Add libavresample support. Tested on windows x64 only.

.travis.yml

@@ -12,7 +12,7 @@ before_install:
  - sudo apt-get update -qq
  - sudo apt-get install -qq libgtest-dev google-mock
  - sudo apt-get install -qq libboost-filesystem-dev libboost-program-options-dev libboost-system-dev libboost-thread-dev libboost-wave-dev
- - sudo apt-get install -qq libavcodec-dev libavformat-dev libavutil-dev libswscale-dev
+ - sudo apt-get install -qq libavcodec-dev libavformat-dev libavutil-dev libswscale-dev libavresample-dev
  - sudo apt-get install -qq libbullet-dev libogre-1.9-dev libmygui-dev libsdl2-dev libunshield-dev libtinyxml-dev libopenal-dev libqt4-dev
  - sudo mkdir /usr/src/gtest/build
  - cd /usr/src/gtest/build

CMakeLists.txt

@@ -139,10 +139,23 @@ set(OPENMW_LIBS ${OENGINE_ALL})
 set(OPENMW_LIBS_HEADER)
 
 # Sound setup
-set(FFmpeg_FIND_COMPONENTS AVCODEC AVFORMAT AVUTIL SWSCALE SWRESAMPLE)
-find_package(FFmpeg REQUIRED)
+set(FFmpeg_FIND_COMPONENTS AVCODEC AVFORMAT AVUTIL SWSCALE SWRESAMPLE AVRESAMPLE)
+find_package(FFmpeg)
+if ( NOT AVCODEC_FOUND OR NOT AVFORMAT_FOUND OR NOT AVUTIL_FOUND OR NOT SWSCALE_FOUND )
+    message(FATAL_ERROR "FFmpeg component required, but not found!")
+endif()
 set(SOUND_INPUT_INCLUDES ${FFMPEG_INCLUDE_DIRS})
-set(SOUND_INPUT_LIBRARY ${FFMPEG_LIBRARIES} ${SWSCALE_LIBRARIES} ${SWRESAMPLE_LIBRARIES})
+set(SOUND_INPUT_LIBRARY ${FFMPEG_LIBRARIES} ${SWSCALE_LIBRARIES})
+if( SWRESAMPLE_FOUND )
+    add_definitions(-DHAVE_LIBSWRESAMPLE)
+    set(SOUND_INPUT_LIBRARY ${FFMPEG_LIBRARIES} ${SWRESAMPLE_LIBRARIES})
+else()
+    if( AVRESAMPLE_FOUND)
+        set(SOUND_INPUT_LIBRARY ${FFMPEG_LIBRARIES} ${AVRESAMPLE_LIBRARIES})
+    else()
+        message(FATAL_ERROR "FFmpeg component required, but not found!")
+    endif()
+endif()
 
 # TinyXML
 option(USE_SYSTEM_TINYXML "Use system TinyXML library instead of internal." OFF)

apps/openmw/mwrender/videoplayer.cpp

@@ -52,11 +52,69 @@ extern "C"
         #include <libavutil/channel_layout.h>
     #endif
 
+    // WARNING: avcodec versions up to 54.54.100 potentially crashes on Windows 64bit.
+}
+
 // From version 54.56 binkaudio encoding format changed from S16 to FLTP. See:
 // https://gitorious.org/ffmpeg/ffmpeg/commit/7bfd1766d1c18f07b0a2dd042418a874d49ea60d
 // http://ffmpeg.zeranoe.com/forum/viewtopic.php?f=15&t=872
-    // WARNING: avcodec versions up to 54.54.100 potentially crashes on Windows 64bit.
+extern "C" {
+#ifdef HAVE_LIBSWRESAMPLE
 #include <libswresample/swresample.h>
+#else
+/* nasty hack for systems without libswresample */
+#include <libavresample/avresample.h>
+#include <libavutil/opt.h>
+
+int swr_convert(
+        AVAudioResampleContext *avr,
+        uint8_t** output,
+        int out_samples,
+        const uint8_t** input,
+        int in_samples)
+{
+    // FIXME: potential performance hit
+    int out_plane_size = 0;
+    int in_plane_size = 0;
+    return avresample_convert(avr, output, out_plane_size, out_samples,
+                              (uint8_t **)input, in_plane_size, in_samples);
+}
+
+AVAudioResampleContext * swr_alloc_set_opts(
+        AVAudioResampleContext *avr,
+        int64_t out_ch_layout,
+        AVSampleFormat out_fmt,
+        int out_rate,
+        int64_t in_ch_layout,
+        AVSampleFormat in_fmt,
+        int in_rate,
+        int o,
+        void* l)
+{
+    avr = avresample_alloc_context();
+    if(!avr)
+        return 0;
+
+    if ((av_opt_set_int(avr, "out_channel_layout", out_ch_layout, 0) < 0) ||
+        (av_opt_set_int(avr, "out_sample_fmt",     out_fmt,       0) < 0) ||
+        (av_opt_set_int(avr, "out_sample_rate",    out_rate,      0) < 0) ||
+        (av_opt_set_int(avr, "in_channel_layout",  in_ch_layout,  0) < 0) ||
+        (av_opt_set_int(avr, "in_sample_fmt",      in_fmt,        0) < 0) ||
+        (av_opt_set_int(avr, "in_sample_rate",     in_rate,       0) < 0))
+    {
+        return 0;
+    }
+
+    if(avresample_open(avr) < 0)
+        return 0;
+    else
+        return avr;
+}
+
+void  swr_free(AVAudioResampleContext **avr) { avresample_free(avr); }
+int  swr_init(AVAudioResampleContext *avr) { return 1; }
+#define SwrContext AVAudioResampleContext
+#endif
 }
 
 #define MAX_AUDIOQ_SIZE (5 * 16 * 1024)

cmake/FindFFmpeg.cmake

@@ -114,6 +114,7 @@ if (NOT FFMPEG_LIBRARIES)
   find_component(SWSCALE  libswscale  swscale  libswscale/swscale.h)
   find_component(POSTPROC libpostproc postproc libpostproc/postprocess.h)
   find_component(SWRESAMPLE  libswresample  swresample  libswresample/swresample.h)
+  find_component(AVRESAMPLE  libavresample  avresample  libavresample/avresample.h)
 
   # Check if the required components were found and add their stuff to the FFMPEG_* vars.
   foreach (_component ${FFmpeg_FIND_COMPONENTS})
@@ -144,7 +145,7 @@ if (NOT FFMPEG_LIBRARIES)
 endif ()
 
 # Now set the noncached _FOUND vars for the components.
-foreach (_component AVCODEC AVDEVICE AVFORMAT AVUTIL POSTPROCESS SWSCALE SWRESAMPLE)
+foreach (_component AVCODEC AVDEVICE AVFORMAT AVUTIL POSTPROCESS SWSCALE SWRESAMPLE AVRESAMPLE)
   set_component_found(${_component})
 endforeach ()