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Diffstat (limited to 'libavfilter/avf_showspectrum.c')
| -rw-r--r-- | libavfilter/avf_showspectrum.c | 532 |
1 files changed, 532 insertions, 0 deletions
diff --git a/libavfilter/avf_showspectrum.c b/libavfilter/avf_showspectrum.c new file mode 100644 index 0000000..24116da --- /dev/null +++ b/libavfilter/avf_showspectrum.c @@ -0,0 +1,532 @@ +/* + * 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 }; +enum SlideMode { REPLACE, SCROLL, FULLFRAME, NB_SLIDES }; + +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 + 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, NB_SLIDES, FLAGS, "slide" }, + { "replace", "replace old columns with new", 0, AV_OPT_TYPE_CONST, {.i64=REPLACE}, 0, 0, FLAGS, "slide" }, + { "scroll", "scroll from right to left", 0, AV_OPT_TYPE_CONST, {.i64=SCROLL}, 0, 0, FLAGS, "slide" }, + { "fullframe", "return full frames", 0, AV_OPT_TYPE_CONST, {.i64=FULLFRAME}, 0, 0, FLAGS, "slide" }, + { "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); + if (!s->rdft) { + av_log(ctx, AV_LOG_ERROR, "Unable to create RDFT context. " + "The window size might be too high.\n"); + return AVERROR(EINVAL); + } + 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); + } + + /* 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; + + outlink->frame_rate = av_make_q(inlink->sample_rate, win_size); + if (s->sliding == FULLFRAME) + outlink->frame_rate.den *= outlink->w; + + inlink->min_samples = inlink->max_samples = inlink->partial_buf_size = + win_size; + + 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; +} + +static int request_frame(AVFilterLink *outlink) +{ + ShowSpectrumContext *s = outlink->src->priv; + AVFilterLink *inlink = outlink->src->inputs[0]; + unsigned i; + int ret; + + s->req_fullfilled = 0; + do { + ret = ff_request_frame(inlink); + if (ret == AVERROR_EOF && s->sliding == FULLFRAME && s->xpos > 0 && + s->outpicref) { + for (i = 0; i < outlink->h; i++) { + memset(s->outpicref->data[0] + i * s->outpicref->linesize[0] + s->xpos, 0, outlink->w - s->xpos); + memset(s->outpicref->data[1] + i * s->outpicref->linesize[1] + s->xpos, 128, outlink->w - s->xpos); + memset(s->outpicref->data[2] + i * s->outpicref->linesize[2] + s->xpos, 128, outlink->w - s->xpos); + } + ret = ff_filter_frame(outlink, s->outpicref); + s->outpicref = NULL; + s->req_fullfilled = 1; + } + } while (!s->req_fullfilled && ret >= 0); + + return ret; +} + +static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples) +{ + 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 h = s->channel_height; + + int ch, plane, n, y; + + av_assert0(insamples->nb_samples == win_size); + + /* 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]; + + for (n = 0; n < win_size; n++) + s->rdft_data[ch][n] = p[n] * s->window_func_lut[n]; + } + + /* TODO reindent */ + + /* 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 == SCROLL) { + 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]; + } + } + + if (s->sliding != FULLFRAME || s->xpos == 0) + outpicref->pts = insamples->pts; + + s->xpos++; + if (s->xpos >= outlink->w) + s->xpos = 0; + if (s->sliding != FULLFRAME || s->xpos == 0) { + s->req_fullfilled = 1; + ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref)); + if (ret < 0) + return ret; + } + + return win_size; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *insamples) +{ + AVFilterContext *ctx = inlink->dst; + ShowSpectrumContext *s = ctx->priv; + unsigned win_size = 1 << s->rdft_bits; + int ret = 0; + + av_assert0(insamples->nb_samples <= win_size); + if (insamples->nb_samples == win_size) + ret = plot_spectrum_column(inlink, insamples); + + 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, +}; |
