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 1.46 2002/08/29 23:53:22 massiot 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     decoder_fifo_t *p_fifo;
  49     int i_priority;
  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     p_fifo->p_module = module_Need( p_fifo, "decoder", "$codec" );
  62     if( p_fifo->p_module == NULL )
  63     {
  64         msg_Err( p_fifo, "no suitable decoder module for fourcc `%4.4s'",
  65                        (char*)&p_fifo->i_fourcc );
  66         DeleteDecoderFifo( p_fifo );
  67         vlc_object_destroy( p_fifo );
  68         return NULL;
  69     }
  70
  71     if ( p_es->i_cat == AUDIO_ES )
  72     {
  73         i_priority = VLC_THREAD_PRIORITY_AUDIO;
  74     }
  75     else
  76     {
  77         i_priority = VLC_THREAD_PRIORITY_LOW;
  78     }
  79
  80     /* Spawn the decoder thread */
  81     if( vlc_thread_create( p_fifo, "decoder", p_fifo->pf_run,
  82                            i_priority, VLC_FALSE ) )
  83     {
  84         msg_Err( p_fifo, "cannot spawn decoder thread \"%s\"",
  85                          p_fifo->p_module->psz_object_name );
  86         module_Unneed( p_fifo, p_fifo->p_module );
  87         return NULL;
  88     }
  89
  90     p_input->stream.b_changed = 1;
  91
  92     return p_fifo;
  93 }
  94
  95
  96 /*****************************************************************************
  97  * input_EndDecoder: kills a decoder thread and waits until it's finished
  98  *****************************************************************************/
  99 void input_EndDecoder( input_thread_t * p_input, es_descriptor_t * p_es )
 100 {
 101     int i_dummy;
 102
 103     p_es->p_decoder_fifo->b_die = 1;
 104
 105     /* Make sure the thread leaves the NextDataPacket() function by
 106      * sending it a few null packets. */
 107     for( i_dummy = 0; i_dummy < PADDING_PACKET_NUMBER; i_dummy++ )
 108     {
 109         input_NullPacket( p_input, p_es );
 110     }
 111
 112     if( p_es->p_pes != NULL )
 113     {
 114         input_DecodePES( p_es->p_decoder_fifo, p_es->p_pes );
 115     }
 116
 117     /* Waiting for the thread to exit */
 118     /* I thought that unlocking was better since thread join can be long
 119      * but it actually creates late pictures and freezes --stef */
 120     /* vlc_mutex_unlock( &p_input->stream.stream_lock ); */
 121     vlc_thread_join( p_es->p_decoder_fifo );
 122     /* vlc_mutex_lock( &p_input->stream.stream_lock ); */
 123
 124     /* Delete decoder configuration */
 125     DeleteDecoderFifo( p_es->p_decoder_fifo );
 126
 127     /* Unneed module */
 128     module_Unneed( p_es->p_decoder_fifo, p_es->p_decoder_fifo->p_module );
 129
 130     /* Delete the fifo */
 131     vlc_object_destroy( p_es->p_decoder_fifo );
 132
 133     /* Tell the input there is no more decoder */
 134     p_es->p_decoder_fifo = NULL;
 135
 136     p_input->stream.b_changed = 1;
 137 }
 138
 139 /*****************************************************************************
 140  * input_DecodePES
 141  *****************************************************************************
 142  * Put a PES in the decoder's fifo.
 143  *****************************************************************************/
 144 void input_DecodePES( decoder_fifo_t * p_decoder_fifo, pes_packet_t * p_pes )
 145 {
 146     vlc_mutex_lock( &p_decoder_fifo->data_lock );
 147
 148     p_pes->p_next = NULL;
 149     *p_decoder_fifo->pp_last = p_pes;
 150     p_decoder_fifo->pp_last = &p_pes->p_next;
 151     p_decoder_fifo->i_depth++;
 152
 153     /* Warn the decoder that it's got work to do. */
 154     vlc_cond_signal( &p_decoder_fifo->data_wait );
 155     vlc_mutex_unlock( &p_decoder_fifo->data_lock );
 156 }
 157
 158 /*****************************************************************************
 159  * input_EscapeDiscontinuity: send a NULL packet to the decoders
 160  *****************************************************************************/
 161 void input_EscapeDiscontinuity( input_thread_t * p_input )
 162 {
 163     int     i_es, i;
 164
 165     for( i_es = 0; i_es < p_input->stream.i_selected_es_number; i_es++ )
 166     {
 167         es_descriptor_t * p_es = p_input->stream.pp_selected_es[i_es];
 168
 169         if( p_es->p_decoder_fifo != NULL )
 170         {
 171             for( i = 0; i < PADDING_PACKET_NUMBER; i++ )
 172             {
 173                 input_NullPacket( p_input, p_es );
 174             }
 175         }
 176     }
 177 }
 178
 179 /*****************************************************************************
 180  * input_EscapeAudioDiscontinuity: send a NULL packet to the audio decoders
 181  *****************************************************************************/
 182 void input_EscapeAudioDiscontinuity( input_thread_t * p_input )
 183 {
 184     int     i_es, i;
 185
 186     for( i_es = 0; i_es < p_input->stream.i_selected_es_number; i_es++ )
 187     {
 188         es_descriptor_t * p_es = p_input->stream.pp_selected_es[i_es];
 189
 190         if( p_es->p_decoder_fifo != NULL && p_es->i_cat == AUDIO_ES )
 191         {
 192             for( i = 0; i < PADDING_PACKET_NUMBER; i++ )
 193             {
 194                 input_NullPacket( p_input, p_es );
 195             }
 196         }
 197     }
 198 }
 199
 200 /*****************************************************************************
 201  * CreateDecoderFifo: create a decoder_fifo_t
 202  *****************************************************************************/
 203 static decoder_fifo_t * CreateDecoderFifo( input_thread_t * p_input,
 204                                            es_descriptor_t * p_es )
 205 {
 206     decoder_fifo_t * p_fifo;
 207
 208     /* Decoder FIFO */
 209     p_fifo = vlc_object_create( p_input, VLC_OBJECT_DECODER );
 210     if( p_fifo == NULL )
 211     {
 212         msg_Err( p_input, "out of memory" );
 213         return NULL;
 214     }
 215
 216     /* Select a new ES */
 217     p_input->stream.i_selected_es_number++;
 218     p_input->stream.pp_selected_es = realloc(
 219                                           p_input->stream.pp_selected_es,
 220                                           p_input->stream.i_selected_es_number
 221                                            * sizeof(es_descriptor_t *) );
 222     if( p_input->stream.pp_selected_es == NULL )
 223     {
 224         msg_Err( p_input, "out of memory" );
 225         vlc_object_destroy( p_fifo );
 226         return NULL;
 227     }
 228
 229     p_input->stream.pp_selected_es[p_input->stream.i_selected_es_number - 1]
 230             = p_es;
 231
 232     /* Initialize the p_fifo structure */
 233     vlc_mutex_init( p_input, &p_fifo->data_lock );
 234     vlc_cond_init( p_input, &p_fifo->data_wait );
 235     p_es->p_decoder_fifo = p_fifo;
 236
 237     p_fifo->i_id = p_es->i_id;
 238     p_fifo->i_fourcc = p_es->i_fourcc;
 239     p_fifo->p_demux_data = p_es->p_demux_data;
 240
 241     p_fifo->p_stream_ctrl = &p_input->stream.control;
 242     p_fifo->p_sout = p_input->stream.p_sout;
 243
 244     p_fifo->p_first = NULL;
 245     p_fifo->pp_last = &p_fifo->p_first;
 246     p_fifo->i_depth = 0;
 247     p_fifo->b_die = p_fifo->b_error = 0;
 248     p_fifo->p_packets_mgt = p_input->p_method_data;
 249
 250     vlc_object_attach( p_fifo, p_input );
 251
 252     return p_fifo;
 253 }
 254
 255 /*****************************************************************************
 256  * DeleteDecoderFifo: destroy a decoder_fifo_t
 257  *****************************************************************************/
 258 static void DeleteDecoderFifo( decoder_fifo_t * p_fifo )
 259 {
 260     vlc_object_detach( p_fifo );
 261
 262     msg_Dbg( p_fifo, "killing decoder for 0x%x, fourcc `%4.4s', %d PES in FIFO",
 263                      p_fifo->i_id, (char*)&p_fifo->i_fourcc, p_fifo->i_depth );
 264
 265     /* Free all packets still in the decoder fifo. */
 266     input_DeletePES( p_fifo->p_packets_mgt,
 267                      p_fifo->p_first );
 268
 269     /* Destroy the lock and cond */
 270     vlc_cond_destroy( &p_fifo->data_wait );
 271     vlc_mutex_destroy( &p_fifo->data_lock );
 272 }
 273