opus rtp format 學習比較

#opus rtp timestamp

不管編碼時間是多少採樣率。opus rtp時間戳統一 是4800增長。

Opus supports 5 different audio bandwidths, which can be adjusted
   during a call.  The RTP timestamp is incremented with a 48000 Hz
   clock rate for all modes of Opus and all sampling rates.  The unit
   for the timestamp is samples per single (mono) channel.  The RTP
   timestamp corresponds to the sample time of the first encoded sample
   in the encoded frame.  For data encoded with sampling rates other
   than 48000 Hz, the sampling rate has to be adjusted to 48000 Hz using
   the corresponding multiplier in Table 2.

                    +--------------------+------------+
                    | Sampling Rate (Hz) | Multiplier |
                    +--------------------+------------+
                    |        8000        |     6      |
                    |                    |            |
                    |       12000        |     4      |
                    |                    |            |
                    |       16000        |     3      |
                    |                    |            |
                    |       24000        |     2      |
                    |                    |            |
                    |       48000        |     1      |
                    +--------------------+------------+

                       Table 2: Timestamp multiplier

opus FEC