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 1.59 2003/03/04 13:21:19 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
  30 #include <vlc/vlc.h>
  31
  32 #include "stream_control.h"
  33 #include "input_ext-dec.h"
  34 #include "input_ext-intf.h"
  35 #include "input_ext-plugins.h"
  36
  37 static decoder_fifo_t * CreateDecoderFifo( input_thread_t *,
  38                                            es_descriptor_t * );
  39 static void             DeleteDecoderFifo( decoder_fifo_t * );
  40
  41 /*****************************************************************************
  42  * input_RunDecoder: spawns a new decoder thread
  43  *****************************************************************************/
  44 decoder_fifo_t * input_RunDecoder( input_thread_t * p_input,
  45                                    es_descriptor_t * p_es )
  46 {
  47     char           *psz_sout;
  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     p_fifo->p_module = NULL;
  61     /* If we are in sout mode, search first for packetizer module then
  62      * codec to do transcoding */
  63     psz_sout = config_GetPsz( p_input, "sout" );
  64     if( psz_sout != NULL && *psz_sout != 0 )
  65     {
  66         vlc_bool_t b_sout = VLC_TRUE;
  67
  68         if( p_es->i_cat == AUDIO_ES )
  69         {
  70             b_sout = config_GetInt( p_input, "sout-audio" );
  71         }
  72         else if( p_es->i_cat == VIDEO_ES )
  73         {
  74             b_sout = config_GetInt( p_input, "sout-video" );
  75         }
  76
  77         if( b_sout )
  78         {
  79             vlc_bool_t b_reencode = VLC_FALSE;
  80
  81             if( p_es->i_cat == AUDIO_ES )
  82             {
  83                 char *psz_sout_acodec = config_GetPsz( p_input, "sout-acodec" );
  84                 if( psz_sout_acodec != NULL && *psz_sout_acodec != '\0' )
  85                 {
  86                     msg_Dbg( p_input, "audio reencoding requested -> unsupported" );
  87                     b_reencode = VLC_TRUE;
  88                 }
  89             }
  90             else if( p_es->i_cat == VIDEO_ES )
  91             {
  92                 char *psz_sout_vcodec = config_GetPsz( p_input, "sout-vcodec" );
  93                 if( psz_sout_vcodec != NULL && *psz_sout_vcodec != '\0' )
  94                 {
  95                     msg_Dbg( p_input, "video reencoding requested" );
  96                     /* force encoder video output */
  97                     config_PutPsz( p_input, "vout", "encoder" );
  98                     b_reencode = VLC_TRUE;
  99                 }
 100             }
 101
 102             if( !b_reencode )
 103             {
 104                 /* we don't want to reencode so search for a packetizer */
 105                 p_fifo->p_module =
 106                     module_Need( p_fifo, "packetizer", "$packetizer" );
 107             }
 108             else
 109             {
 110                 /* get a suitable decoder module to do reencoding*/
 111                 p_fifo->p_module = module_Need( p_fifo, "decoder", "$codec" );
 112             }
 113         }
 114     }
 115     else
 116     {
 117         /* default Get a suitable decoder module */
 118         p_fifo->p_module = module_Need( p_fifo, "decoder", "$codec" );
 119     }
 120
 121     if( p_fifo->p_module == NULL )
 122     {
 123         msg_Err( p_fifo, "no suitable decoder module for fourcc `%4.4s'.\nVLC probably does not support this sound or video format.",
 124                        (char*)&p_fifo->i_fourcc );
 125         DeleteDecoderFifo( p_fifo );
 126         vlc_object_destroy( p_fifo );
 127         return NULL;
 128     }
 129
 130     if ( p_es->i_cat == AUDIO_ES )
 131     {
 132         i_priority = VLC_THREAD_PRIORITY_AUDIO;
 133     }
 134     else
 135     {
 136         i_priority = VLC_THREAD_PRIORITY_VIDEO;
 137     }
 138
 139     /* Spawn the decoder thread */
 140     if( vlc_thread_create( p_fifo, "decoder", p_fifo->pf_run,
 141                            i_priority, VLC_FALSE ) )
 142     {
 143         msg_Err( p_fifo, "cannot spawn decoder thread \"%s\"",
 144                          p_fifo->p_module->psz_object_name );
 145         module_Unneed( p_fifo, p_fifo->p_module );
 146         return NULL;
 147     }
 148
 149     p_input->stream.b_changed = 1;
 150
 151     return p_fifo;
 152 }
 153
 154
 155 /*****************************************************************************
 156  * input_EndDecoder: kills a decoder thread and waits until it's finished
 157  *****************************************************************************/
 158 void input_EndDecoder( input_thread_t * p_input, es_descriptor_t * p_es )
 159 {
 160     int i_dummy;
 161
 162     p_es->p_decoder_fifo->b_die = 1;
 163
 164     /* Make sure the thread leaves the NextDataPacket() function by
 165      * sending it a few null packets. */
 166     for( i_dummy = 0; i_dummy < PADDING_PACKET_NUMBER; i_dummy++ )
 167     {
 168         input_NullPacket( p_input, p_es );
 169     }
 170
 171     if( p_es->p_pes != NULL )
 172     {
 173         input_DecodePES( p_es->p_decoder_fifo, p_es->p_pes );
 174     }
 175
 176     /* Waiting for the thread to exit */
 177     /* I thought that unlocking was better since thread join can be long
 178      * but it actually creates late pictures and freezes --stef */
 179     /* vlc_mutex_unlock( &p_input->stream.stream_lock ); */
 180     vlc_thread_join( p_es->p_decoder_fifo );
 181     /* vlc_mutex_lock( &p_input->stream.stream_lock ); */
 182
 183     /* Delete decoder configuration */
 184     DeleteDecoderFifo( p_es->p_decoder_fifo );
 185
 186     /* Unneed module */
 187     module_Unneed( p_es->p_decoder_fifo, p_es->p_decoder_fifo->p_module );
 188
 189     /* Delete the fifo */
 190     vlc_object_destroy( p_es->p_decoder_fifo );
 191
 192     /* Tell the input there is no more decoder */
 193     p_es->p_decoder_fifo = NULL;
 194
 195     p_input->stream.b_changed = 1;
 196 }
 197
 198 /*****************************************************************************
 199  * input_DecodePES
 200  *****************************************************************************
 201  * Put a PES in the decoder's fifo.
 202  *****************************************************************************/
 203 void input_DecodePES( decoder_fifo_t * p_decoder_fifo, pes_packet_t * p_pes )
 204 {
 205     vlc_mutex_lock( &p_decoder_fifo->data_lock );
 206
 207     p_pes->p_next = NULL;
 208     *p_decoder_fifo->pp_last = p_pes;
 209     p_decoder_fifo->pp_last = &p_pes->p_next;
 210     p_decoder_fifo->i_depth++;
 211
 212     /* Warn the decoder that it's got work to do. */
 213     vlc_cond_signal( &p_decoder_fifo->data_wait );
 214     vlc_mutex_unlock( &p_decoder_fifo->data_lock );
 215 }
 216
 217 /*****************************************************************************
 218  * Create a NULL packet for padding in case of a data loss
 219  *****************************************************************************/
 220 void input_NullPacket( input_thread_t * p_input,
 221                        es_descriptor_t * p_es )
 222 {
 223     data_packet_t *             p_pad_data;
 224     pes_packet_t *              p_pes;
 225
 226     if( (p_pad_data = input_NewPacketForce( p_input->p_method_data,
 227                     PADDING_PACKET_SIZE)) == NULL )
 228     {
 229         msg_Err( p_input, "no new packet" );
 230         p_input->b_error = 1;
 231         return;
 232     }
 233
 234     memset( p_pad_data->p_payload_start, 0, PADDING_PACKET_SIZE );
 235     p_pad_data->b_discard_payload = 1;
 236     p_pes = p_es->p_pes;
 237
 238     if( p_pes != NULL )
 239     {
 240         p_pes->b_discontinuity = 1;
 241         p_pes->p_last->p_next = p_pad_data;
 242         p_pes->p_last = p_pad_data;
 243         p_pes->i_nb_data++;
 244     }
 245     else
 246     {
 247         if( (p_pes = input_NewPES( p_input->p_method_data )) == NULL )
 248         {
 249             msg_Err( p_input, "no PES packet" );
 250             p_input->b_error = 1;
 251             return;
 252         }
 253
 254         p_pes->i_rate = p_input->stream.control.i_rate;
 255         p_pes->p_first = p_pes->p_last = p_pad_data;
 256         p_pes->i_nb_data = 1;
 257         p_pes->b_discontinuity = 1;
 258         input_DecodePES( p_es->p_decoder_fifo, p_pes );
 259     }
 260 }
 261
 262 /*****************************************************************************
 263  * input_EscapeDiscontinuity: send a NULL packet to the decoders
 264  *****************************************************************************/
 265 void input_EscapeDiscontinuity( input_thread_t * p_input )
 266 {
 267     unsigned int i_es, i;
 268
 269     for( i_es = 0; i_es < p_input->stream.i_selected_es_number; i_es++ )
 270     {
 271         es_descriptor_t * p_es = p_input->stream.pp_selected_es[i_es];
 272
 273         if( p_es->p_decoder_fifo != NULL )
 274         {
 275             for( i = 0; i < PADDING_PACKET_NUMBER; i++ )
 276             {
 277                 input_NullPacket( p_input, p_es );
 278             }
 279         }
 280     }
 281 }
 282
 283 /*****************************************************************************
 284  * input_EscapeAudioDiscontinuity: send a NULL packet to the audio decoders
 285  *****************************************************************************/
 286 void input_EscapeAudioDiscontinuity( input_thread_t * p_input )
 287 {
 288     unsigned int i_es, i;
 289
 290     for( i_es = 0; i_es < p_input->stream.i_selected_es_number; i_es++ )
 291     {
 292         es_descriptor_t * p_es = p_input->stream.pp_selected_es[i_es];
 293
 294         if( p_es->p_decoder_fifo != NULL && p_es->i_cat == AUDIO_ES )
 295         {
 296             for( i = 0; i < PADDING_PACKET_NUMBER; i++ )
 297             {
 298                 input_NullPacket( p_input, p_es );
 299             }
 300         }
 301     }
 302 }
 303
 304 /*****************************************************************************
 305  * CreateDecoderFifo: create a decoder_fifo_t
 306  *****************************************************************************/
 307 static decoder_fifo_t * CreateDecoderFifo( input_thread_t * p_input,
 308                                            es_descriptor_t * p_es )
 309 {
 310     decoder_fifo_t * p_fifo;
 311
 312     /* Decoder FIFO */
 313     p_fifo = vlc_object_create( p_input, VLC_OBJECT_DECODER );
 314     if( p_fifo == NULL )
 315     {
 316         msg_Err( p_input, "out of memory" );
 317         return NULL;
 318     }
 319
 320     /* Select a new ES */
 321     INSERT_ELEM( p_input->stream.pp_selected_es,
 322                  p_input->stream.i_selected_es_number,
 323                  p_input->stream.i_selected_es_number,
 324                  p_es );
 325
 326     /* Initialize the p_fifo structure */
 327     vlc_mutex_init( p_input, &p_fifo->data_lock );
 328     vlc_cond_init( p_input, &p_fifo->data_wait );
 329     p_es->p_decoder_fifo = p_fifo;
 330
 331     p_fifo->i_id = p_es->i_id;
 332     p_fifo->i_fourcc = p_es->i_fourcc;
 333     p_fifo->p_demux_data   = p_es->p_demux_data;
 334     p_fifo->p_waveformatex = p_es->p_waveformatex;
 335     p_fifo->p_bitmapinfoheader = p_es->p_bitmapinfoheader;
 336     p_fifo->p_stream_ctrl = &p_input->stream.control;
 337     p_fifo->p_sout = p_input->stream.p_sout;
 338
 339     p_fifo->p_first = NULL;
 340     p_fifo->pp_last = &p_fifo->p_first;
 341     p_fifo->i_depth = 0;
 342     p_fifo->b_die = p_fifo->b_error = 0;
 343     p_fifo->p_packets_mgt = p_input->p_method_data;
 344
 345     vlc_object_attach( p_fifo, p_input );
 346
 347     return p_fifo;
 348 }
 349
 350 /*****************************************************************************
 351  * DeleteDecoderFifo: destroy a decoder_fifo_t
 352  *****************************************************************************/
 353 static void DeleteDecoderFifo( decoder_fifo_t * p_fifo )
 354 {
 355     vlc_object_detach( p_fifo );
 356
 357     msg_Dbg( p_fifo, "killing decoder for 0x%x, fourcc `%4.4s', %d PES in FIFO",
 358                      p_fifo->i_id, (char*)&p_fifo->i_fourcc, p_fifo->i_depth );
 359
 360     /* Free all packets still in the decoder fifo. */
 361     input_DeletePES( p_fifo->p_packets_mgt,
 362                      p_fifo->p_first );
 363
 364     /* Destroy the lock and cond */
 365     vlc_cond_destroy( &p_fifo->data_wait );
 366     vlc_mutex_destroy( &p_fifo->data_lock );
 367 }
 368