mirror of
https://github.com/rofafor/vdr-plugin-iptv.git
synced 2023-10-10 11:37:03 +00:00
387 lines
11 KiB
C
387 lines
11 KiB
C
/*
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* sectionfilter.c: IPTV plugin for the Video Disk Recorder
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*
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* See the README file for copyright information and how to reach the author.
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*
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*/
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#include "config.h"
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#include "sectionfilter.h"
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cIptvSectionFilter::cIptvSectionFilter(int deviceIndexP, uint16_t pidP, uint8_t tidP, uint8_t maskP)
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: pusiSeenM(0),
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feedCcM(0),
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doneqM(0),
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secBufM(NULL),
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secBufpM(0),
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secLenM(0),
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tsFeedpM(0),
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pidM(pidP),
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deviceIndexM(deviceIndexP)
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{
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//debug("cIptvSectionFilter::%s(%d, %d)", __FUNCTION__, deviceIndexM, pidM);
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int i;
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memset(secBufBaseM, 0, sizeof(secBufBaseM));
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memset(filterValueM, 0, sizeof(filterValueM));
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memset(filterMaskM, 0, sizeof(filterMaskM));
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memset(filterModeM, 0, sizeof(filterModeM));
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memset(maskAndModeM, 0, sizeof(maskAndModeM));
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memset(maskAndNotModeM, 0, sizeof(maskAndNotModeM));
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filterValueM[0] = tidP;
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filterMaskM[0] = maskP;
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// Invert the filter
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for (i = 0; i < DMX_MAX_FILTER_SIZE; ++i)
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filterValueM[i] ^= 0xFF;
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uint8_t mask, mode, doneq = 0;
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for (i = 0; i < DMX_MAX_FILTER_SIZE; ++i) {
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mode = filterModeM[i];
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mask = filterMaskM[i];
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maskAndModeM[i] = (uint8_t)(mask & mode);
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maskAndNotModeM[i] = (uint8_t)(mask & ~mode);
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doneq |= maskAndNotModeM[i];
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}
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doneqM = doneq ? 1 : 0;
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// Create sockets
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socketM[0] = socketM[1] = -1;
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if (socketpair(AF_UNIX, SOCK_DGRAM, 0, socketM) != 0) {
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char tmp[64];
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error("Opening section filter sockets failed (device=%d pid=%d): %s", deviceIndexM, pidM, strerror_r(errno, tmp, sizeof(tmp)));
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}
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else if ((fcntl(socketM[0], F_SETFL, O_NONBLOCK) != 0) || (fcntl(socketM[1], F_SETFL, O_NONBLOCK) != 0)) {
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char tmp[64];
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error("Setting section filter socket to non-blocking mode failed (device=%d pid=%d): %s", deviceIndexM, pidM, strerror_r(errno, tmp, sizeof(tmp)));
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}
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}
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cIptvSectionFilter::~cIptvSectionFilter()
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{
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//debug("cIptvSectionFilter::%s(%d, %d)", __FUNCTION__, deviceIndexM, pidM);
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int tmp = socketM[1];
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socketM[1] = -1;
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if (tmp >= 0)
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close(tmp);
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tmp = socketM[0];
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socketM[0] = -1;
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if (tmp >= 0)
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close(tmp);
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secBufM = NULL;
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}
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inline uint16_t cIptvSectionFilter::GetLength(const uint8_t *dataP)
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{
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return (uint16_t)(3 + ((dataP[1] & 0x0f) << 8) + dataP[2]);
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}
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void cIptvSectionFilter::New(void)
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{
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tsFeedpM = secBufpM = secLenM = 0;
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secBufM = secBufBaseM;
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}
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int cIptvSectionFilter::Filter(void)
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{
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if (secBufM) {
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int i;
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uint8_t neq = 0;
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for (i = 0; i < DMX_MAX_FILTER_SIZE; ++i) {
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uint8_t calcxor = (uint8_t)(filterValueM[i] ^ secBufM[i]);
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if (maskAndModeM[i] & calcxor)
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return 0;
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neq |= (maskAndNotModeM[i] & calcxor);
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}
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if (doneqM && !neq)
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return 0;
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// There is no data in the read socket, more can be written
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if ((socketM[0] >= 0) && (socketM[1] >= 0) /*&& !select_single_desc(socketM[0], 0, false)*/) {
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ssize_t len = write(socketM[1], secBufM, secLenM);
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ERROR_IF(len < 0, "write()");
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// Update statistics
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AddSectionStatistic(len, 1);
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}
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}
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return 0;
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}
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inline int cIptvSectionFilter::Feed(void)
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{
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if (Filter() < 0)
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return -1;
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secLenM = 0;
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return 0;
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}
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int cIptvSectionFilter::CopyDump(const uint8_t *bufP, uint8_t lenP)
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{
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uint16_t limit, seclen, n;
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if (tsFeedpM >= DMX_MAX_SECFEED_SIZE)
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return 0;
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if (tsFeedpM + lenP > DMX_MAX_SECFEED_SIZE)
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lenP = (uint8_t)(DMX_MAX_SECFEED_SIZE - tsFeedpM);
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if (lenP <= 0)
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return 0;
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memcpy(secBufBaseM + tsFeedpM, bufP, lenP);
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tsFeedpM = uint16_t(tsFeedpM + lenP);
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limit = tsFeedpM;
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if (limit > DMX_MAX_SECFEED_SIZE)
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return -1; // internal error should never happen
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// Always set secbuf
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secBufM = secBufBaseM + secBufpM;
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for (n = 0; secBufpM + 2 < limit; ++n) {
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seclen = GetLength(secBufM);
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if ((seclen <= 0) || (seclen > DMX_MAX_SECTION_SIZE) || ((seclen + secBufpM) > limit))
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return 0;
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secLenM = seclen;
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if (pusiSeenM)
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Feed();
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secBufpM = uint16_t(secBufpM + seclen);
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secBufM += seclen;
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}
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return 0;
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}
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void cIptvSectionFilter::Process(const uint8_t* dataP)
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{
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if (dataP[0] != TS_SYNC_BYTE)
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return;
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// Stop if not the PID this filter is looking for
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if (ts_pid(dataP) != pidM)
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return;
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uint8_t count = payload(dataP);
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// Check if no payload or out of range
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if (count == 0)
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return;
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// Payload start
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uint8_t p = (uint8_t)(TS_SIZE - count);
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uint8_t cc = (uint8_t)(dataP[3] & 0x0f);
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int ccok = ((feedCcM + 1) & 0x0f) == cc;
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feedCcM = cc;
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int dc_i = 0;
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if (dataP[3] & 0x20) {
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// Adaption field present, check for discontinuity_indicator
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if ((dataP[4] > 0) && (dataP[5] & 0x80))
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dc_i = 1;
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}
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if (!ccok || dc_i) {
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// Discontinuity detected. Reset pusiSeenM = 0 to
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// stop feeding of suspicious data until next PUSI=1 arrives
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pusiSeenM = 0;
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New();
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}
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if (dataP[1] & 0x40) {
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// PUSI=1 (is set), section boundary is here
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if (count > 1 && dataP[p] < count) {
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const uint8_t *before = &dataP[p + 1];
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uint8_t before_len = dataP[p];
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const uint8_t *after = &before[before_len];
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uint8_t after_len = (uint8_t)(count - 1 - before_len);
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CopyDump(before, before_len);
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// Before start of new section, set pusiSeenM = 1
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pusiSeenM = 1;
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New();
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CopyDump(after, after_len);
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}
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}
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else {
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// PUSI=0 (is not set), no section boundary
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CopyDump(&dataP[p], count);
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}
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}
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cIptvSectionFilterHandler::cIptvSectionFilterHandler(int deviceIndexP, unsigned int bufferLenP)
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: cThread("IPTV section handler", true),
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mutexM(),
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deviceIndexM(deviceIndexP),
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processedM(false),
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ringBufferM(new cRingBufferLinear(bufferLenP, TS_SIZE, false, *cString::sprintf("IPTV SECTION HANDLER %d", deviceIndexP)))
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{
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debug("cIptvSectionFilterHandler::%s(%d)", __FUNCTION__, deviceIndexM);
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// Initialize filter pointers
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memset(filtersM, 0, sizeof(filtersM));
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// Create input buffer
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if (ringBufferM) {
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ringBufferM->SetTimeouts(100, 100);
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ringBufferM->SetIoThrottle();
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}
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else
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error("Failed to allocate buffer for section filter handler (device=%d): ", deviceIndexM);
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Start();
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}
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cIptvSectionFilterHandler::~cIptvSectionFilterHandler()
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{
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debug("cIptvSectionFilterHandler::%s(%d)", __FUNCTION__, deviceIndexM);
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// Stop thread
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if (Running())
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Cancel(3);
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DELETE_POINTER(ringBufferM);
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// Destroy all filters
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cMutexLock MutexLock(&mutexM);
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for (int i = 0; i < eMaxSecFilterCount; ++i)
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Delete(i);
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}
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void cIptvSectionFilterHandler::Action(void)
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{
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debug("cIptvSectionFilterHandler::%s(%d): entering", __FUNCTION__, deviceIndexM);
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// Do the thread loop
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while (Running()) {
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// Read one TS packet
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if (ringBufferM) {
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int len = 0;
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if (processedM) {
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ringBufferM->Del(TS_SIZE);
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processedM = false;
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}
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uchar *p = ringBufferM->Get(len);
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if (p && (len >= TS_SIZE)) {
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if (*p != TS_SYNC_BYTE) {
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for (int i = 1; i < len; ++i) {
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if (p[i] == TS_SYNC_BYTE) {
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len = i;
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break;
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}
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}
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ringBufferM->Del(len);
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debug("cIptvSectionFilterHandler::%s(%d): Skipped %d bytes to sync on TS packet", __FUNCTION__, deviceIndexM, len);
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continue;
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}
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// Process TS packet through all filters
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mutexM.Lock();
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for (unsigned int i = 0; i < eMaxSecFilterCount; ++i) {
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if (filtersM[i])
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filtersM[i]->Process(p);
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}
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mutexM.Unlock();
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processedM = true;
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continue;
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}
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}
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cCondWait::SleepMs(10); // to avoid busy loop and reduce cpu load
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}
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debug("cIptvSectionFilterHandler::%s(%d): exiting", __FUNCTION__, deviceIndexM);
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}
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cString cIptvSectionFilterHandler::GetInformation(void)
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{
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//debug("cIptvSectionFilterHandler::%s(%d)", __FUNCTION__, deviceIndexM);
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// loop through active section filters
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cMutexLock MutexLock(&mutexM);
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cString s = "";
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unsigned int count = 0;
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for (unsigned int i = 0; i < eMaxSecFilterCount; ++i) {
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if (filtersM[i]) {
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s = cString::sprintf("%sFilter %d: %s Pid=0x%02X (%s)\n", *s, i,
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*filtersM[i]->GetSectionStatistic(), filtersM[i]->GetPid(),
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id_pid(filtersM[i]->GetPid()));
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if (++count > IPTV_STATS_ACTIVE_FILTERS_COUNT)
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break;
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}
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}
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return s;
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}
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bool cIptvSectionFilterHandler::Delete(unsigned int indexP)
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{
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//debug("cIptvSectionFilterHandler::%s(%d): index=%d", __FUNCTION__, deviceIndexM, indexP);
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if ((indexP < eMaxSecFilterCount) && filtersM[indexP]) {
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//debug("cIptvSectionFilterHandler::%s(%d): found %d", __FUNCTION__, deviceIndexM, indexP);
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cIptvSectionFilter *tmp = filtersM[indexP];
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filtersM[indexP] = NULL;
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delete tmp;
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return true;
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}
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return false;
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}
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bool cIptvSectionFilterHandler::IsBlackListed(u_short pidP, u_char tidP, u_char maskP) const
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{
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//debug("cIptvSectionFilterHandler::%s(%d): pid=%d tid=%02X mask=%02X", __FUNCTION__, deviceIndexM, pidP, tidP, maskP);
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// loop through section filter table
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for (int i = 0; i < SECTION_FILTER_TABLE_SIZE; ++i) {
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int index = IptvConfig.GetDisabledFilters(i);
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// Check if matches
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if ((index >= 0) && (index < SECTION_FILTER_TABLE_SIZE) &&
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(section_filter_table[index].pid == pidP) && (section_filter_table[index].tid == tidP) &&
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(section_filter_table[index].mask == maskP)) {
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//debug("cIptvSectionFilterHandler::%s(%d): found %s", __FUNCTION__, deviceIndexM, section_filter_table[index].description);
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return true;
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}
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}
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return false;
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}
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int cIptvSectionFilterHandler::Open(u_short pidP, u_char tidP, u_char maskP)
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{
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// Lock
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cMutexLock MutexLock(&mutexM);
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// Blacklist check, refuse certain filters
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if (IsBlackListed(pidP, tidP, maskP))
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return -1;
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// Search the next free filter slot
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for (unsigned int i = 0; i < eMaxSecFilterCount; ++i) {
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if (!filtersM[i]) {
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filtersM[i] = new cIptvSectionFilter(deviceIndexM, pidP, tidP, maskP);
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debug("cIptvSectionFilterHandler::%s(%d): pid=%d tid=%02X mask=%02X handle=%d index=%d", __FUNCTION__, deviceIndexM, pidP, tidP, maskP, filtersM[i]->GetFd(), i);
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return filtersM[i]->GetFd();
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}
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}
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// No free filter slot found
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return -1;
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}
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void cIptvSectionFilterHandler::Close(int handleP)
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{
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// Lock
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cMutexLock MutexLock(&mutexM);
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// Search the filter for deletion
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for (unsigned int i = 0; i < eMaxSecFilterCount; ++i) {
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if (filtersM[i] && (handleP == filtersM[i]->GetFd())) {
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debug("cIptvSectionFilterHandler::%s(%d): pid=%d handle=%d index=%d", __FUNCTION__, deviceIndexM, filtersM[i]->GetPid(), filtersM[i]->GetFd(), i);
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Delete(i);
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break;
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}
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}
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}
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void cIptvSectionFilterHandler::Write(uchar *bufferP, int lengthP)
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{
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//debug("cIptvSectionFilterHandler::%s(%d): length=%d", __FUNCTION__, deviceIndexM, lengthP);
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// Fill up the buffer
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if (ringBufferM) {
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int len = ringBufferM->Put(bufferP, lengthP);
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if (len != lengthP)
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ringBufferM->ReportOverflow(lengthP - len);
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}
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}
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