modules/codec/theora.c

   1 /*****************************************************************************
   2  * theora.c: theora decoder module making use of libtheora.
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@videolan.org>
   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 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_plugin.h>
  33 #include <vlc_codec.h>
  34 #include <vlc_sout.h>
  35 #include <vlc_input.h>
  36 #include "../demux/xiph.h"
  37
  38 #include <ogg/ogg.h>
  39
  40 #include <theora/theora.h>
  41
  42 /*****************************************************************************
  43  * decoder_sys_t : theora decoder descriptor
  44  *****************************************************************************/
  45 struct decoder_sys_t
  46 {
  47     /* Module mode */
  48     bool b_packetizer;
  49
  50     /*
  51      * Input properties
  52      */
  53     bool b_has_headers;
  54
  55     /*
  56      * Theora properties
  57      */
  58     theora_info      ti;                        /* theora bitstream settings */
  59     theora_comment   tc;                            /* theora comment header */
  60     theora_state     td;                   /* theora bitstream user comments */
  61
  62     /*
  63      * Decoding properties
  64      */
  65     bool b_decoded_first_keyframe;
  66
  67     /*
  68      * Common properties
  69      */
  70     mtime_t i_pts;
  71 };
  72
  73 /*****************************************************************************
  74  * Local prototypes
  75  *****************************************************************************/
  76 static int  OpenDecoder   ( vlc_object_t * );
  77 static int  OpenPacketizer( vlc_object_t * );
  78 static void CloseDecoder  ( vlc_object_t * );
  79
  80 static void *DecodeBlock  ( decoder_t *, block_t ** );
  81 static int  ProcessHeaders( decoder_t * );
  82 static void *ProcessPacket ( decoder_t *, ogg_packet *, block_t ** );
  83
  84 static picture_t *DecodePacket( decoder_t *, ogg_packet * );
  85
  86 static void ParseTheoraComments( decoder_t * );
  87 static void theora_CopyPicture( picture_t *, yuv_buffer * );
  88
  89 static int  OpenEncoder( vlc_object_t *p_this );
  90 static void CloseEncoder( vlc_object_t *p_this );
  91 static block_t *Encode( encoder_t *p_enc, picture_t *p_pict );
  92
  93 /*****************************************************************************
  94  * Module descriptor
  95  *****************************************************************************/
  96 #define ENC_QUALITY_TEXT N_("Encoding quality")
  97 #define ENC_QUALITY_LONGTEXT N_( \
  98   "Enforce a quality between 1 (low) and 10 (high), instead " \
  99   "of specifying a particular bitrate. This will produce a VBR stream." )
 100
 101 vlc_module_begin ()
 102     set_category( CAT_INPUT )
 103     set_subcategory( SUBCAT_INPUT_VCODEC )
 104     set_shortname( "Theora" )
 105     set_description( N_("Theora video decoder") )
 106     set_capability( "decoder", 100 )
 107     set_callbacks( OpenDecoder, CloseDecoder )
 108     add_shortcut( "theora" )
 109
 110     add_submodule ()
 111     set_description( N_("Theora video packetizer") )
 112     set_capability( "packetizer", 100 )
 113     set_callbacks( OpenPacketizer, CloseDecoder )
 114     add_shortcut( "theora" )
 115
 116     add_submodule ()
 117     set_description( N_("Theora video encoder") )
 118     set_capability( "encoder", 150 )
 119     set_callbacks( OpenEncoder, CloseEncoder )
 120     add_shortcut( "theora" )
 121
 122 #   define ENC_CFG_PREFIX "sout-theora-"
 123     add_integer( ENC_CFG_PREFIX "quality", 2, ENC_QUALITY_TEXT,
 124                  ENC_QUALITY_LONGTEXT, false )
 125 vlc_module_end ()
 126
 127 static const char *const ppsz_enc_options[] = {
 128     "quality", NULL
 129 };
 130
 131 /*****************************************************************************
 132  * OpenDecoder: probe the decoder and return score
 133  *****************************************************************************/
 134 static int OpenDecoder( vlc_object_t *p_this )
 135 {
 136     decoder_t *p_dec = (decoder_t*)p_this;
 137     decoder_sys_t *p_sys;
 138
 139     if( p_dec->fmt_in.i_codec != VLC_CODEC_THEORA )
 140     {
 141         return VLC_EGENERIC;
 142     }
 143
 144     /* Allocate the memory needed to store the decoder's structure */
 145     if( ( p_dec->p_sys = p_sys = malloc(sizeof(*p_sys)) ) == NULL )
 146         return VLC_ENOMEM;
 147     p_dec->p_sys->b_packetizer = false;
 148     p_sys->b_has_headers = false;
 149     p_sys->i_pts = VLC_TS_INVALID;
 150     p_sys->b_decoded_first_keyframe = false;
 151
 152     /* Set output properties */
 153     p_dec->fmt_out.i_cat = VIDEO_ES;
 154     p_dec->fmt_out.i_codec = VLC_CODEC_I420;
 155
 156     /* Set callbacks */
 157     p_dec->pf_decode_video = (picture_t *(*)(decoder_t *, block_t **))
 158         DecodeBlock;
 159     p_dec->pf_packetize    = (block_t *(*)(decoder_t *, block_t **))
 160         DecodeBlock;
 161
 162     /* Init supporting Theora structures needed in header parsing */
 163     theora_comment_init( &p_sys->tc );
 164     theora_info_init( &p_sys->ti );
 165
 166     return VLC_SUCCESS;
 167 }
 168
 169 static int OpenPacketizer( vlc_object_t *p_this )
 170 {
 171     decoder_t *p_dec = (decoder_t*)p_this;
 172
 173     int i_ret = OpenDecoder( p_this );
 174
 175     if( i_ret == VLC_SUCCESS )
 176     {
 177         p_dec->p_sys->b_packetizer = true;
 178         p_dec->fmt_out.i_codec = VLC_CODEC_THEORA;
 179     }
 180
 181     return i_ret;
 182 }
 183
 184 /****************************************************************************
 185  * DecodeBlock: the whole thing
 186  ****************************************************************************
 187  * This function must be fed with ogg packets.
 188  ****************************************************************************/
 189 static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 190 {
 191     decoder_sys_t *p_sys = p_dec->p_sys;
 192     block_t *p_block;
 193     ogg_packet oggpacket;
 194
 195     if( !pp_block || !*pp_block ) return NULL;
 196
 197     p_block = *pp_block;
 198
 199     /* Block to Ogg packet */
 200     oggpacket.packet = p_block->p_buffer;
 201     oggpacket.bytes = p_block->i_buffer;
 202     oggpacket.granulepos = p_block->i_dts;
 203     oggpacket.b_o_s = 0;
 204     oggpacket.e_o_s = 0;
 205     oggpacket.packetno = 0;
 206
 207     /* Check for headers */
 208     if( !p_sys->b_has_headers )
 209     {
 210         if( ProcessHeaders( p_dec ) )
 211         {
 212             block_Release( *pp_block );
 213             return NULL;
 214         }
 215         p_sys->b_has_headers = true;
 216     }
 217
 218     return ProcessPacket( p_dec, &oggpacket, pp_block );
 219 }
 220
 221 /*****************************************************************************
 222  * ProcessHeaders: process Theora headers.
 223  *****************************************************************************/
 224 static int ProcessHeaders( decoder_t *p_dec )
 225 {
 226     decoder_sys_t *p_sys = p_dec->p_sys;
 227     ogg_packet oggpacket;
 228
 229     unsigned pi_size[XIPH_MAX_HEADER_COUNT];
 230     void     *pp_data[XIPH_MAX_HEADER_COUNT];
 231     unsigned i_count;
 232     if( xiph_SplitHeaders( pi_size, pp_data, &i_count,
 233                            p_dec->fmt_in.i_extra, p_dec->fmt_in.p_extra) )
 234         return VLC_EGENERIC;
 235     if( i_count < 3 )
 236         goto error;
 237
 238     oggpacket.granulepos = -1;
 239     oggpacket.e_o_s = 0;
 240     oggpacket.packetno = 0;
 241
 242     /* Take care of the initial Vorbis header */
 243     oggpacket.b_o_s  = 1; /* yes this actually is a b_o_s packet :) */
 244     oggpacket.bytes  = pi_size[0];
 245     oggpacket.packet = pp_data[0];
 246     if( theora_decode_header( &p_sys->ti, &p_sys->tc, &oggpacket ) < 0 )
 247     {
 248         msg_Err( p_dec, "this bitstream does not contain Theora video data" );
 249         goto error;
 250     }
 251
 252     /* Set output properties */
 253     if( !p_sys->b_packetizer )
 254     switch( p_sys->ti.pixelformat )
 255     {
 256       case OC_PF_420:
 257         p_dec->fmt_out.i_codec = VLC_CODEC_I420;
 258         break;
 259       case OC_PF_422:
 260         p_dec->fmt_out.i_codec = VLC_CODEC_I422;
 261         break;
 262       case OC_PF_444:
 263         p_dec->fmt_out.i_codec = VLC_CODEC_I444;
 264         break;
 265       case OC_PF_RSVD:
 266       default:
 267         msg_Err( p_dec, "unknown chroma in theora sample" );
 268         break;
 269     }
 270     p_dec->fmt_out.video.i_width = p_sys->ti.width;
 271     p_dec->fmt_out.video.i_height = p_sys->ti.height;
 272     if( p_sys->ti.frame_width && p_sys->ti.frame_height )
 273     {
 274         p_dec->fmt_out.video.i_visible_width = p_sys->ti.frame_width;
 275         p_dec->fmt_out.video.i_visible_height = p_sys->ti.frame_height;
 276         if( p_sys->ti.offset_x || p_sys->ti.offset_y )
 277         {
 278             p_dec->fmt_out.video.i_x_offset = p_sys->ti.offset_x;
 279             p_dec->fmt_out.video.i_y_offset = p_sys->ti.offset_y;
 280         }
 281     }
 282
 283     if( p_sys->ti.aspect_denominator && p_sys->ti.aspect_numerator )
 284     {
 285         p_dec->fmt_out.video.i_sar_num = p_sys->ti.aspect_numerator;
 286         p_dec->fmt_out.video.i_sar_den = p_sys->ti.aspect_denominator;
 287     }
 288     else
 289     {
 290         p_dec->fmt_out.video.i_sar_num = 1;
 291         p_dec->fmt_out.video.i_sar_den = 1;
 292     }
 293
 294     if( p_sys->ti.fps_numerator > 0 && p_sys->ti.fps_denominator > 0 )
 295     {
 296         p_dec->fmt_out.video.i_frame_rate = p_sys->ti.fps_numerator;
 297         p_dec->fmt_out.video.i_frame_rate_base = p_sys->ti.fps_denominator;
 298     }
 299
 300     msg_Dbg( p_dec, "%dx%d %.02f fps video, frame content "
 301              "is %dx%d with offset (%d,%d)",
 302              p_sys->ti.width, p_sys->ti.height,
 303              (double)p_sys->ti.fps_numerator/p_sys->ti.fps_denominator,
 304              p_sys->ti.frame_width, p_sys->ti.frame_height,
 305              p_sys->ti.offset_x, p_sys->ti.offset_y );
 306
 307     /* Sanity check that seems necessary for some corrupted files */
 308     if( p_sys->ti.width < p_sys->ti.frame_width ||
 309         p_sys->ti.height < p_sys->ti.frame_height )
 310     {
 311         msg_Warn( p_dec, "trying to correct invalid theora header "
 312                   "(frame size (%dx%d) is smaller than frame content (%d,%d))",
 313                   p_sys->ti.width, p_sys->ti.height,
 314                   p_sys->ti.frame_width, p_sys->ti.frame_height );
 315
 316         if( p_sys->ti.width < p_sys->ti.frame_width )
 317             p_sys->ti.width = p_sys->ti.frame_width;
 318         if( p_sys->ti.height < p_sys->ti.frame_height )
 319             p_sys->ti.height = p_sys->ti.frame_height;
 320     }
 321
 322     /* The next packet in order is the comments header */
 323     oggpacket.b_o_s  = 0;
 324     oggpacket.bytes  = pi_size[1];
 325     oggpacket.packet = pp_data[1];
 326     if( theora_decode_header( &p_sys->ti, &p_sys->tc, &oggpacket ) < 0 )
 327     {
 328         msg_Err( p_dec, "2nd Theora header is corrupted" );
 329         goto error;
 330     }
 331
 332     ParseTheoraComments( p_dec );
 333
 334     /* The next packet in order is the codebooks header
 335      * We need to watch out that this packet is not missing as a
 336      * missing or corrupted header is fatal. */
 337     oggpacket.b_o_s  = 0;
 338     oggpacket.bytes  = pi_size[2];
 339     oggpacket.packet = pp_data[2];
 340     if( theora_decode_header( &p_sys->ti, &p_sys->tc, &oggpacket ) < 0 )
 341     {
 342         msg_Err( p_dec, "3rd Theora header is corrupted" );
 343         goto error;
 344     }
 345
 346     if( !p_sys->b_packetizer )
 347     {
 348         /* We have all the headers, initialize decoder */
 349         theora_decode_init( &p_sys->td, &p_sys->ti );
 350     }
 351     else
 352     {
 353         p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
 354         p_dec->fmt_out.p_extra = xrealloc( p_dec->fmt_out.p_extra,
 355                                                   p_dec->fmt_out.i_extra );
 356         memcpy( p_dec->fmt_out.p_extra,
 357                 p_dec->fmt_in.p_extra, p_dec->fmt_out.i_extra );
 358     }
 359
 360     for( unsigned i = 0; i < i_count; i++ )
 361         free( pp_data[i] );
 362     return VLC_SUCCESS;
 363
 364 error:
 365     for( unsigned i = 0; i < i_count; i++ )
 366         free( pp_data[i] );
 367     return VLC_EGENERIC;
 368 }
 369
 370 /*****************************************************************************
 371  * ProcessPacket: processes a theora packet.
 372  *****************************************************************************/
 373 static void *ProcessPacket( decoder_t *p_dec, ogg_packet *p_oggpacket,
 374                             block_t **pp_block )
 375 {
 376     decoder_sys_t *p_sys = p_dec->p_sys;
 377     block_t *p_block = *pp_block;
 378     void *p_buf;
 379
 380     if( ( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) ) != 0 )
 381     {
 382         /* Don't send the the first packet after a discontinuity to
 383          * theora_decode, otherwise we get purple/green display artifacts
 384          * appearing in the video output */
 385         return NULL;
 386     }
 387
 388     /* Date management */
 389     if( p_block->i_pts > VLC_TS_INVALID && p_block->i_pts != p_sys->i_pts )
 390     {
 391         p_sys->i_pts = p_block->i_pts;
 392     }
 393
 394     *pp_block = NULL; /* To avoid being fed the same packet again */
 395
 396     if( p_sys->b_packetizer )
 397     {
 398         /* Date management */
 399         p_block->i_dts = p_block->i_pts = p_sys->i_pts;
 400
 401         p_block->i_length = p_sys->i_pts - p_block->i_pts;
 402
 403         p_buf = p_block;
 404     }
 405     else
 406     {
 407         p_buf = DecodePacket( p_dec, p_oggpacket );
 408         if( p_block )
 409             block_Release( p_block );
 410     }
 411
 412     /* Date management */
 413     p_sys->i_pts += ( INT64_C(1000000) * p_sys->ti.fps_denominator /
 414                       p_sys->ti.fps_numerator ); /* 1 frame per packet */
 415
 416     return p_buf;
 417 }
 418
 419 /*****************************************************************************
 420  * DecodePacket: decodes a Theora packet.
 421  *****************************************************************************/
 422 static picture_t *DecodePacket( decoder_t *p_dec, ogg_packet *p_oggpacket )
 423 {
 424     decoder_sys_t *p_sys = p_dec->p_sys;
 425     picture_t *p_pic;
 426     yuv_buffer yuv;
 427
 428     theora_decode_packetin( &p_sys->td, p_oggpacket );
 429
 430     /* Check for keyframe */
 431     if( !(p_oggpacket->packet[0] & 0x80) /* data packet */ &&
 432         !(p_oggpacket->packet[0] & 0x40) /* intra frame */ )
 433         p_sys->b_decoded_first_keyframe = true;
 434
 435     /* If we haven't seen a single keyframe yet, don't let Theora decode
 436      * anything, otherwise we'll get display artifacts.  (This is impossible
 437      * in the general case, but can happen if e.g. we play a network stream
 438      * using a timed URL, such that the server doesn't start the video with a
 439      * keyframe). */
 440     if( p_sys->b_decoded_first_keyframe )
 441         theora_decode_YUVout( &p_sys->td, &yuv );
 442     else
 443         return NULL;
 444
 445     /* Get a new picture */
 446     p_pic = decoder_NewPicture( p_dec );
 447     if( !p_pic ) return NULL;
 448
 449     theora_CopyPicture( p_pic, &yuv );
 450
 451     p_pic->date = p_sys->i_pts;
 452
 453     return p_pic;
 454 }
 455
 456 /*****************************************************************************
 457  * ParseTheoraComments:
 458  *****************************************************************************/
 459 static void ParseTheoraComments( decoder_t *p_dec )
 460 {
 461     char *psz_name, *psz_value, *psz_comment;
 462     int i = 0;
 463
 464     while ( i < p_dec->p_sys->tc.comments )
 465     {
 466         psz_comment = strdup( p_dec->p_sys->tc.user_comments[i] );
 467         if( !psz_comment )
 468             break;
 469         psz_name = psz_comment;
 470         psz_value = strchr( psz_comment, '=' );
 471         if( psz_value )
 472         {
 473             *psz_value = '\0';
 474             psz_value++;
 475
 476             if( !p_dec->p_description )
 477                 p_dec->p_description = vlc_meta_New();
 478             if( p_dec->p_description )
 479                 vlc_meta_AddExtra( p_dec->p_description, psz_name, psz_value );
 480         }
 481         free( psz_comment );
 482         i++;
 483     }
 484 }
 485
 486 /*****************************************************************************
 487  * CloseDecoder: theora decoder destruction
 488  *****************************************************************************/
 489 static void CloseDecoder( vlc_object_t *p_this )
 490 {
 491     decoder_t *p_dec = (decoder_t *)p_this;
 492     decoder_sys_t *p_sys = p_dec->p_sys;
 493
 494     theora_info_clear( &p_sys->ti );
 495     theora_comment_clear( &p_sys->tc );
 496
 497     free( p_sys );
 498 }
 499
 500 /*****************************************************************************
 501  * theora_CopyPicture: copy a picture from theora internal buffers to a
 502  *                     picture_t structure.
 503  *****************************************************************************/
 504 static void theora_CopyPicture( picture_t *p_pic,
 505                                 yuv_buffer *yuv )
 506 {
 507     int i_plane, i_line, i_dst_stride, i_src_stride;
 508     uint8_t *p_dst, *p_src;
 509
 510     for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 511     {
 512         p_dst = p_pic->p[i_plane].p_pixels;
 513         p_src = i_plane ? (i_plane - 1 ? yuv->v : yuv->u ) : yuv->y;
 514         i_dst_stride  = p_pic->p[i_plane].i_pitch;
 515         i_src_stride  = i_plane ? yuv->uv_stride : yuv->y_stride;
 516
 517         for( i_line = 0; i_line < p_pic->p[i_plane].i_lines; i_line++ )
 518         {
 519             vlc_memcpy( p_dst, p_src,
 520                         i_plane ? yuv->uv_width : yuv->y_width );
 521             p_src += i_src_stride;
 522             p_dst += i_dst_stride;
 523         }
 524     }
 525 }
 526
 527 /*****************************************************************************
 528  * encoder_sys_t : theora encoder descriptor
 529  *****************************************************************************/
 530 struct encoder_sys_t
 531 {
 532     /*
 533      * Input properties
 534      */
 535     bool b_headers;
 536
 537     /*
 538      * Theora properties
 539      */
 540     theora_info      ti;                        /* theora bitstream settings */
 541     theora_comment   tc;                            /* theora comment header */
 542     theora_state     td;                   /* theora bitstream user comments */
 543
 544     int i_width, i_height;
 545 };
 546
 547 /*****************************************************************************
 548  * OpenEncoder: probe the encoder and return score
 549  *****************************************************************************/
 550 static int OpenEncoder( vlc_object_t *p_this )
 551 {
 552     encoder_t *p_enc = (encoder_t *)p_this;
 553     encoder_sys_t *p_sys;
 554     int i_quality;
 555
 556     if( p_enc->fmt_out.i_codec != VLC_CODEC_THEORA &&
 557         !p_enc->b_force )
 558     {
 559         return VLC_EGENERIC;
 560     }
 561
 562     /* Allocate the memory needed to store the decoder's structure */
 563     if( ( p_sys = malloc(sizeof(encoder_sys_t)) ) == NULL )
 564         return VLC_ENOMEM;
 565     p_enc->p_sys = p_sys;
 566
 567     p_enc->pf_encode_video = Encode;
 568     p_enc->fmt_in.i_codec = VLC_CODEC_I420;
 569     p_enc->fmt_out.i_codec = VLC_CODEC_THEORA;
 570
 571     config_ChainParse( p_enc, ENC_CFG_PREFIX, ppsz_enc_options, p_enc->p_cfg );
 572
 573     i_quality = var_GetInteger( p_enc, ENC_CFG_PREFIX "quality" );
 574     if( i_quality > 10 ) i_quality = 10;
 575     if( i_quality < 0 ) i_quality = 0;
 576
 577     theora_info_init( &p_sys->ti );
 578
 579     p_sys->ti.width = p_enc->fmt_in.video.i_width;
 580     p_sys->ti.height = p_enc->fmt_in.video.i_height;
 581
 582     if( p_sys->ti.width % 16 || p_sys->ti.height % 16 )
 583     {
 584         /* Pictures from the transcoder should always have a pitch
 585          * which is a multiple of 16 */
 586         p_sys->ti.width = (p_sys->ti.width + 15) >> 4 << 4;
 587         p_sys->ti.height = (p_sys->ti.height + 15) >> 4 << 4;
 588
 589         msg_Dbg( p_enc, "padding video from %dx%d to %dx%d",
 590                  p_enc->fmt_in.video.i_width, p_enc->fmt_in.video.i_height,
 591                  p_sys->ti.width, p_sys->ti.height );
 592     }
 593
 594     p_sys->ti.frame_width = p_enc->fmt_in.video.i_width;
 595     p_sys->ti.frame_height = p_enc->fmt_in.video.i_height;
 596     p_sys->ti.offset_x = 0 /*frame_x_offset*/;
 597     p_sys->ti.offset_y = 0 /*frame_y_offset*/;
 598
 599     p_sys->i_width = p_sys->ti.width;
 600     p_sys->i_height = p_sys->ti.height;
 601
 602     if( !p_enc->fmt_in.video.i_frame_rate ||
 603         !p_enc->fmt_in.video.i_frame_rate_base )
 604     {
 605         p_sys->ti.fps_numerator = 25;
 606         p_sys->ti.fps_denominator = 1;
 607     }
 608     else
 609     {
 610         p_sys->ti.fps_numerator = p_enc->fmt_in.video.i_frame_rate;
 611         p_sys->ti.fps_denominator = p_enc->fmt_in.video.i_frame_rate_base;
 612     }
 613
 614     if( p_enc->fmt_in.video.i_sar_num > 0 && p_enc->fmt_in.video.i_sar_den > 0 )
 615     {
 616         unsigned i_dst_num, i_dst_den;
 617         vlc_ureduce( &i_dst_num, &i_dst_den,
 618                      p_enc->fmt_in.video.i_sar_num,
 619                      p_enc->fmt_in.video.i_sar_den, 0 );
 620         p_sys->ti.aspect_numerator = i_dst_num;
 621         p_sys->ti.aspect_denominator = i_dst_den;
 622     }
 623     else
 624     {
 625         p_sys->ti.aspect_numerator = 4;
 626         p_sys->ti.aspect_denominator = 3;
 627     }
 628
 629     p_sys->ti.target_bitrate = p_enc->fmt_out.i_bitrate;
 630     p_sys->ti.quality = ((float)i_quality) * 6.3;
 631
 632     p_sys->ti.dropframes_p = 0;
 633     p_sys->ti.quick_p = 1;
 634     p_sys->ti.keyframe_auto_p = 1;
 635     p_sys->ti.keyframe_frequency = 64;
 636     p_sys->ti.keyframe_frequency_force = 64;
 637     p_sys->ti.keyframe_data_target_bitrate = p_enc->fmt_out.i_bitrate * 1.5;
 638     p_sys->ti.keyframe_auto_threshold = 80;
 639     p_sys->ti.keyframe_mindistance = 8;
 640     p_sys->ti.noise_sensitivity = 1;
 641
 642     theora_encode_init( &p_sys->td, &p_sys->ti );
 643     theora_comment_init( &p_sys->tc );
 644
 645     /* Create and store headers */
 646     for( int i = 0; i < 3; i++ )
 647     {
 648         ogg_packet header;
 649
 650         if( i == 0 )
 651             theora_encode_header( &p_sys->td, &header );
 652         else if( i == 1 )
 653             theora_encode_comment( &p_sys->tc, &header );
 654         else
 655             theora_encode_tables( &p_sys->td, &header );
 656
 657         if( xiph_AppendHeaders( &p_enc->fmt_out.i_extra, &p_enc->fmt_out.p_extra,
 658                                 header.bytes, header.packet ) )
 659         {
 660             p_enc->fmt_out.i_extra = 0;
 661             p_enc->fmt_out.p_extra = NULL;
 662         }
 663     }
 664     return VLC_SUCCESS;
 665 }
 666
 667 /****************************************************************************
 668  * Encode: the whole thing
 669  ****************************************************************************
 670  * This function spits out ogg packets.
 671  ****************************************************************************/
 672 static block_t *Encode( encoder_t *p_enc, picture_t *p_pict )
 673 {
 674     encoder_sys_t *p_sys = p_enc->p_sys;
 675     ogg_packet oggpacket;
 676     block_t *p_block;
 677     yuv_buffer yuv;
 678     int i;
 679
 680     if( !p_pict ) return NULL;
 681     /* Sanity check */
 682     if( p_pict->p[0].i_pitch < (int)p_sys->i_width ||
 683         p_pict->p[0].i_lines < (int)p_sys->i_height )
 684     {
 685         msg_Warn( p_enc, "frame is smaller than encoding size"
 686                   "(%ix%i->%ix%i) -> dropping frame",
 687                   p_pict->p[0].i_pitch, p_pict->p[0].i_lines,
 688                   p_sys->i_width, p_sys->i_height );
 689         return NULL;
 690     }
 691
 692     /* Fill padding */
 693     if( p_pict->p[0].i_visible_pitch < (int)p_sys->i_width )
 694     {
 695         for( i = 0; i < p_sys->i_height; i++ )
 696         {
 697             memset( p_pict->p[0].p_pixels + i * p_pict->p[0].i_pitch +
 698                     p_pict->p[0].i_visible_pitch,
 699                     *( p_pict->p[0].p_pixels + i * p_pict->p[0].i_pitch +
 700                        p_pict->p[0].i_visible_pitch - 1 ),
 701                     p_sys->i_width - p_pict->p[0].i_visible_pitch );
 702         }
 703         for( i = 0; i < p_sys->i_height / 2; i++ )
 704         {
 705             memset( p_pict->p[1].p_pixels + i * p_pict->p[1].i_pitch +
 706                     p_pict->p[1].i_visible_pitch,
 707                     *( p_pict->p[1].p_pixels + i * p_pict->p[1].i_pitch +
 708                        p_pict->p[1].i_visible_pitch - 1 ),
 709                     p_sys->i_width / 2 - p_pict->p[1].i_visible_pitch );
 710             memset( p_pict->p[2].p_pixels + i * p_pict->p[2].i_pitch +
 711                     p_pict->p[2].i_visible_pitch,
 712                     *( p_pict->p[2].p_pixels + i * p_pict->p[2].i_pitch +
 713                        p_pict->p[2].i_visible_pitch - 1 ),
 714                     p_sys->i_width / 2 - p_pict->p[2].i_visible_pitch );
 715         }
 716     }
 717
 718     if( p_pict->p[0].i_visible_lines < (int)p_sys->i_height )
 719     {
 720         for( i = p_pict->p[0].i_visible_lines; i < p_sys->i_height; i++ )
 721         {
 722             memset( p_pict->p[0].p_pixels + i * p_pict->p[0].i_pitch, 0,
 723                     p_sys->i_width );
 724         }
 725         for( i = p_pict->p[1].i_visible_lines; i < p_sys->i_height / 2; i++ )
 726         {
 727             memset( p_pict->p[1].p_pixels + i * p_pict->p[1].i_pitch, 0x80,
 728                     p_sys->i_width / 2 );
 729             memset( p_pict->p[2].p_pixels + i * p_pict->p[2].i_pitch, 0x80,
 730                     p_sys->i_width / 2 );
 731         }
 732     }
 733
 734     /* Theora is a one-frame-in, one-frame-out system. Submit a frame
 735      * for compression and pull out the packet. */
 736
 737     yuv.y_width  = p_sys->i_width;
 738     yuv.y_height = p_sys->i_height;
 739     yuv.y_stride = p_pict->p[0].i_pitch;
 740
 741     yuv.uv_width  = p_sys->i_width / 2;
 742     yuv.uv_height = p_sys->i_height / 2;
 743     yuv.uv_stride = p_pict->p[1].i_pitch;
 744
 745     yuv.y = p_pict->p[0].p_pixels;
 746     yuv.u = p_pict->p[1].p_pixels;
 747     yuv.v = p_pict->p[2].p_pixels;
 748
 749     if( theora_encode_YUVin( &p_sys->td, &yuv ) < 0 )
 750     {
 751         msg_Warn( p_enc, "failed encoding a frame" );
 752         return NULL;
 753     }
 754
 755     theora_encode_packetout( &p_sys->td, 0, &oggpacket );
 756
 757     /* Ogg packet to block */
 758     p_block = block_New( p_enc, oggpacket.bytes );
 759     memcpy( p_block->p_buffer, oggpacket.packet, oggpacket.bytes );
 760     p_block->i_dts = p_block->i_pts = p_pict->date;
 761
 762     if( theora_packet_iskeyframe( &oggpacket ) )
 763     {
 764         p_block->i_flags |= BLOCK_FLAG_TYPE_I;
 765     }
 766
 767     return p_block;
 768 }
 769
 770 /*****************************************************************************
 771  * CloseEncoder: theora encoder destruction
 772  *****************************************************************************/
 773 static void CloseEncoder( vlc_object_t *p_this )
 774 {
 775     encoder_t *p_enc = (encoder_t *)p_this;
 776     encoder_sys_t *p_sys = p_enc->p_sys;
 777
 778     theora_info_clear( &p_sys->ti );
 779     theora_comment_clear( &p_sys->tc );
 780
 781     free( p_sys );
 782 }