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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
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 */
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;         ///< buffer index for the currently decoded frame
61
    int             ref_buf;         ///< inter frame reference buffer index
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
    IVIHuffTab      mb_vlc;          ///< vlc table for decoding macroblock data
71

    
72
    uint16_t        gop_hdr_size;
73
    uint8_t         gop_flags;
74
    int             is_scalable;
75
    uint32_t        lock_word;
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    IVIPicConfig    pic_conf;
77
} IVI5DecContext;
78

    
79

    
80
/**
81
 *  Decodes Indeo5 GOP (Group of pictures) header.
82
 *  This header is present in key frames only.
83
 *  It defines parameters for all frames in a GOP.
84
 *
85
 *  @param ctx      [in,out] ptr to the decoder context
86
 *  @param avctx    [in] ptr to the AVCodecContext
87
 *  @return         result code: 0 = OK, -1 = error
88
 */
89
static int decode_gop_header(IVI5DecContext *ctx, AVCodecContext *avctx)
90
{
91
    int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size, blk_size_changed = 0;
92
    IVIBandDesc     *band, *band1, *band2;
93
    IVIPicConfig    pic_conf;
94

    
95
    ctx->gop_flags = get_bits(&ctx->gb, 8);
96

    
97
    ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;
98

    
99
    if (ctx->gop_flags & IVI5_IS_PROTECTED)
100
        ctx->lock_word = get_bits_long(&ctx->gb, 32);
101

    
102
    tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;
103
    if (tile_size > 256) {
104
        av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
105
        return -1;
106
    }
107

    
108
    /* decode number of wavelet bands */
109
    /* num_levels * 3 + 1 */
110
    pic_conf.luma_bands   = get_bits(&ctx->gb, 2) * 3 + 1;
111
    pic_conf.chroma_bands = get_bits1(&ctx->gb)   * 3 + 1;
112
    ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
113
    if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
114
        av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
115
               pic_conf.luma_bands, pic_conf.chroma_bands);
116
        return -1;
117
    }
118

    
119
    pic_size_indx = get_bits(&ctx->gb, 4);
120
    if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
121
        pic_conf.pic_height = get_bits(&ctx->gb, 13);
122
        pic_conf.pic_width  = get_bits(&ctx->gb, 13);
123
    } else {
124
        pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;
125
        pic_conf.pic_width  = ivi5_common_pic_sizes[pic_size_indx * 2    ] << 2;
126
    }
127

    
128
    if (ctx->gop_flags & 2) {
129
        av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n");
130
        return -1;
131
    }
132

    
133
    pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
134
    pic_conf.chroma_width  = (pic_conf.pic_width  + 3) >> 2;
135

    
136
    if (!tile_size) {
137
        pic_conf.tile_height = pic_conf.pic_height;
138
        pic_conf.tile_width  = pic_conf.pic_width;
139
    } else {
140
        pic_conf.tile_height = pic_conf.tile_width = tile_size;
141
    }
142

    
143
    /* check if picture layout was changed and reallocate buffers */
144
    if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
145
        result = ff_ivi_init_planes(ctx->planes, &pic_conf);
146
        if (result) {
147
            av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
148
            return -1;
149
        }
150
        ctx->pic_conf = pic_conf;
151
        blk_size_changed = 1; /* force reallocation of the internal structures */
152
    }
153

    
154
    for (p = 0; p <= 1; p++) {
155
        for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
156
            band = &ctx->planes[p].bands[i];
157

    
158
            band->is_halfpel = get_bits1(&ctx->gb);
159

    
160
            mb_size  = get_bits1(&ctx->gb);
161
            blk_size = 8 >> get_bits1(&ctx->gb);
162
            mb_size  = blk_size << !mb_size;
163

    
164
            blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
165
            if (blk_size_changed) {
166
                band->mb_size  = mb_size;
167
                band->blk_size = blk_size;
168
            }
169

    
170
            if (get_bits1(&ctx->gb)) {
171
                av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n");
172
                return -1;
173
            }
174

    
175
            /* select transform function and scan pattern according to plane and band number */
176
            switch ((p << 2) + i) {
177
            case 0:
178
                band->inv_transform = ff_ivi_inverse_slant_8x8;
179
                band->dc_transform  = ff_ivi_dc_slant_2d;
180
                band->scan          = ff_zigzag_direct;
181
                break;
182

    
183
            case 1:
184
                band->inv_transform = ff_ivi_row_slant8;
185
                band->dc_transform  = ff_ivi_dc_row_slant;
186
                band->scan          = ivi5_scans8x8[0];
187
                break;
188

    
189
            case 2:
190
                band->inv_transform = ff_ivi_col_slant8;
191
                band->dc_transform  = ff_ivi_dc_col_slant;
192
                band->scan          = ivi5_scans8x8[1];
193
                break;
194

    
195
            case 3:
196
                band->inv_transform = ff_ivi_put_pixels_8x8;
197
                band->dc_transform  = ff_ivi_put_dc_pixel_8x8;
198
                band->scan          = ivi5_scans8x8[1];
199
                break;
200

    
201
            case 4:
202
                band->inv_transform = ff_ivi_inverse_slant_4x4;
203
                band->dc_transform  = ff_ivi_dc_slant_2d;
204
                band->scan          = ivi5_scan4x4;
205
                break;
206
            }
207

    
208
            band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
209
                                band->inv_transform == ff_ivi_inverse_slant_4x4;
210

    
211
            /* select dequant matrix according to plane and band number */
212
            if (!p) {
213
                band->quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
214
            } else {
215
                band->quant_mat = 5;
216
            }
217

    
218
            if (get_bits(&ctx->gb, 2)) {
219
                av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
220
                return -1;
221
            }
222
        }
223
    }
224

    
225
    /* copy chroma parameters into the 2nd chroma plane */
226
    for (i = 0; i < pic_conf.chroma_bands; i++) {
227
        band1 = &ctx->planes[1].bands[i];
228
        band2 = &ctx->planes[2].bands[i];
229

    
230
        band2->width         = band1->width;
231
        band2->height        = band1->height;
232
        band2->mb_size       = band1->mb_size;
233
        band2->blk_size      = band1->blk_size;
234
        band2->is_halfpel    = band1->is_halfpel;
235
        band2->quant_mat     = band1->quant_mat;
236
        band2->scan          = band1->scan;
237
        band2->inv_transform = band1->inv_transform;
238
        band2->dc_transform  = band1->dc_transform;
239
        band2->is_2d_trans   = band1->is_2d_trans;
240
    }
241

    
242
    /* reallocate internal structures if needed */
243
    if (blk_size_changed) {
244
        result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
245
                                   pic_conf.tile_height);
246
        if (result) {
247
            av_log(avctx, AV_LOG_ERROR,
248
                   "Couldn't reallocate internal structures!\n");
249
            return -1;
250
        }
251
    }
252

    
253
    if (ctx->gop_flags & 8) {
254
        if (get_bits(&ctx->gb, 3)) {
255
            av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
256
            return -1;
257
        }
258

    
259
        if (get_bits1(&ctx->gb))
260
            skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
261
    }
262

    
263
    align_get_bits(&ctx->gb);
264

    
265
    skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
266

    
267
    /* skip GOP extension if any */
268
    if (get_bits1(&ctx->gb)) {
269
        do {
270
            i = get_bits(&ctx->gb, 16);
271
        } while (i & 0x8000);
272
    }
273

    
274
    align_get_bits(&ctx->gb);
275

    
276
    return 0;
277
}
278

    
279

    
280
/**
281
 *  Skips a header extension.
282
 *
283
 *  @param gb   [in,out] the GetBit context
284
 */
285
static inline void skip_hdr_extension(GetBitContext *gb)
286
{
287
    int i, len;
288

    
289
    do {
290
        len = get_bits(gb, 8);
291
        for (i = 0; i < len; i++) skip_bits(gb, 8);
292
    } while(len);
293
}
294

    
295

    
296
/**
297
 *  Decodes Indeo5 picture header.
298
 *
299
 *  @param ctx      [in,out] ptr to the decoder context
300
 *  @param avctx    [in] ptr to the AVCodecContext
301
 *  @return         result code: 0 = OK, -1 = error
302
 */
303
static int decode_pic_hdr(IVI5DecContext *ctx, AVCodecContext *avctx)
304
{
305
    if (get_bits(&ctx->gb, 5) != 0x1F) {
306
        av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
307
        return -1;
308
    }
309

    
310
    ctx->prev_frame_type = ctx->frame_type;
311
    ctx->frame_type      = get_bits(&ctx->gb, 3);
312
    if (ctx->frame_type >= 5) {
313
        av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
314
        return -1;
315
    }
316

    
317
    ctx->frame_num = get_bits(&ctx->gb, 8);
318

    
319
    if (ctx->frame_type == FRAMETYPE_INTRA) {
320
        if (decode_gop_header(ctx, avctx))
321
            return -1;
322
    }
323

    
324
    if (ctx->frame_type != FRAMETYPE_NULL) {
325
        ctx->frame_flags = get_bits(&ctx->gb, 8);
326

    
327
        ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
328

    
329
        ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
330

    
331
        /* skip unknown extension if any */
332
        if (ctx->frame_flags & 0x20)
333
            skip_hdr_extension(&ctx->gb); /* XXX: untested */
334

    
335
        /* decode macroblock huffman codebook */
336
        if (ff_ivi_dec_huff_desc(&ctx->gb, ctx->frame_flags & 0x40, IVI_MB_HUFF, &ctx->mb_vlc, avctx))
337
            return -1;
338

    
339
        skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
340
    }
341

    
342
    align_get_bits(&ctx->gb);
343

    
344
    return 0;
345
}
346

    
347

    
348
/**
349
 *  Decodes Indeo5 band header.
350
 *
351
 *  @param ctx      [in,out] ptr to the decoder context
352
 *  @param band     [in,out] ptr to the band descriptor
353
 *  @param avctx    [in] ptr to the AVCodecContext
354
 *  @return         result code: 0 = OK, -1 = error
355
 */
356
static int decode_band_hdr(IVI5DecContext *ctx, IVIBandDesc *band,
357
                           AVCodecContext *avctx)
358
{
359
    int         i;
360
    uint8_t     band_flags;
361

    
362
    band_flags = get_bits(&ctx->gb, 8);
363

    
364
    if (band_flags & 1) {
365
        band->is_empty = 1;
366
        return 0;
367
    }
368

    
369
    band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
370

    
371
    band->inherit_mv     = band_flags & 2;
372
    band->inherit_qdelta = band_flags & 8;
373
    band->qdelta_present = band_flags & 4;
374
    if (!band->qdelta_present) band->inherit_qdelta = 1;
375

    
376
    /* decode rvmap probability corrections if any */
377
    band->num_corr = 0; /* there are no corrections */
378
    if (band_flags & 0x10) {
379
        band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
380
        if (band->num_corr > 61) {
381
            av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
382
                   band->num_corr);
383
            return -1;
384
        }
385

    
386
        /* read correction pairs */
387
        for (i = 0; i < band->num_corr * 2; i++)
388
            band->corr[i] = get_bits(&ctx->gb, 8);
389
    }
390

    
391
    /* select appropriate rvmap table for this band */
392
    band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
393

    
394
    /* decode block huffman codebook */
395
    if (ff_ivi_dec_huff_desc(&ctx->gb, band_flags & 0x80, IVI_BLK_HUFF, &band->blk_vlc, avctx))
396
        return -1;
397

    
398
    band->checksum_present = get_bits1(&ctx->gb);
399
    if (band->checksum_present)
400
        band->checksum = get_bits(&ctx->gb, 16);
401

    
402
    band->glob_quant = get_bits(&ctx->gb, 5);
403

    
404
    /* skip unknown extension if any */
405
    if (band_flags & 0x20) { /* XXX: untested */
406
        align_get_bits(&ctx->gb);
407
        skip_hdr_extension(&ctx->gb);
408
    }
409

    
410
    align_get_bits(&ctx->gb);
411

    
412
    return 0;
413
}
414

    
415

    
416
/**
417
 *  Decodes info (block type, cbp, quant delta, motion vector)
418
 *  for all macroblocks in the current tile.
419
 *
420
 *  @param ctx      [in,out] ptr to the decoder context
421
 *  @param band     [in,out] ptr to the band descriptor
422
 *  @param tile     [in,out] ptr to the tile descriptor
423
 *  @param avctx    [in] ptr to the AVCodecContext
424
 *  @return         result code: 0 = OK, -1 = error
425
 */
426
static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
427
                          IVITile *tile, AVCodecContext *avctx)
428
{
429
    int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
430
                mv_scale, blks_per_mb;
431
    IVIMbInfo   *mb, *ref_mb;
432
    int         row_offset = band->mb_size * band->pitch;
433

    
434
    mb     = tile->mbs;
435
    ref_mb = tile->ref_mbs;
436
    offs   = tile->ypos * band->pitch + tile->xpos;
437

    
438
    /* scale factor for motion vectors */
439
    mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
440
    mv_x = mv_y = 0;
441

    
442
    for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
443
        mb_offset = offs;
444

    
445
        for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
446
            mb->xpos     = x;
447
            mb->ypos     = y;
448
            mb->buf_offs = mb_offset;
449

    
450
            if (get_bits1(&ctx->gb)) {
451
                if (ctx->frame_type == FRAMETYPE_INTRA) {
452
                    av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
453
                    return -1;
454
                }
455
                mb->type = 1; /* empty macroblocks are always INTER */
456
                mb->cbp  = 0; /* all blocks are empty */
457

    
458
                mb->q_delta = 0;
459
                if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {
460
                    mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
461
                                           IVI_VLC_BITS, 1);
462
                    mb->q_delta = IVI_TOSIGNED(mb->q_delta);
463
                }
464

    
465
                mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
466
                if (band->inherit_mv){
467
                    /* motion vector inheritance */
468
                    if (mv_scale) {
469
                        mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
470
                        mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
471
                    } else {
472
                        mb->mv_x = ref_mb->mv_x;
473
                        mb->mv_y = ref_mb->mv_y;
474
                    }
475
                }
476
            } else {
477
                if (band->inherit_mv) {
478
                    mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
479
                } else if (ctx->frame_type == FRAMETYPE_INTRA) {
480
                    mb->type = 0; /* mb_type is always INTRA for intra-frames */
481
                } else {
482
                    mb->type = get_bits1(&ctx->gb);
483
                }
484

    
485
                blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
486
                mb->cbp = get_bits(&ctx->gb, blks_per_mb);
487

    
488
                mb->q_delta = 0;
489
                if (band->qdelta_present) {
490
                    if (band->inherit_qdelta) {
491
                        if (ref_mb) mb->q_delta = ref_mb->q_delta;
492
                    } else if (mb->cbp || (!band->plane && !band->band_num &&
493
                                           (ctx->frame_flags & 8))) {
494
                        mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
495
                                               IVI_VLC_BITS, 1);
496
                        mb->q_delta = IVI_TOSIGNED(mb->q_delta);
497
                    }
498
                }
499

    
500
                if (!mb->type) {
501
                    mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
502
                } else {
503
                    if (band->inherit_mv){
504
                        /* motion vector inheritance */
505
                        if (mv_scale) {
506
                            mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
507
                            mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
508
                        } else {
509
                            mb->mv_x = ref_mb->mv_x;
510
                            mb->mv_y = ref_mb->mv_y;
511
                        }
512
                    } else {
513
                        /* decode motion vector deltas */
514
                        mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
515
                                            IVI_VLC_BITS, 1);
516
                        mv_y += IVI_TOSIGNED(mv_delta);
517
                        mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
518
                                            IVI_VLC_BITS, 1);
519
                        mv_x += IVI_TOSIGNED(mv_delta);
520
                        mb->mv_x = mv_x;
521
                        mb->mv_y = mv_y;
522
                    }
523
                }
524
            }
525

    
526
            mb++;
527
            if (ref_mb)
528
                ref_mb++;
529
            mb_offset += band->mb_size;
530
        }
531

    
532
        offs += row_offset;
533
    }
534

    
535
    align_get_bits(&ctx->gb);
536

    
537
    return 0;
538
}
539

    
540

    
541
/**
542
 *  Decodes an Indeo5 band.
543
 *
544
 *  @param ctx      [in,out] ptr to the decoder context
545
 *  @param band     [in,out] ptr to the band descriptor
546
 *  @param avctx    [in] ptr to the AVCodecContext
547
 *  @return         result code: 0 = OK, -1 = error
548
 */
549
static int decode_band(IVI5DecContext *ctx, int plane_num,
550
                       IVIBandDesc *band, AVCodecContext *avctx)
551
{
552
    int         result, i, t, idx1, idx2, pos;
553
    IVITile     *tile;
554

    
555
    band->buf     = band->bufs[ctx->dst_buf];
556
    band->ref_buf = band->bufs[ctx->ref_buf];
557
    band->data_ptr = ctx->frame_data + (get_bits_count(&ctx->gb) >> 3);
558

    
559
    result = decode_band_hdr(ctx, band, avctx);
560
    if (result) {
561
        av_log(avctx, AV_LOG_ERROR, "Error while decoding band header: %d\n",
562
               result);
563
        return -1;
564
    }
565

    
566
    if (band->is_empty) {
567
        av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");
568
        return -1;
569
    }
570

    
571
    if (band->blk_size == 8) {
572
        band->intra_base  = &ivi5_base_quant_8x8_intra[band->quant_mat][0];
573
        band->inter_base  = &ivi5_base_quant_8x8_inter[band->quant_mat][0];
574
        band->intra_scale = &ivi5_scale_quant_8x8_intra[band->quant_mat][0];
575
        band->inter_scale = &ivi5_scale_quant_8x8_inter[band->quant_mat][0];
576
    } else {
577
        band->intra_base  = ivi5_base_quant_4x4_intra;
578
        band->inter_base  = ivi5_base_quant_4x4_inter;
579
        band->intra_scale = ivi5_scale_quant_4x4_intra;
580
        band->inter_scale = ivi5_scale_quant_4x4_inter;
581
    }
582

    
583
    band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];
584

    
585
    /* apply corrections to the selected rvmap table if present */
586
    for (i = 0; i < band->num_corr; i++) {
587
        idx1 = band->corr[i*2];
588
        idx2 = band->corr[i*2+1];
589
        FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
590
        FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
591
    }
592

    
593
    pos = get_bits_count(&ctx->gb);
594

    
595
    for (t = 0; t < band->num_tiles; t++) {
596
        tile = &band->tiles[t];
597

    
598
        tile->is_empty = get_bits1(&ctx->gb);
599
        if (tile->is_empty) {
600
            ff_ivi_process_empty_tile(avctx, band, tile,
601
                                      (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
602
        } else {
603
            tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
604

    
605
            result = decode_mb_info(ctx, band, tile, avctx);
606
            if (result < 0)
607
                break;
608

    
609
            result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
610
            if (result < 0 || (get_bits_count(&ctx->gb) - pos) >> 3 != tile->data_size) {
611
                av_log(avctx, AV_LOG_ERROR, "Corrupted tile data encountered!\n");
612
                break;
613
            }
614
            pos += tile->data_size << 3; // skip to next tile
615
        }
616
    }
617

    
618
    /* restore the selected rvmap table by applying its corrections in reverse order */
619
    for (i = band->num_corr-1; i >= 0; i--) {
620
        idx1 = band->corr[i*2];
621
        idx2 = band->corr[i*2+1];
622
        FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
623
        FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
624
    }
625

    
626
#if IVI_DEBUG
627
    if (band->checksum_present) {
628
        uint16_t chksum = ivi_calc_band_checksum(band);
629
        if (chksum != band->checksum) {
630
            av_log(avctx, AV_LOG_ERROR,
631
                   "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",
632
                   band->plane, band->band_num, band->checksum, chksum);
633
        }
634
    }
635
#endif
636

    
637
    align_get_bits(&ctx->gb);
638

    
639
    return result;
640
}
641

    
642

    
643
/**
644
 *  Switches buffers.
645
 *
646
 *  @param ctx      [in,out] ptr to the decoder context
647
 *  @param avctx    [in] ptr to the AVCodecContext
648
 */
649
static void switch_buffers(IVI5DecContext *ctx, AVCodecContext *avctx)
650
{
651
    switch (ctx->frame_type) {
652
    case FRAMETYPE_INTRA:
653
        ctx->buf_switch = 0;
654
        ctx->dst_buf    = 0;
655
        ctx->ref_buf    = 0;
656
        break;
657
    case FRAMETYPE_INTER:
658
        ctx->buf_switch &= 1;
659
        /* swap buffers only if there were no droppable frames */
660
        if (ctx->prev_frame_type != FRAMETYPE_INTER_NOREF &&
661
            ctx->prev_frame_type != FRAMETYPE_INTER_SCAL)
662
            ctx->buf_switch ^= 1;
663
        ctx->dst_buf = ctx->buf_switch;
664
        ctx->ref_buf = ctx->buf_switch ^ 1;
665
        break;
666
    case FRAMETYPE_INTER_SCAL:
667
        if (ctx->prev_frame_type == FRAMETYPE_INTER_NOREF)
668
            break;
669
        if (ctx->prev_frame_type != FRAMETYPE_INTER_SCAL) {
670
            ctx->buf_switch ^= 1;
671
            ctx->dst_buf     = ctx->buf_switch;
672
            ctx->ref_buf     = ctx->buf_switch ^ 1;
673
        } else {
674
            ctx->buf_switch ^= 2;
675
            ctx->dst_buf = 2;
676
            ctx->ref_buf = ctx->buf_switch & 1;
677
            if (!(ctx->buf_switch & 2))
678
                FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
679
        }
680
        break;
681
    case FRAMETYPE_INTER_NOREF:
682
        if (ctx->prev_frame_type == FRAMETYPE_INTER_SCAL) {
683
            ctx->buf_switch ^= 2;
684
            ctx->dst_buf = 2;
685
            ctx->ref_buf = ctx->buf_switch & 1;
686
            if (!(ctx->buf_switch & 2))
687
                FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
688
        } else {
689
            ctx->buf_switch ^= 1;
690
            ctx->dst_buf     =  ctx->buf_switch & 1;
691
            ctx->ref_buf     = (ctx->buf_switch & 1) ^ 1;
692
        }
693
        break;
694
    case FRAMETYPE_NULL:
695
        return;
696
    default:
697
        av_log(avctx, AV_LOG_ERROR, "unsupported frame type: %d\n", ctx->frame_type);
698
    }
699
}
700

    
701

    
702
/**
703
 *  Initializes Indeo5 decoder.
704
 */
705
static av_cold int decode_init(AVCodecContext *avctx)
706
{
707
    IVI5DecContext  *ctx = avctx->priv_data;
708
    int             result;
709

    
710
    ff_ivi_init_static_vlc();
711

    
712
    /* copy rvmap tables in our context so we can apply changes to them */
713
    memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
714

    
715
    /* set the initial picture layout according to the basic profile:
716
       there is only one band per plane (no scalability), only one tile (no local decoding)
717
       and picture format = YVU9 */
718
    ctx->pic_conf.pic_width     = avctx->width;
719
    ctx->pic_conf.pic_height    = avctx->height;
720
    ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;
721
    ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
722
    ctx->pic_conf.tile_width    = avctx->width;
723
    ctx->pic_conf.tile_height   = avctx->height;
724
    ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;
725

    
726
    result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
727
    if (result) {
728
        av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
729
        return -1;
730
    }
731

    
732
    avctx->pix_fmt = PIX_FMT_YUV410P;
733

    
734
    return 0;
735
}
736

    
737

    
738
/**
739
 *  main decoder function
740
 */
741
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
742
                        AVPacket *avpkt)
743
{
744
    IVI5DecContext  *ctx = avctx->priv_data;
745
    const uint8_t   *buf = avpkt->data;
746
    int             buf_size = avpkt->size;
747
    int             result, p, b;
748

    
749
    init_get_bits(&ctx->gb, buf, buf_size * 8);
750
    ctx->frame_data = buf;
751
    ctx->frame_size = buf_size;
752

    
753
    result = decode_pic_hdr(ctx, avctx);
754
    if (result) {
755
        av_log(avctx, AV_LOG_ERROR,
756
               "Error while decoding picture header: %d\n", result);
757
        return -1;
758
    }
759

    
760
    if (ctx->gop_flags & IVI5_IS_PROTECTED) {
761
        av_log(avctx, AV_LOG_ERROR, "Password-protected clip!\n");
762
        return -1;
763
    }
764

    
765
    switch_buffers(ctx, avctx);
766

    
767
    //START_TIMER;
768

    
769
    if (ctx->frame_type == FRAMETYPE_NULL) {
770
        ctx->frame_type = ctx->prev_frame_type;
771
    } else {
772
        for (p = 0; p < 3; p++) {
773
            for (b = 0; b < ctx->planes[p].num_bands; b++) {
774
                result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);
775
                if (result) {
776
                    av_log(avctx, AV_LOG_ERROR,
777
                           "Error while decoding band: %d, plane: %d\n", b, p);
778
                    return -1;
779
                }
780
            }
781
        }
782
    }
783

    
784
    //STOP_TIMER("decode_planes");
785

    
786
    if (ctx->frame.data[0])
787
        avctx->release_buffer(avctx, &ctx->frame);
788

    
789
    ctx->frame.reference = 0;
790
    if (avctx->get_buffer(avctx, &ctx->frame) < 0) {
791
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
792
        return -1;
793
    }
794

    
795
    if (ctx->is_scalable) {
796
        ff_ivi_recompose53 (&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);
797
    } else {
798
        ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);
799
    }
800

    
801
    ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);
802
    ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);
803

    
804
    *data_size = sizeof(AVFrame);
805
    *(AVFrame*)data = ctx->frame;
806

    
807
    return buf_size;
808
}
809

    
810

    
811
/**
812
 *  Closes Indeo5 decoder and cleans up its context.
813
 */
814
static av_cold int decode_close(AVCodecContext *avctx)
815
{
816
    IVI5DecContext *ctx = avctx->priv_data;
817

    
818
    ff_ivi_free_buffers(&ctx->planes[0]);
819

    
820
    if (ctx->mb_vlc.cust_tab.table)
821
        free_vlc(&ctx->mb_vlc.cust_tab);
822

    
823
    if (ctx->frame.data[0])
824
        avctx->release_buffer(avctx, &ctx->frame);
825

    
826
    return 0;
827
}
828

    
829

    
830
AVCodec indeo5_decoder = {
831
    .name           = "indeo5",
832
    .type           = CODEC_TYPE_VIDEO,
833
    .id             = CODEC_ID_INDEO5,
834
    .priv_data_size = sizeof(IVI5DecContext),
835
    .init           = decode_init,
836
    .close          = decode_close,
837
    .decode         = decode_frame,
838
    .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
839
};