iff.c
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1 /*
2  * IFF (.iff) file demuxer
3  * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
4  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
5  * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
6  *
7  * This file is part of Libav.
8  *
9  * Libav is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * Libav is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with Libav; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/dict.h"
34 #include "avformat.h"
35 #include "internal.h"
36 
37 #define ID_8SVX MKTAG('8','S','V','X')
38 #define ID_VHDR MKTAG('V','H','D','R')
39 #define ID_ATAK MKTAG('A','T','A','K')
40 #define ID_RLSE MKTAG('R','L','S','E')
41 #define ID_CHAN MKTAG('C','H','A','N')
42 #define ID_PBM MKTAG('P','B','M',' ')
43 #define ID_ILBM MKTAG('I','L','B','M')
44 #define ID_BMHD MKTAG('B','M','H','D')
45 #define ID_CMAP MKTAG('C','M','A','P')
46 
47 #define ID_FORM MKTAG('F','O','R','M')
48 #define ID_ANNO MKTAG('A','N','N','O')
49 #define ID_AUTH MKTAG('A','U','T','H')
50 #define ID_CHRS MKTAG('C','H','R','S')
51 #define ID_COPYRIGHT MKTAG('(','c',')',' ')
52 #define ID_CSET MKTAG('C','S','E','T')
53 #define ID_FVER MKTAG('F','V','E','R')
54 #define ID_NAME MKTAG('N','A','M','E')
55 #define ID_TEXT MKTAG('T','E','X','T')
56 #define ID_BODY MKTAG('B','O','D','Y')
57 #define ID_ANNO MKTAG('A','N','N','O')
58 
59 #define LEFT 2
60 #define RIGHT 4
61 #define STEREO 6
62 
63 typedef enum {
68 
69 typedef enum {
73 
74 typedef struct {
75  uint64_t body_pos;
76  uint32_t body_size;
77  uint32_t sent_bytes;
79 
80 
81 /* Metadata string read */
83  const char *const tag,
84  const unsigned data_size)
85 {
86  uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
87 
88  if (!buf)
89  return AVERROR(ENOMEM);
90 
91  if (avio_read(s->pb, buf, data_size) < 0) {
92  av_free(buf);
93  return AVERROR(EIO);
94  }
95  buf[data_size] = 0;
97  return 0;
98 }
99 
100 static int iff_probe(AVProbeData *p)
101 {
102  const uint8_t *d = p->buf;
103 
104  if ( AV_RL32(d) == ID_FORM &&
105  (AV_RL32(d+8) == ID_8SVX || AV_RL32(d+8) == ID_PBM || AV_RL32(d+8) == ID_ILBM) )
106  return AVPROBE_SCORE_MAX;
107  return 0;
108 }
109 
111  AVFormatParameters *ap)
112 {
113  IffDemuxContext *iff = s->priv_data;
114  AVIOContext *pb = s->pb;
115  AVStream *st;
116  uint32_t chunk_id, data_size;
117  int compression = -1;
118 
119  st = avformat_new_stream(s, NULL);
120  if (!st)
121  return AVERROR(ENOMEM);
122 
123  st->codec->channels = 1;
124  avio_skip(pb, 8);
125  // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
126  st->codec->codec_tag = avio_rl32(pb);
127 
128  while(!pb->eof_reached) {
129  uint64_t orig_pos;
130  int res;
131  const char *metadata_tag = NULL;
132  chunk_id = avio_rl32(pb);
133  data_size = avio_rb32(pb);
134  orig_pos = avio_tell(pb);
135 
136  switch(chunk_id) {
137  case ID_VHDR:
139 
140  if (data_size < 14)
141  return AVERROR_INVALIDDATA;
142  avio_skip(pb, 12);
143  st->codec->sample_rate = avio_rb16(pb);
144  if (data_size >= 16) {
145  avio_skip(pb, 1);
146  compression = avio_r8(pb);
147  }
148  break;
149 
150  case ID_BODY:
151  iff->body_pos = avio_tell(pb);
152  iff->body_size = data_size;
153  break;
154 
155  case ID_CHAN:
156  if (data_size < 4)
157  return AVERROR_INVALIDDATA;
158  st->codec->channels = (avio_rb32(pb) < 6) ? 1 : 2;
159  break;
160 
161  case ID_CMAP:
162  st->codec->extradata_size = data_size;
163  st->codec->extradata = av_malloc(data_size);
164  if (!st->codec->extradata)
165  return AVERROR(ENOMEM);
166  if (avio_read(pb, st->codec->extradata, data_size) < 0)
167  return AVERROR(EIO);
168  break;
169 
170  case ID_BMHD:
172  if (data_size <= 8)
173  return AVERROR_INVALIDDATA;
174  st->codec->width = avio_rb16(pb);
175  st->codec->height = avio_rb16(pb);
176  avio_skip(pb, 4); // x, y offset
178  if (data_size >= 11) {
179  avio_skip(pb, 1); // masking
180  compression = avio_r8(pb);
181  }
182  if (data_size >= 16) {
183  avio_skip(pb, 3); // paddding, transparent
184  st->sample_aspect_ratio.num = avio_r8(pb);
185  st->sample_aspect_ratio.den = avio_r8(pb);
186  }
187  break;
188 
189  case ID_ANNO:
190  case ID_TEXT:
191  metadata_tag = "comment";
192  break;
193 
194  case ID_AUTH:
195  metadata_tag = "artist";
196  break;
197 
198  case ID_COPYRIGHT:
199  metadata_tag = "copyright";
200  break;
201 
202  case ID_NAME:
203  metadata_tag = "title";
204  break;
205  }
206 
207  if (metadata_tag) {
208  if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
209  av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!", metadata_tag);
210  return res;
211  }
212  }
213  avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
214  }
215 
216  avio_seek(pb, iff->body_pos, SEEK_SET);
217 
218  switch(st->codec->codec_type) {
219  case AVMEDIA_TYPE_AUDIO:
220  avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
221 
222  switch(compression) {
223  case COMP_NONE:
225  break;
226  case COMP_FIB:
227  st->codec->codec_id = CODEC_ID_8SVX_FIB;
228  break;
229  case COMP_EXP:
230  st->codec->codec_id = CODEC_ID_8SVX_EXP;
231  break;
232  default:
233  av_log(s, AV_LOG_ERROR, "unknown compression method\n");
234  return -1;
235  }
236 
237  st->codec->bits_per_coded_sample = 8;
240  break;
241 
242  case AVMEDIA_TYPE_VIDEO:
243  switch (compression) {
244  case BITMAP_RAW:
246  break;
247  case BITMAP_BYTERUN1:
249  break;
250  default:
251  av_log(s, AV_LOG_ERROR, "unknown compression method\n");
252  return AVERROR_INVALIDDATA;
253  }
254  break;
255  default:
256  return -1;
257  }
258 
259  return 0;
260 }
261 
263  AVPacket *pkt)
264 {
265  IffDemuxContext *iff = s->priv_data;
266  AVIOContext *pb = s->pb;
267  int ret;
268 
269  if(iff->sent_bytes >= iff->body_size)
270  return AVERROR_EOF;
271 
272  ret = av_get_packet(pb, pkt, iff->body_size);
273  if (ret < 0)
274  return ret;
275 
276  if(iff->sent_bytes == 0)
277  pkt->flags |= AV_PKT_FLAG_KEY;
278  iff->sent_bytes = iff->body_size;
279 
280  pkt->stream_index = 0;
281  return ret;
282 }
283 
285  .name = "IFF",
286  .long_name = NULL_IF_CONFIG_SMALL("IFF format"),
287  .priv_data_size = sizeof(IffDemuxContext),
291 };