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qtmux: Add property for providing a threshold after which we create an edit list for gaps at the start

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=797290
This commit is contained in:
Sebastian Dröge 2018-10-19 17:02:11 +03:00
parent 324f8c7f3c
commit 01a2119ad0
2 changed files with 19 additions and 12 deletions
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29
gst/isomp4/gstqtmux.c
View file

@ -397,6 +397,7 @@ enum
PROP_INTERLEAVE_BYTES,
PROP_INTERLEAVE_TIME,
PROP_MAX_RAW_AUDIO_DRIFT,
PROP_START_GAP_THRESHOLD,
};
/* some spare for header size as well */
@ -420,6 +421,7 @@ enum
#define DEFAULT_INTERLEAVE_BYTES 0
#define DEFAULT_INTERLEAVE_TIME 250*GST_MSECOND
#define DEFAULT_MAX_RAW_AUDIO_DRIFT 40 * GST_MSECOND
#define DEFAULT_START_GAP_THRESHOLD 0
static void gst_qt_mux_finalize (GObject * object);
@ -647,6 +649,11 @@ gst_qt_mux_class_init (GstQTMuxClass * klass)
"Maximum allowed drift of raw audio samples vs. timestamps in nanoseconds",
0, G_MAXUINT64, DEFAULT_MAX_RAW_AUDIO_DRIFT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_START_GAP_THRESHOLD,
g_param_spec_uint64 ("start-gap-threshold", "Start Gap Threshold",
"Threshold for creating an edit list for gaps at the start in nanoseconds",
0, G_MAXUINT64, DEFAULT_START_GAP_THRESHOLD,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_qt_mux_request_new_pad);
@ -818,6 +825,7 @@ gst_qt_mux_init (GstQTMux * qtmux, GstQTMuxClass * qtmux_klass)
qtmux->interleave_bytes = DEFAULT_INTERLEAVE_BYTES;
qtmux->interleave_time = DEFAULT_INTERLEAVE_TIME;
qtmux->max_raw_audio_drift = DEFAULT_MAX_RAW_AUDIO_DRIFT;
qtmux->start_gap_threshold = DEFAULT_START_GAP_THRESHOLD;
/* always need this */
qtmux->context =
@ -3495,28 +3503,19 @@ gst_qt_mux_update_edit_lists (GstQTMux * qtmux)
has_gap = (qtpad->first_ts > (qtmux->first_ts + qtpad->dts_adjustment));
if (has_gap) {
GstClockTime diff, trak_lateness, one_percent_of_frame_duration = 0;
GstClockTime diff, trak_lateness;
diff = qtpad->first_ts - (qtmux->first_ts + qtpad->dts_adjustment);
lateness = gst_util_uint64_scale_round (diff,
qtmux->timescale, GST_SECOND);
/* Allow up to 1 trak timescale unit of lateness, Such a small
* timestamp/duration can't be represented by the trak-specific parts
* of the headers anyway, so it's irrelevantly small */
trak_lateness = gst_util_uint64_scale (diff,
atom_trak_get_timescale (qtpad->trak), GST_SECOND);
/* If the lateness is less than 1% of the (video) frame duration, we
* just allow it. It's usually irrelevantly small anyway, and having
* such a short edit list of -1 might break other cases (e.g. in
* prefill mode it will just error out for no real reason) */
if (qtpad->expected_sample_duration_n != 0) {
one_percent_of_frame_duration =
gst_util_uint64_scale (qtpad->expected_sample_duration_d,
GST_SECOND, 100 * qtpad->expected_sample_duration_n);
}
if (lateness > one_percent_of_frame_duration && trak_lateness > 0) {
if (trak_lateness > 0 && diff > qtmux->start_gap_threshold) {
GST_DEBUG_OBJECT (qtmux,
"Pad %s is a late stream by %" GST_TIME_FORMAT,
GST_PAD_NAME (qtpad->collect.pad), GST_TIME_ARGS (diff));
@ -6442,6 +6441,9 @@ gst_qt_mux_get_property (GObject * object,
case PROP_MAX_RAW_AUDIO_DRIFT:
g_value_set_uint64 (value, qtmux->max_raw_audio_drift);
break;
case PROP_START_GAP_THRESHOLD:
g_value_set_uint64 (value, qtmux->start_gap_threshold);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -6533,6 +6535,9 @@ gst_qt_mux_set_property (GObject * object,
case PROP_MAX_RAW_AUDIO_DRIFT:
qtmux->max_raw_audio_drift = g_value_get_uint64 (value);
break;
case PROP_START_GAP_THRESHOLD:
qtmux->start_gap_threshold = g_value_get_uint64 (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;

2
gst/isomp4/gstqtmux.h
View file

@ -289,6 +289,8 @@ struct _GstQTMux
gboolean reserved_prefill;
GstClockTime start_gap_threshold;
/* for request pad naming */
guint video_pads, audio_pads, subtitle_pads, caption_pads;
};