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510 lines
20 KiB
C
510 lines
20 KiB
C
/*
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* Copyright (c) 2012 Clément Bœsch
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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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* audio to spectrum (video) transmedia filter, based on ffplay rdft showmode
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* (by Michael Niedermayer) and lavfi/avf_showwaves (by Stefano Sabatini).
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*/
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#include <math.h>
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#include "libavcodec/avfft.h"
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#include "libavutil/avassert.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "internal.h"
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enum DisplayMode { COMBINED, SEPARATE, NB_MODES };
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enum DisplayScale { LINEAR, SQRT, CBRT, LOG, NB_SCALES };
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enum ColorMode { CHANNEL, INTENSITY, NB_CLMODES };
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typedef struct {
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const AVClass *class;
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int w, h;
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AVFilterBufferRef *outpicref;
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int req_fullfilled;
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int nb_display_channels;
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int channel_height;
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int sliding; ///< 1 if sliding mode, 0 otherwise
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enum DisplayMode mode; ///< channel display mode
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enum ColorMode color_mode; ///< display color scheme
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enum DisplayScale scale;
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float saturation; ///< color saturation multiplier
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int xpos; ///< x position (current column)
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RDFTContext *rdft; ///< Real Discrete Fourier Transform context
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int rdft_bits; ///< number of bits (RDFT window size = 1<<rdft_bits)
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FFTSample **rdft_data; ///< bins holder for each (displayed) channels
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int filled; ///< number of samples (per channel) filled in current rdft_buffer
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int consumed; ///< number of samples (per channel) consumed from the input frame
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float *window_func_lut; ///< Window function LUT
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float *combine_buffer; ///< color combining buffer (3 * h items)
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} ShowSpectrumContext;
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#define OFFSET(x) offsetof(ShowSpectrumContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption showspectrum_options[] = {
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{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x512"}, 0, 0, FLAGS },
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{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x512"}, 0, 0, FLAGS },
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{ "slide", "set sliding mode", OFFSET(sliding), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS },
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{ "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, COMBINED, NB_MODES-1, FLAGS, "mode" },
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{ "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" },
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{ "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" },
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{ "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=CHANNEL}, CHANNEL, NB_CLMODES-1, FLAGS, "color" },
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{ "channel", "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL}, 0, 0, FLAGS, "color" },
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{ "intensity", "intensity based coloring", 0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" },
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{ "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=SQRT}, LINEAR, NB_SCALES-1, FLAGS, "scale" },
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{ "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT}, 0, 0, FLAGS, "scale" },
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{ "cbrt", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64=CBRT}, 0, 0, FLAGS, "scale" },
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{ "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, FLAGS, "scale" },
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{ "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },
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{ "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },
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{ NULL },
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};
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AVFILTER_DEFINE_CLASS(showspectrum);
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static const struct {
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float a, y, u, v;
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} intensity_color_table[] = {
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{ 0, 0, 0, 0 },
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{ 0.13, .03587126228984074, .1573300977624594, -.02548747583751842 },
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{ 0.30, .18572281794568020, .1772436246393981, .17475554840414750 },
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{ 0.60, .28184980583656130, -.1593064119945782, .47132074554608920 },
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{ 0.73, .65830621175547810, -.3716070802232764, .24352759331252930 },
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{ 0.78, .76318535758242900, -.4307467689263783, .16866496622310430 },
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{ 0.91, .95336363636363640, -.2045454545454546, .03313636363636363 },
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{ 1, 1, 0, 0 }
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};
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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ShowSpectrumContext *showspectrum = ctx->priv;
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int err;
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showspectrum->class = &showspectrum_class;
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av_opt_set_defaults(showspectrum);
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if ((err = av_set_options_string(showspectrum, args, "=", ":")) < 0)
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return err;
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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ShowSpectrumContext *showspectrum = ctx->priv;
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int i;
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av_freep(&showspectrum->combine_buffer);
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av_rdft_end(showspectrum->rdft);
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for (i = 0; i < showspectrum->nb_display_channels; i++)
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av_freep(&showspectrum->rdft_data[i]);
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av_freep(&showspectrum->rdft_data);
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av_freep(&showspectrum->window_func_lut);
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avfilter_unref_bufferp(&showspectrum->outpicref);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats = NULL;
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AVFilterChannelLayouts *layouts = NULL;
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_NONE };
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static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE };
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/* set input audio formats */
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formats = ff_make_format_list(sample_fmts);
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if (!formats)
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return AVERROR(ENOMEM);
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ff_formats_ref(formats, &inlink->out_formats);
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layouts = ff_all_channel_layouts();
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if (!layouts)
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return AVERROR(ENOMEM);
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ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts);
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formats = ff_all_samplerates();
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if (!formats)
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return AVERROR(ENOMEM);
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ff_formats_ref(formats, &inlink->out_samplerates);
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/* set output video format */
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formats = ff_make_format_list(pix_fmts);
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if (!formats)
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return AVERROR(ENOMEM);
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ff_formats_ref(formats, &outlink->in_formats);
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *inlink = ctx->inputs[0];
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ShowSpectrumContext *showspectrum = ctx->priv;
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int i, rdft_bits, win_size, h;
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outlink->w = showspectrum->w;
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outlink->h = showspectrum->h;
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h = (showspectrum->mode == COMBINED) ? outlink->h : outlink->h / inlink->channels;
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showspectrum->channel_height = h;
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/* RDFT window size (precision) according to the requested output frame height */
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for (rdft_bits = 1; 1 << rdft_bits < 2 * h; rdft_bits++);
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win_size = 1 << rdft_bits;
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/* (re-)configuration if the video output changed (or first init) */
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if (rdft_bits != showspectrum->rdft_bits) {
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size_t rdft_size, rdft_listsize;
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AVFilterBufferRef *outpicref;
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av_rdft_end(showspectrum->rdft);
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showspectrum->rdft = av_rdft_init(rdft_bits, DFT_R2C);
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showspectrum->rdft_bits = rdft_bits;
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/* RDFT buffers: x2 for each (display) channel buffer.
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* Note: we use free and malloc instead of a realloc-like function to
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* make sure the buffer is aligned in memory for the FFT functions. */
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for (i = 0; i < showspectrum->nb_display_channels; i++)
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av_freep(&showspectrum->rdft_data[i]);
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av_freep(&showspectrum->rdft_data);
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showspectrum->nb_display_channels = inlink->channels;
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if (av_size_mult(sizeof(*showspectrum->rdft_data),
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showspectrum->nb_display_channels, &rdft_listsize) < 0)
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return AVERROR(EINVAL);
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if (av_size_mult(sizeof(**showspectrum->rdft_data),
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win_size, &rdft_size) < 0)
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return AVERROR(EINVAL);
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showspectrum->rdft_data = av_malloc(rdft_listsize);
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if (!showspectrum->rdft_data)
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return AVERROR(ENOMEM);
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for (i = 0; i < showspectrum->nb_display_channels; i++) {
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showspectrum->rdft_data[i] = av_malloc(rdft_size);
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if (!showspectrum->rdft_data[i])
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return AVERROR(ENOMEM);
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}
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showspectrum->filled = 0;
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/* pre-calc windowing function (hann here) */
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showspectrum->window_func_lut =
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av_realloc_f(showspectrum->window_func_lut, win_size,
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sizeof(*showspectrum->window_func_lut));
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if (!showspectrum->window_func_lut)
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return AVERROR(ENOMEM);
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for (i = 0; i < win_size; i++)
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showspectrum->window_func_lut[i] = .5f * (1 - cos(2*M_PI*i / (win_size-1)));
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/* prepare the initial picref buffer (black frame) */
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avfilter_unref_bufferp(&showspectrum->outpicref);
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showspectrum->outpicref = outpicref =
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ff_get_video_buffer(outlink, AV_PERM_WRITE|AV_PERM_PRESERVE|AV_PERM_REUSE2,
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outlink->w, outlink->h);
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if (!outpicref)
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return AVERROR(ENOMEM);
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outlink->sample_aspect_ratio = (AVRational){1,1};
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memset(outpicref->data[0], 0, outlink->h * outpicref->linesize[0]);
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}
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if (showspectrum->xpos >= outlink->w)
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showspectrum->xpos = 0;
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showspectrum->combine_buffer =
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av_realloc_f(showspectrum->combine_buffer, outlink->h * 3,
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sizeof(*showspectrum->combine_buffer));
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av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d RDFT window size:%d\n",
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showspectrum->w, showspectrum->h, win_size);
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return 0;
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}
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inline static void push_frame(AVFilterLink *outlink)
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{
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ShowSpectrumContext *showspectrum = outlink->src->priv;
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showspectrum->xpos++;
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if (showspectrum->xpos >= outlink->w)
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showspectrum->xpos = 0;
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showspectrum->filled = 0;
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showspectrum->req_fullfilled = 1;
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ff_filter_frame(outlink, avfilter_ref_buffer(showspectrum->outpicref, ~AV_PERM_WRITE));
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}
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static int request_frame(AVFilterLink *outlink)
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{
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ShowSpectrumContext *showspectrum = outlink->src->priv;
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AVFilterLink *inlink = outlink->src->inputs[0];
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int ret;
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showspectrum->req_fullfilled = 0;
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do {
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ret = ff_request_frame(inlink);
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} while (!showspectrum->req_fullfilled && ret >= 0);
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if (ret == AVERROR_EOF && showspectrum->outpicref)
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push_frame(outlink);
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return ret;
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}
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static int plot_spectrum_column(AVFilterLink *inlink, AVFilterBufferRef *insamples, int nb_samples)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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ShowSpectrumContext *showspectrum = ctx->priv;
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AVFilterBufferRef *outpicref = showspectrum->outpicref;
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/* nb_freq contains the power of two superior or equal to the output image
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* height (or half the RDFT window size) */
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const int nb_freq = 1 << (showspectrum->rdft_bits - 1);
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const int win_size = nb_freq << 1;
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const double w = 1. / (sqrt(nb_freq) * 32768.);
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int ch, plane, n, y;
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const int start = showspectrum->filled;
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const int add_samples = FFMIN(win_size - start, nb_samples);
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/* fill RDFT input with the number of samples available */
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for (ch = 0; ch < showspectrum->nb_display_channels; ch++) {
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const int16_t *p = (int16_t *)insamples->extended_data[ch];
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p += showspectrum->consumed;
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for (n = 0; n < add_samples; n++)
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showspectrum->rdft_data[ch][start + n] = p[n] * showspectrum->window_func_lut[start + n];
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}
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showspectrum->filled += add_samples;
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/* complete RDFT window size? */
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if (showspectrum->filled == win_size) {
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/* channel height */
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int h = showspectrum->channel_height;
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/* run RDFT on each samples set */
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for (ch = 0; ch < showspectrum->nb_display_channels; ch++)
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av_rdft_calc(showspectrum->rdft, showspectrum->rdft_data[ch]);
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/* fill a new spectrum column */
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#define RE(y, ch) showspectrum->rdft_data[ch][2 * y + 0]
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#define IM(y, ch) showspectrum->rdft_data[ch][2 * y + 1]
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#define MAGNITUDE(y, ch) hypot(RE(y, ch), IM(y, ch))
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/* initialize buffer for combining to black */
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for (y = 0; y < outlink->h; y++) {
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showspectrum->combine_buffer[3 * y ] = 0;
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showspectrum->combine_buffer[3 * y + 1] = 127.5;
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showspectrum->combine_buffer[3 * y + 2] = 127.5;
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}
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for (ch = 0; ch < showspectrum->nb_display_channels; ch++) {
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float yf, uf, vf;
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/* decide color range */
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switch (showspectrum->mode) {
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case COMBINED:
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// reduce range by channel count
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yf = 256.0f / showspectrum->nb_display_channels;
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switch (showspectrum->color_mode) {
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case INTENSITY:
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uf = yf;
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vf = yf;
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break;
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case CHANNEL:
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/* adjust saturation for mixed UV coloring */
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/* this factor is correct for infinite channels, an approximation otherwise */
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uf = yf * M_PI;
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vf = yf * M_PI;
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break;
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default:
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av_assert0(0);
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}
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break;
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case SEPARATE:
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// full range
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yf = 256.0f;
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uf = 256.0f;
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vf = 256.0f;
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break;
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default:
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av_assert0(0);
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}
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if (showspectrum->color_mode == CHANNEL) {
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if (showspectrum->nb_display_channels > 1) {
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uf *= 0.5 * sin((2 * M_PI * ch) / showspectrum->nb_display_channels);
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vf *= 0.5 * cos((2 * M_PI * ch) / showspectrum->nb_display_channels);
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} else {
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uf = 0.0f;
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vf = 0.0f;
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}
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}
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uf *= showspectrum->saturation;
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vf *= showspectrum->saturation;
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/* draw the channel */
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for (y = 0; y < h; y++) {
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int row = (showspectrum->mode == COMBINED) ? y : ch * h + y;
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float *out = &showspectrum->combine_buffer[3 * row];
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/* get magnitude */
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float a = w * MAGNITUDE(y, ch);
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/* apply scale */
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switch (showspectrum->scale) {
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case LINEAR:
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break;
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case SQRT:
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a = sqrt(a);
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break;
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case CBRT:
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a = cbrt(a);
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break;
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case LOG:
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a = 1 - log(FFMAX(FFMIN(1, a), 1e-6)) / log(1e-6); // zero = -120dBFS
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break;
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default:
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av_assert0(0);
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}
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if (showspectrum->color_mode == INTENSITY) {
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float y, u, v;
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int i;
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for (i = 1; i < sizeof(intensity_color_table) / sizeof(*intensity_color_table) - 1; i++)
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if (intensity_color_table[i].a >= a)
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break;
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// i now is the first item >= the color
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// now we know to interpolate between item i - 1 and i
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if (a <= intensity_color_table[i - 1].a) {
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y = intensity_color_table[i - 1].y;
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u = intensity_color_table[i - 1].u;
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v = intensity_color_table[i - 1].v;
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} else if (a >= intensity_color_table[i].a) {
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y = intensity_color_table[i].y;
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u = intensity_color_table[i].u;
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v = intensity_color_table[i].v;
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} else {
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float start = intensity_color_table[i - 1].a;
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float end = intensity_color_table[i].a;
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float lerpfrac = (a - start) / (end - start);
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y = intensity_color_table[i - 1].y * (1.0f - lerpfrac)
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+ intensity_color_table[i].y * lerpfrac;
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u = intensity_color_table[i - 1].u * (1.0f - lerpfrac)
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+ intensity_color_table[i].u * lerpfrac;
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v = intensity_color_table[i - 1].v * (1.0f - lerpfrac)
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+ intensity_color_table[i].v * lerpfrac;
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}
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out[0] += y * yf;
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out[1] += u * uf;
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out[2] += v * vf;
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} else {
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out[0] += a * yf;
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out[1] += a * uf;
|
|
out[2] += a * vf;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* copy to output */
|
|
if (showspectrum->sliding) {
|
|
for (plane = 0; plane < 3; plane++) {
|
|
for (y = 0; y < outlink->h; y++) {
|
|
uint8_t *p = outpicref->data[plane] +
|
|
y * outpicref->linesize[plane];
|
|
memmove(p, p + 1, outlink->w - 1);
|
|
}
|
|
}
|
|
showspectrum->xpos = outlink->w - 1;
|
|
}
|
|
for (plane = 0; plane < 3; plane++) {
|
|
uint8_t *p = outpicref->data[plane] +
|
|
(outlink->h - 1) * outpicref->linesize[plane] +
|
|
showspectrum->xpos;
|
|
for (y = 0; y < outlink->h; y++) {
|
|
*p = rint(FFMAX(0, FFMIN(showspectrum->combine_buffer[3 * y + plane], 255)));
|
|
p -= outpicref->linesize[plane];
|
|
}
|
|
}
|
|
|
|
outpicref->pts = insamples->pts +
|
|
av_rescale_q(showspectrum->consumed,
|
|
(AVRational){ 1, inlink->sample_rate },
|
|
outlink->time_base);
|
|
push_frame(outlink);
|
|
}
|
|
|
|
return add_samples;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *insamples)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
ShowSpectrumContext *showspectrum = ctx->priv;
|
|
int left_samples = insamples->audio->nb_samples;
|
|
|
|
showspectrum->consumed = 0;
|
|
while (left_samples) {
|
|
const int added_samples = plot_spectrum_column(inlink, insamples, left_samples);
|
|
showspectrum->consumed += added_samples;
|
|
left_samples -= added_samples;
|
|
}
|
|
|
|
avfilter_unref_buffer(insamples);
|
|
return 0;
|
|
}
|
|
|
|
static const AVFilterPad showspectrum_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.filter_frame = filter_frame,
|
|
.min_perms = AV_PERM_READ,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad showspectrum_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_output,
|
|
.request_frame = request_frame,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter avfilter_avf_showspectrum = {
|
|
.name = "showspectrum",
|
|
.description = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."),
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
.priv_size = sizeof(ShowSpectrumContext),
|
|
.inputs = showspectrum_inputs,
|
|
.outputs = showspectrum_outputs,
|
|
.priv_class = &showspectrum_class,
|
|
};
|