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/* |
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* Copyright (c) 2016 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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/** |
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* @file |
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* SpectrumSynth filter |
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* @todo support float pixel format |
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*/ |
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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 "libavutil/parseutils.h" |
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#include "avfilter.h" |
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#include "formats.h" |
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#include "audio.h" |
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#include "video.h" |
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#include "internal.h" |
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#include "window_func.h" |
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enum MagnitudeScale { LINEAR, LOG, NB_SCALES }; |
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enum SlideMode { REPLACE, SCROLL, FULLFRAME, RSCROLL, NB_SLIDES }; |
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enum Orientation { VERTICAL, HORIZONTAL, NB_ORIENTATIONS }; |
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typedef struct SpectrumSynthContext { |
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const AVClass *class; |
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int sample_rate; |
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int channels; |
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int scale; |
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int sliding; |
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int win_func; |
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float overlap; |
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int orientation; |
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AVFrame *magnitude, *phase; |
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FFTContext *fft; ///< Fast Fourier Transform context |
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int fft_bits; ///< number of bits (FFT window size = 1<<fft_bits) |
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FFTComplex **fft_data; ///< bins holder for each (displayed) channels |
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int win_size; |
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int size; |
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int nb_freq; |
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int hop_size; |
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int start, end; |
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int xpos; |
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int xend; |
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int64_t pts; |
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float factor; |
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AVFrame *buffer; |
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float *window_func_lut; ///< Window function LUT |
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} SpectrumSynthContext; |
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#define OFFSET(x) offsetof(SpectrumSynthContext, x) |
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#define A AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM |
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#define V AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption spectrumsynth_options[] = { |
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{ "sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 15, INT_MAX, A }, |
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{ "channels", "set channels", OFFSET(channels), AV_OPT_TYPE_INT, {.i64 = 1}, 1, 8, A }, |
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{ "scale", "set input amplitude scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64 = LOG}, 0, NB_SCALES-1, V, "scale" }, |
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{ "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, V, "scale" }, |
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{ "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, V, "scale" }, |
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{ "slide", "set input sliding mode", OFFSET(sliding), AV_OPT_TYPE_INT, {.i64 = FULLFRAME}, 0, NB_SLIDES-1, V, "slide" }, |
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{ "replace", "consume old columns with new", 0, AV_OPT_TYPE_CONST, {.i64=REPLACE}, 0, 0, V, "slide" }, |
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{ "scroll", "consume only most right column", 0, AV_OPT_TYPE_CONST, {.i64=SCROLL}, 0, 0, V, "slide" }, |
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{ "fullframe", "consume full frames", 0, AV_OPT_TYPE_CONST, {.i64=FULLFRAME}, 0, 0, V, "slide" }, |
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{ "rscroll", "consume only most left column", 0, AV_OPT_TYPE_CONST, {.i64=RSCROLL}, 0, 0, V, "slide" }, |
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{ "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NB_WFUNC-1, A, "win_func" }, |
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{ "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, A, "win_func" }, |
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{ "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, A, "win_func" }, |
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{ "hann", "Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, A, "win_func" }, |
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{ "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, A, "win_func" }, |
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{ "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, A, "win_func" }, |
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{ "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, A, "win_func" }, |
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{ "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 1, A }, |
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{ "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, V, "orientation" }, |
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{ "vertical", NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL}, 0, 0, V, "orientation" }, |
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{ "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, V, "orientation" }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS(spectrumsynth); |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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SpectrumSynthContext *s = ctx->priv; |
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AVFilterFormats *formats = NULL; |
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AVFilterChannelLayouts *layout = NULL; |
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AVFilterLink *magnitude = ctx->inputs[0]; |
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AVFilterLink *phase = ctx->inputs[1]; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE }; |
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static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16, |
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P, |
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AV_PIX_FMT_YUV444P16, AV_PIX_FMT_NONE }; |
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int ret, sample_rates[] = { 48000, -1 }; |
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formats = ff_make_format_list(sample_fmts); |
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if ((ret = ff_formats_ref (formats, &outlink->in_formats )) < 0 || |
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(ret = ff_add_channel_layout (&layout, FF_COUNT2LAYOUT(s->channels))) < 0 || |
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(ret = ff_channel_layouts_ref (layout , &outlink->in_channel_layouts)) < 0) |
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return ret; |
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sample_rates[0] = s->sample_rate; |
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formats = ff_make_format_list(sample_rates); |
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if (!formats) |
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return AVERROR(ENOMEM); |
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if ((ret = ff_formats_ref(formats, &outlink->in_samplerates)) < 0) |
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return ret; |
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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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if ((ret = ff_formats_ref(formats, &magnitude->out_formats)) < 0) |
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return ret; |
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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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if ((ret = ff_formats_ref(formats, &phase->out_formats)) < 0) |
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return ret; |
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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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SpectrumSynthContext *s = ctx->priv; |
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int width = ctx->inputs[0]->w; |
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int height = ctx->inputs[0]->h; |
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AVRational time_base = ctx->inputs[0]->time_base; |
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AVRational frame_rate = ctx->inputs[0]->frame_rate; |
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int i, ch, fft_bits; |
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float factor, overlap; |
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outlink->sample_rate = s->sample_rate; |
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outlink->time_base = (AVRational){1, s->sample_rate}; |
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if (width != ctx->inputs[1]->w || |
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height != ctx->inputs[1]->h) { |
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av_log(ctx, AV_LOG_ERROR, |
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"Magnitude and Phase sizes differ (%dx%d vs %dx%d).\n", |
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width, height, |
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ctx->inputs[1]->w, ctx->inputs[1]->h); |
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return AVERROR_INVALIDDATA; |
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} else if (av_cmp_q(time_base, ctx->inputs[1]->time_base) != 0) { |
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av_log(ctx, AV_LOG_ERROR, |
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"Magnitude and Phase time bases differ (%d/%d vs %d/%d).\n", |
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time_base.num, time_base.den, |
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ctx->inputs[1]->time_base.num, |
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ctx->inputs[1]->time_base.den); |
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return AVERROR_INVALIDDATA; |
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} else if (av_cmp_q(frame_rate, ctx->inputs[1]->frame_rate) != 0) { |
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av_log(ctx, AV_LOG_ERROR, |
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"Magnitude and Phase framerates differ (%d/%d vs %d/%d).\n", |
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frame_rate.num, frame_rate.den, |
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ctx->inputs[1]->frame_rate.num, |
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ctx->inputs[1]->frame_rate.den); |
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return AVERROR_INVALIDDATA; |
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} |
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s->size = s->orientation == VERTICAL ? height / s->channels : width / s->channels; |
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s->xend = s->orientation == VERTICAL ? width : height; |
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for (fft_bits = 1; 1 << fft_bits < 2 * s->size; fft_bits++); |
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s->win_size = 1 << fft_bits; |
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s->nb_freq = 1 << (fft_bits - 1); |
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s->fft = av_fft_init(fft_bits, 1); |
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if (!s->fft) { |
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av_log(ctx, AV_LOG_ERROR, "Unable to create FFT context. " |
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"The window size might be too high.\n"); |
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return AVERROR(EINVAL); |
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} |
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s->fft_data = av_calloc(s->channels, sizeof(*s->fft_data)); |
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if (!s->fft_data) |
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return AVERROR(ENOMEM); |
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for (ch = 0; ch < s->channels; ch++) { |
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s->fft_data[ch] = av_calloc(s->win_size, sizeof(**s->fft_data)); |
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if (!s->fft_data[ch]) |
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return AVERROR(ENOMEM); |
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} |
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s->buffer = ff_get_audio_buffer(outlink, s->win_size * 2); |
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if (!s->buffer) |
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return AVERROR(ENOMEM); |
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/* pre-calc windowing function */ |
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s->window_func_lut = av_realloc_f(s->window_func_lut, s->win_size, |
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sizeof(*s->window_func_lut)); |
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if (!s->window_func_lut) |
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return AVERROR(ENOMEM); |
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ff_generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap); |
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if (s->overlap == 1) |
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s->overlap = overlap; |
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s->hop_size = (1 - s->overlap) * s->win_size; |
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for (factor = 0, i = 0; i < s->win_size; i++) { |
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factor += s->window_func_lut[i] * s->window_func_lut[i]; |
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} |
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s->factor = (factor / s->win_size) / FFMAX(1 / (1 - s->overlap) - 1, 1); |
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return 0; |
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} |
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static int request_frame(AVFilterLink *outlink) |
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{ |
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AVFilterContext *ctx = outlink->src; |
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SpectrumSynthContext *s = ctx->priv; |
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int ret; |
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if (!s->magnitude) { |
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ret = ff_request_frame(ctx->inputs[0]); |
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if (ret < 0) |
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return ret; |
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} |
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if (!s->phase) { |
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ret = ff_request_frame(ctx->inputs[1]); |
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if (ret < 0) |
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return ret; |
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} |
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return 0; |
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} |
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static void read16_fft_bin(SpectrumSynthContext *s, |
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int x, int y, int f, int ch) |
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{ |
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const int m_linesize = s->magnitude->linesize[0]; |
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const int p_linesize = s->phase->linesize[0]; |
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const uint16_t *m = (uint16_t *)(s->magnitude->data[0] + y * m_linesize); |
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const uint16_t *p = (uint16_t *)(s->phase->data[0] + y * p_linesize); |
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float magnitude, phase; |
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switch (s->scale) { |
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case LINEAR: |
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magnitude = m[x] / (double)UINT16_MAX; |
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break; |
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case LOG: |
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magnitude = ff_exp10(((m[x] / (double)UINT16_MAX) - 1.) * 6.); |
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break; |
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} |
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phase = ((p[x] / (double)UINT16_MAX) * 2. - 1.) * M_PI; |
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s->fft_data[ch][f].re = magnitude * cos(phase); |
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s->fft_data[ch][f].im = magnitude * sin(phase); |
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} |
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static void read8_fft_bin(SpectrumSynthContext *s, |
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int x, int y, int f, int ch) |
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{ |
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const int m_linesize = s->magnitude->linesize[0]; |
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const int p_linesize = s->phase->linesize[0]; |
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const uint8_t *m = (uint8_t *)(s->magnitude->data[0] + y * m_linesize); |
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const uint8_t *p = (uint8_t *)(s->phase->data[0] + y * p_linesize); |
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float magnitude, phase; |
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switch (s->scale) { |
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case LINEAR: |
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magnitude = m[x] / (double)UINT8_MAX; |
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break; |
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case LOG: |
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magnitude = ff_exp10(((m[x] / (double)UINT8_MAX) - 1.) * 6.); |
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break; |
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} |
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phase = ((p[x] / (double)UINT8_MAX) * 2. - 1.) * M_PI; |
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s->fft_data[ch][f].re = magnitude * cos(phase); |
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s->fft_data[ch][f].im = magnitude * sin(phase); |
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} |
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static void read_fft_data(AVFilterContext *ctx, int x, int h, int ch) |
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{ |
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SpectrumSynthContext *s = ctx->priv; |
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AVFilterLink *inlink = ctx->inputs[0]; |
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int start = h * (s->channels - ch) - 1; |
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int end = h * (s->channels - ch - 1); |
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int y, f; |
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switch (s->orientation) { |
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case VERTICAL: |
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switch (inlink->format) { |
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case AV_PIX_FMT_YUV444P16: |
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case AV_PIX_FMT_GRAY16: |
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for (y = start, f = 0; y >= end; y--, f++) { |
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read16_fft_bin(s, x, y, f, ch); |
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} |
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break; |
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case AV_PIX_FMT_YUVJ444P: |
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case AV_PIX_FMT_YUV444P: |
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case AV_PIX_FMT_GRAY8: |
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for (y = start, f = 0; y >= end; y--, f++) { |
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read8_fft_bin(s, x, y, f, ch); |
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} |
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break; |
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} |
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break; |
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case HORIZONTAL: |
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switch (inlink->format) { |
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case AV_PIX_FMT_YUV444P16: |
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case AV_PIX_FMT_GRAY16: |
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for (y = end, f = 0; y <= start; y++, f++) { |
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read16_fft_bin(s, y, x, f, ch); |
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} |
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break; |
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case AV_PIX_FMT_YUVJ444P: |
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case AV_PIX_FMT_YUV444P: |
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case AV_PIX_FMT_GRAY8: |
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for (y = end, f = 0; y <= start; y++, f++) { |
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read8_fft_bin(s, y, x, f, ch); |
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} |
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break; |
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} |
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break; |
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} |
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} |
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static void synth_window(AVFilterContext *ctx, int x) |
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{ |
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SpectrumSynthContext *s = ctx->priv; |
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const int h = s->size; |
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int nb = s->win_size; |
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int y, f, ch; |
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for (ch = 0; ch < s->channels; ch++) { |
|
|
|
read_fft_data(ctx, x, h, ch); |
|
|
|
|
|
|
|
for (y = h; y <= s->nb_freq; y++) { |
|
|
|
s->fft_data[ch][y].re = 0; |
|
|
|
s->fft_data[ch][y].im = 0; |
|
|
|
} |
|
|
|
|
|
|
|
for (y = s->nb_freq + 1, f = s->nb_freq - 1; y < nb; y++, f--) { |
|
|
|
s->fft_data[ch][y].re = s->fft_data[ch][f].re; |
|
|
|
s->fft_data[ch][y].im = -s->fft_data[ch][f].im; |
|
|
|
} |
|
|
|
|
|
|
|
av_fft_permute(s->fft, s->fft_data[ch]); |
|
|
|
av_fft_calc(s->fft, s->fft_data[ch]); |
|
|
|
} |
|
|
|
} |
|
|
|
|
|
|
|
static int try_push_frame(AVFilterContext *ctx, int x) |
|
|
|
{ |
|
|
|
SpectrumSynthContext *s = ctx->priv; |
|
|
|
AVFilterLink *outlink = ctx->outputs[0]; |
|
|
|
const float factor = s->factor; |
|
|
|
int ch, n, i, ret; |
|
|
|
int start, end; |
|
|
|
AVFrame *out; |
|
|
|
|
|
|
|
synth_window(ctx, x); |
|
|
|
|
|
|
|
for (ch = 0; ch < s->channels; ch++) { |
|
|
|
float *buf = (float *)s->buffer->extended_data[ch]; |
|
|
|
int j, k; |
|
|
|
|
|
|
|
start = s->start; |
|
|
|
end = s->end; |
|
|
|
k = end; |
|
|
|
for (i = 0, j = start; j < k && i < s->win_size; i++, j++) { |
|
|
|
buf[j] += s->fft_data[ch][i].re; |
|
|
|
} |
|
|
|
|
|
|
|
for (; i < s->win_size; i++, j++) { |
|
|
|
buf[j] = s->fft_data[ch][i].re; |
|
|
|
} |
|
|
|
|
|
|
|
start += s->hop_size; |
|
|
|
end = j; |
|
|
|
|
|
|
|
if (start >= s->win_size) { |
|
|
|
start -= s->win_size; |
|
|
|
end -= s->win_size; |
|
|
|
|
|
|
|
if (ch == s->channels - 1) { |
|
|
|
float *dst; |
|
|
|
|
|
|
|
out = ff_get_audio_buffer(outlink, s->win_size); |
|
|
|
if (!out) { |
|
|
|
av_frame_free(&s->magnitude); |
|
|
|
av_frame_free(&s->phase); |
|
|
|
return AVERROR(ENOMEM); |
|
|
|
} |
|
|
|
|
|
|
|
out->pts = s->pts; |
|
|
|
s->pts += s->win_size; |
|
|
|
for (int c = 0; c < s->channels; c++) { |
|
|
|
dst = (float *)out->extended_data[c]; |
|
|
|
buf = (float *)s->buffer->extended_data[c]; |
|
|
|
|
|
|
|
for (n = 0; n < s->win_size; n++) { |
|
|
|
dst[n] = buf[n] * factor; |
|
|
|
} |
|
|
|
memmove(buf, buf + s->win_size, s->win_size * 4); |
|
|
|
} |
|
|
|
|
|
|
|
ret = ff_filter_frame(outlink, out); |
|
|
|
} |
|
|
|
} |
|
|
|
} |
|
|
|
|
|
|
|
s->start = start; |
|
|
|
s->end = end; |
|
|
|
|
|
|
|
return 0; |
|
|
|
} |
|
|
|
|
|
|
|
static int try_push_frames(AVFilterContext *ctx) |
|
|
|
{ |
|
|
|
SpectrumSynthContext *s = ctx->priv; |
|
|
|
int ret, x; |
|
|
|
|
|
|
|
if (!(s->magnitude && s->phase)) |
|
|
|
return 0; |
|
|
|
|
|
|
|
switch (s->sliding) { |
|
|
|
case REPLACE: |
|
|
|
ret = try_push_frame(ctx, s->xpos); |
|
|
|
s->xpos++; |
|
|
|
if (s->xpos >= s->xend) |
|
|
|
s->xpos = 0; |
|
|
|
break; |
|
|
|
case SCROLL: |
|
|
|
s->xpos = s->xend - 1; |
|
|
|
ret = try_push_frame(ctx, s->xpos); |
|
|
|
case RSCROLL: |
|
|
|
s->xpos = 0; |
|
|
|
ret = try_push_frame(ctx, s->xpos); |
|
|
|
break; |
|
|
|
break; |
|
|
|
case FULLFRAME: |
|
|
|
for (x = 0; x < s->xend; x++) { |
|
|
|
ret = try_push_frame(ctx, x); |
|
|
|
if (ret < 0) |
|
|
|
break; |
|
|
|
} |
|
|
|
break; |
|
|
|
} |
|
|
|
|
|
|
|
av_frame_free(&s->magnitude); |
|
|
|
av_frame_free(&s->phase); |
|
|
|
return ret; |
|
|
|
} |
|
|
|
|
|
|
|
static int filter_frame_magnitude(AVFilterLink *inlink, AVFrame *magnitude) |
|
|
|
{ |
|
|
|
AVFilterContext *ctx = inlink->dst; |
|
|
|
SpectrumSynthContext *s = ctx->priv; |
|
|
|
|
|
|
|
s->magnitude = magnitude; |
|
|
|
return try_push_frames(ctx); |
|
|
|
} |
|
|
|
|
|
|
|
static int filter_frame_phase(AVFilterLink *inlink, AVFrame *phase) |
|
|
|
{ |
|
|
|
AVFilterContext *ctx = inlink->dst; |
|
|
|
SpectrumSynthContext *s = ctx->priv; |
|
|
|
|
|
|
|
s->phase = phase; |
|
|
|
return try_push_frames(ctx); |
|
|
|
} |
|
|
|
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx) |
|
|
|
{ |
|
|
|
SpectrumSynthContext *s = ctx->priv; |
|
|
|
int i; |
|
|
|
|
|
|
|
av_frame_free(&s->magnitude); |
|
|
|
av_frame_free(&s->phase); |
|
|
|
av_frame_free(&s->buffer); |
|
|
|
av_fft_end(s->fft); |
|
|
|
if (s->fft_data) { |
|
|
|
for (i = 0; i < s->channels; i++) |
|
|
|
av_freep(&s->fft_data[i]); |
|
|
|
} |
|
|
|
av_freep(&s->fft_data); |
|
|
|
av_freep(&s->window_func_lut); |
|
|
|
} |
|
|
|
|
|
|
|
static const AVFilterPad spectrumsynth_inputs[] = { |
|
|
|
{ |
|
|
|
.name = "magnitude", |
|
|
|
.type = AVMEDIA_TYPE_VIDEO, |
|
|
|
.filter_frame = filter_frame_magnitude, |
|
|
|
.needs_fifo = 1, |
|
|
|
}, |
|
|
|
{ |
|
|
|
.name = "phase", |
|
|
|
.type = AVMEDIA_TYPE_VIDEO, |
|
|
|
.filter_frame = filter_frame_phase, |
|
|
|
.needs_fifo = 1, |
|
|
|
}, |
|
|
|
{ NULL } |
|
|
|
}; |
|
|
|
|
|
|
|
static const AVFilterPad spectrumsynth_outputs[] = { |
|
|
|
{ |
|
|
|
.name = "default", |
|
|
|
.type = AVMEDIA_TYPE_AUDIO, |
|
|
|
.config_props = config_output, |
|
|
|
.request_frame = request_frame, |
|
|
|
}, |
|
|
|
{ NULL } |
|
|
|
}; |
|
|
|
|
|
|
|
AVFilter ff_vaf_spectrumsynth = { |
|
|
|
.name = "spectrumsynth", |
|
|
|
.description = NULL_IF_CONFIG_SMALL("Convert input spectrum videos to audio output."), |
|
|
|
.uninit = uninit, |
|
|
|
.query_formats = query_formats, |
|
|
|
.priv_size = sizeof(SpectrumSynthContext), |
|
|
|
.inputs = spectrumsynth_inputs, |
|
|
|
.outputs = spectrumsynth_outputs, |
|
|
|
.priv_class = &spectrumsynth_class, |
|
|
|
}; |