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600 lines
23 KiB
600 lines
23 KiB
/* |
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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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*/ |
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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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/* |
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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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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: Back-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; |
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void *priv; |
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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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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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* @buffer_flags: Address where buffer flags are stored. Those are |
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* used to report discontinuity users via DVB |
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* memory mapped API, as defined by |
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* &enum dmx_buffer_flags. |
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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 a 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. |
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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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* |
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* - 0, on success; |
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* |
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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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u32 *buffer_flags); |
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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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* @buffer_flags: Address where buffer flags are stored. Those are |
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* used to report discontinuity users via DVB |
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* memory mapped API, as defined by |
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* &enum dmx_buffer_flags. |
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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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u32 *buffer_flags); |
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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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* @list: list of struct dmx_frontend |
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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 |
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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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* @add_frontend: Registers a connectivity between a demux and a front-end, |
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* i.e., indicates that the demux can be connected via a call to |
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* @connect_frontend to use the given front-end as a TS source. The |
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* client of this function has to allocate dynamic or static memory for |
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* the frontend structure and initialize its fields before calling this |
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* function. This function is normally called during the driver |
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* initialization. The caller must not free the memory of the frontend |
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* struct before successfully calling @remove_frontend. |
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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 @frontend function parameter contains a pointer to the front-end |
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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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* @remove_frontend: Indicates that the given front-end, registered by a call |
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* to @add_frontend, can no longer be connected as a TS source by this |
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* demux. The function should be called when a front-end driver or a demux |
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* driver is removed from the system. If the front-end is in use, the |
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* function fails with the return value of -EBUSY. After successfully |
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* calling this function, the caller can free the memory of the frontend |
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* struct if it was dynamically allocated before the @add_frontend |
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* operation. |
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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 @frontend function parameter contains a pointer to the front-end |
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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 the front-end was not found, |
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* -EINVAL, on bad parameter. |
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* |
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* @get_frontends: Provides the APIs of the front-ends that have been |
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* registered for this demux. Any of the front-ends obtained with this |
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* call can be used as a parameter for @connect_frontend. The include |
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* file demux.h contains the macro DMX_FE_ENTRY() for converting an |
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* element of the generic type struct &list_head * to the type |
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* struct &dmx_frontend *. The caller must not free the memory of any of |
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* the elements obtained via this function call. |
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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 a struct list_head pointer to the list of front-end |
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* interfaces, or NULL in the case of an empty list. |
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* |
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* @connect_frontend: Connects the TS output of the front-end to the input of |
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* the demux. A demux can only be connected to a front-end registered to |
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* the demux with the function @add_frontend. It may or may not be |
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* possible to connect multiple demuxes to the same front-end, depending |
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* on the capabilities of the HW platform. When not used, the front-end |
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* should be released by calling @disconnect_frontend. |
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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 @frontend function parameter contains a pointer to the front-end |
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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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* @disconnect_frontend: Disconnects the demux and a front-end previously |
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* connected by a @connect_frontend call. |
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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: |
|
* 0 on success; |
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* -EINVAL on bad parameter. |
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* |
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* @get_pes_pids: Get the PIDs for DMX_PES_AUDIO0, DMX_PES_VIDEO0, |
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* DMX_PES_TELETEXT0, DMX_PES_SUBTITLE0 and DMX_PES_PCR0. |
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* 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. |
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*/ |
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struct dmx_demux { |
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enum dmx_demux_caps capabilities; |
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struct dmx_frontend *frontend; |
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void *priv; |
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int (*open)(struct dmx_demux *demux); |
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int (*close)(struct dmx_demux *demux); |
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int (*write)(struct dmx_demux *demux, const char __user *buf, |
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size_t count); |
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int (*allocate_ts_feed)(struct dmx_demux *demux, |
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struct dmx_ts_feed **feed, |
|
dmx_ts_cb callback); |
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int (*release_ts_feed)(struct dmx_demux *demux, |
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struct dmx_ts_feed *feed); |
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int (*allocate_section_feed)(struct dmx_demux *demux, |
|
struct dmx_section_feed **feed, |
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dmx_section_cb callback); |
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int (*release_section_feed)(struct dmx_demux *demux, |
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struct dmx_section_feed *feed); |
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int (*add_frontend)(struct dmx_demux *demux, |
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struct dmx_frontend *frontend); |
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int (*remove_frontend)(struct dmx_demux *demux, |
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struct dmx_frontend *frontend); |
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struct list_head *(*get_frontends)(struct dmx_demux *demux); |
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int (*connect_frontend)(struct dmx_demux *demux, |
|
struct dmx_frontend *frontend); |
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int (*disconnect_frontend)(struct dmx_demux *demux); |
|
|
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int (*get_pes_pids)(struct dmx_demux *demux, u16 *pids); |
|
|
|
/* 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); |
|
}; |
|
|
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#endif /* #ifndef __DEMUX_H */
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