mirror of
https://code.videolan.org/videolan/vlc
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175 lines
7.0 KiB
C
175 lines
7.0 KiB
C
/*****************************************************************************
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* input_netlist.h: netlist interface
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* The netlists are an essential part of the input structure. We maintain a
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* list of free TS packets and free PES packets to avoid continuous malloc
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* and free.
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*****************************************************************************
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* Copyright (C) 1998, 1999, 2000 VideoLAN
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*
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* Authors:
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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#include "intf_msg.h"
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/*****************************************************************************
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* Prototypes
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*****************************************************************************/
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int input_NetlistInit ( input_thread_t *p_input );
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void input_NetlistEnd ( input_thread_t *p_input );
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static __inline__ void input_NetlistFreePES( input_thread_t *p_input, pes_packet_t *p_pes_packet );
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static __inline__ void input_NetlistFreeTS( input_thread_t *p_input, ts_packet_t *p_ts_packet );
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static __inline__ pes_packet_t* input_NetlistGetPES( input_thread_t *p_input );
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/*****************************************************************************
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* input_NetlistFreePES: add a PES packet to the netlist
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*****************************************************************************
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* Add a PES packet to the PES netlist, so that the packet can immediately be
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* reused by the demultiplexer. We put this function directly in the .h file,
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* because it is very frequently called.
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*****************************************************************************/
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static __inline__ void input_NetlistFreePES( input_thread_t *p_input,
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pes_packet_t *p_pes_packet )
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{
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int i_dummy;
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ts_packet_t * p_ts_packet;
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ASSERT(p_pes_packet);
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/* We will be playing with indexes, so we take a lock. */
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vlc_mutex_lock( &p_input->netlist.lock );
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/* Free all TS packets in this PES structure. */
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p_ts_packet = p_pes_packet->p_first_ts;
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for( i_dummy = 0; i_dummy < p_pes_packet->i_ts_packets; i_dummy++ )
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{
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ASSERT(p_ts_packet);
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#ifdef INPUT_LIFO_TS_NETLIST
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p_input->netlist.i_ts_index--;
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p_input->netlist.p_ts_free[p_input->netlist.i_ts_index].iov_base
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= (void *)p_ts_packet;
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#else /* FIFO */
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p_input->netlist.p_ts_free[p_input->netlist.i_ts_end].iov_base
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= (void *)p_ts_packet;
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p_input->netlist.i_ts_end++;
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p_input->netlist.i_ts_end &= INPUT_MAX_TS; /* loop */
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#endif
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p_ts_packet = p_ts_packet->p_next_ts;
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}
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/* Free the PES structure. */
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#ifdef INPUT_LIFO_PES_NETLIST
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p_input->netlist.i_pes_index--;
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p_input->netlist.p_pes_free[p_input->netlist.i_pes_index] = p_pes_packet;
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#else /* FIFO */
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p_input->netlist.p_pes_free[p_input->netlist.i_pes_end] = p_pes_packet;
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p_input->netlist.i_pes_end++;
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p_input->netlist.i_pes_end &= INPUT_MAX_PES; /* loop */
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#endif
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vlc_mutex_unlock( &p_input->netlist.lock );
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}
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/*****************************************************************************
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* input_NetlistFreeTS: add a TS packet to the netlist
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*****************************************************************************
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* Add a TS packet to the TS netlist, so that the packet can immediately be
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* reused by the demultiplexer. Shouldn't be called by other threads (they
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* should only use input_FreePES.
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*****************************************************************************/
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static __inline__ void input_NetlistFreeTS( input_thread_t *p_input,
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ts_packet_t *p_ts_packet )
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{
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ASSERT(p_ts_packet);
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/* We will be playing with indexes, so we take a lock. */
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vlc_mutex_lock( &p_input->netlist.lock );
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/* Free the TS structure. */
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#ifdef INPUT_LIFO_TS_NETLIST
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p_input->netlist.i_ts_index--;
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p_input->netlist.p_ts_free[p_input->netlist.i_ts_index].iov_base
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= (void *)p_ts_packet;
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#else /* FIFO */
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p_input->netlist.p_ts_free[p_input->netlist.i_ts_end].iov_base
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= (void *)p_ts_packet;
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p_input->netlist.i_ts_end++;
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p_input->netlist.i_ts_end &= INPUT_MAX_TS; /* loop */
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#endif
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vlc_mutex_unlock( &p_input->netlist.lock );
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}
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/*****************************************************************************
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* input_NetlistGetPES: remove a PES packet from the netlist
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*****************************************************************************
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* Add a TS packet to the TS netlist, so that the packet can immediately be
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* reused by the demultiplexer. Shouldn't be called by other threads (they
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* should only use input_FreePES.
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*****************************************************************************/
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static __inline__ pes_packet_t* input_NetlistGetPES( input_thread_t *p_input )
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{
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pes_packet_t * p_pes_packet;
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#ifdef INPUT_LIFO_PES_NETLIST
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/* i_pes_index might be accessed by a decoder thread to give back a
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* packet. */
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vlc_mutex_lock( &p_input->netlist.lock );
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/* Verify that we still have PES packet in the netlist */
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if( (INPUT_MAX_PES - p_input->netlist.i_pes_index ) <= 1 )
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{
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intf_ErrMsg("input error: PES netlist is empty !\n");
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return( NULL );
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}
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/* Fetch a new PES packet */
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p_pes_packet = p_input->netlist.p_pes_free[p_input->netlist.i_pes_index];
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p_input->netlist.i_pes_index++;
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vlc_mutex_unlock( &p_input->netlist.lock );
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#else /* FIFO */
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/* No need to lock, since we are the only ones accessing i_pes_start. */
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/* Verify that we still have PES packet in the netlist */
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if( ((p_input->netlist.i_pes_end -1 - p_input->netlist.i_pes_start) & INPUT_MAX_PES) <= 1 )
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{
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intf_ErrMsg("input error: PES netlist is empty !\n");
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return( NULL );
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}
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p_pes_packet = p_input->netlist.p_pes_free[p_input->netlist.i_pes_start];
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p_input->netlist.i_pes_start++;
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p_input->netlist.i_pes_start &= INPUT_MAX_PES; /* loop */
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#endif /* netlist type */
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/* Initialize PES flags. */
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p_pes_packet->b_data_loss = 0;
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p_pes_packet->b_data_alignment = 0;
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p_pes_packet->b_has_pts = 0;
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p_pes_packet->b_random_access = 0;
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p_pes_packet->b_discard_payload = 0;
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p_pes_packet->i_pes_size = 0;
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p_pes_packet->i_pes_real_size = 0;
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p_pes_packet->i_ts_packets = 0;
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p_pes_packet->p_first_ts = NULL;
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p_pes_packet->p_last_ts = NULL;
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return( p_pes_packet );
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}
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