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media: dvb_demux.h: document functions

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The functions used on dvb_demux.h are largely used on DVB drivers.
Yet, none of them are documented.

No functional changes.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2017-09-20 09:08:20 -04:00
parent 198688cdc1
commit 6128a68dbc
1 changed files with 103 additions and 3 deletions
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106
drivers/media/dvb-core/dvb_demux.h
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@ -232,13 +232,113 @@ struct dvb_demux {
int recording;
};
int dvb_dmx_init(struct dvb_demux *dvbdemux);
void dvb_dmx_release(struct dvb_demux *dvbdemux);
void dvb_dmx_swfilter_packets(struct dvb_demux *dvbdmx, const u8 *buf,
/**
* 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);