Enable swscale usage in ffmpeg

Originally committed as revision 5959 to svn://svn.ffmpeg.org/ffmpeg/trunk

Makefile

@@ -11,6 +11,10 @@ CFLAGS=$(OPTFLAGS) -I. -I$(SRC_PATH) -I$(SRC_PATH)/libavutil \
        -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_ISOC9X_SOURCE
 LDFLAGS+= -g
 
+ifeq ($(CONFIG_SWSCALER),yes)
+CFLAGS := -I$(SRC_PATH)/libswscale $(CFLAGS)
+endif
+
 MANPAGES=doc/ffmpeg.1
 PROGS_G+=ffmpeg_g$(EXESUF)
 PROGS+=ffmpeg$(EXESUF)
@@ -58,6 +62,11 @@ SRCS = $(OBJS:.o=.c) $(ASM_OBJS:.o=.s)
 FFLIBDIRS = -L./libavformat -L./libavcodec -L./libavutil
 FFLIBS = -lavformat$(BUILDSUF) -lavcodec$(BUILDSUF) -lavutil$(BUILDSUF)
 
+ifeq ($(CONFIG_SWSCALER),yes)
+FFLIBDIRS+=-L./libswscale
+FFLIBS+=-lswscale$(BUILDSUF)
+endif
+
 all: version.h lib $(PROGS_G) $(PROGS) $(PROGTEST) $(VHOOK) $(QTFASTSTART) $(DOC)
 
 lib:
@@ -67,6 +76,9 @@ lib:
 ifeq ($(CONFIG_PP),yes)
 	$(MAKE) -C libpostproc all
 endif
+ifeq ($(CONFIG_SWSCALER),yes)
+	$(MAKE) -C libswscale  all
+endif
 
 ffmpeg_g$(EXESUF): ffmpeg.o cmdutils.o .libs
 	$(CC) $(FFLIBDIRS) $(LDFLAGS) -o $@ ffmpeg.o cmdutils.o $(FFLIBS) $(EXTRALIBS)
@@ -141,6 +153,10 @@ install-libs:
 ifeq ($(CONFIG_PP),yes)
 	$(MAKE) -C libpostproc install-libs
 endif
+ifeq ($(CONFIG_SWSCALER),yes)
+	$(MAKE) -C libswscale  install-libs
+endif
+
 ifeq ($(BUILD_SHARED),yes)
 	-$(LDCONFIG)
 endif
@@ -152,6 +168,9 @@ install-headers:
 ifeq ($(CONFIG_PP),yes)
 	$(MAKE) -C libpostproc install-headers
 endif
+ifeq ($(CONFIG_SWSCALER),yes)
+	$(MAKE) -C libswscale  install-headers
+endif
 
 uninstall: uninstall-progs uninstall-libs uninstall-headers uninstall-man uninstall-vhook
 
@@ -202,6 +221,7 @@ clean:
 	$(MAKE) -C libavcodec  clean
 	$(MAKE) -C libavformat clean
 	$(MAKE) -C libpostproc clean
+	$(MAKE) -C libswscale  clean
 	$(MAKE) -C tests       clean
 	$(MAKE) -C vhook       clean
 	$(MAKE) -C doc         clean
@@ -214,6 +234,7 @@ distclean: clean
 	$(MAKE) -C libavcodec  distclean
 	$(MAKE) -C libavformat distclean
 	$(MAKE) -C libpostproc distclean
+	$(MAKE) -C libswscale  distclean
 	$(MAKE) -C tests       distclean
 	$(MAKE) -C vhook       distclean
 	rm -f .depend version.h config.* *.pc

configure

@@ -57,6 +57,7 @@ show_help(){
   echo "  --enable-pthreads        use pthreads [default=no]"
   echo "  --enable-dc1394          enable IIDC-1394 grabbing using libdc1394"
   echo "                           and libraw1394 [default=no]"
+  echo "  --enable-swscaler        software scaler support [default=no]"
   echo "  --enable-gpl             allow use of GPL code, the resulting libav*"
   echo "                           and ffmpeg will be under GPL [default=no]"
   echo ""
@@ -464,6 +465,7 @@ amr_nb_fixed="no"
 amr_if2="no"
 sunmlib="no"
 pthreads="no"
+swscaler="no"
 gpl="no"
 memalignhack="no"
 
@@ -802,6 +804,8 @@ for opt do
   ;;
   --enable-pthreads) pthreads="yes"
   ;;
+  --enable-swscaler) swscaler="yes"
+  ;;
   --enable-gpl) gpl="yes"
   ;;
   --enable-memalign-hack) memalignhack="yes"
@@ -963,6 +967,10 @@ EOF
         fi
     fi
 
+    if test "$swscaler" != "no"; then
+        echo "The software scaler is under GPL and --enable-gpl is not specified."
+        fail="yes"
+    fi
 
     if test "$fail" = "yes"; then
         exit 1
@@ -1501,6 +1509,7 @@ echo "a52 support      $a52"
 echo "a52 dlopened     $a52bin"
 echo "DTS support      $dts"
 echo "pp support       $pp"
+echo "Software Scaler enabled $swscaler"
 echo "debug symbols    $debug"
 echo "strip symbols    $dostrip"
 echo "optimize         $optimize"
@@ -1718,6 +1727,7 @@ if test "$vhook" = "yes" ; then
   echo "#define HAVE_VHOOK 1" >> $TMPH
 fi
 
+sws_version=`grep '#define LIBSWSCALE_VERSION ' "$source_path/libswscale/swscale.h" | sed 's/[^0-9\.]//g'`
 pp_version=`grep '#define LIBPOSTPROC_VERSION ' "$source_path/libpostproc/postprocess.h" | sed 's/[^0-9\.]//g'`
 lavc_version=`grep '#define LIBAVCODEC_VERSION ' "$source_path/libavcodec/avcodec.h" | sed 's/[^0-9\.]//g'`
 lavf_version=`grep '#define LIBAVFORMAT_VERSION ' "$source_path/libavformat/avformat.h" | sed 's/[^0-9\.]//g'`
@@ -1737,6 +1747,8 @@ if test "$lshared" = "yes" ; then
   echo "LAVFVERSION=$lavf_version" >> config.mak
   echo "LAVUMAJOR=${lavu_version%%.*}" >> config.mak
   echo "LAVUVERSION=$lavu_version" >> config.mak
+  echo "SWSMAJOR=${sws_version%%.*}" >> config.mak
+  echo "SWSVERSION=$sws_version" >> config.mak
   echo "SLIBNAME=${SLIBNAME}" >> config.mak
   echo "SLIBNAME_WITH_VERSION=${SLIBNAME_WITH_VERSION}" >> config.mak
   echo "SLIBNAME_WITH_MAJOR=${SLIBNAME_WITH_MAJOR}" >> config.mak
@@ -1791,6 +1803,11 @@ if test "$pp" = "yes" ; then
   echo "CONFIG_PP=yes" >> config.mak
 fi
 
+if test "$swscaler" = "yes" ; then
+  echo "#define CONFIG_SWSCALER 1" >> $TMPH
+  echo "CONFIG_SWSCALER=yes" >> config.mak
+fi
+
 # MPEG audio high precision mode
 if test "$mpegaudio_hp" = "yes" ; then
   echo "#define CONFIG_MPEGAUDIO_HP 1" >> $TMPH
@@ -2011,6 +2028,7 @@ if test "$source_path_used" = "yes" ; then
          libavcodec/liba52 \
          libpostproc \
          libavutil \
+         libswscale \
          tests \
          vhook \
          "
@@ -2020,6 +2038,7 @@ if test "$source_path_used" = "yes" ; then
           libavcodec/Makefile \
           libpostproc/Makefile \
           libavutil/Makefile \
+          libswscale/Makefile \
           tests/Makefile \
           vhook/Makefile \
           doc/Makefile \
@@ -2219,3 +2238,34 @@ Conflicts:
 Libs: \${libdir}/${LIBPREF}postproc${LIBSUF}
 Cflags: -I\${includedir}
 EOF
+
+# libswscale.pc
+cat <<EOF >libswscale.pc
+prefix=$PREFIX
+exec_prefix=\${prefix}
+libdir=\${exec_prefix}/lib
+includedir=\${prefix}/include
+
+Name: libswscale
+Description: FFmpeg image rescaling library
+Version: $sws_version
+Requires: $pkg_requires libavutil = $lavu_version
+Conflicts:
+Libs: -L\${libdir} -lswscale
+Cflags: -I\${includedir} -I\${includedir}/swscale
+EOF
+
+cat <<EOF >libswscale-uninstalled.pc
+prefix=
+exec_prefix=
+libdir=\${pcfiledir}/libswscale
+includedir=\${pcfiledir}/libswscale
+
+Name: libswscale
+Description: FFmpeg image rescaling library
+Version: $sws_version
+Requires: $pkg_requires libavutil = $lavu_version
+Conflicts:
+Libs: \${libdir}/${LIBPREF}swscale${LIBSUF}
+Cflags: -I\${includedir}
+EOF

libavcodec/Makefile

@@ -11,7 +11,7 @@ CFLAGS=$(OPTFLAGS) -DHAVE_AV_CONFIG_H -I.. -I$(SRC_PATH)/libavutil \
 OBJS= bitstream.o utils.o allcodecs.o \
       mpegvideo.o jrevdct.o jfdctfst.o jfdctint.o\
       mjpeg.o resample.o resample2.o dsputil.o \
-      motion_est.o imgconvert.o imgresample.o \
+      motion_est.o imgconvert.o \
       mpeg12.o mpegaudiodec.o simple_idct.o \
       ratecontrol.o eval.o error_resilience.o \
       fft.o mdct.o raw.o golomb.o cabac.o\
@@ -22,6 +22,9 @@ OBJS= bitstream.o utils.o allcodecs.o \
 
 
 HEADERS = avcodec.h
+ifneq ($(CONFIG_SWSCALER),yes)
+HEADERS += swscale.h
+endif
 
 OBJS-$(CONFIG_AASC_DECODER)            += aasc.o
 OBJS-$(CONFIG_AC3_ENCODER)             += ac3enc.o
@@ -277,6 +280,10 @@ OBJS-$(HAVE_BEOSTHREADS)               += beosthread.o
 
 OBJS-$(HAVE_XVMC_ACCEL)                += xvmcvideo.o
 
+ifneq ($(CONFIG_SWSCALER),yes)
+OBJS += imgresample.o
+endif
+
 # i386 mmx specific stuff
 ifeq ($(TARGET_MMX),yes)
 OBJS += i386/fdct_mmx.o i386/cputest.o \

libavcodec/imgconvert.c

@@ -2048,6 +2048,7 @@ int img_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix
     return 0;
 }
 
+#ifndef CONFIG_SWSCALER
 /* XXX: always use linesize. Return -1 if not supported */
 int img_convert(AVPicture *dst, int dst_pix_fmt,
                 const AVPicture *src, int src_pix_fmt,
@@ -2289,6 +2290,7 @@ int img_convert(AVPicture *dst, int dst_pix_fmt,
     avpicture_free(tmp);
     return ret;
 }
+#endif
 
 /* NOTE: we scan all the pixels to have an exact information */
 static int get_alpha_info_pal8(const AVPicture *src, int width, int height)