git.sesse.net Git - vlc/blob - plugins/mpeg/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 1.15 2001/12/07 16:47:47 jobi 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 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 "config.h"
  52 #include "common.h"
  53 #include "intf_msg.h"
  54 #include "threads.h"
  55 #include "mtime.h"
  56 #include "tests.h"
  57
  58 #if defined( WIN32 )
  59 #   include "input_iovec.h"
  60 #endif
  61
  62 #include "main.h"
  63
  64 #include "modules.h"
  65 #include "modules_export.h"
  66
  67 #include "stream_control.h"
  68 #include "input_ext-intf.h"
  69 #include "input_ext-dec.h"
  70 #include "input_ext-plugins.h"
  71
  72 #include "input_es.h"
  73
  74 #include "debug.h"
  75
  76 /*****************************************************************************
  77  * Local prototypes
  78  *****************************************************************************/
  79 static int  ESProbe     ( probedata_t * );
  80 static int  ESRead      ( struct input_thread_s *,
  81                           data_packet_t * p_packets[INPUT_READ_ONCE] );
  82 static void ESInit          ( struct input_thread_s * );
  83 static void ESEnd           ( struct input_thread_s * );
  84 static void ESSeek          ( struct input_thread_s *, off_t );
  85 static int  ESSetProgram    ( struct input_thread_s *, pgrm_descriptor_t * );
  86 static void ESDemux         ( struct input_thread_s *,
  87                                 struct data_packet_s * );
  88 static void ESNextDataPacket( struct bit_stream_s * );
  89 static void ESInitBitstream( struct bit_stream_s *, struct decoder_fifo_s *,
  90                         void (* pf_bitstream_callback)( struct bit_stream_s *,
  91                                                         boolean_t ),
  92                         void * );
  93
  94
  95 /*****************************************************************************
  96  * Functions exported as capabilities. They are declared as static so that
  97  * we don't pollute the namespace too much.
  98  *****************************************************************************/
  99 void _M( input_getfunctions )( function_list_t * p_function_list )
 100 {
 101 #define input p_function_list->functions.input
 102     p_function_list->pf_probe = ESProbe;
 103     input.pf_init             = ESInit;
 104     input.pf_open             = NULL;
 105     input.pf_close            = NULL;
 106     input.pf_end              = ESEnd;
 107     input.pf_init_bit_stream  = ESInitBitstream;
 108     input.pf_set_area         = NULL;
 109     input.pf_set_program      = ESSetProgram;
 110     input.pf_read             = ESRead;
 111     input.pf_demux            = ESDemux;
 112     input.pf_new_packet       = input_NetlistNewPacket;
 113     input.pf_new_pes          = input_NetlistNewPES;
 114     input.pf_delete_packet    = input_NetlistDeletePacket;
 115     input.pf_delete_pes       = input_NetlistDeletePES;
 116     input.pf_rewind           = NULL;
 117     input.pf_seek             = ESSeek;
 118 #undef input
 119 }
 120
 121 /*
 122  * Data reading functions
 123  */
 124
 125 /*****************************************************************************
 126  * ESProbe: verifies that the stream is a ES stream
 127  *****************************************************************************/
 128 static int ESProbe( probedata_t *p_data )
 129 {
 130     int i_score = 5;
 131
 132     if( TestMethod( INPUT_METHOD_VAR, "es" ) )
 133     {
 134         return( 999 );
 135     }
 136
 137     return( i_score );
 138 }
 139
 140 /*****************************************************************************
 141  * ESInit: initializes ES structures
 142  *****************************************************************************/
 143 static void ESInit( input_thread_t * p_input )
 144 {
 145     es_descriptor_t *   p_es;
 146
 147     p_input->p_method_data = NULL;
 148
 149     /* Initialize netlist */
 150     if( input_NetlistInit( p_input, NB_DATA, NB_DATA, NB_PES, ES_PACKET_SIZE,
 151                            INPUT_READ_ONCE ) )
 152     {
 153         intf_ErrMsg( "ES input : Could not initialize netlist" );
 154         return;
 155     }
 156
 157     /* FIXME : detect if InitStream failed */
 158     input_InitStream( p_input, 0 );
 159     input_AddProgram( p_input, 0, 0 );
 160     vlc_mutex_lock( &p_input->stream.stream_lock );
 161     p_es = input_AddES( p_input, p_input->stream.pp_programs[0], 0xE0, 0 );
 162     p_es->i_stream_id = 0xE0;
 163     p_es->i_type = MPEG1_VIDEO_ES;
 164     p_es->i_cat = VIDEO_ES;
 165     input_SelectES( p_input, p_es );
 166     p_input->stream.p_selected_area->i_tell = 0;
 167     p_input->stream.pp_programs[0]->b_is_ok = 1;
 168     vlc_mutex_unlock( &p_input->stream.stream_lock );
 169 }
 170
 171 /*****************************************************************************
 172  * ESEnd: frees unused data
 173  *****************************************************************************/
 174 static void ESEnd( input_thread_t * p_input )
 175 {
 176 }
 177
 178 /*****************************************************************************
 179  * ESRead: reads data packets
 180  *****************************************************************************
 181  * Returns -1 in case of error, 0 if everything went well, and 1 in case of
 182  * EOF.
 183  *****************************************************************************/
 184 static int ESRead( input_thread_t * p_input,
 185                    data_packet_t * pp_packets[INPUT_READ_ONCE] )
 186 {
 187     int             i_read;
 188     struct iovec  * p_iovec;
 189
 190     /* Get iovecs */
 191     p_iovec = input_NetlistGetiovec( p_input->p_method_data );
 192
 193     if ( p_iovec == NULL )
 194     {
 195         return( -1 ); /* empty netlist */
 196     }
 197
 198     memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
 199
 200     i_read = readv( p_input->i_handle, p_iovec, INPUT_READ_ONCE );
 201     if( i_read == -1 )
 202     {
 203         intf_ErrMsg( "input error: ES readv error" );
 204         return( -1 );
 205     }
 206
 207     input_NetlistMviovec( p_input->p_method_data,
 208              (int)(i_read/ES_PACKET_SIZE), pp_packets );
 209
 210     p_input->stream.p_selected_area->i_tell += i_read;
 211
 212     return( 0 );
 213 }
 214
 215 /*****************************************************************************
 216  * ESSeek: changes the stream position indicator
 217  *****************************************************************************/
 218 static void ESSeek( input_thread_t * p_input, off_t i_position )
 219 {
 220     lseek( p_input->i_handle, i_position, SEEK_SET );
 221
 222     p_input->stream.p_selected_area->i_tell = i_position;
 223 }
 224
 225
 226 /*****************************************************************************
 227  * ESSetProgram: Does nothing
 228  *****************************************************************************/
 229 static int ESSetProgram( input_thread_t * p_input, pgrm_descriptor_t * p_pgrm )
 230 {
 231     return( 0 );
 232 }
 233
 234 /*****************************************************************************
 235  * ESDemux: fakes a demultiplexer
 236  *****************************************************************************/
 237 static void ESDemux( input_thread_t * p_input, data_packet_t * p_data )
 238 {
 239     pes_packet_t *  p_pes = p_input->pf_new_pes( p_input->p_method_data );
 240     decoder_fifo_t * p_fifo =
 241         p_input->stream.pp_programs[0]->pp_es[0]->p_decoder_fifo;
 242
 243     if( p_pes == NULL )
 244     {
 245         intf_ErrMsg("Out of memory");
 246         p_input->b_error = 1;
 247         return;
 248     }
 249
 250     p_pes->i_rate = p_input->stream.control.i_rate;
 251     p_pes->p_first = p_data;
 252
 253     if( (p_input->stream.pp_programs[0]->i_synchro_state == SYNCHRO_REINIT)
 254          | (input_ClockManageControl( p_input, p_input->stream.pp_programs[0],
 255                                   (mtime_t)0 ) == PAUSE_S) )
 256     {
 257         intf_WarnMsg( 2, "synchro reinit" );
 258         p_pes->i_pts = mdate() + DEFAULT_PTS_DELAY;
 259         p_input->stream.pp_programs[0]->i_synchro_state = SYNCHRO_OK;
 260     }
 261
 262     input_DecodePES( p_fifo, p_pes );
 263
 264     vlc_mutex_lock( &p_fifo->data_lock );
 265     if( ( (DECODER_FIFO_END( *p_fifo ) - DECODER_FIFO_START( *p_fifo ))
 266             & FIFO_SIZE ) >= MAX_PACKETS_IN_FIFO )
 267     {
 268         vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
 269     }
 270     vlc_mutex_unlock( &p_fifo->data_lock );
 271 }
 272
 273 /*****************************************************************************
 274  * ESNextDataPacket: signals the input thread if there isn't enough packets
 275  * available
 276  *****************************************************************************/
 277 static void ESNextDataPacket( bit_stream_t * p_bit_stream )
 278 {
 279     decoder_fifo_t *    p_fifo = p_bit_stream->p_decoder_fifo;
 280     boolean_t           b_new_pes;
 281
 282     /* We are looking for the next data packet that contains real data,
 283      * and not just a PES header */
 284     do
 285     {
 286         /* We were reading the last data packet of this PES packet... It's
 287          * time to jump to the next PES packet */
 288         if( p_bit_stream->p_data->p_next == NULL )
 289         {
 290             /* We are going to read/write the start and end indexes of the
 291              * decoder fifo and to use the fifo's conditional variable,
 292              * that's why we need to take the lock before. */
 293             vlc_mutex_lock( &p_fifo->data_lock );
 294
 295             /* Free the previous PES packet. */
 296             p_fifo->pf_delete_pes( p_fifo->p_packets_mgt,
 297                                    DECODER_FIFO_START( *p_fifo ) );
 298             DECODER_FIFO_INCSTART( *p_fifo );
 299
 300             if( DECODER_FIFO_ISEMPTY( *p_fifo ) )
 301             {
 302                 /* Signal the input thread we're waiting. */
 303                 vlc_cond_signal( &p_fifo->data_wait );
 304
 305                 /* Wait for the input to tell us when we receive a packet. */
 306                 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
 307             }
 308
 309             /* The next byte could be found in the next PES packet */
 310             p_bit_stream->p_data = DECODER_FIFO_START( *p_fifo )->p_first;
 311
 312             vlc_mutex_unlock( &p_fifo->data_lock );
 313
 314             b_new_pes = 1;
 315         }
 316         else
 317         {
 318             /* Perhaps the next data packet of the current PES packet contains
 319              * real data (ie its payload's size is greater than 0). */
 320             p_bit_stream->p_data = p_bit_stream->p_data->p_next;
 321
 322             b_new_pes = 0;
 323         }
 324     } while ( p_bit_stream->p_data->p_payload_start
 325                == p_bit_stream->p_data->p_payload_end );
 326
 327     /* We've found a data packet which contains interesting data... */
 328     p_bit_stream->p_byte = p_bit_stream->p_data->p_payload_start;
 329     p_bit_stream->p_end  = p_bit_stream->p_data->p_payload_end;
 330
 331     /* Call back the decoder. */
 332     if( p_bit_stream->pf_bitstream_callback != NULL )
 333     {
 334         p_bit_stream->pf_bitstream_callback( p_bit_stream, b_new_pes );
 335     }
 336 }
 337
 338 /*****************************************************************************
 339  * ESInitBitstream: changes pf_next_data_packet
 340  *****************************************************************************/
 341 static void ESInitBitstream( bit_stream_t * p_bit_stream,
 342                              decoder_fifo_t * p_decoder_fifo,
 343                         void (* pf_bitstream_callback)( struct bit_stream_s *,
 344                                                         boolean_t ),
 345                             void * p_callback_arg )
 346 {
 347     InitBitstream( p_bit_stream, p_decoder_fifo, pf_bitstream_callback,
 348                    p_callback_arg );
 349     p_bit_stream->pf_next_data_packet = ESNextDataPacket;
 350 }