1 /*
2 * Kodak PhotoCD (a.k.a. ImagePac) image decoder
3 *
4 * Copyright (c) 1996-2002 Gerd Knorr
5 * Copyright (c) 2010 Kenneth Vermeirsch
6 * Copyright (c) 2020 Paul B Mahol
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 /**
26 * @file
27 * Kodak PhotoCD (a.k.a. ImagePac) image decoder
28 *
29 * Supports resolutions up to 3072x2048.
30 */
31
32 #define CACHED_BITSTREAM_READER !ARCH_X86_32
33
34 #include "libavutil/intreadwrite.h"
35 #include "libavutil/opt.h"
36 #include "avcodec.h"
37 #include "bytestream.h"
38 #include "codec_internal.h"
39 #include "get_bits.h"
40 #include "internal.h"
41 #include "thread.h"
42
43 typedef struct PhotoCDContext {
44 AVClass *class;
45 int lowres;
46
47 GetByteContext gb;
48 int thumbnails; //* number of thumbnails; 0 for normal image */
49 int resolution;
50 int orientation;
51
52 int streampos;
53
54 uint8_t bits[256];
55 uint16_t codes[256];
56 uint8_t syms[256];
57
58 VLC vlc[3];
59 } PhotoCDContext;
60
61 typedef struct ImageInfo {
62 uint32_t start;
63 uint16_t width, height;
64 } ImageInfo;
65
66 static const ImageInfo img_info[6] = {
67 {8192, 192, 128},
68 {47104, 384, 256},
69 {196608, 768, 512},
70 {0, 1536, 1024},
71 {0, 3072, 2048},
72 {0, 6144, 4096},
73 };
74
interp_lowres(PhotoCDContext * s,AVFrame * picture,int width,int height)75 static av_noinline void interp_lowres(PhotoCDContext *s, AVFrame *picture,
76 int width, int height)
77 {
78 GetByteContext *gb = &s->gb;
79 int start = s->streampos + img_info[2].start;
80 uint8_t *ptr, *ptr1, *ptr2;
81 uint8_t *dst;
82 int fill;
83
84 ptr = picture->data[0];
85 ptr1 = picture->data[1];
86 ptr2 = picture->data[2];
87
88 bytestream2_seek(gb, start, SEEK_SET);
89
90 for (int y = 0; y < height; y += 2) {
91 dst = ptr;
92 for (int x = 0; x < width - 1; x++) {
93 fill = bytestream2_get_byte(gb);
94 *(dst++) = fill;
95 *(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
96 }
97 fill = bytestream2_get_byte(gb);
98 *(dst++) = fill;
99 *(dst++) = fill;
100
101 ptr += picture->linesize[0] << 1;
102
103 dst = ptr;
104 for (int x = 0; x < width - 1; x++) {
105 fill = bytestream2_get_byte(gb);
106 *(dst++) = fill;
107 *(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
108 }
109 fill = bytestream2_get_byte(gb);
110 *(dst++) = fill;
111 *(dst++) = fill;
112
113 ptr += picture->linesize[0] << 1;
114
115 dst = ptr1;
116 for (int x = 0; x < (width >> 1) - 1; x++) {
117 fill = bytestream2_get_byte(gb);
118 *(dst++) = fill;
119 *(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
120 }
121 fill = bytestream2_get_byte(gb);
122 *(dst++) = fill;
123 *(dst++) = fill;
124
125 ptr1 += picture->linesize[1] << 1;
126
127 dst = ptr2;
128 for (int x = 0; x < (width >> 1) - 1; x++) {
129 fill = bytestream2_get_byte(gb);
130 *(dst++) = fill;
131 *(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
132 }
133 fill = bytestream2_get_byte(gb);
134 *(dst++) = fill;
135 *(dst++) = fill;
136
137 ptr2 += picture->linesize[2] << 1;
138 }
139
140 s->streampos += bytestream2_tell(gb) - start;
141 }
142
interp_lines(uint8_t * ptr,int linesize,int width,int height)143 static av_noinline void interp_lines(uint8_t *ptr, int linesize,
144 int width, int height)
145 {
146 const uint8_t *src1;
147 uint8_t *dst;
148 int x;
149
150 for (int y = 0; y < height - 2; y += 2) {
151 const uint8_t *src1 = ptr;
152 uint8_t *dst = ptr + linesize;
153 const uint8_t *src2 = dst + linesize;
154 for (x = 0; x < width - 2; x += 2) {
155 dst[x] = (src1[x] + src2[x] + 1) >> 1;
156 dst[x + 1] = (src1[x] + src2[x] + src1[x + 2] + src2[x + 2] + 2) >> 2;
157 }
158 dst[x] = dst[x + 1] = (src1[x] + src2[x] + 1) >> 1;
159
160 ptr += linesize << 1;
161 }
162
163 src1 = ptr;
164 dst = ptr + linesize;
165 for (x = 0; x < width - 2; x += 2) {
166 dst[x] = src1[x];
167 dst[x + 1] = (src1[x] + src1[x + 2] + 1) >> 1;
168 }
169 dst[x] = dst[x + 1] = src1[x];
170 }
171
interp_pixels(uint8_t * ptr,int linesize,int width,int height)172 static av_noinline void interp_pixels(uint8_t *ptr, int linesize,
173 int width, int height)
174 {
175 for (int y = height - 2; y >= 0; y -= 2) {
176 const uint8_t *src = ptr + (y >> 1) * linesize;
177 uint8_t *dst = ptr + y * linesize;
178
179 dst[width - 2] = dst[width - 1] = src[(width >> 1) - 1];
180 for (int x = width - 4; x >= 0; x -= 2) {
181 dst[x] = src[x >> 1];
182 dst[x + 1] = (src[x >> 1] + src[(x >> 1) + 1] + 1) >> 1;
183 }
184 }
185 }
186
read_hufftable(AVCodecContext * avctx,VLC * vlc)187 static av_noinline int read_hufftable(AVCodecContext *avctx, VLC *vlc)
188 {
189 PhotoCDContext *s = avctx->priv_data;
190 GetByteContext *gb = &s->gb;
191 int start = s->streampos;
192 int count, ret;
193
194 bytestream2_seek(gb, start, SEEK_SET);
195
196 count = bytestream2_get_byte(gb) + 1;
197 if (bytestream2_get_bytes_left(gb) < count * 4)
198 return AVERROR_INVALIDDATA;
199
200 for (int j = 0; j < count; j++) {
201 const int bit = bytestream2_get_byteu(gb) + 1;
202 const int code = bytestream2_get_be16u(gb);
203 const int sym = bytestream2_get_byteu(gb);
204
205 if (bit > 16)
206 return AVERROR_INVALIDDATA;
207
208 s->bits[j] = bit;
209 s->codes[j] = code >> (16 - bit);
210 s->syms[j] = sym;
211 }
212
213 ff_free_vlc(vlc);
214 ret = ff_init_vlc_sparse(vlc, 12, count,
215 s->bits, sizeof(*s->bits), sizeof(*s->bits),
216 s->codes, sizeof(*s->codes), sizeof(*s->codes),
217 s->syms, sizeof(*s->syms), sizeof(*s->syms), 0);
218
219 s->streampos = bytestream2_tell(gb);
220
221 return ret;
222 }
223
decode_huff(AVCodecContext * avctx,AVFrame * frame,int target_res,int curr_res)224 static av_noinline int decode_huff(AVCodecContext *avctx, AVFrame *frame,
225 int target_res, int curr_res)
226 {
227 PhotoCDContext *s = avctx->priv_data;
228 GetBitContext g;
229 GetByteContext *gb = &s->gb;
230 int ret, y = 0, type, height;
231 int start = s->streampos;
232 unsigned shiftreg;
233 const int scaling = target_res - curr_res;
234 const uint8_t type2idx[] = { 0, 0xff, 1, 2 };
235
236 bytestream2_seek(gb, start, SEEK_SET);
237 ret = init_get_bits8(&g, gb->buffer, bytestream2_get_bytes_left(gb));
238 if (ret < 0)
239 return ret;
240
241 height = img_info[curr_res].height;
242
243 while (y < height) {
244 uint8_t *data;
245 int x2, idx;
246
247 for (; get_bits_left(&g) > 0;) {
248 if (show_bits(&g, 12) == 0xfff)
249 break;
250 skip_bits(&g, 8);
251 }
252
253 shiftreg = show_bits(&g, 24);
254 while (shiftreg != 0xfffffe) {
255 if (get_bits_left(&g) <= 0)
256 return AVERROR_INVALIDDATA;
257 skip_bits(&g, 1);
258 shiftreg = show_bits(&g, 24);
259 }
260 skip_bits(&g, 24);
261 y = show_bits(&g, 15) & 0x1fff;
262 if (y >= height)
263 break;
264 type = get_bits(&g, 2);
265 skip_bits(&g, 14);
266
267 if (type == 1)
268 return AVERROR_INVALIDDATA;
269 idx = type2idx[type];
270
271 data = frame->data[idx] + (y >> !!idx) * frame->linesize[idx];
272
273 x2 = avctx->width >> (scaling + !!idx);
274 for (int x = 0; x < x2; x++) {
275 int m;
276
277 if (get_bits_left(&g) <= 0)
278 return AVERROR_INVALIDDATA;
279 m = get_vlc2(&g, s->vlc[idx].table, s->vlc[idx].bits, 2);
280 if (m < 0)
281 return AVERROR_INVALIDDATA;
282 m = sign_extend(m, 8);
283 data[x] = av_clip_uint8(data[x] + m);
284 }
285 }
286
287 s->streampos += (get_bits_count(&g) + 7) >> 3;
288 s->streampos = (s->streampos + 0x6000 + 2047) & ~0x7ff;
289
290 return 0;
291 }
292
photocd_decode_frame(AVCodecContext * avctx,AVFrame * p,int * got_frame,AVPacket * avpkt)293 static int photocd_decode_frame(AVCodecContext *avctx, AVFrame *p,
294 int *got_frame, AVPacket *avpkt)
295 {
296 PhotoCDContext *s = avctx->priv_data;
297 const uint8_t *buf = avpkt->data;
298 GetByteContext *gb = &s->gb;
299 uint8_t *ptr, *ptr1, *ptr2;
300 int ret;
301
302 if (avpkt->size < img_info[0].start)
303 return AVERROR_INVALIDDATA;
304
305 if (!memcmp("PCD_OPA", buf, 7)) {
306 s->thumbnails = AV_RL16(buf + 10);
307 av_log(avctx, AV_LOG_WARNING, "this is a thumbnails file, "
308 "reading first thumbnail only\n");
309 } else if (avpkt->size < 786432) {
310 return AVERROR_INVALIDDATA;
311 } else if (memcmp("PCD_IPI", buf + 0x800, 7)) {
312 return AVERROR_INVALIDDATA;
313 }
314
315 s->orientation = s->thumbnails ? buf[12] & 3 : buf[0x48] & 3;
316
317 if (s->thumbnails)
318 s->resolution = 0;
319 else if (avpkt->size <= 788480)
320 s->resolution = 2;
321 else
322 s->resolution = av_clip(4 - s->lowres, 0, 4);
323
324 ret = ff_set_dimensions(avctx, img_info[s->resolution].width, img_info[s->resolution].height);
325 if (ret < 0)
326 return ret;
327
328 if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
329 return ret;
330
331 p->pict_type = AV_PICTURE_TYPE_I;
332 p->key_frame = 1;
333
334 bytestream2_init(gb, avpkt->data, avpkt->size);
335
336 if (s->resolution < 3) {
337 ptr = p->data[0];
338 ptr1 = p->data[1];
339 ptr2 = p->data[2];
340
341 if (s->thumbnails)
342 bytestream2_seek(gb, 10240, SEEK_SET);
343 else
344 bytestream2_seek(gb, img_info[s->resolution].start, SEEK_SET);
345
346 for (int y = 0; y < avctx->height; y += 2) {
347 bytestream2_get_buffer(gb, ptr, avctx->width);
348 ptr += p->linesize[0];
349
350 bytestream2_get_buffer(gb, ptr, avctx->width);
351 ptr += p->linesize[0];
352
353 bytestream2_get_buffer(gb, ptr1, avctx->width >> 1);
354 ptr1 += p->linesize[1];
355
356 bytestream2_get_buffer(gb, ptr2, avctx->width >> 1);
357 ptr2 += p->linesize[2];
358 }
359 } else {
360 s->streampos = 0;
361 ptr = p->data[0];
362 ptr1 = p->data[1];
363 ptr2 = p->data[2];
364
365 interp_lowres(s, p, img_info[2].width, img_info[2].height);
366
367 interp_lines(ptr1, p->linesize[1], img_info[2].width, img_info[2].height);
368 interp_lines(ptr2, p->linesize[2], img_info[2].width, img_info[2].height);
369
370 if (s->resolution == 4) {
371 interp_pixels(ptr1, p->linesize[1], img_info[3].width, img_info[3].height);
372 interp_lines (ptr1, p->linesize[1], img_info[3].width, img_info[3].height);
373 interp_pixels(ptr2, p->linesize[2], img_info[3].width, img_info[3].height);
374 interp_lines (ptr2, p->linesize[2], img_info[3].width, img_info[3].height);
375 }
376
377 interp_lines(ptr, p->linesize[0], img_info[3].width, img_info[3].height);
378
379 s->streampos = 0xc2000;
380 for (int n = 0; n < 3; n++) {
381 if ((ret = read_hufftable(avctx, &s->vlc[n])) < 0)
382 return ret;
383 }
384 s->streampos = (s->streampos + 2047) & ~0x3ff;
385 if (decode_huff(avctx, p, s->resolution, 3) < 0)
386 return AVERROR_INVALIDDATA;
387
388 if (s->resolution == 4) {
389 interp_pixels(ptr, p->linesize[0], img_info[4].width, img_info[4].height);
390 interp_lines (ptr, p->linesize[0], img_info[4].width, img_info[4].height);
391
392 for (int n = 0; n < 3; n++) {
393 if ((ret = read_hufftable(avctx, &s->vlc[n])) < 0)
394 return ret;
395 }
396 s->streampos = (s->streampos + 2047) & ~0x3ff;
397 if (decode_huff(avctx, p, 4, 4) < 0)
398 return AVERROR_INVALIDDATA;
399 }
400 }
401
402 {
403 ptr1 = p->data[1];
404 ptr2 = p->data[2];
405
406 for (int y = 0; y < avctx->height >> 1; y++) {
407 for (int x = 0; x < avctx->width >> 1; x++) {
408 ptr1[x] = av_clip_uint8(ptr1[x] - 28);
409 ptr2[x] = av_clip_uint8(ptr2[x] - 9);
410 }
411
412 ptr1 += p->linesize[1];
413 ptr2 += p->linesize[2];
414 }
415 }
416
417 *got_frame = 1;
418
419 return 0;
420 }
421
photocd_decode_init(AVCodecContext * avctx)422 static av_cold int photocd_decode_init(AVCodecContext *avctx)
423 {
424 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
425 avctx->colorspace = AVCOL_SPC_BT709;
426 avctx->color_primaries = AVCOL_PRI_BT709;
427 avctx->color_trc = AVCOL_TRC_IEC61966_2_1;
428 avctx->color_range = AVCOL_RANGE_JPEG;
429
430 return 0;
431 }
432
photocd_decode_close(AVCodecContext * avctx)433 static av_cold int photocd_decode_close(AVCodecContext *avctx)
434 {
435 PhotoCDContext *s = avctx->priv_data;
436
437 for (int i = 0; i < 3; i++)
438 ff_free_vlc(&s->vlc[i]);
439
440 return 0;
441 }
442
443 #define OFFSET(x) offsetof(PhotoCDContext, x)
444 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
445
446 static const AVOption options[] = {
447 { "lowres", "Lower the decoding resolution by a power of two",
448 OFFSET(lowres), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 4, VD },
449 { NULL },
450 };
451
452 static const AVClass photocd_class = {
453 .class_name = "photocd",
454 .item_name = av_default_item_name,
455 .option = options,
456 .version = LIBAVUTIL_VERSION_INT,
457 };
458
459 const FFCodec ff_photocd_decoder = {
460 .p.name = "photocd",
461 .p.type = AVMEDIA_TYPE_VIDEO,
462 .p.id = AV_CODEC_ID_PHOTOCD,
463 .priv_data_size = sizeof(PhotoCDContext),
464 .p.priv_class = &photocd_class,
465 .init = photocd_decode_init,
466 .close = photocd_decode_close,
467 FF_CODEC_DECODE_CB(photocd_decode_frame),
468 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
469 .p.long_name = NULL_IF_CONFIG_SMALL("Kodak Photo CD"),
470 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
471 };
472