modules/stream_out/switcher.c

   1 /*****************************************************************************
   2  * switcher.c: MPEG2 video switcher module
   3  *****************************************************************************
   4  * Copyright (C) 2004 the VideoLAN team
   5  * $Id$
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <math.h>
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_sout.h>
  36 #include <vlc_vout.h>
  37
  38 #include <vlc_charset.h>
  39 #include <vlc_network.h>
  40
  41 #define HAVE_MMX
  42 #ifdef HAVE_LIBAVCODEC_AVCODEC_H
  43 #   include <libavcodec/avcodec.h>
  44 #elif defined(HAVE_FFMPEG_AVCODEC_H)
  45 #   include <ffmpeg/avcodec.h>
  46 #else
  47 #   include <avcodec.h>
  48 #endif
  49
  50 #ifdef HAVE_POSTPROC_POSTPROCESS_H
  51 #   include <postproc/postprocess.h>
  52 #else
  53 #   include <libpostproc/postprocess.h>
  54 #endif
  55
  56 #define SOUT_CFG_PREFIX "sout-switcher-"
  57 #define MAX_PICTURES 10
  58 #define MAX_AUDIO 30
  59 #define MAX_THRESHOLD 99999999
  60
  61 /*****************************************************************************
  62  * Local prototypes
  63  *****************************************************************************/
  64 static int      Open    ( vlc_object_t * );
  65 static void     Close   ( vlc_object_t * );
  66
  67 static sout_stream_id_t *Add( sout_stream_t *, es_format_t * );
  68 static int Del( sout_stream_t *, sout_stream_id_t * );
  69 static int Send( sout_stream_t *, sout_stream_id_t *, block_t * );
  70
  71 static mtime_t Process( sout_stream_t *p_stream, sout_stream_id_t *id,
  72                         mtime_t i_max_dts );
  73 static int UnpackFromFile( sout_stream_t *p_stream, const char *psz_file,
  74                            int i_width, int i_height,
  75                            picture_t *p_pic );
  76 static void NetCommand( sout_stream_t *p_stream );
  77 static mtime_t VideoCommand( sout_stream_t *p_stream, sout_stream_id_t *id );
  78 static block_t *VideoGetBuffer( sout_stream_t *p_stream, sout_stream_id_t *id,
  79                                 block_t *p_buffer );
  80 static block_t *AudioGetBuffer( sout_stream_t *p_stream, sout_stream_id_t *id,
  81                                 block_t *p_buffer );
  82
  83 /*****************************************************************************
  84  * Module descriptor
  85  *****************************************************************************/
  86 #define FILES_TEXT N_("Files")
  87 #define FILES_LONGTEXT N_( \
  88     "Full paths of the files separated by colons." )
  89 #define SIZES_TEXT N_("Sizes")
  90 #define SIZES_LONGTEXT N_( \
  91     "List of sizes separated by colons (720x576:480x576)." )
  92 #define RATIO_TEXT N_("Aspect ratio")
  93 #define RATIO_LONGTEXT N_( \
  94     "Aspect ratio (4:3, 16:9)." )
  95 #define PORT_TEXT N_("Command UDP port")
  96 #define PORT_LONGTEXT N_( \
  97     "UDP port to listen to for commands." )
  98 #define COMMAND_TEXT N_("Command")
  99 #define COMMAND_LONGTEXT N_( \
 100     "Initial command to execute." )
 101 #define GOP_TEXT N_("GOP size")
 102 #define GOP_LONGTEXT N_( \
 103     "Number of P frames between two I frames." )
 104 #define QSCALE_TEXT N_("Quantizer scale")
 105 #define QSCALE_LONGTEXT N_( \
 106     "Fixed quantizer scale to use." )
 107 #define AUDIO_TEXT N_("Mute audio")
 108 #define AUDIO_LONGTEXT N_( \
 109     "Mute audio when command is not 0." )
 110
 111 vlc_module_begin ()
 112     set_description( N_("MPEG2 video switcher stream output") )
 113     set_capability( "sout stream", 50 )
 114     add_shortcut( "switcher" )
 115     set_callbacks( Open, Close )
 116
 117     add_string( SOUT_CFG_PREFIX "files", "", NULL, FILES_TEXT,
 118                 FILES_LONGTEXT, false );
 119     add_string( SOUT_CFG_PREFIX "sizes", "", NULL, SIZES_TEXT,
 120                 SIZES_LONGTEXT, false );
 121     add_string( SOUT_CFG_PREFIX "aspect-ratio", "4:3", NULL, RATIO_TEXT,
 122                 RATIO_LONGTEXT, false );
 123     add_integer( SOUT_CFG_PREFIX "port", 5001, NULL,
 124                  PORT_TEXT, PORT_LONGTEXT, true );
 125     add_integer( SOUT_CFG_PREFIX "command", 0, NULL,
 126                  COMMAND_TEXT, COMMAND_LONGTEXT, true );
 127     add_integer( SOUT_CFG_PREFIX "gop", 8, NULL,
 128                  GOP_TEXT, GOP_LONGTEXT, true );
 129     add_integer( SOUT_CFG_PREFIX "qscale", 5, NULL,
 130                  QSCALE_TEXT, QSCALE_LONGTEXT, true );
 131     add_bool( SOUT_CFG_PREFIX "mute-audio", 1, NULL,
 132               AUDIO_TEXT, AUDIO_LONGTEXT, true );
 133 vlc_module_end ()
 134
 135 static const char *const ppsz_sout_options[] = {
 136     "files", "sizes", "aspect-ratio", "port", "command", "gop", "qscale",
 137     "mute-audio", NULL
 138 };
 139
 140 struct sout_stream_sys_t
 141 {
 142     sout_stream_t   *p_out;
 143     int             i_gop;
 144     int             i_qscale;
 145     int             i_aspect;
 146     sout_stream_id_t *pp_audio_ids[MAX_AUDIO];
 147     bool      b_audio;
 148
 149     /* Pictures */
 150     picture_t       p_pictures[MAX_PICTURES];
 151     int             i_nb_pictures;
 152
 153     /* Command */
 154     int             i_fd;
 155     int             i_cmd, i_old_cmd;
 156 };
 157
 158 struct sout_stream_id_t
 159 {
 160     void            *id;
 161     bool      b_switcher_video;
 162     bool      b_switcher_audio;
 163     es_format_t     f_src;
 164     block_t         *p_queued;
 165
 166     /* ffmpeg part */
 167     AVCodec         *ff_enc;
 168     AVCodecContext  *ff_enc_c;
 169     AVFrame         *p_frame;
 170     uint8_t         *p_buffer_out;
 171     int             i_nb_pred;
 172     int16_t         *p_samples;
 173 };
 174
 175 /*****************************************************************************
 176  * Open:
 177  *****************************************************************************/
 178 static int Open( vlc_object_t *p_this )
 179 {
 180     sout_stream_t     *p_stream = (sout_stream_t*)p_this;
 181     sout_stream_sys_t *p_sys;
 182     vlc_value_t       val;
 183     char              *psz_files, *psz_sizes;
 184     int               i_height = 0, i_width = 0;
 185
 186     p_sys = malloc( sizeof(sout_stream_sys_t) );
 187     memset( p_sys, 0, sizeof(sout_stream_sys_t) );
 188
 189     p_sys->p_out = sout_StreamNew( p_stream->p_sout, p_stream->psz_next );
 190     if( !p_sys->p_out )
 191     {
 192         msg_Err( p_stream, "cannot create chain" );
 193         free( p_sys );
 194         return VLC_EGENERIC;
 195     }
 196
 197     config_ChainParse( p_stream, SOUT_CFG_PREFIX, ppsz_sout_options,
 198                    p_stream->p_cfg );
 199
 200     var_Get( p_stream, SOUT_CFG_PREFIX "files", &val );
 201     psz_files = val.psz_string;
 202     var_Get( p_stream, SOUT_CFG_PREFIX "sizes", &val );
 203     psz_sizes = val.psz_string;
 204
 205     p_sys->i_nb_pictures = 0;
 206     while ( psz_files && *psz_files )
 207     {
 208         char * psz_file = psz_files;
 209         char * psz_size = psz_sizes;
 210
 211         while ( *psz_files && *psz_files != ':' )
 212             psz_files++;
 213         if ( *psz_files == ':' )
 214            *psz_files++ = '\0';
 215
 216         if ( *psz_sizes )
 217         {
 218             while ( *psz_sizes && *psz_sizes != ':' )
 219                 psz_sizes++;
 220             if ( *psz_sizes == ':' )
 221                 *psz_sizes++ = '\0';
 222             if ( sscanf( psz_size, "%dx%d", &i_width, &i_height ) != 2 )
 223             {
 224                 msg_Err( p_stream, "bad size %s for file %s", psz_size,
 225                          psz_file );
 226                 free( p_sys );
 227                 return VLC_EGENERIC;
 228             }
 229         }
 230
 231         if ( UnpackFromFile( p_stream, psz_file, i_width, i_height,
 232                              &p_sys->p_pictures[p_sys->i_nb_pictures] ) < 0 )
 233         {
 234             free( p_sys );
 235             return VLC_EGENERIC;
 236         }
 237         p_sys->i_nb_pictures++;
 238     }
 239
 240     var_Get( p_stream, SOUT_CFG_PREFIX "aspect-ratio", &val );
 241     if ( val.psz_string )
 242     {
 243         char *psz_parser = strchr( val.psz_string, ':' );
 244
 245         if( psz_parser )
 246         {
 247             *psz_parser++ = '\0';
 248             p_sys->i_aspect = atoi( val.psz_string ) * VOUT_ASPECT_FACTOR
 249                 / atoi( psz_parser );
 250         }
 251         else
 252         {
 253             msg_Warn( p_stream, "bad aspect ratio %s", val.psz_string );
 254             p_sys->i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
 255         }
 256
 257         free( val.psz_string );
 258     }
 259     else
 260     {
 261         p_sys->i_aspect = 4 * VOUT_ASPECT_FACTOR / 3;
 262     }
 263
 264     var_Get( p_stream, SOUT_CFG_PREFIX "port", &val );
 265     p_sys->i_fd = net_ListenUDP1( p_stream, NULL, val.i_int );
 266     if ( p_sys->i_fd < 0 )
 267     {
 268         free( p_sys );
 269         return VLC_EGENERIC;
 270     }
 271
 272     var_Get( p_stream, SOUT_CFG_PREFIX "command", &val );
 273     p_sys->i_cmd = val.i_int;
 274     p_sys->i_old_cmd = 0;
 275
 276     var_Get( p_stream, SOUT_CFG_PREFIX "gop", &val );
 277     p_sys->i_gop = val.i_int;
 278
 279     var_Get( p_stream, SOUT_CFG_PREFIX "qscale", &val );
 280     p_sys->i_qscale = val.i_int;
 281
 282     var_Get( p_stream, SOUT_CFG_PREFIX "mute-audio", &val );
 283     p_sys->b_audio = val.b_bool;
 284
 285     p_stream->pf_add    = Add;
 286     p_stream->pf_del    = Del;
 287     p_stream->pf_send   = Send;
 288     p_stream->p_sys     = p_sys;
 289
 290     avcodec_init();
 291     avcodec_register_all();
 292
 293     return VLC_SUCCESS;
 294 }
 295
 296 /*****************************************************************************
 297  * Close:
 298  *****************************************************************************/
 299 static void Close( vlc_object_t * p_this )
 300 {
 301     sout_stream_t       *p_stream = (sout_stream_t *)p_this;
 302     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 303
 304     sout_StreamDelete( p_sys->p_out );
 305
 306     free( p_sys );
 307 }
 308
 309 /*****************************************************************************
 310  * Add: Add an input elementary stream
 311  *****************************************************************************/
 312 static sout_stream_id_t *Add( sout_stream_t *p_stream, es_format_t *p_fmt )
 313 {
 314     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 315     sout_stream_id_t    *id;
 316
 317     id = malloc( sizeof( sout_stream_id_t ) );
 318     memset( id, 0, sizeof( sout_stream_id_t ) );
 319     id->id = NULL;
 320
 321     if ( p_fmt->i_cat == VIDEO_ES
 322             && (p_fmt->i_codec == VLC_FOURCC('m', 'p', 'g', 'v')
 323                  || p_fmt->i_codec == VLC_FOURCC('f', 'a', 'k', 'e')) )
 324     {
 325         id->b_switcher_video = true;
 326         p_fmt->i_codec = VLC_FOURCC('m', 'p', 'g', 'v');
 327         msg_Dbg( p_stream,
 328                  "creating video switcher for fcc=`%4.4s' cmd:%d",
 329                  (char*)&p_fmt->i_codec, p_sys->i_cmd );
 330     }
 331     else if ( p_fmt->i_cat == AUDIO_ES
 332                && p_fmt->i_codec == VLC_FOURCC('m', 'p', 'g', 'a')
 333                && p_sys->b_audio )
 334     {
 335         int i_ff_codec = CODEC_ID_MP2;
 336         int i;
 337
 338         id->b_switcher_audio = true;
 339         msg_Dbg( p_stream,
 340                  "creating audio switcher for fcc=`%4.4s' cmd:%d",
 341                  (char*)&p_fmt->i_codec, p_sys->i_cmd );
 342
 343         /* Allocate the encoder right now. */
 344         if( i_ff_codec == 0 )
 345         {
 346             msg_Err( p_stream, "cannot find encoder" );
 347             return NULL;
 348         }
 349
 350         id->ff_enc = avcodec_find_encoder( i_ff_codec );
 351         if( !id->ff_enc )
 352         {
 353             msg_Err( p_stream, "cannot find encoder (avcodec)" );
 354             return NULL;
 355         }
 356
 357         id->ff_enc_c = avcodec_alloc_context();
 358
 359         /* Set CPU capabilities */
 360         unsigned i_cpu = vlc_CPU();
 361         id->ff_enc_c->dsp_mask = 0;
 362         if( !(i_cpu & CPU_CAPABILITY_MMX) )
 363         {
 364             id->ff_enc_c->dsp_mask |= FF_MM_MMX;
 365         }
 366         if( !(i_cpu & CPU_CAPABILITY_MMXEXT) )
 367         {
 368             id->ff_enc_c->dsp_mask |= FF_MM_MMXEXT;
 369         }
 370         if( !(i_cpu & CPU_CAPABILITY_3DNOW) )
 371         {
 372             id->ff_enc_c->dsp_mask |= FF_MM_3DNOW;
 373         }
 374         if( !(i_cpu & CPU_CAPABILITY_SSE) )
 375         {
 376             id->ff_enc_c->dsp_mask |= FF_MM_SSE;
 377             id->ff_enc_c->dsp_mask |= FF_MM_SSE2;
 378         }
 379
 380         id->ff_enc_c->sample_rate = p_fmt->audio.i_rate;
 381         id->ff_enc_c->channels    = p_fmt->audio.i_channels;
 382         id->ff_enc_c->bit_rate    = p_fmt->i_bitrate;
 383
 384         if( avcodec_open( id->ff_enc_c, id->ff_enc ) )
 385         {
 386             msg_Err( p_stream, "cannot open encoder" );
 387             return NULL;
 388         }
 389
 390         id->p_buffer_out = malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * 2 );
 391         id->p_samples = malloc( id->ff_enc_c->frame_size
 392                                  * p_fmt->audio.i_channels * sizeof(int16_t) );
 393         memset( id->p_samples, 0,
 394                 id->ff_enc_c->frame_size * p_fmt->audio.i_channels
 395                  * sizeof(int16_t) );
 396
 397         for ( i = 0; i < MAX_AUDIO; i++ )
 398         {
 399             if ( p_sys->pp_audio_ids[i] == NULL )
 400             {
 401                 p_sys->pp_audio_ids[i] = id;
 402                 break;
 403             }
 404         }
 405         if ( i == MAX_AUDIO )
 406         {
 407             msg_Err( p_stream, "too many audio streams!" );
 408             free( id );
 409             return NULL;
 410         }
 411     }
 412     else
 413     {
 414         msg_Dbg( p_stream, "do not know what to do when switching (fcc=`%4.4s')",
 415                  (char*)&p_fmt->i_codec );
 416     }
 417
 418     /* src format */
 419     memcpy( &id->f_src, p_fmt, sizeof( es_format_t ) );
 420
 421     /* open output stream */
 422     id->id = p_sys->p_out->pf_add( p_sys->p_out, p_fmt );
 423
 424     if ( id->id == NULL )
 425     {
 426         free( id );
 427         return NULL;
 428     }
 429
 430     return id;
 431 }
 432
 433 /*****************************************************************************
 434  * Del: Del an elementary stream
 435  *****************************************************************************/
 436 static int Del( sout_stream_t *p_stream, sout_stream_id_t *id )
 437 {
 438     sout_stream_sys_t   *p_sys = p_stream->p_sys;
 439
 440     if ( id->b_switcher_audio )
 441     {
 442         int i;
 443         for ( i = 0; i < MAX_AUDIO; i++ )
 444         {
 445             if ( p_sys->pp_audio_ids[i] == id )
 446             {
 447                 p_sys->pp_audio_ids[i] = NULL;
 448                 break;
 449             }
 450         }
 451     }
 452
 453     if ( id->ff_enc )
 454     {
 455         avcodec_close( id->ff_enc_c );
 456         av_free( id->ff_enc_c );
 457         av_free( id->p_frame );
 458         free( id->p_buffer_out );
 459     }
 460
 461     if ( id->id )
 462     {
 463         p_sys->p_out->pf_del( p_sys->p_out, id->id );
 464     }
 465     free( id );
 466
 467     return VLC_SUCCESS;
 468 }
 469
 470 /*****************************************************************************
 471  * Send: Process an input packet
 472  *****************************************************************************/
 473 static int Send( sout_stream_t *p_stream, sout_stream_id_t *id,
 474                  block_t *p_buffer )
 475 {
 476     sout_stream_sys_t *p_sys = p_stream->p_sys;
 477
 478     if ( !id->id )
 479     {
 480         block_Release( p_buffer );
 481         return VLC_EGENERIC;
 482     }
 483
 484     if ( !id->b_switcher_video && !id->b_switcher_audio )
 485     {
 486         return p_sys->p_out->pf_send( p_sys->p_out, id->id, p_buffer );
 487     }
 488
 489     block_ChainAppend( &id->p_queued, p_buffer );
 490
 491     if ( id->b_switcher_video )
 492     {
 493         /* Check for commands for every video frame. */
 494         NetCommand( p_stream );
 495
 496         while ( id->p_queued != NULL )
 497         {
 498             mtime_t i_dts = 0;
 499             int i;
 500
 501             if ( p_sys->i_old_cmd != p_sys->i_cmd )
 502             {
 503                 i_dts = VideoCommand( p_stream, id );
 504             }
 505
 506             i_dts = Process( p_stream, id, i_dts );
 507
 508             for ( i = 0; i < MAX_AUDIO; i++ )
 509             {
 510                 if ( p_sys->pp_audio_ids[i] != NULL )
 511                     Process( p_stream, p_sys->pp_audio_ids[i], i_dts );
 512             }
 513         }
 514     }
 515
 516     return VLC_SUCCESS;
 517 }
 518
 519 /*****************************************************************************
 520  * Process: Process and dispatch buffers
 521  *****************************************************************************/
 522 static mtime_t Process( sout_stream_t *p_stream, sout_stream_id_t *id,
 523                         mtime_t i_max_dts )
 524 {
 525     sout_stream_sys_t *p_sys = p_stream->p_sys;
 526     mtime_t i_dts = 0;
 527     block_t *p_blocks = NULL;
 528     block_t *p_blocks_out = NULL;
 529
 530     /* Find out the blocks we need. */
 531     while ( id->p_queued != NULL
 532              && (!i_max_dts || id->p_queued->i_dts <= i_max_dts) )
 533     {
 534         block_t *p_next = id->p_queued->p_next;
 535         id->p_queued->p_next = NULL;
 536         i_dts = id->p_queued->i_dts;
 537         block_ChainAppend( &p_blocks, id->p_queued );
 538         id->p_queued = p_next;
 539     }
 540
 541     if ( p_sys->i_old_cmd == 0 )
 542     {
 543         /* Full forward */
 544         if ( p_blocks != NULL )
 545             p_sys->p_out->pf_send( p_sys->p_out, id->id, p_blocks );
 546         return i_dts;
 547     }
 548
 549     if ( p_sys->i_old_cmd == -1 )
 550     {
 551         /* No output at all */
 552         while ( p_blocks != NULL )
 553         {
 554             block_t * p_next = p_blocks->p_next;
 555             block_Release( p_blocks );
 556             p_blocks = p_next;
 557         }
 558         return i_dts;
 559     }
 560
 561     while ( p_blocks != NULL )
 562     {
 563         block_t * p_next = p_blocks->p_next;
 564         block_t * p_out;
 565
 566         if ( id->b_switcher_video )
 567         {
 568             p_out = VideoGetBuffer( p_stream, id, p_blocks );
 569         }
 570         else
 571         {
 572             p_out = AudioGetBuffer( p_stream, id, p_blocks );
 573         }
 574         p_blocks = p_next;
 575         if ( p_out != NULL )
 576         {
 577             block_ChainAppend( &p_blocks_out, p_out );
 578         }
 579     }
 580
 581     if ( p_blocks_out != NULL )
 582         p_sys->p_out->pf_send( p_sys->p_out, id->id, p_blocks_out );
 583     return i_dts;
 584 }
 585
 586 /*****************************************************************************
 587  * UnpackFromFile: Read a YUV picture and store it in our format
 588  *****************************************************************************/
 589 static int UnpackFromFile( sout_stream_t *p_stream, const char *psz_file,
 590                            int i_width, int i_height,
 591                            picture_t *p_pic )
 592 {
 593     int i, j;
 594     FILE *p_file = utf8_fopen( psz_file, "r" );
 595
 596     if ( p_file == NULL )
 597     {
 598         msg_Err( p_stream, "file %s not found", psz_file );
 599         return -1;
 600     }
 601
 602     vout_InitPicture( VLC_OBJECT(p_stream), p_pic, VLC_FOURCC('I','4','2','0'),
 603                       i_width, i_height,
 604                       i_width * VOUT_ASPECT_FACTOR / i_height );
 605     for ( i = 0; i < p_pic->i_planes; i++ )
 606     {
 607         p_pic->p[i].p_pixels = malloc( p_pic->p[i].i_lines *
 608                                            p_pic->p[i].i_pitch );
 609         memset( p_pic->p[i].p_pixels, 0, p_pic->p[i].i_lines *
 610                     p_pic->p[i].i_pitch );
 611     }
 612
 613     for ( i = 0; i < i_height; i++ )
 614     {
 615         int i_chroma;
 616         uint8_t p_buffer[i_width * 2];
 617         uint8_t *p_char = p_buffer;
 618         uint8_t *p_y = &p_pic->p[0].p_pixels[i * p_pic->p[0].i_pitch];
 619         uint8_t *p_u = &p_pic->p[1].p_pixels[i/2 * p_pic->p[1].i_pitch];
 620         uint8_t *p_v = &p_pic->p[2].p_pixels[i/2 * p_pic->p[2].i_pitch];
 621
 622         if ( fread( p_buffer, 2, i_width, p_file ) != (size_t)i_width )
 623         {
 624             msg_Err( p_stream, "premature end of file %s", psz_file );
 625             fclose( p_file );
 626             for ( i = 0; i < p_pic->i_planes; i++ )
 627             {
 628                 free( p_pic->p[i].p_pixels );
 629             }
 630             return -1;
 631         }
 632
 633         i_chroma = 0;
 634         for ( j = 0; j < i_width; j++ )
 635         {
 636             uint8_t **pp_chroma = i_chroma ? &p_v : &p_u;
 637             i_chroma = !i_chroma;
 638             if ( i & 1 )
 639                 **pp_chroma = (**pp_chroma + *p_char + 1) / 2;
 640             else
 641                 **pp_chroma = *p_char;
 642             (*pp_chroma)++;
 643             p_char++;
 644             *p_y++ = *p_char++;
 645         }
 646     }
 647
 648     fclose( p_file );
 649     return 0;
 650 }
 651
 652 /*****************************************************************************
 653  * NetCommand: Get a command from the network
 654  *****************************************************************************/
 655 static void NetCommand( sout_stream_t *p_stream )
 656 {
 657     sout_stream_sys_t *p_sys = p_stream->p_sys;
 658     char psz_buffer[11];
 659     int i_len = recv( p_sys->i_fd, psz_buffer, sizeof( psz_buffer ) - 1, 0 );
 660
 661     if ( i_len > 0 )
 662     {
 663         psz_buffer[i_len] = '\0';
 664         int i_cmd = strtol( psz_buffer, NULL, 0 );
 665         if ( i_cmd < -1 || i_cmd > p_sys->i_nb_pictures )
 666         {
 667             msg_Err( p_stream, "got a wrong command (%d)", i_cmd );
 668             return;
 669         }
 670
 671         p_sys->i_cmd = i_cmd;
 672
 673         msg_Dbg( p_stream, "new command: %d old:%d", p_sys->i_cmd,
 674                  p_sys->i_old_cmd );
 675     }
 676 }
 677
 678 /*****************************************************************************
 679  * VideoCommand: Create/Delete a video encoder
 680  *****************************************************************************/
 681 static mtime_t VideoCommand( sout_stream_t *p_stream, sout_stream_id_t *id )
 682 {
 683     sout_stream_sys_t *p_sys = p_stream->p_sys;
 684
 685     if ( p_sys->i_cmd == 0 && !(id->p_queued->i_flags & BLOCK_FLAG_TYPE_I) )
 686     {
 687         mtime_t i_dts = id->p_queued->i_dts;
 688         block_t *p_block = id->p_queued->p_next;
 689
 690         while ( p_block != NULL )
 691         {
 692             if ( p_block->i_flags & BLOCK_FLAG_TYPE_I )
 693                 return i_dts;
 694             i_dts = p_block->i_dts;
 695             p_block = p_block->p_next;
 696         }
 697
 698         return 0;
 699     }
 700
 701     p_sys->i_old_cmd = p_sys->i_cmd;
 702
 703     if ( id->ff_enc )
 704     {
 705         avcodec_close( id->ff_enc_c );
 706         av_free( id->ff_enc_c );
 707         av_free( id->p_frame );
 708         free( id->p_buffer_out );
 709         id->ff_enc = NULL;
 710     }
 711
 712     if ( p_sys->i_cmd > 0 )
 713     {
 714         /* Create a new encoder. */
 715         int i_ff_codec = CODEC_ID_MPEG2VIDEO;
 716         int i_aspect_num, i_aspect_den;
 717
 718         if( i_ff_codec == 0 )
 719         {
 720             msg_Err( p_stream, "cannot find encoder" );
 721             return 0;
 722         }
 723
 724         id->ff_enc = avcodec_find_encoder( i_ff_codec );
 725         if( !id->ff_enc )
 726         {
 727             msg_Err( p_stream, "cannot find encoder (avcodec)" );
 728             return 0;
 729         }
 730
 731         id->ff_enc_c = avcodec_alloc_context();
 732
 733         /* Set CPU capabilities */
 734         unsigned i_cpu = vlc_CPU();
 735         id->ff_enc_c->dsp_mask = 0;
 736         if( !(i_cpu & CPU_CAPABILITY_MMX) )
 737         {
 738             id->ff_enc_c->dsp_mask |= FF_MM_MMX;
 739         }
 740         if( !(i_cpu & CPU_CAPABILITY_MMXEXT) )
 741         {
 742             id->ff_enc_c->dsp_mask |= FF_MM_MMXEXT;
 743         }
 744         if( !(i_cpu & CPU_CAPABILITY_3DNOW) )
 745         {
 746             id->ff_enc_c->dsp_mask |= FF_MM_3DNOW;
 747         }
 748         if( !(i_cpu & CPU_CAPABILITY_SSE) )
 749         {
 750             id->ff_enc_c->dsp_mask |= FF_MM_SSE;
 751             id->ff_enc_c->dsp_mask |= FF_MM_SSE2;
 752         }
 753
 754         id->ff_enc_c->width = p_sys->p_pictures[p_sys->i_cmd-1].format.i_width;
 755         id->ff_enc_c->height = p_sys->p_pictures[p_sys->i_cmd-1].format.i_height;
 756         av_reduce( &i_aspect_num, &i_aspect_den,
 757                    p_sys->i_aspect,
 758                    VOUT_ASPECT_FACTOR, 1 << 30 /* something big */ );
 759         av_reduce( &id->ff_enc_c->sample_aspect_ratio.num,
 760                    &id->ff_enc_c->sample_aspect_ratio.den,
 761                    i_aspect_num * (int64_t)id->ff_enc_c->height,
 762                    i_aspect_den * (int64_t)id->ff_enc_c->width, 1 << 30 );
 763
 764 #if LIBAVCODEC_BUILD >= 4754
 765         id->ff_enc_c->time_base.num = 1;
 766         id->ff_enc_c->time_base.den = 25; /* FIXME */
 767 #else
 768         id->ff_enc_c->frame_rate    = 25; /* FIXME */
 769         id->ff_enc_c->frame_rate_base = 1;
 770 #endif
 771
 772         id->ff_enc_c->gop_size = 200;
 773         id->ff_enc_c->max_b_frames = 0;
 774
 775         id->ff_enc_c->flags |= CODEC_FLAG_QSCALE
 776                             | CODEC_FLAG_INPUT_PRESERVED
 777                             | CODEC_FLAG_LOW_DELAY;
 778
 779         id->ff_enc_c->mb_decision = FF_MB_DECISION_SIMPLE;
 780         id->ff_enc_c->pix_fmt = PIX_FMT_YUV420P;
 781
 782         if( avcodec_open( id->ff_enc_c, id->ff_enc ) )
 783         {
 784             msg_Err( p_stream, "cannot open encoder" );
 785             return 0;
 786         }
 787
 788         id->p_buffer_out = malloc( id->ff_enc_c->width * id->ff_enc_c->height * 3 );
 789         id->p_frame = avcodec_alloc_frame();
 790         id->p_frame->linesize[0] = p_sys->p_pictures[p_sys->i_cmd-1].p[0].i_pitch;
 791         id->p_frame->linesize[1] = p_sys->p_pictures[p_sys->i_cmd-1].p[1].i_pitch;
 792         id->p_frame->linesize[2] = p_sys->p_pictures[p_sys->i_cmd-1].p[2].i_pitch;
 793         id->p_frame->data[0] = p_sys->p_pictures[p_sys->i_cmd-1].p[0].p_pixels;
 794         id->p_frame->data[1] = p_sys->p_pictures[p_sys->i_cmd-1].p[1].p_pixels;
 795         id->p_frame->data[2] = p_sys->p_pictures[p_sys->i_cmd-1].p[2].p_pixels;
 796
 797         id->i_nb_pred = p_sys->i_gop;
 798     }
 799
 800     return 0;
 801 }
 802
 803 /*****************************************************************************
 804  * VideoGetBuffer: Build an alternate video buffer
 805  *****************************************************************************/
 806 static block_t *VideoGetBuffer( sout_stream_t *p_stream, sout_stream_id_t *id,
 807                                 block_t *p_buffer )
 808 {
 809     sout_stream_sys_t *p_sys = p_stream->p_sys;
 810     int i_out;
 811     block_t *p_out;
 812
 813     id->p_frame->quality = p_sys->i_qscale * powf(2.0, FF_LAMBDA_SHIFT + 7.0)
 814                             / 139.0;
 815     id->p_frame->interlaced_frame = 0;
 816     id->p_frame->top_field_first = 1;
 817     id->p_frame->pts = p_buffer->i_dts;
 818
 819     if ( id->i_nb_pred >= p_sys->i_gop )
 820     {
 821         id->p_frame->pict_type = FF_I_TYPE;
 822 #if 0
 823         id->p_frame->me_threshold = 0;
 824         id->p_frame->mb_threshold = 0;
 825 #endif
 826         id->i_nb_pred = 0;
 827     }
 828     else
 829     {
 830         id->p_frame->pict_type = FF_P_TYPE;
 831 #if 0
 832         if ( id->p_frame->mb_type != NULL )
 833         {
 834             id->p_frame->me_threshold = MAX_THRESHOLD;
 835             id->p_frame->mb_threshold = MAX_THRESHOLD;
 836         }
 837 #endif
 838         id->i_nb_pred++;
 839     }
 840
 841     i_out = avcodec_encode_video( id->ff_enc_c, id->p_buffer_out,
 842                                   id->ff_enc_c->width * id->ff_enc_c->height * 3,
 843                                   id->p_frame );
 844
 845     if ( i_out <= 0 )
 846         return NULL;
 847
 848 #if 0
 849     if ( id->p_frame->mb_type == NULL
 850           && id->ff_enc_c->coded_frame->pict_type != FF_I_TYPE )
 851     {
 852         int mb_width = (id->ff_enc_c->width + 15) / 16;
 853         int mb_height = (id->ff_enc_c->height + 15) / 16;
 854         int h_chroma_shift, v_chroma_shift;
 855         int i;
 856
 857         avcodec_get_chroma_sub_sample( id->ff_enc_c->pix_fmt, &h_chroma_shift,
 858                                        &v_chroma_shift );
 859
 860         id->p_frame->motion_subsample_log2
 861             = id->ff_enc_c->coded_frame->motion_subsample_log2;
 862         id->p_frame->mb_type = malloc( ((mb_width + 1) * (mb_height + 1) + 1)
 863                                     * sizeof(uint32_t) );
 864         vlc_memcpy( id->p_frame->mb_type, id->ff_enc_c->coded_frame->mb_type,
 865                     (mb_width + 1) * mb_height * sizeof(id->p_frame->mb_type[0]));
 866
 867         for ( i = 0; i < 2; i++ )
 868         {
 869             int stride = ((16 * mb_width )
 870                     >> id->ff_enc_c->coded_frame->motion_subsample_log2) + 1;
 871             int height = ((16 * mb_height)
 872                     >> id->ff_enc_c->coded_frame->motion_subsample_log2);
 873             int b8_stride = mb_width * 2 + 1;
 874
 875             if ( id->ff_enc_c->coded_frame->motion_val[i] )
 876             {
 877                 id->p_frame->motion_val[i] = malloc( 2 * stride * height
 878                                                 * sizeof(int16_t) );
 879                 vlc_memcpy( id->p_frame->motion_val[i],
 880                             id->ff_enc_c->coded_frame->motion_val[i],
 881                             2 * stride * height * sizeof(int16_t) );
 882             }
 883             if ( id->ff_enc_c->coded_frame->ref_index[i] )
 884             {
 885                 id->p_frame->ref_index[i] = malloc( b8_stride * 2 * mb_height
 886                                                * sizeof(int8_t) );
 887                 vlc_memcpy( id->p_frame->ref_index[i],
 888                             id->ff_enc_c->coded_frame->ref_index[i],
 889                             b8_stride * 2 * mb_height * sizeof(int8_t));
 890             }
 891         }
 892     }
 893 #endif
 894
 895     p_out = block_New( p_stream, i_out );
 896     vlc_memcpy( p_out->p_buffer, id->p_buffer_out, i_out );
 897     p_out->i_length = p_buffer->i_length;
 898     p_out->i_pts = p_buffer->i_dts;
 899     p_out->i_dts = p_buffer->i_dts;
 900     p_out->i_rate = p_buffer->i_rate;
 901
 902     switch ( id->ff_enc_c->coded_frame->pict_type )
 903     {
 904     case FF_I_TYPE:
 905         p_out->i_flags |= BLOCK_FLAG_TYPE_I;
 906         break;
 907     case FF_P_TYPE:
 908         p_out->i_flags |= BLOCK_FLAG_TYPE_P;
 909         break;
 910     case FF_B_TYPE:
 911         p_out->i_flags |= BLOCK_FLAG_TYPE_B;
 912         break;
 913     default:
 914         break;
 915     }
 916
 917     block_Release( p_buffer );
 918
 919     return p_out;
 920 }
 921
 922 /*****************************************************************************
 923  * AudioGetBuffer: Build an alternate audio buffer
 924  *****************************************************************************/
 925 static block_t *AudioGetBuffer( sout_stream_t *p_stream, sout_stream_id_t *id,
 926                                 block_t *p_buffer )
 927 {
 928     int i_out;
 929     block_t *p_out;
 930
 931     i_out = avcodec_encode_audio( id->ff_enc_c, id->p_buffer_out,
 932                                   2 * AVCODEC_MAX_AUDIO_FRAME_SIZE,
 933                                   id->p_samples );
 934
 935     if ( i_out <= 0 )
 936         return NULL;
 937
 938     p_out = block_New( p_stream, i_out );
 939     vlc_memcpy( p_out->p_buffer, id->p_buffer_out, i_out );
 940     p_out->i_length = p_buffer->i_length;
 941     p_out->i_pts = p_buffer->i_dts;
 942     p_out->i_dts = p_buffer->i_dts;
 943     p_out->i_rate = p_buffer->i_rate;
 944
 945     block_Release( p_buffer );
 946
 947     return p_out;
 948 }