/*----------------------------------------------------------------------
| AP4_LinearReader::EnableTrack
+---------------------------------------------------------------------*/
AP4_Result
AP4_LinearReader::EnableTrack(AP4_UI32 track_id)
{
// check if we don't already have this
if (FindTracker(track_id)) return AP4_SUCCESS;
// find the track in the movie
AP4_Track* track = m_Movie.GetTrack(track_id);
if (track == NULL) return AP4_ERROR_NO_SUCH_ITEM;
// process this track
return ProcessTrack(track);
}
//buf = HMP image, br = HMP image size, out_size = output MIDI image size
extern "C" void* load_hmp(BYTE* buf,DWORD br,DWORD* out_size)
{
MIDIHEADER mhd = {1,0,0xC0};
BYTE * max = buf+br;
BYTE* ptr = buf;
CWriteBuf* dst=wb_create();
DWORD n1,n2;
dst->writedword(_rv('MThd'));
dst->writedword(_rv(6));
dst->write(0,sizeof(mhd));
ptr = buf+0x30;
mhd.trax = *ptr;
dst->write(hmp_track0,sizeof(hmp_track0));
while(*(WORD*)ptr != 0x2FFF && ptr < max - 4-7) ptr++;
ptr+=7;
if (ptr == max-4) { dst->freebuf(); delete dst; return 0; }
UINT n;
for(n=1;n<mhd.trax;n++)
{
dst->writedword(_rv('MTrk'));
n1 = *(DWORD*)ptr - 12;
if (ptr + n1 > max) { dst->freebuf(); delete dst; return 0; }
ptr += 8;
UINT ts_ofs=dst->get_offs();
dst->writedword(0);
if (!(n2=ProcessTrack(ptr,dst,n1)))
{ dst->freebuf(); delete dst; return 0; }
dst->writedwordoffs(_rv(n2),ts_ofs);
ptr += n1 + 4;
}
FixHeader(mhd);
dst->writeoffs(&mhd,sizeof(mhd),8);
UINT f_sz;
BYTE* r=(BYTE*)dst->finish(&f_sz);
delete dst;
if (r)
{
if (out_size) *out_size=f_sz;
return r;
}
else
{
return 0;
}
}
void Service::FormTrack()
{
cont->translate(HEADER_WDH, 0);
ProcessTrack();
}
