2 * Indeo Video Interactive v4 compatible decoder
3 * Copyright (c) 2009-2011 Maxim Poliakovski
5 * This file is part of Libav.
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.
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.
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
24 * Indeo Video Interactive version 4 decoder
26 * Indeo 4 data is usually transported within .avi or .mov files.
27 * Known FOURCCs: 'IV41'
30 #define BITSTREAM_READER_LE
35 #include "ivi_common.h"
36 #include "indeo4data.h"
38 #define IVI4_STREAM_ANALYSER 0
39 #define IVI4_DEBUG_CHECKSUM 0
42 * Indeo 4 frame types.
46 FRAMETYPE_BIDIR1 = 1, ///< bidirectional frame
47 FRAMETYPE_INTER = 2, ///< non-droppable P-frame
48 FRAMETYPE_BIDIR = 3, ///< bidirectional frame
49 FRAMETYPE_INTER_NOREF = 4, ///< droppable P-frame
50 FRAMETYPE_NULL_FIRST = 5, ///< empty frame with no data
51 FRAMETYPE_NULL_LAST = 6 ///< empty frame with no data
54 #define IVI4_PIC_SIZE_ESC 7
60 RVMapDesc rvmap_tabs[9]; ///< local corrected copy of the static rvmap tables
64 int prev_frame_type; ///< frame type of the previous frame
65 uint32_t data_size; ///< size of the frame data in bytes from picture header
67 int transp_status; ///< transparency mode status: 1 - enabled
69 IVIPicConfig pic_conf;
70 IVIPlaneDesc planes[3]; ///< color planes
72 int buf_switch; ///< used to switch between three buffers
73 int dst_buf; ///< buffer index for the currently decoded frame
74 int ref_buf; ///< inter frame reference buffer index
76 IVIHuffTab mb_vlc; ///< current macroblock table descriptor
77 IVIHuffTab blk_vlc; ///< current block table descriptor
79 uint16_t checksum; ///< frame checksum
83 uint8_t in_q; ///< flag for explicitly stored quantiser delta
84 uint8_t pic_glob_quant;
87 #if IVI4_STREAM_ANALYSER
98 InvTransformPtr *inv_trans;
99 DCTransformPtr *dc_trans;
102 { ff_ivi_inverse_haar_8x8, ff_ivi_dc_haar_2d, 1 },
103 { NULL, NULL, 0 }, /* inverse Haar 8x1 */
104 { NULL, NULL, 0 }, /* inverse Haar 1x8 */
105 { ff_ivi_put_pixels_8x8, ff_ivi_put_dc_pixel_8x8, 1 },
106 { ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d, 1 },
107 { ff_ivi_row_slant8, ff_ivi_dc_row_slant, 1 },
108 { ff_ivi_col_slant8, ff_ivi_dc_col_slant, 1 },
109 { NULL, NULL, 0 }, /* inverse DCT 8x8 */
110 { NULL, NULL, 0 }, /* inverse DCT 8x1 */
111 { NULL, NULL, 0 }, /* inverse DCT 1x8 */
112 { NULL, NULL, 0 }, /* inverse Haar 4x4 */
113 { ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d, 1 },
114 { NULL, NULL, 0 }, /* no transform 4x4 */
115 { NULL, NULL, 0 }, /* inverse Haar 1x4 */
116 { NULL, NULL, 0 }, /* inverse Haar 4x1 */
117 { NULL, NULL, 0 }, /* inverse slant 1x4 */
118 { NULL, NULL, 0 }, /* inverse slant 4x1 */
119 { NULL, NULL, 0 }, /* inverse DCT 4x4 */
123 * Decode subdivision of a plane.
124 * This is a simplified version that checks for two supported subdivisions:
125 * - 1 wavelet band per plane, size factor 1:1, code pattern: 3
126 * - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3
127 * Anything else is either unsupported or corrupt.
129 * @param[in,out] gb the GetBit context
130 * @return number of wavelet bands or 0 on error
132 static int decode_plane_subdivision(GetBitContext *gb)
136 switch (get_bits(gb, 2)) {
140 for (i = 0; i < 4; i++)
141 if (get_bits(gb, 2) != 3)
149 static inline int scale_tile_size(int def_size, int size_factor)
151 return size_factor == 15 ? def_size : (size_factor + 1) << 5;
155 * Decode Indeo 4 picture header.
157 * @param[in,out] ctx pointer to the decoder context
158 * @param[in] avctx pointer to the AVCodecContext
159 * @return result code: 0 = OK, negative number = error
161 static int decode_pic_hdr(IVI4DecContext *ctx, AVCodecContext *avctx)
163 int pic_size_indx, i, p;
164 IVIPicConfig pic_conf;
166 if (get_bits(&ctx->gb, 18) != 0x3FFF8) {
167 av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
168 return AVERROR_INVALIDDATA;
171 ctx->prev_frame_type = ctx->frame_type;
172 ctx->frame_type = get_bits(&ctx->gb, 3);
173 if (ctx->frame_type == 7) {
174 av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d\n", ctx->frame_type);
175 return AVERROR_INVALIDDATA;
178 #if IVI4_STREAM_ANALYSER
179 if ( ctx->frame_type == FRAMETYPE_BIDIR1
180 || ctx->frame_type == FRAMETYPE_BIDIR)
181 ctx->has_b_frames = 1;
184 ctx->transp_status = get_bits1(&ctx->gb);
185 #if IVI4_STREAM_ANALYSER
186 if (ctx->transp_status) {
191 /* unknown bit: Mac decoder ignores this bit, XANIM returns error */
192 if (get_bits1(&ctx->gb)) {
193 av_log(avctx, AV_LOG_ERROR, "Sync bit is set!\n");
194 return AVERROR_INVALIDDATA;
197 ctx->data_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 24) : 0;
199 /* null frames don't contain anything else so we just return */
200 if (ctx->frame_type >= FRAMETYPE_NULL_FIRST) {
201 av_dlog(avctx, "Null frame encountered!\n");
205 /* Check key lock status. If enabled - ignore lock word. */
206 /* Usually we have to prompt the user for the password, but */
207 /* we don't do that because Indeo 4 videos can be decoded anyway */
208 if (get_bits1(&ctx->gb)) {
209 skip_bits_long(&ctx->gb, 32);
210 av_dlog(avctx, "Password-protected clip!\n");
213 pic_size_indx = get_bits(&ctx->gb, 3);
214 if (pic_size_indx == IVI4_PIC_SIZE_ESC) {
215 pic_conf.pic_height = get_bits(&ctx->gb, 16);
216 pic_conf.pic_width = get_bits(&ctx->gb, 16);
218 pic_conf.pic_height = ivi4_common_pic_sizes[pic_size_indx * 2 + 1];
219 pic_conf.pic_width = ivi4_common_pic_sizes[pic_size_indx * 2 ];
222 /* Decode tile dimensions. */
223 if (get_bits1(&ctx->gb)) {
224 pic_conf.tile_height = scale_tile_size(pic_conf.pic_height, get_bits(&ctx->gb, 4));
225 pic_conf.tile_width = scale_tile_size(pic_conf.pic_width, get_bits(&ctx->gb, 4));
226 #if IVI4_STREAM_ANALYSER
227 ctx->uses_tiling = 1;
230 pic_conf.tile_height = pic_conf.pic_height;
231 pic_conf.tile_width = pic_conf.pic_width;
234 /* Decode chroma subsampling. We support only 4:4 aka YVU9. */
235 if (get_bits(&ctx->gb, 2)) {
236 av_log(avctx, AV_LOG_ERROR, "Only YVU9 picture format is supported!\n");
237 return AVERROR_INVALIDDATA;
239 pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
240 pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2;
242 /* decode subdivision of the planes */
243 pic_conf.luma_bands = decode_plane_subdivision(&ctx->gb);
244 if (pic_conf.luma_bands)
245 pic_conf.chroma_bands = decode_plane_subdivision(&ctx->gb);
246 ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
247 if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
248 av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
249 pic_conf.luma_bands, pic_conf.chroma_bands);
250 return AVERROR_INVALIDDATA;
253 /* check if picture layout was changed and reallocate buffers */
254 if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
255 if (ff_ivi_init_planes(ctx->planes, &pic_conf)) {
256 av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
257 return AVERROR(ENOMEM);
260 ctx->pic_conf = pic_conf;
262 /* set default macroblock/block dimensions */
263 for (p = 0; p <= 2; p++) {
264 for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
265 ctx->planes[p].bands[i].mb_size = !p ? (!ctx->is_scalable ? 16 : 8) : 4;
266 ctx->planes[p].bands[i].blk_size = !p ? 8 : 4;
270 if (ff_ivi_init_tiles(ctx->planes, ctx->pic_conf.tile_width,
271 ctx->pic_conf.tile_height)) {
272 av_log(avctx, AV_LOG_ERROR,
273 "Couldn't reallocate internal structures!\n");
274 return AVERROR(ENOMEM);
278 ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0;
280 /* skip decTimeEst field if present */
281 if (get_bits1(&ctx->gb))
282 skip_bits(&ctx->gb, 8);
284 /* decode macroblock and block huffman codebooks */
285 if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF, &ctx->mb_vlc, avctx) ||
286 ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx))
287 return AVERROR_INVALIDDATA;
289 ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
291 ctx->in_imf = get_bits1(&ctx->gb);
292 ctx->in_q = get_bits1(&ctx->gb);
294 ctx->pic_glob_quant = get_bits(&ctx->gb, 5);
296 /* TODO: ignore this parameter if unused */
297 ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0;
299 ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0;
301 /* skip picture header extension if any */
302 while (get_bits1(&ctx->gb)) {
303 av_dlog(avctx, "Pic hdr extension encountered!\n");
304 skip_bits(&ctx->gb, 8);
307 if (get_bits1(&ctx->gb)) {
308 av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n");
311 align_get_bits(&ctx->gb);
318 * Decode Indeo 4 band header.
320 * @param[in,out] ctx pointer to the decoder context
321 * @param[in,out] band pointer to the band descriptor
322 * @param[in] avctx pointer to the AVCodecContext
323 * @return result code: 0 = OK, negative number = error
325 static int decode_band_hdr(IVI4DecContext *ctx, IVIBandDesc *band,
326 AVCodecContext *avctx)
328 int plane, band_num, indx, transform_id, scan_indx;
331 plane = get_bits(&ctx->gb, 2);
332 band_num = get_bits(&ctx->gb, 4);
333 if (band->plane != plane || band->band_num != band_num) {
334 av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n");
335 return AVERROR_INVALIDDATA;
338 band->is_empty = get_bits1(&ctx->gb);
339 if (!band->is_empty) {
341 * If header size is not given, header size is 4 bytes. */
342 if (get_bits1(&ctx->gb))
343 skip_bits(&ctx->gb, 16);
345 band->is_halfpel = get_bits(&ctx->gb, 2);
346 if (band->is_halfpel >= 2) {
347 av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n",
349 return AVERROR_INVALIDDATA;
351 #if IVI4_STREAM_ANALYSER
352 if (!band->is_halfpel)
353 ctx->uses_fullpel = 1;
356 band->checksum_present = get_bits1(&ctx->gb);
357 if (band->checksum_present)
358 band->checksum = get_bits(&ctx->gb, 16);
360 indx = get_bits(&ctx->gb, 2);
362 av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n");
363 return AVERROR_INVALIDDATA;
365 band->mb_size = 16 >> indx;
366 band->blk_size = 8 >> (indx >> 1);
368 band->inherit_mv = get_bits1(&ctx->gb);
369 band->inherit_qdelta = get_bits1(&ctx->gb);
371 band->glob_quant = get_bits(&ctx->gb, 5);
373 if (!get_bits1(&ctx->gb) || ctx->frame_type == FRAMETYPE_INTRA) {
374 transform_id = get_bits(&ctx->gb, 5);
375 if (transform_id >= FF_ARRAY_ELEMS(transforms) ||
376 !transforms[transform_id].inv_trans) {
377 av_log_ask_for_sample(avctx, "Unimplemented transform: %d!\n", transform_id);
378 return AVERROR_PATCHWELCOME;
380 if ((transform_id >= 7 && transform_id <= 9) ||
381 transform_id == 17) {
382 av_log_ask_for_sample(avctx, "DCT transform not supported yet!\n");
383 return AVERROR_PATCHWELCOME;
386 #if IVI4_STREAM_ANALYSER
387 if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10)
391 band->inv_transform = transforms[transform_id].inv_trans;
392 band->dc_transform = transforms[transform_id].dc_trans;
393 band->is_2d_trans = transforms[transform_id].is_2d_trans;
395 scan_indx = get_bits(&ctx->gb, 4);
396 if (scan_indx == 15) {
397 av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");
398 return AVERROR_INVALIDDATA;
400 band->scan = scan_index_to_tab[scan_indx];
402 band->quant_mat = get_bits(&ctx->gb, 5);
403 if (band->quant_mat == 31) {
404 av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n");
405 return AVERROR_INVALIDDATA;
409 /* decode block huffman codebook */
410 if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF,
411 &band->blk_vlc, avctx))
412 return AVERROR_INVALIDDATA;
414 /* select appropriate rvmap table for this band */
415 band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
417 /* decode rvmap probability corrections if any */
418 band->num_corr = 0; /* there is no corrections */
419 if (get_bits1(&ctx->gb)) {
420 band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
421 if (band->num_corr > 61) {
422 av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
424 return AVERROR_INVALIDDATA;
427 /* read correction pairs */
428 for (i = 0; i < band->num_corr * 2; i++)
429 band->corr[i] = get_bits(&ctx->gb, 8);
433 if (band->blk_size == 8) {
434 band->intra_base = &ivi4_quant_8x8_intra[quant_index_to_tab[band->quant_mat]][0];
435 band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];
437 band->intra_base = &ivi4_quant_4x4_intra[quant_index_to_tab[band->quant_mat]][0];
438 band->inter_base = &ivi4_quant_4x4_inter[quant_index_to_tab[band->quant_mat]][0];
441 /* Indeo 4 doesn't use scale tables */
442 band->intra_scale = NULL;
443 band->inter_scale = NULL;
445 align_get_bits(&ctx->gb);
448 av_log(avctx, AV_LOG_ERROR, "band->scan not set\n");
449 return AVERROR_INVALIDDATA;
457 * Decode information (block type, cbp, quant delta, motion vector)
458 * for all macroblocks in the current tile.
460 * @param[in,out] ctx pointer to the decoder context
461 * @param[in,out] band pointer to the band descriptor
462 * @param[in,out] tile pointer to the tile descriptor
463 * @param[in] avctx pointer to the AVCodecContext
464 * @return result code: 0 = OK, negative number = error
466 static int decode_mb_info(IVI4DecContext *ctx, IVIBandDesc *band,
467 IVITile *tile, AVCodecContext *avctx)
469 int x, y, mv_x, mv_y, mv_delta, offs, mb_offset, blks_per_mb,
470 mv_scale, mb_type_bits, s;
471 IVIMbInfo *mb, *ref_mb;
472 int row_offset = band->mb_size * band->pitch;
475 ref_mb = tile->ref_mbs;
476 offs = tile->ypos * band->pitch + tile->xpos;
478 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
479 mb_type_bits = ctx->frame_type == FRAMETYPE_BIDIR ? 2 : 1;
481 /* scale factor for motion vectors */
482 mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
485 for (y = tile->ypos; y < tile->ypos + tile->height; y += band->mb_size) {
488 for (x = tile->xpos; x < tile->xpos + tile->width; x += band->mb_size) {
491 mb->buf_offs = mb_offset;
493 if (get_bits1(&ctx->gb)) {
494 if (ctx->frame_type == FRAMETYPE_INTRA) {
495 av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
496 return AVERROR_INVALIDDATA;
498 mb->type = 1; /* empty macroblocks are always INTER */
499 mb->cbp = 0; /* all blocks are empty */
502 if (!band->plane && !band->band_num && ctx->in_q) {
503 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
505 mb->q_delta = IVI_TOSIGNED(mb->q_delta);
508 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
509 if (band->inherit_mv) {
510 /* motion vector inheritance */
512 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
513 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
515 mb->mv_x = ref_mb->mv_x;
516 mb->mv_y = ref_mb->mv_y;
520 if (band->inherit_mv) {
521 mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
522 } else if (ctx->frame_type == FRAMETYPE_INTRA) {
523 mb->type = 0; /* mb_type is always INTRA for intra-frames */
525 mb->type = get_bits(&ctx->gb, mb_type_bits);
528 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
531 if (band->inherit_qdelta) {
532 if (ref_mb) mb->q_delta = ref_mb->q_delta;
533 } else if (mb->cbp || (!band->plane && !band->band_num &&
535 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
537 mb->q_delta = IVI_TOSIGNED(mb->q_delta);
541 mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
543 if (band->inherit_mv) {
544 /* motion vector inheritance */
546 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
547 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
549 mb->mv_x = ref_mb->mv_x;
550 mb->mv_y = ref_mb->mv_y;
553 /* decode motion vector deltas */
554 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
556 mv_y += IVI_TOSIGNED(mv_delta);
557 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
559 mv_x += IVI_TOSIGNED(mv_delta);
568 if ( x + (mv_x >>s) + (y+ (mv_y >>s))*band->pitch < 0 ||
569 x + ((mv_x+s)>>s) + band->mb_size - 1
570 + (y+band->mb_size - 1 +((mv_y+s)>>s))*band->pitch > band->height*band->pitch -1) {
571 av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mv_x, y*s + mv_y);
572 return AVERROR_INVALIDDATA;
578 mb_offset += band->mb_size;
584 align_get_bits(&ctx->gb);
591 * Decode an Indeo 4 band.
593 * @param[in,out] ctx pointer to the decoder context
594 * @param[in,out] band pointer to the band descriptor
595 * @param[in] avctx pointer to the AVCodecContext
596 * @return result code: 0 = OK, negative number = error
598 static int decode_band(IVI4DecContext *ctx, int plane_num,
599 IVIBandDesc *band, AVCodecContext *avctx)
601 int result, i, t, pos, idx1, idx2;
604 band->buf = band->bufs[ctx->dst_buf];
605 band->ref_buf = band->bufs[ctx->ref_buf];
607 result = decode_band_hdr(ctx, band, avctx);
609 av_log(avctx, AV_LOG_ERROR, "Error decoding band header\n");
613 if (band->is_empty) {
614 av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");
615 return AVERROR_INVALIDDATA;
618 band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];
620 /* apply corrections to the selected rvmap table if present */
621 for (i = 0; i < band->num_corr; i++) {
622 idx1 = band->corr[i * 2];
623 idx2 = band->corr[i * 2 + 1];
624 FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
625 FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
628 pos = get_bits_count(&ctx->gb);
630 for (t = 0; t < band->num_tiles; t++) {
631 tile = &band->tiles[t];
633 tile->is_empty = get_bits1(&ctx->gb);
634 if (tile->is_empty) {
635 ff_ivi_process_empty_tile(avctx, band, tile,
636 (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
637 av_dlog(avctx, "Empty tile encountered!\n");
639 tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
640 if (!tile->data_size) {
641 av_log(avctx, AV_LOG_ERROR, "Tile data size is zero!\n");
642 return AVERROR_INVALIDDATA;
645 result = decode_mb_info(ctx, band, tile, avctx);
649 result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
650 if (result < 0 || ((get_bits_count(&ctx->gb) - pos) >> 3) != tile->data_size) {
651 av_log(avctx, AV_LOG_ERROR, "Corrupted tile data encountered!\n");
655 pos += tile->data_size << 3; // skip to next tile
659 /* restore the selected rvmap table by applying its corrections in reverse order */
660 for (i = band->num_corr - 1; i >= 0; i--) {
661 idx1 = band->corr[i * 2];
662 idx2 = band->corr[i * 2 + 1];
663 FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
664 FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
667 #if defined(DEBUG) && IVI4_DEBUG_CHECKSUM
668 if (band->checksum_present) {
669 uint16_t chksum = ivi_calc_band_checksum(band);
670 if (chksum != band->checksum) {
671 av_log(avctx, AV_LOG_ERROR,
672 "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",
673 band->plane, band->band_num, band->checksum, chksum);
678 align_get_bits(&ctx->gb);
684 static av_cold int decode_init(AVCodecContext *avctx)
686 IVI4DecContext *ctx = avctx->priv_data;
688 ff_ivi_init_static_vlc();
690 /* copy rvmap tables in our context so we can apply changes to them */
691 memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
693 /* Force allocation of the internal buffers */
694 /* during picture header decoding. */
695 ctx->pic_conf.pic_width = 0;
696 ctx->pic_conf.pic_height = 0;
698 avctx->pix_fmt = PIX_FMT_YUV410P;
705 * Rearrange decoding and reference buffers.
707 * @param[in,out] ctx pointer to the decoder context
709 static void switch_buffers(IVI4DecContext *ctx)
711 switch (ctx->prev_frame_type) {
712 case FRAMETYPE_INTRA:
713 case FRAMETYPE_INTER:
714 ctx->buf_switch ^= 1;
715 ctx->dst_buf = ctx->buf_switch;
716 ctx->ref_buf = ctx->buf_switch ^ 1;
718 case FRAMETYPE_INTER_NOREF:
722 switch (ctx->frame_type) {
723 case FRAMETYPE_INTRA:
726 case FRAMETYPE_INTER:
727 ctx->dst_buf = ctx->buf_switch;
728 ctx->ref_buf = ctx->buf_switch ^ 1;
730 case FRAMETYPE_INTER_NOREF:
731 case FRAMETYPE_NULL_FIRST:
732 case FRAMETYPE_NULL_LAST:
738 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
741 IVI4DecContext *ctx = avctx->priv_data;
742 const uint8_t *buf = avpkt->data;
743 int buf_size = avpkt->size;
746 init_get_bits(&ctx->gb, buf, buf_size * 8);
748 result = decode_pic_hdr(ctx, avctx);
750 av_log(avctx, AV_LOG_ERROR, "Error decoding picture header\n");
756 if (ctx->frame_type < FRAMETYPE_NULL_FIRST) {
757 for (p = 0; p < 3; p++) {
758 for (b = 0; b < ctx->planes[p].num_bands; b++) {
759 result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);
761 av_log(avctx, AV_LOG_ERROR,
762 "Error decoding band: %d, plane: %d\n", b, p);
769 /* If the bidirectional mode is enabled, next I and the following P frame will */
770 /* be sent together. Unfortunately the approach below seems to be the only way */
771 /* to handle the B-frames mode. That's exactly the same Intel decoders do. */
772 if (ctx->frame_type == FRAMETYPE_INTRA) {
773 while (get_bits(&ctx->gb, 8)); // skip version string
774 skip_bits_long(&ctx->gb, 64); // skip padding, TODO: implement correct 8-bytes alignment
775 if (get_bits_left(&ctx->gb) > 18 && show_bits(&ctx->gb, 18) == 0x3FFF8)
776 av_log(avctx, AV_LOG_ERROR, "Buffer contains IP frames!\n");
779 if (ctx->frame_type >= FRAMETYPE_NULL_FIRST)
782 if (ctx->frame.data[0])
783 avctx->release_buffer(avctx, &ctx->frame);
785 ctx->frame.reference = 0;
786 if ((result = avctx->get_buffer(avctx, &ctx->frame)) < 0) {
787 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
791 if (ctx->is_scalable) {
792 ff_ivi_recompose_haar(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);
794 ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);
797 ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);
798 ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);
800 *data_size = sizeof(AVFrame);
801 *(AVFrame*)data = ctx->frame;
807 static av_cold int decode_close(AVCodecContext *avctx)
809 IVI4DecContext *ctx = avctx->priv_data;
811 ff_ivi_free_buffers(&ctx->planes[0]);
813 if (ctx->frame.data[0])
814 avctx->release_buffer(avctx, &ctx->frame);
816 #if IVI4_STREAM_ANALYSER
817 if (ctx->is_scalable)
818 av_log(avctx, AV_LOG_ERROR, "This video uses scalability mode!\n");
819 if (ctx->uses_tiling)
820 av_log(avctx, AV_LOG_ERROR, "This video uses local decoding!\n");
821 if (ctx->has_b_frames)
822 av_log(avctx, AV_LOG_ERROR, "This video contains B-frames!\n");
824 av_log(avctx, AV_LOG_ERROR, "Transparency mode is enabled!\n");
826 av_log(avctx, AV_LOG_ERROR, "This video uses Haar transform!\n");
827 if (ctx->uses_fullpel)
828 av_log(avctx, AV_LOG_ERROR, "This video uses fullpel motion vectors!\n");
835 AVCodec ff_indeo4_decoder = {
837 .type = AVMEDIA_TYPE_VIDEO,
838 .id = CODEC_ID_INDEO4,
839 .priv_data_size = sizeof(IVI4DecContext),
841 .close = decode_close,
842 .decode = decode_frame,
843 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),