modules/codec/schroedinger.c

   1 /*****************************************************************************
   2  * schroedinger.c: Dirac decoder module making use of libschroedinger.
   3  *          (http://www.bbc.co.uk/rd/projects/dirac/index.shtml)
   4  *          (http://diracvideo.org)
   5  *****************************************************************************
   6  * Copyright (C) 2008 the VideoLAN team
   7  * $Id$
   8  *
   9  * Authors: Jonathan Rosser <jonathan.rosser@gmail.com>
  10  *          David Flynn <davidf at rd dot bbc.co.uk>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #include <vlc_common.h>
  35 #include <vlc_plugin.h>
  36 #include <vlc_codec.h>
  37 #include <vlc_sout.h>
  38
  39 #include <schroedinger/schro.h>
  40
  41 /*****************************************************************************
  42  * Module descriptor
  43  *****************************************************************************/
  44 static int        OpenDecoder  ( vlc_object_t * );
  45 static void       CloseDecoder ( vlc_object_t * );
  46
  47 vlc_module_begin ()
  48     set_category( CAT_INPUT )
  49     set_subcategory( SUBCAT_INPUT_VCODEC )
  50     set_description( N_("Schroedinger video decoder") )
  51     set_capability( "decoder", 200 )
  52     set_callbacks( OpenDecoder, CloseDecoder )
  53     add_shortcut( "schroedinger" )
  54 vlc_module_end ()
  55
  56 /*****************************************************************************
  57  * Local prototypes
  58  *****************************************************************************/
  59 static picture_t *DecodeBlock  ( decoder_t *p_dec, block_t **pp_block );
  60
  61 struct picture_free_t
  62 {
  63    picture_t *p_pic;
  64    decoder_t *p_dec;
  65 };
  66
  67 /*****************************************************************************
  68  * decoder_sys_t : Schroedinger decoder descriptor
  69  *****************************************************************************/
  70 struct decoder_sys_t
  71 {
  72     /*
  73      * Dirac properties
  74      */
  75     mtime_t i_lastpts;
  76     mtime_t i_frame_pts_delta;
  77     SchroDecoder *p_schro;
  78     SchroVideoFormat *p_format;
  79 };
  80
  81 /*****************************************************************************
  82  * OpenDecoder: probe the decoder and return score
  83  *****************************************************************************/
  84 static int OpenDecoder( vlc_object_t *p_this )
  85 {
  86     decoder_t *p_dec = (decoder_t*)p_this;
  87     decoder_sys_t *p_sys;
  88     SchroDecoder *p_schro;
  89
  90     if( p_dec->fmt_in.i_codec != VLC_CODEC_DIRAC )
  91     {
  92         return VLC_EGENERIC;
  93     }
  94
  95     /* Allocate the memory needed to store the decoder's structure */
  96     p_sys = malloc(sizeof(decoder_sys_t));
  97     if( p_sys == NULL )
  98         return VLC_ENOMEM;
  99
 100     /* Initialise the schroedinger (and hence liboil libraries */
 101     /* This does no allocation and is safe to call */
 102     schro_init();
 103
 104     /* Initialise the schroedinger decoder */
 105     if( !(p_schro = schro_decoder_new()) )
 106     {
 107         free( p_sys );
 108         return VLC_EGENERIC;
 109     }
 110
 111     p_dec->p_sys = p_sys;
 112     p_sys->p_schro = p_schro;
 113     p_sys->p_format = NULL;
 114     p_sys->i_lastpts = VLC_TS_INVALID;
 115     p_sys->i_frame_pts_delta = 0;
 116
 117     /* Set output properties */
 118     p_dec->fmt_out.i_cat = VIDEO_ES;
 119     p_dec->fmt_out.i_codec = VLC_CODEC_I420;
 120
 121     /* Set callbacks */
 122     p_dec->pf_decode_video = DecodeBlock;
 123
 124     return VLC_SUCCESS;
 125 }
 126
 127 /*****************************************************************************
 128  * SetPictureFormat: Set the decoded picture params to the ones from the stream
 129  *****************************************************************************/
 130 static void SetVideoFormat( decoder_t *p_dec )
 131 {
 132     decoder_sys_t *p_sys = p_dec->p_sys;
 133
 134     p_sys->p_format = schro_decoder_get_video_format(p_sys->p_schro);
 135     if( p_sys->p_format == NULL ) return;
 136
 137     p_sys->i_frame_pts_delta = INT64_C(1000000)
 138                             * p_sys->p_format->frame_rate_denominator
 139                             / p_sys->p_format->frame_rate_numerator;
 140
 141     switch( p_sys->p_format->chroma_format )
 142     {
 143     case SCHRO_CHROMA_420: p_dec->fmt_out.i_codec = VLC_CODEC_I420; break;
 144     case SCHRO_CHROMA_422: p_dec->fmt_out.i_codec = VLC_CODEC_I422; break;
 145     case SCHRO_CHROMA_444: p_dec->fmt_out.i_codec = VLC_CODEC_I444; break;
 146     default:
 147         p_dec->fmt_out.i_codec = 0;
 148         break;
 149     }
 150
 151     p_dec->fmt_out.video.i_visible_width = p_sys->p_format->clean_width;
 152     p_dec->fmt_out.video.i_x_offset = p_sys->p_format->left_offset;
 153     p_dec->fmt_out.video.i_width = p_sys->p_format->width;
 154
 155     p_dec->fmt_out.video.i_visible_height = p_sys->p_format->clean_height;
 156     p_dec->fmt_out.video.i_y_offset = p_sys->p_format->top_offset;
 157     p_dec->fmt_out.video.i_height = p_sys->p_format->height;
 158
 159     /* aspect_ratio_[numerator|denominator] describes the pixel aspect ratio */
 160     p_dec->fmt_out.video.i_sar_num = p_sys->p_format->aspect_ratio_numerator;
 161     p_dec->fmt_out.video.i_sar_den = p_sys->p_format->aspect_ratio_denominator;
 162
 163     p_dec->fmt_out.video.i_frame_rate =
 164         p_sys->p_format->frame_rate_numerator;
 165     p_dec->fmt_out.video.i_frame_rate_base =
 166         p_sys->p_format->frame_rate_denominator;
 167 }
 168
 169 /*****************************************************************************
 170  * SchroFrameFree: schro_frame callback to release the associated picture_t
 171  * When schro_decoder_reset() is called there will be pictures in the
 172  * decoding pipeline that need to be released rather than displayed.
 173  *****************************************************************************/
 174 static void SchroFrameFree( SchroFrame *frame, void *priv)
 175 {
 176     struct picture_free_t *p_free = priv;
 177
 178     if( !p_free )
 179         return;
 180
 181     decoder_DeletePicture( p_free->p_dec, p_free->p_pic );
 182     free(p_free);
 183     (void)frame;
 184 }
 185
 186 /*****************************************************************************
 187  * CreateSchroFrameFromPic: wrap a picture_t in a SchroFrame
 188  *****************************************************************************/
 189 static SchroFrame *CreateSchroFrameFromPic( decoder_t *p_dec )
 190 {
 191     decoder_sys_t *p_sys = p_dec->p_sys;
 192     SchroFrame *p_schroframe = schro_frame_new();
 193     picture_t *p_pic = NULL;
 194     struct picture_free_t *p_free;
 195
 196     if( !p_schroframe )
 197         return NULL;
 198
 199     p_pic = decoder_NewPicture( p_dec );
 200
 201     if( !p_pic )
 202         return NULL;
 203
 204     p_schroframe->format = SCHRO_FRAME_FORMAT_U8_420;
 205     if( p_sys->p_format->chroma_format == SCHRO_CHROMA_422 )
 206     {
 207         p_schroframe->format = SCHRO_FRAME_FORMAT_U8_422;
 208     }
 209     else if( p_sys->p_format->chroma_format == SCHRO_CHROMA_444 )
 210     {
 211         p_schroframe->format = SCHRO_FRAME_FORMAT_U8_444;
 212     }
 213
 214     p_schroframe->width = p_sys->p_format->width;
 215     p_schroframe->height = p_sys->p_format->height;
 216
 217     p_free = malloc( sizeof( *p_free ) );
 218     p_free->p_pic = p_pic;
 219     p_free->p_dec = p_dec;
 220     schro_frame_set_free_callback( p_schroframe, SchroFrameFree, p_free );
 221
 222     for( int i=0; i<3; i++ )
 223     {
 224         p_schroframe->components[i].width = p_pic->p[i].i_visible_pitch;
 225         p_schroframe->components[i].stride = p_pic->p[i].i_pitch;
 226         p_schroframe->components[i].height = p_pic->p[i].i_visible_lines;
 227         p_schroframe->components[i].length =
 228             p_pic->p[i].i_pitch * p_pic->p[i].i_lines;
 229         p_schroframe->components[i].data = p_pic->p[i].p_pixels;
 230
 231         if(i!=0)
 232         {
 233             p_schroframe->components[i].v_shift =
 234                 SCHRO_FRAME_FORMAT_V_SHIFT( p_schroframe->format );
 235             p_schroframe->components[i].h_shift =
 236                 SCHRO_FRAME_FORMAT_H_SHIFT( p_schroframe->format );
 237         }
 238     }
 239
 240     p_pic->b_progressive = !p_sys->p_format->interlaced;
 241     p_pic->b_top_field_first = p_sys->p_format->top_field_first;
 242     p_pic->i_nb_fields = 2;
 243
 244     return p_schroframe;
 245 }
 246
 247 /*****************************************************************************
 248  * SchroBufferFree: schro_buffer callback to release the associated block_t
 249  *****************************************************************************/
 250 static void SchroBufferFree( SchroBuffer *buf, void *priv )
 251 {
 252     block_t *p_block = priv;
 253
 254     if( !p_block )
 255         return;
 256
 257     block_Release( p_block );
 258     (void)buf;
 259 }
 260
 261 /*****************************************************************************
 262  * CloseDecoder: decoder destruction
 263  *****************************************************************************/
 264 static void CloseDecoder( vlc_object_t *p_this )
 265 {
 266     decoder_t *p_dec = (decoder_t *)p_this;
 267     decoder_sys_t *p_sys = p_dec->p_sys;
 268
 269     schro_decoder_free( p_sys->p_schro );
 270     free( p_sys );
 271 }
 272
 273 /****************************************************************************
 274  * DecodeBlock: the whole thing
 275  ****************************************************************************
 276  * Blocks need not be Dirac dataunit aligned.
 277  * If a block has a PTS signaled, it applies to the first picture at or after p_block
 278  *
 279  * If this function returns a picture (!NULL), it is called again and the
 280  * same block is resubmitted.  To avoid this, set *pp_block to NULL;
 281  * If this function returns NULL, the *pp_block is lost (and leaked).
 282  * This function must free all blocks when finished with them.
 283  ****************************************************************************/
 284 static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 285 {
 286     decoder_sys_t *p_sys = p_dec->p_sys;
 287
 288     if( !pp_block ) return NULL;
 289
 290     if ( *pp_block ) {
 291         block_t *p_block = *pp_block;
 292
 293         /* reset the decoder when seeking as the decode in progress is invalid */
 294         /* discard the block as it is just a null magic block */
 295         if( p_block->i_flags & BLOCK_FLAG_DISCONTINUITY ) {
 296             schro_decoder_reset( p_sys->p_schro );
 297
 298             p_sys->i_lastpts = VLC_TS_INVALID;
 299             block_Release( p_block );
 300             *pp_block = NULL;
 301             return NULL;
 302         }
 303
 304         SchroBuffer *p_schrobuffer;
 305         p_schrobuffer = schro_buffer_new_with_data( p_block->p_buffer, p_block->i_buffer );
 306         p_schrobuffer->free = SchroBufferFree;
 307         p_schrobuffer->priv = p_block;
 308         if( p_block->i_pts > VLC_TS_INVALID ) {
 309             mtime_t *p_pts = malloc( sizeof(*p_pts) );
 310             if( p_pts ) {
 311                 *p_pts = p_block->i_pts;
 312                 /* if this call fails, p_pts is freed automatically */
 313                 p_schrobuffer->tag = schro_tag_new( p_pts, free );
 314             }
 315         }
 316
 317         /* this stops the same block being fed back into this function if
 318          * we were on the next iteration of this loop to output a picture */
 319         *pp_block = NULL;
 320         schro_decoder_autoparse_push( p_sys->p_schro, p_schrobuffer );
 321         /* DO NOT refer to p_block after this point, it may have been freed */
 322     }
 323
 324     while( 1 )
 325     {
 326         SchroFrame *p_schroframe;
 327         picture_t *p_pic;
 328         int state = schro_decoder_autoparse_wait( p_sys->p_schro );
 329
 330         switch( state )
 331         {
 332         case SCHRO_DECODER_FIRST_ACCESS_UNIT:
 333             SetVideoFormat( p_dec );
 334             break;
 335
 336         case SCHRO_DECODER_NEED_BITS:
 337             return NULL;
 338
 339         case SCHRO_DECODER_NEED_FRAME:
 340             p_schroframe = CreateSchroFrameFromPic( p_dec );
 341
 342             if( !p_schroframe )
 343             {
 344                 msg_Err( p_dec, "Could not allocate picture for decoder");
 345                 return NULL;
 346             }
 347
 348             schro_decoder_add_output_picture( p_sys->p_schro, p_schroframe);
 349             break;
 350
 351         case SCHRO_DECODER_OK: {
 352             SchroTag *p_tag = schro_decoder_get_picture_tag( p_sys->p_schro );
 353             p_schroframe = schro_decoder_pull( p_sys->p_schro );
 354             if( !p_schroframe || !p_schroframe->priv )
 355             {
 356                 /* frame can't be one that was allocated by us
 357                  *   -- no private data: discard */
 358                 if( p_tag ) schro_tag_free( p_tag );
 359                 if( p_schroframe ) schro_frame_unref( p_schroframe );
 360                 break;
 361             }
 362             p_pic = ((struct picture_free_t*) p_schroframe->priv)->p_pic;
 363             p_schroframe->priv = NULL;
 364
 365             if( p_tag )
 366             {
 367                 /* free is handled by schro_frame_unref */
 368                 p_pic->date = *(mtime_t*) p_tag->value;
 369                 schro_tag_free( p_tag );
 370             }
 371             else if( p_sys->i_lastpts > VLC_TS_INVALID )
 372             {
 373                 /* NB, this shouldn't happen since the packetizer does a
 374                  * very thorough job of inventing timestamps.  The
 375                  * following is just a very rough fall back incase packetizer
 376                  * is missing. */
 377                 /* maybe it would be better to set p_pic->b_force ? */
 378                 p_pic->date = p_sys->i_lastpts + p_sys->i_frame_pts_delta;
 379             }
 380             p_sys->i_lastpts = p_pic->date;
 381
 382             schro_frame_unref( p_schroframe );
 383             return p_pic;
 384         }
 385         case SCHRO_DECODER_EOS:
 386             /* NB, the new api will not emit _EOS, it handles the reset internally */
 387             break;
 388
 389         case SCHRO_DECODER_ERROR:
 390             msg_Err( p_dec, "SCHRO_DECODER_ERROR");
 391             return NULL;
 392         }
 393     }
 394 }
 395