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ext/theora/theoradec.c: Fix ilog mask range overflow.

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Original commit message from CVS:
* ext/theora/theoradec.c: (theora_dec_chain):
Fix ilog mask range overflow.
This commit is contained in:
Ronald S. Bultje 2004-11-26 12:25:44 +00:00
parent e71527d6d9
commit f74ad551ef
2 changed files with 33 additions and 13 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2004-11-26 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* ext/theora/theoradec.c: (theora_dec_chain):
Fix ilog mask range overflow.
2004-11-26 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* ext/alsa/gstalsa.c: (gst_alsa_get_caps):

41
ext/theora/theoradec.c
View file

@ -543,7 +543,6 @@ theora_dec_chain (GstPad * pad, GstData * data)
/* granulepos to time */
outtime = GST_SECOND * theora_granule_time (&dec->state, dec->granulepos);
dec->granulepos++;
} else {
/* we don't know yet */
outtime = -1;
@ -564,15 +563,13 @@ theora_dec_chain (GstPad * pad, GstData * data)
if (packet.packet[0] & 0x80) {
if (packet.packetno > 3) {
GST_WARNING_OBJECT (GST_OBJECT (dec), "Ignoring header");
gst_data_unref (data);
return;
goto done;
}
/* header packet */
if (theora_decode_header (&dec->info, &dec->comment, &packet)) {
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("couldn't read header packet"));
gst_data_unref (data);
return;
goto done;
}
if (packet.packetno == 0) {
@ -678,32 +675,48 @@ theora_dec_chain (GstPad * pad, GstData * data)
dec->packetno++;
if (!dec->initialized) {
gst_data_unref (data);
return;
goto done;
}
/* the second most significant bit of the first data byte is cleared
* for keyframes */
keyframe = (packet.packet[0] & 0x40) == 0;
if (keyframe) {
guint ilog;
guint64 framecount;
gboolean add_one = FALSE;
dec->need_keyframe = FALSE;
ilog = _theora_ilog (dec->info.keyframe_frequency_force - 1);
if (dec->granulepos % (1 << ilog) == 0 &&
dec->granulepos > 0 && GST_BUFFER_OFFSET_END (buf) == -1) {
dec->granulepos--;
add_one = TRUE;
}
framecount = dec->granulepos >> ilog;
framecount += dec->granulepos - (framecount << ilog);
if (add_one) {
framecount++;
}
dec->granulepos = framecount << ilog;
if (add_one) {
outtime = GST_SECOND * theora_granule_time (&dec->state,
dec->granulepos);
}
} else if (dec->need_keyframe) {
GST_WARNING_OBJECT (dec, "dropping frame because we need a keyframe");
/* drop frames if we're looking for a keyframe */
gst_data_unref (data);
return;
goto done;
}
if (theora_decode_packetin (&dec->state, &packet)) {
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("theora decoder did not read data packet"));
gst_data_unref (data);
return;
goto done;
}
if (theora_decode_YUVout (&dec->state, &yuv) < 0) {
GST_ELEMENT_ERROR (GST_ELEMENT (dec), STREAM, DECODE,
(NULL), ("couldn't read out YUV image"));
gst_data_unref (data);
return;
goto done;
}
g_return_if_fail (yuv.y_width == dec->info.width);
@ -774,7 +787,9 @@ theora_dec_chain (GstPad * pad, GstData * data)
gst_pad_push (dec->srcpad, GST_DATA (out));
}
done:
gst_data_unref (data);
dec->granulepos++;
}
static GstElementStateReturn