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avfilter/avf_aphasemeter: add out of phase and mono detection

Extend aphasemeter to detect out of phase or mono sequences in
stereo streams.

Signed-off-by: Romane Lafon <romane@nomalab.com>
This commit is contained in:
Romane Lafon
2020-10-12 19:01:17 +02:00
committed by Paul B Mahol
parent 6707152f08
commit d60927b676
2 changed files with 150 additions and 1 deletions

View File

@ -28,26 +28,43 @@
#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 "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;
int is_mono;
int is_out_phase;
int start_mono_presence;
int start_out_phase_presence;
float tolerance;
float angle;
float phase;
AVRational time_base;
int64_t duration;
int64_t frame_end;
int64_t mono_idx[2];
int64_t out_phase_idx[2];
} AudioPhaseMeterContext;
#define MAX_DURATION (24*60*60*1000000LL)
#define OFFSET(x) offsetof(AudioPhaseMeterContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define get_duration(index) (index[1] - index[0])
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 +76,13 @@ 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 for mono detection", OFFSET(tolerance), AV_OPT_TYPE_FLOAT, {.dbl = 0.}, 0, 1, FLAGS },
{ "t", "set phase tolerance for mono detection", OFFSET(tolerance), AV_OPT_TYPE_FLOAT, {.dbl = 0.}, 0, 1, FLAGS },
{ "angle", "set angle threshold for out-of-phase detection", OFFSET(angle), AV_OPT_TYPE_FLOAT, {.dbl = 170.}, 90, 180, FLAGS },
{ "a", "set angle threshold for out-of-phase detection", OFFSET(angle), AV_OPT_TYPE_FLOAT, {.dbl = 170.}, 90, 180, FLAGS },
{ "duration", "set minimum mono or out-of-phase duration in seconds", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=2000000}, 0, MAX_DURATION, FLAGS },
{ "d", "set minimum mono or out-of-phase duration in seconds", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=2000000}, 0, MAX_DURATION, FLAGS },
{ NULL }
};
@ -104,6 +128,7 @@ static int config_input(AVFilterLink *inlink)
AVFilterContext *ctx = inlink->dst;
AudioPhaseMeterContext *s = ctx->priv;
int nb_samples;
s->duration = av_rescale(s->duration, inlink->sample_rate, AV_TIME_BASE);
if (s->do_video) {
nb_samples = FFMAX(1, av_rescale(inlink->sample_rate, s->frame_rate.den, s->frame_rate.num));
@ -140,6 +165,76 @@ static inline int get_x(float phase, int w)
return (phase + 1.) / 2. * (w - 1);
}
static inline void add_metadata(AVFrame *insamples, const char *key, char *value)
{
char buf[128];
snprintf(buf, sizeof(buf), "lavfi.aphasemeter.%s", key);
av_dict_set(&insamples->metadata, buf, value, 0);
}
static inline void update_mono_detection(AudioPhaseMeterContext *s, AVFrame *insamples, int mono_measurement)
{
int64_t mono_duration;
if (!s->is_mono && mono_measurement) {
s->is_mono = 1;
s->start_mono_presence = 1;
s->mono_idx[0] = insamples->pts;
}
if (s->is_mono && mono_measurement && s->start_mono_presence) {
s->mono_idx[1] = s->frame_end;
mono_duration = get_duration(s->mono_idx);
if (mono_duration >= s->duration) {
add_metadata(insamples, "mono_start", av_ts2timestr(s->mono_idx[0], &s->time_base));
av_log(s, AV_LOG_INFO, "mono_start: %s\n", av_ts2timestr(s->mono_idx[0], &s->time_base));
s->start_mono_presence = 0;
}
}
if (s->is_mono && !mono_measurement) {
s->mono_idx[1] = insamples ? insamples->pts : s->frame_end;
mono_duration = get_duration(s->mono_idx);
if (mono_duration >= s->duration) {
if (insamples) {
add_metadata(insamples, "mono_end", av_ts2timestr(s->mono_idx[1], &s->time_base));
add_metadata(insamples, "mono_duration", av_ts2timestr(mono_duration, &s->time_base));
}
av_log(s, AV_LOG_INFO, "mono_end: %s | mono_duration: %s\n", av_ts2timestr(s->mono_idx[1], &s->time_base), av_ts2timestr(mono_duration, &s->time_base));
}
s->is_mono = 0;
}
}
static inline void update_out_phase_detection(AudioPhaseMeterContext *s, AVFrame *insamples, int out_phase_measurement)
{
int64_t out_phase_duration;
if (!s->is_out_phase && out_phase_measurement) {
s->is_out_phase = 1;
s->start_out_phase_presence = 1;
s->out_phase_idx[0] = insamples->pts;
}
if (s->is_out_phase && out_phase_measurement && s->start_out_phase_presence) {
s->out_phase_idx[1] = s->frame_end;
out_phase_duration = get_duration(s->out_phase_idx);
if (out_phase_duration >= s->duration) {
add_metadata(insamples, "out_phase_start", av_ts2timestr(s->out_phase_idx[0], &s->time_base));
av_log(s, AV_LOG_INFO, "out_phase_start: %s\n", av_ts2timestr(s->out_phase_idx[0], &s->time_base));
s->start_out_phase_presence = 0;
}
}
if (s->is_out_phase && !out_phase_measurement) {
s->out_phase_idx[1] = insamples ? insamples->pts : s->frame_end;
out_phase_duration = get_duration(s->out_phase_idx);
if (out_phase_duration >= s->duration) {
if (insamples) {
add_metadata(insamples, "out_phase_end", av_ts2timestr(s->out_phase_idx[1], &s->time_base));
add_metadata(insamples, "out_phase_duration", av_ts2timestr(out_phase_duration, &s->time_base));
}
av_log(s, AV_LOG_INFO, "out_phase_end: %s | out_phase_duration: %s\n", av_ts2timestr(s->out_phase_idx[1], &s->time_base), av_ts2timestr(out_phase_duration, &s->time_base));
}
s->is_out_phase = 0;
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
@ -154,6 +249,10 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
AVFrame *out;
uint8_t *dst;
int i;
int mono_measurement;
int out_phase_measurement;
float tolerance = 1.0f - s->tolerance;
float angle = cosf(s->angle/180.0f*M_PI);
if (s->do_video && (!s->out || s->out->width != outlink->w ||
s->out->height != outlink->h)) {
@ -193,6 +292,7 @@ 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) {
@ -209,7 +309,19 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
uint8_t value[128];
snprintf(value, sizeof(value), "%f", fphase);
av_dict_set(metadata, "lavfi.aphasemeter.phase", value, 0);
add_metadata(in, "phase", value);
}
if (s->do_phasing_detection) {
s->time_base = inlink->time_base;
s->frame_end = in->pts + av_rescale_q(in->nb_samples,
(AVRational){ 1, in->sample_rate }, inlink->time_base);
mono_measurement = (tolerance - fphase) < FLT_EPSILON;
out_phase_measurement = (angle - fphase) > FLT_EPSILON;
update_mono_detection(s, in, mono_measurement);
update_out_phase_detection(s, in, out_phase_measurement);
}
if (s->do_video) {
@ -228,6 +340,10 @@ static av_cold void uninit(AVFilterContext *ctx)
{
AudioPhaseMeterContext *s = ctx->priv;
if (s->do_phasing_detection) {
update_mono_detection(s, NULL, 0);
update_out_phase_detection(s, NULL, 0);
}
av_frame_free(&s->out);
}