apps/plugins/mpegplayer/mpeg2_internal.h

   1 /*
   2  * mpeg2_internal.h
   3  * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
   4  * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
   5  *
   6  * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
   7  * See http://libmpeg2.sourceforge.net/ for updates.
   8  *
   9  * mpeg2dec 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  * mpeg2dec 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  * $Id$
  24  * libmpeg2 sync history:
  25  * 2008-07-01 - CVS revision 1.89
  26  */
  27 #ifndef MPEG2_INTERNAL_H
  28 #define MPEG2_INTERNAL_H
  29
  30 #include "config.h" /* for Rockbox CPU_ #defines */
  31
  32 /* macroblock modes */
  33 #define MACROBLOCK_INTRA            1
  34 #define MACROBLOCK_PATTERN          2
  35 #define MACROBLOCK_MOTION_BACKWARD  4
  36 #define MACROBLOCK_MOTION_FORWARD   8
  37 #define MACROBLOCK_QUANT           16
  38 #define DCT_TYPE_INTERLACED        32
  39 /* motion_type */
  40 #define MOTION_TYPE_SHIFT 6
  41 #define MC_FIELD 1
  42 #define MC_FRAME 2
  43 #define MC_16X8  2
  44 #define MC_DMV   3
  45
  46 /* picture structure */
  47 #define TOP_FIELD     1
  48 #define BOTTOM_FIELD  2
  49 #define FRAME_PICTURE 3
  50
  51 /* picture coding type */
  52 #define I_TYPE 1
  53 #define P_TYPE 2
  54 #define B_TYPE 3
  55 #define D_TYPE 4
  56
  57 typedef void mpeg2_mc_fct (uint8_t *, const uint8_t *, int, int);
  58
  59 typedef struct
  60 {
  61     uint8_t * ref[2][MPEG2_COMPONENTS];
  62     uint8_t ** ref2[2];
  63     int pmv[2][2];
  64     int f_code[2];
  65 } motion_t;
  66
  67 typedef void motion_parser_t(mpeg2_decoder_t * decoder,
  68                                          motion_t * motion,
  69                                          mpeg2_mc_fct * const * table);
  70
  71 struct mpeg2_decoder_s
  72 {
  73     /* first, state that carries information from one macroblock to the */
  74     /* next inside a slice, and is never used outside of mpeg2_slice() */
  75
  76     /* bit parsing stuff */
  77     uint32_t bitstream_buf;             /* current 32 bit working set */
  78     int bitstream_bits;                 /* used bits in working set */
  79     const uint8_t * bitstream_ptr;      /* buffer with stream data */
  80
  81     uint8_t * dest[MPEG2_COMPONENTS];
  82
  83     int offset;
  84     int stride;
  85     int uv_stride;
  86     int slice_stride;
  87     int slice_uv_stride;
  88     int stride_frame;
  89     unsigned int limit_x;
  90     unsigned int limit_y_16;
  91     unsigned int limit_y_8;
  92     unsigned int limit_y;
  93
  94     /* Motion vectors */
  95     /* The f_ and b_ correspond to the forward and backward motion */
  96     /* predictors */
  97     motion_t b_motion;
  98     motion_t f_motion;
  99     motion_parser_t * motion_parser[5];
 100
 101     /* predictor for DC coefficients in intra blocks */
 102     int16_t dc_dct_pred[MPEG2_COMPONENTS];
 103
 104     /* DCT coefficients */
 105     int16_t * ATTR_ALIGN(16) DCTblock;  /* put buffer separately to have it in IRAM */
 106
 107     uint8_t * picture_dest[MPEG2_COMPONENTS];
 108     void (* convert) (void * convert_id, uint8_t * const * src,
 109                               unsigned int v_offset);
 110     void * convert_id;
 111
 112     int dmv_offset;
 113     unsigned int v_offset;
 114
 115     /* now non-slice-specific information */
 116
 117     /* sequence header stuff */
 118     uint16_t * quantizer_matrix[4];
 119     uint16_t (* chroma_quantizer[2])[64];
 120     uint16_t quantizer_prescale[4][32][64];
 121
 122     /* The width and height of the picture snapped to macroblock units */
 123     int width;
 124     int height;
 125     int vertical_position_extension;
 126     int chroma_format;
 127
 128     /* picture header stuff */
 129
 130     /* what type of picture this is (I, P, B, D) */
 131     int coding_type;
 132
 133     /* picture coding extension stuff */
 134
 135     /* quantization factor for intra dc coefficients */
 136     int intra_dc_precision;
 137     /* top/bottom/both fields */
 138     int picture_structure;
 139     /* bool to indicate all predictions are frame based */
 140     int frame_pred_frame_dct;
 141     /* bool to indicate whether intra blocks have motion vectors */
 142     /* (for concealment) */
 143     int concealment_motion_vectors;
 144     /* bool to use different vlc tables */
 145     int intra_vlc_format;
 146     /* used for DMV MC */
 147     int top_field_first;
 148
 149     /* stuff derived from bitstream */
 150
 151     /* pointer to the zigzag scan we're supposed to be using */
 152     const uint8_t * scan;
 153
 154     int second_field;
 155
 156     int mpeg1;
 157 };
 158
 159 typedef struct
 160 {
 161     mpeg2_fbuf_t fbuf;
 162 } fbuf_alloc_t;
 163
 164 struct mpeg2dec_s
 165 {
 166     mpeg2_decoder_t decoder;
 167
 168     mpeg2_info_t info;
 169
 170     uint32_t shift;
 171     int is_display_initialized;
 172     mpeg2_state_t (* action) (struct mpeg2dec_s * mpeg2dec);
 173     mpeg2_state_t state;
 174     uint32_t ext_state;
 175
 176     /* allocated in init - gcc has problems allocating such big structures */
 177     uint8_t * ATTR_ALIGN(4) chunk_buffer;
 178     /* pointer to start of the current chunk */
 179     uint8_t * chunk_start;
 180     /* pointer to current position in chunk_buffer */
 181     uint8_t * chunk_ptr;
 182     /* last start code ? */
 183     uint8_t code;
 184
 185     /* picture tags */
 186     uint32_t tag_current, tag2_current, tag_previous, tag2_previous;
 187     int num_tags;
 188     int bytes_since_tag;
 189
 190     int first;
 191     int alloc_index_user;
 192     int alloc_index;
 193     uint8_t first_decode_slice;
 194     uint8_t nb_decode_slices;
 195
 196     unsigned int user_data_len;
 197
 198     mpeg2_sequence_t new_sequence;
 199     mpeg2_sequence_t sequence;
 200     mpeg2_gop_t new_gop;
 201     mpeg2_gop_t gop;
 202     mpeg2_picture_t new_picture;
 203     mpeg2_picture_t pictures[4];
 204     mpeg2_picture_t * picture;
 205     /*const*/ mpeg2_fbuf_t * fbuf[3];   /* 0: current fbuf, 1-2: prediction fbufs */
 206
 207     fbuf_alloc_t fbuf_alloc[3];
 208     int custom_fbuf;
 209
 210     uint8_t * yuv_buf[3][MPEG2_COMPONENTS];
 211     int yuv_index;
 212     mpeg2_convert_t * convert;
 213     void * convert_arg;
 214     unsigned int convert_id_size;
 215     int convert_stride;
 216     void (* convert_start) (void * id, const mpeg2_fbuf_t * fbuf,
 217                                         const mpeg2_picture_t * picture,
 218                                         const mpeg2_gop_t * gop);
 219
 220     uint8_t * buf_start;
 221     uint8_t * buf_end;
 222
 223     int16_t display_offset_x, display_offset_y;
 224
 225     int copy_matrix;
 226     int8_t q_scale_type, scaled[4];
 227     uint8_t quantizer_matrix[4][64];
 228     uint8_t new_quantizer_matrix[4][64];
 229 };
 230
 231 /* decode.c */
 232 mpeg2_state_t mpeg2_seek_header (mpeg2dec_t * mpeg2dec);
 233 mpeg2_state_t mpeg2_parse_header (mpeg2dec_t * mpeg2dec);
 234
 235 /* header.c */
 236 void mpeg2_header_state_init (mpeg2dec_t * mpeg2dec);
 237 void mpeg2_reset_info (mpeg2_info_t * info);
 238 int mpeg2_header_sequence (mpeg2dec_t * mpeg2dec);
 239 int mpeg2_header_gop (mpeg2dec_t * mpeg2dec);
 240 int mpeg2_header_picture (mpeg2dec_t * mpeg2dec);
 241 int mpeg2_header_extension (mpeg2dec_t * mpeg2dec);
 242 int mpeg2_header_user_data (mpeg2dec_t * mpeg2dec);
 243 void mpeg2_header_sequence_finalize (mpeg2dec_t * mpeg2dec);
 244 void mpeg2_header_gop_finalize (mpeg2dec_t * mpeg2dec);
 245 void mpeg2_header_picture_finalize (mpeg2dec_t * mpeg2dec);
 246 mpeg2_state_t mpeg2_header_slice_start (mpeg2dec_t * mpeg2dec);
 247 mpeg2_state_t mpeg2_header_end (mpeg2dec_t * mpeg2dec);
 248 void mpeg2_set_fbuf (mpeg2dec_t * mpeg2dec, int b_type);
 249
 250 /* idct.c */
 251 void mpeg2_idct_init (void);
 252 void mpeg2_idct_copy(int16_t * block, uint8_t * dest,
 253                      const int stride);
 254 void mpeg2_idct_add(const int last, int16_t * block,
 255                     uint8_t * dest, const int stride);
 256
 257 extern const uint8_t default_mpeg2_scan_norm[64];
 258 extern const uint8_t default_mpeg2_scan_alt[64];
 259 extern uint8_t mpeg2_scan_norm[64];
 260 extern uint8_t mpeg2_scan_alt[64];
 261
 262 /* motion_comp.c */
 263 void mpeg2_mc_init (void);
 264
 265 typedef struct
 266 {
 267     mpeg2_mc_fct * put [8];
 268     mpeg2_mc_fct * avg [8];
 269 } mpeg2_mc_t;
 270
 271 extern const mpeg2_mc_t mpeg2_mc;
 272
 273 #endif /* MPEG2_INTERNAL_H */
 274