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"
30 /** Markers used in VC-1 AP frame data */
33 VC1_CODE_RES0 = 0x00000100,
34 VC1_CODE_ENDOFSEQ = 0x0000010A,
43 #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
45 /** Available Profiles */
50 PROFILE_COMPLEX, ///< TODO: WMV9 specific
55 /** Sequence quantizer mode */
58 QUANT_FRAME_IMPLICIT, ///< Implicitly specified at frame level
59 QUANT_FRAME_EXPLICIT, ///< Explicitly specified at frame level
60 QUANT_NON_UNIFORM, ///< Non-uniform quant used for all frames
61 QUANT_UNIFORM ///< Uniform quant used for all frames
65 /** Where quant can be changed */
69 DQPROFILE_DOUBLE_EDGES,
70 DQPROFILE_SINGLE_EDGE,
75 /** @name Where quant can be changed
86 /** Which pair of edges is quantized with ALTPQUANT */
89 DQDOUBLE_BEDGE_TOPLEFT,
90 DQDOUBLE_BEDGE_TOPRIGHT,
91 DQDOUBLE_BEDGE_BOTTOMRIGHT,
92 DQDOUBLE_BEDGE_BOTTOMLEFT
96 /** MV modes for P frames */
99 MV_PMODE_1MV_HPEL_BILIN,
103 MV_PMODE_INTENSITY_COMP
107 /** @name MV types for B frames */
112 BMV_TYPE_INTERPOLATED
116 /** @name Block types for P/B frames */
118 enum TransformTypes {
122 TT_8X4, //Both halves
125 TT_4X8, //Both halves
131 CS_HIGH_MOT_INTRA = 0,
141 /** @name Overlap conditions for Advanced Profile */
152 * @todo Change size wherever another size is more efficient
153 * Many members are only used for Advanced Profile
155 typedef struct VC1Context{
161 /** Simple/Main Profile sequence header */
163 int res_sprite; ///< reserved, sprite mode
164 int res_y411; ///< reserved, old interlaced mode
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
171 int res_rtm_flag; ///< reserved, set to 1
172 int reserved; ///< reserved
175 /** Advanced Profile */
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 refdist_flag; ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
185 int extended_dmv; ///< Additional extended dmv range at P/B frame-level
186 int color_prim; ///< 8bits, chroma coordinates of the color primaries
187 int transfer_char; ///< 8bits, Opto-electronic transfer characteristics
188 int matrix_coef; ///< 8bits, Color primaries->YCbCr transform matrix
189 int hrd_param_flag; ///< Presence of Hypothetical Reference
190 ///< Decoder parameters
191 int psf; ///< Progressive Segmented Frame
194 /** Sequence header data for all Profiles
195 * TODO: choose between ints, uint8_ts and monobit flags
198 int profile; ///< 2bits, Profile
199 int frmrtq_postproc; ///< 3bits,
200 int bitrtq_postproc; ///< 5bits, quantized framerate-based postprocessing strength
201 int fastuvmc; ///< Rounding of qpel vector to hpel ? (not in Simple)
202 int extended_mv; ///< Ext MV in P/B (not in Simple)
203 int dquant; ///< How qscale varies with MBs, 2bits (not in Simple)
204 int vstransform; ///< variable-size [48]x[48] transform type + info
205 int overlap; ///< overlapped transforms in use
206 int quantizer_mode; ///< 2bits, quantizer mode used for sequence, see QUANT_*
207 int finterpflag; ///< INTERPFRM present
210 /** Frame decoding info for all profiles */
212 uint8_t mv_mode; ///< MV coding monde
213 uint8_t mv_mode2; ///< Secondary MV coding mode (B frames)
214 int k_x; ///< Number of bits for MVs (depends on MV range)
215 int k_y; ///< Number of bits for MVs (depends on MV range)
216 int range_x, range_y; ///< MV range
217 uint8_t pq, altpq; ///< Current/alternate frame quantizer scale
218 const uint8_t* zz_8x4;///< Zigzag scan table for TT_8x4 coding mode
219 const uint8_t* zz_4x8;///< Zigzag scan table for TT_4x8 coding mode
220 /** pquant parameters */
227 /** AC coding set indexes
228 * @see 8.1.1.10, p(1)10
231 int c_ac_table_index; ///< Chroma index from ACFRM element
232 int y_ac_table_index; ///< Luma index from AC2FRM element
234 int ttfrm; ///< Transform type info present at frame level
235 uint8_t ttmbf; ///< Transform type flag
236 uint8_t ttblk4x4; ///< Value of ttblk which indicates a 4x4 transform
237 int codingset; ///< index of current table set from 11.8 to use for luma block decoding
238 int codingset2; ///< index of current table set from 11.8 to use for chroma block decoding
239 int pqindex; ///< raw pqindex used in coding set selection
240 int a_avail, c_avail;
241 uint8_t *mb_type_base, *mb_type[3];
244 /** Luma compensation parameters */
249 int16_t bfraction; ///< Relative position % anchors=> how to scale MVs
250 uint8_t halfpq; ///< Uniform quant over image and qp+.5
251 uint8_t respic; ///< Frame-level flag for resized images
252 int buffer_fullness; ///< HRD info
254 * -# 0 -> [-64n 63.f] x [-32, 31.f]
255 * -# 1 -> [-128, 127.f] x [-64, 63.f]
256 * -# 2 -> [-512, 511.f] x [-128, 127.f]
257 * -# 3 -> [-1024, 1023.f] x [-256, 255.f]
260 uint8_t pquantizer; ///< Uniform (over sequence) quantizer in use
261 VLC *cbpcy_vlc; ///< CBPCY VLC table
262 int tt_index; ///< Index for Transform Type tables
263 uint8_t* mv_type_mb_plane; ///< bitplane for mv_type == (4MV)
264 uint8_t* direct_mb_plane; ///< bitplane for "direct" MBs
265 int mv_type_is_raw; ///< mv type mb plane is not coded
266 int dmb_is_raw; ///< direct mb plane is raw
267 int skip_is_raw; ///< skip mb plane is not coded
268 uint8_t luty[256], lutuv[256]; // lookup tables used for intensity compensation
269 int use_ic; ///< use intensity compensation in B-frames
270 int rnd; ///< rounding control
272 /** Frame decoding info for S/M profiles only */
274 uint8_t rangeredfrm; ///< out_sample = CLIP((in_sample-128)*2+128)
278 /** Frame decoding info for Advanced profile */
280 uint8_t fcm; ///< 0->Progressive, 2->Frame-Interlace, 3->Field-Interlace
281 uint8_t numpanscanwin;
283 uint8_t rptfrm, tff, rff;
286 uint16_t bottomrightx;
287 uint16_t bottomrighty;
290 int hrd_num_leaky_buckets;
291 uint8_t bit_rate_exponent;
292 uint8_t buffer_size_exponent;
293 uint8_t* acpred_plane; ///< AC prediction flags bitplane
295 uint8_t* over_flags_plane; ///< Overflags bitplane
298 uint16_t *hrd_rate, *hrd_buffer;
299 uint8_t *hrd_fullness;
300 uint8_t range_mapy_flag;
301 uint8_t range_mapuv_flag;
310 uint32_t *cbp_base, *cbp;
311 uint8_t bfraction_lut_index;///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
312 uint8_t broken_link; ///< Broken link flag (BROKEN_LINK syntax element)
313 uint8_t closed_entry; ///< Closed entry point flag (CLOSED_ENTRY syntax element)
315 int parse_only; ///< Context is used within parser
320 /** Find VC-1 marker in buffer
321 * @return position where next marker starts or end of buffer if no marker found
323 static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
325 uint32_t mrk = 0xFFFFFFFF;
327 if(end-src < 4) return end;
329 mrk = (mrk << 8) | *src++;
336 static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
341 for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;
344 for(i = 0; i < size; i++, src++) {
345 if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
346 dst[dsize++] = src[1];
356 * Decode Simple/Main Profiles sequence header
357 * @see Figure 7-8, p16-17
358 * @param avctx Codec context
359 * @param gb GetBit context initialized from Codec context extra_data
362 int vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
364 int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
366 int vc1_parse_frame_header (VC1Context *v, GetBitContext *gb);
367 int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb);
369 #endif /* AVCODEC_VC1_H */