/* This hook intercepts calls to ambe_unpack(), which extracts bits
from the incoming AMBE frame. The bit buffer is later re-used to
error-correct the frame, so if we peek at the buffer before
ambe_unpack() is run we will get the error-corrected bits of the
preceding packet, but if we peek after ambe_unpack() is called,
we'll get the bits of the new frame without error correction.
*/
int ambe_unpack_hook(int a1, int a2, char length, int a4){
/* Dump the previous, error-corrected AMBE frame. For some reason,
these aren't decoding properly in DSD. */
#ifdef AMBECORRECTEDPRINT
short *bits=(short*) a1;
static int i;
printf("AMBE2+ Corr: ");
for(i=0;i<49;i++){
md380_putc(NULL,bits[i]?'1':'0');
}
md380_putc(NULL,'\n');
#endif //AMBECORRECTEDPRINT
#ifdef CONFIG_AMBE
ambe_unpack(a1,a2,length,a4);
#endif //CONFIG_AMBE
/* Dump the new, uncorrected AMBE frame. Bits won't make sense
until after decoding. */
#ifdef AMBEUNCORRECTEDPRINT
printf("AMBE2+: ");
for(i=0;i<length;i++){
md380_putc(NULL,bits[i]?'1':'0');
}
md380_putc(NULL,'\n');
#endif //AMBEUNCORRECTEDPRINT
return 0;
}
void syslog_dump_dmesg()
{
int i = begin ;
while(1) {
i = wrap(i);
if( i == end ) {
break ;
}
md380_putc(0,syslog_buf[i]);
i++ ;
}
}
/* The ambe_decode_wav() function decodes AMBE2+ bits to 80 samples
(160 bytes) of 8kHz audio as signed shorts. This hook will
optionally print that data to the dmesg buffer, where it can be
extracted and recorded on the host.
*/
int ambe_decode_wav_hook(int *a1, signed int eighty, char *bitbuffer,
int a4, short a5, short a6, int a7){
/* This prints the AMBE2+ structure that is to be decoded. The
output is decodable with DSD, but it sounds horrible.
*/
#ifdef AMBEPRINT
int ambestate=OS_ENTER_CRITICAL();
short *bits=(short*) bitbuffer;
static int i;
/* I don't know why, but this output can only be decoded by DSD if
half the frames are dropped. The trick is to only decode those
when the sixth paramter is zero, ignoring all the ones where that
parameter is a one.
Strangely enough, we do not skip half the frames of the WAV
ouput below.
*/
if(!a6){
printf("AMBE2+ Corr: ");
for(i=0;i<49;i++){
md380_putc(NULL,bits[i]?'1':'0');
}
md380_putc(NULL,'\n');
}
OS_EXIT_CRITICAL(ambestate);
#endif //AMBEPRINT
int toret=0xdeadbeef;
#ifdef CONFIG_AMBE
//First we call the original function.
toret=ambe_decode_wav(a1, eighty, bitbuffer,
a4, a5, a6, a7);
#endif
/* Print the parameters
printf("ambe_decode_wav(0x%08x, %d, 0x%08x,\n"
"%d, %d, %d, 0x%08x);\n",
a1, eighty, bitbuffer,
a4, a5, a6, a7);
*/
/* This is very noisy, so we don't enable it by default. It prints
the WAV as hex pairs, which will quickly flood the buffer if it
isn't cleared in time.
*/
#ifdef AMBEWAVPRINT
//Does this really need to be in a critical section?
int wavstate=OS_ENTER_CRITICAL();
//A1 holds audio as signed LE shorts.
printf("WAV: ");
printhex(a1,160);
printf("\n");
OS_EXIT_CRITICAL(wavstate);
#endif //AMBEWAVPRINT
return toret;
}
