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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <assert.h>
#define IPECAMERA_MAX_LINES 1088
#define IPECAMERA_MAX_CHANNELS 16
#define IPECAMERA_PIXELS_PER_CHANNEL 128
#define IPECAMERA_WIDTH (IPECAMERA_MAX_CHANNELS * IPECAMERA_PIXELS_PER_CHANNEL)
#define IPECAMERA_HEIGHT 1088
int ipecamera_channel_order[IPECAMERA_MAX_CHANNELS] = { 15, 13, 14, 12, 10, 8, 11, 7, 9, 6, 5, 2, 4, 3, 0, 1 };
#define CHECK_VALUE(value, expected) \
if (value != expected) { \
fprintf(stderr, "<%s:%i> 0x%x != 0x%x\n", __FILE__, __LINE__, value, expected); \
err = 1; \
}
#define CHECK_FLAG(flag, check, ...) \
if (!(check)) { \
fprintf(stderr, "<%s:%i> Unexpected value 0x%x of " flag "\n", __FILE__, __LINE__, __VA_ARGS__); \
err = 1; \
}
static int ipecamera_get_payload(uint16_t *pixel_buffer,
int line_req, size_t size,
uint32_t *payload,
int *advance, int *increase_line)
{
int ppw;
int err = 0;
uint32_t info = payload[0];
int channel = info & 0x0F; // 4 bits
int line = (info >> 4) & 0x7FF; // 11 bits
int bpp = (info >> 16) & 0x0F; // 4 bits
int pixels = (info >> 20) & 0xFF; // 8 bits
int header = (info >> 30) & 0x03; // 2 bits
int bytes, pix, pix_offset = 0;
uint32_t data;
*increase_line = channel == 15 ? 1 : 0;
channel = ipecamera_channel_order[channel];
CHECK_FLAG("payload header magick", header == 2, header);
CHECK_FLAG("pixel size, only 10 bits are supported", bpp == 10, bpp);
CHECK_FLAG("row number, should be %i", line == line_req, line, line_req);
CHECK_FLAG("channel, limited by %i output channels", channel < IPECAMERA_MAX_CHANNELS, channel, IPECAMERA_MAX_CHANNELS);
if ((line < 2) && (pixels == (IPECAMERA_PIXELS_PER_CHANNEL - 1))) {
pix_offset = 1;
pixel_buffer[channel*IPECAMERA_PIXELS_PER_CHANNEL] = 0;
}
else
CHECK_FLAG("number of pixels, %i is expected", pixels == IPECAMERA_PIXELS_PER_CHANNEL, pixels, IPECAMERA_PIXELS_PER_CHANNEL);
bytes = pixels / 3;
ppw = pixels - bytes * 3;
if (ppw)
++bytes;
CHECK_FLAG("payload data bytes, at least %i are expected", bytes < size, (unsigned int) size, bytes);
if (err)
return err;
pix = pix_offset;
for (int i = 1; i < bytes; i++) {
data = payload[i];
header = (data >> 30) & 0x03;
CHECK_FLAG("payload data magick", header == 3, header);
if (err)
return err;
pixel_buffer[channel*IPECAMERA_PIXELS_PER_CHANNEL + pix++] = (data >> 20) & 0x3FF;
pixel_buffer[channel*IPECAMERA_PIXELS_PER_CHANNEL + pix++] = (data >> 10) & 0x3FF;
pixel_buffer[channel*IPECAMERA_PIXELS_PER_CHANNEL + pix++] = data & 0x3FF;
}
data = payload[bytes];
header = (data >> 30) & 0x03;
CHECK_FLAG("payload data magick", header == 3, header);
CHECK_FLAG("payload footer magick", (data&0x3FF) == 0x55, (data&0x3FF));
if ((err) && ((data & 0x3FF) != 0x55)) {
err = 0;
int counter = 0;
printf(" -> %x\n", data);
while ((data & 0x3FF) != 0x55) {
bytes++;
data = payload[bytes];
counter++;
}
printf("skipped %i bytes: found %x\n", counter, data);
}
if (err)
return err;
ppw = pixels % 3;
assert(ppw < 3);
for (int j = 0; j < ppw; j++, pix++)
pixel_buffer[channel*IPECAMERA_PIXELS_PER_CHANNEL + pix] = (data >> (10 * (ppw - j))) & 0x3FF;
*advance = bytes + 1;
return 0;
}
static int ipecamera_parse_image(int first_line, int num_lines,
size_t size, uint32_t *linebuf, int *frames_decoded)
{
int err = 0, current_frame = 0;
int pos = 0, advance, increase_line;
if (size < 16) {
fprintf(stderr, "The payload is tool small, we should have at least 8 header dwords and 8 footer.");
return 1;
}
FILE *fp = fopen("image.dec.raw", "wb");
uint16_t *pixel_buffer = (uint16_t *) malloc(num_lines * IPECAMERA_WIDTH * sizeof(uint16_t));
printf("Decoding");
while (size > 0) {
printf(".");
int line = first_line;
CHECK_VALUE(linebuf[pos++], 0x51111111);
CHECK_VALUE(linebuf[pos++], 0x52222222);
CHECK_VALUE(linebuf[pos++], 0x53333333);
CHECK_VALUE(linebuf[pos++], 0x54444444);
CHECK_VALUE(linebuf[pos++], 0x55555555);
CHECK_VALUE(linebuf[pos++], 0x56666666);
CHECK_VALUE(linebuf[pos++], 0x57777777);
CHECK_VALUE(linebuf[pos++], 0x58888888);
if (err)
return err;
size -= 16;
while ((size > 0) && (line < (first_line + num_lines))) {
err = ipecamera_get_payload(pixel_buffer + line * IPECAMERA_WIDTH,
line - first_line, size, linebuf + pos, &advance, &increase_line);
if (err)
return err;
pos += advance;
size -= advance;
line += increase_line;
}
CHECK_FLAG("lines read, we expect to read exactly %i lines", line == (first_line + num_lines), line - first_line, num_lines);
CHECK_VALUE(linebuf[pos++], 0x0AAAAAAA);
CHECK_VALUE(linebuf[pos++], 0x0BBBBBBB);
CHECK_VALUE(linebuf[pos++], 0x0CCCCCCC);
CHECK_VALUE(linebuf[pos++], 0x0DDDDDDD);
CHECK_VALUE(linebuf[pos++], 0x0EEEEEEE);
CHECK_VALUE(linebuf[pos++], 0x0FFFFFFF);
CHECK_VALUE(linebuf[pos++], 0x00000000);
CHECK_VALUE(linebuf[pos++], 0x01111111);
fwrite(pixel_buffer, IPECAMERA_WIDTH * num_lines, sizeof(uint16_t), fp);
if (linebuf[pos] == 0)
break;
current_frame++;
}
fclose(fp);
free(pixel_buffer);
printf("\n");
*frames_decoded = current_frame + 1;
return err;
}
int main(int argc, char const* argv[])
{
if (argc < 3) {
fprintf(stderr, "Usage: ipedec <filename> <number of lines per frame>\n");
return 1;
}
FILE *fp = fopen(argv[1], "rb");
if (fp == NULL) {
fprintf(stderr, "Couldn't open file %s", argv[1]);
return 1;
}
const int lines_per_frame = atoi(argv[2]);
fseek(fp, 0, SEEK_END);
const size_t length = ftell(fp);
rewind(fp);
char *buffer = (char *) malloc(length);
if (buffer == NULL) {
fclose(fp);
return 1;
}
size_t buffer_length = fread(buffer, 1, length, fp);
fclose(fp);
if (buffer_length != length) {
free(buffer);
return 1;
}
int num_frames;
if (ipecamera_parse_image(0, lines_per_frame, length, (uint32_t *) buffer, &num_frames))
fprintf(stderr, "Couldn't parse image\n");
printf("Decoded %i frames.\n", num_frames);
free(buffer);
return 0;
}
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