mirror of https://git.ffmpeg.org/ffmpeg.git
avfilter/af_afir: draw IR frequency response
Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol
parent
bdf1bbdbb4
commit
73438dbbbc
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@ -969,6 +969,17 @@ Enable applying gain measured from power of IR.
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@item maxir
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Set max allowed Impulse Response filter duration in seconds. Default is 30 seconds.
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Allowed range is 0.1 to 60 seconds.
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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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@subsection Examples
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@ -23,10 +23,14 @@
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* An arbitrary audio FIR filter
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*/
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#include <float.h>
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#include "libavutil/audio_fifo.h"
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#include "libavutil/common.h"
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#include "libavutil/float_dsp.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 "libavcodec/avfft.h"
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#include "audio.h"
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@ -162,6 +166,122 @@ static int fir_frame(AudioFIRContext *s, AVFilterLink *outlink)
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return ret;
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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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AudioFIRContext *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 channel, 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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channel = av_clip(s->ir_channel, 0, s->in[1]->channels);
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for (i = 0; i < s->w; i++) {
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const float *src = (const float *)s->in[1]->extended_data[channel];
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double w = i * M_PI / (s->w - 1);
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double real = 0.;
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double imag = 0.;
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for (x = 0; x < s->nb_taps; x++) {
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real += cos(-x * w) * src[x];
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imag += sin(-x * w) * src[x];
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}
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mag[i] = 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 convert_coeffs(AVFilterContext *ctx)
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{
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AudioFIRContext *s = ctx->priv;
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@ -216,6 +336,9 @@ static int convert_coeffs(AVFilterContext *ctx)
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av_audio_fifo_read(s->fifo[1], (void **)s->in[1]->extended_data, s->nb_taps);
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if (s->response)
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draw_response(ctx, s->video);
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if (s->again) {
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float power = 0;
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@ -322,6 +445,13 @@ static int filter_frame(AVFilterLink *link, AVFrame *frame)
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return ret;
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}
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if (s->response && s->have_coeffs) {
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s->video->pts = s->pts;
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ret = ff_filter_frame(ctx->outputs[1], 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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if (s->have_coeffs) {
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while (av_audio_fifo_size(s->fifo[0]) >= s->part_size) {
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ret = fir_frame(s, outlink);
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@ -373,14 +503,26 @@ static int request_frame(AVFilterLink *outlink)
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static int query_formats(AVFilterContext *ctx)
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{
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AudioFIRContext *s = ctx->priv;
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AVFilterFormats *formats;
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AVFilterChannelLayouts *layouts;
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static const enum AVSampleFormat sample_fmts[] = {
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AV_SAMPLE_FMT_FLTP,
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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, i;
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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 ((ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts)) < 0)
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return ret;
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@ -488,11 +630,59 @@ static av_cold void uninit(AVFilterContext *ctx)
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av_audio_fifo_free(s->fifo[1]);
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av_freep(&s->fdsp);
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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 int config_video(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AudioFIRContext *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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av_frame_free(&s->video);
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s->video = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!s->video)
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return AVERROR(ENOMEM);
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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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AudioFIRContext *s = ctx->priv;
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AVFilterPad pad, vpad;
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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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.request_frame = request_frame,
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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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ff_insert_outpad(ctx, 0, &pad);
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if (s->response)
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ff_insert_outpad(ctx, 1, &vpad);
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s->fcmul_add = fcmul_add_c;
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@ -519,17 +709,8 @@ static const AVFilterPad afir_inputs[] = {
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{ NULL }
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};
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static const AVFilterPad afir_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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.request_frame = request_frame,
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},
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{ NULL }
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};
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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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#define OFFSET(x) offsetof(AudioFIRContext, x)
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static const AVOption afir_options[] = {
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@ -537,7 +718,10 @@ static const AVOption afir_options[] = {
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{ "wet", "set wet gain", OFFSET(wet_gain), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 10, AF },
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{ "length", "set IR length", OFFSET(length), AV_OPT_TYPE_FLOAT, {.dbl=1}, 0, 1, AF },
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{ "again", "enable auto gain", OFFSET(again), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, AF },
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{ "maxir", "set max ir length", OFFSET(max_ir_len), AV_OPT_TYPE_FLOAT, {.dbl=30}, 0.1, 60, AF },
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{ "maxir", "set max IR length", OFFSET(max_ir_len), AV_OPT_TYPE_FLOAT, {.dbl=30}, 0.1, 60, AF },
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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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@ -552,6 +736,6 @@ AVFilter ff_af_afir = {
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.init = init,
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.uninit = uninit,
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.inputs = afir_inputs,
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.outputs = afir_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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@ -40,6 +40,9 @@ typedef struct AudioFIRContext {
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float length;
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int again;
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float max_ir_len;
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int response;
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int w, h;
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int ir_channel;
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float gain;
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@ -69,6 +72,7 @@ typedef struct AudioFIRContext {
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AVAudioFifo *fifo[2];
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AVFrame *in[2];
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AVFrame *buffer;
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AVFrame *video;
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int64_t pts;
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int index;
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