FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/iff.c
Date: 2025-03-08 20:38:41
Exec Total Coverage
Lines: 262 611 42.9%
Functions: 7 10 70.0%
Branches: 152 452 33.6%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
3 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
4 * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * IFF file demuxer
26 * by Jaikrishnan Menon
27 * for more information on the .iff file format, visit:
28 * http://wiki.multimedia.cx/index.php?title=IFF
29 */
30
31 #include <inttypes.h>
32
33 #include "libavutil/avassert.h"
34 #include "libavutil/channel_layout.h"
35 #include "libavutil/intreadwrite.h"
36 #include "libavutil/dict.h"
37 #include "libavutil/mem.h"
38 #include "libavcodec/bytestream.h"
39 #include "avformat.h"
40 #include "demux.h"
41 #include "id3v2.h"
42 #include "internal.h"
43
44 #define ID_8SVX MKTAG('8','S','V','X')
45 #define ID_16SV MKTAG('1','6','S','V')
46 #define ID_MAUD MKTAG('M','A','U','D')
47 #define ID_MHDR MKTAG('M','H','D','R')
48 #define ID_MDAT MKTAG('M','D','A','T')
49 #define ID_VHDR MKTAG('V','H','D','R')
50 #define ID_ATAK MKTAG('A','T','A','K')
51 #define ID_RLSE MKTAG('R','L','S','E')
52 #define ID_CHAN MKTAG('C','H','A','N')
53 #define ID_PBM MKTAG('P','B','M',' ')
54 #define ID_ILBM MKTAG('I','L','B','M')
55 #define ID_BMHD MKTAG('B','M','H','D')
56 #define ID_DGBL MKTAG('D','G','B','L')
57 #define ID_CAMG MKTAG('C','A','M','G')
58 #define ID_CMAP MKTAG('C','M','A','P')
59 #define ID_ACBM MKTAG('A','C','B','M')
60 #define ID_DEEP MKTAG('D','E','E','P')
61 #define ID_RGB8 MKTAG('R','G','B','8')
62 #define ID_RGBN MKTAG('R','G','B','N')
63 #define ID_DSD MKTAG('D','S','D',' ')
64 #define ID_DST MKTAG('D','S','T',' ')
65 #define ID_DSTC MKTAG('D','S','T','C')
66 #define ID_DSTF MKTAG('D','S','T','F')
67 #define ID_FRTE MKTAG('F','R','T','E')
68 #define ID_ANIM MKTAG('A','N','I','M')
69 #define ID_ANHD MKTAG('A','N','H','D')
70 #define ID_DLTA MKTAG('D','L','T','A')
71 #define ID_DPAN MKTAG('D','P','A','N')
72
73 #define ID_FORM MKTAG('F','O','R','M')
74 #define ID_FRM8 MKTAG('F','R','M','8')
75 #define ID_ANNO MKTAG('A','N','N','O')
76 #define ID_AUTH MKTAG('A','U','T','H')
77 #define ID_CHRS MKTAG('C','H','R','S')
78 #define ID_COPYRIGHT MKTAG('(','c',')',' ')
79 #define ID_CSET MKTAG('C','S','E','T')
80 #define ID_FVER MKTAG('F','V','E','R')
81 #define ID_NAME MKTAG('N','A','M','E')
82 #define ID_TEXT MKTAG('T','E','X','T')
83 #define ID_ABIT MKTAG('A','B','I','T')
84 #define ID_BODY MKTAG('B','O','D','Y')
85 #define ID_DBOD MKTAG('D','B','O','D')
86 #define ID_DPEL MKTAG('D','P','E','L')
87 #define ID_DLOC MKTAG('D','L','O','C')
88 #define ID_TVDC MKTAG('T','V','D','C')
89
90 #define LEFT 2
91 #define RIGHT 4
92 #define STEREO 6
93
94 /**
95 * This number of bytes if added at the beginning of each AVPacket
96 * which contain additional information about video properties
97 * which has to be shared between demuxer and decoder.
98 * This number may change between frames, e.g. the demuxer might
99 * set it to smallest possible size of 2 to indicate that there's
100 * no extradata changing in this frame.
101 */
102 #define IFF_EXTRA_VIDEO_SIZE 41
103
104 typedef enum {
105 COMP_NONE,
106 COMP_FIB,
107 COMP_EXP
108 } svx8_compression_type;
109
110 typedef struct IffDemuxContext {
111 int is_64bit; ///< chunk size is 64-bit
112 int64_t body_pos;
113 int64_t body_end;
114 int64_t sbdy_pos;
115 int64_t resume_pos;
116 uint32_t body_size;
117 svx8_compression_type svx8_compression;
118 unsigned maud_bits;
119 unsigned maud_compression;
120 unsigned bitmap_compression; ///< delta compression method used
121 unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
122 unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
123 unsigned flags; ///< 1 for EHB, 0 is no extra half darkening
124 unsigned transparency; ///< transparency color index in palette
125 unsigned masking; ///< masking method used
126 uint8_t tvdc[32]; ///< TVDC lookup table
127 uint32_t form_tag;
128 int audio_stream_index;
129 int video_stream_index;
130 } IffDemuxContext;
131
132 /* Metadata string read */
133 2 static int get_metadata(AVFormatContext *s,
134 const char *const tag,
135 const unsigned data_size)
136 {
137
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 2 uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
138
139
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 2 if (!buf)
140 ✗ return AVERROR(ENOMEM);
141
142
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 2 if (avio_read(s->pb, buf, data_size) != data_size) {
143 ✗ av_free(buf);
144 ✗ return AVERROR(EIO);
145 }
146 2 buf[data_size] = 0;
147 2 av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
148 2 return 0;
149 }
150
151 7204 static int iff_probe(const AVProbeData *p)
152 {
153 7204 const uint8_t *d = p->buf;
154
155
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 7204 if ( (AV_RL32(d) == ID_FORM &&
156
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 21 (AV_RL32(d+8) == ID_8SVX ||
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 20 AV_RL32(d+8) == ID_16SV ||
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 20 AV_RL32(d+8) == ID_MAUD ||
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 20 AV_RL32(d+8) == ID_PBM ||
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 19 AV_RL32(d+8) == ID_ACBM ||
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 19 AV_RL32(d+8) == ID_DEEP ||
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 19 AV_RL32(d+8) == ID_ILBM ||
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 18 AV_RL32(d+8) == ID_RGB8 ||
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 18 AV_RL32(d+8) == ID_ANIM ||
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 18 AV_RL32(d+8) == ID_RGBN)) ||
166
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 7201 (AV_RL32(d) == ID_FRM8 && AV_RL32(d+12) == ID_DSD))
167 4 return AVPROBE_SCORE_MAX;
168 7200 return 0;
169 }
170
171 static const AVCodecTag dsd_codec_tags[] = {
172 { AV_CODEC_ID_DSD_MSBF, ID_DSD },
173 { AV_CODEC_ID_DST, ID_DST },
174 { AV_CODEC_ID_NONE, 0 },
175 };
176
177
178 #define DSD_SLFT MKTAG('S','L','F','T')
179 #define DSD_SRGT MKTAG('S','R','G','T')
180 #define DSD_MLFT MKTAG('M','L','F','T')
181 #define DSD_MRGT MKTAG('M','R','G','T')
182 #define DSD_C MKTAG('C',' ',' ',' ')
183 #define DSD_LS MKTAG('L','S',' ',' ')
184 #define DSD_RS MKTAG('R','S',' ',' ')
185 #define DSD_LFE MKTAG('L','F','E',' ')
186
187 static const uint32_t dsd_stereo[] = { DSD_SLFT, DSD_SRGT };
188 static const uint32_t dsd_5point0[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LS, DSD_RS };
189 static const uint32_t dsd_5point1[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LFE, DSD_LS, DSD_RS };
190
191 typedef struct {
192 AVChannelLayout layout;
193 const uint32_t * dsd_layout;
194 } DSDLayoutDesc;
195
196 static const DSDLayoutDesc dsd_channel_layout[] = {
197 { AV_CHANNEL_LAYOUT_STEREO, dsd_stereo },
198 { AV_CHANNEL_LAYOUT_5POINT0, dsd_5point0 },
199 { AV_CHANNEL_LAYOUT_5POINT1, dsd_5point1 },
200 };
201
202 static const AVChannelLayout dsd_loudspeaker_config[] = {
203 AV_CHANNEL_LAYOUT_STEREO,
204 { 0 }, { 0 },
205 AV_CHANNEL_LAYOUT_5POINT0, AV_CHANNEL_LAYOUT_5POINT1,
206 };
207
208 static const char * dsd_source_comment[] = {
209 "dsd_source_comment",
210 "analogue_source_comment",
211 "pcm_source_comment",
212 };
213
214 static const char * dsd_history_comment[] = {
215 "general_remark",
216 "operator_name",
217 "creating_machine",
218 "timezone",
219 "file_revision"
220 };
221
222 ✗ static int parse_dsd_diin(AVFormatContext *s, AVStream *st, uint64_t eof)
223 {
224 ✗ AVIOContext *pb = s->pb;
225
226 ✗ while (av_sat_add64(avio_tell(pb), 12) <= eof && !avio_feof(pb)) {
227 ✗ uint32_t tag = avio_rl32(pb);
228 ✗ uint64_t size = avio_rb64(pb);
229 ✗ uint64_t orig_pos = avio_tell(pb);
230 ✗ const char * metadata_tag = NULL;
231
232 ✗ if (size >= INT64_MAX)
233 ✗ return AVERROR_INVALIDDATA;
234
235 ✗ switch(tag) {
236 ✗ case MKTAG('D','I','A','R'): metadata_tag = "artist"; break;
237 ✗ case MKTAG('D','I','T','I'): metadata_tag = "title"; break;
238 }
239
240 ✗ if (metadata_tag && size > 4) {
241 ✗ unsigned int tag_size = avio_rb32(pb);
242 ✗ int ret = get_metadata(s, metadata_tag, FFMIN(tag_size, size - 4));
243 ✗ if (ret < 0) {
244 ✗ av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
245 ✗ return ret;
246 }
247 }
248
249 ✗ avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
250 }
251
252 ✗ return 0;
253 }
254
255 1 static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)
256 {
257 1 AVIOContext *pb = s->pb;
258 char abss[24];
259 int hour, min, sec, i, ret, config;
260 int dsd_layout[6];
261 ID3v2ExtraMeta *id3v2_extra_meta;
262
263
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 4 while (av_sat_add64(avio_tell(pb), 12) <= eof && !avio_feof(pb)) {
264 3 uint32_t tag = avio_rl32(pb);
265 3 uint64_t size = avio_rb64(pb);
266 3 uint64_t orig_pos = avio_tell(pb);
267
268
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 3 if (size >= INT64_MAX)
269 ✗ return AVERROR_INVALIDDATA;
270
271
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 3 switch(tag) {
272 ✗ case MKTAG('A','B','S','S'):
273 ✗ if (size < 8)
274 ✗ return AVERROR_INVALIDDATA;
275 ✗ hour = avio_rb16(pb);
276 ✗ min = avio_r8(pb);
277 ✗ sec = avio_r8(pb);
278 ✗ snprintf(abss, sizeof(abss), "%02dh:%02dm:%02ds:%d", hour, min, sec, avio_rb32(pb));
279 ✗ av_dict_set(&st->metadata, "absolute_start_time", abss, 0);
280 ✗ break;
281
282 1 case MKTAG('C','H','N','L'):
283
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 1 if (size < 2)
284 ✗ return AVERROR_INVALIDDATA;
285 1 st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
286 1 st->codecpar->ch_layout.nb_channels = avio_rb16(pb);
287
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 1 if (size < 2 + st->codecpar->ch_layout.nb_channels * 4)
288 ✗ return AVERROR_INVALIDDATA;
289
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 1 if (st->codecpar->ch_layout.nb_channels > FF_ARRAY_ELEMS(dsd_layout)) {
290 ✗ avpriv_request_sample(s, "channel layout");
291 ✗ break;
292 }
293
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 3 for (i = 0; i < st->codecpar->ch_layout.nb_channels; i++)
294 2 dsd_layout[i] = avio_rl32(pb);
295
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 1 for (i = 0; i < FF_ARRAY_ELEMS(dsd_channel_layout); i++) {
296 1 const DSDLayoutDesc * d = &dsd_channel_layout[i];
297
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 1 if (d->layout.nb_channels == st->codecpar->ch_layout.nb_channels &&
298
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 1 !memcmp(d->dsd_layout, dsd_layout, d->layout.nb_channels * sizeof(uint32_t))) {
299 1 st->codecpar->ch_layout = d->layout;
300 1 break;
301 }
302 }
303 1 break;
304
305 1 case MKTAG('C','M','P','R'):
306
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 1 if (size < 4)
307 ✗ return AVERROR_INVALIDDATA;
308 1 st->codecpar->codec_tag = tag = avio_rl32(pb);
309 1 st->codecpar->codec_id = ff_codec_get_id(dsd_codec_tags, tag);
310
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 1 if (!st->codecpar->codec_id) {
311 ✗ av_log(s, AV_LOG_ERROR, "'%s' compression is not supported\n",
312 ✗ av_fourcc2str(tag));
313 ✗ return AVERROR_PATCHWELCOME;
314 }
315 1 break;
316
317 1 case MKTAG('F','S',' ',' '):
318
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 1 if (size < 4)
319 ✗ return AVERROR_INVALIDDATA;
320 1 st->codecpar->sample_rate = avio_rb32(pb) / 8;
321 1 break;
322
323 ✗ case MKTAG('I','D','3',' '):
324 ✗ ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
325 ✗ if (id3v2_extra_meta) {
326 ✗ if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0 ||
327 ✗ (ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0) {
328 ✗ ff_id3v2_free_extra_meta(&id3v2_extra_meta);
329 ✗ return ret;
330 }
331 ✗ ff_id3v2_free_extra_meta(&id3v2_extra_meta);
332 }
333
334 ✗ if (size < avio_tell(pb) - orig_pos) {
335 ✗ av_log(s, AV_LOG_ERROR, "id3 exceeds chunk size\n");
336 ✗ return AVERROR_INVALIDDATA;
337 }
338 ✗ break;
339
340 ✗ case MKTAG('L','S','C','O'):
341 ✗ if (size < 2)
342 ✗ return AVERROR_INVALIDDATA;
343 ✗ config = avio_rb16(pb);
344 ✗ if (config != 0xFFFF) {
345 ✗ if (config < FF_ARRAY_ELEMS(dsd_loudspeaker_config))
346 ✗ st->codecpar->ch_layout = dsd_loudspeaker_config[config];
347 ✗ if (!st->codecpar->ch_layout.nb_channels)
348 ✗ avpriv_request_sample(s, "loudspeaker configuration %d", config);
349 }
350 ✗ break;
351 }
352
353 3 avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
354 }
355
356 1 return 0;
357 }
358
359 11 static int read_dst_frame(AVFormatContext *s, AVPacket *pkt)
360 {
361 11 IffDemuxContext *iff = s->priv_data;
362 11 AVIOContext *pb = s->pb;
363 uint32_t chunk_id;
364 uint64_t chunk_pos, data_pos, data_size;
365 11 int ret = AVERROR_EOF;
366
367
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 11 if (s->nb_streams < 1)
368 ✗ return AVERROR_INVALIDDATA;
369
370
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 12 while (!avio_feof(pb)) {
371 12 chunk_pos = avio_tell(pb);
372
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 12 if (chunk_pos >= iff->body_end)
373 ✗ return AVERROR_EOF;
374
375 12 chunk_id = avio_rl32(pb);
376
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 12 data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);
377 12 data_pos = avio_tell(pb);
378
379
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 12 if (data_size < 1 || data_size >= INT64_MAX)
380 ✗ return AVERROR_INVALIDDATA;
381
382
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 12 switch (chunk_id) {
383 11 case ID_DSTF:
384
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 11 if (!pkt) {
385
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 1 iff->body_pos = avio_tell(pb) - (iff->is_64bit ? 12 : 8);
386 1 iff->body_size = iff->body_end - iff->body_pos;
387 1 return 0;
388 }
389 10 ret = av_get_packet(pb, pkt, data_size);
390
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 10 if (ret < 0)
391 ✗ return ret;
392
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 10 if (data_size & 1)
393 4 avio_skip(pb, 1);
394 10 pkt->flags |= AV_PKT_FLAG_KEY;
395 10 pkt->stream_index = iff->audio_stream_index;
396 10 pkt->duration = s->streams[0]->codecpar->sample_rate / 75;
397 10 pkt->pos = chunk_pos;
398
399 10 chunk_pos = avio_tell(pb);
400
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 10 if (chunk_pos >= iff->body_end)
401 1 return 0;
402
403 9 avio_seek(pb, chunk_pos, SEEK_SET);
404 9 return 0;
405
406 1 case ID_FRTE:
407
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 1 if (data_size < 4)
408 ✗ return AVERROR_INVALIDDATA;
409 1 s->streams[0]->duration = avio_rb32(pb) * (uint64_t)s->streams[0]->codecpar->sample_rate / 75;
410
411 1 break;
412 }
413
414 1 avio_skip(pb, data_size - (avio_tell(pb) - data_pos) + (data_size & 1));
415 }
416
417 ✗ return ret;
418 }
419
420 static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
421 static const uint8_t deep_rgba[] = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
422 static const uint8_t deep_bgra[] = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};
423 static const uint8_t deep_argb[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};
424 static const uint8_t deep_abgr[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};
425
426 4 static AVStream * new_stream(AVFormatContext *s, AVStream **st_ptr, int *index_ptr, enum AVMediaType codec_type)
427 {
428
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 4 if (!*st_ptr) {
429 4 *st_ptr = avformat_new_stream(s, NULL);
430
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 4 if (!*st_ptr)
431 ✗ return NULL;
432 4 (*st_ptr)->codecpar->codec_type = codec_type;
433 4 (*index_ptr) = (*st_ptr)->index;
434 }
435 4 return *st_ptr;
436 }
437
438 4 static int iff_read_header(AVFormatContext *s)
439 {
440 4 IffDemuxContext *iff = s->priv_data;
441 4 AVIOContext *pb = s->pb;
442 4 AVStream *sta = NULL, *stv = NULL;
443 uint8_t *buf;
444 uint32_t chunk_id;
445 uint64_t data_size;
446 4 uint32_t screenmode = 0, num, den;
447 4 unsigned transparency = 0;
448 4 unsigned masking = 0; // no mask
449 uint8_t fmt[16];
450 int fmt_size;
451
452 4 iff->audio_stream_index = -1;
453 4 iff->video_stream_index = -1;
454 4 iff->is_64bit = avio_rl32(pb) == ID_FRM8;
455
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 4 avio_skip(pb, iff->is_64bit ? 8 : 4);
456 4 iff->form_tag = avio_rl32(pb);
457
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 4 if (iff->form_tag == ID_ANIM) {
458 ✗ avio_skip(pb, 12);
459 }
460 4 iff->bitmap_compression = -1;
461 4 iff->svx8_compression = -1;
462 4 iff->maud_bits = -1;
463 4 iff->maud_compression = -1;
464
465
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 41 while(!avio_feof(pb)) {
466 uint64_t orig_pos;
467 int res;
468 37 const char *metadata_tag = NULL;
469 int version, nb_comments, i;
470 37 chunk_id = avio_rl32(pb);
471
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 37 data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);
472 37 orig_pos = avio_tell(pb);
473
474
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 37 if (data_size >= INT64_MAX)
475 ✗ return AVERROR_INVALIDDATA;
476
477
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 37 switch(chunk_id) {
478 1 case ID_VHDR:
479
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 1 if (data_size < 14)
480 ✗ return AVERROR_INVALIDDATA;
481
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 1 if (!new_stream(s, &sta, &iff->audio_stream_index, AVMEDIA_TYPE_AUDIO))
482 ✗ return AVERROR(ENOMEM);
483 1 avio_skip(pb, 12);
484 1 sta->codecpar->sample_rate = avio_rb16(pb);
485
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 1 if (data_size >= 16) {
486 1 avio_skip(pb, 1);
487 1 iff->svx8_compression = avio_r8(pb);
488 }
489 1 sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
490 14 break;
491
492 ✗ case ID_MHDR:
493 ✗ if (data_size < 32)
494 ✗ return AVERROR_INVALIDDATA;
495 ✗ if (!new_stream(s, &sta, &iff->audio_stream_index, AVMEDIA_TYPE_AUDIO))
496 ✗ return AVERROR(ENOMEM);
497 ✗ avio_skip(pb, 4);
498 ✗ iff->maud_bits = avio_rb16(pb);
499 ✗ avio_skip(pb, 2);
500 ✗ num = avio_rb32(pb);
501 ✗ den = avio_rb16(pb);
502 ✗ if (!den)
503 ✗ return AVERROR_INVALIDDATA;
504 ✗ avio_skip(pb, 2);
505 ✗ sta->codecpar->sample_rate = num / den;
506 ✗ sta->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
507 ✗ sta->codecpar->ch_layout.nb_channels = avio_rb16(pb);
508 ✗ iff->maud_compression = avio_rb16(pb);
509 ✗ if (sta->codecpar->ch_layout.nb_channels == 1)
510 ✗ sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
511 ✗ else if (sta->codecpar->ch_layout.nb_channels == 2)
512 ✗ sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
513 ✗ break;
514
515 4 case ID_ABIT:
516 case ID_BODY:
517 case ID_DBOD:
518 case ID_DSD:
519 case ID_DST:
520 case ID_MDAT:
521 4 iff->body_pos = avio_tell(pb);
522
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 4 if (iff->body_pos < 0 || iff->body_pos + data_size > INT64_MAX)
523 ✗ return AVERROR_INVALIDDATA;
524
525 4 iff->body_end = iff->body_pos + data_size;
526 4 iff->body_size = data_size;
527
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 4 if (chunk_id == ID_DST) {
528 1 int ret = read_dst_frame(s, NULL);
529
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 1 if (ret < 0)
530 ✗ return ret;
531 }
532 4 break;
533
534 ✗ case ID_CHAN:
535 ✗ if (data_size < 4)
536 ✗ return AVERROR_INVALIDDATA;
537 ✗ if (!sta)
538 ✗ return AVERROR_INVALIDDATA;
539 ✗ if (avio_rb32(pb) < 6) {
540 ✗ sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
541 } else {
542 ✗ sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
543 }
544 ✗ break;
545
546 1 case ID_CAMG:
547
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 1 if (data_size < 4)
548 ✗ return AVERROR_INVALIDDATA;
549 1 screenmode = avio_rb32(pb);
550 1 break;
551
552 2 case ID_CMAP:
553
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 2 if (data_size < 3 || data_size > 768 || data_size % 3) {
554 ✗ av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %"PRIu64"\n",
555 data_size);
556 ✗ return AVERROR_INVALIDDATA;
557 }
558
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 2 if (!stv)
559 ✗ return AVERROR_INVALIDDATA;
560 2 res = ff_alloc_extradata(stv->codecpar,
561 2 data_size + IFF_EXTRA_VIDEO_SIZE);
562
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 2 if (res < 0)
563 ✗ return res;
564
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 2 if (avio_read(pb, stv->codecpar->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0) {
565 ✗ av_freep(&stv->codecpar->extradata);
566 ✗ stv->codecpar->extradata_size = 0;
567 ✗ return AVERROR(EIO);
568 }
569 2 break;
570
571 2 case ID_BMHD:
572
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 2 if (data_size <= 8)
573 ✗ return AVERROR_INVALIDDATA;
574
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 2 if (!new_stream(s, &stv, &iff->video_stream_index, AVMEDIA_TYPE_VIDEO))
575 ✗ return AVERROR(ENOMEM);
576 2 stv->codecpar->width = avio_rb16(pb);
577 2 stv->codecpar->height = avio_rb16(pb);
578 2 avio_skip(pb, 4); // x, y offset
579 2 stv->codecpar->bits_per_coded_sample = avio_r8(pb);
580
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 2 if (data_size >= 10)
581 2 masking = avio_r8(pb);
582
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 2 if (data_size >= 11)
583 2 iff->bitmap_compression = avio_r8(pb);
584
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 2 if (data_size >= 14) {
585 2 avio_skip(pb, 1); // padding
586 2 transparency = avio_rb16(pb);
587 }
588
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 2 if (data_size >= 16) {
589 2 stv->sample_aspect_ratio.num = avio_r8(pb);
590 2 stv->sample_aspect_ratio.den = avio_r8(pb);
591 }
592 2 break;
593
594 ✗ case ID_ANHD:
595 ✗ break;
596
597 ✗ case ID_DPAN:
598 ✗ if (!stv)
599 ✗ return AVERROR_INVALIDDATA;
600 ✗ avio_skip(pb, 2);
601 ✗ stv->duration = avio_rb16(pb);
602 ✗ break;
603
604 ✗ case ID_DPEL:
605 ✗ if (data_size < 4 || (data_size & 3))
606 ✗ return AVERROR_INVALIDDATA;
607 ✗ if (!stv)
608 ✗ return AVERROR_INVALIDDATA;
609 ✗ if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)
610 ✗ return fmt_size;
611 ✗ if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))
612 ✗ stv->codecpar->format = AV_PIX_FMT_RGB24;
613 ✗ else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))
614 ✗ stv->codecpar->format = AV_PIX_FMT_RGBA;
615 ✗ else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))
616 ✗ stv->codecpar->format = AV_PIX_FMT_BGRA;
617 ✗ else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))
618 ✗ stv->codecpar->format = AV_PIX_FMT_ARGB;
619 ✗ else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))
620 ✗ stv->codecpar->format = AV_PIX_FMT_ABGR;
621 else {
622 ✗ avpriv_request_sample(s, "color format %.16s", fmt);
623 ✗ return AVERROR_PATCHWELCOME;
624 }
625 ✗ break;
626
627 ✗ case ID_DGBL:
628 ✗ if (data_size < 8)
629 ✗ return AVERROR_INVALIDDATA;
630 ✗ if (!new_stream(s, &stv, &iff->video_stream_index, AVMEDIA_TYPE_VIDEO))
631 ✗ return AVERROR(ENOMEM);
632 ✗ stv->codecpar->width = avio_rb16(pb);
633 ✗ stv->codecpar->height = avio_rb16(pb);
634 ✗ iff->bitmap_compression = avio_rb16(pb);
635 ✗ stv->sample_aspect_ratio.num = avio_r8(pb);
636 ✗ stv->sample_aspect_ratio.den = avio_r8(pb);
637 ✗ stv->codecpar->bits_per_coded_sample = 24;
638 ✗ break;
639
640 ✗ case ID_DLOC:
641 ✗ if (data_size < 4)
642 ✗ return AVERROR_INVALIDDATA;
643 ✗ if (!new_stream(s, &stv, &iff->video_stream_index, AVMEDIA_TYPE_VIDEO))
644 ✗ return AVERROR(ENOMEM);
645 ✗ stv->codecpar->width = avio_rb16(pb);
646 ✗ stv->codecpar->height = avio_rb16(pb);
647 ✗ break;
648
649 ✗ case ID_TVDC:
650 ✗ if (data_size < sizeof(iff->tvdc))
651 ✗ return AVERROR_INVALIDDATA;
652 ✗ res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));
653 ✗ if (res < 0)
654 ✗ return res;
655 ✗ break;
656
657 ✗ case MKTAG('S','X','H','D'):
658 ✗ if (data_size < 22)
659 ✗ return AVERROR_INVALIDDATA;
660 ✗ if (!new_stream(s, &sta, &iff->audio_stream_index, AVMEDIA_TYPE_AUDIO))
661 ✗ return AVERROR(ENOMEM);
662 ✗ sta->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
663 ✗ switch(avio_r8(pb)) {
664 ✗ case 8:
665 ✗ sta->codecpar->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
666 ✗ break;
667 ✗ default:
668 ✗ avpriv_request_sample(s, "sound bitdepth");
669 ✗ return AVERROR_INVALIDDATA;
670 }
671 ✗ avio_skip(pb, 9);
672 ✗ if (avio_rb32(pb)) {
673 ✗ avpriv_request_sample(s, "sound compression");
674 ✗ return AVERROR_INVALIDDATA;
675 }
676 ✗ avio_skip(pb, 1);
677 ✗ sta->codecpar->ch_layout.nb_channels = avio_r8(pb);
678 ✗ if (!sta->codecpar->ch_layout.nb_channels)
679 ✗ return AVERROR_INVALIDDATA;
680 ✗ if (sta->codecpar->ch_layout.nb_channels == 1)
681 ✗ sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
682 ✗ else if (sta->codecpar->ch_layout.nb_channels == 2)
683 ✗ sta->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
684 ✗ sta->codecpar->sample_rate = avio_rb32(pb);
685 ✗ avpriv_set_pts_info(sta, 64, 1, sta->codecpar->sample_rate);
686 ✗ avio_skip(pb, 2);
687 ✗ break;
688
689 1 case ID_ANNO:
690 1 case ID_TEXT: metadata_tag = "comment"; break;
691 ✗ case ID_AUTH: metadata_tag = "artist"; break;
692 ✗ case ID_COPYRIGHT: metadata_tag = "copyright"; break;
693 1 case ID_NAME: metadata_tag = "title"; break;
694
695 /* DSD tags */
696
697 1 case MKTAG('F','V','E','R'):
698
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 1 if (iff->form_tag == ID_DSD || iff->form_tag == ID_DST) {
699
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 1 if (data_size < 4)
700 ✗ return AVERROR_INVALIDDATA;
701 1 version = avio_rb32(pb);
702 1 av_log(s, AV_LOG_DEBUG, "DSIFF v%d.%d.%d.%d\n",version >> 24, (version >> 16) & 0xFF, (version >> 8) & 0xFF, version & 0xFF);
703
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 1 if (!new_stream(s, &sta, &iff->audio_stream_index, AVMEDIA_TYPE_AUDIO))
704 ✗ return AVERROR(ENOMEM);
705 1 sta->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
706 }
707 1 break;
708
709 ✗ case MKTAG('D','I','I','N'):
710 ✗ if (!sta)
711 ✗ return AVERROR_INVALIDDATA;
712 ✗ res = parse_dsd_diin(s, sta, orig_pos + data_size);
713 ✗ if (res < 0)
714 ✗ return res;
715 ✗ break;
716
717 1 case MKTAG('P','R','O','P'):
718
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 1 if (data_size < 4)
719 ✗ return AVERROR_INVALIDDATA;
720
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 1 if (avio_rl32(pb) != MKTAG('S','N','D',' ')) {
721 ✗ avpriv_request_sample(s, "unknown property type");
722 ✗ break;
723 }
724
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 1 if (!sta)
725 ✗ return AVERROR_INVALIDDATA;
726 1 res = parse_dsd_prop(s, sta, orig_pos + data_size);
727
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 1 if (res < 0)
728 ✗ return res;
729 1 break;
730
731 ✗ case MKTAG('C','O','M','T'):
732 ✗ if (data_size < 2)
733 ✗ return AVERROR_INVALIDDATA;
734 ✗ if (!sta)
735 ✗ return AVERROR_INVALIDDATA;
736 ✗ nb_comments = avio_rb16(pb);
737 ✗ for (i = 0; i < nb_comments; i++) {
738 int year, mon, day, hour, min, type, ref;
739 char tmp[24];
740 const char *tag;
741 int metadata_size;
742
743 ✗ year = avio_rb16(pb);
744 ✗ mon = avio_r8(pb);
745 ✗ day = avio_r8(pb);
746 ✗ hour = avio_r8(pb);
747 ✗ min = avio_r8(pb);
748 ✗ snprintf(tmp, sizeof(tmp), "%04d-%02d-%02d %02d:%02d", year, mon, day, hour, min);
749 ✗ av_dict_set(&sta->metadata, "comment_time", tmp, 0);
750
751 ✗ type = avio_rb16(pb);
752 ✗ ref = avio_rb16(pb);
753 ✗ switch (type) {
754 ✗ case 1:
755 ✗ if (!i)
756 ✗ tag = "channel_comment";
757 else {
758 ✗ snprintf(tmp, sizeof(tmp), "channel%d_comment", ref);
759 ✗ tag = tmp;
760 }
761 ✗ break;
762 ✗ case 2:
763 ✗ tag = ref < FF_ARRAY_ELEMS(dsd_source_comment) ? dsd_source_comment[ref] : "source_comment";
764 ✗ break;
765 ✗ case 3:
766 ✗ tag = ref < FF_ARRAY_ELEMS(dsd_history_comment) ? dsd_history_comment[ref] : "file_history";
767 ✗ break;
768 ✗ default:
769 ✗ tag = "comment";
770 }
771
772 ✗ metadata_size = avio_rb32(pb);
773 ✗ if ((res = get_metadata(s, tag, metadata_size)) < 0) {
774 ✗ av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", tag);
775 ✗ return res;
776 }
777
778 ✗ if (metadata_size & 1)
779 ✗ avio_skip(pb, 1);
780 }
781 ✗ break;
782 }
783
784
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 37 if (metadata_tag) {
785
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 2 if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
786 ✗ av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
787 ✗ return res;
788 }
789 }
790 37 avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
791 }
792
793
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 4 if ((!sta && !stv) ||
794
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 4 (iff->form_tag == ID_ANIM && !stv) ||
795
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 4 (iff->form_tag != ID_ANIM && sta && stv))
796 ✗ return AVERROR_INVALIDDATA;
797
798
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 4 if (iff->form_tag == ID_ANIM)
799 ✗ avio_seek(pb, 12, SEEK_SET);
800 else
801 4 avio_seek(pb, iff->body_pos, SEEK_SET);
802
803
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 4 if (sta) {
804 2 avpriv_set_pts_info(sta, 32, 1, sta->codecpar->sample_rate);
805
806
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 2 if (sta->codecpar->codec_id != AV_CODEC_ID_NONE) {
807 /* codec_id already set by PROP or SXHD chunk */
808
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 1 } else if (iff->form_tag == ID_16SV)
809 ✗ sta->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;
810
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 1 else if (iff->form_tag == ID_MAUD) {
811 ✗ if (iff->maud_bits == 8 && !iff->maud_compression) {
812 ✗ sta->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
813 ✗ } else if (iff->maud_bits == 16 && !iff->maud_compression) {
814 ✗ sta->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
815 ✗ } else if (iff->maud_bits == 8 && iff->maud_compression == 2) {
816 ✗ sta->codecpar->codec_id = AV_CODEC_ID_PCM_ALAW;
817 ✗ } else if (iff->maud_bits == 8 && iff->maud_compression == 3) {
818 ✗ sta->codecpar->codec_id = AV_CODEC_ID_PCM_MULAW;
819 } else {
820 ✗ avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);
821 ✗ return AVERROR_PATCHWELCOME;
822 }
823 } else {
824
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 1 switch (iff->svx8_compression) {
825 ✗ case COMP_NONE:
826 ✗ sta->codecpar->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
827 ✗ break;
828 1 case COMP_FIB:
829 1 sta->codecpar->codec_id = AV_CODEC_ID_8SVX_FIB;
830 1 break;
831 ✗ case COMP_EXP:
832 ✗ sta->codecpar->codec_id = AV_CODEC_ID_8SVX_EXP;
833 ✗ break;
834 ✗ default:
835 ✗ av_log(s, AV_LOG_ERROR,
836 ✗ "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
837 ✗ return -1;
838 }
839 }
840
841 2 sta->codecpar->bits_per_coded_sample = av_get_bits_per_sample(sta->codecpar->codec_id);
842 2 sta->codecpar->bit_rate = (int64_t)sta->codecpar->ch_layout.nb_channels *
843 2 sta->codecpar->sample_rate *
844 2 sta->codecpar->bits_per_coded_sample;
845 2 sta->codecpar->block_align = sta->codecpar->ch_layout.nb_channels *
846 2 sta->codecpar->bits_per_coded_sample;
847
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 2 if ((sta->codecpar->codec_tag == ID_DSD || iff->form_tag == ID_MAUD) && sta->codecpar->block_align <= 0)
848 ✗ return AVERROR_INVALIDDATA;
849 }
850
851
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 4 if (stv) {
852 2 iff->bpp = stv->codecpar->bits_per_coded_sample;
853
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 2 if (iff->form_tag == ID_ANIM)
854 ✗ avpriv_set_pts_info(stv, 32, 1, 60);
855
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 2 if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
856 ✗ iff->ham = iff->bpp > 6 ? 6 : 4;
857 ✗ stv->codecpar->bits_per_coded_sample = 24;
858 }
859
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 2 iff->flags = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
860 2 iff->masking = masking;
861 2 iff->transparency = transparency;
862
863
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 2 if (!stv->codecpar->extradata) {
864 ✗ int ret = ff_alloc_extradata(stv->codecpar, IFF_EXTRA_VIDEO_SIZE);
865 ✗ if (ret < 0)
866 ✗ return ret;
867 }
868
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 2 av_assert0(stv->codecpar->extradata_size >= IFF_EXTRA_VIDEO_SIZE);
869 2 buf = stv->codecpar->extradata;
870 2 bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
871 2 bytestream_put_byte(&buf, iff->bitmap_compression);
872 2 bytestream_put_byte(&buf, iff->bpp);
873 2 bytestream_put_byte(&buf, iff->ham);
874 2 bytestream_put_byte(&buf, iff->flags);
875 2 bytestream_put_be16(&buf, iff->transparency);
876 2 bytestream_put_byte(&buf, iff->masking);
877 2 bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));
878 2 stv->codecpar->codec_id = AV_CODEC_ID_IFF_ILBM;
879 2 stv->codecpar->codec_tag = iff->form_tag; // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
880 }
881
882 4 return 0;
883 }
884
885 ✗ static unsigned get_anim_duration(uint8_t *buf, int size)
886 {
887 GetByteContext gb;
888
889 ✗ bytestream2_init(&gb, buf, size);
890 ✗ bytestream2_skip(&gb, 4);
891 ✗ while (bytestream2_get_bytes_left(&gb) > 8) {
892 ✗ unsigned chunk = bytestream2_get_le32(&gb);
893 ✗ unsigned size = bytestream2_get_be32(&gb);
894
895 ✗ if (chunk == ID_ANHD) {
896 ✗ if (size < 40)
897 ✗ break;
898 ✗ bytestream2_skip(&gb, 14);
899 ✗ return bytestream2_get_be32(&gb);
900 } else {
901 ✗ bytestream2_skip(&gb, size + size & 1);
902 }
903 }
904 ✗ return 10;
905 }
906
907 ✗ static int64_t get_sbdy_offset(uint8_t *buf, int size)
908 {
909 GetByteContext gb;
910
911 ✗ bytestream2_init(&gb, buf, size);
912 ✗ bytestream2_skip(&gb, 4);
913 ✗ while (bytestream2_get_bytes_left(&gb) > 8) {
914 ✗ unsigned chunk = bytestream2_get_le32(&gb);
915 ✗ unsigned size = bytestream2_get_be32(&gb);
916
917 ✗ if (chunk == MKTAG('S','B','D','Y'))
918 ✗ return bytestream2_tell(&gb);
919
920 ✗ bytestream2_skip(&gb, size + size & 1);
921 }
922
923 ✗ return 0;
924 }
925
926 21 static int iff_read_packet(AVFormatContext *s,
927 AVPacket *pkt)
928 {
929 21 IffDemuxContext *iff = s->priv_data;
930 21 AVIOContext *pb = s->pb;
931 int ret;
932 21 int64_t pos = avio_tell(pb);
933
934
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 21 if (avio_feof(pb))
935 ✗ return AVERROR_EOF;
936
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 21 if (iff->form_tag != ID_ANIM && pos >= iff->body_end)
937 8 return AVERROR_EOF;
938
939
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 13 if (iff->sbdy_pos) {
940 int64_t data_size;
941 ✗ avio_seek(pb, iff->sbdy_pos, SEEK_SET);
942 ✗ data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);
943 ✗ ret = av_get_packet(pb, pkt, data_size);
944 ✗ pkt->stream_index = iff->audio_stream_index;
945 ✗ pkt->duration = data_size / s->streams[iff->audio_stream_index]->codecpar->ch_layout.nb_channels;
946 ✗ pkt->pos = INT_MAX; /* not seekable */
947
948 ✗ iff->sbdy_pos = 0;
949 ✗ avio_seek(pb, iff->resume_pos, SEEK_SET);
950 ✗ return ret;
951 }
952
953
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 13 if (iff->audio_stream_index >= 0 && iff->video_stream_index < 0) { /* audio only */
954 11 AVStream *sta = s->streams[iff->audio_stream_index];
955
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 11 if (sta->codecpar->codec_tag == ID_DSD || iff->form_tag == ID_MAUD) {
956 ✗ ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * sta->codecpar->block_align));
957
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 11 } else if (sta->codecpar->codec_tag == ID_DST) {
958 10 return read_dst_frame(s, pkt);
959 } else {
960
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 1 if (iff->body_size > INT_MAX || !iff->body_size)
961 ✗ return AVERROR_INVALIDDATA;
962 1 ret = av_get_packet(pb, pkt, iff->body_size);
963 }
964 1 pkt->stream_index = iff->audio_stream_index;
965
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 2 } else if (iff->form_tag == ID_ANIM) {
966 uint64_t data_size, orig_pos;
967 uint32_t chunk_id, chunk_id2;
968
969 ✗ while (!avio_feof(pb)) {
970 ✗ if (avio_feof(pb))
971 ✗ return AVERROR_EOF;
972
973 ✗ orig_pos = avio_tell(pb);
974 ✗ chunk_id = avio_rl32(pb);
975 ✗ data_size = avio_rb32(pb);
976 ✗ chunk_id2 = avio_rl32(pb);
977
978 ✗ if (chunk_id == ID_FORM &&
979 chunk_id2 == ID_ILBM) {
980 ✗ avio_skip(pb, -4);
981 ✗ break;
982 ✗ } else if (chunk_id == ID_FORM &&
983 chunk_id2 == ID_ANIM) {
984 ✗ continue;
985 } else {
986 ✗ avio_skip(pb, data_size);
987 }
988 }
989 ✗ ret = av_get_packet(pb, pkt, data_size);
990 ✗ pkt->stream_index = iff->video_stream_index;
991 ✗ pkt->pos = orig_pos;
992 ✗ pkt->duration = get_anim_duration(pkt->data, pkt->size);
993 ✗ if (pos == 12)
994 ✗ pkt->flags |= AV_PKT_FLAG_KEY;
995
996 ✗ if (iff->audio_stream_index >= 0) {
997 ✗ iff->sbdy_pos = get_sbdy_offset(pkt->data, pkt->size);
998 ✗ if (iff->sbdy_pos) {
999 ✗ iff->sbdy_pos += orig_pos + 4;
1000 ✗ iff->resume_pos = avio_tell(pb);
1001 }
1002 }
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 2 } else if (iff->video_stream_index >= 0 && iff->audio_stream_index < 0) { /* video only */
1004
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 2 if (iff->body_size > INT_MAX || !iff->body_size)
1005 ✗ return AVERROR_INVALIDDATA;
1006 2 ret = av_get_packet(pb, pkt, iff->body_size);
1007 2 pkt->stream_index = iff->video_stream_index;
1008 2 pkt->pos = pos;
1009
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 2 if (pos == iff->body_pos)
1010 2 pkt->flags |= AV_PKT_FLAG_KEY;
1011 } else {
1012 ✗ av_assert0(0);
1013 }
1014
1015 3 return ret;
1016 }
1017
1018 const FFInputFormat ff_iff_demuxer = {
1019 .p.name = "iff",
1020 .p.long_name = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),
1021 .p.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
1022 .priv_data_size = sizeof(IffDemuxContext),
1023 .read_probe = iff_probe,
1024 .read_header = iff_read_header,
1025 .read_packet = iff_read_packet,
1026 };
1027