--- /dev/null
+/* GStreamer
+ * Copyright (C) 2001 Erik Walthinsen <omega@temple-baptist.com>
+ *
+ * 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 "adapter.h"
+#include <string.h>
+
+/* default size for the assembled data buffer */
+#define DEFAULT_SIZE 16
+
+GST_DEBUG_CATEGORY_STATIC (gst_adapter_debug);
+#define GST_CAT_DEFAULT gst_adapter_debug
+
+#define _do_init(thing) \
+ GST_DEBUG_CATEGORY_INIT (gst_adapter_debug, "GstAdapter", 0, "object to splice and merge buffers to dewsired size")
+GST_BOILERPLATE_FULL (GstAdapter, gst_adapter, GObject, G_TYPE_OBJECT, _do_init)
+
+ static void gst_adapter_dispose (GObject * object);
+ static void gst_adapter_finalize (GObject * object);
+
+ static void gst_adapter_base_init (gpointer g_class)
+{
+}
+
+static void
+gst_adapter_class_init (GstAdapterClass * klass)
+{
+ GObjectClass *object = G_OBJECT_CLASS (klass);
+
+ object->dispose = gst_adapter_dispose;
+ object->finalize = gst_adapter_finalize;
+}
+
+static void
+gst_adapter_init (GstAdapter * adapter)
+{
+ adapter->assembled_data = g_malloc (DEFAULT_SIZE);
+ adapter->assembled_size = DEFAULT_SIZE;
+}
+
+static void
+gst_adapter_dispose (GObject * object)
+{
+ GstAdapter *adapter = GST_ADAPTER (object);
+
+ gst_adapter_clear (adapter);
+
+ GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
+}
+
+static void
+gst_adapter_finalize (GObject * object)
+{
+ GstAdapter *adapter = GST_ADAPTER (object);
+
+ g_free (adapter->assembled_data);
+
+ GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
+}
+
+/**
+ * gst_adapter_new:
+ *
+ * Creates a new #GstAdapter.
+ *
+ * Returns: a new #GstAdapter
+ */
+GstAdapter *
+gst_adapter_new (void)
+{
+ return g_object_new (GST_TYPE_ADAPTER, NULL);
+}
+
+/**
+ * gst_adapter_clear:
+ * @adapter: the #GstAdapter to clear
+ *
+ * Removes all buffers from the @adapter.
+ */
+void
+gst_adapter_clear (GstAdapter * adapter)
+{
+ g_return_if_fail (GST_IS_ADAPTER (adapter));
+
+ g_slist_foreach (adapter->buflist, (GFunc) gst_data_unref, NULL);
+ g_slist_free (adapter->buflist);
+ adapter->buflist = NULL;
+ adapter->size = 0;
+ adapter->skip = 0;
+ adapter->assembled_len = 0;
+}
+
+/**
+ * gst_adapter_push:
+ * @adapter: a #GstAdapter
+ * @buf: the #GstBuffer to queue into the adapter
+ *
+ * Adds the data from @buf to the data stored inside @adapter and takes
+ * ownership of the buffer.
+ */
+void
+gst_adapter_push (GstAdapter * adapter, GstBuffer * buf)
+{
+ g_return_if_fail (GST_IS_ADAPTER (adapter));
+ g_return_if_fail (GST_IS_BUFFER (buf));
+
+ adapter->size += GST_BUFFER_SIZE (buf);
+ adapter->buflist = g_slist_append (adapter->buflist, buf);
+}
+
+/**
+ * gst_adapter_peek:
+ * @adapter: a #GstAdapter
+ * @size: number of bytes to peek
+ *
+ * Gets the first @size bytes stored in the @adapter. If this many bytes are
+ * not available, it returns NULL. The returned pointer is valid until the next
+ * function is called on the adapter.
+ *
+ * Returns: a pointer to the first @size bytes of data or NULL
+ */
+const guint8 *
+gst_adapter_peek (GstAdapter * adapter, guint size)
+{
+ GstBuffer *cur;
+ GSList *cur_list;
+ guint copied;
+
+ g_return_val_if_fail (GST_IS_ADAPTER (adapter), NULL);
+ g_return_val_if_fail (size > 0, NULL);
+
+ if (size > adapter->size)
+ return NULL;
+
+ if (adapter->assembled_len >= size)
+ return adapter->assembled_data;
+
+ cur = adapter->buflist->data;
+ if (GST_BUFFER_SIZE (cur) >= size + adapter->skip)
+ return GST_BUFFER_DATA (cur) + adapter->skip;
+
+ if (adapter->assembled_size < size) {
+ adapter->assembled_size = (size / DEFAULT_SIZE + 1) * DEFAULT_SIZE;
+ GST_DEBUG_OBJECT (adapter, "setting size of internal buffer to %u\n",
+ adapter->assembled_size);
+ adapter->assembled_data =
+ g_realloc (adapter->assembled_data, adapter->assembled_size);
+ }
+ adapter->assembled_len = size;
+ copied = GST_BUFFER_SIZE (cur) - adapter->skip;
+ memcpy (adapter->assembled_data, GST_BUFFER_DATA (cur) + adapter->skip,
+ copied);
+ cur_list = g_slist_next (adapter->buflist);
+ while (copied < size) {
+ g_assert (cur_list);
+ cur = cur_list->data;
+ cur_list = g_slist_next (cur_list);
+ memcpy (adapter->assembled_data + copied, GST_BUFFER_DATA (cur),
+ MIN (GST_BUFFER_SIZE (cur), size - copied));
+ copied = MIN (size, copied + GST_BUFFER_SIZE (cur));
+ }
+
+ return adapter->assembled_data;
+}
+
+/**
+ * gst_adapter_flush:
+ * @adapter: a #GstAdapter
+ * @flush: number of bytes to flush
+ *
+ * Flushes the first @flush bytes of the @adapter.
+ */
+void
+gst_adapter_flush (GstAdapter * adapter, guint flush)
+{
+ GstBuffer *cur;
+
+ g_return_if_fail (GST_IS_ADAPTER (adapter));
+ g_return_if_fail (flush > 0);
+ g_return_if_fail (flush <= adapter->size);
+
+ GST_LOG_OBJECT (adapter, "flushing %u bytes\n", flush);
+ adapter->size -= flush;
+ adapter->assembled_len = 0;
+ while (flush > 0) {
+ cur = adapter->buflist->data;
+ if (GST_BUFFER_SIZE (cur) <= flush + adapter->skip) {
+ /* can skip whole buffer */
+ flush -= GST_BUFFER_SIZE (cur) - adapter->skip;
+ adapter->skip = 0;
+ adapter->buflist = g_slist_remove (adapter->buflist, cur);
+ gst_data_unref (GST_DATA (cur));
+ } else {
+ adapter->skip += flush;
+ break;
+ }
+ }
+}
+
+/**
+ * gst_adapter_available:
+ * @adapter: a #GstAdapter
+ *
+ * Gets the maximum amount of bytes available, that is it returns the maximum
+ * value that can be supplied to gst_adapter_peek() without that function
+ * returning NULL.
+ *
+ * Returns: amount of bytes available in @adapter
+ */
+guint
+gst_adapter_available (GstAdapter * adapter)
+{
+ g_return_val_if_fail (GST_IS_ADAPTER (adapter), 0);
+
+ return adapter->size;
+}
+
+/**
+ * gst_adapter_available_fast:
+ * @adapter: a #GstAdapter
+ *
+ * Gets the maximum amount of bytes available without the need to do expensive
+ * operations (like copying the data into a temporary buffer).
+ *
+ * Returns: amount of bytes available in @adapter without expensive operations
+ */
+guint
+gst_adapter_available_fast (GstAdapter * adapter)
+{
+ g_return_val_if_fail (GST_IS_ADAPTER (adapter), 0);
+
+ if (!adapter->buflist)
+ return 0;
+ if (adapter->assembled_len)
+ return adapter->assembled_len;
+ g_assert (GST_BUFFER_SIZE (adapter->buflist->data) > adapter->skip);
+ return GST_BUFFER_SIZE (adapter->buflist->data) - adapter->skip;
+}
--- /dev/null
+/* GStreamer
+ * Copyright (C) 2001 Erik Walthinsen <omega@temple-baptist.com>
+ *
+ * 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 <gst/gst.h>
+
+#ifndef __GST_ADAPTER_H__
+#define __GST_ADAPTER_H__
+
+G_BEGIN_DECLS
+
+
+#define GST_TYPE_ADAPTER \
+ (gst_adapter_get_type())
+#define GST_ADAPTER(obj) \
+ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ADAPTER,GstAdapter))
+#define GST_ADAPTER_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ADAPTER,GstAdapterClass))
+#define GST_IS_ADAPTER(obj) \
+ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ADAPTER))
+#define GST_IS_ADAPTER_CLASS(obj) \
+ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ADAPTER))
+
+typedef struct _GstAdapter GstAdapter;
+typedef struct _GstAdapterClass GstAdapterClass;
+
+struct _GstAdapter {
+ GObject object;
+
+ GSList * buflist;
+ guint size;
+ guint skip;
+
+ /* we keep state of assembled pieces */
+ guint8 * assembled_data;
+ guint assembled_size;
+ guint assembled_len;
+
+ gpointer _gst_reserved[GST_PADDING];
+};
+
+struct _GstAdapterClass {
+ GObjectClass parent_class;
+
+ gpointer _gst_reserved[GST_PADDING];
+};
+
+GstAdapter * gst_adapter_new (void);
+
+void gst_adapter_clear (GstAdapter *adapter);
+void gst_adapter_push (GstAdapter *adapter, GstBuffer* buf);
+const guint8 * gst_adapter_peek (GstAdapter *adapter, guint size);
+void gst_adapter_flush (GstAdapter *adapter, guint flush);
+guint gst_adapter_available (GstAdapter *adapter);
+guint gst_adapter_available_fast (GstAdapter *adapter);
+
+
+G_END_DECLS
+
+#endif /* __GST_ADAPTER_H__ */
projects / platform / upstream / gstreamer.git / commitdiff