#include <vlc_plugin.h>
#include <vlc_demux.h>
#include <vlc_image.h>
+#include "mxpeg_helper.h"
/*****************************************************************************
* Module descriptor
{ .codec = VLC_CODEC_PNM,
.detect = IsPnm,
},
+ { .codec = VLC_CODEC_MXPEG,
+ .detect = IsMxpeg,
+ },
{ .codec = VLC_CODEC_JPEG,
.detect = IsJfif,
},
msg_Dbg(demux, "Detected image: %s",
vlc_fourcc_GetDescription(VIDEO_ES, img->codec));
+ if( img->codec == VLC_CODEC_MXPEG )
+ {
+ return VLC_EGENERIC; //let avformat demux this file
+ }
+
/* Load and if selected decode */
es_format_t fmt;
es_format_Init(&fmt, VIDEO_ES, img->codec);
--- /dev/null
+/*****************************************************************************
+ * mxpeg_helper.h: MXPEG helper functions
+ *****************************************************************************
+ * Copyright (C) 2012 the VideoLAN team
+ * $Id$
+ *
+ * Authors: Sébastien Escudier
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+/**
+ * Finds FF XX in the first size byte of data
+ */
+static uint8_t find_jpeg_marker(int *position, const uint8_t *data, int size)
+{
+ for (int i = *position; i + 1 < size; i++) {
+ if (data[i] != 0xff)
+ continue;
+ if (data[i + 1] != 0xff) {
+ *position = i + 2;
+ return data[i + 1];
+ }
+ }
+ return 0xff;
+}
+
+/*
+ * Mxpeg frame format : http://developer.mobotix.com/docs/mxpeg_frame.html
+ * */
+static bool IsMxpeg(stream_t *s)
+{
+ const uint8_t *header;
+ int size = stream_Peek(s, &header, 256);
+ int position = 0;
+
+ if (find_jpeg_marker(&position, header, size) != 0xd8)
+ return false;
+ if (find_jpeg_marker(&position, header, position + 2) != 0xe0)
+ return false;
+
+ if (position + 2 > size)
+ return false;
+
+ /* Skip this jpeg header */
+ uint32_t header_size = GetWBE(&header[position]);
+ position += header_size;
+ if (position + 4 > size)
+ {
+ size = position + 4;
+ if( stream_Peek (s, &header, size) < size )
+ return false;
+ }
+
+ /* Skip the comment header */
+ if ( !(header[position] == 0xFF && header[position+1] == 0xFE) )
+ return false;
+
+ position += 2;
+ header_size = GetWBE (&header[position]);
+
+ /* Find the MXF header */
+ size = position + header_size + 8; //8 = FF FE 00 00 M X F 00
+ if (stream_Peek(s, &header, position + header_size + 8 ) < size)
+ return false;
+
+ position += header_size;
+ if ( !(header[position] == 0xFF && header[position+1] == 0xFE) )
+ return false;
+
+ position += 4;
+
+ if (memcmp (&header[position], "MXF\0", 4) )
+ return false;
+
+ return true;
+}