diff options
Diffstat (limited to 'src/spec.c')
-rw-r--r-- | src/spec.c | 444 |
1 files changed, 248 insertions, 196 deletions
@@ -32,14 +32,46 @@ */ static int resolve_gain_offset(enum lc3_srate sr, int nbytes) { - int g_off = (nbytes * 8) / (10 * (1 + sr)); - return 105 + 5*(1 + sr) + LC3_MIN(g_off, 115); + int sr_ind = lc3_hr(sr) ? 4 + (sr - LC3_SRATE_48K_HR) : sr; + + int g_off = (nbytes * 8) / (10 * (1 + sr_ind)); + return LC3_MIN(sr >= LC3_SRATE_96K_HR ? 181 : 255, + 105 + 5*(1 + sr_ind) + LC3_MIN(g_off, 115)); +} + +/** + * Unquantize gain + * g_int Quantization gain value + * return Unquantized gain value + */ +static float unquantize_gain(int g_int) +{ + /* Unquantization gain table : + * G[i] = 10 ^ (i / 28) , i = [0..27] */ + + static const float iq_table[] = { + 1.00000000e+00, 1.08571112e+00, 1.17876863e+00, 1.27980221e+00, + 1.38949549e+00, 1.50859071e+00, 1.63789371e+00, 1.77827941e+00, + 1.93069773e+00, 2.09617999e+00, 2.27584593e+00, 2.47091123e+00, + 2.68269580e+00, 2.91263265e+00, 3.16227766e+00, 3.43332002e+00, + 3.72759372e+00, 4.04708995e+00, 4.39397056e+00, 4.77058270e+00, + 5.17947468e+00, 5.62341325e+00, 6.10540230e+00, 6.62870316e+00, + 7.19685673e+00, 7.81370738e+00, 8.48342898e+00, 9.21055318e+00 + }; + + float g = 1.f; + + for ( ; g_int < 0; g_int += 28, g *= 0.1f); + for ( ; g_int >= 28; g_int -= 28, g *= 10.f); + + return g * iq_table[g_int]; } /** * Global Gain Estimation * dt, sr Duration and samplerate of the frame * x Spectral coefficients + * nbytes Size of the frame * nbits_budget Number of bits available coding the spectrum * nbits_off Offset on the available bits, temporarily smoothed * g_off Gain index offset @@ -49,29 +81,65 @@ static int resolve_gain_offset(enum lc3_srate sr, int nbytes) */ LC3_HOT static int estimate_gain( enum lc3_dt dt, enum lc3_srate sr, const float *x, - int nbits_budget, float nbits_off, int g_off, bool *reset_off, int *g_min) + int nbytes, int nbits_budget, float nbits_off, int g_off, + bool *reset_off, int *g_min) { - int ne = LC3_NE(dt, sr) >> 2; - int e[LC3_MAX_NE]; + int n4 = lc3_ne(dt, sr) / 4; + union { float f; int32_t q16; } e[LC3_MAX_NE / 4]; + + /* --- Signal adaptative noise floor --- */ + + int reg_bits = 0; + float low_bits = 0; + + if (lc3_hr(sr)) { + int reg_c = (const int [LC3_NUM_DT][LC3_NUM_SRATE - LC3_SRATE_48K_HR]){ + [LC3_DT_2M5] = { -6, -6 }, + [LC3_DT_5M ] = { 0, 0 }, + [LC3_DT_10M] = { 2, 5 } + }[dt][sr - LC3_SRATE_48K_HR]; + + reg_bits = (8*nbytes * 4) / (125 * (1 + dt)); + reg_bits = LC3_CLIP(reg_bits + reg_c, 6, 23); + + float m0 = 1e-5f, m1 = 1e-5f, k = 0; + + for (int i = 0; i < n4; i++) { + m0 += fabsf(x[4*i + 0]), m1 += fabsf(x[4*i + 0]) * k++; + m0 += fabsf(x[4*i + 1]), m1 += fabsf(x[4*i + 1]) * k++; + m0 += fabsf(x[4*i + 2]), m1 += fabsf(x[4*i + 2]) * k++; + m0 += fabsf(x[4*i + 3]), m1 += fabsf(x[4*i + 3]) * k++; + } + + int m = roundf((1.6f * m0) / ((1 + dt) * m1)); + low_bits = 8 - LC3_MIN(m, 8); + } /* --- Energy (dB) by 4 MDCT blocks --- */ float x2_max = 0; - for (int i = 0; i < ne; i++, x += 4) { - float x0 = x[0] * x[0]; - float x1 = x[1] * x[1]; - float x2 = x[2] * x[2]; - float x3 = x[3] * x[3]; + for (int i = 0; i < n4; i++) { + float x0 = x[4*i + 0] * x[4*i + 0]; + float x1 = x[4*i + 1] * x[4*i + 1]; + float x2 = x[4*i + 2] * x[4*i + 2]; + float x3 = x[4*i + 3] * x[4*i + 3]; x2_max = fmaxf(x2_max, x0); x2_max = fmaxf(x2_max, x1); x2_max = fmaxf(x2_max, x2); x2_max = fmaxf(x2_max, x3); - e[i] = fast_db_q16(fmaxf(x0 + x1 + x2 + x3, 1e-10f)); + e[i].f = x0 + x1 + x2 + x3; } + float x_max = sqrtf(x2_max); + float nf = lc3_hr(sr) ? + lc3_ldexpf(x_max, -reg_bits) * lc3_exp2f(-low_bits) : 0; + + for (int i = 0; i < n4; i++) + e[i].q16 = lc3_db_q16(fmaxf(e[i].f + nf, 1e-10f)); + /* --- Determine gain index --- */ int nbits = nbits_budget + nbits_off + 0.5f; @@ -81,14 +149,14 @@ LC3_HOT static int estimate_gain( const int k_2u7 = 2.7f * 0x1p16f + 0.5f; const int k_1u4 = 1.4f * 0x1p16f + 0.5f; - for (int i = 128, j, j0 = ne-1, j1 ; i > 0; i >>= 1) { + for (int i = 128, j, j0 = n4-1, j1 ; i > 0; i >>= 1) { int gn = (g_int - i) * k_20_28; int v = 0; - for (j = j0; j >= 0 && e[j] < gn; j--); + for (j = j0; j >= 0 && e[j].q16 < gn; j--); for (j1 = j; j >= 0; j--) { - int e_diff = e[j] - gn; + int e_diff = e[j].q16 - gn; v += e_diff < 0 ? k_2u7 : e_diff < 43 << 16 ? e_diff + ( 7 << 16) @@ -103,10 +171,14 @@ LC3_HOT static int estimate_gain( /* --- Limit gain index --- */ - *g_min = x2_max == 0 ? -g_off : - ceilf(28 * log10f(sqrtf(x2_max) / (32768 - 0.375f))); + float x_lim = lc3_hr(sr) ? 0x7fffp8f : 0x7fffp0f; + + *g_min = 255 - g_off; + for (int i = 128 ; i > 0; i >>= 1) + if (x_lim * unquantize_gain(*g_min - i) > x_max) + *g_min -= i; - *reset_off = g_int < *g_min || x2_max == 0; + *reset_off = g_int < *g_min || x_max == 0; if (*reset_off) g_int = *g_min; @@ -115,21 +187,23 @@ LC3_HOT static int estimate_gain( /** * Global Gain Adjustment - * sr Samplerate of the frame + * dt, sr Duration and samplerate of the frame * g_idx The estimated quantized gain index * nbits Computed number of bits coding the spectrum * nbits_budget Number of bits available for coding the spectrum * g_idx_min Minimum gain index value * return Gain adjust value (-1 to 2) */ -LC3_HOT static int adjust_gain(enum lc3_srate sr, int g_idx, - int nbits, int nbits_budget, int g_idx_min) +LC3_HOT static int adjust_gain( + enum lc3_dt dt, enum lc3_srate sr, + int g_idx, int nbits, int nbits_budget, int g_idx_min) { /* --- Compute delta threshold --- */ const int *t = (const int [LC3_NUM_SRATE][3]){ { 80, 500, 850 }, { 230, 1025, 1700 }, { 380, 1550, 2550 }, - { 530, 2075, 3400 }, { 680, 2600, 4250 } + { 530, 2075, 3400 }, { 680, 2600, 4250 }, + { 680, 2600, 4250 }, { 830, 3125, 5100 } }[sr]; int delta, den = 48; @@ -150,84 +224,46 @@ LC3_HOT static int adjust_gain(enum lc3_srate sr, int g_idx, /* --- Adjust gain --- */ - if (nbits < nbits_budget - (delta + 2)) + if (lc3_hr(sr) && nbits > nbits_budget) { + int factor = 1 + (dt <= LC3_DT_5M) + + (dt <= LC3_DT_2M5) * (1 + (nbits >= 520)); + + int g_incr = factor + (factor * (nbits - nbits_budget)) / delta; + return LC3_MIN(g_idx + g_incr, 255) - g_idx; + } + + if (!lc3_hr(sr) && nbits < nbits_budget - (delta + 2)) return -(g_idx > g_idx_min); - if (nbits > nbits_budget) + if (!lc3_hr(sr) && nbits > nbits_budget) return (g_idx < 255) + (g_idx < 254 && nbits >= nbits_budget + delta); return 0; } /** - * Unquantize gain - * g_int Quantization gain value - * return Unquantized gain value - */ -static float unquantize_gain(int g_int) -{ - /* Unquantization gain table : - * G[i] = 10 ^ (i / 28) , i = [0..64] */ - - static const float iq_table[] = { - 1.00000000e+00, 1.08571112e+00, 1.17876863e+00, 1.27980221e+00, - 1.38949549e+00, 1.50859071e+00, 1.63789371e+00, 1.77827941e+00, - 1.93069773e+00, 2.09617999e+00, 2.27584593e+00, 2.47091123e+00, - 2.68269580e+00, 2.91263265e+00, 3.16227766e+00, 3.43332002e+00, - 3.72759372e+00, 4.04708995e+00, 4.39397056e+00, 4.77058270e+00, - 5.17947468e+00, 5.62341325e+00, 6.10540230e+00, 6.62870316e+00, - 7.19685673e+00, 7.81370738e+00, 8.48342898e+00, 9.21055318e+00, - 1.00000000e+01, 1.08571112e+01, 1.17876863e+01, 1.27980221e+01, - 1.38949549e+01, 1.50859071e+01, 1.63789371e+01, 1.77827941e+01, - 1.93069773e+01, 2.09617999e+01, 2.27584593e+01, 2.47091123e+01, - 2.68269580e+01, 2.91263265e+01, 3.16227766e+01, 3.43332002e+01, - 3.72759372e+01, 4.04708995e+01, 4.39397056e+01, 4.77058270e+01, - 5.17947468e+01, 5.62341325e+01, 6.10540230e+01, 6.62870316e+01, - 7.19685673e+01, 7.81370738e+01, 8.48342898e+01, 9.21055318e+01, - 1.00000000e+02, 1.08571112e+02, 1.17876863e+02, 1.27980221e+02, - 1.38949549e+02, 1.50859071e+02, 1.63789371e+02, 1.77827941e+02, - 1.93069773e+02 - }; - - float g = iq_table[LC3_ABS(g_int) & 0x3f]; - for(int n64 = LC3_ABS(g_int) >> 6; n64--; ) - g *= iq_table[64]; - - return g_int >= 0 ? g : 1 / g; -} - -/** * Spectrum quantization * dt, sr Duration and samplerate of the frame * g_int Quantization gain value * x Spectral coefficients, scaled as output - * xq, nq Output spectral quantized coefficients, and count - * - * The spectral coefficients `xq` are stored as : - * b0 0:positive or zero 1:negative - * b15..b1 Absolute value + * n Return count of significants */ -LC3_HOT static void quantize(enum lc3_dt dt, enum lc3_srate sr, - int g_int, float *x, uint16_t *xq, int *nq) +LC3_HOT static void quantize( + enum lc3_dt dt, enum lc3_srate sr, int g_int, float *x, int *n) { - float g_inv = 1 / unquantize_gain(g_int); - int ne = LC3_NE(dt, sr); + float g_inv = unquantize_gain(-g_int); + int ne = lc3_ne(dt, sr); - *nq = ne; + *n = ne; for (int i = 0; i < ne; i += 2) { - uint16_t x0, x1; + float xq_min = lc3_hr(sr) ? 0.5f : 10.f/16; x[i+0] *= g_inv; x[i+1] *= g_inv; - x0 = fminf(fabsf(x[i+0]) + 6.f/16, INT16_MAX); - x1 = fminf(fabsf(x[i+1]) + 6.f/16, INT16_MAX); - - xq[i+0] = (x0 << 1) + ((x0 > 0) & (x[i+0] < 0)); - xq[i+1] = (x1 << 1) + ((x1 > 0) & (x[i+1] < 0)); - - *nq = x0 || x1 ? ne : *nq - 2; + *n = fabsf(x[i+0]) >= xq_min || + fabsf(x[i+1]) >= xq_min ? ne : *n - 2; } } @@ -238,11 +274,12 @@ LC3_HOT static void quantize(enum lc3_dt dt, enum lc3_srate sr, * x, nq Spectral quantized, and count of significants * return Unquantized gain value */ -LC3_HOT static float unquantize(enum lc3_dt dt, enum lc3_srate sr, +LC3_HOT static float unquantize( + enum lc3_dt dt, enum lc3_srate sr, int g_int, float *x, int nq) { float g = unquantize_gain(g_int); - int i, ne = LC3_NE(dt, sr); + int i, ne = lc3_ne(dt, sr); for (i = 0; i < nq; i++) x[i] = x[i] * g; @@ -259,13 +296,19 @@ LC3_HOT static float unquantize(enum lc3_dt dt, enum lc3_srate sr, * -------------------------------------------------------------------------- */ /** - * Resolve High-bitrate mode according size of the frame + * Resolve High-bitrate and LSB modes according size of the frame * sr, nbytes Samplerate and size of the frame + * p_lsb_mode True when LSB mode allowed, when not NULL * return True when High-Rate mode enabled */ -static int resolve_high_rate(enum lc3_srate sr, int nbytes) +static bool resolve_modes(enum lc3_srate sr, int nbytes, bool *p_lsb_mode) { - return nbytes > 20 * (1 + (int)sr); + int sr_ind = lc3_hr(sr) ? 4 + (sr - LC3_SRATE_48K_HR) : sr; + + if (p_lsb_mode) + *p_lsb_mode = (nbytes >= 20 * (3 + sr_ind)) && (sr < LC3_SRATE_96K_HR); + + return (nbytes > 20 * (1 + sr_ind)) && (sr < LC3_SRATE_96K_HR); } /** @@ -276,21 +319,13 @@ static int resolve_high_rate(enum lc3_srate sr, int nbytes) * nbits_budget Truncate to stay in budget, when not zero * p_lsb_mode Return True when LSB's are not AC coded, or NULL * return The number of bits coding the spectrum - * - * The spectral coefficients `x` storage is : - * b0 0:positive or zero 1:negative - * b15..b1 Absolute value */ LC3_HOT static int compute_nbits( enum lc3_dt dt, enum lc3_srate sr, int nbytes, - const uint16_t *x, int *n, int nbits_budget, bool *p_lsb_mode) + const float *x, int *n, int nbits_budget, bool *p_lsb_mode) { - int ne = LC3_NE(dt, sr); - - /* --- Mode and rate --- */ - - bool lsb_mode = nbytes >= 20 * (3 + (int)sr); - bool high_rate = resolve_high_rate(sr, nbytes); + bool lsb_mode, high_rate = resolve_modes(sr, nbytes, &lsb_mode); + int ne = lc3_ne(dt, sr); /* --- Loop on quantized coefficients --- */ @@ -308,12 +343,15 @@ LC3_HOT static int compute_nbits( for ( ; i < LC3_MIN(*n, (ne + 2) >> (1 - h)) && nbits <= nbits_budget; i += 2) { + float xq_off = lc3_hr(sr) ? 0.5f : 6.f/16; + uint32_t a = fabsf(x[i+0]) + xq_off; + uint32_t b = fabsf(x[i+1]) + xq_off; + const uint8_t *lut = lut_coeff[state]; - uint16_t a = x[i] >> 1, b = x[i+1] >> 1; /* --- Sign values --- */ - int s = (a > 0) + (b > 0); + int s = (a != 0) + (b != 0); nbits += s * 2048; /* --- LSB values Reduce to 2*2 bits MSB values --- @@ -322,8 +360,8 @@ LC3_HOT static int compute_nbits( * The LSB mode does not arthmetic code the first LSB, * add the sign of the LSB when one of pair was at value 1 */ - int k = 0; - int m = (a | b) >> 2; + uint32_t m = (a | b) >> 2; + unsigned k = 0; if (m) { @@ -375,19 +413,15 @@ LC3_HOT static int compute_nbits( * Put quantized spectrum * bits Bitstream context * dt, sr, nbytes Duration, samplerate and size of the frame - * x Spectral quantized + * x Spectral quantized coefficients * nq, lsb_mode Count of significants, and LSB discard indication - * - * The spectral coefficients `x` storage is : - * b0 0:positive or zero 1:negative - * b15..b1 Absolute value */ LC3_HOT static void put_quantized(lc3_bits_t *bits, enum lc3_dt dt, enum lc3_srate sr, int nbytes, - const uint16_t *x, int nq, bool lsb_mode) + const float *x, int nq, bool lsb_mode) { - int ne = LC3_NE(dt, sr); - bool high_rate = resolve_high_rate(sr, nbytes); + bool high_rate = resolve_modes(sr, nbytes, NULL); + int ne = lc3_ne(dt, sr); /* --- Loop on quantized coefficients --- */ @@ -398,16 +432,19 @@ LC3_HOT static void put_quantized(lc3_bits_t *bits, for ( ; i < LC3_MIN(nq, (ne + 2) >> (1 - h)); i += 2) { + float xq_off = lc3_hr(sr) ? 0.5f : 6.f/16; + uint32_t a = fabsf(x[i+0]) + xq_off; + uint32_t b = fabsf(x[i+1]) + xq_off; + const uint8_t *lut = lut_coeff[state]; - uint16_t a = x[i] >> 1, b = x[i+1] >> 1; /* --- LSB values Reduce to 2*2 bits MSB values --- * Reduce to 2x2 bits MSB values. The LSB's pair are arithmetic * coded with an escape code and 1 bits for each values. * The LSB mode discard the first LSB (at this step) */ - int m = (a | b) >> 2; - int k = 0, shr = 0; + uint32_t m = (a | b) >> 2; + unsigned k = 0, shr = 0; if (m) { @@ -431,8 +468,8 @@ LC3_HOT static void put_quantized(lc3_bits_t *bits, /* --- Sign values --- */ - if (a) lc3_put_bit(bits, x[i+0] & 1); - if (b) lc3_put_bit(bits, x[i+1] & 1); + if (a) lc3_put_bit(bits, x[i+0] < 0); + if (b) lc3_put_bit(bits, x[i+1] < 0); /* --- MSB values --- */ @@ -453,18 +490,18 @@ LC3_HOT static void put_quantized(lc3_bits_t *bits, * bits Bitstream context * dt, sr, nbytes Duration, samplerate and size of the frame * nq, lsb_mode Count of significants, and LSB discard indication - * xq Return `nq` spectral quantized coefficients + * x Return `nq` spectral quantized coefficients * nf_seed Return the noise factor seed associated * return 0: Ok -1: Invalid bitstream data */ LC3_HOT static int get_quantized(lc3_bits_t *bits, enum lc3_dt dt, enum lc3_srate sr, int nbytes, - int nq, bool lsb_mode, float *xq, uint16_t *nf_seed) + int nq, bool lsb_mode, float *x, uint16_t *nf_seed) { - int ne = LC3_NE(dt, sr); - bool high_rate = resolve_high_rate(sr, nbytes); + bool high_rate = resolve_modes(sr, nbytes, NULL); + int ne = lc3_ne(dt, sr); - *nf_seed = 0; + *nf_seed = 0; /* --- Loop on quantized coefficients --- */ @@ -476,6 +513,7 @@ LC3_HOT static int get_quantized(lc3_bits_t *bits, for ( ; i < LC3_MIN(nq, (ne + 2) >> (1 - h)); i += 2) { const uint8_t *lut = lut_coeff[state]; + int max_shl = lc3_hr(sr) ? 22 : 14; /* --- LSB values --- * Until the symbol read indicates the escape value 16, @@ -492,7 +530,7 @@ LC3_HOT static int get_quantized(lc3_bits_t *bits, shl++; } - for ( ; s >= 16 && shl < 14; shl++) { + for ( ; s >= 16 && shl < max_shl; shl++) { u |= lc3_get_bit(bits) << shl; v |= lc3_get_bit(bits) << shl; @@ -511,10 +549,11 @@ LC3_HOT static int get_quantized(lc3_bits_t *bits, u |= a << shl; v |= b << shl; - xq[i ] = u && lc3_get_bit(bits) ? -u : u; - xq[i+1] = v && lc3_get_bit(bits) ? -v : v; + x[i+0] = u && lc3_get_bit(bits) ? -u : u; + x[i+1] = v && lc3_get_bit(bits) ? -v : v; - *nf_seed = (*nf_seed + u * i + v * (i+1)) & 0xffff; + *nf_seed = (*nf_seed + (u & 0x7fff) * (i ) + + (v & 0x7fff) * (i+1)) & 0xffff; /* --- Update state --- */ @@ -529,25 +568,30 @@ LC3_HOT static int get_quantized(lc3_bits_t *bits, * Put residual bits of quantization * bits Bitstream context * nbits Maximum number of bits to output + * hrmode High-Resolution mode * x, n Spectral quantized, and count of significants - * xf Scaled spectral coefficients - * - * The spectral coefficients `x` storage is : - * b0 0:positive or zero 1:negative - * b15..b1 Absolute value */ -LC3_HOT static void put_residual( - lc3_bits_t *bits, int nbits, const uint16_t *x, int n, const float *xf) +LC3_HOT static void put_residual(lc3_bits_t *bits, + int nbits, bool hrmode, float *x, int n) { - for (int i = 0; i < n && nbits > 0; i++) { + float xq_lim = hrmode ? 0.5f : 10.f/16; + float xq_off = xq_lim / 2; - if (x[i] == 0) - continue; + for (int iter = 0; iter < (hrmode ? 20 : 1) && nbits > 0; iter++) { + for (int i = 0; i < n && nbits > 0; i++) { - float xq = x[i] & 1 ? -(x[i] >> 1) : (x[i] >> 1); + float xr = fabsf(x[i]); + if (xr < xq_lim) + continue; - lc3_put_bit(bits, xf[i] >= xq); - nbits--; + bool b = (xr - truncf(xr) < xq_lim) ^ (x[i] < 0); + lc3_put_bit(bits, b); + nbits--; + + x[i] += b ? -xq_off : xq_off; + } + + xq_off *= xq_lim; } } @@ -555,22 +599,31 @@ LC3_HOT static void put_residual( * Get residual bits of quantization * bits Bitstream context * nbits Maximum number of bits to output + * hrmode High-Resolution mode * x, nq Spectral quantized, and count of significants */ -LC3_HOT static void get_residual( - lc3_bits_t *bits, int nbits, float *x, int nq) +LC3_HOT static void get_residual(lc3_bits_t *bits, + int nbits, bool hrmode, float *x, int n) { - for (int i = 0; i < nq && nbits > 0; i++) { + float xq_off_1 = hrmode ? 0.25f : 5.f/16; + float xq_off_2 = hrmode ? 0.25f : 3.f/16; - if (x[i] == 0) - continue; + for (int iter = 0; iter < (hrmode ? 20 : 1) && nbits > 0; iter++) { + for (int i = 0; i < n && nbits > 0; i++) { - if (lc3_get_bit(bits) == 0) - x[i] -= x[i] < 0 ? 5.f/16 : 3.f/16; - else - x[i] += x[i] > 0 ? 5.f/16 : 3.f/16; + if (x[i] == 0) + continue; - nbits--; + if (lc3_get_bit(bits) == 0) + x[i] -= x[i] < 0 ? xq_off_1 : xq_off_2; + else + x[i] += x[i] > 0 ? xq_off_1 : xq_off_2; + + nbits--; + } + + xq_off_1 *= 0.5f; + xq_off_2 *= 0.5f; } } @@ -578,18 +631,17 @@ LC3_HOT static void get_residual( * Put LSB values of quantized spectrum values * bits Bitstream context * nbits Maximum number of bits to output + * hrmode High-Resolution mode * x, n Spectral quantized, and count of significants - * - * The spectral coefficients `x` storage is : - * b0 0:positive or zero 1:negative - * b15..b1 Absolute value */ -LC3_HOT static void put_lsb( - lc3_bits_t *bits, int nbits, const uint16_t *x, int n) +LC3_HOT static void put_lsb(lc3_bits_t *bits, + int nbits, bool hrmode, const float *x, int n) { for (int i = 0; i < n && nbits > 0; i += 2) { - uint16_t a = x[i] >> 1, b = x[i+1] >> 1; - int a_neg = x[i] & 1, b_neg = x[i+1] & 1; + + float xq_off = hrmode ? 0.5f : 6.f/16; + uint32_t a = fabsf(x[i+0]) + xq_off; + uint32_t b = fabsf(x[i+1]) + xq_off; if ((a | b) >> 2 == 0) continue; @@ -598,13 +650,13 @@ LC3_HOT static void put_lsb( lc3_put_bit(bits, a & 1); if (a == 1 && nbits-- > 0) - lc3_put_bit(bits, a_neg); + lc3_put_bit(bits, x[i+0] < 0); if (nbits-- > 0) lc3_put_bit(bits, b & 1); if (b == 1 && nbits-- > 0) - lc3_put_bit(bits, b_neg); + lc3_put_bit(bits, x[i+1] < 0); } } @@ -655,34 +707,31 @@ LC3_HOT static void get_lsb(lc3_bits_t *bits, /** * Estimate noise level * dt, bw Duration and bandwidth of the frame - * xq, nq Quantized spectral coefficients - * x Quantization scaled spectrum coefficients + * hrmode High-Resolution mode + * x, n Spectral quantized, and count of significants * return Noise factor (0 to 7) - * - * The spectral coefficients `x` storage is : - * b0 0:positive or zero 1:negative - * b15..b1 Absolute value */ -LC3_HOT static int estimate_noise(enum lc3_dt dt, enum lc3_bandwidth bw, - const uint16_t *xq, int nq, const float *x) +LC3_HOT static int estimate_noise( + enum lc3_dt dt, enum lc3_bandwidth bw, bool hrmode, const float *x, int n) { - int bw_stop = (dt == LC3_DT_7M5 ? 60 : 80) * (1 + bw); - int w = 2 + dt; + int bw_stop = lc3_ne(dt, (enum lc3_srate)LC3_MIN(bw, LC3_BANDWIDTH_FB)); + int w = 1 + (dt >= LC3_DT_7M5) + (dt>= LC3_DT_10M); + float xq_lim = hrmode ? 0.5f : 10.f/16; float sum = 0; - int i, n = 0, z = 0; + int i, ns = 0, z = 0; - for (i = 6*(3 + dt) - w; i < LC3_MIN(nq, bw_stop); i++) { - z = xq[i] ? 0 : z + 1; + for (i = 6 * (1 + dt) - w; i < LC3_MIN(n, bw_stop); i++) { + z = fabsf(x[i]) < xq_lim ? z + 1 : 0; if (z > 2*w) - sum += fabsf(x[i - w]), n++; + sum += fabsf(x[i - w]), ns++; } for ( ; i < bw_stop + w; i++) if (++z > 2*w) - sum += fabsf(x[i - w]), n++; + sum += fabsf(x[i - w]), ns++; - int nf = n ? 8 - (int)((16 * sum) / n + 0.5f) : 0; + int nf = ns ? 8 - (int)((16 * sum) / ns + 0.5f) : 8; return LC3_CLIP(nf, 0, 7); } @@ -697,13 +746,13 @@ LC3_HOT static int estimate_noise(enum lc3_dt dt, enum lc3_bandwidth bw, LC3_HOT static void fill_noise(enum lc3_dt dt, enum lc3_bandwidth bw, int nf, uint16_t nf_seed, float g, float *x, int nq) { - int bw_stop = (dt == LC3_DT_7M5 ? 60 : 80) * (1 + bw); - int w = 2 + dt; + int bw_stop = lc3_ne(dt, (enum lc3_srate)LC3_MIN(bw, LC3_BANDWIDTH_FB)); + int w = 1 + (dt >= LC3_DT_7M5) + (dt>= LC3_DT_10M); float s = g * (float)(8 - nf) / 16; int i, z = 0; - for (i = 6*(3 + dt) - w; i < LC3_MIN(nq, bw_stop); i++) { + for (i = 6 * (1 + dt) - w; i < LC3_MIN(nq, bw_stop); i++) { z = x[i] ? 0 : z + 1; if (z > 2*w) { nf_seed = (13849 + nf_seed*31821) & 0xffff; @@ -745,13 +794,13 @@ static int get_noise_factor(lc3_bits_t *bits) /** * Bit consumption of the number of coded coefficients - * dt, sr Duration, samplerate of the frame + * dt, sr, nbytes Duration, samplerate and size of the frame * return Bit consumpution of the number of coded coefficients */ static int get_nbits_nq(enum lc3_dt dt, enum lc3_srate sr) { - int ne = LC3_NE(dt, sr); - return 4 + (ne > 32) + (ne > 64) + (ne > 128) + (ne > 256); + int ne = lc3_ne(dt, sr); + return 4 + (ne > 32) + (ne > 64) + (ne > 128) + (ne > 256) + (ne > 512); } /** @@ -761,16 +810,18 @@ static int get_nbits_nq(enum lc3_dt dt, enum lc3_srate sr) */ static int get_nbits_ac(enum lc3_dt dt, enum lc3_srate sr, int nbytes) { - return get_nbits_nq(dt, sr) + 3 + LC3_MIN((nbytes-1) / 160, 2); + return get_nbits_nq(dt, sr) + + 3 + lc3_hr(sr) + LC3_MIN((nbytes-1) / 160, 2); } /** * Spectrum analysis */ -void lc3_spec_analyze(enum lc3_dt dt, enum lc3_srate sr, - int nbytes, bool pitch, const lc3_tns_data_t *tns, - struct lc3_spec_analysis *spec, float *x, - uint16_t *xq, struct lc3_spec_side *side) +void lc3_spec_analyze( + enum lc3_dt dt, enum lc3_srate sr, int nbytes, + bool pitch, const lc3_tns_data_t *tns, + struct lc3_spec_analysis *spec, + float *x, struct lc3_spec_side *side) { bool reset_off; @@ -792,35 +843,36 @@ void lc3_spec_analyze(enum lc3_dt dt, enum lc3_srate sr, int g_off = resolve_gain_offset(sr, nbytes); int g_min, g_int = estimate_gain(dt, sr, - x, nbits_budget, nbits_off, g_off, &reset_off, &g_min); + x, nbytes, nbits_budget, nbits_off, g_off, &reset_off, &g_min); /* --- Quantization --- */ - quantize(dt, sr, g_int, x, xq, &side->nq); + quantize(dt, sr, g_int, x, &side->nq); - int nbits = compute_nbits(dt, sr, nbytes, xq, &side->nq, 0, NULL); + int nbits = compute_nbits(dt, sr, nbytes, x, &side->nq, 0, NULL); spec->nbits_off = reset_off ? 0 : nbits_off; spec->nbits_spare = reset_off ? 0 : nbits_budget - nbits; /* --- Adjust gain and requantize --- */ - int g_adj = adjust_gain(sr, g_off + g_int, - nbits, nbits_budget, g_off + g_min); + int g_adj = adjust_gain(dt, sr, + g_off + g_int, nbits, nbits_budget, g_off + g_min); if (g_adj) - quantize(dt, sr, g_adj, x, xq, &side->nq); + quantize(dt, sr, g_adj, x, &side->nq); side->g_idx = g_int + g_adj + g_off; nbits = compute_nbits(dt, sr, nbytes, - xq, &side->nq, nbits_budget, &side->lsb_mode); + x, &side->nq, nbits_budget, &side->lsb_mode); } /** * Put spectral quantization side data */ void lc3_spec_put_side(lc3_bits_t *bits, - enum lc3_dt dt, enum lc3_srate sr, const struct lc3_spec_side *side) + enum lc3_dt dt, enum lc3_srate sr, + const struct lc3_spec_side *side) { int nbits_nq = get_nbits_nq(dt, sr); @@ -833,22 +885,22 @@ void lc3_spec_put_side(lc3_bits_t *bits, * Encode spectral coefficients */ void lc3_spec_encode(lc3_bits_t *bits, - enum lc3_dt dt, enum lc3_srate sr, enum lc3_bandwidth bw, int nbytes, - const uint16_t *xq, const lc3_spec_side_t *side, const float *x) + enum lc3_dt dt, enum lc3_srate sr, enum lc3_bandwidth bw, + int nbytes, const lc3_spec_side_t *side, float *x) { bool lsb_mode = side->lsb_mode; int nq = side->nq; - put_noise_factor(bits, estimate_noise(dt, bw, xq, nq, x)); + put_noise_factor(bits, estimate_noise(dt, bw, lc3_hr(sr), x, nq)); - put_quantized(bits, dt, sr, nbytes, xq, nq, lsb_mode); + put_quantized(bits, dt, sr, nbytes, x, nq, lsb_mode); int nbits_left = lc3_get_bits_left(bits); if (lsb_mode) - put_lsb(bits, nbits_left, xq, nq); + put_lsb(bits, nbits_left, lc3_hr(sr), x, nq); else - put_residual(bits, nbits_left, xq, nq, x); + put_residual(bits, nbits_left, lc3_hr(sr), x, nq); } @@ -863,7 +915,7 @@ int lc3_spec_get_side(lc3_bits_t *bits, enum lc3_dt dt, enum lc3_srate sr, struct lc3_spec_side *side) { int nbits_nq = get_nbits_nq(dt, sr); - int ne = LC3_NE(dt, sr); + int ne = lc3_ne(dt, sr); side->nq = (lc3_get_bits(bits, nbits_nq) + 1) << 1; side->lsb_mode = lc3_get_bit(bits); @@ -895,7 +947,7 @@ int lc3_spec_decode(lc3_bits_t *bits, if (lsb_mode) get_lsb(bits, nbits_left, x, nq, &nf_seed); else - get_residual(bits, nbits_left, x, nq); + get_residual(bits, nbits_left, lc3_hr(sr), x, nq); int g_int = side->g_idx - resolve_gain_offset(sr, nbytes); float g = unquantize(dt, sr, g_int, x, nq); |