mirror of https://gitee.com/openkylin/linux.git
429 lines
16 KiB
C
429 lines
16 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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/**
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* struct dmx_demux - Structure that contains the demux capabilities and
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* callbacks.
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*
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* @capabilities: Bitfield of capability flags
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*
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* @frontend: Front-end connected to the demux
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*
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* @priv: Pointer to private data of the API client
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*
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* @open: This function reserves the demux for use by the caller and, if
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* necessary, initializes the demux. When the demux is no longer needed,
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* the function close() should be called. It should be possible for
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* multiple clients to access the demux at the same time. Thus, the
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* function implementation should increment the demux usage count when
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* open() is called and decrement it when close() is called.
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* It returns
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* 0 on success;
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* -EUSERS, if maximum usage count was reached;
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* -EINVAL, on bad parameter.
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*
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* @close: This function reserves the demux for use by the caller and, if
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* necessary, initializes the demux. When the demux is no longer needed,
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* the function close() should be called. It should be possible for
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* multiple clients to access the demux at the same time. Thus, the
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* function implementation should increment the demux usage count when
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* open() is called and decrement it when close() is called.
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* It returns
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* 0 on success;
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* -ENODEV, if demux was not in use
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* -EINVAL, on bad parameter.
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*
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* @write: This function provides the demux driver with a memory buffer
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* containing TS packets. Instead of receiving TS packets from the DVB
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* front-end, the demux driver software will read packets from memory.
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* Any clients of this demux with active TS, PES or Section filters will
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* receive filtered data via the Demux callback API (see 0). The function
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* returns when all the data in the buffer has been consumed by the demux.
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* Demux hardware typically cannot read TS from memory. If this is the
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* case, memory-based filtering has to be implemented entirely in software.
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* The @buf function parameter contains a pointer to the TS data in
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* kernel-space memory.
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* The @count function parameter contains the length of the TS data.
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* It returns
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* 0 on success;
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* -ENOSYS, if the command is not implemented;
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* -EINVAL, on bad parameter.
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*
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* @allocate_ts_feed: Allocates a new TS feed, which is used to filter the TS
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* packets carrying a certain PID. The TS feed normally corresponds to a
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* hardware PID filter on the demux chip.
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* The @feed function parameter contains a pointer to the TS feed API and
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* instance data.
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* The @callback function parameter contains a pointer to the callback
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* function for passing received TS packet.
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* It returns
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* 0 on success;
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* -EBUSY, if no more TS feeds is available;
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* -ENOSYS, if the command is not implemented;
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* -EINVAL, on bad parameter.
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*
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* @release_ts_feed: Releases the resources allocated with allocate_ts_feed().
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* Any filtering in progress on the TS feed should be stopped before
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* calling this function.
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* The @feed function parameter contains a pointer to the TS feed API and
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* instance data.
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* It returns
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* 0 on success;
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* -EINVAL on bad parameter.
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*
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* @allocate_section_feed: Allocates a new section feed, i.e. a demux resource
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* for filtering and receiving sections. On platforms with hardware
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* support for section filtering, a section feed is directly mapped to
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* the demux HW. On other platforms, TS packets are first PID filtered in
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* hardware and a hardware section filter then emulated in software. The
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* caller obtains an API pointer of type dmx_section_feed_t as an out
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* parameter. Using this API the caller can set filtering parameters and
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* start receiving sections.
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* The @feed function parameter contains a pointer to the TS feed API and
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* instance data.
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* The @callback function parameter contains a pointer to the callback
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* function for passing received TS packet.
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* It returns
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* 0 on success;
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* -EBUSY, if no more TS feeds is available;
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* -ENOSYS, if the command is not implemented;
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* -EINVAL, on bad parameter.
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*
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* @release_section_feed: Releases the resources allocated with
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* allocate_section_feed(), including allocated filters. Any filtering in
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* progress on the section feed should be stopped before calling this
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* function.
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* The @feed function parameter contains a pointer to the TS feed API and
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* instance data.
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* It returns
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* 0 on success;
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* -EINVAL, on bad parameter.
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*
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* @add_frontend: Registers a connectivity between a demux and a front-end,
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* i.e., indicates that the demux can be connected via a call to
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* connect_frontend() to use the given front-end as a TS source. The
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* client of this function has to allocate dynamic or static memory for
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* the frontend structure and initialize its fields before calling this
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* function. This function is normally called during the driver
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* initialization. The caller must not free the memory of the frontend
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* struct before successfully calling remove_frontend().
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* The @frontend function parameter contains a pointer to the front-end
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* instance data.
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* It returns
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* 0 on success;
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* -EEXIST, if a front-end with the same value of the id field
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* already registered;
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* -EINUSE, if the demux is in use;
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* -ENOMEM, if no more front-ends can be added;
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* -EINVAL, on bad parameter.
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*
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* @remove_frontend: Indicates that the given front-end, registered by a call
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* to add_frontend(), can no longer be connected as a TS source by this
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* demux. The function should be called when a front-end driver or a demux
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* driver is removed from the system. If the front-end is in use, the
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* function fails with the return value of -EBUSY. After successfully
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* calling this function, the caller can free the memory of the frontend
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* struct if it was dynamically allocated before the add_frontend()
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* operation.
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* The @frontend function parameter contains a pointer to the front-end
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* instance data.
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* It returns
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* 0 on success;
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* -EBUSY, if the front-end is in use, i.e. a call to
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* connect_frontend() has not been followed by a call to
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* disconnect_frontend();
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* -EINVAL, on bad parameter.
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*
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* @get_frontends: Provides the APIs of the front-ends that have been
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* registered for this demux. Any of the front-ends obtained with this
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* call can be used as a parameter for connect_frontend(). The include
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* file demux.h contains the macro DMX_FE_ENTRY() for converting an
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* element of the generic type struct list_head* to the type
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* dmx_frontend_t*. The caller must not free the memory of any of the
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* elements obtained via this function call.
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* It returns a struct list_head pointer to the list of front-end
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* interfaces, or NULL in the case of an empty list.
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*
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* @connect_frontend: Connects the TS output of the front-end to the input of
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* the demux. A demux can only be connected to a front-end registered to
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* the demux with the function add_frontend(). It may or may not be
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* possible to connect multiple demuxes to the same front-end, depending
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* on the capabilities of the HW platform. When not used, the front-end
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* should be released by calling disconnect_frontend().
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* The @frontend function parameter contains a pointer to the front-end
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* instance data.
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* It returns
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* 0 on success;
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* -EBUSY, if the front-end is in use;
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* -EINVAL, on bad parameter.
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*
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* @disconnect_frontend: Disconnects the demux and a front-end previously
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* connected by a connect_frontend() call.
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* The @demux function parameter contains a pointer to the demux API and
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* instance data.
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* It returns
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* 0 on success;
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* -EINVAL on bad parameter.
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*/
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struct dmx_demux {
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u32 capabilities;
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struct dmx_frontend* frontend;
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void* priv;
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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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