diff --git a/doc/general.texi b/doc/general.texi index a10b7567f9..32c180cf3b 100644 --- a/doc/general.texi +++ b/doc/general.texi @@ -984,7 +984,7 @@ following image formats are supported: @item Enhanced AC-3 @tab X @tab X @item EVRC (Enhanced Variable Rate Codec) @tab @tab X @item FLAC (Free Lossless Audio Codec) @tab X @tab IX -@item G.723.1 @tab X @tab X +@item G.723.1 @tab X @tab X @item G.729 @tab @tab X @item GSM @tab E @tab X @tab encoding supported through external library libgsm diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 4b95e16058..1ad3787eb0 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -276,9 +276,10 @@ OBJS-$(CONFIG_FOURXM_DECODER) += 4xm.o OBJS-$(CONFIG_FRAPS_DECODER) += fraps.o OBJS-$(CONFIG_FRWU_DECODER) += frwu.o OBJS-$(CONFIG_G2M_DECODER) += g2meet.o elsdec.o -OBJS-$(CONFIG_G723_1_DECODER) += g723_1dec.o g723_1.o acelp_vectors.o \ - celp_filters.o celp_math.o -OBJS-$(CONFIG_G723_1_ENCODER) += g723_1dec.o g723_1.o acelp_vectors.o celp_math.o +OBJS-$(CONFIG_G723_1_DECODER) += g723_1dec.o g723_1.o \ + acelp_vectors.o celp_filters.o celp_math.o +OBJS-$(CONFIG_G723_1_ENCODER) += g723_1enc.o g723_1.o \ + acelp_vectors.o celp_filters.o OBJS-$(CONFIG_G729_DECODER) += g729dec.o lsp.o celp_math.o acelp_filters.o acelp_pitch_delay.o acelp_vectors.o g729postfilter.o OBJS-$(CONFIG_GIF_DECODER) += gifdec.o lzw.o OBJS-$(CONFIG_GIF_ENCODER) += gif.o lzwenc.o diff --git a/libavcodec/celp_math.h b/libavcodec/celp_math.h index 18d3ad94d1..18888a425d 100644 --- a/libavcodec/celp_math.h +++ b/libavcodec/celp_math.h @@ -61,6 +61,16 @@ int ff_exp2(uint16_t power); */ int ff_log2_q15(uint32_t value); +/** + * Calculate the dot product of 2 int16_t vectors. + * @param a input data array + * @param b input data array + * @param length number of elements + * + * @return dot product = sum of elementwise products + */ +int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length); + /** * Shift value left or right depending on sign of offset parameter. * @param value value to shift @@ -74,16 +84,6 @@ static inline int bidir_sal(int value, int offset) else return value << offset; } -/** - * returns the dot product of 2 int16_t vectors. - * @param a input data array - * @param b input data array - * @param length number of elements - * - * @return dot product = sum of elementwise products - */ -int64_t ff_dot_product(const int16_t *a, const int16_t *b, int length); - /** * Return the dot product. * @param a input data array diff --git a/libavcodec/g723_1.c b/libavcodec/g723_1.c index 71f3514a02..a11fec8a9e 100644 --- a/libavcodec/g723_1.c +++ b/libavcodec/g723_1.c @@ -53,7 +53,7 @@ int ff_g723_1_normalize_bits(int num, int width) int ff_g723_1_dot_product(const int16_t *a, const int16_t *b, int length) { - int sum = ff_dot_product(a,b,length); + int sum = ff_dot_product(a, b, length); return av_sat_add32(sum, sum); } diff --git a/libavcodec/g723_1.h b/libavcodec/g723_1.h index d8c904712c..cf982a331c 100644 --- a/libavcodec/g723_1.h +++ b/libavcodec/g723_1.h @@ -145,10 +145,11 @@ typedef struct g723_1_context { int postfilter; int16_t audio[FRAME_LEN + LPC_ORDER + PITCH_MAX + 4]; + + /* encoder */ int16_t prev_data[HALF_FRAME_LEN]; int16_t prev_weight_sig[PITCH_MAX]; - int16_t hpf_fir_mem; ///< highpass filter fir int hpf_iir_mem; ///< and iir memories int16_t perf_fir_mem[LPC_ORDER]; ///< perceptual filter fir diff --git a/libavcodec/g723_1dec.c b/libavcodec/g723_1dec.c index 47d22b54bc..3e8c4897d2 100644 --- a/libavcodec/g723_1dec.c +++ b/libavcodec/g723_1dec.c @@ -186,9 +186,6 @@ static int16_t square_root(unsigned val) return (ff_sqrt(val << 1) >> 1) & (~1); } -#define normalize_bits_int16(num) ff_g723_1_normalize_bits(num, 15) -#define normalize_bits_int32(num) ff_g723_1_normalize_bits(num, 31) - /** * Generate fixed codebook excitation vector. * @@ -1028,1145 +1025,3 @@ AVCodec ff_g723_1_decoder = { .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1, .priv_class = &g723_1dec_class, }; - -#if CONFIG_G723_1_ENCODER -#define BITSTREAM_WRITER_LE -#include "put_bits.h" - -static av_cold int g723_1_encode_init(AVCodecContext *avctx) -{ - G723_1_Context *p = avctx->priv_data; - - if (avctx->sample_rate != 8000) { - av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); - return -1; - } - - if (avctx->channels != 1) { - av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); - return AVERROR(EINVAL); - } - - if (avctx->bit_rate == 6300) { - p->cur_rate = RATE_6300; - } else if (avctx->bit_rate == 5300) { - av_log(avctx, AV_LOG_ERROR, "Bitrate not supported yet, use 6.3k\n"); - return AVERROR_PATCHWELCOME; - } else { - av_log(avctx, AV_LOG_ERROR, - "Bitrate not supported, use 6.3k\n"); - return AVERROR(EINVAL); - } - avctx->frame_size = 240; - memcpy(p->prev_lsp, dc_lsp, LPC_ORDER * sizeof(int16_t)); - - return 0; -} - -/** - * Remove DC component from the input signal. - * - * @param buf input signal - * @param fir zero memory - * @param iir pole memory - */ -static void highpass_filter(int16_t *buf, int16_t *fir, int *iir) -{ - int i; - for (i = 0; i < FRAME_LEN; i++) { - *iir = (buf[i] << 15) + ((-*fir) << 15) + MULL2(*iir, 0x7f00); - *fir = buf[i]; - buf[i] = av_clipl_int32((int64_t)*iir + (1 << 15)) >> 16; - } -} - -/** - * Estimate autocorrelation of the input vector. - * - * @param buf input buffer - * @param autocorr autocorrelation coefficients vector - */ -static void comp_autocorr(int16_t *buf, int16_t *autocorr) -{ - int i, scale, temp; - int16_t vector[LPC_FRAME]; - - ff_g723_1_scale_vector(vector, buf, LPC_FRAME); - - /* Apply the Hamming window */ - for (i = 0; i < LPC_FRAME; i++) - vector[i] = (vector[i] * hamming_window[i] + (1 << 14)) >> 15; - - /* Compute the first autocorrelation coefficient */ - temp = ff_dot_product(vector, vector, LPC_FRAME); - - /* Apply a white noise correlation factor of (1025/1024) */ - temp += temp >> 10; - - /* Normalize */ - scale = normalize_bits_int32(temp); - autocorr[0] = av_clipl_int32((int64_t)(temp << scale) + - (1 << 15)) >> 16; - - /* Compute the remaining coefficients */ - if (!autocorr[0]) { - memset(autocorr + 1, 0, LPC_ORDER * sizeof(int16_t)); - } else { - for (i = 1; i <= LPC_ORDER; i++) { - temp = ff_dot_product(vector, vector + i, LPC_FRAME - i); - temp = MULL2((temp << scale), binomial_window[i - 1]); - autocorr[i] = av_clipl_int32((int64_t)temp + (1 << 15)) >> 16; - } - } -} - -/** - * Use Levinson-Durbin recursion to compute LPC coefficients from - * autocorrelation values. - * - * @param lpc LPC coefficients vector - * @param autocorr autocorrelation coefficients vector - * @param error prediction error - */ -static void levinson_durbin(int16_t *lpc, int16_t *autocorr, int16_t error) -{ - int16_t vector[LPC_ORDER]; - int16_t partial_corr; - int i, j, temp; - - memset(lpc, 0, LPC_ORDER * sizeof(int16_t)); - - for (i = 0; i < LPC_ORDER; i++) { - /* Compute the partial correlation coefficient */ - temp = 0; - for (j = 0; j < i; j++) - temp -= lpc[j] * autocorr[i - j - 1]; - temp = ((autocorr[i] << 13) + temp) << 3; - - if (FFABS(temp) >= (error << 16)) - break; - - partial_corr = temp / (error << 1); - - lpc[i] = av_clipl_int32((int64_t)(partial_corr << 14) + - (1 << 15)) >> 16; - - /* Update the prediction error */ - temp = MULL2(temp, partial_corr); - error = av_clipl_int32((int64_t)(error << 16) - temp + - (1 << 15)) >> 16; - - memcpy(vector, lpc, i * sizeof(int16_t)); - for (j = 0; j < i; j++) { - temp = partial_corr * vector[i - j - 1] << 1; - lpc[j] = av_clipl_int32((int64_t)(lpc[j] << 16) - temp + - (1 << 15)) >> 16; - } - } -} - -/** - * Calculate LPC coefficients for the current frame. - * - * @param buf current frame - * @param prev_data 2 trailing subframes of the previous frame - * @param lpc LPC coefficients vector - */ -static void comp_lpc_coeff(int16_t *buf, int16_t *lpc) -{ - int16_t autocorr[(LPC_ORDER + 1) * SUBFRAMES]; - int16_t *autocorr_ptr = autocorr; - int16_t *lpc_ptr = lpc; - int i, j; - - for (i = 0, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) { - comp_autocorr(buf + i, autocorr_ptr); - levinson_durbin(lpc_ptr, autocorr_ptr + 1, autocorr_ptr[0]); - - lpc_ptr += LPC_ORDER; - autocorr_ptr += LPC_ORDER + 1; - } -} - -static void lpc2lsp(int16_t *lpc, int16_t *prev_lsp, int16_t *lsp) -{ - int f[LPC_ORDER + 2]; ///< coefficients of the sum and difference - ///< polynomials (F1, F2) ordered as - ///< f1[0], f2[0], ...., f1[5], f2[5] - - int max, shift, cur_val, prev_val, count, p; - int i, j; - int64_t temp; - - /* Initialize f1[0] and f2[0] to 1 in Q25 */ - for (i = 0; i < LPC_ORDER; i++) - lsp[i] = (lpc[i] * bandwidth_expand[i] + (1 << 14)) >> 15; - - /* Apply bandwidth expansion on the LPC coefficients */ - f[0] = f[1] = 1 << 25; - - /* Compute the remaining coefficients */ - for (i = 0; i < LPC_ORDER / 2; i++) { - /* f1 */ - f[2 * i + 2] = -f[2 * i] - ((lsp[i] + lsp[LPC_ORDER - 1 - i]) << 12); - /* f2 */ - f[2 * i + 3] = f[2 * i + 1] - ((lsp[i] - lsp[LPC_ORDER - 1 - i]) << 12); - } - - /* Divide f1[5] and f2[5] by 2 for use in polynomial evaluation */ - f[LPC_ORDER] >>= 1; - f[LPC_ORDER + 1] >>= 1; - - /* Normalize and shorten */ - max = FFABS(f[0]); - for (i = 1; i < LPC_ORDER + 2; i++) - max = FFMAX(max, FFABS(f[i])); - - shift = normalize_bits_int32(max); - - for (i = 0; i < LPC_ORDER + 2; i++) - f[i] = av_clipl_int32((int64_t)(f[i] << shift) + (1 << 15)) >> 16; - - /** - * Evaluate F1 and F2 at uniform intervals of pi/256 along the - * unit circle and check for zero crossings. - */ - p = 0; - temp = 0; - for (i = 0; i <= LPC_ORDER / 2; i++) - temp += f[2 * i] * cos_tab[0]; - prev_val = av_clipl_int32(temp << 1); - count = 0; - for ( i = 1; i < COS_TBL_SIZE / 2; i++) { - /* Evaluate */ - temp = 0; - for (j = 0; j <= LPC_ORDER / 2; j++) - temp += f[LPC_ORDER - 2 * j + p] * cos_tab[i * j % COS_TBL_SIZE]; - cur_val = av_clipl_int32(temp << 1); - - /* Check for sign change, indicating a zero crossing */ - if ((cur_val ^ prev_val) < 0) { - int abs_cur = FFABS(cur_val); - int abs_prev = FFABS(prev_val); - int sum = abs_cur + abs_prev; - - shift = normalize_bits_int32(sum); - sum <<= shift; - abs_prev = abs_prev << shift >> 8; - lsp[count++] = ((i - 1) << 7) + (abs_prev >> 1) / (sum >> 16); - - if (count == LPC_ORDER) - break; - - /* Switch between sum and difference polynomials */ - p ^= 1; - - /* Evaluate */ - temp = 0; - for (j = 0; j <= LPC_ORDER / 2; j++){ - temp += f[LPC_ORDER - 2 * j + p] * - cos_tab[i * j % COS_TBL_SIZE]; - } - cur_val = av_clipl_int32(temp<<1); - } - prev_val = cur_val; - } - - if (count != LPC_ORDER) - memcpy(lsp, prev_lsp, LPC_ORDER * sizeof(int16_t)); -} - -/** - * Quantize the current LSP subvector. - * - * @param num band number - * @param offset offset of the current subvector in an LPC_ORDER vector - * @param size size of the current subvector - */ -#define get_index(num, offset, size) \ -{\ - int error, max = -1;\ - int16_t temp[4];\ - int i, j;\ - for (i = 0; i < LSP_CB_SIZE; i++) {\ - for (j = 0; j < size; j++){\ - temp[j] = (weight[j + (offset)] * lsp_band##num[i][j] +\ - (1 << 14)) >> 15;\ - }\ - error = ff_g723_1_dot_product(lsp + (offset), temp, size) << 1;\ - error -= ff_g723_1_dot_product(lsp_band##num[i], temp, size);\ - if (error > max) {\ - max = error;\ - lsp_index[num] = i;\ - }\ - }\ -} - -/** - * Vector quantize the LSP frequencies. - * - * @param lsp the current lsp vector - * @param prev_lsp the previous lsp vector - */ -static void lsp_quantize(uint8_t *lsp_index, int16_t *lsp, int16_t *prev_lsp) -{ - int16_t weight[LPC_ORDER]; - int16_t min, max; - int shift, i; - - /* Calculate the VQ weighting vector */ - weight[0] = (1 << 20) / (lsp[1] - lsp[0]); - weight[LPC_ORDER - 1] = (1 << 20) / - (lsp[LPC_ORDER - 1] - lsp[LPC_ORDER - 2]); - - for (i = 1; i < LPC_ORDER - 1; i++) { - min = FFMIN(lsp[i] - lsp[i - 1], lsp[i + 1] - lsp[i]); - if (min > 0x20) - weight[i] = (1 << 20) / min; - else - weight[i] = INT16_MAX; - } - - /* Normalize */ - max = 0; - for (i = 0; i < LPC_ORDER; i++) - max = FFMAX(weight[i], max); - - shift = normalize_bits_int16(max); - for (i = 0; i < LPC_ORDER; i++) { - weight[i] <<= shift; - } - - /* Compute the VQ target vector */ - for (i = 0; i < LPC_ORDER; i++) { - lsp[i] -= dc_lsp[i] + - (((prev_lsp[i] - dc_lsp[i]) * 12288 + (1 << 14)) >> 15); - } - - get_index(0, 0, 3); - get_index(1, 3, 3); - get_index(2, 6, 4); -} - -/** - * Apply the formant perceptual weighting filter. - * - * @param flt_coef filter coefficients - * @param unq_lpc unquantized lpc vector - */ -static void perceptual_filter(G723_1_Context *p, int16_t *flt_coef, - int16_t *unq_lpc, int16_t *buf) -{ - int16_t vector[FRAME_LEN + LPC_ORDER]; - int i, j, k, l = 0; - - memcpy(buf, p->iir_mem, sizeof(int16_t) * LPC_ORDER); - memcpy(vector, p->fir_mem, sizeof(int16_t) * LPC_ORDER); - memcpy(vector + LPC_ORDER, buf + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); - - for (i = LPC_ORDER, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) { - for (k = 0; k < LPC_ORDER; k++) { - flt_coef[k + 2 * l] = (unq_lpc[k + l] * percept_flt_tbl[0][k] + - (1 << 14)) >> 15; - flt_coef[k + 2 * l + LPC_ORDER] = (unq_lpc[k + l] * - percept_flt_tbl[1][k] + - (1 << 14)) >> 15; - } - iir_filter(flt_coef + 2 * l, flt_coef + 2 * l + LPC_ORDER, vector + i, - buf + i, 0); - l += LPC_ORDER; - } - memcpy(p->iir_mem, buf + FRAME_LEN, sizeof(int16_t) * LPC_ORDER); - memcpy(p->fir_mem, vector + FRAME_LEN, sizeof(int16_t) * LPC_ORDER); -} - -/** - * Estimate the open loop pitch period. - * - * @param buf perceptually weighted speech - * @param start estimation is carried out from this position - */ -static int estimate_pitch(int16_t *buf, int start) -{ - int max_exp = 32; - int max_ccr = 0x4000; - int max_eng = 0x7fff; - int index = PITCH_MIN; - int offset = start - PITCH_MIN + 1; - - int ccr, eng, orig_eng, ccr_eng, exp; - int diff, temp; - - int i; - - orig_eng = ff_dot_product(buf + offset, buf + offset, HALF_FRAME_LEN); - - for (i = PITCH_MIN; i <= PITCH_MAX - 3; i++) { - offset--; - - /* Update energy and compute correlation */ - orig_eng += buf[offset] * buf[offset] - - buf[offset + HALF_FRAME_LEN] * buf[offset + HALF_FRAME_LEN]; - ccr = ff_dot_product(buf + start, buf + offset, HALF_FRAME_LEN); - if (ccr <= 0) - continue; - - /* Split into mantissa and exponent to maintain precision */ - exp = normalize_bits_int32(ccr); - ccr = av_clipl_int32((int64_t)(ccr << exp) + (1 << 15)) >> 16; - exp <<= 1; - ccr *= ccr; - temp = normalize_bits_int32(ccr); - ccr = ccr << temp >> 16; - exp += temp; - - temp = normalize_bits_int32(orig_eng); - eng = av_clipl_int32((int64_t)(orig_eng << temp) + (1 << 15)) >> 16; - exp -= temp; - - if (ccr >= eng) { - exp--; - ccr >>= 1; - } - if (exp > max_exp) - continue; - - if (exp + 1 < max_exp) - goto update; - - /* Equalize exponents before comparison */ - if (exp + 1 == max_exp) - temp = max_ccr >> 1; - else - temp = max_ccr; - ccr_eng = ccr * max_eng; - diff = ccr_eng - eng * temp; - if (diff > 0 && (i - index < PITCH_MIN || diff > ccr_eng >> 2)) { -update: - index = i; - max_exp = exp; - max_ccr = ccr; - max_eng = eng; - } - } - return index; -} - -/** - * Compute harmonic noise filter parameters. - * - * @param buf perceptually weighted speech - * @param pitch_lag open loop pitch period - * @param hf harmonic filter parameters - */ -static void comp_harmonic_coeff(int16_t *buf, int16_t pitch_lag, HFParam *hf) -{ - int ccr, eng, max_ccr, max_eng; - int exp, max, diff; - int energy[15]; - int i, j; - - for (i = 0, j = pitch_lag - 3; j <= pitch_lag + 3; i++, j++) { - /* Compute residual energy */ - energy[i << 1] = ff_dot_product(buf - j, buf - j, SUBFRAME_LEN); - /* Compute correlation */ - energy[(i << 1) + 1] = ff_dot_product(buf, buf - j, SUBFRAME_LEN); - } - - /* Compute target energy */ - energy[14] = ff_dot_product(buf, buf, SUBFRAME_LEN); - - /* Normalize */ - max = 0; - for (i = 0; i < 15; i++) - max = FFMAX(max, FFABS(energy[i])); - - exp = normalize_bits_int32(max); - for (i = 0; i < 15; i++) { - energy[i] = av_clipl_int32((int64_t)(energy[i] << exp) + - (1 << 15)) >> 16; - } - - hf->index = -1; - hf->gain = 0; - max_ccr = 1; - max_eng = 0x7fff; - - for (i = 0; i <= 6; i++) { - eng = energy[i << 1]; - ccr = energy[(i << 1) + 1]; - - if (ccr <= 0) - continue; - - ccr = (ccr * ccr + (1 << 14)) >> 15; - diff = ccr * max_eng - eng * max_ccr; - if (diff > 0) { - max_ccr = ccr; - max_eng = eng; - hf->index = i; - } - } - - if (hf->index == -1) { - hf->index = pitch_lag; - return; - } - - eng = energy[14] * max_eng; - eng = (eng >> 2) + (eng >> 3); - ccr = energy[(hf->index << 1) + 1] * energy[(hf->index << 1) + 1]; - if (eng < ccr) { - eng = energy[(hf->index << 1) + 1]; - - if (eng >= max_eng) - hf->gain = 0x2800; - else - hf->gain = ((eng << 15) / max_eng * 0x2800 + (1 << 14)) >> 15; - } - hf->index += pitch_lag - 3; -} - -/** - * Apply the harmonic noise shaping filter. - * - * @param hf filter parameters - */ -static void harmonic_filter(HFParam *hf, const int16_t *src, int16_t *dest) -{ - int i; - - for (i = 0; i < SUBFRAME_LEN; i++) { - int64_t temp = hf->gain * src[i - hf->index] << 1; - dest[i] = av_clipl_int32((src[i] << 16) - temp + (1 << 15)) >> 16; - } -} - -static void harmonic_noise_sub(HFParam *hf, const int16_t *src, int16_t *dest) -{ - int i; - for (i = 0; i < SUBFRAME_LEN; i++) { - int64_t temp = hf->gain * src[i - hf->index] << 1; - dest[i] = av_clipl_int32(((dest[i] - src[i]) << 16) + temp + - (1 << 15)) >> 16; - - } -} - -/** - * Combined synthesis and formant perceptual weighting filer. - * - * @param qnt_lpc quantized lpc coefficients - * @param perf_lpc perceptual filter coefficients - * @param perf_fir perceptual filter fir memory - * @param perf_iir perceptual filter iir memory - * @param scale the filter output will be scaled by 2^scale - */ -static void synth_percept_filter(int16_t *qnt_lpc, int16_t *perf_lpc, - int16_t *perf_fir, int16_t *perf_iir, - const int16_t *src, int16_t *dest, int scale) -{ - int i, j; - int16_t buf_16[SUBFRAME_LEN + LPC_ORDER]; - int64_t buf[SUBFRAME_LEN]; - - int16_t *bptr_16 = buf_16 + LPC_ORDER; - - memcpy(buf_16, perf_fir, sizeof(int16_t) * LPC_ORDER); - memcpy(dest - LPC_ORDER, perf_iir, sizeof(int16_t) * LPC_ORDER); - - for (i = 0; i < SUBFRAME_LEN; i++) { - int64_t temp = 0; - for (j = 1; j <= LPC_ORDER; j++) - temp -= qnt_lpc[j - 1] * bptr_16[i - j]; - - buf[i] = (src[i] << 15) + (temp << 3); - bptr_16[i] = av_clipl_int32(buf[i] + (1 << 15)) >> 16; - } - - for (i = 0; i < SUBFRAME_LEN; i++) { - int64_t fir = 0, iir = 0; - for (j = 1; j <= LPC_ORDER; j++) { - fir -= perf_lpc[j - 1] * bptr_16[i - j]; - iir += perf_lpc[j + LPC_ORDER - 1] * dest[i - j]; - } - dest[i] = av_clipl_int32(((buf[i] + (fir << 3)) << scale) + (iir << 3) + - (1 << 15)) >> 16; - } - memcpy(perf_fir, buf_16 + SUBFRAME_LEN, sizeof(int16_t) * LPC_ORDER); - memcpy(perf_iir, dest + SUBFRAME_LEN - LPC_ORDER, - sizeof(int16_t) * LPC_ORDER); -} - -/** - * Compute the adaptive codebook contribution. - * - * @param buf input signal - * @param index the current subframe index - */ -static void acb_search(G723_1_Context *p, int16_t *residual, - int16_t *impulse_resp, const int16_t *buf, - int index) -{ - - int16_t flt_buf[PITCH_ORDER][SUBFRAME_LEN]; - - const int16_t *cb_tbl = adaptive_cb_gain85; - - int ccr_buf[PITCH_ORDER * SUBFRAMES << 2]; - - int pitch_lag = p->pitch_lag[index >> 1]; - int acb_lag = 1; - int acb_gain = 0; - int odd_frame = index & 1; - int iter = 3 + odd_frame; - int count = 0; - int tbl_size = 85; - - int i, j, k, l, max; - int64_t temp; - - if (!odd_frame) { - if (pitch_lag == PITCH_MIN) - pitch_lag++; - else - pitch_lag = FFMIN(pitch_lag, PITCH_MAX - 5); - } - - for (i = 0; i < iter; i++) { - ff_g723_1_get_residual(residual, p->prev_excitation, pitch_lag + i - 1); - - for (j = 0; j < SUBFRAME_LEN; j++) { - temp = 0; - for (k = 0; k <= j; k++) - temp += residual[PITCH_ORDER - 1 + k] * impulse_resp[j - k]; - flt_buf[PITCH_ORDER - 1][j] = av_clipl_int32((temp << 1) + - (1 << 15)) >> 16; - } - - for (j = PITCH_ORDER - 2; j >= 0; j--) { - flt_buf[j][0] = ((residual[j] << 13) + (1 << 14)) >> 15; - for (k = 1; k < SUBFRAME_LEN; k++) { - temp = (flt_buf[j + 1][k - 1] << 15) + - residual[j] * impulse_resp[k]; - flt_buf[j][k] = av_clipl_int32((temp << 1) + (1 << 15)) >> 16; - } - } - - /* Compute crosscorrelation with the signal */ - for (j = 0; j < PITCH_ORDER; j++) { - temp = ff_dot_product(buf, flt_buf[j], SUBFRAME_LEN); - ccr_buf[count++] = av_clipl_int32(temp << 1); - } - - /* Compute energies */ - for (j = 0; j < PITCH_ORDER; j++) { - ccr_buf[count++] = ff_g723_1_dot_product(flt_buf[j], flt_buf[j], - SUBFRAME_LEN); - } - - for (j = 1; j < PITCH_ORDER; j++) { - for (k = 0; k < j; k++) { - temp = ff_dot_product(flt_buf[j], flt_buf[k], SUBFRAME_LEN); - ccr_buf[count++] = av_clipl_int32(temp<<2); - } - } - } - - /* Normalize and shorten */ - max = 0; - for (i = 0; i < 20 * iter; i++) - max = FFMAX(max, FFABS(ccr_buf[i])); - - temp = normalize_bits_int32(max); - - for (i = 0; i < 20 * iter; i++){ - ccr_buf[i] = av_clipl_int32((int64_t)(ccr_buf[i] << temp) + - (1 << 15)) >> 16; - } - - max = 0; - for (i = 0; i < iter; i++) { - /* Select quantization table */ - if (!odd_frame && pitch_lag + i - 1 >= SUBFRAME_LEN - 2 || - odd_frame && pitch_lag >= SUBFRAME_LEN - 2) { - cb_tbl = adaptive_cb_gain170; - tbl_size = 170; - } - - for (j = 0, k = 0; j < tbl_size; j++, k += 20) { - temp = 0; - for (l = 0; l < 20; l++) - temp += ccr_buf[20 * i + l] * cb_tbl[k + l]; - temp = av_clipl_int32(temp); - - if (temp > max) { - max = temp; - acb_gain = j; - acb_lag = i; - } - } - } - - if (!odd_frame) { - pitch_lag += acb_lag - 1; - acb_lag = 1; - } - - p->pitch_lag[index >> 1] = pitch_lag; - p->subframe[index].ad_cb_lag = acb_lag; - p->subframe[index].ad_cb_gain = acb_gain; -} - -/** - * Subtract the adaptive codebook contribution from the input - * to obtain the residual. - * - * @param buf target vector - */ -static void sub_acb_contrib(const int16_t *residual, const int16_t *impulse_resp, - int16_t *buf) -{ - int i, j; - /* Subtract adaptive CB contribution to obtain the residual */ - for (i = 0; i < SUBFRAME_LEN; i++) { - int64_t temp = buf[i] << 14; - for (j = 0; j <= i; j++) - temp -= residual[j] * impulse_resp[i - j]; - - buf[i] = av_clipl_int32((temp << 2) + (1 << 15)) >> 16; - } -} - -/** - * Quantize the residual signal using the fixed codebook (MP-MLQ). - * - * @param optim optimized fixed codebook parameters - * @param buf excitation vector - */ -static void get_fcb_param(FCBParam *optim, int16_t *impulse_resp, - int16_t *buf, int pulse_cnt, int pitch_lag) -{ - FCBParam param; - int16_t impulse_r[SUBFRAME_LEN]; - int16_t temp_corr[SUBFRAME_LEN]; - int16_t impulse_corr[SUBFRAME_LEN]; - - int ccr1[SUBFRAME_LEN]; - int ccr2[SUBFRAME_LEN]; - int amp, err, max, max_amp_index, min, scale, i, j, k, l; - - int64_t temp; - - /* Update impulse response */ - memcpy(impulse_r, impulse_resp, sizeof(int16_t) * SUBFRAME_LEN); - param.dirac_train = 0; - if (pitch_lag < SUBFRAME_LEN - 2) { - param.dirac_train = 1; - ff_g723_1_gen_dirac_train(impulse_r, pitch_lag); - } - - for (i = 0; i < SUBFRAME_LEN; i++) - temp_corr[i] = impulse_r[i] >> 1; - - /* Compute impulse response autocorrelation */ - temp = ff_g723_1_dot_product(temp_corr, temp_corr, SUBFRAME_LEN); - - scale = normalize_bits_int32(temp); - impulse_corr[0] = av_clipl_int32((temp << scale) + (1 << 15)) >> 16; - - for (i = 1; i < SUBFRAME_LEN; i++) { - temp = ff_g723_1_dot_product(temp_corr + i, temp_corr, SUBFRAME_LEN - i); - impulse_corr[i] = av_clipl_int32((temp << scale) + (1 << 15)) >> 16; - } - - /* Compute crosscorrelation of impulse response with residual signal */ - scale -= 4; - for (i = 0; i < SUBFRAME_LEN; i++){ - temp = ff_g723_1_dot_product(buf + i, impulse_r, SUBFRAME_LEN - i); - if (scale < 0) - ccr1[i] = temp >> -scale; - else - ccr1[i] = av_clipl_int32(temp << scale); - } - - /* Search loop */ - for (i = 0; i < GRID_SIZE; i++) { - /* Maximize the crosscorrelation */ - max = 0; - for (j = i; j < SUBFRAME_LEN; j += GRID_SIZE) { - temp = FFABS(ccr1[j]); - if (temp >= max) { - max = temp; - param.pulse_pos[0] = j; - } - } - - /* Quantize the gain (max crosscorrelation/impulse_corr[0]) */ - amp = max; - min = 1 << 30; - max_amp_index = GAIN_LEVELS - 2; - for (j = max_amp_index; j >= 2; j--) { - temp = av_clipl_int32((int64_t)fixed_cb_gain[j] * - impulse_corr[0] << 1); - temp = FFABS(temp - amp); - if (temp < min) { - min = temp; - max_amp_index = j; - } - } - - max_amp_index--; - /* Select additional gain values */ - for (j = 1; j < 5; j++) { - for (k = i; k < SUBFRAME_LEN; k += GRID_SIZE) { - temp_corr[k] = 0; - ccr2[k] = ccr1[k]; - } - param.amp_index = max_amp_index + j - 2; - amp = fixed_cb_gain[param.amp_index]; - - param.pulse_sign[0] = (ccr2[param.pulse_pos[0]] < 0) ? -amp : amp; - temp_corr[param.pulse_pos[0]] = 1; - - for (k = 1; k < pulse_cnt; k++) { - max = INT_MIN; - for (l = i; l < SUBFRAME_LEN; l += GRID_SIZE) { - if (temp_corr[l]) - continue; - temp = impulse_corr[FFABS(l - param.pulse_pos[k - 1])]; - temp = av_clipl_int32((int64_t)temp * - param.pulse_sign[k - 1] << 1); - ccr2[l] -= temp; - temp = FFABS(ccr2[l]); - if (temp > max) { - max = temp; - param.pulse_pos[k] = l; - } - } - - param.pulse_sign[k] = (ccr2[param.pulse_pos[k]] < 0) ? - -amp : amp; - temp_corr[param.pulse_pos[k]] = 1; - } - - /* Create the error vector */ - memset(temp_corr, 0, sizeof(int16_t) * SUBFRAME_LEN); - - for (k = 0; k < pulse_cnt; k++) - temp_corr[param.pulse_pos[k]] = param.pulse_sign[k]; - - for (k = SUBFRAME_LEN - 1; k >= 0; k--) { - temp = 0; - for (l = 0; l <= k; l++) { - int prod = av_clipl_int32((int64_t)temp_corr[l] * - impulse_r[k - l] << 1); - temp = av_clipl_int32(temp + prod); - } - temp_corr[k] = temp << 2 >> 16; - } - - /* Compute square of error */ - err = 0; - for (k = 0; k < SUBFRAME_LEN; k++) { - int64_t prod; - prod = av_clipl_int32((int64_t)buf[k] * temp_corr[k] << 1); - err = av_clipl_int32(err - prod); - prod = av_clipl_int32((int64_t)temp_corr[k] * temp_corr[k]); - err = av_clipl_int32(err + prod); - } - - /* Minimize */ - if (err < optim->min_err) { - optim->min_err = err; - optim->grid_index = i; - optim->amp_index = param.amp_index; - optim->dirac_train = param.dirac_train; - - for (k = 0; k < pulse_cnt; k++) { - optim->pulse_sign[k] = param.pulse_sign[k]; - optim->pulse_pos[k] = param.pulse_pos[k]; - } - } - } - } -} - -/** - * Encode the pulse position and gain of the current subframe. - * - * @param optim optimized fixed CB parameters - * @param buf excitation vector - */ -static void pack_fcb_param(G723_1_Subframe *subfrm, FCBParam *optim, - int16_t *buf, int pulse_cnt) -{ - int i, j; - - j = PULSE_MAX - pulse_cnt; - - subfrm->pulse_sign = 0; - subfrm->pulse_pos = 0; - - for (i = 0; i < SUBFRAME_LEN >> 1; i++) { - int val = buf[optim->grid_index + (i << 1)]; - if (!val) { - subfrm->pulse_pos += combinatorial_table[j][i]; - } else { - subfrm->pulse_sign <<= 1; - if (val < 0) subfrm->pulse_sign++; - j++; - - if (j == PULSE_MAX) break; - } - } - subfrm->amp_index = optim->amp_index; - subfrm->grid_index = optim->grid_index; - subfrm->dirac_train = optim->dirac_train; -} - -/** - * Compute the fixed codebook excitation. - * - * @param buf target vector - * @param impulse_resp impulse response of the combined filter - */ -static void fcb_search(G723_1_Context *p, int16_t *impulse_resp, - int16_t *buf, int index) -{ - FCBParam optim; - int pulse_cnt = pulses[index]; - int i; - - optim.min_err = 1 << 30; - get_fcb_param(&optim, impulse_resp, buf, pulse_cnt, SUBFRAME_LEN); - - if (p->pitch_lag[index >> 1] < SUBFRAME_LEN - 2) { - get_fcb_param(&optim, impulse_resp, buf, pulse_cnt, - p->pitch_lag[index >> 1]); - } - - /* Reconstruct the excitation */ - memset(buf, 0, sizeof(int16_t) * SUBFRAME_LEN); - for (i = 0; i < pulse_cnt; i++) - buf[optim.pulse_pos[i]] = optim.pulse_sign[i]; - - pack_fcb_param(&p->subframe[index], &optim, buf, pulse_cnt); - - if (optim.dirac_train) - ff_g723_1_gen_dirac_train(buf, p->pitch_lag[index >> 1]); -} - -/** - * Pack the frame parameters into output bitstream. - * - * @param frame output buffer - * @param size size of the buffer - */ -static int pack_bitstream(G723_1_Context *p, unsigned char *frame, int size) -{ - PutBitContext pb; - int info_bits, i, temp; - - init_put_bits(&pb, frame, size); - - if (p->cur_rate == RATE_6300) { - info_bits = 0; - put_bits(&pb, 2, info_bits); - }else - av_assert0(0); - - put_bits(&pb, 8, p->lsp_index[2]); - put_bits(&pb, 8, p->lsp_index[1]); - put_bits(&pb, 8, p->lsp_index[0]); - - put_bits(&pb, 7, p->pitch_lag[0] - PITCH_MIN); - put_bits(&pb, 2, p->subframe[1].ad_cb_lag); - put_bits(&pb, 7, p->pitch_lag[1] - PITCH_MIN); - put_bits(&pb, 2, p->subframe[3].ad_cb_lag); - - /* Write 12 bit combined gain */ - for (i = 0; i < SUBFRAMES; i++) { - temp = p->subframe[i].ad_cb_gain * GAIN_LEVELS + - p->subframe[i].amp_index; - if (p->cur_rate == RATE_6300) - temp += p->subframe[i].dirac_train << 11; - put_bits(&pb, 12, temp); - } - - put_bits(&pb, 1, p->subframe[0].grid_index); - put_bits(&pb, 1, p->subframe[1].grid_index); - put_bits(&pb, 1, p->subframe[2].grid_index); - put_bits(&pb, 1, p->subframe[3].grid_index); - - if (p->cur_rate == RATE_6300) { - skip_put_bits(&pb, 1); /* reserved bit */ - - /* Write 13 bit combined position index */ - temp = (p->subframe[0].pulse_pos >> 16) * 810 + - (p->subframe[1].pulse_pos >> 14) * 90 + - (p->subframe[2].pulse_pos >> 16) * 9 + - (p->subframe[3].pulse_pos >> 14); - put_bits(&pb, 13, temp); - - put_bits(&pb, 16, p->subframe[0].pulse_pos & 0xffff); - put_bits(&pb, 14, p->subframe[1].pulse_pos & 0x3fff); - put_bits(&pb, 16, p->subframe[2].pulse_pos & 0xffff); - put_bits(&pb, 14, p->subframe[3].pulse_pos & 0x3fff); - - put_bits(&pb, 6, p->subframe[0].pulse_sign); - put_bits(&pb, 5, p->subframe[1].pulse_sign); - put_bits(&pb, 6, p->subframe[2].pulse_sign); - put_bits(&pb, 5, p->subframe[3].pulse_sign); - } - - flush_put_bits(&pb); - return frame_size[info_bits]; -} - -static int g723_1_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, - const AVFrame *frame, int *got_packet_ptr) -{ - G723_1_Context *p = avctx->priv_data; - int16_t unq_lpc[LPC_ORDER * SUBFRAMES]; - int16_t qnt_lpc[LPC_ORDER * SUBFRAMES]; - int16_t cur_lsp[LPC_ORDER]; - int16_t weighted_lpc[LPC_ORDER * SUBFRAMES << 1]; - int16_t vector[FRAME_LEN + PITCH_MAX]; - int offset, ret; - int16_t *in_orig = av_memdup(frame->data[0], frame->nb_samples * sizeof(int16_t)); - int16_t *in = in_orig; - - HFParam hf[4]; - int i, j; - - if (!in) - return AVERROR(ENOMEM); - - highpass_filter(in, &p->hpf_fir_mem, &p->hpf_iir_mem); - - memcpy(vector, p->prev_data, HALF_FRAME_LEN * sizeof(int16_t)); - memcpy(vector + HALF_FRAME_LEN, in, FRAME_LEN * sizeof(int16_t)); - - comp_lpc_coeff(vector, unq_lpc); - lpc2lsp(&unq_lpc[LPC_ORDER * 3], p->prev_lsp, cur_lsp); - lsp_quantize(p->lsp_index, cur_lsp, p->prev_lsp); - - /* Update memory */ - memcpy(vector + LPC_ORDER, p->prev_data + SUBFRAME_LEN, - sizeof(int16_t) * SUBFRAME_LEN); - memcpy(vector + LPC_ORDER + SUBFRAME_LEN, in, - sizeof(int16_t) * (HALF_FRAME_LEN + SUBFRAME_LEN)); - memcpy(p->prev_data, in + HALF_FRAME_LEN, - sizeof(int16_t) * HALF_FRAME_LEN); - memcpy(in, vector + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); - - perceptual_filter(p, weighted_lpc, unq_lpc, vector); - - memcpy(in, vector + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); - memcpy(vector, p->prev_weight_sig, sizeof(int16_t) * PITCH_MAX); - memcpy(vector + PITCH_MAX, in, sizeof(int16_t) * FRAME_LEN); - - ff_g723_1_scale_vector(vector, vector, FRAME_LEN + PITCH_MAX); - - p->pitch_lag[0] = estimate_pitch(vector, PITCH_MAX); - p->pitch_lag[1] = estimate_pitch(vector, PITCH_MAX + HALF_FRAME_LEN); - - for (i = PITCH_MAX, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) - comp_harmonic_coeff(vector + i, p->pitch_lag[j >> 1], hf + j); - - memcpy(vector, p->prev_weight_sig, sizeof(int16_t) * PITCH_MAX); - memcpy(vector + PITCH_MAX, in, sizeof(int16_t) * FRAME_LEN); - memcpy(p->prev_weight_sig, vector + FRAME_LEN, sizeof(int16_t) * PITCH_MAX); - - for (i = 0, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) - harmonic_filter(hf + j, vector + PITCH_MAX + i, in + i); - - ff_g723_1_inverse_quant(cur_lsp, p->prev_lsp, p->lsp_index, 0); - ff_g723_1_lsp_interpolate(qnt_lpc, cur_lsp, p->prev_lsp); - - memcpy(p->prev_lsp, cur_lsp, sizeof(int16_t) * LPC_ORDER); - - offset = 0; - for (i = 0; i < SUBFRAMES; i++) { - int16_t impulse_resp[SUBFRAME_LEN]; - int16_t residual[SUBFRAME_LEN + PITCH_ORDER - 1]; - int16_t flt_in[SUBFRAME_LEN]; - int16_t zero[LPC_ORDER], fir[LPC_ORDER], iir[LPC_ORDER]; - - /** - * Compute the combined impulse response of the synthesis filter, - * formant perceptual weighting filter and harmonic noise shaping filter - */ - memset(zero, 0, sizeof(int16_t) * LPC_ORDER); - memset(vector, 0, sizeof(int16_t) * PITCH_MAX); - memset(flt_in, 0, sizeof(int16_t) * SUBFRAME_LEN); - - flt_in[0] = 1 << 13; /* Unit impulse */ - synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), - zero, zero, flt_in, vector + PITCH_MAX, 1); - harmonic_filter(hf + i, vector + PITCH_MAX, impulse_resp); - - /* Compute the combined zero input response */ - flt_in[0] = 0; - memcpy(fir, p->perf_fir_mem, sizeof(int16_t) * LPC_ORDER); - memcpy(iir, p->perf_iir_mem, sizeof(int16_t) * LPC_ORDER); - - synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), - fir, iir, flt_in, vector + PITCH_MAX, 0); - memcpy(vector, p->harmonic_mem, sizeof(int16_t) * PITCH_MAX); - harmonic_noise_sub(hf + i, vector + PITCH_MAX, in); - - acb_search(p, residual, impulse_resp, in, i); - ff_g723_1_gen_acb_excitation(residual, p->prev_excitation,p->pitch_lag[i >> 1], - &p->subframe[i], p->cur_rate); - sub_acb_contrib(residual, impulse_resp, in); - - fcb_search(p, impulse_resp, in, i); - - /* Reconstruct the excitation */ - ff_g723_1_gen_acb_excitation(impulse_resp, p->prev_excitation, p->pitch_lag[i >> 1], - &p->subframe[i], RATE_6300); - - memmove(p->prev_excitation, p->prev_excitation + SUBFRAME_LEN, - sizeof(int16_t) * (PITCH_MAX - SUBFRAME_LEN)); - for (j = 0; j < SUBFRAME_LEN; j++) - in[j] = av_clip_int16((in[j] << 1) + impulse_resp[j]); - memcpy(p->prev_excitation + PITCH_MAX - SUBFRAME_LEN, in, - sizeof(int16_t) * SUBFRAME_LEN); - - /* Update filter memories */ - synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), - p->perf_fir_mem, p->perf_iir_mem, - in, vector + PITCH_MAX, 0); - memmove(p->harmonic_mem, p->harmonic_mem + SUBFRAME_LEN, - sizeof(int16_t) * (PITCH_MAX - SUBFRAME_LEN)); - memcpy(p->harmonic_mem + PITCH_MAX - SUBFRAME_LEN, vector + PITCH_MAX, - sizeof(int16_t) * SUBFRAME_LEN); - - in += SUBFRAME_LEN; - offset += LPC_ORDER; - } - - av_freep(&in_orig); in = NULL; - - if ((ret = ff_alloc_packet2(avctx, avpkt, 24, 0)) < 0) - return ret; - - *got_packet_ptr = 1; - avpkt->size = pack_bitstream(p, avpkt->data, avpkt->size); - return 0; -} - -AVCodec ff_g723_1_encoder = { - .name = "g723_1", - .long_name = NULL_IF_CONFIG_SMALL("G.723.1"), - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_G723_1, - .priv_data_size = sizeof(G723_1_Context), - .init = g723_1_encode_init, - .encode2 = g723_1_encode_frame, - .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16, - AV_SAMPLE_FMT_NONE}, -}; -#endif diff --git a/libavcodec/g723_1enc.c b/libavcodec/g723_1enc.c new file mode 100644 index 0000000000..974caf0d9c --- /dev/null +++ b/libavcodec/g723_1enc.c @@ -0,0 +1,1202 @@ +/* + * G.723.1 compatible encoder + * Copyright (c) Mohamed Naufal + * + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * G.723.1 compatible encoder + */ + +#include +#include + +#include "libavutil/channel_layout.h" +#include "libavutil/common.h" +#include "libavutil/mem.h" +#include "libavutil/opt.h" + +#include "avcodec.h" +#include "celp_math.h" +#include "g723_1.h" +#include "internal.h" + +#define BITSTREAM_WRITER_LE +#include "put_bits.h" + +static av_cold int g723_1_encode_init(AVCodecContext *avctx) +{ + G723_1_Context *p = avctx->priv_data; + + if (avctx->sample_rate != 8000) { + av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); + return AVERROR(EINVAL); + } + + if (avctx->channels != 1) { + av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); + return AVERROR(EINVAL); + } + + if (avctx->bit_rate == 6300) { + p->cur_rate = RATE_6300; + } else if (avctx->bit_rate == 5300) { + av_log(avctx, AV_LOG_ERROR, "Bitrate not supported yet, use 6300\n"); + return AVERROR_PATCHWELCOME; + } else { + av_log(avctx, AV_LOG_ERROR, "Bitrate not supported, use 6300\n"); + return AVERROR(EINVAL); + } + avctx->frame_size = 240; + memcpy(p->prev_lsp, dc_lsp, LPC_ORDER * sizeof(int16_t)); + + return 0; +} + +/** + * Remove DC component from the input signal. + * + * @param buf input signal + * @param fir zero memory + * @param iir pole memory + */ +static void highpass_filter(int16_t *buf, int16_t *fir, int *iir) +{ + int i; + for (i = 0; i < FRAME_LEN; i++) { + *iir = (buf[i] << 15) + ((-*fir) << 15) + MULL2(*iir, 0x7f00); + *fir = buf[i]; + buf[i] = av_clipl_int32((int64_t)*iir + (1 << 15)) >> 16; + } +} + +/** + * Estimate autocorrelation of the input vector. + * + * @param buf input buffer + * @param autocorr autocorrelation coefficients vector + */ +static void comp_autocorr(int16_t *buf, int16_t *autocorr) +{ + int i, scale, temp; + int16_t vector[LPC_FRAME]; + + ff_g723_1_scale_vector(vector, buf, LPC_FRAME); + + /* Apply the Hamming window */ + for (i = 0; i < LPC_FRAME; i++) + vector[i] = (vector[i] * hamming_window[i] + (1 << 14)) >> 15; + + /* Compute the first autocorrelation coefficient */ + temp = ff_dot_product(vector, vector, LPC_FRAME); + + /* Apply a white noise correlation factor of (1025/1024) */ + temp += temp >> 10; + + /* Normalize */ + scale = ff_g723_1_normalize_bits(temp, 31); + autocorr[0] = av_clipl_int32((int64_t) (temp << scale) + + (1 << 15)) >> 16; + + /* Compute the remaining coefficients */ + if (!autocorr[0]) { + memset(autocorr + 1, 0, LPC_ORDER * sizeof(int16_t)); + } else { + for (i = 1; i <= LPC_ORDER; i++) { + temp = ff_dot_product(vector, vector + i, LPC_FRAME - i); + temp = MULL2((temp << scale), binomial_window[i - 1]); + autocorr[i] = av_clipl_int32((int64_t) temp + (1 << 15)) >> 16; + } + } +} + +/** + * Use Levinson-Durbin recursion to compute LPC coefficients from + * autocorrelation values. + * + * @param lpc LPC coefficients vector + * @param autocorr autocorrelation coefficients vector + * @param error prediction error + */ +static void levinson_durbin(int16_t *lpc, int16_t *autocorr, int16_t error) +{ + int16_t vector[LPC_ORDER]; + int16_t partial_corr; + int i, j, temp; + + memset(lpc, 0, LPC_ORDER * sizeof(int16_t)); + + for (i = 0; i < LPC_ORDER; i++) { + /* Compute the partial correlation coefficient */ + temp = 0; + for (j = 0; j < i; j++) + temp -= lpc[j] * autocorr[i - j - 1]; + temp = ((autocorr[i] << 13) + temp) << 3; + + if (FFABS(temp) >= (error << 16)) + break; + + partial_corr = temp / (error << 1); + + lpc[i] = av_clipl_int32((int64_t) (partial_corr << 14) + + (1 << 15)) >> 16; + + /* Update the prediction error */ + temp = MULL2(temp, partial_corr); + error = av_clipl_int32((int64_t) (error << 16) - temp + + (1 << 15)) >> 16; + + memcpy(vector, lpc, i * sizeof(int16_t)); + for (j = 0; j < i; j++) { + temp = partial_corr * vector[i - j - 1] << 1; + lpc[j] = av_clipl_int32((int64_t) (lpc[j] << 16) - temp + + (1 << 15)) >> 16; + } + } +} + +/** + * Calculate LPC coefficients for the current frame. + * + * @param buf current frame + * @param prev_data 2 trailing subframes of the previous frame + * @param lpc LPC coefficients vector + */ +static void comp_lpc_coeff(int16_t *buf, int16_t *lpc) +{ + int16_t autocorr[(LPC_ORDER + 1) * SUBFRAMES]; + int16_t *autocorr_ptr = autocorr; + int16_t *lpc_ptr = lpc; + int i, j; + + for (i = 0, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) { + comp_autocorr(buf + i, autocorr_ptr); + levinson_durbin(lpc_ptr, autocorr_ptr + 1, autocorr_ptr[0]); + + lpc_ptr += LPC_ORDER; + autocorr_ptr += LPC_ORDER + 1; + } +} + +static void lpc2lsp(int16_t *lpc, int16_t *prev_lsp, int16_t *lsp) +{ + int f[LPC_ORDER + 2]; ///< coefficients of the sum and difference + ///< polynomials (F1, F2) ordered as + ///< f1[0], f2[0], ...., f1[5], f2[5] + + int max, shift, cur_val, prev_val, count, p; + int i, j; + int64_t temp; + + /* Initialize f1[0] and f2[0] to 1 in Q25 */ + for (i = 0; i < LPC_ORDER; i++) + lsp[i] = (lpc[i] * bandwidth_expand[i] + (1 << 14)) >> 15; + + /* Apply bandwidth expansion on the LPC coefficients */ + f[0] = f[1] = 1 << 25; + + /* Compute the remaining coefficients */ + for (i = 0; i < LPC_ORDER / 2; i++) { + /* f1 */ + f[2 * i + 2] = -f[2 * i] - ((lsp[i] + lsp[LPC_ORDER - 1 - i]) << 12); + /* f2 */ + f[2 * i + 3] = f[2 * i + 1] - ((lsp[i] - lsp[LPC_ORDER - 1 - i]) << 12); + } + + /* Divide f1[5] and f2[5] by 2 for use in polynomial evaluation */ + f[LPC_ORDER] >>= 1; + f[LPC_ORDER + 1] >>= 1; + + /* Normalize and shorten */ + max = FFABS(f[0]); + for (i = 1; i < LPC_ORDER + 2; i++) + max = FFMAX(max, FFABS(f[i])); + + shift = ff_g723_1_normalize_bits(max, 31); + + for (i = 0; i < LPC_ORDER + 2; i++) + f[i] = av_clipl_int32((int64_t) (f[i] << shift) + (1 << 15)) >> 16; + + /** + * Evaluate F1 and F2 at uniform intervals of pi/256 along the + * unit circle and check for zero crossings. + */ + p = 0; + temp = 0; + for (i = 0; i <= LPC_ORDER / 2; i++) + temp += f[2 * i] * cos_tab[0]; + prev_val = av_clipl_int32(temp << 1); + count = 0; + for (i = 1; i < COS_TBL_SIZE / 2; i++) { + /* Evaluate */ + temp = 0; + for (j = 0; j <= LPC_ORDER / 2; j++) + temp += f[LPC_ORDER - 2 * j + p] * cos_tab[i * j % COS_TBL_SIZE]; + cur_val = av_clipl_int32(temp << 1); + + /* Check for sign change, indicating a zero crossing */ + if ((cur_val ^ prev_val) < 0) { + int abs_cur = FFABS(cur_val); + int abs_prev = FFABS(prev_val); + int sum = abs_cur + abs_prev; + + shift = ff_g723_1_normalize_bits(sum, 31); + sum <<= shift; + abs_prev = abs_prev << shift >> 8; + lsp[count++] = ((i - 1) << 7) + (abs_prev >> 1) / (sum >> 16); + + if (count == LPC_ORDER) + break; + + /* Switch between sum and difference polynomials */ + p ^= 1; + + /* Evaluate */ + temp = 0; + for (j = 0; j <= LPC_ORDER / 2; j++) + temp += f[LPC_ORDER - 2 * j + p] * + cos_tab[i * j % COS_TBL_SIZE]; + cur_val = av_clipl_int32(temp << 1); + } + prev_val = cur_val; + } + + if (count != LPC_ORDER) + memcpy(lsp, prev_lsp, LPC_ORDER * sizeof(int16_t)); +} + +/** + * Quantize the current LSP subvector. + * + * @param num band number + * @param offset offset of the current subvector in an LPC_ORDER vector + * @param size size of the current subvector + */ +#define get_index(num, offset, size) \ +{ \ + int error, max = -1; \ + int16_t temp[4]; \ + int i, j; \ + \ + for (i = 0; i < LSP_CB_SIZE; i++) { \ + for (j = 0; j < size; j++){ \ + temp[j] = (weight[j + (offset)] * lsp_band##num[i][j] + \ + (1 << 14)) >> 15; \ + } \ + error = ff_g723_1_dot_product(lsp + (offset), temp, size) << 1; \ + error -= ff_g723_1_dot_product(lsp_band##num[i], temp, size); \ + if (error > max) { \ + max = error; \ + lsp_index[num] = i; \ + } \ + } \ +} + +/** + * Vector quantize the LSP frequencies. + * + * @param lsp the current lsp vector + * @param prev_lsp the previous lsp vector + */ +static void lsp_quantize(uint8_t *lsp_index, int16_t *lsp, int16_t *prev_lsp) +{ + int16_t weight[LPC_ORDER]; + int16_t min, max; + int shift, i; + + /* Calculate the VQ weighting vector */ + weight[0] = (1 << 20) / (lsp[1] - lsp[0]); + weight[LPC_ORDER - 1] = (1 << 20) / + (lsp[LPC_ORDER - 1] - lsp[LPC_ORDER - 2]); + + for (i = 1; i < LPC_ORDER - 1; i++) { + min = FFMIN(lsp[i] - lsp[i - 1], lsp[i + 1] - lsp[i]); + if (min > 0x20) + weight[i] = (1 << 20) / min; + else + weight[i] = INT16_MAX; + } + + /* Normalize */ + max = 0; + for (i = 0; i < LPC_ORDER; i++) + max = FFMAX(weight[i], max); + + shift = ff_g723_1_normalize_bits(max, 15); + for (i = 0; i < LPC_ORDER; i++) { + weight[i] <<= shift; + } + + /* Compute the VQ target vector */ + for (i = 0; i < LPC_ORDER; i++) { + lsp[i] -= dc_lsp[i] + + (((prev_lsp[i] - dc_lsp[i]) * 12288 + (1 << 14)) >> 15); + } + + get_index(0, 0, 3); + get_index(1, 3, 3); + get_index(2, 6, 4); +} + +/** + * Perform IIR filtering. + * + * @param fir_coef FIR coefficients + * @param iir_coef IIR coefficients + * @param src source vector + * @param dest destination vector + */ +static void iir_filter(int16_t *fir_coef, int16_t *iir_coef, + int16_t *src, int16_t *dest) +{ + int m, n; + + for (m = 0; m < SUBFRAME_LEN; m++) { + int64_t filter = 0; + for (n = 1; n <= LPC_ORDER; n++) { + filter -= fir_coef[n - 1] * src[m - n] - + iir_coef[n - 1] * dest[m - n]; + } + + dest[m] = av_clipl_int32((src[m] << 16) + (filter << 3) + + (1 << 15)) >> 16; + } +} + +/** + * Apply the formant perceptual weighting filter. + * + * @param flt_coef filter coefficients + * @param unq_lpc unquantized lpc vector + */ +static void perceptual_filter(G723_1_Context *p, int16_t *flt_coef, + int16_t *unq_lpc, int16_t *buf) +{ + int16_t vector[FRAME_LEN + LPC_ORDER]; + int i, j, k, l = 0; + + memcpy(buf, p->iir_mem, sizeof(int16_t) * LPC_ORDER); + memcpy(vector, p->fir_mem, sizeof(int16_t) * LPC_ORDER); + memcpy(vector + LPC_ORDER, buf + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); + + for (i = LPC_ORDER, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) { + for (k = 0; k < LPC_ORDER; k++) { + flt_coef[k + 2 * l] = (unq_lpc[k + l] * percept_flt_tbl[0][k] + + (1 << 14)) >> 15; + flt_coef[k + 2 * l + LPC_ORDER] = (unq_lpc[k + l] * + percept_flt_tbl[1][k] + + (1 << 14)) >> 15; + } + iir_filter(flt_coef + 2 * l, flt_coef + 2 * l + LPC_ORDER, + vector + i, buf + i); + l += LPC_ORDER; + } + memcpy(p->iir_mem, buf + FRAME_LEN, sizeof(int16_t) * LPC_ORDER); + memcpy(p->fir_mem, vector + FRAME_LEN, sizeof(int16_t) * LPC_ORDER); +} + +/** + * Estimate the open loop pitch period. + * + * @param buf perceptually weighted speech + * @param start estimation is carried out from this position + */ +static int estimate_pitch(int16_t *buf, int start) +{ + int max_exp = 32; + int max_ccr = 0x4000; + int max_eng = 0x7fff; + int index = PITCH_MIN; + int offset = start - PITCH_MIN + 1; + + int ccr, eng, orig_eng, ccr_eng, exp; + int diff, temp; + + int i; + + orig_eng = ff_dot_product(buf + offset, buf + offset, HALF_FRAME_LEN); + + for (i = PITCH_MIN; i <= PITCH_MAX - 3; i++) { + offset--; + + /* Update energy and compute correlation */ + orig_eng += buf[offset] * buf[offset] - + buf[offset + HALF_FRAME_LEN] * buf[offset + HALF_FRAME_LEN]; + ccr = ff_dot_product(buf + start, buf + offset, HALF_FRAME_LEN); + if (ccr <= 0) + continue; + + /* Split into mantissa and exponent to maintain precision */ + exp = ff_g723_1_normalize_bits(ccr, 31); + ccr = av_clipl_int32((int64_t) (ccr << exp) + (1 << 15)) >> 16; + exp <<= 1; + ccr *= ccr; + temp = ff_g723_1_normalize_bits(ccr, 31); + ccr = ccr << temp >> 16; + exp += temp; + + temp = ff_g723_1_normalize_bits(orig_eng, 31); + eng = av_clipl_int32((int64_t) (orig_eng << temp) + (1 << 15)) >> 16; + exp -= temp; + + if (ccr >= eng) { + exp--; + ccr >>= 1; + } + if (exp > max_exp) + continue; + + if (exp + 1 < max_exp) + goto update; + + /* Equalize exponents before comparison */ + if (exp + 1 == max_exp) + temp = max_ccr >> 1; + else + temp = max_ccr; + ccr_eng = ccr * max_eng; + diff = ccr_eng - eng * temp; + if (diff > 0 && (i - index < PITCH_MIN || diff > ccr_eng >> 2)) { +update: + index = i; + max_exp = exp; + max_ccr = ccr; + max_eng = eng; + } + } + return index; +} + +/** + * Compute harmonic noise filter parameters. + * + * @param buf perceptually weighted speech + * @param pitch_lag open loop pitch period + * @param hf harmonic filter parameters + */ +static void comp_harmonic_coeff(int16_t *buf, int16_t pitch_lag, HFParam *hf) +{ + int ccr, eng, max_ccr, max_eng; + int exp, max, diff; + int energy[15]; + int i, j; + + for (i = 0, j = pitch_lag - 3; j <= pitch_lag + 3; i++, j++) { + /* Compute residual energy */ + energy[i << 1] = ff_dot_product(buf - j, buf - j, SUBFRAME_LEN); + /* Compute correlation */ + energy[(i << 1) + 1] = ff_dot_product(buf, buf - j, SUBFRAME_LEN); + } + + /* Compute target energy */ + energy[14] = ff_dot_product(buf, buf, SUBFRAME_LEN); + + /* Normalize */ + max = 0; + for (i = 0; i < 15; i++) + max = FFMAX(max, FFABS(energy[i])); + + exp = ff_g723_1_normalize_bits(max, 31); + for (i = 0; i < 15; i++) { + energy[i] = av_clipl_int32((int64_t)(energy[i] << exp) + + (1 << 15)) >> 16; + } + + hf->index = -1; + hf->gain = 0; + max_ccr = 1; + max_eng = 0x7fff; + + for (i = 0; i <= 6; i++) { + eng = energy[i << 1]; + ccr = energy[(i << 1) + 1]; + + if (ccr <= 0) + continue; + + ccr = (ccr * ccr + (1 << 14)) >> 15; + diff = ccr * max_eng - eng * max_ccr; + if (diff > 0) { + max_ccr = ccr; + max_eng = eng; + hf->index = i; + } + } + + if (hf->index == -1) { + hf->index = pitch_lag; + return; + } + + eng = energy[14] * max_eng; + eng = (eng >> 2) + (eng >> 3); + ccr = energy[(hf->index << 1) + 1] * energy[(hf->index << 1) + 1]; + if (eng < ccr) { + eng = energy[(hf->index << 1) + 1]; + + if (eng >= max_eng) + hf->gain = 0x2800; + else + hf->gain = ((eng << 15) / max_eng * 0x2800 + (1 << 14)) >> 15; + } + hf->index += pitch_lag - 3; +} + +/** + * Apply the harmonic noise shaping filter. + * + * @param hf filter parameters + */ +static void harmonic_filter(HFParam *hf, const int16_t *src, int16_t *dest) +{ + int i; + + for (i = 0; i < SUBFRAME_LEN; i++) { + int64_t temp = hf->gain * src[i - hf->index] << 1; + dest[i] = av_clipl_int32((src[i] << 16) - temp + (1 << 15)) >> 16; + } +} + +static void harmonic_noise_sub(HFParam *hf, const int16_t *src, int16_t *dest) +{ + int i; + for (i = 0; i < SUBFRAME_LEN; i++) { + int64_t temp = hf->gain * src[i - hf->index] << 1; + dest[i] = av_clipl_int32(((dest[i] - src[i]) << 16) + temp + + (1 << 15)) >> 16; + } +} + +/** + * Combined synthesis and formant perceptual weighting filer. + * + * @param qnt_lpc quantized lpc coefficients + * @param perf_lpc perceptual filter coefficients + * @param perf_fir perceptual filter fir memory + * @param perf_iir perceptual filter iir memory + * @param scale the filter output will be scaled by 2^scale + */ +static void synth_percept_filter(int16_t *qnt_lpc, int16_t *perf_lpc, + int16_t *perf_fir, int16_t *perf_iir, + const int16_t *src, int16_t *dest, int scale) +{ + int i, j; + int16_t buf_16[SUBFRAME_LEN + LPC_ORDER]; + int64_t buf[SUBFRAME_LEN]; + + int16_t *bptr_16 = buf_16 + LPC_ORDER; + + memcpy(buf_16, perf_fir, sizeof(int16_t) * LPC_ORDER); + memcpy(dest - LPC_ORDER, perf_iir, sizeof(int16_t) * LPC_ORDER); + + for (i = 0; i < SUBFRAME_LEN; i++) { + int64_t temp = 0; + for (j = 1; j <= LPC_ORDER; j++) + temp -= qnt_lpc[j - 1] * bptr_16[i - j]; + + buf[i] = (src[i] << 15) + (temp << 3); + bptr_16[i] = av_clipl_int32(buf[i] + (1 << 15)) >> 16; + } + + for (i = 0; i < SUBFRAME_LEN; i++) { + int64_t fir = 0, iir = 0; + for (j = 1; j <= LPC_ORDER; j++) { + fir -= perf_lpc[j - 1] * bptr_16[i - j]; + iir += perf_lpc[j + LPC_ORDER - 1] * dest[i - j]; + } + dest[i] = av_clipl_int32(((buf[i] + (fir << 3)) << scale) + (iir << 3) + + (1 << 15)) >> 16; + } + memcpy(perf_fir, buf_16 + SUBFRAME_LEN, sizeof(int16_t) * LPC_ORDER); + memcpy(perf_iir, dest + SUBFRAME_LEN - LPC_ORDER, + sizeof(int16_t) * LPC_ORDER); +} + +/** + * Compute the adaptive codebook contribution. + * + * @param buf input signal + * @param index the current subframe index + */ +static void acb_search(G723_1_Context *p, int16_t *residual, + int16_t *impulse_resp, const int16_t *buf, + int index) +{ + int16_t flt_buf[PITCH_ORDER][SUBFRAME_LEN]; + + const int16_t *cb_tbl = adaptive_cb_gain85; + + int ccr_buf[PITCH_ORDER * SUBFRAMES << 2]; + + int pitch_lag = p->pitch_lag[index >> 1]; + int acb_lag = 1; + int acb_gain = 0; + int odd_frame = index & 1; + int iter = 3 + odd_frame; + int count = 0; + int tbl_size = 85; + + int i, j, k, l, max; + int64_t temp; + + if (!odd_frame) { + if (pitch_lag == PITCH_MIN) + pitch_lag++; + else + pitch_lag = FFMIN(pitch_lag, PITCH_MAX - 5); + } + + for (i = 0; i < iter; i++) { + ff_g723_1_get_residual(residual, p->prev_excitation, pitch_lag + i - 1); + + for (j = 0; j < SUBFRAME_LEN; j++) { + temp = 0; + for (k = 0; k <= j; k++) + temp += residual[PITCH_ORDER - 1 + k] * impulse_resp[j - k]; + flt_buf[PITCH_ORDER - 1][j] = av_clipl_int32((temp << 1) + + (1 << 15)) >> 16; + } + + for (j = PITCH_ORDER - 2; j >= 0; j--) { + flt_buf[j][0] = ((residual[j] << 13) + (1 << 14)) >> 15; + for (k = 1; k < SUBFRAME_LEN; k++) { + temp = (flt_buf[j + 1][k - 1] << 15) + + residual[j] * impulse_resp[k]; + flt_buf[j][k] = av_clipl_int32((temp << 1) + (1 << 15)) >> 16; + } + } + + /* Compute crosscorrelation with the signal */ + for (j = 0; j < PITCH_ORDER; j++) { + temp = ff_dot_product(buf, flt_buf[j], SUBFRAME_LEN); + ccr_buf[count++] = av_clipl_int32(temp << 1); + } + + /* Compute energies */ + for (j = 0; j < PITCH_ORDER; j++) { + ccr_buf[count++] = ff_g723_1_dot_product(flt_buf[j], flt_buf[j], + SUBFRAME_LEN); + } + + for (j = 1; j < PITCH_ORDER; j++) { + for (k = 0; k < j; k++) { + temp = ff_dot_product(flt_buf[j], flt_buf[k], SUBFRAME_LEN); + ccr_buf[count++] = av_clipl_int32(temp << 2); + } + } + } + + /* Normalize and shorten */ + max = 0; + for (i = 0; i < 20 * iter; i++) + max = FFMAX(max, FFABS(ccr_buf[i])); + + temp = ff_g723_1_normalize_bits(max, 31); + + for (i = 0; i < 20 * iter; i++) + ccr_buf[i] = av_clipl_int32((int64_t) (ccr_buf[i] << temp) + + (1 << 15)) >> 16; + + max = 0; + for (i = 0; i < iter; i++) { + /* Select quantization table */ + if (!odd_frame && pitch_lag + i - 1 >= SUBFRAME_LEN - 2 || + odd_frame && pitch_lag >= SUBFRAME_LEN - 2) { + cb_tbl = adaptive_cb_gain170; + tbl_size = 170; + } + + for (j = 0, k = 0; j < tbl_size; j++, k += 20) { + temp = 0; + for (l = 0; l < 20; l++) + temp += ccr_buf[20 * i + l] * cb_tbl[k + l]; + temp = av_clipl_int32(temp); + + if (temp > max) { + max = temp; + acb_gain = j; + acb_lag = i; + } + } + } + + if (!odd_frame) { + pitch_lag += acb_lag - 1; + acb_lag = 1; + } + + p->pitch_lag[index >> 1] = pitch_lag; + p->subframe[index].ad_cb_lag = acb_lag; + p->subframe[index].ad_cb_gain = acb_gain; +} + +/** + * Subtract the adaptive codebook contribution from the input + * to obtain the residual. + * + * @param buf target vector + */ +static void sub_acb_contrib(const int16_t *residual, const int16_t *impulse_resp, + int16_t *buf) +{ + int i, j; + /* Subtract adaptive CB contribution to obtain the residual */ + for (i = 0; i < SUBFRAME_LEN; i++) { + int64_t temp = buf[i] << 14; + for (j = 0; j <= i; j++) + temp -= residual[j] * impulse_resp[i - j]; + + buf[i] = av_clipl_int32((temp << 2) + (1 << 15)) >> 16; + } +} + +/** + * Quantize the residual signal using the fixed codebook (MP-MLQ). + * + * @param optim optimized fixed codebook parameters + * @param buf excitation vector + */ +static void get_fcb_param(FCBParam *optim, int16_t *impulse_resp, + int16_t *buf, int pulse_cnt, int pitch_lag) +{ + FCBParam param; + int16_t impulse_r[SUBFRAME_LEN]; + int16_t temp_corr[SUBFRAME_LEN]; + int16_t impulse_corr[SUBFRAME_LEN]; + + int ccr1[SUBFRAME_LEN]; + int ccr2[SUBFRAME_LEN]; + int amp, err, max, max_amp_index, min, scale, i, j, k, l; + + int64_t temp; + + /* Update impulse response */ + memcpy(impulse_r, impulse_resp, sizeof(int16_t) * SUBFRAME_LEN); + param.dirac_train = 0; + if (pitch_lag < SUBFRAME_LEN - 2) { + param.dirac_train = 1; + ff_g723_1_gen_dirac_train(impulse_r, pitch_lag); + } + + for (i = 0; i < SUBFRAME_LEN; i++) + temp_corr[i] = impulse_r[i] >> 1; + + /* Compute impulse response autocorrelation */ + temp = ff_g723_1_dot_product(temp_corr, temp_corr, SUBFRAME_LEN); + + scale = ff_g723_1_normalize_bits(temp, 31); + impulse_corr[0] = av_clipl_int32((temp << scale) + (1 << 15)) >> 16; + + for (i = 1; i < SUBFRAME_LEN; i++) { + temp = ff_g723_1_dot_product(temp_corr + i, temp_corr, + SUBFRAME_LEN - i); + impulse_corr[i] = av_clipl_int32((temp << scale) + (1 << 15)) >> 16; + } + + /* Compute crosscorrelation of impulse response with residual signal */ + scale -= 4; + for (i = 0; i < SUBFRAME_LEN; i++) { + temp = ff_g723_1_dot_product(buf + i, impulse_r, SUBFRAME_LEN - i); + if (scale < 0) + ccr1[i] = temp >> -scale; + else + ccr1[i] = av_clipl_int32(temp << scale); + } + + /* Search loop */ + for (i = 0; i < GRID_SIZE; i++) { + /* Maximize the crosscorrelation */ + max = 0; + for (j = i; j < SUBFRAME_LEN; j += GRID_SIZE) { + temp = FFABS(ccr1[j]); + if (temp >= max) { + max = temp; + param.pulse_pos[0] = j; + } + } + + /* Quantize the gain (max crosscorrelation/impulse_corr[0]) */ + amp = max; + min = 1 << 30; + max_amp_index = GAIN_LEVELS - 2; + for (j = max_amp_index; j >= 2; j--) { + temp = av_clipl_int32((int64_t) fixed_cb_gain[j] * + impulse_corr[0] << 1); + temp = FFABS(temp - amp); + if (temp < min) { + min = temp; + max_amp_index = j; + } + } + + max_amp_index--; + /* Select additional gain values */ + for (j = 1; j < 5; j++) { + for (k = i; k < SUBFRAME_LEN; k += GRID_SIZE) { + temp_corr[k] = 0; + ccr2[k] = ccr1[k]; + } + param.amp_index = max_amp_index + j - 2; + amp = fixed_cb_gain[param.amp_index]; + + param.pulse_sign[0] = (ccr2[param.pulse_pos[0]] < 0) ? -amp : amp; + temp_corr[param.pulse_pos[0]] = 1; + + for (k = 1; k < pulse_cnt; k++) { + max = INT_MIN; + for (l = i; l < SUBFRAME_LEN; l += GRID_SIZE) { + if (temp_corr[l]) + continue; + temp = impulse_corr[FFABS(l - param.pulse_pos[k - 1])]; + temp = av_clipl_int32((int64_t) temp * + param.pulse_sign[k - 1] << 1); + ccr2[l] -= temp; + temp = FFABS(ccr2[l]); + if (temp > max) { + max = temp; + param.pulse_pos[k] = l; + } + } + + param.pulse_sign[k] = (ccr2[param.pulse_pos[k]] < 0) ? + -amp : amp; + temp_corr[param.pulse_pos[k]] = 1; + } + + /* Create the error vector */ + memset(temp_corr, 0, sizeof(int16_t) * SUBFRAME_LEN); + + for (k = 0; k < pulse_cnt; k++) + temp_corr[param.pulse_pos[k]] = param.pulse_sign[k]; + + for (k = SUBFRAME_LEN - 1; k >= 0; k--) { + temp = 0; + for (l = 0; l <= k; l++) { + int prod = av_clipl_int32((int64_t) temp_corr[l] * + impulse_r[k - l] << 1); + temp = av_clipl_int32(temp + prod); + } + temp_corr[k] = temp << 2 >> 16; + } + + /* Compute square of error */ + err = 0; + for (k = 0; k < SUBFRAME_LEN; k++) { + int64_t prod; + prod = av_clipl_int32((int64_t) buf[k] * temp_corr[k] << 1); + err = av_clipl_int32(err - prod); + prod = av_clipl_int32((int64_t) temp_corr[k] * temp_corr[k]); + err = av_clipl_int32(err + prod); + } + + /* Minimize */ + if (err < optim->min_err) { + optim->min_err = err; + optim->grid_index = i; + optim->amp_index = param.amp_index; + optim->dirac_train = param.dirac_train; + + for (k = 0; k < pulse_cnt; k++) { + optim->pulse_sign[k] = param.pulse_sign[k]; + optim->pulse_pos[k] = param.pulse_pos[k]; + } + } + } + } +} + +/** + * Encode the pulse position and gain of the current subframe. + * + * @param optim optimized fixed CB parameters + * @param buf excitation vector + */ +static void pack_fcb_param(G723_1_Subframe *subfrm, FCBParam *optim, + int16_t *buf, int pulse_cnt) +{ + int i, j; + + j = PULSE_MAX - pulse_cnt; + + subfrm->pulse_sign = 0; + subfrm->pulse_pos = 0; + + for (i = 0; i < SUBFRAME_LEN >> 1; i++) { + int val = buf[optim->grid_index + (i << 1)]; + if (!val) { + subfrm->pulse_pos += combinatorial_table[j][i]; + } else { + subfrm->pulse_sign <<= 1; + if (val < 0) + subfrm->pulse_sign++; + j++; + + if (j == PULSE_MAX) + break; + } + } + subfrm->amp_index = optim->amp_index; + subfrm->grid_index = optim->grid_index; + subfrm->dirac_train = optim->dirac_train; +} + +/** + * Compute the fixed codebook excitation. + * + * @param buf target vector + * @param impulse_resp impulse response of the combined filter + */ +static void fcb_search(G723_1_Context *p, int16_t *impulse_resp, + int16_t *buf, int index) +{ + FCBParam optim; + int pulse_cnt = pulses[index]; + int i; + + optim.min_err = 1 << 30; + get_fcb_param(&optim, impulse_resp, buf, pulse_cnt, SUBFRAME_LEN); + + if (p->pitch_lag[index >> 1] < SUBFRAME_LEN - 2) { + get_fcb_param(&optim, impulse_resp, buf, pulse_cnt, + p->pitch_lag[index >> 1]); + } + + /* Reconstruct the excitation */ + memset(buf, 0, sizeof(int16_t) * SUBFRAME_LEN); + for (i = 0; i < pulse_cnt; i++) + buf[optim.pulse_pos[i]] = optim.pulse_sign[i]; + + pack_fcb_param(&p->subframe[index], &optim, buf, pulse_cnt); + + if (optim.dirac_train) + ff_g723_1_gen_dirac_train(buf, p->pitch_lag[index >> 1]); +} + +/** + * Pack the frame parameters into output bitstream. + * + * @param frame output buffer + * @param size size of the buffer + */ +static int pack_bitstream(G723_1_Context *p, AVPacket *avpkt) +{ + PutBitContext pb; + int info_bits = 0; + int i, temp; + + init_put_bits(&pb, avpkt->data, avpkt->size); + + put_bits(&pb, 2, info_bits); + + put_bits(&pb, 8, p->lsp_index[2]); + put_bits(&pb, 8, p->lsp_index[1]); + put_bits(&pb, 8, p->lsp_index[0]); + + put_bits(&pb, 7, p->pitch_lag[0] - PITCH_MIN); + put_bits(&pb, 2, p->subframe[1].ad_cb_lag); + put_bits(&pb, 7, p->pitch_lag[1] - PITCH_MIN); + put_bits(&pb, 2, p->subframe[3].ad_cb_lag); + + /* Write 12 bit combined gain */ + for (i = 0; i < SUBFRAMES; i++) { + temp = p->subframe[i].ad_cb_gain * GAIN_LEVELS + + p->subframe[i].amp_index; + if (p->cur_rate == RATE_6300) + temp += p->subframe[i].dirac_train << 11; + put_bits(&pb, 12, temp); + } + + put_bits(&pb, 1, p->subframe[0].grid_index); + put_bits(&pb, 1, p->subframe[1].grid_index); + put_bits(&pb, 1, p->subframe[2].grid_index); + put_bits(&pb, 1, p->subframe[3].grid_index); + + if (p->cur_rate == RATE_6300) { + skip_put_bits(&pb, 1); /* reserved bit */ + + /* Write 13 bit combined position index */ + temp = (p->subframe[0].pulse_pos >> 16) * 810 + + (p->subframe[1].pulse_pos >> 14) * 90 + + (p->subframe[2].pulse_pos >> 16) * 9 + + (p->subframe[3].pulse_pos >> 14); + put_bits(&pb, 13, temp); + + put_bits(&pb, 16, p->subframe[0].pulse_pos & 0xffff); + put_bits(&pb, 14, p->subframe[1].pulse_pos & 0x3fff); + put_bits(&pb, 16, p->subframe[2].pulse_pos & 0xffff); + put_bits(&pb, 14, p->subframe[3].pulse_pos & 0x3fff); + + put_bits(&pb, 6, p->subframe[0].pulse_sign); + put_bits(&pb, 5, p->subframe[1].pulse_sign); + put_bits(&pb, 6, p->subframe[2].pulse_sign); + put_bits(&pb, 5, p->subframe[3].pulse_sign); + } + + flush_put_bits(&pb); + return frame_size[info_bits]; +} + +static int g723_1_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, + const AVFrame *frame, int *got_packet_ptr) +{ + G723_1_Context *p = avctx->priv_data; + int16_t unq_lpc[LPC_ORDER * SUBFRAMES]; + int16_t qnt_lpc[LPC_ORDER * SUBFRAMES]; + int16_t cur_lsp[LPC_ORDER]; + int16_t weighted_lpc[LPC_ORDER * SUBFRAMES << 1]; + int16_t vector[FRAME_LEN + PITCH_MAX]; + int offset, ret, i, j; + int16_t *in, *start; + HFParam hf[4]; + + /* duplicate input */ + start = in = av_malloc(frame->nb_samples * sizeof(int16_t)); + if (!in) + return AVERROR(ENOMEM); + memcpy(in, frame->data[0], frame->nb_samples * sizeof(int16_t)); + + highpass_filter(in, &p->hpf_fir_mem, &p->hpf_iir_mem); + + memcpy(vector, p->prev_data, HALF_FRAME_LEN * sizeof(int16_t)); + memcpy(vector + HALF_FRAME_LEN, in, FRAME_LEN * sizeof(int16_t)); + + comp_lpc_coeff(vector, unq_lpc); + lpc2lsp(&unq_lpc[LPC_ORDER * 3], p->prev_lsp, cur_lsp); + lsp_quantize(p->lsp_index, cur_lsp, p->prev_lsp); + + /* Update memory */ + memcpy(vector + LPC_ORDER, p->prev_data + SUBFRAME_LEN, + sizeof(int16_t) * SUBFRAME_LEN); + memcpy(vector + LPC_ORDER + SUBFRAME_LEN, in, + sizeof(int16_t) * (HALF_FRAME_LEN + SUBFRAME_LEN)); + memcpy(p->prev_data, in + HALF_FRAME_LEN, + sizeof(int16_t) * HALF_FRAME_LEN); + memcpy(in, vector + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); + + perceptual_filter(p, weighted_lpc, unq_lpc, vector); + + memcpy(in, vector + LPC_ORDER, sizeof(int16_t) * FRAME_LEN); + memcpy(vector, p->prev_weight_sig, sizeof(int16_t) * PITCH_MAX); + memcpy(vector + PITCH_MAX, in, sizeof(int16_t) * FRAME_LEN); + + ff_g723_1_scale_vector(vector, vector, FRAME_LEN + PITCH_MAX); + + p->pitch_lag[0] = estimate_pitch(vector, PITCH_MAX); + p->pitch_lag[1] = estimate_pitch(vector, PITCH_MAX + HALF_FRAME_LEN); + + for (i = PITCH_MAX, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) + comp_harmonic_coeff(vector + i, p->pitch_lag[j >> 1], hf + j); + + memcpy(vector, p->prev_weight_sig, sizeof(int16_t) * PITCH_MAX); + memcpy(vector + PITCH_MAX, in, sizeof(int16_t) * FRAME_LEN); + memcpy(p->prev_weight_sig, vector + FRAME_LEN, sizeof(int16_t) * PITCH_MAX); + + for (i = 0, j = 0; j < SUBFRAMES; i += SUBFRAME_LEN, j++) + harmonic_filter(hf + j, vector + PITCH_MAX + i, in + i); + + ff_g723_1_inverse_quant(cur_lsp, p->prev_lsp, p->lsp_index, 0); + ff_g723_1_lsp_interpolate(qnt_lpc, cur_lsp, p->prev_lsp); + + memcpy(p->prev_lsp, cur_lsp, sizeof(int16_t) * LPC_ORDER); + + offset = 0; + for (i = 0; i < SUBFRAMES; i++) { + int16_t impulse_resp[SUBFRAME_LEN]; + int16_t residual[SUBFRAME_LEN + PITCH_ORDER - 1]; + int16_t flt_in[SUBFRAME_LEN]; + int16_t zero[LPC_ORDER], fir[LPC_ORDER], iir[LPC_ORDER]; + + /** + * Compute the combined impulse response of the synthesis filter, + * formant perceptual weighting filter and harmonic noise shaping filter + */ + memset(zero, 0, sizeof(int16_t) * LPC_ORDER); + memset(vector, 0, sizeof(int16_t) * PITCH_MAX); + memset(flt_in, 0, sizeof(int16_t) * SUBFRAME_LEN); + + flt_in[0] = 1 << 13; /* Unit impulse */ + synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), + zero, zero, flt_in, vector + PITCH_MAX, 1); + harmonic_filter(hf + i, vector + PITCH_MAX, impulse_resp); + + /* Compute the combined zero input response */ + flt_in[0] = 0; + memcpy(fir, p->perf_fir_mem, sizeof(int16_t) * LPC_ORDER); + memcpy(iir, p->perf_iir_mem, sizeof(int16_t) * LPC_ORDER); + + synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), + fir, iir, flt_in, vector + PITCH_MAX, 0); + memcpy(vector, p->harmonic_mem, sizeof(int16_t) * PITCH_MAX); + harmonic_noise_sub(hf + i, vector + PITCH_MAX, in); + + acb_search(p, residual, impulse_resp, in, i); + ff_g723_1_gen_acb_excitation(residual, p->prev_excitation, + p->pitch_lag[i >> 1], &p->subframe[i], + p->cur_rate); + sub_acb_contrib(residual, impulse_resp, in); + + fcb_search(p, impulse_resp, in, i); + + /* Reconstruct the excitation */ + ff_g723_1_gen_acb_excitation(impulse_resp, p->prev_excitation, + p->pitch_lag[i >> 1], &p->subframe[i], + RATE_6300); + + memmove(p->prev_excitation, p->prev_excitation + SUBFRAME_LEN, + sizeof(int16_t) * (PITCH_MAX - SUBFRAME_LEN)); + for (j = 0; j < SUBFRAME_LEN; j++) + in[j] = av_clip_int16((in[j] << 1) + impulse_resp[j]); + memcpy(p->prev_excitation + PITCH_MAX - SUBFRAME_LEN, in, + sizeof(int16_t) * SUBFRAME_LEN); + + /* Update filter memories */ + synth_percept_filter(qnt_lpc + offset, weighted_lpc + (offset << 1), + p->perf_fir_mem, p->perf_iir_mem, + in, vector + PITCH_MAX, 0); + memmove(p->harmonic_mem, p->harmonic_mem + SUBFRAME_LEN, + sizeof(int16_t) * (PITCH_MAX - SUBFRAME_LEN)); + memcpy(p->harmonic_mem + PITCH_MAX - SUBFRAME_LEN, vector + PITCH_MAX, + sizeof(int16_t) * SUBFRAME_LEN); + + in += SUBFRAME_LEN; + offset += LPC_ORDER; + } + + av_free(start); + + if ((ret = ff_alloc_packet2(avctx, avpkt, 24, 0)) < 0) + return ret; + + *got_packet_ptr = 1; + avpkt->size = pack_bitstream(p, avpkt); + return 0; +} + +AVCodec ff_g723_1_encoder = { + .name = "g723_1", + .long_name = NULL_IF_CONFIG_SMALL("G.723.1"), + .type = AVMEDIA_TYPE_AUDIO, + .id = AV_CODEC_ID_G723_1, + .priv_data_size = sizeof(G723_1_Context), + .init = g723_1_encode_init, + .encode2 = g723_1_encode_frame, + .sample_fmts = (const enum AVSampleFormat[]) { + AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE + }, +};