Small fixes in get_range and better structure for generic muxer and demuxer.

Original commit message from CVS:
Small fixes in get_range and better structure for generic muxer and demuxer.

1 files changed, 223 insertions, 0 deletions

diff --git a/ext/metadata/metadata.c b/ext/metadata/metadata.c
new file mode 100644
index 00000000..7ae43fab
--- /dev/null
+++ b/ext/metadata/metadata.c
@@ -0,0 +1,223 @@
+/*
+ * GStreamer
+ * Copyright 2007 Edgard Lima <edgard.lima@indt.org.br>
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Alternatively, the contents of this file may be used under the
+ * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
+ * which case the following provisions apply instead of the ones
+ * mentioned above:
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <string.h>
+
+#include "metadata.h"
+
+/*
+ *static declarations
+ */
+
+static int
+metadata_parse_none (MetaData * meta_data, const guint8 * buf,
+    guint32 * bufsize, guint8 ** next_start, guint32 * next_size);
+
+/*
+ * extern implementation
+ */
+
+void
+metadata_init (MetaData * meta_data)
+{
+  meta_data->state = STATE_NULL;
+  meta_data->img_type = IMG_NONE;
+  meta_data->option = META_OPT_ALL;
+  meta_data->offset_orig = 0;
+  meta_data->exif_adapter = NULL;
+  meta_data->iptc_adapter = NULL;
+  meta_data->xmp_adapter = NULL;
+  metadata_chunk_array_init (&meta_data->strip_chunks, 4);
+  metadata_chunk_array_init (&meta_data->inject_chunks, 1);
+}
+
+/*
+ * offset: number of bytes to jump (just a hint to jump a chunk)
+ * size: number of bytes to read on next call (just a hint to get all chunk)
+ * return:
+ *   -1 -> error
+ *    0 -> done
+ *    1 -> need more data
+ */
+int
+metadata_parse (MetaData * meta_data, const guint8 * buf,
+    guint32 bufsize, guint32 * next_offset, guint32 * next_size)
+{
+
+  int ret = 0;
+
+  guint8 *next_start = (guint8 *) buf;
+
+  if (meta_data->state == STATE_NULL) {
+    ret =
+        metadata_parse_none (meta_data, buf, &bufsize, &next_start, next_size);
+    if (ret == 0)
+      meta_data->state = STATE_READING;
+    else
+      goto done;
+  }
+
+  switch (meta_data->img_type) {
+    case IMG_JPEG:
+      ret =
+          metadataparse_jpeg_parse (&meta_data->format_data.jpeg,
+          (guint8 *) buf, &bufsize, meta_data->offset_orig, &next_start,
+          next_size);
+      break;
+    case IMG_PNG:
+      ret =
+          metadataparse_png_parse (&meta_data->format_data.png,
+          (guint8 *) buf, &bufsize, meta_data->offset_orig, &next_start,
+          next_size);
+      break;
+    default:
+      /* unexpected */
+      ret = -1;
+      goto done;
+      break;
+  }
+
+  *next_offset = next_start - buf;
+  meta_data->offset_orig += *next_offset;
+
+done:
+
+  if (ret == 0) {
+    meta_data->state = STATE_DONE;
+  }
+
+  return ret;
+}
+
+void
+metadata_dispose (MetaData * meta_data)
+{
+
+  switch (meta_data->img_type) {
+    case IMG_JPEG:
+      metadataparse_jpeg_dispose (&meta_data->format_data.jpeg);
+      break;
+    case IMG_PNG:
+      metadataparse_png_dispose (&meta_data->format_data.png);
+      break;
+  }
+
+  metadata_chunk_array_free (&meta_data->strip_chunks);
+  metadata_chunk_array_free (&meta_data->inject_chunks);
+
+  if (meta_data->xmp_adapter) {
+    gst_object_unref (meta_data->xmp_adapter);
+    meta_data->xmp_adapter = NULL;
+  }
+
+  if (meta_data->iptc_adapter) {
+    gst_object_unref (meta_data->iptc_adapter);
+    meta_data->iptc_adapter = NULL;
+  }
+
+  if (meta_data->exif_adapter) {
+    gst_object_unref (meta_data->exif_adapter);
+    meta_data->exif_adapter = NULL;
+  }
+
+}
+
+/*
+ * static implementation
+ */
+
+/* find image type */
+static int
+metadata_parse_none (MetaData * meta_data, const guint8 * buf,
+    guint32 * bufsize, guint8 ** next_start, guint32 * next_size)
+{
+
+  int ret = -1;
+  GstAdapter **exif = NULL;
+  GstAdapter **iptc = NULL;
+  GstAdapter **xmp = NULL;
+
+  *next_start = (guint8 *) buf;
+
+  meta_data->img_type = IMG_NONE;
+
+  if (*bufsize < 3) {
+    *next_size = 3;
+    ret = 1;
+    goto done;
+  }
+
+  if (meta_data->option & META_OPT_EXIF)
+    exif = &meta_data->exif_adapter;
+  if (meta_data->option & META_OPT_IPTC)
+    iptc = &meta_data->iptc_adapter;
+  if (meta_data->option & META_OPT_XMP)
+    xmp = &meta_data->xmp_adapter;
+
+  if (buf[0] == 0xFF && buf[1] == 0xD8 && buf[2] == 0xFF) {
+    metadataparse_jpeg_init (&meta_data->format_data.jpeg, exif, iptc, xmp,
+        &meta_data->strip_chunks, &meta_data->inject_chunks);
+    ret = 0;
+    meta_data->img_type = IMG_JPEG;
+    goto done;
+  }
+
+  if (*bufsize < 8) {
+    *next_size = 8;
+    ret = 1;
+    goto done;
+  }
+
+  if (buf[0] == 0x89 && buf[1] == 0x50 && buf[2] == 0x4E && buf[3] == 0x47 &&
+      buf[4] == 0x0D && buf[5] == 0x0A && buf[6] == 0x1A && buf[7] == 0x0A) {
+    metadataparse_png_init (&meta_data->format_data.png, exif, iptc, xmp,
+        &meta_data->strip_chunks, &meta_data->inject_chunks);
+    ret = 0;
+    meta_data->img_type = IMG_PNG;
+    goto done;
+  }
+
+done:
+
+  return ret;
+}