| /* |
| * Copyright (c) 2012-2013 Clément Bœsch |
| * Copyright (c) 2013 Rudolf Polzer <divverent@xonotic.org> |
| * |
| * 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 |
| */ |
| |
| /** |
| * @file |
| * audio to spectrum (video) transmedia filter, based on ffplay rdft showmode |
| * (by Michael Niedermayer) and lavfi/avf_showwaves (by Stefano Sabatini). |
| */ |
| |
| #include <math.h> |
| |
| #include "libavcodec/avfft.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/opt.h" |
| #include "avfilter.h" |
| #include "internal.h" |
| |
| enum DisplayMode { COMBINED, SEPARATE, NB_MODES }; |
| enum DisplayScale { LINEAR, SQRT, CBRT, LOG, NB_SCALES }; |
| enum ColorMode { CHANNEL, INTENSITY, NB_CLMODES }; |
| enum WindowFunc { WFUNC_NONE, WFUNC_HANN, WFUNC_HAMMING, WFUNC_BLACKMAN, NB_WFUNC }; |
| |
| typedef struct { |
| const AVClass *class; |
| int w, h; |
| AVFrame *outpicref; |
| int req_fullfilled; |
| int nb_display_channels; |
| int channel_height; |
| int sliding; ///< 1 if sliding mode, 0 otherwise |
| enum DisplayMode mode; ///< channel display mode |
| enum ColorMode color_mode; ///< display color scheme |
| enum DisplayScale scale; |
| float saturation; ///< color saturation multiplier |
| int xpos; ///< x position (current column) |
| RDFTContext *rdft; ///< Real Discrete Fourier Transform context |
| int rdft_bits; ///< number of bits (RDFT window size = 1<<rdft_bits) |
| FFTSample **rdft_data; ///< bins holder for each (displayed) channels |
| int filled; ///< number of samples (per channel) filled in current rdft_buffer |
| int consumed; ///< number of samples (per channel) consumed from the input frame |
| float *window_func_lut; ///< Window function LUT |
| enum WindowFunc win_func; |
| float *combine_buffer; ///< color combining buffer (3 * h items) |
| } ShowSpectrumContext; |
| |
| #define OFFSET(x) offsetof(ShowSpectrumContext, x) |
| #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| |
| static const AVOption showspectrum_options[] = { |
| { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x512"}, 0, 0, FLAGS }, |
| { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x512"}, 0, 0, FLAGS }, |
| { "slide", "set sliding mode", OFFSET(sliding), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS }, |
| { "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, COMBINED, NB_MODES-1, FLAGS, "mode" }, |
| { "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" }, |
| { "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" }, |
| { "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=CHANNEL}, CHANNEL, NB_CLMODES-1, FLAGS, "color" }, |
| { "channel", "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL}, 0, 0, FLAGS, "color" }, |
| { "intensity", "intensity based coloring", 0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" }, |
| { "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=SQRT}, LINEAR, NB_SCALES-1, FLAGS, "scale" }, |
| { "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT}, 0, 0, FLAGS, "scale" }, |
| { "cbrt", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64=CBRT}, 0, 0, FLAGS, "scale" }, |
| { "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, FLAGS, "scale" }, |
| { "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" }, |
| { "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS }, |
| { "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANN}, 0, NB_WFUNC-1, FLAGS, "win_func" }, |
| { "hann", "Hann window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_HANN}, 0, 0, FLAGS, "win_func" }, |
| { "hamming", "Hamming window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" }, |
| { "blackman", "Blackman window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(showspectrum); |
| |
| static const struct { |
| float a, y, u, v; |
| } intensity_color_table[] = { |
| { 0, 0, 0, 0 }, |
| { 0.13, .03587126228984074, .1573300977624594, -.02548747583751842 }, |
| { 0.30, .18572281794568020, .1772436246393981, .17475554840414750 }, |
| { 0.60, .28184980583656130, -.1593064119945782, .47132074554608920 }, |
| { 0.73, .65830621175547810, -.3716070802232764, .24352759331252930 }, |
| { 0.78, .76318535758242900, -.4307467689263783, .16866496622310430 }, |
| { 0.91, .95336363636363640, -.2045454545454546, .03313636363636363 }, |
| { 1, 1, 0, 0 } |
| }; |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| ShowSpectrumContext *s = ctx->priv; |
| int i; |
| |
| av_freep(&s->combine_buffer); |
| av_rdft_end(s->rdft); |
| for (i = 0; i < s->nb_display_channels; i++) |
| av_freep(&s->rdft_data[i]); |
| av_freep(&s->rdft_data); |
| av_freep(&s->window_func_lut); |
| av_frame_free(&s->outpicref); |
| } |
| |
| 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_S16P, AV_SAMPLE_FMT_NONE }; |
| static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE }; |
| |
| /* set input audio formats */ |
| formats = ff_make_format_list(sample_fmts); |
| if (!formats) |
| return AVERROR(ENOMEM); |
| ff_formats_ref(formats, &inlink->out_formats); |
| |
| layouts = ff_all_channel_layouts(); |
| if (!layouts) |
| return AVERROR(ENOMEM); |
| ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts); |
| |
| formats = ff_all_samplerates(); |
| if (!formats) |
| return AVERROR(ENOMEM); |
| ff_formats_ref(formats, &inlink->out_samplerates); |
| |
| /* set output video format */ |
| formats = ff_make_format_list(pix_fmts); |
| if (!formats) |
| return AVERROR(ENOMEM); |
| ff_formats_ref(formats, &outlink->in_formats); |
| |
| return 0; |
| } |
| |
| static int config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| ShowSpectrumContext *s = ctx->priv; |
| int i, rdft_bits, win_size, h; |
| |
| outlink->w = s->w; |
| outlink->h = s->h; |
| |
| h = (s->mode == COMBINED) ? outlink->h : outlink->h / inlink->channels; |
| s->channel_height = h; |
| |
| /* RDFT window size (precision) according to the requested output frame height */ |
| for (rdft_bits = 1; 1 << rdft_bits < 2 * h; rdft_bits++); |
| win_size = 1 << rdft_bits; |
| |
| /* (re-)configuration if the video output changed (or first init) */ |
| if (rdft_bits != s->rdft_bits) { |
| size_t rdft_size, rdft_listsize; |
| AVFrame *outpicref; |
| |
| av_rdft_end(s->rdft); |
| s->rdft = av_rdft_init(rdft_bits, DFT_R2C); |
| s->rdft_bits = rdft_bits; |
| |
| /* RDFT 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_display_channels; i++) |
| av_freep(&s->rdft_data[i]); |
| av_freep(&s->rdft_data); |
| s->nb_display_channels = inlink->channels; |
| |
| if (av_size_mult(sizeof(*s->rdft_data), |
| s->nb_display_channels, &rdft_listsize) < 0) |
| return AVERROR(EINVAL); |
| if (av_size_mult(sizeof(**s->rdft_data), |
| win_size, &rdft_size) < 0) |
| return AVERROR(EINVAL); |
| s->rdft_data = av_malloc(rdft_listsize); |
| if (!s->rdft_data) |
| return AVERROR(ENOMEM); |
| for (i = 0; i < s->nb_display_channels; i++) { |
| s->rdft_data[i] = av_malloc(rdft_size); |
| if (!s->rdft_data[i]) |
| return AVERROR(ENOMEM); |
| } |
| s->filled = 0; |
| |
| /* pre-calc windowing function */ |
| s->window_func_lut = |
| av_realloc_f(s->window_func_lut, win_size, |
| sizeof(*s->window_func_lut)); |
| if (!s->window_func_lut) |
| return AVERROR(ENOMEM); |
| switch (s->win_func) { |
| case WFUNC_NONE: |
| for (i = 0; i < win_size; i++) |
| s->window_func_lut[i] = 1.; |
| break; |
| case WFUNC_HANN: |
| for (i = 0; i < win_size; i++) |
| s->window_func_lut[i] = .5f * (1 - cos(2*M_PI*i / (win_size-1))); |
| break; |
| case WFUNC_HAMMING: |
| for (i = 0; i < win_size; i++) |
| s->window_func_lut[i] = .54f - .46f * cos(2*M_PI*i / (win_size-1)); |
| break; |
| case WFUNC_BLACKMAN: { |
| for (i = 0; i < win_size; i++) |
| s->window_func_lut[i] = .42f - .5f*cos(2*M_PI*i / (win_size-1)) + .08f*cos(4*M_PI*i / (win_size-1)); |
| break; |
| } |
| default: |
| av_assert0(0); |
| } |
| |
| /* prepare the initial picref buffer (black frame) */ |
| av_frame_free(&s->outpicref); |
| s->outpicref = outpicref = |
| ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| if (!outpicref) |
| return AVERROR(ENOMEM); |
| outlink->sample_aspect_ratio = (AVRational){1,1}; |
| for (i = 0; i < outlink->h; i++) { |
| memset(outpicref->data[0] + i * outpicref->linesize[0], 0, outlink->w); |
| memset(outpicref->data[1] + i * outpicref->linesize[1], 128, outlink->w); |
| memset(outpicref->data[2] + i * outpicref->linesize[2], 128, outlink->w); |
| } |
| } |
| |
| if (s->xpos >= outlink->w) |
| s->xpos = 0; |
| |
| s->combine_buffer = |
| av_realloc_f(s->combine_buffer, outlink->h * 3, |
| sizeof(*s->combine_buffer)); |
| |
| av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d RDFT window size:%d\n", |
| s->w, s->h, win_size); |
| return 0; |
| } |
| |
| inline static int push_frame(AVFilterLink *outlink) |
| { |
| ShowSpectrumContext *s = outlink->src->priv; |
| |
| s->xpos++; |
| if (s->xpos >= outlink->w) |
| s->xpos = 0; |
| s->filled = 0; |
| s->req_fullfilled = 1; |
| |
| return ff_filter_frame(outlink, av_frame_clone(s->outpicref)); |
| } |
| |
| static int request_frame(AVFilterLink *outlink) |
| { |
| ShowSpectrumContext *s = outlink->src->priv; |
| AVFilterLink *inlink = outlink->src->inputs[0]; |
| int ret; |
| |
| s->req_fullfilled = 0; |
| do { |
| ret = ff_request_frame(inlink); |
| } while (!s->req_fullfilled && ret >= 0); |
| |
| if (ret == AVERROR_EOF && s->outpicref) |
| push_frame(outlink); |
| return ret; |
| } |
| |
| static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples, int nb_samples) |
| { |
| int ret; |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| ShowSpectrumContext *s = ctx->priv; |
| AVFrame *outpicref = s->outpicref; |
| |
| /* nb_freq contains the power of two superior or equal to the output image |
| * height (or half the RDFT window size) */ |
| const int nb_freq = 1 << (s->rdft_bits - 1); |
| const int win_size = nb_freq << 1; |
| const double w = 1. / (sqrt(nb_freq) * 32768.); |
| |
| int ch, plane, n, y; |
| const int start = s->filled; |
| const int add_samples = FFMIN(win_size - start, nb_samples); |
| |
| /* fill RDFT input with the number of samples available */ |
| for (ch = 0; ch < s->nb_display_channels; ch++) { |
| const int16_t *p = (int16_t *)insamples->extended_data[ch]; |
| |
| p += s->consumed; |
| for (n = 0; n < add_samples; n++) |
| s->rdft_data[ch][start + n] = p[n] * s->window_func_lut[start + n]; |
| } |
| s->filled += add_samples; |
| |
| /* complete RDFT window size? */ |
| if (s->filled == win_size) { |
| |
| /* channel height */ |
| int h = s->channel_height; |
| |
| /* run RDFT on each samples set */ |
| for (ch = 0; ch < s->nb_display_channels; ch++) |
| av_rdft_calc(s->rdft, s->rdft_data[ch]); |
| |
| /* fill a new spectrum column */ |
| #define RE(y, ch) s->rdft_data[ch][2 * y + 0] |
| #define IM(y, ch) s->rdft_data[ch][2 * y + 1] |
| #define MAGNITUDE(y, ch) hypot(RE(y, ch), IM(y, ch)) |
| |
| /* initialize buffer for combining to black */ |
| for (y = 0; y < outlink->h; y++) { |
| s->combine_buffer[3 * y ] = 0; |
| s->combine_buffer[3 * y + 1] = 127.5; |
| s->combine_buffer[3 * y + 2] = 127.5; |
| } |
| |
| for (ch = 0; ch < s->nb_display_channels; ch++) { |
| float yf, uf, vf; |
| |
| /* decide color range */ |
| switch (s->mode) { |
| case COMBINED: |
| // reduce range by channel count |
| yf = 256.0f / s->nb_display_channels; |
| switch (s->color_mode) { |
| case INTENSITY: |
| uf = yf; |
| vf = yf; |
| break; |
| case CHANNEL: |
| /* adjust saturation for mixed UV coloring */ |
| /* this factor is correct for infinite channels, an approximation otherwise */ |
| uf = yf * M_PI; |
| vf = yf * M_PI; |
| break; |
| default: |
| av_assert0(0); |
| } |
| break; |
| case SEPARATE: |
| // full range |
| yf = 256.0f; |
| uf = 256.0f; |
| vf = 256.0f; |
| break; |
| default: |
| av_assert0(0); |
| } |
| |
| if (s->color_mode == CHANNEL) { |
| if (s->nb_display_channels > 1) { |
| uf *= 0.5 * sin((2 * M_PI * ch) / s->nb_display_channels); |
| vf *= 0.5 * cos((2 * M_PI * ch) / s->nb_display_channels); |
| } else { |
| uf = 0.0f; |
| vf = 0.0f; |
| } |
| } |
| uf *= s->saturation; |
| vf *= s->saturation; |
| |
| /* draw the channel */ |
| for (y = 0; y < h; y++) { |
| int row = (s->mode == COMBINED) ? y : ch * h + y; |
| float *out = &s->combine_buffer[3 * row]; |
| |
| /* get magnitude */ |
| float a = w * MAGNITUDE(y, ch); |
| |
| /* apply scale */ |
| switch (s->scale) { |
| case LINEAR: |
| break; |
| case SQRT: |
| a = sqrt(a); |
| break; |
| case CBRT: |
| a = cbrt(a); |
| break; |
| case LOG: |
| a = 1 - log(FFMAX(FFMIN(1, a), 1e-6)) / log(1e-6); // zero = -120dBFS |
| break; |
| default: |
| av_assert0(0); |
| } |
| |
| if (s->color_mode == INTENSITY) { |
| float y, u, v; |
| int i; |
| |
| for (i = 1; i < sizeof(intensity_color_table) / sizeof(*intensity_color_table) - 1; i++) |
| if (intensity_color_table[i].a >= a) |
| break; |
| // i now is the first item >= the color |
| // now we know to interpolate between item i - 1 and i |
| if (a <= intensity_color_table[i - 1].a) { |
| y = intensity_color_table[i - 1].y; |
| u = intensity_color_table[i - 1].u; |
| v = intensity_color_table[i - 1].v; |
| } else if (a >= intensity_color_table[i].a) { |
| y = intensity_color_table[i].y; |
| u = intensity_color_table[i].u; |
| v = intensity_color_table[i].v; |
| } else { |
| float start = intensity_color_table[i - 1].a; |
| float end = intensity_color_table[i].a; |
| float lerpfrac = (a - start) / (end - start); |
| y = intensity_color_table[i - 1].y * (1.0f - lerpfrac) |
| + intensity_color_table[i].y * lerpfrac; |
| u = intensity_color_table[i - 1].u * (1.0f - lerpfrac) |
| + intensity_color_table[i].u * lerpfrac; |
| v = intensity_color_table[i - 1].v * (1.0f - lerpfrac) |
| + intensity_color_table[i].v * lerpfrac; |
| } |
| |
| out[0] += y * yf; |
| out[1] += u * uf; |
| out[2] += v * vf; |
| } else { |
| out[0] += a * yf; |
| out[1] += a * uf; |
| out[2] += a * vf; |
| } |
| } |
| } |
| |
| /* copy to output */ |
| if (s->sliding) { |
| for (plane = 0; plane < 3; plane++) { |
| for (y = 0; y < outlink->h; y++) { |
| uint8_t *p = outpicref->data[plane] + |
| y * outpicref->linesize[plane]; |
| memmove(p, p + 1, outlink->w - 1); |
| } |
| } |
| s->xpos = outlink->w - 1; |
| } |
| for (plane = 0; plane < 3; plane++) { |
| uint8_t *p = outpicref->data[plane] + |
| (outlink->h - 1) * outpicref->linesize[plane] + |
| s->xpos; |
| for (y = 0; y < outlink->h; y++) { |
| *p = rint(FFMAX(0, FFMIN(s->combine_buffer[3 * y + plane], 255))); |
| p -= outpicref->linesize[plane]; |
| } |
| } |
| |
| outpicref->pts = insamples->pts + |
| av_rescale_q(s->consumed, |
| (AVRational){ 1, inlink->sample_rate }, |
| outlink->time_base); |
| ret = push_frame(outlink); |
| if (ret < 0) |
| return ret; |
| } |
| |
| return add_samples; |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *insamples) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| ShowSpectrumContext *s = ctx->priv; |
| int ret = 0, left_samples = insamples->nb_samples; |
| |
| s->consumed = 0; |
| while (left_samples) { |
| int ret = plot_spectrum_column(inlink, insamples, left_samples); |
| if (ret < 0) |
| break; |
| s->consumed += ret; |
| left_samples -= ret; |
| } |
| |
| av_frame_free(&insamples); |
| return ret; |
| } |
| |
| static const AVFilterPad showspectrum_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .filter_frame = filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad showspectrum_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_output, |
| .request_frame = request_frame, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_avf_showspectrum = { |
| .name = "showspectrum", |
| .description = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."), |
| .uninit = uninit, |
| .query_formats = query_formats, |
| .priv_size = sizeof(ShowSpectrumContext), |
| .inputs = showspectrum_inputs, |
| .outputs = showspectrum_outputs, |
| .priv_class = &showspectrum_class, |
| }; |