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Commit eeab96f1 authored by Jean-Paul Saman's avatar Jean-Paul Saman
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Several RTP reordering fixes (Thanks to Marian Durkovic for finding them)

parent 2cf38dd9
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Showing with 41 additions and 27 deletions
modules/access/udp.c
View file @ eeab96f1
......@@ -110,7 +110,7 @@ struct access_sys_t
uint32_t i_rtp_late; /* number of ms an RTP packet may be too late*/
uint32_t i_last_pcr; /* last known good PCR */
block_t *p_list; /* list of packets to rearrange */
block_t *p_end; /* last packet in p_list */
block_t *p_end; /* last packet in p_list */
block_t *p_next; /* p_next ?? */
};
......@@ -376,19 +376,17 @@ static inline void rtp_ChainInsert( access_t *p_access, block_t **pp_list, block
p = *pp_end;
i_cur = ( (p->p_buffer[2] << 8 ) + p->p_buffer[3] );
i_expected = ((i_cur+1) % RTP_SEQ_NUM_SIZE);
if( i_new == i_expected ) /* Append at the end? */
if( (i_new - i_expected) >= 0 ) /* Append at the end? */
{
msg_Dbg( p_access, ">> append %p(%u)==%p(%u)\n", p_block, i_cur, p, i_new );
p->p_next = *pp_end = p_block;
return;
}
/* Add to the fron fo the chain? */
/* Add to the front fo the chain? */
p = *pp_list;
i_new = ( (p_block->p_buffer[2] << 8 ) + p_block->p_buffer[3] );
i_cur = ( (p->p_buffer[2] << 8 ) + p->p_buffer[3] );
i_expected = ((i_cur+1) % RTP_SEQ_NUM_SIZE);
if( i_expected > i_new )
if( (i_cur - i_new) > 0 )
{
msg_Dbg( p_access, ">> prepend %p(%u)==%p(%u)\n", p_block, i_cur, p, i_new );
p_block->p_next = p;
......@@ -398,7 +396,7 @@ static inline void rtp_ChainInsert( access_t *p_access, block_t **pp_list, block
/* The packet can't be added to the front or the end of the chain,
* thus walk the chain from the start.
*/
while( p->p_next )
while( p )
{
i_cur = (p->p_buffer[2] << 8 ) + p->p_buffer[3];
i_expected = (i_cur+1) % RTP_SEQ_NUM_SIZE;
......@@ -421,7 +419,7 @@ static inline void rtp_ChainInsert( access_t *p_access, block_t **pp_list, block
* else if( i_pcr_cur < i_pcr_new ) */
break;
}
else if( i_expected == i_new ) /* insert in chain */
else if( (i_expected - i_new) >= 0 ) /* insert in chain */
{
p_tmp = p->p_next;
msg_Dbg( p_access, ">> insert between %p(%u)==%p(%u)", p, i_cur, p_tmp, i_new );
......@@ -449,21 +447,34 @@ static inline block_t *rtp_ChainSend( access_t *p_access, block_t **pp_list, uin
int i_extension_bit = 0;
int i_extension_length = 0;
int i_CSRC_count = 0;
int i_payload_type = 0;
uint32_t i_pcr_prev = 0;
uint16_t i_seq_prev = 0;
/* Data pointers */
block_t *p_prev = NULL;
block_t *p_send = *pp_list;
block_t *p = *pp_list;
while( p->p_next )
while( p )
{
i_cur = ( (p->p_buffer[2] << 8 ) + p->p_buffer[3] );
msg_Dbg( p_access, "rtp_ChainSend: i_cur %u, i_seq %u", i_cur, i_seq );
if( i_cur == i_seq )
if( (i_cur - i_seq) == 0 )
{
/* sent all packets that are received in order */
i_seq++;
i_seq++; /* sent all packets that are received in order */
/* Remember PCR and sequence number of packet
* for next iteration */
i_pcr_prev = ( (p->p_buffer[4] << 24) +
(p->p_buffer[5] << 16) +
(p->p_buffer[6] << 8) +
p->p_buffer[7] );
i_seq_prev = ( (p->p_buffer[2] << 8 ) +
p->p_buffer[3] );
/* Parse headerfields we need */
i_CSRC_count = p->p_buffer[0] & 0x0F;
i_payload_type = (p->p_buffer[1] & 0x7F);
i_extension_bit = ( p->p_buffer[0] & 0x10 ) >> 4;
if ( i_extension_bit == 1)
i_extension_length = ( (p->p_buffer[14] << 8 ) +
......@@ -471,23 +482,20 @@ static inline block_t *rtp_ChainSend( access_t *p_access, block_t **pp_list, uin
/* Skip header + CSRC extension field n*(32 bits) + extention */
i_skip = RTP_HEADER_LEN + 4*i_CSRC_count + i_extension_length;
if( i_payload_type == 14 ) i_skip += 4;
/* Return the packet without the RTP header. */
p->i_buffer -= i_skip;
p->p_buffer += i_skip;
}
else if( i_cur > i_seq )
else if( (i_cur - i_seq) > 0)
{
if( p_prev )
{
*pp_list = p;
p_prev->p_next = NULL;
p_sys->i_last_pcr = ( (p_prev->p_buffer[4] << 24) +
(p_prev->p_buffer[5] << 16) +
(p_prev->p_buffer[6] << 8) +
p_prev->p_buffer[7] );
p_sys->i_sequence_number = ( (p_prev->p_buffer[2] << 8 ) +
p_prev->p_buffer[3] );
p_sys->i_last_pcr = i_pcr_prev;
p_sys->i_sequence_number = i_seq_prev;
return p_send;
}
/* FiXME: or should we return NULL here? */
......@@ -500,6 +508,7 @@ static inline block_t *rtp_ChainSend( access_t *p_access, block_t **pp_list, uin
/* We have walked through the complete chain and all packets are
* in sequence - so send the whole chain
*/
i_payload_type = (p->p_buffer[1] & 0x7F);
i_CSRC_count = p->p_buffer[0] & 0x0F;
i_extension_bit = ( p->p_buffer[0] & 0x10 ) >> 4;
if( i_extension_bit == 1)
......@@ -507,6 +516,7 @@ static inline block_t *rtp_ChainSend( access_t *p_access, block_t **pp_list, uin
/* Skip header + CSRC extension field n*(32 bits) + extention */
i_skip = RTP_HEADER_LEN + 4*i_CSRC_count + i_extension_length;
if( i_payload_type == 14 ) i_skip += 4;
/* Update the list pointers */
*pp_list = NULL;
......@@ -591,7 +601,7 @@ static block_t *BlockParseRTP( access_t *p_access, block_t *p_block )
*/
if( p_sys->b_first_seqno )
{
p_sys->i_sequence_number = i_sequence_number;
p_sys->i_sequence_number = i_sequence_number-1;
p_sys->i_last_pcr = i_pcr;
p_sys->b_first_seqno = VLC_FALSE;
}
......@@ -605,18 +615,21 @@ static block_t *BlockParseRTP( access_t *p_access, block_t *p_block )
}
#endif
i_sequence_expected = ((p_sys->i_sequence_number + 1) % RTP_SEQ_NUM_SIZE);
if( i_sequence_expected != i_sequence_number )
if( (i_sequence_expected - i_sequence_number) != 0 )
{
/* Handle out of order packets */
if( p_sys->i_rtp_late > 0 )
{
if( i_sequence_expected < i_sequence_number )
if( (i_sequence_number - i_sequence_expected) > 0 )
{
msg_Warn( p_access,
"RTP packet out of order (too early) expected %u, current %u",
i_sequence_expected, i_sequence_number );
if( (i_pcr - p_sys->i_last_pcr) > (p_sys->i_rtp_late*90) )
{
block_t *p_start = p_sys->p_list;
uint16_t i_start = (p_start->p_buffer[2] << 8) +
p_start->p_buffer[3];
/* Gap too big, we have been holding this data for too long,
* send what we have.
*/
......@@ -624,13 +637,13 @@ static block_t *BlockParseRTP( access_t *p_access, block_t *p_block )
"Gap too big resyncing: delta %u, held for %d ms",
(i_pcr - p_sys->i_last_pcr), p_sys->i_rtp_late );
rtp_ChainInsert( p_access, &p_sys->p_list, &p_sys->p_end, p_block );
return rtp_ChainSend( p_access, &p_sys->p_list, i_sequence_expected );
return rtp_ChainSend( p_access, &p_sys->p_list, i_start );
}
/* hold packets that arrive too early. */
rtp_ChainInsert( p_access, &p_sys->p_list, &p_sys->p_end, p_block );
return rtp_ChainSend( p_access, &p_sys->p_list, p_sys->i_sequence_number );
return rtp_ChainSend( p_access, &p_sys->p_list, i_sequence_expected );
}
else if( /* (i_sequence_expected > i_sequence_number ) && */
else if( /* ((i_sequence_expected - i_sequence_number ) > 0) && */
(i_pcr <= p_sys->i_last_pcr) )
{
msg_Warn( p_access,
......@@ -659,10 +672,11 @@ static block_t *BlockParseRTP( access_t *p_access, block_t *p_block )
/* Return the packet without the RTP header. */
p = *p_send;
while( p->p_next )
while( p )
{
p->i_buffer -= i_skip;
p->p_buffer += i_skip;
if( !p->p_next ) break;
p = p->p_next;
}
return *p_send;
......
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