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https://github.com/FFmpeg/FFmpeg.git
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1ea3650823
They do the same. Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
725 lines
28 KiB
C
725 lines
28 KiB
C
/*
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* Copyright (c) 2011 Jan Kokemüller
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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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* This file is based on libebur128 which is available at
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* https://github.com/jiixyj/libebur128/
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*
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* Libebur128 has the following copyright:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "ebur128.h"
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#include <float.h>
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#include <limits.h>
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#include <math.h> /* You may have to define _USE_MATH_DEFINES if you use MSVC */
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#include "libavutil/common.h"
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#include "libavutil/mem.h"
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#include "libavutil/mem_internal.h"
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#include "libavutil/thread.h"
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#define CHECK_ERROR(condition, errorcode, goto_point) \
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if ((condition)) { \
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errcode = (errorcode); \
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goto goto_point; \
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}
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#define ALMOST_ZERO 0.000001
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#define RELATIVE_GATE (-10.0)
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#define RELATIVE_GATE_FACTOR pow(10.0, RELATIVE_GATE / 10.0)
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#define MINUS_20DB pow(10.0, -20.0 / 10.0)
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struct FFEBUR128StateInternal {
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/** Filtered audio data (used as ring buffer). */
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double *audio_data;
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/** Size of audio_data array. */
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size_t audio_data_frames;
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/** Current index for audio_data. */
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size_t audio_data_index;
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/** How many frames are needed for a gating block. Will correspond to 400ms
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* of audio at initialization, and 100ms after the first block (75% overlap
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* as specified in the 2011 revision of BS1770). */
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unsigned long needed_frames;
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/** The channel map. Has as many elements as there are channels. */
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int *channel_map;
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/** How many samples fit in 100ms (rounded). */
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unsigned long samples_in_100ms;
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/** BS.1770 filter coefficients (nominator). */
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double b[5];
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/** BS.1770 filter coefficients (denominator). */
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double a[5];
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/** BS.1770 filter state. */
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double v[5][5];
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/** Histograms, used to calculate LRA. */
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unsigned long *block_energy_histogram;
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unsigned long *short_term_block_energy_histogram;
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/** Keeps track of when a new short term block is needed. */
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size_t short_term_frame_counter;
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/** Maximum sample peak, one per channel */
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double *sample_peak;
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/** The maximum window duration in ms. */
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unsigned long window;
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/** Data pointer array for interleaved data */
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void **data_ptrs;
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};
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static AVOnce histogram_init = AV_ONCE_INIT;
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static DECLARE_ALIGNED(32, double, histogram_energies)[1000];
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static DECLARE_ALIGNED(32, double, histogram_energy_boundaries)[1001];
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static void ebur128_init_filter(FFEBUR128State * st)
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{
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int i, j;
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double f0 = 1681.974450955533;
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double G = 3.999843853973347;
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double Q = 0.7071752369554196;
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double K = tan(M_PI * f0 / (double) st->samplerate);
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double Vh = pow(10.0, G / 20.0);
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double Vb = pow(Vh, 0.4996667741545416);
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double pb[3] = { 0.0, 0.0, 0.0 };
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double pa[3] = { 1.0, 0.0, 0.0 };
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double rb[3] = { 1.0, -2.0, 1.0 };
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double ra[3] = { 1.0, 0.0, 0.0 };
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double a0 = 1.0 + K / Q + K * K;
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pb[0] = (Vh + Vb * K / Q + K * K) / a0;
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pb[1] = 2.0 * (K * K - Vh) / a0;
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pb[2] = (Vh - Vb * K / Q + K * K) / a0;
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pa[1] = 2.0 * (K * K - 1.0) / a0;
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pa[2] = (1.0 - K / Q + K * K) / a0;
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f0 = 38.13547087602444;
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Q = 0.5003270373238773;
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K = tan(M_PI * f0 / (double) st->samplerate);
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ra[1] = 2.0 * (K * K - 1.0) / (1.0 + K / Q + K * K);
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ra[2] = (1.0 - K / Q + K * K) / (1.0 + K / Q + K * K);
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st->d->b[0] = pb[0] * rb[0];
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st->d->b[1] = pb[0] * rb[1] + pb[1] * rb[0];
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st->d->b[2] = pb[0] * rb[2] + pb[1] * rb[1] + pb[2] * rb[0];
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st->d->b[3] = pb[1] * rb[2] + pb[2] * rb[1];
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st->d->b[4] = pb[2] * rb[2];
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st->d->a[0] = pa[0] * ra[0];
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st->d->a[1] = pa[0] * ra[1] + pa[1] * ra[0];
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st->d->a[2] = pa[0] * ra[2] + pa[1] * ra[1] + pa[2] * ra[0];
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st->d->a[3] = pa[1] * ra[2] + pa[2] * ra[1];
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st->d->a[4] = pa[2] * ra[2];
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for (i = 0; i < 5; ++i) {
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for (j = 0; j < 5; ++j) {
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st->d->v[i][j] = 0.0;
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}
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}
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}
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static int ebur128_init_channel_map(FFEBUR128State * st)
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{
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size_t i;
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st->d->channel_map =
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(int *) av_malloc_array(st->channels, sizeof(*st->d->channel_map));
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if (!st->d->channel_map)
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return AVERROR(ENOMEM);
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if (st->channels == 4) {
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st->d->channel_map[0] = FF_EBUR128_LEFT;
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st->d->channel_map[1] = FF_EBUR128_RIGHT;
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st->d->channel_map[2] = FF_EBUR128_LEFT_SURROUND;
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st->d->channel_map[3] = FF_EBUR128_RIGHT_SURROUND;
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} else if (st->channels == 5) {
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st->d->channel_map[0] = FF_EBUR128_LEFT;
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st->d->channel_map[1] = FF_EBUR128_RIGHT;
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st->d->channel_map[2] = FF_EBUR128_CENTER;
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st->d->channel_map[3] = FF_EBUR128_LEFT_SURROUND;
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st->d->channel_map[4] = FF_EBUR128_RIGHT_SURROUND;
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} else {
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for (i = 0; i < st->channels; ++i) {
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switch (i) {
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case 0:
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st->d->channel_map[i] = FF_EBUR128_LEFT;
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break;
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case 1:
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st->d->channel_map[i] = FF_EBUR128_RIGHT;
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break;
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case 2:
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st->d->channel_map[i] = FF_EBUR128_CENTER;
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break;
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case 3:
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st->d->channel_map[i] = FF_EBUR128_UNUSED;
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break;
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case 4:
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st->d->channel_map[i] = FF_EBUR128_LEFT_SURROUND;
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break;
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case 5:
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st->d->channel_map[i] = FF_EBUR128_RIGHT_SURROUND;
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break;
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default:
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st->d->channel_map[i] = FF_EBUR128_UNUSED;
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break;
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}
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}
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}
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return 0;
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}
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static inline void init_histogram(void)
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{
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int i;
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/* initialize static constants */
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histogram_energy_boundaries[0] = pow(10.0, (-70.0 + 0.691) / 10.0);
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for (i = 0; i < 1000; ++i) {
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histogram_energies[i] =
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pow(10.0, ((double) i / 10.0 - 69.95 + 0.691) / 10.0);
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}
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for (i = 1; i < 1001; ++i) {
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histogram_energy_boundaries[i] =
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pow(10.0, ((double) i / 10.0 - 70.0 + 0.691) / 10.0);
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}
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}
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FFEBUR128State *ff_ebur128_init(unsigned int channels,
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unsigned long samplerate,
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unsigned long window, int mode)
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{
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int errcode;
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FFEBUR128State *st;
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st = (FFEBUR128State *) av_malloc(sizeof(*st));
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CHECK_ERROR(!st, 0, exit)
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st->d = (struct FFEBUR128StateInternal *)
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av_malloc(sizeof(*st->d));
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CHECK_ERROR(!st->d, 0, free_state)
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st->channels = channels;
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errcode = ebur128_init_channel_map(st);
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CHECK_ERROR(errcode, 0, free_internal)
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st->d->sample_peak =
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(double *) av_calloc(channels, sizeof(*st->d->sample_peak));
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CHECK_ERROR(!st->d->sample_peak, 0, free_channel_map)
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st->samplerate = samplerate;
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st->d->samples_in_100ms = (st->samplerate + 5) / 10;
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st->mode = mode;
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if ((mode & FF_EBUR128_MODE_S) == FF_EBUR128_MODE_S) {
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st->d->window = FFMAX(window, 3000);
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} else if ((mode & FF_EBUR128_MODE_M) == FF_EBUR128_MODE_M) {
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st->d->window = FFMAX(window, 400);
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} else {
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goto free_sample_peak;
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}
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st->d->audio_data_frames = st->samplerate * st->d->window / 1000;
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if (st->d->audio_data_frames % st->d->samples_in_100ms) {
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/* round up to multiple of samples_in_100ms */
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st->d->audio_data_frames = st->d->audio_data_frames
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+ st->d->samples_in_100ms
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- (st->d->audio_data_frames % st->d->samples_in_100ms);
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}
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st->d->audio_data =
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(double *) av_calloc(st->d->audio_data_frames,
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st->channels * sizeof(*st->d->audio_data));
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CHECK_ERROR(!st->d->audio_data, 0, free_sample_peak)
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ebur128_init_filter(st);
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st->d->block_energy_histogram =
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av_mallocz(1000 * sizeof(*st->d->block_energy_histogram));
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CHECK_ERROR(!st->d->block_energy_histogram, 0, free_audio_data)
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st->d->short_term_block_energy_histogram =
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av_mallocz(1000 * sizeof(*st->d->short_term_block_energy_histogram));
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CHECK_ERROR(!st->d->short_term_block_energy_histogram, 0,
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free_block_energy_histogram)
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st->d->short_term_frame_counter = 0;
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/* the first block needs 400ms of audio data */
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st->d->needed_frames = st->d->samples_in_100ms * 4;
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/* start at the beginning of the buffer */
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st->d->audio_data_index = 0;
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if (ff_thread_once(&histogram_init, &init_histogram) != 0)
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goto free_short_term_block_energy_histogram;
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st->d->data_ptrs = av_malloc_array(channels, sizeof(*st->d->data_ptrs));
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CHECK_ERROR(!st->d->data_ptrs, 0,
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free_short_term_block_energy_histogram);
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return st;
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free_short_term_block_energy_histogram:
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av_free(st->d->short_term_block_energy_histogram);
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free_block_energy_histogram:
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av_free(st->d->block_energy_histogram);
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free_audio_data:
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av_free(st->d->audio_data);
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free_sample_peak:
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av_free(st->d->sample_peak);
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free_channel_map:
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av_free(st->d->channel_map);
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free_internal:
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av_free(st->d);
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free_state:
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av_free(st);
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exit:
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return NULL;
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}
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void ff_ebur128_destroy(FFEBUR128State ** st)
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{
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av_free((*st)->d->block_energy_histogram);
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av_free((*st)->d->short_term_block_energy_histogram);
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av_free((*st)->d->audio_data);
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av_free((*st)->d->channel_map);
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av_free((*st)->d->sample_peak);
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av_free((*st)->d->data_ptrs);
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av_free((*st)->d);
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av_free(*st);
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*st = NULL;
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}
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#define EBUR128_FILTER(type, scaling_factor) \
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static void ebur128_filter_##type(FFEBUR128State* st, const type** srcs, \
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size_t src_index, size_t frames, \
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int stride) { \
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double* audio_data = st->d->audio_data + st->d->audio_data_index; \
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size_t i, c; \
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\
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if ((st->mode & FF_EBUR128_MODE_SAMPLE_PEAK) == FF_EBUR128_MODE_SAMPLE_PEAK) { \
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for (c = 0; c < st->channels; ++c) { \
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double max = 0.0; \
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for (i = 0; i < frames; ++i) { \
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type v = srcs[c][src_index + i * stride]; \
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if (v > max) { \
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max = v; \
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} else if (-v > max) { \
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max = -1.0 * v; \
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} \
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} \
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max /= scaling_factor; \
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if (max > st->d->sample_peak[c]) st->d->sample_peak[c] = max; \
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} \
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} \
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for (c = 0; c < st->channels; ++c) { \
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int ci = st->d->channel_map[c] - 1; \
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if (ci < 0) continue; \
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else if (ci == FF_EBUR128_DUAL_MONO - 1) ci = 0; /*dual mono */ \
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for (i = 0; i < frames; ++i) { \
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st->d->v[ci][0] = (double) (srcs[c][src_index + i * stride] / scaling_factor) \
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- st->d->a[1] * st->d->v[ci][1] \
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- st->d->a[2] * st->d->v[ci][2] \
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- st->d->a[3] * st->d->v[ci][3] \
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- st->d->a[4] * st->d->v[ci][4]; \
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audio_data[i * st->channels + c] = \
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st->d->b[0] * st->d->v[ci][0] \
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+ st->d->b[1] * st->d->v[ci][1] \
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+ st->d->b[2] * st->d->v[ci][2] \
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+ st->d->b[3] * st->d->v[ci][3] \
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+ st->d->b[4] * st->d->v[ci][4]; \
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st->d->v[ci][4] = st->d->v[ci][3]; \
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st->d->v[ci][3] = st->d->v[ci][2]; \
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st->d->v[ci][2] = st->d->v[ci][1]; \
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st->d->v[ci][1] = st->d->v[ci][0]; \
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} \
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st->d->v[ci][4] = fabs(st->d->v[ci][4]) < DBL_MIN ? 0.0 : st->d->v[ci][4]; \
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st->d->v[ci][3] = fabs(st->d->v[ci][3]) < DBL_MIN ? 0.0 : st->d->v[ci][3]; \
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st->d->v[ci][2] = fabs(st->d->v[ci][2]) < DBL_MIN ? 0.0 : st->d->v[ci][2]; \
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st->d->v[ci][1] = fabs(st->d->v[ci][1]) < DBL_MIN ? 0.0 : st->d->v[ci][1]; \
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} \
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}
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EBUR128_FILTER(double, 1.0)
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static double ebur128_energy_to_loudness(double energy)
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{
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return 10 * log10(energy) - 0.691;
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}
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static size_t find_histogram_index(double energy)
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{
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size_t index_min = 0;
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size_t index_max = 1000;
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size_t index_mid;
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do {
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index_mid = (index_min + index_max) / 2;
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if (energy >= histogram_energy_boundaries[index_mid]) {
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index_min = index_mid;
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} else {
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index_max = index_mid;
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}
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} while (index_max - index_min != 1);
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return index_min;
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}
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static void ebur128_calc_gating_block(FFEBUR128State * st,
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size_t frames_per_block,
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double *optional_output)
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{
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size_t i, c;
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double sum = 0.0;
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double channel_sum;
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for (c = 0; c < st->channels; ++c) {
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if (st->d->channel_map[c] == FF_EBUR128_UNUSED)
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continue;
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channel_sum = 0.0;
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if (st->d->audio_data_index < frames_per_block * st->channels) {
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for (i = 0; i < st->d->audio_data_index / st->channels; ++i) {
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channel_sum += st->d->audio_data[i * st->channels + c] *
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st->d->audio_data[i * st->channels + c];
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}
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for (i = st->d->audio_data_frames -
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(frames_per_block -
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st->d->audio_data_index / st->channels);
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i < st->d->audio_data_frames; ++i) {
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channel_sum += st->d->audio_data[i * st->channels + c] *
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st->d->audio_data[i * st->channels + c];
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}
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} else {
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for (i =
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st->d->audio_data_index / st->channels - frames_per_block;
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i < st->d->audio_data_index / st->channels; ++i) {
|
|
channel_sum +=
|
|
st->d->audio_data[i * st->channels +
|
|
c] * st->d->audio_data[i *
|
|
st->channels +
|
|
c];
|
|
}
|
|
}
|
|
if (st->d->channel_map[c] == FF_EBUR128_Mp110 ||
|
|
st->d->channel_map[c] == FF_EBUR128_Mm110 ||
|
|
st->d->channel_map[c] == FF_EBUR128_Mp060 ||
|
|
st->d->channel_map[c] == FF_EBUR128_Mm060 ||
|
|
st->d->channel_map[c] == FF_EBUR128_Mp090 ||
|
|
st->d->channel_map[c] == FF_EBUR128_Mm090) {
|
|
channel_sum *= 1.41;
|
|
} else if (st->d->channel_map[c] == FF_EBUR128_DUAL_MONO) {
|
|
channel_sum *= 2.0;
|
|
}
|
|
sum += channel_sum;
|
|
}
|
|
sum /= (double) frames_per_block;
|
|
if (optional_output) {
|
|
*optional_output = sum;
|
|
} else if (sum >= histogram_energy_boundaries[0]) {
|
|
++st->d->block_energy_histogram[find_histogram_index(sum)];
|
|
}
|
|
}
|
|
|
|
int ff_ebur128_set_channel(FFEBUR128State * st,
|
|
unsigned int channel_number, int value)
|
|
{
|
|
if (channel_number >= st->channels) {
|
|
return 1;
|
|
}
|
|
if (value == FF_EBUR128_DUAL_MONO &&
|
|
(st->channels != 1 || channel_number != 0)) {
|
|
return 1;
|
|
}
|
|
st->d->channel_map[channel_number] = value;
|
|
return 0;
|
|
}
|
|
|
|
static int ebur128_energy_shortterm(FFEBUR128State * st, double *out);
|
|
#define EBUR128_ADD_FRAMES_PLANAR(type) \
|
|
static void ebur128_add_frames_planar_##type(FFEBUR128State* st, const type** srcs, \
|
|
size_t frames, int stride) { \
|
|
size_t src_index = 0; \
|
|
while (frames > 0) { \
|
|
if (frames >= st->d->needed_frames) { \
|
|
ebur128_filter_##type(st, srcs, src_index, st->d->needed_frames, stride); \
|
|
src_index += st->d->needed_frames * stride; \
|
|
frames -= st->d->needed_frames; \
|
|
st->d->audio_data_index += st->d->needed_frames * st->channels; \
|
|
/* calculate the new gating block */ \
|
|
if ((st->mode & FF_EBUR128_MODE_I) == FF_EBUR128_MODE_I) { \
|
|
ebur128_calc_gating_block(st, st->d->samples_in_100ms * 4, NULL); \
|
|
} \
|
|
if ((st->mode & FF_EBUR128_MODE_LRA) == FF_EBUR128_MODE_LRA) { \
|
|
st->d->short_term_frame_counter += st->d->needed_frames; \
|
|
if (st->d->short_term_frame_counter == st->d->samples_in_100ms * 30) { \
|
|
double st_energy; \
|
|
ebur128_energy_shortterm(st, &st_energy); \
|
|
if (st_energy >= histogram_energy_boundaries[0]) { \
|
|
++st->d->short_term_block_energy_histogram[ \
|
|
find_histogram_index(st_energy)]; \
|
|
} \
|
|
st->d->short_term_frame_counter = st->d->samples_in_100ms * 20; \
|
|
} \
|
|
} \
|
|
/* 100ms are needed for all blocks besides the first one */ \
|
|
st->d->needed_frames = st->d->samples_in_100ms; \
|
|
/* reset audio_data_index when buffer full */ \
|
|
if (st->d->audio_data_index == st->d->audio_data_frames * st->channels) { \
|
|
st->d->audio_data_index = 0; \
|
|
} \
|
|
} else { \
|
|
ebur128_filter_##type(st, srcs, src_index, frames, stride); \
|
|
st->d->audio_data_index += frames * st->channels; \
|
|
if ((st->mode & FF_EBUR128_MODE_LRA) == FF_EBUR128_MODE_LRA) { \
|
|
st->d->short_term_frame_counter += frames; \
|
|
} \
|
|
st->d->needed_frames -= frames; \
|
|
frames = 0; \
|
|
} \
|
|
} \
|
|
}
|
|
EBUR128_ADD_FRAMES_PLANAR(double)
|
|
#define FF_EBUR128_ADD_FRAMES(type) \
|
|
void ff_ebur128_add_frames_##type(FFEBUR128State* st, const type* src, \
|
|
size_t frames) { \
|
|
int i; \
|
|
const type **buf = (const type**)st->d->data_ptrs; \
|
|
for (i = 0; i < st->channels; i++) \
|
|
buf[i] = src + i; \
|
|
ebur128_add_frames_planar_##type(st, buf, frames, st->channels); \
|
|
}
|
|
FF_EBUR128_ADD_FRAMES(double)
|
|
|
|
static int ebur128_calc_relative_threshold(FFEBUR128State **sts, size_t size,
|
|
double *relative_threshold)
|
|
{
|
|
size_t i, j;
|
|
int above_thresh_counter = 0;
|
|
*relative_threshold = 0.0;
|
|
|
|
for (i = 0; i < size; i++) {
|
|
unsigned long *block_energy_histogram = sts[i]->d->block_energy_histogram;
|
|
for (j = 0; j < 1000; ++j) {
|
|
*relative_threshold += block_energy_histogram[j] * histogram_energies[j];
|
|
above_thresh_counter += block_energy_histogram[j];
|
|
}
|
|
}
|
|
|
|
if (above_thresh_counter != 0) {
|
|
*relative_threshold /= (double)above_thresh_counter;
|
|
*relative_threshold *= RELATIVE_GATE_FACTOR;
|
|
}
|
|
|
|
return above_thresh_counter;
|
|
}
|
|
|
|
static int ebur128_gated_loudness(FFEBUR128State ** sts, size_t size,
|
|
double *out)
|
|
{
|
|
double gated_loudness = 0.0;
|
|
double relative_threshold;
|
|
size_t above_thresh_counter;
|
|
size_t i, j, start_index;
|
|
|
|
for (i = 0; i < size; i++)
|
|
if ((sts[i]->mode & FF_EBUR128_MODE_I) != FF_EBUR128_MODE_I)
|
|
return AVERROR(EINVAL);
|
|
|
|
if (!ebur128_calc_relative_threshold(sts, size, &relative_threshold)) {
|
|
*out = -HUGE_VAL;
|
|
return 0;
|
|
}
|
|
|
|
above_thresh_counter = 0;
|
|
if (relative_threshold < histogram_energy_boundaries[0]) {
|
|
start_index = 0;
|
|
} else {
|
|
start_index = find_histogram_index(relative_threshold);
|
|
if (relative_threshold > histogram_energies[start_index]) {
|
|
++start_index;
|
|
}
|
|
}
|
|
for (i = 0; i < size; i++) {
|
|
for (j = start_index; j < 1000; ++j) {
|
|
gated_loudness += sts[i]->d->block_energy_histogram[j] *
|
|
histogram_energies[j];
|
|
above_thresh_counter += sts[i]->d->block_energy_histogram[j];
|
|
}
|
|
}
|
|
if (!above_thresh_counter) {
|
|
*out = -HUGE_VAL;
|
|
return 0;
|
|
}
|
|
gated_loudness /= (double) above_thresh_counter;
|
|
*out = ebur128_energy_to_loudness(gated_loudness);
|
|
return 0;
|
|
}
|
|
|
|
int ff_ebur128_relative_threshold(FFEBUR128State * st, double *out)
|
|
{
|
|
double relative_threshold;
|
|
|
|
if ((st->mode & FF_EBUR128_MODE_I) != FF_EBUR128_MODE_I)
|
|
return AVERROR(EINVAL);
|
|
|
|
if (!ebur128_calc_relative_threshold(&st, 1, &relative_threshold)) {
|
|
*out = -70.0;
|
|
return 0;
|
|
}
|
|
|
|
*out = ebur128_energy_to_loudness(relative_threshold);
|
|
return 0;
|
|
}
|
|
|
|
int ff_ebur128_loudness_global(FFEBUR128State * st, double *out)
|
|
{
|
|
return ebur128_gated_loudness(&st, 1, out);
|
|
}
|
|
|
|
static int ebur128_energy_in_interval(FFEBUR128State * st,
|
|
size_t interval_frames, double *out)
|
|
{
|
|
if (interval_frames > st->d->audio_data_frames) {
|
|
return AVERROR(EINVAL);
|
|
}
|
|
ebur128_calc_gating_block(st, interval_frames, out);
|
|
return 0;
|
|
}
|
|
|
|
static int ebur128_energy_shortterm(FFEBUR128State * st, double *out)
|
|
{
|
|
return ebur128_energy_in_interval(st, st->d->samples_in_100ms * 30,
|
|
out);
|
|
}
|
|
|
|
int ff_ebur128_loudness_shortterm(FFEBUR128State * st, double *out)
|
|
{
|
|
double energy;
|
|
int error = ebur128_energy_shortterm(st, &energy);
|
|
if (error) {
|
|
return error;
|
|
} else if (energy <= 0.0) {
|
|
*out = -HUGE_VAL;
|
|
return 0;
|
|
}
|
|
*out = ebur128_energy_to_loudness(energy);
|
|
return 0;
|
|
}
|
|
|
|
/* EBU - TECH 3342 */
|
|
int ff_ebur128_loudness_range_multiple(FFEBUR128State ** sts, size_t size,
|
|
double *out)
|
|
{
|
|
size_t i, j;
|
|
size_t stl_size;
|
|
double stl_power, stl_integrated;
|
|
/* High and low percentile energy */
|
|
double h_en, l_en;
|
|
unsigned long hist[1000] = { 0 };
|
|
size_t percentile_low, percentile_high;
|
|
size_t index;
|
|
|
|
for (i = 0; i < size; ++i) {
|
|
if (sts[i]) {
|
|
if ((sts[i]->mode & FF_EBUR128_MODE_LRA) !=
|
|
FF_EBUR128_MODE_LRA) {
|
|
return AVERROR(EINVAL);
|
|
}
|
|
}
|
|
}
|
|
|
|
stl_size = 0;
|
|
stl_power = 0.0;
|
|
for (i = 0; i < size; ++i) {
|
|
if (!sts[i])
|
|
continue;
|
|
for (j = 0; j < 1000; ++j) {
|
|
hist[j] += sts[i]->d->short_term_block_energy_histogram[j];
|
|
stl_size += sts[i]->d->short_term_block_energy_histogram[j];
|
|
stl_power += sts[i]->d->short_term_block_energy_histogram[j]
|
|
* histogram_energies[j];
|
|
}
|
|
}
|
|
if (!stl_size) {
|
|
*out = 0.0;
|
|
return 0;
|
|
}
|
|
|
|
stl_power /= stl_size;
|
|
stl_integrated = MINUS_20DB * stl_power;
|
|
|
|
if (stl_integrated < histogram_energy_boundaries[0]) {
|
|
index = 0;
|
|
} else {
|
|
index = find_histogram_index(stl_integrated);
|
|
if (stl_integrated > histogram_energies[index]) {
|
|
++index;
|
|
}
|
|
}
|
|
stl_size = 0;
|
|
for (j = index; j < 1000; ++j) {
|
|
stl_size += hist[j];
|
|
}
|
|
if (!stl_size) {
|
|
*out = 0.0;
|
|
return 0;
|
|
}
|
|
|
|
percentile_low = (size_t) ((stl_size - 1) * 0.1 + 0.5);
|
|
percentile_high = (size_t) ((stl_size - 1) * 0.95 + 0.5);
|
|
|
|
stl_size = 0;
|
|
j = index;
|
|
while (stl_size <= percentile_low) {
|
|
stl_size += hist[j++];
|
|
}
|
|
l_en = histogram_energies[j - 1];
|
|
while (stl_size <= percentile_high) {
|
|
stl_size += hist[j++];
|
|
}
|
|
h_en = histogram_energies[j - 1];
|
|
*out =
|
|
ebur128_energy_to_loudness(h_en) -
|
|
ebur128_energy_to_loudness(l_en);
|
|
return 0;
|
|
}
|
|
|
|
int ff_ebur128_loudness_range(FFEBUR128State * st, double *out)
|
|
{
|
|
return ff_ebur128_loudness_range_multiple(&st, 1, out);
|
|
}
|
|
|
|
int ff_ebur128_sample_peak(FFEBUR128State * st,
|
|
unsigned int channel_number, double *out)
|
|
{
|
|
if ((st->mode & FF_EBUR128_MODE_SAMPLE_PEAK) !=
|
|
FF_EBUR128_MODE_SAMPLE_PEAK) {
|
|
return AVERROR(EINVAL);
|
|
} else if (channel_number >= st->channels) {
|
|
return AVERROR(EINVAL);
|
|
}
|
|
*out = st->d->sample_peak[channel_number];
|
|
return 0;
|
|
}
|