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M17_UDP
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fix my BE mistake, merge master

master
mach327 2020-08-31 18:02:54 -04:00
parent f229557963 8699327adb
commit 3a3940e118
2 changed files with 28 additions and 16 deletions
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2
README.md
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@ -3,5 +3,3 @@ Receives voice packets via UDP and allows to play them back using aplay.
# Usage
./m17_udp | aplay -t raw -f S16_LE -r 8000 -c 1
or maybe
./m17_udp | aplay -t raw -f S16_BE -r 8000 -c 1

42
main.c
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@ -34,7 +34,12 @@ int s, i, slen = sizeof(si_other) , rcv_len;
//stream info
uint8_t src[10];
uint8_t dst[10];
uint16_t type=0;
uint16_t type;
uint8_t nonce[14];
uint16_t crc_lich;
uint16_t fn;
uint8_t payload[16];
uint16_t crc_pld;
uint8_t* decode_callsign_base40(uint64_t encoded, uint8_t *callsign)
{
@ -116,21 +121,30 @@ int main(int argc, char *argv[])
decode_callsign_base40(tmp, dst);
type=(bits[12]<<8)|bits[13];
memcpy(nonce, &bits[14], 14);
crc_lich=bits[28]<<8|bits[29];
fn=bits[30]<<8|bits[31];
memcpy(payload, &bits[32], 16);
crc_pld=bits[48]<<8|bits[49];
//info
printf("%s\t\t%s\t\t%04X\n", src, dst, type);
size_t frame1_offset = 32, frame2_offset =frame1_offset+8;
//reconstruct speech
codec2_decode(cod, &speech_buff[0], &bits[frame1_offset]);
codec2_decode(cod, &speech_buff[160], &bits[frame2_offset]);
//send to stdout for playback
for(uint16_t i=0; i<320*2; i++)
/*printf("%s\t\t%s\t\t%04X\n", src, dst, type);*/
if(((type>>1)&0b11)==0b10) //voice only
{
//signed 16bit, little endian
if(!(i%2))//lsb
printf("%c", (uint8_t)(speech_buff[i/2]&0xFF));
else
printf("%c", (uint8_t)(speech_buff[i/2]>>8));
//reconstruct speech
codec2_decode(cod, &speech_buff[0], &payload[0]);
codec2_decode(cod, &speech_buff[160], &payload[8]);
//send to stdout for playback
for(uint16_t i=0; i<320*2; i++)
{
//signed 16bit, little endian
if(!(i%2))//lsb
printf("%c", (uint8_t)(speech_buff[i/2]&0xFF));
else
printf("%c", (uint8_t)(speech_buff[i/2]>>8));
}
}
/*fp=fopen("out.raw", "a");