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_block.h>
  35
  36 #include <p64/p64.h>
  37
  38 /*****************************************************************************
  39  * decoder_sys_t : video decoder descriptor
  40  *****************************************************************************/
  41 struct decoder_sys_t
  42 {
  43     /*
  44      * Common properties
  45      */
  46     mtime_t i_pts;
  47     IntraP64Decoder *p_decoder;
  48     bool b_inited;
  49     int i_counter;
  50
  51 };
  52
  53 /****************************************************************************
  54  * Local prototypes
  55  ****************************************************************************/
  56 static int  OpenDecoder   ( vlc_object_t * );
  57 static void CloseDecoder  ( vlc_object_t * );
  58
  59 static void *DecodeBlock  ( decoder_t *, block_t ** );
  60
  61 #if 0
  62 static picture_t *DecodeFrame( decoder_t *, block_t * );
  63 static block_t   *SendFrame  ( decoder_t *, block_t * );
  64 #endif
  65
  66 /*****************************************************************************
  67  * Module descriptor
  68  *****************************************************************************/
  69 vlc_module_begin ()
  70     set_description( N_("Video decoder using openmash") )
  71     set_capability( "decoder", 50 )
  72     set_category( CAT_INPUT )
  73     set_subcategory( SUBCAT_INPUT_VCODEC )
  74     set_callbacks( OpenDecoder, CloseDecoder )
  75 vlc_module_end ()
  76
  77 /*****************************************************************************
  78  * OpenDecoder: probe the decoder and return score
  79  *****************************************************************************/
  80 static int OpenDecoder( vlc_object_t *p_this )
  81 {
  82     decoder_t *p_dec = (decoder_t*)p_this;
  83     decoder_sys_t *p_sys;
  84
  85     switch( p_dec->fmt_in.i_codec )
  86     {
  87         /* Planar YUV */
  88         case VLC_CODEC_H261:
  89             break;
  90
  91         default:
  92             return VLC_EGENERIC;
  93     }
  94
  95     /* Allocate the memory needed to store the decoder's structure */
  96     if( ( p_dec->p_sys = p_sys =
  97           (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
  98         return VLC_ENOMEM;
  99     /* Misc init */
 100     p_sys->i_pts = VLC_TS_INVALID;
 101     p_sys->b_inited = false;
 102     p_sys->i_counter = 0;
 103
 104     /* Set output properties */
 105     p_dec->fmt_out.i_cat = VIDEO_ES;
 106     p_dec->fmt_out.i_codec = VLC_CODEC_I420;
 107
 108     /* Set callbacks */
 109     p_dec->pf_decode_video = (picture_t *(*)(decoder_t *, block_t **))
 110         DecodeBlock;
 111     p_sys->p_decoder = new IntraP64Decoder();
 112 //     foo->sync();
 113
 114     return VLC_SUCCESS;
 115 }
 116
 117 /*****************************************************************************
 118  * CloseDecoder: decoder destruction
 119  *****************************************************************************/
 120 static void CloseDecoder( vlc_object_t *p_this )
 121 {
 122     decoder_t *p_dec = (decoder_t*)p_this;
 123     free( p_dec->p_sys );
 124 }
 125
 126
 127 /****************************************************************************
 128  * DecodeBlock: the whole thing
 129  ****************************************************************************
 130  * This function must be fed with complete frames.
 131  ****************************************************************************/
 132 static void *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 133 {
 134     decoder_sys_t *p_sys = p_dec->p_sys;
 135     block_t *p_block;
 136     picture_t *p_pic;
 137     uint32_t i_video_header;
 138     uint8_t *p_frame;
 139     int cc, sbit, ebit, mba, gob, quant, mvdh, mvdv;
 140     int i_width, i_height;
 141
 142     if( !pp_block || !*pp_block ) return NULL;
 143
 144     p_block = *pp_block;
 145
 146     if( p_sys->i_pts <= VLC_TS_INVALID && p_block->i_pts <= VLC_TS_INVALID &&
 147         p_block->i_dts <= VLC_TS_INVALID )
 148     {
 149         /* We've just started the stream, wait for the first PTS. */
 150         block_Release( p_block );
 151         return NULL;
 152     }
 153
 154
 155     /* Date management */
 156     if( p_block->i_pts > VLC_TS_INVALID )
 157         p_sys->i_pts = p_block->i_pts;
 158     else if( p_block->i_dts > VLC_TS_INVALID )
 159         p_sys->i_pts = p_block->i_dts;
 160
 161     i_video_header = *(uint32_t*)p_block->p_buffer; /* yes, it is native endian */
 162     sbit = i_video_header >> 29; /* start bit position */
 163     ebit = (i_video_header >> 26) & 7; /* end bit position */
 164     msg_Dbg( p_dec, "sbit, ebit: %d,%d", sbit, ebit );
 165     gob = (i_video_header >> 20) & 0xf; /* GOB number */
 166     if( gob > 12 )
 167     {
 168         msg_Warn( p_dec, "invalid gob, buggy vic streamer?");
 169     }
 170     mba = (i_video_header >> 15) & 0x1f; /* Macroblock address predictor */
 171     quant = (i_video_header >> 10) & 0x1f; /* quantizer */
 172     mvdh = (i_video_header >> 5) & 0x1f; /* horizontal motion vector data */
 173     mvdv = i_video_header & 0x1f; /* vertical motion vector data */
 174     cc = p_block->i_buffer - 4;
 175     msg_Dbg( p_dec, "packet size %d", cc );
 176
 177     /* Find out p_vdec->i_raw_size */
 178     p_sys->p_decoder->decode( p_block->p_buffer + 4 /*bp?*/,
 179                               cc /*cc?*/,
 180                               sbit /*sbit?*/,
 181                               ebit /*ebit?*/,
 182                               mba /* mba?*/,
 183                               gob /* gob?*/,
 184                               quant /* quant?*/,
 185                               mvdh /* mvdh?*/,
 186                               mvdv /* mvdv?*/ );
 187     i_width = p_sys->p_decoder->width();
 188     i_height = p_sys->p_decoder->height();
 189     if( !p_sys->b_inited )
 190     {
 191         msg_Dbg( p_dec, "video size is perhaps %dx%d", i_width,
 192                   i_height);
 193         video_format_Setup( &p_dec->fmt_out.video, VLC_CODEC_I420,
 194                             i_width, i_height,
 195                             1, 1 );
 196         p_sys->b_inited = true;
 197     }
 198     p_pic = NULL;
 199     p_sys->i_counter++;
 200 //    p_sys->p_decoder->sync();
 201     if( p_block->i_flags & BLOCK_FLAG_END_OF_FRAME )
 202     {
 203         p_pic = decoder_NewPicture( p_dec );
 204         if( !p_pic )
 205         {
 206             block_Release( p_block );
 207             return NULL;
 208         }
 209         p_sys->p_decoder->sync();
 210         p_sys->i_counter = 0;
 211         p_frame = p_sys->p_decoder->frame();
 212         vlc_memcpy( p_dec, p_pic->p[0].p_pixels, p_frame, i_width*i_height );
 213         p_frame += i_width * i_height;
 214         vlc_memcpy( p_dec, p_pic->p[1].p_pixels, p_frame, i_width*i_height/4 );
 215         p_frame += i_width * i_height/4;
 216         vlc_memcpy( p_dec, p_pic->p[2].p_pixels, p_frame, i_width*i_height/4 );
 217         p_pic->date = p_sys->i_pts;
 218     }
 219     block_Release( p_block);
 220     *pp_block = NULL;
 221     return p_pic;
 222 //    return NULL;
 223 }