summaryrefslogtreecommitdiff
path: root/include/FLAC/stream_encoder.h
blob: dbbbb23ee113031452f1f515bdb8db54c245dba8 (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
/* libFLAC - Free Lossless Audio Codec library
 * Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007  Josh Coalson
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of the Xiph.org Foundation nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef FLAC__STREAM_ENCODER_H
#define FLAC__STREAM_ENCODER_H

#include <stdio.h> /* for FILE */
#include "export.h"
#include "format.h"
#include "stream_decoder.h"

#ifdef __cplusplus
extern "C" {
#endif


/** \file include/FLAC/stream_encoder.h
 *
 *  \brief
 *  This module contains the functions which implement the stream
 *  encoder.
 *
 *  See the detailed documentation in the
 *  \link flac_stream_encoder stream encoder \endlink module.
 */

/** \defgroup flac_encoder FLAC/ \*_encoder.h: encoder interfaces
 *  \ingroup flac
 *
 *  \brief
 *  This module describes the encoder layers provided by libFLAC.
 *
 * The stream encoder can be used to encode complete streams either to the
 * client via callbacks, or directly to a file, depending on how it is
 * initialized.  When encoding via callbacks, the client provides a write
 * callback which will be called whenever FLAC data is ready to be written.
 * If the client also supplies a seek callback, the encoder will also
 * automatically handle the writing back of metadata discovered while
 * encoding, like stream info, seek points offsets, etc.  When encoding to
 * a file, the client needs only supply a filename or open \c FILE* and an
 * optional progress callback for periodic notification of progress; the
 * write and seek callbacks are supplied internally.  For more info see the
 * \link flac_stream_encoder stream encoder \endlink module.
 */

/** \defgroup flac_stream_encoder FLAC/stream_encoder.h: stream encoder interface
 *  \ingroup flac_encoder
 *
 *  \brief
 *  This module contains the functions which implement the stream
 *  encoder.
 *
 * The stream encoder can encode to native FLAC, and optionally Ogg FLAC
 * (check FLAC_API_SUPPORTS_OGG_FLAC) streams and files.
 *
 * The basic usage of this encoder is as follows:
 * - The program creates an instance of an encoder using
 *   FLAC__stream_encoder_new().
 * - The program overrides the default settings using
 *   FLAC__stream_encoder_set_*() functions.  At a minimum, the following
 *   functions should be called:
 *   - FLAC__stream_encoder_set_channels()
 *   - FLAC__stream_encoder_set_bits_per_sample()
 *   - FLAC__stream_encoder_set_sample_rate()
 *   - FLAC__stream_encoder_set_ogg_serial_number() (if encoding to Ogg FLAC)
 *   - FLAC__stream_encoder_set_total_samples_estimate() (if known)
 * - If the application wants to control the compression level or set its own
 *   metadata, then the following should also be called:
 *   - FLAC__stream_encoder_set_compression_level()
 *   - FLAC__stream_encoder_set_verify()
 *   - FLAC__stream_encoder_set_metadata()
 * - The rest of the set functions should only be called if the client needs
 *   exact control over how the audio is compressed; thorough understanding
 *   of the FLAC format is necessary to achieve good results.
 * - The program initializes the instance to validate the settings and
 *   prepare for encoding using
 *   - FLAC__stream_encoder_init_stream() or FLAC__stream_encoder_init_FILE()
 *     or FLAC__stream_encoder_init_file() for native FLAC
 *   - FLAC__stream_encoder_init_ogg_stream() or FLAC__stream_encoder_init_ogg_FILE()
 *     or FLAC__stream_encoder_init_ogg_file() for Ogg FLAC
 * - The program calls FLAC__stream_encoder_process() or
 *   FLAC__stream_encoder_process_interleaved() to encode data, which
 *   subsequently calls the callbacks when there is encoder data ready
 *   to be written.
 * - The program finishes the encoding with FLAC__stream_encoder_finish(),
 *   which causes the encoder to encode any data still in its input pipe,
 *   update the metadata with the final encoding statistics if output
 *   seeking is possible, and finally reset the encoder to the
 *   uninitialized state.
 * - The instance may be used again or deleted with
 *   FLAC__stream_encoder_delete().
 *
 * In more detail, the stream encoder functions similarly to the
 * \link flac_stream_decoder stream decoder \endlink, but has fewer
 * callbacks and more options.  Typically the client will create a new
 * instance by calling FLAC__stream_encoder_new(), then set the necessary
 * parameters with FLAC__stream_encoder_set_*(), and initialize it by
 * calling one of the FLAC__stream_encoder_init_*() functions.
 *
 * Unlike the decoders, the stream encoder has many options that can
 * affect the speed and compression ratio.  When setting these parameters
 * you should have some basic knowledge of the format (see the
 * <A HREF="../documentation.html#format">user-level documentation</A>
 * or the <A HREF="../format.html">formal description</A>).  The
 * FLAC__stream_encoder_set_*() functions themselves do not validate the
 * values as many are interdependent.  The FLAC__stream_encoder_init_*()
 * functions will do this, so make sure to pay attention to the state
 * returned by FLAC__stream_encoder_init_*() to make sure that it is
 * FLAC__STREAM_ENCODER_INIT_STATUS_OK.  Any parameters that are not set
 * before FLAC__stream_encoder_init_*() will take on the defaults from
 * the constructor.
 *
 * There are three initialization functions for native FLAC, one for
 * setting up the encoder to encode FLAC data to the client via
 * callbacks, and two for encoding directly to a file.
 *
 * For encoding via callbacks, use FLAC__stream_encoder_init_stream().
 * You must also supply a write callback which will be called anytime
 * there is raw encoded data to write.  If the client can seek the output
 * it is best to also supply seek and tell callbacks, as this allows the
 * encoder to go back after encoding is finished to write back
 * information that was collected while encoding, like seek point offsets,
 * frame sizes, etc.
 *
 * For encoding directly to a file, use FLAC__stream_encoder_init_FILE()
 * or FLAC__stream_encoder_init_file().  Then you must only supply a
 * filename or open \c FILE*; the encoder will handle all the callbacks
 * internally.  You may also supply a progress callback for periodic
 * notification of the encoding progress.
 *
 * There are three similarly-named init functions for encoding to Ogg
 * FLAC streams.  Check \c FLAC_API_SUPPORTS_OGG_FLAC to find out if the
 * library has been built with Ogg support.
 *
 * The call to FLAC__stream_encoder_init_*() currently will also immediately
 * call the write callback several times, once with the \c fLaC signature,
 * and once for each encoded metadata block.  Note that for Ogg FLAC
 * encoding you will usually get at least twice the number of callbacks than
 * with native FLAC, one for the Ogg page header and one for the page body.
 *
 * After initializing the instance, the client may feed audio data to the
 * encoder in one of two ways:
 *
 * - Channel separate, through FLAC__stream_encoder_process() - The client
 *   will pass an array of pointers to buffers, one for each channel, to
 *   the encoder, each of the same length.  The samples need not be
 *   block-aligned, but each channel should have the same number of samples.
 * - Channel interleaved, through
 *   FLAC__stream_encoder_process_interleaved() - The client will pass a single
 *   pointer to data that is channel-interleaved (i.e. channel0_sample0,
 *   channel1_sample0, ... , channelN_sample0, channel0_sample1, ...).
 *   Again, the samples need not be block-aligned but they must be
 *   sample-aligned, i.e. the first value should be channel0_sample0 and
 *   the last value channelN_sampleM.
 *
 * Note that for either process call, each sample in the buffers should be a
 * signed integer, right-justified to the resolution set by
 * FLAC__stream_encoder_set_bits_per_sample().  For example, if the resolution
 * is 16 bits per sample, the samples should all be in the range [-32768,32767].
 *
 * When the client is finished encoding data, it calls
 * FLAC__stream_encoder_finish(), which causes the encoder to encode any
 * data still in its input pipe, and call the metadata callback with the
 * final encoding statistics.  Then the instance may be deleted with
 * FLAC__stream_encoder_delete() or initialized again to encode another
 * stream.
 *
 * For programs that write their own metadata, but that do not know the
 * actual metadata until after encoding, it is advantageous to instruct
 * the encoder to write a PADDING block of the correct size, so that
 * instead of rewriting the whole stream after encoding, the program can
 * just overwrite the PADDING block.  If only the maximum size of the
 * metadata is known, the program can write a slightly larger padding
 * block, then split it after encoding.
 *
 * Make sure you understand how lengths are calculated.  All FLAC metadata
 * blocks have a 4 byte header which contains the type and length.  This
 * length does not include the 4 bytes of the header.  See the format page
 * for the specification of metadata blocks and their lengths.
 *
 * \note
 * If you are writing the FLAC data to a file via callbacks, make sure it
 * is open for update (e.g. mode "w+" for stdio streams).  This is because
 * after the first encoding pass, the encoder will try to seek back to the
 * beginning of the stream, to the STREAMINFO block, to write some data
 * there.  (If using FLAC__stream_encoder_init*_file() or
 * FLAC__stream_encoder_init*_FILE(), the file is managed internally.)
 *
 * \note
 * The "set" functions may only be called when the encoder is in the
 * state FLAC__STREAM_ENCODER_UNINITIALIZED, i.e. after
 * FLAC__stream_encoder_new() or FLAC__stream_encoder_finish(), but
 * before FLAC__stream_encoder_init_*().  If this is the case they will
 * return \c true, otherwise \c false.
 *
 * \note
 * FLAC__stream_encoder_finish() resets all settings to the constructor
 * defaults.
 *
 * \{
 */


/** State values for a FLAC__StreamEncoder.
 *
 * The encoder's state can be obtained by calling FLAC__stream_encoder_get_state().
 *
 * If the encoder gets into any other state besides \c FLAC__STREAM_ENCODER_OK
 * or \c FLAC__STREAM_ENCODER_UNINITIALIZED, it becomes invalid for encoding and
 * must be deleted with FLAC__stream_encoder_delete().
 */
typedef enum {

	FLAC__STREAM_ENCODER_OK = 0,
	/**< The encoder is in the normal OK state and samples can be processed. */

	FLAC__STREAM_ENCODER_UNINITIALIZED,
	/**< The encoder is in the uninitialized state; one of the
	 * FLAC__stream_encoder_init_*() functions must be called before samples
	 * can be processed.
	 */

	FLAC__STREAM_ENCODER_OGG_ERROR,
	/**< An error occurred in the underlying Ogg layer.  */

	FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR,
	/**< An error occurred in the underlying verify stream decoder;
	 * check FLAC__stream_encoder_get_verify_decoder_state().
	 */

	FLAC__STREAM_ENCODER_VERIFY_MISMATCH_IN_AUDIO_DATA,
	/**< The verify decoder detected a mismatch between the original
	 * audio signal and the decoded audio signal.
	 */

	FLAC__STREAM_ENCODER_CLIENT_ERROR,
	/**< One of the callbacks returned a fatal error. */

	FLAC__STREAM_ENCODER_IO_ERROR,
	/**< An I/O error occurred while opening/reading/writing a file.
	 * Check \c errno.
	 */

	FLAC__STREAM_ENCODER_FRAMING_ERROR,
	/**< An error occurred while writing the stream; usually, the
	 * write_callback returned an error.
	 */

	FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR
	/**< Memory allocation failed. */

} FLAC__StreamEncoderState;

/** Maps a FLAC__StreamEncoderState to a C string.
 *
 *  Using a FLAC__StreamEncoderState as the index to this array
 *  will give the string equivalent.  The contents should not be modified.
 */
extern FLAC_API const char * const FLAC__StreamEncoderStateString[];


/** Possible return values for the FLAC__stream_encoder_init_*() functions.
 */
typedef enum {

	FLAC__STREAM_ENCODER_INIT_STATUS_OK = 0,
	/**< Initialization was successful. */

	FLAC__STREAM_ENCODER_INIT_STATUS_ENCODER_ERROR,
	/**< General failure to set up encoder; call FLAC__stream_encoder_get_state() for cause. */

	FLAC__STREAM_ENCODER_INIT_STATUS_UNSUPPORTED_CONTAINER,
	/**< The library was not compiled with support for the given container
	 * format.
	 */

	FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_CALLBACKS,
	/**< A required callback was not supplied. */

	FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_NUMBER_OF_CHANNELS,
	/**< The encoder has an invalid setting for number of channels. */

	FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BITS_PER_SAMPLE,
	/**< The encoder has an invalid setting for bits-per-sample.
	 * FLAC supports 4-32 bps but the reference encoder currently supports
	 * only up to 24 bps.
	 */

	FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_SAMPLE_RATE,
	/**< The encoder has an invalid setting for the input sample rate. */

	FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_BLOCK_SIZE,
	/**< The encoder has an invalid setting for the block size. */

	FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_MAX_LPC_ORDER,
	/**< The encoder has an invalid setting for the maximum LPC order. */

	FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_QLP_COEFF_PRECISION,
	/**< The encoder has an invalid setting for the precision of the quantized linear predictor coefficients. */

	FLAC__STREAM_ENCODER_INIT_STATUS_BLOCK_SIZE_TOO_SMALL_FOR_LPC_ORDER,
	/**< The specified block size is less than the maximum LPC order. */

	FLAC__STREAM_ENCODER_INIT_STATUS_NOT_STREAMABLE,
	/**< The encoder is bound to the <A HREF="../format.html#subset">Subset</A> but other settings violate it. */

	FLAC__STREAM_ENCODER_INIT_STATUS_INVALID_METADATA,
	/**< The metadata input to the encoder is invalid, in one of the following ways:
	 * - FLAC__stream_encoder_set_metadata() was called with a null pointer but a block count > 0
	 * - One of the metadata blocks contains an undefined type
	 * - It contains an illegal CUESHEET as checked by FLAC__format_cuesheet_is_legal()
	 * - It contains an illegal SEEKTABLE as checked by FLAC__format_seektable_is_legal()
	 * - It contains more than one SEEKTABLE block or more than one VORBIS_COMMENT block
	 */

	FLAC__STREAM_ENCODER_INIT_STATUS_ALREADY_INITIALIZED
	/**< FLAC__stream_encoder_init_*() was called when the encoder was
	 * already initialized, usually because
	 * FLAC__stream_encoder_finish() was not called.
	 */

} FLAC__StreamEncoderInitStatus;

/** Maps a FLAC__StreamEncoderInitStatus to a C string.
 *
 *  Using a FLAC__StreamEncoderInitStatus as the index to this array
 *  will give the string equivalent.  The contents should not be modified.
 */
extern FLAC_API const char * const FLAC__StreamEncoderInitStatusString[];


/** Return values for the FLAC__StreamEncoder read callback.
 */
typedef enum {

	FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE,
	/**< The read was OK and decoding can continue. */

	FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM,
	/**< The read was attempted at the end of the stream. */

	FLAC__STREAM_ENCODER_READ_STATUS_ABORT,
	/**< An unrecoverable error occurred. */

	FLAC__STREAM_ENCODER_READ_STATUS_UNSUPPORTED
	/**< Client does not support reading back from the output. */

} FLAC__StreamEncoderReadStatus;

/** Maps a FLAC__StreamEncoderReadStatus to a C string.
 *
 *  Using a FLAC__StreamEncoderReadStatus as the index to this array
 *  will give the string equivalent.  The contents should not be modified.
 */
extern FLAC_API const char * const FLAC__StreamEncoderReadStatusString[];


/** Return values for the FLAC__StreamEncoder write callback.
 */
typedef enum {

	FLAC__STREAM_ENCODER_WRITE_STATUS_OK = 0,
	/**< The write was OK and encoding can continue. */

	FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR
	/**< An unrecoverable error occurred.  The encoder will return from the process call. */

} FLAC__StreamEncoderWriteStatus;

/** Maps a FLAC__StreamEncoderWriteStatus to a C string.
 *
 *  Using a FLAC__StreamEncoderWriteStatus as the index to this array
 *  will give the string equivalent.  The contents should not be modified.
 */
extern FLAC_API const char * const FLAC__StreamEncoderWriteStatusString[];


/** Return values for the FLAC__StreamEncoder seek callback.
 */
typedef enum {

	FLAC__STREAM_ENCODER_SEEK_STATUS_OK,
	/**< The seek was OK and encoding can continue. */

	FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR,
	/**< An unrecoverable error occurred. */

	FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED
	/**< Client does not support seeking. */

} FLAC__StreamEncoderSeekStatus;

/** Maps a FLAC__StreamEncoderSeekStatus to a C string.
 *
 *  Using a FLAC__StreamEncoderSeekStatus as the index to this array
 *  will give the string equivalent.  The contents should not be modified.
 */
extern FLAC_API const char * const FLAC__StreamEncoderSeekStatusString[];


/** Return values for the FLAC__StreamEncoder tell callback.
 */
typedef enum {

	FLAC__STREAM_ENCODER_TELL_STATUS_OK,
	/**< The tell was OK and encoding can continue. */

	FLAC__STREAM_ENCODER_TELL_STATUS_ERROR,
	/**< An unrecoverable error occurred. */

	FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED
	/**< Client does not support seeking. */

} FLAC__StreamEncoderTellStatus;

/** Maps a FLAC__StreamEncoderTellStatus to a C string.
 *
 *  Using a FLAC__StreamEncoderTellStatus as the index to this array
 *  will give the string equivalent.  The contents should not be modified.
 */
extern FLAC_API const char * const FLAC__StreamEncoderTellStatusString[];


/***********************************************************************
 *
 * class FLAC__StreamEncoder
 *
 ***********************************************************************/

struct FLAC__StreamEncoderProtected;
struct FLAC__StreamEncoderPrivate;
/** The opaque structure definition for the stream encoder type.
 *  See the \link flac_stream_encoder stream encoder module \endlink
 *  for a detailed description.
 */
typedef struct {
	struct FLAC__StreamEncoderProtected *protected_; /* avoid the C++ keyword 'protected' */
	struct FLAC__StreamEncoderPrivate *private_; /* avoid the C++ keyword 'private' */
} FLAC__StreamEncoder;

/** Signature for the read callback.
 *
 *  A function pointer matching this signature must be passed to
 *  FLAC__stream_encoder_init_ogg_stream() if seeking is supported.
 *  The supplied function will be called when the encoder needs to read back
 *  encoded data.  This happens during the metadata callback, when the encoder
 *  has to read, modify, and rewrite the metadata (e.g. seekpoints) gathered
 *  while encoding.  The address of the buffer to be filled is supplied, along
 *  with the number of bytes the buffer can hold.  The callback may choose to
 *  supply less data and modify the byte count but must be careful not to
 *  overflow the buffer.  The callback then returns a status code chosen from
 *  FLAC__StreamEncoderReadStatus.
 *
 * Here is an example of a read callback for stdio streams:
 * \code
 * FLAC__StreamEncoderReadStatus read_cb(const FLAC__StreamEncoder *encoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
 * {
 *   FILE *file = ((MyClientData*)client_data)->file;
 *   if(*bytes > 0) {
 *     *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, file);
 *     if(ferror(file))
 *       return FLAC__STREAM_ENCODER_READ_STATUS_ABORT;
 *     else if(*bytes == 0)
 *       return FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM;
 *     else
 *       return FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE;
 *   }
 *   else
 *     return FLAC__STREAM_ENCODER_READ_STATUS_ABORT;
 * }
 * \endcode
 *
 * \note In general, FLAC__StreamEncoder functions which change the
 * state should not be called on the \a encoder while in the callback.
 *
 * \param  encoder  The encoder instance calling the callback.
 * \param  buffer   A pointer to a location for the callee to store
 *                  data to be encoded.
 * \param  bytes    A pointer to the size of the buffer.  On entry
 *                  to the callback, it contains the maximum number
 *                  of bytes that may be stored in \a buffer.  The
 *                  callee must set it to the actual number of bytes
 *                  stored (0 in case of error or end-of-stream) before
 *                  returning.
 * \param  client_data  The callee's client data set through
 *                      FLAC__stream_encoder_set_client_data().
 * \retval FLAC__StreamEncoderReadStatus
 *    The callee's return status.
 */
typedef FLAC__StreamEncoderReadStatus (*FLAC__StreamEncoderReadCallback)(const FLAC__StreamEncoder *encoder, FLAC__byte buffer[], size_t *bytes, void *client_data);

/** Signature for the write callback.
 *
 *  A function pointer matching this signature must be passed to
 *  FLAC__stream_encoder_init*_stream().  The supplied function will be called
 *  by the encoder anytime there is raw encoded data ready to write.  It may
 *  include metadata mixed with encoded audio frames and the data is not
 *  guaranteed to be aligned on frame or metadata block boundaries.
 *
 *  The only duty of the callback is to write out the \a bytes worth of data
 *  in \a buffer to the current position in the output stream.  The arguments
 *  \a samples and \a current_frame are purely informational.  If \a samples
 *  is greater than \c 0, then \a current_frame will hold the current frame
 *  number that is being written; otherwise it indicates that the write
 *  callback is being called to write metadata.
 *
 * \note
 * Unlike when writing to native FLAC, when writing to Ogg FLAC the
 * write callback will be called twice when writing each audio
 * frame; once for the page header, and once for the page body.
 * When writing the page header, the \a samples argument to the
 * write callback will be \c 0.
 *
 * \note In general, FLAC__StreamEncoder functions which change the
 * state should not be called on the \a encoder while in the callback.
 *
 * \param  encoder  The encoder instance calling the callback.
 * \param  buffer   An array of encoded data of length \a bytes.
 * \param  bytes    The byte length of \a buffer.
 * \param  samples  The number of samples encoded by \a buffer.
 *                  \c 0 has a special meaning; see above.
 * \param  current_frame  The number of the current frame being encoded.
 * \param  client_data  The callee's client data set through
 *                      FLAC__stream_encoder_init_*().
 * \retval FLAC__StreamEncoderWriteStatus
 *    The callee's return status.
 */
typedef FLAC__StreamEncoderWriteStatus (*FLAC__StreamEncoderWriteCallback)(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, void *client_data);

/** Signature for the seek callback.
 *
 *  A function pointer matching this signature may be passed to
 *  FLAC__stream_encoder_init*_stream().  The supplied function will be called
 *  when the encoder needs to seek the output stream.  The encoder will pass
 *  the absolute byte offset to seek to, 0 meaning the beginning of the stream.
 *
 * Here is an example of a seek callback for stdio streams:
 * \code
 * FLAC__StreamEncoderSeekStatus seek_cb(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data)
 * {
 *   FILE *file = ((MyClientData*)client_data)->file;
 *   if(file == stdin)
 *     return FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED;
 *   else if(fseeko(file, (off_t)absolute_byte_offset, SEEK_SET) < 0)
 *     return FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR;
 *   else
 *     return FLAC__STREAM_ENCODER_SEEK_STATUS_OK;
 * }
 * \endcode
 *
 * \note In general, FLAC__StreamEncoder functions which change the
 * state should not be called on the \a encoder while in the callback.
 *
 * \param  encoder  The encoder instance calling the callback.
 * \param  absolute_byte_offset  The offset from the beginning of the stream
 *                               to seek to.
 * \param  client_data  The callee's client data set through
 *                      FLAC__stream_encoder_init_*().
 * \retval FLAC__StreamEncoderSeekStatus
 *    The callee's return status.
 */
typedef FLAC__StreamEncoderSeekStatus (*FLAC__StreamEncoderSeekCallback)(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data);

/** Signature for the tell callback.
 *
 *  A function pointer matching this signature may be passed to
 *  FLAC__stream_encoder_init*_stream().  The supplied function will be called
 *  when the encoder needs to know the current position of the output stream.
 *
 * \warning
 * The callback must return the true current byte offset of the output to
 * which the encoder is writing.  If you are buffering the output, make
 * sure and take this into account.  If you are writing directly to a
 * FILE* from your write callback, ftell() is sufficient.  If you are
 * writing directly to a file descriptor from your write callback, you
 * can use lseek(fd, SEEK_CUR, 0).  The encoder may later seek back to
 * these points to rewrite metadata after encoding.
 *
 * Here is an example of a tell callback for stdio streams:
 * \code
 * FLAC__StreamEncoderTellStatus tell_cb(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
 * {
 *   FILE *file = ((MyClientData*)client_data)->file;
 *   off_t pos;
 *   if(file == stdin)
 *     return FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED;
 *   else if((pos = ftello(file)) < 0)
 *     return FLAC__STREAM_ENCODER_TELL_STATUS_ERROR;
 *   else {
 *     *absolute_byte_offset = (FLAC__uint64)pos;
 *     return FLAC__STREAM_ENCODER_TELL_STATUS_OK;
 *   }
 * }
 * \endcode
 *
 * \note In general, FLAC__StreamEncoder functions which change the
 * state should not be called on the \a encoder while in the callback.
 *
 * \param  encoder  The encoder instance calling the callback.
 * \param  absolute_byte_offset  The address at which to store the current
 *                               position of the output.
 * \param  client_data  The callee's client data set through
 *                      FLAC__stream_encoder_init_*().
 * \retval FLAC__StreamEncoderTellStatus
 *    The callee's return status.
 */
typedef FLAC__StreamEncoderTellStatus (*FLAC__StreamEncoderTellCallback)(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data);

/** Signature for the metadata callback.
 *
 *  A function pointer matching this signature may be passed to
 *  FLAC__stream_encoder_init*_stream().  The supplied function will be called
 *  once at the end of encoding with the populated STREAMINFO structure.  This
 *  is so the client can seek back to the beginning of the file and write the
 *  STREAMINFO block with the correct statistics after encoding (like
 *  minimum/maximum frame size and total samples).
 *
 * \note In general, FLAC__StreamEncoder functions which change the
 * state should not be called on the \a encoder while in the callback.
 *
 * \param  encoder      The encoder instance calling the callback.
 * \param  metadata     The final populated STREAMINFO block.
 * \param  client_data  The callee's client data set through
 *                      FLAC__stream_encoder_init_*().
 */
typedef void (*FLAC__StreamEncoderMetadataCallback)(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetadata *metadata, void *client_data);

/** Signature for the progress callback.
 *
 *  A function pointer matching this signature may be passed to
 *  FLAC__stream_encoder_init*_file() or FLAC__stream_encoder_init*_FILE().
 *  The supplied function will be called when the encoder has finished
 *  writing a frame.  The \c total_frames_estimate argument to the
 *  callback will be based on the value from
 *  FLAC__stream_encoder_set_total_samples_estimate().
 *
 * \note In general, FLAC__StreamEncoder functions which change the
 * state should not be called on the \a encoder while in the callback.
 *
 * \param  encoder          The encoder instance calling the callback.
 * \param  bytes_written    Bytes written so far.
 * \param  samples_written  Samples written so far.
 * \param  frames_written   Frames written so far.
 * \param  total_frames_estimate  The estimate of the total number of
 *                                frames to be written.
 * \param  client_data      The callee's client data set through
 *                          FLAC__stream_encoder_init_*().
 */
typedef void (*FLAC__StreamEncoderProgressCallback)(const FLAC__StreamEncoder *encoder, FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate, void *client_data);


/***********************************************************************
 *
 * Class constructor/destructor
 *
 ***********************************************************************/

/** Create a new stream encoder instance.  The instance is created with
 *  default settings; see the individual FLAC__stream_encoder_set_*()
 *  functions for each setting's default.
 *
 * \retval FLAC__StreamEncoder*
 *    \c NULL if there was an error allocating memory, else the new instance.
 */
FLAC_API FLAC__StreamEncoder *FLAC__stream_encoder_new(void);

/** Free an encoder instance.  Deletes the object pointed to by \a encoder.
 *
 * \param encoder  A pointer to an existing encoder.
 * \assert
 *    \code encoder != NULL \endcode
 */
FLAC_API void FLAC__stream_encoder_delete(FLAC__StreamEncoder *encoder);


/***********************************************************************
 *
 * Public class method prototypes
 *
 ***********************************************************************/

/** Set the serial number for the FLAC stream to use in the Ogg container.
 *
 * \note
 * This does not need to be set for native FLAC encoding.
 *
 * \note
 * It is recommended to set a serial number explicitly as the default of '0'
 * may collide with other streams.
 *
 * \default \c 0
 * \param  encoder        An encoder instance to set.
 * \param  serial_number  See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_ogg_serial_number(FLAC__StreamEncoder *encoder, long serial_number);

/** Set the "verify" flag.  If \c true, the encoder will verify it's own
 *  encoded output by feeding it through an internal decoder and comparing
 *  the original signal against the decoded signal.  If a mismatch occurs,
 *  the process call will return \c false.  Note that this will slow the
 *  encoding process by the extra time required for decoding and comparison.
 *
 * \default \c false
 * \param  encoder  An encoder instance to set.
 * \param  value    Flag value (see above).
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_verify(FLAC__StreamEncoder *encoder, FLAC__bool value);

/** Set the <A HREF="../format.html#subset">Subset</A> flag.  If \c true,
 *  the encoder will comply with the Subset and will check the
 *  settings during FLAC__stream_encoder_init_*() to see if all settings
 *  comply.  If \c false, the settings may take advantage of the full
 *  range that the format allows.
 *
 *  Make sure you know what it entails before setting this to \c false.
 *
 * \default \c true
 * \param  encoder  An encoder instance to set.
 * \param  value    Flag value (see above).
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_streamable_subset(FLAC__StreamEncoder *encoder, FLAC__bool value);

/** Set the number of channels to be encoded.
 *
 * \default \c 2
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_channels(FLAC__StreamEncoder *encoder, unsigned value);

/** Set the sample resolution of the input to be encoded.
 *
 * \warning
 * Do not feed the encoder data that is wider than the value you
 * set here or you will generate an invalid stream.
 *
 * \default \c 16
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_bits_per_sample(FLAC__StreamEncoder *encoder, unsigned value);

/** Set the sample rate (in Hz) of the input to be encoded.
 *
 * \default \c 44100
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_sample_rate(FLAC__StreamEncoder *encoder, unsigned value);

/** Set the compression level
 *
 * The compression level is roughly proportional to the amount of effort
 * the encoder expends to compress the file.  A higher level usually
 * means more computation but higher compression.  The default level is
 * suitable for most applications.
 *
 * Currently the levels range from \c 0 (fastest, least compression) to
 * \c 8 (slowest, most compression).  A value larger than \c 8 will be
 * treated as \c 8.
 *
 * This function automatically calls the following other \c _set_
 * functions with appropriate values, so the client does not need to
 * unless it specifically wants to override them:
 * - FLAC__stream_encoder_set_do_mid_side_stereo()
 * - FLAC__stream_encoder_set_loose_mid_side_stereo()
 * - FLAC__stream_encoder_set_apodization()
 * - FLAC__stream_encoder_set_max_lpc_order()
 * - FLAC__stream_encoder_set_qlp_coeff_precision()
 * - FLAC__stream_encoder_set_do_qlp_coeff_prec_search()
 * - FLAC__stream_encoder_set_do_escape_coding()
 * - FLAC__stream_encoder_set_do_exhaustive_model_search()
 * - FLAC__stream_encoder_set_min_residual_partition_order()
 * - FLAC__stream_encoder_set_max_residual_partition_order()
 * - FLAC__stream_encoder_set_rice_parameter_search_dist()
 *
 * The actual values set for each level are:
 * <table>
 * <tr>
 *  <td><b>level</b><td>
 *  <td>do mid-side stereo<td>
 *  <td>loose mid-side stereo<td>
 *  <td>apodization<td>
 *  <td>max lpc order<td>
 *  <td>qlp coeff precision<td>
 *  <td>qlp coeff prec search<td>
 *  <td>escape coding<td>
 *  <td>exhaustive model search<td>
 *  <td>min residual partition order<td>
 *  <td>max residual partition order<td>
 *  <td>rice parameter search dist<td>
 * </tr>
 * <tr>  <td><b>0</b><td>  <td>false<td>  <td>false<td>  <td>tukey(0.5)<td>  <td>0<td>   <td>0<td>  <td>false<td>  <td>false<td>  <td>false<td>  <td>0<td>  <td>3<td>  <td>0<td>  </tr>
 * <tr>  <td><b>1</b><td>  <td>true<td>   <td>true<td>   <td>tukey(0.5)<td>  <td>0<td>   <td>0<td>  <td>false<td>  <td>false<td>  <td>false<td>  <td>0<td>  <td>3<td>  <td>0<td>  </tr>
 * <tr>  <td><b>2</b><td>  <td>true<td>   <td>false<td>  <td>tukey(0.5)<td>  <td>0<td>   <td>0<td>  <td>false<td>  <td>false<td>  <td>false<td>  <td>0<td>  <td>3<td>  <td>0<td>  </tr>
 * <tr>  <td><b>3</b><td>  <td>false<td>  <td>false<td>  <td>tukey(0.5)<td>  <td>6<td>   <td>0<td>  <td>false<td>  <td>false<td>  <td>false<td>  <td>0<td>  <td>4<td>  <td>0<td>  </tr>
 * <tr>  <td><b>4</b><td>  <td>true<td>   <td>true<td>   <td>tukey(0.5)<td>  <td>8<td>   <td>0<td>  <td>false<td>  <td>false<td>  <td>false<td>  <td>0<td>  <td>4<td>  <td>0<td>  </tr>
 * <tr>  <td><b>5</b><td>  <td>true<td>   <td>false<td>  <td>tukey(0.5)<td>  <td>8<td>   <td>0<td>  <td>false<td>  <td>false<td>  <td>false<td>  <td>0<td>  <td>5<td>  <td>0<td>  </tr>
 * <tr>  <td><b>6</b><td>  <td>true<td>   <td>false<td>  <td>tukey(0.5)<td>  <td>8<td>   <td>0<td>  <td>false<td>  <td>false<td>  <td>false<td>  <td>0<td>  <td>6<td>  <td>0<td>  </tr>
 * <tr>  <td><b>7</b><td>  <td>true<td>   <td>false<td>  <td>tukey(0.5)<td>  <td>8<td>   <td>0<td>  <td>false<td>  <td>false<td>  <td>true<td>   <td>0<td>  <td>6<td>  <td>0<td>  </tr>
 * <tr>  <td><b>8</b><td>  <td>true<td>   <td>false<td>  <td>tukey(0.5)<td>  <td>12<td>  <td>0<td>  <td>false<td>  <td>false<td>  <td>true<td>   <td>0<td>  <td>6<td>  <td>0<td>  </tr>
 * </table>
 *
 * \default \c 5
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_compression_level(FLAC__StreamEncoder *encoder, unsigned value);

/** Set the blocksize to use while encoding.
 *
 * The number of samples to use per frame.  Use \c 0 to let the encoder
 * estimate a blocksize; this is usually best.
 *
 * \default \c 0
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_blocksize(FLAC__StreamEncoder *encoder, unsigned value);

/** Set to \c true to enable mid-side encoding on stereo input.  The
 *  number of channels must be 2 for this to have any effect.  Set to
 *  \c false to use only independent channel coding.
 *
 * \default \c false
 * \param  encoder  An encoder instance to set.
 * \param  value    Flag value (see above).
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_do_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value);

/** Set to \c true to enable adaptive switching between mid-side and
 *  left-right encoding on stereo input.  Set to \c false to use
 *  exhaustive searching.  Setting this to \c true requires
 *  FLAC__stream_encoder_set_do_mid_side_stereo() to also be set to
 *  \c true in order to have any effect.
 *
 * \default \c false
 * \param  encoder  An encoder instance to set.
 * \param  value    Flag value (see above).
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_loose_mid_side_stereo(FLAC__StreamEncoder *encoder, FLAC__bool value);

/** Sets the apodization function(s) the encoder will use when windowing
 *  audio data for LPC analysis.
 *
 * The \a specification is a plain ASCII string which specifies exactly
 * which functions to use.  There may be more than one (up to 32),
 * separated by \c ';' characters.  Some functions take one or more
 * comma-separated arguments in parentheses.
 *
 * The available functions are \c bartlett, \c bartlett_hann,
 * \c blackman, \c blackman_harris_4term_92db, \c connes, \c flattop,
 * \c gauss(STDDEV), \c hamming, \c hann, \c kaiser_bessel, \c nuttall,
 * \c rectangle, \c triangle, \c tukey(P), \c welch.
 *
 * For \c gauss(STDDEV), STDDEV specifies the standard deviation
 * (0<STDDEV<=0.5).
 *
 * For \c tukey(P), P specifies the fraction of the window that is
 * tapered (0<=P<=1).  P=0 corresponds to \c rectangle and P=1
 * corresponds to \c hann.
 *
 * Example specifications are \c "blackman" or
 * \c "hann;triangle;tukey(0.5);tukey(0.25);tukey(0.125)"
 *
 * Any function that is specified erroneously is silently dropped.  Up
 * to 32 functions are kept, the rest are dropped.  If the specification
 * is empty the encoder defaults to \c "tukey(0.5)".
 *
 * When more than one function is specified, then for every subframe the
 * encoder will try each of them separately and choose the window that
 * results in the smallest compressed subframe.
 *
 * Note that each function specified causes the encoder to occupy a
 * floating point array in which to store the window.
 *
 * \default \c "tukey(0.5)"
 * \param  encoder        An encoder instance to set.
 * \param  specification  See above.
 * \assert
 *    \code encoder != NULL \endcode
 *    \code specification != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_apodization(FLAC__StreamEncoder *encoder, const char *specification);

/** Set the maximum LPC order, or \c 0 to use only the fixed predictors.
 *
 * \default \c 0
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_max_lpc_order(FLAC__StreamEncoder *encoder, unsigned value);

/** Set the precision, in bits, of the quantized linear predictor
 *  coefficients, or \c 0 to let the encoder select it based on the
 *  blocksize.
 *
 * \note
 * In the current implementation, qlp_coeff_precision + bits_per_sample must
 * be less than 32.
 *
 * \default \c 0
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_qlp_coeff_precision(FLAC__StreamEncoder *encoder, unsigned value);

/** Set to \c false to use only the specified quantized linear predictor
 *  coefficient precision, or \c true to search neighboring precision
 *  values and use the best one.
 *
 * \default \c false
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_do_qlp_coeff_prec_search(FLAC__StreamEncoder *encoder, FLAC__bool value);

/** Deprecated.  Setting this value has no effect.
 *
 * \default \c false
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_do_escape_coding(FLAC__StreamEncoder *encoder, FLAC__bool value);

/** Set to \c false to let the encoder estimate the best model order
 *  based on the residual signal energy, or \c true to force the
 *  encoder to evaluate all order models and select the best.
 *
 * \default \c false
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_do_exhaustive_model_search(FLAC__StreamEncoder *encoder, FLAC__bool value);

/** Set the minimum partition order to search when coding the residual.
 *  This is used in tandem with
 *  FLAC__stream_encoder_set_max_residual_partition_order().
 *
 *  The partition order determines the context size in the residual.
 *  The context size will be approximately <tt>blocksize / (2 ^ order)</tt>.
 *
 *  Set both min and max values to \c 0 to force a single context,
 *  whose Rice parameter is based on the residual signal variance.
 *  Otherwise, set a min and max order, and the encoder will search
 *  all orders, using the mean of each context for its Rice parameter,
 *  and use the best.
 *
 * \default \c 0
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_min_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);

/** Set the maximum partition order to search when coding the residual.
 *  This is used in tandem with
 *  FLAC__stream_encoder_set_min_residual_partition_order().
 *
 *  The partition order determines the context size in the residual.
 *  The context size will be approximately <tt>blocksize / (2 ^ order)</tt>.
 *
 *  Set both min and max values to \c 0 to force a single context,
 *  whose Rice parameter is based on the residual signal variance.
 *  Otherwise, set a min and max order, and the encoder will search
 *  all orders, using the mean of each context for its Rice parameter,
 *  and use the best.
 *
 * \default \c 0
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_max_residual_partition_order(FLAC__StreamEncoder *encoder, unsigned value);

/** Deprecated.  Setting this value has no effect.
 *
 * \default \c 0
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_rice_parameter_search_dist(FLAC__StreamEncoder *encoder, unsigned value);

/** Set an estimate of the total samples that will be encoded.
 *  This is merely an estimate and may be set to \c 0 if unknown.
 *  This value will be written to the STREAMINFO block before encoding,
 *  and can remove the need for the caller to rewrite the value later
 *  if the value is known before encoding.
 *
 * \default \c 0
 * \param  encoder  An encoder instance to set.
 * \param  value    See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_total_samples_estimate(FLAC__StreamEncoder *encoder, FLAC__uint64 value);

/** Set the metadata blocks to be emitted to the stream before encoding.
 *  A value of \c NULL, \c 0 implies no metadata; otherwise, supply an
 *  array of pointers to metadata blocks.  The array is non-const since
 *  the encoder may need to change the \a is_last flag inside them, and
 *  in some cases update seek point offsets.  Otherwise, the encoder will
 *  not modify or free the blocks.  It is up to the caller to free the
 *  metadata blocks after encoding finishes.
 *
 * \note
 * The encoder stores only copies of the pointers in the \a metadata array;
 * the metadata blocks themselves must survive at least until after
 * FLAC__stream_encoder_finish() returns.  Do not free the blocks until then.
 *
 * \note
 * The STREAMINFO block is always written and no STREAMINFO block may
 * occur in the supplied array.
 *
 * \note
 * By default the encoder does not create a SEEKTABLE.  If one is supplied
 * in the \a metadata array, but the client has specified that it does not
 * support seeking, then the SEEKTABLE will be written verbatim.  However
 * by itself this is not very useful as the client will not know the stream
 * offsets for the seekpoints ahead of time.  In order to get a proper
 * seektable the client must support seeking.  See next note.
 *
 * \note
 * SEEKTABLE blocks are handled specially.  Since you will not know
 * the values for the seek point stream offsets, you should pass in
 * a SEEKTABLE 'template', that is, a SEEKTABLE object with the
 * required sample numbers (or placeholder points), with \c 0 for the
 * \a frame_samples and \a stream_offset fields for each point.  If the
 * client has specified that it supports seeking by providing a seek
 * callback to FLAC__stream_encoder_init_stream() or both seek AND read
 * callback to FLAC__stream_encoder_init_ogg_stream() (or by using
 * FLAC__stream_encoder_init*_file() or FLAC__stream_encoder_init*_FILE()),
 * then while it is encoding the encoder will fill the stream offsets in
 * for you and when encoding is finished, it will seek back and write the
 * real values into the SEEKTABLE block in the stream.  There are helper
 * routines for manipulating seektable template blocks; see metadata.h:
 * FLAC__metadata_object_seektable_template_*().  If the client does
 * not support seeking, the SEEKTABLE will have inaccurate offsets which
 * will slow down or remove the ability to seek in the FLAC stream.
 *
 * \note
 * The encoder instance \b will modify the first \c SEEKTABLE block
 * as it transforms the template to a valid seektable while encoding,
 * but it is still up to the caller to free all metadata blocks after
 * encoding.
 *
 * \note
 * A VORBIS_COMMENT block may be supplied.  The vendor string in it
 * will be ignored.  libFLAC will use it's own vendor string. libFLAC
 * will not modify the passed-in VORBIS_COMMENT's vendor string, it
 * will simply write it's own into the stream.  If no VORBIS_COMMENT
 * block is present in the \a metadata array, libFLAC will write an
 * empty one, containing only the vendor string.
 *
 * \note The Ogg FLAC mapping requires that the VORBIS_COMMENT block be
 * the second metadata block of the stream.  The encoder already supplies
 * the STREAMINFO block automatically.  If \a metadata does not contain a
 * VORBIS_COMMENT block, the encoder will supply that too.  Otherwise, if
 * \a metadata does contain a VORBIS_COMMENT block and it is not the
 * first, the init function will reorder \a metadata by moving the
 * VORBIS_COMMENT block to the front; the relative ordering of the other
 * blocks will remain as they were.
 *
 * \note The Ogg FLAC mapping limits the number of metadata blocks per
 * stream to \c 65535.  If \a num_blocks exceeds this the function will
 * return \c false.
 *
 * \default \c NULL, 0
 * \param  encoder     An encoder instance to set.
 * \param  metadata    See above.
 * \param  num_blocks  See above.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if the encoder is already initialized, else \c true.
 *    \c false if the encoder is already initialized, or if
 *    \a num_blocks > 65535 if encoding to Ogg FLAC, else \c true.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_set_metadata(FLAC__StreamEncoder *encoder, FLAC__StreamMetadata **metadata, unsigned num_blocks);

/** Get the current encoder state.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__StreamEncoderState
 *    The current encoder state.
 */
FLAC_API FLAC__StreamEncoderState FLAC__stream_encoder_get_state(const FLAC__StreamEncoder *encoder);

/** Get the state of the verify stream decoder.
 *  Useful when the stream encoder state is
 *  \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__StreamDecoderState
 *    The verify stream decoder state.
 */
FLAC_API FLAC__StreamDecoderState FLAC__stream_encoder_get_verify_decoder_state(const FLAC__StreamEncoder *encoder);

/** Get the current encoder state as a C string.
 *  This version automatically resolves
 *  \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR by getting the
 *  verify decoder's state.
 *
 * \param  encoder  A encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval const char *
 *    The encoder state as a C string.  Do not modify the contents.
 */
FLAC_API const char *FLAC__stream_encoder_get_resolved_state_string(const FLAC__StreamEncoder *encoder);

/** Get relevant values about the nature of a verify decoder error.
 *  Useful when the stream encoder state is
 *  \c FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR.  The arguments should
 *  be addresses in which the stats will be returned, or NULL if value
 *  is not desired.
 *
 * \param  encoder  An encoder instance to query.
 * \param  absolute_sample  The absolute sample number of the mismatch.
 * \param  frame_number  The number of the frame in which the mismatch occurred.
 * \param  channel       The channel in which the mismatch occurred.
 * \param  sample        The number of the sample (relative to the frame) in
 *                       which the mismatch occurred.
 * \param  expected      The expected value for the sample in question.
 * \param  got           The actual value returned by the decoder.
 * \assert
 *    \code encoder != NULL \endcode
 */
FLAC_API void FLAC__stream_encoder_get_verify_decoder_error_stats(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_sample, unsigned *frame_number, unsigned *channel, unsigned *sample, FLAC__int32 *expected, FLAC__int32 *got);

/** Get the "verify" flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_verify().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_verify(const FLAC__StreamEncoder *encoder);

/** Get the <A HREF="../format.html#subset>Subset</A> flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_streamable_subset().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_streamable_subset(const FLAC__StreamEncoder *encoder);

/** Get the number of input channels being processed.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_channels().
 */
FLAC_API unsigned FLAC__stream_encoder_get_channels(const FLAC__StreamEncoder *encoder);

/** Get the input sample resolution setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_bits_per_sample().
 */
FLAC_API unsigned FLAC__stream_encoder_get_bits_per_sample(const FLAC__StreamEncoder *encoder);

/** Get the input sample rate setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_sample_rate().
 */
FLAC_API unsigned FLAC__stream_encoder_get_sample_rate(const FLAC__StreamEncoder *encoder);

/** Get the blocksize setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_blocksize().
 */
FLAC_API unsigned FLAC__stream_encoder_get_blocksize(const FLAC__StreamEncoder *encoder);

/** Get the "mid/side stereo coding" flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_get_do_mid_side_stereo().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_do_mid_side_stereo(const FLAC__StreamEncoder *encoder);

/** Get the "adaptive mid/side switching" flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_loose_mid_side_stereo().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_loose_mid_side_stereo(const FLAC__StreamEncoder *encoder);

/** Get the maximum LPC order setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_max_lpc_order().
 */
FLAC_API unsigned FLAC__stream_encoder_get_max_lpc_order(const FLAC__StreamEncoder *encoder);

/** Get the quantized linear predictor coefficient precision setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_qlp_coeff_precision().
 */
FLAC_API unsigned FLAC__stream_encoder_get_qlp_coeff_precision(const FLAC__StreamEncoder *encoder);

/** Get the qlp coefficient precision search flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_do_qlp_coeff_prec_search().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_do_qlp_coeff_prec_search(const FLAC__StreamEncoder *encoder);

/** Get the "escape coding" flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_do_escape_coding().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_do_escape_coding(const FLAC__StreamEncoder *encoder);

/** Get the exhaustive model search flag.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    See FLAC__stream_encoder_set_do_exhaustive_model_search().
 */
FLAC_API FLAC__bool FLAC__stream_encoder_get_do_exhaustive_model_search(const FLAC__StreamEncoder *encoder);

/** Get the minimum residual partition order setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_min_residual_partition_order().
 */
FLAC_API unsigned FLAC__stream_encoder_get_min_residual_partition_order(const FLAC__StreamEncoder *encoder);

/** Get maximum residual partition order setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_max_residual_partition_order().
 */
FLAC_API unsigned FLAC__stream_encoder_get_max_residual_partition_order(const FLAC__StreamEncoder *encoder);

/** Get the Rice parameter search distance setting.
 *
 * \param  encoder  An encoder instance to query.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval unsigned
 *    See FLAC__stream_encoder_set_rice_parameter_search_dist().
 */
FLAC_API unsigned FLAC__stream_encoder_get_rice_parameter_search_dist(const FLAC__StreamEncoder *encoder);

/** Get the previously set estimate of the total samples to be encoded.
 *  The encoder merely mimics back the value given to
 *  FLAC__stream_encoder_set_total_samples_estimate() since it has no
 *  other way of knowing how many samples the client will encode.
 *
 * \param  encoder  An encoder instance to set.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__uint64
 *    See FLAC__stream_encoder_get_total_samples_estimate().
 */
FLAC_API FLAC__uint64 FLAC__stream_encoder_get_total_samples_estimate(const FLAC__StreamEncoder *encoder);

/** Initialize the encoder instance to encode native FLAC streams.
 *
 *  This flavor of initialization sets up the encoder to encode to a
 *  native FLAC stream. I/O is performed via callbacks to the client.
 *  For encoding to a plain file via filename or open \c FILE*,
 *  FLAC__stream_encoder_init_file() and FLAC__stream_encoder_init_FILE()
 *  provide a simpler interface.
 *
 *  This function should be called after FLAC__stream_encoder_new() and
 *  FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
 *  or FLAC__stream_encoder_process_interleaved().
 *  initialization succeeded.
 *
 *  The call to FLAC__stream_encoder_init_stream() currently will also
 *  immediately call the write callback several times, once with the \c fLaC
 *  signature, and once for each encoded metadata block.
 *
 * \param  encoder            An uninitialized encoder instance.
 * \param  write_callback     See FLAC__StreamEncoderWriteCallback.  This
 *                            pointer must not be \c NULL.
 * \param  seek_callback      See FLAC__StreamEncoderSeekCallback.  This
 *                            pointer may be \c NULL if seeking is not
 *                            supported.  The encoder uses seeking to go back
 *                            and write some some stream statistics to the
 *                            STREAMINFO block; this is recommended but not
 *                            necessary to create a valid FLAC stream.  If
 *                            \a seek_callback is not \c NULL then a
 *                            \a tell_callback must also be supplied.
 *                            Alternatively, a dummy seek callback that just
 *                            returns \c FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED
 *                            may also be supplied, all though this is slightly
 *                            less efficient for the encoder.
 * \param  tell_callback      See FLAC__StreamEncoderTellCallback.  This
 *                            pointer may be \c NULL if seeking is not
 *                            supported.  If \a seek_callback is \c NULL then
 *                            this argument will be ignored.  If
 *                            \a seek_callback is not \c NULL then a
 *                            \a tell_callback must also be supplied.
 *                            Alternatively, a dummy tell callback that just
 *                            returns \c FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED
 *                            may also be supplied, all though this is slightly
 *                            less efficient for the encoder.
 * \param  metadata_callback  See FLAC__StreamEncoderMetadataCallback.  This
 *                            pointer may be \c NULL if the callback is not
 *                            desired.  If the client provides a seek callback,
 *                            this function is not necessary as the encoder
 *                            will automatically seek back and update the
 *                            STREAMINFO block.  It may also be \c NULL if the
 *                            client does not support seeking, since it will
 *                            have no way of going back to update the
 *                            STREAMINFO.  However the client can still supply
 *                            a callback if it would like to know the details
 *                            from the STREAMINFO.
 * \param  client_data        This value will be supplied to callbacks in their
 *                            \a client_data argument.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__StreamEncoderInitStatus
 *    \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful;
 *    see FLAC__StreamEncoderInitStatus for the meanings of other return values.
 */
FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_stream(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderWriteCallback write_callback, FLAC__StreamEncoderSeekCallback seek_callback, FLAC__StreamEncoderTellCallback tell_callback, FLAC__StreamEncoderMetadataCallback metadata_callback, void *client_data);

/** Initialize the encoder instance to encode Ogg FLAC streams.
 *
 *  This flavor of initialization sets up the encoder to encode to a FLAC
 *  stream in an Ogg container.  I/O is performed via callbacks to the
 *  client.  For encoding to a plain file via filename or open \c FILE*,
 *  FLAC__stream_encoder_init_ogg_file() and FLAC__stream_encoder_init_ogg_FILE()
 *  provide a simpler interface.
 *
 *  This function should be called after FLAC__stream_encoder_new() and
 *  FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
 *  or FLAC__stream_encoder_process_interleaved().
 *  initialization succeeded.
 *
 *  The call to FLAC__stream_encoder_init_ogg_stream() currently will also
 *  immediately call the write callback several times to write the metadata
 *  packets.
 *
 * \param  encoder            An uninitialized encoder instance.
 * \param  read_callback      See FLAC__StreamEncoderReadCallback.  This
 *                            pointer must not be \c NULL if \a seek_callback
 *                            is non-NULL since they are both needed to be
 *                            able to write data back to the Ogg FLAC stream
 *                            in the post-encode phase.
 * \param  write_callback     See FLAC__StreamEncoderWriteCallback.  This
 *                            pointer must not be \c NULL.
 * \param  seek_callback      See FLAC__StreamEncoderSeekCallback.  This
 *                            pointer may be \c NULL if seeking is not
 *                            supported.  The encoder uses seeking to go back
 *                            and write some some stream statistics to the
 *                            STREAMINFO block; this is recommended but not
 *                            necessary to create a valid FLAC stream.  If
 *                            \a seek_callback is not \c NULL then a
 *                            \a tell_callback must also be supplied.
 *                            Alternatively, a dummy seek callback that just
 *                            returns \c FLAC__STREAM_ENCODER_SEEK_STATUS_UNSUPPORTED
 *                            may also be supplied, all though this is slightly
 *                            less efficient for the encoder.
 * \param  tell_callback      See FLAC__StreamEncoderTellCallback.  This
 *                            pointer may be \c NULL if seeking is not
 *                            supported.  If \a seek_callback is \c NULL then
 *                            this argument will be ignored.  If
 *                            \a seek_callback is not \c NULL then a
 *                            \a tell_callback must also be supplied.
 *                            Alternatively, a dummy tell callback that just
 *                            returns \c FLAC__STREAM_ENCODER_TELL_STATUS_UNSUPPORTED
 *                            may also be supplied, all though this is slightly
 *                            less efficient for the encoder.
 * \param  metadata_callback  See FLAC__StreamEncoderMetadataCallback.  This
 *                            pointer may be \c NULL if the callback is not
 *                            desired.  If the client provides a seek callback,
 *                            this function is not necessary as the encoder
 *                            will automatically seek back and update the
 *                            STREAMINFO block.  It may also be \c NULL if the
 *                            client does not support seeking, since it will
 *                            have no way of going back to update the
 *                            STREAMINFO.  However the client can still supply
 *                            a callback if it would like to know the details
 *                            from the STREAMINFO.
 * \param  client_data        This value will be supplied to callbacks in their
 *                            \a client_data argument.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__StreamEncoderInitStatus
 *    \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful;
 *    see FLAC__StreamEncoderInitStatus for the meanings of other return values.
 */
FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_stream(FLAC__StreamEncoder *encoder, FLAC__StreamEncoderReadCallback read_callback, FLAC__StreamEncoderWriteCallback write_callback, FLAC__StreamEncoderSeekCallback seek_callback, FLAC__StreamEncoderTellCallback tell_callback, FLAC__StreamEncoderMetadataCallback metadata_callback, void *client_data);

/** Initialize the encoder instance to encode native FLAC files.
 *
 *  This flavor of initialization sets up the encoder to encode to a
 *  plain native FLAC file.  For non-stdio streams, you must use
 *  FLAC__stream_encoder_init_stream() and provide callbacks for the I/O.
 *
 *  This function should be called after FLAC__stream_encoder_new() and
 *  FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
 *  or FLAC__stream_encoder_process_interleaved().
 *  initialization succeeded.
 *
 * \param  encoder            An uninitialized encoder instance.
 * \param  file               An open file.  The file should have been opened
 *                            with mode \c "w+b" and rewound.  The file
 *                            becomes owned by the encoder and should not be
 *                            manipulated by the client while encoding.
 *                            Unless \a file is \c stdout, it will be closed
 *                            when FLAC__stream_encoder_finish() is called.
 *                            Note however that a proper SEEKTABLE cannot be
 *                            created when encoding to \c stdout since it is
 *                            not seekable.
 * \param  progress_callback  See FLAC__StreamEncoderProgressCallback.  This
 *                            pointer may be \c NULL if the callback is not
 *                            desired.
 * \param  client_data        This value will be supplied to callbacks in their
 *                            \a client_data argument.
 * \assert
 *    \code encoder != NULL \endcode
 *    \code file != NULL \endcode
 * \retval FLAC__StreamEncoderInitStatus
 *    \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful;
 *    see FLAC__StreamEncoderInitStatus for the meanings of other return values.
 */
FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_FILE(FLAC__StreamEncoder *encoder, FILE *file, FLAC__StreamEncoderProgressCallback progress_callback, void *client_data);

/** Initialize the encoder instance to encode Ogg FLAC files.
 *
 *  This flavor of initialization sets up the encoder to encode to a
 *  plain Ogg FLAC file.  For non-stdio streams, you must use
 *  FLAC__stream_encoder_init_ogg_stream() and provide callbacks for the I/O.
 *
 *  This function should be called after FLAC__stream_encoder_new() and
 *  FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
 *  or FLAC__stream_encoder_process_interleaved().
 *  initialization succeeded.
 *
 * \param  encoder            An uninitialized encoder instance.
 * \param  file               An open file.  The file should have been opened
 *                            with mode \c "w+b" and rewound.  The file
 *                            becomes owned by the encoder and should not be
 *                            manipulated by the client while encoding.
 *                            Unless \a file is \c stdout, it will be closed
 *                            when FLAC__stream_encoder_finish() is called.
 *                            Note however that a proper SEEKTABLE cannot be
 *                            created when encoding to \c stdout since it is
 *                            not seekable.
 * \param  progress_callback  See FLAC__StreamEncoderProgressCallback.  This
 *                            pointer may be \c NULL if the callback is not
 *                            desired.
 * \param  client_data        This value will be supplied to callbacks in their
 *                            \a client_data argument.
 * \assert
 *    \code encoder != NULL \endcode
 *    \code file != NULL \endcode
 * \retval FLAC__StreamEncoderInitStatus
 *    \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful;
 *    see FLAC__StreamEncoderInitStatus for the meanings of other return values.
 */
FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_FILE(FLAC__StreamEncoder *encoder, FILE *file, FLAC__StreamEncoderProgressCallback progress_callback, void *client_data);

/** Initialize the encoder instance to encode native FLAC files.
 *
 *  This flavor of initialization sets up the encoder to encode to a plain
 *  FLAC file.  If POSIX fopen() semantics are not sufficient (for example,
 *  with Unicode filenames on Windows), you must use
 *  FLAC__stream_encoder_init_FILE(), or FLAC__stream_encoder_init_stream()
 *  and provide callbacks for the I/O.
 *
 *  This function should be called after FLAC__stream_encoder_new() and
 *  FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
 *  or FLAC__stream_encoder_process_interleaved().
 *  initialization succeeded.
 *
 * \param  encoder            An uninitialized encoder instance.
 * \param  filename           The name of the file to encode to.  The file will
 *                            be opened with fopen().  Use \c NULL to encode to
 *                            \c stdout.  Note however that a proper SEEKTABLE
 *                            cannot be created when encoding to \c stdout since
 *                            it is not seekable.
 * \param  progress_callback  See FLAC__StreamEncoderProgressCallback.  This
 *                            pointer may be \c NULL if the callback is not
 *                            desired.
 * \param  client_data        This value will be supplied to callbacks in their
 *                            \a client_data argument.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__StreamEncoderInitStatus
 *    \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful;
 *    see FLAC__StreamEncoderInitStatus for the meanings of other return values.
 */
FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_file(FLAC__StreamEncoder *encoder, const char *filename, FLAC__StreamEncoderProgressCallback progress_callback, void *client_data);

/** Initialize the encoder instance to encode Ogg FLAC files.
 *
 *  This flavor of initialization sets up the encoder to encode to a plain
 *  Ogg FLAC file.  If POSIX fopen() semantics are not sufficient (for example,
 *  with Unicode filenames on Windows), you must use
 *  FLAC__stream_encoder_init_ogg_FILE(), or FLAC__stream_encoder_init_ogg_stream()
 *  and provide callbacks for the I/O.
 *
 *  This function should be called after FLAC__stream_encoder_new() and
 *  FLAC__stream_encoder_set_*() but before FLAC__stream_encoder_process()
 *  or FLAC__stream_encoder_process_interleaved().
 *  initialization succeeded.
 *
 * \param  encoder            An uninitialized encoder instance.
 * \param  filename           The name of the file to encode to.  The file will
 *                            be opened with fopen().  Use \c NULL to encode to
 *                            \c stdout.  Note however that a proper SEEKTABLE
 *                            cannot be created when encoding to \c stdout since
 *                            it is not seekable.
 * \param  progress_callback  See FLAC__StreamEncoderProgressCallback.  This
 *                            pointer may be \c NULL if the callback is not
 *                            desired.
 * \param  client_data        This value will be supplied to callbacks in their
 *                            \a client_data argument.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__StreamEncoderInitStatus
 *    \c FLAC__STREAM_ENCODER_INIT_STATUS_OK if initialization was successful;
 *    see FLAC__StreamEncoderInitStatus for the meanings of other return values.
 */
FLAC_API FLAC__StreamEncoderInitStatus FLAC__stream_encoder_init_ogg_file(FLAC__StreamEncoder *encoder, const char *filename, FLAC__StreamEncoderProgressCallback progress_callback, void *client_data);

/** Finish the encoding process.
 *  Flushes the encoding buffer, releases resources, resets the encoder
 *  settings to their defaults, and returns the encoder state to
 *  FLAC__STREAM_ENCODER_UNINITIALIZED.  Note that this can generate
 *  one or more write callbacks before returning, and will generate
 *  a metadata callback.
 *
 *  Note that in the course of processing the last frame, errors can
 *  occur, so the caller should be sure to check the return value to
 *  ensure the file was encoded properly.
 *
 *  In the event of a prematurely-terminated encode, it is not strictly
 *  necessary to call this immediately before FLAC__stream_encoder_delete()
 *  but it is good practice to match every FLAC__stream_encoder_init_*()
 *  with a FLAC__stream_encoder_finish().
 *
 * \param  encoder  An uninitialized encoder instance.
 * \assert
 *    \code encoder != NULL \endcode
 * \retval FLAC__bool
 *    \c false if an error occurred processing the last frame; or if verify
 *    mode is set (see FLAC__stream_encoder_set_verify()), there was a
 *    verify mismatch; else \c true.  If \c false, caller should check the
 *    state with FLAC__stream_encoder_get_state() for more information
 *    about the error.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_finish(FLAC__StreamEncoder *encoder);

/** Submit data for encoding.
 *  This version allows you to supply the input data via an array of
 *  pointers, each pointer pointing to an array of \a samples samples
 *  representing one channel.  The samples need not be block-aligned,
 *  but each channel should have the same number of samples.  Each sample
 *  should be a signed integer, right-justified to the resolution set by
 *  FLAC__stream_encoder_set_bits_per_sample().  For example, if the
 *  resolution is 16 bits per sample, the samples should all be in the
 *  range [-32768,32767].
 *
 *  For applications where channel order is important, channels must
 *  follow the order as described in the
 *  <A HREF="../format.html#frame_header">frame header</A>.
 *
 * \param  encoder  An initialized encoder instance in the OK state.
 * \param  buffer   An array of pointers to each channel's signal.
 * \param  samples  The number of samples in one channel.
 * \assert
 *    \code encoder != NULL \endcode
 *    \code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK \endcode
 * \retval FLAC__bool
 *    \c true if successful, else \c false; in this case, check the
 *    encoder state with FLAC__stream_encoder_get_state() to see what
 *    went wrong.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_process(FLAC__StreamEncoder *encoder, const FLAC__int32 * const buffer[], unsigned samples);

/** Submit data for encoding.
 *  This version allows you to supply the input data where the channels
 *  are interleaved into a single array (i.e. channel0_sample0,
 *  channel1_sample0, ... , channelN_sample0, channel0_sample1, ...).
 *  The samples need not be block-aligned but they must be
 *  sample-aligned, i.e. the first value should be channel0_sample0
 *  and the last value channelN_sampleM.  Each sample should be a signed
 *  integer, right-justified to the resolution set by
 *  FLAC__stream_encoder_set_bits_per_sample().  For example, if the
 *  resolution is 16 bits per sample, the samples should all be in the
 *  range [-32768,32767].
 *
 *  For applications where channel order is important, channels must
 *  follow the order as described in the
 *  <A HREF="../format.html#frame_header">frame header</A>.
 *
 * \param  encoder  An initialized encoder instance in the OK state.
 * \param  buffer   An array of channel-interleaved data (see above).
 * \param  samples  The number of samples in one channel, the same as for
 *                  FLAC__stream_encoder_process().  For example, if
 *                  encoding two channels, \c 1000 \a samples corresponds
 *                  to a \a buffer of 2000 values.
 * \assert
 *    \code encoder != NULL \endcode
 *    \code FLAC__stream_encoder_get_state(encoder) == FLAC__STREAM_ENCODER_OK \endcode
 * \retval FLAC__bool
 *    \c true if successful, else \c false; in this case, check the
 *    encoder state with FLAC__stream_encoder_get_state() to see what
 *    went wrong.
 */
FLAC_API FLAC__bool FLAC__stream_encoder_process_interleaved(FLAC__StreamEncoder *encoder, const FLAC__int32 buffer[], unsigned samples);

/* \} */

#ifdef __cplusplus
}
#endif

#endif