aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/iff.c
blob: b07b6c8b1879b740f144d9ca302844aaf0bcda87 (plain) (blame)
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
/*
 * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
 * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * IFF file demuxer
 * by Jaikrishnan Menon
 * for more information on the .iff file format, visit:
 * http://wiki.multimedia.cx/index.php?title=IFF
 */

#include <inttypes.h>

#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "id3v2.h"
#include "internal.h"

#define ID_8SVX       MKTAG('8','S','V','X')
#define ID_16SV       MKTAG('1','6','S','V')
#define ID_MAUD       MKTAG('M','A','U','D')
#define ID_MHDR       MKTAG('M','H','D','R')
#define ID_MDAT       MKTAG('M','D','A','T')
#define ID_VHDR       MKTAG('V','H','D','R')
#define ID_ATAK       MKTAG('A','T','A','K')
#define ID_RLSE       MKTAG('R','L','S','E')
#define ID_CHAN       MKTAG('C','H','A','N')
#define ID_PBM        MKTAG('P','B','M',' ')
#define ID_ILBM       MKTAG('I','L','B','M')
#define ID_BMHD       MKTAG('B','M','H','D')
#define ID_DGBL       MKTAG('D','G','B','L')
#define ID_CAMG       MKTAG('C','A','M','G')
#define ID_CMAP       MKTAG('C','M','A','P')
#define ID_ACBM       MKTAG('A','C','B','M')
#define ID_DEEP       MKTAG('D','E','E','P')
#define ID_RGB8       MKTAG('R','G','B','8')
#define ID_RGBN       MKTAG('R','G','B','N')
#define ID_DSD        MKTAG('D','S','D',' ')
#define ID_DST        MKTAG('D','S','T',' ')
#define ID_DSTC       MKTAG('D','S','T','C')
#define ID_DSTF       MKTAG('D','S','T','F')
#define ID_FRTE       MKTAG('F','R','T','E')
#define ID_ANIM       MKTAG('A','N','I','M')
#define ID_ANHD       MKTAG('A','N','H','D')
#define ID_DLTA       MKTAG('D','L','T','A')
#define ID_DPAN       MKTAG('D','P','A','N')

#define ID_FORM       MKTAG('F','O','R','M')
#define ID_FRM8       MKTAG('F','R','M','8')
#define ID_ANNO       MKTAG('A','N','N','O')
#define ID_AUTH       MKTAG('A','U','T','H')
#define ID_CHRS       MKTAG('C','H','R','S')
#define ID_COPYRIGHT  MKTAG('(','c',')',' ')
#define ID_CSET       MKTAG('C','S','E','T')
#define ID_FVER       MKTAG('F','V','E','R')
#define ID_NAME       MKTAG('N','A','M','E')
#define ID_TEXT       MKTAG('T','E','X','T')
#define ID_ABIT       MKTAG('A','B','I','T')
#define ID_BODY       MKTAG('B','O','D','Y')
#define ID_DBOD       MKTAG('D','B','O','D')
#define ID_DPEL       MKTAG('D','P','E','L')
#define ID_DLOC       MKTAG('D','L','O','C')
#define ID_TVDC       MKTAG('T','V','D','C')

#define LEFT    2
#define RIGHT   4
#define STEREO  6

/**
 * This number of bytes if added at the beginning of each AVPacket
 * which contain additional information about video properties
 * which has to be shared between demuxer and decoder.
 * This number may change between frames, e.g. the demuxer might
 * set it to smallest possible size of 2 to indicate that there's
 * no extradata changing in this frame.
 */
#define IFF_EXTRA_VIDEO_SIZE 41

typedef enum {
    COMP_NONE,
    COMP_FIB,
    COMP_EXP
} svx8_compression_type;

typedef struct IffDemuxContext {
    int      is_64bit;  ///< chunk size is 64-bit
    int64_t  body_pos;
    int64_t  body_end;
    uint32_t  body_size;
    svx8_compression_type   svx8_compression;
    unsigned  maud_bits;
    unsigned  maud_compression;
    unsigned  bitmap_compression;  ///< delta compression method used
    unsigned  bpp;          ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
    unsigned  ham;          ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
    unsigned  flags;        ///< 1 for EHB, 0 is no extra half darkening
    unsigned  transparency; ///< transparency color index in palette
    unsigned  masking;      ///< masking method used
    uint8_t   tvdc[32];     ///< TVDC lookup table
    int64_t   pts;
} IffDemuxContext;

/* Metadata string read */
static int get_metadata(AVFormatContext *s,
                        const char *const tag,
                        const unsigned data_size)
{
    uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);

    if (!buf)
        return AVERROR(ENOMEM);

    if (avio_read(s->pb, buf, data_size) != data_size) {
        av_free(buf);
        return AVERROR(EIO);
    }
    buf[data_size] = 0;
    av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
    return 0;
}

static int iff_probe(const AVProbeData *p)
{
    const uint8_t *d = p->buf;

    if ( (AV_RL32(d)   == ID_FORM &&
         (AV_RL32(d+8) == ID_8SVX ||
          AV_RL32(d+8) == ID_16SV ||
          AV_RL32(d+8) == ID_MAUD ||
          AV_RL32(d+8) == ID_PBM  ||
          AV_RL32(d+8) == ID_ACBM ||
          AV_RL32(d+8) == ID_DEEP ||
          AV_RL32(d+8) == ID_ILBM ||
          AV_RL32(d+8) == ID_RGB8 ||
          AV_RL32(d+8) == ID_ANIM ||
          AV_RL32(d+8) == ID_RGBN)) ||
         (AV_RL32(d) == ID_FRM8 && AV_RL32(d+12) == ID_DSD))
        return AVPROBE_SCORE_MAX;
    return 0;
}

static const AVCodecTag dsd_codec_tags[] = {
    { AV_CODEC_ID_DSD_MSBF, ID_DSD },
    { AV_CODEC_ID_DST,      ID_DST },
    { AV_CODEC_ID_NONE, 0 },
};


#define DSD_SLFT MKTAG('S','L','F','T')
#define DSD_SRGT MKTAG('S','R','G','T')
#define DSD_MLFT MKTAG('M','L','F','T')
#define DSD_MRGT MKTAG('M','R','G','T')
#define DSD_C    MKTAG('C',' ',' ',' ')
#define DSD_LS   MKTAG('L','S',' ',' ')
#define DSD_RS   MKTAG('R','S',' ',' ')
#define DSD_LFE  MKTAG('L','F','E',' ')

static const uint32_t dsd_stereo[]  = { DSD_SLFT, DSD_SRGT };
static const uint32_t dsd_5point0[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LS, DSD_RS };
static const uint32_t dsd_5point1[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LFE, DSD_LS, DSD_RS };

typedef struct {
    uint64_t layout;
    const uint32_t * dsd_layout;
} DSDLayoutDesc;

static const DSDLayoutDesc dsd_channel_layout[] = {
    { AV_CH_LAYOUT_STEREO,  dsd_stereo },
    { AV_CH_LAYOUT_5POINT0, dsd_5point0 },
    { AV_CH_LAYOUT_5POINT1, dsd_5point1 },
};

static const uint64_t dsd_loudspeaker_config[] = {
    AV_CH_LAYOUT_STEREO,
    0, 0,
    AV_CH_LAYOUT_5POINT0, AV_CH_LAYOUT_5POINT1,
};

static const char * dsd_source_comment[] = {
    "dsd_source_comment",
    "analogue_source_comment",
    "pcm_source_comment",
};

static const char * dsd_history_comment[] = {
    "general_remark",
    "operator_name",
    "creating_machine",
    "timezone",
    "file_revision"
};

static int parse_dsd_diin(AVFormatContext *s, AVStream *st, uint64_t eof)
{
    AVIOContext *pb = s->pb;

    while (avio_tell(pb) + 12 <= eof && !avio_feof(pb)) {
        uint32_t tag      = avio_rl32(pb);
        uint64_t size     = avio_rb64(pb);
        uint64_t orig_pos = avio_tell(pb);
        const char * metadata_tag = NULL;

        if (size >= INT64_MAX)
            return AVERROR_INVALIDDATA;

        switch(tag) {
        case MKTAG('D','I','A','R'): metadata_tag = "artist"; break;
        case MKTAG('D','I','T','I'): metadata_tag = "title";  break;
        }

        if (metadata_tag && size > 4) {
            unsigned int tag_size = avio_rb32(pb);
            int ret = get_metadata(s, metadata_tag, FFMIN(tag_size, size - 4));
            if (ret < 0) {
                av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
                return ret;
            }
        }

        avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
    }

    return 0;
}

static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)
{
    AVIOContext *pb = s->pb;
    char abss[24];
    int hour, min, sec, i, ret, config;
    int dsd_layout[6];
    ID3v2ExtraMeta *id3v2_extra_meta;

    while (avio_tell(pb) + 12 <= eof && !avio_feof(pb)) {
        uint32_t tag      = avio_rl32(pb);
        uint64_t size     = avio_rb64(pb);
        uint64_t orig_pos = avio_tell(pb);

        if (size >= INT64_MAX)
            return AVERROR_INVALIDDATA;

        switch(tag) {
        case MKTAG('A','B','S','S'):
            if (size < 8)
                return AVERROR_INVALIDDATA;
            hour = avio_rb16(pb);
            min  = avio_r8(pb);
            sec  = avio_r8(pb);
            snprintf(abss, sizeof(abss), "%02dh:%02dm:%02ds:%d", hour, min, sec, avio_rb32(pb));
            av_dict_set(&st->metadata, "absolute_start_time", abss, 0);
            break;

        case MKTAG('C','H','N','L'):
            if (size < 2)
                return AVERROR_INVALIDDATA;
            st->codecpar->channels       = avio_rb16(pb);
            if (size < 2 + st->codecpar->channels * 4)
                return AVERROR_INVALIDDATA;
            st->codecpar->channel_layout = 0;
            if (st->codecpar->channels > FF_ARRAY_ELEMS(dsd_layout)) {
                avpriv_request_sample(s, "channel layout");
                break;
            }
            for (i = 0; i < st->codecpar->channels; i++)
                dsd_layout[i] = avio_rl32(pb);
            for (i = 0; i < FF_ARRAY_ELEMS(dsd_channel_layout); i++) {
                const DSDLayoutDesc * d = &dsd_channel_layout[i];
                if (av_get_channel_layout_nb_channels(d->layout) == st->codecpar->channels &&
                    !memcmp(d->dsd_layout, dsd_layout, st->codecpar->channels * sizeof(uint32_t))) {
                    st->codecpar->channel_layout = d->layout;
                    break;
                }
            }
            break;

        case MKTAG('C','M','P','R'):
            if (size < 4)
                return AVERROR_INVALIDDATA;
            st->codecpar->codec_tag = tag = avio_rl32(pb);
            st->codecpar->codec_id = ff_codec_get_id(dsd_codec_tags, tag);
            if (!st->codecpar->codec_id) {
                av_log(s, AV_LOG_ERROR, "'%s' compression is not supported\n",
                       av_fourcc2str(tag));
                return AVERROR_PATCHWELCOME;
            }
            break;

        case MKTAG('F','S',' ',' '):
            if (size < 4)
                return AVERROR_INVALIDDATA;
            st->codecpar->sample_rate = avio_rb32(pb) / 8;
            break;

        case MKTAG('I','D','3',' '):
            id3v2_extra_meta = NULL;
            ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
            if (id3v2_extra_meta) {
                if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0 ||
                    (ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0) {
                    ff_id3v2_free_extra_meta(&id3v2_extra_meta);
                    return ret;
                }
                ff_id3v2_free_extra_meta(&id3v2_extra_meta);
            }

            if (size < avio_tell(pb) - orig_pos) {
                av_log(s, AV_LOG_ERROR, "id3 exceeds chunk size\n");
                return AVERROR_INVALIDDATA;
            }
            break;

        case MKTAG('L','S','C','O'):
            if (size < 2)
                return AVERROR_INVALIDDATA;
            config = avio_rb16(pb);
            if (config != 0xFFFF) {
                if (config < FF_ARRAY_ELEMS(dsd_loudspeaker_config))
                    st->codecpar->channel_layout = dsd_loudspeaker_config[config];
                if (!st->codecpar->channel_layout)
                    avpriv_request_sample(s, "loudspeaker configuration %d", config);
            }
            break;
        }

        avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
    }

    return 0;
}

static int read_dst_frame(AVFormatContext *s, AVPacket *pkt)
{
    IffDemuxContext *iff = s->priv_data;
    AVIOContext *pb = s->pb;
    uint32_t chunk_id;
    uint64_t chunk_pos, data_pos, data_size;
    int ret = AVERROR_EOF;

    while (!avio_feof(pb)) {
        chunk_pos = avio_tell(pb);
        if (chunk_pos >= iff->body_end)
            return AVERROR_EOF;

        chunk_id = avio_rl32(pb);
        data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);
        data_pos = avio_tell(pb);

        if (data_size < 1 || data_size >= INT64_MAX)
            return AVERROR_INVALIDDATA;

        switch (chunk_id) {
        case ID_DSTF:
            if (!pkt) {
                iff->body_pos  = avio_tell(pb) - (iff->is_64bit ? 12 : 8);
                iff->body_size = iff->body_end - iff->body_pos;
                return 0;
            }
            ret = av_get_packet(pb, pkt, data_size);
            if (ret < 0)
                return ret;
            if (data_size & 1)
                avio_skip(pb, 1);
            pkt->flags |= AV_PKT_FLAG_KEY;
            pkt->stream_index = 0;
            pkt->duration = 588 * s->streams[0]->codecpar->sample_rate / 44100;
            pkt->pos = chunk_pos;

            chunk_pos = avio_tell(pb);
            if (chunk_pos >= iff->body_end)
                return 0;

            avio_seek(pb, chunk_pos, SEEK_SET);
            return 0;

        case ID_FRTE:
            if (data_size < 4)
                return AVERROR_INVALIDDATA;
            s->streams[0]->duration = avio_rb32(pb) * 588LL * s->streams[0]->codecpar->sample_rate / 44100;
            break;
        }

        avio_skip(pb, data_size - (avio_tell(pb) - data_pos) + (data_size & 1));
    }

    return ret;
}

static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
static const uint8_t deep_rgba[]  = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
static const uint8_t deep_bgra[]  = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};
static const uint8_t deep_argb[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};
static const uint8_t deep_abgr[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};

static int iff_read_header(AVFormatContext *s)
{
    IffDemuxContext *iff = s->priv_data;
    AVIOContext *pb = s->pb;
    AVStream *st;
    uint8_t *buf;
    uint32_t chunk_id;
    uint64_t data_size;
    uint32_t screenmode = 0, num, den;
    unsigned transparency = 0;
    unsigned masking = 0; // no mask
    uint8_t fmt[16];
    int fmt_size;

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);

    st->codecpar->channels = 1;
    st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
    iff->is_64bit = avio_rl32(pb) == ID_FRM8;
    avio_skip(pb, iff->is_64bit ? 8 : 4);
    // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
    st->codecpar->codec_tag = avio_rl32(pb);
    if (st->codecpar->codec_tag == ID_ANIM) {
        avio_skip(pb, 12);
    }
    iff->bitmap_compression = -1;
    iff->svx8_compression = -1;
    iff->maud_bits = -1;
    iff->maud_compression = -1;

    while(!avio_feof(pb)) {
        uint64_t orig_pos;
        int res;
        const char *metadata_tag = NULL;
        int version, nb_comments, i;
        chunk_id = avio_rl32(pb);
        data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);
        orig_pos = avio_tell(pb);

        if (data_size >= INT64_MAX)
            return AVERROR_INVALIDDATA;

        switch(chunk_id) {
        case ID_VHDR:
            st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

            if (data_size < 14)
                return AVERROR_INVALIDDATA;
            avio_skip(pb, 12);
            st->codecpar->sample_rate = avio_rb16(pb);
            if (data_size >= 16) {
                avio_skip(pb, 1);
                iff->svx8_compression = avio_r8(pb);
            }
            break;

        case ID_MHDR:
            st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

            if (data_size < 32)
                return AVERROR_INVALIDDATA;
            avio_skip(pb, 4);
            iff->maud_bits = avio_rb16(pb);
            avio_skip(pb, 2);
            num = avio_rb32(pb);
            den = avio_rb16(pb);
            if (!den)
                return AVERROR_INVALIDDATA;
            avio_skip(pb, 2);
            st->codecpar->sample_rate = num / den;
            st->codecpar->channels = avio_rb16(pb);
            iff->maud_compression = avio_rb16(pb);
            if (st->codecpar->channels == 1)
                st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
            else if (st->codecpar->channels == 2)
                st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
            break;

        case ID_ABIT:
        case ID_BODY:
        case ID_DBOD:
        case ID_DSD:
        case ID_DST:
        case ID_MDAT:
            iff->body_pos = avio_tell(pb);
            iff->body_end = iff->body_pos + data_size;
            iff->body_size = data_size;
            if (chunk_id == ID_DST) {
                int ret = read_dst_frame(s, NULL);
                if (ret < 0)
                    return ret;
            }
            break;

        case ID_CHAN:
            if (data_size < 4)
                return AVERROR_INVALIDDATA;
            if (avio_rb32(pb) < 6) {
                st->codecpar->channels       = 1;
                st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
            } else {
                st->codecpar->channels       = 2;
                st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
            }
            break;

        case ID_CAMG:
            if (data_size < 4)
                return AVERROR_INVALIDDATA;
            screenmode                = avio_rb32(pb);
            break;

        case ID_CMAP:
            if (data_size < 3 || data_size > 768 || data_size % 3) {
                 av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %"PRIu64"\n",
                        data_size);
                 return AVERROR_INVALIDDATA;
            }
            res = ff_alloc_extradata(st->codecpar,
                                     data_size + IFF_EXTRA_VIDEO_SIZE);
            if (res < 0)
                return res;
            if (avio_read(pb, st->codecpar->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0) {
                av_freep(&st->codecpar->extradata);
                st->codecpar->extradata_size = 0;
                return AVERROR(EIO);
            }
            break;

        case ID_BMHD:
            st->codecpar->codec_type            = AVMEDIA_TYPE_VIDEO;
            if (data_size <= 8)
                return AVERROR_INVALIDDATA;
            st->codecpar->width                 = avio_rb16(pb);
            st->codecpar->height                = avio_rb16(pb);
            avio_skip(pb, 4); // x, y offset
            st->codecpar->bits_per_coded_sample = avio_r8(pb);
            if (data_size >= 10)
                masking                      = avio_r8(pb);
            if (data_size >= 11)
                iff->bitmap_compression      = avio_r8(pb);
            if (data_size >= 14) {
                avio_skip(pb, 1); // padding
                transparency                 = avio_rb16(pb);
            }
            if (data_size >= 16) {
                st->sample_aspect_ratio.num  = avio_r8(pb);
                st->sample_aspect_ratio.den  = avio_r8(pb);
            }
            break;

        case ID_ANHD:
            break;

        case ID_DPAN:
            avio_skip(pb, 2);
            st->duration = avio_rb16(pb);
            break;

        case ID_DPEL:
            if (data_size < 4 || (data_size & 3))
                return AVERROR_INVALIDDATA;
            if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)
                return fmt_size;
            if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))
                st->codecpar->format = AV_PIX_FMT_RGB24;
            else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))
                st->codecpar->format = AV_PIX_FMT_RGBA;
            else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))
                st->codecpar->format = AV_PIX_FMT_BGRA;
            else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))
                st->codecpar->format = AV_PIX_FMT_ARGB;
            else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))
                st->codecpar->format = AV_PIX_FMT_ABGR;
            else {
                avpriv_request_sample(s, "color format %.16s", fmt);
                return AVERROR_PATCHWELCOME;
            }
            break;

        case ID_DGBL:
            st->codecpar->codec_type         = AVMEDIA_TYPE_VIDEO;
            if (data_size < 8)
                return AVERROR_INVALIDDATA;
            st->codecpar->width              = avio_rb16(pb);
            st->codecpar->height             = avio_rb16(pb);
            iff->bitmap_compression          = avio_rb16(pb);
            st->sample_aspect_ratio.num      = avio_r8(pb);
            st->sample_aspect_ratio.den      = avio_r8(pb);
            st->codecpar->bits_per_coded_sample = 24;
            break;

        case ID_DLOC:
            if (data_size < 4)
                return AVERROR_INVALIDDATA;
            st->codecpar->width  = avio_rb16(pb);
            st->codecpar->height = avio_rb16(pb);
            break;

        case ID_TVDC:
            if (data_size < sizeof(iff->tvdc))
                return AVERROR_INVALIDDATA;
            res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));
            if (res < 0)
                return res;
            break;

        case ID_ANNO:
        case ID_TEXT:      metadata_tag = "comment";   break;
        case ID_AUTH:      metadata_tag = "artist";    break;
        case ID_COPYRIGHT: metadata_tag = "copyright"; break;
        case ID_NAME:      metadata_tag = "title";     break;

        /* DSD tags */

        case MKTAG('F','V','E','R'):
            if (data_size < 4)
                return AVERROR_INVALIDDATA;
            version = avio_rb32(pb);
            av_log(s, AV_LOG_DEBUG, "DSIFF v%d.%d.%d.%d\n",version >> 24, (version >> 16) & 0xFF, (version >> 8) & 0xFF, version & 0xFF);
            st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
            break;

        case MKTAG('D','I','I','N'):
            res = parse_dsd_diin(s, st, orig_pos + data_size);
            if (res < 0)
                return res;
            break;

        case MKTAG('P','R','O','P'):
            if (data_size < 4)
                return AVERROR_INVALIDDATA;
            if (avio_rl32(pb) != MKTAG('S','N','D',' ')) {
                avpriv_request_sample(s, "unknown property type");
                break;
            }
            res = parse_dsd_prop(s, st, orig_pos + data_size);
            if (res < 0)
                return res;
            break;

        case MKTAG('C','O','M','T'):
            if (data_size < 2)
                return AVERROR_INVALIDDATA;
            nb_comments = avio_rb16(pb);
            for (i = 0; i < nb_comments; i++) {
                int year, mon, day, hour, min, type, ref;
                char tmp[24];
                const char *tag;
                int metadata_size;

                year = avio_rb16(pb);
                mon  = avio_r8(pb);
                day  = avio_r8(pb);
                hour = avio_r8(pb);
                min  = avio_r8(pb);
                snprintf(tmp, sizeof(tmp), "%04d-%02d-%02d %02d:%02d", year, mon, day, hour, min);
                av_dict_set(&st->metadata, "comment_time", tmp, 0);

                type = avio_rb16(pb);
                ref  = avio_rb16(pb);
                switch (type) {
                case 1:
                    if (!i)
                        tag = "channel_comment";
                    else {
                        snprintf(tmp, sizeof(tmp), "channel%d_comment", ref);
                        tag = tmp;
                    }
                    break;
                case 2:
                    tag = ref < FF_ARRAY_ELEMS(dsd_source_comment) ? dsd_source_comment[ref] : "source_comment";
                    break;
                case 3:
                    tag = ref < FF_ARRAY_ELEMS(dsd_history_comment) ? dsd_history_comment[ref] : "file_history";
                    break;
                default:
                    tag = "comment";
                }

                metadata_size  = avio_rb32(pb);
                if ((res = get_metadata(s, tag, metadata_size)) < 0) {
                    av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", tag);
                    return res;
                }

                if (metadata_size & 1)
                    avio_skip(pb, 1);
            }
            break;
        }

        if (metadata_tag) {
            if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
                av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
                return res;
            }
        }
        avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
    }

    if (st->codecpar->codec_tag == ID_ANIM)
        avio_seek(pb, 12, SEEK_SET);
    else
        avio_seek(pb, iff->body_pos, SEEK_SET);

    switch(st->codecpar->codec_type) {
    case AVMEDIA_TYPE_AUDIO:
        avpriv_set_pts_info(st, 32, 1, st->codecpar->sample_rate);

        if (st->codecpar->codec_tag == ID_16SV)
            st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;
        else if (st->codecpar->codec_tag == ID_MAUD) {
            if (iff->maud_bits == 8 && !iff->maud_compression) {
                st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
            } else if (iff->maud_bits == 16 && !iff->maud_compression) {
                st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
            } else if (iff->maud_bits ==  8 && iff->maud_compression == 2) {
                st->codecpar->codec_id = AV_CODEC_ID_PCM_ALAW;
            } else if (iff->maud_bits ==  8 && iff->maud_compression == 3) {
                st->codecpar->codec_id = AV_CODEC_ID_PCM_MULAW;
            } else {
                avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);
                return AVERROR_PATCHWELCOME;
            }
        } else if (st->codecpar->codec_tag != ID_DSD &&
                   st->codecpar->codec_tag != ID_DST) {
            switch (iff->svx8_compression) {
            case COMP_NONE:
                st->codecpar->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
                break;
            case COMP_FIB:
                st->codecpar->codec_id = AV_CODEC_ID_8SVX_FIB;
                break;
            case COMP_EXP:
                st->codecpar->codec_id = AV_CODEC_ID_8SVX_EXP;
                break;
            default:
                av_log(s, AV_LOG_ERROR,
                       "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
                return -1;
            }
        }

        st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id);
        st->codecpar->bit_rate = (int64_t)st->codecpar->channels * st->codecpar->sample_rate * st->codecpar->bits_per_coded_sample;
        st->codecpar->block_align = st->codecpar->channels * st->codecpar->bits_per_coded_sample;
        if ((st->codecpar->codec_tag == ID_DSD || st->codecpar->codec_tag == ID_MAUD) && st->codecpar->block_align <= 0)
            return AVERROR_INVALIDDATA;
        break;

    case AVMEDIA_TYPE_VIDEO:
        iff->bpp          = st->codecpar->bits_per_coded_sample;
        if (st->codecpar->codec_tag == ID_ANIM)
            avpriv_set_pts_info(st, 32, 1, 60);
        if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
            iff->ham      = iff->bpp > 6 ? 6 : 4;
            st->codecpar->bits_per_coded_sample = 24;
        }
        iff->flags        = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
        iff->masking      = masking;
        iff->transparency = transparency;

        if (!st->codecpar->extradata) {
            int ret = ff_alloc_extradata(st->codecpar, IFF_EXTRA_VIDEO_SIZE);
            if (ret < 0)
                return ret;
        }
        av_assert0(st->codecpar->extradata_size >= IFF_EXTRA_VIDEO_SIZE);
        buf = st->codecpar->extradata;
        bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
        bytestream_put_byte(&buf, iff->bitmap_compression);
        bytestream_put_byte(&buf, iff->bpp);
        bytestream_put_byte(&buf, iff->ham);
        bytestream_put_byte(&buf, iff->flags);
        bytestream_put_be16(&buf, iff->transparency);
        bytestream_put_byte(&buf, iff->masking);
        bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));
        st->codecpar->codec_id = AV_CODEC_ID_IFF_ILBM;
        break;
    default:
        return -1;
    }

    return 0;
}

static unsigned get_anim_duration(uint8_t *buf, int size)
{
    GetByteContext gb;

    bytestream2_init(&gb, buf, size);
    bytestream2_skip(&gb, 4);
    while (bytestream2_get_bytes_left(&gb) > 8) {
        unsigned chunk = bytestream2_get_le32(&gb);
        unsigned size = bytestream2_get_be32(&gb);

        if (chunk == ID_ANHD) {
            if (size < 40)
                break;
            bytestream2_skip(&gb, 14);
            return bytestream2_get_be32(&gb);
        } else {
            bytestream2_skip(&gb, size + size & 1);
        }
    }
    return 10;
}

static int iff_read_packet(AVFormatContext *s,
                           AVPacket *pkt)
{
    IffDemuxContext *iff = s->priv_data;
    AVIOContext *pb = s->pb;
    AVStream *st = s->streams[0];
    int ret;
    int64_t pos = avio_tell(pb);

    if (avio_feof(pb))
        return AVERROR_EOF;
    if (st->codecpar->codec_tag != ID_ANIM && pos >= iff->body_end)
        return AVERROR_EOF;

    if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
        if (st->codecpar->codec_tag == ID_DSD || st->codecpar->codec_tag == ID_MAUD) {
            ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * st->codecpar->block_align));
        } else if (st->codecpar->codec_tag == ID_DST) {
            return read_dst_frame(s, pkt);
        } else {
            if (iff->body_size > INT_MAX || !iff->body_size)
                return AVERROR_INVALIDDATA;
            ret = av_get_packet(pb, pkt, iff->body_size);
        }
    } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
               st->codecpar->codec_tag  == ID_ANIM) {
        uint64_t data_size, orig_pos;
        uint32_t chunk_id, chunk_id2;

        while (!avio_feof(pb)) {
            if (avio_feof(pb))
                return AVERROR_EOF;

            orig_pos  = avio_tell(pb);
            chunk_id  = avio_rl32(pb);
            data_size = avio_rb32(pb);
            chunk_id2 = avio_rl32(pb);

            if (chunk_id  == ID_FORM &&
                chunk_id2 == ID_ILBM) {
                avio_skip(pb, -4);
                break;
            } else if (chunk_id == ID_FORM &&
                       chunk_id2 == ID_ANIM) {
                continue;
            } else {
                avio_skip(pb, data_size);
            }
        }
        ret = av_get_packet(pb, pkt, data_size);
        pkt->pos = orig_pos;
        pkt->duration = get_anim_duration(pkt->data, pkt->size);
        if (pos == 12)
            pkt->flags |= AV_PKT_FLAG_KEY;
    } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
               st->codecpar->codec_tag  != ID_ANIM) {
        if (iff->body_size > INT_MAX || !iff->body_size)
            return AVERROR_INVALIDDATA;
        ret = av_get_packet(pb, pkt, iff->body_size);
        pkt->pos = pos;
        if (pos == iff->body_pos)
            pkt->flags |= AV_PKT_FLAG_KEY;
    } else {
        av_assert0(0);
    }

    if (ret < 0)
        return ret;
    pkt->stream_index = 0;
    return ret;
}

AVInputFormat ff_iff_demuxer = {
    .name           = "iff",
    .long_name      = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),
    .priv_data_size = sizeof(IffDemuxContext),
    .read_probe     = iff_probe,
    .read_header    = iff_read_header,
    .read_packet    = iff_read_packet,
    .flags          = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
};