/* * Copyright (c) 2013, The WebRTC project authors. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * * Neither the name of Google nor the names of its contributors may * be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "avcodec.h" #include "internal.h" #include "get_bits.h" #include "ilbcdata.h" #define LPC_N_20MS 1 #define LPC_N_30MS 2 #define LPC_N_MAX 2 #define LSF_NSPLIT 3 #define NASUB_MAX 4 #define LPC_FILTERORDER 10 #define NSUB_MAX 6 #define SUBL 40 #define ST_MEM_L_TBL 85 #define MEM_LF_TBL 147 #define STATE_SHORT_LEN_20MS 57 #define STATE_SHORT_LEN_30MS 58 #define BLOCKL_MAX 240 #define CB_MEML 147 #define CB_NSTAGES 3 #define CB_HALFFILTERLEN 4 #define CB_FILTERLEN 8 #define ENH_NBLOCKS_TOT 8 #define ENH_BLOCKL 80 #define ENH_BUFL (ENH_NBLOCKS_TOT)*ENH_BLOCKL #define ENH_BUFL_FILTEROVERHEAD 3 #define BLOCKL_MAX 240 #define NSUB_20MS 4 #define NSUB_30MS 6 #define NSUB_MAX 6 #define NASUB_20MS 2 #define NASUB_30MS 4 #define NASUB_MAX 4 #define STATE_LEN 80 #define STATE_SHORT_LEN_30MS 58 #define STATE_SHORT_LEN_20MS 57 #define SPL_MUL_16_16(a, b) ((int32_t) (((int16_t)(a)) * ((int16_t)(b)))) #define SPL_MUL_16_16_RSFT(a, b, c) (SPL_MUL_16_16(a, b) >> (c)) typedef struct ILBCFrame { int16_t lsf[LSF_NSPLIT*LPC_N_MAX]; int16_t cb_index[CB_NSTAGES*(NASUB_MAX + 1)]; int16_t gain_index[CB_NSTAGES*(NASUB_MAX + 1)]; int16_t ifm; int16_t state_first; int16_t idx[STATE_SHORT_LEN_30MS]; int16_t firstbits; int16_t start; } ILBCFrame; typedef struct ILBCContext { AVClass *class; int enhancer; int mode; GetBitContext gb; ILBCFrame frame; int prev_enh_pl; int consPLICount; int last_lag; int state_short_len; int lpc_n; int16_t nasub; int16_t nsub; int block_samples; int16_t no_of_words; int16_t no_of_bytes; int16_t lsfdeq[LPC_FILTERORDER*LPC_N_MAX]; int16_t lsfold[LPC_FILTERORDER]; int16_t syntMem[LPC_FILTERORDER]; int16_t lsfdeqold[LPC_FILTERORDER]; int16_t weightdenum[(LPC_FILTERORDER + 1) * NSUB_MAX]; int16_t syntdenum[NSUB_MAX * (LPC_FILTERORDER + 1)]; int16_t old_syntdenum[NSUB_MAX * (LPC_FILTERORDER + 1)]; int16_t enh_buf[ENH_BUFL+ENH_BUFL_FILTEROVERHEAD]; int16_t enh_period[ENH_NBLOCKS_TOT]; int16_t prevResidual[NSUB_MAX*SUBL]; int16_t decresidual[BLOCKL_MAX]; int16_t plc_residual[BLOCKL_MAX + LPC_FILTERORDER]; int16_t seed; int16_t prevPLI; int16_t prevScale; int16_t prevLag; int16_t per_square; int16_t prev_lpc[LPC_FILTERORDER + 1]; int16_t plc_lpc[LPC_FILTERORDER + 1]; int16_t hpimemx[2]; int16_t hpimemy[4]; } ILBCContext; static int unpack_frame(ILBCContext *s) { ILBCFrame *frame = &s->frame; GetBitContext *gb = &s->gb; int j; frame->lsf[0] = get_bits(gb, 6); frame->lsf[1] = get_bits(gb, 7); frame->lsf[2] = get_bits(gb, 7); if (s->mode == 20) { frame->start = get_bits(gb, 2); frame->state_first = get_bits1(gb); frame->ifm = get_bits(gb, 6); frame->cb_index[0] = get_bits(gb, 6) << 1; frame->gain_index[0] = get_bits(gb, 2) << 3; frame->gain_index[1] = get_bits1(gb) << 3; frame->cb_index[3] = get_bits(gb, 7) << 1; frame->gain_index[3] = get_bits1(gb) << 4; frame->gain_index[4] = get_bits1(gb) << 3; frame->gain_index[6] = get_bits1(gb) << 4; } else { frame->lsf[3] = get_bits(gb, 6); frame->lsf[4] = get_bits(gb, 7); frame->lsf[5] = get_bits(gb, 7); frame->start = get_bits(gb, 3); frame->state_first = get_bits1(gb); frame->ifm = get_bits(gb, 6); frame->cb_index[0] = get_bits(gb, 4) << 3; frame->gain_index[0] = get_bits1(gb) << 4; frame->gain_index[1] = get_bits1(gb) << 3; frame->cb_index[3] = get_bits(gb, 6) << 2; frame->gain_index[3] = get_bits1(gb) << 4; frame->gain_index[4] = get_bits1(gb) << 3; } for (j = 0; j < 48; j++) frame->idx[j] = get_bits1(gb) << 2; if (s->mode == 20) { for (; j < 57; j++) frame->idx[j] = get_bits1(gb) << 2; frame->gain_index[1] |= get_bits1(gb) << 2; frame->gain_index[3] |= get_bits(gb, 2) << 2; frame->gain_index[4] |= get_bits1(gb) << 2; frame->gain_index[6] |= get_bits1(gb) << 3; frame->gain_index[7] = get_bits(gb, 2) << 2; } else { for (; j < 58; j++) frame->idx[j] = get_bits1(gb) << 2; frame->cb_index[0] |= get_bits(gb, 2) << 1; frame->gain_index[0] |= get_bits1(gb) << 3; frame->gain_index[1] |= get_bits1(gb) << 2; frame->cb_index[3] |= get_bits1(gb) << 1; frame->cb_index[6] = get_bits1(gb) << 7; frame->cb_index[6] |= get_bits(gb, 6) << 1; frame->cb_index[9] = get_bits(gb, 7) << 1; frame->cb_index[12] = get_bits(gb, 3) << 5; frame->cb_index[12] |= get_bits(gb, 4) << 1; frame->gain_index[3] |= get_bits(gb, 2) << 2; frame->gain_index[4] |= get_bits(gb, 2) << 1; frame->gain_index[6] = get_bits(gb, 2) << 3; frame->gain_index[7] = get_bits(gb, 2) << 2; frame->gain_index[9] = get_bits1(gb) << 4; frame->gain_index[10] = get_bits1(gb) << 3; frame->gain_index[12] = get_bits1(gb) << 4; frame->gain_index[13] = get_bits1(gb) << 3; } for (j = 0; j < 56; j++) frame->idx[j] |= get_bits(gb, 2); if (s->mode == 20) { frame->idx[56] |= get_bits(gb, 2); frame->cb_index[0] |= get_bits1(gb); frame->cb_index[1] = get_bits(gb, 7); frame->cb_index[2] = get_bits(gb, 6) << 1; frame->cb_index[2] |= get_bits1(gb); frame->gain_index[0] |= get_bits(gb, 3); frame->gain_index[1] |= get_bits(gb, 2); frame->gain_index[2] = get_bits(gb, 3); frame->cb_index[3] |= get_bits1(gb); frame->cb_index[4] = get_bits(gb, 6) << 1; frame->cb_index[4] |= get_bits1(gb); frame->cb_index[5] = get_bits(gb, 7); frame->cb_index[6] = get_bits(gb, 8); frame->cb_index[7] = get_bits(gb, 8); frame->cb_index[8] = get_bits(gb, 8); frame->gain_index[3] |= get_bits(gb, 2); frame->gain_index[4] |= get_bits(gb, 2); frame->gain_index[5] = get_bits(gb, 3); frame->gain_index[6] |= get_bits(gb, 3); frame->gain_index[7] |= get_bits(gb, 2); frame->gain_index[8] = get_bits(gb, 3); } else { frame->idx[56] |= get_bits(gb, 2); frame->idx[57] |= get_bits(gb, 2); frame->cb_index[0] |= get_bits1(gb); frame->cb_index[1] = get_bits(gb, 7); frame->cb_index[2] = get_bits(gb, 4) << 3; frame->cb_index[2] |= get_bits(gb, 3); frame->gain_index[0] |= get_bits(gb, 3); frame->gain_index[1] |= get_bits(gb, 2); frame->gain_index[2] = get_bits(gb, 3); frame->cb_index[3] |= get_bits1(gb); frame->cb_index[4] = get_bits(gb, 4) << 3; frame->cb_index[4] |= get_bits(gb, 3); frame->cb_index[5] = get_bits(gb, 7); frame->cb_index[6] |= get_bits1(gb); frame->cb_index[7] = get_bits(gb, 5) << 3; frame->cb_index[7] |= get_bits(gb, 3); frame->cb_index[8] = get_bits(gb, 8); frame->cb_index[9] |= get_bits1(gb); frame->cb_index[10] = get_bits(gb, 4) << 4; frame->cb_index[10] |= get_bits(gb, 4); frame->cb_index[11] = get_bits(gb, 8); frame->cb_index[12] |= get_bits1(gb); frame->cb_index[13] = get_bits(gb, 3) << 5; frame->cb_index[13] |= get_bits(gb, 5); frame->cb_index[14] = get_bits(gb, 8); frame->gain_index[3] |= get_bits(gb, 2); frame->gain_index[4] |= get_bits1(gb); frame->gain_index[5] = get_bits(gb, 3); frame->gain_index[6] |= get_bits(gb, 3); frame->gain_index[7] |= get_bits(gb, 2); frame->gain_index[8] = get_bits(gb, 3); frame->gain_index[9] |= get_bits(gb, 4); frame->gain_index[10] |= get_bits1(gb) << 2; frame->gain_index[10] |= get_bits(gb, 2); frame->gain_index[11] = get_bits(gb, 3); frame->gain_index[12] |= get_bits(gb, 4); frame->gain_index[13] |= get_bits(gb, 3); frame->gain_index[14] = get_bits(gb, 3); } return get_bits1(gb); } static void index_conv(int16_t *index) { int k; for (k = 4; k < 6; k++) { if (index[k] >= 44 && index[k] < 108) { index[k] += 64; } else if (index[k] >= 108 && index[k] < 128) { index[k] += 128; } } } static void lsf_dequantization(int16_t *lsfdeq, int16_t *index, int16_t lpc_n) { int i, j, pos = 0, cb_pos = 0; for (i = 0; i < LSF_NSPLIT; i++) { for (j = 0; j < lsf_dim_codebook[i]; j++) { lsfdeq[pos + j] = lsf_codebook[cb_pos + index[i] * lsf_dim_codebook[i] + j]; } pos += lsf_dim_codebook[i]; cb_pos += lsf_size_codebook[i] * lsf_dim_codebook[i]; } if (lpc_n > 1) { pos = 0; cb_pos = 0; for (i = 0; i < LSF_NSPLIT; i++) { for (j = 0; j < lsf_dim_codebook[i]; j++) { lsfdeq[LPC_FILTERORDER + pos + j] = lsf_codebook[cb_pos + index[LSF_NSPLIT + i] * lsf_dim_codebook[i] + j]; } pos += lsf_dim_codebook[i]; cb_pos += lsf_size_codebook[i] * lsf_dim_codebook[i]; } } } static void lsf_check_stability(int16_t *lsf, int dim, int nb_vectors) { for (int n = 0; n < 2; n++) { for (int m = 0; m < nb_vectors; m++) { for (int k = 0; k < dim - 1; k++) { int i = m * dim + k; if ((lsf[i + 1] - lsf[i]) < 319) { if (lsf[i + 1] < lsf[i]) { lsf[i + 1] = lsf[i] + 160; lsf[i] = lsf[i + 1] - 160; } else { lsf[i] -= 160; lsf[i + 1] += 160; } } lsf[i] = av_clip(lsf[i], 82, 25723); } } } } static void lsf_interpolate(int16_t *out, int16_t *in1, int16_t *in2, int16_t coef, int size) { int invcoef = 16384 - coef, i; for (i = 0; i < size; i++) out[i] = (coef * in1[i] + invcoef * in2[i] + 8192) >> 14; } static void lsf2lsp(int16_t *lsf, int16_t *lsp, int order) { int16_t diff, freq; int32_t tmp; int i, k; for (i = 0; i < order; i++) { freq = (lsf[i] * 20861) >> 15; /* 20861: 1.0/(2.0*PI) in Q17 */ /* Upper 8 bits give the index k and Lower 8 bits give the difference, which needs to be approximated linearly */ k = FFMIN(freq >> 8, 63); diff = freq & 0xFF; /* Calculate linear approximation */ tmp = cos_derivative_tbl[k] * diff; lsp[i] = cos_tbl[k] + (tmp >> 12); } } static void get_lsp_poly(int16_t *lsp, int32_t *f) { int16_t high, low; int i, j, k, l; int32_t tmp; f[0] = 16777216; f[1] = lsp[0] * -1024; for (i = 2, k = 2, l = 2; i <= 5; i++, k += 2) { f[l] = f[l - 2]; for (j = i; j > 1; j--, l--) { high = f[l - 1] >> 16; low = (f[l - 1] - (high * (1 << 16))) >> 1; tmp = ((high * lsp[k]) * 4) + (((low * lsp[k]) >> 15) * 4); f[l] += f[l - 2]; f[l] -= (unsigned)tmp; } f[l] -= lsp[k] * (1 << 10); l += i; } } static void lsf2poly(int16_t *a, int16_t *lsf) { int32_t f[2][6]; int16_t lsp[10]; int32_t tmp; int i; lsf2lsp(lsf, lsp, LPC_FILTERORDER); get_lsp_poly(&lsp[0], f[0]); get_lsp_poly(&lsp[1], f[1]); for (i = 5; i > 0; i--) { f[0][i] += (unsigned)f[0][i - 1]; f[1][i] -= (unsigned)f[1][i - 1]; } a[0] = 4096; for (i = 5; i > 0; i--) { tmp = f[0][6 - i] + (unsigned)f[1][6 - i] + 4096; a[6 - i] = tmp >> 13; tmp = f[0][6 - i] - (unsigned)f[1][6 - i] + 4096; a[5 + i] = tmp >> 13; } } static void lsp_interpolate2polydec(int16_t *a, int16_t *lsf1, int16_t *lsf2, int coef, int length) { int16_t lsftmp[LPC_FILTERORDER]; lsf_interpolate(lsftmp, lsf1, lsf2, coef, length); lsf2poly(a, lsftmp); } static void bw_expand(int16_t *out, const int16_t *in, const int16_t *coef, int length) { int i; out[0] = in[0]; for (i = 1; i < length; i++) out[i] = (coef[i] * in[i] + 16384) >> 15; } static void lsp_interpolate(int16_t *syntdenum, int16_t *weightdenum, int16_t *lsfdeq, int16_t length, ILBCContext *s) { int16_t lp[LPC_FILTERORDER + 1], *lsfdeq2; int i, pos, lp_length; lsfdeq2 = lsfdeq + length; lp_length = length + 1; if (s->mode == 30) { lsp_interpolate2polydec(lp, (*s).lsfdeqold, lsfdeq, lsf_weight_30ms[0], length); memcpy(syntdenum, lp, lp_length * 2); bw_expand(weightdenum, lp, kLpcChirpSyntDenum, lp_length); pos = lp_length; for (i = 1; i < 6; i++) { lsp_interpolate2polydec(lp, lsfdeq, lsfdeq2, lsf_weight_30ms[i], length); memcpy(syntdenum + pos, lp, lp_length * 2); bw_expand(weightdenum + pos, lp, kLpcChirpSyntDenum, lp_length); pos += lp_length; } } else { pos = 0; for (i = 0; i < s->nsub; i++) { lsp_interpolate2polydec(lp, s->lsfdeqold, lsfdeq, lsf_weight_20ms[i], length); memcpy(syntdenum + pos, lp, lp_length * 2); bw_expand(weightdenum + pos, lp, kLpcChirpSyntDenum, lp_length); pos += lp_length; } } if (s->mode == 30) { memcpy(s->lsfdeqold, lsfdeq2, length * 2); } else { memcpy(s->lsfdeqold, lsfdeq, length * 2); } } static void filter_mafq12(int16_t *in_ptr, int16_t *out_ptr, int16_t *B, int16_t B_length, int16_t length) { int o, i, j; for (i = 0; i < length; i++) { const int16_t *b_ptr = &B[0]; const int16_t *x_ptr = &in_ptr[i]; o = 0; for (j = 0; j < B_length; j++) o += b_ptr[j] * *x_ptr--; o = av_clip(o, -134217728, 134215679); out_ptr[i] = ((o + 2048) >> 12); } } static void filter_arfq12(const int16_t *data_in, int16_t *data_out, const int16_t *coefficients, int coefficients_length, int data_length) { int i, j; for (i = 0; i < data_length; i++) { int output = 0, sum = 0; for (j = coefficients_length - 1; j > 0; j--) { sum += (unsigned)(coefficients[j] * data_out[i - j]); } output = coefficients[0] * data_in[i] - (unsigned)sum; output = av_clip(output, -134217728, 134215679); data_out[i] = (output + 2048) >> 12; } } static void state_construct(int16_t ifm, int16_t *idx, int16_t *synt_denum, int16_t *Out_fix, int16_t len) { int k; int16_t maxVal; int16_t *tmp1, *tmp2, *tmp3; /* Stack based */ int16_t numerator[1 + LPC_FILTERORDER]; int16_t sampleValVec[2 * STATE_SHORT_LEN_30MS + LPC_FILTERORDER]; int16_t sampleMaVec[2 * STATE_SHORT_LEN_30MS + LPC_FILTERORDER]; int16_t *sampleVal = &sampleValVec[LPC_FILTERORDER]; int16_t *sampleMa = &sampleMaVec[LPC_FILTERORDER]; int16_t *sampleAr = &sampleValVec[LPC_FILTERORDER]; /* initialization of coefficients */ for (k = 0; k < LPC_FILTERORDER + 1; k++) { numerator[k] = synt_denum[LPC_FILTERORDER - k]; } /* decoding of the maximum value */ maxVal = frg_quant_mod[ifm]; /* decoding of the sample values */ tmp1 = sampleVal; tmp2 = &idx[len - 1]; if (ifm < 37) { for (k = 0; k < len; k++) { /*the shifting is due to the Q13 in sq4_fixQ13[i], also the adding of 2097152 (= 0.5 << 22) maxVal is in Q8 and result is in Q(-1) */ (*tmp1) = (int16_t) ((SPL_MUL_16_16(maxVal, ilbc_state[(*tmp2)]) + 2097152) >> 22); tmp1++; tmp2--; } } else if (ifm < 59) { for (k = 0; k < len; k++) { /*the shifting is due to the Q13 in sq4_fixQ13[i], also the adding of 262144 (= 0.5 << 19) maxVal is in Q5 and result is in Q(-1) */ (*tmp1) = (int16_t) ((SPL_MUL_16_16(maxVal, ilbc_state[(*tmp2)]) + 262144) >> 19); tmp1++; tmp2--; } } else { for (k = 0; k < len; k++) { /*the shifting is due to the Q13 in sq4_fixQ13[i], also the adding of 65536 (= 0.5 << 17) maxVal is in Q3 and result is in Q(-1) */ (*tmp1) = (int16_t) ((SPL_MUL_16_16(maxVal, ilbc_state[(*tmp2)]) + 65536) >> 17); tmp1++; tmp2--; } } /* Set the rest of the data to zero */ memset(&sampleVal[len], 0, len * 2); /* circular convolution with all-pass filter */ /* Set the state to zero */ memset(sampleValVec, 0, LPC_FILTERORDER * 2); /* Run MA filter + AR filter */ filter_mafq12(sampleVal, sampleMa, numerator, LPC_FILTERORDER + 1, len + LPC_FILTERORDER); memset(&sampleMa[len + LPC_FILTERORDER], 0, (len - LPC_FILTERORDER) * 2); filter_arfq12(sampleMa, sampleAr, synt_denum, LPC_FILTERORDER + 1, 2 * len); tmp1 = &sampleAr[len - 1]; tmp2 = &sampleAr[2 * len - 1]; tmp3 = Out_fix; for (k = 0; k < len; k++) { (*tmp3) = (*tmp1) + (*tmp2); tmp1--; tmp2--; tmp3++; } } static int16_t gain_dequantization(int index, int max_in, int stage) { int16_t scale = FFMAX(1638, FFABS(max_in)); return ((scale * ilbc_gain[stage][index]) + 8192) >> 14; } static void vector_rmultiplication(int16_t *out, const int16_t *in, const int16_t *win, int length, int shift) { for (int i = 0; i < length; i++) out[i] = (in[i] * win[-i]) >> shift; } static void vector_multiplication(int16_t *out, const int16_t *in, const int16_t *win, int length, int shift) { for (int i = 0; i < length; i++) out[i] = (in[i] * win[i]) >> shift; } static void add_vector_and_shift(int16_t *out, const int16_t *in1, const int16_t *in2, int length, int shift) { for (int i = 0; i < length; i++) out[i] = (in1[i] + in2[i]) >> shift; } static void create_augmented_vector(int index, int16_t *buffer, int16_t *cbVec) { int16_t cbVecTmp[4]; int interpolation_length = FFMIN(4, index); int16_t ilow = index - interpolation_length; memcpy(cbVec, buffer - index, index * 2); vector_multiplication(&cbVec[ilow], buffer - index - interpolation_length, alpha, interpolation_length, 15); vector_rmultiplication(cbVecTmp, buffer - interpolation_length, &alpha[interpolation_length - 1], interpolation_length, 15); add_vector_and_shift(&cbVec[ilow], &cbVec[ilow], cbVecTmp, interpolation_length, 0); memcpy(cbVec + index, buffer - index, FFMIN(SUBL - index, index) * sizeof(*cbVec)); } static void get_codebook(int16_t * cbvec, /* (o) Constructed codebook vector */ int16_t * mem, /* (i) Codebook buffer */ int16_t index, /* (i) Codebook index */ int16_t lMem, /* (i) Length of codebook buffer */ int16_t cbveclen /* (i) Codebook vector length */ ) { int16_t k, base_size; int16_t lag; /* Stack based */ int16_t tempbuff2[SUBL + 5]; /* Determine size of codebook sections */ base_size = lMem - cbveclen + 1; if (cbveclen == SUBL) { base_size += cbveclen / 2; } /* No filter -> First codebook section */ if (index < lMem - cbveclen + 1) { /* first non-interpolated vectors */ k = index + cbveclen; /* get vector */ memcpy(cbvec, mem + lMem - k, cbveclen * 2); } else if (index < base_size) { /* Calculate lag */ k = (int16_t) SPL_MUL_16_16(2, (index - (lMem - cbveclen + 1))) + cbveclen; lag = k / 2; create_augmented_vector(lag, mem + lMem, cbvec); } else { int16_t memIndTest; /* first non-interpolated vectors */ if (index - base_size < lMem - cbveclen + 1) { /* Set up filter memory, stuff zeros outside memory buffer */ memIndTest = lMem - (index - base_size + cbveclen); memset(mem - CB_HALFFILTERLEN, 0, CB_HALFFILTERLEN * 2); memset(mem + lMem, 0, CB_HALFFILTERLEN * 2); /* do filtering to get the codebook vector */ filter_mafq12(&mem[memIndTest + 4], cbvec, (int16_t *) kCbFiltersRev, CB_FILTERLEN, cbveclen); } else { /* interpolated vectors */ /* Stuff zeros outside memory buffer */ memIndTest = lMem - cbveclen - CB_FILTERLEN; memset(mem + lMem, 0, CB_HALFFILTERLEN * 2); /* do filtering */ filter_mafq12(&mem[memIndTest + 7], tempbuff2, (int16_t *) kCbFiltersRev, CB_FILTERLEN, (int16_t) (cbveclen + 5)); /* Calculate lag index */ lag = (cbveclen << 1) - 20 + index - base_size - lMem - 1; create_augmented_vector(lag, tempbuff2 + SUBL + 5, cbvec); } } } static void construct_vector ( int16_t *decvector, /* (o) Decoded vector */ int16_t *index, /* (i) Codebook indices */ int16_t *gain_index, /* (i) Gain quantization indices */ int16_t *mem, /* (i) Buffer for codevector construction */ int16_t lMem, /* (i) Length of buffer */ int16_t veclen) { int16_t gain[CB_NSTAGES]; int16_t cbvec0[SUBL]; int16_t cbvec1[SUBL]; int16_t cbvec2[SUBL]; unsigned a32; int16_t *gainPtr; int j; /* gain de-quantization */ gain[0] = gain_dequantization(gain_index[0], 16384, 0); gain[1] = gain_dequantization(gain_index[1], gain[0], 1); gain[2] = gain_dequantization(gain_index[2], gain[1], 2); /* codebook vector construction and construction of total vector */ /* Stack based */ get_codebook(cbvec0, mem, index[0], lMem, veclen); get_codebook(cbvec1, mem, index[1], lMem, veclen); get_codebook(cbvec2, mem, index[2], lMem, veclen); gainPtr = &gain[0]; for (j = 0; j < veclen; j++) { a32 = SPL_MUL_16_16(*gainPtr++, cbvec0[j]); a32 += SPL_MUL_16_16(*gainPtr++, cbvec1[j]); a32 += SPL_MUL_16_16(*gainPtr, cbvec2[j]); gainPtr -= 2; decvector[j] = (int)(a32 + 8192) >> 14; } } static void reverse_memcpy(int16_t *dest, int16_t *source, int length) { int16_t* destPtr = dest; int16_t* sourcePtr = source; int j; for (j = 0; j < length; j++) *destPtr-- = *sourcePtr++; } static void decode_residual(ILBCContext *s, ILBCFrame *encbits, int16_t *decresidual, int16_t *syntdenum) { int16_t meml_gotten, Nfor, Nback, diff, start_pos; int16_t subcount, subframe; int16_t *reverseDecresidual = s->enh_buf; /* Reversed decoded data, used for decoding backwards in time (reuse memory in state) */ int16_t *memVec = s->prevResidual; int16_t *mem = &memVec[CB_HALFFILTERLEN]; /* Memory for codebook */ diff = STATE_LEN - s->state_short_len; if (encbits->state_first == 1) { start_pos = (encbits->start - 1) * SUBL; } else { start_pos = (encbits->start - 1) * SUBL + diff; } /* decode scalar part of start state */ state_construct(encbits->ifm, encbits->idx, &syntdenum[(encbits->start - 1) * (LPC_FILTERORDER + 1)], &decresidual[start_pos], s->state_short_len); if (encbits->state_first) { /* put adaptive part in the end */ /* setup memory */ memset(mem, 0, (int16_t) (CB_MEML - s->state_short_len) * 2); memcpy(mem + CB_MEML - s->state_short_len, decresidual + start_pos, s->state_short_len * 2); /* construct decoded vector */ construct_vector(&decresidual[start_pos + s->state_short_len], encbits->cb_index, encbits->gain_index, mem + CB_MEML - ST_MEM_L_TBL, ST_MEM_L_TBL, (int16_t) diff); } else { /* put adaptive part in the beginning */ /* setup memory */ meml_gotten = s->state_short_len; reverse_memcpy(mem + CB_MEML - 1, decresidual + start_pos, meml_gotten); memset(mem, 0, (int16_t) (CB_MEML - meml_gotten) * 2); /* construct decoded vector */ construct_vector(reverseDecresidual, encbits->cb_index, encbits->gain_index, mem + CB_MEML - ST_MEM_L_TBL, ST_MEM_L_TBL, diff); /* get decoded residual from reversed vector */ reverse_memcpy(&decresidual[start_pos - 1], reverseDecresidual, diff); } /* counter for predicted subframes */ subcount = 1; /* forward prediction of subframes */ Nfor = s->nsub - encbits->start - 1; if (Nfor > 0) { /* setup memory */ memset(mem, 0, (CB_MEML - STATE_LEN) * 2); memcpy(mem + CB_MEML - STATE_LEN, decresidual + (encbits->start - 1) * SUBL, STATE_LEN * 2); /* loop over subframes to encode */ for (subframe = 0; subframe < Nfor; subframe++) { /* construct decoded vector */ construct_vector(&decresidual[(encbits->start + 1 + subframe) * SUBL], encbits->cb_index + subcount * CB_NSTAGES, encbits->gain_index + subcount * CB_NSTAGES, mem, MEM_LF_TBL, SUBL); /* update memory */ memmove(mem, mem + SUBL, (CB_MEML - SUBL) * sizeof(*mem)); memcpy(mem + CB_MEML - SUBL, &decresidual[(encbits->start + 1 + subframe) * SUBL], SUBL * 2); subcount++; } } /* backward prediction of subframes */ Nback = encbits->start - 1; if (Nback > 0) { /* setup memory */ meml_gotten = SUBL * (s->nsub + 1 - encbits->start); if (meml_gotten > CB_MEML) { meml_gotten = CB_MEML; } reverse_memcpy(mem + CB_MEML - 1, decresidual + (encbits->start - 1) * SUBL, meml_gotten); memset(mem, 0, (int16_t) (CB_MEML - meml_gotten) * 2); /* loop over subframes to decode */ for (subframe = 0; subframe < Nback; subframe++) { /* construct decoded vector */ construct_vector(&reverseDecresidual[subframe * SUBL], encbits->cb_index + subcount * CB_NSTAGES, encbits->gain_index + subcount * CB_NSTAGES, mem, MEM_LF_TBL, SUBL); /* update memory */ memmove(mem, mem + SUBL, (CB_MEML - SUBL) * sizeof(*mem)); memcpy(mem + CB_MEML - SUBL, &reverseDecresidual[subframe * SUBL], SUBL * 2); subcount++; } /* get decoded residual from reversed vector */ reverse_memcpy(decresidual + SUBL * Nback - 1, reverseDecresidual, SUBL * Nback); } } static int16_t max_abs_value_w16(const int16_t* vector, int length) { int i = 0, absolute = 0, maximum = 0; if (vector == NULL || length <= 0) { return -1; } for (i = 0; i < length; i++) { absolute = FFABS(vector[i]); if (absolute > maximum) maximum = absolute; } // Guard the case for abs(-32768). return FFMIN(maximum, INT16_MAX); } static int16_t get_size_in_bits(uint32_t n) { int16_t bits; if (0xFFFF0000 & n) { bits = 16; } else { bits = 0; } if (0x0000FF00 & (n >> bits)) bits += 8; if (0x000000F0 & (n >> bits)) bits += 4; if (0x0000000C & (n >> bits)) bits += 2; if (0x00000002 & (n >> bits)) bits += 1; if (0x00000001 & (n >> bits)) bits += 1; return bits; } static int32_t scale_dot_product(const int16_t *v1, const int16_t *v2, int length, int scaling) { int64_t sum = 0; for (int i = 0; i < length; i++) sum += (v1[i] * v2[i]) >> scaling; return av_clipl_int32(sum); } static void correlation(int32_t *corr, int32_t *ener, int16_t *buffer, int16_t lag, int16_t blen, int16_t srange, int16_t scale) { int16_t *w16ptr; w16ptr = &buffer[blen - srange - lag]; *corr = scale_dot_product(&buffer[blen - srange], w16ptr, srange, scale); *ener = scale_dot_product(w16ptr, w16ptr, srange, scale); if (*ener == 0) { *corr = 0; *ener = 1; } } #define SPL_SHIFT_W32(x, c) (((c) >= 0) ? ((x) << (c)) : ((x) >> (-(c)))) static int16_t norm_w32(int32_t a) { if (a == 0) { return 0; } else if (a < 0) { a = ~a; } return ff_clz(a); } static int32_t div_w32_w16(int32_t num, int16_t den) { if (den != 0) return num / den; else return 0x7FFFFFFF; } static void do_plc(int16_t *plc_residual, /* (o) concealed residual */ int16_t *plc_lpc, /* (o) concealed LP parameters */ int16_t PLI, /* (i) packet loss indicator 0 - no PL, 1 = PL */ int16_t *decresidual, /* (i) decoded residual */ int16_t *lpc, /* (i) decoded LPC (only used for no PL) */ int16_t inlag, /* (i) pitch lag */ ILBCContext *s) /* (i/o) decoder instance */ { int16_t i, pick; int32_t cross, ener, cross_comp, ener_comp = 0; int32_t measure, max_measure, energy; int16_t max, cross_square_max, cross_square; int16_t j, lag, tmp1, tmp2, randlag; int16_t shift1, shift2, shift3, shift_max; int16_t scale3; int16_t corrLen; int32_t tmpW32, tmp2W32; int16_t use_gain; int16_t tot_gain; int16_t max_perSquare; int16_t scale1, scale2; int16_t totscale; int32_t nom; int16_t denom; int16_t pitchfact; int16_t use_lag; int ind; int16_t randvec[BLOCKL_MAX]; /* Packet Loss */ if (PLI == 1) { s->consPLICount += 1; /* if previous frame not lost, determine pitch pred. gain */ if (s->prevPLI != 1) { /* Maximum 60 samples are correlated, preserve as high accuracy as possible without getting overflow */ max = max_abs_value_w16(s->prevResidual, s->block_samples); scale3 = (get_size_in_bits(max) << 1) - 25; if (scale3 < 0) { scale3 = 0; } /* Store scale for use when interpolating between the * concealment and the received packet */ s->prevScale = scale3; /* Search around the previous lag +/-3 to find the best pitch period */ lag = inlag - 3; /* Guard against getting outside the frame */ corrLen = FFMIN(60, s->block_samples - (inlag + 3)); correlation(&cross, &ener, s->prevResidual, lag, s->block_samples, corrLen, scale3); /* Normalize and store cross^2 and the number of shifts */ shift_max = get_size_in_bits(FFABS(cross)) - 15; cross_square_max = (int16_t) SPL_MUL_16_16_RSFT(SPL_SHIFT_W32(cross, -shift_max), SPL_SHIFT_W32(cross, -shift_max), 15); for (j = inlag - 2; j <= inlag + 3; j++) { correlation(&cross_comp, &ener_comp, s->prevResidual, j, s->block_samples, corrLen, scale3); /* Use the criteria (corr*corr)/energy to compare if this lag is better or not. To avoid the division, do a cross multiplication */ shift1 = get_size_in_bits(FFABS(cross_comp)) - 15; cross_square = (int16_t) SPL_MUL_16_16_RSFT(SPL_SHIFT_W32(cross_comp, -shift1), SPL_SHIFT_W32(cross_comp, -shift1), 15); shift2 = get_size_in_bits(ener) - 15; measure = SPL_MUL_16_16(SPL_SHIFT_W32(ener, -shift2), cross_square); shift3 = get_size_in_bits(ener_comp) - 15; max_measure = SPL_MUL_16_16(SPL_SHIFT_W32(ener_comp, -shift3), cross_square_max); /* Calculate shift value, so that the two measures can be put in the same Q domain */ if (((shift_max << 1) + shift3) > ((shift1 << 1) + shift2)) { tmp1 = FFMIN(31, (shift_max << 1) + shift3 - (shift1 << 1) - shift2); tmp2 = 0; } else { tmp1 = 0; tmp2 = FFMIN(31, (shift1 << 1) + shift2 - (shift_max << 1) - shift3); } if ((measure >> tmp1) > (max_measure >> tmp2)) { /* New lag is better => record lag, measure and domain */ lag = j; cross_square_max = cross_square; cross = cross_comp; shift_max = shift1; ener = ener_comp; } } /* Calculate the periodicity for the lag with the maximum correlation. Definition of the periodicity: abs(corr(vec1, vec2))/(sqrt(energy(vec1))*sqrt(energy(vec2))) Work in the Square domain to simplify the calculations max_perSquare is less than 1 (in Q15) */ tmp2W32 = scale_dot_product(&s->prevResidual[s->block_samples - corrLen], &s->prevResidual[s->block_samples - corrLen], corrLen, scale3); if ((tmp2W32 > 0) && (ener_comp > 0)) { /* norm energies to int16_t, compute the product of the energies and use the upper int16_t as the denominator */ scale1 = norm_w32(tmp2W32) - 16; tmp1 = SPL_SHIFT_W32(tmp2W32, scale1); scale2 = norm_w32(ener) - 16; tmp2 = SPL_SHIFT_W32(ener, scale2); denom = SPL_MUL_16_16_RSFT(tmp1, tmp2, 16); /* denom in Q(scale1+scale2-16) */ /* Square the cross correlation and norm it such that max_perSquare will be in Q15 after the division */ totscale = scale1 + scale2 - 1; tmp1 = SPL_SHIFT_W32(cross, (totscale >> 1)); tmp2 = SPL_SHIFT_W32(cross, totscale - (totscale >> 1)); nom = SPL_MUL_16_16(tmp1, tmp2); max_perSquare = div_w32_w16(nom, denom); } else { max_perSquare = 0; } } else { /* previous frame lost, use recorded lag and gain */ lag = s->prevLag; max_perSquare = s->per_square; } /* Attenuate signal and scale down pitch pred gain if several frames lost consecutively */ use_gain = 32767; /* 1.0 in Q15 */ if (s->consPLICount * s->block_samples > 320) { use_gain = 29491; /* 0.9 in Q15 */ } else if (s->consPLICount * s->block_samples > 640) { use_gain = 22938; /* 0.7 in Q15 */ } else if (s->consPLICount * s->block_samples > 960) { use_gain = 16384; /* 0.5 in Q15 */ } else if (s->consPLICount * s->block_samples > 1280) { use_gain = 0; /* 0.0 in Q15 */ } /* Compute mixing factor of picth repeatition and noise: for max_per>0.7 set periodicity to 1.0 0.4 7868) { /* periodicity > 0.7 (0.7^4=0.2401 in Q15) */ pitchfact = 32767; } else if (max_perSquare > 839) { /* 0.4 < periodicity < 0.7 (0.4^4=0.0256 in Q15) */ /* find best index and interpolate from that */ ind = 5; while ((max_perSquare < kPlcPerSqr[ind]) && (ind > 0)) { ind--; } /* pitch fact is approximated by first order */ tmpW32 = kPlcPitchFact[ind] + SPL_MUL_16_16_RSFT(kPlcPfSlope[ind], (max_perSquare - kPlcPerSqr[ind]), 11); pitchfact = FFMIN(tmpW32, 32767); /* guard against overflow */ } else { /* periodicity < 0.4 */ pitchfact = 0; } /* avoid repetition of same pitch cycle (buzzyness) */ use_lag = lag; if (lag < 80) { use_lag = 2 * lag; } /* compute concealed residual */ energy = 0; for (i = 0; i < s->block_samples; i++) { /* noise component - 52 < randlagFIX < 117 */ s->seed = SPL_MUL_16_16(s->seed, 31821) + 13849; randlag = 53 + (s->seed & 63); pick = i - randlag; if (pick < 0) { randvec[i] = s->prevResidual[s->block_samples + pick]; } else { randvec[i] = s->prevResidual[pick]; } /* pitch repeatition component */ pick = i - use_lag; if (pick < 0) { plc_residual[i] = s->prevResidual[s->block_samples + pick]; } else { plc_residual[i] = plc_residual[pick]; } /* Attinuate total gain for each 10 ms */ if (i < 80) { tot_gain = use_gain; } else if (i < 160) { tot_gain = SPL_MUL_16_16_RSFT(31130, use_gain, 15); /* 0.95*use_gain */ } else { tot_gain = SPL_MUL_16_16_RSFT(29491, use_gain, 15); /* 0.9*use_gain */ } /* mix noise and pitch repeatition */ plc_residual[i] = SPL_MUL_16_16_RSFT(tot_gain, (pitchfact * plc_residual[i] + (32767 - pitchfact) * randvec[i] + 16384) >> 15, 15); /* Shifting down the result one step extra to ensure that no overflow will occur */ energy += SPL_MUL_16_16_RSFT(plc_residual[i], plc_residual[i], (s->prevScale + 1)); } /* less than 30 dB, use only noise */ if (energy < SPL_SHIFT_W32(s->block_samples * 900, -s->prevScale - 1)) { energy = 0; for (i = 0; i < s->block_samples; i++) { plc_residual[i] = randvec[i]; } } /* use the old LPC */ memcpy(plc_lpc, (*s).prev_lpc, (LPC_FILTERORDER + 1) * 2); /* Update state in case there are multiple frame losses */ s->prevLag = lag; s->per_square = max_perSquare; } else { /* no packet loss, copy input */ memcpy(plc_residual, decresidual, s->block_samples * 2); memcpy(plc_lpc, lpc, (LPC_FILTERORDER + 1) * 2); s->consPLICount = 0; } /* update state */ s->prevPLI = PLI; memcpy(s->prev_lpc, plc_lpc, (LPC_FILTERORDER + 1) * 2); memcpy(s->prevResidual, plc_residual, s->block_samples * 2); return; } static int xcorr_coeff(int16_t *target, int16_t *regressor, int16_t subl, int16_t searchLen, int16_t offset, int16_t step) { int16_t maxlag; int16_t pos; int16_t max; int16_t cross_corr_scale, energy_scale; int16_t cross_corr_sg_mod, cross_corr_sg_mod_max; int32_t cross_corr, energy; int16_t cross_corr_mod, energy_mod, enery_mod_max; int16_t *tp, *rp; int16_t *rp_beg, *rp_end; int16_t totscale, totscale_max; int16_t scalediff; int32_t new_crit, max_crit; int shifts; int k; /* Initializations, to make sure that the first one is selected */ cross_corr_sg_mod_max = 0; enery_mod_max = INT16_MAX; totscale_max = -500; maxlag = 0; pos = 0; /* Find scale value and start position */ if (step == 1) { max = max_abs_value_w16(regressor, (int16_t) (subl + searchLen - 1)); rp_beg = regressor; rp_end = ®ressor[subl]; } else { /* step== -1 */ max = max_abs_value_w16(®ressor[-searchLen], (int16_t) (subl + searchLen - 1)); rp_beg = ®ressor[-1]; rp_end = ®ressor[subl - 1]; } /* Introduce a scale factor on the energy in int32_t in order to make sure that the calculation does not overflow */ if (max > 5000) { shifts = 2; } else { shifts = 0; } /* Calculate the first energy, then do a +/- to get the other energies */ energy = scale_dot_product(regressor, regressor, subl, shifts); for (k = 0; k < searchLen; k++) { tp = target; rp = ®ressor[pos]; cross_corr = scale_dot_product(tp, rp, subl, shifts); if ((energy > 0) && (cross_corr > 0)) { /* Put cross correlation and energy on 16 bit word */ cross_corr_scale = norm_w32(cross_corr) - 16; cross_corr_mod = (int16_t) SPL_SHIFT_W32(cross_corr, cross_corr_scale); energy_scale = norm_w32(energy) - 16; energy_mod = (int16_t) SPL_SHIFT_W32(energy, energy_scale); /* Square cross correlation and store upper int16_t */ cross_corr_sg_mod = (int16_t) SPL_MUL_16_16_RSFT(cross_corr_mod, cross_corr_mod, 16); /* Calculate the total number of (dynamic) right shifts that have been performed on (cross_corr*cross_corr)/energy */ totscale = energy_scale - (cross_corr_scale * 2); /* Calculate the shift difference in order to be able to compare the two (cross_corr*cross_corr)/energy in the same domain */ scalediff = totscale - totscale_max; scalediff = FFMIN(scalediff, 31); scalediff = FFMAX(scalediff, -31); /* Compute the cross multiplication between the old best criteria and the new one to be able to compare them without using a division */ if (scalediff < 0) { new_crit = ((int32_t) cross_corr_sg_mod * enery_mod_max) >> (-scalediff); max_crit = ((int32_t) cross_corr_sg_mod_max * energy_mod); } else { new_crit = ((int32_t) cross_corr_sg_mod * enery_mod_max); max_crit = ((int32_t) cross_corr_sg_mod_max * energy_mod) >> scalediff; } /* Store the new lag value if the new criteria is larger than previous largest criteria */ if (new_crit > max_crit) { cross_corr_sg_mod_max = cross_corr_sg_mod; enery_mod_max = energy_mod; totscale_max = totscale; maxlag = k; } } pos += step; /* Do a +/- to get the next energy */ energy += (unsigned)step * ((*rp_end * *rp_end - *rp_beg * *rp_beg) >> shifts); rp_beg += step; rp_end += step; } return maxlag + offset; } static void hp_output(int16_t *signal, const int16_t *ba, int16_t *y, int16_t *x, int16_t len) { int32_t tmp; for (int i = 0; i < len; i++) { tmp = SPL_MUL_16_16(y[1], ba[3]); /* (-a[1])*y[i-1] (low part) */ tmp += SPL_MUL_16_16(y[3], ba[4]); /* (-a[2])*y[i-2] (low part) */ tmp = (tmp >> 15); tmp += SPL_MUL_16_16(y[0], ba[3]); /* (-a[1])*y[i-1] (high part) */ tmp += SPL_MUL_16_16(y[2], ba[4]); /* (-a[2])*y[i-2] (high part) */ tmp = (tmp * 2); tmp += SPL_MUL_16_16(signal[i], ba[0]); /* b[0]*x[0] */ tmp += SPL_MUL_16_16(x[0], ba[1]); /* b[1]*x[i-1] */ tmp += SPL_MUL_16_16(x[1], ba[2]); /* b[2]*x[i-2] */ /* Update state (input part) */ x[1] = x[0]; x[0] = signal[i]; /* Convert back to Q0 and multiply with 2 */ signal[i] = av_clip_intp2(tmp + 1024, 26) >> 11; /* Update state (filtered part) */ y[2] = y[0]; y[3] = y[1]; /* upshift tmp by 3 with saturation */ if (tmp > 268435455) { tmp = INT32_MAX; } else if (tmp < -268435456) { tmp = INT32_MIN; } else { tmp = tmp * 8; } y[0] = tmp >> 16; y[1] = (tmp - (y[0] * (1 << 16))) >> 1; } } static int ilbc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; AVFrame *frame = data; ILBCContext *s = avctx->priv_data; int mode = s->mode, ret; int16_t *plc_data = &s->plc_residual[LPC_FILTERORDER]; if ((ret = init_get_bits8(&s->gb, buf, avpkt->size)) < 0) return ret; memset(&s->frame, 0, sizeof(ILBCFrame)); frame->nb_samples = s->block_samples; if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) return ret; if (unpack_frame(s)) mode = 0; if (s->frame.start < 1 || s->frame.start > 5) mode = 0; if (mode) { index_conv(s->frame.cb_index); lsf_dequantization(s->lsfdeq, s->frame.lsf, s->lpc_n); lsf_check_stability(s->lsfdeq, LPC_FILTERORDER, s->lpc_n); lsp_interpolate(s->syntdenum, s->weightdenum, s->lsfdeq, LPC_FILTERORDER, s); decode_residual(s, &s->frame, s->decresidual, s->syntdenum); do_plc(s->plc_residual, s->plc_lpc, 0, s->decresidual, s->syntdenum + (LPC_FILTERORDER + 1) * (s->nsub - 1), s->last_lag, s); memcpy(s->decresidual, s->plc_residual, s->block_samples * 2); } if (s->enhancer) { /* TODO */ } else { int16_t lag, i; /* Find last lag (since the enhancer is not called to give this info) */ if (s->mode == 20) { lag = xcorr_coeff(&s->decresidual[s->block_samples-60], &s->decresidual[s->block_samples-80], 60, 80, 20, -1); } else { lag = xcorr_coeff(&s->decresidual[s->block_samples-ENH_BLOCKL], &s->decresidual[s->block_samples-ENH_BLOCKL-20], ENH_BLOCKL, 100, 20, -1); } /* Store lag (it is needed if next packet is lost) */ s->last_lag = lag; /* copy data and run synthesis filter */ memcpy(plc_data, s->decresidual, s->block_samples * 2); /* Set up the filter state */ memcpy(&plc_data[-LPC_FILTERORDER], s->syntMem, LPC_FILTERORDER * 2); for (i = 0; i < s->nsub; i++) { filter_arfq12(plc_data+i*SUBL, plc_data+i*SUBL, s->syntdenum + i*(LPC_FILTERORDER + 1), LPC_FILTERORDER + 1, SUBL); } /* Save the filter state */ memcpy(s->syntMem, &plc_data[s->block_samples-LPC_FILTERORDER], LPC_FILTERORDER * 2); } memcpy(frame->data[0], plc_data, s->block_samples * 2); hp_output((int16_t *)frame->data[0], hp_out_coeffs, s->hpimemy, s->hpimemx, s->block_samples); memcpy(s->old_syntdenum, s->syntdenum, s->nsub*(LPC_FILTERORDER + 1) * 2); s->prev_enh_pl = 0; if (mode == 0) s->prev_enh_pl = 1; *got_frame_ptr = 1; return avpkt->size; } static av_cold int ilbc_decode_init(AVCodecContext *avctx) { ILBCContext *s = avctx->priv_data; if (avctx->block_align == 38) s->mode = 20; else if (avctx->block_align == 50) s->mode = 30; else if (avctx->bit_rate > 0) s->mode = avctx->bit_rate <= 14000 ? 30 : 20; else return AVERROR_INVALIDDATA; avctx->channels = 1; avctx->channel_layout = AV_CH_LAYOUT_MONO; avctx->sample_rate = 8000; avctx->sample_fmt = AV_SAMPLE_FMT_S16; if (s->mode == 30) { s->block_samples = 240; s->nsub = NSUB_30MS; s->nasub = NASUB_30MS; s->lpc_n = LPC_N_30MS; s->state_short_len = STATE_SHORT_LEN_30MS; } else { s->block_samples = 160; s->nsub = NSUB_20MS; s->nasub = NASUB_20MS; s->lpc_n = LPC_N_20MS; s->state_short_len = STATE_SHORT_LEN_20MS; } return 0; } AVCodec ff_ilbc_decoder = { .name = "ilbc", .long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"), .type = AVMEDIA_TYPE_AUDIO, .id = AV_CODEC_ID_ILBC, .init = ilbc_decode_init, .decode = ilbc_decode_frame, .capabilities = AV_CODEC_CAP_DR1, .priv_data_size = sizeof(ILBCContext), };