libavformat/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 "libavutil/avassert.h"
32 #include "libavutil/channel_layout.h"
33 #include "libavutil/intreadwrite.h"
34 #include "libavutil/dict.h"
35 #include "libavcodec/bytestream.h"
36 #include "avformat.h"
37 #include "internal.h"
38 
39 #define ID_8SVX MKTAG('8','S','V','X')
40 #define ID_16SV MKTAG('1','6','S','V')
41 #define ID_MAUD MKTAG('M','A','U','D')
42 #define ID_MHDR MKTAG('M','H','D','R')
43 #define ID_MDAT MKTAG('M','D','A','T')
44 #define ID_VHDR MKTAG('V','H','D','R')
45 #define ID_ATAK MKTAG('A','T','A','K')
46 #define ID_RLSE MKTAG('R','L','S','E')
47 #define ID_CHAN MKTAG('C','H','A','N')
48 #define ID_PBM MKTAG('P','B','M',' ')
49 #define ID_ILBM MKTAG('I','L','B','M')
50 #define ID_BMHD MKTAG('B','M','H','D')
51 #define ID_DGBL MKTAG('D','G','B','L')
52 #define ID_CAMG MKTAG('C','A','M','G')
53 #define ID_CMAP MKTAG('C','M','A','P')
54 #define ID_ACBM MKTAG('A','C','B','M')
55 #define ID_DEEP MKTAG('D','E','E','P')
56 #define ID_RGB8 MKTAG('R','G','B','8')
57 #define ID_RGBN MKTAG('R','G','B','N')
58 
59 #define ID_FORM MKTAG('F','O','R','M')
60 #define ID_ANNO MKTAG('A','N','N','O')
61 #define ID_AUTH MKTAG('A','U','T','H')
62 #define ID_CHRS MKTAG('C','H','R','S')
63 #define ID_COPYRIGHT MKTAG('(','c',')',' ')
64 #define ID_CSET MKTAG('C','S','E','T')
65 #define ID_FVER MKTAG('F','V','E','R')
66 #define ID_NAME MKTAG('N','A','M','E')
67 #define ID_TEXT MKTAG('T','E','X','T')
68 #define ID_ABIT MKTAG('A','B','I','T')
69 #define ID_BODY MKTAG('B','O','D','Y')
70 #define ID_DBOD MKTAG('D','B','O','D')
71 #define ID_DPEL MKTAG('D','P','E','L')
72 #define ID_DLOC MKTAG('D','L','O','C')
73 #define ID_TVDC MKTAG('T','V','D','C')
74 
75 #define LEFT 2
76 #define RIGHT 4
77 #define STEREO 6
78 
79 /**
80  * This number of bytes if added at the beginning of each AVPacket
81  * which contain additional information about video properties
82  * which has to be shared between demuxer and decoder.
83  * This number may change between frames, e.g. the demuxer might
84  * set it to smallest possible size of 2 to indicate that there's
85  * no extradata changing in this frame.
86  */
87 #define IFF_EXTRA_VIDEO_SIZE 41
88 
89 typedef enum {
90  COMP_NONE,
91  COMP_FIB,
92  COMP_EXP
93 } svx8_compression_type;
94 
95 typedef struct {
96  int64_t body_pos;
97  int64_t body_end;
98  uint32_t body_size;
99  svx8_compression_type svx8_compression;
100  unsigned maud_bits;
101  unsigned maud_compression;
102  unsigned bitmap_compression; ///< delta compression method used
103  unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
104  unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
105  unsigned flags; ///< 1 for EHB, 0 is no extra half darkening
106  unsigned transparency; ///< transparency color index in palette
107  unsigned masking; ///< masking method used
108  uint8_t tvdc[32]; ///< TVDC lookup table
109 } IffDemuxContext;
110 
111 /* Metadata string read */
112 static int get_metadata(AVFormatContext *s,
113  const char *const tag,
114  const unsigned data_size)
115 {
116  uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
117 
118  if (!buf)
119  return AVERROR(ENOMEM);
120 
121  if (avio_read(s->pb, buf, data_size) < 0) {
122  av_free(buf);
123  return AVERROR(EIO);
124  }
125  buf[data_size] = 0;
126  av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
127  return 0;
128 }
129 
130 static int iff_probe(AVProbeData *p)
131 {
132  const uint8_t *d = p->buf;
133 
134  if ( AV_RL32(d) == ID_FORM &&
135  (AV_RL32(d+8) == ID_8SVX ||
136  AV_RL32(d+8) == ID_16SV ||
137  AV_RL32(d+8) == ID_MAUD ||
138  AV_RL32(d+8) == ID_PBM ||
139  AV_RL32(d+8) == ID_ACBM ||
140  AV_RL32(d+8) == ID_DEEP ||
141  AV_RL32(d+8) == ID_ILBM ||
142  AV_RL32(d+8) == ID_RGB8 ||
143  AV_RL32(d+8) == ID_RGBN) )
144  return AVPROBE_SCORE_MAX;
145  return 0;
146 }
147 
148 static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
149 static const uint8_t deep_rgba[] = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
150 static const uint8_t deep_bgra[] = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};
151 static const uint8_t deep_argb[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};
152 static const uint8_t deep_abgr[] = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};
153 
154 static int iff_read_header(AVFormatContext *s)
155 {
156  IffDemuxContext *iff = s->priv_data;
157  AVIOContext *pb = s->pb;
158  AVStream *st;
159  uint8_t *buf;
160  uint32_t chunk_id, data_size;
161  uint32_t screenmode = 0, num, den;
162  unsigned transparency = 0;
163  unsigned masking = 0; // no mask
164  uint8_t fmt[16];
165  int fmt_size;
166 
167  st = avformat_new_stream(s, NULL);
168  if (!st)
169  return AVERROR(ENOMEM);
170 
171  st->codec->channels = 1;
172  st->codec->channel_layout = AV_CH_LAYOUT_MONO;
173  avio_skip(pb, 8);
174  // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
175  st->codec->codec_tag = avio_rl32(pb);
176  iff->bitmap_compression = -1;
177  iff->svx8_compression = -1;
178  iff->maud_bits = -1;
179  iff->maud_compression = -1;
180 
181  while(!url_feof(pb)) {
182  uint64_t orig_pos;
183  int res;
184  const char *metadata_tag = NULL;
185  chunk_id = avio_rl32(pb);
186  data_size = avio_rb32(pb);
187  orig_pos = avio_tell(pb);
188 
189  switch(chunk_id) {
190  case ID_VHDR:
191  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
192 
193  if (data_size < 14)
194  return AVERROR_INVALIDDATA;
195  avio_skip(pb, 12);
196  st->codec->sample_rate = avio_rb16(pb);
197  if (data_size >= 16) {
198  avio_skip(pb, 1);
199  iff->svx8_compression = avio_r8(pb);
200  }
201  break;
202 
203  case ID_MHDR:
204  st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
205 
206  if (data_size < 32)
207  return AVERROR_INVALIDDATA;
208  avio_skip(pb, 4);
209  iff->maud_bits = avio_rb16(pb);
210  avio_skip(pb, 2);
211  num = avio_rb32(pb);
212  den = avio_rb16(pb);
213  if (!den)
214  return AVERROR_INVALIDDATA;
215  avio_skip(pb, 2);
216  st->codec->sample_rate = num / den;
217  st->codec->channels = avio_rb16(pb);
218  iff->maud_compression = avio_rb16(pb);
219  if (st->codec->channels == 1)
220  st->codec->channel_layout = AV_CH_LAYOUT_MONO;
221  else if (st->codec->channels == 2)
222  st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
223  break;
224 
225  case ID_ABIT:
226  case ID_BODY:
227  case ID_DBOD:
228  case ID_MDAT:
229  iff->body_pos = avio_tell(pb);
230  iff->body_end = iff->body_pos + data_size;
231  iff->body_size = data_size;
232  break;
233 
234  case ID_CHAN:
235  if (data_size < 4)
236  return AVERROR_INVALIDDATA;
237  if (avio_rb32(pb) < 6) {
238  st->codec->channels = 1;
239  st->codec->channel_layout = AV_CH_LAYOUT_MONO;
240  } else {
241  st->codec->channels = 2;
242  st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
243  }
244  break;
245 
246  case ID_CAMG:
247  if (data_size < 4)
248  return AVERROR_INVALIDDATA;
249  screenmode = avio_rb32(pb);
250  break;
251 
252  case ID_CMAP:
253  if (data_size < 3 || data_size > 768 || data_size % 3) {
254  av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %d\n",
255  data_size);
256  return AVERROR_INVALIDDATA;
257  }
258  st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
259  st->codec->extradata = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
260  if (!st->codec->extradata)
261  return AVERROR(ENOMEM);
262  if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)
263  return AVERROR(EIO);
264  break;
265 
266  case ID_BMHD:
267  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
268  if (data_size <= 8)
269  return AVERROR_INVALIDDATA;
270  st->codec->width = avio_rb16(pb);
271  st->codec->height = avio_rb16(pb);
272  avio_skip(pb, 4); // x, y offset
273  st->codec->bits_per_coded_sample = avio_r8(pb);
274  if (data_size >= 10)
275  masking = avio_r8(pb);
276  if (data_size >= 11)
277  iff->bitmap_compression = avio_r8(pb);
278  if (data_size >= 14) {
279  avio_skip(pb, 1); // padding
280  transparency = avio_rb16(pb);
281  }
282  if (data_size >= 16) {
283  st->sample_aspect_ratio.num = avio_r8(pb);
284  st->sample_aspect_ratio.den = avio_r8(pb);
285  }
286  break;
287 
288  case ID_DPEL:
289  if (data_size < 4 || (data_size & 3))
290  return AVERROR_INVALIDDATA;
291  if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)
292  return fmt_size;
293  if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))
294  st->codec->pix_fmt = AV_PIX_FMT_RGB24;
295  else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))
296  st->codec->pix_fmt = AV_PIX_FMT_RGBA;
297  else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))
298  st->codec->pix_fmt = AV_PIX_FMT_BGRA;
299  else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))
300  st->codec->pix_fmt = AV_PIX_FMT_ARGB;
301  else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))
302  st->codec->pix_fmt = AV_PIX_FMT_ABGR;
303  else {
304  avpriv_request_sample(s, "color format %.16s", fmt);
305  return AVERROR_PATCHWELCOME;
306  }
307  break;
308 
309  case ID_DGBL:
310  st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
311  if (data_size < 8)
312  return AVERROR_INVALIDDATA;
313  st->codec->width = avio_rb16(pb);
314  st->codec->height = avio_rb16(pb);
315  iff->bitmap_compression = avio_rb16(pb);
316  st->sample_aspect_ratio.num = avio_r8(pb);
317  st->sample_aspect_ratio.den = avio_r8(pb);
318  st->codec->bits_per_coded_sample = 24;
319  break;
320 
321  case ID_DLOC:
322  if (data_size < 4)
323  return AVERROR_INVALIDDATA;
324  st->codec->width = avio_rb16(pb);
325  st->codec->height = avio_rb16(pb);
326  break;
327 
328  case ID_TVDC:
329  if (data_size < sizeof(iff->tvdc))
330  return AVERROR_INVALIDDATA;
331  res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));
332  if (res < 0)
333  return res;
334  break;
335 
336  case ID_ANNO:
337  case ID_TEXT: metadata_tag = "comment"; break;
338  case ID_AUTH: metadata_tag = "artist"; break;
339  case ID_COPYRIGHT: metadata_tag = "copyright"; break;
340  case ID_NAME: metadata_tag = "title"; break;
341  }
342 
343  if (metadata_tag) {
344  if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
345  av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
346  return res;
347  }
348  }
349  avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
350  }
351 
352  avio_seek(pb, iff->body_pos, SEEK_SET);
353 
354  switch(st->codec->codec_type) {
355  case AVMEDIA_TYPE_AUDIO:
356  avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
357 
358  if (st->codec->codec_tag == ID_16SV)
359  st->codec->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;
360  else if (st->codec->codec_tag == ID_MAUD) {
361  if (iff->maud_bits == 8 && !iff->maud_compression) {
362  st->codec->codec_id = AV_CODEC_ID_PCM_U8;
363  } else if (iff->maud_bits == 16 && !iff->maud_compression) {
364  st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
365  } else if (iff->maud_bits == 8 && iff->maud_compression == 2) {
366  st->codec->codec_id = AV_CODEC_ID_PCM_ALAW;
367  } else if (iff->maud_bits == 8 && iff->maud_compression == 3) {
368  st->codec->codec_id = AV_CODEC_ID_PCM_MULAW;
369  } else {
370  avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);
371  return AVERROR_PATCHWELCOME;
372  }
373 
374  st->codec->bits_per_coded_sample =
375  av_get_bits_per_sample(st->codec->codec_id);
376 
377  st->codec->block_align =
378  st->codec->bits_per_coded_sample * st->codec->channels / 8;
379  } else {
380  switch (iff->svx8_compression) {
381  case COMP_NONE:
382  st->codec->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
383  break;
384  case COMP_FIB:
385  st->codec->codec_id = AV_CODEC_ID_8SVX_FIB;
386  break;
387  case COMP_EXP:
388  st->codec->codec_id = AV_CODEC_ID_8SVX_EXP;
389  break;
390  default:
391  av_log(s, AV_LOG_ERROR,
392  "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
393  return -1;
394  }
395  }
396 
397  st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
398  st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
399  st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
400  break;
401 
402  case AVMEDIA_TYPE_VIDEO:
403  iff->bpp = st->codec->bits_per_coded_sample;
404  if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
405  iff->ham = iff->bpp > 6 ? 6 : 4;
406  st->codec->bits_per_coded_sample = 24;
407  }
408  iff->flags = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
409  iff->masking = masking;
410  iff->transparency = transparency;
411 
412  if (!st->codec->extradata) {
413  st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
414  st->codec->extradata = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
415  if (!st->codec->extradata)
416  return AVERROR(ENOMEM);
417  }
418  av_assert0(st->codec->extradata_size >= IFF_EXTRA_VIDEO_SIZE);
419  buf = st->codec->extradata;
420  bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
421  bytestream_put_byte(&buf, iff->bitmap_compression);
422  bytestream_put_byte(&buf, iff->bpp);
423  bytestream_put_byte(&buf, iff->ham);
424  bytestream_put_byte(&buf, iff->flags);
425  bytestream_put_be16(&buf, iff->transparency);
426  bytestream_put_byte(&buf, iff->masking);
427  bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));
428  st->codec->codec_id = AV_CODEC_ID_IFF_ILBM;
429  break;
430  default:
431  return -1;
432  }
433 
434  return 0;
435 }
436 
437 static int iff_read_packet(AVFormatContext *s,
438  AVPacket *pkt)
439 {
440  IffDemuxContext *iff = s->priv_data;
441  AVIOContext *pb = s->pb;
442  AVStream *st = s->streams[0];
443  int ret;
444  int64_t pos = avio_tell(pb);
445 
446  if (pos >= iff->body_end)
447  return AVERROR_EOF;
448 
449  if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
450  if (st->codec->codec_tag == ID_MAUD) {
451  ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * st->codec->block_align));
452  } else {
453  ret = av_get_packet(pb, pkt, iff->body_size);
454  }
455  } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
456  uint8_t *buf;
457 
458  if (av_new_packet(pkt, iff->body_size + 2) < 0) {
459  return AVERROR(ENOMEM);
460  }
461 
462  buf = pkt->data;
463  bytestream_put_be16(&buf, 2);
464  ret = avio_read(pb, buf, iff->body_size);
465  } else {
466  av_assert0(0);
467  }
468 
469  if (pos == iff->body_pos)
470  pkt->flags |= AV_PKT_FLAG_KEY;
471  if (ret < 0)
472  return ret;
473  pkt->stream_index = 0;
474  return ret;
475 }
476 
477 AVInputFormat ff_iff_demuxer = {
478  .name = "iff",
479  .long_name = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),
480  .priv_data_size = sizeof(IffDemuxContext),
481  .read_probe = iff_probe,
482  .read_header = iff_read_header,
483  .read_packet = iff_read_packet,
484  .flags = AVFMT_GENERIC_INDEX,
485 };
deep_abgr
static const uint8_t deep_abgr[]
Definition: libavformat/iff.c:152
av_malloc
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:73
AV_CODEC_ID_8SVX_FIB
Definition: libavcodec/avcodec.h:437
IffDemuxContext::transparency
unsigned transparency
transparency color index in palette
Definition: libavformat/iff.c:106
ID_CAMG
#define ID_CAMG
Definition: libavformat/iff.c:52
s
const char * s
Definition: avisynth_c.h:668
AVIOContext
Bytestream IO Context.
Definition: avio.h:68
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
IffDemuxContext::ham
unsigned ham
0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
Definition: libavformat/iff.c:104
ID_RGB8
#define ID_RGB8
Definition: libavformat/iff.c:56
ID_ACBM
#define ID_ACBM
Definition: libavformat/iff.c:54
fmt
const char * fmt
Definition: avisynth_c.h:669
ID_PBM
#define ID_PBM
Definition: libavformat/iff.c:48
AV_PIX_FMT_RGB24
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:70
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: libavformat/utils.c:3952
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:709
AVRational::num
int num
numerator
Definition: rational.h:44
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:199
IffDemuxContext::maud_compression
unsigned maud_compression
Definition: libavformat/iff.c:101
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: libavcodec/avcodec.h:1330
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:256
ID_8SVX
#define ID_8SVX
Definition: libavformat/iff.c:39
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:86
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:595
IffDemuxContext::svx8_compression
svx8_compression_type svx8_compression
Definition: libavformat/iff.c:99
IFF_EXTRA_VIDEO_SIZE
#define IFF_EXTRA_VIDEO_SIZE
This number of bytes if added at the beginning of each AVPacket which contain additional information ...
Definition: libavformat/iff.c:87
AVCodecContext::block_align
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: libavcodec/avcodec.h:1898
ID_16SV
#define ID_16SV
Definition: libavformat/iff.c:40
d
set threshold d
Definition: extra/f0detectionyin.m:6
if
initialize output if(nPeaks >3)%at least 3 peaks in spectrum for trying to find f0 nf0peaks
AVFormatContext
Format I/O context.
Definition: avformat.h:944
ID_MHDR
#define ID_MHDR
Definition: libavformat/iff.c:42
IffDemuxContext::tvdc
uint8_t tvdc[32]
TVDC lookup table.
Definition: libavformat/iff.c:108
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
dict.h
Public dictionary API.
ID_ANNO
#define ID_ANNO
Definition: libavformat/iff.c:60
ID_MAUD
#define ID_MAUD
Definition: libavformat/iff.c:41
ID_NAME
#define ID_NAME
Definition: libavformat/iff.c:66
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:610
AV_CODEC_ID_PCM_S8_PLANAR
Definition: libavcodec/avcodec.h:326
iff_probe
static int iff_probe(AVProbeData *p)
Definition: libavformat/iff.c:130
pkt
static AVPacket pkt
Definition: demuxing.c:56
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: libavcodec/avcodec.h:1242
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: libavformat/utils.c:3362
AVFormatContext::streams
AVStream ** streams
Definition: avformat.h:992
AV_PIX_FMT_ABGR
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:98
ID_DBOD
#define ID_DBOD
Definition: libavformat/iff.c:70
AVPacket::data
uint8_t * data
Definition: libavcodec/avcodec.h:1051
tag
uint32_t tag
Definition: movenc.c:894
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
av_get_packet
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: libavformat/utils.c:328
bytestream_put_byte
static av_always_inline void bytestream_put_byte(uint8_t **b, const unsigned int value)
Definition: bytestream.h:92
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:248
AVCodecContext::bits_per_coded_sample
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: libavcodec/avcodec.h:2546
ID_CHAN
#define ID_CHAN
Definition: libavformat/iff.c:47
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:478
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: libavcodec/avcodec.h:1101
iff_read_header
static int iff_read_header(AVFormatContext *s)
Definition: libavformat/iff.c:154
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:73
AV_CODEC_ID_PCM_ALAW
Definition: libavcodec/avcodec.h:306
ID_TEXT
#define ID_TEXT
Definition: libavformat/iff.c:67
av_get_bits_per_sample
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: libavcodec/utils.c:2690
AVFormatContext::metadata
AVDictionary * metadata
Definition: avformat.h:1092
av_free
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:183
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:579
AV_CODEC_ID_IFF_ILBM
Definition: libavcodec/avcodec.h:239
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: libavutil/internal.h:123
AV_PIX_FMT_BGRA
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:99
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:144
avassert.h
simple assert() macros that are a bit more flexible than ISO C assert().
ID_FORM
#define ID_FORM
Definition: libavformat/iff.c:59
av_log
void av_log(void *avcl, int level, const char *fmt,...)
Send the specified message to the log if the level is less than or equal to the current av_log_level...
Definition: log.c:246
ID_ILBM
#define ID_ILBM
Definition: libavformat/iff.c:49
AV_PIX_FMT_ARGB
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:96
AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:97
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: libavcodec/avcodec.h:1057
AVCodecContext::channel_layout
uint64_t channel_layout
Audio channel layout.
Definition: libavcodec/avcodec.h:1922
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:469
AVStream::codec
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:662
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:336
FF_INPUT_BUFFER_PADDING_SIZE
#define FF_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: libavcodec/avcodec.h:561
IffDemuxContext::flags
unsigned flags
1 for EHB, 0 is no extra half darkening
Definition: libavformat/iff.c:105
ID_VHDR
#define ID_VHDR
Definition: libavformat/iff.c:44
ID_TVDC
#define ID_TVDC
Definition: libavformat/iff.c:73
AVCodecContext::bit_rate
int bit_rate
the average bitrate
Definition: libavcodec/avcodec.h:1192
channel_layout.h
audio channel layout utility functions
ID_ABIT
#define ID_ABIT
Definition: libavformat/iff.c:68
ID_BODY
#define ID_BODY
Definition: libavformat/iff.c:69
FFMIN
#define FFMIN(a, b)
Definition: common.h:58
ff_iff_demuxer
AVInputFormat ff_iff_demuxer
Definition: libavformat/iff.c:477
AV_DICT_DONT_STRDUP_VAL
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() and chilren.
Definition: dict.h:72
read_probe
static int read_probe(AVProbeData *pd)
Definition: libavformat/jvdec.c:54
ret
ret
Definition: avfilter.c:821
AVCodecContext::width
int width
picture width / height.
Definition: libavcodec/avcodec.h:1302
ID_AUTH
#define ID_AUTH
Definition: libavformat/iff.c:61
AV_RL32
#define AV_RL32
Definition: avr32/intreadwrite.h:146
AV_CODEC_ID_PCM_S16BE
Definition: libavcodec/avcodec.h:300
url_feof
int url_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:280
iff_read_packet
static int iff_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: libavformat/iff.c:437
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:517
AVStream
Stream structure.
Definition: avformat.h:643
AV_CODEC_ID_PCM_U8
Definition: libavcodec/avcodec.h:304
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
NULL
NULL
Definition: eval.c:55
svx8_compression_type
svx8_compression_type
Definition: libavformat/iff.c:89
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition: libavcodec/avcodec.h:1142
IffDemuxContext::bpp
unsigned bpp
bits per plane to decode (differs from bits_per_coded_sample if HAM)
Definition: libavformat/iff.c:103
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: libavcodec/avcodec.h:1145
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition: libavcodec/avcodec.h:1861
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:977
ID_RGBN
#define ID_RGBN
Definition: libavformat/iff.c:57
AV_CODEC_ID_PCM_MULAW
Definition: libavcodec/avcodec.h:305
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:148
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> (&#39;D&#39;<<24) + (&#39;C&#39;<<16) + (&#39;B&#39;<<8) + &#39;A&#39;).
Definition: libavcodec/avcodec.h:1160
bytestream_put_be16
static av_always_inline void bytestream_put_be16(uint8_t **b, const unsigned int value)
Definition: bytestream.h:91
buf
void * buf
Definition: avisynth_c.h:594
read_packet
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
av_dict_set
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:62
ID_MDAT
#define ID_MDAT
Definition: libavformat/iff.c:43
ID_DEEP
#define ID_DEEP
Definition: libavformat/iff.c:55
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:353
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:334
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFilterBuffer structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Buffer references ownership and permissions
ID_DGBL
#define ID_DGBL
Definition: libavformat/iff.c:51
ID_DLOC
#define ID_DLOC
Definition: libavformat/iff.c:72
flags
static int flags
Definition: cpu.c:23
deep_rgba
static const uint8_t deep_rgba[]
Definition: libavformat/iff.c:149
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score, half of that is used for file-extension-based detection
Definition: avformat.h:340
avformat.h
Main libavformat public API header.
IffDemuxContext::bitmap_compression
unsigned bitmap_compression
delta compression method used
Definition: libavformat/iff.c:102
deep_bgra
static const uint8_t deep_bgra[]
Definition: libavformat/iff.c:150
ID_CMAP
#define ID_CMAP
Definition: libavformat/iff.c:53
AVRational::den
int den
denominator
Definition: rational.h:45
bytestream_put_buffer
static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
Definition: bytestream.h:337
deep_rgb24
static const uint8_t deep_rgb24[]
Definition: libavformat/iff.c:148
AVCodecContext::channels
int channels
number of audio channels
Definition: libavcodec/avcodec.h:1862
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:964
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:461
ID_DPEL
#define ID_DPEL
Definition: libavformat/iff.c:71
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:143
get_metadata
static int get_metadata(AVFormatContext *s, const char *const tag, const unsigned data_size)
Definition: libavformat/iff.c:112
AV_CODEC_ID_8SVX_EXP
Definition: libavcodec/avcodec.h:436
deep_argb
static const uint8_t deep_argb[]
Definition: libavformat/iff.c:151
ID_COPYRIGHT
#define ID_COPYRIGHT
Definition: libavformat/iff.c:63
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:85
ID_BMHD
#define ID_BMHD
Definition: libavformat/iff.c:50
AVPacket
This structure stores compressed data.
Definition: libavcodec/avcodec.h:1028
AV_CODEC_ID_PCM_S16BE_PLANAR
Definition: libavcodec/avcodec.h:329
IffDemuxContext::masking
unsigned masking
masking method used
Definition: libavformat/iff.c:107
avpriv_request_sample
void avpriv_request_sample(void *avc, const char *msg,...)
Log a generic warning message about a missing feature.
Definition: log.c:297
Generated on Tue May 7 2024 06:51:48 for FFmpeg by   doxygen 1.8.11