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c6035d403c
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.
226 lines
6.7 KiB
C
226 lines
6.7 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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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guint8 *section_data;
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guint section_length;
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guint16 section_offset;
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guint8 section_table_id;
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GSList *subtables;
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/* 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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/* Following variables are only active/used when
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* calculate_skew is TRUE */
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/* FIXME : These variables should be *per* PCR PID */
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GstClockTime base_time;
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GstClockTime base_pcrtime;
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GstClockTime prev_out_time;
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GstClockTime prev_in_time;
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GstClockTime last_pcrtime;
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gint64 window[MAX_WINDOW];
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guint window_pos;
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guint window_size;
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gboolean window_filling;
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gint64 window_min;
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gint64 skew;
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gint64 prev_send_diff;
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gint wrap_count;
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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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guint32 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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GType mpegts_packetizer_get_type(void);
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MpegTSPacketizer2 *mpegts_packetizer_new (void);
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void mpegts_packetizer_clear (MpegTSPacketizer2 *packetizer);
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void mpegts_packetizer_flush (MpegTSPacketizer2 *packetizer);
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void mpegts_packetizer_push (MpegTSPacketizer2 *packetizer, GstBuffer *buffer);
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gboolean mpegts_packetizer_has_packets (MpegTSPacketizer2 *packetizer);
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MpegTSPacketizerPacketReturn mpegts_packetizer_next_packet (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerPacket *packet);
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MpegTSPacketizerPacketReturn
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mpegts_packetizer_process_next_packet(MpegTSPacketizer2 * packetizer);
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void mpegts_packetizer_clear_packet (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerPacket *packet);
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void mpegts_packetizer_remove_stream(MpegTSPacketizer2 *packetizer,
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gint16 pid);
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gboolean mpegts_packetizer_push_section (MpegTSPacketizer2 *packetzer,
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MpegTSPacketizerPacket *packet, MpegTSPacketizerSection *section);
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GstStructure *mpegts_packetizer_parse_pat (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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GstStructure *mpegts_packetizer_parse_pmt (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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GstStructure *mpegts_packetizer_parse_nit (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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GstStructure *mpegts_packetizer_parse_sdt (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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GstStructure *mpegts_packetizer_parse_eit (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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GstStructure *mpegts_packetizer_parse_tdt (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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/* Only valid if calculate_offset is TRUE */
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guint mpegts_packetizer_get_seen_pcr (MpegTSPacketizer2 *packetizer);
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GstClockTime
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mpegts_packetizer_offset_to_ts (MpegTSPacketizer2 * packetizer,
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guint64 offset);
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guint64
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mpegts_packetizer_ts_to_offset (MpegTSPacketizer2 * packetizer,
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GstClockTime ts);
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GstClockTime
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mpegts_packetizer_pts_to_ts (MpegTSPacketizer2 * packetizer,
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GstClockTime pts);
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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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