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https://github.com/FFmpeg/FFmpeg.git
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790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
211 lines
5.6 KiB
C
211 lines
5.6 KiB
C
/*
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* Copyright (c) 2018 Paul B Mahol
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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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#include <float.h>
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#include "libavutil/ffmath.h"
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#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "internal.h"
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#define BINS 32768
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typedef struct ChannelStats {
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uint64_t nb_samples;
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uint64_t blknum;
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float peak;
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float sum;
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uint32_t peaks[BINS+1];
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uint32_t rms[BINS+1];
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} ChannelStats;
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typedef struct DRMeterContext {
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const AVClass *class;
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ChannelStats *chstats;
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int nb_channels;
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int64_t tc_samples;
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double time_constant;
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} DRMeterContext;
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#define OFFSET(x) offsetof(DRMeterContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption drmeter_options[] = {
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{ "length", "set the window length", OFFSET(time_constant), AV_OPT_TYPE_DOUBLE, {.dbl=3}, .01, 10, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(drmeter);
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static int config_output(AVFilterLink *outlink)
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{
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DRMeterContext *s = outlink->src->priv;
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s->chstats = av_calloc(outlink->ch_layout.nb_channels, sizeof(*s->chstats));
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if (!s->chstats)
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return AVERROR(ENOMEM);
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s->nb_channels = outlink->ch_layout.nb_channels;
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s->tc_samples = lrint(s->time_constant * outlink->sample_rate);
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return 0;
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}
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static void finish_block(ChannelStats *p)
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{
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int peak_bin, rms_bin;
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float peak, rms;
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rms = sqrtf(2.f * p->sum / p->nb_samples);
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peak = p->peak;
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rms_bin = av_clip(lrintf(rms * BINS), 0, BINS);
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peak_bin = av_clip(lrintf(peak * BINS), 0, BINS);
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p->rms[rms_bin]++;
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p->peaks[peak_bin]++;
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p->peak = 0;
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p->sum = 0;
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p->nb_samples = 0;
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p->blknum++;
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}
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static void update_stat(DRMeterContext *s, ChannelStats *p, float sample)
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{
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p->peak = fmaxf(fabsf(sample), p->peak);
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p->sum += sample * sample;
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p->nb_samples++;
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if (p->nb_samples >= s->tc_samples)
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finish_block(p);
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
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{
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DRMeterContext *s = inlink->dst->priv;
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const int channels = s->nb_channels;
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switch (inlink->format) {
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case AV_SAMPLE_FMT_FLTP:
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for (int c = 0; c < channels; c++) {
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ChannelStats *p = &s->chstats[c];
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const float *src = (const float *)buf->extended_data[c];
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for (int i = 0; i < buf->nb_samples; i++, src++)
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update_stat(s, p, *src);
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}
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break;
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case AV_SAMPLE_FMT_FLT: {
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const float *src = (const float *)buf->extended_data[0];
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for (int i = 0; i < buf->nb_samples; i++) {
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for (int c = 0; c < channels; c++, src++)
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update_stat(s, &s->chstats[c], *src);
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}}
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break;
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}
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return ff_filter_frame(inlink->dst->outputs[0], buf);
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}
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#define SQR(a) ((a)*(a))
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static void print_stats(AVFilterContext *ctx)
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{
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DRMeterContext *s = ctx->priv;
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float dr = 0.f;
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for (int ch = 0; ch < s->nb_channels; ch++) {
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ChannelStats *p = &s->chstats[ch];
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float chdr, secondpeak, rmssum = 0.f;
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int first = 0, last = lrintf(0.2f * p->blknum);
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int peak_bin = BINS;
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if (!p->nb_samples) {
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av_log(ctx, AV_LOG_INFO, "No data, dynamic range not meassurable\n");
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return;
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}
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if (p->nb_samples)
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finish_block(p);
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for (int i = BINS; i >= 0; i--) {
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if (p->peaks[i]) {
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if (first || p->peaks[i] > 1) {
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peak_bin = i;
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break;
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}
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first = 1;
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}
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}
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secondpeak = peak_bin / (float)BINS;
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for (int64_t i = BINS, j = 0; i >= 0 && j < last; i--) {
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if (p->rms[i]) {
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rmssum += SQR(i / (float)BINS) * p->rms[i];
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j += p->rms[i];
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}
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}
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chdr = 20.f * log10f(secondpeak / sqrtf(rmssum / (float)last));
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dr += chdr;
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av_log(ctx, AV_LOG_INFO, "Channel %d: DR: %g\n", ch + 1, chdr);
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}
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av_log(ctx, AV_LOG_INFO, "Overall DR: %g\n", dr / s->nb_channels);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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DRMeterContext *s = ctx->priv;
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if (s->nb_channels)
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print_stats(ctx);
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av_freep(&s->chstats);
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}
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static const AVFilterPad drmeter_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = filter_frame,
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},
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};
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static const AVFilterPad drmeter_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.config_props = config_output,
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},
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};
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const AVFilter ff_af_drmeter = {
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.name = "drmeter",
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.description = NULL_IF_CONFIG_SMALL("Measure audio dynamic range."),
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.priv_size = sizeof(DRMeterContext),
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.priv_class = &drmeter_class,
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.uninit = uninit,
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.flags = AVFILTER_FLAG_METADATA_ONLY,
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FILTER_INPUTS(drmeter_inputs),
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FILTER_OUTPUTS(drmeter_outputs),
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FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_FLT),
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};
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