383 lines
9.5 KiB
ReStructuredText
383 lines
9.5 KiB
ReStructuredText
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.. -*- coding: utf-8; mode: rst -*-
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.. _dvb_examples:
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********
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Examples
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********
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In this section we would like to present some examples for using the DVB
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API.
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.. note::
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This section is out of date, and the code below won't even
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compile. Please refer to the
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`libdvbv5 <https://linuxtv.org/docs/libdvbv5/index.html>`__ for
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updated/recommended examples.
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.. _tuning:
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Example: Tuning
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===============
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We will start with a generic tuning subroutine that uses the frontend
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and SEC, as well as the demux devices. The example is given for QPSK
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tuners, but can easily be adjusted for QAM.
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.. code-block:: c
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <time.h>
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#include <unistd.h>
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#include <linux/dvb/dmx.h>
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#include <linux/dvb/frontend.h>
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#include <linux/dvb/sec.h>
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#include <sys/poll.h>
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#define DMX "/dev/dvb/adapter0/demux1"
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#define FRONT "/dev/dvb/adapter0/frontend1"
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#define SEC "/dev/dvb/adapter0/sec1"
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/* routine for checking if we have a signal and other status information*/
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int FEReadStatus(int fd, fe_status_t *stat)
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{
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int ans;
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if ( (ans = ioctl(fd,FE_READ_STATUS,stat) < 0)){
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perror("FE READ STATUS: ");
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return -1;
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}
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if (*stat & FE_HAS_POWER)
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printf("FE HAS POWER\\n");
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if (*stat & FE_HAS_SIGNAL)
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printf("FE HAS SIGNAL\\n");
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if (*stat & FE_SPECTRUM_INV)
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printf("SPEKTRUM INV\\n");
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return 0;
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}
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/* tune qpsk */
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/* freq: frequency of transponder */
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/* vpid, apid, tpid: PIDs of video, audio and teletext TS packets */
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/* diseqc: DiSEqC address of the used LNB */
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/* pol: Polarisation */
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/* srate: Symbol Rate */
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/* fec. FEC */
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/* lnb_lof1: local frequency of lower LNB band */
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/* lnb_lof2: local frequency of upper LNB band */
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/* lnb_slof: switch frequency of LNB */
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int set_qpsk_channel(int freq, int vpid, int apid, int tpid,
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int diseqc, int pol, int srate, int fec, int lnb_lof1,
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int lnb_lof2, int lnb_slof)
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{
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struct secCommand scmd;
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struct secCmdSequence scmds;
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struct dmx_pes_filter_params pesFilterParams;
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FrontendParameters frp;
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struct pollfd pfd[1];
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FrontendEvent event;
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int demux1, demux2, demux3, front;
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frequency = (uint32_t) freq;
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symbolrate = (uint32_t) srate;
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if((front = open(FRONT,O_RDWR)) < 0){
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perror("FRONTEND DEVICE: ");
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return -1;
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}
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if((sec = open(SEC,O_RDWR)) < 0){
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perror("SEC DEVICE: ");
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return -1;
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}
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if (demux1 < 0){
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if ((demux1=open(DMX, O_RDWR|O_NONBLOCK))
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< 0){
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perror("DEMUX DEVICE: ");
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return -1;
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}
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}
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if (demux2 < 0){
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if ((demux2=open(DMX, O_RDWR|O_NONBLOCK))
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< 0){
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perror("DEMUX DEVICE: ");
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return -1;
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}
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}
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if (demux3 < 0){
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if ((demux3=open(DMX, O_RDWR|O_NONBLOCK))
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< 0){
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perror("DEMUX DEVICE: ");
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return -1;
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}
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}
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if (freq < lnb_slof) {
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frp.Frequency = (freq - lnb_lof1);
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scmds.continuousTone = SEC_TONE_OFF;
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} else {
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frp.Frequency = (freq - lnb_lof2);
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scmds.continuousTone = SEC_TONE_ON;
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}
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frp.Inversion = INVERSION_AUTO;
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if (pol) scmds.voltage = SEC_VOLTAGE_18;
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else scmds.voltage = SEC_VOLTAGE_13;
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scmd.type=0;
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scmd.u.diseqc.addr=0x10;
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scmd.u.diseqc.cmd=0x38;
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scmd.u.diseqc.numParams=1;
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scmd.u.diseqc.params[0] = 0xF0 | ((diseqc * 4) & 0x0F) |
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(scmds.continuousTone == SEC_TONE_ON ? 1 : 0) |
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(scmds.voltage==SEC_VOLTAGE_18 ? 2 : 0);
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scmds.miniCommand=SEC_MINI_NONE;
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scmds.numCommands=1;
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scmds.commands=&scmd;
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if (ioctl(sec, SEC_SEND_SEQUENCE, &scmds) < 0){
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perror("SEC SEND: ");
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return -1;
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}
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if (ioctl(sec, SEC_SEND_SEQUENCE, &scmds) < 0){
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perror("SEC SEND: ");
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return -1;
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}
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frp.u.qpsk.SymbolRate = srate;
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frp.u.qpsk.FEC_inner = fec;
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if (ioctl(front, FE_SET_FRONTEND, &frp) < 0){
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perror("QPSK TUNE: ");
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return -1;
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}
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pfd[0].fd = front;
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pfd[0].events = POLLIN;
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if (poll(pfd,1,3000)){
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if (pfd[0].revents & POLLIN){
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printf("Getting QPSK event\\n");
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if ( ioctl(front, FE_GET_EVENT, &event)
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== -EOVERFLOW){
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perror("qpsk get event");
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return -1;
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}
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printf("Received ");
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switch(event.type){
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case FE_UNEXPECTED_EV:
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printf("unexpected event\\n");
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return -1;
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case FE_FAILURE_EV:
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printf("failure event\\n");
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return -1;
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case FE_COMPLETION_EV:
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printf("completion event\\n");
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}
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}
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}
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pesFilterParams.pid = vpid;
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pesFilterParams.input = DMX_IN_FRONTEND;
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pesFilterParams.output = DMX_OUT_DECODER;
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pesFilterParams.pes_type = DMX_PES_VIDEO;
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pesFilterParams.flags = DMX_IMMEDIATE_START;
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if (ioctl(demux1, DMX_SET_PES_FILTER, &pesFilterParams) < 0){
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perror("set_vpid");
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return -1;
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}
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pesFilterParams.pid = apid;
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pesFilterParams.input = DMX_IN_FRONTEND;
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pesFilterParams.output = DMX_OUT_DECODER;
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pesFilterParams.pes_type = DMX_PES_AUDIO;
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pesFilterParams.flags = DMX_IMMEDIATE_START;
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if (ioctl(demux2, DMX_SET_PES_FILTER, &pesFilterParams) < 0){
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perror("set_apid");
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return -1;
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}
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pesFilterParams.pid = tpid;
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pesFilterParams.input = DMX_IN_FRONTEND;
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pesFilterParams.output = DMX_OUT_DECODER;
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pesFilterParams.pes_type = DMX_PES_TELETEXT;
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pesFilterParams.flags = DMX_IMMEDIATE_START;
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if (ioctl(demux3, DMX_SET_PES_FILTER, &pesFilterParams) < 0){
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perror("set_tpid");
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return -1;
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}
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return has_signal(fds);
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}
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The program assumes that you are using a universal LNB and a standard
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DiSEqC switch with up to 4 addresses. Of course, you could build in some
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more checking if tuning was successful and maybe try to repeat the
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tuning process. Depending on the external hardware, i.e. LNB and DiSEqC
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switch, and weather conditions this may be necessary.
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.. _the_dvr_device:
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Example: The DVR device
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========================
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The following program code shows how to use the DVR device for
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recording.
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.. code-block:: c
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <time.h>
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#include <unistd.h>
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#include <linux/dvb/dmx.h>
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#include <linux/dvb/video.h>
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#include <sys/poll.h>
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#define DVR "/dev/dvb/adapter0/dvr1"
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#define AUDIO "/dev/dvb/adapter0/audio1"
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#define VIDEO "/dev/dvb/adapter0/video1"
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#define BUFFY (188*20)
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#define MAX_LENGTH (1024*1024*5) /* record 5MB */
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/* switch the demuxes to recording, assuming the transponder is tuned */
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/* demux1, demux2: file descriptor of video and audio filters */
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/* vpid, apid: PIDs of video and audio channels */
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int switch_to_record(int demux1, int demux2, uint16_t vpid, uint16_t apid)
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{
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struct dmx_pes_filter_params pesFilterParams;
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if (demux1 < 0){
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if ((demux1=open(DMX, O_RDWR|O_NONBLOCK))
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< 0){
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perror("DEMUX DEVICE: ");
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return -1;
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}
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}
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if (demux2 < 0){
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if ((demux2=open(DMX, O_RDWR|O_NONBLOCK))
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< 0){
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perror("DEMUX DEVICE: ");
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return -1;
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}
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}
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pesFilterParams.pid = vpid;
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pesFilterParams.input = DMX_IN_FRONTEND;
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pesFilterParams.output = DMX_OUT_TS_TAP;
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pesFilterParams.pes_type = DMX_PES_VIDEO;
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pesFilterParams.flags = DMX_IMMEDIATE_START;
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if (ioctl(demux1, DMX_SET_PES_FILTER, &pesFilterParams) < 0){
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perror("DEMUX DEVICE");
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return -1;
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}
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pesFilterParams.pid = apid;
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pesFilterParams.input = DMX_IN_FRONTEND;
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pesFilterParams.output = DMX_OUT_TS_TAP;
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pesFilterParams.pes_type = DMX_PES_AUDIO;
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pesFilterParams.flags = DMX_IMMEDIATE_START;
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if (ioctl(demux2, DMX_SET_PES_FILTER, &pesFilterParams) < 0){
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perror("DEMUX DEVICE");
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return -1;
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}
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return 0;
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}
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/* start recording MAX_LENGTH , assuming the transponder is tuned */
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/* demux1, demux2: file descriptor of video and audio filters */
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/* vpid, apid: PIDs of video and audio channels */
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int record_dvr(int demux1, int demux2, uint16_t vpid, uint16_t apid)
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{
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int i;
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int len;
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int written;
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uint8_t buf[BUFFY];
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uint64_t length;
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struct pollfd pfd[1];
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int dvr, dvr_out;
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/* open dvr device */
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if ((dvr = open(DVR, O_RDONLY|O_NONBLOCK)) < 0){
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perror("DVR DEVICE");
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return -1;
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}
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/* switch video and audio demuxes to dvr */
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printf ("Switching dvr on\\n");
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i = switch_to_record(demux1, demux2, vpid, apid);
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printf("finished: ");
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printf("Recording %2.0f MB of test file in TS format\\n",
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MAX_LENGTH/(1024.0*1024.0));
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length = 0;
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/* open output file */
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if ((dvr_out = open(DVR_FILE,O_WRONLY|O_CREAT
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|O_TRUNC, S_IRUSR|S_IWUSR
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|S_IRGRP|S_IWGRP|S_IROTH|
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S_IWOTH)) < 0){
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perror("Can't open file for dvr test");
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return -1;
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}
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pfd[0].fd = dvr;
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pfd[0].events = POLLIN;
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/* poll for dvr data and write to file */
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while (length < MAX_LENGTH ) {
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if (poll(pfd,1,1)){
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if (pfd[0].revents & POLLIN){
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len = read(dvr, buf, BUFFY);
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if (len < 0){
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perror("recording");
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return -1;
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}
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if (len > 0){
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written = 0;
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while (written < len)
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written +=
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write (dvr_out,
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buf, len);
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length += len;
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printf("written %2.0f MB\\r",
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|
|
length/1024./1024.);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|