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qtdemux: fix handling near end-of-file corner cases

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Also, relax some error handling to not bail out completely when something
feels amiss, but consider this EOF and continue with was obtained so far.
This commit is contained in:
Mark Nauwelaerts 2010-12-08 11:35:33 +01:00
parent d2948bb259
commit 5239e19e9c
1 changed files with 19 additions and 12 deletions
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31
gst/qtdemux/qtdemux.c
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@ -1856,9 +1856,10 @@ qtdemux_parse_uuid (GstQTDemux * qtdemux, const guint8 * buffer, gint length)
} }
} }
/* caller verifies at least 8 bytes in buf */
static void static void
extract_initial_length_and_fourcc (const guint8 * data, guint64 * plength, extract_initial_length_and_fourcc (const guint8 * data, guint size,
guint32 * pfourcc) guint64 * plength, guint32 * pfourcc)
{ {
guint64 length; guint64 length;
guint32 fourcc; guint32 fourcc;
@ -1870,7 +1871,7 @@ extract_initial_length_and_fourcc (const guint8 * data, guint64 * plength,
if (length == 0) { if (length == 0) {
length = G_MAXUINT32; length = G_MAXUINT32;
} else if (length == 1) { } else if (length == 1 && size >= 16) {
/* this means we have an extended size, which is the 64 bit value of /* this means we have an extended size, which is the 64 bit value of
* the next 8 bytes */ * the next 8 bytes */
length = QT_UINT64 (data + 8); length = QT_UINT64 (data + 8);
@ -2537,16 +2538,18 @@ gst_qtdemux_loop_state_header (GstQTDemux * qtdemux)
ret = gst_pad_pull_range (qtdemux->sinkpad, cur_offset, 16, &buf); ret = gst_pad_pull_range (qtdemux->sinkpad, cur_offset, 16, &buf);
if (G_UNLIKELY (ret != GST_FLOW_OK)) if (G_UNLIKELY (ret != GST_FLOW_OK))
goto beach; goto beach;
if (G_LIKELY (GST_BUFFER_SIZE (buf) == 16)) if (G_LIKELY (GST_BUFFER_SIZE (buf) >= 8))
extract_initial_length_and_fourcc (GST_BUFFER_DATA (buf), &length, &fourcc); extract_initial_length_and_fourcc (GST_BUFFER_DATA (buf),
GST_BUFFER_SIZE (buf), &length, &fourcc);
gst_buffer_unref (buf); gst_buffer_unref (buf);
/* maybe we already got most we needed, so only consider this eof */
if (G_UNLIKELY (length == 0)) { if (G_UNLIKELY (length == 0)) {
GST_ELEMENT_ERROR (qtdemux, STREAM, DEMUX, GST_ELEMENT_WARNING (qtdemux, STREAM, DEMUX,
(_("This file is invalid and cannot be played.")), (_("Invalid atom size.")),
("Header atom '%" GST_FOURCC_FORMAT "' has empty length", ("Header atom '%" GST_FOURCC_FORMAT "' has empty length",
GST_FOURCC_ARGS (fourcc))); GST_FOURCC_ARGS (fourcc)));
ret = GST_FLOW_ERROR; ret = GST_FLOW_UNEXPECTED;
goto beach; goto beach;
} }
@ -3887,7 +3890,8 @@ gst_qtdemux_chain (GstPad * sinkpad, GstBuffer * inbuf)
data = gst_adapter_peek (demux->adapter, demux->neededbytes); data = gst_adapter_peek (demux->adapter, demux->neededbytes);
/* get fourcc/length, set neededbytes */ /* get fourcc/length, set neededbytes */
extract_initial_length_and_fourcc ((guint8 *) data, &size, &fourcc); extract_initial_length_and_fourcc ((guint8 *) data, demux->neededbytes,
&size, &fourcc);
GST_DEBUG_OBJECT (demux, "Peeking found [%" GST_FOURCC_FORMAT "] " GST_DEBUG_OBJECT (demux, "Peeking found [%" GST_FOURCC_FORMAT "] "
"size: %" G_GUINT64_FORMAT, GST_FOURCC_ARGS (fourcc), size); "size: %" G_GUINT64_FORMAT, GST_FOURCC_ARGS (fourcc), size);
if (size == 0) { if (size == 0) {
@ -3978,7 +3982,8 @@ gst_qtdemux_chain (GstPad * sinkpad, GstBuffer * inbuf)
data = gst_adapter_peek (demux->adapter, demux->neededbytes); data = gst_adapter_peek (demux->adapter, demux->neededbytes);
/* parse the header */ /* parse the header */
extract_initial_length_and_fourcc (data, NULL, &fourcc); extract_initial_length_and_fourcc (data, demux->neededbytes, NULL,
&fourcc);
if (fourcc == FOURCC_moov) { if (fourcc == FOURCC_moov) {
GST_DEBUG_OBJECT (demux, "Parsing [moov]"); GST_DEBUG_OBJECT (demux, "Parsing [moov]");
@ -4977,11 +4982,13 @@ qtdemux_find_atom (GstQTDemux * qtdemux, guint64 * offset,
if (G_UNLIKELY (ret != GST_FLOW_OK)) if (G_UNLIKELY (ret != GST_FLOW_OK))
goto locate_failed; goto locate_failed;
if (G_LIKELY (GST_BUFFER_SIZE (buf) != 16)) { if (G_LIKELY (GST_BUFFER_SIZE (buf) != 16)) {
/* likely EOF */
ret = GST_FLOW_UNEXPECTED;
gst_buffer_unref (buf); gst_buffer_unref (buf);
ret = GST_FLOW_ERROR;
goto locate_failed; goto locate_failed;
} }
extract_initial_length_and_fourcc (GST_BUFFER_DATA (buf), length, &lfourcc); extract_initial_length_and_fourcc (GST_BUFFER_DATA (buf), 16, length,
&lfourcc);
gst_buffer_unref (buf); gst_buffer_unref (buf);
if (G_UNLIKELY (*length == 0)) { if (G_UNLIKELY (*length == 0)) {