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
34 #include "libavutil/channel_layout.h"
35 #include "libavutil/intreadwrite.h"
36 #include "libavutil/dict.h"
40 #define ID_8SVX MKTAG('8','S','V','X')
41 #define ID_VHDR MKTAG('V','H','D','R')
42 #define ID_ATAK MKTAG('A','T','A','K')
43 #define ID_RLSE MKTAG('R','L','S','E')
44 #define ID_CHAN MKTAG('C','H','A','N')
45 #define ID_PBM MKTAG('P','B','M',' ')
46 #define ID_ILBM MKTAG('I','L','B','M')
47 #define ID_BMHD MKTAG('B','M','H','D')
48 #define ID_CMAP MKTAG('C','M','A','P')
50 #define ID_FORM MKTAG('F','O','R','M')
51 #define ID_ANNO MKTAG('A','N','N','O')
52 #define ID_AUTH MKTAG('A','U','T','H')
53 #define ID_CHRS MKTAG('C','H','R','S')
54 #define ID_COPYRIGHT MKTAG('(','c',')',' ')
55 #define ID_CSET MKTAG('C','S','E','T')
56 #define ID_FVER MKTAG('F','V','E','R')
57 #define ID_NAME MKTAG('N','A','M','E')
58 #define ID_TEXT MKTAG('T','E','X','T')
59 #define ID_BODY MKTAG('B','O','D','Y')
60 #define ID_ANNO MKTAG('A','N','N','O')
70 } svx8_compression_type;
75 } bitmap_compression_type;
77 typedef struct IffDemuxContext {
84 /* Metadata string read */
85 static int get_metadata(AVFormatContext *s,
86 const char *const tag,
87 const unsigned data_size)
89 uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
92 return AVERROR(ENOMEM);
94 if (avio_read(s->pb, buf, data_size) < 0) {
99 av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
103 static int iff_probe(AVProbeData *p)
105 const uint8_t *d = p->buf;
107 if ( AV_RL32(d) == ID_FORM &&
108 (AV_RL32(d+8) == ID_8SVX || AV_RL32(d+8) == ID_PBM || AV_RL32(d+8) == ID_ILBM) )
109 return AVPROBE_SCORE_MAX;
113 static int iff_read_header(AVFormatContext *s)
115 IffDemuxContext *iff = s->priv_data;
116 AVIOContext *pb = s->pb;
118 uint32_t chunk_id, data_size;
119 int compression = -1;
121 st = avformat_new_stream(s, NULL);
123 return AVERROR(ENOMEM);
125 st->codec->channels = 1;
126 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
128 // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
129 st->codec->codec_tag = avio_rl32(pb);
131 while(!pb->eof_reached) {
134 const char *metadata_tag = NULL;
135 chunk_id = avio_rl32(pb);
136 data_size = avio_rb32(pb);
137 orig_pos = avio_tell(pb);
141 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
144 return AVERROR_INVALIDDATA;
146 st->codec->sample_rate = avio_rb16(pb);
147 if (data_size >= 16) {
149 compression = avio_r8(pb);
154 iff->body_pos = avio_tell(pb);
155 iff->body_size = data_size;
160 return AVERROR_INVALIDDATA;
161 if (avio_rb32(pb) < 6) {
162 st->codec->channels = 1;
163 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
165 st->codec->channels = 2;
166 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
171 if (data_size < 3 || data_size > 768 || data_size % 3) {
172 av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %"PRIu32"\n",
174 return AVERROR_INVALIDDATA;
176 st->codec->extradata_size = data_size;
177 st->codec->extradata = av_malloc(data_size);
178 if (!st->codec->extradata)
179 return AVERROR(ENOMEM);
180 if (avio_read(pb, st->codec->extradata, data_size) < 0)
185 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
187 return AVERROR_INVALIDDATA;
188 st->codec->width = avio_rb16(pb);
189 st->codec->height = avio_rb16(pb);
190 avio_skip(pb, 4); // x, y offset
191 st->codec->bits_per_coded_sample = avio_r8(pb);
192 if (data_size >= 11) {
193 avio_skip(pb, 1); // masking
194 compression = avio_r8(pb);
196 if (data_size >= 16) {
197 avio_skip(pb, 3); // paddding, transparent
198 st->sample_aspect_ratio.num = avio_r8(pb);
199 st->sample_aspect_ratio.den = avio_r8(pb);
205 metadata_tag = "comment";
209 metadata_tag = "artist";
213 metadata_tag = "copyright";
217 metadata_tag = "title";
222 if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
223 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!", metadata_tag);
227 avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
230 avio_seek(pb, iff->body_pos, SEEK_SET);
232 switch(st->codec->codec_type) {
233 case AVMEDIA_TYPE_AUDIO:
234 avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
236 switch(compression) {
238 st->codec->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
241 st->codec->codec_id = AV_CODEC_ID_8SVX_FIB;
244 st->codec->codec_id = AV_CODEC_ID_8SVX_EXP;
247 av_log(s, AV_LOG_ERROR, "unknown compression method\n");
251 st->codec->bits_per_coded_sample = 8;
252 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
253 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
256 case AVMEDIA_TYPE_VIDEO:
257 switch (compression) {
259 st->codec->codec_id = AV_CODEC_ID_IFF_ILBM;
261 case BITMAP_BYTERUN1:
262 st->codec->codec_id = AV_CODEC_ID_IFF_BYTERUN1;
265 av_log(s, AV_LOG_ERROR, "unknown compression method\n");
266 return AVERROR_INVALIDDATA;
276 static int iff_read_packet(AVFormatContext *s,
279 IffDemuxContext *iff = s->priv_data;
280 AVIOContext *pb = s->pb;
283 if(iff->sent_bytes >= iff->body_size)
286 ret = av_get_packet(pb, pkt, iff->body_size);
290 if(iff->sent_bytes == 0)
291 pkt->flags |= AV_PKT_FLAG_KEY;
292 iff->sent_bytes = iff->body_size;
294 pkt->stream_index = 0;
298 AVInputFormat ff_iff_demuxer = {
300 .long_name = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),
301 .priv_data_size = sizeof(IffDemuxContext),
302 .read_probe = iff_probe,
303 .read_header = iff_read_header,
304 .read_packet = iff_read_packet,