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 1.2 2003/02/25 21:09:34 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     mtime_t          i_previous_pts;\r
  55     mtime_t          i_current_pts;\r
  56 \r
  57     /*\r
  58      * Output properties\r
  59      */\r
  60     vout_thread_t *p_vout;\r
  61 \r
  62 } dec_thread_t;\r
  63 \r
  64 /*****************************************************************************\r
  65  * Local prototypes\r
  66  *****************************************************************************/\r
  67 static int  OpenDecoder  ( vlc_object_t * );\r
  68 static int  RunDecoder   ( decoder_fifo_t * );\r
  69 static void CloseDecoder ( dec_thread_t * );\r
  70 \r
  71 /*****************************************************************************\r
  72  * Module descriptor\r
  73  *****************************************************************************/\r
  74 vlc_module_begin();\r
  75     set_description( _("libmpeg2 decoder module") );\r
  76     set_capability( "decoder", 40 );\r
  77     set_callbacks( OpenDecoder, NULL );\r
  78     add_shortcut( "libmpeg2" );\r
  79 vlc_module_end();\r
  80 \r
  81 /*****************************************************************************\r
  82  * OpenDecoder: probe the decoder and return score\r
  83  *****************************************************************************/\r
  84 static int OpenDecoder( vlc_object_t *p_this )\r
  85 {\r
  86     decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;\r
  87 \r
  88     if( p_fifo->i_fourcc != VLC_FOURCC('m','p','g','v') )\r
  89     {\r
  90         return VLC_EGENERIC;\r
  91     }\r
  92 \r
  93     p_fifo->pf_run = RunDecoder;\r
  94     return VLC_SUCCESS;\r
  95 }\r
  96 /*****************************************************************************\r
  97  * RunDecoder: the libmpeg2 decoder\r
  98  *****************************************************************************/\r
  99 static int RunDecoder( decoder_fifo_t *p_fifo )\r
 100 {\r
 101     dec_thread_t    *p_dec;\r
 102     data_packet_t   *p_data = NULL;\r
 103     mpeg2_state_t   state;\r
 104     picture_t       *p_pic;\r
 105     int             i_aspect, i_chroma;\r
 106 \r
 107     /* Allocate the memory needed to store the thread's structure */\r
 108     if( (p_dec = (dec_thread_t *)malloc (sizeof(dec_thread_t)) )\r
 109         == NULL)\r
 110     {\r
 111         msg_Err( p_fifo, "out of memory" );\r
 112         goto error;\r
 113     }\r
 114 \r
 115     /* Initialize the thread properties */\r
 116     memset( p_dec, 0, sizeof(dec_thread_t) );\r
 117     p_dec->p_fifo     = p_fifo;\r
 118     p_dec->p_pes      = NULL;\r
 119     p_dec->p_vout     = NULL;\r
 120     p_dec->p_mpeg2dec = NULL;\r
 121     p_dec->p_info     = NULL;\r
 122     p_dec->i_pts      = 0;\r
 123     p_dec->i_current_pts  = 0;\r
 124     p_dec->i_previous_pts = 0;\r
 125 \r
 126     /* Initialize decoder */\r
 127     p_dec->p_mpeg2dec = mpeg2_init();\r
 128     if( p_dec->p_mpeg2dec == NULL)\r
 129         goto error;\r
 130 \r
 131     p_dec->p_info = mpeg2_info( p_dec->p_mpeg2dec );\r
 132 \r
 133     /* libmpeg2 decoder thread's main loop */\r
 134     while( (!p_dec->p_fifo->b_die) && (!p_dec->p_fifo->b_error) )\r
 135     {\r
 136         state = mpeg2_parse( p_dec->p_mpeg2dec );\r
 137 \r
 138         switch( state )\r
 139         {\r
 140         case STATE_BUFFER:\r
 141             /* Feed libmpeg2 a data packet at a time */\r
 142             if( p_data == NULL )\r
 143             {\r
 144                 /* Get the next PES */\r
 145                 if( p_dec->p_pes )\r
 146                     input_DeletePES( p_dec->p_fifo->p_packets_mgt,\r
 147                                      p_dec->p_pes );\r
 148 \r
 149                 input_ExtractPES( p_dec->p_fifo, &p_dec->p_pes );\r
 150                 if( !p_dec->p_pes )\r
 151                 {\r
 152                     p_dec->p_fifo->b_error = 1;\r
 153                     break;\r
 154                 }\r
 155 \r
 156                 if( p_dec->p_pes->i_pts )\r
 157                 {\r
 158                     mpeg2_pts( p_dec->p_mpeg2dec,\r
 159                                (uint32_t)p_dec->p_pes->i_pts );\r
 160                     p_dec->i_previous_pts = p_dec->i_current_pts;\r
 161                     p_dec->i_current_pts = p_dec->p_pes->i_pts;\r
 162                 }\r
 163                 p_data = p_dec->p_pes->p_first;\r
 164             }\r
 165 \r
 166             if( p_data != NULL )\r
 167             {\r
 168                 mpeg2_buffer( p_dec->p_mpeg2dec,\r
 169                               p_data->p_payload_start,\r
 170                               p_data->p_payload_end );\r
 171 \r
 172                 p_data = p_data->p_next;\r
 173             }\r
 174             break;\r
 175 \r
 176         case STATE_SEQUENCE:\r
 177             /* Initialize video output */\r
 178             i_aspect = p_dec->p_info->sequence->width *\r
 179                 p_dec->p_info->sequence->pixel_width /\r
 180                 p_dec->p_info->sequence->height * VOUT_ASPECT_FACTOR /\r
 181                 p_dec->p_info->sequence->pixel_height;\r
 182 \r
 183             i_chroma = VLC_FOURCC('Y','V','1','2');\r
 184 \r
 185             p_dec->p_vout = vout_Request( p_dec->p_fifo, p_dec->p_vout,\r
 186                                           p_dec->p_info->sequence->width,\r
 187                                           p_dec->p_info->sequence->height,\r
 188                                           i_chroma, i_aspect );\r
 189             break;\r
 190 \r
 191         case STATE_PICTURE:\r
 192           {\r
 193             uint8_t * buf[3];\r
 194 \r
 195             /* Get a new picture */\r
 196             while( !(p_pic = vout_CreatePicture( p_dec->p_vout, 0, 0, 0 ) ) )\r
 197             {\r
 198                 if( p_dec->p_fifo->b_die || p_dec->p_fifo->b_error )\r
 199                     break;\r
 200 \r
 201                 msleep( VOUT_OUTMEM_SLEEP );\r
 202             }\r
 203             if( p_pic == NULL )\r
 204                 break;\r
 205 \r
 206             buf[0] = p_pic->p[0].p_pixels;\r
 207             buf[1] = p_pic->p[1].p_pixels;\r
 208             buf[2] = p_pic->p[2].p_pixels;\r
 209             mpeg2_set_buf( p_dec->p_mpeg2dec, buf, p_pic );\r
 210           }\r
 211           break;\r
 212 \r
 213         case STATE_END:\r
 214 #if 0\r
 215             msg_Err( p_dec->p_fifo, "STATE_END" );\r
 216 #endif\r
 217         case STATE_SLICE:\r
 218 #if 0\r
 219             msg_Err( p_dec->p_fifo, "STATE_SLICE: %i",\r
 220                      p_dec->p_info->display_fbuf ?\r
 221                      p_dec->p_info->display_fbuf->id : -1 );\r
 222 #endif\r
 223             if( p_dec->p_info->display_fbuf\r
 224                 && p_dec->p_info->display_fbuf->id )\r
 225             {\r
 226                 p_pic = (picture_t *)p_dec->p_info->display_fbuf->id;\r
 227 \r
 228                 if( p_dec->p_info->display_picture->flags & PIC_FLAG_PTS )\r
 229                 {\r
 230                     p_dec->i_pts = ( p_dec->p_info->display_picture->pts ==\r
 231                                      (uint32_t)p_dec->i_current_pts ) ?\r
 232                         p_dec->i_current_pts : p_dec->i_previous_pts;\r
 233                 }\r
 234                 else\r
 235                 {\r
 236                     p_dec->i_pts += (p_dec->p_info->sequence->frame_period/27);\r
 237                 }\r
 238 \r
 239                 vout_DatePicture( p_dec->p_vout, p_pic, p_dec->i_pts );\r
 240 \r
 241                 vout_DisplayPicture( p_dec->p_vout, p_pic );\r
 242             }\r
 243             break;\r
 244 \r
 245         default:\r
 246             break;\r
 247         }\r
 248     }\r
 249 \r
 250     /* If b_error is set, the libmpeg2 decoder thread enters the error loop */\r
 251     if( p_dec->p_fifo->b_error )\r
 252     {\r
 253         DecoderError( p_dec->p_fifo );\r
 254     }\r
 255 \r
 256     /* End of the libmpeg2 decoder thread */\r
 257     CloseDecoder( p_dec );\r
 258 \r
 259     return 0;\r
 260 \r
 261  error:\r
 262     DecoderError( p_fifo );\r
 263     if( p_dec )\r
 264     {\r
 265         if( p_dec->p_fifo )\r
 266             p_dec->p_fifo->b_error = 1;\r
 267 \r
 268         /* End of the libmpeg2 decoder thread */\r
 269         CloseDecoder( p_dec );\r
 270     }\r
 271 \r
 272     return -1;\r
 273 }\r
 274 \r
 275 /*****************************************************************************\r
 276  * CloseDecoder: libmpeg2 decoder destruction\r
 277  *****************************************************************************/\r
 278 static void CloseDecoder( dec_thread_t * p_dec )\r
 279 {\r
 280     if( p_dec )\r
 281     {\r
 282         if( p_dec->p_pes )\r
 283             input_DeletePES( p_dec->p_fifo->p_packets_mgt, p_dec->p_pes );\r
 284 \r
 285         vout_Request( p_dec->p_fifo, p_dec->p_vout, 0, 0, 0, 0 );\r
 286 \r
 287         if( p_dec->p_mpeg2dec ) mpeg2_close( p_dec->p_mpeg2dec );\r
 288 \r
 289         free( p_dec );\r
 290     }\r
 291 }\r