3.1. Demux Data Types¶

enum dmx_output¶: Output for the demux.

Constants

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_input¶: Input from the demux.

Constants

DMX_IN_FRONTEND: Input from a front-end device.
DMX_IN_DVR: Input from the logical DVR device.

enum dmx_ts_pes¶: type of the PES filter.

Constants

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.

struct dmx_filter¶: Specifies a section header filter.

Definition

struct dmx_filter {
  __u8 filter;
  __u8 mask;
  __u8 mode;
};

Members

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_sct_filter_params¶: Specifies a section filter.

Definition

struct dmx_sct_filter_params {
  __u16 pid;
  struct dmx_filter filter;
  __u32 timeout;
  __u32 flags;
#define DMX_CHECK_CRC       1
#define DMX_ONESHOT         2
#define DMX_IMMEDIATE_START 4
};

Members

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.

Description

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 DMX_START.

struct dmx_pes_filter_params¶: Specifies Packetized Elementary Stream (PES) filter parameters.

Definition

struct dmx_pes_filter_params {
  __u16 pid;
  enum dmx_input input;
  enum dmx_output output;
  enum dmx_ts_pes pes_type;
  __u32 flags;
};

Members

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_stc¶: Stores System Time Counter (STC) information.

Definition

struct dmx_stc {
  unsigned int num;
  unsigned int base;
  __u64 stc;
};

Members

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.