input.c 56.9 KB
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/*****************************************************************************
 * input.c: input thread
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 * Read an MPEG2 stream, demultiplex and parse it before sending it to
 * decoders.
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 *****************************************************************************
 * Copyright (C) 1998, 1999, 2000 VideoLAN
 *
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 * Authors: Christophe Massiot <massiot@via.ecp.fr>
 *          Benot Steiner <benny@via.ecp.fr>
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (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,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * 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
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
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 *****************************************************************************/
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/*****************************************************************************
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 * Preamble
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 *****************************************************************************/
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#include "defs.h"

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#include <errno.h>                                                  /* errno */
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#include <sys/types.h>                        /* on BSD, uio.h needs types.h */
#include <sys/uio.h>                                            /* "input.h" */
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#include <string.h>                                            /* strerror() */
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#include <stdlib.h>                                                /* free() */
#include <netinet/in.h>                                           /* ntohs() */
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#include "config.h"
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#include "common.h"
#include "threads.h"
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#include "mtime.h"
#include "intf_msg.h"
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#include "plugins.h"
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#include "debug.h"

#include "input.h"
#include "input_psi.h"
#include "input_pcr.h"
#include "input_netlist.h"
#include "decoder_fifo.h"
#include "input_file.h"
#include "input_network.h"

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#include "audio_output.h"                                   /* aout_thread_t */
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#include "audio_decoder.h"        /* audiodec_t (for audio_decoder_thread.h) */
#include "audio_decoder_thread.h"                           /* adec_thread_t */
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#include "ac3_decoder.h"              /* ac3dec_t (for ac3_decoder_thread.h) */
#include "ac3_decoder_thread.h"                           /* ac3dec_thread_t */

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#include "lpcm_decoder.h"
#include "lpcm_decoder_thread.h"

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#include "video.h"                          /* picture_t (for video_output.h) */
#include "video_output.h"                                   /* vout_thread_t */

#include "vdec_idct.h"                     /* dctelem_t (for video_parser.h) */
#include "vdec_motion.h"                  /* f_motion_t (for video_parser.h) */
#include "vpar_blocks.h"                /* macroblock_t (for video_parser.h) */
#include "vpar_headers.h"                 /* sequence_t (for video_parser.h) */
#include "vpar_synchro.h"            /* video_synchro_t (for video_parser.h) */
#include "video_parser.h"                                   /* vpar_thread_t */

#include "spu_decoder.h"                                  /* spudec_thread_t */
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#include "main.h"
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/*****************************************************************************
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 * Local prototypes
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 *****************************************************************************/
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static void RunThread   ( input_thread_t *p_input );
static void ErrorThread ( input_thread_t *p_input );
static void EndThread   ( input_thread_t *p_input );

static __inline__ int   input_ReadPacket( input_thread_t *p_input );
static __inline__ void  input_SortPacket( input_thread_t *p_input,
                                          ts_packet_t *ts_packet );
static __inline__ void  input_DemuxTS( input_thread_t *p_input,
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                                       ts_packet_t *ts_packet,
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                                       es_descriptor_t *es_descriptor );
static __inline__ void  input_DemuxPES( input_thread_t *p_input,
                                        ts_packet_t *ts_packet,
                                        es_descriptor_t *p_es_descriptor,
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                                        boolean_t b_unit_start,
                                        boolean_t b_packet_lost );
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static __inline__ void  input_ParsePES( input_thread_t *p_input,
                                        es_descriptor_t *p_es_descriptor );
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static __inline__ void  input_DemuxPSI( input_thread_t *p_input,
                                        ts_packet_t *ts_packet,
                                        es_descriptor_t *p_es_descriptor,
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                                        boolean_t b_unit_start,
                                        boolean_t b_packet_lost );
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/*****************************************************************************
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 * input_CreateThread: creates a new input thread
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 *****************************************************************************
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 * This function creates a new input, and returns a pointer
 * to its description. On error, it returns NULL.
 * If pi_status is NULL, then the function will block until the thread is ready.
 * If not, it will be updated using one of the THREAD_* constants.
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 *****************************************************************************/
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input_thread_t *input_CreateThread ( int i_method, void *p_source, int i_port,
                                     int i_vlan, p_vout_thread_t p_vout,
                                     p_aout_thread_t p_aout, int *pi_status )
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{
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    input_thread_t *    p_input;                        /* thread descriptor */
    int                 i_status;                           /* thread status */
    int                 i_index;          /* index for tables initialization */

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    /* Allocate descriptor */
    intf_DbgMsg("\n");
    p_input = (input_thread_t *)malloc( sizeof(input_thread_t) );
    if( p_input == NULL )
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    {
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        intf_ErrMsg("error: %s\n", strerror(ENOMEM));
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        return( NULL );
    }
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    /* Initialize thread properties */
    p_input->b_die              = 0;
    p_input->b_error            = 0;
    p_input->pi_status          = (pi_status != NULL) ? pi_status : &i_status;
    *p_input->pi_status         = THREAD_CREATE;

    /* Initialize input method description */
    p_input->i_method           = i_method;
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    p_input->p_source           = p_source;
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    p_input->i_port             = i_port;
    p_input->i_vlan             = i_vlan;
    switch( i_method )
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    {
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    case INPUT_METHOD_TS_FILE:                               /* file methods */
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        p_input->p_Open =   input_FileOpen;
        p_input->p_Read =   input_FileRead;
        p_input->p_Close =  input_FileClose;
        break;
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    case INPUT_METHOD_TS_VLAN_BCAST:                  /* vlan network method */
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        if( !p_main->b_vlans )
        {
            intf_ErrMsg("error: vlans are not activated\n");
            free( p_input );
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            return( NULL );
        }
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        /* ... pass through */
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    case INPUT_METHOD_TS_UCAST:                           /* network methods */
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    case INPUT_METHOD_TS_MCAST:
    case INPUT_METHOD_TS_BCAST:
        p_input->p_Open =   input_NetworkOpen;
        p_input->p_Read =   input_NetworkRead;
        p_input->p_Close =  input_NetworkClose;
        break;
    default:
        intf_ErrMsg("error: unknow input method\n");
        free( p_input );
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        return( NULL );
        break;
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    }

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    /* Initialize stream description */
    for( i_index = 0; i_index < INPUT_MAX_ES; i_index++ )
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    {
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        p_input->p_es[i_index].i_id = EMPTY_PID;
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        p_input->pp_selected_es[i_index] = NULL;
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    }
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    /* Initialize default settings for spawned decoders */
    p_input->p_aout                     = p_aout;
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    p_input->p_vout                     = p_vout;
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#ifdef STATS
    /* Initialize statistics */
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    p_input->c_loops                    = 0;
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    p_input->c_bytes                    = 0;
    p_input->c_payload_bytes            = 0;
    p_input->c_packets_read             = 0;
    p_input->c_packets_trashed          = 0;
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#endif

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    /* Initialize PSI and PCR decoders */
    if( input_PsiInit( p_input ) )
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    {
        free( p_input );
        return( NULL );
    }

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    if( input_PcrInit( p_input ) )
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    {
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        input_PsiEnd( p_input );
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        free( p_input );
        return( NULL );
    }

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    /* Initialize netlists */
    if( input_NetlistInit( p_input ) )
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    {
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        input_PsiEnd( p_input );
        input_PcrEnd( p_input );
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        free( p_input );
        return( NULL );
    }

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    intf_DbgMsg("configuration: method=%d, source=%s, port=%d, vlan=%d\n",
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                i_method, p_source, i_port, i_vlan );
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    /* Let the appropriate method open the socket. */
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    if( p_input->p_Open( p_input ) )
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    {
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        input_NetlistEnd( p_input );
        input_PsiEnd( p_input );
        input_PcrEnd( p_input );
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        free( p_input );
        return( NULL );
    }

    /* Create thread and set locks. */
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    vlc_mutex_init( &p_input->netlist.lock );
    vlc_mutex_init( &p_input->programs_lock );
    vlc_mutex_init( &p_input->es_lock );
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    if( vlc_thread_create(&p_input->thread_id, "input", (void *) RunThread, (void *) p_input) )
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    {
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        intf_ErrMsg("error: %s\n", strerror(errno) );
        p_input->p_Close( p_input );
        input_NetlistEnd( p_input );;
        input_PsiEnd( p_input );
        input_PcrEnd( p_input );
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        free( p_input );
        return( NULL );
    }
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    intf_Msg("Input initialized\n");
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    /* If status is NULL, wait until the thread is created */
    if( pi_status == NULL )
    {
        do
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        {
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            msleep( THREAD_SLEEP );
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        }while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
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                && (i_status != THREAD_FATAL) );
        if( i_status != THREAD_READY )
        {
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            return( NULL );
        }
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    }
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    return( p_input );
}

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/*****************************************************************************
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 * input_DestroyThread: mark an input thread as zombie
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 *****************************************************************************
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 * This function should not return until the thread is effectively cancelled.
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 *****************************************************************************/
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void input_DestroyThread( input_thread_t *p_input, int *pi_status )
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{
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    int         i_status;                                   /* thread status */
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    /* Set status */
    p_input->pi_status = (pi_status != NULL) ? pi_status : &i_status;
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    *p_input->pi_status = THREAD_DESTROY;

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    /* Request thread destruction */
    p_input->b_die = 1;
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    /* If status is NULL, wait until thread has been destroyed */
    if( pi_status == NULL )
    {
        do
        {
            msleep( THREAD_SLEEP );
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        }while( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
                && (i_status != THREAD_FATAL) );
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    }
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}

#if 0
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/*****************************************************************************
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 * input_OpenAudioStream: open an audio stream
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 *****************************************************************************
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 * This function spawns an audio decoder and plugs it on the audio output
 * thread.
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 *****************************************************************************/
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int input_OpenAudioStream( input_thread_t *p_input, int i_id )
{
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    /* XXX?? */
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}

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/*****************************************************************************
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 * input_CloseAudioStream: close an audio stream
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 *****************************************************************************
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 * This function destroys an audio decoder.
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 *****************************************************************************/
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void input_CloseAudioStream( input_thread_t *p_input, int i_id )
{
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    /* XXX?? */
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}

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/*****************************************************************************
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 * input_OpenVideoStream: open a video stream
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 *****************************************************************************
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 * This function spawns a video decoder and plugs it on a video output thread.
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 *****************************************************************************/
int input_OpenVideoStream( input_thread_t *p_input,
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                           struct vout_thread_s *p_vout, struct video_cfg_s * p_cfg )
{
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    /* XXX?? */
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}

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/*****************************************************************************
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 * input_CloseVideoStream: close a video stream
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 *****************************************************************************
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 * This function destroys an video decoder.
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 *****************************************************************************/
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void input_CloseVideoStream( input_thread_t *p_input, int i_id )
{
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    /* XXX?? */
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}
#endif

/* following functions are local */

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/*****************************************************************************
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 * InitThread: initialize input thread
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 *****************************************************************************
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 * This function is called from RunThread and performs the second step of the
 * initialization. It returns 0 on success. Note that the thread's flag are not
 * modified inside this function.
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 *****************************************************************************/
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static int InitThread( input_thread_t *p_input )
{
    /* Mark thread as running and return */
    intf_DbgMsg("\n");
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    *p_input->pi_status =        THREAD_READY;
    intf_DbgMsg("thread ready\n");
    return( 0 );
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}

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/*****************************************************************************
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 * input_DemuxPSI:
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 *****************************************************************************
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 * Notice that current ES state has been locked by input_SortPacket.
 * (No more true, changed by benny - FIXME: See if it's ok, and definitely
 * change the code ?? )
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 *****************************************************************************/
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static __inline__ void input_DemuxPSI( input_thread_t *p_input,
                                       ts_packet_t *p_ts_packet,
                                       es_descriptor_t *p_es_descriptor,
                                       boolean_t b_unit_start,
                                       boolean_t b_packet_lost )
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{
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    int i_data_offset;    /* Offset of the interesting data in the TS packet */
    u16 i_data_length;                               /* Length of those data */
  //boolean_t b_first_section;         /* another section in the TS packet ? */

    ASSERT(p_input);
    ASSERT(p_ts_packet);
    ASSERT(p_es_descriptor);

#define p_psi (p_es_descriptor->p_psi_section)

    //intf_DbgMsg( "input debug: PSI demultiplexing %p (%p)\n", p_ts_packet, p_input);

    //intf_DbgMsg( "Packet: %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x %x (unit start: %d)\n", p_ts_packet->buffer[p_ts_packet->i_payload_start], p_ts_packet->buffer[p_ts_packet->i_payload_start+1], p_ts_packet->buffer[p_ts_packet->i_payload_start+2], p_ts_packet->buffer[p_ts_packet->i_payload_start+3], p_ts_packet->buffer[p_ts_packet->i_payload_start+4], p_ts_packet->buffer[p_ts_packet->i_payload_start+5], p_ts_packet->buffer[p_ts_packet->i_payload_start+6], p_ts_packet->buffer[p_ts_packet->i_payload_start+7], p_ts_packet->buffer[p_ts_packet->i_payload_start+8], p_ts_packet->buffer[p_ts_packet->i_payload_start+9], p_ts_packet->buffer[p_ts_packet->i_payload_start+10], p_ts_packet->buffer[p_ts_packet->i_payload_start+11], p_ts_packet->buffer[p_ts_packet->i_payload_start+12], p_ts_packet->buffer[p_ts_packet->i_payload_start+13], p_ts_packet->buffer[p_ts_packet->i_payload_start+14], p_ts_packet->buffer[p_ts_packet->i_payload_start+15], p_ts_packet->buffer[p_ts_packet->i_payload_start+16], p_ts_packet->buffer[p_ts_packet->i_payload_start+17], p_ts_packet->buffer[p_ts_packet->i_payload_start+18], p_ts_packet->buffer[p_ts_packet->i_payload_start+19], p_ts_packet->buffer[p_ts_packet->i_payload_start+20], b_unit_start);


    /* Try to find the beginning of the payload in the packet to initialise
     * the do-while loop that follows -> Compute the i_data_offset variable:
     * by default, the value is set so that we won't enter in the while loop.
     * It will be set to a correct value if the data are not corrupted */
    i_data_offset = TS_PACKET_SIZE;

    /* Has the reassembly of a section already begun in a previous packet ? */
    if( p_psi->b_running_section )
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    {
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        /* Was data lost since the last TS packet ? */
        if( b_packet_lost )
        {
            /* Discard the packet and wait for the begining of a new one
             * to resynch */
            p_psi->b_running_section = 0;
            p_psi->i_current_position = 0;
            intf_DbgMsg( "PSI section(s) discarded due to packet loss\n" );
        }
        else
        {
            /* The data that complete a previously began section are always at
             * the beginning of the TS payload... */
            i_data_offset = p_ts_packet->i_payload_start;
            /* ...Unless there is a pointer field, that we have to bypass */
            if( b_unit_start )
                i_data_offset++;
            //intf_DbgMsg( "New part of the section received at offset %d\n", i_data_offset );
        }
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    }
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    /* We are looking for the beginning of a new section */
    else
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    {
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        if( b_unit_start )
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        {
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            /* Get the offset at which the data for that section can be found
             * The offset is stored in the pointer_field since we are
             * interested in the first section of the TS packet. Note that
             * the +1 is to bypass the pointer field */
            i_data_offset = p_ts_packet->i_payload_start +
                            p_ts_packet->buffer[p_ts_packet->i_payload_start] + 1;
            //intf_DbgMsg( "New section beginning at offset %d in TS packet\n", i_data_offset );
        }
        else
        {
            /* This may either mean that the TS is bad or that the packet
             * contains the end of a section that had been discarded in a
             * previous loop: trash the TS packet since we cannot do
             * anything with those data: */
            p_psi->b_running_section = 0;
            p_psi->i_current_position = 0;
            intf_DbgMsg( "PSI packet discarded due to lack of synchronisation\n" );
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        }
    }

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    /* The section we will deal with during the first iteration of the
     * following loop is the first one contained in the TS packet */
    //    b_first_section = 1;

    /* Reassemble the pieces of sections contained in the TS packet and
     * decode the sections that could have been completed.
     * Stop when we reach the end of the packet or stuffing bytes */
    while( i_data_offset < TS_PACKET_SIZE && p_ts_packet->buffer[i_data_offset] != 0xFF )
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    {
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        /* If the current section is a new one, reinit the data fields of
         * the p_psi struct to start its decoding */
        if( !p_psi->b_running_section )
        {
            /* Read the length of the new section */
            p_psi->i_length = (U16_AT(&p_ts_packet->buffer[i_data_offset+1]) & 0xFFF) + 3;
            //intf_DbgMsg( "Section length %d\n", p_psi->i_length );
            if( p_psi->i_length > PSI_SECTION_SIZE )
            {
                /* The TS packet is corrupted, stop here to avoid possible
                 * a seg fault */
                intf_DbgMsg( "PSI Section size is too big, aborting its reception\n" );
                break;
            }
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            /* Init the reassembly of that section */
            p_psi->b_running_section = 1;
            p_psi->i_current_position = 0;
        }
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      /* Compute the length of data related to the section in this TS packet */
        if( p_psi->i_length - p_psi->i_current_position > TS_PACKET_SIZE - i_data_offset)
            i_data_length = TS_PACKET_SIZE - i_data_offset;
        else
          i_data_length = p_psi->i_length - p_psi->i_current_position;
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        /* Copy those data in the section buffer */
        memcpy( &p_psi->buffer[p_psi->i_current_position], &p_ts_packet->buffer[i_data_offset],
                i_data_length );
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        /* Interesting data are now after the ones we copied, since no gap is
         * allowed between 2 sections in a TS packets */
        i_data_offset += i_data_length;
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        /* Decode the packet if it is now complete */
        if (p_psi->i_length == p_psi->i_current_position + i_data_length)
        {
            /* Packet is complete, decode it */
            //intf_DbgMsg( "SECTION COMPLETE: starting decoding of its data\n" );
            input_PsiDecode( p_input, p_psi );
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            /* Prepare the buffer to receive a new section */
            p_psi->i_current_position = 0;
            p_psi->b_running_section = 0;
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            /* The new section won't be the first anymore */
            //b_first_section = 0;
        }
        else
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        {
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            /* Prepare the buffer to receive the next part of the section */
          p_psi->i_current_position += i_data_length;
          //intf_DbgMsg( "Section not complete, waiting for the end\n" );
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        }
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        //intf_DbgMsg( "Must loop ? Next data offset: %d, stuffing: %d\n",
        //             i_data_offset, p_ts_packet->buffer[i_data_offset] );
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    }

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    /* Relase the TS packet, we don't need it anymore */
    input_NetlistFreeTS( p_input, p_ts_packet );
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#undef p_psi
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}

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/*****************************************************************************
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 * input_ParsePES
 *****************************************************************************
 * Parse a finished PES packet and analyze its header.
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 *****************************************************************************/
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static __inline__ void input_ParsePES( input_thread_t *p_input,
                                       es_descriptor_t *p_es_descriptor )
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{
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    decoder_fifo_t *            p_fifo;
    u8                          i_pes_header_size;
    ts_packet_t *               p_ts;
    int                         i_ts_payload_size;
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#define p_pes (p_es_descriptor->p_pes_packet)
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    //intf_DbgMsg("End of PES packet %p\n", p_pes);
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    /* First read the 6 header bytes common to all PES packets:
       use them to test the PES validity */
    if( (p_pes->p_pes_header[0] || p_pes->p_pes_header[1] ||
        (p_pes->p_pes_header[2] != 1)) ||
                                 /* packet_start_code_prefix != 0x000001 */
        ((p_pes->i_pes_real_size) &&
         (p_pes->i_pes_real_size != p_pes->i_pes_size)) )
               /* PES_packet_length is set and != total received payload */
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    {
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      /* Trash the packet and set p_pes to NULL to be sure the next PES
         packet will have its b_data_lost flag set */
      intf_DbgMsg("Corrupted PES packet (size doesn't match) : trashed\n");
      input_NetlistFreePES( p_input, p_pes );
      p_pes = NULL;
      /* Stats XXX?? */
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    }
    else
    {
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        /* The PES packet is valid. Check its type to test if it may
           carry additional informations in a header extension */
        p_pes->i_stream_id =  p_pes->p_pes_header[3];
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        switch( p_pes->i_stream_id )
        {
        case 0xBE:  /* Padding */
        case 0xBC:  /* Program stream map */
        case 0xBF:  /* Private stream 2 */
        case 0xB0:  /* ECM */
        case 0xB1:  /* EMM */
        case 0xFF:  /* Program stream directory */
        case 0xF2:  /* DSMCC stream */
        case 0xF8:  /* ITU-T H.222.1 type E stream */
            /* The payload begins immediatly after the 6 bytes header, so
               we have finished with the parsing */
            i_pes_header_size = 6;
            break;
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        default:
            switch( p_pes->p_pes_header[8] & 0xc0 )
            {
              case 0x80: /* MPEG2: 10xx xxxx */
              case 0x00: /* FIXME: This shouldn't be allowed !! */
                /* The PES header contains at least 3 more bytes: parse them */
                p_pes->b_data_alignment = p_pes->p_pes_header[6] & 0x04;
                p_pes->b_has_pts = p_pes->p_pes_header[7] & 0x80;
                i_pes_header_size = p_pes->p_pes_header[8] + 9;
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                /* Now parse the optional header extensions (in the limit of
                   the 14 bytes */
                if( p_pes->b_has_pts )
                {
                    pcr_descriptor_t * p_pcr;
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                    p_pcr = p_input->p_pcr;
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                    p_pes->i_pts =
                        ( ((mtime_t)(p_pes->p_pes_header[9] & 0x0E) << 29) |
                          (((mtime_t)U16_AT(p_pes->p_pes_header + 10) << 14) - (1 << 14)) |
                          ((mtime_t)U16_AT(p_pes->p_pes_header + 12) >> 1) ) * 300;
                    p_pes->i_pts /= 27;
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                    if( p_pcr->i_synchro_state )
                    {
                        switch( p_pcr->i_synchro_state )
                        {
                            case SYNCHRO_NOT_STARTED:
                                p_pes->b_has_pts = 0;
                                break;
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                            case SYNCHRO_START:
                                p_pes->i_pts += p_pcr->delta_pcr;
                                p_pcr->delta_absolute = mdate() - p_pes->i_pts + INPUT_PTS_DELAY;
                                p_pes->i_pts += p_pcr->delta_absolute;
                                p_pcr->i_synchro_state = 0;
                                break;
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                            case SYNCHRO_REINIT: /* We skip a PES */
                                p_pes->b_has_pts = 0;
                                p_pcr->i_synchro_state = SYNCHRO_START;
                                break;
                        }
                    }
                    else
                    {
                        p_pes->i_pts += p_pcr->delta_pcr + p_pcr->delta_absolute;
                    }
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                }
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                break;

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            default: /* MPEG1 or some strange thing */
                /* since this isn't supported yet, we certainly gonna crash */
                intf_ErrMsg( "FIXME: unknown PES type %.2x\n",
                             p_pes->p_pes_header[8] );
                i_pes_header_size = 6;
                break;
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            }
            break;
        }
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        /* Now we've parsed the header, we just have to indicate in some
         * specific TS packets where the PES payload begins (renumber
         * i_payload_start), so that the decoders can find the beginning
         * of their data right out of the box. */
        p_ts = p_pes->p_first_ts;
        i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
        while( i_pes_header_size > i_ts_payload_size )
        {
            /* These packets are entirely filled by the PES header. */
            i_pes_header_size -= i_ts_payload_size;
            p_ts->i_payload_start = p_ts->i_payload_end;
            /* Go to the next TS packet: here we won't have to test it is
             * not NULL because we trash the PES packets when packet lost
             * occurs */
            p_ts = p_ts->p_next_ts;
            i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
        }
        /* This last packet is partly header, partly payload. */
        p_ts->i_payload_start += i_pes_header_size;
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        /* Now we can eventually put the PES packet in the decoder's
         * PES fifo */
        switch( p_es_descriptor->i_type )
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        {
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            case MPEG1_VIDEO_ES:
            case MPEG2_VIDEO_ES:
                p_fifo = &(((vpar_thread_t*)(p_es_descriptor->p_dec))->fifo);
                break;
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            case MPEG1_AUDIO_ES:
            case MPEG2_AUDIO_ES:
                p_fifo = &(((adec_thread_t*)(p_es_descriptor->p_dec))->fifo);
                break;
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            case AC3_AUDIO_ES:
                p_fifo = &(((ac3dec_thread_t *)(p_es_descriptor->p_dec))->fifo);
                break;
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	    case LPCM_AUDIO_ES:
                p_fifo = &(((lpcmdec_thread_t *)(p_es_descriptor->p_dec))->fifo);
                break;
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            case DVD_SPU_ES:
                /* we skip the first byte at the beginning of the
                 * subpicture payload, it only contains the SPU ID. */
                p_ts->i_payload_start++;
                p_fifo = &(((spudec_thread_t *)(p_es_descriptor->p_dec))->fifo);
                break;
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            default:
                /* This should never happen */
                intf_DbgMsg("Unknown stream type (%d, %d): PES trashed\n",
                    p_es_descriptor->i_id, p_es_descriptor->i_type);
                p_fifo = NULL;
                break;
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        }

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        if( p_fifo != NULL )
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        {
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            vlc_mutex_lock( &p_fifo->data_lock );
            if( DECODER_FIFO_ISFULL( *p_fifo ) )
            {
                /* The FIFO is full !!! This should not happen. */
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#ifdef STATS
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                p_input->c_packets_trashed += p_pes->i_ts_packets;
                p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
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#endif
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                input_NetlistFreePES( p_input, p_pes );
                intf_DbgMsg("PES trashed - fifo full ! (%d, %d)\n",
                           p_es_descriptor->i_id, p_es_descriptor->i_type);
            }
        else
            {
                //intf_DbgMsg("Putting %p into fifo %p/%d\n",
                //            p_pes, p_fifo, p_fifo->i_end);
                p_fifo->buffer[p_fifo->i_end] = p_pes;
                DECODER_FIFO_INCEND( *p_fifo );

                /* Warn the decoder that it's got work to do. */
                vlc_cond_signal( &p_fifo->data_wait );
            }
            vlc_mutex_unlock( &p_fifo->data_lock );
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        }
        else
        {
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            intf_DbgMsg("No fifo to receive PES %p: trash\n", p_pes);
#ifdef STATS
            p_input->c_packets_trashed += p_pes->i_ts_packets;
            p_es_descriptor->c_invalid_packets += p_pes->i_ts_packets;
#endif
            input_NetlistFreePES( p_input, p_pes );
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        }
    }
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#undef p_pes
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}

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/*****************************************************************************
 * input_DemuxPES:
 *****************************************************************************
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 * Gather a PES packet.
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 *****************************************************************************/
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static __inline__ void input_DemuxPES( input_thread_t *p_input,
                                       ts_packet_t *p_ts_packet,
                                       es_descriptor_t *p_es_descriptor,
                                       boolean_t b_unit_start,
                                       boolean_t b_packet_lost )
{
    int                         i_dummy;
    pes_packet_t*               p_last_pes;
    ts_packet_t *               p_ts;
    int                         i_ts_payload_size;
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#define p_pes (p_es_descriptor->p_pes_packet)

    ASSERT(p_input);
    ASSERT(p_ts_packet);
    ASSERT(p_es_descriptor);

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    //intf_DbgMsg("PES-demultiplexing %p (%p)\n", p_ts_packet, p_pes);
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    /* If we lost data, discard the PES packet we are trying to reassemble
       if any and wait for the beginning of a new one in order to synchronise
       again */
    if( b_packet_lost && p_pes != NULL )
    {
        intf_DbgMsg("PES %p trashed because of packet lost\n", p_pes);
        input_NetlistFreePES( p_input, p_pes );
        p_pes = NULL;
    }

    /* If the TS packet contains the begining of a new PES packet, and if we
       were reassembling a PES packet, then the PES should be complete now,
       so parse its header and give it to the decoders */
    if( b_unit_start && p_pes != NULL )
    {
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        /* Parse the header. The header has a variable length, but in order
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           to improve the algorithm, we will read the 14 bytes we may be
           interested in */
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        /* If this part of the header did not fit in the current TS packet,
           copy the part of the header we are interested in to the
           p_pes_header_save buffer. The buffer is dynamicly allocated if
           needed so it's time expensive but this situation almost never
           occurs. */
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        p_ts = p_pes->p_first_ts;
        i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;

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        if(i_ts_payload_size < PES_HEADER_SIZE)
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        {
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            intf_WarnMsg(3, "Code never tested encountered, WARNING ! (benny)\n");
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            if( !p_pes->p_pes_header_save )
            {
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                p_pes->p_pes_header_save = malloc(PES_HEADER_SIZE);
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            }
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            i_dummy = 0;
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            do
            {
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                memcpy( p_pes->p_pes_header_save + i_dummy,
                        &p_ts->buffer[p_ts->i_payload_start],
                        i_ts_payload_size);
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                i_dummy += i_ts_payload_size;
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                p_ts = p_ts->p_next_ts;
                if(!p_ts)
                {
                  /* The payload of the PES packet is shorter than the 14 bytes
                     we would read. This means that high packet lost occured
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                     so the PES won't be useful for any decoder. Moreover,
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                     this should never happen so we can trash the packet and
                     exit roughly without regrets */
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                  intf_DbgMsg("PES packet too short: trashed\n");
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                  input_NetlistFreePES( p_input, p_pes );
                  p_pes = NULL;
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                  /* XXX: Stats */
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                  return;
                }
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                i_ts_payload_size = p_ts->i_payload_end - p_ts->i_payload_start;
            }
            while(i_ts_payload_size + i_dummy < PES_HEADER_SIZE);

            /* This last TS packet is partly header, partly payload, so just
               copy the header part */
            memcpy(p_pes->p_pes_header_save + i_dummy,
                   &p_ts->buffer[p_ts->i_payload_start],
                   PES_HEADER_SIZE - i_dummy);

            /* The header must be read in the buffer not in any TS packet */
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            p_pes->p_pes_header = p_pes->p_pes_header_save;
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            /* Get the PES size if defined */
            if( (i_dummy = U16_AT(p_pes->p_pes_header + 4)) )
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            {
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                p_pes->i_pes_real_size = i_dummy + 6;
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            }
        }

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        /* Now we have the part of the PES header we were interested in:
           p_pes_header and i_pes_real_size ; we can parse it */
        input_ParsePES( p_input, p_es_descriptor );
    }
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    /* If we are at the beginning of a new PES packet, we must fetch a new
       PES buffer to begin with the reassembly of this PES packet. This is
       also here that we can synchronise with the stream if we we lost
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       packets or if the decoder has just started */
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    if( b_unit_start )
    {
        p_last_pes = p_pes;

        /* Get a new one PES from the PES netlist. */
        if( (p_pes = input_NetlistGetPES( p_input )) == (NULL) )
        {
            /* PES netlist is empty ! */
            p_input->b_error = 1;
        }
        else
        {
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            //intf_DbgMsg("New PES packet %p (first TS: %p)\n", p_pes, p_ts_packet);
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            /* Init the PES fields so that the first TS packet could be
             * correctly added to the PES packet (see below) */
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            p_pes->p_first_ts = p_ts_packet;
            p_pes->p_last_ts = NULL;

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            /* If the last pes packet was null, this means that the
             * synchronization was lost and so warn the decoder that he
             * will have to find a way to recover */
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            if( !p_last_pes )
                p_pes->b_data_loss = 1;

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            /* Read the b_random_access flag status and then reinit it */
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            p_pes->b_random_access = p_es_descriptor->b_random;
            p_es_descriptor->b_random = 0;
        }
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        /* If the PES header fits in the first TS packet, we can
         * already set p_pes->p_pes_header, and in all cases we
	 * set p_pes->i_pes_real_size */
        if( p_ts_packet->i_payload_end - p_ts_packet->i_payload_start
                >= PES_HEADER_SIZE )
        {
            p_pes->p_pes_header = &(p_ts_packet->buffer[p_ts_packet->i_payload_start]);
            if( (i_dummy = U16_AT(p_pes->p_pes_header + 4)) )
            {
                p_pes->i_pes_real_size = i_dummy + 6;
            }
        }
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    }


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    /* If we are synchronized with the stream, and so if we are ready to
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       receive correctly the data, add the TS packet to the current PES
       packet */
    if( p_pes != NULL )
    {
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        //intf_DbgMsg("Adding TS %p to PES %p\n", p_ts_packet, p_pes);
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        /* Size of the payload carried in the TS packet */
        i_ts_payload_size = p_ts_packet->i_payload_end -
                            p_ts_packet->i_payload_start;

        /* Update the relations between the TS packets */
        p_ts_packet->p_prev_ts = p_pes->p_last_ts;
        p_ts_packet->p_next_ts = NULL;
        if( p_pes->i_ts_packets != 0 )
        {
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            /* Regarder si il serait pas plus efficace de ne creer que
             * les liens precedent->suivant pour le moment, et les
             * liens suivant->precedent quand le paquet est termine */
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            /* Otherwise it is the first TS packet. */
            p_pes->p_last_ts->p_next_ts = p_ts_packet;
        }
        /* Now add the TS to the PES packet */
        p_pes->p_last_ts = p_ts_packet;
        p_pes->i_ts_packets++;
        p_pes->i_pes_size += i_ts_payload_size;

        /* Stats */
#ifdef STATS
        i_dummy = p_ts_packet->i_payload_end - p_ts_packet->i_payload_start;
        p_es_descriptor->c_payload_bytes += i_dummy;
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        p_input->c_payload_bytes += i_dummy;
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#endif
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        /* We can check if the packet is finished */
        if( p_pes->i_pes_size == p_pes->i_pes_real_size )
        {
            /* The packet is finished, parse it */
            input_ParsePES( p_input, p_es_descriptor );

            /* Tell the Demux we have parsed this PES, no need to redo it */
            p_pes = NULL;
        }
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    }
    else
    {
        /* Since we don't use the TS packet to build a PES packet, we don't
           need it anymore, so give it back to the netlist */
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        //intf_DbgMsg("Trashing TS %p: no PES being build\n", p_ts_packet);
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        input_NetlistFreeTS( p_input, p_ts_packet );
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    }
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#undef p_pes
}

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/*****************************************************************************
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 * input_DemuxTS: first step of demultiplexing: the TS header
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 *****************************************************************************
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 * Stream must also only contain PES and PSI, so PID must have been filtered
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 *****************************************************************************/
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static __inline__ void input_DemuxTS( input_thread_t *p_input,
                                      ts_packet_t *p_ts_packet,
                                      es_descriptor_t *p_es_descriptor )
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{
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    int         i_dummy;
    boolean_t   b_adaption;                     /* Adaption field is present */
    boolean_t   b_payload;                         /* Packet carries payload */
    boolean_t   b_unit_start;          /* A PSI or a PES start in the packet */
    boolean_t   b_trash = 0;                 /* Must the packet be trashed ? */
    boolean_t   b_lost = 0;                     /* Was there a packet lost ? */

    ASSERT(p_input);
    ASSERT(p_ts_packet);
    ASSERT(p_es_descriptor);
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#define p (p_ts_packet->buffer)
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    //intf_DbgMsg("input debug: TS-demultiplexing packet %p, pid %d, number %d\n",
    //            p_ts_packet, U16_AT(&p[1]) & 0x1fff, p[3] & 0x0f);
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#ifdef STATS
    p_es_descriptor->c_packets++;
    p_es_descriptor->c_bytes += TS_PACKET_SIZE;
#endif
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    /* Extract flags values from TS common header. */
    b_unit_start = (p[1] & 0x40);
    b_adaption = (p[3] & 0x20);
    b_payload = (p[3] & 0x10);

    /* Extract adaption field informations if any */
    if( !b_adaption )
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    {
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        /* We don't have any adaptation_field, so payload start immediately
           after the 4 byte TS header */
        p_ts_packet->i_payload_start = 4;
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    }
    else
    {
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        /* p[4] is adaptation_field_length minus one */
        p_ts_packet->i_payload_start = 5 + p[4];
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        /* The adaption field can be limited to the adaptation_field_length byte,
           so that there is nothing to do: skip this possibility */
        if( p[4] )
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        {
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            /* If the packet has both adaptation_field and payload, adaptation_field
               cannot be more than 182 bytes long; if there is only an
               adaptation_field, it must fill the next 183 bytes. */
            if( b_payload ? (p[4] > 182) : (p[4] != 183) )
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            {
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                intf_DbgMsg("input debug: invalid TS adaptation field (%p)\n",
                            p_ts_packet);
#ifdef STATS
                p_es_descriptor->c_invalid_packets++;
#endif
                b_trash = 1;
            }
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            /* No we are sure that the byte containing flags is present: read it */
            else
            {
                /* discontinuity_indicator */
                if( p[5] & 0x80 )
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                {
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                    intf_DbgMsg("discontinuity_indicator encountered by TS demux " \
                                "(position read: %d, saved: %d)\n", p[5] & 0x80,
                                p_es_descriptor->i_continuity_counter);
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                    /* If the PID carries the PCR, there will be a system time-base
                       discontinuity. We let the PCR decoder handle that. */
                    p_es_descriptor->b_discontinuity = 1;
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                    /* There also may be a continuity_counter discontinuity:
               resynchronise our counter with the one of the stream */
                    p_es_descriptor->i_continuity_counter = (p[3] & 0x0f) - 1;
                }
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                /* random_access_indicator */
                p_es_descriptor->b_random |= p[5] & 0x40;
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                /* If this is a PCR_PID, and this TS packet contains a PCR,
           we pass it along to the PCR decoder. */
                if( (p_es_descriptor->b_pcr) && (p[5] & 0x10) )
                {
                    /* There should be a PCR field in the packet, check if the
               adaption field is long enough to carry it */
                    if( p[4] >= 7 )
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                    {
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                        /* Call the PCR decoder */
                        input_PcrDecode( p_input, p_es_descriptor, &p[6] );
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                    }
                }
            }
        }
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    }

    /* Check the continuity of the stream. */
    i_dummy = ((p[3] & 0x0f) - p_es_descriptor->i_continuity_counter) & 0x0f;
    if( i_dummy == 1 )
    {
        /* Everything is ok, just increase our counter */
        p_es_descriptor->i_continuity_counter++;
    }
    else
    {
        if( !b_payload && i_dummy == 0 )
        {
            /* This is a packet without payload, this is allowed by the draft
               As there is nothing interesting in this packet (except PCR that
               have already been handled), we can trash the packet. */
            intf_DbgMsg("Packet without payload received by TS demux\n");
            b_trash = 1;
        }
        else if( i_dummy <= 0 )
        {
            /* Duplicate packet: mark it as being to be trashed. */
            intf_DbgMsg("Duplicate packet received by TS demux\n");
            b_trash = 1;
        }
        else if( p_es_descriptor->i_continuity_counter == 0xFF )
        {
            /* This means that the packet is the first one we receive for this
               ES since the continuity counter ranges between 0 and 0x0F
               excepts when it has been initialized by the input: Init the
               counter to the correct value. */
            intf_DbgMsg("First packet for PID %d received by TS demux\n",
                        p_es_descriptor->i_id);
            p_es_descriptor->i_continuity_counter = (p[3] & 0x0f);
        }
        else
        {
            /* This can indicate that we missed a packet or that the
               continuity_counter wrapped and we received a dup packet: as we
               don't know, do as if we missed a packet to be sure to recover
               from this situation */
            intf_DbgMsg("Packet lost by TS demux: current %d, packet %d\n",
                        p_es_descriptor->i_continuity_counter & 0x0f,
                        p[3] & 0x0f);
            b_lost = 1;
            p_es_descriptor->i_continuity_counter = p[3] & 0x0f;
        }
    }
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    /* Trash the packet if it has no payload or if it is bad */
    if( b_trash )
    {
        input_NetlistFreeTS( p_input, p_ts_packet );
#ifdef STATS
        p_input->c_packets_trashed++;
#endif
    }
    else
    {
        if( p_es_descriptor->b_psi )
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        {
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            /* The payload contains PSI tables */
            input_DemuxPSI( p_input, p_ts_packet, p_es_descriptor,
                            b_unit_start, b_lost );
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        }
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        else
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        {
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            /* The payload carries a PES stream */
            input_DemuxPES( p_input, p_ts_packet, p_es_descriptor,
                            b_unit_start, b_lost );
        }
    }
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#undef p
}
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/*****************************************************************************
 * input_SortPacket: find out whether we need that packet
 *****************************************************************************/
static __inline__ void input_SortPacket( input_thread_t *p_input,
                                         ts_packet_t *p_ts_packet )
{
    int             i_current_pid;
    int             i_es_loop;
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    /* Verify that sync_byte, error_indicator and scrambling_control are
       what we expected. */
    if( !(p_ts_packet->buffer[0] == 0x47) || (p_ts_packet->buffer[1] & 0x80) ||
        (p_ts_packet->buffer[3] & 0xc0) )
    {
        intf_DbgMsg("input debug: invalid TS header (%p)\n", p_ts_packet);
    }
    else
    {
        /* Get the PID of the packet. Note that ntohs is needed, for endianness
           purposes (see man page). */
        i_current_pid = U16_AT(&p_ts_packet->buffer[1]) & 0x1fff;
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        //intf_DbgMsg("input debug: pid %d received (%p)\n",
        //            i_current_pid, p_ts_packet);
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        /* Lock current ES state. */
        vlc_mutex_lock( &p_input->es_lock );
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    /* Verify that we actually want this PID. */
        for( i_es_loop = 0; i_es_loop < INPUT_MAX_SELECTED_ES; i_es_loop++ )
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        {
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            if( p_input->pp_selected_es[i_es_loop] != NULL)
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            {
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                if( (*p_input->pp_selected_es[i_es_loop]).i_id
                     == i_current_pid )
                {
                    /* Don't need the lock anymore, since the value pointed
                       out by p_input->pp_selected_es[i_es_loop] can only be
                       modified from inside the input_thread (by the PSI
                       decoder): interface thread is only allowed to modify
                       the pp_selected_es table */
                    vlc_mutex_unlock( &p_input->es_lock );

                    /* We're interested. Pass it to the demultiplexer. */
                    input_DemuxTS( p_input, p_ts_packet,
                                   p_input->pp_selected_es[i_es_loop] );
                    return;
                }
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            }
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            else
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            {
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                /* pp_selected_es should not contain any hole. */
                break;
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            }
        }
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        vlc_mutex_unlock( &p_input->es_lock );
    }

    /* We weren't interested in receiving this packet. Give it back to the
       netlist. */
    //intf_DbgMsg("SortPacket: freeing unwanted TS %p (pid %d)\n", p_ts_packet,
    //                 U16_AT(&p_ts_packet->buffer[1]) & 0x1fff);
    input_NetlistFreeTS( p_input, p_ts_packet );
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#ifdef STATS
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    p_input->c_packets_trashed++;
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#endif
}

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/*****************************************************************************
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 * input_ReadPacket: reads a packet from the network or the file
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 *****************************************************************************/
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static __inline__ int input_ReadPacket( input_thread_t *p_input )
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{
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    int                 i_base_index; /* index of the first free iovec */
    int                 i_current_index;
    int                 i_packet_size;
#ifdef INPUT_LIFO_TS_NETLIST
    int                 i_meanwhile_released;
    int                 i_currently_removed;
#endif
    ts_packet_t *       p_ts_packet;
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