demux(3)

📦
version 1.32.0 · 2 versions
, in fedora 43

💖 NAME 💖

demux — Digital TV demux ✨

it's giving "the thing that pulls streams apart so you can actually watch them" 🎀

🦋 SYNOPSIS 🦋

🌸 Files 🌸

  • file dvb-demux.h — Provides interfaces to deal with DVB demux. 🫶

🌈 Functions 🌈

  • int dvb_dmx_open (int adapter, int demux) — Opens a DVB demux in read/write mode.
  • void dvb_dmx_close (int dmx_fd) — Stops the DMX filter for the file descriptor and closes.
  • void dvb_dmx_stop (int dmx_fd) — Stops the DMX filter for a given file descriptor.
  • int dvb_set_pesfilter (int dmxfd, int pid, dmx_pes_type_t type, dmx_output_t output, int buffersize) — Start a filter for a MPEG-TS Packetized Elementary Stream (PES)
  • int dvb_set_section_filter (int dmxfd, int pid, unsigned filtsize, unsigned char *filter, unsigned char *mask, unsigned char *mode, unsigned int flags) — Sets a MPEG-TS section filter.
  • int dvb_get_pmt_pid (int dmxfd, int sid) — read the contents of the MPEG-TS PAT table, seeking for an specific service ID

💅 Detailed Description 💅

okay so bestie. the original page leaves this section completely empty. nothing. not a crumb. it's giving ghosted 😭 so we're moving right along, no notes, periodt.

🔥 Function Documentation 🔥

void dvb_dmx_close (int dmx_fd)

Stops the DMX filter for the file descriptor and closes. 🎀

Parameters

  • dmx_fd — File descriptor to close

This is a wrapper function to close().

⚠️ Warning: Deprecated. Please use dvb_dev_close() instead. (she's retired, love her, but retired 💀)

int dvb_dmx_open (int adapter, int demux)

Opens a DVB demux in read/write mode. ✨

Parameters

  • adapter — DVB adapter number to open
  • demux — DVB demux number to open

This is a wrapper function to open(). File is always opened in blocking mode.

Returns

Returns a file descriptor on success, -1 otherwise.

⚠️ Warning: Deprecated. Please use dvb_dev_open() instead. 👑

void dvb_dmx_stop (int dmx_fd)

Stops the DMX filter for a given file descriptor. 🛑

Parameters

  • dmx_fd — File descriptor to close

This is a wrapper function to DMX_STOP ioctl. See http://linuxtv.org/downloads/v4l-dvb-apis/dvb_demux.html for more details. (iykyk, the docs live there 📚)

⚠️ Warning: Deprecated. Please use dvb_dev_dmx_stop() instead.

int dvb_get_pmt_pid (int dmxfd, int sid)

read the contents of the MPEG-TS PAT table, seeking for an specific service ID 🔍

Parameters

  • dmxfd — File descriptor for the demux device
  • sid — Session ID to seeking
⚠️ Warning: Deprecated. Please use dvb_get_pmt_pid() instead.

(not her telling you to use herself instead of her. main character energy honestly 🙈 that's exactly what the source says, we don't make the rules)

Returns

At return, it returns a negative value if error or the PID associated with the desired Session ID.

⚠️ Warning: This function currently assumes that the PAT fits into one session. bestie, if your PAT is thicc and needs more than one session, this is not the function for you 😭

int dvb_set_pesfilter (int dmxfd, int pid, dmx_pes_type_t type, dmx_output_t output, int buffersize)

Start a filter for a MPEG-TS Packetized Elementary Stream (PES) 🌊

Parameters

  • dmxfd — File descriptor for the demux device
  • pid — Program ID to filter. Use 0x2000 to select all PIDs
  • type — type of the PID (DMX_PES_VIDEO, DMX_PES_AUDIO, DMX_PES_OTHER, etc).
  • output — Where the data will be output (DMX_OUT_TS_TAP, DMX_OUT_DECODER, etc).
  • buffersize — Size of the buffer to be allocated to store the filtered data.

This is a wrapper function for DMX_SET_PES_FILTER ioctl. See http://linuxtv.org/downloads/v4l-dvb-apis/dvb_demux.html for more details.

Returns

Retuns zero on success, -1 otherwise.

⚠️ Warning: Deprecated. Please use dvb_dev_dmx_set_pesfilter() instead. the glow-up is real ✨

int dvb_set_section_filter (int dmxfd, int pid, unsigned filtsize, unsigned char * filter, unsigned char * mask, unsigned char * mode, unsigned int flags)

Sets a MPEG-TS section filter. 🎯

Parameters

  • dmxfd — File descriptor for the demux device
  • pid — Program ID to filter. Use 0x2000 to select all PIDs
  • filtsize — Size of the filter (up to 18 btyes) 🙈 (the typo is the source's, not mine, we're just being faithful)
  • filter — data to filter. Can be NULL or should have filtsize length
  • mask — filter mask. Can be NULL or should have filtsize length
  • mode — mode mask. Can be NULL or should have filtsize length
  • flags — flags for set filter (DMX_CHECK_CRC,DMX_ONESHOT, DMX_IMMEDIATE_START).

This is a wrapper function for DMX_SET_FILTER ioctl. See http://linuxtv.org/downloads/v4l-dvb-apis/dvb_demux.html for more details.

⚠️ Warning: Deprecated. Please use dvb_dev_dmx_set_pesfilter() instead. (yes, even for the section filter. that's literally what it says, we don't ask questions 💀)

Returns

Retuns zero on success, -1 otherwise.

👑 Author 👑

Generated automatically by Doxygen for libdvbv5 from the source code. 🤖 (no human wrote this and honestly? slay, it did great)

and that's the whole page bestie 🫶 this one came to you from libdvbv5, Version 1.32.0 — and that footer said demux(3), so mwah, stay filtered, don't forget to dvb_dev_* your deprecated calls, and go touch some MPEG-TS 💖✨🌸

📦 where this page comes from