FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/loco.c
Date: 2022-07-07 01:21:54
Exec Total Coverage
Lines: 116 181 64.1%
Branches: 49 105 46.7%

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