modules/codec/mash.cpp

   1 /*****************************************************************************
   2  * mash.c: Video decoder using openmash codec implementations
   3  *****************************************************************************
   4  * Copyright (C) 2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Sigmund Augdal <sigmunau@idi.ntnu.no>
   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_vout.h>
  35 #include <vlc_block.h>
  36
  37 #include <p64/p64.h>
  38
  39 /*****************************************************************************
  40  * decoder_sys_t : video decoder descriptor
  41  *****************************************************************************/
  42 struct decoder_sys_t
  43 {
  44     /*
  45      * Common properties
  46      */
  47     mtime_t i_pts;
  48     IntraP64Decoder *p_decoder;
  49     bool b_inited;
  50     int i_counter;
  51
  52 };
  53
  54 /****************************************************************************
  55  * Local prototypes
  56  ****************************************************************************/
  57 static int  OpenDecoder   ( vlc_object_t * );
  58 static void CloseDecoder  ( vlc_object_t * );
  59
  60 static void *DecodeBlock  ( decoder_t *, block_t ** );
  61
  62 #if 0
  63 static picture_t *DecodeFrame( decoder_t *, block_t * );
  64 static block_t   *SendFrame  ( decoder_t *, block_t * );
  65 #endif
  66
  67 /*****************************************************************************
  68  * Module descriptor
  69  *****************************************************************************/
  70 vlc_module_begin ()
  71     set_description( N_("Video decoder using openmash") )
  72     set_capability( "decoder", 50 )
  73     set_category( CAT_INPUT )
  74     set_subcategory( SUBCAT_INPUT_VCODEC )
  75     set_callbacks( OpenDecoder, CloseDecoder )
  76 vlc_module_end ()
  77
  78 /*****************************************************************************
  79  * OpenDecoder: probe the decoder and return score
  80  *****************************************************************************/
  81 static int OpenDecoder( vlc_object_t *p_this )
  82 {
  83     decoder_t *p_dec = (decoder_t*)p_this;
  84     decoder_sys_t *p_sys;
  85
  86     switch( p_dec->fmt_in.i_codec )
  87     {
  88         /* Planar YUV */
  89         case VLC_FOURCC('h','2','6','1'):
  90         case VLC_FOURCC('H','2','6','1'):
  91             break;
  92
  93         default:
  94             return VLC_EGENERIC;
  95     }
  96
  97     /* Allocate the memory needed to store the decoder's structure */
  98     if( ( p_dec->p_sys = p_sys =
  99           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
 100         return VLC_ENOMEM;
 101     /* Misc init */
 102     p_sys->i_pts = 0;
 103     p_sys->b_inited = false;
 104     p_sys->i_counter = 0;
 105
 106     /* Set output properties */
 107     p_dec->fmt_out.i_cat = VIDEO_ES;
 108     p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
 109
 110     /* Set callbacks */
 111     p_dec->pf_decode_video = (picture_t *(*)(decoder_t *, block_t **))
 112         DecodeBlock;
 113     p_sys->p_decoder = new IntraP64Decoder();
 114 //     foo->sync();
 115
 116     return VLC_SUCCESS;
 117 }
 118
 119 /*****************************************************************************
 120  * CloseDecoder: decoder destruction
 121  *****************************************************************************/
 122 static void CloseDecoder( vlc_object_t *p_this )
 123 {
 124     decoder_t *p_dec = (decoder_t*)p_this;
 125     free( p_dec->p_sys );
 126 }
 127
 128
 129 /****************************************************************************
 130  * DecodeBlock: the whole thing
 131  ****************************************************************************
 132  * This function must be fed with complete frames.
 133  ****************************************************************************/
 134 static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 135 {
 136     decoder_sys_t *p_sys = p_dec->p_sys;
 137     block_t *p_block;
 138     picture_t *p_pic;
 139     uint32_t i_video_header;
 140     uint8_t *p_frame;
 141     int cc, sbit, ebit, mba, gob, quant, mvdh, mvdv;
 142     int i_width, i_height;
 143
 144     if( !pp_block || !*pp_block ) return NULL;
 145
 146     p_block = *pp_block;
 147
 148     if( !p_sys->i_pts && !p_block->i_pts && !p_block->i_dts )
 149     {
 150         /* We've just started the stream, wait for the first PTS. */
 151         block_Release( p_block );
 152         return NULL;
 153     }
 154
 155
 156     /* Date management */
 157     if( p_block->i_pts > 0 || p_block->i_dts > 0 )
 158     {
 159         if( p_block->i_pts > 0 ) p_sys->i_pts = p_block->i_pts;
 160         else if( p_block->i_dts > 0 ) p_sys->i_pts = p_block->i_dts;
 161     }
 162
 163     i_video_header = *(uint32_t*)p_block->p_buffer; /* yes, it is native endian */
 164     sbit = i_video_header >> 29; /* start bit position */
 165     ebit = (i_video_header >> 26) & 7; /* end bit position */
 166     msg_Dbg( p_dec, "sbit, ebit: %d,%d", sbit, ebit );
 167     gob = (i_video_header >> 20) & 0xf; /* GOB number */
 168     if( gob > 12 )
 169     {
 170         msg_Warn( p_dec, "invalid gob, buggy vic streamer?");
 171     }
 172     mba = (i_video_header >> 15) & 0x1f; /* Macroblock address predictor */
 173     quant = (i_video_header >> 10) & 0x1f; /* quantizer */
 174     mvdh = (i_video_header >> 5) & 0x1f; /* horizontal motion vector data */
 175     mvdv = i_video_header & 0x1f; /* vertical motion vector data */
 176     cc = p_block->i_buffer - 4;
 177     msg_Dbg( p_dec, "packet size %d", cc );
 178
 179     /* Find out p_vdec->i_raw_size */
 180     p_sys->p_decoder->decode( p_block->p_buffer + 4 /*bp?*/,
 181                               cc /*cc?*/,
 182                               sbit /*sbit?*/,
 183                               ebit /*ebit?*/,
 184                               mba /* mba?*/,
 185                               gob /* gob?*/,
 186                               quant /* quant?*/,
 187                               mvdh /* mvdh?*/,
 188                               mvdv /* mvdv?*/ );
 189     i_width = p_sys->p_decoder->width();
 190     i_height = p_sys->p_decoder->height();
 191     if( !p_sys->b_inited )
 192     {
 193         msg_Dbg( p_dec, "video size is perhaps %dx%d", i_width,
 194                   i_height);
 195         vout_InitFormat( &p_dec->fmt_out.video, VLC_FOURCC('I','4','2','0'),
 196                          i_width, i_height,
 197                          VOUT_ASPECT_FACTOR * i_width / i_height );
 198         p_sys->b_inited = true;
 199     }
 200     p_pic = NULL;
 201     p_sys->i_counter++;
 202 //    p_sys->p_decoder->sync();
 203     if( p_block->i_flags & BLOCK_FLAG_END_OF_FRAME )
 204     {
 205         p_pic = decoder_NewPicture( p_dec );
 206         if( !p_pic )
 207         {
 208             block_Release( p_block );
 209             return NULL;
 210         }
 211         p_sys->p_decoder->sync();
 212         p_sys->i_counter = 0;
 213         p_frame = p_sys->p_decoder->frame();
 214         vlc_memcpy( p_dec, p_pic->p[0].p_pixels, p_frame, i_width*i_height );
 215         p_frame += i_width * i_height;
 216         vlc_memcpy( p_dec, p_pic->p[1].p_pixels, p_frame, i_width*i_height/4 );
 217         p_frame += i_width * i_height/4;
 218         vlc_memcpy( p_dec, p_pic->p[2].p_pixels, p_frame, i_width*i_height/4 );
 219         p_pic->date = p_sys->i_pts;
 220     }
 221     block_Release( p_block);
 222     *pp_block = NULL;
 223     return p_pic;
 224 //    return NULL;
 225 }