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/* * demux.h * * Copyright (c) 2000 Nokia Research Center
* Tampere, FINLAND
*
* Project:
* Universal Broadcast Access
*
* Contains:
* Type definitions of a Linux kernel-level API for filtering MPEG-2 TS
* packets and MPEG-2 sections. Support for PES packet filtering will be
* added later.
*
* History:
* 12.01.2000/JPL File created - Initial version.
* 18.02.2000/JPL Minor corrections.
* 21.02.2000/JPL DMX_NAME_SIZE and dmx_in_use() removed, typos fixed,
* some names changed.
* 23.02.2000/JPL Added a parameter indicating the callback source in
* the callback functions.
* 10.03.2000/JPL Added the macros DMX_DIR_ENTRY() and DMX_FE_ENTRY().
* 15.03.2000/JPL Added the capabilities field to dmx_demux_t.
* 22.03.2000/JPL Corrected the callback parameter in the
* allocate_x_feed() functions.
* 03.04.2000/JPL Added support for optional resource conflict resolution
* and scarce resource handling.
* 05.04.2000/JPL Changed the dmx_resolve_conflict() to use resource
* type as a parameter.
* 12.04.2000/JPL Added a second buffer parameter for dmx_x_callback()
* functions to better handle buffer wrapping.
* 26.04.2000/JPL Added functions for section-level descrambling.
* 03.09.2000/JPL Removed support for conflict resolution and scarce
* resource handling. Otherwise only minor changes to
* data structures and function prototypes.
*
*
* Author:
* Juha-Pekka Luoma (JPL)
* Nokia Research Center
*
* Notes:
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
/* $Id$ */
#ifndef __DEMUX_H
#define __DEMUX_H
#ifndef __KERNEL__
#define __KERNEL__
#endif
#include <linux/types.h> /* __u8, __u16, ... */
#include <linux/list.h> /* list_entry(), struct list_head */
#include <linux/time.h> /* struct timespec */
#include <linux/errno.h> /* Function return values */
/*--------------------------------------------------------------------------*/
/* Common definitions */
/*--------------------------------------------------------------------------*/
/*
* DMX_MAX_FILTER_SIZE: Maximum length (in bytes) of a section/PES filter.
*/
#ifndef DMX_MAX_FILTER_SIZE
#define DMX_MAX_FILTER_SIZE 16
#endif
/*
* dmx_success_t: Success codes for the Demux Callback API.
*/
typedef enum {
DMX_OK = 0, /* Received Ok */
DMX_LENGTH_ERROR, /* Incorrect length */
DMX_OVERRUN_ERROR, /* Receiver ring buffer overrun */
DMX_CRC_ERROR, /* Incorrect CRC */
DMX_FRAME_ERROR, /* Frame alignment error */
DMX_FIFO_ERROR, /* Receiver FIFO overrun */
DMX_MISSED_ERROR /* Receiver missed packet */
} dmx_success_t;
/*--------------------------------------------------------------------------*/
/* TS packet reception */
/*--------------------------------------------------------------------------*/
struct dmx_ts_feed_s {
int is_filtering; /* Set to non-zero when filtering in progress */
struct dmx_demux_s* parent; /* Back-pointer */
void* priv; /* Pointer to private data of the API client */
int (*set) (struct dmx_ts_feed_s* feed,
__u16 pid,
size_t callback_length,
size_t circular_buffer_size,
int descramble,
struct timespec timeout);
int (*start_filtering) (struct dmx_ts_feed_s* feed);
int (*stop_filtering) (struct dmx_ts_feed_s* feed);
};
typedef struct dmx_ts_feed_s dmx_ts_feed_t;
/*--------------------------------------------------------------------------*/
/* PES packet reception (not supported yet) */
/*--------------------------------------------------------------------------*/
typedef void dmx_pes_feed_t;
typedef void dmx_pes_filter_t;
/*--------------------------------------------------------------------------*/
/* Section reception */
/*--------------------------------------------------------------------------*/
typedef struct {
__u8 filter_value [DMX_MAX_FILTER_SIZE];
__u8 filter_mask [DMX_MAX_FILTER_SIZE];
struct dmx_section_feed_s* parent; /* Back-pointer */
void* priv; /* Pointer to private data of the API client */
} dmx_section_filter_t;
struct dmx_section_feed_s {
int is_filtering; /* Set to non-zero when filtering in progress */
struct dmx_demux_s* parent; /* Back-pointer */
void* priv; /* Pointer to private data of the API client */
int (*set) (struct dmx_section_feed_s* feed,
__u16 pid,
size_t circular_buffer_size,
int descramble,
int check_crc);
int (*allocate_filter) (struct dmx_section_feed_s* feed,
dmx_section_filter_t** filter);
int (*release_filter) (struct dmx_section_feed_s* feed,
dmx_section_filter_t* filter);
int (*start_filtering) (struct dmx_section_feed_s* feed);
int (*stop_filtering) (struct dmx_section_feed_s* feed);
};
typedef struct dmx_section_feed_s dmx_section_feed_t;
/*--------------------------------------------------------------------------*/
/* Callback functions */
/*--------------------------------------------------------------------------*/
typedef int (*dmx_ts_cb) ( __u8 * buffer1,
size_t buffer1_length,
__u8 * buffer2,
size_t buffer2_length,
dmx_ts_feed_t* source,
dmx_success_t success);
typedef int (*dmx_section_cb) ( __u8 * buffer1,
size_t buffer_len,
__u8 * buffer2,
size_t buffer2_len,
dmx_section_filter_t * source,
dmx_success_t success);
typedef int (*dmx_pes_cb) ( __u8 * buffer1,
size_t buffer1_len,
__u8 * buffer2,
size_t buffer2_len,
dmx_pes_filter_t* source,
dmx_success_t success);
/*--------------------------------------------------------------------------*/
/* DVB Front-End */
/*--------------------------------------------------------------------------*/
typedef enum {
DMX_OTHER_FE = 0,
DMX_SATELLITE_FE,
DMX_CABLE_FE,
DMX_TERRESTRIAL_FE,
DMX_LVDS_FE,
DMX_ASI_FE /* DVB-ASI interface */
} dmx_frontend_source_t;
typedef struct {
/* The following char* fields point to NULL terminated strings */
char* id; /* Unique front-end identifier */
char* vendor; /* Name of the front-end vendor */
char* model; /* Name of the front-end model */
struct list_head connectivity_list; /* List of front-ends that can
be connected to a particular
demux */
void* priv; /* Pointer to private data of the API client */
} dmx_frontend_t;
/*--------------------------------------------------------------------------*/
/* MPEG-2 TS Demux */
/*--------------------------------------------------------------------------*/
/*
* Flags OR'ed in the capabilites field of struct dmx_demux_s.
*/
#define DMX_TS_FILTERING 1
#define DMX_PES_FILTERING 2
#define DMX_SECTION_FILTERING 4
#define DMX_MEMORY_BASED_FILTERING 8 /* write() available */
#define DMX_CRC_CHECKING 16
#define DMX_TS_DESCRAMBLING 32
#define DMX_SECTION_PAYLOAD_DESCRAMBLING 64
#define DMX_MAC_ADDRESS_DESCRAMBLING 128
/*
* Demux resource type identifier.
*/
/*
* DMX_FE_ENTRY(): Casts elements in the list of registered
* front-ends from the generic type struct list_head
* to the type * dmx_frontend_t
*.
*/
#define DMX_FE_ENTRY(list) list_entry(list, dmx_frontend_t, connectivity_list)
struct dmx_demux_s {
/* The following char* fields point to NULL terminated strings */
char* id; /* Unique demux identifier */
char* vendor; /* Name of the demux vendor */
char* model; /* Name of the demux model */
__u32 capabilites; /* Bitfield of capability flags */
dmx_frontend_t* frontend; /* Front-end connected to the demux */
struct list_head reg_list; /* List of registered demuxes */
void* priv; /* Pointer to private data of the API client */
int (*open) (struct dmx_demux_s* demux);
int (*close) (struct dmx_demux_s* demux);
int (*write) (struct dmx_demux_s* demux, const char* buf, size_t count);
int (*allocate_ts_feed) (struct dmx_demux_s* demux,
dmx_ts_feed_t** feed,
dmx_ts_cb callback);
int (*release_ts_feed) (struct dmx_demux_s* demux,
dmx_ts_feed_t* feed);
int (*allocate_pes_feed) (struct dmx_demux_s* demux,
dmx_pes_feed_t** feed,
dmx_pes_cb callback);
int (*release_pes_feed) (struct dmx_demux_s* demux,
dmx_pes_feed_t* feed);
int (*allocate_section_feed) (struct dmx_demux_s* demux,
dmx_section_feed_t** feed,
dmx_section_cb callback);
int (*release_section_feed) (struct dmx_demux_s* demux,
dmx_section_feed_t* feed);
int (*descramble_mac_address) (struct dmx_demux_s* demux,
__u8* buffer1,
size_t buffer1_length,
__u8* buffer2,
size_t buffer2_length,
__u16 pid);
int (*descramble_section_payload) (struct dmx_demux_s* demux,
__u8* buffer1,
size_t buffer1_length,
__u8* buffer2, size_t buffer2_length,
__u16 pid);
int (*add_frontend) (struct dmx_demux_s* demux,
dmx_frontend_t* frontend);
int (*remove_frontend) (struct dmx_demux_s* demux,
dmx_frontend_t* frontend);
struct list_head* (*get_frontends) (struct dmx_demux_s* demux);
int (*connect_frontend) (struct dmx_demux_s* demux,
dmx_frontend_t* frontend);
int (*disconnect_frontend) (struct dmx_demux_s* demux);
};
typedef struct dmx_demux_s dmx_demux_t;
/*--------------------------------------------------------------------------*/
/* Demux directory */
/*--------------------------------------------------------------------------*/
/*
* DMX_DIR_ENTRY(): Casts elements in the list of registered
* demuxes from the generic type struct list_head* to the type dmx_demux_t
*.
*/
#define DMX_DIR_ENTRY(list) list_entry(list, dmx_demux_t, reg_list)
int dmx_register_demux (dmx_demux_t* demux);
int dmx_unregister_demux (dmx_demux_t* demux);
struct list_head* dmx_get_demuxes (void);
#endif /* #ifndef __DEMUX_H */
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