git.sesse.net Git - vlc/blob - src/input/input_ps.c

   1 /*****************************************************************************
   2  * input_ps.c: PS demux and packet management
   3  *****************************************************************************
   4  * Copyright (C) 1998, 1999, 2000 VideoLAN
   5  * $Id: input_ps.c,v 1.7 2000/12/20 16:04:31 massiot Exp $
   6  *
   7  * Authors:
   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 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include "defs.h"
  28
  29 #include <stdlib.h>
  30 #include <netinet/in.h>
  31 #include <string.h>
  32 #include <errno.h>
  33
  34 #include "config.h"
  35 #include "common.h"
  36 #include "threads.h"
  37 #include "mtime.h"
  38
  39 #include "intf_msg.h"
  40
  41 #include "stream_control.h"
  42 #include "input_ext-intf.h"
  43 #include "input_ext-dec.h"
  44
  45 #include "input.h"
  46
  47 #include "input_ps.h"
  48 #include "mpeg_system.h"
  49
  50 #include "debug.h"
  51
  52 /*****************************************************************************
  53  * Local prototypes
  54  *****************************************************************************/
  55 static int  PSProbe     ( struct input_thread_s * );
  56 static int  PSRead      ( struct input_thread_s *,
  57                           data_packet_t * p_packets[INPUT_READ_ONCE] );
  58 static void PSInit      ( struct input_thread_s * );
  59 static void PSEnd       ( struct input_thread_s * );
  60 static struct data_packet_s * NewPacket ( void *, size_t );
  61 static void DeletePacket( void *, struct data_packet_s * );
  62 static void DeletePES   ( void *, struct pes_packet_s * );
  63
  64 /*
  65  * Data reading functions
  66  */
  67
  68 /*****************************************************************************
  69  * PSProbe: verifies that the stream is a PS stream
  70  *****************************************************************************/
  71 static int PSProbe( input_thread_t * p_input )
  72 {
  73     /* verify that the first three bytes are 0x000001, or unscramble and
  74      * re-do. */
  75     return 1;
  76 }
  77
  78 /*****************************************************************************
  79  * PSInit: initializes PS structures
  80  *****************************************************************************/
  81 static void PSInit( input_thread_t * p_input )
  82 {
  83     thread_ps_data_t *  p_method;
  84
  85     if( (p_method =
  86          (thread_ps_data_t *)malloc( sizeof(thread_ps_data_t) )) == NULL )
  87     {
  88         intf_ErrMsg( "Out of memory" );
  89         p_input->b_error = 1;
  90         return;
  91     }
  92
  93     p_input->p_method_data = (void *)p_method;
  94
  95     /* Re-open the socket as a buffered FILE stream */
  96     if( (p_method->stream = fdopen( p_input->i_handle, "r" )) == NULL )
  97     {
  98         intf_ErrMsg( "Cannot open file (%s)", strerror(errno) );
  99         p_input->b_error = 1;
 100         return;
 101     }
 102     fseek( p_method->stream, 0, SEEK_SET );
 103
 104     input_InitStream( p_input, 0 );
 105     input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
 106
 107     if( p_input->stream.b_seekable )
 108     {
 109         /* Pre-parse the stream to gather stream_descriptor_t. */
 110         p_input->stream.pp_programs[0]->b_is_ok = 0;
 111         /* FIXME: don't read all stream (it can be long !) */
 112         while( !p_input->b_die && !p_input->b_error )
 113         {
 114             int                 i_result, i;
 115             data_packet_t *     pp_packets[INPUT_READ_ONCE];
 116
 117             i_result = PSRead( p_input, pp_packets );
 118             if( i_result == 1 ) break;
 119             if( i_result == -1 )
 120             {
 121                 p_input->b_error = 1;
 122                 break;
 123             }
 124
 125             for( i = 0; i < INPUT_READ_ONCE && pp_packets[i] != NULL; i++ )
 126             {
 127                 /* FIXME: use i_p_config_t */
 128                 input_ParsePS( p_input, pp_packets[i] );
 129             }
 130         }
 131         fseek( p_method->stream, 0, SEEK_SET );
 132         vlc_mutex_lock( &p_input->stream.stream_lock );
 133         p_input->stream.pp_programs[0]->b_is_ok = 1;
 134         p_input->stream.i_tell = 0;
 135 #ifdef STATS
 136         input_DumpStream( p_input );
 137 #endif
 138         vlc_mutex_unlock( &p_input->stream.stream_lock );
 139     }
 140     else
 141     {
 142         /* The programs will be added when we read them. */
 143         vlc_mutex_lock( &p_input->stream.stream_lock );
 144         p_input->stream.pp_programs[0]->b_is_ok = 0;
 145         vlc_mutex_unlock( &p_input->stream.stream_lock );
 146     }
 147 }
 148
 149 /*****************************************************************************
 150  * PSEnd: frees unused data
 151  *****************************************************************************/
 152 static void PSEnd( input_thread_t * p_input )
 153 {
 154     free( p_input->stream.p_demux_data );
 155     free( p_input->p_method_data );
 156 }
 157
 158 /*****************************************************************************
 159  * SafeRead: reads a chunk of stream and correctly detects errors
 160  *****************************************************************************/
 161 static __inline__ int SafeRead( input_thread_t * p_input, byte_t * p_buffer,
 162                                 size_t i_len )
 163 {
 164     thread_ps_data_t *  p_method;
 165     int                 i_error;
 166
 167     p_method = (thread_ps_data_t *)p_input->p_method_data;
 168     while( fread( p_buffer, i_len, 1, p_method->stream ) != 1 )
 169     {
 170         if( feof( p_method->stream ) )
 171         {
 172             return( 1 );
 173         }
 174
 175         if( (i_error = ferror( p_method->stream )) )
 176         {
 177             intf_ErrMsg( "Read failed (%s)", strerror(i_error) );
 178             return( -1 );
 179         }
 180     }
 181     vlc_mutex_lock( &p_input->stream.stream_lock );
 182     p_input->stream.i_tell += i_len;
 183     vlc_mutex_unlock( &p_input->stream.stream_lock );
 184     return( 0 );
 185 }
 186
 187 /*****************************************************************************
 188  * PSRead: reads a data packet
 189  *****************************************************************************
 190  * Returns -1 in case of error, 0 if everything went well, and 1 in case of
 191  * EOF.
 192  *****************************************************************************/
 193 static int PSRead( input_thread_t * p_input,
 194                    data_packet_t * pp_packets[INPUT_READ_ONCE] )
 195 {
 196     byte_t              p_header[6];
 197     data_packet_t *     p_data;
 198     size_t              i_packet_size;
 199     int                 i_packet, i_error;
 200     thread_ps_data_t *  p_method;
 201
 202     p_method = (thread_ps_data_t *)p_input->p_method_data;
 203
 204     memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
 205     for( i_packet = 0; i_packet < INPUT_READ_ONCE; i_packet++ )
 206     {
 207         /* Read what we believe to be a packet header. */
 208         if( (i_error = SafeRead( p_input, p_header, 6 )) )
 209         {
 210             return( i_error );
 211         }
 212
 213         if( (U32_AT(p_header) & 0xFFFFFF00) != 0x100L )
 214         {
 215             /* This is not the startcode of a packet. Read the stream
 216              * until we find one. */
 217             u32         i_startcode = U32_AT(p_header);
 218             int         i_dummy;
 219
 220             if( i_startcode )
 221             {
 222                 /* It is common for MPEG-1 streams to pad with zeros
 223                  * (although it is forbidden by the recommendation), so
 224                  * don't bother everybody in this case. */
 225                 intf_WarnMsg( 1, "Garbage at input (%x)\n", i_startcode );
 226             }
 227
 228             while( (i_startcode & 0xFFFFFF00) != 0x100L )
 229             {
 230                 i_startcode <<= 8;
 231                 if( (i_dummy = getc( p_method->stream )) != EOF )
 232                 {
 233                     i_startcode |= i_dummy;
 234                 }
 235                 else
 236                 {
 237                     return( 1 );
 238                 }
 239             }
 240             /* Packet found. */
 241             *(u32 *)p_header = U32_AT(&i_startcode);
 242             if( (i_error = SafeRead( p_input, p_header + 4, 2 )) )
 243             {
 244                 return( i_error );
 245             }
 246         }
 247
 248         if( U32_AT(p_header) != 0x1BA )
 249         {
 250             /* That's the case for all packets, except pack header. */
 251             i_packet_size = U16_AT(&p_header[4]);
 252         }
 253         else
 254         {
 255             /* Pack header. */
 256             if( (p_header[4] & 0xC0) == 0x40 )
 257             {
 258                 /* MPEG-2 */
 259                 i_packet_size = 8;
 260             }
 261             else if( (p_header[4] & 0xF0) == 0x20 )
 262             {
 263                 /* MPEG-1 */
 264                 i_packet_size = 6;
 265             }
 266             else
 267             {
 268                 intf_ErrMsg( "Unable to determine stream type" );
 269                 return( -1 );
 270             }
 271         }
 272
 273         /* Fetch a packet of the appropriate size. */
 274         if( (p_data = NewPacket( p_input, i_packet_size + 6 )) == NULL )
 275         {
 276             intf_ErrMsg( "Out of memory" );
 277             return( -1 );
 278         }
 279
 280         /* Copy the header we already read. */
 281         memcpy( p_data->p_buffer, p_header, 6 );
 282
 283         /* Read the remaining of the packet. */
 284         if( (i_error =
 285                 SafeRead( p_input, p_data->p_buffer + 6, i_packet_size )) )
 286         {
 287             return( i_error );
 288         }
 289
 290         /* In MPEG-2 pack headers we still have to read stuffing bytes. */
 291         if( U32_AT(p_header) == 0x1BA )
 292         {
 293             if( i_packet_size == 8 && (p_data->p_buffer[13] & 0x7) != 0 )
 294             {
 295                 /* MPEG-2 stuffing bytes */
 296                 byte_t      p_garbage[8];
 297                 if( (i_error = SafeRead( p_input, p_garbage,
 298                                          p_data->p_buffer[13] & 0x7)) )
 299                 {
 300                     return( i_error );
 301                 }
 302             }
 303         }
 304
 305         /* Give the packet to the other input stages. */
 306         pp_packets[i_packet] = p_data;
 307     }
 308
 309     return( 0 );
 310 }
 311
 312
 313 /*
 314  * Packet management utilities
 315  */
 316
 317 /*****************************************************************************
 318  * NewPacket: allocates a data packet
 319  *****************************************************************************/
 320 static struct data_packet_s * NewPacket( void * p_garbage,
 321                                          size_t i_size )
 322 {
 323     data_packet_t * p_data;
 324
 325     /* Safety check */
 326     if( i_size > INPUT_MAX_PACKET_SIZE )
 327     {
 328         intf_ErrMsg( "Packet too big (%d)", i_size );
 329         return NULL;
 330     }
 331
 332     if( (p_data = (data_packet_t *)malloc( sizeof(data_packet_t) )) == NULL )
 333     {
 334         intf_DbgMsg( "Out of memory" );
 335         return NULL;
 336     }
 337
 338     if( (p_data->p_buffer = (byte_t *)malloc( i_size )) == NULL )
 339     {
 340         intf_DbgMsg( "Out of memory" );
 341         free( p_data );
 342         return NULL;
 343     }
 344
 345     p_data->p_payload_start = p_data->p_buffer;
 346     p_data->p_payload_end = p_data->p_buffer + i_size;
 347
 348     return( p_data );
 349 }
 350
 351 /*****************************************************************************
 352  * NewPES: allocates a pes packet
 353  *****************************************************************************/
 354 static pes_packet_t * NewPES( void * p_garbage )
 355 {
 356     pes_packet_t * p_pes;
 357
 358     if( (p_pes = (pes_packet_t *)malloc( sizeof(pes_packet_t) )) == NULL )
 359     {
 360         intf_DbgMsg( "Out of memory" );
 361         return NULL;
 362     }
 363
 364     p_pes->b_messed_up = p_pes->b_data_alignment = p_pes->b_discontinuity =
 365         p_pes->b_has_pts = 0;
 366     p_pes->i_pes_size = 0;
 367     p_pes->p_first = NULL;
 368
 369     return( p_pes );
 370 }
 371
 372 /*****************************************************************************
 373  * DeletePacket: deletes a data packet
 374  *****************************************************************************/
 375 static void DeletePacket( void * p_garbage,
 376                           data_packet_t * p_data )
 377 {
 378     ASSERT(p_data);
 379     ASSERT(p_data->p_buffer);
 380     free( p_data->p_buffer );
 381     free( p_data );
 382 }
 383
 384 /*****************************************************************************
 385  * DeletePES: deletes a PES packet and associated data packets
 386  *****************************************************************************/
 387 static void DeletePES( void * p_garbage, pes_packet_t * p_pes )
 388 {
 389     data_packet_t *     p_data;
 390     data_packet_t *     p_next;
 391
 392     p_data = p_pes->p_first;
 393
 394     while( p_data != NULL )
 395     {
 396         p_next = p_data->p_next;
 397         free( p_data->p_buffer );
 398         free( p_data );
 399         p_data = p_next;
 400     }
 401
 402     free( p_pes );
 403 }
 404
 405 /*****************************************************************************
 406  * PSKludge: fakes a PS plugin (FIXME)
 407  *****************************************************************************/
 408 input_capabilities_t * PSKludge( void )
 409 {
 410     input_capabilities_t *  p_plugin;
 411
 412     p_plugin = (input_capabilities_t *)malloc( sizeof(input_capabilities_t) );
 413     p_plugin->pf_init = PSInit;
 414     p_plugin->pf_read = PSRead;
 415     p_plugin->pf_demux = input_DemuxPS; /* FIXME: use i_p_config_t ! */
 416     p_plugin->pf_new_packet = NewPacket;
 417     p_plugin->pf_new_pes = NewPES;
 418     p_plugin->pf_delete_packet = DeletePacket;
 419     p_plugin->pf_delete_pes = DeletePES;
 420     p_plugin->pf_rewind = NULL;
 421     p_plugin->pf_seek = NULL;
 422
 423     return( p_plugin );
 424 }