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Add an EOI (End of Image / Last Packet) flag to the encoder. 

Trim callsign correctly if longer than 6 characters.
Add a verbose mode for the decoder.
This commit is contained in:
Philip Heron 2015-10-20 00:15:15 +01:00
parent 84ccbf972d
commit 0c847e515d
3 changed files with 53 additions and 22 deletions
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28
main.c
View File

@ -47,6 +47,8 @@ int main(int argc, char *argv[])
char encode = -1;
char type = SSDV_TYPE_NORMAL;
int droptest = 0;
int verbose = 0;
int errors;
char callsign[7];
uint8_t image_id = 0;
ssdv_t ssdv;
@ -57,7 +59,7 @@ int main(int argc, char *argv[])
callsign[0] = '\0';
opterr = 0;
while((c = getopt(argc, argv, "ednc:i:t:")) != -1)
while((c = getopt(argc, argv, "ednc:i:t:v")) != -1)
{
switch(c)
{
@ -71,6 +73,7 @@ int main(int argc, char *argv[])
break;
case 'i': image_id = atoi(optarg); break;
case 't': droptest = atoi(optarg); break;
case 'v': verbose = 1; break;
case '?': exit_usage();
}
}
@ -124,7 +127,28 @@ int main(int argc, char *argv[])
if(droptest && (rand() / (RAND_MAX / 100) < droptest)) continue;
/* Test the packet is valid */
if(ssdv_dec_is_packet(pkt, NULL, type) != 0) continue;
if(ssdv_dec_is_packet(pkt, &errors, type) != 0) continue;
if(verbose)
{
ssdv_packet_info_t p;
ssdv_dec_header(&p, pkt);
fprintf(stderr, "Decoded image packet. Callsign: %s, Image ID: %d, Resolution: %dx%d, Packet ID: %d (%d errors corrected)\n"
">> EOI: %d, MCU Mode: %d, MCU Offset: %d, MCU ID: %d/%d\n",
p.callsign_s,
p.image_id,
p.width,
p.height,
p.packet_id,
errors,
p.eoi,
p.mcu_mode,
p.mcu_offset,
p.mcu_id,
p.mcu_count
);
}
/* Feed it to the decoder */
ssdv_dec_feed(&ssdv, pkt);

12
ssdv.c
View File

@ -177,8 +177,8 @@ static uint32_t encode_callsign(char *callsign)
uint32_t x;
char *c;
/* Point c at the end of the callsign */
for(c = callsign; *c; c++);
/* Point c at the end of the callsign, maximum of 6 characters */
for(x = 0, c = callsign; x < SSDV_MAX_CALLSIGN && *c; x++, c++);
/* Encode it backwards */
x = 0;
@ -971,7 +971,9 @@ char ssdv_enc_get_packet(ssdv_t *s)
s->out[8] = s->packet_id & 0xFF; /* Packet ID LSB */
s->out[9] = s->width >> 4; /* Width / 16 */
s->out[10] = s->height >> 4; /* Height / 16 */
s->out[11] = s->mcu_mode & 0x03; /* MCU mode (2 bits) */
s->out[11] = 0x00;
s->out[11] |= (r == SSDV_EOI ? 1 : 0) << 2; /* EOI flag (1 bit) */
s->out[11] |= s->mcu_mode & 0x03; /* MCU mode (2 bits) */
s->out[12] = mcu_offset; /* Next MCU offset */
s->out[13] = mcu_id >> 8; /* MCU ID MSB */
s->out[14] = mcu_id & 0xFF; /* MCU ID LSB */
@ -1173,7 +1175,7 @@ char ssdv_dec_feed(ssdv_t *s, uint8_t *packet)
if(s->packet_id == 0)
{
const char *factor;
char callsign[7];
char callsign[SSDV_MAX_CALLSIGN + 1];
/* Read the fixed headers from the packet */
s->callsign = (packet[2] << 24) | (packet[3] << 16) | (packet[4] << 8) | packet[5];
@ -1350,10 +1352,12 @@ char ssdv_dec_is_packet(uint8_t *packet, int *errors, uint8_t type)
void ssdv_dec_header(ssdv_packet_info_t *info, uint8_t *packet)
{
info->callsign = (packet[2] << 24) | (packet[3] << 16) | (packet[4] << 8) | packet[5];
decode_callsign(info->callsign_s, info->callsign);
info->image_id = packet[6];
info->packet_id = (packet[7] << 8) | packet[8];
info->width = packet[9] << 4;
info->height = packet[10] << 4;
info->eoi = (packet[11] >> 2) & 1;
info->mcu_mode = packet[11] & 0x03;
info->mcu_offset = packet[12];
info->mcu_id = (packet[13] << 8) | packet[14];

5
ssdv.h
View File

@ -39,7 +39,8 @@ extern "C" {
#define TBL_LEN (546) /* Maximum size of the DQT and DHT tables */
#define HBUFF_LEN (16) /* Extra space for reading marker data */
//#define COMPONENTS (3)
#define SSDV_MAX_CALLSIGN (6) /* Maximum number of characters in a callsign */
#define SSDV_TYPE_NORMAL (0)
#define SSDV_TYPE_NOFEC (1)
@ -126,10 +127,12 @@ typedef struct
typedef struct {
uint32_t callsign;
char callsign_s[SSDV_MAX_CALLSIGN + 1];
uint8_t image_id;
uint16_t packet_id;
uint16_t width;
uint16_t height;
uint8_t eoi;
uint16_t mcu_mode;
uint8_t mcu_offset;
uint16_t mcu_id;