git.sesse.net Git - vlc/blob - modules/codec/libmpeg2.c

   1 /*****************************************************************************\r
   2  * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.\r
   3  *****************************************************************************\r
   4  * Copyright (C) 1999-2001 VideoLAN\r
   5  * $Id: libmpeg2.c,v 1.1 2003/02/25 17:15:32 gbazin Exp $\r
   6  *\r
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>\r
   8  *\r
   9  * This program is free software; you can redistribute it and/or modify\r
  10  * it under the terms of the GNU General Public License as published by\r
  11  * the Free Software Foundation; either version 2 of the License, or\r
  12  * (at your option) any later version.\r
  13  * \r
  14  * This program is distributed in the hope that it will be useful,\r
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  17  * GNU General Public License for more details.\r
  18  *\r
  19  * You should have received a copy of the GNU General Public License\r
  20  * along with this program; if not, write to the Free Software\r
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.\r
  22  *****************************************************************************/\r
  23 \r
  24 /*****************************************************************************\r
  25  * Preamble\r
  26  *****************************************************************************/\r
  27 #include <vlc/vlc.h>\r
  28 #include <vlc/vout.h>\r
  29 #include <vlc/input.h>\r
  30 #include <vlc/decoder.h>\r
  31 \r
  32 #include <stdlib.h>                                      /* malloc(), free() */\r
  33 #include <string.h>                                    /* memcpy(), memset() */\r
  34 \r
  35 #include <mpeg2dec/mpeg2.h>\r
  36 \r
  37 /*****************************************************************************\r
  38  * dec_thread_t : libmpeg2 decoder thread descriptor\r
  39  *****************************************************************************/\r
  40 typedef struct dec_thread_t\r
  41 {\r
  42     /*\r
  43      * libmpeg2 properties\r
  44      */\r
  45     mpeg2dec_t          *p_mpeg2dec;\r
  46     const mpeg2_info_t  *p_info;\r
  47 \r
  48     /*\r
  49      * Input properties\r
  50      */\r
  51     decoder_fifo_t   *p_fifo;                  /* stores the PES stream data */\r
  52     pes_packet_t     *p_pes;                  /* current PES we are decoding */\r
  53     mtime_t          i_pts;\r
  54 \r
  55     /*\r
  56      * Output properties\r
  57      */\r
  58     vout_thread_t *p_vout;\r
  59 \r
  60 } dec_thread_t;\r
  61 \r
  62 /*****************************************************************************\r
  63  * Local prototypes\r
  64  *****************************************************************************/\r
  65 static int  OpenDecoder  ( vlc_object_t * );\r
  66 static int  RunDecoder   ( decoder_fifo_t * );\r
  67 static void CloseDecoder ( dec_thread_t * );\r
  68 \r
  69 /*****************************************************************************\r
  70  * Module descriptor\r
  71  *****************************************************************************/\r
  72 vlc_module_begin();\r
  73     set_description( _("libmpeg2 decoder module") );\r
  74     set_capability( "decoder", 40 );\r
  75     set_callbacks( OpenDecoder, NULL );\r
  76     add_shortcut( "libmpeg2" );\r
  77 vlc_module_end();\r
  78 \r
  79 /*****************************************************************************\r
  80  * OpenDecoder: probe the decoder and return score\r
  81  *****************************************************************************/\r
  82 static int OpenDecoder( vlc_object_t *p_this )\r
  83 {\r
  84     decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;\r
  85 \r
  86     if( p_fifo->i_fourcc != VLC_FOURCC('m','p','g','v') )\r
  87     {\r
  88         return VLC_EGENERIC;\r
  89     }\r
  90 \r
  91     p_fifo->pf_run = RunDecoder;\r
  92     return VLC_SUCCESS;\r
  93 }\r
  94 /*****************************************************************************\r
  95  * RunDecoder: the libmpeg2 decoder\r
  96  *****************************************************************************/\r
  97 static int RunDecoder( decoder_fifo_t *p_fifo )\r
  98 {\r
  99     dec_thread_t    *p_dec;\r
 100     data_packet_t   *p_data = NULL;\r
 101     mpeg2_state_t   state;\r
 102     picture_t       *p_pic;\r
 103     int             i_aspect, i_chroma;\r
 104 \r
 105     /* Allocate the memory needed to store the thread's structure */\r
 106     if( (p_dec = (dec_thread_t *)malloc (sizeof(dec_thread_t)) )\r
 107         == NULL)\r
 108     {\r
 109         msg_Err( p_fifo, "out of memory" );\r
 110         goto error;\r
 111     }\r
 112 \r
 113     /* Initialize the thread properties */\r
 114     memset( p_dec, 0, sizeof(dec_thread_t) );\r
 115     p_dec->p_fifo     = p_fifo;\r
 116     p_dec->p_pes      = NULL;\r
 117     p_dec->p_vout     = NULL;\r
 118     p_dec->p_mpeg2dec = NULL;\r
 119     p_dec->p_info     = NULL;\r
 120     p_dec->i_pts      = 0;\r
 121 \r
 122     /* Initialize decoder */\r
 123     p_dec->p_mpeg2dec = mpeg2_init();\r
 124     if( p_dec->p_mpeg2dec == NULL)\r
 125         goto error;\r
 126 \r
 127     p_dec->p_info = mpeg2_info( p_dec->p_mpeg2dec );\r
 128 \r
 129     /* libmpeg2 decoder thread's main loop */\r
 130     while( (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error) )\r
 131     {\r
 132         state = mpeg2_parse( p_dec->p_mpeg2dec );\r
 133 \r
 134         switch( state )\r
 135         {\r
 136         case STATE_BUFFER:\r
 137             /* Feed libmpeg2 a data packet at a time */\r
 138             if( p_data == NULL )\r
 139             {\r
 140                 /* Get the next PES */\r
 141                 if( p_dec->p_pes )\r
 142                     input_DeletePES( p_dec->p_fifo->p_packets_mgt,\r
 143                                      p_dec->p_pes );\r
 144 \r
 145                 input_ExtractPES( p_dec->p_fifo, &p_dec->p_pes );\r
 146                 if( !p_dec->p_pes )\r
 147                 {\r
 148                     p_dec->p_fifo->b_error = 1;\r
 149                     break;\r
 150                 }\r
 151 \r
 152                 if( p_dec->p_pes->i_pts )\r
 153                 {\r
 154                     mpeg2_pts( p_dec->p_mpeg2dec,\r
 155                                p_dec->p_pes->i_pts * 9 / 100 );\r
 156                 }\r
 157                 p_data = p_dec->p_pes->p_first;\r
 158             }\r
 159 \r
 160             if( p_data != NULL )\r
 161             {\r
 162                 mpeg2_buffer( p_dec->p_mpeg2dec,\r
 163                               p_data->p_payload_start,\r
 164                               p_data->p_payload_end );\r
 165 \r
 166                 p_data = p_data->p_next;\r
 167             }\r
 168             break;\r
 169 \r
 170         case STATE_SEQUENCE:\r
 171             /* Initialize video output */\r
 172             i_aspect = p_dec->p_info->sequence->width *\r
 173                 p_dec->p_info->sequence->pixel_width /\r
 174                 p_dec->p_info->sequence->height * VOUT_ASPECT_FACTOR /\r
 175                 p_dec->p_info->sequence->pixel_height;\r
 176 \r
 177             i_chroma = VLC_FOURCC('Y','V','1','2');\r
 178 \r
 179             p_dec->p_vout = vout_Request( p_dec->p_fifo, p_dec->p_vout,\r
 180                                           p_dec->p_info->sequence->width,\r
 181                                           p_dec->p_info->sequence->height,\r
 182                                           i_chroma, i_aspect );\r
 183             break;\r
 184 \r
 185         case STATE_PICTURE:\r
 186           {\r
 187             uint8_t * buf[3];\r
 188 \r
 189             /* Get a new picture */\r
 190             while( !(p_pic = vout_CreatePicture( p_dec->p_vout, 0, 0, 0 ) ) )\r
 191             {\r
 192                 if( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error )\r
 193                     break;\r
 194 \r
 195                 msleep( VOUT_OUTMEM_SLEEP );\r
 196             }\r
 197             if( p_pic == NULL )\r
 198                 break;\r
 199 \r
 200             buf[0] = p_pic->p[0].p_pixels;\r
 201             buf[1] = p_pic->p[1].p_pixels;\r
 202             buf[2] = p_pic->p[2].p_pixels;\r
 203             mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic );\r
 204           }\r
 205           break;\r
 206 \r
 207         case STATE_END:\r
 208             msg_Err( p_dec->p_fifo, "STATE_END" );\r
 209         case STATE_SLICE:\r
 210 #if 0\r
 211             msg_Err( p_dec->p_fifo, "STATE_SLICE: %i",\r
 212                      p_dec->p_info->display_fbuf ?\r
 213                      p_dec->p_info->display_fbuf->id : -1 );\r
 214 #endif\r
 215             if( p_dec->p_info->display_fbuf\r
 216                 && p_dec->p_info->display_fbuf->id )\r
 217             {\r
 218                 p_pic = (picture_t *)p_dec->p_info->display_fbuf->id;\r
 219 \r
 220                 if( p_dec->p_info->display_picture->flags & PIC_FLAG_PTS )\r
 221                 {\r
 222                     p_dec->i_pts =\r
 223                         ((mtime_t)p_dec->p_info->display_picture->pts)\r
 224                         * 100 / 9;\r
 225                 }\r
 226                 else\r
 227                 {\r
 228                     p_dec->i_pts += (p_dec->p_info->sequence->frame_period/27);\r
 229                 }\r
 230 \r
 231                 vout_DatePicture( p_dec->p_vout, p_pic, p_dec->i_pts );\r
 232 \r
 233                 vout_DisplayPicture( p_dec->p_vout, p_pic );\r
 234             }\r
 235             break;\r
 236 \r
 237         default:\r
 238             break;\r
 239         }\r
 240     }\r
 241 \r
 242     /* If b_error is set, the libmpeg2 decoder thread enters the error loop */\r
 243     if( p_dec->p_fifo->b_error )\r
 244     {\r
 245         DecoderError( p_dec->p_fifo );\r
 246     }\r
 247 \r
 248     /* End of the libmpeg2 decoder thread */\r
 249     CloseDecoder( p_dec );\r
 250 \r
 251     return 0;\r
 252 \r
 253  error:\r
 254     DecoderError( p_fifo );\r
 255     if( p_dec )\r
 256     {\r
 257         if( p_dec->p_fifo )\r
 258             p_dec->p_fifo->b_error = 1;\r
 259 \r
 260         /* End of the libmpeg2 decoder thread */\r
 261         CloseDecoder( p_dec );\r
 262     }\r
 263 \r
 264     return -1;\r
 265 }\r
 266 \r
 267 /*****************************************************************************\r
 268  * CloseDecoder: libmpeg2 decoder destruction\r
 269  *****************************************************************************/\r
 270 static void CloseDecoder( dec_thread_t * p_dec )\r
 271 {\r
 272     if( p_dec )\r
 273     {\r
 274         if( p_dec->p_pes )\r
 275             input_DeletePES( p_dec->p_fifo->p_packets_mgt, p_dec->p_pes );\r
 276 \r
 277         vout_Request( p_dec->p_fifo, p_dec->p_vout, 0, 0, 0, 0 );\r
 278 \r
 279         if( p_dec->p_mpeg2dec ) mpeg2_close( p_dec->p_mpeg2dec );\r
 280 \r
 281         free( p_dec );\r
 282     }\r
 283 }\r