gstreamer/ext/apexsink/gstapexraop.c

701 lines
19 KiB
C

/* GStreamer - Remote Audio Access Protocol (RAOP) as used in Apple iTunes to stream music to the Airport Express (ApEx) -
*
* RAOP is based on the Real Time Streaming Protocol (RTSP) but with an extra challenge-response RSA based authentication step.
* This interface accepts RAW PCM data and set it as AES encrypted ALAC while performing emission.
*
* Copyright (C) 2008 Jérémie Bernard [GRemi] <gremimail@gmail.com>
*
* gstapexraop.c
*
* 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 "gstapexraop.h"
/* private constants */
#define GST_APEX_RAOP_VOLUME_MIN -144
#define GST_APEX_RAOP_VOLUME_MAX 0
#define GST_APEX_RAOP_HDR_DEFAULT_LENGTH 1024
#define GST_APEX_RAOP_SDP_DEFAULT_LENGTH 2048
const static gchar GST_APEX_RAOP_RSA_PUBLIC_MOD[] =
"59dE8qLieItsH1WgjrcFRKj6eUWqi+bGLOX1HL3U3GhC/j0Qg90u3sG/1CUtwC"
"5vOYvfDmFI6oSFXi5ELabWJmT2dKHzBJKa3k9ok+8t9ucRqMd6DZHJ2YCCLlDR"
"KSKv6kDqnw4UwPdpOMXziC/AMj3Z/lUVX1G7WSHCAWKf1zNS1eLvqr+boEjXuB"
"OitnZ/bDzPHrTOZz0Dew0uowxf/+sG+NCK3eQJVxqcaJ/vEHKIVd2M+5qL71yJ"
"Q+87X6oV3eaYvt3zWZYD6z5vYTcrtij2VZ9Zmni/UAaHqn9JdsBWLUEpVviYnh"
"imNVvYFZeCXg/IdTQ+x4IRdiXNv5hEew==";
const static gchar GST_APEX_RAOP_RSA_PUBLIC_EXP[] = "AQAB";
const static gchar GST_APEX_RAOP_USER_AGENT[] =
"iTunes/4.6 (Macintosh; U; PPC Mac OS X 10.3)";
const static guchar GST_APEX_RAOP_FRAME_HEADER[] = {
0x24, 0x00, 0x00, 0x00,
0xF0, 0xFF, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
};
const static int GST_APEX_RAOP_FRAME_HEADER_SIZE = 16;
const static int GST_APEX_RAOP_ALAC_HEADER_SIZE = 3;
/* string extra utility */
static gint
g_strdel (gchar * str, gchar rc)
{
int i = 0, j = 0, len, num = 0;
len = strlen (str);
while (i < len) {
if (str[i] == rc) {
for (j = i; j < len; j++)
str[j] = str[j + 1];
len--;
num++;
} else {
i++;
}
}
return num;
}
/* socket utilities */
static int
gst_apexraop_send (int desc, void *data, size_t len)
{
int total = 0, bytesleft = len, n = 0;
while (total < len) {
n = send (desc, ((const char *) data) + total, bytesleft, 0);
if (n == -1)
break;
total += n;
bytesleft -= n;
}
return n == -1 ? -1 : total;
}
static int
gst_apexraop_recv (int desc, void *data, size_t len)
{
bzero (data, len);
return recv (desc, data, len, 0);
}
/* public opaque handle resolution */
typedef struct
{
guchar aes_ky[AES_BLOCK_SIZE]; /* AES random key */
guchar aes_iv[AES_BLOCK_SIZE]; /* AES random initial vector */
guchar url_abspath[16]; /* header url random absolute path addon, ANNOUNCE id */
gint cseq; /* header rtsp inc cseq */
guchar cid[24]; /* header client instance id */
gchar *session; /* header raop negotiated session id, once SETUP performed */
gchar *ua; /* header user agent */
GstApExJackType jack_type; /* APEX connected jack type, once ANNOUNCE performed */
GstApExJackStatus jack_status; /* APEX connected jack status, once ANNOUNCE performed */
gchar *host; /* APEX target ip */
guint ctrl_port; /* APEX target control port */
guint data_port; /* APEX negotiated data port, once SETUP performed */
int ctrl_sd; /* control socket */
struct sockaddr_in ctrl_sd_in;
int data_sd; /* data socket */
struct sockaddr_in data_sd_in;
}
_GstApExRAOP;
/* raop apex struct allocation */
GstApExRAOP *
gst_apexraop_new (const gchar * host, const guint16 port)
{
_GstApExRAOP *apexraop;
apexraop = (_GstApExRAOP *) g_malloc0 (sizeof (_GstApExRAOP));
apexraop->host = g_strdup (host);
apexraop->ctrl_port = port;
apexraop->ua = g_strdup (GST_APEX_RAOP_USER_AGENT);
apexraop->jack_type = GST_APEX_JACK_TYPE_UNDEFINED;
apexraop->jack_status = GST_APEX_JACK_STATUS_DISCONNECTED;
return (GstApExRAOP *) apexraop;
}
/* raop apex struct freeing */
void
gst_apexraop_free (GstApExRAOP * con)
{
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
g_free (conn->host);
g_free (conn->session);
g_free (conn->ua);
g_free (conn);
}
/* host affectation */
void
gst_apexraop_set_host (GstApExRAOP * con, const gchar * host)
{
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
g_free (conn->host);
conn->host = g_strdup (host);
}
/* host reader */
gchar *
gst_apexraop_get_host (GstApExRAOP * con)
{
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
return g_strdup (conn->host);
}
/* control port affectation */
void
gst_apexraop_set_port (GstApExRAOP * con, const guint16 port)
{
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
conn->ctrl_port = port;
}
/* control port reader */
guint16
gst_apexraop_get_port (GstApExRAOP * con)
{
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
return conn->ctrl_port;
}
/* user agent affectation */
void
gst_apexraop_set_useragent (GstApExRAOP * con, const gchar * useragent)
{
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
g_free (conn->ua);
conn->ua = g_strdup (useragent);
}
/* user agent reader */
gchar *
gst_apexraop_get_useragent (GstApExRAOP * con)
{
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
return g_strdup (conn->ua);
}
/* raop apex connection sequence */
GstRTSPStatusCode
gst_apexraop_connect (GstApExRAOP * con)
{
gchar *ac, *ky, *iv, *s, inaddr[INET_ADDRSTRLEN],
creq[GST_APEX_RAOP_SDP_DEFAULT_LENGTH],
hreq[GST_APEX_RAOP_HDR_DEFAULT_LENGTH], *req;
RSA *rsa;
guchar *mod, *exp, rsakey[512];
union gst_randbytes
{
struct asvals
{
gulong url_key;
guint64 conn_id;
guchar challenge[16];
} v;
guchar buf[4 + 8 + 16];
} randbuf;
gsize size;
struct sockaddr_in ioaddr;
socklen_t iolen;
GstRTSPStatusCode res;
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
if ((conn->ctrl_sd = socket (AF_INET, SOCK_STREAM, 0)) < 0)
return GST_RTSP_STS_DESTINATION_UNREACHABLE;
conn->ctrl_sd_in.sin_family = AF_INET;
conn->ctrl_sd_in.sin_port = htons (conn->ctrl_port);
if (!inet_aton (conn->host, &conn->ctrl_sd_in.sin_addr)) {
struct hostent *hp = (struct hostent *) gethostbyname (conn->host);
if (hp == NULL)
return GST_RTSP_STS_DESTINATION_UNREACHABLE;
memcpy (&conn->ctrl_sd_in.sin_addr, hp->h_addr, hp->h_length);
}
if (connect (conn->ctrl_sd, (struct sockaddr *) &conn->ctrl_sd_in,
sizeof (conn->ctrl_sd_in)) < 0)
return GST_RTSP_STS_DESTINATION_UNREACHABLE;
RAND_bytes (randbuf.buf, sizeof (randbuf));
sprintf ((gchar *) conn->url_abspath, "%lu", randbuf.v.url_key);
sprintf ((char *) conn->cid, "%16" G_GINT64_MODIFIER "x", randbuf.v.conn_id);
RAND_bytes (conn->aes_ky, AES_BLOCK_SIZE);
RAND_bytes (conn->aes_iv, AES_BLOCK_SIZE);
rsa = RSA_new ();
mod = g_base64_decode (GST_APEX_RAOP_RSA_PUBLIC_MOD, &size);
rsa->n = BN_bin2bn (mod, size, NULL);
exp = g_base64_decode (GST_APEX_RAOP_RSA_PUBLIC_EXP, &size);
rsa->e = BN_bin2bn (exp, size, NULL);
size =
RSA_public_encrypt (AES_BLOCK_SIZE, conn->aes_ky, rsakey, rsa,
RSA_PKCS1_OAEP_PADDING);
ky = g_base64_encode (rsakey, size);
iv = g_base64_encode (conn->aes_iv, AES_BLOCK_SIZE);
g_strdel (ky, '=');
g_strdel (iv, '=');
iolen = sizeof (struct sockaddr);
getsockname (conn->ctrl_sd, (struct sockaddr *) &ioaddr, &iolen);
inet_ntop (AF_INET, &(ioaddr.sin_addr), inaddr, INET_ADDRSTRLEN);
ac = g_base64_encode (randbuf.v.challenge, 16);
g_strdel (ac, '=');
sprintf (creq,
"v=0\r\n"
"o=iTunes %s 0 IN IP4 %s\r\n"
"s=iTunes\r\n"
"c=IN IP4 %s\r\n"
"t=0 0\r\n"
"m=audio 0 RTP/AVP 96\r\n"
"a=rtpmap:96 AppleLossless\r\n"
"a=fmtp:96 %d 0 %d 40 10 14 %d 255 0 0 %d\r\n"
"a=rsaaeskey:%s\r\n"
"a=aesiv:%s\r\n",
conn->url_abspath,
inaddr,
conn->host,
GST_APEX_RAOP_SAMPLES_PER_FRAME,
GST_APEX_RAOP_BYTES_PER_CHANNEL * 8,
GST_APEX_RAOP_CHANNELS, GST_APEX_RAOP_BITRATE, ky, iv);
sprintf (hreq,
"ANNOUNCE rtsp://%s/%s RTSP/1.0\r\n"
"CSeq: %d\r\n"
"Client-Instance: %s\r\n"
"User-Agent: %s\r\n"
"Content-Type: application/sdp\r\n"
"Content-Length: %u\r\n"
"Apple-Challenge: %s\r\n",
conn->host,
conn->url_abspath, ++conn->cseq, conn->cid, conn->ua,
(guint) strlen (creq), ac);
RSA_free (rsa);
g_free (ky);
g_free (iv);
g_free (ac);
g_free (mod);
g_free (exp);
req = g_strconcat (hreq, "\r\n", creq, NULL);
if (gst_apexraop_send (conn->ctrl_sd, req, strlen (req)) <= 0) {
g_free (req);
return GST_RTSP_STS_GONE;
}
g_free (req);
if (gst_apexraop_recv (conn->ctrl_sd, hreq,
GST_APEX_RAOP_HDR_DEFAULT_LENGTH) <= 0)
return GST_RTSP_STS_GONE;
sscanf (hreq, "%*s %d", (int *) &res);
if (res != GST_RTSP_STS_OK)
return res;
s = g_strrstr (hreq, "Audio-Jack-Status");
if (s != NULL) {
gchar status[128];
sscanf (s, "%*s %s", status);
if (strcmp (status, "connected;") == 0)
conn->jack_status = GST_APEX_JACK_STATUS_CONNECTED;
else if (strcmp (status, "disconnected;") == 0)
conn->jack_status = GST_APEX_JACK_STATUS_DISCONNECTED;
else
conn->jack_status = GST_APEX_JACK_STATUS_UNDEFINED;
s = g_strrstr (s, "type=");
if (s != NULL) {
strtok (s, "=");
s = strtok (NULL, "\n");
if (strcmp (s, "analog"))
conn->jack_type = GST_APEX_JACK_TYPE_ANALOG;
else if (strcmp (s, "digital"))
conn->jack_type = GST_APEX_JACK_TYPE_DIGITAL;
else
conn->jack_type = GST_APEX_JACK_TYPE_UNDEFINED;
}
}
sprintf (hreq,
"SETUP rtsp://%s/%s RTSP/1.0\r\n"
"CSeq: %d\r\n"
"Client-Instance: %s\r\n"
"User-Agent: %s\r\n"
"Transport: RTP/AVP/TCP;unicast;interleaved=0-1;mode=record\r\n"
"\r\n", conn->host, conn->url_abspath, ++conn->cseq, conn->cid, conn->ua);
if (gst_apexraop_send (conn->ctrl_sd, hreq, strlen (hreq)) <= 0)
return GST_RTSP_STS_GONE;
if (gst_apexraop_recv (conn->ctrl_sd, hreq,
GST_APEX_RAOP_HDR_DEFAULT_LENGTH) <= 0)
return GST_RTSP_STS_GONE;
sscanf (hreq, "%*s %d", (int *) &res);
if (res != GST_RTSP_STS_OK)
return res;
s = g_strrstr (hreq, "Session");
if (s != NULL) {
gchar session[128];
sscanf (s, "%*s %s", session);
conn->session = g_strdup (session);
} else
return GST_RTSP_STS_PRECONDITION_FAILED;
s = g_strrstr (hreq, "server_port");
if (s != NULL) {
sscanf (s, "server_port=%d", &conn->data_port);
} else
return GST_RTSP_STS_PRECONDITION_FAILED;
sprintf (hreq,
"RECORD rtsp://%s/%s RTSP/1.0\r\n"
"CSeq: %d\r\n"
"Client-Instance: %s\r\n"
"User-Agent: %s\r\n"
"Session: %s\r\n"
"Range: npt=0-\r\n"
"RTP-Info: seq=0;rtptime=0\r\n"
"\r\n",
conn->host,
conn->url_abspath, ++conn->cseq, conn->cid, conn->ua, conn->session);
if (gst_apexraop_send (conn->ctrl_sd, hreq, strlen (hreq)) <= 0)
return GST_RTSP_STS_GONE;
if (gst_apexraop_recv (conn->ctrl_sd, hreq,
GST_APEX_RAOP_HDR_DEFAULT_LENGTH) <= 0)
return GST_RTSP_STS_GONE;
sscanf (hreq, "%*s %d", (int *) &res);
if (res != GST_RTSP_STS_OK)
return res;
if ((conn->data_sd = socket (AF_INET, SOCK_STREAM, 0)) < 0)
return GST_RTSP_STS_DESTINATION_UNREACHABLE;
conn->data_sd_in.sin_family = AF_INET;
conn->data_sd_in.sin_port = htons (conn->data_port);
memcpy (&conn->data_sd_in.sin_addr, &conn->ctrl_sd_in.sin_addr,
sizeof (conn->ctrl_sd_in.sin_addr));
if (connect (conn->data_sd, (struct sockaddr *) &conn->data_sd_in,
sizeof (conn->data_sd_in)) < 0)
return GST_RTSP_STS_DESTINATION_UNREACHABLE;
return res;
}
/* raop apex jack type access */
GstApExJackType
gst_apexraop_get_jacktype (GstApExRAOP * con)
{
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
if (!conn)
return GST_APEX_JACK_TYPE_UNDEFINED;
return conn->jack_type;
}
/* raop apex jack status access */
GstApExJackStatus
gst_apexraop_get_jackstatus (GstApExRAOP * con)
{
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
if (!conn)
return GST_APEX_JACK_STATUS_UNDEFINED;
return conn->jack_status;
}
/* raop apex sockets close */
void
gst_apexraop_close (GstApExRAOP * con)
{
gchar hreq[GST_APEX_RAOP_HDR_DEFAULT_LENGTH];
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
sprintf (hreq,
"TEARDOWN rtsp://%s/%s RTSP/1.0\r\n"
"CSeq: %d\r\n"
"Client-Instance: %s\r\n"
"User-Agent: %s\r\n"
"Session: %s\r\n"
"\r\n",
conn->host,
conn->url_abspath, ++conn->cseq, conn->cid, conn->ua, conn->session);
gst_apexraop_send (conn->ctrl_sd, hreq, strlen (hreq));
gst_apexraop_recv (conn->ctrl_sd, hreq, GST_APEX_RAOP_HDR_DEFAULT_LENGTH);
if (conn->ctrl_sd != 0)
close (conn->ctrl_sd);
if (conn->data_sd != 0)
close (conn->data_sd);
}
/* raop apex volume set */
GstRTSPStatusCode
gst_apexraop_set_volume (GstApExRAOP * con, const guint volume)
{
gint v;
gchar creq[GST_APEX_RAOP_SDP_DEFAULT_LENGTH],
hreq[GST_APEX_RAOP_HDR_DEFAULT_LENGTH], *req, vol[128];
GstRTSPStatusCode res;
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
v = GST_APEX_RAOP_VOLUME_MIN + (GST_APEX_RAOP_VOLUME_MAX -
GST_APEX_RAOP_VOLUME_MIN) * volume / 100.;
sprintf (vol, "volume: %d.000000\r\n", v);
sprintf (creq, "%s\r\n", vol);
sprintf (hreq,
"SET_PARAMETER rtsp://%s/%s RTSP/1.0\r\n"
"CSeq: %d\r\n"
"Client-Instance: %s\r\n"
"User-Agent: %s\r\n"
"Session: %s\r\n"
"Content-Type: text/parameters\r\n"
"Content-Length: %u\r\n",
conn->host,
conn->url_abspath,
++conn->cseq, conn->cid, conn->ua, conn->session, (guint) strlen (creq)
);
req = g_strconcat (hreq, "\r\n", creq, NULL);
if (gst_apexraop_send (conn->ctrl_sd, req, strlen (req)) <= 0) {
g_free (req);
return GST_RTSP_STS_GONE;
}
g_free (req);
if (gst_apexraop_recv (conn->ctrl_sd, hreq,
GST_APEX_RAOP_HDR_DEFAULT_LENGTH) <= 0)
return GST_RTSP_STS_GONE;
sscanf (hreq, "%*s %d", (int *) &res);
return res;
}
/* raop apex raw data alac encapsulation, encryption and emission, http://wiki.multimedia.cx/index.php?title=Apple_Lossless_Audio_Coding */
static void inline
gst_apexraop_write_bits (guchar * buffer, int data, int numbits,
int *bit_offset, int *byte_offset)
{
const static guchar masks[] =
{ 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF };
if (((*bit_offset) != 0) && (((*bit_offset) + numbits) > 8)) {
gint numwritebits;
guchar bitstowrite;
numwritebits = 8 - (*bit_offset);
bitstowrite =
(guchar) ((data >> (numbits - numwritebits)) << (8 - (*bit_offset) -
numwritebits));
buffer[(*byte_offset)] |= bitstowrite;
numbits -= numwritebits;
(*bit_offset) = 0;
(*byte_offset)++;
}
while (numbits >= 8) {
guchar bitstowrite;
bitstowrite = (guchar) ((data >> (numbits - 8)) & 0xFF);
buffer[(*byte_offset)] |= bitstowrite;
numbits -= 8;
(*bit_offset) = 0;
(*byte_offset)++;
}
if (numbits > 0) {
guchar bitstowrite;
bitstowrite =
(guchar) ((data & masks[numbits]) << (8 - (*bit_offset) - numbits));
buffer[(*byte_offset)] |= bitstowrite;
(*bit_offset) += numbits;
if ((*bit_offset) == 8) {
(*byte_offset)++;
(*bit_offset) = 0;
}
}
}
guint
gst_apexraop_write (GstApExRAOP * con, gpointer rawdata, guint length)
{
guchar *buffer, *frame_data;
gushort len;
gint bit_offset, byte_offset, i, out_len, res;
EVP_CIPHER_CTX aes_ctx;
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
buffer =
(guchar *) g_malloc0 (GST_APEX_RAOP_FRAME_HEADER_SIZE +
GST_APEX_RAOP_ALAC_HEADER_SIZE + length);
memcpy (buffer, GST_APEX_RAOP_FRAME_HEADER, GST_APEX_RAOP_FRAME_HEADER_SIZE);
len =
length + GST_APEX_RAOP_FRAME_HEADER_SIZE +
GST_APEX_RAOP_ALAC_HEADER_SIZE - 4;
buffer[2] = len >> 8;
buffer[3] = len & 0xff;
bit_offset = 0;
byte_offset = 0;
frame_data = buffer + GST_APEX_RAOP_FRAME_HEADER_SIZE;
gst_apexraop_write_bits (frame_data, 1, 3, &bit_offset, &byte_offset); /* channels, 0 mono, 1 stereo */
gst_apexraop_write_bits (frame_data, 0, 4, &bit_offset, &byte_offset); /* unknown */
gst_apexraop_write_bits (frame_data, 0, 8, &bit_offset, &byte_offset); /* unknown (12 bits) */
gst_apexraop_write_bits (frame_data, 0, 4, &bit_offset, &byte_offset);
gst_apexraop_write_bits (frame_data, 0, 1, &bit_offset, &byte_offset); /* has size flag */
gst_apexraop_write_bits (frame_data, 0, 2, &bit_offset, &byte_offset); /* unknown */
gst_apexraop_write_bits (frame_data, 1, 1, &bit_offset, &byte_offset); /* no compression flag */
for (i = 0; i < length; i += 2) {
gst_apexraop_write_bits (frame_data, ((guchar *) rawdata)[i + 1], 8,
&bit_offset, &byte_offset);
gst_apexraop_write_bits (frame_data, ((guchar *) rawdata)[i], 8,
&bit_offset, &byte_offset);
}
EVP_CIPHER_CTX_init (&aes_ctx);
EVP_CipherInit_ex (&aes_ctx, EVP_aes_128_cbc (), NULL, conn->aes_ky,
conn->aes_iv, AES_ENCRYPT);
EVP_CipherUpdate (&aes_ctx, frame_data, &out_len, frame_data, /*( */
GST_APEX_RAOP_ALAC_HEADER_SIZE +
length /*) / AES_BLOCK_SIZE * AES_BLOCK_SIZE */ );
EVP_CIPHER_CTX_cleanup (&aes_ctx);
res =
gst_apexraop_send (conn->data_sd, buffer,
GST_APEX_RAOP_FRAME_HEADER_SIZE + GST_APEX_RAOP_ALAC_HEADER_SIZE +
length);
g_free (buffer);
return (guint) ((res >=
(GST_APEX_RAOP_FRAME_HEADER_SIZE +
GST_APEX_RAOP_ALAC_HEADER_SIZE)) ? (res -
GST_APEX_RAOP_FRAME_HEADER_SIZE -
GST_APEX_RAOP_ALAC_HEADER_SIZE) : 0);
}
/* raop apex buffer flush */
GstRTSPStatusCode
gst_apexraop_flush (GstApExRAOP * con)
{
gchar hreq[GST_APEX_RAOP_HDR_DEFAULT_LENGTH];
GstRTSPStatusCode res;
_GstApExRAOP *conn;
conn = (_GstApExRAOP *) con;
sprintf (hreq,
"FLUSH rtsp://%s/%s RTSP/1.0\r\n"
"CSeq: %d\r\n"
"Client-Instance: %s\r\n"
"User-Agent: %s\r\n"
"Session: %s\r\n"
"RTP-Info: seq=0;rtptime=0\r\n"
"\r\n",
conn->host,
conn->url_abspath, ++conn->cseq, conn->cid, conn->ua, conn->session);
if (gst_apexraop_send (conn->ctrl_sd, hreq, strlen (hreq)) <= 0)
return GST_RTSP_STS_GONE;
if (gst_apexraop_recv (conn->ctrl_sd, hreq,
GST_APEX_RAOP_HDR_DEFAULT_LENGTH) <= 0)
return GST_RTSP_STS_GONE;
sscanf (hreq, "%*s %d", (int *) &res);
return res;
}