summaryrefslogtreecommitdiffstats
path: root/apps/playback.c
blob: 4fd27ce72eba0188faefbdffcf709a03780db439 (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
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2005 Miika Pekkarinen
 *
 * 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.
 *
 ****************************************************************************/

/* TODO: Pause should be handled in here, rather than PCMBUF so that voice can
 * play whilst audio is paused */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>

#include "system.h"
#include "thread.h"
#include "file.h"
#include "panic.h"
#include "memory.h"
#include "lcd.h"
#include "font.h"
#include "button.h"
#include "kernel.h"
#include "tree.h"
#include "debug.h"
#include "sprintf.h"
#include "settings.h"
#include "codecs.h"
#include "audio.h"
#include "buffering.h"
#include "voice_thread.h"
#include "mp3_playback.h"
#include "usb.h"
#include "status.h"
#include "ata.h"
#include "screens.h"
#include "playlist.h"
#include "playback.h"
#include "pcmbuf.h"
#include "buffer.h"
#include "dsp.h"
#include "abrepeat.h"
#include "cuesheet.h"
#ifdef HAVE_TAGCACHE
#include "tagcache.h"
#endif
#ifdef HAVE_LCD_BITMAP
#include "icons.h"
#include "peakmeter.h"
#include "action.h"
#include "albumart.h"
#endif
#include "lang.h"
#include "bookmark.h"
#include "misc.h"
#include "sound.h"
#include "metadata.h"
#include "splash.h"
#include "talk.h"
#include "ata_idle_notify.h"

#ifdef HAVE_RECORDING
#include "recording.h"
#include "talk.h"
#endif

#define PLAYBACK_VOICE

/* default point to start buffer refill */
#define AUDIO_DEFAULT_WATERMARK      (1024*512)
/* amount of guess-space to allow for codecs that must hunt and peck
 * for their correct seeek target, 32k seems a good size */
#define AUDIO_REBUFFER_GUESS_SIZE    (1024*32)

/* Define LOGF_ENABLE to enable logf output in this file */
/*#define LOGF_ENABLE*/
#include "logf.h"

/* macros to enable logf for queues
   logging on SYS_TIMEOUT can be disabled */
#ifdef SIMULATOR
/* Define this for logf output of all queuing except SYS_TIMEOUT */
#define PLAYBACK_LOGQUEUES
/* Define this to logf SYS_TIMEOUT messages */
/*#define PLAYBACK_LOGQUEUES_SYS_TIMEOUT*/
#endif

#ifdef PLAYBACK_LOGQUEUES
#define LOGFQUEUE logf
#else
#define LOGFQUEUE(...)
#endif

#ifdef PLAYBACK_LOGQUEUES_SYS_TIMEOUT
#define LOGFQUEUE_SYS_TIMEOUT logf
#else
#define LOGFQUEUE_SYS_TIMEOUT(...)
#endif


/* Define one constant that includes recording related functionality */
#if defined(HAVE_RECORDING) && !defined(SIMULATOR)
#define AUDIO_HAVE_RECORDING
#endif

enum {
    Q_NULL = 0,
    Q_AUDIO_PLAY = 1,
    Q_AUDIO_STOP,
    Q_AUDIO_PAUSE,
    Q_AUDIO_SKIP,
    Q_AUDIO_PRE_FF_REWIND,
    Q_AUDIO_FF_REWIND,
    Q_AUDIO_CHECK_NEW_TRACK,
    Q_AUDIO_FLUSH,
    Q_AUDIO_TRACK_CHANGED,
    Q_AUDIO_DIR_SKIP,
    Q_AUDIO_POSTINIT,
    Q_AUDIO_FILL_BUFFER,
    Q_CODEC_REQUEST_COMPLETE,
    Q_CODEC_REQUEST_FAILED,

    Q_CODEC_LOAD,
    Q_CODEC_LOAD_DISK,

#ifdef AUDIO_HAVE_RECORDING
    Q_ENCODER_LOAD_DISK,
    Q_ENCODER_RECORD,
#endif
};

/* As defined in plugins/lib/xxx2wav.h */
#if MEM > 1
#define MALLOC_BUFSIZE (512*1024)
#define GUARD_BUFSIZE  (32*1024)
#else
#define MALLOC_BUFSIZE (100*1024)
#define GUARD_BUFSIZE  (8*1024)
#endif

/* As defined in plugin.lds */
#if defined(CPU_PP)
#define CODEC_IRAM_ORIGIN   ((unsigned char *)0x4000c000)
#define CODEC_IRAM_SIZE     ((size_t)0xc000)
#elif defined(IAUDIO_X5) || defined(IAUDIO_M5)
#define CODEC_IRAM_ORIGIN   ((unsigned char *)0x10010000)
#define CODEC_IRAM_SIZE     ((size_t)0x10000)
#else
#define CODEC_IRAM_ORIGIN   ((unsigned char *)0x1000c000)
#define CODEC_IRAM_SIZE     ((size_t)0xc000)
#endif

bool audio_is_initialized = false;
static bool audio_thread_ready NOCACHEBSS_ATTR = false;

/* Variables are commented with the threads that use them: *
 * A=audio, C=codec, V=voice. A suffix of - indicates that *
 * the variable is read but not updated on that thread.    */
/* TBD: Split out "audio" and "playback" (ie. calling) threads */

/* Main state control */
static volatile bool audio_codec_loaded NOCACHEBSS_ATTR = false; /* Codec loaded? (C/A-) */
static volatile bool playing NOCACHEBSS_ATTR = false; /* Is audio playing? (A) */
static volatile bool paused NOCACHEBSS_ATTR = false; /* Is audio paused? (A/C-) */

/* Ring buffer where compressed audio and codecs are loaded */
static unsigned char *filebuf = NULL;       /* Start of buffer (A/C-) */
static unsigned char *malloc_buf = NULL;    /* Start of malloc buffer (A/C-) */
/* FIXME: make filebuflen static */
size_t filebuflen = 0;                      /* Size of buffer (A/C-) */
/* FIXME: make buf_ridx (C/A-) */

/* Possible arrangements of the buffer */
#define BUFFER_STATE_TRASHED        -1          /* trashed; must be reset */
#define BUFFER_STATE_INITIALIZED     0          /* voice+audio OR audio-only */
#define BUFFER_STATE_VOICED_ONLY     1          /* voice-only */
static int buffer_state = BUFFER_STATE_TRASHED; /* Buffer state */

/* Used to keep the WPS up-to-date during track transtition */
static struct mp3entry prevtrack_id3;

/* Used to provide the codec with a pointer */
static struct mp3entry curtrack_id3;

/* Used to make next track info available while playing last track on buffer */
static struct mp3entry lasttrack_id3;

/* Track info structure about songs in the file buffer (A/C-) */
struct track_info {
    int audio_hid;             /* The ID for the track's buffer handle */
    int id3_hid;               /* The ID for the track's metadata handle */
    int codec_hid;             /* The ID for the track's codec handle */
#ifdef HAVE_ALBUMART
    int aa_hid;                /* The ID for the track's album art handle */
#endif

    size_t filesize;           /* File total length */

    bool taginfo_ready;        /* Is metadata read */
};

static struct track_info tracks[MAX_TRACK];
static volatile int track_ridx = 0;  /* Track being decoded (A/C-) */
static int track_widx = 0;           /* Track being buffered (A) */

#define CUR_TI (&tracks[track_ridx]) /* Playing track info pointer (A/C-) */
static struct track_info *prev_ti = NULL;  /* Pointer to the previously played
                                              track */

/* Set by the audio thread when the current track information has updated
 * and the WPS may need to update its cached information */
static bool track_changed = false;

/* Information used only for filling the buffer */
/* Playlist steps from playing track to next track to be buffered (A) */
static int last_peek_offset = 0;

/* Scrobbler support */
static unsigned long prev_track_elapsed = 0; /* Previous track elapsed time (C/A-)*/

/* Track change controls */
static bool automatic_skip = false; /* Who initiated in-progress skip? (C/A-) */
static bool playlist_end = false;   /* Has the current playlist ended? (A) */
static bool auto_dir_skip = false;  /* Have we changed dirs automatically? */
static bool dir_skip = false;       /* Is a directory skip pending? (A) */
static bool new_playlist = false;   /* Are we starting a new playlist? (A) */
static int wps_offset = 0;          /* Pending track change offset, to keep WPS responsive (A) */
static bool skipped_during_pause = false; /* Do we need to clear the PCM buffer when playback resumes (A) */

/* Set to true if the codec thread should send an audio stop request
 * (typically because the end of the playlist has been reached).
 */
static bool codec_requested_stop = false;

static size_t buffer_margin  = 0; /* Buffer margin aka anti-skip buffer (A/C-) */

/* Multiple threads */
/* Set the watermark to trigger buffer fill (A/C) FIXME */
static void set_filebuf_watermark(const int seconds, const size_t max);

/* Audio thread */
static struct event_queue       audio_queue NOCACHEBSS_ATTR;
static struct queue_sender_list audio_queue_sender_list NOCACHEBSS_ATTR;
static long audio_stack[(DEFAULT_STACK_SIZE + 0x1000)/sizeof(long)];
static const char audio_thread_name[] = "audio";

static void audio_thread(void);
static void audio_initiate_track_change(long direction);
static bool audio_have_tracks(void);
static void audio_reset_buffer(void);

/* Codec thread */
extern struct codec_api ci;
static struct event_queue codec_queue NOCACHEBSS_ATTR;
static struct queue_sender_list codec_queue_sender_list;
static long codec_stack[(DEFAULT_STACK_SIZE + 0x2000)/sizeof(long)]
IBSS_ATTR;
static const char codec_thread_name[] = "codec";
struct thread_entry *codec_thread_p; /* For modifying thread priority later. */

/* PCM buffer messaging */
static struct event_queue pcmbuf_queue NOCACHEBSS_ATTR;

/* Function to be called by pcm buffer callbacks.
 * Permissible Context(s): Audio interrupt
 */
static void pcmbuf_callback_queue_post(const long id, intptr_t data)
{
    /* No lock since we're already in audio interrupt context */
    queue_post(&pcmbuf_queue, id, data);
}

/* Scan the pcmbuf queue and return true if a message pulled.
 * Permissible Context(s): Thread
 */
static bool pcmbuf_queue_scan(struct queue_event *ev)
{
    if (!queue_empty(&pcmbuf_queue))
    {
        /* Transfer message to audio queue */
        pcm_play_lock();
        /* Pull message - never, ever any blocking call! */
        queue_wait_w_tmo(&pcmbuf_queue, ev, 0);
        pcm_play_unlock();
        return true;
    }

    return false;
}

/* Clear the pcmbuf queue of messages
 * Permissible Context(s): Thread
 */
static void pcmbuf_queue_clear(void)
{
    pcm_play_lock();
    queue_clear(&pcmbuf_queue);
    pcm_play_unlock();
}

/* --- Helper functions --- */

static struct mp3entry *bufgetid3(const int handle_id)
{
    if (handle_id < 0)
        return NULL;

    struct mp3entry *id3;
    ssize_t ret = bufgetdata(handle_id, 0, (void *)&id3);

    if (ret < 0 || ret != sizeof(struct mp3entry))
        return NULL;

    return id3;
}

static bool clear_track_info(struct track_info *track)
{
    /* bufclose returns true if the handle is not found, or if it is closed
     * successfully, so these checks are safe on non-existant handles */
    if (!track)
        return false;

    if (track->codec_hid >= 0) {
        if (bufclose(track->codec_hid))
            track->codec_hid = -1;
        else
            return false;
    }

    if (track->id3_hid >= 0) {
        if (bufclose(track->id3_hid))
            track->id3_hid = -1;
        else
            return false;
    }

    if (track->audio_hid >= 0) {
        if (bufclose(track->audio_hid))
            track->audio_hid = -1;
        else
            return false;
    }

#ifdef HAVE_ALBUMART
    if (track->aa_hid >= 0) {
        if (bufclose(track->aa_hid))
            track->aa_hid = -1;
        else
            return false;
    }
#endif

    track->filesize = 0;
    track->taginfo_ready = false;

    return true;
}

/* --- External interfaces --- */

/* This sends a stop message and the audio thread will dump all it's
   subsequenct messages */
void audio_hard_stop(void)
{
    /* Stop playback */
    LOGFQUEUE("audio >| audio Q_AUDIO_STOP: 1");
    queue_send(&audio_queue, Q_AUDIO_STOP, 1);
#ifdef PLAYBACK_VOICE
    voice_stop();
#endif
}

bool audio_restore_playback(const int type)
{
    switch (type)
    {
    case AUDIO_WANT_PLAYBACK:
        if (buffer_state != BUFFER_STATE_INITIALIZED)
            audio_reset_buffer();
        return true;
    case AUDIO_WANT_VOICE:
        if (buffer_state == BUFFER_STATE_TRASHED)
            audio_reset_buffer();
        return true;
    default:
        return false;
    }
}

unsigned char *audio_get_buffer(const bool talk_buf, size_t *buffer_size)
{
    unsigned char *buf, *end;

    if (audio_is_initialized)
    {
        audio_hard_stop();
    }
    /* else buffer_state will be BUFFER_STATE_TRASHED at this point */

    if (buffer_size == NULL)
    {
        /* Special case for talk_init to use since it already knows it's
           trashed */
        buffer_state = BUFFER_STATE_TRASHED;
        return NULL;
    }

    if (talk_buf || buffer_state == BUFFER_STATE_TRASHED
           || !talk_voice_required())
    {
        logf("get buffer: talk, audio");
        /* Ok to use everything from audiobuf to audiobufend - voice is loaded,
           the talk buffer is not needed because voice isn't being used, or
           could be BUFFER_STATE_TRASHED already. If state is
           BUFFER_STATE_VOICED_ONLY, no problem as long as memory isn't written
           without the caller knowing what's going on. Changing certain settings
           may move it to a worse condition but the memory in use by something
           else will remain undisturbed.
         */
        if (buffer_state != BUFFER_STATE_TRASHED)
        {
            talk_buffer_steal();
            buffer_state = BUFFER_STATE_TRASHED;
        }

        buf = audiobuf;
        end = audiobufend;
    }
    else
    {
        /* Safe to just return this if already BUFFER_STATE_VOICED_ONLY or
           still BUFFER_STATE_INITIALIZED */
        /* Skip talk buffer and move pcm buffer to end to maximize available
           contiguous memory - no audio running means voice will not need the
           swap space */
        logf("get buffer: audio");
        buf = audiobuf + talk_get_bufsize();
        end = audiobufend - pcmbuf_init(audiobufend);
        buffer_state = BUFFER_STATE_VOICED_ONLY;
    }

    *buffer_size = end - buf;

    return buf;
}

#ifdef HAVE_RECORDING
unsigned char *audio_get_recording_buffer(size_t *buffer_size)
{
    /* Stop audio, voice and obtain all available buffer space */
    audio_hard_stop();
    talk_buffer_steal();

    unsigned char *end = audiobufend;
    buffer_state = BUFFER_STATE_TRASHED;
    *buffer_size = end - audiobuf;

    return (unsigned char *)audiobuf;
}

bool audio_load_encoder(int afmt)
{
#ifndef SIMULATOR
    const char *enc_fn = get_codec_filename(afmt | CODEC_TYPE_ENCODER);
    if (!enc_fn)
        return false;

    audio_remove_encoder();
    ci.enc_codec_loaded = 0; /* clear any previous error condition */

    LOGFQUEUE("codec > Q_ENCODER_LOAD_DISK");
    queue_post(&codec_queue, Q_ENCODER_LOAD_DISK, (intptr_t)enc_fn);

    while (ci.enc_codec_loaded == 0)
        yield();

    logf("codec loaded: %d", ci.enc_codec_loaded);

    return ci.enc_codec_loaded > 0;
#else
    (void)afmt;
    return true;
#endif
} /* audio_load_encoder */

void audio_remove_encoder(void)
{
#ifndef SIMULATOR
    /* force encoder codec unload (if currently loaded) */
    if (ci.enc_codec_loaded <= 0)
        return;

    ci.stop_encoder = true;
    while (ci.enc_codec_loaded > 0)
        yield();
#endif
} /* audio_remove_encoder */

#endif /* HAVE_RECORDING */

#ifdef HAVE_ALBUMART
int audio_current_aa_hid(void)
{
    int cur_idx;
    int offset = ci.new_track + wps_offset;

    cur_idx = track_ridx + offset;
    cur_idx &= MAX_TRACK_MASK;

    return tracks[cur_idx].aa_hid;
}
#endif

struct mp3entry* audio_current_track(void)
{
    const char *filename;
    const char *p;
    static struct mp3entry temp_id3;
    int cur_idx;
    int offset = ci.new_track + wps_offset;

    cur_idx = (track_ridx + offset) & MAX_TRACK_MASK;

    if (cur_idx == track_ridx && *curtrack_id3.path)
    {
        /* The usual case */
        return &curtrack_id3;
    }
    else if (offset == -1 && *prevtrack_id3.path)
    {
        /* We're in a track transition. The codec has moved on to the nex track,
           but the audio being played is still the same (now previous) track.
           prevtrack_id3.elapsed is being updated in an ISR by
           codec_pcmbuf_position_callback */
        return &prevtrack_id3;
    }
    else if (tracks[cur_idx].id3_hid >= 0)
    {
        /* Get the ID3 metadata from the main buffer */
        return bufgetid3(tracks[cur_idx].id3_hid);
    }

    /* We didn't find the ID3 metadata, so we fill temp_id3 with the little info
       we have and return that. */

    memset(&temp_id3, 0, sizeof(struct mp3entry));

    filename = playlist_peek(0);
    if (!filename)
        filename = "No file!";

#if defined(HAVE_TC_RAMCACHE) && defined(HAVE_DIRCACHE)
    if (tagcache_fill_tags(&temp_id3, filename))
        return &temp_id3;
#endif

    p = strrchr(filename, '/');
    if (!p)
        p = filename;
    else
        p++;

    strncpy(temp_id3.path, p, sizeof(temp_id3.path)-1);
    temp_id3.title = &temp_id3.path[0];

    return &temp_id3;
}

struct mp3entry* audio_next_track(void)
{
    int next_idx;
    int offset = ci.new_track + wps_offset;

    if (!audio_have_tracks())
        return NULL;

    if (wps_offset == -1 && *prevtrack_id3.path)
    {
        /* We're in a track transition. The next track for the WPS is the one
           currently being decoded. */
        return &curtrack_id3;
    }

    next_idx = (track_ridx + offset + 1) & MAX_TRACK_MASK;

    if (next_idx == track_widx)
    {
        /* The next track hasn't been buffered yet, so we return the static
           version of its metadata. */
        return &lasttrack_id3;
    }

    if (tracks[next_idx].id3_hid < 0)
        return NULL;
    else
        return bufgetid3(tracks[next_idx].id3_hid);
}

bool audio_has_changed_track(void)
{
    if (track_changed)
    {
        track_changed = false;
        return true;
    }

    return false;
}

void audio_play(const long offset)
{
    logf("audio_play");

#ifdef PLAYBACK_VOICE
    /* Truncate any existing voice output so we don't have spelling
     * etc. over the first part of the played track */
    talk_force_shutup();
#endif

    /* Start playback */
    LOGFQUEUE("audio >| audio Q_AUDIO_PLAY: %ld", offset);
    /* Don't return until playback has actually started */
    queue_send(&audio_queue, Q_AUDIO_PLAY, offset);
}

void audio_stop(void)
{
    /* Stop playback */
    LOGFQUEUE("audio >| audio Q_AUDIO_STOP");
    /* Don't return until playback has actually stopped */
    queue_send(&audio_queue, Q_AUDIO_STOP, 0);
}

void audio_pause(void)
{
    LOGFQUEUE("audio >| audio Q_AUDIO_PAUSE");
    /* Don't return until playback has actually paused */
    queue_send(&audio_queue, Q_AUDIO_PAUSE, true);
}

void audio_resume(void)
{
    LOGFQUEUE("audio >| audio Q_AUDIO_PAUSE resume");
    /* Don't return until playback has actually resumed */
    queue_send(&audio_queue, Q_AUDIO_PAUSE, false);
}

static void audio_skip(int direction)
{
    if (playlist_check(ci.new_track + wps_offset + direction))
    {
        if (global_settings.beep)
            pcmbuf_beep(5000, 100, 2500*global_settings.beep);

        LOGFQUEUE("audio > audio Q_AUDIO_SKIP %d", direction);
        queue_post(&audio_queue, Q_AUDIO_SKIP, direction);
        /* Update wps while our message travels inside deep playback queues. */
        wps_offset += direction;
        /* Immediately update the playlist index */
        playlist_next(direction);
        track_changed = true;
    }
    else
    {
        /* No more tracks. */
        if (global_settings.beep)
            pcmbuf_beep(1000, 100, 1000*global_settings.beep);
    }
}

void audio_next(void)
{
    audio_skip(1);
}

void audio_prev(void)
{
    audio_skip(-1);
}

void audio_next_dir(void)
{
    LOGFQUEUE("audio > audio Q_AUDIO_DIR_SKIP 1");
    queue_post(&audio_queue, Q_AUDIO_DIR_SKIP, 1);
}

void audio_prev_dir(void)
{
    LOGFQUEUE("audio > audio Q_AUDIO_DIR_SKIP -1");
    queue_post(&audio_queue, Q_AUDIO_DIR_SKIP, -1);
}

void audio_pre_ff_rewind(void)
{
    LOGFQUEUE("audio > audio Q_AUDIO_PRE_FF_REWIND");
    queue_post(&audio_queue, Q_AUDIO_PRE_FF_REWIND, 0);
}

void audio_ff_rewind(const long newpos)
{
    LOGFQUEUE("audio > audio Q_AUDIO_FF_REWIND");
    queue_post(&audio_queue, Q_AUDIO_FF_REWIND, newpos);
}

void audio_flush_and_reload_tracks(void)
{
    LOGFQUEUE("audio > audio Q_AUDIO_FLUSH");
    queue_post(&audio_queue, Q_AUDIO_FLUSH, 0);
}

void audio_error_clear(void)
{
#ifdef AUDIO_HAVE_RECORDING
    pcm_rec_error_clear();
#endif
}

int audio_status(void)
{
    int ret = 0;

    if (playing)
        ret |= AUDIO_STATUS_PLAY;

    if (paused)
        ret |= AUDIO_STATUS_PAUSE;

#ifdef HAVE_RECORDING
    /* Do this here for constitency with mpeg.c version */
    ret |= pcm_rec_status();
#endif

    return ret;
}

int audio_get_file_pos(void)
{
    return 0;
}

#ifndef HAVE_FLASH_STORAGE
void audio_set_buffer_margin(const int setting)
{
    static const int lookup[] = {5, 15, 30, 60, 120, 180, 300, 600};
    buffer_margin = lookup[setting];
    logf("buffer margin: %ld", (long)buffer_margin);
    set_filebuf_watermark(buffer_margin, 0);
}
#endif

/* Take necessary steps to enable or disable the crossfade setting */
void audio_set_crossfade(const int enable)
{
    size_t offset;
    bool was_playing;
    size_t size;

    /* Tell it the next setting to use */
    pcmbuf_crossfade_enable(enable);

    /* Return if size hasn't changed or this is too early to determine
       which in the second case there's no way we could be playing
       anything at all */
    if (pcmbuf_is_same_size())
    {
        /* This function is a copout and just syncs some variables -
           to be removed at a later date */
        pcmbuf_crossfade_enable_finished();
        return;
    }

    offset = 0;
    was_playing = playing;

    /* Playback has to be stopped before changing the buffer size */
    if (was_playing)
    {
        /* Store the track resume position */
        offset = curtrack_id3.offset;
        gui_syncsplash(0, str(LANG_RESTARTING_PLAYBACK));
    }

    /* Blast it - audio buffer will have to be setup again next time
       something plays */
    audio_get_buffer(true, &size);

    /* Restart playback if audio was running previously */
    if (was_playing)
        audio_play(offset);
}

/* --- Routines called from multiple threads --- */

static void set_filebuf_watermark(const int seconds, const size_t max)
{
    size_t bytes;

    if (!filebuf)
        return;     /* Audio buffers not yet set up */

    bytes = seconds?MAX(curtrack_id3.bitrate * seconds * (1000/8), max):max;
    bytes = MIN(bytes, filebuflen / 2);
    buf_set_watermark(bytes);
}

const char *get_codec_filename(const int cod_spec)
{
    const char *fname;

#ifdef HAVE_RECORDING
    /* Can choose decoder or encoder if one available */
    int type = cod_spec & CODEC_TYPE_MASK;
    int afmt = cod_spec & CODEC_AFMT_MASK;

    if ((unsigned)afmt >= AFMT_NUM_CODECS)
        type = AFMT_UNKNOWN | (type & CODEC_TYPE_MASK);

    fname = (type == CODEC_TYPE_ENCODER) ?
                audio_formats[afmt].codec_enc_root_fn :
                audio_formats[afmt].codec_root_fn;

    logf("%s: %d - %s",
        (type == CODEC_TYPE_ENCODER) ? "Encoder" : "Decoder",
        afmt, fname ? fname : "<unknown>");
#else /* !HAVE_RECORDING */
    /* Always decoder */
    if ((unsigned)cod_spec >= AFMT_NUM_CODECS)
        cod_spec = AFMT_UNKNOWN;
    fname = audio_formats[cod_spec].codec_root_fn;
    logf("Codec: %d - %s",  cod_spec, fname ? fname : "<unknown>");
#endif /* HAVE_RECORDING */

    return fname;
} /* get_codec_filename */

/* --- Codec thread --- */
static bool codec_pcmbuf_insert_callback(
        const void *ch1, const void *ch2, const int count)
{
    const char *src[2] = { ch1, ch2 };

    int remaining = count;
    while (remaining > 0)
    {
        int out_count = dsp_output_count(ci.dsp, remaining);
        int inp_count;
        char *dest;

        /* Prevent audio from a previous track from playing */
        if (ci.new_track || ci.stop_codec)
            return true;

        while ((dest = pcmbuf_request_buffer(&out_count)) == NULL)
        {
            cancel_cpu_boost();
            sleep(1);
            if (ci.seek_time || ci.new_track || ci.stop_codec)
                return true;
        }

        /* Get the real input_size for output_size bytes, guarding
         * against resampling buffer overflows. */
        inp_count = dsp_input_count(ci.dsp, out_count);

        if (inp_count <= 0)
            return true;

        /* Input size has grown, no error, just don't write more than length */
        if (inp_count > remaining)
            inp_count = remaining;

        out_count = dsp_process(ci.dsp, dest, src, inp_count);

        if (out_count <= 0)
            return true;

        pcmbuf_write_complete(out_count);

        remaining -= inp_count;
    }

    return true;
} /* codec_pcmbuf_insert_callback */

static void* codec_get_memory_callback(size_t *size)
{
    *size = MALLOC_BUFSIZE;
    return malloc_buf;
}

/* Between the codec and PCM track change, we need to keep updating the
   "elapsed" value of the previous (to the codec, but current to the
   user/PCM/WPS) track, so that the progressbar reaches the end.
   During that transition, the WPS will display prevtrack_id3. */
static void codec_pcmbuf_position_callback(const size_t size) ICODE_ATTR;
static void codec_pcmbuf_position_callback(const size_t size)
{
    /* This is called from an ISR, so be quick */
    unsigned int time = size * 1000 / 4 / NATIVE_FREQUENCY +
        prevtrack_id3.elapsed;

    if (time >= prevtrack_id3.length)
    {
        pcmbuf_set_position_callback(NULL);
        prevtrack_id3.elapsed = prevtrack_id3.length;
    }
    else
        prevtrack_id3.elapsed = time;
}

static void codec_set_elapsed_callback(const unsigned int value)
{
    unsigned int latency;
    if (ci.seek_time)
        return;

#ifdef AB_REPEAT_ENABLE
    ab_position_report(value);
#endif

    latency = pcmbuf_get_latency();
    if (value < latency)
        curtrack_id3.elapsed = 0;
    else if (value - latency > curtrack_id3.elapsed ||
            value - latency < curtrack_id3.elapsed - 2)
    {
        curtrack_id3.elapsed = value - latency;
    }
}

static void codec_set_offset_callback(const size_t value)
{
    unsigned int latency;

    if (ci.seek_time)
        return;

    latency = pcmbuf_get_latency() * curtrack_id3.bitrate / 8;
    if (value < latency)
        curtrack_id3.offset = 0;
    else
        curtrack_id3.offset = value - latency;
}

static void codec_advance_buffer_counters(const size_t amount)
{
    bufadvance(CUR_TI->audio_hid, amount);
    ci.curpos += amount;
}

/* copy up-to size bytes into ptr and return the actual size copied */
static size_t codec_filebuf_callback(void *ptr, const size_t size)
{
    ssize_t copy_n;

    if (ci.stop_codec || !playing)
        return 0;

    copy_n = bufread(CUR_TI->audio_hid, size, ptr);

    /* Nothing requested OR nothing left */
    if (copy_n == 0)
        return 0;

    /* Update read and other position pointers */
    codec_advance_buffer_counters(copy_n);

    /* Return the actual amount of data copied to the buffer */
    return copy_n;
} /* codec_filebuf_callback */

static void* codec_request_buffer_callback(size_t *realsize, const size_t reqsize)
{
    size_t copy_n = reqsize;
    ssize_t ret;
    void *ptr;

    if (!playing)
    {
        *realsize = 0;
        return NULL;
    }

    ret = bufgetdata(CUR_TI->audio_hid, reqsize, &ptr);
    if (ret >= 0)
        copy_n = MIN((size_t)ret, reqsize);

    if (copy_n == 0)
    {
        *realsize = 0;
        return NULL;
    }

    *realsize = copy_n;

    return ptr;
} /* codec_request_buffer_callback */

static int get_codec_base_type(int type)
{
    switch (type) {
        case AFMT_MPA_L1:
        case AFMT_MPA_L2:
        case AFMT_MPA_L3:
            return AFMT_MPA_L3;
    }

    return type;
}

static void codec_advance_buffer_callback(const size_t amount)
{
    codec_advance_buffer_counters(amount);
    codec_set_offset_callback(ci.curpos);
}

static void codec_advance_buffer_loc_callback(void *ptr)
{
    size_t amount = buf_get_offset(CUR_TI->audio_hid, ptr);
    codec_advance_buffer_callback(amount);
}

/* Copied from mpeg.c. Should be moved somewhere else. */
static int codec_get_file_pos(void)
{
    int pos = -1;
    struct mp3entry *id3 = audio_current_track();

    if (id3->vbr)
    {
        if (id3->has_toc)
        {
            /* Use the TOC to find the new position */
            unsigned int percent, remainder;
            int curtoc, nexttoc, plen;

            percent = (id3->elapsed*100)/id3->length;
            if (percent > 99)
                percent = 99;

            curtoc = id3->toc[percent];

            if (percent < 99)
                nexttoc = id3->toc[percent+1];
            else
                nexttoc = 256;

            pos = (id3->filesize/256)*curtoc;

            /* Use the remainder to get a more accurate position */
            remainder   = (id3->elapsed*100)%id3->length;
            remainder   = (remainder*100)/id3->length;
            plen        = (nexttoc - curtoc)*(id3->filesize/256);
            pos        += (plen/100)*remainder;
        }
        else
        {
            /* No TOC exists, estimate the new position */
            pos = (id3->filesize / (id3->length / 1000)) *
                (id3->elapsed / 1000);
        }
    }
    else if (id3->bitrate)
        pos = id3->elapsed * (id3->bitrate / 8);
    else
        return -1;

    pos += id3->first_frame_offset;

    /* Don't seek right to the end of the file so that we can
       transition properly to the next song */
    if (pos >= (int)(id3->filesize - id3->id3v1len))
        pos = id3->filesize - id3->id3v1len - 1;

    return pos;
}

static off_t codec_mp3_get_filepos_callback(const int newtime)
{
    off_t newpos;

    curtrack_id3.elapsed = newtime;
    newpos = codec_get_file_pos();

    return newpos;
}

static void codec_seek_complete_callback(void)
{
    logf("seek_complete");
    if (pcm_is_paused())
    {
        /* If this is not a seamless seek, clear the buffer */
        pcmbuf_play_stop();
        dsp_configure(ci.dsp, DSP_FLUSH, 0);

        /* If playback was not 'deliberately' paused, unpause now */
        if (!paused)
            pcmbuf_pause(false);
    }
    ci.seek_time = 0;
}

static bool codec_seek_buffer_callback(const size_t newpos)
{
    logf("codec_seek_buffer_callback");

    int ret = bufseek(CUR_TI->audio_hid, newpos);
    if (ret == 0) {
        ci.curpos = newpos;
        return true;
    }
    else {
        return false;
    }
}

static void codec_configure_callback(const int setting, const intptr_t value)
{
    switch (setting) {
    case CODEC_SET_FILEBUF_WATERMARK:
        set_filebuf_watermark(buffer_margin, value);
        break;

    default:
        if (!dsp_configure(ci.dsp, setting, value))
            { logf("Illegal key:%d", setting); }
    }
}

static void codec_track_changed(void)
{
    LOGFQUEUE("codec > audio Q_AUDIO_TRACK_CHANGED");
    queue_post(&audio_queue, Q_AUDIO_TRACK_CHANGED, 0);
}

static void codec_pcmbuf_track_changed_callback(void)
{
    pcmbuf_set_position_callback(NULL);
    pcmbuf_callback_queue_post(Q_AUDIO_TRACK_CHANGED, 0);
}

static void codec_discard_codec_callback(void)
{
    if (CUR_TI->codec_hid >= 0)
    {
        bufclose(CUR_TI->codec_hid);
        CUR_TI->codec_hid = -1;
    }
}

static inline void codec_gapless_track_change(void)
{
    /* callback keeps the progress bar moving while the pcmbuf empties */
    pcmbuf_set_position_callback(codec_pcmbuf_position_callback);
    /* set the pcmbuf callback for when the track really changes */
    pcmbuf_set_event_handler(codec_pcmbuf_track_changed_callback);
}

static inline void codec_crossfade_track_change(void)
{
    /* Initiate automatic crossfade mode */
    pcmbuf_crossfade_init(false);
    /* Notify the wps that the track change starts now */
    codec_track_changed();
}

static void codec_track_skip_done(const bool was_manual)
{
    /* Manual track change (always crossfade or flush audio). */
    if (was_manual)
    {
        pcmbuf_crossfade_init(true);
        LOGFQUEUE("codec > audio Q_AUDIO_TRACK_CHANGED");
        queue_post(&audio_queue, Q_AUDIO_TRACK_CHANGED, 0);
    }
    /* Automatic track change w/crossfade, if not in "Track Skip Only" mode. */
    else if (pcmbuf_is_crossfade_enabled() && !pcmbuf_is_crossfade_active()
             && global_settings.crossfade != CROSSFADE_ENABLE_TRACKSKIP)
    {
        if (global_settings.crossfade == CROSSFADE_ENABLE_SHUFFLE_AND_TRACKSKIP)
        {
            if (global_settings.playlist_shuffle)
                /* shuffle mode is on, so crossfade: */
                codec_crossfade_track_change();
            else
                /* shuffle mode is off, so do a gapless track change */
                codec_gapless_track_change();
        }
        else
            /* normal crossfade:  */
            codec_crossfade_track_change();
    }
    else
        /* normal gapless playback. */
        codec_gapless_track_change();
}

static bool codec_load_next_track(void)
{
    intptr_t result = Q_CODEC_REQUEST_FAILED;

    prev_track_elapsed = curtrack_id3.elapsed;

#ifdef AB_REPEAT_ENABLE
    ab_end_of_track_report();
#endif

    logf("Request new track");

    if (ci.new_track == 0)
    {
        ci.new_track++;
        automatic_skip = true;
    }

    if (!ci.stop_codec)
    {
        trigger_cpu_boost();
        LOGFQUEUE("codec >| audio Q_AUDIO_CHECK_NEW_TRACK");
        result = queue_send(&audio_queue, Q_AUDIO_CHECK_NEW_TRACK, 0);
    }

    switch (result)
    {
        case Q_CODEC_REQUEST_COMPLETE:
            LOGFQUEUE("codec |< Q_CODEC_REQUEST_COMPLETE");
            codec_track_skip_done(!automatic_skip);
            return true;

        case Q_CODEC_REQUEST_FAILED:
            LOGFQUEUE("codec |< Q_CODEC_REQUEST_FAILED");
            ci.new_track = 0;
            ci.stop_codec = true;
            codec_requested_stop = true;
            return false;

        default:
            LOGFQUEUE("codec |< default");
            ci.stop_codec = true;
            codec_requested_stop = true;
            return false;
    }
}

static bool codec_request_next_track_callback(void)
{
    int prev_codectype;

    if (ci.stop_codec || !playing)
        return false;

    prev_codectype = get_codec_base_type(curtrack_id3.codectype);

    if (!codec_load_next_track())
        return false;

    /* Check if the next codec is the same file. */
    if (prev_codectype == get_codec_base_type(curtrack_id3.codectype))
    {
        logf("New track loaded");
        codec_discard_codec_callback();
        return true;
    }
    else
    {
        logf("New codec:%d/%d", curtrack_id3.codectype, prev_codectype);
        return false;
    }
}

static void codec_thread(void)
{
    struct queue_event ev;
    int status;

    while (1) {
        status = 0;
        cancel_cpu_boost();
        queue_wait(&codec_queue, &ev);
        codec_requested_stop = false;

        switch (ev.id) {
            case Q_CODEC_LOAD_DISK:
                LOGFQUEUE("codec < Q_CODEC_LOAD_DISK");
                queue_reply(&codec_queue, 1);
                audio_codec_loaded = true;
                ci.stop_codec = false;
                status = codec_load_file((const char *)ev.data, &ci);
                break;

            case Q_CODEC_LOAD:
                LOGFQUEUE("codec < Q_CODEC_LOAD");
                if (CUR_TI->codec_hid < 0) {
                    logf("Codec slot is empty!");
                    /* Wait for the pcm buffer to go empty */
                    while (pcm_is_playing())
                        yield();
                    /* This must be set to prevent an infinite loop */
                    ci.stop_codec = true;
                    LOGFQUEUE("codec > codec Q_AUDIO_PLAY");
                    queue_post(&codec_queue, Q_AUDIO_PLAY, 0);
                    break;
                }

                audio_codec_loaded = true;
                ci.stop_codec = false;
                status = codec_load_buf(CUR_TI->codec_hid, &ci);
                break;

#ifdef AUDIO_HAVE_RECORDING
            case Q_ENCODER_LOAD_DISK:
                LOGFQUEUE("codec < Q_ENCODER_LOAD_DISK");
                audio_codec_loaded = false; /* Not audio codec! */
                logf("loading encoder");
                ci.stop_encoder = false;
                status = codec_load_file((const char *)ev.data, &ci);
                logf("encoder stopped");
                break;
#endif /* AUDIO_HAVE_RECORDING */

            default:
                LOGFQUEUE("codec < default");
        }

        if (audio_codec_loaded)
        {
            if (ci.stop_codec)
            {
                status = CODEC_OK;
                if (!playing)
                    pcmbuf_play_stop();

            }
            audio_codec_loaded = false;
        }

        switch (ev.id) {
            case Q_CODEC_LOAD_DISK:
            case Q_CODEC_LOAD:
                LOGFQUEUE("codec < Q_CODEC_LOAD");
                if (playing)
                {
                    if (ci.new_track || status != CODEC_OK)
                    {
                        if (!ci.new_track)
                        {
                            logf("Codec failure");
                            gui_syncsplash(HZ*2, "Codec failure");
                        }

                        if (!codec_load_next_track())
                        {
                            LOGFQUEUE("codec > audio Q_AUDIO_STOP");
                            /* End of playlist */
                            queue_post(&audio_queue, Q_AUDIO_STOP, 0);
                            break;
                        }
                    }
                    else
                    {
                        logf("Codec finished");
                        if (ci.stop_codec)
                        {
                            /* Wait for the audio to stop playing before
                             * triggering the WPS exit */
                            while(pcm_is_playing())
                            {
                                curtrack_id3.elapsed =
                                    curtrack_id3.length - pcmbuf_get_latency();
                                sleep(1);
                            }

                            if (codec_requested_stop)
                            {
                                LOGFQUEUE("codec > audio Q_AUDIO_STOP");
                                queue_post(&audio_queue, Q_AUDIO_STOP, 0);
                            }
                            break;
                        }
                    }

                    if (CUR_TI->codec_hid >= 0)
                    {
                        LOGFQUEUE("codec > codec Q_CODEC_LOAD");
                        queue_post(&codec_queue, Q_CODEC_LOAD, 0);
                    }
                    else
                    {
                        const char *codec_fn =
                            get_codec_filename(curtrack_id3.codectype);
                        if (codec_fn)
                        {
                            LOGFQUEUE("codec > codec Q_CODEC_LOAD_DISK");
                            queue_post(&codec_queue, Q_CODEC_LOAD_DISK,
                                       (intptr_t)codec_fn);
                        }
                    }
                }
                break;

#ifdef AUDIO_HAVE_RECORDING
            case Q_ENCODER_LOAD_DISK:
                LOGFQUEUE("codec < Q_ENCODER_LOAD_DISK");

                if (status == CODEC_OK)
                    break;

                logf("Encoder failure");
                gui_syncsplash(HZ*2, "Encoder failure");

                if (ci.enc_codec_loaded < 0)
                    break;

                logf("Encoder failed to load");
                ci.enc_codec_loaded = -1;
                break;
#endif /* AUDIO_HAVE_RECORDING */

            default:
                LOGFQUEUE("codec < default");

        } /* end switch */
    }
}


/* --- Audio thread --- */

static bool audio_have_tracks(void)
{
    return (audio_track_count() != 0);
}

static int audio_free_track_count(void)
{
    /* Used tracks + free tracks adds up to MAX_TRACK - 1 */
    return MAX_TRACK - 1 - audio_track_count();
}

int audio_track_count(void)
{
    /* Calculate difference from track_ridx to track_widx
     * taking into account a possible wrap-around. */
    return (MAX_TRACK + track_widx - track_ridx) & MAX_TRACK_MASK;
}

long audio_filebufused(void)
{
    return (long) buf_used();
}

/* Update track info after successful a codec track change */
static void audio_update_trackinfo(void)
{
    /* Load the curent track's metadata into curtrack_id3 */
    CUR_TI->taginfo_ready = (CUR_TI->id3_hid >= 0);
    if (CUR_TI->id3_hid >= 0)
        copy_mp3entry(&curtrack_id3, bufgetid3(CUR_TI->id3_hid));

    int next_idx = (track_ridx + 1) & MAX_TRACK_MASK;
    tracks[next_idx].taginfo_ready = (tracks[next_idx].id3_hid >= 0);

    /* Reset current position */
    curtrack_id3.elapsed = 0;
    curtrack_id3.offset = 0;

    /* Update the codec API */
    ci.filesize = CUR_TI->filesize;
    ci.id3 = &curtrack_id3;
    ci.curpos = 0;
    ci.taginfo_ready = &CUR_TI->taginfo_ready;
}

static void buffering_audio_callback(const enum callback_event ev, const int value)
{
    (void)value;
    logf("buffering_audio_callback");

    switch (ev)
    {
        case EVENT_BUFFER_LOW:
            LOGFQUEUE("buffering > audio Q_AUDIO_FILL_BUFFER");
            queue_remove_from_head(&audio_queue, Q_AUDIO_FILL_BUFFER);
            queue_post(&audio_queue, Q_AUDIO_FILL_BUFFER, 0);
            break;

        case EVENT_HANDLE_REBUFFER:
            LOGFQUEUE("audio >| audio Q_AUDIO_FLUSH");
            queue_send(&audio_queue, Q_AUDIO_FLUSH, 0);
            break;

        case EVENT_HANDLE_FINISHED:
            logf("handle %d finished buffering", value);
            strip_tags(value);
            break;

        default:
            break;
    }
}

/* Clear tracks between write and read, non inclusive */
static void audio_clear_track_entries(void)
{
    int cur_idx = track_widx;

    logf("Clearing tracks:%d/%d", track_ridx, track_widx);

    /* Loop over all tracks from write-to-read */
    while (1)
    {
        cur_idx = (cur_idx + 1) & MAX_TRACK_MASK;

        if (cur_idx == track_ridx)
            break;

        clear_track_info(&tracks[cur_idx]);
    }
}

/* Clear all tracks */
static bool audio_release_tracks(void)
{
    int i, cur_idx;

    logf("releasing all tracks");

    for(i = 0; i < MAX_TRACK; i++)
    {
        cur_idx = (track_ridx + i) & MAX_TRACK_MASK;
        if (!clear_track_info(&tracks[cur_idx]))
            return false;
    }

    return true;
}

static bool audio_loadcodec(const bool start_play)
{
    int prev_track;
    char codec_path[MAX_PATH]; /* Full path to codec */

    if (tracks[track_widx].id3_hid < 0) {
        return false;
    }

    const char * codec_fn =
        get_codec_filename(bufgetid3(tracks[track_widx].id3_hid)->codectype);
    if (codec_fn == NULL)
        return false;

    tracks[track_widx].codec_hid = -1;

    if (start_play)
    {
        /* Load the codec directly from disk and save some memory. */
        track_ridx = track_widx;
        ci.filesize = CUR_TI->filesize;
        ci.id3 = &curtrack_id3;
        ci.taginfo_ready = &CUR_TI->taginfo_ready;
        ci.curpos = 0;
        LOGFQUEUE("codec > codec Q_CODEC_LOAD_DISK");
        queue_post(&codec_queue, Q_CODEC_LOAD_DISK, (intptr_t)codec_fn);
        return true;
    }
    else
    {
        /* If we already have another track than this one buffered */
        if (track_widx != track_ridx)
        {
            prev_track = (track_widx - 1) & MAX_TRACK_MASK;

            /* If the previous codec is the same as this one, there is no need
             * to put another copy of it on the file buffer */
            if (get_codec_base_type(
                        bufgetid3(tracks[track_widx].id3_hid)->codectype) ==
                get_codec_base_type(
                        bufgetid3(tracks[prev_track].id3_hid)->codectype)
                && audio_codec_loaded)
            {
                logf("Reusing prev. codec");
                return true;
            }
        }
    }

    codec_get_full_path(codec_path, codec_fn);

    tracks[track_widx].codec_hid = bufopen(codec_path, 0, TYPE_CODEC);
    if (tracks[track_widx].codec_hid < 0)
        return false;

    logf("Loaded codec");

    return true;
}

/* TODO: Copied from mpeg.c. Should be moved somewhere else. */
static void audio_set_elapsed(struct mp3entry* id3)
{
    unsigned long offset = id3->offset > id3->first_frame_offset ?
        id3->offset - id3->first_frame_offset : 0;

    if ( id3->vbr ) {
        if ( id3->has_toc ) {
            /* calculate elapsed time using TOC */
            int i;
            unsigned int remainder, plen, relpos, nextpos;

            /* find wich percent we're at */
            for (i=0; i<100; i++ )
                if ( offset < id3->toc[i] * (id3->filesize / 256) )
                    break;

            i--;
            if (i < 0)
                i = 0;

            relpos = id3->toc[i];

            if (i < 99)
                nextpos = id3->toc[i+1];
            else
                nextpos = 256;

            remainder = offset - (relpos * (id3->filesize / 256));

            /* set time for this percent (divide before multiply to prevent
               overflow on long files. loss of precision is negligible on
               short files) */
            id3->elapsed = i * (id3->length / 100);

            /* calculate remainder time */
            plen = (nextpos - relpos) * (id3->filesize / 256);
            id3->elapsed += (((remainder * 100) / plen) *
                             (id3->length / 10000));
        }
        else {
            /* no TOC exists. set a rough estimate using average bitrate */
            int tpk = id3->length /
                ((id3->filesize - id3->first_frame_offset - id3->id3v1len) /
                1024);
            id3->elapsed = offset / 1024 * tpk;
        }
    }
    else
    {
        /* constant bitrate, use exact calculation */
        if (id3->bitrate != 0)
            id3->elapsed = offset / (id3->bitrate / 8);
    }
}

/* Load one track by making the appropriate bufopen calls. Return true if
   everything required was loaded correctly, false if not. */
static bool audio_load_track(const int offset, const bool start_play)
{
    const char *trackname;
    char msgbuf[80];
    int fd = -1;
    int file_offset = 0;
    struct mp3entry id3;

    /* Stop buffer filling if there is no free track entries.
       Don't fill up the last track entry (we wan't to store next track
       metadata there). */
    if (!audio_free_track_count())
    {
        logf("No free tracks");
        return false;
    }

    last_peek_offset++;
    tracks[track_widx].taginfo_ready = false;

    peek_again:
    logf("Buffering track:%d/%d", track_widx, track_ridx);
    /* Get track name from current playlist read position. */
    while ((trackname = playlist_peek(last_peek_offset)) != NULL)
    {
        /* Handle broken playlists. */
        fd = open(trackname, O_RDONLY);
        if (fd < 0)
        {
            logf("Open failed");
            /* Skip invalid entry from playlist. */
            playlist_skip_entry(NULL, last_peek_offset);
        }
        else
            break;
    }

    if (!trackname)
    {
        logf("End-of-playlist");
        playlist_end = true;
        memset(&lasttrack_id3, 0, sizeof(struct mp3entry));
        return false;
    }

    tracks[track_widx].filesize = filesize(fd);

    int adjusted_offset = offset;
    if ((unsigned)adjusted_offset > tracks[track_widx].filesize)
        adjusted_offset = 0;

    /* Set default values */
    if (start_play)
    {
        buf_set_watermark(AUDIO_DEFAULT_WATERMARK);
        dsp_configure(ci.dsp, DSP_RESET, 0);
        track_changed = true;
        playlist_update_resume_info(audio_current_track());
    }

    /* Get track metadata if we don't already have it. */
    if (tracks[track_widx].id3_hid < 0)
    {
        if (get_metadata(&id3, fd, trackname))
        {
            send_event(PLAYBACK_EVENT_TRACK_BUFFER, &id3);
            
            tracks[track_widx].id3_hid =
                bufalloc(&id3, sizeof(struct mp3entry), TYPE_ID3);

            if (tracks[track_widx].id3_hid < 0)
            {
                last_peek_offset--;
                close(fd);
                copy_mp3entry(&lasttrack_id3, &id3);
                return false;
            }

            if (track_widx == track_ridx)
                copy_mp3entry(&curtrack_id3, &id3);

            if (start_play)
            {
                track_changed = true;
                playlist_update_resume_info(audio_current_track());
            }
        }
        else
        {
            logf("mde:%s!",trackname);

            /* Skip invalid entry from playlist. */
            playlist_skip_entry(NULL, last_peek_offset);
            close(fd);
            goto peek_again;
        }

    }

    close(fd);

#if 0
    if (cuesheet_is_enabled() && tracks[track_widx].id3.cuesheet_type == 1)
    {
        char cuepath[MAX_PATH];

        struct cuesheet *cue = start_play ? curr_cue : temp_cue;

        if (look_for_cuesheet_file(trackname, cuepath) &&
            parse_cuesheet(cuepath, cue))
        {
            strcpy((cue)->audio_filename, trackname);
            if (start_play)
                cue_spoof_id3(curr_cue, &tracks[track_widx].id3);
        }
    }
#endif

    struct mp3entry *track_id3;

    if (track_widx == track_ridx)
        track_id3 = &curtrack_id3;
    else
        track_id3 = bufgetid3(tracks[track_widx].id3_hid);

#ifdef HAVE_ALBUMART
    if (tracks[track_widx].aa_hid < 0 && gui_sync_wps_uses_albumart())
    {
        char aa_path[MAX_PATH];
        if (find_albumart(track_id3, aa_path, sizeof(aa_path)))
            tracks[track_widx].aa_hid = bufopen(aa_path, 0, TYPE_BITMAP);
    }
#endif

    /* Load the codec. */
    if (!audio_loadcodec(start_play))
    {
        if (tracks[track_widx].codec_hid == ERR_BUFFER_FULL)
        {
            /* No space for codec on buffer, not an error */
            return false;
        }

        /* This is an error condition, either no codec was found, or reading
         * the codec file failed part way through, either way, skip the track */
        snprintf(msgbuf, sizeof(msgbuf)-1, "No codec for: %s", trackname);
        /* We should not use gui_syncplash from audio thread! */
        gui_syncsplash(HZ*2, msgbuf);
        /* Skip invalid entry from playlist. */
        playlist_skip_entry(NULL, last_peek_offset);
        goto peek_again;
    }

    track_id3->elapsed = 0;

    enum data_type type = TYPE_PACKET_AUDIO;

    switch (track_id3->codectype) {
    case AFMT_MPA_L1:
    case AFMT_MPA_L2:
    case AFMT_MPA_L3:
        if (adjusted_offset > 0) {
            file_offset = adjusted_offset;
            track_id3->offset = adjusted_offset;
            audio_set_elapsed(track_id3);
        }
        break;

    case AFMT_WAVPACK:
        if (offset > 0) {
            file_offset = adjusted_offset;
            track_id3->offset = adjusted_offset;
            track_id3->elapsed = track_id3->length / 2;
        }
        break;

    case AFMT_OGG_VORBIS:
    case AFMT_SPEEX:
    case AFMT_FLAC:
    case AFMT_PCM_WAV:
    case AFMT_A52:
    case AFMT_AAC:
    case AFMT_MPC:
    case AFMT_APE:
        if (adjusted_offset > 0)
            track_id3->offset = adjusted_offset;
        break;

    case AFMT_NSF:
    case AFMT_SPC:
    case AFMT_SID:
        logf("Loading atomic %d",track_id3->codectype);
        type = TYPE_ATOMIC_AUDIO;
        break;
    }

    logf("alt:%s", trackname);

    if (file_offset > AUDIO_REBUFFER_GUESS_SIZE)
        file_offset -= AUDIO_REBUFFER_GUESS_SIZE;
    else if (track_id3->first_frame_offset)
        file_offset = track_id3->first_frame_offset;
    else
        file_offset = 0;

    tracks[track_widx].audio_hid = bufopen(trackname, file_offset, type);

    if (tracks[track_widx].audio_hid < 0)
        return false;

    /* All required data is now available for the codec. */
    tracks[track_widx].taginfo_ready = true;

    if (start_play)
    {
        ci.curpos=file_offset;
        buf_request_buffer_handle(tracks[track_widx].audio_hid);
    }

    track_widx = (track_widx + 1) & MAX_TRACK_MASK;

    return true;
}

static void audio_fill_file_buffer(const bool start_play, const size_t offset)
{
    struct queue_event ev;
    bool had_next_track = audio_next_track() != NULL;
    bool continue_buffering;

    /* No need to rebuffer if there are track skips pending. */
    if (ci.new_track != 0)
        return;

    /* Must reset the buffer before use if trashed or voice only - voice
       file size shouldn't have changed so we can go straight from
       BUFFER_STATE_VOICED_ONLY to BUFFER_STATE_INITIALIZED */
    if (buffer_state != BUFFER_STATE_INITIALIZED)
        audio_reset_buffer();

    logf("Starting buffer fill");

    if (!start_play)
        audio_clear_track_entries();

    /* Save the current resume position once. */
    playlist_update_resume_info(audio_current_track());

    continue_buffering = audio_load_track(offset, start_play);
    do {
        sleep(1);
        if (queue_peek(&audio_queue, &ev)) {
            if (ev.id != Q_AUDIO_FILL_BUFFER)
            {
                /* There's a message in the queue. break the loop to treat it,
                and go back to filling after that. */
                LOGFQUEUE("buffering > audio Q_AUDIO_FILL_BUFFER");
                queue_post(&audio_queue, Q_AUDIO_FILL_BUFFER, 0);
            }
            break;
        }
        continue_buffering = audio_load_track(0, false);
    } while (continue_buffering);

    if (!had_next_track && audio_next_track())
        track_changed = true;

}

static void audio_rebuffer(void)
{
    logf("Forcing rebuffer");

    clear_track_info(CUR_TI);

    /* Reset track pointers */
    track_widx = track_ridx;
    audio_clear_track_entries();

    /* Fill the buffer */
    last_peek_offset = -1;
    ci.curpos = 0;

    if (!CUR_TI->taginfo_ready)
        memset(&curtrack_id3, 0, sizeof(struct mp3entry));

    audio_fill_file_buffer(false, 0);
}

/* Called on request from the codec to get a new track. This is the codec part
   of the track transition. */
static int audio_check_new_track(void)
{
    int track_count = audio_track_count();
    int old_track_ridx = track_ridx;
    int i, idx;
    int next_playlist_index;
    bool forward;
    bool end_of_playlist;  /* Temporary flag, not the same as playlist_end */

    /* Now it's good time to send track unbuffer events. */
    send_event(PLAYBACK_EVENT_TRACK_FINISH, &curtrack_id3);
    
    if (dir_skip)
    {
        dir_skip = false;
        if (playlist_next_dir(ci.new_track))
        {
            ci.new_track = 0;
            audio_rebuffer();
            goto skip_done;
        }
        else
        {
            LOGFQUEUE("audio >|= codec Q_CODEC_REQUEST_FAILED");
            return Q_CODEC_REQUEST_FAILED;
        }
    }

    if (new_playlist)
        ci.new_track = 0;

    end_of_playlist = playlist_peek(automatic_skip ? ci.new_track : 0) == NULL;
    auto_dir_skip = end_of_playlist && global_settings.next_folder;

    /* If the playlist isn't that big */
    if (automatic_skip && !playlist_check(ci.new_track))
    {
        if (ci.new_track >= 0)
        {
            LOGFQUEUE("audio >|= codec Q_CODEC_REQUEST_FAILED");
            return Q_CODEC_REQUEST_FAILED;
        }
        /* Find the beginning backward if the user over-skips it */
        while (!playlist_check(++ci.new_track))
            if (ci.new_track >= 0)
            {
                LOGFQUEUE("audio >|= codec Q_CODEC_REQUEST_FAILED");
                return Q_CODEC_REQUEST_FAILED;
            }
    }

    /* Update the playlist */
    last_peek_offset -= ci.new_track;

    if (auto_dir_skip)
    {
        /* If the track change was the result of an auto dir skip,
           we need to update the playlist now */
        next_playlist_index = playlist_next(ci.new_track);

        if (next_playlist_index < 0)
        {
            LOGFQUEUE("audio >|= codec Q_CODEC_REQUEST_FAILED");
            return Q_CODEC_REQUEST_FAILED;
        }
    }

    if (new_playlist)
    {
        ci.new_track = 1;
        new_playlist = false;
    }

    /* Save the track metadata to allow the WPS to display it
       while PCM finishes playing that track */
    copy_mp3entry(&prevtrack_id3, &curtrack_id3);

    /* Update the main buffer copy of the track metadata with the one
       the codec has been using (for the unbuffer callbacks) */
    if (CUR_TI->id3_hid >= 0)
        copy_mp3entry(bufgetid3(CUR_TI->id3_hid), &curtrack_id3);

    /* Save a pointer to the old track to allow later clearing */
    prev_ti = CUR_TI;

    for (i = 0; i < ci.new_track; i++)
    {
        idx = (track_ridx + i) & MAX_TRACK_MASK;
        struct mp3entry *id3 = bufgetid3(tracks[idx].id3_hid);
        ssize_t offset = buf_handle_offset(tracks[idx].audio_hid);
        if (!id3 || offset < 0 || (unsigned)offset > id3->first_frame_offset)
        {
            /* We don't have all the audio data for that track, so clear it,
               but keep the metadata. */
            if (tracks[idx].audio_hid >= 0 && bufclose(tracks[idx].audio_hid))
            {
                tracks[idx].audio_hid = -1;
                tracks[idx].filesize = 0;
            }
        }
    }

    /* Move to the new track */
    track_ridx = (track_ridx + ci.new_track) & MAX_TRACK_MASK;

    buf_set_base_handle(CUR_TI->audio_hid);

    if (automatic_skip)
    {
        playlist_end = false;
        wps_offset = -ci.new_track;
        track_changed = true;
    }

    /* If it is not safe to even skip this many track entries */
    if (ci.new_track >= track_count || ci.new_track <= track_count - MAX_TRACK)
    {
        ci.new_track = 0;
        audio_rebuffer();
        goto skip_done;
    }

    forward = ci.new_track > 0;
    ci.new_track = 0;

    /* If the target track is clearly not in memory */
    if (CUR_TI->filesize == 0 || !CUR_TI->taginfo_ready)
    {
        audio_rebuffer();
        goto skip_done;
    }

    /* When skipping backwards, it is possible that we've found a track that's
     * buffered, but which is around the track-wrap and therefor not the track
     * we are looking for */
    if (!forward)
    {
        int cur_idx = track_ridx;
        bool taginfo_ready = true;
        /* We've wrapped the buffer backwards if new > old */
        bool wrap = track_ridx > old_track_ridx;

        while (1)
        {
            cur_idx = (cur_idx + 1) & MAX_TRACK_MASK;

            /* if we've advanced past the wrap when cur_idx is zeroed */
            if (!cur_idx)
                wrap = false;

            /* if we aren't still on the wrap and we've caught the old track */
            if (!(wrap || cur_idx < old_track_ridx))
                break;

            /* If we hit a track in between without valid tag info, bail */
            if (!tracks[cur_idx].taginfo_ready)
            {
                taginfo_ready = false;
                break;
            }
        }
        if (!taginfo_ready)
        {
            audio_rebuffer();
        }
    }

skip_done:
    audio_update_trackinfo();
    LOGFQUEUE("audio >|= codec Q_CODEC_REQUEST_COMPLETE");
    return Q_CODEC_REQUEST_COMPLETE;
}

unsigned long audio_prev_elapsed(void)
{
    return prev_track_elapsed;
}

static void audio_stop_codec_flush(void)
{
    ci.stop_codec = true;
    pcmbuf_pause(true);

    while (audio_codec_loaded)
        yield();

    /* If the audio codec is not loaded any more, and the audio is still
     * playing, it is now and _only_ now safe to call this function from the
     * audio thread */
    if (pcm_is_playing())
    {
        pcmbuf_play_stop();
        pcmbuf_queue_clear();
    }
    pcmbuf_pause(paused);
}

static void audio_stop_playback(void)
{
    /* If we were playing, save resume information */
    if (playing)
    {
        struct mp3entry *id3 = NULL;

        if (!playlist_end || !ci.stop_codec)
        {
            /* Set this early, the outside code yields and may allow the codec
               to try to wait for a reply on a buffer wait */
            ci.stop_codec = true;
            id3 = audio_current_track();
        }

        /* Save the current playing spot, or NULL if the playlist has ended */
        playlist_update_resume_info(id3);

        /* TODO: Create auto bookmark too? */

        prev_track_elapsed = curtrack_id3.elapsed;
    }

    paused = false;
    audio_stop_codec_flush();
    playing = false;

    /* Mark all entries null. */
    audio_clear_track_entries();

    /* Close all tracks */
    audio_release_tracks();

    unregister_buffering_callback(buffering_audio_callback);

    memset(&curtrack_id3, 0, sizeof(struct mp3entry));
}

static void audio_play_start(const size_t offset)
{
    int i;

#if INPUT_SRC_CAPS != 0
    audio_set_input_source(AUDIO_SRC_PLAYBACK, SRCF_PLAYBACK);
    audio_set_output_source(AUDIO_SRC_PLAYBACK);
#endif

    /* Wait for any previously playing audio to flush - TODO: Not necessary? */
    paused = false;
    audio_stop_codec_flush();

    track_changed = true;
    playlist_end = false;

    playing = true;

    ci.new_track = 0;
    ci.seek_time = 0;
    wps_offset = 0;

    sound_set_volume(global_settings.volume);
    track_widx = track_ridx = 0;

    /* Clear all track entries. */
    for (i = 0; i < MAX_TRACK; i++) {
        clear_track_info(&tracks[i]);
    }

    last_peek_offset = -1;

    /* Officially playing */
    queue_reply(&audio_queue, 1);

#ifndef HAVE_FLASH_STORAGE
    set_filebuf_watermark(buffer_margin, 0);
#endif
    audio_fill_file_buffer(true, offset);
    register_buffering_callback(buffering_audio_callback);

    LOGFQUEUE("audio > audio Q_AUDIO_TRACK_CHANGED");
    queue_post(&audio_queue, Q_AUDIO_TRACK_CHANGED, 0);
}


/* Invalidates all but currently playing track. */
static void audio_invalidate_tracks(void)
{
    if (audio_have_tracks())
    {
        last_peek_offset = 0;
        playlist_end = false;
        track_widx = track_ridx;

        /* Mark all other entries null (also buffered wrong metadata). */
        audio_clear_track_entries();

        track_widx = (track_widx + 1) & MAX_TRACK_MASK;

        audio_fill_file_buffer(false, 0);
    }
}

static void audio_new_playlist(void)
{
    /* Prepare to start a new fill from the beginning of the playlist */
    last_peek_offset = -1;
    if (audio_have_tracks())
    {
        if (paused)
            skipped_during_pause = true;
        playlist_end = false;
        track_widx = track_ridx;
        audio_clear_track_entries();

        track_widx = (track_widx + 1) & MAX_TRACK_MASK;

        /* Mark the current track as invalid to prevent skipping back to it */
        CUR_TI->taginfo_ready = false;
    }

    /* Signal the codec to initiate a track change forward */
    new_playlist = true;
    ci.new_track = 1;

    /* Officially playing */
    queue_reply(&audio_queue, 1);

    audio_fill_file_buffer(false, 0);
}

/* Called on manual track skip */
static void audio_initiate_track_change(const long direction)
{
    logf("audio_initiate_track_change(%ld)", direction);

    playlist_end = false;
    ci.new_track += direction;
    wps_offset -= direction;
    if (paused)
        skipped_during_pause = true;
}

/* Called on manual dir skip */
static void audio_initiate_dir_change(const long direction)
{
    playlist_end = false;
    dir_skip = true;
    ci.new_track = direction;
    if (paused)
        skipped_during_pause = true;
}

/* Called when PCM track change is complete */
static void audio_finalise_track_change(void)
{
    logf("audio_finalise_track_change");

    if (automatic_skip)
    {
        if (!auto_dir_skip)
            playlist_next(-wps_offset);

        wps_offset = 0;
        automatic_skip = false;
    }

    auto_dir_skip = false;

    /* Invalidate prevtrack_id3 */
    prevtrack_id3.path[0] = 0;

    if (prev_ti && prev_ti->audio_hid < 0)
    {
        /* No audio left so we clear all the track info. */
        clear_track_info(prev_ti);
    }

    if (prev_ti && prev_ti->id3_hid >= 0)
    {
        /* Reset the elapsed time to force the progressbar to be empty if
           the user skips back to this track */
        bufgetid3(prev_ti->id3_hid)->elapsed = 0;
    }

    send_event(PLAYBACK_EVENT_TRACK_CHANGE, &curtrack_id3);

    track_changed = true;
    playlist_update_resume_info(audio_current_track());
}

/*
 * Layout audio buffer as follows - iram buffer depends on target:
 * [|SWAP:iram][|TALK]|MALLOC|FILE|GUARD|PCM|[SWAP:dram[|iram]|]
 */
static void audio_reset_buffer(void)
{
    /* see audio_get_recording_buffer if this is modified */
    logf("audio_reset_buffer");

    /* If the setup of anything allocated before the file buffer is
       changed, do check the adjustments after the buffer_alloc call
       as it will likely be affected and need sliding over */

    /* Initially set up file buffer as all space available */
    malloc_buf = audiobuf + talk_get_bufsize();
    /* Align the malloc buf to line size. Especially important to cf
       targets that do line reads/writes. */
    malloc_buf = (unsigned char *)(((uintptr_t)malloc_buf + 15) & ~15);
    filebuf    = malloc_buf + MALLOC_BUFSIZE; /* filebuf line align implied */
    filebuflen = audiobufend - filebuf;

    filebuflen &= ~15;

    /* Subtract whatever the pcm buffer says it used plus the guard buffer */
    filebuflen -= pcmbuf_init(filebuf + filebuflen) + GUARD_BUFSIZE;

    /* Make sure filebuflen is a longword multiple after adjustment - filebuf
       will already be line aligned */
    filebuflen &= ~3;

    buffering_reset(filebuf, filebuflen);

    /* Clear any references to the file buffer */
    buffer_state = BUFFER_STATE_INITIALIZED;

#if defined(ROCKBOX_HAS_LOGF) && defined(LOGF_ENABLE)
    /* Make sure everything adds up - yes, some info is a bit redundant but
       aids viewing and the sumation of certain variables should add up to
       the location of others. */
    {
        size_t pcmbufsize;
        const unsigned char *pcmbuf = pcmbuf_get_meminfo(&pcmbufsize);
        logf("mabuf:  %08X", (unsigned)malloc_buf);
        logf("mabufe: %08X", (unsigned)(malloc_buf + MALLOC_BUFSIZE));
        logf("fbuf:   %08X", (unsigned)filebuf);
        logf("fbufe:  %08X", (unsigned)(filebuf + filebuflen));
        logf("gbuf:   %08X", (unsigned)(filebuf + filebuflen));
        logf("gbufe:  %08X", (unsigned)(filebuf + filebuflen + GUARD_BUFSIZE));
        logf("pcmb:   %08X", (unsigned)pcmbuf);
        logf("pcmbe:  %08X", (unsigned)(pcmbuf + pcmbufsize));
    }
#endif
}

static void audio_thread(void)
{
    struct queue_event ev;

    pcm_postinit();

    audio_thread_ready = true;

    while (1)
    {
        cancel_cpu_boost();
        if (!pcmbuf_queue_scan(&ev))
            queue_wait_w_tmo(&audio_queue, &ev, HZ/2);

        switch (ev.id) {
            case Q_AUDIO_FILL_BUFFER:
                LOGFQUEUE("audio < Q_AUDIO_FILL_BUFFER");
                if (!playing || playlist_end || ci.stop_codec)
                    break;
                audio_fill_file_buffer(false, 0);
                break;

            case Q_AUDIO_PLAY:
                LOGFQUEUE("audio < Q_AUDIO_PLAY");
                if (playing && ev.data <= 0)
                    audio_new_playlist();
                else
                {
                    audio_stop_playback();
                    audio_play_start((size_t)ev.data);
                }
                break;

            case Q_AUDIO_STOP:
                LOGFQUEUE("audio < Q_AUDIO_STOP");
                if (playing)
                    audio_stop_playback();
                if (ev.data != 0)
                    queue_clear(&audio_queue);
                break;

            case Q_AUDIO_PAUSE:
                LOGFQUEUE("audio < Q_AUDIO_PAUSE");
                if (!(bool) ev.data && skipped_during_pause && !pcmbuf_is_crossfade_active())
                    pcmbuf_play_stop(); /* Flush old track on resume after skip */
                skipped_during_pause = false;
                if (!playing)
                    break;
                pcmbuf_pause((bool)ev.data);
                paused = (bool)ev.data;
                break;

            case Q_AUDIO_SKIP:
                LOGFQUEUE("audio < Q_AUDIO_SKIP");
                audio_initiate_track_change((long)ev.data);
                break;

            case Q_AUDIO_PRE_FF_REWIND:
                LOGFQUEUE("audio < Q_AUDIO_PRE_FF_REWIND");
                if (!playing)
                    break;
                pcmbuf_pause(true);
                break;

            case Q_AUDIO_FF_REWIND:
                LOGFQUEUE("audio < Q_AUDIO_FF_REWIND");
                if (!playing)
                    break;
                if (automatic_skip)
                {
                    /* An automatic track skip is in progress. Finalize it,
                       then go back to the previous track */
                    audio_finalise_track_change();
                    ci.new_track = -1;
                }
                ci.seek_time = (long)ev.data+1;
                break;

            case Q_AUDIO_CHECK_NEW_TRACK:
                LOGFQUEUE("audio < Q_AUDIO_CHECK_NEW_TRACK");
                queue_reply(&audio_queue, audio_check_new_track());
                break;

            case Q_AUDIO_DIR_SKIP:
                LOGFQUEUE("audio < Q_AUDIO_DIR_SKIP");
                playlist_end = false;
                audio_initiate_dir_change(ev.data);
                break;

            case Q_AUDIO_FLUSH:
                LOGFQUEUE("audio < Q_AUDIO_FLUSH");
                audio_invalidate_tracks();
                break;

            case Q_AUDIO_TRACK_CHANGED:
                /* PCM track change done */
                LOGFQUEUE("audio < Q_AUDIO_TRACK_CHANGED");
                audio_finalise_track_change();
                break;

#ifndef SIMULATOR
            case SYS_USB_CONNECTED:
                LOGFQUEUE("audio < SYS_USB_CONNECTED");
                if (playing)
                    audio_stop_playback();
#ifdef PLAYBACK_VOICE
                voice_stop();
#endif
                usb_acknowledge(SYS_USB_CONNECTED_ACK);
                usb_wait_for_disconnect(&audio_queue);

                /* Mark all entries null. */
                audio_clear_track_entries();

                /* release tracks to make sure all handles are closed */
                audio_release_tracks();
                break;
#endif

            case SYS_TIMEOUT:
                LOGFQUEUE_SYS_TIMEOUT("audio < SYS_TIMEOUT");
                break;

            default:
                LOGFQUEUE("audio < default");
                break;
        } /* end switch */
    } /* end while */
}

/* Initialize the audio system - called from init() in main.c.
 * Last function because of all the references to internal symbols
 */
void audio_init(void)
{
    struct thread_entry *audio_thread_p;

    /* Can never do this twice */
    if (audio_is_initialized)
    {
        logf("audio: already initialized");
        return;
    }

    logf("audio: initializing");

    /* Initialize queues before giving control elsewhere in case it likes
       to send messages. Thread creation will be delayed however so nothing
       starts running until ready if something yields such as talk_init. */
    queue_init(&audio_queue, true);
    queue_init(&codec_queue, false);
    queue_init(&pcmbuf_queue, false);

    pcm_init();

     /* Initialize codec api. */
    ci.read_filebuf        = codec_filebuf_callback;
    ci.pcmbuf_insert       = codec_pcmbuf_insert_callback;
    ci.get_codec_memory    = codec_get_memory_callback;
    ci.request_buffer      = codec_request_buffer_callback;
    ci.advance_buffer      = codec_advance_buffer_callback;
    ci.advance_buffer_loc  = codec_advance_buffer_loc_callback;
    ci.request_next_track  = codec_request_next_track_callback;
    ci.mp3_get_filepos     = codec_mp3_get_filepos_callback;
    ci.seek_buffer         = codec_seek_buffer_callback;
    ci.seek_complete       = codec_seek_complete_callback;
    ci.set_elapsed         = codec_set_elapsed_callback;
    ci.set_offset          = codec_set_offset_callback;
    ci.configure           = codec_configure_callback;
    ci.discard_codec       = codec_discard_codec_callback;
    ci.dsp                 = (struct dsp_config *)dsp_configure(NULL, DSP_MYDSP,
                                                                CODEC_IDX_AUDIO);

    /* initialize the buffer */
    filebuf = audiobuf;

    /* audio_reset_buffer must to know the size of voice buffer so init
       talk first */
    talk_init();

    codec_thread_p = create_thread(
            codec_thread, codec_stack, sizeof(codec_stack),
            CREATE_THREAD_FROZEN,
            codec_thread_name IF_PRIO(, PRIORITY_PLAYBACK)
            IF_COP(, CPU));

    queue_enable_queue_send(&codec_queue, &codec_queue_sender_list,
                            codec_thread_p);

    audio_thread_p = create_thread(audio_thread, audio_stack,
                  sizeof(audio_stack), CREATE_THREAD_FROZEN,
                  audio_thread_name IF_PRIO(, PRIORITY_USER_INTERFACE)
                  IF_COP(, CPU));

    queue_enable_queue_send(&audio_queue, &audio_queue_sender_list,
                            audio_thread_p);

#ifdef PLAYBACK_VOICE
    voice_thread_init();
#endif

    /* Set crossfade setting for next buffer init which should be about... */
    pcmbuf_crossfade_enable(global_settings.crossfade);

    /* initialize the buffering system */

    buffering_init();
    /* ...now! Set up the buffers */
    audio_reset_buffer();

    int i;
    for(i = 0; i < MAX_TRACK; i++)
    {
        tracks[i].audio_hid = -1;
        tracks[i].id3_hid = -1;
        tracks[i].codec_hid = -1;
#ifdef HAVE_ALBUMART
        tracks[i].aa_hid = -1;
#endif
    }

    /* Probably safe to say */
    audio_is_initialized = true;

    sound_settings_apply();
#ifndef HAVE_FLASH_STORAGE
    audio_set_buffer_margin(global_settings.buffer_margin);
#endif

    /* it's safe to let the threads run now */
#ifdef PLAYBACK_VOICE
    voice_thread_resume();
#endif
    thread_thaw(codec_thread_p);
    thread_thaw(audio_thread_p);

} /* audio_init */

void audio_wait_for_init(void)
{
    /* audio thread will only set this once after it finished the final
     * audio hardware init so this little construct is safe - even
     * cross-core. */
    while (!audio_thread_ready)
    {
        sleep(0);
    }
}