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1 | /* |
2 | * CDXL video decoder | |
3 | * Copyright (c) 2011-2012 Paul B Mahol | |
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 | * Commodore CDXL video decoder | |
25 | * @author Paul B Mahol | |
26 | */ | |
27 | ||
28 | #define UNCHECKED_BITSTREAM_READER 1 | |
29 | ||
30 | #include "libavutil/intreadwrite.h" | |
31 | #include "libavutil/imgutils.h" | |
32 | #include "avcodec.h" | |
33 | #include "get_bits.h" | |
34 | #include "internal.h" | |
35 | ||
36 | #define BIT_PLANAR 0x00 | |
37 | #define CHUNKY 0x20 | |
38 | #define BYTE_PLANAR 0x40 | |
39 | #define BIT_LINE 0x80 | |
40 | #define BYTE_LINE 0xC0 | |
41 | ||
42 | typedef struct { | |
43 | AVCodecContext *avctx; | |
44 | int bpp; | |
45 | int format; | |
46 | int padded_bits; | |
47 | const uint8_t *palette; | |
48 | int palette_size; | |
49 | const uint8_t *video; | |
50 | int video_size; | |
51 | uint8_t *new_video; | |
52 | int new_video_size; | |
53 | } CDXLVideoContext; | |
54 | ||
55 | static av_cold int cdxl_decode_init(AVCodecContext *avctx) | |
56 | { | |
57 | CDXLVideoContext *c = avctx->priv_data; | |
58 | ||
59 | c->new_video_size = 0; | |
60 | c->avctx = avctx; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | static void import_palette(CDXLVideoContext *c, uint32_t *new_palette) | |
66 | { | |
67 | int i; | |
68 | ||
69 | for (i = 0; i < c->palette_size / 2; i++) { | |
70 | unsigned rgb = AV_RB16(&c->palette[i * 2]); | |
71 | unsigned r = ((rgb >> 8) & 0xF) * 0x11; | |
72 | unsigned g = ((rgb >> 4) & 0xF) * 0x11; | |
73 | unsigned b = (rgb & 0xF) * 0x11; | |
74 | AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b); | |
75 | } | |
76 | } | |
77 | ||
78 | static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out) | |
79 | { | |
80 | GetBitContext gb; | |
81 | int x, y, plane; | |
82 | ||
83 | init_get_bits(&gb, c->video, c->video_size * 8); | |
84 | for (plane = 0; plane < c->bpp; plane++) { | |
85 | for (y = 0; y < c->avctx->height; y++) { | |
86 | for (x = 0; x < c->avctx->width; x++) | |
87 | out[linesize * y + x] |= get_bits1(&gb) << plane; | |
88 | skip_bits(&gb, c->padded_bits); | |
89 | } | |
90 | } | |
91 | } | |
92 | ||
93 | static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out) | |
94 | { | |
95 | GetBitContext gb; | |
96 | int x, y, plane; | |
97 | ||
98 | init_get_bits(&gb, c->video, c->video_size * 8); | |
99 | for (y = 0; y < c->avctx->height; y++) { | |
100 | for (plane = 0; plane < c->bpp; plane++) { | |
101 | for (x = 0; x < c->avctx->width; x++) | |
102 | out[linesize * y + x] |= get_bits1(&gb) << plane; | |
103 | skip_bits(&gb, c->padded_bits); | |
104 | } | |
105 | } | |
106 | } | |
107 | ||
108 | static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out) | |
109 | { | |
110 | memset(out, 0, linesize * c->avctx->height); | |
111 | ||
112 | switch (c->format) { | |
113 | case BIT_PLANAR: | |
114 | bitplanar2chunky(c, linesize, out); | |
115 | break; | |
116 | case BIT_LINE: | |
117 | bitline2chunky(c, linesize, out); | |
118 | break; | |
119 | } | |
120 | } | |
121 | ||
122 | static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame) | |
123 | { | |
124 | uint32_t *new_palette = (uint32_t *)frame->data[1]; | |
125 | ||
126 | memset(frame->data[1], 0, AVPALETTE_SIZE); | |
127 | import_palette(c, new_palette); | |
128 | import_format(c, frame->linesize[0], frame->data[0]); | |
129 | } | |
130 | ||
131 | static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame) | |
132 | { | |
133 | AVCodecContext *avctx = c->avctx; | |
134 | uint32_t new_palette[16], r, g, b; | |
135 | uint8_t *ptr, *out, index, op; | |
136 | int x, y; | |
137 | ||
138 | ptr = c->new_video; | |
139 | out = frame->data[0]; | |
140 | ||
141 | import_palette(c, new_palette); | |
142 | import_format(c, avctx->width, c->new_video); | |
143 | ||
144 | for (y = 0; y < avctx->height; y++) { | |
145 | r = new_palette[0] & 0xFF0000; | |
146 | g = new_palette[0] & 0xFF00; | |
147 | b = new_palette[0] & 0xFF; | |
148 | for (x = 0; x < avctx->width; x++) { | |
149 | index = *ptr++; | |
150 | op = index >> 4; | |
151 | index &= 15; | |
152 | switch (op) { | |
153 | case 0: | |
154 | r = new_palette[index] & 0xFF0000; | |
155 | g = new_palette[index] & 0xFF00; | |
156 | b = new_palette[index] & 0xFF; | |
157 | break; | |
158 | case 1: | |
159 | b = index * 0x11; | |
160 | break; | |
161 | case 2: | |
162 | r = index * 0x11 << 16; | |
163 | break; | |
164 | case 3: | |
165 | g = index * 0x11 << 8; | |
166 | break; | |
167 | } | |
168 | AV_WL24(out + x * 3, r | g | b); | |
169 | } | |
170 | out += frame->linesize[0]; | |
171 | } | |
172 | } | |
173 | ||
174 | static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame) | |
175 | { | |
176 | AVCodecContext *avctx = c->avctx; | |
177 | uint32_t new_palette[64], r, g, b; | |
178 | uint8_t *ptr, *out, index, op; | |
179 | int x, y; | |
180 | ||
181 | ptr = c->new_video; | |
182 | out = frame->data[0]; | |
183 | ||
184 | import_palette(c, new_palette); | |
185 | import_format(c, avctx->width, c->new_video); | |
186 | ||
187 | for (y = 0; y < avctx->height; y++) { | |
188 | r = new_palette[0] & 0xFF0000; | |
189 | g = new_palette[0] & 0xFF00; | |
190 | b = new_palette[0] & 0xFF; | |
191 | for (x = 0; x < avctx->width; x++) { | |
192 | index = *ptr++; | |
193 | op = index >> 6; | |
194 | index &= 63; | |
195 | switch (op) { | |
196 | case 0: | |
197 | r = new_palette[index] & 0xFF0000; | |
198 | g = new_palette[index] & 0xFF00; | |
199 | b = new_palette[index] & 0xFF; | |
200 | break; | |
201 | case 1: | |
202 | b = (index << 2) | (b & 3); | |
203 | break; | |
204 | case 2: | |
205 | r = (index << 18) | (r & (3 << 16)); | |
206 | break; | |
207 | case 3: | |
208 | g = (index << 10) | (g & (3 << 8)); | |
209 | break; | |
210 | } | |
211 | AV_WL24(out + x * 3, r | g | b); | |
212 | } | |
213 | out += frame->linesize[0]; | |
214 | } | |
215 | } | |
216 | ||
217 | static int cdxl_decode_frame(AVCodecContext *avctx, void *data, | |
218 | int *got_frame, AVPacket *pkt) | |
219 | { | |
220 | CDXLVideoContext *c = avctx->priv_data; | |
221 | AVFrame * const p = data; | |
222 | int ret, w, h, encoding, aligned_width, buf_size = pkt->size; | |
223 | const uint8_t *buf = pkt->data; | |
224 | ||
225 | if (buf_size < 32) | |
226 | return AVERROR_INVALIDDATA; | |
227 | encoding = buf[1] & 7; | |
228 | c->format = buf[1] & 0xE0; | |
229 | w = AV_RB16(&buf[14]); | |
230 | h = AV_RB16(&buf[16]); | |
231 | c->bpp = buf[19]; | |
232 | c->palette_size = AV_RB16(&buf[20]); | |
233 | c->palette = buf + 32; | |
234 | c->video = c->palette + c->palette_size; | |
235 | c->video_size = buf_size - c->palette_size - 32; | |
236 | ||
237 | if (c->palette_size > 512) | |
238 | return AVERROR_INVALIDDATA; | |
239 | if (buf_size < c->palette_size + 32) | |
240 | return AVERROR_INVALIDDATA; | |
241 | if (c->bpp < 1) | |
242 | return AVERROR_INVALIDDATA; | |
243 | if (c->format != BIT_PLANAR && c->format != BIT_LINE) { | |
244 | avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format); | |
245 | return AVERROR_PATCHWELCOME; | |
246 | } | |
247 | ||
248 | if ((ret = ff_set_dimensions(avctx, w, h)) < 0) | |
249 | return ret; | |
250 | ||
251 | aligned_width = FFALIGN(c->avctx->width, 16); | |
252 | c->padded_bits = aligned_width - c->avctx->width; | |
253 | if (c->video_size < aligned_width * avctx->height * c->bpp / 8) | |
254 | return AVERROR_INVALIDDATA; | |
255 | if (!encoding && c->palette_size && c->bpp <= 8) { | |
256 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
257 | } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) { | |
258 | if (c->palette_size != (1 << (c->bpp - 1))) | |
259 | return AVERROR_INVALIDDATA; | |
260 | avctx->pix_fmt = AV_PIX_FMT_BGR24; | |
261 | } else { | |
262 | avpriv_request_sample(avctx, "Encoding %d and bpp %d", | |
263 | encoding, c->bpp); | |
264 | return AVERROR_PATCHWELCOME; | |
265 | } | |
266 | ||
267 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) | |
268 | return ret; | |
269 | p->pict_type = AV_PICTURE_TYPE_I; | |
270 | ||
271 | if (encoding) { | |
272 | av_fast_padded_malloc(&c->new_video, &c->new_video_size, | |
273 | h * w + FF_INPUT_BUFFER_PADDING_SIZE); | |
274 | if (!c->new_video) | |
275 | return AVERROR(ENOMEM); | |
276 | if (c->bpp == 8) | |
277 | cdxl_decode_ham8(c, p); | |
278 | else | |
279 | cdxl_decode_ham6(c, p); | |
280 | } else { | |
281 | cdxl_decode_rgb(c, p); | |
282 | } | |
283 | *got_frame = 1; | |
284 | ||
285 | return buf_size; | |
286 | } | |
287 | ||
288 | static av_cold int cdxl_decode_end(AVCodecContext *avctx) | |
289 | { | |
290 | CDXLVideoContext *c = avctx->priv_data; | |
291 | ||
292 | av_freep(&c->new_video); | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | AVCodec ff_cdxl_decoder = { | |
298 | .name = "cdxl", | |
299 | .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"), | |
300 | .type = AVMEDIA_TYPE_VIDEO, | |
301 | .id = AV_CODEC_ID_CDXL, | |
302 | .priv_data_size = sizeof(CDXLVideoContext), | |
303 | .init = cdxl_decode_init, | |
304 | .close = cdxl_decode_end, | |
305 | .decode = cdxl_decode_frame, | |
306 | .capabilities = CODEC_CAP_DR1, | |
307 | }; |