git.sesse.net Git - vlc/blob - src/input/input_dec.c

   1 /*****************************************************************************
   2  * input_dec.c: Functions for the management of decoders
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VideoLAN
   5  * $Id: input_dec.c,v 1.41 2002/07/31 20:56:52 sam Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>
  28 #include <string.h>                                    /* memcpy(), memset() */
  29 #include <sys/types.h>                                              /* off_t */
  30
  31 #include <vlc/vlc.h>
  32
  33 #include "stream_control.h"
  34 #include "input_ext-dec.h"
  35 #include "input_ext-intf.h"
  36 #include "input_ext-plugins.h"
  37
  38 static decoder_fifo_t * CreateDecoderFifo( input_thread_t *,
  39                                            es_descriptor_t * );
  40 static void             DeleteDecoderFifo( decoder_fifo_t * );
  41
  42 /*****************************************************************************
  43  * input_RunDecoder: spawns a new decoder thread
  44  *****************************************************************************/
  45 decoder_fifo_t * input_RunDecoder( input_thread_t * p_input,
  46                                    es_descriptor_t * p_es )
  47 {
  48     char * psz_plugin;
  49     decoder_fifo_t *p_fifo;
  50
  51     /* Create the decoder configuration structure */
  52     p_fifo = CreateDecoderFifo( p_input, p_es );
  53
  54     if( p_fifo == NULL )
  55     {
  56         msg_Err( p_input, "could not create decoder fifo" );
  57         return NULL;
  58     }
  59
  60     /* Get a suitable module */
  61     psz_plugin = config_GetPsz( p_fifo, "codec" );
  62     p_fifo->p_module = module_Need( p_fifo, "decoder", psz_plugin );
  63     if( psz_plugin ) free( psz_plugin );
  64     if( p_fifo->p_module == NULL )
  65     {
  66         msg_Err( p_fifo, "no suitable decoder module for fourcc `%4.4s'",
  67                        (char*)&p_fifo->i_fourcc );
  68         DeleteDecoderFifo( p_fifo );
  69         vlc_object_destroy( p_fifo );
  70         return NULL;
  71     }
  72
  73     /* Spawn the decoder thread */
  74     if( vlc_thread_create( p_fifo, "decoder", p_fifo->pf_run, 0 ) )
  75     {
  76         msg_Err( p_fifo, "cannot spawn decoder thread \"%s\"",
  77                          p_fifo->p_module->psz_object_name );
  78         module_Unneed( p_fifo, p_fifo->p_module );
  79         return NULL;
  80     }
  81
  82     p_input->stream.b_changed = 1;
  83
  84     return p_fifo;
  85 }
  86
  87
  88 /*****************************************************************************
  89  * input_EndDecoder: kills a decoder thread and waits until it's finished
  90  *****************************************************************************/
  91 void input_EndDecoder( input_thread_t * p_input, es_descriptor_t * p_es )
  92 {
  93     int i_dummy;
  94
  95     p_es->p_decoder_fifo->b_die = 1;
  96
  97     /* Make sure the thread leaves the NextDataPacket() function by
  98      * sending it a few null packets. */
  99     for( i_dummy = 0; i_dummy < PADDING_PACKET_NUMBER; i_dummy++ )
 100     {
 101         input_NullPacket( p_input, p_es );
 102     }
 103
 104     if( p_es->p_pes != NULL )
 105     {
 106         input_DecodePES( p_es->p_decoder_fifo, p_es->p_pes );
 107     }
 108
 109     /* Waiting for the thread to exit */
 110     /* I thought that unlocking was better since thread join can be long
 111      * but it actually creates late pictures and freezes --stef */
 112 //    vlc_mutex_unlock( &p_input->stream.stream_lock );
 113     vlc_thread_join( p_es->p_decoder_fifo );
 114 //    vlc_mutex_lock( &p_input->stream.stream_lock );
 115
 116     /* Delete decoder configuration */
 117     DeleteDecoderFifo( p_es->p_decoder_fifo );
 118
 119     /* Unneed module */
 120     module_Unneed( p_es->p_decoder_fifo, p_es->p_decoder_fifo->p_module );
 121
 122     /* Delete the fifo */
 123     vlc_object_destroy( p_es->p_decoder_fifo );
 124
 125     /* Tell the input there is no more decoder */
 126     p_es->p_decoder_fifo = NULL;
 127
 128     p_input->stream.b_changed = 1;
 129 }
 130
 131 /*****************************************************************************
 132  * input_DecodePES
 133  *****************************************************************************
 134  * Put a PES in the decoder's fifo.
 135  *****************************************************************************/
 136 void input_DecodePES( decoder_fifo_t * p_decoder_fifo, pes_packet_t * p_pes )
 137 {
 138     vlc_mutex_lock( &p_decoder_fifo->data_lock );
 139
 140     p_pes->p_next = NULL;
 141     *p_decoder_fifo->pp_last = p_pes;
 142     p_decoder_fifo->pp_last = &p_pes->p_next;
 143     p_decoder_fifo->i_depth++;
 144
 145     /* Warn the decoder that it's got work to do. */
 146     vlc_cond_signal( &p_decoder_fifo->data_wait );
 147     vlc_mutex_unlock( &p_decoder_fifo->data_lock );
 148 }
 149
 150 /*****************************************************************************
 151  * input_EscapeDiscontinuity: send a NULL packet to the decoders
 152  *****************************************************************************/
 153 void input_EscapeDiscontinuity( input_thread_t * p_input )
 154 {
 155     int     i_es, i;
 156
 157     for( i_es = 0; i_es < p_input->stream.i_selected_es_number; i_es++ )
 158     {
 159         es_descriptor_t * p_es = p_input->stream.pp_selected_es[i_es];
 160
 161         if( p_es->p_decoder_fifo != NULL )
 162         {
 163             for( i = 0; i < PADDING_PACKET_NUMBER; i++ )
 164             {
 165                 input_NullPacket( p_input, p_es );
 166             }
 167         }
 168     }
 169 }
 170
 171 /*****************************************************************************
 172  * input_EscapeAudioDiscontinuity: send a NULL packet to the audio decoders
 173  *****************************************************************************/
 174 void input_EscapeAudioDiscontinuity( input_thread_t * p_input )
 175 {
 176     int     i_es, i;
 177
 178     for( i_es = 0; i_es < p_input->stream.i_selected_es_number; i_es++ )
 179     {
 180         es_descriptor_t * p_es = p_input->stream.pp_selected_es[i_es];
 181
 182         if( p_es->p_decoder_fifo != NULL && p_es->i_cat == AUDIO_ES )
 183         {
 184             for( i = 0; i < PADDING_PACKET_NUMBER; i++ )
 185             {
 186                 input_NullPacket( p_input, p_es );
 187             }
 188         }
 189     }
 190 }
 191
 192 /*****************************************************************************
 193  * CreateDecoderFifo: create a decoder_fifo_t
 194  *****************************************************************************/
 195 static decoder_fifo_t * CreateDecoderFifo( input_thread_t * p_input,
 196                                            es_descriptor_t * p_es )
 197 {
 198     decoder_fifo_t * p_fifo;
 199
 200     /* Decoder FIFO */
 201     p_fifo = vlc_object_create( p_input, VLC_OBJECT_DECODER );
 202     if( p_fifo == NULL )
 203     {
 204         msg_Err( p_input, "out of memory" );
 205         return NULL;
 206     }
 207
 208     /* Select a new ES */
 209     p_input->stream.i_selected_es_number++;
 210     p_input->stream.pp_selected_es = realloc(
 211                                           p_input->stream.pp_selected_es,
 212                                           p_input->stream.i_selected_es_number
 213                                            * sizeof(es_descriptor_t *) );
 214     if( p_input->stream.pp_selected_es == NULL )
 215     {
 216         msg_Err( p_input, "out of memory" );
 217         vlc_object_destroy( p_fifo );
 218         return NULL;
 219     }
 220
 221     p_input->stream.pp_selected_es[p_input->stream.i_selected_es_number - 1]
 222             = p_es;
 223
 224     /* Initialize the p_fifo structure */
 225     vlc_mutex_init( p_input, &p_fifo->data_lock );
 226     vlc_cond_init( p_input, &p_fifo->data_wait );
 227     p_es->p_decoder_fifo = p_fifo;
 228
 229     p_fifo->i_id = p_es->i_id;
 230     p_fifo->i_fourcc = p_es->i_fourcc;
 231     p_fifo->p_demux_data = p_es->p_demux_data;
 232
 233     p_fifo->p_stream_ctrl = &p_input->stream.control;
 234
 235     p_fifo->p_first = NULL;
 236     p_fifo->pp_last = &p_fifo->p_first;
 237     p_fifo->i_depth = 0;
 238     p_fifo->b_die = p_fifo->b_error = 0;
 239     p_fifo->p_packets_mgt = p_input->p_method_data;
 240
 241     vlc_object_attach( p_fifo, p_input );
 242
 243     return p_fifo;
 244 }
 245
 246 /*****************************************************************************
 247  * DeleteDecoderFifo: destroy a decoder_fifo_t
 248  *****************************************************************************/
 249 static void DeleteDecoderFifo( decoder_fifo_t * p_fifo )
 250 {
 251     vlc_object_detach_all( p_fifo );
 252
 253     msg_Dbg( p_fifo, "killing decoder for 0x%x, fourcc `%4.4s', %d PES in FIFO",
 254                      p_fifo->i_id, (char*)&p_fifo->i_fourcc, p_fifo->i_depth );
 255
 256     /* Free all packets still in the decoder fifo. */
 257     input_DeletePES( p_fifo->p_packets_mgt,
 258                      p_fifo->p_first );
 259
 260     /* Destroy the lock and cond */
 261     vlc_cond_destroy( &p_fifo->data_wait );
 262     vlc_mutex_destroy( &p_fifo->data_lock );
 263 }
 264