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| -rw-r--r-- | include/media/dvb_demux.h | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/include/media/dvb_demux.h b/include/media/dvb_demux.h new file mode 100644 index 000000000..3b6aeca7a --- /dev/null +++ b/include/media/dvb_demux.h @@ -0,0 +1,354 @@ +/* + * dvb_demux.h: DVB kernel demux API + * + * Copyright (C) 2000-2001 Marcus Metzler & Ralph Metzler + * for convergence integrated media GmbH + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 2.1 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#ifndef _DVB_DEMUX_H_ +#define _DVB_DEMUX_H_ + +#include <linux/time.h> +#include <linux/timer.h> +#include <linux/spinlock.h> +#include <linux/mutex.h> + +#include <media/demux.h> + +/** + * enum dvb_dmx_filter_type - type of demux feed. + * + * @DMX_TYPE_TS: feed is in TS mode. + * @DMX_TYPE_SEC: feed is in Section mode. + */ +enum dvb_dmx_filter_type { + DMX_TYPE_TS, + DMX_TYPE_SEC, +}; + +/** + * enum dvb_dmx_state - state machine for a demux filter. + * + * @DMX_STATE_FREE: indicates that the filter is freed. + * @DMX_STATE_ALLOCATED: indicates that the filter was allocated + * to be used. + * @DMX_STATE_READY: indicates that the filter is ready + * to be used. + * @DMX_STATE_GO: indicates that the filter is running. + */ +enum dvb_dmx_state { + DMX_STATE_FREE, + DMX_STATE_ALLOCATED, + DMX_STATE_READY, + DMX_STATE_GO, +}; + +#define DVB_DEMUX_MASK_MAX 18 + +#define MAX_PID 0x1fff + +#define SPEED_PKTS_INTERVAL 50000 + +/** + * struct dvb_demux_filter - Describes a DVB demux section filter. + * + * @filter: Section filter as defined by &struct dmx_section_filter. + * @maskandmode: logical ``and`` bit mask. + * @maskandnotmode: logical ``and not`` bit mask. + * @doneq: flag that indicates when a filter is ready. + * @next: pointer to the next section filter. + * @feed: &struct dvb_demux_feed pointer. + * @index: index of the used demux filter. + * @state: state of the filter as described by &enum dvb_dmx_state. + * @type: type of the filter as described + * by &enum dvb_dmx_filter_type. + */ + +struct dvb_demux_filter { + struct dmx_section_filter filter; + u8 maskandmode[DMX_MAX_FILTER_SIZE]; + u8 maskandnotmode[DMX_MAX_FILTER_SIZE]; + bool doneq; + + struct dvb_demux_filter *next; + struct dvb_demux_feed *feed; + int index; + enum dvb_dmx_state state; + enum dvb_dmx_filter_type type; + + /* private: used only by av7110 */ + u16 hw_handle; +}; + +/** + * struct dvb_demux_feed - describes a DVB field + * + * @feed: a union describing a digital TV feed. + * Depending on the feed type, it can be either + * @feed.ts or @feed.sec. + * @feed.ts: a &struct dmx_ts_feed pointer. + * For TS feed only. + * @feed.sec: a &struct dmx_section_feed pointer. + * For section feed only. + * @cb: a union describing digital TV callbacks. + * Depending on the feed type, it can be either + * @cb.ts or @cb.sec. + * @cb.ts: a dmx_ts_cb() calback function pointer. + * For TS feed only. + * @cb.sec: a dmx_section_cb() callback function pointer. + * For section feed only. + * @demux: pointer to &struct dvb_demux. + * @priv: private data that can optionally be used by a DVB driver. + * @type: type of the filter, as defined by &enum dvb_dmx_filter_type. + * @state: state of the filter as defined by &enum dvb_dmx_state. + * @pid: PID to be filtered. + * @timeout: feed timeout. + * @filter: pointer to &struct dvb_demux_filter. + * @buffer_flags: Buffer flags used to report discontinuity users via DVB + * memory mapped API, as defined by &enum dmx_buffer_flags. + * @ts_type: type of TS, as defined by &enum ts_filter_type. + * @pes_type: type of PES, as defined by &enum dmx_ts_pes. + * @cc: MPEG-TS packet continuity counter + * @pusi_seen: if true, indicates that a discontinuity was detected. + * it is used to prevent feeding of garbage from previous section. + * @peslen: length of the PES (Packet Elementary Stream). + * @list_head: head for the list of digital TV demux feeds. + * @index: a unique index for each feed. Can be used as hardware + * pid filter index. + */ +struct dvb_demux_feed { + union { + struct dmx_ts_feed ts; + struct dmx_section_feed sec; + } feed; + + union { + dmx_ts_cb ts; + dmx_section_cb sec; + } cb; + + struct dvb_demux *demux; + void *priv; + enum dvb_dmx_filter_type type; + enum dvb_dmx_state state; + u16 pid; + + ktime_t timeout; + struct dvb_demux_filter *filter; + + u32 buffer_flags; + + enum ts_filter_type ts_type; + enum dmx_ts_pes pes_type; + + int cc; + bool pusi_seen; + + u16 peslen; + + struct list_head list_head; + unsigned int index; +}; + +/** + * struct dvb_demux - represents a digital TV demux + * @dmx: embedded &struct dmx_demux with demux capabilities + * and callbacks. + * @priv: private data that can optionally be used by + * a DVB driver. + * @filternum: maximum amount of DVB filters. + * @feednum: maximum amount of DVB feeds. + * @start_feed: callback routine to be called in order to start + * a DVB feed. + * @stop_feed: callback routine to be called in order to stop + * a DVB feed. + * @write_to_decoder: callback routine to be called if the feed is TS and + * it is routed to an A/V decoder, when a new TS packet + * is received. + * Used only on av7110-av.c. + * @check_crc32: callback routine to check CRC. If not initialized, + * dvb_demux will use an internal one. + * @memcopy: callback routine to memcopy received data. + * If not initialized, dvb_demux will default to memcpy(). + * @users: counter for the number of demux opened file descriptors. + * Currently, it is limited to 10 users. + * @filter: pointer to &struct dvb_demux_filter. + * @feed: pointer to &struct dvb_demux_feed. + * @frontend_list: &struct list_head with frontends used by the demux. + * @pesfilter: array of &struct dvb_demux_feed with the PES types + * that will be filtered. + * @pids: list of filtered program IDs. + * @feed_list: &struct list_head with feeds. + * @tsbuf: temporary buffer used internally to store TS packets. + * @tsbufp: temporary buffer index used internally. + * @mutex: pointer to &struct mutex used to protect feed set + * logic. + * @lock: pointer to &spinlock_t, used to protect buffer handling. + * @cnt_storage: buffer used for TS/TEI continuity check. + * @speed_last_time: &ktime_t used for TS speed check. + * @speed_pkts_cnt: packets count used for TS speed check. + */ +struct dvb_demux { + struct dmx_demux dmx; + void *priv; + int filternum; + int feednum; + int (*start_feed)(struct dvb_demux_feed *feed); + int (*stop_feed)(struct dvb_demux_feed *feed); + int (*write_to_decoder)(struct dvb_demux_feed *feed, + const u8 *buf, size_t len); + u32 (*check_crc32)(struct dvb_demux_feed *feed, + const u8 *buf, size_t len); + void (*memcopy)(struct dvb_demux_feed *feed, u8 *dst, + const u8 *src, size_t len); + + int users; +#define MAX_DVB_DEMUX_USERS 10 + struct dvb_demux_filter *filter; + struct dvb_demux_feed *feed; + + struct list_head frontend_list; + + struct dvb_demux_feed *pesfilter[DMX_PES_OTHER]; + u16 pids[DMX_PES_OTHER]; + +#define DMX_MAX_PID 0x2000 + struct list_head feed_list; + u8 tsbuf[204]; + int tsbufp; + + struct mutex mutex; + spinlock_t lock; + + uint8_t *cnt_storage; /* for TS continuity check */ + + ktime_t speed_last_time; /* for TS speed check */ + uint32_t speed_pkts_cnt; /* for TS speed check */ + + /* private: used only on av7110 */ + int playing; + int recording; +}; + +/** + * dvb_dmx_init - initialize a digital TV demux struct. + * + * @demux: &struct dvb_demux to be initialized. + * + * Before being able to register a digital TV demux struct, drivers + * should call this routine. On its typical usage, some fields should + * be initialized at the driver before calling it. + * + * A typical usecase is:: + * + * dvb->demux.dmx.capabilities = + * DMX_TS_FILTERING | DMX_SECTION_FILTERING | + * DMX_MEMORY_BASED_FILTERING; + * dvb->demux.priv = dvb; + * dvb->demux.filternum = 256; + * dvb->demux.feednum = 256; + * dvb->demux.start_feed = driver_start_feed; + * dvb->demux.stop_feed = driver_stop_feed; + * ret = dvb_dmx_init(&dvb->demux); + * if (ret < 0) + * return ret; + */ +int dvb_dmx_init(struct dvb_demux *demux); + +/** + * dvb_dmx_release - releases a digital TV demux internal buffers. + * + * @demux: &struct dvb_demux to be released. + * + * The DVB core internally allocates data at @demux. This routine + * releases those data. Please notice that the struct itelf is not + * released, as it can be embedded on other structs. + */ +void dvb_dmx_release(struct dvb_demux *demux); + +/** + * dvb_dmx_swfilter_packets - use dvb software filter for a buffer with + * multiple MPEG-TS packets with 188 bytes each. + * + * @demux: pointer to &struct dvb_demux + * @buf: buffer with data to be filtered + * @count: number of MPEG-TS packets with size of 188. + * + * The routine will discard a DVB packet that don't start with 0x47. + * + * Use this routine if the DVB demux fills MPEG-TS buffers that are + * already aligned. + * + * NOTE: The @buf size should have size equal to ``count * 188``. + */ +void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf, + size_t count); + +/** + * dvb_dmx_swfilter - use dvb software filter for a buffer with + * multiple MPEG-TS packets with 188 bytes each. + * + * @demux: pointer to &struct dvb_demux + * @buf: buffer with data to be filtered + * @count: number of MPEG-TS packets with size of 188. + * + * If a DVB packet doesn't start with 0x47, it will seek for the first + * byte that starts with 0x47. + * + * Use this routine if the DVB demux fill buffers that may not start with + * a packet start mark (0x47). + * + * NOTE: The @buf size should have size equal to ``count * 188``. + */ +void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count); + +/** + * dvb_dmx_swfilter_204 - use dvb software filter for a buffer with + * multiple MPEG-TS packets with 204 bytes each. + * + * @demux: pointer to &struct dvb_demux + * @buf: buffer with data to be filtered + * @count: number of MPEG-TS packets with size of 204. + * + * If a DVB packet doesn't start with 0x47, it will seek for the first + * byte that starts with 0x47. + * + * Use this routine if the DVB demux fill buffers that may not start with + * a packet start mark (0x47). + * + * NOTE: The @buf size should have size equal to ``count * 204``. + */ +void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, + size_t count); + +/** + * dvb_dmx_swfilter_raw - make the raw data available to userspace without + * filtering + * + * @demux: pointer to &struct dvb_demux + * @buf: buffer with data + * @count: number of packets to be passed. The actual size of each packet + * depends on the &dvb_demux->feed->cb.ts logic. + * + * Use it if the driver needs to deliver the raw payload to userspace without + * passing through the kernel demux. That is meant to support some + * delivery systems that aren't based on MPEG-TS. + * + * This function relies on &dvb_demux->feed->cb.ts to actually handle the + * buffer. + */ +void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, + size_t count); + +#endif /* _DVB_DEMUX_H_ */ |