gstreamer/gst/rtp/gstrtph263pay.c

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/* GStreamer
* Copyright (C) <2005> Wim Taymans <wim@fluendo.com>
*
* 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 <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#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 GstElementDetails gst_rtp_h263pay_details = {
"RTP packet parser",
"Codec/Payloader/Network",
"Payload-encodes H263 video in RTP packets (RFC 2190)",
"Neil Stratford <neils@vipadia.com>"
};
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_ref (GST_TYPE_BASE_RTP_PAYLOAD);
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);
}