mirror of
https://github.com/rofafor/vdr-plugin-iptv.git
synced 2023-10-10 11:37:03 +00:00
297 lines
8.0 KiB
C
297 lines
8.0 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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* $Id: sectionfilter.c,v 1.19 2008/02/17 19:18:47 rahrenbe Exp $
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*/
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#include "sectionfilter.h"
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cIptvSectionFilter::cIptvSectionFilter(int Index, int devInd,
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u_short Pid, u_char Tid, u_char Mask)
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: pusi_seen(0),
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feedcc(0),
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doneq(0),
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secbuf(NULL),
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secbufp(0),
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seclen(0),
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tsfeedp(0),
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pid(Pid),
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id(Index),
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pipeName("")
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{
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//debug("cIptvSectionFilter::cIptvSectionFilter(%d)\n", Index);
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memset(secbuf_base, '\0', sizeof(secbuf_base));
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memset(filter_value, '\0', sizeof(filter_value));
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memset(filter_mask, '\0', sizeof(filter_mask));
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memset(filter_mode, '\0', sizeof(filter_mode));
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memset(maskandmode, '\0', sizeof(maskandmode));
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memset(maskandnotmode, '\0', sizeof(maskandnotmode));
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SetPipeName(devInd);
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filter_value[0] = Tid;
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filter_mask[0] = Mask;
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// Invert the filter
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for (int i = 0; i < DMX_MAX_FILTER_SIZE; ++i)
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filter_value[i] ^= 0xff;
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uint8_t mask, mode, local_doneq = 0;
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for (int i = 0; i < DMX_MAX_FILTER_SIZE; ++i) {
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mode = filter_mode[i];
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mask = filter_mask[i];
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maskandmode[i] = mask & mode;
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local_doneq |= maskandnotmode[i] = mask & ~mode;
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}
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doneq = local_doneq ? 1 : 0;
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struct stat sb;
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stat(pipeName, &sb);
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if (S_ISFIFO(sb.st_mode))
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unlink(pipeName);
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int err = mknod(pipeName, 0644 | S_IFIFO, 0);
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ERROR_IF_RET(err < 0, "mknod()", return);
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// Create descriptors
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fifoDescriptor = open(pipeName, O_RDWR | O_NONBLOCK);
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readDescriptor = open(pipeName, O_RDONLY | O_NONBLOCK);
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}
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cIptvSectionFilter::~cIptvSectionFilter()
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{
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//debug("cIptvSectionFilter::~cIptvSectionfilter(%d)\n", id);
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close(fifoDescriptor);
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close(readDescriptor);
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unlink(pipeName);
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fifoDescriptor = -1;
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readDescriptor = -1;
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}
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void cIptvSectionFilter::SetPipeName(int deviceIndex)
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{
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pipeName = cString::sprintf(IPTV_FILTER_FILENAME, deviceIndex, id);
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}
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int cIptvSectionFilter::GetReadDesc()
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{
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return readDescriptor;
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}
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inline uint16_t cIptvSectionFilter::section_length(const uint8_t *buf)
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{
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return 3 + ((buf[1] & 0x0f) << 8) + buf[2];
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}
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int cIptvSectionFilter::dmxdev_section_callback(const uint8_t *buffer1, size_t buffer1_len,
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const uint8_t *buffer2, size_t buffer2_len,
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enum dmx_success success)
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{
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// See if there is data in the fifo
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int retval = select_single_desc(fifoDescriptor, 0, false);
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// There is no data in the fifo, more can be written
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if (!retval) {
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#ifdef DEBUG_PRINTF
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printf("id = %d, pid %d would now write %d data to buffer\n", id, pid, buffer1_len);
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for (unsigned int i = 0; i < buffer1_len; ++i)
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printf("0x%X ", buffer1[i]);
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printf("\n");
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#endif
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retval = write(fifoDescriptor, buffer1, buffer1_len);
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ERROR_IF(retval < 0, "write()");
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// Update statistics
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AddSectionStatistic(retval, 1);
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}
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#ifdef DEBUG_PRINTF
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else if (retval)
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printf("id %d pid %d data is already present\n", id, pid);
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#endif
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return 0;
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}
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void cIptvSectionFilter::demux_swfilter_section_new()
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{
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#ifdef DEMUX_SECTION_LOSS_LOG
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if (secbufp < tsfeedp) {
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int i, n = tsfeedp - secbufp;
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/*
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* Section padding is done with 0xff bytes entirely.
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* Due to speed reasons, we won't check all of them
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* but just first and last.
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*/
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if (secbuf[0] != 0xff || secbuf[n - 1] != 0xff) {
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printf("sectionfilter.c section ts padding loss: %d/%d\n",
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n, tsfeedp);
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printf("sectionfilter.c pad data:");
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for (i = 0; i < n; ++i)
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printf(" %02x", secbuf[i]);
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printf("\n");
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}
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}
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#endif
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tsfeedp = secbufp = seclen = 0;
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secbuf = secbuf_base;
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}
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int cIptvSectionFilter::demux_swfilter_sectionfilter()
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{
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uint8_t neq = 0;
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int i;
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for (i = 0; i < DMX_MAX_FILTER_SIZE; ++i) {
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uint8_t local_xor = filter_value[i] ^ secbuf[i];
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if (maskandmode[i] & local_xor) {
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#ifdef DEBUG_PRINTF
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printf("maskandmode discard\n");
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#endif
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return 0;
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}
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neq |= maskandnotmode[i] & local_xor;
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}
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if (doneq && !neq) {
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#ifdef DEBUG_PRINTF
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printf("doneq discard, doneq = 0x%X, neq = 0x%X\n", doneq, !neq);
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#endif
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return 0;
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}
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return dmxdev_section_callback(secbuf, seclen, NULL, 0, DMX_OK);
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}
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inline int cIptvSectionFilter::demux_swfilter_section_feed()
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{
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if (demux_swfilter_sectionfilter() < 0)
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return -1;
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seclen = 0;
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return 0;
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}
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int cIptvSectionFilter::demux_swfilter_section_copy_dump(const uint8_t *buf, uint8_t len)
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{
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uint16_t limit, seclen_local, n;
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if (tsfeedp >= DMX_MAX_SECFEED_SIZE)
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return 0;
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if (tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
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#ifdef DEMUX_SECTION_LOSS_LOG
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printf("sectionfilter.c section buffer full loss: %d/%d\n",
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tsfeedp + len - DMX_MAX_SECFEED_SIZE,
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DMX_MAX_SECFEED_SIZE);
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#endif
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len = DMX_MAX_SECFEED_SIZE - tsfeedp;
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}
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if (len <= 0)
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return 0;
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memcpy(secbuf_base + tsfeedp, buf, len);
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tsfeedp += len;
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/*
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* Dump all the sections we can find in the data (Emard)
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*/
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limit = tsfeedp;
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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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/* to be sure always set secbuf */
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secbuf = secbuf_base + secbufp;
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for (n = 0; secbufp + 2 < limit; ++n) {
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seclen_local = section_length(secbuf);
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if (seclen_local <= 0 || seclen_local > DMX_MAX_SECTION_SIZE ||
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seclen_local + secbufp > limit)
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return 0;
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#ifdef DEBUG_PRINTF
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printf("Non-mismatching seclen! %d, limit = %d\n", seclen_local, limit);
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#endif
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seclen = seclen_local;
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/* dump [secbuf .. secbuf+seclen) */
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if (pusi_seen)
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demux_swfilter_section_feed();
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#ifdef DEMUX_SECTION_LOSS_LOG
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else
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printf("sectionfilter.c pusi not seen, discarding section data\n");
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#endif
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secbufp += seclen_local; /* secbufp and secbuf moving together is */
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secbuf += seclen_local; /* redundant but saves pointer arithmetic */
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}
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return 0;
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}
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void cIptvSectionFilter::ProcessData(const uint8_t* buf)
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{
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if (buf[0] != 0x47) {
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error("Not TS packet: 0x%X\n", buf[0]);
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return;
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}
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// Stop if not the PID this filter is looking for
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if (ts_pid(buf) != pid)
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return;
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uint8_t count = payload(buf);
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if (count == 0) /* count == 0 if no payload or out of range */
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return;
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uint8_t p = 188 - count; /* payload start */
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uint8_t cc = buf[3] & 0x0f;
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int ccok = ((feedcc + 1) & 0x0f) == cc;
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feedcc = cc;
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int dc_i = 0;
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if (buf[3] & 0x20) {
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/* adaption field present, check for discontinuity_indicator */
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if ((buf[4] > 0) && (buf[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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#ifdef DEMUX_SECTION_LOSS_LOG
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printf("sectionfilter.c discontinuity detected %d bytes lost\n",
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count);
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/*
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* those bytes under sume circumstances will again be reported
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* in the following demux_swfilter_section_new
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*/
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#endif
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/*
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* Discontinuity detected. Reset pusi_seen = 0 to
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* stop feeding of suspicious data until next PUSI=1 arrives
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*/
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pusi_seen = 0;
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demux_swfilter_section_new();
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}
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if (buf[1] & 0x40) {
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/* PUSI=1 (is set), section boundary is here */
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if (count > 1 && buf[p] < count) {
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#ifdef DEBUG_PRINTF
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printf("Valid section\n");
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#endif
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const uint8_t *before = &buf[p + 1];
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uint8_t before_len = buf[p];
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const uint8_t *after = &before[before_len];
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uint8_t after_len = (count - 1) - before_len;
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demux_swfilter_section_copy_dump(before, before_len);
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/* before start of new section, set pusi_seen = 1 */
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pusi_seen = 1;
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demux_swfilter_section_new();
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demux_swfilter_section_copy_dump(after, after_len);
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}
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#ifdef DEMUX_SECTION_LOSS_LOG
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else if (count > 0)
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printf("sectionfilter.c PUSI=1 but %d bytes lost\n", count);
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#endif
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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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demux_swfilter_section_copy_dump(&buf[p], count);
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}
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}
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