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 #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 };
  50
  51 static int  DStreamRead   ( stream_t *, void *p_read, unsigned int i_read );
  52 static int  DStreamPeek   ( stream_t *, const uint8_t **pp_peek, unsigned int i_peek );
  53 static int  DStreamControl( stream_t *, int i_query, va_list );
  54 static void DStreamDelete ( stream_t * );
  55 static void* DStreamThread ( vlc_object_t * );
  56
  57
  58 stream_t *stream_DemuxNew( demux_t *p_demux, const char *psz_demux, es_out_t *out )
  59 {
  60     vlc_object_t *p_obj = VLC_OBJECT(p_demux);
  61     /* We create a stream reader, and launch a thread */
  62     stream_t     *s;
  63     stream_sys_t *p_sys;
  64
  65     s = stream_CommonNew( p_obj );
  66     if( s == NULL )
  67         return NULL;
  68     s->p_input = p_demux->p_input;
  69     s->psz_path  = strdup(""); /* N/A */
  70     s->pf_read   = DStreamRead;
  71     s->pf_peek   = DStreamPeek;
  72     s->pf_control= DStreamControl;
  73     s->pf_destroy= DStreamDelete;
  74
  75     s->p_sys = p_sys = malloc( sizeof( *p_sys) );
  76     if( !s->psz_path || !s->p_sys )
  77     {
  78         stream_CommonDelete( s );
  79         return NULL;
  80     }
  81
  82     p_sys->i_pos = 0;
  83     p_sys->out = out;
  84     p_sys->p_demux = NULL;
  85     p_sys->p_block = NULL;
  86     p_sys->psz_name = strdup( psz_demux );
  87
  88     /* decoder fifo */
  89     if( ( p_sys->p_fifo = block_FifoNew() ) == NULL )
  90     {
  91         stream_CommonDelete( s );
  92         free( p_sys->psz_name );
  93         free( p_sys );
  94         return NULL;
  95     }
  96
  97     vlc_object_attach( s, p_obj );
  98
  99     if( vlc_thread_create( s, "stream out", DStreamThread,
 100                            VLC_THREAD_PRIORITY_INPUT ) )
 101     {
 102         vlc_object_detach( s );
 103         stream_CommonDelete( s );
 104         free( p_sys->psz_name );
 105         free( p_sys );
 106         return NULL;
 107     }
 108
 109     return s;
 110 }
 111
 112 void stream_DemuxSend( stream_t *s, block_t *p_block )
 113 {
 114     stream_sys_t *p_sys = s->p_sys;
 115     if( p_block )
 116         block_FifoPut( p_sys->p_fifo, p_block );
 117 }
 118
 119 static void DStreamDelete( stream_t *s )
 120 {
 121     stream_sys_t *p_sys = s->p_sys;
 122     block_t *p_empty;
 123
 124     vlc_object_kill( s );
 125     if( p_sys->p_demux )
 126         vlc_object_kill( p_sys->p_demux );
 127     p_empty = block_New( s, 1 ); p_empty->i_buffer = 0;
 128     block_FifoPut( p_sys->p_fifo, p_empty );
 129     vlc_thread_join( s );
 130
 131     if( p_sys->p_demux )
 132         demux_Delete( p_sys->p_demux );
 133     if( p_sys->p_block )
 134         block_Release( p_sys->p_block );
 135
 136     block_FifoRelease( p_sys->p_fifo );
 137     free( p_sys->psz_name );
 138     free( p_sys );
 139     vlc_object_detach( s );
 140     stream_CommonDelete( s );
 141 }
 142
 143
 144 static int DStreamRead( stream_t *s, void *p_read, unsigned int i_read )
 145 {
 146     stream_sys_t *p_sys = s->p_sys;
 147     uint8_t *p_out = p_read;
 148     int i_out = 0;
 149
 150     //msg_Dbg( s, "DStreamRead: wanted %d bytes", i_read );
 151
 152     while( !s->b_die && !s->b_error && i_read )
 153     {
 154         block_t *p_block = p_sys->p_block;
 155         int i_copy;
 156
 157         if( !p_block )
 158         {
 159             p_block = block_FifoGet( p_sys->p_fifo );
 160             if( !p_block ) s->b_error = 1;
 161             p_sys->p_block = p_block;
 162         }
 163
 164         if( p_block && i_read )
 165         {
 166             i_copy = __MIN( i_read, p_block->i_buffer );
 167             if( p_out && i_copy ) memcpy( p_out, p_block->p_buffer, i_copy );
 168             i_read -= i_copy;
 169             p_out += i_copy;
 170             i_out += i_copy;
 171             p_block->i_buffer -= i_copy;
 172             p_block->p_buffer += i_copy;
 173
 174             if( !p_block->i_buffer )
 175             {
 176                 block_Release( p_block );
 177                 p_sys->p_block = NULL;
 178             }
 179         }
 180     }
 181
 182     p_sys->i_pos += i_out;
 183     return i_out;
 184 }
 185
 186 static int DStreamPeek( stream_t *s, const uint8_t **pp_peek, unsigned int i_peek )
 187 {
 188     stream_sys_t *p_sys = s->p_sys;
 189     block_t **pp_block = &p_sys->p_block;
 190     int i_out = 0;
 191     *pp_peek = 0;
 192
 193     //msg_Dbg( s, "DStreamPeek: wanted %d bytes", i_peek );
 194
 195     while( !s->b_die && !s->b_error && i_peek )
 196     {
 197         int i_copy;
 198
 199         if( !*pp_block )
 200         {
 201             *pp_block = block_FifoGet( p_sys->p_fifo );
 202             if( !*pp_block ) s->b_error = 1;
 203         }
 204
 205         if( *pp_block && i_peek )
 206         {
 207             i_copy = __MIN( i_peek, (*pp_block)->i_buffer );
 208             i_peek -= i_copy;
 209             i_out += i_copy;
 210
 211             if( i_peek ) pp_block = &(*pp_block)->p_next;
 212         }
 213     }
 214
 215     if( p_sys->p_block )
 216     {
 217         p_sys->p_block = block_ChainGather( p_sys->p_block );
 218         *pp_peek = p_sys->p_block->p_buffer;
 219     }
 220
 221     return i_out;
 222 }
 223
 224 static int DStreamControl( stream_t *s, int i_query, va_list args )
 225 {
 226     stream_sys_t *p_sys = s->p_sys;
 227     uint64_t    *p_i64;
 228     bool *p_b;
 229
 230     switch( i_query )
 231     {
 232         case STREAM_GET_SIZE:
 233             p_i64 = va_arg( args, uint64_t * );
 234             *p_i64 = 0;
 235             return VLC_SUCCESS;
 236
 237         case STREAM_CAN_SEEK:
 238             p_b = (bool*) va_arg( args, bool * );
 239             *p_b = false;
 240             return VLC_SUCCESS;
 241
 242         case STREAM_CAN_FASTSEEK:
 243             p_b = (bool*) va_arg( args, bool * );
 244             *p_b = false;
 245             return VLC_SUCCESS;
 246
 247         case STREAM_GET_POSITION:
 248             p_i64 = va_arg( args, uint64_t * );
 249             *p_i64 = p_sys->i_pos;
 250             return VLC_SUCCESS;
 251
 252         case STREAM_SET_POSITION:
 253         {
 254             uint64_t i64 = va_arg( args, uint64_t );
 255             if( i64 < p_sys->i_pos )
 256                 return VLC_EGENERIC;
 257
 258             uint64_t i_skip = i64 - p_sys->i_pos;
 259             while( i_skip > 0 )
 260             {
 261                 int i_read = DStreamRead( s, NULL, __MIN(i_skip, INT_MAX) );
 262                 if( i_read <= 0 )
 263                     return VLC_EGENERIC;
 264                 i_skip -= i_read;
 265             }
 266             return VLC_SUCCESS;
 267         }
 268
 269         case STREAM_CONTROL_ACCESS:
 270         case STREAM_GET_CONTENT_TYPE:
 271         case STREAM_SET_RECORD_STATE:
 272             return VLC_EGENERIC;
 273
 274         default:
 275             msg_Err( s, "invalid DStreamControl query=0x%x", i_query );
 276             return VLC_EGENERIC;
 277     }
 278 }
 279
 280 static void* DStreamThread( vlc_object_t* p_this )
 281 {
 282     stream_t *s = (stream_t *)p_this;
 283     stream_sys_t *p_sys = s->p_sys;
 284     demux_t *p_demux;
 285     int canc = vlc_savecancel();
 286
 287     /* Create the demuxer */
 288     if( !(p_demux = demux_New( s, s->p_input, "", p_sys->psz_name, "", s, p_sys->out,
 289                                false )) )
 290     {
 291         return NULL;
 292     }
 293
 294     /* stream_Demux cannot apply DVB filters.
 295      * Get all programs and let the E/S output sort them out. */
 296     demux_Control( p_demux, DEMUX_SET_GROUP, -1, NULL );
 297     p_sys->p_demux = p_demux;
 298
 299     /* Main loop */
 300     while( !s->b_die && !p_demux->b_die )
 301     {
 302         if( demux_Demux( p_demux ) <= 0 ) break;
 303     }
 304
 305     vlc_restorecancel( canc );
 306     vlc_object_kill( p_demux );
 307     return NULL;
 308 }
 309