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iff.c
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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 "libavcodec/bytestream.h"
38 #include "avformat.h"
39 #include "id3v2.h"
40 #include "internal.h"
41 
42 #define ID_8SVX MKTAG('8','S','V','X')
43 #define ID_16SV MKTAG('1','6','S','V')
44 #define ID_MAUD MKTAG('M','A','U','D')
45 #define ID_MHDR MKTAG('M','H','D','R')
46 #define ID_MDAT MKTAG('M','D','A','T')
47 #define ID_VHDR MKTAG('V','H','D','R')
48 #define ID_ATAK MKTAG('A','T','A','K')
49 #define ID_RLSE MKTAG('R','L','S','E')
50 #define ID_CHAN MKTAG('C','H','A','N')
51 #define ID_PBM MKTAG('P','B','M',' ')
52 #define ID_ILBM MKTAG('I','L','B','M')
53 #define ID_BMHD MKTAG('B','M','H','D')
54 #define ID_DGBL MKTAG('D','G','B','L')
55 #define ID_CAMG MKTAG('C','A','M','G')
56 #define ID_CMAP MKTAG('C','M','A','P')
57 #define ID_ACBM MKTAG('A','C','B','M')
58 #define ID_DEEP MKTAG('D','E','E','P')
59 #define ID_RGB8 MKTAG('R','G','B','8')
60 #define ID_RGBN MKTAG('R','G','B','N')
61 #define ID_DSD MKTAG('D','S','D',' ')
62 #define ID_ANIM MKTAG('A','N','I','M')
63 
64 #define ID_FORM MKTAG('F','O','R','M')
65 #define ID_FRM8 MKTAG('F','R','M','8')
66 #define ID_ANNO MKTAG('A','N','N','O')
67 #define ID_AUTH MKTAG('A','U','T','H')
68 #define ID_CHRS MKTAG('C','H','R','S')
69 #define ID_COPYRIGHT MKTAG('(','c',')',' ')
70 #define ID_CSET MKTAG('C','S','E','T')
71 #define ID_FVER MKTAG('F','V','E','R')
72 #define ID_NAME MKTAG('N','A','M','E')
73 #define ID_TEXT MKTAG('T','E','X','T')
74 #define ID_ABIT MKTAG('A','B','I','T')
75 #define ID_BODY MKTAG('B','O','D','Y')
76 #define ID_DBOD MKTAG('D','B','O','D')
77 #define ID_DPEL MKTAG('D','P','E','L')
78 #define ID_DLOC MKTAG('D','L','O','C')
79 #define ID_TVDC MKTAG('T','V','D','C')
80 
81 #define LEFT 2
82 #define RIGHT 4
83 #define STEREO 6
84 
85 /**
86  * This number of bytes if added at the beginning of each AVPacket
87  * which contain additional information about video properties
88  * which has to be shared between demuxer and decoder.
89  * This number may change between frames, e.g. the demuxer might
90  * set it to smallest possible size of 2 to indicate that there's
91  * no extradata changing in this frame.
92  */
93 #define IFF_EXTRA_VIDEO_SIZE 41
94 
95 typedef enum {
96  COMP_NONE,
97  COMP_FIB,
98  COMP_EXP
99 } svx8_compression_type;
100 
101 typedef struct {
102  int is_64bit; ///< chunk size is 64-bit
103  int64_t body_pos;
104  int64_t body_end;
105  uint32_t body_size;
106  svx8_compression_type svx8_compression;
107  unsigned maud_bits;
108  unsigned maud_compression;
109  unsigned bitmap_compression; ///< delta compression method used
110  unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
111  unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
112  unsigned flags; ///< 1 for EHB, 0 is no extra half darkening
113  unsigned transparency; ///< transparency color index in palette
114  unsigned masking; ///< masking method used
115  uint8_t tvdc[32]; ///< TVDC lookup table
116 } IffDemuxContext;
117 
118 /* Metadata string read */
119 static int get_metadata(AVFormatContext *s,
120  const char *const tag,
121  const unsigned data_size)
122 {
123  uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
124 
125  if (!buf)
126  return AVERROR(ENOMEM);
127 
128  if (avio_read(s->pb, buf, data_size) != data_size) {
129  av_free(buf);
130  return AVERROR(EIO);
131  }
132  buf[data_size] = 0;
133  av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
134  return 0;
135 }
136 
137 static int iff_probe(AVProbeData *p)
138 {
139  const uint8_t *d = p->buf;
140 
141  if ( (AV_RL32(d) == ID_FORM &&
142  (AV_RL32(d+8) == ID_8SVX ||
143  AV_RL32(d+8) == ID_16SV ||
144  AV_RL32(d+8) == ID_MAUD ||
145  AV_RL32(d+8) == ID_PBM ||
146  AV_RL32(d+8) == ID_ACBM ||
147  AV_RL32(d+8) == ID_DEEP ||
148  AV_RL32(d+8) == ID_ILBM ||
149  AV_RL32(d+8) == ID_RGB8 ||
150  AV_RL32(d+8) == ID_RGB8 ||
151  AV_RL32(d+8) == ID_ANIM ||
152  AV_RL32(d+8) == ID_RGBN)) ||
153  (AV_RL32(d) == ID_FRM8 && AV_RL32(d+12) == ID_DSD))
154  return AVPROBE_SCORE_MAX;
155  return 0;
156 }
157 
158 static const AVCodecTag dsd_codec_tags[] = {
159  { AV_CODEC_ID_DSD_MSBF, ID_DSD },
160  { AV_CODEC_ID_NONE, 0 },
161 };
162 
163 
164 #define DSD_SLFT MKTAG('S','L','F','T')
165 #define DSD_SRGT MKTAG('S','R','G','T')
166 #define DSD_MLFT MKTAG('M','L','F','T')
167 #define DSD_MRGT MKTAG('M','R','G','T')
168 #define DSD_C MKTAG('C',' ',' ',' ')
169 #define DSD_LS MKTAG('L','S',' ',' ')
170 #define DSD_RS MKTAG('R','S',' ',' ')
171 #define DSD_LFE MKTAG('L','F','E',' ')
172 
173 static const uint32_t dsd_stereo[] = { DSD_SLFT, DSD_SRGT };
174 static const uint32_t dsd_5point0[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LS, DSD_RS };
175 static const uint32_t dsd_5point1[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LFE, DSD_LS, DSD_RS };
176 
177 typedef struct {
178  uint64_t layout;
179  const uint32_t * dsd_layout;
180 } DSDLayoutDesc;
181 
182 static const DSDLayoutDesc dsd_channel_layout[] = {
183  { AV_CH_LAYOUT_STEREO, dsd_stereo },
184  { AV_CH_LAYOUT_5POINT0, dsd_5point0 },
185  { AV_CH_LAYOUT_5POINT1, dsd_5point1 },
186 };
187 
188 static const uint64_t dsd_loudspeaker_config[] = {
189  AV_CH_LAYOUT_STEREO,
190  0, 0,
191  AV_CH_LAYOUT_5POINT0, AV_CH_LAYOUT_5POINT1,
192 };
193 
194 static const char * dsd_source_comment[] = {
195  "dsd_source_comment",
196  "analogue_source_comment",
197  "pcm_source_comment",
198 };
199 
200 static const char * dsd_history_comment[] = {
201  "general_remark",
202  "operator_name",
203  "creating_machine",
204  "timezone",
205  "file_revision"
206 };
207 
208 static int parse_dsd_diin(AVFormatContext *s, AVStream *st, uint64_t eof)
209 {
210  AVIOContext *pb = s->pb;
211 
212  while (avio_tell(pb) + 12 <= eof) {
213  uint32_t tag = avio_rl32(pb);
214  uint64_t size = avio_rb64(pb);
215  uint64_t orig_pos = avio_tell(pb);
216  const char * metadata_tag = NULL;
217 
218  switch(tag) {
219  case MKTAG('D','I','A','R'): metadata_tag = "artist"; break;
220  case MKTAG('D','I','T','I'): metadata_tag = "title"; break;
221  }
222 
223  if (metadata_tag && size > 4) {
224  unsigned int tag_size = avio_rb32(pb);
225  int ret = get_metadata(s, metadata_tag, FFMIN(tag_size, size - 4));
226  if (ret < 0) {
227  av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
228  return ret;
229  }
230  }
231 
232  avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
233  }
234 
235  return 0;
236 }
237 
238 static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)
239 {
240  AVIOContext *pb = s->pb;
241  char abss[24];
242  int hour, min, sec, i, ret, config;
243  int dsd_layout[6];
244  ID3v2ExtraMeta *id3v2_extra_meta;
245 
246  while (avio_tell(pb) + 12 <= eof) {
247  uint32_t tag = avio_rl32(pb);
248  uint64_t size = avio_rb64(pb);
249  uint64_t orig_pos = avio_tell(pb);
250 
251  switch(tag) {
252  case MKTAG('A','B','S','S'):
253  if (size < 8)
254  return AVERROR_INVALIDDATA;
255  hour = avio_rb16(pb);
256  min = avio_r8(pb);
257  sec = avio_r8(pb);
258  snprintf(abss, sizeof(abss), "%02dh:%02dm:%02ds:%d", hour, min, sec, avio_rb32(pb));
259  av_dict_set(&st->metadata, "absolute_start_time", abss, 0);
260  break;
261 
262  case MKTAG('C','H','N','L'):
263  if (size < 2)
264  return AVERROR_INVALIDDATA;
265  st->codec->channels = avio_rb16(pb);
266  if (size < 2 + st->codec->channels * 4)
267  return AVERROR_INVALIDDATA;
268  st->codec->channel_layout = 0;
269  if (st->codec->channels > FF_ARRAY_ELEMS(dsd_layout)) {
270  avpriv_request_sample(s, "channel layout");
271  break;
272  }
273  for (i = 0; i < st->codec->channels; i++)
274  dsd_layout[i] = avio_rl32(pb);
275  for (i = 0; i < FF_ARRAY_ELEMS(dsd_channel_layout); i++) {
276  const DSDLayoutDesc * d = &dsd_channel_layout[i];
277  if (av_get_channel_layout_nb_channels(d->layout) == st->codec->channels &&
278  !memcmp(d->dsd_layout, dsd_layout, st->codec->channels * sizeof(uint32_t))) {
279  st->codec->channel_layout = d->layout;
280  break;
281  }
282  }
283  break;
284 
285  case MKTAG('C','M','P','R'):
286  if (size < 4)
287  return AVERROR_INVALIDDATA;
288  st->codec->codec_id = ff_codec_get_id(dsd_codec_tags, avio_rl32(pb));
289  break;
290 
291  case MKTAG('F','S',' ',' '):
292  if (size < 4)
293  return AVERROR_INVALIDDATA;
294  st->codec->sample_rate = avio_rb32(pb) / 8;
295  break;
296 
297  case MKTAG('I','D','3',' '):
298  id3v2_extra_meta = NULL;
299  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
300  if (id3v2_extra_meta) {
301  if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
302  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
303  return ret;
304  }
305  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
306  }
307 
308  if (size < avio_tell(pb) - orig_pos) {
309  av_log(s, AV_LOG_ERROR, "id3 exceeds chunk size\n");
310  return AVERROR_INVALIDDATA;
311  }
312  break;
313 
314  case MKTAG('L','S','C','O'):
315  if (size < 2)
316  return AVERROR_INVALIDDATA;
317  config = avio_rb16(pb);
318  if (config != 0xFFFF) {
319  if (config < FF_ARRAY_ELEMS(dsd_loudspeaker_config))
320  st->codec->channel_layout = dsd_loudspeaker_config[config];
321  if (!st->codec->channel_layout)
322  avpriv_request_sample(s, "loudspeaker configuration %d", config);
323  }
324  break;
325  }
326 
327  avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
328  }
329 
330  return 0;
331 }
332 
333 static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
334 static const uint8_t deep_rgba[] = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
335 static const uint8_t deep_bgra[] = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};
336 static const uint8_t deep_argb[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};
337 static const uint8_t deep_abgr[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};
338 
339 static int iff_read_header(AVFormatContext *s)
340 {
341  IffDemuxContext *iff = s->priv_data;
342  AVIOContext *pb = s->pb;
343  AVStream *st;
344  uint8_t *buf;
345  uint32_t chunk_id;
346  uint64_t data_size;
347  uint32_t screenmode = 0, num, den;
348  unsigned transparency = 0;
349  unsigned masking = 0; // no mask
350  uint8_t fmt[16];
351  int fmt_size;
352 
353  st = avformat_new_stream(s, NULL);
354  if (!st)
355  return AVERROR(ENOMEM);
356 
357  st->codec->channels = 1;
358  st->codec->channel_layout = AV_CH_LAYOUT_MONO;
359  iff->is_64bit = avio_rl32(pb) == ID_FRM8;
360  avio_skip(pb, iff->is_64bit ? 8 : 4);
361  // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
362  st->codec->codec_tag = avio_rl32(pb);
363  if (st->codec->codec_tag == ID_ANIM) {
364  avio_skip(pb, 8);
365  st->codec->codec_tag = avio_rl32(pb);
366  }
367  iff->bitmap_compression = -1;
368  iff->svx8_compression = -1;
369  iff->maud_bits = -1;
370  iff->maud_compression = -1;
371 
372  while(!avio_feof(pb)) {
373  uint64_t orig_pos;
374  int res;
375  const char *metadata_tag = NULL;
376  int version, nb_comments, i;
377  chunk_id = avio_rl32(pb);
378  data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);
379  orig_pos = avio_tell(pb);
380 
381  switch(chunk_id) {
382  case ID_VHDR:
383  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
384 
385  if (data_size < 14)
386  return AVERROR_INVALIDDATA;
387  avio_skip(pb, 12);
388  st->codec->sample_rate = avio_rb16(pb);
389  if (data_size >= 16) {
390  avio_skip(pb, 1);
391  iff->svx8_compression = avio_r8(pb);
392  }
393  break;
394 
395  case ID_MHDR:
396  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
397 
398  if (data_size < 32)
399  return AVERROR_INVALIDDATA;
400  avio_skip(pb, 4);
401  iff->maud_bits = avio_rb16(pb);
402  avio_skip(pb, 2);
403  num = avio_rb32(pb);
404  den = avio_rb16(pb);
405  if (!den)
406  return AVERROR_INVALIDDATA;
407  avio_skip(pb, 2);
408  st->codec->sample_rate = num / den;
409  st->codec->channels = avio_rb16(pb);
410  iff->maud_compression = avio_rb16(pb);
411  if (st->codec->channels == 1)
412  st->codec->channel_layout = AV_CH_LAYOUT_MONO;
413  else if (st->codec->channels == 2)
414  st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
415  break;
416 
417  case ID_ABIT:
418  case ID_BODY:
419  case ID_DBOD:
420  case ID_DSD:
421  case ID_MDAT:
422  iff->body_pos = avio_tell(pb);
423  iff->body_end = iff->body_pos + data_size;
424  iff->body_size = data_size;
425  break;
426 
427  case ID_CHAN:
428  if (data_size < 4)
429  return AVERROR_INVALIDDATA;
430  if (avio_rb32(pb) < 6) {
431  st->codec->channels = 1;
432  st->codec->channel_layout = AV_CH_LAYOUT_MONO;
433  } else {
434  st->codec->channels = 2;
435  st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
436  }
437  break;
438 
439  case ID_CAMG:
440  if (data_size < 4)
441  return AVERROR_INVALIDDATA;
442  screenmode = avio_rb32(pb);
443  break;
444 
445  case ID_CMAP:
446  if (data_size < 3 || data_size > 768 || data_size % 3) {
447  av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %"PRIu64"\n",
448  data_size);
449  return AVERROR_INVALIDDATA;
450  }
451  st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
452  st->codec->extradata = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
453  if (!st->codec->extradata)
454  return AVERROR(ENOMEM);
455  if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)
456  return AVERROR(EIO);
457  break;
458 
459  case ID_BMHD:
460  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
461  if (data_size <= 8)
462  return AVERROR_INVALIDDATA;
463  st->codec->width = avio_rb16(pb);
464  st->codec->height = avio_rb16(pb);
465  avio_skip(pb, 4); // x, y offset
466  st->codec->bits_per_coded_sample = avio_r8(pb);
467  if (data_size >= 10)
468  masking = avio_r8(pb);
469  if (data_size >= 11)
470  iff->bitmap_compression = avio_r8(pb);
471  if (data_size >= 14) {
472  avio_skip(pb, 1); // padding
473  transparency = avio_rb16(pb);
474  }
475  if (data_size >= 16) {
476  st->sample_aspect_ratio.num = avio_r8(pb);
477  st->sample_aspect_ratio.den = avio_r8(pb);
478  }
479  break;
480 
481  case ID_DPEL:
482  if (data_size < 4 || (data_size & 3))
483  return AVERROR_INVALIDDATA;
484  if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)
485  return fmt_size;
486  if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))
487  st->codec->pix_fmt = AV_PIX_FMT_RGB24;
488  else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))
489  st->codec->pix_fmt = AV_PIX_FMT_RGBA;
490  else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))
491  st->codec->pix_fmt = AV_PIX_FMT_BGRA;
492  else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))
493  st->codec->pix_fmt = AV_PIX_FMT_ARGB;
494  else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))
495  st->codec->pix_fmt = AV_PIX_FMT_ABGR;
496  else {
497  avpriv_request_sample(s, "color format %.16s", fmt);
498  return AVERROR_PATCHWELCOME;
499  }
500  break;
501 
502  case ID_DGBL:
503  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
504  if (data_size < 8)
505  return AVERROR_INVALIDDATA;
506  st->codec->width = avio_rb16(pb);
507  st->codec->height = avio_rb16(pb);
508  iff->bitmap_compression = avio_rb16(pb);
509  st->sample_aspect_ratio.num = avio_r8(pb);
510  st->sample_aspect_ratio.den = avio_r8(pb);
511  st->codec->bits_per_coded_sample = 24;
512  break;
513 
514  case ID_DLOC:
515  if (data_size < 4)
516  return AVERROR_INVALIDDATA;
517  st->codec->width = avio_rb16(pb);
518  st->codec->height = avio_rb16(pb);
519  break;
520 
521  case ID_TVDC:
522  if (data_size < sizeof(iff->tvdc))
523  return AVERROR_INVALIDDATA;
524  res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));
525  if (res < 0)
526  return res;
527  break;
528 
529  case ID_ANNO:
530  case ID_TEXT: metadata_tag = "comment"; break;
531  case ID_AUTH: metadata_tag = "artist"; break;
532  case ID_COPYRIGHT: metadata_tag = "copyright"; break;
533  case ID_NAME: metadata_tag = "title"; break;
534 
535  /* DSD tags */
536 
537  case MKTAG('F','V','E','R'):
538  if (data_size < 4)
539  return AVERROR_INVALIDDATA;
540  version = avio_rb32(pb);
541  av_log(s, AV_LOG_DEBUG, "DSIFF v%d.%d.%d.%d\n",version >> 24, (version >> 16) & 0xFF, (version >> 8) & 0xFF, version & 0xFF);
542  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
543  break;
544 
545  case MKTAG('D','I','I','N'):
546  res = parse_dsd_diin(s, st, orig_pos + data_size);
547  if (res < 0)
548  return res;
549  break;
550 
551  case MKTAG('P','R','O','P'):
552  if (data_size < 4)
553  return AVERROR_INVALIDDATA;
554  if (avio_rl32(pb) != MKTAG('S','N','D',' ')) {
555  avpriv_request_sample(s, "unknown property type");
556  break;
557  }
558  res = parse_dsd_prop(s, st, orig_pos + data_size);
559  if (res < 0)
560  return res;
561  break;
562 
563  case MKTAG('C','O','M','T'):
564  if (data_size < 2)
565  return AVERROR_INVALIDDATA;
566  nb_comments = avio_rb16(pb);
567  for (i = 0; i < nb_comments; i++) {
568  int year, mon, day, hour, min, type, ref;
569  char tmp[24];
570  const char *tag;
571  int metadata_size;
572 
573  year = avio_rb16(pb);
574  mon = avio_r8(pb);
575  day = avio_r8(pb);
576  hour = avio_r8(pb);
577  min = avio_r8(pb);
578  snprintf(tmp, sizeof(tmp), "%04d-%02d-%02d %02d:%02d", year, mon, day, hour, min);
579  av_dict_set(&st->metadata, "comment_time", tmp, 0);
580 
581  type = avio_rb16(pb);
582  ref = avio_rb16(pb);
583  switch (type) {
584  case 1:
585  if (!i)
586  tag = "channel_comment";
587  else {
588  snprintf(tmp, sizeof(tmp), "channel%d_comment", ref);
589  tag = tmp;
590  }
591  break;
592  case 2:
593  tag = ref < FF_ARRAY_ELEMS(dsd_source_comment) ? dsd_source_comment[ref] : "source_comment";
594  break;
595  case 3:
596  tag = ref < FF_ARRAY_ELEMS(dsd_history_comment) ? dsd_history_comment[ref] : "file_history";
597  break;
598  default:
599  tag = "comment";
600  }
601 
602  metadata_size = avio_rb32(pb);
603  if ((res = get_metadata(s, tag, metadata_size)) < 0) {
604  av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", tag);
605  return res;
606  }
607 
608  if (metadata_size & 1)
609  avio_skip(pb, 1);
610  }
611  break;
612  }
613 
614  if (metadata_tag) {
615  if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
616  av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
617  return res;
618  }
619  }
620  avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
621  }
622 
623  avio_seek(pb, iff->body_pos, SEEK_SET);
624 
625  switch(st->codec->codec_type) {
626  case AVMEDIA_TYPE_AUDIO:
627  avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
628 
629  if (st->codec->codec_tag == ID_16SV)
630  st->codec->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;
631  else if (st->codec->codec_tag == ID_MAUD) {
632  if (iff->maud_bits == 8 && !iff->maud_compression) {
633  st->codec->codec_id = AV_CODEC_ID_PCM_U8;
634  } else if (iff->maud_bits == 16 && !iff->maud_compression) {
635  st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
636  } else if (iff->maud_bits == 8 && iff->maud_compression == 2) {
637  st->codec->codec_id = AV_CODEC_ID_PCM_ALAW;
638  } else if (iff->maud_bits == 8 && iff->maud_compression == 3) {
639  st->codec->codec_id = AV_CODEC_ID_PCM_MULAW;
640  } else {
641  avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);
642  return AVERROR_PATCHWELCOME;
643  }
644  } else if (st->codec->codec_tag != ID_DSD) {
645  switch (iff->svx8_compression) {
646  case COMP_NONE:
647  st->codec->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
648  break;
649  case COMP_FIB:
650  st->codec->codec_id = AV_CODEC_ID_8SVX_FIB;
651  break;
652  case COMP_EXP:
653  st->codec->codec_id = AV_CODEC_ID_8SVX_EXP;
654  break;
655  default:
656  av_log(s, AV_LOG_ERROR,
657  "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
658  return -1;
659  }
660  }
661 
662  st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
663  st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
664  st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
665  break;
666 
667  case AVMEDIA_TYPE_VIDEO:
668  iff->bpp = st->codec->bits_per_coded_sample;
669  if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
670  iff->ham = iff->bpp > 6 ? 6 : 4;
671  st->codec->bits_per_coded_sample = 24;
672  }
673  iff->flags = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
674  iff->masking = masking;
675  iff->transparency = transparency;
676 
677  if (!st->codec->extradata) {
678  st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
679  st->codec->extradata = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
680  if (!st->codec->extradata)
681  return AVERROR(ENOMEM);
682  }
683  av_assert0(st->codec->extradata_size >= IFF_EXTRA_VIDEO_SIZE);
684  buf = st->codec->extradata;
685  bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
686  bytestream_put_byte(&buf, iff->bitmap_compression);
687  bytestream_put_byte(&buf, iff->bpp);
688  bytestream_put_byte(&buf, iff->ham);
689  bytestream_put_byte(&buf, iff->flags);
690  bytestream_put_be16(&buf, iff->transparency);
691  bytestream_put_byte(&buf, iff->masking);
692  bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));
693  st->codec->codec_id = AV_CODEC_ID_IFF_ILBM;
694  break;
695  default:
696  return -1;
697  }
698 
699  return 0;
700 }
701 
702 static int iff_read_packet(AVFormatContext *s,
703  AVPacket *pkt)
704 {
705  IffDemuxContext *iff = s->priv_data;
706  AVIOContext *pb = s->pb;
707  AVStream *st = s->streams[0];
708  int ret;
709  int64_t pos = avio_tell(pb);
710 
711  if (pos >= iff->body_end)
712  return AVERROR_EOF;
713 
714  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
715  if (st->codec->codec_tag == ID_DSD || st->codec->codec_tag == ID_MAUD) {
716  ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * st->codec->block_align));
717  } else {
718  ret = av_get_packet(pb, pkt, iff->body_size);
719  }
720  } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
721  uint8_t *buf;
722 
723  if (av_new_packet(pkt, iff->body_size + 2) < 0) {
724  return AVERROR(ENOMEM);
725  }
726 
727  buf = pkt->data;
728  bytestream_put_be16(&buf, 2);
729  ret = avio_read(pb, buf, iff->body_size);
730  if (ret<0) {
731  av_free_packet(pkt);
732  } else if (ret < iff->body_size)
733  av_shrink_packet(pkt, ret + 2);
734  } else {
735  av_assert0(0);
736  }
737 
738  if (pos == iff->body_pos)
739  pkt->flags |= AV_PKT_FLAG_KEY;
740  if (ret < 0)
741  return ret;
742  pkt->stream_index = 0;
743  return ret;
744 }
745 
746 AVInputFormat ff_iff_demuxer = {
747  .name = "iff",
748  .long_name = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),
749  .priv_data_size = sizeof(IffDemuxContext),
750  .read_probe = iff_probe,
751  .read_header = iff_read_header,
752  .read_packet = iff_read_packet,
753  .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
754 };
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