
 115 }
 116
 117 static void close_snd(int normal)
 118 {
 119     (void)normal;
 120     sound_avail = 0;
 121     rb->pcm_play_stop();
 122     rb->pcm_set_frequency(HW_SAMPR_DEFAULT);
 123 }
 124
 125
 126
 127 void init_spect_sound(void)
 128 {
 129 #if 1 /* TODO: Is this OK? */
 130   open_snd();
 131 #endif
 132 }
 133
 134
 135 #ifndef VOLREDUCE
 136 #define VOLREDUCE 0
 137 #endif
 138
 139 #define CONVU8(x) ((byte) (((x) >> VOLREDUCE) + 128))
 140
 141 #ifdef CONVERT_TO_ULAW
 142 #  define CONV(x) lin8_ulaw[(int) CONVU8(x)]
 143 #else
 144 #  define CONV(x) CONVU8(x)
 145 #endif
 146
 147 #define HIGH_PASS(hp, sv) (((hp) * 15 + (sv)) >> 4)
 148 #define TAPESOUND(tsp)    ((*tsp) >> 4)
 149
 150 static void process_sound(void)
 151 {
 152   static int soundhp;
 153   int i;
 154   byte *sb;
 155   register int sv;
 156
 157   sb = sp_sound_buf;
 158   if(last_not_played) {
 159     soundhp = *sb;
 160     last_not_played = 0;
 161   }
 162
 163   if(!sp_playing_tape) {
 164     for(i = TMNUM; i; sb++,i--) {
 165       sv = *sb;
 166       soundhp = HIGH_PASS(soundhp, sv);
 167       *sb = CONV(sv - soundhp);
 168     }
 169   }
 170   else {
 171     signed char *tsp;
 172
 173     tsp = sp_tape_sound;
 174     for(i = TMNUM; i; sb++,tsp++,i--) {
 175       sv = *sb + TAPESOUND(tsp);
 176       soundhp = (soundhp * 15 + sv)>>4;
 177       *sb = CONV(sv - soundhp);
 178     }
 179   }
 180 }
 181
 182 void autoclose_sound(void)
 183 {
 184     /* do we have any reason to autoclose sound? */
 185 #if 0
 186   if(sound_on && sound_to_autoclose && sndstate >= SPS_CLOSED) {
 187     close_snd(1);
 188     sndstate = SPS_AUTOCLOSED;
 189   }
 190 #endif
 191 }
 192 void get_more(unsigned char** start, size_t* size)
 193 {
 194     doneplay = 1;
 195     rb->pcm_play_stop();
 196    (void)*start;
 197    (void)*size;
 198 }
 199
 200 /* sp_sound_buf is Unsigned 8 bit, Rate 8000 Hz, Mono */
 201
 202 void write_buf(void){
 203     int i,j;
 204
 205     /* still not sure what is the best way to do this */
 206 #if 0
 207     my_buf[i] = /*(sp_sound_buf[i]<<8)-0x8000*/sp_sound_buf[i]<<8;
 208
 209
 210     for (i = 0, j = 0; i<TMNUM; i++, j+=6)
 211         my_buf[j] = my_buf[j+1] = my_buf[j+2] = my_buf[j+3] = my_buf[j+4] = my_buf[j+5] = (((byte)sp_sound_buf[i])<<8) >> settings.volume;
 212 #endif
 213
 214
 215     for (i = 0, j = 0; i<TMNUM; i++, j+=12)
 216         my_buf[j] = my_buf[j+1] = my_buf[j+2] = my_buf[j+3]\
 217                     = my_buf[j+4] = my_buf[j+5] = my_buf[j+6]\
 218                     = my_buf[j+7] = my_buf[j+8] = my_buf[j+9] \
 219                     = my_buf[j+10] = my_buf[j+11] \
 220                     = (((byte)sp_sound_buf[i])<<8) >> settings.volume;
 221
 222     rb->pcm_play_data(&get_more,(unsigned char*)(my_buf),TMNUM*4*3*2);
 223
 224 #if 0
 225     /* can use to save and later analyze what we produce */
 226     i = rb->open ( "/sound.raw" , O_WRONLY | O_APPEND | O_CREAT, 0666);
 227     rb->write ( i  , sp_sound_buf , TMNUM );
 228     rb->close (i);
 229
 230
 231     i = rb->open ( "/sound2.raw" , O_WRONLY | O_APPEND |O_CREAT, 0666);
 232     rb->write ( i  , (unsigned char *)my_buf , TMNUM*4*3 );
 233     rb->close (i);
 234 #endif
 235
 236
 237     while(!doneplay)
 238         rb->yield();
 239
 240 }
 241 void play_sound(int evenframe)
 242 {
 243   if(evenframe) return;
 244   if(!sound_on) {
 245     if(sndstate <= SPS_CLOSED) return;
 246     if(sndstate < SPS_OPENED) {
 247       sndstate = SPS_CLOSED;
 248       return;
 249     }
 250     close_snd(1);
 251     return;
 252   }
 253
 254   z80_proc.sound_change = 0;
 255
 256   process_sound();
 257
 258   write_buf();
 259 }
 260
 261
 262 void setbufsize(void)
 263 {
 264
 265 }
 266
 267
 268 #else /* HAVE_SOUND */
 269
 270 /* Dummy functions */
 271
 272 void setbufsize(void)
 273 {
 274 }
 275
 276 void init_spect_sound(void)
 277 {
 278 }
 279
 280 void play_sound(int evenframe)
 281 {
 282   (void)evenframe;
 283 }
 284
 285 void autoclose_sound(void)
 286 {
 287 }
 288
 289 #endif /* NO_SOUND */
 290
 291