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fixed overflow and sync timeout handling in robot36 decoder

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This commit is contained in:
Ahmet Inan 2015-01-02 12:10:32 +01:00
parent 8421a984e7
commit 8263145a50
1 changed files with 10 additions and 5 deletions
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15
app/src/main/rs/decoder.rs
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@ -62,7 +62,7 @@ static void save_buffer()
saved_buffer[i] = pixel_buffer[i];
}
static void robot36_decoder()
static void robot36_decoder(int sync_timeout)
{
static int prev_timeout, mismatch_counter, parity, latch;
if (!prev_timeout && 2 * abs(seperator_counter) > seperator_length)
@ -73,17 +73,19 @@ static void robot36_decoder()
parity = 0;
latch = 1;
}
prev_timeout = hpos >= maximum_length;
prev_timeout = sync_timeout;
static int even_sync_pos, odd_sync_pos;
if (parity) {
odd_sync_pos = prev_sync_pos;
int even_vpos = vpos;
int odd_vpos = (vpos + 1) % maximum_height;
for (int i = 0; i < bitmap_width; ++i) {
uchar even_y = value_blur(i, even_sync_pos + y_begin, even_sync_pos + y_end);
uchar v = value_blur(i, even_sync_pos + v_begin, even_sync_pos + v_end);
uchar odd_y = value_blur(i, odd_sync_pos + y_begin, odd_sync_pos + y_end);
uchar u = value_blur(i, odd_sync_pos + u_begin, odd_sync_pos + u_end);
pixel_buffer[bitmap_width * vpos + i] = yuv(even_y, u, v);
pixel_buffer[bitmap_width * (vpos+1) + i] = yuv(odd_y, u, v);
pixel_buffer[bitmap_width * even_vpos + i] = yuv(even_y, u, v);
pixel_buffer[bitmap_width * odd_vpos + i] = yuv(odd_y, u, v);
}
vpos += 2;
latch = 0;
@ -196,16 +198,19 @@ void decode(int samples) {
seperator_counter = 0;
continue;
}
int sync_timeout;
if (hpos >= maximum_length) {
sync_timeout = 1;
hpos -= scanline_length;
prev_sync_pos = sync_pos;
sync_pos += scanline_length;
} else {
sync_timeout = 0;
hpos = buffer_pos - sync_pos;
}
switch (current_decoder) {
case decoder_robot36:
robot36_decoder();
robot36_decoder(sync_timeout);
break;
case decoder_yuv:
yuv_decoder();