/* * tsdemux.c * Copyright (C) 2009 Zaheer Abbas Merali * 2010 Edward Hervey * * Authors: * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include "mpegtsbase.h" #include "tsdemux.h" #include "gstmpegdesc.h" #include "gstmpegdefs.h" #include "mpegtspacketizer.h" /* latency in mseconds */ #define TS_LATENCY 700 #define TABLE_ID_UNSET 0xFF /* Size of the pendingbuffers array. */ #define TS_MAX_PENDING_BUFFERS 256 GST_DEBUG_CATEGORY_STATIC (ts_demux_debug); #define GST_CAT_DEFAULT ts_demux_debug static GQuark QUARK_TSDEMUX; static GQuark QUARK_PID; static GQuark QUARK_PCR; static GQuark QUARK_OPCR; static GQuark QUARK_PTS; static GQuark QUARK_DTS; static GQuark QUARK_OFFSET; typedef enum { PENDING_PACKET_EMPTY = 0, /* No pending packet/buffer * Push incoming buffers to the array */ PENDING_PACKET_HEADER, /* PES header needs to be parsed * Push incoming buffers to the array */ PENDING_PACKET_BUFFER, /* Currently filling up output buffer * Push incoming buffers to the bufferlist */ PENDING_PACKET_DISCONT /* Discontinuity in incoming packets * Drop all incoming buffers */ } PendingPacketState; typedef struct _TSDemuxStream TSDemuxStream; struct _TSDemuxStream { MpegTSBaseStream stream; GstPad *pad; /* set to FALSE before a push and TRUE after */ gboolean pushed; /* the return of the latest push */ GstFlowReturn flow_return; /* Output data */ PendingPacketState state; /* Pending buffers array. */ /* These buffers are stored in this array until the PES header (if needed) * is succesfully parsed. */ GstBuffer *pendingbuffers[TS_MAX_PENDING_BUFFERS]; guint8 nbpending; /* Current data to be pushed out */ GstBufferList *current; GstBufferListIterator *currentit; GList *currentlist; GstClockTime pts; }; #define VIDEO_CAPS \ GST_STATIC_CAPS (\ "video/mpeg, " \ "mpegversion = (int) { 1, 2, 4 }, " \ "systemstream = (boolean) FALSE; " \ "video/x-h264,stream-format=(string)byte-stream," \ "alignment=(string)nal;" \ "video/x-dirac;" \ "video/x-wmv," \ "wmvversion = (int) 3, " \ "format = (fourcc) WVC1" \ ) #define AUDIO_CAPS \ GST_STATIC_CAPS ( \ "audio/mpeg, " \ "mpegversion = (int) { 1, 4 };" \ "audio/x-lpcm, " \ "width = (int) { 16, 20, 24 }, " \ "rate = (int) { 48000, 96000 }, " \ "channels = (int) [ 1, 8 ], " \ "dynamic_range = (int) [ 0, 255 ], " \ "emphasis = (boolean) { FALSE, TRUE }, " \ "mute = (boolean) { FALSE, TRUE }; " \ "audio/x-ac3; audio/x-eac3;" \ "audio/x-dts;" \ "audio/x-private-ts-lpcm" \ ) /* Can also use the subpicture pads for text subtitles? */ #define SUBPICTURE_CAPS \ GST_STATIC_CAPS ("subpicture/x-pgs; video/x-dvd-subpicture") static GstStaticPadTemplate video_template = GST_STATIC_PAD_TEMPLATE ("video_%04x", GST_PAD_SRC, GST_PAD_SOMETIMES, VIDEO_CAPS); static GstStaticPadTemplate audio_template = GST_STATIC_PAD_TEMPLATE ("audio_%04x", GST_PAD_SRC, GST_PAD_SOMETIMES, AUDIO_CAPS); static GstStaticPadTemplate subpicture_template = GST_STATIC_PAD_TEMPLATE ("subpicture_%04x", GST_PAD_SRC, GST_PAD_SOMETIMES, SUBPICTURE_CAPS); static GstStaticPadTemplate private_template = GST_STATIC_PAD_TEMPLATE ("private_%04x", GST_PAD_SRC, GST_PAD_SOMETIMES, GST_STATIC_CAPS_ANY); enum { ARG_0, PROP_PROGRAM_NUMBER, PROP_EMIT_STATS, /* FILL ME */ }; /* Pad functions */ static const GstQueryType *gst_ts_demux_srcpad_query_types (GstPad * pad); static gboolean gst_ts_demux_srcpad_query (GstPad * pad, GstQuery * query); /* mpegtsbase methods */ static void gst_ts_demux_program_started (MpegTSBase * base, MpegTSBaseProgram * program); static void gst_ts_demux_program_stopped (MpegTSBase * base, MpegTSBaseProgram * program); static GstFlowReturn gst_ts_demux_push (MpegTSBase * base, MpegTSPacketizerPacket * packet, MpegTSPacketizerSection * section); static void gst_ts_demux_stream_added (MpegTSBase * base, MpegTSBaseStream * stream, MpegTSBaseProgram * program); static void gst_ts_demux_stream_removed (MpegTSBase * base, MpegTSBaseStream * stream); static GstFlowReturn find_timestamps (MpegTSBase * base, guint64 initoff, guint64 * offset); static void gst_ts_demux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_ts_demux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_ts_demux_finalize (GObject * object); static GstFlowReturn process_pcr (MpegTSBase * base, guint64 initoff, GstClockTime * pcr, guint numpcr, gboolean isinitial); static gboolean push_event (MpegTSBase * base, GstEvent * event); static void _extra_init (GType type); GST_BOILERPLATE_FULL (GstTSDemux, gst_ts_demux, MpegTSBase, GST_TYPE_MPEGTS_BASE, _extra_init); static void _extra_init (GType type) { QUARK_TSDEMUX = g_quark_from_string ("tsdemux"); QUARK_PID = g_quark_from_string ("pid"); QUARK_PCR = g_quark_from_string ("pcr"); QUARK_OPCR = g_quark_from_string ("opcr"); QUARK_PTS = g_quark_from_string ("pts"); QUARK_DTS = g_quark_from_string ("dts"); QUARK_OFFSET = g_quark_from_string ("offset"); } static void gst_ts_demux_base_init (gpointer klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&video_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&audio_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&subpicture_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&private_template)); gst_element_class_set_details_simple (element_class, "MPEG transport stream demuxer", "Codec/Demuxer", "Demuxes MPEG2 transport streams", "Zaheer Abbas Merali ;" " Edward Hervey "); } static void gst_ts_demux_class_init (GstTSDemuxClass * klass) { GObjectClass *gobject_class; MpegTSBaseClass *ts_class; gobject_class = G_OBJECT_CLASS (klass); gobject_class->set_property = gst_ts_demux_set_property; gobject_class->get_property = gst_ts_demux_get_property; gobject_class->finalize = gst_ts_demux_finalize; g_object_class_install_property (gobject_class, PROP_PROGRAM_NUMBER, g_param_spec_int ("program-number", "Program number", "Program Number to demux for (-1 to ignore)", -1, G_MAXINT, -1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_EMIT_STATS, g_param_spec_boolean ("emit-stats", "Emit statistics", "Emit messages for every pcr/opcr/pts/dts", FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); ts_class = GST_MPEGTS_BASE_CLASS (klass); ts_class->push = GST_DEBUG_FUNCPTR (gst_ts_demux_push); ts_class->push_event = GST_DEBUG_FUNCPTR (push_event); ts_class->program_started = GST_DEBUG_FUNCPTR (gst_ts_demux_program_started); ts_class->program_stopped = GST_DEBUG_FUNCPTR (gst_ts_demux_program_stopped); ts_class->stream_added = gst_ts_demux_stream_added; ts_class->stream_removed = gst_ts_demux_stream_removed; ts_class->find_timestamps = GST_DEBUG_FUNCPTR (find_timestamps); } static void gst_ts_demux_init (GstTSDemux * demux, GstTSDemuxClass * klass) { demux->need_newsegment = TRUE; demux->program_number = -1; demux->duration = GST_CLOCK_TIME_NONE; GST_MPEGTS_BASE (demux)->stream_size = sizeof (TSDemuxStream); } static void gst_ts_demux_finalize (GObject * object) { if (G_OBJECT_CLASS (parent_class)->finalize) G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_ts_demux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstTSDemux *demux = GST_TS_DEMUX (object); switch (prop_id) { case PROP_PROGRAM_NUMBER: /* FIXME: do something if program is switched as opposed to set at * beginning */ demux->program_number = g_value_get_int (value); break; case PROP_EMIT_STATS: demux->emit_statistics = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } } static void gst_ts_demux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstTSDemux *demux = GST_TS_DEMUX (object); switch (prop_id) { case PROP_PROGRAM_NUMBER: g_value_set_int (value, demux->program_number); break; case PROP_EMIT_STATS: g_value_set_boolean (value, demux->emit_statistics); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } } static const GstQueryType * gst_ts_demux_srcpad_query_types (GstPad * pad) { static const GstQueryType query_types[] = { GST_QUERY_DURATION, 0 }; return query_types; } static gboolean gst_ts_demux_srcpad_query (GstPad * pad, GstQuery * query) { gboolean res = TRUE; GstTSDemux *demux; demux = GST_TS_DEMUX (gst_pad_get_parent (pad)); switch (GST_QUERY_TYPE (query)) { case GST_QUERY_DURATION: { GstFormat format; gst_query_parse_duration (query, &format, NULL); /* can only get position in time */ if (format != GST_FORMAT_TIME) goto wrong_format; gst_query_set_duration (query, GST_FORMAT_TIME, demux->duration); break; } default: res = gst_pad_query_default (pad, query); break; } done: gst_object_unref (demux); return res; wrong_format: { GST_DEBUG_OBJECT (demux, "only query duration on TIME is supported"); res = FALSE; goto done; } } static gboolean push_event (MpegTSBase * base, GstEvent * event) { GstTSDemux *demux = (GstTSDemux *) base; guint i; if (G_UNLIKELY (demux->program == NULL)) return FALSE; for (i = 0; i < 0x2000; i++) { if (demux->program->streams[i]) { if (((TSDemuxStream *) demux->program->streams[i])->pad) { gst_event_ref (event); gst_pad_push_event (((TSDemuxStream *) demux->program->streams[i])->pad, event); } } } return TRUE; } static GstFlowReturn tsdemux_combine_flows (GstTSDemux * demux, TSDemuxStream * stream, GstFlowReturn ret) { guint i; /* Store the value */ stream->flow_return = ret; /* any other error that is not-linked can be returned right away */ if (ret != GST_FLOW_NOT_LINKED) goto done; /* Only return NOT_LINKED if all other pads returned NOT_LINKED */ for (i = 0; i < 0x2000; i++) { if (demux->program->streams[i]) { stream = (TSDemuxStream *) demux->program->streams[i]; if (stream->pad) { ret = stream->flow_return; /* some other return value (must be SUCCESS but we can return * other values as well) */ if (ret != GST_FLOW_NOT_LINKED) goto done; } } /* if we get here, all other pads were unlinked and we return * NOT_LINKED then */ } done: return ret; } static GstPad * create_pad_for_stream (MpegTSBase * base, MpegTSBaseStream * bstream, MpegTSBaseProgram * program) { TSDemuxStream *stream = (TSDemuxStream *) bstream; gchar *name = NULL; GstCaps *caps = NULL; GstPadTemplate *template = NULL; guint8 *desc = NULL; GstPad *pad = NULL; GST_LOG ("Attempting to create pad for stream 0x%04x with stream_type %d", bstream->pid, bstream->stream_type); switch (bstream->stream_type) { case ST_VIDEO_MPEG1: case ST_VIDEO_MPEG2: GST_LOG ("mpeg video"); template = gst_static_pad_template_get (&video_template); name = g_strdup_printf ("video_%04x", bstream->pid); caps = gst_caps_new_simple ("video/mpeg", "mpegversion", G_TYPE_INT, bstream->stream_type == ST_VIDEO_MPEG1 ? 1 : 2, "systemstream", G_TYPE_BOOLEAN, FALSE, NULL); break; case ST_AUDIO_MPEG1: case ST_AUDIO_MPEG2: GST_LOG ("mpeg audio"); template = gst_static_pad_template_get (&audio_template); name = g_strdup_printf ("audio_%04x", bstream->pid); caps = gst_caps_new_simple ("audio/mpeg", "mpegversion", G_TYPE_INT, 1, NULL); break; case ST_PRIVATE_DATA: GST_LOG ("private data"); desc = mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream, DESC_DVB_AC3); if (desc) { GST_LOG ("ac3 audio"); template = gst_static_pad_template_get (&audio_template); name = g_strdup_printf ("audio_%04x", bstream->pid); caps = gst_caps_new_simple ("audio/x-ac3", NULL); g_free (desc); break; } desc = mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream, DESC_DVB_ENHANCED_AC3); if (desc) { GST_LOG ("ac3 audio"); template = gst_static_pad_template_get (&audio_template); name = g_strdup_printf ("audio_%04x", bstream->pid); caps = gst_caps_new_simple ("audio/x-eac3", NULL); g_free (desc); break; } desc = mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream, DESC_DVB_TELETEXT); if (desc) { GST_LOG ("teletext"); template = gst_static_pad_template_get (&private_template); name = g_strdup_printf ("private_%04x", bstream->pid); caps = gst_caps_new_simple ("private/teletext", NULL); g_free (desc); break; } desc = mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream, DESC_DVB_SUBTITLING); if (desc) { GST_LOG ("subtitling"); template = gst_static_pad_template_get (&private_template); name = g_strdup_printf ("private_%04x", bstream->pid); caps = gst_caps_new_simple ("subpicture/x-dvb", NULL); g_free (desc); } /* hack for itv hd (sid 10510, video pid 3401 */ if (program->program_number == 10510 && bstream->pid == 3401) { template = gst_static_pad_template_get (&video_template); name = g_strdup_printf ("video_%04x", bstream->pid); caps = gst_caps_new_simple ("video/x-h264", "stream-format", G_TYPE_STRING, "byte-stream", "alignment", G_TYPE_STRING, "nal", NULL); } break; case ST_HDV_AUX_V: /* We don't expose those streams since they're only helper streams */ /* template = gst_static_pad_template_get (&private_template); */ /* name = g_strdup_printf ("private_%04x", bstream->pid); */ /* caps = gst_caps_new_simple ("hdv/aux-v", NULL); */ break; case ST_HDV_AUX_A: /* We don't expose those streams since they're only helper streams */ /* template = gst_static_pad_template_get (&private_template); */ /* name = g_strdup_printf ("private_%04x", bstream->pid); */ /* caps = gst_caps_new_simple ("hdv/aux-a", NULL); */ break; case ST_PRIVATE_SECTIONS: case ST_MHEG: case ST_DSMCC: case ST_DSMCC_A: case ST_DSMCC_B: case ST_DSMCC_C: case ST_DSMCC_D: base->is_pes[bstream->pid] = FALSE; break; case ST_AUDIO_AAC: template = gst_static_pad_template_get (&audio_template); name = g_strdup_printf ("audio_%04x", bstream->pid); caps = gst_caps_new_simple ("audio/mpeg", "mpegversion", G_TYPE_INT, 4, NULL); break; case ST_VIDEO_MPEG4: template = gst_static_pad_template_get (&video_template); name = g_strdup_printf ("video_%04x", bstream->pid); caps = gst_caps_new_simple ("video/mpeg", "mpegversion", G_TYPE_INT, 4, "systemstream", G_TYPE_BOOLEAN, FALSE, NULL); break; case ST_VIDEO_H264: template = gst_static_pad_template_get (&video_template); name = g_strdup_printf ("video_%04x", bstream->pid); caps = gst_caps_new_simple ("video/x-h264", "stream-format", G_TYPE_STRING, "byte-stream", "alignment", G_TYPE_STRING, "nal", NULL); break; case ST_VIDEO_DIRAC: desc = mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream, DESC_REGISTRATION); if (desc) { if (DESC_LENGTH (desc) >= 4) { if (DESC_REGISTRATION_format_identifier (desc) == 0x64726163) { GST_LOG ("dirac"); /* dirac in hex */ template = gst_static_pad_template_get (&video_template); name = g_strdup_printf ("video_%04x", bstream->pid); caps = gst_caps_new_simple ("video/x-dirac", NULL); } } g_free (desc); } break; case ST_PRIVATE_EA: /* Try to detect a VC1 stream */ { desc = mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream, DESC_REGISTRATION); if (desc) { if (DESC_LENGTH (desc) >= 4) { if (DESC_REGISTRATION_format_identifier (desc) == DRF_ID_VC1) { GST_WARNING ("0xea private stream type found but no descriptor " "for VC1. Assuming plain VC1."); template = gst_static_pad_template_get (&video_template); name = g_strdup_printf ("video_%04x", bstream->pid); caps = gst_caps_new_simple ("video/x-wmv", "wmvversion", G_TYPE_INT, 3, "format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('W', 'V', 'C', '1'), NULL); } } g_free (desc); } break; } case ST_BD_AUDIO_AC3: { /* REGISTRATION DRF_ID_HDMV */ desc = mpegts_get_descriptor_from_program (program, DESC_REGISTRATION); if (desc) { if (DESC_REGISTRATION_format_identifier (desc) == DRF_ID_HDMV) { template = gst_static_pad_template_get (&audio_template); name = g_strdup_printf ("audio_%04x", bstream->pid); caps = gst_caps_new_simple ("audio/x-eac3", NULL); } g_free (desc); } if (template) break; /* DVB_ENHANCED_AC3 */ desc = mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream, DESC_DVB_ENHANCED_AC3); if (desc) { template = gst_static_pad_template_get (&audio_template); name = g_strdup_printf ("audio_%04x", bstream->pid); caps = gst_caps_new_simple ("audio/x-eac3", NULL); g_free (desc); break; } /* DVB_AC3 */ desc = mpegts_get_descriptor_from_stream ((MpegTSBaseStream *) stream, DESC_DVB_AC3); if (!desc) GST_WARNING ("AC3 stream type found but no corresponding " "descriptor to differentiate between AC3 and EAC3. " "Assuming plain AC3."); else g_free (desc); template = gst_static_pad_template_get (&audio_template); name = g_strdup_printf ("audio_%04x", bstream->pid); caps = gst_caps_new_simple ("audio/x-ac3", NULL); break; } case ST_BD_AUDIO_EAC3: template = gst_static_pad_template_get (&audio_template); name = g_strdup_printf ("audio_%04x", bstream->pid); caps = gst_caps_new_simple ("audio/x-eac3", NULL); break; case ST_PS_AUDIO_DTS: template = gst_static_pad_template_get (&audio_template); name = g_strdup_printf ("audio_%04x", bstream->pid); caps = gst_caps_new_simple ("audio/x-dts", NULL); break; case ST_PS_AUDIO_LPCM: template = gst_static_pad_template_get (&audio_template); name = g_strdup_printf ("audio_%04x", bstream->pid); caps = gst_caps_new_simple ("audio/x-lpcm", NULL); break; case ST_BD_AUDIO_LPCM: template = gst_static_pad_template_get (&audio_template); name = g_strdup_printf ("audio_%04x", bstream->pid); caps = gst_caps_new_simple ("audio/x-private-ts-lpcm", NULL); break; case ST_PS_DVD_SUBPICTURE: template = gst_static_pad_template_get (&subpicture_template); name = g_strdup_printf ("subpicture_%04x", bstream->pid); caps = gst_caps_new_simple ("video/x-dvd-subpicture", NULL); break; case ST_BD_PGS_SUBPICTURE: template = gst_static_pad_template_get (&subpicture_template); name = g_strdup_printf ("subpicture_%04x", bstream->pid); caps = gst_caps_new_simple ("subpicture/x-pgs", NULL); break; } if (template && name && caps) { GST_LOG ("stream:%p creating pad with name %s and caps %s", stream, name, gst_caps_to_string (caps)); pad = gst_pad_new_from_template (template, name); gst_pad_use_fixed_caps (pad); gst_pad_set_caps (pad, caps); gst_pad_set_query_type_function (pad, gst_ts_demux_srcpad_query_types); gst_pad_set_query_function (pad, gst_ts_demux_srcpad_query); gst_caps_unref (caps); } g_free (name); return pad; } static void gst_ts_demux_stream_added (MpegTSBase * base, MpegTSBaseStream * bstream, MpegTSBaseProgram * program) { TSDemuxStream *stream = (TSDemuxStream *) bstream; if (!stream->pad) { /* Create the pad */ if (bstream->stream_type != 0xff) stream->pad = create_pad_for_stream (base, bstream, program); stream->pts = GST_CLOCK_TIME_NONE; } stream->flow_return = GST_FLOW_OK; } static void gst_ts_demux_stream_removed (MpegTSBase * base, MpegTSBaseStream * bstream) { TSDemuxStream *stream = (TSDemuxStream *) bstream; if (stream) { if (stream->pad) { /* Unref the pad, clear it */ gst_object_unref (stream->pad); stream->pad = NULL; } stream->flow_return = GST_FLOW_NOT_LINKED; } } static void activate_pad_for_stream (GstTSDemux * tsdemux, TSDemuxStream * stream) { if (stream->pad) { GST_DEBUG_OBJECT (tsdemux, "Activating pad %s:%s for stream %p", GST_DEBUG_PAD_NAME (stream->pad), stream); gst_pad_set_active (stream->pad, TRUE); gst_element_add_pad ((GstElement *) tsdemux, stream->pad); GST_DEBUG_OBJECT (stream->pad, "done adding pad"); } else GST_WARNING_OBJECT (tsdemux, "stream %p has no pad", stream); } static void gst_ts_demux_program_started (MpegTSBase * base, MpegTSBaseProgram * program) { GstTSDemux *demux = GST_TS_DEMUX (base); if (demux->program_number == -1 || demux->program_number == program->program_number) { guint i; GST_LOG ("program %d started", program->program_number); demux->program_number = program->program_number; demux->program = program; /* Activate all stream pads, the pads will already have been created */ /* FIXME : Actually, we don't want to activate *ALL* streams ! * For example, we don't want to expose HDV AUX private streams, we will just * be using them directly for seeking and metadata. */ if (base->mode != BASE_MODE_SCANNING) for (i = 0; i < 0x2000; i++) if (program->streams[i]) activate_pad_for_stream (demux, (TSDemuxStream *) program->streams[i]); /* Inform scanner we have got our program */ demux->current_program_number = program->program_number; } } static void gst_ts_demux_program_stopped (MpegTSBase * base, MpegTSBaseProgram * program) { guint i; GstTSDemux *demux = GST_TS_DEMUX (base); TSDemuxStream *localstream = NULL; GST_LOG ("program %d stopped", program->program_number); if (program != demux->program) return; for (i = 0; i < 0x2000; i++) { if (demux->program->streams[i]) { localstream = (TSDemuxStream *) program->streams[i]; if (localstream->pad) { GST_DEBUG ("HAVE PAD %s:%s", GST_DEBUG_PAD_NAME (localstream->pad)); if (gst_pad_is_active (localstream->pad)) gst_element_remove_pad (GST_ELEMENT_CAST (demux), localstream->pad); else gst_object_unref (localstream->pad); localstream->pad = NULL; } } } demux->program = NULL; demux->program_number = -1; } static gboolean process_section (MpegTSBase * base) { GstTSDemux *demux = GST_TS_DEMUX (base); gboolean based; gboolean done = FALSE; MpegTSPacketizerPacket packet; MpegTSPacketizerPacketReturn pret; while ((!done) && ((pret = mpegts_packetizer_next_packet (base->packetizer, &packet)) != PACKET_NEED_MORE)) { if (G_UNLIKELY (pret == PACKET_BAD)) /* bad header, skip the packet */ goto next; /* base PSI data */ if (packet.payload != NULL && mpegts_base_is_psi (base, &packet)) { MpegTSPacketizerSection section; based = mpegts_packetizer_push_section (base->packetizer, &packet, §ion); if (G_UNLIKELY (!based)) /* bad section data */ goto next; if (G_LIKELY (section.complete)) { /* section complete */ GST_DEBUG ("Section Complete"); based = mpegts_base_handle_psi (base, §ion); gst_buffer_unref (section.buffer); if (G_UNLIKELY (!based)) /* bad PSI table */ goto next; } if (demux->program != NULL) { GST_DEBUG ("Got Program"); done = TRUE; } } next: mpegts_packetizer_clear_packet (base->packetizer, &packet); } return done; } static GstFlowReturn find_timestamps (MpegTSBase * base, guint64 initoff, guint64 * offset) { GstFlowReturn ret = GST_FLOW_OK; GstBuffer *buf; gboolean done = FALSE; GstFormat format = GST_FORMAT_BYTES; gint64 total_bytes; guint64 scan_offset; guint i = 0; GstClockTime initial, final; GstTSDemux *demux = GST_TS_DEMUX (base); GST_DEBUG ("Scanning for timestamps"); /* Flush what remained from before */ mpegts_packetizer_clear (base->packetizer); /* Start scanning from know PAT offset */ while (!done) { ret = gst_pad_pull_range (base->sinkpad, i * 50 * MPEGTS_MAX_PACKETSIZE, 50 * MPEGTS_MAX_PACKETSIZE, &buf); if (ret != GST_FLOW_OK) goto beach; mpegts_packetizer_push (base->packetizer, buf); done = process_section (base); i++; } mpegts_packetizer_clear (base->packetizer); done = FALSE; i = 1; *offset = base->seek_offset; /* Search for the first PCRs */ ret = process_pcr (base, base->first_pat_offset, &initial, 10, TRUE); mpegts_packetizer_clear (base->packetizer); /* Remove current program so we ensure looking for a PAT when scanning the * for the final PCR */ mpegts_base_remove_program (base, demux->current_program_number); if (ret != GST_FLOW_OK) { GST_WARNING ("Problem getting initial PCRs"); goto beach; } /* Find end position */ if (G_UNLIKELY (!gst_pad_query_peer_duration (base->sinkpad, &format, &total_bytes) || format != GST_FORMAT_BYTES)) { GST_WARNING_OBJECT (base, "Couldn't get upstream size in bytes"); ret = GST_FLOW_ERROR; mpegts_packetizer_clear (base->packetizer); return ret; } GST_DEBUG ("Upstream is %" G_GINT64_FORMAT " bytes", total_bytes); scan_offset = total_bytes - 4000 * MPEGTS_MAX_PACKETSIZE; GST_DEBUG ("Scanning for last sync point between:%" G_GINT64_FORMAT " and the end:%" G_GINT64_FORMAT, scan_offset, total_bytes); while ((!done) && (scan_offset < total_bytes)) { ret = gst_pad_pull_range (base->sinkpad, scan_offset, 50 * MPEGTS_MAX_PACKETSIZE, &buf); if (ret != GST_FLOW_OK) goto beach; mpegts_packetizer_push (base->packetizer, buf); done = process_section (base); scan_offset += 50 * MPEGTS_MAX_PACKETSIZE; } mpegts_packetizer_clear (base->packetizer); GST_DEBUG ("Searching PCR"); ret = process_pcr (base, total_bytes - 4000 * MPEGTS_MAX_PACKETSIZE, &final, 10, FALSE); if (ret != GST_FLOW_OK) { GST_DEBUG ("Problem getting last PCRs"); goto beach; } demux->duration = final - initial; GST_DEBUG ("Done, duration:%" GST_TIME_FORMAT, GST_TIME_ARGS (demux->duration)); beach: mpegts_packetizer_clear (base->packetizer); /* Remove current program */ mpegts_base_remove_program (base, demux->current_program_number); return ret; } static GstFlowReturn process_pcr (MpegTSBase * base, guint64 initoff, GstClockTime * pcr, guint numpcr, gboolean isinitial) { GstTSDemux *demux = GST_TS_DEMUX (base); GstFlowReturn ret = GST_FLOW_OK; MpegTSBaseProgram *program; GstBuffer *buf; guint nbpcr, i = 0; guint32 pcrmask, pcrpattern; guint64 pcrs[50]; guint64 pcroffs[50]; GstByteReader br; GST_DEBUG ("initoff:%" G_GUINT64_FORMAT ", numpcr:%d, isinitial:%d", initoff, numpcr, isinitial); /* Get the program */ program = demux->program; if (G_UNLIKELY (program == NULL)) return GST_FLOW_ERROR; /* First find the first X PCR */ nbpcr = 0; /* Mask/pattern is PID:PCR_PID, AFC&0x02 */ /* sync_byte (0x47) : 8bits => 0xff * transport_error_indicator : 1bit ACTIVATE * payload_unit_start_indicator : 1bit IGNORE * transport_priority : 1bit IGNORE * PID : 13bit => 0x9f 0xff * transport_scrambling_control : 2bit * adaptation_field_control : 2bit * continuity_counter : 4bit => 0x30 */ pcrmask = 0xff9fff20; pcrpattern = 0x47000020 | ((program->pcr_pid & 0x1fff) << 8); for (i = 0; (i < 20) && (nbpcr < numpcr); i++) { guint offset, size; ret = gst_pad_pull_range (base->sinkpad, initoff + i * 500 * base->packetsize, 500 * base->packetsize, &buf); if (G_UNLIKELY (ret != GST_FLOW_OK)) goto beach; gst_byte_reader_init_from_buffer (&br, buf); offset = 0; size = GST_BUFFER_SIZE (buf); /* FIXME : We should jump to next packet instead of scanning everything */ while ((size >= br.size) && (nbpcr < numpcr) && (offset = gst_byte_reader_masked_scan_uint32 (&br, pcrmask, pcrpattern, offset, size)) != -1) { /* Potential PCR */ /* GST_DEBUG ("offset %" G_GUINT64_FORMAT, GST_BUFFER_OFFSET (buf) + offset); GST_MEMDUMP ("something", GST_BUFFER_DATA (buf) + offset, 16);*/ if ((*(br.data + offset + 5)) & 0x10) { guint16 pcr2; guint64 pcr, pcr_ext; pcr = ((guint64) GST_READ_UINT32_BE (br.data + offset + 6)) << 1; pcr2 = GST_READ_UINT16_BE (br.data + offset + 10); pcr |= (pcr2 & 0x8000) >> 15; pcr_ext = (pcr2 & 0x01ff); pcr = pcr * 300 + pcr_ext % 300; GST_DEBUG ("Found PCR %" G_GUINT64_FORMAT " %" GST_TIME_FORMAT " at offset %" G_GUINT64_FORMAT, pcr, GST_TIME_ARGS (PCRTIME_TO_GSTTIME (pcr)), GST_BUFFER_OFFSET (buf) + offset); pcrs[nbpcr] = pcr; pcroffs[nbpcr] = GST_BUFFER_OFFSET (buf) + offset; /* Safeguard against bogus PCR (by detecting if it's the same as the * previous one or wheter the difference with the previous one is * greater than 10mins */ if (nbpcr > 1) { if (pcrs[nbpcr] == pcrs[nbpcr - 1]) { GST_WARNING ("Found same PCR at different offset"); } else if ((pcrs[nbpcr] - pcrs[nbpcr - 1]) > (guint64) 10 * 60 * 27000000) { GST_WARNING ("PCR differs with previous PCR by more than 10 mins"); } else nbpcr += 1; } else nbpcr += 1; } /* Move offset forward by 1 */ size -= offset + 1; offset += 1; } } beach: GST_DEBUG ("Found %d PCR", nbpcr); if (nbpcr) { if (isinitial) *pcr = PCRTIME_TO_GSTTIME (pcrs[0]); else *pcr = PCRTIME_TO_GSTTIME (pcrs[nbpcr - 1]); GST_DEBUG ("pcrdiff:%" GST_TIME_FORMAT " offsetdiff %" G_GUINT64_FORMAT, GST_TIME_ARGS (PCRTIME_TO_GSTTIME (pcrs[nbpcr - 1] - pcrs[0])), pcroffs[nbpcr - 1] - pcroffs[0]); GST_DEBUG ("Estimated bitrate %" G_GUINT64_FORMAT, gst_util_uint64_scale (GST_SECOND, pcroffs[nbpcr - 1] - pcroffs[0], PCRTIME_TO_GSTTIME (pcrs[nbpcr - 1] - pcrs[0]))); GST_DEBUG ("Average PCR interval %" G_GUINT64_FORMAT, (pcroffs[nbpcr - 1] - pcroffs[0]) / nbpcr); } /* Swallow any errors if it happened during the end scanning */ if (!isinitial) ret = GST_FLOW_OK; return ret; } static inline void gst_ts_demux_record_pcr (GstTSDemux * demux, TSDemuxStream * stream, guint64 pcr, guint64 offset) { MpegTSBaseStream *bs = (MpegTSBaseStream *) stream; GST_LOG ("pid 0x%04x pcr:%" GST_TIME_FORMAT " at offset %" G_GUINT64_FORMAT, bs->pid, GST_TIME_ARGS (PCRTIME_TO_GSTTIME (pcr)), offset); if (G_UNLIKELY (demux->emit_statistics)) { GstStructure *st; st = gst_structure_id_empty_new (QUARK_TSDEMUX); gst_structure_id_set (st, QUARK_PID, G_TYPE_UINT, bs->pid, QUARK_OFFSET, G_TYPE_UINT64, offset, QUARK_PCR, G_TYPE_UINT64, pcr, NULL); gst_element_post_message (GST_ELEMENT_CAST (demux), gst_message_new_element (GST_OBJECT (demux), st)); } } static inline void gst_ts_demux_record_opcr (GstTSDemux * demux, TSDemuxStream * stream, guint64 opcr, guint64 offset) { MpegTSBaseStream *bs = (MpegTSBaseStream *) stream; GST_LOG ("pid 0x%04x opcr:%" GST_TIME_FORMAT " at offset %" G_GUINT64_FORMAT, bs->pid, GST_TIME_ARGS (PCRTIME_TO_GSTTIME (opcr)), offset); if (G_UNLIKELY (demux->emit_statistics)) { GstStructure *st; st = gst_structure_id_empty_new (QUARK_TSDEMUX); gst_structure_id_set (st, QUARK_PID, G_TYPE_UINT, bs->pid, QUARK_OFFSET, G_TYPE_UINT64, offset, QUARK_OPCR, G_TYPE_UINT64, opcr, NULL); gst_element_post_message (GST_ELEMENT_CAST (demux), gst_message_new_element (GST_OBJECT (demux), st)); } } static inline void gst_ts_demux_record_pts (GstTSDemux * demux, TSDemuxStream * stream, guint64 pts, guint64 offset) { MpegTSBaseStream *bs = (MpegTSBaseStream *) stream; GST_LOG ("pid 0x%04x pts:%" GST_TIME_FORMAT " at offset %" G_GUINT64_FORMAT, bs->pid, GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (pts)), offset); if (G_UNLIKELY (demux->emit_statistics)) { GstStructure *st; st = gst_structure_id_empty_new (QUARK_TSDEMUX); gst_structure_id_set (st, QUARK_PID, G_TYPE_UINT, bs->pid, QUARK_OFFSET, G_TYPE_UINT64, offset, QUARK_PTS, G_TYPE_UINT64, pts, NULL); gst_element_post_message (GST_ELEMENT_CAST (demux), gst_message_new_element (GST_OBJECT (demux), st)); } } static inline void gst_ts_demux_record_dts (GstTSDemux * demux, TSDemuxStream * stream, guint64 dts, guint64 offset) { MpegTSBaseStream *bs = (MpegTSBaseStream *) stream; GST_LOG ("pid 0x%04x dts:%" GST_TIME_FORMAT " at offset %" G_GUINT64_FORMAT, bs->pid, GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (dts)), offset); if (G_UNLIKELY (demux->emit_statistics)) { GstStructure *st; st = gst_structure_id_empty_new (QUARK_TSDEMUX); gst_structure_id_set (st, QUARK_PID, G_TYPE_UINT, bs->pid, QUARK_OFFSET, G_TYPE_UINT64, offset, QUARK_DTS, G_TYPE_UINT64, dts, NULL); gst_element_post_message (GST_ELEMENT_CAST (demux), gst_message_new_element (GST_OBJECT (demux), st)); } } static GstFlowReturn gst_ts_demux_parse_pes_header (GstTSDemux * demux, TSDemuxStream * stream) { GstFlowReturn res = GST_FLOW_OK; guint8 *data; guint32 length; guint32 psc_stid; guint8 stid; guint16 pesplength; guint8 PES_header_data_length = 0; data = GST_BUFFER_DATA (stream->pendingbuffers[0]); length = GST_BUFFER_SIZE (stream->pendingbuffers[0]); GST_MEMDUMP ("Header buffer", data, MIN (length, 32)); /* packet_start_code_prefix 24 * stream_id 8*/ psc_stid = GST_READ_UINT32_BE (data); data += 4; length -= 4; if (G_UNLIKELY ((psc_stid & 0xffffff00) != 0x00000100)) { GST_WARNING ("WRONG PACKET START CODE! pid: 0x%x stream_type: 0x%x", stream->stream.pid, stream->stream.stream_type); goto discont; } stid = psc_stid & 0x000000ff; GST_LOG ("stream_id:0x%02x", stid); /* PES_packet_length 16 */ /* FIXME : store the expected pes length somewhere ? */ pesplength = GST_READ_UINT16_BE (data); data += 2; length -= 2; GST_LOG ("PES_packet_length:%d", pesplength); /* FIXME : Only parse header on streams which require it (see table 2-21) */ if (stid != 0xbf) { guint8 p1, p2; guint64 pts, dts; p1 = *data++; p2 = *data++; PES_header_data_length = *data++ + 3; length -= 3; GST_LOG ("0x%02x 0x%02x 0x%02x", p1, p2, PES_header_data_length); GST_LOG ("PES header data length:%d", PES_header_data_length); /* '10' 2 * PES_scrambling_control 2 * PES_priority 1 * data_alignment_indicator 1 * copyright 1 * original_or_copy 1 */ if (G_UNLIKELY ((p1 & 0xc0) != 0x80)) { GST_WARNING ("p1 >> 6 != 0x2"); goto discont; } /* PTS_DTS_flags 2 * ESCR_flag 1 * ES_rate_flag 1 * DSM_trick_mode_flag 1 * additional_copy_info_flag 1 * PES_CRC_flag 1 * PES_extension_flag 1*/ /* PES_header_data_length 8 */ if (G_UNLIKELY (length < PES_header_data_length)) { GST_WARNING ("length < PES_header_data_length"); goto discont; } /* PTS 32 */ if ((p2 & 0x80)) { /* PTS */ READ_TS (data, pts, discont); gst_ts_demux_record_pts (demux, stream, pts, GST_BUFFER_OFFSET (stream->pendingbuffers[0])); length -= 4; GST_BUFFER_TIMESTAMP (stream->pendingbuffers[0]) = MPEGTIME_TO_GSTTIME (pts); if (!GST_CLOCK_TIME_IS_VALID (stream->pts)) { stream->pts = GST_BUFFER_TIMESTAMP (stream->pendingbuffers[0]); } } /* DTS 32 */ if ((p2 & 0x40)) { /* DTS */ READ_TS (data, dts, discont); gst_ts_demux_record_dts (demux, stream, dts, GST_BUFFER_OFFSET (stream->pendingbuffers[0])); length -= 4; } /* ESCR 48 */ if ((p2 & 0x20)) { GST_LOG ("ESCR present"); data += 6; length -= 6; } /* ES_rate 24 */ if ((p2 & 0x10)) { GST_LOG ("ES_rate present"); data += 3; length -= 3; } /* DSM_trick_mode 8 */ if ((p2 & 0x08)) { GST_LOG ("DSM_trick_mode present"); data += 1; length -= 1; } } /* Remove PES headers */ GST_BUFFER_DATA (stream->pendingbuffers[0]) += 6 + PES_header_data_length; GST_BUFFER_SIZE (stream->pendingbuffers[0]) -= 6 + PES_header_data_length; /* FIXME : responsible for switching to PENDING_PACKET_BUFFER and * creating the bufferlist */ if (1) { /* Append to the buffer list */ if (G_UNLIKELY (stream->current == NULL)) { guint8 i; /* Create a new bufferlist */ stream->current = gst_buffer_list_new (); stream->currentit = gst_buffer_list_iterate (stream->current); stream->currentlist = NULL; gst_buffer_list_iterator_add_group (stream->currentit); /* Push pending buffers into the list */ for (i = stream->nbpending; i; i--) stream->currentlist = g_list_prepend (stream->currentlist, stream->pendingbuffers[i - 1]); memset (stream->pendingbuffers, 0, TS_MAX_PENDING_BUFFERS); stream->nbpending = 0; } stream->state = PENDING_PACKET_BUFFER; } return res; discont: stream->state = PENDING_PACKET_DISCONT; return res; } /* ONLY CALL THIS: * * WITH packet->payload != NULL * * WITH pending/current flushed out if beginning of new PES packet */ static inline void gst_ts_demux_queue_data (GstTSDemux * demux, TSDemuxStream * stream, MpegTSPacketizerPacket * packet) { GstBuffer *buf; GST_DEBUG ("state:%d", stream->state); buf = packet->buffer; /* HACK : Instead of creating a new buffer, we just modify the data/size * of the buffer to point to the payload */ GST_BUFFER_DATA (buf) = packet->payload; GST_BUFFER_SIZE (buf) = packet->data_end - packet->payload; if (stream->state == PENDING_PACKET_EMPTY) { if (G_UNLIKELY (!packet->payload_unit_start_indicator)) { stream->state = PENDING_PACKET_DISCONT; GST_WARNING ("Didn't get the first packet of this PES"); } else { GST_LOG ("EMPTY=>HEADER"); stream->state = PENDING_PACKET_HEADER; if (stream->pad) { GST_DEBUG ("Setting pad caps on buffer %p", buf); gst_buffer_set_caps (buf, GST_PAD_CAPS (stream->pad)); } } } if (stream->state == PENDING_PACKET_HEADER) { GST_LOG ("HEADER: appending data to array"); /* Append to the array */ stream->pendingbuffers[stream->nbpending++] = buf; /* parse the header */ gst_ts_demux_parse_pes_header (demux, stream); } else if (stream->state == PENDING_PACKET_BUFFER) { GST_LOG ("BUFFER: appending data to bufferlist"); stream->currentlist = g_list_prepend (stream->currentlist, buf); } return; } static GstFlowReturn gst_ts_demux_push_pending_data (GstTSDemux * demux, TSDemuxStream * stream) { GstFlowReturn res = GST_FLOW_OK; MpegTSBaseStream *bs = (MpegTSBaseStream *) stream; guint i; GstClockTime tinypts = GST_CLOCK_TIME_NONE; GstClockTime stop = GST_CLOCK_TIME_NONE; GstEvent *newsegmentevent; GST_DEBUG ("stream:%p, pid:0x%04x stream_type:%d state:%d pad:%s:%s", stream, bs->pid, bs->stream_type, stream->state, GST_DEBUG_PAD_NAME (stream->pad)); if (G_UNLIKELY (stream->current == NULL)) { GST_LOG ("stream->current == NULL"); goto beach; } if (G_UNLIKELY (stream->state == PENDING_PACKET_EMPTY)) { GST_LOG ("EMPTY: returning"); goto beach; } /* We have a confirmed buffer, let's push it out */ if (stream->state == PENDING_PACKET_BUFFER) { GST_LOG ("BUFFER: pushing out pending data"); stream->currentlist = g_list_reverse (stream->currentlist); gst_buffer_list_iterator_add_list (stream->currentit, stream->currentlist); gst_buffer_list_iterator_free (stream->currentit); if (stream->pad) { if (demux->need_newsegment) { for (i = 0; i < 0x2000; i++) { if (demux->program->streams[i]) { if ((!GST_CLOCK_TIME_IS_VALID (tinypts)) || (((TSDemuxStream *) demux->program->streams[i])->pts < tinypts)) tinypts = ((TSDemuxStream *) demux->program->streams[i])->pts; } } if (GST_CLOCK_TIME_IS_VALID (demux->duration)) stop = tinypts + demux->duration; GST_DEBUG ("Sending newsegment event"); newsegmentevent = gst_event_new_new_segment (0, 1.0, GST_FORMAT_TIME, tinypts, stop, 0); push_event ((MpegTSBase *) demux, newsegmentevent); demux->need_newsegment = FALSE; } GST_DEBUG_OBJECT (stream->pad, "Pushing buffer list "); res = gst_pad_push_list (stream->pad, stream->current); GST_DEBUG_OBJECT (stream->pad, "Returned %s", gst_flow_get_name (res)); /* FIXME : combine flow returns */ res = tsdemux_combine_flows (demux, stream, res); GST_DEBUG_OBJECT (stream->pad, "combined %s", gst_flow_get_name (res)); } else { gst_buffer_list_unref (stream->current); } } beach: /* Reset everything */ GST_LOG ("Resetting to EMPTY"); stream->state = PENDING_PACKET_EMPTY; /* for (i = 0; i < stream->nbpending; i++) */ /* gst_buffer_unref (stream->pendingbuffers[i]); */ memset (stream->pendingbuffers, 0, TS_MAX_PENDING_BUFFERS); stream->nbpending = 0; stream->current = NULL; return res; } static GstFlowReturn gst_ts_demux_handle_packet (GstTSDemux * demux, TSDemuxStream * stream, MpegTSPacketizerPacket * packet, MpegTSPacketizerSection * section) { GstFlowReturn res = GST_FLOW_OK; GST_DEBUG ("buffer:%p, data:%p", GST_BUFFER_DATA (packet->buffer), packet->data); GST_LOG ("pid 0x%04x pusi:%d, afc:%d, cont:%d, payload:%p", packet->pid, packet->payload_unit_start_indicator, packet->adaptation_field_control, packet->continuity_counter, packet->payload); if (section) { GST_DEBUG ("section complete:%d, buffer size %d", section->complete, GST_BUFFER_SIZE (section->buffer)); gst_buffer_unref (packet->buffer); return res; } if (G_UNLIKELY (packet->payload_unit_start_indicator)) /* Flush previous data */ res = gst_ts_demux_push_pending_data (demux, stream); if (packet->adaptation_field_control & 0x2) { if (packet->afc_flags & MPEGTS_AFC_PCR_FLAG) gst_ts_demux_record_pcr (demux, stream, packet->pcr, GST_BUFFER_OFFSET (packet->buffer)); if (packet->afc_flags & MPEGTS_AFC_OPCR_FLAG) gst_ts_demux_record_opcr (demux, stream, packet->opcr, GST_BUFFER_OFFSET (packet->buffer)); } if (packet->payload) gst_ts_demux_queue_data (demux, stream, packet); else gst_buffer_unref (packet->buffer); return res; } static GstFlowReturn gst_ts_demux_push (MpegTSBase * base, MpegTSPacketizerPacket * packet, MpegTSPacketizerSection * section) { GstTSDemux *demux = GST_TS_DEMUX_CAST (base); TSDemuxStream *stream = NULL; GstFlowReturn res = GST_FLOW_OK; if (G_LIKELY (demux->program)) { stream = (TSDemuxStream *) demux->program->streams[packet->pid]; if (stream) { res = gst_ts_demux_handle_packet (demux, stream, packet, section); } else if (packet->buffer) gst_buffer_unref (packet->buffer); } else { if (packet->buffer) gst_buffer_unref (packet->buffer); } return res; } gboolean gst_ts_demux_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (ts_demux_debug, "tsdemux", 0, "MPEG transport stream demuxer"); return gst_element_register (plugin, "tsdemux", GST_RANK_SECONDARY, GST_TYPE_TS_DEMUX); }