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->psz_path  = strdup(""); /* N/A */
  68     s->pf_read   = DStreamRead;
  69     s->pf_peek   = DStreamPeek;
  70     s->pf_control= DStreamControl;
  71     s->pf_destroy= DStreamDelete;
  72
  73     s->p_sys = p_sys = malloc( sizeof( *p_sys) );
  74     if( !s->psz_path || !s->p_sys )
  75     {
  76         stream_CommonDelete( s );
  77         return NULL;
  78     }
  79
  80     p_sys->i_pos = 0;
  81     p_sys->out = out;
  82     p_sys->p_demux = NULL;
  83     p_sys->p_block = NULL;
  84     p_sys->psz_name = strdup( psz_demux );
  85
  86     /* decoder fifo */
  87     if( ( p_sys->p_fifo = block_FifoNew() ) == NULL )
  88     {
  89         stream_CommonDelete( s );
  90         free( p_sys->psz_name );
  91         free( p_sys );
  92         return NULL;
  93     }
  94
  95     if( vlc_thread_create( s, "stream out", DStreamThread,
  96                            VLC_THREAD_PRIORITY_INPUT ) )
  97     {
  98         stream_CommonDelete( s );
  99         free( p_sys->psz_name );
 100         free( p_sys );
 101         return NULL;
 102     }
 103
 104     return s;
 105 }
 106
 107 void stream_DemuxSend( stream_t *s, block_t *p_block )
 108 {
 109     stream_sys_t *p_sys = s->p_sys;
 110     if( p_block )
 111         block_FifoPut( p_sys->p_fifo, p_block );
 112 }
 113
 114 static void DStreamDelete( stream_t *s )
 115 {
 116     stream_sys_t *p_sys = s->p_sys;
 117     block_t *p_empty;
 118
 119     vlc_object_kill( s );
 120     if( p_sys->p_demux )
 121         vlc_object_kill( p_sys->p_demux );
 122     p_empty = block_New( s, 1 ); p_empty->i_buffer = 0;
 123     block_FifoPut( p_sys->p_fifo, p_empty );
 124     vlc_thread_join( s );
 125
 126     if( p_sys->p_demux )
 127         demux_Delete( p_sys->p_demux );
 128     if( p_sys->p_block )
 129         block_Release( p_sys->p_block );
 130
 131     block_FifoRelease( p_sys->p_fifo );
 132     free( p_sys->psz_name );
 133     free( p_sys );
 134
 135     stream_CommonDelete( s );
 136 }
 137
 138
 139 static int DStreamRead( stream_t *s, void *p_read, unsigned int i_read )
 140 {
 141     stream_sys_t *p_sys = s->p_sys;
 142     uint8_t *p_out = p_read;
 143     int i_out = 0;
 144
 145     //msg_Dbg( s, "DStreamRead: wanted %d bytes", i_read );
 146
 147     while( !s->b_die && !s->b_error && i_read )
 148     {
 149         block_t *p_block = p_sys->p_block;
 150         int i_copy;
 151
 152         if( !p_block )
 153         {
 154             p_block = block_FifoGet( p_sys->p_fifo );
 155             if( !p_block ) s->b_error = 1;
 156             p_sys->p_block = p_block;
 157         }
 158
 159         if( p_block && i_read )
 160         {
 161             i_copy = __MIN( i_read, p_block->i_buffer );
 162             if( p_out && i_copy ) memcpy( p_out, p_block->p_buffer, i_copy );
 163             i_read -= i_copy;
 164             i_out += i_copy;
 165             p_block->i_buffer -= i_copy;
 166             p_block->p_buffer += i_copy;
 167
 168             if( !p_block->i_buffer )
 169             {
 170                 block_Release( p_block );
 171                 p_sys->p_block = NULL;
 172             }
 173         }
 174     }
 175
 176     p_sys->i_pos += i_out;
 177     return i_out;
 178 }
 179
 180 static int DStreamPeek( stream_t *s, const uint8_t **pp_peek, unsigned int i_peek )
 181 {
 182     stream_sys_t *p_sys = s->p_sys;
 183     block_t **pp_block = &p_sys->p_block;
 184     int i_out = 0;
 185     *pp_peek = 0;
 186
 187     //msg_Dbg( s, "DStreamPeek: wanted %d bytes", i_peek );
 188
 189     while( !s->b_die && !s->b_error && i_peek )
 190     {
 191         int i_copy;
 192
 193         if( !*pp_block )
 194         {
 195             *pp_block = block_FifoGet( p_sys->p_fifo );
 196             if( !*pp_block ) s->b_error = 1;
 197         }
 198
 199         if( *pp_block && i_peek )
 200         {
 201             i_copy = __MIN( i_peek, (*pp_block)->i_buffer );
 202             i_peek -= i_copy;
 203             i_out += i_copy;
 204
 205             if( i_peek ) pp_block = &(*pp_block)->p_next;
 206         }
 207     }
 208
 209     if( p_sys->p_block )
 210     {
 211         p_sys->p_block = block_ChainGather( p_sys->p_block );
 212         *pp_peek = p_sys->p_block->p_buffer;
 213     }
 214
 215     return i_out;
 216 }
 217
 218 static int DStreamControl( stream_t *s, int i_query, va_list args )
 219 {
 220     stream_sys_t *p_sys = s->p_sys;
 221     int64_t    *p_i64;
 222     bool *p_b;
 223
 224     switch( i_query )
 225     {
 226         case STREAM_GET_SIZE:
 227             p_i64 = (int64_t*) va_arg( args, int64_t * );
 228             *p_i64 = 0;
 229             return VLC_SUCCESS;
 230
 231         case STREAM_CAN_SEEK:
 232             p_b = (bool*) va_arg( args, bool * );
 233             *p_b = false;
 234             return VLC_SUCCESS;
 235
 236         case STREAM_CAN_FASTSEEK:
 237             p_b = (bool*) va_arg( args, bool * );
 238             *p_b = false;
 239             return VLC_SUCCESS;
 240
 241         case STREAM_GET_POSITION:
 242             p_i64 = (int64_t*) va_arg( args, int64_t * );
 243             *p_i64 = p_sys->i_pos;
 244             return VLC_SUCCESS;
 245
 246         case STREAM_SET_POSITION:
 247         {
 248             int64_t i64 = (int64_t)va_arg( args, int64_t );
 249             int i_skip;
 250             if( i64 < p_sys->i_pos ) return VLC_EGENERIC;
 251             i_skip = i64 - p_sys->i_pos;
 252
 253             while( i_skip > 0 )
 254             {
 255                 int i_read = DStreamRead( s, NULL, (long)i_skip );
 256                 if( i_read <= 0 ) return VLC_EGENERIC;
 257                 i_skip -= i_read;
 258             }
 259             return VLC_SUCCESS;
 260         }
 261
 262         case STREAM_CONTROL_ACCESS:
 263         case STREAM_GET_CONTENT_TYPE:
 264         case STREAM_SET_RECORD_STATE:
 265             return VLC_EGENERIC;
 266
 267         default:
 268             msg_Err( s, "invalid DStreamControl query=0x%x", i_query );
 269             return VLC_EGENERIC;
 270     }
 271 }
 272
 273 static void* DStreamThread( vlc_object_t* p_this )
 274 {
 275     stream_t *s = (stream_t *)p_this;
 276     stream_sys_t *p_sys = s->p_sys;
 277     demux_t *p_demux;
 278     int canc = vlc_savecancel();
 279
 280     /* Create the demuxer */
 281     if( !(p_demux = demux_New( s, "", p_sys->psz_name, "", s, p_sys->out,
 282                                false )) )
 283     {
 284         return NULL;
 285     }
 286
 287     p_sys->p_demux = p_demux;
 288
 289     /* Main loop */
 290     while( !s->b_die && !p_demux->b_die )
 291     {
 292         if( demux_Demux( p_demux ) <= 0 ) break;
 293     }
 294
 295     vlc_restorecancel( canc );
 296     vlc_object_kill( p_demux );
 297     return NULL;
 298 }
 299