summaryrefslogtreecommitdiffstats
path: root/firmware/pcm_record.c
blob: 04289f36ece58590ebbc2c75529ae602d291de6b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2005 by Linus Nielsen Feltzing
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "system.h"
#include "kernel.h"
#include "logf.h"
#include "panic.h"
#include "thread.h"
#include <string.h>
#include "ata.h"
#include "usb.h"
#if defined(HAVE_UDA1380)
#include "uda1380.h"
#include "general.h"
#elif defined(HAVE_TLV320)
#include "tlv320.h"
#endif
#include "buffer.h"
#include "audio.h"
#include "sound.h"
#include "id3.h"
#ifdef HAVE_SPDIF_IN
#include "spdif.h"
#endif

/***************************************************************************/

/**
 * APIs implemented in the target tree portion:
 * Public -
 *      pcm_init_recording
 *      pcm_close_recording
 *      pcm_rec_mux
 * Semi-private -
 *      pcm_rec_dma_start
 *      pcm_rec_dma_stop
 */

/** These items may be implemented target specifically or need to
    be shared semi-privately **/

/* the registered callback function for when more data is available */
pcm_more_callback_type pcm_callback_more_ready = NULL;
/* DMA transfer in is currently active */
bool                   pcm_recording           = false;

/* APIs implemented in the target-specific portion */
void pcm_rec_dma_start(const void *addr, size_t size);
void pcm_rec_dma_stop(void);

/** General recording state **/
static bool is_recording;              /* We are recording */
static bool is_paused;                 /* We have paused   */
static bool is_stopping;                 /* We are currently stopping      */
static bool is_error;                  /* An error has occured */

/** Stats on encoded data for current file **/
static size_t        num_rec_bytes;      /* Num bytes recorded             */
static unsigned long num_rec_samples;    /* Number of PCM samples recorded */

/** Stats on encoded data for all files from start to stop **/
static unsigned long long accum_rec_bytes; /* total size written to chunks */
static unsigned long long accum_pcm_samples; /* total pcm count processed  */

/* Keeps data about current file and is sent as event data for codec */
static struct enc_file_event_data rec_fdata IDATA_ATTR =
{
    .chunk           =  NULL,
    .new_enc_size    =  0,
    .new_num_pcm     =  0,
    .rec_file        = -1,
    .num_pcm_samples =  0
};

/** These apply to current settings **/
static int           rec_source;         /* current rec_source setting     */
static int           rec_frequency;      /* current frequency setting      */
static unsigned long sample_rate;        /* Sample rate in HZ              */
static int           num_channels;       /* Current number of channels     */
static struct encoder_config enc_config; /* Current encoder configuration  */
  
/****************************************************************************
  use 2 circular buffers:
  pcm_buffer=DMA output buffer:    chunks (8192 Bytes) of raw pcm audio data
  enc_buffer=encoded audio buffer: storage for encoder output data

  Flow:
  1. when entering recording_screen DMA feeds the ringbuffer pcm_buffer
  2. if enough pcm data are available the encoder codec does encoding of pcm
      chunks (4-8192 Bytes) into ringbuffer enc_buffer in codec_thread
  3. pcmrec_callback detects enc_buffer 'near full' and writes data to disk

  Functions calls (basic encoder steps):
  1.main:    audio_load_encoder();   start the encoder
  2.encoder: enc_get_inputs();       get encoder recording settings
  3.encoder: enc_set_parameters();   set the encoder parameters
  4.encoder: enc_get_pcm_data();     get n bytes of unprocessed pcm data
  5.encoder: enc_pcm_buf_near_empty(); if 1: reduce cpu_boost
  6.encoder: enc_alloc_chunk();      get a ptr to next enc chunk
  7.encoder: <process enc chunk>     compress and store data to enc chunk
  8.encoder: enc_free_chunk();       inform main about chunk process finished
  9.encoder: repeat 4. to 8.
  A.pcmrec:  enc_events_callback();   called for certain events
****************************************************************************/

/** buffer parameters where incoming PCM data is placed **/
#define PCM_NUM_CHUNKS            256 /* Power of 2 */
#define PCM_CHUNK_SIZE           8192 /* Power of 2 */
#define PCM_CHUNK_MASK          (PCM_NUM_CHUNKS*PCM_CHUNK_SIZE - 1)

#define GET_PCM_CHUNK(offset)   ((long *)(pcm_buffer + (offset)))
#define GET_ENC_CHUNK(index)    ENC_CHUNK_HDR(enc_buffer + enc_chunk_size*(index))

#define INC_ENC_INDEX(index) \
            { if (++index >= enc_num_chunks) index = 0; }
#define DEC_ENC_INDEX(index) \
            { if (--index < 0) index = enc_num_chunks - 1; }

static size_t         rec_buffer_size; /* size of available buffer         */
static unsigned char *pcm_buffer;      /* circular recording buffer        */
static unsigned char *enc_buffer;      /* circular encoding buffer         */
static volatile int   dma_wr_pos;      /* current DMA write pos            */
static int            pcm_rd_pos;      /* current PCM read pos             */
static volatile bool  dma_lock;        /* lock DMA write position          */
static unsigned long  pre_record_ticks;/* pre-record time in ticks         */
static int            enc_wr_index;    /* encoder chunk write index        */
static int            enc_rd_index;    /* encoder chunk read index         */
static int            enc_num_chunks;  /* number of chunks in ringbuffer     */
static size_t         enc_chunk_size;  /* maximum encoder chunk size       */
static size_t         enc_data_size;   /* maximum data size for encoder    */
static unsigned long  enc_sample_rate; /* sample rate used by encoder      */
static bool           wav_queue_empty; /* all wav chunks processed?          */
 
/** file flushing **/
static int            write_threshold; /* max chunk limit for data flush   */
static int            panic_threshold; /* boost thread prio when here      */
static int            spinup_time = -1;/* last ata_spinup_time             */

/** encoder events **/
static void (*enc_events_callback)(enum enc_events event, void *data);

/** Path queue for files to write **/
#define FNQ_MIN_NUM_PATHS 16           /* minimum number of paths to hold  */
static unsigned char *fn_queue;        /* pointer to first filename        */
static ssize_t        fnq_size;        /* capacity of queue in bytes       */
static int            fnq_rd_pos;      /* current read position            */
static int            fnq_wr_pos;      /* current write position           */

/***************************************************************************/

static struct event_queue  pcmrec_queue;
static long                pcmrec_stack[3*DEFAULT_STACK_SIZE/sizeof(long)];
static const char          pcmrec_thread_name[] = "pcmrec";

static void pcmrec_thread(void);

/* Event values which are also single-bit flags */
#define PCMREC_INIT         0x00000001  /* enable recording                */
#define PCMREC_CLOSE        0x00000002

#define PCMREC_START        0x00000004  /* start recording (when stopped)  */
#define PCMREC_STOP         0x00000008  /* stop the current recording      */
#define PCMREC_PAUSE        0x00000010  /* pause the current recording     */
#define PCMREC_RESUME       0x00000020  /* resume the current recording    */
#define PCMREC_NEW_FILE     0x00000040  /* start new file (when recording) */
#define PCMREC_SET_GAIN     0x00000080
#define PCMREC_FLUSH_NUM    0x00000100  /* flush a number of files out     */
#define PCMREC_FINISH_STOP  0x00000200  /* finish the stopping recording   */

/* mask for signaling events */
static volatile long pcm_thread_event_mask;

static void pcm_thread_sync_post(long event, void *data)
{
    pcm_thread_event_mask &= ~event;
    queue_post(&pcmrec_queue, event, data);
    while(!(event & pcm_thread_event_mask))
        yield();
} /* pcm_thread_sync_post */

static inline void pcm_thread_signal_event(long event)
{
    pcm_thread_event_mask |= event;
} /* pcm_thread_signal_event */

static inline void pcm_thread_unsignal_event(long event)
{
    pcm_thread_event_mask &= ~event;
} /* pcm_thread_unsignal_event */

static inline bool pcm_thread_event_state(long signaled, long unsignaled)
{
    return ((signaled | unsignaled) & pcm_thread_event_mask) == signaled;
} /* pcm_thread_event_state */
 
static void pcm_thread_wait_for_stop(void)
{
    if (is_stopping)
    {
        logf("waiting for stop to finish");
        while (is_stopping)
            yield();
    }
} /* pcm_thread_wait_for_stop */

/*******************************************************************/
/* Functions that are not executing in the pcmrec_thread first     */
/*******************************************************************/
    
/* Callback for when more data is ready */
static void pcm_rec_have_more(unsigned char **data, size_t *size)
{
    if (*size != 0)
    {
        /* some error condition */
        if (*size == DMA_REC_ERROR_DMA)
        {
            /* Flush recorded data to disk and stop recording */
            queue_post(&pcmrec_queue, PCMREC_STOP, NULL);
            return;
        }
        /* else try again next transmission */
    }
    else if (!dma_lock)
    {
        /* advance write position */
        dma_wr_pos = (dma_wr_pos + PCM_CHUNK_SIZE) & PCM_CHUNK_MASK;
    }
    
    *data = (unsigned char *)GET_PCM_CHUNK(dma_wr_pos);
    *size = PCM_CHUNK_SIZE;
} /* pcm_rec_have_more */

/** pcm_rec_* group **/
void pcm_rec_error_clear(void)
{
    is_error = false;
} /* pcm_rec_error_clear */

unsigned long pcm_rec_status(void)
{
    unsigned long ret = 0;

    if (is_recording)
        ret |= AUDIO_STATUS_RECORD;

    if (is_paused)
        ret |= AUDIO_STATUS_PAUSE;

    if (is_error)
        ret |= AUDIO_STATUS_ERROR;

    if (!is_recording && pre_record_ticks &&
        pcm_thread_event_state(PCMREC_INIT, PCMREC_CLOSE))
        ret |= AUDIO_STATUS_PRERECORD;

    return ret;
} /* pcm_rec_status */

int pcm_rec_current_bitrate(void)
{
    if (accum_pcm_samples == 0)
        return 0;

    return (int)(8*accum_rec_bytes*enc_sample_rate / (1000*accum_pcm_samples));
} /* pcm_rec_current_bitrate */

int pcm_rec_encoder_afmt(void)
{
    return enc_config.afmt;
} /* pcm_rec_encoder_afmt */

int pcm_rec_rec_format(void)
    {
    return afmt_rec_format[enc_config.afmt];
} /* pcm_rec_rec_format */

unsigned long pcm_rec_sample_rate(void)
{
    /* Which is better ?? */
#if 0
    return enc_sample_rate;
#endif
    return sample_rate;
} /* audio_get_sample_rate */

/**
 * Creates pcmrec_thread
 */
void pcm_rec_init(void)
{
    queue_init(&pcmrec_queue, true);
    create_thread(pcmrec_thread, pcmrec_stack, sizeof(pcmrec_stack),
                  pcmrec_thread_name, PRIORITY_RECORDING);
} /* pcm_rec_init */

/** audio_* group **/

void audio_init_recording(unsigned int buffer_offset)
{
    (void)buffer_offset;
    pcm_thread_wait_for_stop();
    pcm_thread_sync_post(PCMREC_INIT, NULL);
} /* audio_init_recording */

void audio_close_recording(void)
{
    pcm_thread_wait_for_stop();
    pcm_thread_sync_post(PCMREC_CLOSE, NULL);
    /* reset pcm to defaults (playback only) */
    pcm_set_frequency(-1);
    pcm_set_monitor(-1);
    pcm_set_rec_source(-1);
#ifdef HAVE_TLV320
    /* tlv320 screeches if left at 88.2 with no inputs */
    pcm_apply_settings(true);
#endif
    audio_remove_encoder();
} /* audio_close_recording */

unsigned long audio_recorded_time(void)
{
    if (!is_recording || enc_sample_rate == 0)
    return 0;

    /* return actual recorded time a la encoded data even if encoder rate
       doesn't match the pcm rate */
    return (long)(HZ*(unsigned long long)num_rec_samples / enc_sample_rate);
} /* audio_recorded_time */

unsigned long audio_num_recorded_bytes(void)
{
    if (!is_recording)
        return 0;

    return num_rec_bytes;
} /* audio_num_recorded_bytes */
    
#ifdef HAVE_SPDIF_IN
/**
 * Return SPDIF sample rate index in audio_master_sampr_list. Since we base
 * our reading on the actual SPDIF sample rate (which might be a bit
 * inaccurate), we round off to the closest sample rate that is supported by
 * SPDIF.
 */
int audio_get_spdif_sample_rate(void)
{
    unsigned long measured_rate = spdif_measure_frequency();
    /* Find which SPDIF sample rate we're closest to. */
    return round_value_to_list32(measured_rate, audio_master_sampr_list,
                                 SAMPR_NUM_FREQ, false);
} /* audio_get_spdif_sample_rate */
#endif /* HAVE_SPDIF_IN */

/**
 * Sets recording parameters
 */
void audio_set_recording_options(struct audio_recording_options *options)
{
    pcm_thread_wait_for_stop();

    /* stop DMA transfer */
    dma_lock = true;
    pcm_stop_recording();

    rec_frequency      = options->rec_frequency;
    rec_source         = options->rec_source;
    num_channels       = options->rec_channels == 1 ? 1 : 2;
    pre_record_ticks   = options->rec_prerecord_time * HZ;
    enc_config         = options->enc_config;
    enc_config.afmt    = rec_format_afmt[enc_config.rec_format];

#ifdef HAVE_SPDIF_IN
    if (rec_source == AUDIO_SRC_SPDIF)
    {
        /* must measure SPDIF sample rate before configuring codecs */
        unsigned long sr = spdif_measure_frequency();
        /* round to master list for SPDIF rate */
        int index = round_value_to_list32(sr, audio_master_sampr_list,
                                          SAMPR_NUM_FREQ, false);
        sample_rate = audio_master_sampr_list[index];
        /* round to HW playback rates for monitoring */
        index = round_value_to_list32(sr, hw_freq_sampr,
                                      HW_NUM_FREQ, false);
        pcm_set_frequency(hw_freq_sampr[index]);
        /* encoders with a limited number of rates do their own rounding */
    }
    else
#endif
    {
        /* set sample rate from frequency selection */
        sample_rate = rec_freq_sampr[rec_frequency];
        pcm_set_frequency(sample_rate);
    }

    pcm_set_monitor(rec_source);
    pcm_set_rec_source(rec_source);

    /* apply pcm settings to hardware */
    pcm_apply_settings(true);
    
    if (audio_load_encoder(enc_config.afmt))
    {
        /* start DMA transfer */
        pcm_record_data(pcm_rec_have_more, NULL, 0);
        /* do unlock after starting to prevent preincrement of dma_wr_pos */
        dma_lock = pre_record_ticks == 0;
    }
    else
    {
        logf("set rec opt: enc load failed");
        is_error = true;
}
} /* audio_set_recording_options */

/**
 * Note that microphone is mono, only left value is used 
 * See {uda1380,tlv320}_set_recvol() for exact ranges.
 *
 * @param type   0=line-in (radio), 1=mic
 * 
 */
void audio_set_recording_gain(int left, int right, int type)
{
    //logf("rcmrec: t=%d l=%d r=%d", type, left, right);
#if defined(HAVE_UDA1380)
    uda1380_set_recvol(left, right, type);
#elif defined (HAVE_TLV320)
    tlv320_set_recvol(left, right, type);
#endif            
} /* audio_set_recording_gain */

/**
 * Start recording
 * 
 * Use audio_set_recording_options first to select recording options
 */
void audio_record(const char *filename)
{
    logf("audio_record: %s", filename);

    pcm_thread_wait_for_stop();
    pcm_thread_sync_post(PCMREC_START, (void *)filename);

    logf("audio_record_done");
} /* audio_record */

void audio_new_file(const char *filename)
{
    logf("audio_new_file: %s", filename);

    pcm_thread_wait_for_stop();
    pcm_thread_sync_post(PCMREC_NEW_FILE, (void *)filename);

    logf("audio_new_file done");
} /* audio_new_file */

void audio_stop_recording(void)
{
    logf("audio_stop_recording");

    pcm_thread_wait_for_stop();

    if (is_recording)
        dma_lock = true;  /* fix DMA write ptr at current position */

    pcm_thread_sync_post(PCMREC_STOP, NULL);

    logf("audio_stop_recording done");
} /* audio_stop_recording */

void audio_pause_recording(void)
{
    logf("audio_pause_recording");
    
    pcm_thread_wait_for_stop();

    if (is_recording)
        dma_lock = true;  /* fix DMA write ptr at current position */
    
    pcm_thread_sync_post(PCMREC_PAUSE, NULL);
    logf("audio_pause_recording done");
} /* audio_pause_recording */
    
void audio_resume_recording(void)
{
    logf("audio_resume_recording");

    pcm_thread_wait_for_stop();
    pcm_thread_sync_post(PCMREC_RESUME, NULL);

    logf("audio_resume_recording done");
} /* audio_resume_recording */

/***************************************************************************/
/*                                                                         */
/*         Functions that execute in the context of pcmrec_thread          */
/*                                                                         */
/***************************************************************************/

/** Filename Queue **/

/* returns true if the queue is empty */
static inline bool pcmrec_fnq_is_empty(void)
{
    return  fnq_rd_pos == fnq_wr_pos;
} /* pcmrec_fnq_is_empty */

/* empties the filename queue */
static inline void pcmrec_fnq_set_empty(void)
{
    fnq_rd_pos = fnq_wr_pos;
} /* pcmrec_fnq_set_empty */
        
/* returns true if the queue is full */
static bool pcmrec_fnq_is_full(void)
{
    ssize_t size = fnq_wr_pos - fnq_rd_pos;
    if (size < 0)
        size += fnq_size;
    
    return size >= fnq_size - MAX_PATH;
} /* pcmrec_fnq_is_full */
    
/* queue another filename - will overwrite oldest one if full */
static bool pcmrec_fnq_add_filename(const char *filename)
{
    strncpy(fn_queue + fnq_wr_pos, filename, MAX_PATH);
    
    if ((fnq_wr_pos += MAX_PATH) >= fnq_size)
        fnq_wr_pos = 0;
    
    if (fnq_rd_pos != fnq_wr_pos)
        return true;

    /* queue full */
    if ((fnq_rd_pos += MAX_PATH) >= fnq_size)
        fnq_rd_pos = 0;

    return true;
} /* pcmrec_fnq_add_filename */

/* replace the last filename added */
static bool pcmrec_fnq_replace_tail(const char *filename)
{
    int pos;

    if (pcmrec_fnq_is_empty())
        return false;

    pos = fnq_wr_pos - MAX_PATH;
    if (pos < 0)
        pos = fnq_size - MAX_PATH;

    strncpy(fn_queue + pos, filename, MAX_PATH);

    return true;
} /* pcmrec_fnq_replace_tail */

/* pulls the next filename from the queue */
static bool pcmrec_fnq_get_filename(char *filename)
{
    if (pcmrec_fnq_is_empty())
        return false;

    if (filename)
        strncpy(filename, fn_queue + fnq_rd_pos, MAX_PATH);
    
    if ((fnq_rd_pos += MAX_PATH) >= fnq_size)
        fnq_rd_pos = 0;

    return true;
} /* pcmrec_fnq_get_filename */

/* close the file number pointed to by fd_p */
static void pcmrec_close_file(int *fd_p)
{
    if (*fd_p < 0)
        return; /* preserve error */

    close(*fd_p);
    *fd_p = -1;
} /* pcmrec_close_file */

/** Data Flushing **/

/**
 * called after callback to update sizes if codec changed the amount of data
 * a chunk represents
 */
static inline void pcmrec_update_sizes_inl(size_t prev_enc_size,
                                           unsigned long prev_num_pcm)
{
    if (rec_fdata.new_enc_size != prev_enc_size)
    {
        ssize_t size_diff = rec_fdata.new_enc_size - prev_enc_size;
        num_rec_bytes   += size_diff;
        accum_rec_bytes += size_diff;
    }

    if (rec_fdata.new_num_pcm != prev_num_pcm)
    {
        unsigned long pcm_diff = rec_fdata.new_num_pcm - prev_num_pcm;
        num_rec_samples   += pcm_diff;
        accum_pcm_samples += pcm_diff;
    }
} /* pcmrec_update_sizes_inl */

/* don't need to inline every instance */
static void pcmrec_update_sizes(size_t prev_enc_size,
                                unsigned long prev_num_pcm)
{
    pcmrec_update_sizes_inl(prev_enc_size, prev_num_pcm);
} /* pcmrec_update_sizes */

static void pcmrec_start_file(void)
{
    size_t        enc_size = rec_fdata.new_enc_size;
    unsigned long num_pcm  = rec_fdata.new_num_pcm;
    int curr_rec_file      = rec_fdata.rec_file;
    char filename[MAX_PATH];

    /* must always pull the filename that matches with this queue */
    if (!pcmrec_fnq_get_filename(filename))
    {
        logf("start file: fnq empty");
        *filename = '\0';
        is_error = true;
    }
    else if (is_error)
    {
        logf("start file: is_error already");
    }
    else if (curr_rec_file >= 0)
    {
        /* Any previous file should have been closed */
        logf("start file: file already open");
        is_error = true;
    }
    
    if (is_error)
        rec_fdata.chunk->flags |= CHUNKF_ERROR;

    /* encoder can set error flag here and should increase
       enc_new_size and pcm_new_size to reflect additional
       data written if any */
    rec_fdata.filename = filename;
    enc_events_callback(ENC_START_FILE, &rec_fdata);

    if (!is_error && (rec_fdata.chunk->flags & CHUNKF_ERROR))
    {
        logf("start file: enc error");
        is_error = true;
    }

    if (is_error)
    {
        pcmrec_close_file(&curr_rec_file);
        /* Write no more to this file */
        rec_fdata.chunk->flags |= CHUNKF_END_FILE;
    }
    else
    {
        pcmrec_update_sizes(enc_size, num_pcm);
    }
    
    rec_fdata.chunk->flags &= ~CHUNKF_START_FILE;
} /* pcmrec_start_file */

static inline void pcmrec_write_chunk(void)
{
    size_t        enc_size = rec_fdata.new_enc_size;
    unsigned long num_pcm  = rec_fdata.new_num_pcm;

    if (is_error)
        rec_fdata.chunk->flags |= CHUNKF_ERROR;

    enc_events_callback(ENC_WRITE_CHUNK, &rec_fdata);

    if ((long)rec_fdata.chunk->flags >= 0)
    {
        pcmrec_update_sizes_inl(enc_size, num_pcm);
    }
    else if (!is_error)
    {
        logf("wr chk enc error %d %d",
             rec_fdata.chunk->enc_size, rec_fdata.chunk->num_pcm);
        is_error = true;
    }
} /* pcmrec_write_chunk */

static void pcmrec_end_file(void)
{
    /* all data in output buffer for current file will have been
       written and encoder can now do any nescessary steps to
       finalize the written file */
    size_t        enc_size = rec_fdata.new_enc_size;
    unsigned long num_pcm  = rec_fdata.new_num_pcm;

    enc_events_callback(ENC_END_FILE, &rec_fdata);

    if (!is_error)
    {
        if (rec_fdata.chunk->flags & CHUNKF_ERROR)
        {
            logf("end file: enc error");
            is_error = true;
        }
        else
        {
            pcmrec_update_sizes(enc_size, num_pcm);
        }
    }

    /* Force file close if error */
    if (is_error)
        pcmrec_close_file(&rec_fdata.rec_file);

    rec_fdata.chunk->flags &= ~CHUNKF_END_FILE;
} /* pcmrec_end_file */

/**
 * Process the chunks
 *
 * This function is called when queue_get_w_tmo times out.
 *
 * Set flush_num to the number of files to flush to disk.
 * flush_num = -1 to flush all available chunks to disk.
 * flush_num =  0 normal write thresholding
 * flush_num =  1 or greater - all available chunks of current file plus
 *              flush_num file starts if first chunk has been processed.
 *
 */
static void pcmrec_flush(unsigned flush_num)
{
    static unsigned long last_flush_tick = 0;
    unsigned long start_tick;
    int num_ready, num;
    int prio;
    int i;

    num_ready = enc_wr_index - enc_rd_index;
    if (num_ready < 0)
        num_ready += enc_num_chunks;

    num = num_ready;

    if (flush_num == 0)
    {
        if (!is_recording)
            return;

        if (ata_spinup_time != spinup_time)
        {
            /* spinup time has changed, calculate new write threshold */
            logf("new t spinup : %d", ata_spinup_time);
            unsigned long st = spinup_time = ata_spinup_time;

            /* write at 5s + st remaining in enc_buffer */
            if (st < 2*HZ)
                st = 2*HZ; /* my drive is usually < 250 ticks :) */
            else if (st > 10*HZ)
                st = 10*HZ;

            write_threshold = enc_num_chunks -
                (int)(((5ull*HZ + st)*4ull*sample_rate + (enc_chunk_size-1)) /
                       (enc_chunk_size*HZ));

            if (write_threshold < 0)
                write_threshold = 0;
            else if (write_threshold > panic_threshold)
                write_threshold = panic_threshold;

            logf("new wr thresh: %d", write_threshold);
        }

        if (num_ready < write_threshold)
            return;

        /* if we're getting called too much and this isn't forced,
           boost stat */
        if (current_tick - last_flush_tick < HZ/2)
            num = panic_threshold;
    }

    start_tick = current_tick;
    prio = -1;

    logf("writing: %d (%d)", num_ready, flush_num);
        
    cpu_boost_id(true, CPUBOOSTID_PCMRECORD);

    for (i=0; i<num_ready; i++)
    {
        if (prio == -1 && (num >= panic_threshold ||
                           current_tick - start_tick > 10*HZ))
        {
            /* losing ground - boost priority until finished */
            logf("pcmrec: boost priority");
            prio = thread_set_priority(NULL, thread_get_priority(NULL)-1);
        }

        rec_fdata.chunk        = GET_ENC_CHUNK(enc_rd_index);
        rec_fdata.new_enc_size = rec_fdata.chunk->enc_size;
        rec_fdata.new_num_pcm  = rec_fdata.chunk->num_pcm;

        if (rec_fdata.chunk->flags & CHUNKF_START_FILE)
        {
            pcmrec_start_file();
            if (--flush_num == 0)
                i = num_ready; /* stop on next loop - must write this
                                  chunk if it has data */
        }

        pcmrec_write_chunk();

        if (rec_fdata.chunk->flags & CHUNKF_END_FILE)
            pcmrec_end_file();

        INC_ENC_INDEX(enc_rd_index);

        if (is_error)
            break;

        if (prio == -1)
        {
            num = enc_wr_index - enc_rd_index;
            if (num < 0)
                num += enc_num_chunks;
        }

        /* no yielding, the file apis called in the codecs do that */
    } /* end for */

        /* sync file */
    if (rec_fdata.rec_file >= 0)
        fsync(rec_fdata.rec_file);

        cpu_boost_id(false, CPUBOOSTID_PCMRECORD);

    if (prio != -1)
    {
        /* return to original priority */
        logf("pcmrec: unboost priority");
        thread_set_priority(NULL, prio);
    }

    last_flush_tick = current_tick; /* save tick when we left */
    logf("done");
} /* pcmrec_flush */

/**
 * Marks a new stream in the buffer and gives the encoder a chance for special
 * handling of transition from one to the next. The encoder may change the
 * chunk that ends the old stream by requesting more chunks and similiarly for
 * the new but must always advance the position though the interface. It can
 * later reject any data it cares to when writing the file but should mark the
 * chunk so it can recognize this. ENC_WRITE_CHUNK event must be able to accept
 * a NULL data pointer without error as well.
 */
static void pcmrec_new_stream(const char *filename, /* next file name */
                              unsigned long flags,  /* CHUNKF_* flags */
                              int pre_index) /* index for prerecorded data */
{
    logf("pcmrec_new_stream");

    struct enc_buffer_event_data data;
    bool (*fnq_add_fn)(const char *) = NULL;
    struct enc_chunk_hdr *start = NULL;

    int get_chunk_index(struct enc_chunk_hdr *chunk)
    {
        return ((char *)chunk - (char *)enc_buffer) / enc_chunk_size;
    }

    struct enc_chunk_hdr * get_prev_chunk(int index)
    {
        DEC_ENC_INDEX(index);
        return GET_ENC_CHUNK(index);
    }

    data.pre_chunk = NULL;
    data.chunk = GET_ENC_CHUNK(enc_wr_index);

    /* end chunk */
    if (flags & CHUNKF_END_FILE)
    {
        data.chunk->flags &= CHUNKF_START_FILE | CHUNKF_END_FILE;

        if (data.chunk->flags & CHUNKF_START_FILE)
        {
            /* cannot start and end on same unprocessed chunk */
            logf("file end on start");
            flags &= ~CHUNKF_END_FILE;
        }
        else if (enc_rd_index == enc_wr_index)
        {
            /* all data flushed but file not ended - chunk will be left
               empty */
            logf("end on dead end");
            data.chunk->flags    = 0;
            data.chunk->enc_size = 0;
            data.chunk->num_pcm  = 0;
            data.chunk->enc_data = NULL;
            INC_ENC_INDEX(enc_wr_index);
            data.chunk = GET_ENC_CHUNK(enc_wr_index);
        }
        else
        {
            struct enc_chunk_hdr *last = get_prev_chunk(enc_wr_index);

            if (last->flags & CHUNKF_END_FILE)
            {
                /* end already processed and marked - can't end twice */
                logf("file end again");
                flags &= ~CHUNKF_END_FILE;
            }
        }
    }

    /* start chunk */
    if (flags & CHUNKF_START_FILE)
    {
        bool pre = flags & CHUNKF_PRERECORD;

        if (pre)
        {
            logf("stream prerecord start");
            start = data.pre_chunk = GET_ENC_CHUNK(pre_index);
            start->flags &= CHUNKF_START_FILE | CHUNKF_PRERECORD;
        } 
        else
        {
            logf("stream normal start");
            start = data.chunk;
            start->flags &= CHUNKF_START_FILE;
        }

        /* if encoder hasn't yet processed the last start - abort the start
           of the previous file queued or else it will be empty and invalid */
        if (start->flags & CHUNKF_START_FILE)
        {
            logf("replacing fnq tail: %s", filename);
            fnq_add_fn = pcmrec_fnq_replace_tail;
        }
        else
        {
                logf("adding filename: %s", filename);
                fnq_add_fn = pcmrec_fnq_add_filename;
        }
    }

    data.flags = flags;
    enc_events_callback(ENC_REC_NEW_STREAM, &data);

    if (flags & CHUNKF_END_FILE)
    {
        int i = get_chunk_index(data.chunk);
        get_prev_chunk(i)->flags |= CHUNKF_END_FILE;
    }

    if (start)
    {
        if (!(flags & CHUNKF_PRERECORD))
        {
            /* get stats on data added to start - sort of a prerecord operation */
            int i = get_chunk_index(data.chunk);
            struct enc_chunk_hdr *chunk = data.chunk;

            logf("start data: %d %d", i, enc_wr_index);

            num_rec_bytes   = 0;
            num_rec_samples = 0;

            while (i != enc_wr_index)
            {
                num_rec_bytes   += chunk->enc_size;
                num_rec_samples += chunk->num_pcm;
                INC_ENC_INDEX(i);
                chunk = GET_ENC_CHUNK(i);
            }

            start->flags &= ~CHUNKF_START_FILE;
            start = data.chunk;
        }

        start->flags |= CHUNKF_START_FILE;

        /* flush one file out if full and adding */
        if (fnq_add_fn == pcmrec_fnq_add_filename && pcmrec_fnq_is_full())
        {
            logf("fnq full: flushing 1");
            pcmrec_flush(1);
        }
   
        fnq_add_fn(filename);
    }
} /* pcmrec_new_stream */

/** event handlers for pcmrec thread */

/* PCMREC_INIT */
static void pcmrec_init(void)
{
    rec_fdata.rec_file = -1;

    /* pcm FIFO */
    dma_lock          = true;
    pcm_rd_pos        = 0;
    dma_wr_pos        = 0;

    /* encoder FIFO */
    enc_wr_index      = 0;
    enc_rd_index      = 0;

    /* filename queue */
    fnq_rd_pos        = 0;
    fnq_wr_pos        = 0;

    /* stats */
    num_rec_bytes     = 0;
    num_rec_samples   = 0;
    accum_rec_bytes   = 0;
    accum_pcm_samples = 0;

    pcm_thread_unsignal_event(PCMREC_CLOSE);
    is_recording      = false;
    is_paused         = false;
    is_stopping       = false;
    is_error          = false;

    pcm_buffer = audio_get_recording_buffer(&rec_buffer_size);
    /* Line align pcm_buffer 2^4=16 bytes */
    pcm_buffer = (unsigned char *)ALIGN_UP_P2((unsigned)pcm_buffer, 4);
    enc_buffer = pcm_buffer + ALIGN_UP_P2(PCM_NUM_CHUNKS*PCM_CHUNK_SIZE +
                                          PCM_MAX_FEED_SIZE, 2);

    pcm_init_recording();
    pcm_thread_signal_event(PCMREC_INIT);
} /* pcmrec_init */

/* PCMREC_CLOSE */
static void pcmrec_close(void)
{
    dma_lock = true;
    pcm_close_recording();
    pcm_thread_unsignal_event(PCMREC_INIT);
    pcm_thread_signal_event(PCMREC_CLOSE);
} /* pcmrec_close */

/* PCMREC_START */
static void pcmrec_start(const char *filename)
{
    unsigned long pre_sample_ticks;
    int           rd_start;

    logf("pcmrec_start: %s", filename);

    if (is_recording) 
    {
        logf("already recording");
        goto already_recording;
    }

    /* reset stats */
    num_rec_bytes     = 0;
    num_rec_samples   = 0;
    accum_rec_bytes   = 0;
    accum_pcm_samples = 0;
    spinup_time       = -1;

    rd_start  = enc_wr_index;
    pre_sample_ticks = 0;

    if (pre_record_ticks)
    {
        int i;

        /* calculate number of available chunks */
        unsigned long avail_pre_chunks = (enc_wr_index - enc_rd_index +
                        enc_num_chunks) % enc_num_chunks;
        /* overflow at 974 seconds of prerecording at 44.1kHz */
        unsigned long pre_record_sample_ticks = enc_sample_rate*pre_record_ticks;

        /* Get exact measure of recorded data as number of samples aren't
           nescessarily going to be the max for each chunk */
        for (i = rd_start; avail_pre_chunks-- > 0;)
        {
            struct enc_chunk_hdr *chunk;
            unsigned long chunk_sample_ticks;

            DEC_ENC_INDEX(i);

            chunk = GET_ENC_CHUNK(i);

            /* must have data to be counted */
            if (chunk->enc_data == NULL)
                continue;

            chunk_sample_ticks = chunk->num_pcm*HZ;

            rd_start           = i;
            pre_sample_ticks  += chunk_sample_ticks;
            num_rec_bytes     += chunk->enc_size;
            num_rec_samples   += chunk->num_pcm;

            /* stop here if enough already */
            if (pre_sample_ticks >= pre_record_sample_ticks)
                break;
        }

        accum_rec_bytes   = num_rec_bytes;
        accum_pcm_samples = num_rec_samples;
    }

    enc_rd_index = rd_start;

    /* filename queue should be empty */
    if (!pcmrec_fnq_is_empty())
    {
        logf("fnq: not empty!");
        pcmrec_fnq_set_empty();
    }
    
    dma_lock        = false;
    is_paused = false;
    is_recording = true;

    pcmrec_new_stream(filename,
                      CHUNKF_START_FILE |
                      (pre_sample_ticks > 0 ? CHUNKF_PRERECORD : 0),
                      enc_rd_index);

already_recording:
    pcm_thread_signal_event(PCMREC_START);
    logf("pcmrec_start done");
} /* pcmrec_start */

/* PCMREC_STOP */
static void pcmrec_stop(void)
{
    logf("pcmrec_stop");
   
    if (!is_recording)
    {
        logf("not recording");
        goto not_recording_or_stopping;
    }
    else if (is_stopping)
    {
        logf("already stopping");
        goto not_recording_or_stopping;
    }

    is_stopping = true;
    dma_lock    = true;    /* lock dma write position */
    queue_post(&pcmrec_queue, PCMREC_FINISH_STOP, NULL);

not_recording_or_stopping:
    pcm_thread_signal_event(PCMREC_STOP);
    logf("pcmrec_stop done");
} /* pcmrec_stop */

/* PCMREC_FINISH_STOP */
static void pcmrec_finish_stop(void)
{
    logf("pcmrec_finish_stop");
    
    if (!is_stopping)
    {
        logf("not stopping");
        goto not_stopping;
    }
    
    /* flush all available data first to avoid overflow while waiting
       for encoding to finish */
    pcmrec_flush(-1);
    
    /* wait for encoder to finish remaining data */
    if (!is_error)
    {
        while (!wav_queue_empty)
            yield();
    }
    
    /* end stream at last data */
    pcmrec_new_stream(NULL, CHUNKF_END_FILE, 0);
    
    /* flush anything else encoder added */
    pcmrec_flush(-1);

    /* remove any pending file start not yet processed - should be at
       most one at enc_wr_index */
    pcmrec_fnq_get_filename(NULL);
    /* encoder should abort any chunk it was in midst of processing */
    GET_ENC_CHUNK(enc_wr_index)->flags = CHUNKF_ABORT;
    
    /* filename queue should be empty */
    if (!pcmrec_fnq_is_empty())
    {
        logf("fnq: not empty!");
        pcmrec_fnq_set_empty();
    }   

    /* be absolutely sure the file is closed */
    if (is_error)
        pcmrec_close_file(&rec_fdata.rec_file);
    rec_fdata.rec_file = -1;

    is_recording = false;
    is_paused    = false;
    is_stopping  = false;
    dma_lock     = pre_record_ticks == 0;

not_stopping:
    logf("pcmrec_finish_stop done");
} /* pcmrec_finish_stop */

/* PCMREC_PAUSE */
static void pcmrec_pause(void)
{
    logf("pcmrec_pause");

    if (!is_recording)
    {
        logf("not recording");
        goto not_recording_or_paused;
    }
    else if (is_paused)
    {
        logf("already paused");
        goto not_recording_or_paused;
    }
    
    dma_lock  = true;   /* fix DMA write pointer at current position */
    is_paused = true;  
    
not_recording_or_paused:
    pcm_thread_signal_event(PCMREC_PAUSE);
    logf("pcmrec_pause done");
} /* pcmrec_pause */

/* PCMREC_RESUME */
static void pcmrec_resume(void)
{
    logf("pcmrec_resume");
    
    if (!is_recording)
    {
        logf("not recording");
        goto not_recording_or_not_paused;
    }
    else if (!is_paused)
    {
        logf("not paused");
        goto not_recording_or_not_paused;
    }
    
    is_paused = false;
    is_recording = true;
    dma_lock     = false;
    
not_recording_or_not_paused:
    pcm_thread_signal_event(PCMREC_RESUME);
    logf("pcmrec_resume done");
} /* pcmrec_resume */

/* PCMREC_NEW_FILE */
static void pcmrec_new_file(const char *filename)
{
    logf("pcmrec_new_file: %s", filename);

    if (!is_recording)
    {
        logf("not recording");
        goto not_recording;
    }
    
    num_rec_bytes = 0;
    num_rec_samples = 0;

    pcmrec_new_stream(filename,
                      CHUNKF_START_FILE | CHUNKF_END_FILE,
                      0);

not_recording:
    pcm_thread_signal_event(PCMREC_NEW_FILE);
    logf("pcmrec_new_file done");
} /* pcmrec_new_file */

static void pcmrec_thread(void) __attribute__((noreturn));
static void pcmrec_thread(void)
{
    struct event ev;

    logf("thread pcmrec start");

    while(1)
    {
        if (is_recording)
        {
            /* Poll periodically to flush data */
            queue_wait_w_tmo(&pcmrec_queue, &ev, HZ/5);

            if (ev.id == SYS_TIMEOUT)
            {
                pcmrec_flush(0); /* flush if getting full */
                continue;
            }
        }
        else
        {
            /* Not doing anything - sit and wait for commands */
            queue_wait(&pcmrec_queue, &ev);
        }

        switch (ev.id)
        {
            case PCMREC_INIT: 
                pcmrec_init();
                break;

            case PCMREC_CLOSE:
                pcmrec_close();
                break;

            case PCMREC_START:
                pcmrec_start((const char *)ev.data);
                break;

            case PCMREC_STOP:
                pcmrec_stop();
                break;

            case PCMREC_FINISH_STOP:
                pcmrec_finish_stop();
                break;

            case PCMREC_PAUSE:
                pcmrec_pause();
                break;

            case PCMREC_RESUME:
                pcmrec_resume();
                break;

            case PCMREC_NEW_FILE:
                pcmrec_new_file((const char *)ev.data);
                break;

            case PCMREC_FLUSH_NUM:
                pcmrec_flush((unsigned)ev.data);
                break;

            case SYS_USB_CONNECTED:
                if (!is_recording)
                {
                    pcmrec_close();
                    usb_acknowledge(SYS_USB_CONNECTED_ACK);
                    usb_wait_for_disconnect(&pcmrec_queue);
                }
                break;
        } /* end switch */
    } /* end while */
} /* pcmrec_thread */

/****************************************************************************/
/*                                                                          */
/*         following functions will be called by the encoder codec          */
/*                                                                          */
/****************************************************************************/

/* pass the encoder settings to the encoder */
void enc_get_inputs(struct enc_inputs *inputs)
{
    inputs->sample_rate  = sample_rate;
    inputs->num_channels = num_channels;
    inputs->config       = &enc_config;
} /* enc_get_inputs */
        
/* set the encoder dimensions (called by encoder codec at initialization and
   termination) */
void enc_set_parameters(struct enc_parameters *params)
{
    size_t bufsize, resbytes;
        
    logf("enc_set_parameters");
    
    if (!params)
    {
        logf("reset");
        /* Encoder is terminating */
        memset(&enc_config, 0, sizeof (enc_config));
        enc_sample_rate = 0;
        return;
    }

    enc_sample_rate = params->enc_sample_rate;
    logf("enc sampr:%d", enc_sample_rate);

    pcm_rd_pos = dma_wr_pos;

    enc_config.afmt     = params->afmt;
    /* addition of the header is always implied - chunk size 4-byte aligned */
    enc_chunk_size      =
                ALIGN_UP_P2(ENC_CHUNK_HDR_SIZE + params->chunk_size, 2);
    enc_data_size       = enc_chunk_size - ENC_CHUNK_HDR_SIZE;
    enc_events_callback = params->events_callback;

    logf("chunk size:%d", enc_chunk_size);

    /*** Configure the buffers ***/

    /* Layout of recording buffer:
     * [ax] = possible alignment x multiple
     * [sx] = possible size alignment of x multiple
     * |[a16]|[s4]:PCM Buffer+PCM Guard|[s4 each]:Encoder Chunks|->
     * |[[s4]:Reserved Bytes]|Filename Queue->|[space]|
     */
    resbytes = ALIGN_UP_P2(params->reserve_bytes, 2);
    logf("resbytes:%d", resbytes);

    bufsize   = rec_buffer_size - (enc_buffer - pcm_buffer) -
                resbytes - FNQ_MIN_NUM_PATHS*MAX_PATH;

    enc_num_chunks = bufsize / enc_chunk_size;
    logf("num chunks:%d", enc_num_chunks);
        
    /* get real amount used by encoder chunks */
    bufsize = enc_num_chunks*enc_chunk_size;
    logf("enc size:%d", bufsize);

    /* panic boost thread priority at 1 second remaining */
    panic_threshold = enc_num_chunks -
                      (4*sample_rate + (enc_chunk_size-1)) / enc_chunk_size;
    if (panic_threshold < 0)
        panic_threshold = 0;

    logf("panic thr:%d", panic_threshold);

    /** set OUT parameters **/
    params->enc_buffer     = enc_buffer;
    params->buf_chunk_size = enc_chunk_size;
    params->num_chunks     = enc_num_chunks;

    /* calculate reserve buffer start and return pointer to encoder */
    params->reserve_buffer = NULL;
    if (resbytes > 0)
    {
        params->reserve_buffer = enc_buffer + bufsize;
        bufsize               += resbytes;
    }

    /* place filename queue at end of buffer using up whatever remains */
    fnq_rd_pos = 0; /* reset */
    fnq_wr_pos = 0; /* reset */
    fn_queue   = enc_buffer + bufsize;
    fnq_size   = pcm_buffer + rec_buffer_size - fn_queue;
    fnq_size   = ALIGN_DOWN(fnq_size, MAX_PATH);
    logf("fnq files: %d", fnq_size / MAX_PATH);

#if 0
    logf("ab :%08X", (unsigned long)audiobuf);
    logf("pcm:%08X", (unsigned long)pcm_buffer);
    logf("enc:%08X", (unsigned long)enc_buffer);
    logf("res:%08X", (unsigned long)params->reserve_buffer);
    logf("fnq:%08X", (unsigned long)fn_queue);
    logf("end:%08X", (unsigned long)fn_queue + fnq_size);
    logf("abe:%08X", (unsigned long)audiobufend);
#endif

    /* init all chunk headers and reset indexes */
    enc_rd_index = 0;
    for (enc_wr_index = enc_num_chunks; enc_wr_index > 0; )
        GET_ENC_CHUNK(--enc_wr_index)->flags = 0;

    logf("enc_set_parameters done");
} /* enc_set_parameters */

/* return encoder chunk at current write position */
struct enc_chunk_hdr * enc_get_chunk(void)
{
    struct enc_chunk_hdr *chunk = GET_ENC_CHUNK(enc_wr_index);
    chunk->flags &= CHUNKF_START_FILE;

    if (!is_recording)
        chunk->flags |= CHUNKF_PRERECORD;

    return chunk;
} /* enc_get_chunk */

/* releases the current chunk into the available chunks */
void enc_finish_chunk(void)
{
    struct enc_chunk_hdr *chunk = GET_ENC_CHUNK(enc_wr_index);

    /* encoder may have set error flag or written too much data */
    if ((long)chunk->flags < 0 || chunk->enc_size > enc_data_size)
    {
        is_error = true;

#ifdef ROCKBOX_HAS_LOGF
        if (chunk->enc_size > enc_data_size)
        {
            /* illegal to scribble over next chunk */
            logf("finish chk ovf: %d>%d", chunk->enc_size, enc_data_size);
        }
        else
        {
            /* encoder set error flag */
            logf("finish chk enc error");
        }
#endif
    }

    /* advance enc_wr_index to the next encoder chunk */
    INC_ENC_INDEX(enc_wr_index);

    if (enc_rd_index != enc_wr_index)
    {
        num_rec_bytes      += chunk->enc_size;
        accum_rec_bytes    += chunk->enc_size;
        num_rec_samples    += chunk->num_pcm;
        accum_pcm_samples  += chunk->num_pcm;
    }
    else if (is_recording)        /* buffer full */
    {
        /* keep current position */
        logf("enc_buffer ovf");
        DEC_ENC_INDEX(enc_wr_index);
    }
    else
    {
        /* advance enc_rd_index for prerecording */
        INC_ENC_INDEX(enc_rd_index);
    }
} /* enc_finish_chunk */

/* checks near empty state on pcm input buffer */
int enc_pcm_buf_near_empty(void)
{
    /* less than 1sec raw data? => unboost encoder */
    size_t avail = (dma_wr_pos - pcm_rd_pos) & PCM_CHUNK_MASK;
    return avail < (sample_rate << 2) ? 1 : 0;
} /* enc_pcm_buf_near_empty */

/* passes a pointer to next chunk of unprocessed wav data */
/* TODO: this really should give the actual size returned */
unsigned char * enc_get_pcm_data(size_t size)
{
    size_t avail = (dma_wr_pos - pcm_rd_pos) & PCM_CHUNK_MASK;

    /* limit the requested pcm data size */
    if (size > PCM_MAX_FEED_SIZE)
        size = PCM_MAX_FEED_SIZE;

    if (avail >= size)
    {
        unsigned char *ptr = pcm_buffer + pcm_rd_pos;
        pcm_rd_pos = (pcm_rd_pos + size) & PCM_CHUNK_MASK;

        /* ptr must point to continous data at wraparound position */
        if ((size_t)pcm_rd_pos < size)
            memcpy(pcm_buffer + PCM_NUM_CHUNKS*PCM_CHUNK_SIZE,
                   pcm_buffer, pcm_rd_pos);

        wav_queue_empty = false;
        return ptr;
    }

    /* not enough data available - encoder should idle */
    wav_queue_empty = true;
    return NULL;
} /* enc_get_pcm_data */

/* puts some pcm data back in the queue */
size_t enc_unget_pcm_data(size_t size)
{
    /* can't let DMA advance write position when doing this */
    int level = set_irq_level(HIGHEST_IRQ_LEVEL);

    if (pcm_rd_pos != dma_wr_pos)
    {
        /* disallow backing up into current DMA write chunk  */
        size_t old_avail = (pcm_rd_pos - dma_wr_pos - PCM_CHUNK_SIZE)
                            & PCM_CHUNK_MASK;

        /* limit size to amount of old data remaining */
        if (size > old_avail)
            size = old_avail;

        pcm_rd_pos = (pcm_rd_pos - size) & PCM_CHUNK_MASK;
    }

    set_irq_level(level);

    return size;
} /* enc_unget_pcm_data */

/** Low level pcm recording apis **/

/****************************************************************************
 * Functions that do not require targeted implementation but only a targeted
 * interface
 */
void pcm_record_data(pcm_more_callback_type more_ready,
                     unsigned char *start, size_t size)
{
    pcm_callback_more_ready = more_ready;

    if (!(start && size))
    {
        size = 0;
        if (more_ready)
            more_ready(&start, &size);
    }

    if (start && size)
        pcm_rec_dma_start(start, size);
} /* pcm_record_data */

void pcm_stop_recording(void)
{
    if (pcm_recording)
        pcm_rec_dma_stop();
} /* pcm_stop_recording */