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

   1 /*****************************************************************************
   2  * stream_demux.c
   3  *****************************************************************************
   4  * Copyright (C) 1999-2008 the VideoLAN team
   5  * $Id$
   6  *
   7  * Author: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include "demux.h"
  29 #include <libvlc.h>
  30 #include <vlc_codec.h>
  31
  32 /****************************************************************************
  33  * stream_Demux*: create a demuxer for an outpout stream (allow demuxer chain)
  34  ****************************************************************************/
  35 struct stream_sys_t
  36 {
  37     /* Data buffer */
  38     block_fifo_t *p_fifo;
  39     block_t      *p_block;
  40
  41     int64_t     i_pos;
  42
  43     /* Demuxer */
  44     char        *psz_name;
  45     es_out_t    *out;
  46     demux_t     *p_demux;
  47
  48 };
  49
  50 static int  DStreamRead   ( stream_t *, void *p_read, unsigned int i_read );
  51 static int  DStreamPeek   ( stream_t *, const uint8_t **pp_peek, unsigned int i_peek );
  52 static int  DStreamControl( stream_t *, int i_query, va_list );
  53 static void DStreamDelete ( stream_t * );
  54 static void* DStreamThread ( vlc_object_t * );
  55
  56
  57 stream_t *__stream_DemuxNew( vlc_object_t *p_obj, const char *psz_demux,
  58                              es_out_t *out )
  59 {
  60     /* We create a stream reader, and launch a thread */
  61     stream_t     *s;
  62     stream_sys_t *p_sys;
  63
  64     s = stream_CommonNew( p_obj );
  65     if( s == NULL )
  66         return NULL;
  67     s->pf_read   = DStreamRead;
  68     s->pf_peek   = DStreamPeek;
  69     s->pf_control= DStreamControl;
  70     s->pf_destroy= DStreamDelete;
  71
  72     s->p_sys = p_sys = malloc( sizeof( *p_sys) );
  73     if( s->p_sys == NULL )
  74     {
  75         stream_CommonDelete( s );
  76         return NULL;
  77     }
  78
  79     p_sys->i_pos = 0;
  80     p_sys->out = out;
  81     p_sys->p_demux = NULL;
  82     p_sys->p_block = NULL;
  83     p_sys->psz_name = strdup( psz_demux );
  84
  85     /* decoder fifo */
  86     if( ( p_sys->p_fifo = block_FifoNew() ) == NULL )
  87     {
  88         stream_CommonDelete( s );
  89         free( p_sys->psz_name );
  90         free( p_sys );
  91         return NULL;
  92     }
  93
  94     if( vlc_thread_create( s, "stream out", DStreamThread,
  95                            VLC_THREAD_PRIORITY_INPUT ) )
  96     {
  97         stream_CommonDelete( s );
  98         free( p_sys->psz_name );
  99         free( p_sys );
 100         return NULL;
 101     }
 102
 103     return s;
 104 }
 105
 106 void stream_DemuxSend( stream_t *s, block_t *p_block )
 107 {
 108     stream_sys_t *p_sys = s->p_sys;
 109     if( p_block )
 110         block_FifoPut( p_sys->p_fifo, p_block );
 111 }
 112
 113 static void DStreamDelete( stream_t *s )
 114 {
 115     stream_sys_t *p_sys = s->p_sys;
 116     block_t *p_empty;
 117
 118     vlc_object_kill( s );
 119     if( p_sys->p_demux )
 120         vlc_object_kill( p_sys->p_demux );
 121     p_empty = block_New( s, 1 ); p_empty->i_buffer = 0;
 122     block_FifoPut( p_sys->p_fifo, p_empty );
 123     vlc_thread_join( s );
 124
 125     if( p_sys->p_demux )
 126         demux_Delete( p_sys->p_demux );
 127     if( p_sys->p_block )
 128         block_Release( p_sys->p_block );
 129
 130     block_FifoRelease( p_sys->p_fifo );
 131     free( p_sys->psz_name );
 132     free( p_sys );
 133
 134     stream_CommonDelete( s );
 135 }
 136
 137
 138 static int DStreamRead( stream_t *s, void *p_read, unsigned int i_read )
 139 {
 140     stream_sys_t *p_sys = s->p_sys;
 141     uint8_t *p_out = p_read;
 142     int i_out = 0;
 143
 144     //msg_Dbg( s, "DStreamRead: wanted %d bytes", i_read );
 145
 146     while( !s->b_die && !s->b_error && i_read )
 147     {
 148         block_t *p_block = p_sys->p_block;
 149         int i_copy;
 150
 151         if( !p_block )
 152         {
 153             p_block = block_FifoGet( p_sys->p_fifo );
 154             if( !p_block ) s->b_error = 1;
 155             p_sys->p_block = p_block;
 156         }
 157
 158         if( p_block && i_read )
 159         {
 160             i_copy = __MIN( i_read, p_block->i_buffer );
 161             if( p_out && i_copy ) memcpy( p_out, p_block->p_buffer, i_copy );
 162             i_read -= i_copy;
 163             i_out += i_copy;
 164             p_block->i_buffer -= i_copy;
 165             p_block->p_buffer += i_copy;
 166
 167             if( !p_block->i_buffer )
 168             {
 169                 block_Release( p_block );
 170                 p_sys->p_block = NULL;
 171             }
 172         }
 173     }
 174
 175     p_sys->i_pos += i_out;
 176     return i_out;
 177 }
 178
 179 static int DStreamPeek( stream_t *s, const uint8_t **pp_peek, unsigned int i_peek )
 180 {
 181     stream_sys_t *p_sys = s->p_sys;
 182     block_t **pp_block = &p_sys->p_block;
 183     int i_out = 0;
 184     *pp_peek = 0;
 185
 186     //msg_Dbg( s, "DStreamPeek: wanted %d bytes", i_peek );
 187
 188     while( !s->b_die && !s->b_error && i_peek )
 189     {
 190         int i_copy;
 191
 192         if( !*pp_block )
 193         {
 194             *pp_block = block_FifoGet( p_sys->p_fifo );
 195             if( !*pp_block ) s->b_error = 1;
 196         }
 197
 198         if( *pp_block && i_peek )
 199         {
 200             i_copy = __MIN( i_peek, (*pp_block)->i_buffer );
 201             i_peek -= i_copy;
 202             i_out += i_copy;
 203
 204             if( i_peek ) pp_block = &(*pp_block)->p_next;
 205         }
 206     }
 207
 208     if( p_sys->p_block )
 209     {
 210         p_sys->p_block = block_ChainGather( p_sys->p_block );
 211         *pp_peek = p_sys->p_block->p_buffer;
 212     }
 213
 214     return i_out;
 215 }
 216
 217 static int DStreamControl( stream_t *s, int i_query, va_list args )
 218 {
 219     stream_sys_t *p_sys = s->p_sys;
 220     int64_t    *p_i64;
 221     bool *p_b;
 222
 223     switch( i_query )
 224     {
 225         case STREAM_GET_SIZE:
 226             p_i64 = (int64_t*) va_arg( args, int64_t * );
 227             *p_i64 = 0;
 228             return VLC_SUCCESS;
 229
 230         case STREAM_CAN_SEEK:
 231             p_b = (bool*) va_arg( args, bool * );
 232             *p_b = false;
 233             return VLC_SUCCESS;
 234
 235         case STREAM_CAN_FASTSEEK:
 236             p_b = (bool*) va_arg( args, bool * );
 237             *p_b = false;
 238             return VLC_SUCCESS;
 239
 240         case STREAM_GET_POSITION:
 241             p_i64 = (int64_t*) va_arg( args, int64_t * );
 242             *p_i64 = p_sys->i_pos;
 243             return VLC_SUCCESS;
 244
 245         case STREAM_SET_POSITION:
 246         {
 247             int64_t i64 = (int64_t)va_arg( args, int64_t );
 248             int i_skip;
 249             if( i64 < p_sys->i_pos ) return VLC_EGENERIC;
 250             i_skip = i64 - p_sys->i_pos;
 251
 252             while( i_skip > 0 )
 253             {
 254                 int i_read = DStreamRead( s, NULL, (long)i_skip );
 255                 if( i_read <= 0 ) return VLC_EGENERIC;
 256                 i_skip -= i_read;
 257             }
 258             return VLC_SUCCESS;
 259         }
 260
 261         case STREAM_CONTROL_ACCESS:
 262         case STREAM_GET_CONTENT_TYPE:
 263         case STREAM_SET_RECORD_STATE:
 264             return VLC_EGENERIC;
 265
 266         default:
 267             msg_Err( s, "invalid DStreamControl query=0x%x", i_query );
 268             return VLC_EGENERIC;
 269     }
 270 }
 271
 272 static void* DStreamThread( vlc_object_t* p_this )
 273 {
 274     stream_t *s = (stream_t *)p_this;
 275     stream_sys_t *p_sys = s->p_sys;
 276     demux_t *p_demux;
 277     int canc = vlc_savecancel();
 278
 279     /* Create the demuxer */
 280     if( !(p_demux = demux_New( s, "", p_sys->psz_name, "", s, p_sys->out,
 281                                false )) )
 282     {
 283         return NULL;
 284     }
 285
 286     p_sys->p_demux = p_demux;
 287
 288     /* Main loop */
 289     while( !s->b_die && !p_demux->b_die )
 290     {
 291         if( demux_Demux( p_demux ) <= 0 ) break;
 292     }
 293
 294     vlc_restorecancel( canc );
 295     vlc_object_kill( p_demux );
 296     return NULL;
 297 }
 298