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