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qtdemux: fix offset for type 2 mp4a sound sample descriptions.

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Allows us to correctly find the esds (and thus the codec data) for such
mp4a files.
This commit is contained in:
Michael Smith 2010-01-11 11:42:43 -08:00
parent fa32e08d91
commit 144fbd2d8f
1 changed files with 14 additions and 6 deletions
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20
gst/qtdemux/qtdemux.c
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@ -3603,25 +3603,33 @@ qtdemux_parse_node (GstQTDemux * qtdemux, GNode * node, const guint8 * buffer,
guint32 version;
guint32 offset;
/* There are two things we might encounter here: a true mp4a atom, and
an mp4a entry in an stsd atom. The latter is what we're interested
in, and it looks like an atom, but isn't really one. The true mp4a
atom is short, so we detect it based on length here. */
if (length < 20) {
/* small boxes are also inside wave inside the mp4a box */
GST_LOG_OBJECT (qtdemux, "skipping small mp4a box");
break;
}
version = QT_UINT32 (buffer + 16);
/* 'version' here is the sound sample description version. Types 0 and
1 are documented in the QTFF reference, but type 2 is not: it's
described in Apple header files instead (struct SoundDescriptionV2
in Movies.h) */
version = QT_UINT16 (buffer + 16);
GST_DEBUG_OBJECT (qtdemux, "mp4a version 0x%08x", version);
/* parse any esds descriptors */
switch (version) {
case 0x00000000:
case 0:
offset = 0x24;
break;
case 0x00010000:
case 1:
offset = 0x34;
break;
case 0x00020000:
offset = 0x58;
case 2:
offset = 0x48;
break;
default:
GST_WARNING_OBJECT (qtdemux, "unhandled mp4a version 0x%08x",