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0592bcc3c9
In some cases (NIT on highly-populated DVB-C operator for example), there will be more than one section emitted for the same subtable and version number. In order not to lose those updates for the same version number, we checked against the CRC of the previous section we parsed. The problem is that, while it made sure we didn't lose any information, it also meant that if the same section came back (same version, same CRC) later on we would re-process it, re-parse it and re-emit it. This version improves on that by keeping a list of previously observed CRC for identical PID/subtable/version-number and will only process sections if they really were never seen in the past (as opposed to just before). On a 30s clip, this brings down the number of NIT section parsing from 4541 down to 663. https://bugzilla.gnome.org/show_bug.cgi?id=614479
218 lines
7.1 KiB
C
218 lines
7.1 KiB
C
/*
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* mpegtspacketizer.h -
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* Copyright (C) 2007 Alessandro Decina
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*
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* Authors:
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* Alessandro Decina <alessandro@nnva.org>
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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_MPEGTS_PACKETIZER_H
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#define GST_MPEGTS_PACKETIZER_H
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#include <gst/gst.h>
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#include <gst/base/gstadapter.h>
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#include <glib.h>
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#include "gstmpegdefs.h"
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#define MPEGTS_NORMAL_PACKETSIZE 188
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#define MPEGTS_M2TS_PACKETSIZE 192
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#define MPEGTS_DVB_ASI_PACKETSIZE 204
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#define MPEGTS_ATSC_PACKETSIZE 208
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#define MPEGTS_MIN_PACKETSIZE MPEGTS_NORMAL_PACKETSIZE
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#define MPEGTS_MAX_PACKETSIZE MPEGTS_ATSC_PACKETSIZE
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#define MPEGTS_AFC_PCR_FLAG 0x10
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#define MPEGTS_AFC_OPCR_FLAG 0x08
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#define MAX_WINDOW 512
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G_BEGIN_DECLS
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#define GST_TYPE_MPEGTS_PACKETIZER \
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(mpegts_packetizer_get_type())
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#define GST_MPEGTS_PACKETIZER(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MPEGTS_PACKETIZER,MpegTSPacketizer2))
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#define GST_MPEGTS_PACKETIZER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MPEGTS_PACKETIZER,MpegTSPacketizer2Class))
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#define GST_IS_MPEGTS_PACKETIZER(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MPEGTS_PACKETIZER))
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#define GST_IS_MPEGTS_PACKETIZER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MPEGTS_PACKETIZER))
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typedef struct _MpegTSPacketizer2 MpegTSPacketizer2;
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typedef struct _MpegTSPacketizer2Class MpegTSPacketizer2Class;
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typedef struct _MpegTSPacketizerPrivate MpegTSPacketizerPrivate;
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typedef struct
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{
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guint continuity_counter;
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/* Section data (reused) */
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guint8 *section_data;
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/* Expected length of the section */
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guint section_length;
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/* Allocated length of section_data */
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guint section_allocated;
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/* Current offset in section_data */
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guint16 section_offset;
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/* table_id of the pending section_data */
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guint8 section_table_id;
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GSList *subtables;
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/* Upstream offset of the data contained in the section */
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guint64 offset;
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} MpegTSPacketizerStream;
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struct _MpegTSPacketizer2 {
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GObject parent;
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GstAdapter *adapter;
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/* streams hashed by pid */
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/* FIXME : be more memory efficient (see how it's done in mpegtsbase) */
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MpegTSPacketizerStream **streams;
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gboolean disposed;
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gboolean know_packet_size;
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guint16 packet_size;
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GstCaps *caps;
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/* current offset of the tip of the adapter */
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guint64 offset;
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gboolean empty;
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/* clock skew calculation */
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gboolean calculate_skew;
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/* offset/bitrate calculator */
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gboolean calculate_offset;
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MpegTSPacketizerPrivate *priv;
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};
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struct _MpegTSPacketizer2Class {
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GObjectClass object_class;
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};
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typedef struct
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{
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gint16 pid;
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guint8 payload_unit_start_indicator;
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guint8 adaptation_field_control;
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guint8 continuity_counter;
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guint8 *payload;
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guint8 *data_start;
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guint8 *data_end;
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guint8 *data;
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guint8 afc_flags;
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guint64 pcr;
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guint64 opcr;
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guint64 offset;
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GstClockTime origts;
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} MpegTSPacketizerPacket;
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typedef struct
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{
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gboolean complete;
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/* GstBuffer *buffer; */
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guint8 *data;
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guint section_length;
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guint64 offset;
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gint16 pid;
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guint8 table_id;
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guint16 subtable_extension;
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guint8 version_number;
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guint8 current_next_indicator;
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guint32 crc;
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} MpegTSPacketizerSection;
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typedef struct
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{
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guint8 table_id;
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/* the spec says sub_table_extension is the fourth and fifth byte of a
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* section when the section_syntax_indicator is set to a value of "1". If
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* section_syntax_indicator is 0, sub_table_extension will be set to 0 */
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guint16 subtable_extension;
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guint8 version_number;
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GList * crc;
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} MpegTSPacketizerStreamSubtable;
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typedef enum {
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PACKET_BAD = FALSE,
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PACKET_OK = TRUE,
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PACKET_NEED_MORE
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} MpegTSPacketizerPacketReturn;
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G_GNUC_INTERNAL GType mpegts_packetizer_get_type(void);
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G_GNUC_INTERNAL MpegTSPacketizer2 *mpegts_packetizer_new (void);
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G_GNUC_INTERNAL void mpegts_packetizer_clear (MpegTSPacketizer2 *packetizer);
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G_GNUC_INTERNAL void mpegts_packetizer_flush (MpegTSPacketizer2 *packetizer, gboolean hard);
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G_GNUC_INTERNAL void mpegts_packetizer_push (MpegTSPacketizer2 *packetizer, GstBuffer *buffer);
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G_GNUC_INTERNAL gboolean mpegts_packetizer_has_packets (MpegTSPacketizer2 *packetizer);
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G_GNUC_INTERNAL MpegTSPacketizerPacketReturn mpegts_packetizer_next_packet (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerPacket *packet);
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G_GNUC_INTERNAL MpegTSPacketizerPacketReturn
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mpegts_packetizer_process_next_packet(MpegTSPacketizer2 * packetizer);
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G_GNUC_INTERNAL void mpegts_packetizer_clear_packet (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerPacket *packet);
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G_GNUC_INTERNAL void mpegts_packetizer_remove_stream(MpegTSPacketizer2 *packetizer,
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gint16 pid);
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G_GNUC_INTERNAL gboolean mpegts_packetizer_push_section (MpegTSPacketizer2 *packetzer,
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MpegTSPacketizerPacket *packet, MpegTSPacketizerSection *section);
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G_GNUC_INTERNAL GstStructure *mpegts_packetizer_parse_cat (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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G_GNUC_INTERNAL GstStructure *mpegts_packetizer_parse_pat (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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G_GNUC_INTERNAL GstStructure *mpegts_packetizer_parse_pmt (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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G_GNUC_INTERNAL GstStructure *mpegts_packetizer_parse_nit (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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G_GNUC_INTERNAL GstStructure *mpegts_packetizer_parse_sdt (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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G_GNUC_INTERNAL GstStructure *mpegts_packetizer_parse_eit (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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G_GNUC_INTERNAL GstStructure *mpegts_packetizer_parse_tdt (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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G_GNUC_INTERNAL GstStructure *mpegts_packetizer_parse_tot (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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/* Only valid if calculate_offset is TRUE */
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G_GNUC_INTERNAL guint mpegts_packetizer_get_seen_pcr (MpegTSPacketizer2 *packetizer);
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G_GNUC_INTERNAL GstClockTime
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mpegts_packetizer_offset_to_ts (MpegTSPacketizer2 * packetizer,
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guint64 offset, guint16 pcr_pid);
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G_GNUC_INTERNAL guint64
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mpegts_packetizer_ts_to_offset (MpegTSPacketizer2 * packetizer,
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GstClockTime ts, guint16 pcr_pid);
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G_GNUC_INTERNAL GstClockTime
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mpegts_packetizer_pts_to_ts (MpegTSPacketizer2 * packetizer,
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GstClockTime pts, guint16 pcr_pid);
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G_GNUC_INTERNAL void
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mpegts_packetizer_set_reference_offset (MpegTSPacketizer2 * packetizer,
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guint64 refoffset);
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G_END_DECLS
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#endif /* GST_MPEGTS_PACKETIZER_H */
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