1/*
2 * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder
3 * Copyright (c) 2007, 2008 Ivo van Poorten
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22#include "libavutil/intreadwrite.h"
23#include "avcodec.h"
24
25#define RT_OLD          0
26#define RT_STANDARD     1
27#define RT_BYTE_ENCODED 2
28#define RT_FORMAT_RGB   3
29#define RT_FORMAT_TIFF  4
30#define RT_FORMAT_IFF   5
31
32typedef struct SUNRASTContext {
33    AVFrame picture;
34} SUNRASTContext;
35
36static av_cold int sunrast_init(AVCodecContext *avctx) {
37    SUNRASTContext *s = avctx->priv_data;
38
39    avcodec_get_frame_defaults(&s->picture);
40    avctx->coded_frame= &s->picture;
41
42    return 0;
43}
44
45static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
46                                int *data_size, const uint8_t *buf, int buf_size) {
47    SUNRASTContext * const s = avctx->priv_data;
48    AVFrame *picture = data;
49    AVFrame * const p = &s->picture;
50    unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
51    uint8_t *ptr;
52    const uint8_t *bufstart = buf;
53
54    if (AV_RB32(buf) != 0x59a66a95) {
55        av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
56        return -1;
57    }
58
59    w         = AV_RB32(buf+4);
60    h         = AV_RB32(buf+8);
61    depth     = AV_RB32(buf+12);
62    type      = AV_RB32(buf+20);
63    maptype   = AV_RB32(buf+24);
64    maplength = AV_RB32(buf+28);
65
66    if (type > RT_BYTE_ENCODED && type <= RT_FORMAT_IFF) {
67        av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
68        return -1;
69    }
70    if (type > RT_FORMAT_IFF) {
71        av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
72        return -1;
73    }
74    if (maptype & ~1) {
75        av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
76        return -1;
77    }
78
79    buf += 32;
80
81    switch (depth) {
82        case 1:
83            avctx->pix_fmt = PIX_FMT_MONOWHITE;
84            break;
85        case 8:
86            avctx->pix_fmt = PIX_FMT_PAL8;
87            break;
88        case 24:
89            avctx->pix_fmt = PIX_FMT_BGR24;
90            break;
91        default:
92            av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
93            return -1;
94    }
95
96    if (p->data[0])
97        avctx->release_buffer(avctx, p);
98
99    if (avcodec_check_dimensions(avctx, w, h))
100        return -1;
101    if (w != avctx->width || h != avctx->height)
102        avcodec_set_dimensions(avctx, w, h);
103    if (avctx->get_buffer(avctx, p) < 0) {
104        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
105        return -1;
106    }
107
108    p->pict_type = FF_I_TYPE;
109
110    if (depth != 8 && maplength) {
111        av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
112
113    } else if (depth == 8) {
114        unsigned int len = maplength / 3;
115
116        if (!maplength) {
117            av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
118            return -1;
119        }
120        if (maplength % 3 || maplength > 768) {
121            av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
122            return -1;
123        }
124
125        ptr = p->data[1];
126        for (x=0; x<len; x++, ptr+=4)
127            *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
128    }
129
130    buf += maplength;
131
132    ptr    = p->data[0];
133    stride = p->linesize[0];
134
135    /* scanlines are aligned on 16 bit boundaries */
136    len  = (depth * w + 7) >> 3;
137    alen = len + (len&1);
138
139    if (type == RT_BYTE_ENCODED) {
140        int value, run;
141        uint8_t *end = ptr + h*stride;
142
143        x = 0;
144        while (ptr != end) {
145            run = 1;
146            if ((value = *buf++) == 0x80) {
147                run = *buf++ + 1;
148                if (run != 1)
149                    value = *buf++;
150            }
151            while (run--) {
152                if (x < len)
153                    ptr[x] = value;
154                if (++x >= alen) {
155                    x = 0;
156                    ptr += stride;
157                    if (ptr == end)
158                        break;
159                }
160            }
161        }
162    } else {
163        for (y=0; y<h; y++) {
164            memcpy(ptr, buf, len);
165            ptr += stride;
166            buf += alen;
167        }
168    }
169
170    *picture = s->picture;
171    *data_size = sizeof(AVFrame);
172
173    return buf - bufstart;
174}
175
176static av_cold int sunrast_end(AVCodecContext *avctx) {
177    SUNRASTContext *s = avctx->priv_data;
178
179    if(s->picture.data[0])
180        avctx->release_buffer(avctx, &s->picture);
181
182    return 0;
183}
184
185AVCodec sunrast_decoder = {
186    "sunrast",
187    CODEC_TYPE_VIDEO,
188    CODEC_ID_SUNRAST,
189    sizeof(SUNRASTContext),
190    sunrast_init,
191    NULL,
192    sunrast_end,
193    sunrast_decode_frame,
194    0,
195    NULL,
196    .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
197};
198