mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-26 19:51:11 +00:00
cutter: bring cutter somewhat into this millennium
This commit is contained in:
Wim Taymans
parent
c1abdd7626
commit
5e3a52f1d9
2 changed files with 83 additions and 68 deletions
|
|
@ -100,10 +100,9 @@ static void gst_cutter_set_property (GObject * object, guint prop_id,
|
|||
static void gst_cutter_get_property (GObject * object, guint prop_id,
|
||||
GValue * value, GParamSpec * pspec);
|
||||
|
||||
static gboolean gst_cutter_event (GstPad * pad, GstEvent * event);
|
||||
static GstFlowReturn gst_cutter_chain (GstPad * pad, GstBuffer * buffer);
|
||||
|
||||
static gboolean gst_cutter_get_caps (GstPad * pad, GstCutter * filter);
|
||||
|
||||
static void
|
||||
gst_cutter_class_init (GstCutterClass * klass)
|
||||
{
|
||||
|
|
@ -156,8 +155,15 @@ gst_cutter_init (GstCutter * filter)
|
|||
{
|
||||
filter->sinkpad =
|
||||
gst_pad_new_from_static_template (&cutter_sink_factory, "sink");
|
||||
gst_pad_set_chain_function (filter->sinkpad, gst_cutter_chain);
|
||||
gst_pad_set_event_function (filter->sinkpad, gst_cutter_event);
|
||||
gst_pad_use_fixed_caps (filter->sinkpad);
|
||||
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
|
||||
|
||||
filter->srcpad =
|
||||
gst_pad_new_from_static_template (&cutter_src_factory, "src");
|
||||
gst_pad_use_fixed_caps (filter->srcpad);
|
||||
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
|
||||
|
||||
filter->threshold_level = CUTTER_DEFAULT_THRESHOLD_LEVEL;
|
||||
filter->threshold_length = CUTTER_DEFAULT_THRESHOLD_LENGTH;
|
||||
|
|
@ -169,13 +175,6 @@ gst_cutter_init (GstCutter * filter)
|
|||
filter->pre_run_length = 0 * GST_SECOND;
|
||||
filter->pre_buffer = NULL;
|
||||
filter->leaky = FALSE;
|
||||
|
||||
gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad);
|
||||
gst_pad_set_chain_function (filter->sinkpad, gst_cutter_chain);
|
||||
gst_pad_use_fixed_caps (filter->sinkpad);
|
||||
|
||||
gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad);
|
||||
gst_pad_use_fixed_caps (filter->srcpad);
|
||||
}
|
||||
|
||||
static GstMessage *
|
||||
|
|
@ -223,51 +222,86 @@ gst_cutter_calculate_##TYPE (TYPE * in, guint num, \
|
|||
DEFINE_CUTTER_CALCULATOR (gint16, 15);
|
||||
DEFINE_CUTTER_CALCULATOR (gint8, 7);
|
||||
|
||||
static gboolean
|
||||
gst_cutter_setcaps (GstCutter * filter, GstCaps * caps)
|
||||
{
|
||||
GstAudioInfo info;
|
||||
|
||||
if (!gst_audio_info_from_caps (&info, caps))
|
||||
return FALSE;
|
||||
|
||||
filter->info = info;
|
||||
|
||||
return gst_pad_set_caps (filter->srcpad, caps);
|
||||
}
|
||||
|
||||
static gboolean
|
||||
gst_cutter_event (GstPad * pad, GstEvent * event)
|
||||
{
|
||||
gboolean ret;
|
||||
GstCutter *filter;
|
||||
|
||||
filter = GST_CUTTER (GST_OBJECT_PARENT (pad));
|
||||
|
||||
switch (GST_EVENT_TYPE (event)) {
|
||||
case GST_EVENT_CAPS:
|
||||
{
|
||||
GstCaps *caps;
|
||||
|
||||
gst_event_parse_caps (event, &caps);
|
||||
ret = gst_cutter_setcaps (filter, caps);
|
||||
break;
|
||||
}
|
||||
default:
|
||||
ret = gst_pad_event_default (pad, event);
|
||||
break;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static GstFlowReturn
|
||||
gst_cutter_chain (GstPad * pad, GstBuffer * buf)
|
||||
{
|
||||
GstFlowReturn ret = GST_FLOW_OK;
|
||||
GstCutter *filter;
|
||||
gint16 *in_data;
|
||||
gint bpf, rate;
|
||||
gsize in_size;
|
||||
guint num_samples;
|
||||
gdouble NCS = 0.0; /* Normalized Cumulative Square of buffer */
|
||||
gdouble RMS = 0.0; /* RMS of signal in buffer */
|
||||
gdouble NMS = 0.0; /* Normalized Mean Square of buffer */
|
||||
GstBuffer *prebuf; /* pointer to a prebuffer element */
|
||||
|
||||
g_return_val_if_fail (pad != NULL, GST_FLOW_ERROR);
|
||||
g_return_val_if_fail (GST_IS_PAD (pad), GST_FLOW_ERROR);
|
||||
g_return_val_if_fail (buf != NULL, GST_FLOW_ERROR);
|
||||
GstClockTime duration;
|
||||
|
||||
filter = GST_CUTTER (GST_OBJECT_PARENT (pad));
|
||||
g_return_val_if_fail (filter != NULL, GST_FLOW_ERROR);
|
||||
g_return_val_if_fail (GST_IS_CUTTER (filter), GST_FLOW_ERROR);
|
||||
|
||||
if (!filter->have_caps) {
|
||||
if (!(gst_cutter_get_caps (pad, filter)))
|
||||
return GST_FLOW_NOT_NEGOTIATED;
|
||||
}
|
||||
if (GST_AUDIO_INFO_FORMAT (&filter->info) == GST_AUDIO_FORMAT_UNKNOWN)
|
||||
goto not_negotiated;
|
||||
|
||||
bpf = GST_AUDIO_INFO_BPF (&filter->info);
|
||||
rate = GST_AUDIO_INFO_RATE (&filter->info);
|
||||
|
||||
in_data = gst_buffer_map (buf, &in_size, NULL, GST_MAP_READ);
|
||||
|
||||
in_data = (gint16 *) gst_buffer_map (buf, &in_size, NULL, GST_MAP_READ);
|
||||
GST_LOG_OBJECT (filter, "length of prerec buffer: %" GST_TIME_FORMAT,
|
||||
GST_TIME_ARGS (filter->pre_run_length));
|
||||
|
||||
/* calculate mean square value on buffer */
|
||||
switch (filter->width) {
|
||||
case 16:
|
||||
switch (GST_AUDIO_INFO_FORMAT (&filter->info)) {
|
||||
case GST_AUDIO_FORMAT_S16:
|
||||
num_samples = in_size / 2;
|
||||
gst_cutter_calculate_gint16 (in_data, num_samples, &NCS);
|
||||
NMS = NCS / num_samples;
|
||||
break;
|
||||
case 8:
|
||||
case GST_AUDIO_FORMAT_S8:
|
||||
num_samples = in_size;
|
||||
gst_cutter_calculate_gint8 ((gint8 *) in_data, num_samples, &NCS);
|
||||
NMS = NCS / num_samples;
|
||||
break;
|
||||
default:
|
||||
/* this shouldn't happen */
|
||||
g_warning ("no mean square function for width %d\n", filter->width);
|
||||
g_warning ("no mean square function for format");
|
||||
break;
|
||||
}
|
||||
|
||||
|
|
@ -275,18 +309,17 @@ gst_cutter_chain (GstPad * pad, GstBuffer * buf)
|
|||
|
||||
filter->silent_prev = filter->silent;
|
||||
|
||||
duration = gst_util_uint64_scale (in_size / bpf, GST_SECOND, rate);
|
||||
|
||||
RMS = sqrt (NMS);
|
||||
/* if RMS below threshold, add buffer length to silent run length count
|
||||
* if not, reset
|
||||
*/
|
||||
GST_LOG_OBJECT (filter, "buffer stats: NMS %f, RMS %f, audio length %f", NMS,
|
||||
RMS,
|
||||
gst_guint64_to_gdouble (gst_audio_duration_from_pad_buffer
|
||||
(filter->sinkpad, buf)));
|
||||
RMS, gst_guint64_to_gdouble (duration));
|
||||
|
||||
if (RMS < filter->threshold_level)
|
||||
filter->silent_run_length +=
|
||||
gst_guint64_to_gdouble (gst_audio_duration_from_pad_buffer
|
||||
(filter->sinkpad, buf));
|
||||
filter->silent_run_length += gst_guint64_to_gdouble (duration);
|
||||
else {
|
||||
filter->silent_run_length = 0 * GST_SECOND;
|
||||
filter->silent = FALSE;
|
||||
|
|
@ -315,6 +348,7 @@ gst_cutter_chain (GstPad * pad, GstBuffer * buf)
|
|||
/* first of all, flush current buffer */
|
||||
GST_DEBUG_OBJECT (filter, "flushing buffer of length %" GST_TIME_FORMAT,
|
||||
GST_TIME_ARGS (filter->pre_run_length));
|
||||
|
||||
while (filter->pre_buffer) {
|
||||
prebuf = (g_list_first (filter->pre_buffer))->data;
|
||||
filter->pre_buffer = g_list_remove (filter->pre_buffer, prebuf);
|
||||
|
|
@ -329,55 +363,39 @@ gst_cutter_chain (GstPad * pad, GstBuffer * buf)
|
|||
* or to the srcpad */
|
||||
if (filter->silent) {
|
||||
filter->pre_buffer = g_list_append (filter->pre_buffer, buf);
|
||||
filter->pre_run_length +=
|
||||
gst_guint64_to_gdouble (gst_audio_duration_from_pad_buffer
|
||||
(filter->sinkpad, buf));
|
||||
filter->pre_run_length += gst_guint64_to_gdouble (duration);
|
||||
|
||||
while (filter->pre_run_length > filter->pre_length) {
|
||||
GstClockTime pduration;
|
||||
gsize psize;
|
||||
|
||||
prebuf = (g_list_first (filter->pre_buffer))->data;
|
||||
g_assert (GST_IS_BUFFER (prebuf));
|
||||
|
||||
psize = gst_buffer_get_size (prebuf);
|
||||
pduration = gst_util_uint64_scale (psize / bpf, GST_SECOND, rate);
|
||||
|
||||
filter->pre_buffer = g_list_remove (filter->pre_buffer, prebuf);
|
||||
filter->pre_run_length -=
|
||||
gst_guint64_to_gdouble (gst_audio_duration_from_pad_buffer
|
||||
(filter->sinkpad, prebuf));
|
||||
filter->pre_run_length -= gst_guint64_to_gdouble (pduration);
|
||||
|
||||
/* only pass buffers if we don't leak */
|
||||
if (!filter->leaky)
|
||||
gst_pad_push (filter->srcpad, prebuf);
|
||||
ret = gst_pad_push (filter->srcpad, prebuf);
|
||||
else
|
||||
gst_buffer_unref (prebuf);
|
||||
}
|
||||
} else
|
||||
gst_pad_push (filter->srcpad, buf);
|
||||
ret = gst_pad_push (filter->srcpad, buf);
|
||||
|
||||
return GST_FLOW_OK;
|
||||
}
|
||||
return ret;
|
||||
|
||||
|
||||
static gboolean
|
||||
gst_cutter_get_caps (GstPad * pad, GstCutter * filter)
|
||||
{
|
||||
GstCaps *caps;
|
||||
GstStructure *structure;
|
||||
const gchar *format;
|
||||
|
||||
caps = gst_pad_get_current_caps (pad);
|
||||
if (!caps) {
|
||||
GST_INFO ("no caps on pad %s:%s", GST_DEBUG_PAD_NAME (pad));
|
||||
return FALSE;
|
||||
/* ERRORS */
|
||||
not_negotiated:
|
||||
{
|
||||
return GST_FLOW_NOT_NEGOTIATED;
|
||||
}
|
||||
structure = gst_caps_get_structure (caps, 0);
|
||||
|
||||
format = gst_structure_get_string (structure, "format");
|
||||
if (g_str_has_prefix (format, "S16"))
|
||||
filter->width = 16;
|
||||
else
|
||||
filter->width = 8;
|
||||
filter->have_caps = TRUE;
|
||||
|
||||
gst_caps_unref (caps);
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
|
||||
static void
|
||||
gst_cutter_set_property (GObject * object, guint prop_id,
|
||||
const GValue * value, GParamSpec * pspec)
|
||||
|
|
|
|||
|
|
@ -54,7 +54,6 @@ struct _GstCutter
|
|||
double threshold_level; /* level below which to cut */
|
||||
double threshold_length; /* how long signal has to remain
|
||||
* below this level before cutting */
|
||||
|
||||
double silent_run_length; /* how long has it been below threshold ? */
|
||||
gboolean silent;
|
||||
gboolean silent_prev;
|
||||
|
|
@ -64,9 +63,7 @@ struct _GstCutter
|
|||
GList *pre_buffer; /* list of GstBuffers in pre-record buffer */
|
||||
gboolean leaky; /* do we leak an overflowing prebuffer ? */
|
||||
|
||||
gboolean have_caps; /* did we get the needed caps yet ? */
|
||||
gint width; /* bit width of data */
|
||||
long max_sample; /* maximum sample value */
|
||||
GstAudioInfo info;
|
||||
};
|
||||
|
||||
struct _GstCutterClass
|
||||
|
|
|
|||
Loading…
Reference in a new issue