modules/demux/image.c

   1 /*****************************************************************************
   2  * image.c: Image demuxer
   3  *****************************************************************************
   4  * Copyright (C) 2010 Laurent Aimar
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program 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
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_demux.h>
  35 #include <vlc_image.h>
  36 #include "mxpeg_helper.h"
  37
  38 /*****************************************************************************
  39  * Module descriptor
  40  *****************************************************************************/
  41 static int  Open (vlc_object_t *);
  42 static void Close(vlc_object_t *);
  43
  44 #define ID_TEXT N_("ES ID")
  45 #define ID_LONGTEXT N_( \
  46     "Set the ID of the elementary stream")
  47
  48 #define GROUP_TEXT N_("Group")
  49 #define GROUP_LONGTEXT N_(\
  50     "Set the group of the elementary stream")
  51
  52 #define DECODE_TEXT N_("Decode")
  53 #define DECODE_LONGTEXT N_( \
  54     "Decode at the demuxer stage")
  55
  56 #define CHROMA_TEXT N_("Forced chroma")
  57 #define CHROMA_LONGTEXT N_( \
  58     "If non empty and image-decode is true, the image will be " \
  59     "converted to the specified chroma.")
  60
  61 #define DURATION_TEXT N_("Duration in seconds")
  62 #define DURATION_LONGTEXT N_( \
  63     "Duration in seconds before simulating an end of file. " \
  64     "A negative value means an unlimited play time.")
  65
  66 #define FPS_TEXT N_("Frame rate")
  67 #define FPS_LONGTEXT N_( \
  68     "Frame rate of the elementary stream produced.")
  69
  70 #define RT_TEXT N_("Real-time")
  71 #define RT_LONGTEXT N_( \
  72     "Use real-time mode suitable for being used as a master input and " \
  73     "real-time input slaves.")
  74
  75 vlc_module_begin()
  76     set_description(N_("Image demuxer"))
  77     set_shortname(N_("Image"))
  78     set_category(CAT_INPUT)
  79     set_subcategory(SUBCAT_INPUT_DEMUX)
  80     add_integer("image-id", -1, ID_TEXT, ID_LONGTEXT, true)
  81         change_safe()
  82     add_integer("image-group", 0, GROUP_TEXT, GROUP_LONGTEXT, true)
  83         change_safe()
  84     add_bool("image-decode", true, DECODE_TEXT, DECODE_LONGTEXT, true)
  85         change_safe()
  86     add_string("image-chroma", "", CHROMA_TEXT, CHROMA_LONGTEXT, true)
  87         change_safe()
  88     add_float("image-duration", 10, DURATION_TEXT, DURATION_LONGTEXT, false)
  89         change_safe()
  90     add_string("image-fps", "10/1", FPS_TEXT, FPS_LONGTEXT, true)
  91         change_safe()
  92     add_bool("image-realtime", false, RT_TEXT, RT_LONGTEXT, true)
  93         change_safe()
  94     set_capability("demux", 10)
  95     set_callbacks(Open, Close)
  96 vlc_module_end()
  97
  98 /*****************************************************************************
  99  * Local prototypes
 100  *****************************************************************************/
 101 typedef struct
 102 {
 103     block_t     *data;
 104     es_out_id_t *es;
 105     vlc_tick_t  duration;
 106     bool        is_realtime;
 107     int64_t     pts_offset;
 108     vlc_tick_t  pts_next;
 109     date_t        pts;
 110 } demux_sys_t;
 111
 112 static block_t *Load(demux_t *demux)
 113 {
 114     const unsigned max_size = 4096 * 4096 * 8;
 115     uint64_t size;
 116
 117     if (vlc_stream_GetSize(demux->s, &size) == VLC_SUCCESS) {
 118         if (size > max_size) {
 119             msg_Err(demux, "image too large (%"PRIu64" > %u), rejected",
 120                     size, max_size);
 121             return NULL;
 122         }
 123     } else
 124         size = max_size;
 125
 126     block_t *block = block_Alloc(size);
 127     if (block == NULL)
 128         return NULL;
 129
 130     ssize_t val = vlc_stream_Read(demux->s, block->p_buffer, size);
 131     if (val < 0) {
 132         block_Release(block);
 133         return NULL;
 134     }
 135
 136     block->i_buffer = val;
 137     return block;
 138 }
 139
 140 static block_t *Decode(demux_t *demux,
 141                        video_format_t *fmt, vlc_fourcc_t chroma, block_t *data)
 142 {
 143     image_handler_t *handler = image_HandlerCreate(demux);
 144     if (!handler) {
 145         block_Release(data);
 146         return NULL;
 147     }
 148
 149     video_format_t decoded;
 150     video_format_Init(&decoded, chroma);
 151
 152     picture_t *image = image_Read(handler, data, fmt, &decoded);
 153     image_HandlerDelete(handler);
 154
 155     if (!image)
 156         return NULL;
 157
 158     video_format_Clean(fmt);
 159     *fmt = decoded;
 160
 161     size_t size = 0;
 162     for (int i = 0; i < image->i_planes; i++)
 163         size += image->p[i].i_pitch * image->p[i].i_lines;
 164
 165     data = block_Alloc(size);
 166     if (!data) {
 167         picture_Release(image);
 168         return NULL;
 169     }
 170
 171     size_t offset = 0;
 172     for (int i = 0; i < image->i_planes; i++) {
 173         const plane_t *src = &image->p[i];
 174         for (int y = 0; y < src->i_visible_lines; y++) {
 175             memcpy(&data->p_buffer[offset],
 176                    &src->p_pixels[y * src->i_pitch],
 177                    src->i_visible_pitch);
 178             offset += src->i_visible_pitch;
 179         }
 180     }
 181
 182     picture_Release(image);
 183     return data;
 184 }
 185
 186 static int Demux(demux_t *demux)
 187 {
 188     demux_sys_t *sys = demux->p_sys;
 189
 190     if (!sys->data)
 191         return VLC_DEMUXER_EOF;
 192
 193     vlc_tick_t deadline;
 194     const vlc_tick_t pts_first = sys->pts_offset + date_Get(&sys->pts);
 195     if (sys->pts_next != VLC_TICK_INVALID) {
 196         deadline = sys->pts_next;
 197     } else if (sys->is_realtime) {
 198         deadline = vlc_tick_now();
 199         const vlc_tick_t max_wait = VLC_TICK_FROM_MS(20);
 200         if (deadline + max_wait < pts_first) {
 201             es_out_SetPCR(demux->out, deadline);
 202             /* That's ugly, but not yet easily fixable */
 203             vlc_tick_wait(deadline + max_wait);
 204             return VLC_DEMUXER_SUCCESS;
 205         }
 206     } else {
 207         deadline = 1 + pts_first;
 208     }
 209
 210     for (;;) {
 211         const vlc_tick_t pts = sys->pts_offset + date_Get(&sys->pts);
 212         if (sys->duration >= 0 && pts >= VLC_TICK_0 + sys->pts_offset + sys->duration)
 213             return VLC_DEMUXER_EOF;
 214
 215         if (pts >= deadline)
 216             return VLC_DEMUXER_SUCCESS;
 217
 218         block_t *data = block_Duplicate(sys->data);
 219         if (!data)
 220             return VLC_DEMUXER_EGENERIC;
 221
 222         data->i_dts =
 223         data->i_pts = VLC_TICK_0 + pts;
 224         es_out_SetPCR(demux->out, data->i_pts);
 225         if(sys->es)
 226             es_out_Send(demux->out, sys->es, data);
 227         else
 228             block_Release(data);
 229
 230         date_Increment(&sys->pts, 1);
 231     }
 232 }
 233
 234 static int Control(demux_t *demux, int query, va_list args)
 235 {
 236     demux_sys_t *sys = demux->p_sys;
 237
 238     switch (query) {
 239     case DEMUX_CAN_SEEK:
 240         *va_arg(args, bool *) = sys->duration >= 0 && !sys->is_realtime;
 241         return VLC_SUCCESS;
 242     case DEMUX_GET_POSITION: {
 243         double *position = va_arg(args, double *);
 244         if (sys->duration > 0)
 245             *position = date_Get(&sys->pts) / (double)sys->duration;
 246         else
 247             *position = 0;
 248         return VLC_SUCCESS;
 249     }
 250     case DEMUX_SET_POSITION: {
 251         if (sys->duration < 0 || sys->is_realtime)
 252             return VLC_EGENERIC;
 253         double position = va_arg(args, double);
 254         date_Set(&sys->pts, position * sys->duration);
 255         return VLC_SUCCESS;
 256     }
 257     case DEMUX_GET_TIME: {
 258         int64_t *time = va_arg(args, int64_t *);
 259         *time = sys->pts_offset + date_Get(&sys->pts);
 260         return VLC_SUCCESS;
 261     }
 262     case DEMUX_SET_TIME: {
 263         if (sys->duration < 0 || sys->is_realtime)
 264             return VLC_EGENERIC;
 265         int64_t time = va_arg(args, int64_t);
 266         date_Set(&sys->pts, VLC_CLIP(time - sys->pts_offset, VLC_TICK_0, sys->duration));
 267         return VLC_SUCCESS;
 268     }
 269     case DEMUX_SET_NEXT_DEMUX_TIME: {
 270         vlc_tick_t pts_next = VLC_TICK_0 + va_arg(args, vlc_tick_t);
 271         if (sys->pts_next == VLC_TICK_INVALID)
 272             sys->pts_offset = pts_next - VLC_TICK_0;
 273         sys->pts_next = pts_next;
 274         return VLC_SUCCESS;
 275     }
 276     case DEMUX_GET_LENGTH: {
 277         int64_t *length = va_arg(args, int64_t *);
 278         *length = __MAX(sys->duration, 0);
 279         return VLC_SUCCESS;
 280     }
 281     case DEMUX_GET_FPS: {
 282         double *fps = va_arg(args, double *);
 283         *fps = (double)sys->pts.i_divider_num / sys->pts.i_divider_den;
 284         return VLC_SUCCESS;
 285     }
 286     case DEMUX_GET_META:
 287     case DEMUX_HAS_UNSUPPORTED_META:
 288     case DEMUX_GET_ATTACHMENTS:
 289         return VLC_EGENERIC;
 290
 291     case DEMUX_CAN_PAUSE:
 292     case DEMUX_SET_PAUSE_STATE:
 293     case DEMUX_CAN_CONTROL_PACE:
 294     case DEMUX_GET_PTS_DELAY:
 295         return demux_vaControlHelper( demux->s, 0, -1, 0, 1, query, args );
 296
 297     default:
 298         return VLC_EGENERIC;
 299
 300     }
 301 }
 302
 303 static bool IsBmp(stream_t *s)
 304 {
 305     const uint8_t *header;
 306     if (vlc_stream_Peek(s, &header, 18) < 18)
 307         return false;
 308     if (memcmp(header, "BM", 2) &&
 309         memcmp(header, "BA", 2) &&
 310         memcmp(header, "CI", 2) &&
 311         memcmp(header, "CP", 2) &&
 312         memcmp(header, "IC", 2) &&
 313         memcmp(header, "PT", 2))
 314         return false;
 315     uint32_t file_size   = GetDWLE(&header[2]);
 316     uint32_t data_offset = GetDWLE(&header[10]);
 317     uint32_t header_size = GetDWLE(&header[14]);
 318     if (file_size != 14 && file_size != 14 + header_size &&
 319         file_size <= data_offset)
 320         return false;
 321     if (data_offset < header_size + 14)
 322         return false;
 323     if (header_size != 12 && header_size < 40)
 324         return false;
 325     return true;
 326 }
 327
 328 static bool IsPcx(stream_t *s)
 329 {
 330     const uint8_t *header;
 331     if (vlc_stream_Peek(s, &header, 66) < 66)
 332         return false;
 333     if (header[0] != 0x0A ||                        /* marker */
 334         (header[1] != 0x00 && header[1] != 0x02 &&
 335          header[1] != 0x03 && header[1] != 0x05) || /* version */
 336         (header[2] != 0 && header[2] != 1) ||       /* encoding */
 337         (header[3] != 1 && header[3] != 2 &&
 338          header[3] != 4 && header[3] != 8) ||       /* bits per pixel per plane */
 339         header[64] != 0 ||                          /* reserved */
 340         header[65] == 0 || header[65] > 4)          /* plane count */
 341         return false;
 342     if (GetWLE(&header[4]) > GetWLE(&header[8]) ||  /* xmin vs xmax */
 343         GetWLE(&header[6]) > GetWLE(&header[10]))   /* ymin vs ymax */
 344         return false;
 345     return true;
 346 }
 347
 348 static bool IsLbm(stream_t *s)
 349 {
 350     const uint8_t *header;
 351     if (vlc_stream_Peek(s, &header, 12) < 12)
 352         return false;
 353     if (memcmp(&header[0], "FORM", 4) ||
 354         GetDWBE(&header[4]) <= 4 ||
 355         (memcmp(&header[8], "ILBM", 4) && memcmp(&header[8], "PBM ", 4)))
 356         return false;
 357     return true;
 358 }
 359 static bool IsPnmBlank(uint8_t v)
 360 {
 361     return v == ' ' || v == '\t' || v == '\r' || v == '\n';
 362 }
 363 static bool IsPnm(stream_t *s)
 364 {
 365     const uint8_t *header;
 366     int size = vlc_stream_Peek(s, &header, 256);
 367     if (size < 3)
 368         return false;
 369     if (header[0] != 'P' ||
 370         header[1] < '1' || header[1] > '6' ||
 371         !IsPnmBlank(header[2]))
 372         return false;
 373
 374     int number_count = 0;
 375     for (int i = 3, parsing_number = 0; i < size && number_count < 2; i++) {
 376         if (IsPnmBlank(header[i])) {
 377             if (parsing_number) {
 378                 parsing_number = 0;
 379                 number_count++;
 380             }
 381         } else {
 382             if (header[i] < '0' || header[i] > '9')
 383                 break;
 384             parsing_number = 1;
 385         }
 386     }
 387     if (number_count < 2)
 388         return false;
 389     return true;
 390 }
 391
 392 static uint8_t FindJpegMarker(int *position, const uint8_t *data, int size)
 393 {
 394     for (int i = *position; i + 1 < size; i++) {
 395         if (data[i + 0] != 0xff || data[i + 1] == 0x00)
 396             return 0xff;
 397         if (data[i + 1] != 0xff) {
 398             *position = i + 2;
 399             return data[i + 1];
 400         }
 401     }
 402     return 0xff;
 403 }
 404 static bool IsJfif(stream_t *s)
 405 {
 406     const uint8_t *header;
 407     int size = vlc_stream_Peek(s, &header, 256);
 408     int position = 0;
 409
 410     if (FindJpegMarker(&position, header, size) != 0xd8)
 411         return false;
 412     if (FindJpegMarker(&position, header, size) != 0xe0)
 413         return false;
 414     position += 2;  /* Skip size */
 415     if (position + 5 > size)
 416         return false;
 417     if (memcmp(&header[position], "JFIF\0", 5))
 418         return false;
 419     return true;
 420 }
 421
 422 static bool IsWebP(stream_t *s)
 423 {
 424     const uint8_t *header;
 425     if (vlc_stream_Peek(s, &header, 20) < 20) /* WebP header size */
 426         return false;
 427     if (memcmp(&header[0], "RIFF", 4))
 428         return false;
 429     /* TODO: support other chunk types */
 430     if (memcmp(&header[8], "WEBPVP8 ", 8))
 431         return false;
 432     /* skip headers */
 433     vlc_stream_Seek(s, 20);
 434     return true;
 435 }
 436
 437 static bool IsSpiff(stream_t *s)
 438 {
 439     const uint8_t *header;
 440     if (vlc_stream_Peek(s, &header, 36) < 36) /* SPIFF header size */
 441         return false;
 442     if (header[0] != 0xff || header[1] != 0xd8 ||
 443         header[2] != 0xff || header[3] != 0xe8)
 444         return false;
 445     if (memcmp(&header[6], "SPIFF\0", 6))
 446         return false;
 447     return true;
 448 }
 449
 450 static bool IsExif(stream_t *s)
 451 {
 452     const uint8_t *header;
 453     ssize_t size = vlc_stream_Peek(s, &header, 256);
 454     if (size == -1)
 455         return false;
 456     int position = 0;
 457
 458     if (FindJpegMarker(&position, header, size) != 0xd8)
 459         return false;
 460     if (FindJpegMarker(&position, header, size) != 0xe1)
 461         return false;
 462     position += 2;  /* Skip size */
 463     if (position + 5 > size)
 464         return false;
 465     if (memcmp(&header[position], "Exif\0", 5))
 466         return false;
 467     return true;
 468 }
 469
 470 static bool FindSVGmarker(int *position, const uint8_t *data, const int size, const char *marker)
 471 {
 472     for( int i = *position; i < size; i++)
 473     {
 474         if (memcmp(&data[i], marker, strlen(marker)) == 0)
 475         {
 476             *position = i;
 477             return true;
 478         }
 479     }
 480     return false;
 481 }
 482
 483 static bool IsSVG(stream_t *s)
 484 {
 485     if (s->psz_url == NULL)
 486         return false;
 487
 488     char *ext = strstr(s->psz_url, ".svg");
 489     if (!ext) return false;
 490
 491     const uint8_t *header;
 492     ssize_t size = vlc_stream_Peek(s, &header, 4096);
 493     if (size == -1)
 494         return false;
 495     int position = 0;
 496
 497     const char xml[] = "<?xml version=\"";
 498     if (!FindSVGmarker(&position, header, size, xml))
 499         return false;
 500     if (position != 0)
 501         return false;
 502
 503     const char endxml[] = ">\0";
 504     if (!FindSVGmarker(&position, header, size, endxml))
 505         return false;
 506     if (position <= 15)
 507         return false;
 508
 509     const char svg[] = "<svg";
 510     if (!FindSVGmarker(&position, header, size, svg))
 511         return false;
 512     if (position < 19)
 513         return false;
 514
 515     /* SVG Scalable Vector Graphics image */
 516
 517     /* NOTE: some SVG images have the mimetype set in a meta data section
 518      * and some do not */
 519     return true;
 520 }
 521
 522 static bool IsTarga(stream_t *s)
 523 {
 524     /* The header is not enough to ensure proper detection, we need
 525      * to have a look at the footer. But doing so can be slow. So
 526      * try to avoid it when possible */
 527     const uint8_t *header;
 528     if (vlc_stream_Peek(s, &header, 18) < 18)   /* Targa fixed header */
 529         return false;
 530     if (header[1] > 1)                      /* Color Map Type */
 531         return false;
 532     if ((header[1] != 0 || header[3 + 4] != 0) &&
 533         header[3 + 4] != 8  &&
 534         header[3 + 4] != 15 && header[3 + 4] != 16 &&
 535         header[3 + 4] != 24 && header[3 + 4] != 32)
 536         return false;
 537     if ((header[2] > 3 && header[2] < 9) || header[2] > 11) /* Image Type */
 538         return false;
 539     if (GetWLE(&header[8 + 4]) <= 0 ||      /* Width */
 540         GetWLE(&header[8 + 6]) <= 0)        /* Height */
 541         return false;
 542     if (header[8 + 8] != 8  &&
 543         header[8 + 8] != 15 && header[8 + 8] != 16 &&
 544         header[8 + 8] != 24 && header[8 + 8] != 32)
 545         return false;
 546     if (header[8 + 9] & 0xc0)               /* Reserved bits */
 547         return false;
 548
 549     const int64_t size = stream_Size(s);
 550     if (size <= 18 + 26)
 551         return false;
 552     bool can_seek;
 553     if (vlc_stream_Control(s, STREAM_CAN_SEEK, &can_seek) || !can_seek)
 554         return false;
 555
 556     const int64_t position = vlc_stream_Tell(s);
 557     if (vlc_stream_Seek(s, size - 26))
 558         return false;
 559
 560     const uint8_t *footer;
 561     bool is_targa = vlc_stream_Peek(s, &footer, 26) >= 26 &&
 562                     !memcmp(&footer[8], "TRUEVISION-XFILE.\x00", 18);
 563     vlc_stream_Seek(s, position);
 564     return is_targa;
 565 }
 566
 567 typedef struct {
 568     vlc_fourcc_t  codec;
 569     size_t        marker_size;
 570     const uint8_t marker[14];
 571     bool          (*detect)(stream_t *s);
 572 } image_format_t;
 573
 574 #define VLC_CODEC_XCF VLC_FOURCC('X', 'C', 'F', ' ')
 575 #define VLC_CODEC_LBM VLC_FOURCC('L', 'B', 'M', ' ')
 576 static const image_format_t formats[] = {
 577     { .codec = VLC_CODEC_XCF,
 578       .marker_size = 9 + 4 + 1,
 579       .marker = { 'g', 'i', 'm', 'p', ' ', 'x', 'c', 'f', ' ',
 580                   'f', 'i', 'l', 'e', '\0' }
 581     },
 582     { .codec = VLC_CODEC_XCF,
 583       .marker_size = 9 + 4 + 1,
 584       .marker = { 'g', 'i', 'm', 'p', ' ', 'x', 'c', 'f', ' ',
 585                   'v', '0', '0', '1', '\0' }
 586     },
 587     { .codec = VLC_CODEC_XCF,
 588       .marker_size = 9 + 4 + 1,
 589       .marker = { 'g', 'i', 'm', 'p', ' ', 'x', 'c', 'f', ' ',
 590                   'v', '0', '0', '2', '\0' }
 591     },
 592     { .codec = VLC_CODEC_PNG,
 593       .marker_size = 8,
 594       .marker = { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A }
 595     },
 596     { .codec = VLC_CODEC_GIF,
 597       .marker_size = 6,
 598       .marker = { 'G', 'I', 'F', '8', '7', 'a' }
 599     },
 600     { .codec = VLC_CODEC_GIF,
 601       .marker_size = 6,
 602       .marker = { 'G', 'I', 'F', '8', '9', 'a' }
 603     },
 604     /* XXX TIFF detection may be a bit weak */
 605     { .codec = VLC_CODEC_TIFF,
 606       .marker_size = 4,
 607       .marker = { 'I', 'I', 0x2a, 0x00 },
 608     },
 609     { .codec = VLC_CODEC_TIFF,
 610       .marker_size = 4,
 611       .marker = { 'M', 'M', 0x00, 0x2a },
 612     },
 613     { .codec = VLC_CODEC_BMP,
 614       .detect = IsBmp,
 615     },
 616     { .codec = VLC_CODEC_PCX,
 617       .detect = IsPcx,
 618     },
 619     { .codec = VLC_CODEC_LBM,
 620       .detect = IsLbm,
 621     },
 622     { .codec = VLC_CODEC_PNM,
 623       .detect = IsPnm,
 624     },
 625     { .codec = VLC_CODEC_MXPEG,
 626       .detect = IsMxpeg,
 627     },
 628     { .codec = VLC_CODEC_JPEG,
 629       .detect = IsJfif,
 630     },
 631     { .codec = VLC_CODEC_JPEG,
 632       .detect = IsSpiff,
 633     },
 634     { .codec = VLC_CODEC_JPEG,
 635       .detect = IsExif,
 636     },
 637     { .codec = VLC_CODEC_WEBP,
 638       .detect = IsWebP,
 639     },
 640     { .codec = VLC_CODEC_BPG,
 641       .marker_size = 4,
 642       .marker = { 'B', 'P', 'G', 0xFB },
 643     },
 644     { .codec = VLC_CODEC_SVG,
 645       .detect = IsSVG,
 646     },
 647     { .codec = VLC_CODEC_TARGA,
 648       .detect = IsTarga,
 649     },
 650     { .codec = 0 }
 651 };
 652
 653 static int Open(vlc_object_t *object)
 654 {
 655     demux_t *demux = (demux_t*)object;
 656
 657     /* Detect the image type */
 658     const image_format_t *img;
 659
 660     const uint8_t *peek;
 661     ssize_t peek_size = 0;
 662     for (int i = 0; ; i++) {
 663         img = &formats[i];
 664         if (!img->codec)
 665             return VLC_EGENERIC;
 666
 667         if (img->detect) {
 668             if (img->detect(demux->s))
 669                 break;
 670             /* detect callbacks can invalidate the current peek buffer */
 671             peek_size = 0;
 672         } else {
 673             if ((size_t) peek_size < img->marker_size)
 674             {
 675                 peek_size = vlc_stream_Peek(demux->s, &peek, img->marker_size);
 676                 if (peek_size == -1)
 677                     return VLC_ENOMEM;
 678             }
 679             if ((size_t) peek_size >= img->marker_size &&
 680                 !memcmp(peek, img->marker, img->marker_size))
 681                 break;
 682         }
 683     }
 684     msg_Dbg(demux, "Detected image: %s",
 685             vlc_fourcc_GetDescription(VIDEO_ES, img->codec));
 686
 687     if( img->codec == VLC_CODEC_MXPEG )
 688     {
 689         return VLC_EGENERIC; //let avformat demux this file
 690     }
 691
 692     /* Load and if selected decode */
 693     es_format_t fmt;
 694     es_format_Init(&fmt, VIDEO_ES, img->codec);
 695     fmt.video.i_chroma = fmt.i_codec;
 696
 697     block_t *data = Load(demux);
 698     if (data && var_InheritBool(demux, "image-decode")) {
 699         char *string = var_InheritString(demux, "image-chroma");
 700         vlc_fourcc_t chroma = vlc_fourcc_GetCodecFromString(VIDEO_ES, string);
 701         free(string);
 702
 703         data = Decode(demux, &fmt.video, chroma, data);
 704         fmt.i_codec = fmt.video.i_chroma;
 705     }
 706     fmt.i_id    = var_InheritInteger(demux, "image-id");
 707     fmt.i_group = var_InheritInteger(demux, "image-group");
 708     if (var_InheritURational(demux,
 709                              &fmt.video.i_frame_rate,
 710                              &fmt.video.i_frame_rate_base,
 711                              "image-fps") ||
 712         fmt.video.i_frame_rate <= 0 || fmt.video.i_frame_rate_base <= 0) {
 713         msg_Err(demux, "Invalid frame rate, using 10/1 instead");
 714         fmt.video.i_frame_rate      = 10;
 715         fmt.video.i_frame_rate_base = 1;
 716     }
 717
 718     /* If loadind failed, we still continue to avoid mis-detection
 719      * by other demuxers. */
 720     if (!data)
 721         msg_Err(demux, "Failed to load the image");
 722
 723     /* */
 724     demux_sys_t *sys = malloc(sizeof(*sys));
 725     if (!sys) {
 726         if (data)
 727             block_Release(data);
 728         es_format_Clean(&fmt);
 729         return VLC_ENOMEM;
 730     }
 731
 732     sys->data        = data;
 733     sys->es          = es_out_Add(demux->out, &fmt);
 734     sys->duration    = vlc_tick_from_sec( var_InheritFloat(demux, "image-duration") );
 735     sys->is_realtime = var_InheritBool(demux, "image-realtime");
 736     sys->pts_offset  = sys->is_realtime ? vlc_tick_now() : 0;
 737     sys->pts_next    = VLC_TICK_INVALID;
 738     date_Init(&sys->pts, fmt.video.i_frame_rate, fmt.video.i_frame_rate_base);
 739     date_Set(&sys->pts, VLC_TICK_0);
 740
 741     es_format_Clean(&fmt);
 742
 743     demux->pf_demux   = Demux;
 744     demux->pf_control = Control;
 745     demux->p_sys      = sys;
 746     return VLC_SUCCESS;
 747 }
 748
 749 static void Close(vlc_object_t *object)
 750 {
 751     demux_t     *demux = (demux_t*)object;
 752     demux_sys_t *sys   = demux->p_sys;
 753
 754     if (sys->data)
 755         block_Release(sys->data);
 756     free(sys);
 757 }
 758