aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/vc1.h
blob: 596d4d35e53aa5632bbe58a83bfc7d18708663ba (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
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
/*
 * VC-1 and WMV3 decoder
 * Copyright (c) 2006-2007 Konstantin Shishkov
 * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
 *
 * 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
 */

#ifndef AVCODEC_VC1_H
#define AVCODEC_VC1_H

#include "avcodec.h"
#include "h264chroma.h"
#include "mpegvideo.h"
#include "intrax8.h"
#include "vc1dsp.h"

#define AC_VLC_BITS 9

/** Markers used in VC-1 AP frame data */
//@{
enum VC1Code {
    VC1_CODE_RES0       = 0x00000100,
    VC1_CODE_ENDOFSEQ   = 0x0000010A,
    VC1_CODE_SLICE,
    VC1_CODE_FIELD,
    VC1_CODE_FRAME,
    VC1_CODE_ENTRYPOINT,
    VC1_CODE_SEQHDR,
};
//@}

#define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)

/** Available Profiles */
//@{
enum Profile {
    PROFILE_SIMPLE,
    PROFILE_MAIN,
    PROFILE_COMPLEX, ///< TODO: WMV9 specific
    PROFILE_ADVANCED
};
//@}

/** Sequence quantizer mode */
//@{
enum QuantMode {
    QUANT_FRAME_IMPLICIT,    ///< Implicitly specified at frame level
    QUANT_FRAME_EXPLICIT,    ///< Explicitly specified at frame level
    QUANT_NON_UNIFORM,       ///< Non-uniform quant used for all frames
    QUANT_UNIFORM            ///< Uniform quant used for all frames
};
//@}

/** Where quant can be changed */
//@{
enum DQProfile {
    DQPROFILE_FOUR_EDGES,
    DQPROFILE_DOUBLE_EDGES,
    DQPROFILE_SINGLE_EDGE,
    DQPROFILE_ALL_MBS
};
//@}

/** @name Where quant can be changed
 */
//@{
enum DQSingleEdge {
    DQSINGLE_BEDGE_LEFT,
    DQSINGLE_BEDGE_TOP,
    DQSINGLE_BEDGE_RIGHT,
    DQSINGLE_BEDGE_BOTTOM
};
//@}

/** Which pair of edges is quantized with ALTPQUANT */
//@{
enum DQDoubleEdge {
    DQDOUBLE_BEDGE_TOPLEFT,
    DQDOUBLE_BEDGE_TOPRIGHT,
    DQDOUBLE_BEDGE_BOTTOMRIGHT,
    DQDOUBLE_BEDGE_BOTTOMLEFT
};
//@}

/** MV modes for P frames */
//@{
enum MVModes {
    MV_PMODE_1MV_HPEL_BILIN,
    MV_PMODE_1MV,
    MV_PMODE_1MV_HPEL,
    MV_PMODE_MIXED_MV,
    MV_PMODE_INTENSITY_COMP
};
//@}

/** MBMODE for interlaced frame P-picture */
//@{
enum MBModesIntfr {
    MV_PMODE_INTFR_1MV,
    MV_PMODE_INTFR_2MV_FIELD,
    MV_PMODE_INTFR_2MV,
    MV_PMODE_INTFR_4MV_FIELD,
    MV_PMODE_INTFR_4MV,
    MV_PMODE_INTFR_INTRA,
};
//@}

/** @name MV types for B frames */
//@{
enum BMVTypes {
    BMV_TYPE_BACKWARD,
    BMV_TYPE_FORWARD,
    BMV_TYPE_INTERPOLATED,
    BMV_TYPE_DIRECT
};
//@}

/** @name Block types for P/B frames */
//@{
enum TransformTypes {
    TT_8X8,
    TT_8X4_BOTTOM,
    TT_8X4_TOP,
    TT_8X4,         // both halves
    TT_4X8_RIGHT,
    TT_4X8_LEFT,
    TT_4X8,         // both halves
    TT_4X4
};
//@}

enum CodingSet {
    CS_HIGH_MOT_INTRA = 0,
    CS_HIGH_MOT_INTER,
    CS_LOW_MOT_INTRA,
    CS_LOW_MOT_INTER,
    CS_MID_RATE_INTRA,
    CS_MID_RATE_INTER,
    CS_HIGH_RATE_INTRA,
    CS_HIGH_RATE_INTER
};

/** @name Overlap conditions for Advanced Profile */
//@{
enum COTypes {
    CONDOVER_NONE = 0,
    CONDOVER_ALL,
    CONDOVER_SELECT
};
//@}

/**
 * FCM Frame Coding Mode
 * @note some content might be marked interlaced
 * but have fcm set to 0 as well (e.g. HD-DVD)
 */
enum FrameCodingMode {
    PROGRESSIVE = 0,    ///<  in the bitstream is reported as 00b
    ILACE_FRAME,        ///<  in the bitstream is reported as 10b
    ILACE_FIELD         ///<  in the bitstream is reported as 11b
};

/** The VC1 Context
 * @todo Change size wherever another size is more efficient
 * Many members are only used for Advanced Profile
 */
typedef struct VC1Context{
    MpegEncContext s;
    IntraX8Context x8;
    H264ChromaContext h264chroma;
    VC1DSPContext vc1dsp;

    int bits;

    /** Simple/Main Profile sequence header */
    //@{
    int res_sprite;       ///< reserved, sprite mode
    int res_y411;         ///< reserved, old interlaced mode
    int res_x8;           ///< reserved
    int multires;         ///< frame-level RESPIC syntax element present
    int res_fasttx;       ///< reserved, always 1
    int res_transtab;     ///< reserved, always 0
    int rangered;         ///< RANGEREDFRM (range reduction) syntax element present
                          ///< at frame level
    int res_rtm_flag;     ///< reserved, set to 1
    int reserved;         ///< reserved
    //@}

    /** Advanced Profile */
    //@{
    int level;            ///< 3bits, for Advanced/Simple Profile, provided by TS layer
    int chromaformat;     ///< 2bits, 2=4:2:0, only defined
    int postprocflag;     ///< Per-frame processing suggestion flag present
    int broadcast;        ///< TFF/RFF present
    int interlace;        ///< Progressive/interlaced (RPTFTM syntax element)
    int tfcntrflag;       ///< TFCNTR present
    int panscanflag;      ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
    int refdist_flag;     ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
    int extended_dmv;     ///< Additional extended dmv range at P/B frame-level
    int hrd_param_flag;   ///< Presence of Hypothetical Reference
                          ///< Decoder parameters
    int psf;              ///< Progressive Segmented Frame
    //@}

    /** Sequence header data for all Profiles
     * TODO: choose between ints, uint8_ts and monobit flags
     */
    //@{
    int profile;          ///< 2bits, Profile
    int frmrtq_postproc;  ///< 3bits,
    int bitrtq_postproc;  ///< 5bits, quantized framerate-based postprocessing strength
    int max_coded_width, max_coded_height;
    int fastuvmc;         ///< Rounding of qpel vector to hpel ? (not in Simple)
    int extended_mv;      ///< Ext MV in P/B (not in Simple)
    int dquant;           ///< How qscale varies with MBs, 2bits (not in Simple)
    int vstransform;      ///< variable-size [48]x[48] transform type + info
    int overlap;          ///< overlapped transforms in use
    int quantizer_mode;   ///< 2bits, quantizer mode used for sequence, see QUANT_*
    int finterpflag;      ///< INTERPFRM present
    //@}

    /** Frame decoding info for all profiles */
    //@{
    uint8_t mv_mode;             ///< MV coding monde
    uint8_t mv_mode2;            ///< Secondary MV coding mode (B frames)
    int k_x;                     ///< Number of bits for MVs (depends on MV range)
    int k_y;                     ///< Number of bits for MVs (depends on MV range)
    int range_x, range_y;        ///< MV range
    uint8_t pq, altpq;           ///< Current/alternate frame quantizer scale
    uint8_t zz_8x8[4][64];       ///< Zigzag table for TT_8x8, permuted for IDCT
    int left_blk_sh, top_blk_sh; ///< Either 3 or 0, positions of l/t in blk[]
    const uint8_t* zz_8x4;       ///< Zigzag scan table for TT_8x4 coding mode
    const uint8_t* zz_4x8;       ///< Zigzag scan table for TT_4x8 coding mode
    /** pquant parameters */
    //@{
    uint8_t dquantfrm;
    uint8_t dqprofile;
    uint8_t dqsbedge;
    uint8_t dqbilevel;
    //@}
    /** AC coding set indexes
     * @see 8.1.1.10, p(1)10
     */
    //@{
    int c_ac_table_index;    ///< Chroma index from ACFRM element
    int y_ac_table_index;    ///< Luma index from AC2FRM element
    //@}
    int ttfrm;               ///< Transform type info present at frame level
    uint8_t ttmbf;           ///< Transform type flag
    int *ttblk_base, *ttblk; ///< Transform type at the block level
    int codingset;           ///< index of current table set from 11.8 to use for luma block decoding
    int codingset2;          ///< index of current table set from 11.8 to use for chroma block decoding
    int pqindex;             ///< raw pqindex used in coding set selection
    int a_avail, c_avail;
    uint8_t *mb_type_base, *mb_type[3];


    /** Luma compensation parameters */
    //@{
    uint8_t lumscale;
    uint8_t lumshift;
    //@}
    int16_t bfraction;    ///< Relative position % anchors=> how to scale MVs
    uint8_t halfpq;       ///< Uniform quant over image and qp+.5
    uint8_t respic;       ///< Frame-level flag for resized images
    int buffer_fullness;  ///< HRD info
    /** Ranges:
     * -# 0 -> [-64n 63.f] x [-32, 31.f]
     * -# 1 -> [-128, 127.f] x [-64, 63.f]
     * -# 2 -> [-512, 511.f] x [-128, 127.f]
     * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
     */
    uint8_t mvrange;                ///< Extended MV range flag
    uint8_t pquantizer;             ///< Uniform (over sequence) quantizer in use
    VLC *cbpcy_vlc;                 ///< CBPCY VLC table
    int tt_index;                   ///< Index for Transform Type tables (to decode TTMB)
    uint8_t* mv_type_mb_plane;      ///< bitplane for mv_type == (4MV)
    uint8_t* direct_mb_plane;       ///< bitplane for "direct" MBs
    uint8_t* forward_mb_plane;      ///< bitplane for "forward" MBs
    int mv_type_is_raw;             ///< mv type mb plane is not coded
    int dmb_is_raw;                 ///< direct mb plane is raw
    int fmb_is_raw;                 ///< forward mb plane is raw
    int skip_is_raw;                ///< skip mb plane is not coded
    uint8_t luty[256], lutuv[256];  ///< lookup tables used for intensity compensation
    int use_ic;                     ///< use intensity compensation in B-frames
    int rnd;                        ///< rounding control

    /** Frame decoding info for S/M profiles only */
    //@{
    uint8_t rangeredfrm;            ///< out_sample = CLIP((in_sample-128)*2+128)
    uint8_t interpfrm;
    //@}

    /** Frame decoding info for Advanced profile */
    //@{
    enum FrameCodingMode fcm;
    uint8_t numpanscanwin;
    uint8_t tfcntr;
    uint8_t rptfrm, tff, rff;
    uint16_t topleftx;
    uint16_t toplefty;
    uint16_t bottomrightx;
    uint16_t bottomrighty;
    uint8_t uvsamp;
    uint8_t postproc;
    int hrd_num_leaky_buckets;
    uint8_t bit_rate_exponent;
    uint8_t buffer_size_exponent;
    uint8_t* acpred_plane;       ///< AC prediction flags bitplane
    int acpred_is_raw;
    uint8_t* over_flags_plane;   ///< Overflags bitplane
    int overflg_is_raw;
    uint8_t condover;
    uint16_t *hrd_rate, *hrd_buffer;
    uint8_t *hrd_fullness;
    uint8_t range_mapy_flag;
    uint8_t range_mapuv_flag;
    uint8_t range_mapy;
    uint8_t range_mapuv;
    //@}

    /** Frame decoding info for interlaced picture */
    uint8_t dmvrange;   ///< Extended differential MV range flag
    int fourmvswitch;
    int intcomp;
    uint8_t lumscale2;  ///< for interlaced field P picture
    uint8_t lumshift2;
    uint8_t luty2[256], lutuv2[256]; // lookup tables used for intensity compensation
    VLC* mbmode_vlc;
    VLC* imv_vlc;
    VLC* twomvbp_vlc;
    VLC* fourmvbp_vlc;
    uint8_t twomvbp;
    uint8_t fourmvbp;
    uint8_t* fieldtx_plane;
    int fieldtx_is_raw;
    uint8_t zzi_8x8[64];
    uint8_t *blk_mv_type_base, *blk_mv_type;    ///< 0: frame MV, 1: field MV (interlaced frame)
    uint8_t *mv_f_base, *mv_f[2];               ///< 0: MV obtained from same field, 1: opposite field
    uint8_t *mv_f_last_base, *mv_f_last[2];
    uint8_t *mv_f_next_base, *mv_f_next[2];
    int field_mode;         ///< 1 for interlaced field pictures
    int fptype;
    int second_field;
    int refdist;            ///< distance of the current picture from reference
    int numref;             ///< number of past field pictures used as reference
                            // 0 corresponds to 1 and 1 corresponds to 2 references
    int reffield;           ///< if numref = 0 (1 reference) then reffield decides which
                            // field to use among the two fields from previous frame
    int intcompfield;       ///< which of the two fields to be intensity compensated
                            // 0: both fields, 1: bottom field, 2: top field
    int cur_field_type;     ///< 0: top, 1: bottom
    int ref_field_type[2];  ///< forward and backward reference field type (top or bottom)
    int blocks_off, mb_off;
    int qs_last;            ///< if qpel has been used in the previous (tr.) picture
    int bmvtype;
    int frfd, brfd;         ///< reference frame distance (forward or backward)
    int first_pic_header_flag;
    int pic_header_flag;

    /** Frame decoding info for sprite modes */
    //@{
    int new_sprite;
    int two_sprites;
    AVFrame sprite_output_frame;
    int output_width, output_height, sprite_width, sprite_height;
    uint8_t* sr_rows[2][2];      ///< Sprite resizer line cache
    //@}

    int p_frame_skipped;
    int bi_type;
    int x8_type;

    int16_t (*block)[6][64];
    int n_allocated_blks, cur_blk_idx, left_blk_idx, topleft_blk_idx, top_blk_idx;
    uint32_t *cbp_base, *cbp;
    uint8_t *is_intra_base, *is_intra;
    int16_t (*luma_mv_base)[2], (*luma_mv)[2];
    uint8_t bfraction_lut_index; ///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
    uint8_t broken_link;         ///< Broken link flag (BROKEN_LINK syntax element)
    uint8_t closed_entry;        ///< Closed entry point flag (CLOSED_ENTRY syntax element)

    int end_mb_x;                ///< Horizontal macroblock limit (used only by mss2)

    int parse_only;              ///< Context is used within parser

    int warn_interlaced;
} VC1Context;

/** Find VC-1 marker in buffer
 * @return position where next marker starts or end of buffer if no marker found
 */
static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
{
    uint32_t mrk = 0xFFFFFFFF;

    if (end-src < 4)
        return end;
    while (src < end) {
        mrk = (mrk << 8) | *src++;
        if (IS_MARKER(mrk))
            return src - 4;
    }
    return end;
}

static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
{
    int dsize = 0, i;

    if (size < 4) {
        for (dsize = 0; dsize < size; dsize++)
            *dst++ = *src++;
        return size;
    }
    for (i = 0; i < size; i++, src++) {
        if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
            dst[dsize++] = src[1];
            src++;
            i++;
        } else
            dst[dsize++] = *src;
    }
    return dsize;
}

/**
 * Decode Simple/Main Profiles sequence header
 * @see Figure 7-8, p16-17
 * @param avctx Codec context
 * @param gb GetBit context initialized from Codec context extra_data
 * @return Status
 */
int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);

int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);

int ff_vc1_parse_frame_header    (VC1Context *v, GetBitContext *gb);
int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb);
int ff_vc1_init_common(VC1Context *v);

int  ff_vc1_decode_init_alloc_tables(VC1Context *v);
void ff_vc1_init_transposed_scantables(VC1Context *v);
int  ff_vc1_decode_end(AVCodecContext *avctx);
void ff_vc1_decode_blocks(VC1Context *v);

#endif /* AVCODEC_VC1_H */