firmware/target/hosted/sdl/pcm-sdl.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 by Nick Lanham
  11  * Copyright (C) 2010 by Thomas Martitz
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22
  23 #include "autoconf.h"
  24
  25 #include <stdlib.h>
  26 #include <stdbool.h>
  27 #include <SDL.h>
  28 #include "config.h"
  29 #include "debug.h"
  30 #include "sound.h"
  31 #include "audiohw.h"
  32 #include "system.h"
  33
  34 #include "pcm.h"
  35 #include "pcm_sampr.h"
  36
  37 #ifdef DEBUG
  38 #include <stdio.h>
  39 extern bool debug_audio;
  40 #endif
  41
  42 static int sim_volume = 0;
  43
  44 #if CONFIG_CODEC == SWCODEC
  45 static int cvt_status = -1;
  46
  47 static Uint8* pcm_data;
  48 static size_t pcm_data_size;
  49 static size_t pcm_sample_bytes;
  50 static size_t pcm_channel_bytes;
  51
  52 struct pcm_udata
  53 {
  54     Uint8 *stream;
  55     Uint32 num_in;
  56     Uint32 num_out;
  57 #ifdef DEBUG
  58     FILE  *debug;
  59 #endif
  60 } udata;
  61
  62 static SDL_AudioSpec obtained;
  63 static SDL_AudioCVT cvt;
  64
  65 void pcm_play_lock(void)
  66 {
  67     SDL_LockAudio();
  68 }
  69
  70 void pcm_play_unlock(void)
  71 {
  72     SDL_UnlockAudio();
  73 }
  74
  75 static void pcm_dma_apply_settings_nolock(void)
  76 {
  77     cvt_status = SDL_BuildAudioCVT(&cvt, AUDIO_S16SYS, 2, pcm_sampr,
  78                     obtained.format, obtained.channels, obtained.freq);
  79
  80     if (cvt_status < 0) {
  81         cvt.len_ratio = (double)obtained.freq / (double)pcm_sampr;
  82     }
  83 }
  84
  85 void pcm_dma_apply_settings(void)
  86 {
  87     pcm_play_lock();
  88     pcm_dma_apply_settings_nolock();
  89     pcm_play_unlock();
  90 }
  91
  92 void pcm_play_dma_start(const void *addr, size_t size)
  93 {
  94     pcm_dma_apply_settings_nolock();
  95
  96     pcm_data = (Uint8 *) addr;
  97     pcm_data_size = size;
  98
  99     SDL_PauseAudio(0);
 100 }
 101
 102 void pcm_play_dma_stop(void)
 103 {
 104     SDL_PauseAudio(1);
 105 #ifdef DEBUG
 106     if (udata.debug != NULL) {
 107         fclose(udata.debug);
 108         udata.debug = NULL;
 109         DEBUGF("Audio debug file closed\n");
 110     }
 111 #endif
 112 }
 113
 114 void pcm_play_dma_pause(bool pause)
 115 {
 116     if (pause)
 117         SDL_PauseAudio(1);
 118     else
 119         SDL_PauseAudio(0);
 120 }
 121
 122 size_t pcm_get_bytes_waiting(void)
 123 {
 124     return pcm_data_size;
 125 }
 126
 127 void write_to_soundcard(struct pcm_udata *udata)
 128 {
 129 #ifdef DEBUG
 130     if (debug_audio && (udata->debug == NULL)) {
 131         udata->debug = fopen("audiodebug.raw", "ab");
 132         DEBUGF("Audio debug file open\n");
 133     }
 134 #endif
 135     if (cvt.needed) {
 136         Uint32 rd = udata->num_in;
 137         Uint32 wr = (double)rd * cvt.len_ratio;
 138
 139         if (wr > udata->num_out) {
 140             wr = udata->num_out;
 141             rd = (double)wr / cvt.len_ratio;
 142
 143             if (rd > udata->num_in)
 144             {
 145                 rd = udata->num_in;
 146                 wr = (double)rd * cvt.len_ratio;
 147             }
 148         }
 149
 150         if (wr == 0 || rd == 0)
 151         {
 152             udata->num_out = udata->num_in = 0;
 153             return;
 154         }
 155
 156         if (cvt_status > 0) {
 157             cvt.len = rd * pcm_sample_bytes;
 158             cvt.buf = (Uint8 *) malloc(cvt.len * cvt.len_mult);
 159
 160             memcpy(cvt.buf, pcm_data, cvt.len);
 161
 162             SDL_ConvertAudio(&cvt);
 163             SDL_MixAudio(udata->stream, cvt.buf, cvt.len_cvt, sim_volume);
 164
 165             udata->num_in = cvt.len / pcm_sample_bytes;
 166             udata->num_out = cvt.len_cvt / pcm_sample_bytes;
 167
 168 #ifdef DEBUG
 169             if (udata->debug != NULL) {
 170                fwrite(cvt.buf, sizeof(Uint8), cvt.len_cvt, udata->debug);
 171             }
 172 #endif
 173             free(cvt.buf);
 174         }
 175         else {
 176             /* Convert is bad, so do silence */
 177             Uint32 num = wr*obtained.channels;
 178             udata->num_in = rd;
 179             udata->num_out = wr;
 180
 181             switch (pcm_channel_bytes)
 182             {
 183             case 1:
 184             {
 185                 Uint8 *stream = udata->stream;
 186                 while (num-- > 0)
 187                     *stream++ = obtained.silence;
 188                 break;
 189                 }
 190             case 2:
 191             {
 192                 Uint16 *stream = (Uint16 *)udata->stream;
 193                 while (num-- > 0)
 194                     *stream++ = obtained.silence;
 195                 break;
 196                 }
 197             }
 198 #ifdef DEBUG
 199             if (udata->debug != NULL) {
 200                fwrite(udata->stream, sizeof(Uint8), wr, udata->debug);
 201             }
 202 #endif
 203         }
 204     } else {
 205         udata->num_in = udata->num_out = MIN(udata->num_in, udata->num_out);
 206         SDL_MixAudio(udata->stream, pcm_data,
 207                      udata->num_out * pcm_sample_bytes, sim_volume);
 208 #ifdef DEBUG
 209         if (udata->debug != NULL) {
 210            fwrite(pcm_data, sizeof(Uint8), udata->num_out * pcm_sample_bytes,
 211                   udata->debug);
 212         }
 213 #endif
 214     }
 215 }
 216
 217 void sdl_audio_callback(struct pcm_udata *udata, Uint8 *stream, int len)
 218 {
 219     udata->stream = stream;
 220
 221     /* Write what we have in the PCM buffer */
 222     if (pcm_data_size > 0)
 223         goto start;
 224
 225     /* Audio card wants more? Get some more then. */
 226     while (len > 0) {
 227         if ((ssize_t)pcm_data_size <= 0) {
 228             pcm_data_size = 0;
 229
 230             if (pcm_callback_for_more)
 231                 pcm_callback_for_more(&pcm_data, &pcm_data_size);
 232         }
 233
 234         if (pcm_data_size > 0) {
 235     start:
 236             udata->num_in  = pcm_data_size / pcm_sample_bytes;
 237             udata->num_out = len / pcm_sample_bytes;
 238
 239             write_to_soundcard(udata);
 240
 241             udata->num_in  *= pcm_sample_bytes;
 242             udata->num_out *= pcm_sample_bytes;
 243
 244             pcm_data      += udata->num_in;
 245             pcm_data_size -= udata->num_in;
 246             udata->stream += udata->num_out;
 247             len           -= udata->num_out;
 248         } else {
 249             DEBUGF("sdl_audio_callback: No Data.\n");
 250             pcm_play_dma_stop();
 251             pcm_play_dma_stopped_callback();
 252             break;
 253         }
 254     }
 255 }
 256
 257 const void * pcm_play_dma_get_peak_buffer(int *count)
 258 {
 259     uintptr_t addr = (uintptr_t)pcm_data;
 260     *count = pcm_data_size / 4;
 261     return (void *)((addr + 2) & ~3);
 262 }
 263
 264 #ifdef HAVE_RECORDING
 265 void pcm_rec_lock(void)
 266 {
 267 }
 268
 269 void pcm_rec_unlock(void)
 270 {
 271 }
 272
 273 void pcm_rec_dma_init(void)
 274 {
 275 }
 276
 277 void pcm_rec_dma_close(void)
 278 {
 279 }
 280
 281 void pcm_rec_dma_start(void *start, size_t size)
 282 {
 283     (void)start;
 284     (void)size;
 285 }
 286
 287 void pcm_rec_dma_stop(void)
 288 {
 289 }
 290
 291 void pcm_rec_dma_record_more(void *start, size_t size)
 292 {
 293     (void)start;
 294     (void)size;
 295 }
 296
 297 unsigned long pcm_rec_status(void)
 298 {
 299     return 0;
 300 }
 301
 302 const void * pcm_rec_dma_get_peak_buffer(void)
 303 {
 304     return NULL;
 305 }
 306
 307 #endif /* HAVE_RECORDING */
 308
 309 void pcm_play_dma_init(void)
 310 {
 311     if (SDL_InitSubSystem(SDL_INIT_AUDIO))
 312     {
 313         DEBUGF("Could not initialize SDL audio subsystem!\n");
 314         return;
 315     }
 316
 317     SDL_AudioSpec wanted_spec;
 318 #ifdef DEBUG
 319     udata.debug = NULL;
 320     if (debug_audio) {
 321         udata.debug = fopen("audiodebug.raw", "wb");
 322         DEBUGF("Audio debug file open\n");
 323     }
 324 #endif
 325     /* Set 16-bit stereo audio at 44Khz */
 326     wanted_spec.freq = 44100;
 327     wanted_spec.format = AUDIO_S16SYS;
 328     wanted_spec.channels = 2;
 329     wanted_spec.samples = 2048;
 330     wanted_spec.callback =
 331         (void (SDLCALL *)(void *userdata,
 332             Uint8 *stream, int len))sdl_audio_callback;
 333     wanted_spec.userdata = &udata;
 334
 335     /* Open the audio device and start playing sound! */
 336     if(SDL_OpenAudio(&wanted_spec, &obtained) < 0) {
 337         DEBUGF("Unable to open audio: %s\n", SDL_GetError());
 338         return;
 339     }
 340
 341     switch (obtained.format)
 342     {
 343     case AUDIO_U8:
 344     case AUDIO_S8:
 345         pcm_channel_bytes = 1;
 346         break;
 347     case AUDIO_U16LSB:
 348     case AUDIO_S16LSB:
 349     case AUDIO_U16MSB:
 350     case AUDIO_S16MSB:
 351         pcm_channel_bytes = 2;
 352         break;
 353     default:
 354         DEBUGF("Unknown sample format obtained: %u\n",
 355                 (unsigned)obtained.format);
 356         return;
 357     }
 358
 359     pcm_sample_bytes = obtained.channels * pcm_channel_bytes;
 360
 361     pcm_dma_apply_settings_nolock();
 362 }
 363
 364 void pcm_postinit(void)
 365 {
 366 }
 367
 368 void pcm_set_mixer_volume(int volume)
 369 {
 370     sim_volume = volume;
 371 }
 372
 373 #endif /* CONFIG_CODEC == SWCODEC */