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 1.5 2001/12/13 17:58:16 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 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  * Declare a buffer manager
  93  *****************************************************************************/
  94 #define FLAGS           BUFFERS_UNIQUE_SIZE
  95 #define NB_LIFO         1
  96 DECLARE_BUFFERS_EMBEDDED( FLAGS, NB_LIFO );
  97 DECLARE_BUFFERS_INIT( FLAGS, NB_LIFO );
  98 DECLARE_BUFFERS_END( FLAGS, NB_LIFO );
  99 DECLARE_BUFFERS_NEWPACKET( FLAGS, NB_LIFO );
 100 DECLARE_BUFFERS_DELETEPACKET( FLAGS, NB_LIFO, 150 );
 101 DECLARE_BUFFERS_NEWPES( FLAGS, NB_LIFO );
 102 DECLARE_BUFFERS_DELETEPES( FLAGS, NB_LIFO, 150, 150 );
 103 DECLARE_BUFFERS_TOIO( FLAGS, ES_PACKET_SIZE );
 104
 105 /*****************************************************************************
 106  * Functions exported as capabilities. They are declared as static so that
 107  * we don't pollute the namespace too much.
 108  *****************************************************************************/
 109 void _M( input_getfunctions )( function_list_t * p_function_list )
 110 {
 111 #define input p_function_list->functions.input
 112     p_function_list->pf_probe = ESProbe;
 113     input.pf_init             = ESInit;
 114     input.pf_open             = NULL;
 115     input.pf_close            = NULL;
 116     input.pf_end              = ESEnd;
 117     input.pf_init_bit_stream  = ESInitBitstream;
 118     input.pf_set_area         = NULL;
 119     input.pf_set_program      = ESSetProgram;
 120     input.pf_read             = ESRead;
 121     input.pf_demux            = ESDemux;
 122     input.pf_new_packet       = input_NewPacket;
 123     input.pf_new_pes          = input_NewPES;
 124     input.pf_delete_packet    = input_DeletePacket;
 125     input.pf_delete_pes       = input_DeletePES;
 126     input.pf_rewind           = NULL;
 127     input.pf_seek             = ESSeek;
 128 #undef input
 129 }
 130
 131 /*
 132  * Data reading functions
 133  */
 134
 135 /*****************************************************************************
 136  * ESProbe: verifies that the stream is a ES stream
 137  *****************************************************************************/
 138 static int ESProbe( probedata_t *p_data )
 139 {
 140     int i_score = 5;
 141
 142     if( TestMethod( INPUT_METHOD_VAR, "es" ) )
 143     {
 144         return( 999 );
 145     }
 146
 147     return( i_score );
 148 }
 149
 150 /*****************************************************************************
 151  * ESInit: initializes ES structures
 152  *****************************************************************************/
 153 static void ESInit( input_thread_t * p_input )
 154 {
 155     es_descriptor_t *   p_es;
 156
 157     p_input->p_method_data = NULL;
 158
 159     if( (p_input->p_method_data = input_BuffersInit()) == NULL )
 160     {
 161         p_input->b_error = 1;
 162         return;
 163     }
 164
 165     /* FIXME : detect if InitStream failed */
 166     input_InitStream( p_input, 0 );
 167     input_AddProgram( p_input, 0, 0 );
 168     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
 169     vlc_mutex_lock( &p_input->stream.stream_lock );
 170     p_es = input_AddES( p_input, p_input->stream.p_selected_program, 0xE0, 0 );
 171     p_es->i_stream_id = 0xE0;
 172     p_es->i_type = MPEG1_VIDEO_ES;
 173     p_es->i_cat = VIDEO_ES;
 174     input_SelectES( p_input, p_es );
 175     p_input->stream.p_selected_area->i_tell = 0;
 176     p_input->stream.p_selected_program->b_is_ok = 1;
 177     vlc_mutex_unlock( &p_input->stream.stream_lock );
 178 }
 179
 180 /*****************************************************************************
 181  * ESEnd: frees unused data
 182  *****************************************************************************/
 183 static void ESEnd( input_thread_t * p_input )
 184 {
 185     input_BuffersEnd( p_input->p_method_data );
 186 }
 187
 188 /*****************************************************************************
 189  * ESRead: reads data packets
 190  *****************************************************************************
 191  * Returns -1 in case of error, 0 if everything went well, and 1 in case of
 192  * EOF.
 193  *****************************************************************************/
 194 static int ESRead( input_thread_t * p_input,
 195                    data_packet_t * pp_packets[INPUT_READ_ONCE] )
 196 {
 197     int             i_read, i_loop;
 198     struct iovec    p_iovec[INPUT_READ_ONCE];
 199     data_packet_t * p_data;
 200
 201     /* Get iovecs */
 202     p_data = input_BuffersToIO( p_input->p_method_data, p_iovec,
 203                                 INPUT_READ_ONCE );
 204
 205     if ( p_data == NULL )
 206     {
 207         return( -1 ); /* empty netlist */
 208     }
 209
 210     memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
 211
 212     i_read = readv( p_input->i_handle, p_iovec, INPUT_READ_ONCE );
 213     if( i_read == -1 )
 214     {
 215         intf_ErrMsg( "input error: ES readv error" );
 216         return( -1 );
 217     }
 218
 219     for( i_loop=0; i_loop * ES_PACKET_SIZE < i_read; i_loop++ )
 220     {
 221         pp_packets[i_loop] = p_data;
 222         p_data = p_data->p_next;
 223         pp_packets[i_loop]->p_next = NULL;
 224     }
 225     for( ; i_loop < INPUT_READ_ONCE ; i_loop++ )
 226     {
 227         data_packet_t * p_next = p_data->p_next;
 228         input_DeletePacket( p_input->p_method_data, p_data );
 229         p_data = p_next;
 230         pp_packets[i_loop] = NULL;
 231     }
 232
 233     /* EOF */
 234     if( i_read == 0 && p_input->stream.b_seekable )
 235     {
 236         return( 1 );
 237     }
 238
 239     p_input->stream.p_selected_area->i_tell += i_read;
 240
 241     return( 0 );
 242 }
 243
 244 /*****************************************************************************
 245  * ESSeek: changes the stream position indicator
 246  *****************************************************************************/
 247 static void ESSeek( input_thread_t * p_input, off_t i_position )
 248 {
 249     lseek( p_input->i_handle, i_position, SEEK_SET );
 250
 251     p_input->stream.p_selected_area->i_tell = i_position;
 252 }
 253
 254
 255 /*****************************************************************************
 256  * ESSetProgram: Does nothing
 257  *****************************************************************************/
 258 static int ESSetProgram( input_thread_t * p_input, pgrm_descriptor_t * p_pgrm )
 259 {
 260     return( 0 );
 261 }
 262
 263 /*****************************************************************************
 264  * ESDemux: fakes a demultiplexer
 265  *****************************************************************************/
 266 static void ESDemux( input_thread_t * p_input, data_packet_t * p_data )
 267 {
 268     pes_packet_t *  p_pes = p_input->pf_new_pes( p_input->p_method_data );
 269     decoder_fifo_t * p_fifo =
 270         p_input->stream.p_selected_program->pp_es[0]->p_decoder_fifo;
 271
 272     if( p_pes == NULL )
 273     {
 274         intf_ErrMsg("Out of memory");
 275         p_input->b_error = 1;
 276         return;
 277     }
 278
 279     p_pes->i_rate = p_input->stream.control.i_rate;
 280     p_pes->p_first = p_pes->p_last = p_data;
 281     p_pes->i_nb_data = 1;
 282
 283     if( (p_input->stream.p_selected_program->i_synchro_state == SYNCHRO_REINIT)
 284          | (input_ClockManageControl( p_input,
 285                           p_input->stream.p_selected_program,
 286                          (mtime_t)0 ) == PAUSE_S) )
 287     {
 288         intf_WarnMsg( 2, "synchro reinit" );
 289         p_pes->i_pts = mdate() + DEFAULT_PTS_DELAY;
 290         p_input->stream.p_selected_program->i_synchro_state = SYNCHRO_OK;
 291     }
 292
 293     input_DecodePES( p_fifo, p_pes );
 294
 295     vlc_mutex_lock( &p_fifo->data_lock );
 296     if( ( (DECODER_FIFO_END( *p_fifo ) - DECODER_FIFO_START( *p_fifo ))
 297             & FIFO_SIZE ) >= MAX_PACKETS_IN_FIFO )
 298     {
 299         vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
 300     }
 301     vlc_mutex_unlock( &p_fifo->data_lock );
 302 }
 303
 304 /*****************************************************************************
 305  * ESNextDataPacket: signals the input thread if there isn't enough packets
 306  * available
 307  *****************************************************************************/
 308 static void ESNextDataPacket( bit_stream_t * p_bit_stream )
 309 {
 310     decoder_fifo_t *    p_fifo = p_bit_stream->p_decoder_fifo;
 311     boolean_t           b_new_pes;
 312
 313     /* We are looking for the next data packet that contains real data,
 314      * and not just a PES header */
 315     do
 316     {
 317         /* We were reading the last data packet of this PES packet... It's
 318          * time to jump to the next PES packet */
 319         if( p_bit_stream->p_data->p_next == NULL )
 320         {
 321             /* We are going to read/write the start and end indexes of the
 322              * decoder fifo and to use the fifo's conditional variable,
 323              * that's why we need to take the lock before. */
 324             vlc_mutex_lock( &p_fifo->data_lock );
 325
 326             /* Free the previous PES packet. */
 327             p_fifo->pf_delete_pes( p_fifo->p_packets_mgt,
 328                                    DECODER_FIFO_START( *p_fifo ) );
 329             DECODER_FIFO_INCSTART( *p_fifo );
 330
 331             if( DECODER_FIFO_ISEMPTY( *p_fifo ) )
 332             {
 333                 /* Signal the input thread we're waiting. */
 334                 vlc_cond_signal( &p_fifo->data_wait );
 335
 336                 /* Wait for the input to tell us when we receive a packet. */
 337                 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
 338             }
 339
 340             /* The next byte could be found in the next PES packet */
 341             p_bit_stream->p_data = DECODER_FIFO_START( *p_fifo )->p_first;
 342
 343             vlc_mutex_unlock( &p_fifo->data_lock );
 344
 345             b_new_pes = 1;
 346         }
 347         else
 348         {
 349             /* Perhaps the next data packet of the current PES packet contains
 350              * real data (ie its payload's size is greater than 0). */
 351             p_bit_stream->p_data = p_bit_stream->p_data->p_next;
 352
 353             b_new_pes = 0;
 354         }
 355     } while ( p_bit_stream->p_data->p_payload_start
 356                == p_bit_stream->p_data->p_payload_end );
 357
 358     /* We've found a data packet which contains interesting data... */
 359     p_bit_stream->p_byte = p_bit_stream->p_data->p_payload_start;
 360     p_bit_stream->p_end  = p_bit_stream->p_data->p_payload_end;
 361
 362     /* Call back the decoder. */
 363     if( p_bit_stream->pf_bitstream_callback != NULL )
 364     {
 365         p_bit_stream->pf_bitstream_callback( p_bit_stream, b_new_pes );
 366     }
 367 }
 368
 369 /*****************************************************************************
 370  * ESInitBitstream: changes pf_next_data_packet
 371  *****************************************************************************/
 372 static void ESInitBitstream( bit_stream_t * p_bit_stream,
 373                              decoder_fifo_t * p_decoder_fifo,
 374                         void (* pf_bitstream_callback)( struct bit_stream_s *,
 375                                                         boolean_t ),
 376                             void * p_callback_arg )
 377 {
 378     InitBitstream( p_bit_stream, p_decoder_fifo, pf_bitstream_callback,
 379                    p_callback_arg );
 380     p_bit_stream->pf_next_data_packet = ESNextDataPacket;
 381 }