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

   1 /*****************************************************************************
   2  * stream.c
   3  *****************************************************************************
   4  * Copyright (C) 1999-2004 VideoLAN
   5  * $Id: stream.c,v 1.11 2004/01/16 11:12:16 fenrir Exp $
   6  *
   7  * Authors: Laurent Aimar <fenrir@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 #include <stdlib.h>
  25 #include <vlc/vlc.h>
  26 #include <vlc/input.h>
  27
  28 #include "ninput.h"
  29
  30 #define MAX_LINE 1024
  31 /****************************************************************************
  32  * stream_* :
  33  * XXX for now it's just a wrapper
  34  *
  35  ****************************************************************************/
  36
  37 /**
  38  * Handle to a stream.
  39  */
  40 struct stream_t
  41 {
  42     VLC_COMMON_MEMBERS
  43
  44     /** pointer to the input thread */
  45     input_thread_t *p_input;
  46
  47 };
  48
  49 /**
  50  * Create a "stream_t *" from an "input_thread_t *".
  51  */
  52 stream_t *stream_OpenInput( input_thread_t *p_input )
  53 {
  54     stream_t *s;
  55
  56     s = vlc_object_create( p_input, sizeof( stream_t ) );
  57     if( s )
  58     {
  59         s->p_input = p_input;
  60     }
  61
  62     return s;
  63 }
  64
  65 /**
  66  * Destroy a previously created "stream_t *" instance.
  67  */
  68 void stream_Release( stream_t *s )
  69 {
  70     vlc_object_destroy( s );
  71 }
  72
  73 /**
  74  * Similar to #stream_Control(), but takes a va_list and not variable
  75  * arguments.
  76  */
  77 int stream_vaControl( stream_t *s, int i_query, va_list args )
  78 {
  79     vlc_bool_t *p_b;
  80     int64_t    *p_i64, i64;
  81     int        *p_int;
  82
  83     switch( i_query )
  84     {
  85         case STREAM_GET_SIZE:
  86             p_i64 = (int64_t*) va_arg( args, int64_t * );
  87
  88             vlc_mutex_lock( &s->p_input->stream.stream_lock );
  89             *p_i64 = s->p_input->stream.p_selected_area->i_size;
  90             vlc_mutex_unlock( &s->p_input->stream.stream_lock );
  91             return VLC_SUCCESS;
  92
  93         case STREAM_CAN_SEEK:
  94             p_b = (vlc_bool_t*) va_arg( args, vlc_bool_t * );
  95
  96             vlc_mutex_lock( &s->p_input->stream.stream_lock );
  97             *p_b = s->p_input->stream.b_seekable;
  98             vlc_mutex_unlock( &s->p_input->stream.stream_lock );
  99             return VLC_SUCCESS;
 100
 101         case STREAM_CAN_FASTSEEK:
 102             p_b = (vlc_bool_t*) va_arg( args, vlc_bool_t * );
 103
 104             vlc_mutex_lock( &s->p_input->stream.stream_lock );
 105             *p_b = s->p_input->stream.b_seekable &&
 106                    s->p_input->stream.i_method == INPUT_METHOD_FILE;
 107             vlc_mutex_unlock( &s->p_input->stream.stream_lock );
 108             return VLC_SUCCESS;
 109
 110         case STREAM_GET_POSITION:
 111             p_i64 = (int64_t*) va_arg( args, int64_t * );
 112
 113             vlc_mutex_lock( &s->p_input->stream.stream_lock );
 114             *p_i64 = s->p_input->stream.p_selected_area->i_tell;
 115             vlc_mutex_unlock( &s->p_input->stream.stream_lock );
 116             return VLC_SUCCESS;
 117
 118         case STREAM_SET_POSITION:
 119             i64 = (int64_t) va_arg( args, int64_t );
 120
 121             vlc_mutex_lock( &s->p_input->stream.stream_lock );
 122             if( i64 < 0 ||
 123                 ( s->p_input->stream.p_selected_area->i_size > 0 &&
 124                   s->p_input->stream.p_selected_area->i_size < i64 ) )
 125             {
 126                 vlc_mutex_unlock( &s->p_input->stream.stream_lock );
 127                 msg_Warn( s, "seek out of bound" );
 128                 return VLC_EGENERIC;
 129             }
 130             vlc_mutex_unlock( &s->p_input->stream.stream_lock );
 131
 132             if( i64 == s->p_input->stream.p_selected_area->i_tell )
 133             {
 134                 return VLC_SUCCESS;
 135             }
 136
 137             if( s->p_input->stream.b_seekable &&
 138                 ( s->p_input->stream.i_method == INPUT_METHOD_FILE ||
 139                   i64 - s->p_input->stream.p_selected_area->i_tell < 0 ||
 140                   i64 - s->p_input->stream.p_selected_area->i_tell > 4096 ) )
 141             {
 142                 input_AccessReinit( s->p_input );
 143                 s->p_input->pf_seek( s->p_input, i64 );
 144                 return VLC_SUCCESS;
 145             }
 146
 147             if( i64 - s->p_input->stream.p_selected_area->i_tell > 0 )
 148             {
 149                 data_packet_t *p_data;
 150                 int i_skip = i64 - s->p_input->stream.p_selected_area->i_tell;
 151
 152                 if( i_skip > 1000 )
 153                 {
 154                     msg_Warn( s, "will skip %d bytes, slow", i_skip );
 155                 }
 156
 157                 while (i_skip > 0 )
 158                 {
 159                     int i_read;
 160
 161                     i_read = input_SplitBuffer( s->p_input, &p_data,
 162                                  __MIN( (int)s->p_input->i_bufsize, i_skip ) );
 163                     if( i_read < 0 )
 164                     {
 165                         return VLC_EGENERIC;
 166                     }
 167                     i_skip -= i_read;
 168
 169                     input_DeletePacket( s->p_input->p_method_data, p_data );
 170                     if( i_read == 0 && i_skip > 0 )
 171                     {
 172                         return VLC_EGENERIC;
 173                     }
 174                 }
 175             }
 176             return VLC_SUCCESS;
 177
 178         case STREAM_GET_MTU:
 179             p_int = (int*) va_arg( args, int * );
 180             *p_int = s->p_input->i_mtu;
 181             return VLC_SUCCESS;
 182
 183         default:
 184             msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
 185             return VLC_EGENERIC;
 186     }
 187 }
 188
 189 /**
 190  * Use to control the "stream_t *". Look at #stream_query_e for
 191  * possible "i_query" value and format arguments.  Return VLC_SUCCESS
 192  * if ... succeed ;) and VLC_EGENERIC if failed or unimplemented
 193  */
 194 int stream_Control( stream_t *s, int i_query, ... )
 195 {
 196     va_list args;
 197     int     i_result;
 198
 199     va_start( args, i_query );
 200     i_result = stream_vaControl( s, i_query, args );
 201     va_end( args );
 202
 203     return i_result;
 204 }
 205
 206 /**
 207  * Try to read "i_read" bytes into a buffer pointed by "p_read".  If
 208  * "p_read" is NULL then data are skipped instead of read.  The return
 209  * value is the real numbers of bytes read/skip. If this value is less
 210  * than i_read that means that it's the end of the stream.
 211  */
 212 int stream_Read( stream_t *s, void *p_data, int i_data )
 213 {
 214     uint8_t       *p = (uint8_t*)p_data;
 215     data_packet_t *p_packet;
 216
 217     int i_read = 0;
 218
 219     if( p_data == NULL && i_data > 0 )
 220     {
 221         int64_t i_pos;
 222
 223         stream_Control( s, STREAM_GET_POSITION, &i_pos );
 224
 225         i_pos += i_data;
 226         if( stream_Control( s, STREAM_SET_POSITION, i_pos ) )
 227         {
 228             return 0;
 229         }
 230         return i_data;
 231     }
 232
 233     while( i_data > 0 && !s->p_input->b_die )
 234     {
 235         int i_count;
 236
 237         i_count = input_SplitBuffer( s->p_input, &p_packet,
 238                       __MIN( i_data, (int)s->p_input->i_bufsize ) );
 239
 240         if( i_count <= 0 )
 241         {
 242             if( i_count == 0 )
 243                 input_DeletePacket( s->p_input->p_method_data, p_packet );
 244
 245             return i_read;
 246         }
 247
 248         if( p )
 249         {
 250             memcpy( p, p_packet->p_payload_start, i_count );
 251             p += i_count;
 252         }
 253
 254         input_DeletePacket( s->p_input->p_method_data, p_packet );
 255
 256         i_data -= i_count;
 257         i_read += i_count;
 258     }
 259
 260     return i_read;
 261 }
 262
 263 /**
 264  * Store in pp_peek a pointer to the next "i_peek" bytes in the stream
 265  * \return The real numbers of valid bytes, if it's less
 266  * or equal to 0, *pp_peek is invalid.
 267  * \note pp_peek is a pointer to internal buffer and it will be invalid as
 268  * soons as other stream_* functions are called.
 269  * \note Due to input limitation, it could be less than i_peek without meaning
 270  * the end of the stream (but only when you have i_peek >=
 271  * p_input->i_bufsize)
 272  */
 273 int stream_Peek( stream_t *s, uint8_t **pp_peek, int i_peek )
 274 {
 275     return input_Peek( s->p_input, pp_peek, i_peek );
 276 }
 277
 278 /**
 279  * Read "i_size" bytes and store them in a block_t. If less than "i_size"
 280  * bytes are available then return what is left and if nothing is availble,
 281  * return NULL.
 282  */
 283 block_t *stream_Block( stream_t *s, int i_size )
 284 {
 285     block_t *p_block;
 286
 287     if( i_size <= 0 ) return NULL;
 288     if( !(p_block = block_New( s->p_input, i_size ) ) ) return NULL;
 289
 290     p_block->i_buffer = stream_Read( s, p_block->p_buffer, i_size );
 291     if( !p_block->i_buffer )
 292     {
 293         block_Release( p_block );
 294         p_block = NULL;
 295     }
 296
 297     return p_block;
 298 }
 299
 300 /**
 301  * Read from the stream untill first newline.
 302  * \param s Stream handle to read from
 303  * \return A null-terminated string. This must be freed,
 304  */
 305 char *stream_ReadLine( stream_t *s )
 306 {
 307     uint8_t *p_data;
 308     char    *p_line;
 309     int      i_data;
 310     int      i = 0;
 311     i_data = stream_Peek( s, &p_data, MAX_LINE );
 312     msg_Dbg( s->p_input, "i_data %d", i_data );
 313     while( i < i_data && p_data[i] != '\n' )
 314     {
 315         i++;
 316     }
 317     if( i_data <= 0 )
 318     {
 319         return NULL;
 320     }
 321     else
 322     {
 323         p_line = malloc( i + 1 );
 324         if( p_line == NULL )
 325         {
 326             msg_Err( s->p_input, "Out of memory" );
 327             return NULL;
 328         }
 329         i = stream_Read( s, p_line, i + 1 );
 330         p_line[ i - 1 ] = '\0';
 331         msg_Dbg( s->p_input, "found %d chars long line", i );
 332         return p_line;
 333     }
 334 }
 335
 336 /**
 337  * Read "i_size" bytes and store them in a pes_packet_t.  Only fields
 338  * p_first, p_last, i_nb_data, and i_pes_size are set.  (Of course,
 339  * you need to fill i_dts, i_pts, ... ) If only less than "i_size"
 340  * bytes are available NULL is returned.
 341  */
 342 pes_packet_t *stream_PesPacket( stream_t *s, int i_data )
 343 {
 344     pes_packet_t  *p_pes;
 345     data_packet_t *p_packet;
 346
 347
 348     if( !(p_pes = input_NewPES( s->p_input->p_method_data ) ) )
 349     {
 350         return NULL;
 351     }
 352
 353     if( i_data <= 0 )
 354     {
 355         p_pes->p_first =
 356             p_pes->p_last = input_NewPacket( s->p_input->p_method_data, 0 );
 357         p_pes->i_nb_data = 1;
 358         return p_pes;
 359     }
 360
 361     while( i_data > 0 )
 362     {
 363         int i_read;
 364
 365         i_read = input_SplitBuffer( s->p_input, &p_packet,
 366                      __MIN( i_data, (int)s->p_input->i_bufsize ) );
 367         if( i_read <= 0 )
 368         {
 369             /* should occur only with EOF and max allocation reached
 370              * it safer to  return an error */
 371             /* free pes */
 372             input_DeletePES( s->p_input->p_method_data, p_pes );
 373             return NULL;
 374         }
 375
 376         if( p_pes->p_first == NULL )
 377         {
 378             p_pes->p_first = p_packet;
 379         }
 380         else
 381         {
 382             p_pes->p_last->p_next = p_packet;
 383         }
 384         p_pes->p_last = p_packet;
 385         p_pes->i_nb_data++;
 386         p_pes->i_pes_size += i_read;
 387         i_data -= i_read;
 388     }
 389
 390     return p_pes;
 391 }
 392
 393 /**
 394  * Read i_size into a data_packet_t. If b_force is not set, fewer bytes can
 395  * be returned. You should always set b_force, unless you know what you are
 396  * doing.
 397  */
 398 data_packet_t *stream_DataPacket( stream_t *s, int i_size, vlc_bool_t b_force )
 399 {
 400     data_packet_t *p_pk;
 401     int           i_read;
 402
 403     if( i_size <= 0 )
 404     {
 405         p_pk = input_NewPacket( s->p_input->p_method_data, 0 );
 406         if( p_pk )
 407         {
 408             p_pk->p_payload_end = p_pk->p_payload_start;
 409         }
 410         return p_pk;
 411     }
 412
 413     i_read = input_SplitBuffer( s->p_input, &p_pk, i_size );
 414     if( i_read <= 0 )
 415     {
 416         return NULL;
 417     }
 418
 419     /* Should be really rare, near 0 */
 420     if( i_read < i_size && b_force )
 421     {
 422         data_packet_t *p_old = p_pk;
 423         int           i_missing = i_size - i_read;
 424
 425         p_pk = input_NewPacket( s->p_input->p_method_data, i_size );
 426         if( p_pk == NULL )
 427         {
 428             input_DeletePacket( s->p_input->p_method_data, p_old );
 429             return NULL;
 430         }
 431         p_pk->p_payload_end = p_pk->p_payload_start + i_size;
 432         memcpy( p_pk->p_payload_start, p_old->p_payload_start, i_read );
 433         input_DeletePacket( s->p_input->p_method_data, p_old );
 434
 435         if( stream_Read( s, &p_pk->p_payload_start[i_read], i_missing )
 436             < i_missing )
 437         {
 438             input_DeletePacket( s->p_input->p_method_data, p_pk );
 439             return NULL;
 440         }
 441     }
 442
 443     return p_pk;
 444 }