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#include <lib/dvb/tstools.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
eDVBTSTools::eDVBTSTools()
{
m_fd = -1;
m_pid = -1;
m_maxrange = 1*1024*1024;
m_begin_valid = 0;
m_end_valid = 0;
}
eDVBTSTools::~eDVBTSTools()
{
closeFile();
}
int eDVBTSTools::openFile(const char *filename)
{
closeFile();
m_fd = ::open(filename, O_RDONLY);
if (m_fd < 0)
return -1;
return 0;
}
void eDVBTSTools::closeFile()
{
if (m_fd >= 0)
::close(m_fd);
}
void eDVBTSTools::setSyncPID(int pid)
{
m_pid = pid;
}
void eDVBTSTools::setSearchRange(int maxrange)
{
m_maxrange = maxrange;
}
int eDVBTSTools::getPTS(off_t &offset, pts_t &pts)
{
if (m_fd < 0)
return -1;
if (m_pid < 0)
return -1;
offset -= offset % 188;
// TODO: multiple files!
if (lseek(m_fd, offset, SEEK_SET) < 0)
return -1;
int left = m_maxrange;
while (left >= 188)
{
unsigned char block[188];
if (read(m_fd, block, 188) != 188)
break;
left -= 188;
offset += 188;
if (block[0] != 0x47)
{
int i = 0;
while (i < 188)
if (block[i] == 0x47)
break;
offset = lseek(m_fd, i - 188, SEEK_CUR);
continue;
}
int pid = ((block[1] << 8) | block[2]) & 0x1FFF;
int pusi = !!(block[1] & 0x40);
// printf("PID %04x, PUSI %d\n", pid, pusi);
if (pid != m_pid)
continue;
if (!pusi)
continue;
/* ok, now we have a PES header */
unsigned char *pes;
/* check for adaption field */
if (block[3] & 0x10)
pes = block + block[4] + 4 + 1;
else
pes = block + 4;
/* somehow not a startcode. (this is invalid, since pusi was set.) ignore it. */
if (pes[0] || pes[1] || (pes[2] != 1))
continue;
if (pes[7] & 0x80) /* PTS */
{
pts = ((unsigned long long)(pes[ 9]&0xE)) << 29;
pts |= ((unsigned long long)(pes[10]&0xFF)) << 22;
pts |= ((unsigned long long)(pes[11]&0xFE)) << 14;
pts |= ((unsigned long long)(pes[12]&0xFF)) << 7;
pts |= ((unsigned long long)(pes[13]&0xFE)) >> 1;
offset -= 188;
return 0;
}
}
return -1;
}
void eDVBTSTools::calcBegin()
{
if (m_fd < 0)
return;
if (!m_begin_valid)
{
m_offset_begin = 0;
if (!getPTS(m_offset_begin, m_pts_begin))
m_begin_valid = 1;
}
}
void eDVBTSTools::calcEnd()
{
if (m_fd < 0)
return;
if (!m_end_valid)
{
m_offset_end = lseek(m_fd, 0, SEEK_END) - m_maxrange;
if (!getPTS(m_offset_end, m_pts_end))
m_end_valid = 1;
}
}
int eDVBTSTools::calcLen(pts_t &len)
{
calcBegin(); calcEnd();
if (!(m_begin_valid && m_end_valid))
return -1;
len = m_pts_end - m_pts_begin;
return 0;
}
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