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atomsrecovery: expect more atom types at the headers

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Skip more atoms at the header until it finds the 'mdat' to continue the
moov recovery

https://bugzilla.gnome.org/show_bug.cgi?id=771478
This commit is contained in:
Thiago Santos 2017-03-11 12:27:28 -08:00
parent d9cd0e2e44
commit 4d9b17ad77
1 changed files with 50 additions and 23 deletions
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73
gst/isomp4/atomsrecovery.c
View file

@ -339,11 +339,58 @@ mdat_recov_file_parse_mdat_start (MdatRecovFile * mdatrf)
return fourcc == FOURCC_mdat;
}
static gboolean
mdat_recov_file_find_mdat (FILE * file, GError ** err)
{
guint32 fourcc = 0, size = 0;
gboolean failure = FALSE;
while (fourcc != FOURCC_mdat && !failure) {
if (!read_atom_header (file, &fourcc, &size)) {
goto parse_error;
}
switch (fourcc) {
/* skip these atoms */
case FOURCC_ftyp:
case FOURCC_free:
case FOURCC_udta:
if (fseek (file, size - 8, SEEK_CUR) != 0) {
goto file_seek_error;
}
break;
case FOURCC_mdat:
break;
default:
GST_ERROR ("Unexpected atom in headers %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (fourcc));
failure = TRUE;
break;
}
}
if (!failure) {
/* Reverse to mdat start */
if (fseek (file, -8, SEEK_CUR) != 0)
goto file_seek_error;
}
return !failure;
parse_error:
g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
"Failed to parse atom");
return FALSE;
file_seek_error:
g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
"Failed to seek to start of the file");
return FALSE;
}
MdatRecovFile *
mdat_recov_file_create (FILE * file, gboolean datafile, GError ** err)
{
MdatRecovFile *mrf = g_new0 (MdatRecovFile, 1);
guint32 fourcc, size;
g_return_val_if_fail (file != NULL, NULL);
@ -370,24 +417,9 @@ mdat_recov_file_create (FILE * file, gboolean datafile, GError ** err)
return mrf;
}
if (!read_atom_header (file, &fourcc, &size)) {
goto parse_error;
if (!mdat_recov_file_find_mdat (file, err)) {
goto fail;
}
if (fourcc != FOURCC_ftyp) {
/* this could be a prefix atom, let's skip it and try again */
if (fseek (file, size - 8, SEEK_CUR) != 0) {
goto file_seek_error;
}
if (!read_atom_header (file, &fourcc, &size)) {
goto parse_error;
}
}
if (fourcc != FOURCC_ftyp) {
goto parse_error;
}
if (fseek (file, size - 8, SEEK_CUR) != 0)
goto file_seek_error;
/* we don't parse this if we have a tmpdatafile */
if (!mdat_recov_file_parse_mdat_start (mrf)) {
@ -398,11 +430,6 @@ mdat_recov_file_create (FILE * file, gboolean datafile, GError ** err)
return mrf;
parse_error:
g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
"Failed to parse atom");
goto fail;
file_seek_error:
g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
"Failed to seek to start of the file");