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 1.12 2001/11/11 01:32:03 stef 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 "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 "intf_msg.h"
  62
  63 #include "main.h"
  64
  65 #include "stream_control.h"
  66 #include "input_ext-intf.h"
  67 #include "input_ext-dec.h"
  68 #include "input_ext-plugins.h"
  69
  70 #include "input_es.h"
  71
  72 #include "debug.h"
  73
  74 #include "modules.h"
  75 #include "modules_export.h"
  76
  77 /*****************************************************************************
  78  * Local prototypes
  79  *****************************************************************************/
  80 static int  ESProbe     ( probedata_t * );
  81 static int  ESRead      ( struct input_thread_s *,
  82                           data_packet_t * p_packets[INPUT_READ_ONCE] );
  83 static void ESInit      ( struct input_thread_s * );
  84 static void ESEnd       ( struct input_thread_s * );
  85 static void ESSeek      ( struct input_thread_s *, off_t );
  86 static void ESDemux     ( struct input_thread_s *, struct data_packet_s * );
  87 static void ESNextDataPacket( struct bit_stream_s * );
  88 static void ESInitBitstream( struct bit_stream_s *, struct decoder_fifo_s *,
  89                         void (* pf_bitstream_callback)( struct bit_stream_s *,
  90                                                         boolean_t ),
  91                         void * );
  92
  93
  94 /*****************************************************************************
  95  * Functions exported as capabilities. They are declared as static so that
  96  * we don't pollute the namespace too much.
  97  *****************************************************************************/
  98 void _M( input_getfunctions )( function_list_t * p_function_list )
  99 {
 100 #define input p_function_list->functions.input
 101     p_function_list->pf_probe = ESProbe;
 102     input.pf_init             = ESInit;
 103     input.pf_open             = NULL;
 104     input.pf_close            = NULL;
 105     input.pf_end              = ESEnd;
 106     input.pf_init_bit_stream  = ESInitBitstream;
 107     input.pf_set_area         = NULL;
 108     input.pf_read             = ESRead;
 109     input.pf_demux            = ESDemux;
 110     input.pf_new_packet       = input_NetlistNewPacket;
 111     input.pf_new_pes          = input_NetlistNewPES;
 112     input.pf_delete_packet    = input_NetlistDeletePacket;
 113     input.pf_delete_pes       = input_NetlistDeletePES;
 114     input.pf_rewind           = NULL;
 115     input.pf_seek             = ESSeek;
 116 #undef input
 117 }
 118
 119 /*
 120  * Data reading functions
 121  */
 122
 123 /*****************************************************************************
 124  * ESProbe: verifies that the stream is a ES stream
 125  *****************************************************************************/
 126 static int ESProbe( probedata_t *p_data )
 127 {
 128     int i_score = 5;
 129
 130     if( TestMethod( INPUT_METHOD_VAR, "es" ) )
 131     {
 132         return( 999 );
 133     }
 134
 135     return( i_score );
 136 }
 137
 138 /*****************************************************************************
 139  * ESInit: initializes ES structures
 140  *****************************************************************************/
 141 static void ESInit( input_thread_t * p_input )
 142 {
 143     es_descriptor_t *   p_es;
 144
 145     p_input->p_method_data = NULL;
 146
 147     /* Initialize netlist */
 148     if( input_NetlistInit( p_input, NB_DATA, NB_DATA, NB_PES, ES_PACKET_SIZE,
 149                            INPUT_READ_ONCE ) )
 150     {
 151         intf_ErrMsg( "ES input : Could not initialize netlist" );
 152         return;
 153     }
 154
 155     /* FIXME : detect if InitStream failed */
 156     input_InitStream( p_input, 0 );
 157     input_AddProgram( p_input, 0, 0 );
 158     vlc_mutex_lock( &p_input->stream.stream_lock );
 159     p_es = input_AddES( p_input, p_input->stream.pp_programs[0], 0xE0, 0 );
 160     p_es->i_stream_id = 0xE0;
 161     p_es->i_type = MPEG1_VIDEO_ES;
 162     p_es->i_cat = VIDEO_ES;
 163     input_SelectES( p_input, p_es );
 164     p_input->stream.p_selected_area->i_tell = 0;
 165     p_input->stream.pp_programs[0]->b_is_ok = 1;
 166     vlc_mutex_unlock( &p_input->stream.stream_lock );
 167 }
 168
 169 /*****************************************************************************
 170  * ESEnd: frees unused data
 171  *****************************************************************************/
 172 static void ESEnd( input_thread_t * p_input )
 173 {
 174 }
 175
 176 /*****************************************************************************
 177  * ESRead: reads data packets
 178  *****************************************************************************
 179  * Returns -1 in case of error, 0 if everything went well, and 1 in case of
 180  * EOF.
 181  *****************************************************************************/
 182 static int ESRead( input_thread_t * p_input,
 183                    data_packet_t * pp_packets[INPUT_READ_ONCE] )
 184 {
 185     int             i_read;
 186     struct iovec  * p_iovec;
 187
 188     /* Get iovecs */
 189     p_iovec = input_NetlistGetiovec( p_input->p_method_data );
 190
 191     if ( p_iovec == NULL )
 192     {
 193         return( -1 ); /* empty netlist */
 194     }
 195
 196     memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
 197
 198     i_read = readv( p_input->i_handle, p_iovec, INPUT_READ_ONCE );
 199     if( i_read == -1 )
 200     {
 201         intf_ErrMsg( "input error: ES readv error" );
 202         return( -1 );
 203     }
 204
 205     input_NetlistMviovec( p_input->p_method_data,
 206              (int)(i_read/ES_PACKET_SIZE), pp_packets );
 207
 208     p_input->stream.p_selected_area->i_tell += i_read;
 209
 210     return( 0 );
 211 }
 212
 213 /*****************************************************************************
 214  * ESSeek: changes the stream position indicator
 215  *****************************************************************************/
 216 static void ESSeek( input_thread_t * p_input, off_t i_position )
 217 {
 218     lseek( p_input->i_handle, i_position, SEEK_SET );
 219
 220     p_input->stream.p_selected_area->i_tell = i_position;
 221 }
 222
 223 /*****************************************************************************
 224  * ESDemux: fakes a demultiplexer
 225  *****************************************************************************/
 226 static void ESDemux( input_thread_t * p_input, data_packet_t * p_data )
 227 {
 228     pes_packet_t *  p_pes = p_input->pf_new_pes( p_input->p_method_data );
 229     decoder_fifo_t * p_fifo =
 230         p_input->stream.pp_programs[0]->pp_es[0]->p_decoder_fifo;
 231
 232     if( p_pes == NULL )
 233     {
 234         intf_ErrMsg("Out of memory");
 235         p_input->b_error = 1;
 236         return;
 237     }
 238
 239     p_pes->i_rate = p_input->stream.control.i_rate;
 240     p_pes->p_first = p_data;
 241
 242     if( (p_input->stream.pp_programs[0]->i_synchro_state == SYNCHRO_REINIT)
 243          | (input_ClockManageControl( p_input, p_input->stream.pp_programs[0],
 244                                   (mtime_t)0 ) == PAUSE_S) )
 245     {
 246         intf_WarnMsg( 2, "synchro reinit" );
 247         p_pes->i_pts = mdate() + DEFAULT_PTS_DELAY;
 248         p_input->stream.pp_programs[0]->i_synchro_state = SYNCHRO_OK;
 249     }
 250
 251     input_DecodePES( p_fifo, p_pes );
 252
 253     vlc_mutex_lock( &p_fifo->data_lock );
 254     if( ( (DECODER_FIFO_END( *p_fifo ) - DECODER_FIFO_START( *p_fifo ))
 255             & FIFO_SIZE ) >= MAX_PACKETS_IN_FIFO )
 256     {
 257         vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
 258     }
 259     vlc_mutex_unlock( &p_fifo->data_lock );
 260 }
 261
 262 /*****************************************************************************
 263  * ESNextDataPacket: signals the input thread if there isn't enough packets
 264  * available
 265  *****************************************************************************/
 266 static void ESNextDataPacket( bit_stream_t * p_bit_stream )
 267 {
 268     decoder_fifo_t *    p_fifo = p_bit_stream->p_decoder_fifo;
 269     boolean_t           b_new_pes;
 270
 271     /* We are looking for the next data packet that contains real data,
 272      * and not just a PES header */
 273     do
 274     {
 275         /* We were reading the last data packet of this PES packet... It's
 276          * time to jump to the next PES packet */
 277         if( p_bit_stream->p_data->p_next == NULL )
 278         {
 279             /* We are going to read/write the start and end indexes of the
 280              * decoder fifo and to use the fifo's conditional variable,
 281              * that's why we need to take the lock before. */
 282             vlc_mutex_lock( &p_fifo->data_lock );
 283
 284             /* Free the previous PES packet. */
 285             p_fifo->pf_delete_pes( p_fifo->p_packets_mgt,
 286                                    DECODER_FIFO_START( *p_fifo ) );
 287             DECODER_FIFO_INCSTART( *p_fifo );
 288
 289             if( DECODER_FIFO_ISEMPTY( *p_fifo ) )
 290             {
 291                 /* Signal the input thread we're waiting. */
 292                 vlc_cond_signal( &p_fifo->data_wait );
 293
 294                 /* Wait for the input to tell us when we receive a packet. */
 295                 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
 296             }
 297
 298             /* The next byte could be found in the next PES packet */
 299             p_bit_stream->p_data = DECODER_FIFO_START( *p_fifo )->p_first;
 300
 301             vlc_mutex_unlock( &p_fifo->data_lock );
 302
 303             b_new_pes = 1;
 304         }
 305         else
 306         {
 307             /* Perhaps the next data packet of the current PES packet contains
 308              * real data (ie its payload's size is greater than 0). */
 309             p_bit_stream->p_data = p_bit_stream->p_data->p_next;
 310
 311             b_new_pes = 0;
 312         }
 313     } while ( p_bit_stream->p_data->p_payload_start
 314                == p_bit_stream->p_data->p_payload_end );
 315
 316     /* We've found a data packet which contains interesting data... */
 317     p_bit_stream->p_byte = p_bit_stream->p_data->p_payload_start;
 318     p_bit_stream->p_end  = p_bit_stream->p_data->p_payload_end;
 319
 320     /* Call back the decoder. */
 321     if( p_bit_stream->pf_bitstream_callback != NULL )
 322     {
 323         p_bit_stream->pf_bitstream_callback( p_bit_stream, b_new_pes );
 324     }
 325 }
 326
 327 /*****************************************************************************
 328  * ESInitBitstream: changes pf_next_data_packet
 329  *****************************************************************************/
 330 static void ESInitBitstream( bit_stream_t * p_bit_stream,
 331                              decoder_fifo_t * p_decoder_fifo,
 332                         void (* pf_bitstream_callback)( struct bit_stream_s *,
 333                                                         boolean_t ),
 334                             void * p_callback_arg )
 335 {
 336     InitBitstream( p_bit_stream, p_decoder_fifo, pf_bitstream_callback,
 337                    p_callback_arg );
 338     p_bit_stream->pf_next_data_packet = ESNextDataPacket;
 339 }