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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 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.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; 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 libavcodec/indeo5.c
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             dst_buf;
61
    int             ref_buf;
62
    uint32_t        frame_size;      ///< frame size in bytes
63
    int             frame_type;
64
    int             prev_frame_type; ///< frame type of the previous frame
65
    int             frame_num;
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    uint32_t        pic_hdr_size;    ///< picture header size in bytes
67
    uint8_t         frame_flags;
68
    uint16_t        checksum;        ///< frame checksum
69

    
70
    int16_t         mb_huff_sel;     ///< MB huffman table selector
71
    IVIHuffDesc     mb_huff_desc;    ///< MB table descriptor associated with the selector above
72
    VLC             *mb_vlc;         ///< ptr to the vlc table for decoding macroblock data
73
    VLC             mb_vlc_cust;     ///< custom macroblock vlc table
74

    
75
    uint16_t        gop_hdr_size;
76
    uint8_t         gop_flags;
77
    int             is_scalable;
78
    uint32_t        lock_word;
79
    IVIPicConfig    pic_conf;
80
} IVI5DecContext;
81

    
82

    
83
/**
84
 *  Decodes Indeo5 GOP (Group of pictures) header.
85
 *  This header is present in key frames only.
86
 *  It defines parameters for all frames in a GOP.
87
 *
88
 *  @param ctx      [in,out] ptr to the decoder context
89
 *  @param avctx    [in] ptr to the AVCodecContext
90
 *  @return         result code: 0 = OK, -1 = error
91
 */
92
static int decode_gop_header(IVI5DecContext *ctx, AVCodecContext *avctx)
93
{
94
    int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size, 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          = ivi5_scans8x8[0];
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          = ivi5_scans8x8[1];
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          = ivi5_scans8x8[1];
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          = ivi5_scan4x4;
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
                band->quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
217
            } else {
218
                band->quant_mat = 5;
219
            }
220

    
221
            if (get_bits(&ctx->gb, 2)) {
222
                av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
223
                return -1;
224
            }
225
        }
226
    }
227

    
228
    /* copy chroma parameters into the 2nd chroma plane */
229
    for (i = 0; i < pic_conf.chroma_bands; i++) {
230
        band1 = &ctx->planes[1].bands[i];
231
        band2 = &ctx->planes[2].bands[i];
232

    
233
        band2->width         = band1->width;
234
        band2->height        = band1->height;
235
        band2->mb_size       = band1->mb_size;
236
        band2->blk_size      = band1->blk_size;
237
        band2->is_halfpel    = band1->is_halfpel;
238
        band2->quant_mat     = band1->quant_mat;
239
        band2->scan          = band1->scan;
240
        band2->inv_transform = band1->inv_transform;
241
        band2->dc_transform  = band1->dc_transform;
242
        band2->is_2d_trans   = band1->is_2d_trans;
243
    }
244

    
245
    /* reallocate internal structures if needed */
246
    if (blk_size_changed) {
247
        result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
248
                                   pic_conf.tile_height);
249
        if (result) {
250
            av_log(avctx, AV_LOG_ERROR,
251
                   "Couldn't reallocate internal structures!\n");
252
            return -1;
253
        }
254
    }
255

    
256
    if (ctx->gop_flags & 8) {
257
        if (get_bits(&ctx->gb, 3)) {
258
            av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
259
            return -1;
260
        }
261

    
262
        if (get_bits1(&ctx->gb))
263
            skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
264
    }
265

    
266
    align_get_bits(&ctx->gb);
267

    
268
    skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
269

    
270
    /* skip GOP extension if any */
271
    if (get_bits1(&ctx->gb)) {
272
        do {
273
            i = get_bits(&ctx->gb, 16);
274
        } while (i & 0x8000);
275
    }
276

    
277
    align_get_bits(&ctx->gb);
278

    
279
    return 0;
280
}
281

    
282

    
283
/**
284
 *  Skips a header extension.
285
 *
286
 *  @param gb   [in,out] the GetBit context
287
 */
288
static inline void skip_hdr_extension(GetBitContext *gb)
289
{
290
    int i, len;
291

    
292
    do {
293
        len = get_bits(gb, 8);
294
        for (i = 0; i < len; i++) skip_bits(gb, 8);
295
    } while(len);
296
}
297

    
298

    
299
/**
300
 *  Decodes Indeo5 picture header.
301
 *
302
 *  @param ctx      [in,out] ptr to the decoder context
303
 *  @param avctx    [in] ptr to the AVCodecContext
304
 *  @return         result code: 0 = OK, -1 = error
305
 */
306
static int decode_pic_hdr(IVI5DecContext *ctx, AVCodecContext *avctx)
307
{
308
    int         result;
309
    IVIHuffDesc new_huff;
310

    
311
    if (get_bits(&ctx->gb, 5) != 0x1F) {
312
        av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
313
        return -1;
314
    }
315

    
316
    ctx->prev_frame_type = ctx->frame_type;
317
    ctx->frame_type      = get_bits(&ctx->gb, 3);
318
    if (ctx->frame_type >= 5) {
319
        av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
320
        return -1;
321
    }
322

    
323
    ctx->frame_num = get_bits(&ctx->gb, 8);
324

    
325
    if (ctx->frame_type == FRAMETYPE_INTRA) {
326
        if (decode_gop_header(ctx, avctx))
327
            return -1;
328
    }
329

    
330
    if (ctx->frame_type != FRAMETYPE_NULL) {
331
        ctx->frame_flags = get_bits(&ctx->gb, 8);
332

    
333
        ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
334

    
335
        ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
336

    
337
        /* skip unknown extension if any */
338
        if (ctx->frame_flags & 0x20)
339
            skip_hdr_extension(&ctx->gb); /* XXX: untested */
340

    
341
        /* decode macroblock huffman codebook */
342
        if (ctx->frame_flags & 0x40) {
343
            ctx->mb_huff_sel = ff_ivi_dec_huff_desc(&ctx->gb, &new_huff);
344
            if (ctx->mb_huff_sel != 7) {
345
                ctx->mb_vlc = &ff_ivi_mb_vlc_tabs[ctx->mb_huff_sel];
346
            } else {
347
                if (ff_ivi_huff_desc_cmp(&new_huff, &ctx->mb_huff_desc)) {
348
                    ff_ivi_huff_desc_copy(&ctx->mb_huff_desc, &new_huff);
349

    
350
                    if (ctx->mb_vlc_cust.table)
351
                        free_vlc(&ctx->mb_vlc_cust);
352
                    result = ff_ivi_create_huff_from_desc(&ctx->mb_huff_desc,
353
                                                          &ctx->mb_vlc_cust, 0);
354
                    if (result) {
355
                        av_log(avctx, AV_LOG_ERROR, "Error while initializing custom macroblock vlc table!\n");
356
                        return -1;
357
                    }
358
                }
359
                ctx->mb_vlc = &ctx->mb_vlc_cust;
360
            }
361
        } else {
362
            ctx->mb_vlc = &ff_ivi_mb_vlc_tabs[7]; /* select the default macroblock huffman table */
363
        }
364

    
365
        skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
366
    }
367

    
368
    align_get_bits(&ctx->gb);
369

    
370
    return 0;
371
}
372

    
373

    
374
/**
375
 *  Decodes Indeo5 band header.
376
 *
377
 *  @param ctx      [in,out] ptr to the decoder context
378
 *  @param band     [in,out] ptr to the band descriptor
379
 *  @param avctx    [in] ptr to the AVCodecContext
380
 *  @return         result code: 0 = OK, -1 = error
381
 */
382
static int decode_band_hdr(IVI5DecContext *ctx, IVIBandDesc *band,
383
                           AVCodecContext *avctx)
384
{
385
    int         i, result;
386
    uint8_t     band_flags;
387
    IVIHuffDesc new_huff;
388

    
389
    band_flags = get_bits(&ctx->gb, 8);
390

    
391
    if (band_flags & 1) {
392
        band->is_empty = 1;
393
        return 0;
394
    }
395

    
396
    band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
397

    
398
    band->inherit_mv     = band_flags & 2;
399
    band->inherit_qdelta = band_flags & 8;
400
    band->qdelta_present = band_flags & 4;
401
    if (!band->qdelta_present) band->inherit_qdelta = 1;
402

    
403
    /* decode rvmap probability corrections if any */
404
    band->num_corr = 0; /* there are no corrections */
405
    if (band_flags & 0x10) {
406
        band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
407
        if (band->num_corr > 61) {
408
            av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
409
                   band->num_corr);
410
            return -1;
411
        }
412

    
413
        /* read correction pairs */
414
        for (i = 0; i < band->num_corr * 2; i++)
415
            band->corr[i] = get_bits(&ctx->gb, 8);
416
    }
417

    
418
    /* select appropriate rvmap table for this band */
419
    band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
420

    
421
    /* decode block huffman codebook */
422
    if (band_flags & 0x80) {
423
        band->huff_sel = ff_ivi_dec_huff_desc(&ctx->gb, &new_huff);
424
        if (band->huff_sel != 7) {
425
            band->blk_vlc = &ff_ivi_blk_vlc_tabs[band->huff_sel];
426
        } else {
427
            if (ff_ivi_huff_desc_cmp(&new_huff, &band->huff_desc)) {
428
                ff_ivi_huff_desc_copy(&band->huff_desc, &new_huff);
429

    
430
                if (band->blk_vlc_cust.table)
431
                    free_vlc(&band->blk_vlc_cust);
432
                result = ff_ivi_create_huff_from_desc(&band->huff_desc,
433
                                                      &band->blk_vlc_cust, 0);
434
                if (result) {
435
                    av_log(avctx, AV_LOG_ERROR, "Error while initializing custom block vlc table!\n");
436
                    return -1;
437
                }
438
            }
439
            band->blk_vlc = &band->blk_vlc_cust;
440
        }
441
    } else {
442
        band->blk_vlc = &ff_ivi_blk_vlc_tabs[7]; /* select the default macroblock huffman table */
443
    }
444

    
445
    band->checksum_present = get_bits1(&ctx->gb);
446
    if (band->checksum_present)
447
        band->checksum = get_bits(&ctx->gb, 16);
448

    
449
    band->glob_quant = get_bits(&ctx->gb, 5);
450

    
451
    /* skip unknown extension if any */
452
    if (band_flags & 0x20) { /* XXX: untested */
453
        align_get_bits(&ctx->gb);
454
        skip_hdr_extension(&ctx->gb);
455
    }
456

    
457
    align_get_bits(&ctx->gb);
458

    
459
    return 0;
460
}
461

    
462

    
463
/**
464
 *  Decodes info (block type, cbp, quant delta, motion vector)
465
 *  for all macroblocks in the current tile.
466
 *
467
 *  @param ctx      [in,out] ptr to the decoder context
468
 *  @param band     [in,out] ptr to the band descriptor
469
 *  @param tile     [in,out] ptr to the tile descriptor
470
 *  @param avctx    [in] ptr to the AVCodecContext
471
 *  @return         result code: 0 = OK, -1 = error
472
 */
473
static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
474
                          IVITile *tile, AVCodecContext *avctx)
475
{
476
    int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
477
                mv_scale, blks_per_mb;
478
    IVIMbInfo   *mb, *ref_mb;
479
    int         row_offset = band->mb_size * band->pitch;
480

    
481
    mb     = tile->mbs;
482
    ref_mb = tile->ref_mbs;
483
    offs   = tile->ypos * band->pitch + tile->xpos;
484

    
485
    /* scale factor for motion vectors */
486
    mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
487
    mv_x = mv_y = 0;
488

    
489
    for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
490
        mb_offset = offs;
491

    
492
        for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
493
            mb->xpos     = x;
494
            mb->ypos     = y;
495
            mb->buf_offs = mb_offset;
496

    
497
            if (get_bits1(&ctx->gb)) {
498
                if (ctx->frame_type == FRAMETYPE_INTRA) {
499
                    av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
500
                    return -1;
501
                }
502
                mb->type = 1; /* empty macroblocks are always INTER */
503
                mb->cbp  = 0; /* all blocks are empty */
504

    
505
                mb->q_delta = 0;
506
                if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {
507
                    mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
508
                                           IVI_VLC_BITS, 1);
509
                    mb->q_delta = IVI_TOSIGNED(mb->q_delta);
510
                }
511

    
512
                mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
513
                if (band->inherit_mv){
514
                    /* motion vector inheritance */
515
                    if (mv_scale) {
516
                        mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
517
                        mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
518
                    } else {
519
                        mb->mv_x = ref_mb->mv_x;
520
                        mb->mv_y = ref_mb->mv_y;
521
                    }
522
                }
523
            } else {
524
                if (band->inherit_mv) {
525
                    mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
526
                } else if (ctx->frame_type == FRAMETYPE_INTRA) {
527
                    mb->type = 0; /* mb_type is always INTRA for intra-frames */
528
                } else {
529
                    mb->type = get_bits1(&ctx->gb);
530
                }
531

    
532
                blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
533
                mb->cbp = get_bits(&ctx->gb, blks_per_mb);
534

    
535
                mb->q_delta = 0;
536
                if (band->qdelta_present) {
537
                    if (band->inherit_qdelta) {
538
                        if (ref_mb) mb->q_delta = ref_mb->q_delta;
539
                    } else if (mb->cbp || (!band->plane && !band->band_num &&
540
                                           (ctx->frame_flags & 8))) {
541
                        mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
542
                                               IVI_VLC_BITS, 1);
543
                        mb->q_delta = IVI_TOSIGNED(mb->q_delta);
544
                    }
545
                }
546

    
547
                if (!mb->type) {
548
                    mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
549
                } else {
550
                    if (band->inherit_mv){
551
                        /* motion vector inheritance */
552
                        if (mv_scale) {
553
                            mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
554
                            mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
555
                        } else {
556
                            mb->mv_x = ref_mb->mv_x;
557
                            mb->mv_y = ref_mb->mv_y;
558
                        }
559
                    } else {
560
                        /* decode motion vector deltas */
561
                        mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
562
                                            IVI_VLC_BITS, 1);
563
                        mv_y += IVI_TOSIGNED(mv_delta);
564
                        mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
565
                                            IVI_VLC_BITS, 1);
566
                        mv_x += IVI_TOSIGNED(mv_delta);
567
                        mb->mv_x = mv_x;
568
                        mb->mv_y = mv_y;
569
                    }
570
                }
571
            }
572

    
573
            mb++;
574
            if (ref_mb)
575
                ref_mb++;
576
            mb_offset += band->mb_size;
577
        }
578

    
579
        offs += row_offset;
580
    }
581

    
582
    align_get_bits(&ctx->gb);
583

    
584
    return 0;
585
}
586

    
587

    
588
/**
589
 *  Decodes an Indeo5 band.
590
 *
591
 *  @param ctx      [in,out] ptr to the decoder context
592
 *  @param band     [in,out] ptr to the band descriptor
593
 *  @param avctx    [in] ptr to the AVCodecContext
594
 *  @return         result code: 0 = OK, -1 = error
595
 */
596
static int decode_band(IVI5DecContext *ctx, int plane_num,
597
                       IVIBandDesc *band, AVCodecContext *avctx)
598
{
599
    int         result, i, t, idx1, idx2;
600
    IVITile     *tile;
601

    
602
    band->buf     = band->bufs[ctx->dst_buf];
603
    band->ref_buf = band->bufs[ctx->ref_buf];
604
    band->data_ptr = ctx->frame_data + (get_bits_count(&ctx->gb) >> 3);
605

    
606
    result = decode_band_hdr(ctx, band, avctx);
607
    if (result) {
608
        av_log(avctx, AV_LOG_ERROR, "Error while decoding band header: %d\n",
609
               result);
610
        return -1;
611
    }
612

    
613
    if (band->is_empty) {
614
        av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");
615
        return -1;
616
    }
617

    
618
    band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];
619

    
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]);
626
    }
627

    
628
    for (t = 0; t < band->num_tiles; t++) {
629
        tile = &band->tiles[t];
630

    
631
        tile->is_empty = get_bits1(&ctx->gb);
632
        if (tile->is_empty) {
633
            ff_ivi_process_empty_tile(avctx, band, tile,
634
                                      (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
635
            align_get_bits(&ctx->gb);
636
        } else {
637
            tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
638

    
639
            result = decode_mb_info(ctx, band, tile, avctx);
640
            if (result < 0)
641
                break;
642

    
643
            if (band->blk_size == 8) {
644
                band->intra_base  = &ivi5_base_quant_8x8_intra[band->quant_mat][0];
645
                band->inter_base  = &ivi5_base_quant_8x8_inter[band->quant_mat][0];
646
                band->intra_scale = &ivi5_scale_quant_8x8_intra[band->quant_mat][0];
647
                band->inter_scale = &ivi5_scale_quant_8x8_inter[band->quant_mat][0];
648
            } else {
649
                band->intra_base  = ivi5_base_quant_4x4_intra;
650
                band->inter_base  = ivi5_base_quant_4x4_inter;
651
                band->intra_scale = ivi5_scale_quant_4x4_intra;
652
                band->inter_scale = ivi5_scale_quant_4x4_inter;
653
            }
654

    
655
            result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
656
            if (result < 0) {
657
                av_log(avctx, AV_LOG_ERROR, "Corrupted blocks data encountered!\n");
658
                break;
659
            }
660
        }
661
    }
662

    
663
    /* restore the selected rvmap table by applying its corrections in reverse order */
664
    for (i = band->num_corr-1; i >= 0; i--) {
665
        idx1 = band->corr[i*2];
666
        idx2 = band->corr[i*2+1];
667
        FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
668
        FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
669
    }
670

    
671
#if IVI_DEBUG
672
    if (band->checksum_present) {
673
        uint16_t chksum = ivi_calc_band_checksum(band);
674
        if (chksum != band->checksum) {
675
            av_log(avctx, AV_LOG_ERROR,
676
                   "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",
677
                   band->plane, band->band_num, band->checksum, chksum);
678
        }
679
    }
680
#endif
681

    
682
    return result;
683
}
684

    
685

    
686
/**
687
 *  Switches buffers.
688
 *
689
 *  @param ctx      [in,out] ptr to the decoder context
690
 *  @param avctx    [in] ptr to the AVCodecContext
691
 */
692
static void switch_buffers(IVI5DecContext *ctx, AVCodecContext *avctx)
693
{
694
    switch (ctx->frame_type) {
695
    case FRAMETYPE_INTRA:
696
        ctx->buf_switch = 0;
697
        ctx->dst_buf    = 0;
698
        ctx->ref_buf    = 0;
699
        break;
700
    case FRAMETYPE_INTER:
701
        ctx->buf_switch &= 1;
702
        /* swap buffers only if there were no droppable frames */
703
        if (ctx->prev_frame_type != FRAMETYPE_INTER_NOREF &&
704
            ctx->prev_frame_type != FRAMETYPE_INTER_SCAL)
705
            ctx->buf_switch ^= 1;
706
        ctx->dst_buf = ctx->buf_switch;
707
        ctx->ref_buf = ctx->buf_switch ^ 1;
708
        break;
709
    case FRAMETYPE_INTER_SCAL:
710
        if (ctx->prev_frame_type == FRAMETYPE_INTER_NOREF)
711
            break;
712
        if (ctx->prev_frame_type != FRAMETYPE_INTER_SCAL) {
713
            ctx->buf_switch ^= 1;
714
            ctx->dst_buf     = ctx->buf_switch;
715
            ctx->ref_buf     = ctx->buf_switch ^ 1;
716
        } else {
717
            ctx->buf_switch ^= 2;
718
            ctx->dst_buf = 2;
719
            ctx->ref_buf = ctx->buf_switch & 1;
720
            if (!(ctx->buf_switch & 2))
721
                FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
722
        }
723
        break;
724
    case FRAMETYPE_INTER_NOREF:
725
        if (ctx->prev_frame_type == FRAMETYPE_INTER_SCAL) {
726
            ctx->buf_switch ^= 2;
727
            ctx->dst_buf = 2;
728
            ctx->ref_buf = ctx->buf_switch & 1;
729
            if (!(ctx->buf_switch & 2))
730
                FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
731
        } else {
732
            ctx->buf_switch ^= 1;
733
            ctx->dst_buf     =  ctx->buf_switch & 1;
734
            ctx->ref_buf     = (ctx->buf_switch & 1) ^ 1;
735
        }
736
        break;
737
    case FRAMETYPE_NULL:
738
        return;
739
    default:
740
        av_log(avctx, AV_LOG_ERROR, "unsupported frame type: %d\n", ctx->frame_type);
741
    }
742
}
743

    
744

    
745
/**
746
 *  Initializes Indeo5 decoder.
747
 */
748
static av_cold int decode_init(AVCodecContext *avctx)
749
{
750
    IVI5DecContext  *ctx = avctx->priv_data;
751
    int             result;
752

    
753
    ff_ivi_init_static_vlc();
754

    
755
    /* copy rvmap tables in our context so we can apply changes to them */
756
    memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
757

    
758
    /* set the initial picture layout according to the basic profile:
759
       there is only one band per plane (no scalability), only one tile (no local decoding)
760
       and picture format = YVU9 */
761
    ctx->pic_conf.pic_width     = avctx->width;
762
    ctx->pic_conf.pic_height    = avctx->height;
763
    ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;
764
    ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
765
    ctx->pic_conf.tile_width    = avctx->width;
766
    ctx->pic_conf.tile_height   = avctx->height;
767
    ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;
768

    
769
    result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
770
    if (result) {
771
        av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
772
        return -1;
773
    }
774

    
775
    avctx->pix_fmt = PIX_FMT_YUV410P;
776

    
777
    return 0;
778
}
779

    
780

    
781
/**
782
 *  main decoder function
783
 */
784
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
785
                        AVPacket *avpkt)
786
{
787
    IVI5DecContext  *ctx = avctx->priv_data;
788
    const uint8_t   *buf = avpkt->data;
789
    int             buf_size = avpkt->size;
790
    int             result, p, b;
791

    
792
    init_get_bits(&ctx->gb, buf, buf_size * 8);
793
    ctx->frame_data = buf;
794
    ctx->frame_size = buf_size;
795

    
796
    result = decode_pic_hdr(ctx, avctx);
797
    if (result) {
798
        av_log(avctx, AV_LOG_ERROR,
799
               "Error while decoding picture header: %d\n", result);
800
        return -1;
801
    }
802

    
803
    if (ctx->gop_flags & IVI5_IS_PROTECTED) {
804
        av_log(avctx, AV_LOG_ERROR, "Password-protected clip!\n");
805
        return -1;
806
    }
807

    
808
    switch_buffers(ctx, avctx);
809

    
810
    //START_TIMER;
811

    
812
    if (ctx->frame_type == FRAMETYPE_NULL) {
813
        ctx->frame_type = ctx->prev_frame_type;
814
    } else {
815
        for (p = 0; p < 3; p++) {
816
            for (b = 0; b < ctx->planes[p].num_bands; b++) {
817
                result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);
818
                if (result) {
819
                    av_log(avctx, AV_LOG_ERROR,
820
                           "Error while decoding band: %d, plane: %d\n", b, p);
821
                    return -1;
822
                }
823
            }
824
        }
825
    }
826

    
827
    //STOP_TIMER("decode_planes");
828

    
829
    if (ctx->frame.data[0])
830
        avctx->release_buffer(avctx, &ctx->frame);
831

    
832
    ctx->frame.reference = 0;
833
    if (avctx->get_buffer(avctx, &ctx->frame) < 0) {
834
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
835
        return -1;
836
    }
837

    
838
    if (ctx->is_scalable) {
839
        ff_ivi_recompose53 (&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);
840
    } else {
841
        ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);
842
    }
843

    
844
    ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);
845
    ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);
846

    
847
    *data_size = sizeof(AVFrame);
848
    *(AVFrame*)data = ctx->frame;
849

    
850
    return buf_size;
851
}
852

    
853

    
854
/**
855
 *  Closes Indeo5 decoder and cleans up its context.
856
 */
857
static av_cold int decode_close(AVCodecContext *avctx)
858
{
859
    IVI5DecContext *ctx = avctx->priv_data;
860

    
861
    ff_ivi_free_buffers(&ctx->planes[0]);
862

    
863
    if (ctx->mb_vlc_cust.table)
864
        free_vlc(&ctx->mb_vlc_cust);
865

    
866
    if (ctx->frame.data[0])
867
        avctx->release_buffer(avctx, &ctx->frame);
868

    
869
    return 0;
870
}
871

    
872

    
873
AVCodec indeo5_decoder = {
874
    .name           = "indeo5",
875
    .type           = CODEC_TYPE_VIDEO,
876
    .id             = CODEC_ID_INDEO5,
877
    .priv_data_size = sizeof(IVI5DecContext),
878
    .init           = decode_init,
879
    .close          = decode_close,
880
    .decode         = decode_frame,
881
    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
882
};