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1 | /* |
2 | * Tiertex Limited SEQ Video Decoder | |
3 | * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net) | |
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 | /** | |
23 | * @file | |
24 | * Tiertex Limited SEQ video decoder | |
25 | */ | |
26 | ||
27 | #include "avcodec.h" | |
28 | #define BITSTREAM_READER_LE | |
29 | #include "get_bits.h" | |
30 | #include "internal.h" | |
31 | ||
32 | ||
33 | typedef struct SeqVideoContext { | |
34 | AVCodecContext *avctx; | |
35 | AVFrame *frame; | |
36 | } SeqVideoContext; | |
37 | ||
38 | ||
39 | static const unsigned char *seq_unpack_rle_block(const unsigned char *src, | |
40 | const unsigned char *src_end, | |
41 | unsigned char *dst, int dst_size) | |
42 | { | |
43 | int i, len, sz; | |
44 | GetBitContext gb; | |
45 | int code_table[64]; | |
46 | ||
47 | /* get the rle codes */ | |
48 | init_get_bits(&gb, src, (src_end - src) * 8); | |
49 | for (i = 0, sz = 0; i < 64 && sz < dst_size; i++) { | |
50 | if (get_bits_left(&gb) < 4) | |
51 | return NULL; | |
52 | code_table[i] = get_sbits(&gb, 4); | |
53 | sz += FFABS(code_table[i]); | |
54 | } | |
55 | src += (get_bits_count(&gb) + 7) / 8; | |
56 | ||
57 | /* do the rle unpacking */ | |
58 | for (i = 0; i < 64 && dst_size > 0; i++) { | |
59 | len = code_table[i]; | |
60 | if (len < 0) { | |
61 | len = -len; | |
62 | if (src_end - src < 1) | |
63 | return NULL; | |
64 | memset(dst, *src++, FFMIN(len, dst_size)); | |
65 | } else { | |
66 | if (src_end - src < len) | |
67 | return NULL; | |
68 | memcpy(dst, src, FFMIN(len, dst_size)); | |
69 | src += len; | |
70 | } | |
71 | dst += len; | |
72 | dst_size -= len; | |
73 | } | |
74 | return src; | |
75 | } | |
76 | ||
77 | static const unsigned char *seq_decode_op1(SeqVideoContext *seq, | |
78 | const unsigned char *src, | |
79 | const unsigned char *src_end, | |
80 | unsigned char *dst) | |
81 | { | |
82 | const unsigned char *color_table; | |
83 | int b, i, len, bits; | |
84 | GetBitContext gb; | |
85 | unsigned char block[8 * 8]; | |
86 | ||
87 | if (src_end - src < 1) | |
88 | return NULL; | |
89 | len = *src++; | |
90 | if (len & 0x80) { | |
91 | switch (len & 3) { | |
92 | case 1: | |
93 | src = seq_unpack_rle_block(src, src_end, block, sizeof(block)); | |
94 | for (b = 0; b < 8; b++) { | |
95 | memcpy(dst, &block[b * 8], 8); | |
96 | dst += seq->frame->linesize[0]; | |
97 | } | |
98 | break; | |
99 | case 2: | |
100 | src = seq_unpack_rle_block(src, src_end, block, sizeof(block)); | |
101 | for (i = 0; i < 8; i++) { | |
102 | for (b = 0; b < 8; b++) | |
103 | dst[b * seq->frame->linesize[0]] = block[i * 8 + b]; | |
104 | ++dst; | |
105 | } | |
106 | break; | |
107 | } | |
108 | } else { | |
109 | if (len <= 0) | |
110 | return NULL; | |
111 | bits = ff_log2_tab[len - 1] + 1; | |
112 | if (src_end - src < len + 8 * bits) | |
113 | return NULL; | |
114 | color_table = src; | |
115 | src += len; | |
116 | init_get_bits(&gb, src, bits * 8 * 8); src += bits * 8; | |
117 | for (b = 0; b < 8; b++) { | |
118 | for (i = 0; i < 8; i++) | |
119 | dst[i] = color_table[get_bits(&gb, bits)]; | |
120 | dst += seq->frame->linesize[0]; | |
121 | } | |
122 | } | |
123 | ||
124 | return src; | |
125 | } | |
126 | ||
127 | static const unsigned char *seq_decode_op2(SeqVideoContext *seq, | |
128 | const unsigned char *src, | |
129 | const unsigned char *src_end, | |
130 | unsigned char *dst) | |
131 | { | |
132 | int i; | |
133 | ||
134 | if (src_end - src < 8 * 8) | |
135 | return NULL; | |
136 | ||
137 | for (i = 0; i < 8; i++) { | |
138 | memcpy(dst, src, 8); | |
139 | src += 8; | |
140 | dst += seq->frame->linesize[0]; | |
141 | } | |
142 | ||
143 | return src; | |
144 | } | |
145 | ||
146 | static const unsigned char *seq_decode_op3(SeqVideoContext *seq, | |
147 | const unsigned char *src, | |
148 | const unsigned char *src_end, | |
149 | unsigned char *dst) | |
150 | { | |
151 | int pos, offset; | |
152 | ||
153 | do { | |
154 | if (src_end - src < 2) | |
155 | return NULL; | |
156 | pos = *src++; | |
157 | offset = ((pos >> 3) & 7) * seq->frame->linesize[0] + (pos & 7); | |
158 | dst[offset] = *src++; | |
159 | } while (!(pos & 0x80)); | |
160 | ||
161 | return src; | |
162 | } | |
163 | ||
164 | static int seqvideo_decode(SeqVideoContext *seq, const unsigned char *data, int data_size) | |
165 | { | |
166 | const unsigned char *data_end = data + data_size; | |
167 | GetBitContext gb; | |
168 | int flags, i, j, x, y, op; | |
169 | unsigned char c[3]; | |
170 | unsigned char *dst; | |
171 | uint32_t *palette; | |
172 | ||
173 | flags = *data++; | |
174 | ||
175 | if (flags & 1) { | |
176 | palette = (uint32_t *)seq->frame->data[1]; | |
177 | if (data_end - data < 256 * 3) | |
178 | return AVERROR_INVALIDDATA; | |
179 | for (i = 0; i < 256; i++) { | |
180 | for (j = 0; j < 3; j++, data++) | |
181 | c[j] = (*data << 2) | (*data >> 4); | |
182 | palette[i] = 0xFFU << 24 | AV_RB24(c); | |
183 | } | |
184 | seq->frame->palette_has_changed = 1; | |
185 | } | |
186 | ||
187 | if (flags & 2) { | |
188 | if (data_end - data < 128) | |
189 | return AVERROR_INVALIDDATA; | |
190 | init_get_bits(&gb, data, 128 * 8); data += 128; | |
191 | for (y = 0; y < 128; y += 8) | |
192 | for (x = 0; x < 256; x += 8) { | |
193 | dst = &seq->frame->data[0][y * seq->frame->linesize[0] + x]; | |
194 | op = get_bits(&gb, 2); | |
195 | switch (op) { | |
196 | case 1: | |
197 | data = seq_decode_op1(seq, data, data_end, dst); | |
198 | break; | |
199 | case 2: | |
200 | data = seq_decode_op2(seq, data, data_end, dst); | |
201 | break; | |
202 | case 3: | |
203 | data = seq_decode_op3(seq, data, data_end, dst); | |
204 | break; | |
205 | } | |
206 | if (!data) | |
207 | return AVERROR_INVALIDDATA; | |
208 | } | |
209 | } | |
210 | return 0; | |
211 | } | |
212 | ||
213 | static av_cold int seqvideo_decode_init(AVCodecContext *avctx) | |
214 | { | |
215 | SeqVideoContext *seq = avctx->priv_data; | |
216 | ||
217 | seq->avctx = avctx; | |
218 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
219 | ||
220 | seq->frame = av_frame_alloc(); | |
221 | if (!seq->frame) | |
222 | return AVERROR(ENOMEM); | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | static int seqvideo_decode_frame(AVCodecContext *avctx, | |
228 | void *data, int *got_frame, | |
229 | AVPacket *avpkt) | |
230 | { | |
231 | const uint8_t *buf = avpkt->data; | |
232 | int buf_size = avpkt->size; | |
233 | int ret; | |
234 | ||
235 | SeqVideoContext *seq = avctx->priv_data; | |
236 | ||
237 | if ((ret = ff_reget_buffer(avctx, seq->frame)) < 0) | |
238 | return ret; | |
239 | ||
240 | if (seqvideo_decode(seq, buf, buf_size)) | |
241 | return AVERROR_INVALIDDATA; | |
242 | ||
243 | if ((ret = av_frame_ref(data, seq->frame)) < 0) | |
244 | return ret; | |
245 | *got_frame = 1; | |
246 | ||
247 | return buf_size; | |
248 | } | |
249 | ||
250 | static av_cold int seqvideo_decode_end(AVCodecContext *avctx) | |
251 | { | |
252 | SeqVideoContext *seq = avctx->priv_data; | |
253 | ||
254 | av_frame_free(&seq->frame); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | AVCodec ff_tiertexseqvideo_decoder = { | |
260 | .name = "tiertexseqvideo", | |
261 | .long_name = NULL_IF_CONFIG_SMALL("Tiertex Limited SEQ video"), | |
262 | .type = AVMEDIA_TYPE_VIDEO, | |
263 | .id = AV_CODEC_ID_TIERTEXSEQVIDEO, | |
264 | .priv_data_size = sizeof(SeqVideoContext), | |
265 | .init = seqvideo_decode_init, | |
266 | .close = seqvideo_decode_end, | |
267 | .decode = seqvideo_decode_frame, | |
268 | .capabilities = CODEC_CAP_DR1, | |
269 | }; |