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• Revision e253eaa036 : Unify the high bit-depth forward hybrid transforms The SSE2 version high bit-de

  20 juillet 2015, par Jingning Han

  Changed Paths :
   Modify /test/dct16x16_test.cc

  
   Modify /test/fdct4x4_test.cc

  
   Modify /vp9/common/vp9_rtcd_defs.pl

  
   Modify /vp9/encoder/x86/vp9_dct_sse2.c

  
  
  Unify the high bit-depth forward hybrid transforms

  The SSE2 version high bit-depth forward hybrid transforms are
  essentially using the C functions via cross referencing to 1-D
  functions in vp9_dct.c. This commit unifies the two versions and
  removes the unnecessary dependency.

  Change-Id : Ib4d0702a138f8daf7d0bd97c141ee7088f293765

• cygwin make errors : ffmpeg compile with ndk

  1er mars 2013, par Bryce

  Recently I'm compiling ffmpeg for android with ndk and I do this as this article(http://vec.io/posts/how-to-build-ffmpeg-with-android-ndk ). configure is right,
  but when I begin to make, it makes errors.
  configure shell :

  export TMPDIR=D:/temp/android
  
  export NDK=/cygdrive/D/DevelopKit/android-ndk-r8d
  
  export PATH=/cygdrive/C/cygwin/tmp/ffmpeg/bin:$PATH
  
  export CC=arm-linux-androideabi-gcc
  
  export LD=arm-linux-androideabi-ld
  
  export AR=arm-linux-androideabi-ar
  
  export C_INCLUDE_PATH=/cygdrive/C/cygwin/tmp/ffmpeg/sysroot/usr/include
  
  export LIBRARY_PATH=/cygdrive/C/cygwin/tmp/ffmpeg/sysroot/usr/lib
  
  CFLAGS="-O3 -Wall -mthumb -pipe -fpic -fasm \
  
    -finline-limit=300 -ffast-math \
  
    -fstrict-aliasing -Werror=strict-aliasing \
  
    -fmodulo-sched -fmodulo-sched-allow-regmoves \
  
    -Wno-psabi -Wa,--noexecstack \
  
    -D__ARM_ARCH_5__ -D__ARM_ARCH_5E__ \
  
    -D__ARM_ARCH_5T__ -D__ARM_ARCH_5TE__ \
  
    -DANDROID -DNDEBUG"
  
  
  
  EXTRA_CFLAGS="-march=armv7-a -mfpu=neon -mfloat-abi=softfp -mvectorize-with-neon-quad"
  
  EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"
  
  
  
  FFMPEG_FLAGS="--prefix=/tmp/ffmpeg/build \
  
    --target-os=linux \
  
    --arch=arm \
  
    --enable-cross-compile \
  
    --cross-prefix=arm-linux-androideabi- \
  
    --enable-shared \
  
    --disable-symver \
  
    --disable-doc \
  
    --disable-ffplay \
  
    --disable-ffmpeg \
  
    --disable-ffprobe \
  
    --disable-ffserver \
  
    --disable-avdevice \
  
    --disable-avfilter \
  
    --disable-encoders  \
  
    --disable-muxers \
  
    --disable-filters \
  
    --disable-devices \
  
    --disable-everything \
  
    --enable-protocols  \
  
    --enable-parsers \
  
    --enable-demuxers \
  
    --disable-demuxer=sbg \
  
    --enable-decoders \
  
    --enable-bsfs \
  
    --enable-network \
  
    --enable-swscale  \
  
    --enable-asm \
  
    --enable-version3"
  
  
  
  ./configure $FFMPEG_FLAGS --extra-cflags="$CFLAGS $EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS"

  Configure Result(Part of config.mak) :

  ifndef FFMPEG_CONFIG_MAK
  
  FFMPEG_CONFIG_MAK=1
  
  FFMPEG_CONFIGURATION=--prefix=/tmp/ffmpeg/build --target-os=linux --arch=arm --enable-cross-compile --cross-prefix=arm-linux-androideabi- --enable-shared --disable-symver --disable-doc --disable-ffplay --disable-ffmpeg --disable-ffprobe --disable-ffserver --disable-avdevice --disable-avfilter --disable-encoders --disable-muxers --disable-filters --disable-devices --disable-everything --enable-protocols --enable-parsers --enable-demuxers --disable-demuxer=sbg --enable-decoders --enable-bsfs --enable-network --enable-swscale --enable-asm --enable-version3 --extra-cflags='-O3 -Wall -mthumb -pipe -fpic -fasm   -finline-limit=300 -ffast-math   -fstrict-aliasing -Werror=strict-aliasing   -fmodulo-sched -fmodulo-sched-allow-regmoves   -Wno-psabi -Wa,--noexecstack   -D__ARM_ARCH_5__ -D__ARM_ARCH_5E__   -D__ARM_ARCH_5T__ -D__ARM_ARCH_5TE__   -DANDROID -DNDEBUG -march=armv7-a -mfpu=neon -mfloat-abi=softfp -mvectorize-with-neon-quad' --extra-ldflags='-Wl,--fix-cortex-a8'
  
  prefix=/tmp/ffmpeg/build
  
  LIBDIR=$(DESTDIR)${prefix}/lib
  
  SHLIBDIR=$(DESTDIR)${prefix}/lib
  
  INCDIR=$(DESTDIR)${prefix}/include
  
  BINDIR=$(DESTDIR)${prefix}/bin
  
  DATADIR=$(DESTDIR)${prefix}/share/ffmpeg
  
  MANDIR=$(DESTDIR)${prefix}/share/man
  
  SRC_PATH=.
  
  ifndef MAIN_MAKEFILE
  
  SRC_PATH:=$(SRC_PATH:.%=..%)
  
  endif
  
  CC_IDENT=gcc 4.6
  
   (GCC)
  
  ARCH=arm
  
  CC=arm-linux-androideabi-gcc
  
  CXX=arm-linux-androideabi-g++
  
  AS=arm-linux-androideabi-gcc
  
  LD=arm-linux-androideabi-gcc
  
  DEPCC=arm-linux-androideabi-gcc
  
  DEPCCFLAGS= $(CPPFLAGS)
  
  DEPAS=arm-linux-androideabi-gcc
  
  DEPASFLAGS= $(CPPFLAGS)
  
  YASM=yasm
  
  DEPYASM=yasm
  
  AR=arm-linux-androideabi-ar
  
  ARFLAGS=rc
  
  AR_O=$@

  But when I make it

  CC  libavformat/4xm.o
  
  In file included from ./libavutil/bswap.h:35:0,
  
                   from ./libavutil/intreadwrite.h:25,
  
                   from libavformat/4xm.c:30:
  
  ./config.h:8:18: warning: missing terminating " character [enabled by default]
  
  In file included from ./libavutil/bswap.h:35:0,
  
                   from ./libavutil/intreadwrite.h:25,
  
                   from libavformat/4xm.c:30:
  
  ./config.h:9:7: warning: missing terminating " character [enabled by default]
  
  ./config.h:9:2: error: missing terminating " character
  
  In file included from ./libavutil/intreadwrite.h:25:0,
  
                   from libavformat/4xm.c:30:
  
  ./libavutil/bswap.h:58:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'static'
  
  common.mak:48: recipe for target `libavformat/4xm.o' failed
  
  make: *** [libavformat/4xm.o] Error 1

  It is the character error and I guess it is the windows character(I'm using cygwin), I tried dos2unix but it didn't work. Please help me and thanks for advising.

• C flags which gives priority to quality for decoded images in ffmpeg

  18 janvier 2016, par Tank2005

  I’m trying to decode h.264 streaming with ffmpeg(latest version) on Android NDK.

  I succeeded to get a decoded frame. But, an aquired image is very dirty even if low latency flag is disabled.

  If I want to give priority to quality over decoding speed, which flags should I specify ?

  bool initCodec(bool low_latency)
  
  {
  
      av_register_all();
  
  
  
      codec = avcodec_find_decoder(AV_CODEC_ID_H264);
  
      if(!codec) return false;
  
  
  
      context = avcodec_alloc_context3(codec);
  
      if(!context) return false;
  
  
  
      if(codec->capabilities & CODEC_CAP_TRUNCATED) context->flags |= CODEC_FLAG_TRUNCATED;
  
      if(low_latency == true) context->flags |= CODEC_FLAG_LOW_DELAY;
  
  
  
      frame = av_frame_alloc();
  
  
  
      int res = avcodec_open2(context, codec, NULL);
  
      if (res < 0) {
  
          qDebug() << "Coundn't open codec :" << res;
  
          return false;
  
      }
  
  
  
      av_init_packet(&avpkt);
  
      return true;
  
  }
  
  
  
  void sendBytes(unsigned char *buf, int buflen)
  
  {
  
      avpkt.size = buflen;
  
      avpkt.data = buf;
  
  
  
      int got_frame, len;
  
      while (avpkt.size > 0) {
  
          len = avcodec_decode_video2(context, frame, &got_frame, &avpkt);
  
          if (len < 0) {
  
              qDebug() << "Error while decoding : " << len;
  
              break;
  
          }
  
          if (got_frame) {
  
              onGotFrame(frame);
  
          }
  
          avpkt.size -= len;
  
          avpkt.data += len;
  
      }
  
  }

  

  Ex : I heard that it made a problem while compiling the library. So I write a compile option here(I built it on OpenSUSE Linux).

  #!/bin/bash
  
  NDK=/home/ndk
  
  SYSROOT=$NDK/platforms/android-9/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  
  function build_one
  
  {
  
  ./configure \
  
  --prefix=$PREFIX \
  
  --enable-shared \
  
  --disable-static \
  
  --disable-avdevice \
  
  --disable-doc \
  
  --disable-symver \
  
  --disable-encoders \
  
  --disable-decoders \
  
  --enable-decoder=h264 \
  
  --enable-decoder=aac \
  
  --disable-protocols \
  
  --disable-demuxers \
  
  --disable-muxers \
  
  --disable-filters \
  
  --disable-network \
  
  --disable-parsers \
  
  --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  --target-os=linux \
  
  --arch=arm \
  
  --enable-asm --enable-yasm \
  
  --enable-cross-compile \
  
  --sysroot=$SYSROOT \
  
  --extra-cflags="-Os -marm -march=armv7-a -mfloat-abi=softfp -mfpu=neon" \
  
  --extra-ldflags="-Wl,--fix-cortex-a8" \
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  CPU=armv7-a
  
  PREFIX=$(pwd)/android/$CPU
  
  build_on