Opened 8 years ago

Closed 8 years ago

Last modified 7 years ago

#1904 closed enhancement (fixed)

Support for Opus codec

Reported by: ming Owned by: nanang
Priority: normal Milestone: release-2.5
Component: pjmedia Version: trunk
Keywords: Cc:
Backport to 1.x milestone: Backported: no

Description (last modified by ming)

Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmission over the Internet, but is also intended for storage and streaming applications. It is standardized by the Internet Engineering Task Force (IETF) as RFC 6716 which incorporated technology from Skype's SILK codec and Xiph.Org's CELT codec. (From

How to use:

  1. Download Opus source code from here (latest stable release 1.1.2 or above is recommended).
  2. Build Opus:
    1. For iOS, get the build script here or here.
    2. For Android, get the Android makefile attached in this ticket (tested with Opus 1.1.2), or check here
      • create jni folder in Opus root directory and put from this ticket attachment in there
      • run ndk-build from Opus root directory
      • make a new folder called opus-dev-lib and create subfolders: include/opus and lib in it
      • copy Opus header files from [OPUS_ROOT_DIR]/include to opus-dev-lib/include/opus and libopus.a file from [OPUS_ROOT_DIR]/obj/local/armeabi to opus-dev-lib/lib
    3. For GNU build system, e.g: *nix, Linux, MacOS, just invoke ./configure, make, and make install.
    4. For Windows:
      • use GNU build tools such as MinGW, or
      • use VS solution & projects provided by Opus (usually in win32 dir), then modify the following line in the end of pjmedia/src/pjmedia-codec/opus.c appropriately:
         #   pragma comment(lib, "libopus.a")
  1. Run PJSIP's configure script with the option --with-opus=your_opus_installation_dir. For example on Android platform:
    ./configure-android --with-opus=[absolute-path-to]/opus-dev-lib
  2. Verify if it's a sucess:
    checking for OPUS installations..
    Using OPUS prefix... [absolute-path-to]/opus-dev-lib/
    checking opus/opus.h usability... yes
    checking opus/opus.h presence... yes
    checking for opus/opus.h... yes
    checking for opus_repacketizer_get_size in -lopus... yes
    OPUS library found, OPUS support enabled

Opus Codec Settings

General codec settings for this codec such as VAD and PLC can be
manipulated through the setting field in #pjmedia_codec_param
(see the documentation of #pjmedia_codec_param for more info).

For Opus codec specific settings, such as sample rate,
channel count, bit rate, complexity, and CBR, can be configured
in #pjmedia_codec_opus_config.
The default setting of sample rate is specified in
bitrate is specified in #PJMEDIA_CODEC_OPUS_DEFAULT_BIT_RATE.
And the default setting of complexity is specified in

After modifying any of these settings, application needs to call
#pjmedia_codec_opus_set_default_param(), which will generate the
appropriate decoding fmtp attributes.

Here is an example of modifying the codec settings:

   pjmedia_codec_param param;
   pjmedia_codec_opus_config opus_cfg;

   pjmedia_codec_mgr_get_default_param(.., &param);
   // Set VAD
   param.setting.vad = 1;
   // Set PLC
   param.setting.vad = 1;
   // Set sample rate
   opus_cfg.sample_rate = 16000;
   // Set channel count
   opus_cfg.channel_cnt = 2;
   // Set bit rate
   opus_cfg.bit_rate = 20000;
   pjmedia_codec_opus_set_default_param(&opus_cfg, &param);

Attachments (1) (1.0 KB) - added by nanang 8 years ago.
Android Makefile (tested with Opus 1.1.2)

Download all attachments as: .zip

Change History (6)

comment:1 Changed 8 years ago by ming

  • Resolution set to fixed
  • Status changed from new to closed

In 5239:

Fixed #1904: Support for Opus codec

comment:2 Changed 8 years ago by ming

  • Description modified (diff)

comment:3 Changed 8 years ago by nanang

  • Description modified (diff)

Changed 8 years ago by nanang

Android Makefile (tested with Opus 1.1.2)

comment:4 Changed 8 years ago by nanang

  • Description modified (diff)

comment:5 Changed 7 years ago by ming

  • Description modified (diff)
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