/* * mpegtsbase.c - * Copyright (C) 2007 Alessandro Decina * 2010 Edward Hervey * Copyright (C) 2011, Hewlett-Packard Development Company, L.P. * Author: Youness Alaoui , Collabora Ltd. * Author: Sebastian Dröge , Collabora Ltd. * Author: Edward Hervey , Collabora Ltd. * * Authors: * Alessandro Decina * Zaheer Abbas Merali * 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. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include "mpegtsbase.h" #include "gstmpegdesc.h" #define RUNNING_STATUS_RUNNING 4 GST_DEBUG_CATEGORY_STATIC (mpegts_base_debug); #define GST_CAT_DEFAULT mpegts_base_debug static GQuark QUARK_PROGRAMS; static GQuark QUARK_PROGRAM_NUMBER; static GQuark QUARK_PID; static GQuark QUARK_PCR_PID; static GQuark QUARK_STREAMS; static GQuark QUARK_STREAM_TYPE; static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/mpegts, " "systemstream = (boolean) true ") ); enum { PROP_0, PROP_PARSE_PRIVATE_SECTIONS, /* FILL ME */ }; static void mpegts_base_dispose (GObject * object); static void mpegts_base_finalize (GObject * object); static void mpegts_base_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void mpegts_base_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void mpegts_base_free_program (MpegTSBaseProgram * program); static void mpegts_base_deactivate_program (MpegTSBase * base, MpegTSBaseProgram * program); static gboolean mpegts_base_sink_activate (GstPad * pad, GstObject * parent); static gboolean mpegts_base_sink_activate_mode (GstPad * pad, GstObject * parent, GstPadMode mode, gboolean active); static GstFlowReturn mpegts_base_chain (GstPad * pad, GstObject * parent, GstBuffer * buf); static gboolean mpegts_base_sink_event (GstPad * pad, GstObject * parent, GstEvent * event); static GstStateChangeReturn mpegts_base_change_state (GstElement * element, GstStateChange transition); static gboolean mpegts_base_get_tags_from_eit (MpegTSBase * base, GstMpegtsSection * section); static gboolean mpegts_base_parse_atsc_mgt (MpegTSBase * base, GstMpegtsSection * section); static gboolean remove_each_program (gpointer key, MpegTSBaseProgram * program, MpegTSBase * base); static void _extra_init (void) { QUARK_PROGRAMS = g_quark_from_string ("programs"); QUARK_PROGRAM_NUMBER = g_quark_from_string ("program-number"); QUARK_PID = g_quark_from_string ("pid"); QUARK_PCR_PID = g_quark_from_string ("pcr-pid"); QUARK_STREAMS = g_quark_from_string ("streams"); QUARK_STREAM_TYPE = g_quark_from_string ("stream-type"); } #define mpegts_base_parent_class parent_class G_DEFINE_TYPE_WITH_CODE (MpegTSBase, mpegts_base, GST_TYPE_ELEMENT, _extra_init ()); /* Default implementation is that mpegtsbase can remove any program */ static gboolean mpegts_base_can_remove_program (MpegTSBase * base, MpegTSBaseProgram * program) { return TRUE; } static void mpegts_base_class_init (MpegTSBaseClass * klass) { GObjectClass *gobject_class; GstElementClass *element_class; klass->can_remove_program = mpegts_base_can_remove_program; element_class = GST_ELEMENT_CLASS (klass); element_class->change_state = mpegts_base_change_state; gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&sink_template)); gobject_class = G_OBJECT_CLASS (klass); gobject_class->dispose = mpegts_base_dispose; gobject_class->finalize = mpegts_base_finalize; gobject_class->set_property = mpegts_base_set_property; gobject_class->get_property = mpegts_base_get_property; g_object_class_install_property (gobject_class, PROP_PARSE_PRIVATE_SECTIONS, g_param_spec_boolean ("parse-private-sections", "Parse private sections", "Parse private sections", FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } static void mpegts_base_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { MpegTSBase *base = GST_MPEGTS_BASE (object); switch (prop_id) { case PROP_PARSE_PRIVATE_SECTIONS: base->parse_private_sections = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } } static void mpegts_base_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { MpegTSBase *base = GST_MPEGTS_BASE (object); switch (prop_id) { case PROP_PARSE_PRIVATE_SECTIONS: g_value_set_boolean (value, base->parse_private_sections); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } } static void mpegts_base_reset (MpegTSBase * base) { MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base); mpegts_packetizer_clear (base->packetizer); memset (base->is_pes, 0, 1024); memset (base->known_psi, 0, 1024); /* FIXME : Actually these are not *always* know SI streams * depending on the variant of mpeg-ts being used. */ /* Known PIDs : PAT, TSDT, IPMP CIT */ MPEGTS_BIT_SET (base->known_psi, 0); MPEGTS_BIT_SET (base->known_psi, 2); MPEGTS_BIT_SET (base->known_psi, 3); /* TDT, TOT, ST */ MPEGTS_BIT_SET (base->known_psi, 0x14); /* network synchronization */ MPEGTS_BIT_SET (base->known_psi, 0x15); /* ATSC */ MPEGTS_BIT_SET (base->known_psi, 0x1ffb); if (base->pat) { g_ptr_array_unref (base->pat); base->pat = NULL; } gst_segment_init (&base->segment, GST_FORMAT_UNDEFINED); base->last_seek_seqnum = (guint32) - 1; base->mode = BASE_MODE_STREAMING; base->seen_pat = FALSE; base->seek_offset = -1; g_hash_table_foreach_remove (base->programs, (GHRFunc) remove_each_program, base); if (klass->reset) klass->reset (base); } static void mpegts_base_init (MpegTSBase * base) { base->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink"); gst_pad_set_activate_function (base->sinkpad, mpegts_base_sink_activate); gst_pad_set_activatemode_function (base->sinkpad, mpegts_base_sink_activate_mode); gst_pad_set_chain_function (base->sinkpad, mpegts_base_chain); gst_pad_set_event_function (base->sinkpad, mpegts_base_sink_event); gst_element_add_pad (GST_ELEMENT (base), base->sinkpad); base->disposed = FALSE; base->packetizer = mpegts_packetizer_new (); base->programs = g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL, (GDestroyNotify) mpegts_base_free_program); base->parse_private_sections = FALSE; base->is_pes = g_new0 (guint8, 1024); base->known_psi = g_new0 (guint8, 1024); base->program_size = sizeof (MpegTSBaseProgram); base->stream_size = sizeof (MpegTSBaseStream); base->push_data = TRUE; base->push_section = TRUE; mpegts_base_reset (base); } static void mpegts_base_dispose (GObject * object) { MpegTSBase *base = GST_MPEGTS_BASE (object); if (!base->disposed) { g_object_unref (base->packetizer); base->disposed = TRUE; g_free (base->known_psi); g_free (base->is_pes); } if (G_OBJECT_CLASS (parent_class)->dispose) G_OBJECT_CLASS (parent_class)->dispose (object); } static void mpegts_base_finalize (GObject * object) { MpegTSBase *base = GST_MPEGTS_BASE (object); if (base->pat) { g_ptr_array_unref (base->pat); base->pat = NULL; } g_hash_table_destroy (base->programs); if (G_OBJECT_CLASS (parent_class)->finalize) G_OBJECT_CLASS (parent_class)->finalize (object); } /* returns NULL if no matching descriptor found * * otherwise returns a descriptor that needs to * * be freed */ const GstMpegtsDescriptor * mpegts_get_descriptor_from_stream (MpegTSBaseStream * stream, guint8 tag) { GstMpegtsPMTStream *pmt = stream->stream; GST_DEBUG ("Searching for tag 0x%02x in stream 0x%04x (stream_type 0x%02x)", tag, stream->pid, stream->stream_type); return gst_mpegts_find_descriptor (pmt->descriptors, tag); } typedef struct { gboolean res; guint16 pid; } PIDLookup; static void foreach_pid_in_program (gpointer key, MpegTSBaseProgram * program, PIDLookup * lookup) { if (!program->active) return; if (program->streams[lookup->pid]) lookup->res = TRUE; } static gboolean mpegts_pid_in_active_programs (MpegTSBase * base, guint16 pid) { PIDLookup lookup; lookup.res = FALSE; lookup.pid = pid; g_hash_table_foreach (base->programs, (GHFunc) foreach_pid_in_program, &lookup); return lookup.res; } /* returns NULL if no matching descriptor found * * otherwise returns a descriptor that needs to * * be freed */ const GstMpegtsDescriptor * mpegts_get_descriptor_from_program (MpegTSBaseProgram * program, guint8 tag) { const GstMpegtsPMT *pmt = program->pmt; return gst_mpegts_find_descriptor (pmt->descriptors, tag); } static MpegTSBaseProgram * mpegts_base_new_program (MpegTSBase * base, gint program_number, guint16 pmt_pid) { MpegTSBaseProgram *program; GST_DEBUG_OBJECT (base, "program_number : %d, pmt_pid : %d", program_number, pmt_pid); program = g_malloc0 (base->program_size); program->program_number = program_number; program->pmt_pid = pmt_pid; program->pcr_pid = G_MAXUINT16; program->streams = g_new0 (MpegTSBaseStream *, 0x2000); program->patcount = 0; return program; } MpegTSBaseProgram * mpegts_base_add_program (MpegTSBase * base, gint program_number, guint16 pmt_pid) { MpegTSBaseProgram *program; GST_DEBUG_OBJECT (base, "program_number : %d, pmt_pid : %d", program_number, pmt_pid); program = mpegts_base_new_program (base, program_number, pmt_pid); /* Mark the PMT PID as being a known PSI PID */ if (G_UNLIKELY (MPEGTS_BIT_IS_SET (base->known_psi, pmt_pid))) { GST_FIXME ("Refcounting. Setting twice a PID (0x%04x) as known PSI", pmt_pid); } MPEGTS_BIT_SET (base->known_psi, pmt_pid); g_hash_table_insert (base->programs, GINT_TO_POINTER (program_number), program); return program; } MpegTSBaseProgram * mpegts_base_get_program (MpegTSBase * base, gint program_number) { MpegTSBaseProgram *program; program = (MpegTSBaseProgram *) g_hash_table_lookup (base->programs, GINT_TO_POINTER ((gint) program_number)); return program; } static MpegTSBaseProgram * mpegts_base_steal_program (MpegTSBase * base, gint program_number) { MpegTSBaseProgram *program; program = (MpegTSBaseProgram *) g_hash_table_lookup (base->programs, GINT_TO_POINTER ((gint) program_number)); if (program) g_hash_table_steal (base->programs, GINT_TO_POINTER ((gint) program_number)); return program; } static void mpegts_base_free_program (MpegTSBaseProgram * program) { GList *tmp; if (program->pmt) { gst_mpegts_section_unref (program->section); program->pmt = NULL; } for (tmp = program->stream_list; tmp; tmp = tmp->next) g_free (tmp->data); if (program->stream_list) g_list_free (program->stream_list); g_free (program->streams); if (program->tags) gst_tag_list_unref (program->tags); g_free (program); } void mpegts_base_deactivate_and_free_program (MpegTSBase * base, MpegTSBaseProgram * program) { GST_DEBUG_OBJECT (base, "program_number : %d", program->program_number); mpegts_base_deactivate_program (base, program); mpegts_base_free_program (program); } static void mpegts_base_remove_program (MpegTSBase * base, gint program_number) { GST_DEBUG_OBJECT (base, "program_number : %d", program_number); g_hash_table_remove (base->programs, GINT_TO_POINTER (program_number)); } static guint32 get_registration_from_descriptors (GPtrArray * descriptors) { const GstMpegtsDescriptor *desc; if ((desc = gst_mpegts_find_descriptor (descriptors, GST_MTS_DESC_REGISTRATION))) { if (G_UNLIKELY (desc->length < 4)) { GST_WARNING ("Registration descriptor with length < 4. (Corrupted ?)"); } else return GST_READ_UINT32_BE (desc->data + 2); } return 0; } static MpegTSBaseStream * mpegts_base_program_add_stream (MpegTSBase * base, MpegTSBaseProgram * program, guint16 pid, guint8 stream_type, GstMpegtsPMTStream * stream) { MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base); MpegTSBaseStream *bstream; GST_DEBUG ("pid:0x%04x, stream_type:0x%03x", pid, stream_type); if (G_UNLIKELY (program->streams[pid])) { if (stream_type != 0xff) GST_WARNING ("Stream already present !"); return NULL; } bstream = g_malloc0 (base->stream_size); bstream->pid = pid; bstream->stream_type = stream_type; bstream->stream = stream; if (stream) { bstream->registration_id = get_registration_from_descriptors (stream->descriptors); GST_DEBUG ("PID 0x%04x, registration_id %" SAFE_FOURCC_FORMAT, bstream->pid, SAFE_FOURCC_ARGS (bstream->registration_id)); } program->streams[pid] = bstream; program->stream_list = g_list_append (program->stream_list, bstream); if (klass->stream_added) klass->stream_added (base, bstream, program); return bstream; } static void mpegts_base_program_remove_stream (MpegTSBase * base, MpegTSBaseProgram * program, guint16 pid) { MpegTSBaseClass *klass; MpegTSBaseStream *stream = program->streams[pid]; GST_DEBUG ("pid:0x%04x", pid); if (G_UNLIKELY (stream == NULL)) { /* Can happen if the PCR PID is the same as a audio/video PID */ GST_DEBUG ("Stream already removed"); return; } klass = GST_MPEGTS_BASE_GET_CLASS (base); /* If subclass needs it, inform it of the stream we are about to remove */ if (klass->stream_removed) klass->stream_removed (base, stream); program->stream_list = g_list_remove_all (program->stream_list, stream); g_free (stream); program->streams[pid] = NULL; } /* Return TRUE if programs are equal */ static gboolean mpegts_base_is_same_program (MpegTSBase * base, MpegTSBaseProgram * oldprogram, guint16 new_pmt_pid, const GstMpegtsPMT * new_pmt) { guint i, nbstreams; MpegTSBaseStream *oldstream; gboolean sawpcrpid = FALSE; if (oldprogram->pmt_pid != new_pmt_pid) { GST_DEBUG ("Different pmt_pid (new:0x%04x, old:0x%04x)", new_pmt_pid, oldprogram->pmt_pid); return FALSE; } if (oldprogram->pcr_pid != new_pmt->pcr_pid) { GST_DEBUG ("Different pcr_pid (new:0x%04x, old:0x%04x)", new_pmt->pcr_pid, oldprogram->pcr_pid); return FALSE; } /* Check the streams */ nbstreams = new_pmt->streams->len; for (i = 0; i < nbstreams; ++i) { GstMpegtsPMTStream *stream = g_ptr_array_index (new_pmt->streams, i); oldstream = oldprogram->streams[stream->pid]; if (!oldstream) { GST_DEBUG ("New stream 0x%04x not present in old program", stream->pid); return FALSE; } if (oldstream->stream_type != stream->stream_type) { GST_DEBUG ("New stream 0x%04x has a different stream type (new:%d, old:%d)", stream->pid, stream->stream_type, oldstream->stream_type); return FALSE; } if (stream->pid == oldprogram->pcr_pid) sawpcrpid = TRUE; } /* If the pcr is not shared with an existing stream, we'll have one extra stream */ if (!sawpcrpid) nbstreams += 1; if (nbstreams != g_list_length (oldprogram->stream_list)) { GST_DEBUG ("Different number of streams (new:%d, old:%d)", nbstreams, g_list_length (oldprogram->stream_list)); return FALSE; } GST_DEBUG ("Programs are equal"); return TRUE; } static void mpegts_base_deactivate_program (MpegTSBase * base, MpegTSBaseProgram * program) { gint i; MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base); if (G_UNLIKELY (program->active == FALSE)) return; GST_DEBUG_OBJECT (base, "Deactivating PMT"); program->active = FALSE; if (program->pmt) { for (i = 0; i < program->pmt->streams->len; ++i) { GstMpegtsPMTStream *stream = g_ptr_array_index (program->pmt->streams, i); mpegts_base_program_remove_stream (base, program, stream->pid); /* Only unset the is_pes/known_psi bit if the PID isn't used in any other active * program */ if (!mpegts_pid_in_active_programs (base, stream->pid)) { switch (stream->stream_type) { case GST_MPEGTS_STREAM_TYPE_SCTE_DSMCC_DCB: case GST_MPEGTS_STREAM_TYPE_SCTE_SIGNALING: { guint32 registration_id = get_registration_from_descriptors (stream->descriptors); /* Not a private section stream */ if (registration_id != DRF_ID_CUEI && registration_id != DRF_ID_ETV1) break; /* Fall through on purpose - remove this PID from known_psi */ } case GST_MPEGTS_STREAM_TYPE_PRIVATE_SECTIONS: case GST_MPEGTS_STREAM_TYPE_MHEG: case GST_MPEGTS_STREAM_TYPE_DSM_CC: case GST_MPEGTS_STREAM_TYPE_DSMCC_A: case GST_MPEGTS_STREAM_TYPE_DSMCC_B: case GST_MPEGTS_STREAM_TYPE_DSMCC_C: case GST_MPEGTS_STREAM_TYPE_DSMCC_D: case GST_MPEGTS_STREAM_TYPE_SL_FLEXMUX_SECTIONS: case GST_MPEGTS_STREAM_TYPE_METADATA_SECTIONS: /* Set known PSI streams */ if (base->parse_private_sections) MPEGTS_BIT_UNSET (base->known_psi, stream->pid); break; default: MPEGTS_BIT_UNSET (base->is_pes, stream->pid); break; } } } /* remove pcr stream */ /* FIXME : This might actually be shared with another stream ? */ mpegts_base_program_remove_stream (base, program, program->pcr_pid); if (!mpegts_pid_in_active_programs (base, program->pcr_pid)) MPEGTS_BIT_UNSET (base->is_pes, program->pcr_pid); GST_DEBUG ("program stream_list is now %p", program->stream_list); } /* Inform subclasses we're deactivating this program */ if (klass->program_stopped) klass->program_stopped (base, program); } static void mpegts_base_activate_program (MpegTSBase * base, MpegTSBaseProgram * program, guint16 pmt_pid, GstMpegtsSection * section, const GstMpegtsPMT * pmt, gboolean initial_program) { guint i; MpegTSBaseClass *klass; if (G_UNLIKELY (program->active)) return; GST_DEBUG ("Activating program %d", program->program_number); /* activate new pmt */ if (program->section) gst_mpegts_section_unref (program->section); program->section = gst_mpegts_section_ref (section); program->pmt = pmt; program->pmt_pid = pmt_pid; program->pcr_pid = pmt->pcr_pid; /* extract top-level registration_id if present */ program->registration_id = get_registration_from_descriptors (pmt->descriptors); GST_DEBUG ("program 0x%04x, registration_id %" SAFE_FOURCC_FORMAT, program->program_number, SAFE_FOURCC_ARGS (program->registration_id)); for (i = 0; i < pmt->streams->len; ++i) { GstMpegtsPMTStream *stream = g_ptr_array_index (pmt->streams, i); switch (stream->stream_type) { case GST_MPEGTS_STREAM_TYPE_SCTE_DSMCC_DCB: case GST_MPEGTS_STREAM_TYPE_SCTE_SIGNALING: { guint32 registration_id = get_registration_from_descriptors (stream->descriptors); /* Not a private section stream */ if (registration_id != DRF_ID_CUEI && registration_id != DRF_ID_ETV1) break; /* Fall through on purpose - remove this PID from known_psi */ } case GST_MPEGTS_STREAM_TYPE_PRIVATE_SECTIONS: case GST_MPEGTS_STREAM_TYPE_MHEG: case GST_MPEGTS_STREAM_TYPE_DSM_CC: case GST_MPEGTS_STREAM_TYPE_DSMCC_A: case GST_MPEGTS_STREAM_TYPE_DSMCC_B: case GST_MPEGTS_STREAM_TYPE_DSMCC_C: case GST_MPEGTS_STREAM_TYPE_DSMCC_D: case GST_MPEGTS_STREAM_TYPE_SL_FLEXMUX_SECTIONS: case GST_MPEGTS_STREAM_TYPE_METADATA_SECTIONS: /* Set known PSI streams */ if (base->parse_private_sections) MPEGTS_BIT_SET (base->known_psi, stream->pid); break; default: if (G_UNLIKELY (MPEGTS_BIT_IS_SET (base->is_pes, stream->pid))) GST_FIXME ("Refcounting issue. Setting twice a PID (0x%04x) as known PES", stream->pid); if (G_UNLIKELY (MPEGTS_BIT_IS_SET (base->known_psi, stream->pid))) { GST_FIXME ("Refcounting issue. Setting a known PSI PID (0x%04x) as known PES", stream->pid); MPEGTS_BIT_UNSET (base->known_psi, stream->pid); } MPEGTS_BIT_SET (base->is_pes, stream->pid); break; } mpegts_base_program_add_stream (base, program, stream->pid, stream->stream_type, stream); } /* We add the PCR pid last. If that PID is already used by one of the media * streams above, no new stream will be created */ mpegts_base_program_add_stream (base, program, pmt->pcr_pid, -1, NULL); MPEGTS_BIT_SET (base->is_pes, pmt->pcr_pid); program->active = TRUE; program->initial_program = initial_program; klass = GST_MPEGTS_BASE_GET_CLASS (base); if (klass->program_started != NULL) klass->program_started (base, program); GST_DEBUG_OBJECT (base, "new pmt activated"); } static gboolean mpegts_base_apply_pat (MpegTSBase * base, GstMpegtsSection * section) { GPtrArray *pat = gst_mpegts_section_get_pat (section); GPtrArray *old_pat; MpegTSBaseProgram *program; gint i; if (G_UNLIKELY (pat == NULL)) return FALSE; GST_INFO_OBJECT (base, "PAT"); /* Applying a new PAT does two things: * * It adds the new programs to the list of programs this element handles * and increments at the same time the number of times a program is referenced. * * * If there was a previously active PAT, It decrements the reference count * of all program it used. If a program is no longer needed, it is removed. */ old_pat = base->pat; base->pat = pat; GST_LOG ("Activating new Program Association Table"); /* activate the new table */ for (i = 0; i < pat->len; ++i) { GstMpegtsPatProgram *patp = g_ptr_array_index (pat, i); program = mpegts_base_get_program (base, patp->program_number); if (program) { /* IF the program already existed, just check if the PMT PID changed */ if (program->pmt_pid != patp->network_or_program_map_PID) { if (program->pmt_pid != G_MAXUINT16) { /* pmt pid changed */ /* FIXME: when this happens it may still be pmt pid of another * program, so setting to False may make it go through expensive * path in is_psi unnecessarily */ MPEGTS_BIT_UNSET (base->known_psi, program->pmt_pid); } program->pmt_pid = patp->network_or_program_map_PID; if (G_UNLIKELY (MPEGTS_BIT_IS_SET (base->known_psi, program->pmt_pid))) GST_FIXME ("Refcounting issue. Setting twice a PMT PID (0x%04x) as know PSI", program->pmt_pid); MPEGTS_BIT_SET (base->known_psi, patp->network_or_program_map_PID); } } else { /* Create a new program */ program = mpegts_base_add_program (base, patp->program_number, patp->network_or_program_map_PID); } /* We mark this program as being referenced by one PAT */ program->patcount += 1; } if (old_pat) { MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base); /* deactivate the old table */ GST_LOG ("Deactivating old Program Association Table"); for (i = 0; i < old_pat->len; ++i) { GstMpegtsPatProgram *patp = g_ptr_array_index (old_pat, i); program = mpegts_base_get_program (base, patp->program_number); if (G_UNLIKELY (program == NULL)) { GST_DEBUG_OBJECT (base, "broken PAT, duplicated entry for program %d", patp->program_number); continue; } if (--program->patcount > 0) /* the program has been referenced by the new pat, keep it */ continue; GST_INFO_OBJECT (base, "PAT removing program 0x%04x 0x%04x", patp->program_number, patp->network_or_program_map_PID); if (klass->can_remove_program (base, program)) { mpegts_base_deactivate_program (base, program); mpegts_base_remove_program (base, patp->program_number); } /* FIXME: when this happens it may still be pmt pid of another * program, so setting to False may make it go through expensive * path in is_psi unnecessarily */ if (G_UNLIKELY (MPEGTS_BIT_IS_SET (base->known_psi, patp->network_or_program_map_PID))) { GST_FIXME ("Program refcounting : Setting twice a pid (0x%04x) as known PSI", patp->network_or_program_map_PID); } MPEGTS_BIT_SET (base->known_psi, patp->network_or_program_map_PID); mpegts_packetizer_remove_stream (base->packetizer, patp->network_or_program_map_PID); } g_ptr_array_unref (old_pat); } return TRUE; } static gboolean mpegts_base_apply_pmt (MpegTSBase * base, GstMpegtsSection * section) { const GstMpegtsPMT *pmt; MpegTSBaseProgram *program, *old_program; guint program_number; gboolean initial_program = TRUE; pmt = gst_mpegts_section_get_pmt (section); if (G_UNLIKELY (pmt == NULL)) { GST_ERROR ("Could not get PMT (corrupted ?)"); return FALSE; } /* FIXME : not so sure this is valid anymore */ if (G_UNLIKELY (base->seen_pat == FALSE)) { GST_WARNING ("Got pmt without pat first. Returning"); /* remove the stream since we won't get another PMT otherwise */ mpegts_packetizer_remove_stream (base->packetizer, section->pid); return TRUE; } program_number = section->subtable_extension; GST_DEBUG ("Applying PMT (program_number:%d, pid:0x%04x)", program_number, section->pid); /* In order for stream switching to happen properly in decodebin(2), * we need to first add the new pads (i.e. activate the new program) * before removing the old ones (i.e. deactivating the old program) */ old_program = mpegts_base_get_program (base, program_number); if (G_UNLIKELY (old_program == NULL)) goto no_program; if (G_UNLIKELY (mpegts_base_is_same_program (base, old_program, section->pid, pmt))) goto same_program; /* If the current program is active, this means we have a new program */ if (old_program->active) { MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base); old_program = mpegts_base_steal_program (base, program_number); program = mpegts_base_new_program (base, program_number, section->pid); program->patcount = old_program->patcount; g_hash_table_insert (base->programs, GINT_TO_POINTER (program_number), program); /* Desactivate the old program */ /* FIXME : THIS IS BREAKING THE STREAM SWITCHING LOGIC ! * */ if (klass->can_remove_program (base, old_program)) { mpegts_base_deactivate_program (base, old_program); mpegts_base_free_program (old_program); } initial_program = FALSE; } else program = old_program; /* activate program */ /* Ownership of pmt_info is given to the program */ mpegts_base_activate_program (base, program, section->pid, section, pmt, initial_program); return TRUE; no_program: { GST_ERROR ("Attempted to apply a PMT on a program that wasn't created"); return TRUE; } same_program: { GST_DEBUG ("Not applying identical program"); return TRUE; } } static void mpegts_base_handle_psi (MpegTSBase * base, GstMpegtsSection * section) { gboolean post_message = TRUE; GST_DEBUG ("Handling PSI (pid: 0x%04x , table_id: 0x%02x)", section->pid, section->table_id); switch (section->section_type) { case GST_MPEGTS_SECTION_PAT: post_message = mpegts_base_apply_pat (base, section); if (base->seen_pat == FALSE) { base->seen_pat = TRUE; GST_DEBUG ("First PAT offset: %" G_GUINT64_FORMAT, section->offset); mpegts_packetizer_set_reference_offset (base->packetizer, section->offset); } break; case GST_MPEGTS_SECTION_PMT: post_message = mpegts_base_apply_pmt (base, section); break; case GST_MPEGTS_SECTION_EIT: /* some tag xtraction + posting */ post_message = mpegts_base_get_tags_from_eit (base, section); break; case GST_MPEGTS_SECTION_ATSC_MGT: post_message = mpegts_base_parse_atsc_mgt (base, section); break; default: break; } /* Finally post message (if it wasn't corrupted) */ if (post_message) gst_element_post_message (GST_ELEMENT_CAST (base), gst_message_new_mpegts_section (GST_OBJECT (base), section)); gst_mpegts_section_unref (section); } static gboolean mpegts_base_parse_atsc_mgt (MpegTSBase * base, GstMpegtsSection * section) { const GstMpegtsAtscMGT *mgt; gint i; mgt = gst_mpegts_section_get_atsc_mgt (section); if (G_UNLIKELY (mgt == NULL)) return FALSE; for (i = 0; i < mgt->tables->len; ++i) { GstMpegtsAtscMGTTable *table = g_ptr_array_index (mgt->tables, i); if ((table->table_type >= GST_MPEGTS_ATSC_MGT_TABLE_TYPE_EIT0 && table->table_type <= GST_MPEGTS_ATSC_MGT_TABLE_TYPE_EIT127) || (table->table_type >= GST_MPEGTS_ATSC_MGT_TABLE_TYPE_ETT0 && table->table_type <= GST_MPEGTS_ATSC_MGT_TABLE_TYPE_ETT127)) { MPEGTS_BIT_SET (base->known_psi, table->pid); } } return TRUE; } static gboolean mpegts_base_get_tags_from_eit (MpegTSBase * base, GstMpegtsSection * section) { const GstMpegtsEIT *eit; guint i; MpegTSBaseProgram *program; /* Early exit if it's not from the present/following table_id */ if (section->table_id != GST_MTS_TABLE_ID_EVENT_INFORMATION_ACTUAL_TS_PRESENT && section->table_id != GST_MTS_TABLE_ID_EVENT_INFORMATION_OTHER_TS_PRESENT) return TRUE; eit = gst_mpegts_section_get_eit (section); if (G_UNLIKELY (eit == NULL)) return FALSE; program = mpegts_base_get_program (base, section->subtable_extension); GST_DEBUG ("program_id:0x%04x, table_id:0x%02x, actual_stream:%d, present_following:%d, program:%p", section->subtable_extension, section->table_id, eit->actual_stream, eit->present_following, program); if (program && eit->present_following) { for (i = 0; i < eit->events->len; i++) { GstMpegtsEITEvent *event = g_ptr_array_index (eit->events, i); const GstMpegtsDescriptor *desc; if (event->running_status == RUNNING_STATUS_RUNNING) { program->event_id = event->event_id; if ((desc = gst_mpegts_find_descriptor (event->descriptors, GST_MTS_DESC_DVB_SHORT_EVENT))) { gchar *name; if (gst_mpegts_descriptor_parse_dvb_short_event (desc, NULL, &name, NULL)) { /* FIXME : Is it correct to post an event duration as a GST_TAG_DURATION ??? */ program->tags = gst_tag_list_new (GST_TAG_TITLE, name, GST_TAG_DURATION, event->duration * GST_SECOND, NULL); return TRUE; } } } } } return TRUE; } static gboolean remove_each_program (gpointer key, MpegTSBaseProgram * program, MpegTSBase * base) { /* First deactivate it */ mpegts_base_deactivate_program (base, program); return TRUE; } static inline GstFlowReturn mpegts_base_drain (MpegTSBase * base) { MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base); /* Call implementation */ if (klass->drain) return klass->drain (base); return GST_FLOW_OK; } static inline void mpegts_base_flush (MpegTSBase * base, gboolean hard) { MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base); /* Call implementation */ if (klass->flush) klass->flush (base, hard); } static gboolean mpegts_base_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) { gboolean res = TRUE; gboolean hard; MpegTSBase *base = GST_MPEGTS_BASE (parent); gboolean is_sticky = GST_EVENT_IS_STICKY (event); GST_DEBUG_OBJECT (base, "Got event %s", gst_event_type_get_name (GST_EVENT_TYPE (event))); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_SEGMENT: gst_event_copy_segment (event, &base->segment); GST_DEBUG_OBJECT (base, "Received segment %" GST_SEGMENT_FORMAT, &base->segment); /* Check if we need to switch PCR/PTS handling */ if (base->segment.format == GST_FORMAT_TIME) { base->packetizer->calculate_offset = FALSE; base->packetizer->calculate_skew = TRUE; } else { base->packetizer->calculate_offset = TRUE; base->packetizer->calculate_skew = FALSE; } res = GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, event); break; case GST_EVENT_STREAM_START: gst_event_unref (event); break; case GST_EVENT_CAPS: /* FIXME, do something */ gst_event_unref (event); break; case GST_EVENT_FLUSH_STOP: res = GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, event); hard = (base->mode != BASE_MODE_SEEKING); mpegts_packetizer_flush (base->packetizer, hard); mpegts_base_flush (base, hard); gst_segment_init (&base->segment, GST_FORMAT_UNDEFINED); base->seen_pat = FALSE; break; default: res = GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, event); } /* Always return TRUE for sticky events */ if (is_sticky) res = TRUE; return res; } static GstFlowReturn mpegts_base_chain (GstPad * pad, GstObject * parent, GstBuffer * buf) { GstFlowReturn res = GST_FLOW_OK; MpegTSBase *base; MpegTSPacketizerPacketReturn pret; MpegTSPacketizer2 *packetizer; MpegTSPacketizerPacket packet; MpegTSBaseClass *klass; base = GST_MPEGTS_BASE (parent); klass = GST_MPEGTS_BASE_GET_CLASS (base); packetizer = base->packetizer; if (klass->input_done) gst_buffer_ref (buf); if (GST_BUFFER_IS_DISCONT (buf)) { GST_DEBUG_OBJECT (base, "Got DISCONT buffer, flushing"); res = mpegts_base_drain (base); if (G_UNLIKELY (res != GST_FLOW_OK)) return res; mpegts_base_flush (base, FALSE); /* In the case of discontinuities in push-mode with TIME segment * we want to drop all previous observations (hard:TRUE) from * the packetizer */ if (base->mode == BASE_MODE_PUSHING && base->segment.format == GST_FORMAT_TIME) mpegts_packetizer_flush (base->packetizer, TRUE); else mpegts_packetizer_flush (base->packetizer, FALSE); } mpegts_packetizer_push (base->packetizer, buf); while (res == GST_FLOW_OK) { pret = mpegts_packetizer_next_packet (base->packetizer, &packet); /* If we don't have enough data, return */ if (G_UNLIKELY (pret == PACKET_NEED_MORE)) break; if (G_UNLIKELY (pret == PACKET_BAD)) { /* bad header, skip the packet */ GST_DEBUG_OBJECT (base, "bad packet, skipping"); goto next; } if (klass->inspect_packet) klass->inspect_packet (base, &packet); /* If it's a known PES, push it */ if (MPEGTS_BIT_IS_SET (base->is_pes, packet.pid)) { /* push the packet downstream */ if (base->push_data) res = klass->push (base, &packet, NULL); } else if (packet.payload && MPEGTS_BIT_IS_SET (base->known_psi, packet.pid)) { /* base PSI data */ GList *others, *tmp; GstMpegtsSection *section; section = mpegts_packetizer_push_section (packetizer, &packet, &others); if (section) mpegts_base_handle_psi (base, section); if (G_UNLIKELY (others)) { for (tmp = others; tmp; tmp = tmp->next) mpegts_base_handle_psi (base, (GstMpegtsSection *) tmp->data); g_list_free (others); } /* we need to push section packet downstream */ if (base->push_section) res = klass->push (base, &packet, section); } else if (packet.payload && packet.pid != 0x1fff) GST_LOG ("PID 0x%04x Saw packet on a pid we don't handle", packet.pid); next: mpegts_packetizer_clear_packet (base->packetizer, &packet); } if (klass->input_done) { if (res == GST_FLOW_OK) res = klass->input_done (base, buf); else gst_buffer_unref (buf); } return res; } static GstFlowReturn mpegts_base_scan (MpegTSBase * base) { GstFlowReturn ret = GST_FLOW_OK; GstBuffer *buf = NULL; guint i; gboolean done = FALSE; MpegTSPacketizerPacketReturn pret; gint64 tmpval; gint64 upstream_size, seek_pos, reverse_limit; GstFormat format; guint initial_pcr_seen; GST_DEBUG ("Scanning for initial sync point"); /* Find initial sync point and at least 5 PCR values */ for (i = 0; i < 20 && !done; i++) { GST_DEBUG ("Grabbing %d => %d", i * 65536, (i + 1) * 65536); ret = gst_pad_pull_range (base->sinkpad, i * 65536, 65536, &buf); if (G_UNLIKELY (ret == GST_FLOW_EOS)) break; if (G_UNLIKELY (ret != GST_FLOW_OK)) goto beach; /* Push to packetizer */ mpegts_packetizer_push (base->packetizer, buf); buf = NULL; if (mpegts_packetizer_has_packets (base->packetizer)) { if (base->seek_offset == -1) { /* Mark the initial sync point and remember the packetsize */ base->seek_offset = base->packetizer->offset; GST_DEBUG ("Sync point is now %" G_GUINT64_FORMAT, base->seek_offset); base->packetsize = base->packetizer->packet_size; } while (1) { /* Eat up all packets */ pret = mpegts_packetizer_process_next_packet (base->packetizer); if (pret == PACKET_NEED_MORE) break; if (pret != PACKET_BAD && base->packetizer->nb_seen_offsets >= 5) { GST_DEBUG ("Got enough initial PCR"); done = TRUE; break; } } } } initial_pcr_seen = base->packetizer->nb_seen_offsets; if (G_UNLIKELY (initial_pcr_seen == 0)) goto no_initial_pcr; GST_DEBUG ("Seen %d initial PCR", initial_pcr_seen); /* Now send data from the end */ /* Get the size of upstream */ format = GST_FORMAT_BYTES; if (!gst_pad_peer_query_duration (base->sinkpad, format, &tmpval)) goto beach; upstream_size = tmpval; /* The scanning takes place on the last 2048kB. Considering PCR should * be present at least every 100ms, this should cope with streams * up to 160Mbit/s */ reverse_limit = MAX (0, upstream_size - 2097152); /* Find last PCR value, searching backwards by chunks of 300 MPEG-ts packets */ for (seek_pos = MAX (0, upstream_size - 56400); seek_pos >= reverse_limit; seek_pos -= 56400) { mpegts_packetizer_clear (base->packetizer); GST_DEBUG ("Grabbing %" G_GUINT64_FORMAT " => %" G_GUINT64_FORMAT, seek_pos, seek_pos + 56400); ret = gst_pad_pull_range (base->sinkpad, seek_pos, 56400, &buf); if (G_UNLIKELY (ret == GST_FLOW_EOS)) break; if (G_UNLIKELY (ret != GST_FLOW_OK)) goto beach; /* Push to packetizer */ mpegts_packetizer_push (base->packetizer, buf); buf = NULL; if (mpegts_packetizer_has_packets (base->packetizer)) { pret = PACKET_OK; /* Eat up all packets, really try to get last PCR(s) */ while (pret != PACKET_NEED_MORE) pret = mpegts_packetizer_process_next_packet (base->packetizer); if (base->packetizer->nb_seen_offsets > initial_pcr_seen) { GST_DEBUG ("Got last PCR(s) (total seen:%d)", base->packetizer->nb_seen_offsets); break; } } } beach: mpegts_packetizer_clear (base->packetizer); return ret; no_initial_pcr: mpegts_packetizer_clear (base->packetizer); GST_WARNING_OBJECT (base, "Couldn't find any PCR within the first %d bytes", 10 * 65536); return GST_FLOW_ERROR; } static void mpegts_base_loop (MpegTSBase * base) { GstFlowReturn ret = GST_FLOW_ERROR; switch (base->mode) { case BASE_MODE_SCANNING: /* Find first sync point */ ret = mpegts_base_scan (base); if (G_UNLIKELY (ret != GST_FLOW_OK)) goto error; base->mode = BASE_MODE_STREAMING; GST_DEBUG ("Changing to Streaming"); break; case BASE_MODE_SEEKING: /* FIXME : unclear if we still need mode_seeking... */ base->mode = BASE_MODE_STREAMING; break; case BASE_MODE_STREAMING: { GstBuffer *buf = NULL; GST_DEBUG ("Pulling data from %" G_GUINT64_FORMAT, base->seek_offset); ret = gst_pad_pull_range (base->sinkpad, base->seek_offset, 100 * base->packetsize, &buf); if (G_UNLIKELY (ret != GST_FLOW_OK)) goto error; base->seek_offset += gst_buffer_get_size (buf); ret = mpegts_base_chain (base->sinkpad, GST_OBJECT_CAST (base), buf); if (G_UNLIKELY (ret != GST_FLOW_OK)) goto error; } break; case BASE_MODE_PUSHING: GST_WARNING ("wrong BASE_MODE_PUSHING mode in pull loop"); break; } return; error: { const gchar *reason = gst_flow_get_name (ret); GST_DEBUG_OBJECT (base, "Pausing task, reason %s", reason); if (ret == GST_FLOW_EOS) { if (!GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, gst_event_new_eos ())) GST_ELEMENT_ERROR (base, STREAM, FAILED, (_("Internal data stream error.")), ("No program activated before EOS")); } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) { GST_ELEMENT_ERROR (base, STREAM, FAILED, (_("Internal data stream error.")), ("stream stopped, reason %s", reason)); GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, gst_event_new_eos ()); } gst_pad_pause_task (base->sinkpad); } } gboolean mpegts_base_handle_seek_event (MpegTSBase * base, GstPad * pad, GstEvent * event) { MpegTSBaseClass *klass = GST_MPEGTS_BASE_GET_CLASS (base); GstFlowReturn ret = GST_FLOW_ERROR; gdouble rate; gboolean flush; GstFormat format; GstSeekFlags flags; GstSeekType start_type, stop_type; gint64 start, stop; GstEvent *flush_event = NULL; gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start, &stop_type, &stop); if (format != GST_FORMAT_TIME) return FALSE; if (GST_EVENT_SEQNUM (event) == base->last_seek_seqnum) { GST_DEBUG_OBJECT (base, "Skipping already handled seek"); return TRUE; } if (base->mode == BASE_MODE_PUSHING) { /* First try if upstream supports seeking in TIME format */ if (gst_pad_push_event (base->sinkpad, gst_event_ref (event))) { GST_DEBUG ("upstream handled SEEK event"); return TRUE; } /* If the subclass can seek, do that */ if (klass->seek) { ret = klass->seek (base, event); if (G_UNLIKELY (ret != GST_FLOW_OK)) GST_WARNING ("seeking failed %s", gst_flow_get_name (ret)); else { GstEvent *new_seek; if (GST_CLOCK_TIME_IS_VALID (base->seek_offset)) { base->mode = BASE_MODE_SEEKING; new_seek = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags, GST_SEEK_TYPE_SET, base->seek_offset, GST_SEEK_TYPE_NONE, -1); gst_event_set_seqnum (new_seek, GST_EVENT_SEQNUM (event)); if (!gst_pad_push_event (base->sinkpad, new_seek)) ret = GST_FLOW_ERROR; else base->last_seek_seqnum = GST_EVENT_SEQNUM (event); } base->mode = BASE_MODE_PUSHING; } } else { GST_WARNING ("subclass has no seek implementation"); } return ret == GST_FLOW_OK; } if (!klass->seek) { GST_WARNING ("subclass has no seek implementation"); return FALSE; } if (rate <= 0.0) { GST_WARNING ("Negative rate not supported"); return FALSE; } GST_DEBUG ("seek event, rate: %f start: %" GST_TIME_FORMAT " stop: %" GST_TIME_FORMAT, rate, GST_TIME_ARGS (start), GST_TIME_ARGS (stop)); flush = flags & GST_SEEK_FLAG_FLUSH; /* stop streaming, either by flushing or by pausing the task */ base->mode = BASE_MODE_SEEKING; if (flush) { GST_DEBUG_OBJECT (base, "sending flush start"); flush_event = gst_event_new_flush_start (); gst_event_set_seqnum (flush_event, GST_EVENT_SEQNUM (event)); gst_pad_push_event (base->sinkpad, gst_event_ref (flush_event)); GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, flush_event); } else gst_pad_pause_task (base->sinkpad); /* wait for streaming to finish */ GST_PAD_STREAM_LOCK (base->sinkpad); if (flush) { /* send a FLUSH_STOP for the sinkpad, since we need data for seeking */ GST_DEBUG_OBJECT (base, "sending flush stop"); flush_event = gst_event_new_flush_stop (TRUE); gst_event_set_seqnum (flush_event, GST_EVENT_SEQNUM (event)); /* ref for it to be reused later */ gst_pad_push_event (base->sinkpad, gst_event_ref (flush_event)); /* And actually flush our pending data but allow to preserve some info * to perform the seek */ mpegts_base_flush (base, FALSE); mpegts_packetizer_flush (base->packetizer, FALSE); } if (flags & (GST_SEEK_FLAG_SEGMENT)) { GST_WARNING ("seek flags 0x%x are not supported", (int) flags); goto done; } /* If the subclass can seek, do that */ ret = klass->seek (base, event); if (G_UNLIKELY (ret != GST_FLOW_OK)) GST_WARNING ("seeking failed %s", gst_flow_get_name (ret)); else base->last_seek_seqnum = GST_EVENT_SEQNUM (event); if (flush_event) { /* if we sent a FLUSH_START, we now send a FLUSH_STOP */ GST_DEBUG_OBJECT (base, "sending flush stop"); GST_MPEGTS_BASE_GET_CLASS (base)->push_event (base, flush_event); flush_event = NULL; } done: if (flush_event) gst_event_unref (flush_event); gst_pad_start_task (base->sinkpad, (GstTaskFunction) mpegts_base_loop, base, NULL); GST_PAD_STREAM_UNLOCK (base->sinkpad); return ret == GST_FLOW_OK; } static gboolean mpegts_base_sink_activate (GstPad * sinkpad, GstObject * parent) { GstQuery *query; gboolean pull_mode; query = gst_query_new_scheduling (); if (!gst_pad_peer_query (sinkpad, query)) { gst_query_unref (query); goto activate_push; } pull_mode = gst_query_has_scheduling_mode_with_flags (query, GST_PAD_MODE_PULL, GST_SCHEDULING_FLAG_SEEKABLE); gst_query_unref (query); if (!pull_mode) goto activate_push; GST_DEBUG_OBJECT (sinkpad, "activating pull"); return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE); activate_push: { GST_DEBUG_OBJECT (sinkpad, "activating push"); return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE); } } static gboolean mpegts_base_sink_activate_mode (GstPad * pad, GstObject * parent, GstPadMode mode, gboolean active) { gboolean res; MpegTSBase *base = GST_MPEGTS_BASE (parent); switch (mode) { case GST_PAD_MODE_PUSH: base->mode = BASE_MODE_PUSHING; res = TRUE; break; case GST_PAD_MODE_PULL: if (active) { base->mode = BASE_MODE_SCANNING; /* When working pull-based, we always use offsets for estimation */ base->packetizer->calculate_offset = TRUE; base->packetizer->calculate_skew = FALSE; gst_segment_init (&base->segment, GST_FORMAT_BYTES); res = gst_pad_start_task (pad, (GstTaskFunction) mpegts_base_loop, base, NULL); } else res = gst_pad_stop_task (pad); break; default: res = FALSE; break; } return res; } static GstStateChangeReturn mpegts_base_change_state (GstElement * element, GstStateChange transition) { MpegTSBase *base; GstStateChangeReturn ret; base = GST_MPEGTS_BASE (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: mpegts_base_reset (base); break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: mpegts_base_reset (base); if (base->mode != BASE_MODE_PUSHING) base->mode = BASE_MODE_SCANNING; break; default: break; } return ret; } gboolean gst_mpegtsbase_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (mpegts_base_debug, "mpegtsbase", 0, "MPEG transport stream base class"); return TRUE; }