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8507b98c10
FFmpeg/libavfilter/avf_showcqt.c
Ganesh Ajjanagadde 8507b98c10 avfilter,swresample,swscale: use fabs, fabsf instead of FFABS 
It is well known that fabs and fabsf are at least as fast and sometimes
faster than the FFABS macro, at least on the gcc+glibc combination.
For instance, see the reference:
http://patchwork.sourceware.org/patch/6735/.
This was a patch to glibc in order to remove their usages of a macro.

The reason essentially boils down to fabs using the __builtin_fabs of
the compiler, while FFABS needs to infer to not use a branch and to
simply change the sign bit. Usually the inference works, but sometimes
it does not. This may be easily checked by looking at the asm.

This also has the added benefit of reducing macro usage, which has
problems with side-effects.

Note that avcodec is not handled here, as it is huge and
most things there are integer arithmetic anyway.

Tested with FATE.

Reviewed-by: Clément Bœsch <u@pkh.me>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
2015-10-22 16:13:26 -04:00

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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 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 };
int ret;
/* set input audio formats */
formats = ff_make_format_list(sample_fmts);
if ((ret = ff_formats_ref(formats, &inlink->out_formats)) < 0)
return ret;
layouts = avfilter_make_format64_list(channel_layouts);
if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)
return ret;
formats = ff_make_format_list(samplerates);
if ((ret = ff_formats_ref(formats, &inlink->out_samplerates)) < 0)
return ret;
/* set output video format */
formats = ff_make_format_list(pix_fmts);
if ((ret = ff_formats_ref(formats, &outlink->in_formats)) < 0)
return ret;
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 = fabs(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->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->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;
ret = ff_request_frame(inlink);
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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