/* GStreamer * Copyright (C) <2010> 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 details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include "gstrtpgstpay.h" GST_DEBUG_CATEGORY_STATIC (gst_rtp_pay_debug); #define GST_CAT_DEFAULT gst_rtp_pay_debug /* * 0 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |C| CV |D|0|0|0| ETYPE | MBZ | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Frag_offset | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * * C: caps inlined flag * When C set, first part of payload contains caps definition. Caps definition * starts with variable-length length prefix and then a string of that length. * the length is encoded in big endian 7 bit chunks, the top 1 bit of a byte * is the continuation marker and the 7 next bits the data. A continuation * marker of 1 means that the next byte contains more data. * * CV: caps version, 0 = caps from SDP, 1 - 7 inlined caps * D: delta unit buffer * ETYPE: type of event. Payload contains the event, prefixed with a * variable length field. * 0 = NO event * 1 = GST_EVENT_TAG * 2 = GST_EVENT_CUSTOM_DOWNSTREAM * 3 = GST_EVENT_CUSTOM_BOTH */ static GstStaticPadTemplate gst_rtp_gst_pay_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); static GstStaticPadTemplate gst_rtp_gst_pay_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp, " "media = (string) \"application\", " "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", " "clock-rate = (int) 90000, " "encoding-name = (string) \"X-GST\"") ); static void gst_rtp_gst_pay_finalize (GObject * obj); static gboolean gst_rtp_gst_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps); static GstFlowReturn gst_rtp_gst_pay_handle_buffer (GstRTPBasePayload * payload, GstBuffer * buffer); static gboolean gst_rtp_gst_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event); #define gst_rtp_gst_pay_parent_class parent_class G_DEFINE_TYPE (GstRtpGSTPay, gst_rtp_gst_pay, GST_TYPE_RTP_BASE_PAYLOAD); static void gst_rtp_gst_pay_class_init (GstRtpGSTPayClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstRTPBasePayloadClass *gstrtpbasepayload_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gstrtpbasepayload_class = (GstRTPBasePayloadClass *) klass; gobject_class->finalize = gst_rtp_gst_pay_finalize; gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&gst_rtp_gst_pay_src_template)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&gst_rtp_gst_pay_sink_template)); gst_element_class_set_static_metadata (gstelement_class, "RTP GStreamer payloader", "Codec/Payloader/Network/RTP", "Payload GStreamer buffers as RTP packets", "Wim Taymans "); gstrtpbasepayload_class->set_caps = gst_rtp_gst_pay_setcaps; gstrtpbasepayload_class->handle_buffer = gst_rtp_gst_pay_handle_buffer; gstrtpbasepayload_class->sink_event = gst_rtp_gst_pay_sink_event; GST_DEBUG_CATEGORY_INIT (gst_rtp_pay_debug, "rtpgstpay", 0, "rtpgstpay element"); } static void gst_rtp_gst_pay_init (GstRtpGSTPay * rtpgstpay) { rtpgstpay->adapter = gst_adapter_new (); gst_rtp_base_payload_set_options (GST_RTP_BASE_PAYLOAD (rtpgstpay), "application", TRUE, "X-GST", 90000); } static void gst_rtp_gst_pay_finalize (GObject * obj) { GstRtpGSTPay *rtpgstpay; rtpgstpay = GST_RTP_GST_PAY (obj); g_object_unref (rtpgstpay->adapter); G_OBJECT_CLASS (parent_class)->finalize (obj); } static GstFlowReturn gst_rtp_gst_pay_flush (GstRtpGSTPay * rtpgstpay, GstClockTime timestamp) { GstFlowReturn ret; guint avail; guint frag_offset; GstBufferList *list; frag_offset = 0; avail = gst_adapter_available (rtpgstpay->adapter); if (avail == 0) return GST_FLOW_OK; list = gst_buffer_list_new (); while (avail) { guint towrite; guint8 *payload; guint payload_len; guint packet_len; GstBuffer *outbuf; GstRTPBuffer rtp = { NULL }; GstBuffer *paybuf; /* this will be the total lenght of the packet */ packet_len = gst_rtp_buffer_calc_packet_len (8 + avail, 0, 0); /* fill one MTU or all available bytes */ towrite = MIN (packet_len, GST_RTP_BASE_PAYLOAD_MTU (rtpgstpay)); /* this is the payload length */ payload_len = gst_rtp_buffer_calc_payload_len (towrite, 0, 0); /* create buffer to hold the header */ outbuf = gst_rtp_buffer_new_allocate (8, 0, 0); gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp); payload = gst_rtp_buffer_get_payload (&rtp); GST_DEBUG_OBJECT (rtpgstpay, "new packet len %u, frag %u", packet_len, frag_offset); /* * 0 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |C| CV |D|0|0|0| ETYPE | MBZ | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Frag_offset | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ payload[0] = rtpgstpay->flags; payload[1] = rtpgstpay->etype; payload[2] = payload[3] = 0; payload[4] = frag_offset >> 24; payload[5] = frag_offset >> 16; payload[6] = frag_offset >> 8; payload[7] = frag_offset & 0xff; payload += 8; payload_len -= 8; frag_offset += payload_len; avail -= payload_len; if (avail == 0) gst_rtp_buffer_set_marker (&rtp, TRUE); gst_rtp_buffer_unmap (&rtp); /* create a new buf to hold the payload */ GST_DEBUG_OBJECT (rtpgstpay, "take %u bytes from adapter", payload_len); paybuf = gst_adapter_take_buffer_fast (rtpgstpay->adapter, payload_len); /* create a new group to hold the rtp header and the payload */ gst_buffer_append (outbuf, paybuf); GST_BUFFER_TIMESTAMP (outbuf) = timestamp; /* and add to list */ gst_buffer_list_insert (list, -1, outbuf); } /* push the whole buffer list at once */ ret = gst_rtp_base_payload_push_list (GST_RTP_BASE_PAYLOAD (rtpgstpay), list); rtpgstpay->flags &= 0x70; rtpgstpay->etype = 0; return ret; } static GstBuffer * make_data_buffer (GstRtpGSTPay * rtpgstpay, gchar * data, guint size) { guint plen; guint8 *ptr; GstBuffer *outbuf; GstMapInfo map; /* calculate length */ plen = 1; while (size >> (7 * plen)) plen++; outbuf = gst_buffer_new_allocate (NULL, plen + size, NULL); gst_buffer_map (outbuf, &map, GST_MAP_WRITE); ptr = map.data; /* write length */ while (plen) { plen--; *ptr++ = ((plen > 0) ? 0x80 : 0) | ((size >> (7 * plen)) & 0x7f); } /* copy data */ memcpy (ptr, data, size); gst_buffer_unmap (outbuf, &map); return outbuf; } static gboolean gst_rtp_gst_pay_setcaps (GstRTPBasePayload * payload, GstCaps * caps) { GstRtpGSTPay *rtpgstpay; gboolean res; gchar *capsstr, *capsenc, *capsver; guint capslen; GstBuffer *outbuf; rtpgstpay = GST_RTP_GST_PAY (payload); capsstr = gst_caps_to_string (caps); capslen = strlen (capsstr); rtpgstpay->current_CV = rtpgstpay->next_CV; /* encode without 0 byte */ capsenc = g_base64_encode ((guchar *) capsstr, capslen); GST_DEBUG_OBJECT (payload, "caps=%s, caps(base64)=%s", capsstr, capsenc); /* for 0 byte */ capslen++; /* make a data buffer of it */ outbuf = make_data_buffer (rtpgstpay, capsstr, capslen); g_free (capsstr); /* store in adapter, we don't flush yet, buffer might follow */ rtpgstpay->flags = (1 << 7) | (rtpgstpay->current_CV << 4); rtpgstpay->next_CV = (rtpgstpay->next_CV + 1) & 0x7; gst_adapter_push (rtpgstpay->adapter, outbuf); /* make caps for SDP */ capsver = g_strdup_printf ("%d", rtpgstpay->current_CV); res = gst_rtp_base_payload_set_outcaps (payload, "caps", G_TYPE_STRING, capsenc, "capsversion", G_TYPE_STRING, capsver, NULL); g_free (capsenc); g_free (capsver); return res; } static gboolean gst_rtp_gst_pay_sink_event (GstRTPBasePayload * payload, GstEvent * event) { gboolean ret; GstRtpGSTPay *rtpgstpay; guint etype; rtpgstpay = GST_RTP_GST_PAY (payload); ret = GST_RTP_BASE_PAYLOAD_CLASS (parent_class)->sink_event (payload, gst_event_ref (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_TAG: etype = 1; break; case GST_EVENT_CUSTOM_DOWNSTREAM: etype = 2; break; case GST_EVENT_CUSTOM_BOTH: etype = 2; break; default: etype = 0; GST_LOG_OBJECT (rtpgstpay, "no event for %s", GST_EVENT_TYPE_NAME (event)); break; } if (etype) { const GstStructure *s; gchar *estr; guint elen; GstBuffer *outbuf; /* make sure the adapter is flushed */ gst_rtp_gst_pay_flush (rtpgstpay, GST_CLOCK_TIME_NONE); GST_DEBUG_OBJECT (rtpgstpay, "make event type %d for %s", etype, GST_EVENT_TYPE_NAME (event)); s = gst_event_get_structure (event); estr = gst_structure_to_string (s); elen = strlen (estr); outbuf = make_data_buffer (rtpgstpay, estr, elen); g_free (estr); rtpgstpay->etype = etype; gst_adapter_push (rtpgstpay->adapter, outbuf); /* flush the adapter immediately */ gst_rtp_gst_pay_flush (rtpgstpay, GST_CLOCK_TIME_NONE); } gst_event_unref (event); return ret; } static GstFlowReturn gst_rtp_gst_pay_handle_buffer (GstRTPBasePayload * basepayload, GstBuffer * buffer) { GstFlowReturn ret; GstRtpGSTPay *rtpgstpay; GstClockTime timestamp; rtpgstpay = GST_RTP_GST_PAY (basepayload); timestamp = GST_BUFFER_TIMESTAMP (buffer); /* caps always from SDP for now */ if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT)) rtpgstpay->flags |= (1 << 3); gst_adapter_push (rtpgstpay->adapter, buffer); ret = gst_rtp_gst_pay_flush (rtpgstpay, timestamp); return ret; } gboolean gst_rtp_gst_pay_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "rtpgstpay", GST_RANK_NONE, GST_TYPE_RTP_GST_PAY); }