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1 | /* |
2 | * Psygnosis YOP decoder | |
3 | * | |
4 | * Copyright (C) 2010 Mohamed Naufal Basheer <naufal11@gmail.com> | |
5 | * derived from the code by | |
6 | * Copyright (C) 2009 Thomas P. Higdon <thomas.p.higdon@gmail.com> | |
7 | * | |
8 | * This file is part of FFmpeg. | |
9 | * | |
10 | * FFmpeg is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU Lesser General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2.1 of the License, or (at your option) any later version. | |
14 | * | |
15 | * FFmpeg is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public | |
21 | * License along with FFmpeg; if not, write to the Free Software | |
22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
23 | */ | |
24 | ||
25 | #include "libavutil/intreadwrite.h" | |
26 | #include "libavutil/imgutils.h" | |
27 | ||
28 | #include "avcodec.h" | |
29 | #include "get_bits.h" | |
30 | #include "internal.h" | |
31 | ||
32 | typedef struct YopDecContext { | |
33 | AVCodecContext *avctx; | |
34 | AVFrame *frame; | |
35 | ||
36 | int num_pal_colors; | |
37 | int first_color[2]; | |
38 | int frame_data_length; | |
39 | ||
40 | uint8_t *low_nibble; | |
41 | uint8_t *srcptr; | |
42 | uint8_t *src_end; | |
43 | uint8_t *dstptr; | |
44 | uint8_t *dstbuf; | |
45 | } YopDecContext; | |
46 | ||
47 | // These tables are taken directly from: | |
48 | // http://wiki.multimedia.cx/index.php?title=Psygnosis_YOP | |
49 | ||
50 | /** | |
51 | * Lookup table for painting macroblocks. Bytes 0-2 of each entry contain | |
52 | * the macroblock positions to be painted (taken as (0, B0, B1, B2)). | |
53 | * Byte 3 contains the number of bytes consumed on the input, | |
54 | * equal to max(bytes 0-2) + 1. | |
55 | */ | |
56 | static const uint8_t paint_lut[15][4] = | |
57 | {{1, 2, 3, 4}, {1, 2, 0, 3}, | |
58 | {1, 2, 1, 3}, {1, 2, 2, 3}, | |
59 | {1, 0, 2, 3}, {1, 0, 0, 2}, | |
60 | {1, 0, 1, 2}, {1, 1, 2, 3}, | |
61 | {0, 1, 2, 3}, {0, 1, 0, 2}, | |
62 | {1, 1, 0, 2}, {0, 1, 1, 2}, | |
63 | {0, 0, 1, 2}, {0, 0, 0, 1}, | |
64 | {1, 1, 1, 2}, | |
65 | }; | |
66 | ||
67 | /** | |
68 | * Lookup table for copying macroblocks. Each entry contains the respective | |
69 | * x and y pixel offset for the copy source. | |
70 | */ | |
71 | static const int8_t motion_vector[16][2] = | |
72 | {{-4, -4}, {-2, -4}, | |
73 | { 0, -4}, { 2, -4}, | |
74 | {-4, -2}, {-4, 0}, | |
75 | {-3, -3}, {-1, -3}, | |
76 | { 1, -3}, { 3, -3}, | |
77 | {-3, -1}, {-2, -2}, | |
78 | { 0, -2}, { 2, -2}, | |
79 | { 4, -2}, {-2, 0}, | |
80 | }; | |
81 | ||
82 | static av_cold int yop_decode_close(AVCodecContext *avctx) | |
83 | { | |
84 | YopDecContext *s = avctx->priv_data; | |
85 | ||
86 | av_frame_free(&s->frame); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static av_cold int yop_decode_init(AVCodecContext *avctx) | |
92 | { | |
93 | YopDecContext *s = avctx->priv_data; | |
94 | s->avctx = avctx; | |
95 | ||
96 | if (avctx->width & 1 || avctx->height & 1 || | |
97 | av_image_check_size(avctx->width, avctx->height, 0, avctx) < 0) { | |
98 | av_log(avctx, AV_LOG_ERROR, "YOP has invalid dimensions\n"); | |
99 | return AVERROR_INVALIDDATA; | |
100 | } | |
101 | ||
102 | if (avctx->extradata_size < 3) { | |
103 | av_log(avctx, AV_LOG_ERROR, "Missing or incomplete extradata.\n"); | |
104 | return AVERROR_INVALIDDATA; | |
105 | } | |
106 | ||
107 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
108 | ||
109 | s->num_pal_colors = avctx->extradata[0]; | |
110 | s->first_color[0] = avctx->extradata[1]; | |
111 | s->first_color[1] = avctx->extradata[2]; | |
112 | ||
113 | if (s->num_pal_colors + s->first_color[0] > 256 || | |
114 | s->num_pal_colors + s->first_color[1] > 256) { | |
115 | av_log(avctx, AV_LOG_ERROR, | |
116 | "Palette parameters invalid, header probably corrupt\n"); | |
117 | return AVERROR_INVALIDDATA; | |
118 | } | |
119 | ||
120 | s->frame = av_frame_alloc(); | |
121 | if (!s->frame) | |
122 | return AVERROR(ENOMEM); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | /** | |
128 | * Paint a macroblock using the pattern in paint_lut. | |
129 | * @param s codec context | |
130 | * @param tag the tag that was in the nibble | |
131 | */ | |
132 | static int yop_paint_block(YopDecContext *s, int linesize, int tag) | |
133 | { | |
134 | if (s->src_end - s->srcptr < paint_lut[tag][3]) { | |
135 | av_log(s->avctx, AV_LOG_ERROR, "Packet too small.\n"); | |
136 | return AVERROR_INVALIDDATA; | |
137 | } | |
138 | ||
139 | s->dstptr[0] = s->srcptr[0]; | |
140 | s->dstptr[1] = s->srcptr[paint_lut[tag][0]]; | |
141 | s->dstptr[linesize] = s->srcptr[paint_lut[tag][1]]; | |
142 | s->dstptr[linesize + 1] = s->srcptr[paint_lut[tag][2]]; | |
143 | ||
144 | // The number of src bytes consumed is in the last part of the lut entry. | |
145 | s->srcptr += paint_lut[tag][3]; | |
146 | return 0; | |
147 | } | |
148 | ||
149 | /** | |
150 | * Copy a previously painted macroblock to the current_block. | |
151 | * @param copy_tag the tag that was in the nibble | |
152 | */ | |
153 | static int yop_copy_previous_block(YopDecContext *s, int linesize, int copy_tag) | |
154 | { | |
155 | uint8_t *bufptr; | |
156 | ||
157 | // Calculate position for the copy source | |
158 | bufptr = s->dstptr + motion_vector[copy_tag][0] + | |
159 | linesize * motion_vector[copy_tag][1]; | |
160 | if (bufptr < s->dstbuf) { | |
161 | av_log(s->avctx, AV_LOG_ERROR, "File probably corrupt\n"); | |
162 | return AVERROR_INVALIDDATA; | |
163 | } | |
164 | ||
165 | s->dstptr[0] = bufptr[0]; | |
166 | s->dstptr[1] = bufptr[1]; | |
167 | s->dstptr[linesize] = bufptr[linesize]; | |
168 | s->dstptr[linesize + 1] = bufptr[linesize + 1]; | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | /** | |
174 | * Return the next nibble in sequence, consuming a new byte on the input | |
175 | * only if necessary. | |
176 | */ | |
177 | static uint8_t yop_get_next_nibble(YopDecContext *s) | |
178 | { | |
179 | int ret; | |
180 | ||
181 | if (s->low_nibble) { | |
182 | ret = *s->low_nibble & 0xf; | |
183 | s->low_nibble = NULL; | |
184 | }else { | |
185 | s->low_nibble = s->srcptr++; | |
186 | ret = *s->low_nibble >> 4; | |
187 | } | |
188 | return ret; | |
189 | } | |
190 | ||
191 | static int yop_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, | |
192 | AVPacket *avpkt) | |
193 | { | |
194 | YopDecContext *s = avctx->priv_data; | |
195 | AVFrame *frame = s->frame; | |
196 | int tag, firstcolor, is_odd_frame; | |
197 | int ret, i, x, y; | |
198 | uint32_t *palette; | |
199 | ||
200 | if (avpkt->size < 4 + 3 * s->num_pal_colors) { | |
201 | av_log(avctx, AV_LOG_ERROR, "Packet too small.\n"); | |
202 | return AVERROR_INVALIDDATA; | |
203 | } | |
204 | ||
205 | if ((ret = ff_reget_buffer(avctx, frame)) < 0) | |
206 | return ret; | |
207 | ||
208 | if (!avctx->frame_number) | |
209 | memset(frame->data[1], 0, AVPALETTE_SIZE); | |
210 | ||
211 | s->dstbuf = frame->data[0]; | |
212 | s->dstptr = frame->data[0]; | |
213 | s->srcptr = avpkt->data + 4; | |
214 | s->src_end = avpkt->data + avpkt->size; | |
215 | s->low_nibble = NULL; | |
216 | ||
217 | is_odd_frame = avpkt->data[0]; | |
218 | if(is_odd_frame>1){ | |
219 | av_log(avctx, AV_LOG_ERROR, "frame is too odd %d\n", is_odd_frame); | |
220 | return AVERROR_INVALIDDATA; | |
221 | } | |
222 | firstcolor = s->first_color[is_odd_frame]; | |
223 | palette = (uint32_t *)frame->data[1]; | |
224 | ||
225 | for (i = 0; i < s->num_pal_colors; i++, s->srcptr += 3) { | |
226 | palette[i + firstcolor] = (s->srcptr[0] << 18) | | |
227 | (s->srcptr[1] << 10) | | |
228 | (s->srcptr[2] << 2); | |
229 | palette[i + firstcolor] |= 0xFFU << 24 | | |
230 | (palette[i + firstcolor] >> 6) & 0x30303; | |
231 | } | |
232 | ||
233 | frame->palette_has_changed = 1; | |
234 | ||
235 | for (y = 0; y < avctx->height; y += 2) { | |
236 | for (x = 0; x < avctx->width; x += 2) { | |
237 | if (s->srcptr - avpkt->data >= avpkt->size) { | |
238 | av_log(avctx, AV_LOG_ERROR, "Packet too small.\n"); | |
239 | return AVERROR_INVALIDDATA; | |
240 | } | |
241 | ||
242 | tag = yop_get_next_nibble(s); | |
243 | ||
244 | if (tag != 0xf) { | |
245 | ret = yop_paint_block(s, frame->linesize[0], tag); | |
246 | if (ret < 0) | |
247 | return ret; | |
248 | } else { | |
249 | tag = yop_get_next_nibble(s); | |
250 | ret = yop_copy_previous_block(s, frame->linesize[0], tag); | |
251 | if (ret < 0) | |
252 | return ret; | |
253 | } | |
254 | s->dstptr += 2; | |
255 | } | |
256 | s->dstptr += 2*frame->linesize[0] - x; | |
257 | } | |
258 | ||
259 | if ((ret = av_frame_ref(data, s->frame)) < 0) | |
260 | return ret; | |
261 | ||
262 | *got_frame = 1; | |
263 | return avpkt->size; | |
264 | } | |
265 | ||
266 | AVCodec ff_yop_decoder = { | |
267 | .name = "yop", | |
268 | .long_name = NULL_IF_CONFIG_SMALL("Psygnosis YOP Video"), | |
269 | .type = AVMEDIA_TYPE_VIDEO, | |
270 | .id = AV_CODEC_ID_YOP, | |
271 | .priv_data_size = sizeof(YopDecContext), | |
272 | .init = yop_decode_init, | |
273 | .close = yop_decode_close, | |
274 | .decode = yop_decode_frame, | |
275 | }; |