/* GStreamer * Copyright (C) <1999> Erik Walthinsen * * 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 "gstmpegparse.h" #include "gstmpegclock.h" static GstFormat scr_format; GST_DEBUG_CATEGORY_STATIC (gstmpegparse_debug); #define GST_CAT_DEFAULT (gstmpegparse_debug) GST_DEBUG_CATEGORY_EXTERN (GST_CAT_SEEK); #define MP_INVALID_SCR ((guint64)(-1)) #define MP_MUX_RATE_MULT 50 #define MP_MIN_VALID_BSS 8192 #define MP_MAX_VALID_BSS 16384 /* * Hysteresis value to limit the * total predicted time skipping about */ #define MP_SCR_RATE_HYST 0.08 /* elementfactory information */ static GstElementDetails mpeg_parse_details = { "MPEG System Parser", "Codec/Parser", "Parses MPEG1 and MPEG2 System Streams", "Erik Walthinsen \n" "Wim Taymans " }; #define CLASS(o) GST_MPEG_PARSE_CLASS (G_OBJECT_GET_CLASS (o)) #define DEFAULT_MAX_SCR_GAP 120000 /* GstMPEGParse signals and args */ enum { SIGNAL_REACHED_OFFSET, LAST_SIGNAL }; enum { ARG_0, ARG_MAX_SCR_GAP, ARG_BYTE_OFFSET, ARG_TIME_OFFSET /* FILL ME */ }; static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/mpeg, " "mpegversion = (int) [ 1, 2 ], " "systemstream = (boolean) TRUE") ); static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/mpeg, " "mpegversion = (int) [ 1, 2 ], " "systemstream = (boolean) TRUE") ); #define _do_init(bla) \ GST_DEBUG_CATEGORY_INIT (gstmpegparse_debug, "mpegparse", 0, \ "MPEG parser element"); GST_BOILERPLATE_FULL (GstMPEGParse, gst_mpeg_parse, GstElement, GST_TYPE_ELEMENT, _do_init); static void gst_mpeg_parse_class_init (GstMPEGParseClass * klass); static GstStateChangeReturn gst_mpeg_parse_change_state (GstElement * element, GstStateChange transition); static gboolean gst_mpeg_parse_parse_packhead (GstMPEGParse * mpeg_parse, GstBuffer * buffer); static void gst_mpeg_parse_reset (GstMPEGParse * mpeg_parse); static GstClockTime gst_mpeg_parse_adjust_ts (GstMPEGParse * mpeg_parse, GstClockTime ts); static GstFlowReturn gst_mpeg_parse_send_buffer (GstMPEGParse * mpeg_parse, GstBuffer * buffer, GstClockTime time); static GstFlowReturn gst_mpeg_parse_process_event (GstMPEGParse * mpeg_parse, GstEvent * event); static gboolean gst_mpeg_parse_send_event (GstMPEGParse * mpeg_parse, GstEvent * event); static void gst_mpeg_parse_pad_added (GstElement * element, GstPad * pad); static gboolean gst_mpeg_parse_event (GstPad * pad, GstEvent * event); static GstFlowReturn gst_mpeg_parse_chain (GstPad * pad, GstBuffer * buf); static void gst_mpeg_parse_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_mpeg_parse_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_mpeg_parse_set_index (GstElement * element, GstIndex * index); static GstIndex *gst_mpeg_parse_get_index (GstElement * element); static guint gst_mpeg_parse_signals[LAST_SIGNAL] = { 0 }; static void gst_mpeg_parse_base_init (gpointer klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_set_details (element_class, &mpeg_parse_details); } static void gst_mpeg_parse_class_init (GstMPEGParseClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; parent_class = g_type_class_peek_parent (klass); gst_mpeg_parse_signals[SIGNAL_REACHED_OFFSET] = g_signal_new ("reached-offset", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST, G_STRUCT_OFFSET (GstMPEGParseClass, reached_offset), NULL, NULL, gst_marshal_VOID__VOID, G_TYPE_NONE, 0); gobject_class->get_property = gst_mpeg_parse_get_property; gobject_class->set_property = gst_mpeg_parse_set_property; gstelement_class->pad_added = gst_mpeg_parse_pad_added; gstelement_class->change_state = gst_mpeg_parse_change_state; gstelement_class->get_index = gst_mpeg_parse_get_index; gstelement_class->set_index = gst_mpeg_parse_set_index; klass->parse_packhead = gst_mpeg_parse_parse_packhead; klass->parse_syshead = NULL; klass->parse_packet = NULL; klass->parse_pes = NULL; klass->adjust_ts = gst_mpeg_parse_adjust_ts; klass->send_buffer = gst_mpeg_parse_send_buffer; klass->process_event = gst_mpeg_parse_process_event; klass->send_event = gst_mpeg_parse_send_event; /* FIXME: this is a hack. We add the pad templates here instead * in the base_init function, since the derived class (mpegdemux) * uses different pads. IMO, this is wrong. */ gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&src_factory)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&sink_factory)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MAX_SCR_GAP, g_param_spec_int ("max_scr_gap", "Max SCR gap", "Maximum allowed gap between expected and actual " "SCR values. -1 means never adjust.", -1, G_MAXINT, DEFAULT_MAX_SCR_GAP, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BYTE_OFFSET, g_param_spec_uint64 ("byte-offset", "Byte Offset", "Emit reached-offset signal when the byte offset is reached.", 0, G_MAXUINT64, G_MAXUINT64, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TIME_OFFSET, g_param_spec_uint64 ("time-offset", "Time Offset", "Time offset in the stream.", 0, G_MAXUINT64, G_MAXUINT64, G_PARAM_READABLE)); } static void gst_mpeg_parse_init (GstMPEGParse * mpeg_parse, GstMPEGParseClass * klass) { GstElementClass *gstelement_class; GstPadTemplate *templ; gstelement_class = GST_ELEMENT_GET_CLASS (mpeg_parse); mpeg_parse->packetize = NULL; mpeg_parse->max_scr_gap = DEFAULT_MAX_SCR_GAP; mpeg_parse->byte_offset = G_MAXUINT64; gst_mpeg_parse_reset (mpeg_parse); templ = gst_element_class_get_pad_template (gstelement_class, "sink"); mpeg_parse->sinkpad = gst_pad_new_from_template (templ, "sink"); gst_element_add_pad (GST_ELEMENT (mpeg_parse), mpeg_parse->sinkpad); if ((templ = gst_element_class_get_pad_template (gstelement_class, "src"))) { mpeg_parse->srcpad = gst_pad_new_from_template (templ, "src"); gst_element_add_pad (GST_ELEMENT (mpeg_parse), mpeg_parse->srcpad); gst_pad_set_event_function (mpeg_parse->srcpad, GST_DEBUG_FUNCPTR (gst_mpeg_parse_handle_src_event)); gst_pad_set_query_type_function (mpeg_parse->srcpad, GST_DEBUG_FUNCPTR (gst_mpeg_parse_get_src_query_types)); gst_pad_set_query_function (mpeg_parse->srcpad, GST_DEBUG_FUNCPTR (gst_mpeg_parse_handle_src_query)); gst_pad_use_fixed_caps (mpeg_parse->srcpad); } gst_pad_set_event_function (mpeg_parse->sinkpad, GST_DEBUG_FUNCPTR (gst_mpeg_parse_event)); gst_pad_set_chain_function (mpeg_parse->sinkpad, GST_DEBUG_FUNCPTR (gst_mpeg_parse_chain)); } #ifdef FIXME static void gst_mpeg_parse_update_streaminfo (GstMPEGParse * mpeg_parse) { GstProps *props; GstPropsEntry *entry; gboolean mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize); GstCaps *caps; props = gst_props_empty_new (); entry = gst_props_entry_new ("mpegversion", G_TYPE_INT (mpeg2 ? 2 : 1)); gst_props_add_entry (props, (GstPropsEntry *) entry); entry = gst_props_entry_new ("bitrate", G_TYPE_INT (mpeg_parse->mux_rate * 8)); gst_props_add_entry (props, (GstPropsEntry *) entry); caps = gst_caps_new ("mpeg_streaminfo", "application/x-gst-streaminfo", props); gst_caps_replace_sink (&mpeg_parse->streaminfo, caps); g_object_notify (G_OBJECT (mpeg_parse), "streaminfo"); } #endif static void gst_mpeg_parse_reset (GstMPEGParse * mpeg_parse) { GST_DEBUG_OBJECT (mpeg_parse, "Resetting mpeg_parse"); mpeg_parse->first_scr = MP_INVALID_SCR; mpeg_parse->first_scr_pos = 0; mpeg_parse->last_scr = MP_INVALID_SCR; mpeg_parse->last_scr_pos = 0; mpeg_parse->scr_rate = 0; mpeg_parse->avg_bitrate_time = 0; mpeg_parse->avg_bitrate_bytes = 0; mpeg_parse->mux_rate = 0; mpeg_parse->current_scr = MP_INVALID_SCR; mpeg_parse->next_scr = 0; mpeg_parse->bytes_since_scr = 0; mpeg_parse->current_ts = 0; mpeg_parse->do_adjust = TRUE; mpeg_parse->adjust = 0; /* Initialize the current segment. */ GST_DEBUG_OBJECT (mpeg_parse, "Resetting current segment"); gst_segment_init (&mpeg_parse->current_segment, GST_FORMAT_TIME); } static GstClockTime gst_mpeg_parse_adjust_ts (GstMPEGParse * mpeg_parse, GstClockTime ts) { if (!GST_CLOCK_TIME_IS_VALID (ts)) { return GST_CLOCK_TIME_NONE; } if (mpeg_parse->do_adjust) { /* Close the SCR gaps. */ return ts + MPEGTIME_TO_GSTTIME (mpeg_parse->adjust); } else { /* Adjust the timestamp in such a way that all segments appear to be in a single continuous sequence starting at time 0. */ if (ts + mpeg_parse->current_segment.accum >= mpeg_parse->current_segment.start) { return ts + mpeg_parse->current_segment.accum - mpeg_parse->current_segment.start; } else { /* The adjustment would lead to a timestamp outside the current segment. Return an invalid timestamp instead. */ return GST_CLOCK_TIME_NONE; } } } static GstFlowReturn gst_mpeg_parse_send_buffer (GstMPEGParse * mpeg_parse, GstBuffer * buffer, GstClockTime time) { GstFlowReturn result = GST_FLOW_OK; if (!gst_caps_is_fixed (GST_PAD_CAPS (mpeg_parse->srcpad))) { gboolean mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize); GstCaps *caps; caps = gst_caps_new_simple ("video/mpeg", "mpegversion", G_TYPE_INT, (mpeg2 ? 2 : 1), "systemstream", G_TYPE_BOOLEAN, TRUE, "parsed", G_TYPE_BOOLEAN, TRUE, NULL); if (!gst_pad_set_caps (mpeg_parse->srcpad, caps)) { GST_ELEMENT_ERROR (GST_ELEMENT (mpeg_parse), CORE, NEGOTIATION, (NULL), ("failed to set caps")); gst_caps_unref (caps); return GST_FLOW_ERROR; } gst_caps_unref (caps); } GST_BUFFER_TIMESTAMP (buffer) = time; GST_DEBUG_OBJECT (mpeg_parse, "current buffer time: %" GST_TIME_FORMAT, GST_TIME_ARGS (time)); result = gst_pad_push (mpeg_parse->srcpad, buffer); return result; } static gboolean gst_mpeg_parse_process_event (GstMPEGParse * mpeg_parse, GstEvent * event) { gboolean ret = FALSE; switch (GST_EVENT_TYPE (event)) { case GST_EVENT_NEWSEGMENT: { gboolean update; gdouble rate; GstFormat format; gint64 start, stop, time; gst_event_parse_new_segment (event, &update, &rate, &format, &start, &stop, &time); if (format == GST_FORMAT_TIME && (GST_CLOCK_TIME_IS_VALID (time))) { /* Update the current segment. */ GST_DEBUG_OBJECT (mpeg_parse, "Updating current segment with newsegment"); gst_segment_set_newsegment (&mpeg_parse->current_segment, update, rate, format, start, stop, time); /* We are receiving segments from upstream. Don't try to adjust SCR values. */ mpeg_parse->do_adjust = FALSE; mpeg_parse->adjust = 0; } mpeg_parse->packetize->resync = TRUE; gst_event_unref (event); ret = TRUE; break; } case GST_EVENT_FLUSH_STOP: /* Forward the event. */ if (CLASS (mpeg_parse)->send_event) { ret = CLASS (mpeg_parse)->send_event (mpeg_parse, event); } else { gst_event_unref (event); } /* Send a newsegment event to restart counting from 0. */ if (CLASS (mpeg_parse)->send_event) { CLASS (mpeg_parse)->send_event (mpeg_parse, gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0)); } /* Reset the internal fields. */ gst_mpeg_parse_reset (mpeg_parse); break; default: if (CLASS (mpeg_parse)->send_event) { ret = CLASS (mpeg_parse)->send_event (mpeg_parse, event); } else { gst_event_unref (event); } break; } return ret; } static gboolean gst_mpeg_parse_send_event (GstMPEGParse * mpeg_parse, GstEvent * event) { GstIterator *it; gpointer pad; gboolean ret = TRUE; /* Send event to all source pads of this element. */ it = gst_element_iterate_src_pads (GST_ELEMENT (mpeg_parse)); while (TRUE) { switch (gst_iterator_next (it, &pad)) { case GST_ITERATOR_OK: gst_event_ref (event); gst_pad_push_event (GST_PAD (pad), event); gst_object_unref (GST_OBJECT (pad)); break; case GST_ITERATOR_RESYNC: gst_iterator_resync (it); break; case GST_ITERATOR_DONE: goto done; case GST_ITERATOR_ERROR: ret = FALSE; goto done; } } done: gst_iterator_free (it); gst_event_unref (event); return ret; } static void gst_mpeg_parse_pad_added (GstElement * element, GstPad * pad) { GstMPEGParse *mpeg_parse; if (GST_PAD_IS_SINK (pad)) { return; } mpeg_parse = GST_MPEG_PARSE (element); /* For each new added pad, send a newsegment event so it knows about * the current time. This is required because MPEG allows any sort * of order of packets, and new substreams can be found at any * time. */ GstEvent *event = gst_event_new_new_segment (FALSE, mpeg_parse->current_segment.rate, GST_FORMAT_TIME, mpeg_parse->current_segment.start, mpeg_parse->current_segment.stop, 0); gst_pad_push_event (pad, event); } static gboolean gst_mpeg_parse_parse_packhead (GstMPEGParse * mpeg_parse, GstBuffer * buffer) { guint8 *buf; guint64 prev_scr, scr, diff; guint32 scr1, scr2; guint32 new_rate; guint64 offset; buf = GST_BUFFER_DATA (buffer); buf += 4; scr1 = GUINT32_FROM_BE (*(guint32 *) buf); scr2 = GUINT32_FROM_BE (*(guint32 *) (buf + 4)); /* Extract the SCR and rate values from the header. */ if (GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize)) { guint32 scr_ext; /* :2=01 ! scr:3 ! marker:1==1 ! scr:15 ! marker:1==1 ! scr:15 */ scr = ((guint64) scr1 & 0x38000000) << 3; scr |= ((guint64) scr1 & 0x03fff800) << 4; scr |= ((guint64) scr1 & 0x000003ff) << 5; scr |= ((guint64) scr2 & 0xf8000000) >> 27; scr_ext = (scr2 & 0x03fe0000) >> 17; scr = (scr * 300 + scr_ext % 300) / 300; GST_LOG_OBJECT (mpeg_parse, "%" G_GINT64_FORMAT " %d, %08x %08x %" G_GINT64_FORMAT " diff: %" G_GINT64_FORMAT, scr, scr_ext, scr1, scr2, mpeg_parse->bytes_since_scr, scr - mpeg_parse->current_scr); buf += 6; new_rate = (GUINT32_FROM_BE ((*(guint32 *) buf)) & 0xfffffc00) >> 10; } else { scr = ((guint64) scr1 & 0x0e000000) << 5; scr |= ((guint64) scr1 & 0x00fffe00) << 6; scr |= ((guint64) scr1 & 0x000000ff) << 7; scr |= ((guint64) scr2 & 0xfe000000) >> 25; buf += 5; /* we do this byte by byte because buf[3] might be outside of buf's * memory space */ new_rate = ((gint32) buf[0] & 0x7f) << 15; new_rate |= ((gint32) buf[1]) << 7; new_rate |= buf[2] >> 1; } new_rate *= MP_MUX_RATE_MULT; prev_scr = mpeg_parse->current_scr; mpeg_parse->current_scr = scr; if (mpeg_parse->next_scr == MP_INVALID_SCR) { mpeg_parse->next_scr = mpeg_parse->current_scr; } /* Update the first SCR. */ if ((mpeg_parse->first_scr == MP_INVALID_SCR) || (mpeg_parse->current_scr < mpeg_parse->first_scr)) { mpeg_parse->first_scr = mpeg_parse->current_scr; mpeg_parse->first_scr_pos = gst_mpeg_packetize_tell (mpeg_parse->packetize); } /* Update the last SCR. */ if ((mpeg_parse->last_scr == MP_INVALID_SCR) || (mpeg_parse->current_scr > mpeg_parse->last_scr)) { mpeg_parse->last_scr = mpeg_parse->current_scr; mpeg_parse->last_scr_pos = gst_mpeg_packetize_tell (mpeg_parse->packetize); } GST_LOG_OBJECT (mpeg_parse, "SCR is %" G_GUINT64_FORMAT " (%" G_GUINT64_FORMAT ") next: %" G_GINT64_FORMAT " (%" G_GINT64_FORMAT ") diff: %" G_GINT64_FORMAT " (%" G_GINT64_FORMAT ")", mpeg_parse->current_scr, MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr), mpeg_parse->next_scr, MPEGTIME_TO_GSTTIME (mpeg_parse->next_scr), mpeg_parse->current_scr - mpeg_parse->next_scr, MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr) - MPEGTIME_TO_GSTTIME (mpeg_parse->next_scr)); /* Watch out for integer overflows... */ if (mpeg_parse->next_scr > scr) { diff = mpeg_parse->next_scr - scr; } else { diff = scr - mpeg_parse->next_scr; } if (mpeg_parse->do_adjust && diff > mpeg_parse->max_scr_gap) { /* SCR gap found, fix the adjust value. */ GST_DEBUG_OBJECT (mpeg_parse, "SCR gap detected; expected: %" G_GUINT64_FORMAT " got: %" G_GUINT64_FORMAT, mpeg_parse->next_scr, mpeg_parse->current_scr); mpeg_parse->adjust += (gint64) mpeg_parse->next_scr - (gint64) mpeg_parse->current_scr; GST_DEBUG_OBJECT (mpeg_parse, "new adjust: %" G_GINT64_FORMAT, mpeg_parse->adjust); } /* Update the current timestamp. */ mpeg_parse->current_ts = CLASS (mpeg_parse)->adjust_ts (mpeg_parse, MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr)); /* Check for the reached offset signal. */ offset = gst_mpeg_packetize_tell (mpeg_parse->packetize); if (offset > mpeg_parse->byte_offset) { /* we have reached the wanted offset so emit the signal. */ g_signal_emit (G_OBJECT (mpeg_parse), gst_mpeg_parse_signals[SIGNAL_REACHED_OFFSET], 0); } /* Update index if any. */ if (mpeg_parse->index && GST_INDEX_IS_WRITABLE (mpeg_parse->index)) { gst_index_add_association (mpeg_parse->index, mpeg_parse->index_id, GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_BYTES, GST_BUFFER_OFFSET (buffer), GST_FORMAT_TIME, MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr), 0); } /* Update the calculated average bitrate. */ if ((mpeg_parse->current_scr > prev_scr) && (diff < mpeg_parse->max_scr_gap)) { mpeg_parse->avg_bitrate_time += MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr - prev_scr); mpeg_parse->avg_bitrate_bytes += mpeg_parse->bytes_since_scr; } /* Update the bitrate. */ if (mpeg_parse->mux_rate != new_rate) { if (GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize)) { mpeg_parse->mux_rate = new_rate; } else if (mpeg_parse->avg_bitrate_bytes > MP_MIN_VALID_BSS) { mpeg_parse->mux_rate = GST_SECOND * mpeg_parse->avg_bitrate_bytes / mpeg_parse->avg_bitrate_time; } //gst_mpeg_parse_update_streaminfo (mpeg_parse); GST_LOG_OBJECT (mpeg_parse, "stream current is %1.3fMbs, calculated over %1.3fkB", (mpeg_parse->mux_rate * 8) / 1048576.0, mpeg_parse->bytes_since_scr / 1024.0); } if (mpeg_parse->avg_bitrate_bytes) { GST_LOG_OBJECT (mpeg_parse, "stream avg is %1.3fMbs, calculated over %1.3fkB", (float) (mpeg_parse->avg_bitrate_bytes) * 8 * GST_SECOND / mpeg_parse->avg_bitrate_time / 1048576.0, mpeg_parse->avg_bitrate_bytes / 1024.0); } /* Range-check the calculated average bitrate. */ if (mpeg_parse->avg_bitrate_bytes > MP_MAX_VALID_BSS) { mpeg_parse->avg_bitrate_bytes = 0; mpeg_parse->avg_bitrate_time = 0; } mpeg_parse->bytes_since_scr = 0; return TRUE; } static gboolean gst_mpeg_parse_event (GstPad * pad, GstEvent * event) { gboolean ret; GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (gst_pad_get_parent (pad)); ret = CLASS (mpeg_parse)->process_event (mpeg_parse, event); gst_object_unref (mpeg_parse); return ret; } static GstFlowReturn gst_mpeg_parse_chain (GstPad * pad, GstBuffer * buffer) { GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (gst_pad_get_parent (pad)); GstFlowReturn result = GST_FLOW_ERROR; guint id; gboolean mpeg2; GstClockTime time; guint64 size; if (!gst_mpeg_packetize_put (mpeg_parse->packetize, buffer)) { gst_buffer_unref (buffer); goto done; } while (1) { result = gst_mpeg_packetize_read (mpeg_parse->packetize, &buffer); if (result == GST_FLOW_RESEND) { /* there was not enough data in packetizer cache */ result = GST_FLOW_OK; goto done; } if (result != GST_FLOW_OK) goto done; id = GST_MPEG_PACKETIZE_ID (mpeg_parse->packetize); mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize); GST_LOG_OBJECT (mpeg_parse, "have chunk 0x%02X", id); switch (id) { case ISO11172_END_START_CODE: break; case PACK_START_CODE: if (CLASS (mpeg_parse)->parse_packhead) { CLASS (mpeg_parse)->parse_packhead (mpeg_parse, buffer); } break; case SYS_HEADER_START_CODE: if (CLASS (mpeg_parse)->parse_syshead) { CLASS (mpeg_parse)->parse_syshead (mpeg_parse, buffer); } break; default: if (mpeg2 && ((id < 0xBD) || (id > 0xFE))) { GST_ELEMENT_WARNING (GST_ELEMENT (mpeg_parse), STREAM, DEMUX, (NULL), ("Unknown stream id 0x%02X", id)); } else { if (mpeg2) { if (CLASS (mpeg_parse)->parse_pes) { result = CLASS (mpeg_parse)->parse_pes (mpeg_parse, buffer); } } else { if (CLASS (mpeg_parse)->parse_packet) { result = CLASS (mpeg_parse)->parse_packet (mpeg_parse, buffer); } } } } /* Don't send data as long as no new SCR is found. */ if (mpeg_parse->current_scr == MP_INVALID_SCR) { GST_DEBUG_OBJECT (mpeg_parse, "waiting for SCR"); gst_buffer_unref (buffer); result = GST_FLOW_OK; goto done; } /* Update the byte count. */ size = GST_BUFFER_SIZE (buffer); mpeg_parse->bytes_since_scr += size; /* Make sure the output pad has proper capabilities. */ if (!GST_PAD_CAPS (mpeg_parse->sinkpad)) { gboolean mpeg2 = GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize); if (!gst_pad_set_caps (mpeg_parse->sinkpad, gst_caps_new_simple ("video/mpeg", "mpegversion", G_TYPE_INT, (mpeg2 ? 2 : 1), "systemstream", G_TYPE_BOOLEAN, TRUE, "parsed", G_TYPE_BOOLEAN, TRUE, NULL)) < 0) { GST_ELEMENT_ERROR (mpeg_parse, CORE, NEGOTIATION, (NULL), (NULL)); gst_buffer_unref (buffer); result = GST_FLOW_ERROR; goto done; } } /* Send the buffer. */ g_return_val_if_fail (mpeg_parse->current_scr != MP_INVALID_SCR, GST_FLOW_OK); time = CLASS (mpeg_parse)->adjust_ts (mpeg_parse, MPEGTIME_TO_GSTTIME (mpeg_parse->current_scr)); if (CLASS (mpeg_parse)->send_buffer) result = CLASS (mpeg_parse)->send_buffer (mpeg_parse, buffer, time); /* Calculate the expected next SCR. */ if (mpeg_parse->current_scr != MP_INVALID_SCR) { guint64 scr, bss, br; scr = mpeg_parse->current_scr; bss = mpeg_parse->bytes_since_scr; if (mpeg_parse->scr_rate != 0) br = mpeg_parse->scr_rate; else br = mpeg_parse->mux_rate; if (br) { if (GST_MPEG_PACKETIZE_IS_MPEG2 (mpeg_parse->packetize)) { /* * The mpeg spec says something like this, but that doesn't * really work: * * mpeg_parse->next_scr = (scr * br + bss * CLOCK_FREQ) / (CLOCK_FREQ + br); */ mpeg_parse->next_scr = scr + (bss * CLOCK_FREQ) / br; } else { /* we are interpolating the scr here */ mpeg_parse->next_scr = scr + (bss * CLOCK_FREQ) / br; } } else { /* no bitrate known */ mpeg_parse->next_scr = scr; } GST_LOG_OBJECT (mpeg_parse, "size: %" G_GINT64_FORMAT ", total since SCR: %" G_GINT64_FORMAT ", br: %" G_GINT64_FORMAT ", next SCR: %" G_GINT64_FORMAT, size, bss, br, mpeg_parse->next_scr); } if (result != GST_FLOW_OK && result != GST_FLOW_NOT_LINKED) { gst_buffer_unref (buffer); goto done; } } done: gst_object_unref (mpeg_parse); if (result == GST_FLOW_NOT_LINKED) result = GST_FLOW_OK; return result; } const GstFormat * gst_mpeg_parse_get_src_formats (GstPad * pad) { static const GstFormat formats[] = { GST_FORMAT_BYTES, GST_FORMAT_TIME, 0 }; return formats; } /* * Return the bitrate to the nearest byte/sec */ static gboolean gst_mpeg_parse_get_rate (GstMPEGParse * mpeg_parse, gint64 * rate) { GstFormat time_format = GST_FORMAT_TIME; GstFormat bytes_format = GST_FORMAT_BYTES; gint64 total_time = 0; gint64 total_bytes = 0; /* If upstream knows the total time and the total bytes, * use those to compute an average byterate */ if (gst_pad_query_duration (GST_PAD_PEER (mpeg_parse->sinkpad), &time_format, &total_time) && gst_pad_query_duration (GST_PAD_PEER (mpeg_parse->sinkpad), &bytes_format, &total_bytes) && total_time != 0 && total_bytes != 0) { /* Use the funny calculation to avoid overflow of 64 bits */ *rate = ((total_bytes * GST_USECOND) / total_time) * (GST_SECOND / GST_USECOND); if (*rate > 0) { return TRUE; } } *rate = 0; if ((mpeg_parse->first_scr != MP_INVALID_SCR) && (mpeg_parse->last_scr != MP_INVALID_SCR) && (mpeg_parse->last_scr_pos - mpeg_parse->first_scr_pos > MP_MIN_VALID_BSS) && (mpeg_parse->last_scr != mpeg_parse->first_scr)) { *rate = GST_SECOND * (mpeg_parse->last_scr_pos - mpeg_parse->first_scr_pos) / MPEGTIME_TO_GSTTIME (mpeg_parse->last_scr - mpeg_parse->first_scr); } if (*rate == 0 && mpeg_parse->avg_bitrate_time != 0 && mpeg_parse->avg_bitrate_bytes > MP_MIN_VALID_BSS) { *rate = GST_SECOND * mpeg_parse->avg_bitrate_bytes / mpeg_parse->avg_bitrate_time; } if (*rate != 0) { /* * check if we need to update scr_rate */ if ((mpeg_parse->scr_rate == 0) || (((double) (ABS (mpeg_parse->scr_rate - *rate)) / mpeg_parse->scr_rate) >= MP_SCR_RATE_HYST)) { mpeg_parse->scr_rate = *rate; return TRUE; } } if (mpeg_parse->scr_rate != 0) { *rate = mpeg_parse->scr_rate; return TRUE; } if (mpeg_parse->mux_rate != 0) { *rate = mpeg_parse->mux_rate; return TRUE; } return FALSE; } static gboolean gst_mpeg_parse_convert (GstMPEGParse * mpeg_parse, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value) { gboolean res = TRUE; gint64 rate; if (src_format == *dest_format) { *dest_value = src_value; return TRUE; } switch (src_format) { case GST_FORMAT_BYTES: switch (*dest_format) { case GST_FORMAT_DEFAULT: *dest_format = GST_FORMAT_TIME; case GST_FORMAT_TIME: if (!gst_mpeg_parse_get_rate (mpeg_parse, &rate)) { res = FALSE; } else { *dest_value = GST_SECOND * src_value / rate; } break; default: res = FALSE; break; } break; case GST_FORMAT_TIME: switch (*dest_format) { case GST_FORMAT_DEFAULT: *dest_format = GST_FORMAT_BYTES; case GST_FORMAT_BYTES: if (!gst_mpeg_parse_get_rate (mpeg_parse, &rate)) { res = FALSE; } else { *dest_value = src_value * rate / GST_SECOND; } break; case GST_FORMAT_TIME: break; default: res = FALSE; break; } break; default: res = FALSE; break; } return res; } const GstQueryType * gst_mpeg_parse_get_src_query_types (GstPad * pad) { static const GstQueryType types[] = { GST_QUERY_DURATION, GST_QUERY_POSITION, GST_QUERY_CONVERT, 0 }; return types; } gboolean gst_mpeg_parse_handle_src_query (GstPad * pad, GstQuery * query) { gboolean res = TRUE; GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (GST_PAD_PARENT (pad)); GstFormat src_format = GST_FORMAT_UNDEFINED, format; gint64 src_value = 0, value; switch (GST_QUERY_TYPE (query)) { case GST_QUERY_DURATION: { gst_query_parse_duration (query, &format, NULL); switch (format) { case GST_FORMAT_DEFAULT: format = GST_FORMAT_TIME; /* fallthrough */ case GST_FORMAT_TIME: /* Try asking upstream if it knows the time - a DVD might know */ src_format = GST_FORMAT_TIME; if (gst_pad_query_duration (GST_PAD_PEER (mpeg_parse->sinkpad), &src_format, &src_value)) { res = TRUE; break; } /* Otherwise fallthrough */ default: src_format = GST_FORMAT_BYTES; if (!gst_pad_query_duration (GST_PAD_PEER (mpeg_parse->sinkpad), &src_format, &src_value)) { res = FALSE; goto done; } break; } /* Convert the value to the desired format. */ if (!gst_mpeg_parse_convert (mpeg_parse, src_format, src_value, &format, &value)) { res = FALSE; goto done; } gst_query_set_duration (query, format, value); break; } case GST_QUERY_POSITION: { gst_query_parse_position (query, &format, NULL); switch (format) { case GST_FORMAT_DEFAULT: format = GST_FORMAT_TIME; /* Fallthrough. */ default: src_format = GST_FORMAT_TIME; if ((mpeg_parse->current_scr == MP_INVALID_SCR) || (mpeg_parse->first_scr == MP_INVALID_SCR)) { res = FALSE; goto done; } gint64 cur = (gint64) (mpeg_parse->current_scr) - mpeg_parse->first_scr; src_value = MPEGTIME_TO_GSTTIME (MAX (0, cur)); break; } /* Convert the value to the desired format. */ if (!gst_mpeg_parse_convert (mpeg_parse, src_format, src_value, &format, &value)) { res = FALSE; goto done; } gst_query_set_position (query, format, value); break; } case GST_QUERY_CONVERT: { gst_query_parse_convert (query, &src_format, &src_value, &format, NULL); if (!gst_mpeg_parse_convert (mpeg_parse, src_format, src_value, &format, &value)) { res = FALSE; goto done; } gst_query_set_convert (query, src_format, src_value, format, value); break; } default: res = FALSE; goto done; } done: return res; } #ifdef FIXME static gboolean index_seek (GstPad * pad, GstEvent * event, gint64 * offset, gint64 * scr) { GstIndexEntry *entry; GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (gst_pad_get_parent (pad)); entry = gst_index_get_assoc_entry (mpeg_parse->index, mpeg_parse->index_id, GST_INDEX_LOOKUP_BEFORE, 0, GST_EVENT_SEEK_FORMAT (event), GST_EVENT_SEEK_OFFSET (event)); if (!entry) return FALSE; if (gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, offset)) { gint64 time; if (gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &time)) { *scr = GSTTIME_TO_MPEGTIME (time); } GST_CAT_DEBUG (GST_CAT_SEEK, "%s:%s index %s %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT " bytes, scr=%" G_GINT64_FORMAT, GST_DEBUG_PAD_NAME (pad), gst_format_get_details (GST_EVENT_SEEK_FORMAT (event))->nick, GST_EVENT_SEEK_OFFSET (event), *offset, *scr); return TRUE; } return FALSE; } #endif static GstEvent * normal_seek (GstMPEGParse * mpeg_parse, GstPad * pad, GstEvent * event) { GstEvent *upstream = NULL; gint64 offset; GstFormat format, conv; gint64 cur, stop; gdouble rate; GstSeekType cur_type, stop_type; GstSeekFlags flags; gint64 start_position, end_position; gst_event_parse_seek (event, &rate, &format, &flags, &cur_type, &cur, &stop_type, &stop); offset = cur; if (offset != -1) { GST_LOG_OBJECT (mpeg_parse, "starting conversion of cur"); /* Bring the format to time on srcpad. */ conv = GST_FORMAT_TIME; if (!gst_pad_query_convert (pad, format, offset, &conv, &start_position)) { goto done; } /* And convert to bytes on sinkpad. */ conv = GST_FORMAT_BYTES; if (!gst_pad_query_convert (mpeg_parse->sinkpad, GST_FORMAT_TIME, start_position, &conv, &start_position)) { goto done; } GST_INFO_OBJECT (mpeg_parse, "Finished conversion of cur, BYTES cur : %lld", start_position); } else { start_position = -1; } offset = stop; if (offset != -1) { GST_INFO_OBJECT (mpeg_parse, "starting conversion of stop"); /* Bring the format to time on srcpad. */ conv = GST_FORMAT_TIME; if (!gst_pad_query_convert (pad, format, offset, &conv, &end_position)) { goto done; } /* And convert to bytes on sinkpad. */ conv = GST_FORMAT_BYTES; if (!gst_pad_query_convert (mpeg_parse->sinkpad, GST_FORMAT_TIME, end_position, &conv, &end_position)) { goto done; } GST_INFO_OBJECT (mpeg_parse, "Finished conversion of stop, BYTES stop : %lld", end_position); } else { end_position = -1; } upstream = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags, cur_type, start_position, stop_type, end_position); done: return upstream; } gboolean gst_mpeg_parse_handle_src_event (GstPad * pad, GstEvent * event) { gboolean res = TRUE; GstEvent *upstream = NULL; GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (gst_pad_get_parent (pad)); GST_INFO_OBJECT (mpeg_parse, "Event received"); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_SEEK: { GST_INFO_OBJECT (mpeg_parse, "Seek event received"); #ifdef FIXME /* First try to use the index if we have one. */ if (mpeg_parse->index) { res = index_seek (pad, event, &desired_offset, &expected_scr); } #endif if (upstream == NULL) { /* Nothing found, try fuzzy seek. */ upstream = normal_seek (mpeg_parse, pad, event); } if (!upstream) { res = FALSE; goto done; } gst_pad_push_event (pad, upstream); break; } case GST_EVENT_NAVIGATION: /* Forward navigation events unchanged. */ res = gst_pad_push_event (mpeg_parse->sinkpad, event); break; default: res = FALSE; break; } done: gst_object_unref (mpeg_parse); gst_event_unref (event); return res; } static GstStateChangeReturn gst_mpeg_parse_change_state (GstElement * element, GstStateChange transition) { GstMPEGParse *mpeg_parse = GST_MPEG_PARSE (element); GstStateChangeReturn result = GST_STATE_CHANGE_FAILURE; switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: if (!mpeg_parse->packetize) { mpeg_parse->packetize = gst_mpeg_packetize_new (mpeg_parse->srcpad, GST_MPEG_PACKETIZE_SYSTEM); } /* Initialize parser state */ gst_mpeg_parse_reset (mpeg_parse); /* Send a newsegment event to start counting from 0. */ if (CLASS (mpeg_parse)->send_event) { CLASS (mpeg_parse)->send_event (mpeg_parse, gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0, -1, 0)); } break; default: break; } result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: if (mpeg_parse->packetize) { gst_mpeg_packetize_destroy (mpeg_parse->packetize); mpeg_parse->packetize = NULL; } //gst_caps_replace (&mpeg_parse->streaminfo, NULL); break; default: break; } return result; } static void gst_mpeg_parse_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstMPEGParse *mpeg_parse; mpeg_parse = GST_MPEG_PARSE (object); switch (prop_id) { case ARG_MAX_SCR_GAP: g_value_set_int (value, mpeg_parse->max_scr_gap); break; case ARG_BYTE_OFFSET: g_value_set_uint64 (value, mpeg_parse->byte_offset); break; case ARG_TIME_OFFSET: g_value_set_uint64 (value, mpeg_parse->current_ts); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_mpeg_parse_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstMPEGParse *mpeg_parse; mpeg_parse = GST_MPEG_PARSE (object); switch (prop_id) { case ARG_MAX_SCR_GAP: mpeg_parse->max_scr_gap = g_value_get_int (value); break; case ARG_BYTE_OFFSET: mpeg_parse->byte_offset = g_value_get_uint64 (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_mpeg_parse_set_index (GstElement * element, GstIndex * index) { GstMPEGParse *mpeg_parse; mpeg_parse = GST_MPEG_PARSE (element); mpeg_parse->index = index; gst_index_get_writer_id (index, GST_OBJECT (mpeg_parse->sinkpad), &mpeg_parse->index_id); gst_index_add_format (index, mpeg_parse->index_id, scr_format); } static GstIndex * gst_mpeg_parse_get_index (GstElement * element) { GstMPEGParse *mpeg_parse; mpeg_parse = GST_MPEG_PARSE (element); return mpeg_parse->index; } gboolean gst_mpeg_parse_plugin_init (GstPlugin * plugin) { scr_format = gst_format_register ("scr", "The MPEG system clock reference time"); return gst_element_register (plugin, "mpegparse", GST_RANK_NONE, GST_TYPE_MPEG_PARSE); }