yading@10: /* yading@10: * G.723.1 compatible decoder yading@10: * Copyright (c) 2006 Benjamin Larsson yading@10: * Copyright (c) 2010 Mohamed Naufal Basheer yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * G.723.1 compatible decoder yading@10: */ yading@10: yading@10: #define BITSTREAM_READER_LE yading@10: #include "libavutil/channel_layout.h" yading@10: #include "libavutil/mem.h" yading@10: #include "libavutil/opt.h" yading@10: #include "avcodec.h" yading@10: #include "internal.h" yading@10: #include "get_bits.h" yading@10: #include "acelp_vectors.h" yading@10: #include "celp_filters.h" yading@10: #include "celp_math.h" yading@10: #include "g723_1_data.h" yading@10: #include "internal.h" yading@10: yading@10: #define CNG_RANDOM_SEED 12345 yading@10: yading@10: typedef struct g723_1_context { yading@10: AVClass *class; yading@10: yading@10: G723_1_Subframe subframe[4]; yading@10: enum FrameType cur_frame_type; yading@10: enum FrameType past_frame_type; yading@10: enum Rate cur_rate; yading@10: uint8_t lsp_index[LSP_BANDS]; yading@10: int pitch_lag[2]; yading@10: int erased_frames; yading@10: yading@10: int16_t prev_lsp[LPC_ORDER]; yading@10: int16_t sid_lsp[LPC_ORDER]; yading@10: int16_t prev_excitation[PITCH_MAX]; yading@10: int16_t excitation[PITCH_MAX + FRAME_LEN + 4]; yading@10: int16_t synth_mem[LPC_ORDER]; yading@10: int16_t fir_mem[LPC_ORDER]; yading@10: int iir_mem[LPC_ORDER]; yading@10: yading@10: int random_seed; yading@10: int cng_random_seed; yading@10: int interp_index; yading@10: int interp_gain; yading@10: int sid_gain; yading@10: int cur_gain; yading@10: int reflection_coef; yading@10: int pf_gain; ///< formant postfilter yading@10: ///< gain scaling unit memory yading@10: int postfilter; yading@10: yading@10: int16_t audio[FRAME_LEN + LPC_ORDER + PITCH_MAX + 4]; yading@10: int16_t prev_data[HALF_FRAME_LEN]; yading@10: int16_t prev_weight_sig[PITCH_MAX]; yading@10: yading@10: yading@10: int16_t hpf_fir_mem; ///< highpass filter fir yading@10: int hpf_iir_mem; ///< and iir memories yading@10: int16_t perf_fir_mem[LPC_ORDER]; ///< perceptual filter fir yading@10: int16_t perf_iir_mem[LPC_ORDER]; ///< and iir memories yading@10: yading@10: int16_t harmonic_mem[PITCH_MAX]; yading@10: } G723_1_Context; yading@10: yading@10: static av_cold int g723_1_decode_init(AVCodecContext *avctx) yading@10: { yading@10: G723_1_Context *p = avctx->priv_data; yading@10: yading@10: avctx->channel_layout = AV_CH_LAYOUT_MONO; yading@10: avctx->sample_fmt = AV_SAMPLE_FMT_S16; yading@10: avctx->channels = 1; yading@10: p->pf_gain = 1 << 12; yading@10: yading@10: memcpy(p->prev_lsp, dc_lsp, LPC_ORDER * sizeof(*p->prev_lsp)); yading@10: memcpy(p->sid_lsp, dc_lsp, LPC_ORDER * sizeof(*p->sid_lsp)); yading@10: yading@10: p->cng_random_seed = CNG_RANDOM_SEED; yading@10: p->past_frame_type = SID_FRAME; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: * Unpack the frame into parameters. yading@10: * yading@10: * @param p the context yading@10: * @param buf pointer to the input buffer yading@10: * @param buf_size size of the input buffer yading@10: */ yading@10: static int unpack_bitstream(G723_1_Context *p, const uint8_t *buf, yading@10: int buf_size) yading@10: { yading@10: GetBitContext gb; yading@10: int ad_cb_len; yading@10: int temp, info_bits, i; yading@10: yading@10: init_get_bits(&gb, buf, buf_size * 8); yading@10: yading@10: /* Extract frame type and rate info */ yading@10: info_bits = get_bits(&gb, 2); yading@10: yading@10: if (info_bits == 3) { yading@10: p->cur_frame_type = UNTRANSMITTED_FRAME; yading@10: return 0; yading@10: } yading@10: yading@10: /* Extract 24 bit lsp indices, 8 bit for each band */ yading@10: p->lsp_index[2] = get_bits(&gb, 8); yading@10: p->lsp_index[1] = get_bits(&gb, 8); yading@10: p->lsp_index[0] = get_bits(&gb, 8); yading@10: yading@10: if (info_bits == 2) { yading@10: p->cur_frame_type = SID_FRAME; yading@10: p->subframe[0].amp_index = get_bits(&gb, 6); yading@10: return 0; yading@10: } yading@10: yading@10: /* Extract the info common to both rates */ yading@10: p->cur_rate = info_bits ? RATE_5300 : RATE_6300; yading@10: p->cur_frame_type = ACTIVE_FRAME; yading@10: yading@10: p->pitch_lag[0] = get_bits(&gb, 7); yading@10: if (p->pitch_lag[0] > 123) /* test if forbidden code */ yading@10: return -1; yading@10: p->pitch_lag[0] += PITCH_MIN; yading@10: p->subframe[1].ad_cb_lag = get_bits(&gb, 2); yading@10: yading@10: p->pitch_lag[1] = get_bits(&gb, 7); yading@10: if (p->pitch_lag[1] > 123) yading@10: return -1; yading@10: p->pitch_lag[1] += PITCH_MIN; yading@10: p->subframe[3].ad_cb_lag = get_bits(&gb, 2); yading@10: p->subframe[0].ad_cb_lag = 1; yading@10: p->subframe[2].ad_cb_lag = 1; yading@10: yading@10: for (i = 0; i < SUBFRAMES; i++) { yading@10: /* Extract combined gain */ yading@10: temp = get_bits(&gb, 12); yading@10: ad_cb_len = 170; yading@10: p->subframe[i].dirac_train = 0; yading@10: if (p->cur_rate == RATE_6300 && p->pitch_lag[i >> 1] < SUBFRAME_LEN - 2) { yading@10: p->subframe[i].dirac_train = temp >> 11; yading@10: temp &= 0x7FF; yading@10: ad_cb_len = 85; yading@10: } yading@10: p->subframe[i].ad_cb_gain = FASTDIV(temp, GAIN_LEVELS); yading@10: if (p->subframe[i].ad_cb_gain < ad_cb_len) { yading@10: p->subframe[i].amp_index = temp - p->subframe[i].ad_cb_gain * yading@10: GAIN_LEVELS; yading@10: } else { yading@10: return -1; yading@10: } yading@10: } yading@10: yading@10: p->subframe[0].grid_index = get_bits1(&gb); yading@10: p->subframe[1].grid_index = get_bits1(&gb); yading@10: p->subframe[2].grid_index = get_bits1(&gb); yading@10: p->subframe[3].grid_index = get_bits1(&gb); yading@10: yading@10: if (p->cur_rate == RATE_6300) { yading@10: skip_bits1(&gb); /* skip reserved bit */ yading@10: yading@10: /* Compute pulse_pos index using the 13-bit combined position index */ yading@10: temp = get_bits(&gb, 13); yading@10: p->subframe[0].pulse_pos = temp / 810; yading@10: yading@10: temp -= p->subframe[0].pulse_pos * 810; yading@10: p->subframe[1].pulse_pos = FASTDIV(temp, 90); yading@10: yading@10: temp -= p->subframe[1].pulse_pos * 90; yading@10: p->subframe[2].pulse_pos = FASTDIV(temp, 9); yading@10: p->subframe[3].pulse_pos = temp - p->subframe[2].pulse_pos * 9; yading@10: yading@10: p->subframe[0].pulse_pos = (p->subframe[0].pulse_pos << 16) + yading@10: get_bits(&gb, 16); yading@10: p->subframe[1].pulse_pos = (p->subframe[1].pulse_pos << 14) + yading@10: get_bits(&gb, 14); yading@10: p->subframe[2].pulse_pos = (p->subframe[2].pulse_pos << 16) + yading@10: get_bits(&gb, 16); yading@10: p->subframe[3].pulse_pos = (p->subframe[3].pulse_pos << 14) + yading@10: get_bits(&gb, 14); yading@10: yading@10: p->subframe[0].pulse_sign = get_bits(&gb, 6); yading@10: p->subframe[1].pulse_sign = get_bits(&gb, 5); yading@10: p->subframe[2].pulse_sign = get_bits(&gb, 6); yading@10: p->subframe[3].pulse_sign = get_bits(&gb, 5); yading@10: } else { /* 5300 bps */ yading@10: p->subframe[0].pulse_pos = get_bits(&gb, 12); yading@10: p->subframe[1].pulse_pos = get_bits(&gb, 12); yading@10: p->subframe[2].pulse_pos = get_bits(&gb, 12); yading@10: p->subframe[3].pulse_pos = get_bits(&gb, 12); yading@10: yading@10: p->subframe[0].pulse_sign = get_bits(&gb, 4); yading@10: p->subframe[1].pulse_sign = get_bits(&gb, 4); yading@10: p->subframe[2].pulse_sign = get_bits(&gb, 4); yading@10: p->subframe[3].pulse_sign = get_bits(&gb, 4); yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: * Bitexact implementation of sqrt(val/2). yading@10: */ yading@10: static int16_t square_root(unsigned val) yading@10: { yading@10: av_assert2(!(val & 0x80000000)); yading@10: yading@10: return (ff_sqrt(val << 1) >> 1) & (~1); yading@10: } yading@10: yading@10: /** yading@10: * Calculate the number of left-shifts required for normalizing the input. yading@10: * yading@10: * @param num input number yading@10: * @param width width of the input, 15 or 31 bits yading@10: */ yading@10: static int normalize_bits(int num, int width) yading@10: { yading@10: return width - av_log2(num) - 1; yading@10: } yading@10: yading@10: #define normalize_bits_int16(num) normalize_bits(num, 15) yading@10: #define normalize_bits_int32(num) normalize_bits(num, 31) yading@10: yading@10: /** yading@10: * Scale vector contents based on the largest of their absolutes. yading@10: */ yading@10: static int scale_vector(int16_t *dst, const int16_t *vector, int length) yading@10: { yading@10: int bits, max = 0; yading@10: int i; yading@10: yading@10: for (i = 0; i < length; i++) yading@10: max |= FFABS(vector[i]); yading@10: yading@10: bits= 14 - av_log2_16bit(max); yading@10: bits= FFMAX(bits, 0); yading@10: yading@10: for (i = 0; i < length; i++) yading@10: dst[i] = vector[i] << bits >> 3; yading@10: yading@10: return bits - 3; yading@10: } yading@10: yading@10: /** yading@10: * Perform inverse quantization of LSP frequencies. yading@10: * yading@10: * @param cur_lsp the current LSP vector yading@10: * @param prev_lsp the previous LSP vector yading@10: * @param lsp_index VQ indices yading@10: * @param bad_frame bad frame flag yading@10: */ yading@10: static void inverse_quant(int16_t *cur_lsp, int16_t *prev_lsp, yading@10: uint8_t *lsp_index, int bad_frame) yading@10: { yading@10: int min_dist, pred; yading@10: int i, j, temp, stable; yading@10: yading@10: /* Check for frame erasure */ yading@10: if (!bad_frame) { yading@10: min_dist = 0x100; yading@10: pred = 12288; yading@10: } else { yading@10: min_dist = 0x200; yading@10: pred = 23552; yading@10: lsp_index[0] = lsp_index[1] = lsp_index[2] = 0; yading@10: } yading@10: yading@10: /* Get the VQ table entry corresponding to the transmitted index */ yading@10: cur_lsp[0] = lsp_band0[lsp_index[0]][0]; yading@10: cur_lsp[1] = lsp_band0[lsp_index[0]][1]; yading@10: cur_lsp[2] = lsp_band0[lsp_index[0]][2]; yading@10: cur_lsp[3] = lsp_band1[lsp_index[1]][0]; yading@10: cur_lsp[4] = lsp_band1[lsp_index[1]][1]; yading@10: cur_lsp[5] = lsp_band1[lsp_index[1]][2]; yading@10: cur_lsp[6] = lsp_band2[lsp_index[2]][0]; yading@10: cur_lsp[7] = lsp_band2[lsp_index[2]][1]; yading@10: cur_lsp[8] = lsp_band2[lsp_index[2]][2]; yading@10: cur_lsp[9] = lsp_band2[lsp_index[2]][3]; yading@10: yading@10: /* Add predicted vector & DC component to the previously quantized vector */ yading@10: for (i = 0; i < LPC_ORDER; i++) { yading@10: temp = ((prev_lsp[i] - dc_lsp[i]) * pred + (1 << 14)) >> 15; yading@10: cur_lsp[i] += dc_lsp[i] + temp; yading@10: } yading@10: yading@10: for (i = 0; i < LPC_ORDER; i++) { yading@10: cur_lsp[0] = FFMAX(cur_lsp[0], 0x180); yading@10: cur_lsp[LPC_ORDER - 1] = FFMIN(cur_lsp[LPC_ORDER - 1], 0x7e00); yading@10: yading@10: /* Stability check */ yading@10: for (j = 1; j < LPC_ORDER; j++) { yading@10: temp = min_dist + cur_lsp[j - 1] - cur_lsp[j]; yading@10: if (temp > 0) { yading@10: temp >>= 1; yading@10: cur_lsp[j - 1] -= temp; yading@10: cur_lsp[j] += temp; yading@10: } yading@10: } yading@10: stable = 1; yading@10: for (j = 1; j < LPC_ORDER; j++) { yading@10: temp = cur_lsp[j - 1] + min_dist - cur_lsp[j] - 4; yading@10: if (temp > 0) { yading@10: stable = 0; yading@10: break; yading@10: } yading@10: } yading@10: if (stable) yading@10: break; yading@10: } yading@10: if (!stable) yading@10: memcpy(cur_lsp, prev_lsp, LPC_ORDER * sizeof(*cur_lsp)); yading@10: } yading@10: yading@10: /** yading@10: * Bitexact implementation of 2ab scaled by 1/2^16. yading@10: * yading@10: * @param a 32 bit multiplicand yading@10: * @param b 16 bit multiplier yading@10: */ yading@10: #define MULL2(a, b) \ yading@10: MULL(a,b,15) yading@10: yading@10: /** yading@10: * Convert LSP frequencies to LPC coefficients. yading@10: * yading@10: * @param lpc buffer for LPC coefficients yading@10: */ yading@10: static void lsp2lpc(int16_t *lpc) yading@10: { yading@10: int f1[LPC_ORDER / 2 + 1]; yading@10: int f2[LPC_ORDER / 2 + 1]; yading@10: int i, j; yading@10: yading@10: /* Calculate negative cosine */ yading@10: for (j = 0; j < LPC_ORDER; j++) { yading@10: int index = (lpc[j] >> 7) & 0x1FF; yading@10: int offset = lpc[j] & 0x7f; yading@10: int temp1 = cos_tab[index] << 16; yading@10: int temp2 = (cos_tab[index + 1] - cos_tab[index]) * yading@10: ((offset << 8) + 0x80) << 1; yading@10: yading@10: lpc[j] = -(av_sat_dadd32(1 << 15, temp1 + temp2) >> 16); yading@10: } yading@10: yading@10: /* yading@10: * Compute sum and difference polynomial coefficients yading@10: * (bitexact alternative to lsp2poly() in lsp.c) yading@10: */ yading@10: /* Initialize with values in Q28 */ yading@10: f1[0] = 1 << 28; yading@10: f1[1] = (lpc[0] << 14) + (lpc[2] << 14); yading@10: f1[2] = lpc[0] * lpc[2] + (2 << 28); yading@10: yading@10: f2[0] = 1 << 28; yading@10: f2[1] = (lpc[1] << 14) + (lpc[3] << 14); yading@10: f2[2] = lpc[1] * lpc[3] + (2 << 28); yading@10: yading@10: /* yading@10: * Calculate and scale the coefficients by 1/2 in yading@10: * each iteration for a final scaling factor of Q25 yading@10: */ yading@10: for (i = 2; i < LPC_ORDER / 2; i++) { yading@10: f1[i + 1] = f1[i - 1] + MULL2(f1[i], lpc[2 * i]); yading@10: f2[i + 1] = f2[i - 1] + MULL2(f2[i], lpc[2 * i + 1]); yading@10: yading@10: for (j = i; j >= 2; j--) { yading@10: f1[j] = MULL2(f1[j - 1], lpc[2 * i]) + yading@10: (f1[j] >> 1) + (f1[j - 2] >> 1); yading@10: f2[j] = MULL2(f2[j - 1], lpc[2 * i + 1]) + yading@10: (f2[j] >> 1) + (f2[j - 2] >> 1); yading@10: } yading@10: yading@10: f1[0] >>= 1; yading@10: f2[0] >>= 1; yading@10: f1[1] = ((lpc[2 * i] << 16 >> i) + f1[1]) >> 1; yading@10: f2[1] = ((lpc[2 * i + 1] << 16 >> i) + f2[1]) >> 1; yading@10: } yading@10: yading@10: /* Convert polynomial coefficients to LPC coefficients */ yading@10: for (i = 0; i < LPC_ORDER / 2; i++) { yading@10: int64_t ff1 = f1[i + 1] + f1[i]; yading@10: int64_t ff2 = f2[i + 1] - f2[i]; yading@10: yading@10: lpc[i] = av_clipl_int32(((ff1 + ff2) << 3) + (1 << 15)) >> 16; yading@10: lpc[LPC_ORDER - i - 1] = av_clipl_int32(((ff1 - ff2) << 3) + yading@10: (1 << 15)) >> 16; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Quantize LSP frequencies by interpolation and convert them to yading@10: * the corresponding LPC coefficients. yading@10: * yading@10: * @param lpc buffer for LPC coefficients yading@10: * @param cur_lsp the current LSP vector yading@10: * @param prev_lsp the previous LSP vector yading@10: */ yading@10: static void lsp_interpolate(int16_t *lpc, int16_t *cur_lsp, int16_t *prev_lsp) yading@10: { yading@10: int i; yading@10: int16_t *lpc_ptr = lpc; yading@10: yading@10: /* cur_lsp * 0.25 + prev_lsp * 0.75 */ yading@10: ff_acelp_weighted_vector_sum(lpc, cur_lsp, prev_lsp, yading@10: 4096, 12288, 1 << 13, 14, LPC_ORDER); yading@10: ff_acelp_weighted_vector_sum(lpc + LPC_ORDER, cur_lsp, prev_lsp, yading@10: 8192, 8192, 1 << 13, 14, LPC_ORDER); yading@10: ff_acelp_weighted_vector_sum(lpc + 2 * LPC_ORDER, cur_lsp, prev_lsp, yading@10: 12288, 4096, 1 << 13, 14, LPC_ORDER); yading@10: memcpy(lpc + 3 * LPC_ORDER, cur_lsp, LPC_ORDER * sizeof(*lpc)); yading@10: yading@10: for (i = 0; i < SUBFRAMES; i++) { yading@10: lsp2lpc(lpc_ptr); yading@10: lpc_ptr += LPC_ORDER; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Generate a train of dirac functions with period as pitch lag. yading@10: */ yading@10: static void gen_dirac_train(int16_t *buf, int pitch_lag) yading@10: { yading@10: int16_t vector[SUBFRAME_LEN]; yading@10: int i, j; yading@10: yading@10: memcpy(vector, buf, SUBFRAME_LEN * sizeof(*vector)); yading@10: for (i = pitch_lag; i < SUBFRAME_LEN; i += pitch_lag) { yading@10: for (j = 0; j < SUBFRAME_LEN - i; j++) yading@10: buf[i + j] += vector[j]; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Generate fixed codebook excitation vector. yading@10: * yading@10: * @param vector decoded excitation vector yading@10: * @param subfrm current subframe yading@10: * @param cur_rate current bitrate yading@10: * @param pitch_lag closed loop pitch lag yading@10: * @param index current subframe index yading@10: */ yading@10: static void gen_fcb_excitation(int16_t *vector, G723_1_Subframe *subfrm, yading@10: enum Rate cur_rate, int pitch_lag, int index) yading@10: { yading@10: int temp, i, j; yading@10: yading@10: memset(vector, 0, SUBFRAME_LEN * sizeof(*vector)); yading@10: yading@10: if (cur_rate == RATE_6300) { yading@10: if (subfrm->pulse_pos >= max_pos[index]) yading@10: return; yading@10: yading@10: /* Decode amplitudes and positions */ yading@10: j = PULSE_MAX - pulses[index]; yading@10: temp = subfrm->pulse_pos; yading@10: for (i = 0; i < SUBFRAME_LEN / GRID_SIZE; i++) { yading@10: temp -= combinatorial_table[j][i]; yading@10: if (temp >= 0) yading@10: continue; yading@10: temp += combinatorial_table[j++][i]; yading@10: if (subfrm->pulse_sign & (1 << (PULSE_MAX - j))) { yading@10: vector[subfrm->grid_index + GRID_SIZE * i] = yading@10: -fixed_cb_gain[subfrm->amp_index]; yading@10: } else { yading@10: vector[subfrm->grid_index + GRID_SIZE * i] = yading@10: fixed_cb_gain[subfrm->amp_index]; yading@10: } yading@10: if (j == PULSE_MAX) yading@10: break; yading@10: } yading@10: if (subfrm->dirac_train == 1) yading@10: gen_dirac_train(vector, pitch_lag); yading@10: } else { /* 5300 bps */ yading@10: int cb_gain = fixed_cb_gain[subfrm->amp_index]; yading@10: int cb_shift = subfrm->grid_index; yading@10: int cb_sign = subfrm->pulse_sign; yading@10: int cb_pos = subfrm->pulse_pos; yading@10: int offset, beta, lag; yading@10: yading@10: for (i = 0; i < 8; i += 2) { yading@10: offset = ((cb_pos & 7) << 3) + cb_shift + i; yading@10: vector[offset] = (cb_sign & 1) ? cb_gain : -cb_gain; yading@10: cb_pos >>= 3; yading@10: cb_sign >>= 1; yading@10: } yading@10: yading@10: /* Enhance harmonic components */ yading@10: lag = pitch_contrib[subfrm->ad_cb_gain << 1] + pitch_lag + yading@10: subfrm->ad_cb_lag - 1; yading@10: beta = pitch_contrib[(subfrm->ad_cb_gain << 1) + 1]; yading@10: yading@10: if (lag < SUBFRAME_LEN - 2) { yading@10: for (i = lag; i < SUBFRAME_LEN; i++) yading@10: vector[i] += beta * vector[i - lag] >> 15; yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Get delayed contribution from the previous excitation vector. yading@10: */ yading@10: static void get_residual(int16_t *residual, int16_t *prev_excitation, int lag) yading@10: { yading@10: int offset = PITCH_MAX - PITCH_ORDER / 2 - lag; yading@10: int i; yading@10: yading@10: residual[0] = prev_excitation[offset]; yading@10: residual[1] = prev_excitation[offset + 1]; yading@10: yading@10: offset += 2; yading@10: for (i = 2; i < SUBFRAME_LEN + PITCH_ORDER - 1; i++) yading@10: residual[i] = prev_excitation[offset + (i - 2) % lag]; yading@10: } yading@10: yading@10: static int dot_product(const int16_t *a, const int16_t *b, int length) yading@10: { yading@10: int sum = ff_dot_product(a,b,length); yading@10: return av_sat_add32(sum, sum); yading@10: } yading@10: yading@10: /** yading@10: * Generate adaptive codebook excitation. yading@10: */ yading@10: static void gen_acb_excitation(int16_t *vector, int16_t *prev_excitation, yading@10: int pitch_lag, G723_1_Subframe *subfrm, yading@10: enum Rate cur_rate) yading@10: { yading@10: int16_t residual[SUBFRAME_LEN + PITCH_ORDER - 1]; yading@10: const int16_t *cb_ptr; yading@10: int lag = pitch_lag + subfrm->ad_cb_lag - 1; yading@10: yading@10: int i; yading@10: int sum; yading@10: yading@10: get_residual(residual, prev_excitation, lag); yading@10: yading@10: /* Select quantization table */ yading@10: if (cur_rate == RATE_6300 && pitch_lag < SUBFRAME_LEN - 2) { yading@10: cb_ptr = adaptive_cb_gain85; yading@10: } else yading@10: cb_ptr = adaptive_cb_gain170; yading@10: yading@10: /* Calculate adaptive vector */ yading@10: cb_ptr += subfrm->ad_cb_gain * 20; yading@10: for (i = 0; i < SUBFRAME_LEN; i++) { yading@10: sum = ff_dot_product(residual + i, cb_ptr, PITCH_ORDER); yading@10: vector[i] = av_sat_dadd32(1 << 15, av_sat_add32(sum, sum)) >> 16; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Estimate maximum auto-correlation around pitch lag. yading@10: * yading@10: * @param buf buffer with offset applied yading@10: * @param offset offset of the excitation vector yading@10: * @param ccr_max pointer to the maximum auto-correlation yading@10: * @param pitch_lag decoded pitch lag yading@10: * @param length length of autocorrelation yading@10: * @param dir forward lag(1) / backward lag(-1) yading@10: */ yading@10: static int autocorr_max(const int16_t *buf, int offset, int *ccr_max, yading@10: int pitch_lag, int length, int dir) yading@10: { yading@10: int limit, ccr, lag = 0; yading@10: int i; yading@10: yading@10: pitch_lag = FFMIN(PITCH_MAX - 3, pitch_lag); yading@10: if (dir > 0) yading@10: limit = FFMIN(FRAME_LEN + PITCH_MAX - offset - length, pitch_lag + 3); yading@10: else yading@10: limit = pitch_lag + 3; yading@10: yading@10: for (i = pitch_lag - 3; i <= limit; i++) { yading@10: ccr = dot_product(buf, buf + dir * i, length); yading@10: yading@10: if (ccr > *ccr_max) { yading@10: *ccr_max = ccr; yading@10: lag = i; yading@10: } yading@10: } yading@10: return lag; yading@10: } yading@10: yading@10: /** yading@10: * Calculate pitch postfilter optimal and scaling gains. yading@10: * yading@10: * @param lag pitch postfilter forward/backward lag yading@10: * @param ppf pitch postfilter parameters yading@10: * @param cur_rate current bitrate yading@10: * @param tgt_eng target energy yading@10: * @param ccr cross-correlation yading@10: * @param res_eng residual energy yading@10: */ yading@10: static void comp_ppf_gains(int lag, PPFParam *ppf, enum Rate cur_rate, yading@10: int tgt_eng, int ccr, int res_eng) yading@10: { yading@10: int pf_residual; /* square of postfiltered residual */ yading@10: int temp1, temp2; yading@10: yading@10: ppf->index = lag; yading@10: yading@10: temp1 = tgt_eng * res_eng >> 1; yading@10: temp2 = ccr * ccr << 1; yading@10: yading@10: if (temp2 > temp1) { yading@10: if (ccr >= res_eng) { yading@10: ppf->opt_gain = ppf_gain_weight[cur_rate]; yading@10: } else { yading@10: ppf->opt_gain = (ccr << 15) / res_eng * yading@10: ppf_gain_weight[cur_rate] >> 15; yading@10: } yading@10: /* pf_res^2 = tgt_eng + 2*ccr*gain + res_eng*gain^2 */ yading@10: temp1 = (tgt_eng << 15) + (ccr * ppf->opt_gain << 1); yading@10: temp2 = (ppf->opt_gain * ppf->opt_gain >> 15) * res_eng; yading@10: pf_residual = av_sat_add32(temp1, temp2 + (1 << 15)) >> 16; yading@10: yading@10: if (tgt_eng >= pf_residual << 1) { yading@10: temp1 = 0x7fff; yading@10: } else { yading@10: temp1 = (tgt_eng << 14) / pf_residual; yading@10: } yading@10: yading@10: /* scaling_gain = sqrt(tgt_eng/pf_res^2) */ yading@10: ppf->sc_gain = square_root(temp1 << 16); yading@10: } else { yading@10: ppf->opt_gain = 0; yading@10: ppf->sc_gain = 0x7fff; yading@10: } yading@10: yading@10: ppf->opt_gain = av_clip_int16(ppf->opt_gain * ppf->sc_gain >> 15); yading@10: } yading@10: yading@10: /** yading@10: * Calculate pitch postfilter parameters. yading@10: * yading@10: * @param p the context yading@10: * @param offset offset of the excitation vector yading@10: * @param pitch_lag decoded pitch lag yading@10: * @param ppf pitch postfilter parameters yading@10: * @param cur_rate current bitrate yading@10: */ yading@10: static void comp_ppf_coeff(G723_1_Context *p, int offset, int pitch_lag, yading@10: PPFParam *ppf, enum Rate cur_rate) yading@10: { yading@10: yading@10: int16_t scale; yading@10: int i; yading@10: int temp1, temp2; yading@10: yading@10: /* yading@10: * 0 - target energy yading@10: * 1 - forward cross-correlation yading@10: * 2 - forward residual energy yading@10: * 3 - backward cross-correlation yading@10: * 4 - backward residual energy yading@10: */ yading@10: int energy[5] = {0, 0, 0, 0, 0}; yading@10: int16_t *buf = p->audio + LPC_ORDER + offset; yading@10: int fwd_lag = autocorr_max(buf, offset, &energy[1], pitch_lag, yading@10: SUBFRAME_LEN, 1); yading@10: int back_lag = autocorr_max(buf, offset, &energy[3], pitch_lag, yading@10: SUBFRAME_LEN, -1); yading@10: yading@10: ppf->index = 0; yading@10: ppf->opt_gain = 0; yading@10: ppf->sc_gain = 0x7fff; yading@10: yading@10: /* Case 0, Section 3.6 */ yading@10: if (!back_lag && !fwd_lag) yading@10: return; yading@10: yading@10: /* Compute target energy */ yading@10: energy[0] = dot_product(buf, buf, SUBFRAME_LEN); yading@10: yading@10: /* Compute forward residual energy */ yading@10: if (fwd_lag) yading@10: energy[2] = dot_product(buf + fwd_lag, buf + fwd_lag, SUBFRAME_LEN); yading@10: yading@10: /* Compute backward residual energy */ yading@10: if (back_lag) yading@10: energy[4] = dot_product(buf - back_lag, buf - back_lag, SUBFRAME_LEN); yading@10: yading@10: /* Normalize and shorten */ yading@10: temp1 = 0; yading@10: for (i = 0; i < 5; i++) yading@10: temp1 = FFMAX(energy[i], temp1); yading@10: yading@10: scale = normalize_bits(temp1, 31); yading@10: for (i = 0; i < 5; i++) yading@10: energy[i] = (energy[i] << scale) >> 16; yading@10: yading@10: if (fwd_lag && !back_lag) { /* Case 1 */ yading@10: comp_ppf_gains(fwd_lag, ppf, cur_rate, energy[0], energy[1], yading@10: energy[2]); yading@10: } else if (!fwd_lag) { /* Case 2 */ yading@10: comp_ppf_gains(-back_lag, ppf, cur_rate, energy[0], energy[3], yading@10: energy[4]); yading@10: } else { /* Case 3 */ yading@10: yading@10: /* yading@10: * Select the largest of energy[1]^2/energy[2] yading@10: * and energy[3]^2/energy[4] yading@10: */ yading@10: temp1 = energy[4] * ((energy[1] * energy[1] + (1 << 14)) >> 15); yading@10: temp2 = energy[2] * ((energy[3] * energy[3] + (1 << 14)) >> 15); yading@10: if (temp1 >= temp2) { yading@10: comp_ppf_gains(fwd_lag, ppf, cur_rate, energy[0], energy[1], yading@10: energy[2]); yading@10: } else { yading@10: comp_ppf_gains(-back_lag, ppf, cur_rate, energy[0], energy[3], yading@10: energy[4]); yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Classify frames as voiced/unvoiced. yading@10: * yading@10: * @param p the context yading@10: * @param pitch_lag decoded pitch_lag yading@10: * @param exc_eng excitation energy estimation yading@10: * @param scale scaling factor of exc_eng yading@10: * yading@10: * @return residual interpolation index if voiced, 0 otherwise yading@10: */ yading@10: static int comp_interp_index(G723_1_Context *p, int pitch_lag, yading@10: int *exc_eng, int *scale) yading@10: { yading@10: int offset = PITCH_MAX + 2 * SUBFRAME_LEN; yading@10: int16_t *buf = p->audio + LPC_ORDER; yading@10: yading@10: int index, ccr, tgt_eng, best_eng, temp; yading@10: yading@10: *scale = scale_vector(buf, p->excitation, FRAME_LEN + PITCH_MAX); yading@10: buf += offset; yading@10: yading@10: /* Compute maximum backward cross-correlation */ yading@10: ccr = 0; yading@10: index = autocorr_max(buf, offset, &ccr, pitch_lag, SUBFRAME_LEN * 2, -1); yading@10: ccr = av_sat_add32(ccr, 1 << 15) >> 16; yading@10: yading@10: /* Compute target energy */ yading@10: tgt_eng = dot_product(buf, buf, SUBFRAME_LEN * 2); yading@10: *exc_eng = av_sat_add32(tgt_eng, 1 << 15) >> 16; yading@10: yading@10: if (ccr <= 0) yading@10: return 0; yading@10: yading@10: /* Compute best energy */ yading@10: best_eng = dot_product(buf - index, buf - index, SUBFRAME_LEN * 2); yading@10: best_eng = av_sat_add32(best_eng, 1 << 15) >> 16; yading@10: yading@10: temp = best_eng * *exc_eng >> 3; yading@10: yading@10: if (temp < ccr * ccr) { yading@10: return index; yading@10: } else yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: * Peform residual interpolation based on frame classification. yading@10: * yading@10: * @param buf decoded excitation vector yading@10: * @param out output vector yading@10: * @param lag decoded pitch lag yading@10: * @param gain interpolated gain yading@10: * @param rseed seed for random number generator yading@10: */ yading@10: static void residual_interp(int16_t *buf, int16_t *out, int lag, yading@10: int gain, int *rseed) yading@10: { yading@10: int i; yading@10: if (lag) { /* Voiced */ yading@10: int16_t *vector_ptr = buf + PITCH_MAX; yading@10: /* Attenuate */ yading@10: for (i = 0; i < lag; i++) yading@10: out[i] = vector_ptr[i - lag] * 3 >> 2; yading@10: av_memcpy_backptr((uint8_t*)(out + lag), lag * sizeof(*out), yading@10: (FRAME_LEN - lag) * sizeof(*out)); yading@10: } else { /* Unvoiced */ yading@10: for (i = 0; i < FRAME_LEN; i++) { yading@10: *rseed = *rseed * 521 + 259; yading@10: out[i] = gain * *rseed >> 15; yading@10: } yading@10: memset(buf, 0, (FRAME_LEN + PITCH_MAX) * sizeof(*buf)); yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Perform IIR filtering. yading@10: * yading@10: * @param fir_coef FIR coefficients yading@10: * @param iir_coef IIR coefficients yading@10: * @param src source vector yading@10: * @param dest destination vector yading@10: * @param width width of the output, 16 bits(0) / 32 bits(1) yading@10: */ yading@10: #define iir_filter(fir_coef, iir_coef, src, dest, width)\ yading@10: {\ yading@10: int m, n;\ yading@10: int res_shift = 16 & ~-(width);\ yading@10: int in_shift = 16 - res_shift;\ yading@10: \ yading@10: for (m = 0; m < SUBFRAME_LEN; m++) {\ yading@10: int64_t filter = 0;\ yading@10: for (n = 1; n <= LPC_ORDER; n++) {\ yading@10: filter -= (fir_coef)[n - 1] * (src)[m - n] -\ yading@10: (iir_coef)[n - 1] * ((dest)[m - n] >> in_shift);\ yading@10: }\ yading@10: \ yading@10: (dest)[m] = av_clipl_int32(((src)[m] << 16) + (filter << 3) +\ yading@10: (1 << 15)) >> res_shift;\ yading@10: }\ yading@10: } yading@10: yading@10: /** yading@10: * Adjust gain of postfiltered signal. yading@10: * yading@10: * @param p the context yading@10: * @param buf postfiltered output vector yading@10: * @param energy input energy coefficient yading@10: */ yading@10: static void gain_scale(G723_1_Context *p, int16_t * buf, int energy) yading@10: { yading@10: int num, denom, gain, bits1, bits2; yading@10: int i; yading@10: yading@10: num = energy; yading@10: denom = 0; yading@10: for (i = 0; i < SUBFRAME_LEN; i++) { yading@10: int temp = buf[i] >> 2; yading@10: temp *= temp; yading@10: denom = av_sat_dadd32(denom, temp); yading@10: } yading@10: yading@10: if (num && denom) { yading@10: bits1 = normalize_bits(num, 31); yading@10: bits2 = normalize_bits(denom, 31); yading@10: num = num << bits1 >> 1; yading@10: denom <<= bits2; yading@10: yading@10: bits2 = 5 + bits1 - bits2; yading@10: bits2 = FFMAX(0, bits2); yading@10: yading@10: gain = (num >> 1) / (denom >> 16); yading@10: gain = square_root(gain << 16 >> bits2); yading@10: } else { yading@10: gain = 1 << 12; yading@10: } yading@10: yading@10: for (i = 0; i < SUBFRAME_LEN; i++) { yading@10: p->pf_gain = (15 * p->pf_gain + gain + (1 << 3)) >> 4; yading@10: buf[i] = av_clip_int16((buf[i] * (p->pf_gain + (p->pf_gain >> 4)) + yading@10: (1 << 10)) >> 11); yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Perform formant filtering. yading@10: * yading@10: * @param p the context yading@10: * @param lpc quantized lpc coefficients yading@10: * @param buf input buffer yading@10: * @param dst output buffer yading@10: */ yading@10: static void formant_postfilter(G723_1_Context *p, int16_t *lpc, yading@10: int16_t *buf, int16_t *dst) yading@10: { yading@10: int16_t filter_coef[2][LPC_ORDER]; yading@10: int filter_signal[LPC_ORDER + FRAME_LEN], *signal_ptr; yading@10: int i, j, k; yading@10: yading@10: memcpy(buf, p->fir_mem, LPC_ORDER * sizeof(*buf)); yading@10: memcpy(filter_signal, p->iir_mem, LPC_ORDER * sizeof(*filter_signal)); yading@10: yading@10: for (i = LPC_ORDER, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) { yading@10: for (k = 0; k < LPC_ORDER; k++) { yading@10: filter_coef[0][k] = (-lpc[k] * postfilter_tbl[0][k] + yading@10: (1 << 14)) >> 15; yading@10: filter_coef[1][k] = (-lpc[k] * postfilter_tbl[1][k] + yading@10: (1 << 14)) >> 15; yading@10: } yading@10: iir_filter(filter_coef[0], filter_coef[1], buf + i, yading@10: filter_signal + i, 1); yading@10: lpc += LPC_ORDER; yading@10: } yading@10: yading@10: memcpy(p->fir_mem, buf + FRAME_LEN, LPC_ORDER * sizeof(int16_t)); yading@10: memcpy(p->iir_mem, filter_signal + FRAME_LEN, LPC_ORDER * sizeof(int)); yading@10: yading@10: buf += LPC_ORDER; yading@10: signal_ptr = filter_signal + LPC_ORDER; yading@10: for (i = 0; i < SUBFRAMES; i++) { yading@10: int temp; yading@10: int auto_corr[2]; yading@10: int scale, energy; yading@10: yading@10: /* Normalize */ yading@10: scale = scale_vector(dst, buf, SUBFRAME_LEN); yading@10: yading@10: /* Compute auto correlation coefficients */ yading@10: auto_corr[0] = dot_product(dst, dst + 1, SUBFRAME_LEN - 1); yading@10: auto_corr[1] = dot_product(dst, dst, SUBFRAME_LEN); yading@10: yading@10: /* Compute reflection coefficient */ yading@10: temp = auto_corr[1] >> 16; yading@10: if (temp) { yading@10: temp = (auto_corr[0] >> 2) / temp; yading@10: } yading@10: p->reflection_coef = (3 * p->reflection_coef + temp + 2) >> 2; yading@10: temp = -p->reflection_coef >> 1 & ~3; yading@10: yading@10: /* Compensation filter */ yading@10: for (j = 0; j < SUBFRAME_LEN; j++) { yading@10: dst[j] = av_sat_dadd32(signal_ptr[j], yading@10: (signal_ptr[j - 1] >> 16) * temp) >> 16; yading@10: } yading@10: yading@10: /* Compute normalized signal energy */ yading@10: temp = 2 * scale + 4; yading@10: if (temp < 0) { yading@10: energy = av_clipl_int32((int64_t)auto_corr[1] << -temp); yading@10: } else yading@10: energy = auto_corr[1] >> temp; yading@10: yading@10: gain_scale(p, dst, energy); yading@10: yading@10: buf += SUBFRAME_LEN; yading@10: signal_ptr += SUBFRAME_LEN; yading@10: dst += SUBFRAME_LEN; yading@10: } yading@10: } yading@10: yading@10: static int sid_gain_to_lsp_index(int gain) yading@10: { yading@10: if (gain < 0x10) yading@10: return gain << 6; yading@10: else if (gain < 0x20) yading@10: return gain - 8 << 7; yading@10: else yading@10: return gain - 20 << 8; yading@10: } yading@10: yading@10: static inline int cng_rand(int *state, int base) yading@10: { yading@10: *state = (*state * 521 + 259) & 0xFFFF; yading@10: return (*state & 0x7FFF) * base >> 15; yading@10: } yading@10: yading@10: static int estimate_sid_gain(G723_1_Context *p) yading@10: { yading@10: int i, shift, seg, seg2, t, val, val_add, x, y; yading@10: yading@10: shift = 16 - p->cur_gain * 2; yading@10: if (shift > 0) yading@10: t = p->sid_gain << shift; yading@10: else yading@10: t = p->sid_gain >> -shift; yading@10: x = t * cng_filt[0] >> 16; yading@10: yading@10: if (x >= cng_bseg[2]) yading@10: return 0x3F; yading@10: yading@10: if (x >= cng_bseg[1]) { yading@10: shift = 4; yading@10: seg = 3; yading@10: } else { yading@10: shift = 3; yading@10: seg = (x >= cng_bseg[0]); yading@10: } yading@10: seg2 = FFMIN(seg, 3); yading@10: yading@10: val = 1 << shift; yading@10: val_add = val >> 1; yading@10: for (i = 0; i < shift; i++) { yading@10: t = seg * 32 + (val << seg2); yading@10: t *= t; yading@10: if (x >= t) yading@10: val += val_add; yading@10: else yading@10: val -= val_add; yading@10: val_add >>= 1; yading@10: } yading@10: yading@10: t = seg * 32 + (val << seg2); yading@10: y = t * t - x; yading@10: if (y <= 0) { yading@10: t = seg * 32 + (val + 1 << seg2); yading@10: t = t * t - x; yading@10: val = (seg2 - 1 << 4) + val; yading@10: if (t >= y) yading@10: val++; yading@10: } else { yading@10: t = seg * 32 + (val - 1 << seg2); yading@10: t = t * t - x; yading@10: val = (seg2 - 1 << 4) + val; yading@10: if (t >= y) yading@10: val--; yading@10: } yading@10: yading@10: return val; yading@10: } yading@10: yading@10: static void generate_noise(G723_1_Context *p) yading@10: { yading@10: int i, j, idx, t; yading@10: int off[SUBFRAMES]; yading@10: int signs[SUBFRAMES / 2 * 11], pos[SUBFRAMES / 2 * 11]; yading@10: int tmp[SUBFRAME_LEN * 2]; yading@10: int16_t *vector_ptr; yading@10: int64_t sum; yading@10: int b0, c, delta, x, shift; yading@10: yading@10: p->pitch_lag[0] = cng_rand(&p->cng_random_seed, 21) + 123; yading@10: p->pitch_lag[1] = cng_rand(&p->cng_random_seed, 19) + 123; yading@10: yading@10: for (i = 0; i < SUBFRAMES; i++) { yading@10: p->subframe[i].ad_cb_gain = cng_rand(&p->cng_random_seed, 50) + 1; yading@10: p->subframe[i].ad_cb_lag = cng_adaptive_cb_lag[i]; yading@10: } yading@10: yading@10: for (i = 0; i < SUBFRAMES / 2; i++) { yading@10: t = cng_rand(&p->cng_random_seed, 1 << 13); yading@10: off[i * 2] = t & 1; yading@10: off[i * 2 + 1] = ((t >> 1) & 1) + SUBFRAME_LEN; yading@10: t >>= 2; yading@10: for (j = 0; j < 11; j++) { yading@10: signs[i * 11 + j] = (t & 1) * 2 - 1 << 14; yading@10: t >>= 1; yading@10: } yading@10: } yading@10: yading@10: idx = 0; yading@10: for (i = 0; i < SUBFRAMES; i++) { yading@10: for (j = 0; j < SUBFRAME_LEN / 2; j++) yading@10: tmp[j] = j; yading@10: t = SUBFRAME_LEN / 2; yading@10: for (j = 0; j < pulses[i]; j++, idx++) { yading@10: int idx2 = cng_rand(&p->cng_random_seed, t); yading@10: yading@10: pos[idx] = tmp[idx2] * 2 + off[i]; yading@10: tmp[idx2] = tmp[--t]; yading@10: } yading@10: } yading@10: yading@10: vector_ptr = p->audio + LPC_ORDER; yading@10: memcpy(vector_ptr, p->prev_excitation, yading@10: PITCH_MAX * sizeof(*p->excitation)); yading@10: for (i = 0; i < SUBFRAMES; i += 2) { yading@10: gen_acb_excitation(vector_ptr, vector_ptr, yading@10: p->pitch_lag[i >> 1], &p->subframe[i], yading@10: p->cur_rate); yading@10: gen_acb_excitation(vector_ptr + SUBFRAME_LEN, yading@10: vector_ptr + SUBFRAME_LEN, yading@10: p->pitch_lag[i >> 1], &p->subframe[i + 1], yading@10: p->cur_rate); yading@10: yading@10: t = 0; yading@10: for (j = 0; j < SUBFRAME_LEN * 2; j++) yading@10: t |= FFABS(vector_ptr[j]); yading@10: t = FFMIN(t, 0x7FFF); yading@10: if (!t) { yading@10: shift = 0; yading@10: } else { yading@10: shift = -10 + av_log2(t); yading@10: if (shift < -2) yading@10: shift = -2; yading@10: } yading@10: sum = 0; yading@10: if (shift < 0) { yading@10: for (j = 0; j < SUBFRAME_LEN * 2; j++) { yading@10: t = vector_ptr[j] << -shift; yading@10: sum += t * t; yading@10: tmp[j] = t; yading@10: } yading@10: } else { yading@10: for (j = 0; j < SUBFRAME_LEN * 2; j++) { yading@10: t = vector_ptr[j] >> shift; yading@10: sum += t * t; yading@10: tmp[j] = t; yading@10: } yading@10: } yading@10: yading@10: b0 = 0; yading@10: for (j = 0; j < 11; j++) yading@10: b0 += tmp[pos[(i / 2) * 11 + j]] * signs[(i / 2) * 11 + j]; yading@10: b0 = b0 * 2 * 2979LL + (1 << 29) >> 30; // approximated division by 11 yading@10: yading@10: c = p->cur_gain * (p->cur_gain * SUBFRAME_LEN >> 5); yading@10: if (shift * 2 + 3 >= 0) yading@10: c >>= shift * 2 + 3; yading@10: else yading@10: c <<= -(shift * 2 + 3); yading@10: c = (av_clipl_int32(sum << 1) - c) * 2979LL >> 15; yading@10: yading@10: delta = b0 * b0 * 2 - c; yading@10: if (delta <= 0) { yading@10: x = -b0; yading@10: } else { yading@10: delta = square_root(delta); yading@10: x = delta - b0; yading@10: t = delta + b0; yading@10: if (FFABS(t) < FFABS(x)) yading@10: x = -t; yading@10: } yading@10: shift++; yading@10: if (shift < 0) yading@10: x >>= -shift; yading@10: else yading@10: x <<= shift; yading@10: x = av_clip(x, -10000, 10000); yading@10: yading@10: for (j = 0; j < 11; j++) { yading@10: idx = (i / 2) * 11 + j; yading@10: vector_ptr[pos[idx]] = av_clip_int16(vector_ptr[pos[idx]] + yading@10: (x * signs[idx] >> 15)); yading@10: } yading@10: yading@10: /* copy decoded data to serve as a history for the next decoded subframes */ yading@10: memcpy(vector_ptr + PITCH_MAX, vector_ptr, yading@10: sizeof(*vector_ptr) * SUBFRAME_LEN * 2); yading@10: vector_ptr += SUBFRAME_LEN * 2; yading@10: } yading@10: /* Save the excitation for the next frame */ yading@10: memcpy(p->prev_excitation, p->audio + LPC_ORDER + FRAME_LEN, yading@10: PITCH_MAX * sizeof(*p->excitation)); yading@10: } yading@10: yading@10: static int g723_1_decode_frame(AVCodecContext *avctx, void *data, yading@10: int *got_frame_ptr, AVPacket *avpkt) yading@10: { yading@10: G723_1_Context *p = avctx->priv_data; yading@10: AVFrame *frame = data; yading@10: const uint8_t *buf = avpkt->data; yading@10: int buf_size = avpkt->size; yading@10: int dec_mode = buf[0] & 3; yading@10: yading@10: PPFParam ppf[SUBFRAMES]; yading@10: int16_t cur_lsp[LPC_ORDER]; yading@10: int16_t lpc[SUBFRAMES * LPC_ORDER]; yading@10: int16_t acb_vector[SUBFRAME_LEN]; yading@10: int16_t *out; yading@10: int bad_frame = 0, i, j, ret; yading@10: int16_t *audio = p->audio; yading@10: yading@10: if (buf_size < frame_size[dec_mode]) { yading@10: if (buf_size) yading@10: av_log(avctx, AV_LOG_WARNING, yading@10: "Expected %d bytes, got %d - skipping packet\n", yading@10: frame_size[dec_mode], buf_size); yading@10: *got_frame_ptr = 0; yading@10: return buf_size; yading@10: } yading@10: yading@10: if (unpack_bitstream(p, buf, buf_size) < 0) { yading@10: bad_frame = 1; yading@10: if (p->past_frame_type == ACTIVE_FRAME) yading@10: p->cur_frame_type = ACTIVE_FRAME; yading@10: else yading@10: p->cur_frame_type = UNTRANSMITTED_FRAME; yading@10: } yading@10: yading@10: frame->nb_samples = FRAME_LEN; yading@10: if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) yading@10: return ret; yading@10: yading@10: out = (int16_t *)frame->data[0]; yading@10: yading@10: if (p->cur_frame_type == ACTIVE_FRAME) { yading@10: if (!bad_frame) yading@10: p->erased_frames = 0; yading@10: else if (p->erased_frames != 3) yading@10: p->erased_frames++; yading@10: yading@10: inverse_quant(cur_lsp, p->prev_lsp, p->lsp_index, bad_frame); yading@10: lsp_interpolate(lpc, cur_lsp, p->prev_lsp); yading@10: yading@10: /* Save the lsp_vector for the next frame */ yading@10: memcpy(p->prev_lsp, cur_lsp, LPC_ORDER * sizeof(*p->prev_lsp)); yading@10: yading@10: /* Generate the excitation for the frame */ yading@10: memcpy(p->excitation, p->prev_excitation, yading@10: PITCH_MAX * sizeof(*p->excitation)); yading@10: if (!p->erased_frames) { yading@10: int16_t *vector_ptr = p->excitation + PITCH_MAX; yading@10: yading@10: /* Update interpolation gain memory */ yading@10: p->interp_gain = fixed_cb_gain[(p->subframe[2].amp_index + yading@10: p->subframe[3].amp_index) >> 1]; yading@10: for (i = 0; i < SUBFRAMES; i++) { yading@10: gen_fcb_excitation(vector_ptr, &p->subframe[i], p->cur_rate, yading@10: p->pitch_lag[i >> 1], i); yading@10: gen_acb_excitation(acb_vector, &p->excitation[SUBFRAME_LEN * i], yading@10: p->pitch_lag[i >> 1], &p->subframe[i], yading@10: p->cur_rate); yading@10: /* Get the total excitation */ yading@10: for (j = 0; j < SUBFRAME_LEN; j++) { yading@10: int v = av_clip_int16(vector_ptr[j] << 1); yading@10: vector_ptr[j] = av_clip_int16(v + acb_vector[j]); yading@10: } yading@10: vector_ptr += SUBFRAME_LEN; yading@10: } yading@10: yading@10: vector_ptr = p->excitation + PITCH_MAX; yading@10: yading@10: p->interp_index = comp_interp_index(p, p->pitch_lag[1], yading@10: &p->sid_gain, &p->cur_gain); yading@10: yading@10: /* Peform pitch postfiltering */ yading@10: if (p->postfilter) { yading@10: i = PITCH_MAX; yading@10: for (j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) yading@10: comp_ppf_coeff(p, i, p->pitch_lag[j >> 1], yading@10: ppf + j, p->cur_rate); yading@10: yading@10: for (i = 0, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) yading@10: ff_acelp_weighted_vector_sum(p->audio + LPC_ORDER + i, yading@10: vector_ptr + i, yading@10: vector_ptr + i + ppf[j].index, yading@10: ppf[j].sc_gain, yading@10: ppf[j].opt_gain, yading@10: 1 << 14, 15, SUBFRAME_LEN); yading@10: } else { yading@10: audio = vector_ptr - LPC_ORDER; yading@10: } yading@10: yading@10: /* Save the excitation for the next frame */ yading@10: memcpy(p->prev_excitation, p->excitation + FRAME_LEN, yading@10: PITCH_MAX * sizeof(*p->excitation)); yading@10: } else { yading@10: p->interp_gain = (p->interp_gain * 3 + 2) >> 2; yading@10: if (p->erased_frames == 3) { yading@10: /* Mute output */ yading@10: memset(p->excitation, 0, yading@10: (FRAME_LEN + PITCH_MAX) * sizeof(*p->excitation)); yading@10: memset(p->prev_excitation, 0, yading@10: PITCH_MAX * sizeof(*p->excitation)); yading@10: memset(frame->data[0], 0, yading@10: (FRAME_LEN + LPC_ORDER) * sizeof(int16_t)); yading@10: } else { yading@10: int16_t *buf = p->audio + LPC_ORDER; yading@10: yading@10: /* Regenerate frame */ yading@10: residual_interp(p->excitation, buf, p->interp_index, yading@10: p->interp_gain, &p->random_seed); yading@10: yading@10: /* Save the excitation for the next frame */ yading@10: memcpy(p->prev_excitation, buf + (FRAME_LEN - PITCH_MAX), yading@10: PITCH_MAX * sizeof(*p->excitation)); yading@10: } yading@10: } yading@10: p->cng_random_seed = CNG_RANDOM_SEED; yading@10: } else { yading@10: if (p->cur_frame_type == SID_FRAME) { yading@10: p->sid_gain = sid_gain_to_lsp_index(p->subframe[0].amp_index); yading@10: inverse_quant(p->sid_lsp, p->prev_lsp, p->lsp_index, 0); yading@10: } else if (p->past_frame_type == ACTIVE_FRAME) { yading@10: p->sid_gain = estimate_sid_gain(p); yading@10: } yading@10: yading@10: if (p->past_frame_type == ACTIVE_FRAME) yading@10: p->cur_gain = p->sid_gain; yading@10: else yading@10: p->cur_gain = (p->cur_gain * 7 + p->sid_gain) >> 3; yading@10: generate_noise(p); yading@10: lsp_interpolate(lpc, p->sid_lsp, p->prev_lsp); yading@10: /* Save the lsp_vector for the next frame */ yading@10: memcpy(p->prev_lsp, p->sid_lsp, LPC_ORDER * sizeof(*p->prev_lsp)); yading@10: } yading@10: yading@10: p->past_frame_type = p->cur_frame_type; yading@10: yading@10: memcpy(p->audio, p->synth_mem, LPC_ORDER * sizeof(*p->audio)); yading@10: for (i = LPC_ORDER, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) yading@10: ff_celp_lp_synthesis_filter(p->audio + i, &lpc[j * LPC_ORDER], yading@10: audio + i, SUBFRAME_LEN, LPC_ORDER, yading@10: 0, 1, 1 << 12); yading@10: memcpy(p->synth_mem, p->audio + FRAME_LEN, LPC_ORDER * sizeof(*p->audio)); yading@10: yading@10: if (p->postfilter) { yading@10: formant_postfilter(p, lpc, p->audio, out); yading@10: } else { // if output is not postfiltered it should be scaled by 2 yading@10: for (i = 0; i < FRAME_LEN; i++) yading@10: out[i] = av_clip_int16(p->audio[LPC_ORDER + i] << 1); yading@10: } yading@10: yading@10: *got_frame_ptr = 1; yading@10: yading@10: return frame_size[dec_mode]; yading@10: } yading@10: yading@10: #define OFFSET(x) offsetof(G723_1_Context, x) yading@10: #define AD AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM yading@10: yading@10: static const AVOption options[] = { yading@10: { "postfilter", "postfilter on/off", OFFSET(postfilter), AV_OPT_TYPE_INT, yading@10: { .i64 = 1 }, 0, 1, AD }, yading@10: { NULL } yading@10: }; yading@10: yading@10: yading@10: static const AVClass g723_1dec_class = { yading@10: .class_name = "G.723.1 decoder", yading@10: .item_name = av_default_item_name, yading@10: .option = options, yading@10: .version = LIBAVUTIL_VERSION_INT, yading@10: }; yading@10: yading@10: AVCodec ff_g723_1_decoder = { yading@10: .name = "g723_1", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_G723_1, yading@10: .priv_data_size = sizeof(G723_1_Context), yading@10: .init = g723_1_decode_init, yading@10: .decode = g723_1_decode_frame, yading@10: .long_name = NULL_IF_CONFIG_SMALL("G.723.1"), yading@10: .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1, yading@10: .priv_class = &g723_1dec_class, yading@10: }; yading@10: yading@10: #if CONFIG_G723_1_ENCODER yading@10: #define BITSTREAM_WRITER_LE yading@10: #include "put_bits.h" yading@10: yading@10: static av_cold int g723_1_encode_init(AVCodecContext *avctx) yading@10: { yading@10: G723_1_Context *p = avctx->priv_data; yading@10: yading@10: if (avctx->sample_rate != 8000) { yading@10: av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); yading@10: return -1; yading@10: } yading@10: yading@10: if (avctx->channels != 1) { yading@10: av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: yading@10: if (avctx->bit_rate == 6300) { yading@10: p->cur_rate = RATE_6300; yading@10: } else if (avctx->bit_rate == 5300) { yading@10: av_log(avctx, AV_LOG_ERROR, "Bitrate not supported yet, use 6.3k\n"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } else { yading@10: av_log(avctx, AV_LOG_ERROR, yading@10: "Bitrate not supported, use 6.3k\n"); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: avctx->frame_size = 240; yading@10: memcpy(p->prev_lsp, dc_lsp, LPC_ORDER * sizeof(int16_t)); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: * Remove DC component from the input signal. yading@10: * yading@10: * @param buf input signal yading@10: * @param fir zero memory yading@10: * @param iir pole memory yading@10: */ yading@10: static void highpass_filter(int16_t *buf, int16_t *fir, int *iir) yading@10: { yading@10: int i; yading@10: for (i = 0; i < FRAME_LEN; i++) { yading@10: *iir = (buf[i] << 15) + ((-*fir) << 15) + MULL2(*iir, 0x7f00); yading@10: *fir = buf[i]; yading@10: buf[i] = av_clipl_int32((int64_t)*iir + (1 << 15)) >> 16; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Estimate autocorrelation of the input vector. yading@10: * yading@10: * @param buf input buffer yading@10: * @param autocorr autocorrelation coefficients vector yading@10: */ yading@10: static void comp_autocorr(int16_t *buf, int16_t *autocorr) yading@10: { yading@10: int i, scale, temp; yading@10: int16_t vector[LPC_FRAME]; yading@10: yading@10: scale_vector(vector, buf, LPC_FRAME); yading@10: yading@10: /* Apply the Hamming window */ yading@10: for (i = 0; i < LPC_FRAME; i++) yading@10: vector[i] = (vector[i] * hamming_window[i] + (1 << 14)) >> 15; yading@10: yading@10: /* Compute the first autocorrelation coefficient */ yading@10: temp = ff_dot_product(vector, vector, LPC_FRAME); yading@10: yading@10: /* Apply a white noise correlation factor of (1025/1024) */ yading@10: temp += temp >> 10; yading@10: yading@10: /* Normalize */ yading@10: scale = normalize_bits_int32(temp); yading@10: autocorr[0] = av_clipl_int32((int64_t)(temp << scale) + yading@10: (1 << 15)) >> 16; yading@10: yading@10: /* Compute the remaining coefficients */ yading@10: if (!autocorr[0]) { yading@10: memset(autocorr + 1, 0, LPC_ORDER * sizeof(int16_t)); yading@10: } else { yading@10: for (i = 1; i <= LPC_ORDER; i++) { yading@10: temp = ff_dot_product(vector, vector + i, LPC_FRAME - i); yading@10: temp = MULL2((temp << scale), binomial_window[i - 1]); yading@10: autocorr[i] = av_clipl_int32((int64_t)temp + (1 << 15)) >> 16; yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Use Levinson-Durbin recursion to compute LPC coefficients from yading@10: * autocorrelation values. yading@10: * yading@10: * @param lpc LPC coefficients vector yading@10: * @param autocorr autocorrelation coefficients vector yading@10: * @param error prediction error yading@10: */ yading@10: static void levinson_durbin(int16_t *lpc, int16_t *autocorr, int16_t error) yading@10: { yading@10: int16_t vector[LPC_ORDER]; yading@10: int16_t partial_corr; yading@10: int i, j, temp; yading@10: yading@10: memset(lpc, 0, LPC_ORDER * sizeof(int16_t)); yading@10: yading@10: for (i = 0; i < LPC_ORDER; i++) { yading@10: /* Compute the partial correlation coefficient */ yading@10: temp = 0; yading@10: for (j = 0; j < i; j++) yading@10: temp -= lpc[j] * autocorr[i - j - 1]; yading@10: temp = ((autocorr[i] << 13) + temp) << 3; yading@10: yading@10: if (FFABS(temp) >= (error << 16)) yading@10: break; yading@10: yading@10: partial_corr = temp / (error << 1); yading@10: yading@10: lpc[i] = av_clipl_int32((int64_t)(partial_corr << 14) + yading@10: (1 << 15)) >> 16; yading@10: yading@10: /* Update the prediction error */ yading@10: temp = MULL2(temp, partial_corr); yading@10: error = av_clipl_int32((int64_t)(error << 16) - temp + yading@10: (1 << 15)) >> 16; yading@10: yading@10: memcpy(vector, lpc, i * sizeof(int16_t)); yading@10: for (j = 0; j < i; j++) { yading@10: temp = partial_corr * vector[i - j - 1] << 1; yading@10: lpc[j] = av_clipl_int32((int64_t)(lpc[j] << 16) - temp + yading@10: (1 << 15)) >> 16; yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Calculate LPC coefficients for the current frame. yading@10: * yading@10: * @param buf current frame yading@10: * @param prev_data 2 trailing subframes of the previous frame yading@10: * @param lpc LPC coefficients vector yading@10: */ yading@10: static void comp_lpc_coeff(int16_t *buf, int16_t *lpc) yading@10: { yading@10: int16_t autocorr[(LPC_ORDER + 1) * SUBFRAMES]; yading@10: int16_t *autocorr_ptr = autocorr; yading@10: int16_t *lpc_ptr = lpc; yading@10: int i, j; yading@10: yading@10: for (i = 0, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) { yading@10: comp_autocorr(buf + i, autocorr_ptr); yading@10: levinson_durbin(lpc_ptr, autocorr_ptr + 1, autocorr_ptr[0]); yading@10: yading@10: lpc_ptr += LPC_ORDER; yading@10: autocorr_ptr += LPC_ORDER + 1; yading@10: } yading@10: } yading@10: yading@10: static void lpc2lsp(int16_t *lpc, int16_t *prev_lsp, int16_t *lsp) yading@10: { yading@10: int f[LPC_ORDER + 2]; ///< coefficients of the sum and difference yading@10: ///< polynomials (F1, F2) ordered as yading@10: ///< f1[0], f2[0], ...., f1[5], f2[5] yading@10: yading@10: int max, shift, cur_val, prev_val, count, p; yading@10: int i, j; yading@10: int64_t temp; yading@10: yading@10: /* Initialize f1[0] and f2[0] to 1 in Q25 */ yading@10: for (i = 0; i < LPC_ORDER; i++) yading@10: lsp[i] = (lpc[i] * bandwidth_expand[i] + (1 << 14)) >> 15; yading@10: yading@10: /* Apply bandwidth expansion on the LPC coefficients */ yading@10: f[0] = f[1] = 1 << 25; yading@10: yading@10: /* Compute the remaining coefficients */ yading@10: for (i = 0; i < LPC_ORDER / 2; i++) { yading@10: /* f1 */ yading@10: f[2 * i + 2] = -f[2 * i] - ((lsp[i] + lsp[LPC_ORDER - 1 - i]) << 12); yading@10: /* f2 */ yading@10: f[2 * i + 3] = f[2 * i + 1] - ((lsp[i] - lsp[LPC_ORDER - 1 - i]) << 12); yading@10: } yading@10: yading@10: /* Divide f1[5] and f2[5] by 2 for use in polynomial evaluation */ yading@10: f[LPC_ORDER] >>= 1; yading@10: f[LPC_ORDER + 1] >>= 1; yading@10: yading@10: /* Normalize and shorten */ yading@10: max = FFABS(f[0]); yading@10: for (i = 1; i < LPC_ORDER + 2; i++) yading@10: max = FFMAX(max, FFABS(f[i])); yading@10: yading@10: shift = normalize_bits_int32(max); yading@10: yading@10: for (i = 0; i < LPC_ORDER + 2; i++) yading@10: f[i] = av_clipl_int32((int64_t)(f[i] << shift) + (1 << 15)) >> 16; yading@10: yading@10: /** yading@10: * Evaluate F1 and F2 at uniform intervals of pi/256 along the yading@10: * unit circle and check for zero crossings. yading@10: */ yading@10: p = 0; yading@10: temp = 0; yading@10: for (i = 0; i <= LPC_ORDER / 2; i++) yading@10: temp += f[2 * i] * cos_tab[0]; yading@10: prev_val = av_clipl_int32(temp << 1); yading@10: count = 0; yading@10: for ( i = 1; i < COS_TBL_SIZE / 2; i++) { yading@10: /* Evaluate */ yading@10: temp = 0; yading@10: for (j = 0; j <= LPC_ORDER / 2; j++) yading@10: temp += f[LPC_ORDER - 2 * j + p] * cos_tab[i * j % COS_TBL_SIZE]; yading@10: cur_val = av_clipl_int32(temp << 1); yading@10: yading@10: /* Check for sign change, indicating a zero crossing */ yading@10: if ((cur_val ^ prev_val) < 0) { yading@10: int abs_cur = FFABS(cur_val); yading@10: int abs_prev = FFABS(prev_val); yading@10: int sum = abs_cur + abs_prev; yading@10: yading@10: shift = normalize_bits_int32(sum); yading@10: sum <<= shift; yading@10: abs_prev = abs_prev << shift >> 8; yading@10: lsp[count++] = ((i - 1) << 7) + (abs_prev >> 1) / (sum >> 16); yading@10: yading@10: if (count == LPC_ORDER) yading@10: break; yading@10: yading@10: /* Switch between sum and difference polynomials */ yading@10: p ^= 1; yading@10: yading@10: /* Evaluate */ yading@10: temp = 0; yading@10: for (j = 0; j <= LPC_ORDER / 2; j++){ yading@10: temp += f[LPC_ORDER - 2 * j + p] * yading@10: cos_tab[i * j % COS_TBL_SIZE]; yading@10: } yading@10: cur_val = av_clipl_int32(temp<<1); yading@10: } yading@10: prev_val = cur_val; yading@10: } yading@10: yading@10: if (count != LPC_ORDER) yading@10: memcpy(lsp, prev_lsp, LPC_ORDER * sizeof(int16_t)); yading@10: } yading@10: yading@10: /** yading@10: * Quantize the current LSP subvector. yading@10: * yading@10: * @param num band number yading@10: * @param offset offset of the current subvector in an LPC_ORDER vector yading@10: * @param size size of the current subvector yading@10: */ yading@10: #define get_index(num, offset, size) \ yading@10: {\ yading@10: int error, max = -1;\ yading@10: int16_t temp[4];\ yading@10: int i, j;\ yading@10: for (i = 0; i < LSP_CB_SIZE; i++) {\ yading@10: for (j = 0; j < size; j++){\ yading@10: temp[j] = (weight[j + (offset)] * lsp_band##num[i][j] +\ yading@10: (1 << 14)) >> 15;\ yading@10: }\ yading@10: error = dot_product(lsp + (offset), temp, size) << 1;\ yading@10: error -= dot_product(lsp_band##num[i], temp, size);\ yading@10: if (error > max) {\ yading@10: max = error;\ yading@10: lsp_index[num] = i;\ yading@10: }\ yading@10: }\ yading@10: } yading@10: yading@10: /** yading@10: * Vector quantize the LSP frequencies. yading@10: * yading@10: * @param lsp the current lsp vector yading@10: * @param prev_lsp the previous lsp vector yading@10: */ yading@10: static void lsp_quantize(uint8_t *lsp_index, int16_t *lsp, int16_t *prev_lsp) yading@10: { yading@10: int16_t weight[LPC_ORDER]; yading@10: int16_t min, max; yading@10: int shift, i; yading@10: yading@10: /* Calculate the VQ weighting vector */ yading@10: weight[0] = (1 << 20) / (lsp[1] - lsp[0]); yading@10: weight[LPC_ORDER - 1] = (1 << 20) / yading@10: (lsp[LPC_ORDER - 1] - lsp[LPC_ORDER - 2]); yading@10: yading@10: for (i = 1; i < LPC_ORDER - 1; i++) { yading@10: min = FFMIN(lsp[i] - lsp[i - 1], lsp[i + 1] - lsp[i]); yading@10: if (min > 0x20) yading@10: weight[i] = (1 << 20) / min; yading@10: else yading@10: weight[i] = INT16_MAX; yading@10: } yading@10: yading@10: /* Normalize */ yading@10: max = 0; yading@10: for (i = 0; i < LPC_ORDER; i++) yading@10: max = FFMAX(weight[i], max); yading@10: yading@10: shift = normalize_bits_int16(max); yading@10: for (i = 0; i < LPC_ORDER; i++) { yading@10: weight[i] <<= shift; yading@10: } yading@10: yading@10: /* Compute the VQ target vector */ yading@10: for (i = 0; i < LPC_ORDER; i++) { yading@10: lsp[i] -= dc_lsp[i] + yading@10: (((prev_lsp[i] - dc_lsp[i]) * 12288 + (1 << 14)) >> 15); yading@10: } yading@10: yading@10: get_index(0, 0, 3); yading@10: get_index(1, 3, 3); yading@10: get_index(2, 6, 4); yading@10: } yading@10: yading@10: /** yading@10: * Apply the formant perceptual weighting filter. yading@10: * yading@10: * @param flt_coef filter coefficients yading@10: * @param unq_lpc unquantized lpc vector yading@10: */ yading@10: static void perceptual_filter(G723_1_Context *p, int16_t *flt_coef, yading@10: int16_t *unq_lpc, int16_t *buf) yading@10: { yading@10: int16_t vector[FRAME_LEN + LPC_ORDER]; yading@10: int i, j, k, l = 0; yading@10: yading@10: memcpy(buf, p->iir_mem, sizeof(int16_t) * LPC_ORDER); yading@10: memcpy(vector, p->fir_mem, sizeof(int16_t) * LPC_ORDER); yading@10: memcpy(vector + LPC_ORDER, buf + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); yading@10: yading@10: for (i = LPC_ORDER, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) { yading@10: for (k = 0; k < LPC_ORDER; k++) { yading@10: flt_coef[k + 2 * l] = (unq_lpc[k + l] * percept_flt_tbl[0][k] + yading@10: (1 << 14)) >> 15; yading@10: flt_coef[k + 2 * l + LPC_ORDER] = (unq_lpc[k + l] * yading@10: percept_flt_tbl[1][k] + yading@10: (1 << 14)) >> 15; yading@10: } yading@10: iir_filter(flt_coef + 2 * l, flt_coef + 2 * l + LPC_ORDER, vector + i, yading@10: buf + i, 0); yading@10: l += LPC_ORDER; yading@10: } yading@10: memcpy(p->iir_mem, buf + FRAME_LEN, sizeof(int16_t) * LPC_ORDER); yading@10: memcpy(p->fir_mem, vector + FRAME_LEN, sizeof(int16_t) * LPC_ORDER); yading@10: } yading@10: yading@10: /** yading@10: * Estimate the open loop pitch period. yading@10: * yading@10: * @param buf perceptually weighted speech yading@10: * @param start estimation is carried out from this position yading@10: */ yading@10: static int estimate_pitch(int16_t *buf, int start) yading@10: { yading@10: int max_exp = 32; yading@10: int max_ccr = 0x4000; yading@10: int max_eng = 0x7fff; yading@10: int index = PITCH_MIN; yading@10: int offset = start - PITCH_MIN + 1; yading@10: yading@10: int ccr, eng, orig_eng, ccr_eng, exp; yading@10: int diff, temp; yading@10: yading@10: int i; yading@10: yading@10: orig_eng = ff_dot_product(buf + offset, buf + offset, HALF_FRAME_LEN); yading@10: yading@10: for (i = PITCH_MIN; i <= PITCH_MAX - 3; i++) { yading@10: offset--; yading@10: yading@10: /* Update energy and compute correlation */ yading@10: orig_eng += buf[offset] * buf[offset] - yading@10: buf[offset + HALF_FRAME_LEN] * buf[offset + HALF_FRAME_LEN]; yading@10: ccr = ff_dot_product(buf + start, buf + offset, HALF_FRAME_LEN); yading@10: if (ccr <= 0) yading@10: continue; yading@10: yading@10: /* Split into mantissa and exponent to maintain precision */ yading@10: exp = normalize_bits_int32(ccr); yading@10: ccr = av_clipl_int32((int64_t)(ccr << exp) + (1 << 15)) >> 16; yading@10: exp <<= 1; yading@10: ccr *= ccr; yading@10: temp = normalize_bits_int32(ccr); yading@10: ccr = ccr << temp >> 16; yading@10: exp += temp; yading@10: yading@10: temp = normalize_bits_int32(orig_eng); yading@10: eng = av_clipl_int32((int64_t)(orig_eng << temp) + (1 << 15)) >> 16; yading@10: exp -= temp; yading@10: yading@10: if (ccr >= eng) { yading@10: exp--; yading@10: ccr >>= 1; yading@10: } yading@10: if (exp > max_exp) yading@10: continue; yading@10: yading@10: if (exp + 1 < max_exp) yading@10: goto update; yading@10: yading@10: /* Equalize exponents before comparison */ yading@10: if (exp + 1 == max_exp) yading@10: temp = max_ccr >> 1; yading@10: else yading@10: temp = max_ccr; yading@10: ccr_eng = ccr * max_eng; yading@10: diff = ccr_eng - eng * temp; yading@10: if (diff > 0 && (i - index < PITCH_MIN || diff > ccr_eng >> 2)) { yading@10: update: yading@10: index = i; yading@10: max_exp = exp; yading@10: max_ccr = ccr; yading@10: max_eng = eng; yading@10: } yading@10: } yading@10: return index; yading@10: } yading@10: yading@10: /** yading@10: * Compute harmonic noise filter parameters. yading@10: * yading@10: * @param buf perceptually weighted speech yading@10: * @param pitch_lag open loop pitch period yading@10: * @param hf harmonic filter parameters yading@10: */ yading@10: static void comp_harmonic_coeff(int16_t *buf, int16_t pitch_lag, HFParam *hf) yading@10: { yading@10: int ccr, eng, max_ccr, max_eng; yading@10: int exp, max, diff; yading@10: int energy[15]; yading@10: int i, j; yading@10: yading@10: for (i = 0, j = pitch_lag - 3; j <= pitch_lag + 3; i++, j++) { yading@10: /* Compute residual energy */ yading@10: energy[i << 1] = ff_dot_product(buf - j, buf - j, SUBFRAME_LEN); yading@10: /* Compute correlation */ yading@10: energy[(i << 1) + 1] = ff_dot_product(buf, buf - j, SUBFRAME_LEN); yading@10: } yading@10: yading@10: /* Compute target energy */ yading@10: energy[14] = ff_dot_product(buf, buf, SUBFRAME_LEN); yading@10: yading@10: /* Normalize */ yading@10: max = 0; yading@10: for (i = 0; i < 15; i++) yading@10: max = FFMAX(max, FFABS(energy[i])); yading@10: yading@10: exp = normalize_bits_int32(max); yading@10: for (i = 0; i < 15; i++) { yading@10: energy[i] = av_clipl_int32((int64_t)(energy[i] << exp) + yading@10: (1 << 15)) >> 16; yading@10: } yading@10: yading@10: hf->index = -1; yading@10: hf->gain = 0; yading@10: max_ccr = 1; yading@10: max_eng = 0x7fff; yading@10: yading@10: for (i = 0; i <= 6; i++) { yading@10: eng = energy[i << 1]; yading@10: ccr = energy[(i << 1) + 1]; yading@10: yading@10: if (ccr <= 0) yading@10: continue; yading@10: yading@10: ccr = (ccr * ccr + (1 << 14)) >> 15; yading@10: diff = ccr * max_eng - eng * max_ccr; yading@10: if (diff > 0) { yading@10: max_ccr = ccr; yading@10: max_eng = eng; yading@10: hf->index = i; yading@10: } yading@10: } yading@10: yading@10: if (hf->index == -1) { yading@10: hf->index = pitch_lag; yading@10: return; yading@10: } yading@10: yading@10: eng = energy[14] * max_eng; yading@10: eng = (eng >> 2) + (eng >> 3); yading@10: ccr = energy[(hf->index << 1) + 1] * energy[(hf->index << 1) + 1]; yading@10: if (eng < ccr) { yading@10: eng = energy[(hf->index << 1) + 1]; yading@10: yading@10: if (eng >= max_eng) yading@10: hf->gain = 0x2800; yading@10: else yading@10: hf->gain = ((eng << 15) / max_eng * 0x2800 + (1 << 14)) >> 15; yading@10: } yading@10: hf->index += pitch_lag - 3; yading@10: } yading@10: yading@10: /** yading@10: * Apply the harmonic noise shaping filter. yading@10: * yading@10: * @param hf filter parameters yading@10: */ yading@10: static void harmonic_filter(HFParam *hf, const int16_t *src, int16_t *dest) yading@10: { yading@10: int i; yading@10: yading@10: for (i = 0; i < SUBFRAME_LEN; i++) { yading@10: int64_t temp = hf->gain * src[i - hf->index] << 1; yading@10: dest[i] = av_clipl_int32((src[i] << 16) - temp + (1 << 15)) >> 16; yading@10: } yading@10: } yading@10: yading@10: static void harmonic_noise_sub(HFParam *hf, const int16_t *src, int16_t *dest) yading@10: { yading@10: int i; yading@10: for (i = 0; i < SUBFRAME_LEN; i++) { yading@10: int64_t temp = hf->gain * src[i - hf->index] << 1; yading@10: dest[i] = av_clipl_int32(((dest[i] - src[i]) << 16) + temp + yading@10: (1 << 15)) >> 16; yading@10: yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Combined synthesis and formant perceptual weighting filer. yading@10: * yading@10: * @param qnt_lpc quantized lpc coefficients yading@10: * @param perf_lpc perceptual filter coefficients yading@10: * @param perf_fir perceptual filter fir memory yading@10: * @param perf_iir perceptual filter iir memory yading@10: * @param scale the filter output will be scaled by 2^scale yading@10: */ yading@10: static void synth_percept_filter(int16_t *qnt_lpc, int16_t *perf_lpc, yading@10: int16_t *perf_fir, int16_t *perf_iir, yading@10: const int16_t *src, int16_t *dest, int scale) yading@10: { yading@10: int i, j; yading@10: int16_t buf_16[SUBFRAME_LEN + LPC_ORDER]; yading@10: int64_t buf[SUBFRAME_LEN]; yading@10: yading@10: int16_t *bptr_16 = buf_16 + LPC_ORDER; yading@10: yading@10: memcpy(buf_16, perf_fir, sizeof(int16_t) * LPC_ORDER); yading@10: memcpy(dest - LPC_ORDER, perf_iir, sizeof(int16_t) * LPC_ORDER); yading@10: yading@10: for (i = 0; i < SUBFRAME_LEN; i++) { yading@10: int64_t temp = 0; yading@10: for (j = 1; j <= LPC_ORDER; j++) yading@10: temp -= qnt_lpc[j - 1] * bptr_16[i - j]; yading@10: yading@10: buf[i] = (src[i] << 15) + (temp << 3); yading@10: bptr_16[i] = av_clipl_int32(buf[i] + (1 << 15)) >> 16; yading@10: } yading@10: yading@10: for (i = 0; i < SUBFRAME_LEN; i++) { yading@10: int64_t fir = 0, iir = 0; yading@10: for (j = 1; j <= LPC_ORDER; j++) { yading@10: fir -= perf_lpc[j - 1] * bptr_16[i - j]; yading@10: iir += perf_lpc[j + LPC_ORDER - 1] * dest[i - j]; yading@10: } yading@10: dest[i] = av_clipl_int32(((buf[i] + (fir << 3)) << scale) + (iir << 3) + yading@10: (1 << 15)) >> 16; yading@10: } yading@10: memcpy(perf_fir, buf_16 + SUBFRAME_LEN, sizeof(int16_t) * LPC_ORDER); yading@10: memcpy(perf_iir, dest + SUBFRAME_LEN - LPC_ORDER, yading@10: sizeof(int16_t) * LPC_ORDER); yading@10: } yading@10: yading@10: /** yading@10: * Compute the adaptive codebook contribution. yading@10: * yading@10: * @param buf input signal yading@10: * @param index the current subframe index yading@10: */ yading@10: static void acb_search(G723_1_Context *p, int16_t *residual, yading@10: int16_t *impulse_resp, const int16_t *buf, yading@10: int index) yading@10: { yading@10: yading@10: int16_t flt_buf[PITCH_ORDER][SUBFRAME_LEN]; yading@10: yading@10: const int16_t *cb_tbl = adaptive_cb_gain85; yading@10: yading@10: int ccr_buf[PITCH_ORDER * SUBFRAMES << 2]; yading@10: yading@10: int pitch_lag = p->pitch_lag[index >> 1]; yading@10: int acb_lag = 1; yading@10: int acb_gain = 0; yading@10: int odd_frame = index & 1; yading@10: int iter = 3 + odd_frame; yading@10: int count = 0; yading@10: int tbl_size = 85; yading@10: yading@10: int i, j, k, l, max; yading@10: int64_t temp; yading@10: yading@10: if (!odd_frame) { yading@10: if (pitch_lag == PITCH_MIN) yading@10: pitch_lag++; yading@10: else yading@10: pitch_lag = FFMIN(pitch_lag, PITCH_MAX - 5); yading@10: } yading@10: yading@10: for (i = 0; i < iter; i++) { yading@10: get_residual(residual, p->prev_excitation, pitch_lag + i - 1); yading@10: yading@10: for (j = 0; j < SUBFRAME_LEN; j++) { yading@10: temp = 0; yading@10: for (k = 0; k <= j; k++) yading@10: temp += residual[PITCH_ORDER - 1 + k] * impulse_resp[j - k]; yading@10: flt_buf[PITCH_ORDER - 1][j] = av_clipl_int32((temp << 1) + yading@10: (1 << 15)) >> 16; yading@10: } yading@10: yading@10: for (j = PITCH_ORDER - 2; j >= 0; j--) { yading@10: flt_buf[j][0] = ((residual[j] << 13) + (1 << 14)) >> 15; yading@10: for (k = 1; k < SUBFRAME_LEN; k++) { yading@10: temp = (flt_buf[j + 1][k - 1] << 15) + yading@10: residual[j] * impulse_resp[k]; yading@10: flt_buf[j][k] = av_clipl_int32((temp << 1) + (1 << 15)) >> 16; yading@10: } yading@10: } yading@10: yading@10: /* Compute crosscorrelation with the signal */ yading@10: for (j = 0; j < PITCH_ORDER; j++) { yading@10: temp = ff_dot_product(buf, flt_buf[j], SUBFRAME_LEN); yading@10: ccr_buf[count++] = av_clipl_int32(temp << 1); yading@10: } yading@10: yading@10: /* Compute energies */ yading@10: for (j = 0; j < PITCH_ORDER; j++) { yading@10: ccr_buf[count++] = dot_product(flt_buf[j], flt_buf[j], yading@10: SUBFRAME_LEN); yading@10: } yading@10: yading@10: for (j = 1; j < PITCH_ORDER; j++) { yading@10: for (k = 0; k < j; k++) { yading@10: temp = ff_dot_product(flt_buf[j], flt_buf[k], SUBFRAME_LEN); yading@10: ccr_buf[count++] = av_clipl_int32(temp<<2); yading@10: } yading@10: } yading@10: } yading@10: yading@10: /* Normalize and shorten */ yading@10: max = 0; yading@10: for (i = 0; i < 20 * iter; i++) yading@10: max = FFMAX(max, FFABS(ccr_buf[i])); yading@10: yading@10: temp = normalize_bits_int32(max); yading@10: yading@10: for (i = 0; i < 20 * iter; i++){ yading@10: ccr_buf[i] = av_clipl_int32((int64_t)(ccr_buf[i] << temp) + yading@10: (1 << 15)) >> 16; yading@10: } yading@10: yading@10: max = 0; yading@10: for (i = 0; i < iter; i++) { yading@10: /* Select quantization table */ yading@10: if (!odd_frame && pitch_lag + i - 1 >= SUBFRAME_LEN - 2 || yading@10: odd_frame && pitch_lag >= SUBFRAME_LEN - 2) { yading@10: cb_tbl = adaptive_cb_gain170; yading@10: tbl_size = 170; yading@10: } yading@10: yading@10: for (j = 0, k = 0; j < tbl_size; j++, k += 20) { yading@10: temp = 0; yading@10: for (l = 0; l < 20; l++) yading@10: temp += ccr_buf[20 * i + l] * cb_tbl[k + l]; yading@10: temp = av_clipl_int32(temp); yading@10: yading@10: if (temp > max) { yading@10: max = temp; yading@10: acb_gain = j; yading@10: acb_lag = i; yading@10: } yading@10: } yading@10: } yading@10: yading@10: if (!odd_frame) { yading@10: pitch_lag += acb_lag - 1; yading@10: acb_lag = 1; yading@10: } yading@10: yading@10: p->pitch_lag[index >> 1] = pitch_lag; yading@10: p->subframe[index].ad_cb_lag = acb_lag; yading@10: p->subframe[index].ad_cb_gain = acb_gain; yading@10: } yading@10: yading@10: /** yading@10: * Subtract the adaptive codebook contribution from the input yading@10: * to obtain the residual. yading@10: * yading@10: * @param buf target vector yading@10: */ yading@10: static void sub_acb_contrib(const int16_t *residual, const int16_t *impulse_resp, yading@10: int16_t *buf) yading@10: { yading@10: int i, j; yading@10: /* Subtract adaptive CB contribution to obtain the residual */ yading@10: for (i = 0; i < SUBFRAME_LEN; i++) { yading@10: int64_t temp = buf[i] << 14; yading@10: for (j = 0; j <= i; j++) yading@10: temp -= residual[j] * impulse_resp[i - j]; yading@10: yading@10: buf[i] = av_clipl_int32((temp << 2) + (1 << 15)) >> 16; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Quantize the residual signal using the fixed codebook (MP-MLQ). yading@10: * yading@10: * @param optim optimized fixed codebook parameters yading@10: * @param buf excitation vector yading@10: */ yading@10: static void get_fcb_param(FCBParam *optim, int16_t *impulse_resp, yading@10: int16_t *buf, int pulse_cnt, int pitch_lag) yading@10: { yading@10: FCBParam param; yading@10: int16_t impulse_r[SUBFRAME_LEN]; yading@10: int16_t temp_corr[SUBFRAME_LEN]; yading@10: int16_t impulse_corr[SUBFRAME_LEN]; yading@10: yading@10: int ccr1[SUBFRAME_LEN]; yading@10: int ccr2[SUBFRAME_LEN]; yading@10: int amp, err, max, max_amp_index, min, scale, i, j, k, l; yading@10: yading@10: int64_t temp; yading@10: yading@10: /* Update impulse response */ yading@10: memcpy(impulse_r, impulse_resp, sizeof(int16_t) * SUBFRAME_LEN); yading@10: param.dirac_train = 0; yading@10: if (pitch_lag < SUBFRAME_LEN - 2) { yading@10: param.dirac_train = 1; yading@10: gen_dirac_train(impulse_r, pitch_lag); yading@10: } yading@10: yading@10: for (i = 0; i < SUBFRAME_LEN; i++) yading@10: temp_corr[i] = impulse_r[i] >> 1; yading@10: yading@10: /* Compute impulse response autocorrelation */ yading@10: temp = dot_product(temp_corr, temp_corr, SUBFRAME_LEN); yading@10: yading@10: scale = normalize_bits_int32(temp); yading@10: impulse_corr[0] = av_clipl_int32((temp << scale) + (1 << 15)) >> 16; yading@10: yading@10: for (i = 1; i < SUBFRAME_LEN; i++) { yading@10: temp = dot_product(temp_corr + i, temp_corr, SUBFRAME_LEN - i); yading@10: impulse_corr[i] = av_clipl_int32((temp << scale) + (1 << 15)) >> 16; yading@10: } yading@10: yading@10: /* Compute crosscorrelation of impulse response with residual signal */ yading@10: scale -= 4; yading@10: for (i = 0; i < SUBFRAME_LEN; i++){ yading@10: temp = dot_product(buf + i, impulse_r, SUBFRAME_LEN - i); yading@10: if (scale < 0) yading@10: ccr1[i] = temp >> -scale; yading@10: else yading@10: ccr1[i] = av_clipl_int32(temp << scale); yading@10: } yading@10: yading@10: /* Search loop */ yading@10: for (i = 0; i < GRID_SIZE; i++) { yading@10: /* Maximize the crosscorrelation */ yading@10: max = 0; yading@10: for (j = i; j < SUBFRAME_LEN; j += GRID_SIZE) { yading@10: temp = FFABS(ccr1[j]); yading@10: if (temp >= max) { yading@10: max = temp; yading@10: param.pulse_pos[0] = j; yading@10: } yading@10: } yading@10: yading@10: /* Quantize the gain (max crosscorrelation/impulse_corr[0]) */ yading@10: amp = max; yading@10: min = 1 << 30; yading@10: max_amp_index = GAIN_LEVELS - 2; yading@10: for (j = max_amp_index; j >= 2; j--) { yading@10: temp = av_clipl_int32((int64_t)fixed_cb_gain[j] * yading@10: impulse_corr[0] << 1); yading@10: temp = FFABS(temp - amp); yading@10: if (temp < min) { yading@10: min = temp; yading@10: max_amp_index = j; yading@10: } yading@10: } yading@10: yading@10: max_amp_index--; yading@10: /* Select additional gain values */ yading@10: for (j = 1; j < 5; j++) { yading@10: for (k = i; k < SUBFRAME_LEN; k += GRID_SIZE) { yading@10: temp_corr[k] = 0; yading@10: ccr2[k] = ccr1[k]; yading@10: } yading@10: param.amp_index = max_amp_index + j - 2; yading@10: amp = fixed_cb_gain[param.amp_index]; yading@10: yading@10: param.pulse_sign[0] = (ccr2[param.pulse_pos[0]] < 0) ? -amp : amp; yading@10: temp_corr[param.pulse_pos[0]] = 1; yading@10: yading@10: for (k = 1; k < pulse_cnt; k++) { yading@10: max = -1 << 30; yading@10: for (l = i; l < SUBFRAME_LEN; l += GRID_SIZE) { yading@10: if (temp_corr[l]) yading@10: continue; yading@10: temp = impulse_corr[FFABS(l - param.pulse_pos[k - 1])]; yading@10: temp = av_clipl_int32((int64_t)temp * yading@10: param.pulse_sign[k - 1] << 1); yading@10: ccr2[l] -= temp; yading@10: temp = FFABS(ccr2[l]); yading@10: if (temp > max) { yading@10: max = temp; yading@10: param.pulse_pos[k] = l; yading@10: } yading@10: } yading@10: yading@10: param.pulse_sign[k] = (ccr2[param.pulse_pos[k]] < 0) ? yading@10: -amp : amp; yading@10: temp_corr[param.pulse_pos[k]] = 1; yading@10: } yading@10: yading@10: /* Create the error vector */ yading@10: memset(temp_corr, 0, sizeof(int16_t) * SUBFRAME_LEN); yading@10: yading@10: for (k = 0; k < pulse_cnt; k++) yading@10: temp_corr[param.pulse_pos[k]] = param.pulse_sign[k]; yading@10: yading@10: for (k = SUBFRAME_LEN - 1; k >= 0; k--) { yading@10: temp = 0; yading@10: for (l = 0; l <= k; l++) { yading@10: int prod = av_clipl_int32((int64_t)temp_corr[l] * yading@10: impulse_r[k - l] << 1); yading@10: temp = av_clipl_int32(temp + prod); yading@10: } yading@10: temp_corr[k] = temp << 2 >> 16; yading@10: } yading@10: yading@10: /* Compute square of error */ yading@10: err = 0; yading@10: for (k = 0; k < SUBFRAME_LEN; k++) { yading@10: int64_t prod; yading@10: prod = av_clipl_int32((int64_t)buf[k] * temp_corr[k] << 1); yading@10: err = av_clipl_int32(err - prod); yading@10: prod = av_clipl_int32((int64_t)temp_corr[k] * temp_corr[k]); yading@10: err = av_clipl_int32(err + prod); yading@10: } yading@10: yading@10: /* Minimize */ yading@10: if (err < optim->min_err) { yading@10: optim->min_err = err; yading@10: optim->grid_index = i; yading@10: optim->amp_index = param.amp_index; yading@10: optim->dirac_train = param.dirac_train; yading@10: yading@10: for (k = 0; k < pulse_cnt; k++) { yading@10: optim->pulse_sign[k] = param.pulse_sign[k]; yading@10: optim->pulse_pos[k] = param.pulse_pos[k]; yading@10: } yading@10: } yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Encode the pulse position and gain of the current subframe. yading@10: * yading@10: * @param optim optimized fixed CB parameters yading@10: * @param buf excitation vector yading@10: */ yading@10: static void pack_fcb_param(G723_1_Subframe *subfrm, FCBParam *optim, yading@10: int16_t *buf, int pulse_cnt) yading@10: { yading@10: int i, j; yading@10: yading@10: j = PULSE_MAX - pulse_cnt; yading@10: yading@10: subfrm->pulse_sign = 0; yading@10: subfrm->pulse_pos = 0; yading@10: yading@10: for (i = 0; i < SUBFRAME_LEN >> 1; i++) { yading@10: int val = buf[optim->grid_index + (i << 1)]; yading@10: if (!val) { yading@10: subfrm->pulse_pos += combinatorial_table[j][i]; yading@10: } else { yading@10: subfrm->pulse_sign <<= 1; yading@10: if (val < 0) subfrm->pulse_sign++; yading@10: j++; yading@10: yading@10: if (j == PULSE_MAX) break; yading@10: } yading@10: } yading@10: subfrm->amp_index = optim->amp_index; yading@10: subfrm->grid_index = optim->grid_index; yading@10: subfrm->dirac_train = optim->dirac_train; yading@10: } yading@10: yading@10: /** yading@10: * Compute the fixed codebook excitation. yading@10: * yading@10: * @param buf target vector yading@10: * @param impulse_resp impulse response of the combined filter yading@10: */ yading@10: static void fcb_search(G723_1_Context *p, int16_t *impulse_resp, yading@10: int16_t *buf, int index) yading@10: { yading@10: FCBParam optim; yading@10: int pulse_cnt = pulses[index]; yading@10: int i; yading@10: yading@10: optim.min_err = 1 << 30; yading@10: get_fcb_param(&optim, impulse_resp, buf, pulse_cnt, SUBFRAME_LEN); yading@10: yading@10: if (p->pitch_lag[index >> 1] < SUBFRAME_LEN - 2) { yading@10: get_fcb_param(&optim, impulse_resp, buf, pulse_cnt, yading@10: p->pitch_lag[index >> 1]); yading@10: } yading@10: yading@10: /* Reconstruct the excitation */ yading@10: memset(buf, 0, sizeof(int16_t) * SUBFRAME_LEN); yading@10: for (i = 0; i < pulse_cnt; i++) yading@10: buf[optim.pulse_pos[i]] = optim.pulse_sign[i]; yading@10: yading@10: pack_fcb_param(&p->subframe[index], &optim, buf, pulse_cnt); yading@10: yading@10: if (optim.dirac_train) yading@10: gen_dirac_train(buf, p->pitch_lag[index >> 1]); yading@10: } yading@10: yading@10: /** yading@10: * Pack the frame parameters into output bitstream. yading@10: * yading@10: * @param frame output buffer yading@10: * @param size size of the buffer yading@10: */ yading@10: static int pack_bitstream(G723_1_Context *p, unsigned char *frame, int size) yading@10: { yading@10: PutBitContext pb; yading@10: int info_bits, i, temp; yading@10: yading@10: init_put_bits(&pb, frame, size); yading@10: yading@10: if (p->cur_rate == RATE_6300) { yading@10: info_bits = 0; yading@10: put_bits(&pb, 2, info_bits); yading@10: } yading@10: yading@10: put_bits(&pb, 8, p->lsp_index[2]); yading@10: put_bits(&pb, 8, p->lsp_index[1]); yading@10: put_bits(&pb, 8, p->lsp_index[0]); yading@10: yading@10: put_bits(&pb, 7, p->pitch_lag[0] - PITCH_MIN); yading@10: put_bits(&pb, 2, p->subframe[1].ad_cb_lag); yading@10: put_bits(&pb, 7, p->pitch_lag[1] - PITCH_MIN); yading@10: put_bits(&pb, 2, p->subframe[3].ad_cb_lag); yading@10: yading@10: /* Write 12 bit combined gain */ yading@10: for (i = 0; i < SUBFRAMES; i++) { yading@10: temp = p->subframe[i].ad_cb_gain * GAIN_LEVELS + yading@10: p->subframe[i].amp_index; yading@10: if (p->cur_rate == RATE_6300) yading@10: temp += p->subframe[i].dirac_train << 11; yading@10: put_bits(&pb, 12, temp); yading@10: } yading@10: yading@10: put_bits(&pb, 1, p->subframe[0].grid_index); yading@10: put_bits(&pb, 1, p->subframe[1].grid_index); yading@10: put_bits(&pb, 1, p->subframe[2].grid_index); yading@10: put_bits(&pb, 1, p->subframe[3].grid_index); yading@10: yading@10: if (p->cur_rate == RATE_6300) { yading@10: skip_put_bits(&pb, 1); /* reserved bit */ yading@10: yading@10: /* Write 13 bit combined position index */ yading@10: temp = (p->subframe[0].pulse_pos >> 16) * 810 + yading@10: (p->subframe[1].pulse_pos >> 14) * 90 + yading@10: (p->subframe[2].pulse_pos >> 16) * 9 + yading@10: (p->subframe[3].pulse_pos >> 14); yading@10: put_bits(&pb, 13, temp); yading@10: yading@10: put_bits(&pb, 16, p->subframe[0].pulse_pos & 0xffff); yading@10: put_bits(&pb, 14, p->subframe[1].pulse_pos & 0x3fff); yading@10: put_bits(&pb, 16, p->subframe[2].pulse_pos & 0xffff); yading@10: put_bits(&pb, 14, p->subframe[3].pulse_pos & 0x3fff); yading@10: yading@10: put_bits(&pb, 6, p->subframe[0].pulse_sign); yading@10: put_bits(&pb, 5, p->subframe[1].pulse_sign); yading@10: put_bits(&pb, 6, p->subframe[2].pulse_sign); yading@10: put_bits(&pb, 5, p->subframe[3].pulse_sign); yading@10: } yading@10: yading@10: flush_put_bits(&pb); yading@10: return frame_size[info_bits]; yading@10: } yading@10: yading@10: static int g723_1_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, yading@10: const AVFrame *frame, int *got_packet_ptr) yading@10: { yading@10: G723_1_Context *p = avctx->priv_data; yading@10: int16_t unq_lpc[LPC_ORDER * SUBFRAMES]; yading@10: int16_t qnt_lpc[LPC_ORDER * SUBFRAMES]; yading@10: int16_t cur_lsp[LPC_ORDER]; yading@10: int16_t weighted_lpc[LPC_ORDER * SUBFRAMES << 1]; yading@10: int16_t vector[FRAME_LEN + PITCH_MAX]; yading@10: int offset, ret; yading@10: int16_t *in = (const int16_t *)frame->data[0]; yading@10: yading@10: HFParam hf[4]; yading@10: int i, j; yading@10: yading@10: highpass_filter(in, &p->hpf_fir_mem, &p->hpf_iir_mem); yading@10: yading@10: memcpy(vector, p->prev_data, HALF_FRAME_LEN * sizeof(int16_t)); yading@10: memcpy(vector + HALF_FRAME_LEN, in, FRAME_LEN * sizeof(int16_t)); yading@10: yading@10: comp_lpc_coeff(vector, unq_lpc); yading@10: lpc2lsp(&unq_lpc[LPC_ORDER * 3], p->prev_lsp, cur_lsp); yading@10: lsp_quantize(p->lsp_index, cur_lsp, p->prev_lsp); yading@10: yading@10: /* Update memory */ yading@10: memcpy(vector + LPC_ORDER, p->prev_data + SUBFRAME_LEN, yading@10: sizeof(int16_t) * SUBFRAME_LEN); yading@10: memcpy(vector + LPC_ORDER + SUBFRAME_LEN, in, yading@10: sizeof(int16_t) * (HALF_FRAME_LEN + SUBFRAME_LEN)); yading@10: memcpy(p->prev_data, in + HALF_FRAME_LEN, yading@10: sizeof(int16_t) * HALF_FRAME_LEN); yading@10: memcpy(in, vector + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); yading@10: yading@10: perceptual_filter(p, weighted_lpc, unq_lpc, vector); yading@10: yading@10: memcpy(in, vector + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); yading@10: memcpy(vector, p->prev_weight_sig, sizeof(int16_t) * PITCH_MAX); yading@10: memcpy(vector + PITCH_MAX, in, sizeof(int16_t) * FRAME_LEN); yading@10: yading@10: scale_vector(vector, vector, FRAME_LEN + PITCH_MAX); yading@10: yading@10: p->pitch_lag[0] = estimate_pitch(vector, PITCH_MAX); yading@10: p->pitch_lag[1] = estimate_pitch(vector, PITCH_MAX + HALF_FRAME_LEN); yading@10: yading@10: for (i = PITCH_MAX, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) yading@10: comp_harmonic_coeff(vector + i, p->pitch_lag[j >> 1], hf + j); yading@10: yading@10: memcpy(vector, p->prev_weight_sig, sizeof(int16_t) * PITCH_MAX); yading@10: memcpy(vector + PITCH_MAX, in, sizeof(int16_t) * FRAME_LEN); yading@10: memcpy(p->prev_weight_sig, vector + FRAME_LEN, sizeof(int16_t) * PITCH_MAX); yading@10: yading@10: for (i = 0, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) yading@10: harmonic_filter(hf + j, vector + PITCH_MAX + i, in + i); yading@10: yading@10: inverse_quant(cur_lsp, p->prev_lsp, p->lsp_index, 0); yading@10: lsp_interpolate(qnt_lpc, cur_lsp, p->prev_lsp); yading@10: yading@10: memcpy(p->prev_lsp, cur_lsp, sizeof(int16_t) * LPC_ORDER); yading@10: yading@10: offset = 0; yading@10: for (i = 0; i < SUBFRAMES; i++) { yading@10: int16_t impulse_resp[SUBFRAME_LEN]; yading@10: int16_t residual[SUBFRAME_LEN + PITCH_ORDER - 1]; yading@10: int16_t flt_in[SUBFRAME_LEN]; yading@10: int16_t zero[LPC_ORDER], fir[LPC_ORDER], iir[LPC_ORDER]; yading@10: yading@10: /** yading@10: * Compute the combined impulse response of the synthesis filter, yading@10: * formant perceptual weighting filter and harmonic noise shaping filter yading@10: */ yading@10: memset(zero, 0, sizeof(int16_t) * LPC_ORDER); yading@10: memset(vector, 0, sizeof(int16_t) * PITCH_MAX); yading@10: memset(flt_in, 0, sizeof(int16_t) * SUBFRAME_LEN); yading@10: yading@10: flt_in[0] = 1 << 13; /* Unit impulse */ yading@10: synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), yading@10: zero, zero, flt_in, vector + PITCH_MAX, 1); yading@10: harmonic_filter(hf + i, vector + PITCH_MAX, impulse_resp); yading@10: yading@10: /* Compute the combined zero input response */ yading@10: flt_in[0] = 0; yading@10: memcpy(fir, p->perf_fir_mem, sizeof(int16_t) * LPC_ORDER); yading@10: memcpy(iir, p->perf_iir_mem, sizeof(int16_t) * LPC_ORDER); yading@10: yading@10: synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), yading@10: fir, iir, flt_in, vector + PITCH_MAX, 0); yading@10: memcpy(vector, p->harmonic_mem, sizeof(int16_t) * PITCH_MAX); yading@10: harmonic_noise_sub(hf + i, vector + PITCH_MAX, in); yading@10: yading@10: acb_search(p, residual, impulse_resp, in, i); yading@10: gen_acb_excitation(residual, p->prev_excitation,p->pitch_lag[i >> 1], yading@10: &p->subframe[i], p->cur_rate); yading@10: sub_acb_contrib(residual, impulse_resp, in); yading@10: yading@10: fcb_search(p, impulse_resp, in, i); yading@10: yading@10: /* Reconstruct the excitation */ yading@10: gen_acb_excitation(impulse_resp, p->prev_excitation, p->pitch_lag[i >> 1], yading@10: &p->subframe[i], RATE_6300); yading@10: yading@10: memmove(p->prev_excitation, p->prev_excitation + SUBFRAME_LEN, yading@10: sizeof(int16_t) * (PITCH_MAX - SUBFRAME_LEN)); yading@10: for (j = 0; j < SUBFRAME_LEN; j++) yading@10: in[j] = av_clip_int16((in[j] << 1) + impulse_resp[j]); yading@10: memcpy(p->prev_excitation + PITCH_MAX - SUBFRAME_LEN, in, yading@10: sizeof(int16_t) * SUBFRAME_LEN); yading@10: yading@10: /* Update filter memories */ yading@10: synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), yading@10: p->perf_fir_mem, p->perf_iir_mem, yading@10: in, vector + PITCH_MAX, 0); yading@10: memmove(p->harmonic_mem, p->harmonic_mem + SUBFRAME_LEN, yading@10: sizeof(int16_t) * (PITCH_MAX - SUBFRAME_LEN)); yading@10: memcpy(p->harmonic_mem + PITCH_MAX - SUBFRAME_LEN, vector + PITCH_MAX, yading@10: sizeof(int16_t) * SUBFRAME_LEN); yading@10: yading@10: in += SUBFRAME_LEN; yading@10: offset += LPC_ORDER; yading@10: } yading@10: yading@10: if ((ret = ff_alloc_packet2(avctx, avpkt, 24)) < 0) yading@10: return ret; yading@10: yading@10: *got_packet_ptr = 1; yading@10: avpkt->size = pack_bitstream(p, avpkt->data, avpkt->size); yading@10: return 0; yading@10: } yading@10: yading@10: AVCodec ff_g723_1_encoder = { yading@10: .name = "g723_1", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_G723_1, yading@10: .priv_data_size = sizeof(G723_1_Context), yading@10: .init = g723_1_encode_init, yading@10: .encode2 = g723_1_encode_frame, yading@10: .long_name = NULL_IF_CONFIG_SMALL("G.723.1"), yading@10: .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16, yading@10: AV_SAMPLE_FMT_NONE}, yading@10: }; yading@10: #endif