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
6 * This file is part of FFmpeg.
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.
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.
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
27 #include "h264chroma.h"
28 #include "mpegvideo.h"
30 #include "vc1_common.h"
35 /** Sequence quantizer mode */
38 QUANT_FRAME_IMPLICIT
, ///< Implicitly specified at frame level
39 QUANT_FRAME_EXPLICIT
, ///< Explicitly specified at frame level
40 QUANT_NON_UNIFORM
, ///< Non-uniform quant used for all frames
41 QUANT_UNIFORM
///< Uniform quant used for all frames
45 /** Where quant can be changed */
49 DQPROFILE_DOUBLE_EDGES
,
50 DQPROFILE_SINGLE_EDGE
,
55 /** @name Where quant can be changed
66 /** Which pair of edges is quantized with ALTPQUANT */
69 DQDOUBLE_BEDGE_TOPLEFT
,
70 DQDOUBLE_BEDGE_TOPRIGHT
,
71 DQDOUBLE_BEDGE_BOTTOMRIGHT
,
72 DQDOUBLE_BEDGE_BOTTOMLEFT
76 /** MV modes for P frames */
79 MV_PMODE_1MV_HPEL_BILIN
,
83 MV_PMODE_INTENSITY_COMP
87 /** MBMODE for interlaced frame P-picture */
91 MV_PMODE_INTFR_2MV_FIELD
,
93 MV_PMODE_INTFR_4MV_FIELD
,
99 /** @name MV types for B frames */
104 BMV_TYPE_INTERPOLATED
,
109 /** @name Block types for P/B frames */
111 enum TransformTypes
{
115 TT_8X4
, // both halves
118 TT_4X8
, // both halves
124 CS_HIGH_MOT_INTRA
= 0,
134 /** @name Overlap conditions for Advanced Profile */
144 * FCM Frame Coding Mode
145 * @note some content might be marked interlaced
146 * but have fcm set to 0 as well (e.g. HD-DVD)
148 enum FrameCodingMode
{
149 PROGRESSIVE
= 0, ///< in the bitstream is reported as 00b
150 ILACE_FRAME
, ///< in the bitstream is reported as 10b
151 ILACE_FIELD
///< in the bitstream is reported as 11b
167 /** @} */ //imode defines
170 * @todo Change size wherever another size is more efficient
171 * Many members are only used for Advanced Profile
173 typedef struct VC1Context
{
176 H264ChromaContext h264chroma
;
177 VC1DSPContext vc1dsp
;
181 /** Simple/Main Profile sequence header */
183 int res_sprite
; ///< reserved, sprite mode
184 int res_y411
; ///< reserved, old interlaced mode
185 int res_x8
; ///< reserved
186 int multires
; ///< frame-level RESPIC syntax element present
187 int res_fasttx
; ///< reserved, always 1
188 int res_transtab
; ///< reserved, always 0
189 int rangered
; ///< RANGEREDFRM (range reduction) syntax element present
191 int res_rtm_flag
; ///< reserved, set to 1
192 int reserved
; ///< reserved
195 /** Advanced Profile */
197 int level
; ///< 3bits, for Advanced/Simple Profile, provided by TS layer
198 int chromaformat
; ///< 2bits, 2=4:2:0, only defined
199 int postprocflag
; ///< Per-frame processing suggestion flag present
200 int broadcast
; ///< TFF/RFF present
201 int interlace
; ///< Progressive/interlaced (RPTFTM syntax element)
202 int tfcntrflag
; ///< TFCNTR present
203 int panscanflag
; ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
204 int refdist_flag
; ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
205 int extended_dmv
; ///< Additional extended dmv range at P/B frame-level
206 int hrd_param_flag
; ///< Presence of Hypothetical Reference
207 ///< Decoder parameters
208 int psf
; ///< Progressive Segmented Frame
211 /** Sequence header data for all Profiles
212 * TODO: choose between ints, uint8_ts and monobit flags
215 int profile
; ///< 2bits, Profile
216 int frmrtq_postproc
; ///< 3bits,
217 int bitrtq_postproc
; ///< 5bits, quantized framerate-based postprocessing strength
218 int max_coded_width
, max_coded_height
;
219 int fastuvmc
; ///< Rounding of qpel vector to hpel ? (not in Simple)
220 int extended_mv
; ///< Ext MV in P/B (not in Simple)
221 int dquant
; ///< How qscale varies with MBs, 2bits (not in Simple)
222 int vstransform
; ///< variable-size [48]x[48] transform type + info
223 int overlap
; ///< overlapped transforms in use
224 int quantizer_mode
; ///< 2bits, quantizer mode used for sequence, see QUANT_*
225 int finterpflag
; ///< INTERPFRM present
228 /** Frame decoding info for all profiles */
230 uint8_t mv_mode
; ///< MV coding monde
231 uint8_t mv_mode2
; ///< Secondary MV coding mode (B frames)
232 int k_x
; ///< Number of bits for MVs (depends on MV range)
233 int k_y
; ///< Number of bits for MVs (depends on MV range)
234 int range_x
, range_y
; ///< MV range
235 uint8_t pq
, altpq
; ///< Current/alternate frame quantizer scale
236 uint8_t zz_8x8
[4][64]; ///< Zigzag table for TT_8x8, permuted for IDCT
237 int left_blk_sh
, top_blk_sh
; ///< Either 3 or 0, positions of l/t in blk[]
238 const uint8_t* zz_8x4
; ///< Zigzag scan table for TT_8x4 coding mode
239 const uint8_t* zz_4x8
; ///< Zigzag scan table for TT_4x8 coding mode
240 /** pquant parameters */
247 /** AC coding set indexes
248 * @see 8.1.1.10, p(1)10
251 int c_ac_table_index
; ///< Chroma index from ACFRM element
252 int y_ac_table_index
; ///< Luma index from AC2FRM element
254 int ttfrm
; ///< Transform type info present at frame level
255 uint8_t ttmbf
; ///< Transform type flag
256 int *ttblk_base
, *ttblk
; ///< Transform type at the block level
257 int codingset
; ///< index of current table set from 11.8 to use for luma block decoding
258 int codingset2
; ///< index of current table set from 11.8 to use for chroma block decoding
259 int pqindex
; ///< raw pqindex used in coding set selection
260 int a_avail
, c_avail
;
261 uint8_t *mb_type_base
, *mb_type
[3];
264 /** Luma compensation parameters */
269 int16_t bfraction
; ///< Relative position % anchors=> how to scale MVs
270 uint8_t halfpq
; ///< Uniform quant over image and qp+.5
271 uint8_t respic
; ///< Frame-level flag for resized images
272 int buffer_fullness
; ///< HRD info
274 * -# 0 -> [-64n 63.f] x [-32, 31.f]
275 * -# 1 -> [-128, 127.f] x [-64, 63.f]
276 * -# 2 -> [-512, 511.f] x [-128, 127.f]
277 * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
279 uint8_t mvrange
; ///< Extended MV range flag
280 uint8_t pquantizer
; ///< Uniform (over sequence) quantizer in use
281 VLC
*cbpcy_vlc
; ///< CBPCY VLC table
282 int tt_index
; ///< Index for Transform Type tables (to decode TTMB)
283 uint8_t* mv_type_mb_plane
; ///< bitplane for mv_type == (4MV)
284 uint8_t* direct_mb_plane
; ///< bitplane for "direct" MBs
285 uint8_t* forward_mb_plane
; ///< bitplane for "forward" MBs
286 int mv_type_is_raw
; ///< mv type mb plane is not coded
287 int dmb_is_raw
; ///< direct mb plane is raw
288 int fmb_is_raw
; ///< forward mb plane is raw
289 int skip_is_raw
; ///< skip mb plane is not coded
290 uint8_t last_luty
[2][256], last_lutuv
[2][256]; ///< lookup tables used for intensity compensation
291 uint8_t aux_luty
[2][256], aux_lutuv
[2][256]; ///< lookup tables used for intensity compensation
292 uint8_t next_luty
[2][256], next_lutuv
[2][256]; ///< lookup tables used for intensity compensation
293 uint8_t (*curr_luty
)[256] ,(*curr_lutuv
)[256];
294 int last_use_ic
, *curr_use_ic
, next_use_ic
, aux_use_ic
;
295 int rnd
; ///< rounding control
297 /** Frame decoding info for S/M profiles only */
299 uint8_t rangeredfrm
; ///< out_sample = CLIP((in_sample-128)*2+128)
303 /** Frame decoding info for Advanced profile */
305 enum FrameCodingMode fcm
;
306 uint8_t numpanscanwin
;
308 uint8_t rptfrm
, tff
, rff
;
311 uint16_t bottomrightx
;
312 uint16_t bottomrighty
;
315 int hrd_num_leaky_buckets
;
316 uint8_t bit_rate_exponent
;
317 uint8_t buffer_size_exponent
;
318 uint8_t* acpred_plane
; ///< AC prediction flags bitplane
320 uint8_t* over_flags_plane
; ///< Overflags bitplane
323 uint16_t *hrd_rate
, *hrd_buffer
;
324 uint8_t *hrd_fullness
;
325 uint8_t range_mapy_flag
;
326 uint8_t range_mapuv_flag
;
331 /** Frame decoding info for interlaced picture */
332 uint8_t dmvrange
; ///< Extended differential MV range flag
335 uint8_t lumscale2
; ///< for interlaced field P picture
343 uint8_t* fieldtx_plane
;
346 uint8_t *blk_mv_type_base
, *blk_mv_type
; ///< 0: frame MV, 1: field MV (interlaced frame)
347 uint8_t *mv_f_base
, *mv_f
[2]; ///< 0: MV obtained from same field, 1: opposite field
348 uint8_t *mv_f_next_base
, *mv_f_next
[2];
349 int field_mode
; ///< 1 for interlaced field pictures
352 int refdist
; ///< distance of the current picture from reference
353 int numref
; ///< number of past field pictures used as reference
354 // 0 corresponds to 1 and 1 corresponds to 2 references
355 int reffield
; ///< if numref = 0 (1 reference) then reffield decides which
356 // field to use among the two fields from previous frame
357 int intcompfield
; ///< which of the two fields to be intensity compensated
358 // 0: both fields, 1: bottom field, 2: top field
359 int cur_field_type
; ///< 0: top, 1: bottom
360 int ref_field_type
[2]; ///< forward and backward reference field type (top or bottom)
361 int blocks_off
, mb_off
;
362 int qs_last
; ///< if qpel has been used in the previous (tr.) picture
364 int frfd
, brfd
; ///< reference frame distance (forward or backward)
365 int first_pic_header_flag
;
368 /** Frame decoding info for sprite modes */
372 AVFrame
*sprite_output_frame
;
373 int output_width
, output_height
, sprite_width
, sprite_height
;
374 uint8_t* sr_rows
[2][2]; ///< Sprite resizer line cache
381 int16_t (*block
)[6][64];
382 int n_allocated_blks
, cur_blk_idx
, left_blk_idx
, topleft_blk_idx
, top_blk_idx
;
383 uint32_t *cbp_base
, *cbp
;
384 uint8_t *is_intra_base
, *is_intra
;
385 int16_t (*luma_mv_base
)[2], (*luma_mv
)[2];
386 uint8_t bfraction_lut_index
; ///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
387 uint8_t broken_link
; ///< Broken link flag (BROKEN_LINK syntax element)
388 uint8_t closed_entry
; ///< Closed entry point flag (CLOSED_ENTRY syntax element)
390 int end_mb_x
; ///< Horizontal macroblock limit (used only by mss2)
392 int parse_only
; ///< Context is used within parser
393 int resync_marker
; ///< could this stream contain resync markers
397 * Decode Simple/Main Profiles sequence header
398 * @see Figure 7-8, p16-17
399 * @param avctx Codec context
400 * @param gb GetBit context initialized from Codec context extra_data
403 int ff_vc1_decode_sequence_header(AVCodecContext
*avctx
, VC1Context
*v
, GetBitContext
*gb
);
405 int ff_vc1_decode_entry_point(AVCodecContext
*avctx
, VC1Context
*v
, GetBitContext
*gb
);
407 int ff_vc1_parse_frame_header (VC1Context
*v
, GetBitContext
*gb
);
408 int ff_vc1_parse_frame_header_adv(VC1Context
*v
, GetBitContext
*gb
);
409 int ff_vc1_init_common(VC1Context
*v
);
411 int ff_vc1_decode_init_alloc_tables(VC1Context
*v
);
412 void ff_vc1_init_transposed_scantables(VC1Context
*v
);
413 int ff_vc1_decode_end(AVCodecContext
*avctx
);
414 void ff_vc1_decode_blocks(VC1Context
*v
);
416 #endif /* AVCODEC_VC1_H */