/* * mpegtsbase.h - GStreamer MPEG transport stream base class * Copyright (C) 2009 Edward Hervey * 2007 Alessandro Decina * Copyright (C) 2011, Hewlett-Packard Development Company, L.P. * Author: Youness Alaoui , Collabora Ltd. * Author: Sebastian Dröge , Collabora Ltd. * * Authors: * Alessandro Decina * Edward Hervey * * 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_MPEG_TS_BASE_H #define GST_MPEG_TS_BASE_H #include #include "mpegtspacketizer.h" G_BEGIN_DECLS #define GST_TYPE_MPEGTS_BASE \ (mpegts_base_get_type()) #define GST_MPEGTS_BASE(obj) \ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_MPEGTS_BASE,MpegTSBase)) #define GST_MPEGTS_BASE_CLASS(klass) \ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_MPEGTS_BASE,MpegTSBaseClass)) #define GST_IS_MPEGTS_BASE(obj) \ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_MPEGTS_BASE)) #define GST_IS_MPEGTS_BASE_CLASS(klass) \ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_MPEGTS_BASE)) #define GST_MPEGTS_BASE_GET_CLASS(obj) \ (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_MPEGTS_BASE, MpegTSBaseClass)) #define MPEG_TS_BASE_PACKETIZER(b) (((MpegTSBase*)b)->packetizer) typedef struct _MpegTSBase MpegTSBase; typedef struct _MpegTSBaseClass MpegTSBaseClass; typedef struct _MpegTSBaseStream MpegTSBaseStream; typedef struct _MpegTSBaseProgram MpegTSBaseProgram; struct _MpegTSBaseStream { guint16 pid; guint8 stream_type; /* Content of the registration descriptor (if present) */ guint32 registration_id; GstMpegtsPMTStream *stream; GstStream *stream_object; gchar *stream_id; }; struct _MpegTSBaseProgram { gint program_number; guint16 pmt_pid; guint16 pcr_pid; /* Content of the registration descriptor (if present) */ guint32 registration_id; GstMpegtsSection *section; const GstMpegtsPMT *pmt; MpegTSBaseStream **streams; GList *stream_list; gint patcount; GstStreamCollection *collection; /* Pending Tags for the program */ GstTagList *tags; guint event_id; /* TRUE if the program is currently being used */ gboolean active; /* TRUE if this is the first program created */ gboolean initial_program; }; typedef enum { /* PULL MODE */ BASE_MODE_SCANNING, /* Looking for PAT/PMT */ BASE_MODE_SEEKING, /* Seeking */ BASE_MODE_STREAMING, /* Normal mode (pushing out data) */ /* PUSH MODE */ BASE_MODE_PUSHING } MpegTSBaseMode; struct _MpegTSBase { GstElement element; GstPad *sinkpad; /* pull-based behaviour */ MpegTSBaseMode mode; /* Current pull offset (also set by seek handler) */ guint64 seek_offset; /* Cached packetsize */ guint16 packetsize; /* the following vars must be protected with the OBJECT_LOCK as they can be * accessed from the application thread and the streaming thread */ GHashTable *programs; GPtrArray *pat; MpegTSPacketizer2 *packetizer; /* arrays that say whether a pid is a known psi pid or a pes pid */ /* Use MPEGTS_BIT_* to set/unset/check the values */ guint8 *known_psi; guint8 *is_pes; gboolean disposed; /* size of the MpegTSBaseProgram structure, can be overridden * by subclasses if they have their own MpegTSBaseProgram subclasses. */ gsize program_size; /* size of the MpegTSBaseStream structure, can be overridden * by subclasses if they have their own MpegTSBaseStream subclasses */ gsize stream_size; /* Whether we saw a PAT yet */ gboolean seen_pat; /* Upstream segment */ GstSegment segment; /* Last received seek event seqnum (default GST_SEQNUM_INVALID) */ guint last_seek_seqnum; /* Whether to parse private section or not */ gboolean parse_private_sections; /* Whether to push data and/or sections to subclasses */ gboolean push_data; gboolean push_section; /* Whether the parent bin is streams-aware, meaning we can * add/remove streams at any point in time */ gboolean streams_aware; }; struct _MpegTSBaseClass { GstElementClass parent_class; /* Virtual methods */ void (*reset) (MpegTSBase *base); GstFlowReturn (*push) (MpegTSBase *base, MpegTSPacketizerPacket *packet, GstMpegtsSection * section); void (*inspect_packet) (MpegTSBase *base, MpegTSPacketizerPacket *packet); /* takes ownership of @event */ gboolean (*push_event) (MpegTSBase *base, GstEvent * event); /* program_started gets called when program's pmt arrives for first time */ void (*program_started) (MpegTSBase *base, MpegTSBaseProgram *program); /* program_stopped gets called when pat no longer has program's pmt */ void (*program_stopped) (MpegTSBase *base, MpegTSBaseProgram *program); void (*update_program) (MpegTSBase *base, MpegTSBaseProgram *program); /* Whether mpegtbase can deactivate/free a program or whether the subclass will do it * If the subclass responds TRUE, it should call mpegts_base_deactivate_and_free_program() * when it wants to remove it */ gboolean (*can_remove_program) (MpegTSBase *base, MpegTSBaseProgram *program); /* stream_added is called whenever a new stream has been identified */ gboolean (*stream_added) (MpegTSBase *base, MpegTSBaseStream *stream, MpegTSBaseProgram *program); /* stream_removed is called whenever a stream is no longer referenced */ void (*stream_removed) (MpegTSBase *base, MpegTSBaseStream *stream); /* find_timestamps is called to find PCR */ GstFlowReturn (*find_timestamps) (MpegTSBase * base, guint64 initoff, guint64 *offset); /* seek is called to wait for seeking */ GstFlowReturn (*seek) (MpegTSBase * base, GstEvent * event); /* Drain all currently pending data */ GstFlowReturn (*drain) (MpegTSBase * base); /* flush all streams * The hard inicator is used to flush completelly on FLUSH_STOP events * or partially in pull mode seeks of tsdemux */ void (*flush) (MpegTSBase * base, gboolean hard); /* Notifies subclasses input buffer has been handled */ GstFlowReturn (*input_done) (MpegTSBase *base, GstBuffer *buffer); /* signals */ void (*pat_info) (GstStructure *pat); void (*pmt_info) (GstStructure *pmt); void (*nit_info) (GstStructure *nit); void (*sdt_info) (GstStructure *sdt); void (*eit_info) (GstStructure *eit); }; #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))) G_GNUC_INTERNAL GType mpegts_base_get_type(void); G_GNUC_INTERNAL MpegTSBaseProgram *mpegts_base_get_program (MpegTSBase * base, gint program_number); G_GNUC_INTERNAL MpegTSBaseProgram *mpegts_base_add_program (MpegTSBase * base, gint program_number, guint16 pmt_pid); G_GNUC_INTERNAL const GstMpegtsDescriptor *mpegts_get_descriptor_from_stream (MpegTSBaseStream * stream, guint8 tag); G_GNUC_INTERNAL const GstMpegtsDescriptor *mpegts_get_descriptor_from_program (MpegTSBaseProgram * program, guint8 tag); G_GNUC_INTERNAL gboolean mpegts_base_handle_seek_event(MpegTSBase * base, GstPad * pad, GstEvent * event); G_GNUC_INTERNAL gboolean gst_mpegtsbase_plugin_init (GstPlugin * plugin); G_GNUC_INTERNAL void mpegts_base_deactivate_and_free_program (MpegTSBase *base, MpegTSBaseProgram *program); G_END_DECLS #endif /* GST_MPEG_TS_BASE_H */