static void read_head(struct mpstr *mp)
{
unsigned long head = 0;
int i;
while(mp->tail) {
head <<= 8;
head |= read_buf_byte(mp);
head &= 0xffffffff;
if(head_check(head))
break;
}
mp->header = head;
}
/*
* decode a header and write the information
* into the frame structure
*/
int decode_header(struct frame *fr,unsigned long newhead)
{
if(head_check(newhead) == FALSE)
return (0);
if( newhead & (1<<20) ) {
fr->lsf = (newhead & (1<<19)) ? 0x0 : 0x1;
fr->mpeg25 = 0;
}
else {
fr->lsf = 1;
fr->mpeg25 = 1;
}
fr->lay = 4-((newhead>>17)&3);
if(fr->mpeg25) {
fr->sampling_frequency = 6 + ((newhead>>10)&0x3);
}
/* stream mp3 to the peer */
static void mp3streamout_stream(t_mp3streamout *x)
{
int count = -1, i;
struct frame hframe;
/* header needs to be included in each packet */
for( i=0; i<x->x_mp3size; i++ )
{
// track valid data
if ( head_check( *((unsigned long*)x->x_mp3outbuf+i), 3 ) )
{
// post( "valid header emitted @ %d (byte %d)", i, i*sizeof(unsigned long) );
}
}
count = send(x->x_fd, x->x_mp3outbuf, x->x_mp3size, MSG_NOSIGNAL);
if(count < 0)
{
error("mp3streamout~: could not send encoded data to the peer (%d)", count);
lame_close( x->lgfp );
x->x_lame = -1;
#ifdef _WIN32
closesocket(x->x_fd);
#else
close(x->x_fd);
#endif
x->x_fd = -1;
outlet_float(x->x_obj.ob_outlet, 0);
}
else
{
x->x_outpackets++;
if ( x->x_outpackets%100 == 0 )
{
// post( "mp3streamout~ : emitted %d bytes (packets = %d)", count, x->x_outpackets );
}
}
if((count > 0)&&(count != x->x_mp3size))
{
error("mp3streamout~: %d bytes skipped", x->x_mp3size - count);
}
}
int prefix_check (file_t *A, file_t *B) {
if (A->size < B->size) {
kprintf ("%s is smaller than %s\n", A->filename, B->filename);
return -2;
}
if (A->size < 20 || B->size < 20) {
return -1;
}
int r = head_check (A, B);
if (r < 0) {
return r;
}
if (B->size == STORAGE_LEV_START_SIZE) {
local_id = 0;
return 0;
}
struct lev_crc32 C1, C2;
int sz = sizeof (C1);
long long off = B->size - sz;
if (vk_pread (A, &C1, sz, off) < 0) {
return -3;
}
if (vk_pread (B, &C2, sz, off) < 0) {
return -4;
}
crc32_complement = ~C1.crc32;
if (C1.type != LEV_CRC32) {
kprintf ("didn't find LEV_CRC32 record in %s at offset %lld\n", A->filename, off);
return -5;
}
if (memcmp (&C1, &C2, sz)) {
kprintf ("last lev_crc32 record don't matched.\n");
return -6;
}
vkprintf (3, "Last %d bytes are equal (%s, %s).\n", sz, A->filename, B->filename);
crc32_complement = crc32_partial (&C1, sz, crc32_complement);
return 0;
}
