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media: dmx.h: add kernel-doc markups and use it at Documentation/

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The demux documentation is pretty poor nowadays: most of the
structs and enums aren't documented at all.

Add proper kernel-doc markups for them and use it.

Now, the demux API data structures are fully documented :-)

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab
2017-08-31 12:28:52 -04:00
parent 2889017c92
commit bb98e6d280
3 changed files with 122 additions and 199 deletions
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143
include/uapi/linux/dvb/dmx.h
View File

@@ -32,26 +32,74 @@
#define DMX_FILTER_SIZE 16
enum dmx_output
{
DMX_OUT_DECODER, /* Streaming directly to decoder. */
DMX_OUT_TAP, /* Output going to a memory buffer */
/* (to be retrieved via the read command).*/
DMX_OUT_TS_TAP, /* Output multiplexed into a new TS */
/* (to be retrieved by reading from the */
/* logical DVR device). */
DMX_OUT_TSDEMUX_TAP /* Like TS_TAP but retrieved from the DMX device */
};
enum dmx_input
{
DMX_IN_FRONTEND, /* Input from a front-end device. */
DMX_IN_DVR /* Input from the logical DVR device. */
/**
* enum dmx_output - Output for the demux.
*
* @DMX_OUT_DECODER:
* Streaming directly to decoder.
* @DMX_OUT_TAP:
* Output going to a memory buffer (to be retrieved via the read command).
* Delivers the stream output to the demux device on which the ioctl
* is called.
* @DMX_OUT_TS_TAP:
* Output multiplexed into a new TS (to be retrieved by reading from the
* logical DVR device). Routes output to the logical DVR device
* ``/dev/dvb/adapter?/dvr?``, which delivers a TS multiplexed from all
* filters for which @DMX_OUT_TS_TAP was specified.
* @DMX_OUT_TSDEMUX_TAP:
* Like @DMX_OUT_TS_TAP but retrieved from the DMX device.
*/
enum dmx_output {
DMX_OUT_DECODER,
DMX_OUT_TAP,
DMX_OUT_TS_TAP,
DMX_OUT_TSDEMUX_TAP
};
enum dmx_ts_pes
{
/**
* enum dmx_input - Input from the demux.
*
* @DMX_IN_FRONTEND: Input from a front-end device.
* @DMX_IN_DVR: Input from the logical DVR device.
*/
enum dmx_input {
DMX_IN_FRONTEND,
DMX_IN_DVR
};
/**
* enum dmx_ts_pes - type of the PES filter.
*
* @DMX_PES_AUDIO0: first audio PID. Also referred as @DMX_PES_AUDIO.
* @DMX_PES_VIDEO0: first video PID. Also referred as @DMX_PES_VIDEO.
* @DMX_PES_TELETEXT0: first teletext PID. Also referred as @DMX_PES_TELETEXT.
* @DMX_PES_SUBTITLE0: first subtitle PID. Also referred as @DMX_PES_SUBTITLE.
* @DMX_PES_PCR0: first Program Clock Reference PID.
* Also referred as @DMX_PES_PCR.
*
* @DMX_PES_AUDIO1: second audio PID.
* @DMX_PES_VIDEO1: second video PID.
* @DMX_PES_TELETEXT1: second teletext PID.
* @DMX_PES_SUBTITLE1: second subtitle PID.
* @DMX_PES_PCR1: second Program Clock Reference PID.
*
* @DMX_PES_AUDIO2: third audio PID.
* @DMX_PES_VIDEO2: third video PID.
* @DMX_PES_TELETEXT2: third teletext PID.
* @DMX_PES_SUBTITLE2: third subtitle PID.
* @DMX_PES_PCR2: third Program Clock Reference PID.
*
* @DMX_PES_AUDIO3: fourth audio PID.
* @DMX_PES_VIDEO3: fourth video PID.
* @DMX_PES_TELETEXT3: fourth teletext PID.
* @DMX_PES_SUBTITLE3: fourth subtitle PID.
* @DMX_PES_PCR3: fourth Program Clock Reference PID.
*
* @DMX_PES_OTHER: any other PID.
*/
enum dmx_ts_pes {
DMX_PES_AUDIO0,
DMX_PES_VIDEO0,
DMX_PES_TELETEXT0,
@@ -86,16 +134,42 @@ enum dmx_ts_pes
#define DMX_PES_PCR DMX_PES_PCR0
struct dmx_filter
{
/**
* struct dmx_filter - Specifies a section header filter.
*
* @filter: bit array with bits to be matched at the section header.
* @mask: bits that are valid at the filter bit array.
* @mode: mode of match: if bit is zero, it will match if equal (positive
* match); if bit is one, it will match if the bit is negated.
*
* Note: All arrays in this struct have a size of DMX_FILTER_SIZE (16 bytes).
*/
struct dmx_filter {
__u8 filter[DMX_FILTER_SIZE];
__u8 mask[DMX_FILTER_SIZE];
__u8 mode[DMX_FILTER_SIZE];
};
struct dmx_sct_filter_params
{
/**
* struct dmx_sct_filter_params - Specifies a section filter.
*
* @pid: PID to be filtered.
* @filter: section header filter, as defined by &struct dmx_filter.
* @timeout: maximum time to filter, in milliseconds.
* @flags: extra flags for the section filter.
*
* Carries the configuration for a MPEG-TS section filter.
*
* The @flags can be:
*
* - %DMX_CHECK_CRC - only deliver sections where the CRC check succeeded;
* - %DMX_ONESHOT - disable the section filter after one section
* has been delivered;
* - %DMX_IMMEDIATE_START - Start filter immediately without requiring a
* :ref:`DMX_START`.
*/
struct dmx_sct_filter_params {
__u16 pid;
struct dmx_filter filter;
__u32 timeout;
@@ -105,7 +179,16 @@ struct dmx_sct_filter_params
#define DMX_IMMEDIATE_START 4
};
/**
* struct dmx_pes_filter_params - Specifies Packetized Elementary Stream (PES)
* filter parameters.
*
* @pid: PID to be filtered.
* @input: Demux input, as specified by &enum dmx_input.
* @output: Demux output, as specified by &enum dmx_output.
* @pes_type: Type of the pes filter, as specified by &enum dmx_pes_type.
* @flags: Demux PES flags.
*/
struct dmx_pes_filter_params
{
__u16 pid;
@@ -115,11 +198,17 @@ struct dmx_pes_filter_params
__u32 flags;
};
/**
* struct dmx_stc - Stores System Time Counter (STC) information.
*
* @num: input data: number of the STC, from 0 to N.
* @base: output: divisor for STC to get 90 kHz clock.
* @stc: output: stc in @base * 90 kHz units.
*/
struct dmx_stc {
unsigned int num; /* input : which STC? 0..N */
unsigned int base; /* output: divisor for stc to get 90 kHz clock */
__u64 stc; /* output: stc in 'base'*90 kHz units */
unsigned int num;
unsigned int base;
__u64 stc;
};
#define DMX_START _IO('o', 41)