2 * Pictor/PC Paint decoder
3 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
5 * This file is part of FFmpeg.
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.
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.
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
24 * Pictor/PC Paint decoder
27 #include "libavutil/imgutils.h"
29 #include "bytestream.h"
33 typedef struct PicContext {
39 static void picmemset_8bpp(PicContext *s, AVFrame *frame, int value, int run,
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);
53 memset(d + *x, value, run);
60 static void picmemset(PicContext *s, AVFrame *frame, unsigned value, int run,
61 int *x, int *y, int *plane, int bits_per_plane)
64 int shift = *plane * bits_per_plane;
65 unsigned mask = ((1U << bits_per_plane) - 1) << shift;
73 for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
74 d = frame->data[0] + yl * frame->linesize[0];
75 d[xl] |= (value >> j) & mask;
83 if (planel >= s->nb_planes)
85 value <<= bits_per_plane;
86 mask <<= bits_per_plane;
98 static const uint8_t cga_mode45_index[6][4] = {
99 [0] = { 0, 3, 5, 7 }, // mode4, palette#1, low intensity
100 [1] = { 0, 2, 4, 6 }, // mode4, palette#2, low intensity
101 [2] = { 0, 3, 4, 7 }, // mode5, low intensity
102 [3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
103 [4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
104 [5] = { 0, 11, 12, 15 }, // mode5, high intensity
107 static int decode_frame(AVCodecContext *avctx,
108 void *data, int *got_frame,
111 PicContext *s = avctx->priv_data;
112 AVFrame *frame = data;
114 int bits_per_plane, bpp, etype, esize, npal, pos_after_pal;
115 int i, x, y, plane, tmp, ret, val;
117 bytestream2_init(&s->g, avpkt->data, avpkt->size);
119 if (bytestream2_get_bytes_left(&s->g) < 11)
120 return AVERROR_INVALIDDATA;
122 if (bytestream2_get_le16u(&s->g) != 0x1234)
123 return AVERROR_INVALIDDATA;
125 s->width = bytestream2_get_le16u(&s->g);
126 s->height = bytestream2_get_le16u(&s->g);
127 bytestream2_skip(&s->g, 4);
128 tmp = bytestream2_get_byteu(&s->g);
129 bits_per_plane = tmp & 0xF;
130 s->nb_planes = (tmp >> 4) + 1;
131 bpp = bits_per_plane * s->nb_planes;
132 if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
133 avpriv_request_sample(avctx, "Unsupported bit depth");
134 return AVERROR_PATCHWELCOME;
137 if (bytestream2_peek_byte(&s->g) == 0xFF || bpp == 1 || bpp == 4 || bpp == 8) {
138 bytestream2_skip(&s->g, 2);
139 etype = bytestream2_get_le16(&s->g);
140 esize = bytestream2_get_le16(&s->g);
141 if (bytestream2_get_bytes_left(&s->g) < esize)
142 return AVERROR_INVALIDDATA;
148 avctx->pix_fmt = AV_PIX_FMT_PAL8;
150 if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
152 if (s->width != avctx->width || s->height != avctx->height) {
153 ret = ff_set_dimensions(avctx, s->width, s->height);
158 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
160 memset(frame->data[0], 0, s->height * frame->linesize[0]);
161 frame->pict_type = AV_PICTURE_TYPE_I;
162 frame->palette_has_changed = 1;
164 pos_after_pal = bytestream2_tell(&s->g) + esize;
165 palette = (uint32_t*)frame->data[1];
166 if (etype == 1 && esize > 1 && bytestream2_peek_byte(&s->g) < 6) {
167 int idx = bytestream2_get_byte(&s->g);
169 for (i = 0; i < npal; i++)
170 palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ];
171 } else if (etype == 2) {
172 npal = FFMIN(esize, 16);
173 for (i = 0; i < npal; i++) {
174 int pal_idx = bytestream2_get_byte(&s->g);
175 palette[i] = ff_cga_palette[FFMIN(pal_idx, 15)];
177 } else if (etype == 3) {
178 npal = FFMIN(esize, 16);
179 for (i = 0; i < npal; i++) {
180 int pal_idx = bytestream2_get_byte(&s->g);
181 palette[i] = ff_ega_palette[FFMIN(pal_idx, 63)];
183 } else if (etype == 4 || etype == 5) {
184 npal = FFMIN(esize / 3, 256);
185 for (i = 0; i < npal; i++) {
186 palette[i] = bytestream2_get_be24(&s->g) << 2;
187 palette[i] |= 0xFFU << 24 | palette[i] >> 6 & 0x30303;
192 palette[0] = 0xFF000000;
193 palette[1] = 0xFFFFFFFF;
194 } else if (bpp == 2) {
196 for (i = 0; i < npal; i++)
197 palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
200 memcpy(palette, ff_cga_palette, npal * 4);
203 // fill remaining palette entries
204 memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
205 // skip remaining palette bytes
206 bytestream2_seek(&s->g, pos_after_pal, SEEK_SET);
210 if (bytestream2_get_le16(&s->g)) {
213 while (bytestream2_get_bytes_left(&s->g) >= 6) {
214 int stop_size, marker, t1, t2;
216 t1 = bytestream2_get_bytes_left(&s->g);
217 t2 = bytestream2_get_le16(&s->g);
218 stop_size = t1 - FFMIN(t1, t2);
219 // ignore uncompressed block size
220 bytestream2_skip(&s->g, 2);
221 marker = bytestream2_get_byte(&s->g);
223 while (plane < s->nb_planes &&
224 bytestream2_get_bytes_left(&s->g) > stop_size) {
226 val = bytestream2_get_byte(&s->g);
228 run = bytestream2_get_byte(&s->g);
230 run = bytestream2_get_le16(&s->g);
231 val = bytestream2_get_byte(&s->g);
233 if (!bytestream2_get_bytes_left(&s->g))
236 if (bits_per_plane == 8) {
237 picmemset_8bpp(s, frame, val, run, &x, &y);
241 picmemset(s, frame, val, run, &x, &y, &plane, bits_per_plane);
246 if (s->nb_planes - plane > 1)
247 return AVERROR_INVALIDDATA;
249 if (plane < s->nb_planes && x < avctx->width) {
250 int run = (y + 1) * avctx->width - x;
251 if (bits_per_plane == 8)
252 picmemset_8bpp(s, frame, val, run, &x, &y);
254 picmemset(s, frame, val, run / (8 / bits_per_plane), &x, &y, &plane, bits_per_plane);
257 while (y >= 0 && bytestream2_get_bytes_left(&s->g) > 0) {
258 memcpy(frame->data[0] + y * frame->linesize[0], s->g.buffer, FFMIN(avctx->width, bytestream2_get_bytes_left(&s->g)));
259 bytestream2_skip(&s->g, avctx->width);
269 AVCodec ff_pictor_decoder = {
271 .long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
272 .type = AVMEDIA_TYPE_VIDEO,
273 .id = AV_CODEC_ID_PICTOR,
274 .priv_data_size = sizeof(PicContext),
275 .decode = decode_frame,
276 .capabilities = AV_CODEC_CAP_DR1,