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adapter: add method to keep track of timestamps

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Keep track of the timestamp and offset associated with the current head of the
adapter.

API: GstAdapter::gst_adapter_prev_timestamp()
This commit is contained in:
Wim Taymans 2009-05-13 16:09:20 +02:00
parent 8ceff30ca9
commit 3d19b75147
3 changed files with 61 additions and 1 deletions
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1
docs/libs/gstreamer-libs-sections.txt
View file

@ -205,6 +205,7 @@ gst_adapter_available
gst_adapter_available_fast
gst_adapter_take
gst_adapter_take_buffer
gst_adapter_prev_timestamp
<SUBSECTION Standard>
GstAdapterClass
GST_ADAPTER

51
libs/gst/base/gstadapter.c
View file

@ -131,6 +131,8 @@ gst_adapter_init (GstAdapter * adapter, GstAdapterClass * g_class)
{
adapter->assembled_data = g_malloc (DEFAULT_SIZE);
adapter->assembled_size = DEFAULT_SIZE;
adapter->abidata.ABI.timestamp = GST_CLOCK_TIME_NONE;
adapter->abidata.ABI.distance = 0;
}
static void
@ -184,6 +186,22 @@ gst_adapter_clear (GstAdapter * adapter)
adapter->size = 0;
adapter->skip = 0;
adapter->assembled_len = 0;
adapter->abidata.ABI.timestamp = GST_CLOCK_TIME_NONE;
adapter->abidata.ABI.distance = 0;
}
static inline void
update_timestamp (GstAdapter * adapter, GstBuffer * buf)
{
GstClockTime timestamp;
timestamp = GST_BUFFER_TIMESTAMP (buf);
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
GST_LOG_OBJECT (adapter, "new timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (timestamp));
adapter->abidata.ABI.timestamp = timestamp;
adapter->abidata.ABI.distance = 0;
}
}
/**
@ -216,6 +234,7 @@ gst_adapter_push (GstAdapter * adapter, GstBuffer * buf)
if (G_UNLIKELY (adapter->buflist == NULL)) {
GST_LOG_OBJECT (adapter, "pushing first %u bytes", size);
adapter->buflist = adapter->buflist_end = g_slist_append (NULL, buf);
update_timestamp (adapter, buf);
} else {
/* Otherwise append to the end, and advance our end pointer */
GST_LOG_OBJECT (adapter, "pushing %u bytes at end, size now %u", size,
@ -448,16 +467,21 @@ gst_adapter_flush (GstAdapter * adapter, guint flush)
GST_LOG_OBJECT (adapter, "flushing out head buffer");
flush -= size;
adapter->skip = 0;
adapter->abidata.ABI.distance += size;
adapter->buflist =
g_slist_delete_link (adapter->buflist, adapter->buflist);
if (G_UNLIKELY (adapter->buflist == NULL)) {
GST_LOG_OBJECT (adapter, "adapter empty now");
adapter->buflist_end = NULL;
} else {
/* there is a new head buffer, update the timestamp */
update_timestamp (adapter, GST_BUFFER_CAST (adapter->buflist->data));
}
gst_buffer_unref (cur);
} else {
adapter->skip += flush;
adapter->abidata.ABI.distance += flush;
break;
}
}
@ -640,3 +664,30 @@ gst_adapter_available_fast (GstAdapter * adapter)
/* we can quickly get the data of the first buffer */
return size - adapter->skip;
}
/**
* gst_adapter_prev_timestamp:
* @adapter: a #GstAdapter
* @distance: pointer to location for distance or NULL
*
* Get the timestamp that was before the current byte in the adapter. When
* @distance is given, the amount of bytes between the timestamp and the current
* position is returned.
*
* The timestamp is reset to GST_CLOCK_TIME_NONE when the adapter is first
* created or when it is cleared.
*
* Returns: The previously seen timestamp.
*
* Since: 0.10.24
*/
GstClockTime
gst_adapter_prev_timestamp (GstAdapter * adapter, guint64 * distance)
{
g_return_val_if_fail (GST_IS_ADAPTER (adapter), GST_CLOCK_TIME_NONE);
if (distance)
*distance = adapter->abidata.ABI.distance;
return adapter->abidata.ABI.timestamp;
}

10
libs/gst/base/gstadapter.h
View file

@ -63,7 +63,13 @@ struct _GstAdapter {
/* Remember where the end of our buffer list is to
* speed up the push */
GSList *buflist_end;
gpointer _gst_reserved[GST_PADDING - 1];
union {
struct {
GstClockTime timestamp;
guint64 distance;
} ABI;
gpointer _gst_reserved[GST_PADDING - 1];
} abidata;
};
struct _GstAdapterClass {
@ -88,6 +94,8 @@ GstBuffer* gst_adapter_take_buffer (GstAdapter *adapter, guint nbytes);
guint gst_adapter_available (GstAdapter *adapter);
guint gst_adapter_available_fast (GstAdapter *adapter);
GstClockTime gst_adapter_prev_timestamp (GstAdapter *adapter, guint64 *distance);
G_END_DECLS
#endif /* __GST_ADAPTER_H__ */