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"
32 typedef struct PicContext {
38 static void picmemset_8bpp(PicContext *s, int value, int run, int *x, int *y)
41 uint8_t *d = s->frame.data[0] + *y * s->frame.linesize[0];
42 if (*x + run >= s->width) {
43 int n = s->width - *x;
44 memset(d + *x, value, n);
51 memset(d + *x, value, run);
58 static void picmemset(PicContext *s, int value, int run, int *x, int *y, int *plane, int bits_per_plane)
61 int shift = *plane * bits_per_plane;
62 int mask = ((1 << bits_per_plane) - 1) << shift;
67 for (j = 8-bits_per_plane; j >= 0; j -= bits_per_plane) {
68 d = s->frame.data[0] + *y * s->frame.linesize[0];
69 d[*x] |= (value >> j) & mask;
77 value <<= bits_per_plane;
78 mask <<= bits_per_plane;
79 if (*plane >= s->nb_planes)
88 static const uint8_t cga_mode45_index[6][4] = {
89 [0] = { 0, 3, 5, 7 }, // mode4, palette#1, low intensity
90 [1] = { 0, 2, 4, 6 }, // mode4, palette#2, low intensity
91 [2] = { 0, 3, 4, 7 }, // mode5, low intensity
92 [3] = { 0, 11, 13, 15 }, // mode4, palette#1, high intensity
93 [4] = { 0, 10, 12, 14 }, // mode4, palette#2, high intensity
94 [5] = { 0, 11, 12, 15 }, // mode5, high intensity
97 static av_cold int decode_init(AVCodecContext *avctx)
99 PicContext *s = avctx->priv_data;
101 avcodec_get_frame_defaults(&s->frame);
105 static int decode_frame(AVCodecContext *avctx,
106 void *data, int *data_size,
109 PicContext *s = avctx->priv_data;
110 int buf_size = avpkt->size;
111 const uint8_t *buf = avpkt->data;
112 const uint8_t *buf_end = avpkt->data + buf_size;
114 int bits_per_plane, bpp, etype, esize, npal;
118 return AVERROR_INVALIDDATA;
120 if (bytestream_get_le16(&buf) != 0x1234)
121 return AVERROR_INVALIDDATA;
122 s->width = bytestream_get_le16(&buf);
123 s->height = bytestream_get_le16(&buf);
125 bits_per_plane = *buf & 0xF;
126 s->nb_planes = (*buf++ >> 4) + 1;
127 bpp = s->nb_planes ? bits_per_plane*s->nb_planes : bits_per_plane;
128 if (bits_per_plane > 8 || bpp < 1 || bpp > 32) {
129 av_log_ask_for_sample(s, "unsupported bit depth\n");
130 return AVERROR_INVALIDDATA;
135 etype = bytestream_get_le16(&buf);
136 esize = bytestream_get_le16(&buf);
137 if (buf_end - buf < esize)
138 return AVERROR_INVALIDDATA;
144 avctx->pix_fmt = PIX_FMT_PAL8;
146 if (s->width != avctx->width && s->height != avctx->height) {
147 if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
149 avcodec_set_dimensions(avctx, s->width, s->height);
150 if (s->frame.data[0])
151 avctx->release_buffer(avctx, &s->frame);
154 if (avctx->get_buffer(avctx, &s->frame) < 0){
155 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
158 memset(s->frame.data[0], 0, s->height * s->frame.linesize[0]);
159 s->frame.pict_type = AV_PICTURE_TYPE_I;
160 s->frame.palette_has_changed = 1;
162 palette = (uint32_t*)s->frame.data[1];
163 if (etype == 1 && esize > 1 && *buf < 6) {
166 for (i = 0; i < npal; i++)
167 palette[i] = ff_cga_palette[ cga_mode45_index[idx][i] ];
168 } else if (etype == 2) {
169 npal = FFMIN(esize, 16);
170 for (i = 0; i < npal; i++)
171 palette[i] = ff_cga_palette[ FFMIN(buf[i], 16)];
172 } else if (etype == 3) {
173 npal = FFMIN(esize, 16);
174 for (i = 0; i < npal; i++)
175 palette[i] = ff_ega_palette[ FFMIN(buf[i], 63)];
176 } else if (etype == 4 || etype == 5) {
177 npal = FFMIN(esize / 3, 256);
178 for (i = 0; i < npal; i++) {
179 palette[i] = AV_RB24(buf + i*3) << 2;
180 palette[i] |= 0xFF << 24 | palette[i] >> 6 & 0x30303;
185 palette[0] = 0xFF000000;
186 palette[1] = 0xFFFFFFFF;
187 } else if (bpp == 2) {
189 for (i = 0; i < npal; i++)
190 palette[i] = ff_cga_palette[ cga_mode45_index[0][i] ];
193 memcpy(palette, ff_cga_palette, npal * 4);
196 // fill remaining palette entries
197 memset(palette + npal, 0, AVPALETTE_SIZE - npal * 4);
204 if (bytestream_get_le16(&buf)) {
205 while (buf_end - buf >= 6) {
206 const uint8_t *buf_pend = buf + FFMIN(AV_RL16(buf), buf_end - buf);
207 //ignore uncompressed block size reported at buf[2]
211 while (plane < s->nb_planes && buf_pend - buf >= 1) {
217 run = bytestream_get_le16(&buf);
223 if (bits_per_plane == 8) {
224 picmemset_8bpp(s, val, run, &x, &y);
228 picmemset(s, val, run, &x, &y, &plane, bits_per_plane);
233 av_log_ask_for_sample(avctx, "uncompressed image\n");
237 *data_size = sizeof(AVFrame);
238 *(AVFrame*)data = s->frame;
242 static av_cold int decode_end(AVCodecContext *avctx)
244 PicContext *s = avctx->priv_data;
245 if (s->frame.data[0])
246 avctx->release_buffer(avctx, &s->frame);
250 AVCodec ff_pictor_decoder = {
252 .type = AVMEDIA_TYPE_VIDEO,
253 .id = CODEC_ID_PICTOR,
254 .priv_data_size = sizeof(PicContext),
257 .decode = decode_frame,
258 .capabilities = CODEC_CAP_DR1,
259 .long_name = NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),