高度灵活的音频编解码器:Opus
jopen
11年前
Opus是一个完全开放的,免版权费的,高度灵活的音频编解码器。 Opus是通过互联网传输的交互式语音和音乐,但也适用于存储和流媒体应用。它是由IETF Codec工作组协同Skype的SILK codec和Xiph.Org的CELT codec设计的。
技术细节
Opus codec 被设计来处理大部分的交互式音频和视频包括,Voice over IP,网络会议,游戏中聊天,甚至远程音乐会。它可以在不同的网络带宽环境中自适应。目前的功能有:
- Bit-rates from 6 kb/s to 510 kb/s
- Sampling rates from 8 kHz (narrowband) to 48 kHz (fullband)
- Frame sizes from 2.5 ms to 60 ms
- Support for both constant bit-rate (CBR) and variable bit-rate (VBR)
- Audio bandwidth from narrowband to fullband
- Support for speech and music
- Support for mono and stereo
- Support for up to 255 channels (multistream frames)
- Dynamically adjustable bitrate, audio bandwidth, and frame size
- Good loss robustness and packet loss concealment (PLC)
- Floating point and fixed-point implementation