/* 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 */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include "gstrtph263pay.h" #define GST_RFC2190A_HEADER_LEN 4 typedef struct _GstRFC2190AHeader { #if G_BYTE_ORDER == G_LITTLE_ENDIAN unsigned int ebit:3; /* End position */ unsigned int sbit:3; /* Start position */ unsigned int p:1; /* PB-frames mode */ unsigned int f:1; /* flag bit */ unsigned int r1:1; /* Reserved */ unsigned int a:1; /* Advanced Prediction */ unsigned int s:1; /* syntax based arithmetic coding */ unsigned int u:1; /* Unrestricted motion vector */ unsigned int i:1; /* Picture coding type */ unsigned int src:3; /* Source format */ unsigned int trb:3; /* Temporal ref for B frame */ unsigned int dbq:2; /* Differential Quantisation parameter */ unsigned int r2:3; /* Reserved */ #elif G_BYTE_ORDER == G_BIG_ENDIAN unsigned int f:1; /* flag bit */ unsigned int p:1; /* PB-frames mode */ unsigned int sbit:3; /* Start position */ unsigned int ebit:3; /* End position */ unsigned int src:3; /* Source format */ unsigned int i:1; /* Picture coding type */ unsigned int u:1; /* Unrestricted motion vector */ unsigned int s:1; /* syntax based arithmetic coding */ unsigned int a:1; /* Advanced Prediction */ unsigned int r1:1; /* Reserved */ unsigned int r2:3; /* Reserved */ unsigned int dbq:2; /* Differential Quantisation parameter */ unsigned int trb:3; /* Temporal ref for B frame */ #else #error "G_BYTE_ORDER should be big or little endian." #endif guint8 tr; /* Temporal ref for P frame */ } GstRFC2190AHeader; #define GST_RFC2190A_HEADER_F(buf) (((GstRFC2190AHeader *)(buf))->f) #define GST_RFC2190A_HEADER_P(buf) (((GstRFC2190AHeader *)(buf))->p) #define GST_RFC2190A_HEADER_SBIT(buf) (((GstRFC2190AHeader *)(buf))->sbit) #define GST_RFC2190A_HEADER_EBIT(buf) (((GstRFC2190AHeader *)(buf))->ebit) #define GST_RFC2190A_HEADER_SRC(buf) (((GstRFC2190AHeader *)(buf))->src) #define GST_RFC2190A_HEADER_I(buf) (((GstRFC2190AHeader *)(buf))->i) #define GST_RFC2190A_HEADER_U(buf) (((GstRFC2190AHeader *)(buf))->u) #define GST_RFC2190A_HEADER_S(buf) (((GstRFC2190AHeader *)(buf))->s) #define GST_RFC2190A_HEADER_A(buf) (((GstRFC2190AHeader *)(buf))->a) #define GST_RFC2190A_HEADER_R1(buf) (((GstRFC2190AHeader *)(buf))->r1) #define GST_RFC2190A_HEADER_R2(buf) (((GstRFC2190AHeader *)(buf))->r2) #define GST_RFC2190A_HEADER_DBQ(buf) (((GstRFC2190AHeader *)(buf))->dbq) #define GST_RFC2190A_HEADER_TRB(buf) (((GstRFC2190AHeader *)(buf))->trb) #define GST_RFC2190A_HEADER_TR(buf) (((GstRFC2190AHeader *)(buf))->tr) typedef struct _GstH263PictureLayer { #if G_BYTE_ORDER == G_LITTLE_ENDIAN unsigned int psc1:16; unsigned int tr1:2; unsigned int psc2:6; unsigned int ptype_263:1; unsigned int ptype_start:1; unsigned int tr2:6; unsigned int ptype_umvmode:1; unsigned int ptype_pictype:1; unsigned int ptype_srcformat:3; unsigned int ptype_freeze:1; unsigned int ptype_camera:1; unsigned int ptype_split:1; unsigned int chaff:5; unsigned int ptype_pbmode:1; unsigned int ptype_apmode:1; unsigned int ptype_sacmode:1; #elif G_BYTE_ORDER == G_BIG_ENDIAN unsigned int psc1:16; unsigned int psc2:6; unsigned int tr1:2; unsigned int tr2:6; unsigned int ptype_start:1; unsigned int ptype_263:1; unsigned int ptype_split:1; unsigned int ptype_camera:1; unsigned int ptype_freeze:1; unsigned int ptype_srcformat:3; unsigned int ptype_pictype:1; unsigned int ptype_umvmode:1; unsigned int ptype_sacmode:1; unsigned int ptype_apmode:1; unsigned int ptype_pbmode:1; unsigned int chaff:5; #else #error "G_BYTE_ORDER should be big or little endian." #endif } GstH263PictureLayer; #define GST_H263_PICTURELAYER_PLSRC(buf) (((GstH263PictureLayer *)(buf))->ptype_srcformat) #define GST_H263_PICTURELAYER_PLTYPE(buf) (((GstH263PictureLayer *)(buf))->ptype_pictype) #define GST_H263_PICTURELAYER_PLUMV(buf) (((GstH263PictureLayer *)(buf))->ptype_umvmode) #define GST_H263_PICTURELAYER_PLSAC(buf) (((GstH263PictureLayer *)(buf))->ptype_sacmode) #define GST_H263_PICTURELAYER_PLAP(buf) (((GstH263PictureLayer *)(buf))->ptype_apmode) /* elementfactory information */ static const GstElementDetails gst_rtp_h263pay_details = GST_ELEMENT_DETAILS ("RTP packet parser", "Codec/Payloader/Network", "Payload-encodes H263 video in RTP packets (RFC 2190)", "Neil Stratford "); static GstStaticPadTemplate gst_rtp_h263_pay_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-h263") ); static GstStaticPadTemplate gst_rtp_h263_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) [ 96, 127 ], " "clock-rate = (int) 90000, " "encoding-name = (string) \"H263-1998\"") ); static void gst_rtp_h263_pay_class_init (GstRtpH263PayClass * klass); static void gst_rtp_h263_pay_base_init (GstRtpH263PayClass * klass); static void gst_rtp_h263_pay_init (GstRtpH263Pay * rtph263pay); static void gst_rtp_h263_pay_finalize (GObject * object); static gboolean gst_rtp_h263_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps); static GstFlowReturn gst_rtp_h263_pay_handle_buffer (GstBaseRTPPayload * payload, GstBuffer * buffer); static GstBaseRTPPayloadClass *parent_class = NULL; static GType gst_rtp_h263_pay_get_type (void) { static GType rtph263pay_type = 0; if (!rtph263pay_type) { static const GTypeInfo rtph263pay_info = { sizeof (GstRtpH263PayClass), (GBaseInitFunc) gst_rtp_h263_pay_base_init, NULL, (GClassInitFunc) gst_rtp_h263_pay_class_init, NULL, NULL, sizeof (GstRtpH263Pay), 0, (GInstanceInitFunc) gst_rtp_h263_pay_init, }; rtph263pay_type = g_type_register_static (GST_TYPE_BASE_RTP_PAYLOAD, "GstRtpH263Pay", &rtph263pay_info, 0); } return rtph263pay_type; } static void gst_rtp_h263_pay_base_init (GstRtpH263PayClass * klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_h263_pay_src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_h263_pay_sink_template)); gst_element_class_set_details (element_class, &gst_rtp_h263pay_details); } static void gst_rtp_h263_pay_class_init (GstRtpH263PayClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstBaseRTPPayloadClass *gstbasertppayload_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gstbasertppayload_class = (GstBaseRTPPayloadClass *) klass; parent_class = g_type_class_peek_parent (klass); gobject_class->finalize = gst_rtp_h263_pay_finalize; gstbasertppayload_class->set_caps = gst_rtp_h263_pay_setcaps; gstbasertppayload_class->handle_buffer = gst_rtp_h263_pay_handle_buffer; } static void gst_rtp_h263_pay_init (GstRtpH263Pay * rtph263pay) { rtph263pay->adapter = gst_adapter_new (); } static void gst_rtp_h263_pay_finalize (GObject * object) { GstRtpH263Pay *rtph263pay; rtph263pay = GST_RTP_H263_PAY (object); g_object_unref (rtph263pay->adapter); rtph263pay->adapter = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } static gboolean gst_rtp_h263_pay_setcaps (GstBaseRTPPayload * payload, GstCaps * caps) { gst_basertppayload_set_options (payload, "video", TRUE, "H263-1998", 90000); gst_basertppayload_set_outcaps (payload, NULL); return TRUE; } static guint gst_rtp_h263_pay_gobfiner (guint8 * data, guint len, guint curpos) { guint16 test = 0xffff; guint i; /* If we are past the end, stop */ if (curpos >= len) return 0; /* start at curpos and loop looking for next gob start */ for (i = curpos; i < len; i++) { test = (test << 8) | data[i]; if ((test == 0) && (i > curpos + 4)) { return i - 3; } } return len; } static GstFlowReturn gst_rtp_h263_pay_flush (GstRtpH263Pay * rtph263pay) { guint avail; GstBuffer *outbuf; GstFlowReturn ret = 0; gboolean fragmented; guint8 *data, *header; GstH263PictureLayer *piclayer; guint8 *payload; guint payload_len, total_len; guint curpos, nextgobpos; avail = gst_adapter_available (rtph263pay->adapter); if (avail == 0) return GST_FLOW_OK; fragmented = FALSE; /* Get a pointer to all the data for the frame */ data = (guint8 *) gst_adapter_peek (rtph263pay->adapter, avail); /* Start at the begining and loop looking for gobs */ curpos = 0; /* Picture header */ piclayer = (GstH263PictureLayer *) data; while ((nextgobpos = gst_rtp_h263_pay_gobfiner (data, avail, curpos)) > 0) { payload_len = nextgobpos - curpos; total_len = payload_len + GST_RFC2190A_HEADER_LEN; outbuf = gst_rtp_buffer_new_allocate (total_len, 0, 0); header = gst_rtp_buffer_get_payload (outbuf); payload = header + GST_RFC2190A_HEADER_LEN; /* Build the headers */ GST_RFC2190A_HEADER_F (header) = 0; GST_RFC2190A_HEADER_P (header) = 0; GST_RFC2190A_HEADER_SBIT (header) = 0; GST_RFC2190A_HEADER_EBIT (header) = 0; GST_RFC2190A_HEADER_SRC (header) = GST_H263_PICTURELAYER_PLSRC (piclayer); GST_RFC2190A_HEADER_I (header) = GST_H263_PICTURELAYER_PLTYPE (piclayer); GST_RFC2190A_HEADER_U (header) = GST_H263_PICTURELAYER_PLUMV (piclayer); GST_RFC2190A_HEADER_S (header) = GST_H263_PICTURELAYER_PLSAC (piclayer); GST_RFC2190A_HEADER_A (header) = GST_H263_PICTURELAYER_PLAP (piclayer); GST_RFC2190A_HEADER_R1 (header) = 0; GST_RFC2190A_HEADER_R2 (header) = 0; GST_RFC2190A_HEADER_DBQ (header) = 0; GST_RFC2190A_HEADER_TRB (header) = 0; GST_RFC2190A_HEADER_TR (header) = 0; /* last fragment gets the marker bit set */ gst_rtp_buffer_set_marker (outbuf, nextgobpos < avail ? 0 : 1); memcpy (payload, data + curpos, payload_len); GST_BUFFER_TIMESTAMP (outbuf) = rtph263pay->first_ts; ret = gst_basertppayload_push (GST_BASE_RTP_PAYLOAD (rtph263pay), outbuf); curpos = nextgobpos; } /* Flush the whole packet */ gst_adapter_flush (rtph263pay->adapter, avail); return ret; } static GstFlowReturn gst_rtp_h263_pay_handle_buffer (GstBaseRTPPayload * payload, GstBuffer * buffer) { GstRtpH263Pay *rtph263pay; GstFlowReturn ret; guint size; rtph263pay = GST_RTP_H263_PAY (payload); size = GST_BUFFER_SIZE (buffer); rtph263pay->first_ts = GST_BUFFER_TIMESTAMP (buffer); /* we always encode and flush a full picture */ gst_adapter_push (rtph263pay->adapter, buffer); ret = gst_rtp_h263_pay_flush (rtph263pay); return ret; } gboolean gst_rtp_h263_pay_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "rtph263pay", GST_RANK_NONE, GST_TYPE_RTP_H263_PAY); }