qtmux: adds the EDTS and ELTS atoms to atoms.c

These atoms will be useful for signaling streams
that start later in the file. As well for adding
edit lists if needed sometime later.

gst/qtmux/atoms.c

@@ -304,6 +304,57 @@ atom_wave_free (AtomWAVE * wave)
   g_free (wave);
 }
 
+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);
+}
+
+AtomEDTS *
+atom_edts_new ()
+{
+  AtomEDTS *edts = g_new0 (AtomEDTS, 1);
+  atom_edts_init (edts);
+  return edts;
+}
+
+void
+atom_edts_free (AtomEDTS * edts)
+{
+  atom_edts_clear (edts);
+  g_free (edts);
+}
+
 static void
 atom_sample_entry_init (SampleTableEntry * se, guint32 type)
 {
@@ -963,6 +1014,7 @@ atom_trak_init (AtomTRAK * trak, AtomsContext * context)
   atom_header_set (&trak->header, FOURCC_trak, 0, 0);
 
   atom_tkhd_init (&trak->tkhd, context);
+  trak->edts = NULL;
   atom_mdia_init (&trak->mdia, context);
 }
 
@@ -980,6 +1032,8 @@ atom_trak_free (AtomTRAK * trak)
 {
   atom_clear (&trak->header);
   atom_tkhd_clear (&trak->tkhd);
+  if (trak->edts)
+    atom_edts_free (trak->edts);
   atom_mdia_clear (&trak->mdia);
   g_free (trak);
 }
@@ -2054,6 +2108,45 @@ atom_mdia_copy_data (AtomMDIA * mdia, guint8 ** buffer, guint64 * size,
   return *offset - original_offset;
 }
 
+static guint64
+atom_elst_copy_data (AtomELST * elst, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+  GSList *walker;
+
+  if (!atom_full_copy_data (&elst->header, buffer, size, offset)) {
+    return 0;
+  }
+
+  prop_copy_uint32 (g_slist_length (elst->entries), buffer, size, offset);
+
+  for (walker = elst->entries; walker != NULL; walker = g_slist_next (walker)) {
+    EditListEntry *entry = (EditListEntry *) walker->data;
+    prop_copy_uint32 (entry->duration, buffer, size, offset);
+    prop_copy_uint32 (entry->media_time, buffer, size, offset);
+    prop_copy_uint32 (entry->media_rate, buffer, size, offset);
+  }
+  atom_write_size (buffer, size, offset, original_offset);
+  return *offset - original_offset;
+}
+
+static guint64
+atom_edts_copy_data (AtomEDTS * edts, guint8 ** buffer, guint64 * size,
+    guint64 * offset)
+{
+  guint64 original_offset = *offset;
+
+  if (!atom_copy_data (&(edts->header), buffer, size, offset))
+    return 0;
+
+  if (!atom_elst_copy_data (&(edts->elst), 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)
@@ -2066,6 +2159,11 @@ atom_trak_copy_data (AtomTRAK * trak, guint8 ** buffer, guint64 * size,
   if (!atom_tkhd_copy_data (&trak->tkhd, buffer, size, offset)) {
     return 0;
   }
+  if (trak->edts) {
+    if (!atom_edts_copy_data (trak->edts, buffer, size, offset)) {
+      return 0;
+    }
+  }
 
   if (!atom_mdia_copy_data (&trak->mdia, buffer, size, offset)) {
     return 0;

gst/qtmux/atoms.h

@@ -466,6 +466,29 @@ typedef struct _AtomMINF
   AtomSTBL stbl;
 } AtomMINF;
 
+typedef struct _EditListEntry
+{
+  /* duration in movie's timescale */
+  guint32 duration;
+  /* start time in media's timescale, -1 for empty */
+  guint32 media_time;
+  guint32 media_rate;  /* fixed point 32 bit */
+} EditListEntry;
+
+typedef struct _AtomELST
+{
+  AtomFull header;
+
+  /* number of entries is implicit */
+  GSList *entries;
+} AtomELST;
+
+typedef struct _AtomEDTS
+{
+  Atom header;
+  AtomELST elst;
+} AtomEDTS;
+
 typedef struct _AtomMDIA
 {
   Atom header;
@@ -521,6 +544,7 @@ typedef struct _AtomTRAK
   Atom header;
 
   AtomTKHD tkhd;
+  AtomEDTS *edts;
   AtomMDIA mdia;
 
   /* some helper info for structural conformity checks */
@@ -550,7 +574,6 @@ typedef struct _AtomWAVE
   GList *extension_atoms;
 } AtomWAVE;
 
-
 /*
  * Function to serialize an atom
  */