uisimulator/sdl/sound.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 by Nick Lanham
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "autoconf.h"
  23
  24 #include <stdlib.h>
  25 #include <stdbool.h>
  26 #include <memory.h>
  27 #include "debug.h"
  28 #include "kernel.h"
  29 #include "sound.h"
  30
  31 #include "pcm.h"
  32 #include "pcm_sampr.h"
  33 #include "SDL.h"
  34
  35 static int cvt_status = -1;
  36
  37 static Uint8* pcm_data;
  38 static size_t pcm_data_size;
  39 static size_t pcm_sample_bytes;
  40 static size_t pcm_channel_bytes;
  41
  42 struct pcm_udata
  43 {
  44     Uint8 *stream;
  45     Uint32 num_in;
  46     Uint32 num_out;
  47     FILE  *debug;
  48 } udata;
  49
  50 static SDL_AudioSpec obtained;
  51 static SDL_AudioCVT cvt;
  52
  53 extern bool debug_audio;
  54
  55 #ifndef MIN
  56 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
  57 #endif
  58
  59 void pcm_play_lock(void)
  60 {
  61     SDL_LockAudio();
  62 }
  63
  64 void pcm_play_unlock(void)
  65 {
  66     SDL_UnlockAudio();
  67 }
  68
  69 static void pcm_dma_apply_settings_nolock(void)
  70 {
  71     cvt_status = SDL_BuildAudioCVT(&cvt, AUDIO_S16SYS, 2, pcm_sampr,
  72                     obtained.format, obtained.channels, obtained.freq);
  73
  74     if (cvt_status < 0) {
  75         cvt.len_ratio = (double)obtained.freq / (double)pcm_sampr;
  76     }
  77 }
  78
  79 void pcm_dma_apply_settings(void)
  80 {
  81     pcm_play_lock();
  82     pcm_dma_apply_settings_nolock();
  83     pcm_play_unlock();
  84 }
  85
  86 void pcm_play_dma_start(const void *addr, size_t size)
  87 {
  88     pcm_dma_apply_settings_nolock();
  89
  90     pcm_data = (Uint8 *) addr;
  91     pcm_data_size = size;
  92
  93     SDL_PauseAudio(0);
  94 }
  95
  96 void pcm_play_dma_stop(void)
  97 {
  98     SDL_PauseAudio(1);
  99 }
 100
 101 void pcm_play_dma_pause(bool pause)
 102 {
 103     if (pause)
 104         SDL_PauseAudio(1);
 105     else
 106         SDL_PauseAudio(0);
 107 }
 108
 109 size_t pcm_get_bytes_waiting(void)
 110 {
 111     return pcm_data_size;
 112 }
 113
 114 extern int sim_volume; /* in firmware/sound.c */
 115 void write_to_soundcard(struct pcm_udata *udata) {
 116     if (cvt.needed) {
 117         Uint32 rd = udata->num_in;
 118         Uint32 wr = (double)rd * cvt.len_ratio;
 119
 120         if (wr > udata->num_out) {
 121             wr = udata->num_out;
 122             rd = (double)wr / cvt.len_ratio;
 123
 124             if (rd > udata->num_in)
 125             {
 126                 rd = udata->num_in;
 127                 wr = (double)rd * cvt.len_ratio;
 128             }
 129         }
 130
 131         if (wr == 0 || rd == 0)
 132         {
 133             udata->num_out = udata->num_in = 0;
 134             return;
 135         }
 136
 137         if (cvt_status > 0) {
 138             cvt.len = rd * pcm_sample_bytes;
 139             cvt.buf = (Uint8 *) malloc(cvt.len * cvt.len_mult);
 140
 141             memcpy(cvt.buf, pcm_data, cvt.len);
 142
 143             SDL_ConvertAudio(&cvt);
 144             SDL_MixAudio(udata->stream, cvt.buf, cvt.len_cvt, sim_volume);
 145
 146             udata->num_in = cvt.len / pcm_sample_bytes;
 147             udata->num_out = cvt.len_cvt / pcm_sample_bytes;
 148
 149             if (udata->debug != NULL) {
 150                fwrite(cvt.buf, sizeof(Uint8), cvt.len_cvt, udata->debug);
 151             }
 152
 153             free(cvt.buf);
 154         }
 155         else {
 156             /* Convert is bad, so do silence */
 157             Uint32 num = wr*obtained.channels;
 158             udata->num_in = rd;
 159             udata->num_out = wr;
 160
 161             switch (pcm_channel_bytes)
 162             {
 163             case 1:
 164             {
 165                 Uint8 *stream = udata->stream;
 166                 while (num-- > 0)
 167                     *stream++ = obtained.silence;
 168                 break;
 169                 }
 170             case 2:
 171             {
 172                 Uint16 *stream = (Uint16 *)udata->stream;
 173                 while (num-- > 0)
 174                     *stream++ = obtained.silence;
 175                 break;
 176                 }
 177             }
 178
 179             if (udata->debug != NULL) {
 180                fwrite(udata->stream, sizeof(Uint8), wr, udata->debug);
 181             }
 182         }
 183     } else {
 184         udata->num_in = udata->num_out = MIN(udata->num_in, udata->num_out);
 185         SDL_MixAudio(udata->stream, pcm_data,
 186                      udata->num_out * pcm_sample_bytes, sim_volume);
 187
 188         if (udata->debug != NULL) {
 189            fwrite(pcm_data, sizeof(Uint8), udata->num_out * pcm_sample_bytes,
 190                   udata->debug);
 191         }
 192     }
 193 }
 194
 195 void sdl_audio_callback(struct pcm_udata *udata, Uint8 *stream, int len)
 196 {
 197     udata->stream = stream;
 198
 199     /* Write what we have in the PCM buffer */
 200     if (pcm_data_size > 0)
 201         goto start;
 202
 203     /* Audio card wants more? Get some more then. */
 204     while (len > 0) {
 205         if ((ssize_t)pcm_data_size <= 0) {
 206             pcm_data_size = 0;
 207
 208             if (pcm_callback_for_more)
 209                 pcm_callback_for_more(&pcm_data, &pcm_data_size);
 210         }
 211
 212         if (pcm_data_size > 0) {
 213     start:
 214             udata->num_in  = pcm_data_size / pcm_sample_bytes;
 215             udata->num_out = len / pcm_sample_bytes;
 216
 217             write_to_soundcard(udata);
 218
 219             udata->num_in  *= pcm_sample_bytes;
 220             udata->num_out *= pcm_sample_bytes;
 221
 222             pcm_data      += udata->num_in;
 223             pcm_data_size -= udata->num_in;
 224             udata->stream += udata->num_out;
 225             len           -= udata->num_out;
 226         } else {
 227             DEBUGF("sdl_audio_callback: No Data.\n");
 228             pcm_play_dma_stop();
 229             pcm_play_dma_stopped_callback();
 230             break;
 231         }
 232     }
 233 }
 234
 235 const void * pcm_play_dma_get_peak_buffer(int *count)
 236 {
 237     uintptr_t addr = (uintptr_t)pcm_data;
 238     *count = pcm_data_size / 4;
 239     return (void *)((addr + 2) & ~3);
 240 }
 241
 242 #ifdef HAVE_RECORDING
 243 void pcm_rec_lock(void)
 244 {
 245 }
 246
 247 void pcm_rec_unlock(void)
 248 {
 249 }
 250
 251 void pcm_rec_dma_init(void)
 252 {
 253 }
 254
 255 void pcm_rec_dma_close(void)
 256 {
 257 }
 258
 259 void pcm_rec_dma_start(void *start, size_t size)
 260 {
 261     (void)start;
 262     (void)size;
 263 }
 264
 265 void pcm_rec_dma_stop(void)
 266 {
 267 }
 268
 269 void pcm_record_more(void *start, size_t size)
 270 {
 271     (void)start;
 272     (void)size;
 273 }
 274
 275 unsigned long pcm_rec_status(void)
 276 {
 277     return 0;
 278 }
 279
 280 const void * pcm_rec_dma_get_peak_buffer(int *count)
 281 {
 282     *count = 0;
 283     return NULL;
 284 }
 285
 286 #endif /* HAVE_RECORDING */
 287
 288 void pcm_play_dma_init(void)
 289 {
 290     SDL_AudioSpec wanted_spec;
 291     udata.debug = NULL;
 292
 293     if (debug_audio) {
 294         udata.debug = fopen("audiodebug.raw", "wb");
 295     }
 296
 297     /* Set 16-bit stereo audio at 44Khz */
 298     wanted_spec.freq = 44100;
 299     wanted_spec.format = AUDIO_S16SYS;
 300     wanted_spec.channels = 2;
 301     wanted_spec.samples = 2048;
 302     wanted_spec.callback =
 303         (void (SDLCALL *)(void *userdata,
 304             Uint8 *stream, int len))sdl_audio_callback;
 305     wanted_spec.userdata = &udata;
 306
 307     /* Open the audio device and start playing sound! */
 308     if(SDL_OpenAudio(&wanted_spec, &obtained) < 0) {
 309         fprintf(stderr, "Unable to open audio: %s\n", SDL_GetError());
 310         return;
 311     }
 312
 313     switch (obtained.format)
 314     {
 315     case AUDIO_U8:
 316     case AUDIO_S8:
 317         pcm_channel_bytes = 1;
 318         break;
 319     case AUDIO_U16LSB:
 320     case AUDIO_S16LSB:
 321     case AUDIO_U16MSB:
 322     case AUDIO_S16MSB:
 323         pcm_channel_bytes = 2;
 324         break;
 325     default:
 326         fprintf(stderr, "Unknown sample format obtained: %u\n",
 327                 (unsigned)obtained.format);
 328         return;
 329     }
 330
 331     pcm_sample_bytes = obtained.channels * pcm_channel_bytes;
 332
 333     pcm_dma_apply_settings_nolock();
 334 }
 335
 336 void pcm_postinit(void)
 337 {
 338 }