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vlc/modules/stream_out/raop.c

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/*****************************************************************************
* raop.c: Remote Audio Output Protocol streaming support
*****************************************************************************
* Copyright (C) 2008 VLC authors and VideoLAN
* $Id$
*
* Author: Michael Hanselmann
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <gcrypt.h>
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_sout.h>
#include <vlc_block.h>
#include <vlc_network.h>
#include <vlc_strings.h>
#include <vlc_charset.h>
#include <vlc_fs.h>
#include <vlc_gcrypt.h>
#include <vlc_es.h>
#include <vlc_http.h>
#include <vlc_memory.h>
#define RAOP_PORT 5000
#define RAOP_USER_AGENT "VLC " VERSION
static const char ps_raop_rsa_pubkey[] =
"\xe7\xd7\x44\xf2\xa2\xe2\x78\x8b\x6c\x1f\x55\xa0\x8e\xb7\x05\x44"
"\xa8\xfa\x79\x45\xaa\x8b\xe6\xc6\x2c\xe5\xf5\x1c\xbd\xd4\xdc\x68"
"\x42\xfe\x3d\x10\x83\xdd\x2e\xde\xc1\xbf\xd4\x25\x2d\xc0\x2e\x6f"
"\x39\x8b\xdf\x0e\x61\x48\xea\x84\x85\x5e\x2e\x44\x2d\xa6\xd6\x26"
"\x64\xf6\x74\xa1\xf3\x04\x92\x9a\xde\x4f\x68\x93\xef\x2d\xf6\xe7"
"\x11\xa8\xc7\x7a\x0d\x91\xc9\xd9\x80\x82\x2e\x50\xd1\x29\x22\xaf"
"\xea\x40\xea\x9f\x0e\x14\xc0\xf7\x69\x38\xc5\xf3\x88\x2f\xc0\x32"
"\x3d\xd9\xfe\x55\x15\x5f\x51\xbb\x59\x21\xc2\x01\x62\x9f\xd7\x33"
"\x52\xd5\xe2\xef\xaa\xbf\x9b\xa0\x48\xd7\xb8\x13\xa2\xb6\x76\x7f"
"\x6c\x3c\xcf\x1e\xb4\xce\x67\x3d\x03\x7b\x0d\x2e\xa3\x0c\x5f\xff"
"\xeb\x06\xf8\xd0\x8a\xdd\xe4\x09\x57\x1a\x9c\x68\x9f\xef\x10\x72"
"\x88\x55\xdd\x8c\xfb\x9a\x8b\xef\x5c\x89\x43\xef\x3b\x5f\xaa\x15"
"\xdd\xe6\x98\xbe\xdd\xf3\x59\x96\x03\xeb\x3e\x6f\x61\x37\x2b\xb6"
"\x28\xf6\x55\x9f\x59\x9a\x78\xbf\x50\x06\x87\xaa\x7f\x49\x76\xc0"
"\x56\x2d\x41\x29\x56\xf8\x98\x9e\x18\xa6\x35\x5b\xd8\x15\x97\x82"
"\x5e\x0f\xc8\x75\x34\x3e\xc7\x82\x11\x76\x25\xcd\xbf\x98\x44\x7b";
static const char ps_raop_rsa_exp[] = "\x01\x00\x01";
static const char psz_delim_space[] = " ";
static const char psz_delim_colon[] = ":";
static const char psz_delim_equal[] = "=";
static const char psz_delim_semicolon[] = ";";
/*****************************************************************************
* Prototypes
*****************************************************************************/
static int Open( vlc_object_t * );
static void Close( vlc_object_t * );
static sout_stream_id_sys_t *Add( sout_stream_t *, es_format_t * );
static int Del( sout_stream_t *, sout_stream_id_sys_t * );
static int Send( sout_stream_t *, sout_stream_id_sys_t *, block_t* );
static int VolumeCallback( vlc_object_t *p_this, char const *psz_cmd,
vlc_value_t oldval, vlc_value_t newval,
void *p_data );
typedef enum
{
JACK_TYPE_NONE = 0,
JACK_TYPE_ANALOG,
JACK_TYPE_DIGITAL,
} jack_type_t;
struct sout_stream_sys_t
{
/* Input parameters */
char *psz_host;
char *psz_password;
int i_volume;
/* Plugin status */
sout_stream_id_sys_t *p_audio_stream;
bool b_alac_warning;
bool b_volume_callback;
/* Connection state */
int i_control_fd;
int i_stream_fd;
uint8_t ps_aes_key[16];
uint8_t ps_aes_iv[16];
gcry_cipher_hd_t aes_ctx;
char *psz_url;
char *psz_client_instance;
char *psz_session;
char *psz_last_status_line;
int i_cseq;
int i_server_port;
int i_audio_latency;
int i_jack_type;
http_auth_t auth;
/* Send buffer */
size_t i_sendbuf_len;
uint8_t *p_sendbuf;
};
struct sout_stream_id_sys_t
{
es_format_t fmt;
};
/*****************************************************************************
* Module descriptor
*****************************************************************************/
#define SOUT_CFG_PREFIX "sout-raop-"
#define HOST_TEXT N_("Host")
#define HOST_LONGTEXT N_("Hostname or IP address of target device")
#define VOLUME_TEXT N_("Volume")
#define VOLUME_LONGTEXT N_("Output volume for analog output: 0 for silence, " \
"1..255 from almost silent to very loud.")
#define PASSWORD_TEXT N_("Password")
#define PASSWORD_LONGTEXT N_("Password for target device.")
#define PASSWORD_FILE_TEXT N_("Password file")
#define PASSWORD_FILE_LONGTEXT N_("Read password for target device from file.")
vlc_module_begin();
set_shortname( N_("RAOP") )
set_description( N_("Remote Audio Output Protocol stream output") )
set_capability( "sout stream", 0 )
add_shortcut( "raop" )
set_category( CAT_SOUT )
set_subcategory( SUBCAT_SOUT_STREAM )
add_string( SOUT_CFG_PREFIX "host", "",
HOST_TEXT, HOST_LONGTEXT, false )
add_password( SOUT_CFG_PREFIX "password", NULL,
PASSWORD_TEXT, PASSWORD_LONGTEXT, false )
add_loadfile( SOUT_CFG_PREFIX "password-file", NULL,
PASSWORD_FILE_TEXT, PASSWORD_FILE_LONGTEXT, false )
add_integer_with_range( SOUT_CFG_PREFIX "volume", 100, 0, 255,
VOLUME_TEXT, VOLUME_LONGTEXT, false )
set_callbacks( Open, Close )
vlc_module_end()
static const char *const ppsz_sout_options[] = {
"host",
"password",
"password-file",
"volume",
NULL
};
/*****************************************************************************
* Utilities:
*****************************************************************************/
static void FreeSys( vlc_object_t *p_this, sout_stream_sys_t *p_sys )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
if ( p_sys->i_control_fd >= 0 )
net_Close( p_sys->i_control_fd );
if ( p_sys->i_stream_fd >= 0 )
net_Close( p_sys->i_stream_fd );
if ( p_sys->b_volume_callback )
var_DelCallback( p_stream, SOUT_CFG_PREFIX "volume",
VolumeCallback, NULL );
gcry_cipher_close( p_sys->aes_ctx );
free( p_sys->p_sendbuf );
free( p_sys->psz_host );
free( p_sys->psz_password );
free( p_sys->psz_url );
free( p_sys->psz_session );
free( p_sys->psz_client_instance );
free( p_sys->psz_last_status_line );
free( p_sys );
}
static void FreeId( sout_stream_id_sys_t *id )
{
free( id );
}
static void RemoveBase64Padding( char *str )
{
char *ps_pos = strchr( str, '=' );
if ( ps_pos != NULL )
*ps_pos = '\0';
}
static int CheckForGcryptErrorWithLine( sout_stream_t *p_stream,
gcry_error_t i_gcrypt_err,
unsigned int i_line )
{
if ( i_gcrypt_err != GPG_ERR_NO_ERROR )
{
msg_Err( p_stream, "gcrypt error (line %d): %s", i_line,
gpg_strerror( i_gcrypt_err ) );
return 1;
}
return 0;
}
/* Wrapper to pass line number for easier debugging */
#define CheckForGcryptError( p_this, i_gcrypt_err ) \
CheckForGcryptErrorWithLine( p_this, i_gcrypt_err, __LINE__ )
/* MGF1 is specified in RFC2437, section 10.2.1. Variables are named after the
* specification.
*/
static int MGF1( vlc_object_t *p_this,
unsigned char *mask, size_t l,
const unsigned char *Z, const size_t zLen,
const int Hash )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
gcry_error_t i_gcrypt_err;
gcry_md_hd_t md_handle = NULL;
unsigned int hLen;
unsigned char *ps_md;
uint32_t counter = 0;
uint8_t C[4];
size_t i_copylen;
int i_err = VLC_SUCCESS;
assert( mask != NULL );
assert( Z != NULL );
hLen = gcry_md_get_algo_dlen( Hash );
i_gcrypt_err = gcry_md_open( &md_handle, Hash, 0 );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
{
i_err = VLC_EGENERIC;
goto error;
}
while ( l > 0 )
{
/* 3. For counter from 0 to \lceil{l / hLen}\rceil-1, do the following:
* a. Convert counter to an octet string C of length 4 with the
* primitive I2OSP: C = I2OSP (counter, 4)
*/
C[0] = (counter >> 24) & 0xff;
C[1] = (counter >> 16) & 0xff;
C[2] = (counter >> 8) & 0xff;
C[3] = counter & 0xff;
++counter;
/* b. Concatenate the hash of the seed Z and C to the octet string T:
* T = T || Hash (Z || C)
*/
gcry_md_reset( md_handle );
gcry_md_write( md_handle, Z, zLen );
gcry_md_write( md_handle, C, 4 );
ps_md = gcry_md_read( md_handle, Hash );
/* 4. Output the leading l octets of T as the octet string mask. */
i_copylen = __MIN( l, hLen );
memcpy( mask, ps_md, i_copylen );
mask += i_copylen;
l -= i_copylen;
}
error:
gcry_md_close( md_handle );
return i_err;
}
/* EME-OAEP-ENCODE is specified in RFC2437, section 9.1.1.1. Variables are
* named after the specification.
*/
static int AddOaepPadding( vlc_object_t *p_this,
unsigned char *EM, const size_t emLenWithPrefix,
const unsigned char *M, const size_t mLen,
const unsigned char *P, const size_t pLen )
{
const int Hash = GCRY_MD_SHA1;
const unsigned int hLen = gcry_md_get_algo_dlen( Hash );
unsigned char *seed = NULL;
unsigned char *DB = NULL;
unsigned char *dbMask = NULL;
unsigned char *seedMask = NULL;
size_t emLen;
size_t psLen;
size_t i;
int i_err = VLC_SUCCESS;
/* Space for 0x00 prefix in EM. */
emLen = emLenWithPrefix - 1;
/* Step 2:
* If ||M|| > emLen-2hLen-1 then output "message too long" and stop.
*/
if ( mLen > (emLen - (2 * hLen) - 1) )
{
msg_Err( p_this , "Message too long" );
goto error;
}
/* Step 3:
* Generate an octet string PS consisting of emLen-||M||-2hLen-1 zero
* octets. The length of PS may be 0.
*/
psLen = emLen - mLen - (2 * hLen) - 1;
/*
* Step 5:
* Concatenate pHash, PS, the message M, and other padding to form a data
* block DB as: DB = pHash || PS || 01 || M
*/
DB = calloc( 1, hLen + psLen + 1 + mLen );
dbMask = calloc( 1, emLen - hLen );
seedMask = calloc( 1, hLen );
if ( DB == NULL || dbMask == NULL || seedMask == NULL )
{
i_err = VLC_ENOMEM;
goto error;
}
/* Step 4:
* Let pHash = Hash(P), an octet string of length hLen.
*/
gcry_md_hash_buffer( Hash, DB, P, pLen );
/* Step 3:
* Generate an octet string PS consisting of emLen-||M||-2hLen-1 zero
* octets. The length of PS may be 0.
*/
memset( DB + hLen, 0, psLen );
/* Step 5:
* Concatenate pHash, PS, the message M, and other padding to form a data
* block DB as: DB = pHash || PS || 01 || M
*/
DB[hLen + psLen] = 0x01;
memcpy( DB + hLen + psLen + 1, M, mLen );
/* Step 6:
* Generate a random octet string seed of length hLen
*/
seed = gcry_random_bytes( hLen, GCRY_STRONG_RANDOM );
if ( seed == NULL )
{
i_err = VLC_ENOMEM;
goto error;
}
/* Step 7:
* Let dbMask = MGF(seed, emLen-hLen).
*/
i_err = MGF1( p_this, dbMask, emLen - hLen, seed, hLen, Hash );
if ( i_err != VLC_SUCCESS )
goto error;
/* Step 8:
* Let maskedDB = DB \xor dbMask.
*/
for ( i = 0; i < (emLen - hLen); ++i )
DB[i] ^= dbMask[i];
/* Step 9:
* Let seedMask = MGF(maskedDB, hLen).
*/
i_err = MGF1( p_this, seedMask, hLen, DB, emLen - hLen, Hash );
if ( i_err != VLC_SUCCESS )
goto error;
/* Step 10:
* Let maskedSeed = seed \xor seedMask.
*/
for ( i = 0; i < hLen; ++i )
seed[i] ^= seedMask[i];
/* Step 11:
* Let EM = maskedSeed || maskedDB.
*/
assert( (1 + hLen + (hLen + psLen + 1 + mLen)) == emLenWithPrefix );
EM[0] = 0x00;
memcpy( EM + 1, seed, hLen );
memcpy( EM + 1 + hLen, DB, hLen + psLen + 1 + mLen );
/* Step 12:
* Output EM.
*/
error:
free( DB );
free( dbMask );
free( seedMask );
free( seed );
return i_err;
}
static int EncryptAesKeyBase64( vlc_object_t *p_this, char **result )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
gcry_error_t i_gcrypt_err;
gcry_sexp_t sexp_rsa_params = NULL;
gcry_sexp_t sexp_input = NULL;
gcry_sexp_t sexp_encrypted = NULL;
gcry_sexp_t sexp_token_a = NULL;
gcry_mpi_t mpi_pubkey = NULL;
gcry_mpi_t mpi_exp = NULL;
gcry_mpi_t mpi_input = NULL;
gcry_mpi_t mpi_output = NULL;
unsigned char ps_padded_key[256];
unsigned char *ps_value;
size_t i_value_size;
int i_err;
/* Add RSA-OAES-SHA1 padding */
i_err = AddOaepPadding( p_this,
ps_padded_key, sizeof( ps_padded_key ),
p_sys->ps_aes_key, sizeof( p_sys->ps_aes_key ),
NULL, 0 );
if ( i_err != VLC_SUCCESS )
goto error;
i_err = VLC_EGENERIC;
/* Read public key */
i_gcrypt_err = gcry_mpi_scan( &mpi_pubkey, GCRYMPI_FMT_USG,
ps_raop_rsa_pubkey,
sizeof( ps_raop_rsa_pubkey ) - 1, NULL );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
goto error;
/* Read exponent */
i_gcrypt_err = gcry_mpi_scan( &mpi_exp, GCRYMPI_FMT_USG, ps_raop_rsa_exp,
sizeof( ps_raop_rsa_exp ) - 1, NULL );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
goto error;
/* If the input data starts with a set bit (0x80), gcrypt thinks it's a
* signed integer and complains. Prefixing it with a zero byte (\0)
* works, but involves more work. Converting it to an MPI in our code is
* cleaner.
*/
i_gcrypt_err = gcry_mpi_scan( &mpi_input, GCRYMPI_FMT_USG,
ps_padded_key, sizeof( ps_padded_key ),
NULL);
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
goto error;
/* Build S-expression with RSA parameters */
i_gcrypt_err = gcry_sexp_build( &sexp_rsa_params, NULL,
"(public-key(rsa(n %m)(e %m)))",
mpi_pubkey, mpi_exp );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
goto error;
/* Build S-expression for data */
i_gcrypt_err = gcry_sexp_build( &sexp_input, NULL, "(data(value %m))",
mpi_input );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
goto error;
/* Encrypt data */
i_gcrypt_err = gcry_pk_encrypt( &sexp_encrypted, sexp_input,
sexp_rsa_params );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
goto error;
/* Extract encrypted data */
sexp_token_a = gcry_sexp_find_token( sexp_encrypted, "a", 0 );
if ( !sexp_token_a )
{
msg_Err( p_this , "Token 'a' not found in result S-expression" );
goto error;
}
mpi_output = gcry_sexp_nth_mpi( sexp_token_a, 1, GCRYMPI_FMT_USG );
if ( !mpi_output )
{
msg_Err( p_this, "Unable to extract MPI from result" );
goto error;
}
/* Copy encrypted data into char array */
i_gcrypt_err = gcry_mpi_aprint( GCRYMPI_FMT_USG, &ps_value, &i_value_size,
mpi_output );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
{
goto error;
}
/* Encode in Base64 */
*result = vlc_b64_encode_binary( ps_value, i_value_size );
i_err = VLC_SUCCESS;
error:
gcry_sexp_release( sexp_rsa_params );
gcry_sexp_release( sexp_input );
gcry_sexp_release( sexp_encrypted );
gcry_sexp_release( sexp_token_a );
gcry_mpi_release( mpi_pubkey );
gcry_mpi_release( mpi_exp );
gcry_mpi_release( mpi_input );
gcry_mpi_release( mpi_output );
return i_err;
}
static char *ReadPasswordFile( vlc_object_t *p_this, const char *psz_path )
{
FILE *p_file = NULL;
char *psz_password = NULL;
char *psz_newline;
char ps_buffer[256];
p_file = vlc_fopen( psz_path, "rt" );
if ( p_file == NULL )
{
msg_Err( p_this, "Unable to open password file '%s': %s", psz_path,
vlc_strerror_c(errno) );
goto error;
}
/* Read one line only */
if ( fgets( ps_buffer, sizeof( ps_buffer ), p_file ) == NULL )
{
if ( ferror( p_file ) )
{
msg_Err( p_this, "Error reading '%s': %s", psz_path,
vlc_strerror_c(errno) );
goto error;
}
/* Nothing was read, but there was no error either. Maybe the file is
* empty. Not all implementations of fgets(3) write \0 to the output
* buffer in this case.
*/
ps_buffer[0] = '\0';
} else {
/* Replace first newline with '\0' */
psz_newline = strchr( ps_buffer, '\n' );
if ( psz_newline != NULL )
*psz_newline = '\0';
}
if ( *ps_buffer == '\0' ) {
msg_Err( p_this, "No password could be read from '%s'", psz_path );
goto error;
}
psz_password = strdup( ps_buffer );
error:
if ( p_file != NULL )
fclose( p_file );
return psz_password;
}
/* Splits the value of a received header.
*
* Example: "Transport: RTP/AVP/TCP;unicast;mode=record;server_port=6000"
*/
static int SplitHeader( char **ppsz_next, char **ppsz_name,
char **ppsz_value )
{
/* Find semicolon (separator between assignments) */
*ppsz_name = strsep( ppsz_next, psz_delim_semicolon );
if ( *ppsz_name )
{
/* Skip spaces */
*ppsz_name += strspn( *ppsz_name, psz_delim_space );
/* Get value */
*ppsz_value = *ppsz_name;
strsep( ppsz_value, psz_delim_equal );
}
else
*ppsz_value = NULL;
return !!*ppsz_name;
}
static void FreeHeader( void *p_value, void *p_data )
{
VLC_UNUSED( p_data );
free( p_value );
}
static int ReadStatusLine( vlc_object_t *p_this )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
char *psz_line = NULL;
char *psz_token;
char *psz_next;
int i_result = VLC_EGENERIC;
p_sys->psz_last_status_line = net_Gets( p_this, p_sys->i_control_fd,
NULL );
if ( !p_sys->psz_last_status_line )
goto error;
/* Create working copy */
psz_line = strdup( p_sys->psz_last_status_line );
psz_next = psz_line;
/* Protocol field */
psz_token = strsep( &psz_next, psz_delim_space );
if ( !psz_token || strncmp( psz_token, "RTSP/1.", 7 ) != 0 )
{
msg_Err( p_this, "Unknown protocol (%s)",
p_sys->psz_last_status_line );
goto error;
}
/* Status field */
psz_token = strsep( &psz_next, psz_delim_space );
if ( !psz_token )
{
msg_Err( p_this, "Request failed (%s)",
p_sys->psz_last_status_line );
goto error;
}
i_result = atoi( psz_token );
error:
free( psz_line );
return i_result;
}
static int ReadHeader( vlc_object_t *p_this,
vlc_dictionary_t *p_resp_headers,
int *done )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
char *psz_original = NULL;
char *psz_line = NULL;
char *psz_token;
char *psz_next;
char *psz_name;
char *psz_value;
int i_err = VLC_SUCCESS;
psz_line = net_Gets( p_this, p_sys->i_control_fd, NULL );
if ( !psz_line )
{
i_err = VLC_EGENERIC;
goto error;
}
/* Empty line for response end */
if ( psz_line[0] == '\0' )
*done = 1;
else
{
psz_original = strdup( psz_line );
psz_next = psz_line;
psz_token = strsep( &psz_next, psz_delim_colon );
if ( !psz_token || psz_next[0] != ' ' )
{
msg_Err( p_this, "Invalid header format (%s)", psz_original );
i_err = VLC_EGENERIC;
goto error;
}
psz_name = psz_token;
psz_value = psz_next + 1;
vlc_dictionary_insert( p_resp_headers, psz_name, strdup( psz_value ) );
}
error:
free( psz_original );
free( psz_line );
return i_err;
}
static int WriteAuxHeaders( vlc_object_t *p_this,
vlc_dictionary_t *p_req_headers )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
char **ppsz_keys = NULL;
char *psz_key;
char *psz_value;
int i_err = VLC_SUCCESS;
int i_rc;
size_t i;
ppsz_keys = vlc_dictionary_all_keys( p_req_headers );
for ( i = 0; ppsz_keys[i]; ++i )
{
psz_key = ppsz_keys[i];
psz_value = vlc_dictionary_value_for_key( p_req_headers, psz_key );
i_rc = net_Printf( p_this, p_sys->i_control_fd, NULL,
"%s: %s\r\n", psz_key, psz_value );
if ( i_rc < 0 )
{
i_err = VLC_EGENERIC;
goto error;
}
}
error:
for ( i = 0; ppsz_keys[i]; ++i )
free( ppsz_keys[i] );
free( ppsz_keys );
return i_err;
}
static int SendRequest( vlc_object_t *p_this, const char *psz_method,
const char *psz_content_type, const char *psz_body,
vlc_dictionary_t *p_req_headers )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
const unsigned char psz_headers_end[] = "\r\n";
size_t i_body_length = 0;
int i_err = VLC_SUCCESS;
int i_rc;
i_rc = net_Printf( p_this, p_sys->i_control_fd, NULL,
"%s %s RTSP/1.0\r\n"
"User-Agent: " RAOP_USER_AGENT "\r\n"
"Client-Instance: %s\r\n"
"CSeq: %d\r\n",
psz_method, p_sys->psz_url,
p_sys->psz_client_instance,
++p_sys->i_cseq );
if ( i_rc < 0 )
{
i_err = VLC_EGENERIC;
goto error;
}
if ( psz_content_type )
{
i_rc = net_Printf( p_this, p_sys->i_control_fd, NULL,
"Content-Type: %s\r\n", psz_content_type );
if ( i_rc < 0 )
{
i_err = VLC_ENOMEM;
goto error;
}
}
if ( psz_body )
{
i_body_length = strlen( psz_body );
i_rc = net_Printf( p_this, p_sys->i_control_fd, NULL,
"Content-Length: %u\r\n",
(unsigned int)i_body_length );
if ( i_rc < 0 )
{
i_err = VLC_ENOMEM;
goto error;
}
}
i_err = WriteAuxHeaders( p_this, p_req_headers );
if ( i_err != VLC_SUCCESS )
goto error;
i_rc = net_Write( p_this, p_sys->i_control_fd, NULL,
psz_headers_end, sizeof( psz_headers_end ) - 1 );
if ( i_rc < 0 )
{
i_err = VLC_ENOMEM;
goto error;
}
if ( psz_body )
net_Write( p_this, p_sys->i_control_fd, NULL,
psz_body, i_body_length );
error:
return i_err;
}
static int ParseAuthenticateHeader( vlc_object_t *p_this,
vlc_dictionary_t *p_resp_headers )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
char *psz_auth;
int i_err = VLC_SUCCESS;
psz_auth = vlc_dictionary_value_for_key( p_resp_headers,
"WWW-Authenticate" );
if ( psz_auth == NULL )
{
msg_Err( p_this, "HTTP 401 response missing "
"WWW-Authenticate header" );
i_err = VLC_EGENERIC;
goto error;
}
http_auth_ParseWwwAuthenticateHeader( p_this, &p_sys->auth, psz_auth );
error:
return i_err;
}
static int ExecRequest( vlc_object_t *p_this, const char *psz_method,
const char *psz_content_type, const char *psz_body,
vlc_dictionary_t *p_req_headers,
vlc_dictionary_t *p_resp_headers )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
char *psz_authorization = NULL;
int headers_done;
int i_err = VLC_SUCCESS;
int i_status;
int i_auth_state;
if ( p_sys->i_control_fd < 0 )
{
msg_Err( p_this, "Control connection not open" );
i_err = VLC_EGENERIC;
goto error;
}
i_auth_state = 0;
while ( 1 )
{
/* Send header only when Digest authentication is used */
if ( p_sys->psz_password != NULL && p_sys->auth.psz_nonce != NULL )
{
FREENULL( psz_authorization );
psz_authorization =
http_auth_FormatAuthorizationHeader( p_this, &p_sys->auth,
psz_method,
p_sys->psz_url, "",
p_sys->psz_password );
if ( psz_authorization == NULL )
{
i_err = VLC_EGENERIC;
goto error;
}
vlc_dictionary_insert( p_req_headers, "Authorization",
psz_authorization );
}
/* Send request */
i_err = SendRequest( p_this, psz_method, psz_content_type, psz_body,
p_req_headers);
if ( i_err != VLC_SUCCESS )
goto error;
/* Read status line */
i_status = ReadStatusLine( p_this );
if ( i_status < 0 )
{
i_err = i_status;
goto error;
}
vlc_dictionary_clear( p_resp_headers, FreeHeader, NULL );
/* Read headers */
headers_done = 0;
while ( !headers_done )
{
i_err = ReadHeader( p_this, p_resp_headers, &headers_done );
if ( i_err != VLC_SUCCESS )
goto error;
}
if ( i_status == 200 )
/* Request successful */
break;
else if ( i_status == 401 )
{
/* Authorization required */
if ( i_auth_state == 1 || p_sys->psz_password == NULL )
{
msg_Err( p_this, "Access denied, password invalid" );
i_err = VLC_EGENERIC;
goto error;
}
i_err = ParseAuthenticateHeader( p_this, p_resp_headers );
if ( i_err != VLC_SUCCESS )
goto error;
i_auth_state = 1;
}
else
{
msg_Err( p_this, "Request failed (%s), status is %d",
p_sys->psz_last_status_line, i_status );
i_err = VLC_EGENERIC;
goto error;
}
}
error:
FREENULL( p_sys->psz_last_status_line );
free( psz_authorization );
return i_err;
}
static int AnnounceSDP( vlc_object_t *p_this, char *psz_local,
uint32_t i_session_id )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
vlc_dictionary_t req_headers;
vlc_dictionary_t resp_headers;
unsigned char ps_sac[16];
char *psz_sdp = NULL;
char *psz_sac_base64 = NULL;
char *psz_aes_key_base64 = NULL;
char *psz_aes_iv_base64 = NULL;
int i_err = VLC_SUCCESS;
int i_rc;
vlc_dictionary_init( &req_headers, 0 );
vlc_dictionary_init( &resp_headers, 0 );
/* Encrypt AES key and encode it in Base64 */
i_rc = EncryptAesKeyBase64( p_this, &psz_aes_key_base64 );
if ( i_rc != VLC_SUCCESS || psz_aes_key_base64 == NULL )
{
i_err = VLC_EGENERIC;
goto error;
}
RemoveBase64Padding( psz_aes_key_base64 );
/* Encode AES IV in Base64 */
psz_aes_iv_base64 = vlc_b64_encode_binary( p_sys->ps_aes_iv,
sizeof( p_sys->ps_aes_iv ) );
if ( psz_aes_iv_base64 == NULL )
{
i_err = VLC_EGENERIC;
goto error;
}
RemoveBase64Padding( psz_aes_iv_base64 );
/* Random bytes for Apple-Challenge header */
gcry_randomize( ps_sac, sizeof( ps_sac ), GCRY_STRONG_RANDOM );
psz_sac_base64 = vlc_b64_encode_binary( ps_sac, sizeof( ps_sac ) );
if ( psz_sac_base64 == NULL )
{
i_err = VLC_EGENERIC;
goto error;
}
RemoveBase64Padding( psz_sac_base64 );
/* Build SDP
* Note: IPv6 addresses also use "IP4". Make sure not to include the
* scope ID.
*/
i_rc = asprintf( &psz_sdp,
"v=0\r\n"
"o=iTunes %u 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 4096 0 16 40 10 14 2 255 0 0 44100\r\n"
"a=rsaaeskey:%s\r\n"
"a=aesiv:%s\r\n",
i_session_id, psz_local, p_sys->psz_host,
psz_aes_key_base64, psz_aes_iv_base64 );
if ( i_rc < 0 )
{
i_err = VLC_ENOMEM;
goto error;
}
/* Build and send request */
vlc_dictionary_insert( &req_headers, "Apple-Challenge", psz_sac_base64 );
i_err = ExecRequest( p_this, "ANNOUNCE", "application/sdp", psz_sdp,
&req_headers, &resp_headers);
if ( i_err != VLC_SUCCESS )
goto error;
error:
vlc_dictionary_clear( &req_headers, NULL, NULL );
vlc_dictionary_clear( &resp_headers, FreeHeader, NULL );
free( psz_sdp );
free( psz_sac_base64 );
free( psz_aes_key_base64 );
free( psz_aes_iv_base64 );
return i_err;
}
static int SendSetup( vlc_object_t *p_this )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
vlc_dictionary_t req_headers;
vlc_dictionary_t resp_headers;
int i_err = VLC_SUCCESS;
char *psz_tmp;
char *psz_next;
char *psz_name;
char *psz_value;
vlc_dictionary_init( &req_headers, 0 );
vlc_dictionary_init( &resp_headers, 0 );
vlc_dictionary_insert( &req_headers, "Transport",
((void*)"RTP/AVP/TCP;unicast;interleaved=0-1;"
"mode=record") );
i_err = ExecRequest( p_this, "SETUP", NULL, NULL,
&req_headers, &resp_headers );
if ( i_err != VLC_SUCCESS )
goto error;
psz_tmp = vlc_dictionary_value_for_key( &resp_headers, "Session" );
if ( !psz_tmp )
{
msg_Err( p_this, "Missing 'Session' header during setup" );
i_err = VLC_EGENERIC;
goto error;
}
free( p_sys->psz_session );
p_sys->psz_session = strdup( psz_tmp );
/* Get server_port */
psz_next = vlc_dictionary_value_for_key( &resp_headers, "Transport" );
while ( SplitHeader( &psz_next, &psz_name, &psz_value ) )
{
if ( psz_value && strcmp( psz_name, "server_port" ) == 0 )
{
p_sys->i_server_port = atoi( psz_value );
break;
}
}
if ( !p_sys->i_server_port )
{
msg_Err( p_this, "Missing 'server_port' during setup" );
i_err = VLC_EGENERIC;
goto error;
}
/* Get jack type */
psz_next = vlc_dictionary_value_for_key( &resp_headers,
"Audio-Jack-Status" );
while ( SplitHeader( &psz_next, &psz_name, &psz_value ) )
{
if ( strcmp( psz_name, "type" ) != 0 )
continue;
if ( strcmp( psz_value, "analog" ) == 0 )
p_sys->i_jack_type = JACK_TYPE_ANALOG;
else if ( strcmp( psz_value, "digital" ) == 0 )
p_sys->i_jack_type = JACK_TYPE_DIGITAL;
break;
}
error:
vlc_dictionary_clear( &req_headers, NULL, NULL );
vlc_dictionary_clear( &resp_headers, FreeHeader, NULL );
return i_err;
}
static int SendRecord( vlc_object_t *p_this )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
vlc_dictionary_t req_headers;
vlc_dictionary_t resp_headers;
int i_err = VLC_SUCCESS;
char *psz_value;
vlc_dictionary_init( &req_headers, 0 );
vlc_dictionary_init( &resp_headers, 0 );
vlc_dictionary_insert( &req_headers, "Range", (void *)"npt=0-" );
vlc_dictionary_insert( &req_headers, "RTP-Info",
(void *)"seq=0;rtptime=0" );
vlc_dictionary_insert( &req_headers, "Session",
(void *)p_sys->psz_session );
i_err = ExecRequest( p_this, "RECORD", NULL, NULL,
&req_headers, &resp_headers );
if ( i_err != VLC_SUCCESS )
goto error;
psz_value = vlc_dictionary_value_for_key( &resp_headers, "Audio-Latency" );
if ( psz_value )
p_sys->i_audio_latency = atoi( psz_value );
else
p_sys->i_audio_latency = 0;
error:
vlc_dictionary_clear( &req_headers, NULL, NULL );
vlc_dictionary_clear( &resp_headers, FreeHeader, NULL );
return i_err;
}
static int SendFlush( vlc_object_t *p_this )
{
VLC_UNUSED( p_this );
vlc_dictionary_t resp_headers;
vlc_dictionary_t req_headers;
int i_err = VLC_SUCCESS;
vlc_dictionary_init( &req_headers, 0 );
vlc_dictionary_init( &resp_headers, 0 );
vlc_dictionary_insert( &req_headers, "RTP-Info",
(void *)"seq=0;rtptime=0" );
i_err = ExecRequest( p_this, "FLUSH", NULL, NULL,
&req_headers, &resp_headers );
if ( i_err != VLC_SUCCESS )
goto error;
error:
vlc_dictionary_clear( &req_headers, NULL, NULL );
vlc_dictionary_clear( &resp_headers, FreeHeader, NULL );
return i_err;
}
static int SendTeardown( vlc_object_t *p_this )
{
vlc_dictionary_t resp_headers;
vlc_dictionary_t req_headers;
int i_err = VLC_SUCCESS;
vlc_dictionary_init( &req_headers, 0 );
vlc_dictionary_init( &resp_headers, 0 );
i_err = ExecRequest( p_this, "TEARDOWN", NULL, NULL,
&req_headers, &resp_headers );
if ( i_err != VLC_SUCCESS )
goto error;
error:
vlc_dictionary_clear( &req_headers, NULL, NULL );
vlc_dictionary_clear( &resp_headers, FreeHeader, NULL );
return i_err;
}
static int UpdateVolume( vlc_object_t *p_this )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
vlc_dictionary_t req_headers;
vlc_dictionary_t resp_headers;
char *psz_parameters = NULL;
double d_volume;
int i_err = VLC_SUCCESS;
int i_rc;
vlc_dictionary_init( &req_headers, 0 );
vlc_dictionary_init( &resp_headers, 0 );
/* Our volume is 0..255, RAOP is -144..0 (-144 off, -30..0 on) */
/* Limit range */
p_sys->i_volume = VLC_CLIP( p_sys->i_volume, 0, 255 );
if ( p_sys->i_volume == 0 )
d_volume = -144.0;
else
d_volume = -30 + ( ( (double)p_sys->i_volume ) * 30.0 / 255.0 );
/* Format without using locales */
i_rc = us_asprintf( &psz_parameters, "volume: %0.6f\r\n", d_volume );
if ( i_rc < 0 )
{
i_err = VLC_ENOMEM;
goto error;
}
vlc_dictionary_insert( &req_headers, "Session",
(void *)p_sys->psz_session );
i_err = ExecRequest( p_this, "SET_PARAMETER",
"text/parameters", psz_parameters,
&req_headers, &resp_headers );
if ( i_err != VLC_SUCCESS )
goto error;
error:
vlc_dictionary_clear( &req_headers, NULL, NULL );
vlc_dictionary_clear( &resp_headers, FreeHeader, NULL );
free( psz_parameters );
return i_err;
}
static void LogInfo( vlc_object_t *p_this )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
const char *psz_jack_name;
msg_Info( p_this, "Audio latency: %d", p_sys->i_audio_latency );
switch ( p_sys->i_jack_type )
{
case JACK_TYPE_ANALOG:
psz_jack_name = "analog";
break;
case JACK_TYPE_DIGITAL:
psz_jack_name = "digital";
break;
case JACK_TYPE_NONE:
default:
psz_jack_name = "none";
break;
}
msg_Info( p_this, "Jack type: %s", psz_jack_name );
}
static void SendAudio( sout_stream_t *p_stream, block_t *p_buffer )
{
sout_stream_sys_t *p_sys = p_stream->p_sys;
gcry_error_t i_gcrypt_err;
block_t *p_next;
size_t i_len;
size_t i_payload_len;
size_t i_realloc_len;
int rc;
const uint8_t header[16] = {
0x24, 0x00, 0x00, 0x00,
0xf0, 0xff, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
};
while ( p_buffer )
{
i_len = sizeof( header ) + p_buffer->i_buffer;
/* Buffer resize needed? */
if ( i_len > p_sys->i_sendbuf_len || p_sys->p_sendbuf == NULL )
{
/* Grow in blocks of 4K */
i_realloc_len = (1 + (i_len / 4096)) * 4096;
p_sys->p_sendbuf = realloc_or_free( p_sys->p_sendbuf, i_realloc_len );
if ( p_sys->p_sendbuf == NULL )
goto error;
p_sys->i_sendbuf_len = i_realloc_len;
}
/* Fill buffer */
memcpy( p_sys->p_sendbuf, header, sizeof( header ) );
memcpy( p_sys->p_sendbuf + sizeof( header ),
p_buffer->p_buffer, p_buffer->i_buffer );
/* Calculate payload length and update header */
i_payload_len = i_len - 4;
if ( i_payload_len > 0xffff )
{
msg_Err( p_stream, "Buffer is too long (%u bytes)",
(unsigned int)i_payload_len );
goto error;
}
p_sys->p_sendbuf[2] = ( i_payload_len >> 8 ) & 0xff;
p_sys->p_sendbuf[3] = i_payload_len & 0xff;
/* Reset cipher */
i_gcrypt_err = gcry_cipher_reset( p_sys->aes_ctx );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
goto error;
/* Set IV */
i_gcrypt_err = gcry_cipher_setiv( p_sys->aes_ctx, p_sys->ps_aes_iv,
sizeof( p_sys->ps_aes_iv ) );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
goto error;
/* Encrypt in place. Only full blocks of 16 bytes are encrypted,
* the rest (0-15 bytes) is left unencrypted.
*/
i_gcrypt_err =
gcry_cipher_encrypt( p_sys->aes_ctx,
p_sys->p_sendbuf + sizeof( header ),
( p_buffer->i_buffer / 16 ) * 16,
NULL, 0 );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
goto error;
/* Send data */
rc = net_Write( p_stream, p_sys->i_stream_fd, NULL,
p_sys->p_sendbuf, i_len );
if ( rc < 0 )
goto error;
p_next = p_buffer->p_next;
block_Release( p_buffer );
p_buffer = p_next;
}
error:
block_ChainRelease( p_buffer );
return;
}
/*****************************************************************************
* Open:
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys;
char psz_local[NI_MAXNUMERICHOST];
char *psz_pwfile = NULL;
gcry_error_t i_gcrypt_err;
int i_err = VLC_SUCCESS;
uint32_t i_session_id;
uint64_t i_client_instance;
vlc_gcrypt_init();
config_ChainParse( p_stream, SOUT_CFG_PREFIX, ppsz_sout_options,
p_stream->p_cfg );
p_sys = calloc( 1, sizeof( *p_sys ) );
if ( p_sys == NULL )
return VLC_ENOMEM;
p_stream->pf_add = Add;
p_stream->pf_del = Del;
p_stream->pf_send = Send;
p_stream->p_sys = p_sys;
p_stream->pace_nocontrol = true;
p_sys->i_control_fd = -1;
p_sys->i_stream_fd = -1;
p_sys->i_volume = var_GetInteger( p_stream, SOUT_CFG_PREFIX "volume");
p_sys->i_jack_type = JACK_TYPE_NONE;
http_auth_Init( &p_sys->auth );
p_sys->psz_host = var_GetNonEmptyString( p_stream,
SOUT_CFG_PREFIX "host" );
if ( p_sys->psz_host == NULL )
{
msg_Err( p_this, "Missing host" );
i_err = VLC_EGENERIC;
goto error;
}
p_sys->psz_password = var_GetNonEmptyString( p_stream,
SOUT_CFG_PREFIX "password" );
if ( p_sys->psz_password == NULL )
{
/* Try password file instead */
psz_pwfile = var_GetNonEmptyString( p_stream,
SOUT_CFG_PREFIX "password-file" );
if ( psz_pwfile != NULL )
{
p_sys->psz_password = ReadPasswordFile( p_this, psz_pwfile );
if ( p_sys->psz_password == NULL )
{
i_err = VLC_EGENERIC;
goto error;
}
}
}
if ( p_sys->psz_password != NULL )
msg_Info( p_this, "Using password authentication" );
var_AddCallback( p_stream, SOUT_CFG_PREFIX "volume",
VolumeCallback, NULL );
p_sys->b_volume_callback = true;
/* Open control connection */
p_sys->i_control_fd = net_ConnectTCP( p_stream, p_sys->psz_host,
RAOP_PORT );
if ( p_sys->i_control_fd < 0 )
{
msg_Err( p_this, "Cannot establish control connection to %s:%d (%s)",
p_sys->psz_host, RAOP_PORT, vlc_strerror_c(errno) );
i_err = VLC_EGENERIC;
goto error;
}
/* Get local IP address */
if ( net_GetSockAddress( p_sys->i_control_fd, psz_local, NULL ) )
{
msg_Err( p_this, "cannot get local IP address" );
i_err = VLC_EGENERIC;
goto error;
}
/* Random session ID */
gcry_randomize( &i_session_id, sizeof( i_session_id ),
GCRY_STRONG_RANDOM );
/* Random client instance */
gcry_randomize( &i_client_instance, sizeof( i_client_instance ),
GCRY_STRONG_RANDOM );
if ( asprintf( &p_sys->psz_client_instance, "%016"PRIX64,
i_client_instance ) < 0 )
{
i_err = VLC_ENOMEM;
goto error;
}
/* Build session URL */
if ( asprintf( &p_sys->psz_url, "rtsp://%s/%u",
psz_local, i_session_id ) < 0 )
{
i_err = VLC_ENOMEM;
goto error;
}
/* Generate AES key and IV */
gcry_randomize( p_sys->ps_aes_key, sizeof( p_sys->ps_aes_key ),
GCRY_STRONG_RANDOM );
gcry_randomize( p_sys->ps_aes_iv, sizeof( p_sys->ps_aes_iv ),
GCRY_STRONG_RANDOM );
/* Setup AES */
i_gcrypt_err = gcry_cipher_open( &p_sys->aes_ctx, GCRY_CIPHER_AES,
GCRY_CIPHER_MODE_CBC, 0 );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
{
i_err = VLC_EGENERIC;
goto error;
}
/* Set key */
i_gcrypt_err = gcry_cipher_setkey( p_sys->aes_ctx, p_sys->ps_aes_key,
sizeof( p_sys->ps_aes_key ) );
if ( CheckForGcryptError( p_stream, i_gcrypt_err ) )
{
i_err = VLC_EGENERIC;
goto error;
}
/* Protocol handshake */
i_err = AnnounceSDP( p_this, psz_local, i_session_id );
if ( i_err != VLC_SUCCESS )
goto error;
i_err = SendSetup( p_this );
if ( i_err != VLC_SUCCESS )
goto error;
i_err = SendRecord( p_this );
if ( i_err != VLC_SUCCESS )
goto error;
i_err = UpdateVolume( p_this );
if ( i_err != VLC_SUCCESS )
goto error;
LogInfo( p_this );
/* Open stream connection */
p_sys->i_stream_fd = net_ConnectTCP( p_stream, p_sys->psz_host,
p_sys->i_server_port );
if ( p_sys->i_stream_fd < 0 )
{
msg_Err( p_this, "Cannot establish stream connection to %s:%d (%s)",
p_sys->psz_host, p_sys->i_server_port,
vlc_strerror_c(errno) );
i_err = VLC_EGENERIC;
goto error;
}
error:
free( psz_pwfile );
if ( i_err != VLC_SUCCESS )
FreeSys( p_this, p_sys );
return i_err;
}
/*****************************************************************************
* Close:
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
SendFlush( p_this );
SendTeardown( p_this );
FreeSys( p_this, p_sys );
}
/*****************************************************************************
* Add:
*****************************************************************************/
static sout_stream_id_sys_t *Add( sout_stream_t *p_stream, es_format_t *p_fmt )
{
sout_stream_sys_t *p_sys = p_stream->p_sys;
sout_stream_id_sys_t *id = NULL;
id = calloc( 1, sizeof( *id ) );
if ( id == NULL )
goto error;
es_format_Copy( &id->fmt, p_fmt );
switch ( id->fmt.i_cat )
{
case AUDIO_ES:
if ( id->fmt.i_codec == VLC_CODEC_ALAC )
{
if ( p_sys->p_audio_stream )
{
msg_Warn( p_stream, "Only the first Apple Lossless audio "
"stream is used" );
}
else if ( id->fmt.audio.i_rate != 44100 ||
id->fmt.audio.i_channels != 2 )
{
msg_Err( p_stream, "The Apple Lossless audio stream must be "
"encoded with 44100 Hz and 2 channels" );
}
else
{
/* Use this stream */
p_sys->p_audio_stream = id;
}
}
else if ( !p_sys->b_alac_warning )
{
msg_Err( p_stream, "Apple Lossless is the only codec supported. "
"Use the \"transcode\" module for conversion "
"(e.g. \"transcode{acodec=alac,"
"channels=2}\")." );
p_sys->b_alac_warning = true;
}
break;
default:
/* Leave other stream types alone */
break;
}
return id;
error:
FreeId( id );
return NULL;
}
/*****************************************************************************
* Del:
*****************************************************************************/
static int Del( sout_stream_t *p_stream, sout_stream_id_sys_t *id )
{
sout_stream_sys_t *p_sys = p_stream->p_sys;
int i_err = VLC_SUCCESS;
if ( p_sys->p_audio_stream == id )
p_sys->p_audio_stream = NULL;
FreeId( id );
return i_err;
}
/*****************************************************************************
* Send:
*****************************************************************************/
static int Send( sout_stream_t *p_stream, sout_stream_id_sys_t *id,
block_t *p_buffer )
{
sout_stream_sys_t *p_sys = p_stream->p_sys;
if ( id->fmt.i_cat == AUDIO_ES && id == p_sys->p_audio_stream )
{
/* SendAudio takes care of releasing the buffers */
SendAudio( p_stream, p_buffer );
}
else
{
block_ChainRelease( p_buffer );
}
return VLC_SUCCESS;
}
/*****************************************************************************
* VolumeCallback: called when the volume is changed on the fly.
*****************************************************************************/
static int VolumeCallback( vlc_object_t *p_this, char const *psz_cmd,
vlc_value_t oldval, vlc_value_t newval,
void *p_data )
{
VLC_UNUSED(psz_cmd);
VLC_UNUSED(oldval);
VLC_UNUSED(p_data);
VLC_UNUSED(newval);
sout_stream_t *p_stream = (sout_stream_t*)p_this;
sout_stream_sys_t *p_sys = p_stream->p_sys;
/* TODO: Implement volume change */
VLC_UNUSED(p_sys);
return VLC_SUCCESS;
}