| /* |
| * Copyright (c) 2015 Paul B Mahol |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <float.h> |
| #include <math.h> |
| |
| #include "libavcodec/avfft.h" |
| #include "libavutil/audio_fifo.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/parseutils.h" |
| #include "audio.h" |
| #include "filters.h" |
| #include "video.h" |
| #include "avfilter.h" |
| #include "internal.h" |
| #include "window_func.h" |
| |
| enum DataMode { MAGNITUDE, PHASE, DELAY, NB_DATA }; |
| enum DisplayMode { LINE, BAR, DOT, NB_MODES }; |
| enum ChannelMode { COMBINED, SEPARATE, NB_CMODES }; |
| enum FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES }; |
| enum AmplitudeScale { AS_LINEAR, AS_SQRT, AS_CBRT, AS_LOG, NB_ASCALES }; |
| |
| typedef struct ShowFreqsContext { |
| const AVClass *class; |
| int w, h; |
| int mode; |
| int data_mode; |
| int cmode; |
| int fft_size; |
| int fft_bits; |
| int ascale, fscale; |
| int avg; |
| int win_func; |
| FFTContext *fft; |
| FFTComplex **fft_data; |
| float **avg_data; |
| float *window_func_lut; |
| float overlap; |
| float minamp; |
| int hop_size; |
| int nb_channels; |
| int nb_freq; |
| int win_size; |
| float scale; |
| char *colors; |
| AVAudioFifo *fifo; |
| int64_t pts; |
| } ShowFreqsContext; |
| |
| #define OFFSET(x) offsetof(ShowFreqsContext, x) |
| #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| |
| static const AVOption showfreqs_options[] = { |
| { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS }, |
| { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "1024x512"}, 0, 0, FLAGS }, |
| { "mode", "set display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=BAR}, 0, NB_MODES-1, FLAGS, "mode" }, |
| { "line", "show lines", 0, AV_OPT_TYPE_CONST, {.i64=LINE}, 0, 0, FLAGS, "mode" }, |
| { "bar", "show bars", 0, AV_OPT_TYPE_CONST, {.i64=BAR}, 0, 0, FLAGS, "mode" }, |
| { "dot", "show dots", 0, AV_OPT_TYPE_CONST, {.i64=DOT}, 0, 0, FLAGS, "mode" }, |
| { "ascale", "set amplitude scale", OFFSET(ascale), AV_OPT_TYPE_INT, {.i64=AS_LOG}, 0, NB_ASCALES-1, FLAGS, "ascale" }, |
| { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=AS_LINEAR}, 0, 0, FLAGS, "ascale" }, |
| { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=AS_SQRT}, 0, 0, FLAGS, "ascale" }, |
| { "cbrt", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64=AS_CBRT}, 0, 0, FLAGS, "ascale" }, |
| { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=AS_LOG}, 0, 0, FLAGS, "ascale" }, |
| { "fscale", "set frequency scale", OFFSET(fscale), AV_OPT_TYPE_INT, {.i64=FS_LINEAR}, 0, NB_FSCALES-1, FLAGS, "fscale" }, |
| { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=FS_LINEAR}, 0, 0, FLAGS, "fscale" }, |
| { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_LOG}, 0, 0, FLAGS, "fscale" }, |
| { "rlog", "reverse logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=FS_RLOG}, 0, 0, FLAGS, "fscale" }, |
| { "win_size", "set window size", OFFSET(fft_size), AV_OPT_TYPE_INT, {.i64=2048}, 16, 65536, FLAGS }, |
| { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64=WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" }, |
| { "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" }, |
| { "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" }, |
| { "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" }, |
| { "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" }, |
| { "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" }, |
| { "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" }, |
| { "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" }, |
| { "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" }, |
| { "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" }, |
| { "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" }, |
| { "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" }, |
| { "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" }, |
| { "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, FLAGS, "win_func" }, |
| { "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, FLAGS, "win_func" }, |
| { "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" }, |
| { "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" }, |
| { "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, FLAGS, "win_func" }, |
| { "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, FLAGS, "win_func" }, |
| { "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, FLAGS, "win_func" }, |
| { "bohman", "Bohman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BOHMAN} , 0, 0, FLAGS, "win_func" }, |
| { "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=1.}, 0., 1., FLAGS }, |
| { "averaging", "set time averaging", OFFSET(avg), AV_OPT_TYPE_INT, {.i64=1}, 0, INT32_MAX, FLAGS }, |
| { "colors", "set channels colors", OFFSET(colors), AV_OPT_TYPE_STRING, {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, FLAGS }, |
| { "cmode", "set channel mode", OFFSET(cmode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_CMODES-1, FLAGS, "cmode" }, |
| { "combined", "show all channels in same window", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "cmode" }, |
| { "separate", "show each channel in own window", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "cmode" }, |
| { "minamp", "set minimum amplitude", OFFSET(minamp), AV_OPT_TYPE_FLOAT, {.dbl=1e-6}, FLT_MIN, 1e-6, FLAGS }, |
| { "data", "set data mode", OFFSET(data_mode), AV_OPT_TYPE_INT, {.i64=MAGNITUDE}, 0, NB_DATA-1, FLAGS, "data" }, |
| { "magnitude", "show magnitude", 0, AV_OPT_TYPE_CONST, {.i64=MAGNITUDE}, 0, 0, FLAGS, "data" }, |
| { "phase", "show phase", 0, AV_OPT_TYPE_CONST, {.i64=PHASE}, 0, 0, FLAGS, "data" }, |
| { "delay", "show group delay",0, AV_OPT_TYPE_CONST, {.i64=DELAY}, 0, 0, FLAGS, "data" }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(showfreqs); |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats = NULL; |
| AVFilterChannelLayouts *layouts = NULL; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE }; |
| static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGBA, AV_PIX_FMT_NONE }; |
| int ret; |
| |
| /* set input audio formats */ |
| formats = ff_make_format_list(sample_fmts); |
| if ((ret = ff_formats_ref(formats, &inlink->outcfg.formats)) < 0) |
| return ret; |
| |
| layouts = ff_all_channel_layouts(); |
| if ((ret = ff_channel_layouts_ref(layouts, &inlink->outcfg.channel_layouts)) < 0) |
| return ret; |
| |
| formats = ff_all_samplerates(); |
| if ((ret = ff_formats_ref(formats, &inlink->outcfg.samplerates)) < 0) |
| return ret; |
| |
| /* set output video format */ |
| formats = ff_make_format_list(pix_fmts); |
| if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0) |
| return ret; |
| |
| return 0; |
| } |
| |
| static av_cold int init(AVFilterContext *ctx) |
| { |
| ShowFreqsContext *s = ctx->priv; |
| |
| s->pts = AV_NOPTS_VALUE; |
| |
| return 0; |
| } |
| |
| static int config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| ShowFreqsContext *s = ctx->priv; |
| float overlap; |
| int i; |
| |
| s->fft_bits = av_log2(s->fft_size); |
| s->nb_freq = 1 << (s->fft_bits - 1); |
| s->win_size = s->nb_freq << 1; |
| av_audio_fifo_free(s->fifo); |
| av_fft_end(s->fft); |
| s->fft = av_fft_init(s->fft_bits, 0); |
| if (!s->fft) { |
| av_log(ctx, AV_LOG_ERROR, "Unable to create FFT context. " |
| "The window size might be too high.\n"); |
| return AVERROR(ENOMEM); |
| } |
| |
| /* FFT buffers: x2 for each (display) channel buffer. |
| * Note: we use free and malloc instead of a realloc-like function to |
| * make sure the buffer is aligned in memory for the FFT functions. */ |
| for (i = 0; i < s->nb_channels; i++) { |
| av_freep(&s->fft_data[i]); |
| av_freep(&s->avg_data[i]); |
| } |
| av_freep(&s->fft_data); |
| av_freep(&s->avg_data); |
| s->nb_channels = inlink->channels; |
| |
| s->fft_data = av_calloc(s->nb_channels, sizeof(*s->fft_data)); |
| if (!s->fft_data) |
| return AVERROR(ENOMEM); |
| s->avg_data = av_calloc(s->nb_channels, sizeof(*s->avg_data)); |
| if (!s->avg_data) |
| return AVERROR(ENOMEM); |
| for (i = 0; i < s->nb_channels; i++) { |
| s->fft_data[i] = av_calloc(s->win_size, sizeof(**s->fft_data)); |
| s->avg_data[i] = av_calloc(s->nb_freq, sizeof(**s->avg_data)); |
| if (!s->fft_data[i] || !s->avg_data[i]) |
| return AVERROR(ENOMEM); |
| } |
| |
| /* pre-calc windowing function */ |
| s->window_func_lut = av_realloc_f(s->window_func_lut, s->win_size, |
| sizeof(*s->window_func_lut)); |
| if (!s->window_func_lut) |
| return AVERROR(ENOMEM); |
| generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap); |
| if (s->overlap == 1.) |
| s->overlap = overlap; |
| s->hop_size = (1. - s->overlap) * s->win_size; |
| if (s->hop_size < 1) { |
| av_log(ctx, AV_LOG_ERROR, "overlap %f too big\n", s->overlap); |
| return AVERROR(EINVAL); |
| } |
| |
| for (s->scale = 0, i = 0; i < s->win_size; i++) { |
| s->scale += s->window_func_lut[i] * s->window_func_lut[i]; |
| } |
| |
| outlink->frame_rate = av_make_q(inlink->sample_rate, s->win_size * (1.-s->overlap)); |
| outlink->sample_aspect_ratio = (AVRational){1,1}; |
| outlink->w = s->w; |
| outlink->h = s->h; |
| |
| s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->win_size); |
| if (!s->fifo) |
| return AVERROR(ENOMEM); |
| return 0; |
| } |
| |
| static inline void draw_dot(AVFrame *out, int x, int y, uint8_t fg[4]) |
| { |
| |
| uint32_t color = AV_RL32(out->data[0] + y * out->linesize[0] + x * 4); |
| |
| if ((color & 0xffffff) != 0) |
| AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg) | color); |
| else |
| AV_WL32(out->data[0] + y * out->linesize[0] + x * 4, AV_RL32(fg)); |
| } |
| |
| static int get_sx(ShowFreqsContext *s, int f) |
| { |
| switch (s->fscale) { |
| case FS_LINEAR: |
| return (s->w/(float)s->nb_freq)*f; |
| case FS_LOG: |
| return s->w-pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.)); |
| case FS_RLOG: |
| return pow(s->w, f/(s->nb_freq-1.)); |
| } |
| |
| return 0; |
| } |
| |
| static float get_bsize(ShowFreqsContext *s, int f) |
| { |
| switch (s->fscale) { |
| case FS_LINEAR: |
| return s->w/(float)s->nb_freq; |
| case FS_LOG: |
| return pow(s->w, (s->nb_freq-f-1)/(s->nb_freq-1.))- |
| pow(s->w, (s->nb_freq-f-2)/(s->nb_freq-1.)); |
| case FS_RLOG: |
| return pow(s->w, (f+1)/(s->nb_freq-1.))- |
| pow(s->w, f /(s->nb_freq-1.)); |
| } |
| |
| return 1.; |
| } |
| |
| static inline void plot_freq(ShowFreqsContext *s, int ch, |
| double a, int f, uint8_t fg[4], int *prev_y, |
| AVFrame *out, AVFilterLink *outlink) |
| { |
| const int w = s->w; |
| const float min = s->minamp; |
| const float avg = s->avg_data[ch][f]; |
| const float bsize = get_bsize(s, f); |
| const int sx = get_sx(s, f); |
| int end = outlink->h; |
| int x, y, i; |
| |
| switch(s->ascale) { |
| case AS_SQRT: |
| a = 1.0 - sqrt(a); |
| break; |
| case AS_CBRT: |
| a = 1.0 - cbrt(a); |
| break; |
| case AS_LOG: |
| a = log(av_clipd(a, min, 1)) / log(min); |
| break; |
| case AS_LINEAR: |
| a = 1.0 - a; |
| break; |
| } |
| |
| switch (s->cmode) { |
| case COMBINED: |
| y = a * outlink->h - 1; |
| break; |
| case SEPARATE: |
| end = (outlink->h / s->nb_channels) * (ch + 1); |
| y = (outlink->h / s->nb_channels) * ch + a * (outlink->h / s->nb_channels) - 1; |
| break; |
| default: |
| av_assert0(0); |
| } |
| if (y < 0) |
| return; |
| |
| switch (s->avg) { |
| case 0: |
| y = s->avg_data[ch][f] = !outlink->frame_count_in ? y : FFMIN(avg, y); |
| break; |
| case 1: |
| break; |
| default: |
| s->avg_data[ch][f] = avg + y * (y - avg) / (FFMIN(outlink->frame_count_in + 1, s->avg) * y); |
| y = s->avg_data[ch][f]; |
| break; |
| } |
| |
| switch(s->mode) { |
| case LINE: |
| if (*prev_y == -1) { |
| *prev_y = y; |
| } |
| if (y <= *prev_y) { |
| for (x = sx + 1; x < sx + bsize && x < w; x++) |
| draw_dot(out, x, y, fg); |
| for (i = y; i <= *prev_y; i++) |
| draw_dot(out, sx, i, fg); |
| } else { |
| for (i = *prev_y; i <= y; i++) |
| draw_dot(out, sx, i, fg); |
| for (x = sx + 1; x < sx + bsize && x < w; x++) |
| draw_dot(out, x, i - 1, fg); |
| } |
| *prev_y = y; |
| break; |
| case BAR: |
| for (x = sx; x < sx + bsize && x < w; x++) |
| for (i = y; i < end; i++) |
| draw_dot(out, x, i, fg); |
| break; |
| case DOT: |
| for (x = sx; x < sx + bsize && x < w; x++) |
| draw_dot(out, x, y, fg); |
| break; |
| } |
| } |
| |
| static int plot_freqs(AVFilterLink *inlink, AVFrame *in) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| ShowFreqsContext *s = ctx->priv; |
| const int win_size = s->win_size; |
| char *colors, *color, *saveptr = NULL; |
| AVFrame *out; |
| int ch, n; |
| |
| out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| if (!out) |
| return AVERROR(ENOMEM); |
| |
| for (n = 0; n < outlink->h; n++) |
| memset(out->data[0] + out->linesize[0] * n, 0, outlink->w * 4); |
| |
| /* fill FFT input with the number of samples available */ |
| for (ch = 0; ch < s->nb_channels; ch++) { |
| const float *p = (float *)in->extended_data[ch]; |
| |
| for (n = 0; n < in->nb_samples; n++) { |
| s->fft_data[ch][n].re = p[n] * s->window_func_lut[n]; |
| s->fft_data[ch][n].im = 0; |
| } |
| for (; n < win_size; n++) { |
| s->fft_data[ch][n].re = 0; |
| s->fft_data[ch][n].im = 0; |
| } |
| } |
| |
| /* run FFT on each samples set */ |
| for (ch = 0; ch < s->nb_channels; ch++) { |
| av_fft_permute(s->fft, s->fft_data[ch]); |
| av_fft_calc(s->fft, s->fft_data[ch]); |
| } |
| |
| #define RE(x, ch) s->fft_data[ch][x].re |
| #define IM(x, ch) s->fft_data[ch][x].im |
| #define M(a, b) (sqrt((a) * (a) + (b) * (b))) |
| #define P(a, b) (atan2((b), (a))) |
| |
| colors = av_strdup(s->colors); |
| if (!colors) { |
| av_frame_free(&out); |
| return AVERROR(ENOMEM); |
| } |
| |
| for (ch = 0; ch < s->nb_channels; ch++) { |
| uint8_t fg[4] = { 0xff, 0xff, 0xff, 0xff }; |
| int prev_y = -1, f; |
| double a; |
| |
| color = av_strtok(ch == 0 ? colors : NULL, " |", &saveptr); |
| if (color) |
| av_parse_color(fg, color, -1, ctx); |
| |
| switch (s->data_mode) { |
| case MAGNITUDE: |
| a = av_clipd(M(RE(0, ch), 0) / s->scale, 0, 1); |
| plot_freq(s, ch, a, 0, fg, &prev_y, out, outlink); |
| |
| for (f = 1; f < s->nb_freq; f++) { |
| a = av_clipd(M(RE(f, ch), IM(f, ch)) / s->scale, 0, 1); |
| |
| plot_freq(s, ch, a, f, fg, &prev_y, out, outlink); |
| } |
| break; |
| case PHASE: |
| a = av_clipd((M_PI + P(RE(0, ch), 0)) / (2. * M_PI), 0, 1); |
| plot_freq(s, ch, a, 0, fg, &prev_y, out, outlink); |
| |
| for (f = 1; f < s->nb_freq; f++) { |
| a = av_clipd((M_PI + P(RE(f, ch), IM(f, ch))) / (2. * M_PI), 0, 1); |
| |
| plot_freq(s, ch, a, f, fg, &prev_y, out, outlink); |
| } |
| break; |
| case DELAY: |
| plot_freq(s, ch, 0, 0, fg, &prev_y, out, outlink); |
| |
| for (f = 1; f < s->nb_freq; f++) { |
| a = av_clipd((M_PI - P(IM(f, ch) * RE(f-1, ch) - IM(f-1, ch) * RE(f, ch), |
| RE(f, ch) * RE(f-1, ch) + IM(f, ch) * IM(f-1, ch))) / (2. * M_PI), 0, 1); |
| |
| plot_freq(s, ch, a, f, fg, &prev_y, out, outlink); |
| } |
| break; |
| } |
| } |
| |
| av_free(colors); |
| out->pts = in->pts; |
| out->sample_aspect_ratio = (AVRational){1,1}; |
| return ff_filter_frame(outlink, out); |
| } |
| |
| static int filter_frame(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| ShowFreqsContext *s = ctx->priv; |
| AVFrame *fin = NULL; |
| int ret = 0; |
| |
| fin = ff_get_audio_buffer(inlink, s->win_size); |
| if (!fin) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| |
| fin->pts = s->pts; |
| s->pts += s->hop_size; |
| ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size); |
| if (ret < 0) |
| goto fail; |
| |
| ret = plot_freqs(inlink, fin); |
| av_frame_free(&fin); |
| av_audio_fifo_drain(s->fifo, s->hop_size); |
| |
| fail: |
| av_frame_free(&fin); |
| return ret; |
| } |
| |
| static int activate(AVFilterContext *ctx) |
| { |
| AVFilterLink *inlink = ctx->inputs[0]; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| ShowFreqsContext *s = ctx->priv; |
| AVFrame *in = NULL; |
| int ret = 0; |
| |
| FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink); |
| |
| if (av_audio_fifo_size(s->fifo) < s->win_size) |
| ret = ff_inlink_consume_samples(inlink, s->win_size, s->win_size, &in); |
| if (ret < 0) |
| return ret; |
| if (ret > 0) { |
| av_audio_fifo_write(s->fifo, (void **)in->extended_data, in->nb_samples); |
| if (s->pts == AV_NOPTS_VALUE) |
| s->pts = in->pts; |
| av_frame_free(&in); |
| } |
| |
| if (av_audio_fifo_size(s->fifo) >= s->win_size) { |
| ret = filter_frame(inlink); |
| if (ret <= 0) |
| return ret; |
| } |
| |
| FF_FILTER_FORWARD_STATUS(inlink, outlink); |
| FF_FILTER_FORWARD_WANTED(outlink, inlink); |
| |
| return FFERROR_NOT_READY; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| ShowFreqsContext *s = ctx->priv; |
| int i; |
| |
| av_fft_end(s->fft); |
| for (i = 0; i < s->nb_channels; i++) { |
| if (s->fft_data) |
| av_freep(&s->fft_data[i]); |
| if (s->avg_data) |
| av_freep(&s->avg_data[i]); |
| } |
| av_freep(&s->fft_data); |
| av_freep(&s->avg_data); |
| av_freep(&s->window_func_lut); |
| av_audio_fifo_free(s->fifo); |
| } |
| |
| static const AVFilterPad showfreqs_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad showfreqs_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_output, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_avf_showfreqs = { |
| .name = "showfreqs", |
| .description = NULL_IF_CONFIG_SMALL("Convert input audio to a frequencies video output."), |
| .init = init, |
| .uninit = uninit, |
| .query_formats = query_formats, |
| .priv_size = sizeof(ShowFreqsContext), |
| .activate = activate, |
| .inputs = showfreqs_inputs, |
| .outputs = showfreqs_outputs, |
| .priv_class = &showfreqs_class, |
| }; |
