diff options
| -rw-r--r-- | ext/ladspa/gstsignalprocessor.c | 704 | ||||
| -rw-r--r-- | ext/ladspa/gstsignalprocessor.h | 95 |
2 files changed, 799 insertions, 0 deletions
diff --git a/ext/ladspa/gstsignalprocessor.c b/ext/ladspa/gstsignalprocessor.c new file mode 100644 index 00000000..4b9bcb9d --- /dev/null +++ b/ext/ladspa/gstsignalprocessor.c @@ -0,0 +1,704 @@ +/* GStreamer + * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> + * 2000 Wim Taymans <wtay@chello.be> + * 2005 Wim Taymans <wim@fluendo.com> + * + * gstsignalprocessor.c: + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + + +#include <stdlib.h> + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <gst/audio/audio.h> +#include "gstsignalprocessor.h" + + +GST_DEBUG_CATEGORY_STATIC (gst_signal_processor_debug); +#define GST_CAT_DEFAULT gst_signal_processor_debug + + +static GstStaticCaps template_caps = +GST_STATIC_CAPS (GST_AUDIO_FLOAT_STANDARD_PAD_TEMPLATE_CAPS); + +#define GST_TYPE_SIGNAL_PROCESSOR_PAD_TEMPLATE \ + (gst_signal_processor_pad_template_get_type ()) +#define GST_SIGNAL_PROCESSOR_PAD_TEMPLATE(obj) \ + (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SIGNAL_PROCESSOR_PAD_TEMPLATE,\ + GstSignalProcessorPadTemplate)) +typedef struct _GstSignalProcessorPadTemplate GstSignalProcessorPadTemplate; +typedef GstPadTemplateClass GstSignalProcessorPadTemplateClass; + +struct _GstSignalProcessorPadTemplate +{ + GstPadTemplate parent; + + guint index; +}; + +static GType +gst_signal_processor_pad_template_get_type (void) +{ + static GType type = 0; + + if (!type) { + static const GTypeInfo info = { + sizeof (GstSignalProcessorPadTemplateClass), NULL, NULL, NULL, NULL, + NULL, sizeof (GstSignalProcessorPadTemplate), 0, NULL + }; + + type = g_type_register_static (GST_TYPE_PAD_TEMPLATE, + "GstSignalProcessorPadTemplate", &info, 0); + } + return type; +} + +void +gst_signal_processor_class_add_pad_template (GstSignalProcessorClass * klass, + const gchar * name, GstPadDirection direction, guint index) +{ + GstPadTemplate *new; + + g_return_if_fail (GST_IS_SIGNAL_PROCESSOR_CLASS (klass)); + g_return_if_fail (name != NULL); + g_return_if_fail (direction == GST_PAD_SRC || direction == GST_PAD_SINK); + + new = g_object_new (gst_signal_processor_pad_template_get_type (), + "name", name, NULL); + + GST_PAD_TEMPLATE_NAME_TEMPLATE (new) = g_strdup (name); + GST_PAD_TEMPLATE_DIRECTION (new) = direction; + GST_PAD_TEMPLATE_PRESENCE (new) = GST_PAD_ALWAYS; + GST_PAD_TEMPLATE_CAPS (new) = gst_caps_copy (gst_static_caps_get + (&template_caps)); + GST_SIGNAL_PROCESSOR_PAD_TEMPLATE (new)->index = index; + + gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass), new); + gst_object_unref (new); +} + + +#define GST_TYPE_SIGNAL_PROCESSOR_PAD (gst_signal_processor_pad_get_type ()) +#define GST_SIGNAL_PROCESSOR_PAD(obj) \ + (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SIGNAL_PROCESSOR_PAD,\ + GstSignalProcessorPad)) +typedef struct _GstSignalProcessorPad GstSignalProcessorPad; +typedef GstPadClass GstSignalProcessorPadClass; + +struct _GstSignalProcessorPad +{ + GstPad parent; + + GstBuffer *pen; + + guint index; +}; + +static GType +gst_signal_processor_pad_get_type (void) +{ + static GType type = 0; + + if (!type) { + static const GTypeInfo info = { + sizeof (GstSignalProcessorPadClass), NULL, NULL, NULL, NULL, + NULL, sizeof (GstSignalProcessorPad), 0, NULL + }; + + type = g_type_register_static (GST_TYPE_PAD, + "GstSignalProcessorPad", &info, 0); + } + return type; +} + + +GST_BOILERPLATE (GstSignalProcessor, gst_signal_processor, GstElement, + GST_TYPE_ELEMENT); + + +static void gst_signal_processor_finalize (GObject * object); +static void gst_signal_processor_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec); +static void gst_signal_processor_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec); +static gboolean gst_signal_processor_src_activate_pull (GstPad * pad, + gboolean active); +static gboolean gst_signal_processor_sink_activate_push (GstPad * pad, + gboolean active); +static GstElementStateReturn gst_signal_processor_change_state (GstElement * + element); + +static gboolean gst_signal_processor_event (GstPad * pad, GstEvent * event); +static GstFlowReturn gst_signal_processor_getrange (GstPad * pad, + guint64 offset, guint length, GstBuffer ** buffer); +static GstFlowReturn gst_signal_processor_chain (GstPad * pad, + GstBuffer * buffer); +static gboolean gst_signal_processor_setcaps (GstPad * pad, GstCaps * caps); + + +static void +gst_signal_processor_base_init (gpointer g_class) +{ + GST_DEBUG_CATEGORY_INIT (gst_signal_processor_debug, "gst-dsp", 0, + "signalprocessor element"); +} + +static void +gst_signal_processor_class_init (GstSignalProcessorClass * klass) +{ + GObjectClass *gobject_class; + GstElementClass *gstelement_class; + + gobject_class = G_OBJECT_CLASS (klass); + gstelement_class = GST_ELEMENT_CLASS (klass); + + gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_signal_processor_finalize); + gobject_class->set_property = + GST_DEBUG_FUNCPTR (gst_signal_processor_set_property); + gobject_class->get_property = + GST_DEBUG_FUNCPTR (gst_signal_processor_get_property); + + gstelement_class->change_state = + GST_DEBUG_FUNCPTR (gst_signal_processor_change_state); +} + +static void +gst_signal_processor_add_pad_from_template (GstSignalProcessor * self, + GstPadTemplate * templ) +{ + GstPad *new; + + new = g_object_new (GST_TYPE_PAD, "name", GST_OBJECT_NAME (templ), + "direction", templ->direction, "template", templ, NULL); + GST_SIGNAL_PROCESSOR_PAD (new)->index = + GST_SIGNAL_PROCESSOR_PAD_TEMPLATE (templ)->index; + + gst_pad_set_setcaps_function (new, + GST_DEBUG_FUNCPTR (gst_signal_processor_setcaps)); + + if (templ->direction == GST_PAD_SINK) { + gst_pad_set_event_function (new, + GST_DEBUG_FUNCPTR (gst_signal_processor_event)); + gst_pad_set_chain_function (new, + GST_DEBUG_FUNCPTR (gst_signal_processor_chain)); + gst_pad_set_activatepush_function (new, + GST_DEBUG_FUNCPTR (gst_signal_processor_sink_activate_push)); + } else { + gst_pad_set_getrange_function (new, + GST_DEBUG_FUNCPTR (gst_signal_processor_getrange)); + gst_pad_set_activatepull_function (new, + GST_DEBUG_FUNCPTR (gst_signal_processor_src_activate_pull)); + } + + gst_element_add_pad (GST_ELEMENT (self), new); +} + +static void +gst_signal_processor_init (GstSignalProcessor * self) +{ + GList *templates; + + GST_DEBUG ("gst_signal_processor_init"); + + templates = + gst_element_class_get_pad_template_list (GST_ELEMENT_GET_CLASS (self)); + + while (templates) { + GstPadTemplate *templ = GST_PAD_TEMPLATE (templates->data); + + gst_signal_processor_add_pad_from_template (self, templ); + templates = templates->next; + } +} + +static void +gst_signal_processor_finalize (GObject * object) +{ + G_OBJECT_CLASS (parent_class)->finalize (object); +} + +static gboolean +gst_signal_processor_setcaps (GstPad * pad, GstCaps * caps) +{ + GstSignalProcessor *self; + GstSignalProcessorClass *klass; + + self = GST_SIGNAL_PROCESSOR (GST_PAD_PARENT (pad)); + klass = GST_SIGNAL_PROCESSOR_GET_CLASS (self); + + if (caps != self->caps) { + GstStructure *s; + gint sample_rate, buffer_frames; + + s = gst_caps_get_structure (caps, 0); + if (!gst_structure_get_int (s, "rate", &sample_rate)) + return FALSE; + if (!gst_structure_get_int (s, "buffer-frames", &buffer_frames)) + return FALSE; + + if (!klass->setup (self, sample_rate, buffer_frames)) + return FALSE; + + self->sample_rate = sample_rate; + self->buffer_frames = buffer_frames; + } + + /* FIXME: handle was_active, etc */ + + return TRUE; +} + +static gboolean +gst_signal_processor_event (GstPad * pad, GstEvent * event) +{ + GstSignalProcessor *self; + GstSignalProcessorClass *bclass; + gboolean ret = FALSE; + gboolean unlock; + + self = GST_SIGNAL_PROCESSOR (GST_PAD_PARENT (pad)); + bclass = GST_SIGNAL_PROCESSOR_GET_CLASS (self); + + if (bclass->event) + bclass->event (self, event); + + unlock = FALSE; + + switch (GST_EVENT_TYPE (event)) { + case GST_EVENT_FLUSH_STOP: + case GST_EVENT_EOS: + GST_STREAM_LOCK (pad); + unlock = TRUE; + break; + default: + break; + } + ret = gst_pad_event_default (pad, event); + if (unlock) + GST_STREAM_UNLOCK (pad); + + return ret; +} + +static void +gst_signal_processor_process (GstSignalProcessor * self) +{ + GstElement *elem; + GList *l1, *l2; + GstSignalProcessorClass *klass; + + g_return_if_fail (self->pending_in == 0); + g_return_if_fail (self->pending_out == 0); + + /* arrange the output buffers */ + for (l1 = elem->sinkpads, l2 = elem->srcpads; l1 || l2; + l1 = l1->next, l2 = l2->next) { + GstSignalProcessorPad *srcpad, *sinkpad; + + if (!l2) { + /* the output buffers have been covered, yay */ + break; + } else if (!l1) { + /* need to alloc some output buffers */ + for (; l2; l2 = l2->next) { + GstFlowReturn ret; + + srcpad = (GstSignalProcessorPad *) l2->data; + + ret = gst_pad_alloc_buffer (GST_PAD (srcpad), -1, self->buffer_frames, + GST_PAD_CAPS (srcpad), &srcpad->pen); + + if (ret != GST_FLOW_OK) { + self->state = ret; + return; + } else { + self->audio_out[srcpad->index] = + (gfloat *) GST_BUFFER_DATA (srcpad->pen); + self->pending_out++; + } + } + break; + } else { + /* copy input to output */ + sinkpad = (GstSignalProcessorPad *) l1->data; + srcpad = (GstSignalProcessorPad *) l2->data; + + srcpad->pen = sinkpad->pen; + sinkpad->pen = NULL; + self->audio_out[srcpad->index] = (gfloat *) GST_BUFFER_DATA (srcpad->pen); + self->pending_out++; + } + } + + klass = GST_SIGNAL_PROCESSOR_GET_CLASS (self); + + klass->process (self, self->buffer_frames); + + /* free unneeded input buffers */ + + for (l1 = elem->sinkpads; l1; l1 = l1->next) { + GstSignalProcessorPad *sinkpad = (GstSignalProcessorPad *) l1->data; + + if (sinkpad->pen) { + gst_buffer_unref (sinkpad->pen); + sinkpad->pen = NULL; + } + } +} + +static void +gst_signal_processor_pen_buffer (GstSignalProcessor * self, GstPad * pad, + GstBuffer * buffer) +{ + GstSignalProcessorPad *spad = (GstSignalProcessorPad *) pad; + + if (spad->pen) { + g_critical ("Pad %s:%s already has penned buffer", + GST_DEBUG_PAD_NAME (pad)); + gst_buffer_unref (buffer); + return; + } + + /* keep the reference */ + spad->pen = buffer; + self->audio_in[spad->index] = (gfloat *) GST_BUFFER_DATA (buffer); + + g_assert (self->pending_in != 0); + + self->pending_in--; + + if (self->pending_in == 0) { + gst_signal_processor_process (self); + } +} + +static void +gst_signal_processor_flush (GstSignalProcessor * self) +{ + GList *pads; + + pads = GST_ELEMENT (self)->pads; + + for (pads = GST_ELEMENT (self)->pads; pads; pads = pads->next) { + GstSignalProcessorPad *spad = (GstSignalProcessorPad *) pads->data; + + if (spad->pen) { + gst_buffer_unref (spad->pen); + spad->pen = NULL; + } + } +} + +static void +gst_signal_processor_do_pulls (GstSignalProcessor * self) +{ + GList *sinkpads; + + /* not threadsafe atm */ + + sinkpads = GST_ELEMENT (self)->sinkpads; + + for (; sinkpads; sinkpads = sinkpads->next) { + GstSignalProcessorPad *spad = (GstSignalProcessorPad *) sinkpads->data; + GstFlowReturn ret = GST_FLOW_OK; + GstBuffer *buf; + + if (spad->pen) { + g_warning ("Unexpectedly full buffer pen for pad %s:%s", + GST_DEBUG_PAD_NAME (spad)); + continue; + } + + ret = gst_pad_pull_range (GST_PAD (spad), -1, self->buffer_frames, &buf); + + if (ret != GST_FLOW_OK) { + self->state = ret; + gst_signal_processor_flush (self); + return; + } else if (!buf) { + g_critical ("Pull failed to make a buffer!"); + self->state = GST_FLOW_ERROR; + return; + } else { + gst_signal_processor_pen_buffer (self, GST_PAD (spad), buf); + } + } + + if (self->pending_in != 0) { + g_critical ("Something wierd happened..."); + self->state = GST_FLOW_ERROR; + } else { + gst_signal_processor_process (self); + } +} + +static GstFlowReturn +gst_signal_processor_getrange (GstPad * pad, guint64 offset, + guint length, GstBuffer ** buffer) +{ + GstSignalProcessor *self; + GstSignalProcessorPad *spad = (GstSignalProcessorPad *) pad; + GstFlowReturn ret; + + self = GST_SIGNAL_PROCESSOR (GST_PAD_PARENT (pad)); + + GST_STREAM_LOCK (pad); + + if (spad->pen) { + *buffer = spad->pen; + spad->pen = NULL; + g_assert (self->pending_out != 0); + self->pending_out--; + ret = GST_FLOW_OK; + } else { + gst_signal_processor_do_pulls (self); + if (!spad->pen) { + *buffer = NULL; + ret = self->state; + } else { + *buffer = spad->pen; + spad->pen = NULL; + self->pending_out--; + ret = GST_FLOW_OK; + } + } + + GST_STREAM_UNLOCK (pad); + + return ret; +} + +static void +gst_signal_processor_do_pushes (GstSignalProcessor * self) +{ + GList *srcpads; + + /* not threadsafe atm */ + + srcpads = GST_ELEMENT (self)->srcpads; + + for (; srcpads; srcpads = srcpads->next) { + GstSignalProcessorPad *spad = (GstSignalProcessorPad *) srcpads->data; + GstFlowReturn ret = GST_FLOW_OK; + + if (!spad->pen) { + g_warning ("Unexpectedly empty buffer pen for pad %s:%s", + GST_DEBUG_PAD_NAME (spad)); + continue; + } + + ret = gst_pad_push (GST_PAD (spad), spad->pen); + + if (ret != GST_FLOW_OK) { + self->state = ret; + gst_signal_processor_flush (self); + return; + } else { + spad->pen = NULL; + g_assert (self->pending_out > 0); + self->pending_out--; + } + } + + if (self->pending_out != 0) { + g_critical ("Something wierd happened..."); + self->state = GST_FLOW_ERROR; + } +} + +static GstFlowReturn +gst_signal_processor_chain (GstPad * pad, GstBuffer * buffer) +{ + GstSignalProcessor *self; + + self = GST_SIGNAL_PROCESSOR (GST_PAD_PARENT (pad)); + + GST_STREAM_LOCK (pad); + + gst_signal_processor_pen_buffer (self, pad, buffer); + + if (self->pending_in == 0) { + gst_signal_processor_process (self); + + gst_signal_processor_do_pushes (self); + } + + GST_STREAM_UNLOCK (pad); + + return self->state; +} + +static void +gst_signal_processor_set_property (GObject * object, guint prop_id, + const GValue * value, GParamSpec * pspec) +{ + /* GstSignalProcessor *self = GST_SIGNAL_PROCESSOR (object); */ + + switch (prop_id) { + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +gst_signal_processor_get_property (GObject * object, guint prop_id, + GValue * value, GParamSpec * pspec) +{ + /* GstSignalProcessor *self = GST_SIGNAL_PROCESSOR (object); */ + + switch (prop_id) { + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static gboolean +gst_signal_processor_sink_activate_push (GstPad * pad, gboolean active) +{ + gboolean result = TRUE; + GstSignalProcessor *self; + GstSignalProcessorClass *bclass; + + self = GST_SIGNAL_PROCESSOR (GST_OBJECT_PARENT (pad)); + bclass = GST_SIGNAL_PROCESSOR_GET_CLASS (self); + + if (active) { + if (self->mode == GST_ACTIVATE_NONE) { + self->mode = GST_ACTIVATE_PUSH; + result = TRUE; + } else if (self->mode == GST_ACTIVATE_PUSH) { + result = TRUE; + } else { + g_warning ("foo"); + result = FALSE; + } + } else { + if (self->mode == GST_ACTIVATE_NONE) { + result = TRUE; + } else if (self->mode == GST_ACTIVATE_PUSH) { + self->mode = GST_ACTIVATE_NONE; + result = TRUE; + } else { + g_warning ("foo"); + result = FALSE; + } + } + + return result; +} + +static gboolean +gst_signal_processor_src_activate_pull (GstPad * pad, gboolean active) +{ + gboolean result = TRUE; + GstSignalProcessor *self; + GstSignalProcessorClass *bclass; + + self = GST_SIGNAL_PROCESSOR (GST_OBJECT_PARENT (pad)); + bclass = GST_SIGNAL_PROCESSOR_GET_CLASS (self); + + if (active) { + if (self->mode == GST_ACTIVATE_NONE) { + GList *l; + + for (l = GST_ELEMENT (self)->sinkpads; l; l = l->next) + result &= gst_pad_activate_pull (pad, active); + if (result) + self->mode = GST_ACTIVATE_PULL; + } else if (self->mode == GST_ACTIVATE_PULL) { + result = TRUE; + } else { + g_warning ("foo"); + result = FALSE; + } + } else { + if (self->mode == GST_ACTIVATE_NONE) { + result = TRUE; + } else if (self->mode == GST_ACTIVATE_PULL) { + GList *l; + + for (l = GST_ELEMENT (self)->sinkpads; l; l = l->next) + result &= gst_pad_activate_pull (pad, active); + if (result) + self->mode = GST_ACTIVATE_NONE; + result = TRUE; + } else { + g_warning ("foo"); + result = FALSE; + } + } + + return result; +} + +static GstElementStateReturn +gst_signal_processor_change_state (GstElement * element) +{ + GstSignalProcessor *self; + GstSignalProcessorClass *klass; + GstElementState transition; + GstElementStateReturn result; + + self = GST_SIGNAL_PROCESSOR (element); + klass = GST_SIGNAL_PROCESSOR_GET_CLASS (self); + + transition = GST_STATE_TRANSITION (element); + + switch (transition) { + case GST_STATE_NULL_TO_READY: + self->audio_in = g_new0 (gfloat *, klass->num_audio_in); + self->control_in = g_new0 (gfloat, klass->num_control_in); + self->audio_out = g_new0 (gfloat *, klass->num_audio_out); + self->control_out = g_new0 (gfloat, klass->num_control_out); + break; + case GST_STATE_READY_TO_PAUSED: + break; + case GST_STATE_PAUSED_TO_PLAYING: + break; + default: + break; + } + + result = GST_ELEMENT_CLASS (parent_class)->change_state (element); + + switch (transition) { + case GST_STATE_PLAYING_TO_PAUSED: + break; + case GST_STATE_PAUSED_TO_READY: + break; + case GST_STATE_READY_TO_NULL: + g_free (self->audio_in); + self->audio_in = NULL; + g_free (self->control_in); + self->control_in = NULL; + g_free (self->audio_out); + self->audio_out = NULL; + g_free (self->control_out); + self->control_out = NULL; + break; + default: + break; + } + + return result; +} diff --git a/ext/ladspa/gstsignalprocessor.h b/ext/ladspa/gstsignalprocessor.h new file mode 100644 index 00000000..fec8a7cd --- /dev/null +++ b/ext/ladspa/gstsignalprocessor.h @@ -0,0 +1,95 @@ +/* GStreamer + * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> + * 2005 Wim Taymans <wim@fluendo.com> + * + * gstsignalprocessor.h: + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ + + +#ifndef __GST_SIGNAL_PROCESSOR_H__ +#define __GST_SIGNAL_PROCESSOR_H__ + +#include <gst/gst.h> + +G_BEGIN_DECLS + + +#define GST_TYPE_SIGNAL_PROCESSOR (gst_signal_processor_get_type()) +#define GST_SIGNAL_PROCESSOR(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SIGNAL_PROCESSOR,GstSignalProcessor)) +#define GST_SIGNAL_PROCESSOR_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_SIGNAL_PROCESSOR,GstSignalProcessorClass)) +#define GST_SIGNAL_PROCESSOR_GET_CLASS(obj) \ + (G_TYPE_INSTANCE_GET_CLASS ((obj),GST_TYPE_SIGNAL_PROCESSOR,GstSignalProcessorClass)) +#define GST_IS_SIGNAL_PROCESSOR(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SIGNAL_PROCESSOR)) +#define GST_IS_SIGNAL_PROCESSOR_CLASS(obj)(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_SIGNAL_PROCESSOR)) + + +typedef struct _GstSignalProcessor GstSignalProcessor; +typedef struct _GstSignalProcessorClass GstSignalProcessorClass; + + +struct _GstSignalProcessor { + GstElement element; + + GstCaps *caps; + + guint sample_rate; + guint buffer_frames; + + GstFlowReturn state; + + GstActivateMode mode; + + guint pending_in; + guint pending_out; + + gfloat *control_in; + gfloat **audio_in; + gfloat *control_out; + gfloat **audio_out; +}; + +struct _GstSignalProcessorClass { + GstElementClass parent_class; + + /*< public >*/ + guint num_control_in; + guint num_audio_in; + guint num_control_out; + guint num_audio_out; + + /* virtual methods for subclasses */ + + gboolean (*setup) (GstSignalProcessor *self, guint sample_rate, + guint buffer_frames); + gboolean (*start) (GstSignalProcessor *self); + gboolean (*stop) (GstSignalProcessor *self); + gboolean (*process) (GstSignalProcessor *self, guint num_frames); + gboolean (*event) (GstSignalProcessor *self, GstEvent *event); +}; + + +GType gst_signal_processor_get_type (void); +void gst_signal_processor_class_add_pad_template (GstSignalProcessorClass *klass, + const gchar *name, GstPadDirection direction, guint index); + + + +G_END_DECLS + + +#endif /* __GST_SIGNAL_PROCESSOR_H__ */ |