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 "mpegvideo.h"
33 /** Markers used in VC-1 AP frame data */
36 VC1_CODE_RES0 = 0x00000100,
37 VC1_CODE_ENDOFSEQ = 0x0000010A,
46 #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
48 /** Available Profiles */
53 PROFILE_COMPLEX, ///< TODO: WMV9 specific
58 /** Sequence quantizer mode */
61 QUANT_FRAME_IMPLICIT, ///< Implicitly specified at frame level
62 QUANT_FRAME_EXPLICIT, ///< Explicitly specified at frame level
63 QUANT_NON_UNIFORM, ///< Non-uniform quant used for all frames
64 QUANT_UNIFORM ///< Uniform quant used for all frames
68 /** Where quant can be changed */
72 DQPROFILE_DOUBLE_EDGES,
73 DQPROFILE_SINGLE_EDGE,
78 /** @name Where quant can be changed
89 /** Which pair of edges is quantized with ALTPQUANT */
92 DQDOUBLE_BEDGE_TOPLEFT,
93 DQDOUBLE_BEDGE_TOPRIGHT,
94 DQDOUBLE_BEDGE_BOTTOMRIGHT,
95 DQDOUBLE_BEDGE_BOTTOMLEFT
99 /** MV modes for P frames */
102 MV_PMODE_1MV_HPEL_BILIN,
106 MV_PMODE_INTENSITY_COMP
110 /** MBMODE for interlaced frame P-picture */
114 MV_PMODE_INTFR_2MV_FIELD,
116 MV_PMODE_INTFR_4MV_FIELD,
118 MV_PMODE_INTFR_INTRA,
122 /** @name MV types for B frames */
127 BMV_TYPE_INTERPOLATED,
132 /** @name Block types for P/B frames */
134 enum TransformTypes {
138 TT_8X4, // both halves
141 TT_4X8, // both halves
147 CS_HIGH_MOT_INTRA = 0,
157 /** @name Overlap conditions for Advanced Profile */
167 * FCM Frame Coding Mode
168 * @note some content might be marked interlaced
169 * but have fcm set to 0 as well (e.g. HD-DVD)
171 enum FrameCodingMode {
172 PROGRESSIVE = 0, ///< in the bitstream is reported as 00b
173 ILACE_FRAME, ///< in the bitstream is reported as 10b
174 ILACE_FIELD ///< in the bitstream is reported as 11b
178 * @todo Change size wherever another size is more efficient
179 * Many members are only used for Advanced Profile
181 typedef struct VC1Context{
184 VC1DSPContext vc1dsp;
188 /** Simple/Main Profile sequence header */
190 int res_sprite; ///< reserved, sprite mode
191 int res_y411; ///< reserved, old interlaced mode
192 int res_x8; ///< reserved
193 int multires; ///< frame-level RESPIC syntax element present
194 int res_fasttx; ///< reserved, always 1
195 int res_transtab; ///< reserved, always 0
196 int rangered; ///< RANGEREDFRM (range reduction) syntax element present
198 int res_rtm_flag; ///< reserved, set to 1
199 int reserved; ///< reserved
202 /** Advanced Profile */
204 int level; ///< 3bits, for Advanced/Simple Profile, provided by TS layer
205 int chromaformat; ///< 2bits, 2=4:2:0, only defined
206 int postprocflag; ///< Per-frame processing suggestion flag present
207 int broadcast; ///< TFF/RFF present
208 int interlace; ///< Progressive/interlaced (RPTFTM syntax element)
209 int tfcntrflag; ///< TFCNTR present
210 int panscanflag; ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
211 int refdist_flag; ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
212 int extended_dmv; ///< Additional extended dmv range at P/B frame-level
213 int color_prim; ///< 8bits, chroma coordinates of the color primaries
214 int transfer_char; ///< 8bits, Opto-electronic transfer characteristics
215 int matrix_coef; ///< 8bits, Color primaries->YCbCr transform matrix
216 int hrd_param_flag; ///< Presence of Hypothetical Reference
217 ///< Decoder parameters
218 int psf; ///< Progressive Segmented Frame
221 /** Sequence header data for all Profiles
222 * TODO: choose between ints, uint8_ts and monobit flags
225 int profile; ///< 2bits, Profile
226 int frmrtq_postproc; ///< 3bits,
227 int bitrtq_postproc; ///< 5bits, quantized framerate-based postprocessing strength
228 int fastuvmc; ///< Rounding of qpel vector to hpel ? (not in Simple)
229 int extended_mv; ///< Ext MV in P/B (not in Simple)
230 int dquant; ///< How qscale varies with MBs, 2bits (not in Simple)
231 int vstransform; ///< variable-size [48]x[48] transform type + info
232 int overlap; ///< overlapped transforms in use
233 int quantizer_mode; ///< 2bits, quantizer mode used for sequence, see QUANT_*
234 int finterpflag; ///< INTERPFRM present
237 /** Frame decoding info for all profiles */
239 uint8_t mv_mode; ///< MV coding monde
240 uint8_t mv_mode2; ///< Secondary MV coding mode (B frames)
241 int k_x; ///< Number of bits for MVs (depends on MV range)
242 int k_y; ///< Number of bits for MVs (depends on MV range)
243 int range_x, range_y; ///< MV range
244 uint8_t pq, altpq; ///< Current/alternate frame quantizer scale
245 uint8_t zz_8x8[4][64]; ///< Zigzag table for TT_8x8, permuted for IDCT
246 int left_blk_sh, top_blk_sh; ///< Either 3 or 0, positions of l/t in blk[]
247 const uint8_t* zz_8x4; ///< Zigzag scan table for TT_8x4 coding mode
248 const uint8_t* zz_4x8; ///< Zigzag scan table for TT_4x8 coding mode
249 /** pquant parameters */
256 /** AC coding set indexes
257 * @see 8.1.1.10, p(1)10
260 int c_ac_table_index; ///< Chroma index from ACFRM element
261 int y_ac_table_index; ///< Luma index from AC2FRM element
263 int ttfrm; ///< Transform type info present at frame level
264 uint8_t ttmbf; ///< Transform type flag
265 int *ttblk_base, *ttblk; ///< Transform type at the block level
266 int codingset; ///< index of current table set from 11.8 to use for luma block decoding
267 int codingset2; ///< index of current table set from 11.8 to use for chroma block decoding
268 int pqindex; ///< raw pqindex used in coding set selection
269 int a_avail, c_avail;
270 uint8_t *mb_type_base, *mb_type[3];
273 /** Luma compensation parameters */
278 int16_t bfraction; ///< Relative position % anchors=> how to scale MVs
279 uint8_t halfpq; ///< Uniform quant over image and qp+.5
280 uint8_t respic; ///< Frame-level flag for resized images
281 int buffer_fullness; ///< HRD info
283 * -# 0 -> [-64n 63.f] x [-32, 31.f]
284 * -# 1 -> [-128, 127.f] x [-64, 63.f]
285 * -# 2 -> [-512, 511.f] x [-128, 127.f]
286 * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
288 uint8_t mvrange; ///< Extended MV range flag
289 uint8_t pquantizer; ///< Uniform (over sequence) quantizer in use
290 VLC *cbpcy_vlc; ///< CBPCY VLC table
291 int tt_index; ///< Index for Transform Type tables (to decode TTMB)
292 uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV)
293 uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs
294 uint8_t* forward_mb_plane; ///< bitplane for "forward" MBs
295 int mv_type_is_raw; ///< mv type mb plane is not coded
296 int dmb_is_raw; ///< direct mb plane is raw
297 int fmb_is_raw; ///< forward mb plane is raw
298 int skip_is_raw; ///< skip mb plane is not coded
299 uint8_t luty[256], lutuv[256]; ///< lookup tables used for intensity compensation
300 int use_ic; ///< use intensity compensation in B-frames
301 int rnd; ///< rounding control
303 /** Frame decoding info for S/M profiles only */
305 uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
309 /** Frame decoding info for Advanced profile */
311 enum FrameCodingMode fcm;
312 uint8_t numpanscanwin;
314 uint8_t rptfrm, tff, rff;
317 uint16_t bottomrightx;
318 uint16_t bottomrighty;
321 int hrd_num_leaky_buckets;
322 uint8_t bit_rate_exponent;
323 uint8_t buffer_size_exponent;
324 uint8_t* acpred_plane; ///< AC prediction flags bitplane
326 uint8_t* over_flags_plane; ///< Overflags bitplane
329 uint16_t *hrd_rate, *hrd_buffer;
330 uint8_t *hrd_fullness;
331 uint8_t range_mapy_flag;
332 uint8_t range_mapuv_flag;
337 /** Frame decoding info for interlaced picture */
338 uint8_t dmvrange; ///< Extended differential MV range flag
341 uint8_t lumscale2; ///< for interlaced field P picture
343 uint8_t luty2[256], lutuv2[256]; // lookup tables used for intensity compensation
350 uint8_t* fieldtx_plane;
353 uint8_t *blk_mv_type_base, *blk_mv_type; ///< 0: frame MV, 1: field MV (interlaced frame)
354 uint8_t *mv_f_base, *mv_f[2]; ///< 0: MV obtained from same field, 1: opposite field
355 uint8_t *mv_f_last_base, *mv_f_last[2];
356 uint8_t *mv_f_next_base, *mv_f_next[2];
357 int field_mode; ///< 1 for interlaced field pictures
360 int refdist; ///< distance of the current picture from reference
361 int numref; ///< number of past field pictures used as reference
362 // 0 corresponds to 1 and 1 corresponds to 2 references
363 int reffield; ///< if numref = 0 (1 reference) then reffield decides which
364 // field to use among the two fields from previous frame
365 int intcompfield; ///< which of the two fields to be intensity compensated
366 // 0: both fields, 1: bottom field, 2: top field
367 int cur_field_type; ///< 0: top, 1: bottom
368 int ref_field_type[2]; ///< forward and backward reference field type (top or bottom)
369 int blocks_off, mb_off;
370 int qs_last; ///< if qpel has been used in the previous (tr.) picture
372 int frfd, brfd; ///< reference frame distance (forward or backward)
375 /** Frame decoding info for sprite modes */
379 AVFrame sprite_output_frame;
380 int output_width, output_height, sprite_width, sprite_height;
381 uint8_t* sr_rows[2][2]; ///< Sprite resizer line cache
388 DCTELEM (*block)[6][64];
389 int n_allocated_blks, cur_blk_idx, left_blk_idx, topleft_blk_idx, top_blk_idx;
390 uint32_t *cbp_base, *cbp;
391 uint8_t *is_intra_base, *is_intra;
392 int16_t (*luma_mv_base)[2], (*luma_mv)[2];
393 uint8_t bfraction_lut_index; ///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
394 uint8_t broken_link; ///< Broken link flag (BROKEN_LINK syntax element)
395 uint8_t closed_entry; ///< Closed entry point flag (CLOSED_ENTRY syntax element)
397 int parse_only; ///< Context is used within parser
402 /** Find VC-1 marker in buffer
403 * @return position where next marker starts or end of buffer if no marker found
405 static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
407 uint32_t mrk = 0xFFFFFFFF;
412 mrk = (mrk << 8) | *src++;
419 static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
424 for (dsize = 0; dsize < size; dsize++)
428 for (i = 0; i < size; i++, src++) {
429 if (src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
430 dst[dsize++] = src[1];
440 * Decode Simple/Main Profiles sequence header
441 * @see Figure 7-8, p16-17
442 * @param avctx Codec context
443 * @param gb GetBit context initialized from Codec context extra_data
446 int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
448 int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
450 int ff_vc1_parse_frame_header (VC1Context *v, GetBitContext *gb);
451 int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb);
452 int ff_vc1_init_common(VC1Context *v);
454 #endif /* AVCODEC_VC1_H */