yading@10: /* yading@10: * Copyright (c) 2012 Clément Bœsch yading@10: * Copyright (c) 2013 Rudolf Polzer yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * audio to spectrum (video) transmedia filter, based on ffplay rdft showmode yading@10: * (by Michael Niedermayer) and lavfi/avf_showwaves (by Stefano Sabatini). yading@10: */ yading@10: yading@10: #include yading@10: yading@10: #include "libavcodec/avfft.h" yading@10: #include "libavutil/avassert.h" yading@10: #include "libavutil/channel_layout.h" yading@10: #include "libavutil/opt.h" yading@10: #include "avfilter.h" yading@10: #include "internal.h" yading@10: yading@10: enum DisplayMode { COMBINED, SEPARATE, NB_MODES }; yading@10: enum DisplayScale { LINEAR, SQRT, CBRT, LOG, NB_SCALES }; yading@10: enum ColorMode { CHANNEL, INTENSITY, NB_CLMODES }; yading@10: yading@10: typedef struct { yading@10: const AVClass *class; yading@10: int w, h; yading@10: AVFrame *outpicref; yading@10: int req_fullfilled; yading@10: int nb_display_channels; yading@10: int channel_height; yading@10: int sliding; ///< 1 if sliding mode, 0 otherwise yading@10: enum DisplayMode mode; ///< channel display mode yading@10: enum ColorMode color_mode; ///< display color scheme yading@10: enum DisplayScale scale; yading@10: float saturation; ///< color saturation multiplier yading@10: int xpos; ///< x position (current column) yading@10: RDFTContext *rdft; ///< Real Discrete Fourier Transform context yading@10: int rdft_bits; ///< number of bits (RDFT window size = 1<priv; yading@10: int i; yading@10: yading@10: av_freep(&showspectrum->combine_buffer); yading@10: av_rdft_end(showspectrum->rdft); yading@10: for (i = 0; i < showspectrum->nb_display_channels; i++) yading@10: av_freep(&showspectrum->rdft_data[i]); yading@10: av_freep(&showspectrum->rdft_data); yading@10: av_freep(&showspectrum->window_func_lut); yading@10: av_frame_free(&showspectrum->outpicref); yading@10: } yading@10: yading@10: static int query_formats(AVFilterContext *ctx) yading@10: { yading@10: AVFilterFormats *formats = NULL; yading@10: AVFilterChannelLayouts *layouts = NULL; yading@10: AVFilterLink *inlink = ctx->inputs[0]; yading@10: AVFilterLink *outlink = ctx->outputs[0]; yading@10: static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_NONE }; yading@10: static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE }; yading@10: yading@10: /* set input audio formats */ yading@10: formats = ff_make_format_list(sample_fmts); yading@10: if (!formats) yading@10: return AVERROR(ENOMEM); yading@10: ff_formats_ref(formats, &inlink->out_formats); yading@10: yading@10: layouts = ff_all_channel_layouts(); yading@10: if (!layouts) yading@10: return AVERROR(ENOMEM); yading@10: ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts); yading@10: yading@10: formats = ff_all_samplerates(); yading@10: if (!formats) yading@10: return AVERROR(ENOMEM); yading@10: ff_formats_ref(formats, &inlink->out_samplerates); yading@10: yading@10: /* set output video format */ yading@10: formats = ff_make_format_list(pix_fmts); yading@10: if (!formats) yading@10: return AVERROR(ENOMEM); yading@10: ff_formats_ref(formats, &outlink->in_formats); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int config_output(AVFilterLink *outlink) yading@10: { yading@10: AVFilterContext *ctx = outlink->src; yading@10: AVFilterLink *inlink = ctx->inputs[0]; yading@10: ShowSpectrumContext *showspectrum = ctx->priv; yading@10: int i, rdft_bits, win_size, h; yading@10: yading@10: outlink->w = showspectrum->w; yading@10: outlink->h = showspectrum->h; yading@10: yading@10: h = (showspectrum->mode == COMBINED) ? outlink->h : outlink->h / inlink->channels; yading@10: showspectrum->channel_height = h; yading@10: yading@10: /* RDFT window size (precision) according to the requested output frame height */ yading@10: for (rdft_bits = 1; 1 << rdft_bits < 2 * h; rdft_bits++); yading@10: win_size = 1 << rdft_bits; yading@10: yading@10: /* (re-)configuration if the video output changed (or first init) */ yading@10: if (rdft_bits != showspectrum->rdft_bits) { yading@10: size_t rdft_size, rdft_listsize; yading@10: AVFrame *outpicref; yading@10: yading@10: av_rdft_end(showspectrum->rdft); yading@10: showspectrum->rdft = av_rdft_init(rdft_bits, DFT_R2C); yading@10: showspectrum->rdft_bits = rdft_bits; yading@10: yading@10: /* RDFT buffers: x2 for each (display) channel buffer. yading@10: * Note: we use free and malloc instead of a realloc-like function to yading@10: * make sure the buffer is aligned in memory for the FFT functions. */ yading@10: for (i = 0; i < showspectrum->nb_display_channels; i++) yading@10: av_freep(&showspectrum->rdft_data[i]); yading@10: av_freep(&showspectrum->rdft_data); yading@10: showspectrum->nb_display_channels = inlink->channels; yading@10: yading@10: if (av_size_mult(sizeof(*showspectrum->rdft_data), yading@10: showspectrum->nb_display_channels, &rdft_listsize) < 0) yading@10: return AVERROR(EINVAL); yading@10: if (av_size_mult(sizeof(**showspectrum->rdft_data), yading@10: win_size, &rdft_size) < 0) yading@10: return AVERROR(EINVAL); yading@10: showspectrum->rdft_data = av_malloc(rdft_listsize); yading@10: if (!showspectrum->rdft_data) yading@10: return AVERROR(ENOMEM); yading@10: for (i = 0; i < showspectrum->nb_display_channels; i++) { yading@10: showspectrum->rdft_data[i] = av_malloc(rdft_size); yading@10: if (!showspectrum->rdft_data[i]) yading@10: return AVERROR(ENOMEM); yading@10: } yading@10: showspectrum->filled = 0; yading@10: yading@10: /* pre-calc windowing function (hann here) */ yading@10: showspectrum->window_func_lut = yading@10: av_realloc_f(showspectrum->window_func_lut, win_size, yading@10: sizeof(*showspectrum->window_func_lut)); yading@10: if (!showspectrum->window_func_lut) yading@10: return AVERROR(ENOMEM); yading@10: for (i = 0; i < win_size; i++) yading@10: showspectrum->window_func_lut[i] = .5f * (1 - cos(2*M_PI*i / (win_size-1))); yading@10: yading@10: /* prepare the initial picref buffer (black frame) */ yading@10: av_frame_free(&showspectrum->outpicref); yading@10: showspectrum->outpicref = outpicref = yading@10: ff_get_video_buffer(outlink, outlink->w, outlink->h); yading@10: if (!outpicref) yading@10: return AVERROR(ENOMEM); yading@10: outlink->sample_aspect_ratio = (AVRational){1,1}; yading@10: memset(outpicref->data[0], 0, outlink->h * outpicref->linesize[0]); yading@10: memset(outpicref->data[1], 128, outlink->h * outpicref->linesize[1]); yading@10: memset(outpicref->data[2], 128, outlink->h * outpicref->linesize[2]); yading@10: } yading@10: yading@10: if (showspectrum->xpos >= outlink->w) yading@10: showspectrum->xpos = 0; yading@10: yading@10: showspectrum->combine_buffer = yading@10: av_realloc_f(showspectrum->combine_buffer, outlink->h * 3, yading@10: sizeof(*showspectrum->combine_buffer)); yading@10: yading@10: av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d RDFT window size:%d\n", yading@10: showspectrum->w, showspectrum->h, win_size); yading@10: return 0; yading@10: } yading@10: yading@10: inline static int push_frame(AVFilterLink *outlink) yading@10: { yading@10: ShowSpectrumContext *showspectrum = outlink->src->priv; yading@10: yading@10: showspectrum->xpos++; yading@10: if (showspectrum->xpos >= outlink->w) yading@10: showspectrum->xpos = 0; yading@10: showspectrum->filled = 0; yading@10: showspectrum->req_fullfilled = 1; yading@10: yading@10: return ff_filter_frame(outlink, av_frame_clone(showspectrum->outpicref)); yading@10: } yading@10: yading@10: static int request_frame(AVFilterLink *outlink) yading@10: { yading@10: ShowSpectrumContext *showspectrum = outlink->src->priv; yading@10: AVFilterLink *inlink = outlink->src->inputs[0]; yading@10: int ret; yading@10: yading@10: showspectrum->req_fullfilled = 0; yading@10: do { yading@10: ret = ff_request_frame(inlink); yading@10: } while (!showspectrum->req_fullfilled && ret >= 0); yading@10: yading@10: if (ret == AVERROR_EOF && showspectrum->outpicref) yading@10: push_frame(outlink); yading@10: return ret; yading@10: } yading@10: yading@10: static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples, int nb_samples) yading@10: { yading@10: int ret; yading@10: AVFilterContext *ctx = inlink->dst; yading@10: AVFilterLink *outlink = ctx->outputs[0]; yading@10: ShowSpectrumContext *showspectrum = ctx->priv; yading@10: AVFrame *outpicref = showspectrum->outpicref; yading@10: yading@10: /* nb_freq contains the power of two superior or equal to the output image yading@10: * height (or half the RDFT window size) */ yading@10: const int nb_freq = 1 << (showspectrum->rdft_bits - 1); yading@10: const int win_size = nb_freq << 1; yading@10: const double w = 1. / (sqrt(nb_freq) * 32768.); yading@10: yading@10: int ch, plane, n, y; yading@10: const int start = showspectrum->filled; yading@10: const int add_samples = FFMIN(win_size - start, nb_samples); yading@10: yading@10: /* fill RDFT input with the number of samples available */ yading@10: for (ch = 0; ch < showspectrum->nb_display_channels; ch++) { yading@10: const int16_t *p = (int16_t *)insamples->extended_data[ch]; yading@10: yading@10: p += showspectrum->consumed; yading@10: for (n = 0; n < add_samples; n++) yading@10: showspectrum->rdft_data[ch][start + n] = p[n] * showspectrum->window_func_lut[start + n]; yading@10: } yading@10: showspectrum->filled += add_samples; yading@10: yading@10: /* complete RDFT window size? */ yading@10: if (showspectrum->filled == win_size) { yading@10: yading@10: /* channel height */ yading@10: int h = showspectrum->channel_height; yading@10: yading@10: /* run RDFT on each samples set */ yading@10: for (ch = 0; ch < showspectrum->nb_display_channels; ch++) yading@10: av_rdft_calc(showspectrum->rdft, showspectrum->rdft_data[ch]); yading@10: yading@10: /* fill a new spectrum column */ yading@10: #define RE(y, ch) showspectrum->rdft_data[ch][2 * y + 0] yading@10: #define IM(y, ch) showspectrum->rdft_data[ch][2 * y + 1] yading@10: #define MAGNITUDE(y, ch) hypot(RE(y, ch), IM(y, ch)) yading@10: yading@10: /* initialize buffer for combining to black */ yading@10: for (y = 0; y < outlink->h; y++) { yading@10: showspectrum->combine_buffer[3 * y ] = 0; yading@10: showspectrum->combine_buffer[3 * y + 1] = 127.5; yading@10: showspectrum->combine_buffer[3 * y + 2] = 127.5; yading@10: } yading@10: yading@10: for (ch = 0; ch < showspectrum->nb_display_channels; ch++) { yading@10: float yf, uf, vf; yading@10: yading@10: /* decide color range */ yading@10: switch (showspectrum->mode) { yading@10: case COMBINED: yading@10: // reduce range by channel count yading@10: yf = 256.0f / showspectrum->nb_display_channels; yading@10: switch (showspectrum->color_mode) { yading@10: case INTENSITY: yading@10: uf = yf; yading@10: vf = yf; yading@10: break; yading@10: case CHANNEL: yading@10: /* adjust saturation for mixed UV coloring */ yading@10: /* this factor is correct for infinite channels, an approximation otherwise */ yading@10: uf = yf * M_PI; yading@10: vf = yf * M_PI; yading@10: break; yading@10: default: yading@10: av_assert0(0); yading@10: } yading@10: break; yading@10: case SEPARATE: yading@10: // full range yading@10: yf = 256.0f; yading@10: uf = 256.0f; yading@10: vf = 256.0f; yading@10: break; yading@10: default: yading@10: av_assert0(0); yading@10: } yading@10: yading@10: if (showspectrum->color_mode == CHANNEL) { yading@10: if (showspectrum->nb_display_channels > 1) { yading@10: uf *= 0.5 * sin((2 * M_PI * ch) / showspectrum->nb_display_channels); yading@10: vf *= 0.5 * cos((2 * M_PI * ch) / showspectrum->nb_display_channels); yading@10: } else { yading@10: uf = 0.0f; yading@10: vf = 0.0f; yading@10: } yading@10: } yading@10: uf *= showspectrum->saturation; yading@10: vf *= showspectrum->saturation; yading@10: yading@10: /* draw the channel */ yading@10: for (y = 0; y < h; y++) { yading@10: int row = (showspectrum->mode == COMBINED) ? y : ch * h + y; yading@10: float *out = &showspectrum->combine_buffer[3 * row]; yading@10: yading@10: /* get magnitude */ yading@10: float a = w * MAGNITUDE(y, ch); yading@10: yading@10: /* apply scale */ yading@10: switch (showspectrum->scale) { yading@10: case LINEAR: yading@10: break; yading@10: case SQRT: yading@10: a = sqrt(a); yading@10: break; yading@10: case CBRT: yading@10: a = cbrt(a); yading@10: break; yading@10: case LOG: yading@10: a = 1 - log(FFMAX(FFMIN(1, a), 1e-6)) / log(1e-6); // zero = -120dBFS yading@10: break; yading@10: default: yading@10: av_assert0(0); yading@10: } yading@10: yading@10: if (showspectrum->color_mode == INTENSITY) { yading@10: float y, u, v; yading@10: int i; yading@10: yading@10: for (i = 1; i < sizeof(intensity_color_table) / sizeof(*intensity_color_table) - 1; i++) yading@10: if (intensity_color_table[i].a >= a) yading@10: break; yading@10: // i now is the first item >= the color yading@10: // now we know to interpolate between item i - 1 and i yading@10: if (a <= intensity_color_table[i - 1].a) { yading@10: y = intensity_color_table[i - 1].y; yading@10: u = intensity_color_table[i - 1].u; yading@10: v = intensity_color_table[i - 1].v; yading@10: } else if (a >= intensity_color_table[i].a) { yading@10: y = intensity_color_table[i].y; yading@10: u = intensity_color_table[i].u; yading@10: v = intensity_color_table[i].v; yading@10: } else { yading@10: float start = intensity_color_table[i - 1].a; yading@10: float end = intensity_color_table[i].a; yading@10: float lerpfrac = (a - start) / (end - start); yading@10: y = intensity_color_table[i - 1].y * (1.0f - lerpfrac) yading@10: + intensity_color_table[i].y * lerpfrac; yading@10: u = intensity_color_table[i - 1].u * (1.0f - lerpfrac) yading@10: + intensity_color_table[i].u * lerpfrac; yading@10: v = intensity_color_table[i - 1].v * (1.0f - lerpfrac) yading@10: + intensity_color_table[i].v * lerpfrac; yading@10: } yading@10: yading@10: out[0] += y * yf; yading@10: out[1] += u * uf; yading@10: out[2] += v * vf; yading@10: } else { yading@10: out[0] += a * yf; yading@10: out[1] += a * uf; yading@10: out[2] += a * vf; yading@10: } yading@10: } yading@10: } yading@10: yading@10: /* copy to output */ yading@10: if (showspectrum->sliding) { yading@10: for (plane = 0; plane < 3; plane++) { yading@10: for (y = 0; y < outlink->h; y++) { yading@10: uint8_t *p = outpicref->data[plane] + yading@10: y * outpicref->linesize[plane]; yading@10: memmove(p, p + 1, outlink->w - 1); yading@10: } yading@10: } yading@10: showspectrum->xpos = outlink->w - 1; yading@10: } yading@10: for (plane = 0; plane < 3; plane++) { yading@10: uint8_t *p = outpicref->data[plane] + yading@10: (outlink->h - 1) * outpicref->linesize[plane] + yading@10: showspectrum->xpos; yading@10: for (y = 0; y < outlink->h; y++) { yading@10: *p = rint(FFMAX(0, FFMIN(showspectrum->combine_buffer[3 * y + plane], 255))); yading@10: p -= outpicref->linesize[plane]; yading@10: } yading@10: } yading@10: yading@10: outpicref->pts = insamples->pts + yading@10: av_rescale_q(showspectrum->consumed, yading@10: (AVRational){ 1, inlink->sample_rate }, yading@10: outlink->time_base); yading@10: ret = push_frame(outlink); yading@10: if (ret < 0) yading@10: return ret; yading@10: } yading@10: yading@10: return add_samples; yading@10: } yading@10: yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *insamples) yading@10: { yading@10: AVFilterContext *ctx = inlink->dst; yading@10: ShowSpectrumContext *showspectrum = ctx->priv; yading@10: int ret = 0, left_samples = insamples->nb_samples; yading@10: yading@10: showspectrum->consumed = 0; yading@10: while (left_samples) { yading@10: int ret = plot_spectrum_column(inlink, insamples, left_samples); yading@10: if (ret < 0) yading@10: break; yading@10: showspectrum->consumed += ret; yading@10: left_samples -= ret; yading@10: } yading@10: yading@10: av_frame_free(&insamples); yading@10: return ret; yading@10: } yading@10: yading@10: static const AVFilterPad showspectrum_inputs[] = { yading@10: { yading@10: .name = "default", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .filter_frame = filter_frame, yading@10: }, yading@10: { NULL } yading@10: }; yading@10: yading@10: static const AVFilterPad showspectrum_outputs[] = { yading@10: { yading@10: .name = "default", yading@10: .type = AVMEDIA_TYPE_VIDEO, yading@10: .config_props = config_output, yading@10: .request_frame = request_frame, yading@10: }, yading@10: { NULL } yading@10: }; yading@10: yading@10: AVFilter avfilter_avf_showspectrum = { yading@10: .name = "showspectrum", yading@10: .description = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."), yading@10: .uninit = uninit, yading@10: .query_formats = query_formats, yading@10: .priv_size = sizeof(ShowSpectrumContext), yading@10: .inputs = showspectrum_inputs, yading@10: .outputs = showspectrum_outputs, yading@10: .priv_class = &showspectrum_class, yading@10: };