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     pcm_paused = false;
  82 }
  83
  84 void pcm_play_pause_pause(void)
  85 {
  86 }
  87
  88 void pcm_play_pause_unpause(void)
  89 {
  90 }
  91
  92 static inline void fill_dma_buf(int offset)
  93 {
  94     short *l, *r, *lend;
  95
  96     l = dma_buf_left + offset;
  97     lend = l + DMA_BUF_SAMPLES / 2;
  98     r = dma_buf_right + offset;
  99
 100     if (pcm_playing && !pcm_paused)
 101     {
 102         do
 103         {
 104             int count;
 105             unsigned short *tmp_p;
 106             count = MIN(p_size / 4, (size_t)(lend - l));
 107             tmp_p = p;
 108             p_size -= count * 4;
 109
 110             if ((int)l & 3)
 111             {
 112                 *l++ = *tmp_p++;
 113                 *r++ = *tmp_p++;
 114                 count--;
 115             }
 116             while (count >= 4)
 117             {
 118                 asm("ldmia %0!, {r0, r1, r2, r3}\n\t"
 119                     "and   r4, r0, %3\n\t"
 120                     "orr   r4, r4, r1, lsl #16\n\t"
 121                     "and   r5, r2, %3\n\t"
 122                     "orr   r5, r5, r3, lsl #16\n\t"
 123                     "stmia %1!, {r4, r5}\n\t"
 124                     "bic   r4, r1, %3\n\t"
 125                     "orr   r4, r4, r0, lsr #16\n\t"
 126                     "bic   r5, r3, %3\n\t"
 127                     "orr   r5, r5, r2, lsr #16\n\t"
 128                     "stmia %2!, {r4, r5}"
 129                     : "+r" (tmp_p), "+r" (l), "+r" (r)
 130                     : "r" (0xffff)
 131                     : "r0", "r1", "r2", "r3", "r4", "r5", "memory");
 132                 count -= 4;
 133             }
 134             while (count > 0)
 135             {
 136                 *l++ = *tmp_p++;
 137                 *r++ = *tmp_p++;
 138                 count--;
 139             }
 140             p = tmp_p;
 141             if (l >= lend)
 142                 return;
 143             else if (pcm_callback_for_more)
 144                 pcm_callback_for_more((unsigned char**)&p,
 145                                   &p_size);
 146         }
 147         while (p_size);
 148         pcm_playing = false;
 149     }
 150
 151     if (l < lend)
 152     {
 153         memset(l, 0, sizeof(short) * (lend - l));
 154         memset(r, 0, sizeof(short) * (lend - l));
 155     }
 156 }
 157
 158 static void audio_irq(void)
 159 {
 160     unsigned long st = DMAINTSTAT & ~DMAINTEN;
 161     int i;
 162     for (i = 0; i < 2; i++)
 163         if (st & (1 << i))
 164         {
 165             fill_dma_buf((i == 1) ? 0 : DMA_BUF_SAMPLES / 2);
 166             DMAINTSTAT = 1 << i;
 167         }
 168 }
 169
 170 unsigned long physical_address(void *p)
 171 {
 172     unsigned long adr = (unsigned long)p;
 173     return (MMUBLOCK((adr >> 21) & 0xf) << 21) | (adr & ((1 << 21) - 1));
 174 }
 175
 176 void pcm_init(void)
 177 {
 178     int i;
 179
 180     pcm_playing = false;
 181     pcm_paused = false;
 182     pcm_callback_for_more = NULL;
 183
 184     memset(dma_buf_left, 0, sizeof(dma_buf_left));
 185     memset(dma_buf_right, 0, sizeof(dma_buf_right));
 186
 187     for (i = 0; i < 8; i++)
 188     {
 189         DMASRC(i) = 0;
 190         DMADEST(i) = 0;
 191         DMALEN(i) = 0x1ffff;
 192         DMAR0C(i) = 0;
 193         DMAR10(i) = 0;
 194         DMAR1C(i) = 0;
 195     }
 196
 197     DMAINTSTAT = 0xc000ffff;
 198     DMAINTEN = 0xc000ffff;
 199
 200     DMASRC(0) = physical_address(dma_buf_left);
 201     DMADEST(0) = 0x80200280;
 202     DMALEN(0) = 0xff;
 203     DMAR1C(0) = 0;
 204     DMAR0C(0) = 0x40408;
 205
 206     DMASRC(1) = physical_address(dma_buf_right);
 207     DMADEST(1) = 0x80200284;
 208     DMALEN(1) = 0xff;
 209     DMAR1C(1) = 0;
 210     DMAR0C(1) = 0x40409;
 211
 212     irq_set_int_handler(0x1b, audio_irq);
 213     irq_enable_int(0x1b);
 214
 215     DMAINTSTAT = 1;
 216     DMAINTSTAT = 2;
 217     DMAINTEN &= ~3;
 218     DMAR10(0) |= 1;
 219     DMAR10(1) |= 1;
 220 }
 221
 222 void pcm_postinit(void)
 223 {
 224     audiohw_postinit();
 225 }
 226
 227 void pcm_set_frequency(unsigned int frequency)
 228 {
 229     (void)frequency;
 230     pcm_freq = HW_SAMPR_DEFAULT;
 231 }
 232 size_t pcm_get_bytes_waiting(void)
 233 {
 234     return p_size;
 235 }
 236 #endif /* CONFIG_CPU == */
 237
 238 /* dummy functions for those not actually supporting all this yet */
 239 void pcm_apply_settings(void)
 240 {
 241 }
 242 /** **/
 243
 244 void pcm_mute(bool mute)
 245 {
 246 #if defined(HAVE_WM8975) || defined(HAVE_WM8758) \
 247    || defined(HAVE_WM8731) || defined(HAVE_WM8721)
 248     audiohw_mute(mute);
 249 #endif
 250     if (mute)
 251         sleep(HZ/16);
 252 }
 253 #if !defined(CPU_PP)
 254 /*
 255  * This function goes directly into the DMA buffer to calculate the left and
 256  * right peak values. To avoid missing peaks it tries to look forward two full
 257  * peek periods (2/HZ sec, 100% overlap), although it's always possible that
 258  * the entire period will not be visible. To reduce CPU load it only looks at
 259  * every third sample, and this can be reduced even further if needed (even
 260  * every tenth sample would still be pretty accurate).
 261  */
 262
 263 /* Check for a peak every PEAK_STRIDE samples */
 264 #define PEAK_STRIDE   3
 265 /* Up to 1/50th of a second of audio for peak calculation */
 266 /* This should use NATIVE_FREQUENCY, or eventually an adjustable freq. value */
 267 #define PEAK_SAMPLES  (44100/50)
 268 void pcm_calculate_peaks(int *left, int *right)
 269 {
 270 #if (CONFIG_CPU == S3C2440)
 271     (void)left;
 272     (void)right;
 273 #else
 274     short *addr;
 275     short *end;
 276     {
 277 #if CONFIG_CPU == PNX0101
 278         size_t samples = p_size / 4;
 279         addr = p;
 280 #endif
 281
 282         if (samples > PEAK_SAMPLES)
 283             samples = PEAK_SAMPLES - (PEAK_STRIDE - 1);
 284         else
 285             samples -= MIN(PEAK_STRIDE - 1, samples);
 286
 287         end = &addr[samples * 2];
 288     }
 289
 290     if (left && right) {
 291         int left_peak = 0, right_peak = 0;
 292
 293         while (addr < end) {
 294             int value;
 295             if ((value = addr [0]) > left_peak)
 296                 left_peak = value;
 297             else if (-value > left_peak)
 298                 left_peak = -value;
 299
 300             if ((value = addr [PEAK_STRIDE | 1]) > right_peak)
 301                 right_peak = value;
 302             else if (-value > right_peak)
 303                 right_peak = -value;
 304
 305             addr = &addr[PEAK_STRIDE * 2];
 306         }
 307
 308         *left = left_peak;
 309         *right = right_peak;
 310     }
 311     else if (left || right) {
 312         int peak_value = 0, value;
 313
 314         if (right)
 315             addr += (PEAK_STRIDE | 1);
 316
 317         while (addr < end) {
 318             if ((value = addr [0]) > peak_value)
 319                 peak_value = value;
 320             else if (-value > peak_value)
 321                 peak_value = -value;
 322
 323             addr += PEAK_STRIDE * 2;
 324         }
 325
 326         if (left)
 327             *left = peak_value;
 328         else
 329             *right = peak_value;
 330     }
 331 #endif
 332 }
 333 #endif
 334 #endif /* CPU_COLDFIRE */
 335
 336 /****************************************************************************
 337  * Functions that do not require targeted implementation but only a targeted
 338  * interface
 339  */
 340
 341 /* Common code to pcm_play_data and pcm_play_pause
 342    Returns true if DMA playback was started, else false. */
 343 bool pcm_play_data_start(pcm_more_callback_type get_more,
 344                          unsigned char *start, size_t size)
 345 {
 346     if (!(start && size))
 347     {
 348         size = 0;
 349         if (get_more)
 350             get_more(&start, &size);
 351     }
 352
 353     if (start && size)
 354     {
 355         pcm_play_dma_start(start, size);
 356         return true;
 357     }
 358
 359     return false;
 360 }
 361
 362 void pcm_play_data(pcm_more_callback_type get_more,
 363                    unsigned char *start, size_t size)
 364 {
 365     pcm_callback_for_more = get_more;
 366
 367     if (pcm_play_data_start(get_more, start, size) && pcm_paused)
 368     {
 369         pcm_paused = false;
 370         pcm_play_pause(false);
 371     }
 372 }
 373
 374 void pcm_play_pause(bool play)
 375 {
 376     bool needs_change = pcm_paused == play;
 377
 378     /* This needs to be done ahead of the rest to prevent infinite
 379        recursion from pcm_play_data */
 380     pcm_paused = !play;
 381
 382     if (pcm_playing && needs_change)
 383     {
 384         if (play)
 385         {
 386             if (pcm_get_bytes_waiting())
 387             {
 388                 logf("unpause");
 389                 pcm_play_pause_unpause();
 390             }
 391             else
 392             {
 393                 logf("unpause, no data waiting");
 394                 if (!pcm_play_data_start(pcm_callback_for_more, NULL, 0))
 395                 {
 396                     pcm_play_dma_stop();
 397                     logf("unpause attempted, no data");
 398                 }
 399             }
 400         }
 401         else
 402         {
 403             logf("pause");
 404             pcm_play_pause_pause();
 405         }
 406     } /* pcm_playing && needs_change */
 407 }
 408
 409 void pcm_play_stop(void)
 410 {
 411     if (pcm_playing)
 412         pcm_play_dma_stop();
 413 }
 414
 415 bool pcm_is_playing(void)
 416 {
 417     return pcm_playing;
 418 }
 419
 420 bool pcm_is_paused(void)
 421 {
 422     return pcm_paused;
 423 }