int eMPEGStreamInformation::getStructureEntryFirst(off_t &offset, unsigned long long &data)
{
//eDebug("[eMPEGStreamInformation] {%d} getStructureEntryFirst(offset=%llu)", gettid(), offset);
if (m_structure_read_fd < 0)
{
eDebug("[eMPEGStreamInformation] getStructureEntryFirst failed because of no m_structure_read_fd");
return -1;
}
if ((m_structure_cache_entries == 0) ||
(structureCacheOffset(0) > offset) ||
(structureCacheOffset(m_structure_cache_entries - 1) <= offset))
{
int l = ::lseek(m_structure_read_fd, 0, SEEK_END) / entry_size;
if (l == 0)
{
eDebug("[eMPEGStreamInformation] getStructureEntryFirst failed because file size is zero");
return -1;
}
m_structure_file_entries = l;
/* do a binary search */
int count = l;
int i = 0;
const int structure_cache_size = MAPSIZE / entry_size;
while (count > (structure_cache_size/4))
{
int step = count >> 1;
::lseek(m_structure_read_fd, (i + step) * entry_size, SEEK_SET);
unsigned long long d;
if (::read(m_structure_read_fd, &d, sizeof(d)) < (ssize_t)sizeof(d))
{
eDebug("[eMPEGStreamInformation] getStructureEntryFirst read error at entry %d", i+step);
return -1;
}
d = be64toh(d);
if (d < (unsigned long long)offset)
{
i += step + 1;
count -= step + 1;
} else
count = step;
}
//eDebug("[eMPEGStreamInformation] getStructureEntryFirst i=%d size=%d count=%d", i, l, count);
if (i + structure_cache_size > l)
{
i = l - structure_cache_size; // Near end of file, just fetch the last
}
if (i < 0)
i = 0;
int num = moveCache(i);
if ((num < structure_cache_size) && (structureCacheOffset(num - 1) <= offset))
{
eDebug("[eMPEGStreamInformation] offset %jd is past EOF of structure file", (intmax_t)offset);
data = 0;
return 1;
}
}
int eMPEGStreamInformation::getStructureEntryFirst(off_t &offset, unsigned long long &data)
{
//eDebug("[eMPEGStreamInformation] {%d} getStructureEntryFirst(offset=%lld)", gettid(), offset);
if (m_structure_read_fd < 0)
{
eDebug("[eMPEGStreamInformation] getStructureEntryFirst failed because of no m_structure_read_fd");
return -1;
}
if ((m_structure_cache_entries == 0) ||
(structureCacheOffset(0) > offset) ||
(structureCacheOffset(m_structure_cache_entries - 1) <= offset))
{
int l = ::lseek(m_structure_read_fd, 0, SEEK_END) / entry_size;
if (l == 0)
{
eDebug("[eMPEGStreamInformation] getStructureEntryFirst failed because file size is zero");
return -1;
}
m_structure_file_entries = l;
/* do a binary search */
int count = l;
int i = 0;
const int structure_cache_size = MAPSIZE / entry_size;
while (count > (structure_cache_size/4))
{
int step = count >> 1;
// Read entry at top end of current range (== i+step-1)
::lseek(m_structure_read_fd, (i + step - 1) * entry_size, SEEK_SET);
unsigned long long d;
if (::read(m_structure_read_fd, &d, sizeof(d)) < (ssize_t)sizeof(d))
{
eDebug("[eMPEGStreamInformation] getStructureEntryFirst read error at entry %d", i+step);
return -1;
}
d = be64toh(d);
if (d < (unsigned long long)offset)
{
// Move start of range to *be* the last test (+1 more may be too high!!)
// and remove tested count
i += step;
count -= step;
} else
// Keep start of range but change range to that below test
count = step;
}
//eDebug("[eMPEGStreamInformation] getStructureEntryFirst i=%d size=%d count=%d", i, l, count);
if (i + structure_cache_size > l)
{
i = l - structure_cache_size; // Near end of file, just fetch the last
}
if (i < 0)
i = 0;
int num = moveCache(i);
if ((num < structure_cache_size) && (structureCacheOffset(num - 1) <= offset))
{
eDebug("[eMPEGStreamInformation] offset %lld is past EOF of structure file", offset);
data = 0;
return 1;
}
}
