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liveadder: fix assertion when copying buffer region

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In gst_live_adder_chain() function, calls to gst_buffer_copy_region() can lead
to assertion as 'offset + size <= bufsize' is not respected.
Indeed 'offset' and 'size' parameters are calculated through calling gst_live_adder_length_from_duration(),
and thus gst_util_uint64_scale_int_round().
Depending on the nearest integers, rounded values 'offset' and 'size' can then trigger the assertion.
This case mainly occurs when 'skip' value is > 0 in chain function process.

https://bugzilla.gnome.org/show_bug.cgi?id=753759
This commit is contained in:
Guillaume Marquebielle 2015-08-18 13:56:59 +02:00 committed by Olivier Crête
parent 7dd86c26b2
commit 30d58f4688
1 changed files with 41 additions and 8 deletions
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49
gst/liveadder/liveadder.c
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@ -876,8 +876,16 @@ gst_live_adder_length_from_duration (GstLiveAdder * adder,
return (guint) ret;
}
static GstClockTime
gst_live_adder_length_to_duration (GstLiveAdder * adder, guint size)
{
return GST_FRAMES_TO_CLOCK_TIME ((size /
GST_AUDIO_INFO_BPF (&adder->info)),
GST_AUDIO_INFO_RATE (&adder->info));
}
static GstFlowReturn
gst_live_live_adder_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
gst_live_adder_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstLiveAdder *adder = GST_LIVE_ADDER (parent);
GstLiveAdderPadPrivate *padprivate = NULL;
@ -885,6 +893,9 @@ gst_live_live_adder_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
GList *item = NULL;
GstClockTime skip = 0;
gint64 drift = 0; /* Positive if new buffer after old buffer */
gsize buffer_size = 0;
gsize subbuffer_size = 0;
gsize offset = 0;
GST_OBJECT_LOCK (adder);
@ -1037,9 +1048,19 @@ gst_live_live_adder_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
GstClockTime subbuffer_duration = GST_BUFFER_TIMESTAMP (oldbuffer) -
(GST_BUFFER_TIMESTAMP (buffer) + skip);
buffer_size = gst_buffer_get_size (buffer);
offset = gst_live_adder_length_from_duration (adder, skip);
subbuffer_size = gst_live_adder_length_from_duration (adder,
subbuffer_duration);
if (offset + subbuffer_size > buffer_size) {
subbuffer_size = buffer_size - offset;
subbuffer_duration = gst_live_adder_length_to_duration (adder,
subbuffer_size);
}
subbuffer = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL,
gst_live_adder_length_from_duration (adder, skip),
gst_live_adder_length_from_duration (adder, subbuffer_duration));
offset, subbuffer_size);
GST_BUFFER_TIMESTAMP (subbuffer) = GST_BUFFER_TIMESTAMP (buffer) + skip;
GST_BUFFER_DURATION (subbuffer) = subbuffer_duration;
@ -1090,10 +1111,22 @@ gst_live_live_adder_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
if (skip) {
GstClockTime subbuffer_duration = GST_BUFFER_DURATION (buffer) - skip;
GstClockTime subbuffer_ts = GST_BUFFER_TIMESTAMP (buffer) + skip;
GstBuffer *new_buffer = gst_buffer_copy_region (buffer,
GST_BUFFER_COPY_ALL,
gst_live_adder_length_from_duration (adder, skip),
gst_live_adder_length_from_duration (adder, subbuffer_duration));
GstBuffer *new_buffer;
buffer_size = gst_buffer_get_size (buffer);
offset = gst_live_adder_length_from_duration (adder, skip);
subbuffer_size = gst_live_adder_length_from_duration (adder,
subbuffer_duration);
if (offset + subbuffer_size > buffer_size) {
subbuffer_size = buffer_size - offset;
subbuffer_duration = gst_live_adder_length_to_duration (adder,
subbuffer_size);
}
new_buffer = gst_buffer_copy_region (buffer,
GST_BUFFER_COPY_ALL, offset, subbuffer_size);
gst_buffer_unref (buffer);
buffer = new_buffer;
GST_BUFFER_PTS (buffer) = subbuffer_ts;
@ -1369,7 +1402,7 @@ gst_live_adder_request_new_pad (GstElement * element, GstPadTemplate * templ,
gst_pad_set_element_private (newpad, padprivate);
gst_pad_set_chain_function (newpad, gst_live_live_adder_chain);
gst_pad_set_chain_function (newpad, gst_live_adder_chain);
if (!gst_pad_set_active (newpad, TRUE))