mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
350 lines
11 KiB
C
350 lines
11 KiB
C
/*
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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_OPTION("win_func", OFFSET(win_func), FLAGS, WFUNC_HANNING),
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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->outcfg.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->outcfg.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->outcfg.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->incfg.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,
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FFMIN(s->win_size, av_audio_fifo_size(s->fifo)));
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if (ret < 0) {
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av_frame_free(&fin);
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return ret;
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}
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av_assert0(fin->nb_samples == s->win_size);
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ff_filter_execute(ctx, run_channel_fft, fin, NULL, 2);
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ret = draw_spatial(inlink, fin);
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av_frame_free(&fin);
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av_audio_fifo_drain(s->fifo, s->hop_size);
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if (ret <= 0)
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return ret;
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}
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FF_FILTER_FORWARD_STATUS(inlink, outlink);
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if (ff_outlink_frame_wanted(outlink) && av_audio_fifo_size(s->fifo) < s->win_size) {
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ff_inlink_request_frame(inlink);
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return 0;
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}
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if (av_audio_fifo_size(s->fifo) >= s->win_size) {
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ff_filter_set_ready(ctx, 10);
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return 0;
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}
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return FFERROR_NOT_READY;
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}
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static const AVFilterPad showspatial_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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},
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};
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static const AVFilterPad showspatial_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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},
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};
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const AVFilter ff_avf_showspatial = {
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.name = "showspatial",
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.description = NULL_IF_CONFIG_SMALL("Convert input audio to a spatial video output."),
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.uninit = uninit,
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.priv_size = sizeof(ShowSpatialContext),
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FILTER_INPUTS(showspatial_inputs),
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FILTER_OUTPUTS(showspatial_outputs),
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FILTER_QUERY_FUNC(query_formats),
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.activate = spatial_activate,
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.priv_class = &showspatial_class,
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.flags = AVFILTER_FLAG_SLICE_THREADS,
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};
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