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"
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 /** @name MV types for B frames */
113 BMV_TYPE_INTERPOLATED
117 /** @name Block types for P/B frames */
119 enum TransformTypes {
123 TT_8X4, //Both halves
126 TT_4X8, //Both halves
132 CS_HIGH_MOT_INTRA = 0,
142 /** @name Overlap conditions for Advanced Profile */
153 * @todo Change size wherever another size is more efficient
154 * Many members are only used for Advanced Profile
156 typedef struct VC1Context{
159 VC1DSPContext vc1dsp;
163 /** Simple/Main Profile sequence header */
165 int res_sprite; ///< reserved, sprite mode
166 int res_y411; ///< reserved, old interlaced mode
167 int res_x8; ///< reserved
168 int multires; ///< frame-level RESPIC syntax element present
169 int res_fasttx; ///< reserved, always 1
170 int res_transtab; ///< reserved, always 0
171 int rangered; ///< RANGEREDFRM (range reduction) syntax element present
173 int res_rtm_flag; ///< reserved, set to 1
174 int reserved; ///< reserved
177 /** Advanced Profile */
179 int level; ///< 3bits, for Advanced/Simple Profile, provided by TS layer
180 int chromaformat; ///< 2bits, 2=4:2:0, only defined
181 int postprocflag; ///< Per-frame processing suggestion flag present
182 int broadcast; ///< TFF/RFF present
183 int interlace; ///< Progressive/interlaced (RPTFTM syntax element)
184 int tfcntrflag; ///< TFCNTR present
185 int panscanflag; ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
186 int refdist_flag; ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
187 int extended_dmv; ///< Additional extended dmv range at P/B frame-level
188 int color_prim; ///< 8bits, chroma coordinates of the color primaries
189 int transfer_char; ///< 8bits, Opto-electronic transfer characteristics
190 int matrix_coef; ///< 8bits, Color primaries->YCbCr transform matrix
191 int hrd_param_flag; ///< Presence of Hypothetical Reference
192 ///< Decoder parameters
193 int psf; ///< Progressive Segmented Frame
196 /** Sequence header data for all Profiles
197 * TODO: choose between ints, uint8_ts and monobit flags
200 int profile; ///< 2bits, Profile
201 int frmrtq_postproc; ///< 3bits,
202 int bitrtq_postproc; ///< 5bits, quantized framerate-based postprocessing strength
203 int fastuvmc; ///< Rounding of qpel vector to hpel ? (not in Simple)
204 int extended_mv; ///< Ext MV in P/B (not in Simple)
205 int dquant; ///< How qscale varies with MBs, 2bits (not in Simple)
206 int vstransform; ///< variable-size [48]x[48] transform type + info
207 int overlap; ///< overlapped transforms in use
208 int quantizer_mode; ///< 2bits, quantizer mode used for sequence, see QUANT_*
209 int finterpflag; ///< INTERPFRM present
212 /** Frame decoding info for all profiles */
214 uint8_t mv_mode; ///< MV coding monde
215 uint8_t mv_mode2; ///< Secondary MV coding mode (B frames)
216 int k_x; ///< Number of bits for MVs (depends on MV range)
217 int k_y; ///< Number of bits for MVs (depends on MV range)
218 int range_x, range_y; ///< MV range
219 uint8_t pq, altpq; ///< Current/alternate frame quantizer scale
220 uint8_t zz_8x8[4][64];///< Zigzag table for TT_8x8, permuted for IDCT
221 const uint8_t* zz_8x4;///< Zigzag scan table for TT_8x4 coding mode
222 const uint8_t* zz_4x8;///< Zigzag scan table for TT_4x8 coding mode
223 /** pquant parameters */
230 /** AC coding set indexes
231 * @see 8.1.1.10, p(1)10
234 int c_ac_table_index; ///< Chroma index from ACFRM element
235 int y_ac_table_index; ///< Luma index from AC2FRM element
237 int ttfrm; ///< Transform type info present at frame level
238 uint8_t ttmbf; ///< Transform type flag
239 uint8_t ttblk4x4; ///< Value of ttblk which indicates a 4x4 transform
240 int codingset; ///< index of current table set from 11.8 to use for luma block decoding
241 int codingset2; ///< index of current table set from 11.8 to use for chroma block decoding
242 int pqindex; ///< raw pqindex used in coding set selection
243 int a_avail, c_avail;
244 uint8_t *mb_type_base, *mb_type[3];
247 /** Luma compensation parameters */
252 int16_t bfraction; ///< Relative position % anchors=> how to scale MVs
253 uint8_t halfpq; ///< Uniform quant over image and qp+.5
254 uint8_t respic; ///< Frame-level flag for resized images
255 int buffer_fullness; ///< HRD info
257 * -# 0 -> [-64n 63.f] x [-32, 31.f]
258 * -# 1 -> [-128, 127.f] x [-64, 63.f]
259 * -# 2 -> [-512, 511.f] x [-128, 127.f]
260 * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
263 uint8_t pquantizer; ///< Uniform (over sequence) quantizer in use
264 VLC *cbpcy_vlc; ///< CBPCY VLC table
265 int tt_index; ///< Index for Transform Type tables
266 uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV)
267 uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs
268 int mv_type_is_raw; ///< mv type mb plane is not coded
269 int dmb_is_raw; ///< direct mb plane is raw
270 int skip_is_raw; ///< skip mb plane is not coded
271 uint8_t luty[256], lutuv[256]; // lookup tables used for intensity compensation
272 int use_ic; ///< use intensity compensation in B-frames
273 int rnd; ///< rounding control
275 /** Frame decoding info for S/M profiles only */
277 uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
281 /** Frame decoding info for Advanced profile */
283 uint8_t fcm; ///< 0->Progressive, 2->Frame-Interlace, 3->Field-Interlace
284 uint8_t numpanscanwin;
286 uint8_t rptfrm, tff, rff;
289 uint16_t bottomrightx;
290 uint16_t bottomrighty;
293 int hrd_num_leaky_buckets;
294 uint8_t bit_rate_exponent;
295 uint8_t buffer_size_exponent;
296 uint8_t* acpred_plane; ///< AC prediction flags bitplane
298 uint8_t* over_flags_plane; ///< Overflags bitplane
301 uint16_t *hrd_rate, *hrd_buffer;
302 uint8_t *hrd_fullness;
303 uint8_t range_mapy_flag;
304 uint8_t range_mapuv_flag;
313 uint32_t *cbp_base, *cbp;
314 uint8_t bfraction_lut_index;///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
315 uint8_t broken_link; ///< Broken link flag (BROKEN_LINK syntax element)
316 uint8_t closed_entry; ///< Closed entry point flag (CLOSED_ENTRY syntax element)
318 int parse_only; ///< Context is used within parser
323 /** Find VC-1 marker in buffer
324 * @return position where next marker starts or end of buffer if no marker found
326 static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
328 uint32_t mrk = 0xFFFFFFFF;
330 if(end-src < 4) return end;
332 mrk = (mrk << 8) | *src++;
339 static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
344 for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;
347 for(i = 0; i < size; i++, src++) {
348 if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
349 dst[dsize++] = src[1];
359 * Decode Simple/Main Profiles sequence header
360 * @see Figure 7-8, p16-17
361 * @param avctx Codec context
362 * @param gb GetBit context initialized from Codec context extra_data
365 int vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
367 int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
369 int vc1_parse_frame_header (VC1Context *v, GetBitContext *gb);
370 int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb);
372 #endif /* AVCODEC_VC1_H */