| /* |
| * Copyright (c) 2014 Muhammad Faiz <mfcc64@gmail.com> |
| * |
| * 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 "config.h" |
| #include "libavcodec/avfft.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/xga_font_data.h" |
| #include "libavutil/qsort.h" |
| #include "libavutil/time.h" |
| #include "libavutil/eval.h" |
| #include "avfilter.h" |
| #include "internal.h" |
| |
| #include <math.h> |
| #include <stdlib.h> |
| |
| #if CONFIG_LIBFREETYPE |
| #include <ft2build.h> |
| #include FT_FREETYPE_H |
| #endif |
| |
| /* this filter is designed to do 16 bins/semitones constant Q transform with Brown-Puckette algorithm |
| * start from E0 to D#10 (10 octaves) |
| * so there are 16 bins/semitones * 12 semitones/octaves * 10 octaves = 1920 bins |
| * match with full HD resolution */ |
| |
| #define VIDEO_WIDTH 1920 |
| #define VIDEO_HEIGHT 1080 |
| #define FONT_HEIGHT 32 |
| #define SPECTOGRAM_HEIGHT ((VIDEO_HEIGHT-FONT_HEIGHT)/2) |
| #define SPECTOGRAM_START (VIDEO_HEIGHT-SPECTOGRAM_HEIGHT) |
| #define BASE_FREQ 20.051392800492 |
| #define COEFF_CLAMP 1.0e-4 |
| #define TLENGTH_MIN 0.001 |
| #define TLENGTH_DEFAULT "384/f*tc/(384/f+tc)" |
| #define VOLUME_MIN 1e-10 |
| #define VOLUME_MAX 100.0 |
| #define FONTCOLOR_DEFAULT "st(0, (midi(f)-59.5)/12);" \ |
| "st(1, if(between(ld(0),0,1), 0.5-0.5*cos(2*PI*ld(0)), 0));" \ |
| "r(1-ld(1)) + b(ld(1))" |
| |
| typedef struct { |
| FFTSample value; |
| int index; |
| } SparseCoeff; |
| |
| typedef struct { |
| const AVClass *class; |
| AVFrame *outpicref; |
| FFTContext *fft_context; |
| FFTComplex *fft_data; |
| FFTComplex *fft_result_left; |
| FFTComplex *fft_result_right; |
| uint8_t *spectogram; |
| SparseCoeff *coeff_sort; |
| SparseCoeff *coeffs[VIDEO_WIDTH]; |
| uint8_t *font_alpha; |
| char *fontfile; /* using freetype */ |
| int coeffs_len[VIDEO_WIDTH]; |
| uint8_t fontcolor_value[VIDEO_WIDTH*3]; /* result of fontcolor option */ |
| int64_t frame_count; |
| int spectogram_count; |
| int spectogram_index; |
| int fft_bits; |
| int req_fullfilled; |
| int remaining_fill; |
| char *tlength; |
| char *volume; |
| char *fontcolor; |
| double timeclamp; /* lower timeclamp, time-accurate, higher timeclamp, freq-accurate (at low freq)*/ |
| float coeffclamp; /* lower coeffclamp, more precise, higher coeffclamp, faster */ |
| int fullhd; /* if true, output video is at full HD resolution, otherwise it will be halved */ |
| float gamma; /* lower gamma, more contrast, higher gamma, more range */ |
| float gamma2; /* gamma of bargraph */ |
| int fps; /* the required fps is so strict, so it's enough to be int, but 24000/1001 etc cannot be encoded */ |
| int count; /* fps * count = transform rate */ |
| } ShowCQTContext; |
| |
| #define OFFSET(x) offsetof(ShowCQTContext, x) |
| #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| |
| static const AVOption showcqt_options[] = { |
| { "volume", "set volume", OFFSET(volume), AV_OPT_TYPE_STRING, { .str = "16" }, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "tlength", "set transform length", OFFSET(tlength), AV_OPT_TYPE_STRING, { .str = TLENGTH_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "timeclamp", "set timeclamp", OFFSET(timeclamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.17 }, 0.1, 1.0, FLAGS }, |
| { "coeffclamp", "set coeffclamp", OFFSET(coeffclamp), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 0.1, 10, FLAGS }, |
| { "gamma", "set gamma", OFFSET(gamma), AV_OPT_TYPE_FLOAT, { .dbl = 3 }, 1, 7, FLAGS }, |
| { "gamma2", "set gamma of bargraph", OFFSET(gamma2), AV_OPT_TYPE_FLOAT, { .dbl = 1 }, 1, 7, FLAGS }, |
| { "fullhd", "set full HD resolution", OFFSET(fullhd), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, FLAGS }, |
| { "fps", "set video fps", OFFSET(fps), AV_OPT_TYPE_INT, { .i64 = 25 }, 10, 100, FLAGS }, |
| { "count", "set number of transform per frame", OFFSET(count), AV_OPT_TYPE_INT, { .i64 = 6 }, 1, 30, FLAGS }, |
| { "fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { "fontcolor", "set font color", OFFSET(fontcolor), AV_OPT_TYPE_STRING, { .str = FONTCOLOR_DEFAULT }, CHAR_MIN, CHAR_MAX, FLAGS }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(showcqt); |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| int k; |
| |
| ShowCQTContext *s = ctx->priv; |
| av_fft_end(s->fft_context); |
| s->fft_context = NULL; |
| for (k = 0; k < VIDEO_WIDTH; k++) |
| av_freep(&s->coeffs[k]); |
| av_freep(&s->fft_data); |
| av_freep(&s->fft_result_left); |
| av_freep(&s->fft_result_right); |
| av_freep(&s->coeff_sort); |
| av_freep(&s->spectogram); |
| av_freep(&s->font_alpha); |
| 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_FLT, AV_SAMPLE_FMT_NONE }; |
| static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB24, AV_PIX_FMT_NONE }; |
| static const int64_t channel_layouts[] = { AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_STEREO_DOWNMIX, -1 }; |
| static const int samplerates[] = { 44100, 48000, -1 }; |
| |
| /* set input audio formats */ |
| formats = ff_make_format_list(sample_fmts); |
| if (!formats) |
| return AVERROR(ENOMEM); |
| ff_formats_ref(formats, &inlink->out_formats); |
| |
| layouts = avfilter_make_format64_list(channel_layouts); |
| if (!layouts) |
| return AVERROR(ENOMEM); |
| ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts); |
| |
| formats = ff_make_format_list(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; |
| } |
| |
| #if CONFIG_LIBFREETYPE |
| static void load_freetype_font(AVFilterContext *ctx) |
| { |
| static const char str[] = "EF G A BC D "; |
| ShowCQTContext *s = ctx->priv; |
| FT_Library lib = NULL; |
| FT_Face face = NULL; |
| int video_scale = s->fullhd ? 2 : 1; |
| int video_width = (VIDEO_WIDTH/2) * video_scale; |
| int font_height = (FONT_HEIGHT/2) * video_scale; |
| int font_width = 8 * video_scale; |
| int font_repeat = font_width * 12; |
| int linear_hori_advance = font_width * 65536; |
| int non_monospace_warning = 0; |
| int x; |
| |
| s->font_alpha = NULL; |
| |
| if (!s->fontfile) |
| return; |
| |
| if (FT_Init_FreeType(&lib)) |
| goto fail; |
| |
| if (FT_New_Face(lib, s->fontfile, 0, &face)) |
| goto fail; |
| |
| if (FT_Set_Char_Size(face, 16*64, 0, 0, 0)) |
| goto fail; |
| |
| if (FT_Load_Char(face, 'A', FT_LOAD_RENDER)) |
| goto fail; |
| |
| if (FT_Set_Char_Size(face, 16*64 * linear_hori_advance / face->glyph->linearHoriAdvance, 0, 0, 0)) |
| goto fail; |
| |
| s->font_alpha = av_malloc_array(font_height, video_width); |
| if (!s->font_alpha) |
| goto fail; |
| |
| memset(s->font_alpha, 0, font_height * video_width); |
| |
| for (x = 0; x < 12; x++) { |
| int sx, sy, rx, bx, by, dx, dy; |
| |
| if (str[x] == ' ') |
| continue; |
| |
| if (FT_Load_Char(face, str[x], FT_LOAD_RENDER)) |
| goto fail; |
| |
| if (face->glyph->advance.x != font_width*64 && !non_monospace_warning) { |
| av_log(ctx, AV_LOG_WARNING, "Font is not monospace\n"); |
| non_monospace_warning = 1; |
| } |
| |
| sy = font_height - 4*video_scale - face->glyph->bitmap_top; |
| for (rx = 0; rx < 10; rx++) { |
| sx = rx * font_repeat + x * font_width + face->glyph->bitmap_left; |
| for (by = 0; by < face->glyph->bitmap.rows; by++) { |
| dy = by + sy; |
| if (dy < 0) |
| continue; |
| if (dy >= font_height) |
| break; |
| |
| for (bx = 0; bx < face->glyph->bitmap.width; bx++) { |
| dx = bx + sx; |
| if (dx < 0) |
| continue; |
| if (dx >= video_width) |
| break; |
| s->font_alpha[dy*video_width+dx] = face->glyph->bitmap.buffer[by*face->glyph->bitmap.width+bx]; |
| } |
| } |
| } |
| } |
| |
| FT_Done_Face(face); |
| FT_Done_FreeType(lib); |
| return; |
| |
| fail: |
| av_log(ctx, AV_LOG_WARNING, "Error while loading freetype font, using default font instead\n"); |
| FT_Done_Face(face); |
| FT_Done_FreeType(lib); |
| av_freep(&s->font_alpha); |
| return; |
| } |
| #endif |
| |
| static double a_weighting(void *p, double f) |
| { |
| double ret = 12200.0*12200.0 * (f*f*f*f); |
| ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) * |
| sqrt((f*f + 107.7*107.7) * (f*f + 737.9*737.9)); |
| return ret; |
| } |
| |
| static double b_weighting(void *p, double f) |
| { |
| double ret = 12200.0*12200.0 * (f*f*f); |
| ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0) * sqrt(f*f + 158.5*158.5); |
| return ret; |
| } |
| |
| static double c_weighting(void *p, double f) |
| { |
| double ret = 12200.0*12200.0 * (f*f); |
| ret /= (f*f + 20.6*20.6) * (f*f + 12200.0*12200.0); |
| return ret; |
| } |
| |
| static double midi(void *p, double f) |
| { |
| return log2(f/440.0) * 12.0 + 69.0; |
| } |
| |
| static double r_func(void *p, double x) |
| { |
| x = av_clipd(x, 0.0, 1.0); |
| return (int)(x*255.0+0.5) << 16; |
| } |
| |
| static double g_func(void *p, double x) |
| { |
| x = av_clipd(x, 0.0, 1.0); |
| return (int)(x*255.0+0.5) << 8; |
| } |
| |
| static double b_func(void *p, double x) |
| { |
| x = av_clipd(x, 0.0, 1.0); |
| return (int)(x*255.0+0.5); |
| } |
| |
| static inline int qsort_sparsecoeff(const SparseCoeff *a, const SparseCoeff *b) |
| { |
| if (fabsf(a->value) >= fabsf(b->value)) |
| return 1; |
| else |
| return -1; |
| } |
| |
| static int config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| ShowCQTContext *s = ctx->priv; |
| AVExpr *tlength_expr = NULL, *volume_expr = NULL, *fontcolor_expr = NULL; |
| uint8_t *fontcolor_value = s->fontcolor_value; |
| static const char * const expr_vars[] = { "timeclamp", "tc", "frequency", "freq", "f", NULL }; |
| static const char * const expr_func_names[] = { "a_weighting", "b_weighting", "c_weighting", NULL }; |
| static const char * const expr_fontcolor_func_names[] = { "midi", "r", "g", "b", NULL }; |
| static double (* const expr_funcs[])(void *, double) = { a_weighting, b_weighting, c_weighting, NULL }; |
| static double (* const expr_fontcolor_funcs[])(void *, double) = { midi, r_func, g_func, b_func, NULL }; |
| int fft_len, k, x, y, ret; |
| int num_coeffs = 0; |
| int rate = inlink->sample_rate; |
| double max_len = rate * (double) s->timeclamp; |
| int64_t start_time, end_time; |
| int video_scale = s->fullhd ? 2 : 1; |
| int video_width = (VIDEO_WIDTH/2) * video_scale; |
| int video_height = (VIDEO_HEIGHT/2) * video_scale; |
| int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale; |
| |
| s->fft_bits = ceil(log2(max_len)); |
| fft_len = 1 << s->fft_bits; |
| |
| if (rate % (s->fps * s->count)) { |
| av_log(ctx, AV_LOG_ERROR, "Rate (%u) is not divisible by fps*count (%u*%u)\n", rate, s->fps, s->count); |
| return AVERROR(EINVAL); |
| } |
| |
| s->fft_data = av_malloc_array(fft_len, sizeof(*s->fft_data)); |
| s->coeff_sort = av_malloc_array(fft_len, sizeof(*s->coeff_sort)); |
| s->fft_result_left = av_malloc_array(fft_len, sizeof(*s->fft_result_left)); |
| s->fft_result_right = av_malloc_array(fft_len, sizeof(*s->fft_result_right)); |
| s->fft_context = av_fft_init(s->fft_bits, 0); |
| |
| if (!s->fft_data || !s->coeff_sort || !s->fft_result_left || !s->fft_result_right || !s->fft_context) |
| return AVERROR(ENOMEM); |
| |
| #if CONFIG_LIBFREETYPE |
| load_freetype_font(ctx); |
| #else |
| if (s->fontfile) |
| av_log(ctx, AV_LOG_WARNING, "Freetype is not available, ignoring fontfile option\n"); |
| s->font_alpha = NULL; |
| #endif |
| |
| av_log(ctx, AV_LOG_INFO, "Calculating spectral kernel, please wait\n"); |
| start_time = av_gettime_relative(); |
| ret = av_expr_parse(&tlength_expr, s->tlength, expr_vars, NULL, NULL, NULL, NULL, 0, ctx); |
| if (ret < 0) |
| goto eval_error; |
| |
| ret = av_expr_parse(&volume_expr, s->volume, expr_vars, expr_func_names, |
| expr_funcs, NULL, NULL, 0, ctx); |
| if (ret < 0) |
| goto eval_error; |
| |
| ret = av_expr_parse(&fontcolor_expr, s->fontcolor, expr_vars, expr_fontcolor_func_names, |
| expr_fontcolor_funcs, NULL, NULL, 0, ctx); |
| if (ret < 0) |
| goto eval_error; |
| |
| for (k = 0; k < VIDEO_WIDTH; k++) { |
| int hlen = fft_len >> 1; |
| float total = 0; |
| float partial = 0; |
| double freq = BASE_FREQ * exp2(k * (1.0/192.0)); |
| double tlen, tlength, volume; |
| double expr_vars_val[] = { s->timeclamp, s->timeclamp, freq, freq, freq, 0 }; |
| /* a window function from Albert H. Nuttall, |
| * "Some Windows with Very Good Sidelobe Behavior" |
| * -93.32 dB peak sidelobe and 18 dB/octave asymptotic decay |
| * coefficient normalized to a0 = 1 */ |
| double a0 = 0.355768; |
| double a1 = 0.487396/a0; |
| double a2 = 0.144232/a0; |
| double a3 = 0.012604/a0; |
| double sv_step, cv_step, sv, cv; |
| double sw_step, cw_step, sw, cw, w; |
| |
| tlength = av_expr_eval(tlength_expr, expr_vars_val, NULL); |
| if (isnan(tlength)) { |
| av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is nan, setting it to %g\n", freq, s->timeclamp); |
| tlength = s->timeclamp; |
| } else if (tlength < TLENGTH_MIN) { |
| av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, TLENGTH_MIN); |
| tlength = TLENGTH_MIN; |
| } else if (tlength > s->timeclamp) { |
| av_log(ctx, AV_LOG_WARNING, "at freq %g: tlength is %g, setting it to %g\n", freq, tlength, s->timeclamp); |
| tlength = s->timeclamp; |
| } |
| |
| volume = FFABS(av_expr_eval(volume_expr, expr_vars_val, NULL)); |
| if (isnan(volume)) { |
| av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is nan, setting it to 0\n", freq); |
| volume = VOLUME_MIN; |
| } else if (volume < VOLUME_MIN) { |
| volume = VOLUME_MIN; |
| } else if (volume > VOLUME_MAX) { |
| av_log(ctx, AV_LOG_WARNING, "at freq %g: volume is %g, setting it to %g\n", freq, volume, VOLUME_MAX); |
| volume = VOLUME_MAX; |
| } |
| |
| if (s->fullhd || !(k & 1)) { |
| int fontcolor = av_expr_eval(fontcolor_expr, expr_vars_val, NULL); |
| fontcolor_value[0] = (fontcolor >> 16) & 0xFF; |
| fontcolor_value[1] = (fontcolor >> 8) & 0xFF; |
| fontcolor_value[2] = fontcolor & 0xFF; |
| fontcolor_value += 3; |
| } |
| |
| tlen = tlength * rate; |
| s->fft_data[0].re = 0; |
| s->fft_data[0].im = 0; |
| s->fft_data[hlen].re = (1.0 + a1 + a2 + a3) * (1.0/tlen) * volume * (1.0/fft_len); |
| s->fft_data[hlen].im = 0; |
| sv_step = sv = sin(2.0*M_PI*freq*(1.0/rate)); |
| cv_step = cv = cos(2.0*M_PI*freq*(1.0/rate)); |
| /* also optimizing window func */ |
| sw_step = sw = sin(2.0*M_PI*(1.0/tlen)); |
| cw_step = cw = cos(2.0*M_PI*(1.0/tlen)); |
| for (x = 1; x < 0.5 * tlen; x++) { |
| double cv_tmp, cw_tmp; |
| double cw2, cw3, sw2; |
| |
| cw2 = cw * cw - sw * sw; |
| sw2 = cw * sw + sw * cw; |
| cw3 = cw * cw2 - sw * sw2; |
| w = (1.0 + a1 * cw + a2 * cw2 + a3 * cw3) * (1.0/tlen) * volume * (1.0/fft_len); |
| s->fft_data[hlen + x].re = w * cv; |
| s->fft_data[hlen + x].im = w * sv; |
| s->fft_data[hlen - x].re = s->fft_data[hlen + x].re; |
| s->fft_data[hlen - x].im = -s->fft_data[hlen + x].im; |
| |
| cv_tmp = cv * cv_step - sv * sv_step; |
| sv = sv * cv_step + cv * sv_step; |
| cv = cv_tmp; |
| cw_tmp = cw * cw_step - sw * sw_step; |
| sw = sw * cw_step + cw * sw_step; |
| cw = cw_tmp; |
| } |
| for (; x < hlen; x++) { |
| s->fft_data[hlen + x].re = 0; |
| s->fft_data[hlen + x].im = 0; |
| s->fft_data[hlen - x].re = 0; |
| s->fft_data[hlen - x].im = 0; |
| } |
| av_fft_permute(s->fft_context, s->fft_data); |
| av_fft_calc(s->fft_context, s->fft_data); |
| |
| for (x = 0; x < fft_len; x++) { |
| s->coeff_sort[x].index = x; |
| s->coeff_sort[x].value = s->fft_data[x].re; |
| } |
| |
| AV_QSORT(s->coeff_sort, fft_len, SparseCoeff, qsort_sparsecoeff); |
| for (x = 0; x < fft_len; x++) |
| total += fabsf(s->coeff_sort[x].value); |
| |
| for (x = 0; x < fft_len; x++) { |
| partial += fabsf(s->coeff_sort[x].value); |
| if (partial > total * s->coeffclamp * COEFF_CLAMP) { |
| s->coeffs_len[k] = fft_len - x; |
| num_coeffs += s->coeffs_len[k]; |
| s->coeffs[k] = av_malloc_array(s->coeffs_len[k], sizeof(*s->coeffs[k])); |
| if (!s->coeffs[k]) { |
| ret = AVERROR(ENOMEM); |
| goto eval_error; |
| } |
| for (y = 0; y < s->coeffs_len[k]; y++) |
| s->coeffs[k][y] = s->coeff_sort[x+y]; |
| break; |
| } |
| } |
| } |
| av_expr_free(fontcolor_expr); |
| av_expr_free(volume_expr); |
| av_expr_free(tlength_expr); |
| end_time = av_gettime_relative(); |
| av_log(ctx, AV_LOG_INFO, "Elapsed time %.6f s (fft_len=%u, num_coeffs=%u)\n", 1e-6 * (end_time-start_time), fft_len, num_coeffs); |
| |
| outlink->w = video_width; |
| outlink->h = video_height; |
| |
| s->req_fullfilled = 0; |
| s->spectogram_index = 0; |
| s->frame_count = 0; |
| s->spectogram_count = 0; |
| s->remaining_fill = fft_len >> 1; |
| memset(s->fft_data, 0, fft_len * sizeof(*s->fft_data)); |
| |
| s->outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| if (!s->outpicref) |
| return AVERROR(ENOMEM); |
| |
| s->spectogram = av_calloc(spectogram_height, s->outpicref->linesize[0]); |
| if (!s->spectogram) |
| return AVERROR(ENOMEM); |
| |
| outlink->sample_aspect_ratio = av_make_q(1, 1); |
| outlink->time_base = av_make_q(1, s->fps); |
| outlink->frame_rate = av_make_q(s->fps, 1); |
| return 0; |
| |
| eval_error: |
| av_expr_free(fontcolor_expr); |
| av_expr_free(volume_expr); |
| av_expr_free(tlength_expr); |
| return ret; |
| } |
| |
| static int plot_cqt(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| ShowCQTContext *s = ctx->priv; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| int fft_len = 1 << s->fft_bits; |
| FFTSample result[VIDEO_WIDTH][4]; |
| int x, y, ret = 0; |
| int linesize = s->outpicref->linesize[0]; |
| int video_scale = s->fullhd ? 2 : 1; |
| int video_width = (VIDEO_WIDTH/2) * video_scale; |
| int spectogram_height = (SPECTOGRAM_HEIGHT/2) * video_scale; |
| int spectogram_start = (SPECTOGRAM_START/2) * video_scale; |
| int font_height = (FONT_HEIGHT/2) * video_scale; |
| |
| /* real part contains left samples, imaginary part contains right samples */ |
| memcpy(s->fft_result_left, s->fft_data, fft_len * sizeof(*s->fft_data)); |
| av_fft_permute(s->fft_context, s->fft_result_left); |
| av_fft_calc(s->fft_context, s->fft_result_left); |
| |
| /* separate left and right, (and multiply by 2.0) */ |
| s->fft_result_right[0].re = 2.0f * s->fft_result_left[0].im; |
| s->fft_result_right[0].im = 0; |
| s->fft_result_left[0].re = 2.0f * s->fft_result_left[0].re; |
| s->fft_result_left[0].im = 0; |
| for (x = 1; x <= fft_len >> 1; x++) { |
| FFTSample tmpy = s->fft_result_left[fft_len-x].im - s->fft_result_left[x].im; |
| |
| s->fft_result_right[x].re = s->fft_result_left[x].im + s->fft_result_left[fft_len-x].im; |
| s->fft_result_right[x].im = s->fft_result_left[x].re - s->fft_result_left[fft_len-x].re; |
| s->fft_result_right[fft_len-x].re = s->fft_result_right[x].re; |
| s->fft_result_right[fft_len-x].im = -s->fft_result_right[x].im; |
| |
| s->fft_result_left[x].re = s->fft_result_left[x].re + s->fft_result_left[fft_len-x].re; |
| s->fft_result_left[x].im = tmpy; |
| s->fft_result_left[fft_len-x].re = s->fft_result_left[x].re; |
| s->fft_result_left[fft_len-x].im = -s->fft_result_left[x].im; |
| } |
| |
| /* calculating cqt */ |
| for (x = 0; x < VIDEO_WIDTH; x++) { |
| int u; |
| float g = 1.0f / s->gamma; |
| float g2 = 1.0f / s->gamma2; |
| FFTComplex l = {0,0}; |
| FFTComplex r = {0,0}; |
| |
| for (u = 0; u < s->coeffs_len[x]; u++) { |
| FFTSample value = s->coeffs[x][u].value; |
| int index = s->coeffs[x][u].index; |
| l.re += value * s->fft_result_left[index].re; |
| l.im += value * s->fft_result_left[index].im; |
| r.re += value * s->fft_result_right[index].re; |
| r.im += value * s->fft_result_right[index].im; |
| } |
| /* result is power, not amplitude */ |
| result[x][0] = l.re * l.re + l.im * l.im; |
| result[x][2] = r.re * r.re + r.im * r.im; |
| result[x][1] = 0.5f * (result[x][0] + result[x][2]); |
| result[x][3] = (g2 == 1.0f) ? result[x][1] : powf(result[x][1], g2); |
| result[x][0] = 255.0f * powf(FFMIN(1.0f,result[x][0]), g); |
| result[x][1] = 255.0f * powf(FFMIN(1.0f,result[x][1]), g); |
| result[x][2] = 255.0f * powf(FFMIN(1.0f,result[x][2]), g); |
| } |
| |
| if (!s->fullhd) { |
| for (x = 0; x < video_width; x++) { |
| result[x][0] = 0.5f * (result[2*x][0] + result[2*x+1][0]); |
| result[x][1] = 0.5f * (result[2*x][1] + result[2*x+1][1]); |
| result[x][2] = 0.5f * (result[2*x][2] + result[2*x+1][2]); |
| result[x][3] = 0.5f * (result[2*x][3] + result[2*x+1][3]); |
| } |
| } |
| |
| for (x = 0; x < video_width; x++) { |
| s->spectogram[s->spectogram_index*linesize + 3*x] = result[x][0] + 0.5f; |
| s->spectogram[s->spectogram_index*linesize + 3*x + 1] = result[x][1] + 0.5f; |
| s->spectogram[s->spectogram_index*linesize + 3*x + 2] = result[x][2] + 0.5f; |
| } |
| |
| /* drawing */ |
| if (!s->spectogram_count) { |
| uint8_t *data = (uint8_t*) s->outpicref->data[0]; |
| float rcp_result[VIDEO_WIDTH]; |
| int total_length = linesize * spectogram_height; |
| int back_length = linesize * s->spectogram_index; |
| |
| for (x = 0; x < video_width; x++) |
| rcp_result[x] = 1.0f / (result[x][3]+0.0001f); |
| |
| /* drawing bar */ |
| for (y = 0; y < spectogram_height; y++) { |
| float height = (spectogram_height - y) * (1.0f/spectogram_height); |
| uint8_t *lineptr = data + y * linesize; |
| for (x = 0; x < video_width; x++) { |
| float mul; |
| if (result[x][3] <= height) { |
| *lineptr++ = 0; |
| *lineptr++ = 0; |
| *lineptr++ = 0; |
| } else { |
| mul = (result[x][3] - height) * rcp_result[x]; |
| *lineptr++ = mul * result[x][0] + 0.5f; |
| *lineptr++ = mul * result[x][1] + 0.5f; |
| *lineptr++ = mul * result[x][2] + 0.5f; |
| } |
| } |
| } |
| |
| /* drawing font */ |
| if (s->font_alpha) { |
| for (y = 0; y < font_height; y++) { |
| uint8_t *lineptr = data + (spectogram_height + y) * linesize; |
| uint8_t *spectogram_src = s->spectogram + s->spectogram_index * linesize; |
| uint8_t *fontcolor_value = s->fontcolor_value; |
| for (x = 0; x < video_width; x++) { |
| uint8_t alpha = s->font_alpha[y*video_width+x]; |
| lineptr[3*x] = (spectogram_src[3*x] * (255-alpha) + fontcolor_value[0] * alpha + 255) >> 8; |
| lineptr[3*x+1] = (spectogram_src[3*x+1] * (255-alpha) + fontcolor_value[1] * alpha + 255) >> 8; |
| lineptr[3*x+2] = (spectogram_src[3*x+2] * (255-alpha) + fontcolor_value[2] * alpha + 255) >> 8; |
| fontcolor_value += 3; |
| } |
| } |
| } else { |
| for (y = 0; y < font_height; y++) { |
| uint8_t *lineptr = data + (spectogram_height + y) * linesize; |
| memcpy(lineptr, s->spectogram + s->spectogram_index * linesize, video_width*3); |
| } |
| for (x = 0; x < video_width; x += video_width/10) { |
| int u; |
| static const char str[] = "EF G A BC D "; |
| uint8_t *startptr = data + spectogram_height * linesize + x * 3; |
| for (u = 0; str[u]; u++) { |
| int v; |
| for (v = 0; v < 16; v++) { |
| uint8_t *p = startptr + v * linesize * video_scale + 8 * 3 * u * video_scale; |
| int ux = x + 8 * u * video_scale; |
| int mask; |
| for (mask = 0x80; mask; mask >>= 1) { |
| if (mask & avpriv_vga16_font[str[u] * 16 + v]) { |
| p[0] = s->fontcolor_value[3*ux]; |
| p[1] = s->fontcolor_value[3*ux+1]; |
| p[2] = s->fontcolor_value[3*ux+2]; |
| if (video_scale == 2) { |
| p[linesize] = p[0]; |
| p[linesize+1] = p[1]; |
| p[linesize+2] = p[2]; |
| p[3] = p[linesize+3] = s->fontcolor_value[3*ux+3]; |
| p[4] = p[linesize+4] = s->fontcolor_value[3*ux+4]; |
| p[5] = p[linesize+5] = s->fontcolor_value[3*ux+5]; |
| } |
| } |
| p += 3 * video_scale; |
| ux += video_scale; |
| } |
| } |
| } |
| } |
| } |
| |
| /* drawing spectogram/sonogram */ |
| data += spectogram_start * linesize; |
| memcpy(data, s->spectogram + s->spectogram_index*linesize, total_length - back_length); |
| |
| data += total_length - back_length; |
| if (back_length) |
| memcpy(data, s->spectogram, back_length); |
| |
| s->outpicref->pts = s->frame_count; |
| ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref)); |
| s->req_fullfilled = 1; |
| s->frame_count++; |
| } |
| s->spectogram_count = (s->spectogram_count + 1) % s->count; |
| s->spectogram_index = (s->spectogram_index + spectogram_height - 1) % spectogram_height; |
| return ret; |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *insamples) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| ShowCQTContext *s = ctx->priv; |
| int step = inlink->sample_rate / (s->fps * s->count); |
| int fft_len = 1 << s->fft_bits; |
| int remaining; |
| float *audio_data; |
| |
| if (!insamples) { |
| while (s->remaining_fill < (fft_len >> 1)) { |
| int ret, x; |
| memset(&s->fft_data[fft_len - s->remaining_fill], 0, sizeof(*s->fft_data) * s->remaining_fill); |
| ret = plot_cqt(inlink); |
| if (ret < 0) |
| return ret; |
| for (x = 0; x < (fft_len-step); x++) |
| s->fft_data[x] = s->fft_data[x+step]; |
| s->remaining_fill += step; |
| } |
| return AVERROR_EOF; |
| } |
| |
| remaining = insamples->nb_samples; |
| audio_data = (float*) insamples->data[0]; |
| |
| while (remaining) { |
| if (remaining >= s->remaining_fill) { |
| int i = insamples->nb_samples - remaining; |
| int j = fft_len - s->remaining_fill; |
| int m, ret; |
| for (m = 0; m < s->remaining_fill; m++) { |
| s->fft_data[j+m].re = audio_data[2*(i+m)]; |
| s->fft_data[j+m].im = audio_data[2*(i+m)+1]; |
| } |
| ret = plot_cqt(inlink); |
| if (ret < 0) { |
| av_frame_free(&insamples); |
| return ret; |
| } |
| remaining -= s->remaining_fill; |
| for (m = 0; m < fft_len-step; m++) |
| s->fft_data[m] = s->fft_data[m+step]; |
| s->remaining_fill = step; |
| } else { |
| int i = insamples->nb_samples - remaining; |
| int j = fft_len - s->remaining_fill; |
| int m; |
| for (m = 0; m < remaining; m++) { |
| s->fft_data[m+j].re = audio_data[2*(i+m)]; |
| s->fft_data[m+j].im = audio_data[2*(i+m)+1]; |
| } |
| s->remaining_fill -= remaining; |
| remaining = 0; |
| } |
| } |
| av_frame_free(&insamples); |
| return 0; |
| } |
| |
| static int request_frame(AVFilterLink *outlink) |
| { |
| ShowCQTContext *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) |
| filter_frame(inlink, NULL); |
| return ret; |
| } |
| |
| static const AVFilterPad showcqt_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .filter_frame = filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad showcqt_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_output, |
| .request_frame = request_frame, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_avf_showcqt = { |
| .name = "showcqt", |
| .description = NULL_IF_CONFIG_SMALL("Convert input audio to a CQT (Constant Q Transform) spectrum video output."), |
| .uninit = uninit, |
| .query_formats = query_formats, |
| .priv_size = sizeof(ShowCQTContext), |
| .inputs = showcqt_inputs, |
| .outputs = showcqt_outputs, |
| .priv_class = &showcqt_class, |
| }; |
