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         stream_CommonDelete( s );
 103         free( p_sys->psz_name );
 104         free( p_sys );
 105         return NULL;
 106     }
 107
 108     return s;
 109 }
 110
 111 void stream_DemuxSend( stream_t *s, block_t *p_block )
 112 {
 113     stream_sys_t *p_sys = s->p_sys;
 114     if( p_block )
 115         block_FifoPut( p_sys->p_fifo, p_block );
 116 }
 117
 118 static void DStreamDelete( stream_t *s )
 119 {
 120     stream_sys_t *p_sys = s->p_sys;
 121     block_t *p_empty;
 122
 123     vlc_object_kill( s );
 124     if( p_sys->p_demux )
 125         vlc_object_kill( p_sys->p_demux );
 126     p_empty = block_New( s, 1 ); p_empty->i_buffer = 0;
 127     block_FifoPut( p_sys->p_fifo, p_empty );
 128     vlc_thread_join( s );
 129
 130     if( p_sys->p_demux )
 131         demux_Delete( p_sys->p_demux );
 132     if( p_sys->p_block )
 133         block_Release( p_sys->p_block );
 134
 135     block_FifoRelease( p_sys->p_fifo );
 136     free( p_sys->psz_name );
 137     free( p_sys );
 138     stream_CommonDelete( s );
 139 }
 140
 141
 142 static int DStreamRead( stream_t *s, void *p_read, unsigned int i_read )
 143 {
 144     stream_sys_t *p_sys = s->p_sys;
 145     uint8_t *p_out = p_read;
 146     int i_out = 0;
 147
 148     //msg_Dbg( s, "DStreamRead: wanted %d bytes", i_read );
 149
 150     while( !s->b_die && !s->b_error && i_read )
 151     {
 152         block_t *p_block = p_sys->p_block;
 153         int i_copy;
 154
 155         if( !p_block )
 156         {
 157             p_block = block_FifoGet( p_sys->p_fifo );
 158             if( !p_block ) s->b_error = 1;
 159             p_sys->p_block = p_block;
 160         }
 161
 162         if( p_block && i_read )
 163         {
 164             i_copy = __MIN( i_read, p_block->i_buffer );
 165             if( p_out && i_copy ) memcpy( p_out, p_block->p_buffer, i_copy );
 166             i_read -= i_copy;
 167             p_out += i_copy;
 168             i_out += i_copy;
 169             p_block->i_buffer -= i_copy;
 170             p_block->p_buffer += i_copy;
 171
 172             if( !p_block->i_buffer )
 173             {
 174                 block_Release( p_block );
 175                 p_sys->p_block = NULL;
 176             }
 177         }
 178     }
 179
 180     p_sys->i_pos += i_out;
 181     return i_out;
 182 }
 183
 184 static int DStreamPeek( stream_t *s, const uint8_t **pp_peek, unsigned int i_peek )
 185 {
 186     stream_sys_t *p_sys = s->p_sys;
 187     block_t **pp_block = &p_sys->p_block;
 188     int i_out = 0;
 189     *pp_peek = 0;
 190
 191     //msg_Dbg( s, "DStreamPeek: wanted %d bytes", i_peek );
 192
 193     while( !s->b_die && !s->b_error && i_peek )
 194     {
 195         int i_copy;
 196
 197         if( !*pp_block )
 198         {
 199             *pp_block = block_FifoGet( p_sys->p_fifo );
 200             if( !*pp_block ) s->b_error = 1;
 201         }
 202
 203         if( *pp_block && i_peek )
 204         {
 205             i_copy = __MIN( i_peek, (*pp_block)->i_buffer );
 206             i_peek -= i_copy;
 207             i_out += i_copy;
 208
 209             if( i_peek ) pp_block = &(*pp_block)->p_next;
 210         }
 211     }
 212
 213     if( p_sys->p_block )
 214     {
 215         p_sys->p_block = block_ChainGather( p_sys->p_block );
 216         *pp_peek = p_sys->p_block->p_buffer;
 217     }
 218
 219     return i_out;
 220 }
 221
 222 static int DStreamControl( stream_t *s, int i_query, va_list args )
 223 {
 224     stream_sys_t *p_sys = s->p_sys;
 225     uint64_t    *p_i64;
 226     bool *p_b;
 227
 228     switch( i_query )
 229     {
 230         case STREAM_GET_SIZE:
 231             p_i64 = va_arg( args, uint64_t * );
 232             *p_i64 = 0;
 233             return VLC_SUCCESS;
 234
 235         case STREAM_CAN_SEEK:
 236             p_b = (bool*) va_arg( args, bool * );
 237             *p_b = false;
 238             return VLC_SUCCESS;
 239
 240         case STREAM_CAN_FASTSEEK:
 241             p_b = (bool*) va_arg( args, bool * );
 242             *p_b = false;
 243             return VLC_SUCCESS;
 244
 245         case STREAM_GET_POSITION:
 246             p_i64 = va_arg( args, uint64_t * );
 247             *p_i64 = p_sys->i_pos;
 248             return VLC_SUCCESS;
 249
 250         case STREAM_SET_POSITION:
 251         {
 252             uint64_t i64 = va_arg( args, uint64_t );
 253             if( i64 < p_sys->i_pos )
 254                 return VLC_EGENERIC;
 255
 256             uint64_t i_skip = i64 - p_sys->i_pos;
 257             while( i_skip > 0 )
 258             {
 259                 int i_read = DStreamRead( s, NULL, __MIN(i_skip, INT_MAX) );
 260                 if( i_read <= 0 )
 261                     return VLC_EGENERIC;
 262                 i_skip -= i_read;
 263             }
 264             return VLC_SUCCESS;
 265         }
 266
 267         case STREAM_CONTROL_ACCESS:
 268         case STREAM_GET_CONTENT_TYPE:
 269         case STREAM_SET_RECORD_STATE:
 270             return VLC_EGENERIC;
 271
 272         default:
 273             msg_Err( s, "invalid DStreamControl query=0x%x", i_query );
 274             return VLC_EGENERIC;
 275     }
 276 }
 277
 278 static void* DStreamThread( vlc_object_t* p_this )
 279 {
 280     stream_t *s = (stream_t *)p_this;
 281     stream_sys_t *p_sys = s->p_sys;
 282     demux_t *p_demux;
 283     int canc = vlc_savecancel();
 284
 285     /* Create the demuxer */
 286     if( !(p_demux = demux_New( s, s->p_input, "", p_sys->psz_name, "", s, p_sys->out,
 287                                false )) )
 288     {
 289         return NULL;
 290     }
 291
 292     /* stream_Demux cannot apply DVB filters.
 293      * Get all programs and let the E/S output sort them out. */
 294     demux_Control( p_demux, DEMUX_SET_GROUP, -1, NULL );
 295     p_sys->p_demux = p_demux;
 296
 297     /* Main loop */
 298     while( !s->b_die && !p_demux->b_die )
 299     {
 300         if( demux_Demux( p_demux ) <= 0 ) break;
 301     }
 302
 303     vlc_restorecancel( canc );
 304     vlc_object_kill( p_demux );
 305     return NULL;
 306 }
 307