--- /dev/null
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ * 2000 Wim Taymans <wim.taymans@chello.be>
+ * 2001 Thomas <thomas@apestaart.org>
+ *
+ * adder.c: Adder element, N in, one out, samples are added
+ *
+ * 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 "gstadder.h"
+
+//#define DEBUG
+
+GstElementDetails adder_details = {
+ "Adder",
+ "Filter/Effect",
+ "2-to-1 audio adder/mixer",
+ VERSION,
+ "Thomas <thomas@apestaart.org>",
+ "(C) 2001",
+};
+
+/* Adder signals and args */
+enum {
+ /* FILL ME */
+ LAST_SIGNAL
+};
+
+enum {
+ ARG_0,
+ ARG_NUM_PADS,
+ /* FILL ME */
+};
+
+GST_PADTEMPLATE_FACTORY (adder_src_template_factory,
+ "src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_CAPS_NEW (
+ "test_src",
+ "audio/raw",
+ "format", GST_PROPS_STRING ("int"),
+ "law", GST_PROPS_INT (0),
+ "endianness", GST_PROPS_INT (G_BYTE_ORDER),
+ "signed", GST_PROPS_BOOLEAN (TRUE),
+ "width", GST_PROPS_INT_RANGE (8, 16),
+ "depth", GST_PROPS_INT_RANGE (8, 16),
+ "rate", GST_PROPS_INT_RANGE (4000, 48000), //FIXME
+ "channels", GST_PROPS_INT_RANGE (1, 2)
+ )
+);
+
+GST_PADTEMPLATE_FACTORY (adder_sink_template_factory,
+ "sink%d",
+ GST_PAD_SINK,
+ GST_PAD_REQUEST,
+ GST_CAPS_NEW (
+ "test_sink",
+ "audio/raw",
+ "format", GST_PROPS_STRING ("int"),
+ "law", GST_PROPS_INT (0),
+ "endianness", GST_PROPS_INT (G_BYTE_ORDER),
+ "signed", GST_PROPS_BOOLEAN (TRUE),
+ "width", GST_PROPS_INT_RANGE (8, 16),
+ "depth", GST_PROPS_INT_RANGE (8, 16),
+ "rate", GST_PROPS_INT_RANGE (4000, 48000), //FIXME
+ "channels", GST_PROPS_INT_RANGE (1, 2)
+ )
+);
+
+static void gst_adder_class_init (GstAdderClass *klass);
+static void gst_adder_init (GstAdder *adder);
+
+static void gst_adder_get_property (GObject *object, guint prop_id,
+ GValue *value, GParamSpec *pspec);
+
+static GstPad* gst_adder_request_new_pad (GstElement *element, GstPadTemplate *temp,
+ const gchar *unused);
+
+/* we do need a loop function */
+static void gst_adder_loop (GstElement *element);
+
+static GstElementClass *parent_class = NULL;
+//static guint gst_adder_signals[LAST_SIGNAL] = { 0 };
+
+GType
+gst_adder_get_type(void) {
+ static GType adder_type = 0;
+
+ if (!adder_type) {
+ static const GTypeInfo adder_info = {
+ sizeof(GstAdderClass), NULL,
+ NULL,
+ (GClassInitFunc)gst_adder_class_init,
+ NULL,
+ NULL,
+ sizeof(GstAdder),
+ 0,
+ (GInstanceInitFunc)gst_adder_init,
+ };
+ adder_type = g_type_register_static (GST_TYPE_ELEMENT, "GstAdder", &adder_info, 0);
+ }
+ return adder_type;
+}
+
+static void
+gst_adder_class_init (GstAdderClass *klass)
+{
+ GObjectClass *gobject_class;
+ GstElementClass *gstelement_class;
+
+ gobject_class = (GObjectClass*)klass;
+ gstelement_class = (GstElementClass*)klass;
+
+ parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
+
+ g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_NUM_PADS,
+ g_param_spec_int("num_pads","num_pads","num_pads",
+ G_MININT,G_MAXINT,0,G_PARAM_READABLE)); // CHECKME
+
+ gobject_class->get_property = gst_adder_get_property;
+
+ gstelement_class->request_new_pad = gst_adder_request_new_pad;
+}
+
+static void
+gst_adder_init (GstAdder *adder)
+{
+ adder->srcpad = gst_pad_new ("src", GST_PAD_SRC);
+ gst_element_add_pad (GST_ELEMENT (adder), adder->srcpad);
+ gst_element_set_loop_function (GST_ELEMENT (adder), gst_adder_loop);
+
+ /* keep track of the sinkpads requested */
+
+ adder->numsinkpads = 0;
+ adder->input_channels = NULL;
+}
+
+static GstPad*
+gst_adder_request_new_pad (GstElement *element, GstPadTemplate *templ, const gchar *unused)
+{
+ gchar *name;
+ adder_input_channel_t *input_channel;
+ GstAdder *adder;
+
+ g_return_val_if_fail (GST_IS_ADDER (element), NULL);
+
+ if (templ->direction != GST_PAD_SINK) {
+ g_warning ("gstadder: request new pad that is not a SINK pad\n");
+ return NULL;
+ }
+
+ adder = GST_ADDER (element);
+
+ /* allocate space for the input_channel */
+
+ input_channel = (adder_input_channel_t *) g_malloc (sizeof (adder_input_channel_t));
+ if (input_channel == NULL)
+ printf ("Could not allocate memory for adder input channel !\n");
+
+ /* fill in input_channel structure */
+
+ name = g_strdup_printf ("sink%d",adder->numsinkpads);
+ input_channel->sinkpad = gst_pad_new_from_template (templ, name);
+ gst_element_add_pad (GST_ELEMENT (adder), input_channel->sinkpad);
+ input_channel->bytes_waiting = 0;
+ input_channel->p_input_data = NULL;
+ input_channel->input_buffer = NULL;
+
+ /* add the input_channel to the list of input channels */
+
+ adder->input_channels = g_slist_append (adder->input_channels, input_channel);
+ adder->numsinkpads++;
+
+ return input_channel->sinkpad;
+}
+
+static void
+gst_adder_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+{
+ GstAdder *adder;
+
+ /* it's not null if we got it, but it might not be ours */
+ g_return_if_fail (GST_IS_ADDER (object));
+
+ adder = GST_ADDER (object);
+
+ switch (prop_id) {
+ case ARG_NUM_PADS:
+ g_value_set_int (value, adder->numsinkpads);
+ break;
+ default:
+ break;
+ }
+}
+
+
+/* use this loop */
+static void
+gst_adder_loop (GstElement *element)
+{
+ /*
+ * combine channels by adding sample values
+ * basic algorithm :
+ * - each input pipe has a bytes_waiting to it
+ * - repeat for each input pipe :
+ * - if bytes_waiting is zero, request a new buffer
+ * - check which input pipe has the smalles bytes_waiting
+ * - allocate an output buffer of that size
+ * - repeat for each input pipe :
+ * - get this much data from each of the input channels
+ * - clear each buffer that has been depleted completely and set it's value
+ * to 0
+ * - add this to the output buffer
+ * - push out the output buffer
+ */
+
+ GstAdder *adder;
+
+ GSList *p_input_channel_GSL;
+ adder_input_channel_t *p_input_channel;
+
+ GstBuffer *buf_in, *buf_out;
+ GstPad *sinkpad;
+
+ guint i;
+
+ guint pad_number, smallest_pad_size;
+
+ gint16 *data_out, *data_in;
+
+ g_return_if_fail (element != NULL);
+ g_return_if_fail (GST_IS_ADDER (element));
+
+ adder = GST_ADDER (element);
+
+ do
+ {
+
+#ifdef DEBUG
+ printf ("DEBUG : gst_adder_loop iteration\n");
+#endif
+
+ /* first, request all buffers that have a zero bytes_waiting value */
+
+
+#ifdef DEBUG
+ printf ("\tDEBUG : gst_adder_loop : getting needed input buffers\n");
+#endif
+
+ pad_number = 0;
+ p_input_channel_GSL = adder->input_channels;
+ smallest_pad_size = 0;
+
+ while (p_input_channel_GSL)
+ {
+ guint16 bw;
+
+ p_input_channel = (adder_input_channel_t *) p_input_channel_GSL->data;
+
+ ++pad_number;
+ bw = p_input_channel->bytes_waiting;
+ sinkpad = p_input_channel->sinkpad;
+
+#ifdef DEBUG
+ printf ("\tDEBUG : gst_adder_loop : input channel %d has %d bytes left\n",
+ pad_number, bw);
+#endif
+ if (bw == 0)
+ {
+ /* QUESTION : maybe free previous buffer ? where do we do this ? */
+
+ /* no more data left; get more */
+ buf_in = gst_pad_pull (sinkpad);
+ if (buf_in == NULL)
+ printf ("ERROR : could not get input buffer !\n");
+ bw = GST_BUFFER_SIZE (buf_in);
+ p_input_channel->bytes_waiting = bw;
+ p_input_channel->input_buffer = buf_in;
+ p_input_channel->p_input_data = (guint16 *) GST_BUFFER_DATA (buf_in);
+
+#ifdef DEBUG
+ printf ("\tDEBUG : gst_adder_loop : input channel %d got %d new bytes\n",
+ pad_number, bw);
+#endif
+ }
+ /* update smallest pad size */
+ if (smallest_pad_size == 0)
+ {
+ /* not set yet, set it ! */
+ smallest_pad_size = bw;
+ }
+ if (bw < smallest_pad_size) smallest_pad_size = bw;
+
+ p_input_channel_GSL = g_slist_next (p_input_channel_GSL);
+ }
+
+#ifdef DEBUG
+ printf ("\tDEBUG : gst_adder_loop : smallest pad size %d\n",
+ smallest_pad_size);
+#endif
+
+ /* get new output buffer */
+
+ buf_out = gst_buffer_new ();
+ if (buf_out == NULL)
+ printf ("ERROR : could not get new output buffer !\n");
+
+ GST_BUFFER_SIZE (buf_out) = smallest_pad_size;
+ GST_BUFFER_DATA (buf_out) = g_malloc0 (smallest_pad_size);
+
+ data_out = (guint16 *) GST_BUFFER_DATA (buf_out);
+ if (data_out == NULL)
+ printf ("ERROR : could not allocate output buffer !\n");
+
+ /* get data from all of the sinks */
+
+ pad_number = 0;
+ p_input_channel_GSL = adder->input_channels;
+
+ while (p_input_channel_GSL)
+ {
+ ++pad_number;
+ p_input_channel = (adder_input_channel_t *) p_input_channel_GSL->data;
+ data_out = (gint16 *) GST_BUFFER_DATA (buf_out);
+
+ data_in = p_input_channel->p_input_data;
+
+ /* add to the output buffer */
+ for (i = 0; i < smallest_pad_size / 2; ++i, ++data_out, ++data_in)
+ {
+ *data_out += *data_in;
+ }
+ /* adjust bytes_waiting and data pointer */
+ p_input_channel->bytes_waiting -= smallest_pad_size;
+ if (p_input_channel->bytes_waiting == 0)
+ {
+#ifdef DEBUG
+ printf ("\tDEBUG : gst_adder_loop : channel %d is empty, unref...\n",
+ pad_number);
+#endif
+ gst_buffer_unref (p_input_channel->input_buffer);
+ p_input_channel->p_input_data = NULL;
+ }
+ p_input_channel->p_input_data = data_in;
+
+ p_input_channel_GSL = g_slist_next (p_input_channel_GSL);
+ }
+
+ /* send it out */
+ GST_DEBUG (0, "pushing buf_out\n");
+ gst_pad_push (adder->srcpad, buf_out);
+ GST_DEBUG (0, "pushed buf_out\n");
+
+/* thomas : quick fix try */
+// GST_FLAG_SET (element, GST_ELEMENT_COTHREAD_STOPPING);
+ } while (!GST_ELEMENT_IS_COTHREAD_STOPPING (element));
+}
+
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+ GstElementFactory *factory;
+
+ factory = gst_elementfactory_new("adder",GST_TYPE_ADDER,
+ &adder_details);
+ g_return_val_if_fail(factory != NULL, FALSE);
+
+ gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (adder_src_template_factory));
+ gst_elementfactory_add_padtemplate (factory, GST_PADTEMPLATE_GET (adder_sink_template_factory));
+
+ gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+ return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+ GST_VERSION_MAJOR,
+ GST_VERSION_MINOR,
+ "adder",
+ plugin_init
+};
+
--- /dev/null
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ * 2000 Wim Taymans <wtay@chello.be>
+ *
+ * gstadder.h: Header for GstAdder element
+ *
+ * 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_ADDER_H__
+#define __GST_ADDER_H__
+
+#include <gst/gst.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+extern GstElementDetails gst_adder_details;
+
+#define GST_TYPE_ADDER \
+ (gst_adder_get_type())
+#define GST_ADDER(obj) \
+ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ADDER,GstAdder))
+#define GST_ADDER_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ADDER,GstAdderClass))
+#define GST_IS_ADDER(obj) \
+ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ADDER))
+#define GST_IS_ADDER_CLASS(obj) \
+ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ADDER))
+
+typedef struct _GstAdder GstAdder;
+typedef struct _GstAdderClass GstAdderClass;
+
+typedef struct {
+ GstPad *sinkpad;
+
+ GstBuffer *input_buffer; /* input buffer */
+ gint16 *p_input_data; /* pointer to current position in input buffer */
+ guint16 bytes_waiting; /* how many bytes are still left in input buffer ? */
+} adder_input_channel_t;
+
+struct _GstAdder {
+ GstElement element;
+
+ GstPad *srcpad;
+
+ /* keep track of the sinkpads */
+ gint numsinkpads;
+ GSList *input_channels;
+};
+
+struct _GstAdderClass {
+ GstElementClass parent_class;
+};
+
+GType gst_adder_get_type (void);
+
+gboolean gst_adder_factory_init (GstElementFactory *factory);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+
+#endif /* __GST_ADDER_H__ */
projects / platform / upstream / gst-plugins-base.git / commitdiff