mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-23 18:21:04 +00:00
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>
392 lines
12 KiB
C
392 lines
12 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., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef GST_MPEGTS_PACKETIZER_H
|
|
#define GST_MPEGTS_PACKETIZER_H
|
|
|
|
#include <gst/gst.h>
|
|
#include <gst/base/gstadapter.h>
|
|
#include <glib.h>
|
|
|
|
#include <gst/mpegts/mpegts.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_DISCONTINUITY_FLAG 0x80
|
|
#define MPEGTS_AFC_RANDOM_ACCESS_FLAG 0x40
|
|
#define MPEGTS_AFC_ELEMENTARY_STREAM_PRIORITY 0x20
|
|
#define MPEGTS_AFC_PCR_FLAG 0x10
|
|
#define MPEGTS_AFC_OPCR_FLAG 0x08
|
|
#define MPEGTS_AFC_SPLICING_POINT_FLAG 0x04
|
|
#define MPEGTS_AFC_TRANSPORT_PRIVATE_DATA_FLAG 0x02
|
|
#define MPEGTS_AFC_EXTENSION_FLAG 0x01
|
|
|
|
#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
|
|
{
|
|
guint16 pid;
|
|
guint continuity_counter;
|
|
|
|
/* Section data (always newly allocated) */
|
|
guint8 *section_data;
|
|
/* Current offset in section_data */
|
|
guint16 section_offset;
|
|
|
|
/* Values for pending section */
|
|
/* table_id of the pending section_data */
|
|
guint8 table_id;
|
|
guint section_length;
|
|
guint8 version_number;
|
|
guint16 subtable_extension;
|
|
guint8 section_number;
|
|
guint8 last_section_number;
|
|
|
|
GSList *subtables;
|
|
|
|
/* Upstream offset of the data contained in the section */
|
|
guint64 offset;
|
|
} MpegTSPacketizerStream;
|
|
|
|
/* Maximum number of MpegTSPcr
|
|
* 256 should be sufficient for most multiplexes */
|
|
#define MAX_PCR_OBS_CHANNELS 256
|
|
|
|
/* PCR/offset structure */
|
|
typedef struct _PCROffset
|
|
{
|
|
/* PCR value (units: 1/27MHz) */
|
|
guint64 pcr;
|
|
|
|
/* The offset (units: bytes) */
|
|
guint64 offset;
|
|
} PCROffset;
|
|
|
|
/* Flags used on groups */
|
|
enum
|
|
{
|
|
/* Closed groups: There is a contiguous next group */
|
|
PCR_GROUP_FLAG_CLOSED = 1 << 0,
|
|
/* estimated: the pcr_offset has been estimated and is not
|
|
* guaranteed to be 100% accurate */
|
|
PCR_GROUP_FLAG_ESTIMATED = 1 << 1,
|
|
/* reset: there is a pcr reset between the end of this
|
|
* group and the next one.
|
|
* This flag is exclusive with CLOSED. */
|
|
PCR_GROUP_FLAG_RESET = 1 << 2,
|
|
/* reset: there is a pcr wrapover between the end of this
|
|
* group and the next one.
|
|
* This flag is exclusive with CLOSED. */
|
|
PCR_GROUP_FLAG_WRAPOVER = 1 << 3
|
|
};
|
|
|
|
|
|
|
|
/* PCROffsetGroup: A group of PCR observations.
|
|
* All values in a group have got the same reference pcr and
|
|
* byte offset (first_pcr/first_offset).
|
|
*/
|
|
#define DEFAULT_ALLOCATED_OFFSET 16
|
|
typedef struct _PCROffsetGroup
|
|
{
|
|
/* Flags (see PCR_GROUP_FLAG_* above) */
|
|
guint flags;
|
|
|
|
/* First raw PCR of this group. Units: 1/27MHz.
|
|
* All values[].pcr are differences against first_pcr */
|
|
guint64 first_pcr;
|
|
/* Offset of this group in bytes.
|
|
* All values[].offset are differences against first_offset */
|
|
guint64 first_offset;
|
|
|
|
/* Dynamically allocated table of PCROffset */
|
|
PCROffset *values;
|
|
/* number of PCROffset allocated in values */
|
|
guint nb_allocated;
|
|
/* number of *actual* PCROffset contained in values */
|
|
guint last_value;
|
|
|
|
/* Offset since the very first PCR value observed in the whole
|
|
* stream. Units: 1/27MHz.
|
|
* This will take into account gaps/wraparounds/resets/... and is
|
|
* used to determine running times.
|
|
* The value is only guaranteed to be 100% accurate if the group
|
|
* does not have the ESTIMATED flag.
|
|
* If the value is estimated, the pcr_offset shall be recalculated
|
|
* (based on previous groups) whenever it is accessed.
|
|
*/
|
|
guint64 pcr_offset;
|
|
|
|
/* FIXME : Cache group bitrate ? */
|
|
} PCROffsetGroup;
|
|
|
|
/* Number of PCRs needed before bitrate estimation can start */
|
|
/* Note: the reason we use 10 is because PCR should normally be
|
|
* received at least every 100ms so this gives us close to
|
|
* a 1s moving window to calculate bitrate */
|
|
#define PCR_BITRATE_NEEDED 10
|
|
|
|
/* PCROffsetCurrent: The PCR/Offset window iterator
|
|
* This is used to estimate/observe incoming PCR/offset values
|
|
* Points to a group (which it is filling) */
|
|
typedef struct _PCROffsetCurrent
|
|
{
|
|
/* The PCROffsetGroup we are filling.
|
|
* If NULL, a group needs to be identified */
|
|
PCROffsetGroup *group;
|
|
|
|
/* Table of pending values we are iterating over */
|
|
PCROffset pending[PCR_BITRATE_NEEDED];
|
|
|
|
/* base offset/pcr from the group */
|
|
guint64 first_pcr;
|
|
guint64 first_offset;
|
|
|
|
/* The previous reference PCROffset
|
|
* This corresponds to the last entry of the group we are filling
|
|
* and is used to calculate prev_bitrate */
|
|
PCROffset prev;
|
|
|
|
/* The last PCROffset in pending[] */
|
|
PCROffset last_value;
|
|
|
|
/* Location of first pending PCR/offset observation in pending */
|
|
guint first;
|
|
/* Location of last pending PCR/offset observation in pending */
|
|
guint last;
|
|
/* Location of next write in pending */
|
|
guint write;
|
|
|
|
/* bitrate is always in bytes per second */
|
|
|
|
/* cur_bitrate is the bitrate of the pending values: d(last-first) */
|
|
guint64 cur_bitrate;
|
|
|
|
/* prev_bitrate is the bitrate between reference PCROffset
|
|
* and the first pending value. Used to detect changes
|
|
* in bitrate */
|
|
guint64 prev_bitrate;
|
|
} PCROffsetCurrent;
|
|
|
|
typedef struct _MpegTSPCR
|
|
{
|
|
guint16 pid;
|
|
|
|
/* Following variables are only active/used when
|
|
* calculate_skew is TRUE */
|
|
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;
|
|
|
|
/* Offset to apply to PCR to handle wraparounds */
|
|
guint64 pcroffset;
|
|
|
|
/* Used for bitrate calculation */
|
|
/* List of PCR/offset observations */
|
|
GList *groups;
|
|
|
|
/* Current PCR/offset observations (used to update pcroffsets) */
|
|
PCROffsetCurrent *current;
|
|
} MpegTSPCR;
|
|
|
|
struct _MpegTSPacketizer2 {
|
|
GObject parent;
|
|
|
|
GMutex group_lock;
|
|
|
|
GstAdapter *adapter;
|
|
/* streams hashed by pid */
|
|
/* FIXME : be more memory efficient (see how it's done in mpegtsbase) */
|
|
MpegTSPacketizerStream **streams;
|
|
gboolean disposed;
|
|
guint16 packet_size;
|
|
|
|
/* current offset of the tip of the adapter */
|
|
guint64 offset;
|
|
gboolean empty;
|
|
|
|
/* clock skew calculation */
|
|
gboolean calculate_skew;
|
|
|
|
/* offset/bitrate calculator */
|
|
gboolean calculate_offset;
|
|
|
|
/* Shortcuts for adapter usage */
|
|
guint8 *map_data;
|
|
gsize map_offset;
|
|
gsize map_size;
|
|
gboolean need_sync;
|
|
|
|
/* Reference offset */
|
|
guint64 refoffset;
|
|
|
|
/* Number of seen pcr/offset observations (FIXME : kill later) */
|
|
guint nb_seen_offsets;
|
|
|
|
/* Last inputted timestamp */
|
|
GstClockTime last_in_time;
|
|
|
|
/* offset to observations table */
|
|
guint8 pcrtablelut[0x2000];
|
|
MpegTSPCR *observations[MAX_PCR_OBS_CHANNELS];
|
|
guint8 lastobsid;
|
|
GstClockTime pcr_discont_threshold;
|
|
|
|
/* PTS/DTS of last buffer */
|
|
GstClockTime last_pts;
|
|
GstClockTime last_dts;
|
|
|
|
/* Extra time offset to handle values before initial PCR.
|
|
* This will be added to all converted timestamps */
|
|
GstClockTime extra_shift;
|
|
};
|
|
|
|
struct _MpegTSPacketizer2Class {
|
|
GObjectClass object_class;
|
|
};
|
|
|
|
#define FLAGS_SCRAMBLED(f) (f & 0xc0)
|
|
#define FLAGS_HAS_AFC(f) (f & 0x20)
|
|
#define FLAGS_HAS_PAYLOAD(f) (f & 0x10)
|
|
#define FLAGS_CONTINUITY_COUNTER(f) (f & 0x0f)
|
|
|
|
typedef struct
|
|
{
|
|
gint16 pid;
|
|
guint8 payload_unit_start_indicator;
|
|
guint8 scram_afc_cc;
|
|
guint8 *payload;
|
|
|
|
guint8 *data_start;
|
|
guint8 *data_end;
|
|
guint8 *data;
|
|
|
|
guint8 afc_flags;
|
|
guint64 pcr;
|
|
guint64 offset;
|
|
} MpegTSPacketizerPacket;
|
|
|
|
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;
|
|
guint8 last_section_number;
|
|
/* table of bits, whether the section was seen or not.
|
|
* Use MPEGTS_BIT_* macros to check */
|
|
/* Size is 32, because there's a maximum of 256 (32*8) section_number */
|
|
guint8 seen_section[32];
|
|
} MpegTSPacketizerStreamSubtable;
|
|
|
|
#define MPEGTS_BIT_SET(field, offs) ((field)[(offs) >> 3] |= (1 << ((offs) & 0x7)))
|
|
#define MPEGTS_BIT_UNSET(field, offs) ((field)[(offs) >> 3] &= ~(1 << ((offs) & 0x7)))
|
|
#define MPEGTS_BIT_IS_SET(field, offs) ((field)[(offs) >> 3] & (1 << ((offs) & 0x7)))
|
|
|
|
typedef enum {
|
|
PACKET_BAD = FALSE,
|
|
PACKET_OK = TRUE,
|
|
PACKET_NEED_MORE
|
|
} MpegTSPacketizerPacketReturn;
|
|
|
|
G_GNUC_INTERNAL GType mpegts_packetizer_get_type(void);
|
|
|
|
G_GNUC_INTERNAL MpegTSPacketizer2 *mpegts_packetizer_new (void);
|
|
G_GNUC_INTERNAL void mpegts_packetizer_clear (MpegTSPacketizer2 *packetizer);
|
|
G_GNUC_INTERNAL void mpegts_packetizer_flush (MpegTSPacketizer2 *packetizer, gboolean hard);
|
|
G_GNUC_INTERNAL void mpegts_packetizer_push (MpegTSPacketizer2 *packetizer, GstBuffer *buffer);
|
|
G_GNUC_INTERNAL gboolean mpegts_packetizer_has_packets (MpegTSPacketizer2 *packetizer);
|
|
G_GNUC_INTERNAL MpegTSPacketizerPacketReturn mpegts_packetizer_next_packet (MpegTSPacketizer2 *packetizer,
|
|
MpegTSPacketizerPacket *packet);
|
|
G_GNUC_INTERNAL MpegTSPacketizerPacketReturn
|
|
mpegts_packetizer_process_next_packet(MpegTSPacketizer2 * packetizer);
|
|
G_GNUC_INTERNAL void mpegts_packetizer_clear_packet (MpegTSPacketizer2 *packetizer,
|
|
MpegTSPacketizerPacket *packet);
|
|
G_GNUC_INTERNAL void mpegts_packetizer_remove_stream(MpegTSPacketizer2 *packetizer,
|
|
gint16 pid);
|
|
|
|
G_GNUC_INTERNAL GstMpegtsSection *mpegts_packetizer_push_section (MpegTSPacketizer2 *packetzer,
|
|
MpegTSPacketizerPacket *packet, GList **remaining);
|
|
|
|
/* Only valid if calculate_offset is TRUE */
|
|
G_GNUC_INTERNAL GstClockTime
|
|
mpegts_packetizer_offset_to_ts (MpegTSPacketizer2 * packetizer,
|
|
guint64 offset, guint16 pcr_pid);
|
|
G_GNUC_INTERNAL guint64
|
|
mpegts_packetizer_ts_to_offset (MpegTSPacketizer2 * packetizer,
|
|
GstClockTime ts, guint16 pcr_pid);
|
|
G_GNUC_INTERNAL GstClockTime
|
|
mpegts_packetizer_pts_to_ts (MpegTSPacketizer2 * packetizer,
|
|
GstClockTime pts, guint16 pcr_pid);
|
|
G_GNUC_INTERNAL GstClockTime
|
|
mpegts_packetizer_pts_to_ts_unchecked (MpegTSPacketizer2 * packetizer,
|
|
GstClockTime pts, guint16 pcr_pid);
|
|
G_GNUC_INTERNAL GstClockTime
|
|
mpegts_packetizer_get_current_time (MpegTSPacketizer2 * packetizer,
|
|
guint16 pcr_pid);
|
|
G_GNUC_INTERNAL void
|
|
mpegts_packetizer_set_current_pcr_offset (MpegTSPacketizer2 * packetizer,
|
|
GstClockTime offset, guint16 pcr_pid);
|
|
G_GNUC_INTERNAL void
|
|
mpegts_packetizer_set_reference_offset (MpegTSPacketizer2 * packetizer,
|
|
guint64 refoffset);
|
|
G_GNUC_INTERNAL void
|
|
mpegts_packetizer_set_pcr_discont_threshold (MpegTSPacketizer2 * packetizer,
|
|
GstClockTime threshold);
|
|
G_END_DECLS
|
|
|
|
#endif /* GST_MPEGTS_PACKETIZER_H */
|