/* GStreamer * Copyright (C) <2005> Wim Taymans * * 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 */ /** * SECTION:gstbasertppayload * @short_description: Base class for RTP payloader * * * * Provides a base class for RTP payloaders * * */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include "gstbasertppayload.h" GST_DEBUG_CATEGORY_STATIC (basertppayload_debug); #define GST_CAT_DEFAULT (basertppayload_debug) #define GST_BASE_RTP_PAYLOAD_GET_PRIVATE(obj) \ (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_RTP_PAYLOAD, GstBaseRTPPayloadPrivate)) struct _GstBaseRTPPayloadPrivate { gboolean ts_offset_random; gboolean seqnum_offset_random; gboolean ssrc_random; guint16 next_seqnum; gboolean perfect_rtptime; gint64 prop_max_ptime; gint64 caps_max_ptime; }; /* BaseRTPPayload signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; /* FIXME 0.11, a better default is the Ethernet MTU of * 1500 - sizeof(headers) as pointed out by marcelm in IRC: * So an Ethernet MTU of 1500, minus 60 for the max IP, minus 8 for UDP, gives * 1432 bytes or so. And that should be adjusted downward further for other * encapsulations like PPPoE, so 1400 at most. */ #define DEFAULT_MTU 1400 #define DEFAULT_PT 96 #define DEFAULT_SSRC -1 #define DEFAULT_TIMESTAMP_OFFSET -1 #define DEFAULT_SEQNUM_OFFSET -1 #define DEFAULT_MAX_PTIME -1 #define DEFAULT_MIN_PTIME 0 #define DEFAULT_PERFECT_RTPTIME TRUE enum { PROP_0, PROP_MTU, PROP_PT, PROP_SSRC, PROP_TIMESTAMP_OFFSET, PROP_SEQNUM_OFFSET, PROP_MAX_PTIME, PROP_MIN_PTIME, PROP_TIMESTAMP, PROP_SEQNUM, PROP_PERFECT_RTPTIME, PROP_LAST }; static void gst_basertppayload_class_init (GstBaseRTPPayloadClass * klass); static void gst_basertppayload_base_init (GstBaseRTPPayloadClass * klass); static void gst_basertppayload_init (GstBaseRTPPayload * basertppayload, gpointer g_class); static void gst_basertppayload_finalize (GObject * object); static gboolean gst_basertppayload_sink_setcaps (GstPad * pad, GstCaps * caps); static GstCaps *gst_basertppayload_sink_getcaps (GstPad * pad); static gboolean gst_basertppayload_event (GstPad * pad, GstEvent * event); static GstFlowReturn gst_basertppayload_chain (GstPad * pad, GstBuffer * buffer); static void gst_basertppayload_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_basertppayload_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static GstStateChangeReturn gst_basertppayload_change_state (GstElement * element, GstStateChange transition); static GstElementClass *parent_class = NULL; /* FIXME 0.11: API should be changed to gst_base_typ_payload_xyz */ GType gst_basertppayload_get_type (void) { static GType basertppayload_type = 0; if (!basertppayload_type) { static const GTypeInfo basertppayload_info = { sizeof (GstBaseRTPPayloadClass), (GBaseInitFunc) gst_basertppayload_base_init, NULL, (GClassInitFunc) gst_basertppayload_class_init, NULL, NULL, sizeof (GstBaseRTPPayload), 0, (GInstanceInitFunc) gst_basertppayload_init, }; basertppayload_type = g_type_register_static (GST_TYPE_ELEMENT, "GstBaseRTPPayload", &basertppayload_info, G_TYPE_FLAG_ABSTRACT); } return basertppayload_type; } static void gst_basertppayload_base_init (GstBaseRTPPayloadClass * klass) { } static void gst_basertppayload_class_init (GstBaseRTPPayloadClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; g_type_class_add_private (klass, sizeof (GstBaseRTPPayloadPrivate)); parent_class = g_type_class_peek_parent (klass); gobject_class->finalize = gst_basertppayload_finalize; gobject_class->set_property = gst_basertppayload_set_property; gobject_class->get_property = gst_basertppayload_get_property; g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MTU, g_param_spec_uint ("mtu", "MTU", "Maximum size of one packet", 28, G_MAXUINT, DEFAULT_MTU, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_PT, g_param_spec_uint ("pt", "payload type", "The payload type of the packets", 0, 0x80, DEFAULT_PT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SSRC, g_param_spec_uint ("ssrc", "SSRC", "The SSRC of the packets (default == random)", 0, G_MAXUINT32, DEFAULT_SSRC, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TIMESTAMP_OFFSET, g_param_spec_uint ("timestamp-offset", "Timestamp Offset", "Offset to add to all outgoing timestamps (default = random)", 0, G_MAXUINT32, DEFAULT_TIMESTAMP_OFFSET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM_OFFSET, g_param_spec_int ("seqnum-offset", "Sequence number Offset", "Offset to add to all outgoing seqnum (-1 = random)", -1, G_MAXUINT16, DEFAULT_SEQNUM_OFFSET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MAX_PTIME, g_param_spec_int64 ("max-ptime", "Max packet time", "Maximum duration of the packet data in ns (-1 = unlimited up to MTU)", -1, G_MAXINT64, DEFAULT_MAX_PTIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstBaseRTPAudioPayload:min-ptime: * * Minimum duration of the packet data in ns (can't go above MTU) * * Since: 0.10.13 **/ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MIN_PTIME, g_param_spec_int64 ("min-ptime", "Min packet time", "Minimum duration of the packet data in ns (can't go above MTU)", 0, G_MAXINT64, DEFAULT_MIN_PTIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TIMESTAMP, g_param_spec_uint ("timestamp", "Timestamp", "The RTP timestamp of the last processed packet", 0, G_MAXUINT32, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM, g_param_spec_uint ("seqnum", "Sequence number", "The RTP sequence number of the last processed packet", 0, G_MAXUINT16, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); /** * GstBaseRTPAudioPayload:perfect-rtptime: * * Try to use the offset fields to generate perfect RTP timestamps. when this * option is disabled, RTP timestamps are generated from the GStreamer * timestamps, which could result in RTP timestamps that don't increment with * the amount of data in the packet. * * Since: 0.10.25 */ g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_PERFECT_RTPTIME, g_param_spec_boolean ("perfect-rtptime", "Perfect RTP Time", "Generate perfect RTP timestamps when possible", DEFAULT_PERFECT_RTPTIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstelement_class->change_state = gst_basertppayload_change_state; GST_DEBUG_CATEGORY_INIT (basertppayload_debug, "basertppayload", 0, "Base class for RTP Payloaders"); } static void gst_basertppayload_init (GstBaseRTPPayload * basertppayload, gpointer g_class) { GstPadTemplate *templ; GstBaseRTPPayloadPrivate *priv; basertppayload->priv = priv = GST_BASE_RTP_PAYLOAD_GET_PRIVATE (basertppayload); templ = gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "src"); g_return_if_fail (templ != NULL); basertppayload->srcpad = gst_pad_new_from_template (templ, "src"); gst_element_add_pad (GST_ELEMENT (basertppayload), basertppayload->srcpad); templ = gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "sink"); g_return_if_fail (templ != NULL); basertppayload->sinkpad = gst_pad_new_from_template (templ, "sink"); gst_pad_set_setcaps_function (basertppayload->sinkpad, gst_basertppayload_sink_setcaps); gst_pad_set_getcaps_function (basertppayload->sinkpad, gst_basertppayload_sink_getcaps); gst_pad_set_event_function (basertppayload->sinkpad, gst_basertppayload_event); gst_pad_set_chain_function (basertppayload->sinkpad, gst_basertppayload_chain); gst_element_add_pad (GST_ELEMENT (basertppayload), basertppayload->sinkpad); basertppayload->seq_rand = g_rand_new_with_seed (g_random_int ()); basertppayload->ssrc_rand = g_rand_new_with_seed (g_random_int ()); basertppayload->ts_rand = g_rand_new_with_seed (g_random_int ()); basertppayload->mtu = DEFAULT_MTU; basertppayload->pt = DEFAULT_PT; basertppayload->seqnum_offset = DEFAULT_SEQNUM_OFFSET; basertppayload->ssrc = DEFAULT_SSRC; basertppayload->ts_offset = DEFAULT_TIMESTAMP_OFFSET; priv->seqnum_offset_random = (basertppayload->seqnum_offset == -1); priv->ts_offset_random = (basertppayload->ts_offset == -1); priv->ssrc_random = (basertppayload->ssrc == -1); basertppayload->max_ptime = DEFAULT_MAX_PTIME; basertppayload->min_ptime = DEFAULT_MIN_PTIME; basertppayload->priv->perfect_rtptime = DEFAULT_PERFECT_RTPTIME; basertppayload->media = NULL; basertppayload->encoding_name = NULL; basertppayload->clock_rate = 0; basertppayload->priv->caps_max_ptime = DEFAULT_MAX_PTIME; basertppayload->priv->prop_max_ptime = DEFAULT_MAX_PTIME; } static void gst_basertppayload_finalize (GObject * object) { GstBaseRTPPayload *basertppayload; basertppayload = GST_BASE_RTP_PAYLOAD (object); g_rand_free (basertppayload->seq_rand); basertppayload->seq_rand = NULL; g_rand_free (basertppayload->ssrc_rand); basertppayload->ssrc_rand = NULL; g_rand_free (basertppayload->ts_rand); basertppayload->ts_rand = NULL; g_free (basertppayload->media); basertppayload->media = NULL; g_free (basertppayload->encoding_name); basertppayload->encoding_name = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } static gboolean gst_basertppayload_sink_setcaps (GstPad * pad, GstCaps * caps) { GstBaseRTPPayload *basertppayload; GstBaseRTPPayloadClass *basertppayload_class; gboolean ret = TRUE; GST_DEBUG_OBJECT (pad, "setting caps %" GST_PTR_FORMAT, caps); basertppayload = GST_BASE_RTP_PAYLOAD (gst_pad_get_parent (pad)); basertppayload_class = GST_BASE_RTP_PAYLOAD_GET_CLASS (basertppayload); if (basertppayload_class->set_caps) ret = basertppayload_class->set_caps (basertppayload, caps); gst_object_unref (basertppayload); return ret; } static GstCaps * gst_basertppayload_sink_getcaps (GstPad * pad) { GstBaseRTPPayload *basertppayload; GstBaseRTPPayloadClass *basertppayload_class; GstCaps *caps = NULL; GST_DEBUG_OBJECT (pad, "getting caps"); basertppayload = GST_BASE_RTP_PAYLOAD (gst_pad_get_parent (pad)); basertppayload_class = GST_BASE_RTP_PAYLOAD_GET_CLASS (basertppayload); if (basertppayload_class->get_caps) caps = basertppayload_class->get_caps (basertppayload, pad); if (!caps) { caps = GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (pad)); GST_DEBUG_OBJECT (pad, "using pad template %p with caps %p %" GST_PTR_FORMAT, GST_PAD_PAD_TEMPLATE (pad), caps, caps); caps = gst_caps_ref (caps); } gst_object_unref (basertppayload); return caps; } static gboolean gst_basertppayload_event (GstPad * pad, GstEvent * event) { GstBaseRTPPayload *basertppayload; GstBaseRTPPayloadClass *basertppayload_class; gboolean res; basertppayload = GST_BASE_RTP_PAYLOAD (gst_pad_get_parent (pad)); basertppayload_class = GST_BASE_RTP_PAYLOAD_GET_CLASS (basertppayload); if (basertppayload_class->handle_event) { res = basertppayload_class->handle_event (pad, event); if (res) goto done; } switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_START: res = gst_pad_event_default (pad, event); break; case GST_EVENT_FLUSH_STOP: res = gst_pad_event_default (pad, event); gst_segment_init (&basertppayload->segment, GST_FORMAT_UNDEFINED); break; case GST_EVENT_NEWSEGMENT: { gboolean update; gdouble rate; GstFormat fmt; gint64 start, stop, position; gst_event_parse_new_segment (event, &update, &rate, &fmt, &start, &stop, &position); gst_segment_set_newsegment (&basertppayload->segment, update, rate, fmt, start, stop, position); /* fallthrough */ } default: res = gst_pad_event_default (pad, event); break; } done: gst_object_unref (basertppayload); return res; } static GstFlowReturn gst_basertppayload_chain (GstPad * pad, GstBuffer * buffer) { GstBaseRTPPayload *basertppayload; GstBaseRTPPayloadClass *basertppayload_class; GstFlowReturn ret; basertppayload = GST_BASE_RTP_PAYLOAD (gst_pad_get_parent (pad)); basertppayload_class = GST_BASE_RTP_PAYLOAD_GET_CLASS (basertppayload); if (!basertppayload_class->handle_buffer) goto no_function; ret = basertppayload_class->handle_buffer (basertppayload, buffer); gst_object_unref (basertppayload); return ret; /* ERRORS */ no_function: { GST_ELEMENT_ERROR (basertppayload, STREAM, NOT_IMPLEMENTED, (NULL), ("subclass did not implement handle_buffer function")); gst_object_unref (basertppayload); gst_buffer_unref (buffer); return GST_FLOW_ERROR; } } /** * gst_basertppayload_set_options: * @payload: a #GstBaseRTPPayload * @media: the media type (typically "audio" or "video") * @dynamic: if the payload type is dynamic * @encoding_name: the encoding name * @clock_rate: the clock rate of the media * * Set the rtp options of the payloader. These options will be set in the caps * of the payloader. Subclasses must call this method before calling * gst_basertppayload_push() or gst_basertppayload_set_outcaps(). */ void gst_basertppayload_set_options (GstBaseRTPPayload * payload, gchar * media, gboolean dynamic, gchar * encoding_name, guint32 clock_rate) { g_return_if_fail (payload != NULL); g_return_if_fail (clock_rate != 0); g_free (payload->media); payload->media = g_strdup (media); payload->dynamic = dynamic; g_free (payload->encoding_name); payload->encoding_name = g_strdup (encoding_name); payload->clock_rate = clock_rate; } static gboolean copy_fixed (GQuark field_id, const GValue * value, GstStructure * dest) { if (gst_value_is_fixed (value)) { gst_structure_id_set_value (dest, field_id, value); } return TRUE; } static void update_max_ptime (GstBaseRTPPayload * basertppayload) { if (basertppayload->priv->caps_max_ptime != -1 && basertppayload->priv->prop_max_ptime != -1) basertppayload->max_ptime = MIN (basertppayload->priv->caps_max_ptime, basertppayload->priv->prop_max_ptime); else if (basertppayload->priv->caps_max_ptime != -1) basertppayload->max_ptime = basertppayload->priv->caps_max_ptime; else if (basertppayload->priv->prop_max_ptime != -1) basertppayload->max_ptime = basertppayload->priv->prop_max_ptime; else basertppayload->max_ptime = DEFAULT_MAX_PTIME; } /** * gst_basertppayload_set_outcaps: * @payload: a #GstBaseRTPPayload * @fieldname: the first field name or %NULL * @...: field values * * Configure the output caps with the optional parameters. * * Variable arguments should be in the form field name, field type * (as a GType), value(s). The last variable argument should be NULL. * * Returns: %TRUE if the caps could be set. */ gboolean gst_basertppayload_set_outcaps (GstBaseRTPPayload * payload, gchar * fieldname, ...) { GstCaps *srccaps, *peercaps; gboolean res; /* fill in the defaults, their properties cannot be negotiated. */ srccaps = gst_caps_new_simple ("application/x-rtp", "media", G_TYPE_STRING, payload->media, "clock-rate", G_TYPE_INT, payload->clock_rate, "encoding-name", G_TYPE_STRING, payload->encoding_name, NULL); GST_DEBUG_OBJECT (payload, "defaults: %" GST_PTR_FORMAT, srccaps); if (fieldname) { va_list varargs; /* override with custom properties */ va_start (varargs, fieldname); gst_caps_set_simple_valist (srccaps, fieldname, varargs); va_end (varargs); GST_DEBUG_OBJECT (payload, "custom added: %" GST_PTR_FORMAT, srccaps); } payload->priv->caps_max_ptime = DEFAULT_MAX_PTIME; payload->abidata.ABI.ptime = 0; /* the peer caps can override some of the defaults */ peercaps = gst_pad_peer_get_caps (payload->srcpad); if (peercaps == NULL) { /* no peer caps, just add the other properties */ gst_caps_set_simple (srccaps, "payload", G_TYPE_INT, GST_BASE_RTP_PAYLOAD_PT (payload), "ssrc", G_TYPE_UINT, payload->current_ssrc, "clock-base", G_TYPE_UINT, payload->ts_base, "seqnum-base", G_TYPE_UINT, payload->seqnum_base, NULL); GST_DEBUG_OBJECT (payload, "no peer caps: %" GST_PTR_FORMAT, srccaps); } else { GstCaps *temp; GstStructure *s, *d; const GValue *value; gint pt; gint max_ptime, ptime; /* peer provides caps we can use to fixate, intersect. This always returns a * writable caps. */ temp = gst_caps_intersect (srccaps, peercaps); gst_caps_unref (srccaps); gst_caps_unref (peercaps); /* now fixate, start by taking the first caps */ gst_caps_truncate (temp); /* get first structure */ s = gst_caps_get_structure (temp, 0); if (gst_structure_get_int (s, "maxptime", &max_ptime) && max_ptime > 0) payload->priv->caps_max_ptime = max_ptime * GST_MSECOND; if (gst_structure_get_int (s, "ptime", &ptime) && ptime > 0) payload->abidata.ABI.ptime = ptime; if (gst_structure_get_int (s, "payload", &pt)) { /* use peer pt */ GST_BASE_RTP_PAYLOAD_PT (payload) = pt; GST_LOG_OBJECT (payload, "using peer pt %d", pt); } else { if (gst_structure_has_field (s, "payload")) { /* can only fixate if there is a field */ gst_structure_fixate_field_nearest_int (s, "payload", GST_BASE_RTP_PAYLOAD_PT (payload)); gst_structure_get_int (s, "payload", &pt); GST_LOG_OBJECT (payload, "using peer pt %d", pt); } else { /* no pt field, use the internal pt */ pt = GST_BASE_RTP_PAYLOAD_PT (payload); gst_structure_set (s, "payload", G_TYPE_INT, pt, NULL); GST_LOG_OBJECT (payload, "using internal pt %d", pt); } } if (gst_structure_has_field_typed (s, "ssrc", G_TYPE_UINT)) { value = gst_structure_get_value (s, "ssrc"); payload->current_ssrc = g_value_get_uint (value); GST_LOG_OBJECT (payload, "using peer ssrc %08x", payload->current_ssrc); } else { /* FIXME, fixate_nearest_uint would be even better */ gst_structure_set (s, "ssrc", G_TYPE_UINT, payload->current_ssrc, NULL); GST_LOG_OBJECT (payload, "using internal ssrc %08x", payload->current_ssrc); } if (gst_structure_has_field_typed (s, "clock-base", G_TYPE_UINT)) { value = gst_structure_get_value (s, "clock-base"); payload->ts_base = g_value_get_uint (value); GST_LOG_OBJECT (payload, "using peer clock-base %u", payload->ts_base); } else { /* FIXME, fixate_nearest_uint would be even better */ gst_structure_set (s, "clock-base", G_TYPE_UINT, payload->ts_base, NULL); GST_LOG_OBJECT (payload, "using internal clock-base %u", payload->ts_base); } if (gst_structure_has_field_typed (s, "seqnum-base", G_TYPE_UINT)) { value = gst_structure_get_value (s, "seqnum-base"); payload->seqnum_base = g_value_get_uint (value); GST_LOG_OBJECT (payload, "using peer seqnum-base %u", payload->seqnum_base); } else { /* FIXME, fixate_nearest_uint would be even better */ gst_structure_set (s, "seqnum-base", G_TYPE_UINT, payload->seqnum_base, NULL); GST_LOG_OBJECT (payload, "using internal seqnum-base %u", payload->seqnum_base); } /* make the target caps by copying over all the fixed caps, removing the * unfixed caps. */ srccaps = gst_caps_new_simple (gst_structure_get_name (s), NULL); d = gst_caps_get_structure (srccaps, 0); gst_structure_foreach (s, (GstStructureForeachFunc) copy_fixed, d); gst_caps_unref (temp); GST_DEBUG_OBJECT (payload, "with peer caps: %" GST_PTR_FORMAT, srccaps); } update_max_ptime (payload); res = gst_pad_set_caps (GST_BASE_RTP_PAYLOAD_SRCPAD (payload), srccaps); gst_caps_unref (srccaps); return res; } /** * gst_basertppayload_is_filled: * @payload: a #GstBaseRTPPayload * @size: the size of the packet * @duration: the duration of the packet * * Check if the packet with @size and @duration would exceed the configured * maximum size. * * Returns: %TRUE if the packet of @size and @duration would exceed the * configured MTU or max_ptime. */ gboolean gst_basertppayload_is_filled (GstBaseRTPPayload * payload, guint size, GstClockTime duration) { if (size > payload->mtu) return TRUE; if (payload->max_ptime != -1 && duration >= payload->max_ptime) return TRUE; return FALSE; } typedef struct { GstBaseRTPPayload *payload; guint32 ssrc; guint16 seqnum; guint8 pt; GstCaps *caps; GstClockTime timestamp; guint64 offset; guint32 rtptime; } HeaderData; static GstBufferListItem find_timestamp (GstBuffer ** buffer, guint group, guint idx, HeaderData * data) { data->timestamp = GST_BUFFER_TIMESTAMP (*buffer); data->offset = GST_BUFFER_OFFSET (*buffer); /* stop when we find a timestamp. We take whatever offset is associated with * the timestamp (if any) to do perfect timestamps when we need to. */ if (data->timestamp != -1) return GST_BUFFER_LIST_END; else return GST_BUFFER_LIST_CONTINUE; } static GstBufferListItem set_headers (GstBuffer ** buffer, guint group, guint idx, HeaderData * data) { gst_rtp_buffer_set_ssrc (*buffer, data->ssrc); gst_rtp_buffer_set_payload_type (*buffer, data->pt); gst_rtp_buffer_set_seq (*buffer, data->seqnum); gst_rtp_buffer_set_timestamp (*buffer, data->rtptime); gst_buffer_set_caps (*buffer, data->caps); /* increment the seqnum for each buffer */ data->seqnum++; return GST_BUFFER_LIST_SKIP_GROUP; } /* Updates the SSRC, payload type, seqnum and timestamp of the RTP buffer * before the buffer is pushed. */ static GstFlowReturn gst_basertppayload_prepare_push (GstBaseRTPPayload * payload, gpointer obj, gboolean is_list) { GstBaseRTPPayloadPrivate *priv; HeaderData data; if (payload->clock_rate == 0) goto no_rate; priv = payload->priv; /* update first, so that the property is set to the last * seqnum pushed */ payload->seqnum = priv->next_seqnum; /* fill in the fields we want to set on all headers */ data.payload = payload; data.seqnum = payload->seqnum; data.ssrc = payload->current_ssrc; data.pt = payload->pt; data.caps = GST_PAD_CAPS (payload->srcpad); /* find the first buffer with a timestamp */ if (is_list) { data.timestamp = -1; data.offset = GST_BUFFER_OFFSET_NONE; gst_buffer_list_foreach (GST_BUFFER_LIST_CAST (obj), (GstBufferListFunc) find_timestamp, &data); } else { data.timestamp = GST_BUFFER_TIMESTAMP (GST_BUFFER_CAST (obj)); data.offset = GST_BUFFER_OFFSET (GST_BUFFER_CAST (obj)); } /* convert to RTP time */ if (priv->perfect_rtptime && data.offset != GST_BUFFER_OFFSET_NONE) { /* if we have an offset, use that for making an RTP timestamp */ data.rtptime = payload->ts_base + data.offset; GST_LOG_OBJECT (payload, "Using offset %" G_GUINT64_FORMAT " for RTP timestamp", data.offset); } else if (GST_CLOCK_TIME_IS_VALID (data.timestamp)) { gint64 rtime; /* no offset, use the gstreamer timestamp */ rtime = gst_segment_to_running_time (&payload->segment, GST_FORMAT_TIME, data.timestamp); GST_LOG_OBJECT (payload, "Using running_time %" GST_TIME_FORMAT " for RTP timestamp", GST_TIME_ARGS (rtime)); rtime = gst_util_uint64_scale_int (rtime, payload->clock_rate, GST_SECOND); /* add running_time in clock-rate units to the base timestamp */ data.rtptime = payload->ts_base + rtime; } else { GST_LOG_OBJECT (payload, "Using previous RTP timestamp %" G_GUINT32_FORMAT, payload->timestamp); /* no timestamp to convert, take previous timestamp */ data.rtptime = payload->timestamp; } /* set ssrc, payload type, seq number, caps and rtptime */ if (is_list) { gst_buffer_list_foreach (GST_BUFFER_LIST_CAST (obj), (GstBufferListFunc) set_headers, &data); } else { GstBuffer *buf = GST_BUFFER_CAST (obj); set_headers (&buf, 0, 0, &data); } priv->next_seqnum = data.seqnum; payload->timestamp = data.rtptime; GST_LOG_OBJECT (payload, "Preparing to push packet with size %d, seq=%d, rtptime=%u, timestamp %" GST_TIME_FORMAT, (is_list) ? -1 : GST_BUFFER_SIZE (GST_BUFFER (obj)), payload->seqnum, data.rtptime, GST_TIME_ARGS (data.timestamp)); return GST_FLOW_OK; /* ERRORS */ no_rate: { GST_ELEMENT_ERROR (payload, STREAM, NOT_IMPLEMENTED, (NULL), ("subclass did not specify clock-rate")); return GST_FLOW_ERROR; } } /** * gst_basertppayload_push_list: * @payload: a #GstBaseRTPPayload * @list: a #GstBufferList * * Push @list to the peer element of the payloader. The SSRC, payload type, * seqnum and timestamp of the RTP buffer will be updated first. * * This function takes ownership of @list. * * Returns: a #GstFlowReturn. * * Since: 0.10.24 */ GstFlowReturn gst_basertppayload_push_list (GstBaseRTPPayload * payload, GstBufferList * list) { GstFlowReturn res; res = gst_basertppayload_prepare_push (payload, list, TRUE); if (G_LIKELY (res == GST_FLOW_OK)) res = gst_pad_push_list (payload->srcpad, list); else gst_buffer_list_unref (list); return res; } /** * gst_basertppayload_push: * @payload: a #GstBaseRTPPayload * @buffer: a #GstBuffer * * Push @buffer to the peer element of the payloader. The SSRC, payload type, * seqnum and timestamp of the RTP buffer will be updated first. * * This function takes ownership of @buffer. * * Returns: a #GstFlowReturn. */ GstFlowReturn gst_basertppayload_push (GstBaseRTPPayload * payload, GstBuffer * buffer) { GstFlowReturn res; res = gst_basertppayload_prepare_push (payload, buffer, FALSE); if (G_LIKELY (res == GST_FLOW_OK)) res = gst_pad_push (payload->srcpad, buffer); else gst_buffer_unref (buffer); return res; } static void gst_basertppayload_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstBaseRTPPayload *basertppayload; GstBaseRTPPayloadPrivate *priv; gint64 val; basertppayload = GST_BASE_RTP_PAYLOAD (object); priv = basertppayload->priv; switch (prop_id) { case PROP_MTU: basertppayload->mtu = g_value_get_uint (value); break; case PROP_PT: basertppayload->pt = g_value_get_uint (value); break; case PROP_SSRC: val = g_value_get_uint (value); basertppayload->ssrc = val; priv->ssrc_random = FALSE; break; case PROP_TIMESTAMP_OFFSET: val = g_value_get_uint (value); basertppayload->ts_offset = val; priv->ts_offset_random = FALSE; break; case PROP_SEQNUM_OFFSET: val = g_value_get_int (value); basertppayload->seqnum_offset = val; priv->seqnum_offset_random = (val == -1); GST_DEBUG_OBJECT (basertppayload, "seqnum offset 0x%04x, random %d", basertppayload->seqnum_offset, priv->seqnum_offset_random); break; case PROP_MAX_PTIME: basertppayload->priv->prop_max_ptime = g_value_get_int64 (value); update_max_ptime (basertppayload); break; case PROP_MIN_PTIME: basertppayload->min_ptime = g_value_get_int64 (value); break; case PROP_PERFECT_RTPTIME: priv->perfect_rtptime = g_value_get_boolean (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_basertppayload_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstBaseRTPPayload *basertppayload; GstBaseRTPPayloadPrivate *priv; basertppayload = GST_BASE_RTP_PAYLOAD (object); priv = basertppayload->priv; switch (prop_id) { case PROP_MTU: g_value_set_uint (value, basertppayload->mtu); break; case PROP_PT: g_value_set_uint (value, basertppayload->pt); break; case PROP_SSRC: if (priv->ssrc_random) g_value_set_uint (value, -1); else g_value_set_uint (value, basertppayload->ssrc); break; case PROP_TIMESTAMP_OFFSET: if (priv->ts_offset_random) g_value_set_uint (value, -1); else g_value_set_uint (value, (guint32) basertppayload->ts_offset); break; case PROP_SEQNUM_OFFSET: if (priv->seqnum_offset_random) g_value_set_int (value, -1); else g_value_set_int (value, (guint16) basertppayload->seqnum_offset); break; case PROP_MAX_PTIME: g_value_set_int64 (value, basertppayload->max_ptime); break; case PROP_MIN_PTIME: g_value_set_int64 (value, basertppayload->min_ptime); break; case PROP_TIMESTAMP: g_value_set_uint (value, basertppayload->timestamp); break; case PROP_SEQNUM: g_value_set_uint (value, basertppayload->seqnum); break; case PROP_PERFECT_RTPTIME: g_value_set_boolean (value, priv->perfect_rtptime); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstStateChangeReturn gst_basertppayload_change_state (GstElement * element, GstStateChange transition) { GstBaseRTPPayload *basertppayload; GstBaseRTPPayloadPrivate *priv; GstStateChangeReturn ret; basertppayload = GST_BASE_RTP_PAYLOAD (element); priv = basertppayload->priv; switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: break; case GST_STATE_CHANGE_READY_TO_PAUSED: gst_segment_init (&basertppayload->segment, GST_FORMAT_UNDEFINED); if (priv->seqnum_offset_random) basertppayload->seqnum_base = g_random_int_range (0, G_MAXUINT16); else basertppayload->seqnum_base = basertppayload->seqnum_offset; priv->next_seqnum = basertppayload->seqnum_base; basertppayload->seqnum = basertppayload->seqnum_base; if (priv->ssrc_random) basertppayload->current_ssrc = g_random_int (); else basertppayload->current_ssrc = basertppayload->ssrc; if (priv->ts_offset_random) basertppayload->ts_base = g_random_int (); else basertppayload->ts_base = basertppayload->ts_offset; basertppayload->timestamp = basertppayload->ts_base; break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_READY_TO_NULL: break; default: break; } return ret; }