libavcodec/ivi_common.h

   1 /*
   2  * common functions for Indeo Video Interactive codecs (Indeo4 and Indeo5)
   3  *
   4  * Copyright (c) 2009 Maxim Poliakovski
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * Libav is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with Libav; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file
  25  * This file contains structures and macros shared by both Indeo4 and
  26  * Indeo5 decoders.
  27  */
  28
  29 #ifndef AVCODEC_IVI_COMMON_H
  30 #define AVCODEC_IVI_COMMON_H
  31
  32 #include "avcodec.h"
  33 #include "get_bits.h"
  34 #include <stdint.h>
  35
  36 #define IVI_VLC_BITS 13 ///< max number of bits of the ivi's huffman codes
  37 #define IVI4_STREAM_ANALYSER    0
  38 #define IVI5_IS_PROTECTED       0x20
  39
  40 /**
  41  *  huffman codebook descriptor
  42  */
  43 typedef struct IVIHuffDesc {
  44     int32_t     num_rows;
  45     uint8_t     xbits[16];
  46 } IVIHuffDesc;
  47
  48 /**
  49  *  macroblock/block huffman table descriptor
  50  */
  51 typedef struct IVIHuffTab {
  52     int32_t     tab_sel;    /// index of one of the predefined tables
  53                             /// or "7" for custom one
  54     VLC         *tab;       /// pointer to the table associated with tab_sel
  55
  56     /// the following are used only when tab_sel == 7
  57     IVIHuffDesc cust_desc;  /// custom Huffman codebook descriptor
  58     VLC         cust_tab;   /// vlc table for custom codebook
  59 } IVIHuffTab;
  60
  61 enum {
  62     IVI_MB_HUFF   = 0,      /// Huffman table is used for coding macroblocks
  63     IVI_BLK_HUFF  = 1       /// Huffman table is used for coding blocks
  64 };
  65
  66
  67 /**
  68  *  Common scan patterns (defined in ivi_common.c)
  69  */
  70 extern const uint8_t ff_ivi_vertical_scan_8x8[64];
  71 extern const uint8_t ff_ivi_horizontal_scan_8x8[64];
  72 extern const uint8_t ff_ivi_direct_scan_4x4[16];
  73
  74
  75 /**
  76  *  Declare inverse transform function types
  77  */
  78 typedef void (InvTransformPtr)(const int32_t *in, int16_t *out, uint32_t pitch, const uint8_t *flags);
  79 typedef void (DCTransformPtr) (const int32_t *in, int16_t *out, uint32_t pitch, int blk_size);
  80
  81
  82 /**
  83  *  run-value (RLE) table descriptor
  84  */
  85 typedef struct RVMapDesc {
  86     uint8_t     eob_sym; ///< end of block symbol
  87     uint8_t     esc_sym; ///< escape symbol
  88     uint8_t     runtab[256];
  89     int8_t      valtab[256];
  90 } RVMapDesc;
  91
  92 extern const RVMapDesc ff_ivi_rvmap_tabs[9];
  93
  94
  95 /**
  96  *  information for Indeo macroblock (16x16, 8x8 or 4x4)
  97  */
  98 typedef struct IVIMbInfo {
  99     int16_t     xpos;
 100     int16_t     ypos;
 101     uint32_t    buf_offs; ///< address in the output buffer for this mb
 102     uint8_t     type;     ///< macroblock type: 0 - INTRA, 1 - INTER
 103     uint8_t     cbp;      ///< coded block pattern
 104     int8_t      q_delta;  ///< quant delta
 105     int8_t      mv_x;     ///< motion vector (x component)
 106     int8_t      mv_y;     ///< motion vector (y component)
 107 } IVIMbInfo;
 108
 109
 110 /**
 111  *  information for Indeo tile
 112  */
 113 typedef struct IVITile {
 114     int         xpos;
 115     int         ypos;
 116     int         width;
 117     int         height;
 118     int         mb_size;
 119     int         is_empty;  ///< = 1 if this tile doesn't contain any data
 120     int         data_size; ///< size of the data in bytes
 121     int         num_MBs;   ///< number of macroblocks in this tile
 122     IVIMbInfo   *mbs;      ///< array of macroblock descriptors
 123     IVIMbInfo   *ref_mbs;  ///< ptr to the macroblock descriptors of the reference tile
 124 } IVITile;
 125
 126
 127 /**
 128  *  information for Indeo wavelet band
 129  */
 130 typedef struct IVIBandDesc {
 131     int             plane;          ///< plane number this band belongs to
 132     int             band_num;       ///< band number
 133     int             width;
 134     int             height;
 135     int             aheight;        ///< aligned band height
 136     const uint8_t   *data_ptr;      ///< ptr to the first byte of the band data
 137     int             data_size;      ///< size of the band data
 138     int16_t         *buf;           ///< pointer to the output buffer for this band
 139     int16_t         *ref_buf;       ///< pointer to the reference frame buffer (for motion compensation)
 140     int16_t         *bufs[3];       ///< array of pointers to the band buffers
 141     int             pitch;          ///< pitch associated with the buffers above
 142     int             is_empty;       ///< = 1 if this band doesn't contain any data
 143     int             mb_size;        ///< macroblock size
 144     int             blk_size;       ///< block size
 145     int             is_halfpel;     ///< precision of the motion compensation: 0 - fullpel, 1 - halfpel
 146     int             inherit_mv;     ///< tells if motion vector is inherited from reference macroblock
 147     int             inherit_qdelta; ///< tells if quantiser delta is inherited from reference macroblock
 148     int             qdelta_present; ///< tells if Qdelta signal is present in the bitstream (Indeo5 only)
 149     int             quant_mat;      ///< dequant matrix index
 150     int             glob_quant;     ///< quant base for this band
 151     const uint8_t   *scan;          ///< ptr to the scan pattern
 152
 153     IVIHuffTab      blk_vlc;        ///< vlc table for decoding block data
 154
 155     int             num_corr;       ///< number of correction entries
 156     uint8_t         corr[61*2];     ///< rvmap correction pairs
 157     int             rvmap_sel;      ///< rvmap table selector
 158     RVMapDesc       *rv_map;        ///< ptr to the RLE table for this band
 159     int             num_tiles;      ///< number of tiles in this band
 160     IVITile         *tiles;         ///< array of tile descriptors
 161     InvTransformPtr *inv_transform;
 162     DCTransformPtr  *dc_transform;
 163     int             is_2d_trans;    ///< 1 indicates that the two-dimensional inverse transform is used
 164     int32_t         checksum;       ///< for debug purposes
 165     int             checksum_present;
 166     int             bufsize;        ///< band buffer size in bytes
 167     const uint16_t  *intra_base;    ///< quantization matrix for intra blocks
 168     const uint16_t  *inter_base;    ///< quantization matrix for inter blocks
 169     const uint8_t   *intra_scale;   ///< quantization coefficient for intra blocks
 170     const uint8_t   *inter_scale;   ///< quantization coefficient for inter blocks
 171 } IVIBandDesc;
 172
 173
 174 /**
 175  *  color plane (luma or chroma) information
 176  */
 177 typedef struct IVIPlaneDesc {
 178     uint16_t    width;
 179     uint16_t    height;
 180     uint8_t     num_bands;  ///< number of bands this plane subdivided into
 181     IVIBandDesc *bands;     ///< array of band descriptors
 182 } IVIPlaneDesc;
 183
 184
 185 typedef struct IVIPicConfig {
 186     uint16_t    pic_width;
 187     uint16_t    pic_height;
 188     uint16_t    chroma_width;
 189     uint16_t    chroma_height;
 190     uint16_t    tile_width;
 191     uint16_t    tile_height;
 192     uint8_t     luma_bands;
 193     uint8_t     chroma_bands;
 194 } IVIPicConfig;
 195
 196 typedef struct IVI45DecContext {
 197     GetBitContext   gb;
 198     RVMapDesc       rvmap_tabs[9];   ///< local corrected copy of the static rvmap tables
 199
 200     uint32_t        frame_num;
 201     int             frame_type;
 202     int             prev_frame_type; ///< frame type of the previous frame
 203     uint32_t        data_size;       ///< size of the frame data in bytes from picture header
 204     int             is_scalable;
 205     int             transp_status;   ///< transparency mode status: 1 - enabled
 206     const uint8_t   *frame_data;     ///< input frame data pointer
 207     int             inter_scal;      ///< signals a sequence of scalable inter frames
 208     uint32_t        frame_size;      ///< frame size in bytes
 209     uint32_t        pic_hdr_size;    ///< picture header size in bytes
 210     uint8_t         frame_flags;
 211     uint16_t        checksum;        ///< frame checksum
 212
 213     IVIPicConfig    pic_conf;
 214     IVIPlaneDesc    planes[3];       ///< color planes
 215
 216     int             buf_switch;      ///< used to switch between three buffers
 217     int             dst_buf;         ///< buffer index for the currently decoded frame
 218     int             ref_buf;         ///< inter frame reference buffer index
 219     int             ref2_buf;        ///< temporal storage for switching buffers
 220
 221     IVIHuffTab      mb_vlc;          ///< current macroblock table descriptor
 222     IVIHuffTab      blk_vlc;         ///< current block table descriptor
 223
 224     uint8_t         rvmap_sel;
 225     uint8_t         in_imf;
 226     uint8_t         in_q;            ///< flag for explicitly stored quantiser delta
 227     uint8_t         pic_glob_quant;
 228     uint8_t         unknown1;
 229
 230     uint16_t        gop_hdr_size;
 231     uint8_t         gop_flags;
 232     uint32_t        lock_word;
 233
 234 #if IVI4_STREAM_ANALYSER
 235     uint8_t         has_b_frames;
 236     uint8_t         has_transp;
 237     uint8_t         uses_tiling;
 238     uint8_t         uses_haar;
 239     uint8_t         uses_fullpel;
 240 #endif
 241
 242     int             (*decode_pic_hdr)  (struct IVI45DecContext *ctx, AVCodecContext *avctx);
 243     int             (*decode_band_hdr) (struct IVI45DecContext *ctx, IVIBandDesc *band, AVCodecContext *avctx);
 244     int             (*decode_mb_info)  (struct IVI45DecContext *ctx, IVIBandDesc *band, IVITile *tile, AVCodecContext *avctx);
 245     void            (*switch_buffers)  (struct IVI45DecContext *ctx);
 246     int             (*is_nonnull_frame)(struct IVI45DecContext *ctx);
 247
 248     int gop_invalid;
 249 } IVI45DecContext;
 250
 251 /** compare some properties of two pictures */
 252 static inline int ivi_pic_config_cmp(IVIPicConfig *str1, IVIPicConfig *str2)
 253 {
 254     return str1->pic_width    != str2->pic_width    || str1->pic_height    != str2->pic_height    ||
 255            str1->chroma_width != str2->chroma_width || str1->chroma_height != str2->chroma_height ||
 256            str1->tile_width   != str2->tile_width   || str1->tile_height   != str2->tile_height   ||
 257            str1->luma_bands   != str2->luma_bands   || str1->chroma_bands  != str2->chroma_bands;
 258 }
 259
 260 /** calculate number of tiles in a stride */
 261 #define IVI_NUM_TILES(stride, tile_size) (((stride) + (tile_size) - 1) / (tile_size))
 262
 263 /** calculate number of macroblocks in a tile */
 264 #define IVI_MBs_PER_TILE(tile_width, tile_height, mb_size) \
 265     ((((tile_width) + (mb_size) - 1) / (mb_size)) * (((tile_height) + (mb_size) - 1) / (mb_size)))
 266
 267 /** convert unsigned values into signed ones (the sign is in the LSB) */
 268 #define IVI_TOSIGNED(val) (-(((val) >> 1) ^ -((val) & 1)))
 269
 270 /** scale motion vector */
 271 static inline int ivi_scale_mv(int mv, int mv_scale)
 272 {
 273     return (mv + (mv > 0) + (mv_scale - 1)) >> mv_scale;
 274 }
 275
 276 /**
 277  * Initialize static codes used for macroblock and block decoding.
 278  */
 279 void ff_ivi_init_static_vlc(void);
 280
 281 /**
 282  *  Decode a huffman codebook descriptor from the bitstream
 283  *  and select specified huffman table.
 284  *
 285  *  @param[in,out]  gb          the GetBit context
 286  *  @param[in]      desc_coded  flag signalling if table descriptor was coded
 287  *  @param[in]      which_tab   codebook purpose (IVI_MB_HUFF or IVI_BLK_HUFF)
 288  *  @param[out]     huff_tab    pointer to the descriptor of the selected table
 289  *  @param[in]      avctx       AVCodecContext pointer
 290  *  @return             zero on success, negative value otherwise
 291  */
 292 int  ff_ivi_dec_huff_desc(GetBitContext *gb, int desc_coded, int which_tab,
 293                           IVIHuffTab *huff_tab, AVCodecContext *avctx);
 294
 295 /**
 296  *  Initialize planes (prepares descriptors, allocates buffers etc).
 297  *
 298  *  @param[in,out]  planes  pointer to the array of the plane descriptors
 299  *  @param[in]      cfg     pointer to the ivi_pic_config structure describing picture layout
 300  *  @return             result code: 0 - OK
 301  */
 302 int  ff_ivi_init_planes(IVIPlaneDesc *planes, const IVIPicConfig *cfg);
 303
 304 /**
 305  *  Initialize tile and macroblock descriptors.
 306  *
 307  *  @param[in,out]  planes       pointer to the array of the plane descriptors
 308  *  @param[in]      tile_width   tile width
 309  *  @param[in]      tile_height  tile height
 310  *  @return             result code: 0 - OK
 311  */
 312 int  ff_ivi_init_tiles(IVIPlaneDesc *planes, int tile_width, int tile_height);
 313
 314 int ff_ivi_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
 315                         AVPacket *avpkt);
 316 int ff_ivi_decode_close(AVCodecContext *avctx);
 317
 318 #endif /* AVCODEC_IVI_COMMON_H */