/* GStreamer

 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>

 *                    2000 Wim Taymans <wtay@chello.be>

 *                    2005 Philippe Khalaf <burger@speedy.org>

 *

 * gstfdsrc.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.

 */

/**

 * SECTION:element-fdsrc

 * @see_also: #GstFdSink

 *

 * Read data from a unix file descriptor.

 */

#ifdef HAVE_CONFIG_H

#  include "config.h"

#endif

#include "gst/gst_private.h"

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/socket.h>

#include <fcntl.h>

#include <stdio.h>

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

#ifdef _MSC_VER

#include <io.h>

#endif

#include <stdlib.h>

#include <errno.h>

#include "gstfdsrc.h"

static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",

    GST_PAD_SRC,

    GST_PAD_ALWAYS,

    GST_STATIC_CAPS_ANY);

GST_DEBUG_CATEGORY_STATIC (gst_fd_src_debug);

#define GST_CAT_DEFAULT gst_fd_src_debug

enum

{

  PROP_0,

  PROP_FD,

};

static void gst_fd_src_uri_handler_init (gpointer g_iface, gpointer iface_data);

static void

_do_init (GType fd_src_type)

{

  static const GInterfaceInfo urihandler_info = {

    gst_fd_src_uri_handler_init,

    NULL,

    NULL

  };

  g_type_add_interface_static (fd_src_type, GST_TYPE_URI_HANDLER,

      &urihandler_info);

  GST_DEBUG_CATEGORY_INIT (gst_fd_src_debug, "fdsrc", 0, "fdsrc element");

}

GST_BOILERPLATE_FULL (GstFdSrc, gst_fd_src, GstPushSrc, GST_TYPE_PUSH_SRC,

    _do_init);

static void gst_fd_src_set_property (GObject * object, guint prop_id,

    const GValue * value, GParamSpec * pspec);

static void gst_fd_src_get_property (GObject * object, guint prop_id,

    GValue * value, GParamSpec * pspec);

static void gst_fd_src_dispose (GObject * obj);

static gboolean gst_fd_src_start (GstBaseSrc * bsrc);

static gboolean gst_fd_src_stop (GstBaseSrc * bsrc);

static gboolean gst_fd_src_unlock (GstBaseSrc * bsrc);

static gboolean gst_fd_src_unlock_stop (GstBaseSrc * bsrc);

static gboolean gst_fd_src_is_seekable (GstBaseSrc * bsrc);

static gboolean gst_fd_src_get_size (GstBaseSrc * src, guint64 * size);

static gboolean gst_fd_src_do_seek (GstBaseSrc * src, GstSegment * segment);

static GstFlowReturn gst_fd_src_create (GstPushSrc * psrc, GstBuffer ** outbuf);

static void

gst_fd_src_base_init (gpointer g_class)

{

  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_set_details_simple (gstelement_class,

      "Filedescriptor Source",

      "Source/File",

      "Read from a file descriptor", "Erik Walthinsen <omega@cse.ogi.edu>");

  gst_element_class_add_pad_template (gstelement_class,

      gst_static_pad_template_get (&srctemplate));

}

static void

gst_fd_src_class_init (GstFdSrcClass * klass)

{

  GObjectClass *gobject_class;

  GstBaseSrcClass *gstbasesrc_class;

  GstPushSrcClass *gstpush_src_class;

  gobject_class = G_OBJECT_CLASS (klass);

  gstbasesrc_class = GST_BASE_SRC_CLASS (klass);

  gstpush_src_class = GST_PUSH_SRC_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);

  gobject_class->set_property = gst_fd_src_set_property;

  gobject_class->get_property = gst_fd_src_get_property;

  gobject_class->dispose = gst_fd_src_dispose;

  g_object_class_install_property (gobject_class, PROP_FD,

      g_param_spec_int ("fd", "fd", "An open file descriptor to read from",

  gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_fd_src_start);

  gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_fd_src_stop);

  gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_fd_src_unlock);

  gstbasesrc_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_fd_src_unlock_stop);

  gstbasesrc_class->is_seekable = GST_DEBUG_FUNCPTR (gst_fd_src_is_seekable);

  gstbasesrc_class->get_size = GST_DEBUG_FUNCPTR (gst_fd_src_get_size);

  gstbasesrc_class->do_seek = GST_DEBUG_FUNCPTR (gst_fd_src_do_seek);

  gstpush_src_class->create = GST_DEBUG_FUNCPTR (gst_fd_src_create);

}

static void

gst_fd_src_init (GstFdSrc * fdsrc, GstFdSrcClass * klass)

{

  fdsrc->new_fd = 0;

  fdsrc->seekable_fd = FALSE;

  fdsrc->uri = g_strdup_printf ("fd://0");

  fdsrc->curoffset = 0;

}

static void

gst_fd_src_dispose (GObject * obj)

{

  GstFdSrc *src = GST_FD_SRC (obj);

  g_free (src->uri);

  src->uri = NULL;

  G_OBJECT_CLASS (parent_class)->dispose (obj);

}

static void

gst_fd_src_update_fd (GstFdSrc * src)

{

  struct stat stat_results;

  /* we need to always update the fdset since it may not have existed when

  if (src->fdset != NULL) {

    GstPollFD fd = GST_POLL_FD_INIT;

    if (src->fd >= 0) {

      fd.fd = src->fd;

      gst_poll_remove_fd (src->fdset, &fd);

    }

    fd.fd = src->new_fd;

    gst_poll_add_fd (src->fdset, &fd);

    gst_poll_fd_ctl_read (src->fdset, &fd, TRUE);

  }

  if (src->fd != src->new_fd) {

    GST_INFO_OBJECT (src, "Updating to fd %d", src->new_fd);

    src->fd = src->new_fd;

    g_free (src->uri);

    src->uri = g_strdup_printf ("fd://%d", src->fd);

    if (fstat (src->fd, &stat_results) < 0)

      goto not_seekable;

    if (!S_ISREG (stat_results.st_mode))

      goto not_seekable;

    /* Try a seek of 0 bytes offset to check for seekability */

    if (lseek (src->fd, 0, SEEK_CUR) < 0)

      goto not_seekable;

    GST_INFO_OBJECT (src, "marking fd %d as seekable", src->fd);

    src->seekable_fd = TRUE;

  }

  return;

not_seekable:

  {

    GST_INFO_OBJECT (src, "marking fd %d as NOT seekable", src->fd);

    src->seekable_fd = FALSE;

  }

}

static gboolean

gst_fd_src_start (GstBaseSrc * bsrc)

{

  GstFdSrc *src = GST_FD_SRC (bsrc);

  src->curoffset = 0;

  if ((src->fdset = gst_poll_new (TRUE)) == NULL)

    goto socket_pair;

  gst_fd_src_update_fd (src);

  return TRUE;

  /* ERRORS */

socket_pair:

  {

    GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ_WRITE, (NULL),

        GST_ERROR_SYSTEM);

    return FALSE;

  }

}

static gboolean

gst_fd_src_stop (GstBaseSrc * bsrc)

{

  GstFdSrc *src = GST_FD_SRC (bsrc);

  if (src->fdset) {

    gst_poll_free (src->fdset);

    src->fdset = NULL;

  }

  return TRUE;

}

static gboolean

gst_fd_src_unlock (GstBaseSrc * bsrc)

{

  GstFdSrc *src = GST_FD_SRC (bsrc);

  GST_LOG_OBJECT (src, "Flushing");

  GST_OBJECT_LOCK (src);

  gst_poll_set_flushing (src->fdset, TRUE);

  GST_OBJECT_UNLOCK (src);

  return TRUE;

}

static gboolean

gst_fd_src_unlock_stop (GstBaseSrc * bsrc)

{

  GstFdSrc *src = GST_FD_SRC (bsrc);

  GST_LOG_OBJECT (src, "No longer flushing");

  GST_OBJECT_LOCK (src);

  gst_poll_set_flushing (src->fdset, FALSE);

  GST_OBJECT_UNLOCK (src);

  return TRUE;

}

static void

gst_fd_src_set_property (GObject * object, guint prop_id, const GValue * value,

    GParamSpec * pspec)

{

  GstFdSrc *src = GST_FD_SRC (object);

  switch (prop_id) {

    case PROP_FD:

      src->new_fd = g_value_get_int (value);

      /* If state is ready or below, update the current fd immediately

       * so it is reflected in get_properties and uri */

      GST_OBJECT_LOCK (object);

      if (GST_STATE (GST_ELEMENT (src)) <= GST_STATE_READY) {

        GST_DEBUG_OBJECT (src, "state ready or lower, updating to use new fd");

        gst_fd_src_update_fd (src);

      } else {

        GST_DEBUG_OBJECT (src, "state above ready, not updating to new fd yet");

      }

      GST_OBJECT_UNLOCK (object);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

static void

gst_fd_src_get_property (GObject * object, guint prop_id, GValue * value,

    GParamSpec * pspec)

{

  GstFdSrc *src = GST_FD_SRC (object);

  switch (prop_id) {

    case PROP_FD:

      g_value_set_int (value, src->fd);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

      break;

  }

}

static GstFlowReturn

gst_fd_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)

{

  GstFdSrc *src;

  GstBuffer *buf;

  gssize readbytes;

  guint blocksize;

#ifndef HAVE_WIN32

  gint retval;

#endif

  src = GST_FD_SRC (psrc);

#ifndef HAVE_WIN32

  do {

#endif

  blocksize = GST_BASE_SRC (src)->blocksize;

  /* create the buffer */

  do {

    readbytes = read (src->fd, GST_BUFFER_DATA (buf), blocksize);

    GST_LOG_OBJECT (src, "read %" G_GSSIZE_FORMAT, readbytes);

  } while (readbytes == -1 && errno == EINTR);  /* retry if interrupted */

  if (readbytes < 0)

    goto read_error;

  if (readbytes == 0)

    goto eos;

  GST_BUFFER_OFFSET (buf) = src->curoffset;

  GST_BUFFER_SIZE (buf) = readbytes;

  GST_BUFFER_TIMESTAMP (buf) = GST_CLOCK_TIME_NONE;

  src->curoffset += readbytes;

  GST_LOG_OBJECT (psrc, "Read buffer of size %" G_GSSIZE_FORMAT, readbytes);

  /* we're done, return the buffer */

  *outbuf = buf;

  return GST_FLOW_OK;

  /* ERRORS */

#ifndef HAVE_WIN32

  {

    GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),

    return GST_FLOW_ERROR;

  }

stopped:

  {

    return GST_FLOW_WRONG_STATE;

  }

#endif

eos:

  {

    GST_DEBUG_OBJECT (psrc, "Read 0 bytes. EOS.");

    gst_buffer_unref (buf);

    return GST_FLOW_UNEXPECTED;

  }

read_error:

  {

    GST_ELEMENT_ERROR (src, RESOURCE, READ, (NULL),

        ("read on file descriptor: %s.", g_strerror (errno)));

    GST_DEBUG_OBJECT (psrc, "Error reading from fd");

    gst_buffer_unref (buf);

    return GST_FLOW_ERROR;

  }

}

static gboolean