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avf_showspectrum.c
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/*
* Copyright (c) 2012-2013 Clément Bœsch
* Copyright (c) 2013 Rudolf Polzer <[email protected]>
* Copyright (c) 2015 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* audio to spectrum (video) transmedia filter, based on ffplay rdft showmode
* (by Michael Niedermayer) and lavfi/avf_showwaves (by Stefano Sabatini).
*/
#include <math.h>
#include "libavcodec/avfft.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavutil/xga_font_data.h"
#include "audio.h"
#include "video.h"
#include "avfilter.h"
#include "internal.h"
#include "window_func.h"
enum DisplayMode { COMBINED, SEPARATE, NB_MODES };
enum DataMode { D_MAGNITUDE, D_PHASE, NB_DMODES };
enum DisplayScale { LINEAR, SQRT, CBRT, LOG, FOURTHRT, FIFTHRT, NB_SCALES };
enum ColorMode { CHANNEL, INTENSITY, RAINBOW, MORELAND, NEBULAE, FIRE, FIERY, FRUIT, COOL, NB_CLMODES };
enum SlideMode { REPLACE, SCROLL, FULLFRAME, RSCROLL, NB_SLIDES };
enum Orientation { VERTICAL, HORIZONTAL, NB_ORIENTATIONS };
typedef struct {
const AVClass *class;
int w, h;
AVFrame *outpicref;
int nb_display_channels;
int orientation;
int channel_width;
int channel_height;
int sliding; ///< 1 if sliding mode, 0 otherwise
int mode; ///< channel display mode
int color_mode; ///< display color scheme
int scale;
float saturation; ///< color saturation multiplier
float rotation; ///< color rotation
int data;
int xpos; ///< x position (current column)
FFTContext **fft; ///< Fast Fourier Transform context
int fft_bits; ///< number of bits (FFT window size = 1<<fft_bits)
FFTComplex **fft_data; ///< bins holder for each (displayed) channels
float *window_func_lut; ///< Window function LUT
float **magnitudes;
float **phases;
int win_func;
int win_size;
double win_scale;
float overlap;
float gain;
int hop_size;
float *combine_buffer; ///< color combining buffer (3 * h items)
float **color_buffer; ///< color buffer (3 * h * ch items)
AVAudioFifo *fifo;
int64_t pts;
int single_pic;
int legend;
int start_x, start_y;
} ShowSpectrumContext;
#define OFFSET(x) offsetof(ShowSpectrumContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption showspectrum_options[] = {
{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x512"}, 0, 0, FLAGS },
{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "640x512"}, 0, 0, FLAGS },
{ "slide", "set sliding mode", OFFSET(sliding), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NB_SLIDES-1, FLAGS, "slide" },
{ "replace", "replace old columns with new", 0, AV_OPT_TYPE_CONST, {.i64=REPLACE}, 0, 0, FLAGS, "slide" },
{ "scroll", "scroll from right to left", 0, AV_OPT_TYPE_CONST, {.i64=SCROLL}, 0, 0, FLAGS, "slide" },
{ "fullframe", "return full frames", 0, AV_OPT_TYPE_CONST, {.i64=FULLFRAME}, 0, 0, FLAGS, "slide" },
{ "rscroll", "scroll from left to right", 0, AV_OPT_TYPE_CONST, {.i64=RSCROLL}, 0, 0, FLAGS, "slide" },
{ "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, COMBINED, NB_MODES-1, FLAGS, "mode" },
{ "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" },
{ "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" },
{ "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=CHANNEL}, CHANNEL, NB_CLMODES-1, FLAGS, "color" },
{ "channel", "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL}, 0, 0, FLAGS, "color" },
{ "intensity", "intensity based coloring", 0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" },
{ "rainbow", "rainbow based coloring", 0, AV_OPT_TYPE_CONST, {.i64=RAINBOW}, 0, 0, FLAGS, "color" },
{ "moreland", "moreland based coloring", 0, AV_OPT_TYPE_CONST, {.i64=MORELAND}, 0, 0, FLAGS, "color" },
{ "nebulae", "nebulae based coloring", 0, AV_OPT_TYPE_CONST, {.i64=NEBULAE}, 0, 0, FLAGS, "color" },
{ "fire", "fire based coloring", 0, AV_OPT_TYPE_CONST, {.i64=FIRE}, 0, 0, FLAGS, "color" },
{ "fiery", "fiery based coloring", 0, AV_OPT_TYPE_CONST, {.i64=FIERY}, 0, 0, FLAGS, "color" },
{ "fruit", "fruit based coloring", 0, AV_OPT_TYPE_CONST, {.i64=FRUIT}, 0, 0, FLAGS, "color" },
{ "cool", "cool based coloring", 0, AV_OPT_TYPE_CONST, {.i64=COOL}, 0, 0, FLAGS, "color" },
{ "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=SQRT}, LINEAR, NB_SCALES-1, FLAGS, "scale" },
{ "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },
{ "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT}, 0, 0, FLAGS, "scale" },
{ "cbrt", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64=CBRT}, 0, 0, FLAGS, "scale" },
{ "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, FLAGS, "scale" },
{ "4thrt","4th root", 0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },
{ "5thrt","5th root", 0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT}, 0, 0, FLAGS, "scale" },
{ "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },
{ "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },
{ "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" },
{ "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },
{ "hann", "Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
{ "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
{ "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" },
{ "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
{ "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" },
{ "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" },
{ "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" },
{ "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },
{ "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" },
{ "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" },
{ "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" },
{ "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, FLAGS, "win_func" },
{ "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, FLAGS, "win_func" },
{ "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" },
{ "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" },
{ "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, FLAGS, "win_func" },
{ "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, FLAGS, "win_func" },
{ "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, FLAGS, "win_func" },
{ "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },
{ "vertical", NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL}, 0, 0, FLAGS, "orientation" },
{ "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },
{ "overlap", "set window overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl = 0}, 0, 1, FLAGS },
{ "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },
{ "data", "set data mode", OFFSET(data), AV_OPT_TYPE_INT, {.i64 = 0}, 0, NB_DMODES-1, FLAGS, "data" },
{ "magnitude", NULL, 0, AV_OPT_TYPE_CONST, {.i64=D_MAGNITUDE}, 0, 0, FLAGS, "data" },
{ "phase", NULL, 0, AV_OPT_TYPE_CONST, {.i64=D_PHASE}, 0, 0, FLAGS, "data" },
{ "rotation", "color rotation", OFFSET(rotation), AV_OPT_TYPE_FLOAT, {.dbl = 0}, -1, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(showspectrum);
static const struct ColorTable {
float a, y, u, v;
} color_table[][8] = {
[INTENSITY] = {
{ 0, 0, 0, 0 },
{ 0.13, .03587126228984074, .1573300977624594, -.02548747583751842 },
{ 0.30, .18572281794568020, .1772436246393981, .17475554840414750 },
{ 0.60, .28184980583656130, -.1593064119945782, .47132074554608920 },
{ 0.73, .65830621175547810, -.3716070802232764, .24352759331252930 },
{ 0.78, .76318535758242900, -.4307467689263783, .16866496622310430 },
{ 0.91, .95336363636363640, -.2045454545454546, .03313636363636363 },
{ 1, 1, 0, 0 }},
[RAINBOW] = {
{ 0, 0, 0, 0 },
{ 0.13, 44/256., (189-128)/256., (138-128)/256. },
{ 0.25, 29/256., (186-128)/256., (119-128)/256. },
{ 0.38, 119/256., (194-128)/256., (53-128)/256. },
{ 0.60, 111/256., (73-128)/256., (59-128)/256. },
{ 0.73, 205/256., (19-128)/256., (149-128)/256. },
{ 0.86, 135/256., (83-128)/256., (200-128)/256. },
{ 1, 73/256., (95-128)/256., (225-128)/256. }},
[MORELAND] = {
{ 0, 44/256., (181-128)/256., (112-128)/256. },
{ 0.13, 126/256., (177-128)/256., (106-128)/256. },
{ 0.25, 164/256., (163-128)/256., (109-128)/256. },
{ 0.38, 200/256., (140-128)/256., (120-128)/256. },
{ 0.60, 201/256., (117-128)/256., (141-128)/256. },
{ 0.73, 177/256., (103-128)/256., (165-128)/256. },
{ 0.86, 136/256., (100-128)/256., (183-128)/256. },
{ 1, 68/256., (117-128)/256., (203-128)/256. }},
[NEBULAE] = {
{ 0, 10/256., (134-128)/256., (132-128)/256. },
{ 0.23, 21/256., (137-128)/256., (130-128)/256. },
{ 0.45, 35/256., (134-128)/256., (134-128)/256. },
{ 0.57, 51/256., (130-128)/256., (139-128)/256. },
{ 0.67, 104/256., (116-128)/256., (162-128)/256. },
{ 0.77, 120/256., (105-128)/256., (188-128)/256. },
{ 0.87, 140/256., (105-128)/256., (188-128)/256. },
{ 1, 1, 0, 0 }},
[FIRE] = {
{ 0, 0, 0, 0 },
{ 0.23, 44/256., (132-128)/256., (127-128)/256. },
{ 0.45, 62/256., (116-128)/256., (140-128)/256. },
{ 0.57, 75/256., (105-128)/256., (152-128)/256. },
{ 0.67, 95/256., (91-128)/256., (166-128)/256. },
{ 0.77, 126/256., (74-128)/256., (172-128)/256. },
{ 0.87, 164/256., (73-128)/256., (162-128)/256. },
{ 1, 1, 0, 0 }},
[FIERY] = {
{ 0, 0, 0, 0 },
{ 0.23, 36/256., (116-128)/256., (163-128)/256. },
{ 0.45, 52/256., (102-128)/256., (200-128)/256. },
{ 0.57, 116/256., (84-128)/256., (196-128)/256. },
{ 0.67, 157/256., (67-128)/256., (181-128)/256. },
{ 0.77, 193/256., (40-128)/256., (155-128)/256. },
{ 0.87, 221/256., (101-128)/256., (134-128)/256. },
{ 1, 1, 0, 0 }},
[FRUIT] = {
{ 0, 0, 0, 0 },
{ 0.20, 29/256., (136-128)/256., (119-128)/256. },
{ 0.30, 60/256., (119-128)/256., (90-128)/256. },
{ 0.40, 85/256., (91-128)/256., (85-128)/256. },
{ 0.50, 116/256., (70-128)/256., (105-128)/256. },
{ 0.60, 151/256., (50-128)/256., (146-128)/256. },
{ 0.70, 191/256., (63-128)/256., (178-128)/256. },
{ 1, 98/256., (80-128)/256., (221-128)/256. }},
[COOL] = {
{ 0, 0, 0, 0 },
{ .15, 0, .5, -.5 },
{ 1, 1, -.5, .5 }},
};
static av_cold void uninit(AVFilterContext *ctx)
{
ShowSpectrumContext *s = ctx->priv;
int i;
av_freep(&s->combine_buffer);
if (s->fft) {
for (i = 0; i < s->nb_display_channels; i++)
av_fft_end(s->fft[i]);
}
av_freep(&s->fft);
if (s->fft_data) {
for (i = 0; i < s->nb_display_channels; i++)
av_freep(&s->fft_data[i]);
}
av_freep(&s->fft_data);
if (s->color_buffer) {
for (i = 0; i < s->nb_display_channels; i++)
av_freep(&s->color_buffer[i]);
}
av_freep(&s->color_buffer);
av_freep(&s->window_func_lut);
if (s->magnitudes) {
for (i = 0; i < s->nb_display_channels; i++)
av_freep(&s->magnitudes[i]);
}
av_freep(&s->magnitudes);
av_frame_free(&s->outpicref);
av_audio_fifo_free(s->fifo);
if (s->phases) {
for (i = 0; i < s->nb_display_channels; i++)
av_freep(&s->phases[i]);
}
av_freep(&s->phases);
}
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_FLTP, AV_SAMPLE_FMT_NONE };
static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE };
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 = ff_all_channel_layouts();
if ((ret = ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts)) < 0)
return ret;
formats = ff_all_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;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
ShowSpectrumContext *s = ctx->priv;
int i, fft_bits, h, w;
float overlap;
if (!strcmp(ctx->filter->name, "showspectrumpic"))
s->single_pic = 1;
outlink->w = s->w;
outlink->h = s->h;
if (s->legend) {
s->start_x = log10(inlink->sample_rate) * 25;
s->start_y = 64;
outlink->w += s->start_x * 2;
outlink->h += s->start_y * 2;
}
h = (s->mode == COMBINED || s->orientation == HORIZONTAL) ? s->h : s->h / inlink->channels;
w = (s->mode == COMBINED || s->orientation == VERTICAL) ? s->w : s->w / inlink->channels;
s->channel_height = h;
s->channel_width = w;
if (s->orientation == VERTICAL) {
/* FFT window size (precision) according to the requested output frame height */
for (fft_bits = 1; 1 << fft_bits < 2 * h; fft_bits++);
} else {
/* FFT window size (precision) according to the requested output frame width */
for (fft_bits = 1; 1 << fft_bits < 2 * w; fft_bits++);
}
s->win_size = 1 << fft_bits;
if (!s->fft) {
s->fft = av_calloc(inlink->channels, sizeof(*s->fft));
if (!s->fft)
return AVERROR(ENOMEM);
}
/* (re-)configuration if the video output changed (or first init) */
if (fft_bits != s->fft_bits) {
AVFrame *outpicref;
s->fft_bits = fft_bits;
/* FFT buffers: x2 for each (display) channel buffer.
* Note: we use free and malloc instead of a realloc-like function to
* make sure the buffer is aligned in memory for the FFT functions. */
for (i = 0; i < s->nb_display_channels; i++) {
av_fft_end(s->fft[i]);
av_freep(&s->fft_data[i]);
}
av_freep(&s->fft_data);
s->nb_display_channels = inlink->channels;
for (i = 0; i < s->nb_display_channels; i++) {
s->fft[i] = av_fft_init(fft_bits, 0);
if (!s->fft[i]) {
av_log(ctx, AV_LOG_ERROR, "Unable to create FFT context. "
"The window size might be too high.\n");
return AVERROR(EINVAL);
}
}
s->magnitudes = av_calloc(s->nb_display_channels, sizeof(*s->magnitudes));
if (!s->magnitudes)
return AVERROR(ENOMEM);
for (i = 0; i < s->nb_display_channels; i++) {
s->magnitudes[i] = av_calloc(s->orientation == VERTICAL ? s->h : s->w, sizeof(**s->magnitudes));
if (!s->magnitudes[i])
return AVERROR(ENOMEM);
}
s->phases = av_calloc(s->nb_display_channels, sizeof(*s->phases));
if (!s->phases)
return AVERROR(ENOMEM);
for (i = 0; i < s->nb_display_channels; i++) {
s->phases[i] = av_calloc(s->orientation == VERTICAL ? s->h : s->w, sizeof(**s->phases));
if (!s->phases[i])
return AVERROR(ENOMEM);
}
av_freep(&s->color_buffer);
s->color_buffer = av_calloc(s->nb_display_channels, sizeof(*s->color_buffer));
if (!s->color_buffer)
return AVERROR(ENOMEM);
for (i = 0; i < s->nb_display_channels; i++) {
s->color_buffer[i] = av_calloc(s->orientation == VERTICAL ? s->h * 3 : s->w * 3, sizeof(**s->color_buffer));
if (!s->color_buffer[i])
return AVERROR(ENOMEM);
}
s->fft_data = av_calloc(s->nb_display_channels, sizeof(*s->fft_data));
if (!s->fft_data)
return AVERROR(ENOMEM);
for (i = 0; i < s->nb_display_channels; i++) {
s->fft_data[i] = av_calloc(s->win_size, sizeof(**s->fft_data));
if (!s->fft_data[i])
return AVERROR(ENOMEM);
}
/* pre-calc windowing function */
s->window_func_lut =
av_realloc_f(s->window_func_lut, s->win_size,
sizeof(*s->window_func_lut));
if (!s->window_func_lut)
return AVERROR(ENOMEM);
ff_generate_window_func(s->window_func_lut, s->win_size, s->win_func, &overlap);
if (s->overlap == 1)
s->overlap = overlap;
s->hop_size = (1. - s->overlap) * s->win_size;
if (s->hop_size < 1) {
av_log(ctx, AV_LOG_ERROR, "overlap %f too big\n", s->overlap);
return AVERROR(EINVAL);
}
for (s->win_scale = 0, i = 0; i < s->win_size; i++) {
s->win_scale += s->window_func_lut[i] * s->window_func_lut[i];
}
s->win_scale = 1. / sqrt(s->win_scale);
/* prepare the initial picref buffer (black frame) */
av_frame_free(&s->outpicref);
s->outpicref = outpicref =
ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!outpicref)
return AVERROR(ENOMEM);
outlink->sample_aspect_ratio = (AVRational){1,1};
for (i = 0; i < outlink->h; i++) {
memset(outpicref->data[0] + i * outpicref->linesize[0], 0, outlink->w);
memset(outpicref->data[1] + i * outpicref->linesize[1], 128, outlink->w);
memset(outpicref->data[2] + i * outpicref->linesize[2], 128, outlink->w);
}
outpicref->color_range = AVCOL_RANGE_JPEG;
}
if ((s->orientation == VERTICAL && s->xpos >= s->w) ||
(s->orientation == HORIZONTAL && s->xpos >= s->h))
s->xpos = 0;
outlink->frame_rate = av_make_q(inlink->sample_rate, s->win_size * (1.-s->overlap));
if (s->orientation == VERTICAL && s->sliding == FULLFRAME)
outlink->frame_rate.den *= s->w;
if (s->orientation == HORIZONTAL && s->sliding == FULLFRAME)
outlink->frame_rate.den *= s->h;
if (s->orientation == VERTICAL) {
s->combine_buffer =
av_realloc_f(s->combine_buffer, s->h * 3,
sizeof(*s->combine_buffer));
} else {
s->combine_buffer =
av_realloc_f(s->combine_buffer, s->w * 3,
sizeof(*s->combine_buffer));
}
av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d FFT window size:%d\n",
s->w, s->h, s->win_size);
av_audio_fifo_free(s->fifo);
s->fifo = av_audio_fifo_alloc(inlink->format, inlink->channels, s->win_size);
if (!s->fifo)
return AVERROR(ENOMEM);
return 0;
}
static int run_channel_fft(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ShowSpectrumContext *s = ctx->priv;
const float *window_func_lut = s->window_func_lut;
AVFrame *fin = arg;
const int ch = jobnr;
int n;
/* fill FFT input with the number of samples available */
const float *p = (float *)fin->extended_data[ch];
for (n = 0; n < s->win_size; n++) {
s->fft_data[ch][n].re = p[n] * window_func_lut[n];
s->fft_data[ch][n].im = 0;
}
/* run FFT on each samples set */
av_fft_permute(s->fft[ch], s->fft_data[ch]);
av_fft_calc(s->fft[ch], s->fft_data[ch]);
return 0;
}
#define RE(y, ch) s->fft_data[ch][y].re
#define IM(y, ch) s->fft_data[ch][y].im
#define MAGNITUDE(y, ch) hypot(RE(y, ch), IM(y, ch))
#define PHASE(y, ch) atan2(IM(y, ch), RE(y, ch))
static int calc_channel_magnitudes(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ShowSpectrumContext *s = ctx->priv;
const double w = s->win_scale * (s->scale == LOG ? s->win_scale : 1);
int y, h = s->orientation == VERTICAL ? s->h : s->w;
const float f = s->gain * w;
const int ch = jobnr;
float *magnitudes = s->magnitudes[ch];
for (y = 0; y < h; y++)
magnitudes[y] = MAGNITUDE(y, ch) * f;
return 0;
}
static int calc_channel_phases(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ShowSpectrumContext *s = ctx->priv;
const int h = s->orientation == VERTICAL ? s->h : s->w;
const int ch = jobnr;
float *phases = s->phases[ch];
int y;
for (y = 0; y < h; y++)
phases[y] = (PHASE(y, ch) / M_PI + 1) / 2;
return 0;
}
static void acalc_magnitudes(ShowSpectrumContext *s)
{
const double w = s->win_scale * (s->scale == LOG ? s->win_scale : 1);
int ch, y, h = s->orientation == VERTICAL ? s->h : s->w;
const float f = s->gain * w;
for (ch = 0; ch < s->nb_display_channels; ch++) {
float *magnitudes = s->magnitudes[ch];
for (y = 0; y < h; y++)
magnitudes[y] += MAGNITUDE(y, ch) * f;
}
}
static void scale_magnitudes(ShowSpectrumContext *s, float scale)
{
int ch, y, h = s->orientation == VERTICAL ? s->h : s->w;
for (ch = 0; ch < s->nb_display_channels; ch++) {
float *magnitudes = s->magnitudes[ch];
for (y = 0; y < h; y++)
magnitudes[y] *= scale;
}
}
static void color_range(ShowSpectrumContext *s, int ch,
float *yf, float *uf, float *vf)
{
switch (s->mode) {
case COMBINED:
// reduce range by channel count
*yf = 256.0f / s->nb_display_channels;
switch (s->color_mode) {
case RAINBOW:
case MORELAND:
case NEBULAE:
case FIRE:
case FIERY:
case FRUIT:
case COOL:
case INTENSITY:
*uf = *yf;
*vf = *yf;
break;
case CHANNEL:
/* adjust saturation for mixed UV coloring */
/* this factor is correct for infinite channels, an approximation otherwise */
*uf = *yf * M_PI;
*vf = *yf * M_PI;
break;
default:
av_assert0(0);
}
break;
case SEPARATE:
// full range
*yf = 256.0f;
*uf = 256.0f;
*vf = 256.0f;
break;
default:
av_assert0(0);
}
if (s->color_mode == CHANNEL) {
if (s->nb_display_channels > 1) {
*uf *= 0.5 * sin((2 * M_PI * ch) / s->nb_display_channels + M_PI * s->rotation);
*vf *= 0.5 * cos((2 * M_PI * ch) / s->nb_display_channels + M_PI * s->rotation);
} else {
*uf *= 0.5 * sin(M_PI * s->rotation);
*vf *= 0.5 * cos(M_PI * s->rotation + M_PI_2);
}
} else {
*uf += *uf * sin(M_PI * s->rotation);
*vf += *vf * cos(M_PI * s->rotation + M_PI_2);
}
*uf *= s->saturation;
*vf *= s->saturation;
}
static void pick_color(ShowSpectrumContext *s,
float yf, float uf, float vf,
float a, float *out)
{
if (s->color_mode > CHANNEL) {
const int cm = s->color_mode;
float y, u, v;
int i;
for (i = 1; i < FF_ARRAY_ELEMS(color_table[cm]) - 1; i++)
if (color_table[cm][i].a >= a)
break;
// i now is the first item >= the color
// now we know to interpolate between item i - 1 and i
if (a <= color_table[cm][i - 1].a) {
y = color_table[cm][i - 1].y;
u = color_table[cm][i - 1].u;
v = color_table[cm][i - 1].v;
} else if (a >= color_table[cm][i].a) {
y = color_table[cm][i].y;
u = color_table[cm][i].u;
v = color_table[cm][i].v;
} else {
float start = color_table[cm][i - 1].a;
float end = color_table[cm][i].a;
float lerpfrac = (a - start) / (end - start);
y = color_table[cm][i - 1].y * (1.0f - lerpfrac)
+ color_table[cm][i].y * lerpfrac;
u = color_table[cm][i - 1].u * (1.0f - lerpfrac)
+ color_table[cm][i].u * lerpfrac;
v = color_table[cm][i - 1].v * (1.0f - lerpfrac)
+ color_table[cm][i].v * lerpfrac;
}
out[0] = y * yf;
out[1] = u * uf;
out[2] = v * vf;
} else {
out[0] = a * yf;
out[1] = a * uf;
out[2] = a * vf;
}
}
static void clear_combine_buffer(ShowSpectrumContext *s, int size)
{
int y;
for (y = 0; y < size; y++) {
s->combine_buffer[3 * y ] = 0;
s->combine_buffer[3 * y + 1] = 127.5;
s->combine_buffer[3 * y + 2] = 127.5;
}
}
static int plot_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ShowSpectrumContext *s = ctx->priv;
const int h = s->orientation == VERTICAL ? s->channel_height : s->channel_width;
const int ch = jobnr;
float *magnitudes = s->magnitudes[ch];
float *phases = s->phases[ch];
float yf, uf, vf;
int y;
/* decide color range */
color_range(s, ch, &yf, &uf, &vf);
/* draw the channel */
for (y = 0; y < h; y++) {
int row = (s->mode == COMBINED) ? y : ch * h + y;
float *out = &s->color_buffer[ch][3 * row];
float a;
switch (s->data) {
case D_MAGNITUDE:
/* get magnitude */
a = magnitudes[y];
break;
case D_PHASE:
/* get phase */
a = phases[y];
break;
default:
av_assert0(0);
}
/* apply scale */
switch (s->scale) {
case LINEAR:
a = av_clipf(a, 0, 1);
break;
case SQRT:
a = av_clipf(sqrt(a), 0, 1);
break;
case CBRT:
a = av_clipf(cbrt(a), 0, 1);
break;
case FOURTHRT:
a = av_clipf(sqrt(sqrt(a)), 0, 1);
break;
case FIFTHRT:
a = av_clipf(pow(a, 0.20), 0, 1);
break;
case LOG:
a = 1 + log10(av_clipd(a, 1e-6, 1)) / 6; // zero = -120dBFS
break;
default:
av_assert0(0);
}
pick_color(s, yf, uf, vf, a, out);
}
return 0;
}
static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
ShowSpectrumContext *s = ctx->priv;
AVFrame *outpicref = s->outpicref;
int ret, plane, x, y, z = s->orientation == VERTICAL ? s->h : s->w;
/* fill a new spectrum column */
/* initialize buffer for combining to black */
clear_combine_buffer(s, z);
ctx->internal->execute(ctx, plot_channel, NULL, NULL, s->nb_display_channels);
for (y = 0; y < z * 3; y++) {
for (x = 0; x < s->nb_display_channels; x++) {
s->combine_buffer[y] += s->color_buffer[x][y];
}
}
av_frame_make_writable(s->outpicref);
/* copy to output */
if (s->orientation == VERTICAL) {
if (s->sliding == SCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = 0; y < s->h; y++) {
uint8_t *p = outpicref->data[plane] +
y * outpicref->linesize[plane];
memmove(p, p + 1, s->w - 1);
}
}
s->xpos = s->w - 1;
} else if (s->sliding == RSCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = 0; y < s->h; y++) {
uint8_t *p = outpicref->data[plane] +
y * outpicref->linesize[plane];
memmove(p + 1, p, s->w - 1);
}
}
s->xpos = 0;
}
for (plane = 0; plane < 3; plane++) {
uint8_t *p = outpicref->data[plane] + s->start_x +
(outlink->h - 1 - s->start_y) * outpicref->linesize[plane] +
s->xpos;
for (y = 0; y < s->h; y++) {
*p = lrintf(av_clipf(s->combine_buffer[3 * y + plane], 0, 255));
p -= outpicref->linesize[plane];
}
}
} else {
if (s->sliding == SCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = 1; y < s->h; y++) {
memmove(outpicref->data[plane] + (y-1) * outpicref->linesize[plane],
outpicref->data[plane] + (y ) * outpicref->linesize[plane],
s->w);
}
}
s->xpos = s->h - 1;
} else if (s->sliding == RSCROLL) {
for (plane = 0; plane < 3; plane++) {
for (y = s->h - 1; y >= 1; y--) {
memmove(outpicref->data[plane] + (y ) * outpicref->linesize[plane],
outpicref->data[plane] + (y-1) * outpicref->linesize[plane],
s->w);
}
}
s->xpos = 0;
}
for (plane = 0; plane < 3; plane++) {
uint8_t *p = outpicref->data[plane] + s->start_x +
(s->xpos + s->start_y) * outpicref->linesize[plane];
for (x = 0; x < s->w; x++) {
*p = lrintf(av_clipf(s->combine_buffer[3 * x + plane], 0, 255));
p++;
}
}
}
if (s->sliding != FULLFRAME || s->xpos == 0)
outpicref->pts = insamples->pts;
s->xpos++;
if (s->orientation == VERTICAL && s->xpos >= s->w)
s->xpos = 0;
if (s->orientation == HORIZONTAL && s->xpos >= s->h)
s->xpos = 0;
if (!s->single_pic && (s->sliding != FULLFRAME || s->xpos == 0)) {
ret = ff_filter_frame(outlink, av_frame_clone(s->outpicref));
if (ret < 0)
return ret;
}
return s->win_size;
}
#if CONFIG_SHOWSPECTRUM_FILTER
static int request_frame(AVFilterLink *outlink)
{
ShowSpectrumContext *s = outlink->src->priv;
AVFilterLink *inlink = outlink->src->inputs[0];
unsigned i;
int ret;
ret = ff_request_frame(inlink);
if (ret == AVERROR_EOF && s->sliding == FULLFRAME && s->xpos > 0 &&
s->outpicref) {
if (s->orientation == VERTICAL) {
for (i = 0; i < outlink->h; i++) {
memset(s->outpicref->data[0] + i * s->outpicref->linesize[0] + s->xpos, 0, outlink->w - s->xpos);
memset(s->outpicref->data[1] + i * s->outpicref->linesize[1] + s->xpos, 128, outlink->w - s->xpos);
memset(s->outpicref->data[2] + i * s->outpicref->linesize[2] + s->xpos, 128, outlink->w - s->xpos);
}
} else {
for (i = s->xpos; i < outlink->h; i++) {
memset(s->outpicref->data[0] + i * s->outpicref->linesize[0], 0, outlink->w);
memset(s->outpicref->data[1] + i * s->outpicref->linesize[1], 128, outlink->w);
memset(s->outpicref->data[2] + i * s->outpicref->linesize[2], 128, outlink->w);
}
}
ret = ff_filter_frame(outlink, s->outpicref);
s->outpicref = NULL;
}
return ret;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
{
AVFilterContext *ctx = inlink->dst;
ShowSpectrumContext *s = ctx->priv;
AVFrame *fin = NULL;
int ret = 0, consumed = 0;
if (s->pts == AV_NOPTS_VALUE)
s->pts = insamples->pts - av_audio_fifo_size(s->fifo);
av_audio_fifo_write(s->fifo, (void **)insamples->extended_data, insamples->nb_samples);
av_frame_free(&insamples);
while (av_audio_fifo_size(s->fifo) >= s->win_size) {
fin = ff_get_audio_buffer(inlink, s->win_size);
if (!fin) {
ret = AVERROR(ENOMEM);
goto fail;
}
fin->pts = s->pts + consumed;
consumed += s->hop_size;
ret = av_audio_fifo_peek(s->fifo, (void **)fin->extended_data, s->win_size);
if (ret < 0)
goto fail;
av_assert0(fin->nb_samples == s->win_size);
ctx->internal->execute(ctx, run_channel_fft, fin, NULL, s->nb_display_channels);
if (s->data == D_MAGNITUDE)
ctx->internal->execute(ctx, calc_channel_magnitudes, NULL, NULL, s->nb_display_channels);
if (s->data == D_PHASE)
ctx->internal->execute(ctx, calc_channel_phases, NULL, NULL, s->nb_display_channels);
ret = plot_spectrum_column(inlink, fin);
av_frame_free(&fin);
av_audio_fifo_drain(s->fifo, s->hop_size);
if (ret < 0)
goto fail;
}
fail:
s->pts = AV_NOPTS_VALUE;
av_frame_free(&fin);
return ret;
}
static const AVFilterPad showspectrum_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad showspectrum_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
.request_frame = request_frame,
},
{ NULL }
};
AVFilter ff_avf_showspectrum = {
.name = "showspectrum",
.description = NULL_IF_CONFIG_SMALL("Convert input audio to a spectrum video output."),
.uninit = uninit,
.query_formats = query_formats,
.priv_size = sizeof(ShowSpectrumContext),
.inputs = showspectrum_inputs,
.outputs = showspectrum_outputs,
.priv_class = &showspectrum_class,
.flags = AVFILTER_FLAG_SLICE_THREADS,
};
#endif // CONFIG_SHOWSPECTRUM_FILTER
#if CONFIG_SHOWSPECTRUMPIC_FILTER
static const AVOption showspectrumpic_options[] = {
{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },
{ "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "4096x2048"}, 0, 0, FLAGS },
{ "mode", "set channel display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=COMBINED}, 0, NB_MODES-1, FLAGS, "mode" },
{ "combined", "combined mode", 0, AV_OPT_TYPE_CONST, {.i64=COMBINED}, 0, 0, FLAGS, "mode" },
{ "separate", "separate mode", 0, AV_OPT_TYPE_CONST, {.i64=SEPARATE}, 0, 0, FLAGS, "mode" },
{ "color", "set channel coloring", OFFSET(color_mode), AV_OPT_TYPE_INT, {.i64=INTENSITY}, 0, NB_CLMODES-1, FLAGS, "color" },
{ "channel", "separate color for each channel", 0, AV_OPT_TYPE_CONST, {.i64=CHANNEL}, 0, 0, FLAGS, "color" },
{ "intensity", "intensity based coloring", 0, AV_OPT_TYPE_CONST, {.i64=INTENSITY}, 0, 0, FLAGS, "color" },
{ "rainbow", "rainbow based coloring", 0, AV_OPT_TYPE_CONST, {.i64=RAINBOW}, 0, 0, FLAGS, "color" },
{ "moreland", "moreland based coloring", 0, AV_OPT_TYPE_CONST, {.i64=MORELAND}, 0, 0, FLAGS, "color" },
{ "nebulae", "nebulae based coloring", 0, AV_OPT_TYPE_CONST, {.i64=NEBULAE}, 0, 0, FLAGS, "color" },
{ "fire", "fire based coloring", 0, AV_OPT_TYPE_CONST, {.i64=FIRE}, 0, 0, FLAGS, "color" },
{ "fiery", "fiery based coloring", 0, AV_OPT_TYPE_CONST, {.i64=FIERY}, 0, 0, FLAGS, "color" },
{ "fruit", "fruit based coloring", 0, AV_OPT_TYPE_CONST, {.i64=FRUIT}, 0, 0, FLAGS, "color" },
{ "cool", "cool based coloring", 0, AV_OPT_TYPE_CONST, {.i64=COOL}, 0, 0, FLAGS, "color" },
{ "scale", "set display scale", OFFSET(scale), AV_OPT_TYPE_INT, {.i64=LOG}, 0, NB_SCALES-1, FLAGS, "scale" },
{ "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "scale" },
{ "sqrt", "square root", 0, AV_OPT_TYPE_CONST, {.i64=SQRT}, 0, 0, FLAGS, "scale" },
{ "cbrt", "cubic root", 0, AV_OPT_TYPE_CONST, {.i64=CBRT}, 0, 0, FLAGS, "scale" },
{ "log", "logarithmic", 0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, FLAGS, "scale" },
{ "4thrt","4th root", 0, AV_OPT_TYPE_CONST, {.i64=FOURTHRT}, 0, 0, FLAGS, "scale" },
{ "5thrt","5th root", 0, AV_OPT_TYPE_CONST, {.i64=FIFTHRT}, 0, 0, FLAGS, "scale" },
{ "saturation", "color saturation multiplier", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1}, -10, 10, FLAGS },
{ "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANNING}, 0, NB_WFUNC-1, FLAGS, "win_func" },
{ "rect", "Rectangular", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_RECT}, 0, 0, FLAGS, "win_func" },
{ "bartlett", "Bartlett", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BARTLETT}, 0, 0, FLAGS, "win_func" },
{ "hann", "Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
{ "hanning", "Hanning", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HANNING}, 0, 0, FLAGS, "win_func" },
{ "hamming", "Hamming", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_HAMMING}, 0, 0, FLAGS, "win_func" },
{ "blackman", "Blackman", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BLACKMAN}, 0, 0, FLAGS, "win_func" },
{ "welch", "Welch", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_WELCH}, 0, 0, FLAGS, "win_func" },
{ "flattop", "Flat-top", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_FLATTOP}, 0, 0, FLAGS, "win_func" },
{ "bharris", "Blackman-Harris", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHARRIS}, 0, 0, FLAGS, "win_func" },
{ "bnuttall", "Blackman-Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BNUTTALL}, 0, 0, FLAGS, "win_func" },
{ "bhann", "Bartlett-Hann", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_BHANN}, 0, 0, FLAGS, "win_func" },
{ "sine", "Sine", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_SINE}, 0, 0, FLAGS, "win_func" },
{ "nuttall", "Nuttall", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_NUTTALL}, 0, 0, FLAGS, "win_func" },
{ "lanczos", "Lanczos", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_LANCZOS}, 0, 0, FLAGS, "win_func" },
{ "gauss", "Gauss", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_GAUSS}, 0, 0, FLAGS, "win_func" },
{ "tukey", "Tukey", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_TUKEY}, 0, 0, FLAGS, "win_func" },
{ "dolph", "Dolph-Chebyshev", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_DOLPH}, 0, 0, FLAGS, "win_func" },
{ "cauchy", "Cauchy", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_CAUCHY}, 0, 0, FLAGS, "win_func" },
{ "parzen", "Parzen", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_PARZEN}, 0, 0, FLAGS, "win_func" },
{ "poisson", "Poisson", 0, AV_OPT_TYPE_CONST, {.i64=WFUNC_POISSON}, 0, 0, FLAGS, "win_func" },
{ "orientation", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=VERTICAL}, 0, NB_ORIENTATIONS-1, FLAGS, "orientation" },
{ "vertical", NULL, 0, AV_OPT_TYPE_CONST, {.i64=VERTICAL}, 0, 0, FLAGS, "orientation" },
{ "horizontal", NULL, 0, AV_OPT_TYPE_CONST, {.i64=HORIZONTAL}, 0, 0, FLAGS, "orientation" },
{ "gain", "set scale gain", OFFSET(gain), AV_OPT_TYPE_FLOAT, {.dbl = 1}, 0, 128, FLAGS },
{ "legend", "draw legend", OFFSET(legend), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
{ "rotation", "color rotation", OFFSET(rotation), AV_OPT_TYPE_FLOAT, {.dbl = 0}, -1, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(showspectrumpic);
static void drawtext(AVFrame *pic, int x, int y, const char *txt, int o)
{
const uint8_t *font;
int font_height;
int i;
font = avpriv_cga_font, font_height = 8;
for (i = 0; txt[i]; i++) {
int char_y, mask;
if (o) {
for (char_y = font_height - 1; char_y >= 0; char_y--) {
uint8_t *p = pic->data[0] + (y + i * 10) * pic->linesize[0] + x;
for (mask = 0x80; mask; mask >>= 1) {