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115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
/*
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* camtransport.h - GStreamer CAM (EN50221) transport layer
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* Copyright (C) 2007 Alessandro Decina
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*
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* Authors:
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* Alessandro Decina <alessandro.d@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef CAM_TRANSPORT_H
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#define CAM_TRANSPORT_H
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#include <gst/gst.h>
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#include "cam.h"
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#include "camutils.h"
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#define HOST_BUFFER_SIZE 1024
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#define CAM_TL(obj) ((CamTL *) obj)
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#define CAM_TL_CONNECTION(obj) ((CamTLConnection *) obj)
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typedef struct _CamTL CamTL;
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typedef struct _CamTLPrivate CamTLPrivate;
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typedef struct _CamTLConnection CamTLConnection;
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typedef struct _CamTLConnectionPrivate CamTLConnectionPrivate;
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typedef enum
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{
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CAM_TL_CONNECTION_STATE_CLOSED,
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CAM_TL_CONNECTION_STATE_IN_CREATION,
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CAM_TL_CONNECTION_STATE_OPEN,
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CAM_TL_CONNECTION_STATE_IN_DELETION
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} CamTLConnectionState;
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struct _CamTL
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{
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int fd;
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guint connection_ids;
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GHashTable *connections;
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guint expected_tpdus;
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/* buffer containing module data */
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guint8 buffer [HOST_BUFFER_SIZE];
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/* number of bytes written in the buffer */
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guint buffer_size;
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/* index pointing to the first byte of a TPDU's body */
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guint8 *body;
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/* length of the body part */
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guint body_length;
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/* callbacks */
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void (*request_connection) (CamTL *tl, CamTLConnection *connection);
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void (*connection_created) (CamTL *tl, CamTLConnection *connection);
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void (*connection_deleted) (CamTL *tl, CamTLConnection *connection);
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CamReturn (*connection_data) (CamTL *tl, CamTLConnection *connection,
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guint8 *data, guint length);
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/* used by the upper layer to extend this layer */
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gpointer user_data;
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};
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struct _CamTLConnection
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{
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CamTL *tl;
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guint8 slot;
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guint id;
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CamTLConnectionState state;
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/* TRUE if the last status byte was 0x80, FALSE otherwise */
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gboolean has_data;
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/* NCAS 1.0 sometimes reports that it has data even if it doesn't. After
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* MAX_EMPTY_DATA times that we don't get any data we assume that there's
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* actually no data.
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*/
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guint empty_data;
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/* timer restarted every time the connection is polled */
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GTimer *last_poll;
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gpointer user_data;
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};
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CamTL *cam_tl_new (int cam_device_fd);
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void cam_tl_destroy (CamTL *tl);
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CamReturn cam_tl_create_connection (CamTL *tl,
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guint8 slot, CamTLConnection **connnection);
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CamReturn cam_tl_connection_delete (CamTLConnection *connection);
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void cam_tl_calc_buffer_size (CamTL *tl,
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guint body_length, guint *buffer_size, guint *offset);
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CamReturn cam_tl_connection_write (CamTLConnection *connection,
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guint8 *data, guint buffer_size, guint body_length);
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CamReturn cam_tl_connection_poll (CamTLConnection *connection, gboolean force);
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CamReturn cam_tl_read_all (CamTL *tl, gboolean poll);
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#endif /* CAM_TRANSPORT_H */
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