g2meet: K&R formatting cosmetics
[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
32 #include "avcodec.h"
33 #include "blockdsp.h"
34 #include "bytestream.h"
35 #include "get_bits.h"
36 #include "idctdsp.h"
37 #include "internal.h"
38 #include "jpegtables.h"
39 #include "mjpeg.h"
40
41 enum ChunkType {
42 DISPLAY_INFO = 0xC8,
43 TILE_DATA,
44 CURSOR_POS,
45 CURSOR_SHAPE,
46 CHUNK_CC,
47 CHUNK_CD
48 };
49
50 enum Compression {
51 COMPR_EPIC_J_B = 2,
52 COMPR_KEMPF_J_B,
53 };
54
55 static const uint8_t luma_quant[64] = {
56 8, 6, 5, 8, 12, 20, 26, 31,
57 6, 6, 7, 10, 13, 29, 30, 28,
58 7, 7, 8, 12, 20, 29, 35, 28,
59 7, 9, 11, 15, 26, 44, 40, 31,
60 9, 11, 19, 28, 34, 55, 52, 39,
61 12, 18, 28, 32, 41, 52, 57, 46,
62 25, 32, 39, 44, 52, 61, 60, 51,
63 36, 46, 48, 49, 56, 50, 52, 50
64 };
65
66 static const uint8_t chroma_quant[64] = {
67 9, 9, 12, 24, 50, 50, 50, 50,
68 9, 11, 13, 33, 50, 50, 50, 50,
69 12, 13, 28, 50, 50, 50, 50, 50,
70 24, 33, 50, 50, 50, 50, 50, 50,
71 50, 50, 50, 50, 50, 50, 50, 50,
72 50, 50, 50, 50, 50, 50, 50, 50,
73 50, 50, 50, 50, 50, 50, 50, 50,
74 50, 50, 50, 50, 50, 50, 50, 50,
75 };
76
77 typedef struct JPGContext {
78 BlockDSPContext bdsp;
79 IDCTDSPContext idsp;
80 ScanTable scantable;
81
82 VLC dc_vlc[2], ac_vlc[2];
83 int prev_dc[3];
84 DECLARE_ALIGNED(16, int16_t, block)[6][64];
85
86 uint8_t *buf;
87 } JPGContext;
88
89 typedef struct G2MContext {
90 JPGContext jc;
91 int version;
92
93 int compression;
94 int width, height, bpp;
95 int orig_width, orig_height;
96 int tile_width, tile_height;
97 int tiles_x, tiles_y, tile_x, tile_y;
98
99 int got_header;
100
101 uint8_t *framebuf;
102 int framebuf_stride, old_width, old_height;
103
104 uint8_t *synth_tile, *jpeg_tile;
105 int tile_stride, old_tile_w, old_tile_h;
106
107 uint8_t *kempf_buf, *kempf_flags;
108
109 uint8_t *cursor;
110 int cursor_stride;
111 int cursor_fmt;
112 int cursor_w, cursor_h, cursor_x, cursor_y;
113 int cursor_hot_x, cursor_hot_y;
114 } G2MContext;
115
116 static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
117 const uint8_t *val_table, int nb_codes,
118 int is_ac)
119 {
120 uint8_t huff_size[256] = { 0 };
121 uint16_t huff_code[256];
122 uint16_t huff_sym[256];
123 int i;
124
125 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
126
127 for (i = 0; i < 256; i++)
128 huff_sym[i] = i + 16 * is_ac;
129
130 if (is_ac)
131 huff_sym[0] = 16 * 256;
132
133 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
134 huff_code, 2, 2, huff_sym, 2, 2, 0);
135 }
136
137 static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
138 {
139 int ret;
140
141 ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
142 avpriv_mjpeg_val_dc, 12, 0);
143 if (ret)
144 return ret;
145 ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
146 avpriv_mjpeg_val_dc, 12, 0);
147 if (ret)
148 return ret;
149 ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
150 avpriv_mjpeg_val_ac_luminance, 251, 1);
151 if (ret)
152 return ret;
153 ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
154 avpriv_mjpeg_val_ac_chrominance, 251, 1);
155 if (ret)
156 return ret;
157
158 ff_blockdsp_init(&c->bdsp, avctx);
159 ff_idctdsp_init(&c->idsp, avctx);
160 ff_init_scantable(c->idsp.idct_permutation, &c->scantable,
161 ff_zigzag_direct);
162
163 return 0;
164 }
165
166 static av_cold void jpg_free_context(JPGContext *ctx)
167 {
168 int i;
169
170 for (i = 0; i < 2; i++) {
171 ff_free_vlc(&ctx->dc_vlc[i]);
172 ff_free_vlc(&ctx->ac_vlc[i]);
173 }
174
175 av_freep(&ctx->buf);
176 }
177
178 static void jpg_unescape(const uint8_t *src, int src_size,
179 uint8_t *dst, int *dst_size)
180 {
181 const uint8_t *src_end = src + src_size;
182 uint8_t *dst_start = dst;
183
184 while (src < src_end) {
185 uint8_t x = *src++;
186
187 *dst++ = x;
188
189 if (x == 0xFF && !*src)
190 src++;
191 }
192 *dst_size = dst - dst_start;
193 }
194
195 static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
196 int plane, int16_t *block)
197 {
198 int dc, val, pos;
199 const int is_chroma = !!plane;
200 const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
201
202 c->bdsp.clear_block(block);
203 dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
204 if (dc < 0)
205 return AVERROR_INVALIDDATA;
206 if (dc)
207 dc = get_xbits(gb, dc);
208 dc = dc * qmat[0] + c->prev_dc[plane];
209 block[0] = dc;
210 c->prev_dc[plane] = dc;
211
212 pos = 0;
213 while (pos < 63) {
214 val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3);
215 if (val < 0)
216 return AVERROR_INVALIDDATA;
217 pos += val >> 4;
218 val &= 0xF;
219 if (pos > 63)
220 return val ? AVERROR_INVALIDDATA : 0;
221 if (val) {
222 int nbits = val;
223
224 val = get_xbits(gb, nbits);
225 val *= qmat[ff_zigzag_direct[pos]];
226 block[c->scantable.permutated[pos]] = val;
227 }
228 }
229 return 0;
230 }
231
232 static inline void yuv2rgb(uint8_t *out, int Y, int U, int V)
233 {
234 out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
235 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
236 out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
237 }
238
239 static int jpg_decode_data(JPGContext *c, int width, int height,
240 const uint8_t *src, int src_size,
241 uint8_t *dst, int dst_stride,
242 const uint8_t *mask, int mask_stride, int num_mbs,
243 int swapuv)
244 {
245 GetBitContext gb;
246 int mb_w, mb_h, mb_x, mb_y, i, j;
247 int bx, by;
248 int unesc_size;
249 int ret;
250
251 if ((ret = av_reallocp(&c->buf,
252 src_size + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
253 return ret;
254 jpg_unescape(src, src_size, c->buf, &unesc_size);
255 memset(c->buf + unesc_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
256 init_get_bits(&gb, c->buf, unesc_size * 8);
257
258 width = FFALIGN(width, 16);
259 mb_w = width >> 4;
260 mb_h = (height + 15) >> 4;
261
262 if (!num_mbs)
263 num_mbs = mb_w * mb_h * 4;
264
265 for (i = 0; i < 3; i++)
266 c->prev_dc[i] = 1024;
267 bx =
268 by = 0;
269 c->bdsp.clear_blocks(c->block[0]);
270 for (mb_y = 0; mb_y < mb_h; mb_y++) {
271 for (mb_x = 0; mb_x < mb_w; mb_x++) {
272 if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
273 !mask[mb_x * 2 + mask_stride] &&
274 !mask[mb_x * 2 + 1 + mask_stride]) {
275 bx += 16;
276 continue;
277 }
278 for (j = 0; j < 2; j++) {
279 for (i = 0; i < 2; i++) {
280 if (mask && !mask[mb_x * 2 + i + j * mask_stride])
281 continue;
282 num_mbs--;
283 if ((ret = jpg_decode_block(c, &gb, 0,
284 c->block[i + j * 2])) != 0)
285 return ret;
286 c->idsp.idct(c->block[i + j * 2]);
287 }
288 }
289 for (i = 1; i < 3; i++) {
290 if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
291 return ret;
292 c->idsp.idct(c->block[i + 3]);
293 }
294
295 for (j = 0; j < 16; j++) {
296 uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
297 for (i = 0; i < 16; i++) {
298 int Y, U, V;
299
300 Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
301 U = c->block[4 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
302 V = c->block[5 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128;
303 yuv2rgb(out + i * 3, Y, U, V);
304 }
305 }
306
307 if (!num_mbs)
308 return 0;
309 bx += 16;
310 }
311 bx = 0;
312 by += 16;
313 if (mask)
314 mask += mask_stride * 2;
315 }
316
317 return 0;
318 }
319
320 static void kempf_restore_buf(const uint8_t *src, int len,
321 uint8_t *dst, int stride,
322 const uint8_t *jpeg_tile, int tile_stride,
323 int width, int height,
324 const uint8_t *pal, int npal, int tidx)
325 {
326 GetBitContext gb;
327 int i, j, nb, col;
328
329 init_get_bits(&gb, src, len * 8);
330
331 if (npal <= 2) nb = 1;
332 else if (npal <= 4) nb = 2;
333 else if (npal <= 16) nb = 4;
334 else nb = 8;
335
336 for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
337 if (get_bits(&gb, 8))
338 continue;
339 for (i = 0; i < width; i++) {
340 col = get_bits(&gb, nb);
341 if (col != tidx)
342 memcpy(dst + i * 3, pal + col * 3, 3);
343 else
344 memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
345 }
346 }
347 }
348
349 static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
350 const uint8_t *src, int src_size)
351 {
352 int width, height;
353 int hdr, zsize, npal, tidx = -1, ret;
354 int i, j;
355 const uint8_t *src_end = src + src_size;
356 uint8_t pal[768], transp[3];
357 uLongf dlen = (c->tile_width + 1) * c->tile_height;
358 int sub_type;
359 int nblocks, cblocks, bstride;
360 int bits, bitbuf, coded;
361 uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
362 tile_y * c->tile_height * c->framebuf_stride;
363
364 if (src_size < 2)
365 return AVERROR_INVALIDDATA;
366
367 width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
368 height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
369
370 hdr = *src++;
371 sub_type = hdr >> 5;
372 if (sub_type == 0) {
373 int j;
374 memcpy(transp, src, 3);
375 src += 3;
376 for (j = 0; j < height; j++, dst += c->framebuf_stride)
377 for (i = 0; i < width; i++)
378 memcpy(dst + i * 3, transp, 3);
379 return 0;
380 } else if (sub_type == 1) {
381 return jpg_decode_data(&c->jc, width, height, src, src_end - src,
382 dst, c->framebuf_stride, NULL, 0, 0, 0);
383 }
384
385 if (sub_type != 2) {
386 memcpy(transp, src, 3);
387 src += 3;
388 }
389 npal = *src++ + 1;
390 memcpy(pal, src, npal * 3);
391 src += npal * 3;
392 if (sub_type != 2) {
393 for (i = 0; i < npal; i++) {
394 if (!memcmp(pal + i * 3, transp, 3)) {
395 tidx = i;
396 break;
397 }
398 }
399 }
400
401 if (src_end - src < 2)
402 return 0;
403 zsize = (src[0] << 8) | src[1];
404 src += 2;
405
406 if (src_end - src < zsize)
407 return AVERROR_INVALIDDATA;
408
409 ret = uncompress(c->kempf_buf, &dlen, src, zsize);
410 if (ret)
411 return AVERROR_INVALIDDATA;
412 src += zsize;
413
414 if (sub_type == 2) {
415 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
416 NULL, 0, width, height, pal, npal, tidx);
417 return 0;
418 }
419
420 nblocks = *src++ + 1;
421 cblocks = 0;
422 bstride = FFALIGN(width, 16) >> 3;
423 // blocks are coded LSB and we need normal bitreader for JPEG data
424 bits = 0;
425 for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
426 for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
427 if (!bits) {
428 bitbuf = *src++;
429 bits = 8;
430 }
431 coded = bitbuf & 1;
432 bits--;
433 bitbuf >>= 1;
434 cblocks += coded;
435 if (cblocks > nblocks)
436 return AVERROR_INVALIDDATA;
437 c->kempf_flags[j * 2 + i * 2 * bstride] =
438 c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
439 c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
440 c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
441 }
442 }
443
444 memset(c->jpeg_tile, 0, c->tile_stride * height);
445 jpg_decode_data(&c->jc, width, height, src, src_end - src,
446 c->jpeg_tile, c->tile_stride,
447 c->kempf_flags, bstride, nblocks * 4, 0);
448
449 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
450 c->jpeg_tile, c->tile_stride,
451 width, height, pal, npal, tidx);
452
453 return 0;
454 }
455
456 static int g2m_init_buffers(G2MContext *c)
457 {
458 int aligned_height;
459
460 if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
461 c->framebuf_stride = FFALIGN(c->width * 3, 16);
462 aligned_height = FFALIGN(c->height, 16);
463 av_free(c->framebuf);
464 c->framebuf = av_mallocz(c->framebuf_stride * aligned_height);
465 if (!c->framebuf)
466 return AVERROR(ENOMEM);
467 }
468 if (!c->synth_tile || !c->jpeg_tile ||
469 c->old_tile_w < c->tile_width ||
470 c->old_tile_h < c->tile_height) {
471 c->tile_stride = FFALIGN(c->tile_width * 3, 16);
472 aligned_height = FFALIGN(c->tile_height, 16);
473 av_free(c->synth_tile);
474 av_free(c->jpeg_tile);
475 av_free(c->kempf_buf);
476 av_free(c->kempf_flags);
477 c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
478 c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
479 c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height
480 + FF_INPUT_BUFFER_PADDING_SIZE);
481 c->kempf_flags = av_mallocz( c->tile_width * aligned_height);
482 if (!c->synth_tile || !c->jpeg_tile ||
483 !c->kempf_buf || !c->kempf_flags)
484 return AVERROR(ENOMEM);
485 }
486
487 return 0;
488 }
489
490 static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
491 GetByteContext *gb)
492 {
493 int i, j, k;
494 uint8_t *dst;
495 uint32_t bits;
496 uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
497 uint32_t cursor_hot_x, cursor_hot_y;
498 int cursor_fmt, err;
499
500 cur_size = bytestream2_get_be32(gb);
501 cursor_w = bytestream2_get_byte(gb);
502 cursor_h = bytestream2_get_byte(gb);
503 cursor_hot_x = bytestream2_get_byte(gb);
504 cursor_hot_y = bytestream2_get_byte(gb);
505 cursor_fmt = bytestream2_get_byte(gb);
506
507 cursor_stride = FFALIGN(cursor_w, 32) * 4;
508
509 if (cursor_w < 1 || cursor_w > 256 ||
510 cursor_h < 1 || cursor_h > 256) {
511 av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n",
512 cursor_w, cursor_h);
513 return AVERROR_INVALIDDATA;
514 }
515 if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
516 av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n",
517 cursor_hot_x, cursor_hot_y);
518 cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
519 cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
520 }
521 if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
522 c->cursor_w * c->cursor_h / 4 > cur_size) {
523 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n",
524 cur_size, bytestream2_get_bytes_left(gb));
525 return AVERROR_INVALIDDATA;
526 }
527 if (cursor_fmt != 1 && cursor_fmt != 32) {
528 avpriv_report_missing_feature(avctx, "Cursor format %d",
529 cursor_fmt);
530 return AVERROR_PATCHWELCOME;
531 }
532
533 if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
534 av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
535 return err;
536 }
537
538 c->cursor_w = cursor_w;
539 c->cursor_h = cursor_h;
540 c->cursor_hot_x = cursor_hot_x;
541 c->cursor_hot_y = cursor_hot_y;
542 c->cursor_fmt = cursor_fmt;
543 c->cursor_stride = cursor_stride;
544
545 dst = c->cursor;
546 switch (c->cursor_fmt) {
547 case 1: // old monochrome
548 for (j = 0; j < c->cursor_h; j++) {
549 for (i = 0; i < c->cursor_w; i += 32) {
550 bits = bytestream2_get_be32(gb);
551 for (k = 0; k < 32; k++) {
552 dst[0] = !!(bits & 0x80000000);
553 dst += 4;
554 bits <<= 1;
555 }
556 }
557 dst += c->cursor_stride - c->cursor_w * 4;
558 }
559
560 dst = c->cursor;
561 for (j = 0; j < c->cursor_h; j++) {
562 for (i = 0; i < c->cursor_w; i += 32) {
563 bits = bytestream2_get_be32(gb);
564 for (k = 0; k < 32; k++) {
565 int mask_bit = !!(bits & 0x80000000);
566 switch (dst[0] * 2 + mask_bit) {
567 case 0:
568 dst[0] = 0xFF;
569 dst[1] = 0x00;
570 dst[2] = 0x00;
571 dst[3] = 0x00;
572 break;
573 case 1:
574 dst[0] = 0xFF;
575 dst[1] = 0xFF;
576 dst[2] = 0xFF;
577 dst[3] = 0xFF;
578 break;
579 default:
580 dst[0] = 0x00;
581 dst[1] = 0x00;
582 dst[2] = 0x00;
583 dst[3] = 0x00;
584 }
585 dst += 4;
586 bits <<= 1;
587 }
588 }
589 dst += c->cursor_stride - c->cursor_w * 4;
590 }
591 break;
592 case 32: // full colour
593 /* skip monochrome version of the cursor and decode RGBA instead */
594 bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
595 for (j = 0; j < c->cursor_h; j++) {
596 for (i = 0; i < c->cursor_w; i++) {
597 int val = bytestream2_get_be32(gb);
598 *dst++ = val >> 0;
599 *dst++ = val >> 8;
600 *dst++ = val >> 16;
601 *dst++ = val >> 24;
602 }
603 dst += c->cursor_stride - c->cursor_w * 4;
604 }
605 break;
606 default:
607 return AVERROR_PATCHWELCOME;
608 }
609 return 0;
610 }
611
612 #define APPLY_ALPHA(src, new, alpha) \
613 src = (src * (256 - alpha) + new * alpha) >> 8
614
615 static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
616 {
617 int i, j;
618 int x, y, w, h;
619 const uint8_t *cursor;
620
621 if (!c->cursor)
622 return;
623
624 x = c->cursor_x - c->cursor_hot_x;
625 y = c->cursor_y - c->cursor_hot_y;
626
627 cursor = c->cursor;
628 w = c->cursor_w;
629 h = c->cursor_h;
630
631 if (x + w > c->width)
632 w = c->width - x;
633 if (y + h > c->height)
634 h = c->height - y;
635 if (x < 0) {
636 w += x;
637 cursor += -x * 4;
638 } else {
639 dst += x * 3;
640 }
641 if (y < 0) {
642 h += y;
643 cursor += -y * c->cursor_stride;
644 } else {
645 dst += y * stride;
646 }
647 if (w < 0 || h < 0)
648 return;
649
650 for (j = 0; j < h; j++) {
651 for (i = 0; i < w; i++) {
652 uint8_t alpha = cursor[i * 4];
653 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
654 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
655 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
656 }
657 dst += stride;
658 cursor += c->cursor_stride;
659 }
660 }
661
662 static int g2m_decode_frame(AVCodecContext *avctx, void *data,
663 int *got_picture_ptr, AVPacket *avpkt)
664 {
665 const uint8_t *buf = avpkt->data;
666 int buf_size = avpkt->size;
667 G2MContext *c = avctx->priv_data;
668 AVFrame *pic = data;
669 GetByteContext bc, tbc;
670 int magic;
671 int got_header = 0;
672 uint32_t chunk_size, r_mask, g_mask, b_mask;
673 int chunk_type, chunk_start;
674 int i;
675 int ret;
676
677 if (buf_size < 12) {
678 av_log(avctx, AV_LOG_ERROR,
679 "Frame should have at least 12 bytes, got %d instead\n",
680 buf_size);
681 return AVERROR_INVALIDDATA;
682 }
683
684 bytestream2_init(&bc, buf, buf_size);
685
686 magic = bytestream2_get_be32(&bc);
687 if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
688 (magic & 0xF) < 2 || (magic & 0xF) > 4) {
689 av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
690 return AVERROR_INVALIDDATA;
691 }
692
693 if ((magic & 0xF) != 4) {
694 av_log(avctx, AV_LOG_ERROR, "G2M2 and G2M3 are not yet supported\n");
695 return AVERROR(ENOSYS);
696 }
697
698 while (bytestream2_get_bytes_left(&bc) > 5) {
699 chunk_size = bytestream2_get_le32(&bc) - 1;
700 chunk_type = bytestream2_get_byte(&bc);
701 chunk_start = bytestream2_tell(&bc);
702 if (chunk_size > bytestream2_get_bytes_left(&bc)) {
703 av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n",
704 chunk_size, chunk_type);
705 break;
706 }
707 switch (chunk_type) {
708 case DISPLAY_INFO:
709 c->got_header = 0;
710 if (chunk_size < 21) {
711 av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n",
712 chunk_size);
713 break;
714 }
715 c->width = bytestream2_get_be32(&bc);
716 c->height = bytestream2_get_be32(&bc);
717 if (c->width < 16 || c->width > c->orig_width ||
718 c->height < 16 || c->height > c->orig_height) {
719 av_log(avctx, AV_LOG_ERROR,
720 "Invalid frame dimensions %dx%d\n",
721 c->width, c->height);
722 ret = AVERROR_INVALIDDATA;
723 goto header_fail;
724 }
725 if (c->width != avctx->width || c->height != avctx->height) {
726 ret = ff_set_dimensions(avctx, c->width, c->height);
727 if (ret < 0)
728 return ret;
729 }
730 c->compression = bytestream2_get_be32(&bc);
731 if (c->compression != 2 && c->compression != 3) {
732 av_log(avctx, AV_LOG_ERROR,
733 "Unknown compression method %d\n",
734 c->compression);
735 return AVERROR_PATCHWELCOME;
736 }
737 c->tile_width = bytestream2_get_be32(&bc);
738 c->tile_height = bytestream2_get_be32(&bc);
739 if (!c->tile_width || !c->tile_height ||
740 ((c->tile_width | c->tile_height) & 0xF)) {
741 av_log(avctx, AV_LOG_ERROR,
742 "Invalid tile dimensions %dx%d\n",
743 c->tile_width, c->tile_height);
744 ret = AVERROR_INVALIDDATA;
745 goto header_fail;
746 }
747 c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
748 c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
749 c->bpp = bytestream2_get_byte(&bc);
750 if (c->bpp == 32) {
751 if (bytestream2_get_bytes_left(&bc) < 16 ||
752 (chunk_size - 21) < 16) {
753 av_log(avctx, AV_LOG_ERROR,
754 "Display info: missing bitmasks!\n");
755 return AVERROR_INVALIDDATA;
756 }
757 r_mask = bytestream2_get_be32(&bc);
758 g_mask = bytestream2_get_be32(&bc);
759 b_mask = bytestream2_get_be32(&bc);
760 if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
761 av_log(avctx, AV_LOG_ERROR,
762 "Invalid or unsupported bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32"\n",
763 r_mask, g_mask, b_mask);
764 return AVERROR_PATCHWELCOME;
765 }
766 } else {
767 avpriv_request_sample(avctx, "bpp=%d", c->bpp);
768 return AVERROR_PATCHWELCOME;
769 }
770 if (g2m_init_buffers(c)) {
771 ret = AVERROR(ENOMEM);
772 goto header_fail;
773 }
774 got_header = 1;
775 break;
776 case TILE_DATA:
777 if (!c->tiles_x || !c->tiles_y) {
778 av_log(avctx, AV_LOG_WARNING,
779 "No display info - skipping tile\n");
780 break;
781 }
782 if (chunk_size < 2) {
783 av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n",
784 chunk_size);
785 break;
786 }
787 c->tile_x = bytestream2_get_byte(&bc);
788 c->tile_y = bytestream2_get_byte(&bc);
789 if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
790 av_log(avctx, AV_LOG_ERROR,
791 "Invalid tile pos %d,%d (in %dx%d grid)\n",
792 c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
793 break;
794 }
795 ret = 0;
796 switch (c->compression) {
797 case COMPR_EPIC_J_B:
798 av_log(avctx, AV_LOG_ERROR,
799 "ePIC j-b compression is not implemented yet\n");
800 return AVERROR(ENOSYS);
801 case COMPR_KEMPF_J_B:
802 ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
803 buf + bytestream2_tell(&bc),
804 chunk_size - 2);
805 break;
806 }
807 if (ret && c->framebuf)
808 av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
809 c->tile_x, c->tile_y);
810 break;
811 case CURSOR_POS:
812 if (chunk_size < 5) {
813 av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
814 chunk_size);
815 break;
816 }
817 c->cursor_x = bytestream2_get_be16(&bc);
818 c->cursor_y = bytestream2_get_be16(&bc);
819 break;
820 case CURSOR_SHAPE:
821 if (chunk_size < 8) {
822 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
823 chunk_size);
824 break;
825 }
826 bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
827 chunk_size - 4);
828 g2m_load_cursor(avctx, c, &tbc);
829 break;
830 case CHUNK_CC:
831 case CHUNK_CD:
832 break;
833 default:
834 av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n",
835 chunk_type);
836 }
837
838 /* navigate to next chunk */
839 bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
840 }
841 if (got_header)
842 c->got_header = 1;
843
844 if (c->width && c->height) {
845 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) {
846 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
847 return ret;
848 }
849
850 pic->key_frame = got_header;
851 pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
852
853 for (i = 0; i < avctx->height; i++)
854 memcpy(pic->data[0] + i * pic->linesize[0],
855 c->framebuf + i * c->framebuf_stride,
856 c->width * 3);
857 g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
858
859 *got_picture_ptr = 1;
860 }
861
862 return buf_size;
863
864 header_fail:
865 c->width =
866 c->height = 0;
867 c->tiles_x =
868 c->tiles_y = 0;
869 return ret;
870 }
871
872 static av_cold int g2m_decode_init(AVCodecContext *avctx)
873 {
874 G2MContext *const c = avctx->priv_data;
875 int ret;
876
877 if ((ret = jpg_init(avctx, &c->jc)) != 0) {
878 av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
879 jpg_free_context(&c->jc);
880 return AVERROR(ENOMEM);
881 }
882
883 avctx->pix_fmt = AV_PIX_FMT_RGB24;
884
885 // store original sizes and check against those if resize happens
886 c->orig_width = avctx->width;
887 c->orig_height = avctx->height;
888
889 return 0;
890 }
891
892 static av_cold int g2m_decode_end(AVCodecContext *avctx)
893 {
894 G2MContext *const c = avctx->priv_data;
895
896 jpg_free_context(&c->jc);
897
898 av_freep(&c->kempf_buf);
899 av_freep(&c->kempf_flags);
900 av_freep(&c->synth_tile);
901 av_freep(&c->jpeg_tile);
902 av_freep(&c->cursor);
903 av_freep(&c->framebuf);
904
905 return 0;
906 }
907
908 AVCodec ff_g2m_decoder = {
909 .name = "g2m",
910 .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
911 .type = AVMEDIA_TYPE_VIDEO,
912 .id = AV_CODEC_ID_G2M,
913 .priv_data_size = sizeof(G2MContext),
914 .init = g2m_decode_init,
915 .close = g2m_decode_end,
916 .decode = g2m_decode_frame,
917 .capabilities = CODEC_CAP_DR1,
918 };