355 lines
11 KiB
C
355 lines
11 KiB
C
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/*
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* dvb_demux.h: DVB kernel demux API
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*
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* Copyright (C) 2000-2001 Marcus Metzler & Ralph Metzler
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* for convergence integrated media GmbH
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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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*/
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#ifndef _DVB_DEMUX_H_
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#define _DVB_DEMUX_H_
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#include <linux/time.h>
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#include <linux/timer.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <media/demux.h>
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/**
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* enum dvb_dmx_filter_type - type of demux feed.
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*
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* @DMX_TYPE_TS: feed is in TS mode.
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* @DMX_TYPE_SEC: feed is in Section mode.
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*/
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enum dvb_dmx_filter_type {
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DMX_TYPE_TS,
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DMX_TYPE_SEC,
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};
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/**
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* enum dvb_dmx_state - state machine for a demux filter.
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*
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* @DMX_STATE_FREE: indicates that the filter is freed.
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* @DMX_STATE_ALLOCATED: indicates that the filter was allocated
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* to be used.
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* @DMX_STATE_READY: indicates that the filter is ready
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* to be used.
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* @DMX_STATE_GO: indicates that the filter is running.
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*/
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enum dvb_dmx_state {
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DMX_STATE_FREE,
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DMX_STATE_ALLOCATED,
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DMX_STATE_READY,
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DMX_STATE_GO,
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};
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#define DVB_DEMUX_MASK_MAX 18
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#define MAX_PID 0x1fff
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#define SPEED_PKTS_INTERVAL 50000
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/**
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* struct dvb_demux_filter - Describes a DVB demux section filter.
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*
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* @filter: Section filter as defined by &struct dmx_section_filter.
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* @maskandmode: logical ``and`` bit mask.
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* @maskandnotmode: logical ``and not`` bit mask.
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* @doneq: flag that indicates when a filter is ready.
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* @next: pointer to the next section filter.
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* @feed: &struct dvb_demux_feed pointer.
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* @index: index of the used demux filter.
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* @state: state of the filter as described by &enum dvb_dmx_state.
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* @type: type of the filter as described
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* by &enum dvb_dmx_filter_type.
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*/
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struct dvb_demux_filter {
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struct dmx_section_filter filter;
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u8 maskandmode[DMX_MAX_FILTER_SIZE];
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u8 maskandnotmode[DMX_MAX_FILTER_SIZE];
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bool doneq;
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struct dvb_demux_filter *next;
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struct dvb_demux_feed *feed;
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int index;
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enum dvb_dmx_state state;
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enum dvb_dmx_filter_type type;
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/* private: used only by av7110 */
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u16 hw_handle;
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};
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/**
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* struct dvb_demux_feed - describes a DVB field
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*
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* @feed: a union describing a digital TV feed.
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* Depending on the feed type, it can be either
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* @feed.ts or @feed.sec.
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* @feed.ts: a &struct dmx_ts_feed pointer.
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* For TS feed only.
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* @feed.sec: a &struct dmx_section_feed pointer.
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* For section feed only.
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* @cb: a union describing digital TV callbacks.
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* Depending on the feed type, it can be either
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* @cb.ts or @cb.sec.
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* @cb.ts: a dmx_ts_cb() calback function pointer.
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* For TS feed only.
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* @cb.sec: a dmx_section_cb() callback function pointer.
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* For section feed only.
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* @demux: pointer to &struct dvb_demux.
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* @priv: private data that can optionally be used by a DVB driver.
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* @type: type of the filter, as defined by &enum dvb_dmx_filter_type.
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* @state: state of the filter as defined by &enum dvb_dmx_state.
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* @pid: PID to be filtered.
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* @timeout: feed timeout.
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* @filter: pointer to &struct dvb_demux_filter.
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* @buffer_flags: Buffer flags used to report discontinuity users via DVB
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* memory mapped API, as defined by &enum dmx_buffer_flags.
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* @ts_type: type of TS, as defined by &enum ts_filter_type.
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* @pes_type: type of PES, as defined by &enum dmx_ts_pes.
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* @cc: MPEG-TS packet continuity counter
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* @pusi_seen: if true, indicates that a discontinuity was detected.
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* it is used to prevent feeding of garbage from previous section.
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* @peslen: length of the PES (Packet Elementary Stream).
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* @list_head: head for the list of digital TV demux feeds.
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* @index: a unique index for each feed. Can be used as hardware
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* pid filter index.
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*/
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struct dvb_demux_feed {
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union {
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struct dmx_ts_feed ts;
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struct dmx_section_feed sec;
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} feed;
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union {
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dmx_ts_cb ts;
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dmx_section_cb sec;
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} cb;
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struct dvb_demux *demux;
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void *priv;
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enum dvb_dmx_filter_type type;
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enum dvb_dmx_state state;
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u16 pid;
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ktime_t timeout;
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struct dvb_demux_filter *filter;
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u32 buffer_flags;
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enum ts_filter_type ts_type;
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enum dmx_ts_pes pes_type;
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int cc;
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bool pusi_seen;
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u16 peslen;
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struct list_head list_head;
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unsigned int index;
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};
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/**
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* struct dvb_demux - represents a digital TV demux
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* @dmx: embedded &struct dmx_demux with demux capabilities
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* and callbacks.
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* @priv: private data that can optionally be used by
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* a DVB driver.
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* @filternum: maximum amount of DVB filters.
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* @feednum: maximum amount of DVB feeds.
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* @start_feed: callback routine to be called in order to start
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* a DVB feed.
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* @stop_feed: callback routine to be called in order to stop
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* a DVB feed.
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* @write_to_decoder: callback routine to be called if the feed is TS and
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* it is routed to an A/V decoder, when a new TS packet
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* is received.
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* Used only on av7110-av.c.
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* @check_crc32: callback routine to check CRC. If not initialized,
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* dvb_demux will use an internal one.
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* @memcopy: callback routine to memcopy received data.
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* If not initialized, dvb_demux will default to memcpy().
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* @users: counter for the number of demux opened file descriptors.
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* Currently, it is limited to 10 users.
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* @filter: pointer to &struct dvb_demux_filter.
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* @feed: pointer to &struct dvb_demux_feed.
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* @frontend_list: &struct list_head with frontends used by the demux.
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* @pesfilter: array of &struct dvb_demux_feed with the PES types
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* that will be filtered.
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* @pids: list of filtered program IDs.
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* @feed_list: &struct list_head with feeds.
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* @tsbuf: temporary buffer used internally to store TS packets.
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* @tsbufp: temporary buffer index used internally.
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* @mutex: pointer to &struct mutex used to protect feed set
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* logic.
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* @lock: pointer to &spinlock_t, used to protect buffer handling.
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* @cnt_storage: buffer used for TS/TEI continuity check.
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* @speed_last_time: &ktime_t used for TS speed check.
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* @speed_pkts_cnt: packets count used for TS speed check.
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*/
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struct dvb_demux {
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struct dmx_demux dmx;
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void *priv;
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int filternum;
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int feednum;
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int (*start_feed)(struct dvb_demux_feed *feed);
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int (*stop_feed)(struct dvb_demux_feed *feed);
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int (*write_to_decoder)(struct dvb_demux_feed *feed,
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const u8 *buf, size_t len);
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u32 (*check_crc32)(struct dvb_demux_feed *feed,
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const u8 *buf, size_t len);
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void (*memcopy)(struct dvb_demux_feed *feed, u8 *dst,
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const u8 *src, size_t len);
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int users;
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#define MAX_DVB_DEMUX_USERS 10
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struct dvb_demux_filter *filter;
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struct dvb_demux_feed *feed;
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struct list_head frontend_list;
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struct dvb_demux_feed *pesfilter[DMX_PES_OTHER];
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u16 pids[DMX_PES_OTHER];
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#define DMX_MAX_PID 0x2000
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struct list_head feed_list;
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u8 tsbuf[204];
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int tsbufp;
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struct mutex mutex;
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spinlock_t lock;
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uint8_t *cnt_storage; /* for TS continuity check */
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ktime_t speed_last_time; /* for TS speed check */
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uint32_t speed_pkts_cnt; /* for TS speed check */
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/* private: used only on av7110 */
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int playing;
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int recording;
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};
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/**
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* dvb_dmx_init - initialize a digital TV demux struct.
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*
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* @demux: &struct dvb_demux to be initialized.
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*
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* Before being able to register a digital TV demux struct, drivers
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* should call this routine. On its typical usage, some fields should
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* be initialized at the driver before calling it.
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*
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* A typical usecase is::
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*
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* dvb->demux.dmx.capabilities =
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* DMX_TS_FILTERING | DMX_SECTION_FILTERING |
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* DMX_MEMORY_BASED_FILTERING;
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* dvb->demux.priv = dvb;
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* dvb->demux.filternum = 256;
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* dvb->demux.feednum = 256;
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* dvb->demux.start_feed = driver_start_feed;
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* dvb->demux.stop_feed = driver_stop_feed;
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* ret = dvb_dmx_init(&dvb->demux);
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* if (ret < 0)
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* return ret;
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*/
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int dvb_dmx_init(struct dvb_demux *demux);
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/**
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* dvb_dmx_release - releases a digital TV demux internal buffers.
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*
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* @demux: &struct dvb_demux to be released.
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*
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* The DVB core internally allocates data at @demux. This routine
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* releases those data. Please notice that the struct itelf is not
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* released, as it can be embedded on other structs.
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*/
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void dvb_dmx_release(struct dvb_demux *demux);
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/**
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* dvb_dmx_swfilter_packets - use dvb software filter for a buffer with
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* multiple MPEG-TS packets with 188 bytes each.
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*
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* @demux: pointer to &struct dvb_demux
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* @buf: buffer with data to be filtered
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* @count: number of MPEG-TS packets with size of 188.
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*
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* The routine will discard a DVB packet that don't start with 0x47.
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*
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* Use this routine if the DVB demux fills MPEG-TS buffers that are
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* already aligned.
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*
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* NOTE: The @buf size should have size equal to ``count * 188``.
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*/
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void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,
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size_t count);
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/**
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* dvb_dmx_swfilter - use dvb software filter for a buffer with
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* multiple MPEG-TS packets with 188 bytes each.
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*
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* @demux: pointer to &struct dvb_demux
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* @buf: buffer with data to be filtered
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* @count: number of MPEG-TS packets with size of 188.
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*
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* If a DVB packet doesn't start with 0x47, it will seek for the first
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* byte that starts with 0x47.
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*
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* Use this routine if the DVB demux fill buffers that may not start with
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* a packet start mark (0x47).
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*
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* NOTE: The @buf size should have size equal to ``count * 188``.
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*/
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void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count);
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/**
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* dvb_dmx_swfilter_204 - use dvb software filter for a buffer with
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* multiple MPEG-TS packets with 204 bytes each.
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*
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* @demux: pointer to &struct dvb_demux
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* @buf: buffer with data to be filtered
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* @count: number of MPEG-TS packets with size of 204.
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*
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* If a DVB packet doesn't start with 0x47, it will seek for the first
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* byte that starts with 0x47.
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*
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* Use this routine if the DVB demux fill buffers that may not start with
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* a packet start mark (0x47).
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*
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* NOTE: The @buf size should have size equal to ``count * 204``.
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*/
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void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf,
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size_t count);
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/**
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* dvb_dmx_swfilter_raw - make the raw data available to userspace without
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* filtering
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*
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* @demux: pointer to &struct dvb_demux
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* @buf: buffer with data
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* @count: number of packets to be passed. The actual size of each packet
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* depends on the &dvb_demux->feed->cb.ts logic.
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*
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* Use it if the driver needs to deliver the raw payload to userspace without
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* passing through the kernel demux. That is meant to support some
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* delivery systems that aren't based on MPEG-TS.
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*
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* This function relies on &dvb_demux->feed->cb.ts to actually handle the
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* buffer.
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*/
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void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf,
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size_t count);
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#endif /* _DVB_DEMUX_H_ */
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