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decodebin2: error when all streams have no buffers

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In some cases (all buffers dropped by a parser) a decodebin2
chain might receive an EOS before it gets enough data to
expose a decoded pad. In the case that no streams can expose
a pad we should error out instead of hang.

Fixes #542758
This commit is contained in:
Thiago Santos 2009-11-19 14:51:33 -03:00
parent 7e5d6ed441
commit 0d6195686b
1 changed files with 88 additions and 16 deletions
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104
gst/playback/gstdecodebin2.c
View file

@ -108,6 +108,7 @@ GST_STATIC_PAD_TEMPLATE ("src%d",
GST_DEBUG_CATEGORY_STATIC (gst_decode_bin_debug);
#define GST_CAT_DEFAULT gst_decode_bin_debug
typedef struct _GstPendingPad GstPendingPad;
typedef struct _GstDecodeChain GstDecodeChain;
typedef struct _GstDecodeGroup GstDecodeGroup;
typedef struct _GstDecodePad GstDecodePad;
@ -342,6 +343,13 @@ static GstStateChangeReturn gst_decode_bin_change_state (GstElement * element,
g_mutex_unlock (GST_DECODE_BIN_CAST(dbin)->subtitle_lock); \
} G_STMT_END
struct _GstPendingPad
{
GstPad *pad;
GstDecodeChain *chain;
gulong event_probe_id;
};
/* GstDecodeGroup
*
* Streams belonging to the same group/chain of a media file
@ -396,6 +404,7 @@ struct _GstDecodeChain
GstDecodePad *endpad; /* Pad of this chain that could be exposed */
gboolean deadend; /* This chain is incomplete and can't be completed,
e.g. no suitable decoder could be found
e.g. stream got EOS without buffers
*/
GstCaps *endcaps; /* Caps that were used when linking to the endpad
or that resulted in the deadend
@ -415,7 +424,7 @@ static GstDecodeGroup *gst_decode_group_new (GstDecodeBin * dbin,
static gboolean gst_decode_chain_is_complete (GstDecodeChain * chain);
static void gst_decode_chain_handle_eos (GstDecodeChain * chain);
static gboolean gst_decode_chain_expose (GstDecodeChain * chain,
GList ** endpads);
GList ** endpads, gboolean * missing_plugin);
static gboolean gst_decode_chain_is_drained (GstDecodeChain * chain);
static gboolean gst_decode_group_is_complete (GstDecodeGroup * group);
static GstPad *gst_decode_group_control_demuxer_pad (GstDecodeGroup * group,
@ -467,6 +476,9 @@ static void gst_decode_pad_activate (GstDecodePad * dpad,
static void gst_decode_pad_unblock (GstDecodePad * dpad);
static void gst_decode_pad_set_blocked (GstDecodePad * dpad, gboolean blocked);
static void gst_pending_pad_free (GstPendingPad * ppad);
static gboolean pad_event_cb (GstPad * pad, GstEvent * event, gpointer data);
/********************************
* Standard GObject boilerplate *
********************************/
@ -1406,12 +1418,18 @@ any_caps:
}
setup_caps_delay:
{
GstPendingPad *ppad;
/* connect to caps notification */
CHAIN_MUTEX_LOCK (chain);
GST_LOG_OBJECT (dbin, "Chain %p has now %d dynamic pads", chain,
g_list_length (chain->pending_pads));
chain->pending_pads =
g_list_prepend (chain->pending_pads, gst_object_ref (pad));
ppad = g_slice_new0 (GstPendingPad);
ppad->pad = gst_object_ref (pad);
ppad->chain = chain;
ppad->event_probe_id =
gst_pad_add_event_probe (pad, (GCallback) pad_event_cb, ppad);
chain->pending_pads = g_list_prepend (chain->pending_pads, ppad);
CHAIN_MUTEX_UNLOCK (chain);
g_signal_connect (G_OBJECT (pad), "notify::caps",
G_CALLBACK (caps_notify_cb), chain);
@ -1796,6 +1814,33 @@ exit:
return;
}
static gboolean
pad_event_cb (GstPad * pad, GstEvent * event, gpointer data)
{
GstPendingPad *ppad = (GstPendingPad *) data;
GstDecodeChain *chain = ppad->chain;
GstDecodeBin *dbin = chain->dbin;
g_assert (ppad);
g_assert (chain);
g_assert (dbin);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_DEBUG_OBJECT (dbin, "Received EOS on a non final pad, this stream "
"ended too early");
chain->deadend = TRUE;
/* we don't set the endcaps because NULL endcaps means early EOS */
EXPOSE_LOCK (dbin);
if (gst_decode_chain_is_complete (dbin->decode_chain))
gst_decode_bin_expose (dbin);
EXPOSE_UNLOCK (dbin);
break;
default:
break;
}
return TRUE;
}
static void
pad_added_cb (GstElement * element, GstPad * pad, GstDecodeChain * chain)
{
@ -1832,11 +1877,12 @@ pad_removed_cb (GstElement * element, GstPad * pad, GstDecodeChain * chain)
* removed when the group's multiqueue is drained */
CHAIN_MUTEX_LOCK (chain);
for (l = chain->pending_pads; l; l = l->next) {
GstPad *opad = l->data;
GstPendingPad *ppad = l->data;
GstPad *opad = ppad->pad;
if (pad == opad) {
g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain);
gst_object_unref (pad);
gst_pending_pad_free (ppad);
chain->pending_pads = g_list_delete_link (chain->pending_pads, l);
break;
}
@ -1907,8 +1953,9 @@ caps_notify_cb (GstPad * pad, GParamSpec * unused, GstDecodeChain * chain)
CHAIN_MUTEX_LOCK (chain);
for (l = chain->pending_pads; l; l = l->next) {
if (l->data == pad) {
gst_object_unref (GST_OBJECT_CAST (l->data));
GstPendingPad *ppad = l->data;
if (ppad->pad == pad) {
gst_pending_pad_free (ppad);
chain->pending_pads = g_list_delete_link (chain->pending_pads, l);
break;
}
@ -2083,10 +2130,11 @@ gst_decode_chain_free_internal (GstDecodeChain * chain, gboolean hide)
}
for (l = chain->pending_pads; l; l = l->next) {
GstPad *pad = GST_PAD (l->data);
GstPendingPad *ppad = l->data;
GstPad *pad = ppad->pad;
g_signal_handlers_disconnect_by_func (pad, caps_notify_cb, chain);
gst_object_unref (pad);
gst_pending_pad_free (ppad);
l->data = NULL;
}
g_list_free (chain->pending_pads);
@ -2861,6 +2909,7 @@ static gboolean
gst_decode_bin_expose (GstDecodeBin * dbin)
{
GList *tmp, *endpads = NULL;
gboolean missing_plugin = FALSE;
gboolean already_exposed = TRUE;
GST_DEBUG_OBJECT (dbin, "Exposing currently active chains/groups");
@ -2875,7 +2924,7 @@ gst_decode_bin_expose (GstDecodeBin * dbin)
DYN_UNLOCK (dbin);
/* Get the pads that we're going to expose and mark things as exposed */
if (!gst_decode_chain_expose (dbin->decode_chain, &endpads)) {
if (!gst_decode_chain_expose (dbin->decode_chain, &endpads, &missing_plugin)) {
g_list_foreach (endpads, (GFunc) gst_object_unref, NULL);
g_list_free (endpads);
GST_ERROR_OBJECT (dbin, "Broken chain/group tree");
@ -2883,9 +2932,17 @@ gst_decode_bin_expose (GstDecodeBin * dbin)
return FALSE;
}
if (endpads == NULL) {
GST_WARNING_OBJECT (dbin, "No suitable plugins found");
GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL),
("no suitable plugins found"));
if (missing_plugin) {
GST_WARNING_OBJECT (dbin, "No suitable plugins found");
GST_ELEMENT_ERROR (dbin, CORE, MISSING_PLUGIN, (NULL),
("no suitable plugins found"));
} else {
/* in this case, the stream ended without buffers,
* just post a warning */
GST_WARNING_OBJECT (dbin, "All streams finished without buffers");
GST_ELEMENT_ERROR (dbin, STREAM, FAILED, (NULL),
("all streams without buffers"));
}
return FALSE;
}
@ -2982,14 +3039,18 @@ gst_decode_bin_expose (GstDecodeBin * dbin)
* Not MT-safe, call with decodebin expose lock! *
*/
static gboolean
gst_decode_chain_expose (GstDecodeChain * chain, GList ** endpads)
gst_decode_chain_expose (GstDecodeChain * chain, GList ** endpads,
gboolean * missing_plugin)
{
GstDecodeGroup *group;
GList *l;
GstDecodeBin *dbin;
if (chain->deadend)
if (chain->deadend) {
if (chain->endcaps)
*missing_plugin = TRUE;
return TRUE;
}
if (chain->endpad) {
if (!chain->endpad->blocked && !chain->endpad->exposed)
@ -3020,7 +3081,7 @@ gst_decode_chain_expose (GstDecodeChain * chain, GList ** endpads)
for (l = group->children; l; l = l->next) {
GstDecodeChain *childchain = l->data;
if (!gst_decode_chain_expose (childchain, endpads))
if (!gst_decode_chain_expose (childchain, endpads, missing_plugin))
return FALSE;
}
@ -3166,6 +3227,17 @@ gst_decode_pad_new (GstDecodeBin * dbin, GstPad * pad, GstDecodeChain * chain)
return dpad;
}
static void
gst_pending_pad_free (GstPendingPad * ppad)
{
g_assert (ppad);
g_assert (ppad->pad);
if (ppad->event_probe_id != 0)
gst_pad_remove_event_probe (ppad->pad, ppad->event_probe_id);
gst_object_unref (ppad->pad);
g_slice_free (GstPendingPad, ppad);
}
/*****
* Element add/remove