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avfilter/af_afir: draw IR frequency response

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2018-05-29 18:24:22 +02:00
parent bdf1bbdbb4
commit 73438dbbbc
3 changed files with 212 additions and 13 deletions
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11
doc/filters.texi
View File

@ -969,6 +969,17 @@ Enable applying gain measured from power of IR.
@item maxir
Set max allowed Impulse Response filter duration in seconds. Default is 30 seconds.
Allowed range is 0.1 to 60 seconds.
@item response
Show IR frequency reponse, magnitude and phase in additional video stream.
By default it is disabled.
@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.
@item size
Set video stream size. This option is used only when @var{response} is enabled.
@end table
@subsection Examples

210
libavfilter/af_afir.c
View File

@ -23,10 +23,14 @@
* An arbitrary audio FIR filter
*/
#include <float.h>
#include "libavutil/audio_fifo.h"
#include "libavutil/common.h"
#include "libavutil/float_dsp.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/xga_font_data.h"
#include "libavcodec/avfft.h"
#include "audio.h"
@ -162,6 +166,122 @@ static int fir_frame(AudioFIRContext *s, AVFilterLink *outlink)
return ret;
}
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)
{
AudioFIRContext *s = ctx->priv;
float *mag, *phase, min = FLT_MAX, max = FLT_MIN;
int prev_ymag = -1, prev_yphase = -1;
char text[32];
int channel, 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;
channel = av_clip(s->ir_channel, 0, s->in[1]->channels);
for (i = 0; i < s->w; i++) {
const float *src = (const float *)s->in[1]->extended_data[channel];
double w = i * M_PI / (s->w - 1);
double real = 0.;
double imag = 0.;
for (x = 0; x < s->nb_taps; x++) {
real += cos(-x * w) * src[x];
imag += sin(-x * w) * src[x];
}
mag[i] = 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 convert_coeffs(AVFilterContext *ctx)
{
AudioFIRContext *s = ctx->priv;
@ -216,6 +336,9 @@ static int convert_coeffs(AVFilterContext *ctx)
av_audio_fifo_read(s->fifo[1], (void **)s->in[1]->extended_data, s->nb_taps);
if (s->response)
draw_response(ctx, s->video);
if (s->again) {
float power = 0;
@ -322,6 +445,13 @@ static int filter_frame(AVFilterLink *link, AVFrame *frame)
return ret;
}
if (s->response && s->have_coeffs) {
s->video->pts = s->pts;
ret = ff_filter_frame(ctx->outputs[1], av_frame_clone(s->video));
if (ret < 0)
return ret;
}
if (s->have_coeffs) {
while (av_audio_fifo_size(s->fifo[0]) >= s->part_size) {
ret = fir_frame(s, outlink);
@ -373,14 +503,26 @@ static int request_frame(AVFilterLink *outlink)
static int query_formats(AVFilterContext *ctx)
{
AudioFIRContext *s = ctx->priv;
AVFilterFormats *formats;
AVFilterChannelLayouts *layouts;
static const enum AVSampleFormat sample_fmts[] = {
AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_NONE
};
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_RGB0,
AV_PIX_FMT_NONE
};
int ret, i;
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 ((ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts)) < 0)
return ret;
@ -488,11 +630,59 @@ static av_cold void uninit(AVFilterContext *ctx)
av_audio_fifo_free(s->fifo[1]);
av_freep(&s->fdsp);
av_freep(&ctx->output_pads[0].name);
if (s->response)
av_freep(&ctx->output_pads[1].name);
av_frame_free(&s->video);
}
static int config_video(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AudioFIRContext *s = ctx->priv;
outlink->sample_aspect_ratio = (AVRational){1,1};
outlink->w = s->w;
outlink->h = s->h;
av_frame_free(&s->video);
s->video = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!s->video)
return AVERROR(ENOMEM);
return 0;
}
static av_cold int init(AVFilterContext *ctx)
{
AudioFIRContext *s = ctx->priv;
AVFilterPad pad, vpad;
pad = (AVFilterPad){
.name = av_strdup("default"),
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_output,
.request_frame = request_frame,
};
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);
}
ff_insert_outpad(ctx, 0, &pad);
if (s->response)
ff_insert_outpad(ctx, 1, &vpad);
s->fcmul_add = fcmul_add_c;
@ -519,17 +709,8 @@ static const AVFilterPad afir_inputs[] = {
{ NULL }
};
static const AVFilterPad afir_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_output,
.request_frame = request_frame,
},
{ NULL }
};
#define AF AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define VF AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define OFFSET(x) offsetof(AudioFIRContext, x)
static const AVOption afir_options[] = {
@ -537,7 +718,10 @@ static const AVOption afir_options[] = {
{ "wet", "set wet gain", OFFSET(wet_gain), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, AF },
{ "length", "set IR length", OFFSET(length), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 1, AF },
{ "again", "enable auto gain", OFFSET(again), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, AF },
{ "maxir", "set max ir length", OFFSET(max_ir_len), AV_OPT_TYPE_FLOAT, {.dbl=30}, 0.1, 60, AF },
{ "maxir", "set max IR length", OFFSET(max_ir_len), AV_OPT_TYPE_FLOAT, {.dbl=30}, 0.1, 60, AF },
{ "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 }
};
@ -552,6 +736,6 @@ AVFilter ff_af_afir = {
.init = init,
.uninit = uninit,
.inputs = afir_inputs,
.outputs = afir_outputs,
.flags = AVFILTER_FLAG_SLICE_THREADS,
.flags = AVFILTER_FLAG_DYNAMIC_OUTPUTS |
AVFILTER_FLAG_SLICE_THREADS,
};

4
libavfilter/af_afir.h
View File

@ -40,6 +40,9 @@ typedef struct AudioFIRContext {
float length;
int again;
float max_ir_len;
int response;
int w, h;
int ir_channel;
float gain;
@ -69,6 +72,7 @@ typedef struct AudioFIRContext {
AVAudioFifo *fifo[2];
AVFrame *in[2];
AVFrame *buffer;
AVFrame *video;
int64_t pts;
int index;