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/*
* 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_ACCES_FLAGS 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) */
guint32 pcr;
/* The offset (units: bytes) */
guint32 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;
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;
};
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 guint mpegts_packetizer_get_seen_pcr (MpegTSPacketizer2 *packetizer);
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 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_END_DECLS
#endif /* GST_MPEGTS_PACKETIZER_H */