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
, 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
, val
;
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(avctx
, "Unsupported bit depth");
127 return AVERROR_PATCHWELCOME
;
130 if (bytestream2_peek_byte(&s
->g
) == 0xFF || bpp
== 1 || bpp
== 4 || bpp
== 8) {
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 (av_image_check_size(s
->width
, s
->height
, 0, avctx
) < 0)
145 if (s
->width
!= avctx
->width
&& s
->height
!= avctx
->height
) {
146 ret
= ff_set_dimensions(avctx
, s
->width
, s
->height
);
151 if ((ret
= ff_get_buffer(avctx
, frame
, 0)) < 0)
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
, 15)];
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;
180 palette
[i
] |= 0xFFU
<< 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);
198 // skip remaining palette bytes
199 bytestream2_seek(&s
->g
, pos_after_pal
, SEEK_SET
);
203 if (bytestream2_get_le16(&s
->g
)) {
206 while (bytestream2_get_bytes_left(&s
->g
) >= 6) {
207 int stop_size
, marker
, t1
, t2
;
209 t1
= bytestream2_get_bytes_left(&s
->g
);
210 t2
= bytestream2_get_le16(&s
->g
);
211 stop_size
= t1
- FFMIN(t1
, t2
);
212 // ignore uncompressed block size
213 bytestream2_skip(&s
->g
, 2);
214 marker
= bytestream2_get_byte(&s
->g
);
216 while (plane
< s
->nb_planes
&&
217 bytestream2_get_bytes_left(&s
->g
) > stop_size
) {
219 val
= bytestream2_get_byte(&s
->g
);
221 run
= bytestream2_get_byte(&s
->g
);
223 run
= bytestream2_get_le16(&s
->g
);
224 val
= bytestream2_get_byte(&s
->g
);
226 if (!bytestream2_get_bytes_left(&s
->g
))
229 if (bits_per_plane
== 8) {
230 picmemset_8bpp(s
, frame
, val
, run
, &x
, &y
);
234 picmemset(s
, frame
, val
, run
, &x
, &y
, &plane
, bits_per_plane
);
239 if (x
< avctx
->width
) {
240 int run
= (y
+ 1) * avctx
->width
- x
;
241 if (bits_per_plane
== 8)
242 picmemset_8bpp(s
, frame
, val
, run
, &x
, &y
);
244 picmemset(s
, frame
, val
, run
/ (8 / bits_per_plane
), &x
, &y
, &plane
, bits_per_plane
);
247 while (y
>= 0 && bytestream2_get_bytes_left(&s
->g
) > 0) {
248 memcpy(frame
->data
[0] + y
* frame
->linesize
[0], s
->g
.buffer
, FFMIN(avctx
->width
, bytestream2_get_bytes_left(&s
->g
)));
249 bytestream2_skip(&s
->g
, avctx
->width
);
259 AVCodec ff_pictor_decoder
= {
261 .long_name
= NULL_IF_CONFIG_SMALL("Pictor/PC Paint"),
262 .type
= AVMEDIA_TYPE_VIDEO
,
263 .id
= AV_CODEC_ID_PICTOR
,
264 .priv_data_size
= sizeof(PicContext
),
265 .decode
= decode_frame
,
266 .capabilities
= CODEC_CAP_DR1
,