aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/ivi_common.h
blob: dd060854f347c2026a15b38f5fa14baaf20cce37 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
/*
 * common functions for Indeo Video Interactive codecs (Indeo4 and Indeo5)
 *
 * Copyright (c) 2009 Maxim Poliakovski
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * This file contains structures and macros shared by both Indeo4 and
 * Indeo5 decoders.
 */

#ifndef AVCODEC_IVI_COMMON_H
#define AVCODEC_IVI_COMMON_H

#include "avcodec.h"
#include "get_bits.h"
#include <stdint.h>

#define IVI_VLC_BITS 13 ///< max number of bits of the ivi's huffman codes

/**
 *  huffman codebook descriptor
 */
typedef struct {
    int32_t     num_rows;
    uint8_t     xbits[16];
} IVIHuffDesc;

/**
 *  macroblock/block huffman table descriptor
 */
typedef struct {
    int32_t     tab_sel;    /// index of one of the predefined tables
                            /// or "7" for custom one
    VLC         *tab;       /// pointer to the table associated with tab_sel

    /// the following are used only when tab_sel == 7
    IVIHuffDesc cust_desc;  /// custom Huffman codebook descriptor
    VLC         cust_tab;   /// vlc table for custom codebook
} IVIHuffTab;

enum {
    IVI_MB_HUFF   = 0,      /// Huffman table is used for coding macroblocks
    IVI_BLK_HUFF  = 1       /// Huffman table is used for coding blocks
};

extern VLC ff_ivi_mb_vlc_tabs [8]; ///< static macroblock Huffman tables
extern VLC ff_ivi_blk_vlc_tabs[8]; ///< static block Huffman tables


/**
 *  Common scan patterns (defined in ivi_common.c)
 */
extern const uint8_t ff_ivi_vertical_scan_8x8[64];
extern const uint8_t ff_ivi_horizontal_scan_8x8[64];
extern const uint8_t ff_ivi_direct_scan_4x4[16];


/**
 *  Declare inverse transform function types
 */
typedef void (InvTransformPtr)(const int32_t *in, int16_t *out, uint32_t pitch, const uint8_t *flags);
typedef void (DCTransformPtr) (const int32_t *in, int16_t *out, uint32_t pitch, int blk_size);


/**
 *  run-value (RLE) table descriptor
 */
typedef struct {
    uint8_t     eob_sym; ///< end of block symbol
    uint8_t     esc_sym; ///< escape symbol
    uint8_t     runtab[256];
    int8_t      valtab[256];
} RVMapDesc;

extern const RVMapDesc ff_ivi_rvmap_tabs[9];


/**
 *  information for Indeo macroblock (16x16, 8x8 or 4x4)
 */
typedef struct {
    int16_t     xpos;
    int16_t     ypos;
    uint32_t    buf_offs; ///< address in the output buffer for this mb
    uint8_t     type;     ///< macroblock type: 0 - INTRA, 1 - INTER
    uint8_t     cbp;      ///< coded block pattern
    int8_t      q_delta;  ///< quant delta
    int8_t      mv_x;     ///< motion vector (x component)
    int8_t      mv_y;     ///< motion vector (y component)
} IVIMbInfo;


/**
 *  information for Indeo tile
 */
typedef struct {
    int         xpos;
    int         ypos;
    int         width;
    int         height;
    int         is_empty;  ///< = 1 if this tile doesn't contain any data
    int         data_size; ///< size of the data in bytes
    int         num_MBs;   ///< number of macroblocks in this tile
    IVIMbInfo   *mbs;      ///< array of macroblock descriptors
    IVIMbInfo   *ref_mbs;  ///< ptr to the macroblock descriptors of the reference tile
} IVITile;


/**
 *  information for Indeo wavelet band
 */
typedef struct {
    int             plane;          ///< plane number this band belongs to
    int             band_num;       ///< band number
    int             width;
    int             height;
    const uint8_t   *data_ptr;      ///< ptr to the first byte of the band data
    int             data_size;      ///< size of the band data
    int16_t         *buf;           ///< pointer to the output buffer for this band
    int16_t         *ref_buf;       ///< pointer to the reference frame buffer (for motion compensation)
    int16_t         *bufs[3];       ///< array of pointers to the band buffers
    int             pitch;          ///< pitch associated with the buffers above
    int             is_empty;       ///< = 1 if this band doesn't contain any data
    int             mb_size;        ///< macroblock size
    int             blk_size;       ///< block size
    int             is_halfpel;     ///< precision of the motion compensation: 0 - fullpel, 1 - halfpel
    int             inherit_mv;     ///< tells if motion vector is inherited from reference macroblock
    int             inherit_qdelta; ///< tells if quantiser delta is inherited from reference macroblock
    int             qdelta_present; ///< tells if Qdelta signal is present in the bitstream (Indeo5 only)
    int             quant_mat;      ///< dequant matrix index
    int             glob_quant;     ///< quant base for this band
    const uint8_t   *scan;          ///< ptr to the scan pattern

    IVIHuffTab      blk_vlc;        ///< vlc table for decoding block data

    int             num_corr;       ///< number of correction entries
    uint8_t         corr[61*2];     ///< rvmap correction pairs
    int             rvmap_sel;      ///< rvmap table selector
    RVMapDesc       *rv_map;        ///< ptr to the RLE table for this band
    int             num_tiles;      ///< number of tiles in this band
    IVITile         *tiles;         ///< array of tile descriptors
    InvTransformPtr *inv_transform;
    DCTransformPtr  *dc_transform;
    int             is_2d_trans;    ///< 1 indicates that the two-dimensional inverse transform is used
    int32_t         checksum;       ///< for debug purposes
    int             checksum_present;
    int             bufsize;        ///< band buffer size in bytes
    const uint16_t  *intra_base;    ///< quantization matrix for intra blocks
    const uint16_t  *inter_base;    ///< quantization matrix for inter blocks
    const uint8_t   *intra_scale;   ///< quantization coefficient for intra blocks
    const uint8_t   *inter_scale;   ///< quantization coefficient for inter blocks
} IVIBandDesc;


/**
 *  color plane (luma or chroma) information
 */
typedef struct {
    uint16_t    width;
    uint16_t    height;
    uint8_t     num_bands;  ///< number of bands this plane subdivided into
    IVIBandDesc *bands;     ///< array of band descriptors
} IVIPlaneDesc;


typedef struct {
    uint16_t    pic_width;
    uint16_t    pic_height;
    uint16_t    chroma_width;
    uint16_t    chroma_height;
    uint16_t    tile_width;
    uint16_t    tile_height;
    uint8_t     luma_bands;
    uint8_t     chroma_bands;
} IVIPicConfig;

/** compare some properties of two pictures */
static inline int ivi_pic_config_cmp(IVIPicConfig *str1, IVIPicConfig *str2)
{
    return str1->pic_width    != str2->pic_width    || str1->pic_height    != str2->pic_height    ||
           str1->chroma_width != str2->chroma_width || str1->chroma_height != str2->chroma_height ||
           str1->tile_width   != str2->tile_width   || str1->tile_height   != str2->tile_height   ||
           str1->luma_bands   != str2->luma_bands   || str1->chroma_bands  != str2->chroma_bands;
}

/** calculate number of tiles in a stride */
#define IVI_NUM_TILES(stride, tile_size) (((stride) + (tile_size) - 1) / (tile_size))

/** calculate number of macroblocks in a tile */
#define IVI_MBs_PER_TILE(tile_width, tile_height, mb_size) \
    ((((tile_width) + (mb_size) - 1) / (mb_size)) * (((tile_height) + (mb_size) - 1) / (mb_size)))

/** convert unsigned values into signed ones (the sign is in the LSB) */
#define IVI_TOSIGNED(val) (-(((val) >> 1) ^ -((val) & 1)))

/** scale motion vector */
static inline int ivi_scale_mv(int mv, int mv_scale)
{
    return (mv + (mv > 0) + (mv_scale - 1)) >> mv_scale;
}

/**
 *  Generate a huffman codebook from the given descriptor
 *  and convert it into the FFmpeg VLC table.
 *
 *  @param[in]   cb    pointer to codebook descriptor
 *  @param[out]  vlc   where to place the generated VLC table
 *  @param[in]   flag  flag: 1 - for static or 0 for dynamic tables
 *  @return     result code: 0 - OK, -1 = error (invalid codebook descriptor)
 */
int  ff_ivi_create_huff_from_desc(const IVIHuffDesc *cb, VLC *vlc, int flag);

/**
 * Initialize static codes used for macroblock and block decoding.
 */
void ff_ivi_init_static_vlc(void);

/**
 *  Decode a huffman codebook descriptor from the bitstream
 *  and select specified huffman table.
 *
 *  @param[in,out]  gb          the GetBit context
 *  @param[in]      desc_coded  flag signalling if table descriptor was coded
 *  @param[in]      which_tab   codebook purpose (IVI_MB_HUFF or IVI_BLK_HUFF)
 *  @param[out]     huff_tab    pointer to the descriptor of the selected table
 *  @param[in]      avctx       AVCodecContext pointer
 *  @return             zero on success, negative value otherwise
 */
int  ff_ivi_dec_huff_desc(GetBitContext *gb, int desc_coded, int which_tab,
                          IVIHuffTab *huff_tab, AVCodecContext *avctx);

/**
 *  Compare two huffman codebook descriptors.
 *
 *  @param[in]  desc1  ptr to the 1st descriptor to compare
 *  @param[in]  desc2  ptr to the 2nd descriptor to compare
 *  @return         comparison result: 0 - equal, 1 - not equal
 */
int  ff_ivi_huff_desc_cmp(const IVIHuffDesc *desc1, const IVIHuffDesc *desc2);

/**
 *  Copy huffman codebook descriptors.
 *
 *  @param[out]  dst  ptr to the destination descriptor
 *  @param[in]   src  ptr to the source descriptor
 */
void ff_ivi_huff_desc_copy(IVIHuffDesc *dst, const IVIHuffDesc *src);

/**
 *  Initialize planes (prepares descriptors, allocates buffers etc).
 *
 *  @param[in,out]  planes  pointer to the array of the plane descriptors
 *  @param[in]      cfg     pointer to the ivi_pic_config structure describing picture layout
 *  @return             result code: 0 - OK
 */
int  ff_ivi_init_planes(IVIPlaneDesc *planes, const IVIPicConfig *cfg);

/**
 *  Free planes, bands and macroblocks buffers.
 *
 *  @param[in]  planes  pointer to the array of the plane descriptors
 */
void ff_ivi_free_buffers(IVIPlaneDesc *planes);

/**
 *  Initialize tile and macroblock descriptors.
 *
 *  @param[in,out]  planes       pointer to the array of the plane descriptors
 *  @param[in]      tile_width   tile width
 *  @param[in]      tile_height  tile height
 *  @return             result code: 0 - OK
 */
int  ff_ivi_init_tiles(IVIPlaneDesc *planes, int tile_width, int tile_height);

/**
 *  Decode size of the tile data.
 *  The size is stored as a variable-length field having the following format:
 *  if (tile_data_size < 255) than this field is only one byte long
 *  if (tile_data_size >= 255) than this field four is byte long: 0xFF X1 X2 X3
 *  where X1-X3 is size of the tile data
 *
 *  @param[in,out]  gb  the GetBit context
 *  @return     size of the tile data in bytes
 */
int  ff_ivi_dec_tile_data_size(GetBitContext *gb);

/**
 *  Decode block data:
 *  extract huffman-coded transform coefficients from the bitstream,
 *  dequantize them, apply inverse transform and motion compensation
 *  in order to reconstruct the picture.
 *
 *  @param[in,out]  gb    the GetBit context
 *  @param[in]      band  pointer to the band descriptor
 *  @param[in]      tile  pointer to the tile descriptor
 *  @return     result code: 0 - OK, -1 = error (corrupted blocks data)
 */
int  ff_ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile);

/**
 *  Handle empty tiles by performing data copying and motion
 *  compensation respectively.
 *
 *  @param[in]  avctx     ptr to the AVCodecContext
 *  @param[in]  band      pointer to the band descriptor
 *  @param[in]  tile      pointer to the tile descriptor
 *  @param[in]  mv_scale  scaling factor for motion vectors
 */
void ff_ivi_process_empty_tile(AVCodecContext *avctx, IVIBandDesc *band,
                               IVITile *tile, int32_t mv_scale);

/**
 *  Convert and output the current plane.
 *  This conversion is done by adding back the bias value of 128
 *  (subtracted in the encoder) and clipping the result.
 *
 *  @param[in]   plane      pointer to the descriptor of the plane being processed
 *  @param[out]  dst        pointer to the buffer receiving converted pixels
 *  @param[in]   dst_pitch  pitch for moving to the next y line
 */
void ff_ivi_output_plane(IVIPlaneDesc *plane, uint8_t *dst, int dst_pitch);

/**
 *  Calculate band checksum from band data.
 */
uint16_t ivi_calc_band_checksum (IVIBandDesc *band);

/**
 *  Verify that band data lies in range.
 */
int ivi_check_band (IVIBandDesc *band, const uint8_t *ref, int pitch);

#endif /* AVCODEC_IVI_COMMON_H */