fe0c9297b1075fe01d4bbd089933e8493753aa75
[libav.git] / libavcodec / g2meet.c
1 /*
2 * Go2Webinar decoder
3 * Copyright (c) 2012 Konstantin Shishkov
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 * Go2Webinar decoder
25 */
26
27 #include <inttypes.h>
28 #include <zlib.h>
29
30 #include "libavutil/intreadwrite.h"
31 #include "avcodec.h"
32 #include "bytestream.h"
33 #include "dsputil.h"
34 #include "get_bits.h"
35 #include "internal.h"
36 #include "mjpeg.h"
37
38 enum ChunkType {
39 DISPLAY_INFO = 0xC8,
40 TILE_DATA,
41 CURSOR_POS,
42 CURSOR_SHAPE,
43 CHUNK_CC,
44 CHUNK_CD
45 };
46
47 enum Compression {
48 COMPR_EPIC_J_B = 2,
49 COMPR_KEMPF_J_B,
50 };
51
52 static const uint8_t luma_quant[64] = {
53 8, 6, 5, 8, 12, 20, 26, 31,
54 6, 6, 7, 10, 13, 29, 30, 28,
55 7, 7, 8, 12, 20, 29, 35, 28,
56 7, 9, 11, 15, 26, 44, 40, 31,
57 9, 11, 19, 28, 34, 55, 52, 39,
58 12, 18, 28, 32, 41, 52, 57, 46,
59 25, 32, 39, 44, 52, 61, 60, 51,
60 36, 46, 48, 49, 56, 50, 52, 50
61 };
62
63 static const uint8_t chroma_quant[64] = {
64 9, 9, 12, 24, 50, 50, 50, 50,
65 9, 11, 13, 33, 50, 50, 50, 50,
66 12, 13, 28, 50, 50, 50, 50, 50,
67 24, 33, 50, 50, 50, 50, 50, 50,
68 50, 50, 50, 50, 50, 50, 50, 50,
69 50, 50, 50, 50, 50, 50, 50, 50,
70 50, 50, 50, 50, 50, 50, 50, 50,
71 50, 50, 50, 50, 50, 50, 50, 50,
72 };
73
74 typedef struct JPGContext {
75 DSPContext dsp;
76 ScanTable scantable;
77
78 VLC dc_vlc[2], ac_vlc[2];
79 int prev_dc[3];
80 DECLARE_ALIGNED(16, int16_t, block)[6][64];
81
82 uint8_t *buf;
83 } JPGContext;
84
85 typedef struct G2MContext {
86 JPGContext jc;
87 int version;
88
89 int compression;
90 int width, height, bpp;
91 int tile_width, tile_height;
92 int tiles_x, tiles_y, tile_x, tile_y;
93
94 int got_header;
95
96 uint8_t *framebuf;
97 int framebuf_stride, old_width, old_height;
98
99 uint8_t *synth_tile, *jpeg_tile;
100 int tile_stride, old_tile_w, old_tile_h;
101
102 uint8_t *kempf_buf, *kempf_flags;
103
104 uint8_t *cursor;
105 int cursor_stride;
106 int cursor_fmt;
107 int cursor_w, cursor_h, cursor_x, cursor_y;
108 int cursor_hot_x, cursor_hot_y;
109 } G2MContext;
110
111 static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
112 const uint8_t *val_table, int nb_codes,
113 int is_ac)
114 {
115 uint8_t huff_size[256] = { 0 };
116 uint16_t huff_code[256];
117 uint16_t huff_sym[256];
118 int i;
119
120 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
121
122 for (i = 0; i < 256; i++)
123 huff_sym[i] = i + 16 * is_ac;
124
125 if (is_ac)
126 huff_sym[0] = 16 * 256;
127
128 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
129 huff_code, 2, 2, huff_sym, 2, 2, 0);
130 }
131
132 static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
133 {
134 int ret;
135
136 ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
137 avpriv_mjpeg_val_dc, 12, 0);
138 if (ret)
139 return ret;
140 ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
141 avpriv_mjpeg_val_dc, 12, 0);
142 if (ret)
143 return ret;
144 ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
145 avpriv_mjpeg_val_ac_luminance, 251, 1);
146 if (ret)
147 return ret;
148 ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
149 avpriv_mjpeg_val_ac_chrominance, 251, 1);
150 if (ret)
151 return ret;
152
153 ff_dsputil_init(&c->dsp, avctx);
154 ff_init_scantable(c->dsp.idct_permutation, &c->scantable,
155 ff_zigzag_direct);
156
157 return 0;
158 }
159
160 static av_cold void jpg_free_context(JPGContext *ctx)
161 {
162 int i;
163
164 for (i = 0; i < 2; i++) {
165 ff_free_vlc(&ctx->dc_vlc[i]);
166 ff_free_vlc(&ctx->ac_vlc[i]);
167 }
168
169 av_freep(&ctx->buf);
170 }
171
172 static void jpg_unescape(const uint8_t *src, int src_size,
173 uint8_t *dst, int *dst_size)
174 {
175 const uint8_t *src_end = src + src_size;
176 uint8_t *dst_start = dst;
177
178 while (src < src_end) {
179 uint8_t x = *src++;
180
181 *dst++ = x;
182
183 if (x == 0xFF && !*src)
184 src++;
185 }
186 *dst_size = dst - dst_start;
187 }
188
189 static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
190 int plane, int16_t *block)
191 {
192 int dc, val, pos;
193 const int is_chroma = !!plane;
194 const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
195
196 c->dsp.clear_block(block);
197 dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
198 if (dc < 0)
199 return AVERROR_INVALIDDATA;
200 if (dc)
201 dc = get_xbits(gb, dc);
202 dc = dc * qmat[0] + c->prev_dc[plane];
203 block[0] = dc;
204 c->prev_dc[plane] = dc;
205
206 pos = 0;
207 while (pos < 63) {
208 val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3);
209 if (val < 0)
210 return AVERROR_INVALIDDATA;
211 pos += val >> 4;
212 val &= 0xF;
213 if (pos > 63)
214 return val ? AVERROR_INVALIDDATA : 0;
215 if (val) {
216 int nbits = val;
217
218 val = get_xbits(gb, nbits);
219 val *= qmat[ff_zigzag_direct[pos]];
220 block[c->scantable.permutated[pos]] = val;
221 }
222 }
223 return 0;
224 }
225
226 static inline void yuv2rgb(uint8_t *out, int Y, int U, int V)
227 {
228 out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
229 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
230 out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
231 }
232
233 static int jpg_decode_data(JPGContext *c, int width, int height,
234 const uint8_t *src, int src_size,
235 uint8_t *dst, int dst_stride,
236 const uint8_t *mask, int mask_stride, int num_mbs,
237 int swapuv)
238 {
239 GetBitContext gb;
240 int mb_w, mb_h, mb_x, mb_y, i, j;
241 int bx, by;
242 int unesc_size;
243 int ret;
244
245 if ((ret = av_reallocp(&c->buf,
246 src_size + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
247 return ret;
248 jpg_unescape(src, src_size, c->buf, &unesc_size);
249 memset(c->buf + unesc_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
250 init_get_bits(&gb, c->buf, unesc_size * 8);
251
252 width = FFALIGN(width, 16);
253 mb_w = width >> 4;
254 mb_h = (height + 15) >> 4;
255
256 if (!num_mbs)
257 num_mbs = mb_w * mb_h * 4;
258
259 for (i = 0; i < 3; i++)
260 c->prev_dc[i] = 1024;
261 bx = by = 0;
262 c->dsp.clear_blocks(c->block[0]);
263 for (mb_y = 0; mb_y < mb_h; mb_y++) {
264 for (mb_x = 0; mb_x < mb_w; mb_x++) {
265 if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
266 !mask[mb_x * 2 + mask_stride] &&
267 !mask[mb_x * 2 + 1 + mask_stride]) {
268 bx += 16;
269 continue;
270 }
271 for (j = 0; j < 2; j++) {
272 for (i = 0; i < 2; i++) {
273 if (mask && !mask[mb_x * 2 + i + j * mask_stride])
274 continue;
275 num_mbs--;
276 if ((ret = jpg_decode_block(c, &gb, 0,
277 c->block[i + j * 2])) != 0)
278 return ret;
279 c->dsp.idct(c->block[i + j * 2]);
280 }
281 }
282 for (i = 1; i < 3; i++) {
283 if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
284 return ret;
285 c->dsp.idct(c->block[i + 3]);
286 }
287
288 for (j = 0; j < 16; j++) {
289 uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
290 for (i = 0; i < 16; i++) {
291 int Y, U, V;
292
293 Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
294 U = c->block[4 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
295 V = c->block[5 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
296 yuv2rgb(out + i * 3, Y, U, V);
297 }
298 }
299
300 if (!num_mbs)
301 return 0;
302 bx += 16;
303 }
304 bx = 0;
305 by += 16;
306 if (mask)
307 mask += mask_stride * 2;
308 }
309
310 return 0;
311 }
312
313 static void kempf_restore_buf(const uint8_t *src, int len,
314 uint8_t *dst, int stride,
315 const uint8_t *jpeg_tile, int tile_stride,
316 int width, int height,
317 const uint8_t *pal, int npal, int tidx)
318 {
319 GetBitContext gb;
320 int i, j, nb, col;
321
322 init_get_bits(&gb, src, len * 8);
323
324 if (npal <= 2) nb = 1;
325 else if (npal <= 4) nb = 2;
326 else if (npal <= 16) nb = 4;
327 else nb = 8;
328
329 for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
330 if (get_bits(&gb, 8))
331 continue;
332 for (i = 0; i < width; i++) {
333 col = get_bits(&gb, nb);
334 if (col != tidx)
335 memcpy(dst + i * 3, pal + col * 3, 3);
336 else
337 memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
338 }
339 }
340 }
341
342 static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
343 const uint8_t *src, int src_size)
344 {
345 int width, height;
346 int hdr, zsize, npal, tidx = -1, ret;
347 int i, j;
348 const uint8_t *src_end = src + src_size;
349 uint8_t pal[768], transp[3];
350 uLongf dlen = (c->tile_width + 1) * c->tile_height;
351 int sub_type;
352 int nblocks, cblocks, bstride;
353 int bits, bitbuf, coded;
354 uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
355 tile_y * c->tile_height * c->framebuf_stride;
356
357 if (src_size < 2)
358 return AVERROR_INVALIDDATA;
359
360 width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
361 height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
362
363 hdr = *src++;
364 sub_type = hdr >> 5;
365 if (sub_type == 0) {
366 int j;
367 memcpy(transp, src, 3);
368 src += 3;
369 for (j = 0; j < height; j++, dst += c->framebuf_stride)
370 for (i = 0; i < width; i++)
371 memcpy(dst + i * 3, transp, 3);
372 return 0;
373 } else if (sub_type == 1) {
374 return jpg_decode_data(&c->jc, width, height, src, src_end - src,
375 dst, c->framebuf_stride, NULL, 0, 0, 0);
376 }
377
378 if (sub_type != 2) {
379 memcpy(transp, src, 3);
380 src += 3;
381 }
382 npal = *src++ + 1;
383 memcpy(pal, src, npal * 3);
384 src += npal * 3;
385 if (sub_type != 2) {
386 for (i = 0; i < npal; i++) {
387 if (!memcmp(pal + i * 3, transp, 3)) {
388 tidx = i;
389 break;
390 }
391 }
392 }
393
394 if (src_end - src < 2)
395 return 0;
396 zsize = (src[0] << 8) | src[1];
397 src += 2;
398
399 if (src_end - src < zsize)
400 return AVERROR_INVALIDDATA;
401
402 ret = uncompress(c->kempf_buf, &dlen, src, zsize);
403 if (ret)
404 return AVERROR_INVALIDDATA;
405 src += zsize;
406
407 if (sub_type == 2) {
408 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
409 NULL, 0, width, height, pal, npal, tidx);
410 return 0;
411 }
412
413 nblocks = *src++ + 1;
414 cblocks = 0;
415 bstride = FFALIGN(width, 16) >> 3;
416 // blocks are coded LSB and we need normal bitreader for JPEG data
417 bits = 0;
418 for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
419 for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
420 if (!bits) {
421 bitbuf = *src++;
422 bits = 8;
423 }
424 coded = bitbuf & 1;
425 bits--;
426 bitbuf >>= 1;
427 cblocks += coded;
428 if (cblocks > nblocks)
429 return AVERROR_INVALIDDATA;
430 c->kempf_flags[j * 2 + i * 2 * bstride] =
431 c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
432 c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
433 c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
434 }
435 }
436
437 memset(c->jpeg_tile, 0, c->tile_stride * height);
438 jpg_decode_data(&c->jc, width, height, src, src_end - src,
439 c->jpeg_tile, c->tile_stride,
440 c->kempf_flags, bstride, nblocks * 4, 0);
441
442 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
443 c->jpeg_tile, c->tile_stride,
444 width, height, pal, npal, tidx);
445
446 return 0;
447 }
448
449 static int g2m_init_buffers(G2MContext *c)
450 {
451 int aligned_height;
452
453 if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
454 c->framebuf_stride = FFALIGN(c->width * 3, 16);
455 aligned_height = FFALIGN(c->height, 16);
456 av_free(c->framebuf);
457 c->framebuf = av_mallocz(c->framebuf_stride * aligned_height);
458 if (!c->framebuf)
459 return AVERROR(ENOMEM);
460 }
461 if (!c->synth_tile || !c->jpeg_tile ||
462 c->old_tile_w < c->tile_width ||
463 c->old_tile_h < c->tile_height) {
464 c->tile_stride = FFALIGN(c->tile_width * 3, 16);
465 aligned_height = FFALIGN(c->tile_height, 16);
466 av_free(c->synth_tile);
467 av_free(c->jpeg_tile);
468 av_free(c->kempf_buf);
469 av_free(c->kempf_flags);
470 c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
471 c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
472 c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height
473 + FF_INPUT_BUFFER_PADDING_SIZE);
474 c->kempf_flags = av_mallocz( c->tile_width * aligned_height);
475 if (!c->synth_tile || !c->jpeg_tile ||
476 !c->kempf_buf || !c->kempf_flags)
477 return AVERROR(ENOMEM);
478 }
479
480 return 0;
481 }
482
483 static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
484 GetByteContext *gb)
485 {
486 int i, j, k;
487 uint8_t *dst;
488 uint32_t bits;
489 uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
490 uint32_t cursor_hot_x, cursor_hot_y;
491 int cursor_fmt, err;
492
493 cur_size = bytestream2_get_be32(gb);
494 cursor_w = bytestream2_get_byte(gb);
495 cursor_h = bytestream2_get_byte(gb);
496 cursor_hot_x = bytestream2_get_byte(gb);
497 cursor_hot_y = bytestream2_get_byte(gb);
498 cursor_fmt = bytestream2_get_byte(gb);
499
500 cursor_stride = FFALIGN(cursor_w, 32) * 4;
501
502 if (cursor_w < 1 || cursor_w > 256 ||
503 cursor_h < 1 || cursor_h > 256) {
504 av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n",
505 cursor_w, cursor_h);
506 return AVERROR_INVALIDDATA;
507 }
508 if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
509 av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n",
510 cursor_hot_x, cursor_hot_y);
511 cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
512 cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
513 }
514 if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
515 c->cursor_w * c->cursor_h / 4 > cur_size) {
516 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n",
517 cur_size, bytestream2_get_bytes_left(gb));
518 return AVERROR_INVALIDDATA;
519 }
520 if (cursor_fmt != 1 && cursor_fmt != 32) {
521 avpriv_report_missing_feature(avctx, "Cursor format %d",
522 cursor_fmt);
523 return AVERROR_PATCHWELCOME;
524 }
525
526 if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
527 av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
528 return err;
529 }
530
531 c->cursor_w = cursor_w;
532 c->cursor_h = cursor_h;
533 c->cursor_hot_x = cursor_hot_x;
534 c->cursor_hot_y = cursor_hot_y;
535 c->cursor_fmt = cursor_fmt;
536 c->cursor_stride = cursor_stride;
537
538 dst = c->cursor;
539 switch (c->cursor_fmt) {
540 case 1: // old monochrome
541 for (j = 0; j < c->cursor_h; j++) {
542 for (i = 0; i < c->cursor_w; i += 32) {
543 bits = bytestream2_get_be32(gb);
544 for (k = 0; k < 32; k++) {
545 dst[0] = !!(bits & 0x80000000);
546 dst += 4;
547 bits <<= 1;
548 }
549 }
550 dst += c->cursor_stride - c->cursor_w * 4;
551 }
552
553 dst = c->cursor;
554 for (j = 0; j < c->cursor_h; j++) {
555 for (i = 0; i < c->cursor_w; i += 32) {
556 bits = bytestream2_get_be32(gb);
557 for (k = 0; k < 32; k++) {
558 int mask_bit = !!(bits & 0x80000000);
559 switch (dst[0] * 2 + mask_bit) {
560 case 0:
561 dst[0] = 0xFF;
562 dst[1] = 0x00;
563 dst[2] = 0x00;
564 dst[3] = 0x00;
565 break;
566 case 1:
567 dst[0] = 0xFF;
568 dst[1] = 0xFF;
569 dst[2] = 0xFF;
570 dst[3] = 0xFF;
571 break;
572 default:
573 dst[0] = 0x00;
574 dst[1] = 0x00;
575 dst[2] = 0x00;
576 dst[3] = 0x00;
577 }
578 dst += 4;
579 bits <<= 1;
580 }
581 }
582 dst += c->cursor_stride - c->cursor_w * 4;
583 }
584 break;
585 case 32: // full colour
586 /* skip monochrome version of the cursor and decode RGBA instead */
587 bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
588 for (j = 0; j < c->cursor_h; j++) {
589 for (i = 0; i < c->cursor_w; i++) {
590 int val = bytestream2_get_be32(gb);
591 *dst++ = val >> 0;
592 *dst++ = val >> 8;
593 *dst++ = val >> 16;
594 *dst++ = val >> 24;
595 }
596 dst += c->cursor_stride - c->cursor_w * 4;
597 }
598 break;
599 default:
600 return AVERROR_PATCHWELCOME;
601 }
602 return 0;
603 }
604
605 #define APPLY_ALPHA(src, new, alpha) \
606 src = (src * (256 - alpha) + new * alpha) >> 8
607
608 static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
609 {
610 int i, j;
611 int x, y, w, h;
612 const uint8_t *cursor;
613
614 if (!c->cursor)
615 return;
616
617 x = c->cursor_x - c->cursor_hot_x;
618 y = c->cursor_y - c->cursor_hot_y;
619
620 cursor = c->cursor;
621 w = c->cursor_w;
622 h = c->cursor_h;
623
624 if (x + w > c->width)
625 w = c->width - x;
626 if (y + h > c->height)
627 h = c->height - y;
628 if (x < 0) {
629 w += x;
630 cursor += -x * 4;
631 } else {
632 dst += x * 3;
633 }
634 if (y < 0) {
635 h += y;
636 cursor += -y * c->cursor_stride;
637 } else {
638 dst += y * stride;
639 }
640 if (w < 0 || h < 0)
641 return;
642
643 for (j = 0; j < h; j++) {
644 for (i = 0; i < w; i++) {
645 uint8_t alpha = cursor[i * 4];
646 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
647 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
648 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
649 }
650 dst += stride;
651 cursor += c->cursor_stride;
652 }
653 }
654
655 static int g2m_decode_frame(AVCodecContext *avctx, void *data,
656 int *got_picture_ptr, AVPacket *avpkt)
657 {
658 const uint8_t *buf = avpkt->data;
659 int buf_size = avpkt->size;
660 G2MContext *c = avctx->priv_data;
661 AVFrame *pic = data;
662 GetByteContext bc, tbc;
663 int magic;
664 int got_header = 0;
665 uint32_t chunk_size, r_mask, g_mask, b_mask;
666 int chunk_type, chunk_start;
667 int i;
668 int ret;
669
670 if (buf_size < 12) {
671 av_log(avctx, AV_LOG_ERROR,
672 "Frame should have at least 12 bytes, got %d instead\n",
673 buf_size);
674 return AVERROR_INVALIDDATA;
675 }
676
677 bytestream2_init(&bc, buf, buf_size);
678
679 magic = bytestream2_get_be32(&bc);
680 if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
681 (magic & 0xF) < 2 || (magic & 0xF) > 4) {
682 av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
683 return AVERROR_INVALIDDATA;
684 }
685
686 if ((magic & 0xF) != 4) {
687 av_log(avctx, AV_LOG_ERROR, "G2M2 and G2M3 are not yet supported\n");
688 return AVERROR(ENOSYS);
689 }
690
691 while (bytestream2_get_bytes_left(&bc) > 5) {
692 chunk_size = bytestream2_get_le32(&bc) - 1;
693 chunk_type = bytestream2_get_byte(&bc);
694 chunk_start = bytestream2_tell(&bc);
695 if (chunk_size > bytestream2_get_bytes_left(&bc)) {
696 av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n",
697 chunk_size, chunk_type);
698 break;
699 }
700 switch (chunk_type) {
701 case DISPLAY_INFO:
702 c->got_header = 0;
703 if (chunk_size < 21) {
704 av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n",
705 chunk_size);
706 break;
707 }
708 c->width = bytestream2_get_be32(&bc);
709 c->height = bytestream2_get_be32(&bc);
710 if (c->width < 16 || c->width > avctx->width ||
711 c->height < 16 || c->height > avctx->height) {
712 av_log(avctx, AV_LOG_ERROR,
713 "Invalid frame dimensions %dx%d\n",
714 c->width, c->height);
715 ret = AVERROR_INVALIDDATA;
716 goto header_fail;
717 }
718 if (c->width != avctx->width || c->height != avctx->height)
719 ff_set_dimensions(avctx, c->width, c->height);
720 c->compression = bytestream2_get_be32(&bc);
721 if (c->compression != 2 && c->compression != 3) {
722 av_log(avctx, AV_LOG_ERROR,
723 "Unknown compression method %d\n",
724 c->compression);
725 return AVERROR_PATCHWELCOME;
726 }
727 c->tile_width = bytestream2_get_be32(&bc);
728 c->tile_height = bytestream2_get_be32(&bc);
729 if (!c->tile_width || !c->tile_height ||
730 ((c->tile_width | c->tile_height) & 0xF)) {
731 av_log(avctx, AV_LOG_ERROR,
732 "Invalid tile dimensions %dx%d\n",
733 c->tile_width, c->tile_height);
734 ret = AVERROR_INVALIDDATA;
735 goto header_fail;
736 }
737 c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
738 c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
739 c->bpp = bytestream2_get_byte(&bc);
740 if (c->bpp == 32) {
741 if (bytestream2_get_bytes_left(&bc) < 16 ||
742 (chunk_size - 21) < 16) {
743 av_log(avctx, AV_LOG_ERROR,
744 "Display info: missing bitmasks!\n");
745 return AVERROR_INVALIDDATA;
746 }
747 r_mask = bytestream2_get_be32(&bc);
748 g_mask = bytestream2_get_be32(&bc);
749 b_mask = bytestream2_get_be32(&bc);
750 if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
751 av_log(avctx, AV_LOG_ERROR,
752 "Invalid or unsupported bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32"\n",
753 r_mask, g_mask, b_mask);
754 return AVERROR_PATCHWELCOME;
755 }
756 } else {
757 avpriv_request_sample(avctx, "bpp=%d", c->bpp);
758 return AVERROR_PATCHWELCOME;
759 }
760 if (g2m_init_buffers(c)) {
761 ret = AVERROR(ENOMEM);
762 goto header_fail;
763 }
764 got_header = 1;
765 break;
766 case TILE_DATA:
767 if (!c->tiles_x || !c->tiles_y) {
768 av_log(avctx, AV_LOG_WARNING,
769 "No display info - skipping tile\n");
770 break;
771 }
772 if (chunk_size < 2) {
773 av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %d\n",
774 chunk_size);
775 break;
776 }
777 c->tile_x = bytestream2_get_byte(&bc);
778 c->tile_y = bytestream2_get_byte(&bc);
779 if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
780 av_log(avctx, AV_LOG_ERROR,
781 "Invalid tile pos %d,%d (in %dx%d grid)\n",
782 c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
783 break;
784 }
785 ret = 0;
786 switch (c->compression) {
787 case COMPR_EPIC_J_B:
788 av_log(avctx, AV_LOG_ERROR,
789 "ePIC j-b compression is not implemented yet\n");
790 return AVERROR(ENOSYS);
791 case COMPR_KEMPF_J_B:
792 ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
793 buf + bytestream2_tell(&bc),
794 chunk_size - 2);
795 break;
796 }
797 if (ret && c->framebuf)
798 av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
799 c->tile_x, c->tile_y);
800 break;
801 case CURSOR_POS:
802 if (chunk_size < 5) {
803 av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
804 chunk_size);
805 break;
806 }
807 c->cursor_x = bytestream2_get_be16(&bc);
808 c->cursor_y = bytestream2_get_be16(&bc);
809 break;
810 case CURSOR_SHAPE:
811 if (chunk_size < 8) {
812 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
813 chunk_size);
814 break;
815 }
816 bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
817 chunk_size - 4);
818 g2m_load_cursor(avctx, c, &tbc);
819 break;
820 case CHUNK_CC:
821 case CHUNK_CD:
822 break;
823 default:
824 av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02"PRIX32"\n",
825 chunk_type);
826 }
827
828 /* navigate to next chunk */
829 bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
830 }
831 if (got_header)
832 c->got_header = 1;
833
834 if (c->width && c->height) {
835 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) {
836 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
837 return ret;
838 }
839
840 pic->key_frame = got_header;
841 pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
842
843 for (i = 0; i < avctx->height; i++)
844 memcpy(pic->data[0] + i * pic->linesize[0],
845 c->framebuf + i * c->framebuf_stride,
846 c->width * 3);
847 g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
848
849 *got_picture_ptr = 1;
850 }
851
852 return buf_size;
853
854 header_fail:
855 c->width =
856 c->height = 0;
857 c->tiles_x =
858 c->tiles_y = 0;
859 return ret;
860 }
861
862 static av_cold int g2m_decode_init(AVCodecContext *avctx)
863 {
864 G2MContext *const c = avctx->priv_data;
865 int ret;
866
867 if ((ret = jpg_init(avctx, &c->jc)) != 0) {
868 av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
869 jpg_free_context(&c->jc);
870 return AVERROR(ENOMEM);
871 }
872
873 avctx->pix_fmt = AV_PIX_FMT_RGB24;
874
875 return 0;
876 }
877
878 static av_cold int g2m_decode_end(AVCodecContext *avctx)
879 {
880 G2MContext *const c = avctx->priv_data;
881
882 jpg_free_context(&c->jc);
883
884 av_freep(&c->kempf_buf);
885 av_freep(&c->kempf_flags);
886 av_freep(&c->synth_tile);
887 av_freep(&c->jpeg_tile);
888 av_freep(&c->cursor);
889 av_freep(&c->framebuf);
890
891 return 0;
892 }
893
894 AVCodec ff_g2m_decoder = {
895 .name = "g2m",
896 .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
897 .type = AVMEDIA_TYPE_VIDEO,
898 .id = AV_CODEC_ID_G2M,
899 .priv_data_size = sizeof(G2MContext),
900 .init = g2m_decode_init,
901 .close = g2m_decode_end,
902 .decode = g2m_decode_frame,
903 .capabilities = CODEC_CAP_DR1,
904 };