2 * Pictor/PC Paint decoder
3 * Copyright (c) 2010 Peter Ross <pross@xvid.org>
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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"
32 typedef struct PicContext {
39 static void picmemset_8bpp(PicContext *s, int value, int run, int *x, int *y)
42 uint8_t *d = s->frame.data[0] + *y * s->frame.linesize[0];
43 if (*x + run >= s->width) {
44 int n = s->width - *x;
45 memset(d + *x, value, n);
52 memset(d + *x, value, run);
59 static void picmemset(PicContext *s, int value, int run,
60 int *x, int *y, int *plane, int bits_per_plane)
63 int shift = *plane * bits_per_plane;
64 int mask = ((1 << bits_per_plane) - 1) << shift;
69 for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
70 d = s->frame.data[0] + *y * s->frame.linesize[0];
71 d[*x] |= (value >> j) & mask;
79 value <<= bits_per_plane;
80 mask <<= bits_per_plane;
81 if (*plane >= s->nb_planes)
90 static const uint8_t cga_mode45_index[6][4] = {
91 [0] = { 0, 3, 5, 7 }, // mode4, palette#1, low intensity
92 [1] = { 0, 2, 4, 6 }, // mode4, palette#2, low intensity
93 [2] = { 0, 3, 4, 7 }, // mode5, low intensity
94 [3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
95 [4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
96 [5] = { 0, 11, 12, 15 }, // mode5, high intensity
99 static int decode_frame(AVCodecContext *avctx,
100 void *data, int *data_size,
103 PicContext *s = avctx->priv_data;
105 int bits_per_plane, bpp, etype, esize, npal, pos_after_pal;
106 int i, x, y, plane, tmp;
108 bytestream2_init(&s->g, avpkt->data, avpkt->size);
110 if (bytestream2_get_bytes_left(&s->g) < 11)
111 return AVERROR_INVALIDDATA;
113 if (bytestream2_get_le16u(&s->g) != 0x1234)
114 return AVERROR_INVALIDDATA;
116 s->width = bytestream2_get_le16u(&s->g);
117 s->height = bytestream2_get_le16u(&s->g);
118 bytestream2_skip(&s->g, 4);
119 tmp = bytestream2_get_byteu(&s->g);
120 bits_per_plane = tmp & 0xF;
121 s->nb_planes = (tmp >> 4) + 1;
122 bpp = bits_per_plane * s->nb_planes;
123 if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
124 av_log_ask_for_sample(s, "unsupported bit depth\n");
125 return AVERROR_INVALIDDATA;
128 if (bytestream2_peek_byte(&s->g) == 0xFF) {
129 bytestream2_skip(&s->g, 2);
130 etype = bytestream2_get_le16(&s->g);
131 esize = bytestream2_get_le16(&s->g);
132 if (bytestream2_get_bytes_left(&s->g) < esize)
133 return AVERROR_INVALIDDATA;
139 avctx->pix_fmt = PIX_FMT_PAL8;
141 if (s->width != avctx->width && s->height != avctx->height) {
142 if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
144 avcodec_set_dimensions(avctx, s->width, s->height);
145 if (s->frame.data[0])
146 avctx->release_buffer(avctx, &s->frame);
149 if (avctx->get_buffer(avctx, &s->frame) < 0){
150 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
153 memset(s->frame.data[0], 0, s->height * s->frame.linesize[0]);
154 s->frame.pict_type = AV_PICTURE_TYPE_I;
155 s->frame.palette_has_changed = 1;
157 pos_after_pal = bytestream2_tell(&s->g) + esize;
158 palette = (uint32_t*)s->frame.data[1];
159 if (etype == 1 && esize > 1 && bytestream2_peek_byte(&s->g) < 6) {
160 int idx = bytestream2_get_byte(&s->g);
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, 16)];
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)];
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;
183 palette[0] = 0x000000;
184 palette[1] = 0xFFFFFF;
185 } else if (bpp == 2) {
187 for (i = 0; i < npal; i++)
188 palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
191 memcpy(palette, ff_cga_palette, npal * 4);
194 // fill remaining palette entries
195 memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
196 // skip remaining palette bytes
197 bytestream2_seek(&s->g, pos_after_pal, SEEK_SET);
202 if (bytestream2_get_le16(&s->g)) {
203 while (bytestream2_get_bytes_left(&s->g) >= 6) {
204 int stop_size, marker, t1, t2;
206 t1 = bytestream2_get_bytes_left(&s->g);
207 t2 = bytestream2_get_le16(&s->g);
208 stop_size = t1 - FFMIN(t1, t2);
209 // ignore uncompressed block size
210 bytestream2_skip(&s->g, 2);
211 marker = bytestream2_get_byte(&s->g);
213 while (plane < s->nb_planes &&
214 bytestream2_get_bytes_left(&s->g) > stop_size) {
216 int val = bytestream2_get_byte(&s->g);
218 run = bytestream2_get_byte(&s->g);
220 run = bytestream2_get_le16(&s->g);
221 val = bytestream2_get_byte(&s->g);
223 if (!bytestream2_get_bytes_left(&s->g))
226 if (bits_per_plane == 8) {
227 picmemset_8bpp(s, val, run, &x, &y);
231 picmemset(s, val, run, &x, &y, &plane, bits_per_plane);
236 av_log_ask_for_sample(s, "uncompressed image\n");
240 *data_size = sizeof(AVFrame);
241 *(AVFrame*)data = s->frame;
245 static av_cold int decode_end(AVCodecContext *avctx)
247 PicContext *s = avctx->priv_data;
248 if (s->frame.data[0])
249 avctx->release_buffer(avctx, &s->frame);
253 AVCodec ff_pictor_decoder = {
255 .type = AVMEDIA_TYPE_VIDEO,
256 .id = CODEC_ID_PICTOR,
257 .priv_data_size = sizeof(PicContext),
259 .decode = decode_frame,
260 .capabilities = CODEC_CAP_DR1,
261 .long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),