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1fd094d96b
Some buffers can have multiple moov atoms inside and the strategy of using the gst_adapter_prev_pts timestamp to get the base timestamp for the media of the fragment would fail as it would reuse the same base timestamp for all moofs in the buffer instead of accumulating the durations for all of them. Heres a better explanation of the issue: qtdemux receives a buffer where PTS(buf) = X buf -> moofA | moofB | moofC The problem was that PTS(buf) was used as the base timestamp for all 3 moofs, causing all buffers to be X based. In this case we want only moofA to be X based as it is what the PTS on buf means, and the other moofB and moofC just use the accumulated timestamp from the previous moofs durations. To solve this, this patch uses gst_adapter_prev_pts distance result, this allows qtdemux to calculate if it should use the resulting pts or just accumulate the samples as it can identify if the moofs belong to the same upstream buffer or not. https://bugzilla.gnome.org/show_bug.cgi?id=719783
152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_QTDEMUX_H__
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#define __GST_QTDEMUX_H__
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#include <gst/gst.h>
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#include <gst/base/gstadapter.h>
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G_BEGIN_DECLS
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GST_DEBUG_CATEGORY_EXTERN (qtdemux_debug);
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#define GST_CAT_DEFAULT qtdemux_debug
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#define GST_TYPE_QTDEMUX \
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(gst_qtdemux_get_type())
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#define GST_QTDEMUX(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_QTDEMUX,GstQTDemux))
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#define GST_QTDEMUX_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_QTDEMUX,GstQTDemuxClass))
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#define GST_IS_QTDEMUX(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_QTDEMUX))
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#define GST_IS_QTDEMUX_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_QTDEMUX))
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#define GST_QTDEMUX_CAST(obj) ((GstQTDemux *)(obj))
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/* qtdemux produces these for atoms it cannot parse */
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#define GST_QT_DEMUX_PRIVATE_TAG "private-qt-tag"
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#define GST_QT_DEMUX_CLASSIFICATION_TAG "classification"
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#define GST_QTDEMUX_MAX_STREAMS 32
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typedef struct _GstQTDemux GstQTDemux;
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typedef struct _GstQTDemuxClass GstQTDemuxClass;
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typedef struct _QtDemuxStream QtDemuxStream;
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struct _GstQTDemux {
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GstElement element;
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/* pads */
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GstPad *sinkpad;
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QtDemuxStream *streams[GST_QTDEMUX_MAX_STREAMS];
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gint n_streams;
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gint n_video_streams;
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gint n_audio_streams;
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gint n_sub_streams;
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gboolean have_group_id;
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guint group_id;
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guint major_brand;
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GstBuffer *comp_brands;
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GNode *moov_node;
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GNode *moov_node_compressed;
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guint32 timescale;
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guint64 duration;
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gboolean fragmented;
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/* offset of the mfra atom */
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guint64 mfra_offset;
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guint64 moof_offset;
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gint state;
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gboolean pullbased;
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gboolean posted_redirect;
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/* push based variables */
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guint neededbytes;
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guint todrop;
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GstAdapter *adapter;
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GstBuffer *mdatbuffer;
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guint64 mdatleft;
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/* When restoring the mdat to the adatpter, this buffer
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* stores any trailing data that was after the last atom parsed as it
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* has to be restored later along with the correct offset. Used in
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* fragmented scenario where mdat/moof are one after the other
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* in any order.
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*
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* Check https://bugzilla.gnome.org/show_bug.cgi?id=710623 */
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GstBuffer *restoredata_buffer;
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guint64 restoredata_offset;
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guint64 offset;
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/* offset of the mdat atom */
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guint64 mdatoffset;
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guint64 first_mdat;
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gboolean got_moov;
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guint64 last_moov_offset;
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guint header_size;
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GstTagList *tag_list;
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/* configured playback region */
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GstSegment segment;
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GstEvent *pending_newsegment;
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gboolean upstream_newsegment;
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gint64 seek_offset;
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gint64 push_seek_start;
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gint64 push_seek_stop;
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#if 0
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/* gst index support */
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GstIndex *element_index;
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gint index_id;
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#endif
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gboolean upstream_seekable;
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gint64 upstream_size;
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/* MSS streams have a single media that is unspecified at the atoms, so
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* upstream provides it at the caps */
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GstCaps *media_caps;
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gboolean exposed;
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gboolean mss_mode; /* flag to indicate that we're working with a smoothstreaming fragment */
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guint64 fragment_start;
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guint64 fragment_start_offset;
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gint64 chapters_track_id;
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GstClockTime min_elst_offset;
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};
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struct _GstQTDemuxClass {
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GstElementClass parent_class;
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};
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GType gst_qtdemux_get_type (void);
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G_END_DECLS
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#endif /* __GST_QTDEMUX_H__ */
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