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( demux_t *p_demux, const char *psz_demux, es_out_t *out )
  58 {
  59     vlc_object_t *p_obj = VLC_OBJECT(p_demux);
  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->p_input = p_demux->p_input;
  68     s->psz_path  = strdup(""); /* N/A */
  69     s->pf_read   = DStreamRead;
  70     s->pf_peek   = DStreamPeek;
  71     s->pf_control= DStreamControl;
  72     s->pf_destroy= DStreamDelete;
  73
  74     s->p_sys = p_sys = malloc( sizeof( *p_sys) );
  75     if( !s->psz_path || !s->p_sys )
  76     {
  77         stream_CommonDelete( s );
  78         return NULL;
  79     }
  80
  81     p_sys->i_pos = 0;
  82     p_sys->out = out;
  83     p_sys->p_demux = NULL;
  84     p_sys->p_block = NULL;
  85     p_sys->psz_name = strdup( psz_demux );
  86
  87     /* decoder fifo */
  88     if( ( p_sys->p_fifo = block_FifoNew() ) == NULL )
  89     {
  90         stream_CommonDelete( s );
  91         free( p_sys->psz_name );
  92         free( p_sys );
  93         return NULL;
  94     }
  95
  96     if( vlc_thread_create( s, "stream out", DStreamThread,
  97                            VLC_THREAD_PRIORITY_INPUT ) )
  98     {
  99         stream_CommonDelete( s );
 100         free( p_sys->psz_name );
 101         free( p_sys );
 102         return NULL;
 103     }
 104
 105     return s;
 106 }
 107
 108 void stream_DemuxSend( stream_t *s, block_t *p_block )
 109 {
 110     stream_sys_t *p_sys = s->p_sys;
 111     if( p_block )
 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     if( p_sys->p_demux )
 122         vlc_object_kill( p_sys->p_demux );
 123     p_empty = block_New( s, 1 ); p_empty->i_buffer = 0;
 124     block_FifoPut( p_sys->p_fifo, p_empty );
 125     vlc_thread_join( s );
 126
 127     if( p_sys->p_demux )
 128         demux_Delete( p_sys->p_demux );
 129     if( p_sys->p_block )
 130         block_Release( p_sys->p_block );
 131
 132     block_FifoRelease( p_sys->p_fifo );
 133     free( p_sys->psz_name );
 134     free( p_sys );
 135
 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( !s->b_die && !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             i_out += i_copy;
 166             p_block->i_buffer -= i_copy;
 167             p_block->p_buffer += i_copy;
 168
 169             if( !p_block->i_buffer )
 170             {
 171                 block_Release( p_block );
 172                 p_sys->p_block = NULL;
 173             }
 174         }
 175     }
 176
 177     p_sys->i_pos += i_out;
 178     return i_out;
 179 }
 180
 181 static int DStreamPeek( stream_t *s, const uint8_t **pp_peek, unsigned int i_peek )
 182 {
 183     stream_sys_t *p_sys = s->p_sys;
 184     block_t **pp_block = &p_sys->p_block;
 185     int i_out = 0;
 186     *pp_peek = 0;
 187
 188     //msg_Dbg( s, "DStreamPeek: wanted %d bytes", i_peek );
 189
 190     while( !s->b_die && !s->b_error && i_peek )
 191     {
 192         int i_copy;
 193
 194         if( !*pp_block )
 195         {
 196             *pp_block = block_FifoGet( p_sys->p_fifo );
 197             if( !*pp_block ) s->b_error = 1;
 198         }
 199
 200         if( *pp_block && i_peek )
 201         {
 202             i_copy = __MIN( i_peek, (*pp_block)->i_buffer );
 203             i_peek -= i_copy;
 204             i_out += i_copy;
 205
 206             if( i_peek ) pp_block = &(*pp_block)->p_next;
 207         }
 208     }
 209
 210     if( p_sys->p_block )
 211     {
 212         p_sys->p_block = block_ChainGather( p_sys->p_block );
 213         *pp_peek = p_sys->p_block->p_buffer;
 214     }
 215
 216     return i_out;
 217 }
 218
 219 static int DStreamControl( stream_t *s, int i_query, va_list args )
 220 {
 221     stream_sys_t *p_sys = s->p_sys;
 222     int64_t    *p_i64;
 223     bool *p_b;
 224
 225     switch( i_query )
 226     {
 227         case STREAM_GET_SIZE:
 228             p_i64 = (int64_t*) va_arg( args, int64_t * );
 229             *p_i64 = 0;
 230             return VLC_SUCCESS;
 231
 232         case STREAM_CAN_SEEK:
 233             p_b = (bool*) va_arg( args, bool * );
 234             *p_b = false;
 235             return VLC_SUCCESS;
 236
 237         case STREAM_CAN_FASTSEEK:
 238             p_b = (bool*) va_arg( args, bool * );
 239             *p_b = false;
 240             return VLC_SUCCESS;
 241
 242         case STREAM_GET_POSITION:
 243             p_i64 = (int64_t*) va_arg( args, int64_t * );
 244             *p_i64 = p_sys->i_pos;
 245             return VLC_SUCCESS;
 246
 247         case STREAM_SET_POSITION:
 248         {
 249             int64_t i64 = (int64_t)va_arg( args, int64_t );
 250             int i_skip;
 251             if( i64 < p_sys->i_pos ) return VLC_EGENERIC;
 252             i_skip = i64 - p_sys->i_pos;
 253
 254             while( i_skip > 0 )
 255             {
 256                 int i_read = DStreamRead( s, NULL, (long)i_skip );
 257                 if( i_read <= 0 ) return VLC_EGENERIC;
 258                 i_skip -= i_read;
 259             }
 260             return VLC_SUCCESS;
 261         }
 262
 263         case STREAM_CONTROL_ACCESS:
 264         case STREAM_GET_CONTENT_TYPE:
 265         case STREAM_SET_RECORD_STATE:
 266             return VLC_EGENERIC;
 267
 268         default:
 269             msg_Err( s, "invalid DStreamControl query=0x%x", i_query );
 270             return VLC_EGENERIC;
 271     }
 272 }
 273
 274 static void* DStreamThread( vlc_object_t* p_this )
 275 {
 276     stream_t *s = (stream_t *)p_this;
 277     stream_sys_t *p_sys = s->p_sys;
 278     demux_t *p_demux;
 279     int canc = vlc_savecancel();
 280
 281     /* Create the demuxer */
 282     if( !(p_demux = demux_New( s, s->p_input, "", p_sys->psz_name, "", s, p_sys->out,
 283                                false )) )
 284     {
 285         return NULL;
 286     }
 287
 288     /* stream_Demux cannot apply DVB filters.
 289      * Get all programs and let the E/S output sort them out. */
 290     demux_Control( p_demux, DEMUX_SET_GROUP, -1, NULL );
 291     p_sys->p_demux = p_demux;
 292
 293     /* Main loop */
 294     while( !s->b_die && !p_demux->b_die )
 295     {
 296         if( demux_Demux( p_demux ) <= 0 ) break;
 297     }
 298
 299     vlc_restorecancel( canc );
 300     vlc_object_kill( p_demux );
 301     return NULL;
 302 }
 303