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>
6 * This file is part of FFmpeg.
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.
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.
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
26 * by Jaikrishnan Menon
27 * for more information on the .iff file format, visit:
28 * http://wiki.multimedia.cx/index.php?title=IFF
31 #include "libavcodec/bytestream.h"
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_DGBL MKTAG('D','G','B','L')
46 #define ID_CAMG MKTAG('C','A','M','G')
47 #define ID_CMAP MKTAG('C','M','A','P')
48 #define ID_ACBM MKTAG('A','C','B','M')
49 #define ID_DEEP MKTAG('D','E','E','P')
51 #define ID_FORM MKTAG('F','O','R','M')
52 #define ID_ANNO MKTAG('A','N','N','O')
53 #define ID_AUTH MKTAG('A','U','T','H')
54 #define ID_CHRS MKTAG('C','H','R','S')
55 #define ID_COPYRIGHT MKTAG('(','c',')',' ')
56 #define ID_CSET MKTAG('C','S','E','T')
57 #define ID_FVER MKTAG('F','V','E','R')
58 #define ID_NAME MKTAG('N','A','M','E')
59 #define ID_TEXT MKTAG('T','E','X','T')
60 #define ID_ABIT MKTAG('A','B','I','T')
61 #define ID_BODY MKTAG('B','O','D','Y')
62 #define ID_DBOD MKTAG('D','B','O','D')
63 #define ID_DPEL MKTAG('D','P','E','L')
70 * This number of bytes if added at the beginning of each AVPacket
71 * which contain additional information about video properties
72 * which has to be shared between demuxer and decoder.
73 * This number may change between frames, e.g. the demuxer might
74 * set it to smallest possible size of 2 to indicate that there's
75 * no extradata changing in this frame.
77 #define IFF_EXTRA_VIDEO_SIZE 9
83 } svx8_compression_type;
88 } bitmap_compression_type;
94 svx8_compression_type svx8_compression;
95 bitmap_compression_type bitmap_compression; ///< delta compression method used
96 unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
97 unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
98 unsigned flags; ///< 1 for EHB, 0 is no extra half darkening
99 unsigned transparency; ///< transparency color index in palette
100 unsigned masking; ///< masking method used
103 /* Metadata string read */
104 static int get_metadata(AVFormatContext *s,
105 const char *const tag,
106 const unsigned data_size)
108 uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
111 return AVERROR(ENOMEM);
113 if (avio_read(s->pb, buf, data_size) < 0) {
118 av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
122 static int iff_probe(AVProbeData *p)
124 const uint8_t *d = p->buf;
126 if ( AV_RL32(d) == ID_FORM &&
127 (AV_RL32(d+8) == ID_8SVX ||
128 AV_RL32(d+8) == ID_PBM ||
129 AV_RL32(d+8) == ID_ACBM ||
130 AV_RL32(d+8) == ID_DEEP ||
131 AV_RL32(d+8) == ID_ILBM) )
132 return AVPROBE_SCORE_MAX;
136 static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
137 static const uint8_t deep_rgba[] = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
139 static int iff_read_header(AVFormatContext *s)
141 IffDemuxContext *iff = s->priv_data;
142 AVIOContext *pb = s->pb;
145 uint32_t chunk_id, data_size;
146 uint32_t screenmode = 0;
147 unsigned transparency = 0;
148 unsigned masking = 0; // no mask
152 st = avformat_new_stream(s, NULL);
154 return AVERROR(ENOMEM);
156 st->codec->channels = 1;
158 // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
159 st->codec->codec_tag = avio_rl32(pb);
161 while(!url_feof(pb)) {
164 const char *metadata_tag = NULL;
165 chunk_id = avio_rl32(pb);
166 data_size = avio_rb32(pb);
167 orig_pos = avio_tell(pb);
171 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
174 return AVERROR_INVALIDDATA;
176 st->codec->sample_rate = avio_rb16(pb);
177 if (data_size >= 16) {
179 iff->svx8_compression = avio_r8(pb);
186 iff->body_pos = avio_tell(pb);
187 iff->body_size = data_size;
192 return AVERROR_INVALIDDATA;
193 st->codec->channels = (avio_rb32(pb) < 6) ? 1 : 2;
198 return AVERROR_INVALIDDATA;
199 screenmode = avio_rb32(pb);
203 st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
204 st->codec->extradata = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
205 if (!st->codec->extradata)
206 return AVERROR(ENOMEM);
207 if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)
212 iff->bitmap_compression = -1;
213 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
215 return AVERROR_INVALIDDATA;
216 st->codec->width = avio_rb16(pb);
217 st->codec->height = avio_rb16(pb);
218 avio_skip(pb, 4); // x, y offset
219 st->codec->bits_per_coded_sample = avio_r8(pb);
221 masking = avio_r8(pb);
223 iff->bitmap_compression = avio_r8(pb);
224 if (data_size >= 14) {
225 avio_skip(pb, 1); // padding
226 transparency = avio_rb16(pb);
228 if (data_size >= 16) {
229 st->sample_aspect_ratio.num = avio_r8(pb);
230 st->sample_aspect_ratio.den = avio_r8(pb);
235 if (data_size < 4 || (data_size & 3))
236 return AVERROR_INVALIDDATA;
237 if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)
239 if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))
240 st->codec->pix_fmt = PIX_FMT_RGB24;
241 else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))
242 st->codec->pix_fmt = PIX_FMT_RGBA;
244 av_log_ask_for_sample(s, "unsupported color format\n");
245 return AVERROR_PATCHWELCOME;
250 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
252 return AVERROR_INVALIDDATA;
253 st->codec->width = avio_rb16(pb);
254 st->codec->height = avio_rb16(pb);
255 iff->bitmap_compression = avio_rb16(pb);
256 if (iff->bitmap_compression != 0) {
257 av_log(s, AV_LOG_ERROR,
258 "compression %i not supported\n", iff->bitmap_compression);
259 return AVERROR_PATCHWELCOME;
261 st->sample_aspect_ratio.num = avio_r8(pb);
262 st->sample_aspect_ratio.den = avio_r8(pb);
263 st->codec->bits_per_coded_sample = 24;
267 case ID_TEXT: metadata_tag = "comment"; break;
268 case ID_AUTH: metadata_tag = "artist"; break;
269 case ID_COPYRIGHT: metadata_tag = "copyright"; break;
270 case ID_NAME: metadata_tag = "title"; break;
274 if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
275 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!", metadata_tag);
279 avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
282 avio_seek(pb, iff->body_pos, SEEK_SET);
284 switch(st->codec->codec_type) {
285 case AVMEDIA_TYPE_AUDIO:
286 avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
288 switch (iff->svx8_compression) {
290 st->codec->codec_id = CODEC_ID_PCM_S8_PLANAR;
293 st->codec->codec_id = CODEC_ID_8SVX_FIB;
296 st->codec->codec_id = CODEC_ID_8SVX_EXP;
299 av_log(s, AV_LOG_ERROR,
300 "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
304 st->codec->bits_per_coded_sample = iff->svx8_compression == COMP_NONE ? 8 : 4;
305 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
306 st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
309 case AVMEDIA_TYPE_VIDEO:
310 iff->bpp = st->codec->bits_per_coded_sample;
311 if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
312 iff->ham = iff->bpp > 6 ? 6 : 4;
313 st->codec->bits_per_coded_sample = 24;
315 iff->flags = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
316 iff->masking = masking;
317 iff->transparency = transparency;
319 if (!st->codec->extradata) {
320 st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
321 st->codec->extradata = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
322 if (!st->codec->extradata)
323 return AVERROR(ENOMEM);
325 buf = st->codec->extradata;
326 bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
327 bytestream_put_byte(&buf, iff->bitmap_compression);
328 bytestream_put_byte(&buf, iff->bpp);
329 bytestream_put_byte(&buf, iff->ham);
330 bytestream_put_byte(&buf, iff->flags);
331 bytestream_put_be16(&buf, iff->transparency);
332 bytestream_put_byte(&buf, iff->masking);
334 switch (iff->bitmap_compression) {
336 st->codec->codec_id = CODEC_ID_IFF_ILBM;
338 case BITMAP_BYTERUN1:
339 st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;
342 av_log(s, AV_LOG_ERROR,
343 "Unknown bitmap compression method '%d'\n", iff->bitmap_compression);
344 return AVERROR_INVALIDDATA;
354 static int iff_read_packet(AVFormatContext *s,
357 IffDemuxContext *iff = s->priv_data;
358 AVIOContext *pb = s->pb;
359 AVStream *st = s->streams[0];
362 if(iff->sent_bytes >= iff->body_size)
365 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
366 ret = av_get_packet(pb, pkt, iff->body_size);
367 } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
370 if (av_new_packet(pkt, iff->body_size + 2) < 0) {
371 return AVERROR(ENOMEM);
375 bytestream_put_be16(&buf, 2);
376 ret = avio_read(pb, buf, iff->body_size);
381 if(iff->sent_bytes == 0)
382 pkt->flags |= AV_PKT_FLAG_KEY;
383 iff->sent_bytes = iff->body_size;
385 pkt->stream_index = 0;
389 AVInputFormat ff_iff_demuxer = {
391 .long_name = NULL_IF_CONFIG_SMALL("Interchange File Format"),
392 .priv_data_size = sizeof(IffDemuxContext),
393 .read_probe = iff_probe,
394 .read_header = iff_read_header,
395 .read_packet = iff_read_packet,