all... I want to try ffmpeg hw accelerate with libstagefright_h264 for android device. Seems that the source code has a little bit old with ffmpeg 2.2.1 and android 4.2.2. So I try to update the source code but when I only write just a little code like following:
struct FFSource : public MediaSource {
virtual status_t start(MetaData *params) { return -1; }
virtual status_t stop() { return -1; }
virtual sp<MetaData> getFormat() { return sp<MetaData>(); }
virtual status_t read(
MediaBuffer **buffer, const ReadOptions *options) { return -1; }
};
static av_cold int Stagefright_init(AVCodecContext *avctx)
{
av_log(avctx, AV_LOG_ERROR, "In function: %s\n", __FUNCTION__);
FFSource *decoder;
sp<MediaSource> mediaSource;
decoder = new FFSource();
return -1;
}
it tells me like following when I run the code: cannot locate symbol "_ZTIN7android11MediaSourceE" referenced by "libavcodec-55.so"...
And the result show the nm command for libavcodec-55.so:
[cxm@ubuntu ffmpeg-2.2.1.lsc]$nm ./libavcodec/libavcodec.so | grep Source
003a31a8 t _ZN7android11MediaSource10setBuffersERKNS_6VectorIPNS_11MediaBufferEEE
003a319c t _ZN7android11MediaSource5pauseEv
U _ZN7android11MediaSourceC2Ev
U _ZN7android11MediaSourceD0Ev
U _ZN7android11MediaSourceD1Ev
U _ZN7android11MediaSourceD2Ev
003a31d0 t _ZN8FFSource4readEPPN7android11MediaBufferEPKNS0_11MediaSource11ReadOptionsE
003a31bc t _ZN8FFSource4stopEv
003a31b4 t _ZN8FFSource5startEPN7android8MetaDataE
003a31c4 t _ZN8FFSource9getFormatEv
003a3340 t _ZN8FFSourceD0Ev
003a32e0 t _ZN8FFSourceD1Ev
007b29f0 d _ZTC8FFSource0_N7android11MediaSourceE
007b29e0 d _ZTI8FFSource
U _ZTIN7android11MediaSourceE
006ac028 r _ZTS8FFSource
007b2970 d _ZTT8FFSource
U _ZTv0_n12_N7android11MediaSourceD0Ev
U _ZTv0_n12_N7android11MediaSourceD1Ev
003a3330 t _ZTv0_n12_N8FFSourceD0Ev
003a32d0 t _ZTv0_n12_N8FFSourceD1Ev
007b2980 d _ZTV8FFSource
Also I cannot find _ZTIN7android11MediaSourceE in libstagefright.so. I think there's any mistake I have in writing the source code instead of mis-link the stagefright library. I use android standalone toolchain to compile ffmpeg source. Like following configuration:
function config_lsf
{
# build flags
PREFIX=/home/cxm/work/Android/proj/dy-proj-careye/dy-proj-careye/jni/src/lib/android/ FLAGS="--prefix=$PREFIX"
FLAGS="$FLAGS --disable-static"
FLAGS="$FLAGS --disable-doc"
FLAGS="$FLAGS --disable-programs"
FLAGS="$FLAGS --disable-avdevice"
FLAGS="$FLAGS --disable-symver"
FLAGS="$FLAGS --enable-shared"
FLAGS="$FLAGS --cross-prefix=arm-linux-androideabi-"
FLAGS="$FLAGS --target-os=linux"
FLAGS="$FLAGS --arch=arm"
FLAGS="$FLAGS --enable-cross-compile"
FLAGS="$FLAGS --disable-decoder=h264"
FLAGS="$FLAGS --disable-decoder=h264_vdpau"
FLAGS="$FLAGS --enable-libstagefright-h264"
# cflags
CFLAGS="-Os -fpic -marm"
ANDROID_SOURCE=../mokesoures/
ANDROID_LIBS=../android-libs
CFLAGS="$CFLAGS -I$ANDROID_SOURCE/frameworks/av/include"
CFLAGS="$CFLAGS -I$ANDROID_SOURCE/frameworks/native/include/"
CFLAGS="$CFLAGS -I$ANDROID_SOURCE/system/core/include"
CFLAGS="$CFLAGS -I$ANDROID_SOURCE/hardware/libhardware/include"
CFLAGS="$CFLAGS -I$ANDROID_SOURCE/frameworks/native/include/media/openmax/"
# ld flags
LDFLAGS="-Wl,--fix-cortex-a8"
LDFLAGS="$LDFLAGS -lstdc++ -lgnustl_shared -lstagefright -lutils -lbinder"
LDFLAGS="$LDFLAGS -L$ANDROID_LIBS"
LDFLAGS="$LDFLAGS -Wl,-rpath-link,$ANDROID_LIBS"
./configure.android $FLAGS --extra-cflags="$CFLAGS" \
--extra-ldflags="$LDFLAGS" \
sed -i 's/#define\ HAVE_POSIX_MEMALIGN\ 1/#define\ HAVE_POSIX_MEMALIGN\ 0/' ./config.h
make -j4 V=1 2>&1 | tee log
make install
}
Please help about this topic. Thanks very much.
_ZTIN7android11MediaSourceE is typeinfo for android::MediaSource. You probably have -frtti enabled in your build configuration, but Android libraries do not include run-time type information; so, you should remove this flag at least from FFSource class.