/* 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 "gstrtph263pdepay.h" static GstStaticPadTemplate gst_rtp_h263p_depay_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-h263, " "variant = (string) \"itu\" ") ); static GstStaticPadTemplate gst_rtp_h263p_depay_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp, " "media = (string) \"video\", " "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", " "clock-rate = (int) [1, MAX], " "encoding-name = (string) \"H263-1998\"; " /* optional params */ /* NOTE all optional SDP params must be strings in the caps */ /* "sqcif = (string) [1, 32], " "qcif = (string) [1, 32], " "cif = (string) [1, 32], " "cif4 = (string) [1, 32], " "cif16 = (string) [1, 32], " "custom = (string) ANY, " "f = (string) {0, 1}," "i = (string) {0, 1}," "j = (string) {0, 1}," "t = (string) {0, 1}," "k = (string) {1, 2, 3, 4}," "n = (string) {1, 2, 3, 4}," "p = (string) ANY," "par = (string) ANY, " "cpcf = (string) ANY, " "bpp = (string) [0, 65536], " "hrd = (string) {0, 1}; " */ "application/x-rtp, " "media = (string) \"video\", " "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", " "clock-rate = (int) [1, MAX], " "encoding-name = (string) \"H263-2000\" " /* optional params */ /* NOTE all optional SDP params must be strings in the caps */ /* "profile = (string) [0, 10], " "level = (string) {10, 20, 30, 40, 45, 50, 60, 70}, " "interlace = (string) {0, 1};" */ ) ); GST_BOILERPLATE (GstRtpH263PDepay, gst_rtp_h263p_depay, GstBaseRTPDepayload, GST_TYPE_BASE_RTP_DEPAYLOAD); static void gst_rtp_h263p_depay_finalize (GObject * object); static GstStateChangeReturn gst_rtp_h263p_depay_change_state (GstElement * element, GstStateChange transition); static GstBuffer *gst_rtp_h263p_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf); gboolean gst_rtp_h263p_depay_setcaps (GstBaseRTPDepayload * filter, GstCaps * caps); static void gst_rtp_h263p_depay_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_depay_src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_h263p_depay_sink_template)); gst_element_class_set_details_simple (element_class, "RTP H263 depayloader", "Codec/Depayloader/Network", "Extracts H263/+/++ video from RTP packets (RFC 4629)", "Wim Taymans "); } static void gst_rtp_h263p_depay_class_init (GstRtpH263PDepayClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstBaseRTPDepayloadClass *gstbasertpdepayload_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass; gstbasertpdepayload_class->process = gst_rtp_h263p_depay_process; gstbasertpdepayload_class->set_caps = gst_rtp_h263p_depay_setcaps; gobject_class->finalize = gst_rtp_h263p_depay_finalize; gstelement_class->change_state = gst_rtp_h263p_depay_change_state; } static void gst_rtp_h263p_depay_init (GstRtpH263PDepay * rtph263pdepay, GstRtpH263PDepayClass * klass) { rtph263pdepay->adapter = gst_adapter_new (); } static void gst_rtp_h263p_depay_finalize (GObject * object) { GstRtpH263PDepay *rtph263pdepay; rtph263pdepay = GST_RTP_H263P_DEPAY (object); g_object_unref (rtph263pdepay->adapter); rtph263pdepay->adapter = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } gboolean gst_rtp_h263p_depay_setcaps (GstBaseRTPDepayload * filter, GstCaps * caps) { GstCaps *srccaps = NULL; GstStructure *structure = gst_caps_get_structure (caps, 0); gint clock_rate; const gchar *encoding_name = NULL; gboolean res; if (!gst_structure_get_int (structure, "clock-rate", &clock_rate)) clock_rate = 90000; /* default */ filter->clock_rate = clock_rate; encoding_name = gst_structure_get_string (structure, "encoding-name"); if (encoding_name == NULL) goto no_encoding_name; if (g_ascii_strcasecmp (encoding_name, "H263-2000") == 0) { /* always h263++ */ srccaps = gst_caps_new_simple ("video/x-h263", "variant", G_TYPE_STRING, "itu", "h263version", G_TYPE_STRING, "h263pp", NULL); } else if (g_ascii_strcasecmp (encoding_name, "H263-1998") == 0) { /* this can be H263 or H263+ depending on defined appendixes in the optional * SDP params */ const gchar *F, *I, *J, *T, *K, *N, *P; gboolean is_h263p = FALSE; F = gst_structure_get_string (structure, "f"); if (F) if (g_ascii_strcasecmp (F, "1") == 0) is_h263p = TRUE; I = gst_structure_get_string (structure, "i"); if (I) if (g_ascii_strcasecmp (I, "1") == 0) is_h263p = TRUE; J = gst_structure_get_string (structure, "j"); if (J) if (g_ascii_strcasecmp (J, "1") == 0) is_h263p = TRUE; T = gst_structure_get_string (structure, "t"); if (T) if (g_ascii_strcasecmp (T, "1") == 0) is_h263p = TRUE; K = gst_structure_get_string (structure, "k"); if (K) is_h263p = TRUE; N = gst_structure_get_string (structure, "n"); if (N) is_h263p = TRUE; P = gst_structure_get_string (structure, "p"); if (P) is_h263p = TRUE; if (is_h263p) { srccaps = gst_caps_new_simple ("video/x-h263", "variant", G_TYPE_STRING, "itu", "h263version", G_TYPE_STRING, "h263p", NULL); } else { srccaps = gst_caps_new_simple ("video/x-h263", "variant", G_TYPE_STRING, "itu", "h263version", G_TYPE_STRING, "h263", NULL); } } if (!srccaps) goto no_caps; res = gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (filter), srccaps); gst_caps_unref (srccaps); return res; /* ERRORS */ no_encoding_name: { GST_ERROR_OBJECT (filter, "no encoding-name"); return FALSE; } no_caps: { GST_ERROR_OBJECT (filter, "invalid encoding-name"); return FALSE; } } static GstBuffer * gst_rtp_h263p_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf) { GstRtpH263PDepay *rtph263pdepay; GstBuffer *outbuf; rtph263pdepay = GST_RTP_H263P_DEPAY (depayload); /* flush remaining data on discont */ if (GST_BUFFER_IS_DISCONT (buf)) { GST_LOG_OBJECT (depayload, "DISCONT, flushing adapter"); gst_adapter_clear (rtph263pdepay->adapter); rtph263pdepay->wait_start = TRUE; } { gint payload_len; guint8 *payload; gboolean P, V, M; guint header_len; guint8 PLEN, PEBIT; payload_len = gst_rtp_buffer_get_payload_len (buf); payload = gst_rtp_buffer_get_payload (buf); header_len = 2; if (payload_len < header_len) goto too_small; M = gst_rtp_buffer_get_marker (buf); /* 0 1 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | RR |P|V| PLEN |PEBIT| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ P = (payload[0] & 0x04) == 0x04; V = (payload[0] & 0x02) == 0x02; PLEN = ((payload[0] & 0x1) << 5) | (payload[1] >> 3); PEBIT = payload[1] & 0x7; GST_LOG_OBJECT (depayload, "P %d, V %d, PLEN %d, PEBIT %d", P, V, PLEN, PEBIT); if (V) { header_len++; } if (PLEN) { header_len += PLEN; } if ((!P && payload_len < header_len) || (P && payload_len < header_len - 2)) goto too_small; if (P) { /* FIXME, have to make the packet writable hear. Better to reset these * bytes when we copy the packet below */ rtph263pdepay->wait_start = FALSE; header_len -= 2; payload[header_len] = 0; payload[header_len + 1] = 0; } if (rtph263pdepay->wait_start) goto waiting_start; if (payload_len < header_len) goto too_small; /* FIXME do not ignore the VRC header (See RFC 2429 section 4.2) */ /* FIXME actually use the RTP picture header when it is lost in the network */ /* for now strip off header */ payload += header_len; payload_len -= header_len; if (M) { /* frame is completed: append to previous, push it out */ guint len, padlen; guint avail; GST_LOG_OBJECT (depayload, "Frame complete"); avail = gst_adapter_available (rtph263pdepay->adapter); len = avail + payload_len; padlen = (len % 4) + 4; outbuf = gst_buffer_new_and_alloc (len + padlen); memset (GST_BUFFER_DATA (outbuf) + len, 0, padlen); GST_BUFFER_SIZE (outbuf) = len; /* prepend previous data */ if (avail > 0) { gst_adapter_copy (rtph263pdepay->adapter, GST_BUFFER_DATA (outbuf), 0, avail); gst_adapter_flush (rtph263pdepay->adapter, avail); } memcpy (GST_BUFFER_DATA (outbuf) + avail, payload, payload_len); return outbuf; } else { /* frame not completed: store in adapter */ outbuf = gst_buffer_new_and_alloc (payload_len); GST_LOG_OBJECT (depayload, "Frame incomplete, storing %d", payload_len); memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len); gst_adapter_push (rtph263pdepay->adapter, outbuf); } } return NULL; too_small: { GST_ELEMENT_WARNING (rtph263pdepay, STREAM, DECODE, ("Packet payload was too small"), (NULL)); return NULL; } waiting_start: { GST_DEBUG_OBJECT (rtph263pdepay, "waiting for picture start"); return NULL; } } static GstStateChangeReturn gst_rtp_h263p_depay_change_state (GstElement * element, GstStateChange transition) { GstRtpH263PDepay *rtph263pdepay; GstStateChangeReturn ret; rtph263pdepay = GST_RTP_H263P_DEPAY (element); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: break; case GST_STATE_CHANGE_READY_TO_PAUSED: gst_adapter_clear (rtph263pdepay->adapter); rtph263pdepay->wait_start = TRUE; 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; } gboolean gst_rtp_h263p_depay_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "rtph263pdepay", GST_RANK_MARGINAL, GST_TYPE_RTP_H263P_DEPAY); }