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 1.9 2000/12/21 14:18:15 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             /* File too big. */
 132             if( p_input->stream.i_tell > INPUT_PREPARSE_LENGTH )
 133             {
 134                 break;
 135             }
 136         }
 137         fseek( p_method->stream, 0, SEEK_SET );
 138         vlc_mutex_lock( &p_input->stream.stream_lock );
 139         p_input->stream.pp_programs[0]->b_is_ok = 1;
 140         p_input->stream.i_tell = 0;
 141 #ifdef STATS
 142         input_DumpStream( p_input );
 143 #endif
 144         vlc_mutex_unlock( &p_input->stream.stream_lock );
 145     }
 146     else
 147     {
 148         /* The programs will be added when we read them. */
 149         vlc_mutex_lock( &p_input->stream.stream_lock );
 150         p_input->stream.pp_programs[0]->b_is_ok = 0;
 151         vlc_mutex_unlock( &p_input->stream.stream_lock );
 152     }
 153 }
 154
 155 /*****************************************************************************
 156  * PSEnd: frees unused data
 157  *****************************************************************************/
 158 static void PSEnd( input_thread_t * p_input )
 159 {
 160     free( p_input->stream.p_demux_data );
 161     free( p_input->p_method_data );
 162 }
 163
 164 /*****************************************************************************
 165  * SafeRead: reads a chunk of stream and correctly detects errors
 166  *****************************************************************************/
 167 static __inline__ int SafeRead( input_thread_t * p_input, byte_t * p_buffer,
 168                                 size_t i_len )
 169 {
 170     thread_ps_data_t *  p_method;
 171     int                 i_error;
 172
 173     p_method = (thread_ps_data_t *)p_input->p_method_data;
 174     while( fread( p_buffer, i_len, 1, p_method->stream ) != 1 )
 175     {
 176         if( feof( p_method->stream ) )
 177         {
 178             return( 1 );
 179         }
 180
 181         if( (i_error = ferror( p_method->stream )) )
 182         {
 183             intf_ErrMsg( "Read failed (%s)", strerror(i_error) );
 184             return( -1 );
 185         }
 186     }
 187     vlc_mutex_lock( &p_input->stream.stream_lock );
 188     p_input->stream.i_tell += i_len;
 189     vlc_mutex_unlock( &p_input->stream.stream_lock );
 190     return( 0 );
 191 }
 192
 193 /*****************************************************************************
 194  * PSRead: reads a data packet
 195  *****************************************************************************
 196  * Returns -1 in case of error, 0 if everything went well, and 1 in case of
 197  * EOF.
 198  *****************************************************************************/
 199 static int PSRead( input_thread_t * p_input,
 200                    data_packet_t * pp_packets[INPUT_READ_ONCE] )
 201 {
 202     byte_t              p_header[6];
 203     data_packet_t *     p_data;
 204     size_t              i_packet_size;
 205     int                 i_packet, i_error;
 206     thread_ps_data_t *  p_method;
 207
 208     p_method = (thread_ps_data_t *)p_input->p_method_data;
 209
 210     memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
 211     for( i_packet = 0; i_packet < INPUT_READ_ONCE; i_packet++ )
 212     {
 213         /* Read what we believe to be a packet header. */
 214         if( (i_error = SafeRead( p_input, p_header, 6 )) )
 215         {
 216             return( i_error );
 217         }
 218
 219         if( (U32_AT(p_header) & 0xFFFFFF00) != 0x100L )
 220         {
 221             /* This is not the startcode of a packet. Read the stream
 222              * until we find one. */
 223             u32         i_startcode = U32_AT(p_header);
 224             int         i_dummy;
 225
 226             if( i_startcode )
 227             {
 228                 /* It is common for MPEG-1 streams to pad with zeros
 229                  * (although it is forbidden by the recommendation), so
 230                  * don't bother everybody in this case. */
 231                 intf_WarnMsg( 1, "Garbage at input (%x)\n", i_startcode );
 232             }
 233
 234             while( (i_startcode & 0xFFFFFF00) != 0x100L )
 235             {
 236                 i_startcode <<= 8;
 237                 if( (i_dummy = getc( p_method->stream )) != EOF )
 238                 {
 239                     i_startcode |= i_dummy;
 240                 }
 241                 else
 242                 {
 243                     return( 1 );
 244                 }
 245             }
 246             /* Packet found. */
 247             *(u32 *)p_header = U32_AT(&i_startcode);
 248             if( (i_error = SafeRead( p_input, p_header + 4, 2 )) )
 249             {
 250                 return( i_error );
 251             }
 252         }
 253
 254         if( U32_AT(p_header) != 0x1BA )
 255         {
 256             /* That's the case for all packets, except pack header. */
 257             i_packet_size = U16_AT(&p_header[4]);
 258         }
 259         else
 260         {
 261             /* Pack header. */
 262             if( (p_header[4] & 0xC0) == 0x40 )
 263             {
 264                 /* MPEG-2 */
 265                 i_packet_size = 8;
 266             }
 267             else if( (p_header[4] & 0xF0) == 0x20 )
 268             {
 269                 /* MPEG-1 */
 270                 i_packet_size = 6;
 271             }
 272             else
 273             {
 274                 intf_ErrMsg( "Unable to determine stream type" );
 275                 return( -1 );
 276             }
 277         }
 278
 279         /* Fetch a packet of the appropriate size. */
 280         if( (p_data = NewPacket( p_input, i_packet_size + 6 )) == NULL )
 281         {
 282             intf_ErrMsg( "Out of memory" );
 283             return( -1 );
 284         }
 285
 286         /* Copy the header we already read. */
 287         memcpy( p_data->p_buffer, p_header, 6 );
 288
 289         /* Read the remaining of the packet. */
 290         if( (i_error =
 291                 SafeRead( p_input, p_data->p_buffer + 6, i_packet_size )) )
 292         {
 293             return( i_error );
 294         }
 295
 296         /* In MPEG-2 pack headers we still have to read stuffing bytes. */
 297         if( U32_AT(p_header) == 0x1BA )
 298         {
 299             if( i_packet_size == 8 && (p_data->p_buffer[13] & 0x7) != 0 )
 300             {
 301                 /* MPEG-2 stuffing bytes */
 302                 byte_t      p_garbage[8];
 303                 if( (i_error = SafeRead( p_input, p_garbage,
 304                                          p_data->p_buffer[13] & 0x7)) )
 305                 {
 306                     return( i_error );
 307                 }
 308             }
 309         }
 310
 311         /* Give the packet to the other input stages. */
 312         pp_packets[i_packet] = p_data;
 313     }
 314
 315     return( 0 );
 316 }
 317
 318
 319 /*
 320  * Packet management utilities
 321  */
 322
 323 /*****************************************************************************
 324  * NewPacket: allocates a data packet
 325  *****************************************************************************/
 326 static struct data_packet_s * NewPacket( void * p_garbage,
 327                                          size_t i_size )
 328 {
 329     data_packet_t * p_data;
 330
 331     /* Safety check */
 332     if( i_size > INPUT_MAX_PACKET_SIZE )
 333     {
 334         intf_ErrMsg( "Packet too big (%d)", i_size );
 335         return NULL;
 336     }
 337
 338     if( (p_data = (data_packet_t *)malloc( sizeof(data_packet_t) )) == NULL )
 339     {
 340         intf_DbgMsg( "Out of memory" );
 341         return NULL;
 342     }
 343
 344     if( (p_data->p_buffer = (byte_t *)malloc( i_size )) == NULL )
 345     {
 346         intf_DbgMsg( "Out of memory" );
 347         free( p_data );
 348         return NULL;
 349     }
 350
 351     p_data->p_payload_start = p_data->p_buffer;
 352     p_data->p_payload_end = p_data->p_buffer + i_size;
 353
 354     return( p_data );
 355 }
 356
 357 /*****************************************************************************
 358  * NewPES: allocates a pes packet
 359  *****************************************************************************/
 360 static pes_packet_t * NewPES( void * p_garbage )
 361 {
 362     pes_packet_t * p_pes;
 363
 364     if( (p_pes = (pes_packet_t *)malloc( sizeof(pes_packet_t) )) == NULL )
 365     {
 366         intf_DbgMsg( "Out of memory" );
 367         return NULL;
 368     }
 369
 370     p_pes->b_messed_up = p_pes->b_data_alignment = p_pes->b_discontinuity =
 371         p_pes->b_has_pts = 0;
 372     p_pes->i_pes_size = 0;
 373     p_pes->p_first = NULL;
 374
 375     return( p_pes );
 376 }
 377
 378 /*****************************************************************************
 379  * DeletePacket: deletes a data packet
 380  *****************************************************************************/
 381 static void DeletePacket( void * p_garbage,
 382                           data_packet_t * p_data )
 383 {
 384     ASSERT(p_data);
 385     ASSERT(p_data->p_buffer);
 386     free( p_data->p_buffer );
 387     free( p_data );
 388 }
 389
 390 /*****************************************************************************
 391  * DeletePES: deletes a PES packet and associated data packets
 392  *****************************************************************************/
 393 static void DeletePES( void * p_garbage, pes_packet_t * p_pes )
 394 {
 395     data_packet_t *     p_data;
 396     data_packet_t *     p_next;
 397
 398     p_data = p_pes->p_first;
 399
 400     while( p_data != NULL )
 401     {
 402         p_next = p_data->p_next;
 403         free( p_data->p_buffer );
 404         free( p_data );
 405         p_data = p_next;
 406     }
 407
 408     free( p_pes );
 409 }
 410
 411 /*****************************************************************************
 412  * PSKludge: fakes a PS plugin (FIXME)
 413  *****************************************************************************/
 414 input_capabilities_t * PSKludge( void )
 415 {
 416     input_capabilities_t *  p_plugin;
 417
 418     p_plugin = (input_capabilities_t *)malloc( sizeof(input_capabilities_t) );
 419     p_plugin->pf_init = PSInit;
 420     p_plugin->pf_end = PSEnd;
 421     p_plugin->pf_read = PSRead;
 422     p_plugin->pf_demux = input_DemuxPS; /* FIXME: use i_p_config_t ! */
 423     p_plugin->pf_new_packet = NewPacket;
 424     p_plugin->pf_new_pes = NewPES;
 425     p_plugin->pf_delete_packet = DeletePacket;
 426     p_plugin->pf_delete_pes = DeletePES;
 427     p_plugin->pf_rewind = NULL;
 428     p_plugin->pf_seek = NULL;
 429
 430     return( p_plugin );
 431 }