3
* Copyright (c) 2002 Fabrice Bellard.
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.
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.
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
26
#include "mpegvideo.h"
27
#include "simple_idct.h"
29
#define NTSC_FRAME_SIZE 120000
30
#define PAL_FRAME_SIZE 144000
32
#define TEX_VLC_BITS 9
34
typedef struct DVVideoDecodeContext {
35
AVCodecContext *avctx;
38
int sampling_411; /* 0 = 420, 1 = 411 */
40
uint8_t *current_picture[3]; /* picture structure */
43
DCTELEM block[5*6][64] __align8;
44
uint8_t dv_zigzag[2][64];
45
uint8_t idct_permutation[64];
46
/* XXX: move it to static storage ? */
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uint8_t dv_shift[2][22][64];
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void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
49
} DVVideoDecodeContext;
54
/* XXX: also include quantization */
55
static RL_VLC_ELEM *dv_rl_vlc[1];
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static void dv_build_unquantize_tables(DVVideoDecodeContext *s)
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/* NOTE: max left shift is 6 */
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for(q = 0; q < 22; q++) {
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for(i = 1; i < 64; i++) {
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j = s->idct_permutation[i];
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s->dv_shift[0][q][j] =
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dv_quant_shifts[q][dv_88_areas[i]] + 1;
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for(i = 1; i < 64; i++) {
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s->dv_shift[1][q][i] =
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dv_quant_shifts[q][dv_248_areas[i]] + 1;
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static int dvvideo_decode_init(AVCodecContext *avctx)
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DVVideoDecodeContext *s = avctx->priv_data;
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/* NOTE: as a trick, we use the fact the no codes are unused
92
to accelerate the parsing of partial codes */
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init_vlc(&dv_vlc, TEX_VLC_BITS, NB_DV_VLC,
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dv_vlc_len, 1, 1, dv_vlc_bits, 2, 2);
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dv_rl_vlc[0] = av_malloc(dv_vlc.table_size * sizeof(RL_VLC_ELEM));
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for(i = 0; i < dv_vlc.table_size; i++){
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int code= dv_vlc.table[i][0];
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int len = dv_vlc.table[i][1];
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if(len<0){ //more bits needed
105
} else if (code == (NB_DV_VLC - 1)) {
110
run= dv_vlc_run[code] + 1;
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level= dv_vlc_level[code];
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dv_rl_vlc[0][i].len = len;
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dv_rl_vlc[0][i].level = level;
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dv_rl_vlc[0][i].run = run;
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/* ugly way to get the idct & scantable */
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memset(&s2, 0, sizeof(MpegEncContext));
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dsputil_init(&s2.dsp, avctx);
124
if (DCT_common_init(&s2) < 0)
127
s->idct_put[0] = s2.dsp.idct_put;
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memcpy(s->idct_permutation, s2.dsp.idct_permutation, 64);
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memcpy(s->dv_zigzag[0], s2.intra_scantable.permutated, 64);
131
/* XXX: use MMX also for idct248 */
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s->idct_put[1] = simple_idct248_put;
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memcpy(s->dv_zigzag[1], dv_248_zigzag, 64);
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/* XXX: do it only for constant case */
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dv_build_unquantize_tables(s);
143
typedef struct BlockInfo {
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const uint8_t *shift_table;
145
const uint8_t *scan_table;
146
uint8_t pos; /* position in block */
147
uint8_t eob_reached; /* true if EOB has been reached */
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uint8_t partial_bit_count;
150
uint16_t partial_bit_buffer;
154
/* block size in bits */
155
static const uint16_t block_sizes[6] = {
156
112, 112, 112, 112, 80, 80
159
#ifndef ALT_BITSTREAM_READER
160
#warning only works with ALT_BITSTREAM_READER
163
/* decode ac coefs */
164
static void dv_decode_ac(DVVideoDecodeContext *s,
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BlockInfo *mb, DCTELEM *block, int last_index)
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int shift_offset = mb->shift_offset;
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const uint8_t *scan_table = mb->scan_table;
170
const uint8_t *shift_table = mb->shift_table;
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int level, pos1, sign, run;
173
int partial_bit_count;
174
#ifndef ALT_BITSTREAM_READER //FIXME
178
OPEN_READER(re, &s->gb);
184
/* if we must parse a partial vlc, we do it here */
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partial_bit_count = mb->partial_bit_count;
186
if (partial_bit_count > 0) {
192
/* build the dummy bit buffer */
193
l = 16 - partial_bit_count;
194
UPDATE_CACHE(re, &s->gb);
196
printf("show=%04x\n", SHOW_UBITS(re, &s->gb, 16));
198
v = (mb->partial_bit_buffer << l) | SHOW_UBITS(re, &s->gb, l);
202
printf("v=%04x cnt=%d %04x\n",
203
v, partial_bit_count, (mb->partial_bit_buffer << l));
205
/* try to read the codeword */
206
init_get_bits(&gb1, buf, 4*8);
208
OPEN_READER(re1, &gb1);
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UPDATE_CACHE(re1, &gb1);
210
GET_RL_VLC(level, run, re1, &gb1, dv_rl_vlc[0],
213
CLOSE_READER(re1, &gb1);
216
printf("****run=%d level=%d size=%d\n", run, level, l);
218
/* compute codeword length */
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l1 = (level != 256 && level != 0);
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/* if too long, we cannot parse */
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l -= partial_bit_count;
222
if ((re_index + l + l1) > last_index)
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last_re_index = 0; /* avoid warning */
227
/* by definition, if we can read the vlc, all partial bits
228
will be read (otherwise we could have read the vlc before) */
229
mb->partial_bit_count = 0;
230
UPDATE_CACHE(re, &s->gb);
234
/* get the AC coefficients until last_index is reached */
236
UPDATE_CACHE(re, &s->gb);
238
printf("%2d: bits=%04x index=%d\n",
239
pos, SHOW_UBITS(re, &s->gb, 16), re_index);
241
last_re_index = re_index;
242
GET_RL_VLC(level, run, re, &s->gb, dv_rl_vlc[0],
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printf("run=%d level=%d\n", run, level);
249
if (re_index > last_index) {
251
/* put position before read code */
252
re_index = last_re_index;
259
} else if (level != 0) {
260
if ((re_index + 1) > last_index)
262
sign = SHOW_SBITS(re, &s->gb, 1);
263
level = (level ^ sign) - sign;
264
LAST_SKIP_BITS(re, &s->gb, 1);
270
pos1 = scan_table[pos];
271
level = level << (shift_table[pos1] + shift_offset);
273
// printf("run=%d level=%d shift=%d\n", run, level, shift_table[pos1]);
275
if (re_index > last_index)
277
/* level is zero: means run without coding. No
283
#if defined(VLC_DEBUG) || 1
284
fprintf(stderr, "error pos=%d\n", pos);
286
/* for errors, we consider the eob is reached */
292
CLOSE_READER(re, &s->gb);
296
static inline void bit_copy(PutBitContext *pb, GetBitContext *gb, int bits_left)
298
while (bits_left >= 16) {
299
put_bits(pb, 16, get_bits(gb, 16));
303
put_bits(pb, bits_left, get_bits(gb, bits_left));
307
/* mb_x and mb_y are in units of 8 pixels */
308
static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
310
const uint16_t *mb_pos_ptr)
312
int quant, dc, dct_mode, class1, j;
313
int mb_index, mb_x, mb_y, v, last_index;
314
DCTELEM *block, *block1;
315
int c_offset, bits_left;
317
BlockInfo mb_data[5 * 6], *mb, *mb1;
318
void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);
320
PutBitContext pb, vs_pb;
321
uint8_t mb_bit_buffer[80 + 4]; /* allow some slack */
323
uint8_t vs_bit_buffer[5 * 80 + 4]; /* allow some slack */
326
memset(s->block, 0, sizeof(s->block));
328
/* pass 1 : read DC and AC coefficients in blocks */
330
block1 = &s->block[0][0];
332
init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80, NULL, NULL);
334
for(mb_index = 0; mb_index < 5; mb_index++) {
336
quant = buf_ptr[3] & 0x0f;
338
init_put_bits(&pb, mb_bit_buffer, 80, NULL, NULL);
342
for(j = 0;j < 6; j++) {
343
/* NOTE: size is not important here */
344
init_get_bits(&s->gb, buf_ptr, 14*8);
347
dc = get_bits(&s->gb, 9);
348
dc = (dc << (32 - 9)) >> (32 - 9);
349
dct_mode = get_bits1(&s->gb);
350
mb->dct_mode = dct_mode;
351
mb->scan_table = s->dv_zigzag[dct_mode];
352
class1 = get_bits(&s->gb, 2);
353
mb->shift_offset = (class1 == 3);
354
mb->shift_table = s->dv_shift[dct_mode]
355
[quant + dv_quant_offset[class1]];
357
/* convert to unsigned because 128 is not added in the
361
last_index = block_sizes[j];
362
buf_ptr += last_index >> 3;
364
mb->partial_bit_count = 0;
366
dv_decode_ac(s, mb, block, last_index);
368
/* write the remaining bits in a new buffer only if the
370
bits_left = last_index - get_bits_count(&s->gb);
371
if (mb->eob_reached) {
372
mb->partial_bit_count = 0;
373
mb_bit_count += bits_left;
374
bit_copy(&pb, &s->gb, bits_left);
376
/* should be < 16 bits otherwise a codeword could have
378
mb->partial_bit_count = bits_left;
379
mb->partial_bit_buffer = get_bits(&s->gb, bits_left);
387
/* pass 2 : we can do it just after */
389
printf("***pass 2 size=%d\n", mb_bit_count);
393
init_get_bits(&s->gb, mb_bit_buffer, 80*8);
394
for(j = 0;j < 6; j++) {
395
if (!mb->eob_reached && get_bits_count(&s->gb) < mb_bit_count) {
396
dv_decode_ac(s, mb, block, mb_bit_count);
397
/* if still not finished, no need to parse other blocks */
398
if (!mb->eob_reached) {
399
/* we could not parse the current AC coefficient,
400
so we add the remaining bytes */
401
bits_left = mb_bit_count - get_bits_count(&s->gb);
403
mb->partial_bit_count += bits_left;
404
mb->partial_bit_buffer =
405
(mb->partial_bit_buffer << bits_left) |
406
get_bits(&s->gb, bits_left);
414
/* all blocks are finished, so the extra bytes can be used at
415
the video segment level */
416
bits_left = mb_bit_count - get_bits_count(&s->gb);
417
vs_bit_count += bits_left;
418
bit_copy(&vs_pb, &s->gb, bits_left);
424
/* we need a pass other the whole video segment */
425
flush_put_bits(&vs_pb);
428
printf("***pass 3 size=%d\n", vs_bit_count);
430
block = &s->block[0][0];
432
init_get_bits(&s->gb, vs_bit_buffer, 5 * 80*8);
433
for(mb_index = 0; mb_index < 5; mb_index++) {
434
for(j = 0;j < 6; j++) {
435
if (!mb->eob_reached) {
437
printf("start %d:%d\n", mb_index, j);
439
dv_decode_ac(s, mb, block, vs_bit_count);
446
/* compute idct and place blocks */
447
block = &s->block[0][0];
449
for(mb_index = 0; mb_index < 5; mb_index++) {
453
y_ptr = s->current_picture[0] + (mb_y * s->linesize[0] * 8) + (mb_x * 8);
455
c_offset = (mb_y * s->linesize[1] * 8) + ((mb_x >> 2) * 8);
457
c_offset = ((mb_y >> 1) * s->linesize[1] * 8) + ((mb_x >> 1) * 8);
458
for(j = 0;j < 6; j++) {
459
idct_put = s->idct_put[mb->dct_mode];
461
if (s->sampling_411 && mb_x < (704 / 8)) {
462
/* NOTE: at end of line, the macroblock is handled as 420 */
463
idct_put(y_ptr + (j * 8), s->linesize[0], block);
465
idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->linesize[0]),
466
s->linesize[0], block);
469
if (s->sampling_411 && mb_x >= (704 / 8)) {
470
uint8_t pixels[64], *c_ptr, *c_ptr1, *ptr;
472
/* NOTE: at end of line, the macroblock is handled as 420 */
473
idct_put(pixels, 8, block);
474
linesize = s->linesize[6 - j];
475
c_ptr = s->current_picture[6 - j] + c_offset;
477
for(y = 0;y < 8; y++) {
478
/* convert to 411P */
479
c_ptr1 = c_ptr + 8*linesize;
480
c_ptr[0]= ptr[0]; c_ptr1[0]= ptr[4];
481
c_ptr[1]= ptr[1]; c_ptr1[1]= ptr[5];
482
c_ptr[2]= ptr[2]; c_ptr1[2]= ptr[6];
483
c_ptr[3]= ptr[3]; c_ptr1[3]= ptr[7];
488
/* don't ask me why they inverted Cb and Cr ! */
489
idct_put(s->current_picture[6 - j] + c_offset,
490
s->linesize[6 - j], block);
500
/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
501
144000 bytes for PAL) */
502
static int dvvideo_decode_frame(AVCodecContext *avctx,
503
void *data, int *data_size,
504
uint8_t *buf, int buf_size)
506
DVVideoDecodeContext *s = avctx->priv_data;
507
int sct, dsf, apt, ds, nb_dif_segs, vs, width, height, i, packet_size;
509
const uint16_t *mb_pos_ptr;
512
init_get_bits(&s->gb, buf, buf_size*8);
513
sct = get_bits(&s->gb, 3);
516
skip_bits(&s->gb, 5);
517
get_bits(&s->gb, 4); /* dsn (sequence number */
518
get_bits(&s->gb, 1); /* fsc (channel number) */
519
skip_bits(&s->gb, 3);
520
get_bits(&s->gb, 8); /* dbn (diff block number 0-134) */
522
dsf = get_bits(&s->gb, 1); /* 0 = NTSC 1 = PAL */
523
if (get_bits(&s->gb, 1) != 0)
525
skip_bits(&s->gb, 11);
526
apt = get_bits(&s->gb, 3); /* apt */
528
get_bits(&s->gb, 1); /* tf1 */
529
skip_bits(&s->gb, 4);
530
get_bits(&s->gb, 3); /* ap1 */
532
get_bits(&s->gb, 1); /* tf2 */
533
skip_bits(&s->gb, 4);
534
get_bits(&s->gb, 3); /* ap2 */
536
get_bits(&s->gb, 1); /* tf3 */
537
skip_bits(&s->gb, 4);
538
get_bits(&s->gb, 3); /* ap3 */
543
avctx->frame_rate = 25;
544
avctx->frame_rate_base = 1;
545
packet_size = PAL_FRAME_SIZE;
549
avctx->frame_rate = 30000;
550
avctx->frame_rate_base = 1001;
551
packet_size = NTSC_FRAME_SIZE;
555
/* NOTE: we only accept several full frames */
556
if (buf_size < packet_size)
559
/* NTSC[dsf == 0] is always 720x480, 4:1:1
560
* PAL[dsf == 1] is always 720x576, 4:2:0 for IEC 68134[apt == 0]
561
* but for the SMPTE 314M[apt == 1] it is 720x576, 4:1:1
563
s->sampling_411 = !dsf || apt;
564
if (s->sampling_411) {
565
mb_pos_ptr = dsf ? dv_place_411P : dv_place_411;
566
avctx->pix_fmt = PIX_FMT_YUV411P;
568
mb_pos_ptr = dv_place_420;
569
avctx->pix_fmt = PIX_FMT_YUV420P;
572
avctx->width = width;
573
avctx->height = height;
575
/* Once again, this is pretty complicated by the fact that the same
576
* field is used differently by IEC 68134[apt == 0] and
577
* SMPTE 314M[apt == 1].
579
if (buf[VAUX_TC61_OFFSET] == 0x61 &&
580
((apt == 0 && (buf[VAUX_TC61_OFFSET + 2] & 0x07) == 0x07) ||
581
(apt == 1 && (buf[VAUX_TC61_OFFSET + 2] & 0x07) == 0x02)))
582
avctx->aspect_ratio = 16.0 / 9.0;
584
avctx->aspect_ratio = 4.0 / 3.0;
586
if(s->picture.data[0])
587
avctx->release_buffer(avctx, &s->picture);
589
s->picture.reference= 0;
590
if(avctx->get_buffer(avctx, &s->picture) < 0) {
591
fprintf(stderr, "get_buffer() failed\n");
596
s->current_picture[i] = s->picture.data[i];
597
s->linesize[i] = s->picture.linesize[i];
598
if (!s->current_picture[i])
604
/* for each DIF segment */
606
for (ds = 0; ds < nb_dif_segs; ds++) {
607
buf_ptr += 6 * 80; /* skip DIF segment header */
609
for(vs = 0; vs < 27; vs++) {
611
/* skip audio block */
614
dv_decode_video_segment(s, buf_ptr, mb_pos_ptr);
623
*data_size = sizeof(AVFrame);
624
*(AVFrame*)data= s->picture;
629
static int dvvideo_decode_end(AVCodecContext *avctx)
631
avcodec_default_free_buffers(avctx);
636
AVCodec dvvideo_decoder = {
640
sizeof(DVVideoDecodeContext),
644
dvvideo_decode_frame,
649
typedef struct DVAudioDecodeContext {
650
AVCodecContext *avctx;
652
} DVAudioDecodeContext;
654
static int dvaudio_decode_init(AVCodecContext *avctx)
656
// DVAudioDecodeContext *s = avctx->priv_data;
660
static uint16_t dv_audio_12to16(uint16_t sample)
662
uint16_t shift, result;
664
sample = (sample < 0x800) ? sample : sample | 0xf000;
665
shift = (sample & 0xf00) >> 8;
667
if (shift < 0x2 || shift > 0xd) {
669
} else if (shift < 0x8) {
671
result = (sample - (256 * shift)) << shift;
674
result = ((sample + ((256 * shift) + 1)) << shift) - 1;
680
/* NOTE: exactly one frame must be given (120000 bytes for NTSC,
681
144000 bytes for PAL)
683
There's a couple of assumptions being made here:
684
1. By default we silence erroneous (0x8000/16bit 0x800/12bit)
685
audio samples. We can pass them upwards when ffmpeg will be ready
687
2. We don't do software emphasis.
688
3. Audio is always returned as 16bit linear samples: 12bit
689
nonlinear samples are converted into 16bit linear ones.
691
static int dvaudio_decode_frame(AVCodecContext *avctx,
692
void *data, int *data_size,
693
uint8_t *buf, int buf_size)
695
DVVideoDecodeContext *s = avctx->priv_data;
696
const uint16_t (*unshuffle)[9];
697
int smpls, freq, quant, sys, stride, difseg, ad, dp, nb_dif_segs, i;
702
init_get_bits(&s->gb, &buf[AAUX_AS_OFFSET], 5*8);
703
i = get_bits(&s->gb, 8);
704
if (i != 0x50) { /* No audio ? */
709
get_bits(&s->gb, 1); /* 0 - locked audio, 1 - unlocked audio */
710
skip_bits(&s->gb, 1);
711
smpls = get_bits(&s->gb, 6); /* samples in this frame - min. samples */
713
skip_bits(&s->gb, 8);
715
skip_bits(&s->gb, 2);
716
sys = get_bits(&s->gb, 1); /* 0 - 60 fields, 1 = 50 fields */
717
skip_bits(&s->gb, 5);
719
get_bits(&s->gb, 1); /* 0 - emphasis on, 1 - emphasis off */
720
get_bits(&s->gb, 1); /* 0 - reserved, 1 - emphasis time constant 50/15us */
721
freq = get_bits(&s->gb, 3); /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
722
quant = get_bits(&s->gb, 3); /* 0 - 16bit linear, 1 - 12bit nonlinear */
725
return -1; /* Unsupported quantization */
727
avctx->sample_rate = dv_audio_frequency[freq];
729
avctx->bit_rate = avctx->channels * avctx->sample_rate * 16;
731
// avctx->frame_size =
733
*data_size = (dv_audio_min_samples[sys][freq] + smpls) *
739
unshuffle = dv_place_audio50;
743
unshuffle = dv_place_audio60;
746
/* for each DIF segment */
748
for (difseg = 0; difseg < nb_dif_segs; difseg++) {
749
buf_ptr += 6 * 80; /* skip DIF segment header */
750
for (ad = 0; ad < 9; ad++) {
752
for (dp = 8; dp < 80; dp+=2) {
753
if (quant == 0) { /* 16bit quantization */
754
i = unshuffle[difseg][ad] + (dp - 8)/2 * stride;
755
((short *)data)[i] = (buf_ptr[dp] << 8) | buf_ptr[dp+1];
756
if (((unsigned short *)data)[i] == 0x8000)
757
((short *)data)[i] = 0;
758
} else { /* 12bit quantization */
759
if (difseg >= nb_dif_segs/2)
760
goto out; /* We're not doing 4ch at this time */
762
lc = ((uint16_t)buf_ptr[dp] << 4) |
763
((uint16_t)buf_ptr[dp+2] >> 4);
764
rc = ((uint16_t)buf_ptr[dp+1] << 4) |
765
((uint16_t)buf_ptr[dp+2] & 0x0f);
766
lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
767
rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
769
i = unshuffle[difseg][ad] + (dp - 8)/3 * stride;
770
((short *)data)[i] = lc;
771
i = unshuffle[difseg+nb_dif_segs/2][ad] + (dp - 8)/3 * stride;
772
((short *)data)[i] = rc;
777
buf_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
785
static int dvaudio_decode_end(AVCodecContext *avctx)
787
// DVAudioDecodeContext *s = avctx->priv_data;
791
AVCodec dvaudio_decoder = {
795
sizeof(DVAudioDecodeContext),
799
dvaudio_decode_frame,
added
removed
ffmpeg/libavcodec/dv.c
