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 1.22 2001/12/30 07:09:56 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 <videolan/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_config_t * CreateDecoderConfig( input_thread_t * p_input,
  39                                                es_descriptor_t * p_es );
  40 static void DeleteDecoderConfig( decoder_config_t * p_config );
  41
  42 /*****************************************************************************
  43  * input_RunDecoder: spawns a new decoder thread
  44  *****************************************************************************/
  45 vlc_thread_t input_RunDecoder( input_thread_t * p_input,
  46                                es_descriptor_t * p_es )
  47 {
  48     probedata_t probedata;
  49     vlc_thread_t thread_id;
  50
  51     /* Get a suitable module */
  52     probedata.i_type = p_es->i_type;
  53
  54     p_es->p_module = module_Need( MODULE_CAPABILITY_DECODER, NULL, &probedata );
  55     if( p_es->p_module == NULL )
  56     {
  57         intf_ErrMsg( "input error: no suitable decoder module for type 0x%x",
  58                       p_es->i_type );
  59         return( 0 );
  60     }
  61
  62     /* Create the decoder configuration structure */
  63     p_es->p_config = CreateDecoderConfig( p_input, p_es );
  64
  65     if( p_es->p_config == NULL )
  66     {
  67         intf_ErrMsg( "input error: could not create decoder config" );
  68         module_Unneed( p_es->p_module );
  69         return( 0 );
  70     }
  71
  72     /* Spawn the decoder thread */
  73     if ( vlc_thread_create( &thread_id, "decoder",
  74          (vlc_thread_func_t)p_es->p_module->
  75              p_functions->dec.functions.dec.pf_run,
  76          (void *)p_es->p_config) )
  77     {
  78         intf_ErrMsg( "input error: can't spawn decoder thread \"%s\"",
  79                      p_es->p_module->psz_name );
  80         free( p_es->p_config );
  81         module_Unneed( p_es->p_module );
  82         return( 0 );
  83     }
  84
  85     intf_DbgMsg( "input debug: decoder \"%s\"thread created",
  86                  p_es->p_module->psz_name );
  87
  88     return thread_id;
  89 }
  90
  91
  92 /*****************************************************************************
  93  * input_EndDecoder: kills a decoder thread and waits until it's finished
  94  *****************************************************************************/
  95 void input_EndDecoder( input_thread_t * p_input, es_descriptor_t * p_es )
  96 {
  97     int i_dummy;
  98
  99     p_es->p_decoder_fifo->b_die = 1;
 100
 101     /* Make sure the thread leaves the NextDataPacket() function by
 102      * sending it a few null packets. */
 103     for( i_dummy = 0; i_dummy < PADDING_PACKET_NUMBER; i_dummy++ )
 104     {
 105         input_NullPacket( p_input, p_es );
 106     }
 107
 108     if( p_es->p_pes != NULL )
 109     {
 110         input_DecodePES( p_es->p_decoder_fifo, p_es->p_pes );
 111     }
 112
 113     /* Waiting for the thread to exit */
 114     /* I thought that unlocking was better since thread join can be long
 115      * but it actually creates late pictures and freezes --stef */
 116 //    vlc_mutex_unlock( &p_input->stream.stream_lock );
 117     vlc_thread_join( p_es->thread_id );
 118 //    vlc_mutex_lock( &p_input->stream.stream_lock );
 119
 120     /* Delete decoder configuration */
 121     DeleteDecoderConfig( p_es->p_config );
 122
 123     /* Unneed module */
 124     module_Unneed( p_es->p_module );
 125
 126     /* Tell the input there is no more decoder */
 127     p_es->p_decoder_fifo = NULL;
 128 }
 129
 130 /*****************************************************************************
 131  * input_DecodePES
 132  *****************************************************************************
 133  * Put a PES in the decoder's fifo.
 134  *****************************************************************************/
 135 void input_DecodePES( decoder_fifo_t * p_decoder_fifo, pes_packet_t * p_pes )
 136 {
 137     vlc_mutex_lock( &p_decoder_fifo->data_lock );
 138
 139     p_pes->p_next = NULL;
 140     *p_decoder_fifo->pp_last = p_pes;
 141     p_decoder_fifo->pp_last = &p_pes->p_next;
 142     p_decoder_fifo->i_depth++;
 143
 144     /* Warn the decoder that it's got work to do. */
 145     vlc_cond_signal( &p_decoder_fifo->data_wait );
 146     vlc_mutex_unlock( &p_decoder_fifo->data_lock );
 147 }
 148
 149 /*****************************************************************************
 150  * input_EscapeDiscontinuity: send a NULL packet to the decoders
 151  *****************************************************************************/
 152 void input_EscapeDiscontinuity( input_thread_t * p_input,
 153                                 pgrm_descriptor_t * p_pgrm )
 154 {
 155     int     i_es, i;
 156
 157     for( i_es = 0; i_es < p_pgrm->i_es_number; i_es++ )
 158     {
 159         es_descriptor_t * p_es = p_pgrm->pp_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_pgrm, i_es, i;
 177
 178     for( i_pgrm = 0; i_pgrm < p_input->stream.i_pgrm_number; i_pgrm++ )
 179     {
 180         pgrm_descriptor_t * p_pgrm = p_input->stream.pp_programs[i_pgrm];
 181
 182         for( i_es = 0; i_es < p_pgrm->i_es_number; i_es++ )
 183         {
 184             es_descriptor_t * p_es = p_pgrm->pp_es[i_es];
 185
 186             if( p_es->p_decoder_fifo != NULL && p_es->b_audio )
 187             {
 188                 for( i = 0; i < PADDING_PACKET_NUMBER; i++ )
 189                 {
 190                     input_NullPacket( p_input, p_es );
 191                 }
 192             }
 193         }
 194     }
 195 }
 196
 197 /*****************************************************************************
 198  * CreateDecoderConfig: create a decoder_config_t
 199  *****************************************************************************/
 200 static decoder_config_t * CreateDecoderConfig( input_thread_t * p_input,
 201                                                es_descriptor_t * p_es )
 202 {
 203     decoder_config_t * p_config;
 204
 205     p_config = (decoder_config_t *)malloc( sizeof(decoder_config_t) );
 206     if( p_config == NULL )
 207     {
 208         intf_ErrMsg( "Unable to allocate memory in CreateDecoderConfig" );
 209         return NULL;
 210     }
 211
 212     /* Decoder FIFO */
 213     if( (p_config->p_decoder_fifo =
 214             (decoder_fifo_t *)malloc( sizeof(decoder_fifo_t) )) == NULL )
 215     {
 216         intf_ErrMsg( "Out of memory" );
 217         free( p_config );
 218         return NULL;
 219     }
 220
 221     /* Select a new ES */
 222     p_input->stream.i_selected_es_number++;
 223     p_input->stream.pp_selected_es = realloc(
 224                                        p_input->stream.pp_selected_es,
 225                                        p_input->stream.i_selected_es_number
 226                                         * sizeof(es_descriptor_t *) );
 227     if( p_input->stream.pp_selected_es == NULL )
 228     {
 229         intf_ErrMsg( "Unable to realloc memory" );
 230         free( p_config->p_decoder_fifo );
 231         free( p_config );
 232         return NULL;
 233     }
 234     p_input->stream.pp_selected_es[p_input->stream.i_selected_es_number - 1]
 235             = p_es;
 236
 237     /* Initialize the p_config structure */
 238     vlc_mutex_init(&p_config->p_decoder_fifo->data_lock);
 239     vlc_cond_init(&p_config->p_decoder_fifo->data_wait);
 240     p_es->p_decoder_fifo = p_config->p_decoder_fifo;
 241
 242     p_config->pf_init_bit_stream = p_input->pf_init_bit_stream;
 243
 244     p_config->i_id = p_es->i_id;
 245     p_config->i_type = p_es->i_type;
 246     p_config->p_stream_ctrl = &p_input->stream.control;
 247
 248     p_config->p_decoder_fifo->p_first = NULL;
 249     p_config->p_decoder_fifo->pp_last = &p_config->p_decoder_fifo->p_first;
 250     p_config->p_decoder_fifo->i_depth = 0;
 251     p_config->p_decoder_fifo->b_die = p_config->p_decoder_fifo->b_error = 0;
 252     p_config->p_decoder_fifo->p_packets_mgt = p_input->p_method_data;
 253     p_config->p_decoder_fifo->pf_delete_pes = p_input->pf_delete_pes;
 254
 255     return p_config;
 256 }
 257
 258 /*****************************************************************************
 259  * DeleteDecoderConfig: create a decoder_config_t
 260  *****************************************************************************/
 261 static void DeleteDecoderConfig( decoder_config_t * p_config )
 262 {
 263     intf_StatMsg( "input stats: killing decoder for 0x%x, type 0x%x, %d PES in FIFO",
 264                   p_config->i_id, p_config->i_type,
 265                   p_config->p_decoder_fifo->i_depth );
 266     /* Free all packets still in the decoder fifo. */
 267     p_config->p_decoder_fifo->pf_delete_pes(
 268                         p_config->p_decoder_fifo->p_packets_mgt,
 269                         p_config->p_decoder_fifo->p_first );
 270
 271     /* Destroy the lock and cond */
 272     vlc_cond_destroy( &p_config->p_decoder_fifo->data_wait );
 273     vlc_mutex_destroy( &p_config->p_decoder_fifo->data_lock );
 274
 275     free( p_config->p_decoder_fifo );
 276
 277     free( p_config );
 278 }
 279