gstreamer/gst/mpegtsdemux/mpegtspacketizer.h
Edward Hervey c6035d403c mpegtspacketizer: Avoid usage of GstBuffer internally
The overhead of creating/using 188 byte GstBuffer from GstAdapter
is too expensive.
We now peek the next packet, and provide a data/size which is only
valid until the packetizerpacket is cleared.

In addition, cleanup all the internal code to deal with that new
behaviour and remove double-checks which are no longer needed.

The section_length is now the corrected section_length (i.e. with
the additional 3 bytes).

Avoid using gst_adapter_prev_timestamp and instead track
the timestamp ourself.
2012-05-22 17:43:38 +02:00

225 lines
6.7 KiB
C

/*
* mpegtspacketizer.h -
* Copyright (C) 2007 Alessandro Decina
*
* Authors:
* Alessandro Decina <alessandro@nnva.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef GST_MPEGTS_PACKETIZER_H
#define GST_MPEGTS_PACKETIZER_H
#include <gst/gst.h>
#include <gst/base/gstadapter.h>
#include <glib.h>
#include "gstmpegdefs.h"
#define MPEGTS_NORMAL_PACKETSIZE 188
#define MPEGTS_M2TS_PACKETSIZE 192
#define MPEGTS_DVB_ASI_PACKETSIZE 204
#define MPEGTS_ATSC_PACKETSIZE 208
#define MPEGTS_MIN_PACKETSIZE MPEGTS_NORMAL_PACKETSIZE
#define MPEGTS_MAX_PACKETSIZE MPEGTS_ATSC_PACKETSIZE
#define MPEGTS_AFC_PCR_FLAG 0x10
#define MPEGTS_AFC_OPCR_FLAG 0x08
#define MAX_WINDOW 512
G_BEGIN_DECLS
#define GST_TYPE_MPEGTS_PACKETIZER \
(mpegts_packetizer_get_type())
#define GST_MPEGTS_PACKETIZER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MPEGTS_PACKETIZER,MpegTSPacketizer2))
#define GST_MPEGTS_PACKETIZER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MPEGTS_PACKETIZER,MpegTSPacketizer2Class))
#define GST_IS_MPEGTS_PACKETIZER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MPEGTS_PACKETIZER))
#define GST_IS_MPEGTS_PACKETIZER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MPEGTS_PACKETIZER))
typedef struct _MpegTSPacketizer2 MpegTSPacketizer2;
typedef struct _MpegTSPacketizer2Class MpegTSPacketizer2Class;
typedef struct _MpegTSPacketizerPrivate MpegTSPacketizerPrivate;
typedef struct
{
guint continuity_counter;
guint8 *section_data;
guint section_length;
guint16 section_offset;
guint8 section_table_id;
GSList *subtables;
/* Offset of the data contained in the section */
guint64 offset;
} MpegTSPacketizerStream;
struct _MpegTSPacketizer2 {
GObject parent;
GstAdapter *adapter;
/* streams hashed by pid */
/* FIXME : be more memory efficient (see how it's done in mpegtsbase) */
MpegTSPacketizerStream **streams;
gboolean disposed;
gboolean know_packet_size;
guint16 packet_size;
GstCaps *caps;
/* current offset of the tip of the adapter */
guint64 offset;
gboolean empty;
/* clock skew calculation */
gboolean calculate_skew;
/* Following variables are only active/used when
* calculate_skew is TRUE */
/* FIXME : These variables should be *per* PCR PID */
GstClockTime base_time;
GstClockTime base_pcrtime;
GstClockTime prev_out_time;
GstClockTime prev_in_time;
GstClockTime last_pcrtime;
gint64 window[MAX_WINDOW];
guint window_pos;
guint window_size;
gboolean window_filling;
gint64 window_min;
gint64 skew;
gint64 prev_send_diff;
gint wrap_count;
/* offset/bitrate calculator */
gboolean calculate_offset;
MpegTSPacketizerPrivate *priv;
};
struct _MpegTSPacketizer2Class {
GObjectClass object_class;
};
typedef struct
{
gint16 pid;
guint8 payload_unit_start_indicator;
guint8 adaptation_field_control;
guint8 continuity_counter;
guint8 *payload;
guint8 *data_start;
guint8 *data_end;
guint8 *data;
guint8 afc_flags;
guint64 pcr;
guint64 opcr;
guint64 offset;
GstClockTime origts;
} MpegTSPacketizerPacket;
typedef struct
{
gboolean complete;
/* GstBuffer *buffer; */
guint8 *data;
guint section_length;
guint64 offset;
gint16 pid;
guint8 table_id;
guint16 subtable_extension;
guint8 version_number;
guint8 current_next_indicator;
guint32 crc;
} MpegTSPacketizerSection;
typedef struct
{
guint8 table_id;
/* the spec says sub_table_extension is the fourth and fifth byte of a
* section when the section_syntax_indicator is set to a value of "1". If
* section_syntax_indicator is 0, sub_table_extension will be set to 0 */
guint16 subtable_extension;
guint8 version_number;
guint32 crc;
} MpegTSPacketizerStreamSubtable;
typedef enum {
PACKET_BAD = FALSE,
PACKET_OK = TRUE,
PACKET_NEED_MORE
} MpegTSPacketizerPacketReturn;
GType mpegts_packetizer_get_type(void);
MpegTSPacketizer2 *mpegts_packetizer_new (void);
void mpegts_packetizer_clear (MpegTSPacketizer2 *packetizer);
void mpegts_packetizer_flush (MpegTSPacketizer2 *packetizer);
void mpegts_packetizer_push (MpegTSPacketizer2 *packetizer, GstBuffer *buffer);
gboolean mpegts_packetizer_has_packets (MpegTSPacketizer2 *packetizer);
MpegTSPacketizerPacketReturn mpegts_packetizer_next_packet (MpegTSPacketizer2 *packetizer,
MpegTSPacketizerPacket *packet);
MpegTSPacketizerPacketReturn
mpegts_packetizer_process_next_packet(MpegTSPacketizer2 * packetizer);
void mpegts_packetizer_clear_packet (MpegTSPacketizer2 *packetizer,
MpegTSPacketizerPacket *packet);
void mpegts_packetizer_remove_stream(MpegTSPacketizer2 *packetizer,
gint16 pid);
gboolean mpegts_packetizer_push_section (MpegTSPacketizer2 *packetzer,
MpegTSPacketizerPacket *packet, MpegTSPacketizerSection *section);
GstStructure *mpegts_packetizer_parse_pat (MpegTSPacketizer2 *packetizer,
MpegTSPacketizerSection *section);
GstStructure *mpegts_packetizer_parse_pmt (MpegTSPacketizer2 *packetizer,
MpegTSPacketizerSection *section);
GstStructure *mpegts_packetizer_parse_nit (MpegTSPacketizer2 *packetizer,
MpegTSPacketizerSection *section);
GstStructure *mpegts_packetizer_parse_sdt (MpegTSPacketizer2 *packetizer,
MpegTSPacketizerSection *section);
GstStructure *mpegts_packetizer_parse_eit (MpegTSPacketizer2 *packetizer,
MpegTSPacketizerSection *section);
GstStructure *mpegts_packetizer_parse_tdt (MpegTSPacketizer2 *packetizer,
MpegTSPacketizerSection *section);
/* Only valid if calculate_offset is TRUE */
guint mpegts_packetizer_get_seen_pcr (MpegTSPacketizer2 *packetizer);
GstClockTime
mpegts_packetizer_offset_to_ts (MpegTSPacketizer2 * packetizer,
guint64 offset);
guint64
mpegts_packetizer_ts_to_offset (MpegTSPacketizer2 * packetizer,
GstClockTime ts);
GstClockTime
mpegts_packetizer_pts_to_ts (MpegTSPacketizer2 * packetizer,
GstClockTime pts);
void
mpegts_packetizer_set_reference_offset (MpegTSPacketizer2 * packetizer,
guint64 refoffset);
G_END_DECLS
#endif /* GST_MPEGTS_PACKETIZER_H */