[FFmpeg-cvslog] avfilter/af_aiir: draw IR frequency response
Paul B Mahol
git at videolan.org
Wed May 30 18:31:31 EEST 2018
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Wed May 30 12:43:09 2018 +0200| [1aa519245193485cd74a52aacc99fd3fec58d0b4] | committer: Paul B Mahol
avfilter/af_aiir: draw IR frequency response
Signed-off-by: Paul B Mahol <onemda at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1aa519245193485cd74a52aacc99fd3fec58d0b4
---
doc/filters.texi | 10 ++
libavfilter/af_aiir.c | 266 +++++++++++++++++++++++++++++++++++++++++++++++---
2 files changed, 263 insertions(+), 13 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index 79a6c282cb..fb131670c7 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1136,6 +1136,16 @@ single-precision floating-point
16-bit integers
@end table
+ at item response
+Show IR frequency reponse, magnitude and phase in additional video stream.
+By default it is disabled.
+
+ at item channel
+Set for which IR channel to display frequency response. By default is first channel
+displayed. This option is used only when @var{response} is enabled.
+
+ at item size
+Set video stream size. This option is used only when @var{response} is enabled.
@end table
Coefficients in @code{tf} format are separated by spaces and are in ascending
diff --git a/libavfilter/af_aiir.c b/libavfilter/af_aiir.c
index 1f2a568c1d..65c8201137 100644
--- a/libavfilter/af_aiir.c
+++ b/libavfilter/af_aiir.c
@@ -22,7 +22,9 @@
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
+#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
+#include "libavutil/xga_font_data.h"
#include "audio.h"
#include "avfilter.h"
#include "internal.h"
@@ -58,6 +60,11 @@ typedef struct AudioIIRContext {
int format;
int process;
int precision;
+ int response;
+ int w, h;
+ int ir_channel;
+
+ AVFrame *video;
IIRChannel *iir;
int channels;
@@ -75,8 +82,20 @@ static int query_formats(AVFilterContext *ctx)
AV_SAMPLE_FMT_DBLP,
AV_SAMPLE_FMT_NONE
};
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_RGB0,
+ AV_PIX_FMT_NONE
+ };
int ret;
+ if (s->response) {
+ AVFilterLink *videolink = ctx->outputs[1];
+
+ formats = ff_make_format_list(pix_fmts);
+ if ((ret = ff_formats_ref(formats, &videolink->in_formats)) < 0)
+ return ret;
+ }
+
layouts = ff_all_channel_counts();
if (!layouts)
return AVERROR(ENOMEM);
@@ -642,6 +661,166 @@ static void convert_pd2zp(AVFilterContext *ctx, int channels)
}
}
+static void drawtext(AVFrame *pic, int x, int y, const char *txt, uint32_t color)
+{
+ 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;
+
+ uint8_t *p = pic->data[0] + y * pic->linesize[0] + (x + i * 8) * 4;
+ for (char_y = 0; char_y < font_height; char_y++) {
+ for (mask = 0x80; mask; mask >>= 1) {
+ if (font[txt[i] * font_height + char_y] & mask)
+ AV_WL32(p, color);
+ p += 4;
+ }
+ p += pic->linesize[0] - 8 * 4;
+ }
+ }
+}
+
+static void draw_line(AVFrame *out, int x0, int y0, int x1, int y1, uint32_t color)
+{
+ int dx = FFABS(x1-x0), sx = x0 < x1 ? 1 : -1;
+ int dy = FFABS(y1-y0), sy = y0 < y1 ? 1 : -1;
+ int err = (dx>dy ? dx : -dy) / 2, e2;
+
+ for (;;) {
+ AV_WL32(out->data[0] + y0 * out->linesize[0] + x0 * 4, color);
+
+ if (x0 == x1 && y0 == y1)
+ break;
+
+ e2 = err;
+
+ if (e2 >-dx) {
+ err -= dy;
+ x0 += sx;
+ }
+
+ if (e2 < dy) {
+ err += dx;
+ y0 += sy;
+ }
+ }
+}
+
+static void draw_response(AVFilterContext *ctx, AVFrame *out)
+{
+ AudioIIRContext *s = ctx->priv;
+ float *mag, *phase, min = FLT_MAX, max = FLT_MIN;
+ int prev_ymag = -1, prev_yphase = -1;
+ char text[32];
+ int ch, i, x;
+
+ memset(out->data[0], 0, s->h * out->linesize[0]);
+
+ phase = av_malloc_array(s->w, sizeof(*phase));
+ mag = av_malloc_array(s->w, sizeof(*mag));
+ if (!mag || !phase)
+ goto end;
+
+ ch = av_clip(s->ir_channel, 0, s->channels - 1);
+ for (i = 0; i < s->w; i++) {
+ const double *b = s->iir[ch].ab[0];
+ const double *a = s->iir[ch].ab[1];
+ double w = i * M_PI / (s->w - 1);
+ double realz, realp;
+ double imagz, imagp;
+ double real, imag, div;
+
+ if (s->format == 0) {
+ realz = 0., realp = 0.;
+ imagz = 0., imagp = 0.;
+ for (x = 0; x < s->iir[ch].nb_ab[1]; x++) {
+ realz += cos(-x * w) * a[x];
+ imagz += sin(-x * w) * a[x];
+ }
+
+ for (x = 0; x < s->iir[ch].nb_ab[0]; x++) {
+ realp += cos(-x * w) * b[x];
+ imagp += sin(-x * w) * b[x];
+ }
+
+ div = realp * realp + imagp * imagp;
+ real = (realz * realp + imagz * imagp) / div;
+ imag = (imagz * realp - imagp * realz) / div;
+ } else {
+ real = 1;
+ imag = 0;
+ for (x = 0; x < s->iir[ch].nb_ab[1]; x++) {
+ double ore, oim, re, im;
+
+ re = cos(w) - a[2 * x];
+ im = sin(w) - a[2 * x + 1];
+
+ ore = real;
+ oim = imag;
+
+ real = ore * re - oim * im;
+ imag = ore * im + oim * re;
+ }
+
+ for (x = 0; x < s->iir[ch].nb_ab[0]; x++) {
+ double ore, oim, re, im;
+
+ re = cos(w) - b[2 * x];
+ im = sin(w) - b[2 * x + 1];
+
+ ore = real;
+ oim = imag;
+ div = re * re + im * im;
+
+ real = (ore * re + oim * im) / div;
+ imag = (oim * re - ore * im) / div;
+ }
+ }
+
+ mag[i] = s->iir[ch].g * hypot(real, imag);
+ phase[i] = atan2(imag, real);
+ min = fminf(min, mag[i]);
+ max = fmaxf(max, mag[i]);
+ }
+
+ for (i = 0; i < s->w; i++) {
+ int ymag = mag[i] / max * (s->h - 1);
+ int yphase = (0.5 * (1. + phase[i] / M_PI)) * (s->h - 1);
+
+ ymag = s->h - 1 - av_clip(ymag, 0, s->h - 1);
+ yphase = s->h - 1 - av_clip(yphase, 0, s->h - 1);
+
+ if (prev_ymag < 0)
+ prev_ymag = ymag;
+ if (prev_yphase < 0)
+ prev_yphase = yphase;
+
+ draw_line(out, i, ymag, FFMAX(i - 1, 0), prev_ymag, 0xFFFF00FF);
+ draw_line(out, i, yphase, FFMAX(i - 1, 0), prev_yphase, 0xFF00FF00);
+
+ prev_ymag = ymag;
+ prev_yphase = yphase;
+ }
+
+ if (s->w > 400 && s->h > 100) {
+ drawtext(out, 2, 2, "Max Magnitude:", 0xDDDDDDDD);
+ snprintf(text, sizeof(text), "%.2f", max);
+ drawtext(out, 15 * 8 + 2, 2, text, 0xDDDDDDDD);
+
+ drawtext(out, 2, 12, "Min Magnitude:", 0xDDDDDDDD);
+ snprintf(text, sizeof(text), "%.2f", min);
+ drawtext(out, 15 * 8 + 2, 12, text, 0xDDDDDDDD);
+ }
+
+end:
+ av_free(phase);
+ av_free(mag);
+}
+
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
@@ -672,6 +851,15 @@ static int config_output(AVFilterLink *outlink)
convert_pd2zp(ctx, inlink->channels);
}
+ av_frame_free(&s->video);
+ if (s->response) {
+ s->video = ff_get_video_buffer(ctx->outputs[1], s->w, s->h);
+ if (!s->video)
+ return AVERROR(ENOMEM);
+
+ draw_response(ctx, s->video);
+ }
+
if (s->format == 0)
av_log(ctx, AV_LOG_WARNING, "tf coefficients format is not recommended for too high number of zeros/poles.\n");
@@ -693,7 +881,7 @@ static int config_output(AVFilterLink *outlink)
return ret;
}
- for (ch = 0; ch < inlink->channels; ch++) {
+ for (ch = 0; s->format == 0 && ch < inlink->channels; ch++) {
IIRChannel *iir = &s->iir[ch];
for (i = 1; i < iir->nb_ab[0]; i++) {
@@ -722,7 +910,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
AVFilterLink *outlink = ctx->outputs[0];
ThreadData td;
AVFrame *out;
- int ch;
+ int ch, ret;
if (av_frame_is_writable(in)) {
out = in;
@@ -749,12 +937,35 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
if (in != out)
av_frame_free(&in);
+ if (s->response) {
+ AVFilterLink *outlink = ctx->outputs[1];
+
+ s->video->pts = out->pts;
+ ret = ff_filter_frame(outlink, av_frame_clone(s->video));
+ if (ret < 0)
+ return ret;
+ }
+
return ff_filter_frame(outlink, out);
}
+static int config_video(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ AudioIIRContext *s = ctx->priv;
+
+ outlink->sample_aspect_ratio = (AVRational){1,1};
+ outlink->w = s->w;
+ outlink->h = s->h;
+
+ return 0;
+}
+
static av_cold int init(AVFilterContext *ctx)
{
AudioIIRContext *s = ctx->priv;
+ AVFilterPad pad, vpad;
+ int ret;
if (!s->a_str || !s->b_str || !s->g_str) {
av_log(ctx, AV_LOG_ERROR, "Valid coefficients are mandatory.\n");
@@ -769,6 +980,35 @@ static av_cold int init(AVFilterContext *ctx)
default: return AVERROR_BUG;
}
+ pad = (AVFilterPad){
+ .name = av_strdup("default"),
+ .type = AVMEDIA_TYPE_AUDIO,
+ .config_props = config_output,
+ };
+
+ if (!pad.name)
+ return AVERROR(ENOMEM);
+
+ if (s->response) {
+ vpad = (AVFilterPad){
+ .name = av_strdup("filter_response"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_video,
+ };
+ if (!vpad.name)
+ return AVERROR(ENOMEM);
+ }
+
+ ret = ff_insert_outpad(ctx, 0, &pad);
+ if (ret < 0)
+ return ret;
+
+ if (s->response) {
+ ret = ff_insert_outpad(ctx, 1, &vpad);
+ if (ret < 0)
+ return ret;
+ }
+
return 0;
}
@@ -788,6 +1028,11 @@ static av_cold void uninit(AVFilterContext *ctx)
}
}
av_freep(&s->iir);
+
+ av_freep(&ctx->output_pads[0].name);
+ if (s->response)
+ av_freep(&ctx->output_pads[1].name);
+ av_frame_free(&s->video);
}
static const AVFilterPad inputs[] = {
@@ -799,17 +1044,9 @@ static const AVFilterPad inputs[] = {
{ NULL }
};
-static const AVFilterPad outputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_AUDIO,
- .config_props = config_output,
- },
- { NULL }
-};
-
#define OFFSET(x) offsetof(AudioIIRContext, x)
#define AF AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+#define VF AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption aiir_options[] = {
{ "z", "set B/numerator/zeros coefficients", OFFSET(b_str), AV_OPT_TYPE_STRING, {.str="1+0i 1-0i"}, 0, 0, AF },
@@ -830,6 +1067,9 @@ static const AVOption aiir_options[] = {
{ "flt", "single-precision floating-point", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AF, "precision" },
{ "i32", "32-bit integers", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, AF, "precision" },
{ "i16", "16-bit integers", 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, AF, "precision" },
+ { "response", "show IR frequency response", OFFSET(response), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, VF },
+ { "channel", "set IR channel to display frequency response", OFFSET(ir_channel), AV_OPT_TYPE_INT, {.i64=0}, 0, 1024, VF },
+ { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "hd720"}, 0, 0, VF },
{ NULL },
};
@@ -844,6 +1084,6 @@ AVFilter ff_af_aiir = {
.uninit = uninit,
.query_formats = query_formats,
.inputs = inputs,
- .outputs = outputs,
- .flags = AVFILTER_FLAG_SLICE_THREADS,
+ .flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS |
+ AVFILTER_FLAG_SLICE_THREADS,
};
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