git.sesse.net Git - vlc/blob - plugins/mpeg_system/input_es.c

   1 /*****************************************************************************
   2  * input_es.c: Elementary Stream demux and packet management
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  * $Id: input_es.c,v 1.2 2001/12/10 04:53:11 sam Exp $
   6  *
   7  * Author: Christophe Massiot <massiot@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 #define MODULE_NAME mpeg_es
  25 #include "modules_inner.h"
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30 #include "defs.h"
  31
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <errno.h>
  35
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38
  39 #ifdef HAVE_UNISTD_H
  40 #   include <unistd.h>
  41 #endif
  42
  43 #include <fcntl.h>
  44
  45 #if defined( WIN32 )
  46 #   include <io.h>                                                 /* read() */
  47 #else
  48 #   include <sys/uio.h>                                      /* struct iovec */
  49 #endif
  50
  51 #include "common.h"
  52 #include "intf_msg.h"
  53 #include "threads.h"
  54 #include "mtime.h"
  55 #include "tests.h"
  56
  57 #if defined( WIN32 )
  58 #   include "input_iovec.h"
  59 #endif
  60
  61 #include "stream_control.h"
  62 #include "input_ext-intf.h"
  63 #include "input_ext-dec.h"
  64 #include "input_ext-plugins.h"
  65
  66 #include "input_es.h"
  67
  68 #include "debug.h"
  69
  70 #include "modules.h"
  71 #include "modules_export.h"
  72
  73 /*****************************************************************************
  74  * Local prototypes
  75  *****************************************************************************/
  76 static int  ESProbe     ( probedata_t * );
  77 static int  ESRead      ( struct input_thread_s *,
  78                           data_packet_t * p_packets[INPUT_READ_ONCE] );
  79 static void ESInit          ( struct input_thread_s * );
  80 static void ESEnd           ( struct input_thread_s * );
  81 static void ESSeek          ( struct input_thread_s *, off_t );
  82 static int  ESSetProgram    ( struct input_thread_s *, pgrm_descriptor_t * );
  83 static void ESDemux         ( struct input_thread_s *,
  84                                 struct data_packet_s * );
  85 static void ESNextDataPacket( struct bit_stream_s * );
  86 static void ESInitBitstream( struct bit_stream_s *, struct decoder_fifo_s *,
  87                         void (* pf_bitstream_callback)( struct bit_stream_s *,
  88                                                         boolean_t ),
  89                         void * );
  90
  91
  92 /*****************************************************************************
  93  * Functions exported as capabilities. They are declared as static so that
  94  * we don't pollute the namespace too much.
  95  *****************************************************************************/
  96 void _M( input_getfunctions )( function_list_t * p_function_list )
  97 {
  98 #define input p_function_list->functions.input
  99     p_function_list->pf_probe = ESProbe;
 100     input.pf_init             = ESInit;
 101     input.pf_open             = NULL;
 102     input.pf_close            = NULL;
 103     input.pf_end              = ESEnd;
 104     input.pf_init_bit_stream  = ESInitBitstream;
 105     input.pf_set_area         = NULL;
 106     input.pf_set_program      = ESSetProgram;
 107     input.pf_read             = ESRead;
 108     input.pf_demux            = ESDemux;
 109     input.pf_new_packet       = input_NetlistNewPacket;
 110     input.pf_new_pes          = input_NetlistNewPES;
 111     input.pf_delete_packet    = input_NetlistDeletePacket;
 112     input.pf_delete_pes       = input_NetlistDeletePES;
 113     input.pf_rewind           = NULL;
 114     input.pf_seek             = ESSeek;
 115 #undef input
 116 }
 117
 118 /*
 119  * Data reading functions
 120  */
 121
 122 /*****************************************************************************
 123  * ESProbe: verifies that the stream is a ES stream
 124  *****************************************************************************/
 125 static int ESProbe( probedata_t *p_data )
 126 {
 127     int i_score = 5;
 128
 129     if( TestMethod( INPUT_METHOD_VAR, "es" ) )
 130     {
 131         return( 999 );
 132     }
 133
 134     return( i_score );
 135 }
 136
 137 /*****************************************************************************
 138  * ESInit: initializes ES structures
 139  *****************************************************************************/
 140 static void ESInit( input_thread_t * p_input )
 141 {
 142     es_descriptor_t *   p_es;
 143
 144     p_input->p_method_data = NULL;
 145
 146     /* Initialize netlist */
 147     if( input_NetlistInit( p_input, NB_DATA, NB_DATA, NB_PES, ES_PACKET_SIZE,
 148                            INPUT_READ_ONCE ) )
 149     {
 150         intf_ErrMsg( "ES input : Could not initialize netlist" );
 151         return;
 152     }
 153
 154     /* FIXME : detect if InitStream failed */
 155     input_InitStream( p_input, 0 );
 156     input_AddProgram( p_input, 0, 0 );
 157     vlc_mutex_lock( &p_input->stream.stream_lock );
 158     p_es = input_AddES( p_input, p_input->stream.pp_programs[0], 0xE0, 0 );
 159     p_es->i_stream_id = 0xE0;
 160     p_es->i_type = MPEG1_VIDEO_ES;
 161     p_es->i_cat = VIDEO_ES;
 162     input_SelectES( p_input, p_es );
 163     p_input->stream.p_selected_area->i_tell = 0;
 164     p_input->stream.pp_programs[0]->b_is_ok = 1;
 165     vlc_mutex_unlock( &p_input->stream.stream_lock );
 166 }
 167
 168 /*****************************************************************************
 169  * ESEnd: frees unused data
 170  *****************************************************************************/
 171 static void ESEnd( input_thread_t * p_input )
 172 {
 173 }
 174
 175 /*****************************************************************************
 176  * ESRead: reads data packets
 177  *****************************************************************************
 178  * Returns -1 in case of error, 0 if everything went well, and 1 in case of
 179  * EOF.
 180  *****************************************************************************/
 181 static int ESRead( input_thread_t * p_input,
 182                    data_packet_t * pp_packets[INPUT_READ_ONCE] )
 183 {
 184     int             i_read;
 185     struct iovec  * p_iovec;
 186
 187     /* Get iovecs */
 188     p_iovec = input_NetlistGetiovec( p_input->p_method_data );
 189
 190     if ( p_iovec == NULL )
 191     {
 192         return( -1 ); /* empty netlist */
 193     }
 194
 195     memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
 196
 197     i_read = readv( p_input->i_handle, p_iovec, INPUT_READ_ONCE );
 198     if( i_read == -1 )
 199     {
 200         intf_ErrMsg( "input error: ES readv error" );
 201         return( -1 );
 202     }
 203
 204     input_NetlistMviovec( p_input->p_method_data,
 205              (int)(i_read/ES_PACKET_SIZE), pp_packets );
 206
 207     p_input->stream.p_selected_area->i_tell += i_read;
 208
 209     return( 0 );
 210 }
 211
 212 /*****************************************************************************
 213  * ESSeek: changes the stream position indicator
 214  *****************************************************************************/
 215 static void ESSeek( input_thread_t * p_input, off_t i_position )
 216 {
 217     lseek( p_input->i_handle, i_position, SEEK_SET );
 218
 219     p_input->stream.p_selected_area->i_tell = i_position;
 220 }
 221
 222
 223 /*****************************************************************************
 224  * ESSetProgram: Does nothing
 225  *****************************************************************************/
 226 static int ESSetProgram( input_thread_t * p_input, pgrm_descriptor_t * p_pgrm )
 227 {
 228     return( 0 );
 229 }
 230
 231 /*****************************************************************************
 232  * ESDemux: fakes a demultiplexer
 233  *****************************************************************************/
 234 static void ESDemux( input_thread_t * p_input, data_packet_t * p_data )
 235 {
 236     pes_packet_t *  p_pes = p_input->pf_new_pes( p_input->p_method_data );
 237     decoder_fifo_t * p_fifo =
 238         p_input->stream.pp_programs[0]->pp_es[0]->p_decoder_fifo;
 239
 240     if( p_pes == NULL )
 241     {
 242         intf_ErrMsg("Out of memory");
 243         p_input->b_error = 1;
 244         return;
 245     }
 246
 247     p_pes->i_rate = p_input->stream.control.i_rate;
 248     p_pes->p_first = p_data;
 249
 250     if( (p_input->stream.pp_programs[0]->i_synchro_state == SYNCHRO_REINIT)
 251          | (input_ClockManageControl( p_input, p_input->stream.pp_programs[0],
 252                                   (mtime_t)0 ) == PAUSE_S) )
 253     {
 254         intf_WarnMsg( 2, "synchro reinit" );
 255         p_pes->i_pts = mdate() + DEFAULT_PTS_DELAY;
 256         p_input->stream.pp_programs[0]->i_synchro_state = SYNCHRO_OK;
 257     }
 258
 259     input_DecodePES( p_fifo, p_pes );
 260
 261     vlc_mutex_lock( &p_fifo->data_lock );
 262     if( ( (DECODER_FIFO_END( *p_fifo ) - DECODER_FIFO_START( *p_fifo ))
 263             & FIFO_SIZE ) >= MAX_PACKETS_IN_FIFO )
 264     {
 265         vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
 266     }
 267     vlc_mutex_unlock( &p_fifo->data_lock );
 268 }
 269
 270 /*****************************************************************************
 271  * ESNextDataPacket: signals the input thread if there isn't enough packets
 272  * available
 273  *****************************************************************************/
 274 static void ESNextDataPacket( bit_stream_t * p_bit_stream )
 275 {
 276     decoder_fifo_t *    p_fifo = p_bit_stream->p_decoder_fifo;
 277     boolean_t           b_new_pes;
 278
 279     /* We are looking for the next data packet that contains real data,
 280      * and not just a PES header */
 281     do
 282     {
 283         /* We were reading the last data packet of this PES packet... It's
 284          * time to jump to the next PES packet */
 285         if( p_bit_stream->p_data->p_next == NULL )
 286         {
 287             /* We are going to read/write the start and end indexes of the
 288              * decoder fifo and to use the fifo's conditional variable,
 289              * that's why we need to take the lock before. */
 290             vlc_mutex_lock( &p_fifo->data_lock );
 291
 292             /* Free the previous PES packet. */
 293             p_fifo->pf_delete_pes( p_fifo->p_packets_mgt,
 294                                    DECODER_FIFO_START( *p_fifo ) );
 295             DECODER_FIFO_INCSTART( *p_fifo );
 296
 297             if( DECODER_FIFO_ISEMPTY( *p_fifo ) )
 298             {
 299                 /* Signal the input thread we're waiting. */
 300                 vlc_cond_signal( &p_fifo->data_wait );
 301
 302                 /* Wait for the input to tell us when we receive a packet. */
 303                 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
 304             }
 305
 306             /* The next byte could be found in the next PES packet */
 307             p_bit_stream->p_data = DECODER_FIFO_START( *p_fifo )->p_first;
 308
 309             vlc_mutex_unlock( &p_fifo->data_lock );
 310
 311             b_new_pes = 1;
 312         }
 313         else
 314         {
 315             /* Perhaps the next data packet of the current PES packet contains
 316              * real data (ie its payload's size is greater than 0). */
 317             p_bit_stream->p_data = p_bit_stream->p_data->p_next;
 318
 319             b_new_pes = 0;
 320         }
 321     } while ( p_bit_stream->p_data->p_payload_start
 322                == p_bit_stream->p_data->p_payload_end );
 323
 324     /* We've found a data packet which contains interesting data... */
 325     p_bit_stream->p_byte = p_bit_stream->p_data->p_payload_start;
 326     p_bit_stream->p_end  = p_bit_stream->p_data->p_payload_end;
 327
 328     /* Call back the decoder. */
 329     if( p_bit_stream->pf_bitstream_callback != NULL )
 330     {
 331         p_bit_stream->pf_bitstream_callback( p_bit_stream, b_new_pes );
 332     }
 333 }
 334
 335 /*****************************************************************************
 336  * ESInitBitstream: changes pf_next_data_packet
 337  *****************************************************************************/
 338 static void ESInitBitstream( bit_stream_t * p_bit_stream,
 339                              decoder_fifo_t * p_decoder_fifo,
 340                         void (* pf_bitstream_callback)( struct bit_stream_s *,
 341                                                         boolean_t ),
 342                             void * p_callback_arg )
 343 {
 344     InitBitstream( p_bit_stream, p_decoder_fifo, pf_bitstream_callback,
 345                    p_callback_arg );
 346     p_bit_stream->pf_next_data_packet = ESNextDataPacket;
 347 }