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https://github.com/FFmpeg/FFmpeg.git
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330 lines
11 KiB
C
330 lines
11 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/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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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 sliding; ///< 1 if sliding mode, 0 otherwise
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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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} 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 = "640x480"}, 0, 0, FLAGS },
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{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x480"}, 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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{ NULL },
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};
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AVFILTER_DEFINE_CLASS(showspectrum);
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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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av_rdft_end(showspectrum->rdft);
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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_RGB24, 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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ShowSpectrumContext *showspectrum = ctx->priv;
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int i, rdft_bits, win_size;
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outlink->w = showspectrum->w;
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outlink->h = showspectrum->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*outlink->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;
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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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av_freep(&showspectrum->rdft_data);
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if (av_size_mult(sizeof(*showspectrum->rdft_data), 2 * win_size, &rdft_size) < 0)
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return AVERROR(EINVAL);
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showspectrum->rdft_data = av_malloc(rdft_size);
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if (!showspectrum->rdft_data)
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return AVERROR(ENOMEM);
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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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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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const int nb_channels = av_get_channel_layout_nb_channels(insamples->audio->channel_layout);
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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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int ch, n, y;
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FFTSample *data[2];
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const int nb_display_channels = FFMIN(nb_channels, 2);
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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 < 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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data[ch] = showspectrum->rdft_data + win_size * ch; // select channel buffer
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for (n = 0; n < add_samples; n++)
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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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/* run RDFT on each samples set */
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for (ch = 0; ch < nb_display_channels; ch++)
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av_rdft_calc(showspectrum->rdft, data[ch]);
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/* fill a new spectrum column */
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#define RE(ch) data[ch][2*y + 0]
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#define IM(ch) data[ch][2*y + 1]
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#define MAGNITUDE(re, im) sqrt((re)*(re) + (im)*(im))
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for (y = 0; y < outlink->h; y++) {
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// FIXME: bin[0] contains first and last bins
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uint8_t *p = outpicref->data[0] + (outlink->h - y - 1) * outpicref->linesize[0];
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const double w = 1. / sqrt(nb_freq);
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int a = sqrt(w * MAGNITUDE(RE(0), IM(0)));
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int b = nb_display_channels > 1 ? sqrt(w * MAGNITUDE(RE(1), IM(1))) : a;
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if (showspectrum->sliding) {
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memmove(p, p + 3, (outlink->w - 1) * 3);
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p += (outlink->w - 1) * 3;
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} else {
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p += showspectrum->xpos * 3;
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}
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a = FFMIN(a, 255);
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b = FFMIN(b, 255);
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p[0] = a;
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p[1] = b;
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p[2] = (a + b) / 2;
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}
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outpicref->pts = insamples->pts +
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av_rescale_q(showspectrum->consumed,
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(AVRational){ 1, inlink->sample_rate },
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outlink->time_base);
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push_frame(outlink);
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}
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return add_samples;
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}
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *insamples)
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{
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AVFilterContext *ctx = inlink->dst;
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ShowSpectrumContext *showspectrum = ctx->priv;
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int left_samples = insamples->audio->nb_samples;
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showspectrum->consumed = 0;
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while (left_samples) {
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const int added_samples = plot_spectrum_column(inlink, insamples, left_samples);
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showspectrum->consumed += added_samples;
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left_samples -= added_samples;
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}
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avfilter_unref_buffer(insamples);
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return 0;
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}
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static const AVFilterPad showspectrum_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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.min_perms = AV_PERM_READ,
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},
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{ NULL }
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};
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static const AVFilterPad showspectrum_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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.request_frame = request_frame,
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},
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{ NULL }
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};
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AVFilter avfilter_avf_showspectrum = {
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.name = "showspectrum",
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.description = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.priv_size = sizeof(ShowSpectrumContext),
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.inputs = showspectrum_inputs,
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.outputs = showspectrum_outputs,
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.priv_class = &showspectrum_class,
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};
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