1<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Chapter 10. DVB Demux Device</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="LINUX MEDIA INFRASTRUCTURE API"><link rel="up" href="dvbapi.html" title="Part II. LINUX DVB API"><link rel="prev" href="frontend_legacy_dvbv3_api.html" title="DVB Frontend legacy API (a. k. a. DVBv3)"><link rel="next" href="dmx_fcalls.html" title="Demux Function Calls"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 10. DVB Demux Device</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="frontend_legacy_dvbv3_api.html">Prev</a> </td><th width="60%" align="center">Part II. LINUX DVB API</th><td width="20%" align="right"> <a accesskey="n" href="dmx_fcalls.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a name="dvb_demux"></a>Chapter 10. DVB Demux Device</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="section"><a href="dvb_demux.html#dmx_types">Demux Data Types</a></span></dt><dd><dl><dt><span class="section"><a href="dvb_demux.html#dmx-output-t">Output for the demux</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-input-t">dmx_input_t</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-pes-type-t">dmx_pes_type_t</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-filter">struct dmx_filter</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-sct-filter-params">struct dmx_sct_filter_params</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-pes-filter-params">struct dmx_pes_filter_params</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-event">struct dmx_event</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-stc">struct dmx_stc</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-caps">struct dmx_caps</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-source-t">enum dmx_source_t</a></span></dt></dl></dd><dt><span class="section"><a href="dmx_fcalls.html">Demux Function Calls</a></span></dt><dd><dl><dt><span class="section"><a href="dmx_fcalls.html#dmx_fopen">open()</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#dmx_fclose">close()</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#dmx_fread">read()</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#dmx_fwrite">write()</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_START">DMX_START</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_STOP">DMX_STOP</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_SET_FILTER">DMX_SET_FILTER</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_SET_PES_FILTER">DMX_SET_PES_FILTER</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_SET_BUFFER_SIZE">DMX_SET_BUFFER_SIZE</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_GET_EVENT">DMX_GET_EVENT</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_GET_STC">DMX_GET_STC</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_GET_PES_PIDS">DMX_GET_PES_PIDS</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_GET_CAPS">DMX_GET_CAPS</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_SET_SOURCE">DMX_SET_SOURCE</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_ADD_PID">DMX_ADD_PID</a></span></dt><dt><span class="section"><a href="dmx_fcalls.html#DMX_REMOVE_PID">DMX_REMOVE_PID</a></span></dt></dl></dd></dl></div><p>The DVB demux device controls the filters of the DVB hardware/software. It can be 2accessed through <code class="constant">/dev/adapter?/demux?</code>. Data types and and ioctl definitions can be 3accessed by including <code class="constant">linux/dvb/dmx.h</code> in your application. 4</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="dmx_types"></a>Demux Data Types</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="section"><a href="dvb_demux.html#dmx-output-t">Output for the demux</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-input-t">dmx_input_t</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-pes-type-t">dmx_pes_type_t</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-filter">struct dmx_filter</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-sct-filter-params">struct dmx_sct_filter_params</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-pes-filter-params">struct dmx_pes_filter_params</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-event">struct dmx_event</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-stc">struct dmx_stc</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-caps">struct dmx_caps</a></span></dt><dt><span class="section"><a href="dvb_demux.html#dmx-source-t">enum dmx_source_t</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="dmx-output-t"></a>Output for the demux</h3></div></div></div><div class="table"><a name="dmx-output"></a><p class="title"><b>Table 10.1. enum dmx_output</b></p><div class="table-contents"><table summary="enum dmx_output" width="100%" border="0"><colgroup><col class="c1"><col class="c2"></colgroup><thead><tr><th>ID</th><th>Description</th></tr></thead><tbody valign="top"><tr><td align="char" valign="top"><a name="DMX-OUT-DECODER"></a>DMX_OUT_DECODER</td><td valign="top">Streaming directly to decoder.</td></tr><tr><td align="char" valign="top"><a name="DMX-OUT-TAP"></a>DMX_OUT_TAP</td><td valign="top">Output going to a memory buffer (to be retrieved via the 5 read command). Delivers the stream output to the demux 6 device on which the ioctl is called.</td></tr><tr><td align="char" valign="top"><a name="DMX-OUT-TS-TAP"></a>DMX_OUT_TS_TAP</td><td valign="top">Output multiplexed into a new TS (to be retrieved by 7 reading from the logical DVR device). Routes output to the 8 logical DVR device <code class="constant">/dev/dvb/adapter?/dvr?</code>, 9 which delivers a TS multiplexed from all filters for which 10 <code class="constant">DMX_OUT_TS_TAP</code> was specified.</td></tr><tr><td align="char" valign="top"><a name="DMX-OUT-TSDEMUX-TAP"></a>DMX_OUT_TSDEMUX_TAP</td><td valign="top">Like <a class="link" href="dvb_demux.html#DMX-OUT-TS-TAP"><code class="constant">DMX_OUT_TS_TAP</code></a> but retrieved from the DMX 11 device.</td></tr></tbody></table></div></div><br class="table-break"></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="dmx-input-t"></a>dmx_input_t</h3></div></div></div><pre class="programlisting"> 12typedef enum 13{ 14 DMX_IN_FRONTEND, /⋆ Input from a front-end device. ⋆/ 15 DMX_IN_DVR /⋆ Input from the logical DVR device. ⋆/ 16} dmx_input_t; 17</pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="dmx-pes-type-t"></a>dmx_pes_type_t</h3></div></div></div><pre class="programlisting"> 18typedef enum 19{ 20 DMX_PES_AUDIO0, 21 DMX_PES_VIDEO0, 22 DMX_PES_TELETEXT0, 23 DMX_PES_SUBTITLE0, 24 DMX_PES_PCR0, 25 26 DMX_PES_AUDIO1, 27 DMX_PES_VIDEO1, 28 DMX_PES_TELETEXT1, 29 DMX_PES_SUBTITLE1, 30 DMX_PES_PCR1, 31 32 DMX_PES_AUDIO2, 33 DMX_PES_VIDEO2, 34 DMX_PES_TELETEXT2, 35 DMX_PES_SUBTITLE2, 36 DMX_PES_PCR2, 37 38 DMX_PES_AUDIO3, 39 DMX_PES_VIDEO3, 40 DMX_PES_TELETEXT3, 41 DMX_PES_SUBTITLE3, 42 DMX_PES_PCR3, 43 44 DMX_PES_OTHER 45} dmx_pes_type_t; 46</pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="dmx-filter"></a>struct dmx_filter</h3></div></div></div><pre class="programlisting"> 47 typedef struct dmx_filter 48{ 49 __u8 filter[DMX_FILTER_SIZE]; 50 __u8 mask[DMX_FILTER_SIZE]; 51 __u8 mode[DMX_FILTER_SIZE]; 52} dmx_filter_t; 53</pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="dmx-sct-filter-params"></a>struct dmx_sct_filter_params</h3></div></div></div><pre class="programlisting"> 54struct dmx_sct_filter_params 55{ 56 __u16 pid; 57 dmx_filter_t filter; 58 __u32 timeout; 59 __u32 flags; 60#define DMX_CHECK_CRC 1 61#define DMX_ONESHOT 2 62#define DMX_IMMEDIATE_START 4 63#define DMX_KERNEL_CLIENT 0x8000 64}; 65</pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="dmx-pes-filter-params"></a>struct dmx_pes_filter_params</h3></div></div></div><pre class="programlisting"> 66struct dmx_pes_filter_params 67{ 68 __u16 pid; 69 dmx_input_t input; 70 dmx_output_t output; 71 dmx_pes_type_t pes_type; 72 __u32 flags; 73}; 74</pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="dmx-event"></a>struct dmx_event</h3></div></div></div><pre class="programlisting"> 75 struct dmx_event 76 { 77 dmx_event_t event; 78 time_t timeStamp; 79 union 80 { 81 dmx_scrambling_status_t scrambling; 82 } u; 83 }; 84</pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="dmx-stc"></a>struct dmx_stc</h3></div></div></div><pre class="programlisting"> 85struct dmx_stc { 86 unsigned int num; /⋆ input : which STC? 0..N ⋆/ 87 unsigned int base; /⋆ output: divisor for stc to get 90 kHz clock ⋆/ 88 __u64 stc; /⋆ output: stc in 'base'⋆90 kHz units ⋆/ 89}; 90</pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="dmx-caps"></a>struct dmx_caps</h3></div></div></div><pre class="programlisting"> 91 typedef struct dmx_caps { 92 __u32 caps; 93 int num_decoders; 94} dmx_caps_t; 95</pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="dmx-source-t"></a>enum dmx_source_t</h3></div></div></div><pre class="programlisting"> 96typedef enum { 97 DMX_SOURCE_FRONT0 = 0, 98 DMX_SOURCE_FRONT1, 99 DMX_SOURCE_FRONT2, 100 DMX_SOURCE_FRONT3, 101 DMX_SOURCE_DVR0 = 16, 102 DMX_SOURCE_DVR1, 103 DMX_SOURCE_DVR2, 104 DMX_SOURCE_DVR3 105} dmx_source_t; 106</pre></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="frontend_legacy_dvbv3_api.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="dvbapi.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="dmx_fcalls.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">DVB Frontend legacy API (a. k. a. 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