Restore the possibility to link liba52 instead of dlopening.

Originally committed as revision 7945 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -78,6 +78,7 @@ show_help(){
   echo "  --enable-x11grab         enable X11 grabbing [default=no]"
   echo "  --enable-dc1394          enable IIDC-1394 grabbing using libdc1394"
   echo "                           and libraw1394 [default=no]"
+  echo "  --enable-a52             enable GPLed liba52 support [default=no]"
   echo "  --enable-a52bin          open liba52.so.0 at runtime [default=no]"
   echo "  --enable-avisynth        allow reading AVISynth script files [default=no]"
   echo "  --enable-dts             enable GPLed libdts support [default=no]"
@@ -486,6 +487,7 @@ CONFIG_LIST='
     gpl
     gprof
     ipv6
+    liba52
     liba52bin
     libdts
     libfaac
@@ -595,7 +597,7 @@ amr_wb_decoder_deps="amr_wb"
 amr_wb_encoder_deps="amr_wb"
 dts_decoder_deps="libdts"
 faac_encoder_deps="libfaac"
-liba52_decoder_deps="liba52bin"
+liba52_decoder_deps="liba52"
 libgsm_decoder_deps="libgsm"
 libgsm_encoder_deps="libgsm"
 libtheora_encoder_deps="libtheora"
@@ -754,6 +756,7 @@ avisynth="no"
 dc1394="no"
 dlfcn_h="no"
 dlopen="no"
+liba52="no"
 liba52bin="no"
 libdts="no"
 libfaac="no"
@@ -1032,6 +1035,8 @@ for opt do
   ;;
   --disable-v4l2) video4linux2="no"
   ;;
+  --enable-a52) liba52="yes"
+  ;;
   --enable-a52bin) liba52bin="yes"
   ;;
   --enable-dts) libdts="yes"
@@ -1182,7 +1187,7 @@ if disabled gpl ; then
         enabled_any $@ && die "$name is under GPL and --enable-gpl is not specified."
     }
     die_gpl_disabled "The Postprocessing code" pp
-    die_gpl_disabled "liba52"                  liba52bin
+    die_gpl_disabled "liba52"                  liba52
     die_gpl_disabled "libxvidcore"             xvid
     die_gpl_disabled "x264"                    x264
     die_gpl_disabled "libdts"                  libdts
@@ -1494,6 +1499,7 @@ enabled_all amr_nb amr_nb_fixed &&
     die "Only one of amr_nb and amr_nb_fixed may be enabled."
 
 # these are off by default, so fail if requested and not available
+enabled liba52     && require liba52 a52dec/a52.h a52_init -la52
 enabled libdts     && require libdts dts.h dts_init -ldts -lm
 enabled libgsm     && require libgsm gsm.h gsm_create -lgsm
 enabled libmp3lame && require LAME lame/lame.h lame_init -lmp3lame -lm
@@ -1815,6 +1821,7 @@ if enabled sdl_too_old; then
 fi
 echo "Sun medialib support      $mlib"
 echo "AVISynth enabled          $avisynth"
+echo "liba52 support            $liba52"
 echo "liba52 dlopened           $liba52bin"
 echo "libdts support            $libdts"
 echo "libfaac enabled           $libfaac"

libavcodec/Makefile

@@ -248,7 +248,7 @@ OBJS-$(CONFIG_ADPCM_YAMAHA_DECODER)    += adpcm.o
 OBJS-$(CONFIG_ADPCM_YAMAHA_ENCODER)    += adpcm.o
 
 # external codec libraries
-OBJS-$(CONFIG_LIBA52BIN)               += a52dec.o
+OBJS-$(CONFIG_LIBA52)                  += a52dec.o
 OBJS-$(CONFIG_LIBDTS)                  += dtsdec.o
 OBJS-$(CONFIG_LIBFAAC)                 += faac.o
 OBJS-$(CONFIG_LIBFAAD)                 += faad.o

libavcodec/a52dec.c

@@ -26,8 +26,11 @@
 
 #include "avcodec.h"
 #include <a52dec/a52.h>
+
+#ifdef CONFIG_LIBA52BIN
 #include <dlfcn.h>
 static const char* liba52name = "liba52.so.0";
+#endif
 
 /**
  * liba52 - Copyright (C) Aaron Holtzman
@@ -79,6 +82,7 @@ static int a52_decode_init(AVCodecContext *avctx)
 {
     AC3DecodeState *s = avctx->priv_data;
 
+#ifdef CONFIG_LIBA52BIN
     s->handle = dlopen(liba52name, RTLD_LAZY);
     if (!s->handle)
     {
@@ -97,6 +101,15 @@ static int a52_decode_init(AVCodecContext *avctx)
         dlclose(s->handle);
         return -1;
     }
+#else
+    s->handle = 0;
+    s->a52_init = a52_init;
+    s->a52_samples = a52_samples;
+    s->a52_syncinfo = a52_syncinfo;
+    s->a52_frame = a52_frame;
+    s->a52_block = a52_block;
+    s->a52_free = a52_free;
+#endif
     s->state = s->a52_init(0); /* later use CPU flags */
     s->samples = s->a52_samples(s->state);
     s->inbuf_ptr = s->inbuf;
@@ -226,7 +239,9 @@ static int a52_decode_end(AVCodecContext *avctx)
 {
     AC3DecodeState *s = avctx->priv_data;
     s->a52_free(s->state);
+#ifdef CONFIG_LIBA52BIN
     dlclose(s->handle);
+#endif
     return 0;
 }