242 строки
7.7 KiB
C
242 строки
7.7 KiB
C
/*
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* demux.h
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*
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* Copyright (c) 2002 Convergence GmbH
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*
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* based on code:
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* Copyright (c) 2000 Nokia Research Center
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* Tampere, FINLAND
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#ifndef __DEMUX_H
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#define __DEMUX_H
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include <linux/time.h>
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#include <linux/dvb/dmx.h>
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/*--------------------------------------------------------------------------*/
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/* Common definitions */
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/*--------------------------------------------------------------------------*/
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/*
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* DMX_MAX_FILTER_SIZE: Maximum length (in bytes) of a section/PES filter.
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*/
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#ifndef DMX_MAX_FILTER_SIZE
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#define DMX_MAX_FILTER_SIZE 18
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#endif
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/*
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* DMX_MAX_SECFEED_SIZE: Maximum length (in bytes) of a private section feed filter.
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*/
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#ifndef DMX_MAX_SECTION_SIZE
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#define DMX_MAX_SECTION_SIZE 4096
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#endif
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#ifndef DMX_MAX_SECFEED_SIZE
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#define DMX_MAX_SECFEED_SIZE (DMX_MAX_SECTION_SIZE + 188)
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#endif
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/*
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* enum dmx_success: Success codes for the Demux Callback API.
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*/
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enum dmx_success {
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DMX_OK = 0, /* Received Ok */
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DMX_LENGTH_ERROR, /* Incorrect length */
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DMX_OVERRUN_ERROR, /* Receiver ring buffer overrun */
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DMX_CRC_ERROR, /* Incorrect CRC */
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DMX_FRAME_ERROR, /* Frame alignment error */
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DMX_FIFO_ERROR, /* Receiver FIFO overrun */
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DMX_MISSED_ERROR /* Receiver missed packet */
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} ;
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/*--------------------------------------------------------------------------*/
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/* TS packet reception */
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/*--------------------------------------------------------------------------*/
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/* TS filter type for set() */
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#define TS_PACKET 1 /* send TS packets (188 bytes) to callback (default) */
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#define TS_PAYLOAD_ONLY 2 /* in case TS_PACKET is set, only send the TS
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payload (<=184 bytes per packet) to callback */
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#define TS_DECODER 4 /* send stream to built-in decoder (if present) */
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#define TS_DEMUX 8 /* in case TS_PACKET is set, send the TS to
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the demux device, not to the dvr device */
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struct dmx_ts_feed {
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int is_filtering; /* Set to non-zero when filtering in progress */
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struct dmx_demux *parent; /* Back-pointer */
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void *priv; /* Pointer to private data of the API client */
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int (*set) (struct dmx_ts_feed *feed,
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u16 pid,
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int type,
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enum dmx_ts_pes pes_type,
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size_t circular_buffer_size,
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struct timespec timeout);
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int (*start_filtering) (struct dmx_ts_feed* feed);
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int (*stop_filtering) (struct dmx_ts_feed* feed);
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};
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/*--------------------------------------------------------------------------*/
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/* Section reception */
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/*--------------------------------------------------------------------------*/
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struct dmx_section_filter {
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u8 filter_value [DMX_MAX_FILTER_SIZE];
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u8 filter_mask [DMX_MAX_FILTER_SIZE];
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u8 filter_mode [DMX_MAX_FILTER_SIZE];
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struct dmx_section_feed* parent; /* Back-pointer */
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void* priv; /* Pointer to private data of the API client */
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};
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struct dmx_section_feed {
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int is_filtering; /* Set to non-zero when filtering in progress */
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struct dmx_demux* parent; /* Back-pointer */
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void* priv; /* Pointer to private data of the API client */
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int check_crc;
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u32 crc_val;
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u8 *secbuf;
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u8 secbuf_base[DMX_MAX_SECFEED_SIZE];
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u16 secbufp, seclen, tsfeedp;
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int (*set) (struct dmx_section_feed* feed,
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u16 pid,
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size_t circular_buffer_size,
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int check_crc);
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int (*allocate_filter) (struct dmx_section_feed* feed,
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struct dmx_section_filter** filter);
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int (*release_filter) (struct dmx_section_feed* feed,
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struct dmx_section_filter* filter);
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int (*start_filtering) (struct dmx_section_feed* feed);
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int (*stop_filtering) (struct dmx_section_feed* feed);
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};
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/*--------------------------------------------------------------------------*/
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/* Callback functions */
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/*--------------------------------------------------------------------------*/
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typedef int (*dmx_ts_cb) ( const u8 * buffer1,
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size_t buffer1_length,
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const u8 * buffer2,
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size_t buffer2_length,
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struct dmx_ts_feed* source,
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enum dmx_success success);
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typedef int (*dmx_section_cb) ( const u8 * buffer1,
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size_t buffer1_len,
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const u8 * buffer2,
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size_t buffer2_len,
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struct dmx_section_filter * source,
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enum dmx_success success);
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/*--------------------------------------------------------------------------*/
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/* DVB Front-End */
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/*--------------------------------------------------------------------------*/
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enum dmx_frontend_source {
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DMX_MEMORY_FE,
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DMX_FRONTEND_0,
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DMX_FRONTEND_1,
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DMX_FRONTEND_2,
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DMX_FRONTEND_3,
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DMX_STREAM_0, /* external stream input, e.g. LVDS */
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DMX_STREAM_1,
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DMX_STREAM_2,
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DMX_STREAM_3
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};
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struct dmx_frontend {
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struct list_head connectivity_list; /* List of front-ends that can
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be connected to a particular
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demux */
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enum dmx_frontend_source source;
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};
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/*--------------------------------------------------------------------------*/
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/* MPEG-2 TS Demux */
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/*--------------------------------------------------------------------------*/
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/*
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* Flags OR'ed in the capabilities field of struct dmx_demux.
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*/
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#define DMX_TS_FILTERING 1
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#define DMX_PES_FILTERING 2
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#define DMX_SECTION_FILTERING 4
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#define DMX_MEMORY_BASED_FILTERING 8 /* write() available */
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#define DMX_CRC_CHECKING 16
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#define DMX_TS_DESCRAMBLING 32
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/*
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* Demux resource type identifier.
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*/
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/*
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* DMX_FE_ENTRY(): Casts elements in the list of registered
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* front-ends from the generic type struct list_head
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* to the type * struct dmx_frontend
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*.
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*/
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#define DMX_FE_ENTRY(list) list_entry(list, struct dmx_frontend, connectivity_list)
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struct dmx_demux {
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u32 capabilities; /* Bitfield of capability flags */
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struct dmx_frontend* frontend; /* Front-end connected to the demux */
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void* priv; /* Pointer to private data of the API client */
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int (*open) (struct dmx_demux* demux);
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int (*close) (struct dmx_demux* demux);
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int (*write) (struct dmx_demux* demux, const char __user *buf, size_t count);
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int (*allocate_ts_feed) (struct dmx_demux* demux,
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struct dmx_ts_feed** feed,
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dmx_ts_cb callback);
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int (*release_ts_feed) (struct dmx_demux* demux,
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struct dmx_ts_feed* feed);
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int (*allocate_section_feed) (struct dmx_demux* demux,
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struct dmx_section_feed** feed,
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dmx_section_cb callback);
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int (*release_section_feed) (struct dmx_demux* demux,
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struct dmx_section_feed* feed);
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int (*add_frontend) (struct dmx_demux* demux,
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struct dmx_frontend* frontend);
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int (*remove_frontend) (struct dmx_demux* demux,
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struct dmx_frontend* frontend);
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struct list_head* (*get_frontends) (struct dmx_demux* demux);
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int (*connect_frontend) (struct dmx_demux* demux,
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struct dmx_frontend* frontend);
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int (*disconnect_frontend) (struct dmx_demux* demux);
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int (*get_pes_pids) (struct dmx_demux* demux, u16 *pids);
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int (*get_caps) (struct dmx_demux* demux, struct dmx_caps *caps);
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int (*set_source) (struct dmx_demux* demux, const dmx_source_t *src);
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int (*get_stc) (struct dmx_demux* demux, unsigned int num,
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u64 *stc, unsigned int *base);
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};
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#endif /* #ifndef __DEMUX_H */
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