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 1.28 2002/02/24 20:51:10 gbazin 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     vlc_thread_t thread_id;
  49     char * psz_plugin = NULL;
  50
  51     if( p_es->i_type == MPEG1_AUDIO_ES || p_es->i_type == MPEG2_AUDIO_ES )
  52     {
  53         psz_plugin = config_GetPszVariable( ADEC_MPEG_VAR );
  54     }
  55     if( p_es->i_type == AC3_AUDIO_ES )
  56     {
  57         psz_plugin = config_GetPszVariable( ADEC_AC3_VAR );
  58     }
  59
  60     /* Get a suitable module */
  61     p_es->p_module = module_Need( MODULE_CAPABILITY_DECODER, psz_plugin,
  62                                   (void *)&p_es->i_type );
  63     if( psz_plugin ) free( psz_plugin );
  64     if( p_es->p_module == NULL )
  65     {
  66         intf_ErrMsg( "input error: no suitable decoder module for type 0x%x",
  67                       p_es->i_type );
  68         return( 0 );
  69     }
  70
  71     /* Create the decoder configuration structure */
  72     p_es->p_config = CreateDecoderConfig( p_input, p_es );
  73
  74     if( p_es->p_config == NULL )
  75     {
  76         intf_ErrMsg( "input error: could not create decoder config" );
  77         module_Unneed( p_es->p_module );
  78         return( 0 );
  79     }
  80
  81     /* Spawn the decoder thread */
  82     if ( vlc_thread_create( &thread_id, "decoder",
  83          (vlc_thread_func_t)p_es->p_module->
  84              p_functions->dec.functions.dec.pf_run,
  85          (void *)p_es->p_config) )
  86     {
  87         intf_ErrMsg( "input error: can't spawn decoder thread \"%s\"",
  88                      p_es->p_module->psz_name );
  89         free( p_es->p_config );
  90         module_Unneed( p_es->p_module );
  91         return( 0 );
  92     }
  93
  94     return thread_id;
  95 }
  96
  97
  98 /*****************************************************************************
  99  * input_EndDecoder: kills a decoder thread and waits until it's finished
 100  *****************************************************************************/
 101 void input_EndDecoder( input_thread_t * p_input, es_descriptor_t * p_es )
 102 {
 103     int i_dummy;
 104
 105     p_es->p_decoder_fifo->b_die = 1;
 106
 107     /* Make sure the thread leaves the NextDataPacket() function by
 108      * sending it a few null packets. */
 109     for( i_dummy = 0; i_dummy < PADDING_PACKET_NUMBER; i_dummy++ )
 110     {
 111         input_NullPacket( p_input, p_es );
 112     }
 113
 114     if( p_es->p_pes != NULL )
 115     {
 116         input_DecodePES( p_es->p_decoder_fifo, p_es->p_pes );
 117     }
 118
 119     /* Waiting for the thread to exit */
 120     /* I thought that unlocking was better since thread join can be long
 121      * but it actually creates late pictures and freezes --stef */
 122 //    vlc_mutex_unlock( &p_input->stream.stream_lock );
 123     vlc_thread_join( p_es->thread_id );
 124 //    vlc_mutex_lock( &p_input->stream.stream_lock );
 125
 126     /* Delete decoder configuration */
 127     DeleteDecoderConfig( p_es->p_config );
 128
 129     /* Unneed module */
 130     module_Unneed( p_es->p_module );
 131
 132     /* Tell the input there is no more decoder */
 133     p_es->p_decoder_fifo = NULL;
 134 }
 135
 136 /*****************************************************************************
 137  * input_DecodePES
 138  *****************************************************************************
 139  * Put a PES in the decoder's fifo.
 140  *****************************************************************************/
 141 void input_DecodePES( decoder_fifo_t * p_decoder_fifo, pes_packet_t * p_pes )
 142 {
 143     vlc_mutex_lock( &p_decoder_fifo->data_lock );
 144
 145     p_pes->p_next = NULL;
 146     *p_decoder_fifo->pp_last = p_pes;
 147     p_decoder_fifo->pp_last = &p_pes->p_next;
 148     p_decoder_fifo->i_depth++;
 149
 150     /* Warn the decoder that it's got work to do. */
 151     vlc_cond_signal( &p_decoder_fifo->data_wait );
 152     vlc_mutex_unlock( &p_decoder_fifo->data_lock );
 153 }
 154
 155 /*****************************************************************************
 156  * input_EscapeDiscontinuity: send a NULL packet to the decoders
 157  *****************************************************************************/
 158 void input_EscapeDiscontinuity( input_thread_t * p_input,
 159                                 pgrm_descriptor_t * p_pgrm )
 160 {
 161     int     i_es, i;
 162
 163     for( i_es = 0; i_es < p_pgrm->i_es_number; i_es++ )
 164     {
 165         es_descriptor_t * p_es = p_pgrm->pp_es[i_es];
 166
 167         if( p_es->p_decoder_fifo != NULL )
 168         {
 169             for( i = 0; i < PADDING_PACKET_NUMBER; i++ )
 170             {
 171                 input_NullPacket( p_input, p_es );
 172             }
 173         }
 174     }
 175 }
 176
 177 /*****************************************************************************
 178  * input_EscapeAudioDiscontinuity: send a NULL packet to the audio decoders
 179  *****************************************************************************/
 180 void input_EscapeAudioDiscontinuity( input_thread_t * p_input )
 181 {
 182     int     i_pgrm, i_es, i;
 183
 184     for( i_pgrm = 0; i_pgrm < p_input->stream.i_pgrm_number; i_pgrm++ )
 185     {
 186         pgrm_descriptor_t * p_pgrm = p_input->stream.pp_programs[i_pgrm];
 187
 188         for( i_es = 0; i_es < p_pgrm->i_es_number; i_es++ )
 189         {
 190             es_descriptor_t * p_es = p_pgrm->pp_es[i_es];
 191
 192             if( p_es->p_decoder_fifo != NULL && p_es->b_audio )
 193             {
 194                 for( i = 0; i < PADDING_PACKET_NUMBER; i++ )
 195                 {
 196                     input_NullPacket( p_input, p_es );
 197                 }
 198             }
 199         }
 200     }
 201 }
 202
 203 /*****************************************************************************
 204  * CreateDecoderConfig: create a decoder_config_t
 205  *****************************************************************************/
 206 static decoder_config_t * CreateDecoderConfig( input_thread_t * p_input,
 207                                                es_descriptor_t * p_es )
 208 {
 209     decoder_config_t * p_config;
 210
 211     p_config = (decoder_config_t *)malloc( sizeof(decoder_config_t) );
 212     if( p_config == NULL )
 213     {
 214         intf_ErrMsg( "Unable to allocate memory in CreateDecoderConfig" );
 215         return NULL;
 216     }
 217
 218     /* Decoder FIFO */
 219     if( (p_config->p_decoder_fifo =
 220             (decoder_fifo_t *)malloc( sizeof(decoder_fifo_t) )) == NULL )
 221     {
 222         intf_ErrMsg( "Out of memory" );
 223         free( p_config );
 224         return NULL;
 225     }
 226
 227     /* Select a new ES */
 228     p_input->stream.i_selected_es_number++;
 229     p_input->stream.pp_selected_es = realloc(
 230                                        p_input->stream.pp_selected_es,
 231                                        p_input->stream.i_selected_es_number
 232                                         * sizeof(es_descriptor_t *) );
 233     if( p_input->stream.pp_selected_es == NULL )
 234     {
 235         intf_ErrMsg( "Unable to realloc memory" );
 236         free( p_config->p_decoder_fifo );
 237         free( p_config );
 238         return NULL;
 239     }
 240     p_input->stream.pp_selected_es[p_input->stream.i_selected_es_number - 1]
 241             = p_es;
 242
 243     /* Initialize the p_config structure */
 244     vlc_mutex_init(&p_config->p_decoder_fifo->data_lock);
 245     vlc_cond_init(&p_config->p_decoder_fifo->data_wait);
 246     p_es->p_decoder_fifo = p_config->p_decoder_fifo;
 247
 248     p_config->i_id = p_es->i_id;
 249     p_config->i_type = p_es->i_type;
 250     p_config->p_stream_ctrl = &p_input->stream.control;
 251
 252     p_config->p_decoder_fifo->p_first = NULL;
 253     p_config->p_decoder_fifo->pp_last = &p_config->p_decoder_fifo->p_first;
 254     p_config->p_decoder_fifo->i_depth = 0;
 255     p_config->p_decoder_fifo->b_die = p_config->p_decoder_fifo->b_error = 0;
 256     p_config->p_decoder_fifo->p_packets_mgt = p_input->p_method_data;
 257     p_config->p_decoder_fifo->pf_delete_pes = p_input->pf_delete_pes;
 258
 259     return p_config;
 260 }
 261
 262 /*****************************************************************************
 263  * DeleteDecoderConfig: create a decoder_config_t
 264  *****************************************************************************/
 265 static void DeleteDecoderConfig( decoder_config_t * p_config )
 266 {
 267     intf_StatMsg( "input stats: killing decoder for 0x%x, type 0x%x, %d PES in FIFO",
 268                   p_config->i_id, p_config->i_type,
 269                   p_config->p_decoder_fifo->i_depth );
 270     /* Free all packets still in the decoder fifo. */
 271     p_config->p_decoder_fifo->pf_delete_pes(
 272                         p_config->p_decoder_fifo->p_packets_mgt,
 273                         p_config->p_decoder_fifo->p_first );
 274
 275     /* Destroy the lock and cond */
 276     vlc_cond_destroy( &p_config->p_decoder_fifo->data_wait );
 277     vlc_mutex_destroy( &p_config->p_decoder_fifo->data_lock );
 278
 279     free( p_config->p_decoder_fifo );
 280
 281     free( p_config );
 282 }
 283