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1
/*
2
 * Indeo Video Interactive v5 compatible decoder
3
 * Copyright (c) 2009 Maxim Poliakovski
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
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
/**
23
 * @file
24
 * Indeo Video Interactive version 5 decoder
25
 *
26
 * Indeo5 data is usually transported within .avi or .mov files.
27
 * Known FOURCCs: 'IV50'
28
 */
29

    
30
#define ALT_BITSTREAM_READER_LE
31
#include "avcodec.h"
32
#include "get_bits.h"
33
#include "dsputil.h"
34
#include "ivi_dsp.h"
35
#include "ivi_common.h"
36
#include "indeo5data.h"
37

    
38
/**
39
 *  Indeo5 frame types.
40
 */
41
enum {
42
    FRAMETYPE_INTRA       = 0,
43
    FRAMETYPE_INTER       = 1,  ///< non-droppable P-frame
44
    FRAMETYPE_INTER_SCAL  = 2,  ///< droppable P-frame used in the scalability mode
45
    FRAMETYPE_INTER_NOREF = 3,  ///< droppable P-frame
46
    FRAMETYPE_NULL        = 4   ///< empty frame with no data
47
};
48

    
49
#define IVI5_PIC_SIZE_ESC       15
50

    
51
#define IVI5_IS_PROTECTED       0x20
52

    
53
typedef struct {
54
    GetBitContext   gb;
55
    AVFrame         frame;
56
    RVMapDesc       rvmap_tabs[9];   ///< local corrected copy of the static rvmap tables
57
    IVIPlaneDesc    planes[3];       ///< color planes
58
    const uint8_t   *frame_data;     ///< input frame data pointer
59
    int             buf_switch;      ///< used to switch between three buffers
60
    int             inter_scal;      ///< signals a sequence of scalable inter frames
61
    int             dst_buf;         ///< buffer index for the currently decoded frame
62
    int             ref_buf;         ///< inter frame reference buffer index
63
    int             ref2_buf;        ///< temporal storage for switching buffers
64
    uint32_t        frame_size;      ///< frame size in bytes
65
    int             frame_type;
66
    int             prev_frame_type; ///< frame type of the previous frame
67
    int             frame_num;
68
    uint32_t        pic_hdr_size;    ///< picture header size in bytes
69
    uint8_t         frame_flags;
70
    uint16_t        checksum;        ///< frame checksum
71

    
72
    IVIHuffTab      mb_vlc;          ///< vlc table for decoding macroblock data
73

    
74
    uint16_t        gop_hdr_size;
75
    uint8_t         gop_flags;
76
    int             is_scalable;
77
    uint32_t        lock_word;
78
    IVIPicConfig    pic_conf;
79
} IVI5DecContext;
80

    
81

    
82
/**
83
 *  Decode Indeo5 GOP (Group of pictures) header.
84
 *  This header is present in key frames only.
85
 *  It defines parameters for all frames in a GOP.
86
 *
87
 *  @param[in,out] ctx    ptr to the decoder context
88
 *  @param[in]     avctx  ptr to the AVCodecContext
89
 *  @return         result code: 0 = OK, -1 = error
90
 */
91
static int decode_gop_header(IVI5DecContext *ctx, AVCodecContext *avctx)
92
{
93
    int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size;
94
    int             quant_mat, blk_size_changed = 0;
95
    IVIBandDesc     *band, *band1, *band2;
96
    IVIPicConfig    pic_conf;
97

    
98
    ctx->gop_flags = get_bits(&ctx->gb, 8);
99

    
100
    ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;
101

    
102
    if (ctx->gop_flags & IVI5_IS_PROTECTED)
103
        ctx->lock_word = get_bits_long(&ctx->gb, 32);
104

    
105
    tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;
106
    if (tile_size > 256) {
107
        av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
108
        return -1;
109
    }
110

    
111
    /* decode number of wavelet bands */
112
    /* num_levels * 3 + 1 */
113
    pic_conf.luma_bands   = get_bits(&ctx->gb, 2) * 3 + 1;
114
    pic_conf.chroma_bands = get_bits1(&ctx->gb)   * 3 + 1;
115
    ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
116
    if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
117
        av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
118
               pic_conf.luma_bands, pic_conf.chroma_bands);
119
        return -1;
120
    }
121

    
122
    pic_size_indx = get_bits(&ctx->gb, 4);
123
    if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
124
        pic_conf.pic_height = get_bits(&ctx->gb, 13);
125
        pic_conf.pic_width  = get_bits(&ctx->gb, 13);
126
    } else {
127
        pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;
128
        pic_conf.pic_width  = ivi5_common_pic_sizes[pic_size_indx * 2    ] << 2;
129
    }
130

    
131
    if (ctx->gop_flags & 2) {
132
        av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n");
133
        return -1;
134
    }
135

    
136
    pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
137
    pic_conf.chroma_width  = (pic_conf.pic_width  + 3) >> 2;
138

    
139
    if (!tile_size) {
140
        pic_conf.tile_height = pic_conf.pic_height;
141
        pic_conf.tile_width  = pic_conf.pic_width;
142
    } else {
143
        pic_conf.tile_height = pic_conf.tile_width = tile_size;
144
    }
145

    
146
    /* check if picture layout was changed and reallocate buffers */
147
    if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
148
        result = ff_ivi_init_planes(ctx->planes, &pic_conf);
149
        if (result) {
150
            av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
151
            return -1;
152
        }
153
        ctx->pic_conf = pic_conf;
154
        blk_size_changed = 1; /* force reallocation of the internal structures */
155
    }
156

    
157
    for (p = 0; p <= 1; p++) {
158
        for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
159
            band = &ctx->planes[p].bands[i];
160

    
161
            band->is_halfpel = get_bits1(&ctx->gb);
162

    
163
            mb_size  = get_bits1(&ctx->gb);
164
            blk_size = 8 >> get_bits1(&ctx->gb);
165
            mb_size  = blk_size << !mb_size;
166

    
167
            blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
168
            if (blk_size_changed) {
169
                band->mb_size  = mb_size;
170
                band->blk_size = blk_size;
171
            }
172

    
173
            if (get_bits1(&ctx->gb)) {
174
                av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n");
175
                return -1;
176
            }
177

    
178
            /* select transform function and scan pattern according to plane and band number */
179
            switch ((p << 2) + i) {
180
            case 0:
181
                band->inv_transform = ff_ivi_inverse_slant_8x8;
182
                band->dc_transform  = ff_ivi_dc_slant_2d;
183
                band->scan          = ff_zigzag_direct;
184
                break;
185

    
186
            case 1:
187
                band->inv_transform = ff_ivi_row_slant8;
188
                band->dc_transform  = ff_ivi_dc_row_slant;
189
                band->scan          = ff_ivi_vertical_scan_8x8;
190
                break;
191

    
192
            case 2:
193
                band->inv_transform = ff_ivi_col_slant8;
194
                band->dc_transform  = ff_ivi_dc_col_slant;
195
                band->scan          = ff_ivi_horizontal_scan_8x8;
196
                break;
197

    
198
            case 3:
199
                band->inv_transform = ff_ivi_put_pixels_8x8;
200
                band->dc_transform  = ff_ivi_put_dc_pixel_8x8;
201
                band->scan          = ff_ivi_horizontal_scan_8x8;
202
                break;
203

    
204
            case 4:
205
                band->inv_transform = ff_ivi_inverse_slant_4x4;
206
                band->dc_transform  = ff_ivi_dc_slant_2d;
207
                band->scan          = ff_ivi_direct_scan_4x4;
208
                break;
209
            }
210

    
211
            band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
212
                                band->inv_transform == ff_ivi_inverse_slant_4x4;
213

    
214
            /* select dequant matrix according to plane and band number */
215
            if (!p) {
216
                quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
217
            } else {
218
                quant_mat = 5;
219
            }
220

    
221
            if (band->blk_size == 8) {
222
                band->intra_base  = &ivi5_base_quant_8x8_intra[quant_mat][0];
223
                band->inter_base  = &ivi5_base_quant_8x8_inter[quant_mat][0];
224
                band->intra_scale = &ivi5_scale_quant_8x8_intra[quant_mat][0];
225
                band->inter_scale = &ivi5_scale_quant_8x8_inter[quant_mat][0];
226
            } else {
227
                band->intra_base  = ivi5_base_quant_4x4_intra;
228
                band->inter_base  = ivi5_base_quant_4x4_inter;
229
                band->intra_scale = ivi5_scale_quant_4x4_intra;
230
                band->inter_scale = ivi5_scale_quant_4x4_inter;
231
            }
232

    
233
            if (get_bits(&ctx->gb, 2)) {
234
                av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
235
                return -1;
236
            }
237
        }
238
    }
239

    
240
    /* copy chroma parameters into the 2nd chroma plane */
241
    for (i = 0; i < pic_conf.chroma_bands; i++) {
242
        band1 = &ctx->planes[1].bands[i];
243
        band2 = &ctx->planes[2].bands[i];
244

    
245
        band2->width         = band1->width;
246
        band2->height        = band1->height;
247
        band2->mb_size       = band1->mb_size;
248
        band2->blk_size      = band1->blk_size;
249
        band2->is_halfpel    = band1->is_halfpel;
250
        band2->intra_base    = band1->intra_base;
251
        band2->inter_base    = band1->inter_base;
252
        band2->intra_scale   = band1->intra_scale;
253
        band2->inter_scale   = band1->inter_scale;
254
        band2->scan          = band1->scan;
255
        band2->inv_transform = band1->inv_transform;
256
        band2->dc_transform  = band1->dc_transform;
257
        band2->is_2d_trans   = band1->is_2d_trans;
258
    }
259

    
260
    /* reallocate internal structures if needed */
261
    if (blk_size_changed) {
262
        result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
263
                                   pic_conf.tile_height);
264
        if (result) {
265
            av_log(avctx, AV_LOG_ERROR,
266
                   "Couldn't reallocate internal structures!\n");
267
            return -1;
268
        }
269
    }
270

    
271
    if (ctx->gop_flags & 8) {
272
        if (get_bits(&ctx->gb, 3)) {
273
            av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
274
            return -1;
275
        }
276

    
277
        if (get_bits1(&ctx->gb))
278
            skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
279
    }
280

    
281
    align_get_bits(&ctx->gb);
282

    
283
    skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
284

    
285
    /* skip GOP extension if any */
286
    if (get_bits1(&ctx->gb)) {
287
        do {
288
            i = get_bits(&ctx->gb, 16);
289
        } while (i & 0x8000);
290
    }
291

    
292
    align_get_bits(&ctx->gb);
293

    
294
    return 0;
295
}
296

    
297

    
298
/**
299
 *  Skip a header extension.
300
 *
301
 *  @param[in,out]  gb  the GetBit context
302
 */
303
static inline void skip_hdr_extension(GetBitContext *gb)
304
{
305
    int i, len;
306

    
307
    do {
308
        len = get_bits(gb, 8);
309
        for (i = 0; i < len; i++) skip_bits(gb, 8);
310
    } while(len);
311
}
312

    
313

    
314
/**
315
 *  Decode Indeo5 picture header.
316
 *
317
 *  @param[in,out]  ctx    ptr to the decoder context
318
 *  @param[in]      avctx  ptr to the AVCodecContext
319
 *  @return         result code: 0 = OK, -1 = error
320
 */
321
static int decode_pic_hdr(IVI5DecContext *ctx, AVCodecContext *avctx)
322
{
323
    if (get_bits(&ctx->gb, 5) != 0x1F) {
324
        av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
325
        return -1;
326
    }
327

    
328
    ctx->prev_frame_type = ctx->frame_type;
329
    ctx->frame_type      = get_bits(&ctx->gb, 3);
330
    if (ctx->frame_type >= 5) {
331
        av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
332
        return -1;
333
    }
334

    
335
    ctx->frame_num = get_bits(&ctx->gb, 8);
336

    
337
    if (ctx->frame_type == FRAMETYPE_INTRA) {
338
        if (decode_gop_header(ctx, avctx))
339
            return -1;
340
    }
341

    
342
    if (ctx->frame_type != FRAMETYPE_NULL) {
343
        ctx->frame_flags = get_bits(&ctx->gb, 8);
344

    
345
        ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
346

    
347
        ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
348

    
349
        /* skip unknown extension if any */
350
        if (ctx->frame_flags & 0x20)
351
            skip_hdr_extension(&ctx->gb); /* XXX: untested */
352

    
353
        /* decode macroblock huffman codebook */
354
        if (ff_ivi_dec_huff_desc(&ctx->gb, ctx->frame_flags & 0x40, IVI_MB_HUFF, &ctx->mb_vlc, avctx))
355
            return -1;
356

    
357
        skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
358
    }
359

    
360
    align_get_bits(&ctx->gb);
361

    
362
    return 0;
363
}
364

    
365

    
366
/**
367
 *  Decode Indeo5 band header.
368
 *
369
 *  @param[in,out]  ctx    ptr to the decoder context
370
 *  @param[in,out]  band   ptr to the band descriptor
371
 *  @param[in]      avctx  ptr to the AVCodecContext
372
 *  @return         result code: 0 = OK, -1 = error
373
 */
374
static int decode_band_hdr(IVI5DecContext *ctx, IVIBandDesc *band,
375
                           AVCodecContext *avctx)
376
{
377
    int         i;
378
    uint8_t     band_flags;
379

    
380
    band_flags = get_bits(&ctx->gb, 8);
381

    
382
    if (band_flags & 1) {
383
        band->is_empty = 1;
384
        return 0;
385
    }
386

    
387
    band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
388

    
389
    band->inherit_mv     = band_flags & 2;
390
    band->inherit_qdelta = band_flags & 8;
391
    band->qdelta_present = band_flags & 4;
392
    if (!band->qdelta_present) band->inherit_qdelta = 1;
393

    
394
    /* decode rvmap probability corrections if any */
395
    band->num_corr = 0; /* there are no corrections */
396
    if (band_flags & 0x10) {
397
        band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
398
        if (band->num_corr > 61) {
399
            av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
400
                   band->num_corr);
401
            return -1;
402
        }
403

    
404
        /* read correction pairs */
405
        for (i = 0; i < band->num_corr * 2; i++)
406
            band->corr[i] = get_bits(&ctx->gb, 8);
407
    }
408

    
409
    /* select appropriate rvmap table for this band */
410
    band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
411

    
412
    /* decode block huffman codebook */
413
    if (ff_ivi_dec_huff_desc(&ctx->gb, band_flags & 0x80, IVI_BLK_HUFF, &band->blk_vlc, avctx))
414
        return -1;
415

    
416
    band->checksum_present = get_bits1(&ctx->gb);
417
    if (band->checksum_present)
418
        band->checksum = get_bits(&ctx->gb, 16);
419

    
420
    band->glob_quant = get_bits(&ctx->gb, 5);
421

    
422
    /* skip unknown extension if any */
423
    if (band_flags & 0x20) { /* XXX: untested */
424
        align_get_bits(&ctx->gb);
425
        skip_hdr_extension(&ctx->gb);
426
    }
427

    
428
    align_get_bits(&ctx->gb);
429

    
430
    return 0;
431
}
432

    
433

    
434
/**
435
 *  Decode info (block type, cbp, quant delta, motion vector)
436
 *  for all macroblocks in the current tile.
437
 *
438
 *  @param[in,out]  ctx    ptr to the decoder context
439
 *  @param[in,out]  band   ptr to the band descriptor
440
 *  @param[in,out]  tile   ptr to the tile descriptor
441
 *  @param[in]      avctx  ptr to the AVCodecContext
442
 *  @return         result code: 0 = OK, -1 = error
443
 */
444
static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
445
                          IVITile *tile, AVCodecContext *avctx)
446
{
447
    int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
448
                mv_scale, blks_per_mb;
449
    IVIMbInfo   *mb, *ref_mb;
450
    int         row_offset = band->mb_size * band->pitch;
451

    
452
    mb     = tile->mbs;
453
    ref_mb = tile->ref_mbs;
454
    offs   = tile->ypos * band->pitch + tile->xpos;
455

    
456
    /* scale factor for motion vectors */
457
    mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
458
    mv_x = mv_y = 0;
459

    
460
    for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
461
        mb_offset = offs;
462

    
463
        for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
464
            mb->xpos     = x;
465
            mb->ypos     = y;
466
            mb->buf_offs = mb_offset;
467

    
468
            if (get_bits1(&ctx->gb)) {
469
                if (ctx->frame_type == FRAMETYPE_INTRA) {
470
                    av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
471
                    return -1;
472
                }
473
                mb->type = 1; /* empty macroblocks are always INTER */
474
                mb->cbp  = 0; /* all blocks are empty */
475

    
476
                mb->q_delta = 0;
477
                if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {
478
                    mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
479
                                           IVI_VLC_BITS, 1);
480
                    mb->q_delta = IVI_TOSIGNED(mb->q_delta);
481
                }
482

    
483
                mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
484
                if (band->inherit_mv){
485
                    /* motion vector inheritance */
486
                    if (mv_scale) {
487
                        mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
488
                        mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
489
                    } else {
490
                        mb->mv_x = ref_mb->mv_x;
491
                        mb->mv_y = ref_mb->mv_y;
492
                    }
493
                }
494
            } else {
495
                if (band->inherit_mv) {
496
                    mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
497
                } else if (ctx->frame_type == FRAMETYPE_INTRA) {
498
                    mb->type = 0; /* mb_type is always INTRA for intra-frames */
499
                } else {
500
                    mb->type = get_bits1(&ctx->gb);
501
                }
502

    
503
                blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
504
                mb->cbp = get_bits(&ctx->gb, blks_per_mb);
505

    
506
                mb->q_delta = 0;
507
                if (band->qdelta_present) {
508
                    if (band->inherit_qdelta) {
509
                        if (ref_mb) mb->q_delta = ref_mb->q_delta;
510
                    } else if (mb->cbp || (!band->plane && !band->band_num &&
511
                                           (ctx->frame_flags & 8))) {
512
                        mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
513
                                               IVI_VLC_BITS, 1);
514
                        mb->q_delta = IVI_TOSIGNED(mb->q_delta);
515
                    }
516
                }
517

    
518
                if (!mb->type) {
519
                    mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
520
                } else {
521
                    if (band->inherit_mv){
522
                        /* motion vector inheritance */
523
                        if (mv_scale) {
524
                            mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
525
                            mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
526
                        } else {
527
                            mb->mv_x = ref_mb->mv_x;
528
                            mb->mv_y = ref_mb->mv_y;
529
                        }
530
                    } else {
531
                        /* decode motion vector deltas */
532
                        mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
533
                                            IVI_VLC_BITS, 1);
534
                        mv_y += IVI_TOSIGNED(mv_delta);
535
                        mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
536
                                            IVI_VLC_BITS, 1);
537
                        mv_x += IVI_TOSIGNED(mv_delta);
538
                        mb->mv_x = mv_x;
539
                        mb->mv_y = mv_y;
540
                    }
541
                }
542
            }
543

    
544
            mb++;
545
            if (ref_mb)
546
                ref_mb++;
547
            mb_offset += band->mb_size;
548
        }
549

    
550
        offs += row_offset;
551
    }
552

    
553
    align_get_bits(&ctx->gb);
554

    
555
    return 0;
556
}
557

    
558

    
559
/**
560
 *  Decode an Indeo5 band.
561
 *
562
 *  @param[in,out]  ctx    ptr to the decoder context
563
 *  @param[in,out]  band   ptr to the band descriptor
564
 *  @param[in]      avctx  ptr to the AVCodecContext
565
 *  @return         result code: 0 = OK, -1 = error
566
 */
567
static int decode_band(IVI5DecContext *ctx, int plane_num,
568
                       IVIBandDesc *band, AVCodecContext *avctx)
569
{
570
    int         result, i, t, idx1, idx2, pos;
571
    IVITile     *tile;
572

    
573
    band->buf     = band->bufs[ctx->dst_buf];
574
    band->ref_buf = band->bufs[ctx->ref_buf];
575
    band->data_ptr = ctx->frame_data + (get_bits_count(&ctx->gb) >> 3);
576

    
577
    result = decode_band_hdr(ctx, band, avctx);
578
    if (result) {
579
        av_log(avctx, AV_LOG_ERROR, "Error while decoding band header: %d\n",
580
               result);
581
        return -1;
582
    }
583

    
584
    if (band->is_empty) {
585
        av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");
586
        return -1;
587
    }
588

    
589
    band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];
590

    
591
    /* apply corrections to the selected rvmap table if present */
592
    for (i = 0; i < band->num_corr; i++) {
593
        idx1 = band->corr[i*2];
594
        idx2 = band->corr[i*2+1];
595
        FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
596
        FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
597
    }
598

    
599
    pos = get_bits_count(&ctx->gb);
600

    
601
    for (t = 0; t < band->num_tiles; t++) {
602
        tile = &band->tiles[t];
603

    
604
        tile->is_empty = get_bits1(&ctx->gb);
605
        if (tile->is_empty) {
606
            ff_ivi_process_empty_tile(avctx, band, tile,
607
                                      (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
608
        } else {
609
            tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
610

    
611
            result = decode_mb_info(ctx, band, tile, avctx);
612
            if (result < 0)
613
                break;
614

    
615
            result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
616
            if (result < 0 || (get_bits_count(&ctx->gb) - pos) >> 3 != tile->data_size) {
617
                av_log(avctx, AV_LOG_ERROR, "Corrupted tile data encountered!\n");
618
                break;
619
            }
620
            pos += tile->data_size << 3; // skip to next tile
621
        }
622
    }
623

    
624
    /* restore the selected rvmap table by applying its corrections in reverse order */
625
    for (i = band->num_corr-1; i >= 0; i--) {
626
        idx1 = band->corr[i*2];
627
        idx2 = band->corr[i*2+1];
628
        FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
629
        FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
630
    }
631

    
632
#if IVI_DEBUG
633
    if (band->checksum_present) {
634
        uint16_t chksum = ivi_calc_band_checksum(band);
635
        if (chksum != band->checksum) {
636
            av_log(avctx, AV_LOG_ERROR,
637
                   "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",
638
                   band->plane, band->band_num, band->checksum, chksum);
639
        }
640
    }
641
#endif
642

    
643
    align_get_bits(&ctx->gb);
644

    
645
    return result;
646
}
647

    
648

    
649
/**
650
 *  Switch buffers.
651
 *
652
 *  @param[in,out] ctx  ptr to the decoder context
653
 */
654
static void switch_buffers(IVI5DecContext *ctx)
655
{
656
    switch (ctx->prev_frame_type) {
657
    case FRAMETYPE_INTRA:
658
    case FRAMETYPE_INTER:
659
        ctx->buf_switch ^= 1;
660
        ctx->dst_buf = ctx->buf_switch;
661
        ctx->ref_buf = ctx->buf_switch ^ 1;
662
        break;
663
    case FRAMETYPE_INTER_SCAL:
664
        if (!ctx->inter_scal) {
665
            ctx->ref2_buf   = 2;
666
            ctx->inter_scal = 1;
667
        }
668
        FFSWAP(int, ctx->dst_buf, ctx->ref2_buf);
669
        ctx->ref_buf = ctx->ref2_buf;
670
        break;
671
    case FRAMETYPE_INTER_NOREF:
672
        break;
673
    }
674

    
675
    switch (ctx->frame_type) {
676
    case FRAMETYPE_INTRA:
677
        ctx->buf_switch = 0;
678
        /* FALLTHROUGH */
679
    case FRAMETYPE_INTER:
680
        ctx->inter_scal = 0;
681
        ctx->dst_buf = ctx->buf_switch;
682
        ctx->ref_buf = ctx->buf_switch ^ 1;
683
        break;
684
    case FRAMETYPE_INTER_SCAL:
685
    case FRAMETYPE_INTER_NOREF:
686
    case FRAMETYPE_NULL:
687
        break;
688
    }
689
}
690

    
691

    
692
/**
693
 *  Initialize Indeo5 decoder.
694
 */
695
static av_cold int decode_init(AVCodecContext *avctx)
696
{
697
    IVI5DecContext  *ctx = avctx->priv_data;
698
    int             result;
699

    
700
    ff_ivi_init_static_vlc();
701

    
702
    /* copy rvmap tables in our context so we can apply changes to them */
703
    memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
704

    
705
    /* set the initial picture layout according to the basic profile:
706
       there is only one band per plane (no scalability), only one tile (no local decoding)
707
       and picture format = YVU9 */
708
    ctx->pic_conf.pic_width     = avctx->width;
709
    ctx->pic_conf.pic_height    = avctx->height;
710
    ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;
711
    ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
712
    ctx->pic_conf.tile_width    = avctx->width;
713
    ctx->pic_conf.tile_height   = avctx->height;
714
    ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;
715

    
716
    result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
717
    if (result) {
718
        av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
719
        return -1;
720
    }
721

    
722
    ctx->buf_switch = 0;
723
    ctx->inter_scal = 0;
724

    
725
    avctx->pix_fmt = PIX_FMT_YUV410P;
726

    
727
    return 0;
728
}
729

    
730

    
731
/**
732
 *  main decoder function
733
 */
734
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
735
                        AVPacket *avpkt)
736
{
737
    IVI5DecContext  *ctx = avctx->priv_data;
738
    const uint8_t   *buf = avpkt->data;
739
    int             buf_size = avpkt->size;
740
    int             result, p, b;
741

    
742
    init_get_bits(&ctx->gb, buf, buf_size * 8);
743
    ctx->frame_data = buf;
744
    ctx->frame_size = buf_size;
745

    
746
    result = decode_pic_hdr(ctx, avctx);
747
    if (result) {
748
        av_log(avctx, AV_LOG_ERROR,
749
               "Error while decoding picture header: %d\n", result);
750
        return -1;
751
    }
752

    
753
    if (ctx->gop_flags & IVI5_IS_PROTECTED) {
754
        av_log(avctx, AV_LOG_ERROR, "Password-protected clip!\n");
755
        return -1;
756
    }
757

    
758
    switch_buffers(ctx);
759

    
760
    //START_TIMER;
761

    
762
    if (ctx->frame_type != FRAMETYPE_NULL) {
763
        for (p = 0; p < 3; p++) {
764
            for (b = 0; b < ctx->planes[p].num_bands; b++) {
765
                result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);
766
                if (result) {
767
                    av_log(avctx, AV_LOG_ERROR,
768
                           "Error while decoding band: %d, plane: %d\n", b, p);
769
                    return -1;
770
                }
771
            }
772
        }
773
    }
774

    
775
    //STOP_TIMER("decode_planes");
776

    
777
    if (ctx->frame.data[0])
778
        avctx->release_buffer(avctx, &ctx->frame);
779

    
780
    ctx->frame.reference = 0;
781
    if (avctx->get_buffer(avctx, &ctx->frame) < 0) {
782
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
783
        return -1;
784
    }
785

    
786
    if (ctx->is_scalable) {
787
        ff_ivi_recompose53 (&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);
788
    } else {
789
        ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);
790
    }
791

    
792
    ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);
793
    ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);
794

    
795
    *data_size = sizeof(AVFrame);
796
    *(AVFrame*)data = ctx->frame;
797

    
798
    return buf_size;
799
}
800

    
801

    
802
/**
803
 *  Close Indeo5 decoder and clean up its context.
804
 */
805
static av_cold int decode_close(AVCodecContext *avctx)
806
{
807
    IVI5DecContext *ctx = avctx->priv_data;
808

    
809
    ff_ivi_free_buffers(&ctx->planes[0]);
810

    
811
    if (ctx->mb_vlc.cust_tab.table)
812
        free_vlc(&ctx->mb_vlc.cust_tab);
813

    
814
    if (ctx->frame.data[0])
815
        avctx->release_buffer(avctx, &ctx->frame);
816

    
817
    return 0;
818
}
819

    
820

    
821
AVCodec ff_indeo5_decoder = {
822
    .name           = "indeo5",
823
    .type           = AVMEDIA_TYPE_VIDEO,
824
    .id             = CODEC_ID_INDEO5,
825
    .priv_data_size = sizeof(IVI5DecContext),
826
    .init           = decode_init,
827
    .close          = decode_close,
828
    .decode         = decode_frame,
829
    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
830
};