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 1.37 2002/06/01 12:32:01 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 = NULL;
  49
  50     if( p_es->i_type == MPEG1_AUDIO_ES || p_es->i_type == MPEG2_AUDIO_ES )
  51     {
  52         psz_plugin = config_GetPsz( p_input, "mpeg-adec" );
  53     }
  54     if( p_es->i_type == AC3_AUDIO_ES )
  55     {
  56         psz_plugin = config_GetPsz( p_input, "ac3-adec" );
  57     }
  58
  59     /* Get a suitable module */
  60     p_es->p_module = module_Need( p_input, MODULE_CAPABILITY_DECODER,
  61                                   psz_plugin, (void *)&p_es->i_type );
  62     if( psz_plugin ) free( psz_plugin );
  63     if( p_es->p_module == NULL )
  64     {
  65         msg_Err( p_input, "no suitable decoder module for type 0x%x",
  66                           p_es->i_type );
  67         return NULL;
  68     }
  69
  70     /* Create the decoder configuration structure */
  71     p_es->p_decoder_fifo = CreateDecoderFifo( p_input, p_es );
  72
  73     if( p_es->p_decoder_fifo == NULL )
  74     {
  75         msg_Err( p_input, "could not create decoder fifo" );
  76         module_Unneed( p_es->p_module );
  77         return NULL;
  78     }
  79
  80     /* Spawn the decoder thread */
  81     if ( vlc_thread_create( p_es->p_decoder_fifo, "decoder",
  82                  p_es->p_module->p_functions->dec.functions.dec.pf_run, 0 ) )
  83     {
  84         msg_Err( p_input, "cannot spawn decoder thread \"%s\"",
  85                            p_es->p_module->psz_object_name );
  86         DeleteDecoderFifo( p_es->p_decoder_fifo );
  87         module_Unneed( p_es->p_module );
  88         return NULL;
  89     }
  90
  91     p_input->stream.b_changed = 1;
  92
  93     return p_es->p_decoder_fifo;
  94 }
  95
  96
  97 /*****************************************************************************
  98  * input_EndDecoder: kills a decoder thread and waits until it's finished
  99  *****************************************************************************/
 100 void input_EndDecoder( input_thread_t * p_input, es_descriptor_t * p_es )
 101 {
 102     int i_dummy;
 103
 104     p_es->p_decoder_fifo->b_die = 1;
 105
 106     /* Make sure the thread leaves the NextDataPacket() function by
 107      * sending it a few null packets. */
 108     for( i_dummy = 0; i_dummy < PADDING_PACKET_NUMBER; i_dummy++ )
 109     {
 110         input_NullPacket( p_input, p_es );
 111     }
 112
 113     if( p_es->p_pes != NULL )
 114     {
 115         input_DecodePES( p_es->p_decoder_fifo, p_es->p_pes );
 116     }
 117
 118     /* Waiting for the thread to exit */
 119     /* I thought that unlocking was better since thread join can be long
 120      * but it actually creates late pictures and freezes --stef */
 121 //    vlc_mutex_unlock( &p_input->stream.stream_lock );
 122     vlc_thread_join( p_es->p_decoder_fifo );
 123 //    vlc_mutex_lock( &p_input->stream.stream_lock );
 124
 125     /* Delete decoder configuration */
 126     DeleteDecoderFifo( p_es->p_decoder_fifo );
 127
 128     /* Unneed module */
 129     module_Unneed( p_es->p_module );
 130
 131     /* Tell the input there is no more decoder */
 132     p_es->p_decoder_fifo = NULL;
 133
 134     p_input->stream.b_changed = 1;
 135 }
 136
 137 /*****************************************************************************
 138  * input_DecodePES
 139  *****************************************************************************
 140  * Put a PES in the decoder's fifo.
 141  *****************************************************************************/
 142 void input_DecodePES( decoder_fifo_t * p_decoder_fifo, pes_packet_t * p_pes )
 143 {
 144     vlc_mutex_lock( &p_decoder_fifo->data_lock );
 145
 146     p_pes->p_next = NULL;
 147     *p_decoder_fifo->pp_last = p_pes;
 148     p_decoder_fifo->pp_last = &p_pes->p_next;
 149     p_decoder_fifo->i_depth++;
 150
 151     /* Warn the decoder that it's got work to do. */
 152     vlc_cond_signal( &p_decoder_fifo->data_wait );
 153     vlc_mutex_unlock( &p_decoder_fifo->data_lock );
 154 }
 155
 156 /*****************************************************************************
 157  * input_EscapeDiscontinuity: send a NULL packet to the decoders
 158  *****************************************************************************/
 159 void input_EscapeDiscontinuity( input_thread_t * p_input )
 160 {
 161     int     i_es, i;
 162
 163     for( i_es = 0; i_es < p_input->stream.i_selected_es_number; i_es++ )
 164     {
 165         es_descriptor_t * p_es = p_input->stream.pp_selected_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_es, i;
 183
 184     for( i_es = 0; i_es < p_input->stream.i_selected_es_number; i_es++ )
 185     {
 186         es_descriptor_t * p_es = p_input->stream.pp_selected_es[i_es];
 187
 188         if( p_es->p_decoder_fifo != NULL && p_es->b_audio )
 189         {
 190             for( i = 0; i < PADDING_PACKET_NUMBER; i++ )
 191             {
 192                 input_NullPacket( p_input, p_es );
 193             }
 194         }
 195     }
 196 }
 197
 198 /*****************************************************************************
 199  * CreateDecoderFifo: create a decoder_fifo_t
 200  *****************************************************************************/
 201 static decoder_fifo_t * CreateDecoderFifo( input_thread_t * p_input,
 202                                            es_descriptor_t * p_es )
 203 {
 204     decoder_fifo_t * p_fifo;
 205
 206     /* Decoder FIFO */
 207     p_fifo = vlc_object_create( p_input, VLC_OBJECT_DECODER );
 208     if( p_fifo == NULL )
 209     {
 210         msg_Err( p_input, "out of memory" );
 211         return NULL;
 212     }
 213
 214     /* Select a new ES */
 215     p_input->stream.i_selected_es_number++;
 216     p_input->stream.pp_selected_es = realloc(
 217                                           p_input->stream.pp_selected_es,
 218                                           p_input->stream.i_selected_es_number
 219                                            * sizeof(es_descriptor_t *) );
 220     if( p_input->stream.pp_selected_es == NULL )
 221     {
 222         msg_Err( p_input, "out of memory" );
 223         vlc_object_destroy( p_fifo );
 224         return NULL;
 225     }
 226
 227     p_input->stream.pp_selected_es[p_input->stream.i_selected_es_number - 1]
 228             = p_es;
 229
 230     /* Initialize the p_fifo structure */
 231     vlc_mutex_init( p_input, &p_fifo->data_lock );
 232     vlc_cond_init( &p_fifo->data_wait );
 233     p_es->p_decoder_fifo = p_fifo;
 234
 235     p_fifo->i_id = p_es->i_id;
 236     p_fifo->i_type = p_es->i_type;
 237     p_fifo->p_demux_data = p_es->p_demux_data;
 238
 239     p_fifo->p_stream_ctrl = &p_input->stream.control;
 240
 241     p_fifo->p_first = NULL;
 242     p_fifo->pp_last = &p_fifo->p_first;
 243     p_fifo->i_depth = 0;
 244     p_fifo->b_die = p_fifo->b_error = 0;
 245     p_fifo->p_packets_mgt = p_input->p_method_data;
 246
 247     vlc_object_attach( p_fifo, p_input );
 248
 249     return p_fifo;
 250 }
 251
 252 /*****************************************************************************
 253  * DeleteDecoderFifo: destroy a decoder_fifo_t
 254  *****************************************************************************/
 255 static void DeleteDecoderFifo( decoder_fifo_t * p_fifo )
 256 {
 257     vlc_object_unlink_all( p_fifo );
 258
 259     msg_Dbg( p_fifo, "killing decoder for 0x%x, type 0x%x, %d PES in FIFO",
 260                      p_fifo->i_id, p_fifo->i_type, p_fifo->i_depth );
 261
 262     /* Free all packets still in the decoder fifo. */
 263     input_DeletePES( p_fifo->p_packets_mgt,
 264                      p_fifo->p_first );
 265
 266     /* Destroy the lock and cond */
 267     vlc_cond_destroy( &p_fifo->data_wait );
 268     vlc_mutex_destroy( &p_fifo->data_lock );
 269
 270     vlc_object_destroy( p_fifo );
 271 }
 272