/* * mpegtspacketizer.h - * Copyright (C) 2007 Alessandro Decina * * Authors: * Alessandro Decina * * 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 #include #include #include #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 */