FFmpeg
ffv1enc_template.c
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1 /*
2  * FFV1 encoder 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 #include "ffv1_template.c"
24 
25 static av_always_inline int
26 RENAME(encode_line)(FFV1Context *f, FFV1SliceContext *sc,
27  void *logctx,
28  int w, TYPE *sample[3], int plane_index, int bits,
29  int ac, int pass1)
30 {
31  PlaneContext *const p = &sc->plane[plane_index];
32  RangeCoder *const c = &sc->c;
33  int x;
34  int run_index = sc->run_index;
35  int run_count = 0;
36  int run_mode = 0;
37 
38  if (ac != AC_GOLOMB_RICE) {
39  if (c->bytestream_end - c->bytestream < w * 35) {
40  av_log(logctx, AV_LOG_ERROR, "encoded Range Coder frame too large\n");
41  return AVERROR_INVALIDDATA;
42  }
43  } else {
44  if (put_bytes_left(&sc->pb, 0) < w * 4) {
45  av_log(logctx, AV_LOG_ERROR, "encoded Golomb Rice frame too large\n");
46  return AVERROR_INVALIDDATA;
47  }
48  }
49 
50  if (sc->slice_coding_mode == 1) {
51  for (x = 0; x < w; x++) {
52  int i;
53  int v = sample[0][x];
54  for (i = bits-1; i>=0; i--) {
55  uint8_t state = 128;
56  put_rac(c, &state, (v>>i) & 1);
57  }
58  }
59  return 0;
60  }
61 
62  for (x = 0; x < w; x++) {
63  int diff, context;
64 
65  context = RENAME(get_context)(f->quant_tables[p->quant_table_index],
66  sample[0] + x, sample[1] + x, sample[2] + x);
67  diff = sample[0][x] - RENAME(predict)(sample[0] + x, sample[1] + x);
68 
69  if (context < 0) {
70  context = -context;
71  diff = -diff;
72  }
73 
74  diff = fold(diff, bits);
75 
76  if (ac != AC_GOLOMB_RICE) {
77  if (pass1) {
78  put_symbol_inline(c, p->state[context], diff, 1, sc->rc_stat,
79  sc->rc_stat2[p->quant_table_index][context]);
80  } else {
81  put_symbol_inline(c, p->state[context], diff, 1, NULL, NULL);
82  }
83  } else {
84  if (context == 0)
85  run_mode = 1;
86 
87  if (run_mode) {
88  if (diff) {
89  while (run_count >= 1 << ff_log2_run[run_index]) {
90  run_count -= 1 << ff_log2_run[run_index];
91  run_index++;
92  put_bits(&sc->pb, 1, 1);
93  }
94 
95  put_bits(&sc->pb, 1 + ff_log2_run[run_index], run_count);
96  if (run_index)
97  run_index--;
98  run_count = 0;
99  run_mode = 0;
100  if (diff > 0)
101  diff--;
102  } else {
103  run_count++;
104  }
105  }
106 
107  ff_dlog(logctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
108  run_count, run_index, run_mode, x,
109  (int)put_bits_count(&sc->pb));
110 
111  if (run_mode == 0)
112  put_vlc_symbol(&sc->pb, &p->vlc_state[context], diff, bits);
113  }
114  }
115  if (run_mode) {
116  while (run_count >= 1 << ff_log2_run[run_index]) {
117  run_count -= 1 << ff_log2_run[run_index];
118  run_index++;
119  put_bits(&sc->pb, 1, 1);
120  }
121 
122  if (run_count)
123  put_bits(&sc->pb, 1, 1);
124  }
125  sc->run_index = run_index;
126 
127  return 0;
128 }
129 
130 static void RENAME(load_rgb_frame)(FFV1Context *f, FFV1SliceContext *sc,
131  const uint8_t *src[4],
132  int w, int h, const int stride[4])
133 {
134  int x, y;
135  int transparency = f->transparency;
136 
137  memset(sc->fltmap, 0, sizeof(sc->fltmap));
138 
139  for (y = 0; y < h; y++) {
140  for (x = 0; x < w; x++) {
141  int b, g, r, av_uninit(a);
142 
143  if (sizeof(TYPE) == 4 || transparency) {
144  g = *((const uint16_t *)(src[0] + x*2 + stride[0]*y));
145  b = *((const uint16_t *)(src[1] + x*2 + stride[1]*y));
146  r = *((const uint16_t *)(src[2] + x*2 + stride[2]*y));
147  if (transparency)
148  a = *((const uint16_t *)(src[3] + x*2 + stride[3]*y));
149  } else {
150  b = *((const uint16_t *)(src[0] + x*2 + stride[0]*y));
151  g = *((const uint16_t *)(src[1] + x*2 + stride[1]*y));
152  r = *((const uint16_t *)(src[2] + x*2 + stride[2]*y));
153  }
154 
155  sc->fltmap[0][r] = 1;
156  sc->fltmap[1][g] = 1;
157  sc->fltmap[2][b] = 1;
158  if (transparency)
159  sc->fltmap[3][a] = 1;
160  }
161  }
162 }
163 
164 static int RENAME(encode_rgb_frame)(FFV1Context *f, FFV1SliceContext *sc,
165  const uint8_t *src[4],
166  int w, int h, const int stride[4], int ac)
167 {
168  int x, y, p, i;
169  const int ring_size = f->context_model ? 3 : 2;
170  TYPE *sample[4][3];
171  const int pass1 = !!(f->avctx->flags & AV_CODEC_FLAG_PASS1);
172  int lbd = f->bits_per_raw_sample <= 8;
173  int packed = !src[1];
174  int bits = f->bits_per_raw_sample > 0 ? f->bits_per_raw_sample : 8;
175  int offset = 1 << bits;
176  int transparency = f->transparency;
177  int packed_size = (3 + transparency)*2;
178 
179  sc->run_index = 0;
180 
181  memset(RENAME(sc->sample_buffer), 0, ring_size * MAX_PLANES *
182  (w + 6) * sizeof(*RENAME(sc->sample_buffer)));
183 
184  for (y = 0; y < h; y++) {
185  for (i = 0; i < ring_size; i++)
186  for (p = 0; p < MAX_PLANES; p++)
187  sample[p][i]= RENAME(sc->sample_buffer) + p*ring_size*(w+6) + ((h+i-y)%ring_size)*(w+6) + 3;
188 
189  for (x = 0; x < w; x++) {
190  int b, g, r, av_uninit(a);
191  if (lbd) {
192  unsigned v = *((const uint32_t*)(src[0] + x*4 + stride[0]*y));
193  b = v & 0xFF;
194  g = (v >> 8) & 0xFF;
195  r = (v >> 16) & 0xFF;
196  a = v >> 24;
197  } else if (packed) {
198  const uint16_t *p = ((const uint16_t*)(src[0] + x*packed_size + stride[0]*y));
199  r = p[0];
200  g = p[1];
201  b = p[2];
202  if (transparency)
203  a = p[3];
204  } else if (sizeof(TYPE) == 4 || transparency) {
205  g = *((const uint16_t *)(src[0] + x*2 + stride[0]*y));
206  b = *((const uint16_t *)(src[1] + x*2 + stride[1]*y));
207  r = *((const uint16_t *)(src[2] + x*2 + stride[2]*y));
208  if (transparency)
209  a = *((const uint16_t *)(src[3] + x*2 + stride[3]*y));
210  } else {
211  b = *((const uint16_t *)(src[0] + x*2 + stride[0]*y));
212  g = *((const uint16_t *)(src[1] + x*2 + stride[1]*y));
213  r = *((const uint16_t *)(src[2] + x*2 + stride[2]*y));
214  }
215 
216  if (sc->remap) {
217  r = sc->fltmap[0][r];
218  g = sc->fltmap[1][g];
219  b = sc->fltmap[2][b];
220  if (transparency)
221  a = sc->fltmap[3][a];
222  }
223 
224  if (sc->slice_coding_mode != 1) {
225  b -= g;
226  r -= g;
227  g += (b * sc->slice_rct_by_coef + r * sc->slice_rct_ry_coef) >> 2;
228  b += offset;
229  r += offset;
230  }
231 
232  sample[0][0][x] = g;
233  sample[1][0][x] = b;
234  sample[2][0][x] = r;
235  sample[3][0][x] = a;
236  }
237  for (p = 0; p < 3 + transparency; p++) {
238  int ret;
239  sample[p][0][-1] = sample[p][1][0 ];
240  sample[p][1][ w] = sample[p][1][w-1];
241  if (lbd && sc->slice_coding_mode == 0)
242  ret = RENAME(encode_line)(f, sc, f->avctx, w, sample[p], (p + 1) / 2, 9, ac, pass1);
243  else
244  ret = RENAME(encode_line)(f, sc, f->avctx, w, sample[p], (p + 1) / 2,
245  bits + (sc->slice_coding_mode != 1), ac, pass1);
246  if (ret < 0)
247  return ret;
248  }
249  }
250  return 0;
251 }
252 
load_rgb_frame
static void RENAME() load_rgb_frame(FFV1Context *f, FFV1SliceContext *sc, const uint8_t *src[4], int w, int h, const int stride[4])
Definition: ffv1enc_template.c:130
encode_line
static av_always_inline int RENAME() encode_line(FFV1Context *f, FFV1SliceContext *sc, void *logctx, int w, TYPE *sample[3], int plane_index, int bits, int ac, int pass1)
Definition: ffv1enc_template.c:26
r
const char * r
Definition: vf_curves.c:127
put_symbol_inline
static av_always_inline av_flatten void put_symbol_inline(RangeCoder *c, uint8_t *state, int v, int is_signed, uint64_t rc_stat[256][2], uint64_t rc_stat2[32][2])
Definition: ffv1enc.c:184
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:223
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Definition: input.c:41
predict
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PlaneContext::state
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Definition: ffv1.h:67
ring_size
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Definition: async.c:105
put_bytes_left
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Definition: put_bits.h:135
AV_LOG_ERROR
#define AV_LOG_ERROR
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Definition: log.h:209
MAX_PLANES
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Definition: ffv1.h:44
g
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Definition: vf_curves.c:128
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ffv1_template.c
fold
static av_always_inline int fold(int diff, int bits)
Definition: ffv1.h:197
context
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option keep it simple and lowercase description are in without and describe what they for example set the foo of the bar offset is the offset of the field in your context
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#define TYPE
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Definition: ffv1.h:68
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#define AC_GOLOMB_RICE
Definition: ffv1.h:52
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Definition: ffv1.h:64
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Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
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Definition: undefined.txt:41
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Definition: put_bits.h:80
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Definition: ffv1enc_template.c:164
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