libcaption_stauts_t sei_parse(sei_t* sei, const uint8_t* data, size_t size, double timestamp)
{
sei_init(sei, timestamp);
int ret = 0;
// SEI may contain more than one payload
while (1 < size) {
size_t payloadType = 0;
size_t payloadSize = 0;
while (0 < size && 255 == (*data)) {
payloadType += 255;
++data, --size;
}
if (0 == size) {
return LIBCAPTION_ERROR;
}
payloadType += (*data);
++data, --size;
while (0 < size && 255 == (*data)) {
payloadSize += 255;
++data, --size;
}
if (0 == size) {
return LIBCAPTION_ERROR;
}
payloadSize += (*data);
++data, --size;
if (payloadSize) {
sei_message_t* msg = sei_message_new((sei_msgtype_t)payloadType, 0, payloadSize);
uint8_t* payloadData = sei_message_data(msg);
size_t bytes = _copy_to_rbsp(payloadData, payloadSize, data, size);
sei_message_append(sei, msg);
if (bytes < payloadSize) {
return LIBCAPTION_ERROR;
}
data += bytes;
size -= bytes;
++ret;
}
}
// There should be one trailing byte, 0x80. But really, we can just ignore that fact.
return LIBCAPTION_OK;
}
int sei_parse_nalu (sei_t* sei, const uint8_t* data, size_t size, double dts, double cts)
{
assert (0<=cts); // cant present before decode
sei->dts = dts;
sei->cts = cts;
int ret = 0;
if (0 == data || 0 == size) {
return 0;
}
uint8_t nal_unit_type = (*data) & 0x1F;
++data; --size;
if (6 != nal_unit_type) {
return 0;
}
// SEI may contain more than one payload
while (1<size) {
int payloadType = 0;
int payloadSize = 0;
while (0 < size && 255 == (*data)) {
payloadType += 255;
++data; --size;
}
if (0 == size) {
goto error;
}
payloadType += (*data);
++data; --size;
while (0 < size && 255 == (*data)) {
payloadSize += 255;
++data; --size;
}
if (0 == size) {
goto error;
}
payloadSize += (*data);
++data; --size;
if (payloadSize) {
sei_message_t* msg = sei_message_new ( (sei_msgtype_t) payloadType, 0, payloadSize);
uint8_t* payloadData = sei_message_data (msg);
size_t bytes = _copy_to_rbsp (payloadData, payloadSize, data, size);
sei_message_append (sei, msg);
if ( (int) bytes < payloadSize) {
goto error;
}
data += bytes; size -= bytes;
++ret;
}
}
// There should be one trailing byte, 0x80. But really, we can just ignore that fact.
return ret;
error:
sei_init (sei);
return 0;
}
