FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ffv1dec_template.c
Go to the documentation of this file.
1 /*
2  * FFV1 decoder template
3  *
4  * Copyright (c) 2003-2016 Michael Niedermayer <michaelni@gmx.at>
5  *
6  * This file is part of FFmpeg.
7  *
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.
12  *
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.
17  *
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
21  */
22 
23 static av_always_inline void RENAME(decode_line)(FFV1Context *s, int w,
24  TYPE *sample[2],
25  int plane_index, int bits)
26 {
27  PlaneContext *const p = &s->plane[plane_index];
28  RangeCoder *const c = &s->c;
29  int x;
30  int run_count = 0;
31  int run_mode = 0;
32  int run_index = s->run_index;
33 
34  if (s->slice_coding_mode == 1) {
35  int i;
36  for (x = 0; x < w; x++) {
37  int v = 0;
38  for (i=0; i<bits; i++) {
39  uint8_t state = 128;
40  v += v + get_rac(c, &state);
41  }
42  sample[1][x] = v;
43  }
44  return;
45  }
46 
47  for (x = 0; x < w; x++) {
48  int diff, context, sign;
49 
50  context = RENAME(get_context)(p, sample[1] + x, sample[0] + x, sample[1] + x);
51  if (context < 0) {
52  context = -context;
53  sign = 1;
54  } else
55  sign = 0;
56 
57  av_assert2(context < p->context_count);
58 
59  if (s->ac != AC_GOLOMB_RICE) {
60  diff = get_symbol_inline(c, p->state[context], 1);
61  } else {
62  if (context == 0 && run_mode == 0)
63  run_mode = 1;
64 
65  if (run_mode) {
66  if (run_count == 0 && run_mode == 1) {
67  if (get_bits1(&s->gb)) {
68  run_count = 1 << ff_log2_run[run_index];
69  if (x + run_count <= w)
70  run_index++;
71  } else {
72  if (ff_log2_run[run_index])
73  run_count = get_bits(&s->gb, ff_log2_run[run_index]);
74  else
75  run_count = 0;
76  if (run_index)
77  run_index--;
78  run_mode = 2;
79  }
80  }
81  run_count--;
82  if (run_count < 0) {
83  run_mode = 0;
84  run_count = 0;
85  diff = get_vlc_symbol(&s->gb, &p->vlc_state[context],
86  bits);
87  if (diff >= 0)
88  diff++;
89  } else
90  diff = 0;
91  } else
92  diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
93 
94  ff_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
95  run_count, run_index, run_mode, x, get_bits_count(&s->gb));
96  }
97 
98  if (sign)
99  diff = -diff;
100 
101  sample[1][x] = av_mod_uintp2(RENAME(predict)(sample[1] + x, sample[0] + x) + diff, bits);
102  }
103  s->run_index = run_index;
104 }
105 
106 static void RENAME(decode_rgb_frame)(FFV1Context *s, uint8_t *src[3], int w, int h, int stride[3])
107 {
108  int x, y, p;
109  TYPE *sample[4][2];
110  int lbd = s->avctx->bits_per_raw_sample <= 8;
111  int bits = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 8;
112  int offset = 1 << bits;
113 
114  for (x = 0; x < 4; x++) {
115  sample[x][0] = RENAME(s->sample_buffer) + x * 2 * (w + 6) + 3;
116  sample[x][1] = RENAME(s->sample_buffer) + (x * 2 + 1) * (w + 6) + 3;
117  }
118 
119  s->run_index = 0;
120 
121  memset(RENAME(s->sample_buffer), 0, 8 * (w + 6) * sizeof(*RENAME(s->sample_buffer)));
122 
123  for (y = 0; y < h; y++) {
124  for (p = 0; p < 3 + s->transparency; p++) {
125  TYPE *temp = sample[p][0]; // FIXME: try a normal buffer
126 
127  sample[p][0] = sample[p][1];
128  sample[p][1] = temp;
129 
130  sample[p][1][-1]= sample[p][0][0 ];
131  sample[p][0][ w]= sample[p][0][w-1];
132  if (lbd && s->slice_coding_mode == 0)
133  RENAME(decode_line)(s, w, sample[p], (p + 1)/2, 9);
134  else
135  RENAME(decode_line)(s, w, sample[p], (p + 1)/2, bits + (s->slice_coding_mode != 1));
136  }
137  for (x = 0; x < w; x++) {
138  int g = sample[0][1][x];
139  int b = sample[1][1][x];
140  int r = sample[2][1][x];
141  int a = sample[3][1][x];
142 
143  if (s->slice_coding_mode != 1) {
144  b -= offset;
145  r -= offset;
146  g -= (b * s->slice_rct_by_coef + r * s->slice_rct_ry_coef) >> 2;
147  b += g;
148  r += g;
149  }
150 
151  if (lbd)
152  *((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + (g<<8) + (r<<16) + (a<<24);
153  else if (sizeof(TYPE) == 4) {
154  *((uint16_t*)(src[0] + x*2 + stride[0]*y)) = g;
155  *((uint16_t*)(src[1] + x*2 + stride[1]*y)) = b;
156  *((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r;
157  } else {
158  *((uint16_t*)(src[0] + x*2 + stride[0]*y)) = b;
159  *((uint16_t*)(src[1] + x*2 + stride[1]*y)) = g;
160  *((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r;
161  }
162  }
163  }
164 }
const uint8_t ff_log2_run[41]
Definition: bitstream.c:40
const char * s
Definition: avisynth_c.h:768
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:247
else temp
Definition: vf_mcdeint.c:259
const char * g
Definition: vf_curves.c:112
#define RENAME(name)
Definition: ffv1.h:205
const char * b
Definition: vf_curves.c:113
static av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state, int is_signed)
Definition: ffv1dec.c:42
static av_always_inline void predict(PredictorState *ps, float *coef, int output_enable)
Definition: aacdec.c:174
#define sample
uint8_t bits
Definition: crc.c:296
uint8_t
static int get_rac(RangeCoder *c, uint8_t *const state)
Definition: rangecoder.h:115
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:199
#define ff_dlog(a,...)
VlcState * vlc_state
Definition: ffv1.h:73
const char * r
Definition: vf_curves.c:111
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
static int get_vlc_symbol(GetBitContext *gb, VlcState *const state, int bits)
Definition: ffv1dec.c:70
int run_index
Definition: ffv1.h:109
#define src
Definition: vp9dsp.c:530
int context_count[MAX_QUANT_TABLES]
Definition: ffv1.h:106
static struct @246 state
#define TYPE
Definition: ffv1.h:204
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
#define AC_GOLOMB_RICE
Definition: ffv1.h:56
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
static double c[64]
uint8_t(* state)[CONTEXT_SIZE]
Definition: ffv1.h:72
static av_always_inline int diff(const uint32_t a, const uint32_t b)
#define av_always_inline
Definition: attributes.h:39