SPEEX ON ANDROID

JSpeex does not work very well on Android, encoding times are between 0.03 to 0.2 seconds for a 320 samples frame. Way to much for any real-time app (can you say in-game voice chat? :p). So i set out to get the native speex to compile for Android. A couple of steps are involved if you don’t want to go the configure road with ndk r5b.

1. Download the latest speex source distri.
2. Create your project’s folder, and a jni/ folder inside that folder
3. Copy the libspeex/ and include/ folders from the speex distri to your jni/ folder. You should end up with $project/jni/libspeex and $project/jni/include
4. Add the following thingy as your Android.mk file in your jni/ folder
   

   LOCAL_PATH := $(call my-dir)
    
   include $(CLEAR_VARS)
    
   LOCAL_MODULE    := libspeex
   LOCAL_CFLAGS = -DFIXED_POINT -DUSE_KISS_FFT -DEXPORT="" -UHAVE_CONFIG_H
   LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
    
   LOCAL_SRC_FILES :=  \
   ./libspeex/bits.c \
   ./libspeex/buffer.c \
   ./libspeex/cb_search.c \
   ./libspeex/exc_10_16_table.c \
   ./libspeex/exc_10_32_table.c \
   ./libspeex/exc_20_32_table.c \
   ./libspeex/exc_5_256_table.c \
   ./libspeex/exc_5_64_table.c \
   ./libspeex/exc_8_128_table.c \
   ./libspeex/fftwrap.c \
   ./libspeex/filterbank.c \
   ./libspeex/filters.c \
   ./libspeex/gain_table.c \
   ./libspeex/gain_table_lbr.c \
   ./libspeex/hexc_10_32_table.c \
   ./libspeex/hexc_table.c \
   ./libspeex/high_lsp_tables.c \
   ./libspeex/jitter.c \
   ./libspeex/kiss_fft.c \
   ./libspeex/kiss_fftr.c \
   ./libspeex/lpc.c \
   ./libspeex/lsp.c \
   ./libspeex/lsp_tables_nb.c \
   ./libspeex/ltp.c \
   ./libspeex/mdf.c \
   ./libspeex/modes.c \
   ./libspeex/modes_wb.c \
   ./libspeex/nb_celp.c \
   ./libspeex/preprocess.c \
   ./libspeex/quant_lsp.c \
   ./libspeex/resample.c \
   ./libspeex/sb_celp.c \
   ./libspeex/scal.c \
   ./libspeex/smallft.c \
   ./libspeex/speex.c \
   ./libspeex/speex_callbacks.c \
   ./libspeex/speex_header.c \
   ./libspeex/stereo.c \
   ./libspeex/vbr.c \
   ./libspeex/vq.c \
   ./libspeex/window.c
    
   include $(BUILD_SHARED_LIBRARY)

   
   
   
5. Add the following thingy as your Application.mk file in the jni/ folder

   APP_ABI := armeabi armeabi-v7a
   

   This will compile binaries for the arm and arm-v7a cpus.

6. Add the following thingy as a file called speex_config_types.h to the $project/jni/include/speex/ folder.
   

   #ifndef __SPEEX_TYPES_H__
   #define __SPEEX_TYPES_H__
   typedef short spx_int16_t;
   typedef unsigned short spx_uint16_t;
   typedef int spx_int32_t;
   typedef unsigned int spx_uint32_t;
   #endif

   
   
   
7. switch to the jni/ folder in your shell and type ndk-build. You’ll end up with shared libs in the libs/armeabi and libs/armeabi-v7a folder
8. Write a JNI wrapper for decoding and encoding
9. …
10. Profit!

I zipped up my jni folder, you can download it here. Just fire up your shell, make sure your NDK is in your $PATH and ndk-build the shit out of it. Enjoy.

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