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avfilter/af_silencedetect: support more sample formats 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-10-04 17:57:15 +00:00
parent 922596e3da
commit 9665217a75
1 changed files with 81 additions and 33 deletions
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114
libavfilter/af_silencedetect.c
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@ -32,13 +32,17 @@
#include "avfilter.h"
#include "internal.h"
typedef struct {
typedef struct SilenceDetectContext {
const AVClass *class;
double noise; ///< noise amplitude ratio
double duration; ///< minimum duration of silence until notification
int64_t nb_null_samples; ///< current number of continuous zero samples
int64_t start; ///< if silence is detected, this value contains the time of the first zero sample
int last_sample_rate; ///< last sample rate to check for sample rate changes
void (*silencedetect)(struct SilenceDetectContext *s, AVFrame *insamples,
int nb_samples, int64_t nb_samples_notify,
AVRational time_base);
} SilenceDetectContext;
#define OFFSET(x) offsetof(SilenceDetectContext, x)
@ -59,9 +63,78 @@ static char *get_metadata_val(AVFrame *insamples, const char *key)
return e && e->value ? e->value : NULL;
}
static av_always_inline void update(SilenceDetectContext *s, AVFrame *insamples,
int is_silence, int64_t nb_samples_notify,
AVRational time_base)
{
if (is_silence) {
if (!s->start) {
s->nb_null_samples++;
if (s->nb_null_samples >= nb_samples_notify) {
s->start = insamples->pts - (int64_t)(s->duration / av_q2d(time_base) + .5);
av_dict_set(&insamples->metadata, "lavfi.silence_start",
av_ts2timestr(s->start, &time_base), 0);
av_log(s, AV_LOG_INFO, "silence_start: %s\n",
get_metadata_val(insamples, "lavfi.silence_start"));
}
}
} else {
if (s->start) {
av_dict_set(&insamples->metadata, "lavfi.silence_end",
av_ts2timestr(insamples->pts, &time_base), 0);
av_dict_set(&insamples->metadata, "lavfi.silence_duration",
av_ts2timestr(insamples->pts - s->start, &time_base), 0);
av_log(s, AV_LOG_INFO,
"silence_end: %s | silence_duration: %s\n",
get_metadata_val(insamples, "lavfi.silence_end"),
get_metadata_val(insamples, "lavfi.silence_duration"));
}
s->nb_null_samples = s->start = 0;
}
}
#define SILENCE_DETECT(name, type) \
static void silencedetect_##name(SilenceDetectContext *s, AVFrame *insamples, \
int nb_samples, int64_t nb_samples_notify, \
AVRational time_base) \
{ \
const type *p = (const type *)insamples->data[0]; \
const type noise = s->noise; \
int i; \
\
for (i = 0; i < nb_samples; i++, p++) \
update(s, insamples, *p < noise && *p > -noise, \
nb_samples_notify, time_base); \
}
SILENCE_DETECT(dbl, double)
SILENCE_DETECT(flt, float)
SILENCE_DETECT(s32, int32_t)
SILENCE_DETECT(s16, int16_t)
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
SilenceDetectContext *s = ctx->priv;
switch (inlink->format) {
case AV_SAMPLE_FMT_DBL: s->silencedetect = silencedetect_dbl; break;
case AV_SAMPLE_FMT_FLT: s->silencedetect = silencedetect_flt; break;
case AV_SAMPLE_FMT_S32:
s->noise *= INT32_MAX;
s->silencedetect = silencedetect_s32;
break;
case AV_SAMPLE_FMT_S16:
s->noise *= INT16_MAX;
s->silencedetect = silencedetect_s16;
break;
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
{
int i;
SilenceDetectContext *s = inlink->dst->priv;
const int nb_channels = inlink->channels;
const int srate = inlink->sample_rate;
@ -73,38 +146,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
s->nb_null_samples = srate * s->nb_null_samples / s->last_sample_rate;
s->last_sample_rate = srate;
// TODO: support more sample formats
// TODO: document metadata
if (insamples->format == AV_SAMPLE_FMT_DBL) {
double *p = (double *)insamples->data[0];
for (i = 0; i < nb_samples; i++, p++) {
if (*p < s->noise && *p > -s->noise) {
if (!s->start) {
s->nb_null_samples++;
if (s->nb_null_samples >= nb_samples_notify) {
s->start = insamples->pts - (int64_t)(s->duration / av_q2d(inlink->time_base) + .5);
av_dict_set(&insamples->metadata, "lavfi.silence_start",
av_ts2timestr(s->start, &inlink->time_base), 0);
av_log(s, AV_LOG_INFO, "silence_start: %s\n",
get_metadata_val(insamples, "lavfi.silence_start"));
}
}
} else {
if (s->start) {
av_dict_set(&insamples->metadata, "lavfi.silence_end",
av_ts2timestr(insamples->pts, &inlink->time_base), 0);
av_dict_set(&insamples->metadata, "lavfi.silence_duration",
av_ts2timestr(insamples->pts - s->start, &inlink->time_base), 0);
av_log(s, AV_LOG_INFO,
"silence_end: %s | silence_duration: %s\n",
get_metadata_val(insamples, "lavfi.silence_end"),
get_metadata_val(insamples, "lavfi.silence_duration"));
}
s->nb_null_samples = s->start = 0;
}
}
}
s->silencedetect(s, insamples, nb_samples, nb_samples_notify,
inlink->time_base);
return ff_filter_frame(inlink->dst->outputs[0], insamples);
}
@ -115,6 +159,9 @@ static int query_formats(AVFilterContext *ctx)
AVFilterChannelLayouts *layouts = NULL;
static const enum AVSampleFormat sample_fmts[] = {
AV_SAMPLE_FMT_DBL,
AV_SAMPLE_FMT_FLT,
AV_SAMPLE_FMT_S32,
AV_SAMPLE_FMT_S16,
AV_SAMPLE_FMT_NONE
};
@ -140,6 +187,7 @@ static const AVFilterPad silencedetect_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }