SILK audio codec wrapper implementation

[nanang]

Requirements:

• Desktop platforms:
  • Get SILK SDK 1.0.8 or 1.0.9 FLP/FIX (floating/fixed point version) from ​here (it's no longer there, so perhaps try ​here).
• Mobile platforms:
  • iOS:
    • Get SILK SDK 1.0.8 ARM version from ​here
  • Android:
    • Get SILK SDK 1.0.8 or 1.0.9 FLP/FIX

How to build:

• Windows platforms:
  1. Build SILK SDK (the FLP version is recommended) using SILK provided VS2005 & VS2010 solutions. The output library, i.e: SKP_Silk_FLP_Win32_debug.lib for debug mode and SKP_Silk_FLP_Win32_mt.lib for release mode, will be in the SILK "src" folder.
  2. Add include and library path for SILK in the Visual Studio settings. For example, the include path should point to SILK "interface" folder and the library path should point to the SILK 'src' folder.
  3. Define SILK codec support in pjlib/include/pj/config_site.h:

     #define PJMEDIA_HAS_SILK_CODEC		    1
     

• Makefile based platforms:
  1. Run make in the SILK SDK directory. Note for iOS/Android platform: modify Makefile to use the correct iPhone SDK/Android NDK version and compiler if necessary.
  2. Run PJSIP's configure script with the option --with-silk=your_silk_sdk_flp/fix_dir

[nanang]

In 4264:

Re #1586: Initial version of SILK wrapper.

[ming]

In [4265]:

Re #1586: Add build config for SILK

[bennylp]

In 4270:

More re #1586: added PJMEDIA_HAS_SILK_CODEC to config_auto.h.in

[ming]

In 4271:

Re #1586: Removed configure warning when using --with-silk option

[ming]

In 4272:

Re #1586: Implement SILK config setting and fixed decoding fmtp

[ming]

In 4278:

Re #1586: Add support for SILK multiple frames per packet

[ming]

In 4293:

Re #1586: Fixed useInBandFEC setting and default value setting in pjmedia_codec_silk_set_config()

[ming]

In 4328:

Re #1586: Fixed samples_per_frame calculation

[ming]

In r4339:

Re #1586: Try to store the number of frames in the packet in case SKP_Silk_SDK_get_TOC() couldn't return the correct number of frames during decode

This was reported to happen in SILK ARM version (thanks to Marcus for the report)