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FFmpeg/libavfilter/avf_showcqt.c
Muhammad Faiz 5b48dd75d5 avfilter/avf_showcqt: use frequency domain windowing 
faster initialization and less code
slightly different result computationally from previous
coeffclamp option is ignored

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2015-09-18 18:27:18 +02:00

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/*
* 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/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 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 *values;
int start, len;
} Coeffs;
typedef struct {
const AVClass *class;
AVFrame *outpicref;
FFTContext *fft_context;
FFTComplex *fft_data;
FFTComplex *fft_result;
uint8_t *spectogram;
Coeffs coeffs[VIDEO_WIDTH];
uint8_t *font_alpha;
char *fontfile; /* using freetype */
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 */
int draw_text;
} 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_BOOL, { .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 },
{ "text", "draw text", OFFSET(draw_text), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, 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].values);
av_freep(&s->fft_data);
av_freep(&s->fft_result);
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 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, ret;
int num_coeffs = 0;
int rate = inlink->sample_rate;
double max_len = rate * (double) s->timeclamp;
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->fft_result = av_malloc_array(fft_len + 1, sizeof(*s->fft_result));
s->fft_context = av_fft_init(s->fft_bits, 0);
if (!s->fft_data || !s->fft_result || !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
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++) {
double freq = BASE_FREQ * exp2(k * (1.0/192.0));
double flen, center, tlength, volume;
int start, end;
double expr_vars_val[] = { s->timeclamp, s->timeclamp, freq, freq, freq, 0 };
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;
}
/* direct frequency domain windowing */
flen = 8.0 * fft_len / (tlength * rate);
center = freq * fft_len / rate;
start = FFMAX(0, ceil(center - 0.5 * flen));
end = FFMIN(fft_len, floor(center + 0.5 * flen));
s->coeffs[k].len = end - start + 1;
s->coeffs[k].start = start;
num_coeffs += s->coeffs[k].len;
s->coeffs[k].values = av_malloc_array(s->coeffs[k].len, sizeof(*s->coeffs[k].values));
if (!s->coeffs[k].values) {
ret = AVERROR(ENOMEM);
goto eval_error;
}
for (x = start; x <= end; x++) {
int sign = (x & 1) ? (-1) : 1;
double u = 2.0 * M_PI * (x - center) * (1.0/flen);
/* nuttall window */
double w = 0.355768 + 0.487396 * cos(u) + 0.144232 * cos(2*u) + 0.012604 * cos(3*u);
s->coeffs[k].values[x-start] = sign * volume * (1.0/fft_len) * w;
}
}
av_expr_free(fontcolor_expr);
av_expr_free(volume_expr);
av_expr_free(tlength_expr);
av_log(ctx, AV_LOG_INFO, "fft_len=%u, num_coeffs=%u\n", 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, s->fft_data, fft_len * sizeof(*s->fft_data));
av_fft_permute(s->fft_context, s->fft_result);
av_fft_calc(s->fft_context, s->fft_result);
s->fft_result[fft_len] = s->fft_result[0];
/* calculating cqt */
for (x = 0; x < VIDEO_WIDTH; x++) {
int u;
FFTComplex v = {0,0};
FFTComplex w = {0,0};
FFTComplex l, r;
for (u = 0; u < s->coeffs[x].len; u++) {
FFTSample value = s->coeffs[x].values[u];
int index = s->coeffs[x].start + u;
v.re += value * s->fft_result[index].re;
v.im += value * s->fft_result[index].im;
w.re += value * s->fft_result[fft_len - index].re;
w.im += value * s->fft_result[fft_len - index].im;
}
/* separate left and right, (and multiply by 2.0) */
l.re = v.re + w.re;
l.im = v.im - w.im;
r.re = w.im + v.im;
r.im = w.re - v.re;
/* 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]);
if (s->gamma2 == 1.0f)
result[x][3] = result[x][1];
else if (s->gamma2 == 2.0f)
result[x][3] = sqrtf(result[x][1]);
else if (s->gamma2 == 3.0f)
result[x][3] = cbrtf(result[x][1]);
else if (s->gamma2 == 4.0f)
result[x][3] = sqrtf(sqrtf(result[x][1]));
else
result[x][3] = expf(logf(result[x][1]) * (1.0f / s->gamma2));
result[x][0] = FFMIN(1.0f, result[x][0]);
result[x][1] = FFMIN(1.0f, result[x][1]);
result[x][2] = FFMIN(1.0f, result[x][2]);
if (s->gamma == 1.0f) {
result[x][0] = 255.0f * result[x][0];
result[x][1] = 255.0f * result[x][1];
result[x][2] = 255.0f * result[x][2];
} else if (s->gamma == 2.0f) {
result[x][0] = 255.0f * sqrtf(result[x][0]);
result[x][1] = 255.0f * sqrtf(result[x][1]);
result[x][2] = 255.0f * sqrtf(result[x][2]);
} else if (s->gamma == 3.0f) {
result[x][0] = 255.0f * cbrtf(result[x][0]);
result[x][1] = 255.0f * cbrtf(result[x][1]);
result[x][2] = 255.0f * cbrtf(result[x][2]);
} else if (s->gamma == 4.0f) {
result[x][0] = 255.0f * sqrtf(sqrtf(result[x][0]));
result[x][1] = 255.0f * sqrtf(sqrtf(result[x][1]));
result[x][2] = 255.0f * sqrtf(sqrtf(result[x][2]));
} else {
result[x][0] = 255.0f * expf(logf(result[x][0]) * (1.0f / s->gamma));
result[x][1] = 255.0f * expf(logf(result[x][1]) * (1.0f / s->gamma));
result[x][2] = 255.0f * expf(logf(result[x][2]) * (1.0f / s->gamma));
}
}
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 && s->draw_text) {
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 if (s->draw_text) {
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;
}
}
}
}
} else {
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;
for (x = 0; x < video_width; x++) {
lineptr[3*x] = spectogram_src[3*x];
lineptr[3*x+1] = spectogram_src[3*x+1];
lineptr[3*x+2] = spectogram_src[3*x+2];
}
}
}
/* 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,
};
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