Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / pictordec.c
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 static void picmemset(PicContext *s, AVFrame *frame, int value, int run,
61 int *x, int *y, int *plane, int bits_per_plane)
62 {
63 uint8_t *d;
64 int shift = *plane * bits_per_plane;
65 int mask = ((1 << bits_per_plane) - 1) << shift;
66 value <<= shift;
67
68 while (run > 0) {
69 int j;
70 for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
71 d = frame->data[0] + *y * frame->linesize[0];
72 d[*x] |= (value >> j) & mask;
73 *x += 1;
74 if (*x == s->width) {
75 *y -= 1;
76 *x = 0;
77 if (*y < 0) {
78 *y = s->height - 1;
79 *plane += 1;
80 value <<= bits_per_plane;
81 mask <<= bits_per_plane;
82 if (*plane >= s->nb_planes)
83 break;
84 }
85 }
86 }
87 run--;
88 }
89 }
90
91 static const uint8_t cga_mode45_index[6][4] = {
92 [0] = { 0, 3, 5, 7 }, // mode4, palette#1, low intensity
93 [1] = { 0, 2, 4, 6 }, // mode4, palette#2, low intensity
94 [2] = { 0, 3, 4, 7 }, // mode5, low intensity
95 [3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
96 [4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
97 [5] = { 0, 11, 12, 15 }, // mode5, high intensity
98 };
99
100 static int decode_frame(AVCodecContext *avctx,
101 void *data, int *got_frame,
102 AVPacket *avpkt)
103 {
104 PicContext *s = avctx->priv_data;
105 AVFrame *frame = data;
106 uint32_t *palette;
107 int bits_per_plane, bpp, etype, esize, npal, pos_after_pal;
108 int i, x, y, plane, tmp, ret, val;
109
110 bytestream2_init(&s->g, avpkt->data, avpkt->size);
111
112 if (bytestream2_get_bytes_left(&s->g) < 11)
113 return AVERROR_INVALIDDATA;
114
115 if (bytestream2_get_le16u(&s->g) != 0x1234)
116 return AVERROR_INVALIDDATA;
117
118 s->width = bytestream2_get_le16u(&s->g);
119 s->height = bytestream2_get_le16u(&s->g);
120 bytestream2_skip(&s->g, 4);
121 tmp = bytestream2_get_byteu(&s->g);
122 bits_per_plane = tmp & 0xF;
123 s->nb_planes = (tmp >> 4) + 1;
124 bpp = bits_per_plane * s->nb_planes;
125 if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
126 avpriv_request_sample(avctx, "Unsupported bit depth");
127 return AVERROR_PATCHWELCOME;
128 }
129
130 if (bytestream2_peek_byte(&s->g) == 0xFF || bpp == 1 || bpp == 4 || bpp == 8) {
131 bytestream2_skip(&s->g, 2);
132 etype = bytestream2_get_le16(&s->g);
133 esize = bytestream2_get_le16(&s->g);
134 if (bytestream2_get_bytes_left(&s->g) < esize)
135 return AVERROR_INVALIDDATA;
136 } else {
137 etype = -1;
138 esize = 0;
139 }
140
141 avctx->pix_fmt = AV_PIX_FMT_PAL8;
142
143 if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
144 return -1;
145 if (s->width != avctx->width && s->height != avctx->height) {
146 ret = ff_set_dimensions(avctx, s->width, s->height);
147 if (ret < 0)
148 return ret;
149 }
150
151 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
152 return ret;
153 memset(frame->data[0], 0, s->height * frame->linesize[0]);
154 frame->pict_type = AV_PICTURE_TYPE_I;
155 frame->palette_has_changed = 1;
156
157 pos_after_pal = bytestream2_tell(&s->g) + esize;
158 palette = (uint32_t*)frame->data[1];
159 if (etype == 1 && esize > 1 && bytestream2_peek_byte(&s->g) < 6) {
160 int idx = bytestream2_get_byte(&s->g);
161 npal = 4;
162 for (i = 0; i < npal; i++)
163 palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ];
164 } else if (etype == 2) {
165 npal = FFMIN(esize, 16);
166 for (i = 0; i < npal; i++) {
167 int pal_idx = bytestream2_get_byte(&s->g);
168 palette[i] = ff_cga_palette[FFMIN(pal_idx, 15)];
169 }
170 } else if (etype == 3) {
171 npal = FFMIN(esize, 16);
172 for (i = 0; i < npal; i++) {
173 int pal_idx = bytestream2_get_byte(&s->g);
174 palette[i] = ff_ega_palette[FFMIN(pal_idx, 63)];
175 }
176 } else if (etype == 4 || etype == 5) {
177 npal = FFMIN(esize / 3, 256);
178 for (i = 0; i < npal; i++) {
179 palette[i] = bytestream2_get_be24(&s->g) << 2;
180 palette[i] |= 0xFFU << 24 | palette[i] >> 6 & 0x30303;
181 }
182 } else {
183 if (bpp == 1) {
184 npal = 2;
185 palette[0] = 0xFF000000;
186 palette[1] = 0xFFFFFFFF;
187 } else if (bpp == 2) {
188 npal = 4;
189 for (i = 0; i < npal; i++)
190 palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
191 } else {
192 npal = 16;
193 memcpy(palette, ff_cga_palette, npal * 4);
194 }
195 }
196 // fill remaining palette entries
197 memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
198 // skip remaining palette bytes
199 bytestream2_seek(&s->g, pos_after_pal, SEEK_SET);
200
201 val = 0;
202 y = s->height - 1;
203 if (bytestream2_get_le16(&s->g)) {
204 x = 0;
205 plane = 0;
206 while (bytestream2_get_bytes_left(&s->g) >= 6) {
207 int stop_size, marker, t1, t2;
208
209 t1 = bytestream2_get_bytes_left(&s->g);
210 t2 = bytestream2_get_le16(&s->g);
211 stop_size = t1 - FFMIN(t1, t2);
212 // ignore uncompressed block size
213 bytestream2_skip(&s->g, 2);
214 marker = bytestream2_get_byte(&s->g);
215
216 while (plane < s->nb_planes &&
217 bytestream2_get_bytes_left(&s->g) > stop_size) {
218 int run = 1;
219 val = bytestream2_get_byte(&s->g);
220 if (val == marker) {
221 run = bytestream2_get_byte(&s->g);
222 if (run == 0)
223 run = bytestream2_get_le16(&s->g);
224 val = bytestream2_get_byte(&s->g);
225 }
226 if (!bytestream2_get_bytes_left(&s->g))
227 break;
228
229 if (bits_per_plane == 8) {
230 picmemset_8bpp(s, frame, val, run, &x, &y);
231 if (y < 0)
232 goto finish;
233 } else {
234 picmemset(s, frame, val, run, &x, &y, &plane, bits_per_plane);
235 }
236 }
237 }
238
239 if (x < avctx->width) {
240 int run = (y + 1) * avctx->width - x;
241 if (bits_per_plane == 8)
242 picmemset_8bpp(s, frame, val, run, &x, &y);
243 else
244 picmemset(s, frame, val, run / (8 / bits_per_plane), &x, &y, &plane, bits_per_plane);
245 }
246 } else {
247 while (y >= 0 && bytestream2_get_bytes_left(&s->g) > 0) {
248 memcpy(frame->data[0] + y * frame->linesize[0], s->g.buffer, FFMIN(avctx->width, bytestream2_get_bytes_left(&s->g)));
249 bytestream2_skip(&s->g, avctx->width);
250 y--;
251 }
252 }
253 finish:
254
255 *got_frame = 1;
256 return avpkt->size;
257 }
258
259 AVCodec ff_pictor_decoder = {
260 .name = "pictor",
261 .long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
262 .type = AVMEDIA_TYPE_VIDEO,
263 .id = AV_CODEC_ID_PICTOR,
264 .priv_data_size = sizeof(PicContext),
265 .decode = decode_frame,
266 .capabilities = CODEC_CAP_DR1,
267 };