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libcaption: fix bit set on indent preambles

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style preambles look like:

|P|0|0|1|C|0|ROW| |P|1|N|0|STYLE|U|

and column preambles look like:

|P|0|0|1|C|0|ROW| |P|1|N|1|CURSR|U|

Both preambles go through eia608_row_pramble(), the value they
pass as the x parameter is supposed to hold 4 bits, either
0|STYLE

or 1|CURSR

This value then gets bit-shifted by 1 and or'd in the second byte.

The value is also and' with 0x1E to ensure it can't leak into
the upper bits.

The previous code resulted in x being a 5-bit value, 0x10 (0b10000).
This resulted in outputting a style preamble, as 0x10 << 1 & 0x1E
is 0b00000. When the indent was 0 (the usual case), this went
undetected, but with any other value it resulted in no indent being
applied, but the text getting colored or italicized.

This patch fixes x to have the correct value of 0x8 | indent.
This commit is contained in:
Mathieu Duponchelle 2020-11-20 21:33:45 +01:00
parent a3dafea688
commit a7180e3995
2 changed files with 5 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
video/closedcaption/src/c/eia608.c
View file

@ -53,7 +53,7 @@ eia608_row_pramble (int row, int chan, int x, int underline)
uint16_t
eia608_row_column_pramble (int row, int col, int chan, int underline)
{
return eia608_row_pramble (row, chan, 0x10 | (col / 4), underline);
return eia608_row_pramble (row, chan, 0x8 | (col / 4), underline);
}
uint16_t

8
video/closedcaption/tests/tttocea608.rs
View file

@ -73,8 +73,8 @@ fn test_one_timed_buffer_and_eos() {
(733_333_333.into(), 33_333_334.into(), [0x94, 0x20]), /* control doubled */
(766_666_667.into(), 33_333_333.into(), [0x94, 0xae]), /* erase_non_displayed_memory */
(800_000_000.into(), 33_333_333.into(), [0x94, 0xae]), /* control doubled */
(833_333_333.into(), 33_333_334.into(), [0x94, 0x40]), /* preamble */
(866_666_667.into(), 33_333_333.into(), [0x94, 0x40]), /* control doubled */
(833_333_333.into(), 33_333_334.into(), [0x94, 0xd0]), /* preamble */
(866_666_667.into(), 33_333_333.into(), [0x94, 0xd0]), /* control doubled */
(900_000_000.into(), 33_333_333.into(), [0xc8, 0xe5]), /* H e */
(933_333_333.into(), 33_333_334.into(), [0xec, 0xec]), /* l l */
(966_666_667.into(), 33_333_333.into(), [0xef, 0x80]), /* o, nil */
@ -320,8 +320,8 @@ fn test_one_timed_buffer_and_eos_roll_up2() {
(1_033_333_333.into(), 33_333_334.into(), [0x94, 0x2c]), /* control doubled */
(1_066_666_667.into(), 33_333_333.into(), [0x94, 0x25]), /* roll_up_2 */
(1_100_000_000.into(), 33_333_333.into(), [0x94, 0x25]), /* control doubled */
(1_133_333_333.into(), 33_333_334.into(), [0x94, 0xe0]), /* preamble */
(1_166_666_667.into(), 33_333_333.into(), [0x94, 0xe0]), /* control doubled */
(1_133_333_333.into(), 33_333_334.into(), [0x94, 0x70]), /* preamble */
(1_166_666_667.into(), 33_333_333.into(), [0x94, 0x70]), /* control doubled */
(1_200_000_000.into(), 33_333_333.into(), [0xc8, 0xe5]), /* H e */
(1_233_333_333.into(), 33_333_334.into(), [0xec, 0xec]), /* l l */
(1_266_666_667.into(), 33_333_333.into(), [0xef, 0x80]), /* o, nil */