FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/loco.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 117 182 64.3%
Branches: 49 105 46.7%

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1 /*
2 * LOCO codec
3 * Copyright (c) 2005 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * LOCO codec.
25 */
26
27 #include "avcodec.h"
28 #include "get_bits.h"
29 #include "golomb.h"
30 #include "internal.h"
31 #include "mathops.h"
32
33 enum LOCO_MODE {
34 LOCO_UNKN = 0,
35 LOCO_CYUY2 = -1,
36 LOCO_CRGB = -2,
37 LOCO_CRGBA = -3,
38 LOCO_CYV12 = -4,
39 LOCO_YUY2 = 1,
40 LOCO_UYVY = 2,
41 LOCO_RGB = 3,
42 LOCO_RGBA = 4,
43 LOCO_YV12 = 5,
44 };
45
46 typedef struct LOCOContext {
47 AVCodecContext *avctx;
48 int lossy;
49 enum LOCO_MODE mode;
50 } LOCOContext;
51
52 typedef struct RICEContext {
53 GetBitContext gb;
54 int save, run, run2; /* internal rice decoder state */
55 int sum, count; /* sum and count for getting rice parameter */
56 int lossy;
57 } RICEContext;
58
59 500785 static int loco_get_rice_param(RICEContext *r)
60 {
61 500785 int cnt = 0;
62 500785 int val = r->count;
63
64
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2389200 while (r->sum > val && cnt < 9) {
65 1888415 val <<= 1;
66 1888415 cnt++;
67 }
68
69 500785 return cnt;
70 }
71
72 505344 static inline void loco_update_rice_param(RICEContext *r, int val)
73 {
74 505344 r->sum += val;
75 505344 r->count++;
76
77
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505344 if (r->count == 16) {
78 63144 r->sum >>= 1;
79 63144 r->count >>= 1;
80 }
81 505344 }
82
83 505344 static inline int loco_get_rice(RICEContext *r)
84 {
85 unsigned v;
86
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505344 if (r->run > 0) { /* we have zero run */
87 4559 r->run--;
88 4559 loco_update_rice_param(r, 0);
89 4559 return 0;
90 }
91
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500785 if (get_bits_left(&r->gb) < 1)
92 return INT_MIN;
93 500785 v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0);
94 500785 loco_update_rice_param(r, (v + 1) >> 1);
95
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500785 if (!v) {
96
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49474 if (r->save >= 0) {
97 2574 r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0);
98
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2574 if (r->run > 1)
99 901 r->save += r->run + 1;
100 else
101 1673 r->save -= 3;
102 } else
103 46900 r->run2++;
104 } else {
105 451311 v = ((v >> 1) + r->lossy) ^ -(v & 1);
106
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451311 if (r->run2 > 0) {
107
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27417 if (r->run2 > 2)
108 3721 r->save += r->run2;
109 else
110 23696 r->save -= 3;
111 27417 r->run2 = 0;
112 }
113 }
114
115 500785 return v;
116 }
117
118 /* LOCO main predictor - LOCO-I/JPEG-LS predictor */
119 498348 static inline int loco_predict(uint8_t* data, int stride)
120 {
121 int a, b, c;
122
123 498348 a = data[-stride];
124 498348 b = data[-1];
125 498348 c = data[-stride - 1];
126
127 498348 return mid_pred(a, a + b - c, b);
128 }
129
130 24 static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height,
131 int stride, const uint8_t *buf, int buf_size)
132 {
133 RICEContext rc;
134 unsigned val;
135 int ret;
136 int i, j;
137
138
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24 if(buf_size<=0)
139 return -1;
140
141
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24 if ((ret = init_get_bits8(&rc.gb, buf, buf_size)) < 0)
142 return ret;
143
144 24 rc.save = 0;
145 24 rc.run = 0;
146 24 rc.run2 = 0;
147 24 rc.lossy = l->lossy;
148
149 24 rc.sum = 8;
150 24 rc.count = 1;
151
152 /* restore top left pixel */
153 24 val = loco_get_rice(&rc);
154 24 data[0] = 128 + val;
155 /* restore top line */
156
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3948 for (i = 1; i < width; i++) {
157 3924 val = loco_get_rice(&rc);
158
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3924 if (val == INT_MIN)
159 return AVERROR_INVALIDDATA;
160 3924 data[i] = data[i - 1] + val;
161 }
162 24 data += stride;
163
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3072 for (j = 1; j < height; j++) {
164 /* restore left column */
165 3048 val = loco_get_rice(&rc);
166
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3048 if (val == INT_MIN)
167 return AVERROR_INVALIDDATA;
168 3048 data[0] = data[-stride] + val;
169 /* restore all other pixels */
170
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501396 for (i = 1; i < width; i++) {
171 498348 val = loco_get_rice(&rc);
172
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498348 if (val == INT_MIN)
173 return -1;
174 498348 data[i] = loco_predict(&data[i], stride) + val;
175 }
176 3048 data += stride;
177 }
178
179 24 return (get_bits_count(&rc.gb) + 7) >> 3;
180 }
181
182 static void rotate_faulty_loco(uint8_t *data, int width, int height, int stride)
183 {
184 int y;
185
186 for (y=1; y<height; y++) {
187 if (width>=y) {
188 memmove(data + y*stride,
189 data + y*(stride + 1),
190 (width-y));
191 if (y+1 < height)
192 memmove(data + y*stride + (width-y),
193 data + (y+1)*stride, y);
194 }
195 }
196 }
197
198 8 static int decode_frame(AVCodecContext *avctx,
199 void *data, int *got_frame,
200 AVPacket *avpkt)
201 {
202 8 LOCOContext * const l = avctx->priv_data;
203 8 const uint8_t *buf = avpkt->data;
204 8 int buf_size = avpkt->size;
205 8 AVFrame * const p = data;
206 int decoded, ret;
207
208
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8 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
209 return ret;
210 8 p->key_frame = 1;
211
212 #define ADVANCE_BY_DECODED do { \
213 if (decoded < 0 || decoded >= buf_size) goto buf_too_small; \
214 buf += decoded; buf_size -= decoded; \
215 } while(0)
216
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8 switch(l->mode) {
217 3 case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY:
218 3 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
219 p->linesize[0], buf, buf_size);
220
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3 ADVANCE_BY_DECODED;
221 3 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height,
222 p->linesize[1], buf, buf_size);
223
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3 ADVANCE_BY_DECODED;
224 3 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height,
225 p->linesize[2], buf, buf_size);
226 3 break;
227 case LOCO_CYV12: case LOCO_YV12:
228 decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height,
229 p->linesize[0], buf, buf_size);
230 ADVANCE_BY_DECODED;
231 decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2,
232 p->linesize[2], buf, buf_size);
233 ADVANCE_BY_DECODED;
234 decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2,
235 p->linesize[1], buf, buf_size);
236 break;
237 5 case LOCO_CRGB: case LOCO_RGB:
238 5 decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height,
239 5 -p->linesize[1], buf, buf_size);
240
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5 ADVANCE_BY_DECODED;
241 5 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
242 5 -p->linesize[0], buf, buf_size);
243
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5 ADVANCE_BY_DECODED;
244 5 decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height,
245 5 -p->linesize[2], buf, buf_size);
246
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5 if (avctx->width & 1) {
247 rotate_faulty_loco(p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[0]);
248 rotate_faulty_loco(p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[1]);
249 rotate_faulty_loco(p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[2]);
250 }
251 5 break;
252 case LOCO_CRGBA:
253 case LOCO_RGBA:
254 decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height,
255 -p->linesize[1], buf, buf_size);
256 ADVANCE_BY_DECODED;
257 decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height,
258 -p->linesize[0], buf, buf_size);
259 ADVANCE_BY_DECODED;
260 decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height,
261 -p->linesize[2], buf, buf_size);
262 ADVANCE_BY_DECODED;
263 decoded = loco_decode_plane(l, p->data[3] + p->linesize[3]*(avctx->height-1), avctx->width, avctx->height,
264 -p->linesize[3], buf, buf_size);
265 break;
266 default:
267 av_assert0(0);
268 }
269
270
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8 if (decoded < 0 || decoded > buf_size)
271 goto buf_too_small;
272 8 buf_size -= decoded;
273
274 8 *got_frame = 1;
275
276 8 return avpkt->size - buf_size;
277 buf_too_small:
278 av_log(avctx, AV_LOG_ERROR, "Input data too small.\n");
279 return AVERROR(EINVAL);
280 }
281
282 4 static av_cold int decode_init(AVCodecContext *avctx)
283 {
284 4 LOCOContext * const l = avctx->priv_data;
285 int version;
286
287 4 l->avctx = avctx;
288
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4 if (avctx->extradata_size < 12) {
289 av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n",
290 avctx->extradata_size);
291 return AVERROR_INVALIDDATA;
292 }
293 4 version = AV_RL32(avctx->extradata);
294
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4 switch (version) {
295 case 1:
296 l->lossy = 0;
297 break;
298 4 case 2:
299 4 l->lossy = AV_RL32(avctx->extradata + 8);
300 4 break;
301 default:
302 l->lossy = AV_RL32(avctx->extradata + 8);
303 avpriv_request_sample(avctx, "LOCO codec version %i", version);
304 }
305
306
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4 if (l->lossy > 65536U) {
307 av_log(avctx, AV_LOG_ERROR, "lossy %i is too large\n", l->lossy);
308 return AVERROR_INVALIDDATA;
309 }
310
311 4 l->mode = AV_RL32(avctx->extradata + 4);
312
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4 switch (l->mode) {
313 2 case LOCO_CYUY2:
314 case LOCO_YUY2:
315 case LOCO_UYVY:
316 2 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
317 2 break;
318 2 case LOCO_CRGB:
319 case LOCO_RGB:
320 2 avctx->pix_fmt = AV_PIX_FMT_GBRP;
321 2 break;
322 case LOCO_CYV12:
323 case LOCO_YV12:
324 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
325 break;
326 case LOCO_CRGBA:
327 case LOCO_RGBA:
328 avctx->pix_fmt = AV_PIX_FMT_GBRAP;
329 break;
330 default:
331 av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode);
332 return AVERROR_INVALIDDATA;
333 }
334
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4 if (avctx->debug & FF_DEBUG_PICT_INFO)
335 av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode);
336
337 4 return 0;
338 }
339
340 const AVCodec ff_loco_decoder = {
341 .name = "loco",
342 .long_name = NULL_IF_CONFIG_SMALL("LOCO"),
343 .type = AVMEDIA_TYPE_VIDEO,
344 .id = AV_CODEC_ID_LOCO,
345 .priv_data_size = sizeof(LOCOContext),
346 .init = decode_init,
347 .decode = decode_frame,
348 .capabilities = AV_CODEC_CAP_DR1,
349 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
350 };
351