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"
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, int value, int run,
61 int *x, int *y, int *plane, int bits_per_plane)
64 int shift = *plane * bits_per_plane;
65 int mask = ((1 << bits_per_plane) - 1) << shift;
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;
80 value <<= bits_per_plane;
81 mask <<= bits_per_plane;
82 if (*plane >= s->nb_planes)
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
100 static int decode_frame(AVCodecContext *avctx,
101 void *data, int *got_frame,
104 PicContext *s = avctx->priv_data;
105 AVFrame *frame = data;
107 int bits_per_plane, bpp, etype, esize, npal, pos_after_pal;
108 int i, x, y, plane, tmp, ret;
110 bytestream2_init(&s->g, avpkt->data, avpkt->size);
112 if (bytestream2_get_bytes_left(&s->g) < 11)
113 return AVERROR_INVALIDDATA;
115 if (bytestream2_get_le16u(&s->g) != 0x1234)
116 return AVERROR_INVALIDDATA;
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(s, "Unsupported bit depth");
127 return AVERROR_PATCHWELCOME;
130 if (bytestream2_peek_byte(&s->g) == 0xFF) {
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;
141 avctx->pix_fmt = AV_PIX_FMT_PAL8;
143 if (s->width != avctx->width && s->height != avctx->height) {
144 if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
146 avcodec_set_dimensions(avctx, s->width, s->height);
149 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
150 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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;
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);
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, frame, val, run, &x, &y);
231 picmemset(s, frame, val, run, &x, &y, &plane, bits_per_plane);
236 avpriv_request_sample(s, "Uncompressed image");
244 AVCodec ff_pictor_decoder = {
246 .type = AVMEDIA_TYPE_VIDEO,
247 .id = AV_CODEC_ID_PICTOR,
248 .priv_data_size = sizeof(PicContext),
249 .decode = decode_frame,
250 .capabilities = CODEC_CAP_DR1,
251 .long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),