This patch extends aphasemeter filter to display metadata for out-of-phase
or mono sequences of stereo streams.
Displays start, end and duration as for silencedetect filter.
From 763cd15c156be8ef7c577519e57bf14990adcf69 Mon Sep 17 00:00:00 2001
From: Romane Lafon <romane@nomalab.com>
Date: Wed, 8 May 2019 17:59:29 +0200
Subject: [PATCH] avfilter/avf_aphasemeter: Add out of phase and mono detection
Signed-off-by: Romane Lafon <romane@nomalab.com>
---
libavfilter/avf_aphasemeter.c | 108 ++++++++++++++++++++++++++++++++++++++++--
1 file changed, 104 insertions(+), 4 deletions(-)
diff --git a/libavfilter/avf_aphasemeter.c b/libavfilter/avf_aphasemeter.c
index ed837059ea..e2c534d0c9 100644
--- a/libavfilter/avf_aphasemeter.c
+++ b/libavfilter/avf_aphasemeter.c
@@ -28,26 +28,40 @@
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
+#include "libavutil/timestamp.h"
#include "avfilter.h"
#include "formats.h"
#include "audio.h"
#include "video.h"
#include "internal.h"
+#include "stdbool.h"
+#include "float.h"
typedef struct AudioPhaseMeterContext {
const AVClass *class;
AVFrame *out;
int do_video;
+ int do_phasing_detection;
int w, h;
AVRational frame_rate;
int contrast[4];
uint8_t *mpc_str;
uint8_t mpc[4];
int draw_median_phase;
+ float tolerance;
+ float angle;
+ bool is_mono;
+ bool is_out_phase;
+ float mono_idx[2];
+ float out_idx[2];
+ double duration;
+ float phase;
+ bool start_presence;
} AudioPhaseMeterContext;
#define OFFSET(x) offsetof(AudioPhaseMeterContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+#define pi 3.14159265359
static const AVOption aphasemeter_options[] = {
{ "rate", "set video rate", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
@@ -59,6 +73,10 @@ static const AVOption aphasemeter_options[] = {
{ "bc", "set blue contrast", OFFSET(contrast[2]), AV_OPT_TYPE_INT, {.i64=1}, 0, 255, FLAGS },
{ "mpc", "set median phase color", OFFSET(mpc_str), AV_OPT_TYPE_STRING, {.str = "none"}, 0, 0, FLAGS },
{ "video", "set video output", OFFSET(do_video), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
+ { "phasing", "set mono and out-of-phase detection output", OFFSET(do_phasing_detection), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
+ { "tolerance", "set phase tolerance", OFFSET(tolerance), AV_OPT_TYPE_FLOAT, {.i64 = 0}, 0, 1, FLAGS },
+ { "angle", "set angle threshold for out-of-phase detection", OFFSET(angle), AV_OPT_TYPE_FLOAT, {.i64 = 175}, 0, 180, FLAGS },
+ { "duration", "set minimum mono duration in seconds", OFFSET(duration), AV_OPT_TYPE_DOUBLE, {.dbl=2.}, 0, 24*60*60, FLAGS },
{ NULL }
};
@@ -140,6 +158,27 @@ static inline int get_x(float phase, int w)
return (phase + 1.) / 2. * (w - 1);
}
+static float get_index(AVFilterLink *inlink, AVFrame *in)
+{
+ char *index_str = av_ts2timestr(in->pts, &inlink->time_base);
+ return atof(index_str);
+}
+
+static float get_duration(float index[2])
+{
+ return index[1] - index[0];
+}
+
+static void set_meta(AVFrame *insamples, const char *key, float value)
+{
+ char buf[128];
+ char str[128];
+
+ snprintf(str, sizeof(str), "%f", value);
+ snprintf(buf, sizeof(buf), "lavfi.aphasemeter.%s", key);
+ av_dict_set(&insamples->metadata, buf, str, 0);
+}
+
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
@@ -154,6 +193,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
AVFrame *out;
uint8_t *dst;
int i;
+ float tolerance = 1.0 - s->tolerance;
+ float angle = cos(s->angle/180.0*pi);
if (s->do_video && (!s->out || s->out->width != outlink->w ||
s->out->height != outlink->h)) {
@@ -193,7 +234,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
fphase += phase;
}
fphase /= in->nb_samples;
-
+ s->phase = fphase;
if (s->do_video) {
if (s->draw_median_phase) {
dst = out->data[0] + get_x(fphase, s->w) * 4;
@@ -206,10 +247,54 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
metadata = &in->metadata;
if (metadata) {
- uint8_t value[128];
+ set_meta(in, "phase", fphase);
+ }
+
+ if (s->do_phasing_detection) {
+ if ((s->is_mono == false) && ((tolerance - fphase) < FLT_EPSILON)) {
+ s->is_mono = true;
+ s->start_presence = true;
+ s->mono_idx[0] = get_index(inlink, in);
+ }
+ if ((s->is_mono == true) && ((tolerance - fphase) < FLT_EPSILON) && (s->start_presence == true)) {
+ float mono_duration;
+ s->mono_idx[1] = get_index(inlink, in);
+ mono_duration = get_duration(s->mono_idx);
+ if (mono_duration >= s->duration) {
+ set_meta(in, "mono_start", s->mono_idx[0]);
+ av_log(s, AV_LOG_INFO, "mono_start: %f\n", s->mono_idx[0]);
+ s->start_presence = false;
+ }
+ }
+ if ((s->is_mono == true) && ((tolerance - fphase) > FLT_EPSILON)) {
+ float mono_duration;
+ s->mono_idx[1] = get_index(inlink, in);
+ mono_duration = get_duration(s->mono_idx);
+ if (mono_duration > s->duration) {
+ set_meta(in, "mono_end", s->mono_idx[1]);
+ set_meta(in, "mono_duration", mono_duration);
+ av_log(s, AV_LOG_INFO, "mono_end: %f | mono_duration: %f\n", s->mono_idx[1], mono_duration);
+ }
+ s->is_mono = false;
+ }
- snprintf(value, sizeof(value), "%f", fphase);
- av_dict_set(metadata, "lavfi.aphasemeter.phase", value, 0);
+ if ((s->is_out_phase == false) && (fphase <= angle)) {
+ s->out_idx[0] = get_index(inlink, in);
+ s->is_out_phase = true;
+ }
+ if ((s->is_out_phase == true) && (fphase > angle)) {
+ float out_phase_duration;
+ s->out_idx[1] = get_index(inlink, in);
+ out_phase_duration = get_duration(s->out_idx);
+
+ set_meta(in, "out_phase_start", s->out_idx[0]);
+ av_log(s, AV_LOG_INFO, "out_phase_start: %f\n", s->out_idx[0]);
+ set_meta(in, "out_phase_end", s->out_idx[1]);
+ set_meta(in, "out_phase_duration", out_phase_duration);
+ av_log(s, AV_LOG_INFO, "out_phase_end: %f | out_phase_duration: %f\n", s->out_idx[1], out_phase_duration);
+
+ s->is_out_phase = false;
+ }
}
if (s->do_video) {
@@ -224,6 +309,21 @@ static av_cold void uninit(AVFilterContext *ctx)
AudioPhaseMeterContext *s = ctx->priv;
int i;
+ if (s->do_phasing_detection) {
+ float tolerance = 1.0 - s->tolerance;
+ float mono_duration;
+ AVFilterLink *inlink = ctx->inputs[0];
+
+ if ((s->is_mono == true) && (fabs(tolerance - s->phase) < FLT_EPSILON)) {
+ char *index_str = av_ts2timestr(inlink->current_pts, &inlink->time_base);
+ s->mono_idx[1] = atof(index_str);
+ mono_duration = get_duration(s->mono_idx);
+ if (mono_duration > s->duration) {
+ av_log(s, AV_LOG_INFO, "mono_end: %f | mono_duration: %f\n", s->mono_idx[1], mono_duration);
+ }
+ s->is_mono = false;
+ }
+ }
av_frame_free(&s->out);
for (i = 0; i < ctx->nb_outputs; i++)
av_freep(&ctx->output_pads[i].name);
--
2.11.0
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
To unsubscribe, visit link above, or email
ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
