1 files changed, 123 insertions, 0 deletions

diff --git a/src/plugins/riff_extractor.c b/src/plugins/riff_extractor.c
new file mode 100644
index 0000000..f6cd7f6
--- /dev/null
+++ b/src/plugins/riff_extractor.c
@@ -0,0 +1,123 @@
+/*
+     This file is part of libextractor.
+     (C) 2004, 2009 Vidyut Samanta and Christian Grothoff
+
+     libextractor 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, or (at your
+     option) any later version.
+
+     libextractor 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 libextractor; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+
+     This code was based on AVInfo 1.0 alpha 11
+     (c) George Shuklin, gs]AT[shounen.ru, 2002-2004
+     http://shounen.ru/soft/avinfo/
+
+     and bitcollider 0.6.0
+     (PD) 2004 The Bitzi Corporation
+     http://bitzi.com/
+ */
+
+#include "platform.h"
+#include "extractor.h"
+#include <math.h>
+
+/**
+ * Read the specified number of bytes as a little-endian (least
+ * significant byte first) integer.
+ */
+static unsigned int
+fread_le (const char *data)
+{
+  int x;
+  unsigned int result = 0;
+
+  for (x = 0; x < 4; x++)
+    result |= ((unsigned char) data[x]) << (x * 8);
+  return result;
+}
+
+/* We implement our own rounding function, because the availability of
+ * C99's round(), nearbyint(), rint(), etc. seems to be spotty, whereas
+ * floor() is available in math.h on all C compilers.
+ */
+static double
+round_double (double num)
+{
+  return floor (num + 0.5);
+}
+
+#define ADD(s,t) do { if (0 != (ret = proc (proc_cls, "riff", t, EXTRACTOR_METAFORMAT_UTF8, "text/plain", s, strlen(s)+1))) goto FINISH; } while (0)
+
+/* video/x-msvideo */
+int 
+EXTRACTOR_riff_extract (const char *xdata,
+                        size_t xsize,
+                        EXTRACTOR_MetaDataProcessor proc,
+                        void *proc_cls,
+                        const char *options)
+{
+  unsigned int blockLen;
+  unsigned int fps;
+  unsigned int duration;
+  size_t pos;
+  unsigned int width;
+  unsigned int height;
+  char codec[5];
+  char format[256];
+  int ret;
+
+  if (xsize < 32)
+    return 0;
+  if ((memcmp (&xdata[0],
+               "RIFF", 4) != 0) || (memcmp (&xdata[8], "AVI ", 4) != 0))
+    return 0;
+  if (memcmp (&xdata[12], "LIST", 4) != 0)
+    return 0;
+  if (memcmp (&xdata[20], "hdrlavih", 8) != 0)
+    return 0;
+
+  blockLen = fread_le (&xdata[28]);
+
+  /* begin of AVI header at 32 */
+  fps = (unsigned int) round_double ((double) 1.0e6 / fread_le (&xdata[32]));
+  duration = (unsigned int) round_double ((double) fread_le (&xdata[48])
+                                          * 1000 / fps);
+  width = fread_le (&xdata[64]);
+  height = fread_le (&xdata[68]);
+  /* pos: begin of video stream header */
+  pos = blockLen + 32;
+
+  if ((pos < blockLen) || (pos + 32 > xsize) || (pos > xsize))
+    return 0;
+  if (memcmp (&xdata[pos], "LIST", 4) != 0)
+    return 0;
+  blockLen = fread_le (&xdata[pos + 4]);
+  if (memcmp (&xdata[pos + 8], "strlstrh", 8) != 0)
+    return 0;
+  if (memcmp (&xdata[pos + 20], "vids", 4) != 0)
+    return 0;
+  ret = 0;
+  /* pos + 24: video stream header */
+  memcpy (codec, &xdata[pos + 24], 4);
+  codec[4] = '\0';
+  snprintf (format,
+            sizeof(format),
+            _("codec: %s, %u fps, %u ms"), codec, fps, duration);
+  ADD (format, EXTRACTOR_METATYPE_FORMAT);
+  snprintf (format, 
+            sizeof(format), 
+            "%ux%u", width, height);
+  ADD (format, EXTRACTOR_METATYPE_IMAGE_DIMENSIONS);
+  ADD ("video/x-msvideo", EXTRACTOR_METATYPE_MIMETYPE);
+ FINISH:
+  return ret;
+}