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linux/drivers/media/dvb/dvb-core/demux.h
Alexey Dobriyan 8a59822f68 V4L/DVB (3413): Typos grab bag of the month 
Typos grab bag of the month.
Eyeballed by jmc@ in OpenBSD.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2006-03-08 12:30:19 -03:00

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/*
* demux.h
*
* Copyright (c) 2002 Convergence GmbH
*
* based on code:
* Copyright (c) 2000 Nokia Research Center
* Tampere, FINLAND
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* 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 Lesser 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.
*
*/
#ifndef __DEMUX_H
#define __DEMUX_H
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/time.h>
#include <linux/dvb/dmx.h>
/*--------------------------------------------------------------------------*/
/* 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 18
#endif
/*
* DMX_MAX_SECFEED_SIZE: Maximum length (in bytes) of a private section feed filter.
*/
#ifndef DMX_MAX_SECTION_SIZE
#define DMX_MAX_SECTION_SIZE 4096
#endif
#ifndef DMX_MAX_SECFEED_SIZE
#define DMX_MAX_SECFEED_SIZE (DMX_MAX_SECTION_SIZE + 188)
#endif
/*
* enum dmx_success: Success codes for the Demux Callback API.
*/
enum dmx_success {
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 */
} ;
/*--------------------------------------------------------------------------*/
/* TS packet reception */
/*--------------------------------------------------------------------------*/
/* TS filter type for set() */
#define TS_PACKET 1 /* send TS packets (188 bytes) to callback (default) */
#define TS_PAYLOAD_ONLY 2 /* in case TS_PACKET is set, only send the TS
payload (<=184 bytes per packet) to callback */
#define TS_DECODER 4 /* send stream to built-in decoder (if present) */
/* PES type for filters which write to built-in decoder */
/* these should be kept identical to the types in dmx.h */
enum dmx_ts_pes
{ /* also send packets to decoder (if it exists) */
DMX_TS_PES_AUDIO0,
DMX_TS_PES_VIDEO0,
DMX_TS_PES_TELETEXT0,
DMX_TS_PES_SUBTITLE0,
DMX_TS_PES_PCR0,
DMX_TS_PES_AUDIO1,
DMX_TS_PES_VIDEO1,
DMX_TS_PES_TELETEXT1,
DMX_TS_PES_SUBTITLE1,
DMX_TS_PES_PCR1,
DMX_TS_PES_AUDIO2,
DMX_TS_PES_VIDEO2,
DMX_TS_PES_TELETEXT2,
DMX_TS_PES_SUBTITLE2,
DMX_TS_PES_PCR2,
DMX_TS_PES_AUDIO3,
DMX_TS_PES_VIDEO3,
DMX_TS_PES_TELETEXT3,
DMX_TS_PES_SUBTITLE3,
DMX_TS_PES_PCR3,
DMX_TS_PES_OTHER
};
#define DMX_TS_PES_AUDIO DMX_TS_PES_AUDIO0
#define DMX_TS_PES_VIDEO DMX_TS_PES_VIDEO0
#define DMX_TS_PES_TELETEXT DMX_TS_PES_TELETEXT0
#define DMX_TS_PES_SUBTITLE DMX_TS_PES_SUBTITLE0
#define DMX_TS_PES_PCR DMX_TS_PES_PCR0
struct dmx_ts_feed {
int is_filtering; /* Set to non-zero when filtering in progress */
struct dmx_demux *parent; /* Back-pointer */
void *priv; /* Pointer to private data of the API client */
int (*set) (struct dmx_ts_feed *feed,
u16 pid,
int type,
enum dmx_ts_pes pes_type,
size_t circular_buffer_size,
struct timespec timeout);
int (*start_filtering) (struct dmx_ts_feed* feed);
int (*stop_filtering) (struct dmx_ts_feed* feed);
};
/*--------------------------------------------------------------------------*/
/* Section reception */
/*--------------------------------------------------------------------------*/
struct dmx_section_filter {
u8 filter_value [DMX_MAX_FILTER_SIZE];
u8 filter_mask [DMX_MAX_FILTER_SIZE];
u8 filter_mode [DMX_MAX_FILTER_SIZE];
struct dmx_section_feed* parent; /* Back-pointer */
void* priv; /* Pointer to private data of the API client */
};
struct dmx_section_feed {
int is_filtering; /* Set to non-zero when filtering in progress */
struct dmx_demux* parent; /* Back-pointer */
void* priv; /* Pointer to private data of the API client */
int check_crc;
u32 crc_val;
u8 *secbuf;
u8 secbuf_base[DMX_MAX_SECFEED_SIZE];
u16 secbufp, seclen, tsfeedp;
int (*set) (struct dmx_section_feed* feed,
u16 pid,
size_t circular_buffer_size,
int check_crc);
int (*allocate_filter) (struct dmx_section_feed* feed,
struct dmx_section_filter** filter);
int (*release_filter) (struct dmx_section_feed* feed,
struct dmx_section_filter* filter);
int (*start_filtering) (struct dmx_section_feed* feed);
int (*stop_filtering) (struct dmx_section_feed* feed);
};
/*--------------------------------------------------------------------------*/
/* Callback functions */
/*--------------------------------------------------------------------------*/
typedef int (*dmx_ts_cb) ( const u8 * buffer1,
size_t buffer1_length,
const u8 * buffer2,
size_t buffer2_length,
struct dmx_ts_feed* source,
enum dmx_success success);
typedef int (*dmx_section_cb) ( const u8 * buffer1,
size_t buffer1_len,
const u8 * buffer2,
size_t buffer2_len,
struct dmx_section_filter * source,
enum dmx_success success);
/*--------------------------------------------------------------------------*/
/* DVB Front-End */
/*--------------------------------------------------------------------------*/
enum dmx_frontend_source {
DMX_MEMORY_FE,
DMX_FRONTEND_0,
DMX_FRONTEND_1,
DMX_FRONTEND_2,
DMX_FRONTEND_3,
DMX_STREAM_0, /* external stream input, e.g. LVDS */
DMX_STREAM_1,
DMX_STREAM_2,
DMX_STREAM_3
};
struct dmx_frontend {
struct list_head connectivity_list; /* List of front-ends that can
be connected to a particular
demux */
enum dmx_frontend_source source;
};
/*--------------------------------------------------------------------------*/
/* MPEG-2 TS Demux */
/*--------------------------------------------------------------------------*/
/*
* Flags OR'ed in the capabilities field of struct dmx_demux.
*/
#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
/*
* 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 * struct dmx_frontend
*.
*/
#define DMX_FE_ENTRY(list) list_entry(list, struct dmx_frontend, connectivity_list)
struct dmx_demux {
u32 capabilities; /* Bitfield of capability flags */
struct dmx_frontend* frontend; /* Front-end connected to the demux */
void* priv; /* Pointer to private data of the API client */
int (*open) (struct dmx_demux* demux);
int (*close) (struct dmx_demux* demux);
int (*write) (struct dmx_demux* demux, const char* buf, size_t count);
int (*allocate_ts_feed) (struct dmx_demux* demux,
struct dmx_ts_feed** feed,
dmx_ts_cb callback);
int (*release_ts_feed) (struct dmx_demux* demux,
struct dmx_ts_feed* feed);
int (*allocate_section_feed) (struct dmx_demux* demux,
struct dmx_section_feed** feed,
dmx_section_cb callback);
int (*release_section_feed) (struct dmx_demux* demux,
struct dmx_section_feed* feed);
int (*add_frontend) (struct dmx_demux* demux,
struct dmx_frontend* frontend);
int (*remove_frontend) (struct dmx_demux* demux,
struct dmx_frontend* frontend);
struct list_head* (*get_frontends) (struct dmx_demux* demux);
int (*connect_frontend) (struct dmx_demux* demux,
struct dmx_frontend* frontend);
int (*disconnect_frontend) (struct dmx_demux* demux);
int (*get_pes_pids) (struct dmx_demux* demux, u16 *pids);
int (*get_caps) (struct dmx_demux* demux, struct dmx_caps *caps);
int (*set_source) (struct dmx_demux* demux, const dmx_source_t *src);
int (*get_stc) (struct dmx_demux* demux, unsigned int num,
u64 *stc, unsigned int *base);
};
#endif /* #ifndef __DEMUX_H */
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