From ed4e70fae8b1afb7d3c63163996d9ffe0ebf8569 Mon Sep 17 00:00:00 2001
From: Amar Takhar <verm@aegisub.org>
Date: Mon, 3 Mar 2008 08:57:08 +0000
Subject: [PATCH] Add preliminary support for the swscale library if swscale is
 not included in ffmpeg, there are some linux distro's running ancient
 versions still.

Originally committed to SVN as r1872.
---
 aegisub/Makefile.am |  2 +-
 configure.in        | 17 ++++++++++++++---
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/aegisub/Makefile.am b/aegisub/Makefile.am
index 18330264e..7008d3a61 100644
--- a/aegisub/Makefile.am
+++ b/aegisub/Makefile.am
@@ -37,7 +37,7 @@ if HAVE_FFMPEG
 noinst_LIBRARIES += libaudiovideo_ffmpeg.a
 libaudiovideo_ffmpeg_a_SOURCES = audio_provider_lavc.cpp lavc_file.cpp video_provider_lavc.cpp lavc_keyframes.cpp
 libaudiovideo_ffmpeg_a_CFLAGS = @AVFORMAT_CFLAGS @AVCODEC_CFLAGS@
-aegisub_LDFLAGS += @AVFORMAT_LDFLAGS@ @AVCODEC_LDFLAGS@
+aegisub_LDFLAGS += @AVFORMAT_LDFLAGS@ @AVCODEC_LDFLAGS@ @SWSCALE_LDFLAGS@
 endif
 
 if HAVE_LIBASS
diff --git a/configure.in b/configure.in
index aca1d0fb5..a62c4e207 100644
--- a/configure.in
+++ b/configure.in
@@ -164,16 +164,27 @@ AC_ARG_WITH(ffmpeg, [  --without-ffmpeg        build without FFMPEG video provid
 if test "$without_ffmpeg" != xno; then
 
   AC_CHECK_LIB([avcodec], [avcodec_init],AVCODEC_LDFLAGS="-lavcodec", [with_ffmpeg=no])
- 
   AC_CHECK_LIB([avformat], [av_read_frame],AVFORMAT_LDFLAGS="-lavcodec", [with_ffmpeg=no])
+  AC_CHECK_LIB([avformat], [sws_scale],[with_swscale="yes"], [with_swscale="no"])
 
-  AC_CHECK_LIB([avformat], [sws_scale],MOSTLY_HARMLESS=, [with_ffmpeg=no])
-  if test "$with_ffmpeg" != "no"; then
+  if test "$with_swscale" = "no"; then
+    AC_CHECK_LIB([swscale], [sws_scale],[SWSCALE_LDFLAGS="-lswscale"; with_swscale_lib="yes"], [with_swscale_lib="no"])
+  fi
+
+  if test "$with_swscale" = "yes" || test "$with_swscale_lib" = "yes"; then
+    with_ffmpeg="yes";
+  else 
+    with_ffmpeg="no";
+  fi
+
+  if test "$with_ffmpeg" = "yes"; then
     found_video_provider=yes
     with_ffmpeg="yes"
     AC_DEFINE(WITH_FFMPEG, 1, [Enable FFMPEG Video Provider])
   fi
 fi
+
+AC_SUBST(SWSCALE_LDFLAGS)
 AC_SUBST(AVCODEC_LDFLAGS)
 AC_SUBST(AVFORMAT_LDFLAGS)
 AM_CONDITIONAL([HAVE_FFMPEG], [test "$with_ffmpeg" != "no"])