2 * Indeo Video Interactive v4 compatible decoder
3 * Copyright (c) 2009-2011 Maxim Poliakovski
5 * This file is part of FFmpeg.
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.
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.
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
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
33 #include "indeo4data.h"
38 #define IVI4_PIC_SIZE_ESC 7
42 InvTransformPtr *inv_trans;
43 DCTransformPtr *dc_trans;
46 { ff_ivi_inverse_haar_8x8, ff_ivi_dc_haar_2d, 1 },
47 { ff_ivi_row_haar8, ff_ivi_dc_haar_2d, 0 },
48 { ff_ivi_col_haar8, ff_ivi_dc_haar_2d, 0 },
49 { ff_ivi_put_pixels_8x8, ff_ivi_put_dc_pixel_8x8, 1 },
50 { ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d, 1 },
51 { ff_ivi_row_slant8, ff_ivi_dc_row_slant, 1 },
52 { ff_ivi_col_slant8, ff_ivi_dc_col_slant, 1 },
53 { NULL, NULL, 0 }, /* inverse DCT 8x8 */
54 { NULL, NULL, 0 }, /* inverse DCT 8x1 */
55 { NULL, NULL, 0 }, /* inverse DCT 1x8 */
56 { ff_ivi_inverse_haar_4x4, ff_ivi_dc_haar_2d, 1 },
57 { ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d, 1 },
58 { NULL, NULL, 0 }, /* no transform 4x4 */
59 { ff_ivi_row_haar4, ff_ivi_dc_haar_2d, 0 },
60 { ff_ivi_col_haar4, ff_ivi_dc_haar_2d, 0 },
61 { ff_ivi_row_slant4, ff_ivi_dc_row_slant, 0 },
62 { ff_ivi_col_slant4, ff_ivi_dc_col_slant, 0 },
63 { NULL, NULL, 0 }, /* inverse DCT 4x4 */
67 * Decode subdivision of a plane.
68 * This is a simplified version that checks for two supported subdivisions:
69 * - 1 wavelet band per plane, size factor 1:1, code pattern: 3
70 * - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3
71 * Anything else is either unsupported or corrupt.
73 * @param[in,out] gb the GetBit context
74 * @return number of wavelet bands or 0 on error
76 static int decode_plane_subdivision(GetBitContext *gb)
80 switch (get_bits(gb, 2)) {
84 for (i = 0; i < 4; i++)
85 if (get_bits(gb, 2) != 3)
93 static inline int scale_tile_size(int def_size, int size_factor)
95 return size_factor == 15 ? def_size : (size_factor + 1) << 5;
99 * Decode Indeo 4 picture header.
101 * @param[in,out] ctx pointer to the decoder context
102 * @param[in] avctx pointer to the AVCodecContext
103 * @return result code: 0 = OK, negative number = error
105 static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)
107 int pic_size_indx, i, p;
108 IVIPicConfig pic_conf;
110 if (get_bits(&ctx->gb, 18) != 0x3FFF8) {
111 av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
112 return AVERROR_INVALIDDATA;
115 ctx->prev_frame_type = ctx->frame_type;
116 ctx->frame_type = get_bits(&ctx->gb, 3);
117 if (ctx->frame_type == 7) {
118 av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d\n", ctx->frame_type);
119 return AVERROR_INVALIDDATA;
122 if (ctx->frame_type == IVI4_FRAMETYPE_BIDIR)
123 ctx->has_b_frames = 1;
125 ctx->has_transp = get_bits1(&ctx->gb);
127 /* unknown bit: Mac decoder ignores this bit, XANIM returns error */
128 if (get_bits1(&ctx->gb)) {
129 av_log(avctx, AV_LOG_ERROR, "Sync bit is set!\n");
130 return AVERROR_INVALIDDATA;
133 ctx->data_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 24) : 0;
135 /* null frames don't contain anything else so we just return */
136 if (ctx->frame_type >= IVI4_FRAMETYPE_NULL_FIRST) {
137 ff_dlog(avctx, "Null frame encountered!\n");
141 /* Check key lock status. If enabled - ignore lock word. */
142 /* Usually we have to prompt the user for the password, but */
143 /* we don't do that because Indeo 4 videos can be decoded anyway */
144 if (get_bits1(&ctx->gb)) {
145 skip_bits_long(&ctx->gb, 32);
146 ff_dlog(avctx, "Password-protected clip!\n");
149 pic_size_indx = get_bits(&ctx->gb, 3);
150 if (pic_size_indx == IVI4_PIC_SIZE_ESC) {
151 pic_conf.pic_height = get_bits(&ctx->gb, 16);
152 pic_conf.pic_width = get_bits(&ctx->gb, 16);
154 pic_conf.pic_height = ivi4_common_pic_sizes[pic_size_indx * 2 + 1];
155 pic_conf.pic_width = ivi4_common_pic_sizes[pic_size_indx * 2 ];
158 /* Decode tile dimensions. */
159 ctx->uses_tiling = get_bits1(&ctx->gb);
160 if (ctx->uses_tiling) {
161 pic_conf.tile_height = scale_tile_size(pic_conf.pic_height, get_bits(&ctx->gb, 4));
162 pic_conf.tile_width = scale_tile_size(pic_conf.pic_width, get_bits(&ctx->gb, 4));
164 pic_conf.tile_height = pic_conf.pic_height;
165 pic_conf.tile_width = pic_conf.pic_width;
168 /* Decode chroma subsampling. We support only 4:4 aka YVU9. */
169 if (get_bits(&ctx->gb, 2)) {
170 av_log(avctx, AV_LOG_ERROR, "Only YVU9 picture format is supported!\n");
171 return AVERROR_INVALIDDATA;
173 pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
174 pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2;
176 /* decode subdivision of the planes */
177 pic_conf.luma_bands = decode_plane_subdivision(&ctx->gb);
178 pic_conf.chroma_bands = 0;
179 if (pic_conf.luma_bands)
180 pic_conf.chroma_bands = decode_plane_subdivision(&ctx->gb);
181 ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
182 if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
183 av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
184 pic_conf.luma_bands, pic_conf.chroma_bands);
185 return AVERROR_INVALIDDATA;
188 /* check if picture layout was changed and reallocate buffers */
189 if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
190 if (ff_ivi_init_planes(avctx, ctx->planes, &pic_conf, 1)) {
191 av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
192 ctx->pic_conf.luma_bands = 0;
193 return AVERROR(ENOMEM);
196 ctx->pic_conf = pic_conf;
198 /* set default macroblock/block dimensions */
199 for (p = 0; p <= 2; p++) {
200 for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
201 ctx->planes[p].bands[i].mb_size = !p ? (!ctx->is_scalable ? 16 : 8) : 4;
202 ctx->planes[p].bands[i].blk_size = !p ? 8 : 4;
206 if (ff_ivi_init_tiles(ctx->planes, ctx->pic_conf.tile_width,
207 ctx->pic_conf.tile_height)) {
208 av_log(avctx, AV_LOG_ERROR,
209 "Couldn't reallocate internal structures!\n");
210 return AVERROR(ENOMEM);
214 ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0;
216 /* skip decTimeEst field if present */
217 if (get_bits1(&ctx->gb))
218 skip_bits(&ctx->gb, 8);
220 /* decode macroblock and block huffman codebooks */
221 if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF, &ctx->mb_vlc, avctx) ||
222 ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx))
223 return AVERROR_INVALIDDATA;
225 ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
227 ctx->in_imf = get_bits1(&ctx->gb);
228 ctx->in_q = get_bits1(&ctx->gb);
230 ctx->pic_glob_quant = get_bits(&ctx->gb, 5);
232 /* TODO: ignore this parameter if unused */
233 ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0;
235 ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0;
237 /* skip picture header extension if any */
238 while (get_bits1(&ctx->gb)) {
239 ff_dlog(avctx, "Pic hdr extension encountered!\n");
240 if (get_bits_left(&ctx->gb) < 10)
241 return AVERROR_INVALIDDATA;
242 skip_bits(&ctx->gb, 8);
245 if (get_bits1(&ctx->gb)) {
246 av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n");
249 align_get_bits(&ctx->gb);
256 * Decode Indeo 4 band header.
258 * @param[in,out] ctx pointer to the decoder context
259 * @param[in,out] band pointer to the band descriptor
260 * @param[in] avctx pointer to the AVCodecContext
261 * @return result code: 0 = OK, negative number = error
263 static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,
264 AVCodecContext *avctx)
266 int plane, band_num, indx, transform_id, scan_indx;
270 plane = get_bits(&ctx->gb, 2);
271 band_num = get_bits(&ctx->gb, 4);
272 if (band->plane != plane || band->band_num != band_num) {
273 av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n");
274 return AVERROR_INVALIDDATA;
277 band->is_empty = get_bits1(&ctx->gb);
278 if (!band->is_empty) {
279 int old_blk_size = band->blk_size;
281 * If header size is not given, header size is 4 bytes. */
282 if (get_bits1(&ctx->gb))
283 skip_bits(&ctx->gb, 16);
285 band->is_halfpel = get_bits(&ctx->gb, 2);
286 if (band->is_halfpel >= 2) {
287 av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n",
289 return AVERROR_INVALIDDATA;
291 if (!band->is_halfpel)
292 ctx->uses_fullpel = 1;
294 band->checksum_present = get_bits1(&ctx->gb);
295 if (band->checksum_present)
296 band->checksum = get_bits(&ctx->gb, 16);
298 indx = get_bits(&ctx->gb, 2);
300 av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n");
301 return AVERROR_INVALIDDATA;
303 band->mb_size = 16 >> indx;
304 band->blk_size = 8 >> (indx >> 1);
306 band->inherit_mv = get_bits1(&ctx->gb);
307 band->inherit_qdelta = get_bits1(&ctx->gb);
309 band->glob_quant = get_bits(&ctx->gb, 5);
311 if (!get_bits1(&ctx->gb) || ctx->frame_type == IVI4_FRAMETYPE_INTRA) {
312 transform_id = get_bits(&ctx->gb, 5);
313 if (transform_id >= FF_ARRAY_ELEMS(transforms) ||
314 !transforms[transform_id].inv_trans) {
315 avpriv_request_sample(avctx, "Transform %d", transform_id);
316 return AVERROR_PATCHWELCOME;
318 if ((transform_id >= 7 && transform_id <= 9) ||
319 transform_id == 17) {
320 avpriv_request_sample(avctx, "DCT transform");
321 return AVERROR_PATCHWELCOME;
324 if (transform_id < 10 && band->blk_size < 8) {
325 av_log(avctx, AV_LOG_ERROR, "wrong transform size!\n");
326 return AVERROR_INVALIDDATA;
328 if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10)
331 band->inv_transform = transforms[transform_id].inv_trans;
332 band->dc_transform = transforms[transform_id].dc_trans;
333 band->is_2d_trans = transforms[transform_id].is_2d_trans;
335 if (transform_id < 10)
336 band->transform_size = 8;
338 band->transform_size = 4;
340 if (band->blk_size != band->transform_size) {
341 av_log(avctx, AV_LOG_ERROR, "transform and block size mismatch (%d != %d)\n", band->transform_size, band->blk_size);
342 return AVERROR_INVALIDDATA;
345 scan_indx = get_bits(&ctx->gb, 4);
346 if (scan_indx == 15) {
347 av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");
348 return AVERROR_INVALIDDATA;
350 if (scan_indx > 4 && scan_indx < 10) {
351 if (band->blk_size != 4) {
352 av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
353 return AVERROR_INVALIDDATA;
355 } else if (band->blk_size != 8) {
356 av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
357 return AVERROR_INVALIDDATA;
360 band->scan = scan_index_to_tab[scan_indx];
361 band->scan_size = band->blk_size;
363 quant_mat = get_bits(&ctx->gb, 5);
364 if (quant_mat == 31) {
365 av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n");
366 return AVERROR_INVALIDDATA;
368 if (quant_mat >= FF_ARRAY_ELEMS(quant_index_to_tab)) {
369 avpriv_request_sample(avctx, "Quantization matrix %d",
371 return AVERROR_INVALIDDATA;
373 band->quant_mat = quant_mat;
375 if (old_blk_size != band->blk_size) {
376 av_log(avctx, AV_LOG_ERROR,
377 "The band block size does not match the configuration "
379 return AVERROR_INVALIDDATA;
382 if (quant_index_to_tab[band->quant_mat] > 4 && band->blk_size == 4) {
383 av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix for 4x4 block encountered!\n");
385 return AVERROR_INVALIDDATA;
387 if (band->scan_size != band->blk_size) {
388 av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
389 return AVERROR_INVALIDDATA;
391 if (band->transform_size == 8 && band->blk_size < 8) {
392 av_log(avctx, AV_LOG_ERROR, "mismatching transform_size!\n");
393 return AVERROR_INVALIDDATA;
396 /* decode block huffman codebook */
397 if (!get_bits1(&ctx->gb))
398 band->blk_vlc.tab = ctx->blk_vlc.tab;
400 if (ff_ivi_dec_huff_desc(&ctx->gb, 1, IVI_BLK_HUFF,
401 &band->blk_vlc, avctx))
402 return AVERROR_INVALIDDATA;
404 /* select appropriate rvmap table for this band */
405 band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
407 /* decode rvmap probability corrections if any */
408 band->num_corr = 0; /* there is no corrections */
409 if (get_bits1(&ctx->gb)) {
410 band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
411 if (band->num_corr > 61) {
412 av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
414 return AVERROR_INVALIDDATA;
417 /* read correction pairs */
418 for (i = 0; i < band->num_corr * 2; i++)
419 band->corr[i] = get_bits(&ctx->gb, 8);
423 if (band->blk_size == 8) {
424 band->intra_base = &ivi4_quant_8x8_intra[quant_index_to_tab[band->quant_mat]][0];
425 band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];
427 band->intra_base = &ivi4_quant_4x4_intra[quant_index_to_tab[band->quant_mat]][0];
428 band->inter_base = &ivi4_quant_4x4_inter[quant_index_to_tab[band->quant_mat]][0];
431 /* Indeo 4 doesn't use scale tables */
432 band->intra_scale = NULL;
433 band->inter_scale = NULL;
435 align_get_bits(&ctx->gb);
438 av_log(avctx, AV_LOG_ERROR, "band->scan not set\n");
439 return AVERROR_INVALIDDATA;
447 * Decode information (block type, cbp, quant delta, motion vector)
448 * for all macroblocks in the current tile.
450 * @param[in,out] ctx pointer to the decoder context
451 * @param[in,out] band pointer to the band descriptor
452 * @param[in,out] tile pointer to the tile descriptor
453 * @param[in] avctx pointer to the AVCodecContext
454 * @return result code: 0 = OK, negative number = error
456 static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,
457 IVITile *tile, AVCodecContext *avctx)
459 int x, y, mv_x, mv_y, mv_delta, offs, mb_offset, blks_per_mb,
460 mv_scale, mb_type_bits, s;
461 IVIMbInfo *mb, *ref_mb;
462 int row_offset = band->mb_size * band->pitch;
465 ref_mb = tile->ref_mbs;
466 offs = tile->ypos * band->pitch + tile->xpos;
468 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
469 mb_type_bits = ctx->frame_type == IVI4_FRAMETYPE_BIDIR ? 2 : 1;
471 /* scale factor for motion vectors */
472 mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
475 if (((tile->width + band->mb_size-1)/band->mb_size) * ((tile->height + band->mb_size-1)/band->mb_size) != tile->num_MBs) {
476 av_log(avctx, AV_LOG_ERROR, "num_MBs mismatch %d %d %d %d\n", tile->width, tile->height, band->mb_size, tile->num_MBs);
480 for (y = tile->ypos; y < tile->ypos + tile->height; y += band->mb_size) {
483 for (x = tile->xpos; x < tile->xpos + tile->width; x += band->mb_size) {
486 mb->buf_offs = mb_offset;
490 if (get_bits1(&ctx->gb)) {
491 if (ctx->frame_type == IVI4_FRAMETYPE_INTRA) {
492 av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
493 return AVERROR_INVALIDDATA;
495 mb->type = 1; /* empty macroblocks are always INTER */
496 mb->cbp = 0; /* all blocks are empty */
499 if (!band->plane && !band->band_num && ctx->in_q) {
500 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
502 mb->q_delta = IVI_TOSIGNED(mb->q_delta);
505 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
506 if (band->inherit_mv && ref_mb) {
507 /* motion vector inheritance */
509 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
510 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
512 mb->mv_x = ref_mb->mv_x;
513 mb->mv_y = ref_mb->mv_y;
517 if (band->inherit_mv) {
518 /* copy mb_type from corresponding reference mb */
520 av_log(avctx, AV_LOG_ERROR, "ref_mb unavailable\n");
521 return AVERROR_INVALIDDATA;
523 mb->type = ref_mb->type;
524 } else if (ctx->frame_type == IVI4_FRAMETYPE_INTRA ||
525 ctx->frame_type == IVI4_FRAMETYPE_INTRA1) {
526 mb->type = 0; /* mb_type is always INTRA for intra-frames */
528 mb->type = get_bits(&ctx->gb, mb_type_bits);
531 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
534 if (band->inherit_qdelta) {
535 if (ref_mb) mb->q_delta = ref_mb->q_delta;
536 } else if (mb->cbp || (!band->plane && !band->band_num &&
538 mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
540 mb->q_delta = IVI_TOSIGNED(mb->q_delta);
544 mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
546 if (band->inherit_mv) {
548 /* motion vector inheritance */
550 mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
551 mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
553 mb->mv_x = ref_mb->mv_x;
554 mb->mv_y = ref_mb->mv_y;
557 /* decode motion vector deltas */
558 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
560 mv_y += IVI_TOSIGNED(mv_delta);
561 mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
563 mv_x += IVI_TOSIGNED(mv_delta);
567 mv_delta = get_vlc2(&ctx->gb,
568 ctx->mb_vlc.tab->table,
570 mv_y += IVI_TOSIGNED(mv_delta);
571 mv_delta = get_vlc2(&ctx->gb,
572 ctx->mb_vlc.tab->table,
574 mv_x += IVI_TOSIGNED(mv_delta);
580 mb->b_mv_x = -mb->mv_x;
581 mb->b_mv_y = -mb->mv_y;
590 if ( x + (mb->mv_x >>s) + (y+ (mb->mv_y >>s))*band->pitch < 0 ||
591 x + ((mb->mv_x+s)>>s) + band->mb_size - 1
592 + (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize -1) {
593 av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);
594 return AVERROR_INVALIDDATA;
600 mb_offset += band->mb_size;
606 align_get_bits(&ctx->gb);
613 * Rearrange decoding and reference buffers.
615 * @param[in,out] ctx pointer to the decoder context
617 static void switch_buffers(IVI45DecContext *ctx)
619 int is_prev_ref = 0, is_ref = 0;
621 switch (ctx->prev_frame_type) {
622 case IVI4_FRAMETYPE_INTRA:
623 case IVI4_FRAMETYPE_INTRA1:
624 case IVI4_FRAMETYPE_INTER:
629 switch (ctx->frame_type) {
630 case IVI4_FRAMETYPE_INTRA:
631 case IVI4_FRAMETYPE_INTRA1:
632 case IVI4_FRAMETYPE_INTER:
637 if (is_prev_ref && is_ref) {
638 FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
639 } else if (is_prev_ref) {
640 FFSWAP(int, ctx->ref_buf, ctx->b_ref_buf);
641 FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
646 static int is_nonnull_frame(IVI45DecContext *ctx)
648 return ctx->frame_type < IVI4_FRAMETYPE_NULL_FIRST;
652 static av_cold int decode_init(AVCodecContext *avctx)
654 IVI45DecContext *ctx = avctx->priv_data;
656 ff_ivi_init_static_vlc();
658 /* copy rvmap tables in our context so we can apply changes to them */
659 memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
661 /* Force allocation of the internal buffers */
662 /* during picture header decoding. */
663 ctx->pic_conf.pic_width = 0;
664 ctx->pic_conf.pic_height = 0;
666 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
668 ctx->decode_pic_hdr = decode_pic_hdr;
669 ctx->decode_band_hdr = decode_band_hdr;
670 ctx->decode_mb_info = decode_mb_info;
671 ctx->switch_buffers = switch_buffers;
672 ctx->is_nonnull_frame = is_nonnull_frame;
675 ctx->show_indeo4_info = 1;
679 ctx->b_ref_buf = 3; /* buffer 2 is used for scalability mode */
680 ctx->p_frame = av_frame_alloc();
682 return AVERROR(ENOMEM);
688 AVCodec ff_indeo4_decoder = {
690 .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),
691 .type = AVMEDIA_TYPE_VIDEO,
692 .id = AV_CODEC_ID_INDEO4,
693 .priv_data_size = sizeof(IVI45DecContext),
695 .close = ff_ivi_decode_close,
696 .decode = ff_ivi_decode_frame,
697 .capabilities = AV_CODEC_CAP_DR1,