atoms.c 139 KB
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/* Quicktime muxer plugin for GStreamer
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 * Copyright (C) 2008-2010 Thiago Santos <thiagoss@embedded.ufcg.edu.br>
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 * 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
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 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
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 */
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/*
 * 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.
 */
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#include "atoms.h"
#include <string.h>
#include <glib.h>

#include <gst/gst.h>
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#include <gst/base/gstbytewriter.h>
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#include <gst/tag/tag.h>
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#include <gst/video/video.h>
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/*
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 * 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;
}

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/*
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 * 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

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guint64
atoms_get_current_qt_time (void)
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{
  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)
{
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  ti->creation_time = ti->modification_time = atoms_get_current_qt_time ();
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  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);
}

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static guint32
atom_full_get_flags_as_uint (AtomFull * full)
{
  return full->flags[0] << 16 | full->flags[1] << 8 | full->flags[2];
}

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static void
atom_full_set_flags_as_uint (AtomFull * full, guint32 flags_as_uint)
{
  full->flags[2] = flags_as_uint & 0xFF;
  full->flags[1] = (flags_as_uint & 0xFF00) >> 8;
  full->flags[0] = (flags_as_uint & 0xFF0000) >> 16;
}

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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, copy_func, 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)
{
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  g_free (data->data);
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  data->data = g_new0 (guint8, size);
  data->datalen = size;
}

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static AtomData *
atom_data_new_from_data (guint32 fourcc, const guint8 * mem, gsize size)
{
  AtomData *data = atom_data_new (fourcc);

  atom_data_alloc_mem (data, size);
  memcpy (data->data, mem, size);
  return data;
}

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static AtomData *
atom_data_new_from_gst_buffer (guint32 fourcc, const GstBuffer * buf)
{
  AtomData *data = atom_data_new (fourcc);
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  gsize size = gst_buffer_get_size ((GstBuffer *) buf);
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  atom_data_alloc_mem (data, size);
  gst_buffer_extract ((GstBuffer *) buf, 0, data->data, size);
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  return data;
}

static void
atom_data_free (AtomData * data)
{
  atom_clear (&data->header);
  g_free (data->data);
  g_free (data);
}

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static AtomUUID *
atom_uuid_new (void)
{
  AtomUUID *uuid = g_new0 (AtomUUID, 1);

  atom_header_set (&uuid->header, FOURCC_uuid, 0, 0);
  return uuid;
}

static void
atom_uuid_free (AtomUUID * data)
{
  atom_clear (&data->header);
  g_free (data->data);
  g_free (data);
}

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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 *
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atom_esds_new (void)
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{
  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 *
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atom_frma_new (void)
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{
  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 *
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atom_wave_new (void)
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{
  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);
}

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static void
atom_elst_init (AtomELST * elst)
{
  guint8 flags[3] = { 0, 0, 0 };
  atom_full_init (&elst->header, FOURCC_elst, 0, 0, 0, flags);
  elst->entries = 0;
}

static void
atom_elst_clear (AtomELST * elst)
{
  GSList *walker;

  atom_full_clear (&elst->header);
  walker = elst->entries;
  while (walker) {
    g_free ((EditListEntry *) walker->data);
    walker = g_slist_next (walker);
  }
  g_slist_free (elst->entries);
}

static void
atom_edts_init (AtomEDTS * edts)
{
  atom_header_set (&edts->header, FOURCC_edts, 0, 0);
  atom_elst_init (&edts->elst);
}

static void
atom_edts_clear (AtomEDTS * edts)
{
  atom_clear (&edts->header);
  atom_elst_clear (&edts->elst);
}

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static AtomEDTS *
atom_edts_new (void)
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{
  AtomEDTS *edts = g_new0 (AtomEDTS, 1);
  atom_edts_init (edts);
  return edts;
}

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static void
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atom_edts_free (AtomEDTS * edts)
{
  atom_edts_clear (edts);
  g_free (edts);
}

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static void
atom_tcmi_init (AtomTCMI * tcmi)
{
  guint8 flags[3] = { 0, 0, 0 };

  atom_full_init (&tcmi->header, FOURCC_tcmi, 0, 0, 0, flags);
}

static void
atom_tcmi_clear (AtomTCMI * tcmi)
{
  atom_full_clear (&tcmi->header);
  tcmi->text_font = 0;
  tcmi->text_face = 0;
  tcmi->text_size = 0;
  tcmi->text_color[0] = 0;
  tcmi->text_color[1] = 0;
  tcmi->text_color[2] = 0;
  tcmi->bg_color[0] = 0;
  tcmi->bg_color[1] = 0;
  tcmi->bg_color[2] = 0;
  g_free (tcmi->font_name);
  tcmi->font_name = NULL;
}

static void
atom_tmcd_init (AtomTMCD * tmcd)
{
  atom_header_set (&tmcd->header, FOURCC_tmcd, 0, 0);
  atom_tcmi_init (&tmcd->tcmi);
}

static void
atom_tmcd_clear (AtomTMCD * tmcd)
{
  atom_clear (&tmcd->header);
  atom_tcmi_clear (&tmcd->tcmi);
}

static void
atom_gmin_init (AtomGMIN * gmin)
{
  guint8 flags[3] = { 0, 0, 0 };

  atom_full_init (&gmin->header, FOURCC_gmin, 0, 0, 0, flags);
}

static void
atom_gmin_clear (AtomGMIN * gmin)
{
  atom_full_clear (&gmin->header);
  gmin->graphics_mode = 0;
  gmin->opcolor[0] = 0;
  gmin->opcolor[1] = 0;
  gmin->opcolor[2] = 0;
  gmin->balance = 0;
  gmin->reserved = 0;
}

static void
atom_gmhd_init (AtomGMHD * gmhd)
{
  atom_header_set (&gmhd->header, FOURCC_gmhd, 0, 0);
  atom_gmin_init (&gmhd->gmin);
  atom_tmcd_init (&gmhd->tmcd);
}

static void
atom_gmhd_clear (AtomGMHD * gmhd)
{
  atom_clear (&gmhd->header);
  atom_gmin_clear (&gmhd->gmin);
  atom_tmcd_clear (&gmhd->tmcd);
}

static AtomGMHD *
atom_gmhd_new (void)
{
  AtomGMHD *gmhd = g_new0 (AtomGMHD, 1);
  atom_gmhd_init (gmhd);
  return gmhd;
}

static void
atom_gmhd_free (AtomGMHD * gmhd)
{
  atom_gmhd_clear (gmhd);
  g_free (gmhd);
}

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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 *
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sample_entry_mp4a_new (void)
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{
  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);
}

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static void
sample_entry_tmcd_init (SampleTableEntryTMCD * tmcd)
{
  atom_sample_entry_init (&tmcd->se, FOURCC_tmcd);

  tmcd->tc_flags = 0;
  tmcd->timescale = 0;
  tmcd->frame_duration = 0;
  tmcd->n_frames = 0;

  tmcd->name.language_code = 0;
  g_free (tmcd->name.name);
  tmcd->name.name = NULL;
}

static SampleTableEntryTMCD *
sample_entry_tmcd_new (void)
{
  SampleTableEntryTMCD *tmcd = g_new0 (SampleTableEntryTMCD, 1);

  sample_entry_tmcd_init (tmcd);
  return tmcd;
}

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static void
sample_entry_tmcd_free (SampleTableEntryTMCD * tmcd)
{
  atom_sample_entry_free (&tmcd->se);
  g_free (tmcd->name.name);
  g_free (tmcd);
}

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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;
}

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static void
sample_entry_tx3g_init (SampleTableEntryTX3G * tx3g)
{
  atom_sample_entry_init (&tx3g->se, FOURCC_tx3g);

  tx3g->display_flags = 0;
  tx3g->font_id = 1;            /* must be 1 as there is a single font */
  tx3g->font_face = 0;
  tx3g->foreground_color_rgba = 0xFFFFFFFF;     /* white, opaque */

  /* can't set this now */
  tx3g->default_text_box = 0;
  tx3g->font_size = 0;
}

static void
sample_entry_tx3g_free (SampleTableEntryTX3G * tx3g)
{
  atom_sample_entry_free (&tx3g->se);
  g_free (tx3g);
}

static SampleTableEntryTX3G *
sample_entry_tx3g_new (void)
{
  SampleTableEntryTX3G *tx3g = g_new0 (SampleTableEntryTX3G, 1);

  sample_entry_tx3g_init (tx3g);
  return tx3g;
}


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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;
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  stsd->n_entries = 0;
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}

static void
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atom_stsd_remove_entries (AtomSTSD * stsd)
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{
  GList *walker;

  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;
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      case SUBTITLE:
        sample_entry_tx3g_free ((SampleTableEntryTX3G *) se);
        break;
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      case TIMECODE:
        sample_entry_tmcd_free ((SampleTableEntryTMCD *) se);
        break;
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      default:
        /* best possible cleanup */
        atom_sample_entry_free (se);
    }
    g_list_free (aux);
  }
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  stsd->n_entries = 0;
}

static void
atom_stsd_clear (AtomSTSD * stsd)
{
  atom_stsd_remove_entries (stsd);
  atom_full_clear (&stsd->header);
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}

static void
atom_ctts_init (AtomCTTS * ctts)
{
  guint8 flags[3] = { 0, 0, 0 };

  atom_full_init (&ctts->header, FOURCC_ctts, 0, 0, 0, flags);
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  atom_array_init (&ctts->entries, 128);
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  ctts->do_pts = FALSE;
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}

static AtomCTTS *
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atom_ctts_new (void)
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{
  AtomCTTS *ctts = g_new0 (AtomCTTS, 1);

  atom_ctts_init (ctts);
  return ctts;
}

static void
atom_ctts_free (AtomCTTS * ctts)
{
  atom_full_clear (&ctts->header);
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  atom_array_clear (&ctts->entries);
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  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);
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  atom_array_init (&stts->entries, 512);
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}

static void
atom_stts_clear (AtomSTTS * stts)
{
  atom_full_clear (&stts->header);
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  atom_array_clear (&stts->entries);
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}

static void
atom_stsz_init (AtomSTSZ * stsz)
{
  guint8 flags[3] = { 0, 0, 0 };

  atom_full_init (&stsz->header, FOURCC_stsz, 0, 0, 0, flags);
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  atom_array_init (&stsz->entries, 1024);
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  stsz->sample_size = 0;
  stsz->table_size = 0;
}

static void
atom_stsz_clear (AtomSTSZ * stsz)
{
  atom_full_clear (&stsz->header);
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  atom_array_clear (&stsz->entries);
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  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);
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  atom_array_init (&stsc->entries, 128);
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}

static void
atom_stsc_clear (AtomSTSC * stsc)
{
  atom_full_clear (&stsc->header);
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  atom_array_clear (&stsc->entries);
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}

static void
atom_co64_init (AtomSTCO64 * co64)
{
  guint8 flags[3] = { 0, 0, 0 };

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  atom_full_init (&co64->header, FOURCC_stco, 0, 0, 0, flags);
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  atom_array_init (&co64->entries, 256);
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}

static void
atom_stco64_clear (AtomSTCO64 * stco64)
{
  atom_full_clear (&stco64->header);
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  atom_array_clear (&stco64->entries);
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}

static void
atom_stss_init (AtomSTSS * stss)
{
  guint8 flags[3] = { 0, 0, 0 };

  atom_full_init (&stss->header, FOURCC_stss, 0, 0, 0, flags);
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  atom_array_init (&stss->entries, 128);
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}

static void
atom_stss_clear (AtomSTSS * stss)
{
  atom_full_clear (&stss->header);
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  atom_array_clear (&stss->entries);
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}

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void
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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);
}

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void
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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 *
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atom_smhd_new (void)
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{
  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
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atom_hdlr_init (AtomHDLR * hdlr, AtomsContext * context)
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{
  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 ("");
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  /* Store the flavor to know how to serialize the 'name' string */
  hdlr->flavor = context->flavor;
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}

static AtomHDLR *
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atom_hdlr_new (AtomsContext * context)
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{
  AtomHDLR *hdlr = g_new0 (AtomHDLR, 1);

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  atom_hdlr_init (hdlr, context);
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  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 *
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atom_url_new (void)
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{
  AtomURL *url = g_new0 (AtomURL, 1);

  atom_url_init (url);
  return url;
}

static AtomFull *
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atom_alis_new (void)
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{
  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;
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  minf->gmhd = NULL;
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  if (context->flavor == ATOMS_TREE_FLAVOR_MOV) {
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    minf->hdlr = atom_hdlr_new (context);
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    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;
  }
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  if (minf->gmhd) {
    atom_gmhd_free (minf->gmhd);
    minf->gmhd = NULL;
  }
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}

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);
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  atom_hdlr_init (&mdia->hdlr, context);
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  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);

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  tkhd->creation_time = tkhd->modification_time = atoms_get_current_qt_time ();
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  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_ilst_init (AtomILST * ilst)
{
  atom_header_set (&ilst->header, FOURCC_ilst, 0, 0);
  ilst->entries = NULL;
}

static AtomILST *
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atom_ilst_new (void)
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{
  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
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atom_meta_init (AtomMETA * meta, AtomsContext * context)
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{
  guint8 flags[3] = { 0, 0, 0 };

  atom_full_init (&meta->header, FOURCC_meta, 0, 0, 0, flags);
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  atom_hdlr_init (&meta->hdlr, context);
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  /* FIXME (ISOM says this is always 0) */
  meta->hdlr.component_type = FOURCC_mhlr;
  meta->hdlr.handler_type = FOURCC_mdir;
  meta->ilst = NULL;
}

static AtomMETA *
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atom_meta_new (AtomsContext * context)
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{
  AtomMETA *meta = g_new0 (AtomMETA, 1);

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  atom_meta_init (meta, context);
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  return meta;
}

static void
atom_meta_free (AtomMETA * meta)
{
  atom_full_clear (&meta->header);
  atom_hdlr_clear (&meta->hdlr);
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  if (meta->ilst)
    atom_ilst_free (meta->ilst);
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  meta->ilst = NULL;
  g_free (meta);
}

static void
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atom_udta_init_metatags (AtomUDTA * udta, AtomsContext * context)
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{
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  if (context->flavor != ATOMS_TREE_FLAVOR_3GP) {
    if (!udta->meta) {
      udta->meta = atom_meta_new (context);
    }
    if (!udta->meta->ilst) {
      udta->meta->ilst = atom_ilst_new ();
    }
  }
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}

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static void
atom_udta_init (AtomUDTA * udta, AtomsContext * context)
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{
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  atom_header_set (&udta->header, FOURCC_udta, 0, 0);
  udta->meta = NULL;
  udta->context = context;
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  atom_udta_init_metatags (udta, context);
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}

static void
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atom_udta_clear (AtomUDTA * udta)
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{
  atom_clear (&udta->header);
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  if (udta->meta)
    atom_meta_free (udta->meta);
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  udta->meta = NULL;
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  if (udta->entries)
    atom_info_list_free (udta->entries);
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}

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static void
atom_tref_init (AtomTREF * tref, guint32 reftype)
{
  atom_header_set (&tref->header, FOURCC_tref, 0, 0);
  tref->reftype = reftype;
  atom_array_init (&tref->entries, 128);
}

static void
atom_tref_clear (AtomTREF * tref)
{
  atom_clear (&tref->header);
  tref->reftype = 0;
  atom_array_clear (&tref->entries);
}

AtomTREF *
atom_tref_new (guint32 reftype)
{
  AtomTREF *tref;

  tref = g_new0 (AtomTREF, 1);
  atom_tref_init (tref, reftype);

  return tref;
}

static void
atom_tref_free (AtomTREF * tref)
{
  atom_tref_clear (tref);
  g_free (tref);
}

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/* Clear added tags, but keep the context/flavor the same */
void
atom_udta_clear_tags (AtomUDTA * udta)
{
  if (udta->entries) {
    atom_info_list_free (udta->entries);
    udta->entries = NULL;
  }
  if (udta->meta && udta->meta->ilst->entries) {
    atom_info_list_free (udta->meta->ilst->entries);
    udta->meta->ilst->entries = NULL;
  }
}

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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);
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  atom_full_set_flags_as_uint (&tag->data.header, flags_as_uint);
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  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);
}

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static void
atom_mehd_init (AtomMEHD * mehd)
{
  guint8 flags[3] = { 0, 0, 0 };

  atom_full_init (&mehd->header, FOURCC_mehd, 0, 0, 1, flags);
  mehd->fragment_duration = 0;
}

static void
atom_mvex_init (AtomMVEX * mvex)
{
  atom_header_set (&mvex->header, FOURCC_mvex, 0, 0);
  atom_mehd_init (&mvex->mehd);
  mvex->trexs = NULL;
}

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static void
atom_trak_init (AtomTRAK * trak, AtomsContext * context)
{
  atom_header_set (&trak->header, FOURCC_trak, 0, 0);

  atom_tkhd_init (&trak->tkhd, context);
  trak->context = context;
  atom_udta_init (&trak->udta, context);
  trak->edts = NULL;
  atom_mdia_init (&trak->mdia, context);
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  trak->tref = NULL;
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}

AtomTRAK *
atom_trak_new (AtomsContext * context)
{
  AtomTRAK *trak = g_new0 (AtomTRAK, 1);

  atom_trak_init (trak, context);
  return trak;
}

static void
atom_trak_clear (AtomTRAK * trak)
{
  atom_clear (&trak->header);
  atom_tkhd_clear (&trak->tkhd);
  if (trak->edts)
    atom_edts_free (trak->edts);
  atom_udta_clear (&trak->udta);
  atom_mdia_clear (&trak->mdia);
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  if (trak->tref)
    atom_tref_free (trak->tref);
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}

static void
atom_trak_free (AtomTRAK * trak)
{
  atom_trak_clear (trak);
  g_free (trak);
}


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static void
atom_moov_init (AtomMOOV * moov, AtomsContext * context)
{
  atom_header_set (&(moov->header), FOURCC_moov, 0, 0);
  atom_mvhd_init (&(moov->mvhd));
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  atom_mvex_init (&(moov->mvex));
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  atom_udta_init (&moov->udta, context);
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  moov->traks = NULL;
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  moov->context = *context;
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}

AtomMOOV *
atom_moov_new (AtomsContext * context)
{
  AtomMOOV *moov = g_new0 (AtomMOOV, 1);

  atom_moov_init (moov, context);
  return moov;
}

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static void
atom_trex_free (AtomTREX * trex)
{
  atom_full_clear (&trex->header);
  g_free (trex);
}

static void
atom_mvex_clear (AtomMVEX * mvex)
{
  GList *walker;

  atom_clear (&mvex->header);
  walker = mvex->trexs;
  while (walker) {
    atom_trex_free ((AtomTREX *) walker->data);
    walker = g_list_next (walker);
  }
  g_list_free (mvex->trexs);
  mvex->trexs = NULL;
}

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void
atom_moov_free (AtomMOOV * moov)
{
  GList *walker;

  atom_clear (&moov->header);
  atom_mvhd_clear (&moov->mvhd);

  walker = moov->traks;
  while (walker) {
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    atom_trak_free ((AtomTRAK *) walker->data);
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    walker = g_list_next (walker);
  }
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  g_list_free (moov->traks);
  moov->traks = NULL;
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  atom_udta_clear (&moov->udta);
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  atom_mvex_clear (&moov->mvex);

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  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);
}

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static guint64
atom_copy_empty (Atom * atom, guint8 ** buffer, guint64 * size,
    guint64 * offset)
{
  guint64 original_offset = *offset;

  prop_copy_uint32 (0, buffer, size, offset);

  return *offset - original_offset;
}

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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;
}

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static guint64
atom_uuid_copy_data (AtomUUID * uuid, guint8 ** buffer, guint64 * size,
    guint64 * offset)
{
  guint64 original_offset = *offset;

  if (!atom_copy_data (&uuid->header, buffer, size, offset)) {
    return 0;
  }
  prop_copy_uint8_array (uuid->uuid, 16, buffer, size, offset);
  if (uuid->datalen)
    prop_copy_uint8_array (uuid->data, uuid->datalen, buffer, size, offset);

  atom_write_size (buffer, size, offset, original_offset);
  return *offset - original_offset;
}

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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;
}

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guint64
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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);

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  if (hdlr->flavor == ATOMS_TREE_FLAVOR_MOV) {
    prop_copy_size_string ((guint8 *) hdlr->name, strlen (hdlr->name), buffer,
        size, offset);
  } else {
    /* assume isomedia base is more generic and use null terminated */
    prop_copy_null_terminated_string (hdlr->name, buffer, size, offset);
  }
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