--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/ext/gio/gstgiobasesrc.c	Wed Sep 01 12:16:41 2010 +0100
@@ -0,0 +1,383 @@
+/* GStreamer
+ *
+ * Copyright (C) 2007 Rene Stadler <mail@renestadler.de>
+ * Copyright (C) 2007 Sebastian Dröge <slomo@circular-chaos.org>
+ * 
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "gstgiobasesrc.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_gio_base_src_debug);
+#define GST_CAT_DEFAULT gst_gio_base_src_debug
+
+static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS_ANY);
+
+GST_BOILERPLATE (GstGioBaseSrc, gst_gio_base_src, GstBaseSrc,
+    GST_TYPE_BASE_SRC);
+
+static void gst_gio_base_src_finalize (GObject * object);
+static gboolean gst_gio_base_src_start (GstBaseSrc * base_src);
+static gboolean gst_gio_base_src_stop (GstBaseSrc * base_src);
+static gboolean gst_gio_base_src_get_size (GstBaseSrc * base_src,
+    guint64 * size);
+static gboolean gst_gio_base_src_is_seekable (GstBaseSrc * base_src);
+static gboolean gst_gio_base_src_unlock (GstBaseSrc * base_src);
+static gboolean gst_gio_base_src_unlock_stop (GstBaseSrc * base_src);
+static gboolean gst_gio_base_src_check_get_range (GstBaseSrc * base_src);
+static GstFlowReturn gst_gio_base_src_create (GstBaseSrc * base_src,
+    guint64 offset, guint size, GstBuffer ** buf);
+
+static void
+gst_gio_base_src_base_init (gpointer gclass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
+
+  GST_DEBUG_CATEGORY_INIT (gst_gio_base_src_debug, "gio_base_src", 0,
+      "GIO base source");
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&src_factory));
+}
+
+static void
+gst_gio_base_src_class_init (GstGioBaseSrcClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
+  GstBaseSrcClass *gstbasesrc_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
+  gstbasesrc_class = (GstBaseSrcClass *) klass;
+
+  gobject_class->finalize = gst_gio_base_src_finalize;
+
+  gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_gio_base_src_start);
+  gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_gio_base_src_stop);
+  gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_gio_base_src_get_size);
+  gstbasesrc_class->is_seekable =
+      GST_DEBUG_FUNCPTR (gst_gio_base_src_is_seekable);
+  gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_gio_base_src_unlock);
+  gstbasesrc_class->unlock_stop =
+      GST_DEBUG_FUNCPTR (gst_gio_base_src_unlock_stop);
+  gstbasesrc_class->check_get_range =
+      GST_DEBUG_FUNCPTR (gst_gio_base_src_check_get_range);
+  gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_gio_base_src_create);
+}
+
+static void
+gst_gio_base_src_init (GstGioBaseSrc * src, GstGioBaseSrcClass * gclass)
+{
+  src->cancel = g_cancellable_new ();
+}
+
+static void
+gst_gio_base_src_finalize (GObject * object)
+{
+  GstGioBaseSrc *src = GST_GIO_BASE_SRC (object);
+
+  if (src->cancel) {
+    g_object_unref (src->cancel);
+    src->cancel = NULL;
+  }
+
+  if (src->stream) {
+    g_object_unref (src->stream);
+    src->stream = NULL;
+  }
+
+  GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
+}
+
+static gboolean
+gst_gio_base_src_start (GstBaseSrc * base_src)
+{
+  GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
+
+  if (!G_IS_INPUT_STREAM (src->stream)) {
+    GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL),
+        ("No stream given yet"));
+    return FALSE;
+  }
+
+  src->position = 0;
+
+  GST_DEBUG_OBJECT (src, "started stream");
+
+  return TRUE;
+}
+
+static gboolean
+gst_gio_base_src_stop (GstBaseSrc * base_src)
+{
+  GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
+  gboolean success;
+  GError *err = NULL;
+
+  if (G_IS_INPUT_STREAM (src->stream)) {
+    GST_DEBUG_OBJECT (src, "closing stream");
+
+    /* FIXME: can block but unfortunately we can't use async operations
+     * here because they require a running main loop */
+    success = g_input_stream_close (src->stream, src->cancel, &err);
+
+    if (!success && !gst_gio_error (src, "g_input_stream_close", &err, NULL)) {
+      GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),
+          ("g_input_stream_close failed: %s", err->message));
+      g_clear_error (&err);
+    } else if (!success) {
+      GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),
+          ("g_input_stream_close failed"));
+    } else {
+      GST_DEBUG_OBJECT (src, "g_input_stream_close succeeded");
+    }
+
+    g_object_unref (src->stream);
+    src->stream = NULL;
+  }
+
+  return TRUE;
+}
+
+static gboolean
+gst_gio_base_src_get_size (GstBaseSrc * base_src, guint64 * size)
+{
+  GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
+
+  if (G_IS_FILE_INPUT_STREAM (src->stream)) {
+    GFileInfo *info;
+    GError *err = NULL;
+
+    info = g_file_input_stream_query_info (G_FILE_INPUT_STREAM (src->stream),
+        G_FILE_ATTRIBUTE_STANDARD_SIZE, src->cancel, &err);
+
+    if (info != NULL) {
+      *size = g_file_info_get_size (info);
+      g_object_unref (info);
+      GST_DEBUG_OBJECT (src, "found size: %" G_GUINT64_FORMAT, *size);
+      return TRUE;
+    }
+
+    if (!gst_gio_error (src, "g_file_input_stream_query_info", &err, NULL)) {
+
+      if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))
+        GST_DEBUG_OBJECT (src, "size information not available");
+      else
+        GST_WARNING_OBJECT (src, "size information retrieval failed: %s",
+            err->message);
+
+      g_clear_error (&err);
+    }
+  } else if (GST_GIO_STREAM_IS_SEEKABLE (src->stream)) {
+    goffset old;
+    goffset stream_size;
+    gboolean ret;
+    GSeekable *seekable = G_SEEKABLE (src->stream);
+    GError *err = NULL;
+
+    old = g_seekable_tell (seekable);
+
+    ret = g_seekable_seek (seekable, 0, G_SEEK_END, src->cancel, &err);
+    if (!ret) {
+      if (!gst_gio_error (src, "g_seekable_seek", &err, NULL)) {
+        if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))
+          GST_DEBUG_OBJECT (src,
+              "Seeking to the end of stream is not supported");
+        else
+          GST_WARNING_OBJECT (src, "Seeking to end of stream failed: %s",
+              err->message);
+        g_clear_error (&err);
+      } else {
+        GST_WARNING_OBJECT (src, "Seeking to end of stream failed");
+      }
+
+      return FALSE;
+    }
+
+    stream_size = g_seekable_tell (seekable);
+
+    ret = g_seekable_seek (seekable, old, G_SEEK_SET, src->cancel, &err);
+    if (!ret) {
+      if (!gst_gio_error (src, "g_seekable_seek", &err, NULL)) {
+        if (GST_GIO_ERROR_MATCHES (err, NOT_SUPPORTED))
+          GST_ERROR_OBJECT (src, "Seeking to the old position not supported");
+        else
+          GST_ERROR_OBJECT (src, "Seeking to the old position failed: %s",
+              err->message);
+        g_clear_error (&err);
+      } else {
+        GST_ERROR_OBJECT (src, "Seeking to the old position faile");
+      }
+
+      return FALSE;
+    }
+
+    if (stream_size >= 0) {
+      *size = stream_size;
+      return TRUE;
+    }
+  }
+
+  return FALSE;
+}
+
+static gboolean
+gst_gio_base_src_is_seekable (GstBaseSrc * base_src)
+{
+  GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
+  gboolean seekable;
+
+  seekable = GST_GIO_STREAM_IS_SEEKABLE (src->stream);
+
+  GST_DEBUG_OBJECT (src, "can seek: %d", seekable);
+
+  return seekable;
+}
+
+static gboolean
+gst_gio_base_src_unlock (GstBaseSrc * base_src)
+{
+  GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
+
+  GST_LOG_OBJECT (src, "triggering cancellation");
+
+  g_cancellable_cancel (src->cancel);
+
+  return TRUE;
+}
+
+static gboolean
+gst_gio_base_src_unlock_stop (GstBaseSrc * base_src)
+{
+  GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
+
+  GST_LOG_OBJECT (src, "resetting cancellable");
+
+  g_cancellable_reset (src->cancel);
+
+  return TRUE;
+}
+
+static gboolean
+gst_gio_base_src_check_get_range (GstBaseSrc * base_src)
+{
+  /* FIXME: Implement dry-run variant using guesswork like gnomevfssrc? */
+
+  return GST_CALL_PARENT_WITH_DEFAULT (GST_BASE_SRC_CLASS,
+      check_get_range, (base_src), FALSE);
+}
+
+static GstFlowReturn
+gst_gio_base_src_create (GstBaseSrc * base_src, guint64 offset, guint size,
+    GstBuffer ** buf_return)
+{
+  GstGioBaseSrc *src = GST_GIO_BASE_SRC (base_src);
+  GstBuffer *buf;
+  gssize read;
+  gboolean success, eos;
+  GstFlowReturn ret = GST_FLOW_OK;
+  GError *err = NULL;
+
+  g_return_val_if_fail (G_IS_INPUT_STREAM (src->stream), GST_FLOW_ERROR);
+
+  if (G_UNLIKELY (offset != src->position)) {
+    if (!GST_GIO_STREAM_IS_SEEKABLE (src->stream))
+      return GST_FLOW_NOT_SUPPORTED;
+
+    ret = gst_gio_seek (src, G_SEEKABLE (src->stream), offset, src->cancel);
+
+    if (ret == GST_FLOW_OK)
+      src->position = offset;
+    else
+      return ret;
+  }
+
+  buf = gst_buffer_new_and_alloc (size);
+
+  GST_LOG_OBJECT (src, "reading %u bytes from offset %" G_GUINT64_FORMAT,
+      size, offset);
+
+  read =
+      g_input_stream_read (G_INPUT_STREAM (src->stream), GST_BUFFER_DATA (buf),
+      size, src->cancel, &err);
+
+  success = (read >= 0);
+  eos = (size > 0 && read == 0);
+
+  if (!success && !gst_gio_error (src, "g_input_stream_read", &err, &ret)) {
+    GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),
+        ("Could not read from stream: %s", err->message));
+    g_clear_error (&err);
+  }
+
+  if (success && !eos) {
+    src->position += read;
+    GST_BUFFER_OFFSET (buf) = offset;
+    GST_BUFFER_SIZE (buf) = read;
+    *buf_return = buf;
+  } else {
+    /* !success || eos */
+    gst_buffer_unref (buf);
+  }
+
+  if (eos)
+    ret = GST_FLOW_UNEXPECTED;
+
+  return ret;
+}
+
+void
+gst_gio_base_src_set_stream (GstGioBaseSrc * src, GInputStream * stream)
+{
+  gboolean success;
+  GError *err = NULL;
+
+  g_return_if_fail (G_IS_INPUT_STREAM (stream));
+  g_return_if_fail ((GST_STATE (src) != GST_STATE_PLAYING &&
+          GST_STATE (src) != GST_STATE_PAUSED));
+
+  if (G_IS_INPUT_STREAM (src->stream)) {
+    GST_DEBUG_OBJECT (src, "closing old stream");
+
+    /* FIXME: can block but unfortunately we can't use async operations
+     * here because they require a running main loop */
+    success = g_input_stream_close (src->stream, src->cancel, &err);
+
+    if (!success && !gst_gio_error (src, "g_input_stream_close", &err, NULL)) {
+      GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),
+          ("g_input_stream_close failed: %s", err->message));
+      g_clear_error (&err);
+    } else if (!success) {
+      GST_ELEMENT_WARNING (src, RESOURCE, CLOSE, (NULL),
+          ("g_input_stream_close failed"));
+    } else {
+      GST_DEBUG_OBJECT (src, "g_input_stream_close succeeded");
+    }
+
+    g_object_unref (src->stream);
+    src->stream = NULL;
+  }
+
+  src->stream = stream;
+}