FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
iff.c
Go to the documentation of this file.
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 
63 #define ID_FORM MKTAG('F','O','R','M')
64 #define ID_FRM8 MKTAG('F','R','M','8')
65 #define ID_ANNO MKTAG('A','N','N','O')
66 #define ID_AUTH MKTAG('A','U','T','H')
67 #define ID_CHRS MKTAG('C','H','R','S')
68 #define ID_COPYRIGHT MKTAG('(','c',')',' ')
69 #define ID_CSET MKTAG('C','S','E','T')
70 #define ID_FVER MKTAG('F','V','E','R')
71 #define ID_NAME MKTAG('N','A','M','E')
72 #define ID_TEXT MKTAG('T','E','X','T')
73 #define ID_ABIT MKTAG('A','B','I','T')
74 #define ID_BODY MKTAG('B','O','D','Y')
75 #define ID_DBOD MKTAG('D','B','O','D')
76 #define ID_DPEL MKTAG('D','P','E','L')
77 #define ID_DLOC MKTAG('D','L','O','C')
78 #define ID_TVDC MKTAG('T','V','D','C')
79 
80 #define LEFT 2
81 #define RIGHT 4
82 #define STEREO 6
83 
84 /**
85  * This number of bytes if added at the beginning of each AVPacket
86  * which contain additional information about video properties
87  * which has to be shared between demuxer and decoder.
88  * This number may change between frames, e.g. the demuxer might
89  * set it to smallest possible size of 2 to indicate that there's
90  * no extradata changing in this frame.
91  */
92 #define IFF_EXTRA_VIDEO_SIZE 41
93 
94 typedef enum {
95  COMP_NONE,
96  COMP_FIB,
97  COMP_EXP
98 } svx8_compression_type;
99 
100 typedef struct {
101  int is_64bit; ///< chunk size is 64-bit
102  int64_t body_pos;
103  int64_t body_end;
104  uint32_t body_size;
105  svx8_compression_type svx8_compression;
106  unsigned maud_bits;
107  unsigned maud_compression;
108  unsigned bitmap_compression; ///< delta compression method used
109  unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
110  unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
111  unsigned flags; ///< 1 for EHB, 0 is no extra half darkening
112  unsigned transparency; ///< transparency color index in palette
113  unsigned masking; ///< masking method used
114  uint8_t tvdc[32]; ///< TVDC lookup table
115 } IffDemuxContext;
116 
117 /* Metadata string read */
118 static int get_metadata(AVFormatContext *s,
119  const char *const tag,
120  const unsigned data_size)
121 {
122  uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
123 
124  if (!buf)
125  return AVERROR(ENOMEM);
126 
127  if (avio_read(s->pb, buf, data_size) != data_size) {
128  av_free(buf);
129  return AVERROR(EIO);
130  }
131  buf[data_size] = 0;
132  av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
133  return 0;
134 }
135 
136 static int iff_probe(AVProbeData *p)
137 {
138  const uint8_t *d = p->buf;
139 
140  if ( (AV_RL32(d) == ID_FORM &&
141  (AV_RL32(d+8) == ID_8SVX ||
142  AV_RL32(d+8) == ID_16SV ||
143  AV_RL32(d+8) == ID_MAUD ||
144  AV_RL32(d+8) == ID_PBM ||
145  AV_RL32(d+8) == ID_ACBM ||
146  AV_RL32(d+8) == ID_DEEP ||
147  AV_RL32(d+8) == ID_ILBM ||
148  AV_RL32(d+8) == ID_RGB8 ||
149  AV_RL32(d+8) == ID_RGB8 ||
150  AV_RL32(d+8) == ID_RGBN)) ||
151  (AV_RL32(d) == ID_FRM8 && AV_RL32(d+12) == ID_DSD))
152  return AVPROBE_SCORE_MAX;
153  return 0;
154 }
155 
156 static const AVCodecTag dsd_codec_tags[] = {
157  { AV_CODEC_ID_DSD_MSBF, ID_DSD },
158  { AV_CODEC_ID_NONE, 0 },
159 };
160 
161 
162 #define DSD_SLFT MKTAG('S','L','F','T')
163 #define DSD_SRGT MKTAG('S','R','G','T')
164 #define DSD_MLFT MKTAG('M','L','F','T')
165 #define DSD_MRGT MKTAG('M','R','G','T')
166 #define DSD_C MKTAG('C',' ',' ',' ')
167 #define DSD_LS MKTAG('L','S',' ',' ')
168 #define DSD_RS MKTAG('R','S',' ',' ')
169 #define DSD_LFE MKTAG('L','F','E',' ')
170 
171 static const uint32_t dsd_stereo[] = { DSD_SLFT, DSD_SRGT };
172 static const uint32_t dsd_5point0[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LS, DSD_RS };
173 static const uint32_t dsd_5point1[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LFE, DSD_LS, DSD_RS };
174 
175 typedef struct {
176  uint64_t layout;
177  const uint32_t * dsd_layout;
178 } DSDLayoutDesc;
179 
180 static const DSDLayoutDesc dsd_channel_layout[] = {
181  { AV_CH_LAYOUT_STEREO, dsd_stereo },
182  { AV_CH_LAYOUT_5POINT0, dsd_5point0 },
183  { AV_CH_LAYOUT_5POINT1, dsd_5point1 },
184 };
185 
186 static const uint64_t dsd_loudspeaker_config[] = {
187  AV_CH_LAYOUT_STEREO,
188  0, 0,
189  AV_CH_LAYOUT_5POINT0, AV_CH_LAYOUT_5POINT1,
190 };
191 
192 static const char * dsd_source_comment[] = {
193  "dsd_source_comment",
194  "analogue_source_comment",
195  "pcm_source_comment",
196 };
197 
198 static const char * dsd_history_comment[] = {
199  "general_remark",
200  "operator_name",
201  "creating_machine",
202  "timezone",
203  "file_revision"
204 };
205 
206 static int parse_dsd_diin(AVFormatContext *s, AVStream *st, uint64_t eof)
207 {
208  AVIOContext *pb = s->pb;
209 
210  while (avio_tell(pb) + 12 <= eof) {
211  uint32_t tag = avio_rl32(pb);
212  uint64_t size = avio_rb64(pb);
213  uint64_t orig_pos = avio_tell(pb);
214  const char * metadata_tag = NULL;
215 
216  switch(tag) {
217  case MKTAG('D','I','A','R'): metadata_tag = "artist"; break;
218  case MKTAG('D','I','T','I'): metadata_tag = "title"; break;
219  }
220 
221  if (metadata_tag && size > 4) {
222  unsigned int tag_size = avio_rb32(pb);
223  int ret = get_metadata(s, metadata_tag, FFMIN(tag_size, size - 4));
224  if (ret < 0) {
225  av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
226  return ret;
227  }
228  }
229 
230  avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
231  }
232 
233  return 0;
234 }
235 
236 static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)
237 {
238  AVIOContext *pb = s->pb;
239  char abss[24];
240  int hour, min, sec, i, ret, config;
241  int dsd_layout[6];
242  ID3v2ExtraMeta *id3v2_extra_meta;
243 
244  while (avio_tell(pb) + 12 <= eof) {
245  uint32_t tag = avio_rl32(pb);
246  uint64_t size = avio_rb64(pb);
247  uint64_t orig_pos = avio_tell(pb);
248 
249  switch(tag) {
250  case MKTAG('A','B','S','S'):
251  if (size < 8)
252  return AVERROR_INVALIDDATA;
253  hour = avio_rb16(pb);
254  min = avio_r8(pb);
255  sec = avio_r8(pb);
256  snprintf(abss, sizeof(abss), "%02dh:%02dm:%02ds:%d", hour, min, sec, avio_rb32(pb));
257  av_dict_set(&st->metadata, "absolute_start_time", abss, 0);
258  break;
259 
260  case MKTAG('C','H','N','L'):
261  if (size < 2)
262  return AVERROR_INVALIDDATA;
263  st->codec->channels = avio_rb16(pb);
264  if (size < 2 + st->codec->channels * 4)
265  return AVERROR_INVALIDDATA;
266  st->codec->channel_layout = 0;
267  if (st->codec->channels > FF_ARRAY_ELEMS(dsd_layout)) {
268  avpriv_request_sample(s, "channel layout");
269  break;
270  }
271  for (i = 0; i < st->codec->channels; i++)
272  dsd_layout[i] = avio_rl32(pb);
273  for (i = 0; i < FF_ARRAY_ELEMS(dsd_channel_layout); i++) {
274  const DSDLayoutDesc * d = &dsd_channel_layout[i];
275  if (av_get_channel_layout_nb_channels(d->layout) == st->codec->channels &&
276  !memcmp(d->dsd_layout, dsd_layout, st->codec->channels * sizeof(uint32_t))) {
277  st->codec->channel_layout = d->layout;
278  break;
279  }
280  }
281  break;
282 
283  case MKTAG('C','M','P','R'):
284  if (size < 4)
285  return AVERROR_INVALIDDATA;
286  st->codec->codec_id = ff_codec_get_id(dsd_codec_tags, avio_rl32(pb));
287  break;
288 
289  case MKTAG('F','S',' ',' '):
290  if (size < 4)
291  return AVERROR_INVALIDDATA;
292  st->codec->sample_rate = avio_rb32(pb) / 8;
293  break;
294 
295  case MKTAG('I','D','3',' '):
296  id3v2_extra_meta = NULL;
297  ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
298  if (id3v2_extra_meta) {
299  if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
300  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
301  return ret;
302  }
303  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
304  }
305 
306  if (size < avio_tell(pb) - orig_pos) {
307  av_log(s, AV_LOG_ERROR, "id3 exceeds chunk size\n");
308  return AVERROR_INVALIDDATA;
309  }
310  break;
311 
312  case MKTAG('L','S','C','O'):
313  if (size < 2)
314  return AVERROR_INVALIDDATA;
315  config = avio_rb16(pb);
316  if (config != 0xFFFF) {
317  if (config < FF_ARRAY_ELEMS(dsd_loudspeaker_config))
318  st->codec->channel_layout = dsd_loudspeaker_config[config];
319  if (!st->codec->channel_layout)
320  avpriv_request_sample(s, "loudspeaker configuration %d", config);
321  }
322  break;
323  }
324 
325  avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
326  }
327 
328  return 0;
329 }
330 
331 static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
332 static const uint8_t deep_rgba[] = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
333 static const uint8_t deep_bgra[] = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};
334 static const uint8_t deep_argb[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};
335 static const uint8_t deep_abgr[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};
336 
337 static int iff_read_header(AVFormatContext *s)
338 {
339  IffDemuxContext *iff = s->priv_data;
340  AVIOContext *pb = s->pb;
341  AVStream *st;
342  uint8_t *buf;
343  uint32_t chunk_id;
344  uint64_t data_size;
345  uint32_t screenmode = 0, num, den;
346  unsigned transparency = 0;
347  unsigned masking = 0; // no mask
348  uint8_t fmt[16];
349  int fmt_size;
350 
351  st = avformat_new_stream(s, NULL);
352  if (!st)
353  return AVERROR(ENOMEM);
354 
355  st->codec->channels = 1;
356  st->codec->channel_layout = AV_CH_LAYOUT_MONO;
357  iff->is_64bit = avio_rl32(pb) == ID_FRM8;
358  avio_skip(pb, iff->is_64bit ? 8 : 4);
359  // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
360  st->codec->codec_tag = avio_rl32(pb);
361  iff->bitmap_compression = -1;
362  iff->svx8_compression = -1;
363  iff->maud_bits = -1;
364  iff->maud_compression = -1;
365 
366  while(!url_feof(pb)) {
367  uint64_t orig_pos;
368  int res;
369  const char *metadata_tag = NULL;
370  int version, nb_comments, i;
371  chunk_id = avio_rl32(pb);
372  data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);
373  orig_pos = avio_tell(pb);
374 
375  switch(chunk_id) {
376  case ID_VHDR:
377  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
378 
379  if (data_size < 14)
380  return AVERROR_INVALIDDATA;
381  avio_skip(pb, 12);
382  st->codec->sample_rate = avio_rb16(pb);
383  if (data_size >= 16) {
384  avio_skip(pb, 1);
385  iff->svx8_compression = avio_r8(pb);
386  }
387  break;
388 
389  case ID_MHDR:
390  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
391 
392  if (data_size < 32)
393  return AVERROR_INVALIDDATA;
394  avio_skip(pb, 4);
395  iff->maud_bits = avio_rb16(pb);
396  avio_skip(pb, 2);
397  num = avio_rb32(pb);
398  den = avio_rb16(pb);
399  if (!den)
400  return AVERROR_INVALIDDATA;
401  avio_skip(pb, 2);
402  st->codec->sample_rate = num / den;
403  st->codec->channels = avio_rb16(pb);
404  iff->maud_compression = avio_rb16(pb);
405  if (st->codec->channels == 1)
406  st->codec->channel_layout = AV_CH_LAYOUT_MONO;
407  else if (st->codec->channels == 2)
408  st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
409  break;
410 
411  case ID_ABIT:
412  case ID_BODY:
413  case ID_DBOD:
414  case ID_DSD:
415  case ID_MDAT:
416  iff->body_pos = avio_tell(pb);
417  iff->body_end = iff->body_pos + data_size;
418  iff->body_size = data_size;
419  break;
420 
421  case ID_CHAN:
422  if (data_size < 4)
423  return AVERROR_INVALIDDATA;
424  if (avio_rb32(pb) < 6) {
425  st->codec->channels = 1;
426  st->codec->channel_layout = AV_CH_LAYOUT_MONO;
427  } else {
428  st->codec->channels = 2;
429  st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
430  }
431  break;
432 
433  case ID_CAMG:
434  if (data_size < 4)
435  return AVERROR_INVALIDDATA;
436  screenmode = avio_rb32(pb);
437  break;
438 
439  case ID_CMAP:
440  if (data_size < 3 || data_size > 768 || data_size % 3) {
441  av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %"PRIu64"\n",
442  data_size);
443  return AVERROR_INVALIDDATA;
444  }
445  st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
446  st->codec->extradata = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
447  if (!st->codec->extradata)
448  return AVERROR(ENOMEM);
449  if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)
450  return AVERROR(EIO);
451  break;
452 
453  case ID_BMHD:
454  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
455  if (data_size <= 8)
456  return AVERROR_INVALIDDATA;
457  st->codec->width = avio_rb16(pb);
458  st->codec->height = avio_rb16(pb);
459  avio_skip(pb, 4); // x, y offset
460  st->codec->bits_per_coded_sample = avio_r8(pb);
461  if (data_size >= 10)
462  masking = avio_r8(pb);
463  if (data_size >= 11)
464  iff->bitmap_compression = avio_r8(pb);
465  if (data_size >= 14) {
466  avio_skip(pb, 1); // padding
467  transparency = avio_rb16(pb);
468  }
469  if (data_size >= 16) {
470  st->sample_aspect_ratio.num = avio_r8(pb);
471  st->sample_aspect_ratio.den = avio_r8(pb);
472  }
473  break;
474 
475  case ID_DPEL:
476  if (data_size < 4 || (data_size & 3))
477  return AVERROR_INVALIDDATA;
478  if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)
479  return fmt_size;
480  if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))
481  st->codec->pix_fmt = AV_PIX_FMT_RGB24;
482  else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))
483  st->codec->pix_fmt = AV_PIX_FMT_RGBA;
484  else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))
485  st->codec->pix_fmt = AV_PIX_FMT_BGRA;
486  else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))
487  st->codec->pix_fmt = AV_PIX_FMT_ARGB;
488  else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))
489  st->codec->pix_fmt = AV_PIX_FMT_ABGR;
490  else {
491  avpriv_request_sample(s, "color format %.16s", fmt);
492  return AVERROR_PATCHWELCOME;
493  }
494  break;
495 
496  case ID_DGBL:
497  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
498  if (data_size < 8)
499  return AVERROR_INVALIDDATA;
500  st->codec->width = avio_rb16(pb);
501  st->codec->height = avio_rb16(pb);
502  iff->bitmap_compression = avio_rb16(pb);
503  st->sample_aspect_ratio.num = avio_r8(pb);
504  st->sample_aspect_ratio.den = avio_r8(pb);
505  st->codec->bits_per_coded_sample = 24;
506  break;
507 
508  case ID_DLOC:
509  if (data_size < 4)
510  return AVERROR_INVALIDDATA;
511  st->codec->width = avio_rb16(pb);
512  st->codec->height = avio_rb16(pb);
513  break;
514 
515  case ID_TVDC:
516  if (data_size < sizeof(iff->tvdc))
517  return AVERROR_INVALIDDATA;
518  res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));
519  if (res < 0)
520  return res;
521  break;
522 
523  case ID_ANNO:
524  case ID_TEXT: metadata_tag = "comment"; break;
525  case ID_AUTH: metadata_tag = "artist"; break;
526  case ID_COPYRIGHT: metadata_tag = "copyright"; break;
527  case ID_NAME: metadata_tag = "title"; break;
528 
529  /* DSD tags */
530 
531  case MKTAG('F','V','E','R'):
532  if (data_size < 4)
533  return AVERROR_INVALIDDATA;
534  version = avio_rb32(pb);
535  av_log(s, AV_LOG_DEBUG, "DSIFF v%d.%d.%d.%d\n",version >> 24, (version >> 16) & 0xFF, (version >> 8) & 0xFF, version & 0xFF);
536  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
537  break;
538 
539  case MKTAG('D','I','I','N'):
540  res = parse_dsd_diin(s, st, orig_pos + data_size);
541  if (res < 0)
542  return res;
543  break;
544 
545  case MKTAG('P','R','O','P'):
546  if (data_size < 4)
547  return AVERROR_INVALIDDATA;
548  if (avio_rl32(pb) != MKTAG('S','N','D',' ')) {
549  avpriv_request_sample(s, "unknown property type");
550  break;
551  }
552  res = parse_dsd_prop(s, st, orig_pos + data_size);
553  if (res < 0)
554  return res;
555  break;
556 
557  case MKTAG('C','O','M','T'):
558  if (data_size < 2)
559  return AVERROR_INVALIDDATA;
560  nb_comments = avio_rb16(pb);
561  for (i = 0; i < nb_comments; i++) {
562  int year, mon, day, hour, min, type, ref;
563  char tmp[24];
564  const char *tag;
565  int metadata_size;
566 
567  year = avio_rb16(pb);
568  mon = avio_r8(pb);
569  day = avio_r8(pb);
570  hour = avio_r8(pb);
571  min = avio_r8(pb);
572  snprintf(tmp, sizeof(tmp), "%04d-%02d-%02d %02d:%02d", year, mon, day, hour, min);
573  av_dict_set(&st->metadata, "comment_time", tmp, 0);
574 
575  type = avio_rb16(pb);
576  ref = avio_rb16(pb);
577  switch (type) {
578  case 1:
579  if (!i)
580  tag = "channel_comment";
581  else {
582  snprintf(tmp, sizeof(tmp), "channel%d_comment", ref);
583  tag = tmp;
584  }
585  break;
586  case 2:
587  tag = ref < FF_ARRAY_ELEMS(dsd_source_comment) ? dsd_history_comment[ref] : "source_comment";
588  break;
589  case 3:
590  tag = ref < FF_ARRAY_ELEMS(dsd_history_comment) ? dsd_history_comment[ref] : "file_history";
591  break;
592  default:
593  tag = "comment";
594  }
595 
596  metadata_size = avio_rb32(pb);
597  if ((res = get_metadata(s, tag, metadata_size)) < 0) {
598  av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", tag);
599  return res;
600  }
601 
602  if (metadata_size & 1)
603  avio_skip(pb, 1);
604  }
605  break;
606  }
607 
608  if (metadata_tag) {
609  if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
610  av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
611  return res;
612  }
613  }
614  avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
615  }
616 
617  avio_seek(pb, iff->body_pos, SEEK_SET);
618 
619  switch(st->codec->codec_type) {
620  case AVMEDIA_TYPE_AUDIO:
621  avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
622 
623  if (st->codec->codec_tag == ID_16SV)
624  st->codec->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;
625  else if (st->codec->codec_tag == ID_MAUD) {
626  if (iff->maud_bits == 8 && !iff->maud_compression) {
627  st->codec->codec_id = AV_CODEC_ID_PCM_U8;
628  } else if (iff->maud_bits == 16 && !iff->maud_compression) {
629  st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
630  } else if (iff->maud_bits == 8 && iff->maud_compression == 2) {
631  st->codec->codec_id = AV_CODEC_ID_PCM_ALAW;
632  } else if (iff->maud_bits == 8 && iff->maud_compression == 3) {
633  st->codec->codec_id = AV_CODEC_ID_PCM_MULAW;
634  } else {
635  avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);
636  return AVERROR_PATCHWELCOME;
637  }
638  } else if (st->codec->codec_tag != ID_DSD) {
639  switch (iff->svx8_compression) {
640  case COMP_NONE:
641  st->codec->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
642  break;
643  case COMP_FIB:
644  st->codec->codec_id = AV_CODEC_ID_8SVX_FIB;
645  break;
646  case COMP_EXP:
647  st->codec->codec_id = AV_CODEC_ID_8SVX_EXP;
648  break;
649  default:
650  av_log(s, AV_LOG_ERROR,
651  "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
652  return -1;
653  }
654  }
655 
656  st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
657  st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
658  st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
659  break;
660 
661  case AVMEDIA_TYPE_VIDEO:
662  iff->bpp = st->codec->bits_per_coded_sample;
663  if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
664  iff->ham = iff->bpp > 6 ? 6 : 4;
665  st->codec->bits_per_coded_sample = 24;
666  }
667  iff->flags = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
668  iff->masking = masking;
669  iff->transparency = transparency;
670 
671  if (!st->codec->extradata) {
672  st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
673  st->codec->extradata = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
674  if (!st->codec->extradata)
675  return AVERROR(ENOMEM);
676  }
677  av_assert0(st->codec->extradata_size >= IFF_EXTRA_VIDEO_SIZE);
678  buf = st->codec->extradata;
679  bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
680  bytestream_put_byte(&buf, iff->bitmap_compression);
681  bytestream_put_byte(&buf, iff->bpp);
682  bytestream_put_byte(&buf, iff->ham);
683  bytestream_put_byte(&buf, iff->flags);
684  bytestream_put_be16(&buf, iff->transparency);
685  bytestream_put_byte(&buf, iff->masking);
686  bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));
687  st->codec->codec_id = AV_CODEC_ID_IFF_ILBM;
688  break;
689  default:
690  return -1;
691  }
692 
693  return 0;
694 }
695 
696 static int iff_read_packet(AVFormatContext *s,
697  AVPacket *pkt)
698 {
699  IffDemuxContext *iff = s->priv_data;
700  AVIOContext *pb = s->pb;
701  AVStream *st = s->streams[0];
702  int ret;
703  int64_t pos = avio_tell(pb);
704 
705  if (pos >= iff->body_end)
706  return AVERROR_EOF;
707 
708  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
709  if (st->codec->codec_tag == ID_DSD || st->codec->codec_tag == ID_MAUD) {
710  ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * st->codec->block_align));
711  } else {
712  ret = av_get_packet(pb, pkt, iff->body_size);
713  }
714  } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
715  uint8_t *buf;
716 
717  if (av_new_packet(pkt, iff->body_size + 2) < 0) {
718  return AVERROR(ENOMEM);
719  }
720 
721  buf = pkt->data;
722  bytestream_put_be16(&buf, 2);
723  ret = avio_read(pb, buf, iff->body_size);
724  if (ret<0) {
725  av_free_packet(pkt);
726  } else if (ret < iff->body_size)
727  av_shrink_packet(pkt, ret + 2);
728  } else {
729  av_assert0(0);
730  }
731 
732  if (pos == iff->body_pos)
733  pkt->flags |= AV_PKT_FLAG_KEY;
734  if (ret < 0)
735  return ret;
736  pkt->stream_index = 0;
737  return ret;
738 }
739 
740 AVInputFormat ff_iff_demuxer = {
741  .name = "iff",
742  .long_name = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),
743  .priv_data_size = sizeof(IffDemuxContext),
744  .read_probe = iff_probe,
745  .read_header = iff_read_header,
746  .read_packet = iff_read_packet,
747  .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
748 };
Generated on Sun Jul 20 2014 23:05:49 for FFmpeg by   doxygen 1.8.2