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1
/*
2
 * DV decoder
3
 * Copyright (c) 2002 Fabrice Bellard.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
#include "avcodec.h"
20
#include "dsputil.h"
21
#include "mpegvideo.h"
22
#include "simple_idct.h"
23

    
24
#define NTSC_FRAME_SIZE 120000
25
#define PAL_FRAME_SIZE  144000
26

    
27
#define TEX_VLC_BITS 9
28

    
29
typedef struct DVVideoDecodeContext {
30
    AVCodecContext *avctx;
31
    GetBitContext gb;
32
    VLC *vlc;
33
    int sampling_411; /* 0 = 420, 1 = 411 */
34
    int width, height;
35
    UINT8 *current_picture[3]; /* picture structure */
36
    int linesize[3];
37
    DCTELEM block[5*6][64] __align8;
38
    UINT8 dv_zigzag[2][64];
39
    UINT8 idct_permutation[64];
40
    /* XXX: move it to static storage ? */
41
    UINT8 dv_shift[2][22][64];
42
    void (*idct_put[2])(UINT8 *dest, int line_size, DCTELEM *block);
43
} DVVideoDecodeContext;
44

    
45
#include "dvdata.h"
46

    
47
static VLC dv_vlc;
48
/* XXX: also include quantization */
49
static RL_VLC_ELEM *dv_rl_vlc[1];
50

    
51
static void dv_build_unquantize_tables(DVVideoDecodeContext *s)
52
{
53
    int i, q, j;
54

    
55
    /* NOTE: max left shift is 6 */
56
    for(q = 0; q < 22; q++) {
57
        /* 88 unquant */
58
        for(i = 1; i < 64; i++) {
59
            /* 88 table */
60
            j = s->idct_permutation[i];
61
            s->dv_shift[0][q][j] =
62
                dv_quant_shifts[q][dv_88_areas[i]] + 1;
63
        }
64
        
65
        /* 248 unquant */
66
        for(i = 1; i < 64; i++) {
67
            /* 248 table */
68
            s->dv_shift[1][q][i] =  
69
                    dv_quant_shifts[q][dv_248_areas[i]] + 1;
70
        }
71
    }
72
}
73

    
74
static int dvvideo_decode_init(AVCodecContext *avctx)
75
{
76
    DVVideoDecodeContext *s = avctx->priv_data;
77
    MpegEncContext s2;
78
    static int done;
79

    
80
    if (!done) {
81
        int i;
82

    
83
        done = 1;
84

    
85
        /* NOTE: as a trick, we use the fact the no codes are unused
86
           to accelerate the parsing of partial codes */
87
        init_vlc(&dv_vlc, TEX_VLC_BITS, NB_DV_VLC, 
88
                 dv_vlc_len, 1, 1, dv_vlc_bits, 2, 2);
89

    
90
        dv_rl_vlc[0] = av_malloc(dv_vlc.table_size * sizeof(RL_VLC_ELEM));
91
        for(i = 0; i < dv_vlc.table_size; i++){
92
            int code= dv_vlc.table[i][0];
93
            int len = dv_vlc.table[i][1];
94
            int level, run;
95
        
96
            if(len<0){ //more bits needed
97
                run= 0;
98
                level= code;
99
            } else if (code == (NB_DV_VLC - 1)) {
100
                /* EOB */
101
                run = 0;
102
                level = 256;
103
            } else {
104
                run=   dv_vlc_run[code] + 1;
105
                level= dv_vlc_level[code];
106
            }
107
            dv_rl_vlc[0][i].len = len;
108
            dv_rl_vlc[0][i].level = level;
109
            dv_rl_vlc[0][i].run = run;
110
        }
111
    }
112

    
113
    /* ugly way to get the idct & scantable */
114
    /* XXX: fix it */
115
    memset(&s2, 0, sizeof(MpegEncContext));
116
    s2.avctx = avctx;
117
    dsputil_init(&s2.dsp, avctx->dsp_mask);
118
    if (DCT_common_init(&s2) < 0)
119
       return -1;
120

    
121
    s->idct_put[0] = s2.idct_put;
122
    memcpy(s->idct_permutation, s2.idct_permutation, 64);
123
    memcpy(s->dv_zigzag[0], s2.intra_scantable.permutated, 64);
124

    
125
    /* XXX: use MMX also for idct248 */
126
    s->idct_put[1] = simple_idct248_put;
127
    memcpy(s->dv_zigzag[1], dv_248_zigzag, 64);
128

    
129
    /* XXX: do it only for constant case */
130
    dv_build_unquantize_tables(s);
131

    
132
    return 0;
133
}
134

    
135
//#define VLC_DEBUG
136

    
137
typedef struct BlockInfo {
138
    const UINT8 *shift_table;
139
    const UINT8 *scan_table;
140
    UINT8 pos; /* position in block */
141
    UINT8 eob_reached; /* true if EOB has been reached */
142
    UINT8 dct_mode;
143
    UINT8 partial_bit_count;
144
    UINT16 partial_bit_buffer;
145
    int shift_offset;
146
} BlockInfo;
147

    
148
/* block size in bits */
149
static const UINT16 block_sizes[6] = {
150
    112, 112, 112, 112, 80, 80
151
};
152

    
153
#ifndef ALT_BITSTREAM_READER
154
#error only works with ALT_BITSTREAM_READER
155
#endif
156

    
157
/* decode ac coefs */
158
static void dv_decode_ac(DVVideoDecodeContext *s, 
159
                         BlockInfo *mb, INT16 *block, int last_index)
160
{
161
    int last_re_index;
162
    int shift_offset = mb->shift_offset;
163
    const UINT8 *scan_table = mb->scan_table;
164
    const UINT8 *shift_table = mb->shift_table;
165
    int pos = mb->pos;
166
    int level, pos1, sign, run;
167
    int partial_bit_count;
168

    
169
    OPEN_READER(re, &s->gb);
170
    
171
#ifdef VLC_DEBUG
172
    printf("start\n");
173
#endif
174

    
175
    /* if we must parse a partial vlc, we do it here */
176
    partial_bit_count = mb->partial_bit_count;
177
    if (partial_bit_count > 0) {
178
        UINT8 buf[4];
179
        UINT32 v;
180
        int l, l1;
181
        GetBitContext gb1;
182

    
183
        /* build the dummy bit buffer */
184
        l = 16 - partial_bit_count;
185
        UPDATE_CACHE(re, &s->gb);
186
#ifdef VLC_DEBUG
187
        printf("show=%04x\n", SHOW_UBITS(re, &s->gb, 16));
188
#endif
189
        v = (mb->partial_bit_buffer << l) | SHOW_UBITS(re, &s->gb, l);
190
        buf[0] = v >> 8;
191
        buf[1] = v;
192
#ifdef VLC_DEBUG
193
        printf("v=%04x cnt=%d %04x\n", 
194
               v, partial_bit_count, (mb->partial_bit_buffer << l));
195
#endif
196
        /* try to read the codeword */
197
        init_get_bits(&gb1, buf, 4);
198
        {
199
            OPEN_READER(re1, &gb1);
200
            UPDATE_CACHE(re1, &gb1);
201
            GET_RL_VLC(level, run, re1, &gb1, dv_rl_vlc[0], 
202
                       TEX_VLC_BITS, 2);
203
            l = re1_index;
204
            CLOSE_READER(re1, &gb1);
205
        }
206
#ifdef VLC_DEBUG
207
        printf("****run=%d level=%d size=%d\n", run, level, l);
208
#endif
209
        /* compute codeword length */
210
        l1 = (level != 256 && level != 0);
211
        /* if too long, we cannot parse */
212
        l -= partial_bit_count;
213
        if ((re_index + l + l1) > last_index)
214
            return;
215
        /* skip read bits */
216
        last_re_index = 0; /* avoid warning */
217
        re_index += l;
218
        /* by definition, if we can read the vlc, all partial bits
219
           will be read (otherwise we could have read the vlc before) */
220
        mb->partial_bit_count = 0;
221
        UPDATE_CACHE(re, &s->gb);
222
        goto handle_vlc;
223
    }
224

    
225
    /* get the AC coefficients until last_index is reached */
226
    for(;;) {
227
        UPDATE_CACHE(re, &s->gb);
228
#ifdef VLC_DEBUG
229
        printf("%2d: bits=%04x index=%d\n", 
230
               pos, SHOW_UBITS(re, &s->gb, 16), re_index);
231
#endif
232
        last_re_index = re_index;
233
        GET_RL_VLC(level, run, re, &s->gb, dv_rl_vlc[0], 
234
                   TEX_VLC_BITS, 2);
235
    handle_vlc:
236
#ifdef VLC_DEBUG
237
        printf("run=%d level=%d\n", run, level);
238
#endif
239
        if (level == 256) {
240
            if (re_index > last_index) {
241
            cannot_read:
242
                /* put position before read code */
243
                re_index = last_re_index;
244
                mb->eob_reached = 0;
245
                break;
246
            }
247
            /* EOB */
248
            mb->eob_reached = 1;
249
            break;
250
        } else if (level != 0) {
251
            if ((re_index + 1) > last_index)
252
                goto cannot_read;
253
            sign = SHOW_SBITS(re, &s->gb, 1);
254
            level = (level ^ sign) - sign;
255
            LAST_SKIP_BITS(re, &s->gb, 1);
256
            pos += run;
257
            /* error */
258
            if (pos >= 64) {
259
                goto read_error;
260
            }
261
            pos1 = scan_table[pos];
262
            level = level << (shift_table[pos1] + shift_offset);
263
            block[pos1] = level;
264
            //            printf("run=%d level=%d shift=%d\n", run, level, shift_table[pos1]);
265
        } else {
266
            if (re_index > last_index)
267
                goto cannot_read;
268
            /* level is zero: means run without coding. No
269
               sign is coded */
270
            pos += run;
271
            /* error */
272
            if (pos >= 64) {
273
            read_error:
274
#if defined(VLC_DEBUG) || 1
275
                printf("error pos=%d\n", pos);
276
#endif
277
                /* for errors, we consider the eob is reached */
278
                mb->eob_reached = 1;
279
                break;
280
            }
281
        }
282
    }
283
    CLOSE_READER(re, &s->gb);
284
    mb->pos = pos;
285
}
286

    
287
static inline void bit_copy(PutBitContext *pb, GetBitContext *gb, int bits_left)
288
{
289
    while (bits_left >= 16) {
290
        put_bits(pb, 16, get_bits(gb, 16));
291
        bits_left -= 16;
292
    }
293
    if (bits_left > 0) {
294
        put_bits(pb, bits_left, get_bits(gb, bits_left));
295
    }
296
}
297

    
298
/* mb_x and mb_y are in units of 8 pixels */
299
static inline void dv_decode_video_segment(DVVideoDecodeContext *s, 
300
                                           UINT8 *buf_ptr1, 
301
                                           const UINT16 *mb_pos_ptr)
302
{
303
    int quant, dc, dct_mode, class1, j;
304
    int mb_index, mb_x, mb_y, v, last_index;
305
    DCTELEM *block, *block1;
306
    int c_offset, bits_left;
307
    UINT8 *y_ptr;
308
    BlockInfo mb_data[5 * 6], *mb, *mb1;
309
    void (*idct_put)(UINT8 *dest, int line_size, DCTELEM *block);
310
    UINT8 *buf_ptr;
311
    PutBitContext pb, vs_pb;
312
    UINT8 mb_bit_buffer[80 + 4]; /* allow some slack */
313
    int mb_bit_count;
314
    UINT8 vs_bit_buffer[5 * 80 + 4]; /* allow some slack */
315
    int vs_bit_count;
316
    
317
    memset(s->block, 0, sizeof(s->block));
318

    
319
    /* pass 1 : read DC and AC coefficients in blocks */
320
    buf_ptr = buf_ptr1;
321
    block1 = &s->block[0][0];
322
    mb1 = mb_data;
323
    init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80, NULL, NULL);
324
    vs_bit_count = 0;
325
    for(mb_index = 0; mb_index < 5; mb_index++) {
326
        /* skip header */
327
        quant = buf_ptr[3] & 0x0f;
328
        buf_ptr += 4;
329
        init_put_bits(&pb, mb_bit_buffer, 80, NULL, NULL);
330
        mb_bit_count = 0;
331
        mb = mb1;
332
        block = block1;
333
        for(j = 0;j < 6; j++) {
334
            /* NOTE: size is not important here */
335
            init_get_bits(&s->gb, buf_ptr, 14);
336
            
337
            /* get the dc */
338
            dc = get_bits(&s->gb, 9);
339
            dc = (dc << (32 - 9)) >> (32 - 9);
340
            dct_mode = get_bits1(&s->gb);
341
            mb->dct_mode = dct_mode;
342
            mb->scan_table = s->dv_zigzag[dct_mode];
343
            class1 = get_bits(&s->gb, 2);
344
            mb->shift_offset = (class1 == 3);
345
            mb->shift_table = s->dv_shift[dct_mode]
346
                [quant + dv_quant_offset[class1]];
347
            dc = dc << 2;
348
            /* convert to unsigned because 128 is not added in the
349
               standard IDCT */
350
            dc += 1024;
351
            block[0] = dc;
352
            last_index = block_sizes[j];
353
            buf_ptr += last_index >> 3;
354
            mb->pos = 0;
355
            mb->partial_bit_count = 0;
356

    
357
            dv_decode_ac(s, mb, block, last_index);
358

    
359
            /* write the remaining bits  in a new buffer only if the
360
               block is finished */
361
            bits_left = last_index - s->gb.index;
362
            if (mb->eob_reached) {
363
                mb->partial_bit_count = 0;
364
                mb_bit_count += bits_left;
365
                bit_copy(&pb, &s->gb, bits_left);
366
            } else {
367
                /* should be < 16 bits otherwise a codeword could have
368
                   been parsed */
369
                mb->partial_bit_count = bits_left;
370
                mb->partial_bit_buffer = get_bits(&s->gb, bits_left);
371
            }
372
            block += 64;
373
            mb++;
374
        }
375
        
376
        flush_put_bits(&pb);
377

    
378
        /* pass 2 : we can do it just after */
379
#ifdef VLC_DEBUG
380
        printf("***pass 2 size=%d\n", mb_bit_count);
381
#endif
382
        block = block1;
383
        mb = mb1;
384
        init_get_bits(&s->gb, mb_bit_buffer, 80);
385
        for(j = 0;j < 6; j++) {
386
            if (!mb->eob_reached && s->gb.index < mb_bit_count) {
387
                dv_decode_ac(s, mb, block, mb_bit_count);
388
                /* if still not finished, no need to parse other blocks */
389
                if (!mb->eob_reached) {
390
                    /* we could not parse the current AC coefficient,
391
                       so we add the remaining bytes */
392
                    bits_left = mb_bit_count - s->gb.index;
393
                    if (bits_left > 0) {
394
                        mb->partial_bit_count += bits_left;
395
                        mb->partial_bit_buffer = 
396
                            (mb->partial_bit_buffer << bits_left) | 
397
                            get_bits(&s->gb, bits_left);
398
                    }
399
                    goto next_mb;
400
                }
401
            }
402
            block += 64;
403
            mb++;
404
        }
405
        /* all blocks are finished, so the extra bytes can be used at
406
           the video segment level */
407
        bits_left = mb_bit_count - s->gb.index;
408
        vs_bit_count += bits_left;
409
        bit_copy(&vs_pb, &s->gb, bits_left);
410
    next_mb:
411
        mb1 += 6;
412
        block1 += 6 * 64;
413
    }
414

    
415
    /* we need a pass other the whole video segment */
416
    flush_put_bits(&vs_pb);
417
        
418
#ifdef VLC_DEBUG
419
    printf("***pass 3 size=%d\n", vs_bit_count);
420
#endif
421
    block = &s->block[0][0];
422
    mb = mb_data;
423
    init_get_bits(&s->gb, vs_bit_buffer, 5 * 80);
424
    for(mb_index = 0; mb_index < 5; mb_index++) {
425
        for(j = 0;j < 6; j++) {
426
            if (!mb->eob_reached) {
427
#ifdef VLC_DEBUG
428
                printf("start %d:%d\n", mb_index, j);
429
#endif
430
                dv_decode_ac(s, mb, block, vs_bit_count);
431
            }
432
            block += 64;
433
            mb++;
434
        }
435
    }
436
    
437
    /* compute idct and place blocks */
438
    block = &s->block[0][0];
439
    mb = mb_data;
440
    for(mb_index = 0; mb_index < 5; mb_index++) {
441
        v = *mb_pos_ptr++;
442
        mb_x = v & 0xff;
443
        mb_y = v >> 8;
444
        y_ptr = s->current_picture[0] + (mb_y * s->linesize[0] * 8) + (mb_x * 8);
445
        if (s->sampling_411)
446
            c_offset = (mb_y * s->linesize[1] * 8) + ((mb_x >> 2) * 8);
447
        else
448
            c_offset = ((mb_y >> 1) * s->linesize[1] * 8) + ((mb_x >> 1) * 8);
449
        for(j = 0;j < 6; j++) {
450
            idct_put = s->idct_put[mb->dct_mode];
451
            if (j < 4) {
452
                if (s->sampling_411 && mb_x < (704 / 8)) {
453
                    /* NOTE: at end of line, the macroblock is handled as 420 */
454
                    idct_put(y_ptr + (j * 8), s->linesize[0], block);
455
                } else {
456
                    idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->linesize[0]),
457
                             s->linesize[0], block);
458
                }
459
            } else {
460
                if (s->sampling_411 && mb_x >= (704 / 8)) {
461
                    uint8_t pixels[64], *c_ptr, *c_ptr1, *ptr;
462
                    int y, linesize;
463
                    /* NOTE: at end of line, the macroblock is handled as 420 */
464
                    idct_put(pixels, 8, block);
465
                    linesize = s->linesize[6 - j];
466
                    c_ptr = s->current_picture[6 - j] + c_offset;
467
                    ptr = pixels;
468
                    for(y = 0;y < 8; y++) {
469
                        /* convert to 411P */
470
                        c_ptr1 = c_ptr + linesize;
471
                        c_ptr1[0] = c_ptr[0] = (ptr[0] + ptr[1]) >> 1;
472
                        c_ptr1[1] = c_ptr[1] = (ptr[2] + ptr[3]) >> 1;
473
                        c_ptr1[2] = c_ptr[2] = (ptr[4] + ptr[5]) >> 1;
474
                        c_ptr1[3] = c_ptr[3] = (ptr[6] + ptr[7]) >> 1;
475
                        c_ptr += linesize * 2;
476
                        ptr += 8;
477
                    }
478
                } else {
479
                    /* don't ask me why they inverted Cb and Cr ! */
480
                    idct_put(s->current_picture[6 - j] + c_offset, 
481
                             s->linesize[6 - j], block);
482
                }
483
            }
484
            block += 64;
485
            mb++;
486
        }
487
    }
488
}
489

    
490

    
491
/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
492
   144000 bytes for PAL) */
493
static int dvvideo_decode_frame(AVCodecContext *avctx, 
494
                                 void *data, int *data_size,
495
                                 UINT8 *buf, int buf_size)
496
{
497
    DVVideoDecodeContext *s = avctx->priv_data;
498
    int sct, dsf, apt, ds, nb_dif_segs, vs, width, height, i, packet_size;
499
    unsigned size;
500
    UINT8 *buf_ptr;
501
    const UINT16 *mb_pos_ptr;
502
    AVPicture *picture;
503
    
504
    /* parse id */
505
    init_get_bits(&s->gb, buf, buf_size);
506
    sct = get_bits(&s->gb, 3);
507
    if (sct != 0)
508
        return -1;
509
    skip_bits(&s->gb, 5);
510
    get_bits(&s->gb, 4); /* dsn (sequence number */
511
    get_bits(&s->gb, 1); /* fsc (channel number) */
512
    skip_bits(&s->gb, 3);
513
    get_bits(&s->gb, 8); /* dbn (diff block number 0-134) */
514

    
515
    dsf = get_bits(&s->gb, 1); /* 0 = NTSC 1 = PAL */
516
    if (get_bits(&s->gb, 1) != 0)
517
        return -1;
518
    skip_bits(&s->gb, 11);
519
    apt = get_bits(&s->gb, 3); /* apt */
520

    
521
    get_bits(&s->gb, 1); /* tf1 */
522
    skip_bits(&s->gb, 4);
523
    get_bits(&s->gb, 3); /* ap1 */
524

    
525
    get_bits(&s->gb, 1); /* tf2 */
526
    skip_bits(&s->gb, 4);
527
    get_bits(&s->gb, 3); /* ap2 */
528

    
529
    get_bits(&s->gb, 1); /* tf3 */
530
    skip_bits(&s->gb, 4);
531
    get_bits(&s->gb, 3); /* ap3 */
532
    
533
    /* init size */
534
    width = 720;
535
    if (dsf) {
536
        avctx->frame_rate = 25 * FRAME_RATE_BASE;
537
        packet_size = PAL_FRAME_SIZE;
538
        height = 576;
539
        nb_dif_segs = 12;
540
    } else {
541
        avctx->frame_rate = 30 * FRAME_RATE_BASE;
542
        packet_size = NTSC_FRAME_SIZE;
543
        height = 480;
544
        nb_dif_segs = 10;
545
    }
546
    /* NOTE: we only accept several full frames */
547
    if (buf_size < packet_size)
548
        return -1;
549
    
550
    /* XXX: is it correct to assume that 420 is always used in PAL
551
       mode ? */
552
    s->sampling_411 = !dsf;
553
    if (s->sampling_411) {
554
        mb_pos_ptr = dv_place_411;
555
        avctx->pix_fmt = PIX_FMT_YUV411P;
556
    } else {
557
        mb_pos_ptr = dv_place_420;
558
        avctx->pix_fmt = PIX_FMT_YUV420P;
559
    }
560

    
561
    avctx->width = width;
562
    avctx->height = height;
563

    
564
    if (avctx->flags & CODEC_FLAG_DR1 && avctx->get_buffer_callback)
565
    {
566
        s->width = -1;
567
        avctx->dr_buffer[0] = avctx->dr_buffer[1] = avctx->dr_buffer[2] = 0;
568
        if(avctx->get_buffer_callback(avctx, width, height, I_TYPE) < 0){
569
            fprintf(stderr, "get_buffer() failed\n");
570
            return -1;
571
        }
572
    }
573

    
574
    /* (re)alloc picture if needed */
575
    if (s->width != width || s->height != height) {
576
        if (!(avctx->flags & CODEC_FLAG_DR1))
577
            for(i=0;i<3;i++) {
578
                if (avctx->dr_buffer[i] != s->current_picture[i])
579
                    av_freep(&s->current_picture[i]);
580
                avctx->dr_buffer[i] = 0;
581
            }
582

    
583
        for(i=0;i<3;i++) {
584
            if (avctx->dr_buffer[i]) {
585
                s->current_picture[i] = avctx->dr_buffer[i];
586
                s->linesize[i] = (i == 0) ? avctx->dr_stride : avctx->dr_uvstride;
587
            } else {
588
                size = width * height;
589
                s->linesize[i] = width;
590
                if (i >= 1) {
591
                    size >>= 2;
592
                    s->linesize[i] >>= s->sampling_411 ? 2 : 1;
593
                }
594
                s->current_picture[i] = av_malloc(size);
595
            }
596
            if (!s->current_picture[i])
597
                return -1;
598
        }
599
        s->width = width;
600
        s->height = height;
601
    }
602

    
603
    /* for each DIF segment */
604
    buf_ptr = buf;
605
    for (ds = 0; ds < nb_dif_segs; ds++) {
606
        buf_ptr += 6 * 80; /* skip DIF segment header */
607
        
608
        for(vs = 0; vs < 27; vs++) {
609
            if ((vs % 3) == 0) {
610
                /* skip audio block */
611
                buf_ptr += 80;
612
            }
613
            dv_decode_video_segment(s, buf_ptr, mb_pos_ptr);
614
            buf_ptr += 5 * 80;
615
            mb_pos_ptr += 5;
616
        }
617
    }
618

    
619
    emms_c();
620

    
621
    /* return image */
622
    *data_size = sizeof(AVPicture);
623
    picture = data;
624
    for(i=0;i<3;i++) {
625
        picture->data[i] = s->current_picture[i];
626
        picture->linesize[i] = s->linesize[i];
627
    }
628
    return packet_size;
629
}
630

    
631
static int dvvideo_decode_end(AVCodecContext *avctx)
632
{
633
    DVVideoDecodeContext *s = avctx->priv_data;
634
    int i;
635

    
636
    for(i=0;i<3;i++)
637
        if (avctx->dr_buffer[i] != s->current_picture[i])
638
        av_freep(&s->current_picture[i]);
639
    return 0;
640
}
641

    
642
AVCodec dvvideo_decoder = {
643
    "dvvideo",
644
    CODEC_TYPE_VIDEO,
645
    CODEC_ID_DVVIDEO,
646
    sizeof(DVVideoDecodeContext),
647
    dvvideo_decode_init,
648
    NULL,
649
    dvvideo_decode_end,
650
    dvvideo_decode_frame,
651
    CODEC_CAP_DR1,
652
    NULL
653
};
654

    
655
typedef struct DVAudioDecodeContext {
656
    AVCodecContext *avctx;
657
    GetBitContext gb;
658

    
659
} DVAudioDecodeContext;
660

    
661
static int dvaudio_decode_init(AVCodecContext *avctx)
662
{
663
    //    DVAudioDecodeContext *s = avctx->priv_data;
664
    return 0;
665
}
666

    
667
/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
668
   144000 bytes for PAL) */
669
static int dvaudio_decode_frame(AVCodecContext *avctx, 
670
                                 void *data, int *data_size,
671
                                 UINT8 *buf, int buf_size)
672
{
673
    //    DVAudioDecodeContext *s = avctx->priv_data;
674
    return buf_size;
675
}
676

    
677
static int dvaudio_decode_end(AVCodecContext *avctx)
678
{
679
    //    DVAudioDecodeContext *s = avctx->priv_data;
680
    return 0;
681
}
682

    
683
AVCodec dvaudio_decoder = {
684
    "dvaudio",
685
    CODEC_TYPE_AUDIO,
686
    CODEC_ID_DVAUDIO,
687
    sizeof(DVAudioDecodeContext),
688
    dvaudio_decode_init,
689
    NULL,
690
    dvaudio_decode_end,
691
    dvaudio_decode_frame,
692
    0,
693
    NULL
694
};