f8982659050b81735eb99743b38ca5d93e1829ae
[libav.git] / libavcodec / vc1.h
1 /*
2 * VC-1 and WMV3 decoder
3 * Copyright (c) 2006-2007 Konstantin Shishkov
4 * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #ifndef AVCODEC_VC1_H
24 #define AVCODEC_VC1_H
25
26 #include "avcodec.h"
27 #include "mpegvideo.h"
28
29 /** Markers used in VC-1 AP frame data */
30 //@{
31 enum VC1Code{
32 VC1_CODE_RES0 = 0x00000100,
33 VC1_CODE_ENDOFSEQ = 0x0000010A,
34 VC1_CODE_SLICE,
35 VC1_CODE_FIELD,
36 VC1_CODE_FRAME,
37 VC1_CODE_ENTRYPOINT,
38 VC1_CODE_SEQHDR,
39 };
40 //@}
41
42 #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
43
44 /** Available Profiles */
45 //@{
46 enum Profile {
47 PROFILE_SIMPLE,
48 PROFILE_MAIN,
49 PROFILE_COMPLEX, ///< TODO: WMV9 specific
50 PROFILE_ADVANCED
51 };
52 //@}
53
54 /** Sequence quantizer mode */
55 //@{
56 enum QuantMode {
57 QUANT_FRAME_IMPLICIT, ///< Implicitly specified at frame level
58 QUANT_FRAME_EXPLICIT, ///< Explicitly specified at frame level
59 QUANT_NON_UNIFORM, ///< Non-uniform quant used for all frames
60 QUANT_UNIFORM ///< Uniform quant used for all frames
61 };
62 //@}
63
64 /** Where quant can be changed */
65 //@{
66 enum DQProfile {
67 DQPROFILE_FOUR_EDGES,
68 DQPROFILE_DOUBLE_EDGES,
69 DQPROFILE_SINGLE_EDGE,
70 DQPROFILE_ALL_MBS
71 };
72 //@}
73
74 /** @name Where quant can be changed
75 */
76 //@{
77 enum DQSingleEdge {
78 DQSINGLE_BEDGE_LEFT,
79 DQSINGLE_BEDGE_TOP,
80 DQSINGLE_BEDGE_RIGHT,
81 DQSINGLE_BEDGE_BOTTOM
82 };
83 //@}
84
85 /** Which pair of edges is quantized with ALTPQUANT */
86 //@{
87 enum DQDoubleEdge {
88 DQDOUBLE_BEDGE_TOPLEFT,
89 DQDOUBLE_BEDGE_TOPRIGHT,
90 DQDOUBLE_BEDGE_BOTTOMRIGHT,
91 DQDOUBLE_BEDGE_BOTTOMLEFT
92 };
93 //@}
94
95 /** MV modes for P frames */
96 //@{
97 enum MVModes {
98 MV_PMODE_1MV_HPEL_BILIN,
99 MV_PMODE_1MV,
100 MV_PMODE_1MV_HPEL,
101 MV_PMODE_MIXED_MV,
102 MV_PMODE_INTENSITY_COMP
103 };
104 //@}
105
106 /** @name MV types for B frames */
107 //@{
108 enum BMVTypes {
109 BMV_TYPE_BACKWARD,
110 BMV_TYPE_FORWARD,
111 BMV_TYPE_INTERPOLATED
112 };
113 //@}
114
115 /** @name Block types for P/B frames */
116 //@{
117 enum TransformTypes {
118 TT_8X8,
119 TT_8X4_BOTTOM,
120 TT_8X4_TOP,
121 TT_8X4, //Both halves
122 TT_4X8_RIGHT,
123 TT_4X8_LEFT,
124 TT_4X8, //Both halves
125 TT_4X4
126 };
127 //@}
128
129 /** One more frame type */
130 #define BI_TYPE 7
131
132 enum CodingSet {
133 CS_HIGH_MOT_INTRA = 0,
134 CS_HIGH_MOT_INTER,
135 CS_LOW_MOT_INTRA,
136 CS_LOW_MOT_INTER,
137 CS_MID_RATE_INTRA,
138 CS_MID_RATE_INTER,
139 CS_HIGH_RATE_INTRA,
140 CS_HIGH_RATE_INTER
141 };
142
143 /** @name Overlap conditions for Advanced Profile */
144 //@{
145 enum COTypes {
146 CONDOVER_NONE = 0,
147 CONDOVER_ALL,
148 CONDOVER_SELECT
149 };
150 //@}
151
152
153 /** The VC1 Context
154 * @fixme Change size wherever another size is more efficient
155 * Many members are only used for Advanced Profile
156 */
157 typedef struct VC1Context{
158 MpegEncContext s;
159
160 int bits;
161
162 /** Simple/Main Profile sequence header */
163 //@{
164 int res_sm; ///< reserved, 2b
165 int res_x8; ///< reserved
166 int multires; ///< frame-level RESPIC syntax element present
167 int res_fasttx; ///< reserved, always 1
168 int res_transtab; ///< reserved, always 0
169 int rangered; ///< RANGEREDFRM (range reduction) syntax element present
170 ///< at frame level
171 int res_rtm_flag; ///< reserved, set to 1
172 int reserved; ///< reserved
173 //@}
174
175 /** Advanced Profile */
176 //@{
177 int level; ///< 3bits, for Advanced/Simple Profile, provided by TS layer
178 int chromaformat; ///< 2bits, 2=4:2:0, only defined
179 int postprocflag; ///< Per-frame processing suggestion flag present
180 int broadcast; ///< TFF/RFF present
181 int interlace; ///< Progressive/interlaced (RPTFTM syntax element)
182 int tfcntrflag; ///< TFCNTR present
183 int panscanflag; ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
184 int extended_dmv; ///< Additional extended dmv range at P/B frame-level
185 int color_prim; ///< 8bits, chroma coordinates of the color primaries
186 int transfer_char; ///< 8bits, Opto-electronic transfer characteristics
187 int matrix_coef; ///< 8bits, Color primaries->YCbCr transform matrix
188 int hrd_param_flag; ///< Presence of Hypothetical Reference
189 ///< Decoder parameters
190 int psf; ///< Progressive Segmented Frame
191 //@}
192
193 /** Sequence header data for all Profiles
194 * TODO: choose between ints, uint8_ts and monobit flags
195 */
196 //@{
197 int profile; ///< 2bits, Profile
198 int frmrtq_postproc; ///< 3bits,
199 int bitrtq_postproc; ///< 5bits, quantized framerate-based postprocessing strength
200 int fastuvmc; ///< Rounding of qpel vector to hpel ? (not in Simple)
201 int extended_mv; ///< Ext MV in P/B (not in Simple)
202 int dquant; ///< How qscale varies with MBs, 2bits (not in Simple)
203 int vstransform; ///< variable-size [48]x[48] transform type + info
204 int overlap; ///< overlapped transforms in use
205 int quantizer_mode; ///< 2bits, quantizer mode used for sequence, see QUANT_*
206 int finterpflag; ///< INTERPFRM present
207 //@}
208
209 /** Frame decoding info for all profiles */
210 //@{
211 uint8_t mv_mode; ///< MV coding monde
212 uint8_t mv_mode2; ///< Secondary MV coding mode (B frames)
213 int k_x; ///< Number of bits for MVs (depends on MV range)
214 int k_y; ///< Number of bits for MVs (depends on MV range)
215 int range_x, range_y; ///< MV range
216 uint8_t pq, altpq; ///< Current/alternate frame quantizer scale
217 /** pquant parameters */
218 //@{
219 uint8_t dquantfrm;
220 uint8_t dqprofile;
221 uint8_t dqsbedge;
222 uint8_t dqbilevel;
223 //@}
224 /** AC coding set indexes
225 * @see 8.1.1.10, p(1)10
226 */
227 //@{
228 int c_ac_table_index; ///< Chroma index from ACFRM element
229 int y_ac_table_index; ///< Luma index from AC2FRM element
230 //@}
231 int ttfrm; ///< Transform type info present at frame level
232 uint8_t ttmbf; ///< Transform type flag
233 uint8_t ttblk4x4; ///< Value of ttblk which indicates a 4x4 transform
234 int codingset; ///< index of current table set from 11.8 to use for luma block decoding
235 int codingset2; ///< index of current table set from 11.8 to use for chroma block decoding
236 int pqindex; ///< raw pqindex used in coding set selection
237 int a_avail, c_avail;
238 uint8_t *mb_type_base, *mb_type[3];
239
240
241 /** Luma compensation parameters */
242 //@{
243 uint8_t lumscale;
244 uint8_t lumshift;
245 //@}
246 int16_t bfraction; ///< Relative position % anchors=> how to scale MVs
247 uint8_t halfpq; ///< Uniform quant over image and qp+.5
248 uint8_t respic; ///< Frame-level flag for resized images
249 int buffer_fullness; ///< HRD info
250 /** Ranges:
251 * -# 0 -> [-64n 63.f] x [-32, 31.f]
252 * -# 1 -> [-128, 127.f] x [-64, 63.f]
253 * -# 2 -> [-512, 511.f] x [-128, 127.f]
254 * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
255 */
256 uint8_t mvrange;
257 uint8_t pquantizer; ///< Uniform (over sequence) quantizer in use
258 VLC *cbpcy_vlc; ///< CBPCY VLC table
259 int tt_index; ///< Index for Transform Type tables
260 uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV)
261 uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs
262 int mv_type_is_raw; ///< mv type mb plane is not coded
263 int dmb_is_raw; ///< direct mb plane is raw
264 int skip_is_raw; ///< skip mb plane is not coded
265 uint8_t luty[256], lutuv[256]; // lookup tables used for intensity compensation
266 int use_ic; ///< use intensity compensation in B-frames
267 int rnd; ///< rounding control
268
269 /** Frame decoding info for S/M profiles only */
270 //@{
271 uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
272 uint8_t interpfrm;
273 //@}
274
275 /** Frame decoding info for Advanced profile */
276 //@{
277 uint8_t fcm; ///< 0->Progressive, 2->Frame-Interlace, 3->Field-Interlace
278 uint8_t numpanscanwin;
279 uint8_t tfcntr;
280 uint8_t rptfrm, tff, rff;
281 uint16_t topleftx;
282 uint16_t toplefty;
283 uint16_t bottomrightx;
284 uint16_t bottomrighty;
285 uint8_t uvsamp;
286 uint8_t postproc;
287 int hrd_num_leaky_buckets;
288 uint8_t bit_rate_exponent;
289 uint8_t buffer_size_exponent;
290 uint8_t* acpred_plane; ///< AC prediction flags bitplane
291 int acpred_is_raw;
292 uint8_t* over_flags_plane; ///< Overflags bitplane
293 int overflg_is_raw;
294 uint8_t condover;
295 uint16_t *hrd_rate, *hrd_buffer;
296 uint8_t *hrd_fullness;
297 uint8_t range_mapy_flag;
298 uint8_t range_mapuv_flag;
299 uint8_t range_mapy;
300 uint8_t range_mapuv;
301 //@}
302
303 int p_frame_skipped;
304 int bi_type;
305 } VC1Context;
306
307 #endif