| /* |
| * AAC encoder quantizer |
| * Copyright (C) 2015 Rostislav Pehlivanov |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * AAC encoder quantizer |
| * @author Rostislav Pehlivanov ( atomnuker gmail com ) |
| */ |
| |
| #ifndef AVCODEC_AACENC_QUANTIZATION_H |
| #define AVCODEC_AACENC_QUANTIZATION_H |
| |
| #include "aactab.h" |
| #include "aacenc.h" |
| #include "aacenctab.h" |
| #include "aacenc_utils.h" |
| |
| /** |
| * Calculate rate distortion cost for quantizing with given codebook |
| * |
| * @return quantization distortion |
| */ |
| static av_always_inline float quantize_and_encode_band_cost_template( |
| struct AACEncContext *s, |
| PutBitContext *pb, const float *in, float *out, |
| const float *scaled, int size, int scale_idx, |
| int cb, const float lambda, const float uplim, |
| int *bits, float *energy, int BT_ZERO, int BT_UNSIGNED, |
| int BT_PAIR, int BT_ESC, int BT_NOISE, int BT_STEREO, |
| const float ROUNDING) |
| { |
| const int q_idx = POW_SF2_ZERO - scale_idx + SCALE_ONE_POS - SCALE_DIV_512; |
| const float Q = ff_aac_pow2sf_tab [q_idx]; |
| const float Q34 = ff_aac_pow34sf_tab[q_idx]; |
| const float IQ = ff_aac_pow2sf_tab [POW_SF2_ZERO + scale_idx - SCALE_ONE_POS + SCALE_DIV_512]; |
| const float CLIPPED_ESCAPE = 165140.0f*IQ; |
| int i, j; |
| float cost = 0; |
| float qenergy = 0; |
| const int dim = BT_PAIR ? 2 : 4; |
| int resbits = 0; |
| int off; |
| |
| if (BT_ZERO || BT_NOISE || BT_STEREO) { |
| for (i = 0; i < size; i++) |
| cost += in[i]*in[i]; |
| if (bits) |
| *bits = 0; |
| if (energy) |
| *energy = qenergy; |
| if (out) { |
| for (i = 0; i < size; i += dim) |
| for (j = 0; j < dim; j++) |
| out[i+j] = 0.0f; |
| } |
| return cost * lambda; |
| } |
| if (!scaled) { |
| s->abs_pow34(s->scoefs, in, size); |
| scaled = s->scoefs; |
| } |
| s->quant_bands(s->qcoefs, in, scaled, size, !BT_UNSIGNED, aac_cb_maxval[cb], Q34, ROUNDING); |
| if (BT_UNSIGNED) { |
| off = 0; |
| } else { |
| off = aac_cb_maxval[cb]; |
| } |
| for (i = 0; i < size; i += dim) { |
| const float *vec; |
| int *quants = s->qcoefs + i; |
| int curidx = 0; |
| int curbits; |
| float quantized, rd = 0.0f; |
| for (j = 0; j < dim; j++) { |
| curidx *= aac_cb_range[cb]; |
| curidx += quants[j] + off; |
| } |
| curbits = ff_aac_spectral_bits[cb-1][curidx]; |
| vec = &ff_aac_codebook_vectors[cb-1][curidx*dim]; |
| if (BT_UNSIGNED) { |
| for (j = 0; j < dim; j++) { |
| float t = fabsf(in[i+j]); |
| float di; |
| if (BT_ESC && vec[j] == 64.0f) { //FIXME: slow |
| if (t >= CLIPPED_ESCAPE) { |
| quantized = CLIPPED_ESCAPE; |
| curbits += 21; |
| } else { |
| int c = av_clip_uintp2(quant(t, Q, ROUNDING), 13); |
| quantized = c*cbrtf(c)*IQ; |
| curbits += av_log2(c)*2 - 4 + 1; |
| } |
| } else { |
| quantized = vec[j]*IQ; |
| } |
| di = t - quantized; |
| if (out) |
| out[i+j] = in[i+j] >= 0 ? quantized : -quantized; |
| if (vec[j] != 0.0f) |
| curbits++; |
| qenergy += quantized*quantized; |
| rd += di*di; |
| } |
| } else { |
| for (j = 0; j < dim; j++) { |
| quantized = vec[j]*IQ; |
| qenergy += quantized*quantized; |
| if (out) |
| out[i+j] = quantized; |
| rd += (in[i+j] - quantized)*(in[i+j] - quantized); |
| } |
| } |
| cost += rd * lambda + curbits; |
| resbits += curbits; |
| if (cost >= uplim) |
| return uplim; |
| if (pb) { |
| put_bits(pb, ff_aac_spectral_bits[cb-1][curidx], ff_aac_spectral_codes[cb-1][curidx]); |
| if (BT_UNSIGNED) |
| for (j = 0; j < dim; j++) |
| if (ff_aac_codebook_vectors[cb-1][curidx*dim+j] != 0.0f) |
| put_bits(pb, 1, in[i+j] < 0.0f); |
| if (BT_ESC) { |
| for (j = 0; j < 2; j++) { |
| if (ff_aac_codebook_vectors[cb-1][curidx*2+j] == 64.0f) { |
| int coef = av_clip_uintp2(quant(fabsf(in[i+j]), Q, ROUNDING), 13); |
| int len = av_log2(coef); |
| |
| put_bits(pb, len - 4 + 1, (1 << (len - 4 + 1)) - 2); |
| put_sbits(pb, len, coef); |
| } |
| } |
| } |
| } |
| } |
| |
| if (bits) |
| *bits = resbits; |
| if (energy) |
| *energy = qenergy; |
| return cost; |
| } |
| |
| static inline float quantize_and_encode_band_cost_NONE(struct AACEncContext *s, PutBitContext *pb, |
| const float *in, float *quant, const float *scaled, |
| int size, int scale_idx, int cb, |
| const float lambda, const float uplim, |
| int *bits, float *energy) { |
| av_assert0(0); |
| return 0.0f; |
| } |
| |
| #define QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NAME, BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC, BT_NOISE, BT_STEREO, ROUNDING) \ |
| static float quantize_and_encode_band_cost_ ## NAME( \ |
| struct AACEncContext *s, \ |
| PutBitContext *pb, const float *in, float *quant, \ |
| const float *scaled, int size, int scale_idx, \ |
| int cb, const float lambda, const float uplim, \ |
| int *bits, float *energy) { \ |
| return quantize_and_encode_band_cost_template( \ |
| s, pb, in, quant, scaled, size, scale_idx, \ |
| BT_ESC ? ESC_BT : cb, lambda, uplim, bits, energy, \ |
| BT_ZERO, BT_UNSIGNED, BT_PAIR, BT_ESC, BT_NOISE, BT_STEREO, \ |
| ROUNDING); \ |
| } |
| |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ZERO, 1, 0, 0, 0, 0, 0, ROUND_STANDARD) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SQUAD, 0, 0, 0, 0, 0, 0, ROUND_STANDARD) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UQUAD, 0, 1, 0, 0, 0, 0, ROUND_STANDARD) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(SPAIR, 0, 0, 1, 0, 0, 0, ROUND_STANDARD) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(UPAIR, 0, 1, 1, 0, 0, 0, ROUND_STANDARD) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC, 0, 1, 1, 1, 0, 0, ROUND_STANDARD) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(ESC_RTZ, 0, 1, 1, 1, 0, 0, ROUND_TO_ZERO) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(NOISE, 0, 0, 0, 0, 1, 0, ROUND_STANDARD) |
| QUANTIZE_AND_ENCODE_BAND_COST_FUNC(STEREO,0, 0, 0, 0, 0, 1, ROUND_STANDARD) |
| |
| static float (*const quantize_and_encode_band_cost_arr[])( |
| struct AACEncContext *s, |
| PutBitContext *pb, const float *in, float *quant, |
| const float *scaled, int size, int scale_idx, |
| int cb, const float lambda, const float uplim, |
| int *bits, float *energy) = { |
| quantize_and_encode_band_cost_ZERO, |
| quantize_and_encode_band_cost_SQUAD, |
| quantize_and_encode_band_cost_SQUAD, |
| quantize_and_encode_band_cost_UQUAD, |
| quantize_and_encode_band_cost_UQUAD, |
| quantize_and_encode_band_cost_SPAIR, |
| quantize_and_encode_band_cost_SPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_ESC, |
| quantize_and_encode_band_cost_NONE, /* CB 12 doesn't exist */ |
| quantize_and_encode_band_cost_NOISE, |
| quantize_and_encode_band_cost_STEREO, |
| quantize_and_encode_band_cost_STEREO, |
| }; |
| |
| static float (*const quantize_and_encode_band_cost_rtz_arr[])( |
| struct AACEncContext *s, |
| PutBitContext *pb, const float *in, float *quant, |
| const float *scaled, int size, int scale_idx, |
| int cb, const float lambda, const float uplim, |
| int *bits, float *energy) = { |
| quantize_and_encode_band_cost_ZERO, |
| quantize_and_encode_band_cost_SQUAD, |
| quantize_and_encode_band_cost_SQUAD, |
| quantize_and_encode_band_cost_UQUAD, |
| quantize_and_encode_band_cost_UQUAD, |
| quantize_and_encode_band_cost_SPAIR, |
| quantize_and_encode_band_cost_SPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_UPAIR, |
| quantize_and_encode_band_cost_ESC_RTZ, |
| quantize_and_encode_band_cost_NONE, /* CB 12 doesn't exist */ |
| quantize_and_encode_band_cost_NOISE, |
| quantize_and_encode_band_cost_STEREO, |
| quantize_and_encode_band_cost_STEREO, |
| }; |
| |
| #define quantize_and_encode_band_cost( \ |
| s, pb, in, quant, scaled, size, scale_idx, cb, \ |
| lambda, uplim, bits, energy, rtz) \ |
| ((rtz) ? quantize_and_encode_band_cost_rtz_arr : quantize_and_encode_band_cost_arr)[cb]( \ |
| s, pb, in, quant, scaled, size, scale_idx, cb, \ |
| lambda, uplim, bits, energy) |
| |
| static inline float quantize_band_cost(struct AACEncContext *s, const float *in, |
| const float *scaled, int size, int scale_idx, |
| int cb, const float lambda, const float uplim, |
| int *bits, float *energy, int rtz) |
| { |
| return quantize_and_encode_band_cost(s, NULL, in, NULL, scaled, size, scale_idx, |
| cb, lambda, uplim, bits, energy, rtz); |
| } |
| |
| static inline int quantize_band_cost_bits(struct AACEncContext *s, const float *in, |
| const float *scaled, int size, int scale_idx, |
| int cb, const float lambda, const float uplim, |
| int *bits, float *energy, int rtz) |
| { |
| int auxbits; |
| quantize_and_encode_band_cost(s, NULL, in, NULL, scaled, size, scale_idx, |
| cb, 0.0f, uplim, &auxbits, energy, rtz); |
| if (bits) { |
| *bits = auxbits; |
| } |
| return auxbits; |
| } |
| |
| static inline void quantize_and_encode_band(struct AACEncContext *s, PutBitContext *pb, |
| const float *in, float *out, int size, int scale_idx, |
| int cb, const float lambda, int rtz) |
| { |
| quantize_and_encode_band_cost(s, pb, in, out, NULL, size, scale_idx, cb, lambda, |
| INFINITY, NULL, NULL, rtz); |
| } |
| |
| #include "aacenc_quantization_misc.h" |
| |
| #endif /* AVCODEC_AACENC_QUANTIZATION_H */ |
