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 #include <limits.h>
  28
  29 #include "demux.h"
  30 #include <libvlc.h>
  31 #include <vlc_codec.h>
  32
  33 /****************************************************************************
  34  * stream_Demux*: create a demuxer for an outpout stream (allow demuxer chain)
  35  ****************************************************************************/
  36 struct stream_sys_t
  37 {
  38     /* Data buffer */
  39     block_fifo_t *p_fifo;
  40     block_t      *p_block;
  41
  42     uint64_t    i_pos;
  43
  44     /* Demuxer */
  45     char        *psz_name;
  46     es_out_t    *out;
  47     demux_t     *p_demux;
  48
  49     vlc_thread_t thread;
  50 };
  51
  52 static int  DStreamRead   ( stream_t *, void *p_read, unsigned int i_read );
  53 static int  DStreamPeek   ( stream_t *, const uint8_t **pp_peek, unsigned int i_peek );
  54 static int  DStreamControl( stream_t *, int i_query, va_list );
  55 static void DStreamDelete ( stream_t * );
  56 static void* DStreamThread ( void * );
  57
  58
  59 stream_t *stream_DemuxNew( demux_t *p_demux, const char *psz_demux, es_out_t *out )
  60 {
  61     vlc_object_t *p_obj = VLC_OBJECT(p_demux);
  62     /* We create a stream reader, and launch a thread */
  63     stream_t     *s;
  64     stream_sys_t *p_sys;
  65
  66     s = stream_CommonNew( p_obj );
  67     if( s == NULL )
  68         return NULL;
  69     s->p_input = p_demux->p_input;
  70     s->psz_path  = strdup(""); /* N/A */
  71     s->pf_read   = DStreamRead;
  72     s->pf_peek   = DStreamPeek;
  73     s->pf_control= DStreamControl;
  74     s->pf_destroy= DStreamDelete;
  75
  76     s->p_sys = p_sys = malloc( sizeof( *p_sys) );
  77     if( !s->psz_path || !s->p_sys )
  78     {
  79         stream_CommonDelete( s );
  80         return NULL;
  81     }
  82
  83     p_sys->i_pos = 0;
  84     p_sys->out = out;
  85     p_sys->p_demux = NULL;
  86     p_sys->p_block = NULL;
  87     p_sys->psz_name = strdup( psz_demux );
  88
  89     /* decoder fifo */
  90     if( ( p_sys->p_fifo = block_FifoNew() ) == NULL )
  91     {
  92         stream_CommonDelete( s );
  93         free( p_sys->psz_name );
  94         free( p_sys );
  95         return NULL;
  96     }
  97
  98     if( vlc_clone( &p_sys->thread, DStreamThread, s, VLC_THREAD_PRIORITY_INPUT ) )
  99     {
 100         stream_CommonDelete( s );
 101         free( p_sys->psz_name );
 102         free( p_sys );
 103         return NULL;
 104     }
 105
 106     return s;
 107 }
 108
 109 void stream_DemuxSend( stream_t *s, block_t *p_block )
 110 {
 111     stream_sys_t *p_sys = s->p_sys;
 112     block_FifoPut( p_sys->p_fifo, p_block );
 113 }
 114
 115 static void DStreamDelete( stream_t *s )
 116 {
 117     stream_sys_t *p_sys = s->p_sys;
 118     block_t *p_empty;
 119
 120     vlc_object_kill( s );
 121 #warning FIXME: not thread-safe:
 122     if( p_sys->p_demux )
 123         vlc_object_kill( p_sys->p_demux );
 124     p_empty = block_New( s, 1 ); p_empty->i_buffer = 0;
 125     block_FifoPut( p_sys->p_fifo, p_empty );
 126     vlc_join( p_sys->thread, NULL );
 127
 128     if( p_sys->p_demux )
 129         demux_Delete( p_sys->p_demux );
 130     if( p_sys->p_block )
 131         block_Release( p_sys->p_block );
 132
 133     block_FifoRelease( p_sys->p_fifo );
 134     free( p_sys->psz_name );
 135     free( p_sys );
 136     stream_CommonDelete( s );
 137 }
 138
 139
 140 static int DStreamRead( stream_t *s, void *p_read, unsigned int i_read )
 141 {
 142     stream_sys_t *p_sys = s->p_sys;
 143     uint8_t *p_out = p_read;
 144     int i_out = 0;
 145
 146     //msg_Dbg( s, "DStreamRead: wanted %d bytes", i_read );
 147
 148     while( vlc_object_alive( s ) && !s->b_error && i_read )
 149     {
 150         block_t *p_block = p_sys->p_block;
 151         int i_copy;
 152
 153         if( !p_block )
 154         {
 155             p_block = block_FifoGet( p_sys->p_fifo );
 156             if( !p_block ) s->b_error = 1;
 157             p_sys->p_block = p_block;
 158         }
 159
 160         if( p_block && i_read )
 161         {
 162             i_copy = __MIN( i_read, p_block->i_buffer );
 163             if( p_out && i_copy ) memcpy( p_out, p_block->p_buffer, i_copy );
 164             i_read -= i_copy;
 165             p_out += i_copy;
 166             i_out += i_copy;
 167             p_block->i_buffer -= i_copy;
 168             p_block->p_buffer += i_copy;
 169
 170             if( !p_block->i_buffer )
 171             {
 172                 block_Release( p_block );
 173                 p_sys->p_block = NULL;
 174             }
 175         }
 176     }
 177
 178     p_sys->i_pos += i_out;
 179     return i_out;
 180 }
 181
 182 static int DStreamPeek( stream_t *s, const uint8_t **pp_peek, unsigned int i_peek )
 183 {
 184     stream_sys_t *p_sys = s->p_sys;
 185     block_t **pp_block = &p_sys->p_block;
 186     int i_out = 0;
 187     *pp_peek = 0;
 188
 189     //msg_Dbg( s, "DStreamPeek: wanted %d bytes", i_peek );
 190
 191     while( vlc_object_alive( s ) && !s->b_error && i_peek )
 192     {
 193         int i_copy;
 194
 195         if( !*pp_block )
 196         {
 197             *pp_block = block_FifoGet( p_sys->p_fifo );
 198             if( !*pp_block ) s->b_error = 1;
 199         }
 200
 201         if( *pp_block && i_peek )
 202         {
 203             i_copy = __MIN( i_peek, (*pp_block)->i_buffer );
 204             i_peek -= i_copy;
 205             i_out += i_copy;
 206
 207             if( i_peek ) pp_block = &(*pp_block)->p_next;
 208         }
 209     }
 210
 211     if( p_sys->p_block )
 212     {
 213         p_sys->p_block = block_ChainGather( p_sys->p_block );
 214         *pp_peek = p_sys->p_block->p_buffer;
 215     }
 216
 217     return i_out;
 218 }
 219
 220 static int DStreamControl( stream_t *s, int i_query, va_list args )
 221 {
 222     stream_sys_t *p_sys = s->p_sys;
 223     uint64_t    *p_i64;
 224     bool *p_b;
 225
 226     switch( i_query )
 227     {
 228         case STREAM_GET_SIZE:
 229             p_i64 = va_arg( args, uint64_t * );
 230             *p_i64 = 0;
 231             return VLC_SUCCESS;
 232
 233         case STREAM_CAN_SEEK:
 234             p_b = (bool*) va_arg( args, bool * );
 235             *p_b = false;
 236             return VLC_SUCCESS;
 237
 238         case STREAM_CAN_FASTSEEK:
 239             p_b = (bool*) va_arg( args, bool * );
 240             *p_b = false;
 241             return VLC_SUCCESS;
 242
 243         case STREAM_GET_POSITION:
 244             p_i64 = va_arg( args, uint64_t * );
 245             *p_i64 = p_sys->i_pos;
 246             return VLC_SUCCESS;
 247
 248         case STREAM_SET_POSITION:
 249         {
 250             uint64_t i64 = va_arg( args, uint64_t );
 251             if( i64 < p_sys->i_pos )
 252                 return VLC_EGENERIC;
 253
 254             uint64_t i_skip = i64 - p_sys->i_pos;
 255             while( i_skip > 0 )
 256             {
 257                 int i_read = DStreamRead( s, NULL, __MIN(i_skip, INT_MAX) );
 258                 if( i_read <= 0 )
 259                     return VLC_EGENERIC;
 260                 i_skip -= i_read;
 261             }
 262             return VLC_SUCCESS;
 263         }
 264
 265         case STREAM_CONTROL_ACCESS:
 266         case STREAM_GET_CONTENT_TYPE:
 267         case STREAM_SET_RECORD_STATE:
 268             return VLC_EGENERIC;
 269
 270         default:
 271             msg_Err( s, "invalid DStreamControl query=0x%x", i_query );
 272             return VLC_EGENERIC;
 273     }
 274 }
 275
 276 static void* DStreamThread( void *obj )
 277 {
 278     stream_t *s = (stream_t *)obj;
 279     stream_sys_t *p_sys = s->p_sys;
 280     demux_t *p_demux;
 281     int canc = vlc_savecancel();
 282
 283     /* Create the demuxer */
 284     if( !(p_demux = demux_New( s, s->p_input, "", p_sys->psz_name, "", s, p_sys->out,
 285                                false )) )
 286     {
 287         return NULL;
 288     }
 289
 290     /* stream_Demux cannot apply DVB filters.
 291      * Get all programs and let the E/S output sort them out. */
 292     demux_Control( p_demux, DEMUX_SET_GROUP, -1, NULL );
 293     p_sys->p_demux = p_demux;
 294
 295     /* Main loop */
 296     while( vlc_object_alive( s ) && vlc_object_alive( p_demux ) )
 297     {
 298         if( demux_Demux( p_demux ) <= 0 ) break;
 299     }
 300
 301     vlc_restorecancel( canc );
 302     vlc_object_kill( p_demux );
 303     return NULL;
 304 }