diff options
| -rw-r--r-- | src/demuxers/demux_mpeg.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/src/demuxers/demux_mpeg.c b/src/demuxers/demux_mpeg.c index 45bbf235f..06bf6a364 100644 --- a/src/demuxers/demux_mpeg.c +++ b/src/demuxers/demux_mpeg.c @@ -17,7 +17,7 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA * - * $Id: demux_mpeg.c,v 1.69 2002/08/04 21:45:10 tmmm Exp $ + * $Id: demux_mpeg.c,v 1.70 2002/08/06 01:59:22 tmmm Exp $ * * demultiplexer for mpeg 1/2 program streams * reads streams of variable blocksizes @@ -95,7 +95,15 @@ typedef struct demux_mpeg_s { ( (long)(unsigned char)(ch3) | ( (long)(unsigned char)(ch2) << 8 ) | \ ( (long)(unsigned char)(ch1) << 16 ) | ( (long)(unsigned char)(ch0) << 24 ) ) +/* these are the known top-level QT atoms */ +#define FREE_ATOM QT_ATOM('f', 'r', 'e', 'e') +#define JUNK_ATOM QT_ATOM('j', 'u', 'n', 'k') #define MDAT_ATOM QT_ATOM('m', 'd', 'a', 't') +#define MOOV_ATOM QT_ATOM('m', 'o', 'o', 'v') +#define PNOT_ATOM QT_ATOM('p', 'n', 'o', 't') +#define SKIP_ATOM QT_ATOM('s', 'k', 'i', 'p') +#define WIDE_ATOM QT_ATOM('w', 'i', 'd', 'e') + #define ATOM_PREAMBLE_SIZE 8 /* @@ -140,6 +148,16 @@ static void find_mdat_atom(input_plugin_t *input, off_t *mdat_offset, break; } + /* make sure the atom checks out as some other top-level atom before + * proceeding */ + if ((atom != FREE_ATOM) && + (atom != JUNK_ATOM) && + (atom != MOOV_ATOM) && + (atom != PNOT_ATOM) && + (atom != SKIP_ATOM) && + (atom != WIDE_ATOM)) + break; + /* 64-bit length special case */ if (atom_size == 1) { if (input->read(input, atom_preamble, ATOM_PREAMBLE_SIZE) != |