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mxfdemux: Correctly implement timestamping in all cases

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When the material package track and source package track
edit rate are different the source package track edit
rate applies to the stored essence and the material track
edit rate only applies to the values in the track's sequence
and components.
This commit is contained in:
Sebastian Dröge 2009-02-08 21:23:03 +01:00
parent 3cc77d4dd6
commit 2b566be795
2 changed files with 46 additions and 21 deletions
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66
gst/mxf/mxfdemux.c
View file

@ -1087,13 +1087,24 @@ gst_mxf_demux_update_tracks (GstMXFDemux * demux)
if (first_run && MXF_IS_METADATA_MATERIAL_PACKAGE (current_package)) {
pad->current_component_index = 0;
pad->current_component_start = source_track->origin;
if (component->parent.duration >= -1)
pad->current_component_duration = component->parent.duration;
else
pad->current_component_duration = -1;
if (track->edit_rate.n != source_track->edit_rate.n ||
track->edit_rate.n != source_track->edit_rate.n) {
pad->current_component_start +=
gst_util_uint64_scale (component->start_position,
source_track->edit_rate.n * track->edit_rate.d,
source_track->edit_rate.d * track->edit_rate.n);
if (pad->current_component_duration != -1)
pad->current_component_duration =
gst_util_uint64_scale (pad->current_component_duration,
source_track->edit_rate.n * track->edit_rate.d,
source_track->edit_rate.d * track->edit_rate.n);
} else {
pad->current_component_start += component->start_position;
}
@ -1435,13 +1446,23 @@ gst_mxf_demux_pad_set_component (GstMXFDemux * demux, GstMXFDemuxPad * pad,
}
pad->current_component_start = source_track->origin;
if (pad->current_component->parent.duration >= -1)
pad->current_component_duration = pad->current_component->parent.duration;
else
pad->current_component_duration = -1;
if (pad->material_track->edit_rate.n != source_track->edit_rate.n ||
pad->material_track->edit_rate.n != source_track->edit_rate.n) {
pad->current_component_start +=
gst_util_uint64_scale (pad->current_component->start_position,
source_track->edit_rate.n * pad->material_track->edit_rate.d,
source_track->edit_rate.d * pad->material_track->edit_rate.n);
if (pad->current_component_duration != -1)
pad->current_component_duration =
gst_util_uint64_scale (pad->current_component_duration,
source_track->edit_rate.n * pad->material_track->edit_rate.d,
source_track->edit_rate.d * pad->material_track->edit_rate.n);
} else {
pad->current_component_start += pad->current_component->start_position;
}
@ -1648,22 +1669,21 @@ gst_mxf_demux_handle_generic_container_essence_element (GstMXFDemux * demux,
outbuf = gst_buffer_create_sub (inbuf, 0, GST_BUFFER_SIZE (inbuf));
GST_BUFFER_TIMESTAMP (outbuf) = pad->last_stop;
/* FIXME: What about tracks with source track edit rate != material
* track edit rate? Use one of them and set the relative rate
* to the other one as "rate" for the segment?
*/
GST_BUFFER_DURATION (outbuf) =
gst_util_uint64_scale (GST_SECOND, pad->material_track->edit_rate.d,
pad->material_track->edit_rate.n);
gst_util_uint64_scale (GST_SECOND,
pad->current_essence_track->source_track->edit_rate.d,
pad->current_essence_track->source_track->edit_rate.n);
GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET_NONE;
GST_BUFFER_OFFSET_END (outbuf) = GST_BUFFER_OFFSET_NONE;
/* Update accumulated error and compensate */
{
guint64 abs_error = (GST_SECOND * pad->material_track->edit_rate.d) %
pad->material_track->edit_rate.n;
guint64 abs_error =
(GST_SECOND * pad->current_essence_track->source_track->edit_rate.d) %
pad->current_essence_track->source_track->edit_rate.n;
pad->last_stop_accumulated_error +=
((gdouble) abs_error) / ((gdouble) pad->material_track->edit_rate.n);
((gdouble) abs_error) /
((gdouble) pad->current_essence_track->source_track->edit_rate.n);
}
if (pad->last_stop_accumulated_error >= 1.0) {
GST_BUFFER_DURATION (outbuf) += 1;
@ -1715,9 +1735,9 @@ gst_mxf_demux_handle_generic_container_essence_element (GstMXFDemux * demux,
pad->current_essence_track_position++;
if (pad->current_component) {
if (pad->current_component->parent.duration > 0 &&
if (pad->current_component_duration > 0 &&
pad->current_essence_track_position - pad->current_component_start
>= pad->current_component->parent.duration) {
>= pad->current_component_duration) {
GST_DEBUG_OBJECT (demux, "Switching to next component");
ret =
@ -2928,22 +2948,25 @@ gst_mxf_demux_pad_set_last_stop (GstMXFDemux * demux, GstMXFDemuxPad * p,
p->material_track->edit_rate.d * GST_SECOND,
p->material_track->edit_rate.n);
p->last_stop = start;
p->last_stop_accumulated_error = 0.0;
start -= sum;
p->last_stop = sum + gst_util_uint64_scale (start,
GST_SECOND * p->material_track->edit_rate.d,
p->material_track->edit_rate.n);;
p->last_stop_accumulated_error = 0.0;
if (gst_mxf_demux_pad_set_component (demux, p, i) != GST_FLOW_OK) {
p->eos = TRUE;
}
p->current_essence_track_position =
gst_util_uint64_scale (start, p->material_track->edit_rate.n,
p->material_track->edit_rate.d * GST_SECOND);
p->current_essence_track_position +=
gst_util_uint64_scale (start,
p->current_essence_track->source_track->edit_rate.n,
p->current_essence_track->source_track->edit_rate.d * GST_SECOND);
if (p->current_essence_track_position >= p->current_essence_track->duration
&& p->current_essence_track->duration > 0) {
p->eos = TRUE;
p->current_essence_track_position = p->current_component->parent.duration;
p->current_essence_track_position = p->current_essence_track->duration;
p->last_stop =
sum + gst_util_uint64_scale (p->current_component->parent.duration,
p->material_track->edit_rate.d * GST_SECOND,
@ -3174,8 +3197,9 @@ gst_mxf_demux_seek_pull (GstMXFDemux * demux, GstEvent * event)
if (position != p->current_essence_track_position) {
p->last_flow -=
gst_util_uint64_scale (p->current_essence_track_position -
position, GST_SECOND * p->material_track->edit_rate.d,
p->material_track->edit_rate.d);
position,
GST_SECOND * p->current_essence_track->source_track->edit_rate.d,
p->current_essence_track->source_track->edit_rate.d);
}
p->current_essence_track_position = position;
}

1
gst/mxf/mxfdemux.h
View file

@ -109,6 +109,7 @@ struct _GstMXFDemuxPad
MXFMetadataSourceClip *current_component;
gint64 current_component_start;
gint64 current_component_duration;
GstMXFDemuxEssenceTrack *current_essence_track;
gint64 current_essence_track_position;