frodovdr
/
vdr-plugin-iptv
mirror of https://github.com/rofafor/vdr-plugin-iptv.git
1
0
Fork 0
Code Issues Releases Wiki Activity
vdr-plugin-iptv/sectionfilter.c

311 lines
8.3 KiB
C
Raw Blame History

/*
* sectionfilter.c: IPTV plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
* $Id: sectionfilter.c,v 1.12 2007/10/20 20:27:59 ajhseppa Exp $
*/
#include "sectionfilter.h"
#include "statistics.h"
#define IPTV_FILTER_FILENAME "/tmp/vdr-iptv%d.filter%d"
cIptvSectionFilter::cIptvSectionFilter(int Index, int devInd,
u_short Pid, u_char Tid, u_char Mask)
: pusi_seen(0),
feedcc(0),
doneq(0),
secbuf(NULL),
secbufp(0),
seclen(0),
tsfeedp(0),
pid(Pid),
id(Index)
{
//debug("cIptvSectionFilter::cIptvSectionFilter(%d)\n", Index);
memset(secbuf_base, '\0', sizeof(secbuf_base));
memset(filter_value, '\0', sizeof(filter_value));
memset(filter_mask, '\0', sizeof(filter_mask));
memset(filter_mode, '\0', sizeof(filter_mode));
memset(maskandmode, '\0', sizeof(maskandmode));
memset(maskandnotmode, '\0', sizeof(maskandnotmode));
memset(pipeName, '\0', sizeof(pipeName));
SetPipeName(devInd);
filter_value[0] = Tid;
filter_mask[0] = Mask;
// Invert the filter
for (int i = 0; i < DMX_MAX_FILTER_SIZE; ++i) {
filter_value[i] ^= 0xff;
}
uint8_t mask, mode, local_doneq = 0;
for (int i = 0; i < DMX_MAX_FILTER_SIZE; i++) {
mode = filter_mode[i];
mask = filter_mask[i];
maskandmode[i] = mask & mode;
local_doneq |= maskandnotmode[i] = mask & ~mode;
}
doneq = local_doneq ? 1 : 0;
struct stat sb;
stat(pipeName, &sb);
if (S_ISFIFO(sb.st_mode))
unlink(pipeName);
int err = mknod(pipeName, 0644 | S_IFIFO, 0);
if (err < 0) {
char tmp[64];
error("ERROR: mknod(): %s", strerror_r(errno, tmp, sizeof(tmp)));
return;
}
// Create descriptors
fifoDescriptor = open(pipeName, O_RDWR | O_NONBLOCK);
readDescriptor = open(pipeName, O_RDONLY | O_NONBLOCK);
}
cIptvSectionFilter::~cIptvSectionFilter()
{
//debug("cIptvSectionFilter::~cIptvSectionfilter(%d)\n", id);
close(fifoDescriptor);
close(readDescriptor);
unlink(pipeName);
memset(pipeName, '\0', sizeof(pipeName));
fifoDescriptor = -1;
readDescriptor = -1;
}
void cIptvSectionFilter::SetPipeName(int deviceIndex)
{
snprintf(pipeName, sizeof(pipeName), IPTV_FILTER_FILENAME, deviceIndex, id);
}
int cIptvSectionFilter::GetReadDesc()
{
return readDescriptor;
}
inline uint16_t cIptvSectionFilter::section_length(const uint8_t *buf)
{
return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
}
int cIptvSectionFilter::dmxdev_section_callback(const uint8_t *buffer1, size_t buffer1_len,
const uint8_t *buffer2, size_t buffer2_len,
enum dmx_success success)
{
// See if there is data in the fifo
int retval = selectSingleDesc(fifoDescriptor, 0, false);
// There is no data in the fifo, more can be written
if (!retval) {
#ifdef DEBUG_PRINTF
printf("id = %d, pid %d would now write %d data to buffer\n", id, pid, buffer1_len);
for (unsigned int i = 0; i < buffer1_len; ++i)
printf("0x%X ", buffer1[i]);
printf("\n");
#endif
retval = write(fifoDescriptor, buffer1, buffer1_len);
if (retval < 0) {
char tmp[64];
error("ERROR: write(): %s", strerror_r(errno, tmp, sizeof(tmp)));
}
// Update statistics
AddStatistic(retval, 1);
}
#ifdef DEBUG_PRINTF
else if (retval)
printf("id %d pid %d data is already present\n", id, pid);
#endif
return 0;
}
void cIptvSectionFilter::demux_swfilter_section_new()
{
#ifdef DEMUX_SECTION_LOSS_LOG
if (secbufp < tsfeedp) {
int i, n = tsfeedp - secbufp;
/*
* Section padding is done with 0xff bytes entirely.
* Due to speed reasons, we won't check all of them
* but just first and last.
*/
if (secbuf[0] != 0xff || secbuf[n - 1] != 0xff) {
printf("sectionfilter.c section ts padding loss: %d/%d\n",
n, tsfeedp);
printf("sectionfilter.c pad data:");
for (i = 0; i < n; i++)
printf(" %02x", secbuf[i]);
printf("\n");
}
}
#endif
tsfeedp = secbufp = seclen = 0;
secbuf = secbuf_base;
}
int cIptvSectionFilter::demux_swfilter_sectionfilter()
{
uint8_t neq = 0;
int i;
for (i = 0; i < DMX_MAX_FILTER_SIZE; i++) {
uint8_t local_xor = filter_value[i] ^ secbuf[i];
if (maskandmode[i] & local_xor) {
#ifdef DEBUG_PRINTF
printf("maskandmode discard\n");
#endif
return 0;
}
neq |= maskandnotmode[i] & local_xor;
}
if (doneq && !neq) {
#ifdef DEBUG_PRINTF
printf("doneq discard, doneq = 0x%X, neq = 0x%X\n", doneq, !neq);
#endif
return 0;
}
return dmxdev_section_callback(secbuf, seclen, NULL, 0, DMX_OK);
}
inline int cIptvSectionFilter::demux_swfilter_section_feed()
{
if (demux_swfilter_sectionfilter() < 0)
return -1;
seclen = 0;
return 0;
}
int cIptvSectionFilter::demux_swfilter_section_copy_dump(const uint8_t *buf, uint8_t len)
{
uint16_t limit, seclen_local, n;
if (tsfeedp >= DMX_MAX_SECFEED_SIZE)
return 0;
if (tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
#ifdef DEMUX_SECTION_LOSS_LOG
printf("sectionfilter.c section buffer full loss: %d/%d\n",
tsfeedp + len - DMX_MAX_SECFEED_SIZE,
DMX_MAX_SECFEED_SIZE);
#endif
len = DMX_MAX_SECFEED_SIZE - tsfeedp;
}
if (len <= 0)
return 0;
memcpy(secbuf_base + tsfeedp, buf, len);
tsfeedp += len;
/*
* Dump all the sections we can find in the data (Emard)
*/
limit = tsfeedp;
if (limit > DMX_MAX_SECFEED_SIZE)
return -1; /* internal error should never happen */
/* to be sure always set secbuf */
secbuf = secbuf_base + secbufp;
for (n = 0; secbufp + 2 < limit; n++) {
seclen_local = section_length(secbuf);
if (seclen_local <= 0 || seclen_local > DMX_MAX_SECTION_SIZE ||
seclen_local + secbufp > limit)
return 0;
#ifdef DEBUG_PRINTF
printf("Non-mismatching seclen! %d, limit = %d\n", seclen_local, limit);
#endif
seclen = seclen_local;
/* dump [secbuf .. secbuf+seclen) */
if (pusi_seen)
demux_swfilter_section_feed();
#ifdef DEMUX_SECTION_LOSS_LOG
else
printf("sectionfilter.c pusi not seen, discarding section data\n");
#endif
secbufp += seclen_local; /* secbufp and secbuf moving together is */
secbuf += seclen_local; /* redundant but saves pointer arithmetic */
}
return 0;
}
void cIptvSectionFilter::ProcessData(const uint8_t* buf)
{
if (buf[0] != 0x47) {
error("Not TS packet: 0x%X\n", buf[0]);
return;
}
// Stop if not the PID this filter is looking for
if (ts_pid(buf) != pid)
return;
uint8_t count = payload(buf);
if (count == 0) /* count == 0 if no payload or out of range */
return;
uint8_t p = 188 - count; /* payload start */
uint8_t cc = buf[3] & 0x0f;
int ccok = ((feedcc + 1) & 0x0f) == cc;
feedcc = cc;
int dc_i = 0;
if (buf[3] & 0x20) {
/* adaption field present, check for discontinuity_indicator */
if ((buf[4] > 0) && (buf[5] & 0x80))
dc_i = 1;
}
if (!ccok || dc_i) {
#ifdef DEMUX_SECTION_LOSS_LOG
printf("sectionfilter.c discontinuity detected %d bytes lost\n",
count);
/*
* those bytes under sume circumstances will again be reported
* in the following demux_swfilter_section_new
*/
#endif
/*
* Discontinuity detected. Reset pusi_seen = 0 to
* stop feeding of suspicious data until next PUSI=1 arrives
*/
pusi_seen = 0;
demux_swfilter_section_new();
}
if (buf[1] & 0x40) {
/* PUSI=1 (is set), section boundary is here */
if (count > 1 && buf[p] < count) {
#ifdef DEBUG_PRINTF
printf("Valid section\n");
#endif
const uint8_t *before = &buf[p + 1];
uint8_t before_len = buf[p];
const uint8_t *after = &before[before_len];
uint8_t after_len = count - 1 - before_len;
demux_swfilter_section_copy_dump(before, before_len);
/* before start of new section, set pusi_seen = 1 */
pusi_seen = 1;
demux_swfilter_section_new();
demux_swfilter_section_copy_dump(after, after_len);
}
#ifdef DEMUX_SECTION_LOSS_LOG
else if (count > 0)
printf("sectionfilter.c PUSI=1 but %d bytes lost\n", count);
#endif
}
else {
/* PUSI=0 (is not set), no section boundary */
demux_swfilter_section_copy_dump(&buf[p], count);
}
}
Reference in New Issue View Git Blame Copy Permalink