firmware/pcm_playback.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 by Linus Nielsen Feltzing
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #include "system.h"
  20 #include "kernel.h"
  21 #include "logf.h"
  22 #include "audio.h"
  23 #include "sound.h"
  24 #if CONFIG_CPU == PNX0101
  25 #include "string.h"
  26 #endif
  27
  28 /**
  29  * APIs implemented in the target-specific portion:
  30  * Public -
  31  *      pcm_init
  32  *      pcm_get_bytes_waiting
  33  *      pcm_calculate_peaks
  34  * Semi-private -
  35  *      pcm_play_dma_start
  36  *      pcm_play_dma_stop
  37  *      pcm_play_pause_pause
  38  *      pcm_play_pause_unpause
  39  */
  40
  41 /** These items may be implemented target specifically or need to
  42     be shared semi-privately **/
  43
  44 /* the registered callback function to ask for more mp3 data */
  45 volatile pcm_more_callback_type pcm_callback_for_more = NULL;
  46 volatile bool                   pcm_playing           = false;
  47 volatile bool                   pcm_paused            = false;
  48
  49 void pcm_play_dma_start(const void *addr, size_t size);
  50 void pcm_play_dma_stop(void);
  51 void pcm_play_pause_pause(void);
  52 void pcm_play_pause_unpause(void);
  53
  54 /** Functions that require targeted implementation **/
  55
  56 #if !defined(CPU_COLDFIRE) && (CONFIG_CPU != S3C2440)
  57
  58 #if (CONFIG_CPU == PNX0101)
  59
  60 #define DMA_BUF_SAMPLES 0x100
  61
  62 short __attribute__((section(".dmabuf"))) dma_buf_left[DMA_BUF_SAMPLES];
  63 short __attribute__((section(".dmabuf"))) dma_buf_right[DMA_BUF_SAMPLES];
  64
  65 static int pcm_freq = HW_SAMPR_DEFAULT; /* 44.1 is default */
  66
  67 unsigned short* p IBSS_ATTR;
  68 size_t p_size IBSS_ATTR;
  69
  70 void pcm_play_dma_start(const void *addr, size_t size)
  71 {
  72     p = (unsigned short*)addr;
  73     p_size = size;
  74
  75     pcm_playing = true;
  76 }
  77
  78 void pcm_play_dma_stop(void)
  79 {
  80     pcm_playing = false;
  81 }
  82
  83 void pcm_play_pause_pause(void)
  84 {
  85 }
  86
  87 void pcm_play_pause_unpause(void)
  88 {
  89 }
  90
  91 static inline void fill_dma_buf(int offset)
  92 {
  93     short *l, *r, *lend;
  94
  95     l = dma_buf_left + offset;
  96     lend = l + DMA_BUF_SAMPLES / 2;
  97     r = dma_buf_right + offset;
  98
  99     if (pcm_playing && !pcm_paused)
 100     {
 101         do
 102         {
 103             int count;
 104             unsigned short *tmp_p;
 105             count = MIN(p_size / 4, (size_t)(lend - l));
 106             tmp_p = p;
 107             p_size -= count * 4;
 108
 109             if ((int)l & 3)
 110             {
 111                 *l++ = *tmp_p++;
 112                 *r++ = *tmp_p++;
 113                 count--;
 114             }
 115             while (count >= 4)
 116             {
 117                 asm("ldmia %0!, {r0, r1, r2, r3}\n\t"
 118                     "and   r4, r0, %3\n\t"
 119                     "orr   r4, r4, r1, lsl #16\n\t"
 120                     "and   r5, r2, %3\n\t"
 121                     "orr   r5, r5, r3, lsl #16\n\t"
 122                     "stmia %1!, {r4, r5}\n\t"
 123                     "bic   r4, r1, %3\n\t"
 124                     "orr   r4, r4, r0, lsr #16\n\t"
 125                     "bic   r5, r3, %3\n\t"
 126                     "orr   r5, r5, r2, lsr #16\n\t"
 127                     "stmia %2!, {r4, r5}"
 128                     : "+r" (tmp_p), "+r" (l), "+r" (r)
 129                     : "r" (0xffff)
 130                     : "r0", "r1", "r2", "r3", "r4", "r5", "memory");
 131                 count -= 4;
 132             }
 133             while (count > 0)
 134             {
 135                 *l++ = *tmp_p++;
 136                 *r++ = *tmp_p++;
 137                 count--;
 138             }
 139             p = tmp_p;
 140             if (l >= lend)
 141                 return;
 142             else if (pcm_callback_for_more)
 143                 pcm_callback_for_more((unsigned char**)&p,
 144                                   &p_size);
 145         }
 146         while (p_size);
 147         pcm_playing = false;
 148     }
 149
 150     if (l < lend)
 151     {
 152         memset(l, 0, sizeof(short) * (lend - l));
 153         memset(r, 0, sizeof(short) * (lend - l));
 154     }
 155 }
 156
 157 static void audio_irq(void)
 158 {
 159     unsigned long st = DMAINTSTAT & ~DMAINTEN;
 160     int i;
 161     for (i = 0; i < 2; i++)
 162         if (st & (1 << i))
 163         {
 164             fill_dma_buf((i == 1) ? 0 : DMA_BUF_SAMPLES / 2);
 165             DMAINTSTAT = 1 << i;
 166         }
 167 }
 168
 169 unsigned long physical_address(void *p)
 170 {
 171     unsigned long adr = (unsigned long)p;
 172     return (MMUBLOCK((adr >> 21) & 0xf) << 21) | (adr & ((1 << 21) - 1));
 173 }
 174
 175 void pcm_init(void)
 176 {
 177     int i;
 178
 179     pcm_playing = false;
 180     pcm_paused = false;
 181     pcm_callback_for_more = NULL;
 182
 183     memset(dma_buf_left, 0, sizeof(dma_buf_left));
 184     memset(dma_buf_right, 0, sizeof(dma_buf_right));
 185
 186     for (i = 0; i < 8; i++)
 187     {
 188         DMASRC(i) = 0;
 189         DMADEST(i) = 0;
 190         DMALEN(i) = 0x1ffff;
 191         DMAR0C(i) = 0;
 192         DMAR10(i) = 0;
 193         DMAR1C(i) = 0;
 194     }
 195
 196     DMAINTSTAT = 0xc000ffff;
 197     DMAINTEN = 0xc000ffff;
 198
 199     DMASRC(0) = physical_address(dma_buf_left);
 200     DMADEST(0) = 0x80200280;
 201     DMALEN(0) = 0xff;
 202     DMAR1C(0) = 0;
 203     DMAR0C(0) = 0x40408;
 204
 205     DMASRC(1) = physical_address(dma_buf_right);
 206     DMADEST(1) = 0x80200284;
 207     DMALEN(1) = 0xff;
 208     DMAR1C(1) = 0;
 209     DMAR0C(1) = 0x40409;
 210
 211     irq_set_int_handler(0x1b, audio_irq);
 212     irq_enable_int(0x1b);
 213
 214     DMAINTSTAT = 1;
 215     DMAINTSTAT = 2;
 216     DMAINTEN &= ~3;
 217     DMAR10(0) |= 1;
 218     DMAR10(1) |= 1;
 219 }
 220
 221 void pcm_postinit(void)
 222 {
 223     audiohw_postinit();
 224 }
 225
 226 void pcm_set_frequency(unsigned int frequency)
 227 {
 228     (void)frequency;
 229     pcm_freq = HW_SAMPR_DEFAULT;
 230 }
 231 size_t pcm_get_bytes_waiting(void)
 232 {
 233     return p_size;
 234 }
 235 #endif /* CONFIG_CPU == */
 236
 237 /* dummy functions for those not actually supporting all this yet */
 238 void pcm_apply_settings(void)
 239 {
 240 }
 241 /** **/
 242
 243 void pcm_mute(bool mute)
 244 {
 245 #if defined(HAVE_WM8975) || defined(HAVE_WM8758) \
 246    || defined(HAVE_WM8731) || defined(HAVE_WM8721)
 247     audiohw_mute(mute);
 248 #endif
 249     if (mute)
 250         sleep(HZ/16);
 251 }
 252 #if !defined(CPU_PP)
 253 /*
 254  * This function goes directly into the DMA buffer to calculate the left and
 255  * right peak values. To avoid missing peaks it tries to look forward two full
 256  * peek periods (2/HZ sec, 100% overlap), although it's always possible that
 257  * the entire period will not be visible. To reduce CPU load it only looks at
 258  * every third sample, and this can be reduced even further if needed (even
 259  * every tenth sample would still be pretty accurate).
 260  */
 261
 262 /* Check for a peak every PEAK_STRIDE samples */
 263 #define PEAK_STRIDE   3
 264 /* Up to 1/50th of a second of audio for peak calculation */
 265 /* This should use NATIVE_FREQUENCY, or eventually an adjustable freq. value */
 266 #define PEAK_SAMPLES  (44100/50)
 267 void pcm_calculate_peaks(int *left, int *right)
 268 {
 269 #if (CONFIG_CPU == S3C2440)
 270     (void)left;
 271     (void)right;
 272 #else
 273     short *addr;
 274     short *end;
 275     {
 276 #if CONFIG_CPU == PNX0101
 277         size_t samples = p_size / 4;
 278         addr = p;
 279 #endif
 280
 281         if (samples > PEAK_SAMPLES)
 282             samples = PEAK_SAMPLES - (PEAK_STRIDE - 1);
 283         else
 284             samples -= MIN(PEAK_STRIDE - 1, samples);
 285
 286         end = &addr[samples * 2];
 287     }
 288
 289     if (left && right) {
 290         int left_peak = 0, right_peak = 0;
 291
 292         while (addr < end) {
 293             int value;
 294             if ((value = addr [0]) > left_peak)
 295                 left_peak = value;
 296             else if (-value > left_peak)
 297                 left_peak = -value;
 298
 299             if ((value = addr [PEAK_STRIDE | 1]) > right_peak)
 300                 right_peak = value;
 301             else if (-value > right_peak)
 302                 right_peak = -value;
 303
 304             addr = &addr[PEAK_STRIDE * 2];
 305         }
 306
 307         *left = left_peak;
 308         *right = right_peak;
 309     }
 310     else if (left || right) {
 311         int peak_value = 0, value;
 312
 313         if (right)
 314             addr += (PEAK_STRIDE | 1);
 315
 316         while (addr < end) {
 317             if ((value = addr [0]) > peak_value)
 318                 peak_value = value;
 319             else if (-value > peak_value)
 320                 peak_value = -value;
 321
 322             addr += PEAK_STRIDE * 2;
 323         }
 324
 325         if (left)
 326             *left = peak_value;
 327         else
 328             *right = peak_value;
 329     }
 330 #endif
 331 }
 332 #endif
 333 #endif /* CPU_COLDFIRE */
 334
 335 /****************************************************************************
 336  * Functions that do not require targeted implementation but only a targeted
 337  * interface
 338  */
 339
 340 /* Common code to pcm_play_data and pcm_play_pause
 341    Returns true if DMA playback was started, else false. */
 342 bool pcm_play_data_start(pcm_more_callback_type get_more,
 343                          unsigned char *start, size_t size)
 344 {
 345     if (!(start && size))
 346     {
 347         size = 0;
 348         if (get_more)
 349             get_more(&start, &size);
 350     }
 351
 352     if (start && size)
 353     {
 354         pcm_play_dma_start(start, size);
 355         return true;
 356     }
 357
 358     return false;
 359 }
 360
 361 void pcm_play_data(pcm_more_callback_type get_more,
 362                    unsigned char *start, size_t size)
 363 {
 364     pcm_callback_for_more = get_more;
 365
 366     if (pcm_play_data_start(get_more, start, size) && pcm_paused)
 367     {
 368         pcm_paused = false;
 369         pcm_play_pause(false);
 370     }
 371 }
 372
 373 void pcm_play_pause(bool play)
 374 {
 375     bool needs_change = pcm_paused == play;
 376
 377     /* This needs to be done ahead of the rest to prevent infinite
 378        recursion from pcm_play_data */
 379     pcm_paused = !play;
 380
 381     if (pcm_playing && needs_change)
 382     {
 383         if (play)
 384         {
 385             if (pcm_get_bytes_waiting())
 386             {
 387                 logf("unpause");
 388                 pcm_play_pause_unpause();
 389             }
 390             else
 391             {
 392                 logf("unpause, no data waiting");
 393                 if (!pcm_play_data_start(pcm_callback_for_more, NULL, 0))
 394                 {
 395                     pcm_play_dma_stop();
 396                     logf("unpause attempted, no data");
 397                 }
 398             }
 399         }
 400         else
 401         {
 402             logf("pause");
 403             pcm_play_pause_pause();
 404         }
 405     } /* pcm_playing && needs_change */
 406 }
 407
 408 void pcm_play_stop(void)
 409 {
 410     if (pcm_playing)
 411         pcm_play_dma_stop();
 412 }
 413
 414 bool pcm_is_playing(void)
 415 {
 416     return pcm_playing;
 417 }
 418
 419 bool pcm_is_paused(void)
 420 {
 421     return pcm_paused;
 422 }