599 lines
23 KiB
C
599 lines
23 KiB
C
/*
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* demux.h
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*
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* The Kernel Digital TV Demux kABI defines a driver-internal interface for
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* registering low-level, hardware specific driver to a hardware independent
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* demux layer.
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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
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* 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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* TS packet reception
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*/
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/**
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* enum ts_filter_type - filter type bitmap for dmx_ts_feed.set\(\)
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*
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* @TS_PACKET: Send TS packets (188 bytes) to callback (default).
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* @TS_PAYLOAD_ONLY: In case TS_PACKET is set, only send the TS payload
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* (<=184 bytes per packet) to callback
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* @TS_DECODER: Send stream to built-in decoder (if present).
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* @TS_DEMUX: In case TS_PACKET is set, send the TS to the demux
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* device, not to the dvr device
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*/
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enum ts_filter_type {
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TS_PACKET = 1,
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TS_PAYLOAD_ONLY = 2,
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TS_DECODER = 4,
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TS_DEMUX = 8,
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};
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/**
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* struct dmx_ts_feed - Structure that contains a TS feed filter
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*
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* @is_filtering: Set to non-zero when filtering in progress
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* @parent: pointer to struct dmx_demux
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* @priv: pointer to private data of the API client
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* @set: sets the TS filter
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* @start_filtering: starts TS filtering
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* @stop_filtering: stops TS filtering
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*
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* A TS feed is typically mapped to a hardware PID filter on the demux chip.
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* Using this API, the client can set the filtering properties to start/stop
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* filtering TS packets on a particular TS feed.
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*/
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struct dmx_ts_feed {
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int is_filtering;
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struct dmx_demux *parent;
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void *priv;
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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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ktime_t 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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/**
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* struct dmx_section_filter - Structure that describes a section filter
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*
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* @filter_value: Contains up to 16 bytes (128 bits) of the TS section header
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* that will be matched by the section filter
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* @filter_mask: Contains a 16 bytes (128 bits) filter mask with the bits
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* specified by @filter_value that will be used on the filter
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* match logic.
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* @filter_mode: Contains a 16 bytes (128 bits) filter mode.
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* @parent: Pointer to struct dmx_section_feed.
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* @priv: Pointer to private data of the API client.
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*
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*
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* The @filter_mask controls which bits of @filter_value are compared with
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* the section headers/payload. On a binary value of 1 in filter_mask, the
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* corresponding bits are compared. The filter only accepts sections that are
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* equal to filter_value in all the tested bit positions.
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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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/**
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* struct dmx_section_feed - Structure that contains a section feed filter
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*
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* @is_filtering: Set to non-zero when filtering in progress
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* @parent: pointer to struct dmx_demux
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* @priv: pointer to private data of the API client
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* @check_crc: If non-zero, check the CRC values of filtered sections.
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* @set: sets the section filter
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* @allocate_filter: This function is used to allocate a section filter on
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* the demux. It should only be called when no filtering
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* is in progress on this section feed. If a filter cannot
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* be allocated, the function fails with -ENOSPC.
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* @release_filter: This function releases all the resources of a
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* previously allocated section filter. The function
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* should not be called while filtering is in progress
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* on this section feed. After calling this function,
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* the caller should not try to dereference the filter
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* pointer.
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* @start_filtering: starts section filtering
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* @stop_filtering: stops section filtering
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*
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* A TS feed is typically mapped to a hardware PID filter on the demux chip.
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* Using this API, the client can set the filtering properties to start/stop
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* filtering TS packets on a particular TS feed.
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*/
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struct dmx_section_feed {
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int is_filtering;
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struct dmx_demux *parent;
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void *priv;
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int check_crc;
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/* private: Used internally at dvb_demux.c */
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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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/* public: */
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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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* typedef dmx_ts_cb - DVB demux TS filter callback function prototype
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*
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* @buffer1: Pointer to the start of the filtered TS packets.
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* @buffer1_length: Length of the TS data in buffer1.
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* @buffer2: Pointer to the tail of the filtered TS packets, or NULL.
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* @buffer2_length: Length of the TS data in buffer2.
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* @source: Indicates which TS feed is the source of the callback.
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*
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* This function callback prototype, provided by the client of the demux API,
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* is called from the demux code. The function is only called when filtering
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* on ae TS feed has been enabled using the start_filtering() function at
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* the &dmx_demux.
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* Any TS packets that match the filter settings are copied to a circular
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* buffer. The filtered TS packets are delivered to the client using this
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* callback function. The size of the circular buffer is controlled by the
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* circular_buffer_size parameter of the &dmx_ts_feed.@set function.
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* It is expected that the @buffer1 and @buffer2 callback parameters point to
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* addresses within the circular buffer, but other implementations are also
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* possible. Note that the called party should not try to free the memory
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* the @buffer1 and @buffer2 parameters point to.
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*
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* When this function is called, the @buffer1 parameter typically points to
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* the start of the first undelivered TS packet within a circular buffer.
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* The @buffer2 buffer parameter is normally NULL, except when the received
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* TS packets have crossed the last address of the circular buffer and
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* ”wrapped” to the beginning of the buffer. In the latter case the @buffer1
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* parameter would contain an address within the circular buffer, while the
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* @buffer2 parameter would contain the first address of the circular buffer.
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* The number of bytes delivered with this function (i.e. @buffer1_length +
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* @buffer2_length) is usually equal to the value of callback_length parameter
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* given in the set() function, with one exception: if a timeout occurs before
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* receiving callback_length bytes of TS data, any undelivered packets are
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* immediately delivered to the client by calling this function. The timeout
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* duration is controlled by the set() function in the TS Feed API.
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*
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* If a TS packet is received with errors that could not be fixed by the
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* TS-level forward error correction (FEC), the Transport_error_indicator
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* flag of the TS packet header should be set. The TS packet should not be
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* discarded, as the error can possibly be corrected by a higher layer
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* protocol. If the called party is slow in processing the callback, it
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* is possible that the circular buffer eventually fills up. If this happens,
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* the demux driver should discard any TS packets received while the buffer
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* is full and return -EOVERFLOW.
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*
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* The type of data returned to the callback can be selected by the
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* &dmx_ts_feed.@set function. The type parameter decides if the raw
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* TS packet (TS_PACKET) or just the payload (TS_PACKET|TS_PAYLOAD_ONLY)
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* should be returned. If additionally the TS_DECODER bit is set the stream
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* will also be sent to the hardware MPEG decoder.
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*
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* Return:
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* 0, on success;
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* -EOVERFLOW, on buffer overflow.
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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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/**
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* typedef dmx_section_cb - DVB demux TS filter callback function prototype
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*
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* @buffer1: Pointer to the start of the filtered section, e.g.
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* within the circular buffer of the demux driver.
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* @buffer1_len: Length of the filtered section data in @buffer1,
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* including headers and CRC.
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* @buffer2: Pointer to the tail of the filtered section data,
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* or NULL. Useful to handle the wrapping of a
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* circular buffer.
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* @buffer2_len: Length of the filtered section data in @buffer2,
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* including headers and CRC.
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* @source: Indicates which section feed is the source of the
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* callback.
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*
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* This function callback prototype, provided by the client of the demux API,
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* is called from the demux code. The function is only called when
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* filtering of sections has been enabled using the function
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* &dmx_ts_feed.@start_filtering. When the demux driver has received a
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* complete section that matches at least one section filter, the client
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* is notified via this callback function. Normally this function is called
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* for each received section; however, it is also possible to deliver
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* multiple sections with one callback, for example when the system load
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* is high. If an error occurs while receiving a section, this
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* function should be called with the corresponding error type set in the
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* success field, whether or not there is data to deliver. The Section Feed
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* implementation should maintain a circular buffer for received sections.
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* However, this is not necessary if the Section Feed API is implemented as
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* a client of the TS Feed API, because the TS Feed implementation then
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* buffers the received data. The size of the circular buffer can be
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* configured using the &dmx_ts_feed.@set function in the Section Feed API.
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* If there is no room in the circular buffer when a new section is received,
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* the section must be discarded. If this happens, the value of the success
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* parameter should be DMX_OVERRUN_ERROR on the next callback.
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*/
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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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/*--------------------------------------------------------------------------*/
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/* DVB Front-End */
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/*--------------------------------------------------------------------------*/
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/**
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* enum dmx_frontend_source - Used to identify the type of frontend
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*
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* @DMX_MEMORY_FE: The source of the demux is memory. It means that
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* the MPEG-TS to be filtered comes from userspace,
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* via write() syscall.
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*
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* @DMX_FRONTEND_0: The source of the demux is a frontend connected
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* to the demux.
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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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};
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/**
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* struct dmx_frontend - Structure that lists the frontends associated with
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* a demux
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*
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* @connectivity_list: List of front-ends that can be connected to a
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* particular demux;
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* @source: Type of the frontend.
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*
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* FIXME: this structure should likely be replaced soon by some
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* media-controller based logic.
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*/
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struct dmx_frontend {
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struct list_head connectivity_list;
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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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* enum dmx_demux_caps - MPEG-2 TS Demux capabilities bitmap
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*
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* @DMX_TS_FILTERING: set if TS filtering is supported;
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* @DMX_SECTION_FILTERING: set if section filtering is supported;
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* @DMX_MEMORY_BASED_FILTERING: set if write() available.
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*
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* Those flags are OR'ed in the &dmx_demux.capabilities field
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*/
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enum dmx_demux_caps {
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DMX_TS_FILTERING = 1,
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DMX_SECTION_FILTERING = 4,
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DMX_MEMORY_BASED_FILTERING = 8,
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};
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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) \
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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 (e. g. no users);
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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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* -ERESTARTSYS, if mutex lock was interrupted;
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* -EINTR, if a signal handling is pending;
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* -ENODEV, if demux was removed;
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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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* -ERESTARTSYS, if mutex lock was interrupted;
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* -EBUSY, if no more TS feeds is available;
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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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* -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
|
|
* instance data.
|
|
* It returns:
|
|
* 0 on success;
|
|
* -EINVAL, on bad parameter.
|
|
*
|
|
* @add_frontend: Registers a connectivity between a demux and a front-end,
|
|
* i.e., indicates that the demux can be connected via a call to
|
|
* @connect_frontend to use the given front-end as a TS source. The
|
|
* client of this function has to allocate dynamic or static memory for
|
|
* the frontend structure and initialize its fields before calling this
|
|
* function. This function is normally called during the driver
|
|
* initialization. The caller must not free the memory of the frontend
|
|
* struct before successfully calling @remove_frontend.
|
|
* The @demux function parameter contains a pointer to the demux API and
|
|
* instance data.
|
|
* The @frontend function parameter contains a pointer to the front-end
|
|
* instance data.
|
|
* It returns:
|
|
* 0 on success;
|
|
* -EINVAL, on bad parameter.
|
|
*
|
|
* @remove_frontend: Indicates that the given front-end, registered by a call
|
|
* to @add_frontend, can no longer be connected as a TS source by this
|
|
* demux. The function should be called when a front-end driver or a demux
|
|
* driver is removed from the system. If the front-end is in use, the
|
|
* function fails with the return value of -EBUSY. After successfully
|
|
* calling this function, the caller can free the memory of the frontend
|
|
* struct if it was dynamically allocated before the @add_frontend
|
|
* operation.
|
|
* The @demux function parameter contains a pointer to the demux API and
|
|
* instance data.
|
|
* The @frontend function parameter contains a pointer to the front-end
|
|
* instance data.
|
|
* It returns:
|
|
* 0 on success;
|
|
* -ENODEV, if the front-end was not found,
|
|
* -EINVAL, on bad parameter.
|
|
*
|
|
* @get_frontends: Provides the APIs of the front-ends that have been
|
|
* registered for this demux. Any of the front-ends obtained with this
|
|
* call can be used as a parameter for @connect_frontend. The include
|
|
* file demux.h contains the macro DMX_FE_ENTRY() for converting an
|
|
* element of the generic type struct &list_head * to the type
|
|
* struct &dmx_frontend *. The caller must not free the memory of any of
|
|
* the elements obtained via this function call.
|
|
* The @demux function parameter contains a pointer to the demux API and
|
|
* instance data.
|
|
* It returns a struct list_head pointer to the list of front-end
|
|
* interfaces, or NULL in the case of an empty list.
|
|
*
|
|
* @connect_frontend: Connects the TS output of the front-end to the input of
|
|
* the demux. A demux can only be connected to a front-end registered to
|
|
* the demux with the function @add_frontend. It may or may not be
|
|
* possible to connect multiple demuxes to the same front-end, depending
|
|
* on the capabilities of the HW platform. When not used, the front-end
|
|
* should be released by calling @disconnect_frontend.
|
|
* The @demux function parameter contains a pointer to the demux API and
|
|
* instance data.
|
|
* The @frontend function parameter contains a pointer to the front-end
|
|
* instance data.
|
|
* It returns:
|
|
* 0 on success;
|
|
* -EINVAL, on bad parameter.
|
|
*
|
|
* @disconnect_frontend: Disconnects the demux and a front-end previously
|
|
* connected by a @connect_frontend call.
|
|
* The @demux function parameter contains a pointer to the demux API and
|
|
* instance data.
|
|
* It returns:
|
|
* 0 on success;
|
|
* -EINVAL on bad parameter.
|
|
*
|
|
* @get_pes_pids: Get the PIDs for DMX_PES_AUDIO0, DMX_PES_VIDEO0,
|
|
* DMX_PES_TELETEXT0, DMX_PES_SUBTITLE0 and DMX_PES_PCR0.
|
|
* The @demux function parameter contains a pointer to the demux API and
|
|
* instance data.
|
|
* The @pids function parameter contains an array with five u16 elements
|
|
* where the PIDs will be stored.
|
|
* It returns:
|
|
* 0 on success;
|
|
* -EINVAL on bad parameter.
|
|
*/
|
|
|
|
struct dmx_demux {
|
|
enum dmx_demux_caps capabilities;
|
|
struct dmx_frontend *frontend;
|
|
void *priv;
|
|
int (*open)(struct dmx_demux *demux);
|
|
int (*close)(struct dmx_demux *demux);
|
|
int (*write)(struct dmx_demux *demux, const char __user *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);
|
|
|
|
/* private: Not used upstream and never documented */
|
|
#if 0
|
|
int (*get_caps)(struct dmx_demux *demux, struct dmx_caps *caps);
|
|
int (*set_source)(struct dmx_demux *demux, const dmx_source_t *src);
|
|
#endif
|
|
/*
|
|
* private: Only used at av7110, to read some data from firmware.
|
|
* As this was never documented, we have no clue about what's
|
|
* there, and its usage on other drivers aren't encouraged.
|
|
*/
|
|
int (*get_stc)(struct dmx_demux *demux, unsigned int num,
|
|
u64 *stc, unsigned int *base);
|
|
};
|
|
|
|
#endif /* #ifndef __DEMUX_H */
|