/**
* callback_c(cookie, buf, buflen):
* Handle a chunk ${buf} of length ${buflen} from the chunk index stream of
* the tape associated with the multitape write cookie ${cookie}.
*/
static int
callback_c(void * cookie, uint8_t * buf, size_t buflen)
{
struct multitape_write_internal * d = cookie;
return (handle_chunk(buf, buflen, &d->c, d->C));
}
int gavf_open_read(gavf_t * g, gavf_io_t * io)
{
char sig[8];
g->io = io;
g->opt.flags &= ~(GAVF_OPT_FLAG_SYNC_INDEX|
GAVF_OPT_FLAG_PACKET_INDEX);
/* Initialize packet buffer */
gavf_io_init_buf_read(&g->pkt_io, &g->pkt_buf);
gavf_io_init_buf_read(&g->meta_io, &g->meta_buf);
/* Read up to the first sync header */
while(1)
{
if(gavf_io_read_data(g->io, (uint8_t*)sig, 8) < 8)
return 0;
if(!handle_chunk(g, sig))
return 0;
if(g->first_sync_pos > 0)
break;
}
gavf_footer_check(g);
/* Dump stuff */
if(g->opt.flags & GAVF_OPT_FLAG_DUMP_HEADERS)
{
gavf_program_header_dump(&g->ph);
if(g->cl)
gavl_chapter_list_dump(g->cl);
}
if(g->opt.flags & GAVF_OPT_FLAG_DUMP_INDICES)
{
if((g->opt.flags & GAVF_OPT_FLAG_DUMP_INDICES) ||
(g->opt.flags & GAVF_OPT_FLAG_SYNC_INDEX))
gavf_sync_index_dump(&g->si);
if((g->opt.flags & GAVF_OPT_FLAG_DUMP_INDICES) ||
(g->opt.flags & GAVF_OPT_FLAG_PACKET_INDEX))
gavf_packet_index_dump(&g->pi);
}
gavf_reset(g);
if(!(g->opt.flags & GAVF_OPT_FLAG_ORIG_PTS))
calc_pts_offset(g);
return 1;
}
void descramble(uint8 *source, uint8 *dest, uint32 size) {
load(source, 0);
my_srand(size);
/* Descramble 2 meg blocks for as long as possible, then
gradually reduce the window down to 32 bytes (1 slice) */
for(uint32 chunksz = MAXCHUNK; chunksz >= 32; chunksz >>= 1)
{
while(size >= chunksz)
{
handle_chunk(dest, chunksz);
size -= chunksz;
dest += chunksz;
}
}
/* !!! Load final incomplete slice */
if(size)
load(dest, size);
}
