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/* |
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* Copyright (c) 2019 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <float.h> |
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#include <math.h> |
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#include "libavcodec/avfft.h" |
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#include "libavutil/audio_fifo.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 "audio.h" |
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#include "video.h" |
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#include "avfilter.h" |
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#include "filters.h" |
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#include "internal.h" |
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#include "window_func.h" |
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typedef struct ShowSpatialContext { |
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const AVClass *class; |
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int w, h; |
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AVRational frame_rate; |
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FFTContext *fft[2]; ///< Fast Fourier Transform context |
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FFTContext *ifft[2]; ///< Inverse 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[2]; ///< bins holder for each (displayed) channels |
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float *window_func_lut; ///< Window function LUT |
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int win_func; |
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int win_size; |
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int buf_size; |
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float overlap; |
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int consumed; |
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int hop_size; |
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AVAudioFifo *fifo; |
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int64_t pts; |
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} ShowSpatialContext; |
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#define OFFSET(x) offsetof(ShowSpatialContext, x) |
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption showspatial_options[] = { |
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{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "512x512"}, 0, 0, FLAGS }, |
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{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "512x512"}, 0, 0, FLAGS }, |
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{ "win_size", "set window size", OFFSET(win_size), AV_OPT_TYPE_INT, {.i64 = 4096}, 1024, 65536, FLAGS }, |
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{ "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" }, |
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{ "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" }, |
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{ "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" }, |
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{ "hann", "Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" }, |
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{ "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" }, |
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{ "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" }, |
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{ "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" }, |
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{ "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" }, |
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{ "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" }, |
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{ "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" }, |
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{ "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" }, |
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{ "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" }, |
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{ "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" }, |
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{ "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" }, |
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{ "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, FLAGS, "win_func" }, |
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{ "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, FLAGS, "win_func" }, |
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{ "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" }, |
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{ "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" }, |
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{ "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, FLAGS, "win_func" }, |
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{ "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, FLAGS, "win_func" }, |
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{ "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, FLAGS, "win_func" }, |
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{ "bohman", "Bohman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN}, 0, 0, FLAGS, "win_func" }, |
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{ "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0, 1, FLAGS }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS(showspatial); |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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ShowSpatialContext *s = ctx->priv; |
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int i; |
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for (i = 0; i < 2; i++) |
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av_fft_end(s->fft[i]); |
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for (i = 0; i < 2; i++) |
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av_fft_end(s->ifft[i]); |
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for (i = 0; i < 2; i++) |
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av_freep(&s->fft_data[i]); |
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av_freep(&s->window_func_lut); |
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av_audio_fifo_free(s->fifo); |
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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 *layout = 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_FLTP, AV_SAMPLE_FMT_NONE }; |
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static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GBRP, AV_PIX_FMT_NONE }; |
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int ret; |
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formats = ff_make_format_list(sample_fmts); |
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if ((ret = ff_formats_ref (formats, &inlink->out_formats )) < 0 || |
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(ret = ff_add_channel_layout (&layout, AV_CH_LAYOUT_STEREO )) < 0 || |
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(ret = ff_channel_layouts_ref (layout , &inlink->out_channel_layouts)) < 0) |
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return ret; |
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formats = ff_all_samplerates(); |
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if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0) |
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return ret; |
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formats = ff_make_format_list(pix_fmts); |
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if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0) |
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return ret; |
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return 0; |
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} |
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static int run_channel_fft(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) |
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{ |
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ShowSpatialContext *s = ctx->priv; |
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const float *window_func_lut = s->window_func_lut; |
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AVFrame *fin = arg; |
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const int ch = jobnr; |
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const float *p = (float *)fin->extended_data[ch]; |
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for (int n = 0; n < fin->nb_samples; n++) { |
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s->fft_data[ch][n].re = p[n] * window_func_lut[n]; |
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s->fft_data[ch][n].im = 0; |
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} |
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av_fft_permute(s->fft[ch], s->fft_data[ch]); |
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av_fft_calc(s->fft[ch], s->fft_data[ch]); |
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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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ShowSpatialContext *s = ctx->priv; |
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int i, fft_bits; |
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float overlap; |
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outlink->w = s->w; |
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outlink->h = s->h; |
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outlink->sample_aspect_ratio = (AVRational){1,1}; |
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s->buf_size = 1 << av_log2(s->win_size); |
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s->win_size = s->buf_size; |
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fft_bits = av_log2(s->win_size); |
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/* (re-)configuration if the video output changed (or first init) */ |
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if (fft_bits != s->fft_bits) { |
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s->fft_bits = fft_bits; |
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/* FFT buffers: x2 for each 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 < 2; i++) { |
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av_fft_end(s->fft[i]); |
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av_freep(&s->fft_data[i]); |
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} |
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for (i = 0; i < 2; i++) { |
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s->fft[i] = av_fft_init(fft_bits, 0); |
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if (!s->fft[i]) { |
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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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} |
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for (i = 0; i < 2; i++) { |
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s->fft_data[i] = av_calloc(s->buf_size, sizeof(**s->fft_data)); |
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if (!s->fft_data[i]) |
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return AVERROR(ENOMEM); |
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} |
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/* pre-calc windowing function */ |
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s->window_func_lut = |
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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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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.f - s->overlap) * s->win_size; |
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if (s->hop_size < 1) { |
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av_log(ctx, AV_LOG_ERROR, "overlap %f too big\n", s->overlap); |
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return AVERROR(EINVAL); |
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} |
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} |
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outlink->time_base = av_inv_q(outlink->frame_rate); |
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av_audio_fifo_free(s->fifo); |
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s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->win_size); |
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if (!s->fifo) |
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return AVERROR(ENOMEM); |
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return 0; |
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} |
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#define RE(y, ch) s->fft_data[ch][y].re |
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#define IM(y, ch) s->fft_data[ch][y].im |
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static void draw_dot(uint8_t *dst, int linesize, int value) |
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{ |
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dst[0] = value; |
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dst[1] = value; |
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dst[-1] = value; |
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dst[linesize] = value; |
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dst[-linesize] = value; |
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} |
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static int draw_spatial(AVFilterLink *inlink, AVFrame *insamples) |
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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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ShowSpatialContext *s = ctx->priv; |
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AVFrame *outpicref; |
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int h = s->h - 2; |
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int w = s->w - 2; |
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int z = s->win_size / 2; |
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outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
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if (!outpicref) |
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return AVERROR(ENOMEM); |
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outpicref->sample_aspect_ratio = (AVRational){1,1}; |
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for (int i = 0; i < outlink->h; i++) { |
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memset(outpicref->data[0] + i * outpicref->linesize[0], 0, outlink->w); |
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memset(outpicref->data[1] + i * outpicref->linesize[1], 0, outlink->w); |
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memset(outpicref->data[2] + i * outpicref->linesize[2], 0, outlink->w); |
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} |
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for (int j = 0; j < z; j++) { |
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const int idx = z - 1 - j; |
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float l = hypotf(RE(idx, 0), IM(idx, 0)); |
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float r = hypotf(RE(idx, 1), IM(idx, 1)); |
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float sum = l + r; |
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float lp = atan2f(IM(idx, 0), RE(idx, 0)); |
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float rp = atan2f(IM(idx, 1), RE(idx, 1)); |
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float diffp = ((rp - lp) / (2.f * M_PI) + 1.f) * 0.5f; |
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float diff = (sum < 0.000001f ? 0.f : (r - l) / sum) * 0.5f + 0.5f; |
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float cr = av_clipf(cbrtf(l / sum), 0, 1) * 255.f; |
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float cb = av_clipf(cbrtf(r / sum), 0, 1) * 255.f; |
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float cg; |
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int x, y; |
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cg = diffp * 255.f; |
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x = av_clip(w * diff, 0, w - 2) + 1; |
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y = av_clip(h * diffp, 0, h - 2) + 1; |
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draw_dot(outpicref->data[0] + outpicref->linesize[0] * y + x, outpicref->linesize[0], cg); |
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draw_dot(outpicref->data[1] + outpicref->linesize[1] * y + x, outpicref->linesize[1], cb); |
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draw_dot(outpicref->data[2] + outpicref->linesize[2] * y + x, outpicref->linesize[2], cr); |
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} |
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outpicref->pts = av_rescale_q(insamples->pts, inlink->time_base, outlink->time_base); |
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return ff_filter_frame(outlink, outpicref); |
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} |
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static int spatial_activate(AVFilterContext *ctx) |
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{ |
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AVFilterLink *inlink = ctx->inputs[0]; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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ShowSpatialContext *s = ctx->priv; |
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int ret; |
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FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); |
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if (av_audio_fifo_size(s->fifo) < s->win_size) { |
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AVFrame *frame = NULL; |
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ret = ff_inlink_consume_frame(inlink, &frame); |
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if (ret < 0) |
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return ret; |
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if (ret > 0) { |
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s->pts = frame->pts; |
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s->consumed = 0; |
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av_audio_fifo_write(s->fifo, (void **)frame->extended_data, frame->nb_samples); |
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av_frame_free(&frame); |
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} |
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} |
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if (av_audio_fifo_size(s->fifo) >= s->win_size) { |
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AVFrame *fin = ff_get_audio_buffer(inlink, s->win_size); |
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if (!fin) |
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return AVERROR(ENOMEM); |
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fin->pts = s->pts + s->consumed; |
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s->consumed += s->hop_size; |
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|
|
ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, |
313 |
|
|
FFMIN(s->win_size, av_audio_fifo_size(s->fifo))); |
314 |
|
|
if (ret < 0) { |
315 |
|
|
av_frame_free(&fin); |
316 |
|
|
return ret; |
317 |
|
|
} |
318 |
|
|
|
319 |
|
|
av_assert0(fin->nb_samples == s->win_size); |
320 |
|
|
|
321 |
|
|
ctx->internal->execute(ctx, run_channel_fft, fin, NULL, 2); |
322 |
|
|
|
323 |
|
|
ret = draw_spatial(inlink, fin); |
324 |
|
|
|
325 |
|
|
av_frame_free(&fin); |
326 |
|
|
av_audio_fifo_drain(s->fifo, s->hop_size); |
327 |
|
|
if (ret <= 0) |
328 |
|
|
return ret; |
329 |
|
|
} |
330 |
|
|
|
331 |
|
|
FF_FILTER_FORWARD_STATUS(inlink, outlink); |
332 |
|
|
if (ff_outlink_frame_wanted(outlink) && av_audio_fifo_size(s->fifo) < s->win_size) { |
333 |
|
|
ff_inlink_request_frame(inlink); |
334 |
|
|
return 0; |
335 |
|
|
} |
336 |
|
|
|
337 |
|
|
if (av_audio_fifo_size(s->fifo) >= s->win_size) { |
338 |
|
|
ff_filter_set_ready(ctx, 10); |
339 |
|
|
return 0; |
340 |
|
|
} |
341 |
|
|
return FFERROR_NOT_READY; |
342 |
|
|
} |
343 |
|
|
|
344 |
|
|
static const AVFilterPad showspatial_inputs[] = { |
345 |
|
|
{ |
346 |
|
|
.name = "default", |
347 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
348 |
|
|
}, |
349 |
|
|
{ NULL } |
350 |
|
|
}; |
351 |
|
|
|
352 |
|
|
static const AVFilterPad showspatial_outputs[] = { |
353 |
|
|
{ |
354 |
|
|
.name = "default", |
355 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
356 |
|
|
.config_props = config_output, |
357 |
|
|
}, |
358 |
|
|
{ NULL } |
359 |
|
|
}; |
360 |
|
|
|
361 |
|
|
AVFilter ff_avf_showspatial = { |
362 |
|
|
.name = "showspatial", |
363 |
|
|
.description = NULL_IF_CONFIG_SMALL("Convert input audio to a spatial video output."), |
364 |
|
|
.uninit = uninit, |
365 |
|
|
.query_formats = query_formats, |
366 |
|
|
.priv_size = sizeof(ShowSpatialContext), |
367 |
|
|
.inputs = showspatial_inputs, |
368 |
|
|
.outputs = showspatial_outputs, |
369 |
|
|
.activate = spatial_activate, |
370 |
|
|
.priv_class = &showspatial_class, |
371 |
|
|
.flags = AVFILTER_FLAG_SLICE_THREADS, |
372 |
|
|
}; |