2 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * VP5 and VP6 compatible video decoder (common features)
26 #ifndef AVCODEC_VP56_H
27 #define AVCODEC_VP56_H
31 #include "bytestream.h"
32 #include "h264chroma.h"
37 typedef struct vp56_context VP56Context
;
41 VP56_FRAME_CURRENT
= 0,
42 VP56_FRAME_PREVIOUS
= 1,
43 VP56_FRAME_GOLDEN
= 2,
44 VP56_FRAME_GOLDEN2
= 3,
48 VP56_MB_INTER_NOVEC_PF
= 0, /**< Inter MB, no vector, from previous frame */
49 VP56_MB_INTRA
= 1, /**< Intra MB */
50 VP56_MB_INTER_DELTA_PF
= 2, /**< Inter MB, above/left vector + delta, from previous frame */
51 VP56_MB_INTER_V1_PF
= 3, /**< Inter MB, first vector, from previous frame */
52 VP56_MB_INTER_V2_PF
= 4, /**< Inter MB, second vector, from previous frame */
53 VP56_MB_INTER_NOVEC_GF
= 5, /**< Inter MB, no vector, from golden frame */
54 VP56_MB_INTER_DELTA_GF
= 6, /**< Inter MB, above/left vector + delta, from golden frame */
55 VP56_MB_INTER_4V
= 7, /**< Inter MB, 4 vectors, from previous frame */
56 VP56_MB_INTER_V1_GF
= 8, /**< Inter MB, first vector, from golden frame */
57 VP56_MB_INTER_V2_GF
= 9, /**< Inter MB, second vector, from golden frame */
60 typedef struct VP56Tree
{
65 typedef struct VP56mv
{
66 DECLARE_ALIGNED(4, int16_t, x
);
70 #define VP56_SIZE_CHANGE 1
72 typedef void (*VP56ParseVectorAdjustment
)(VP56Context
*s
,
74 typedef void (*VP56Filter
)(VP56Context
*s
, uint8_t *dst
, uint8_t *src
,
75 int offset1
, int offset2
, int stride
,
76 VP56mv mv
, int mask
, int select
, int luma
);
77 typedef void (*VP56ParseCoeff
)(VP56Context
*s
);
78 typedef void (*VP56DefaultModelsInit
)(VP56Context
*s
);
79 typedef void (*VP56ParseVectorModels
)(VP56Context
*s
);
80 typedef int (*VP56ParseCoeffModels
)(VP56Context
*s
);
81 typedef int (*VP56ParseHeader
)(VP56Context
*s
, const uint8_t *buf
,
84 typedef struct VP56RangeCoder
{
86 int bits
; /* stored negated (i.e. negative "bits" is a positive number of
87 bits left) in order to eliminate a negate in cache refilling */
88 const uint8_t *buffer
;
90 unsigned int code_word
;
93 typedef struct VP56RefDc
{
99 typedef struct VP56Macroblock
{
104 typedef struct VP56Model
{
105 uint8_t coeff_reorder
[64]; /* used in vp6 only */
106 uint8_t coeff_index_to_pos
[64]; /* used in vp6 only */
107 uint8_t vector_sig
[2]; /* delta sign */
108 uint8_t vector_dct
[2]; /* delta coding types */
109 uint8_t vector_pdi
[2][2]; /* predefined delta init */
110 uint8_t vector_pdv
[2][7]; /* predefined delta values */
111 uint8_t vector_fdv
[2][8]; /* 8 bit delta value definition */
112 uint8_t coeff_dccv
[2][11]; /* DC coeff value */
113 uint8_t coeff_ract
[2][3][6][11]; /* Run/AC coding type and AC coeff value */
114 uint8_t coeff_acct
[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
115 uint8_t coeff_dcct
[2][36][5]; /* DC coeff coding type */
116 uint8_t coeff_runv
[2][14]; /* run value (vp6 only) */
117 uint8_t mb_type
[3][10][10]; /* model for decoding MB type */
118 uint8_t mb_types_stats
[3][10][2];/* contextual, next MB type stats */
121 struct vp56_context
{
122 AVCodecContext
*avctx
;
123 H264ChromaContext h264chroma
;
125 VideoDSPContext vdsp
;
126 VP3DSPContext vp3dsp
;
127 VP56DSPContext vp56dsp
;
128 uint8_t idct_scantable
[64];
130 uint8_t *edge_emu_buffer_alloc
;
131 uint8_t *edge_emu_buffer
;
141 int mb_width
; /* number of horizontal MB */
142 int mb_height
; /* number of vertical MB */
149 /* DC predictors management */
150 VP56RefDc
*above_blocks
;
151 VP56RefDc left_block
[4];
152 int above_block_idx
[6];
153 int16_t prev_dc
[3][3]; /* [plan][ref_frame] */
155 /* blocks / macroblock */
157 VP56Macroblock
*macroblocks
;
158 DECLARE_ALIGNED(16, int16_t, block_coeff
)[6][64];
161 VP56mv mv
[6]; /* vectors for each block in MB */
162 VP56mv vector_candidate
[2];
163 int vector_candidate_pos
;
165 /* filtering hints */
166 int filter_header
; /* used in vp6 only */
167 int deblock_filtering
;
168 int filter_selection
;
170 int max_vector_length
;
171 int sample_variance_threshold
;
173 uint8_t coeff_ctx
[4][64]; /* used in vp5 only */
174 uint8_t coeff_ctx_last
[4]; /* used in vp5 only */
178 /* upside-down flipping hints */
179 int flip
; /* are we flipping ? */
180 int frbi
; /* first row block index in MB */
181 int srbi
; /* second row block index in MB */
182 int stride
[4]; /* stride for each plan */
184 const uint8_t *vp56_coord_div
;
185 VP56ParseVectorAdjustment parse_vector_adjustment
;
187 VP56ParseCoeff parse_coeff
;
188 VP56DefaultModelsInit default_models_init
;
189 VP56ParseVectorModels parse_vector_models
;
190 VP56ParseCoeffModels parse_coeff_models
;
191 VP56ParseHeader parse_header
;
193 /* for "slice" parallelism between YUV and A */
194 VP56Context
*alpha_context
;
199 /* huffman decoding */
204 VLC ract_vlc
[2][3][6];
205 unsigned int nb_null
[2][2]; /* number of consecutive NULL DC/AC */
209 int ff_vp56_init(AVCodecContext
*avctx
, int flip
, int has_alpha
);
210 int ff_vp56_init_context(AVCodecContext
*avctx
, VP56Context
*s
,
211 int flip
, int has_alpha
);
212 int ff_vp56_free(AVCodecContext
*avctx
);
213 int ff_vp56_free_context(VP56Context
*s
);
214 void ff_vp56_init_dequant(VP56Context
*s
, int quantizer
);
215 int ff_vp56_decode_frame(AVCodecContext
*avctx
, void *data
, int *got_frame
,
220 * vp56 specific range coder implementation
223 extern const uint8_t ff_vp56_norm_shift
[256];
224 void ff_vp56_init_range_decoder(VP56RangeCoder
*c
, const uint8_t *buf
, int buf_size
);
226 static av_always_inline
unsigned int vp56_rac_renorm(VP56RangeCoder
*c
)
228 int shift
= ff_vp56_norm_shift
[c
->high
];
230 unsigned int code_word
= c
->code_word
;
235 if(bits
>= 0 && c
->buffer
< c
->end
) {
236 code_word
|= bytestream_get_be16(&c
->buffer
) << bits
;
244 #include "arm/vp56_arith.h"
246 #include "x86/vp56_arith.h"
249 #ifndef vp56_rac_get_prob
250 #define vp56_rac_get_prob vp56_rac_get_prob
251 static av_always_inline
int vp56_rac_get_prob(VP56RangeCoder
*c
, uint8_t prob
)
253 unsigned int code_word
= vp56_rac_renorm(c
);
254 unsigned int low
= 1 + (((c
->high
- 1) * prob
) >> 8);
255 unsigned int low_shift
= low
<< 16;
256 int bit
= code_word
>= low_shift
;
258 c
->high
= bit
? c
->high
- low
: low
;
259 c
->code_word
= bit
? code_word
- low_shift
: code_word
;
265 #ifndef vp56_rac_get_prob_branchy
266 // branchy variant, to be used where there's a branch based on the bit decoded
267 static av_always_inline
int vp56_rac_get_prob_branchy(VP56RangeCoder
*c
, int prob
)
269 unsigned long code_word
= vp56_rac_renorm(c
);
270 unsigned low
= 1 + (((c
->high
- 1) * prob
) >> 8);
271 unsigned low_shift
= low
<< 16;
273 if (code_word
>= low_shift
) {
275 c
->code_word
= code_word
- low_shift
;
280 c
->code_word
= code_word
;
285 static av_always_inline
int vp56_rac_get(VP56RangeCoder
*c
)
287 unsigned int code_word
= vp56_rac_renorm(c
);
289 int low
= (c
->high
+ 1) >> 1;
290 unsigned int low_shift
= low
<< 16;
291 int bit
= code_word
>= low_shift
;
294 code_word
-= low_shift
;
299 c
->code_word
= code_word
;
303 // rounding is different than vp56_rac_get, is vp56_rac_get wrong?
304 static av_always_inline
int vp8_rac_get(VP56RangeCoder
*c
)
306 return vp56_rac_get_prob(c
, 128);
309 static int vp56_rac_gets(VP56RangeCoder
*c
, int bits
)
314 value
= (value
<< 1) | vp56_rac_get(c
);
320 static int vp8_rac_get_uint(VP56RangeCoder
*c
, int bits
)
325 value
= (value
<< 1) | vp8_rac_get(c
);
331 // fixme: add 1 bit to all the calls to this?
332 static av_unused
int vp8_rac_get_sint(VP56RangeCoder
*c
, int bits
)
339 v
= vp8_rac_get_uint(c
, bits
);
348 static av_unused
int vp56_rac_gets_nn(VP56RangeCoder
*c
, int bits
)
350 int v
= vp56_rac_gets(c
, 7) << 1;
354 static av_unused
int vp8_rac_get_nn(VP56RangeCoder
*c
)
356 int v
= vp8_rac_get_uint(c
, 7) << 1;
360 static av_always_inline
361 int vp56_rac_get_tree(VP56RangeCoder
*c
,
362 const VP56Tree
*tree
,
363 const uint8_t *probs
)
365 while (tree
->val
> 0) {
366 if (vp56_rac_get_prob_branchy(c
, probs
[tree
->prob_idx
]))
374 // how probabilities are associated with decisions is different I think
375 // well, the new scheme fits in the old but this way has one fewer branches per decision
376 static av_always_inline
int vp8_rac_get_tree(VP56RangeCoder
*c
, const int8_t (*tree
)[2],
377 const uint8_t *probs
)
382 i
= tree
[i
][vp56_rac_get_prob(c
, probs
[i
])];
389 static av_always_inline
int vp8_rac_get_coeff(VP56RangeCoder
*c
, const uint8_t *prob
)
394 v
= (v
<<1) + vp56_rac_get_prob(c
, *prob
++);
400 #endif /* AVCODEC_VP56_H */