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avfilter/af_aiir: draw IR frequency response
Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol
parent
d0e740b8fb
commit
1aa5192451
@ -1136,6 +1136,16 @@ single-precision floating-point
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16-bit integers
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@end table
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@item response
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Show IR frequency reponse, magnitude and phase in additional video stream.
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By default it is disabled.
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@item channel
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Set for which IR channel to display frequency response. By default is first channel
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displayed. This option is used only when @var{response} is enabled.
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@item size
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Set video stream size. This option is used only when @var{response} is enabled.
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@end table
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Coefficients in @code{tf} format are separated by spaces and are in ascending
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@ -22,7 +22,9 @@
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "libavutil/xga_font_data.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "internal.h"
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@ -58,6 +60,11 @@ typedef struct AudioIIRContext {
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int format;
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int process;
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int precision;
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int response;
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int w, h;
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int ir_channel;
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AVFrame *video;
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IIRChannel *iir;
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int channels;
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@ -75,8 +82,20 @@ static int query_formats(AVFilterContext *ctx)
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AV_SAMPLE_FMT_DBLP,
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AV_SAMPLE_FMT_NONE
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};
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_RGB0,
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AV_PIX_FMT_NONE
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};
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int ret;
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if (s->response) {
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AVFilterLink *videolink = ctx->outputs[1];
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formats = ff_make_format_list(pix_fmts);
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if ((ret = ff_formats_ref(formats, &videolink->in_formats)) < 0)
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return ret;
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}
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layouts = ff_all_channel_counts();
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if (!layouts)
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return AVERROR(ENOMEM);
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@ -642,6 +661,166 @@ static void convert_pd2zp(AVFilterContext *ctx, int channels)
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}
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}
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static void drawtext(AVFrame *pic, int x, int y, const char *txt, uint32_t color)
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{
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const uint8_t *font;
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int font_height;
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int i;
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font = avpriv_cga_font, font_height = 8;
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for (i = 0; txt[i]; i++) {
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int char_y, mask;
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uint8_t *p = pic->data[0] + y * pic->linesize[0] + (x + i * 8) * 4;
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for (char_y = 0; char_y < font_height; char_y++) {
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for (mask = 0x80; mask; mask >>= 1) {
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if (font[txt[i] * font_height + char_y] & mask)
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AV_WL32(p, color);
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p += 4;
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}
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p += pic->linesize[0] - 8 * 4;
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}
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}
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}
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static void draw_line(AVFrame *out, int x0, int y0, int x1, int y1, uint32_t color)
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{
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int dx = FFABS(x1-x0), sx = x0 < x1 ? 1 : -1;
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int dy = FFABS(y1-y0), sy = y0 < y1 ? 1 : -1;
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int err = (dx>dy ? dx : -dy) / 2, e2;
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for (;;) {
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AV_WL32(out->data[0] + y0 * out->linesize[0] + x0 * 4, color);
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if (x0 == x1 && y0 == y1)
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break;
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e2 = err;
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if (e2 >-dx) {
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err -= dy;
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x0 += sx;
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}
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if (e2 < dy) {
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err += dx;
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y0 += sy;
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}
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}
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}
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static void draw_response(AVFilterContext *ctx, AVFrame *out)
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{
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AudioIIRContext *s = ctx->priv;
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float *mag, *phase, min = FLT_MAX, max = FLT_MIN;
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int prev_ymag = -1, prev_yphase = -1;
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char text[32];
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int ch, i, x;
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memset(out->data[0], 0, s->h * out->linesize[0]);
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phase = av_malloc_array(s->w, sizeof(*phase));
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mag = av_malloc_array(s->w, sizeof(*mag));
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if (!mag || !phase)
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goto end;
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ch = av_clip(s->ir_channel, 0, s->channels - 1);
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for (i = 0; i < s->w; i++) {
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const double *b = s->iir[ch].ab[0];
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const double *a = s->iir[ch].ab[1];
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double w = i * M_PI / (s->w - 1);
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double realz, realp;
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double imagz, imagp;
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double real, imag, div;
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if (s->format == 0) {
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realz = 0., realp = 0.;
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imagz = 0., imagp = 0.;
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for (x = 0; x < s->iir[ch].nb_ab[1]; x++) {
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realz += cos(-x * w) * a[x];
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imagz += sin(-x * w) * a[x];
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}
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for (x = 0; x < s->iir[ch].nb_ab[0]; x++) {
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realp += cos(-x * w) * b[x];
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imagp += sin(-x * w) * b[x];
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}
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div = realp * realp + imagp * imagp;
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real = (realz * realp + imagz * imagp) / div;
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imag = (imagz * realp - imagp * realz) / div;
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} else {
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real = 1;
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imag = 0;
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for (x = 0; x < s->iir[ch].nb_ab[1]; x++) {
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double ore, oim, re, im;
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re = cos(w) - a[2 * x];
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im = sin(w) - a[2 * x + 1];
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ore = real;
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oim = imag;
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real = ore * re - oim * im;
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imag = ore * im + oim * re;
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}
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for (x = 0; x < s->iir[ch].nb_ab[0]; x++) {
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double ore, oim, re, im;
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re = cos(w) - b[2 * x];
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im = sin(w) - b[2 * x + 1];
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ore = real;
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oim = imag;
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div = re * re + im * im;
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real = (ore * re + oim * im) / div;
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imag = (oim * re - ore * im) / div;
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}
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}
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mag[i] = s->iir[ch].g * hypot(real, imag);
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phase[i] = atan2(imag, real);
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min = fminf(min, mag[i]);
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max = fmaxf(max, mag[i]);
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}
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for (i = 0; i < s->w; i++) {
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int ymag = mag[i] / max * (s->h - 1);
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int yphase = (0.5 * (1. + phase[i] / M_PI)) * (s->h - 1);
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ymag = s->h - 1 - av_clip(ymag, 0, s->h - 1);
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yphase = s->h - 1 - av_clip(yphase, 0, s->h - 1);
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if (prev_ymag < 0)
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prev_ymag = ymag;
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if (prev_yphase < 0)
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prev_yphase = yphase;
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draw_line(out, i, ymag, FFMAX(i - 1, 0), prev_ymag, 0xFFFF00FF);
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draw_line(out, i, yphase, FFMAX(i - 1, 0), prev_yphase, 0xFF00FF00);
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prev_ymag = ymag;
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prev_yphase = yphase;
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}
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if (s->w > 400 && s->h > 100) {
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drawtext(out, 2, 2, "Max Magnitude:", 0xDDDDDDDD);
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snprintf(text, sizeof(text), "%.2f", max);
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drawtext(out, 15 * 8 + 2, 2, text, 0xDDDDDDDD);
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drawtext(out, 2, 12, "Min Magnitude:", 0xDDDDDDDD);
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snprintf(text, sizeof(text), "%.2f", min);
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drawtext(out, 15 * 8 + 2, 12, text, 0xDDDDDDDD);
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}
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end:
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av_free(phase);
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av_free(mag);
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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@ -672,6 +851,15 @@ static int config_output(AVFilterLink *outlink)
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convert_pd2zp(ctx, inlink->channels);
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}
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av_frame_free(&s->video);
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if (s->response) {
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s->video = ff_get_video_buffer(ctx->outputs[1], s->w, s->h);
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if (!s->video)
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return AVERROR(ENOMEM);
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draw_response(ctx, s->video);
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}
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if (s->format == 0)
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av_log(ctx, AV_LOG_WARNING, "tf coefficients format is not recommended for too high number of zeros/poles.\n");
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@ -693,7 +881,7 @@ static int config_output(AVFilterLink *outlink)
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return ret;
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}
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for (ch = 0; ch < inlink->channels; ch++) {
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for (ch = 0; s->format == 0 && ch < inlink->channels; ch++) {
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IIRChannel *iir = &s->iir[ch];
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for (i = 1; i < iir->nb_ab[0]; i++) {
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@ -722,7 +910,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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AVFilterLink *outlink = ctx->outputs[0];
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ThreadData td;
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AVFrame *out;
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int ch;
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int ch, ret;
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if (av_frame_is_writable(in)) {
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out = in;
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@ -749,12 +937,35 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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if (in != out)
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av_frame_free(&in);
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if (s->response) {
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AVFilterLink *outlink = ctx->outputs[1];
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s->video->pts = out->pts;
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ret = ff_filter_frame(outlink, av_frame_clone(s->video));
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if (ret < 0)
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return ret;
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}
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return ff_filter_frame(outlink, out);
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}
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static int config_video(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AudioIIRContext *s = ctx->priv;
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outlink->sample_aspect_ratio = (AVRational){1,1};
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outlink->w = s->w;
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outlink->h = s->h;
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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AudioIIRContext *s = ctx->priv;
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AVFilterPad pad, vpad;
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int ret;
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if (!s->a_str || !s->b_str || !s->g_str) {
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av_log(ctx, AV_LOG_ERROR, "Valid coefficients are mandatory.\n");
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@ -769,6 +980,35 @@ static av_cold int init(AVFilterContext *ctx)
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default: return AVERROR_BUG;
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}
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pad = (AVFilterPad){
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.name = av_strdup("default"),
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.type = AVMEDIA_TYPE_AUDIO,
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.config_props = config_output,
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};
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if (!pad.name)
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return AVERROR(ENOMEM);
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if (s->response) {
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vpad = (AVFilterPad){
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.name = av_strdup("filter_response"),
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_video,
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};
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if (!vpad.name)
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return AVERROR(ENOMEM);
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}
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ret = ff_insert_outpad(ctx, 0, &pad);
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if (ret < 0)
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return ret;
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if (s->response) {
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ret = ff_insert_outpad(ctx, 1, &vpad);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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@ -788,6 +1028,11 @@ static av_cold void uninit(AVFilterContext *ctx)
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}
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}
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av_freep(&s->iir);
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av_freep(&ctx->output_pads[0].name);
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if (s->response)
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av_freep(&ctx->output_pads[1].name);
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av_frame_free(&s->video);
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}
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static const AVFilterPad inputs[] = {
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@ -799,17 +1044,9 @@ static const AVFilterPad inputs[] = {
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{ NULL }
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};
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static const AVFilterPad outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.config_props = config_output,
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},
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{ NULL }
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};
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#define OFFSET(x) offsetof(AudioIIRContext, x)
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#define AF AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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#define VF AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption aiir_options[] = {
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{ "z", "set B/numerator/zeros coefficients", OFFSET(b_str), AV_OPT_TYPE_STRING, {.str="1+0i 1-0i"}, 0, 0, AF },
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@ -830,6 +1067,9 @@ static const AVOption aiir_options[] = {
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{ "flt", "single-precision floating-point", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AF, "precision" },
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{ "i32", "32-bit integers", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, AF, "precision" },
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{ "i16", "16-bit integers", 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, AF, "precision" },
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{ "response", "show IR frequency response", OFFSET(response), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, VF },
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{ "channel", "set IR channel to display frequency response", OFFSET(ir_channel), AV_OPT_TYPE_INT, {.i64=0}, 0, 1024, VF },
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{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "hd720"}, 0, 0, VF },
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{ NULL },
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};
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@ -844,6 +1084,6 @@ AVFilter ff_af_aiir = {
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = inputs,
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.outputs = outputs,
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.flags = AVFILTER_FLAG_SLICE_THREADS,
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.flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS |
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AVFILTER_FLAG_SLICE_THREADS,
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};
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