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>
7 * This file is part of Libav.
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.
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.
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
27 * by Jaikrishnan Menon
28 * for more information on the .iff file format, visit:
29 * http://wiki.multimedia.cx/index.php?title=IFF
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/dict.h"
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')
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')
67 } svx8_compression_type;
72 } bitmap_compression_type;
81 /* Metadata string read */
82 static int get_metadata(AVFormatContext *s,
83 const char *const tag,
84 const unsigned data_size)
86 uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
89 return AVERROR(ENOMEM);
91 if (avio_read(s->pb, buf, data_size) < 0) {
96 av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
100 static int iff_probe(AVProbeData *p)
102 const uint8_t *d = p->buf;
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;
110 static int iff_read_header(AVFormatContext *s,
111 AVFormatParameters *ap)
113 IffDemuxContext *iff = s->priv_data;
114 AVIOContext *pb = s->pb;
116 uint32_t chunk_id, data_size;
117 int compression = -1;
119 st = avformat_new_stream(s, NULL);
121 return AVERROR(ENOMEM);
123 st->codec->channels = 1;
125 // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
126 st->codec->codec_tag = avio_rl32(pb);
128 while(!pb->eof_reached) {
131 const char *metadata_tag = NULL;
132 chunk_id = avio_rl32(pb);
133 data_size = avio_rb32(pb);
134 orig_pos = avio_tell(pb);
138 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
141 return AVERROR_INVALIDDATA;
143 st->codec->sample_rate = avio_rb16(pb);
144 if (data_size >= 16) {
146 compression = avio_r8(pb);
151 iff->body_pos = avio_tell(pb);
152 iff->body_size = data_size;
157 return AVERROR_INVALIDDATA;
158 st->codec->channels = (avio_rb32(pb) < 6) ? 1 : 2;
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)
171 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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
177 st->codec->bits_per_coded_sample = avio_r8(pb);
178 if (data_size >= 11) {
179 avio_skip(pb, 1); // masking
180 compression = avio_r8(pb);
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);
191 metadata_tag = "comment";
195 metadata_tag = "artist";
199 metadata_tag = "copyright";
203 metadata_tag = "title";
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);
213 avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
216 avio_seek(pb, iff->body_pos, SEEK_SET);
218 switch(st->codec->codec_type) {
219 case AVMEDIA_TYPE_AUDIO:
220 avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
222 switch(compression) {
224 st->codec->codec_id = CODEC_ID_PCM_S8_PLANAR;
227 st->codec->codec_id = CODEC_ID_8SVX_FIB;
230 st->codec->codec_id = CODEC_ID_8SVX_EXP;
233 av_log(s, AV_LOG_ERROR, "unknown compression method\n");
237 st->codec->bits_per_coded_sample = 8;
238 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
239 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
242 case AVMEDIA_TYPE_VIDEO:
243 switch (compression) {
245 st->codec->codec_id = CODEC_ID_IFF_ILBM;
247 case BITMAP_BYTERUN1:
248 st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;
251 av_log(s, AV_LOG_ERROR, "unknown compression method\n");
252 return AVERROR_INVALIDDATA;
262 static int iff_read_packet(AVFormatContext *s,
265 IffDemuxContext *iff = s->priv_data;
266 AVIOContext *pb = s->pb;
269 if(iff->sent_bytes >= iff->body_size)
272 ret = av_get_packet(pb, pkt, iff->body_size);
276 if(iff->sent_bytes == 0)
277 pkt->flags |= AV_PKT_FLAG_KEY;
278 iff->sent_bytes = iff->body_size;
280 pkt->stream_index = 0;
284 AVInputFormat ff_iff_demuxer = {
286 .long_name = NULL_IF_CONFIG_SMALL("IFF format"),
287 .priv_data_size = sizeof(IffDemuxContext),
288 .read_probe = iff_probe,
289 .read_header = iff_read_header,
290 .read_packet = iff_read_packet,