/* 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;

}