FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/pictordec.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 101 166 60.8%
Branches: 48 118 40.7%

Line Branch Exec Source
1 /*
2 * Pictor/PC Paint decoder
3 * Copyright (c) 2010 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 * Pictor/PC Paint decoder
25 */
26
27 #include "libavutil/imgutils.h"
28 #include "avcodec.h"
29 #include "bytestream.h"
30 #include "cga_data.h"
31 #include "internal.h"
32
33 typedef struct PicContext {
34 int width, height;
35 int nb_planes;
36 GetByteContext g;
37 } PicContext;
38
39 static void picmemset_8bpp(PicContext *s, AVFrame *frame, int value, int run,
40 int *x, int *y)
41 {
42 while (run > 0) {
43 uint8_t *d = frame->data[0] + *y * frame->linesize[0];
44 if (*x + run >= s->width) {
45 int n = s->width - *x;
46 memset(d + *x, value, n);
47 run -= n;
48 *x = 0;
49 *y -= 1;
50 if (*y < 0)
51 break;
52 } else {
53 memset(d + *x, value, run);
54 *x += run;
55 break;
56 }
57 }
58 }
59
60 46974 static void picmemset(PicContext *s, AVFrame *frame, unsigned value, int run,
61 int *x, int *y, int *plane, int bits_per_plane)
62 {
63 uint8_t *d;
64 46974 int shift = *plane * bits_per_plane;
65 46974 unsigned mask = ((1U << bits_per_plane) - 1) << shift;
66 46974 int xl = *x;
67 46974 int yl = *y;
68 46974 int planel = *plane;
69 46974 int pixels_per_value = 8/bits_per_plane;
70 46974 value <<= shift;
71
72 46974 d = frame->data[0] + yl * frame->linesize[0];
73
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111244 while (run > 0) {
74 int j;
75
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578446 for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
76 514176 d[xl] |= (value >> j) & mask;
77 514176 xl += 1;
78
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515822 while (xl == s->width) {
79 1648 yl -= 1;
80 1648 xl = 0;
81
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1648 if (yl < 0) {
82 8 yl = s->height - 1;
83 8 planel += 1;
84
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8 if (planel >= s->nb_planes)
85 2 goto end;
86 6 value <<= bits_per_plane;
87 6 mask <<= bits_per_plane;
88 }
89 1646 d = frame->data[0] + yl * frame->linesize[0];
90
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1646 if (s->nb_planes == 1 &&
91 run*pixels_per_value >= s->width &&
92 pixels_per_value < (s->width / pixels_per_value * pixels_per_value)
93 ) {
94 for (; xl < pixels_per_value; xl ++) {
95 j = (j < bits_per_plane ? 8 : j) - bits_per_plane;
96 d[xl] |= (value >> j) & mask;
97 }
98 av_memcpy_backptr(d+xl, pixels_per_value, s->width - xl);
99 run -= s->width / pixels_per_value;
100 xl = s->width / pixels_per_value * pixels_per_value;
101 }
102 }
103 }
104 64270 run--;
105 }
106 46972 end:
107 46974 *x = xl;
108 46974 *y = yl;
109 46974 *plane = planel;
110 46974 }
111
112 static const uint8_t cga_mode45_index[6][4] = {
113 [0] = { 0, 3, 5, 7 }, // mode4, palette#1, low intensity
114 [1] = { 0, 2, 4, 6 }, // mode4, palette#2, low intensity
115 [2] = { 0, 3, 4, 7 }, // mode5, low intensity
116 [3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
117 [4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
118 [5] = { 0, 11, 12, 15 }, // mode5, high intensity
119 };
120
121 2 static int decode_frame(AVCodecContext *avctx,
122 void *data, int *got_frame,
123 AVPacket *avpkt)
124 {
125 2 PicContext *s = avctx->priv_data;
126 2 AVFrame *frame = data;
127 uint32_t *palette;
128 int bits_per_plane, bpp, etype, esize, npal, pos_after_pal;
129 int i, x, y, plane, tmp, ret, val;
130
131 2 bytestream2_init(&s->g, avpkt->data, avpkt->size);
132
133
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2 if (bytestream2_get_bytes_left(&s->g) < 11)
134 return AVERROR_INVALIDDATA;
135
136
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2 if (bytestream2_get_le16u(&s->g) != 0x1234)
137 return AVERROR_INVALIDDATA;
138
139 2 s->width = bytestream2_get_le16u(&s->g);
140 2 s->height = bytestream2_get_le16u(&s->g);
141 2 bytestream2_skip(&s->g, 4);
142 2 tmp = bytestream2_get_byteu(&s->g);
143 2 bits_per_plane = tmp & 0xF;
144 2 s->nb_planes = (tmp >> 4) + 1;
145 2 bpp = bits_per_plane * s->nb_planes;
146
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2 if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
147 avpriv_request_sample(avctx, "Unsupported bit depth");
148 return AVERROR_PATCHWELCOME;
149 }
150
151
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2 if (bytestream2_peek_byte(&s->g) == 0xFF || bpp == 1 || bpp == 4 || bpp == 8) {
152 2 bytestream2_skip(&s->g, 2);
153 2 etype = bytestream2_get_le16(&s->g);
154 2 esize = bytestream2_get_le16(&s->g);
155
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2 if (bytestream2_get_bytes_left(&s->g) < esize)
156 return AVERROR_INVALIDDATA;
157 } else {
158 etype = -1;
159 esize = 0;
160 }
161
162 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
163
164
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2 if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
165 return -1;
166
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2 if (s->width != avctx->width || s->height != avctx->height) {
167 1 ret = ff_set_dimensions(avctx, s->width, s->height);
168
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1 if (ret < 0)
169 return ret;
170 }
171
172
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2 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
173 return ret;
174 2 memset(frame->data[0], 0, s->height * frame->linesize[0]);
175 2 frame->pict_type = AV_PICTURE_TYPE_I;
176 2 frame->palette_has_changed = 1;
177
178 2 pos_after_pal = bytestream2_tell(&s->g) + esize;
179 2 palette = (uint32_t*)frame->data[1];
180
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2 if (etype == 1 && esize > 1 && bytestream2_peek_byte(&s->g) < 6) {
181 int idx = bytestream2_get_byte(&s->g);
182 npal = 4;
183 for (i = 0; i < npal; i++)
184 palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ];
185
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2 } else if (etype == 2) {
186 npal = FFMIN(esize, 16);
187 for (i = 0; i < npal; i++) {
188 int pal_idx = bytestream2_get_byte(&s->g);
189 palette[i] = ff_cga_palette[FFMIN(pal_idx, 15)];
190 }
191
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2 } else if (etype == 3) {
192 npal = FFMIN(esize, 16);
193 for (i = 0; i < npal; i++) {
194 int pal_idx = bytestream2_get_byte(&s->g);
195 palette[i] = ff_ega_palette[FFMIN(pal_idx, 63)];
196 }
197
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2 } else if (etype == 4 || etype == 5) {
198
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2 npal = FFMIN(esize / 3, 256);
199
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34 for (i = 0; i < npal; i++) {
200 32 palette[i] = bytestream2_get_be24(&s->g) << 2;
201 32 palette[i] |= 0xFFU << 24 | palette[i] >> 6 & 0x30303;
202 }
203 } else {
204 if (bpp == 1) {
205 npal = 2;
206 palette[0] = 0xFF000000;
207 palette[1] = 0xFFFFFFFF;
208 } else if (bpp == 2) {
209 npal = 4;
210 for (i = 0; i < npal; i++)
211 palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
212 } else {
213 npal = 16;
214 memcpy(palette, ff_cga_palette, npal * 4);
215 }
216 }
217 // fill remaining palette entries
218 2 memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
219 // skip remaining palette bytes
220 2 bytestream2_seek(&s->g, pos_after_pal, SEEK_SET);
221
222 2 val = 0;
223 2 y = s->height - 1;
224
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2 if (bytestream2_get_le16(&s->g)) {
225 2 x = 0;
226 2 plane = 0;
227
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10 while (bytestream2_get_bytes_left(&s->g) >= 6) {
228 int stop_size, marker, t1, t2;
229
230 8 t1 = bytestream2_get_bytes_left(&s->g);
231 8 t2 = bytestream2_get_le16(&s->g);
232 8 stop_size = t1 - FFMIN(t1, t2);
233 // ignore uncompressed block size
234 8 bytestream2_skip(&s->g, 2);
235 8 marker = bytestream2_get_byte(&s->g);
236
237
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93960 while (plane < s->nb_planes &&
238 46980 bytestream2_get_bytes_left(&s->g) > stop_size) {
239 46974 int run = 1;
240 46974 val = bytestream2_get_byte(&s->g);
241
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46974 if (val == marker) {
242 2136 run = bytestream2_get_byte(&s->g);
243
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2136 if (run == 0)
244 run = bytestream2_get_le16(&s->g);
245 2136 val = bytestream2_get_byte(&s->g);
246 }
247
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46974 if (!bytestream2_get_bytes_left(&s->g))
248 2 break;
249
250
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46972 if (bits_per_plane == 8) {
251 picmemset_8bpp(s, frame, val, run, &x, &y);
252 if (y < 0)
253 goto finish;
254 } else {
255 46972 picmemset(s, frame, val, run, &x, &y, &plane, bits_per_plane);
256 }
257 }
258 }
259
260
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2 if (s->nb_planes - plane > 1)
261 return AVERROR_INVALIDDATA;
262
263
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2 if (plane < s->nb_planes && x < avctx->width) {
264 2 int run = (y + 1) * avctx->width - x;
265
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2 if (bits_per_plane == 8)
266 picmemset_8bpp(s, frame, val, run, &x, &y);
267 else
268 2 picmemset(s, frame, val, run / (8 / bits_per_plane), &x, &y, &plane, bits_per_plane);
269 }
270 } else {
271 while (y >= 0 && bytestream2_get_bytes_left(&s->g) > 0) {
272 memcpy(frame->data[0] + y * frame->linesize[0], s->g.buffer, FFMIN(avctx->width, bytestream2_get_bytes_left(&s->g)));
273 bytestream2_skip(&s->g, avctx->width);
274 y--;
275 }
276 }
277 finish:
278
279 2 *got_frame = 1;
280 2 return avpkt->size;
281 }
282
283 const AVCodec ff_pictor_decoder = {
284 .name = "pictor",
285 .long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
286 .type = AVMEDIA_TYPE_VIDEO,
287 .id = AV_CODEC_ID_PICTOR,
288 .priv_data_size = sizeof(PicContext),
289 .decode = decode_frame,
290 .capabilities = AV_CODEC_CAP_DR1,
291 };
292