+++ /dev/null
-/*
- * MPEG Audio decoder
- * Copyright (c) 2001, 2002 Fabrice Bellard.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-/**
- * @file mpegaudiodec.c
- * MPEG Audio decoder.
- */
-
-//#define DEBUG
-#include "avcodec.h"
-#include "mpegaudio.h"
-
-/*
- * TODO:
- * - in low precision mode, use more 16 bit multiplies in synth filter
- * - test lsf / mpeg25 extensively.
- */
-
-/* define USE_HIGHPRECISION to have a bit exact (but slower) mpeg
- audio decoder */
-#ifdef CONFIG_MPEGAUDIO_HP
-#define USE_HIGHPRECISION
-#endif
-
-#ifdef USE_HIGHPRECISION
-#define FRAC_BITS 23 /* fractional bits for sb_samples and dct */
-#define WFRAC_BITS 16 /* fractional bits for window */
-#else
-#define FRAC_BITS 15 /* fractional bits for sb_samples and dct */
-#define WFRAC_BITS 14 /* fractional bits for window */
-#endif
-
-#define FRAC_ONE (1 << FRAC_BITS)
-
-#define MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> FRAC_BITS)
-#define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
-#define FIX(a) ((int)((a) * FRAC_ONE))
-/* WARNING: only correct for posititive numbers */
-#define FIXR(a) ((int)((a) * FRAC_ONE + 0.5))
-#define FRAC_RND(a) (((a) + (FRAC_ONE/2)) >> FRAC_BITS)
-
-#if FRAC_BITS <= 15
-typedef int16_t MPA_INT;
-#else
-typedef int32_t MPA_INT;
-#endif
-
-/****************/
-
-#define HEADER_SIZE 4
-#define BACKSTEP_SIZE 512
-
-typedef struct MPADecodeContext {
- uint8_t inbuf1[2][MPA_MAX_CODED_FRAME_SIZE + BACKSTEP_SIZE]; /* input buffer */
- int inbuf_index;
- uint8_t *inbuf_ptr, *inbuf;
- int frame_size;
- int free_format_frame_size; /* frame size in case of free format
- (zero if currently unknown) */
- /* next header (used in free format parsing) */
- uint32_t free_format_next_header;
- int error_protection;
- int layer;
- int sample_rate;
- int sample_rate_index; /* between 0 and 8 */
- int bit_rate;
- int old_frame_size;
- GetBitContext gb;
- int nb_channels;
- int mode;
- int mode_ext;
- int lsf;
- MPA_INT synth_buf[MPA_MAX_CHANNELS][512 * 2] __attribute__((aligned(16)));
- int synth_buf_offset[MPA_MAX_CHANNELS];
- int32_t sb_samples[MPA_MAX_CHANNELS][36][SBLIMIT] __attribute__((aligned(16)));
- int32_t mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */
-#ifdef DEBUG
- int frame_count;
-#endif
-} MPADecodeContext;
-
-/* layer 3 "granule" */
-typedef struct GranuleDef {
- uint8_t scfsi;
- int part2_3_length;
- int big_values;
- int global_gain;
- int scalefac_compress;
- uint8_t block_type;
- uint8_t switch_point;
- int table_select[3];
- int subblock_gain[3];
- uint8_t scalefac_scale;
- uint8_t count1table_select;
- int region_size[3]; /* number of huffman codes in each region */
- int preflag;
- int short_start, long_end; /* long/short band indexes */
- uint8_t scale_factors[40];
- int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */
-} GranuleDef;
-
-#define MODE_EXT_MS_STEREO 2
-#define MODE_EXT_I_STEREO 1
-
-/* layer 3 huffman tables */
-typedef struct HuffTable {
- int xsize;
- const uint8_t *bits;
- const uint16_t *codes;
-} HuffTable;
-
-#include "mpegaudiodectab.h"
-
-/* vlc structure for decoding layer 3 huffman tables */
-static VLC huff_vlc[16];
-static uint8_t *huff_code_table[16];
-static VLC huff_quad_vlc[2];
-/* computed from band_size_long */
-static uint16_t band_index_long[9][23];
-/* XXX: free when all decoders are closed */
-#define TABLE_4_3_SIZE (8191 + 16)
-static int8_t *table_4_3_exp;
-#if FRAC_BITS <= 15
-static uint16_t *table_4_3_value;
-#else
-static uint32_t *table_4_3_value;
-#endif
-/* intensity stereo coef table */
-static int32_t is_table[2][16];
-static int32_t is_table_lsf[2][2][16];
-static int32_t csa_table[8][2];
-static int32_t mdct_win[8][36];
-
-/* lower 2 bits: modulo 3, higher bits: shift */
-static uint16_t scale_factor_modshift[64];
-/* [i][j]: 2^(-j/3) * FRAC_ONE * 2^(i+2) / (2^(i+2) - 1) */
-static int32_t scale_factor_mult[15][3];
-/* mult table for layer 2 group quantization */
-
-#define SCALE_GEN(v) \
-{ FIXR(1.0 * (v)), FIXR(0.7937005259 * (v)), FIXR(0.6299605249 * (v)) }
-
-static int32_t scale_factor_mult2[3][3] = {
- SCALE_GEN(4.0 / 3.0), /* 3 steps */
- SCALE_GEN(4.0 / 5.0), /* 5 steps */
- SCALE_GEN(4.0 / 9.0), /* 9 steps */
-};
-
-/* 2^(n/4) */
-static uint32_t scale_factor_mult3[4] = {
- FIXR(1.0),
- FIXR(1.18920711500272106671),
- FIXR(1.41421356237309504880),
- FIXR(1.68179283050742908605),
-};
-
-static MPA_INT window[512] __attribute__((aligned(16)));
-
-/* layer 1 unscaling */
-/* n = number of bits of the mantissa minus 1 */
-static inline int l1_unscale(int n, int mant, int scale_factor)
-{
- int shift, mod;
- int64_t val;
-
- shift = scale_factor_modshift[scale_factor];
- mod = shift & 3;
- shift >>= 2;
- val = MUL64(mant + (-1 << n) + 1, scale_factor_mult[n-1][mod]);
- shift += n;
- /* NOTE: at this point, 1 <= shift >= 21 + 15 */
- return (int)((val + (1LL << (shift - 1))) >> shift);
-}
-
-static inline int l2_unscale_group(int steps, int mant, int scale_factor)
-{
- int shift, mod, val;
-
- shift = scale_factor_modshift[scale_factor];
- mod = shift & 3;
- shift >>= 2;
-
- val = (mant - (steps >> 1)) * scale_factor_mult2[steps >> 2][mod];
- /* NOTE: at this point, 0 <= shift <= 21 */
- if (shift > 0)
- val = (val + (1 << (shift - 1))) >> shift;
- return val;
-}
-
-/* compute value^(4/3) * 2^(exponent/4). It normalized to FRAC_BITS */
-static inline int l3_unscale(int value, int exponent)
-{
-#if FRAC_BITS <= 15
- unsigned int m;
-#else
- uint64_t m;
-#endif
- int e;
-
- e = table_4_3_exp[value];
- e += (exponent >> 2);
- e = FRAC_BITS - e;
-#if FRAC_BITS <= 15
- if (e > 31)
- e = 31;
-#endif
- m = table_4_3_value[value];
-#if FRAC_BITS <= 15
- m = (m * scale_factor_mult3[exponent & 3]);
- m = (m + (1 << (e-1))) >> e;
- return m;
-#else
- m = MUL64(m, scale_factor_mult3[exponent & 3]);
- m = (m + (uint64_t_C(1) << (e-1))) >> e;
- return m;
-#endif
-}
-
-/* all integer n^(4/3) computation code */
-#define DEV_ORDER 13
-
-#define POW_FRAC_BITS 24
-#define POW_FRAC_ONE (1 << POW_FRAC_BITS)
-#define POW_FIX(a) ((int)((a) * POW_FRAC_ONE))
-#define POW_MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> POW_FRAC_BITS)
-
-static int dev_4_3_coefs[DEV_ORDER];
-
-static int pow_mult3[3] = {
- POW_FIX(1.0),
- POW_FIX(1.25992104989487316476),
- POW_FIX(1.58740105196819947474),
-};
-
-static void int_pow_init(void)
-{
- int i, a;
-
- a = POW_FIX(1.0);
- for(i=0;i<DEV_ORDER;i++) {
- a = POW_MULL(a, POW_FIX(4.0 / 3.0) - i * POW_FIX(1.0)) / (i + 1);
- dev_4_3_coefs[i] = a;
- }
-}
-
-/* return the mantissa and the binary exponent */
-static int int_pow(int i, int *exp_ptr)
-{
- int e, er, eq, j;
- int a, a1;
-
- /* renormalize */
- a = i;
- e = POW_FRAC_BITS;
- while (a < (1 << (POW_FRAC_BITS - 1))) {
- a = a << 1;
- e--;
- }
- a -= (1 << POW_FRAC_BITS);
- a1 = 0;
- for(j = DEV_ORDER - 1; j >= 0; j--)
- a1 = POW_MULL(a, dev_4_3_coefs[j] + a1);
- a = (1 << POW_FRAC_BITS) + a1;
- /* exponent compute (exact) */
- e = e * 4;
- er = e % 3;
- eq = e / 3;
- a = POW_MULL(a, pow_mult3[er]);
- while (a >= 2 * POW_FRAC_ONE) {
- a = a >> 1;
- eq++;
- }
- /* convert to float */
- while (a < POW_FRAC_ONE) {
- a = a << 1;
- eq--;
- }
- /* now POW_FRAC_ONE <= a < 2 * POW_FRAC_ONE */
-#if POW_FRAC_BITS > FRAC_BITS
- a = (a + (1 << (POW_FRAC_BITS - FRAC_BITS - 1))) >> (POW_FRAC_BITS - FRAC_BITS);
- /* correct overflow */
- if (a >= 2 * (1 << FRAC_BITS)) {
- a = a >> 1;
- eq++;
- }
-#endif
- *exp_ptr = eq;
- return a;
-}
-
-static int decode_init(AVCodecContext * avctx)
-{
- MPADecodeContext *s = avctx->priv_data;
- static int init=0;
- int i, j, k;
-
- if (!init && !avctx->parse_only) {
- /* scale factors table for layer 1/2 */
- for(i=0;i<64;i++) {
- int shift, mod;
- /* 1.0 (i = 3) is normalized to 2 ^ FRAC_BITS */
- shift = (i / 3);
- mod = i % 3;
- scale_factor_modshift[i] = mod | (shift << 2);
- }
-
- /* scale factor multiply for layer 1 */
- for(i=0;i<15;i++) {
- int n, norm;
- n = i + 2;
- norm = ((int64_t_C(1) << n) * FRAC_ONE) / ((1 << n) - 1);
- scale_factor_mult[i][0] = MULL(FIXR(1.0 * 2.0), norm);
- scale_factor_mult[i][1] = MULL(FIXR(0.7937005259 * 2.0), norm);
- scale_factor_mult[i][2] = MULL(FIXR(0.6299605249 * 2.0), norm);
- dprintf("%d: norm=%x s=%x %x %x\n",
- i, norm,
- scale_factor_mult[i][0],
- scale_factor_mult[i][1],
- scale_factor_mult[i][2]);
- }
-
- /* window */
- /* max = 18760, max sum over all 16 coefs : 44736 */
- for(i=0;i<257;i++) {
- int v;
- v = mpa_enwindow[i];
-#if WFRAC_BITS < 16
- v = (v + (1 << (16 - WFRAC_BITS - 1))) >> (16 - WFRAC_BITS);
-#endif
- window[i] = v;
- if ((i & 63) != 0)
- v = -v;
- if (i != 0)
- window[512 - i] = v;
- }
-
- /* huffman decode tables */
- huff_code_table[0] = NULL;
- for(i=1;i<16;i++) {
- const HuffTable *h = &mpa_huff_tables[i];
- int xsize, x, y;
- unsigned int n;
- uint8_t *code_table;
-
- xsize = h->xsize;
- n = xsize * xsize;
- /* XXX: fail test */
- init_vlc(&huff_vlc[i], 8, n,
- h->bits, 1, 1, h->codes, 2, 2);
-
- code_table = av_mallocz(n);
- j = 0;
- for(x=0;x<xsize;x++) {
- for(y=0;y<xsize;y++)
- code_table[j++] = (x << 4) | y;
- }
- huff_code_table[i] = code_table;
- }
- for(i=0;i<2;i++) {
- init_vlc(&huff_quad_vlc[i], i == 0 ? 7 : 4, 16,
- mpa_quad_bits[i], 1, 1, mpa_quad_codes[i], 1, 1);
- }
-
- for(i=0;i<9;i++) {
- k = 0;
- for(j=0;j<22;j++) {
- band_index_long[i][j] = k;
- k += band_size_long[i][j];
- }
- band_index_long[i][22] = k;
- }
-
- /* compute n ^ (4/3) and store it in mantissa/exp format */
- if (!av_mallocz_static(&table_4_3_exp,
- TABLE_4_3_SIZE * sizeof(table_4_3_exp[0])))
- return -1;
- if (!av_mallocz_static(&table_4_3_value,
- TABLE_4_3_SIZE * sizeof(table_4_3_value[0])))
- return -1;
-
- int_pow_init();
- for(i=1;i<TABLE_4_3_SIZE;i++) {
- int e, m;
- m = int_pow(i, &e);
-#if 0
- /* test code */
- {
- double f, fm;
- int e1, m1;
- f = pow((double)i, 4.0 / 3.0);
- fm = frexp(f, &e1);
- m1 = FIXR(2 * fm);
-#if FRAC_BITS <= 15
- if ((unsigned short)m1 != m1) {
- m1 = m1 >> 1;
- e1++;
- }
-#endif
- e1--;
- if (m != m1 || e != e1) {
- printf("%4d: m=%x m1=%x e=%d e1=%d\n",
- i, m, m1, e, e1);
- }
- }
-#endif
- /* normalized to FRAC_BITS */
- table_4_3_value[i] = m;
- table_4_3_exp[i] = e;
- }
-
- for(i=0;i<7;i++) {
- float f;
- int v;
- if (i != 6) {
- f = tan((double)i * M_PI / 12.0);
- v = FIXR(f / (1.0 + f));
- } else {
- v = FIXR(1.0);
- }
- is_table[0][i] = v;
- is_table[1][6 - i] = v;
- }
- /* invalid values */
- for(i=7;i<16;i++)
- is_table[0][i] = is_table[1][i] = 0.0;
-
- for(i=0;i<16;i++) {
- double f;
- int e, k;
-
- for(j=0;j<2;j++) {
- e = -(j + 1) * ((i + 1) >> 1);
- f = pow(2.0, e / 4.0);
- k = i & 1;
- is_table_lsf[j][k ^ 1][i] = FIXR(f);
- is_table_lsf[j][k][i] = FIXR(1.0);
- dprintf("is_table_lsf %d %d: %x %x\n",
- i, j, is_table_lsf[j][0][i], is_table_lsf[j][1][i]);
- }
- }
-
- for(i=0;i<8;i++) {
- float ci, cs, ca;
- ci = ci_table[i];
- cs = 1.0 / sqrt(1.0 + ci * ci);
- ca = cs * ci;
- csa_table[i][0] = FIX(cs);
- csa_table[i][1] = FIX(ca);
- }
-
- /* compute mdct windows */
- for(i=0;i<36;i++) {
- int v;
- v = FIXR(sin(M_PI * (i + 0.5) / 36.0));
- mdct_win[0][i] = v;
- mdct_win[1][i] = v;
- mdct_win[3][i] = v;
- }
- for(i=0;i<6;i++) {
- mdct_win[1][18 + i] = FIXR(1.0);
- mdct_win[1][24 + i] = FIXR(sin(M_PI * ((i + 6) + 0.5) / 12.0));
- mdct_win[1][30 + i] = FIXR(0.0);
-
- mdct_win[3][i] = FIXR(0.0);
- mdct_win[3][6 + i] = FIXR(sin(M_PI * (i + 0.5) / 12.0));
- mdct_win[3][12 + i] = FIXR(1.0);
- }
-
- for(i=0;i<12;i++)
- mdct_win[2][i] = FIXR(sin(M_PI * (i + 0.5) / 12.0));
-
- /* NOTE: we do frequency inversion adter the MDCT by changing
- the sign of the right window coefs */
- for(j=0;j<4;j++) {
- for(i=0;i<36;i+=2) {
- mdct_win[j + 4][i] = mdct_win[j][i];
- mdct_win[j + 4][i + 1] = -mdct_win[j][i + 1];
- }
- }
-
-#if defined(DEBUG)
- for(j=0;j<8;j++) {
- printf("win%d=\n", j);
- for(i=0;i<36;i++)
- printf("%f, ", (double)mdct_win[j][i] / FRAC_ONE);
- printf("\n");
- }
-#endif
- init = 1;
- }
-
- s->inbuf_index = 0;
- s->inbuf = &s->inbuf1[s->inbuf_index][BACKSTEP_SIZE];
- s->inbuf_ptr = s->inbuf;
-#ifdef DEBUG
- s->frame_count = 0;
-#endif
- return 0;
-}
-
-/* tab[i][j] = 1.0 / (2.0 * cos(pi*(2*k+1) / 2^(6 - j))) */
-
-/* cos(i*pi/64) */
-
-#define COS0_0 FIXR(0.50060299823519630134)
-#define COS0_1 FIXR(0.50547095989754365998)
-#define COS0_2 FIXR(0.51544730992262454697)
-#define COS0_3 FIXR(0.53104259108978417447)
-#define COS0_4 FIXR(0.55310389603444452782)
-#define COS0_5 FIXR(0.58293496820613387367)
-#define COS0_6 FIXR(0.62250412303566481615)
-#define COS0_7 FIXR(0.67480834145500574602)
-#define COS0_8 FIXR(0.74453627100229844977)
-#define COS0_9 FIXR(0.83934964541552703873)
-#define COS0_10 FIXR(0.97256823786196069369)
-#define COS0_11 FIXR(1.16943993343288495515)
-#define COS0_12 FIXR(1.48416461631416627724)
-#define COS0_13 FIXR(2.05778100995341155085)
-#define COS0_14 FIXR(3.40760841846871878570)
-#define COS0_15 FIXR(10.19000812354805681150)
-
-#define COS1_0 FIXR(0.50241928618815570551)
-#define COS1_1 FIXR(0.52249861493968888062)
-#define COS1_2 FIXR(0.56694403481635770368)
-#define COS1_3 FIXR(0.64682178335999012954)
-#define COS1_4 FIXR(0.78815462345125022473)
-#define COS1_5 FIXR(1.06067768599034747134)
-#define COS1_6 FIXR(1.72244709823833392782)
-#define COS1_7 FIXR(5.10114861868916385802)
-
-#define COS2_0 FIXR(0.50979557910415916894)
-#define COS2_1 FIXR(0.60134488693504528054)
-#define COS2_2 FIXR(0.89997622313641570463)
-#define COS2_3 FIXR(2.56291544774150617881)
-
-#define COS3_0 FIXR(0.54119610014619698439)
-#define COS3_1 FIXR(1.30656296487637652785)
-
-#define COS4_0 FIXR(0.70710678118654752439)
-
-/* butterfly operator */
-#define BF(a, b, c)\
-{\
- tmp0 = tab[a] + tab[b];\
- tmp1 = tab[a] - tab[b];\
- tab[a] = tmp0;\
- tab[b] = MULL(tmp1, c);\
-}
-
-#define BF1(a, b, c, d)\
-{\
- BF(a, b, COS4_0);\
- BF(c, d, -COS4_0);\
- tab[c] += tab[d];\
-}
-
-#define BF2(a, b, c, d)\
-{\
- BF(a, b, COS4_0);\
- BF(c, d, -COS4_0);\
- tab[c] += tab[d];\
- tab[a] += tab[c];\
- tab[c] += tab[b];\
- tab[b] += tab[d];\
-}
-
-#define ADD(a, b) tab[a] += tab[b]
-
-/* DCT32 without 1/sqrt(2) coef zero scaling. */
-static void dct32(int32_t *out, int32_t *tab)
-{
- int tmp0, tmp1;
-
- /* pass 1 */
- BF(0, 31, COS0_0);
- BF(1, 30, COS0_1);
- BF(2, 29, COS0_2);
- BF(3, 28, COS0_3);
- BF(4, 27, COS0_4);
- BF(5, 26, COS0_5);
- BF(6, 25, COS0_6);
- BF(7, 24, COS0_7);
- BF(8, 23, COS0_8);
- BF(9, 22, COS0_9);
- BF(10, 21, COS0_10);
- BF(11, 20, COS0_11);
- BF(12, 19, COS0_12);
- BF(13, 18, COS0_13);
- BF(14, 17, COS0_14);
- BF(15, 16, COS0_15);
-
- /* pass 2 */
- BF(0, 15, COS1_0);
- BF(1, 14, COS1_1);
- BF(2, 13, COS1_2);
- BF(3, 12, COS1_3);
- BF(4, 11, COS1_4);
- BF(5, 10, COS1_5);
- BF(6, 9, COS1_6);
- BF(7, 8, COS1_7);
-
- BF(16, 31, -COS1_0);
- BF(17, 30, -COS1_1);
- BF(18, 29, -COS1_2);
- BF(19, 28, -COS1_3);
- BF(20, 27, -COS1_4);
- BF(21, 26, -COS1_5);
- BF(22, 25, -COS1_6);
- BF(23, 24, -COS1_7);
-
- /* pass 3 */
- BF(0, 7, COS2_0);
- BF(1, 6, COS2_1);
- BF(2, 5, COS2_2);
- BF(3, 4, COS2_3);
-
- BF(8, 15, -COS2_0);
- BF(9, 14, -COS2_1);
- BF(10, 13, -COS2_2);
- BF(11, 12, -COS2_3);
-
- BF(16, 23, COS2_0);
- BF(17, 22, COS2_1);
- BF(18, 21, COS2_2);
- BF(19, 20, COS2_3);
-
- BF(24, 31, -COS2_0);
- BF(25, 30, -COS2_1);
- BF(26, 29, -COS2_2);
- BF(27, 28, -COS2_3);
-
- /* pass 4 */
- BF(0, 3, COS3_0);
- BF(1, 2, COS3_1);
-
- BF(4, 7, -COS3_0);
- BF(5, 6, -COS3_1);
-
- BF(8, 11, COS3_0);
- BF(9, 10, COS3_1);
-
- BF(12, 15, -COS3_0);
- BF(13, 14, -COS3_1);
-
- BF(16, 19, COS3_0);
- BF(17, 18, COS3_1);
-
- BF(20, 23, -COS3_0);
- BF(21, 22, -COS3_1);
-
- BF(24, 27, COS3_0);
- BF(25, 26, COS3_1);
-
- BF(28, 31, -COS3_0);
- BF(29, 30, -COS3_1);
-
- /* pass 5 */
- BF1(0, 1, 2, 3);
- BF2(4, 5, 6, 7);
- BF1(8, 9, 10, 11);
- BF2(12, 13, 14, 15);
- BF1(16, 17, 18, 19);
- BF2(20, 21, 22, 23);
- BF1(24, 25, 26, 27);
- BF2(28, 29, 30, 31);
-
- /* pass 6 */
-
- ADD( 8, 12);
- ADD(12, 10);
- ADD(10, 14);
- ADD(14, 9);
- ADD( 9, 13);
- ADD(13, 11);
- ADD(11, 15);
-
- out[ 0] = tab[0];
- out[16] = tab[1];
- out[ 8] = tab[2];
- out[24] = tab[3];
- out[ 4] = tab[4];
- out[20] = tab[5];
- out[12] = tab[6];
- out[28] = tab[7];
- out[ 2] = tab[8];
- out[18] = tab[9];
- out[10] = tab[10];
- out[26] = tab[11];
- out[ 6] = tab[12];
- out[22] = tab[13];
- out[14] = tab[14];
- out[30] = tab[15];
-
- ADD(24, 28);
- ADD(28, 26);
- ADD(26, 30);
- ADD(30, 25);
- ADD(25, 29);
- ADD(29, 27);
- ADD(27, 31);
-
- out[ 1] = tab[16] + tab[24];
- out[17] = tab[17] + tab[25];
- out[ 9] = tab[18] + tab[26];
- out[25] = tab[19] + tab[27];
- out[ 5] = tab[20] + tab[28];
- out[21] = tab[21] + tab[29];
- out[13] = tab[22] + tab[30];
- out[29] = tab[23] + tab[31];
- out[ 3] = tab[24] + tab[20];
- out[19] = tab[25] + tab[21];
- out[11] = tab[26] + tab[22];
- out[27] = tab[27] + tab[23];
- out[ 7] = tab[28] + tab[18];
- out[23] = tab[29] + tab[19];
- out[15] = tab[30] + tab[17];
- out[31] = tab[31];
-}
-
-#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 15)
-
-#if FRAC_BITS <= 15
-
-static inline int round_sample(int sum)
-{
- int sum1;
- sum1 = (sum + (1 << (OUT_SHIFT - 1))) >> OUT_SHIFT;
- if (sum1 < -32768)
- sum1 = -32768;
- else if (sum1 > 32767)
- sum1 = 32767;
- return sum1;
-}
-
-#if defined(ARCH_POWERPC_405)
-
-/* signed 16x16 -> 32 multiply add accumulate */
-#define MACS(rt, ra, rb) \
- asm ("maclhw %0, %2, %3" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
-
-/* signed 16x16 -> 32 multiply */
-#define MULS(ra, rb) \
- ({ int __rt; asm ("mullhw %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb)); __rt; })
-
-#else
-
-/* signed 16x16 -> 32 multiply add accumulate */
-#define MACS(rt, ra, rb) rt += (ra) * (rb)
-
-/* signed 16x16 -> 32 multiply */
-#define MULS(ra, rb) ((ra) * (rb))
-
-#endif
-
-#else
-
-static inline int round_sample(int64_t sum)
-{
- int sum1;
- sum1 = (int)((sum + (int64_t_C(1) << (OUT_SHIFT - 1))) >> OUT_SHIFT);
- if (sum1 < -32768)
- sum1 = -32768;
- else if (sum1 > 32767)
- sum1 = 32767;
- return sum1;
-}
-
-#define MULS(ra, rb) MUL64(ra, rb)
-
-#endif
-
-#define SUM8(sum, op, w, p) \
-{ \
- sum op MULS((w)[0 * 64], p[0 * 64]);\
- sum op MULS((w)[1 * 64], p[1 * 64]);\
- sum op MULS((w)[2 * 64], p[2 * 64]);\
- sum op MULS((w)[3 * 64], p[3 * 64]);\
- sum op MULS((w)[4 * 64], p[4 * 64]);\
- sum op MULS((w)[5 * 64], p[5 * 64]);\
- sum op MULS((w)[6 * 64], p[6 * 64]);\
- sum op MULS((w)[7 * 64], p[7 * 64]);\
-}
-
-#define SUM8P2(sum1, op1, sum2, op2, w1, w2, p) \
-{ \
- int tmp;\
- tmp = p[0 * 64];\
- sum1 op1 MULS((w1)[0 * 64], tmp);\
- sum2 op2 MULS((w2)[0 * 64], tmp);\
- tmp = p[1 * 64];\
- sum1 op1 MULS((w1)[1 * 64], tmp);\
- sum2 op2 MULS((w2)[1 * 64], tmp);\
- tmp = p[2 * 64];\
- sum1 op1 MULS((w1)[2 * 64], tmp);\
- sum2 op2 MULS((w2)[2 * 64], tmp);\
- tmp = p[3 * 64];\
- sum1 op1 MULS((w1)[3 * 64], tmp);\
- sum2 op2 MULS((w2)[3 * 64], tmp);\
- tmp = p[4 * 64];\
- sum1 op1 MULS((w1)[4 * 64], tmp);\
- sum2 op2 MULS((w2)[4 * 64], tmp);\
- tmp = p[5 * 64];\
- sum1 op1 MULS((w1)[5 * 64], tmp);\
- sum2 op2 MULS((w2)[5 * 64], tmp);\
- tmp = p[6 * 64];\
- sum1 op1 MULS((w1)[6 * 64], tmp);\
- sum2 op2 MULS((w2)[6 * 64], tmp);\
- tmp = p[7 * 64];\
- sum1 op1 MULS((w1)[7 * 64], tmp);\
- sum2 op2 MULS((w2)[7 * 64], tmp);\
-}
-
-
-/* 32 sub band synthesis filter. Input: 32 sub band samples, Output:
- 32 samples. */
-/* XXX: optimize by avoiding ring buffer usage */
-static void synth_filter(MPADecodeContext *s1,
- int ch, int16_t *samples, int incr,
- int32_t sb_samples[SBLIMIT])
-{
- int32_t tmp[32];
- register MPA_INT *synth_buf;
- const register MPA_INT *w, *w2, *p;
- int j, offset, v;
- int16_t *samples2;
-#if FRAC_BITS <= 15
- int sum, sum2;
-#else
- int64_t sum, sum2;
-#endif
-
- dct32(tmp, sb_samples);
-
- offset = s1->synth_buf_offset[ch];
- synth_buf = s1->synth_buf[ch] + offset;
-
- for(j=0;j<32;j++) {
- v = tmp[j];
-#if FRAC_BITS <= 15
- /* NOTE: can cause a loss in precision if very high amplitude
- sound */
- if (v > 32767)
- v = 32767;
- else if (v < -32768)
- v = -32768;
-#endif
- synth_buf[j] = v;
- }
- /* copy to avoid wrap */
- memcpy(synth_buf + 512, synth_buf, 32 * sizeof(MPA_INT));
-
- samples2 = samples + 31 * incr;
- w = window;
- w2 = window + 31;
-
- sum = 0;
- p = synth_buf + 16;
- SUM8(sum, +=, w, p);
- p = synth_buf + 48;
- SUM8(sum, -=, w + 32, p);
- *samples = round_sample(sum);
- samples += incr;
- w++;
-
- /* we calculate two samples at the same time to avoid one memory
- access per two sample */
- for(j=1;j<16;j++) {
- sum = 0;
- sum2 = 0;
- p = synth_buf + 16 + j;
- SUM8P2(sum, +=, sum2, -=, w, w2, p);
- p = synth_buf + 48 - j;
- SUM8P2(sum, -=, sum2, -=, w + 32, w2 + 32, p);
-
- *samples = round_sample(sum);
- samples += incr;
- *samples2 = round_sample(sum2);
- samples2 -= incr;
- w++;
- w2--;
- }
-
- p = synth_buf + 32;
- sum = 0;
- SUM8(sum, -=, w + 32, p);
- *samples = round_sample(sum);
-
- offset = (offset - 32) & 511;
- s1->synth_buf_offset[ch] = offset;
-}
-
-/* cos(pi*i/24) */
-#define C1 FIXR(0.99144486137381041114)
-#define C3 FIXR(0.92387953251128675612)
-#define C5 FIXR(0.79335334029123516458)
-#define C7 FIXR(0.60876142900872063941)
-#define C9 FIXR(0.38268343236508977173)
-#define C11 FIXR(0.13052619222005159154)
-
-/* 12 points IMDCT. We compute it "by hand" by factorizing obvious
- cases. */
-static void imdct12(int *out, int *in)
-{
- int tmp;
- int64_t in1_3, in1_9, in4_3, in4_9;
-
- in1_3 = MUL64(in[1], C3);
- in1_9 = MUL64(in[1], C9);
- in4_3 = MUL64(in[4], C3);
- in4_9 = MUL64(in[4], C9);
-
- tmp = FRAC_RND(MUL64(in[0], C7) - in1_3 - MUL64(in[2], C11) +
- MUL64(in[3], C1) - in4_9 - MUL64(in[5], C5));
- out[0] = tmp;
- out[5] = -tmp;
- tmp = FRAC_RND(MUL64(in[0] - in[3], C9) - in1_3 +
- MUL64(in[2] + in[5], C3) - in4_9);
- out[1] = tmp;
- out[4] = -tmp;
- tmp = FRAC_RND(MUL64(in[0], C11) - in1_9 + MUL64(in[2], C7) -
- MUL64(in[3], C5) + in4_3 - MUL64(in[5], C1));
- out[2] = tmp;
- out[3] = -tmp;
- tmp = FRAC_RND(MUL64(-in[0], C5) + in1_9 + MUL64(in[2], C1) +
- MUL64(in[3], C11) - in4_3 - MUL64(in[5], C7));
- out[6] = tmp;
- out[11] = tmp;
- tmp = FRAC_RND(MUL64(-in[0] + in[3], C3) - in1_9 +
- MUL64(in[2] + in[5], C9) + in4_3);
- out[7] = tmp;
- out[10] = tmp;
- tmp = FRAC_RND(-MUL64(in[0], C1) - in1_3 - MUL64(in[2], C5) -
- MUL64(in[3], C7) - in4_9 - MUL64(in[5], C11));
- out[8] = tmp;
- out[9] = tmp;
-}
-
-#undef C1
-#undef C3
-#undef C5
-#undef C7
-#undef C9
-#undef C11
-
-/* cos(pi*i/18) */
-#define C1 FIXR(0.98480775301220805936)
-#define C2 FIXR(0.93969262078590838405)
-#define C3 FIXR(0.86602540378443864676)
-#define C4 FIXR(0.76604444311897803520)
-#define C5 FIXR(0.64278760968653932632)
-#define C6 FIXR(0.5)
-#define C7 FIXR(0.34202014332566873304)
-#define C8 FIXR(0.17364817766693034885)
-
-/* 0.5 / cos(pi*(2*i+1)/36) */
-static const int icos36[9] = {
- FIXR(0.50190991877167369479),
- FIXR(0.51763809020504152469),
- FIXR(0.55168895948124587824),
- FIXR(0.61038729438072803416),
- FIXR(0.70710678118654752439),
- FIXR(0.87172339781054900991),
- FIXR(1.18310079157624925896),
- FIXR(1.93185165257813657349),
- FIXR(5.73685662283492756461),
-};
-
-static const int icos72[18] = {
- /* 0.5 / cos(pi*(2*i+19)/72) */
- FIXR(0.74009361646113053152),
- FIXR(0.82133981585229078570),
- FIXR(0.93057949835178895673),
- FIXR(1.08284028510010010928),
- FIXR(1.30656296487637652785),
- FIXR(1.66275476171152078719),
- FIXR(2.31011315767264929558),
- FIXR(3.83064878777019433457),
- FIXR(11.46279281302667383546),
-
- /* 0.5 / cos(pi*(2*(i + 18) +19)/72) */
- FIXR(-0.67817085245462840086),
- FIXR(-0.63023620700513223342),
- FIXR(-0.59284452371708034528),
- FIXR(-0.56369097343317117734),
- FIXR(-0.54119610014619698439),
- FIXR(-0.52426456257040533932),
- FIXR(-0.51213975715725461845),
- FIXR(-0.50431448029007636036),
- FIXR(-0.50047634258165998492),
-};
-
-/* using Lee like decomposition followed by hand coded 9 points DCT */
-static void imdct36(int *out, int *in)
-{
- int i, j, t0, t1, t2, t3, s0, s1, s2, s3;
- int tmp[18], *tmp1, *in1;
- int64_t in3_3, in6_6;
-
- for(i=17;i>=1;i--)
- in[i] += in[i-1];
- for(i=17;i>=3;i-=2)
- in[i] += in[i-2];
-
- for(j=0;j<2;j++) {
- tmp1 = tmp + j;
- in1 = in + j;
-
- in3_3 = MUL64(in1[2*3], C3);
- in6_6 = MUL64(in1[2*6], C6);
-
- tmp1[0] = FRAC_RND(MUL64(in1[2*1], C1) + in3_3 +
- MUL64(in1[2*5], C5) + MUL64(in1[2*7], C7));
- tmp1[2] = in1[2*0] + FRAC_RND(MUL64(in1[2*2], C2) +
- MUL64(in1[2*4], C4) + in6_6 +
- MUL64(in1[2*8], C8));
- tmp1[4] = FRAC_RND(MUL64(in1[2*1] - in1[2*5] - in1[2*7], C3));
- tmp1[6] = FRAC_RND(MUL64(in1[2*2] - in1[2*4] - in1[2*8], C6)) -
- in1[2*6] + in1[2*0];
- tmp1[8] = FRAC_RND(MUL64(in1[2*1], C5) - in3_3 -
- MUL64(in1[2*5], C7) + MUL64(in1[2*7], C1));
- tmp1[10] = in1[2*0] + FRAC_RND(MUL64(-in1[2*2], C8) -
- MUL64(in1[2*4], C2) + in6_6 +
- MUL64(in1[2*8], C4));
- tmp1[12] = FRAC_RND(MUL64(in1[2*1], C7) - in3_3 +
- MUL64(in1[2*5], C1) -
- MUL64(in1[2*7], C5));
- tmp1[14] = in1[2*0] + FRAC_RND(MUL64(-in1[2*2], C4) +
- MUL64(in1[2*4], C8) + in6_6 -
- MUL64(in1[2*8], C2));
- tmp1[16] = in1[2*0] - in1[2*2] + in1[2*4] - in1[2*6] + in1[2*8];
- }
-
- i = 0;
- for(j=0;j<4;j++) {
- t0 = tmp[i];
- t1 = tmp[i + 2];
- s0 = t1 + t0;
- s2 = t1 - t0;
-
- t2 = tmp[i + 1];
- t3 = tmp[i + 3];
- s1 = MULL(t3 + t2, icos36[j]);
- s3 = MULL(t3 - t2, icos36[8 - j]);
-
- t0 = MULL(s0 + s1, icos72[9 + 8 - j]);
- t1 = MULL(s0 - s1, icos72[8 - j]);
- out[18 + 9 + j] = t0;
- out[18 + 8 - j] = t0;
- out[9 + j] = -t1;
- out[8 - j] = t1;
-
- t0 = MULL(s2 + s3, icos72[9+j]);
- t1 = MULL(s2 - s3, icos72[j]);
- out[18 + 9 + (8 - j)] = t0;
- out[18 + j] = t0;
- out[9 + (8 - j)] = -t1;
- out[j] = t1;
- i += 4;
- }
-
- s0 = tmp[16];
- s1 = MULL(tmp[17], icos36[4]);
- t0 = MULL(s0 + s1, icos72[9 + 4]);
- t1 = MULL(s0 - s1, icos72[4]);
- out[18 + 9 + 4] = t0;
- out[18 + 8 - 4] = t0;
- out[9 + 4] = -t1;
- out[8 - 4] = t1;
-}
-
-/* fast header check for resync */
-static int check_header(uint32_t header)
-{
- /* header */
- if ((header & 0xffe00000) != 0xffe00000)
- return -1;
- /* layer check */
- if (((header >> 17) & 3) == 0)
- return -1;
- /* bit rate */
- if (((header >> 12) & 0xf) == 0xf)
- return -1;
- /* frequency */
- if (((header >> 10) & 3) == 3)
- return -1;
- return 0;
-}
-
-/* header + layer + bitrate + freq + lsf/mpeg25 */
-#define SAME_HEADER_MASK \
- (0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19))
-
-/* header decoding. MUST check the header before because no
- consistency check is done there. Return 1 if free format found and
- that the frame size must be computed externally */
-static int decode_header(MPADecodeContext *s, uint32_t header)
-{
- int sample_rate, frame_size, mpeg25, padding;
- int sample_rate_index, bitrate_index;
- if (header & (1<<20)) {
- s->lsf = (header & (1<<19)) ? 0 : 1;
- mpeg25 = 0;
- } else {
- s->lsf = 1;
- mpeg25 = 1;
- }
-
- s->layer = 4 - ((header >> 17) & 3);
- /* extract frequency */
- sample_rate_index = (header >> 10) & 3;
- sample_rate = mpa_freq_tab[sample_rate_index] >> (s->lsf + mpeg25);
- sample_rate_index += 3 * (s->lsf + mpeg25);
- s->sample_rate_index = sample_rate_index;
- s->error_protection = ((header >> 16) & 1) ^ 1;
- s->sample_rate = sample_rate;
-
- bitrate_index = (header >> 12) & 0xf;
- padding = (header >> 9) & 1;
- //extension = (header >> 8) & 1;
- s->mode = (header >> 6) & 3;
- s->mode_ext = (header >> 4) & 3;
- //copyright = (header >> 3) & 1;
- //original = (header >> 2) & 1;
- //emphasis = header & 3;
-
- if (s->mode == MPA_MONO)
- s->nb_channels = 1;
- else
- s->nb_channels = 2;
-
- if (bitrate_index != 0) {
- frame_size = mpa_bitrate_tab[s->lsf][s->layer - 1][bitrate_index];
- s->bit_rate = frame_size * 1000;
- switch(s->layer) {
- case 1:
- frame_size = (frame_size * 12000) / sample_rate;
- frame_size = (frame_size + padding) * 4;
- break;
- case 2:
- frame_size = (frame_size * 144000) / sample_rate;
- frame_size += padding;
- break;
- default:
- case 3:
- frame_size = (frame_size * 144000) / (sample_rate << s->lsf);
- frame_size += padding;
- break;
- }
- s->frame_size = frame_size;
- } else {
- /* if no frame size computed, signal it */
- if (!s->free_format_frame_size)
- return 1;
- /* free format: compute bitrate and real frame size from the
- frame size we extracted by reading the bitstream */
- s->frame_size = s->free_format_frame_size;
- switch(s->layer) {
- case 1:
- s->frame_size += padding * 4;
- s->bit_rate = (s->frame_size * sample_rate) / 48000;
- break;
- case 2:
- s->frame_size += padding;
- s->bit_rate = (s->frame_size * sample_rate) / 144000;
- break;
- default:
- case 3:
- s->frame_size += padding;
- s->bit_rate = (s->frame_size * (sample_rate << s->lsf)) / 144000;
- break;
- }
- }
-
-#if defined(DEBUG)
- printf("layer%d, %d Hz, %d kbits/s, ",
- s->layer, s->sample_rate, s->bit_rate);
- if (s->nb_channels == 2) {
- if (s->layer == 3) {
- if (s->mode_ext & MODE_EXT_MS_STEREO)
- printf("ms-");
- if (s->mode_ext & MODE_EXT_I_STEREO)
- printf("i-");
- }
- printf("stereo");
- } else {
- printf("mono");
- }
- printf("\n");
-#endif
- return 0;
-}
-
-/* useful helper to get mpeg audio stream infos. Return -1 if error in
- header */
-int mp_decode_header(int *sample_rate_ptr,
- int *nb_channels_ptr,
- int *coded_frame_size_ptr,
- int *decoded_frame_size_ptr,
- uint32_t head)
-{
- MPADecodeContext s1, *s = &s1;
- int decoded_frame_size;
-
- if (check_header(head) != 0)
- return -1;
-
- if (decode_header(s, head) != 0) {
- return -1;
- }
-
- switch(s->layer) {
- case 1:
- decoded_frame_size = 384;
- break;
- case 2:
- decoded_frame_size = 1152;
- break;
- default:
- case 3:
- if (s->lsf)
- decoded_frame_size = 576;
- else
- decoded_frame_size = 1152;
- break;
- }
-
- *sample_rate_ptr = s->sample_rate;
- *nb_channels_ptr = s->nb_channels;
- *coded_frame_size_ptr = s->frame_size;
- *decoded_frame_size_ptr = decoded_frame_size * 2 * s->nb_channels;
- return 0;
-}
-
-/* return the number of decoded frames */
-static int mp_decode_layer1(MPADecodeContext *s)
-{
- int bound, i, v, n, ch, j, mant;
- uint8_t allocation[MPA_MAX_CHANNELS][SBLIMIT];
- uint8_t scale_factors[MPA_MAX_CHANNELS][SBLIMIT];
-
- if (s->mode == MPA_JSTEREO)
- bound = (s->mode_ext + 1) * 4;
- else
- bound = SBLIMIT;
-
- /* allocation bits */
- for(i=0;i<bound;i++) {
- for(ch=0;ch<s->nb_channels;ch++) {
- allocation[ch][i] = get_bits(&s->gb, 4);
- }
- }
- for(i=bound;i<SBLIMIT;i++) {
- allocation[0][i] = get_bits(&s->gb, 4);
- }
-
- /* scale factors */
- for(i=0;i<bound;i++) {
- for(ch=0;ch<s->nb_channels;ch++) {
- if (allocation[ch][i])
- scale_factors[ch][i] = get_bits(&s->gb, 6);
- }
- }
- for(i=bound;i<SBLIMIT;i++) {
- if (allocation[0][i]) {
- scale_factors[0][i] = get_bits(&s->gb, 6);
- scale_factors[1][i] = get_bits(&s->gb, 6);
- }
- }
-
- /* compute samples */
- for(j=0;j<12;j++) {
- for(i=0;i<bound;i++) {
- for(ch=0;ch<s->nb_channels;ch++) {
- n = allocation[ch][i];
- if (n) {
- mant = get_bits(&s->gb, n + 1);
- v = l1_unscale(n, mant, scale_factors[ch][i]);
- } else {
- v = 0;
- }
- s->sb_samples[ch][j][i] = v;
- }
- }
- for(i=bound;i<SBLIMIT;i++) {
- n = allocation[0][i];
- if (n) {
- mant = get_bits(&s->gb, n + 1);
- v = l1_unscale(n, mant, scale_factors[0][i]);
- s->sb_samples[0][j][i] = v;
- v = l1_unscale(n, mant, scale_factors[1][i]);
- s->sb_samples[1][j][i] = v;
- } else {
- s->sb_samples[0][j][i] = 0;
- s->sb_samples[1][j][i] = 0;
- }
- }
- }
- return 12;
-}
-
-/* bitrate is in kb/s */
-int l2_select_table(int bitrate, int nb_channels, int freq, int lsf)
-{
- int ch_bitrate, table;
-
- ch_bitrate = bitrate / nb_channels;
- if (!lsf) {
- if ((freq == 48000 && ch_bitrate >= 56) ||
- (ch_bitrate >= 56 && ch_bitrate <= 80))
- table = 0;
- else if (freq != 48000 && ch_bitrate >= 96)
- table = 1;
- else if (freq != 32000 && ch_bitrate <= 48)
- table = 2;
- else
- table = 3;
- } else {
- table = 4;
- }
- return table;
-}
-
-static int mp_decode_layer2(MPADecodeContext *s)
-{
- int sblimit; /* number of used subbands */
- const unsigned char *alloc_table;
- int table, bit_alloc_bits, i, j, ch, bound, v;
- unsigned char bit_alloc[MPA_MAX_CHANNELS][SBLIMIT];
- unsigned char scale_code[MPA_MAX_CHANNELS][SBLIMIT];
- unsigned char scale_factors[MPA_MAX_CHANNELS][SBLIMIT][3], *sf;
- int scale, qindex, bits, steps, k, l, m, b;
-
- /* select decoding table */
- table = l2_select_table(s->bit_rate / 1000, s->nb_channels,
- s->sample_rate, s->lsf);
- sblimit = sblimit_table[table];
- alloc_table = alloc_tables[table];
-
- if (s->mode == MPA_JSTEREO)
- bound = (s->mode_ext + 1) * 4;
- else
- bound = sblimit;
-
- dprintf("bound=%d sblimit=%d\n", bound, sblimit);
- /* parse bit allocation */
- j = 0;
- for(i=0;i<bound;i++) {
- bit_alloc_bits = alloc_table[j];
- for(ch=0;ch<s->nb_channels;ch++) {
- bit_alloc[ch][i] = get_bits(&s->gb, bit_alloc_bits);
- }
- j += 1 << bit_alloc_bits;
- }
- for(i=bound;i<sblimit;i++) {
- bit_alloc_bits = alloc_table[j];
- v = get_bits(&s->gb, bit_alloc_bits);
- bit_alloc[0][i] = v;
- bit_alloc[1][i] = v;
- j += 1 << bit_alloc_bits;
- }
-
-#ifdef DEBUG
- {
- for(ch=0;ch<s->nb_channels;ch++) {
- for(i=0;i<sblimit;i++)
- printf(" %d", bit_alloc[ch][i]);
- printf("\n");
- }
- }
-#endif
-
- /* scale codes */
- for(i=0;i<sblimit;i++) {
- for(ch=0;ch<s->nb_channels;ch++) {
- if (bit_alloc[ch][i])
- scale_code[ch][i] = get_bits(&s->gb, 2);
- }
- }
-
- /* scale factors */
- for(i=0;i<sblimit;i++) {
- for(ch=0;ch<s->nb_channels;ch++) {
- if (bit_alloc[ch][i]) {
- sf = scale_factors[ch][i];
- switch(scale_code[ch][i]) {
- default:
- case 0:
- sf[0] = get_bits(&s->gb, 6);
- sf[1] = get_bits(&s->gb, 6);
- sf[2] = get_bits(&s->gb, 6);
- break;
- case 2:
- sf[0] = get_bits(&s->gb, 6);
- sf[1] = sf[0];
- sf[2] = sf[0];
- break;
- case 1:
- sf[0] = get_bits(&s->gb, 6);
- sf[2] = get_bits(&s->gb, 6);
- sf[1] = sf[0];
- break;
- case 3:
- sf[0] = get_bits(&s->gb, 6);
- sf[2] = get_bits(&s->gb, 6);
- sf[1] = sf[2];
- break;
- }
- }
- }
- }
-
-#ifdef DEBUG
- for(ch=0;ch<s->nb_channels;ch++) {
- for(i=0;i<sblimit;i++) {
- if (bit_alloc[ch][i]) {
- sf = scale_factors[ch][i];
- printf(" %d %d %d", sf[0], sf[1], sf[2]);
- } else {
- printf(" -");
- }
- }
- printf("\n");
- }
-#endif
-
- /* samples */
- for(k=0;k<3;k++) {
- for(l=0;l<12;l+=3) {
- j = 0;
- for(i=0;i<bound;i++) {
- bit_alloc_bits = alloc_table[j];
- for(ch=0;ch<s->nb_channels;ch++) {
- b = bit_alloc[ch][i];
- if (b) {
- scale = scale_factors[ch][i][k];
- qindex = alloc_table[j+b];
- bits = quant_bits[qindex];
- if (bits < 0) {
- /* 3 values at the same time */
- v = get_bits(&s->gb, -bits);
- steps = quant_steps[qindex];
- s->sb_samples[ch][k * 12 + l + 0][i] =
- l2_unscale_group(steps, v % steps, scale);
- v = v / steps;
- s->sb_samples[ch][k * 12 + l + 1][i] =
- l2_unscale_group(steps, v % steps, scale);
- v = v / steps;
- s->sb_samples[ch][k * 12 + l + 2][i] =
- l2_unscale_group(steps, v, scale);
- } else {
- for(m=0;m<3;m++) {
- v = get_bits(&s->gb, bits);
- v = l1_unscale(bits - 1, v, scale);
- s->sb_samples[ch][k * 12 + l + m][i] = v;
- }
- }
- } else {
- s->sb_samples[ch][k * 12 + l + 0][i] = 0;
- s->sb_samples[ch][k * 12 + l + 1][i] = 0;
- s->sb_samples[ch][k * 12 + l + 2][i] = 0;
- }
- }
- /* next subband in alloc table */
- j += 1 << bit_alloc_bits;
- }
- /* XXX: find a way to avoid this duplication of code */
- for(i=bound;i<sblimit;i++) {
- bit_alloc_bits = alloc_table[j];
- b = bit_alloc[0][i];
- if (b) {
- int mant, scale0, scale1;
- scale0 = scale_factors[0][i][k];
- scale1 = scale_factors[1][i][k];
- qindex = alloc_table[j+b];
- bits = quant_bits[qindex];
- if (bits < 0) {
- /* 3 values at the same time */
- v = get_bits(&s->gb, -bits);
- steps = quant_steps[qindex];
- mant = v % steps;
- v = v / steps;
- s->sb_samples[0][k * 12 + l + 0][i] =
- l2_unscale_group(steps, mant, scale0);
- s->sb_samples[1][k * 12 + l + 0][i] =
- l2_unscale_group(steps, mant, scale1);
- mant = v % steps;
- v = v / steps;
- s->sb_samples[0][k * 12 + l + 1][i] =
- l2_unscale_group(steps, mant, scale0);
- s->sb_samples[1][k * 12 + l + 1][i] =
- l2_unscale_group(steps, mant, scale1);
- s->sb_samples[0][k * 12 + l + 2][i] =
- l2_unscale_group(steps, v, scale0);
- s->sb_samples[1][k * 12 + l + 2][i] =
- l2_unscale_group(steps, v, scale1);
- } else {
- for(m=0;m<3;m++) {
- mant = get_bits(&s->gb, bits);
- s->sb_samples[0][k * 12 + l + m][i] =
- l1_unscale(bits - 1, mant, scale0);
- s->sb_samples[1][k * 12 + l + m][i] =
- l1_unscale(bits - 1, mant, scale1);
- }
- }
- } else {
- s->sb_samples[0][k * 12 + l + 0][i] = 0;
- s->sb_samples[0][k * 12 + l + 1][i] = 0;
- s->sb_samples[0][k * 12 + l + 2][i] = 0;
- s->sb_samples[1][k * 12 + l + 0][i] = 0;
- s->sb_samples[1][k * 12 + l + 1][i] = 0;
- s->sb_samples[1][k * 12 + l + 2][i] = 0;
- }
- /* next subband in alloc table */
- j += 1 << bit_alloc_bits;
- }
- /* fill remaining samples to zero */
- for(i=sblimit;i<SBLIMIT;i++) {
- for(ch=0;ch<s->nb_channels;ch++) {
- s->sb_samples[ch][k * 12 + l + 0][i] = 0;
- s->sb_samples[ch][k * 12 + l + 1][i] = 0;
- s->sb_samples[ch][k * 12 + l + 2][i] = 0;
- }
- }
- }
- }
- return 3 * 12;
-}
-
-/*
- * Seek back in the stream for backstep bytes (at most 511 bytes)
- */
-static void seek_to_maindata(MPADecodeContext *s, unsigned int backstep)
-{
- uint8_t *ptr;
-
- /* compute current position in stream */
- ptr = (uint8_t *)(s->gb.buffer + (get_bits_count(&s->gb)>>3));
-
- /* copy old data before current one */
- ptr -= backstep;
- memcpy(ptr, s->inbuf1[s->inbuf_index ^ 1] +
- BACKSTEP_SIZE + s->old_frame_size - backstep, backstep);
- /* init get bits again */
- init_get_bits(&s->gb, ptr, (s->frame_size + backstep)*8);
-
- /* prepare next buffer */
- s->inbuf_index ^= 1;
- s->inbuf = &s->inbuf1[s->inbuf_index][BACKSTEP_SIZE];
- s->old_frame_size = s->frame_size;
-}
-
-static inline void lsf_sf_expand(int *slen,
- int sf, int n1, int n2, int n3)
-{
- if (n3) {
- slen[3] = sf % n3;
- sf /= n3;
- } else {
- slen[3] = 0;
- }
- if (n2) {
- slen[2] = sf % n2;
- sf /= n2;
- } else {
- slen[2] = 0;
- }
- slen[1] = sf % n1;
- sf /= n1;
- slen[0] = sf;
-}
-
-static void exponents_from_scale_factors(MPADecodeContext *s,
- GranuleDef *g,
- int16_t *exponents)
-{
- const uint8_t *bstab, *pretab;
- int len, i, j, k, l, v0, shift, gain, gains[3];
- int16_t *exp_ptr;
-
- exp_ptr = exponents;
- gain = g->global_gain - 210;
- shift = g->scalefac_scale + 1;
-
- bstab = band_size_long[s->sample_rate_index];
- pretab = mpa_pretab[g->preflag];
- for(i=0;i<g->long_end;i++) {
- v0 = gain - ((g->scale_factors[i] + pretab[i]) << shift);
- len = bstab[i];
- for(j=len;j>0;j--)
- *exp_ptr++ = v0;
- }
-
- if (g->short_start < 13) {
- bstab = band_size_short[s->sample_rate_index];
- gains[0] = gain - (g->subblock_gain[0] << 3);
- gains[1] = gain - (g->subblock_gain[1] << 3);
- gains[2] = gain - (g->subblock_gain[2] << 3);
- k = g->long_end;
- for(i=g->short_start;i<13;i++) {
- len = bstab[i];
- for(l=0;l<3;l++) {
- v0 = gains[l] - (g->scale_factors[k++] << shift);
- for(j=len;j>0;j--)
- *exp_ptr++ = v0;
- }
- }
- }
-}
-
-/* handle n = 0 too */
-static inline int get_bitsz(GetBitContext *s, int n)
-{
- if (n == 0)
- return 0;
- else
- return get_bits(s, n);
-}
-
-static int huffman_decode(MPADecodeContext *s, GranuleDef *g,
- int16_t *exponents, int end_pos)
-{
- int s_index;
- int linbits, code, x, y, l, v, i, j, k, pos;
- GetBitContext last_gb;
- VLC *vlc;
- uint8_t *code_table;
-
- /* low frequencies (called big values) */
- s_index = 0;
- for(i=0;i<3;i++) {
- j = g->region_size[i];
- if (j == 0)
- continue;
- /* select vlc table */
- k = g->table_select[i];
- l = mpa_huff_data[k][0];
- linbits = mpa_huff_data[k][1];
- vlc = &huff_vlc[l];
- code_table = huff_code_table[l];
-
- /* read huffcode and compute each couple */
- for(;j>0;j--) {
- if (get_bits_count(&s->gb) >= end_pos)
- break;
- if (code_table) {
- code = get_vlc(&s->gb, vlc);
- if (code < 0)
- return -1;
- y = code_table[code];
- x = y >> 4;
- y = y & 0x0f;
- } else {
- x = 0;
- y = 0;
- }
- dprintf("region=%d n=%d x=%d y=%d exp=%d\n",
- i, g->region_size[i] - j, x, y, exponents[s_index]);
- if (x) {
- if (x == 15)
- x += get_bitsz(&s->gb, linbits);
- v = l3_unscale(x, exponents[s_index]);
- if (get_bits1(&s->gb))
- v = -v;
- } else {
- v = 0;
- }
- g->sb_hybrid[s_index++] = v;
- if (y) {
- if (y == 15)
- y += get_bitsz(&s->gb, linbits);
- v = l3_unscale(y, exponents[s_index]);
- if (get_bits1(&s->gb))
- v = -v;
- } else {
- v = 0;
- }
- g->sb_hybrid[s_index++] = v;
- }
- }
-
- /* high frequencies */
- vlc = &huff_quad_vlc[g->count1table_select];
- last_gb.buffer = NULL;
- while (s_index <= 572) {
- pos = get_bits_count(&s->gb);
- if (pos >= end_pos) {
- if (pos > end_pos && last_gb.buffer != NULL) {
- /* some encoders generate an incorrect size for this
- part. We must go back into the data */
- s_index -= 4;
- s->gb = last_gb;
- }
- break;
- }
- last_gb= s->gb;
-
- code = get_vlc(&s->gb, vlc);
- dprintf("t=%d code=%d\n", g->count1table_select, code);
- if (code < 0)
- return -1;
- for(i=0;i<4;i++) {
- if (code & (8 >> i)) {
- /* non zero value. Could use a hand coded function for
- 'one' value */
- v = l3_unscale(1, exponents[s_index]);
- if(get_bits1(&s->gb))
- v = -v;
- } else {
- v = 0;
- }
- g->sb_hybrid[s_index++] = v;
- }
- }
- while (s_index < 576)
- g->sb_hybrid[s_index++] = 0;
- return 0;
-}
-
-/* Reorder short blocks from bitstream order to interleaved order. It
- would be faster to do it in parsing, but the code would be far more
- complicated */
-static void reorder_block(MPADecodeContext *s, GranuleDef *g)
-{
- int i, j, k, len;
- int32_t *ptr, *dst, *ptr1;
- int32_t tmp[576];
-
- if (g->block_type != 2)
- return;
-
- if (g->switch_point) {
- if (s->sample_rate_index != 8) {
- ptr = g->sb_hybrid + 36;
- } else {
- ptr = g->sb_hybrid + 48;
- }
- } else {
- ptr = g->sb_hybrid;
- }
-
- for(i=g->short_start;i<13;i++) {
- len = band_size_short[s->sample_rate_index][i];
- ptr1 = ptr;
- for(k=0;k<3;k++) {
- dst = tmp + k;
- for(j=len;j>0;j--) {
- *dst = *ptr++;
- dst += 3;
- }
- }
- memcpy(ptr1, tmp, len * 3 * sizeof(int32_t));
- }
-}
-
-#define ISQRT2 FIXR(0.70710678118654752440)
-
-static void compute_stereo(MPADecodeContext *s,
- GranuleDef *g0, GranuleDef *g1)
-{
- int i, j, k, l;
- int32_t v1, v2;
- int sf_max, tmp0, tmp1, sf, len, non_zero_found;
- int32_t (*is_tab)[16];
- int32_t *tab0, *tab1;
- int non_zero_found_short[3];
-
- /* intensity stereo */
- if (s->mode_ext & MODE_EXT_I_STEREO) {
- if (!s->lsf) {
- is_tab = is_table;
- sf_max = 7;
- } else {
- is_tab = is_table_lsf[g1->scalefac_compress & 1];
- sf_max = 16;
- }
-
- tab0 = g0->sb_hybrid + 576;
- tab1 = g1->sb_hybrid + 576;
-
- non_zero_found_short[0] = 0;
- non_zero_found_short[1] = 0;
- non_zero_found_short[2] = 0;
- k = (13 - g1->short_start) * 3 + g1->long_end - 3;
- for(i = 12;i >= g1->short_start;i--) {
- /* for last band, use previous scale factor */
- if (i != 11)
- k -= 3;
- len = band_size_short[s->sample_rate_index][i];
- for(l=2;l>=0;l--) {
- tab0 -= len;
- tab1 -= len;
- if (!non_zero_found_short[l]) {
- /* test if non zero band. if so, stop doing i-stereo */
- for(j=0;j<len;j++) {
- if (tab1[j] != 0) {
- non_zero_found_short[l] = 1;
- goto found1;
- }
- }
- sf = g1->scale_factors[k + l];
- if (sf >= sf_max)
- goto found1;
-
- v1 = is_tab[0][sf];
- v2 = is_tab[1][sf];
- for(j=0;j<len;j++) {
- tmp0 = tab0[j];
- tab0[j] = MULL(tmp0, v1);
- tab1[j] = MULL(tmp0, v2);
- }
- } else {
- found1:
- if (s->mode_ext & MODE_EXT_MS_STEREO) {
- /* lower part of the spectrum : do ms stereo
- if enabled */
- for(j=0;j<len;j++) {
- tmp0 = tab0[j];
- tmp1 = tab1[j];
- tab0[j] = MULL(tmp0 + tmp1, ISQRT2);
- tab1[j] = MULL(tmp0 - tmp1, ISQRT2);
- }
- }
- }
- }
- }
-
- non_zero_found = non_zero_found_short[0] |
- non_zero_found_short[1] |
- non_zero_found_short[2];
-
- for(i = g1->long_end - 1;i >= 0;i--) {
- len = band_size_long[s->sample_rate_index][i];
- tab0 -= len;
- tab1 -= len;
- /* test if non zero band. if so, stop doing i-stereo */
- if (!non_zero_found) {
- for(j=0;j<len;j++) {
- if (tab1[j] != 0) {
- non_zero_found = 1;
- goto found2;
- }
- }
- /* for last band, use previous scale factor */
- k = (i == 21) ? 20 : i;
- sf = g1->scale_factors[k];
- if (sf >= sf_max)
- goto found2;
- v1 = is_tab[0][sf];
- v2 = is_tab[1][sf];
- for(j=0;j<len;j++) {
- tmp0 = tab0[j];
- tab0[j] = MULL(tmp0, v1);
- tab1[j] = MULL(tmp0, v2);
- }
- } else {
- found2:
- if (s->mode_ext & MODE_EXT_MS_STEREO) {
- /* lower part of the spectrum : do ms stereo
- if enabled */
- for(j=0;j<len;j++) {
- tmp0 = tab0[j];
- tmp1 = tab1[j];
- tab0[j] = MULL(tmp0 + tmp1, ISQRT2);
- tab1[j] = MULL(tmp0 - tmp1, ISQRT2);
- }
- }
- }
- }
- } else if (s->mode_ext & MODE_EXT_MS_STEREO) {
- /* ms stereo ONLY */
- /* NOTE: the 1/sqrt(2) normalization factor is included in the
- global gain */
- tab0 = g0->sb_hybrid;
- tab1 = g1->sb_hybrid;
- for(i=0;i<576;i++) {
- tmp0 = tab0[i];
- tmp1 = tab1[i];
- tab0[i] = tmp0 + tmp1;
- tab1[i] = tmp0 - tmp1;
- }
- }
-}
-
-static void compute_antialias(MPADecodeContext *s,
- GranuleDef *g)
-{
- int32_t *ptr, *p0, *p1, *csa;
- int n, tmp0, tmp1, i, j;
-
- /* we antialias only "long" bands */
- if (g->block_type == 2) {
- if (!g->switch_point)
- return;
- /* XXX: check this for 8000Hz case */
- n = 1;
- } else {
- n = SBLIMIT - 1;
- }
-
- ptr = g->sb_hybrid + 18;
- for(i = n;i > 0;i--) {
- p0 = ptr - 1;
- p1 = ptr;
- csa = &csa_table[0][0];
- for(j=0;j<8;j++) {
- tmp0 = *p0;
- tmp1 = *p1;
- *p0 = FRAC_RND(MUL64(tmp0, csa[0]) - MUL64(tmp1, csa[1]));
- *p1 = FRAC_RND(MUL64(tmp0, csa[1]) + MUL64(tmp1, csa[0]));
- p0--;
- p1++;
- csa += 2;
- }
- ptr += 18;
- }
-}
-
-static void compute_imdct(MPADecodeContext *s,
- GranuleDef *g,
- int32_t *sb_samples,
- int32_t *mdct_buf)
-{
- int32_t *ptr, *win, *win1, *buf, *buf2, *out_ptr, *ptr1;
- int32_t in[6];
- int32_t out[36];
- int32_t out2[12];
- int i, j, k, mdct_long_end, v, sblimit;
-
- /* find last non zero block */
- ptr = g->sb_hybrid + 576;
- ptr1 = g->sb_hybrid + 2 * 18;
- while (ptr >= ptr1) {
- ptr -= 6;
- v = ptr[0] | ptr[1] | ptr[2] | ptr[3] | ptr[4] | ptr[5];
- if (v != 0)
- break;
- }
- sblimit = ((ptr - g->sb_hybrid) / 18) + 1;
-
- if (g->block_type == 2) {
- /* XXX: check for 8000 Hz */
- if (g->switch_point)
- mdct_long_end = 2;
- else
- mdct_long_end = 0;
- } else {
- mdct_long_end = sblimit;
- }
-
- buf = mdct_buf;
- ptr = g->sb_hybrid;
- for(j=0;j<mdct_long_end;j++) {
- imdct36(out, ptr);
- /* apply window & overlap with previous buffer */
- out_ptr = sb_samples + j;
- /* select window */
- if (g->switch_point && j < 2)
- win1 = mdct_win[0];
- else
- win1 = mdct_win[g->block_type];
- /* select frequency inversion */
- win = win1 + ((4 * 36) & -(j & 1));
- for(i=0;i<18;i++) {
- *out_ptr = MULL(out[i], win[i]) + buf[i];
- buf[i] = MULL(out[i + 18], win[i + 18]);
- out_ptr += SBLIMIT;
- }
- ptr += 18;
- buf += 18;
- }
- for(j=mdct_long_end;j<sblimit;j++) {
- for(i=0;i<6;i++) {
- out[i] = 0;
- out[6 + i] = 0;
- out[30+i] = 0;
- }
- /* select frequency inversion */
- win = mdct_win[2] + ((4 * 36) & -(j & 1));
- buf2 = out + 6;
- for(k=0;k<3;k++) {
- /* reorder input for short mdct */
- ptr1 = ptr + k;
- for(i=0;i<6;i++) {
- in[i] = *ptr1;
- ptr1 += 3;
- }
- imdct12(out2, in);
- /* apply 12 point window and do small overlap */
- for(i=0;i<6;i++) {
- buf2[i] = MULL(out2[i], win[i]) + buf2[i];
- buf2[i + 6] = MULL(out2[i + 6], win[i + 6]);
- }
- buf2 += 6;
- }
- /* overlap */
- out_ptr = sb_samples + j;
- for(i=0;i<18;i++) {
- *out_ptr = out[i] + buf[i];
- buf[i] = out[i + 18];
- out_ptr += SBLIMIT;
- }
- ptr += 18;
- buf += 18;
- }
- /* zero bands */
- for(j=sblimit;j<SBLIMIT;j++) {
- /* overlap */
- out_ptr = sb_samples + j;
- for(i=0;i<18;i++) {
- *out_ptr = buf[i];
- buf[i] = 0;
- out_ptr += SBLIMIT;
- }
- buf += 18;
- }
-}
-
-#if defined(DEBUG)
-void sample_dump(int fnum, int32_t *tab, int n)
-{
- static FILE *files[16], *f;
- char buf[512];
- int i;
- int32_t v;
-
- f = files[fnum];
- if (!f) {
- sprintf(buf, "/tmp/out%d.%s.pcm",
- fnum,
-#ifdef USE_HIGHPRECISION
- "hp"
-#else
- "lp"
-#endif
- );
- f = fopen(buf, "w");
- if (!f)
- return;
- files[fnum] = f;
- }
-
- if (fnum == 0) {
- static int pos = 0;
- printf("pos=%d\n", pos);
- for(i=0;i<n;i++) {
- printf(" %0.4f", (double)tab[i] / FRAC_ONE);
- if ((i % 18) == 17)
- printf("\n");
- }
- pos += n;
- }
- for(i=0;i<n;i++) {
- /* normalize to 23 frac bits */
- v = tab[i] << (23 - FRAC_BITS);
- fwrite(&v, 1, sizeof(int32_t), f);
- }
-}
-#endif
-
-
-/* main layer3 decoding function */
-static int mp_decode_layer3(MPADecodeContext *s)
-{
- int nb_granules, main_data_begin, private_bits;
- int gr, ch, blocksplit_flag, i, j, k, n, bits_pos, bits_left;
- GranuleDef granules[2][2], *g;
- int16_t exponents[576];
-
- /* read side info */
- if (s->lsf) {
- main_data_begin = get_bits(&s->gb, 8);
- if (s->nb_channels == 2)
- private_bits = get_bits(&s->gb, 2);
- else
- private_bits = get_bits(&s->gb, 1);
- nb_granules = 1;
- } else {
- main_data_begin = get_bits(&s->gb, 9);
- if (s->nb_channels == 2)
- private_bits = get_bits(&s->gb, 3);
- else
- private_bits = get_bits(&s->gb, 5);
- nb_granules = 2;
- for(ch=0;ch<s->nb_channels;ch++) {
- granules[ch][0].scfsi = 0; /* all scale factors are transmitted */
- granules[ch][1].scfsi = get_bits(&s->gb, 4);
- }
- }
-
- for(gr=0;gr<nb_granules;gr++) {
- for(ch=0;ch<s->nb_channels;ch++) {
- dprintf("gr=%d ch=%d: side_info\n", gr, ch);
- g = &granules[ch][gr];
- g->part2_3_length = get_bits(&s->gb, 12);
- g->big_values = get_bits(&s->gb, 9);
- g->global_gain = get_bits(&s->gb, 8);
- /* if MS stereo only is selected, we precompute the
- 1/sqrt(2) renormalization factor */
- if ((s->mode_ext & (MODE_EXT_MS_STEREO | MODE_EXT_I_STEREO)) ==
- MODE_EXT_MS_STEREO)
- g->global_gain -= 2;
- if (s->lsf)
- g->scalefac_compress = get_bits(&s->gb, 9);
- else
- g->scalefac_compress = get_bits(&s->gb, 4);
- blocksplit_flag = get_bits(&s->gb, 1);
- if (blocksplit_flag) {
- g->block_type = get_bits(&s->gb, 2);
- if (g->block_type == 0)
- return -1;
- g->switch_point = get_bits(&s->gb, 1);
- for(i=0;i<2;i++)
- g->table_select[i] = get_bits(&s->gb, 5);
- for(i=0;i<3;i++)
- g->subblock_gain[i] = get_bits(&s->gb, 3);
- /* compute huffman coded region sizes */
- if (g->block_type == 2)
- g->region_size[0] = (36 / 2);
- else {
- if (s->sample_rate_index <= 2)
- g->region_size[0] = (36 / 2);
- else if (s->sample_rate_index != 8)
- g->region_size[0] = (54 / 2);
- else
- g->region_size[0] = (108 / 2);
- }
- g->region_size[1] = (576 / 2);
- } else {
- int region_address1, region_address2, l;
- g->block_type = 0;
- g->switch_point = 0;
- for(i=0;i<3;i++)
- g->table_select[i] = get_bits(&s->gb, 5);
- /* compute huffman coded region sizes */
- region_address1 = get_bits(&s->gb, 4);
- region_address2 = get_bits(&s->gb, 3);
- dprintf("region1=%d region2=%d\n",
- region_address1, region_address2);
- g->region_size[0] =
- band_index_long[s->sample_rate_index][region_address1 + 1] >> 1;
- l = region_address1 + region_address2 + 2;
- /* should not overflow */
- if (l > 22)
- l = 22;
- g->region_size[1] =
- band_index_long[s->sample_rate_index][l] >> 1;
- }
- /* convert region offsets to region sizes and truncate
- size to big_values */
- g->region_size[2] = (576 / 2);
- j = 0;
- for(i=0;i<3;i++) {
- k = g->region_size[i];
- if (k > g->big_values)
- k = g->big_values;
- g->region_size[i] = k - j;
- j = k;
- }
-
- /* compute band indexes */
- if (g->block_type == 2) {
- if (g->switch_point) {
- /* if switched mode, we handle the 36 first samples as
- long blocks. For 8000Hz, we handle the 48 first
- exponents as long blocks (XXX: check this!) */
- if (s->sample_rate_index <= 2)
- g->long_end = 8;
- else if (s->sample_rate_index != 8)
- g->long_end = 6;
- else
- g->long_end = 4; /* 8000 Hz */
-
- if (s->sample_rate_index != 8)
- g->short_start = 3;
- else
- g->short_start = 2;
- } else {
- g->long_end = 0;
- g->short_start = 0;
- }
- } else {
- g->short_start = 13;
- g->long_end = 22;
- }
-
- g->preflag = 0;
- if (!s->lsf)
- g->preflag = get_bits(&s->gb, 1);
- g->scalefac_scale = get_bits(&s->gb, 1);
- g->count1table_select = get_bits(&s->gb, 1);
- dprintf("block_type=%d switch_point=%d\n",
- g->block_type, g->switch_point);
- }
- }
-
- /* now we get bits from the main_data_begin offset */
- dprintf("seekback: %d\n", main_data_begin);
- seek_to_maindata(s, main_data_begin);
-
- for(gr=0;gr<nb_granules;gr++) {
- for(ch=0;ch<s->nb_channels;ch++) {
- g = &granules[ch][gr];
-
- bits_pos = get_bits_count(&s->gb);
-
- if (!s->lsf) {
- uint8_t *sc;
- int slen, slen1, slen2;
-
- /* MPEG1 scale factors */
- slen1 = slen_table[0][g->scalefac_compress];
- slen2 = slen_table[1][g->scalefac_compress];
- dprintf("slen1=%d slen2=%d\n", slen1, slen2);
- if (g->block_type == 2) {
- n = g->switch_point ? 17 : 18;
- j = 0;
- for(i=0;i<n;i++)
- g->scale_factors[j++] = get_bitsz(&s->gb, slen1);
- for(i=0;i<18;i++)
- g->scale_factors[j++] = get_bitsz(&s->gb, slen2);
- for(i=0;i<3;i++)
- g->scale_factors[j++] = 0;
- } else {
- sc = granules[ch][0].scale_factors;
- j = 0;
- for(k=0;k<4;k++) {
- n = (k == 0 ? 6 : 5);
- if ((g->scfsi & (0x8 >> k)) == 0) {
- slen = (k < 2) ? slen1 : slen2;
- for(i=0;i<n;i++)
- g->scale_factors[j++] = get_bitsz(&s->gb, slen);
- } else {
- /* simply copy from last granule */
- for(i=0;i<n;i++) {
- g->scale_factors[j] = sc[j];
- j++;
- }
- }
- }
- g->scale_factors[j++] = 0;
- }
-#if defined(DEBUG)
- {
- printf("scfsi=%x gr=%d ch=%d scale_factors:\n",
- g->scfsi, gr, ch);
- for(i=0;i<j;i++)
- printf(" %d", g->scale_factors[i]);
- printf("\n");
- }
-#endif
- } else {
- int tindex, tindex2, slen[4], sl, sf;
-
- /* LSF scale factors */
- if (g->block_type == 2) {
- tindex = g->switch_point ? 2 : 1;
- } else {
- tindex = 0;
- }
- sf = g->scalefac_compress;
- if ((s->mode_ext & MODE_EXT_I_STEREO) && ch == 1) {
- /* intensity stereo case */
- sf >>= 1;
- if (sf < 180) {
- lsf_sf_expand(slen, sf, 6, 6, 0);
- tindex2 = 3;
- } else if (sf < 244) {
- lsf_sf_expand(slen, sf - 180, 4, 4, 0);
- tindex2 = 4;
- } else {
- lsf_sf_expand(slen, sf - 244, 3, 0, 0);
- tindex2 = 5;
- }
- } else {
- /* normal case */
- if (sf < 400) {
- lsf_sf_expand(slen, sf, 5, 4, 4);
- tindex2 = 0;
- } else if (sf < 500) {
- lsf_sf_expand(slen, sf - 400, 5, 4, 0);
- tindex2 = 1;
- } else {
- lsf_sf_expand(slen, sf - 500, 3, 0, 0);
- tindex2 = 2;
- g->preflag = 1;
- }
- }
-
- j = 0;
- for(k=0;k<4;k++) {
- n = lsf_nsf_table[tindex2][tindex][k];
- sl = slen[k];
- for(i=0;i<n;i++)
- g->scale_factors[j++] = get_bitsz(&s->gb, sl);
- }
- /* XXX: should compute exact size */
- for(;j<40;j++)
- g->scale_factors[j] = 0;
-#if defined(DEBUG)
- {
- printf("gr=%d ch=%d scale_factors:\n",
- gr, ch);
- for(i=0;i<40;i++)
- printf(" %d", g->scale_factors[i]);
- printf("\n");
- }
-#endif
- }
-
- exponents_from_scale_factors(s, g, exponents);
-
- /* read Huffman coded residue */
- if (huffman_decode(s, g, exponents,
- bits_pos + g->part2_3_length) < 0)
- return -1;
-#if defined(DEBUG)
- sample_dump(0, g->sb_hybrid, 576);
-#endif
-
- /* skip extension bits */
- bits_left = g->part2_3_length - (get_bits_count(&s->gb) - bits_pos);
- if (bits_left < 0) {
- dprintf("bits_left=%d\n", bits_left);
- return -1;
- }
- while (bits_left >= 16) {
- skip_bits(&s->gb, 16);
- bits_left -= 16;
- }
- if (bits_left > 0)
- skip_bits(&s->gb, bits_left);
- } /* ch */
-
- if (s->nb_channels == 2)
- compute_stereo(s, &granules[0][gr], &granules[1][gr]);
-
- for(ch=0;ch<s->nb_channels;ch++) {
- g = &granules[ch][gr];
-
- reorder_block(s, g);
-#if defined(DEBUG)
- sample_dump(0, g->sb_hybrid, 576);
-#endif
- compute_antialias(s, g);
-#if defined(DEBUG)
- sample_dump(1, g->sb_hybrid, 576);
-#endif
- compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
-#if defined(DEBUG)
- sample_dump(2, &s->sb_samples[ch][18 * gr][0], 576);
-#endif
- }
- } /* gr */
- return nb_granules * 18;
-}
-
-static int mp_decode_frame(MPADecodeContext *s,
- short *samples)
-{
- int i, nb_frames, ch;
- short *samples_ptr;
-
- init_get_bits(&s->gb, s->inbuf + HEADER_SIZE,
- (s->inbuf_ptr - s->inbuf - HEADER_SIZE)*8);
-
- /* skip error protection field */
- if (s->error_protection)
- get_bits(&s->gb, 16);
-
- dprintf("frame %d:\n", s->frame_count);
- switch(s->layer) {
- case 1:
- nb_frames = mp_decode_layer1(s);
- break;
- case 2:
- nb_frames = mp_decode_layer2(s);
- break;
- case 3:
- default:
- nb_frames = mp_decode_layer3(s);
- break;
- }
-#if defined(DEBUG)
- for(i=0;i<nb_frames;i++) {
- for(ch=0;ch<s->nb_channels;ch++) {
- int j;
- printf("%d-%d:", i, ch);
- for(j=0;j<SBLIMIT;j++)
- printf(" %0.6f", (double)s->sb_samples[ch][i][j] / FRAC_ONE);
- printf("\n");
- }
- }
-#endif
- /* apply the synthesis filter */
- for(ch=0;ch<s->nb_channels;ch++) {
- samples_ptr = samples + ch;
- for(i=0;i<nb_frames;i++) {
- synth_filter(s, ch, samples_ptr, s->nb_channels,
- s->sb_samples[ch][i]);
- samples_ptr += 32 * s->nb_channels;
- }
- }
-#ifdef DEBUG
- s->frame_count++;
-#endif
- return nb_frames * 32 * sizeof(short) * s->nb_channels;
-}
-
-static int decode_frame(AVCodecContext * avctx,
- void *data, int *data_size,
- uint8_t * buf, int buf_size)
-{
- MPADecodeContext *s = avctx->priv_data;
- uint32_t header;
- uint8_t *buf_ptr;
- int len, out_size;
- short *out_samples = data;
-
- *data_size = 0;
- buf_ptr = buf;
- while (buf_size > 0) {
- len = s->inbuf_ptr - s->inbuf;
- if (s->frame_size == 0) {
- /* special case for next header for first frame in free
- format case (XXX: find a simpler method) */
- if (s->free_format_next_header != 0) {
- s->inbuf[0] = s->free_format_next_header >> 24;
- s->inbuf[1] = s->free_format_next_header >> 16;
- s->inbuf[2] = s->free_format_next_header >> 8;
- s->inbuf[3] = s->free_format_next_header;
- s->inbuf_ptr = s->inbuf + 4;
- s->free_format_next_header = 0;
- goto got_header;
- }
- /* no header seen : find one. We need at least HEADER_SIZE
- bytes to parse it */
- len = HEADER_SIZE - len;
- if (len > buf_size)
- len = buf_size;
- if (len > 0) {
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- buf_size -= len;
- s->inbuf_ptr += len;
- }
- if ((s->inbuf_ptr - s->inbuf) >= HEADER_SIZE) {
- got_header:
- header = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
- (s->inbuf[2] << 8) | s->inbuf[3];
-
- if (check_header(header) < 0) {
- /* no sync found : move by one byte (inefficient, but simple!) */
- memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
- s->inbuf_ptr--;
- dprintf("skip %x\n", header);
- /* reset free format frame size to give a chance
- to get a new bitrate */
- s->free_format_frame_size = 0;
- } else {
- if (decode_header(s, header) == 1) {
- /* free format: prepare to compute frame size */
- s->frame_size = -1;
- }
- /* update codec info */
- avctx->sample_rate = s->sample_rate;
- avctx->channels = s->nb_channels;
- avctx->bit_rate = s->bit_rate;
- avctx->sub_id = s->layer;
- switch(s->layer) {
- case 1:
- avctx->frame_size = 384;
- break;
- case 2:
- avctx->frame_size = 1152;
- break;
- case 3:
- if (s->lsf)
- avctx->frame_size = 576;
- else
- avctx->frame_size = 1152;
- break;
- }
- }
- }
- } else if (s->frame_size == -1) {
- /* free format : find next sync to compute frame size */
- len = MPA_MAX_CODED_FRAME_SIZE - len;
- if (len > buf_size)
- len = buf_size;
- if (len == 0) {
- /* frame too long: resync */
- s->frame_size = 0;
- memmove(s->inbuf, s->inbuf + 1, s->inbuf_ptr - s->inbuf - 1);
- s->inbuf_ptr--;
- } else {
- uint8_t *p, *pend;
- uint32_t header1;
- int padding;
-
- memcpy(s->inbuf_ptr, buf_ptr, len);
- /* check for header */
- p = s->inbuf_ptr - 3;
- pend = s->inbuf_ptr + len - 4;
- while (p <= pend) {
- header = (p[0] << 24) | (p[1] << 16) |
- (p[2] << 8) | p[3];
- header1 = (s->inbuf[0] << 24) | (s->inbuf[1] << 16) |
- (s->inbuf[2] << 8) | s->inbuf[3];
- /* check with high probability that we have a
- valid header */
- if ((header & SAME_HEADER_MASK) ==
- (header1 & SAME_HEADER_MASK)) {
- /* header found: update pointers */
- len = (p + 4) - s->inbuf_ptr;
- buf_ptr += len;
- buf_size -= len;
- s->inbuf_ptr = p;
- /* compute frame size */
- s->free_format_next_header = header;
- s->free_format_frame_size = s->inbuf_ptr - s->inbuf;
- padding = (header1 >> 9) & 1;
- if (s->layer == 1)
- s->free_format_frame_size -= padding * 4;
- else
- s->free_format_frame_size -= padding;
- dprintf("free frame size=%d padding=%d\n",
- s->free_format_frame_size, padding);
- decode_header(s, header1);
- goto next_data;
- }
- p++;
- }
- /* not found: simply increase pointers */
- buf_ptr += len;
- s->inbuf_ptr += len;
- buf_size -= len;
- }
- } else if (len < s->frame_size) {
- if (s->frame_size > MPA_MAX_CODED_FRAME_SIZE)
- s->frame_size = MPA_MAX_CODED_FRAME_SIZE;
- len = s->frame_size - len;
- if (len > buf_size)
- len = buf_size;
- memcpy(s->inbuf_ptr, buf_ptr, len);
- buf_ptr += len;
- s->inbuf_ptr += len;
- buf_size -= len;
- }
- next_data:
- if (s->frame_size > 0 &&
- (s->inbuf_ptr - s->inbuf) >= s->frame_size) {
- if (avctx->parse_only) {
- /* simply return the frame data */
- *(uint8_t **)data = s->inbuf;
- out_size = s->inbuf_ptr - s->inbuf;
- } else {
- out_size = mp_decode_frame(s, out_samples);
- }
- s->inbuf_ptr = s->inbuf;
- s->frame_size = 0;
- *data_size = out_size;
- break;
- }
- }
- return buf_ptr - buf;
-}
-
-AVCodec mp2_decoder =
-{
- "mp2",
- CODEC_TYPE_AUDIO,
- CODEC_ID_MP2,
- sizeof(MPADecodeContext),
- decode_init,
- NULL,
- NULL,
- decode_frame,
- CODEC_CAP_PARSE_ONLY,
-};
-
-AVCodec mp3_decoder =
-{
- "mp3",
- CODEC_TYPE_AUDIO,
- CODEC_ID_MP3,
- sizeof(MPADecodeContext),
- decode_init,
- NULL,
- NULL,
- decode_frame,
- CODEC_CAP_PARSE_ONLY,
-};
projects / synfig.git / blobdiff