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CEA-708: Fix delayed presentation of some captions.

Patch from argilo@gmail.com (received with thanks) - see #10273 for
details. Fixes a number of test streams with no obvious regressions.

Closes #10273

Cherry picker from master f8312c3
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commit af6364b2c25ac1f57cbfa0cedf6ecc2fd445ad1e 1 parent 4627dc9
Mark Kendall authored
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9 mythtv/libs/libmythtv/avformatdecoder.cpp
@@ -2577,14 +2577,19 @@ void AvFormatDecoder::DecodeDTVCC(const uint8_t *buf, uint len)
{
uint cc_code = buf[2+(cur*3)];
bool cc_valid = cc_code & 0x04;
- if (!cc_valid)
- continue;
uint data1 = buf[3+(cur*3)];
uint data2 = buf[4+(cur*3)];
uint data = (data2 << 8) | data1;
uint cc_type = cc_code & 0x03;
+ if (!cc_valid)
+ {
+ if (cc_type >= 0x2)
+ ccd708->decode_cc_null();
+ continue;
+ }
+
if (cc_type <= 0x1) // EIA-608 field-1/2
{
if (cc608_good_parity(cc608_parity_table, data))
View
7 mythtv/libs/libmythtv/cc708decoder.cpp
@@ -62,6 +62,13 @@ void CC708Decoder::decode_cc_data(uint cc_type, uint data1, uint data2)
}
}
+void CC708Decoder::decode_cc_null(void)
+{
+ if (partialPacket.size && reader)
+ parse_cc_packet(reader, &partialPacket, last_seen);
+ partialPacket.size = 0;
+}
+
void CC708Decoder::services(uint seconds, bool seen[64]) const
{
time_t now = time(NULL);
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1  mythtv/libs/libmythtv/cc708decoder.h
@@ -32,6 +32,7 @@ class CC708Decoder
~CC708Decoder() {}
void decode_cc_data(uint cc_type, uint data1, uint data2);
+ void decode_cc_null(void);
/// \return Services seen in last few seconds as specified.
void services(uint seconds, bool[64]) const;
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