* Using AbortController in fetch-stream-loader.js

* create pull-request

* Update fetch-stream-loader.js

修复在进入请求_pump前调用abort请求没中断的问题

* Update fetch-stream-loader.js

修复在进入请求_pump前调用abort请求没中断的问题

* use a new silent frame insert algorithm for audio remux.
the old algorithm cannot cover some common situation, like:
1. audio frame dts does not increase by a standard duration, sometimes it increase for a large duration(more than 1.5 * refSampleDuration), sometimes it increase for a small duration. But the average duration is more or less to refSampleDuration. the old algorithm would insert silent frames which result into video/audio unsync.
2. for network living stream, because of network jitter or frame lost, the encoder would generate the audio frames whose dts is not correct. but if the gap between two adjacent frame is not over 1.5 * refSampleDuration and the accumulate gap would become larger and larger. the old algorithm never insert silent frames for this case.

* initialize _audioNextRefDts when seeking

* fix: lint error

* test

* fix a curRefDts update mistake

* reuse some original variable which has the same meaning

* fix some variable mistake

* bug fix: incorrect byte length

Co-authored-by: xiaosong <kunkkaco@gmail.com>
Co-authored-by: wangjiankai <wangjiankai@cmhi.chinamobile.com>

This reverts commit 3cd67b3.

This reverts commit 09982ef.