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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
 *
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 * 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 "ivi_dsp.h"
34
#include "ivi_common.h"
35
#include "indeo5data.h"
36

    
37
/**
38
 *  Indeo5 frame types.
39
 */
40
enum {
41
    FRAMETYPE_INTRA       = 0,
42
    FRAMETYPE_INTER       = 1,  ///< non-droppable P-frame
43
    FRAMETYPE_INTER_SCAL  = 2,  ///< droppable P-frame used in the scalability mode
44
    FRAMETYPE_INTER_NOREF = 3,  ///< droppable P-frame
45
    FRAMETYPE_NULL        = 4   ///< empty frame with no data
46
};
47

    
48
#define IVI5_PIC_SIZE_ESC       15
49

    
50
#define IVI5_IS_PROTECTED       0x20
51

    
52
typedef struct {
53
    GetBitContext   gb;
54
    AVFrame         frame;
55
    RVMapDesc       rvmap_tabs[9];   ///< local corrected copy of the static rvmap tables
56
    IVIPlaneDesc    planes[3];       ///< color planes
57
    const uint8_t   *frame_data;     ///< input frame data pointer
58
    int             buf_switch;      ///< used to switch between three buffers
59
    int             dst_buf;
60
    int             ref_buf;
61
    uint32_t        frame_size;      ///< frame size in bytes
62
    int             frame_type;
63
    int             prev_frame_type; ///< frame type of the previous frame
64
    int             frame_num;
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    uint32_t        pic_hdr_size;    ///< picture header size in bytes
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    uint8_t         frame_flags;
67
    uint16_t        checksum;        ///< frame checksum
68

    
69
    int16_t         mb_huff_sel;     ///< MB huffman table selector
70
    IVIHuffDesc     mb_huff_desc;    ///< MB table descriptor associated with the selector above
71
    VLC             *mb_vlc;         ///< ptr to the vlc table for decoding macroblock data
72
    VLC             mb_vlc_cust;     ///< custom macroblock vlc table
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
//! static vlc tables (initialized at startup)
82
static VLC mb_vlc_tabs [8];
83
static VLC blk_vlc_tabs[8];
84

    
85

    
86
/**
87
 *  Decodes Indeo5 GOP (Group of pictures) header.
88
 *  This header is present in key frames only.
89
 *  It defines parameters for all frames in a GOP.
90
 *
91
 *  @param ctx      [in,out] ptr to the decoder context
92
 *  @param avctx    [in] ptr to the AVCodecContext
93
 *  @return         result code: 0 = OK, -1 = error
94
 */
95
static int decode_gop_header(IVI5DecContext *ctx, AVCodecContext *avctx)
96
{
97
    int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size, blk_size_changed = 0;
98
    IVIBandDesc     *band, *band1, *band2;
99
    IVIPicConfig    pic_conf;
100

    
101
    ctx->gop_flags = get_bits(&ctx->gb, 8);
102

    
103
    ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;
104

    
105
    if (ctx->gop_flags & IVI5_IS_PROTECTED)
106
        ctx->lock_word = get_bits_long(&ctx->gb, 32);
107

    
108
    tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;
109
    if (tile_size > 256) {
110
        av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
111
        return -1;
112
    }
113

    
114
    /* decode number of wavelet bands */
115
    /* num_levels * 3 + 1 */
116
    pic_conf.luma_bands   = get_bits(&ctx->gb, 2) * 3 + 1;
117
    pic_conf.chroma_bands = get_bits1(&ctx->gb)   * 3 + 1;
118
    ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
119
    if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
120
        av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
121
               pic_conf.luma_bands, pic_conf.chroma_bands);
122
        return -1;
123
    }
124

    
125
    pic_size_indx = get_bits(&ctx->gb, 4);
126
    if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
127
        pic_conf.pic_height = get_bits(&ctx->gb, 13);
128
        pic_conf.pic_width  = get_bits(&ctx->gb, 13);
129
    } else {
130
        pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;
131
        pic_conf.pic_width  = ivi5_common_pic_sizes[pic_size_indx * 2    ] << 2;
132
    }
133

    
134
    if (ctx->gop_flags & 2) {
135
        av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n");
136
        return -1;
137
    }
138

    
139
    pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
140
    pic_conf.chroma_width  = (pic_conf.pic_width  + 3) >> 2;
141

    
142
    if (!tile_size) {
143
        pic_conf.tile_height = pic_conf.pic_height;
144
        pic_conf.tile_width  = pic_conf.pic_width;
145
    } else {
146
        pic_conf.tile_height = pic_conf.tile_width = tile_size;
147
    }
148

    
149
    /* check if picture layout was changed and reallocate buffers */
150
    if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
151
        result = ff_ivi_init_planes(ctx->planes, &pic_conf);
152
        if (result) {
153
            av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
154
            return -1;
155
        }
156
        ctx->pic_conf = pic_conf;
157
        blk_size_changed = 1; /* force reallocation of the internal structures */
158
    }
159

    
160
    for (p = 0; p <= 1; p++) {
161
        for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
162
            band = &ctx->planes[p].bands[i];
163

    
164
            band->is_halfpel = get_bits1(&ctx->gb);
165

    
166
            mb_size  = get_bits1(&ctx->gb);
167
            blk_size = 8 >> get_bits1(&ctx->gb);
168
            mb_size  = blk_size << !mb_size;
169

    
170
            blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
171
            if (blk_size_changed) {
172
                band->mb_size  = mb_size;
173
                band->blk_size = blk_size;
174
            }
175

    
176
            if (get_bits1(&ctx->gb)) {
177
                av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n");
178
                return -1;
179
            }
180

    
181
            /* select transform function and scan pattern according to plane and band number */
182
            switch ((p << 2) + i) {
183
            case 0:
184
                band->inv_transform = ff_ivi_inverse_slant_8x8;
185
                band->dc_transform  = ff_ivi_dc_slant_2d;
186
                band->scan          = ivi5_scans8x8[0];
187
                break;
188

    
189
            case 1:
190
                band->inv_transform = ff_ivi_row_slant8;
191
                band->dc_transform  = ff_ivi_dc_row_slant;
192
                band->scan          = ivi5_scans8x8[1];
193
                break;
194

    
195
            case 2:
196
                band->inv_transform = ff_ivi_col_slant8;
197
                band->dc_transform  = ff_ivi_dc_col_slant;
198
                band->scan          = ivi5_scans8x8[2];
199
                break;
200

    
201
            case 3:
202
                band->inv_transform = ff_ivi_put_pixels_8x8;
203
                band->dc_transform  = ff_ivi_put_dc_pixel_8x8;
204
                band->scan          = ivi5_scans8x8[2];
205
                break;
206

    
207
            case 4:
208
                band->inv_transform = ff_ivi_inverse_slant_4x4;
209
                band->dc_transform  = ff_ivi_dc_slant_2d;
210
                band->scan          = ivi5_scan4x4;
211
                break;
212
            }
213

    
214
            band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
215
                                band->inv_transform == ff_ivi_inverse_slant_4x4;
216

    
217
            /* select dequant matrix according to plane and band number */
218
            if (!p) {
219
                band->quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
220
            } else {
221
                band->quant_mat = 5;
222
            }
223

    
224
            if (get_bits(&ctx->gb, 2)) {
225
                av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
226
                return -1;
227
            }
228
        }
229
    }
230

    
231
    /* copy chroma parameters into the 2nd chroma plane */
232
    for (i = 0; i < pic_conf.chroma_bands; i++) {
233
        band1 = &ctx->planes[1].bands[i];
234
        band2 = &ctx->planes[2].bands[i];
235

    
236
        band2->width         = band1->width;
237
        band2->height        = band1->height;
238
        band2->mb_size       = band1->mb_size;
239
        band2->blk_size      = band1->blk_size;
240
        band2->is_halfpel    = band1->is_halfpel;
241
        band2->quant_mat     = band1->quant_mat;
242
        band2->scan          = band1->scan;
243
        band2->inv_transform = band1->inv_transform;
244
        band2->dc_transform  = band1->dc_transform;
245
        band2->is_2d_trans   = band1->is_2d_trans;
246
    }
247

    
248
    /* reallocate internal structures if needed */
249
    if (blk_size_changed) {
250
        result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
251
                                   pic_conf.tile_height);
252
        if (result) {
253
            av_log(avctx, AV_LOG_ERROR,
254
                   "Couldn't reallocate internal structures!\n");
255
            return -1;
256
        }
257
    }
258

    
259
    if (ctx->gop_flags & 8) {
260
        if (get_bits(&ctx->gb, 3)) {
261
            av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
262
            return -1;
263
        }
264

    
265
        if (get_bits1(&ctx->gb))
266
            skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
267
    }
268

    
269
    align_get_bits(&ctx->gb);
270

    
271
    skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
272

    
273
    /* skip GOP extension if any */
274
    if (get_bits1(&ctx->gb)) {
275
        do {
276
            i = get_bits(&ctx->gb, 16);
277
        } while (i & 0x8000);
278
    }
279

    
280
    align_get_bits(&ctx->gb);
281

    
282
    return 0;
283
}
284

    
285

    
286
/**
287
 *  Skips a header extension.
288
 *
289
 *  @param gb   [in,out] the GetBit context
290
 */
291
static inline void skip_hdr_extension(GetBitContext *gb)
292
{
293
    int i, len;
294

    
295
    do {
296
        len = get_bits(gb, 8);
297
        for (i = 0; i < len; i++) skip_bits(gb, 8);
298
    } while(len);
299
}
300

    
301

    
302
/**
303
 *  Decodes Indeo5 picture header.
304
 *
305
 *  @param ctx      [in,out] ptr to the decoder context
306
 *  @param avctx    [in] ptr to the AVCodecContext
307
 *  @return         result code: 0 = OK, -1 = error
308
 */
309
static int decode_pic_hdr(IVI5DecContext *ctx, AVCodecContext *avctx)
310
{
311
    int         result;
312
    IVIHuffDesc new_huff;
313

    
314
    if (get_bits(&ctx->gb, 5) != 0x1F) {
315
        av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
316
        return -1;
317
    }
318

    
319
    ctx->prev_frame_type = ctx->frame_type;
320
    ctx->frame_type      = get_bits(&ctx->gb, 3);
321
    if (ctx->frame_type >= 5) {
322
        av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
323
        return -1;
324
    }
325

    
326
    ctx->frame_num = get_bits(&ctx->gb, 8);
327

    
328
    if (ctx->frame_type == FRAMETYPE_INTRA) {
329
        if (decode_gop_header(ctx, avctx))
330
            return -1;
331
    }
332

    
333
    if (ctx->frame_type != FRAMETYPE_NULL) {
334
        ctx->frame_flags = get_bits(&ctx->gb, 8);
335

    
336
        ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
337

    
338
        ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
339

    
340
        /* skip unknown extension if any */
341
        if (ctx->frame_flags & 0x20)
342
            skip_hdr_extension(&ctx->gb); /* XXX: untested */
343

    
344
        /* decode macroblock huffman codebook */
345
        if (ctx->frame_flags & 0x40) {
346
            ctx->mb_huff_sel = ff_ivi_dec_huff_desc(&ctx->gb, &new_huff);
347
            if (ctx->mb_huff_sel != 7) {
348
                ctx->mb_vlc = &mb_vlc_tabs[ctx->mb_huff_sel];
349
            } else {
350
                if (ff_ivi_huff_desc_cmp(&new_huff, &ctx->mb_huff_desc)) {
351
                    ff_ivi_huff_desc_copy(&ctx->mb_huff_desc, &new_huff);
352

    
353
                    if (ctx->mb_vlc_cust.table)
354
                        free_vlc(&ctx->mb_vlc_cust);
355
                    result = ff_ivi_create_huff_from_desc(&ctx->mb_huff_desc,
356
                                                          &ctx->mb_vlc_cust, 0);
357
                    if (result) {
358
                        av_log(avctx, AV_LOG_ERROR, "Error while initializing custom macroblock vlc table!\n");
359
                        return -1;
360
                    }
361
                }
362
                ctx->mb_vlc = &ctx->mb_vlc_cust;
363
            }
364
        } else {
365
            ctx->mb_vlc = &mb_vlc_tabs[7]; /* select the default macroblock huffman table */
366
        }
367

    
368
        skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
369
    }
370

    
371
    align_get_bits(&ctx->gb);
372

    
373
    return 0;
374
}
375

    
376

    
377
/**
378
 *  Decodes Indeo5 band header.
379
 *
380
 *  @param ctx      [in,out] ptr to the decoder context
381
 *  @param band     [in,out] ptr to the band descriptor
382
 *  @param avctx    [in] ptr to the AVCodecContext
383
 *  @return         result code: 0 = OK, -1 = error
384
 */
385
static int decode_band_hdr(IVI5DecContext *ctx, IVIBandDesc *band,
386
                           AVCodecContext *avctx)
387
{
388
    int         i, result;
389
    uint8_t     band_flags;
390
    IVIHuffDesc new_huff;
391

    
392
    band_flags = get_bits(&ctx->gb, 8);
393

    
394
    if (band_flags & 1) {
395
        band->is_empty = 1;
396
        return 0;
397
    }
398

    
399
    band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
400

    
401
    band->inherit_mv     = band_flags & 2;
402
    band->inherit_qdelta = band_flags & 8;
403
    band->qdelta_present = band_flags & 4;
404
    if (!band->qdelta_present) band->inherit_qdelta = 1;
405

    
406
    /* decode rvmap probability corrections if any */
407
    band->num_corr = 0; /* there are no corrections */
408
    if (band_flags & 0x10) {
409
        band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
410
        if (band->num_corr > 61) {
411
            av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
412
                   band->num_corr);
413
            return -1;
414
        }
415

    
416
        /* read correction pairs */
417
        for (i = 0; i < band->num_corr * 2; i++)
418
            band->corr[i] = get_bits(&ctx->gb, 8);
419
    }
420

    
421
    /* select appropriate rvmap table for this band */
422
    band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
423

    
424
    /* decode block huffman codebook */
425
    if (band_flags & 0x80) {
426
        band->huff_sel = ff_ivi_dec_huff_desc(&ctx->gb, &new_huff);
427
        if (band->huff_sel != 7) {
428
            band->blk_vlc = &blk_vlc_tabs[band->huff_sel];
429
        } else {
430
            if (ff_ivi_huff_desc_cmp(&new_huff, &band->huff_desc)) {
431
                ff_ivi_huff_desc_copy(&band->huff_desc, &new_huff);
432

    
433
                if (band->blk_vlc_cust.table)
434
                    free_vlc(&band->blk_vlc_cust);
435
                result = ff_ivi_create_huff_from_desc(&band->huff_desc,
436
                                                      &band->blk_vlc_cust, 0);
437
                if (result) {
438
                    av_log(avctx, AV_LOG_ERROR, "Error while initializing custom block vlc table!\n");
439
                    return -1;
440
                }
441
            }
442
            band->blk_vlc = &band->blk_vlc_cust;
443
        }
444
    } else {
445
        band->blk_vlc = &blk_vlc_tabs[7]; /* select the default macroblock huffman table */
446
    }
447

    
448
    band->checksum_present = get_bits1(&ctx->gb);
449
    if (band->checksum_present)
450
        band->checksum = get_bits(&ctx->gb, 16);
451

    
452
    band->glob_quant = get_bits(&ctx->gb, 5);
453

    
454
    /* skip unknown extension if any */
455
    if (band_flags & 0x20) { /* XXX: untested */
456
        align_get_bits(&ctx->gb);
457
        skip_hdr_extension(&ctx->gb);
458
    }
459

    
460
    align_get_bits(&ctx->gb);
461

    
462
    return 0;
463
}
464

    
465

    
466
/**
467
 *  Decodes info (block type, cbp, quant delta, motion vector)
468
 *  for all macroblocks in the current tile.
469
 *
470
 *  @param ctx      [in,out] ptr to the decoder context
471
 *  @param band     [in,out] ptr to the band descriptor
472
 *  @param tile     [in,out] ptr to the tile descriptor
473
 *  @param avctx    [in] ptr to the AVCodecContext
474
 *  @return         result code: 0 = OK, -1 = error
475
 */
476
static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
477
                          IVITile *tile, AVCodecContext *avctx)
478
{
479
    int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
480
                mv_scale, blks_per_mb;
481
    IVIMbInfo   *mb, *ref_mb;
482
    int         row_offset = band->mb_size * band->pitch;
483

    
484
    mb     = tile->mbs;
485
    ref_mb = tile->ref_mbs;
486
    offs   = tile->ypos * band->pitch + tile->xpos;
487

    
488
    /* scale factor for motion vectors */
489
    mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
490
    mv_x = mv_y = 0;
491

    
492
    for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
493
        mb_offset = offs;
494

    
495
        for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
496
            mb->xpos     = x;
497
            mb->ypos     = y;
498
            mb->buf_offs = mb_offset;
499

    
500
            if (get_bits1(&ctx->gb)) {
501
                if (ctx->frame_type == FRAMETYPE_INTRA) {
502
                    av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
503
                    return -1;
504
                }
505
                mb->type = 1; /* empty macroblocks are always INTER */
506
                mb->cbp  = 0; /* all blocks are empty */
507

    
508
                mb->q_delta = 0;
509
                if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {
510
                    mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
511
                                           IVI_VLC_BITS, 1);
512
                    mb->q_delta = IVI_TOSIGNED(mb->q_delta);
513
                }
514

    
515
                mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
516
                if (band->inherit_mv){
517
                    /* motion vector inheritance */
518
                    if (mv_scale) {
519
                        mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
520
                        mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
521
                    } else {
522
                        mb->mv_x = ref_mb->mv_x;
523
                        mb->mv_y = ref_mb->mv_y;
524
                    }
525
                }
526
            } else {
527
                if (band->inherit_mv) {
528
                    mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
529
                } else if (ctx->frame_type == FRAMETYPE_INTRA) {
530
                    mb->type = 0; /* mb_type is always INTRA for intra-frames */
531
                } else {
532
                    mb->type = get_bits1(&ctx->gb);
533
                }
534

    
535
                blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
536
                mb->cbp = get_bits(&ctx->gb, blks_per_mb);
537

    
538
                mb->q_delta = 0;
539
                if (band->qdelta_present) {
540
                    if (band->inherit_qdelta) {
541
                        if (ref_mb) mb->q_delta = ref_mb->q_delta;
542
                    } else if (mb->cbp || (!band->plane && !band->band_num &&
543
                                           (ctx->frame_flags & 8))) {
544
                        mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
545
                                               IVI_VLC_BITS, 1);
546
                        mb->q_delta = IVI_TOSIGNED(mb->q_delta);
547
                    }
548
                }
549

    
550
                if (!mb->type) {
551
                    mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
552
                } else {
553
                    if (band->inherit_mv){
554
                        /* motion vector inheritance */
555
                        if (mv_scale) {
556
                            mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
557
                            mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
558
                        } else {
559
                            mb->mv_x = ref_mb->mv_x;
560
                            mb->mv_y = ref_mb->mv_y;
561
                        }
562
                    } else {
563
                        /* decode motion vector deltas */
564
                        mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
565
                                            IVI_VLC_BITS, 1);
566
                        mv_y += IVI_TOSIGNED(mv_delta);
567
                        mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc->table,
568
                                            IVI_VLC_BITS, 1);
569
                        mv_x += IVI_TOSIGNED(mv_delta);
570
                        mb->mv_x = mv_x;
571
                        mb->mv_y = mv_y;
572
                    }
573
                }
574
            }
575

    
576
            mb++;
577
            if (ref_mb)
578
                ref_mb++;
579
            mb_offset += band->mb_size;
580
        }
581

    
582
        offs += row_offset;
583
    }
584

    
585
    align_get_bits(&ctx->gb);
586

    
587
    return 0;
588
}
589

    
590

    
591
/**
592
 *  Decodes an Indeo5 band.
593
 *
594
 *  @param ctx      [in,out] ptr to the decoder context
595
 *  @param band     [in,out] ptr to the band descriptor
596
 *  @param avctx    [in] ptr to the AVCodecContext
597
 *  @return         result code: 0 = OK, -1 = error
598
 */
599
static int decode_band(IVI5DecContext *ctx, int plane_num,
600
                       IVIBandDesc *band, AVCodecContext *avctx)
601
{
602
    int         result, i, t, idx1, idx2;
603
    IVITile     *tile;
604
    uint16_t    chksum;
605

    
606
    band->buf     = band->bufs[ctx->dst_buf];
607
    band->ref_buf = band->bufs[ctx->ref_buf];
608
    band->data_ptr = ctx->frame_data + (get_bits_count(&ctx->gb) >> 3);
609

    
610
    result = decode_band_hdr(ctx, band, avctx);
611
    if (result) {
612
        av_log(avctx, AV_LOG_ERROR, "Error while decoding band header: %d\n",
613
               result);
614
        return -1;
615
    }
616

    
617
    if (band->is_empty) {
618
        av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");
619
        return -1;
620
    }
621

    
622
    band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];
623

    
624
    /* apply corrections to the selected rvmap table if present */
625
    for (i = 0; i < band->num_corr; 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
    for (t = 0; t < band->num_tiles; t++) {
633
        tile = &band->tiles[t];
634

    
635
        tile->is_empty = get_bits1(&ctx->gb);
636
        if (tile->is_empty) {
637
            ff_ivi_process_empty_tile(avctx, band, tile,
638
                                      (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
639
            align_get_bits(&ctx->gb);
640
        } else {
641
            tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
642

    
643
            result = decode_mb_info(ctx, band, tile, avctx);
644
            if (result < 0)
645
                break;
646

    
647
            if (band->blk_size == 8) {
648
                band->intra_base  = &ivi5_base_quant_8x8_intra[band->quant_mat][0];
649
                band->inter_base  = &ivi5_base_quant_8x8_inter[band->quant_mat][0];
650
                band->intra_scale = &ivi5_scale_quant_8x8_intra[band->quant_mat][0];
651
                band->inter_scale = &ivi5_scale_quant_8x8_inter[band->quant_mat][0];
652
            } else {
653
                band->intra_base  = ivi5_base_quant_4x4_intra;
654
                band->inter_base  = ivi5_base_quant_4x4_inter;
655
                band->intra_scale = ivi5_scale_quant_4x4_intra;
656
                band->inter_scale = ivi5_scale_quant_4x4_inter;
657
            }
658

    
659
            result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
660
            if (result < 0) {
661
                av_log(avctx, AV_LOG_ERROR, "Corrupted blocks data encountered!\n");
662
                break;
663
            }
664
        }
665
    }
666

    
667
    /* restore the selected rvmap table by applying its corrections in reverse order */
668
    for (i = band->num_corr-1; i >= 0; i--) {
669
        idx1 = band->corr[i*2];
670
        idx2 = band->corr[i*2+1];
671
        FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
672
        FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
673
    }
674

    
675
    if (IVI_DEBUG && band->checksum_present) {
676
        chksum = ivi_calc_band_checksum(band);
677
        if (chksum != band->checksum) {
678
            av_log(avctx, AV_LOG_ERROR,
679
                   "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",
680
                   band->plane, band->band_num, band->checksum, chksum);
681
        }
682
    }
683

    
684
    return result;
685
}
686

    
687

    
688
/**
689
 *  Switches buffers.
690
 *
691
 *  @param ctx      [in,out] ptr to the decoder context
692
 *  @param avctx    [in] ptr to the AVCodecContext
693
 */
694
static void switch_buffers(IVI5DecContext *ctx, AVCodecContext *avctx)
695
{
696
    switch (ctx->frame_type) {
697
    case FRAMETYPE_INTRA:
698
        ctx->buf_switch = 0;
699
        ctx->dst_buf    = 0;
700
        ctx->ref_buf    = 0;
701
        break;
702
    case FRAMETYPE_INTER:
703
        ctx->buf_switch &= 1;
704
        /* swap buffers only if there were no droppable frames */
705
        if (ctx->prev_frame_type != FRAMETYPE_INTER_NOREF &&
706
            ctx->prev_frame_type != FRAMETYPE_INTER_SCAL)
707
            ctx->buf_switch ^= 1;
708
        ctx->dst_buf = ctx->buf_switch;
709
        ctx->ref_buf = ctx->buf_switch ^ 1;
710
        break;
711
    case FRAMETYPE_INTER_SCAL:
712
        if (ctx->prev_frame_type == FRAMETYPE_INTER_NOREF)
713
            break;
714
        if (ctx->prev_frame_type != FRAMETYPE_INTER_SCAL) {
715
            ctx->buf_switch ^= 1;
716
            ctx->dst_buf     = ctx->buf_switch;
717
            ctx->ref_buf     = ctx->buf_switch ^ 1;
718
        } else {
719
            ctx->buf_switch ^= 2;
720
            ctx->dst_buf = 2;
721
            ctx->ref_buf = ctx->buf_switch & 1;
722
            if (!(ctx->buf_switch & 2))
723
                FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
724
        }
725
        break;
726
    case FRAMETYPE_INTER_NOREF:
727
        if (ctx->prev_frame_type == FRAMETYPE_INTER_SCAL) {
728
            ctx->buf_switch ^= 2;
729
            ctx->dst_buf = 2;
730
            ctx->ref_buf = ctx->buf_switch & 1;
731
            if (!(ctx->buf_switch & 2))
732
                FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
733
        } else {
734
            ctx->buf_switch ^= 1;
735
            ctx->dst_buf     =  ctx->buf_switch & 1;
736
            ctx->ref_buf     = (ctx->buf_switch & 1) ^ 1;
737
        }
738
        break;
739
    case FRAMETYPE_NULL:
740
        return;
741
    default:
742
        av_log(avctx, AV_LOG_ERROR, "unsupported frame type: %d\n", ctx->frame_type);
743
    }
744
}
745

    
746

    
747
/**
748
 *  Initializes Indeo5 decoder.
749
 */
750
static av_cold int decode_init(AVCodecContext *avctx)
751
{
752
    IVI5DecContext  *ctx = avctx->priv_data;
753
    int             i, result;
754

    
755
    /* initialize static vlc tables for macroblock/block signals */
756
    for (i = 0; i < 8; i++) {
757
        ff_ivi_create_huff_from_desc(&ff_ivi_mb_huff_desc[i],  &mb_vlc_tabs[i],  1);
758
        ff_ivi_create_huff_from_desc(&ff_ivi_blk_huff_desc[i], &blk_vlc_tabs[i], 1);
759
    }
760

    
761
    /* copy rvmap tables in our context so we can apply changes to them */
762
    memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
763

    
764
    /* set the initial picture layout according to the basic profile:
765
       there is only one band per plane (no scalability), only one tile (no local decoding)
766
       and picture format = YVU9 */
767
    ctx->pic_conf.pic_width     = avctx->width;
768
    ctx->pic_conf.pic_height    = avctx->height;
769
    ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;
770
    ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
771
    ctx->pic_conf.tile_width    = avctx->width;
772
    ctx->pic_conf.tile_height   = avctx->height;
773
    ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;
774

    
775
    result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
776
    if (result) {
777
        av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
778
        return -1;
779
    }
780

    
781
    avctx->pix_fmt = PIX_FMT_YUV410P;
782

    
783
    return 0;
784
}
785

    
786

    
787
/**
788
 *  main decoder function
789
 */
790
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
791
                        AVPacket *avpkt)
792
{
793
    IVI5DecContext  *ctx = avctx->priv_data;
794
    const uint8_t   *buf = avpkt->data;
795
    int             buf_size = avpkt->size;
796
    int             result, p, b;
797

    
798
    init_get_bits(&ctx->gb, buf, buf_size * 8);
799
    ctx->frame_data = buf;
800
    ctx->frame_size = buf_size;
801

    
802
    result = decode_pic_hdr(ctx, avctx);
803
    if (result) {
804
        av_log(avctx, AV_LOG_ERROR,
805
               "Error while decoding picture header: %d\n", result);
806
        return -1;
807
    }
808

    
809
    if (ctx->gop_flags & IVI5_IS_PROTECTED) {
810
        av_log(avctx, AV_LOG_ERROR, "Password-protected clip!\n");
811
        return -1;
812
    }
813

    
814
    switch_buffers(ctx, avctx);
815

    
816
    //START_TIMER;
817

    
818
    if (ctx->frame_type == FRAMETYPE_NULL) {
819
        ctx->frame_type = ctx->prev_frame_type;
820
    } else {
821
        for (p = 0; p < 3; p++) {
822
            for (b = 0; b < ctx->planes[p].num_bands; b++) {
823
                result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);
824
                if (result) {
825
                    av_log(avctx, AV_LOG_ERROR,
826
                           "Error while decoding band: %d, plane: %d\n", b, p);
827
                    return -1;
828
                }
829
            }
830
        }
831
    }
832

    
833
    //STOP_TIMER("decode_planes");
834

    
835
    if (ctx->frame.data[0])
836
        avctx->release_buffer(avctx, &ctx->frame);
837

    
838
    ctx->frame.reference = 0;
839
    if (avctx->get_buffer(avctx, &ctx->frame) < 0) {
840
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
841
        return -1;
842
    }
843

    
844
    if (ctx->is_scalable) {
845
        ff_ivi_recompose53 (&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);
846
    } else {
847
        ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);
848
    }
849

    
850
    ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);
851
    ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);
852

    
853
    *data_size = sizeof(AVFrame);
854
    *(AVFrame*)data = ctx->frame;
855

    
856
    return buf_size;
857
}
858

    
859

    
860
/**
861
 *  Closes Indeo5 decoder and cleans up its context.
862
 */
863
static av_cold int decode_close(AVCodecContext *avctx)
864
{
865
    IVI5DecContext *ctx = avctx->priv_data;
866

    
867
    ff_ivi_free_buffers(&ctx->planes[0]);
868

    
869
    if (ctx->frame.data[0])
870
        avctx->release_buffer(avctx, &ctx->frame);
871

    
872
    return 0;
873
}
874

    
875

    
876
AVCodec indeo5_decoder = {
877
    .name           = "indeo5",
878
    .type           = CODEC_TYPE_VIDEO,
879
    .id             = CODEC_ID_INDEO5,
880
    .priv_data_size = sizeof(IVI5DecContext),
881
    .init           = decode_init,
882
    .close          = decode_close,
883
    .decode         = decode_frame,
884
    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
885
};