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fabf948194
Otherwise it happens that SCTE events can only be scheduled up to 15 seconds since the last seen PCR, which is a useless restriction. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2021>
393 lines
12 KiB
C
393 lines
12 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 <gst/mpegts/mpegts.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_DISCONTINUITY_FLAG 0x80
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#define MPEGTS_AFC_RANDOM_ACCESS_FLAG 0x40
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#define MPEGTS_AFC_ELEMENTARY_STREAM_PRIORITY 0x20
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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 MPEGTS_AFC_SPLICING_POINT_FLAG 0x04
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#define MPEGTS_AFC_TRANSPORT_PRIVATE_DATA_FLAG 0x02
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#define MPEGTS_AFC_EXTENSION_FLAG 0x01
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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
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{
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guint16 pid;
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guint continuity_counter;
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/* Section data (always newly allocated) */
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guint8 *section_data;
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/* Current offset in section_data */
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guint16 section_offset;
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/* Values for pending section */
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/* table_id of the pending section_data */
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guint8 table_id;
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guint section_length;
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guint8 version_number;
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guint16 subtable_extension;
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guint8 section_number;
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guint8 last_section_number;
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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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/* Maximum number of MpegTSPcr
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* 256 should be sufficient for most multiplexes */
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#define MAX_PCR_OBS_CHANNELS 256
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/* PCR/offset structure */
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typedef struct _PCROffset
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{
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/* PCR value (units: 1/27MHz) */
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guint64 pcr;
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/* The offset (units: bytes) */
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guint64 offset;
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} PCROffset;
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/* Flags used on groups */
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enum
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{
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/* Closed groups: There is a contiguous next group */
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PCR_GROUP_FLAG_CLOSED = 1 << 0,
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/* estimated: the pcr_offset has been estimated and is not
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* guaranteed to be 100% accurate */
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PCR_GROUP_FLAG_ESTIMATED = 1 << 1,
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/* reset: there is a pcr reset between the end of this
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* group and the next one.
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* This flag is exclusive with CLOSED. */
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PCR_GROUP_FLAG_RESET = 1 << 2,
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/* reset: there is a pcr wrapover between the end of this
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* group and the next one.
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* This flag is exclusive with CLOSED. */
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PCR_GROUP_FLAG_WRAPOVER = 1 << 3
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};
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/* PCROffsetGroup: A group of PCR observations.
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* All values in a group have got the same reference pcr and
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* byte offset (first_pcr/first_offset).
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*/
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#define DEFAULT_ALLOCATED_OFFSET 16
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typedef struct _PCROffsetGroup
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{
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/* Flags (see PCR_GROUP_FLAG_* above) */
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guint flags;
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/* First raw PCR of this group. Units: 1/27MHz.
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* All values[].pcr are differences against first_pcr */
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guint64 first_pcr;
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/* Offset of this group in bytes.
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* All values[].offset are differences against first_offset */
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guint64 first_offset;
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/* Dynamically allocated table of PCROffset */
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PCROffset *values;
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/* number of PCROffset allocated in values */
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guint nb_allocated;
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/* number of *actual* PCROffset contained in values */
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guint last_value;
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/* Offset since the very first PCR value observed in the whole
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* stream. Units: 1/27MHz.
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* This will take into account gaps/wraparounds/resets/... and is
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* used to determine running times.
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* The value is only guaranteed to be 100% accurate if the group
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* does not have the ESTIMATED flag.
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* If the value is estimated, the pcr_offset shall be recalculated
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* (based on previous groups) whenever it is accessed.
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*/
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guint64 pcr_offset;
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/* FIXME : Cache group bitrate ? */
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} PCROffsetGroup;
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/* Number of PCRs needed before bitrate estimation can start */
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/* Note: the reason we use 10 is because PCR should normally be
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* received at least every 100ms so this gives us close to
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* a 1s moving window to calculate bitrate */
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#define PCR_BITRATE_NEEDED 10
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/* PCROffsetCurrent: The PCR/Offset window iterator
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* This is used to estimate/observe incoming PCR/offset values
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* Points to a group (which it is filling) */
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typedef struct _PCROffsetCurrent
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{
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/* The PCROffsetGroup we are filling.
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* If NULL, a group needs to be identified */
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PCROffsetGroup *group;
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/* Table of pending values we are iterating over */
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PCROffset pending[PCR_BITRATE_NEEDED];
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/* base offset/pcr from the group */
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guint64 first_pcr;
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guint64 first_offset;
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/* The previous reference PCROffset
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* This corresponds to the last entry of the group we are filling
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* and is used to calculate prev_bitrate */
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PCROffset prev;
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/* The last PCROffset in pending[] */
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PCROffset last_value;
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/* Location of first pending PCR/offset observation in pending */
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guint first;
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/* Location of last pending PCR/offset observation in pending */
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guint last;
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/* Location of next write in pending */
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guint write;
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/* bitrate is always in bytes per second */
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/* cur_bitrate is the bitrate of the pending values: d(last-first) */
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guint64 cur_bitrate;
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/* prev_bitrate is the bitrate between reference PCROffset
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* and the first pending value. Used to detect changes
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* in bitrate */
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guint64 prev_bitrate;
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} PCROffsetCurrent;
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typedef struct _MpegTSPCR
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{
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guint16 pid;
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/* Following variables are only active/used when
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* calculate_skew is TRUE */
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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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/* Offset to apply to PCR to handle wraparounds */
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guint64 pcroffset;
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/* Used for bitrate calculation */
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/* List of PCR/offset observations */
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GList *groups;
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/* Current PCR/offset observations (used to update pcroffsets) */
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PCROffsetCurrent *current;
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} MpegTSPCR;
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struct _MpegTSPacketizer2 {
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GObject parent;
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GMutex group_lock;
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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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guint16 packet_size;
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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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/* Shortcuts for adapter usage */
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guint8 *map_data;
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gsize map_offset;
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gsize map_size;
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gboolean need_sync;
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/* Reference offset */
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guint64 refoffset;
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/* Number of seen pcr/offset observations (FIXME : kill later) */
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guint nb_seen_offsets;
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/* Last inputted timestamp */
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GstClockTime last_in_time;
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/* offset to observations table */
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guint8 pcrtablelut[0x2000];
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MpegTSPCR *observations[MAX_PCR_OBS_CHANNELS];
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guint8 lastobsid;
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GstClockTime pcr_discont_threshold;
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/* PTS/DTS of last buffer */
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GstClockTime last_pts;
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GstClockTime last_dts;
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/* Extra time offset to handle values before initial PCR.
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* This will be added to all converted timestamps */
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GstClockTime extra_shift;
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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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#define FLAGS_SCRAMBLED(f) (f & 0xc0)
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#define FLAGS_HAS_AFC(f) (f & 0x20)
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#define FLAGS_HAS_PAYLOAD(f) (f & 0x10)
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#define FLAGS_CONTINUITY_COUNTER(f) (f & 0x0f)
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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 scram_afc_cc;
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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 offset;
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} MpegTSPacketizerPacket;
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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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guint8 last_section_number;
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/* table of bits, whether the section was seen or not.
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* Use MPEGTS_BIT_* macros to check */
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/* Size is 32, because there's a maximum of 256 (32*8) section_number */
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guint8 seen_section[32];
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} MpegTSPacketizerStreamSubtable;
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#define MPEGTS_BIT_SET(field, offs) ((field)[(offs) >> 3] |= (1 << ((offs) & 0x7)))
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#define MPEGTS_BIT_UNSET(field, offs) ((field)[(offs) >> 3] &= ~(1 << ((offs) & 0x7)))
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#define MPEGTS_BIT_IS_SET(field, offs) ((field)[(offs) >> 3] & (1 << ((offs) & 0x7)))
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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 GstMpegtsSection *mpegts_packetizer_push_section (MpegTSPacketizer2 *packetzer,
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MpegTSPacketizerPacket *packet, GList **remaining);
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/* Only valid if calculate_offset is TRUE */
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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 GstClockTime
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mpegts_packetizer_pts_to_ts_unchecked (MpegTSPacketizer2 * packetizer,
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GstClockTime pts, guint16 pcr_pid);
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G_GNUC_INTERNAL GstClockTime
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mpegts_packetizer_get_current_time (MpegTSPacketizer2 * packetizer,
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guint16 pcr_pid);
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G_GNUC_INTERNAL void
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mpegts_packetizer_set_current_pcr_offset (MpegTSPacketizer2 * packetizer,
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GstClockTime offset, 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_GNUC_INTERNAL void
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mpegts_packetizer_set_pcr_discont_threshold (MpegTSPacketizer2 * packetizer,
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GstClockTime threshold);
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G_END_DECLS
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#endif /* GST_MPEGTS_PACKETIZER_H */
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