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Diffstat (limited to 'include/media/dmxdev.h')
| -rw-r--r-- | include/media/dmxdev.h | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/include/media/dmxdev.h b/include/media/dmxdev.h new file mode 100644 index 000000000..baafa3b8a --- /dev/null +++ b/include/media/dmxdev.h @@ -0,0 +1,214 @@ +/* + * dmxdev.h + * + * Copyright (C) 2000 Ralph Metzler & Marcus 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 _DMXDEV_H_ +#define _DMXDEV_H_ + +#include <linux/types.h> +#include <linux/spinlock.h> +#include <linux/kernel.h> +#include <linux/time.h> +#include <linux/timer.h> +#include <linux/wait.h> +#include <linux/fs.h> +#include <linux/string.h> +#include <linux/mutex.h> +#include <linux/slab.h> + +#include <linux/dvb/dmx.h> + +#include <media/dvbdev.h> +#include <media/demux.h> +#include <media/dvb_ringbuffer.h> +#include <media/dvb_vb2.h> + +/** + * enum dmxdev_type - type of demux filter type. + * + * @DMXDEV_TYPE_NONE: no filter set. + * @DMXDEV_TYPE_SEC: section filter. + * @DMXDEV_TYPE_PES: Program Elementary Stream (PES) filter. + */ +enum dmxdev_type { + DMXDEV_TYPE_NONE, + DMXDEV_TYPE_SEC, + DMXDEV_TYPE_PES, +}; + +/** + * enum dmxdev_state - state machine for the dmxdev. + * + * @DMXDEV_STATE_FREE: indicates that the filter is freed. + * @DMXDEV_STATE_ALLOCATED: indicates that the filter was allocated + * to be used. + * @DMXDEV_STATE_SET: indicates that the filter parameters are set. + * @DMXDEV_STATE_GO: indicates that the filter is running. + * @DMXDEV_STATE_DONE: indicates that a packet was already filtered + * and the filter is now disabled. + * Set only if %DMX_ONESHOT. See + * &dmx_sct_filter_params. + * @DMXDEV_STATE_TIMEDOUT: Indicates a timeout condition. + */ +enum dmxdev_state { + DMXDEV_STATE_FREE, + DMXDEV_STATE_ALLOCATED, + DMXDEV_STATE_SET, + DMXDEV_STATE_GO, + DMXDEV_STATE_DONE, + DMXDEV_STATE_TIMEDOUT +}; + +/** + * struct dmxdev_feed - digital TV dmxdev feed + * + * @pid: Program ID to be filtered + * @ts: pointer to &struct dmx_ts_feed + * @next: &struct list_head pointing to the next feed. + */ + +struct dmxdev_feed { + u16 pid; + struct dmx_ts_feed *ts; + struct list_head next; +}; + +/** + * struct dmxdev_filter - digital TV dmxdev filter + * + * @filter: a union describing a dmxdev filter. + * Currently used only for section filters. + * @filter.sec: a &struct dmx_section_filter pointer. + * For section filter only. + * @feed: a union describing a dmxdev feed. + * Depending on the filter type, it can be either + * @feed.ts or @feed.sec. + * @feed.ts: a &struct list_head list. + * For TS and PES feeds. + * @feed.sec: a &struct dmx_section_feed pointer. + * For section feed only. + * @params: a union describing dmxdev filter parameters. + * Depending on the filter type, it can be either + * @params.sec or @params.pes. + * @params.sec: a &struct dmx_sct_filter_params embedded struct. + * For section filter only. + * @params.pes: a &struct dmx_pes_filter_params embedded struct. + * For PES filter only. + * @type: type of the dmxdev filter, as defined by &enum dmxdev_type. + * @state: state of the dmxdev filter, as defined by &enum dmxdev_state. + * @dev: pointer to &struct dmxdev. + * @buffer: an embedded &struct dvb_ringbuffer buffer. + * @vb2_ctx: control struct for VB2 handler + * @mutex: protects the access to &struct dmxdev_filter. + * @timer: &struct timer_list embedded timer, used to check for + * feed timeouts. + * Only for section filter. + * @todo: index for the @secheader. + * Only for section filter. + * @secheader: buffer cache to parse the section header. + * Only for section filter. + */ +struct dmxdev_filter { + union { + struct dmx_section_filter *sec; + } filter; + + union { + /* list of TS and PES feeds (struct dmxdev_feed) */ + struct list_head ts; + struct dmx_section_feed *sec; + } feed; + + union { + struct dmx_sct_filter_params sec; + struct dmx_pes_filter_params pes; + } params; + + enum dmxdev_type type; + enum dmxdev_state state; + struct dmxdev *dev; + struct dvb_ringbuffer buffer; + struct dvb_vb2_ctx vb2_ctx; + + struct mutex mutex; + + /* only for sections */ + struct timer_list timer; + int todo; + u8 secheader[3]; +}; + +/** + * struct dmxdev - Describes a digital TV demux device. + * + * @dvbdev: pointer to &struct dvb_device associated with + * the demux device node. + * @dvr_dvbdev: pointer to &struct dvb_device associated with + * the dvr device node. + * @filter: pointer to &struct dmxdev_filter. + * @demux: pointer to &struct dmx_demux. + * @filternum: number of filters. + * @capabilities: demux capabilities as defined by &enum dmx_demux_caps. + * @may_do_mmap: flag used to indicate if the device may do mmap. + * @exit: flag to indicate that the demux is being released. + * @dvr_orig_fe: pointer to &struct dmx_frontend. + * @dvr_buffer: embedded &struct dvb_ringbuffer for DVB output. + * @dvr_vb2_ctx: control struct for VB2 handler + * @mutex: protects the usage of this structure. + * @lock: protects access to &dmxdev->filter->data. + */ +struct dmxdev { + struct dvb_device *dvbdev; + struct dvb_device *dvr_dvbdev; + + struct dmxdev_filter *filter; + struct dmx_demux *demux; + + int filternum; + int capabilities; + + unsigned int may_do_mmap:1; + unsigned int exit:1; +#define DMXDEV_CAP_DUPLEX 1 + struct dmx_frontend *dvr_orig_fe; + + struct dvb_ringbuffer dvr_buffer; +#define DVR_BUFFER_SIZE (10*188*1024) + + struct dvb_vb2_ctx dvr_vb2_ctx; + + struct mutex mutex; + spinlock_t lock; +}; + +/** + * dvb_dmxdev_init - initializes a digital TV demux and registers both demux + * and DVR devices. + * + * @dmxdev: pointer to &struct dmxdev. + * @adap: pointer to &struct dvb_adapter. + */ +int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *adap); + +/** + * dvb_dmxdev_release - releases a digital TV demux and unregisters it. + * + * @dmxdev: pointer to &struct dmxdev. + */ +void dvb_dmxdev_release(struct dmxdev *dmxdev); + +#endif /* _DMXDEV_H_ */ |