/*****************************************************************************
- * udp.c: raw UDP & RTP access plug-in
+ * udp.c: raw UDP & RTP input module
*****************************************************************************
- * Copyright (C) 2001, 2002 VideoLAN
- * $Id: udp.c,v 1.27 2004/01/21 10:22:31 fenrir Exp $
+ * Copyright (C) 2001-2005 the VideoLAN team
+ * $Id$
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
* Tristan Leteurtre <tooney@via.ecp.fr>
* Laurent Aimar <fenrir@via.ecp.fr>
+ * Jean-Paul Saman <jpsaman #_at_# m2x dot nl>
*
* Reviewed: 23 October 2003, Jean-Paul Saman <jpsaman@wxs.nl>
*
/*****************************************************************************
* Module descriptor
*****************************************************************************/
-#define CACHING_TEXT N_("caching value in ms")
+#define CACHING_TEXT N_("Caching value in ms")
#define CACHING_LONGTEXT N_( \
- "Allows you to modify the default caching value for udp streams. This " \
- "value should be set in miliseconds units." )
+ "Allows you to modify the default caching value for UDP streams. This " \
+ "value should be set in millisecond units." )
+
+#define AUTO_MTU_TEXT N_("Autodetection of MTU")
+#define AUTO_MTU_LONGTEXT N_( \
+ "Allows growing the MTU if truncated packets are found" )
+
+#define RTP_LATE_TEXT N_("RTP reordering timeout in ms")
+#define RTP_LATE_LONGTEXT N_( \
+ "Allows you to modify the RTP reordering behaviour. " \
+ "RTP input will wait for late packets upto " \
+ "the specified timeout in milisecond units." )
static int Open ( vlc_object_t * );
static void Close( vlc_object_t * );
vlc_module_begin();
+ set_shortname( _("UDP/RTP" ) );
set_description( _("UDP/RTP input") );
- add_category_hint( N_("UDP"), NULL , VLC_TRUE );
- add_integer( "udp-caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT, CACHING_LONGTEXT, VLC_TRUE );
- set_capability( "access", 0 );
+ set_category( CAT_INPUT );
+ set_subcategory( SUBCAT_INPUT_ACCESS );
+
+ add_integer( "udp-caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT,
+ CACHING_LONGTEXT, VLC_TRUE );
+ add_integer( "rtp-late", 100, NULL, RTP_LATE_TEXT, RTP_LATE_LONGTEXT, VLC_TRUE );
+
+ add_bool( "udp-auto-mtu", 1, NULL,
+ AUTO_MTU_TEXT, AUTO_MTU_LONGTEXT, VLC_TRUE );
+
+ set_capability( "access2", 0 );
add_shortcut( "udp" );
add_shortcut( "udpstream" );
add_shortcut( "udp4" );
*****************************************************************************/
#define RTP_HEADER_LEN 12
-static ssize_t Read ( input_thread_t *, byte_t *, size_t );
-static ssize_t RTPRead ( input_thread_t *, byte_t *, size_t );
-static ssize_t RTPChoose( input_thread_t *, byte_t *, size_t );
+static block_t *BlockUDP( access_t * );
+static block_t *BlockRTP( access_t * );
+static block_t *BlockChoose( access_t * );
+static int Control( access_t *, int, va_list );
struct access_sys_t
{
int fd;
+
+ int i_mtu;
+ vlc_bool_t b_auto_mtu;
+
+ /* reorder rtp packets when out-of-sequence */
+ mtime_t i_rtp_late;
+ uint16_t i_last_seqno;
+ block_t *p_list;
+ block_t *p_end;
};
/*****************************************************************************
*****************************************************************************/
static int Open( vlc_object_t *p_this )
{
- input_thread_t *p_input = (input_thread_t *)p_this;
- access_sys_t *p_sys;
-
- char * psz_name = strdup(p_input->psz_name);
- char * psz_parser = psz_name;
- char * psz_server_addr = "";
- char * psz_server_port = "";
- char * psz_bind_addr = "";
- char * psz_bind_port = "";
- int i_bind_port = 0, i_server_port = 0;
- vlc_value_t val;
+ access_t *p_access = (access_t*)p_this;
+ access_sys_t *p_sys;
+ char *psz_name = strdup( p_access->psz_path );
+ char *psz_parser, *psz_server_addr, *psz_bind_addr = "";
+ int i_bind_port, i_server_port = 0;
/* First set ipv4/ipv6 */
- var_Create( p_input, "ipv4", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
- var_Create( p_input, "ipv6", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
+ var_Create( p_access, "ipv4", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
+ var_Create( p_access, "ipv6", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
- if( *p_input->psz_access )
+ if( *p_access->psz_access )
{
+ vlc_value_t val;
/* Find out which shortcut was used */
- if( !strncmp( p_input->psz_access, "udp4", 6 ) || !strncmp( p_input->psz_access, "rtp4", 6 ))
+ if( !strncmp( p_access->psz_access, "udp4", 6 ) ||
+ !strncmp( p_access->psz_access, "rtp4", 6 ))
{
val.b_bool = VLC_TRUE;
- var_Set( p_input, "ipv4", val );
+ var_Set( p_access, "ipv4", val );
val.b_bool = VLC_FALSE;
- var_Set( p_input, "ipv6", val );
+ var_Set( p_access, "ipv6", val );
}
- else if( !strncmp( p_input->psz_access, "udp6", 6 ) || !strncmp( p_input->psz_access, "rtp6", 6 ) )
+ else if( !strncmp( p_access->psz_access, "udp6", 6 ) ||
+ !strncmp( p_access->psz_access, "rtp6", 6 ) )
{
val.b_bool = VLC_TRUE;
- var_Set( p_input, "ipv6", val );
+ var_Set( p_access, "ipv6", val );
val.b_bool = VLC_FALSE;
- var_Set( p_input, "ipv4", val );
+ var_Set( p_access, "ipv4", val );
}
}
+ i_bind_port = var_CreateGetInteger( p_access, "server-port" );
+
/* Parse psz_name syntax :
* [serveraddr[:serverport]][@[bindaddr]:[bindport]] */
- if( *psz_parser && *psz_parser != '@' )
+ psz_parser = strchr( psz_name, '@' );
+ if( psz_parser != NULL )
{
- /* Found server */
- psz_server_addr = psz_parser;
+ /* Found bind address and/or bind port */
+ *psz_parser++ = '\0';
+ psz_bind_addr = psz_parser;
- while( *psz_parser && *psz_parser != ':' && *psz_parser != '@' )
- {
- if( *psz_parser == '[' )
- {
- /* IPv6 address */
- while( *psz_parser && *psz_parser != ']' )
- {
- psz_parser++;
- }
- }
- psz_parser++;
- }
+ if( *psz_parser == '[' )
+ /* skips bracket'd IPv6 address */
+ psz_parser = strchr( psz_parser, ']' );
- if( *psz_parser == ':' )
+ if( psz_parser != NULL )
{
- /* Found server port */
- *psz_parser++ = '\0'; /* Terminate server name */
- psz_server_port = psz_parser;
-
- while( *psz_parser && *psz_parser != '@' )
+ psz_parser = strchr( psz_parser, ':' );
+ if( psz_parser != NULL )
{
- psz_parser++;
+ *psz_parser++ = '\0';
+ i_bind_port = atoi( psz_parser );
}
}
}
- if( *psz_parser == '@' )
- {
- /* Found bind address or bind port */
- *psz_parser++ = '\0'; /* Terminate server port or name if necessary */
-
- if( *psz_parser && *psz_parser != ':' )
- {
- /* Found bind address */
- psz_bind_addr = psz_parser;
-
- while( *psz_parser && *psz_parser != ':' )
- {
- if( *psz_parser == '[' )
- {
- /* IPv6 address */
- while( *psz_parser && *psz_parser != ']' )
- {
- psz_parser++;
- }
- }
- psz_parser++;
- }
- }
+ psz_server_addr = psz_name;
+ if( *psz_server_addr == '[' )
+ /* skips bracket'd IPv6 address */
+ psz_parser = strchr( psz_name, ']' );
- if( *psz_parser == ':' )
+ if( psz_parser != NULL )
+ {
+ psz_parser = strchr( psz_parser, ':' );
+ if( psz_parser != NULL )
{
- /* Found bind port */
- *psz_parser++ = '\0'; /* Terminate bind address if necessary */
- psz_bind_port = psz_parser;
+ *psz_parser++ = '\0';
+ i_server_port = atoi( psz_parser );
}
}
- i_server_port = strtol( psz_server_port, NULL, 10 );
- if( ( i_bind_port = strtol( psz_bind_port, NULL, 10 ) ) == 0 )
- {
- i_bind_port = config_GetInt( p_this, "server-port" );
- }
-
- if( *psz_server_addr || i_server_port )
- {
- msg_Err( p_input, "this UDP syntax is deprecated; the server argument will be");
- msg_Err( p_input, "ignored (%s:%d). If you wanted to enter a multicast address",
- psz_server_addr, i_server_port);
- msg_Err( p_input, "or local port, type : %s:@%s:%d",
- *p_input->psz_access ? p_input->psz_access : "udp",
- psz_server_addr, i_server_port );
-
- i_server_port = 0;
- psz_server_addr = "";
- }
-
- msg_Dbg( p_input, "opening server=%s:%d local=%s:%d",
+ msg_Dbg( p_access, "opening server=%s:%d local=%s:%d",
psz_server_addr, i_server_port, psz_bind_addr, i_bind_port );
- p_sys = p_input->p_access_data = malloc( sizeof( access_sys_t ) );
- if( p_sys == NULL )
- {
- msg_Err( p_input, "out of memory" );
- return VLC_EGENERIC;
- }
-
- p_sys->fd = net_OpenUDP( p_input, psz_bind_addr, i_bind_port,
+ /* Set up p_access */
+ p_access->pf_read = NULL;
+ p_access->pf_block = BlockChoose;
+ p_access->pf_control = Control;
+ p_access->pf_seek = NULL;
+ p_access->info.i_update = 0;
+ p_access->info.i_size = 0;
+ p_access->info.i_pos = 0;
+ p_access->info.b_eof = VLC_FALSE;
+ p_access->info.b_prebuffered = VLC_FALSE;
+ p_access->info.i_title = 0;
+ p_access->info.i_seekpoint = 0;
+
+ p_access->p_sys = p_sys = malloc( sizeof( access_sys_t ) );
+ p_sys->fd = net_OpenUDP( p_access, psz_bind_addr, i_bind_port,
psz_server_addr, i_server_port );
if( p_sys->fd < 0 )
{
- msg_Err( p_input, "cannot open socket" );
+ msg_Err( p_access, "cannot open socket" );
free( psz_name );
free( p_sys );
return VLC_EGENERIC;
}
free( psz_name );
- /* FIXME */
- p_input->i_mtu = config_GetInt( p_this, "mtu" );
+ net_StopSend( p_sys->fd );
- /* fill p_input fields */
- p_input->pf_read = RTPChoose;
- p_input->pf_set_program = input_SetProgram;
- p_input->pf_set_area = NULL;
- p_input->pf_seek = NULL;
+ /* FIXME */
+ p_sys->i_mtu = var_CreateGetInteger( p_access, "mtu" );
+ if( p_sys->i_mtu <= 1 )
+ p_sys->i_mtu = 1500; /* Avoid problem */
- vlc_mutex_lock( &p_input->stream.stream_lock );
- p_input->stream.b_pace_control = VLC_FALSE;
- p_input->stream.b_seekable = VLC_FALSE;
- p_input->stream.p_selected_area->i_tell = 0;
- p_input->stream.i_method = INPUT_METHOD_NETWORK;
- vlc_mutex_unlock( &p_input->stream.stream_lock );
+ p_sys->b_auto_mtu = var_CreateGetBool( p_access, "udp-auto-mtu" );;
/* Update default_pts to a suitable value for udp access */
- var_Create( p_input, "udp-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
- var_Get( p_input, "udp-caching", &val );
- p_input->i_pts_delay = val.i_int * 1000;
+ var_Create( p_access, "udp-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
+
+ /* RTP reordering for out-of-sequence packets */
+ p_sys->i_rtp_late = var_CreateGetInteger( p_access, "rtp-late" ) * 1000;
+ p_sys->i_last_seqno = 0;
+ p_sys->p_list = NULL;
+ p_sys->p_end = NULL;
return VLC_SUCCESS;
}
*****************************************************************************/
static void Close( vlc_object_t *p_this )
{
- input_thread_t *p_input = (input_thread_t *)p_this;
- access_sys_t *p_sys = p_input->p_access_data;
-
- msg_Info( p_input, "closing UDP target `%s'", p_input->psz_source );
+ access_t *p_access = (access_t*)p_this;
+ access_sys_t *p_sys = p_access->p_sys;
+ block_ChainRelease( p_sys->p_list );
net_Close( p_sys->fd );
-
free( p_sys );
}
/*****************************************************************************
- * Read: read on a file descriptor, checking b_die periodically
+ * Control:
*****************************************************************************/
-static ssize_t Read( input_thread_t * p_input, byte_t * p_buffer, size_t i_len )
+static int Control( access_t *p_access, int i_query, va_list args )
{
- access_sys_t *p_sys = p_input->p_access_data;
+ access_sys_t *p_sys = p_access->p_sys;
+ vlc_bool_t *pb_bool;
+ int *pi_int;
+ int64_t *pi_64;
- return net_Read( p_input, p_sys->fd, p_buffer, i_len, VLC_FALSE );
+ switch( i_query )
+ {
+ /* */
+ case ACCESS_CAN_SEEK:
+ case ACCESS_CAN_FASTSEEK:
+ case ACCESS_CAN_PAUSE:
+ case ACCESS_CAN_CONTROL_PACE:
+ pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
+ *pb_bool = VLC_FALSE;
+ break;
+ /* */
+ case ACCESS_GET_MTU:
+ pi_int = (int*)va_arg( args, int * );
+ *pi_int = p_sys->i_mtu;
+ break;
+
+ case ACCESS_GET_PTS_DELAY:
+ pi_64 = (int64_t*)va_arg( args, int64_t * );
+ *pi_64 = var_GetInteger( p_access, "udp-caching" ) * 1000;
+ break;
+
+ /* */
+ case ACCESS_SET_PAUSE_STATE:
+ case ACCESS_GET_TITLE_INFO:
+ case ACCESS_SET_TITLE:
+ case ACCESS_SET_SEEKPOINT:
+ case ACCESS_SET_PRIVATE_ID_STATE:
+ return VLC_EGENERIC;
+
+ default:
+ msg_Warn( p_access, "unimplemented query in control" );
+ return VLC_EGENERIC;
+
+ }
+ return VLC_SUCCESS;
}
/*****************************************************************************
- * RTPRead : read from the network, and parse the RTP header
+ * BlockUDP:
*****************************************************************************/
-static ssize_t RTPRead( input_thread_t * p_input, byte_t * p_buffer,
- size_t i_len )
+static block_t *BlockUDP( access_t *p_access )
{
- int i_rtp_version;
- int i_CSRC_count;
- int i_payload_type;
- int i_skip = 0;
-
- byte_t * p_tmp_buffer = alloca( p_input->i_mtu );
-
- /* Get the raw data from the socket.
- * We first assume that RTP header size is the classic RTP_HEADER_LEN. */
- ssize_t i_ret = Read( p_input, p_tmp_buffer, p_input->i_mtu );
-
- if ( i_ret <= 0 ) return 0; /* i_ret is at least 1 */
-
- /* Parse the header and make some verifications.
- * See RFC 1889 & RFC 2250. */
-
- i_rtp_version = ( p_tmp_buffer[0] & 0xC0 ) >> 6;
- i_CSRC_count = ( p_tmp_buffer[0] & 0x0F );
- i_payload_type = ( p_tmp_buffer[1] & 0x7F );
-
- if ( i_rtp_version != 2 )
- msg_Dbg( p_input, "RTP version is %u, should be 2", i_rtp_version );
-
- if( i_payload_type == 14 )
- {
- i_skip = 4;
- }
- else if( i_payload_type != 33 && i_payload_type != 32 )
+ access_sys_t *p_sys = p_access->p_sys;
+ block_t *p_block;
+
+ /* Read data */
+ p_block = block_New( p_access, p_sys->i_mtu );
+ p_block->i_buffer = net_Read( p_access, p_sys->fd, NULL,
+ p_block->p_buffer, p_sys->i_mtu,
+ VLC_FALSE );
+ if( p_block->i_buffer <= 0 )
{
- msg_Dbg( p_input, "unsupported RTP payload type (%u)", i_payload_type );
+ block_Release( p_block );
+ return NULL;
}
- i_skip += RTP_HEADER_LEN + 4*i_CSRC_count;
- /* A CSRC extension field is 32 bits in size (4 bytes) */
- if ( i_ret < i_skip )
+ if( (p_block->i_buffer >= p_sys->i_mtu) && p_sys->b_auto_mtu &&
+ p_sys->i_mtu < 32767 )
{
- /* Packet is not big enough to hold the complete RTP_HEADER with
- * CSRC extensions.
- */
- msg_Warn( p_input, "RTP input trashing %d bytes", i_ret - i_len );
- return 0;
+ /* Increase by 100% */
+ p_sys->i_mtu *= 2;
+ msg_Dbg( p_access, "increasing MTU to %d", p_sys->i_mtu );
}
- /* Return the packet without the RTP header. */
- i_ret -= i_skip;
+ return p_block;
+}
- if ( (size_t)i_ret > i_len )
+/*
+ * rtp_ChainInsert - insert a p_block in the chain and
+ * look at the sequence numbers.
+ */
+static inline vlc_bool_t rtp_ChainInsert( access_t *p_access, block_t *p_block )
+{
+ access_sys_t *p_sys = (access_sys_t *) p_access->p_sys;
+ block_t *p_prev = NULL;
+ block_t *p = p_sys->p_end;
+ uint16_t i_new = (uint16_t) p_block->i_dts;
+ uint16_t i_tmp = 0;
+
+ if( !p_sys->p_list )
{
- /* This should NOT happen. */
- msg_Warn( p_input, "RTP input trashing %d bytes", i_ret - i_len );
- i_ret = i_len;
+ p_sys->p_list = p_block;
+ p_sys->p_end = p_block;
+ return VLC_TRUE;
}
+ /* walk through the queue from top down since the new packet is in
+ most cases just appended to the end */
+
+ for( ;; )
+ {
+ i_tmp = i_new - (uint16_t) p->i_dts;
- p_input->p_vlc->pf_memcpy( p_buffer, &p_tmp_buffer[i_skip], i_ret );
+ if( !i_tmp ) /* trash duplicate */
+ break;
- return i_ret;
+ if ( i_tmp < 32768 )
+ { /* insert after this block ( i_new > p->i_dts ) */
+ p_block->p_next = p->p_next;
+ p->p_next = p_block;
+ p_block->p_prev = p;
+ if (p_prev)
+ {
+ p_prev->p_prev = p_block;
+ msg_Dbg(p_access, "RTP reordering: insert after %d, new %d",
+ (uint16_t) p->i_dts, i_new );
+ }
+ else
+ {
+ p_sys->p_end = p_block;
+ }
+ return VLC_TRUE;
+ }
+ if( p == p_sys->p_list )
+ { /* we've reached bottom of chain */
+ i_tmp = p_sys->i_last_seqno - i_new;
+ if( !p_access->info.b_prebuffered || (i_tmp > 32767) )
+ {
+ msg_Dbg(p_access, "RTP reordering: prepend %d before %d",
+ i_new, (uint16_t) p->i_dts );
+ p_block->p_next = p;
+ p->p_prev = p_block;
+ p_sys->p_list = p_block;
+ return VLC_TRUE;
+ }
+
+ if( !i_tmp ) /* trash duplicate */
+ break;
+
+ /* reordering failed - append the packet to the end of queue */
+ msg_Dbg(p_access, "RTP: sequence changed (or buffer too small) "
+ "new: %d, buffer %d...%d", i_new, (uint16_t) p->i_dts,
+ (uint16_t) p_sys->p_end->i_dts);
+ p_sys->p_end->p_next = p_block;
+ p_block->p_prev = p_sys->p_end;
+ p_sys->p_end = p_block;
+ return VLC_TRUE;
+ }
+ p_prev = p;
+ p = p->p_prev;
+ }
+ block_Release( p_block );
+ return VLC_FALSE;
}
/*****************************************************************************
- * RTPChoose : read from the network, and decide whether it's UDP or RTP
+ * BlockParseRTP/BlockRTP:
*****************************************************************************/
-static ssize_t RTPChoose( input_thread_t * p_input, byte_t * p_buffer,
- size_t i_len )
+static block_t *BlockParseRTP( access_t *p_access, block_t *p_block )
{
- int i_rtp_version;
- int i_CSRC_count;
- int i_payload_type;
+ int i_rtp_version;
+ int i_CSRC_count;
+ int i_payload_type;
+ int i_skip = 0;
+ int i_extension_flag = 0;
+ int i_extension_length = 0;
+ uint16_t i_sequence_number = 0;
+
+ if( p_block == NULL )
+ return NULL;
- byte_t * p_tmp_buffer = alloca( p_input->i_mtu );
+ if( p_block->i_buffer < RTP_HEADER_LEN )
+ goto trash;
- /* Get the raw data from the socket.
- * We first assume that RTP header size is the classic RTP_HEADER_LEN. */
- ssize_t i_ret = Read( p_input, p_tmp_buffer, p_input->i_mtu );
+ /* Parse the header and make some verifications.
+ * See RFC 3550. */
+ i_rtp_version = ( p_block->p_buffer[0] & 0xC0 ) >> 6;
+ i_CSRC_count = p_block->p_buffer[0] & 0x0F;
+ i_extension_flag = p_block->p_buffer[0] & 0x10;
+ i_payload_type = p_block->p_buffer[1] & 0x7F;
+ i_sequence_number = (p_block->p_buffer[2] << 8 ) + p_block->p_buffer[3];
- if ( i_ret <= 0 ) return 0; /* i_ret is at least 1 */
+ if( i_rtp_version != 2 )
+ msg_Dbg( p_access, "RTP version is %u, should be 2", i_rtp_version );
- /* Check that it's not TS. */
- if ( p_tmp_buffer[0] == 0x47 )
+ if( i_payload_type == 14 || i_payload_type == 32)
+ i_skip = 4;
+ else if( i_payload_type != 33 )
+ msg_Dbg( p_access, "unsupported RTP payload type (%u)", i_payload_type );
+ if( i_extension_flag )
+ i_extension_length = 4 +
+ 4 * ( (p_block->p_buffer[14] << 8) + p_block->p_buffer[15] );
+
+ /* Skip header + CSRC extension field n*(32 bits) + extension */
+ i_skip += RTP_HEADER_LEN + 4*i_CSRC_count + i_extension_length;
+
+ if( i_skip >= p_block->i_buffer )
+ goto trash;
+
+ /* Return the packet without the RTP header, remember seqno in i_dts */
+ p_block->i_buffer -= i_skip;
+ p_block->p_buffer += i_skip;
+ p_block->i_pts = mdate();
+ p_block->i_dts = (mtime_t) i_sequence_number;
+
+#if 0
+ /* Emulate packet loss */
+ if ( (i_sequence_number % 4000) == 0)
{
- msg_Dbg( p_input, "detected TS over raw UDP" );
- p_input->pf_read = Read;
- p_input->p_vlc->pf_memcpy( p_buffer, p_tmp_buffer, i_ret );
- return i_ret;
+ msg_Warn( p_access, "Emulating packet drop" );
+ block_Release( p_block );
+ return NULL;
}
+#endif
- /* Parse the header and make some verifications.
- * See RFC 1889 & RFC 2250. */
+ return p_block;
- i_rtp_version = ( p_tmp_buffer[0] & 0xC0 ) >> 6;
- i_CSRC_count = ( p_tmp_buffer[0] & 0x0F );
- i_payload_type = ( p_tmp_buffer[1] & 0x7F );
- if ( i_rtp_version != 2 )
- {
- msg_Dbg( p_input, "no supported RTP header detected" );
- p_input->pf_read = Read;
- p_input->p_vlc->pf_memcpy( p_buffer, p_tmp_buffer, i_ret );
- return i_ret;
- }
+trash:
+ msg_Warn( p_access, "received a too short packet for RTP" );
+ block_Release( p_block );
+ return NULL;
+}
+
+static block_t *BlockPrebufferRTP( access_t *p_access, block_t *p_block )
+{
+ access_sys_t *p_sys = p_access->p_sys;
+ mtime_t i_first = mdate();
+ int i_count = 0;
+ block_t *p = p_block;
- switch ( i_payload_type )
+ for( ;; )
{
- case 33:
- msg_Dbg( p_input, "detected TS over RTP" );
- break;
+ mtime_t i_date = mdate();
+
+ if( p && rtp_ChainInsert( p_access, p ))
+ i_count++;
- case 14:
- msg_Dbg( p_input, "detected MPEG audio over RTP" );
- if( !p_input->psz_demux || *p_input->psz_demux == '\0' )
+ /* Require at least 2 packets in the buffer */
+ if( i_count > 2 && (i_date - i_first) > p_sys->i_rtp_late )
+ break;
+
+ p = BlockParseRTP( p_access, BlockUDP( p_access ));
+ if( !p && (i_date - i_first) > p_sys->i_rtp_late )
{
- p_input->psz_demux = "mp3";
+ msg_Err( p_access, "Error in RTP prebuffering!" );
+ break;
}
- break;
+ }
- case 32:
- msg_Dbg( p_input, "detected MPEG video over RTP" );
- break;
+ msg_Dbg( p_access, "RTP: prebuffered %d packets", i_count - 1 );
+ p_access->info.b_prebuffered = VLC_TRUE;
+ p = p_sys->p_list;
+ p_sys->p_list = p_sys->p_list->p_next;
+ p_sys->i_last_seqno = (uint16_t) p->i_dts;
+ p->p_next = NULL;
+ return p;
+}
+
+static block_t *BlockRTP( access_t *p_access )
+{
+ access_sys_t *p_sys = p_access->p_sys;
+ block_t *p;
- default:
- msg_Dbg( p_input, "no RTP header detected" );
- p_input->pf_read = Read;
- p_input->p_vlc->pf_memcpy( p_buffer, p_tmp_buffer, i_ret );
- return i_ret;
+ while ( !p_sys->p_list ||
+ ( mdate() - p_sys->p_list->i_pts ) < p_sys->i_rtp_late )
+ {
+ p = BlockParseRTP( p_access, BlockUDP( p_access ));
+
+ if ( !p )
+ return NULL;
+
+ rtp_ChainInsert( p_access, p );
}
- p_input->pf_read = RTPRead;
+ p = p_sys->p_list;
+ p_sys->p_list = p_sys->p_list->p_next;
+ p_sys->i_last_seqno++;
+ if( p_sys->i_last_seqno != (uint16_t) p->i_dts )
+ {
+ msg_Dbg( p_access, "RTP: packet(s) lost, expected %d, got %d",
+ p_sys->i_last_seqno, (uint16_t) p->i_dts );
+ p_sys->i_last_seqno = (uint16_t) p->i_dts;
+ }
+ p->p_next = NULL;
+ return p;
+}
- /* A CSRC extension field is 32 bits in size (4 bytes) */
- if( i_ret < RTP_HEADER_LEN + 4*i_CSRC_count )
+/*****************************************************************************
+ * BlockChoose: decide between RTP and UDP
+ *****************************************************************************/
+static block_t *BlockChoose( access_t *p_access )
+{
+ block_t *p_block;
+ int i_rtp_version;
+ int i_CSRC_count;
+ int i_payload_type;
+
+ if( ( p_block = BlockUDP( p_access ) ) == NULL )
+ return NULL;
+
+ if( p_block->p_buffer[0] == 0x47 )
{
- /* Packet is not big enough to hold the complete RTP_HEADER with
- * CSRC extensions.
- */
- msg_Warn( p_input, "RTP input trashing %d bytes", i_ret - i_len );
- return 0;
+ msg_Dbg( p_access, "detected TS over raw UDP" );
+ p_access->pf_block = BlockUDP;
+ p_access->info.b_prebuffered = VLC_TRUE;
+ return p_block;
}
- /* Return the packet without the RTP header. */
- i_ret -= RTP_HEADER_LEN + 4*i_CSRC_count;
+ if( p_block->i_buffer < RTP_HEADER_LEN )
+ return p_block;
+
+ /* Parse the header and make some verifications.
+ * See RFC 3550. */
+
+ i_rtp_version = ( p_block->p_buffer[0] & 0xC0 ) >> 6;
+ i_CSRC_count = ( p_block->p_buffer[0] & 0x0F );
+ i_payload_type = ( p_block->p_buffer[1] & 0x7F );
+
+ if( i_rtp_version != 2 )
+ {
+ msg_Dbg( p_access, "no supported RTP header detected" );
+ p_access->pf_block = BlockUDP;
+ p_access->info.b_prebuffered = VLC_TRUE;
+ return p_block;
+ }
- if ( (size_t)i_ret > i_len )
+ switch( i_payload_type )
{
- /* This should NOT happen. */
- msg_Warn( p_input, "RTP input trashing %d bytes", i_ret - i_len );
- i_ret = i_len;
+ case 33:
+ msg_Dbg( p_access, "detected TS over RTP" );
+ p_access->psz_demux = strdup( "ts" );
+ break;
+
+ case 14:
+ msg_Dbg( p_access, "detected MPEG audio over RTP" );
+ p_access->psz_demux = strdup( "mpga" );
+ break;
+
+ case 32:
+ msg_Dbg( p_access, "detected MPEG video over RTP" );
+ p_access->psz_demux = strdup( "mpgv" );
+ break;
+
+ default:
+ msg_Dbg( p_access, "no RTP header detected" );
+ p_access->pf_block = BlockUDP;
+ p_access->info.b_prebuffered = VLC_TRUE;
+ return p_block;
}
- p_input->p_vlc->pf_memcpy( p_buffer, &p_tmp_buffer[RTP_HEADER_LEN + 4*i_CSRC_count], i_ret );
+ if( !BlockParseRTP( p_access, p_block )) return NULL;
+
+ p_access->pf_block = BlockRTP;
- return i_ret;
+ return BlockPrebufferRTP( p_access, p_block );
}