/* 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 <string.h> #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[] = { // Used by gen. 1 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; // Used by gen. 1 const static int GST_APEX_RTP_FRAME_HEADER_SIZE = 12; // Used by gen. 2 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) { memset (data, 0, 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 */ GstApExGeneration generation; /* Different devices accept different audio streams */ GstApExTransportProtocol transport_protocol; /* For media stream, not RAOP/RTSP */ 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; short rtp_seq_num; /* RTP sequence number, used by gen. 2 */ int rtp_timestamp; /* RTP timestamp, used by gen. 2 */ } _GstApExRAOP; /* raop apex struct allocation */ GstApExRAOP * gst_apexraop_new (const gchar * host, const guint16 port, const GstApExGeneration generation, const GstApExTransportProtocol transport_protocol) { _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; apexraop->generation = generation; apexraop->transport_protocol = transport_protocol; apexraop->rtp_seq_num = 0; apexraop->rtp_timestamp = 0; 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, conn->generation == GST_APEX_GENERATION_ONE ? GST_APEX_RAOP_V1_SAMPLES_PER_FRAME : GST_APEX_RAOP_V2_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; { int tmp; sscanf (hreq, "%*s %d", &tmp); res = (GstRTSPStatusCode) tmp; } 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; { int tmp; sscanf (hreq, "%*s %d", &tmp); res = (GstRTSPStatusCode) tmp; } 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; { int tmp; sscanf (hreq, "%*s %d", &tmp); res = (GstRTSPStatusCode) tmp; } if (res != GST_RTSP_STS_OK) return res; if (conn->transport_protocol == GST_APEX_TCP) { if ((conn->data_sd = socket (AF_INET, SOCK_STREAM, 0)) < 0) return GST_RTSP_STS_DESTINATION_UNREACHABLE; } else if (conn->transport_protocol == GST_APEX_UDP) { if ((conn->data_sd = socket (AF_INET, SOCK_DGRAM, 0)) < 0) return GST_RTSP_STS_DESTINATION_UNREACHABLE; } else return GST_RTSP_STS_METHOD_NOT_ALLOWED; 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 generation access */ GstApExGeneration gst_apexraop_get_generation (GstApExRAOP * con) { _GstApExRAOP *conn; conn = (_GstApExRAOP *) con; if (!conn) return GST_APEX_GENERATION_ONE; return conn->generation; } /* raop apex transport protocol access */ GstApExTransportProtocol gst_apexraop_get_transport_protocol (GstApExRAOP * con) { _GstApExRAOP *conn; conn = (_GstApExRAOP *) con; if (!conn) return GST_APEX_TCP; return conn->transport_protocol; } /* 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; { int tmp; sscanf (hreq, "%*s %d", &tmp); res = (GstRTSPStatusCode) tmp; } 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 = (_GstApExRAOP *) con; const int frame_header_size = conn->generation == GST_APEX_GENERATION_ONE ? GST_APEX_RAOP_FRAME_HEADER_SIZE : GST_APEX_RTP_FRAME_HEADER_SIZE; buffer = (guchar *) g_malloc0 (frame_header_size + GST_APEX_RAOP_ALAC_HEADER_SIZE + length); if (conn->generation == GST_APEX_GENERATION_ONE) { g_assert (frame_header_size == GST_APEX_RAOP_FRAME_HEADER_SIZE); memcpy (buffer, GST_APEX_RAOP_FRAME_HEADER, frame_header_size); len = length + frame_header_size + GST_APEX_RAOP_ALAC_HEADER_SIZE - 4; buffer[2] = len >> 8; buffer[3] = len & 0xff; } else { /* Gen. 2 uses RTP-like header (RFC 3550). */ short network_seq_num; int network_timestamp, unknown_const; static gboolean first = TRUE; buffer[0] = 0x80; if (first) { buffer[1] = 0xe0; first = FALSE; } else buffer[1] = 0x60; network_seq_num = htons (conn->rtp_seq_num++); memcpy (buffer + 2, &network_seq_num, 2); network_timestamp = htons (conn->rtp_timestamp); memcpy (buffer + 4, &network_timestamp, 4); conn->rtp_timestamp += GST_APEX_RAOP_V2_SAMPLES_PER_FRAME; unknown_const = 0xdeadbeef; memcpy (buffer + 8, &unknown_const, 4); } bit_offset = 0; byte_offset = 0; frame_data = buffer + 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, frame_header_size + GST_APEX_RAOP_ALAC_HEADER_SIZE + length); g_free (buffer); return (guint) ((res >= (frame_header_size + GST_APEX_RAOP_ALAC_HEADER_SIZE)) ? (res - 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=%d;rtptime=%d\r\n" "\r\n", conn->host, conn->url_abspath, ++conn->cseq, conn->cid, conn->ua, conn->session, conn->rtp_seq_num, conn->rtp_timestamp); 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; { int tmp; sscanf (hreq, "%*s %d", &tmp); res = (GstRTSPStatusCode) tmp; } return res; }