/* 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 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 "gstrtph263ppay.h" #define DEFAULT_FRAGMENTATION_MODE GST_FRAGMENTATION_MODE_NORMAL enum { PROP_0, PROP_FRAGMENTATION_MODE }; #define GST_TYPE_FRAGMENTATION_MODE (gst_fragmentation_mode_get_type()) static GType gst_fragmentation_mode_get_type (void) { static GType fragmentation_mode_type = 0; static const GEnumValue fragmentation_mode[] = { {GST_FRAGMENTATION_MODE_NORMAL, "Normal", "normal"}, {GST_FRAGMENTATION_MODE_SYNC, "Fragment at sync points", "sync"}, {0, NULL, NULL}, }; if (!fragmentation_mode_type) { fragmentation_mode_type = g_enum_register_static ("GstFragmentationMode", fragmentation_mode); } return fragmentation_mode_type; } GST_DEBUG_CATEGORY_STATIC (rtph263ppay_debug); #define GST_CAT_DEFAULT rtph263ppay_debug static GstStaticPadTemplate gst_rtp_h263p_pay_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-h263, " "variant = (string) \"itu\" ") ); static GstStaticPadTemplate gst_rtp_h263p_pay_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp, " "media = (string) \"video\", " "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", " "clock-rate = (int) 90000, " "encoding-name = (string) \"H263-1998\"; " "application/x-rtp, " "media = (string) \"video\", " "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", " "clock-rate = (int) 90000, " "encoding-name = (string) \"H263-2000\"") ); static void gst_rtp_h263p_pay_finalize (GObject * object); static void gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static gboolean gst_rtp_h263p_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps); static GstFlowReturn gst_rtp_h263p_pay_handle_buffer (GstBaseRTPPayload * payload, GstBuffer * buffer); GST_BOILERPLATE (GstRtpH263PPay, gst_rtp_h263p_pay, GstBaseRTPPayload, GST_TYPE_BASE_RTP_PAYLOAD); static void gst_rtp_h263p_pay_base_init (gpointer klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_h263p_pay_src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_h263p_pay_sink_template)); gst_element_class_set_details_simple (element_class, "RTP H263 payloader", "Codec/Payloader/Network/RTP", "Payload-encodes H263/+/++ video in RTP packets (RFC 4629)", "Wim Taymans "); } static void gst_rtp_h263p_pay_class_init (GstRtpH263PPayClass * klass) { GObjectClass *gobject_class; GstBaseRTPPayloadClass *gstbasertppayload_class; gobject_class = (GObjectClass *) klass; gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass; gobject_class->finalize = gst_rtp_h263p_pay_finalize; gobject_class->set_property = gst_rtp_h263p_pay_set_property; gobject_class->get_property = gst_rtp_h263p_pay_get_property; gstbasertppayload_class->set_caps = gst_rtp_h263p_pay_setcaps; gstbasertppayload_class->handle_buffer = gst_rtp_h263p_pay_handle_buffer; g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FRAGMENTATION_MODE, g_param_spec_enum ("fragmentation-mode", "Fragmentation Mode", "Packet Fragmentation Mode", GST_TYPE_FRAGMENTATION_MODE, DEFAULT_FRAGMENTATION_MODE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); GST_DEBUG_CATEGORY_INIT (rtph263ppay_debug, "rtph263ppay", 0, "rtph263ppay (RFC 4629)"); } static void gst_rtp_h263p_pay_init (GstRtpH263PPay * rtph263ppay, GstRtpH263PPayClass * klass) { rtph263ppay->adapter = gst_adapter_new (); rtph263ppay->fragmentation_mode = DEFAULT_FRAGMENTATION_MODE; } static void gst_rtp_h263p_pay_finalize (GObject * object) { GstRtpH263PPay *rtph263ppay; rtph263ppay = GST_RTP_H263P_PAY (object); g_object_unref (rtph263ppay->adapter); rtph263ppay->adapter = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } static gboolean gst_rtp_h263p_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps) { gboolean res; GstCaps *peercaps; gchar *encoding_name = NULL; g_return_val_if_fail (gst_caps_is_fixed (caps), FALSE); peercaps = gst_pad_peer_get_caps (GST_BASE_RTP_PAYLOAD_SRCPAD (payload)); if (peercaps) { GstCaps *intersect = gst_caps_intersect (peercaps, gst_pad_get_pad_template_caps (GST_BASE_RTP_PAYLOAD_SRCPAD (payload))); gst_caps_unref (peercaps); if (!gst_caps_is_empty (intersect)) { GstStructure *s = gst_caps_get_structure (intersect, 0); encoding_name = g_strdup (gst_structure_get_string (s, "encoding-name")); } gst_caps_unref (intersect); } if (!encoding_name) encoding_name = g_strdup ("H263-1998"); gst_basertppayload_set_options (payload, "video", TRUE, (gchar *) encoding_name, 90000); res = gst_basertppayload_set_outcaps (payload, NULL); g_free (encoding_name); return res; } static void gst_rtp_h263p_pay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstRtpH263PPay *rtph263ppay; rtph263ppay = GST_RTP_H263P_PAY (object); switch (prop_id) { case PROP_FRAGMENTATION_MODE: rtph263ppay->fragmentation_mode = g_value_get_enum (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_rtp_h263p_pay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstRtpH263PPay *rtph263ppay; rtph263ppay = GST_RTP_H263P_PAY (object); switch (prop_id) { case PROP_FRAGMENTATION_MODE: g_value_set_enum (value, rtph263ppay->fragmentation_mode); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstFlowReturn gst_rtp_h263p_pay_flush (GstRtpH263PPay * rtph263ppay) { guint avail; GstBuffer *outbuf; GstFlowReturn ret; gboolean fragmented; avail = gst_adapter_available (rtph263ppay->adapter); if (avail == 0) return GST_FLOW_OK; fragmented = FALSE; /* This algorithm assumes the H263/+/++ encoder sends complete frames in each * buffer */ /* With Fragmentation Mode at GST_FRAGMENTATION_MODE_NORMAL: * This algorithm implements the Follow-on packets method for packetization. * This assumes low packet loss network. * With Fragmentation Mode at GST_FRAGMENTATION_MODE_SYNC: * This algorithm separates large frames at synchronisation points (Segments) * (See RFC 4629 section 6). It would be interesting to have a property such as network * quality to select between both packetization methods */ /* TODO Add VRC supprt (See RFC 4629 section 5.2) */ while (avail > 0) { guint towrite; guint8 *payload; guint payload_len; gint header_len; guint next_gop = 0; gboolean found_gob = FALSE; if (rtph263ppay->fragmentation_mode == GST_FRAGMENTATION_MODE_SYNC) { /* start after 1st gop possible */ guint parsed_len = 3; const guint8 *parse_data = NULL; parse_data = gst_adapter_peek (rtph263ppay->adapter, avail); /* Check if we have a gob or eos , eossbs */ /* FIXME EOS and EOSSBS packets should never contain any gobs and vice-versa */ if (avail >= 3 && *parse_data == 0 && *(parse_data + 1) == 0 && *(parse_data + 2) >= 0x80) { GST_DEBUG_OBJECT (rtph263ppay, " Found GOB header"); found_gob = TRUE; } /* Find next and cut the packet accordingly */ /* TODO we should get as many gobs as possible until MTU is reached, this * code seems to just get one GOB per packet */ while (parsed_len + 2 < avail) { if (parse_data[parsed_len] == 0 && parse_data[parsed_len + 1] == 0 && parse_data[parsed_len + 2] >= 0x80) { next_gop = parsed_len; GST_DEBUG_OBJECT (rtph263ppay, " Next GOB Detected at : %d", next_gop); break; } parsed_len++; } } /* for picture start frames (non-fragmented), we need to remove the first * two 0x00 bytes and set P=1 */ header_len = (fragmented && !found_gob) ? 2 : 0; towrite = MIN (avail, gst_rtp_buffer_calc_payload_len (GST_BASE_RTP_PAYLOAD_MTU (rtph263ppay) - header_len, 0, 0)); if (next_gop > 0) towrite = MIN (next_gop, towrite); payload_len = header_len + towrite; outbuf = gst_rtp_buffer_new_allocate (payload_len, 0, 0); /* last fragment gets the marker bit set */ gst_rtp_buffer_set_marker (outbuf, avail > towrite ? 0 : 1); payload = gst_rtp_buffer_get_payload (outbuf); gst_adapter_copy (rtph263ppay->adapter, &payload[header_len], 0, towrite); /* 0 1 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | RR |P|V| PLEN |PEBIT| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ /* if fragmented or gop header , write p bit =1 */ payload[0] = (fragmented && !found_gob) ? 0x00 : 0x04; payload[1] = 0; GST_BUFFER_TIMESTAMP (outbuf) = rtph263ppay->first_timestamp; GST_BUFFER_DURATION (outbuf) = rtph263ppay->first_duration; gst_adapter_flush (rtph263ppay->adapter, towrite); ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtph263ppay), outbuf); avail -= towrite; fragmented = TRUE; } return ret; } static GstFlowReturn gst_rtp_h263p_pay_handle_buffer (GstBaseRTPPayload * payload, GstBuffer * buffer) { GstRtpH263PPay *rtph263ppay; GstFlowReturn ret; rtph263ppay = GST_RTP_H263P_PAY (payload); rtph263ppay->first_timestamp = GST_BUFFER_TIMESTAMP (buffer); rtph263ppay->first_duration = GST_BUFFER_DURATION (buffer); /* we always encode and flush a full picture */ gst_adapter_push (rtph263ppay->adapter, buffer); ret = gst_rtp_h263p_pay_flush (rtph263ppay); return ret; } gboolean gst_rtp_h263p_pay_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "rtph263ppay", GST_RANK_SECONDARY, GST_TYPE_RTP_H263P_PAY); }