1/* 2 * PGS subtitle decoder 3 * Copyright (c) 2009 Stephen Backway 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 * PGS subtitle decoder 25 */ 26 27#include "avcodec.h" 28#include "bytestream.h" 29#include "internal.h" 30#include "mathops.h" 31 32#include "libavutil/colorspace.h" 33#include "libavutil/imgutils.h" 34#include "libavutil/opt.h" 35 36#define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b)) 37#define MAX_EPOCH_PALETTES 8 // Max 8 allowed per PGS epoch 38#define MAX_EPOCH_OBJECTS 64 // Max 64 allowed per PGS epoch 39#define MAX_OBJECT_REFS 2 // Max objects per display set 40 41enum SegmentType { 42 PALETTE_SEGMENT = 0x14, 43 OBJECT_SEGMENT = 0x15, 44 PRESENTATION_SEGMENT = 0x16, 45 WINDOW_SEGMENT = 0x17, 46 DISPLAY_SEGMENT = 0x80, 47}; 48 49typedef struct PGSSubObjectRef { 50 int id; 51 int window_id; 52 uint8_t composition_flag; 53 int x; 54 int y; 55 int crop_x; 56 int crop_y; 57 int crop_w; 58 int crop_h; 59} PGSSubObjectRef; 60 61typedef struct PGSSubPresentation { 62 int id_number; 63 int palette_id; 64 int object_count; 65 PGSSubObjectRef objects[MAX_OBJECT_REFS]; 66 int64_t pts; 67} PGSSubPresentation; 68 69typedef struct PGSSubObject { 70 int id; 71 int w; 72 int h; 73 uint8_t *rle; 74 unsigned int rle_buffer_size, rle_data_len; 75 unsigned int rle_remaining_len; 76} PGSSubObject; 77 78typedef struct PGSSubObjects { 79 int count; 80 PGSSubObject object[MAX_EPOCH_OBJECTS]; 81} PGSSubObjects; 82 83typedef struct PGSSubPalette { 84 int id; 85 uint32_t clut[256]; 86} PGSSubPalette; 87 88typedef struct PGSSubPalettes { 89 int count; 90 PGSSubPalette palette[MAX_EPOCH_PALETTES]; 91} PGSSubPalettes; 92 93typedef struct PGSSubContext { 94 AVClass *class; 95 PGSSubPresentation presentation; 96 PGSSubPalettes palettes; 97 PGSSubObjects objects; 98 int forced_subs_only; 99} PGSSubContext; 100 101static void flush_cache(AVCodecContext *avctx) 102{ 103 PGSSubContext *ctx = avctx->priv_data; 104 int i; 105 106 for (i = 0; i < ctx->objects.count; i++) { 107 av_freep(&ctx->objects.object[i].rle); 108 ctx->objects.object[i].rle_buffer_size = 0; 109 ctx->objects.object[i].rle_remaining_len = 0; 110 } 111 ctx->objects.count = 0; 112 ctx->palettes.count = 0; 113} 114 115static PGSSubObject * find_object(int id, PGSSubObjects *objects) 116{ 117 int i; 118 119 for (i = 0; i < objects->count; i++) { 120 if (objects->object[i].id == id) 121 return &objects->object[i]; 122 } 123 return NULL; 124} 125 126static PGSSubPalette * find_palette(int id, PGSSubPalettes *palettes) 127{ 128 int i; 129 130 for (i = 0; i < palettes->count; i++) { 131 if (palettes->palette[i].id == id) 132 return &palettes->palette[i]; 133 } 134 return NULL; 135} 136 137static av_cold int init_decoder(AVCodecContext *avctx) 138{ 139 avctx->pix_fmt = AV_PIX_FMT_PAL8; 140 141 return 0; 142} 143 144static av_cold int close_decoder(AVCodecContext *avctx) 145{ 146 flush_cache(avctx); 147 148 return 0; 149} 150 151/** 152 * Decode the RLE data. 153 * 154 * The subtitle is stored as a Run Length Encoded image. 155 * 156 * @param avctx contains the current codec context 157 * @param sub pointer to the processed subtitle data 158 * @param buf pointer to the RLE data to process 159 * @param buf_size size of the RLE data to process 160 */ 161static int decode_rle(AVCodecContext *avctx, AVSubtitleRect *rect, 162 const uint8_t *buf, unsigned int buf_size) 163{ 164 const uint8_t *rle_bitmap_end; 165 int pixel_count, line_count; 166 167 rle_bitmap_end = buf + buf_size; 168 169 rect->pict.data[0] = av_malloc(rect->w * rect->h); 170 171 if (!rect->pict.data[0]) 172 return AVERROR(ENOMEM); 173 174 pixel_count = 0; 175 line_count = 0; 176 177 while (buf < rle_bitmap_end && line_count < rect->h) { 178 uint8_t flags, color; 179 int run; 180 181 color = bytestream_get_byte(&buf); 182 run = 1; 183 184 if (color == 0x00) { 185 flags = bytestream_get_byte(&buf); 186 run = flags & 0x3f; 187 if (flags & 0x40) 188 run = (run << 8) + bytestream_get_byte(&buf); 189 color = flags & 0x80 ? bytestream_get_byte(&buf) : 0; 190 } 191 192 if (run > 0 && pixel_count + run <= rect->w * rect->h) { 193 memset(rect->pict.data[0] + pixel_count, color, run); 194 pixel_count += run; 195 } else if (!run) { 196 /* 197 * New Line. Check if correct pixels decoded, if not display warning 198 * and adjust bitmap pointer to correct new line position. 199 */ 200 if (pixel_count % rect->w > 0) { 201 av_log(avctx, AV_LOG_ERROR, "Decoded %d pixels, when line should be %d pixels\n", 202 pixel_count % rect->w, rect->w); 203 if (avctx->err_recognition & AV_EF_EXPLODE) { 204 return AVERROR_INVALIDDATA; 205 } 206 } 207 line_count++; 208 } 209 } 210 211 if (pixel_count < rect->w * rect->h) { 212 av_log(avctx, AV_LOG_ERROR, "Insufficient RLE data for subtitle\n"); 213 return AVERROR_INVALIDDATA; 214 } 215 216 av_dlog(avctx, "Pixel Count = %d, Area = %d\n", pixel_count, rect->w * rect->h); 217 218 return 0; 219} 220 221/** 222 * Parse the picture segment packet. 223 * 224 * The picture segment contains details on the sequence id, 225 * width, height and Run Length Encoded (RLE) bitmap data. 226 * 227 * @param avctx contains the current codec context 228 * @param buf pointer to the packet to process 229 * @param buf_size size of packet to process 230 */ 231static int parse_object_segment(AVCodecContext *avctx, 232 const uint8_t *buf, int buf_size) 233{ 234 PGSSubContext *ctx = avctx->priv_data; 235 PGSSubObject *object; 236 237 uint8_t sequence_desc; 238 unsigned int rle_bitmap_len, width, height; 239 int id; 240 241 if (buf_size <= 4) 242 return AVERROR_INVALIDDATA; 243 buf_size -= 4; 244 245 id = bytestream_get_be16(&buf); 246 object = find_object(id, &ctx->objects); 247 if (!object) { 248 if (ctx->objects.count >= MAX_EPOCH_OBJECTS) { 249 av_log(avctx, AV_LOG_ERROR, "Too many objects in epoch\n"); 250 return AVERROR_INVALIDDATA; 251 } 252 object = &ctx->objects.object[ctx->objects.count++]; 253 object->id = id; 254 } 255 256 /* skip object version number */ 257 buf += 1; 258 259 /* Read the Sequence Description to determine if start of RLE data or appended to previous RLE */ 260 sequence_desc = bytestream_get_byte(&buf); 261 262 if (!(sequence_desc & 0x80)) { 263 /* Additional RLE data */ 264 if (buf_size > object->rle_remaining_len) 265 return AVERROR_INVALIDDATA; 266 267 memcpy(object->rle + object->rle_data_len, buf, buf_size); 268 object->rle_data_len += buf_size; 269 object->rle_remaining_len -= buf_size; 270 271 return 0; 272 } 273 274 if (buf_size <= 7) 275 return AVERROR_INVALIDDATA; 276 buf_size -= 7; 277 278 /* Decode rle bitmap length, stored size includes width/height data */ 279 rle_bitmap_len = bytestream_get_be24(&buf) - 2*2; 280 281 /* Get bitmap dimensions from data */ 282 width = bytestream_get_be16(&buf); 283 height = bytestream_get_be16(&buf); 284 285 /* Make sure the bitmap is not too large */ 286 if (avctx->width < width || avctx->height < height) { 287 av_log(avctx, AV_LOG_ERROR, "Bitmap dimensions larger than video.\n"); 288 return AVERROR_INVALIDDATA; 289 } 290 291 if (buf_size > rle_bitmap_len) { 292 av_log(avctx, AV_LOG_ERROR, "too much RLE data\n"); 293 return AVERROR_INVALIDDATA; 294 } 295 296 object->w = width; 297 object->h = height; 298 299 av_fast_padded_malloc(&object->rle, &object->rle_buffer_size, rle_bitmap_len); 300 301 if (!object->rle) 302 return AVERROR(ENOMEM); 303 304 memcpy(object->rle, buf, buf_size); 305 object->rle_data_len = buf_size; 306 object->rle_remaining_len = rle_bitmap_len - buf_size; 307 308 return 0; 309} 310 311/** 312 * Parse the palette segment packet. 313 * 314 * The palette segment contains details of the palette, 315 * a maximum of 256 colors can be defined. 316 * 317 * @param avctx contains the current codec context 318 * @param buf pointer to the packet to process 319 * @param buf_size size of packet to process 320 */ 321static int parse_palette_segment(AVCodecContext *avctx, 322 const uint8_t *buf, int buf_size) 323{ 324 PGSSubContext *ctx = avctx->priv_data; 325 PGSSubPalette *palette; 326 327 const uint8_t *buf_end = buf + buf_size; 328 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP; 329 int color_id; 330 int y, cb, cr, alpha; 331 int r, g, b, r_add, g_add, b_add; 332 int id; 333 334 id = bytestream_get_byte(&buf); 335 palette = find_palette(id, &ctx->palettes); 336 if (!palette) { 337 if (ctx->palettes.count >= MAX_EPOCH_PALETTES) { 338 av_log(avctx, AV_LOG_ERROR, "Too many palettes in epoch\n"); 339 return AVERROR_INVALIDDATA; 340 } 341 palette = &ctx->palettes.palette[ctx->palettes.count++]; 342 palette->id = id; 343 } 344 345 /* Skip palette version */ 346 buf += 1; 347 348 while (buf < buf_end) { 349 color_id = bytestream_get_byte(&buf); 350 y = bytestream_get_byte(&buf); 351 cr = bytestream_get_byte(&buf); 352 cb = bytestream_get_byte(&buf); 353 alpha = bytestream_get_byte(&buf); 354 355 YUV_TO_RGB1(cb, cr); 356 YUV_TO_RGB2(r, g, b, y); 357 358 av_dlog(avctx, "Color %d := (%d,%d,%d,%d)\n", color_id, r, g, b, alpha); 359 360 /* Store color in palette */ 361 palette->clut[color_id] = RGBA(r,g,b,alpha); 362 } 363 return 0; 364} 365 366/** 367 * Parse the presentation segment packet. 368 * 369 * The presentation segment contains details on the video 370 * width, video height, x & y subtitle position. 371 * 372 * @param avctx contains the current codec context 373 * @param buf pointer to the packet to process 374 * @param buf_size size of packet to process 375 * @todo TODO: Implement cropping 376 */ 377static int parse_presentation_segment(AVCodecContext *avctx, 378 const uint8_t *buf, int buf_size, 379 int64_t pts) 380{ 381 PGSSubContext *ctx = avctx->priv_data; 382 int i, state, ret; 383 const uint8_t *buf_end = buf + buf_size; 384 385 // Video descriptor 386 int w = bytestream_get_be16(&buf); 387 int h = bytestream_get_be16(&buf); 388 389 ctx->presentation.pts = pts; 390 391 av_dlog(avctx, "Video Dimensions %dx%d\n", 392 w, h); 393 ret = ff_set_dimensions(avctx, w, h); 394 if (ret < 0) 395 return ret; 396 397 /* Skip 1 bytes of unknown, frame rate */ 398 buf++; 399 400 // Composition descriptor 401 ctx->presentation.id_number = bytestream_get_be16(&buf); 402 /* 403 * state is a 2 bit field that defines pgs epoch boundaries 404 * 00 - Normal, previously defined objects and palettes are still valid 405 * 01 - Acquisition point, previous objects and palettes can be released 406 * 10 - Epoch start, previous objects and palettes can be released 407 * 11 - Epoch continue, previous objects and palettes can be released 408 * 409 * reserved 6 bits discarded 410 */ 411 state = bytestream_get_byte(&buf) >> 6; 412 if (state != 0) { 413 flush_cache(avctx); 414 } 415 416 /* 417 * skip palette_update_flag (0x80), 418 */ 419 buf += 1; 420 ctx->presentation.palette_id = bytestream_get_byte(&buf); 421 ctx->presentation.object_count = bytestream_get_byte(&buf); 422 if (ctx->presentation.object_count > MAX_OBJECT_REFS) { 423 av_log(avctx, AV_LOG_ERROR, 424 "Invalid number of presentation objects %d\n", 425 ctx->presentation.object_count); 426 ctx->presentation.object_count = 2; 427 if (avctx->err_recognition & AV_EF_EXPLODE) { 428 return AVERROR_INVALIDDATA; 429 } 430 } 431 432 433 for (i = 0; i < ctx->presentation.object_count; i++) 434 { 435 436 if (buf_end - buf < 8) { 437 av_log(avctx, AV_LOG_ERROR, "Insufficent space for object\n"); 438 ctx->presentation.object_count = i; 439 return AVERROR_INVALIDDATA; 440 } 441 442 ctx->presentation.objects[i].id = bytestream_get_be16(&buf); 443 ctx->presentation.objects[i].window_id = bytestream_get_byte(&buf); 444 ctx->presentation.objects[i].composition_flag = bytestream_get_byte(&buf); 445 446 ctx->presentation.objects[i].x = bytestream_get_be16(&buf); 447 ctx->presentation.objects[i].y = bytestream_get_be16(&buf); 448 449 // If cropping 450 if (ctx->presentation.objects[i].composition_flag & 0x80) { 451 ctx->presentation.objects[i].crop_x = bytestream_get_be16(&buf); 452 ctx->presentation.objects[i].crop_y = bytestream_get_be16(&buf); 453 ctx->presentation.objects[i].crop_w = bytestream_get_be16(&buf); 454 ctx->presentation.objects[i].crop_h = bytestream_get_be16(&buf); 455 } 456 457 av_dlog(avctx, "Subtitle Placement x=%d, y=%d\n", 458 ctx->presentation.objects[i].x, ctx->presentation.objects[i].y); 459 460 if (ctx->presentation.objects[i].x > avctx->width || 461 ctx->presentation.objects[i].y > avctx->height) { 462 av_log(avctx, AV_LOG_ERROR, "Subtitle out of video bounds. x = %d, y = %d, video width = %d, video height = %d.\n", 463 ctx->presentation.objects[i].x, 464 ctx->presentation.objects[i].y, 465 avctx->width, avctx->height); 466 ctx->presentation.objects[i].x = 0; 467 ctx->presentation.objects[i].y = 0; 468 if (avctx->err_recognition & AV_EF_EXPLODE) { 469 return AVERROR_INVALIDDATA; 470 } 471 } 472 } 473 474 return 0; 475} 476 477/** 478 * Parse the display segment packet. 479 * 480 * The display segment controls the updating of the display. 481 * 482 * @param avctx contains the current codec context 483 * @param data pointer to the data pertaining the subtitle to display 484 * @param buf pointer to the packet to process 485 * @param buf_size size of packet to process 486 */ 487static int display_end_segment(AVCodecContext *avctx, void *data, 488 const uint8_t *buf, int buf_size) 489{ 490 AVSubtitle *sub = data; 491 PGSSubContext *ctx = avctx->priv_data; 492 int64_t pts; 493 PGSSubPalette *palette; 494 int i, ret; 495 496 pts = ctx->presentation.pts != AV_NOPTS_VALUE ? ctx->presentation.pts : sub->pts; 497 memset(sub, 0, sizeof(*sub)); 498 sub->pts = pts; 499 ctx->presentation.pts = AV_NOPTS_VALUE; 500 sub->start_display_time = 0; 501 // There is no explicit end time for PGS subtitles. The end time 502 // is defined by the start of the next sub which may contain no 503 // objects (i.e. clears the previous sub) 504 sub->end_display_time = UINT32_MAX; 505 sub->format = 0; 506 507 // Blank if last object_count was 0. 508 if (!ctx->presentation.object_count) 509 return 1; 510 sub->rects = av_mallocz(sizeof(*sub->rects) * ctx->presentation.object_count); 511 if (!sub->rects) { 512 return AVERROR(ENOMEM); 513 } 514 palette = find_palette(ctx->presentation.palette_id, &ctx->palettes); 515 if (!palette) { 516 // Missing palette. Should only happen with damaged streams. 517 av_log(avctx, AV_LOG_ERROR, "Invalid palette id %d\n", 518 ctx->presentation.palette_id); 519 avsubtitle_free(sub); 520 return AVERROR_INVALIDDATA; 521 } 522 for (i = 0; i < ctx->presentation.object_count; i++) { 523 PGSSubObject *object; 524 525 sub->rects[i] = av_mallocz(sizeof(*sub->rects[0])); 526 if (!sub->rects[i]) { 527 avsubtitle_free(sub); 528 return AVERROR(ENOMEM); 529 } 530 sub->num_rects++; 531 sub->rects[i]->type = SUBTITLE_BITMAP; 532 533 /* Process bitmap */ 534 object = find_object(ctx->presentation.objects[i].id, &ctx->objects); 535 if (!object) { 536 // Missing object. Should only happen with damaged streams. 537 av_log(avctx, AV_LOG_ERROR, "Invalid object id %d\n", 538 ctx->presentation.objects[i].id); 539 if (avctx->err_recognition & AV_EF_EXPLODE) { 540 avsubtitle_free(sub); 541 return AVERROR_INVALIDDATA; 542 } 543 // Leaves rect empty with 0 width and height. 544 continue; 545 } 546 if (ctx->presentation.objects[i].composition_flag & 0x40) 547 sub->rects[i]->flags |= AV_SUBTITLE_FLAG_FORCED; 548 549 sub->rects[i]->x = ctx->presentation.objects[i].x; 550 sub->rects[i]->y = ctx->presentation.objects[i].y; 551 sub->rects[i]->w = object->w; 552 sub->rects[i]->h = object->h; 553 554 sub->rects[i]->pict.linesize[0] = object->w; 555 556 if (object->rle) { 557 if (object->rle_remaining_len) { 558 av_log(avctx, AV_LOG_ERROR, "RLE data length %u is %u bytes shorter than expected\n", 559 object->rle_data_len, object->rle_remaining_len); 560 if (avctx->err_recognition & AV_EF_EXPLODE) { 561 avsubtitle_free(sub); 562 return AVERROR_INVALIDDATA; 563 } 564 } 565 ret = decode_rle(avctx, sub->rects[i], object->rle, object->rle_data_len); 566 if (ret < 0) { 567 if ((avctx->err_recognition & AV_EF_EXPLODE) || 568 ret == AVERROR(ENOMEM)) { 569 avsubtitle_free(sub); 570 return ret; 571 } 572 sub->rects[i]->w = 0; 573 sub->rects[i]->h = 0; 574 continue; 575 } 576 } 577 /* Allocate memory for colors */ 578 sub->rects[i]->nb_colors = 256; 579 sub->rects[i]->pict.data[1] = av_mallocz(AVPALETTE_SIZE); 580 if (!sub->rects[i]->pict.data[1]) { 581 avsubtitle_free(sub); 582 return AVERROR(ENOMEM); 583 } 584 585 if (!ctx->forced_subs_only || ctx->presentation.objects[i].composition_flag & 0x40) 586 memcpy(sub->rects[i]->pict.data[1], palette->clut, sub->rects[i]->nb_colors * sizeof(uint32_t)); 587 588 } 589 return 1; 590} 591 592static int decode(AVCodecContext *avctx, void *data, int *data_size, 593 AVPacket *avpkt) 594{ 595 const uint8_t *buf = avpkt->data; 596 int buf_size = avpkt->size; 597 598 const uint8_t *buf_end; 599 uint8_t segment_type; 600 int segment_length; 601 int i, ret; 602 603 av_dlog(avctx, "PGS sub packet:\n"); 604 605 for (i = 0; i < buf_size; i++) { 606 av_dlog(avctx, "%02x ", buf[i]); 607 if (i % 16 == 15) 608 av_dlog(avctx, "\n"); 609 } 610 611 if (i & 15) 612 av_dlog(avctx, "\n"); 613 614 *data_size = 0; 615 616 /* Ensure that we have received at a least a segment code and segment length */ 617 if (buf_size < 3) 618 return -1; 619 620 buf_end = buf + buf_size; 621 622 /* Step through buffer to identify segments */ 623 while (buf < buf_end) { 624 segment_type = bytestream_get_byte(&buf); 625 segment_length = bytestream_get_be16(&buf); 626 627 av_dlog(avctx, "Segment Length %d, Segment Type %x\n", segment_length, segment_type); 628 629 if (segment_type != DISPLAY_SEGMENT && segment_length > buf_end - buf) 630 break; 631 632 ret = 0; 633 switch (segment_type) { 634 case PALETTE_SEGMENT: 635 ret = parse_palette_segment(avctx, buf, segment_length); 636 break; 637 case OBJECT_SEGMENT: 638 ret = parse_object_segment(avctx, buf, segment_length); 639 break; 640 case PRESENTATION_SEGMENT: 641 ret = parse_presentation_segment(avctx, buf, segment_length, ((AVSubtitle*)(data))->pts); 642 break; 643 case WINDOW_SEGMENT: 644 /* 645 * Window Segment Structure (No new information provided): 646 * 2 bytes: Unknown, 647 * 2 bytes: X position of subtitle, 648 * 2 bytes: Y position of subtitle, 649 * 2 bytes: Width of subtitle, 650 * 2 bytes: Height of subtitle. 651 */ 652 break; 653 case DISPLAY_SEGMENT: 654 ret = display_end_segment(avctx, data, buf, segment_length); 655 if (ret >= 0) 656 *data_size = ret; 657 break; 658 default: 659 av_log(avctx, AV_LOG_ERROR, "Unknown subtitle segment type 0x%x, length %d\n", 660 segment_type, segment_length); 661 ret = AVERROR_INVALIDDATA; 662 break; 663 } 664 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) 665 return ret; 666 667 buf += segment_length; 668 } 669 670 return buf_size; 671} 672 673#define OFFSET(x) offsetof(PGSSubContext, x) 674#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM 675static const AVOption options[] = { 676 {"forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD}, 677 { NULL }, 678}; 679 680static const AVClass pgsdec_class = { 681 .class_name = "PGS subtitle decoder", 682 .item_name = av_default_item_name, 683 .option = options, 684 .version = LIBAVUTIL_VERSION_INT, 685}; 686 687AVCodec ff_pgssub_decoder = { 688 .name = "pgssub", 689 .long_name = NULL_IF_CONFIG_SMALL("HDMV Presentation Graphic Stream subtitles"), 690 .type = AVMEDIA_TYPE_SUBTITLE, 691 .id = AV_CODEC_ID_HDMV_PGS_SUBTITLE, 692 .priv_data_size = sizeof(PGSSubContext), 693 .init = init_decoder, 694 .close = close_decoder, 695 .decode = decode, 696 .priv_class = &pgsdec_class, 697}; 698