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webrtcdsp: expose voice activity detection.

Browse source 
The element now exposes properties to enable and configure
voice activity detection, and posts "voice-activity" messages
when the return value of stream_has_voice () changes.

https://bugzilla.gnome.org/show_bug.cgi?id=779138
This commit is contained in:
Mathieu Duponchelle 2017-02-23 16:12:38 +01:00 committed by Nicolas Dufresne
parent 62d167b551
commit fc261bc38a
1 changed files with 129 additions and 1 deletions
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130
ext/webrtcdsp/gstwebrtcdsp.cpp
View file

@ -83,6 +83,9 @@ GST_DEBUG_CATEGORY (webrtc_dsp_debug);
#define DEFAULT_STARTUP_MIN_VOLUME 12
#define DEFAULT_LIMITER TRUE
#define DEFAULT_GAIN_CONTROL_MODE webrtc::GainControl::kAdaptiveDigital
#define DEFAULT_VOICE_DETECTION FALSE
#define DEFAULT_VOICE_DETECTION_FRAME_SIZE_MS 10
#define DEFAULT_VOICE_DETECTION_LIKELIHOOD webrtc::VoiceDetection::kLowLikelihood
static GstStaticPadTemplate gst_webrtc_dsp_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
@ -171,6 +174,28 @@ gst_webrtc_gain_control_mode_get_type (void)
return gain_control_mode_type;
}
typedef webrtc::VoiceDetection::Likelihood GstWebrtcVoiceDetectionLikelihood;
#define GST_TYPE_WEBRTC_VOICE_DETECTION_LIKELIHOOD \
(gst_webrtc_voice_detection_likelihood_get_type ())
static GType
gst_webrtc_voice_detection_likelihood_get_type (void)
{
static GType likelihood_type = 0;
static const GEnumValue likelihood_types[] = {
{webrtc::VoiceDetection::kVeryLowLikelihood, "Very Low Likelihood", "very-low"},
{webrtc::VoiceDetection::kLowLikelihood, "Low Likelihood", "low"},
{webrtc::VoiceDetection::kModerateLikelihood, "Moderate Likelihood", "moderate"},
{webrtc::VoiceDetection::kHighLikelihood, "High Likelihood", "high"},
{0, NULL, NULL}
};
if (!likelihood_type) {
likelihood_type =
g_enum_register_static ("GstWebrtcVoiceDetectionLikelihood", likelihood_types);
}
return likelihood_type;
}
enum
{
PROP_0,
@ -188,7 +213,10 @@ enum
PROP_COMPRESSION_GAIN_DB,
PROP_STARTUP_MIN_VOLUME,
PROP_LIMITER,
PROP_GAIN_CONTROL_MODE
PROP_GAIN_CONTROL_MODE,
PROP_VOICE_DETECTION,
PROP_VOICE_DETECTION_FRAME_SIZE_MS,
PROP_VOICE_DETECTION_LIKELIHOOD,
};
/**
@ -203,6 +231,7 @@ struct _GstWebrtcDsp
/* Protected by the object lock */
GstAudioInfo info;
guint period_size;
gboolean stream_has_voice;
/* Protected by the stream lock */
GstAdapter *adapter;
@ -227,6 +256,9 @@ struct _GstWebrtcDsp
gint startup_min_volume;
gboolean limiter;
webrtc::GainControl::Mode gain_control_mode;
gboolean voice_detection;
gint voice_detection_frame_size_ms;
webrtc::VoiceDetection::Likelihood voice_detection_likelihood;
};
G_DEFINE_TYPE (GstWebrtcDsp, gst_webrtc_dsp, GST_TYPE_AUDIO_FILTER);
@ -360,6 +392,28 @@ done:
return ret;
}
static void
gst_webrtc_vad_post_message (GstWebrtcDsp *self, GstClockTime timestamp,
gboolean stream_has_voice)
{
GstBaseTransform *trans = GST_BASE_TRANSFORM_CAST (self);
GstStructure *s;
GstClockTime stream_time;
stream_time = gst_segment_to_stream_time (&trans->segment, GST_FORMAT_TIME,
timestamp);
s = gst_structure_new ("voice-activity",
"stream-time", G_TYPE_UINT64, stream_time,
"stream-has-voice", G_TYPE_BOOLEAN, stream_has_voice, NULL);
GST_LOG_OBJECT (self, "Posting voice activity message, stream %s voice",
stream_has_voice ? "now has" : "no longer has");
gst_element_post_message (GST_ELEMENT (self),
gst_message_new_element (GST_OBJECT (self), s));
}
static GstFlowReturn
gst_webrtc_dsp_process_stream (GstWebrtcDsp * self,
GstBuffer * buffer)
@ -384,6 +438,14 @@ gst_webrtc_dsp_process_stream (GstWebrtcDsp * self,
GST_WARNING_OBJECT (self, "Failed to filter the audio: %s.",
webrtc_error_to_string (err));
} else {
if (self->voice_detection) {
gboolean stream_has_voice = apm->voice_detection ()->stream_has_voice ();
if (stream_has_voice != self->stream_has_voice)
gst_webrtc_vad_post_message (self, GST_BUFFER_PTS (buffer), stream_has_voice);
self->stream_has_voice = stream_has_voice;
}
memcpy (info.data, frame.data_, self->period_size);
}
@ -559,6 +621,23 @@ gst_webrtc_dsp_setup (GstAudioFilter * filter, const GstAudioInfo * info)
apm->gain_control ()->Enable (true);
}
if (self->voice_detection) {
GEnumClass *likelihood_class = (GEnumClass *)
g_type_class_ref (GST_TYPE_WEBRTC_VOICE_DETECTION_LIKELIHOOD);
GST_DEBUG_OBJECT (self, "Enabling Voice Activity Detection, frame size "
"%d milliseconds, likelihood: %s", self->voice_detection_frame_size_ms,
g_enum_get_value (likelihood_class,
self->voice_detection_likelihood)->value_name);
g_type_class_unref (likelihood_class);
self->stream_has_voice = FALSE;
apm->voice_detection ()->Enable (true);
apm->voice_detection ()->set_likelihood (self->voice_detection_likelihood);
apm->voice_detection ()->set_frame_size_ms (
self->voice_detection_frame_size_ms);
}
GST_OBJECT_UNLOCK (self);
return TRUE;
@ -668,6 +747,16 @@ gst_webrtc_dsp_set_property (GObject * object,
self->gain_control_mode =
(GstWebrtcGainControlMode) g_value_get_enum (value);
break;
case PROP_VOICE_DETECTION:
self->voice_detection = g_value_get_boolean (value);
break;
case PROP_VOICE_DETECTION_FRAME_SIZE_MS:
self->voice_detection_frame_size_ms = g_value_get_int (value);
break;
case PROP_VOICE_DETECTION_LIKELIHOOD:
self->voice_detection_likelihood =
(GstWebrtcVoiceDetectionLikelihood) g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -728,6 +817,15 @@ gst_webrtc_dsp_get_property (GObject * object,
case PROP_GAIN_CONTROL_MODE:
g_value_set_enum (value, self->gain_control_mode);
break;
case PROP_VOICE_DETECTION:
g_value_set_boolean (value, self->voice_detection);
break;
case PROP_VOICE_DETECTION_FRAME_SIZE_MS:
g_value_set_int (value, self->voice_detection_frame_size_ms);
break;
case PROP_VOICE_DETECTION_LIKELIHOOD:
g_value_set_enum (value, self->voice_detection_likelihood);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
@ -907,6 +1005,36 @@ gst_webrtc_dsp_class_init (GstWebrtcDspClass * klass)
DEFAULT_GAIN_CONTROL_MODE,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
g_object_class_install_property (gobject_class,
PROP_VOICE_DETECTION,
g_param_spec_boolean ("voice-detection", "Voice Detection",
"Enable or disable the voice activity detector",
DEFAULT_VOICE_DETECTION, (GParamFlags) (G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT)));
g_object_class_install_property (gobject_class,
PROP_VOICE_DETECTION_FRAME_SIZE_MS,
g_param_spec_int ("voice-detection-frame-size-ms",
"Voice Detection Frame Size Milliseconds",
"Sets the |size| of the frames in ms on which the VAD will operate. "
"Larger frames will improve detection accuracy, but reduce the "
"frequency of updates",
10, 30, DEFAULT_VOICE_DETECTION_FRAME_SIZE_MS,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
g_object_class_install_property (gobject_class,
PROP_VOICE_DETECTION_LIKELIHOOD,
g_param_spec_enum ("voice-detection-likelihood",
"Voice Detection Likelihood",
"Specifies the likelihood that a frame will be declared to contain "
"voice.",
GST_TYPE_WEBRTC_VOICE_DETECTION_LIKELIHOOD,
DEFAULT_VOICE_DETECTION_LIKELIHOOD,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
G_PARAM_CONSTRUCT)));
}
static gboolean