GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/avf_showfreqs.c Lines: 0 275 0.0 %
Date: 2021-04-22 14:24:15 Branches: 0 149 0.0 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2015 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/avstring.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.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 "filters.h"
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#include "video.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "window_func.h"
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enum DataMode       { MAGNITUDE, PHASE, DELAY, NB_DATA };
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enum DisplayMode    { LINE, BAR, DOT, NB_MODES };
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enum ChannelMode    { COMBINED, SEPARATE, NB_CMODES };
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enum FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES };
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enum AmplitudeScale { AS_LINEAR, AS_SQRT, AS_CBRT, AS_LOG, NB_ASCALES };
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45
typedef struct ShowFreqsContext {
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    const AVClass *class;
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    int w, h;
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    int mode;
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    int data_mode;
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    int cmode;
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    int fft_size;
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    int fft_bits;
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    int ascale, fscale;
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    int avg;
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    int win_func;
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    FFTContext *fft;
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    FFTComplex **fft_data;
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    float **avg_data;
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    float *window_func_lut;
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    float overlap;
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    float minamp;
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    int hop_size;
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    int nb_channels;
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    int nb_freq;
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    int win_size;
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    float scale;
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    char *colors;
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    AVAudioFifo *fifo;
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    int64_t pts;
70
} ShowFreqsContext;
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#define OFFSET(x) offsetof(ShowFreqsContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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75
static const AVOption showfreqs_options[] = {
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    { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
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    { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS },
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    { "mode", "set display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=BAR}, 0, NB_MODES-1, FLAGS, "mode" },
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        { "line", "show lines",  0, AV_OPT_TYPE_CONST, {.i64=LINE},   0, 0, FLAGS, "mode" },
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        { "bar",  "show bars",   0, AV_OPT_TYPE_CONST, {.i64=BAR},    0, 0, FLAGS, "mode" },
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        { "dot",  "show dots",   0, AV_OPT_TYPE_CONST, {.i64=DOT},    0, 0, FLAGS, "mode" },
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    { "ascale", "set amplitude scale", OFFSET(ascale), AV_OPT_TYPE_INT, {.i64=AS_LOG}, 0, NB_ASCALES-1, FLAGS, "ascale" },
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        { "lin",  "linear",      0, AV_OPT_TYPE_CONST, {.i64=AS_LINEAR}, 0, 0, FLAGS, "ascale" },
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        { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=AS_SQRT},   0, 0, FLAGS, "ascale" },
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        { "cbrt", "cubic root",  0, AV_OPT_TYPE_CONST, {.i64=AS_CBRT},   0, 0, FLAGS, "ascale" },
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        { "log",  "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=AS_LOG},    0, 0, FLAGS, "ascale" },
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    { "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=FS_LINEAR}, 0, NB_FSCALES-1, FLAGS, "fscale" },
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        { "lin",  "linear",              0, AV_OPT_TYPE_CONST, {.i64=FS_LINEAR}, 0, 0, FLAGS, "fscale" },
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        { "log",  "logarithmic",         0, AV_OPT_TYPE_CONST, {.i64=FS_LOG},    0, 0, FLAGS, "fscale" },
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        { "rlog", "reverse logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_RLOG},   0, 0, FLAGS, "fscale" },
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    { "win_size", "set window size", OFFSET(fft_size), AV_OPT_TYPE_INT, {.i64=2048}, 16, 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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        { "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" },
102
        { "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" },
110
        { "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=1.}, 0., 1., FLAGS },
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    { "averaging", "set time averaging", OFFSET(avg), AV_OPT_TYPE_INT, {.i64=1}, 0, INT32_MAX, FLAGS },
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    { "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS },
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    { "cmode", "set channel mode", OFFSET(cmode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_CMODES-1, FLAGS, "cmode" },
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        { "combined", "show all channels in same window",  0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "cmode" },
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        { "separate", "show each channel in own window",   0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "cmode" },
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    { "minamp",  "set minimum amplitude", OFFSET(minamp), AV_OPT_TYPE_FLOAT, {.dbl=1e-6}, FLT_MIN, 1e-6, FLAGS },
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    { "data", "set data mode", OFFSET(data_mode), AV_OPT_TYPE_INT, {.i64=MAGNITUDE}, 0, NB_DATA-1, FLAGS, "data" },
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        { "magnitude", "show magnitude",  0, AV_OPT_TYPE_CONST, {.i64=MAGNITUDE}, 0, 0, FLAGS, "data" },
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        { "phase",     "show phase",      0, AV_OPT_TYPE_CONST, {.i64=PHASE},     0, 0, FLAGS, "data" },
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        { "delay",     "show group delay",0, AV_OPT_TYPE_CONST, {.i64=DELAY},     0, 0, FLAGS, "data" },
124
    { NULL }
125
};
126
127
AVFILTER_DEFINE_CLASS(showfreqs);
128
129
static int query_formats(AVFilterContext *ctx)
130
{
131
    AVFilterFormats *formats = NULL;
132
    AVFilterChannelLayouts *layouts = NULL;
133
    AVFilterLink *inlink = ctx->inputs[0];
134
    AVFilterLink *outlink = ctx->outputs[0];
135
    static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE };
136
    static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE };
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    int ret;
138
139
    /* set input audio formats */
140
    formats = ff_make_format_list(sample_fmts);
141
    if ((ret = ff_formats_ref(formats, &inlink->outcfg.formats)) < 0)
142
        return ret;
143
144
    layouts = ff_all_channel_layouts();
145
    if ((ret = ff_channel_layouts_ref(layouts, &inlink->outcfg.channel_layouts)) < 0)
146
        return ret;
147
148
    formats = ff_all_samplerates();
149
    if ((ret = ff_formats_ref(formats, &inlink->outcfg.samplerates)) < 0)
150
        return ret;
151
152
    /* set output video format */
153
    formats = ff_make_format_list(pix_fmts);
154
    if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
155
        return ret;
156
157
    return 0;
158
}
159
160
static av_cold int init(AVFilterContext *ctx)
161
{
162
    ShowFreqsContext *s = ctx->priv;
163
164
    s->pts = AV_NOPTS_VALUE;
165
166
    return 0;
167
}
168
169
static int config_output(AVFilterLink *outlink)
170
{
171
    AVFilterContext *ctx = outlink->src;
172
    AVFilterLink *inlink = ctx->inputs[0];
173
    ShowFreqsContext *s = ctx->priv;
174
    float overlap;
175
    int i;
176
177
    s->fft_bits = av_log2(s->fft_size);
178
    s->nb_freq = 1 << (s->fft_bits - 1);
179
    s->win_size = s->nb_freq << 1;
180
    av_audio_fifo_free(s->fifo);
181
    av_fft_end(s->fft);
182
    s->fft = av_fft_init(s->fft_bits, 0);
183
    if (!s->fft) {
184
        av_log(ctx, AV_LOG_ERROR, "Unable to create FFT context. "
185
               "The window size might be too high.\n");
186
        return AVERROR(ENOMEM);
187
    }
188
189
    /* FFT buffers: x2 for each (display) channel buffer.
190
     * Note: we use free and malloc instead of a realloc-like function to
191
     * make sure the buffer is aligned in memory for the FFT functions. */
192
    for (i = 0; i < s->nb_channels; i++) {
193
        av_freep(&s->fft_data[i]);
194
        av_freep(&s->avg_data[i]);
195
    }
196
    av_freep(&s->fft_data);
197
    av_freep(&s->avg_data);
198
    s->nb_channels = inlink->channels;
199
200
    s->fft_data = av_calloc(s->nb_channels, sizeof(*s->fft_data));
201
    if (!s->fft_data)
202
        return AVERROR(ENOMEM);
203
    s->avg_data = av_calloc(s->nb_channels, sizeof(*s->avg_data));
204
    if (!s->avg_data)
205
        return AVERROR(ENOMEM);
206
    for (i = 0; i < s->nb_channels; i++) {
207
        s->fft_data[i] = av_calloc(s->win_size, sizeof(**s->fft_data));
208
        s->avg_data[i] = av_calloc(s->nb_freq, sizeof(**s->avg_data));
209
        if (!s->fft_data[i] || !s->avg_data[i])
210
            return AVERROR(ENOMEM);
211
    }
212
213
    /* pre-calc windowing function */
214
    s->window_func_lut = av_realloc_f(s->window_func_lut, s->win_size,
215
                                      sizeof(*s->window_func_lut));
216
    if (!s->window_func_lut)
217
        return AVERROR(ENOMEM);
218
    generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);
219
    if (s->overlap == 1.)
220
        s->overlap = overlap;
221
    s->hop_size = (1. - s->overlap) * s->win_size;
222
    if (s->hop_size < 1) {
223
        av_log(ctx, AV_LOG_ERROR, "overlap %f too big\n", s->overlap);
224
        return AVERROR(EINVAL);
225
    }
226
227
    for (s->scale = 0, i = 0; i < s->win_size; i++) {
228
        s->scale += s->window_func_lut[i] * s->window_func_lut[i];
229
    }
230
231
    outlink->frame_rate = av_make_q(inlink->sample_rate, s->win_size * (1.-s->overlap));
232
    outlink->sample_aspect_ratio = (AVRational){1,1};
233
    outlink->w = s->w;
234
    outlink->h = s->h;
235
236
    s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->win_size);
237
    if (!s->fifo)
238
        return AVERROR(ENOMEM);
239
    return 0;
240
}
241
242
static inline void draw_dot(AVFrame *out, int x, int y, uint8_t fg[4])
243
{
244
245
    uint32_t color = AV_RL32(out->data[0] + y * out->linesize[0] + x * 4);
246
247
    if ((color & 0xffffff) != 0)
248
        AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg) | color);
249
    else
250
        AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg));
251
}
252
253
static int get_sx(ShowFreqsContext *s, int f)
254
{
255
    switch (s->fscale) {
256
    case FS_LINEAR:
257
        return (s->w/(float)s->nb_freq)*f;
258
    case FS_LOG:
259
        return s->w-pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.));
260
    case FS_RLOG:
261
        return pow(s->w, f/(s->nb_freq-1.));
262
    }
263
264
    return 0;
265
}
266
267
static float get_bsize(ShowFreqsContext *s, int f)
268
{
269
    switch (s->fscale) {
270
    case FS_LINEAR:
271
        return s->w/(float)s->nb_freq;
272
    case FS_LOG:
273
        return pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.))-
274
               pow(s->w, (s->nb_freq-f-2)/(s->nb_freq-1.));
275
    case FS_RLOG:
276
        return pow(s->w, (f+1)/(s->nb_freq-1.))-
277
               pow(s->w,  f   /(s->nb_freq-1.));
278
    }
279
280
    return 1.;
281
}
282
283
static inline void plot_freq(ShowFreqsContext *s, int ch,
284
                             double a, int f, uint8_t fg[4], int *prev_y,
285
                             AVFrame *out, AVFilterLink *outlink)
286
{
287
    const int w = s->w;
288
    const float min = s->minamp;
289
    const float avg = s->avg_data[ch][f];
290
    const float bsize = get_bsize(s, f);
291
    const int sx = get_sx(s, f);
292
    int end = outlink->h;
293
    int x, y, i;
294
295
    switch(s->ascale) {
296
    case AS_SQRT:
297
        a = 1.0 - sqrt(a);
298
        break;
299
    case AS_CBRT:
300
        a = 1.0 - cbrt(a);
301
        break;
302
    case AS_LOG:
303
        a = log(av_clipd(a, min, 1)) / log(min);
304
        break;
305
    case AS_LINEAR:
306
        a = 1.0 - a;
307
        break;
308
    }
309
310
    switch (s->cmode) {
311
    case COMBINED:
312
        y = a * outlink->h - 1;
313
        break;
314
    case SEPARATE:
315
        end = (outlink->h / s->nb_channels) * (ch + 1);
316
        y = (outlink->h / s->nb_channels) * ch + a * (outlink->h / s->nb_channels) - 1;
317
        break;
318
    default:
319
        av_assert0(0);
320
    }
321
    if (y < 0)
322
        return;
323
324
    switch (s->avg) {
325
    case 0:
326
        y = s->avg_data[ch][f] = !outlink->frame_count_in ? y : FFMIN(avg, y);
327
        break;
328
    case 1:
329
        break;
330
    default:
331
        s->avg_data[ch][f] = avg + y * (y - avg) / (FFMIN(outlink->frame_count_in + 1, s->avg) * y);
332
        y = s->avg_data[ch][f];
333
        break;
334
    }
335
336
    switch(s->mode) {
337
    case LINE:
338
        if (*prev_y == -1) {
339
            *prev_y = y;
340
        }
341
        if (y <= *prev_y) {
342
            for (x = sx + 1; x < sx + bsize && x < w; x++)
343
                draw_dot(out, x, y, fg);
344
            for (i = y; i <= *prev_y; i++)
345
                draw_dot(out, sx, i, fg);
346
        } else {
347
            for (i = *prev_y; i <= y; i++)
348
                draw_dot(out, sx, i, fg);
349
            for (x = sx + 1; x < sx + bsize && x < w; x++)
350
                draw_dot(out, x, i - 1, fg);
351
        }
352
        *prev_y = y;
353
        break;
354
    case BAR:
355
        for (x = sx; x < sx + bsize && x < w; x++)
356
            for (i = y; i < end; i++)
357
                draw_dot(out, x, i, fg);
358
        break;
359
    case DOT:
360
        for (x = sx; x < sx + bsize && x < w; x++)
361
            draw_dot(out, x, y, fg);
362
        break;
363
    }
364
}
365
366
static int plot_freqs(AVFilterLink *inlink, AVFrame *in)
367
{
368
    AVFilterContext *ctx = inlink->dst;
369
    AVFilterLink *outlink = ctx->outputs[0];
370
    ShowFreqsContext *s = ctx->priv;
371
    const int win_size = s->win_size;
372
    char *colors, *color, *saveptr = NULL;
373
    AVFrame *out;
374
    int ch, n;
375
376
    out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
377
    if (!out)
378
        return AVERROR(ENOMEM);
379
380
    for (n = 0; n < outlink->h; n++)
381
        memset(out->data[0] + out->linesize[0] * n, 0, outlink->w * 4);
382
383
    /* fill FFT input with the number of samples available */
384
    for (ch = 0; ch < s->nb_channels; ch++) {
385
        const float *p = (float *)in->extended_data[ch];
386
387
        for (n = 0; n < in->nb_samples; n++) {
388
            s->fft_data[ch][n].re = p[n] * s->window_func_lut[n];
389
            s->fft_data[ch][n].im = 0;
390
        }
391
        for (; n < win_size; n++) {
392
            s->fft_data[ch][n].re = 0;
393
            s->fft_data[ch][n].im = 0;
394
        }
395
    }
396
397
    /* run FFT on each samples set */
398
    for (ch = 0; ch < s->nb_channels; ch++) {
399
        av_fft_permute(s->fft, s->fft_data[ch]);
400
        av_fft_calc(s->fft, s->fft_data[ch]);
401
    }
402
403
#define RE(x, ch) s->fft_data[ch][x].re
404
#define IM(x, ch) s->fft_data[ch][x].im
405
#define M(a, b) (sqrt((a) * (a) + (b) * (b)))
406
#define P(a, b) (atan2((b), (a)))
407
408
    colors = av_strdup(s->colors);
409
    if (!colors) {
410
        av_frame_free(&out);
411
        return AVERROR(ENOMEM);
412
    }
413
414
    for (ch = 0; ch < s->nb_channels; ch++) {
415
        uint8_t fg[4] = { 0xff, 0xff, 0xff, 0xff };
416
        int prev_y = -1, f;
417
        double a;
418
419
        color = av_strtok(ch == 0 ? colors : NULL, " |", &saveptr);
420
        if (color)
421
            av_parse_color(fg, color, -1, ctx);
422
423
        switch (s->data_mode) {
424
        case MAGNITUDE:
425
            a = av_clipd(M(RE(0, ch), 0) / s->scale, 0, 1);
426
            plot_freq(s, ch, a, 0, fg, &prev_y, out, outlink);
427
428
            for (f = 1; f < s->nb_freq; f++) {
429
                a = av_clipd(M(RE(f, ch), IM(f, ch)) / s->scale, 0, 1);
430
431
                plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
432
            }
433
            break;
434
        case PHASE:
435
            a = av_clipd((M_PI + P(RE(0, ch), 0)) / (2. * M_PI), 0, 1);
436
            plot_freq(s, ch, a, 0, fg, &prev_y, out, outlink);
437
438
            for (f = 1; f < s->nb_freq; f++) {
439
                a = av_clipd((M_PI + P(RE(f, ch), IM(f, ch))) / (2. * M_PI), 0, 1);
440
441
                plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
442
            }
443
            break;
444
        case DELAY:
445
            plot_freq(s, ch, 0, 0, fg, &prev_y, out, outlink);
446
447
            for (f = 1; f < s->nb_freq; f++) {
448
                a = av_clipd((M_PI - P(IM(f, ch) * RE(f-1, ch) - IM(f-1, ch) * RE(f, ch),
449
                                       RE(f, ch) * RE(f-1, ch) + IM(f, ch) * IM(f-1, ch))) / (2. * M_PI), 0, 1);
450
451
                plot_freq(s, ch, a, f, fg, &prev_y, out, outlink);
452
            }
453
            break;
454
        }
455
    }
456
457
    av_free(colors);
458
    out->pts = in->pts;
459
    out->sample_aspect_ratio = (AVRational){1,1};
460
    return ff_filter_frame(outlink, out);
461
}
462
463
static int filter_frame(AVFilterLink *inlink)
464
{
465
    AVFilterContext *ctx = inlink->dst;
466
    ShowFreqsContext *s = ctx->priv;
467
    AVFrame *fin = NULL;
468
    int ret = 0;
469
470
    fin = ff_get_audio_buffer(inlink, s->win_size);
471
    if (!fin) {
472
        ret = AVERROR(ENOMEM);
473
        goto fail;
474
    }
475
476
    fin->pts = s->pts;
477
    s->pts += s->hop_size;
478
    ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);
479
    if (ret < 0)
480
        goto fail;
481
482
    ret = plot_freqs(inlink, fin);
483
    av_frame_free(&fin);
484
    av_audio_fifo_drain(s->fifo, s->hop_size);
485
486
fail:
487
    av_frame_free(&fin);
488
    return ret;
489
}
490
491
static int activate(AVFilterContext *ctx)
492
{
493
    AVFilterLink *inlink = ctx->inputs[0];
494
    AVFilterLink *outlink = ctx->outputs[0];
495
    ShowFreqsContext *s = ctx->priv;
496
    AVFrame *in = NULL;
497
    int ret = 0;
498
499
    FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
500
501
    if (av_audio_fifo_size(s->fifo) < s->win_size)
502
        ret = ff_inlink_consume_samples(inlink, s->win_size, s->win_size, &in);
503
    if (ret < 0)
504
        return ret;
505
    if (ret > 0) {
506
        av_audio_fifo_write(s->fifo, (void **)in->extended_data, in->nb_samples);
507
        if (s->pts == AV_NOPTS_VALUE)
508
            s->pts = in->pts;
509
        av_frame_free(&in);
510
    }
511
512
    if (av_audio_fifo_size(s->fifo) >= s->win_size) {
513
        ret = filter_frame(inlink);
514
        if (ret <= 0)
515
            return ret;
516
    }
517
518
    FF_FILTER_FORWARD_STATUS(inlink, outlink);
519
    FF_FILTER_FORWARD_WANTED(outlink, inlink);
520
521
    return FFERROR_NOT_READY;
522
}
523
524
static av_cold void uninit(AVFilterContext *ctx)
525
{
526
    ShowFreqsContext *s = ctx->priv;
527
    int i;
528
529
    av_fft_end(s->fft);
530
    for (i = 0; i < s->nb_channels; i++) {
531
        if (s->fft_data)
532
            av_freep(&s->fft_data[i]);
533
        if (s->avg_data)
534
            av_freep(&s->avg_data[i]);
535
    }
536
    av_freep(&s->fft_data);
537
    av_freep(&s->avg_data);
538
    av_freep(&s->window_func_lut);
539
    av_audio_fifo_free(s->fifo);
540
}
541
542
static const AVFilterPad showfreqs_inputs[] = {
543
    {
544
        .name         = "default",
545
        .type         = AVMEDIA_TYPE_AUDIO,
546
    },
547
    { NULL }
548
};
549
550
static const AVFilterPad showfreqs_outputs[] = {
551
    {
552
        .name          = "default",
553
        .type          = AVMEDIA_TYPE_VIDEO,
554
        .config_props  = config_output,
555
    },
556
    { NULL }
557
};
558
559
AVFilter ff_avf_showfreqs = {
560
    .name          = "showfreqs",
561
    .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a frequencies video output."),
562
    .init          = init,
563
    .uninit        = uninit,
564
    .query_formats = query_formats,
565
    .priv_size     = sizeof(ShowFreqsContext),
566
    .activate      = activate,
567
    .inputs        = showfreqs_inputs,
568
    .outputs       = showfreqs_outputs,
569
    .priv_class    = &showfreqs_class,
570
};