3 * Copyright (c) 2001, 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * @file libavcodec/mpegaudiodec.c
28 #include "bitstream.h"
33 * - in low precision mode, use more 16 bit multiplies in synth filter
34 * - test lsf / mpeg25 extensively.
37 #include "mpegaudio.h"
38 #include "mpegaudiodecheader.h"
42 /* WARNING: only correct for posititive numbers */
43 #define FIXR(a) ((int)((a) * FRAC_ONE + 0.5))
44 #define FRAC_RND(a) (((a) + (FRAC_ONE/2)) >> FRAC_BITS)
46 #define FIXHR(a) ((int)((a) * (1LL<<32) + 0.5))
52 /* layer 3 "granule" */
53 typedef struct GranuleDef
{
58 int scalefac_compress
;
63 uint8_t scalefac_scale
;
64 uint8_t count1table_select
;
65 int region_size
[3]; /* number of huffman codes in each region */
67 int short_start
, long_end
; /* long/short band indexes */
68 uint8_t scale_factors
[40];
69 int32_t sb_hybrid
[SBLIMIT
* 18]; /* 576 samples */
72 #include "mpegaudiodata.h"
73 #include "mpegaudiodectab.h"
75 static void compute_antialias_integer(MPADecodeContext
*s
, GranuleDef
*g
);
76 static void compute_antialias_float(MPADecodeContext
*s
, GranuleDef
*g
);
78 /* vlc structure for decoding layer 3 huffman tables */
79 static VLC huff_vlc
[16];
80 static VLC_TYPE huff_vlc_tables
[
81 0+128+128+128+130+128+154+166+
82 142+204+190+170+542+460+662+414
84 static const int huff_vlc_tables_sizes
[16] = {
85 0, 128, 128, 128, 130, 128, 154, 166,
86 142, 204, 190, 170, 542, 460, 662, 414
88 static VLC huff_quad_vlc
[2];
89 static VLC_TYPE huff_quad_vlc_tables
[128+16][2];
90 static const int huff_quad_vlc_tables_sizes
[2] = {
93 /* computed from band_size_long */
94 static uint16_t band_index_long
[9][23];
95 /* XXX: free when all decoders are closed */
96 #define TABLE_4_3_SIZE (8191 + 16)*4
97 static int8_t table_4_3_exp
[TABLE_4_3_SIZE
];
98 static uint32_t table_4_3_value
[TABLE_4_3_SIZE
];
99 static uint32_t exp_table
[512];
100 static uint32_t expval_table
[512][16];
101 /* intensity stereo coef table */
102 static int32_t is_table
[2][16];
103 static int32_t is_table_lsf
[2][2][16];
104 static int32_t csa_table
[8][4];
105 static float csa_table_float
[8][4];
106 static int32_t mdct_win
[8][36];
108 /* lower 2 bits: modulo 3, higher bits: shift */
109 static uint16_t scale_factor_modshift
[64];
110 /* [i][j]: 2^(-j/3) * FRAC_ONE * 2^(i+2) / (2^(i+2) - 1) */
111 static int32_t scale_factor_mult
[15][3];
112 /* mult table for layer 2 group quantization */
114 #define SCALE_GEN(v) \
115 { FIXR(1.0 * (v)), FIXR(0.7937005259 * (v)), FIXR(0.6299605249 * (v)) }
117 static const int32_t scale_factor_mult2
[3][3] = {
118 SCALE_GEN(4.0 / 3.0), /* 3 steps */
119 SCALE_GEN(4.0 / 5.0), /* 5 steps */
120 SCALE_GEN(4.0 / 9.0), /* 9 steps */
123 static DECLARE_ALIGNED_16(MPA_INT
, window
[512]);
126 * Convert region offsets to region sizes and truncate
127 * size to big_values.
129 void ff_region_offset2size(GranuleDef
*g
){
131 g
->region_size
[2] = (576 / 2);
133 k
= FFMIN(g
->region_size
[i
], g
->big_values
);
134 g
->region_size
[i
] = k
- j
;
139 void ff_init_short_region(MPADecodeContext
*s
, GranuleDef
*g
){
140 if (g
->block_type
== 2)
141 g
->region_size
[0] = (36 / 2);
143 if (s
->sample_rate_index
<= 2)
144 g
->region_size
[0] = (36 / 2);
145 else if (s
->sample_rate_index
!= 8)
146 g
->region_size
[0] = (54 / 2);
148 g
->region_size
[0] = (108 / 2);
150 g
->region_size
[1] = (576 / 2);
153 void ff_init_long_region(MPADecodeContext
*s
, GranuleDef
*g
, int ra1
, int ra2
){
156 band_index_long
[s
->sample_rate_index
][ra1
+ 1] >> 1;
157 /* should not overflow */
158 l
= FFMIN(ra1
+ ra2
+ 2, 22);
160 band_index_long
[s
->sample_rate_index
][l
] >> 1;
163 void ff_compute_band_indexes(MPADecodeContext
*s
, GranuleDef
*g
){
164 if (g
->block_type
== 2) {
165 if (g
->switch_point
) {
166 /* if switched mode, we handle the 36 first samples as
167 long blocks. For 8000Hz, we handle the 48 first
168 exponents as long blocks (XXX: check this!) */
169 if (s
->sample_rate_index
<= 2)
171 else if (s
->sample_rate_index
!= 8)
174 g
->long_end
= 4; /* 8000 Hz */
176 g
->short_start
= 2 + (s
->sample_rate_index
!= 8);
187 /* layer 1 unscaling */
188 /* n = number of bits of the mantissa minus 1 */
189 static inline int l1_unscale(int n
, int mant
, int scale_factor
)
194 shift
= scale_factor_modshift
[scale_factor
];
197 val
= MUL64(mant
+ (-1 << n
) + 1, scale_factor_mult
[n
-1][mod
]);
199 /* NOTE: at this point, 1 <= shift >= 21 + 15 */
200 return (int)((val
+ (1LL << (shift
- 1))) >> shift
);
203 static inline int l2_unscale_group(int steps
, int mant
, int scale_factor
)
207 shift
= scale_factor_modshift
[scale_factor
];
211 val
= (mant
- (steps
>> 1)) * scale_factor_mult2
[steps
>> 2][mod
];
212 /* NOTE: at this point, 0 <= shift <= 21 */
214 val
= (val
+ (1 << (shift
- 1))) >> shift
;
218 /* compute value^(4/3) * 2^(exponent/4). It normalized to FRAC_BITS */
219 static inline int l3_unscale(int value
, int exponent
)
224 e
= table_4_3_exp
[4*value
+ (exponent
&3)];
225 m
= table_4_3_value
[4*value
+ (exponent
&3)];
226 e
-= (exponent
>> 2);
230 m
= (m
+ (1 << (e
-1))) >> e
;
235 /* all integer n^(4/3) computation code */
238 #define POW_FRAC_BITS 24
239 #define POW_FRAC_ONE (1 << POW_FRAC_BITS)
240 #define POW_FIX(a) ((int)((a) * POW_FRAC_ONE))
241 #define POW_MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> POW_FRAC_BITS)
243 static int dev_4_3_coefs
[DEV_ORDER
];
246 static int pow_mult3
[3] = {
248 POW_FIX(1.25992104989487316476),
249 POW_FIX(1.58740105196819947474),
253 static void int_pow_init(void)
258 for(i
=0;i
<DEV_ORDER
;i
++) {
259 a
= POW_MULL(a
, POW_FIX(4.0 / 3.0) - i
* POW_FIX(1.0)) / (i
+ 1);
260 dev_4_3_coefs
[i
] = a
;
264 #if 0 /* unused, remove? */
265 /* return the mantissa and the binary exponent */
266 static int int_pow(int i
, int *exp_ptr
)
274 while (a
< (1 << (POW_FRAC_BITS
- 1))) {
278 a
-= (1 << POW_FRAC_BITS
);
280 for(j
= DEV_ORDER
- 1; j
>= 0; j
--)
281 a1
= POW_MULL(a
, dev_4_3_coefs
[j
] + a1
);
282 a
= (1 << POW_FRAC_BITS
) + a1
;
283 /* exponent compute (exact) */
287 a
= POW_MULL(a
, pow_mult3
[er
]);
288 while (a
>= 2 * POW_FRAC_ONE
) {
292 /* convert to float */
293 while (a
< POW_FRAC_ONE
) {
297 /* now POW_FRAC_ONE <= a < 2 * POW_FRAC_ONE */
298 #if POW_FRAC_BITS > FRAC_BITS
299 a
= (a
+ (1 << (POW_FRAC_BITS
- FRAC_BITS
- 1))) >> (POW_FRAC_BITS
- FRAC_BITS
);
300 /* correct overflow */
301 if (a
>= 2 * (1 << FRAC_BITS
)) {
311 static int decode_init(AVCodecContext
* avctx
)
313 MPADecodeContext
*s
= avctx
->priv_data
;
319 avctx
->sample_fmt
= OUT_FMT
;
320 s
->error_recognition
= avctx
->error_recognition
;
322 if(avctx
->antialias_algo
!= FF_AA_FLOAT
)
323 s
->compute_antialias
= compute_antialias_integer
;
325 s
->compute_antialias
= compute_antialias_float
;
327 if (!init
&& !avctx
->parse_only
) {
330 /* scale factors table for layer 1/2 */
333 /* 1.0 (i = 3) is normalized to 2 ^ FRAC_BITS */
336 scale_factor_modshift
[i
] = mod
| (shift
<< 2);
339 /* scale factor multiply for layer 1 */
343 norm
= ((INT64_C(1) << n
) * FRAC_ONE
) / ((1 << n
) - 1);
344 scale_factor_mult
[i
][0] = MULL(FIXR(1.0 * 2.0), norm
, FRAC_BITS
);
345 scale_factor_mult
[i
][1] = MULL(FIXR(0.7937005259 * 2.0), norm
, FRAC_BITS
);
346 scale_factor_mult
[i
][2] = MULL(FIXR(0.6299605249 * 2.0), norm
, FRAC_BITS
);
347 dprintf(avctx
, "%d: norm=%x s=%x %x %x\n",
349 scale_factor_mult
[i
][0],
350 scale_factor_mult
[i
][1],
351 scale_factor_mult
[i
][2]);
354 ff_mpa_synth_init(window
);
356 /* huffman decode tables */
359 const HuffTable
*h
= &mpa_huff_tables
[i
];
362 uint8_t tmp_bits
[512];
363 uint16_t tmp_codes
[512];
365 memset(tmp_bits
, 0, sizeof(tmp_bits
));
366 memset(tmp_codes
, 0, sizeof(tmp_codes
));
372 for(x
=0;x
<xsize
;x
++) {
373 for(y
=0;y
<xsize
;y
++){
374 tmp_bits
[(x
<< 5) | y
| ((x
&&y
)<<4)]= h
->bits
[j
];
375 tmp_codes
[(x
<< 5) | y
| ((x
&&y
)<<4)]= h
->codes
[j
++];
380 huff_vlc
[i
].table
= huff_vlc_tables
+offset
;
381 huff_vlc
[i
].table_allocated
= huff_vlc_tables_sizes
[i
];
382 init_vlc(&huff_vlc
[i
], 7, 512,
383 tmp_bits
, 1, 1, tmp_codes
, 2, 2,
384 INIT_VLC_USE_NEW_STATIC
);
385 offset
+= huff_vlc_tables_sizes
[i
];
387 assert(offset
== FF_ARRAY_ELEMS(huff_vlc_tables
));
391 huff_quad_vlc
[i
].table
= huff_quad_vlc_tables
+offset
;
392 huff_quad_vlc
[i
].table_allocated
= huff_quad_vlc_tables_sizes
[i
];
393 init_vlc(&huff_quad_vlc
[i
], i
== 0 ? 7 : 4, 16,
394 mpa_quad_bits
[i
], 1, 1, mpa_quad_codes
[i
], 1, 1,
395 INIT_VLC_USE_NEW_STATIC
);
396 offset
+= huff_quad_vlc_tables_sizes
[i
];
398 assert(offset
== FF_ARRAY_ELEMS(huff_quad_vlc_tables
));
403 band_index_long
[i
][j
] = k
;
404 k
+= band_size_long
[i
][j
];
406 band_index_long
[i
][22] = k
;
409 /* compute n ^ (4/3) and store it in mantissa/exp format */
412 for(i
=1;i
<TABLE_4_3_SIZE
;i
++) {
415 f
= pow((double)(i
/4), 4.0 / 3.0) * pow(2, (i
&3)*0.25);
417 m
= (uint32_t)(fm
*(1LL<<31) + 0.5);
418 e
+= FRAC_BITS
- 31 + 5 - 100;
420 /* normalized to FRAC_BITS */
421 table_4_3_value
[i
] = m
;
422 table_4_3_exp
[i
] = -e
;
424 for(i
=0; i
<512*16; i
++){
425 int exponent
= (i
>>4);
426 double f
= pow(i
&15, 4.0 / 3.0) * pow(2, (exponent
-400)*0.25 + FRAC_BITS
+ 5);
427 expval_table
[exponent
][i
&15]= llrint(f
);
429 exp_table
[exponent
]= llrint(f
);
436 f
= tan((double)i
* M_PI
/ 12.0);
437 v
= FIXR(f
/ (1.0 + f
));
442 is_table
[1][6 - i
] = v
;
446 is_table
[0][i
] = is_table
[1][i
] = 0.0;
453 e
= -(j
+ 1) * ((i
+ 1) >> 1);
454 f
= pow(2.0, e
/ 4.0);
456 is_table_lsf
[j
][k
^ 1][i
] = FIXR(f
);
457 is_table_lsf
[j
][k
][i
] = FIXR(1.0);
458 dprintf(avctx
, "is_table_lsf %d %d: %x %x\n",
459 i
, j
, is_table_lsf
[j
][0][i
], is_table_lsf
[j
][1][i
]);
466 cs
= 1.0 / sqrt(1.0 + ci
* ci
);
468 csa_table
[i
][0] = FIXHR(cs
/4);
469 csa_table
[i
][1] = FIXHR(ca
/4);
470 csa_table
[i
][2] = FIXHR(ca
/4) + FIXHR(cs
/4);
471 csa_table
[i
][3] = FIXHR(ca
/4) - FIXHR(cs
/4);
472 csa_table_float
[i
][0] = cs
;
473 csa_table_float
[i
][1] = ca
;
474 csa_table_float
[i
][2] = ca
+ cs
;
475 csa_table_float
[i
][3] = ca
- cs
;
478 /* compute mdct windows */
486 d
= sin(M_PI
* (i
+ 0.5) / 36.0);
489 else if(i
>=24) d
= sin(M_PI
* (i
- 18 + 0.5) / 12.0);
493 else if(i
< 12) d
= sin(M_PI
* (i
- 6 + 0.5) / 12.0);
496 //merge last stage of imdct into the window coefficients
497 d
*= 0.5 / cos(M_PI
*(2*i
+ 19)/72);
500 mdct_win
[j
][i
/3] = FIXHR((d
/ (1<<5)));
502 mdct_win
[j
][i
] = FIXHR((d
/ (1<<5)));
506 /* NOTE: we do frequency inversion adter the MDCT by changing
507 the sign of the right window coefs */
510 mdct_win
[j
+ 4][i
] = mdct_win
[j
][i
];
511 mdct_win
[j
+ 4][i
+ 1] = -mdct_win
[j
][i
+ 1];
518 if (avctx
->codec_id
== CODEC_ID_MP3ADU
)
523 /* tab[i][j] = 1.0 / (2.0 * cos(pi*(2*k+1) / 2^(6 - j))) */
527 #define COS0_0 FIXHR(0.50060299823519630134/2)
528 #define COS0_1 FIXHR(0.50547095989754365998/2)
529 #define COS0_2 FIXHR(0.51544730992262454697/2)
530 #define COS0_3 FIXHR(0.53104259108978417447/2)
531 #define COS0_4 FIXHR(0.55310389603444452782/2)
532 #define COS0_5 FIXHR(0.58293496820613387367/2)
533 #define COS0_6 FIXHR(0.62250412303566481615/2)
534 #define COS0_7 FIXHR(0.67480834145500574602/2)
535 #define COS0_8 FIXHR(0.74453627100229844977/2)
536 #define COS0_9 FIXHR(0.83934964541552703873/2)
537 #define COS0_10 FIXHR(0.97256823786196069369/2)
538 #define COS0_11 FIXHR(1.16943993343288495515/4)
539 #define COS0_12 FIXHR(1.48416461631416627724/4)
540 #define COS0_13 FIXHR(2.05778100995341155085/8)
541 #define COS0_14 FIXHR(3.40760841846871878570/8)
542 #define COS0_15 FIXHR(10.19000812354805681150/32)
544 #define COS1_0 FIXHR(0.50241928618815570551/2)
545 #define COS1_1 FIXHR(0.52249861493968888062/2)
546 #define COS1_2 FIXHR(0.56694403481635770368/2)
547 #define COS1_3 FIXHR(0.64682178335999012954/2)
548 #define COS1_4 FIXHR(0.78815462345125022473/2)
549 #define COS1_5 FIXHR(1.06067768599034747134/4)
550 #define COS1_6 FIXHR(1.72244709823833392782/4)
551 #define COS1_7 FIXHR(5.10114861868916385802/16)
553 #define COS2_0 FIXHR(0.50979557910415916894/2)
554 #define COS2_1 FIXHR(0.60134488693504528054/2)
555 #define COS2_2 FIXHR(0.89997622313641570463/2)
556 #define COS2_3 FIXHR(2.56291544774150617881/8)
558 #define COS3_0 FIXHR(0.54119610014619698439/2)
559 #define COS3_1 FIXHR(1.30656296487637652785/4)
561 #define COS4_0 FIXHR(0.70710678118654752439/2)
563 /* butterfly operator */
564 #define BF(a, b, c, s)\
566 tmp0 = tab[a] + tab[b];\
567 tmp1 = tab[a] - tab[b];\
569 tab[b] = MULH(tmp1<<(s), c);\
572 #define BF1(a, b, c, d)\
574 BF(a, b, COS4_0, 1);\
575 BF(c, d,-COS4_0, 1);\
579 #define BF2(a, b, c, d)\
581 BF(a, b, COS4_0, 1);\
582 BF(c, d,-COS4_0, 1);\
589 #define ADD(a, b) tab[a] += tab[b]
591 /* DCT32 without 1/sqrt(2) coef zero scaling. */
592 static void dct32(int32_t *out
, int32_t *tab
)
597 BF( 0, 31, COS0_0
, 1);
598 BF(15, 16, COS0_15
, 5);
600 BF( 0, 15, COS1_0
, 1);
601 BF(16, 31,-COS1_0
, 1);
603 BF( 7, 24, COS0_7
, 1);
604 BF( 8, 23, COS0_8
, 1);
606 BF( 7, 8, COS1_7
, 4);
607 BF(23, 24,-COS1_7
, 4);
609 BF( 0, 7, COS2_0
, 1);
610 BF( 8, 15,-COS2_0
, 1);
611 BF(16, 23, COS2_0
, 1);
612 BF(24, 31,-COS2_0
, 1);
614 BF( 3, 28, COS0_3
, 1);
615 BF(12, 19, COS0_12
, 2);
617 BF( 3, 12, COS1_3
, 1);
618 BF(19, 28,-COS1_3
, 1);
620 BF( 4, 27, COS0_4
, 1);
621 BF(11, 20, COS0_11
, 2);
623 BF( 4, 11, COS1_4
, 1);
624 BF(20, 27,-COS1_4
, 1);
626 BF( 3, 4, COS2_3
, 3);
627 BF(11, 12,-COS2_3
, 3);
628 BF(19, 20, COS2_3
, 3);
629 BF(27, 28,-COS2_3
, 3);
631 BF( 0, 3, COS3_0
, 1);
632 BF( 4, 7,-COS3_0
, 1);
633 BF( 8, 11, COS3_0
, 1);
634 BF(12, 15,-COS3_0
, 1);
635 BF(16, 19, COS3_0
, 1);
636 BF(20, 23,-COS3_0
, 1);
637 BF(24, 27, COS3_0
, 1);
638 BF(28, 31,-COS3_0
, 1);
643 BF( 1, 30, COS0_1
, 1);
644 BF(14, 17, COS0_14
, 3);
646 BF( 1, 14, COS1_1
, 1);
647 BF(17, 30,-COS1_1
, 1);
649 BF( 6, 25, COS0_6
, 1);
650 BF( 9, 22, COS0_9
, 1);
652 BF( 6, 9, COS1_6
, 2);
653 BF(22, 25,-COS1_6
, 2);
655 BF( 1, 6, COS2_1
, 1);
656 BF( 9, 14,-COS2_1
, 1);
657 BF(17, 22, COS2_1
, 1);
658 BF(25, 30,-COS2_1
, 1);
661 BF( 2, 29, COS0_2
, 1);
662 BF(13, 18, COS0_13
, 3);
664 BF( 2, 13, COS1_2
, 1);
665 BF(18, 29,-COS1_2
, 1);
667 BF( 5, 26, COS0_5
, 1);
668 BF(10, 21, COS0_10
, 1);
670 BF( 5, 10, COS1_5
, 2);
671 BF(21, 26,-COS1_5
, 2);
673 BF( 2, 5, COS2_2
, 1);
674 BF(10, 13,-COS2_2
, 1);
675 BF(18, 21, COS2_2
, 1);
676 BF(26, 29,-COS2_2
, 1);
678 BF( 1, 2, COS3_1
, 2);
679 BF( 5, 6,-COS3_1
, 2);
680 BF( 9, 10, COS3_1
, 2);
681 BF(13, 14,-COS3_1
, 2);
682 BF(17, 18, COS3_1
, 2);
683 BF(21, 22,-COS3_1
, 2);
684 BF(25, 26, COS3_1
, 2);
685 BF(29, 30,-COS3_1
, 2);
732 out
[ 1] = tab
[16] + tab
[24];
733 out
[17] = tab
[17] + tab
[25];
734 out
[ 9] = tab
[18] + tab
[26];
735 out
[25] = tab
[19] + tab
[27];
736 out
[ 5] = tab
[20] + tab
[28];
737 out
[21] = tab
[21] + tab
[29];
738 out
[13] = tab
[22] + tab
[30];
739 out
[29] = tab
[23] + tab
[31];
740 out
[ 3] = tab
[24] + tab
[20];
741 out
[19] = tab
[25] + tab
[21];
742 out
[11] = tab
[26] + tab
[22];
743 out
[27] = tab
[27] + tab
[23];
744 out
[ 7] = tab
[28] + tab
[18];
745 out
[23] = tab
[29] + tab
[19];
746 out
[15] = tab
[30] + tab
[17];
752 static inline int round_sample(int *sum
)
755 sum1
= (*sum
) >> OUT_SHIFT
;
756 *sum
&= (1<<OUT_SHIFT
)-1;
759 else if (sum1
> OUT_MAX
)
764 /* signed 16x16 -> 32 multiply add accumulate */
765 #define MACS(rt, ra, rb) MAC16(rt, ra, rb)
767 /* signed 16x16 -> 32 multiply */
768 #define MULS(ra, rb) MUL16(ra, rb)
770 #define MLSS(rt, ra, rb) MLS16(rt, ra, rb)
774 static inline int round_sample(int64_t *sum
)
777 sum1
= (int)((*sum
) >> OUT_SHIFT
);
778 *sum
&= (1<<OUT_SHIFT
)-1;
781 else if (sum1
> OUT_MAX
)
786 # define MULS(ra, rb) MUL64(ra, rb)
787 # define MACS(rt, ra, rb) MAC64(rt, ra, rb)
788 # define MLSS(rt, ra, rb) MLS64(rt, ra, rb)
791 #define SUM8(op, sum, w, p) \
793 op(sum, (w)[0 * 64], p[0 * 64]); \
794 op(sum, (w)[1 * 64], p[1 * 64]); \
795 op(sum, (w)[2 * 64], p[2 * 64]); \
796 op(sum, (w)[3 * 64], p[3 * 64]); \
797 op(sum, (w)[4 * 64], p[4 * 64]); \
798 op(sum, (w)[5 * 64], p[5 * 64]); \
799 op(sum, (w)[6 * 64], p[6 * 64]); \
800 op(sum, (w)[7 * 64], p[7 * 64]); \
803 #define SUM8P2(sum1, op1, sum2, op2, w1, w2, p) \
807 op1(sum1, (w1)[0 * 64], tmp);\
808 op2(sum2, (w2)[0 * 64], tmp);\
810 op1(sum1, (w1)[1 * 64], tmp);\
811 op2(sum2, (w2)[1 * 64], tmp);\
813 op1(sum1, (w1)[2 * 64], tmp);\
814 op2(sum2, (w2)[2 * 64], tmp);\
816 op1(sum1, (w1)[3 * 64], tmp);\
817 op2(sum2, (w2)[3 * 64], tmp);\
819 op1(sum1, (w1)[4 * 64], tmp);\
820 op2(sum2, (w2)[4 * 64], tmp);\
822 op1(sum1, (w1)[5 * 64], tmp);\
823 op2(sum2, (w2)[5 * 64], tmp);\
825 op1(sum1, (w1)[6 * 64], tmp);\
826 op2(sum2, (w2)[6 * 64], tmp);\
828 op1(sum1, (w1)[7 * 64], tmp);\
829 op2(sum2, (w2)[7 * 64], tmp);\
832 void ff_mpa_synth_init(MPA_INT
*window
)
836 /* max = 18760, max sum over all 16 coefs : 44736 */
839 v
= ff_mpa_enwindow
[i
];
841 v
= (v
+ (1 << (16 - WFRAC_BITS
- 1))) >> (16 - WFRAC_BITS
);
851 /* 32 sub band synthesis filter. Input: 32 sub band samples, Output:
853 /* XXX: optimize by avoiding ring buffer usage */
854 void ff_mpa_synth_filter(MPA_INT
*synth_buf_ptr
, int *synth_buf_offset
,
855 MPA_INT
*window
, int *dither_state
,
856 OUT_INT
*samples
, int incr
,
857 int32_t sb_samples
[SBLIMIT
])
860 register MPA_INT
*synth_buf
;
861 register const MPA_INT
*w
, *w2
, *p
;
870 dct32(tmp
, sb_samples
);
872 offset
= *synth_buf_offset
;
873 synth_buf
= synth_buf_ptr
+ offset
;
878 /* NOTE: can cause a loss in precision if very high amplitude
880 v
= av_clip_int16(v
);
884 /* copy to avoid wrap */
885 memcpy(synth_buf
+ 512, synth_buf
, 32 * sizeof(MPA_INT
));
887 samples2
= samples
+ 31 * incr
;
893 SUM8(MACS
, sum
, w
, p
);
895 SUM8(MLSS
, sum
, w
+ 32, p
);
896 *samples
= round_sample(&sum
);
900 /* we calculate two samples at the same time to avoid one memory
901 access per two sample */
904 p
= synth_buf
+ 16 + j
;
905 SUM8P2(sum
, MACS
, sum2
, MLSS
, w
, w2
, p
);
906 p
= synth_buf
+ 48 - j
;
907 SUM8P2(sum
, MLSS
, sum2
, MLSS
, w
+ 32, w2
+ 32, p
);
909 *samples
= round_sample(&sum
);
912 *samples2
= round_sample(&sum
);
919 SUM8(MLSS
, sum
, w
+ 32, p
);
920 *samples
= round_sample(&sum
);
923 offset
= (offset
- 32) & 511;
924 *synth_buf_offset
= offset
;
927 #define C3 FIXHR(0.86602540378443864676/2)
929 /* 0.5 / cos(pi*(2*i+1)/36) */
930 static const int icos36
[9] = {
931 FIXR(0.50190991877167369479),
932 FIXR(0.51763809020504152469), //0
933 FIXR(0.55168895948124587824),
934 FIXR(0.61038729438072803416),
935 FIXR(0.70710678118654752439), //1
936 FIXR(0.87172339781054900991),
937 FIXR(1.18310079157624925896),
938 FIXR(1.93185165257813657349), //2
939 FIXR(5.73685662283492756461),
942 /* 0.5 / cos(pi*(2*i+1)/36) */
943 static const int icos36h
[9] = {
944 FIXHR(0.50190991877167369479/2),
945 FIXHR(0.51763809020504152469/2), //0
946 FIXHR(0.55168895948124587824/2),
947 FIXHR(0.61038729438072803416/2),
948 FIXHR(0.70710678118654752439/2), //1
949 FIXHR(0.87172339781054900991/2),
950 FIXHR(1.18310079157624925896/4),
951 FIXHR(1.93185165257813657349/4), //2
952 // FIXHR(5.73685662283492756461),
955 /* 12 points IMDCT. We compute it "by hand" by factorizing obvious
957 static void imdct12(int *out
, int *in
)
959 int in0
, in1
, in2
, in3
, in4
, in5
, t1
, t2
;
962 in1
= in
[1*3] + in
[0*3];
963 in2
= in
[2*3] + in
[1*3];
964 in3
= in
[3*3] + in
[2*3];
965 in4
= in
[4*3] + in
[3*3];
966 in5
= in
[5*3] + in
[4*3];
970 in2
= MULH(2*in2
, C3
);
971 in3
= MULH(4*in3
, C3
);
974 t2
= MULH(2*(in1
- in5
), icos36h
[4]);
984 in1
= MULH(in5
+ in3
, icos36h
[1]);
991 in5
= MULH(2*(in5
- in3
), icos36h
[7]);
999 #define C1 FIXHR(0.98480775301220805936/2)
1000 #define C2 FIXHR(0.93969262078590838405/2)
1001 #define C3 FIXHR(0.86602540378443864676/2)
1002 #define C4 FIXHR(0.76604444311897803520/2)
1003 #define C5 FIXHR(0.64278760968653932632/2)
1004 #define C6 FIXHR(0.5/2)
1005 #define C7 FIXHR(0.34202014332566873304/2)
1006 #define C8 FIXHR(0.17364817766693034885/2)
1009 /* using Lee like decomposition followed by hand coded 9 points DCT */
1010 static void imdct36(int *out
, int *buf
, int *in
, int *win
)
1012 int i
, j
, t0
, t1
, t2
, t3
, s0
, s1
, s2
, s3
;
1013 int tmp
[18], *tmp1
, *in1
;
1024 //more accurate but slower
1025 int64_t t0
, t1
, t2
, t3
;
1026 t2
= in1
[2*4] + in1
[2*8] - in1
[2*2];
1028 t3
= (in1
[2*0] + (int64_t)(in1
[2*6]>>1))<<32;
1029 t1
= in1
[2*0] - in1
[2*6];
1030 tmp1
[ 6] = t1
- (t2
>>1);
1033 t0
= MUL64(2*(in1
[2*2] + in1
[2*4]), C2
);
1034 t1
= MUL64( in1
[2*4] - in1
[2*8] , -2*C8
);
1035 t2
= MUL64(2*(in1
[2*2] + in1
[2*8]), -C4
);
1037 tmp1
[10] = (t3
- t0
- t2
) >> 32;
1038 tmp1
[ 2] = (t3
+ t0
+ t1
) >> 32;
1039 tmp1
[14] = (t3
+ t2
- t1
) >> 32;
1041 tmp1
[ 4] = MULH(2*(in1
[2*5] + in1
[2*7] - in1
[2*1]), -C3
);
1042 t2
= MUL64(2*(in1
[2*1] + in1
[2*5]), C1
);
1043 t3
= MUL64( in1
[2*5] - in1
[2*7] , -2*C7
);
1044 t0
= MUL64(2*in1
[2*3], C3
);
1046 t1
= MUL64(2*(in1
[2*1] + in1
[2*7]), -C5
);
1048 tmp1
[ 0] = (t2
+ t3
+ t0
) >> 32;
1049 tmp1
[12] = (t2
+ t1
- t0
) >> 32;
1050 tmp1
[ 8] = (t3
- t1
- t0
) >> 32;
1052 t2
= in1
[2*4] + in1
[2*8] - in1
[2*2];
1054 t3
= in1
[2*0] + (in1
[2*6]>>1);
1055 t1
= in1
[2*0] - in1
[2*6];
1056 tmp1
[ 6] = t1
- (t2
>>1);
1059 t0
= MULH(2*(in1
[2*2] + in1
[2*4]), C2
);
1060 t1
= MULH( in1
[2*4] - in1
[2*8] , -2*C8
);
1061 t2
= MULH(2*(in1
[2*2] + in1
[2*8]), -C4
);
1063 tmp1
[10] = t3
- t0
- t2
;
1064 tmp1
[ 2] = t3
+ t0
+ t1
;
1065 tmp1
[14] = t3
+ t2
- t1
;
1067 tmp1
[ 4] = MULH(2*(in1
[2*5] + in1
[2*7] - in1
[2*1]), -C3
);
1068 t2
= MULH(2*(in1
[2*1] + in1
[2*5]), C1
);
1069 t3
= MULH( in1
[2*5] - in1
[2*7] , -2*C7
);
1070 t0
= MULH(2*in1
[2*3], C3
);
1072 t1
= MULH(2*(in1
[2*1] + in1
[2*7]), -C5
);
1074 tmp1
[ 0] = t2
+ t3
+ t0
;
1075 tmp1
[12] = t2
+ t1
- t0
;
1076 tmp1
[ 8] = t3
- t1
- t0
;
1089 s1
= MULH(2*(t3
+ t2
), icos36h
[j
]);
1090 s3
= MULL(t3
- t2
, icos36
[8 - j
], FRAC_BITS
);
1094 out
[(9 + j
)*SBLIMIT
] = MULH(t1
, win
[9 + j
]) + buf
[9 + j
];
1095 out
[(8 - j
)*SBLIMIT
] = MULH(t1
, win
[8 - j
]) + buf
[8 - j
];
1096 buf
[9 + j
] = MULH(t0
, win
[18 + 9 + j
]);
1097 buf
[8 - j
] = MULH(t0
, win
[18 + 8 - j
]);
1101 out
[(9 + 8 - j
)*SBLIMIT
] = MULH(t1
, win
[9 + 8 - j
]) + buf
[9 + 8 - j
];
1102 out
[( j
)*SBLIMIT
] = MULH(t1
, win
[ j
]) + buf
[ j
];
1103 buf
[9 + 8 - j
] = MULH(t0
, win
[18 + 9 + 8 - j
]);
1104 buf
[ + j
] = MULH(t0
, win
[18 + j
]);
1109 s1
= MULH(2*tmp
[17], icos36h
[4]);
1112 out
[(9 + 4)*SBLIMIT
] = MULH(t1
, win
[9 + 4]) + buf
[9 + 4];
1113 out
[(8 - 4)*SBLIMIT
] = MULH(t1
, win
[8 - 4]) + buf
[8 - 4];
1114 buf
[9 + 4] = MULH(t0
, win
[18 + 9 + 4]);
1115 buf
[8 - 4] = MULH(t0
, win
[18 + 8 - 4]);
1118 /* return the number of decoded frames */
1119 static int mp_decode_layer1(MPADecodeContext
*s
)
1121 int bound
, i
, v
, n
, ch
, j
, mant
;
1122 uint8_t allocation
[MPA_MAX_CHANNELS
][SBLIMIT
];
1123 uint8_t scale_factors
[MPA_MAX_CHANNELS
][SBLIMIT
];
1125 if (s
->mode
== MPA_JSTEREO
)
1126 bound
= (s
->mode_ext
+ 1) * 4;
1130 /* allocation bits */
1131 for(i
=0;i
<bound
;i
++) {
1132 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1133 allocation
[ch
][i
] = get_bits(&s
->gb
, 4);
1136 for(i
=bound
;i
<SBLIMIT
;i
++) {
1137 allocation
[0][i
] = get_bits(&s
->gb
, 4);
1141 for(i
=0;i
<bound
;i
++) {
1142 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1143 if (allocation
[ch
][i
])
1144 scale_factors
[ch
][i
] = get_bits(&s
->gb
, 6);
1147 for(i
=bound
;i
<SBLIMIT
;i
++) {
1148 if (allocation
[0][i
]) {
1149 scale_factors
[0][i
] = get_bits(&s
->gb
, 6);
1150 scale_factors
[1][i
] = get_bits(&s
->gb
, 6);
1154 /* compute samples */
1156 for(i
=0;i
<bound
;i
++) {
1157 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1158 n
= allocation
[ch
][i
];
1160 mant
= get_bits(&s
->gb
, n
+ 1);
1161 v
= l1_unscale(n
, mant
, scale_factors
[ch
][i
]);
1165 s
->sb_samples
[ch
][j
][i
] = v
;
1168 for(i
=bound
;i
<SBLIMIT
;i
++) {
1169 n
= allocation
[0][i
];
1171 mant
= get_bits(&s
->gb
, n
+ 1);
1172 v
= l1_unscale(n
, mant
, scale_factors
[0][i
]);
1173 s
->sb_samples
[0][j
][i
] = v
;
1174 v
= l1_unscale(n
, mant
, scale_factors
[1][i
]);
1175 s
->sb_samples
[1][j
][i
] = v
;
1177 s
->sb_samples
[0][j
][i
] = 0;
1178 s
->sb_samples
[1][j
][i
] = 0;
1185 static int mp_decode_layer2(MPADecodeContext
*s
)
1187 int sblimit
; /* number of used subbands */
1188 const unsigned char *alloc_table
;
1189 int table
, bit_alloc_bits
, i
, j
, ch
, bound
, v
;
1190 unsigned char bit_alloc
[MPA_MAX_CHANNELS
][SBLIMIT
];
1191 unsigned char scale_code
[MPA_MAX_CHANNELS
][SBLIMIT
];
1192 unsigned char scale_factors
[MPA_MAX_CHANNELS
][SBLIMIT
][3], *sf
;
1193 int scale
, qindex
, bits
, steps
, k
, l
, m
, b
;
1195 /* select decoding table */
1196 table
= ff_mpa_l2_select_table(s
->bit_rate
/ 1000, s
->nb_channels
,
1197 s
->sample_rate
, s
->lsf
);
1198 sblimit
= ff_mpa_sblimit_table
[table
];
1199 alloc_table
= ff_mpa_alloc_tables
[table
];
1201 if (s
->mode
== MPA_JSTEREO
)
1202 bound
= (s
->mode_ext
+ 1) * 4;
1206 dprintf(s
->avctx
, "bound=%d sblimit=%d\n", bound
, sblimit
);
1209 if( bound
> sblimit
) bound
= sblimit
;
1211 /* parse bit allocation */
1213 for(i
=0;i
<bound
;i
++) {
1214 bit_alloc_bits
= alloc_table
[j
];
1215 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1216 bit_alloc
[ch
][i
] = get_bits(&s
->gb
, bit_alloc_bits
);
1218 j
+= 1 << bit_alloc_bits
;
1220 for(i
=bound
;i
<sblimit
;i
++) {
1221 bit_alloc_bits
= alloc_table
[j
];
1222 v
= get_bits(&s
->gb
, bit_alloc_bits
);
1223 bit_alloc
[0][i
] = v
;
1224 bit_alloc
[1][i
] = v
;
1225 j
+= 1 << bit_alloc_bits
;
1229 for(i
=0;i
<sblimit
;i
++) {
1230 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1231 if (bit_alloc
[ch
][i
])
1232 scale_code
[ch
][i
] = get_bits(&s
->gb
, 2);
1237 for(i
=0;i
<sblimit
;i
++) {
1238 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1239 if (bit_alloc
[ch
][i
]) {
1240 sf
= scale_factors
[ch
][i
];
1241 switch(scale_code
[ch
][i
]) {
1244 sf
[0] = get_bits(&s
->gb
, 6);
1245 sf
[1] = get_bits(&s
->gb
, 6);
1246 sf
[2] = get_bits(&s
->gb
, 6);
1249 sf
[0] = get_bits(&s
->gb
, 6);
1254 sf
[0] = get_bits(&s
->gb
, 6);
1255 sf
[2] = get_bits(&s
->gb
, 6);
1259 sf
[0] = get_bits(&s
->gb
, 6);
1260 sf
[2] = get_bits(&s
->gb
, 6);
1270 for(l
=0;l
<12;l
+=3) {
1272 for(i
=0;i
<bound
;i
++) {
1273 bit_alloc_bits
= alloc_table
[j
];
1274 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1275 b
= bit_alloc
[ch
][i
];
1277 scale
= scale_factors
[ch
][i
][k
];
1278 qindex
= alloc_table
[j
+b
];
1279 bits
= ff_mpa_quant_bits
[qindex
];
1281 /* 3 values at the same time */
1282 v
= get_bits(&s
->gb
, -bits
);
1283 steps
= ff_mpa_quant_steps
[qindex
];
1284 s
->sb_samples
[ch
][k
* 12 + l
+ 0][i
] =
1285 l2_unscale_group(steps
, v
% steps
, scale
);
1287 s
->sb_samples
[ch
][k
* 12 + l
+ 1][i
] =
1288 l2_unscale_group(steps
, v
% steps
, scale
);
1290 s
->sb_samples
[ch
][k
* 12 + l
+ 2][i
] =
1291 l2_unscale_group(steps
, v
, scale
);
1294 v
= get_bits(&s
->gb
, bits
);
1295 v
= l1_unscale(bits
- 1, v
, scale
);
1296 s
->sb_samples
[ch
][k
* 12 + l
+ m
][i
] = v
;
1300 s
->sb_samples
[ch
][k
* 12 + l
+ 0][i
] = 0;
1301 s
->sb_samples
[ch
][k
* 12 + l
+ 1][i
] = 0;
1302 s
->sb_samples
[ch
][k
* 12 + l
+ 2][i
] = 0;
1305 /* next subband in alloc table */
1306 j
+= 1 << bit_alloc_bits
;
1308 /* XXX: find a way to avoid this duplication of code */
1309 for(i
=bound
;i
<sblimit
;i
++) {
1310 bit_alloc_bits
= alloc_table
[j
];
1311 b
= bit_alloc
[0][i
];
1313 int mant
, scale0
, scale1
;
1314 scale0
= scale_factors
[0][i
][k
];
1315 scale1
= scale_factors
[1][i
][k
];
1316 qindex
= alloc_table
[j
+b
];
1317 bits
= ff_mpa_quant_bits
[qindex
];
1319 /* 3 values at the same time */
1320 v
= get_bits(&s
->gb
, -bits
);
1321 steps
= ff_mpa_quant_steps
[qindex
];
1324 s
->sb_samples
[0][k
* 12 + l
+ 0][i
] =
1325 l2_unscale_group(steps
, mant
, scale0
);
1326 s
->sb_samples
[1][k
* 12 + l
+ 0][i
] =
1327 l2_unscale_group(steps
, mant
, scale1
);
1330 s
->sb_samples
[0][k
* 12 + l
+ 1][i
] =
1331 l2_unscale_group(steps
, mant
, scale0
);
1332 s
->sb_samples
[1][k
* 12 + l
+ 1][i
] =
1333 l2_unscale_group(steps
, mant
, scale1
);
1334 s
->sb_samples
[0][k
* 12 + l
+ 2][i
] =
1335 l2_unscale_group(steps
, v
, scale0
);
1336 s
->sb_samples
[1][k
* 12 + l
+ 2][i
] =
1337 l2_unscale_group(steps
, v
, scale1
);
1340 mant
= get_bits(&s
->gb
, bits
);
1341 s
->sb_samples
[0][k
* 12 + l
+ m
][i
] =
1342 l1_unscale(bits
- 1, mant
, scale0
);
1343 s
->sb_samples
[1][k
* 12 + l
+ m
][i
] =
1344 l1_unscale(bits
- 1, mant
, scale1
);
1348 s
->sb_samples
[0][k
* 12 + l
+ 0][i
] = 0;
1349 s
->sb_samples
[0][k
* 12 + l
+ 1][i
] = 0;
1350 s
->sb_samples
[0][k
* 12 + l
+ 2][i
] = 0;
1351 s
->sb_samples
[1][k
* 12 + l
+ 0][i
] = 0;
1352 s
->sb_samples
[1][k
* 12 + l
+ 1][i
] = 0;
1353 s
->sb_samples
[1][k
* 12 + l
+ 2][i
] = 0;
1355 /* next subband in alloc table */
1356 j
+= 1 << bit_alloc_bits
;
1358 /* fill remaining samples to zero */
1359 for(i
=sblimit
;i
<SBLIMIT
;i
++) {
1360 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1361 s
->sb_samples
[ch
][k
* 12 + l
+ 0][i
] = 0;
1362 s
->sb_samples
[ch
][k
* 12 + l
+ 1][i
] = 0;
1363 s
->sb_samples
[ch
][k
* 12 + l
+ 2][i
] = 0;
1371 static inline void lsf_sf_expand(int *slen
,
1372 int sf
, int n1
, int n2
, int n3
)
1391 static void exponents_from_scale_factors(MPADecodeContext
*s
,
1395 const uint8_t *bstab
, *pretab
;
1396 int len
, i
, j
, k
, l
, v0
, shift
, gain
, gains
[3];
1399 exp_ptr
= exponents
;
1400 gain
= g
->global_gain
- 210;
1401 shift
= g
->scalefac_scale
+ 1;
1403 bstab
= band_size_long
[s
->sample_rate_index
];
1404 pretab
= mpa_pretab
[g
->preflag
];
1405 for(i
=0;i
<g
->long_end
;i
++) {
1406 v0
= gain
- ((g
->scale_factors
[i
] + pretab
[i
]) << shift
) + 400;
1412 if (g
->short_start
< 13) {
1413 bstab
= band_size_short
[s
->sample_rate_index
];
1414 gains
[0] = gain
- (g
->subblock_gain
[0] << 3);
1415 gains
[1] = gain
- (g
->subblock_gain
[1] << 3);
1416 gains
[2] = gain
- (g
->subblock_gain
[2] << 3);
1418 for(i
=g
->short_start
;i
<13;i
++) {
1421 v0
= gains
[l
] - (g
->scale_factors
[k
++] << shift
) + 400;
1429 /* handle n = 0 too */
1430 static inline int get_bitsz(GetBitContext
*s
, int n
)
1435 return get_bits(s
, n
);
1439 static void switch_buffer(MPADecodeContext
*s
, int *pos
, int *end_pos
, int *end_pos2
){
1440 if(s
->in_gb
.buffer
&& *pos
>= s
->gb
.size_in_bits
){
1442 s
->in_gb
.buffer
=NULL
;
1443 assert((get_bits_count(&s
->gb
) & 7) == 0);
1444 skip_bits_long(&s
->gb
, *pos
- *end_pos
);
1446 *end_pos
= *end_pos2
+ get_bits_count(&s
->gb
) - *pos
;
1447 *pos
= get_bits_count(&s
->gb
);
1451 static int huffman_decode(MPADecodeContext
*s
, GranuleDef
*g
,
1452 int16_t *exponents
, int end_pos2
)
1456 int last_pos
, bits_left
;
1458 int end_pos
= FFMIN(end_pos2
, s
->gb
.size_in_bits
);
1460 /* low frequencies (called big values) */
1463 int j
, k
, l
, linbits
;
1464 j
= g
->region_size
[i
];
1467 /* select vlc table */
1468 k
= g
->table_select
[i
];
1469 l
= mpa_huff_data
[k
][0];
1470 linbits
= mpa_huff_data
[k
][1];
1474 memset(&g
->sb_hybrid
[s_index
], 0, sizeof(*g
->sb_hybrid
)*2*j
);
1479 /* read huffcode and compute each couple */
1481 int exponent
, x
, y
, v
;
1482 int pos
= get_bits_count(&s
->gb
);
1484 if (pos
>= end_pos
){
1485 // av_log(NULL, AV_LOG_ERROR, "pos: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1486 switch_buffer(s
, &pos
, &end_pos
, &end_pos2
);
1487 // av_log(NULL, AV_LOG_ERROR, "new pos: %d %d\n", pos, end_pos);
1491 y
= get_vlc2(&s
->gb
, vlc
->table
, 7, 3);
1494 g
->sb_hybrid
[s_index
] =
1495 g
->sb_hybrid
[s_index
+1] = 0;
1500 exponent
= exponents
[s_index
];
1502 dprintf(s
->avctx
, "region=%d n=%d x=%d y=%d exp=%d\n",
1503 i
, g
->region_size
[i
] - j
, x
, y
, exponent
);
1508 v
= expval_table
[ exponent
][ x
];
1509 // v = expval_table[ (exponent&3) ][ x ] >> FFMIN(0 - (exponent>>2), 31);
1511 x
+= get_bitsz(&s
->gb
, linbits
);
1512 v
= l3_unscale(x
, exponent
);
1514 if (get_bits1(&s
->gb
))
1516 g
->sb_hybrid
[s_index
] = v
;
1518 v
= expval_table
[ exponent
][ y
];
1520 y
+= get_bitsz(&s
->gb
, linbits
);
1521 v
= l3_unscale(y
, exponent
);
1523 if (get_bits1(&s
->gb
))
1525 g
->sb_hybrid
[s_index
+1] = v
;
1531 v
= expval_table
[ exponent
][ x
];
1533 x
+= get_bitsz(&s
->gb
, linbits
);
1534 v
= l3_unscale(x
, exponent
);
1536 if (get_bits1(&s
->gb
))
1538 g
->sb_hybrid
[s_index
+!!y
] = v
;
1539 g
->sb_hybrid
[s_index
+ !y
] = 0;
1545 /* high frequencies */
1546 vlc
= &huff_quad_vlc
[g
->count1table_select
];
1548 while (s_index
<= 572) {
1550 pos
= get_bits_count(&s
->gb
);
1551 if (pos
>= end_pos
) {
1552 if (pos
> end_pos2
&& last_pos
){
1553 /* some encoders generate an incorrect size for this
1554 part. We must go back into the data */
1556 skip_bits_long(&s
->gb
, last_pos
- pos
);
1557 av_log(s
->avctx
, AV_LOG_INFO
, "overread, skip %d enddists: %d %d\n", last_pos
- pos
, end_pos
-pos
, end_pos2
-pos
);
1558 if(s
->error_recognition
>= FF_ER_COMPLIANT
)
1562 // av_log(NULL, AV_LOG_ERROR, "pos2: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1563 switch_buffer(s
, &pos
, &end_pos
, &end_pos2
);
1564 // av_log(NULL, AV_LOG_ERROR, "new pos2: %d %d %d\n", pos, end_pos, s_index);
1570 code
= get_vlc2(&s
->gb
, vlc
->table
, vlc
->bits
, 1);
1571 dprintf(s
->avctx
, "t=%d code=%d\n", g
->count1table_select
, code
);
1572 g
->sb_hybrid
[s_index
+0]=
1573 g
->sb_hybrid
[s_index
+1]=
1574 g
->sb_hybrid
[s_index
+2]=
1575 g
->sb_hybrid
[s_index
+3]= 0;
1577 static const int idxtab
[16]={3,3,2,2,1,1,1,1,0,0,0,0,0,0,0,0};
1579 int pos
= s_index
+idxtab
[code
];
1580 code
^= 8>>idxtab
[code
];
1581 v
= exp_table
[ exponents
[pos
] ];
1582 // v = exp_table[ (exponents[pos]&3) ] >> FFMIN(0 - (exponents[pos]>>2), 31);
1583 if(get_bits1(&s
->gb
))
1585 g
->sb_hybrid
[pos
] = v
;
1589 /* skip extension bits */
1590 bits_left
= end_pos2
- get_bits_count(&s
->gb
);
1591 //av_log(NULL, AV_LOG_ERROR, "left:%d buf:%p\n", bits_left, s->in_gb.buffer);
1592 if (bits_left
< 0 && s
->error_recognition
>= FF_ER_COMPLIANT
) {
1593 av_log(s
->avctx
, AV_LOG_ERROR
, "bits_left=%d\n", bits_left
);
1595 }else if(bits_left
> 0 && s
->error_recognition
>= FF_ER_AGGRESSIVE
){
1596 av_log(s
->avctx
, AV_LOG_ERROR
, "bits_left=%d\n", bits_left
);
1599 memset(&g
->sb_hybrid
[s_index
], 0, sizeof(*g
->sb_hybrid
)*(576 - s_index
));
1600 skip_bits_long(&s
->gb
, bits_left
);
1602 i
= get_bits_count(&s
->gb
);
1603 switch_buffer(s
, &i
, &end_pos
, &end_pos2
);
1608 /* Reorder short blocks from bitstream order to interleaved order. It
1609 would be faster to do it in parsing, but the code would be far more
1611 static void reorder_block(MPADecodeContext
*s
, GranuleDef
*g
)
1614 int32_t *ptr
, *dst
, *ptr1
;
1617 if (g
->block_type
!= 2)
1620 if (g
->switch_point
) {
1621 if (s
->sample_rate_index
!= 8) {
1622 ptr
= g
->sb_hybrid
+ 36;
1624 ptr
= g
->sb_hybrid
+ 48;
1630 for(i
=g
->short_start
;i
<13;i
++) {
1631 len
= band_size_short
[s
->sample_rate_index
][i
];
1634 for(j
=len
;j
>0;j
--) {
1635 *dst
++ = ptr
[0*len
];
1636 *dst
++ = ptr
[1*len
];
1637 *dst
++ = ptr
[2*len
];
1641 memcpy(ptr1
, tmp
, len
* 3 * sizeof(*ptr1
));
1645 #define ISQRT2 FIXR(0.70710678118654752440)
1647 static void compute_stereo(MPADecodeContext
*s
,
1648 GranuleDef
*g0
, GranuleDef
*g1
)
1652 int sf_max
, tmp0
, tmp1
, sf
, len
, non_zero_found
;
1653 int32_t (*is_tab
)[16];
1654 int32_t *tab0
, *tab1
;
1655 int non_zero_found_short
[3];
1657 /* intensity stereo */
1658 if (s
->mode_ext
& MODE_EXT_I_STEREO
) {
1663 is_tab
= is_table_lsf
[g1
->scalefac_compress
& 1];
1667 tab0
= g0
->sb_hybrid
+ 576;
1668 tab1
= g1
->sb_hybrid
+ 576;
1670 non_zero_found_short
[0] = 0;
1671 non_zero_found_short
[1] = 0;
1672 non_zero_found_short
[2] = 0;
1673 k
= (13 - g1
->short_start
) * 3 + g1
->long_end
- 3;
1674 for(i
= 12;i
>= g1
->short_start
;i
--) {
1675 /* for last band, use previous scale factor */
1678 len
= band_size_short
[s
->sample_rate_index
][i
];
1682 if (!non_zero_found_short
[l
]) {
1683 /* test if non zero band. if so, stop doing i-stereo */
1684 for(j
=0;j
<len
;j
++) {
1686 non_zero_found_short
[l
] = 1;
1690 sf
= g1
->scale_factors
[k
+ l
];
1696 for(j
=0;j
<len
;j
++) {
1698 tab0
[j
] = MULL(tmp0
, v1
, FRAC_BITS
);
1699 tab1
[j
] = MULL(tmp0
, v2
, FRAC_BITS
);
1703 if (s
->mode_ext
& MODE_EXT_MS_STEREO
) {
1704 /* lower part of the spectrum : do ms stereo
1706 for(j
=0;j
<len
;j
++) {
1709 tab0
[j
] = MULL(tmp0
+ tmp1
, ISQRT2
, FRAC_BITS
);
1710 tab1
[j
] = MULL(tmp0
- tmp1
, ISQRT2
, FRAC_BITS
);
1717 non_zero_found
= non_zero_found_short
[0] |
1718 non_zero_found_short
[1] |
1719 non_zero_found_short
[2];
1721 for(i
= g1
->long_end
- 1;i
>= 0;i
--) {
1722 len
= band_size_long
[s
->sample_rate_index
][i
];
1725 /* test if non zero band. if so, stop doing i-stereo */
1726 if (!non_zero_found
) {
1727 for(j
=0;j
<len
;j
++) {
1733 /* for last band, use previous scale factor */
1734 k
= (i
== 21) ? 20 : i
;
1735 sf
= g1
->scale_factors
[k
];
1740 for(j
=0;j
<len
;j
++) {
1742 tab0
[j
] = MULL(tmp0
, v1
, FRAC_BITS
);
1743 tab1
[j
] = MULL(tmp0
, v2
, FRAC_BITS
);
1747 if (s
->mode_ext
& MODE_EXT_MS_STEREO
) {
1748 /* lower part of the spectrum : do ms stereo
1750 for(j
=0;j
<len
;j
++) {
1753 tab0
[j
] = MULL(tmp0
+ tmp1
, ISQRT2
, FRAC_BITS
);
1754 tab1
[j
] = MULL(tmp0
- tmp1
, ISQRT2
, FRAC_BITS
);
1759 } else if (s
->mode_ext
& MODE_EXT_MS_STEREO
) {
1760 /* ms stereo ONLY */
1761 /* NOTE: the 1/sqrt(2) normalization factor is included in the
1763 tab0
= g0
->sb_hybrid
;
1764 tab1
= g1
->sb_hybrid
;
1765 for(i
=0;i
<576;i
++) {
1768 tab0
[i
] = tmp0
+ tmp1
;
1769 tab1
[i
] = tmp0
- tmp1
;
1774 static void compute_antialias_integer(MPADecodeContext
*s
,
1780 /* we antialias only "long" bands */
1781 if (g
->block_type
== 2) {
1782 if (!g
->switch_point
)
1784 /* XXX: check this for 8000Hz case */
1790 ptr
= g
->sb_hybrid
+ 18;
1791 for(i
= n
;i
> 0;i
--) {
1792 int tmp0
, tmp1
, tmp2
;
1793 csa
= &csa_table
[0][0];
1797 tmp2= MULH(tmp0 + tmp1, csa[0+4*j]);\
1798 ptr[-1-j] = 4*(tmp2 - MULH(tmp1, csa[2+4*j]));\
1799 ptr[ j] = 4*(tmp2 + MULH(tmp0, csa[3+4*j]));
1814 static void compute_antialias_float(MPADecodeContext
*s
,
1820 /* we antialias only "long" bands */
1821 if (g
->block_type
== 2) {
1822 if (!g
->switch_point
)
1824 /* XXX: check this for 8000Hz case */
1830 ptr
= g
->sb_hybrid
+ 18;
1831 for(i
= n
;i
> 0;i
--) {
1833 float *csa
= &csa_table_float
[0][0];
1834 #define FLOAT_AA(j)\
1837 ptr[-1-j] = lrintf(tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j]);\
1838 ptr[ j] = lrintf(tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j]);
1853 static void compute_imdct(MPADecodeContext
*s
,
1855 int32_t *sb_samples
,
1858 int32_t *ptr
, *win
, *win1
, *buf
, *out_ptr
, *ptr1
;
1860 int i
, j
, mdct_long_end
, v
, sblimit
;
1862 /* find last non zero block */
1863 ptr
= g
->sb_hybrid
+ 576;
1864 ptr1
= g
->sb_hybrid
+ 2 * 18;
1865 while (ptr
>= ptr1
) {
1867 v
= ptr
[0] | ptr
[1] | ptr
[2] | ptr
[3] | ptr
[4] | ptr
[5];
1871 sblimit
= ((ptr
- g
->sb_hybrid
) / 18) + 1;
1873 if (g
->block_type
== 2) {
1874 /* XXX: check for 8000 Hz */
1875 if (g
->switch_point
)
1880 mdct_long_end
= sblimit
;
1885 for(j
=0;j
<mdct_long_end
;j
++) {
1886 /* apply window & overlap with previous buffer */
1887 out_ptr
= sb_samples
+ j
;
1889 if (g
->switch_point
&& j
< 2)
1892 win1
= mdct_win
[g
->block_type
];
1893 /* select frequency inversion */
1894 win
= win1
+ ((4 * 36) & -(j
& 1));
1895 imdct36(out_ptr
, buf
, ptr
, win
);
1896 out_ptr
+= 18*SBLIMIT
;
1900 for(j
=mdct_long_end
;j
<sblimit
;j
++) {
1901 /* select frequency inversion */
1902 win
= mdct_win
[2] + ((4 * 36) & -(j
& 1));
1903 out_ptr
= sb_samples
+ j
;
1909 imdct12(out2
, ptr
+ 0);
1911 *out_ptr
= MULH(out2
[i
], win
[i
]) + buf
[i
+ 6*1];
1912 buf
[i
+ 6*2] = MULH(out2
[i
+ 6], win
[i
+ 6]);
1915 imdct12(out2
, ptr
+ 1);
1917 *out_ptr
= MULH(out2
[i
], win
[i
]) + buf
[i
+ 6*2];
1918 buf
[i
+ 6*0] = MULH(out2
[i
+ 6], win
[i
+ 6]);
1921 imdct12(out2
, ptr
+ 2);
1923 buf
[i
+ 6*0] = MULH(out2
[i
], win
[i
]) + buf
[i
+ 6*0];
1924 buf
[i
+ 6*1] = MULH(out2
[i
+ 6], win
[i
+ 6]);
1931 for(j
=sblimit
;j
<SBLIMIT
;j
++) {
1933 out_ptr
= sb_samples
+ j
;
1943 /* main layer3 decoding function */
1944 static int mp_decode_layer3(MPADecodeContext
*s
)
1946 int nb_granules
, main_data_begin
, private_bits
;
1947 int gr
, ch
, blocksplit_flag
, i
, j
, k
, n
, bits_pos
;
1948 GranuleDef granules
[2][2], *g
;
1949 int16_t exponents
[576];
1951 /* read side info */
1953 main_data_begin
= get_bits(&s
->gb
, 8);
1954 private_bits
= get_bits(&s
->gb
, s
->nb_channels
);
1957 main_data_begin
= get_bits(&s
->gb
, 9);
1958 if (s
->nb_channels
== 2)
1959 private_bits
= get_bits(&s
->gb
, 3);
1961 private_bits
= get_bits(&s
->gb
, 5);
1963 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1964 granules
[ch
][0].scfsi
= 0; /* all scale factors are transmitted */
1965 granules
[ch
][1].scfsi
= get_bits(&s
->gb
, 4);
1969 for(gr
=0;gr
<nb_granules
;gr
++) {
1970 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1971 dprintf(s
->avctx
, "gr=%d ch=%d: side_info\n", gr
, ch
);
1972 g
= &granules
[ch
][gr
];
1973 g
->part2_3_length
= get_bits(&s
->gb
, 12);
1974 g
->big_values
= get_bits(&s
->gb
, 9);
1975 if(g
->big_values
> 288){
1976 av_log(s
->avctx
, AV_LOG_ERROR
, "big_values too big\n");
1980 g
->global_gain
= get_bits(&s
->gb
, 8);
1981 /* if MS stereo only is selected, we precompute the
1982 1/sqrt(2) renormalization factor */
1983 if ((s
->mode_ext
& (MODE_EXT_MS_STEREO
| MODE_EXT_I_STEREO
)) ==
1985 g
->global_gain
-= 2;
1987 g
->scalefac_compress
= get_bits(&s
->gb
, 9);
1989 g
->scalefac_compress
= get_bits(&s
->gb
, 4);
1990 blocksplit_flag
= get_bits1(&s
->gb
);
1991 if (blocksplit_flag
) {
1992 g
->block_type
= get_bits(&s
->gb
, 2);
1993 if (g
->block_type
== 0){
1994 av_log(s
->avctx
, AV_LOG_ERROR
, "invalid block type\n");
1997 g
->switch_point
= get_bits1(&s
->gb
);
1999 g
->table_select
[i
] = get_bits(&s
->gb
, 5);
2001 g
->subblock_gain
[i
] = get_bits(&s
->gb
, 3);
2002 ff_init_short_region(s
, g
);
2004 int region_address1
, region_address2
;
2006 g
->switch_point
= 0;
2008 g
->table_select
[i
] = get_bits(&s
->gb
, 5);
2009 /* compute huffman coded region sizes */
2010 region_address1
= get_bits(&s
->gb
, 4);
2011 region_address2
= get_bits(&s
->gb
, 3);
2012 dprintf(s
->avctx
, "region1=%d region2=%d\n",
2013 region_address1
, region_address2
);
2014 ff_init_long_region(s
, g
, region_address1
, region_address2
);
2016 ff_region_offset2size(g
);
2017 ff_compute_band_indexes(s
, g
);
2021 g
->preflag
= get_bits1(&s
->gb
);
2022 g
->scalefac_scale
= get_bits1(&s
->gb
);
2023 g
->count1table_select
= get_bits1(&s
->gb
);
2024 dprintf(s
->avctx
, "block_type=%d switch_point=%d\n",
2025 g
->block_type
, g
->switch_point
);
2030 const uint8_t *ptr
= s
->gb
.buffer
+ (get_bits_count(&s
->gb
)>>3);
2031 assert((get_bits_count(&s
->gb
) & 7) == 0);
2032 /* now we get bits from the main_data_begin offset */
2033 dprintf(s
->avctx
, "seekback: %d\n", main_data_begin
);
2034 //av_log(NULL, AV_LOG_ERROR, "backstep:%d, lastbuf:%d\n", main_data_begin, s->last_buf_size);
2036 memcpy(s
->last_buf
+ s
->last_buf_size
, ptr
, EXTRABYTES
);
2038 init_get_bits(&s
->gb
, s
->last_buf
, s
->last_buf_size
*8);
2039 skip_bits_long(&s
->gb
, 8*(s
->last_buf_size
- main_data_begin
));
2042 for(gr
=0;gr
<nb_granules
;gr
++) {
2043 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
2044 g
= &granules
[ch
][gr
];
2045 if(get_bits_count(&s
->gb
)<0){
2046 av_log(s
->avctx
, AV_LOG_ERROR
, "mdb:%d, lastbuf:%d skipping granule %d\n",
2047 main_data_begin
, s
->last_buf_size
, gr
);
2048 skip_bits_long(&s
->gb
, g
->part2_3_length
);
2049 memset(g
->sb_hybrid
, 0, sizeof(g
->sb_hybrid
));
2050 if(get_bits_count(&s
->gb
) >= s
->gb
.size_in_bits
&& s
->in_gb
.buffer
){
2051 skip_bits_long(&s
->in_gb
, get_bits_count(&s
->gb
) - s
->gb
.size_in_bits
);
2053 s
->in_gb
.buffer
=NULL
;
2058 bits_pos
= get_bits_count(&s
->gb
);
2062 int slen
, slen1
, slen2
;
2064 /* MPEG1 scale factors */
2065 slen1
= slen_table
[0][g
->scalefac_compress
];
2066 slen2
= slen_table
[1][g
->scalefac_compress
];
2067 dprintf(s
->avctx
, "slen1=%d slen2=%d\n", slen1
, slen2
);
2068 if (g
->block_type
== 2) {
2069 n
= g
->switch_point
? 17 : 18;
2073 g
->scale_factors
[j
++] = get_bits(&s
->gb
, slen1
);
2076 g
->scale_factors
[j
++] = 0;
2080 g
->scale_factors
[j
++] = get_bits(&s
->gb
, slen2
);
2082 g
->scale_factors
[j
++] = 0;
2085 g
->scale_factors
[j
++] = 0;
2088 sc
= granules
[ch
][0].scale_factors
;
2091 n
= (k
== 0 ? 6 : 5);
2092 if ((g
->scfsi
& (0x8 >> k
)) == 0) {
2093 slen
= (k
< 2) ? slen1
: slen2
;
2096 g
->scale_factors
[j
++] = get_bits(&s
->gb
, slen
);
2099 g
->scale_factors
[j
++] = 0;
2102 /* simply copy from last granule */
2104 g
->scale_factors
[j
] = sc
[j
];
2109 g
->scale_factors
[j
++] = 0;
2112 int tindex
, tindex2
, slen
[4], sl
, sf
;
2114 /* LSF scale factors */
2115 if (g
->block_type
== 2) {
2116 tindex
= g
->switch_point
? 2 : 1;
2120 sf
= g
->scalefac_compress
;
2121 if ((s
->mode_ext
& MODE_EXT_I_STEREO
) && ch
== 1) {
2122 /* intensity stereo case */
2125 lsf_sf_expand(slen
, sf
, 6, 6, 0);
2127 } else if (sf
< 244) {
2128 lsf_sf_expand(slen
, sf
- 180, 4, 4, 0);
2131 lsf_sf_expand(slen
, sf
- 244, 3, 0, 0);
2137 lsf_sf_expand(slen
, sf
, 5, 4, 4);
2139 } else if (sf
< 500) {
2140 lsf_sf_expand(slen
, sf
- 400, 5, 4, 0);
2143 lsf_sf_expand(slen
, sf
- 500, 3, 0, 0);
2151 n
= lsf_nsf_table
[tindex2
][tindex
][k
];
2155 g
->scale_factors
[j
++] = get_bits(&s
->gb
, sl
);
2158 g
->scale_factors
[j
++] = 0;
2161 /* XXX: should compute exact size */
2163 g
->scale_factors
[j
] = 0;
2166 exponents_from_scale_factors(s
, g
, exponents
);
2168 /* read Huffman coded residue */
2169 huffman_decode(s
, g
, exponents
, bits_pos
+ g
->part2_3_length
);
2172 if (s
->nb_channels
== 2)
2173 compute_stereo(s
, &granules
[0][gr
], &granules
[1][gr
]);
2175 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
2176 g
= &granules
[ch
][gr
];
2178 reorder_block(s
, g
);
2179 s
->compute_antialias(s
, g
);
2180 compute_imdct(s
, g
, &s
->sb_samples
[ch
][18 * gr
][0], s
->mdct_buf
[ch
]);
2183 if(get_bits_count(&s
->gb
)<0)
2184 skip_bits_long(&s
->gb
, -get_bits_count(&s
->gb
));
2185 return nb_granules
* 18;
2188 static int mp_decode_frame(MPADecodeContext
*s
,
2189 OUT_INT
*samples
, const uint8_t *buf
, int buf_size
)
2191 int i
, nb_frames
, ch
;
2192 OUT_INT
*samples_ptr
;
2194 init_get_bits(&s
->gb
, buf
+ HEADER_SIZE
, (buf_size
- HEADER_SIZE
)*8);
2196 /* skip error protection field */
2197 if (s
->error_protection
)
2198 skip_bits(&s
->gb
, 16);
2200 dprintf(s
->avctx
, "frame %d:\n", s
->frame_count
);
2203 s
->avctx
->frame_size
= 384;
2204 nb_frames
= mp_decode_layer1(s
);
2207 s
->avctx
->frame_size
= 1152;
2208 nb_frames
= mp_decode_layer2(s
);
2211 s
->avctx
->frame_size
= s
->lsf
? 576 : 1152;
2213 nb_frames
= mp_decode_layer3(s
);
2216 if(s
->in_gb
.buffer
){
2217 align_get_bits(&s
->gb
);
2218 i
= (s
->gb
.size_in_bits
- get_bits_count(&s
->gb
))>>3;
2219 if(i
>= 0 && i
<= BACKSTEP_SIZE
){
2220 memmove(s
->last_buf
, s
->gb
.buffer
+ (get_bits_count(&s
->gb
)>>3), i
);
2223 av_log(s
->avctx
, AV_LOG_ERROR
, "invalid old backstep %d\n", i
);
2225 s
->in_gb
.buffer
= NULL
;
2228 align_get_bits(&s
->gb
);
2229 assert((get_bits_count(&s
->gb
) & 7) == 0);
2230 i
= (s
->gb
.size_in_bits
- get_bits_count(&s
->gb
))>>3;
2232 if(i
<0 || i
> BACKSTEP_SIZE
|| nb_frames
<0){
2234 av_log(s
->avctx
, AV_LOG_ERROR
, "invalid new backstep %d\n", i
);
2235 i
= FFMIN(BACKSTEP_SIZE
, buf_size
- HEADER_SIZE
);
2237 assert(i
<= buf_size
- HEADER_SIZE
&& i
>= 0);
2238 memcpy(s
->last_buf
+ s
->last_buf_size
, s
->gb
.buffer
+ buf_size
- HEADER_SIZE
- i
, i
);
2239 s
->last_buf_size
+= i
;
2244 /* apply the synthesis filter */
2245 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
2246 samples_ptr
= samples
+ ch
;
2247 for(i
=0;i
<nb_frames
;i
++) {
2248 ff_mpa_synth_filter(s
->synth_buf
[ch
], &(s
->synth_buf_offset
[ch
]),
2249 window
, &s
->dither_state
,
2250 samples_ptr
, s
->nb_channels
,
2251 s
->sb_samples
[ch
][i
]);
2252 samples_ptr
+= 32 * s
->nb_channels
;
2256 return nb_frames
* 32 * sizeof(OUT_INT
) * s
->nb_channels
;
2259 static int decode_frame(AVCodecContext
* avctx
,
2260 void *data
, int *data_size
,
2261 const uint8_t * buf
, int buf_size
)
2263 MPADecodeContext
*s
= avctx
->priv_data
;
2266 OUT_INT
*out_samples
= data
;
2269 if(buf_size
< HEADER_SIZE
)
2272 header
= AV_RB32(buf
);
2273 if(ff_mpa_check_header(header
) < 0){
2276 av_log(avctx
, AV_LOG_ERROR
, "Header missing skipping one byte.\n");
2280 if (ff_mpegaudio_decode_header((MPADecodeHeader
*)s
, header
) == 1) {
2281 /* free format: prepare to compute frame size */
2285 /* update codec info */
2286 avctx
->channels
= s
->nb_channels
;
2287 avctx
->bit_rate
= s
->bit_rate
;
2288 avctx
->sub_id
= s
->layer
;
2290 if(s
->frame_size
<=0 || s
->frame_size
> buf_size
){
2291 av_log(avctx
, AV_LOG_ERROR
, "incomplete frame\n");
2293 }else if(s
->frame_size
< buf_size
){
2294 av_log(avctx
, AV_LOG_ERROR
, "incorrect frame size\n");
2295 buf_size
= s
->frame_size
;
2298 out_size
= mp_decode_frame(s
, out_samples
, buf
, buf_size
);
2300 *data_size
= out_size
;
2301 avctx
->sample_rate
= s
->sample_rate
;
2302 //FIXME maybe move the other codec info stuff from above here too
2304 av_log(avctx
, AV_LOG_DEBUG
, "Error while decoding MPEG audio frame.\n"); //FIXME return -1 / but also return the number of bytes consumed
2309 static void flush(AVCodecContext
*avctx
){
2310 MPADecodeContext
*s
= avctx
->priv_data
;
2311 memset(s
->synth_buf
, 0, sizeof(s
->synth_buf
));
2312 s
->last_buf_size
= 0;
2315 #if CONFIG_MP3ADU_DECODER
2316 static int decode_frame_adu(AVCodecContext
* avctx
,
2317 void *data
, int *data_size
,
2318 const uint8_t * buf
, int buf_size
)
2320 MPADecodeContext
*s
= avctx
->priv_data
;
2323 OUT_INT
*out_samples
= data
;
2327 // Discard too short frames
2328 if (buf_size
< HEADER_SIZE
) {
2334 if (len
> MPA_MAX_CODED_FRAME_SIZE
)
2335 len
= MPA_MAX_CODED_FRAME_SIZE
;
2337 // Get header and restore sync word
2338 header
= AV_RB32(buf
) | 0xffe00000;
2340 if (ff_mpa_check_header(header
) < 0) { // Bad header, discard frame
2345 ff_mpegaudio_decode_header((MPADecodeHeader
*)s
, header
);
2346 /* update codec info */
2347 avctx
->sample_rate
= s
->sample_rate
;
2348 avctx
->channels
= s
->nb_channels
;
2349 avctx
->bit_rate
= s
->bit_rate
;
2350 avctx
->sub_id
= s
->layer
;
2352 s
->frame_size
= len
;
2354 if (avctx
->parse_only
) {
2355 out_size
= buf_size
;
2357 out_size
= mp_decode_frame(s
, out_samples
, buf
, buf_size
);
2360 *data_size
= out_size
;
2363 #endif /* CONFIG_MP3ADU_DECODER */
2365 #if CONFIG_MP3ON4_DECODER
2368 * Context for MP3On4 decoder
2370 typedef struct MP3On4DecodeContext
{
2371 int frames
; ///< number of mp3 frames per block (number of mp3 decoder instances)
2372 int syncword
; ///< syncword patch
2373 const uint8_t *coff
; ///< channels offsets in output buffer
2374 MPADecodeContext
*mp3decctx
[5]; ///< MPADecodeContext for every decoder instance
2375 } MP3On4DecodeContext
;
2377 #include "mpeg4audio.h"
2379 /* Next 3 arrays are indexed by channel config number (passed via codecdata) */
2380 static const uint8_t mp3Frames
[8] = {0,1,1,2,3,3,4,5}; /* number of mp3 decoder instances */
2381 /* offsets into output buffer, assume output order is FL FR BL BR C LFE */
2382 static const uint8_t chan_offset
[8][5] = {
2387 {2,0,3}, // C FLR BS
2388 {4,0,2}, // C FLR BLRS
2389 {4,0,2,5}, // C FLR BLRS LFE
2390 {4,0,2,6,5}, // C FLR BLRS BLR LFE
2394 static int decode_init_mp3on4(AVCodecContext
* avctx
)
2396 MP3On4DecodeContext
*s
= avctx
->priv_data
;
2397 MPEG4AudioConfig cfg
;
2400 if ((avctx
->extradata_size
< 2) || (avctx
->extradata
== NULL
)) {
2401 av_log(avctx
, AV_LOG_ERROR
, "Codec extradata missing or too short.\n");
2405 ff_mpeg4audio_get_config(&cfg
, avctx
->extradata
, avctx
->extradata_size
);
2406 if (!cfg
.chan_config
|| cfg
.chan_config
> 7) {
2407 av_log(avctx
, AV_LOG_ERROR
, "Invalid channel config number.\n");
2410 s
->frames
= mp3Frames
[cfg
.chan_config
];
2411 s
->coff
= chan_offset
[cfg
.chan_config
];
2412 avctx
->channels
= ff_mpeg4audio_channels
[cfg
.chan_config
];
2414 if (cfg
.sample_rate
< 16000)
2415 s
->syncword
= 0xffe00000;
2417 s
->syncword
= 0xfff00000;
2419 /* Init the first mp3 decoder in standard way, so that all tables get builded
2420 * We replace avctx->priv_data with the context of the first decoder so that
2421 * decode_init() does not have to be changed.
2422 * Other decoders will be initialized here copying data from the first context
2424 // Allocate zeroed memory for the first decoder context
2425 s
->mp3decctx
[0] = av_mallocz(sizeof(MPADecodeContext
));
2426 // Put decoder context in place to make init_decode() happy
2427 avctx
->priv_data
= s
->mp3decctx
[0];
2429 // Restore mp3on4 context pointer
2430 avctx
->priv_data
= s
;
2431 s
->mp3decctx
[0]->adu_mode
= 1; // Set adu mode
2433 /* Create a separate codec/context for each frame (first is already ok).
2434 * Each frame is 1 or 2 channels - up to 5 frames allowed
2436 for (i
= 1; i
< s
->frames
; i
++) {
2437 s
->mp3decctx
[i
] = av_mallocz(sizeof(MPADecodeContext
));
2438 s
->mp3decctx
[i
]->compute_antialias
= s
->mp3decctx
[0]->compute_antialias
;
2439 s
->mp3decctx
[i
]->adu_mode
= 1;
2440 s
->mp3decctx
[i
]->avctx
= avctx
;
2447 static int decode_close_mp3on4(AVCodecContext
* avctx
)
2449 MP3On4DecodeContext
*s
= avctx
->priv_data
;
2452 for (i
= 0; i
< s
->frames
; i
++)
2453 if (s
->mp3decctx
[i
])
2454 av_free(s
->mp3decctx
[i
]);
2460 static int decode_frame_mp3on4(AVCodecContext
* avctx
,
2461 void *data
, int *data_size
,
2462 const uint8_t * buf
, int buf_size
)
2464 MP3On4DecodeContext
*s
= avctx
->priv_data
;
2465 MPADecodeContext
*m
;
2466 int fsize
, len
= buf_size
, out_size
= 0;
2468 OUT_INT
*out_samples
= data
;
2469 OUT_INT decoded_buf
[MPA_FRAME_SIZE
* MPA_MAX_CHANNELS
];
2470 OUT_INT
*outptr
, *bp
;
2474 // Discard too short frames
2475 if (buf_size
< HEADER_SIZE
)
2478 // If only one decoder interleave is not needed
2479 outptr
= s
->frames
== 1 ? out_samples
: decoded_buf
;
2481 avctx
->bit_rate
= 0;
2483 for (fr
= 0; fr
< s
->frames
; fr
++) {
2484 fsize
= AV_RB16(buf
) >> 4;
2485 fsize
= FFMIN3(fsize
, len
, MPA_MAX_CODED_FRAME_SIZE
);
2486 m
= s
->mp3decctx
[fr
];
2489 header
= (AV_RB32(buf
) & 0x000fffff) | s
->syncword
; // patch header
2491 if (ff_mpa_check_header(header
) < 0) // Bad header, discard block
2494 ff_mpegaudio_decode_header((MPADecodeHeader
*)m
, header
);
2495 out_size
+= mp_decode_frame(m
, outptr
, buf
, fsize
);
2500 n
= m
->avctx
->frame_size
*m
->nb_channels
;
2501 /* interleave output data */
2502 bp
= out_samples
+ s
->coff
[fr
];
2503 if(m
->nb_channels
== 1) {
2504 for(j
= 0; j
< n
; j
++) {
2505 *bp
= decoded_buf
[j
];
2506 bp
+= avctx
->channels
;
2509 for(j
= 0; j
< n
; j
++) {
2510 bp
[0] = decoded_buf
[j
++];
2511 bp
[1] = decoded_buf
[j
];
2512 bp
+= avctx
->channels
;
2516 avctx
->bit_rate
+= m
->bit_rate
;
2519 /* update codec info */
2520 avctx
->sample_rate
= s
->mp3decctx
[0]->sample_rate
;
2522 *data_size
= out_size
;
2525 #endif /* CONFIG_MP3ON4_DECODER */
2527 #if CONFIG_MP1_DECODER
2528 AVCodec mp1_decoder
=
2533 sizeof(MPADecodeContext
),
2538 CODEC_CAP_PARSE_ONLY
,
2540 .long_name
= NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"),
2543 #if CONFIG_MP2_DECODER
2544 AVCodec mp2_decoder
=
2549 sizeof(MPADecodeContext
),
2554 CODEC_CAP_PARSE_ONLY
,
2556 .long_name
= NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
2559 #if CONFIG_MP3_DECODER
2560 AVCodec mp3_decoder
=
2565 sizeof(MPADecodeContext
),
2570 CODEC_CAP_PARSE_ONLY
,
2572 .long_name
= NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
2575 #if CONFIG_MP3ADU_DECODER
2576 AVCodec mp3adu_decoder
=
2581 sizeof(MPADecodeContext
),
2586 CODEC_CAP_PARSE_ONLY
,
2588 .long_name
= NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
2591 #if CONFIG_MP3ON4_DECODER
2592 AVCodec mp3on4_decoder
=
2597 sizeof(MP3On4DecodeContext
),
2600 decode_close_mp3on4
,
2601 decode_frame_mp3on4
,
2603 .long_name
= NULL_IF_CONFIG_SMALL("MP3onMP4"),