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tsdemux: Add locking around mpegtspacketiser groups.

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Otherwise occasionally DURATION queries can crash, if they happen at
the wrong moment.
This commit is contained in:
Jan Schmidt 2014-07-03 21:39:19 +10:00
parent 6e51790a11
commit c103f7134b
2 changed files with 40 additions and 3 deletions
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41
gst/mpegtsdemux/mpegtspacketizer.c
View file

@ -45,6 +45,9 @@ G_DEFINE_TYPE_EXTENDED (MpegTSPacketizer2, mpegts_packetizer, G_TYPE_OBJECT, 0,
#define ABSDIFF(a,b) ((a) < (b) ? (b) - (a) : (a) - (b))
#define PACKETIZER_GROUP_LOCK(p) g_mutex_lock(&((p)->group_lock))
#define PACKETIZER_GROUP_UNLOCK(p) g_mutex_unlock(&((p)->group_lock))
static void mpegts_packetizer_dispose (GObject * object);
static void mpegts_packetizer_finalize (GObject * object);
static GstClockTime calculate_skew (MpegTSPCR * pcr, guint64 pcrtime,
@ -234,6 +237,8 @@ mpegts_packetizer_class_init (MpegTSPacketizer2Class * klass)
static void
mpegts_packetizer_init (MpegTSPacketizer2 * packetizer)
{
g_mutex_init (&packetizer->group_lock);
packetizer->adapter = gst_adapter_new ();
packetizer->offset = 0;
packetizer->empty = TRUE;
@ -374,6 +379,7 @@ mpegts_packetizer_parse_adaptation_field_control (MpegTSPacketizer2 *
") offset:%" G_GUINT64_FORMAT, packet->pid, packet->pcr,
GST_TIME_ARGS (PCRTIME_TO_GSTTIME (packet->pcr)), packet->offset);
PACKETIZER_GROUP_LOCK (packetizer);
if (packetizer->calculate_skew
&& GST_CLOCK_TIME_IS_VALID (packetizer->last_in_time)) {
pcrtable = get_pcr_table (packetizer, packet->pid);
@ -384,6 +390,7 @@ mpegts_packetizer_parse_adaptation_field_control (MpegTSPacketizer2 *
pcrtable = get_pcr_table (packetizer, packet->pid);
record_pcr (packetizer, pcrtable, packet->pcr, packet->offset);
}
PACKETIZER_GROUP_UNLOCK (packetizer);
}
#ifndef GST_DISABLE_GST_DEBUG
/* OPCR */
@ -560,12 +567,15 @@ mpegts_packetizer_clear (MpegTSPacketizer2 * packetizer)
packetizer->last_in_time = GST_CLOCK_TIME_NONE;
/* Close current PCR group */
PACKETIZER_GROUP_LOCK (packetizer);
for (i = 0; i < MAX_PCR_OBS_CHANNELS; i++) {
if (packetizer->observations[i])
_close_current_group (packetizer->observations[i]);
else
break;
}
PACKETIZER_GROUP_UNLOCK (packetizer);
}
void
@ -592,12 +602,14 @@ mpegts_packetizer_flush (MpegTSPacketizer2 * packetizer, gboolean hard)
packetizer->last_in_time = GST_CLOCK_TIME_NONE;
/* Close current PCR group */
PACKETIZER_GROUP_LOCK (packetizer);
for (i = 0; i < MAX_PCR_OBS_CHANNELS; i++) {
if (packetizer->observations[i])
_close_current_group (packetizer->observations[i]);
else
break;
}
PACKETIZER_GROUP_UNLOCK (packetizer);
if (hard) {
/* For pull mode seeks in tsdemux the observation must be preserved */
@ -2078,9 +2090,12 @@ mpegts_packetizer_offset_to_ts (MpegTSPacketizer2 * packetizer,
if (G_UNLIKELY (offset < packetizer->refoffset))
return GST_CLOCK_TIME_NONE;
PACKETIZER_GROUP_LOCK (packetizer);
pcrtable = get_pcr_table (packetizer, pid);
if (g_list_length (pcrtable->groups) < 1) {
PACKETIZER_GROUP_UNLOCK (packetizer);
GST_WARNING ("Not enough observations to return a duration estimate");
return GST_CLOCK_TIME_NONE;
}
@ -2117,6 +2132,9 @@ mpegts_packetizer_offset_to_ts (MpegTSPacketizer2 * packetizer,
res =
PCRTIME_TO_GSTTIME (gst_util_uint64_scale (offset - packetizer->refoffset,
lastpcr, lastoffset));
PACKETIZER_GROUP_UNLOCK (packetizer);
GST_DEBUG ("Returning timestamp %" GST_TIME_FORMAT " for offset %"
G_GUINT64_FORMAT, GST_TIME_ARGS (res), offset);
@ -2130,7 +2148,10 @@ mpegts_packetizer_pts_to_ts (MpegTSPacketizer2 * packetizer,
GstClockTime pts, guint16 pcr_pid)
{
GstClockTime res = GST_CLOCK_TIME_NONE;
MpegTSPCR *pcrtable = get_pcr_table (packetizer, pcr_pid);
MpegTSPCR *pcrtable;
PACKETIZER_GROUP_LOCK (packetizer);
pcrtable = get_pcr_table (packetizer, pcr_pid);
/* Use clock skew if present */
if (packetizer->calculate_skew
@ -2232,6 +2253,8 @@ mpegts_packetizer_pts_to_ts (MpegTSPacketizer2 * packetizer,
} else
GST_WARNING ("Not enough information to calculate proper timestamp");
PACKETIZER_GROUP_UNLOCK (packetizer);
GST_DEBUG ("Returning timestamp %" GST_TIME_FORMAT " for pts %"
GST_TIME_FORMAT " pcr_pid:0x%04x", GST_TIME_ARGS (res),
GST_TIME_ARGS (pts), pcr_pid);
@ -2253,10 +2276,13 @@ mpegts_packetizer_ts_to_offset (MpegTSPacketizer2 * packetizer,
if (!packetizer->calculate_offset)
return -1;
PACKETIZER_GROUP_LOCK (packetizer);
pcrtable = get_pcr_table (packetizer, pcr_pid);
if (pcrtable->groups == NULL)
if (pcrtable->groups == NULL) {
PACKETIZER_GROUP_UNLOCK (packetizer);
return -1;
}
querypcr = GSTTIME_TO_PCRTIME (ts);
@ -2333,6 +2359,8 @@ calculate_points:
prevgroup->values[prevgroup->last_value].pcr + prevgroup->pcr_offset;
}
PACKETIZER_GROUP_UNLOCK (packetizer);
GST_DEBUG ("Using prev PCR %" G_GUINT64_FORMAT " offset %" G_GUINT64_FORMAT,
firstpcr, firstoffset);
GST_DEBUG ("Using last PCR %" G_GUINT64_FORMAT " offset %" G_GUINT64_FORMAT,
@ -2355,7 +2383,9 @@ mpegts_packetizer_set_reference_offset (MpegTSPacketizer2 * packetizer,
{
GST_DEBUG ("Setting reference offset to %" G_GUINT64_FORMAT, refoffset);
PACKETIZER_GROUP_LOCK (packetizer);
packetizer->refoffset = refoffset;
PACKETIZER_GROUP_UNLOCK (packetizer);
}
void
@ -2370,10 +2400,13 @@ mpegts_packetizer_set_current_pcr_offset (MpegTSPacketizer2 * packetizer,
gboolean apply = FALSE;
/* fast path */
PACKETIZER_GROUP_LOCK (packetizer);
pcrtable = get_pcr_table (packetizer, pcr_pid);
if (pcrtable == NULL || pcrtable->current->group == NULL)
if (pcrtable == NULL || pcrtable->current->group == NULL) {
PACKETIZER_GROUP_UNLOCK (packetizer);
return;
}
pcr_offset = GSTTIME_TO_PCRTIME (offset);
@ -2393,6 +2426,7 @@ mpegts_packetizer_set_current_pcr_offset (MpegTSPacketizer2 * packetizer,
delta = pcr_offset - group->pcr_offset;
if (delta == 0) {
GST_DEBUG ("No shift to apply");
PACKETIZER_GROUP_UNLOCK (packetizer);
return;
}
GST_DEBUG ("Shifting groups by %" GST_TIME_FORMAT
@ -2417,4 +2451,5 @@ mpegts_packetizer_set_current_pcr_offset (MpegTSPacketizer2 * packetizer,
tgroup->first_offset,
GST_TIME_ARGS (PCRTIME_TO_GSTTIME (tgroup->pcr_offset)));
}
PACKETIZER_GROUP_UNLOCK (packetizer);
}

2
gst/mpegtsdemux/mpegtspacketizer.h
View file

@ -244,6 +244,8 @@ typedef struct _MpegTSPCR
struct _MpegTSPacketizer2 {
GObject parent;
GMutex group_lock;
GstAdapter *adapter;
/* streams hashed by pid */
/* FIXME : be more memory efficient (see how it's done in mpegtsbase) */