1 files changed, 457 insertions, 0 deletions
diff --git a/gst/isomp4/descriptors.c b/gst/isomp4/descriptors.c
new file mode 100644
index 0000000..e7d5a5d
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+++ b/gst/isomp4/descriptors.c
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+/* Quicktime muxer plugin for GStreamer
+ * Copyright (C) 2008 Thiago Sousa Santos <thiagoss@embedded.ufcg.edu.br>
+ *
+ * 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.
+ */
+/*
+ * Unless otherwise indicated, Source Code is licensed under MIT license.
+ * See further explanation attached in License Statement (distributed in the file
+ * LICENSE).
+ *
+ * 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.
+ */
+
+#include "descriptors.h"
+
+/*
+ * Some mp4 structures (descriptors) use a coding scheme for
+ * representing its size.
+ * It is grouped in bytes. The 1st bit set to 1 means we need another byte,
+ * 0 otherwise. The remaining 7 bits are the useful values.
+ *
+ * The next set of functions handle those values
+ */
+
+/*
+ * Gets an unsigned integer and packs it into a 'expandable size' format
+ * (as used by mp4 descriptors)
+ * @size: the integer to be parsed
+ * @ptr: the array to place the result
+ * @array_size: the size of ptr array
+ */
+static void
+expandable_size_parse (guint64 size, guint8 * ptr, guint32 array_size)
+{
+  int index = 0;
+
+  memset (ptr, 0, sizeof (array_size));
+  while (size > 0 && index < array_size) {
+    ptr[index++] = (size > 0x7F ? 0x80 : 0x0) | (size & 0x7F);
+    size = size >> 7;
+  }
+}
+
+/*
+ * Gets how many positions in an array holding an 'expandable size'
+ * are really used
+ *
+ * @ptr: the array with the 'expandable size'
+ * @array_size: the size of ptr array
+ *
+ * Returns: the number of really used positions
+ */
+static guint64
+expandable_size_get_length (guint8 * ptr, guint32 array_size)
+{
+  gboolean next = TRUE;
+  guint32 index = 0;
+
+  while (next && index < array_size) {
+    next = ((ptr[index] & 0x80) == 1);
+    index++;
+  }
+  return index;
+}
+
+/*
+ * Initializers below
+ */
+
+static void
+desc_base_descriptor_init (BaseDescriptor * bd, guint8 tag, guint32 size)
+{
+  bd->tag = tag;
+  expandable_size_parse (size, bd->size, 4);
+}
+
+static void
+desc_dec_specific_info_init (DecoderSpecificInfoDescriptor * dsid)
+{
+  desc_base_descriptor_init (&dsid->base, DECODER_SPECIFIC_INFO_TAG, 0);
+  dsid->length = 0;
+  dsid->data = NULL;
+}
+
+DecoderSpecificInfoDescriptor *
+desc_dec_specific_info_new (void)
+{
+  DecoderSpecificInfoDescriptor *desc =
+      g_new0 (DecoderSpecificInfoDescriptor, 1);
+  desc_dec_specific_info_init (desc);
+  return desc;
+}
+
+static void
+desc_dec_conf_desc_init (DecoderConfigDescriptor * dcd)
+{
+  desc_base_descriptor_init (&dcd->base, DECODER_CONFIG_DESC_TAG, 0);
+  dcd->dec_specific_info = NULL;
+}
+
+static void
+desc_sl_conf_desc_init (SLConfigDescriptor * sl)
+{
+  desc_base_descriptor_init (&sl->base, SL_CONFIG_DESC_TAG, 0);
+  sl->predefined = 0x2;
+}
+
+void
+desc_es_init (ESDescriptor * es)
+{
+  desc_base_descriptor_init (&es->base, ES_DESCRIPTOR_TAG, 0);
+
+  es->id = 0;
+  es->flags = 0;
+  es->depends_on_es_id = 0;
+  es->ocr_es_id = 0;
+  es->url_length = 0;
+  es->url_string = NULL;
+
+  desc_dec_conf_desc_init (&es->dec_conf_desc);
+  desc_sl_conf_desc_init (&es->sl_conf_desc);
+}
+
+ESDescriptor *
+desc_es_descriptor_new (void)
+{
+  ESDescriptor *es = g_new0 (ESDescriptor, 1);
+
+  desc_es_init (es);
+  return es;
+}
+
+/*
+ * Deinitializers/Destructors below
+ */
+
+static void
+desc_base_descriptor_clear (BaseDescriptor * base)
+{
+}
+
+void
+desc_dec_specific_info_free (DecoderSpecificInfoDescriptor * dsid)
+{
+  desc_base_descriptor_clear (&dsid->base);
+  if (dsid->data) {
+    g_free (dsid->data);
+    dsid->data = NULL;
+  }
+  g_free (dsid);
+}
+
+static void
+desc_dec_conf_desc_clear (DecoderConfigDescriptor * dec)
+{
+  desc_base_descriptor_clear (&dec->base);
+  if (dec->dec_specific_info) {
+    desc_dec_specific_info_free (dec->dec_specific_info);
+  }
+}
+
+static void
+desc_sl_config_descriptor_clear (SLConfigDescriptor * sl)
+{
+  desc_base_descriptor_clear (&sl->base);
+}
+
+void
+desc_es_descriptor_clear (ESDescriptor * es)
+{
+  desc_base_descriptor_clear (&es->base);
+  if (es->url_string) {
+    g_free (es->url_string);
+    es->url_string = NULL;
+  }
+  desc_dec_conf_desc_clear (&es->dec_conf_desc);
+  desc_sl_config_descriptor_clear (&es->sl_conf_desc);
+}
+
+/*
+ * Size handling functions below
+ */
+
+void
+desc_dec_specific_info_alloc_data (DecoderSpecificInfoDescriptor * dsid,
+    guint32 size)
+{
+  if (dsid->data) {
+    g_free (dsid->data);
+  }
+  dsid->data = g_new0 (guint8, size);
+  dsid->length = size;
+}
+
+static void
+desc_base_descriptor_set_size (BaseDescriptor * bd, guint32 size)
+{
+  expandable_size_parse (size, bd->size, 4);
+}
+
+static guint64
+desc_base_descriptor_get_size (BaseDescriptor * bd)
+{
+  guint64 size = 0;
+
+  size += sizeof (guint8);
+  size += expandable_size_get_length (bd->size, 4) * sizeof (guint8);
+  return size;
+}
+
+static guint64
+desc_sl_config_descriptor_get_size (SLConfigDescriptor * sl_desc)
+{
+  guint64 size = 0;
+  guint64 extra_size = 0;
+
+  size += desc_base_descriptor_get_size (&sl_desc->base);
+  /* predefined */
+  extra_size += sizeof (guint8);
+
+  desc_base_descriptor_set_size (&sl_desc->base, extra_size);
+
+  return size + extra_size;
+}
+
+static guint64
+desc_dec_specific_info_get_size (DecoderSpecificInfoDescriptor * dsid)
+{
+  guint64 size = 0;
+  guint64 extra_size = 0;
+
+  size += desc_base_descriptor_get_size (&dsid->base);
+  extra_size += sizeof (guint8) * dsid->length;
+  desc_base_descriptor_set_size (&dsid->base, extra_size);
+  return size + extra_size;
+}
+
+static guint64
+desc_dec_config_descriptor_get_size (DecoderConfigDescriptor * dec_desc)
+{
+  guint64 size = 0;
+  guint64 extra_size = 0;
+
+  size += desc_base_descriptor_get_size (&dec_desc->base);
+  /* object type */
+  extra_size += sizeof (guint8);
+  /* stream type */
+  extra_size += sizeof (guint8);
+  /* buffer size */
+  extra_size += sizeof (guint8) * 3;
+  /* max bitrate */
+  extra_size += sizeof (guint32);
+  /* avg bitrate */
+  extra_size += sizeof (guint32);
+  if (dec_desc->dec_specific_info) {
+    extra_size += desc_dec_specific_info_get_size (dec_desc->dec_specific_info);
+  }
+
+  desc_base_descriptor_set_size (&dec_desc->base, extra_size);
+  return size + extra_size;
+}
+
+static guint64
+desc_es_descriptor_get_size (ESDescriptor * es)
+{
+  guint64 size = 0;
+  guint64 extra_size = 0;
+
+  size += desc_base_descriptor_get_size (&es->base);
+  /* id */
+  extra_size += sizeof (guint16);
+  /* flags */
+  extra_size += sizeof (guint8);
+  /* depends_on_es_id */
+  if (es->flags & 0x80) {
+    extra_size += sizeof (guint16);
+  }
+  if (es->flags & 0x40) {
+    /* url_length */
+    extra_size += sizeof (guint8);
+    /* url */
+    extra_size += sizeof (gchar) * es->url_length;
+  }
+  if (es->flags & 0x20) {
+    /* ocr_es_id */
+    extra_size += sizeof (guint16);
+  }
+
+  extra_size += desc_dec_config_descriptor_get_size (&es->dec_conf_desc);
+  extra_size += desc_sl_config_descriptor_get_size (&es->sl_conf_desc);
+
+  desc_base_descriptor_set_size (&es->base, extra_size);
+
+  return size + extra_size;
+}
+
+static gboolean
+desc_es_descriptor_check_stream_dependency (ESDescriptor * es)
+{
+  return es->flags & 0x80;
+}
+
+static gboolean
+desc_es_descriptor_check_url_flag (ESDescriptor * es)
+{
+  return es->flags & 0x40;
+}
+
+static gboolean
+desc_es_descriptor_check_ocr (ESDescriptor * es)
+{
+  return es->flags & 0x20;
+}
+
+/* Copy/Serializations Functions below */
+
+static guint64
+desc_base_descriptor_copy_data (BaseDescriptor * desc, guint8 ** buffer,
+    guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  prop_copy_uint8 (desc->tag, buffer, size, offset);
+  prop_copy_uint8_array (desc->size, expandable_size_get_length (desc->size, 4),
+      buffer, size, offset);
+  return original_offset - *offset;
+}
+
+static guint64
+desc_sl_config_descriptor_copy_data (SLConfigDescriptor * desc,
+    guint8 ** buffer, guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
+    return 0;
+  }
+  /* predefined attribute */
+  prop_copy_uint8 (desc->predefined, buffer, size, offset);
+
+  return *offset - original_offset;
+}
+
+static guint64
+desc_dec_specific_info_copy_data (DecoderSpecificInfoDescriptor * desc,
+    guint8 ** buffer, guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
+    return 0;
+  }
+  prop_copy_uint8_array (desc->data, desc->length, buffer, size, offset);
+
+  return *offset - original_offset;
+}
+
+static guint64
+desc_dec_config_descriptor_copy_data (DecoderConfigDescriptor * desc,
+    guint8 ** buffer, guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint8 (desc->object_type, buffer, size, offset);
+
+  prop_copy_uint8 (desc->stream_type, buffer, size, offset);
+  prop_copy_uint8_array (desc->buffer_size_DB, 3, buffer, size, offset);
+
+  prop_copy_uint32 (desc->max_bitrate, buffer, size, offset);
+  prop_copy_uint32 (desc->avg_bitrate, buffer, size, offset);
+
+  if (desc->dec_specific_info) {
+    if (!desc_dec_specific_info_copy_data (desc->dec_specific_info, buffer,
+            size, offset)) {
+      return 0;
+    }
+  }
+
+  return *offset - original_offset;
+}
+
+guint64
+desc_es_descriptor_copy_data (ESDescriptor * desc, guint8 ** buffer,
+    guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  /* must call this twice to have size fields of all contained descriptors set
+   * correctly, and to have the size of the size fields taken into account */
+  desc_es_descriptor_get_size (desc);
+  desc_es_descriptor_get_size (desc);
+
+  if (!desc_base_descriptor_copy_data (&desc->base, buffer, size, offset)) {
+    return 0;
+  }
+  /* id and flags */
+  prop_copy_uint16 (desc->id, buffer, size, offset);
+  prop_copy_uint8 (desc->flags, buffer, size, offset);
+
+  if (desc_es_descriptor_check_stream_dependency (desc)) {
+    prop_copy_uint16 (desc->depends_on_es_id, buffer, size, offset);
+  }
+
+  if (desc_es_descriptor_check_url_flag (desc)) {
+    prop_copy_size_string (desc->url_string, desc->url_length, buffer, size,
+        offset);
+  }
+
+  if (desc_es_descriptor_check_ocr (desc)) {
+    prop_copy_uint16 (desc->ocr_es_id, buffer, size, offset);
+  }
+
+  if (!desc_dec_config_descriptor_copy_data (&desc->dec_conf_desc, buffer, size,
+          offset)) {
+    return 0;
+  }
+
+  if (!desc_sl_config_descriptor_copy_data (&desc->sl_conf_desc, buffer, size,
+          offset)) {
+    return 0;
+  }
+
+  return *offset - original_offset;
+}