- if( (p_block->i_buffer >= p_sys->i_mtu) && p_sys->b_auto_mtu &&
- p_sys->i_mtu < 32767 )
- {
- /* Increase by 100% */
- p_sys->i_mtu *= 2;
- msg_Dbg( p_access, "increasing MTU to %d", p_sys->i_mtu );
- }
-
- return p_block;
-}
-
-/*
- * 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 )
- {
- 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;
-
- if( !i_tmp ) /* trash duplicate */
- break;
-
- 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;
-}
-
-/*****************************************************************************
- * BlockParseRTP/BlockRTP:
- *****************************************************************************/
-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_skip = 0;
- int i_extension_flag = 0;
- int i_extension_length = 0;
- uint16_t i_sequence_number = 0;
-
- if( p_block == NULL )
- return NULL;
-
- if( p_block->i_buffer < RTP_HEADER_LEN )
- goto trash;
-
- /* 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_rtp_version != 2 )
- msg_Dbg( p_access, "RTP version is %u, should be 2", i_rtp_version );
-
- 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)