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- /*
- * 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/attributes.h"
- #include "libavutil/avassert.h"
- #include "libavutil/channel_layout.h"
- #include "libavutil/float_dsp.h"
- #include "libavutil/libm.h"
- #include "avcodec.h"
- #include "get_bits.h"
- #include "internal.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
- #define LAST_BUF_SIZE 2 * BACKSTEP_SIZE + EXTRABYTES
- /* 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];
- DECLARE_ALIGNED(16, INTFLOAT, sb_hybrid)[SBLIMIT * 18]; /* 576 samples */
- } GranuleDef;
- typedef struct MPADecodeContext {
- MPA_DECODE_HEADER
- uint8_t last_buf[LAST_BUF_SIZE];
- int last_buf_size;
- int extrasize;
- /* 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 */
- int adu_mode; ///< 0 for standard mp3, 1 for adu formatted mp3
- int dither_state;
- int err_recognition;
- AVCodecContext* avctx;
- MPADSPContext mpadsp;
- AVFloatDSPContext *fdsp;
- AVFrame *frame;
- } MPADecodeContext;
- #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 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 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 init_short_region(MPADecodeContext *s, GranuleDef *g)
- {
- if (g->block_type == 2) {
- if (s->sample_rate_index != 8)
- g->region_size[0] = (36 / 2);
- else
- g->region_size[0] = (72 / 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 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 compute_band_indexes(MPADecodeContext *s, GranuleDef *g)
- {
- if (g->block_type == 2) {
- if (g->switch_point) {
- if(s->sample_rate_index == 8)
- avpriv_request_sample(s->avctx, "switch point in 8khz");
- /* if switched mode, we handle the 36 first samples as
- long blocks. For 8000Hz, we handle the 72 first
- exponents as long blocks */
- if (s->sample_rate_index <= 2)
- g->long_end = 8;
- else
- g->long_end = 6;
- g->short_start = 3;
- } 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((int)(mant + (-1U << 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;
- #ifdef DEBUG
- if(e < 1)
- av_log(NULL, AV_LOG_WARNING, "l3_unscale: e is %d\n", e);
- #endif
- if (e > (SUINT)31)
- return 0;
- m = (m + ((1U << e)>>1)) >> e;
- return m;
- }
- static av_cold void decode_init_static(void)
- {
- int i, j, k;
- 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);
- ff_dlog(NULL, "%d: norm=%x s=%"PRIx32" %"PRIx32" %"PRIx32"\n", i,
- (unsigned)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] = { 0 };
- uint16_t tmp_codes[512] = { 0 };
- 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];
- }
- av_assert0(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];
- }
- av_assert0(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 = exp2(e / 4.0);
- k = i & 1;
- is_table_lsf[j][k ^ 1][i] = FIXR(f);
- is_table_lsf[j][k ][i] = FIXR(1.0);
- ff_dlog(NULL, "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++) {
- double ci, cs, ca;
- ci = ci_table[i];
- cs = 1.0 / sqrt(1.0 + ci * ci);
- ca = cs * ci;
- #if !USE_FLOATS
- 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
- }
- }
- #if USE_FLOATS
- static av_cold int decode_close(AVCodecContext * avctx)
- {
- MPADecodeContext *s = avctx->priv_data;
- av_freep(&s->fdsp);
- return 0;
- }
- #endif
- static av_cold int decode_init(AVCodecContext * avctx)
- {
- static int initialized_tables = 0;
- MPADecodeContext *s = avctx->priv_data;
- if (!initialized_tables) {
- decode_init_static();
- initialized_tables = 1;
- }
- s->avctx = avctx;
- #if USE_FLOATS
- s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
- if (!s->fdsp)
- return AVERROR(ENOMEM);
- #endif
- ff_mpadsp_init(&s->mpadsp);
- if (avctx->request_sample_fmt == OUT_FMT &&
- avctx->codec_id != AV_CODEC_ID_MP3ON4)
- avctx->sample_fmt = OUT_FMT;
- else
- avctx->sample_fmt = OUT_FMT_P;
- s->err_recognition = avctx->err_recognition;
- if (avctx->codec_id == AV_CODEC_ID_MP3ADU)
- s->adu_mode = 1;
- return 0;
- }
- #define C3 FIXHR(0.86602540378443864676/2)
- #define C4 FIXHR(0.70710678118654752439/2) //0.5 / cos(pi*(9)/36)
- #define C5 FIXHR(0.51763809020504152469/2) //0.5 / cos(pi*(5)/36)
- #define C6 FIXHR(1.93185165257813657349/4) //0.5 / cos(pi*(15)/36)
- /* 12 points IMDCT. We compute it "by hand" by factorizing obvious
- cases. */
- static void imdct12(INTFLOAT *out, SUINTFLOAT *in)
- {
- SUINTFLOAT 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, C4, 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, C5, 1);
- out[ 8] =
- out[ 9] = in4 + in1;
- out[ 2] =
- out[ 3] = in4 - in1;
- in0 -= in2;
- in5 = MULH3(in5 - in3, C6, 2);
- out[ 0] =
- out[ 5] = in0 - in5;
- out[ 6] =
- out[11] = in0 + in5;
- }
- /* 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;
- ff_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;
- }
- }
- }
- }
- 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->extrasize * 8) {
- s->gb = s->in_gb;
- s->in_gb.buffer = NULL;
- s->extrasize = 0;
- av_assert2((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 an optimized code for
- INTFLOAT v = *src
- if(get_bits1(&s->gb))
- v = -v;
- *dst = v;
- */
- #if USE_FLOATS
- #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 - s->extrasize * 8);
- /* 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){
- switch_buffer(s, &pos, &end_pos, &end_pos2);
- 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];
- ff_dlog(s->avctx, "region=%d n=%d y=%d exp=%d\n",
- i, g->region_size[i] - j, 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->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))
- s_index=0;
- break;
- }
- switch_buffer(s, &pos, &end_pos, &end_pos2);
- if (pos >= end_pos)
- break;
- }
- last_pos = pos;
- code = get_vlc2(&s->gb, vlc->table, vlc->bits, 1);
- ff_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);
- if (bits_left < 0 && (s->err_recognition & (AV_EF_BUFFER|AV_EF_COMPLIANT))) {
- av_log(s->avctx, AV_LOG_ERROR, "bits_left=%d\n", bits_left);
- s_index=0;
- } else if (bits_left > 0 && (s->err_recognition & (AV_EF_BUFFER|AV_EF_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 + 72;
- } 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, v1, v2;
- SUINTFLOAT tmp0, tmp1;
- 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 */
- #if USE_FLOATS
- s->fdsp->butterflies_float(g0->sb_hybrid, g1->sb_hybrid, 576);
- #else
- 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;
- }
- #endif
- }
- }
- #if USE_FLOATS
- #if HAVE_MIPSFPU
- # include "mips/compute_antialias_float.h"
- #endif /* HAVE_MIPSFPU */
- #else
- #if HAVE_MIPSDSP
- # include "mips/compute_antialias_fixed.h"
- #endif /* HAVE_MIPSDSP */
- #endif /* USE_FLOATS */
- #ifndef compute_antialias
- #if USE_FLOATS
- #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 { \
- SUINT tmp0 = ptr[-1-j]; \
- SUINT tmp1 = ptr[ j]; \
- SUINT 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;
- }
- }
- #endif /* compute_antialias */
- static void compute_imdct(MPADecodeContext *s, GranuleDef *g,
- INTFLOAT *sb_samples, INTFLOAT *mdct_buf)
- {
- INTFLOAT *win, *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;
- }
- s->mpadsp.RENAME(imdct36_blocks)(sb_samples, mdct_buf, g->sb_hybrid,
- mdct_long_end, g->switch_point,
- g->block_type);
- buf = mdct_buf + 4*18*(mdct_long_end >> 2) + (mdct_long_end & 3);
- ptr = g->sb_hybrid + 18 * mdct_long_end;
- for (j = mdct_long_end; j < sblimit; j++) {
- /* select frequency inversion */
- win = RENAME(ff_mdct_win)[2 + (4 & -(j & 1))];
- out_ptr = sb_samples + j;
- for (i = 0; i < 6; i++) {
- *out_ptr = buf[4*i];
- out_ptr += SBLIMIT;
- }
- imdct12(out2, ptr + 0);
- for (i = 0; i < 6; i++) {
- *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*1)];
- buf[4*(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[4*(i + 6*2)];
- buf[4*(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[4*(i + 6*0)] = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*0)];
- buf[4*(i + 6*1)] = MULH3(out2[i + 6], win[i + 6], 1);
- buf[4*(i + 6*2)] = 0;
- }
- ptr += 18;
- buf += (j&3) != 3 ? 1 : (4*18-3);
- }
- /* zero bands */
- for (j = sblimit; j < SBLIMIT; j++) {
- /* overlap */
- out_ptr = sb_samples + j;
- for (i = 0; i < 18; i++) {
- *out_ptr = buf[4*i];
- buf[4*i] = 0;
- out_ptr += SBLIMIT;
- }
- buf += (j&3) != 3 ? 1 : (4*18-3);
- }
- }
- /* 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++) {
- ff_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 AVERROR_INVALIDDATA;
- }
- 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 AVERROR_INVALIDDATA;
- }
- 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);
- 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);
- ff_dlog(s->avctx, "region1=%d region2=%d\n",
- region_address1, region_address2);
- init_long_region(s, g, region_address1, region_address2);
- }
- region_offset2size(g);
- 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);
- ff_dlog(s->avctx, "block_type=%d switch_point=%d\n",
- g->block_type, g->switch_point);
- }
- }
- if (!s->adu_mode) {
- int skip;
- const uint8_t *ptr = s->gb.buffer + (get_bits_count(&s->gb)>>3);
- s->extrasize = av_clip((get_bits_left(&s->gb) >> 3) - s->extrasize, 0,
- FFMAX(0, LAST_BUF_SIZE - s->last_buf_size));
- av_assert1((get_bits_count(&s->gb) & 7) == 0);
- /* now we get bits from the main_data_begin offset */
- ff_dlog(s->avctx, "seekback:%d, lastbuf:%d\n",
- main_data_begin, s->last_buf_size);
- memcpy(s->last_buf + s->last_buf_size, ptr, s->extrasize);
- s->in_gb = s->gb;
- init_get_bits(&s->gb, s->last_buf, (s->last_buf_size + s->extrasize) * 8);
- s->last_buf_size <<= 3;
- for (gr = 0; gr < nb_granules && (s->last_buf_size >> 3) < main_data_begin; gr++) {
- for (ch = 0; ch < s->nb_channels; ch++) {
- g = &s->granules[ch][gr];
- s->last_buf_size += g->part2_3_length;
- memset(g->sb_hybrid, 0, sizeof(g->sb_hybrid));
- compute_imdct(s, g, &s->sb_samples[ch][18 * gr][0], s->mdct_buf[ch]);
- }
- }
- skip = s->last_buf_size - 8 * main_data_begin;
- if (skip >= s->gb.size_in_bits - s->extrasize * 8 && s->in_gb.buffer) {
- skip_bits_long(&s->in_gb, skip - s->gb.size_in_bits + s->extrasize * 8);
- s->gb = s->in_gb;
- s->in_gb.buffer = NULL;
- s->extrasize = 0;
- } else {
- skip_bits_long(&s->gb, skip);
- }
- } else {
- gr = 0;
- s->extrasize = 0;
- }
- for (; gr < nb_granules; gr++) {
- for (ch = 0; ch < s->nb_channels; ch++) {
- g = &s->granules[ch][gr];
- bits_pos = get_bits_count(&s->gb);
- if (!s->lsf) {
- uint8_t *sc;
- int slen, slen1, slen2;
- /* MPEG-1 scale factors */
- slen1 = slen_table[0][g->scalefac_compress];
- slen2 = slen_table[1][g->scalefac_compress];
- ff_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->mode == MPA_JSTEREO)
- 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, ret;
- 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) - s->extrasize;
- 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;
- s->extrasize = 0;
- }
- align_get_bits(&s->gb);
- av_assert1((get_bits_count(&s->gb) & 7) == 0);
- i = (get_bits_left(&s->gb) >> 3) - s->extrasize;
- 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);
- }
- av_assert1(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;
- }
- if(nb_frames < 0)
- return nb_frames;
- /* get output buffer */
- if (!samples) {
- av_assert0(s->frame);
- s->frame->nb_samples = s->avctx->frame_size;
- if ((ret = ff_get_buffer(s->avctx, s->frame, 0)) < 0)
- return ret;
- samples = (OUT_INT **)s->frame->extended_data;
- }
- /* apply the synthesis filter */
- for (ch = 0; ch < s->nb_channels; ch++) {
- int sample_stride;
- if (s->avctx->sample_fmt == OUT_FMT_P) {
- samples_ptr = samples[ch];
- sample_stride = 1;
- } else {
- samples_ptr = samples[0] + ch;
- sample_stride = s->nb_channels;
- }
- 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,
- sample_stride, s->sb_samples[ch][i]);
- samples_ptr += 32 * sample_stride;
- }
- }
- return nb_frames * 32 * sizeof(OUT_INT) * s->nb_channels;
- }
- static int decode_frame(AVCodecContext * avctx, void *data, int *got_frame_ptr,
- AVPacket *avpkt)
- {
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- MPADecodeContext *s = avctx->priv_data;
- uint32_t header;
- int ret;
- int skipped = 0;
- while(buf_size && !*buf){
- buf++;
- buf_size--;
- skipped++;
- }
- if (buf_size < HEADER_SIZE)
- return AVERROR_INVALIDDATA;
- header = AV_RB32(buf);
- if (header>>8 == AV_RB32("TAG")>>8) {
- av_log(avctx, AV_LOG_DEBUG, "discarding ID3 tag\n");
- return buf_size + skipped;
- }
- ret = avpriv_mpegaudio_decode_header((MPADecodeHeader *)s, header);
- if (ret < 0) {
- av_log(avctx, AV_LOG_ERROR, "Header missing\n");
- return AVERROR_INVALIDDATA;
- } else if (ret == 1) {
- /* free format: prepare to compute frame size */
- s->frame_size = -1;
- return AVERROR_INVALIDDATA;
- }
- /* 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;
- if (s->frame_size <= 0) {
- av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
- return AVERROR_INVALIDDATA;
- } 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;
- }
- s->frame = data;
- ret = mp_decode_frame(s, NULL, buf, buf_size);
- if (ret >= 0) {
- s->frame->nb_samples = avctx->frame_size;
- *got_frame_ptr = 1;
- avctx->sample_rate = s->sample_rate;
- //FIXME maybe move the other codec info stuff from above here too
- } else {
- av_log(avctx, AV_LOG_ERROR, "Error while decoding MPEG audio frame.\n");
- /* Only return an error if the bad frame makes up the whole packet or
- * the error is related to buffer management.
- * If there is more data in the packet, just consume the bad frame
- * instead of returning an error, which would discard the whole
- * packet. */
- *got_frame_ptr = 0;
- if (buf_size == avpkt->size || ret != AVERROR_INVALIDDATA)
- return ret;
- }
- s->frame_size = 0;
- return buf_size + skipped;
- }
- static void mp_flush(MPADecodeContext *ctx)
- {
- memset(ctx->synth_buf, 0, sizeof(ctx->synth_buf));
- memset(ctx->mdct_buf, 0, sizeof(ctx->mdct_buf));
- ctx->last_buf_size = 0;
- ctx->dither_state = 0;
- }
- static void flush(AVCodecContext *avctx)
- {
- mp_flush(avctx->priv_data);
- }
- #if CONFIG_MP3ADU_DECODER || CONFIG_MP3ADUFLOAT_DECODER
- static int decode_frame_adu(AVCodecContext *avctx, void *data,
- int *got_frame_ptr, AVPacket *avpkt)
- {
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- MPADecodeContext *s = avctx->priv_data;
- uint32_t header;
- int len, ret;
- int av_unused out_size;
- len = buf_size;
- // Discard too short frames
- if (buf_size < HEADER_SIZE) {
- av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
- return AVERROR_INVALIDDATA;
- }
- if (len > MPA_MAX_CODED_FRAME_SIZE)
- len = MPA_MAX_CODED_FRAME_SIZE;
- // Get header and restore sync word
- header = AV_RB32(buf) | 0xffe00000;
- ret = avpriv_mpegaudio_decode_header((MPADecodeHeader *)s, header);
- if (ret < 0) {
- av_log(avctx, AV_LOG_ERROR, "Invalid frame header\n");
- return ret;
- }
- /* update codec info */
- avctx->sample_rate = s->sample_rate;
- 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;
- s->frame_size = len;
- s->frame = data;
- ret = mp_decode_frame(s, NULL, buf, buf_size);
- if (ret < 0) {
- av_log(avctx, AV_LOG_ERROR, "Error while decoding MPEG audio frame.\n");
- return ret;
- }
- *got_frame_ptr = 1;
- 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; ///< channel 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) */
- /* number of mp3 decoder instances */
- static const uint8_t mp3Frames[8] = { 0, 1, 1, 2, 3, 3, 4, 5 };
- /* offsets into output buffer, assume output order is FL FR C LFE BL BR SL SR */
- static const uint8_t chan_offset[8][5] = {
- { 0 },
- { 0 }, // C
- { 0 }, // FLR
- { 2, 0 }, // C FLR
- { 2, 0, 3 }, // C FLR BS
- { 2, 0, 3 }, // C FLR BLRS
- { 2, 0, 4, 3 }, // C FLR BLRS LFE
- { 2, 0, 6, 4, 3 }, // C FLR BLRS BLR LFE
- };
- /* mp3on4 channel layouts */
- static const int16_t chan_layout[8] = {
- 0,
- AV_CH_LAYOUT_MONO,
- AV_CH_LAYOUT_STEREO,
- AV_CH_LAYOUT_SURROUND,
- AV_CH_LAYOUT_4POINT0,
- AV_CH_LAYOUT_5POINT0,
- AV_CH_LAYOUT_5POINT1,
- AV_CH_LAYOUT_7POINT1
- };
- static av_cold int decode_close_mp3on4(AVCodecContext * avctx)
- {
- MP3On4DecodeContext *s = avctx->priv_data;
- int i;
- if (s->mp3decctx[0])
- av_freep(&s->mp3decctx[0]->fdsp);
- for (i = 0; i < s->frames; i++)
- av_freep(&s->mp3decctx[i]);
- return 0;
- }
- static av_cold int decode_init_mp3on4(AVCodecContext * avctx)
- {
- MP3On4DecodeContext *s = avctx->priv_data;
- MPEG4AudioConfig cfg;
- int i;
- if ((avctx->extradata_size < 2) || !avctx->extradata) {
- av_log(avctx, AV_LOG_ERROR, "Codec extradata missing or too short.\n");
- return AVERROR_INVALIDDATA;
- }
- avpriv_mpeg4audio_get_config(&cfg, avctx->extradata,
- avctx->extradata_size * 8, 1);
- if (!cfg.chan_config || cfg.chan_config > 7) {
- av_log(avctx, AV_LOG_ERROR, "Invalid channel config number.\n");
- return AVERROR_INVALIDDATA;
- }
- s->frames = mp3Frames[cfg.chan_config];
- s->coff = chan_offset[cfg.chan_config];
- avctx->channels = ff_mpeg4audio_channels[cfg.chan_config];
- avctx->channel_layout = chan_layout[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));
- if (!s->mp3decctx[0])
- goto alloc_fail;
- // 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));
- if (!s->mp3decctx[i])
- goto alloc_fail;
- s->mp3decctx[i]->adu_mode = 1;
- s->mp3decctx[i]->avctx = avctx;
- s->mp3decctx[i]->mpadsp = s->mp3decctx[0]->mpadsp;
- s->mp3decctx[i]->fdsp = s->mp3decctx[0]->fdsp;
- }
- return 0;
- alloc_fail:
- decode_close_mp3on4(avctx);
- return AVERROR(ENOMEM);
- }
- static void flush_mp3on4(AVCodecContext *avctx)
- {
- int i;
- MP3On4DecodeContext *s = avctx->priv_data;
- for (i = 0; i < s->frames; i++)
- mp_flush(s->mp3decctx[i]);
- }
- static int decode_frame_mp3on4(AVCodecContext *avctx, void *data,
- int *got_frame_ptr, AVPacket *avpkt)
- {
- AVFrame *frame = data;
- 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;
- OUT_INT *outptr[2];
- int fr, ch, ret;
- /* get output buffer */
- frame->nb_samples = MPA_FRAME_SIZE;
- if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
- return ret;
- out_samples = (OUT_INT **)frame->extended_data;
- // Discard too short frames
- if (buf_size < HEADER_SIZE)
- return AVERROR_INVALIDDATA;
- avctx->bit_rate = 0;
- ch = 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];
- av_assert1(m);
- if (fsize < HEADER_SIZE) {
- av_log(avctx, AV_LOG_ERROR, "Frame size smaller than header size\n");
- return AVERROR_INVALIDDATA;
- }
- header = (AV_RB32(buf) & 0x000fffff) | s->syncword; // patch header
- ret = avpriv_mpegaudio_decode_header((MPADecodeHeader *)m, header);
- if (ret < 0) {
- av_log(avctx, AV_LOG_ERROR, "Bad header, discard block\n");
- return AVERROR_INVALIDDATA;
- }
- if (ch + m->nb_channels > avctx->channels ||
- s->coff[fr] + m->nb_channels > avctx->channels) {
- av_log(avctx, AV_LOG_ERROR, "frame channel count exceeds codec "
- "channel count\n");
- return AVERROR_INVALIDDATA;
- }
- ch += m->nb_channels;
- outptr[0] = out_samples[s->coff[fr]];
- if (m->nb_channels > 1)
- outptr[1] = out_samples[s->coff[fr] + 1];
- if ((ret = mp_decode_frame(m, outptr, buf, fsize)) < 0) {
- av_log(avctx, AV_LOG_ERROR, "failed to decode channel %d\n", ch);
- memset(outptr[0], 0, MPA_FRAME_SIZE*sizeof(OUT_INT));
- if (m->nb_channels > 1)
- memset(outptr[1], 0, MPA_FRAME_SIZE*sizeof(OUT_INT));
- ret = m->nb_channels * MPA_FRAME_SIZE*sizeof(OUT_INT);
- }
- out_size += ret;
- buf += fsize;
- len -= fsize;
- avctx->bit_rate += m->bit_rate;
- }
- if (ch != avctx->channels) {
- av_log(avctx, AV_LOG_ERROR, "failed to decode all channels\n");
- return AVERROR_INVALIDDATA;
- }
- /* update codec info */
- avctx->sample_rate = s->mp3decctx[0]->sample_rate;
- frame->nb_samples = out_size / (avctx->channels * sizeof(OUT_INT));
- *got_frame_ptr = 1;
- return buf_size;
- }
- #endif /* CONFIG_MP3ON4_DECODER || CONFIG_MP3ON4FLOAT_DECODER */
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