| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Multipart JPEG format | ||
| 3 | * Copyright (c) 2015 Luca Barbato | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "libavutil/avstring.h" | ||
| 23 | #include "libavutil/mem.h" | ||
| 24 | #include "libavutil/opt.h" | ||
| 25 | |||
| 26 | #include "avformat.h" | ||
| 27 | #include "demux.h" | ||
| 28 | #include "internal.h" | ||
| 29 | #include "avio_internal.h" | ||
| 30 | |||
| 31 | typedef struct MPJPEGDemuxContext { | ||
| 32 | const AVClass *class; | ||
| 33 | char *boundary; | ||
| 34 | char *searchstr; | ||
| 35 | int searchstr_len; | ||
| 36 | int strict_mime_boundary; | ||
| 37 | } MPJPEGDemuxContext; | ||
| 38 | |||
| 39 | 2 | static void trim_right(char *p) | |
| 40 | { | ||
| 41 | char *end; | ||
| 42 | |||
| 43 |
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2 | if (!p || !*p) |
| 44 | ✗ | return; | |
| 45 | |||
| 46 | 2 | end = p + strlen(p); | |
| 47 |
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4 | while (end > p && av_isspace(*(end-1))) |
| 48 | 2 | *(--end) = '\0'; | |
| 49 | } | ||
| 50 | |||
| 51 | 2 | static int get_line(AVIOContext *pb, char *line, int line_size) | |
| 52 | { | ||
| 53 | 2 | ff_get_line(pb, line, line_size); | |
| 54 | |||
| 55 |
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2 | if (pb->error) |
| 56 | ✗ | return pb->error; | |
| 57 | |||
| 58 |
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2 | if (pb->eof_reached) |
| 59 | ✗ | return AVERROR_EOF; | |
| 60 | |||
| 61 | 2 | trim_right(line); | |
| 62 | 2 | return 0; | |
| 63 | } | ||
| 64 | |||
| 65 | ✗ | static int split_tag_value(char **tag, char **value, char *line) | |
| 66 | { | ||
| 67 | ✗ | char *p = line; | |
| 68 | ✗ | int foundData = 0; | |
| 69 | |||
| 70 | ✗ | *tag = NULL; | |
| 71 | ✗ | *value = NULL; | |
| 72 | |||
| 73 | ✗ | while (*p != '\0' && *p != ':') { | |
| 74 | ✗ | if (!av_isspace(*p)) { | |
| 75 | ✗ | foundData = 1; | |
| 76 | } | ||
| 77 | ✗ | p++; | |
| 78 | } | ||
| 79 | ✗ | if (*p != ':') | |
| 80 | ✗ | return foundData ? AVERROR_INVALIDDATA : 0; | |
| 81 | |||
| 82 | ✗ | *p = '\0'; | |
| 83 | ✗ | *tag = line; | |
| 84 | ✗ | trim_right(*tag); | |
| 85 | |||
| 86 | ✗ | p++; | |
| 87 | |||
| 88 | ✗ | while (av_isspace(*p)) | |
| 89 | ✗ | p++; | |
| 90 | |||
| 91 | ✗ | *value = p; | |
| 92 | ✗ | trim_right(*value); | |
| 93 | |||
| 94 | ✗ | return 0; | |
| 95 | } | ||
| 96 | |||
| 97 | static int parse_multipart_header(AVIOContext *pb, | ||
| 98 | int* size, | ||
| 99 | const char* expected_boundary, | ||
| 100 | void *log_ctx); | ||
| 101 | |||
| 102 | ✗ | static int mpjpeg_read_close(AVFormatContext *s) | |
| 103 | { | ||
| 104 | ✗ | MPJPEGDemuxContext *mpjpeg = s->priv_data; | |
| 105 | ✗ | av_freep(&mpjpeg->boundary); | |
| 106 | ✗ | av_freep(&mpjpeg->searchstr); | |
| 107 | ✗ | return 0; | |
| 108 | } | ||
| 109 | |||
| 110 | 7186 | static int mpjpeg_read_probe(const AVProbeData *p) | |
| 111 | { | ||
| 112 | FFIOContext pb; | ||
| 113 | 7186 | int ret = 0; | |
| 114 | 7186 | int size = 0; | |
| 115 | |||
| 116 |
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7186 | if (p->buf_size < 2 || p->buf[0] != '-' || p->buf[1] != '-') |
| 117 | 7185 | return 0; | |
| 118 | |||
| 119 | 1 | ffio_init_read_context(&pb, p->buf, p->buf_size); | |
| 120 | |||
| 121 |
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1 | ret = (parse_multipart_header(&pb.pub, &size, "--", NULL) >= 0) ? AVPROBE_SCORE_MAX : 0; |
| 122 | |||
| 123 | 1 | return ret; | |
| 124 | } | ||
| 125 | |||
| 126 | ✗ | static int mpjpeg_read_header(AVFormatContext *s) | |
| 127 | { | ||
| 128 | AVStream *st; | ||
| 129 | ✗ | char boundary[70 + 2 + 1] = {0}; | |
| 130 | ✗ | int64_t pos = avio_tell(s->pb); | |
| 131 | int ret; | ||
| 132 | |||
| 133 | do { | ||
| 134 | ✗ | ret = get_line(s->pb, boundary, sizeof(boundary)); | |
| 135 | ✗ | if (ret < 0) | |
| 136 | ✗ | return ret; | |
| 137 | ✗ | } while (!boundary[0]); | |
| 138 | |||
| 139 | ✗ | if (strncmp(boundary, "--", 2)) | |
| 140 | ✗ | return AVERROR_INVALIDDATA; | |
| 141 | |||
| 142 | ✗ | st = avformat_new_stream(s, NULL); | |
| 143 | ✗ | if (!st) | |
| 144 | ✗ | return AVERROR(ENOMEM); | |
| 145 | |||
| 146 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 147 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_MJPEG; | |
| 148 | |||
| 149 | ✗ | avpriv_set_pts_info(st, 60, 1, 25); | |
| 150 | |||
| 151 | ✗ | avio_seek(s->pb, pos, SEEK_SET); | |
| 152 | |||
| 153 | ✗ | return 0; | |
| 154 | } | ||
| 155 | |||
| 156 | ✗ | static int parse_content_length(const char *value) | |
| 157 | { | ||
| 158 | ✗ | long int val = strtol(value, NULL, 10); | |
| 159 | |||
| 160 | ✗ | if (val == LONG_MIN || val == LONG_MAX) | |
| 161 | ✗ | return AVERROR(errno); | |
| 162 | ✗ | if (val > INT_MAX) | |
| 163 | ✗ | return AVERROR(ERANGE); | |
| 164 | ✗ | return val; | |
| 165 | } | ||
| 166 | |||
| 167 | 1 | static int parse_multipart_header(AVIOContext *pb, | |
| 168 | int* size, | ||
| 169 | const char* expected_boundary, | ||
| 170 | void *log_ctx) | ||
| 171 | { | ||
| 172 | char line[128]; | ||
| 173 | 1 | int found_content_type = 0; | |
| 174 | int ret; | ||
| 175 | |||
| 176 | 1 | *size = -1; | |
| 177 | |||
| 178 | // get the CRLF as empty string | ||
| 179 | 1 | ret = get_line(pb, line, sizeof(line)); | |
| 180 |
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1 | if (ret < 0) |
| 181 | ✗ | return ret; | |
| 182 | |||
| 183 | /* some implementation do not provide the required | ||
| 184 | * initial CRLF (see rfc1341 7.2.1) | ||
| 185 | */ | ||
| 186 |
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1 | while (!line[0]) { |
| 187 | ✗ | ret = get_line(pb, line, sizeof(line)); | |
| 188 | ✗ | if (ret < 0) | |
| 189 | ✗ | return ret; | |
| 190 | } | ||
| 191 | |||
| 192 |
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1 | if (!av_strstart(line, expected_boundary, NULL)) { |
| 193 | ✗ | if (log_ctx) | |
| 194 | ✗ | av_log(log_ctx, | |
| 195 | AV_LOG_ERROR, | ||
| 196 | "Expected boundary '%s' not found, instead found a line of %"SIZE_SPECIFIER" bytes\n", | ||
| 197 | expected_boundary, | ||
| 198 | strlen(line)); | ||
| 199 | |||
| 200 | ✗ | return AVERROR_INVALIDDATA; | |
| 201 | } | ||
| 202 | |||
| 203 |
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1 | while (!pb->eof_reached) { |
| 204 | char *tag, *value; | ||
| 205 | |||
| 206 | 1 | ret = get_line(pb, line, sizeof(line)); | |
| 207 |
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1 | if (ret < 0) { |
| 208 | ✗ | if (ret == AVERROR_EOF) | |
| 209 | 1 | break; | |
| 210 | ✗ | return ret; | |
| 211 | } | ||
| 212 | |||
| 213 |
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1 | if (line[0] == '\0') |
| 214 | 1 | break; | |
| 215 | |||
| 216 | ✗ | ret = split_tag_value(&tag, &value, line); | |
| 217 | ✗ | if (ret < 0) | |
| 218 | ✗ | return ret; | |
| 219 | ✗ | if (value==NULL || tag==NULL) | |
| 220 | break; | ||
| 221 | |||
| 222 | ✗ | if (!av_strcasecmp(tag, "Content-type")) { | |
| 223 | ✗ | if (av_strcasecmp(value, "image/jpeg")) { | |
| 224 | ✗ | if (log_ctx) | |
| 225 | ✗ | av_log(log_ctx, AV_LOG_ERROR, | |
| 226 | "Unexpected %s : %s\n", | ||
| 227 | tag, value); | ||
| 228 | ✗ | return AVERROR_INVALIDDATA; | |
| 229 | } else | ||
| 230 | ✗ | found_content_type = 1; | |
| 231 | ✗ | } else if (!av_strcasecmp(tag, "Content-Length")) { | |
| 232 | ✗ | *size = parse_content_length(value); | |
| 233 | ✗ | if ( *size < 0 ) | |
| 234 | ✗ | if (log_ctx) | |
| 235 | ✗ | av_log(log_ctx, AV_LOG_WARNING, | |
| 236 | "Invalid Content-Length value : %s\n", | ||
| 237 | value); | ||
| 238 | } | ||
| 239 | } | ||
| 240 | |||
| 241 |
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1 | return found_content_type ? 0 : AVERROR_INVALIDDATA; |
| 242 | } | ||
| 243 | |||
| 244 | ✗ | static char* mpjpeg_get_boundary(AVIOContext* pb) | |
| 245 | { | ||
| 246 | ✗ | uint8_t *mime_type = NULL; | |
| 247 | const char *start; | ||
| 248 | const char *end; | ||
| 249 | ✗ | uint8_t *res = NULL; | |
| 250 | int len; | ||
| 251 | |||
| 252 | /* get MIME type, and skip to the first parameter */ | ||
| 253 | ✗ | av_opt_get(pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type); | |
| 254 | ✗ | start = mime_type; | |
| 255 | ✗ | while (start != NULL && *start != '\0') { | |
| 256 | ✗ | start = strchr(start, ';'); | |
| 257 | ✗ | if (!start) | |
| 258 | ✗ | break; | |
| 259 | |||
| 260 | ✗ | start = start+1; | |
| 261 | |||
| 262 | ✗ | while (av_isspace(*start)) | |
| 263 | ✗ | start++; | |
| 264 | |||
| 265 | ✗ | if (av_stristart(start, "boundary=", &start)) { | |
| 266 | ✗ | end = strchr(start, ';'); | |
| 267 | ✗ | if (end) | |
| 268 | ✗ | len = end - start - 1; | |
| 269 | else | ||
| 270 | ✗ | len = strlen(start); | |
| 271 | |||
| 272 | /* some endpoints may enclose the boundary | ||
| 273 | in Content-Type in quotes */ | ||
| 274 | ✗ | if ( len>2 && *start == '"' && start[len-1] == '"' ) { | |
| 275 | ✗ | start++; | |
| 276 | ✗ | len -= 2; | |
| 277 | } | ||
| 278 | ✗ | res = av_strndup(start, len); | |
| 279 | ✗ | break; | |
| 280 | } | ||
| 281 | } | ||
| 282 | |||
| 283 | ✗ | av_freep(&mime_type); | |
| 284 | ✗ | return res; | |
| 285 | } | ||
| 286 | |||
| 287 | ✗ | static int mpjpeg_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 288 | { | ||
| 289 | int size; | ||
| 290 | int ret; | ||
| 291 | |||
| 292 | ✗ | MPJPEGDemuxContext *mpjpeg = s->priv_data; | |
| 293 | ✗ | if (mpjpeg->boundary == NULL) { | |
| 294 | ✗ | uint8_t* boundary = NULL; | |
| 295 | ✗ | if (mpjpeg->strict_mime_boundary) { | |
| 296 | ✗ | boundary = mpjpeg_get_boundary(s->pb); | |
| 297 | } | ||
| 298 | ✗ | if (boundary != NULL) { | |
| 299 | ✗ | mpjpeg->boundary = av_asprintf("--%s", boundary); | |
| 300 | ✗ | mpjpeg->searchstr = av_asprintf("\r\n--%s\r\n", boundary); | |
| 301 | ✗ | av_freep(&boundary); | |
| 302 | } else { | ||
| 303 | ✗ | mpjpeg->boundary = av_strdup("--"); | |
| 304 | ✗ | mpjpeg->searchstr = av_strdup("\r\n--"); | |
| 305 | } | ||
| 306 | ✗ | if (!mpjpeg->boundary || !mpjpeg->searchstr) { | |
| 307 | ✗ | av_freep(&mpjpeg->boundary); | |
| 308 | ✗ | av_freep(&mpjpeg->searchstr); | |
| 309 | ✗ | return AVERROR(ENOMEM); | |
| 310 | } | ||
| 311 | ✗ | mpjpeg->searchstr_len = strlen(mpjpeg->searchstr); | |
| 312 | } | ||
| 313 | |||
| 314 | ✗ | ret = parse_multipart_header(s->pb, &size, mpjpeg->boundary, s); | |
| 315 | ✗ | if (ret < 0) | |
| 316 | ✗ | return ret; | |
| 317 | |||
| 318 | ✗ | if (size > 0) { | |
| 319 | /* size has been provided to us in MIME header */ | ||
| 320 | ✗ | ret = av_get_packet(s->pb, pkt, size); | |
| 321 | } else { | ||
| 322 | /* no size was given -- we read until the next boundary or end-of-file */ | ||
| 323 | int len; | ||
| 324 | |||
| 325 | ✗ | const int read_chunk = 2048; | |
| 326 | |||
| 327 | ✗ | pkt->pos = avio_tell(s->pb); | |
| 328 | |||
| 329 | ✗ | while ((ret = ffio_ensure_seekback(s->pb, read_chunk)) >= 0 && /* we may need to return as much as all we've read back to the buffer */ | |
| 330 | ✗ | (ret = av_append_packet(s->pb, pkt, read_chunk)) >= 0) { | |
| 331 | /* scan the new data */ | ||
| 332 | char *start; | ||
| 333 | |||
| 334 | ✗ | len = ret; | |
| 335 | ✗ | start = pkt->data + pkt->size - len; | |
| 336 | do { | ||
| 337 | ✗ | if (!memcmp(start, mpjpeg->searchstr, mpjpeg->searchstr_len)) { | |
| 338 | // got the boundary! rewind the stream | ||
| 339 | ✗ | avio_seek(s->pb, -len, SEEK_CUR); | |
| 340 | ✗ | pkt->size -= len; | |
| 341 | ✗ | return pkt->size; | |
| 342 | } | ||
| 343 | ✗ | len--; | |
| 344 | ✗ | start++; | |
| 345 | ✗ | } while (len >= mpjpeg->searchstr_len); | |
| 346 | ✗ | avio_seek(s->pb, -len, SEEK_CUR); | |
| 347 | ✗ | pkt->size -= len; | |
| 348 | } | ||
| 349 | |||
| 350 | /* error or EOF occurred */ | ||
| 351 | ✗ | if (ret == AVERROR_EOF) { | |
| 352 | ✗ | ret = pkt->size > 0 ? pkt->size : AVERROR_EOF; | |
| 353 | } | ||
| 354 | } | ||
| 355 | |||
| 356 | ✗ | return ret; | |
| 357 | } | ||
| 358 | |||
| 359 | #define OFFSET(x) offsetof(MPJPEGDemuxContext, x) | ||
| 360 | #define DEC AV_OPT_FLAG_DECODING_PARAM | ||
| 361 | static const AVOption mpjpeg_options[] = { | ||
| 362 | { "strict_mime_boundary", "require MIME boundaries match", OFFSET(strict_mime_boundary), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC }, | ||
| 363 | { NULL } | ||
| 364 | }; | ||
| 365 | |||
| 366 | static const AVClass mpjpeg_demuxer_class = { | ||
| 367 | .class_name = "MPJPEG demuxer", | ||
| 368 | .item_name = av_default_item_name, | ||
| 369 | .option = mpjpeg_options, | ||
| 370 | .version = LIBAVUTIL_VERSION_INT, | ||
| 371 | }; | ||
| 372 | |||
| 373 | const FFInputFormat ff_mpjpeg_demuxer = { | ||
| 374 | .p.name = "mpjpeg", | ||
| 375 | .p.long_name = NULL_IF_CONFIG_SMALL("MIME multipart JPEG"), | ||
| 376 | .p.mime_type = "multipart/x-mixed-replace", | ||
| 377 | .p.extensions = "mjpg", | ||
| 378 | .p.priv_class = &mpjpeg_demuxer_class, | ||
| 379 | .p.flags = AVFMT_NOTIMESTAMPS, | ||
| 380 | .priv_data_size = sizeof(MPJPEGDemuxContext), | ||
| 381 | .read_probe = mpjpeg_read_probe, | ||
| 382 | .read_header = mpjpeg_read_header, | ||
| 383 | .read_packet = mpjpeg_read_packet, | ||
| 384 | .read_close = mpjpeg_read_close, | ||
| 385 | }; | ||
| 386 |