| /* |
| * MPEG Audio decoder |
| * Copyright (c) 2001, 2002 Fabrice Bellard |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * MPEG Audio decoder. |
| */ |
| |
| #include "libavutil/audioconvert.h" |
| #include "avcodec.h" |
| #include "get_bits.h" |
| #include "mathops.h" |
| #include "mpegaudiodsp.h" |
| |
| /* |
| * TODO: |
| * - test lsf / mpeg25 extensively. |
| */ |
| |
| #include "mpegaudio.h" |
| #include "mpegaudiodecheader.h" |
| |
| #define BACKSTEP_SIZE 512 |
| #define EXTRABYTES 24 |
| |
| /* 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]; |
| INTFLOAT sb_hybrid[SBLIMIT * 18]; /* 576 samples */ |
| } GranuleDef; |
| |
| typedef struct MPADecodeContext { |
| MPA_DECODE_HEADER |
| uint8_t last_buf[2*BACKSTEP_SIZE + EXTRABYTES]; |
| int last_buf_size; |
| /* next header (used in free format parsing) */ |
| uint32_t free_format_next_header; |
| GetBitContext gb; |
| GetBitContext in_gb; |
| DECLARE_ALIGNED(32, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512 * 2]; |
| int synth_buf_offset[MPA_MAX_CHANNELS]; |
| DECLARE_ALIGNED(32, INTFLOAT, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT]; |
| INTFLOAT mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */ |
| GranuleDef granules[2][2]; /* Used in Layer 3 */ |
| #ifdef DEBUG |
| int frame_count; |
| #endif |
| int adu_mode; ///< 0 for standard mp3, 1 for adu formatted mp3 |
| int dither_state; |
| int error_recognition; |
| AVCodecContext* avctx; |
| MPADSPContext mpadsp; |
| } MPADecodeContext; |
| |
| #if CONFIG_FLOAT |
| # define SHR(a,b) ((a)*(1.0f/(1<<(b)))) |
| # define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5)) |
| # define FIXR(x) ((float)(x)) |
| # define FIXHR(x) ((float)(x)) |
| # define MULH3(x, y, s) ((s)*(y)*(x)) |
| # define MULLx(x, y, s) ((y)*(x)) |
| # define RENAME(a) a ## _float |
| # define OUT_FMT AV_SAMPLE_FMT_FLT |
| #else |
| # define SHR(a,b) ((a)>>(b)) |
| /* WARNING: only correct for posititive numbers */ |
| # define FIXR_OLD(a) ((int)((a) * FRAC_ONE + 0.5)) |
| # define FIXR(a) ((int)((a) * FRAC_ONE + 0.5)) |
| # define FIXHR(a) ((int)((a) * (1LL<<32) + 0.5)) |
| # define MULH3(x, y, s) MULH((s)*(x), y) |
| # define MULLx(x, y, s) MULL(x,y,s) |
| # define RENAME(a) a ## _fixed |
| # define OUT_FMT AV_SAMPLE_FMT_S16 |
| #endif |
| |
| /****************/ |
| |
| #define HEADER_SIZE 4 |
| |
| #include "mpegaudiodata.h" |
| #include "mpegaudiodectab.h" |
| |
| /* vlc structure for decoding layer 3 huffman tables */ |
| static VLC huff_vlc[16]; |
| static VLC_TYPE huff_vlc_tables[ |
| 0+128+128+128+130+128+154+166+ |
| 142+204+190+170+542+460+662+414 |
| ][2]; |
| static const int huff_vlc_tables_sizes[16] = { |
| 0, 128, 128, 128, 130, 128, 154, 166, |
| 142, 204, 190, 170, 542, 460, 662, 414 |
| }; |
| static VLC huff_quad_vlc[2]; |
| static VLC_TYPE huff_quad_vlc_tables[128+16][2]; |
| static const int huff_quad_vlc_tables_sizes[2] = { |
| 128, 16 |
| }; |
| /* computed from band_size_long */ |
| static uint16_t band_index_long[9][23]; |
| #include "mpegaudio_tablegen.h" |
| /* intensity stereo coef table */ |
| static INTFLOAT is_table[2][16]; |
| static INTFLOAT is_table_lsf[2][2][16]; |
| static INTFLOAT csa_table[8][4]; |
| static INTFLOAT mdct_win[8][36]; |
| |
| static int16_t division_tab3[1<<6 ]; |
| static int16_t division_tab5[1<<8 ]; |
| static int16_t division_tab9[1<<11]; |
| |
| static int16_t * const division_tabs[4] = { |
| division_tab3, division_tab5, NULL, division_tab9 |
| }; |
| |
| /* 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_OLD(1.0 * (v)), FIXR_OLD(0.7937005259 * (v)), FIXR_OLD(0.6299605249 * (v)) } |
| |
| static const 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 */ |
| }; |
| |
| /** |
| * Convert region offsets to region sizes and truncate |
| * size to big_values. |
| */ |
| static void ff_region_offset2size(GranuleDef *g){ |
| int i, k, j=0; |
| g->region_size[2] = (576 / 2); |
| for(i=0;i<3;i++) { |
| k = FFMIN(g->region_size[i], g->big_values); |
| g->region_size[i] = k - j; |
| j = k; |
| } |
| } |
| |
| static void ff_init_short_region(MPADecodeContext *s, GranuleDef *g){ |
| 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); |
| } |
| |
| static void ff_init_long_region(MPADecodeContext *s, GranuleDef *g, int ra1, int ra2){ |
| int l; |
| g->region_size[0] = |
| band_index_long[s->sample_rate_index][ra1 + 1] >> 1; |
| /* should not overflow */ |
| l = FFMIN(ra1 + ra2 + 2, 22); |
| g->region_size[1] = |
| band_index_long[s->sample_rate_index][l] >> 1; |
| } |
| |
| static void ff_compute_band_indexes(MPADecodeContext *s, GranuleDef *g){ |
| 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 */ |
| |
| g->short_start = 2 + (s->sample_rate_index != 8); |
| } else { |
| g->long_end = 0; |
| g->short_start = 0; |
| } |
| } else { |
| g->short_start = 13; |
| g->long_end = 22; |
| } |
| } |
| |
| /* 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) |
| { |
| unsigned int m; |
| int e; |
| |
| e = table_4_3_exp [4*value + (exponent&3)]; |
| m = table_4_3_value[4*value + (exponent&3)]; |
| e -= (exponent >> 2); |
| assert(e>=1); |
| if (e > 31) |
| return 0; |
| m = (m + (1 << (e-1))) >> e; |
| |
| return m; |
| } |
| |
| static av_cold int decode_init(AVCodecContext * avctx) |
| { |
| MPADecodeContext *s = avctx->priv_data; |
| static int init=0; |
| int i, j, k; |
| |
| s->avctx = avctx; |
| |
| ff_mpadsp_init(&s->mpadsp); |
| |
| avctx->sample_fmt= OUT_FMT; |
| s->error_recognition= avctx->error_recognition; |
| |
| if (!init && !avctx->parse_only) { |
| int offset; |
| |
| /* 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_C(1) << n) * FRAC_ONE) / ((1 << n) - 1); |
| scale_factor_mult[i][0] = MULLx(norm, FIXR(1.0 * 2.0), FRAC_BITS); |
| scale_factor_mult[i][1] = MULLx(norm, FIXR(0.7937005259 * 2.0), FRAC_BITS); |
| scale_factor_mult[i][2] = MULLx(norm, FIXR(0.6299605249 * 2.0), FRAC_BITS); |
| av_dlog(avctx, "%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]); |
| } |
| |
| RENAME(ff_mpa_synth_init)(RENAME(ff_mpa_synth_window)); |
| |
| /* huffman decode tables */ |
| offset = 0; |
| for(i=1;i<16;i++) { |
| const HuffTable *h = &mpa_huff_tables[i]; |
| int xsize, x, y; |
| uint8_t tmp_bits [512]; |
| uint16_t tmp_codes[512]; |
| |
| memset(tmp_bits , 0, sizeof(tmp_bits )); |
| memset(tmp_codes, 0, sizeof(tmp_codes)); |
| |
| xsize = h->xsize; |
| |
| j = 0; |
| for(x=0;x<xsize;x++) { |
| for(y=0;y<xsize;y++){ |
| tmp_bits [(x << 5) | y | ((x&&y)<<4)]= h->bits [j ]; |
| tmp_codes[(x << 5) | y | ((x&&y)<<4)]= h->codes[j++]; |
| } |
| } |
| |
| /* XXX: fail test */ |
| huff_vlc[i].table = huff_vlc_tables+offset; |
| huff_vlc[i].table_allocated = huff_vlc_tables_sizes[i]; |
| init_vlc(&huff_vlc[i], 7, 512, |
| tmp_bits, 1, 1, tmp_codes, 2, 2, |
| INIT_VLC_USE_NEW_STATIC); |
| offset += huff_vlc_tables_sizes[i]; |
| } |
| assert(offset == FF_ARRAY_ELEMS(huff_vlc_tables)); |
| |
| offset = 0; |
| for(i=0;i<2;i++) { |
| huff_quad_vlc[i].table = huff_quad_vlc_tables+offset; |
| huff_quad_vlc[i].table_allocated = huff_quad_vlc_tables_sizes[i]; |
| init_vlc(&huff_quad_vlc[i], i == 0 ? 7 : 4, 16, |
| mpa_quad_bits[i], 1, 1, mpa_quad_codes[i], 1, 1, |
| INIT_VLC_USE_NEW_STATIC); |
| offset += huff_quad_vlc_tables_sizes[i]; |
| } |
| assert(offset == FF_ARRAY_ELEMS(huff_quad_vlc_tables)); |
| |
| 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 */ |
| |
| mpegaudio_tableinit(); |
| |
| for (i = 0; i < 4; i++) |
| if (ff_mpa_quant_bits[i] < 0) |
| for (j = 0; j < (1<<(-ff_mpa_quant_bits[i]+1)); j++) { |
| int val1, val2, val3, steps; |
| int val = j; |
| steps = ff_mpa_quant_steps[i]; |
| val1 = val % steps; |
| val /= steps; |
| val2 = val % steps; |
| val3 = val / steps; |
| division_tabs[i][j] = val1 + (val2 << 4) + (val3 << 8); |
| } |
| |
| |
| for(i=0;i<7;i++) { |
| float f; |
| INTFLOAT 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); |
| av_dlog(avctx, "is_table_lsf %d %d: %f %f\n", |
| i, j, (float) is_table_lsf[j][0][i], |
| (float) 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; |
| #if !CONFIG_FLOAT |
| csa_table[i][0] = FIXHR(cs/4); |
| csa_table[i][1] = FIXHR(ca/4); |
| csa_table[i][2] = FIXHR(ca/4) + FIXHR(cs/4); |
| csa_table[i][3] = FIXHR(ca/4) - FIXHR(cs/4); |
| #else |
| csa_table[i][0] = cs; |
| csa_table[i][1] = ca; |
| csa_table[i][2] = ca + cs; |
| csa_table[i][3] = ca - cs; |
| #endif |
| } |
| |
| /* compute mdct windows */ |
| for(i=0;i<36;i++) { |
| for(j=0; j<4; j++){ |
| double d; |
| |
| if(j==2 && i%3 != 1) |
| continue; |
| |
| d= sin(M_PI * (i + 0.5) / 36.0); |
| if(j==1){ |
| if (i>=30) d= 0; |
| else if(i>=24) d= sin(M_PI * (i - 18 + 0.5) / 12.0); |
| else if(i>=18) d= 1; |
| }else if(j==3){ |
| if (i< 6) d= 0; |
| else if(i< 12) d= sin(M_PI * (i - 6 + 0.5) / 12.0); |
| else if(i< 18) d= 1; |
| } |
| //merge last stage of imdct into the window coefficients |
| d*= 0.5 / cos(M_PI*(2*i + 19)/72); |
| |
| if(j==2) |
| mdct_win[j][i/3] = FIXHR((d / (1<<5))); |
| else |
| mdct_win[j][i ] = FIXHR((d / (1<<5))); |
| } |
| } |
| |
| /* 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]; |
| } |
| } |
| |
| init = 1; |
| } |
| |
| if (avctx->codec_id == CODEC_ID_MP3ADU) |
| s->adu_mode = 1; |
| return 0; |
| } |
| |
| #define C3 FIXHR(0.86602540378443864676/2) |
| |
| /* 0.5 / cos(pi*(2*i+1)/36) */ |
| static const INTFLOAT icos36[9] = { |
| FIXR(0.50190991877167369479), |
| FIXR(0.51763809020504152469), //0 |
| FIXR(0.55168895948124587824), |
| FIXR(0.61038729438072803416), |
| FIXR(0.70710678118654752439), //1 |
| FIXR(0.87172339781054900991), |
| FIXR(1.18310079157624925896), |
| FIXR(1.93185165257813657349), //2 |
| FIXR(5.73685662283492756461), |
| }; |
| |
| /* 0.5 / cos(pi*(2*i+1)/36) */ |
| static const INTFLOAT icos36h[9] = { |
| FIXHR(0.50190991877167369479/2), |
| FIXHR(0.51763809020504152469/2), //0 |
| FIXHR(0.55168895948124587824/2), |
| FIXHR(0.61038729438072803416/2), |
| FIXHR(0.70710678118654752439/2), //1 |
| FIXHR(0.87172339781054900991/2), |
| FIXHR(1.18310079157624925896/4), |
| FIXHR(1.93185165257813657349/4), //2 |
| // FIXHR(5.73685662283492756461), |
| }; |
| |
| /* 12 points IMDCT. We compute it "by hand" by factorizing obvious |
| cases. */ |
| static void imdct12(INTFLOAT *out, INTFLOAT *in) |
| { |
| INTFLOAT in0, in1, in2, in3, in4, in5, t1, t2; |
| |
| in0= in[0*3]; |
| in1= in[1*3] + in[0*3]; |
| in2= in[2*3] + in[1*3]; |
| in3= in[3*3] + in[2*3]; |
| in4= in[4*3] + in[3*3]; |
| in5= in[5*3] + in[4*3]; |
| in5 += in3; |
| in3 += in1; |
| |
| in2= MULH3(in2, C3, 2); |
| in3= MULH3(in3, C3, 4); |
| |
| t1 = in0 - in4; |
| t2 = MULH3(in1 - in5, icos36h[4], 2); |
| |
| out[ 7]= |
| out[10]= t1 + t2; |
| out[ 1]= |
| out[ 4]= t1 - t2; |
| |
| in0 += SHR(in4, 1); |
| in4 = in0 + in2; |
| in5 += 2*in1; |
| in1 = MULH3(in5 + in3, icos36h[1], 1); |
| out[ 8]= |
| out[ 9]= in4 + in1; |
| out[ 2]= |
| out[ 3]= in4 - in1; |
| |
| in0 -= in2; |
| in5 = MULH3(in5 - in3, icos36h[7], 2); |
| out[ 0]= |
| out[ 5]= in0 - in5; |
| out[ 6]= |
| out[11]= in0 + in5; |
| } |
| |
| /* cos(pi*i/18) */ |
| #define C1 FIXHR(0.98480775301220805936/2) |
| #define C2 FIXHR(0.93969262078590838405/2) |
| #define C3 FIXHR(0.86602540378443864676/2) |
| #define C4 FIXHR(0.76604444311897803520/2) |
| #define C5 FIXHR(0.64278760968653932632/2) |
| #define C6 FIXHR(0.5/2) |
| #define C7 FIXHR(0.34202014332566873304/2) |
| #define C8 FIXHR(0.17364817766693034885/2) |
| |
| |
| /* using Lee like decomposition followed by hand coded 9 points DCT */ |
| static void imdct36(INTFLOAT *out, INTFLOAT *buf, INTFLOAT *in, INTFLOAT *win) |
| { |
| int i, j; |
| INTFLOAT t0, t1, t2, t3, s0, s1, s2, s3; |
| INTFLOAT tmp[18], *tmp1, *in1; |
| |
| 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; |
| |
| t2 = in1[2*4] + in1[2*8] - in1[2*2]; |
| |
| t3 = in1[2*0] + SHR(in1[2*6],1); |
| t1 = in1[2*0] - in1[2*6]; |
| tmp1[ 6] = t1 - SHR(t2,1); |
| tmp1[16] = t1 + t2; |
| |
| t0 = MULH3(in1[2*2] + in1[2*4] , C2, 2); |
| t1 = MULH3(in1[2*4] - in1[2*8] , -2*C8, 1); |
| t2 = MULH3(in1[2*2] + in1[2*8] , -C4, 2); |
| |
| tmp1[10] = t3 - t0 - t2; |
| tmp1[ 2] = t3 + t0 + t1; |
| tmp1[14] = t3 + t2 - t1; |
| |
| tmp1[ 4] = MULH3(in1[2*5] + in1[2*7] - in1[2*1], -C3, 2); |
| t2 = MULH3(in1[2*1] + in1[2*5], C1, 2); |
| t3 = MULH3(in1[2*5] - in1[2*7], -2*C7, 1); |
| t0 = MULH3(in1[2*3], C3, 2); |
| |
| t1 = MULH3(in1[2*1] + in1[2*7], -C5, 2); |
| |
| tmp1[ 0] = t2 + t3 + t0; |
| tmp1[12] = t2 + t1 - t0; |
| tmp1[ 8] = t3 - t1 - t0; |
| } |
| |
| 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 = MULH3(t3 + t2, icos36h[j], 2); |
| s3 = MULLx(t3 - t2, icos36[8 - j], FRAC_BITS); |
| |
| t0 = s0 + s1; |
| t1 = s0 - s1; |
| out[(9 + j)*SBLIMIT] = MULH3(t1, win[9 + j], 1) + buf[9 + j]; |
| out[(8 - j)*SBLIMIT] = MULH3(t1, win[8 - j], 1) + buf[8 - j]; |
| buf[9 + j] = MULH3(t0, win[18 + 9 + j], 1); |
| buf[8 - j] = MULH3(t0, win[18 + 8 - j], 1); |
| |
| t0 = s2 + s3; |
| t1 = s2 - s3; |
| out[(9 + 8 - j)*SBLIMIT] = MULH3(t1, win[9 + 8 - j], 1) + buf[9 + 8 - j]; |
| out[( j)*SBLIMIT] = MULH3(t1, win[ j], 1) + buf[ j]; |
| buf[9 + 8 - j] = MULH3(t0, win[18 + 9 + 8 - j], 1); |
| buf[ + j] = MULH3(t0, win[18 + j], 1); |
| i += 4; |
| } |
| |
| s0 = tmp[16]; |
| s1 = MULH3(tmp[17], icos36h[4], 2); |
| t0 = s0 + s1; |
| t1 = s0 - s1; |
| out[(9 + 4)*SBLIMIT] = MULH3(t1, win[9 + 4], 1) + buf[9 + 4]; |
| out[(8 - 4)*SBLIMIT] = MULH3(t1, win[8 - 4], 1) + buf[8 - 4]; |
| buf[9 + 4] = MULH3(t0, win[18 + 9 + 4], 1); |
| buf[8 - 4] = MULH3(t0, win[18 + 8 - 4], 1); |
| } |
| |
| /* 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; |
| } |
| |
| 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 = ff_mpa_l2_select_table(s->bit_rate / 1000, s->nb_channels, |
| s->sample_rate, s->lsf); |
| sblimit = ff_mpa_sblimit_table[table]; |
| alloc_table = ff_mpa_alloc_tables[table]; |
| |
| if (s->mode == MPA_JSTEREO) |
| bound = (s->mode_ext + 1) * 4; |
| else |
| bound = sblimit; |
| |
| av_dlog(s->avctx, "bound=%d sblimit=%d\n", bound, sblimit); |
| |
| /* sanity check */ |
| if( bound > sblimit ) 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; |
| } |
| |
| /* 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; |
| } |
| } |
| } |
| } |
| |
| /* 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 = ff_mpa_quant_bits[qindex]; |
| if (bits < 0) { |
| int v2; |
| /* 3 values at the same time */ |
| v = get_bits(&s->gb, -bits); |
| v2 = division_tabs[qindex][v]; |
| steps = ff_mpa_quant_steps[qindex]; |
| |
| s->sb_samples[ch][k * 12 + l + 0][i] = |
| l2_unscale_group(steps, v2 & 15, scale); |
| s->sb_samples[ch][k * 12 + l + 1][i] = |
| l2_unscale_group(steps, (v2 >> 4) & 15, scale); |
| s->sb_samples[ch][k * 12 + l + 2][i] = |
| l2_unscale_group(steps, v2 >> 8 , 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 = ff_mpa_quant_bits[qindex]; |
| if (bits < 0) { |
| /* 3 values at the same time */ |
| v = get_bits(&s->gb, -bits); |
| steps = ff_mpa_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; |
| } |
| |
| #define SPLIT(dst,sf,n)\ |
| if(n==3){\ |
| int m= (sf*171)>>9;\ |
| dst= sf - 3*m;\ |
| sf=m;\ |
| }else if(n==4){\ |
| dst= sf&3;\ |
| sf>>=2;\ |
| }else if(n==5){\ |
| int m= (sf*205)>>10;\ |
| dst= sf - 5*m;\ |
| sf=m;\ |
| }else if(n==6){\ |
| int m= (sf*171)>>10;\ |
| dst= sf - 6*m;\ |
| sf=m;\ |
| }else{\ |
| dst=0;\ |
| } |
| |
| static av_always_inline void lsf_sf_expand(int *slen, |
| int sf, int n1, int n2, int n3) |
| { |
| SPLIT(slen[3], sf, n3) |
| SPLIT(slen[2], sf, n2) |
| SPLIT(slen[1], 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) + 400; |
| 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) + 400; |
| 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 void switch_buffer(MPADecodeContext *s, int *pos, int *end_pos, int *end_pos2){ |
| if(s->in_gb.buffer && *pos >= s->gb.size_in_bits){ |
| s->gb= s->in_gb; |
| s->in_gb.buffer=NULL; |
| assert((get_bits_count(&s->gb) & 7) == 0); |
| skip_bits_long(&s->gb, *pos - *end_pos); |
| *end_pos2= |
| *end_pos= *end_pos2 + get_bits_count(&s->gb) - *pos; |
| *pos= get_bits_count(&s->gb); |
| } |
| } |
| |
| /* Following is a optimized code for |
| INTFLOAT v = *src |
| if(get_bits1(&s->gb)) |
| v = -v; |
| *dst = v; |
| */ |
| #if CONFIG_FLOAT |
| #define READ_FLIP_SIGN(dst,src)\ |
| v = AV_RN32A(src) ^ (get_bits1(&s->gb)<<31);\ |
| AV_WN32A(dst, v); |
| #else |
| #define READ_FLIP_SIGN(dst,src)\ |
| v= -get_bits1(&s->gb);\ |
| *(dst) = (*(src) ^ v) - v; |
| #endif |
| |
| static int huffman_decode(MPADecodeContext *s, GranuleDef *g, |
| int16_t *exponents, int end_pos2) |
| { |
| int s_index; |
| int i; |
| int last_pos, bits_left; |
| VLC *vlc; |
| int end_pos= FFMIN(end_pos2, s->gb.size_in_bits); |
| |
| /* low frequencies (called big values) */ |
| s_index = 0; |
| for(i=0;i<3;i++) { |
| int j, k, l, linbits; |
| 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]; |
| |
| if(!l){ |
| memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*2*j); |
| s_index += 2*j; |
| continue; |
| } |
| |
| /* read huffcode and compute each couple */ |
| for(;j>0;j--) { |
| int exponent, x, y; |
| int v; |
| int pos= get_bits_count(&s->gb); |
| |
| if (pos >= end_pos){ |
| // av_log(NULL, AV_LOG_ERROR, "pos: %d %d %d %d\n", pos, end_pos, end_pos2, s_index); |
| switch_buffer(s, &pos, &end_pos, &end_pos2); |
| // av_log(NULL, AV_LOG_ERROR, "new pos: %d %d\n", pos, end_pos); |
| if(pos >= end_pos) |
| break; |
| } |
| y = get_vlc2(&s->gb, vlc->table, 7, 3); |
| |
| if(!y){ |
| g->sb_hybrid[s_index ] = |
| g->sb_hybrid[s_index+1] = 0; |
| s_index += 2; |
| continue; |
| } |
| |
| exponent= exponents[s_index]; |
| |
| av_dlog(s->avctx, "region=%d n=%d x=%d y=%d exp=%d\n", |
| i, g->region_size[i] - j, x, y, exponent); |
| if(y&16){ |
| x = y >> 5; |
| y = y & 0x0f; |
| if (x < 15){ |
| READ_FLIP_SIGN(g->sb_hybrid+s_index, RENAME(expval_table)[ exponent ]+x) |
| }else{ |
| x += get_bitsz(&s->gb, linbits); |
| v = l3_unscale(x, exponent); |
| if (get_bits1(&s->gb)) |
| v = -v; |
| g->sb_hybrid[s_index] = v; |
| } |
| if (y < 15){ |
| READ_FLIP_SIGN(g->sb_hybrid+s_index+1, RENAME(expval_table)[ exponent ]+y) |
| }else{ |
| y += get_bitsz(&s->gb, linbits); |
| v = l3_unscale(y, exponent); |
| if (get_bits1(&s->gb)) |
| v = -v; |
| g->sb_hybrid[s_index+1] = v; |
| } |
| }else{ |
| x = y >> 5; |
| y = y & 0x0f; |
| x += y; |
| if (x < 15){ |
| READ_FLIP_SIGN(g->sb_hybrid+s_index+!!y, RENAME(expval_table)[ exponent ]+x) |
| }else{ |
| x += get_bitsz(&s->gb, linbits); |
| v = l3_unscale(x, exponent); |
| if (get_bits1(&s->gb)) |
| v = -v; |
| g->sb_hybrid[s_index+!!y] = v; |
| } |
| g->sb_hybrid[s_index+ !y] = 0; |
| } |
| s_index+=2; |
| } |
| } |
| |
| /* high frequencies */ |
| vlc = &huff_quad_vlc[g->count1table_select]; |
| last_pos=0; |
| while (s_index <= 572) { |
| int pos, code; |
| pos = get_bits_count(&s->gb); |
| if (pos >= end_pos) { |
| if (pos > end_pos2 && last_pos){ |
| /* some encoders generate an incorrect size for this |
| part. We must go back into the data */ |
| s_index -= 4; |
| skip_bits_long(&s->gb, last_pos - pos); |
| av_log(s->avctx, AV_LOG_INFO, "overread, skip %d enddists: %d %d\n", last_pos - pos, end_pos-pos, end_pos2-pos); |
| if(s->error_recognition >= FF_ER_COMPLIANT) |
| s_index=0; |
| break; |
| } |
| // av_log(NULL, AV_LOG_ERROR, "pos2: %d %d %d %d\n", pos, end_pos, end_pos2, s_index); |
| switch_buffer(s, &pos, &end_pos, &end_pos2); |
| // av_log(NULL, AV_LOG_ERROR, "new pos2: %d %d %d\n", pos, end_pos, s_index); |
| if(pos >= end_pos) |
| break; |
| } |
| last_pos= pos; |
| |
| code = get_vlc2(&s->gb, vlc->table, vlc->bits, 1); |
| av_dlog(s->avctx, "t=%d code=%d\n", g->count1table_select, code); |
| g->sb_hybrid[s_index+0]= |
| g->sb_hybrid[s_index+1]= |
| g->sb_hybrid[s_index+2]= |
| g->sb_hybrid[s_index+3]= 0; |
| while(code){ |
| static const int idxtab[16]={3,3,2,2,1,1,1,1,0,0,0,0,0,0,0,0}; |
| int v; |
| int pos= s_index+idxtab[code]; |
| code ^= 8>>idxtab[code]; |
| READ_FLIP_SIGN(g->sb_hybrid+pos, RENAME(exp_table)+exponents[pos]) |
| } |
| s_index+=4; |
| } |
| /* skip extension bits */ |
| bits_left = end_pos2 - get_bits_count(&s->gb); |
| //av_log(NULL, AV_LOG_ERROR, "left:%d buf:%p\n", bits_left, s->in_gb.buffer); |
| if (bits_left < 0 && s->error_recognition >= FF_ER_COMPLIANT) { |
| av_log(s->avctx, AV_LOG_ERROR, "bits_left=%d\n", bits_left); |
| s_index=0; |
| }else if(bits_left > 0 && s->error_recognition >= FF_ER_AGGRESSIVE){ |
| av_log(s->avctx, AV_LOG_ERROR, "bits_left=%d\n", bits_left); |
| s_index=0; |
| } |
| memset(&g->sb_hybrid[s_index], 0, sizeof(*g->sb_hybrid)*(576 - s_index)); |
| skip_bits_long(&s->gb, bits_left); |
| |
| i= get_bits_count(&s->gb); |
| switch_buffer(s, &i, &end_pos, &end_pos2); |
| |
| 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, len; |
| INTFLOAT *ptr, *dst, *ptr1; |
| INTFLOAT 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; |
| dst = tmp; |
| for(j=len;j>0;j--) { |
| *dst++ = ptr[0*len]; |
| *dst++ = ptr[1*len]; |
| *dst++ = ptr[2*len]; |
| ptr++; |
| } |
| ptr+=2*len; |
| memcpy(ptr1, tmp, len * 3 * sizeof(*ptr1)); |
| } |
| } |
| |
| #define ISQRT2 FIXR(0.70710678118654752440) |
| |
| static void compute_stereo(MPADecodeContext *s, |
| GranuleDef *g0, GranuleDef *g1) |
| { |
| int i, j, k, l; |
| int sf_max, sf, len, non_zero_found; |
| INTFLOAT (*is_tab)[16], *tab0, *tab1, tmp0, tmp1, v1, v2; |
| 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] = MULLx(tmp0, v1, FRAC_BITS); |
| tab1[j] = MULLx(tmp0, v2, FRAC_BITS); |
| } |
| } 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] = MULLx(tmp0 + tmp1, ISQRT2, FRAC_BITS); |
| tab1[j] = MULLx(tmp0 - tmp1, ISQRT2, FRAC_BITS); |
| } |
| } |
| } |
| } |
| } |
| |
| 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] = MULLx(tmp0, v1, FRAC_BITS); |
| tab1[j] = MULLx(tmp0, v2, FRAC_BITS); |
| } |
| } 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] = MULLx(tmp0 + tmp1, ISQRT2, FRAC_BITS); |
| tab1[j] = MULLx(tmp0 - tmp1, ISQRT2, FRAC_BITS); |
| } |
| } |
| } |
| } |
| } 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; |
| } |
| } |
| } |
| |
| #if CONFIG_FLOAT |
| #define AA(j) do { \ |
| float tmp0 = ptr[-1-j]; \ |
| float tmp1 = ptr[ j]; \ |
| ptr[-1-j] = tmp0 * csa_table[j][0] - tmp1 * csa_table[j][1]; \ |
| ptr[ j] = tmp0 * csa_table[j][1] + tmp1 * csa_table[j][0]; \ |
| } while (0) |
| #else |
| #define AA(j) do { \ |
| int tmp0 = ptr[-1-j]; \ |
| int tmp1 = ptr[ j]; \ |
| int tmp2 = MULH(tmp0 + tmp1, csa_table[j][0]); \ |
| ptr[-1-j] = 4*(tmp2 - MULH(tmp1, csa_table[j][2])); \ |
| ptr[ j] = 4*(tmp2 + MULH(tmp0, csa_table[j][3])); \ |
| } while (0) |
| #endif |
| |
| static void compute_antialias(MPADecodeContext *s, GranuleDef *g) |
| { |
| INTFLOAT *ptr; |
| int n, i; |
| |
| /* 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--) { |
| AA(0); |
| AA(1); |
| AA(2); |
| AA(3); |
| AA(4); |
| AA(5); |
| AA(6); |
| AA(7); |
| |
| ptr += 18; |
| } |
| } |
| |
| static void compute_imdct(MPADecodeContext *s, |
| GranuleDef *g, |
| INTFLOAT *sb_samples, |
| INTFLOAT *mdct_buf) |
| { |
| INTFLOAT *win, *win1, *out_ptr, *ptr, *buf, *ptr1; |
| INTFLOAT out2[12]; |
| int i, j, mdct_long_end, sblimit; |
| |
| /* find last non zero block */ |
| ptr = g->sb_hybrid + 576; |
| ptr1 = g->sb_hybrid + 2 * 18; |
| while (ptr >= ptr1) { |
| int32_t *p; |
| ptr -= 6; |
| p= (int32_t*)ptr; |
| if(p[0] | p[1] | p[2] | p[3] | p[4] | p[5]) |
| 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++) { |
| /* 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)); |
| imdct36(out_ptr, buf, ptr, win); |
| out_ptr += 18*SBLIMIT; |
| ptr += 18; |
| buf += 18; |
| } |
| for(j=mdct_long_end;j<sblimit;j++) { |
| /* select frequency inversion */ |
| win = mdct_win[2] + ((4 * 36) & -(j & 1)); |
| out_ptr = sb_samples + j; |
| |
| for(i=0; i<6; i++){ |
| *out_ptr = buf[i]; |
| out_ptr += SBLIMIT; |
| } |
| imdct12(out2, ptr + 0); |
| for(i=0;i<6;i++) { |
| *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[i + 6*1]; |
| buf[i + 6*2] = MULH3(out2[i + 6], win[i + 6], 1); |
| out_ptr += SBLIMIT; |
| } |
| imdct12(out2, ptr + 1); |
| for(i=0;i<6;i++) { |
| *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[i + 6*2]; |
| buf[i + 6*0] = MULH3(out2[i + 6], win[i + 6], 1); |
| out_ptr += SBLIMIT; |
| } |
| imdct12(out2, ptr + 2); |
| for(i=0;i<6;i++) { |
| buf[i + 6*0] = MULH3(out2[i ], win[i ], 1) + buf[i + 6*0]; |
| buf[i + 6*1] = MULH3(out2[i + 6], win[i + 6], 1); |
| buf[i + 6*2] = 0; |
| } |
| 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; |
| } |
| } |
| |
| /* main layer3 decoding function */ |
| static int mp_decode_layer3(MPADecodeContext *s) |
| { |
| int nb_granules, main_data_begin; |
| int gr, ch, blocksplit_flag, i, j, k, n, bits_pos; |
| GranuleDef *g; |
| int16_t exponents[576]; //FIXME try INTFLOAT |
| |
| /* read side info */ |
| if (s->lsf) { |
| main_data_begin = get_bits(&s->gb, 8); |
| skip_bits(&s->gb, s->nb_channels); |
| nb_granules = 1; |
| } else { |
| main_data_begin = get_bits(&s->gb, 9); |
| if (s->nb_channels == 2) |
| skip_bits(&s->gb, 3); |
| else |
| skip_bits(&s->gb, 5); |
| nb_granules = 2; |
| for(ch=0;ch<s->nb_channels;ch++) { |
| s->granules[ch][0].scfsi = 0;/* all scale factors are transmitted */ |
| s->granules[ch][1].scfsi = get_bits(&s->gb, 4); |
| } |
| } |
| |
| for(gr=0;gr<nb_granules;gr++) { |
| for(ch=0;ch<s->nb_channels;ch++) { |
| av_dlog(s->avctx, "gr=%d ch=%d: side_info\n", gr, ch); |
| g = &s->granules[ch][gr]; |
| g->part2_3_length = get_bits(&s->gb, 12); |
| g->big_values = get_bits(&s->gb, 9); |
| if(g->big_values > 288){ |
| av_log(s->avctx, AV_LOG_ERROR, "big_values too big\n"); |
| return -1; |
| } |
| |
| 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_bits1(&s->gb); |
| if (blocksplit_flag) { |
| g->block_type = get_bits(&s->gb, 2); |
| if (g->block_type == 0){ |
| av_log(s->avctx, AV_LOG_ERROR, "invalid block type\n"); |
| return -1; |
| } |
| g->switch_point = get_bits1(&s->gb); |
| 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); |
| ff_init_short_region(s, g); |
| } else { |
| int region_address1, region_address2; |
| 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); |
| av_dlog(s->avctx, "region1=%d region2=%d\n", |
| region_address1, region_address2); |
| ff_init_long_region(s, g, region_address1, region_address2); |
| } |
| ff_region_offset2size(g); |
| ff_compute_band_indexes(s, g); |
| |
| g->preflag = 0; |
| if (!s->lsf) |
| g->preflag = get_bits1(&s->gb); |
| g->scalefac_scale = get_bits1(&s->gb); |
| g->count1table_select = get_bits1(&s->gb); |
| av_dlog(s->avctx, "block_type=%d switch_point=%d\n", |
| g->block_type, g->switch_point); |
| } |
| } |
| |
| if (!s->adu_mode) { |
| const uint8_t *ptr = s->gb.buffer + (get_bits_count(&s->gb)>>3); |
| assert((get_bits_count(&s->gb) & 7) == 0); |
| /* now we get bits from the main_data_begin offset */ |
| av_dlog(s->avctx, "seekback: %d\n", main_data_begin); |
| //av_log(NULL, AV_LOG_ERROR, "backstep:%d, lastbuf:%d\n", main_data_begin, s->last_buf_size); |
| |
| memcpy(s->last_buf + s->last_buf_size, ptr, EXTRABYTES); |
| s->in_gb= s->gb; |
| init_get_bits(&s->gb, s->last_buf, s->last_buf_size*8); |
| skip_bits_long(&s->gb, 8*(s->last_buf_size - main_data_begin)); |
| } |
| |
| for(gr=0;gr<nb_granules;gr++) { |
| for(ch=0;ch<s->nb_channels;ch++) { |
| g = &s->granules[ch][gr]; |
| if(get_bits_count(&s->gb)<0){ |
| av_log(s->avctx, AV_LOG_DEBUG, "mdb:%d, lastbuf:%d skipping granule %d\n", |
| main_data_begin, s->last_buf_size, gr); |
| skip_bits_long(&s->gb, g->part2_3_length); |
| memset(g->sb_hybrid, 0, sizeof(g->sb_hybrid)); |
| if(get_bits_count(&s->gb) >= s->gb.size_in_bits && s->in_gb.buffer){ |
| skip_bits_long(&s->in_gb, get_bits_count(&s->gb) - s->gb.size_in_bits); |
| s->gb= s->in_gb; |
| s->in_gb.buffer=NULL; |
| } |
| continue; |
| } |
| |
| 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]; |
| av_dlog(s->avctx, "slen1=%d slen2=%d\n", slen1, slen2); |
| if (g->block_type == 2) { |
| n = g->switch_point ? 17 : 18; |
| j = 0; |
| if(slen1){ |
| for(i=0;i<n;i++) |
| g->scale_factors[j++] = get_bits(&s->gb, slen1); |
| }else{ |
| for(i=0;i<n;i++) |
| g->scale_factors[j++] = 0; |
| } |
| if(slen2){ |
| for(i=0;i<18;i++) |
| g->scale_factors[j++] = get_bits(&s->gb, slen2); |
| for(i=0;i<3;i++) |
| g->scale_factors[j++] = 0; |
| }else{ |
| for(i=0;i<21;i++) |
| g->scale_factors[j++] = 0; |
| } |
| } else { |
| sc = s->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; |
| if(slen){ |
| for(i=0;i<n;i++) |
| g->scale_factors[j++] = get_bits(&s->gb, slen); |
| }else{ |
| for(i=0;i<n;i++) |
| g->scale_factors[j++] = 0; |
| } |
| } else { |
| /* simply copy from last granule */ |
| for(i=0;i<n;i++) { |
| g->scale_factors[j] = sc[j]; |
| j++; |
| } |
| } |
| } |
| g->scale_factors[j++] = 0; |
| } |
| } 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]; |
| if(sl){ |
| for(i=0;i<n;i++) |
| g->scale_factors[j++] = get_bits(&s->gb, sl); |
| }else{ |
| for(i=0;i<n;i++) |
| g->scale_factors[j++] = 0; |
| } |
| } |
| /* XXX: should compute exact size */ |
| for(;j<40;j++) |
| g->scale_factors[j] = 0; |
| } |
| |
| exponents_from_scale_factors(s, g, exponents); |
| |
| /* read Huffman coded residue */ |
| huffman_decode(s, g, exponents, bits_pos + g->part2_3_length); |
| } /* ch */ |
| |
| if (s->nb_channels == 2) |
| compute_stereo(s, &s->granules[0][gr], &s->granules[1][gr]); |
| |
| for(ch=0;ch<s->nb_channels;ch++) { |
| g = &s->granules[ch][gr]; |
| |
| reorder_block(s, g); |
| compute_antialias(s, g); |
| compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]); |
| } |
| } /* gr */ |
| if(get_bits_count(&s->gb)<0) |
| skip_bits_long(&s->gb, -get_bits_count(&s->gb)); |
| return nb_granules * 18; |
| } |
| |
| static int mp_decode_frame(MPADecodeContext *s, |
| OUT_INT *samples, const uint8_t *buf, int buf_size) |
| { |
| int i, nb_frames, ch; |
| OUT_INT *samples_ptr; |
| |
| init_get_bits(&s->gb, buf + HEADER_SIZE, (buf_size - HEADER_SIZE)*8); |
| |
| /* skip error protection field */ |
| if (s->error_protection) |
| skip_bits(&s->gb, 16); |
| |
| switch(s->layer) { |
| case 1: |
| s->avctx->frame_size = 384; |
| nb_frames = mp_decode_layer1(s); |
| break; |
| case 2: |
| s->avctx->frame_size = 1152; |
| nb_frames = mp_decode_layer2(s); |
| break; |
| case 3: |
| s->avctx->frame_size = s->lsf ? 576 : 1152; |
| default: |
| nb_frames = mp_decode_layer3(s); |
| |
| s->last_buf_size=0; |
| if(s->in_gb.buffer){ |
| align_get_bits(&s->gb); |
| i= get_bits_left(&s->gb)>>3; |
| if(i >= 0 && i <= BACKSTEP_SIZE){ |
| memmove(s->last_buf, s->gb.buffer + (get_bits_count(&s->gb)>>3), i); |
| s->last_buf_size=i; |
| }else |
| av_log(s->avctx, AV_LOG_ERROR, "invalid old backstep %d\n", i); |
| s->gb= s->in_gb; |
| s->in_gb.buffer= NULL; |
| } |
| |
| align_get_bits(&s->gb); |
| assert((get_bits_count(&s->gb) & 7) == 0); |
| i= get_bits_left(&s->gb)>>3; |
| |
| if(i<0 || i > BACKSTEP_SIZE || nb_frames<0){ |
| if(i<0) |
| av_log(s->avctx, AV_LOG_ERROR, "invalid new backstep %d\n", i); |
| i= FFMIN(BACKSTEP_SIZE, buf_size - HEADER_SIZE); |
| } |
| assert(i <= buf_size - HEADER_SIZE && i>= 0); |
| memcpy(s->last_buf + s->last_buf_size, s->gb.buffer + buf_size - HEADER_SIZE - i, i); |
| s->last_buf_size += i; |
| |
| break; |
| } |
| |
| /* apply the synthesis filter */ |
| for(ch=0;ch<s->nb_channels;ch++) { |
| samples_ptr = samples + ch; |
| for(i=0;i<nb_frames;i++) { |
| RENAME(ff_mpa_synth_filter)( |
| &s->mpadsp, |
| s->synth_buf[ch], &(s->synth_buf_offset[ch]), |
| RENAME(ff_mpa_synth_window), &s->dither_state, |
| samples_ptr, s->nb_channels, |
| s->sb_samples[ch][i]); |
| samples_ptr += 32 * s->nb_channels; |
| } |
| } |
| |
| return nb_frames * 32 * sizeof(OUT_INT) * s->nb_channels; |
| } |
| |
| static int decode_frame(AVCodecContext * avctx, |
| void *data, int *data_size, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| MPADecodeContext *s = avctx->priv_data; |
| uint32_t header; |
| int out_size; |
| OUT_INT *out_samples = data; |
| |
| if(buf_size < HEADER_SIZE) |
| return -1; |
| |
| header = AV_RB32(buf); |
| if(ff_mpa_check_header(header) < 0){ |
| av_log(avctx, AV_LOG_ERROR, "Header missing\n"); |
| return -1; |
| } |
| |
| if (ff_mpegaudio_decode_header((MPADecodeHeader *)s, header) == 1) { |
| /* free format: prepare to compute frame size */ |
| s->frame_size = -1; |
| return -1; |
| } |
| /* update codec info */ |
| avctx->channels = s->nb_channels; |
| avctx->channel_layout = s->nb_channels == 1 ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO; |
| if (!avctx->bit_rate) |
| avctx->bit_rate = s->bit_rate; |
| avctx->sub_id = s->layer; |
| |
| if (*data_size < avctx->frame_size * avctx->channels * sizeof(OUT_INT)) |
| return AVERROR(EINVAL); |
| *data_size = 0; |
| |
| if(s->frame_size<=0 || s->frame_size > buf_size){ |
| av_log(avctx, AV_LOG_ERROR, "incomplete frame\n"); |
| return -1; |
| }else if(s->frame_size < buf_size){ |
| av_log(avctx, AV_LOG_DEBUG, "incorrect frame size - multiple frames in buffer?\n"); |
| buf_size= s->frame_size; |
| } |
| |
| out_size = mp_decode_frame(s, out_samples, buf, buf_size); |
| if(out_size>=0){ |
| *data_size = out_size; |
| avctx->sample_rate = s->sample_rate; |
| //FIXME maybe move the other codec info stuff from above here too |
| }else |
| av_log(avctx, AV_LOG_DEBUG, "Error while decoding MPEG audio frame.\n"); //FIXME return -1 / but also return the number of bytes consumed |
| s->frame_size = 0; |
| return buf_size; |
| } |
| |
| static void flush(AVCodecContext *avctx){ |
| MPADecodeContext *s = avctx->priv_data; |
| memset(s->synth_buf, 0, sizeof(s->synth_buf)); |
| s->last_buf_size= 0; |
| } |
| |
| #if CONFIG_MP3ADU_DECODER || CONFIG_MP3ADUFLOAT_DECODER |
| static int decode_frame_adu(AVCodecContext * avctx, |
| void *data, int *data_size, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| MPADecodeContext *s = avctx->priv_data; |
| uint32_t header; |
| int len, out_size; |
| OUT_INT *out_samples = data; |
| |
| len = buf_size; |
| |
| // Discard too short frames |
| if (buf_size < HEADER_SIZE) { |
| *data_size = 0; |
| return buf_size; |
| } |
| |
| |
| if (len > MPA_MAX_CODED_FRAME_SIZE) |
| len = MPA_MAX_CODED_FRAME_SIZE; |
| |
| // Get header and restore sync word |
| header = AV_RB32(buf) | 0xffe00000; |
| |
| if (ff_mpa_check_header(header) < 0) { // Bad header, discard frame |
| *data_size = 0; |
| return buf_size; |
| } |
| |
| ff_mpegaudio_decode_header((MPADecodeHeader *)s, header); |
| /* update codec info */ |
| avctx->sample_rate = s->sample_rate; |
| avctx->channels = s->nb_channels; |
| if (!avctx->bit_rate) |
| avctx->bit_rate = s->bit_rate; |
| avctx->sub_id = s->layer; |
| |
| if (*data_size < avctx->frame_size * avctx->channels * sizeof(OUT_INT)) |
| return AVERROR(EINVAL); |
| |
| s->frame_size = len; |
| |
| if (avctx->parse_only) { |
| out_size = buf_size; |
| } else { |
| out_size = mp_decode_frame(s, out_samples, buf, buf_size); |
| } |
| |
| *data_size = out_size; |
| return buf_size; |
| } |
| #endif /* CONFIG_MP3ADU_DECODER || CONFIG_MP3ADUFLOAT_DECODER */ |
| |
| #if CONFIG_MP3ON4_DECODER || CONFIG_MP3ON4FLOAT_DECODER |
| |
| /** |
| * Context for MP3On4 decoder |
| */ |
| typedef struct MP3On4DecodeContext { |
| int frames; ///< number of mp3 frames per block (number of mp3 decoder instances) |
| int syncword; ///< syncword patch |
| const uint8_t *coff; ///< channels offsets in output buffer |
| MPADecodeContext *mp3decctx[5]; ///< MPADecodeContext for every decoder instance |
| } MP3On4DecodeContext; |
| |
| #include "mpeg4audio.h" |
| |
| /* Next 3 arrays are indexed by channel config number (passed via codecdata) */ |
| static const uint8_t mp3Frames[8] = {0,1,1,2,3,3,4,5}; /* number of mp3 decoder instances */ |
| /* offsets into output buffer, assume output order is FL FR BL BR C LFE */ |
| static const uint8_t chan_offset[8][5] = { |
| {0}, |
| {0}, // C |
| {0}, // FLR |
| {2,0}, // C FLR |
| {2,0,3}, // C FLR BS |
| {4,0,2}, // C FLR BLRS |
| {4,0,2,5}, // C FLR BLRS LFE |
| {4,0,2,6,5}, // C FLR BLRS BLR LFE |
| }; |
| |
| |
| static int decode_init_mp3on4(AVCodecContext * avctx) |
| { |
| MP3On4DecodeContext *s = avctx->priv_data; |
| MPEG4AudioConfig cfg; |
| int i; |
| |
| if ((avctx->extradata_size < 2) || (avctx->extradata == NULL)) { |
| av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n"); |
| return -1; |
| } |
| |
| ff_mpeg4audio_get_config(&cfg, avctx->extradata, avctx->extradata_size); |
| if (!cfg.chan_config || cfg.chan_config > 7) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid channel config number.\n"); |
| return -1; |
| } |
| s->frames = mp3Frames[cfg.chan_config]; |
| s->coff = chan_offset[cfg.chan_config]; |
| avctx->channels = ff_mpeg4audio_channels[cfg.chan_config]; |
| |
| if (cfg.sample_rate < 16000) |
| s->syncword = 0xffe00000; |
| else |
| s->syncword = 0xfff00000; |
| |
| /* Init the first mp3 decoder in standard way, so that all tables get builded |
| * We replace avctx->priv_data with the context of the first decoder so that |
| * decode_init() does not have to be changed. |
| * Other decoders will be initialized here copying data from the first context |
| */ |
| // Allocate zeroed memory for the first decoder context |
| s->mp3decctx[0] = av_mallocz(sizeof(MPADecodeContext)); |
| // Put decoder context in place to make init_decode() happy |
| avctx->priv_data = s->mp3decctx[0]; |
| decode_init(avctx); |
| // Restore mp3on4 context pointer |
| avctx->priv_data = s; |
| s->mp3decctx[0]->adu_mode = 1; // Set adu mode |
| |
| /* Create a separate codec/context for each frame (first is already ok). |
| * Each frame is 1 or 2 channels - up to 5 frames allowed |
| */ |
| for (i = 1; i < s->frames; i++) { |
| s->mp3decctx[i] = av_mallocz(sizeof(MPADecodeContext)); |
| s->mp3decctx[i]->adu_mode = 1; |
| s->mp3decctx[i]->avctx = avctx; |
| } |
| |
| return 0; |
| } |
| |
| |
| static av_cold int decode_close_mp3on4(AVCodecContext * avctx) |
| { |
| MP3On4DecodeContext *s = avctx->priv_data; |
| int i; |
| |
| for (i = 0; i < s->frames; i++) |
| av_free(s->mp3decctx[i]); |
| |
| return 0; |
| } |
| |
| |
| static int decode_frame_mp3on4(AVCodecContext * avctx, |
| void *data, int *data_size, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| MP3On4DecodeContext *s = avctx->priv_data; |
| MPADecodeContext *m; |
| int fsize, len = buf_size, out_size = 0; |
| uint32_t header; |
| OUT_INT *out_samples = data; |
| OUT_INT decoded_buf[MPA_FRAME_SIZE * MPA_MAX_CHANNELS]; |
| OUT_INT *outptr, *bp; |
| int fr, j, n; |
| |
| if(*data_size < MPA_FRAME_SIZE * MPA_MAX_CHANNELS * s->frames * sizeof(OUT_INT)) |
| return -1; |
| |
| *data_size = 0; |
| // Discard too short frames |
| if (buf_size < HEADER_SIZE) |
| return -1; |
| |
| // If only one decoder interleave is not needed |
| outptr = s->frames == 1 ? out_samples : decoded_buf; |
| |
| avctx->bit_rate = 0; |
| |
| for (fr = 0; fr < s->frames; fr++) { |
| fsize = AV_RB16(buf) >> 4; |
| fsize = FFMIN3(fsize, len, MPA_MAX_CODED_FRAME_SIZE); |
| m = s->mp3decctx[fr]; |
| assert (m != NULL); |
| |
| header = (AV_RB32(buf) & 0x000fffff) | s->syncword; // patch header |
| |
| if (ff_mpa_check_header(header) < 0) // Bad header, discard block |
| break; |
| |
| ff_mpegaudio_decode_header((MPADecodeHeader *)m, header); |
| out_size += mp_decode_frame(m, outptr, buf, fsize); |
| buf += fsize; |
| len -= fsize; |
| |
| if(s->frames > 1) { |
| n = m->avctx->frame_size*m->nb_channels; |
| /* interleave output data */ |
| bp = out_samples + s->coff[fr]; |
| if(m->nb_channels == 1) { |
| for(j = 0; j < n; j++) { |
| *bp = decoded_buf[j]; |
| bp += avctx->channels; |
| } |
| } else { |
| for(j = 0; j < n; j++) { |
| bp[0] = decoded_buf[j++]; |
| bp[1] = decoded_buf[j]; |
| bp += avctx->channels; |
| } |
| } |
| } |
| avctx->bit_rate += m->bit_rate; |
| } |
| |
| /* update codec info */ |
| avctx->sample_rate = s->mp3decctx[0]->sample_rate; |
| |
| *data_size = out_size; |
| return buf_size; |
| } |
| #endif /* CONFIG_MP3ON4_DECODER || CONFIG_MP3ON4FLOAT_DECODER */ |
| |
| #if !CONFIG_FLOAT |
| #if CONFIG_MP1_DECODER |
| AVCodec ff_mp1_decoder = |
| { |
| "mp1", |
| AVMEDIA_TYPE_AUDIO, |
| CODEC_ID_MP1, |
| sizeof(MPADecodeContext), |
| decode_init, |
| NULL, |
| NULL, |
| decode_frame, |
| CODEC_CAP_PARSE_ONLY, |
| .flush= flush, |
| .long_name= NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"), |
| }; |
| #endif |
| #if CONFIG_MP2_DECODER |
| AVCodec ff_mp2_decoder = |
| { |
| "mp2", |
| AVMEDIA_TYPE_AUDIO, |
| CODEC_ID_MP2, |
| sizeof(MPADecodeContext), |
| decode_init, |
| NULL, |
| NULL, |
| decode_frame, |
| CODEC_CAP_PARSE_ONLY, |
| .flush= flush, |
| .long_name= NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"), |
| }; |
| #endif |
| #if CONFIG_MP3_DECODER |
| AVCodec ff_mp3_decoder = |
| { |
| "mp3", |
| AVMEDIA_TYPE_AUDIO, |
| CODEC_ID_MP3, |
| sizeof(MPADecodeContext), |
| decode_init, |
| NULL, |
| NULL, |
| decode_frame, |
| CODEC_CAP_PARSE_ONLY, |
| .flush= flush, |
| .long_name= NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"), |
| }; |
| #endif |
| #if CONFIG_MP3ADU_DECODER |
| AVCodec ff_mp3adu_decoder = |
| { |
| "mp3adu", |
| AVMEDIA_TYPE_AUDIO, |
| CODEC_ID_MP3ADU, |
| sizeof(MPADecodeContext), |
| decode_init, |
| NULL, |
| NULL, |
| decode_frame_adu, |
| CODEC_CAP_PARSE_ONLY, |
| .flush= flush, |
| .long_name= NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"), |
| }; |
| #endif |
| #if CONFIG_MP3ON4_DECODER |
| AVCodec ff_mp3on4_decoder = |
| { |
| "mp3on4", |
| AVMEDIA_TYPE_AUDIO, |
| CODEC_ID_MP3ON4, |
| sizeof(MP3On4DecodeContext), |
| decode_init_mp3on4, |
| NULL, |
| decode_close_mp3on4, |
| decode_frame_mp3on4, |
| .flush= flush, |
| .long_name= NULL_IF_CONFIG_SMALL("MP3onMP4"), |
| }; |
| #endif |
| #endif |
