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baseparse: add gst_base_parse_set_ts_at_offset()

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Sets the buffer timestamps based on last seen timestamps at a
particular offset into the frame.

API: gst_base_parse_set_ts_at_offset()
This commit is contained in:
David Schleef 2013-02-11 16:51:48 -08:00
parent da68b74b5d
commit 2a8c95ff3b
2 changed files with 42 additions and 0 deletions
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39
libs/gst/base/gstbaseparse.c
View file

@ -4300,3 +4300,42 @@ gst_base_parse_change_state (GstElement * element, GstStateChange transition)
return result; return result;
} }
/**
* gst_base_parse_set_ts_at_offset:
* @parse: a #GstBaseParse
* @offset: offset into current buffer
*
* This function should only be called from a @handle_frame implementation.
*
* GstBaseParse creates initial timestamps for frames by using the last
* timestamp seen in the stream before the frame starts. In certain
* cases, the correct timestamps will occur in the stream after the
* start of the frame, but before the start of the actual picture data.
* This function can be used to set the timestamps based on the offset
* into the frame data that the picture starts.
*
* Since: 1.2
*/
void
gst_base_parse_set_ts_at_offset (GstBaseParse * parse, gsize offset)
{
GstClockTime pts, dts;
g_return_if_fail (GST_IS_BASE_PARSE (parse));
g_return_if_fail (offset >= 0);
pts = gst_adapter_prev_pts_at_offset (parse->priv->adapter, offset, NULL);
dts = gst_adapter_prev_dts_at_offset (parse->priv->adapter, offset, NULL);
if (!GST_CLOCK_TIME_IS_VALID (pts) || !GST_CLOCK_TIME_IS_VALID (dts)) {
GST_DEBUG_OBJECT (parse,
"offset adapter timestamps dts=%" GST_TIME_FORMAT " pts=%"
GST_TIME_FORMAT, GST_TIME_ARGS (dts), GST_TIME_ARGS (pts));
}
if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
parse->priv->prev_pts = parse->priv->next_pts = pts;
if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts))
parse->priv->prev_dts = parse->priv->next_dts = dts;
}

3
libs/gst/base/gstbaseparse.h
View file

@ -337,6 +337,9 @@ gboolean gst_base_parse_add_index_entry (GstBaseParse * parse,
gboolean key, gboolean key,
gboolean force); gboolean force);
void gst_base_parse_set_ts_at_offset (GstBaseParse *parse,
gsize offset);
G_END_DECLS G_END_DECLS
#endif /* __GST_BASE_PARSE_H__ */ #endif /* __GST_BASE_PARSE_H__ */