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RTC: Merge srs_rtp_seq_distance with srs_seq_is_newer

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忘篱 2020-05-17 09:03:40 +08:00
parent 3f5ab8dc63
commit d603b1580e
5 changed files with 76 additions and 85 deletions
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11
trunk/src/app/srs_app_rtc_queue.hpp
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@ -34,17 +34,6 @@ class SrsRtpPacket2;
class SrsRtpQueue;
class SrsRtpRingBuffer;
// The "distance" between two uint16 number, for example:
// distance(prev_value=3, value=5) === (int16_t)(uint16_t)((uint16_t)3-(uint16_t)5) === -2
// distance(prev_value=3, value=65534) === (int16_t)(uint16_t)((uint16_t)3-(uint16_t)65534) === 5
// distance(prev_value=65532, value=65534) === (int16_t)(uint16_t)((uint16_t)65532-(uint16_t)65534) === -2
// For RTP sequence, it's only uint16 and may flip back, so 3 maybe 3+0xffff.
// @see https://mp.weixin.qq.com/s/JZTInmlB9FUWXBQw_7NYqg
inline int16_t srs_rtp_seq_distance(const uint16_t& prev_value, const uint16_t& value)
{
return (int16_t)(value - prev_value);
}
// For UDP, the packets sequence may present as bellow:
// [seq1(done)|seq2|seq3 ... seq10|seq11(lost)|seq12|seq13]
// \___(head_sequence_) \ \___(highest_sequence_)