diff -r 4b0c6ed43234 -r 8e837d1bf446 gst_plugins_good/gst/qtmux/atoms.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_good/gst/qtmux/atoms.c	Wed Mar 24 18:04:17 2010 -0500
@@ -0,0 +1,3173 @@
+/* Quicktime muxer plugin for GStreamer
+ * Copyright (C) 2008 Thiago Sousa Santos <thiagoss@embedded.ufcg.edu.br>
+ * Copyright (C) 2008 Mark Nauwelaerts <mnauw@users.sf.net>
+ *
+ * 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 "atoms.h"
+#include <string.h>
+#include <glib.h>
+
+/* only needed for gst_util_uint64_scale */
+#include <gst/gst.h>
+
+/**
+ * Creates a new AtomsContext for the given flavor.
+ */
+AtomsContext *
+atoms_context_new (AtomsTreeFlavor flavor)
+{
+  AtomsContext *context = g_new0 (AtomsContext, 1);
+  context->flavor = flavor;
+  return context;
+}
+
+/**
+ * Frees an AtomsContext and all memory associated with it
+ */
+void
+atoms_context_free (AtomsContext * context)
+{
+  g_free (context);
+}
+
+/* -- creation, initialization, clear and free functions -- */
+
+#define SECS_PER_DAY (24 * 60 * 60)
+#define LEAP_YEARS_FROM_1904_TO_1970 17
+
+static guint64
+get_current_qt_time ()
+{
+  GTimeVal timeval;
+
+  g_get_current_time (&timeval);
+  /* FIXME this should use UTC coordinated time */
+  return timeval.tv_sec + (((1970 - 1904) * (guint64) 365) +
+      LEAP_YEARS_FROM_1904_TO_1970) * SECS_PER_DAY;
+}
+
+static void
+common_time_info_init (TimeInfo * ti)
+{
+  ti->creation_time = ti->modification_time = get_current_qt_time ();
+  ti->timescale = 0;
+  ti->duration = 0;
+}
+
+static void
+atom_header_set (Atom * header, guint32 fourcc, gint32 size, gint64 ext_size)
+{
+  header->type = fourcc;
+  header->size = size;
+  header->extended_size = ext_size;
+}
+
+static void
+atom_clear (Atom * atom)
+{
+}
+
+static void
+atom_full_init (AtomFull * full, guint32 fourcc, gint32 size, gint64 ext_size,
+    guint8 version, guint8 flags[3])
+{
+  atom_header_set (&(full->header), fourcc, size, ext_size);
+  full->version = version;
+  full->flags[0] = flags[0];
+  full->flags[1] = flags[1];
+  full->flags[2] = flags[2];
+}
+
+static void
+atom_full_clear (AtomFull * full)
+{
+  atom_clear (&full->header);
+}
+
+static void
+atom_full_free (AtomFull * full)
+{
+  atom_full_clear (full);
+  g_free (full);
+}
+
+static AtomInfo *
+build_atom_info_wrapper (Atom * atom, gpointer copy_func, gpointer free_func)
+{
+  AtomInfo *info = NULL;
+
+  if (atom) {
+    info = g_new0 (AtomInfo, 1);
+
+    info->atom = atom;
+    info->copy_data_func = copy_func;
+    info->free_func = free_func;
+  }
+
+  return info;
+}
+
+static GList *
+atom_info_list_prepend_atom (GList * ai, Atom * atom,
+    AtomCopyDataFunc copy_func, AtomFreeFunc free_func)
+{
+  if (atom)
+    return g_list_prepend (ai,
+        build_atom_info_wrapper (atom, (gpointer)copy_func, (gpointer)free_func));
+  else
+    return ai;
+}
+
+static void
+atom_info_list_free (GList * ai)
+{
+  while (ai) {
+    AtomInfo *info = (AtomInfo *) ai->data;
+
+    info->free_func (info->atom);
+    g_free (info);
+    ai = g_list_delete_link (ai, ai);
+  }
+}
+
+static AtomData *
+atom_data_new (guint32 fourcc)
+{
+  AtomData *data = g_new0 (AtomData, 1);
+
+  atom_header_set (&data->header, fourcc, 0, 0);
+  return data;
+}
+
+static void
+atom_data_alloc_mem (AtomData * data, guint32 size)
+{
+  if (data->data) {
+    g_free (data->data);
+  }
+  data->data = g_new0 (guint8, size);
+  data->datalen = size;
+}
+
+static AtomData *
+atom_data_new_from_gst_buffer (guint32 fourcc, const GstBuffer * buf)
+{
+  AtomData *data = atom_data_new (fourcc);
+
+  atom_data_alloc_mem (data, GST_BUFFER_SIZE (buf));
+  g_memmove (data->data, GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
+  return data;
+}
+
+static void
+atom_data_free (AtomData * data)
+{
+  atom_clear (&data->header);
+  g_free (data->data);
+  g_free (data);
+}
+
+static void
+atom_ftyp_init (AtomFTYP * ftyp, guint32 major, guint32 version, GList * brands)
+{
+  gint index;
+  GList *it = NULL;
+
+  atom_header_set (&ftyp->header, FOURCC_ftyp, 16, 0);
+  ftyp->major_brand = major;
+  ftyp->version = version;
+
+  /* always include major brand as compatible brand */
+  ftyp->compatible_brands_size = g_list_length (brands) + 1;
+  ftyp->compatible_brands = g_new (guint32, ftyp->compatible_brands_size);
+
+  ftyp->compatible_brands[0] = major;
+  index = 1;
+  for (it = brands; it != NULL; it = g_list_next (it)) {
+    ftyp->compatible_brands[index++] = GPOINTER_TO_UINT (it->data);
+  }
+}
+
+AtomFTYP *
+atom_ftyp_new (AtomsContext * context, guint32 major, guint32 version,
+    GList * brands)
+{
+  AtomFTYP *ftyp = g_new0 (AtomFTYP, 1);
+
+  atom_ftyp_init (ftyp, major, version, brands);
+  return ftyp;
+}
+
+void
+atom_ftyp_free (AtomFTYP * ftyp)
+{
+  atom_clear (&ftyp->header);
+  g_free (ftyp->compatible_brands);
+  ftyp->compatible_brands = NULL;
+  g_free (ftyp);
+}
+
+static void
+atom_esds_init (AtomESDS * esds)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&esds->header, FOURCC_esds, 0, 0, 0, flags);
+  desc_es_init (&esds->es);
+}
+
+static AtomESDS *
+atom_esds_new ()
+{
+  AtomESDS *esds = g_new0 (AtomESDS, 1);
+
+  atom_esds_init (esds);
+  return esds;
+}
+
+static void
+atom_esds_free (AtomESDS * esds)
+{
+  atom_full_clear (&esds->header);
+  desc_es_descriptor_clear (&esds->es);
+  g_free (esds);
+}
+
+static AtomFRMA *
+atom_frma_new ()
+{
+  AtomFRMA *frma = g_new0 (AtomFRMA, 1);
+
+  atom_header_set (&frma->header, FOURCC_frma, 0, 0);
+  return frma;
+}
+
+static void
+atom_frma_free (AtomFRMA * frma)
+{
+  atom_clear (&frma->header);
+  g_free (frma);
+}
+
+static AtomWAVE *
+atom_wave_new ()
+{
+  AtomWAVE *wave = g_new0 (AtomWAVE, 1);
+
+  atom_header_set (&wave->header, FOURCC_wave, 0, 0);
+  return wave;
+}
+
+static void
+atom_wave_free (AtomWAVE * wave)
+{
+  atom_clear (&wave->header);
+  atom_info_list_free (wave->extension_atoms);
+  g_free (wave);
+}
+
+static void
+atom_sample_entry_init (SampleTableEntry * se, guint32 type)
+{
+  atom_header_set (&se->header, type, 0, 0);
+
+  memset (se->reserved, 0, sizeof (guint8) * 6);
+  se->data_reference_index = 0;
+}
+
+static void
+atom_sample_entry_free (SampleTableEntry * se)
+{
+  atom_clear (&se->header);
+}
+
+static void
+sample_entry_mp4a_init (SampleTableEntryMP4A * mp4a)
+{
+  atom_sample_entry_init (&mp4a->se, FOURCC_mp4a);
+
+  mp4a->version = 0;
+  mp4a->revision_level = 0;
+  mp4a->vendor = 0;
+  mp4a->channels = 2;
+  mp4a->sample_size = 16;
+  mp4a->compression_id = 0;
+  mp4a->packet_size = 0;
+  mp4a->sample_rate = 0;
+  /* following only used if version is 1 */
+  mp4a->samples_per_packet = 0;
+  mp4a->bytes_per_packet = 0;
+  mp4a->bytes_per_frame = 0;
+  mp4a->bytes_per_sample = 0;
+
+  mp4a->extension_atoms = NULL;
+}
+
+static SampleTableEntryMP4A *
+sample_entry_mp4a_new ()
+{
+  SampleTableEntryMP4A *mp4a = g_new0 (SampleTableEntryMP4A, 1);
+
+  sample_entry_mp4a_init (mp4a);
+  return mp4a;
+}
+
+static void
+sample_entry_mp4a_free (SampleTableEntryMP4A * mp4a)
+{
+  atom_sample_entry_free (&mp4a->se);
+  atom_info_list_free (mp4a->extension_atoms);
+  g_free (mp4a);
+}
+
+static void
+sample_entry_mp4v_init (SampleTableEntryMP4V * mp4v, AtomsContext * context)
+{
+  atom_sample_entry_init (&mp4v->se, FOURCC_mp4v);
+
+  mp4v->version = 0;
+  mp4v->revision_level = 0;
+  mp4v->vendor = 0;
+
+  mp4v->temporal_quality = 0;
+  mp4v->spatial_quality = 0;
+
+  /* qt and ISO base media do not contradict, and examples agree */
+  mp4v->horizontal_resolution = 0x00480000;
+  mp4v->vertical_resolution = 0x00480000;
+
+  mp4v->datasize = 0;
+  mp4v->frame_count = 1;
+
+  memset (mp4v->compressor, 0, sizeof (guint8) * 32);
+
+  mp4v->depth = 0;
+  mp4v->color_table_id = 0;
+
+  mp4v->extension_atoms = NULL;
+}
+
+static void
+sample_entry_mp4v_free (SampleTableEntryMP4V * mp4v)
+{
+  atom_sample_entry_free (&mp4v->se);
+  atom_info_list_free (mp4v->extension_atoms);
+  g_free (mp4v);
+}
+
+static SampleTableEntryMP4V *
+sample_entry_mp4v_new (AtomsContext * context)
+{
+  SampleTableEntryMP4V *mp4v = g_new0 (SampleTableEntryMP4V, 1);
+
+  sample_entry_mp4v_init (mp4v, context);
+  return mp4v;
+}
+
+static void
+atom_stsd_init (AtomSTSD * stsd)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&stsd->header, FOURCC_stsd, 0, 0, 0, flags);
+  stsd->entries = NULL;
+}
+
+static void
+atom_stsd_clear (AtomSTSD * stsd)
+{
+  GList *walker;
+
+  atom_full_clear (&stsd->header);
+  walker = stsd->entries;
+  while (walker) {
+    GList *aux = walker;
+    SampleTableEntry *se = (SampleTableEntry *) aux->data;
+
+    walker = g_list_next (walker);
+    stsd->entries = g_list_remove_link (stsd->entries, aux);
+
+    switch (se->kind) {
+      case AUDIO:
+        sample_entry_mp4a_free ((SampleTableEntryMP4A *) se);
+        break;
+      case VIDEO:
+        sample_entry_mp4v_free ((SampleTableEntryMP4V *) se);
+        break;
+      default:
+        /* best possible cleanup */
+        atom_sample_entry_free (se);
+    }
+    g_list_free (aux);
+  }
+}
+
+static void
+atom_ctts_init (AtomCTTS * ctts)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&ctts->header, FOURCC_ctts, 0, 0, 0, flags);
+  ctts->entries = NULL;
+}
+
+static AtomCTTS *
+atom_ctts_new ()
+{
+  AtomCTTS *ctts = g_new0 (AtomCTTS, 1);
+
+  atom_ctts_init (ctts);
+  return ctts;
+}
+
+static void
+atom_ctts_free (AtomCTTS * ctts)
+{
+  GList *walker;
+
+  atom_full_clear (&ctts->header);
+  walker = ctts->entries;
+  while (walker) {
+    GList *aux = walker;
+
+    walker = g_list_next (walker);
+    ctts->entries = g_list_remove_link (ctts->entries, aux);
+    g_free ((CTTSEntry *) aux->data);
+    g_list_free (aux);
+  }
+  g_free (ctts);
+}
+
+static void
+atom_stts_init (AtomSTTS * stts)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&stts->header, FOURCC_stts, 0, 0, 0, flags);
+  stts->entries = NULL;
+}
+
+static void
+atom_stts_clear (AtomSTTS * stts)
+{
+  GList *walker;
+
+  atom_full_clear (&stts->header);
+  walker = stts->entries;
+  while (walker) {
+    GList *aux = walker;
+
+    walker = g_list_next (walker);
+    stts->entries = g_list_remove_link (stts->entries, aux);
+    g_free ((STTSEntry *) aux->data);
+    g_list_free (aux);
+  }
+  stts->n_entries = 0;
+}
+
+static void
+atom_stsz_init (AtomSTSZ * stsz)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&stsz->header, FOURCC_stsz, 0, 0, 0, flags);
+  stsz->sample_size = 0;
+  stsz->table_size = 0;
+  stsz->entries = NULL;
+}
+
+static void
+atom_stsz_clear (AtomSTSZ * stsz)
+{
+  atom_full_clear (&stsz->header);
+  g_list_free (stsz->entries);
+  stsz->entries = NULL;
+  stsz->table_size = 0;
+}
+
+static void
+atom_stsc_init (AtomSTSC * stsc)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&stsc->header, FOURCC_stsc, 0, 0, 0, flags);
+  stsc->entries = NULL;
+  stsc->n_entries = 0;
+}
+
+static void
+atom_stsc_clear (AtomSTSC * stsc)
+{
+  GList *walker;
+
+  atom_full_clear (&stsc->header);
+  walker = stsc->entries;
+  while (walker) {
+    GList *aux = walker;
+
+    walker = g_list_next (walker);
+    stsc->entries = g_list_remove_link (stsc->entries, aux);
+    g_free ((STSCEntry *) aux->data);
+    g_list_free (aux);
+  }
+  stsc->n_entries = 0;
+}
+
+static void
+atom_co64_init (AtomSTCO64 * co64)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&co64->header, FOURCC_co64, 0, 0, 0, flags);
+  co64->entries = NULL;
+  co64->n_entries = 0;
+}
+
+static void
+atom_stco64_clear (AtomSTCO64 * stco64)
+{
+  GList *walker;
+
+  atom_full_clear (&stco64->header);
+  walker = stco64->entries;
+  while (walker) {
+    GList *aux = walker;
+
+    walker = g_list_next (walker);
+    stco64->entries = g_list_remove_link (stco64->entries, aux);
+    g_free ((guint64 *) aux->data);
+    g_list_free (aux);
+  }
+  stco64->n_entries = 0;
+}
+
+static void
+atom_stss_init (AtomSTSS * stss)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&stss->header, FOURCC_stss, 0, 0, 0, flags);
+  stss->entries = NULL;
+  stss->n_entries = 0;
+}
+
+static void
+atom_stss_clear (AtomSTSS * stss)
+{
+  atom_full_clear (&stss->header);
+  g_list_free (stss->entries);
+  stss->entries = NULL;
+  stss->n_entries = 0;
+}
+
+static void
+atom_stbl_init (AtomSTBL * stbl)
+{
+  atom_header_set (&stbl->header, FOURCC_stbl, 0, 0);
+
+  atom_stts_init (&stbl->stts);
+  atom_stss_init (&stbl->stss);
+  atom_stsd_init (&stbl->stsd);
+  atom_stsz_init (&stbl->stsz);
+  atom_stsc_init (&stbl->stsc);
+  stbl->ctts = NULL;
+
+  atom_co64_init (&stbl->stco64);
+}
+
+static void
+atom_stbl_clear (AtomSTBL * stbl)
+{
+  atom_clear (&stbl->header);
+  atom_stsd_clear (&stbl->stsd);
+  atom_stts_clear (&stbl->stts);
+  atom_stss_clear (&stbl->stss);
+  atom_stsc_clear (&stbl->stsc);
+  atom_stsz_clear (&stbl->stsz);
+  if (stbl->ctts) {
+    atom_ctts_free (stbl->ctts);
+  }
+  atom_stco64_clear (&stbl->stco64);
+}
+
+static void
+atom_vmhd_init (AtomVMHD * vmhd, AtomsContext * context)
+{
+  guint8 flags[3] = { 0, 0, 1 };
+
+  atom_full_init (&vmhd->header, FOURCC_vmhd, 0, 0, 0, flags);
+  vmhd->graphics_mode = 0x0;
+  memset (vmhd->opcolor, 0, sizeof (guint16) * 3);
+
+  if (context->flavor == ATOMS_TREE_FLAVOR_MOV) {
+    vmhd->graphics_mode = 0x40;
+    vmhd->opcolor[0] = 32768;
+    vmhd->opcolor[1] = 32768;
+    vmhd->opcolor[2] = 32768;
+  }
+}
+
+static AtomVMHD *
+atom_vmhd_new (AtomsContext * context)
+{
+  AtomVMHD *vmhd = g_new0 (AtomVMHD, 1);
+
+  atom_vmhd_init (vmhd, context);
+  return vmhd;
+}
+
+static void
+atom_vmhd_free (AtomVMHD * vmhd)
+{
+  atom_full_clear (&vmhd->header);
+  g_free (vmhd);
+}
+
+static void
+atom_smhd_init (AtomSMHD * smhd)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&smhd->header, FOURCC_smhd, 0, 0, 0, flags);
+  smhd->balance = 0;
+  smhd->reserved = 0;
+}
+
+static AtomSMHD *
+atom_smhd_new ()
+{
+  AtomSMHD *smhd = g_new0 (AtomSMHD, 1);
+
+  atom_smhd_init (smhd);
+  return smhd;
+}
+
+static void
+atom_smhd_free (AtomSMHD * smhd)
+{
+  atom_full_clear (&smhd->header);
+  g_free (smhd);
+}
+
+static void
+atom_hmhd_free (AtomHMHD * hmhd)
+{
+  atom_full_clear (&hmhd->header);
+  g_free (hmhd);
+}
+
+static void
+atom_hdlr_init (AtomHDLR * hdlr)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&hdlr->header, FOURCC_hdlr, 0, 0, 0, flags);
+
+  hdlr->component_type = 0;
+  hdlr->handler_type = 0;
+  hdlr->manufacturer = 0;
+  hdlr->flags = 0;
+  hdlr->flags_mask = 0;
+  hdlr->name = g_strdup ("");
+}
+
+static AtomHDLR *
+atom_hdlr_new ()
+{
+  AtomHDLR *hdlr = g_new0 (AtomHDLR, 1);
+
+  atom_hdlr_init (hdlr);
+  return hdlr;
+}
+
+static void
+atom_hdlr_clear (AtomHDLR * hdlr)
+{
+  atom_full_clear (&hdlr->header);
+  if (hdlr->name) {
+    g_free (hdlr->name);
+    hdlr->name = NULL;
+  }
+}
+
+static void
+atom_hdlr_free (AtomHDLR * hdlr)
+{
+  atom_hdlr_clear (hdlr);
+  g_free (hdlr);
+}
+
+static void
+atom_url_init (AtomURL * url)
+{
+  guint8 flags[3] = { 0, 0, 1 };
+
+  atom_full_init (&url->header, FOURCC_url_, 0, 0, 0, flags);
+  url->location = NULL;
+}
+
+static void
+atom_url_free (AtomURL * url)
+{
+  atom_full_clear (&url->header);
+  if (url->location) {
+    g_free (url->location);
+    url->location = NULL;
+  }
+  g_free (url);
+}
+
+static AtomURL *
+atom_url_new ()
+{
+  AtomURL *url = g_new0 (AtomURL, 1);
+
+  atom_url_init (url);
+  return url;
+}
+
+static AtomFull *
+atom_alis_new ()
+{
+  guint8 flags[3] = { 0, 0, 1 };
+  AtomFull *alis = g_new0 (AtomFull, 1);
+
+  atom_full_init (alis, FOURCC_alis, 0, 0, 0, flags);
+  return alis;
+}
+
+static void
+atom_dref_init (AtomDREF * dref, AtomsContext * context)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&dref->header, FOURCC_dref, 0, 0, 0, flags);
+
+  /* in either case, alis or url init arranges to set self-contained flag */
+  if (context->flavor == ATOMS_TREE_FLAVOR_MOV) {
+    /* alis dref for qt */
+    AtomFull *alis = atom_alis_new ();
+    dref->entries = g_list_append (dref->entries, alis);
+  } else {
+    /* url for iso spec, as 'alis' not specified there */
+    AtomURL *url = atom_url_new ();
+    dref->entries = g_list_append (dref->entries, url);
+  }
+}
+
+static void
+atom_dref_clear (AtomDREF * dref)
+{
+  GList *walker;
+
+  atom_full_clear (&dref->header);
+  walker = dref->entries;
+  while (walker) {
+    GList *aux = walker;
+    Atom *atom = (Atom *) aux->data;
+
+    walker = g_list_next (walker);
+    dref->entries = g_list_remove_link (dref->entries, aux);
+    switch (atom->type) {
+      case FOURCC_alis:
+        atom_full_free ((AtomFull *) atom);
+        break;
+      case FOURCC_url_:
+        atom_url_free ((AtomURL *) atom);
+        break;
+      default:
+        /* we do nothing, better leak than crash */
+        break;
+    }
+    g_list_free (aux);
+  }
+}
+
+static void
+atom_dinf_init (AtomDINF * dinf, AtomsContext * context)
+{
+  atom_header_set (&dinf->header, FOURCC_dinf, 0, 0);
+  atom_dref_init (&dinf->dref, context);
+}
+
+static void
+atom_dinf_clear (AtomDINF * dinf)
+{
+  atom_clear (&dinf->header);
+  atom_dref_clear (&dinf->dref);
+}
+
+static void
+atom_minf_init (AtomMINF * minf, AtomsContext * context)
+{
+  atom_header_set (&minf->header, FOURCC_minf, 0, 0);
+
+  minf->vmhd = NULL;
+  minf->smhd = NULL;
+  minf->hmhd = NULL;
+
+  if (context->flavor == ATOMS_TREE_FLAVOR_MOV) {
+    minf->hdlr = atom_hdlr_new ();
+    minf->hdlr->component_type = FOURCC_dhlr;
+    minf->hdlr->handler_type = FOURCC_alis;
+  } else {
+    minf->hdlr = NULL;
+  }
+  atom_dinf_init (&minf->dinf, context);
+  atom_stbl_init (&minf->stbl);
+}
+
+static void
+atom_minf_clear_handlers (AtomMINF * minf)
+{
+  if (minf->vmhd) {
+    atom_vmhd_free (minf->vmhd);
+    minf->vmhd = NULL;
+  }
+  if (minf->smhd) {
+    atom_smhd_free (minf->smhd);
+    minf->smhd = NULL;
+  }
+  if (minf->hmhd) {
+    atom_hmhd_free (minf->hmhd);
+    minf->hmhd = NULL;
+  }
+}
+
+static void
+atom_minf_clear (AtomMINF * minf)
+{
+  atom_clear (&minf->header);
+  atom_minf_clear_handlers (minf);
+  if (minf->hdlr) {
+    atom_hdlr_free (minf->hdlr);
+  }
+  atom_dinf_clear (&minf->dinf);
+  atom_stbl_clear (&minf->stbl);
+}
+
+static void
+atom_mdhd_init (AtomMDHD * mdhd)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&mdhd->header, FOURCC_mdhd, 0, 0, 0, flags);
+  common_time_info_init (&mdhd->time_info);
+  mdhd->language_code = 0;
+  mdhd->quality = 0;
+}
+
+static void
+atom_mdhd_clear (AtomMDHD * mdhd)
+{
+  atom_full_clear (&mdhd->header);
+}
+
+static void
+atom_mdia_init (AtomMDIA * mdia, AtomsContext * context)
+{
+  atom_header_set (&mdia->header, FOURCC_mdia, 0, 0);
+
+  atom_mdhd_init (&mdia->mdhd);
+  atom_hdlr_init (&mdia->hdlr);
+  atom_minf_init (&mdia->minf, context);
+}
+
+static void
+atom_mdia_clear (AtomMDIA * mdia)
+{
+  atom_clear (&mdia->header);
+  atom_mdhd_clear (&mdia->mdhd);
+  atom_hdlr_clear (&mdia->hdlr);
+  atom_minf_clear (&mdia->minf);
+}
+
+static void
+atom_tkhd_init (AtomTKHD * tkhd, AtomsContext * context)
+{
+  /*
+   * flags info
+   * 1 -> track enabled
+   * 2 -> track in movie
+   * 4 -> track in preview
+   */
+  guint8 flags[3] = { 0, 0, 7 };
+
+  atom_full_init (&tkhd->header, FOURCC_tkhd, 0, 0, 0, flags);
+
+  tkhd->creation_time = tkhd->modification_time = get_current_qt_time ();
+  tkhd->duration = 0;
+  tkhd->track_ID = 0;
+  tkhd->reserved = 0;
+
+  tkhd->reserved2[0] = tkhd->reserved2[1] = 0;
+  tkhd->layer = 0;
+  tkhd->alternate_group = 0;
+  tkhd->volume = 0;
+  tkhd->reserved3 = 0;
+  memset (tkhd->matrix, 0, sizeof (guint32) * 9);
+  tkhd->matrix[0] = 1 << 16;
+  tkhd->matrix[4] = 1 << 16;
+  tkhd->matrix[8] = 16384 << 16;
+  tkhd->width = 0;
+  tkhd->height = 0;
+}
+
+static void
+atom_tkhd_clear (AtomTKHD * tkhd)
+{
+  atom_full_clear (&tkhd->header);
+}
+
+static void
+atom_trak_init (AtomTRAK * trak, AtomsContext * context)
+{
+  atom_header_set (&trak->header, FOURCC_trak, 0, 0);
+
+  atom_tkhd_init (&trak->tkhd, context);
+  atom_mdia_init (&trak->mdia, context);
+}
+
+AtomTRAK *
+atom_trak_new (AtomsContext * context)
+{
+  AtomTRAK *trak = g_new0 (AtomTRAK, 1);
+
+  atom_trak_init (trak, context);
+  return trak;
+}
+
+static void
+atom_trak_free (AtomTRAK * trak)
+{
+  atom_clear (&trak->header);
+  atom_tkhd_clear (&trak->tkhd);
+  atom_mdia_clear (&trak->mdia);
+  g_free (trak);
+}
+
+static void
+atom_ilst_init (AtomILST * ilst)
+{
+  atom_header_set (&ilst->header, FOURCC_ilst, 0, 0);
+  ilst->entries = NULL;
+}
+
+static AtomILST *
+atom_ilst_new ()
+{
+  AtomILST *ilst = g_new0 (AtomILST, 1);
+
+  atom_ilst_init (ilst);
+  return ilst;
+}
+
+static void
+atom_ilst_free (AtomILST * ilst)
+{
+  if (ilst->entries)
+    atom_info_list_free (ilst->entries);
+  atom_clear (&ilst->header);
+  g_free (ilst);
+}
+
+static void
+atom_meta_init (AtomMETA * meta)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&meta->header, FOURCC_meta, 0, 0, 0, flags);
+  atom_hdlr_init (&meta->hdlr);
+  /* FIXME (ISOM says this is always 0) */
+  meta->hdlr.component_type = FOURCC_mhlr;
+  meta->hdlr.handler_type = FOURCC_mdir;
+  meta->ilst = NULL;
+}
+
+static AtomMETA *
+atom_meta_new ()
+{
+  AtomMETA *meta = g_new0 (AtomMETA, 1);
+
+  atom_meta_init (meta);
+  return meta;
+}
+
+static void
+atom_meta_free (AtomMETA * meta)
+{
+  atom_full_clear (&meta->header);
+  atom_hdlr_clear (&meta->hdlr);
+  if (meta->ilst)
+    atom_ilst_free (meta->ilst);
+  meta->ilst = NULL;
+  g_free (meta);
+}
+
+static void
+atom_udta_init (AtomUDTA * udta)
+{
+  atom_header_set (&udta->header, FOURCC_udta, 0, 0);
+  udta->meta = NULL;
+}
+
+static AtomUDTA *
+atom_udta_new ()
+{
+  AtomUDTA *udta = g_new0 (AtomUDTA, 1);
+
+  atom_udta_init (udta);
+  return udta;
+}
+
+static void
+atom_udta_free (AtomUDTA * udta)
+{
+  atom_clear (&udta->header);
+  if (udta->meta)
+    atom_meta_free (udta->meta);
+  udta->meta = NULL;
+  if (udta->entries)
+    atom_info_list_free (udta->entries);
+  g_free (udta);
+}
+
+static void
+atom_tag_data_init (AtomTagData * data)
+{
+  guint8 flags[] = { 0, 0, 0 };
+
+  atom_full_init (&data->header, FOURCC_data, 0, 0, 0, flags);
+}
+
+static void
+atom_tag_data_clear (AtomTagData * data)
+{
+  atom_full_clear (&data->header);
+  g_free (data->data);
+  data->datalen = 0;
+}
+
+/*
+ * Fourcc is the tag fourcc
+ * flags will be truncated to 24bits
+ */
+static AtomTag *
+atom_tag_new (guint32 fourcc, guint32 flags_as_uint)
+{
+  AtomTag *tag = g_new0 (AtomTag, 1);
+
+  tag->header.type = fourcc;
+  atom_tag_data_init (&tag->data);
+  tag->data.header.flags[2] = flags_as_uint & 0xFF;
+  tag->data.header.flags[1] = (flags_as_uint & 0xFF00) >> 8;
+  tag->data.header.flags[0] = (flags_as_uint & 0xFF0000) >> 16;
+  return tag;
+}
+
+static void
+atom_tag_free (AtomTag * tag)
+{
+  atom_clear (&tag->header);
+  atom_tag_data_clear (&tag->data);
+  g_free (tag);
+}
+
+static void
+atom_mvhd_init (AtomMVHD * mvhd)
+{
+  guint8 flags[3] = { 0, 0, 0 };
+
+  atom_full_init (&(mvhd->header), FOURCC_mvhd, sizeof (AtomMVHD), 0, 0, flags);
+
+  common_time_info_init (&mvhd->time_info);
+
+  mvhd->prefered_rate = 1 << 16;
+  mvhd->volume = 1 << 8;
+  mvhd->reserved3 = 0;
+  memset (mvhd->reserved4, 0, sizeof (guint32[2]));
+
+  memset (mvhd->matrix, 0, sizeof (guint32[9]));
+  mvhd->matrix[0] = 1 << 16;
+  mvhd->matrix[4] = 1 << 16;
+  mvhd->matrix[8] = 16384 << 16;
+
+  mvhd->preview_time = 0;
+  mvhd->preview_duration = 0;
+  mvhd->poster_time = 0;
+  mvhd->selection_time = 0;
+  mvhd->selection_duration = 0;
+  mvhd->current_time = 0;
+
+  mvhd->next_track_id = 1;
+}
+
+static void
+atom_mvhd_clear (AtomMVHD * mvhd)
+{
+  atom_full_clear (&mvhd->header);
+}
+
+static void
+atom_moov_init (AtomMOOV * moov, AtomsContext * context)
+{
+  atom_header_set (&(moov->header), FOURCC_moov, 0, 0);
+  atom_mvhd_init (&(moov->mvhd));
+  moov->udta = NULL;
+  moov->traks = NULL;
+  moov->context = *context;
+}
+
+AtomMOOV *
+atom_moov_new (AtomsContext * context)
+{
+  AtomMOOV *moov = g_new0 (AtomMOOV, 1);
+
+  atom_moov_init (moov, context);
+  return moov;
+}
+
+void
+atom_moov_free (AtomMOOV * moov)
+{
+  GList *walker;
+
+  atom_clear (&moov->header);
+  atom_mvhd_clear (&moov->mvhd);
+
+  walker = moov->traks;
+  while (walker) {
+    atom_trak_free ((AtomTRAK *) walker->data);
+    walker = g_list_next (walker);
+  }
+  g_list_free (moov->traks);
+  moov->traks = NULL;
+
+  if (moov->udta) {
+    atom_udta_free (moov->udta);
+    moov->udta = NULL;
+  }
+
+  g_free (moov);
+}
+
+/* -- end of init / free -- */
+
+/* -- copy data functions -- */
+
+static guint8
+atom_full_get_version (AtomFull * full)
+{
+  return full->version;
+}
+
+static guint64
+common_time_info_copy_data (TimeInfo * ti, gboolean trunc_to_32,
+    guint8 ** buffer, guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (trunc_to_32) {
+    prop_copy_uint32 ((guint32) ti->creation_time, buffer, size, offset);
+    prop_copy_uint32 ((guint32) ti->modification_time, buffer, size, offset);
+    prop_copy_uint32 (ti->timescale, buffer, size, offset);
+    prop_copy_uint32 ((guint32) ti->duration, buffer, size, offset);
+  } else {
+    prop_copy_uint64 (ti->creation_time, buffer, size, offset);
+    prop_copy_uint64 (ti->modification_time, buffer, size, offset);
+    prop_copy_uint32 (ti->timescale, buffer, size, offset);
+    prop_copy_uint64 (ti->duration, buffer, size, offset);
+  }
+  return *offset - original_offset;
+}
+
+static void
+atom_write_size (guint8 ** buffer, guint64 * size, guint64 * offset,
+    guint64 atom_pos)
+{
+  /* this only works for non-extended atom size, which is OK
+   * (though it could be made to do mem_move, etc and write extended size) */
+  prop_copy_uint32 (*offset - atom_pos, buffer, size, &atom_pos);
+}
+
+guint64
+atom_copy_data (Atom * atom, guint8 ** buffer, guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  /* copies type and size */
+  prop_copy_uint32 (atom->size, buffer, size, offset);
+  prop_copy_fourcc (atom->type, buffer, size, offset);
+
+  /* extended size needed */
+  if (atom->size == 1) {
+    /* really should not happen other than with mdat atom;
+     * would be a problem for size (re)write code, not to mention memory */
+    g_return_val_if_fail (atom->type == FOURCC_mdat, 0);
+    prop_copy_uint64 (atom->extended_size, buffer, size, offset);
+  }
+
+  return *offset - original_offset;
+}
+
+static guint64
+atom_full_copy_data (AtomFull * atom, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&atom->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint8 (atom->version, buffer, size, offset);
+  prop_copy_uint8_array (atom->flags, 3, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_info_list_copy_data (GList * ai, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  while (ai) {
+    AtomInfo *info = (AtomInfo *) ai->data;
+
+    if (!info->copy_data_func (info->atom, buffer, size, offset)) {
+      return 0;
+    }
+    ai = g_list_next (ai);
+  }
+
+  return *offset - original_offset;
+}
+
+static guint64
+atom_data_copy_data (AtomData * data, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&data->header, buffer, size, offset)) {
+    return 0;
+  }
+  if (data->datalen)
+    prop_copy_uint8_array (data->data, data->datalen, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+guint64
+atom_ftyp_copy_data (AtomFTYP * ftyp, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&ftyp->header, buffer, size, offset)) {
+    return 0;
+  }
+  prop_copy_fourcc (ftyp->major_brand, buffer, size, offset);
+  prop_copy_uint32 (ftyp->version, buffer, size, offset);
+
+  prop_copy_fourcc_array (ftyp->compatible_brands, ftyp->compatible_brands_size,
+      buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_mvhd_copy_data (AtomMVHD * atom, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint8 version;
+  guint64 original_offset = *offset;
+
+  if (!atom_full_copy_data (&(atom->header), buffer, size, offset)) {
+    return 0;
+  }
+
+  version = atom_full_get_version (&(atom->header));
+  if (version == 0) {
+    common_time_info_copy_data (&atom->time_info, TRUE, buffer, size, offset);
+  } else if (version == 1) {
+    common_time_info_copy_data (&atom->time_info, FALSE, buffer, size, offset);
+  } else {
+    *offset = original_offset;
+    return 0;
+  }
+
+  prop_copy_uint32 (atom->prefered_rate, buffer, size, offset);
+  prop_copy_uint16 (atom->volume, buffer, size, offset);
+  prop_copy_uint16 (atom->reserved3, buffer, size, offset);
+  prop_copy_uint32_array (atom->reserved4, 2, buffer, size, offset);
+  prop_copy_uint32_array (atom->matrix, 9, buffer, size, offset);
+  prop_copy_uint32 (atom->preview_time, buffer, size, offset);
+  prop_copy_uint32 (atom->preview_duration, buffer, size, offset);
+  prop_copy_uint32 (atom->poster_time, buffer, size, offset);
+  prop_copy_uint32 (atom->selection_time, buffer, size, offset);
+  prop_copy_uint32 (atom->selection_duration, buffer, size, offset);
+  prop_copy_uint32 (atom->current_time, buffer, size, offset);
+
+  prop_copy_uint32 (atom->next_track_id, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_tkhd_copy_data (AtomTKHD * tkhd, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_full_copy_data (&tkhd->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  if (atom_full_get_version (&tkhd->header) == 0) {
+    prop_copy_uint32 ((guint32) tkhd->creation_time, buffer, size, offset);
+    prop_copy_uint32 ((guint32) tkhd->modification_time, buffer, size, offset);
+    prop_copy_uint32 (tkhd->track_ID, buffer, size, offset);
+    prop_copy_uint32 (tkhd->reserved, buffer, size, offset);
+    prop_copy_uint32 ((guint32) tkhd->duration, buffer, size, offset);
+  } else {
+    prop_copy_uint64 (tkhd->creation_time, buffer, size, offset);
+    prop_copy_uint64 (tkhd->modification_time, buffer, size, offset);
+    prop_copy_uint32 (tkhd->track_ID, buffer, size, offset);
+    prop_copy_uint32 (tkhd->reserved, buffer, size, offset);
+    prop_copy_uint64 (tkhd->duration, buffer, size, offset);
+  }
+
+  prop_copy_uint32_array (tkhd->reserved2, 2, buffer, size, offset);
+  prop_copy_uint16 (tkhd->layer, buffer, size, offset);
+  prop_copy_uint16 (tkhd->alternate_group, buffer, size, offset);
+  prop_copy_uint16 (tkhd->volume, buffer, size, offset);
+  prop_copy_uint16 (tkhd->reserved3, buffer, size, offset);
+  prop_copy_uint32_array (tkhd->matrix, 9, buffer, size, offset);
+
+  prop_copy_uint32 (tkhd->width, buffer, size, offset);
+  prop_copy_uint32 (tkhd->height, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_hdlr_copy_data (AtomHDLR * hdlr, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_full_copy_data (&hdlr->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_fourcc (hdlr->component_type, buffer, size, offset);
+  prop_copy_fourcc (hdlr->handler_type, buffer, size, offset);
+  prop_copy_fourcc (hdlr->manufacturer, buffer, size, offset);
+  prop_copy_uint32 (hdlr->flags, buffer, size, offset);
+  prop_copy_uint32 (hdlr->flags_mask, buffer, size, offset);
+
+  prop_copy_null_terminated_string (hdlr->name, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_vmhd_copy_data (AtomVMHD * vmhd, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_full_copy_data (&vmhd->header, buffer, size, offset)) {
+    return 0;
+  }
+  prop_copy_uint16 (vmhd->graphics_mode, buffer, size, offset);
+  prop_copy_uint16_array (vmhd->opcolor, 3, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return original_offset - *offset;
+}
+
+static guint64
+atom_smhd_copy_data (AtomSMHD * smhd, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_full_copy_data (&smhd->header, buffer, size, offset)) {
+    return 0;
+  }
+  prop_copy_uint16 (smhd->balance, buffer, size, offset);
+  prop_copy_uint16 (smhd->reserved, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return original_offset - *offset;
+}
+
+static guint64
+atom_hmhd_copy_data (AtomHMHD * hmhd, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_full_copy_data (&hmhd->header, buffer, size, offset)) {
+    return 0;
+  }
+  prop_copy_uint16 (hmhd->max_pdu_size, buffer, size, offset);
+  prop_copy_uint16 (hmhd->avg_pdu_size, buffer, size, offset);
+  prop_copy_uint32 (hmhd->max_bitrate, buffer, size, offset);
+  prop_copy_uint32 (hmhd->avg_bitrate, buffer, size, offset);
+  prop_copy_uint32 (hmhd->sliding_avg_bitrate, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return original_offset - *offset;
+}
+
+static gboolean
+atom_url_same_file_flag (AtomURL * url)
+{
+  return (url->header.flags[2] & 0x1) == 1;
+}
+
+static guint64
+atom_url_copy_data (AtomURL * url, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_full_copy_data (&url->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  if (!atom_url_same_file_flag (url)) {
+    prop_copy_null_terminated_string (url->location, buffer, size, offset);
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return original_offset - *offset;
+}
+
+static guint64
+atom_stts_copy_data (AtomSTTS * stts, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+  GList *walker;
+
+  if (!atom_full_copy_data (&stts->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint32 (stts->n_entries, buffer, size, offset);
+  /* minimize realloc */
+  prop_copy_ensure_buffer (buffer, size, offset, 8 * stts->n_entries);
+  for (walker = g_list_last (stts->entries); walker != NULL;
+      walker = g_list_previous (walker)) {
+    STTSEntry *entry = (STTSEntry *) walker->data;
+
+    prop_copy_uint32 (entry->sample_count, buffer, size, offset);
+    prop_copy_int32 (entry->sample_delta, buffer, size, offset);
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_sample_entry_copy_data (SampleTableEntry * se, guint8 ** buffer,
+    guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&se->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint8_array (se->reserved, 6, buffer, size, offset);
+  prop_copy_uint16 (se->data_reference_index, buffer, size, offset);
+
+  return *offset - original_offset;
+}
+
+static guint64
+atom_esds_copy_data (AtomESDS * esds, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_full_copy_data (&esds->header, buffer, size, offset)) {
+    return 0;
+  }
+  if (!desc_es_descriptor_copy_data (&esds->es, buffer, size, offset)) {
+    return 0;
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_frma_copy_data (AtomFRMA * frma, guint8 ** buffer,
+    guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&(frma->header), buffer, size, offset))
+    return 0;
+
+  prop_copy_fourcc (frma->media_type, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_mp4s_copy_data (SampleTableEntryMP4S * mp4s, guint8 ** buffer,
+    guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_sample_entry_copy_data (&mp4s->se, buffer, size, offset)) {
+    return 0;
+  }
+  if (!atom_esds_copy_data (&mp4s->es, buffer, size, offset)) {
+    return 0;
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_hint_sample_entry_copy_data (AtomHintSampleEntry * hse, guint8 ** buffer,
+    guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_sample_entry_copy_data (&hse->se, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint32 (hse->size, buffer, size, offset);
+  prop_copy_uint8_array (hse->data, hse->size, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+sample_entry_mp4a_copy_data (SampleTableEntryMP4A * mp4a, guint8 ** buffer,
+    guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_sample_entry_copy_data (&mp4a->se, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint16 (mp4a->version, buffer, size, offset);
+  prop_copy_uint16 (mp4a->revision_level, buffer, size, offset);
+  prop_copy_uint32 (mp4a->vendor, buffer, size, offset);
+  prop_copy_uint16 (mp4a->channels, buffer, size, offset);
+  prop_copy_uint16 (mp4a->sample_size, buffer, size, offset);
+  prop_copy_uint16 (mp4a->compression_id, buffer, size, offset);
+  prop_copy_uint16 (mp4a->packet_size, buffer, size, offset);
+  prop_copy_uint32 (mp4a->sample_rate, buffer, size, offset);
+
+  /* this should always be 0 for mp4 flavor */
+  if (mp4a->version == 1) {
+    prop_copy_uint32 (mp4a->samples_per_packet, buffer, size, offset);
+    prop_copy_uint32 (mp4a->bytes_per_packet, buffer, size, offset);
+    prop_copy_uint32 (mp4a->bytes_per_frame, buffer, size, offset);
+    prop_copy_uint32 (mp4a->bytes_per_sample, buffer, size, offset);
+  }
+
+  if (mp4a->extension_atoms) {
+    if (!atom_info_list_copy_data (mp4a->extension_atoms, buffer, size, offset))
+      return 0;
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+sample_entry_mp4v_copy_data (SampleTableEntryMP4V * mp4v, guint8 ** buffer,
+    guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_sample_entry_copy_data (&mp4v->se, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint16 (mp4v->version, buffer, size, offset);
+  prop_copy_uint16 (mp4v->revision_level, buffer, size, offset);
+  prop_copy_fourcc (mp4v->vendor, buffer, size, offset);
+  prop_copy_uint32 (mp4v->temporal_quality, buffer, size, offset);
+  prop_copy_uint32 (mp4v->spatial_quality, buffer, size, offset);
+
+  prop_copy_uint16 (mp4v->width, buffer, size, offset);
+  prop_copy_uint16 (mp4v->height, buffer, size, offset);
+
+  prop_copy_uint32 (mp4v->horizontal_resolution, buffer, size, offset);
+  prop_copy_uint32 (mp4v->vertical_resolution, buffer, size, offset);
+  prop_copy_uint32 (mp4v->datasize, buffer, size, offset);
+
+  prop_copy_uint16 (mp4v->frame_count, buffer, size, offset);
+
+  prop_copy_fixed_size_string ((guint8 *) mp4v->compressor, 32, buffer, size,
+      offset);
+
+  prop_copy_uint16 (mp4v->depth, buffer, size, offset);
+  prop_copy_uint16 (mp4v->color_table_id, buffer, size, offset);
+
+  /* extra atoms */
+  if (mp4v->extension_atoms &&
+      !atom_info_list_copy_data (mp4v->extension_atoms, buffer, size, offset))
+    return 0;
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_stsz_copy_data (AtomSTSZ * stsz, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+  GList *walker;
+
+  if (!atom_full_copy_data (&stsz->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint32 (stsz->sample_size, buffer, size, offset);
+  prop_copy_uint32 (stsz->table_size, buffer, size, offset);
+  /* minimize realloc */
+  prop_copy_ensure_buffer (buffer, size, offset, 4 * stsz->table_size);
+  if (stsz->sample_size == 0) {
+    for (walker = g_list_last (stsz->entries); walker != NULL;
+        walker = g_list_previous (walker)) {
+      prop_copy_uint32 ((guint32) GPOINTER_TO_UINT (walker->data), buffer, size,
+          offset);
+    }
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_stsc_copy_data (AtomSTSC * stsc, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+  GList *walker;
+
+  if (!atom_full_copy_data (&stsc->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint32 (stsc->n_entries, buffer, size, offset);
+  /* minimize realloc */
+  prop_copy_ensure_buffer (buffer, size, offset, 12 * stsc->n_entries);
+
+  for (walker = g_list_last (stsc->entries); walker != NULL;
+      walker = g_list_previous (walker)) {
+    STSCEntry *entry = (STSCEntry *) walker->data;
+
+    prop_copy_uint32 (entry->first_chunk, buffer, size, offset);
+    prop_copy_uint32 (entry->samples_per_chunk, buffer, size, offset);
+    prop_copy_uint32 (entry->sample_description_index, buffer, size, offset);
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_ctts_copy_data (AtomCTTS * ctts, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+  GList *walker;
+
+  if (!atom_full_copy_data (&ctts->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint32 (ctts->n_entries, buffer, size, offset);
+  /* minimize realloc */
+  prop_copy_ensure_buffer (buffer, size, offset, 8 * ctts->n_entries);
+  for (walker = g_list_last (ctts->entries); walker != NULL;
+      walker = g_list_previous (walker)) {
+    CTTSEntry *entry = (CTTSEntry *) walker->data;
+
+    prop_copy_uint32 (entry->samplecount, buffer, size, offset);
+    prop_copy_uint32 (entry->sampleoffset, buffer, size, offset);
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_stco64_copy_data (AtomSTCO64 * stco64, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+  GList *walker;
+  gboolean trunc_to_32 = stco64->header.header.type == FOURCC_stco;
+
+  if (!atom_full_copy_data (&stco64->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint32 (stco64->n_entries, buffer, size, offset);
+
+  /* minimize realloc */
+  prop_copy_ensure_buffer (buffer, size, offset, 8 * stco64->n_entries);
+  for (walker = g_list_last (stco64->entries); walker != NULL;
+      walker = g_list_previous (walker)) {
+    guint64 *value = (guint64 *) walker->data;
+
+    if (trunc_to_32) {
+      prop_copy_uint32 ((guint32) * value, buffer, size, offset);
+    } else {
+      prop_copy_uint64 (*value, buffer, size, offset);
+    }
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_stss_copy_data (AtomSTSS * stss, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+  GList *walker;
+
+  if (stss->entries == NULL) {
+    /* FIXME not needing this atom might be confused with error while copying */
+    return 0;
+  }
+
+  if (!atom_full_copy_data (&stss->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint32 (stss->n_entries, buffer, size, offset);
+  /* minimize realloc */
+  prop_copy_ensure_buffer (buffer, size, offset, 4 * stss->n_entries);
+  for (walker = g_list_last (stss->entries); walker != NULL;
+      walker = g_list_previous (walker)) {
+    prop_copy_uint32 ((guint32) GPOINTER_TO_UINT (walker->data), buffer, size,
+        offset);
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_stsd_copy_data (AtomSTSD * stsd, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+  GList *walker;
+
+  if (!atom_full_copy_data (&stsd->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint32 (stsd->n_entries, buffer, size, offset);
+
+  for (walker = g_list_last (stsd->entries); walker != NULL;
+      walker = g_list_previous (walker)) {
+    SampleTableEntry *se = (SampleTableEntry *) walker->data;
+
+    switch (((Atom *) walker->data)->type) {
+      case FOURCC_mp4a:
+        if (!sample_entry_mp4a_copy_data ((SampleTableEntryMP4A *) walker->data,
+                buffer, size, offset)) {
+          return 0;
+        }
+        break;
+      case FOURCC_mp4s:
+        if (!atom_mp4s_copy_data ((SampleTableEntryMP4S *) walker->data,
+                buffer, size, offset)) {
+          return 0;
+        }
+        break;
+      case FOURCC_mp4v:
+        if (!sample_entry_mp4v_copy_data ((SampleTableEntryMP4V *) walker->data,
+                buffer, size, offset)) {
+          return 0;
+        }
+        break;
+      default:
+        if (se->kind == VIDEO) {
+          size += sample_entry_mp4v_copy_data ((SampleTableEntryMP4V *)
+              walker->data, buffer, size, offset);
+        } else if (se->kind == AUDIO) {
+          size += sample_entry_mp4a_copy_data ((SampleTableEntryMP4A *)
+              walker->data, buffer, size, offset);
+        } else {
+          if (!atom_hint_sample_entry_copy_data (
+                  (AtomHintSampleEntry *) walker->data, buffer, size, offset)) {
+            return 0;
+          }
+        }
+        break;
+    }
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_stbl_copy_data (AtomSTBL * stbl, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&stbl->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  if (!atom_stsd_copy_data (&stbl->stsd, buffer, size, offset)) {
+    return 0;
+  }
+  if (!atom_stts_copy_data (&stbl->stts, buffer, size, offset)) {
+    return 0;
+  }
+  /* this atom is optional, so let's check if we need it
+   * (to avoid false error) */
+  if (stbl->stss.entries) {
+    if (!atom_stss_copy_data (&stbl->stss, buffer, size, offset)) {
+      return 0;
+    }
+  }
+
+  if (!atom_stsc_copy_data (&stbl->stsc, buffer, size, offset)) {
+    return 0;
+  }
+  if (!atom_stsz_copy_data (&stbl->stsz, buffer, size, offset)) {
+    return 0;
+  }
+  if (stbl->ctts) {
+    if (!atom_ctts_copy_data (stbl->ctts, buffer, size, offset)) {
+      return 0;
+    }
+  }
+  if (!atom_stco64_copy_data (&stbl->stco64, buffer, size, offset)) {
+    return 0;
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return original_offset - *offset;
+}
+
+
+static guint64
+atom_dref_copy_data (AtomDREF * dref, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+  GList *walker;
+
+  if (!atom_full_copy_data (&dref->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint32 (g_list_length (dref->entries), buffer, size, offset);
+
+  walker = dref->entries;
+  while (walker != NULL) {
+    Atom *atom = (Atom *) walker->data;
+
+    if (atom->type == FOURCC_url_) {
+      atom_url_copy_data ((AtomURL *) atom, buffer, size, offset);
+    } else if (atom->type == FOURCC_alis) {
+      atom_full_copy_data ((AtomFull *) atom, buffer, size, offset);
+    } else {
+      g_error ("Unsupported atom used inside dref atom");
+    }
+    walker = g_list_next (walker);
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_dinf_copy_data (AtomDINF * dinf, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&dinf->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  if (!atom_dref_copy_data (&dinf->dref, buffer, size, offset)) {
+    return 0;
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return original_offset - *offset;
+}
+
+static guint64
+atom_minf_copy_data (AtomMINF * minf, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&minf->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  if (minf->vmhd) {
+    if (!atom_vmhd_copy_data (minf->vmhd, buffer, size, offset)) {
+      return 0;
+    }
+  } else if (minf->smhd) {
+    if (!atom_smhd_copy_data (minf->smhd, buffer, size, offset)) {
+      return 0;
+    }
+  } else if (minf->hmhd) {
+    if (!atom_hmhd_copy_data (minf->hmhd, buffer, size, offset)) {
+      return 0;
+    }
+  }
+
+  if (minf->hdlr) {
+    if (!atom_hdlr_copy_data (minf->hdlr, buffer, size, offset)) {
+      return 0;
+    }
+  }
+
+  if (!atom_dinf_copy_data (&minf->dinf, buffer, size, offset)) {
+    return 0;
+  }
+  if (!atom_stbl_copy_data (&minf->stbl, buffer, size, offset)) {
+    return 0;
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_mdhd_copy_data (AtomMDHD * mdhd, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_full_copy_data (&mdhd->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  if (!common_time_info_copy_data (&mdhd->time_info,
+          atom_full_get_version (&mdhd->header) == 0, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint16 (mdhd->language_code, buffer, size, offset);
+  prop_copy_uint16 (mdhd->quality, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_mdia_copy_data (AtomMDIA * mdia, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&mdia->header, buffer, size, offset)) {
+    return 0;
+  }
+  if (!atom_mdhd_copy_data (&mdia->mdhd, buffer, size, offset)) {
+    return 0;
+  }
+  if (!atom_hdlr_copy_data (&mdia->hdlr, buffer, size, offset)) {
+    return 0;
+  }
+
+  if (!atom_minf_copy_data (&mdia->minf, buffer, size, offset)) {
+    return 0;
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_trak_copy_data (AtomTRAK * trak, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&trak->header, buffer, size, offset)) {
+    return 0;
+  }
+  if (!atom_tkhd_copy_data (&trak->tkhd, buffer, size, offset)) {
+    return 0;
+  }
+
+  if (!atom_mdia_copy_data (&trak->mdia, buffer, size, offset)) {
+    return 0;
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_tag_data_copy_data (AtomTagData * data, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_full_copy_data (&data->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint32 (data->reserved, buffer, size, offset);
+  prop_copy_uint8_array (data->data, data->datalen, buffer, size, offset);
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_tag_copy_data (AtomTag * tag, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&tag->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  if (!atom_tag_data_copy_data (&tag->data, buffer, size, offset)) {
+    return 0;
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_ilst_copy_data (AtomILST * ilst, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&ilst->header, buffer, size, offset)) {
+    return 0;
+  }
+  /* extra atoms */
+  if (ilst->entries &&
+      !atom_info_list_copy_data (ilst->entries, buffer, size, offset))
+    return 0;
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_meta_copy_data (AtomMETA * meta, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_full_copy_data (&meta->header, buffer, size, offset)) {
+    return 0;
+  }
+  if (!atom_hdlr_copy_data (&meta->hdlr, buffer, size, offset)) {
+    return 0;
+  }
+  if (meta->ilst) {
+    if (!atom_ilst_copy_data (meta->ilst, buffer, size, offset)) {
+      return 0;
+    }
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_udta_copy_data (AtomUDTA * udta, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&udta->header, buffer, size, offset)) {
+    return 0;
+  }
+  if (udta->meta) {
+    if (!atom_meta_copy_data (udta->meta, buffer, size, offset)) {
+      return 0;
+    }
+  } else if (udta->entries) {
+    /* extra atoms */
+    if (!atom_info_list_copy_data (udta->entries, buffer, size, offset))
+      return 0;
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+guint64
+atom_moov_copy_data (AtomMOOV * atom, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+  GList *walker;
+
+  if (!atom_copy_data (&(atom->header), buffer, size, offset))
+    return 0;
+
+  if (!atom_mvhd_copy_data (&(atom->mvhd), buffer, size, offset))
+    return 0;
+
+  walker = g_list_first (atom->traks);
+  while (walker != NULL) {
+    if (!atom_trak_copy_data ((AtomTRAK *) walker->data, buffer, size, offset)) {
+      return 0;
+    }
+    walker = g_list_next (walker);
+  }
+
+  if (atom->udta) {
+    if (!atom_udta_copy_data (atom->udta, buffer, size, offset)) {
+      return 0;
+    }
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_wave_copy_data (AtomWAVE * wave, guint8 ** buffer,
+    guint64 * size, guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&(wave->header), buffer, size, offset))
+    return 0;
+
+  if (wave->extension_atoms) {
+    if (!atom_info_list_copy_data (wave->extension_atoms, buffer, size, offset))
+      return 0;
+  }
+
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+/* -- end of copy data functions -- */
+
+/* -- general functions, API and support functions */
+
+/* add samples to tables */
+
+static STSCEntry *
+stsc_entry_new (guint32 first_chunk, guint32 samples, guint32 desc_index)
+{
+  STSCEntry *entry = g_new0 (STSCEntry, 1);
+
+  entry->first_chunk = first_chunk;
+  entry->samples_per_chunk = samples;
+  entry->sample_description_index = desc_index;
+  return entry;
+}
+
+static void
+atom_stsc_add_new_entry (AtomSTSC * stsc, guint32 first_chunk, guint32 nsamples)
+{
+  if (stsc->entries &&
+      ((STSCEntry *) stsc->entries->data)->samples_per_chunk == nsamples)
+    return;
+
+  stsc->entries =
+      g_list_prepend (stsc->entries, stsc_entry_new (first_chunk, nsamples, 1));
+  stsc->n_entries++;
+}
+
+static STTSEntry *
+stts_entry_new (guint32 sample_count, gint32 sample_delta)
+{
+  STTSEntry *entry = g_new0 (STTSEntry, 1);
+
+  entry->sample_count = sample_count;
+  entry->sample_delta = sample_delta;
+  return entry;
+}
+
+static void
+atom_stts_add_entry (AtomSTTS * stts, guint32 sample_count, gint32 sample_delta)
+{
+  STTSEntry *entry;
+
+  if (stts->entries == NULL) {
+    stts->entries =
+        g_list_prepend (stts->entries, stts_entry_new (sample_count,
+            sample_delta));
+    stts->n_entries++;
+    return;
+  }
+  entry = (STTSEntry *) g_list_first (stts->entries)->data;
+  if (entry->sample_delta == sample_delta) {
+    entry->sample_count += sample_count;
+  } else {
+    stts->entries =
+        g_list_prepend (stts->entries, stts_entry_new (sample_count,
+            sample_delta));
+    stts->n_entries++;
+  }
+}
+
+static void
+atom_stsz_add_entry (AtomSTSZ * stsz, guint32 nsamples, guint32 size)
+{
+  guint32 i;
+
+  stsz->table_size += nsamples;
+  if (stsz->sample_size != 0) {
+    /* it is constant size, we don't need entries */
+    return;
+  }
+  for (i = 0; i < nsamples; i++) {
+    stsz->entries = g_list_prepend (stsz->entries, GUINT_TO_POINTER (size));
+  }
+}
+
+static guint32
+atom_stco64_get_entry_count (AtomSTCO64 * stco64)
+{
+  return stco64->n_entries;
+}
+
+static void
+atom_stco64_add_entry (AtomSTCO64 * stco64, guint64 entry)
+{
+  guint64 *pont = g_new (guint64, 1);
+
+  *pont = entry;
+  stco64->entries = g_list_prepend (stco64->entries, pont);
+  stco64->n_entries++;
+}
+
+static void
+atom_stss_add_entry (AtomSTSS * stss, guint32 sample)
+{
+  stss->entries = g_list_prepend (stss->entries, GUINT_TO_POINTER (sample));
+  stss->n_entries++;
+}
+
+static void
+atom_stbl_add_stss_entry (AtomSTBL * stbl)
+{
+  guint32 sample_index = stbl->stsz.table_size;
+
+  atom_stss_add_entry (&stbl->stss, sample_index);
+}
+
+static void
+atom_ctts_add_entry (AtomCTTS * ctts, guint32 nsamples, guint32 offset)
+{
+  GList *walker;
+  CTTSEntry *entry;
+
+  walker = g_list_first (ctts->entries);
+  entry = (walker == NULL) ? NULL : (CTTSEntry *) walker->data;
+
+  if (entry == NULL || entry->sampleoffset != offset) {
+    CTTSEntry *entry = g_new0 (CTTSEntry, 1);
+
+    entry->samplecount = nsamples;
+    entry->sampleoffset = offset;
+    ctts->entries = g_list_prepend (ctts->entries, entry);
+    ctts->n_entries++;
+  } else {
+    entry->samplecount += nsamples;
+  }
+}
+
+static void
+atom_stbl_add_ctts_entry (AtomSTBL * stbl, guint32 nsamples, guint32 offset)
+{
+  if (stbl->ctts == NULL) {
+    stbl->ctts = atom_ctts_new ();
+  }
+  atom_ctts_add_entry (stbl->ctts, nsamples, offset);
+}
+
+void
+atom_trak_add_samples (AtomTRAK * trak, guint32 nsamples, guint32 delta,
+    guint32 size, guint64 chunk_offset, gboolean sync,
+    gboolean do_pts, gint64 pts_offset)
+{
+  AtomSTBL *stbl = &trak->mdia.minf.stbl;
+
+  atom_stts_add_entry (&stbl->stts, nsamples, delta);
+  atom_stsz_add_entry (&stbl->stsz, nsamples, size);
+  atom_stco64_add_entry (&stbl->stco64, chunk_offset);
+  atom_stsc_add_new_entry (&stbl->stsc,
+      atom_stco64_get_entry_count (&stbl->stco64), nsamples);
+  if (sync)
+    atom_stbl_add_stss_entry (stbl);
+  if (do_pts)
+    atom_stbl_add_ctts_entry (stbl, nsamples, pts_offset);
+}
+
+/* trak and moov molding */
+
+guint32
+atom_trak_get_timescale (AtomTRAK * trak)
+{
+  return trak->mdia.mdhd.time_info.timescale;
+}
+
+static void
+atom_trak_set_id (AtomTRAK * trak, guint32 id)
+{
+  trak->tkhd.track_ID = id;
+}
+
+void
+atom_moov_add_trak (AtomMOOV * moov, AtomTRAK * trak)
+{
+  atom_trak_set_id (trak, moov->mvhd.next_track_id++);
+  moov->traks = g_list_append (moov->traks, trak);
+}
+
+static guint64
+atom_trak_get_duration (AtomTRAK * trak)
+{
+  return trak->tkhd.duration;
+}
+
+static guint64
+atom_stts_get_total_duration (AtomSTTS * stts)
+{
+  GList *walker = stts->entries;
+  guint64 sum = 0;
+
+  while (walker) {
+    STTSEntry *entry = (STTSEntry *) walker->data;
+
+    sum += (guint64) (entry->sample_count) * entry->sample_delta;
+    walker = g_list_next (walker);
+  }
+  return sum;
+}
+
+static void
+atom_trak_update_duration (AtomTRAK * trak, guint64 moov_timescale)
+{
+  trak->mdia.mdhd.time_info.duration =
+      atom_stts_get_total_duration (&trak->mdia.minf.stbl.stts);
+  if (trak->mdia.mdhd.time_info.timescale != 0) {
+    trak->tkhd.duration =
+        gst_util_uint64_scale (trak->mdia.mdhd.time_info.duration,
+        moov_timescale, trak->mdia.mdhd.time_info.timescale);
+  } else {
+    trak->tkhd.duration = 0;
+  }
+}
+
+static guint32
+atom_moov_get_timescale (AtomMOOV * moov)
+{
+  return moov->mvhd.time_info.timescale;
+}
+
+void
+atom_moov_update_timescale (AtomMOOV * moov, guint32 timescale)
+{
+  moov->mvhd.time_info.timescale = timescale;
+}
+
+void
+atom_moov_update_duration (AtomMOOV * moov)
+{
+  GList *traks = moov->traks;
+  guint64 dur, duration = 0;
+
+  while (traks) {
+    AtomTRAK *trak = (AtomTRAK *) traks->data;
+
+    atom_trak_update_duration (trak, atom_moov_get_timescale (moov));
+    dur = atom_trak_get_duration (trak);
+    if (dur > duration)
+      duration = dur;
+    traks = g_list_next (traks);
+  }
+  moov->mvhd.time_info.duration = duration;
+}
+
+static void
+atom_set_type (Atom * atom, guint32 fourcc)
+{
+  atom->type = fourcc;
+}
+
+static void
+atom_stbl_set_64bits (AtomSTBL * stbl, gboolean use)
+{
+  if (use) {
+    atom_set_type (&stbl->stco64.header.header, FOURCC_co64);
+  } else {
+    atom_set_type (&stbl->stco64.header.header, FOURCC_stco);
+  }
+}
+
+static void
+atom_trak_set_64bits (AtomTRAK * trak, gboolean use)
+{
+  atom_stbl_set_64bits (&trak->mdia.minf.stbl, use);
+}
+
+void
+atom_moov_set_64bits (AtomMOOV * moov, gboolean large_file)
+{
+  GList *traks = moov->traks;
+
+  while (traks) {
+    AtomTRAK *trak = (AtomTRAK *) traks->data;
+
+    atom_trak_set_64bits (trak, large_file);
+    traks = g_list_next (traks);
+  }
+}
+
+static void
+atom_stco64_chunks_add_offset (AtomSTCO64 * stco64, guint32 offset)
+{
+  GList *entries = stco64->entries;
+
+  while (entries) {
+    guint64 *value = (guint64 *) entries->data;
+
+    *value += offset;
+    entries = g_list_next (entries);
+  }
+}
+
+void
+atom_moov_chunks_add_offset (AtomMOOV * moov, guint32 offset)
+{
+  GList *traks = moov->traks;
+
+  while (traks) {
+    AtomTRAK *trak = (AtomTRAK *) traks->data;
+
+    atom_stco64_chunks_add_offset (&trak->mdia.minf.stbl.stco64, offset);
+    traks = g_list_next (traks);
+  }
+}
+
+/*
+ * Meta tags functions
+ */
+static void
+atom_moov_init_metatags (AtomMOOV * moov, AtomsContext * context)
+{
+  if (!moov->udta) {
+    moov->udta = atom_udta_new ();
+  }
+  if (context->flavor != ATOMS_TREE_FLAVOR_3GP) {
+    if (!moov->udta->meta) {
+      moov->udta->meta = atom_meta_new ();
+    }
+    if (!moov->udta->meta->ilst) {
+      moov->udta->meta->ilst = atom_ilst_new ();
+    }
+  }
+}
+
+static void
+atom_tag_data_alloc_data (AtomTagData * data, guint size)
+{
+  if (data->data != NULL) {
+    g_free (data->data);
+  }
+  data->data = g_new0 (guint8, size);
+  data->datalen = size;
+}
+
+static void
+atom_moov_append_tag (AtomMOOV * moov, AtomInfo * tag)
+{
+  GList **entries;
+
+  atom_moov_init_metatags (moov, &moov->context);
+  if (moov->udta->meta)
+    entries = &moov->udta->meta->ilst->entries;
+  else
+    entries = &moov->udta->entries;
+  *entries = g_list_append (*entries, tag);
+}
+
+void
+atom_moov_add_tag (AtomMOOV * moov, guint32 fourcc, guint32 flags,
+    const guint8 * data, guint size)
+{
+  AtomTag *tag;
+  AtomTagData *tdata;
+
+  tag = atom_tag_new (fourcc, flags);
+  tdata = &tag->data;
+  atom_tag_data_alloc_data (tdata, size);
+  g_memmove (tdata->data, data, size);
+
+  atom_moov_append_tag (moov,
+      build_atom_info_wrapper ((Atom *) tag, (gpointer)atom_tag_copy_data,
+              (gpointer)atom_tag_free));
+}
+
+void
+atom_moov_add_str_tag (AtomMOOV * moov, guint32 fourcc, const gchar * value)
+{
+  gint len = strlen (value);
+
+  if (len > 0)
+    atom_moov_add_tag (moov, fourcc, METADATA_TEXT_FLAG, (guint8 *) value, len);
+}
+
+void
+atom_moov_add_uint_tag (AtomMOOV * moov, guint32 fourcc, guint32 flags,
+    guint32 value)
+{
+  guint8 data[8] = { 0, };
+
+  if (flags) {
+    GST_WRITE_UINT16_BE (data, value);
+    atom_moov_add_tag (moov, fourcc, flags, data, 2);
+  } else {
+    GST_WRITE_UINT32_BE (data + 2, value);
+    atom_moov_add_tag (moov, fourcc, flags, data, 8);
+  }
+}
+
+void
+atom_moov_add_blob_tag (AtomMOOV * moov, guint8 * data, guint size)
+{
+  AtomData *data_atom;
+  GstBuffer *buf;
+  guint len;
+  guint32 fourcc;
+
+  if (size < 8)
+    return;
+
+  /* blob is unparsed atom;
+   * extract size and fourcc, and wrap remainder in data atom */
+  len = GST_READ_UINT32_BE (data);
+  fourcc = GST_READ_UINT32_LE (data + 4);
+  if (len > size)
+    return;
+
+  buf = gst_buffer_new ();
+  GST_BUFFER_SIZE (buf) = len - 8;
+  GST_BUFFER_DATA (buf) = data + 8;
+
+  data_atom = atom_data_new_from_gst_buffer (fourcc, buf);
+  gst_buffer_unref (buf);
+
+  atom_moov_append_tag (moov,
+      build_atom_info_wrapper ((Atom *) data_atom, (gpointer)atom_data_copy_data,
+              (gpointer)atom_data_free));
+}
+
+void
+atom_moov_add_3gp_tag (AtomMOOV * moov, guint32 fourcc, guint8 * data,
+    guint size)
+{
+  AtomData *data_atom;
+  GstBuffer *buf;
+  guint8 *bdata;
+
+  /* need full atom */
+  buf = gst_buffer_new_and_alloc (size + 4);
+  bdata = GST_BUFFER_DATA (buf);
+  /* full atom: version and flags */
+  GST_WRITE_UINT32_BE (bdata, 0);
+  memcpy (bdata + 4, data, size);
+
+  data_atom = atom_data_new_from_gst_buffer (fourcc, buf);
+  gst_buffer_unref (buf);
+
+  atom_moov_append_tag (moov,
+      build_atom_info_wrapper ((Atom *) data_atom, (gpointer)atom_data_copy_data,
+              (gpointer)atom_data_free));
+}
+
+guint16
+language_code (const char *lang)
+{
+  g_return_val_if_fail (lang != NULL, 0);
+  g_return_val_if_fail (strlen (lang) == 3, 0);
+
+  return (((lang[0] - 0x60) & 0x1F) << 10) + (((lang[1] - 0x60) & 0x1F) << 5) +
+      ((lang[2] - 0x60) & 0x1F);
+}
+
+void
+atom_moov_add_3gp_str_int_tag (AtomMOOV * moov, guint32 fourcc,
+    const gchar * value, gint16 ivalue)
+{
+  gint len = 0, size = 0;
+  guint8 *data;
+
+  if (value) {
+    len = strlen (value);
+    size = len + 3;
+  }
+
+  if (ivalue >= 0)
+    size += 2;
+
+  data = g_malloc (size + 3);
+  /* language tag and null-terminated UTF-8 string */
+  if (value) {
+    GST_WRITE_UINT16_BE (data, language_code (GST_QT_MUX_DEFAULT_TAG_LANGUAGE));
+    /* include 0 terminator */
+    memcpy (data + 2, value, len + 1);
+  }
+  /* 16-bit unsigned int if standalone, otherwise 8-bit */
+  if (ivalue >= 0) {
+    if (size == 2)
+      GST_WRITE_UINT16_BE (data + size - 2, ivalue);
+    else {
+      GST_WRITE_UINT8 (data + size - 2, ivalue & 0xFF);
+      size--;
+    }
+  }
+
+  atom_moov_add_3gp_tag (moov, fourcc, data, size);
+  g_free (data);
+}
+
+void
+atom_moov_add_3gp_str_tag (AtomMOOV * moov, guint32 fourcc, const gchar * value)
+{
+  atom_moov_add_3gp_str_int_tag (moov, fourcc, value, -1);
+}
+
+void
+atom_moov_add_3gp_uint_tag (AtomMOOV * moov, guint32 fourcc, guint16 value)
+{
+  atom_moov_add_3gp_str_int_tag (moov, fourcc, NULL, value);
+}
+
+/*
+ * Functions for specifying media types
+ */
+
+static void
+atom_minf_set_audio (AtomMINF * minf)
+{
+  atom_minf_clear_handlers (minf);
+  minf->smhd = atom_smhd_new ();
+}
+
+static void
+atom_minf_set_video (AtomMINF * minf, AtomsContext * context)
+{
+  atom_minf_clear_handlers (minf);
+  minf->vmhd = atom_vmhd_new (context);
+}
+
+static void
+atom_hdlr_set_type (AtomHDLR * hdlr, AtomsContext * context, guint32 comp_type,
+    guint32 hdlr_type)
+{
+  if (context->flavor == ATOMS_TREE_FLAVOR_MOV) {
+    hdlr->component_type = comp_type;
+  }
+  hdlr->handler_type = hdlr_type;
+}
+
+static void
+atom_mdia_set_hdlr_type_audio (AtomMDIA * mdia, AtomsContext * context)
+{
+  atom_hdlr_set_type (&mdia->hdlr, context, FOURCC_mhlr, FOURCC_soun);
+}
+
+static void
+atom_mdia_set_hdlr_type_video (AtomMDIA * mdia, AtomsContext * context)
+{
+  atom_hdlr_set_type (&mdia->hdlr, context, FOURCC_mhlr, FOURCC_vide);
+}
+
+static void
+atom_mdia_set_audio (AtomMDIA * mdia, AtomsContext * context)
+{
+  atom_mdia_set_hdlr_type_audio (mdia, context);
+  atom_minf_set_audio (&mdia->minf);
+}
+
+static void
+atom_mdia_set_video (AtomMDIA * mdia, AtomsContext * context)
+{
+  atom_mdia_set_hdlr_type_video (mdia, context);
+  atom_minf_set_video (&mdia->minf, context);
+}
+
+static void
+atom_tkhd_set_audio (AtomTKHD * tkhd)
+{
+  tkhd->volume = 0x0100;
+  tkhd->width = tkhd->height = 0;
+}
+
+static void
+atom_tkhd_set_video (AtomTKHD * tkhd, AtomsContext * context, guint32 width,
+    guint32 height)
+{
+  tkhd->volume = 0;
+
+  /* qt and ISO base media do not contradict, and examples agree */
+  tkhd->width = width;
+  tkhd->height = height;
+}
+
+/* re-negotiation is prevented at top-level, so only 1 entry expected.
+ * Quite some more care here and elsewhere may be needed to
+ * support several entries */
+static SampleTableEntryMP4A *
+atom_trak_add_audio_entry (AtomTRAK * trak, AtomsContext * context,
+    guint32 type)
+{
+  AtomSTSD *stsd = &trak->mdia.minf.stbl.stsd;
+  SampleTableEntryMP4A *mp4a = sample_entry_mp4a_new ();
+
+  mp4a->se.header.type = type;
+  mp4a->se.kind = AUDIO;
+  mp4a->compression_id = -1;
+  mp4a->se.data_reference_index = 1;
+
+  stsd->entries = g_list_prepend (stsd->entries, mp4a);
+  stsd->n_entries++;
+  return mp4a;
+}
+
+static SampleTableEntryMP4V *
+atom_trak_add_video_entry (AtomTRAK * trak, AtomsContext * context,
+    guint32 type)
+{
+  SampleTableEntryMP4V *mp4v = sample_entry_mp4v_new (context);
+  AtomSTSD *stsd = &trak->mdia.minf.stbl.stsd;
+
+  mp4v->se.header.type = type;
+  mp4v->se.kind = VIDEO;
+  mp4v->se.data_reference_index = 1;
+  mp4v->horizontal_resolution = 72 << 16;
+  mp4v->vertical_resolution = 72 << 16;
+  if (context->flavor == ATOMS_TREE_FLAVOR_MOV) {
+    mp4v->spatial_quality = 512;
+    mp4v->temporal_quality = 512;
+  }
+
+  stsd->entries = g_list_prepend (stsd->entries, mp4v);
+  stsd->n_entries++;
+  return mp4v;
+}
+
+static void
+atom_trak_set_constant_size_samples (AtomTRAK * trak, guint32 sample_size)
+{
+  trak->mdia.minf.stbl.stsz.sample_size = sample_size;
+}
+
+static void
+atom_trak_set_audio (AtomTRAK * trak, AtomsContext * context)
+{
+  atom_tkhd_set_audio (&trak->tkhd);
+  atom_mdia_set_audio (&trak->mdia, context);
+}
+
+static void
+atom_trak_set_video (AtomTRAK * trak, AtomsContext * context, guint32 width,
+    guint32 height)
+{
+  atom_tkhd_set_video (&trak->tkhd, context, width, height);
+  atom_mdia_set_video (&trak->mdia, context);
+}
+
+static void
+atom_trak_set_audio_commons (AtomTRAK * trak, AtomsContext * context,
+    guint32 rate)
+{
+  atom_trak_set_audio (trak, context);
+  trak->mdia.mdhd.time_info.timescale = rate;
+}
+
+static void
+atom_trak_set_video_commons (AtomTRAK * trak, AtomsContext * context,
+    guint32 rate, guint32 width, guint32 height)
+{
+  atom_trak_set_video (trak, context, width, height);
+  trak->mdia.mdhd.time_info.timescale = rate;
+  trak->tkhd.width = width << 16;
+  trak->tkhd.height = height << 16;
+}
+
+void
+atom_trak_set_audio_type (AtomTRAK * trak, AtomsContext * context,
+    AudioSampleEntry * entry, guint32 scale, AtomInfo * ext, gint sample_size)
+{
+  SampleTableEntryMP4A *ste;
+
+  atom_trak_set_audio_commons (trak, context, scale);
+  ste = atom_trak_add_audio_entry (trak, context, entry->fourcc);
+
+  trak->is_video = FALSE;
+  trak->is_h264 = FALSE;
+
+  ste->version = entry->version;
+  ste->compression_id = entry->compression_id;
+  ste->sample_size = entry->sample_size;
+  ste->sample_rate = entry->sample_rate << 16;
+  ste->channels = entry->channels;
+
+  ste->samples_per_packet = entry->samples_per_packet;
+  ste->bytes_per_sample = entry->bytes_per_sample;
+  ste->bytes_per_packet = entry->bytes_per_packet;
+  ste->bytes_per_frame = entry->bytes_per_frame;
+
+  if (ext)
+    ste->extension_atoms = g_list_prepend (ste->extension_atoms, ext);
+
+  /* 0 size means variable size */
+  atom_trak_set_constant_size_samples (trak, sample_size);
+}
+
+AtomInfo *
+build_pasp_extension (AtomTRAK * trak, gint par_width, gint par_height)
+{
+  AtomData *atom_data;
+  GstBuffer *buf;
+  guint8 *data;
+
+  buf = gst_buffer_new_and_alloc (8);
+  data = GST_BUFFER_DATA (buf);
+
+  /* ihdr = image header box */
+  GST_WRITE_UINT32_BE (data, par_width);
+  GST_WRITE_UINT32_BE (data + 4, par_height);
+
+  atom_data = atom_data_new_from_gst_buffer (FOURCC_pasp, buf);
+  gst_buffer_unref (buf);
+
+  return build_atom_info_wrapper ((Atom *) atom_data, (gpointer)atom_data_copy_data,
+          (gpointer)atom_data_free);
+}
+
+void
+atom_trak_set_video_type (AtomTRAK * trak, AtomsContext * context,
+    VisualSampleEntry * entry, guint32 scale, AtomInfo * ext)
+{
+  SampleTableEntryMP4V *ste;
+  gint dwidth, dheight;
+  gint par_n = 0, par_d = 0;
+
+  if ((entry->par_n != 1 || entry->par_d != 1) &&
+      (entry->par_n != entry->par_d)) {
+    par_n = entry->par_n;
+    par_d = entry->par_d;
+  }
+
+  dwidth = entry->width;
+  dheight = entry->height;
+  /* ISO file spec says track header w/h indicates track's visual presentation
+   * (so this together with pixels w/h implicitly defines PAR) */
+  if (par_n && (context->flavor != ATOMS_TREE_FLAVOR_MOV)) {
+    if (par_n > par_d) {
+      dwidth = entry->width * par_n / par_d;
+      dheight = entry->height;
+    } else {
+      dwidth = entry->width * par_n / par_d;
+      dheight = entry->height;
+    }
+  }
+
+  atom_trak_set_video_commons (trak, context, scale, dwidth, dheight);
+  ste = atom_trak_add_video_entry (trak, context, entry->fourcc);
+
+  trak->is_video = TRUE;
+  trak->is_h264 = (entry->fourcc == FOURCC_avc1);
+
+  ste->width = entry->width;
+  ste->height = entry->height;
+  ste->depth = entry->depth;
+  ste->color_table_id = entry->color_table_id;
+  ste->frame_count = entry->frame_count;
+
+  if (ext)
+    ste->extension_atoms = g_list_prepend (ste->extension_atoms, ext);
+
+  /* QT spec has a pasp extension atom in stsd that can hold PAR */
+  if (par_n && (context->flavor == ATOMS_TREE_FLAVOR_MOV)) {
+    ste->extension_atoms = g_list_append (ste->extension_atoms,
+        build_pasp_extension (trak, par_n, par_d));
+  }
+}
+
+/* some sample description construction helpers */
+
+AtomInfo *
+build_esds_extension (AtomTRAK * trak, guint8 object_type, guint8 stream_type,
+    const GstBuffer * codec_data)
+{
+  guint32 track_id;
+  AtomESDS *esds;
+
+  track_id = trak->tkhd.track_ID;
+
+  esds = atom_esds_new ();
+  esds->es.id = track_id & 0xFFFF;
+  esds->es.dec_conf_desc.object_type = object_type;
+  esds->es.dec_conf_desc.stream_type = stream_type << 2 | 0x01;
+
+  /* optional DecoderSpecificInfo */
+  if (codec_data) {
+    DecoderSpecificInfoDescriptor *desc;
+
+    esds->es.dec_conf_desc.dec_specific_info = desc =
+        desc_dec_specific_info_new ();
+    desc_dec_specific_info_alloc_data (desc, GST_BUFFER_SIZE (codec_data));
+
+    memcpy (desc->data, GST_BUFFER_DATA (codec_data),
+        GST_BUFFER_SIZE (codec_data));
+  }
+
+  return build_atom_info_wrapper ((Atom *) esds, (gpointer)atom_esds_copy_data,
+          (gpointer)atom_esds_free);
+}
+
+AtomInfo *
+build_mov_aac_extension (AtomTRAK * trak, const GstBuffer * codec_data)
+{
+  AtomWAVE *wave;
+  AtomFRMA *frma;
+  Atom *ext_atom;
+  GstBuffer *buf;
+
+  /* Add WAVE atom to the MP4A sample table entry */
+  wave = atom_wave_new ();
+
+  /* Prepend Terminator atom to the WAVE list first, so it ends up last */
+  ext_atom = (Atom *) atom_data_new (FOURCC_null);
+  wave->extension_atoms =
+      atom_info_list_prepend_atom (wave->extension_atoms, (Atom *) ext_atom,
+      (AtomCopyDataFunc) atom_data_copy_data, (AtomFreeFunc) atom_data_free);
+
+  /* Add ESDS atom to WAVE */
+  wave->extension_atoms = g_list_prepend (wave->extension_atoms,
+      build_esds_extension (trak, ESDS_OBJECT_TYPE_MPEG4_P3,
+          ESDS_STREAM_TYPE_AUDIO, codec_data));
+
+  /* Add MP4A atom to the WAVE:
+   * not really in spec, but makes offset based players happy */
+  buf = gst_buffer_new_and_alloc (4);
+  *((guint32 *) GST_BUFFER_DATA (buf)) = 0;
+  ext_atom = (Atom *) atom_data_new_from_gst_buffer (FOURCC_mp4a, buf);
+  gst_buffer_unref (buf);
+
+  wave->extension_atoms =
+      atom_info_list_prepend_atom (wave->extension_atoms, (Atom *) ext_atom,
+      (AtomCopyDataFunc) atom_data_copy_data, (AtomFreeFunc) atom_data_free);
+
+  /* Add FRMA to the WAVE */
+  frma = atom_frma_new ();
+  frma->media_type = FOURCC_mp4a;
+
+  wave->extension_atoms =
+      atom_info_list_prepend_atom (wave->extension_atoms, (Atom *) frma,
+      (AtomCopyDataFunc) atom_frma_copy_data, (AtomFreeFunc) atom_frma_free);
+
+  return build_atom_info_wrapper ((Atom *) wave, (gpointer)atom_wave_copy_data,
+          (gpointer)atom_wave_free);
+}
+
+AtomInfo *
+build_jp2h_extension (AtomTRAK * trak, gint width, gint height, guint32 fourcc)
+{
+  AtomData *atom_data;
+  GstBuffer *buf;
+  guint8 *data;
+  guint8 cenum;
+
+  if (fourcc == GST_MAKE_FOURCC ('s', 'R', 'G', 'B')) {
+    cenum = 0x10;
+  } else if (fourcc == GST_MAKE_FOURCC ('s', 'Y', 'U', 'V')) {
+    cenum = 0x12;
+  } else
+    return FALSE;
+
+  buf = gst_buffer_new_and_alloc (22 + 15);
+  data = GST_BUFFER_DATA (buf);
+
+  /* ihdr = image header box */
+  GST_WRITE_UINT32_BE (data, 22);
+  GST_WRITE_UINT32_LE (data + 4, GST_MAKE_FOURCC ('i', 'h', 'd', 'r'));
+  GST_WRITE_UINT32_BE (data + 8, height);
+  GST_WRITE_UINT32_BE (data + 12, width);
+  /* FIXME perhaps parse from stream,
+   * though exactly 3 in any respectable colourspace */
+  GST_WRITE_UINT16_BE (data + 16, 3);
+  /* 8 bits per component, unsigned */
+  GST_WRITE_UINT8 (data + 18, 0x7);
+  /* compression type; reserved */
+  GST_WRITE_UINT8 (data + 19, 0x7);
+  /* colour space (un)known */
+  GST_WRITE_UINT8 (data + 20, 0x0);
+  /* intellectual property right (box present) */
+  GST_WRITE_UINT8 (data + 21, 0x0);
+
+  /* colour specification box */
+  data += 22;
+  GST_WRITE_UINT32_BE (data, 15);
+  GST_WRITE_UINT32_LE (data + 4, GST_MAKE_FOURCC ('c', 'o', 'l', 'r'));
+  /* specification method: enumerated */
+  GST_WRITE_UINT8 (data + 8, 0x1);
+  /* precedence; reserved */
+  GST_WRITE_UINT8 (data + 9, 0x0);
+  /* approximation; reserved */
+  GST_WRITE_UINT8 (data + 10, 0x0);
+  /* enumerated colourspace */
+  GST_WRITE_UINT32_BE (data + 11, cenum);
+
+  atom_data = atom_data_new_from_gst_buffer (FOURCC_jp2h, buf);
+  gst_buffer_unref (buf);
+
+  return build_atom_info_wrapper ((Atom *) atom_data, (gpointer)atom_data_copy_data,
+          (gpointer)atom_data_free);
+}
+
+AtomInfo *
+build_codec_data_extension (guint32 fourcc, const GstBuffer * codec_data)
+{
+  AtomData *data;
+  AtomInfo *result = NULL;
+
+  if (codec_data) {
+    data = atom_data_new_from_gst_buffer (fourcc, codec_data);
+    result = build_atom_info_wrapper ((Atom *) data, (gpointer)atom_data_copy_data,
+            (gpointer)atom_data_free);
+  }
+
+  return result;
+}
+
+AtomInfo *
+build_amr_extension ()
+{
+  guint8 ext[9];
+  GstBuffer *buf;
+  AtomInfo *res;
+
+  buf = gst_buffer_new ();
+  GST_BUFFER_DATA (buf) = ext;
+  GST_BUFFER_SIZE (buf) = sizeof (ext);
+
+  /* vendor */
+  GST_WRITE_UINT32_LE (ext, 0);
+  /* decoder version */
+  GST_WRITE_UINT8 (ext + 4, 0);
+  /* mode set (all modes) */
+  GST_WRITE_UINT16_BE (ext + 5, 0x81FF);
+  /* mode change period (no restriction) */
+  GST_WRITE_UINT8 (ext + 7, 0);
+  /* frames per sample */
+  GST_WRITE_UINT8 (ext + 8, 1);
+
+  res = build_codec_data_extension (GST_MAKE_FOURCC ('d', 'a', 'm', 'r'), buf);
+  gst_buffer_unref (buf);
+  return res;
+}
+
+AtomInfo *
+build_h263_extension ()
+{
+  guint8 ext[7];
+  GstBuffer *buf;
+  AtomInfo *res;
+
+  buf = gst_buffer_new ();
+  GST_BUFFER_DATA (buf) = ext;
+  GST_BUFFER_SIZE (buf) = sizeof (ext);
+
+  /* vendor */
+  GST_WRITE_UINT32_LE (ext, 0);
+  /* decoder version */
+  GST_WRITE_UINT8 (ext + 4, 0);
+  /* level / profile */
+  /* FIXME ? maybe ? obtain somewhere; baseline for now */
+  GST_WRITE_UINT8 (ext + 5, 10);
+  GST_WRITE_UINT8 (ext + 6, 0);
+
+  res = build_codec_data_extension (GST_MAKE_FOURCC ('d', '2', '6', '3'), buf);
+  gst_buffer_unref (buf);
+  return res;
+}