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;
71 d = frame->data[0] + yl * frame->linesize[0];
74 for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
75 d[xl] |= (value >> j) & mask;
83 if (planel >= s->nb_planes)
85 value <<= bits_per_plane;
86 mask <<= bits_per_plane;
88 d = frame->data[0] + yl * frame->linesize[0];
99 static const uint8_t cga_mode45_index[6][4] = {
100 [0] = { 0, 3, 5, 7 }, // mode4, palette#1, low intensity
101 [1] = { 0, 2, 4, 6 }, // mode4, palette#2, low intensity
102 [2] = { 0, 3, 4, 7 }, // mode5, low intensity
103 [3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
104 [4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
105 [5] = { 0, 11, 12, 15 }, // mode5, high intensity
108 static int decode_frame(AVCodecContext *avctx,
109 void *data, int *got_frame,
112 PicContext *s = avctx->priv_data;
113 AVFrame *frame = data;
115 int bits_per_plane, bpp, etype, esize, npal, pos_after_pal;
116 int i, x, y, plane, tmp, ret, val;
118 bytestream2_init(&s->g, avpkt->data, avpkt->size);
120 if (bytestream2_get_bytes_left(&s->g) < 11)
121 return AVERROR_INVALIDDATA;
123 if (bytestream2_get_le16u(&s->g) != 0x1234)
124 return AVERROR_INVALIDDATA;
126 s->width = bytestream2_get_le16u(&s->g);
127 s->height = bytestream2_get_le16u(&s->g);
128 bytestream2_skip(&s->g, 4);
129 tmp = bytestream2_get_byteu(&s->g);
130 bits_per_plane = tmp & 0xF;
131 s->nb_planes = (tmp >> 4) + 1;
132 bpp = bits_per_plane * s->nb_planes;
133 if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
134 avpriv_request_sample(avctx, "Unsupported bit depth");
135 return AVERROR_PATCHWELCOME;
138 if (bytestream2_peek_byte(&s->g) == 0xFF || bpp == 1 || bpp == 4 || bpp == 8) {
139 bytestream2_skip(&s->g, 2);
140 etype = bytestream2_get_le16(&s->g);
141 esize = bytestream2_get_le16(&s->g);
142 if (bytestream2_get_bytes_left(&s->g) < esize)
143 return AVERROR_INVALIDDATA;
149 avctx->pix_fmt = AV_PIX_FMT_PAL8;
151 if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
153 if (s->width != avctx->width || s->height != avctx->height) {
154 ret = ff_set_dimensions(avctx, s->width, s->height);
159 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
161 memset(frame->data[0], 0, s->height * frame->linesize[0]);
162 frame->pict_type = AV_PICTURE_TYPE_I;
163 frame->palette_has_changed = 1;
165 pos_after_pal = bytestream2_tell(&s->g) + esize;
166 palette = (uint32_t*)frame->data[1];
167 if (etype == 1 && esize > 1 && bytestream2_peek_byte(&s->g) < 6) {
168 int idx = bytestream2_get_byte(&s->g);
170 for (i = 0; i < npal; i++)
171 palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ];
172 } else if (etype == 2) {
173 npal = FFMIN(esize, 16);
174 for (i = 0; i < npal; i++) {
175 int pal_idx = bytestream2_get_byte(&s->g);
176 palette[i] = ff_cga_palette[FFMIN(pal_idx, 15)];
178 } else if (etype == 3) {
179 npal = FFMIN(esize, 16);
180 for (i = 0; i < npal; i++) {
181 int pal_idx = bytestream2_get_byte(&s->g);
182 palette[i] = ff_ega_palette[FFMIN(pal_idx, 63)];
184 } else if (etype == 4 || etype == 5) {
185 npal = FFMIN(esize / 3, 256);
186 for (i = 0; i < npal; i++) {
187 palette[i] = bytestream2_get_be24(&s->g) << 2;
188 palette[i] |= 0xFFU << 24 | palette[i] >> 6 & 0x30303;
193 palette[0] = 0xFF000000;
194 palette[1] = 0xFFFFFFFF;
195 } else if (bpp == 2) {
197 for (i = 0; i < npal; i++)
198 palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
201 memcpy(palette, ff_cga_palette, npal * 4);
204 // fill remaining palette entries
205 memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
206 // skip remaining palette bytes
207 bytestream2_seek(&s->g, pos_after_pal, SEEK_SET);
211 if (bytestream2_get_le16(&s->g)) {
214 while (bytestream2_get_bytes_left(&s->g) >= 6) {
215 int stop_size, marker, t1, t2;
217 t1 = bytestream2_get_bytes_left(&s->g);
218 t2 = bytestream2_get_le16(&s->g);
219 stop_size = t1 - FFMIN(t1, t2);
220 // ignore uncompressed block size
221 bytestream2_skip(&s->g, 2);
222 marker = bytestream2_get_byte(&s->g);
224 while (plane < s->nb_planes &&
225 bytestream2_get_bytes_left(&s->g) > stop_size) {
227 val = bytestream2_get_byte(&s->g);
229 run = bytestream2_get_byte(&s->g);
231 run = bytestream2_get_le16(&s->g);
232 val = bytestream2_get_byte(&s->g);
234 if (!bytestream2_get_bytes_left(&s->g))
237 if (bits_per_plane == 8) {
238 picmemset_8bpp(s, frame, val, run, &x, &y);
242 picmemset(s, frame, val, run, &x, &y, &plane, bits_per_plane);
247 if (s->nb_planes - plane > 1)
248 return AVERROR_INVALIDDATA;
250 if (plane < s->nb_planes && x < avctx->width) {
251 int run = (y + 1) * avctx->width - x;
252 if (bits_per_plane == 8)
253 picmemset_8bpp(s, frame, val, run, &x, &y);
255 picmemset(s, frame, val, run / (8 / bits_per_plane), &x, &y, &plane, bits_per_plane);
258 while (y >= 0 && bytestream2_get_bytes_left(&s->g) > 0) {
259 memcpy(frame->data[0] + y * frame->linesize[0], s->g.buffer, FFMIN(avctx->width, bytestream2_get_bytes_left(&s->g)));
260 bytestream2_skip(&s->g, avctx->width);
270 AVCodec ff_pictor_decoder = {
272 .long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
273 .type = AVMEDIA_TYPE_VIDEO,
274 .id = AV_CODEC_ID_PICTOR,
275 .priv_data_size = sizeof(PicContext),
276 .decode = decode_frame,
277 .capabilities = AV_CODEC_CAP_DR1,