gstreamer/gst/rtp/gstrtph263pdepay.c
2012-04-10 00:51:41 +01:00

397 lines
11 KiB
C

/* GStreamer
* Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.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 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 <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#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};"
*/
)
);
#define gst_rtp_h263p_depay_parent_class parent_class
G_DEFINE_TYPE (GstRtpH263PDepay, gst_rtp_h263p_depay,
GST_TYPE_RTP_BASE_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 (GstRTPBaseDepayload * depayload,
GstBuffer * buf);
gboolean gst_rtp_h263p_depay_setcaps (GstRTPBaseDepayload * filter,
GstCaps * caps);
static void
gst_rtp_h263p_depay_class_init (GstRtpH263PDepayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
gobject_class->finalize = gst_rtp_h263p_depay_finalize;
gstelement_class->change_state = gst_rtp_h263p_depay_change_state;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_h263p_depay_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_h263p_depay_sink_template));
gst_element_class_set_static_metadata (gstelement_class,
"RTP H263 depayloader", "Codec/Depayloader/Network/RTP",
"Extracts H263/+/++ video from RTP packets (RFC 4629)",
"Wim Taymans <wim.taymans@gmail.com>");
gstrtpbasedepayload_class->process = gst_rtp_h263p_depay_process;
gstrtpbasedepayload_class->set_caps = gst_rtp_h263p_depay_setcaps;
}
static void
gst_rtp_h263p_depay_init (GstRtpH263PDepay * rtph263pdepay)
{
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 (GstRTPBaseDepayload * 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_RTP_BASE_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 (GstRTPBaseDepayload * depayload, GstBuffer * buf)
{
GstRtpH263PDepay *rtph263pdepay;
GstBuffer *outbuf;
gint payload_len;
guint8 *payload;
gboolean P, V, M;
guint header_len;
guint8 PLEN, PEBIT;
GstRTPBuffer rtp = { NULL };
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;
}
gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
payload_len = gst_rtp_buffer_get_payload_len (&rtp);
header_len = 2;
if (payload_len < header_len)
goto too_small;
payload = gst_rtp_buffer_get_payload (&rtp);
M = gst_rtp_buffer_get_marker (&rtp);
/* 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;
GstMapInfo map;
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);
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
memset (map.data + len, 0, padlen);
/* prepend previous data */
if (avail > 0) {
gst_adapter_copy (rtph263pdepay->adapter, map.data, 0, avail);
gst_adapter_flush (rtph263pdepay->adapter, avail);
}
memcpy (map.data + avail, payload, payload_len);
gst_buffer_unmap (outbuf, &map);
gst_rtp_buffer_unmap (&rtp);
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);
gst_buffer_fill (outbuf, 0, payload, payload_len);
gst_adapter_push (rtph263pdepay->adapter, outbuf);
gst_rtp_buffer_unmap (&rtp);
}
return NULL;
too_small:
{
GST_ELEMENT_WARNING (rtph263pdepay, STREAM, DECODE,
("Packet payload was too small"), (NULL));
gst_rtp_buffer_unmap (&rtp);
return NULL;
}
waiting_start:
{
GST_DEBUG_OBJECT (rtph263pdepay, "waiting for picture start");
gst_rtp_buffer_unmap (&rtp);
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_SECONDARY, GST_TYPE_RTP_H263P_DEPAY);
}