Demux Data Types
****************
-Output for the demux
-====================
-
-.. c:type:: dmx_output
-
-.. tabularcolumns:: |p{5.0cm}|p{12.5cm}|
-
-.. flat-table:: enum dmx_output
- :header-rows: 1
- :stub-columns: 0
-
-
- - .. row 1
-
- - ID
-
- - Description
-
- - .. row 2
-
- - .. _DMX-OUT-DECODER:
-
- DMX_OUT_DECODER
-
- - Streaming directly to decoder.
-
- - .. row 3
-
- - .. _DMX-OUT-TAP:
-
- 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.
-
- - .. row 4
-
- - .. _DMX-OUT-TS-TAP:
-
- 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.
-
- - .. row 5
-
- - .. _DMX-OUT-TSDEMUX-TAP:
-
- DMX_OUT_TSDEMUX_TAP
-
- - Like :ref:`DMX_OUT_TS_TAP <DMX-OUT-TS-TAP>` but retrieved
- from the DMX device.
-
-
-dmx_input_t
-===========
-
-.. c:type:: dmx_input
-
-.. code-block:: c
-
- typedef enum
- {
- DMX_IN_FRONTEND, /* Input from a front-end device. */
- DMX_IN_DVR /* Input from the logical DVR device. */
- } dmx_input_t;
-
-
-dmx_pes_type_t
-==============
-
-.. c:type:: dmx_pes_type
-
-
-.. code-block:: c
-
- typedef enum
- {
- DMX_PES_AUDIO0,
- DMX_PES_VIDEO0,
- DMX_PES_TELETEXT0,
- DMX_PES_SUBTITLE0,
- DMX_PES_PCR0,
-
- DMX_PES_AUDIO1,
- DMX_PES_VIDEO1,
- DMX_PES_TELETEXT1,
- DMX_PES_SUBTITLE1,
- DMX_PES_PCR1,
-
- DMX_PES_AUDIO2,
- DMX_PES_VIDEO2,
- DMX_PES_TELETEXT2,
- DMX_PES_SUBTITLE2,
- DMX_PES_PCR2,
-
- DMX_PES_AUDIO3,
- DMX_PES_VIDEO3,
- DMX_PES_TELETEXT3,
- DMX_PES_SUBTITLE3,
- DMX_PES_PCR3,
-
- DMX_PES_OTHER
- } dmx_pes_type_t;
-
-
-struct dmx_filter
-=================
-
-.. c:type:: dmx_filter
-
-.. code-block:: c
-
- typedef struct dmx_filter
- {
- __u8 filter[DMX_FILTER_SIZE];
- __u8 mask[DMX_FILTER_SIZE];
- __u8 mode[DMX_FILTER_SIZE];
- } dmx_filter_t;
-
-
-.. c:type:: dmx_sct_filter_params
-
-struct dmx_sct_filter_params
-============================
-
-
-.. code-block:: c
-
- struct dmx_sct_filter_params
- {
- __u16 pid;
- dmx_filter_t filter;
- __u32 timeout;
- __u32 flags;
- #define DMX_CHECK_CRC 1
- #define DMX_ONESHOT 2
- #define DMX_IMMEDIATE_START 4
- };
-
-
-struct dmx_pes_filter_params
-============================
-
-.. c:type:: dmx_pes_filter_params
-
-.. code-block:: c
-
- struct dmx_pes_filter_params
- {
- __u16 pid;
- dmx_input_t input;
- dmx_output_t output;
- dmx_pes_type_t pes_type;
- __u32 flags;
- };
-
-struct dmx_stc
-==============
-
-.. c:type:: dmx_stc
-
-.. code-block:: c
-
- 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 */
- };
+.. kernel-doc:: include/uapi/linux/dvb/dmx.h
#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_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_input
-{
- DMX_IN_FRONTEND, /* Input from a front-end device. */
- DMX_IN_DVR /* Input from the logical DVR device. */
+
+/**
+ * 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
-{
+enum dmx_ts_pes {
DMX_PES_AUDIO0,
DMX_PES_VIDEO0,
DMX_PES_TELETEXT0,
#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;
#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;
__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)
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