1 /*****************************************************************************
2 * raop.c: Remote Audio Output Protocol streaming support
3 *****************************************************************************
4 * Copyright (C) 2008 the VideoLAN team
7 * Author: Michael Hanselmann
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
35 #include <vlc_common.h>
36 #include <vlc_plugin.h>
38 #include <vlc_block.h>
39 #include <vlc_network.h>
40 #include <vlc_strings.h>
41 #include <vlc_charset.h>
42 #include <vlc_gcrypt.h>
45 #define RAOP_PORT 5000
46 #define RAOP_USER_AGENT "VLC " VERSION
49 static const char ps_raop_rsa_pubkey[] =
50 "\xe7\xd7\x44\xf2\xa2\xe2\x78\x8b\x6c\x1f\x55\xa0\x8e\xb7\x05\x44"
51 "\xa8\xfa\x79\x45\xaa\x8b\xe6\xc6\x2c\xe5\xf5\x1c\xbd\xd4\xdc\x68"
52 "\x42\xfe\x3d\x10\x83\xdd\x2e\xde\xc1\xbf\xd4\x25\x2d\xc0\x2e\x6f"
53 "\x39\x8b\xdf\x0e\x61\x48\xea\x84\x85\x5e\x2e\x44\x2d\xa6\xd6\x26"
54 "\x64\xf6\x74\xa1\xf3\x04\x92\x9a\xde\x4f\x68\x93\xef\x2d\xf6\xe7"
55 "\x11\xa8\xc7\x7a\x0d\x91\xc9\xd9\x80\x82\x2e\x50\xd1\x29\x22\xaf"
56 "\xea\x40\xea\x9f\x0e\x14\xc0\xf7\x69\x38\xc5\xf3\x88\x2f\xc0\x32"
57 "\x3d\xd9\xfe\x55\x15\x5f\x51\xbb\x59\x21\xc2\x01\x62\x9f\xd7\x33"
58 "\x52\xd5\xe2\xef\xaa\xbf\x9b\xa0\x48\xd7\xb8\x13\xa2\xb6\x76\x7f"
59 "\x6c\x3c\xcf\x1e\xb4\xce\x67\x3d\x03\x7b\x0d\x2e\xa3\x0c\x5f\xff"
60 "\xeb\x06\xf8\xd0\x8a\xdd\xe4\x09\x57\x1a\x9c\x68\x9f\xef\x10\x72"
61 "\x88\x55\xdd\x8c\xfb\x9a\x8b\xef\x5c\x89\x43\xef\x3b\x5f\xaa\x15"
62 "\xdd\xe6\x98\xbe\xdd\xf3\x59\x96\x03\xeb\x3e\x6f\x61\x37\x2b\xb6"
63 "\x28\xf6\x55\x9f\x59\x9a\x78\xbf\x50\x06\x87\xaa\x7f\x49\x76\xc0"
64 "\x56\x2d\x41\x29\x56\xf8\x98\x9e\x18\xa6\x35\x5b\xd8\x15\x97\x82"
65 "\x5e\x0f\xc8\x75\x34\x3e\xc7\x82\x11\x76\x25\xcd\xbf\x98\x44\x7b";
67 static const char ps_raop_rsa_exp[] = "\x01\x00\x01";
69 static const char psz_delim_space[] = " ";
70 static const char psz_delim_colon[] = ":";
71 static const char psz_delim_equal[] = "=";
72 static const char psz_delim_semicolon[] = ";";
75 /*****************************************************************************
77 *****************************************************************************/
78 static int Open( vlc_object_t * );
79 static void Close( vlc_object_t * );
81 static sout_stream_id_t *Add( sout_stream_t *, es_format_t * );
82 static int Del( sout_stream_t *, sout_stream_id_t * );
83 static int Send( sout_stream_t *, sout_stream_id_t *, block_t* );
85 static int VolumeCallback( vlc_object_t *p_this, char const *psz_cmd,
86 vlc_value_t oldval, vlc_value_t newval,
96 struct sout_stream_sys_t
98 /* Input parameters */
103 sout_stream_id_t *p_audio_stream;
105 bool b_volume_callback;
107 /* Connection state */
111 uint8_t ps_aes_key[16];
112 uint8_t ps_aes_iv[16];
113 gcry_cipher_hd_t aes_ctx;
116 char *psz_client_instance;
118 char *psz_last_status_line;
126 size_t i_sendbuf_len;
130 struct sout_stream_id_t
136 /*****************************************************************************
138 *****************************************************************************/
139 #define SOUT_CFG_PREFIX "sout-raop-"
141 #define HOST_TEXT N_("Host")
142 #define HOST_LONGTEXT N_("Hostname or IP address of target device")
144 #define VOLUME_TEXT N_("Volume")
145 #define VOLUME_LONGTEXT N_("Output volume for analog output: 0 for silence, " \
146 "1..255 from almost silent to very loud.")
149 set_shortname( N_("RAOP") )
150 set_description( N_("Remote Audio Output Protocol stream output") )
151 set_capability( "sout stream", 0 )
152 add_shortcut( "raop" )
153 set_category( CAT_SOUT )
154 set_subcategory( SUBCAT_SOUT_STREAM )
155 add_string( SOUT_CFG_PREFIX "host", "", NULL,
156 HOST_TEXT, HOST_LONGTEXT, false )
157 add_integer_with_range( SOUT_CFG_PREFIX "volume", 100, 0, 255, NULL,
158 VOLUME_TEXT, VOLUME_LONGTEXT, false )
159 set_callbacks( Open, Close )
162 static const char *const ppsz_sout_options[] = {
169 /*****************************************************************************
171 *****************************************************************************/
172 static void FreeSys( vlc_object_t *p_this, sout_stream_sys_t *p_sys )
174 sout_stream_t *p_stream = (sout_stream_t*)p_this;
176 if ( p_sys->i_control_fd >= 0 )
177 net_Close( p_sys->i_control_fd );
178 if ( p_sys->i_stream_fd >= 0 )
179 net_Close( p_sys->i_stream_fd );
180 if ( p_sys->b_volume_callback )
181 var_DelCallback( p_stream, SOUT_CFG_PREFIX "volume",
182 VolumeCallback, NULL );
184 gcry_cipher_close( p_sys->aes_ctx );
186 free( p_sys->p_sendbuf );
187 free( p_sys->psz_host );
188 free( p_sys->psz_url );
189 free( p_sys->psz_session );
190 free( p_sys->psz_client_instance );
191 free( p_sys->psz_last_status_line );
195 static void FreeId( sout_stream_id_t *id )
200 static void RemoveBase64Padding( char *str )
202 char *ps_pos = strchr( str, '=' );
203 if ( ps_pos != NULL )
207 static int CheckForGcryptErrorWithLine( sout_stream_t *p_stream,
208 gcry_error_t i_gcrypt_err,
209 unsigned int i_line )
211 if ( i_gcrypt_err != GPG_ERR_NO_ERROR )
213 msg_Err( p_stream, "gcrypt error (line %d): %s", i_line,
214 gpg_strerror( i_gcrypt_err ) );
221 /* Wrapper to pass line number for easier debugging */
222 #define CheckForGcryptError( p_this, i_gcrypt_err ) \
223 CheckForGcryptErrorWithLine( p_this, i_gcrypt_err, __LINE__ )
225 /* MGF1 is specified in RFC2437, section 10.2.1. Variables are named after the
228 static int MGF1( vlc_object_t *p_this,
229 unsigned char *mask, size_t l,
230 const unsigned char *Z, const size_t zLen,
233 sout_stream_t *p_stream = (sout_stream_t*)p_this;
234 gcry_error_t i_gcrypt_err;
235 gcry_md_hd_t md_handle = NULL;
237 unsigned char *ps_md;
238 uint32_t counter = 0;
241 int i_err = VLC_SUCCESS;
243 assert( mask != NULL );
246 hLen = gcry_md_get_algo_dlen( Hash );
248 i_gcrypt_err = gcry_md_open( &md_handle, Hash, 0 );
249 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
251 i_err = VLC_EGENERIC;
257 /* 3. For counter from 0 to \lceil{l / hLen}\rceil-1, do the following:
258 * a. Convert counter to an octet string C of length 4 with the
259 * primitive I2OSP: C = I2OSP (counter, 4)
261 C[0] = (counter >> 24) & 0xff;
262 C[1] = (counter >> 16) & 0xff;
263 C[2] = (counter >> 8) & 0xff;
264 C[3] = counter & 0xff;
267 /* b. Concatenate the hash of the seed Z and C to the octet string T:
268 * T = T || Hash (Z || C)
270 gcry_md_reset( md_handle );
271 gcry_md_write( md_handle, Z, zLen );
272 gcry_md_write( md_handle, C, 4 );
273 ps_md = gcry_md_read( md_handle, Hash );
275 /* 4. Output the leading l octets of T as the octet string mask. */
276 i_copylen = __MIN( l, hLen );
277 memcpy( mask, ps_md, i_copylen );
283 gcry_md_close( md_handle );
288 /* EME-OAEP-ENCODE is specified in RFC2437, section 9.1.1.1. Variables are
289 * named after the specification.
291 static int AddOaepPadding( vlc_object_t *p_this,
292 unsigned char *EM, const size_t emLenWithPrefix,
293 const unsigned char *M, const size_t mLen,
294 const unsigned char *P, const size_t pLen )
296 const int Hash = GCRY_MD_SHA1;
297 const unsigned int hLen = gcry_md_get_algo_dlen( Hash );
298 unsigned char *seed = NULL;
299 unsigned char *DB = NULL;
300 unsigned char *dbMask = NULL;
301 unsigned char *seedMask = NULL;
305 int i_err = VLC_SUCCESS;
307 /* Space for 0x00 prefix in EM. */
308 emLen = emLenWithPrefix - 1;
311 * If ||M|| > emLen-2hLen-1 then output "message too long" and stop.
313 if ( mLen > (emLen - (2 * hLen) - 1) )
315 msg_Err( p_this , "Message too long" );
320 * Generate an octet string PS consisting of emLen-||M||-2hLen-1 zero
321 * octets. The length of PS may be 0.
323 psLen = emLen - mLen - (2 * hLen) - 1;
327 * Concatenate pHash, PS, the message M, and other padding to form a data
328 * block DB as: DB = pHash || PS || 01 || M
330 DB = calloc( 1, hLen + psLen + 1 + mLen );
331 dbMask = calloc( 1, emLen - hLen );
332 seedMask = calloc( 1, hLen );
334 if ( DB == NULL || dbMask == NULL || seedMask == NULL )
341 * Let pHash = Hash(P), an octet string of length hLen.
343 gcry_md_hash_buffer( Hash, DB, P, pLen );
346 * Generate an octet string PS consisting of emLen-||M||-2hLen-1 zero
347 * octets. The length of PS may be 0.
349 memset( DB + hLen, 0, psLen );
352 * Concatenate pHash, PS, the message M, and other padding to form a data
353 * block DB as: DB = pHash || PS || 01 || M
355 DB[hLen + psLen] = 0x01;
356 memcpy( DB + hLen + psLen + 1, M, mLen );
359 * Generate a random octet string seed of length hLen
361 seed = gcry_random_bytes( hLen, GCRY_STRONG_RANDOM );
369 * Let dbMask = MGF(seed, emLen-hLen).
371 i_err = MGF1( p_this, dbMask, emLen - hLen, seed, hLen, Hash );
372 if ( i_err != VLC_SUCCESS )
376 * Let maskedDB = DB \xor dbMask.
378 for ( i = 0; i < (emLen - hLen); ++i )
382 * Let seedMask = MGF(maskedDB, hLen).
384 i_err = MGF1( p_this, seedMask, hLen, DB, emLen - hLen, Hash );
385 if ( i_err != VLC_SUCCESS )
389 * Let maskedSeed = seed \xor seedMask.
391 for ( i = 0; i < hLen; ++i )
392 seed[i] ^= seedMask[i];
395 * Let EM = maskedSeed || maskedDB.
397 assert( (1 + hLen + (hLen + psLen + 1 + mLen)) == emLenWithPrefix );
399 memcpy( EM + 1, seed, hLen );
400 memcpy( EM + 1 + hLen, DB, hLen + psLen + 1 + mLen );
415 static int EncryptAesKeyBase64( vlc_object_t *p_this, char **result )
417 sout_stream_t *p_stream = (sout_stream_t*)p_this;
418 sout_stream_sys_t *p_sys = p_stream->p_sys;
419 gcry_error_t i_gcrypt_err;
420 gcry_sexp_t sexp_rsa_params = NULL;
421 gcry_sexp_t sexp_input = NULL;
422 gcry_sexp_t sexp_encrypted = NULL;
423 gcry_sexp_t sexp_token_a = NULL;
424 gcry_mpi_t mpi_pubkey = NULL;
425 gcry_mpi_t mpi_exp = NULL;
426 gcry_mpi_t mpi_input = NULL;
427 gcry_mpi_t mpi_output = NULL;
428 unsigned char ps_padded_key[256];
429 unsigned char *ps_value;
431 int i_err = VLC_SUCCESS;
433 /* Add RSA-OAES-SHA1 padding */
434 i_err = AddOaepPadding( p_this,
435 ps_padded_key, sizeof( ps_padded_key ),
436 p_sys->ps_aes_key, sizeof( p_sys->ps_aes_key ),
438 if ( i_err != VLC_SUCCESS )
441 /* Read public key */
442 i_gcrypt_err = gcry_mpi_scan( &mpi_pubkey, GCRYMPI_FMT_USG,
444 sizeof( ps_raop_rsa_pubkey ) - 1, NULL );
445 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
447 i_err = VLC_EGENERIC;
452 i_gcrypt_err = gcry_mpi_scan( &mpi_exp, GCRYMPI_FMT_USG, ps_raop_rsa_exp,
453 sizeof( ps_raop_rsa_exp ) - 1, NULL );
454 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
456 i_err = VLC_EGENERIC;
460 /* If the input data starts with a set bit (0x80), gcrypt thinks it's a
461 * signed integer and complains. Prefixing it with a zero byte (\0)
462 * works, but involves more work. Converting it to an MPI in our code is
465 i_gcrypt_err = gcry_mpi_scan( &mpi_input, GCRYMPI_FMT_USG,
466 ps_padded_key, sizeof( ps_padded_key ),
468 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
470 i_err = VLC_EGENERIC;
474 /* Build S-expression with RSA parameters */
475 i_gcrypt_err = gcry_sexp_build( &sexp_rsa_params, NULL,
476 "(public-key(rsa(n %m)(e %m)))",
477 mpi_pubkey, mpi_exp );
478 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
480 i_err = VLC_EGENERIC;
484 /* Build S-expression for data */
485 i_gcrypt_err = gcry_sexp_build( &sexp_input, NULL, "(data(value %m))",
487 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
489 i_err = VLC_EGENERIC;
494 i_gcrypt_err = gcry_pk_encrypt( &sexp_encrypted, sexp_input,
496 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
498 i_err = VLC_EGENERIC;
502 /* Extract encrypted data */
503 sexp_token_a = gcry_sexp_find_token( sexp_encrypted, "a", 0 );
506 msg_Err( p_this , "Token 'a' not found in result S-expression" );
507 i_err = VLC_EGENERIC;
511 mpi_output = gcry_sexp_nth_mpi( sexp_token_a, 1, GCRYMPI_FMT_USG );
514 msg_Err( p_this, "Unable to extract MPI from result" );
515 i_err = VLC_EGENERIC;
519 /* Copy encrypted data into char array */
520 i_gcrypt_err = gcry_mpi_aprint( GCRYMPI_FMT_USG, &ps_value, &i_value_size,
522 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
524 i_err = VLC_EGENERIC;
528 /* Encode in Base64 */
529 *result = vlc_b64_encode_binary( ps_value, i_value_size );
532 gcry_sexp_release( sexp_rsa_params );
533 gcry_sexp_release( sexp_input );
534 gcry_sexp_release( sexp_encrypted );
535 gcry_sexp_release( sexp_token_a );
536 gcry_mpi_release( mpi_pubkey );
537 gcry_mpi_release( mpi_exp );
538 gcry_mpi_release( mpi_input );
539 gcry_mpi_release( mpi_output );
544 /* Splits the value of a received header.
546 * Example: "Transport: RTP/AVP/TCP;unicast;mode=record;server_port=6000"
548 static int SplitHeader( char **ppsz_next, char **ppsz_name,
551 /* Find semicolon (separator between assignments) */
552 *ppsz_name = strsep( ppsz_next, psz_delim_semicolon );
556 *ppsz_name += strspn( *ppsz_name, psz_delim_space );
559 *ppsz_value = *ppsz_name;
560 strsep( ppsz_value, psz_delim_equal );
568 static void FreeHeader( void *p_value, void *p_data )
570 VLC_UNUSED( p_data );
574 static int ReadStatusLine( vlc_object_t *p_this )
576 sout_stream_t *p_stream = (sout_stream_t*)p_this;
577 sout_stream_sys_t *p_sys = p_stream->p_sys;
578 char *psz_line = NULL;
581 int i_err = VLC_SUCCESS;
583 p_sys->psz_last_status_line = net_Gets( p_this, p_sys->i_control_fd,
585 if ( !p_sys->psz_last_status_line )
587 i_err = VLC_EGENERIC;
591 /* Create working copy */
592 psz_line = strdup( p_sys->psz_last_status_line );
596 psz_token = strsep( &psz_next, psz_delim_space );
597 if ( !psz_token || strncmp( psz_token, "RTSP/1.", 7 ) != 0 )
599 msg_Err( p_this, "Unknown protocol (%s)",
600 p_sys->psz_last_status_line );
601 i_err = VLC_EGENERIC;
606 psz_token = strsep( &psz_next, psz_delim_space );
607 if ( !psz_token || strcmp( psz_token, "200" ) != 0 )
609 msg_Err( p_this, "Request failed (%s)",
610 p_sys->psz_last_status_line );
611 i_err = VLC_EGENERIC;
621 static int ReadHeader( vlc_object_t *p_this,
622 vlc_dictionary_t *p_resp_headers,
625 sout_stream_t *p_stream = (sout_stream_t*)p_this;
626 sout_stream_sys_t *p_sys = p_stream->p_sys;
627 char *psz_original = NULL;
628 char *psz_line = NULL;
633 int i_err = VLC_SUCCESS;
635 psz_line = net_Gets( p_this, p_sys->i_control_fd, NULL );
638 i_err = VLC_EGENERIC;
642 /* Empty line for response end */
643 if ( psz_line[0] == '\0' )
645 else if ( p_resp_headers )
647 psz_original = strdup( psz_line );
650 psz_token = strsep( &psz_next, psz_delim_colon );
651 if ( !psz_token || psz_next[0] != ' ' )
653 msg_Err( p_this, "Invalid header format (%s)", psz_original );
654 i_err = VLC_EGENERIC;
658 psz_name = psz_token;
659 psz_value = psz_next + 1;
661 vlc_dictionary_insert( p_resp_headers, psz_name, strdup( psz_value ) );
665 free( psz_original );
671 static int WriteAuxHeaders( vlc_object_t *p_this,
672 vlc_dictionary_t *p_req_headers )
674 sout_stream_t *p_stream = (sout_stream_t*)p_this;
675 sout_stream_sys_t *p_sys = p_stream->p_sys;
676 char **ppsz_keys = NULL;
679 int i_err = VLC_SUCCESS;
683 ppsz_keys = vlc_dictionary_all_keys( p_req_headers );
684 for ( i = 0; ppsz_keys[i]; ++i )
686 psz_key = ppsz_keys[i];
687 psz_value = vlc_dictionary_value_for_key( p_req_headers, psz_key );
689 i_rc = net_Printf( p_this, p_sys->i_control_fd, NULL,
690 "%s: %s\r\n", psz_key, psz_value );
693 i_err = VLC_EGENERIC;
699 for ( i = 0; ppsz_keys[i]; ++i )
700 free( ppsz_keys[i] );
706 static int SendRequest( vlc_object_t *p_this, const char *psz_method,
707 const char *psz_content_type, const char *psz_body,
708 vlc_dictionary_t *p_req_headers )
710 sout_stream_t *p_stream = (sout_stream_t*)p_this;
711 sout_stream_sys_t *p_sys = p_stream->p_sys;
712 const unsigned char psz_headers_end[] = "\r\n";
713 size_t i_body_length = 0;
714 int i_err = VLC_SUCCESS;
717 i_rc = net_Printf( p_this, p_sys->i_control_fd, NULL,
719 "User-Agent: " RAOP_USER_AGENT "\r\n"
720 "Client-Instance: %s\r\n"
722 psz_method, p_sys->psz_url,
723 p_sys->psz_client_instance,
727 i_err = VLC_EGENERIC;
731 if ( psz_content_type )
733 i_rc = net_Printf( p_this, p_sys->i_control_fd, NULL,
734 "Content-Type: %s\r\n", psz_content_type );
744 i_body_length = strlen( psz_body );
746 i_rc = net_Printf( p_this, p_sys->i_control_fd, NULL,
747 "Content-Length: %u\r\n",
748 (unsigned int)i_body_length );
758 i_err = WriteAuxHeaders( p_this, p_req_headers );
759 if ( i_err != VLC_SUCCESS )
763 i_rc = net_Write( p_this, p_sys->i_control_fd, NULL,
764 psz_headers_end, sizeof( psz_headers_end ) - 1 );
772 net_Write( p_this, p_sys->i_control_fd, NULL,
773 psz_body, i_body_length );
779 static int ExecRequest( vlc_object_t *p_this, const char *psz_method,
780 const char *psz_content_type, const char *psz_body,
781 vlc_dictionary_t *p_req_headers,
782 vlc_dictionary_t *p_resp_headers )
784 sout_stream_t *p_stream = (sout_stream_t*)p_this;
785 sout_stream_sys_t *p_sys = p_stream->p_sys;
787 int i_err = VLC_SUCCESS;
789 if ( p_sys->i_control_fd < 0 )
791 msg_Err( p_this, "Control connection not open" );
792 i_err = VLC_EGENERIC;
797 i_err = SendRequest( p_this, psz_method, psz_content_type, psz_body,
799 if ( i_err != VLC_SUCCESS )
802 /* Read status line */
803 i_err = ReadStatusLine( p_this );
804 if ( i_err != VLC_SUCCESS )
807 if ( p_resp_headers )
808 vlc_dictionary_clear( p_resp_headers, FreeHeader, NULL );
812 while ( !headers_done )
814 i_err = ReadHeader( p_this, p_resp_headers, &headers_done );
815 if ( i_err != VLC_SUCCESS )
820 FREENULL( p_sys->psz_last_status_line );
825 static int AnnounceSDP( vlc_object_t *p_this, char *psz_local,
826 uint32_t i_session_id )
828 sout_stream_t *p_stream = (sout_stream_t*)p_this;
829 sout_stream_sys_t *p_sys = p_stream->p_sys;
830 vlc_dictionary_t req_headers;
831 vlc_dictionary_t resp_headers;
832 unsigned char ps_sac[16];
833 char *psz_sdp = NULL;
834 char *psz_sac_base64 = NULL;
835 char *psz_aes_key_base64 = NULL;
836 char *psz_aes_iv_base64 = NULL;
837 int i_err = VLC_SUCCESS;
840 vlc_dictionary_init( &req_headers, 0 );
841 vlc_dictionary_init( &resp_headers, 0 );
843 /* Encrypt AES key and encode it in Base64 */
844 i_rc = EncryptAesKeyBase64( p_this, &psz_aes_key_base64 );
845 if ( i_rc != VLC_SUCCESS || psz_aes_key_base64 == NULL )
847 i_err = VLC_EGENERIC;
850 RemoveBase64Padding( psz_aes_key_base64 );
852 /* Encode AES IV in Base64 */
853 psz_aes_iv_base64 = vlc_b64_encode_binary( p_sys->ps_aes_iv,
854 sizeof( p_sys->ps_aes_iv ) );
855 if ( psz_aes_iv_base64 == NULL )
857 i_err = VLC_EGENERIC;
860 RemoveBase64Padding( psz_aes_iv_base64 );
862 /* Random bytes for Apple-Challenge header */
863 gcry_randomize( ps_sac, sizeof( ps_sac ), GCRY_STRONG_RANDOM );
865 psz_sac_base64 = vlc_b64_encode_binary( ps_sac, sizeof( ps_sac ) );
866 if ( psz_sac_base64 == NULL )
868 i_err = VLC_EGENERIC;
871 RemoveBase64Padding( psz_sac_base64 );
874 * Note: IPv6 addresses also use "IP4". Make sure not to include the
877 i_rc = asprintf( &psz_sdp,
879 "o=iTunes %u 0 IN IP4 %s\r\n"
883 "m=audio 0 RTP/AVP 96\r\n"
884 "a=rtpmap:96 AppleLossless\r\n"
885 "a=fmtp:96 4096 0 16 40 10 14 2 255 0 0 44100\r\n"
888 i_session_id, psz_local, p_sys->psz_host,
889 psz_aes_key_base64, psz_aes_iv_base64 );
897 /* Build and send request */
898 vlc_dictionary_insert( &req_headers, "Apple-Challenge", psz_sac_base64 );
900 i_err = ExecRequest( p_this, "ANNOUNCE", "application/sdp", psz_sdp,
901 &req_headers, &resp_headers);
902 if ( i_err != VLC_SUCCESS )
906 vlc_dictionary_clear( &req_headers, NULL, NULL );
907 vlc_dictionary_clear( &resp_headers, FreeHeader, NULL );
910 free( psz_sac_base64 );
911 free( psz_aes_key_base64 );
912 free( psz_aes_iv_base64 );
917 static int SendSetup( vlc_object_t *p_this )
919 sout_stream_t *p_stream = (sout_stream_t*)p_this;
920 sout_stream_sys_t *p_sys = p_stream->p_sys;
921 vlc_dictionary_t req_headers;
922 vlc_dictionary_t resp_headers;
923 int i_err = VLC_SUCCESS;
929 vlc_dictionary_init( &req_headers, 0 );
930 vlc_dictionary_init( &resp_headers, 0 );
932 vlc_dictionary_insert( &req_headers, "Transport",
933 ((void*)"RTP/AVP/TCP;unicast;interleaved=0-1;"
936 i_err = ExecRequest( p_this, "SETUP", NULL, NULL,
937 &req_headers, &resp_headers );
938 if ( i_err != VLC_SUCCESS )
941 psz_tmp = vlc_dictionary_value_for_key( &resp_headers, "Session" );
944 msg_Err( p_this, "Missing 'Session' header during setup" );
945 i_err = VLC_EGENERIC;
949 free( p_sys->psz_session );
950 p_sys->psz_session = strdup( psz_tmp );
952 /* Get server_port */
953 psz_next = vlc_dictionary_value_for_key( &resp_headers, "Transport" );
954 while ( SplitHeader( &psz_next, &psz_name, &psz_value ) )
956 if ( psz_value && strcmp( psz_name, "server_port" ) == 0 )
958 p_sys->i_server_port = atoi( psz_value );
963 if ( !p_sys->i_server_port )
965 msg_Err( p_this, "Missing 'server_port' during setup" );
966 i_err = VLC_EGENERIC;
971 psz_next = vlc_dictionary_value_for_key( &resp_headers,
972 "Audio-Jack-Status" );
973 while ( SplitHeader( &psz_next, &psz_name, &psz_value ) )
975 if ( strcmp( psz_name, "type" ) != 0 )
978 if ( strcmp( psz_value, "analog" ) == 0 )
979 p_sys->i_jack_type = JACK_TYPE_ANALOG;
981 else if ( strcmp( psz_value, "digital" ) == 0 )
982 p_sys->i_jack_type = JACK_TYPE_DIGITAL;
988 vlc_dictionary_clear( &req_headers, NULL, NULL );
989 vlc_dictionary_clear( &resp_headers, FreeHeader, NULL );
994 static int SendRecord( vlc_object_t *p_this )
996 sout_stream_t *p_stream = (sout_stream_t*)p_this;
997 sout_stream_sys_t *p_sys = p_stream->p_sys;
998 vlc_dictionary_t req_headers;
999 vlc_dictionary_t resp_headers;
1000 int i_err = VLC_SUCCESS;
1003 vlc_dictionary_init( &req_headers, 0 );
1004 vlc_dictionary_init( &resp_headers, 0 );
1006 vlc_dictionary_insert( &req_headers, "Range", (void *)"npt=0-" );
1007 vlc_dictionary_insert( &req_headers, "RTP-Info",
1008 (void *)"seq=0;rtptime=0" );
1009 vlc_dictionary_insert( &req_headers, "Session",
1010 (void *)p_sys->psz_session );
1012 i_err = ExecRequest( p_this, "RECORD", NULL, NULL,
1013 &req_headers, &resp_headers );
1014 if ( i_err != VLC_SUCCESS )
1017 psz_value = vlc_dictionary_value_for_key( &resp_headers, "Audio-Latency" );
1019 p_sys->i_audio_latency = atoi( psz_value );
1021 p_sys->i_audio_latency = 0;
1024 vlc_dictionary_clear( &req_headers, NULL, NULL );
1025 vlc_dictionary_clear( &resp_headers, FreeHeader, NULL );
1030 static int SendFlush( vlc_object_t *p_this )
1032 VLC_UNUSED( p_this );
1034 vlc_dictionary_t req_headers;
1035 int i_err = VLC_SUCCESS;
1037 vlc_dictionary_init( &req_headers, 0 );
1039 vlc_dictionary_insert( &req_headers, "RTP-Info",
1040 (void *)"seq=0;rtptime=0" );
1042 i_err = ExecRequest( p_this, "FLUSH", NULL, NULL, &req_headers, NULL );
1043 if ( i_err != VLC_SUCCESS )
1047 vlc_dictionary_clear( &req_headers, NULL, NULL );
1052 static int SendTeardown( vlc_object_t *p_this )
1054 int i_err = VLC_SUCCESS;
1056 i_err = ExecRequest( p_this, "TEARDOWN", NULL, NULL, NULL, NULL );
1057 if ( i_err != VLC_SUCCESS )
1064 static int UpdateVolume( vlc_object_t *p_this )
1066 sout_stream_t *p_stream = (sout_stream_t*)p_this;
1067 sout_stream_sys_t *p_sys = p_stream->p_sys;
1068 vlc_dictionary_t req_headers;
1069 char *psz_parameters = NULL;
1071 int i_err = VLC_SUCCESS;
1074 vlc_dictionary_init( &req_headers, 0 );
1076 /* Our volume is 0..255, RAOP is -144..0 (-144 off, -30..0 on) */
1079 p_sys->i_volume = __MAX( 0, __MIN( p_sys->i_volume, 255 ) );
1081 if ( p_sys->i_volume == 0 )
1084 d_volume = -30 + ( ( (double)p_sys->i_volume ) * 30.0 / 255.0 );
1086 /* Format without using locales */
1087 i_rc = us_asprintf( &psz_parameters, "volume: %0.6f\r\n", d_volume );
1094 vlc_dictionary_insert( &req_headers, "Session",
1095 (void *)p_sys->psz_session );
1097 i_err = ExecRequest( p_this, "SET_PARAMETER",
1098 "text/parameters", psz_parameters,
1099 &req_headers, NULL );
1100 if ( i_err != VLC_SUCCESS )
1104 vlc_dictionary_clear( &req_headers, NULL, NULL );
1105 free( psz_parameters );
1110 static void LogInfo( vlc_object_t *p_this )
1112 sout_stream_t *p_stream = (sout_stream_t*)p_this;
1113 sout_stream_sys_t *p_sys = p_stream->p_sys;
1114 const char *psz_jack_name;
1116 msg_Info( p_this, "Audio latency: %d", p_sys->i_audio_latency );
1118 switch ( p_sys->i_jack_type )
1120 case JACK_TYPE_ANALOG:
1121 psz_jack_name = "analog";
1124 case JACK_TYPE_DIGITAL:
1125 psz_jack_name = "digital";
1128 case JACK_TYPE_NONE:
1130 psz_jack_name = "none";
1134 msg_Info( p_this, "Jack type: %s", psz_jack_name );
1137 static void SendAudio( sout_stream_t *p_stream, block_t *p_buffer )
1139 sout_stream_sys_t *p_sys = p_stream->p_sys;
1140 gcry_error_t i_gcrypt_err;
1143 size_t i_payload_len;
1144 size_t i_realloc_len;
1147 const uint8_t header[16] = {
1148 0x24, 0x00, 0x00, 0x00,
1149 0xf0, 0xff, 0x00, 0x00,
1150 0x00, 0x00, 0x00, 0x00,
1151 0x00, 0x00, 0x00, 0x00,
1156 i_len = sizeof( header ) + p_buffer->i_buffer;
1158 /* Buffer resize needed? */
1159 if ( i_len > p_sys->i_sendbuf_len || p_sys->p_sendbuf == NULL )
1161 /* Grow in blocks of 4K */
1162 i_realloc_len = (1 + (i_len / 4096)) * 4096;
1164 p_sys->p_sendbuf = realloc( p_sys->p_sendbuf, i_realloc_len );
1165 if ( p_sys->p_sendbuf == NULL )
1168 p_sys->i_sendbuf_len = i_realloc_len;
1172 memcpy( p_sys->p_sendbuf, header, sizeof( header ) );
1173 memcpy( p_sys->p_sendbuf + sizeof( header ),
1174 p_buffer->p_buffer, p_buffer->i_buffer );
1176 /* Calculate payload length and update header */
1177 i_payload_len = i_len - 4;
1178 if ( i_payload_len > 0xffff )
1180 msg_Err( p_stream, "Buffer is too long (%u bytes)",
1181 (unsigned int)i_payload_len );
1185 p_sys->p_sendbuf[2] = ( i_payload_len >> 8 ) & 0xff;
1186 p_sys->p_sendbuf[3] = i_payload_len & 0xff;
1189 i_gcrypt_err = gcry_cipher_reset( p_sys->aes_ctx );
1190 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
1194 i_gcrypt_err = gcry_cipher_setiv( p_sys->aes_ctx, p_sys->ps_aes_iv,
1195 sizeof( p_sys->ps_aes_iv ) );
1196 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
1199 /* Encrypt in place. Only full blocks of 16 bytes are encrypted,
1200 * the rest (0-15 bytes) is left unencrypted.
1203 gcry_cipher_encrypt( p_sys->aes_ctx,
1204 p_sys->p_sendbuf + sizeof( header ),
1205 ( p_buffer->i_buffer / 16 ) * 16,
1207 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
1211 rc = net_Write( p_stream, p_sys->i_stream_fd, NULL,
1212 p_sys->p_sendbuf, i_len );
1216 p_next = p_buffer->p_next;
1217 block_Release( p_buffer );
1222 block_ChainRelease( p_buffer );
1227 /*****************************************************************************
1229 *****************************************************************************/
1230 static int Open( vlc_object_t *p_this )
1232 sout_stream_t *p_stream = (sout_stream_t*)p_this;
1233 sout_stream_sys_t *p_sys;
1234 char psz_local[NI_MAXNUMERICHOST];
1235 gcry_error_t i_gcrypt_err;
1236 int i_err = VLC_SUCCESS;
1237 uint32_t i_session_id;
1238 uint64_t i_client_instance;
1242 config_ChainParse( p_stream, SOUT_CFG_PREFIX, ppsz_sout_options,
1245 p_sys = calloc( 1, sizeof( *p_sys ) );
1246 if ( p_sys == NULL )
1252 p_stream->p_sys = p_sys;
1253 p_stream->pf_add = Add;
1254 p_stream->pf_del = Del;
1255 p_stream->pf_send = Send;
1256 p_stream->p_sout->i_out_pace_nocontrol++;
1258 p_sys->i_control_fd = -1;
1259 p_sys->i_stream_fd = -1;
1260 p_sys->i_volume = var_GetInteger( p_stream, SOUT_CFG_PREFIX "volume");
1261 p_sys->i_jack_type = JACK_TYPE_NONE;
1263 p_sys->psz_host = var_GetNonEmptyString( p_stream,
1264 SOUT_CFG_PREFIX "host" );
1265 if ( p_sys->psz_host == NULL )
1267 msg_Err( p_this, "Missing host" );
1268 i_err = VLC_EGENERIC;
1272 var_AddCallback( p_stream, SOUT_CFG_PREFIX "volume",
1273 VolumeCallback, NULL );
1274 p_sys->b_volume_callback = true;
1276 /* Open control connection */
1277 p_sys->i_control_fd = net_ConnectTCP( p_stream, p_sys->psz_host,
1279 if ( p_sys->i_control_fd < 0 )
1281 msg_Err( p_this, "Cannot establish control connection to %s:%d (%m)",
1282 p_sys->psz_host, RAOP_PORT );
1283 i_err = VLC_EGENERIC;
1287 /* Get local IP address */
1288 if ( net_GetSockAddress( p_sys->i_control_fd, psz_local, NULL ) )
1290 msg_Err( p_this, "cannot get local IP address" );
1291 i_err = VLC_EGENERIC;
1295 /* Random session ID */
1296 gcry_randomize( &i_session_id, sizeof( i_session_id ),
1297 GCRY_STRONG_RANDOM );
1299 /* Random client instance */
1300 gcry_randomize( &i_client_instance, sizeof( i_client_instance ),
1301 GCRY_STRONG_RANDOM );
1302 if ( asprintf( &p_sys->psz_client_instance, "%016"PRIX64,
1303 i_client_instance ) < 0 )
1309 /* Build session URL */
1310 if ( asprintf( &p_sys->psz_url, "rtsp://%s/%u",
1311 psz_local, i_session_id ) < 0 )
1317 /* Generate AES key and IV */
1318 gcry_randomize( p_sys->ps_aes_key, sizeof( p_sys->ps_aes_key ),
1319 GCRY_STRONG_RANDOM );
1320 gcry_randomize( p_sys->ps_aes_iv, sizeof( p_sys->ps_aes_iv ),
1321 GCRY_STRONG_RANDOM );
1324 i_gcrypt_err = gcry_cipher_open( &p_sys->aes_ctx, GCRY_CIPHER_AES,
1325 GCRY_CIPHER_MODE_CBC, 0 );
1326 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
1328 i_err = VLC_EGENERIC;
1333 i_gcrypt_err = gcry_cipher_setkey( p_sys->aes_ctx, p_sys->ps_aes_key,
1334 sizeof( p_sys->ps_aes_key ) );
1335 if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
1337 i_err = VLC_EGENERIC;
1341 /* Protocol handshake */
1342 i_err = AnnounceSDP( p_this, psz_local, i_session_id );
1343 if ( i_err != VLC_SUCCESS )
1346 i_err = SendSetup( p_this );
1347 if ( i_err != VLC_SUCCESS )
1350 i_err = SendRecord( p_this );
1351 if ( i_err != VLC_SUCCESS )
1354 i_err = UpdateVolume( p_this );
1355 if ( i_err != VLC_SUCCESS )
1360 /* Open stream connection */
1361 p_sys->i_stream_fd = net_ConnectTCP( p_stream, p_sys->psz_host,
1362 p_sys->i_server_port );
1363 if ( p_sys->i_stream_fd < 0 )
1365 msg_Err( p_this, "Cannot establish stream connection to %s:%d (%m)",
1366 p_sys->psz_host, p_sys->i_server_port );
1367 i_err = VLC_EGENERIC;
1372 if ( i_err != VLC_SUCCESS )
1373 FreeSys( p_this, p_sys );
1379 /*****************************************************************************
1381 *****************************************************************************/
1382 static void Close( vlc_object_t *p_this )
1384 sout_stream_t *p_stream = (sout_stream_t*)p_this;
1385 sout_stream_sys_t *p_sys = p_stream->p_sys;
1387 SendFlush( p_this );
1388 SendTeardown( p_this );
1390 FreeSys( p_this, p_sys );
1392 p_stream->p_sout->i_out_pace_nocontrol--;
1396 /*****************************************************************************
1398 *****************************************************************************/
1399 static sout_stream_id_t *Add( sout_stream_t *p_stream, es_format_t *p_fmt )
1401 sout_stream_sys_t *p_sys = p_stream->p_sys;
1402 sout_stream_id_t *id = NULL;
1404 id = calloc( 1, sizeof( *id ) );
1408 es_format_Copy( &id->fmt, p_fmt );
1410 switch ( id->fmt.i_cat )
1413 if ( id->fmt.i_codec == VLC_CODEC_ALAC )
1415 if ( p_sys->p_audio_stream )
1417 msg_Warn( p_stream, "Only the first Apple Lossless audio "
1420 else if ( id->fmt.audio.i_rate != 44100 ||
1421 id->fmt.audio.i_channels != 2 )
1423 msg_Err( p_stream, "The Apple Lossless audio stream must be "
1424 "encoded with 44100 Hz and 2 channels" );
1428 /* Use this stream */
1429 p_sys->p_audio_stream = id;
1432 else if ( !p_sys->b_alac_warning )
1434 msg_Err( p_stream, "Apple Lossless is the only codec supported. "
1435 "Use the \"transcode\" module for conversion "
1436 "(e.g. \"transcode{acodec=alac,"
1437 "channels=2}\")." );
1438 p_sys->b_alac_warning = true;
1444 /* Leave other stream types alone */
1457 /*****************************************************************************
1459 *****************************************************************************/
1460 static int Del( sout_stream_t *p_stream, sout_stream_id_t *id )
1462 sout_stream_sys_t *p_sys = p_stream->p_sys;
1463 int i_err = VLC_SUCCESS;
1465 if ( p_sys->p_audio_stream == id )
1466 p_sys->p_audio_stream = NULL;
1474 /*****************************************************************************
1476 *****************************************************************************/
1477 static int Send( sout_stream_t *p_stream, sout_stream_id_t *id,
1480 sout_stream_sys_t *p_sys = p_stream->p_sys;
1482 if ( id->fmt.i_cat == AUDIO_ES && id == p_sys->p_audio_stream )
1484 /* SendAudio takes care of releasing the buffers */
1485 SendAudio( p_stream, p_buffer );
1489 block_ChainRelease( p_buffer );
1496 /*****************************************************************************
1497 * VolumeCallback: called when the volume is changed on the fly.
1498 *****************************************************************************/
1499 static int VolumeCallback( vlc_object_t *p_this, char const *psz_cmd,
1500 vlc_value_t oldval, vlc_value_t newval,
1503 VLC_UNUSED(psz_cmd);
1507 sout_stream_t *p_stream = (sout_stream_t*)p_this;
1508 sout_stream_sys_t *p_sys = p_stream->p_sys;
1510 /* TODO: Implement volume change */