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1 | /* |
2 | * Binary text demuxer | |
3 | * eXtended BINary text (XBIN) demuxer | |
4 | * Artworx Data Format demuxer | |
5 | * iCEDraw File demuxer | |
6 | * Copyright (c) 2010 Peter Ross <pross@xvid.org> | |
7 | * | |
8 | * This file is part of FFmpeg. | |
9 | * | |
10 | * FFmpeg is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU Lesser General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2.1 of the License, or (at your option) any later version. | |
14 | * | |
15 | * FFmpeg is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public | |
21 | * License along with FFmpeg; if not, write to the Free Software | |
22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
23 | */ | |
24 | ||
25 | /** | |
26 | * @file | |
27 | * Binary text demuxer | |
28 | * eXtended BINary text (XBIN) demuxer | |
29 | * Artworx Data Format demuxer | |
30 | * iCEDraw File demuxer | |
31 | */ | |
32 | ||
33 | #include "libavutil/intreadwrite.h" | |
34 | #include "libavutil/opt.h" | |
35 | #include "libavutil/parseutils.h" | |
36 | #include "avformat.h" | |
37 | #include "internal.h" | |
38 | #include "sauce.h" | |
39 | #include "libavcodec/bintext.h" | |
40 | ||
41 | typedef struct { | |
42 | const AVClass *class; | |
43 | int chars_per_frame; /**< characters to send decoder per frame; | |
44 | set by private options as characters per second, and then | |
45 | converted to characters per frame at runtime */ | |
46 | int width, height; /**< video size (WxH pixels) (private option) */ | |
47 | AVRational framerate; /**< frames per second (private option) */ | |
48 | uint64_t fsize; /**< file size less metadata buffer */ | |
49 | } BinDemuxContext; | |
50 | ||
51 | static AVStream * init_stream(AVFormatContext *s) | |
52 | { | |
53 | BinDemuxContext *bin = s->priv_data; | |
54 | AVStream *st = avformat_new_stream(s, NULL); | |
55 | if (!st) | |
56 | return NULL; | |
57 | st->codec->codec_tag = 0; | |
58 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
59 | ||
60 | if (!bin->width) { | |
61 | st->codec->width = (80<<3); | |
62 | st->codec->height = (25<<4); | |
63 | } | |
64 | ||
65 | avpriv_set_pts_info(st, 60, bin->framerate.den, bin->framerate.num); | |
66 | ||
67 | /* simulate tty display speed */ | |
68 | bin->chars_per_frame = av_clip(av_q2d(st->time_base) * bin->chars_per_frame, 1, INT_MAX); | |
69 | ||
70 | return st; | |
71 | } | |
72 | ||
73 | #if CONFIG_BINTEXT_DEMUXER | CONFIG_ADF_DEMUXER | CONFIG_IDF_DEMUXER | |
74 | /** | |
75 | * Given filesize and width, calculate height (assume font_height of 16) | |
76 | */ | |
77 | static void calculate_height(AVCodecContext *avctx, uint64_t fsize) | |
78 | { | |
79 | avctx->height = (fsize / ((avctx->width>>3)*2)) << 4; | |
80 | } | |
81 | #endif | |
82 | ||
83 | #if CONFIG_BINTEXT_DEMUXER | |
84 | static const uint8_t next_magic[]={ | |
85 | 0x1A, 0x1B, '[', '0', ';', '3', '0', ';', '4', '0', 'm', 'N', 'E', 'X', 'T', 0x00 | |
86 | }; | |
87 | ||
88 | static int next_tag_read(AVFormatContext *avctx, uint64_t *fsize) | |
89 | { | |
90 | AVIOContext *pb = avctx->pb; | |
91 | char buf[36]; | |
92 | int len; | |
93 | uint64_t start_pos = avio_size(pb) - 256; | |
94 | ||
95 | avio_seek(pb, start_pos, SEEK_SET); | |
96 | if (avio_read(pb, buf, sizeof(next_magic)) != sizeof(next_magic)) | |
97 | return -1; | |
98 | if (memcmp(buf, next_magic, sizeof(next_magic))) | |
99 | return -1; | |
100 | if (avio_r8(pb) != 0x01) | |
101 | return -1; | |
102 | ||
103 | *fsize -= 256; | |
104 | ||
105 | #define GET_EFI2_META(name,size) \ | |
106 | len = avio_r8(pb); \ | |
107 | if (len < 1 || len > size) \ | |
108 | return -1; \ | |
109 | if (avio_read(pb, buf, size) == size && *buf) { \ | |
110 | buf[len] = 0; \ | |
111 | av_dict_set(&avctx->metadata, name, buf, 0); \ | |
112 | } | |
113 | ||
114 | GET_EFI2_META("filename", 12) | |
115 | GET_EFI2_META("author", 20) | |
116 | GET_EFI2_META("publisher", 20) | |
117 | GET_EFI2_META("title", 35) | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | static void predict_width(AVCodecContext *avctx, uint64_t fsize, int got_width) | |
123 | { | |
124 | /** attempt to guess width */ | |
125 | if (!got_width) | |
126 | avctx->width = fsize > 4000 ? (160<<3) : (80<<3); | |
127 | } | |
128 | ||
129 | static int bintext_read_header(AVFormatContext *s) | |
130 | { | |
131 | BinDemuxContext *bin = s->priv_data; | |
132 | AVIOContext *pb = s->pb; | |
133 | ||
134 | AVStream *st = init_stream(s); | |
135 | if (!st) | |
136 | return AVERROR(ENOMEM); | |
137 | st->codec->codec_id = AV_CODEC_ID_BINTEXT; | |
138 | ||
139 | if (ff_alloc_extradata(st->codec, 2)) | |
140 | return AVERROR(ENOMEM); | |
141 | st->codec->extradata[0] = 16; | |
142 | st->codec->extradata[1] = 0; | |
143 | ||
144 | if (pb->seekable) { | |
145 | int got_width = 0; | |
146 | bin->fsize = avio_size(pb); | |
147 | if (ff_sauce_read(s, &bin->fsize, &got_width, 0) < 0) | |
148 | next_tag_read(s, &bin->fsize); | |
149 | if (!bin->width) { | |
150 | predict_width(st->codec, bin->fsize, got_width); | |
151 | calculate_height(st->codec, bin->fsize); | |
152 | } | |
153 | avio_seek(pb, 0, SEEK_SET); | |
154 | } | |
155 | return 0; | |
156 | } | |
157 | #endif /* CONFIG_BINTEXT_DEMUXER */ | |
158 | ||
159 | #if CONFIG_XBIN_DEMUXER | |
160 | static int xbin_probe(AVProbeData *p) | |
161 | { | |
162 | const uint8_t *d = p->buf; | |
163 | ||
164 | if (AV_RL32(d) == MKTAG('X','B','I','N') && d[4] == 0x1A && | |
165 | AV_RL16(d+5) > 0 && AV_RL16(d+5) <= 160 && | |
166 | d[9] > 0 && d[9] <= 32) | |
167 | return AVPROBE_SCORE_MAX; | |
168 | return 0; | |
169 | } | |
170 | ||
171 | static int xbin_read_header(AVFormatContext *s) | |
172 | { | |
173 | BinDemuxContext *bin = s->priv_data; | |
174 | AVIOContext *pb = s->pb; | |
175 | char fontheight, flags; | |
176 | ||
177 | AVStream *st = init_stream(s); | |
178 | if (!st) | |
179 | return AVERROR(ENOMEM); | |
180 | ||
181 | avio_skip(pb, 5); | |
182 | st->codec->width = avio_rl16(pb)<<3; | |
183 | st->codec->height = avio_rl16(pb); | |
184 | fontheight = avio_r8(pb); | |
185 | st->codec->height *= fontheight; | |
186 | flags = avio_r8(pb); | |
187 | ||
188 | st->codec->extradata_size = 2; | |
189 | if ((flags & BINTEXT_PALETTE)) | |
190 | st->codec->extradata_size += 48; | |
191 | if ((flags & BINTEXT_FONT)) | |
192 | st->codec->extradata_size += fontheight * (flags & 0x10 ? 512 : 256); | |
193 | st->codec->codec_id = flags & 4 ? AV_CODEC_ID_XBIN : AV_CODEC_ID_BINTEXT; | |
194 | ||
195 | if (ff_alloc_extradata(st->codec, st->codec->extradata_size)) | |
196 | return AVERROR(ENOMEM); | |
197 | st->codec->extradata[0] = fontheight; | |
198 | st->codec->extradata[1] = flags; | |
199 | if (avio_read(pb, st->codec->extradata + 2, st->codec->extradata_size - 2) < 0) | |
200 | return AVERROR(EIO); | |
201 | ||
202 | if (pb->seekable) { | |
203 | bin->fsize = avio_size(pb) - 9 - st->codec->extradata_size; | |
204 | ff_sauce_read(s, &bin->fsize, NULL, 0); | |
205 | avio_seek(pb, 9 + st->codec->extradata_size, SEEK_SET); | |
206 | } | |
207 | ||
208 | return 0; | |
209 | } | |
210 | #endif /* CONFIG_XBIN_DEMUXER */ | |
211 | ||
212 | #if CONFIG_ADF_DEMUXER | |
213 | static int adf_read_header(AVFormatContext *s) | |
214 | { | |
215 | BinDemuxContext *bin = s->priv_data; | |
216 | AVIOContext *pb = s->pb; | |
217 | AVStream *st; | |
218 | ||
219 | if (avio_r8(pb) != 1) | |
220 | return AVERROR_INVALIDDATA; | |
221 | ||
222 | st = init_stream(s); | |
223 | if (!st) | |
224 | return AVERROR(ENOMEM); | |
225 | st->codec->codec_id = AV_CODEC_ID_BINTEXT; | |
226 | ||
227 | if (ff_alloc_extradata(st->codec, 2 + 48 + 4096)) | |
228 | return AVERROR(ENOMEM); | |
229 | st->codec->extradata[0] = 16; | |
230 | st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT; | |
231 | ||
232 | if (avio_read(pb, st->codec->extradata + 2, 24) < 0) | |
233 | return AVERROR(EIO); | |
234 | avio_skip(pb, 144); | |
235 | if (avio_read(pb, st->codec->extradata + 2 + 24, 24) < 0) | |
236 | return AVERROR(EIO); | |
237 | if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0) | |
238 | return AVERROR(EIO); | |
239 | ||
240 | if (pb->seekable) { | |
241 | int got_width = 0; | |
242 | bin->fsize = avio_size(pb) - 1 - 192 - 4096; | |
243 | st->codec->width = 80<<3; | |
244 | ff_sauce_read(s, &bin->fsize, &got_width, 0); | |
245 | if (!bin->width) | |
246 | calculate_height(st->codec, bin->fsize); | |
247 | avio_seek(pb, 1 + 192 + 4096, SEEK_SET); | |
248 | } | |
249 | return 0; | |
250 | } | |
251 | #endif /* CONFIG_ADF_DEMUXER */ | |
252 | ||
253 | #if CONFIG_IDF_DEMUXER | |
254 | static const uint8_t idf_magic[] = { | |
255 | 0x04, 0x31, 0x2e, 0x34, 0x00, 0x00, 0x00, 0x00, 0x4f, 0x00, 0x15, 0x00 | |
256 | }; | |
257 | ||
258 | static int idf_probe(AVProbeData *p) | |
259 | { | |
260 | if (p->buf_size < sizeof(idf_magic)) | |
261 | return 0; | |
262 | if (!memcmp(p->buf, idf_magic, sizeof(idf_magic))) | |
263 | return AVPROBE_SCORE_MAX; | |
264 | return 0; | |
265 | } | |
266 | ||
267 | static int idf_read_header(AVFormatContext *s) | |
268 | { | |
269 | BinDemuxContext *bin = s->priv_data; | |
270 | AVIOContext *pb = s->pb; | |
271 | AVStream *st; | |
272 | int got_width = 0; | |
273 | ||
274 | if (!pb->seekable) | |
275 | return AVERROR(EIO); | |
276 | ||
277 | st = init_stream(s); | |
278 | if (!st) | |
279 | return AVERROR(ENOMEM); | |
280 | st->codec->codec_id = AV_CODEC_ID_IDF; | |
281 | ||
282 | if (ff_alloc_extradata(st->codec, 2 + 48 + 4096)) | |
283 | return AVERROR(ENOMEM); | |
284 | st->codec->extradata[0] = 16; | |
285 | st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT; | |
286 | ||
287 | avio_seek(pb, avio_size(pb) - 4096 - 48, SEEK_SET); | |
288 | ||
289 | if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0) | |
290 | return AVERROR(EIO); | |
291 | if (avio_read(pb, st->codec->extradata + 2, 48) < 0) | |
292 | return AVERROR(EIO); | |
293 | ||
294 | bin->fsize = avio_size(pb) - 12 - 4096 - 48; | |
295 | ff_sauce_read(s, &bin->fsize, &got_width, 0); | |
296 | if (!bin->width) | |
297 | calculate_height(st->codec, bin->fsize); | |
298 | avio_seek(pb, 12, SEEK_SET); | |
299 | return 0; | |
300 | } | |
301 | #endif /* CONFIG_IDF_DEMUXER */ | |
302 | ||
303 | static int read_packet(AVFormatContext *s, | |
304 | AVPacket *pkt) | |
305 | { | |
306 | BinDemuxContext *bin = s->priv_data; | |
307 | ||
308 | if (bin->fsize > 0) { | |
309 | if (av_get_packet(s->pb, pkt, bin->fsize) < 0) | |
310 | return AVERROR(EIO); | |
311 | bin->fsize = -1; /* done */ | |
312 | } else if (!bin->fsize) { | |
313 | if (avio_feof(s->pb)) | |
314 | return AVERROR(EIO); | |
315 | if (av_get_packet(s->pb, pkt, bin->chars_per_frame) < 0) | |
316 | return AVERROR(EIO); | |
317 | } else { | |
318 | return AVERROR(EIO); | |
319 | } | |
320 | ||
321 | pkt->flags |= AV_PKT_FLAG_KEY; | |
322 | return 0; | |
323 | } | |
324 | ||
325 | #define OFFSET(x) offsetof(BinDemuxContext, x) | |
326 | static const AVOption options[] = { | |
327 | { "linespeed", "set simulated line speed (bytes per second)", OFFSET(chars_per_frame), AV_OPT_TYPE_INT, {.i64 = 6000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM}, | |
328 | { "video_size", "set video size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM }, | |
329 | { "framerate", "set framerate (frames per second)", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, AV_OPT_FLAG_DECODING_PARAM }, | |
330 | { NULL }, | |
331 | }; | |
332 | ||
333 | #define CLASS(name) \ | |
334 | (const AVClass[1]){{ \ | |
335 | .class_name = name, \ | |
336 | .item_name = av_default_item_name, \ | |
337 | .option = options, \ | |
338 | .version = LIBAVUTIL_VERSION_INT, \ | |
339 | }} | |
340 | ||
341 | #if CONFIG_BINTEXT_DEMUXER | |
342 | AVInputFormat ff_bintext_demuxer = { | |
343 | .name = "bin", | |
344 | .long_name = NULL_IF_CONFIG_SMALL("Binary text"), | |
345 | .priv_data_size = sizeof(BinDemuxContext), | |
346 | .read_header = bintext_read_header, | |
347 | .read_packet = read_packet, | |
348 | .extensions = "bin", | |
349 | .priv_class = CLASS("Binary text demuxer"), | |
350 | }; | |
351 | #endif | |
352 | ||
353 | #if CONFIG_XBIN_DEMUXER | |
354 | AVInputFormat ff_xbin_demuxer = { | |
355 | .name = "xbin", | |
356 | .long_name = NULL_IF_CONFIG_SMALL("eXtended BINary text (XBIN)"), | |
357 | .priv_data_size = sizeof(BinDemuxContext), | |
358 | .read_probe = xbin_probe, | |
359 | .read_header = xbin_read_header, | |
360 | .read_packet = read_packet, | |
361 | .priv_class = CLASS("eXtended BINary text (XBIN) demuxer"), | |
362 | }; | |
363 | #endif | |
364 | ||
365 | #if CONFIG_ADF_DEMUXER | |
366 | AVInputFormat ff_adf_demuxer = { | |
367 | .name = "adf", | |
368 | .long_name = NULL_IF_CONFIG_SMALL("Artworx Data Format"), | |
369 | .priv_data_size = sizeof(BinDemuxContext), | |
370 | .read_header = adf_read_header, | |
371 | .read_packet = read_packet, | |
372 | .extensions = "adf", | |
373 | .priv_class = CLASS("Artworx Data Format demuxer"), | |
374 | }; | |
375 | #endif | |
376 | ||
377 | #if CONFIG_IDF_DEMUXER | |
378 | AVInputFormat ff_idf_demuxer = { | |
379 | .name = "idf", | |
380 | .long_name = NULL_IF_CONFIG_SMALL("iCE Draw File"), | |
381 | .priv_data_size = sizeof(BinDemuxContext), | |
382 | .read_probe = idf_probe, | |
383 | .read_header = idf_read_header, | |
384 | .read_packet = read_packet, | |
385 | .extensions = "idf", | |
386 | .priv_class = CLASS("iCE Draw File demuxer"), | |
387 | }; | |
388 | #endif |