FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/gemdec.c
Date: 2021-10-25 13:57:44
Exec Total Coverage
Lines: 0 191 0.0%
Branches: 0 146 0.0%

Line Branch Exec Source
1 /*
2 * GEM Raster image decoder
3 * Copyright (c) 2021 Peter Ross (pross@xvid.org)
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 * GEM Raster image decoder
25 */
26
27 #include "avcodec.h"
28 #include "bytestream.h"
29 #include "internal.h"
30
31 static const uint32_t gem_color_palette[16]={
32 0xFFFFFFFF, 0xFFFF0000, 0xFF00FF00, 0xFFFFFF00,
33 0xFF0000FF, 0xFFFF00FF, 0xFF00FFFF, 0xFFAEAEAE,
34 0xFF555555, 0xFFAE0000, 0xFF00AE00, 0xFFAEAE00,
35 0xFF0000AE, 0xFFAE00AE, 0xFF00AEAE, 0xFF000000,
36 };
37
38 static const uint8_t gem_gray[256]={
39 0xFF, 0x7F, 0xBF, 0x3F, 0xDF, 0x5F, 0x9F, 0x1F, 0xEF, 0x6F, 0xAF, 0x2F, 0xCF, 0x4F, 0x8F, 0x0F,
40 0xF7, 0x77, 0xB7, 0x37, 0xD7, 0x57, 0x97, 0x17, 0xE7, 0x67, 0xA7, 0x27, 0xC7, 0x47, 0x87, 0x07,
41 0xFB, 0x7B, 0xBB, 0x3B, 0xDB, 0x5B, 0x9B, 0x1B, 0xEB, 0x6B, 0xAB, 0x2B, 0xCB, 0x4B, 0x8B, 0x0B,
42 0xF3, 0x73, 0xB3, 0x33, 0xD3, 0x53, 0x93, 0x13, 0xE3, 0x63, 0xA3, 0x23, 0xC3, 0x43, 0x83, 0x03,
43 0xFD, 0x7D, 0xBD, 0x3D, 0xDD, 0x5D, 0x9D, 0x1D, 0xED, 0x6D, 0xAD, 0x2D, 0xCD, 0x4D, 0x8D, 0x0D,
44 0xF5, 0x75, 0xB5, 0x35, 0xD5, 0x55, 0x95, 0x15, 0xE5, 0x65, 0xA5, 0x25, 0xC5, 0x45, 0x85, 0x05,
45 0xF9, 0x79, 0xB9, 0x39, 0xD9, 0x59, 0x99, 0x19, 0xE9, 0x69, 0xA9, 0x29, 0xC9, 0x49, 0x89, 0x09,
46 0xF1, 0x71, 0xB1, 0x31, 0xD1, 0x51, 0x91, 0x11, 0xE1, 0x61, 0xA1, 0x21, 0xC1, 0x41, 0x81, 0x01,
47 0xFE, 0x7E, 0xBE, 0x3E, 0xDE, 0x5E, 0x9E, 0x1E, 0xEE, 0x6E, 0xAE, 0x2E, 0xCE, 0x4E, 0x8E, 0x0E,
48 0xF6, 0x76, 0xB6, 0x36, 0xD6, 0x56, 0x96, 0x16, 0xE6, 0x66, 0xA6, 0x26, 0xC6, 0x46, 0x86, 0x06,
49 0xFA, 0x7A, 0xBA, 0x3A, 0xDA, 0x5A, 0x9A, 0x1A, 0xEA, 0x6A, 0xAA, 0x2A, 0xCA, 0x4A, 0x8A, 0x0A,
50 0xF2, 0x72, 0xB2, 0x32, 0xD2, 0x52, 0x92, 0x12, 0xE2, 0x62, 0xA2, 0x22, 0xC2, 0x42, 0x82, 0x02,
51 0xFC, 0x7C, 0xBC, 0x3C, 0xDC, 0x5C, 0x9C, 0x1C, 0xEC, 0x6C, 0xAC, 0x2C, 0xCC, 0x4C, 0x8C, 0x0C,
52 0xF4, 0x74, 0xB4, 0x34, 0xD4, 0x54, 0x94, 0x14, 0xE4, 0x64, 0xA4, 0x24, 0xC4, 0x44, 0x84, 0x04,
53 0xF8, 0x78, 0xB8, 0x38, 0xD8, 0x58, 0x98, 0x18, 0xE8, 0x68, 0xA8, 0x28, 0xC8, 0x48, 0x88, 0x08,
54 0xF0, 0x70, 0xB0, 0x30, 0xD0, 0x50, 0x90, 0x10, 0xE0, 0x60, 0xA0, 0x20, 0xC0, 0x40, 0x80, 0x00,
55 };
56
57 typedef struct {
58 int y, pl, x, vdup;
59 } State;
60
61 static void put_lines_bits(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p)
62 {
63 int pl_byte = state->pl / 8;
64 int pl_bit = state->pl & 7;
65 for (int y = 0; y < state->vdup && (state->y + y) < avctx->height; y++)
66 for (int x = 0; x < row_width; x++)
67 for (int i = 7; i >= 0 && x * 8 + 7 - i < avctx->width; i--)
68 p->data[0][ (state->y + y) * p->linesize[0] + (x * 8 + 7 - i) * pixel_size + pl_byte] |= !!(row[x] & (1 << i)) << pl_bit;
69
70 state->pl++;
71 if (state->pl >= planes) {
72 state->pl = 0;
73 state->y += state->vdup;
74 state->vdup = 1;
75 }
76 }
77
78 static void put_lines_bytes(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p)
79 {
80 for (int y = 0; y < state->vdup && (state->y + y) < avctx->height; y++)
81 memcpy(p->data[0] + (state->y + y) * p->linesize[0], row, avctx->width * pixel_size);
82
83 state->y += state->vdup;
84 state->vdup = 1;
85 }
86
87 static int gem_decode_frame(AVCodecContext *avctx,
88 void *data, int *got_frame,
89 AVPacket *avpkt)
90 {
91 const uint8_t *buf = avpkt->data;
92 int buf_size = avpkt->size;
93 const uint8_t *buf_end = buf + buf_size;
94 AVFrame *p = data;
95 int header_size, planes, pattern_size, tag = 0, count_scalar = 1, ret;
96 unsigned int x, count, v;
97 GetByteContext gb;
98 uint32_t *palette;
99 const uint8_t * b;
100 uint8_t * row;
101 int row_width, pixel_size;
102 State state = {.y = 0, .pl = 0, .x = 0, .vdup = 1};
103 void (*put_lines)(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p);
104 int width, height;
105
106 if (buf_size <= 16)
107 return AVERROR_INVALIDDATA;
108
109 bytestream2_init(&gb, buf + 2, buf_size - 2);
110 header_size = bytestream2_get_be16(&gb);
111 if (header_size < 8 || buf_size <= header_size * 2)
112 return AVERROR_INVALIDDATA;
113
114 planes = bytestream2_get_be16(&gb);
115 pattern_size = bytestream2_get_be16(&gb);
116 avctx->sample_aspect_ratio.num = bytestream2_get_be16(&gb);
117 avctx->sample_aspect_ratio.den = bytestream2_get_be16(&gb);
118 width = bytestream2_get_be16(&gb);
119 height = bytestream2_get_be16(&gb);
120 ret = ff_set_dimensions(avctx, width, height);
121 if (ret < 0)
122 return ret;
123
124 row_width = (avctx->width + 7) / 8;
125 put_lines = put_lines_bits;
126
127 if (header_size == 9) {
128 count_scalar = bytestream2_get_be16(&gb);
129 if (count_scalar != 3) {
130 avpriv_request_sample(avctx, "count_scalar=%d", count_scalar);
131 return AVERROR_PATCHWELCOME;
132 }
133 planes = 24;
134 avctx->pix_fmt = AV_PIX_FMT_BGR24;
135 pixel_size = 3;
136 } else if (planes == 15) {
137 #if HAVE_BIGENDIAN
138 avctx->pix_fmt = AV_PIX_FMT_BGR555BE;
139 #else
140 avctx->pix_fmt = AV_PIX_FMT_BGR555LE;
141 #endif
142 pixel_size = 2;
143 } else if (planes == 16) {
144 avctx->pix_fmt = AV_PIX_FMT_RGB565BE;
145 pixel_size = 2;
146 } else if (planes == 24) {
147 avctx->pix_fmt = AV_PIX_FMT_RGB24;
148 pixel_size = 3;
149 } else if (planes == 32) {
150 avctx->pix_fmt = AV_PIX_FMT_0RGB;
151 pixel_size = 4;
152 } else {
153 avctx->pix_fmt = AV_PIX_FMT_PAL8;
154 pixel_size = 1;
155 }
156
157 if (header_size >= 11)
158 tag = bytestream2_peek_be32(&gb);
159
160 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
161 return ret;
162
163 p->pict_type = AV_PICTURE_TYPE_I;
164 p->key_frame = 1;
165 p->palette_has_changed = 1;
166 palette = (uint32_t *)p->data[1];
167
168 if (tag == AV_RB32("STTT")) {
169 bytestream2_skip(&gb, 6);
170 if (planes == 4) {
171 for (int i = 0; i < (1 << planes); i++) {
172 int v = bytestream2_get_be16(&gb);
173 int r = ((v >> 8) & 0x7) << 5;
174 int g = ((v >> 4) & 0x7) << 5;
175 int b = ((v ) & 0x7) << 5;
176 palette[i] = 0xFF000000 | r << 16 | g << 8 | b;
177 }
178 } else {
179 avpriv_request_sample(avctx, "STTT planes=%d", planes);
180 return AVERROR_PATCHWELCOME;
181 }
182 } else if (tag == AV_RB32("TIMG")) {
183 bytestream2_skip(&gb, 4);
184 if (planes != 15) {
185 avpriv_request_sample(avctx, "TIMG planes=%d", planes);
186 return AVERROR_PATCHWELCOME;
187 }
188 } else if (tag == AV_RB32("XIMG")) {
189 bytestream2_skip(&gb, 6);
190 if (planes == 1 || planes == 2 || planes == 4 || planes == 8) {
191 for (int i = 0; i < (1 << planes); i++) {
192 int r = (bytestream2_get_be16(&gb) * 51 + 100) / 200;
193 int g = (bytestream2_get_be16(&gb) * 51 + 100) / 200;
194 int b = (bytestream2_get_be16(&gb) * 51 + 100) / 200;
195 palette[i] = 0xFF000000 | r << 16 | g << 8 | b;
196 }
197 } else if (planes == 16) {
198 planes = 1;
199 row_width = ((avctx->width + 7)/8)*8 * pixel_size;
200 put_lines = put_lines_bytes;
201 } else if (planes == 24) {
202 planes = 1;
203 row_width = ((avctx->width + 15)/16)*16 * pixel_size;
204 put_lines = put_lines_bytes;
205 } else if (planes == 32) {
206 planes = 1;
207 row_width = avctx->width * pixel_size;
208 put_lines = put_lines_bytes;
209 } else {
210 avpriv_request_sample(avctx, "XIMG planes=%d", planes);
211 return AVERROR_PATCHWELCOME;
212 }
213 } else if (planes == 1) {
214 palette[0] = 0xFFFFFFFF;
215 palette[1] = 0xFF000000;
216 } else if (planes == 2 || planes == 3 || planes == 4) {
217 if (header_size == 9 + (1 << planes)) {
218 bytestream2_skip(&gb, 2);
219 for (int i = 0; i < (1 << planes); i++) {
220 int v = bytestream2_get_be16(&gb);
221 int r = ((v >> 8) & 0x7) << 5;
222 int g = ((v >> 4) & 0x7) << 5;
223 int b = ((v ) & 0x7) << 5;
224 palette[i] = 0xFF000000 | r << 16 | g << 8 | b;
225 }
226 } else
227 memcpy(palette, gem_color_palette, sizeof(gem_color_palette));
228 } else if (planes == 8) {
229 for (int i = 0; i < 256; i++)
230 palette[i] = 0xFF000000 | (gem_gray[i]<<16) | (gem_gray[i]<<8) | gem_gray[i];
231 } else if (planes == 16) {
232 planes = 1;
233 row_width = avctx->width * pixel_size;
234 put_lines = put_lines_bytes;
235 } else if (planes == 24) {
236 planes = 1;
237 row_width = avctx->width * pixel_size;
238 put_lines = put_lines_bytes;
239 } else {
240 avpriv_request_sample(avctx, "planes=%d", planes);
241 return AVERROR_PATCHWELCOME;
242 }
243
244 ret = av_reallocp_array(&avctx->priv_data, planes, row_width);
245 if (ret < 0)
246 return ret;
247 row = avctx->priv_data;
248
249 memset(p->data[0], 0, avctx->height * p->linesize[0]);
250 b = buf + header_size * 2;
251 x = 0;
252
253 #define SKIP \
254 do { \
255 x++; \
256 if (x >= row_width) { \
257 put_lines(avctx, planes, row_width, pixel_size, &state, row + state.pl * row_width, p); \
258 if (state.y >= avctx->height) goto abort; \
259 x = 0; \
260 } \
261 } while(0)
262
263 #define PUT(v) \
264 do { \
265 row[state.pl * row_width + x++] = v; \
266 if (x >= row_width) { \
267 put_lines(avctx, planes, row_width, pixel_size, &state, row + state.pl * row_width, p); \
268 if (state.y >= avctx->height) goto abort; \
269 x = 0; \
270 } \
271 } while(0)
272
273 while(b < buf_end) {
274 int opcode = *b++;
275 if (opcode == 0x80) { /* copy */
276 if (b >= buf_end)
277 goto abort;
278 count = *b++;
279 if (!count)
280 count = 256;
281 count *= count_scalar;
282 for (int j = 0; j < count; j++) {
283 if (b >= buf_end)
284 goto abort;
285 PUT(*b++);
286 }
287 } else if (opcode) { /* run */
288 count = opcode & 0x7f;
289 if (!count)
290 count = 256;
291 count *= count_scalar;
292 v = opcode & 0x80 ? 0xFF : 0x00;
293 for (int i = 0; i < count; i++)
294 PUT(v);
295 } else {
296 if (b >= buf_end)
297 goto abort;
298 count = *b++;
299 if (count) { /* pattern */
300 if (b > buf_end - pattern_size)
301 goto abort;
302
303 count *= count_scalar;
304 for (int j = 0; j < count; j++)
305 for (int k = 0; k < pattern_size; k++)
306 PUT(b[k]);
307
308 b += pattern_size;
309 } else {
310 if (b >= buf_end)
311 goto abort;
312 count = *b++;
313 if (count == 0xFF) { /* vertical duplication */
314 if (b >= buf_end)
315 goto abort;
316 state.vdup = *b++;
317 if (!state.vdup)
318 state.vdup = 256;
319 } else { /* horizontal duplication */
320 for (int i = 0; i < count + 1; i++)
321 SKIP;
322 }
323 }
324 }
325 }
326
327 abort:
328
329 *got_frame = 1;
330 return buf_size;
331 }
332
333 static av_cold int gem_close(AVCodecContext *avctx)
334 {
335 av_freep(&avctx->priv_data);
336 return 0;
337 }
338
339 const AVCodec ff_gem_decoder = {
340 .name = "gem",
341 .long_name = NULL_IF_CONFIG_SMALL("GEM Raster image"),
342 .type = AVMEDIA_TYPE_VIDEO,
343 .id = AV_CODEC_ID_GEM,
344 .decode = gem_decode_frame,
345 .close = gem_close,
346 .capabilities = AV_CODEC_CAP_DR1,
347 };
348