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 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 /* define USE_HIGHPRECISION to have a bit exact (but slower) mpeg
39 #ifdef CONFIG_MPEGAUDIO_HP
40 # define USE_HIGHPRECISION
43 #include "mpegaudio.h"
44 #include "mpegaudiodecheader.h"
48 /* WARNING: only correct for posititive numbers */
49 #define FIXR(a) ((int)((a) * FRAC_ONE + 0.5))
50 #define FRAC_RND(a) (((a) + (FRAC_ONE/2)) >> FRAC_BITS)
52 #define FIXHR(a) ((int)((a) * (1LL<<32) + 0.5))
58 /* layer 3 "granule" */
59 typedef struct GranuleDef
{
64 int scalefac_compress
;
69 uint8_t scalefac_scale
;
70 uint8_t count1table_select
;
71 int region_size
[3]; /* number of huffman codes in each region */
73 int short_start
, long_end
; /* long/short band indexes */
74 uint8_t scale_factors
[40];
75 int32_t sb_hybrid
[SBLIMIT
* 18]; /* 576 samples */
78 #include "mpegaudiodata.h"
79 #include "mpegaudiodectab.h"
81 static void compute_antialias_integer(MPADecodeContext
*s
, GranuleDef
*g
);
82 static void compute_antialias_float(MPADecodeContext
*s
, GranuleDef
*g
);
84 /* vlc structure for decoding layer 3 huffman tables */
85 static VLC huff_vlc
[16];
86 static VLC_TYPE huff_vlc_tables
[
87 0+128+128+128+130+128+154+166+
88 142+204+190+170+542+460+662+414
90 static const int huff_vlc_tables_sizes
[16] = {
91 0, 128, 128, 128, 130, 128, 154, 166,
92 142, 204, 190, 170, 542, 460, 662, 414
94 static VLC huff_quad_vlc
[2];
95 static VLC_TYPE huff_quad_vlc_tables
[128+16][2];
96 static const int huff_quad_vlc_tables_sizes
[2] = {
99 /* computed from band_size_long */
100 static uint16_t band_index_long
[9][23];
101 /* XXX: free when all decoders are closed */
102 #define TABLE_4_3_SIZE (8191 + 16)*4
103 static int8_t table_4_3_exp
[TABLE_4_3_SIZE
];
104 static uint32_t table_4_3_value
[TABLE_4_3_SIZE
];
105 static uint32_t exp_table
[512];
106 static uint32_t expval_table
[512][16];
107 /* intensity stereo coef table */
108 static int32_t is_table
[2][16];
109 static int32_t is_table_lsf
[2][2][16];
110 static int32_t csa_table
[8][4];
111 static float csa_table_float
[8][4];
112 static int32_t mdct_win
[8][36];
114 /* lower 2 bits: modulo 3, higher bits: shift */
115 static uint16_t scale_factor_modshift
[64];
116 /* [i][j]: 2^(-j/3) * FRAC_ONE * 2^(i+2) / (2^(i+2) - 1) */
117 static int32_t scale_factor_mult
[15][3];
118 /* mult table for layer 2 group quantization */
120 #define SCALE_GEN(v) \
121 { FIXR(1.0 * (v)), FIXR(0.7937005259 * (v)), FIXR(0.6299605249 * (v)) }
123 static const int32_t scale_factor_mult2
[3][3] = {
124 SCALE_GEN(4.0 / 3.0), /* 3 steps */
125 SCALE_GEN(4.0 / 5.0), /* 5 steps */
126 SCALE_GEN(4.0 / 9.0), /* 9 steps */
129 static DECLARE_ALIGNED_16(MPA_INT
, window
[512]);
132 * Convert region offsets to region sizes and truncate
133 * size to big_values.
135 void ff_region_offset2size(GranuleDef
*g
){
137 g
->region_size
[2] = (576 / 2);
139 k
= FFMIN(g
->region_size
[i
], g
->big_values
);
140 g
->region_size
[i
] = k
- j
;
145 void ff_init_short_region(MPADecodeContext
*s
, GranuleDef
*g
){
146 if (g
->block_type
== 2)
147 g
->region_size
[0] = (36 / 2);
149 if (s
->sample_rate_index
<= 2)
150 g
->region_size
[0] = (36 / 2);
151 else if (s
->sample_rate_index
!= 8)
152 g
->region_size
[0] = (54 / 2);
154 g
->region_size
[0] = (108 / 2);
156 g
->region_size
[1] = (576 / 2);
159 void ff_init_long_region(MPADecodeContext
*s
, GranuleDef
*g
, int ra1
, int ra2
){
162 band_index_long
[s
->sample_rate_index
][ra1
+ 1] >> 1;
163 /* should not overflow */
164 l
= FFMIN(ra1
+ ra2
+ 2, 22);
166 band_index_long
[s
->sample_rate_index
][l
] >> 1;
169 void ff_compute_band_indexes(MPADecodeContext
*s
, GranuleDef
*g
){
170 if (g
->block_type
== 2) {
171 if (g
->switch_point
) {
172 /* if switched mode, we handle the 36 first samples as
173 long blocks. For 8000Hz, we handle the 48 first
174 exponents as long blocks (XXX: check this!) */
175 if (s
->sample_rate_index
<= 2)
177 else if (s
->sample_rate_index
!= 8)
180 g
->long_end
= 4; /* 8000 Hz */
182 g
->short_start
= 2 + (s
->sample_rate_index
!= 8);
193 /* layer 1 unscaling */
194 /* n = number of bits of the mantissa minus 1 */
195 static inline int l1_unscale(int n
, int mant
, int scale_factor
)
200 shift
= scale_factor_modshift
[scale_factor
];
203 val
= MUL64(mant
+ (-1 << n
) + 1, scale_factor_mult
[n
-1][mod
]);
205 /* NOTE: at this point, 1 <= shift >= 21 + 15 */
206 return (int)((val
+ (1LL << (shift
- 1))) >> shift
);
209 static inline int l2_unscale_group(int steps
, int mant
, int scale_factor
)
213 shift
= scale_factor_modshift
[scale_factor
];
217 val
= (mant
- (steps
>> 1)) * scale_factor_mult2
[steps
>> 2][mod
];
218 /* NOTE: at this point, 0 <= shift <= 21 */
220 val
= (val
+ (1 << (shift
- 1))) >> shift
;
224 /* compute value^(4/3) * 2^(exponent/4). It normalized to FRAC_BITS */
225 static inline int l3_unscale(int value
, int exponent
)
230 e
= table_4_3_exp
[4*value
+ (exponent
&3)];
231 m
= table_4_3_value
[4*value
+ (exponent
&3)];
232 e
-= (exponent
>> 2);
236 m
= (m
+ (1 << (e
-1))) >> e
;
241 /* all integer n^(4/3) computation code */
244 #define POW_FRAC_BITS 24
245 #define POW_FRAC_ONE (1 << POW_FRAC_BITS)
246 #define POW_FIX(a) ((int)((a) * POW_FRAC_ONE))
247 #define POW_MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> POW_FRAC_BITS)
249 static int dev_4_3_coefs
[DEV_ORDER
];
252 static int pow_mult3
[3] = {
254 POW_FIX(1.25992104989487316476),
255 POW_FIX(1.58740105196819947474),
259 static void int_pow_init(void)
264 for(i
=0;i
<DEV_ORDER
;i
++) {
265 a
= POW_MULL(a
, POW_FIX(4.0 / 3.0) - i
* POW_FIX(1.0)) / (i
+ 1);
266 dev_4_3_coefs
[i
] = a
;
270 #if 0 /* unused, remove? */
271 /* return the mantissa and the binary exponent */
272 static int int_pow(int i
, int *exp_ptr
)
280 while (a
< (1 << (POW_FRAC_BITS
- 1))) {
284 a
-= (1 << POW_FRAC_BITS
);
286 for(j
= DEV_ORDER
- 1; j
>= 0; j
--)
287 a1
= POW_MULL(a
, dev_4_3_coefs
[j
] + a1
);
288 a
= (1 << POW_FRAC_BITS
) + a1
;
289 /* exponent compute (exact) */
293 a
= POW_MULL(a
, pow_mult3
[er
]);
294 while (a
>= 2 * POW_FRAC_ONE
) {
298 /* convert to float */
299 while (a
< POW_FRAC_ONE
) {
303 /* now POW_FRAC_ONE <= a < 2 * POW_FRAC_ONE */
304 #if POW_FRAC_BITS > FRAC_BITS
305 a
= (a
+ (1 << (POW_FRAC_BITS
- FRAC_BITS
- 1))) >> (POW_FRAC_BITS
- FRAC_BITS
);
306 /* correct overflow */
307 if (a
>= 2 * (1 << FRAC_BITS
)) {
317 static int decode_init(AVCodecContext
* avctx
)
319 MPADecodeContext
*s
= avctx
->priv_data
;
325 #if defined(USE_HIGHPRECISION) && defined(CONFIG_AUDIO_NONSHORT)
326 avctx
->sample_fmt
= SAMPLE_FMT_S32
;
328 avctx
->sample_fmt
= SAMPLE_FMT_S16
;
330 s
->error_recognition
= avctx
->error_recognition
;
332 if(avctx
->antialias_algo
!= FF_AA_FLOAT
)
333 s
->compute_antialias
= compute_antialias_integer
;
335 s
->compute_antialias
= compute_antialias_float
;
337 if (!init
&& !avctx
->parse_only
) {
340 /* scale factors table for layer 1/2 */
343 /* 1.0 (i = 3) is normalized to 2 ^ FRAC_BITS */
346 scale_factor_modshift
[i
] = mod
| (shift
<< 2);
349 /* scale factor multiply for layer 1 */
353 norm
= ((INT64_C(1) << n
) * FRAC_ONE
) / ((1 << n
) - 1);
354 scale_factor_mult
[i
][0] = MULL(FIXR(1.0 * 2.0), norm
, FRAC_BITS
);
355 scale_factor_mult
[i
][1] = MULL(FIXR(0.7937005259 * 2.0), norm
, FRAC_BITS
);
356 scale_factor_mult
[i
][2] = MULL(FIXR(0.6299605249 * 2.0), norm
, FRAC_BITS
);
357 dprintf(avctx
, "%d: norm=%x s=%x %x %x\n",
359 scale_factor_mult
[i
][0],
360 scale_factor_mult
[i
][1],
361 scale_factor_mult
[i
][2]);
364 ff_mpa_synth_init(window
);
366 /* huffman decode tables */
369 const HuffTable
*h
= &mpa_huff_tables
[i
];
372 uint8_t tmp_bits
[512];
373 uint16_t tmp_codes
[512];
375 memset(tmp_bits
, 0, sizeof(tmp_bits
));
376 memset(tmp_codes
, 0, sizeof(tmp_codes
));
382 for(x
=0;x
<xsize
;x
++) {
383 for(y
=0;y
<xsize
;y
++){
384 tmp_bits
[(x
<< 5) | y
| ((x
&&y
)<<4)]= h
->bits
[j
];
385 tmp_codes
[(x
<< 5) | y
| ((x
&&y
)<<4)]= h
->codes
[j
++];
390 huff_vlc
[i
].table
= huff_vlc_tables
+offset
;
391 huff_vlc
[i
].table_allocated
= huff_vlc_tables_sizes
[i
];
392 init_vlc(&huff_vlc
[i
], 7, 512,
393 tmp_bits
, 1, 1, tmp_codes
, 2, 2,
394 INIT_VLC_USE_NEW_STATIC
);
395 offset
+= huff_vlc_tables_sizes
[i
];
397 assert(offset
== FF_ARRAY_ELEMS(huff_vlc_tables
));
401 huff_quad_vlc
[i
].table
= huff_quad_vlc_tables
+offset
;
402 huff_quad_vlc
[i
].table_allocated
= huff_quad_vlc_tables_sizes
[i
];
403 init_vlc(&huff_quad_vlc
[i
], i
== 0 ? 7 : 4, 16,
404 mpa_quad_bits
[i
], 1, 1, mpa_quad_codes
[i
], 1, 1,
405 INIT_VLC_USE_NEW_STATIC
);
406 offset
+= huff_quad_vlc_tables_sizes
[i
];
408 assert(offset
== FF_ARRAY_ELEMS(huff_quad_vlc_tables
));
413 band_index_long
[i
][j
] = k
;
414 k
+= band_size_long
[i
][j
];
416 band_index_long
[i
][22] = k
;
419 /* compute n ^ (4/3) and store it in mantissa/exp format */
422 for(i
=1;i
<TABLE_4_3_SIZE
;i
++) {
425 f
= pow((double)(i
/4), 4.0 / 3.0) * pow(2, (i
&3)*0.25);
427 m
= (uint32_t)(fm
*(1LL<<31) + 0.5);
428 e
+= FRAC_BITS
- 31 + 5 - 100;
430 /* normalized to FRAC_BITS */
431 table_4_3_value
[i
] = m
;
432 table_4_3_exp
[i
] = -e
;
434 for(i
=0; i
<512*16; i
++){
435 int exponent
= (i
>>4);
436 double f
= pow(i
&15, 4.0 / 3.0) * pow(2, (exponent
-400)*0.25 + FRAC_BITS
+ 5);
437 expval_table
[exponent
][i
&15]= llrint(f
);
439 exp_table
[exponent
]= llrint(f
);
446 f
= tan((double)i
* M_PI
/ 12.0);
447 v
= FIXR(f
/ (1.0 + f
));
452 is_table
[1][6 - i
] = v
;
456 is_table
[0][i
] = is_table
[1][i
] = 0.0;
463 e
= -(j
+ 1) * ((i
+ 1) >> 1);
464 f
= pow(2.0, e
/ 4.0);
466 is_table_lsf
[j
][k
^ 1][i
] = FIXR(f
);
467 is_table_lsf
[j
][k
][i
] = FIXR(1.0);
468 dprintf(avctx
, "is_table_lsf %d %d: %x %x\n",
469 i
, j
, is_table_lsf
[j
][0][i
], is_table_lsf
[j
][1][i
]);
476 cs
= 1.0 / sqrt(1.0 + ci
* ci
);
478 csa_table
[i
][0] = FIXHR(cs
/4);
479 csa_table
[i
][1] = FIXHR(ca
/4);
480 csa_table
[i
][2] = FIXHR(ca
/4) + FIXHR(cs
/4);
481 csa_table
[i
][3] = FIXHR(ca
/4) - FIXHR(cs
/4);
482 csa_table_float
[i
][0] = cs
;
483 csa_table_float
[i
][1] = ca
;
484 csa_table_float
[i
][2] = ca
+ cs
;
485 csa_table_float
[i
][3] = ca
- cs
;
488 /* compute mdct windows */
496 d
= sin(M_PI
* (i
+ 0.5) / 36.0);
499 else if(i
>=24) d
= sin(M_PI
* (i
- 18 + 0.5) / 12.0);
503 else if(i
< 12) d
= sin(M_PI
* (i
- 6 + 0.5) / 12.0);
506 //merge last stage of imdct into the window coefficients
507 d
*= 0.5 / cos(M_PI
*(2*i
+ 19)/72);
510 mdct_win
[j
][i
/3] = FIXHR((d
/ (1<<5)));
512 mdct_win
[j
][i
] = FIXHR((d
/ (1<<5)));
516 /* NOTE: we do frequency inversion adter the MDCT by changing
517 the sign of the right window coefs */
520 mdct_win
[j
+ 4][i
] = mdct_win
[j
][i
];
521 mdct_win
[j
+ 4][i
+ 1] = -mdct_win
[j
][i
+ 1];
528 if (avctx
->codec_id
== CODEC_ID_MP3ADU
)
533 /* tab[i][j] = 1.0 / (2.0 * cos(pi*(2*k+1) / 2^(6 - j))) */
537 #define COS0_0 FIXHR(0.50060299823519630134/2)
538 #define COS0_1 FIXHR(0.50547095989754365998/2)
539 #define COS0_2 FIXHR(0.51544730992262454697/2)
540 #define COS0_3 FIXHR(0.53104259108978417447/2)
541 #define COS0_4 FIXHR(0.55310389603444452782/2)
542 #define COS0_5 FIXHR(0.58293496820613387367/2)
543 #define COS0_6 FIXHR(0.62250412303566481615/2)
544 #define COS0_7 FIXHR(0.67480834145500574602/2)
545 #define COS0_8 FIXHR(0.74453627100229844977/2)
546 #define COS0_9 FIXHR(0.83934964541552703873/2)
547 #define COS0_10 FIXHR(0.97256823786196069369/2)
548 #define COS0_11 FIXHR(1.16943993343288495515/4)
549 #define COS0_12 FIXHR(1.48416461631416627724/4)
550 #define COS0_13 FIXHR(2.05778100995341155085/8)
551 #define COS0_14 FIXHR(3.40760841846871878570/8)
552 #define COS0_15 FIXHR(10.19000812354805681150/32)
554 #define COS1_0 FIXHR(0.50241928618815570551/2)
555 #define COS1_1 FIXHR(0.52249861493968888062/2)
556 #define COS1_2 FIXHR(0.56694403481635770368/2)
557 #define COS1_3 FIXHR(0.64682178335999012954/2)
558 #define COS1_4 FIXHR(0.78815462345125022473/2)
559 #define COS1_5 FIXHR(1.06067768599034747134/4)
560 #define COS1_6 FIXHR(1.72244709823833392782/4)
561 #define COS1_7 FIXHR(5.10114861868916385802/16)
563 #define COS2_0 FIXHR(0.50979557910415916894/2)
564 #define COS2_1 FIXHR(0.60134488693504528054/2)
565 #define COS2_2 FIXHR(0.89997622313641570463/2)
566 #define COS2_3 FIXHR(2.56291544774150617881/8)
568 #define COS3_0 FIXHR(0.54119610014619698439/2)
569 #define COS3_1 FIXHR(1.30656296487637652785/4)
571 #define COS4_0 FIXHR(0.70710678118654752439/2)
573 /* butterfly operator */
574 #define BF(a, b, c, s)\
576 tmp0 = tab[a] + tab[b];\
577 tmp1 = tab[a] - tab[b];\
579 tab[b] = MULH(tmp1<<(s), c);\
582 #define BF1(a, b, c, d)\
584 BF(a, b, COS4_0, 1);\
585 BF(c, d,-COS4_0, 1);\
589 #define BF2(a, b, c, d)\
591 BF(a, b, COS4_0, 1);\
592 BF(c, d,-COS4_0, 1);\
599 #define ADD(a, b) tab[a] += tab[b]
601 /* DCT32 without 1/sqrt(2) coef zero scaling. */
602 static void dct32(int32_t *out
, int32_t *tab
)
607 BF( 0, 31, COS0_0
, 1);
608 BF(15, 16, COS0_15
, 5);
610 BF( 0, 15, COS1_0
, 1);
611 BF(16, 31,-COS1_0
, 1);
613 BF( 7, 24, COS0_7
, 1);
614 BF( 8, 23, COS0_8
, 1);
616 BF( 7, 8, COS1_7
, 4);
617 BF(23, 24,-COS1_7
, 4);
619 BF( 0, 7, COS2_0
, 1);
620 BF( 8, 15,-COS2_0
, 1);
621 BF(16, 23, COS2_0
, 1);
622 BF(24, 31,-COS2_0
, 1);
624 BF( 3, 28, COS0_3
, 1);
625 BF(12, 19, COS0_12
, 2);
627 BF( 3, 12, COS1_3
, 1);
628 BF(19, 28,-COS1_3
, 1);
630 BF( 4, 27, COS0_4
, 1);
631 BF(11, 20, COS0_11
, 2);
633 BF( 4, 11, COS1_4
, 1);
634 BF(20, 27,-COS1_4
, 1);
636 BF( 3, 4, COS2_3
, 3);
637 BF(11, 12,-COS2_3
, 3);
638 BF(19, 20, COS2_3
, 3);
639 BF(27, 28,-COS2_3
, 3);
641 BF( 0, 3, COS3_0
, 1);
642 BF( 4, 7,-COS3_0
, 1);
643 BF( 8, 11, COS3_0
, 1);
644 BF(12, 15,-COS3_0
, 1);
645 BF(16, 19, COS3_0
, 1);
646 BF(20, 23,-COS3_0
, 1);
647 BF(24, 27, COS3_0
, 1);
648 BF(28, 31,-COS3_0
, 1);
653 BF( 1, 30, COS0_1
, 1);
654 BF(14, 17, COS0_14
, 3);
656 BF( 1, 14, COS1_1
, 1);
657 BF(17, 30,-COS1_1
, 1);
659 BF( 6, 25, COS0_6
, 1);
660 BF( 9, 22, COS0_9
, 1);
662 BF( 6, 9, COS1_6
, 2);
663 BF(22, 25,-COS1_6
, 2);
665 BF( 1, 6, COS2_1
, 1);
666 BF( 9, 14,-COS2_1
, 1);
667 BF(17, 22, COS2_1
, 1);
668 BF(25, 30,-COS2_1
, 1);
671 BF( 2, 29, COS0_2
, 1);
672 BF(13, 18, COS0_13
, 3);
674 BF( 2, 13, COS1_2
, 1);
675 BF(18, 29,-COS1_2
, 1);
677 BF( 5, 26, COS0_5
, 1);
678 BF(10, 21, COS0_10
, 1);
680 BF( 5, 10, COS1_5
, 2);
681 BF(21, 26,-COS1_5
, 2);
683 BF( 2, 5, COS2_2
, 1);
684 BF(10, 13,-COS2_2
, 1);
685 BF(18, 21, COS2_2
, 1);
686 BF(26, 29,-COS2_2
, 1);
688 BF( 1, 2, COS3_1
, 2);
689 BF( 5, 6,-COS3_1
, 2);
690 BF( 9, 10, COS3_1
, 2);
691 BF(13, 14,-COS3_1
, 2);
692 BF(17, 18, COS3_1
, 2);
693 BF(21, 22,-COS3_1
, 2);
694 BF(25, 26, COS3_1
, 2);
695 BF(29, 30,-COS3_1
, 2);
742 out
[ 1] = tab
[16] + tab
[24];
743 out
[17] = tab
[17] + tab
[25];
744 out
[ 9] = tab
[18] + tab
[26];
745 out
[25] = tab
[19] + tab
[27];
746 out
[ 5] = tab
[20] + tab
[28];
747 out
[21] = tab
[21] + tab
[29];
748 out
[13] = tab
[22] + tab
[30];
749 out
[29] = tab
[23] + tab
[31];
750 out
[ 3] = tab
[24] + tab
[20];
751 out
[19] = tab
[25] + tab
[21];
752 out
[11] = tab
[26] + tab
[22];
753 out
[27] = tab
[27] + tab
[23];
754 out
[ 7] = tab
[28] + tab
[18];
755 out
[23] = tab
[29] + tab
[19];
756 out
[15] = tab
[30] + tab
[17];
762 static inline int round_sample(int *sum
)
765 sum1
= (*sum
) >> OUT_SHIFT
;
766 *sum
&= (1<<OUT_SHIFT
)-1;
769 else if (sum1
> OUT_MAX
)
774 /* signed 16x16 -> 32 multiply add accumulate */
775 #define MACS(rt, ra, rb) MAC16(rt, ra, rb)
777 /* signed 16x16 -> 32 multiply */
778 #define MULS(ra, rb) MUL16(ra, rb)
780 #define MLSS(rt, ra, rb) MLS16(rt, ra, rb)
784 static inline int round_sample(int64_t *sum
)
787 sum1
= (int)((*sum
) >> OUT_SHIFT
);
788 *sum
&= (1<<OUT_SHIFT
)-1;
791 else if (sum1
> OUT_MAX
)
796 # define MULS(ra, rb) MUL64(ra, rb)
797 # define MACS(rt, ra, rb) MAC64(rt, ra, rb)
798 # define MLSS(rt, ra, rb) MLS64(rt, ra, rb)
801 #define SUM8(op, sum, w, p) \
803 op(sum, (w)[0 * 64], p[0 * 64]); \
804 op(sum, (w)[1 * 64], p[1 * 64]); \
805 op(sum, (w)[2 * 64], p[2 * 64]); \
806 op(sum, (w)[3 * 64], p[3 * 64]); \
807 op(sum, (w)[4 * 64], p[4 * 64]); \
808 op(sum, (w)[5 * 64], p[5 * 64]); \
809 op(sum, (w)[6 * 64], p[6 * 64]); \
810 op(sum, (w)[7 * 64], p[7 * 64]); \
813 #define SUM8P2(sum1, op1, sum2, op2, w1, w2, p) \
817 op1(sum1, (w1)[0 * 64], tmp);\
818 op2(sum2, (w2)[0 * 64], tmp);\
820 op1(sum1, (w1)[1 * 64], tmp);\
821 op2(sum2, (w2)[1 * 64], tmp);\
823 op1(sum1, (w1)[2 * 64], tmp);\
824 op2(sum2, (w2)[2 * 64], tmp);\
826 op1(sum1, (w1)[3 * 64], tmp);\
827 op2(sum2, (w2)[3 * 64], tmp);\
829 op1(sum1, (w1)[4 * 64], tmp);\
830 op2(sum2, (w2)[4 * 64], tmp);\
832 op1(sum1, (w1)[5 * 64], tmp);\
833 op2(sum2, (w2)[5 * 64], tmp);\
835 op1(sum1, (w1)[6 * 64], tmp);\
836 op2(sum2, (w2)[6 * 64], tmp);\
838 op1(sum1, (w1)[7 * 64], tmp);\
839 op2(sum2, (w2)[7 * 64], tmp);\
842 void ff_mpa_synth_init(MPA_INT
*window
)
846 /* max = 18760, max sum over all 16 coefs : 44736 */
849 v
= ff_mpa_enwindow
[i
];
851 v
= (v
+ (1 << (16 - WFRAC_BITS
- 1))) >> (16 - WFRAC_BITS
);
861 /* 32 sub band synthesis filter. Input: 32 sub band samples, Output:
863 /* XXX: optimize by avoiding ring buffer usage */
864 void ff_mpa_synth_filter(MPA_INT
*synth_buf_ptr
, int *synth_buf_offset
,
865 MPA_INT
*window
, int *dither_state
,
866 OUT_INT
*samples
, int incr
,
867 int32_t sb_samples
[SBLIMIT
])
870 register MPA_INT
*synth_buf
;
871 register const MPA_INT
*w
, *w2
, *p
;
880 dct32(tmp
, sb_samples
);
882 offset
= *synth_buf_offset
;
883 synth_buf
= synth_buf_ptr
+ offset
;
888 /* NOTE: can cause a loss in precision if very high amplitude
890 v
= av_clip_int16(v
);
894 /* copy to avoid wrap */
895 memcpy(synth_buf
+ 512, synth_buf
, 32 * sizeof(MPA_INT
));
897 samples2
= samples
+ 31 * incr
;
903 SUM8(MACS
, sum
, w
, p
);
905 SUM8(MLSS
, sum
, w
+ 32, p
);
906 *samples
= round_sample(&sum
);
910 /* we calculate two samples at the same time to avoid one memory
911 access per two sample */
914 p
= synth_buf
+ 16 + j
;
915 SUM8P2(sum
, MACS
, sum2
, MLSS
, w
, w2
, p
);
916 p
= synth_buf
+ 48 - j
;
917 SUM8P2(sum
, MLSS
, sum2
, MLSS
, w
+ 32, w2
+ 32, p
);
919 *samples
= round_sample(&sum
);
922 *samples2
= round_sample(&sum
);
929 SUM8(MLSS
, sum
, w
+ 32, p
);
930 *samples
= round_sample(&sum
);
933 offset
= (offset
- 32) & 511;
934 *synth_buf_offset
= offset
;
937 #define C3 FIXHR(0.86602540378443864676/2)
939 /* 0.5 / cos(pi*(2*i+1)/36) */
940 static const int icos36
[9] = {
941 FIXR(0.50190991877167369479),
942 FIXR(0.51763809020504152469), //0
943 FIXR(0.55168895948124587824),
944 FIXR(0.61038729438072803416),
945 FIXR(0.70710678118654752439), //1
946 FIXR(0.87172339781054900991),
947 FIXR(1.18310079157624925896),
948 FIXR(1.93185165257813657349), //2
949 FIXR(5.73685662283492756461),
952 /* 0.5 / cos(pi*(2*i+1)/36) */
953 static const int icos36h
[9] = {
954 FIXHR(0.50190991877167369479/2),
955 FIXHR(0.51763809020504152469/2), //0
956 FIXHR(0.55168895948124587824/2),
957 FIXHR(0.61038729438072803416/2),
958 FIXHR(0.70710678118654752439/2), //1
959 FIXHR(0.87172339781054900991/2),
960 FIXHR(1.18310079157624925896/4),
961 FIXHR(1.93185165257813657349/4), //2
962 // FIXHR(5.73685662283492756461),
965 /* 12 points IMDCT. We compute it "by hand" by factorizing obvious
967 static void imdct12(int *out
, int *in
)
969 int in0
, in1
, in2
, in3
, in4
, in5
, t1
, t2
;
972 in1
= in
[1*3] + in
[0*3];
973 in2
= in
[2*3] + in
[1*3];
974 in3
= in
[3*3] + in
[2*3];
975 in4
= in
[4*3] + in
[3*3];
976 in5
= in
[5*3] + in
[4*3];
980 in2
= MULH(2*in2
, C3
);
981 in3
= MULH(4*in3
, C3
);
984 t2
= MULH(2*(in1
- in5
), icos36h
[4]);
994 in1
= MULH(in5
+ in3
, icos36h
[1]);
1001 in5
= MULH(2*(in5
- in3
), icos36h
[7]);
1009 #define C1 FIXHR(0.98480775301220805936/2)
1010 #define C2 FIXHR(0.93969262078590838405/2)
1011 #define C3 FIXHR(0.86602540378443864676/2)
1012 #define C4 FIXHR(0.76604444311897803520/2)
1013 #define C5 FIXHR(0.64278760968653932632/2)
1014 #define C6 FIXHR(0.5/2)
1015 #define C7 FIXHR(0.34202014332566873304/2)
1016 #define C8 FIXHR(0.17364817766693034885/2)
1019 /* using Lee like decomposition followed by hand coded 9 points DCT */
1020 static void imdct36(int *out
, int *buf
, int *in
, int *win
)
1022 int i
, j
, t0
, t1
, t2
, t3
, s0
, s1
, s2
, s3
;
1023 int tmp
[18], *tmp1
, *in1
;
1034 //more accurate but slower
1035 int64_t t0
, t1
, t2
, t3
;
1036 t2
= in1
[2*4] + in1
[2*8] - in1
[2*2];
1038 t3
= (in1
[2*0] + (int64_t)(in1
[2*6]>>1))<<32;
1039 t1
= in1
[2*0] - in1
[2*6];
1040 tmp1
[ 6] = t1
- (t2
>>1);
1043 t0
= MUL64(2*(in1
[2*2] + in1
[2*4]), C2
);
1044 t1
= MUL64( in1
[2*4] - in1
[2*8] , -2*C8
);
1045 t2
= MUL64(2*(in1
[2*2] + in1
[2*8]), -C4
);
1047 tmp1
[10] = (t3
- t0
- t2
) >> 32;
1048 tmp1
[ 2] = (t3
+ t0
+ t1
) >> 32;
1049 tmp1
[14] = (t3
+ t2
- t1
) >> 32;
1051 tmp1
[ 4] = MULH(2*(in1
[2*5] + in1
[2*7] - in1
[2*1]), -C3
);
1052 t2
= MUL64(2*(in1
[2*1] + in1
[2*5]), C1
);
1053 t3
= MUL64( in1
[2*5] - in1
[2*7] , -2*C7
);
1054 t0
= MUL64(2*in1
[2*3], C3
);
1056 t1
= MUL64(2*(in1
[2*1] + in1
[2*7]), -C5
);
1058 tmp1
[ 0] = (t2
+ t3
+ t0
) >> 32;
1059 tmp1
[12] = (t2
+ t1
- t0
) >> 32;
1060 tmp1
[ 8] = (t3
- t1
- t0
) >> 32;
1062 t2
= in1
[2*4] + in1
[2*8] - in1
[2*2];
1064 t3
= in1
[2*0] + (in1
[2*6]>>1);
1065 t1
= in1
[2*0] - in1
[2*6];
1066 tmp1
[ 6] = t1
- (t2
>>1);
1069 t0
= MULH(2*(in1
[2*2] + in1
[2*4]), C2
);
1070 t1
= MULH( in1
[2*4] - in1
[2*8] , -2*C8
);
1071 t2
= MULH(2*(in1
[2*2] + in1
[2*8]), -C4
);
1073 tmp1
[10] = t3
- t0
- t2
;
1074 tmp1
[ 2] = t3
+ t0
+ t1
;
1075 tmp1
[14] = t3
+ t2
- t1
;
1077 tmp1
[ 4] = MULH(2*(in1
[2*5] + in1
[2*7] - in1
[2*1]), -C3
);
1078 t2
= MULH(2*(in1
[2*1] + in1
[2*5]), C1
);
1079 t3
= MULH( in1
[2*5] - in1
[2*7] , -2*C7
);
1080 t0
= MULH(2*in1
[2*3], C3
);
1082 t1
= MULH(2*(in1
[2*1] + in1
[2*7]), -C5
);
1084 tmp1
[ 0] = t2
+ t3
+ t0
;
1085 tmp1
[12] = t2
+ t1
- t0
;
1086 tmp1
[ 8] = t3
- t1
- t0
;
1099 s1
= MULH(2*(t3
+ t2
), icos36h
[j
]);
1100 s3
= MULL(t3
- t2
, icos36
[8 - j
], FRAC_BITS
);
1104 out
[(9 + j
)*SBLIMIT
] = MULH(t1
, win
[9 + j
]) + buf
[9 + j
];
1105 out
[(8 - j
)*SBLIMIT
] = MULH(t1
, win
[8 - j
]) + buf
[8 - j
];
1106 buf
[9 + j
] = MULH(t0
, win
[18 + 9 + j
]);
1107 buf
[8 - j
] = MULH(t0
, win
[18 + 8 - j
]);
1111 out
[(9 + 8 - j
)*SBLIMIT
] = MULH(t1
, win
[9 + 8 - j
]) + buf
[9 + 8 - j
];
1112 out
[( j
)*SBLIMIT
] = MULH(t1
, win
[ j
]) + buf
[ j
];
1113 buf
[9 + 8 - j
] = MULH(t0
, win
[18 + 9 + 8 - j
]);
1114 buf
[ + j
] = MULH(t0
, win
[18 + j
]);
1119 s1
= MULH(2*tmp
[17], icos36h
[4]);
1122 out
[(9 + 4)*SBLIMIT
] = MULH(t1
, win
[9 + 4]) + buf
[9 + 4];
1123 out
[(8 - 4)*SBLIMIT
] = MULH(t1
, win
[8 - 4]) + buf
[8 - 4];
1124 buf
[9 + 4] = MULH(t0
, win
[18 + 9 + 4]);
1125 buf
[8 - 4] = MULH(t0
, win
[18 + 8 - 4]);
1128 /* return the number of decoded frames */
1129 static int mp_decode_layer1(MPADecodeContext
*s
)
1131 int bound
, i
, v
, n
, ch
, j
, mant
;
1132 uint8_t allocation
[MPA_MAX_CHANNELS
][SBLIMIT
];
1133 uint8_t scale_factors
[MPA_MAX_CHANNELS
][SBLIMIT
];
1135 if (s
->mode
== MPA_JSTEREO
)
1136 bound
= (s
->mode_ext
+ 1) * 4;
1140 /* allocation bits */
1141 for(i
=0;i
<bound
;i
++) {
1142 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1143 allocation
[ch
][i
] = get_bits(&s
->gb
, 4);
1146 for(i
=bound
;i
<SBLIMIT
;i
++) {
1147 allocation
[0][i
] = get_bits(&s
->gb
, 4);
1151 for(i
=0;i
<bound
;i
++) {
1152 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1153 if (allocation
[ch
][i
])
1154 scale_factors
[ch
][i
] = get_bits(&s
->gb
, 6);
1157 for(i
=bound
;i
<SBLIMIT
;i
++) {
1158 if (allocation
[0][i
]) {
1159 scale_factors
[0][i
] = get_bits(&s
->gb
, 6);
1160 scale_factors
[1][i
] = get_bits(&s
->gb
, 6);
1164 /* compute samples */
1166 for(i
=0;i
<bound
;i
++) {
1167 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1168 n
= allocation
[ch
][i
];
1170 mant
= get_bits(&s
->gb
, n
+ 1);
1171 v
= l1_unscale(n
, mant
, scale_factors
[ch
][i
]);
1175 s
->sb_samples
[ch
][j
][i
] = v
;
1178 for(i
=bound
;i
<SBLIMIT
;i
++) {
1179 n
= allocation
[0][i
];
1181 mant
= get_bits(&s
->gb
, n
+ 1);
1182 v
= l1_unscale(n
, mant
, scale_factors
[0][i
]);
1183 s
->sb_samples
[0][j
][i
] = v
;
1184 v
= l1_unscale(n
, mant
, scale_factors
[1][i
]);
1185 s
->sb_samples
[1][j
][i
] = v
;
1187 s
->sb_samples
[0][j
][i
] = 0;
1188 s
->sb_samples
[1][j
][i
] = 0;
1195 static int mp_decode_layer2(MPADecodeContext
*s
)
1197 int sblimit
; /* number of used subbands */
1198 const unsigned char *alloc_table
;
1199 int table
, bit_alloc_bits
, i
, j
, ch
, bound
, v
;
1200 unsigned char bit_alloc
[MPA_MAX_CHANNELS
][SBLIMIT
];
1201 unsigned char scale_code
[MPA_MAX_CHANNELS
][SBLIMIT
];
1202 unsigned char scale_factors
[MPA_MAX_CHANNELS
][SBLIMIT
][3], *sf
;
1203 int scale
, qindex
, bits
, steps
, k
, l
, m
, b
;
1205 /* select decoding table */
1206 table
= ff_mpa_l2_select_table(s
->bit_rate
/ 1000, s
->nb_channels
,
1207 s
->sample_rate
, s
->lsf
);
1208 sblimit
= ff_mpa_sblimit_table
[table
];
1209 alloc_table
= ff_mpa_alloc_tables
[table
];
1211 if (s
->mode
== MPA_JSTEREO
)
1212 bound
= (s
->mode_ext
+ 1) * 4;
1216 dprintf(s
->avctx
, "bound=%d sblimit=%d\n", bound
, sblimit
);
1219 if( bound
> sblimit
) bound
= sblimit
;
1221 /* parse bit allocation */
1223 for(i
=0;i
<bound
;i
++) {
1224 bit_alloc_bits
= alloc_table
[j
];
1225 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1226 bit_alloc
[ch
][i
] = get_bits(&s
->gb
, bit_alloc_bits
);
1228 j
+= 1 << bit_alloc_bits
;
1230 for(i
=bound
;i
<sblimit
;i
++) {
1231 bit_alloc_bits
= alloc_table
[j
];
1232 v
= get_bits(&s
->gb
, bit_alloc_bits
);
1233 bit_alloc
[0][i
] = v
;
1234 bit_alloc
[1][i
] = v
;
1235 j
+= 1 << bit_alloc_bits
;
1239 for(i
=0;i
<sblimit
;i
++) {
1240 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1241 if (bit_alloc
[ch
][i
])
1242 scale_code
[ch
][i
] = get_bits(&s
->gb
, 2);
1247 for(i
=0;i
<sblimit
;i
++) {
1248 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1249 if (bit_alloc
[ch
][i
]) {
1250 sf
= scale_factors
[ch
][i
];
1251 switch(scale_code
[ch
][i
]) {
1254 sf
[0] = get_bits(&s
->gb
, 6);
1255 sf
[1] = get_bits(&s
->gb
, 6);
1256 sf
[2] = get_bits(&s
->gb
, 6);
1259 sf
[0] = get_bits(&s
->gb
, 6);
1264 sf
[0] = get_bits(&s
->gb
, 6);
1265 sf
[2] = get_bits(&s
->gb
, 6);
1269 sf
[0] = get_bits(&s
->gb
, 6);
1270 sf
[2] = get_bits(&s
->gb
, 6);
1280 for(l
=0;l
<12;l
+=3) {
1282 for(i
=0;i
<bound
;i
++) {
1283 bit_alloc_bits
= alloc_table
[j
];
1284 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1285 b
= bit_alloc
[ch
][i
];
1287 scale
= scale_factors
[ch
][i
][k
];
1288 qindex
= alloc_table
[j
+b
];
1289 bits
= ff_mpa_quant_bits
[qindex
];
1291 /* 3 values at the same time */
1292 v
= get_bits(&s
->gb
, -bits
);
1293 steps
= ff_mpa_quant_steps
[qindex
];
1294 s
->sb_samples
[ch
][k
* 12 + l
+ 0][i
] =
1295 l2_unscale_group(steps
, v
% steps
, scale
);
1297 s
->sb_samples
[ch
][k
* 12 + l
+ 1][i
] =
1298 l2_unscale_group(steps
, v
% steps
, scale
);
1300 s
->sb_samples
[ch
][k
* 12 + l
+ 2][i
] =
1301 l2_unscale_group(steps
, v
, scale
);
1304 v
= get_bits(&s
->gb
, bits
);
1305 v
= l1_unscale(bits
- 1, v
, scale
);
1306 s
->sb_samples
[ch
][k
* 12 + l
+ m
][i
] = v
;
1310 s
->sb_samples
[ch
][k
* 12 + l
+ 0][i
] = 0;
1311 s
->sb_samples
[ch
][k
* 12 + l
+ 1][i
] = 0;
1312 s
->sb_samples
[ch
][k
* 12 + l
+ 2][i
] = 0;
1315 /* next subband in alloc table */
1316 j
+= 1 << bit_alloc_bits
;
1318 /* XXX: find a way to avoid this duplication of code */
1319 for(i
=bound
;i
<sblimit
;i
++) {
1320 bit_alloc_bits
= alloc_table
[j
];
1321 b
= bit_alloc
[0][i
];
1323 int mant
, scale0
, scale1
;
1324 scale0
= scale_factors
[0][i
][k
];
1325 scale1
= scale_factors
[1][i
][k
];
1326 qindex
= alloc_table
[j
+b
];
1327 bits
= ff_mpa_quant_bits
[qindex
];
1329 /* 3 values at the same time */
1330 v
= get_bits(&s
->gb
, -bits
);
1331 steps
= ff_mpa_quant_steps
[qindex
];
1334 s
->sb_samples
[0][k
* 12 + l
+ 0][i
] =
1335 l2_unscale_group(steps
, mant
, scale0
);
1336 s
->sb_samples
[1][k
* 12 + l
+ 0][i
] =
1337 l2_unscale_group(steps
, mant
, scale1
);
1340 s
->sb_samples
[0][k
* 12 + l
+ 1][i
] =
1341 l2_unscale_group(steps
, mant
, scale0
);
1342 s
->sb_samples
[1][k
* 12 + l
+ 1][i
] =
1343 l2_unscale_group(steps
, mant
, scale1
);
1344 s
->sb_samples
[0][k
* 12 + l
+ 2][i
] =
1345 l2_unscale_group(steps
, v
, scale0
);
1346 s
->sb_samples
[1][k
* 12 + l
+ 2][i
] =
1347 l2_unscale_group(steps
, v
, scale1
);
1350 mant
= get_bits(&s
->gb
, bits
);
1351 s
->sb_samples
[0][k
* 12 + l
+ m
][i
] =
1352 l1_unscale(bits
- 1, mant
, scale0
);
1353 s
->sb_samples
[1][k
* 12 + l
+ m
][i
] =
1354 l1_unscale(bits
- 1, mant
, scale1
);
1358 s
->sb_samples
[0][k
* 12 + l
+ 0][i
] = 0;
1359 s
->sb_samples
[0][k
* 12 + l
+ 1][i
] = 0;
1360 s
->sb_samples
[0][k
* 12 + l
+ 2][i
] = 0;
1361 s
->sb_samples
[1][k
* 12 + l
+ 0][i
] = 0;
1362 s
->sb_samples
[1][k
* 12 + l
+ 1][i
] = 0;
1363 s
->sb_samples
[1][k
* 12 + l
+ 2][i
] = 0;
1365 /* next subband in alloc table */
1366 j
+= 1 << bit_alloc_bits
;
1368 /* fill remaining samples to zero */
1369 for(i
=sblimit
;i
<SBLIMIT
;i
++) {
1370 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1371 s
->sb_samples
[ch
][k
* 12 + l
+ 0][i
] = 0;
1372 s
->sb_samples
[ch
][k
* 12 + l
+ 1][i
] = 0;
1373 s
->sb_samples
[ch
][k
* 12 + l
+ 2][i
] = 0;
1381 static inline void lsf_sf_expand(int *slen
,
1382 int sf
, int n1
, int n2
, int n3
)
1401 static void exponents_from_scale_factors(MPADecodeContext
*s
,
1405 const uint8_t *bstab
, *pretab
;
1406 int len
, i
, j
, k
, l
, v0
, shift
, gain
, gains
[3];
1409 exp_ptr
= exponents
;
1410 gain
= g
->global_gain
- 210;
1411 shift
= g
->scalefac_scale
+ 1;
1413 bstab
= band_size_long
[s
->sample_rate_index
];
1414 pretab
= mpa_pretab
[g
->preflag
];
1415 for(i
=0;i
<g
->long_end
;i
++) {
1416 v0
= gain
- ((g
->scale_factors
[i
] + pretab
[i
]) << shift
) + 400;
1422 if (g
->short_start
< 13) {
1423 bstab
= band_size_short
[s
->sample_rate_index
];
1424 gains
[0] = gain
- (g
->subblock_gain
[0] << 3);
1425 gains
[1] = gain
- (g
->subblock_gain
[1] << 3);
1426 gains
[2] = gain
- (g
->subblock_gain
[2] << 3);
1428 for(i
=g
->short_start
;i
<13;i
++) {
1431 v0
= gains
[l
] - (g
->scale_factors
[k
++] << shift
) + 400;
1439 /* handle n = 0 too */
1440 static inline int get_bitsz(GetBitContext
*s
, int n
)
1445 return get_bits(s
, n
);
1449 static void switch_buffer(MPADecodeContext
*s
, int *pos
, int *end_pos
, int *end_pos2
){
1450 if(s
->in_gb
.buffer
&& *pos
>= s
->gb
.size_in_bits
){
1452 s
->in_gb
.buffer
=NULL
;
1453 assert((get_bits_count(&s
->gb
) & 7) == 0);
1454 skip_bits_long(&s
->gb
, *pos
- *end_pos
);
1456 *end_pos
= *end_pos2
+ get_bits_count(&s
->gb
) - *pos
;
1457 *pos
= get_bits_count(&s
->gb
);
1461 static int huffman_decode(MPADecodeContext
*s
, GranuleDef
*g
,
1462 int16_t *exponents
, int end_pos2
)
1466 int last_pos
, bits_left
;
1468 int end_pos
= FFMIN(end_pos2
, s
->gb
.size_in_bits
);
1470 /* low frequencies (called big values) */
1473 int j
, k
, l
, linbits
;
1474 j
= g
->region_size
[i
];
1477 /* select vlc table */
1478 k
= g
->table_select
[i
];
1479 l
= mpa_huff_data
[k
][0];
1480 linbits
= mpa_huff_data
[k
][1];
1484 memset(&g
->sb_hybrid
[s_index
], 0, sizeof(*g
->sb_hybrid
)*2*j
);
1489 /* read huffcode and compute each couple */
1491 int exponent
, x
, y
, v
;
1492 int pos
= get_bits_count(&s
->gb
);
1494 if (pos
>= end_pos
){
1495 // av_log(NULL, AV_LOG_ERROR, "pos: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1496 switch_buffer(s
, &pos
, &end_pos
, &end_pos2
);
1497 // av_log(NULL, AV_LOG_ERROR, "new pos: %d %d\n", pos, end_pos);
1501 y
= get_vlc2(&s
->gb
, vlc
->table
, 7, 3);
1504 g
->sb_hybrid
[s_index
] =
1505 g
->sb_hybrid
[s_index
+1] = 0;
1510 exponent
= exponents
[s_index
];
1512 dprintf(s
->avctx
, "region=%d n=%d x=%d y=%d exp=%d\n",
1513 i
, g
->region_size
[i
] - j
, x
, y
, exponent
);
1518 v
= expval_table
[ exponent
][ x
];
1519 // v = expval_table[ (exponent&3) ][ x ] >> FFMIN(0 - (exponent>>2), 31);
1521 x
+= get_bitsz(&s
->gb
, linbits
);
1522 v
= l3_unscale(x
, exponent
);
1524 if (get_bits1(&s
->gb
))
1526 g
->sb_hybrid
[s_index
] = v
;
1528 v
= expval_table
[ exponent
][ y
];
1530 y
+= get_bitsz(&s
->gb
, linbits
);
1531 v
= l3_unscale(y
, exponent
);
1533 if (get_bits1(&s
->gb
))
1535 g
->sb_hybrid
[s_index
+1] = v
;
1541 v
= expval_table
[ exponent
][ x
];
1543 x
+= get_bitsz(&s
->gb
, linbits
);
1544 v
= l3_unscale(x
, exponent
);
1546 if (get_bits1(&s
->gb
))
1548 g
->sb_hybrid
[s_index
+!!y
] = v
;
1549 g
->sb_hybrid
[s_index
+ !y
] = 0;
1555 /* high frequencies */
1556 vlc
= &huff_quad_vlc
[g
->count1table_select
];
1558 while (s_index
<= 572) {
1560 pos
= get_bits_count(&s
->gb
);
1561 if (pos
>= end_pos
) {
1562 if (pos
> end_pos2
&& last_pos
){
1563 /* some encoders generate an incorrect size for this
1564 part. We must go back into the data */
1566 skip_bits_long(&s
->gb
, last_pos
- pos
);
1567 av_log(s
->avctx
, AV_LOG_INFO
, "overread, skip %d enddists: %d %d\n", last_pos
- pos
, end_pos
-pos
, end_pos2
-pos
);
1568 if(s
->error_recognition
>= FF_ER_COMPLIANT
)
1572 // av_log(NULL, AV_LOG_ERROR, "pos2: %d %d %d %d\n", pos, end_pos, end_pos2, s_index);
1573 switch_buffer(s
, &pos
, &end_pos
, &end_pos2
);
1574 // av_log(NULL, AV_LOG_ERROR, "new pos2: %d %d %d\n", pos, end_pos, s_index);
1580 code
= get_vlc2(&s
->gb
, vlc
->table
, vlc
->bits
, 1);
1581 dprintf(s
->avctx
, "t=%d code=%d\n", g
->count1table_select
, code
);
1582 g
->sb_hybrid
[s_index
+0]=
1583 g
->sb_hybrid
[s_index
+1]=
1584 g
->sb_hybrid
[s_index
+2]=
1585 g
->sb_hybrid
[s_index
+3]= 0;
1587 static const int idxtab
[16]={3,3,2,2,1,1,1,1,0,0,0,0,0,0,0,0};
1589 int pos
= s_index
+idxtab
[code
];
1590 code
^= 8>>idxtab
[code
];
1591 v
= exp_table
[ exponents
[pos
] ];
1592 // v = exp_table[ (exponents[pos]&3) ] >> FFMIN(0 - (exponents[pos]>>2), 31);
1593 if(get_bits1(&s
->gb
))
1595 g
->sb_hybrid
[pos
] = v
;
1599 /* skip extension bits */
1600 bits_left
= end_pos2
- get_bits_count(&s
->gb
);
1601 //av_log(NULL, AV_LOG_ERROR, "left:%d buf:%p\n", bits_left, s->in_gb.buffer);
1602 if (bits_left
< 0 && s
->error_recognition
>= FF_ER_COMPLIANT
) {
1603 av_log(s
->avctx
, AV_LOG_ERROR
, "bits_left=%d\n", bits_left
);
1605 }else if(bits_left
> 0 && s
->error_recognition
>= FF_ER_AGGRESSIVE
){
1606 av_log(s
->avctx
, AV_LOG_ERROR
, "bits_left=%d\n", bits_left
);
1609 memset(&g
->sb_hybrid
[s_index
], 0, sizeof(*g
->sb_hybrid
)*(576 - s_index
));
1610 skip_bits_long(&s
->gb
, bits_left
);
1612 i
= get_bits_count(&s
->gb
);
1613 switch_buffer(s
, &i
, &end_pos
, &end_pos2
);
1618 /* Reorder short blocks from bitstream order to interleaved order. It
1619 would be faster to do it in parsing, but the code would be far more
1621 static void reorder_block(MPADecodeContext
*s
, GranuleDef
*g
)
1624 int32_t *ptr
, *dst
, *ptr1
;
1627 if (g
->block_type
!= 2)
1630 if (g
->switch_point
) {
1631 if (s
->sample_rate_index
!= 8) {
1632 ptr
= g
->sb_hybrid
+ 36;
1634 ptr
= g
->sb_hybrid
+ 48;
1640 for(i
=g
->short_start
;i
<13;i
++) {
1641 len
= band_size_short
[s
->sample_rate_index
][i
];
1644 for(j
=len
;j
>0;j
--) {
1645 *dst
++ = ptr
[0*len
];
1646 *dst
++ = ptr
[1*len
];
1647 *dst
++ = ptr
[2*len
];
1651 memcpy(ptr1
, tmp
, len
* 3 * sizeof(*ptr1
));
1655 #define ISQRT2 FIXR(0.70710678118654752440)
1657 static void compute_stereo(MPADecodeContext
*s
,
1658 GranuleDef
*g0
, GranuleDef
*g1
)
1662 int sf_max
, tmp0
, tmp1
, sf
, len
, non_zero_found
;
1663 int32_t (*is_tab
)[16];
1664 int32_t *tab0
, *tab1
;
1665 int non_zero_found_short
[3];
1667 /* intensity stereo */
1668 if (s
->mode_ext
& MODE_EXT_I_STEREO
) {
1673 is_tab
= is_table_lsf
[g1
->scalefac_compress
& 1];
1677 tab0
= g0
->sb_hybrid
+ 576;
1678 tab1
= g1
->sb_hybrid
+ 576;
1680 non_zero_found_short
[0] = 0;
1681 non_zero_found_short
[1] = 0;
1682 non_zero_found_short
[2] = 0;
1683 k
= (13 - g1
->short_start
) * 3 + g1
->long_end
- 3;
1684 for(i
= 12;i
>= g1
->short_start
;i
--) {
1685 /* for last band, use previous scale factor */
1688 len
= band_size_short
[s
->sample_rate_index
][i
];
1692 if (!non_zero_found_short
[l
]) {
1693 /* test if non zero band. if so, stop doing i-stereo */
1694 for(j
=0;j
<len
;j
++) {
1696 non_zero_found_short
[l
] = 1;
1700 sf
= g1
->scale_factors
[k
+ l
];
1706 for(j
=0;j
<len
;j
++) {
1708 tab0
[j
] = MULL(tmp0
, v1
, FRAC_BITS
);
1709 tab1
[j
] = MULL(tmp0
, v2
, FRAC_BITS
);
1713 if (s
->mode_ext
& MODE_EXT_MS_STEREO
) {
1714 /* lower part of the spectrum : do ms stereo
1716 for(j
=0;j
<len
;j
++) {
1719 tab0
[j
] = MULL(tmp0
+ tmp1
, ISQRT2
, FRAC_BITS
);
1720 tab1
[j
] = MULL(tmp0
- tmp1
, ISQRT2
, FRAC_BITS
);
1727 non_zero_found
= non_zero_found_short
[0] |
1728 non_zero_found_short
[1] |
1729 non_zero_found_short
[2];
1731 for(i
= g1
->long_end
- 1;i
>= 0;i
--) {
1732 len
= band_size_long
[s
->sample_rate_index
][i
];
1735 /* test if non zero band. if so, stop doing i-stereo */
1736 if (!non_zero_found
) {
1737 for(j
=0;j
<len
;j
++) {
1743 /* for last band, use previous scale factor */
1744 k
= (i
== 21) ? 20 : i
;
1745 sf
= g1
->scale_factors
[k
];
1750 for(j
=0;j
<len
;j
++) {
1752 tab0
[j
] = MULL(tmp0
, v1
, FRAC_BITS
);
1753 tab1
[j
] = MULL(tmp0
, v2
, FRAC_BITS
);
1757 if (s
->mode_ext
& MODE_EXT_MS_STEREO
) {
1758 /* lower part of the spectrum : do ms stereo
1760 for(j
=0;j
<len
;j
++) {
1763 tab0
[j
] = MULL(tmp0
+ tmp1
, ISQRT2
, FRAC_BITS
);
1764 tab1
[j
] = MULL(tmp0
- tmp1
, ISQRT2
, FRAC_BITS
);
1769 } else if (s
->mode_ext
& MODE_EXT_MS_STEREO
) {
1770 /* ms stereo ONLY */
1771 /* NOTE: the 1/sqrt(2) normalization factor is included in the
1773 tab0
= g0
->sb_hybrid
;
1774 tab1
= g1
->sb_hybrid
;
1775 for(i
=0;i
<576;i
++) {
1778 tab0
[i
] = tmp0
+ tmp1
;
1779 tab1
[i
] = tmp0
- tmp1
;
1784 static void compute_antialias_integer(MPADecodeContext
*s
,
1790 /* we antialias only "long" bands */
1791 if (g
->block_type
== 2) {
1792 if (!g
->switch_point
)
1794 /* XXX: check this for 8000Hz case */
1800 ptr
= g
->sb_hybrid
+ 18;
1801 for(i
= n
;i
> 0;i
--) {
1802 int tmp0
, tmp1
, tmp2
;
1803 csa
= &csa_table
[0][0];
1807 tmp2= MULH(tmp0 + tmp1, csa[0+4*j]);\
1808 ptr[-1-j] = 4*(tmp2 - MULH(tmp1, csa[2+4*j]));\
1809 ptr[ j] = 4*(tmp2 + MULH(tmp0, csa[3+4*j]));
1824 static void compute_antialias_float(MPADecodeContext
*s
,
1830 /* we antialias only "long" bands */
1831 if (g
->block_type
== 2) {
1832 if (!g
->switch_point
)
1834 /* XXX: check this for 8000Hz case */
1840 ptr
= g
->sb_hybrid
+ 18;
1841 for(i
= n
;i
> 0;i
--) {
1843 float *csa
= &csa_table_float
[0][0];
1844 #define FLOAT_AA(j)\
1847 ptr[-1-j] = lrintf(tmp0 * csa[0+4*j] - tmp1 * csa[1+4*j]);\
1848 ptr[ j] = lrintf(tmp0 * csa[1+4*j] + tmp1 * csa[0+4*j]);
1863 static void compute_imdct(MPADecodeContext
*s
,
1865 int32_t *sb_samples
,
1868 int32_t *ptr
, *win
, *win1
, *buf
, *out_ptr
, *ptr1
;
1870 int i
, j
, mdct_long_end
, v
, sblimit
;
1872 /* find last non zero block */
1873 ptr
= g
->sb_hybrid
+ 576;
1874 ptr1
= g
->sb_hybrid
+ 2 * 18;
1875 while (ptr
>= ptr1
) {
1877 v
= ptr
[0] | ptr
[1] | ptr
[2] | ptr
[3] | ptr
[4] | ptr
[5];
1881 sblimit
= ((ptr
- g
->sb_hybrid
) / 18) + 1;
1883 if (g
->block_type
== 2) {
1884 /* XXX: check for 8000 Hz */
1885 if (g
->switch_point
)
1890 mdct_long_end
= sblimit
;
1895 for(j
=0;j
<mdct_long_end
;j
++) {
1896 /* apply window & overlap with previous buffer */
1897 out_ptr
= sb_samples
+ j
;
1899 if (g
->switch_point
&& j
< 2)
1902 win1
= mdct_win
[g
->block_type
];
1903 /* select frequency inversion */
1904 win
= win1
+ ((4 * 36) & -(j
& 1));
1905 imdct36(out_ptr
, buf
, ptr
, win
);
1906 out_ptr
+= 18*SBLIMIT
;
1910 for(j
=mdct_long_end
;j
<sblimit
;j
++) {
1911 /* select frequency inversion */
1912 win
= mdct_win
[2] + ((4 * 36) & -(j
& 1));
1913 out_ptr
= sb_samples
+ j
;
1919 imdct12(out2
, ptr
+ 0);
1921 *out_ptr
= MULH(out2
[i
], win
[i
]) + buf
[i
+ 6*1];
1922 buf
[i
+ 6*2] = MULH(out2
[i
+ 6], win
[i
+ 6]);
1925 imdct12(out2
, ptr
+ 1);
1927 *out_ptr
= MULH(out2
[i
], win
[i
]) + buf
[i
+ 6*2];
1928 buf
[i
+ 6*0] = MULH(out2
[i
+ 6], win
[i
+ 6]);
1931 imdct12(out2
, ptr
+ 2);
1933 buf
[i
+ 6*0] = MULH(out2
[i
], win
[i
]) + buf
[i
+ 6*0];
1934 buf
[i
+ 6*1] = MULH(out2
[i
+ 6], win
[i
+ 6]);
1941 for(j
=sblimit
;j
<SBLIMIT
;j
++) {
1943 out_ptr
= sb_samples
+ j
;
1953 /* main layer3 decoding function */
1954 static int mp_decode_layer3(MPADecodeContext
*s
)
1956 int nb_granules
, main_data_begin
, private_bits
;
1957 int gr
, ch
, blocksplit_flag
, i
, j
, k
, n
, bits_pos
;
1958 GranuleDef granules
[2][2], *g
;
1959 int16_t exponents
[576];
1961 /* read side info */
1963 main_data_begin
= get_bits(&s
->gb
, 8);
1964 private_bits
= get_bits(&s
->gb
, s
->nb_channels
);
1967 main_data_begin
= get_bits(&s
->gb
, 9);
1968 if (s
->nb_channels
== 2)
1969 private_bits
= get_bits(&s
->gb
, 3);
1971 private_bits
= get_bits(&s
->gb
, 5);
1973 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1974 granules
[ch
][0].scfsi
= 0; /* all scale factors are transmitted */
1975 granules
[ch
][1].scfsi
= get_bits(&s
->gb
, 4);
1979 for(gr
=0;gr
<nb_granules
;gr
++) {
1980 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
1981 dprintf(s
->avctx
, "gr=%d ch=%d: side_info\n", gr
, ch
);
1982 g
= &granules
[ch
][gr
];
1983 g
->part2_3_length
= get_bits(&s
->gb
, 12);
1984 g
->big_values
= get_bits(&s
->gb
, 9);
1985 if(g
->big_values
> 288){
1986 av_log(s
->avctx
, AV_LOG_ERROR
, "big_values too big\n");
1990 g
->global_gain
= get_bits(&s
->gb
, 8);
1991 /* if MS stereo only is selected, we precompute the
1992 1/sqrt(2) renormalization factor */
1993 if ((s
->mode_ext
& (MODE_EXT_MS_STEREO
| MODE_EXT_I_STEREO
)) ==
1995 g
->global_gain
-= 2;
1997 g
->scalefac_compress
= get_bits(&s
->gb
, 9);
1999 g
->scalefac_compress
= get_bits(&s
->gb
, 4);
2000 blocksplit_flag
= get_bits1(&s
->gb
);
2001 if (blocksplit_flag
) {
2002 g
->block_type
= get_bits(&s
->gb
, 2);
2003 if (g
->block_type
== 0){
2004 av_log(s
->avctx
, AV_LOG_ERROR
, "invalid block type\n");
2007 g
->switch_point
= get_bits1(&s
->gb
);
2009 g
->table_select
[i
] = get_bits(&s
->gb
, 5);
2011 g
->subblock_gain
[i
] = get_bits(&s
->gb
, 3);
2012 ff_init_short_region(s
, g
);
2014 int region_address1
, region_address2
;
2016 g
->switch_point
= 0;
2018 g
->table_select
[i
] = get_bits(&s
->gb
, 5);
2019 /* compute huffman coded region sizes */
2020 region_address1
= get_bits(&s
->gb
, 4);
2021 region_address2
= get_bits(&s
->gb
, 3);
2022 dprintf(s
->avctx
, "region1=%d region2=%d\n",
2023 region_address1
, region_address2
);
2024 ff_init_long_region(s
, g
, region_address1
, region_address2
);
2026 ff_region_offset2size(g
);
2027 ff_compute_band_indexes(s
, g
);
2031 g
->preflag
= get_bits1(&s
->gb
);
2032 g
->scalefac_scale
= get_bits1(&s
->gb
);
2033 g
->count1table_select
= get_bits1(&s
->gb
);
2034 dprintf(s
->avctx
, "block_type=%d switch_point=%d\n",
2035 g
->block_type
, g
->switch_point
);
2040 const uint8_t *ptr
= s
->gb
.buffer
+ (get_bits_count(&s
->gb
)>>3);
2041 assert((get_bits_count(&s
->gb
) & 7) == 0);
2042 /* now we get bits from the main_data_begin offset */
2043 dprintf(s
->avctx
, "seekback: %d\n", main_data_begin
);
2044 //av_log(NULL, AV_LOG_ERROR, "backstep:%d, lastbuf:%d\n", main_data_begin, s->last_buf_size);
2046 memcpy(s
->last_buf
+ s
->last_buf_size
, ptr
, EXTRABYTES
);
2048 init_get_bits(&s
->gb
, s
->last_buf
, s
->last_buf_size
*8);
2049 skip_bits_long(&s
->gb
, 8*(s
->last_buf_size
- main_data_begin
));
2052 for(gr
=0;gr
<nb_granules
;gr
++) {
2053 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
2054 g
= &granules
[ch
][gr
];
2055 if(get_bits_count(&s
->gb
)<0){
2056 av_log(s
->avctx
, AV_LOG_ERROR
, "mdb:%d, lastbuf:%d skipping granule %d\n",
2057 main_data_begin
, s
->last_buf_size
, gr
);
2058 skip_bits_long(&s
->gb
, g
->part2_3_length
);
2059 memset(g
->sb_hybrid
, 0, sizeof(g
->sb_hybrid
));
2060 if(get_bits_count(&s
->gb
) >= s
->gb
.size_in_bits
&& s
->in_gb
.buffer
){
2061 skip_bits_long(&s
->in_gb
, get_bits_count(&s
->gb
) - s
->gb
.size_in_bits
);
2063 s
->in_gb
.buffer
=NULL
;
2068 bits_pos
= get_bits_count(&s
->gb
);
2072 int slen
, slen1
, slen2
;
2074 /* MPEG1 scale factors */
2075 slen1
= slen_table
[0][g
->scalefac_compress
];
2076 slen2
= slen_table
[1][g
->scalefac_compress
];
2077 dprintf(s
->avctx
, "slen1=%d slen2=%d\n", slen1
, slen2
);
2078 if (g
->block_type
== 2) {
2079 n
= g
->switch_point
? 17 : 18;
2083 g
->scale_factors
[j
++] = get_bits(&s
->gb
, slen1
);
2086 g
->scale_factors
[j
++] = 0;
2090 g
->scale_factors
[j
++] = get_bits(&s
->gb
, slen2
);
2092 g
->scale_factors
[j
++] = 0;
2095 g
->scale_factors
[j
++] = 0;
2098 sc
= granules
[ch
][0].scale_factors
;
2101 n
= (k
== 0 ? 6 : 5);
2102 if ((g
->scfsi
& (0x8 >> k
)) == 0) {
2103 slen
= (k
< 2) ? slen1
: slen2
;
2106 g
->scale_factors
[j
++] = get_bits(&s
->gb
, slen
);
2109 g
->scale_factors
[j
++] = 0;
2112 /* simply copy from last granule */
2114 g
->scale_factors
[j
] = sc
[j
];
2119 g
->scale_factors
[j
++] = 0;
2122 int tindex
, tindex2
, slen
[4], sl
, sf
;
2124 /* LSF scale factors */
2125 if (g
->block_type
== 2) {
2126 tindex
= g
->switch_point
? 2 : 1;
2130 sf
= g
->scalefac_compress
;
2131 if ((s
->mode_ext
& MODE_EXT_I_STEREO
) && ch
== 1) {
2132 /* intensity stereo case */
2135 lsf_sf_expand(slen
, sf
, 6, 6, 0);
2137 } else if (sf
< 244) {
2138 lsf_sf_expand(slen
, sf
- 180, 4, 4, 0);
2141 lsf_sf_expand(slen
, sf
- 244, 3, 0, 0);
2147 lsf_sf_expand(slen
, sf
, 5, 4, 4);
2149 } else if (sf
< 500) {
2150 lsf_sf_expand(slen
, sf
- 400, 5, 4, 0);
2153 lsf_sf_expand(slen
, sf
- 500, 3, 0, 0);
2161 n
= lsf_nsf_table
[tindex2
][tindex
][k
];
2165 g
->scale_factors
[j
++] = get_bits(&s
->gb
, sl
);
2168 g
->scale_factors
[j
++] = 0;
2171 /* XXX: should compute exact size */
2173 g
->scale_factors
[j
] = 0;
2176 exponents_from_scale_factors(s
, g
, exponents
);
2178 /* read Huffman coded residue */
2179 huffman_decode(s
, g
, exponents
, bits_pos
+ g
->part2_3_length
);
2182 if (s
->nb_channels
== 2)
2183 compute_stereo(s
, &granules
[0][gr
], &granules
[1][gr
]);
2185 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
2186 g
= &granules
[ch
][gr
];
2188 reorder_block(s
, g
);
2189 s
->compute_antialias(s
, g
);
2190 compute_imdct(s
, g
, &s
->sb_samples
[ch
][18 * gr
][0], s
->mdct_buf
[ch
]);
2193 if(get_bits_count(&s
->gb
)<0)
2194 skip_bits_long(&s
->gb
, -get_bits_count(&s
->gb
));
2195 return nb_granules
* 18;
2198 static int mp_decode_frame(MPADecodeContext
*s
,
2199 OUT_INT
*samples
, const uint8_t *buf
, int buf_size
)
2201 int i
, nb_frames
, ch
;
2202 OUT_INT
*samples_ptr
;
2204 init_get_bits(&s
->gb
, buf
+ HEADER_SIZE
, (buf_size
- HEADER_SIZE
)*8);
2206 /* skip error protection field */
2207 if (s
->error_protection
)
2208 skip_bits(&s
->gb
, 16);
2210 dprintf(s
->avctx
, "frame %d:\n", s
->frame_count
);
2213 s
->avctx
->frame_size
= 384;
2214 nb_frames
= mp_decode_layer1(s
);
2217 s
->avctx
->frame_size
= 1152;
2218 nb_frames
= mp_decode_layer2(s
);
2221 s
->avctx
->frame_size
= s
->lsf
? 576 : 1152;
2223 nb_frames
= mp_decode_layer3(s
);
2226 if(s
->in_gb
.buffer
){
2227 align_get_bits(&s
->gb
);
2228 i
= (s
->gb
.size_in_bits
- get_bits_count(&s
->gb
))>>3;
2229 if(i
>= 0 && i
<= BACKSTEP_SIZE
){
2230 memmove(s
->last_buf
, s
->gb
.buffer
+ (get_bits_count(&s
->gb
)>>3), i
);
2233 av_log(s
->avctx
, AV_LOG_ERROR
, "invalid old backstep %d\n", i
);
2235 s
->in_gb
.buffer
= NULL
;
2238 align_get_bits(&s
->gb
);
2239 assert((get_bits_count(&s
->gb
) & 7) == 0);
2240 i
= (s
->gb
.size_in_bits
- get_bits_count(&s
->gb
))>>3;
2242 if(i
<0 || i
> BACKSTEP_SIZE
|| nb_frames
<0){
2244 av_log(s
->avctx
, AV_LOG_ERROR
, "invalid new backstep %d\n", i
);
2245 i
= FFMIN(BACKSTEP_SIZE
, buf_size
- HEADER_SIZE
);
2247 assert(i
<= buf_size
- HEADER_SIZE
&& i
>= 0);
2248 memcpy(s
->last_buf
+ s
->last_buf_size
, s
->gb
.buffer
+ buf_size
- HEADER_SIZE
- i
, i
);
2249 s
->last_buf_size
+= i
;
2254 /* apply the synthesis filter */
2255 for(ch
=0;ch
<s
->nb_channels
;ch
++) {
2256 samples_ptr
= samples
+ ch
;
2257 for(i
=0;i
<nb_frames
;i
++) {
2258 ff_mpa_synth_filter(s
->synth_buf
[ch
], &(s
->synth_buf_offset
[ch
]),
2259 window
, &s
->dither_state
,
2260 samples_ptr
, s
->nb_channels
,
2261 s
->sb_samples
[ch
][i
]);
2262 samples_ptr
+= 32 * s
->nb_channels
;
2266 return nb_frames
* 32 * sizeof(OUT_INT
) * s
->nb_channels
;
2269 static int decode_frame(AVCodecContext
* avctx
,
2270 void *data
, int *data_size
,
2271 const uint8_t * buf
, int buf_size
)
2273 MPADecodeContext
*s
= avctx
->priv_data
;
2276 OUT_INT
*out_samples
= data
;
2279 if(buf_size
< HEADER_SIZE
)
2282 header
= AV_RB32(buf
);
2283 if(ff_mpa_check_header(header
) < 0){
2286 av_log(avctx
, AV_LOG_ERROR
, "Header missing skipping one byte.\n");
2290 if (ff_mpegaudio_decode_header(s
, header
) == 1) {
2291 /* free format: prepare to compute frame size */
2295 /* update codec info */
2296 avctx
->channels
= s
->nb_channels
;
2297 avctx
->bit_rate
= s
->bit_rate
;
2298 avctx
->sub_id
= s
->layer
;
2300 if(s
->frame_size
<=0 || s
->frame_size
> buf_size
){
2301 av_log(avctx
, AV_LOG_ERROR
, "incomplete frame\n");
2303 }else if(s
->frame_size
< buf_size
){
2304 av_log(avctx
, AV_LOG_ERROR
, "incorrect frame size\n");
2305 buf_size
= s
->frame_size
;
2308 out_size
= mp_decode_frame(s
, out_samples
, buf
, buf_size
);
2310 *data_size
= out_size
;
2311 avctx
->sample_rate
= s
->sample_rate
;
2312 //FIXME maybe move the other codec info stuff from above here too
2314 av_log(avctx
, AV_LOG_DEBUG
, "Error while decoding MPEG audio frame.\n"); //FIXME return -1 / but also return the number of bytes consumed
2319 static void flush(AVCodecContext
*avctx
){
2320 MPADecodeContext
*s
= avctx
->priv_data
;
2321 memset(s
->synth_buf
, 0, sizeof(s
->synth_buf
));
2322 s
->last_buf_size
= 0;
2325 #ifdef CONFIG_MP3ADU_DECODER
2326 static int decode_frame_adu(AVCodecContext
* avctx
,
2327 void *data
, int *data_size
,
2328 const uint8_t * buf
, int buf_size
)
2330 MPADecodeContext
*s
= avctx
->priv_data
;
2333 OUT_INT
*out_samples
= data
;
2337 // Discard too short frames
2338 if (buf_size
< HEADER_SIZE
) {
2344 if (len
> MPA_MAX_CODED_FRAME_SIZE
)
2345 len
= MPA_MAX_CODED_FRAME_SIZE
;
2347 // Get header and restore sync word
2348 header
= AV_RB32(buf
) | 0xffe00000;
2350 if (ff_mpa_check_header(header
) < 0) { // Bad header, discard frame
2355 ff_mpegaudio_decode_header(s
, header
);
2356 /* update codec info */
2357 avctx
->sample_rate
= s
->sample_rate
;
2358 avctx
->channels
= s
->nb_channels
;
2359 avctx
->bit_rate
= s
->bit_rate
;
2360 avctx
->sub_id
= s
->layer
;
2362 s
->frame_size
= len
;
2364 if (avctx
->parse_only
) {
2365 out_size
= buf_size
;
2367 out_size
= mp_decode_frame(s
, out_samples
, buf
, buf_size
);
2370 *data_size
= out_size
;
2373 #endif /* CONFIG_MP3ADU_DECODER */
2375 #ifdef CONFIG_MP3ON4_DECODER
2378 * Context for MP3On4 decoder
2380 typedef struct MP3On4DecodeContext
{
2381 int frames
; ///< number of mp3 frames per block (number of mp3 decoder instances)
2382 int syncword
; ///< syncword patch
2383 const uint8_t *coff
; ///< channels offsets in output buffer
2384 MPADecodeContext
*mp3decctx
[5]; ///< MPADecodeContext for every decoder instance
2385 } MP3On4DecodeContext
;
2387 #include "mpeg4audio.h"
2389 /* Next 3 arrays are indexed by channel config number (passed via codecdata) */
2390 static const uint8_t mp3Frames
[8] = {0,1,1,2,3,3,4,5}; /* number of mp3 decoder instances */
2391 /* offsets into output buffer, assume output order is FL FR BL BR C LFE */
2392 static const uint8_t chan_offset
[8][5] = {
2397 {2,0,3}, // C FLR BS
2398 {4,0,2}, // C FLR BLRS
2399 {4,0,2,5}, // C FLR BLRS LFE
2400 {4,0,2,6,5}, // C FLR BLRS BLR LFE
2404 static int decode_init_mp3on4(AVCodecContext
* avctx
)
2406 MP3On4DecodeContext
*s
= avctx
->priv_data
;
2407 MPEG4AudioConfig cfg
;
2410 if ((avctx
->extradata_size
< 2) || (avctx
->extradata
== NULL
)) {
2411 av_log(avctx
, AV_LOG_ERROR
, "Codec extradata missing or too short.\n");
2415 ff_mpeg4audio_get_config(&cfg
, avctx
->extradata
, avctx
->extradata_size
);
2416 if (!cfg
.chan_config
|| cfg
.chan_config
> 7) {
2417 av_log(avctx
, AV_LOG_ERROR
, "Invalid channel config number.\n");
2420 s
->frames
= mp3Frames
[cfg
.chan_config
];
2421 s
->coff
= chan_offset
[cfg
.chan_config
];
2422 avctx
->channels
= ff_mpeg4audio_channels
[cfg
.chan_config
];
2424 if (cfg
.sample_rate
< 16000)
2425 s
->syncword
= 0xffe00000;
2427 s
->syncword
= 0xfff00000;
2429 /* Init the first mp3 decoder in standard way, so that all tables get builded
2430 * We replace avctx->priv_data with the context of the first decoder so that
2431 * decode_init() does not have to be changed.
2432 * Other decoders will be initialized here copying data from the first context
2434 // Allocate zeroed memory for the first decoder context
2435 s
->mp3decctx
[0] = av_mallocz(sizeof(MPADecodeContext
));
2436 // Put decoder context in place to make init_decode() happy
2437 avctx
->priv_data
= s
->mp3decctx
[0];
2439 // Restore mp3on4 context pointer
2440 avctx
->priv_data
= s
;
2441 s
->mp3decctx
[0]->adu_mode
= 1; // Set adu mode
2443 /* Create a separate codec/context for each frame (first is already ok).
2444 * Each frame is 1 or 2 channels - up to 5 frames allowed
2446 for (i
= 1; i
< s
->frames
; i
++) {
2447 s
->mp3decctx
[i
] = av_mallocz(sizeof(MPADecodeContext
));
2448 s
->mp3decctx
[i
]->compute_antialias
= s
->mp3decctx
[0]->compute_antialias
;
2449 s
->mp3decctx
[i
]->adu_mode
= 1;
2450 s
->mp3decctx
[i
]->avctx
= avctx
;
2457 static int decode_close_mp3on4(AVCodecContext
* avctx
)
2459 MP3On4DecodeContext
*s
= avctx
->priv_data
;
2462 for (i
= 0; i
< s
->frames
; i
++)
2463 if (s
->mp3decctx
[i
])
2464 av_free(s
->mp3decctx
[i
]);
2470 static int decode_frame_mp3on4(AVCodecContext
* avctx
,
2471 void *data
, int *data_size
,
2472 const uint8_t * buf
, int buf_size
)
2474 MP3On4DecodeContext
*s
= avctx
->priv_data
;
2475 MPADecodeContext
*m
;
2476 int fsize
, len
= buf_size
, out_size
= 0;
2478 OUT_INT
*out_samples
= data
;
2479 OUT_INT decoded_buf
[MPA_FRAME_SIZE
* MPA_MAX_CHANNELS
];
2480 OUT_INT
*outptr
, *bp
;
2484 // Discard too short frames
2485 if (buf_size
< HEADER_SIZE
)
2488 // If only one decoder interleave is not needed
2489 outptr
= s
->frames
== 1 ? out_samples
: decoded_buf
;
2491 avctx
->bit_rate
= 0;
2493 for (fr
= 0; fr
< s
->frames
; fr
++) {
2494 fsize
= AV_RB16(buf
) >> 4;
2495 fsize
= FFMIN3(fsize
, len
, MPA_MAX_CODED_FRAME_SIZE
);
2496 m
= s
->mp3decctx
[fr
];
2499 header
= (AV_RB32(buf
) & 0x000fffff) | s
->syncword
; // patch header
2501 if (ff_mpa_check_header(header
) < 0) // Bad header, discard block
2504 ff_mpegaudio_decode_header(m
, header
);
2505 out_size
+= mp_decode_frame(m
, outptr
, buf
, fsize
);
2510 n
= m
->avctx
->frame_size
*m
->nb_channels
;
2511 /* interleave output data */
2512 bp
= out_samples
+ s
->coff
[fr
];
2513 if(m
->nb_channels
== 1) {
2514 for(j
= 0; j
< n
; j
++) {
2515 *bp
= decoded_buf
[j
];
2516 bp
+= avctx
->channels
;
2519 for(j
= 0; j
< n
; j
++) {
2520 bp
[0] = decoded_buf
[j
++];
2521 bp
[1] = decoded_buf
[j
];
2522 bp
+= avctx
->channels
;
2526 avctx
->bit_rate
+= m
->bit_rate
;
2529 /* update codec info */
2530 avctx
->sample_rate
= s
->mp3decctx
[0]->sample_rate
;
2532 *data_size
= out_size
;
2535 #endif /* CONFIG_MP3ON4_DECODER */
2537 #ifdef CONFIG_MP2_DECODER
2538 AVCodec mp2_decoder
=
2543 sizeof(MPADecodeContext
),
2548 CODEC_CAP_PARSE_ONLY
,
2550 .long_name
= NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
2553 #ifdef CONFIG_MP3_DECODER
2554 AVCodec mp3_decoder
=
2559 sizeof(MPADecodeContext
),
2564 CODEC_CAP_PARSE_ONLY
,
2566 .long_name
= NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
2569 #ifdef CONFIG_MP3ADU_DECODER
2570 AVCodec mp3adu_decoder
=
2575 sizeof(MPADecodeContext
),
2580 CODEC_CAP_PARSE_ONLY
,
2582 .long_name
= NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
2585 #ifdef CONFIG_MP3ON4_DECODER
2586 AVCodec mp3on4_decoder
=
2591 sizeof(MP3On4DecodeContext
),
2594 decode_close_mp3on4
,
2595 decode_frame_mp3on4
,
2597 .long_name
= NULL_IF_CONFIG_SMALL("MP3onMP4"),