ssize_t eRawFile::read(off_t offset, void *buf, size_t count)
{
eSingleLocker l(m_lock);
if (offset != m_current_offset)
{
m_current_offset = lseek_internal(offset);
if (m_current_offset < 0)
return m_current_offset;
}
switchOffset(m_current_offset);
if (m_nrfiles >= 2)
{
if (m_current_offset + count > m_totallength)
count = m_totallength - m_current_offset;
if (count < 0)
return 0;
}
int ret;
ret = ::read(m_fd, buf, count);
if (ret > 0)
{
m_current_offset = m_last_offset += ret;
}
return ret;
}
eM2TSFile::eM2TSFile(const char *filename):
m_lock(false),
m_sync_offset(0),
m_fd(::open(filename, O_RDONLY | O_LARGEFILE)),
m_current_offset(0),
m_length(0)
{
if (m_fd != -1)
m_current_offset = m_length = lseek_internal(0, SEEK_END);
}
eM2TSFile::eM2TSFile(const char *filename, bool cached)
:m_lock(false), m_sync_offset(0), m_fd(-1), m_file(NULL), m_current_offset(0), m_length(0), m_cached(cached)
{
if (!m_cached)
m_fd = ::open(filename, O_RDONLY | O_LARGEFILE);
else
m_file = ::fopen64(filename, "rb");
if (valid())
m_current_offset = m_length = lseek_internal(0, SEEK_END);
}
off_t eM2TSFile::lseek(off_t offset, int whence)
{
eSingleLocker l(m_lock);
offset = (offset % 188) + (offset * 192) / 188;
if (offset != m_current_offset)
m_current_offset = lseek_internal(offset, whence);
return m_current_offset;
}
/* move the read/write file offset */
off_t lseek(int fildes, off_t offset, int whence)
{
DEBUGF("lseek(fd=%d,ofs=%ld,wh=%d)\n", fildes, (long)offset, whence);
struct filestr_desc * const file = GET_FILESTR(READER, fildes);
if (!file)
FILE_ERROR_RETURN(ERRNO, -1);
off_t rc = lseek_internal(file, offset, whence);
if (rc < 0)
FILE_ERROR(ERRNO, rc * 10 - 2);
file_error:
RELEASE_FILESTR(READER, file);
return rc;
}
ssize_t eM2TSFile::read(off_t offset, void *b, size_t count)
{
eSingleLocker l(m_lock);
unsigned char tmp[192*3];
unsigned char *buf = (unsigned char*)b;
size_t rd=0;
offset = (offset % 188) + (offset * 192) / 188;
sync:
if ((offset+m_sync_offset) != m_current_offset)
{
// eDebug("seekTo %lld", offset+m_sync_offset);
m_current_offset = lseek_internal(offset+m_sync_offset, SEEK_SET);
if (m_current_offset < 0)
return m_current_offset;
}
while (rd < count) {
size_t ret;
ret = ::read(m_fd, tmp, 192);
if (ret < 0 || ret < 192)
return rd ? rd : ret;
if (tmp[4] != 0x47)
{
if (rd > 0) {
eDebug("short read at pos %lld async!!", m_current_offset);
return rd;
}
else {
int x=0;
ret = ::read(m_fd, tmp+192, 384);
#if 0
eDebugNoNewLine("m2ts out of sync at pos %lld, real %lld:", offset + m_sync_offset, m_current_offset);
for (; x < 192; ++x)
eDebugNoNewLine(" %02x", tmp[x]);
eDebug("");
x=0;
#else
eDebug("m2ts out of sync at pos %lld, real %lld", offset + m_sync_offset, m_current_offset);
#endif
for (; x < 192; ++x)
{
if (tmp[x] == 0x47 && tmp[x+192] == 0x47)
{
int add_offs = (x - 4);
eDebug("sync found at pos %d, sync_offset is now %d, old was %d", x, add_offs + m_sync_offset, m_sync_offset);
m_sync_offset += add_offs;
goto sync;
}
}
}
}
memcpy(buf+rd, tmp+4, 188);
rd += 188;
m_current_offset += 188;
}
m_sync_offset %= 188;
return rd;
}
loff_t lseek(loff_t offset, uint32_t origin) {
return lseek_internal(offset, origin);
}