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     vlc_object_attach( s, p_obj );
  97
  98     if( vlc_thread_create( s, "stream out", DStreamThread,
  99                            VLC_THREAD_PRIORITY_INPUT ) )
 100     {
 101         vlc_object_detach( s );
 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     vlc_object_detach( s );
 139     stream_CommonDelete( s );
 140 }
 141
 142
 143 static int DStreamRead( stream_t *s, void *p_read, unsigned int i_read )
 144 {
 145     stream_sys_t *p_sys = s->p_sys;
 146     uint8_t *p_out = p_read;
 147     int i_out = 0;
 148
 149     //msg_Dbg( s, "DStreamRead: wanted %d bytes", i_read );
 150
 151     while( !s->b_die && !s->b_error && i_read )
 152     {
 153         block_t *p_block = p_sys->p_block;
 154         int i_copy;
 155
 156         if( !p_block )
 157         {
 158             p_block = block_FifoGet( p_sys->p_fifo );
 159             if( !p_block ) s->b_error = 1;
 160             p_sys->p_block = p_block;
 161         }
 162
 163         if( p_block && i_read )
 164         {
 165             i_copy = __MIN( i_read, p_block->i_buffer );
 166             if( p_out && i_copy ) memcpy( p_out, p_block->p_buffer, i_copy );
 167             i_read -= i_copy;
 168             p_out += i_copy;
 169             i_out += i_copy;
 170             p_block->i_buffer -= i_copy;
 171             p_block->p_buffer += i_copy;
 172
 173             if( !p_block->i_buffer )
 174             {
 175                 block_Release( p_block );
 176                 p_sys->p_block = NULL;
 177             }
 178         }
 179     }
 180
 181     p_sys->i_pos += i_out;
 182     return i_out;
 183 }
 184
 185 static int DStreamPeek( stream_t *s, const uint8_t **pp_peek, unsigned int i_peek )
 186 {
 187     stream_sys_t *p_sys = s->p_sys;
 188     block_t **pp_block = &p_sys->p_block;
 189     int i_out = 0;
 190     *pp_peek = 0;
 191
 192     //msg_Dbg( s, "DStreamPeek: wanted %d bytes", i_peek );
 193
 194     while( !s->b_die && !s->b_error && i_peek )
 195     {
 196         int i_copy;
 197
 198         if( !*pp_block )
 199         {
 200             *pp_block = block_FifoGet( p_sys->p_fifo );
 201             if( !*pp_block ) s->b_error = 1;
 202         }
 203
 204         if( *pp_block && i_peek )
 205         {
 206             i_copy = __MIN( i_peek, (*pp_block)->i_buffer );
 207             i_peek -= i_copy;
 208             i_out += i_copy;
 209
 210             if( i_peek ) pp_block = &(*pp_block)->p_next;
 211         }
 212     }
 213
 214     if( p_sys->p_block )
 215     {
 216         p_sys->p_block = block_ChainGather( p_sys->p_block );
 217         *pp_peek = p_sys->p_block->p_buffer;
 218     }
 219
 220     return i_out;
 221 }
 222
 223 static int DStreamControl( stream_t *s, int i_query, va_list args )
 224 {
 225     stream_sys_t *p_sys = s->p_sys;
 226     int64_t    *p_i64;
 227     bool *p_b;
 228
 229     switch( i_query )
 230     {
 231         case STREAM_GET_SIZE:
 232             p_i64 = (int64_t*) va_arg( args, int64_t * );
 233             *p_i64 = 0;
 234             return VLC_SUCCESS;
 235
 236         case STREAM_CAN_SEEK:
 237             p_b = (bool*) va_arg( args, bool * );
 238             *p_b = false;
 239             return VLC_SUCCESS;
 240
 241         case STREAM_CAN_FASTSEEK:
 242             p_b = (bool*) va_arg( args, bool * );
 243             *p_b = false;
 244             return VLC_SUCCESS;
 245
 246         case STREAM_GET_POSITION:
 247             p_i64 = (int64_t*) va_arg( args, int64_t * );
 248             *p_i64 = p_sys->i_pos;
 249             return VLC_SUCCESS;
 250
 251         case STREAM_SET_POSITION:
 252         {
 253             int64_t i64 = (int64_t)va_arg( args, int64_t );
 254             int i_skip;
 255             if( i64 < p_sys->i_pos ) return VLC_EGENERIC;
 256             i_skip = i64 - p_sys->i_pos;
 257
 258             while( i_skip > 0 )
 259             {
 260                 int i_read = DStreamRead( s, NULL, (long)i_skip );
 261                 if( i_read <= 0 ) 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