0f4334df45
This commit adds the ability for a profile to set the default options, as well as for the user to override such options by simply stating them in the command line while still keeping the same profile, as long as those options are still permitted by the profile. Example: setting the profile to aac_low (the default) will turn PNS and IS on. They can be disabled by -aac_pns 0 and -aac_is 0, respectively. Turning on -aac_pred 1 will cause the profile to be elevated to aac_main, as long as no options forbidding aac_main have been entered (like AAC-LTP, which will be pushed soon). A useful feature is that by setting the profile to mpeg2_aac_low, all MPEG4 features will be disabled and if the user tries to enable them then the program will exit with an error. This profile is signalled with the same bitstream as aac_low (MPEG4) but some devices and decoders will fail if any MPEG4 features have been enabled.
244 lines
8.8 KiB
C
244 lines
8.8 KiB
C
/*
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* AAC encoder utilities
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* Copyright (C) 2015 Rostislav Pehlivanov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* AAC encoder utilities
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* @author Rostislav Pehlivanov ( atomnuker gmail com )
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*/
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#ifndef AVCODEC_AACENC_UTILS_H
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#define AVCODEC_AACENC_UTILS_H
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#include "aac.h"
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#include "aac_tablegen_decl.h"
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#include "aacenctab.h"
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#define ROUND_STANDARD 0.4054f
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#define ROUND_TO_ZERO 0.1054f
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#define C_QUANT 0.4054f
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static inline void abs_pow34_v(float *out, const float *in, const int size)
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{
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int i;
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for (i = 0; i < size; i++) {
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float a = fabsf(in[i]);
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out[i] = sqrtf(a * sqrtf(a));
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}
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}
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/**
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* Quantize one coefficient.
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* @return absolute value of the quantized coefficient
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* @see 3GPP TS26.403 5.6.2 "Scalefactor determination"
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*/
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static inline int quant(float coef, const float Q, const float rounding)
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{
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float a = coef * Q;
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return sqrtf(a * sqrtf(a)) + rounding;
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}
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static inline void quantize_bands(int *out, const float *in, const float *scaled,
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int size, float Q34, int is_signed, int maxval,
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const float rounding)
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{
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int i;
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double qc;
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for (i = 0; i < size; i++) {
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qc = scaled[i] * Q34;
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out[i] = (int)FFMIN(qc + rounding, (double)maxval);
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if (is_signed && in[i] < 0.0f) {
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out[i] = -out[i];
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}
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}
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}
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static inline float find_max_val(int group_len, int swb_size, const float *scaled)
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{
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float maxval = 0.0f;
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int w2, i;
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for (w2 = 0; w2 < group_len; w2++) {
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for (i = 0; i < swb_size; i++) {
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maxval = FFMAX(maxval, scaled[w2*128+i]);
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}
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}
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return maxval;
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}
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static inline int find_min_book(float maxval, int sf)
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{
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float Q = ff_aac_pow2sf_tab[POW_SF2_ZERO - sf + SCALE_ONE_POS - SCALE_DIV_512];
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float Q34 = sqrtf(Q * sqrtf(Q));
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int qmaxval, cb;
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qmaxval = maxval * Q34 + C_QUANT;
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if (qmaxval >= (FF_ARRAY_ELEMS(aac_maxval_cb)))
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cb = 11;
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else
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cb = aac_maxval_cb[qmaxval];
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return cb;
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}
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static inline float find_form_factor(int group_len, int swb_size, float thresh, const float *scaled, float nzslope) {
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const float iswb_size = 1.0f / swb_size;
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const float iswb_sizem1 = 1.0f / (swb_size - 1);
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const float ethresh = thresh;
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float form = 0.0f, weight = 0.0f;
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int w2, i;
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for (w2 = 0; w2 < group_len; w2++) {
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float e = 0.0f, e2 = 0.0f, var = 0.0f, maxval = 0.0f;
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float nzl = 0;
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for (i = 0; i < swb_size; i++) {
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float s = fabsf(scaled[w2*128+i]);
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maxval = FFMAX(maxval, s);
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e += s;
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e2 += s *= s;
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/* We really don't want a hard non-zero-line count, since
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* even below-threshold lines do add up towards band spectral power.
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* So, fall steeply towards zero, but smoothly
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*/
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if (s >= ethresh) {
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nzl += 1.0f;
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} else {
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nzl += powf(s / ethresh, nzslope);
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}
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}
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if (e2 > thresh) {
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float frm;
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e *= iswb_size;
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/** compute variance */
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for (i = 0; i < swb_size; i++) {
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float d = fabsf(scaled[w2*128+i]) - e;
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var += d*d;
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}
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var = sqrtf(var * iswb_sizem1);
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e2 *= iswb_size;
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frm = e / FFMIN(e+4*var,maxval);
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form += e2 * sqrtf(frm) / FFMAX(0.5f,nzl);
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weight += e2;
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}
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}
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if (weight > 0) {
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return form / weight;
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} else {
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return 1.0f;
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}
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}
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/** Return the minimum scalefactor where the quantized coef does not clip. */
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static inline uint8_t coef2minsf(float coef)
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{
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return av_clip_uint8(log2f(coef)*4 - 69 + SCALE_ONE_POS - SCALE_DIV_512);
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}
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/** Return the maximum scalefactor where the quantized coef is not zero. */
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static inline uint8_t coef2maxsf(float coef)
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{
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return av_clip_uint8(log2f(coef)*4 + 6 + SCALE_ONE_POS - SCALE_DIV_512);
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}
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/*
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* Returns the closest possible index to an array of float values, given a value.
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*/
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static inline int quant_array_idx(const float val, const float *arr, const int num)
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{
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int i, index = 0;
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float quant_min_err = INFINITY;
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for (i = 0; i < num; i++) {
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float error = (val - arr[i])*(val - arr[i]);
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if (error < quant_min_err) {
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quant_min_err = error;
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index = i;
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}
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}
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return index;
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}
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/**
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* approximates exp10f(-3.0f*(0.5f + 0.5f * cosf(FFMIN(b,15.5f) / 15.5f)))
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*/
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static av_always_inline float bval2bmax(float b)
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{
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return 0.001f + 0.0035f * (b*b*b) / (15.5f*15.5f*15.5f);
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}
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/*
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* linear congruential pseudorandom number generator, copied from the decoder
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*/
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static inline int lcg_random(unsigned previous_val)
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{
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union { unsigned u; int s; } v = { previous_val * 1664525u + 1013904223 };
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return v.s;
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}
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#define ERROR_IF(cond, ...) \
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if (cond) { \
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av_log(avctx, AV_LOG_ERROR, __VA_ARGS__); \
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return AVERROR(EINVAL); \
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}
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#define WARN_IF(cond, ...) \
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if (cond) { \
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av_log(avctx, AV_LOG_WARNING, __VA_ARGS__); \
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}
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#define AAC_OPT_SET(e_opt, p_opt, bypass, name) \
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ERROR_IF ((e_opt)->name == 1 && (p_opt)->name == OPT_BANNED, \
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"Profile %i does not allow %s\n", avctx->profile, #name); \
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ERROR_IF ((e_opt)->name == 0 && (p_opt)->name == OPT_REQUIRED, \
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"Option %s is a requirement for this profile (%i)\n", \
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#name, avctx->profile); \
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if ((e_opt)->name == 1 && (p_opt)->name == OPT_NEEDS_MAIN && \
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avctx->profile == FF_PROFILE_AAC_LOW) { \
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WARN_IF(1, "Profile %i does not allow for %s, setting profile to " \
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"\"aac_main\"(%i)\n", avctx->profile, #name, \
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FF_PROFILE_AAC_MAIN); \
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avctx->profile = FF_PROFILE_AAC_MAIN; \
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p_opt = &aacenc_profiles[FF_PROFILE_AAC_MAIN].opts; \
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} \
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if ((e_opt)->name == 1 && (p_opt)->name == OPT_NEEDS_LTP && \
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avctx->profile == FF_PROFILE_AAC_LOW) { \
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WARN_IF(1, "Profile %i does not allow for %s, setting profile to " \
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"\"aac_ltp\"(%i)\n", avctx->profile, #name, \
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FF_PROFILE_AAC_LTP); \
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avctx->profile = FF_PROFILE_AAC_LTP; \
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p_opt = &aacenc_profiles[FF_PROFILE_AAC_LTP].opts; \
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} \
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if ((e_opt)->name == OPT_AUTO) { \
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if ((p_opt)->name == OPT_BANNED) { \
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(e_opt)->name = 0; \
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} else if ((p_opt)->name == OPT_NEEDS_LTP) { \
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(e_opt)->name = 0; \
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} else if ((p_opt)->name == OPT_NEEDS_MAIN) { \
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(e_opt)->name = 0; \
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} else if ((p_opt)->name == OPT_REQUIRED) { \
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(e_opt)->name = 1; \
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} else if (bypass) { \
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(e_opt)->name = (e_opt)->name; \
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} else { \
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(e_opt)->name = (p_opt)->name; \
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} \
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} \
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av_log(avctx, AV_LOG_VERBOSE, "Option %s set to %i\n", #name, (e_opt)->name);
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#endif /* AVCODEC_AACENC_UTILS_H */
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