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354 lines
11 KiB
354 lines
11 KiB
/* |
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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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