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9a0ddd09 AH |
1 | /* |
2 | * Interplay C93 video decoder | |
3 | * Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com> | |
4 | * | |
2912e87a | 5 | * This file is part of Libav. |
9a0ddd09 | 6 | * |
2912e87a | 7 | * Libav is free software; you can redistribute it and/or |
9a0ddd09 AH |
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 | * | |
2912e87a | 12 | * Libav is distributed in the hope that it will be useful, |
9a0ddd09 AH |
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 | |
2912e87a | 18 | * License along with Libav; if not, write to the Free Software |
e5a389a1 | 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
9a0ddd09 AH |
20 | */ |
21 | ||
22 | #include "avcodec.h" | |
23 | #include "bytestream.h" | |
24 | ||
25 | typedef struct { | |
26 | AVFrame pictures[2]; | |
27 | int currentpic; | |
28 | } C93DecoderContext; | |
29 | ||
30 | typedef enum { | |
31 | C93_8X8_FROM_PREV = 0x02, | |
32 | C93_4X4_FROM_PREV = 0x06, | |
33 | C93_4X4_FROM_CURR = 0x07, | |
34 | C93_8X8_2COLOR = 0x08, | |
35 | C93_4X4_2COLOR = 0x0A, | |
36 | C93_4X4_4COLOR_GRP = 0x0B, | |
37 | C93_4X4_4COLOR = 0x0D, | |
38 | C93_NOOP = 0x0E, | |
39 | C93_8X8_INTRA = 0x0F, | |
40 | } C93BlockType; | |
41 | ||
42 | #define WIDTH 320 | |
43 | #define HEIGHT 192 | |
44 | ||
45 | #define C93_HAS_PALETTE 0x01 | |
46 | #define C93_FIRST_FRAME 0x02 | |
47 | ||
98a6fff9 | 48 | static av_cold int decode_init(AVCodecContext *avctx) |
9a0ddd09 AH |
49 | { |
50 | avctx->pix_fmt = PIX_FMT_PAL8; | |
51 | return 0; | |
52 | } | |
53 | ||
98a6fff9 | 54 | static av_cold int decode_end(AVCodecContext *avctx) |
9a0ddd09 AH |
55 | { |
56 | C93DecoderContext * const c93 = avctx->priv_data; | |
57 | ||
58 | if (c93->pictures[0].data[0]) | |
59 | avctx->release_buffer(avctx, &c93->pictures[0]); | |
60 | if (c93->pictures[1].data[0]) | |
61 | avctx->release_buffer(avctx, &c93->pictures[1]); | |
62 | return 0; | |
63 | } | |
64 | ||
bee4f778 | 65 | static inline int copy_block(AVCodecContext *avctx, uint8_t *to, |
9a0ddd09 AH |
66 | uint8_t *from, int offset, int height, int stride) |
67 | { | |
68 | int i; | |
69 | int width = height; | |
70 | int from_x = offset % WIDTH; | |
71 | int from_y = offset / WIDTH; | |
72 | int overflow = from_x + width - WIDTH; | |
73 | ||
74 | if (!from) { | |
75 | /* silently ignoring predictive blocks in first frame */ | |
76 | return 0; | |
77 | } | |
78 | ||
79 | if (from_y + height > HEIGHT) { | |
80 | av_log(avctx, AV_LOG_ERROR, "invalid offset %d during C93 decoding\n", | |
81 | offset); | |
82 | return -1; | |
83 | } | |
84 | ||
85 | if (overflow > 0) { | |
86 | width -= overflow; | |
87 | for (i = 0; i < height; i++) { | |
88 | memcpy(&to[i*stride+width], &from[(from_y+i)*stride], overflow); | |
89 | } | |
90 | } | |
91 | ||
92 | for (i = 0; i < height; i++) { | |
93 | memcpy(&to[i*stride], &from[(from_y+i)*stride+from_x], width); | |
94 | } | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
bee4f778 | 99 | static inline void draw_n_color(uint8_t *out, int stride, int width, |
9a0ddd09 AH |
100 | int height, int bpp, uint8_t cols[4], uint8_t grps[4], uint32_t col) |
101 | { | |
102 | int x, y; | |
103 | for (y = 0; y < height; y++) { | |
104 | if (grps) | |
105 | cols[0] = grps[3 * (y >> 1)]; | |
106 | for (x = 0; x < width; x++) { | |
107 | if (grps) | |
108 | cols[1]= grps[(x >> 1) + 1]; | |
109 | out[x + y*stride] = cols[col & ((1 << bpp) - 1)]; | |
110 | col >>= bpp; | |
111 | } | |
112 | } | |
113 | } | |
114 | ||
bee4f778 | 115 | static int decode_frame(AVCodecContext *avctx, void *data, |
7a00bbad | 116 | int *data_size, AVPacket *avpkt) |
9a0ddd09 | 117 | { |
7a00bbad TB |
118 | const uint8_t *buf = avpkt->data; |
119 | int buf_size = avpkt->size; | |
9a0ddd09 AH |
120 | C93DecoderContext * const c93 = avctx->priv_data; |
121 | AVFrame * const newpic = &c93->pictures[c93->currentpic]; | |
122 | AVFrame * const oldpic = &c93->pictures[c93->currentpic^1]; | |
123 | AVFrame *picture = data; | |
85aded74 | 124 | GetByteContext gb; |
9a0ddd09 | 125 | uint8_t *out; |
85aded74 | 126 | int stride, i, x, y, b, bt = 0; |
9a0ddd09 AH |
127 | |
128 | c93->currentpic ^= 1; | |
129 | ||
130 | newpic->reference = 1; | |
131 | newpic->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | | |
132 | FF_BUFFER_HINTS_REUSABLE | FF_BUFFER_HINTS_READABLE; | |
133 | if (avctx->reget_buffer(avctx, newpic)) { | |
134 | av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); | |
135 | return -1; | |
136 | } | |
137 | ||
138 | stride = newpic->linesize[0]; | |
139 | ||
85aded74 PM |
140 | bytestream2_init(&gb, buf, buf_size); |
141 | b = bytestream2_get_byte(&gb); | |
142 | if (b & C93_FIRST_FRAME) { | |
975a1447 | 143 | newpic->pict_type = AV_PICTURE_TYPE_I; |
9a0ddd09 AH |
144 | newpic->key_frame = 1; |
145 | } else { | |
975a1447 | 146 | newpic->pict_type = AV_PICTURE_TYPE_P; |
9a0ddd09 AH |
147 | newpic->key_frame = 0; |
148 | } | |
149 | ||
9a0ddd09 AH |
150 | for (y = 0; y < HEIGHT; y += 8) { |
151 | out = newpic->data[0] + y * stride; | |
152 | for (x = 0; x < WIDTH; x += 8) { | |
153 | uint8_t *copy_from = oldpic->data[0]; | |
154 | unsigned int offset, j; | |
155 | uint8_t cols[4], grps[4]; | |
fb12fca3 | 156 | C93BlockType block_type; |
9a0ddd09 AH |
157 | |
158 | if (!bt) | |
85aded74 | 159 | bt = bytestream2_get_byte(&gb); |
9a0ddd09 | 160 | |
fb12fca3 MN |
161 | block_type= bt & 0x0F; |
162 | switch (block_type) { | |
9a0ddd09 | 163 | case C93_8X8_FROM_PREV: |
85aded74 | 164 | offset = bytestream2_get_le16(&gb); |
bee4f778 | 165 | if (copy_block(avctx, out, copy_from, offset, 8, stride)) |
9a0ddd09 AH |
166 | return -1; |
167 | break; | |
168 | ||
169 | case C93_4X4_FROM_CURR: | |
170 | copy_from = newpic->data[0]; | |
171 | case C93_4X4_FROM_PREV: | |
172 | for (j = 0; j < 8; j += 4) { | |
173 | for (i = 0; i < 8; i += 4) { | |
85aded74 | 174 | offset = bytestream2_get_le16(&gb); |
bee4f778 | 175 | if (copy_block(avctx, &out[j*stride+i], |
9a0ddd09 AH |
176 | copy_from, offset, 4, stride)) |
177 | return -1; | |
178 | } | |
179 | } | |
180 | break; | |
181 | ||
182 | case C93_8X8_2COLOR: | |
85aded74 | 183 | bytestream2_get_buffer(&gb, cols, 2); |
9a0ddd09 | 184 | for (i = 0; i < 8; i++) { |
bee4f778 | 185 | draw_n_color(out + i*stride, stride, 8, 1, 1, cols, |
85aded74 | 186 | NULL, bytestream2_get_byte(&gb)); |
9a0ddd09 AH |
187 | } |
188 | ||
189 | break; | |
190 | ||
191 | case C93_4X4_2COLOR: | |
192 | case C93_4X4_4COLOR: | |
193 | case C93_4X4_4COLOR_GRP: | |
194 | for (j = 0; j < 8; j += 4) { | |
195 | for (i = 0; i < 8; i += 4) { | |
fb12fca3 | 196 | if (block_type == C93_4X4_2COLOR) { |
85aded74 | 197 | bytestream2_get_buffer(&gb, cols, 2); |
bee4f778 | 198 | draw_n_color(out + i + j*stride, stride, 4, 4, |
85aded74 | 199 | 1, cols, NULL, bytestream2_get_le16(&gb)); |
fb12fca3 | 200 | } else if (block_type == C93_4X4_4COLOR) { |
85aded74 | 201 | bytestream2_get_buffer(&gb, cols, 4); |
bee4f778 | 202 | draw_n_color(out + i + j*stride, stride, 4, 4, |
85aded74 | 203 | 2, cols, NULL, bytestream2_get_le32(&gb)); |
9a0ddd09 | 204 | } else { |
85aded74 | 205 | bytestream2_get_buffer(&gb, grps, 4); |
bee4f778 | 206 | draw_n_color(out + i + j*stride, stride, 4, 4, |
85aded74 | 207 | 1, cols, grps, bytestream2_get_le16(&gb)); |
9a0ddd09 AH |
208 | } |
209 | } | |
210 | } | |
211 | break; | |
212 | ||
213 | case C93_NOOP: | |
214 | break; | |
215 | ||
216 | case C93_8X8_INTRA: | |
217 | for (j = 0; j < 8; j++) | |
85aded74 | 218 | bytestream2_get_buffer(&gb, out + j*stride, 8); |
9a0ddd09 AH |
219 | break; |
220 | ||
221 | default: | |
222 | av_log(avctx, AV_LOG_ERROR, "unexpected type %x at %dx%d\n", | |
fb12fca3 | 223 | block_type, x, y); |
9a0ddd09 AH |
224 | return -1; |
225 | } | |
226 | bt >>= 4; | |
227 | out += 8; | |
228 | } | |
229 | } | |
230 | ||
85aded74 PM |
231 | if (b & C93_HAS_PALETTE) { |
232 | uint32_t *palette = (uint32_t *) newpic->data[1]; | |
233 | for (i = 0; i < 256; i++) { | |
234 | palette[i] = bytestream2_get_be24(&gb); | |
235 | } | |
236 | } else { | |
237 | if (oldpic->data[1]) | |
238 | memcpy(newpic->data[1], oldpic->data[1], 256 * 4); | |
239 | } | |
240 | ||
9a0ddd09 AH |
241 | *picture = *newpic; |
242 | *data_size = sizeof(AVFrame); | |
243 | ||
244 | return buf_size; | |
245 | } | |
246 | ||
d36beb3f | 247 | AVCodec ff_c93_decoder = { |
ec6402b7 AK |
248 | .name = "c93", |
249 | .type = AVMEDIA_TYPE_VIDEO, | |
250 | .id = CODEC_ID_C93, | |
251 | .priv_data_size = sizeof(C93DecoderContext), | |
252 | .init = decode_init, | |
253 | .close = decode_end, | |
254 | .decode = decode_frame, | |
255 | .capabilities = CODEC_CAP_DR1, | |
fe4bf374 | 256 | .long_name = NULL_IF_CONFIG_SMALL("Interplay C93"), |
9a0ddd09 | 257 | }; |