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 "bytestream.h"
34 #include "get_bits.h"
35 #include "internal.h"
36
37 #define BIT_PLANAR 0x00
38 #define CHUNKY 0x20
39 #define BYTE_PLANAR 0x40
40 #define BIT_LINE 0x80
41 #define BYTE_LINE 0xC0
42
43 typedef struct CDXLVideoContext {
44 AVCodecContext *avctx;
45 int bpp;
46 int type;
47 int format;
48 int padded_bits;
49 const uint8_t *palette;
50 int palette_size;
51 const uint8_t *video;
52 int video_size;
53 uint8_t *new_video;
54 int new_video_size;
55 } CDXLVideoContext;
56
cdxl_decode_init(AVCodecContext * avctx)57 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
58 {
59 CDXLVideoContext *c = avctx->priv_data;
60
61 c->new_video_size = 0;
62 c->avctx = avctx;
63
64 return 0;
65 }
66
import_palette(CDXLVideoContext * c,uint32_t * new_palette)67 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
68 {
69 if (c->type == 1) {
70 for (int i = 0; i < c->palette_size / 2; i++) {
71 unsigned rgb = AV_RB16(&c->palette[i * 2]);
72 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
73 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
74 unsigned b = (rgb & 0xF) * 0x11;
75 AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);
76 }
77 } else {
78 for (int i = 0; i < c->palette_size / 3; i++) {
79 unsigned rgb = AV_RB24(&c->palette[i * 3]);
80 AV_WN32(&new_palette[i], (0xFFU << 24) | rgb);
81 }
82 }
83 }
84
bitplanar2chunky(CDXLVideoContext * c,int linesize,uint8_t * out)85 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
86 {
87 GetBitContext gb;
88 int x, y, plane;
89
90 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
91 return;
92 for (plane = 0; plane < c->bpp; plane++) {
93 for (y = 0; y < c->avctx->height; y++) {
94 for (x = 0; x < c->avctx->width; x++)
95 out[linesize * y + x] |= get_bits1(&gb) << plane;
96 skip_bits(&gb, c->padded_bits);
97 }
98 }
99 }
100
bitline2chunky(CDXLVideoContext * c,int linesize,uint8_t * out)101 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
102 {
103 GetBitContext gb;
104 int x, y, plane;
105
106 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
107 return;
108 for (y = 0; y < c->avctx->height; y++) {
109 for (plane = 0; plane < c->bpp; plane++) {
110 for (x = 0; x < c->avctx->width; x++)
111 out[linesize * y + x] |= get_bits1(&gb) << plane;
112 skip_bits(&gb, c->padded_bits);
113 }
114 }
115 }
116
chunky2chunky(CDXLVideoContext * c,int linesize,uint8_t * out)117 static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
118 {
119 GetByteContext gb;
120 int y;
121
122 bytestream2_init(&gb, c->video, c->video_size);
123 for (y = 0; y < c->avctx->height; y++) {
124 bytestream2_get_buffer(&gb, out + linesize * y, c->avctx->width * 3);
125 }
126 }
127
import_format(CDXLVideoContext * c,int linesize,uint8_t * out)128 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
129 {
130 memset(out, 0, linesize * c->avctx->height);
131
132 switch (c->format) {
133 case BIT_PLANAR:
134 bitplanar2chunky(c, linesize, out);
135 break;
136 case BIT_LINE:
137 bitline2chunky(c, linesize, out);
138 break;
139 case CHUNKY:
140 chunky2chunky(c, linesize, out);
141 break;
142 }
143 }
144
cdxl_decode_rgb(CDXLVideoContext * c,AVFrame * frame)145 static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
146 {
147 uint32_t *new_palette = (uint32_t *)frame->data[1];
148
149 memset(frame->data[1], 0, AVPALETTE_SIZE);
150 import_palette(c, new_palette);
151 import_format(c, frame->linesize[0], frame->data[0]);
152 }
153
cdxl_decode_raw(CDXLVideoContext * c,AVFrame * frame)154 static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
155 {
156 import_format(c, frame->linesize[0], frame->data[0]);
157 }
158
cdxl_decode_ham6(CDXLVideoContext * c,AVFrame * frame)159 static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
160 {
161 AVCodecContext *avctx = c->avctx;
162 uint32_t new_palette[16], r, g, b;
163 uint8_t *ptr, *out, index, op;
164 int x, y;
165
166 ptr = c->new_video;
167 out = frame->data[0];
168
169 import_palette(c, new_palette);
170 import_format(c, avctx->width, c->new_video);
171
172 for (y = 0; y < avctx->height; y++) {
173 r = new_palette[0] & 0xFF0000;
174 g = new_palette[0] & 0xFF00;
175 b = new_palette[0] & 0xFF;
176 for (x = 0; x < avctx->width; x++) {
177 index = *ptr++;
178 op = index >> 4;
179 index &= 15;
180 switch (op) {
181 case 0:
182 r = new_palette[index] & 0xFF0000;
183 g = new_palette[index] & 0xFF00;
184 b = new_palette[index] & 0xFF;
185 break;
186 case 1:
187 b = index * 0x11;
188 break;
189 case 2:
190 r = index * 0x11 << 16;
191 break;
192 case 3:
193 g = index * 0x11 << 8;
194 break;
195 }
196 AV_WL24(out + x * 3, r | g | b);
197 }
198 out += frame->linesize[0];
199 }
200 }
201
cdxl_decode_ham8(CDXLVideoContext * c,AVFrame * frame)202 static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
203 {
204 AVCodecContext *avctx = c->avctx;
205 uint32_t new_palette[64], r, g, b;
206 uint8_t *ptr, *out, index, op;
207 int x, y;
208
209 ptr = c->new_video;
210 out = frame->data[0];
211
212 import_palette(c, new_palette);
213 import_format(c, avctx->width, c->new_video);
214
215 for (y = 0; y < avctx->height; y++) {
216 r = new_palette[0] & 0xFF0000;
217 g = new_palette[0] & 0xFF00;
218 b = new_palette[0] & 0xFF;
219 for (x = 0; x < avctx->width; x++) {
220 index = *ptr++;
221 op = index >> 6;
222 index &= 63;
223 switch (op) {
224 case 0:
225 r = new_palette[index] & 0xFF0000;
226 g = new_palette[index] & 0xFF00;
227 b = new_palette[index] & 0xFF;
228 break;
229 case 1:
230 b = (index << 2) | (b & 3);
231 break;
232 case 2:
233 r = (index << 18) | (r & (3 << 16));
234 break;
235 case 3:
236 g = (index << 10) | (g & (3 << 8));
237 break;
238 }
239 AV_WL24(out + x * 3, r | g | b);
240 }
241 out += frame->linesize[0];
242 }
243 }
244
cdxl_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * pkt)245 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
246 int *got_frame, AVPacket *pkt)
247 {
248 CDXLVideoContext *c = avctx->priv_data;
249 AVFrame * const p = data;
250 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
251 const uint8_t *buf = pkt->data;
252
253 if (buf_size < 32)
254 return AVERROR_INVALIDDATA;
255 c->type = buf[0];
256 encoding = buf[1] & 7;
257 c->format = buf[1] & 0xE0;
258 w = AV_RB16(&buf[14]);
259 h = AV_RB16(&buf[16]);
260 c->bpp = buf[19];
261 c->palette_size = AV_RB16(&buf[20]);
262 c->palette = buf + 32;
263 c->video = c->palette + c->palette_size;
264 c->video_size = buf_size - c->palette_size - 32;
265
266 if (c->type > 1)
267 return AVERROR_INVALIDDATA;
268 if (c->type == 1 && c->palette_size > 512)
269 return AVERROR_INVALIDDATA;
270 if (c->type == 0 && c->palette_size > 768)
271 return AVERROR_INVALIDDATA;
272 if (buf_size < c->palette_size + 32)
273 return AVERROR_INVALIDDATA;
274 if (c->bpp < 1)
275 return AVERROR_INVALIDDATA;
276 if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) {
277 avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
278 return AVERROR_PATCHWELCOME;
279 }
280
281 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
282 return ret;
283
284 if (c->format == CHUNKY)
285 aligned_width = avctx->width;
286 else
287 aligned_width = FFALIGN(c->avctx->width, 16);
288 c->padded_bits = aligned_width - c->avctx->width;
289 if (c->video_size < aligned_width * avctx->height * (int64_t)c->bpp / 8)
290 return AVERROR_INVALIDDATA;
291 if (!encoding && c->palette_size && c->bpp <= 8 && c->format != CHUNKY) {
292 avctx->pix_fmt = AV_PIX_FMT_PAL8;
293 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8) && c->format != CHUNKY) {
294 if (c->palette_size != (1 << (c->bpp - 1)))
295 return AVERROR_INVALIDDATA;
296 avctx->pix_fmt = AV_PIX_FMT_BGR24;
297 } else if (!encoding && c->bpp == 24 && c->format == CHUNKY &&
298 !c->palette_size) {
299 avctx->pix_fmt = AV_PIX_FMT_RGB24;
300 } else {
301 avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
302 encoding, c->bpp, c->format);
303 return AVERROR_PATCHWELCOME;
304 }
305
306 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
307 return ret;
308 p->pict_type = AV_PICTURE_TYPE_I;
309 p->key_frame = 1;
310
311 if (encoding) {
312 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
313 h * w + AV_INPUT_BUFFER_PADDING_SIZE);
314 if (!c->new_video)
315 return AVERROR(ENOMEM);
316 if (c->bpp == 8)
317 cdxl_decode_ham8(c, p);
318 else
319 cdxl_decode_ham6(c, p);
320 } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
321 cdxl_decode_rgb(c, p);
322 } else {
323 cdxl_decode_raw(c, p);
324 }
325 *got_frame = 1;
326
327 return buf_size;
328 }
329
cdxl_decode_end(AVCodecContext * avctx)330 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
331 {
332 CDXLVideoContext *c = avctx->priv_data;
333
334 av_freep(&c->new_video);
335
336 return 0;
337 }
338
339 AVCodec ff_cdxl_decoder = {
340 .name = "cdxl",
341 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
342 .type = AVMEDIA_TYPE_VIDEO,
343 .id = AV_CODEC_ID_CDXL,
344 .priv_data_size = sizeof(CDXLVideoContext),
345 .init = cdxl_decode_init,
346 .close = cdxl_decode_end,
347 .decode = cdxl_decode_frame,
348 .capabilities = AV_CODEC_CAP_DR1,
349 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
350 };
351