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matroska: implement preliminary support for the bitrate query

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Return the size / total duration as a ballpark estimate.

https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/issues/60
This commit is contained in:
Matthew Waters 2018-05-17 21:58:25 +10:00 committed by Edward Hervey
parent 8a7074f748
commit 40fc8aea8f
1 changed files with 47 additions and 2 deletions
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49
gst/matroska/matroska-demux.c
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@ -151,6 +151,8 @@ static gboolean gst_matroska_demux_handle_src_query (GstPad * pad,
static gboolean gst_matroska_demux_handle_sink_event (GstPad * pad,
GstObject * parent, GstEvent * event);
static gboolean gst_matroska_demux_handle_sink_query (GstPad * pad,
GstObject * parent, GstQuery * query);
static GstFlowReturn gst_matroska_demux_chain (GstPad * pad,
GstObject * object, GstBuffer * buffer);
@ -271,6 +273,8 @@ gst_matroska_demux_init (GstMatroskaDemux * demux)
GST_DEBUG_FUNCPTR (gst_matroska_demux_chain));
gst_pad_set_event_function (demux->common.sinkpad,
GST_DEBUG_FUNCPTR (gst_matroska_demux_handle_sink_event));
gst_pad_set_query_function (demux->common.sinkpad,
GST_DEBUG_FUNCPTR (gst_matroska_demux_handle_sink_query));
gst_element_add_pad (GST_ELEMENT (demux), demux->common.sinkpad);
/* init defaults for common read context */
@ -3102,6 +3106,47 @@ gst_matroska_demux_handle_src_event (GstPad * pad, GstObject * parent,
return res;
}
static gboolean
gst_matroska_demux_handle_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query)
{
GstMatroskaDemux *demux = GST_MATROSKA_DEMUX (parent);
gboolean res = FALSE;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_BITRATE:
{
if (G_UNLIKELY (demux->cached_length == G_MAXUINT64 ||
demux->common.offset >= demux->cached_length)) {
demux->cached_length =
gst_matroska_read_common_get_length (&demux->common);
}
if (demux->cached_length < G_MAXUINT64
&& demux->common.segment.duration > 0) {
/* TODO: better results based on ranges/index tables */
guint bitrate =
gst_util_uint64_scale (8 * demux->cached_length, GST_SECOND,
demux->common.segment.duration);
GST_LOG_OBJECT (demux, "bitrate query byte length: %" G_GUINT64_FORMAT
" duration %" GST_TIME_FORMAT " resulting in a bitrate of %u",
demux->cached_length,
GST_TIME_ARGS (demux->common.segment.duration), bitrate);
gst_query_set_bitrate (query, bitrate);
res = TRUE;
}
break;
}
default:
res = gst_pad_query_default (pad, (GstObject *) demux, query);
break;
}
return res;
}
static GstFlowReturn
gst_matroska_demux_seek_to_previous_keyframe (GstMatroskaDemux * demux)
{
@ -4356,8 +4401,8 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
/* If we're doing a keyframe-only trickmode, only push keyframes on video
* streams */
if (delta_unit
&& demux->common.
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) {
&& demux->common.segment.
flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) {
GST_LOG_OBJECT (demux, "Skipping non-keyframe on stream %d",
stream->index);
ret = GST_FLOW_OK;