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 Libav.
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.
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.
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
27 #include "mpegvideo.h"
31 /** Markers used in VC-1 AP frame data */
34 VC1_CODE_RES0 = 0x00000100,
35 VC1_CODE_ENDOFSEQ = 0x0000010A,
44 #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
46 /** Available Profiles */
51 PROFILE_COMPLEX, ///< TODO: WMV9 specific
56 /** Sequence quantizer mode */
59 QUANT_FRAME_IMPLICIT, ///< Implicitly specified at frame level
60 QUANT_FRAME_EXPLICIT, ///< Explicitly specified at frame level
61 QUANT_NON_UNIFORM, ///< Non-uniform quant used for all frames
62 QUANT_UNIFORM ///< Uniform quant used for all frames
66 /** Where quant can be changed */
70 DQPROFILE_DOUBLE_EDGES,
71 DQPROFILE_SINGLE_EDGE,
76 /** @name Where quant can be changed
87 /** Which pair of edges is quantized with ALTPQUANT */
90 DQDOUBLE_BEDGE_TOPLEFT,
91 DQDOUBLE_BEDGE_TOPRIGHT,
92 DQDOUBLE_BEDGE_BOTTOMRIGHT,
93 DQDOUBLE_BEDGE_BOTTOMLEFT
97 /** MV modes for P frames */
100 MV_PMODE_1MV_HPEL_BILIN,
104 MV_PMODE_INTENSITY_COMP
108 /** MBMODE for interlaced frame P-picture */
112 MV_PMODE_INTFR_2MV_FIELD,
114 MV_PMODE_INTFR_4MV_FIELD,
116 MV_PMODE_INTFR_INTRA,
120 /** @name MV types for B frames */
125 BMV_TYPE_INTERPOLATED,
130 /** @name Block types for P/B frames */
132 enum TransformTypes {
136 TT_8X4, //Both halves
139 TT_4X8, //Both halves
145 CS_HIGH_MOT_INTRA = 0,
155 /** @name Overlap conditions for Advanced Profile */
166 * @todo Change size wherever another size is more efficient
167 * Many members are only used for Advanced Profile
169 typedef struct VC1Context{
172 VC1DSPContext vc1dsp;
176 /** Simple/Main Profile sequence header */
178 int res_sprite; ///< reserved, sprite mode
179 int res_y411; ///< reserved, old interlaced mode
180 int res_x8; ///< reserved
181 int multires; ///< frame-level RESPIC syntax element present
182 int res_fasttx; ///< reserved, always 1
183 int res_transtab; ///< reserved, always 0
184 int rangered; ///< RANGEREDFRM (range reduction) syntax element present
186 int res_rtm_flag; ///< reserved, set to 1
187 int reserved; ///< reserved
190 /** Advanced Profile */
192 int level; ///< 3bits, for Advanced/Simple Profile, provided by TS layer
193 int chromaformat; ///< 2bits, 2=4:2:0, only defined
194 int postprocflag; ///< Per-frame processing suggestion flag present
195 int broadcast; ///< TFF/RFF present
196 int interlace; ///< Progressive/interlaced (RPTFTM syntax element)
197 int tfcntrflag; ///< TFCNTR present
198 int panscanflag; ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
199 int refdist_flag; ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
200 int extended_dmv; ///< Additional extended dmv range at P/B frame-level
201 int color_prim; ///< 8bits, chroma coordinates of the color primaries
202 int transfer_char; ///< 8bits, Opto-electronic transfer characteristics
203 int matrix_coef; ///< 8bits, Color primaries->YCbCr transform matrix
204 int hrd_param_flag; ///< Presence of Hypothetical Reference
205 ///< Decoder parameters
206 int psf; ///< Progressive Segmented Frame
209 /** Sequence header data for all Profiles
210 * TODO: choose between ints, uint8_ts and monobit flags
213 int profile; ///< 2bits, Profile
214 int frmrtq_postproc; ///< 3bits,
215 int bitrtq_postproc; ///< 5bits, quantized framerate-based postprocessing strength
216 int fastuvmc; ///< Rounding of qpel vector to hpel ? (not in Simple)
217 int extended_mv; ///< Ext MV in P/B (not in Simple)
218 int dquant; ///< How qscale varies with MBs, 2bits (not in Simple)
219 int vstransform; ///< variable-size [48]x[48] transform type + info
220 int overlap; ///< overlapped transforms in use
221 int quantizer_mode; ///< 2bits, quantizer mode used for sequence, see QUANT_*
222 int finterpflag; ///< INTERPFRM present
225 /** Frame decoding info for all profiles */
227 uint8_t mv_mode; ///< MV coding monde
228 uint8_t mv_mode2; ///< Secondary MV coding mode (B frames)
229 int k_x; ///< Number of bits for MVs (depends on MV range)
230 int k_y; ///< Number of bits for MVs (depends on MV range)
231 int range_x, range_y; ///< MV range
232 uint8_t pq, altpq; ///< Current/alternate frame quantizer scale
233 uint8_t zz_8x8[4][64];///< Zigzag table for TT_8x8, permuted for IDCT
234 int left_blk_sh, top_blk_sh; ///< Either 3 or 0, positions of l/t in blk[]
235 const uint8_t* zz_8x4;///< Zigzag scan table for TT_8x4 coding mode
236 const uint8_t* zz_4x8;///< Zigzag scan table for TT_4x8 coding mode
237 /** pquant parameters */
244 /** AC coding set indexes
245 * @see 8.1.1.10, p(1)10
248 int c_ac_table_index; ///< Chroma index from ACFRM element
249 int y_ac_table_index; ///< Luma index from AC2FRM element
251 int ttfrm; ///< Transform type info present at frame level
252 uint8_t ttmbf; ///< Transform type flag
253 int *ttblk_base, *ttblk; ///< Transform type at the block level
254 int codingset; ///< index of current table set from 11.8 to use for luma block decoding
255 int codingset2; ///< index of current table set from 11.8 to use for chroma block decoding
256 int pqindex; ///< raw pqindex used in coding set selection
257 int a_avail, c_avail;
258 uint8_t *mb_type_base, *mb_type[3];
261 /** Luma compensation parameters */
266 int16_t bfraction; ///< Relative position % anchors=> how to scale MVs
267 uint8_t halfpq; ///< Uniform quant over image and qp+.5
268 uint8_t respic; ///< Frame-level flag for resized images
269 int buffer_fullness; ///< HRD info
271 * -# 0 -> [-64n 63.f] x [-32, 31.f]
272 * -# 1 -> [-128, 127.f] x [-64, 63.f]
273 * -# 2 -> [-512, 511.f] x [-128, 127.f]
274 * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
276 uint8_t mvrange; ///< Extended MV range flag
277 uint8_t pquantizer; ///< Uniform (over sequence) quantizer in use
278 VLC *cbpcy_vlc; ///< CBPCY VLC table
279 int tt_index; ///< Index for Transform Type tables (to decode TTMB)
280 uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV)
281 uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs
282 uint8_t* forward_mb_plane; ///< bitplane for "forward" MBs
283 int mv_type_is_raw; ///< mv type mb plane is not coded
284 int dmb_is_raw; ///< direct mb plane is raw
285 int fmb_is_raw; ///< forward mb plane is raw
286 int skip_is_raw; ///< skip mb plane is not coded
287 uint8_t luty[256], lutuv[256];///< lookup tables used for intensity compensation
288 int use_ic; ///< use intensity compensation in B-frames
289 int rnd; ///< rounding control
291 /** Frame decoding info for S/M profiles only */
293 uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
297 /** Frame decoding info for Advanced profile */
299 uint8_t fcm; ///< 0->Progressive, 2->Frame-Interlace, 3->Field-Interlace
300 uint8_t numpanscanwin;
302 uint8_t rptfrm, tff, rff;
305 uint16_t bottomrightx;
306 uint16_t bottomrighty;
309 int hrd_num_leaky_buckets;
310 uint8_t bit_rate_exponent;
311 uint8_t buffer_size_exponent;
312 uint8_t* acpred_plane; ///< AC prediction flags bitplane
314 uint8_t* over_flags_plane; ///< Overflags bitplane
317 uint16_t *hrd_rate, *hrd_buffer;
318 uint8_t *hrd_fullness;
319 uint8_t range_mapy_flag;
320 uint8_t range_mapuv_flag;
325 /** Frame decoding info for interlaced picture */
326 uint8_t dmvrange; ///< Extended differential MV range flag
329 uint8_t lumscale2; ///< for interlaced field P picture
331 uint8_t luty2[256], lutuv2[256]; // lookup tables used for intensity compensation
338 uint8_t* fieldtx_plane;
341 uint8_t *blk_mv_type_base, *blk_mv_type; ///< 0: frame MV, 1: field MV (interlaced frame)
342 uint8_t *mv_f_base, *mv_f[2]; ///< 0: MV obtained from same field, 1: opposite field
343 uint8_t *mv_f_last_base, *mv_f_last[2];
344 uint8_t *mv_f_next_base, *mv_f_next[2];
345 int field_mode; ///< 1 for interlaced field pictures
348 int refdist; ///< distance of the current picture from reference
349 int numref; ///< number of past field pictures used as reference
350 // 0 corresponds to 1 and 1 corresponds to 2 references
351 int reffield; ///< if numref = 0 (1 reference) then reffield decides which
352 // field to use among the two fields from previous frame
353 int intcompfield; ///< which of the two fields to be intensity compensated
354 // 0: both fields, 1: bottom field, 2: top field
355 int cur_field_type; ///< 0: top, 1: bottom
356 int ref_field_type[2]; ///< forward and backward reference field type (top or bottom)
357 int blocks_off, mb_off;
358 int qs_last; ///< if qpel has been used in the previous (tr.) picture
360 int frfd, brfd; ///< reference frame distance (forward or backward)
363 /** Frame decoding info for sprite modes */
367 AVFrame sprite_output_frame;
368 int output_width, output_height, sprite_width, sprite_height;
369 uint8_t* sr_rows[2][2]; ///< Sprite resizer line cache
376 DCTELEM (*block)[6][64];
377 int n_allocated_blks, cur_blk_idx, left_blk_idx, topleft_blk_idx, top_blk_idx;
378 uint32_t *cbp_base, *cbp;
379 uint8_t *is_intra_base, *is_intra;
380 int16_t (*luma_mv_base)[2], (*luma_mv)[2];
381 uint8_t bfraction_lut_index;///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
382 uint8_t broken_link; ///< Broken link flag (BROKEN_LINK syntax element)
383 uint8_t closed_entry; ///< Closed entry point flag (CLOSED_ENTRY syntax element)
385 int parse_only; ///< Context is used within parser
390 /** Find VC-1 marker in buffer
391 * @return position where next marker starts or end of buffer if no marker found
393 static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
395 uint32_t mrk = 0xFFFFFFFF;
397 if(end-src < 4) return end;
399 mrk = (mrk << 8) | *src++;
406 static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
411 for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;
414 for(i = 0; i < size; i++, src++) {
415 if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
416 dst[dsize++] = src[1];
426 * Decode Simple/Main Profiles sequence header
427 * @see Figure 7-8, p16-17
428 * @param avctx Codec context
429 * @param gb GetBit context initialized from Codec context extra_data
432 int vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
434 int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
436 int vc1_parse_frame_header (VC1Context *v, GetBitContext *gb);
437 int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb);
439 #endif /* AVCODEC_VC1_H */