typedef struct SilenceDetectContext {
const AVClass *class;
double noise; ///< noise amplitude ratio
- double duration; ///< minimum duration of silence until notification
+ int64_t duration; ///< minimum duration of silence until notification
int mono; ///< mono mode : check each channel separately (default = check when ALL channels are silent)
int channels; ///< number of channels
- int independant_channels; ///< number of entries in following arrays (always 1 in mono mode)
+ int independent_channels; ///< number of entries in following arrays (always 1 in mono mode)
int64_t *nb_null_samples; ///< (array) current number of continuous zero samples
int64_t *start; ///< (array) if silence is detected, this value contains the time of the first zero sample (default/unset = INT64_MIN)
int64_t frame_end; ///< pts of the end of the current frame (used to compute duration of silence at EOS)
AVRational time_base);
} SilenceDetectContext;
+#define MAX_DURATION (24*3600*1000000LL)
#define OFFSET(x) offsetof(SilenceDetectContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
static const AVOption silencedetect_options[] = {
{ "n", "set noise tolerance", OFFSET(noise), AV_OPT_TYPE_DOUBLE, {.dbl=0.001}, 0, DBL_MAX, FLAGS },
{ "noise", "set noise tolerance", OFFSET(noise), AV_OPT_TYPE_DOUBLE, {.dbl=0.001}, 0, DBL_MAX, FLAGS },
- { "d", "set minimum duration in seconds", OFFSET(duration), AV_OPT_TYPE_DOUBLE, {.dbl=2.}, 0, 24*60*60, FLAGS },
- { "duration", "set minimum duration in seconds", OFFSET(duration), AV_OPT_TYPE_DOUBLE, {.dbl=2.}, 0, 24*60*60, FLAGS },
- { "mono", "check each channel separately", OFFSET(mono), AV_OPT_TYPE_BOOL, {.i64=0.}, 0, 1, FLAGS },
+ { "d", "set minimum duration in seconds", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=2000000}, 0, MAX_DURATION,FLAGS },
+ { "duration", "set minimum duration in seconds", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=2000000}, 0, MAX_DURATION,FLAGS },
+ { "mono", "check each channel separately", OFFSET(mono), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
+ { "m", "check each channel separately", OFFSET(mono), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ NULL }
};
int is_silence, int current_sample, int64_t nb_samples_notify,
AVRational time_base)
{
- int channel = current_sample % s->independant_channels;
+ int channel = current_sample % s->independent_channels;
if (is_silence) {
if (s->start[channel] == INT64_MIN) {
s->nb_null_samples[channel]++;
if (s->nb_null_samples[channel] >= nb_samples_notify) {
- s->start[channel] = insamples->pts + av_rescale_q(current_sample / s->channels + 1 - nb_samples_notify * s->independant_channels / s->channels,
+ s->start[channel] = insamples->pts + av_rescale_q(current_sample / s->channels + 1 - nb_samples_notify * s->independent_channels / s->channels,
(AVRational){ 1, s->last_sample_rate }, time_base);
set_meta(insamples, s->mono ? channel + 1 : 0, "silence_start",
av_ts2timestr(s->start[channel], &time_base));
int c;
s->channels = inlink->channels;
- s->independant_channels = s->mono ? s->channels : 1;
- s->nb_null_samples = av_mallocz_array(sizeof(*s->nb_null_samples), s->independant_channels);
+ s->duration = av_rescale(s->duration, inlink->sample_rate, AV_TIME_BASE);
+ s->independent_channels = s->mono ? s->channels : 1;
+ s->nb_null_samples = av_mallocz_array(sizeof(*s->nb_null_samples), s->independent_channels);
if (!s->nb_null_samples)
return AVERROR(ENOMEM);
- s->start = av_malloc_array(sizeof(*s->start), s->independant_channels);
+ s->start = av_malloc_array(sizeof(*s->start), s->independent_channels);
if (!s->start)
return AVERROR(ENOMEM);
- for (c = 0; c < s->independant_channels; c++)
+ for (c = 0; c < s->independent_channels; c++)
s->start[c] = INT64_MIN;
switch (inlink->format) {
const int nb_channels = inlink->channels;
const int srate = inlink->sample_rate;
const int nb_samples = insamples->nb_samples * nb_channels;
- const int64_t nb_samples_notify = srate * s->duration * (s->mono ? 1 : nb_channels);
+ const int64_t nb_samples_notify = s->duration * (s->mono ? 1 : nb_channels);
int c;
// scale number of null samples to the new sample rate
if (s->last_sample_rate && s->last_sample_rate != srate)
- for (c = 0; c < s->independant_channels; c++) {
+ for (c = 0; c < s->independent_channels; c++) {
s->nb_null_samples[c] = srate * s->nb_null_samples[c] / s->last_sample_rate;
}
s->last_sample_rate = srate;
s->frame_end = insamples->pts + av_rescale_q(insamples->nb_samples,
(AVRational){ 1, s->last_sample_rate }, inlink->time_base);
- // TODO: document metadata
s->silencedetect(s, insamples, nb_samples, nb_samples_notify,
inlink->time_base);
SilenceDetectContext *s = ctx->priv;
int c;
- for (c = 0; c < s->independant_channels; c++)
+ for (c = 0; c < s->independent_channels; c++)
if (s->start[c] > INT64_MIN)
update(s, NULL, 0, c, 0, s->time_base);
av_freep(&s->nb_null_samples);
{ NULL }
};
-AVFilter ff_af_silencedetect = {
+const AVFilter ff_af_silencedetect = {
.name = "silencedetect",
.description = NULL_IF_CONFIG_SMALL("Detect silence."),
.priv_size = sizeof(SilenceDetectContext),